Release 4.10 drivers/block/rbd.c

Directory: drivers/block
/*
   rbd.c -- Export ceph rados objects as a Linux block device


   based on drivers/block/osdblk.c:

   Copyright 2009 Red Hat, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.



   For usage instructions, please refer to:

                 Documentation/ABI/testing/sysfs-bus-rbd

 */

#include <linux/ceph/libceph.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/mon_client.h>
#include <linux/ceph/cls_lock_client.h>
#include <linux/ceph/decode.h>
#include <linux/parser.h>
#include <linux/bsearch.h>

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/blk-mq.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/workqueue.h>

#include "rbd_types.h"


#define RBD_DEBUG	
/* Activate rbd_assert() calls */

/*
 * The basic unit of block I/O is a sector.  It is interpreted in a
 * number of contexts in Linux (blk, bio, genhd), but the default is
 * universally 512 bytes.  These symbols are just slightly more
 * meaningful than the bare numbers they represent.
 */

#define	SECTOR_SHIFT	9

#define	SECTOR_SIZE	(1ULL << SECTOR_SHIFT)

/*
 * Increment the given counter and return its updated value.
 * If the counter is already 0 it will not be incremented.
 * If the counter is already at its maximum value returns
 * -EINVAL without updating it.
 */


static int atomic_inc_return_safe(atomic_t *v)
{
	unsigned int counter;

	counter = (unsigned int)__atomic_add_unless(v, 1, 0);
	if (counter <= (unsigned int)INT_MAX)
		return (int)counter;

	atomic_dec(v);

	return -EINVAL;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%

/* Decrement the counter.  Return the resulting value, or -EINVAL */


static int atomic_dec_return_safe(atomic_t *v)
{
	int counter;

	counter = atomic_dec_return(v);
	if (counter >= 0)
		return counter;

	atomic_inc(v);

	return -EINVAL;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


#define RBD_DRV_NAME "rbd"


#define RBD_MINORS_PER_MAJOR		256

#define RBD_SINGLE_MAJOR_PART_SHIFT	4


#define RBD_MAX_PARENT_CHAIN_LEN	16


#define RBD_SNAP_DEV_NAME_PREFIX	"snap_"

#define RBD_MAX_SNAP_NAME_LEN	\
			(NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))


#define RBD_MAX_SNAP_COUNT	510	
/* allows max snapc to fit in 4KB */


#define RBD_SNAP_HEAD_NAME	"-"


#define	BAD_SNAP_INDEX	U32_MAX		
/* invalid index into snap array */

/* This allows a single page to hold an image name sent by OSD */

#define RBD_IMAGE_NAME_LEN_MAX	(PAGE_SIZE - sizeof (__le32) - 1)

#define RBD_IMAGE_ID_LEN_MAX	64


#define RBD_OBJ_PREFIX_LEN_MAX	64


#define RBD_NOTIFY_TIMEOUT	5	
/* seconds */

#define RBD_RETRY_DELAY		msecs_to_jiffies(1000)

/* Feature bits */


#define RBD_FEATURE_LAYERING	(1<<0)

#define RBD_FEATURE_STRIPINGV2	(1<<1)

#define RBD_FEATURE_EXCLUSIVE_LOCK (1<<2)

#define RBD_FEATURES_ALL	(RBD_FEATURE_LAYERING |         \
                                 RBD_FEATURE_STRIPINGV2 |       \
                                 RBD_FEATURE_EXCLUSIVE_LOCK)

/* Features supported by this (client software) implementation. */


#define RBD_FEATURES_SUPPORTED	(RBD_FEATURES_ALL)

/*
 * An RBD device name will be "rbd#", where the "rbd" comes from
 * RBD_DRV_NAME above, and # is a unique integer identifier.
 */

#define DEV_NAME_LEN		32

/*
 * block device image metadata (in-memory version)
 */

struct rbd_image_header {
	/* These six fields never change for a given rbd image */
	
char *object_prefix;
	
__u8 obj_order;
	
__u8 crypt_type;
	
__u8 comp_type;
	
u64 stripe_unit;
	
u64 stripe_count;
	
u64 features;		/* Might be changeable someday? */

	/* The remaining fields need to be updated occasionally */
	
u64 image_size;
	
struct ceph_snap_context *snapc;
	
char *snap_names;	/* format 1 only */
	
u64 *snap_sizes;	/* format 1 only */
};

/*
 * An rbd image specification.
 *
 * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
 * identify an image.  Each rbd_dev structure includes a pointer to
 * an rbd_spec structure that encapsulates this identity.
 *
 * Each of the id's in an rbd_spec has an associated name.  For a
 * user-mapped image, the names are supplied and the id's associated
 * with them are looked up.  For a layered image, a parent image is
 * defined by the tuple, and the names are looked up.
 *
 * An rbd_dev structure contains a parent_spec pointer which is
 * non-null if the image it represents is a child in a layered
 * image.  This pointer will refer to the rbd_spec structure used
 * by the parent rbd_dev for its own identity (i.e., the structure
 * is shared between the parent and child).
 *
 * Since these structures are populated once, during the discovery
 * phase of image construction, they are effectively immutable so
 * we make no effort to synchronize access to them.
 *
 * Note that code herein does not assume the image name is known (it
 * could be a null pointer).
 */

struct rbd_spec {
	
u64		pool_id;
	
const char	*pool_name;

	
const char	*image_id;
	
const char	*image_name;

	
u64		snap_id;
	
const char	*snap_name;

	
struct kref	kref;
};

/*
 * an instance of the client.  multiple devices may share an rbd client.
 */

struct rbd_client {
	
struct ceph_client	*client;
	
struct kref		kref;
	
struct list_head	node;
};

struct rbd_img_request;

typedef void (*rbd_img_callback_t)(struct rbd_img_request *);


#define	BAD_WHICH	U32_MAX		
/* Good which or bad which, which? */

struct rbd_obj_request;

typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *);


enum obj_request_type {
	


OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES
};


enum obj_operation_type {
	
OBJ_OP_WRITE,
	
OBJ_OP_READ,
	
OBJ_OP_DISCARD,
};


enum obj_req_flags {
	
OBJ_REQ_DONE,		/* completion flag: not done = 0, done = 1 */
	
OBJ_REQ_IMG_DATA,	/* object usage: standalone = 0, image = 1 */
	
OBJ_REQ_KNOWN,		/* EXISTS flag valid: no = 0, yes = 1 */
	
OBJ_REQ_EXISTS,		/* target exists: no = 0, yes = 1 */
};


struct rbd_obj_request {
	
const char		*object_name;
	
u64			offset;		/* object start byte */
	
u64			length;		/* bytes from offset */
	
unsigned long		flags;

	/*
         * An object request associated with an image will have its
         * img_data flag set; a standalone object request will not.
         *
         * A standalone object request will have which == BAD_WHICH
         * and a null obj_request pointer.
         *
         * An object request initiated in support of a layered image
         * object (to check for its existence before a write) will
         * have which == BAD_WHICH and a non-null obj_request pointer.
         *
         * Finally, an object request for rbd image data will have
         * which != BAD_WHICH, and will have a non-null img_request
         * pointer.  The value of which will be in the range
         * 0..(img_request->obj_request_count-1).
         */
	union {
		
struct rbd_obj_request	*obj_request;	/* STAT op */
		struct {
			
struct rbd_img_request	*img_request;
			
u64			img_offset;
			/* links for img_request->obj_requests list */
			
struct list_head	links;
		};
	};
	
u32			which;		/* posn image request list */

	
enum obj_request_type	type;
	union {
		
struct bio	*bio_list;
		struct {
			
struct page	**pages;
			
u32		page_count;
		};
	};
	
struct page		**copyup_pages;
	
u32			copyup_page_count;

	
struct ceph_osd_request	*osd_req;

	
u64			xferred;	/* bytes transferred */
	
int			result;

	
rbd_obj_callback_t	callback;
	
struct completion	completion;

	
struct kref		kref;
};


enum img_req_flags {
	
IMG_REQ_WRITE,		/* I/O direction: read = 0, write = 1 */
	
IMG_REQ_CHILD,		/* initiator: block = 0, child image = 1 */
	
IMG_REQ_LAYERED,	/* ENOENT handling: normal = 0, layered = 1 */
	
IMG_REQ_DISCARD,	/* discard: normal = 0, discard request = 1 */
};


struct rbd_img_request {
	
struct rbd_device	*rbd_dev;
	
u64			offset;	/* starting image byte offset */
	
u64			length;	/* byte count from offset */
	
unsigned long		flags;
	union {
		
u64			snap_id;	/* for reads */
		
struct ceph_snap_context *snapc;	/* for writes */
	};
	union {
		
struct request		*rq;		/* block request */
		
struct rbd_obj_request	*obj_request;	/* obj req initiator */
	};
	
struct page		**copyup_pages;
	
u32			copyup_page_count;
	
spinlock_t		completion_lock;/* protects next_completion */
	
u32			next_completion;
	
rbd_img_callback_t	callback;
	
u64			xferred;/* aggregate bytes transferred */
	
int			result;	/* first nonzero obj_request result */

	
u32			obj_request_count;
	
struct list_head	obj_requests;	/* rbd_obj_request structs */

	
struct kref		kref;
};


#define for_each_obj_request(ireq, oreq) \
	list_for_each_entry(oreq, &(ireq)->obj_requests, links)

#define for_each_obj_request_from(ireq, oreq) \
	list_for_each_entry_from(oreq, &(ireq)->obj_requests, links)

#define for_each_obj_request_safe(ireq, oreq, n) \
	list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)


enum rbd_watch_state {
	
RBD_WATCH_STATE_UNREGISTERED,
	
RBD_WATCH_STATE_REGISTERED,
	
RBD_WATCH_STATE_ERROR,
};


enum rbd_lock_state {
	
RBD_LOCK_STATE_UNLOCKED,
	
RBD_LOCK_STATE_LOCKED,
	
RBD_LOCK_STATE_RELEASING,
};

/* WatchNotify::ClientId */

struct rbd_client_id {
	
u64 gid;
	
u64 handle;
};


struct rbd_mapping {
	
u64                     size;
	
u64                     features;
	
bool			read_only;
};

/*
 * a single device
 */

struct rbd_device {
	
int			dev_id;		/* blkdev unique id */

	
int			major;		/* blkdev assigned major */
	
int			minor;
	
struct gendisk		*disk;		/* blkdev's gendisk and rq */

	
u32			image_format;	/* Either 1 or 2 */
	
struct rbd_client	*rbd_client;

	
char			name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */

	
spinlock_t		lock;		/* queue, flags, open_count */

	
struct rbd_image_header	header;
	
unsigned long		flags;		/* possibly lock protected */
	
struct rbd_spec		*spec;
	
struct rbd_options	*opts;
	
char			*config_info;	/* add{,_single_major} string */

	
struct ceph_object_id	header_oid;
	
struct ceph_object_locator header_oloc;

	
struct ceph_file_layout	layout;		/* used for all rbd requests */

	
struct mutex		watch_mutex;
	
enum rbd_watch_state	watch_state;
	
struct ceph_osd_linger_request *watch_handle;
	
u64			watch_cookie;
	
struct delayed_work	watch_dwork;

	
struct rw_semaphore	lock_rwsem;
	
enum rbd_lock_state	lock_state;
	
struct rbd_client_id	owner_cid;
	
struct work_struct	acquired_lock_work;
	
struct work_struct	released_lock_work;
	
struct delayed_work	lock_dwork;
	
struct work_struct	unlock_work;
	
wait_queue_head_t	lock_waitq;

	
struct workqueue_struct	*task_wq;

	
struct rbd_spec		*parent_spec;
	
u64			parent_overlap;
	
atomic_t		parent_ref;
	
struct rbd_device	*parent;

	/* Block layer tags. */
	
struct blk_mq_tag_set	tag_set;

	/* protects updating the header */
	
struct rw_semaphore     header_rwsem;

	
struct rbd_mapping	mapping;

	
struct list_head	node;

	/* sysfs related */
	
struct device		dev;
	
unsigned long		open_count;	/* protected by lock */
};

/*
 * Flag bits for rbd_dev->flags:
 * - REMOVING (which is coupled with rbd_dev->open_count) is protected
 *   by rbd_dev->lock
 * - BLACKLISTED is protected by rbd_dev->lock_rwsem
 */

enum rbd_dev_flags {
	
RBD_DEV_FLAG_EXISTS,	/* mapped snapshot has not been deleted */
	
RBD_DEV_FLAG_REMOVING,	/* this mapping is being removed */
	
RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */
};

static DEFINE_MUTEX(client_mutex);	/* Serialize client creation */

static LIST_HEAD(rbd_dev_list);    /* devices */
static DEFINE_SPINLOCK(rbd_dev_list_lock);

static LIST_HEAD(rbd_client_list);		/* clients */
static DEFINE_SPINLOCK(rbd_client_list_lock);

/* Slab caches for frequently-allocated structures */


static struct kmem_cache	*rbd_img_request_cache;

static struct kmem_cache	*rbd_obj_request_cache;

static struct kmem_cache	*rbd_segment_name_cache;


static int rbd_major;
static DEFINE_IDA(rbd_dev_id_ida);


static struct workqueue_struct *rbd_wq;

/*
 * Default to false for now, as single-major requires >= 0.75 version of
 * userspace rbd utility.
 */

static bool single_major = false;
module_param(single_major, bool, S_IRUGO);
MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)");

static int rbd_img_request_submit(struct rbd_img_request *img_request);

static ssize_t rbd_add(struct bus_type *bus, const char *buf,
		       size_t count);
static ssize_t rbd_remove(struct bus_type *bus, const char *buf,
			  size_t count);
static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf,
				    size_t count);
static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf,
				       size_t count);
static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth);
static void rbd_spec_put(struct rbd_spec *spec);



static int rbd_dev_id_to_minor(int dev_id)
{
	return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 14 100.00% 2 100.00%
Total 14 100.00% 2 100.00%



static int minor_to_rbd_dev_id(int minor)
{
	return minor >> RBD_SINGLE_MAJOR_PART_SHIFT;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 14 100.00% 2 100.00%
Total 14 100.00% 2 100.00%



static bool rbd_is_lock_supported(struct rbd_device *rbd_dev)
{
	return (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) &&
	       rbd_dev->spec->snap_id == CEPH_NOSNAP &&
	       !rbd_dev->mapping.read_only;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev)
{
	return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED ||
	       rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static bool rbd_is_lock_owner(struct rbd_device *rbd_dev)
{
	bool is_lock_owner;

	down_read(&rbd_dev->lock_rwsem);
	is_lock_owner = __rbd_is_lock_owner(rbd_dev);
	up_read(&rbd_dev->lock_rwsem);
	return is_lock_owner;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 40 100.00% 1 100.00%
Total 40 100.00% 1 100.00%

static BUS_ATTR(add, S_IWUSR, NULL, rbd_add);
static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove);
static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major);
static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major);


static struct attribute *rbd_bus_attrs[] = {
	&bus_attr_add.attr,
	&bus_attr_remove.attr,
	&bus_attr_add_single_major.attr,
	&bus_attr_remove_single_major.attr,
	NULL,
};



static umode_t rbd_bus_is_visible(struct kobject *kobj,
				  struct attribute *attr, int index)
{
	if (!single_major &&
	    (attr == &bus_attr_add_single_major.attr ||
	     attr == &bus_attr_remove_single_major.attr))
		return 0;

	return attr->mode;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 48 100.00% 2 100.00%
Total 48 100.00% 2 100.00%


static const struct attribute_group rbd_bus_group = {
	.attrs = rbd_bus_attrs,
	.is_visible = rbd_bus_is_visible,
};

__ATTRIBUTE_GROUPS(rbd_bus);


static struct bus_type rbd_bus_type = {
	.name		= "rbd",
	.bus_groups	= rbd_bus_groups,
};



static void rbd_root_dev_release(struct device *dev)
{
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%


static struct device rbd_root_dev = {
	.init_name =    "rbd",
	.release =      rbd_root_dev_release,
};

static __printf(2, 3)

void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...)
{
        struct va_format vaf;
	va_list args;

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;

	if (!rbd_dev)
		printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf);
	else if (rbd_dev->disk)
		printk(KERN_WARNING "%s: %s: %pV\n",
			RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf);
	else if (rbd_dev->spec && rbd_dev->spec->image_name)
		printk(KERN_WARNING "%s: image %s: %pV\n",
			RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf);
	else if (rbd_dev->spec && rbd_dev->spec->image_id)
		printk(KERN_WARNING "%s: id %s: %pV\n",
			RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf);
	else	/* punt */
		printk(KERN_WARNING "%s: rbd_dev %p: %pV\n",
			RBD_DRV_NAME, rbd_dev, &vaf);
	va_end(args);
}

#ifdef RBD_DEBUG

#define rbd_assert(expr)						\
		if (unlikely(!(expr))) {                                \
                        printk(KERN_ERR "\nAssertion failure in %s() "  \
                                                "at line %d:\n\n"       \
                                        "\trbd_assert(%s);\n\n",        \
                                        __func__, __LINE__, #expr);     \
                        BUG();                                          \
                }
#else /* !RBD_DEBUG */

#  define rbd_assert(expr)	((void) 0)
#endif /* !RBD_DEBUG */

static void rbd_osd_copyup_callback(struct rbd_obj_request *obj_request);
static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request);
static void rbd_img_parent_read(struct rbd_obj_request *obj_request);
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev);

static int rbd_dev_refresh(struct rbd_device *rbd_dev);
static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev);
static int rbd_dev_header_info(struct rbd_device *rbd_dev);
static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev);
static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
					u64 snap_id);
static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
				u8 *order, u64 *snap_size);
static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
		u64 *snap_features);



static int rbd_open(struct block_device *bdev, fmode_t mode)
{
	struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
	bool removing = false;

	if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only)
		return -EROFS;

	spin_lock_irq(&rbd_dev->lock);
	if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags))
		removing = true;
	else
		rbd_dev->open_count++;
	spin_unlock_irq(&rbd_dev->lock);
	if (removing)
		return -ENOENT;

	(void) get_device(&rbd_dev->dev);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 66 61.11% 6 85.71%
yehuda sadeh yehuda sadeh 42 38.89% 1 14.29%
Total 108 100.00% 7 100.00%



static void rbd_release(struct gendisk *disk, fmode_t mode)
{
	struct rbd_device *rbd_dev = disk->private_data;
	unsigned long open_count_before;

	spin_lock_irq(&rbd_dev->lock);
	open_count_before = rbd_dev->open_count--;
	spin_unlock_irq(&rbd_dev->lock);
	rbd_assert(open_count_before > 0);

	put_device(&rbd_dev->dev);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 38 58.46% 4 66.67%
yehuda sadeh yehuda sadeh 26 40.00% 1 16.67%
al viro al viro 1 1.54% 1 16.67%
Total 65 100.00% 6 100.00%



static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg)
{
	int ret = 0;
	int val;
	bool ro;
	bool ro_changed = false;

	/* get_user() may sleep, so call it before taking rbd_dev->lock */
	if (get_user(val, (int __user *)(arg)))
		return -EFAULT;

	ro = val ? true : false;
	/* Snapshot doesn't allow to write*/
	if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro)
		return -EROFS;

	spin_lock_irq(&rbd_dev->lock);
	/* prevent others open this device */
	if (rbd_dev->open_count > 1) {
		ret = -EBUSY;
		goto out;
	}

	if (rbd_dev->mapping.read_only != ro) {
		rbd_dev->mapping.read_only = ro;
		ro_changed = true;
	}

out:
	spin_unlock_irq(&rbd_dev->lock);
	/* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */
	if (ret == 0 && ro_changed)
		set_disk_ro(rbd_dev->disk, ro ? 1 : 0);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
guangliang zhao guangliang zhao 101 61.59% 1 50.00%
josh durgin josh durgin 63 38.41% 1 50.00%
Total 164 100.00% 2 100.00%



static int rbd_ioctl(struct block_device *bdev, fmode_t mode,
			unsigned int cmd, unsigned long arg)
{
	struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
	int ret = 0;

	switch (cmd) {
	case BLKROSET:
		ret = rbd_ioctl_set_ro(rbd_dev, arg);
		break;
	default:
		ret = -ENOTTY;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
guangliang zhao guangliang zhao 66 100.00% 1 100.00%
Total 66 100.00% 1 100.00%

#ifdef CONFIG_COMPAT


static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode,
				unsigned int cmd, unsigned long arg)
{
	return rbd_ioctl(bdev, mode, cmd, arg);
}
Contributors
Person Tokens Prop Commits CommitProp
guangliang zhao guangliang zhao 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%

#endif /* CONFIG_COMPAT */


static const struct block_device_operations rbd_bd_ops = {
	.owner			= THIS_MODULE,
	.open			= rbd_open,
	.release		= rbd_release,
	.ioctl			= rbd_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl		= rbd_compat_ioctl,
#endif
};

/*
 * Initialize an rbd client instance.  Success or not, this function
 * consumes ceph_opts.  Caller holds client_mutex.
 */


static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts)
{
	struct rbd_client *rbdc;
	int ret = -ENOMEM;

	dout("%s:\n", __func__);
	rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL);
	if (!rbdc)
		goto out_opt;

	kref_init(&rbdc->kref);
	INIT_LIST_HEAD(&rbdc->node);

	rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0);
	if (IS_ERR(rbdc->client))
		goto out_rbdc;
	ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */

	ret = ceph_open_session(rbdc->client);
	if (ret < 0)
		goto out_client;

	spin_lock(&rbd_client_list_lock);
	list_add_tail(&rbdc->node, &rbd_client_list);
	spin_unlock(&rbd_client_list_lock);

	dout("%s: rbdc %p\n", __func__, rbdc);

	return rbdc;
out_client:
	ceph_destroy_client(rbdc->client);
out_rbdc:
	kfree(rbdc);
out_opt:
	if (ceph_opts)
		ceph_destroy_options(ceph_opts);
	dout("%s: error %d\n", __func__, ret);

	return ERR_PTR(ret);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 157 80.51% 1 14.29%
alex elder alex elder 27 13.85% 4 57.14%
vasiliy kulikov vasiliy kulikov 7 3.59% 1 14.29%
sage weil sage weil 4 2.05% 1 14.29%
Total 195 100.00% 7 100.00%



static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc)
{
	kref_get(&rbdc->kref);

	return rbdc;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%

/*
 * Find a ceph client with specific addr and configuration.  If
 * found, bump its reference count.
 */


static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts)
{
	struct rbd_client *client_node;
	bool found = false;

	if (ceph_opts->flags & CEPH_OPT_NOSHARE)
		return NULL;

	spin_lock(&rbd_client_list_lock);
	list_for_each_entry(client_node, &rbd_client_list, node) {
		if (!ceph_compare_options(ceph_opts, client_node->client)) {
			__rbd_get_client(client_node);

			found = true;
			break;
		}
	}
	spin_unlock(&rbd_client_list_lock);

	return found ? client_node : NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 48 55.17% 1 25.00%
alex elder alex elder 39 44.83% 3 75.00%
Total 87 100.00% 4 100.00%

/*
 * (Per device) rbd map options
 */
enum {
	
Opt_queue_depth,
	
Opt_last_int,
	/* int args above */
	
Opt_last_string,
	/* string args above */
	
Opt_read_only,
	
Opt_read_write,
	
Opt_lock_on_read,
	
Opt_err
};


static match_table_t rbd_opts_tokens = {
	{Opt_queue_depth, "queue_depth=%d"},
	/* int args above */
	/* string args above */
	{Opt_read_only, "read_only"},
	{Opt_read_only, "ro"},		/* Alternate spelling */
	{Opt_read_write, "read_write"},
	{Opt_read_write, "rw"},		/* Alternate spelling */
	{Opt_lock_on_read, "lock_on_read"},
	{Opt_err, NULL}
};


struct rbd_options {
	
int	queue_depth;
	
bool	read_only;
	
bool	lock_on_read;
};


#define RBD_QUEUE_DEPTH_DEFAULT	BLKDEV_MAX_RQ

#define RBD_READ_ONLY_DEFAULT	false

#define RBD_LOCK_ON_READ_DEFAULT false



static int parse_rbd_opts_token(char *c, void *private)
{
	struct rbd_options *rbd_opts = private;
	substring_t argstr[MAX_OPT_ARGS];
	int token, intval, ret;

	token = match_token(c, rbd_opts_tokens, argstr);
	if (token < Opt_last_int) {
		ret = match_int(&argstr[0], &intval);
		if (ret < 0) {
			pr_err("bad mount option arg (not int) at '%s'\n", c);
			return ret;
		}
		dout("got int token %d val %d\n", token, intval);
	} else if (token > Opt_last_int && token < Opt_last_string) {
		dout("got string token %d val %s\n", token, argstr[0].from);
	} else {
		dout("got token %d\n", token);
	}

	switch (token) {
	case Opt_queue_depth:
		if (intval < 1) {
			pr_err("queue_depth out of range\n");
			return -EINVAL;
		}
		rbd_opts->queue_depth = intval;
		break;
	case Opt_read_only:
		rbd_opts->read_only = true;
		break;
	case Opt_read_write:
		rbd_opts->read_only = false;
		break;
	case Opt_lock_on_read:
		rbd_opts->lock_on_read = true;
		break;
	default:
		/* libceph prints "bad option" msg */
		return -EINVAL;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 139 68.47% 1 16.67%
ilya dryomov ilya dryomov 43 21.18% 3 50.00%
alex elder alex elder 21 10.34% 2 33.33%
Total 203 100.00% 6 100.00%



static char* obj_op_name(enum obj_operation_type op_type)
{
	switch (op_type) {
	case OBJ_OP_READ:
		return "read";
	case OBJ_OP_WRITE:
		return "write";
	case OBJ_OP_DISCARD:
		return "discard";
	default:
		return "???";
	}
}

Contributors
Person Tokens Prop Commits CommitProp
guangliang zhao guangliang zhao 39 100.00% 2 100.00%
Total 39 100.00% 2 100.00%

/*
 * Get a ceph client with specific addr and configuration, if one does
 * not exist create it.  Either way, ceph_opts is consumed by this
 * function.
 */


static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts)
{
	struct rbd_client *rbdc;

	mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING);
	rbdc = rbd_client_find(ceph_opts);
	if (rbdc)	/* using an existing client */
		ceph_destroy_options(ceph_opts);
	else
		rbdc = rbd_client_create(ceph_opts);
	mutex_unlock(&client_mutex);

	return rbdc;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 34 56.67% 8 80.00%
yehuda sadeh yehuda sadeh 26 43.33% 2 20.00%
Total 60 100.00% 10 100.00%

/*
 * Destroy ceph client
 *
 * Caller must hold rbd_client_list_lock.
 */


static void rbd_client_release(struct kref *kref)
{
	struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref);

	dout("%s: rbdc %p\n", __func__, rbdc);
	spin_lock(&rbd_client_list_lock);
	list_del(&rbdc->node);
	spin_unlock(&rbd_client_list_lock);

	ceph_destroy_client(rbdc->client);
	kfree(rbdc);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 52 77.61% 1 33.33%
alex elder alex elder 15 22.39% 2 66.67%
Total 67 100.00% 3 100.00%

/*
 * Drop reference to ceph client node. If it's not referenced anymore, release
 * it.
 */


static void rbd_put_client(struct rbd_client *rbdc)
{
	if (rbdc)
		kref_put(&rbdc->kref, rbd_client_release);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 18 72.00% 1 33.33%
alex elder alex elder 7 28.00% 2 66.67%
Total 25 100.00% 3 100.00%



static bool rbd_image_format_valid(u32 image_format)
{
	return image_format == 1 || image_format == 2;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%



static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk)
{
	size_t size;
	u32 snap_count;

	/* The header has to start with the magic rbd header text */
	if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT)))
		return false;

	/* The bio layer requires at least sector-sized I/O */

	if (ondisk->options.order < SECTOR_SHIFT)
		return false;

	/* If we use u64 in a few spots we may be able to loosen this */

	if (ondisk->options.order > 8 * sizeof (int) - 1)
		return false;

	/*
         * The size of a snapshot header has to fit in a size_t, and
         * that limits the number of snapshots.
         */
	snap_count = le32_to_cpu(ondisk->snap_count);
	size = SIZE_MAX - sizeof (struct ceph_snap_context);
	if (snap_count > size / sizeof (__le64))
		return false;

	/*
         * Not only that, but the size of the entire the snapshot
         * header must also be representable in a size_t.
         */
	size -= snap_count * sizeof (__le64);
	if ((u64) size < le64_to_cpu(ondisk->snap_names_len))
		return false;

	return true;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 137 100.00% 3 100.00%
Total 137 100.00% 3 100.00%

/*
 * Fill an rbd image header with information from the given format 1
 * on-disk header.
 */


static int rbd_header_from_disk(struct rbd_device *rbd_dev,
				 struct rbd_image_header_ondisk *ondisk)
{
	struct rbd_image_header *header = &rbd_dev->header;
	bool first_time = header->object_prefix == NULL;
	struct ceph_snap_context *snapc;
	char *object_prefix = NULL;
	char *snap_names = NULL;
	u64 *snap_sizes = NULL;
	u32 snap_count;
	int ret = -ENOMEM;
	u32 i;

	/* Allocate this now to avoid having to handle failure below */

	if (first_time) {
		size_t len;

		len = strnlen(ondisk->object_prefix,
				sizeof (ondisk->object_prefix));
		object_prefix = kmalloc(len + 1, GFP_KERNEL);
		if (!object_prefix)
			return -ENOMEM;
		memcpy(object_prefix, ondisk->object_prefix, len);
		object_prefix[len] = '\0';
	}

	/* Allocate the snapshot context and fill it in */

	snap_count = le32_to_cpu(ondisk->snap_count);
	snapc = ceph_create_snap_context(snap_count, GFP_KERNEL);
	if (!snapc)
		goto out_err;
	snapc->seq = le64_to_cpu(ondisk->snap_seq);
	if (snap_count) {
		struct rbd_image_snap_ondisk *snaps;
		u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len);

		/* We'll keep a copy of the snapshot names... */

		if (snap_names_len > (u64)SIZE_MAX)
			goto out_2big;
		snap_names = kmalloc(snap_names_len, GFP_KERNEL);
		if (!snap_names)
			goto out_err;

		/* ...as well as the array of their sizes. */
		snap_sizes = kmalloc_array(snap_count,
					   sizeof(*header->snap_sizes),
					   GFP_KERNEL);
		if (!snap_sizes)
			goto out_err;

		/*
                 * Copy the names, and fill in each snapshot's id
                 * and size.
                 *
                 * Note that rbd_dev_v1_header_info() guarantees the
                 * ondisk buffer we're working with has
                 * snap_names_len bytes beyond the end of the
                 * snapshot id array, this memcpy() is safe.
                 */
		memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len);
		snaps = ondisk->snaps;
		for (i = 0; i < snap_count; i++) {
			snapc->snaps[i] = le64_to_cpu(snaps[i].id);
			snap_sizes[i] = le64_to_cpu(snaps[i].image_size);
		}
	}

	/* We won't fail any more, fill in the header */

	if (first_time) {
		header->object_prefix = object_prefix;
		header->obj_order = ondisk->options.order;
		header->crypt_type = ondisk->options.crypt_type;
		header->comp_type = ondisk->options.comp_type;
		/* The rest aren't used for format 1 images */
		header->stripe_unit = 0;
		header->stripe_count = 0;
		header->features = 0;
	} else {
		ceph_put_snap_context(header->snapc);
		kfree(header->snap_names);
		kfree(header->snap_sizes);
	}

	/* The remaining fields always get updated (when we refresh) */

	header->image_size = le64_to_cpu(ondisk->image_size);
	header->snapc = snapc;
	header->snap_names = snap_names;
	header->snap_sizes = snap_sizes;

	return 0;
out_2big:
	ret = -EIO;
out_err:
	kfree(snap_sizes);
	kfree(snap_names);
	ceph_put_snap_context(snapc);
	kfree(object_prefix);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 340 72.49% 17 89.47%
yehuda sadeh yehuda sadeh 125 26.65% 1 5.26%
sf markus elfring sf markus elfring 4 0.85% 1 5.26%
Total 469 100.00% 19 100.00%



static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which)
{
	const char *snap_name;

	rbd_assert(which < rbd_dev->header.snapc->num_snaps);

	/* Skip over names until we find the one we are looking for */

	snap_name = rbd_dev->header.snap_names;
	while (which--)
		snap_name += strlen(snap_name) + 1;

	return kstrdup(snap_name, GFP_KERNEL);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 65 100.00% 1 100.00%
Total 65 100.00% 1 100.00%

/*
 * Snapshot id comparison function for use with qsort()/bsearch().
 * Note that result is for snapshots in *descending* order.
 */


static int snapid_compare_reverse(const void *s1, const void *s2)
{
	u64 snap_id1 = *(u64 *)s1;
	u64 snap_id2 = *(u64 *)s2;

	if (snap_id1 < snap_id2)
		return 1;
	return snap_id1 == snap_id2 ? 0 : -1;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 55 100.00% 1 100.00%
Total 55 100.00% 1 100.00%

/*
 * Search a snapshot context to see if the given snapshot id is
 * present.
 *
 * Returns the position of the snapshot id in the array if it's found,
 * or BAD_SNAP_INDEX otherwise.
 *
 * Note: The snapshot array is in kept sorted (by the osd) in
 * reverse order, highest snapshot id first.
 */


static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id)
{
	struct ceph_snap_context *snapc = rbd_dev->header.snapc;
	u64 *found;

	found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps,
				sizeof (snap_id), snapid_compare_reverse);

	return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 73 100.00% 2 100.00%
Total 73 100.00% 2 100.00%



static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev,
					u64 snap_id)
{
	u32 which;
	const char *snap_name;

	which = rbd_dev_snap_index(rbd_dev, snap_id);
	if (which == BAD_SNAP_INDEX)
		return ERR_PTR(-ENOENT);

	snap_name = _rbd_dev_v1_snap_name(rbd_dev, which);
	return snap_name ? snap_name : ERR_PTR(-ENOMEM);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 43 65.15% 2 66.67%
josh durgin josh durgin 23 34.85% 1 33.33%
Total 66 100.00% 3 100.00%



static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id)
{
	if (snap_id == CEPH_NOSNAP)
		return RBD_SNAP_HEAD_NAME;

	rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
	if (rbd_dev->image_format == 1)
		return rbd_dev_v1_snap_name(rbd_dev, snap_id);

	return rbd_dev_v2_snap_name(rbd_dev, snap_id);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 59 100.00% 2 100.00%
Total 59 100.00% 2 100.00%



static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
				u64 *snap_size)
{
	rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
	if (snap_id == CEPH_NOSNAP) {
		*snap_size = rbd_dev->header.image_size;
	} else if (rbd_dev->image_format == 1) {
		u32 which;

		which = rbd_dev_snap_index(rbd_dev, snap_id);
		if (which == BAD_SNAP_INDEX)
			return -ENOENT;

		*snap_size = rbd_dev->header.snap_sizes[which];
	} else {
		u64 size = 0;
		int ret;

		ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size);
		if (ret)
			return ret;

		*snap_size = size;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 97 74.62% 6 66.67%
yehuda sadeh yehuda sadeh 28 21.54% 1 11.11%
josh durgin josh durgin 5 3.85% 2 22.22%
Total 130 100.00% 9 100.00%



static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
			u64 *snap_features)
{
	rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
	if (snap_id == CEPH_NOSNAP) {
		*snap_features = rbd_dev->header.features;
	} else if (rbd_dev->image_format == 1) {
		*snap_features = 0;	/* No features for format 1 */
	} else {
		u64 features = 0;
		int ret;

		ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features);
		if (ret)
			return ret;

		*snap_features = features;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 100 100.00% 2 100.00%
Total 100 100.00% 2 100.00%



static int rbd_dev_mapping_set(struct rbd_device *rbd_dev)
{
	u64 snap_id = rbd_dev->spec->snap_id;
	u64 size = 0;
	u64 features = 0;
	int ret;

	ret = rbd_snap_size(rbd_dev, snap_id, &size);
	if (ret)
		return ret;
	ret = rbd_snap_features(rbd_dev, snap_id, &features);
	if (ret)
		return ret;

	rbd_dev->mapping.size = size;
	rbd_dev->mapping.features = features;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 90 100.00% 2 100.00%
Total 90 100.00% 2 100.00%



static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev)
{
	rbd_dev->mapping.size = 0;
	rbd_dev->mapping.features = 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 3 100.00%
Total 27 100.00% 3 100.00%



static void rbd_segment_name_free(const char *name)
{
	/* The explicit cast here is needed to drop the const qualifier */

	kmem_cache_free(rbd_segment_name_cache, (void *)name);
}

Contributors
Person Tokens Prop Commits CommitProp
himangi saraogi himangi saraogi 23 100.00% 1 100.00%
Total 23 100.00% 1 100.00%



static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
{
	char *name;
	u64 segment;
	int ret;
	char *name_format;

	name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO);
	if (!name)
		return NULL;
	segment = offset >> rbd_dev->header.obj_order;
	name_format = "%s.%012llx";
	if (rbd_dev->image_format == 2)
		name_format = "%s.%016llx";
	ret = snprintf(name, CEPH_MAX_OID_NAME_LEN + 1, name_format,
			rbd_dev->header.object_prefix, segment);
	if (ret < 0 || ret > CEPH_MAX_OID_NAME_LEN) {
		pr_err("error formatting segment name for #%llu (%d)\n",
			segment, ret);
		rbd_segment_name_free(name);
		name = NULL;
	}

	return name;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 81 63.78% 5 55.56%
yehuda sadeh yehuda sadeh 22 17.32% 1 11.11%
josh durgin josh durgin 21 16.54% 1 11.11%
ilya dryomov ilya dryomov 2 1.57% 1 11.11%
himangi saraogi himangi saraogi 1 0.79% 1 11.11%
Total 127 100.00% 9 100.00%



static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset)
{
	u64 segment_size = (u64) 1 << rbd_dev->header.obj_order;

	return offset & (segment_size - 1);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 29 78.38% 1 50.00%
yehuda sadeh yehuda sadeh 8 21.62% 1 50.00%
Total 37 100.00% 2 100.00%



static u64 rbd_segment_length(struct rbd_device *rbd_dev,
				u64 offset, u64 length)
{
	u64 segment_size = (u64) 1 << rbd_dev->header.obj_order;

	offset &= segment_size - 1;

	rbd_assert(length <= U64_MAX - offset);
	if (offset + length > segment_size)
		length = segment_size - offset;

	return length;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 46 73.02% 2 66.67%
yehuda sadeh yehuda sadeh 17 26.98% 1 33.33%
Total 63 100.00% 3 100.00%

/*
 * returns the size of an object in the image
 */


static u64 rbd_obj_bytes(struct rbd_image_header *header)
{
	return 1 << header->obj_order;
}

Contributors
Person Tokens Prop Commits CommitProp
josh durgin josh durgin 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%

/*
 * bio helpers
 */



static void bio_chain_put(struct bio *chain)
{
	struct bio *tmp;

	while (chain) {
		tmp = chain;
		chain = chain->bi_next;
		bio_put(tmp);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%

/*
 * zeros a bio chain, starting at specific offset
 */


static void zero_bio_chain(struct bio *chain, int start_ofs)
{
	struct bio_vec bv;
	struct bvec_iter iter;
	unsigned long flags;
	void *buf;
	int pos = 0;

	while (chain) {
		bio_for_each_segment(bv, chain, iter) {
			if (pos + bv.bv_len > start_ofs) {
				int remainder = max(start_ofs - pos, 0);
				buf = bvec_kmap_irq(&bv, &flags);
				memset(buf + remainder, 0,
				       bv.bv_len - remainder);
				flush_dcache_page(bv.bv_page);
				bvec_kunmap_irq(buf, &flags);
			}
			pos += bv.bv_len;
		}

		chain = chain->bi_next;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 111 86.72% 1 25.00%
kent overstreet kent overstreet 10 7.81% 1 25.00%
alex elder alex elder 6 4.69% 1 25.00%
dan carpenter dan carpenter 1 0.78% 1 25.00%
Total 128 100.00% 4 100.00%

/*
 * similar to zero_bio_chain(), zeros data defined by a page array,
 * starting at the given byte offset from the start of the array and
 * continuing up to the given end offset.  The pages array is
 * assumed to be big enough to hold all bytes up to the end.
 */


static void zero_pages(struct page **pages, u64 offset, u64 end)
{
	struct page **page = &pages[offset >> PAGE_SHIFT];

	rbd_assert(end > offset);
	rbd_assert(end - offset <= (u64)SIZE_MAX);
	while (offset < end) {
		size_t page_offset;
		size_t length;
		unsigned long flags;
		void *kaddr;

		page_offset = offset & ~PAGE_MASK;
		length = min_t(size_t, PAGE_SIZE - page_offset, end - offset);
		local_irq_save(flags);
		kaddr = kmap_atomic(*page);
		memset(kaddr + page_offset, 0, length);
		flush_dcache_page(*page);
		kunmap_atomic(kaddr);
		local_irq_restore(flags);

		offset += length;
		page++;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 139 97.89% 2 66.67%
geert uytterhoeven geert uytterhoeven 3 2.11% 1 33.33%
Total 142 100.00% 3 100.00%

/*
 * Clone a portion of a bio, starting at the given byte offset
 * and continuing for the number of bytes indicated.
 */


static struct bio *bio_clone_range(struct bio *bio_src,
					unsigned int offset,
					unsigned int len,
					gfp_t gfpmask)
{
	struct bio *bio;

	bio = bio_clone(bio_src, gfpmask);
	if (!bio)
		return NULL;	/* ENOMEM */

	bio_advance(bio, offset);
	bio->bi_iter.bi_size = len;

	return bio;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 49 75.38% 1 25.00%
yehuda sadeh yehuda sadeh 11 16.92% 1 25.00%
kent overstreet kent overstreet 5 7.69% 2 50.00%
Total 65 100.00% 4 100.00%

/*
 * Clone a portion of a bio chain, starting at the given byte offset
 * into the first bio in the source chain and continuing for the
 * number of bytes indicated.  The result is another bio chain of
 * exactly the given length, or a null pointer on error.
 *
 * The bio_src and offset parameters are both in-out.  On entry they
 * refer to the first source bio and the offset into that bio where
 * the start of data to be cloned is located.
 *
 * On return, bio_src is updated to refer to the bio in the source
 * chain that contains first un-cloned byte, and *offset will
 * contain the offset of that byte within that bio.
 */


static struct bio *bio_chain_clone_range(struct bio **bio_src,
					unsigned int *offset,
					unsigned int len,
					gfp_t gfpmask)
{
	struct bio *bi = *bio_src;
	unsigned int off = *offset;
	struct bio *chain = NULL;
	struct bio **end;

	/* Build up a chain of clone bios up to the limit */

	if (!bi || off >= bi->bi_iter.bi_size || !len)
		return NULL;		/* Nothing to clone */

	end = &chain;
	while (len) {
		unsigned int bi_size;
		struct bio *bio;

		if (!bi) {
			rbd_warn(NULL, "bio_chain exhausted with %u left", len);
			goto out_err;	/* EINVAL; ran out of bio's */
		}
		bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len);
		bio = bio_clone_range(bi, off, bi_size, gfpmask);
		if (!bio)
			goto out_err;	/* ENOMEM */

		*end = bio;
		end = &bio->bi_next;

		off += bi_size;
		if (off == bi->bi_iter.bi_size) {
			bi = bi->bi_next;
			off = 0;
		}
		len -= bi_size;
	}
	*bio_src = bi;
	*offset = off;

	return chain;
out_err:
	bio_chain_put(chain);

	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 122 57.28% 3 60.00%
yehuda sadeh yehuda sadeh 86 40.38% 1 20.00%
kent overstreet kent overstreet 5 2.35% 1 20.00%
Total 213 100.00% 5 100.00%

/*
 * The default/initial value for all object request flags is 0.  For
 * each flag, once its value is set to 1 it is never reset to 0
 * again.
 */


static void obj_request_img_data_set(struct rbd_obj_request *obj_request)
{
	if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) {
		struct rbd_device *rbd_dev;

		rbd_dev = obj_request->img_request->rbd_dev;
		rbd_warn(rbd_dev, "obj_request %p already marked img_data",
			obj_request);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 46 97.87% 2 66.67%
ilya dryomov ilya dryomov 1 2.13% 1 33.33%
Total 47 100.00% 3 100.00%



static bool obj_request_img_data_test(struct rbd_obj_request *obj_request)
{
	smp_mb();
	return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 2 100.00%
Total 27 100.00% 2 100.00%



static void obj_request_done_set(struct rbd_obj_request *obj_request)
{
	if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) {
		struct rbd_device *rbd_dev = NULL;

		if (obj_request_img_data_test(obj_request))
			rbd_dev = obj_request->img_request->rbd_dev;
		rbd_warn(rbd_dev, "obj_request %p already marked done",
			obj_request);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 55 98.21% 2 66.67%
ilya dryomov ilya dryomov 1 1.79% 1 33.33%
Total 56 100.00% 3 100.00%



static bool obj_request_done_test(struct rbd_obj_request *obj_request)
{
	smp_mb();
	return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 2 100.00%
Total 27 100.00% 2 100.00%

/*
 * This sets the KNOWN flag after (possibly) setting the EXISTS
 * flag.  The latter is set based on the "exists" value provided.
 *
 * Note that for our purposes once an object exists it never goes
 * away again.  It's possible that the response from two existence
 * checks are separated by the creation of the target object, and
 * the first ("doesn't exist") response arrives *after* the second
 * ("does exist").  In that case we ignore the second one.
 */


static void obj_request_existence_set(struct rbd_obj_request *obj_request,
				bool exists)
{
	if (exists)
		set_bit(OBJ_REQ_EXISTS, &obj_request->flags);
	set_bit(OBJ_REQ_KNOWN, &obj_request->flags);
	smp_mb();
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static bool obj_request_known_test(struct rbd_obj_request *obj_request)
{
	smp_mb();
	return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



static bool obj_request_exists_test(struct rbd_obj_request *obj_request)
{
	smp_mb();
	return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request)
{
	struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev;

	return obj_request->img_offset <
	    round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header));
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 42 100.00% 1 100.00%
Total 42 100.00% 1 100.00%



static void rbd_obj_request_get(struct rbd_obj_request *obj_request)
{
	dout("%s: obj %p (was %d)\n", __func__, obj_request,
		atomic_read(&obj_request->kref.refcount));
	kref_get(&obj_request->kref);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 38 100.00% 3 100.00%
Total 38 100.00% 3 100.00%

static void rbd_obj_request_destroy(struct kref *kref);


static void rbd_obj_request_put(struct rbd_obj_request *obj_request)
{
	rbd_assert(obj_request != NULL);
	dout("%s: obj %p (was %d)\n", __func__, obj_request,
		atomic_read(&obj_request->kref.refcount));
	kref_put(&obj_request->kref, rbd_obj_request_destroy);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 47 100.00% 3 100.00%
Total 47 100.00% 3 100.00%



static void rbd_img_request_get(struct rbd_img_request *img_request)
{
	dout("%s: img %p (was %d)\n", __func__, img_request,
	     atomic_read(&img_request->kref.refcount));
	kref_get(&img_request->kref);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%

static bool img_request_child_test(struct rbd_img_request *img_request);
static void rbd_parent_request_destroy(struct kref *kref);
static void rbd_img_request_destroy(struct kref *kref);


static void rbd_img_request_put(struct rbd_img_request *img_request)
{
	rbd_assert(img_request != NULL);
	dout("%s: img %p (was %d)\n", __func__, img_request,
		atomic_read(&img_request->kref.refcount));
	if (img_request_child_test(img_request))
		kref_put(&img_request->kref, rbd_parent_request_destroy);
	else
		kref_put(&img_request->kref, rbd_img_request_destroy);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 65 100.00% 3 100.00%
Total 65 100.00% 3 100.00%



static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request,
					struct rbd_obj_request *obj_request)
{
	rbd_assert(obj_request->img_request == NULL);

	/* Image request now owns object's original reference */
	obj_request->img_request = img_request;
	obj_request->which = img_request->obj_request_count;
	rbd_assert(!obj_request_img_data_test(obj_request));
	obj_request_img_data_set(obj_request);
	rbd_assert(obj_request->which != BAD_WHICH);
	img_request->obj_request_count++;
	list_add_tail(&obj_request->links, &img_request->obj_requests);
	dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request,
		obj_request->which);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 97 100.00% 5 100.00%
Total 97 100.00% 5 100.00%



static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request,
					struct rbd_obj_request *obj_request)
{
	rbd_assert(obj_request->which != BAD_WHICH);

	dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request,
		obj_request->which);
	list_del(&obj_request->links);
	rbd_assert(img_request->obj_request_count > 0);
	img_request->obj_request_count--;
	rbd_assert(obj_request->which == img_request->obj_request_count);
	obj_request->which = BAD_WHICH;
	rbd_assert(obj_request_img_data_test(obj_request));
	rbd_assert(obj_request->img_request == img_request);
	obj_request->img_request = NULL;
	obj_request->callback = NULL;
	rbd_obj_request_put(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 114 100.00% 4 100.00%
Total 114 100.00% 4 100.00%



static bool obj_request_type_valid(enum obj_request_type type)
{
	switch (type) {
	case OBJ_REQUEST_NODATA:
	case OBJ_REQUEST_BIO:
	case OBJ_REQUEST_PAGES:
		return true;
	default:
		return false;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 32 100.00% 3 100.00%
Total 32 100.00% 3 100.00%

static void rbd_img_obj_callback(struct rbd_obj_request *obj_request);



static void rbd_obj_request_submit(struct rbd_obj_request *obj_request)
{
	struct ceph_osd_request *osd_req = obj_request->osd_req;

	dout("%s %p osd_req %p\n", __func__, obj_request, osd_req);
	if (obj_request_img_data_test(obj_request)) {
		WARN_ON(obj_request->callback != rbd_img_obj_callback);
		rbd_img_request_get(obj_request->img_request);
	}
	ceph_osdc_start_request(osd_req->r_osdc, osd_req, false);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 39 58.21% 2 25.00%
alex elder alex elder 22 32.84% 4 50.00%
yehuda sadeh yehuda sadeh 6 8.96% 2 25.00%
Total 67 100.00% 8 100.00%



static void rbd_obj_request_end(struct rbd_obj_request *obj_request)
{
	dout("%s %p\n", __func__, obj_request);
	ceph_osdc_cancel_request(obj_request->osd_req);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%

/*
 * Wait for an object request to complete.  If interrupted, cancel the
 * underlying osd request.
 *
 * @timeout: in jiffies, 0 means "wait forever"
 */


static int __rbd_obj_request_wait(struct rbd_obj_request *obj_request,
				  unsigned long timeout)
{
	long ret;

	dout("%s %p\n", __func__, obj_request);
	ret = wait_for_completion_interruptible_timeout(
					&obj_request->completion,
					ceph_timeout_jiffies(timeout));
	if (ret <= 0) {
		if (ret == 0)
			ret = -ETIMEDOUT;
		rbd_obj_request_end(obj_request);
	} else {
		ret = 0;
	}

	dout("%s %p ret %d\n", __func__, obj_request, (int)ret);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 90 100.00% 2 100.00%
Total 90 100.00% 2 100.00%



static int rbd_obj_request_wait(struct rbd_obj_request *obj_request)
{
	return __rbd_obj_request_wait(obj_request, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 19 100.00% 2 100.00%
Total 19 100.00% 2 100.00%



static void rbd_img_request_complete(struct rbd_img_request *img_request)
{

	dout("%s: img %p\n", __func__, img_request);

	/*
         * If no error occurred, compute the aggregate transfer
         * count for the image request.  We could instead use
         * atomic64_cmpxchg() to update it as each object request
         * completes; not clear which way is better off hand.
         */
	if (!img_request->result) {
		struct rbd_obj_request *obj_request;
		u64 xferred = 0;

		for_each_obj_request(img_request, obj_request)
			xferred += obj_request->xferred;
		img_request->xferred = xferred;
	}

	if (img_request->callback)
		img_request->callback(img_request);
	else
		rbd_img_request_put(img_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 77 100.00% 3 100.00%
Total 77 100.00% 3 100.00%

/*
 * The default/initial value for all image request flags is 0.  Each
 * is conditionally set to 1 at image request initialization time
 * and currently never change thereafter.
 */


static void img_request_write_set(struct rbd_img_request *img_request)
{
	set_bit(IMG_REQ_WRITE, &img_request->flags);
	smp_mb();
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static bool img_request_write_test(struct rbd_img_request *img_request)
{
	smp_mb();
	return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%

/*
 * Set the discard flag when the img_request is an discard request
 */


static void img_request_discard_set(struct rbd_img_request *img_request)
{
	set_bit(IMG_REQ_DISCARD, &img_request->flags);
	smp_mb();
}

Contributors
Person Tokens Prop Commits CommitProp
guangliang zhao guangliang zhao 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static bool img_request_discard_test(struct rbd_img_request *img_request)
{
	smp_mb();
	return test_bit(IMG_REQ_DISCARD, &img_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
guangliang zhao guangliang zhao 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



static void img_request_child_set(struct rbd_img_request *img_request)
{
	set_bit(IMG_REQ_CHILD, &img_request->flags);
	smp_mb();
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static void img_request_child_clear(struct rbd_img_request *img_request)
{
	clear_bit(IMG_REQ_CHILD, &img_request->flags);
	smp_mb();
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 24 100.00% 2 100.00%
Total 24 100.00% 2 100.00%



static bool img_request_child_test(struct rbd_img_request *img_request)
{
	smp_mb();
	return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



static void img_request_layered_set(struct rbd_img_request *img_request)
{
	set_bit(IMG_REQ_LAYERED, &img_request->flags);
	smp_mb();
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static void img_request_layered_clear(struct rbd_img_request *img_request)
{
	clear_bit(IMG_REQ_LAYERED, &img_request->flags);
	smp_mb();
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static bool img_request_layered_test(struct rbd_img_request *img_request)
{
	smp_mb();
	return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%


static enum obj_operation_type

rbd_img_request_op_type(struct rbd_img_request *img_request)
{
	if (img_request_write_test(img_request))
		return OBJ_OP_WRITE;
	else if (img_request_discard_test(img_request))
		return OBJ_OP_DISCARD;
	else
		return OBJ_OP_READ;
}

Contributors
Person Tokens Prop Commits CommitProp
josh durgin josh durgin 36 97.30% 1 50.00%
alex elder alex elder 1 2.70% 1 50.00%
Total 37 100.00% 2 100.00%


static void

rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request)
{
	u64 xferred = obj_request->xferred;
	u64 length = obj_request->length;

	dout("%s: obj %p img %p result %d %llu/%llu\n", __func__,
		obj_request, obj_request->img_request, obj_request->result,
		xferred, length);
	/*
         * ENOENT means a hole in the image.  We zero-fill the entire
         * length of the request.  A short read also implies zero-fill
         * to the end of the request.  An error requires the whole
         * length of the request to be reported finished with an error
         * to the block layer.  In each case we update the xferred
         * count to indicate the whole request was satisfied.
         */
	rbd_assert(obj_request->type != OBJ_REQUEST_NODATA);
	if (obj_request->result == -ENOENT) {
		if (obj_request->type == OBJ_REQUEST_BIO)
			zero_bio_chain(obj_request->bio_list, 0);
		else
			zero_pages(obj_request->pages, 0, length);
		obj_request->result = 0;
	} else if (xferred < length && !obj_request->result) {
		if (obj_request->type == OBJ_REQUEST_BIO)
			zero_bio_chain(obj_request->bio_list, xferred);
		else
			zero_pages(obj_request->pages, xferred, length);
	}
	obj_request->xferred = length;
	obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 153 98.08% 2 50.00%
josh durgin josh durgin 3 1.92% 2 50.00%
Total 156 100.00% 4 100.00%



static void rbd_obj_request_complete(struct rbd_obj_request *obj_request)
{
	dout("%s: obj %p cb %p\n", __func__, obj_request,
		obj_request->callback);
	if (obj_request->callback)
		obj_request->callback(obj_request);
	else
		complete_all(&obj_request->completion);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 46 100.00% 3 100.00%
Total 46 100.00% 3 100.00%



static void rbd_obj_request_error(struct rbd_obj_request *obj_request, int err)
{
	obj_request->result = err;
	obj_request->xferred = 0;
	/*
         * kludge - mirror rbd_obj_request_submit() to match a put in
         * rbd_img_obj_callback()
         */
	if (obj_request_img_data_test(obj_request)) {
		WARN_ON(obj_request->callback != rbd_img_obj_callback);
		rbd_img_request_get(obj_request->img_request);
	}
	obj_request_done_set(obj_request);
	rbd_obj_request_complete(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 62 100.00% 1 100.00%
Total 62 100.00% 1 100.00%



static void rbd_osd_read_callback(struct rbd_obj_request *obj_request)
{
	struct rbd_img_request *img_request = NULL;
	struct rbd_device *rbd_dev = NULL;
	bool layered = false;

	if (obj_request_img_data_test(obj_request)) {
		img_request = obj_request->img_request;
		layered = img_request && img_request_layered_test(img_request);
		rbd_dev = img_request->rbd_dev;
	}

	dout("%s: obj %p img %p result %d %llu/%llu\n", __func__,
		obj_request, img_request, obj_request->result,
		obj_request->xferred, obj_request->length);
	if (layered && obj_request->result == -ENOENT &&
			obj_request->img_offset < rbd_dev->parent_overlap)
		rbd_img_parent_read(obj_request);
	else if (img_request)
		rbd_img_obj_request_read_callback(obj_request);
	else
		obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 123 100.00% 9 100.00%
Total 123 100.00% 9 100.00%



static void rbd_osd_write_callback(struct rbd_obj_request *obj_request)
{
	dout("%s: obj %p result %d %llu\n", __func__, obj_request,
		obj_request->result, obj_request->length);
	/*
         * There is no such thing as a successful short write.  Set
         * it to our originally-requested length.
         */
	obj_request->xferred = obj_request->length;
	obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 41 97.62% 5 83.33%
sage weil sage weil 1 2.38% 1 16.67%
Total 42 100.00% 6 100.00%



static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request)
{
	dout("%s: obj %p result %d %llu\n", __func__, obj_request,
		obj_request->result, obj_request->length);
	/*
         * There is no such thing as a successful short discard.  Set
         * it to our originally-requested length.
         */
	obj_request->xferred = obj_request->length;
	/* discarding a non-existent object is not a problem */
	if (obj_request->result == -ENOENT)
		obj_request->result = 0;
	obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
guangliang zhao guangliang zhao 42 72.41% 1 50.00%
josh durgin josh durgin 16 27.59% 1 50.00%
Total 58 100.00% 2 100.00%

/*
 * For a simple stat call there's nothing to do.  We'll do more if
 * this is part of a write sequence for a layered image.
 */


static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request)
{
	dout("%s: obj %p\n", __func__, obj_request);
	obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 25 100.00% 2 100.00%
Total 25 100.00% 2 100.00%



static void rbd_osd_call_callback(struct rbd_obj_request *obj_request)
{
	dout("%s: obj %p\n", __func__, obj_request);

	if (obj_request_img_data_test(obj_request))
		rbd_osd_copyup_callback(obj_request);
	else
		obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%



static void rbd_osd_req_callback(struct ceph_osd_request *osd_req)
{
	struct rbd_obj_request *obj_request = osd_req->r_priv;
	u16 opcode;

	dout("%s: osd_req %p\n", __func__, osd_req);
	rbd_assert(osd_req == obj_request->osd_req);
	if (obj_request_img_data_test(obj_request)) {
		rbd_assert(obj_request->img_request);
		rbd_assert(obj_request->which != BAD_WHICH);
	} else {
		rbd_assert(obj_request->which == BAD_WHICH);
	}

	if (osd_req->r_result < 0)
		obj_request->result = osd_req->r_result;

	/*
         * We support a 64-bit length, but ultimately it has to be
         * passed to the block layer, which just supports a 32-bit
         * length field.
         */
	obj_request->xferred = osd_req->r_ops[0].outdata_len;
	rbd_assert(obj_request->xferred < (u64)UINT_MAX);

	opcode = osd_req->r_ops[0].op;
	switch (opcode) {
	case CEPH_OSD_OP_READ:
		rbd_osd_read_callback(obj_request);
		break;
	case CEPH_OSD_OP_SETALLOCHINT:
		rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE ||
			   osd_req->r_ops[1].op == CEPH_OSD_OP_WRITEFULL);
		/* fall through */
	case CEPH_OSD_OP_WRITE:
	case CEPH_OSD_OP_WRITEFULL:
		rbd_osd_write_callback(obj_request);
		break;
	case CEPH_OSD_OP_STAT:
		rbd_osd_stat_callback(obj_request);
		break;
	case CEPH_OSD_OP_DELETE:
	case CEPH_OSD_OP_TRUNCATE:
	case CEPH_OSD_OP_ZERO:
		rbd_osd_discard_callback(obj_request);
		break;
	case CEPH_OSD_OP_CALL:
		rbd_osd_call_callback(obj_request);
		break;
	default:
		rbd_warn(NULL, "%s: unsupported op %hu",
			obj_request->object_name, (unsigned short) opcode);
		break;
	}

	if (obj_request_done_test(obj_request))
		rbd_obj_request_complete(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 174 69.32% 11 55.00%
ilya dryomov ilya dryomov 40 15.94% 5 25.00%
sage weil sage weil 18 7.17% 1 5.00%
guangliang zhao guangliang zhao 15 5.98% 1 5.00%
zhen yan zhen yan 3 1.20% 1 5.00%
christoph hellwig christoph hellwig 1 0.40% 1 5.00%
Total 251 100.00% 20 100.00%



static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request)
{
	struct ceph_osd_request *osd_req = obj_request->osd_req;

	rbd_assert(obj_request_img_data_test(obj_request));
	osd_req->r_snapid = obj_request->img_request->snap_id;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 26 68.42% 3 60.00%
ilya dryomov ilya dryomov 12 31.58% 2 40.00%
Total 38 100.00% 5 100.00%



static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request)
{
	struct ceph_osd_request *osd_req = obj_request->osd_req;

	osd_req->r_mtime = CURRENT_TIME;
	osd_req->r_data_offset = obj_request->offset;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 28 82.35% 3 75.00%
ilya dryomov ilya dryomov 6 17.65% 1 25.00%
Total 34 100.00% 4 100.00%

/*
 * Create an osd request.  A read request has one osd op (read).
 * A write request has either one (watch) or two (hint+write) osd ops.
 * (All rbd data writes are prefixed with an allocation hint op, but
 * technically osd watch is a write request, hence this distinction.)
 */


static struct ceph_osd_request *rbd_osd_req_create(
					struct rbd_device *rbd_dev,
					enum obj_operation_type op_type,
					unsigned int num_ops,
					struct rbd_obj_request *obj_request)
{
	struct ceph_snap_context *snapc = NULL;
	struct ceph_osd_client *osdc;
	struct ceph_osd_request *osd_req;

	if (obj_request_img_data_test(obj_request) &&
		(op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_WRITE)) {
		struct rbd_img_request *img_request = obj_request->img_request;
		if (op_type == OBJ_OP_WRITE) {
			rbd_assert(img_request_write_test(img_request));
		} else {
			rbd_assert(img_request_discard_test(img_request));
		}
		snapc = img_request->snapc;
	}

	rbd_assert(num_ops == 1 || ((op_type == OBJ_OP_WRITE) && num_ops == 2));

	/* Allocate and initialize the request, for the num_ops ops */

	osdc = &rbd_dev->rbd_client->client->osdc;
	osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false,
					  GFP_NOIO);
	if (!osd_req)
		goto fail;

	if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD)
		osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK;
	else
		osd_req->r_flags = CEPH_OSD_FLAG_READ;

	osd_req->r_callback = rbd_osd_req_callback;
	osd_req->r_priv = obj_request;

	osd_req->r_base_oloc.pool = rbd_dev->layout.pool_id;
	if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s",
			     obj_request->object_name))
		goto fail;

	if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO))
		goto fail;

	return osd_req;

fail:
	ceph_osdc_put_request(osd_req);
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 140 55.34% 4 26.67%
ilya dryomov ilya dryomov 66 26.09% 7 46.67%
guangliang zhao guangliang zhao 44 17.39% 2 13.33%
zhen yan zhen yan 2 0.79% 1 6.67%
david disseldorp david disseldorp 1 0.40% 1 6.67%
Total 253 100.00% 15 100.00%

/*
 * Create a copyup osd request based on the information in the object
 * request supplied.  A copyup request has two or three osd ops, a
 * copyup method call, potentially a hint op, and a write or truncate
 * or zero op.
 */

static struct ceph_osd_request *

rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request)
{
	struct rbd_img_request *img_request;
	struct ceph_snap_context *snapc;
	struct rbd_device *rbd_dev;
	struct ceph_osd_client *osdc;
	struct ceph_osd_request *osd_req;
	int num_osd_ops = 3;

	rbd_assert(obj_request_img_data_test(obj_request));
	img_request = obj_request->img_request;
	rbd_assert(img_request);
	rbd_assert(img_request_write_test(img_request) ||
			img_request_discard_test(img_request));

	if (img_request_discard_test(img_request))
		num_osd_ops = 2;

	/* Allocate and initialize the request, for all the ops */

	snapc = img_request->snapc;
	rbd_dev = img_request->rbd_dev;
	osdc = &rbd_dev->rbd_client->client->osdc;
	osd_req = ceph_osdc_alloc_request(osdc, snapc, num_osd_ops,
						false, GFP_NOIO);
	if (!osd_req)
		goto fail;

	osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK;
	osd_req->r_callback = rbd_osd_req_callback;
	osd_req->r_priv = obj_request;

	osd_req->r_base_oloc.pool = rbd_dev->layout.pool_id;
	if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s",
			     obj_request->object_name))
		goto fail;

	if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO))
		goto fail;

	return osd_req;

fail:
	ceph_osdc_put_request(osd_req);
	return NULL;
}


Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 139 65.88% 1 11.11%
ilya dryomov ilya dryomov 46 21.80% 5 55.56%
josh durgin josh durgin 23 10.90% 1 11.11%
zhen yan zhen yan 2 0.95% 1 11.11%
david disseldorp david disseldorp 1 0.47% 1 11.11%
Total 211 100.00% 9 100.00%



static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req)
{
	ceph_osdc_put_request(osd_req);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 16 100.00% 2 100.00%
Total 16 100.00% 2 100.00%

/* object_name is assumed to be a non-null pointer and NUL-terminated */



static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
						u64 offset, u64 length,
						enum obj_request_type type)
{
	struct rbd_obj_request *obj_request;
	size_t size;
	char *name;

	rbd_assert(obj_request_type_valid(type));

	size = strlen(object_name) + 1;
	name = kmalloc(size, GFP_NOIO);
	if (!name)
		return NULL;

	obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO);
	if (!obj_request) {
		kfree(name);
		return NULL;
	}

	obj_request->object_name = memcpy(name, object_name, size);
	obj_request->offset = offset;
	obj_request->length = length;
	obj_request->flags = 0;
	obj_request->which = BAD_WHICH;
	obj_request->type = type;
	INIT_LIST_HEAD(&obj_request->links);
	init_completion(&obj_request->completion);
	kref_init(&obj_request->kref);

	dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name,
		offset, length, (int)type, obj_request);

	return obj_request;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 181 98.91% 7 87.50%
ilya dryomov ilya dryomov 2 1.09% 1 12.50%
Total 183 100.00% 8 100.00%



static void rbd_obj_request_destroy(struct kref *kref)
{
	struct rbd_obj_request *obj_request;

	obj_request = container_of(kref, struct rbd_obj_request, kref);

	dout("%s: obj %p\n", __func__, obj_request);

	rbd_assert(obj_request->img_request == NULL);
	rbd_assert(obj_request->which == BAD_WHICH);

	if (obj_request->osd_req)
		rbd_osd_req_destroy(obj_request->osd_req);

	rbd_assert(obj_request_type_valid(obj_request->type));
	switch (obj_request->type) {
	case OBJ_REQUEST_NODATA:
		break;		/* Nothing to do */
	case OBJ_REQUEST_BIO:
		if (obj_request->bio_list)
			bio_chain_put(obj_request->bio_list);
		break;
	case OBJ_REQUEST_PAGES:
		/* img_data requests don't own their page array */
		if (obj_request->pages &&
		    !obj_request_img_data_test(obj_request))
			ceph_release_page_vector(obj_request->pages,
						obj_request->page_count);
		break;
	}

	kfree(obj_request->object_name);
	obj_request->object_name = NULL;
	kmem_cache_free(rbd_obj_request_cache, obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 149 95.51% 7 87.50%
ilya dryomov ilya dryomov 7 4.49% 1 12.50%
Total 156 100.00% 8 100.00%

/* It's OK to call this for a device with no parent */

static void rbd_spec_put(struct rbd_spec *spec);


static void rbd_dev_unparent(struct rbd_device *rbd_dev)
{
	rbd_dev_remove_parent(rbd_dev);
	rbd_spec_put(rbd_dev->parent_spec);
	rbd_dev->parent_spec = NULL;
	rbd_dev->parent_overlap = 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%

/*
 * Parent image reference counting is used to determine when an
 * image's parent fields can be safely torn down--after there are no
 * more in-flight requests to the parent image.  When the last
 * reference is dropped, cleaning them up is safe.
 */


static void rbd_dev_parent_put(struct rbd_device *rbd_dev)
{
	int counter;

	if (!rbd_dev->parent_spec)
		return;

	counter = atomic_dec_return_safe(&rbd_dev->parent_ref);
	if (counter > 0)
		return;

	/* Last reference; clean up parent data structures */

	if (!counter)
		rbd_dev_unparent(rbd_dev);
	else
		rbd_warn(rbd_dev, "parent reference underflow");
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 57 98.28% 1 50.00%
ilya dryomov ilya dryomov 1 1.72% 1 50.00%
Total 58 100.00% 2 100.00%

/*
 * If an image has a non-zero parent overlap, get a reference to its
 * parent.
 *
 * Returns true if the rbd device has a parent with a non-zero
 * overlap and a reference for it was successfully taken, or
 * false otherwise.
 */


static bool rbd_dev_parent_get(struct rbd_device *rbd_dev)
{
	int counter = 0;

	if (!rbd_dev->parent_spec)
		return false;

	down_read(&rbd_dev->header_rwsem);
	if (rbd_dev->parent_overlap)
		counter = atomic_inc_return_safe(&rbd_dev->parent_ref);
	up_read(&rbd_dev->header_rwsem);

	if (counter < 0)
		rbd_warn(rbd_dev, "parent reference overflow");

	return counter > 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 50 65.79% 1 33.33%
ilya dryomov ilya dryomov 26 34.21% 2 66.67%
Total 76 100.00% 3 100.00%

/*
 * Caller is responsible for filling in the list of object requests
 * that comprises the image request, and the Linux request pointer
 * (if there is one).
 */


static struct rbd_img_request *rbd_img_request_create(
					struct rbd_device *rbd_dev,
					u64 offset, u64 length,
					enum obj_operation_type op_type,
					struct ceph_snap_context *snapc)
{
	struct rbd_img_request *img_request;

	img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO);
	if (!img_request)
		return NULL;

	img_request->rq = NULL;
	img_request->rbd_dev = rbd_dev;
	img_request->offset = offset;
	img_request->length = length;
	img_request->flags = 0;
	if (op_type == OBJ_OP_DISCARD) {
		img_request_discard_set(img_request);
		img_request->snapc = snapc;
	} else if (op_type == OBJ_OP_WRITE) {
		img_request_write_set(img_request);
		img_request->snapc = snapc;
	} else {
		img_request->snap_id = rbd_dev->spec->snap_id;
	}
	if (rbd_dev_parent_get(rbd_dev))
		img_request_layered_set(img_request);
	spin_lock_init(&img_request->completion_lock);
	img_request->next_completion = 0;
	img_request->callback = NULL;
	img_request->result = 0;
	img_request->obj_request_count = 0;
	INIT_LIST_HEAD(&img_request->obj_requests);
	kref_init(&img_request->kref);

	dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev,
		obj_op_name(op_type), offset, length, img_request);

	return img_request;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 179 83.26% 10 71.43%
guangliang zhao guangliang zhao 30 13.95% 2 14.29%
josh durgin josh durgin 5 2.33% 1 7.14%
ilya dryomov ilya dryomov 1 0.47% 1 7.14%
Total 215 100.00% 14 100.00%



static void rbd_img_request_destroy(struct kref *kref)
{
	struct rbd_img_request *img_request;
	struct rbd_obj_request *obj_request;
	struct rbd_obj_request *next_obj_request;

	img_request = container_of(kref, struct rbd_img_request, kref);

	dout("%s: img %p\n", __func__, img_request);

	for_each_obj_request_safe(img_request, obj_request, next_obj_request)
		rbd_img_obj_request_del(img_request, obj_request);
	rbd_assert(img_request->obj_request_count == 0);

	if (img_request_layered_test(img_request)) {
		img_request_layered_clear(img_request);
		rbd_dev_parent_put(img_request->rbd_dev);
	}

	if (img_request_write_test(img_request) ||
		img_request_discard_test(img_request))
		ceph_put_snap_context(img_request->snapc);

	kmem_cache_free(rbd_img_request_cache, img_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 113 95.76% 9 90.00%
josh durgin josh durgin 5 4.24% 1 10.00%
Total 118 100.00% 10 100.00%



static struct rbd_img_request *rbd_parent_request_create(
					struct rbd_obj_request *obj_request,
					u64 img_offset, u64 length)
{
	struct rbd_img_request *parent_request;
	struct rbd_device *rbd_dev;

	rbd_assert(obj_request->img_request);
	rbd_dev = obj_request->img_request->rbd_dev;

	parent_request = rbd_img_request_create(rbd_dev->parent, img_offset,
						length, OBJ_OP_READ, NULL);
	if (!parent_request)
		return NULL;

	img_request_child_set(parent_request);
	rbd_obj_request_get(obj_request);
	parent_request->obj_request = obj_request;

	return parent_request;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 85 96.59% 2 50.00%
josh durgin josh durgin 2 2.27% 1 25.00%
guangliang zhao guangliang zhao 1 1.14% 1 25.00%
Total 88 100.00% 4 100.00%



static void rbd_parent_request_destroy(struct kref *kref)
{
	struct rbd_img_request *parent_request;
	struct rbd_obj_request *orig_request;

	parent_request = container_of(kref, struct rbd_img_request, kref);
	orig_request = parent_request->obj_request;

	parent_request->obj_request = NULL;
	rbd_obj_request_put(orig_request);
	img_request_child_clear(parent_request);

	rbd_img_request_destroy(kref);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 60 100.00% 4 100.00%
Total 60 100.00% 4 100.00%



static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request)
{
	struct rbd_img_request *img_request;
	unsigned int xferred;
	int result;
	bool more;

	rbd_assert(obj_request_img_data_test(obj_request));
	img_request = obj_request->img_request;

	rbd_assert(obj_request->xferred <= (u64)UINT_MAX);
	xferred = (unsigned int)obj_request->xferred;
	result = obj_request->result;
	if (result) {
		struct rbd_device *rbd_dev = img_request->rbd_dev;
		enum obj_operation_type op_type;

		if (img_request_discard_test(img_request))
			op_type = OBJ_OP_DISCARD;
		else if (img_request_write_test(img_request))
			op_type = OBJ_OP_WRITE;
		else
			op_type = OBJ_OP_READ;

		rbd_warn(rbd_dev, "%s %llx at %llx (%llx)",
			obj_op_name(op_type), obj_request->length,
			obj_request->img_offset, obj_request->offset);
		rbd_warn(rbd_dev, "  result %d xferred %x",
			result, xferred);
		if (!img_request->result)
			img_request->result = result;
		/*
                 * Need to end I/O on the entire obj_request worth of
                 * bytes in case of error.
                 */
		xferred = obj_request->length;
	}

	if (img_request_child_test(img_request)) {
		rbd_assert(img_request->obj_request != NULL);
		more = obj_request->which < img_request->obj_request_count - 1;
	} else {
		rbd_assert(img_request->rq != NULL);

		more = blk_update_request(img_request->rq, result, xferred);
		if (!more)
			__blk_mq_end_request(img_request->rq, result);
	}

	return more;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 184 76.03% 3 37.50%
guangliang zhao guangliang zhao 34 14.05% 2 25.00%
christoph hellwig christoph hellwig 15 6.20% 1 12.50%
ilya dryomov ilya dryomov 9 3.72% 2 25.00%
Total 242 100.00% 8 100.00%



static void rbd_img_obj_callback(struct rbd_obj_request *obj_request)
{
	struct rbd_img_request *img_request;
	u32 which = obj_request->which;
	bool more = true;

	rbd_assert(obj_request_img_data_test(obj_request));
	img_request = obj_request->img_request;

	dout("%s: img %p obj %p\n", __func__, img_request, obj_request);
	rbd_assert(img_request != NULL);
	rbd_assert(img_request->obj_request_count > 0);
	rbd_assert(which != BAD_WHICH);
	rbd_assert(which < img_request->obj_request_count);

	spin_lock_irq(&img_request->completion_lock);
	if (which != img_request->next_completion)
		goto out;

	for_each_obj_request_from(img_request, obj_request) {
		rbd_assert(more);
		rbd_assert(which < img_request->obj_request_count);

		if (!obj_request_done_test(obj_request))
			break;
		more = rbd_img_obj_end_request(obj_request);
		which++;
	}

	rbd_assert(more ^ (which == img_request->obj_request_count));
	img_request->next_completion = which;
out:
	spin_unlock_irq(&img_request->completion_lock);
	rbd_img_request_put(img_request);

	if (!more)
		rbd_img_request_complete(img_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 189 100.00% 4 100.00%
Total 189 100.00% 4 100.00%

/*
 * Add individual osd ops to the given ceph_osd_request and prepare
 * them for submission. num_ops is the current number of
 * osd operations already to the object request.
 */


static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request,
				struct ceph_osd_request *osd_request,
				enum obj_operation_type op_type,
				unsigned int num_ops)
{
	struct rbd_img_request *img_request = obj_request->img_request;
	struct rbd_device *rbd_dev = img_request->rbd_dev;
	u64 object_size = rbd_obj_bytes(&rbd_dev->header);
	u64 offset = obj_request->offset;
	u64 length = obj_request->length;
	u64 img_end;
	u16 opcode;

	if (op_type == OBJ_OP_DISCARD) {
		if (!offset && length == object_size &&
		    (!img_request_layered_test(img_request) ||
		     !obj_request_overlaps_parent(obj_request))) {
			opcode = CEPH_OSD_OP_DELETE;
		} else if ((offset + length == object_size)) {
			opcode = CEPH_OSD_OP_TRUNCATE;
		} else {
			down_read(&rbd_dev->header_rwsem);
			img_end = rbd_dev->header.image_size;
			up_read(&rbd_dev->header_rwsem);

			if (obj_request->img_offset + length == img_end)
				opcode = CEPH_OSD_OP_TRUNCATE;
			else
				opcode = CEPH_OSD_OP_ZERO;
		}
	} else if (op_type == OBJ_OP_WRITE) {
		if (!offset && length == object_size)
			opcode = CEPH_OSD_OP_WRITEFULL;
		else
			opcode = CEPH_OSD_OP_WRITE;
		osd_req_op_alloc_hint_init(osd_request, num_ops,
					object_size, object_size);
		num_ops++;
	} else {
		opcode = CEPH_OSD_OP_READ;
	}

	if (opcode == CEPH_OSD_OP_DELETE)
		osd_req_op_init(osd_request, num_ops, opcode, 0);
	else
		osd_req_op_extent_init(osd_request, num_ops, opcode,
				       offset, length, 0, 0);

	if (obj_request->type == OBJ_REQUEST_BIO)
		osd_req_op_extent_osd_data_bio(osd_request, num_ops,
					obj_request->bio_list, length);
	else if (obj_request->type == OBJ_REQUEST_PAGES)
		osd_req_op_extent_osd_data_pages(osd_request, num_ops,
					obj_request->pages, length,
					offset & ~PAGE_MASK, false, false);

	/* Discards are also writes */
	if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD)
		rbd_osd_req_format_write(obj_request);
	else
		rbd_osd_req_format_read(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
josh durgin josh durgin 232 70.30% 2 16.67%
alex elder alex elder 46 13.94% 4 33.33%
ilya dryomov ilya dryomov 30 9.09% 2 16.67%
guangliang zhao guangliang zhao 19 5.76% 2 16.67%
zhen yan zhen yan 2 0.61% 1 8.33%
sage weil sage weil 1 0.30% 1 8.33%
Total 330 100.00% 12 100.00%

/*
 * Split up an image request into one or more object requests, each
 * to a different object.  The "type" parameter indicates whether
 * "data_desc" is the pointer to the head of a list of bio
 * structures, or the base of a page array.  In either case this
 * function assumes data_desc describes memory sufficient to hold
 * all data described by the image request.
 */


static int rbd_img_request_fill(struct rbd_img_request *img_request,
					enum obj_request_type type,
					void *data_desc)
{
	struct rbd_device *rbd_dev = img_request->rbd_dev;
	struct rbd_obj_request *obj_request = NULL;
	struct rbd_obj_request *next_obj_request;
	struct bio *bio_list = NULL;
	unsigned int bio_offset = 0;
	struct page **pages = NULL;
	enum obj_operation_type op_type;
	u64 img_offset;
	u64 resid;

	dout("%s: img %p type %d data_desc %p\n", __func__, img_request,
		(int)type, data_desc);

	img_offset = img_request->offset;
	resid = img_request->length;
	rbd_assert(resid > 0);
	op_type = rbd_img_request_op_type(img_request);

	if (type == OBJ_REQUEST_BIO) {
		bio_list = data_desc;
		rbd_assert(img_offset ==
			   bio_list->bi_iter.bi_sector << SECTOR_SHIFT);
	} else if (type == OBJ_REQUEST_PAGES) {
		pages = data_desc;
	}

	while (resid) {
		struct ceph_osd_request *osd_req;
		const char *object_name;
		u64 offset;
		u64 length;

		object_name = rbd_segment_name(rbd_dev, img_offset);
		if (!object_name)
			goto out_unwind;
		offset = rbd_segment_offset(rbd_dev, img_offset);
		length = rbd_segment_length(rbd_dev, img_offset, resid);
		obj_request = rbd_obj_request_create(object_name,
						offset, length, type);
		/* object request has its own copy of the object name */
		rbd_segment_name_free(object_name);
		if (!obj_request)
			goto out_unwind;

		/*
                 * set obj_request->img_request before creating the
                 * osd_request so that it gets the right snapc
                 */
		rbd_img_obj_request_add(img_request, obj_request);

		if (type == OBJ_REQUEST_BIO) {
			unsigned int clone_size;

			rbd_assert(length <= (u64)UINT_MAX);
			clone_size = (unsigned int)length;
			obj_request->bio_list =
					bio_chain_clone_range(&bio_list,
								&bio_offset,
								clone_size,
								GFP_NOIO);
			if (!obj_request->bio_list)
				goto out_unwind;
		} else if (type == OBJ_REQUEST_PAGES) {
			unsigned int page_count;

			obj_request->pages = pages;
			page_count = (u32)calc_pages_for(offset, length);
			obj_request->page_count = page_count;
			if ((offset + length) & ~PAGE_MASK)
				page_count--;	/* more on last page */
			pages += page_count;
		}

		osd_req = rbd_osd_req_create(rbd_dev, op_type,
					(op_type == OBJ_OP_WRITE) ? 2 : 1,
					obj_request);
		if (!osd_req)
			goto out_unwind;

		obj_request->osd_req = osd_req;
		obj_request->callback = rbd_img_obj_callback;
		obj_request->img_offset = img_offset;

		rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0);

		img_offset += length;
		resid -= length;
	}

	return 0;

out_unwind:
	for_each_obj_request_safe(img_request, obj_request, next_obj_request)
		rbd_img_obj_request_del(img_request, obj_request);

	return -ENOMEM;
}

Contributors
Person Tokens Prop Commits CommitProp
josh durgin josh durgin 264 58.93% 3 13.64%
alex elder alex elder 151 33.71% 12 54.55%
guangliang zhao guangliang zhao 22 4.91% 2 9.09%
ilya dryomov ilya dryomov 10 2.23% 4 18.18%
david disseldorp david disseldorp 1 0.22% 1 4.55%
Total 448 100.00% 22 100.00%


static void

rbd_osd_copyup_callback(struct rbd_obj_request *obj_request)
{
	struct rbd_img_request *img_request;
	struct rbd_device *rbd_dev;
	struct page **pages;
	u32 page_count;

	dout("%s: obj %p\n", __func__, obj_request);

	rbd_assert(obj_request->type == OBJ_REQUEST_BIO ||
		obj_request->type == OBJ_REQUEST_NODATA);
	rbd_assert(obj_request_img_data_test(obj_request));
	img_request = obj_request->img_request;
	rbd_assert(img_request);

	rbd_dev = img_request->rbd_dev;
	rbd_assert(rbd_dev);

	pages = obj_request->copyup_pages;
	rbd_assert(pages != NULL);
	obj_request->copyup_pages = NULL;
	page_count = obj_request->copyup_page_count;
	rbd_assert(page_count);
	obj_request->copyup_page_count = 0;
	ceph_release_page_vector(pages, page_count);

	/*
         * We want the transfer count to reflect the size of the
         * original write request.  There is no such thing as a
         * successful short write, so if the request was successful
         * we can just set it to the originally-requested length.
         */
	if (!obj_request->result)
		obj_request->xferred = obj_request->length;

	obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 131 88.51% 3 60.00%
ilya dryomov ilya dryomov 11 7.43% 1 20.00%
josh durgin josh durgin 6 4.05% 1 20.00%
Total 148 100.00% 5 100.00%


static void

rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request)
{
	struct rbd_obj_request *orig_request;
	struct ceph_osd_request *osd_req;
	struct rbd_device *rbd_dev;
	struct page **pages;
	enum obj_operation_type op_type;
	u32 page_count;
	int img_result;
	u64 parent_length;

	rbd_assert(img_request_child_test(img_request));

	/* First get what we need from the image request */

	pages = img_request->copyup_pages;
	rbd_assert(pages != NULL);
	img_request->copyup_pages = NULL;
	page_count = img_request->copyup_page_count;
	rbd_assert(page_count);
	img_request->copyup_page_count = 0;

	orig_request = img_request->obj_request;
	rbd_assert(orig_request != NULL);
	rbd_assert(obj_request_type_valid(orig_request->type));
	img_result = img_request->result;
	parent_length = img_request->length;
	rbd_assert(img_result || parent_length == img_request->xferred);
	rbd_img_request_put(img_request);

	rbd_assert(orig_request->img_request);
	rbd_dev = orig_request->img_request->rbd_dev;
	rbd_assert(rbd_dev);

	/*
         * If the overlap has become 0 (most likely because the
         * image has been flattened) we need to free the pages
         * and re-submit the original write request.
         */
	if (!rbd_dev->parent_overlap) {
		ceph_release_page_vector(pages, page_count);
		rbd_obj_request_submit(orig_request);
		return;
	}

	if (img_result)
		goto out_err;

	/*
         * The original osd request is of no use to use any more.
         * We need a new one that can hold the three ops in a copyup
         * request.  Allocate the new copyup osd request for the
         * original request, and release the old one.
         */
	img_result = -ENOMEM;
	osd_req = rbd_osd_req_create_copyup(orig_request);
	if (!osd_req)
		goto out_err;
	rbd_osd_req_destroy(orig_request->osd_req);
	orig_request->osd_req = osd_req;
	orig_request->copyup_pages = pages;
	orig_request->copyup_page_count = page_count;

	/* Initialize the copyup op */

	osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup");
	osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0,
						false, false);

	/* Add the other op(s) */

	op_type = rbd_img_request_op_type(orig_request->img_request);
	rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1);

	/* All set, send it off. */

	rbd_obj_request_submit(orig_request);
	return;

out_err:
	ceph_release_page_vector(pages, page_count);
	rbd_obj_request_error(orig_request, img_result);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 290 92.95% 7 63.64%
josh durgin josh durgin 12 3.85% 1 9.09%
ilya dryomov ilya dryomov 10 3.21% 3 27.27%
Total 312 100.00% 11 100.00%

/*
 * Read from the parent image the range of data that covers the
 * entire target of the given object request.  This is used for
 * satisfying a layered image write request when the target of an
 * object request from the image request does not exist.
 *
 * A page array big enough to hold the returned data is allocated
 * and supplied to rbd_img_request_fill() as the "data descriptor."
 * When the read completes, this page array will be transferred to
 * the original object request for the copyup operation.
 *
 * If an error occurs, it is recorded as the result of the original
 * object request in rbd_img_obj_exists_callback().
 */


static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request)
{
	struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev;
	struct rbd_img_request *parent_request = NULL;
	u64 img_offset;
	u64 length;
	struct page **pages = NULL;
	u32 page_count;
	int result;

	rbd_assert(rbd_dev->parent != NULL);

	/*
         * Determine the byte range covered by the object in the
         * child image to which the original request was to be sent.
         */
	img_offset = obj_request->img_offset - obj_request->offset;
	length = (u64)1 << rbd_dev->header.obj_order;

	/*
         * There is no defined parent data beyond the parent
         * overlap, so limit what we read at that boundary if
         * necessary.
         */
	if (img_offset + length > rbd_dev->parent_overlap) {
		rbd_assert(img_offset < rbd_dev->parent_overlap);
		length = rbd_dev->parent_overlap - img_offset;
	}

	/*
         * Allocate a page array big enough to receive the data read
         * from the parent.
         */
	page_count = (u32)calc_pages_for(0, length);
	pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
	if (IS_ERR(pages)) {
		result = PTR_ERR(pages);
		pages = NULL;
		goto out_err;
	}

	result = -ENOMEM;
	parent_request = rbd_parent_request_create(obj_request,
						img_offset, length);
	if (!parent_request)
		goto out_err;

	result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages);
	if (result)
		goto out_err;

	parent_request->copyup_pages = pages;
	parent_request->copyup_page_count = page_count;
	parent_request->callback = rbd_img_obj_parent_read_full_callback;

	result = rbd_img_request_submit(parent_request);
	if (!result)
		return 0;

	parent_request->copyup_pages = NULL;
	parent_request->copyup_page_count = 0;
	parent_request->obj_request = NULL;
	rbd_obj_request_put(obj_request);
out_err:
	if (pages)
		ceph_release_page_vector(pages, page_count);
	if (parent_request)
		rbd_img_request_put(parent_request);
	return result;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 273 97.50% 4 80.00%
ilya dryomov ilya dryomov 7 2.50% 1 20.00%
Total 280 100.00% 5 100.00%



static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request)
{
	struct rbd_obj_request *orig_request;
	struct rbd_device *rbd_dev;
	int result;

	rbd_assert(!obj_request_img_data_test(obj_request));

	/*
         * All we need from the object request is the original
         * request and the result of the STAT op.  Grab those, then
         * we're done with the request.
         */
	orig_request = obj_request->obj_request;
	obj_request->obj_request = NULL;
	rbd_obj_request_put(orig_request);
	rbd_assert(orig_request);
	rbd_assert(orig_request->img_request);

	result = obj_request->result;
	obj_request->result = 0;

	dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__,
		obj_request, orig_request, result,
		obj_request->xferred, obj_request->length);
	rbd_obj_request_put(obj_request);

	/*
         * If the overlap has become 0 (most likely because the
         * image has been flattened) we need to re-submit the
         * original request.
         */
	rbd_dev = orig_request->img_request->rbd_dev;
	if (!rbd_dev->parent_overlap) {
		rbd_obj_request_submit(orig_request);
		return;
	}

	/*
         * Our only purpose here is to determine whether the object
         * exists, and we don't want to treat the non-existence as
         * an error.  If something else comes back, transfer the
         * error to the original request and complete it now.
         */
	if (!result) {
		obj_request_existence_set(orig_request, true);
	} else if (result == -ENOENT) {
		obj_request_existence_set(orig_request, false);
	} else {
		goto fail_orig_request;
	}

	/*
         * Resubmit the original request now that we have recorded
         * whether the target object exists.
         */
	result = rbd_img_obj_request_submit(orig_request);
	if (result)
		goto fail_orig_request;

	return;

fail_orig_request:
	rbd_obj_request_error(orig_request, result);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 176 93.62% 4 57.14%
ilya dryomov ilya dryomov 12 6.38% 3 42.86%
Total 188 100.00% 7 100.00%



static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request)
{
	struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev;
	struct rbd_obj_request *stat_request;
	struct page **pages;
	u32 page_count;
	size_t size;
	int ret;

	stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0,
					      OBJ_REQUEST_PAGES);
	if (!stat_request)
		return -ENOMEM;

	stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1,
						   stat_request);
	if (!stat_request->osd_req) {
		ret = -ENOMEM;
		goto fail_stat_request;
	}

	/*
         * The response data for a STAT call consists of:
         *     le64 length;
         *     struct {
         *         le32 tv_sec;
         *         le32 tv_nsec;
         *     } mtime;
         */
	size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32);
	page_count = (u32)calc_pages_for(0, size);
	pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
	if (IS_ERR(pages)) {
		ret = PTR_ERR(pages);
		goto fail_stat_request;
	}

	osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0);
	osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0,
				     false, false);

	rbd_obj_request_get(obj_request);
	stat_request->obj_request = obj_request;
	stat_request->pages = pages;
	stat_request->page_count = page_count;
	stat_request->callback = rbd_img_obj_exists_callback;

	rbd_obj_request_submit(stat_request);
	return 0;

fail_stat_request:
	rbd_obj_request_put(stat_request);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 138 58.72% 1 25.00%
ilya dryomov ilya dryomov 97 41.28% 3 75.00%
Total 235 100.00% 4 100.00%



static bool img_obj_request_simple(struct rbd_obj_request *obj_request)
{
	struct rbd_img_request *img_request = obj_request->img_request;
	struct rbd_device *rbd_dev = img_request->rbd_dev;

	/* Reads */
	if (!img_request_write_test(img_request) &&
	    !img_request_discard_test(img_request))
		return true;

	/* Non-layered writes */
	if (!img_request_layered_test(img_request))
		return true;

	/*
         * Layered writes outside of the parent overlap range don't
         * share any data with the parent.
         */
	if (!obj_request_overlaps_parent(obj_request))
		return true;

	/*
         * Entire-object layered writes - we will overwrite whatever
         * parent data there is anyway.
         */
	if (!obj_request->offset &&
	    obj_request->length == rbd_obj_bytes(&rbd_dev->header))
		return true;

	/*
         * If the object is known to already exist, its parent data has
         * already been copied.
         */
	if (obj_request_known_test(obj_request) &&
	    obj_request_exists_test(obj_request))
		return true;

	return false;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 42 37.17% 5 50.00%
ilya dryomov ilya dryomov 42 37.17% 3 30.00%
guangliang zhao guangliang zhao 23 20.35% 1 10.00%
josh durgin josh durgin 6 5.31% 1 10.00%
Total 113 100.00% 10 100.00%



static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)
{
	rbd_assert(obj_request_img_data_test(obj_request));
	rbd_assert(obj_request_type_valid(obj_request->type));
	rbd_assert(obj_request->img_request);

	if (img_obj_request_simple(obj_request)) {
		rbd_obj_request_submit(obj_request);
		return 0;
	}

	/*
         * It's a layered write.  The target object might exist but
         * we may not know that yet.  If we know it doesn't exist,
         * start by reading the data for the full target object from
         * the parent so we can use it for a copyup to the target.
         */
	if (obj_request_known_test(obj_request))
		return rbd_img_obj_parent_read_full(obj_request);

	/* We don't know whether the target exists.  Go find out. */

	return rbd_img_obj_exists_submit(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 43 58.11% 3 50.00%
alex elder alex elder 31 41.89% 3 50.00%
Total 74 100.00% 6 100.00%



static int rbd_img_request_submit(struct rbd_img_request *img_request)
{
	struct rbd_obj_request *obj_request;
	struct rbd_obj_request *next_obj_request;
	int ret = 0;

	dout("%s: img %p\n", __func__, img_request);

	rbd_img_request_get(img_request);
	for_each_obj_request_safe(img_request, obj_request, next_obj_request) {
		ret = rbd_img_obj_request_submit(obj_request);
		if (ret)
			goto out_put_ireq;
	}

out_put_ireq:
	rbd_img_request_put(img_request);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 53 71.62% 6 85.71%
ilya dryomov ilya dryomov 21 28.38% 1 14.29%
Total 74 100.00% 7 100.00%



static void rbd_img_parent_read_callback(struct rbd_img_request *img_request)
{
	struct rbd_obj_request *obj_request;
	struct rbd_device *rbd_dev;
	u64 obj_end;
	u64 img_xferred;
	int img_result;

	rbd_assert(img_request_child_test(img_request));

	/* First get what we need from the image request and release it */

	obj_request = img_request->obj_request;
	img_xferred = img_request->xferred;
	img_result = img_request->result;
	rbd_img_request_put(img_request);

	/*
         * If the overlap has become 0 (most likely because the
         * image has been flattened) we need to re-submit the
         * original request.
         */
	rbd_assert(obj_request);
	rbd_assert(obj_request->img_request);
	rbd_dev = obj_request->img_request->rbd_dev;
	if (!rbd_dev->parent_overlap) {
		rbd_obj_request_submit(obj_request);
		return;
	}

	obj_request->result = img_result;
	if (obj_request->result)
		goto out;

	/*
         * We need to zero anything beyond the parent overlap
         * boundary.  Since rbd_img_obj_request_read_callback()
         * will zero anything beyond the end of a short read, an
         * easy way to do this is to pretend the data from the
         * parent came up short--ending at the overlap boundary.
         */
	rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length);
	obj_end = obj_request->img_offset + obj_request->length;
	if (obj_end > rbd_dev->parent_overlap) {
		u64 xferred = 0;

		if (obj_request->img_offset < rbd_dev->parent_overlap)
			xferred = rbd_dev->parent_overlap -
					obj_request->img_offset;

		obj_request->xferred = min(img_xferred, xferred);
	} else {
		obj_request->xferred = img_xferred;
	}
out:
	rbd_img_obj_request_read_callback(obj_request);
	rbd_obj_request_complete(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 204 100.00% 3 100.00%
Total 204 100.00% 3 100.00%



static void rbd_img_parent_read(struct rbd_obj_request *obj_request)
{
	struct rbd_img_request *img_request;
	int result;

	rbd_assert(obj_request_img_data_test(obj_request));
	rbd_assert(obj_request->img_request != NULL);
	rbd_assert(obj_request->result == (s32) -ENOENT);
	rbd_assert(obj_request_type_valid(obj_request->type));

	/* rbd_read_finish(obj_request, obj_request->length); */
	img_request = rbd_parent_request_create(obj_request,
						obj_request->img_offset,
						obj_request->length);
	result = -ENOMEM;
	if (!img_request)
		goto out_err;

	if (obj_request->type == OBJ_REQUEST_BIO)
		result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO,
						obj_request->bio_list);
	else
		result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES,
						obj_request->pages);
	if (result)
		goto out_err;

	img_request->callback = rbd_img_parent_read_callback;
	result = rbd_img_request_submit(img_request);
	if (result)
		goto out_err;

	return;
out_err:
	if (img_request)
		rbd_img_request_put(img_request);
	obj_request->result = result;
	obj_request->xferred = 0;
	obj_request_done_set(obj_request);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 179 100.00% 4 100.00%
Total 179 100.00% 4 100.00%


static const struct rbd_client_id rbd_empty_cid;



static bool rbd_cid_equal(const struct rbd_client_id *lhs,
			  const struct rbd_client_id *rhs)
{
	return lhs->gid == rhs->gid && lhs->handle == rhs->handle;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 33 94.29% 2 66.67%
alex elder alex elder 2 5.71% 1 33.33%
Total 35 100.00% 3 100.00%



static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev)
{
	struct rbd_client_id cid;

	mutex_lock(&rbd_dev->watch_mutex);
	cid.gid = ceph_client_gid(rbd_dev->rbd_client->client);
	cid.handle = rbd_dev->watch_cookie;
	mutex_unlock(&rbd_dev->watch_mutex);
	return cid;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 38 67.86% 2 33.33%
alex elder alex elder 18 32.14% 4 66.67%
Total 56 100.00% 6 100.00%

/*
 * lock_rwsem must be held for write
 */


static void rbd_set_owner_cid(struct rbd_device *rbd_dev,
			      const struct rbd_client_id *cid)
{
	dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev,
	     rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle,
	     cid->gid, cid->handle);
	rbd_dev->owner_cid = *cid; /* struct */
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 45 83.33% 2 50.00%
alex elder alex elder 9 16.67% 2 50.00%
Total 54 100.00% 4 100.00%



static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf)
{
	mutex_lock(&rbd_dev->watch_mutex);
	sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie);
	mutex_unlock(&rbd_dev->watch_mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 38 86.36% 2 66.67%
alex elder alex elder 6 13.64% 1 33.33%
Total 44 100.00% 3 100.00%

/*
 * lock_rwsem must be held for write
 */


static int rbd_lock(struct rbd_device *rbd_dev)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct rbd_client_id cid = rbd_get_cid(rbd_dev);
	char cookie[32];
	int ret;

	WARN_ON(__rbd_is_lock_owner(rbd_dev));

	format_lock_cookie(rbd_dev, cookie);
	ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
			    RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie,
			    RBD_LOCK_TAG, "", 0);
	if (ret)
		return ret;

	rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED;
	rbd_set_owner_cid(rbd_dev, &cid);
	queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 92 74.80% 3 60.00%
alex elder alex elder 31 25.20% 2 40.00%
Total 123 100.00% 5 100.00%

/*
 * lock_rwsem must be held for write
 */


static int rbd_unlock(struct rbd_device *rbd_dev)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	char cookie[32];
	int ret;

	WARN_ON(!__rbd_is_lock_owner(rbd_dev));

	rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED;

	format_lock_cookie(rbd_dev, cookie);
	ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
			      RBD_LOCK_NAME, cookie);
	if (ret && ret != -ENOENT) {
		rbd_warn(rbd_dev, "cls_unlock failed: %d", ret);
		return ret;
	}

	rbd_set_owner_cid(rbd_dev, &rbd_empty_cid);
	queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 123 100.00% 3 100.00%
Total 123 100.00% 3 100.00%



static int __rbd_notify_op_lock(struct rbd_device *rbd_dev,
				enum rbd_notify_op notify_op,
				struct page ***preply_pages,
				size_t *preply_len)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct rbd_client_id cid = rbd_get_cid(rbd_dev);
	int buf_size = 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN;
	char buf[buf_size];
	void *p = buf;

	dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op);

	/* encode *LockPayload NotifyMessage (op + ClientId) */
	ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN);
	ceph_encode_32(&p, notify_op);
	ceph_encode_64(&p, cid.gid);
	ceph_encode_64(&p, cid.handle);

	return ceph_osdc_notify(osdc, &rbd_dev->header_oid,
				&rbd_dev->header_oloc, buf, buf_size,
				RBD_NOTIFY_TIMEOUT, preply_pages, preply_len);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 152 100.00% 1 100.00%
Total 152 100.00% 1 100.00%



static void rbd_notify_op_lock(struct rbd_device *rbd_dev,
			       enum rbd_notify_op notify_op)
{
	struct page **reply_pages;
	size_t reply_len;

	__rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len);
	ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len));
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%



static void rbd_notify_acquired_lock(struct work_struct *work)
{
	struct rbd_device *rbd_dev = container_of(work, struct rbd_device,
						  acquired_lock_work);

	rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static void rbd_notify_released_lock(struct work_struct *work)
{
	struct rbd_device *rbd_dev = container_of(work, struct rbd_device,
						  released_lock_work);

	rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static int rbd_request_lock(struct rbd_device *rbd_dev)
{
	struct page **reply_pages;
	size_t reply_len;
	bool lock_owner_responded = false;
	int ret;

	dout("%s rbd_dev %p\n", __func__, rbd_dev);

	ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK,
				   &reply_pages, &reply_len);
	if (ret && ret != -ETIMEDOUT) {
		rbd_warn(rbd_dev, "failed to request lock: %d", ret);
		goto out;
	}

	if (reply_len > 0 && reply_len <= PAGE_SIZE) {
		void *p = page_address(reply_pages[0]);
		void *const end = p + reply_len;
		u32 n;

		ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */
		while (n--) {
			u8 struct_v;
			u32 len;

			ceph_decode_need(&p, end, 8 + 8, e_inval);
			p += 8 + 8; /* skip gid and cookie */

			ceph_decode_32_safe(&p, end, len, e_inval);
			if (!len)
				continue;

			if (lock_owner_responded) {
				rbd_warn(rbd_dev,
					 "duplicate lock owners detected");
				ret = -EIO;
				goto out;
			}

			lock_owner_responded = true;
			ret = ceph_start_decoding(&p, end, 1, "ResponseMessage",
						  &struct_v, &len);
			if (ret) {
				rbd_warn(rbd_dev,
					 "failed to decode ResponseMessage: %d",
					 ret);
				goto e_inval;
			}

			ret = ceph_decode_32(&p);
		}
	}

	if (!lock_owner_responded) {
		rbd_warn(rbd_dev, "no lock owners detected");
		ret = -ETIMEDOUT;
	}

out:
	ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len));
	return ret;

e_inval:
	ret = -EINVAL;
	goto out;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 293 100.00% 1 100.00%
Total 293 100.00% 1 100.00%



static void wake_requests(struct rbd_device *rbd_dev, bool wake_all)
{
	dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all);

	cancel_delayed_work(&rbd_dev->lock_dwork);
	if (wake_all)
		wake_up_all(&rbd_dev->lock_waitq);
	else
		wake_up(&rbd_dev->lock_waitq);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%



static int get_lock_owner_info(struct rbd_device *rbd_dev,
			       struct ceph_locker **lockers, u32 *num_lockers)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	u8 lock_type;
	char *lock_tag;
	int ret;

	dout("%s rbd_dev %p\n", __func__, rbd_dev);

	ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid,
				 &rbd_dev->header_oloc, RBD_LOCK_NAME,
				 &lock_type, &lock_tag, lockers, num_lockers);
	if (ret)
		return ret;

	if (*num_lockers == 0) {
		dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev);
		goto out;
	}

	if (strcmp(lock_tag, RBD_LOCK_TAG)) {
		rbd_warn(rbd_dev, "locked by external mechanism, tag %s",
			 lock_tag);
		ret = -EBUSY;
		goto out;
	}

	if (lock_type == CEPH_CLS_LOCK_SHARED) {
		rbd_warn(rbd_dev, "shared lock type detected");
		ret = -EBUSY;
		goto out;
	}

	if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX,
		    strlen(RBD_LOCK_COOKIE_PREFIX))) {
		rbd_warn(rbd_dev, "locked by external mechanism, cookie %s",
			 (*lockers)[0].id.cookie);
		ret = -EBUSY;
		goto out;
	}

out:
	kfree(lock_tag);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 225 100.00% 1 100.00%
Total 225 100.00% 1 100.00%



static int find_watcher(struct rbd_device *rbd_dev,
			const struct ceph_locker *locker)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct ceph_watch_item *watchers;
	u32 num_watchers;
	u64 cookie;
	int i;
	int ret;

	ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid,
				      &rbd_dev->header_oloc, &watchers,
				      &num_watchers);
	if (ret)
		return ret;

	sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie);
	for (i = 0; i < num_watchers; i++) {
		if (!memcmp(&watchers[i].addr, &locker->info.addr,
			    sizeof(locker->info.addr)) &&
		    watchers[i].cookie == cookie) {
			struct rbd_client_id cid = {
				.gid = le64_to_cpu(watchers[i].name.num),
				.handle = cookie,
                        };

			dout("%s rbd_dev %p found cid %llu-%llu\n", __func__,
			     rbd_dev, cid.gid, cid.handle);
			rbd_set_owner_cid(rbd_dev, &cid);
			ret = 1;
			goto out;
		}
	}

	dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev);
	ret = 0;
out:
	kfree(watchers);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 230 100.00% 1 100.00%
Total 230 100.00% 1 100.00%

/*
 * lock_rwsem must be held for write
 */


static int rbd_try_lock(struct rbd_device *rbd_dev)
{
	struct ceph_client *client = rbd_dev->rbd_client->client;
	struct ceph_locker *lockers;
	u32 num_lockers;
	int ret;

	for (;;) {
		ret = rbd_lock(rbd_dev);
		if (ret != -EBUSY)
			return ret;

		/* determine if the current lock holder is still alive */
		ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers);
		if (ret)
			return ret;

		if (num_lockers == 0)
			goto again;

		ret = find_watcher(rbd_dev, lockers);
		if (ret) {
			if (ret > 0)
				ret = 0; /* have to request lock */
			goto out;
		}

		rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock",
			 ENTITY_NAME(lockers[0].id.name));

		ret = ceph_monc_blacklist_add(&client->monc,
					      &lockers[0].info.addr);
		if (ret) {
			rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d",
				 ENTITY_NAME(lockers[0].id.name), ret);
			goto out;
		}

		ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid,
					  &rbd_dev->header_oloc, RBD_LOCK_NAME,
					  lockers[0].id.cookie,
					  &lockers[0].id.name);
		if (ret && ret != -ENOENT)
			goto out;

again:
		ceph_free_lockers(lockers, num_lockers);
	}

out:
	ceph_free_lockers(lockers, num_lockers);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 259 100.00% 1 100.00%
Total 259 100.00% 1 100.00%

/*
 * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED
 */


static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev,
						int *pret)
{
	enum rbd_lock_state lock_state;

	down_read(&rbd_dev->lock_rwsem);
	dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev,
	     rbd_dev->lock_state);
	if (__rbd_is_lock_owner(rbd_dev)) {
		lock_state = rbd_dev->lock_state;
		up_read(&rbd_dev->lock_rwsem);
		return lock_state;
	}

	up_read(&rbd_dev->lock_rwsem);
	down_write(&rbd_dev->lock_rwsem);
	dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev,
	     rbd_dev->lock_state);
	if (!__rbd_is_lock_owner(rbd_dev)) {
		*pret = rbd_try_lock(rbd_dev);
		if (*pret)
			rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret);
	}

	lock_state = rbd_dev->lock_state;
	up_write(&rbd_dev->lock_rwsem);
	return lock_state;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 146 100.00% 1 100.00%
Total 146 100.00% 1 100.00%



static void rbd_acquire_lock(struct work_struct *work)
{
	struct rbd_device *rbd_dev = container_of(to_delayed_work(work),
					    struct rbd_device, lock_dwork);
	enum rbd_lock_state lock_state;
	int ret;

	dout("%s rbd_dev %p\n", __func__, rbd_dev);
again:
	lock_state = rbd_try_acquire_lock(rbd_dev, &ret);
	if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) {
		if (lock_state == RBD_LOCK_STATE_LOCKED)
			wake_requests(rbd_dev, true);
		dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__,
		     rbd_dev, lock_state, ret);
		return;
	}

	ret = rbd_request_lock(rbd_dev);
	if (ret == -ETIMEDOUT) {
		goto again; /* treat this as a dead client */
	} else if (ret < 0) {
		rbd_warn(rbd_dev, "error requesting lock: %d", ret);
		mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork,
				 RBD_RETRY_DELAY);
	} else {
		/*
                 * lock owner acked, but resend if we don't see them
                 * release the lock
                 */
		dout("%s rbd_dev %p requeueing lock_dwork\n", __func__,
		     rbd_dev);
		mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork,
		    msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC));
	}
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 183 100.00% 1 100.00%
Total 183 100.00% 1 100.00%

/*
 * lock_rwsem must be held for write
 */


static bool rbd_release_lock(struct rbd_device *rbd_dev)
{
	dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev,
	     rbd_dev->lock_state);
	if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED)
		return false;

	rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING;
	downgrade_write(&rbd_dev->lock_rwsem);
	/*
         * Ensure that all in-flight IO is flushed.
         *
         * FIXME: ceph_osdc_sync() flushes the entire OSD client, which
         * may be shared with other devices.
         */
	ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc);
	up_read(&rbd_dev->lock_rwsem);

	down_write(&rbd_dev->lock_rwsem);
	dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev,
	     rbd_dev->lock_state);
	if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING)
		return false;

	if (!rbd_unlock(rbd_dev))
		/*
                 * Give others a chance to grab the lock - we would re-acquire
                 * almost immediately if we got new IO during ceph_osdc_sync()
                 * otherwise.  We need to ack our own notifications, so this
                 * lock_dwork will be requeued from rbd_wait_state_locked()
                 * after wake_requests() in rbd_handle_released_lock().
                 */
		cancel_delayed_work(&rbd_dev->lock_dwork);

	return true;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 122 100.00% 1 100.00%
Total 122 100.00% 1 100.00%



static void rbd_release_lock_work(struct work_struct *work)
{
	struct rbd_device *rbd_dev = container_of(work, struct rbd_device,
						  unlock_work);

	down_write(&rbd_dev->lock_rwsem);
	rbd_release_lock(rbd_dev);
	up_write(&rbd_dev->lock_rwsem);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%



static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v,
				     void **p)
{
	struct rbd_client_id cid = { 0 };

	if (struct_v >= 2) {
		cid.gid = ceph_decode_64(p);
		cid.handle = ceph_decode_64(p);
	}

	dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid,
	     cid.handle);
	if (!rbd_cid_equal(&cid, &rbd_empty_cid)) {
		down_write(&rbd_dev->lock_rwsem);
		if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) {
			/*
                         * we already know that the remote client is
                         * the owner
                         */
			up_write(&rbd_dev->lock_rwsem);
			return;
		}

		rbd_set_owner_cid(rbd_dev, &cid);
		downgrade_write(&rbd_dev->lock_rwsem);
	} else {
		down_read(&rbd_dev->lock_rwsem);
	}

	if (!__rbd_is_lock_owner(rbd_dev))
		wake_requests(rbd_dev, false);
	up_read(&rbd_dev->lock_rwsem);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 167 100.00% 1 100.00%
Total 167 100.00% 1 100.00%



static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v,
				     void **p)
{
	struct rbd_client_id cid = { 0 };

	if (struct_v >= 2) {
		cid.gid = ceph_decode_64(p);
		cid.handle = ceph_decode_64(p);
	}

	dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid,
	     cid.handle);
	if (!rbd_cid_equal(&cid, &rbd_empty_cid)) {
		down_write(&rbd_dev->lock_rwsem);
		if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) {
			dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n",
			     __func__, rbd_dev, cid.gid, cid.handle,
			     rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle);
			up_write(&rbd_dev->lock_rwsem);
			return;
		}

		rbd_set_owner_cid(rbd_dev, &rbd_empty_cid);
		downgrade_write(&rbd_dev->lock_rwsem);
	} else {
		down_read(&rbd_dev->lock_rwsem);
	}

	if (!__rbd_is_lock_owner(rbd_dev))
		wake_requests(rbd_dev, false);
	up_read(&rbd_dev->lock_rwsem);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 196 100.00% 1 100.00%
Total 196 100.00% 1 100.00%



static bool rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v,
				    void **p)
{
	struct rbd_client_id my_cid = rbd_get_cid(rbd_dev);
	struct rbd_client_id cid = { 0 };
	bool need_to_send;

	if (struct_v >= 2) {
		cid.gid = ceph_decode_64(p);
		cid.handle = ceph_decode_64(p);
	}

	dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid,
	     cid.handle);
	if (rbd_cid_equal(&cid, &my_cid))
		return false;

	down_read(&rbd_dev->lock_rwsem);
	need_to_send = __rbd_is_lock_owner(rbd_dev);
	if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) {
		if (!rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) {
			dout("%s rbd_dev %p queueing unlock_work\n", __func__,
			     rbd_dev);
			queue_work(rbd_dev->task_wq, &rbd_dev->unlock_work);
		}
	}
	up_read(&rbd_dev->lock_rwsem);
	return need_to_send;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 169 100.00% 1 100.00%
Total 169 100.00% 1 100.00%



static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev,
				     u64 notify_id, u64 cookie, s32 *result)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN;
	char buf[buf_size];
	int ret;

	if (result) {
		void *p = buf;

		/* encode ResponseMessage */
		ceph_start_encoding(&p, 1, 1,
				    buf_size - CEPH_ENCODING_START_BLK_LEN);
		ceph_encode_32(&p, *result);
	} else {
		buf_size = 0;
	}

	ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid,
				   &rbd_dev->header_oloc, notify_id, cookie,
				   buf, buf_size);
	if (ret)
		rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 131 99.24% 2 66.67%
alex elder alex elder 1 0.76% 1 33.33%
Total 132 100.00% 3 100.00%



static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id,
				   u64 cookie)
{
	dout("%s rbd_dev %p\n", __func__, rbd_dev);
	__rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev,
					  u64 notify_id, u64 cookie, s32 result)
{
	dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result);
	__rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 43 100.00% 1 100.00%
Total 43 100.00% 1 100.00%



static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie,
			 u64 notifier_id, void *data, size_t data_len)
{
	struct rbd_device *rbd_dev = arg;
	void *p = data;
	void *const end = p + data_len;
	u8 struct_v = 0;
	u32 len;
	u32 notify_op;
	int ret;

	dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n",
	     __func__, rbd_dev, cookie, notify_id, data_len);
	if (data_len) {
		ret = ceph_start_decoding(&p, end, 1, "NotifyMessage",
					  &struct_v, &len);
		if (ret) {
			rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d",
				 ret);
			return;
		}

		notify_op = ceph_decode_32(&p);
	} else {
		/* legacy notification for header updates */
		notify_op = RBD_NOTIFY_OP_HEADER_UPDATE;
		len = 0;
	}

	dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op);
	switch (notify_op) {
	case RBD_NOTIFY_OP_ACQUIRED_LOCK:
		rbd_handle_acquired_lock(rbd_dev, struct_v, &p);
		rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
		break;
	case RBD_NOTIFY_OP_RELEASED_LOCK:
		rbd_handle_released_lock(rbd_dev, struct_v, &p);
		rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
		break;
	case RBD_NOTIFY_OP_REQUEST_LOCK:
		if (rbd_handle_request_lock(rbd_dev, struct_v, &p))
			/*
                         * send ResponseMessage(0) back so the client
                         * can detect a missing owner
                         */
			rbd_acknowledge_notify_result(rbd_dev, notify_id,
						      cookie, 0);
		else
			rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
		break;
	case RBD_NOTIFY_OP_HEADER_UPDATE:
		ret = rbd_dev_refresh(rbd_dev);
		if (ret)
			rbd_warn(rbd_dev, "refresh failed: %d", ret);

		rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
		break;
	default:
		if (rbd_is_lock_owner(rbd_dev))
			rbd_acknowledge_notify_result(rbd_dev, notify_id,
						      cookie, -EOPNOTSUPP);
		else
			rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
		break;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 293 96.38% 3 75.00%
alex elder alex elder 11 3.62% 1 25.00%
Total 304 100.00% 4 100.00%

static void __rbd_unregister_watch(struct rbd_device *rbd_dev);



static void rbd_watch_errcb(void *arg, u64 cookie, int err)
{
	struct rbd_device *rbd_dev = arg;

	rbd_warn(rbd_dev, "encountered watch error: %d", err);

	down_write(&rbd_dev->lock_rwsem);
	rbd_set_owner_cid(rbd_dev, &rbd_empty_cid);
	up_write(&rbd_dev->lock_rwsem);

	mutex_lock(&rbd_dev->watch_mutex);
	if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) {
		__rbd_unregister_watch(rbd_dev);
		rbd_dev->watch_state = RBD_WATCH_STATE_ERROR;

		queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0);
	}
	mutex_unlock(&rbd_dev->watch_mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 74 69.16% 4 57.14%
alex elder alex elder 33 30.84% 3 42.86%
Total 107 100.00% 7 100.00%

/*
 * watch_mutex must be locked
 */


static int __rbd_register_watch(struct rbd_device *rbd_dev)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct ceph_osd_linger_request *handle;

	rbd_assert(!rbd_dev->watch_handle);
	dout("%s rbd_dev %p\n", __func__, rbd_dev);

	handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid,
				 &rbd_dev->header_oloc, rbd_watch_cb,
				 rbd_watch_errcb, rbd_dev);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	rbd_dev->watch_handle = handle;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 92 100.00% 3 100.00%
Total 92 100.00% 3 100.00%

/*
 * watch_mutex must be locked
 */


static void __rbd_unregister_watch(struct rbd_device *rbd_dev)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	int ret;

	rbd_assert(rbd_dev->watch_handle);
	dout("%s rbd_dev %p\n", __func__, rbd_dev);

	ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle);
	if (ret)
		rbd_warn(rbd_dev, "failed to unwatch: %d", ret);

	rbd_dev->watch_handle = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 39 52.70% 1 16.67%
ilya dryomov ilya dryomov 35 47.30% 5 83.33%
Total 74 100.00% 6 100.00%



static int rbd_register_watch(struct rbd_device *rbd_dev)
{
	int ret;

	mutex_lock(&rbd_dev->watch_mutex);
	rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED);
	ret = __rbd_register_watch(rbd_dev);
	if (ret)
		goto out;

	rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED;
	rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id;

out:
	mutex_unlock(&rbd_dev->watch_mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 74 100.00% 4 100.00%
Total 74 100.00% 4 100.00%



static void cancel_tasks_sync(struct rbd_device *rbd_dev)
{
	dout("%s rbd_dev %p\n", __func__, rbd_dev);

	cancel_delayed_work_sync(&rbd_dev->watch_dwork);
	cancel_work_sync(&rbd_dev->acquired_lock_work);
	cancel_work_sync(&rbd_dev->released_lock_work);
	cancel_delayed_work_sync(&rbd_dev->lock_dwork);
	cancel_work_sync(&rbd_dev->unlock_work);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 60 100.00% 3 100.00%
Total 60 100.00% 3 100.00%



static void rbd_unregister_watch(struct rbd_device *rbd_dev)
{
	WARN_ON(waitqueue_active(&rbd_dev->lock_waitq));
	cancel_tasks_sync(rbd_dev);

	mutex_lock(&rbd_dev->watch_mutex);
	if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED)
		__rbd_unregister_watch(rbd_dev);
	rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED;
	mutex_unlock(&rbd_dev->watch_mutex);

	ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 74 100.00% 4 100.00%
Total 74 100.00% 4 100.00%



static void rbd_reregister_watch(struct work_struct *work)
{
	struct rbd_device *rbd_dev = container_of(to_delayed_work(work),
					    struct rbd_device, watch_dwork);
	bool was_lock_owner = false;
	bool need_to_wake = false;
	int ret;

	dout("%s rbd_dev %p\n", __func__, rbd_dev);

	down_write(&rbd_dev->lock_rwsem);
	if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED)
		was_lock_owner = rbd_release_lock(rbd_dev);

	mutex_lock(&rbd_dev->watch_mutex);
	if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) {
		mutex_unlock(&rbd_dev->watch_mutex);
		goto out;
	}

	ret = __rbd_register_watch(rbd_dev);
	if (ret) {
		rbd_warn(rbd_dev, "failed to reregister watch: %d", ret);
		if (ret == -EBLACKLISTED || ret == -ENOENT) {
			set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags);
			need_to_wake = true;
		} else {
			queue_delayed_work(rbd_dev->task_wq,
					   &rbd_dev->watch_dwork,
					   RBD_RETRY_DELAY);
		}
		mutex_unlock(&rbd_dev->watch_mutex);
		goto out;
	}

	need_to_wake = true;
	rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED;
	rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id;
	mutex_unlock(&rbd_dev->watch_mutex);

	ret = rbd_dev_refresh(rbd_dev);
	if (ret)
		rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret);

	if (was_lock_owner) {
		ret = rbd_try_lock(rbd_dev);
		if (ret)
			rbd_warn(rbd_dev, "reregisteration lock failed: %d",
				 ret);
	}

out:
	up_write(&rbd_dev->lock_rwsem);
	if (need_to_wake)
		wake_requests(rbd_dev, true);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 260 94.20% 11 91.67%
alex elder alex elder 16 5.80% 1 8.33%
Total 276 100.00% 12 100.00%

/*
 * Synchronous osd object method call.  Returns the number of bytes
 * returned in the outbound buffer, or a negative error code.
 */


static int rbd_obj_method_sync(struct rbd_device *rbd_dev,
			     const char *object_name,
			     const char *class_name,
			     const char *method_name,
			     const void *outbound,
			     size_t outbound_size,
			     void *inbound,
			     size_t inbound_size)
{
	struct rbd_obj_request *obj_request;
	struct page **pages;
	u32 page_count;
	int ret;

	/*
         * Method calls are ultimately read operations.  The result
         * should placed into the inbound buffer provided.  They
         * also supply outbound data--parameters for the object
         * method.  Currently if this is present it will be a
         * snapshot id.
         */
	page_count = (u32)calc_pages_for(0, inbound_size);
	pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
	if (IS_ERR(pages))
		return PTR_ERR(pages);

	ret = -ENOMEM;
	obj_request = rbd_obj_request_create(object_name, 0, inbound_size,
							OBJ_REQUEST_PAGES);
	if (!obj_request)
		goto out;

	obj_request->pages = pages;
	obj_request->page_count = page_count;

	obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1,
						  obj_request);
	if (!obj_request->osd_req)
		goto out;

	osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL,
					class_name, method_name);
	if (outbound_size) {
		struct ceph_pagelist *pagelist;

		pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
		if (!pagelist)
			goto out;

		ceph_pagelist_init(pagelist);
		ceph_pagelist_append(pagelist, outbound, outbound_size);
		osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0,
						pagelist);
	}
	osd_req_op_cls_response_data_pages(obj_request->osd_req, 0,
					obj_request->pages, inbound_size,
					0, false, false);

	rbd_obj_request_submit(obj_request);
	ret = rbd_obj_request_wait(obj_request);
	if (ret)
		goto out;

	ret = obj_request->result;
	if (ret < 0)
		goto out;

	rbd_assert(obj_request->xferred < (u64)INT_MAX);
	ret = (int)obj_request->xferred;
	ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred);
out:
	if (obj_request)
		rbd_obj_request_put(obj_request);
	else
		ceph_release_page_vector(pages, page_count);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 336 99.12% 12 85.71%
ilya dryomov ilya dryomov 2 0.59% 1 7.14%
guangliang zhao guangliang zhao 1 0.29% 1 7.14%
Total 339 100.00% 14 100.00%

/*
 * lock_rwsem must be held for read
 */


static void rbd_wait_state_locked(struct rbd_device *rbd_dev)
{
	DEFINE_WAIT(wait);

	do {
		/*
                 * Note the use of mod_delayed_work() in rbd_acquire_lock()
                 * and cancel_delayed_work() in wake_requests().
                 */
		dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev);
		queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0);
		prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait,
					  TASK_UNINTERRUPTIBLE);
		up_read(&rbd_dev->lock_rwsem);
		schedule();
		down_read(&rbd_dev->lock_rwsem);
	} while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED &&
		 !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags));

	finish_wait(&rbd_dev->lock_waitq, &wait);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 105 99.06% 2 66.67%
alex elder alex elder 1 0.94% 1 33.33%
Total 106 100.00% 3 100.00%



static void rbd_queue_workfn(struct work_struct *work)
{
	struct request *rq = blk_mq_rq_from_pdu(work);
	struct rbd_device *rbd_dev = rq->q->queuedata;
	struct rbd_img_request *img_request;
	struct ceph_snap_context *snapc = NULL;
	u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT;
	u64 length = blk_rq_bytes(rq);
	enum obj_operation_type op_type;
	u64 mapping_size;
	bool must_be_locked;
	int result;

	if (rq->cmd_type != REQ_TYPE_FS) {
		dout("%s: non-fs request type %d\n", __func__,
			(int) rq->cmd_type);
		result = -EIO;
		goto err;
	}

	if (req_op(rq) == REQ_OP_DISCARD)
		op_type = OBJ_OP_DISCARD;
	else if (req_op(rq) == REQ_OP_WRITE)
		op_type = OBJ_OP_WRITE;
	else
		op_type = OBJ_OP_READ;

	/* Ignore/skip any zero-length requests */

	if (!length) {
		dout("%s: zero-length request\n", __func__);
		result = 0;
		goto err_rq;
	}

	/* Only reads are allowed to a read-only device */

	if (op_type != OBJ_OP_READ) {
		if (rbd_dev->mapping.read_only) {
			result = -EROFS;
			goto err_rq;
		}
		rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP);
	}

	/*
         * Quit early if the mapped snapshot no longer exists.  It's
         * still possible the snapshot will have disappeared by the
         * time our request arrives at the osd, but there's no sense in
         * sending it if we already know.
         */
	if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) {
		dout("request for non-existent snapshot");
		rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
		result = -ENXIO;
		goto err_rq;
	}

	if (offset && length > U64_MAX - offset + 1) {
		rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset,
			 length);
		result = -EINVAL;
		goto err_rq;	/* Shouldn't happen */
	}

	blk_mq_start_request(rq);

	down_read(&rbd_dev->header_rwsem);
	mapping_size = rbd_dev->mapping.size;
	if (op_type != OBJ_OP_READ) {
		snapc = rbd_dev->header.snapc;
		ceph_get_snap_context(snapc);
		must_be_locked = rbd_is_lock_supported(rbd_dev);
	} else {
		must_be_locked = rbd_dev->opts->lock_on_read &&
					rbd_is_lock_supported(rbd_dev);
	}
	up_read(&rbd_dev->header_rwsem);

	if (offset + length > mapping_size) {
		rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset,
			 length, mapping_size);
		result = -EIO;
		goto err_rq;
	}

	if (must_be_locked) {
		down_read(&rbd_dev->lock_rwsem);
		if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED &&
		    !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags))
			rbd_wait_state_locked(rbd_dev);

		WARN_ON((rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) ^
			!test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags));
		if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) {
			result = -EBLACKLISTED;
			goto err_unlock;
		}
	}

	img_request = rbd_img_request_create(rbd_dev, offset, length, op_type,
					     snapc);
	if (!img_request) {
		result = -ENOMEM;
		goto err_unlock;
	}
	img_request->rq = rq;
	snapc = NULL; /* img_request consumes a ref */

	if (op_type == OBJ_OP_DISCARD)
		result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA,
					      NULL);
	else
		result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO,
					      rq->bio);
	if (result)
		goto err_img_request;

	result = rbd_img_request_submit(img_request);
	if (result)
		goto err_img_request;

	if (must_be_locked)
		up_read(&rbd_dev->lock_rwsem);
	return;

err_img_request:
	rbd_img_request_put(img_request);
err_unlock:
	if (must_be_locked)
		up_read(&rbd_dev->lock_rwsem);
err_rq:
	if (result)
		rbd_warn(rbd_dev, "%s %llx at %llx result %d",
			 obj_op_name(op_type), length, offset, result);
	ceph_put_snap_context(snapc);
err:
	blk_mq_end_request(rq, result);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 199 31.74% 14 48.28%
ilya dryomov ilya dryomov 195 31.10% 5 17.24%
josh durgin josh durgin 75 11.96% 3 10.34%
christoph hellwig christoph hellwig 61 9.73% 1 3.45%
guangliang zhao guangliang zhao 60 9.57% 3 10.34%
yehuda sadeh yehuda sadeh 27 4.31% 2 6.90%
michael christie michael christie 10 1.59% 1 3.45%
Total 627 100.00% 29 100.00%



static int rbd_queue_rq(struct blk_mq_hw_ctx *hctx,
		const struct blk_mq_queue_data *bd)
{
	struct request *rq = bd->rq;
	struct work_struct *work = blk_mq_rq_to_pdu(rq);

	queue_work(rbd_wq, work);
	return BLK_MQ_RQ_QUEUE_OK;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 25 54.35% 2 50.00%
christoph hellwig christoph hellwig 20 43.48% 1 25.00%
alex elder alex elder 1 2.17% 1 25.00%
Total 46 100.00% 4 100.00%



static void rbd_free_disk(struct rbd_device *rbd_dev)
{
	struct gendisk *disk = rbd_dev->disk;

	if (!disk)
		return;

	rbd_dev->disk = NULL;
	if (disk->flags & GENHD_FL_UP) {
		del_gendisk(disk);
		if (disk->queue)
			blk_cleanup_queue(disk->queue);
		blk_mq_free_tag_set(&rbd_dev->tag_set);
	}
	put_disk(disk);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 57 78.08% 1 33.33%
alex elder alex elder 8 10.96% 1 33.33%
christoph hellwig christoph hellwig 8 10.96% 1 33.33%
Total 73 100.00% 3 100.00%



static int rbd_obj_read_sync(struct rbd_device *rbd_dev,
				const char *object_name,
				u64 offset, u64 length, void *buf)

{
	struct rbd_obj_request *obj_request;
	struct page **pages = NULL;
	u32 page_count;
	size_t size;
	int ret;

	page_count = (u32) calc_pages_for(offset, length);
	pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
	if (IS_ERR(pages))
		return PTR_ERR(pages);

	ret = -ENOMEM;
	obj_request = rbd_obj_request_create(object_name, offset, length,
							OBJ_REQUEST_PAGES);
	if (!obj_request)
		goto out;

	obj_request->pages = pages;
	obj_request->page_count = page_count;

	obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1,
						  obj_request);
	if (!obj_request->osd_req)
		goto out;

	osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ,
					offset, length, 0, 0);
	osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0,
					obj_request->pages,
					obj_request->length,
					obj_request->offset & ~PAGE_MASK,
					false, false);

	rbd_obj_request_submit(obj_request);
	ret = rbd_obj_request_wait(obj_request);
	if (ret)
		goto out;

	ret = obj_request->result;
	if (ret < 0)
		goto out;

	rbd_assert(obj_request->xferred <= (u64) SIZE_MAX);
	size = (size_t) obj_request->xferred;
	ceph_copy_from_page_vector(pages, buf, 0, size);
	rbd_assert(size <= (size_t)INT_MAX);
	ret = (int)size;
out:
	if (obj_request)
		rbd_obj_request_put(obj_request);
	else
		ceph_release_page_vector(pages, page_count);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 292 98.32% 10 76.92%
ilya dryomov ilya dryomov 2 0.67% 1 7.69%
jan kara jan kara 2 0.67% 1 7.69%
guangliang zhao guangliang zhao 1 0.34% 1 7.69%
Total 297 100.00% 13 100.00%

/*
 * Read the complete header for the given rbd device.  On successful
 * return, the rbd_dev->header field will contain up-to-date
 * information about the image.
 */


static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev)
{
	struct rbd_image_header_ondisk *ondisk = NULL;
	u32 snap_count = 0;
	u64 names_size = 0;
	u32 want_count;
	int ret;

	/*
         * The complete header will include an array of its 64-bit
         * snapshot ids, followed by the names of those snapshots as
         * a contiguous block of NUL-terminated strings.  Note that
         * the number of snapshots could change by the time we read
         * it in, in which case we re-read it.
         */
	do {
		size_t size;

		kfree(ondisk);

		size = sizeof (*ondisk);
		size += snap_count * sizeof (struct rbd_image_snap_ondisk);
		size += names_size;
		ondisk = kmalloc(size, GFP_KERNEL);
		if (!ondisk)
			return -ENOMEM;

		ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_oid.name,
				       0, size, ondisk);
		if (ret < 0)
			goto out;
		if ((size_t)ret < size) {
			ret = -ENXIO;
			rbd_warn(rbd_dev, "short header read (want %zd got %d)",
				size, ret);
			goto out;
		}
		if (!rbd_dev_ondisk_valid(ondisk)) {
			ret = -ENXIO;
			rbd_warn(rbd_dev, "invalid header");
			goto out;
		}

		names_size = le64_to_cpu(ondisk->snap_names_len);
		want_count = snap_count;
		snap_count = le32_to_cpu(ondisk->snap_count);
	} while (snap_count != want_count);

	ret = rbd_header_from_disk(rbd_dev, ondisk);
out:
	kfree(ondisk);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 120 55.30% 8 57.14%
yehuda sadeh yehuda sadeh 85 39.17% 3 21.43%
josh durgin josh durgin 8 3.69% 1 7.14%
ilya dryomov ilya dryomov 3 1.38% 1 7.14%
xi wang xi wang 1 0.46% 1 7.14%
Total 217 100.00% 14 100.00%

/*
 * Clear the rbd device's EXISTS flag if the snapshot it's mapped to
 * has disappeared from the (just updated) snapshot context.
 */


static void rbd_exists_validate(struct rbd_device *rbd_dev)
{
	u64 snap_id;

	if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags))
		return;

	snap_id = rbd_dev->spec->snap_id;
	if (snap_id == CEPH_NOSNAP)
		return;

	if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX)
		clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 64 100.00% 1 100.00%
Total 64 100.00% 1 100.00%



static void rbd_dev_update_size(struct rbd_device *rbd_dev)
{
	sector_t size;

	/*
         * If EXISTS is not set, rbd_dev->disk may be NULL, so don't
         * try to update its size.  If REMOVING is set, updating size
         * is just useless work since the device can't be opened.
         */
	if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) &&
	    !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) {
		size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
		dout("setting size to %llu sectors", (unsigned long long)size);
		set_capacity(rbd_dev->disk, size);
		revalidate_disk(rbd_dev->disk);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
josh durgin josh durgin 72 88.89% 1 50.00%
ilya dryomov ilya dryomov 9 11.11% 1 50.00%
Total 81 100.00% 2 100.00%



static int rbd_dev_refresh(struct rbd_device *rbd_dev)
{
	u64 mapping_size;
	int ret;

	down_write(&rbd_dev->header_rwsem);
	mapping_size = rbd_dev->mapping.size;

	ret = rbd_dev_header_info(rbd_dev);
	if (ret)
		goto out;

	/*
         * If there is a parent, see if it has disappeared due to the
         * mapped image getting flattened.
         */
	if (rbd_dev->parent) {
		ret = rbd_dev_v2_parent_info(rbd_dev);
		if (ret)
			goto out;
	}

	if (rbd_dev->spec->snap_id == CEPH_NOSNAP) {
		rbd_dev->mapping.size = rbd_dev->header.image_size;
	} else {
		/* validate mapped snapshot's EXISTS flag */
		rbd_exists_validate(rbd_dev);
	}

out:
	up_write(&rbd_dev->header_rwsem);
	if (!ret && mapping_size != rbd_dev->mapping.size)
		rbd_dev_update_size(rbd_dev);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 68 50.75% 9 60.00%
ilya dryomov ilya dryomov 65 48.51% 5 33.33%
josh durgin josh durgin 1 0.75% 1 6.67%
Total 134 100.00% 15 100.00%



static int rbd_init_request(void *data, struct request *rq,
		unsigned int hctx_idx, unsigned int request_idx,
		unsigned int numa_node)
{
	struct work_struct *work = blk_mq_rq_to_pdu(rq);

	INIT_WORK(work, rbd_queue_workfn);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
christoph hellwig christoph hellwig 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%


static struct blk_mq_ops rbd_mq_ops = {
	.queue_rq	= rbd_queue_rq,
	.init_request	= rbd_init_request,
};



static int rbd_init_disk(struct rbd_device *rbd_dev)
{
	struct gendisk *disk;
	struct request_queue *q;
	u64 segment_size;
	int err;

	/* create gendisk info */
	disk = alloc_disk(single_major ?
			  (1 << RBD_SINGLE_MAJOR_PART_SHIFT) :
			  RBD_MINORS_PER_MAJOR);
	if (!disk)
		return -ENOMEM;

	snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d",
		 rbd_dev->dev_id);
	disk->major = rbd_dev->major;
	disk->first_minor = rbd_dev->minor;
	if (single_major)
		disk->flags |= GENHD_FL_EXT_DEVT;
	disk->fops = &rbd_bd_ops;
	disk->private_data = rbd_dev;

	memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set));
	rbd_dev->tag_set.ops = &rbd_mq_ops;
	rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth;
	rbd_dev->tag_set.numa_node = NUMA_NO_NODE;
	rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE;
	rbd_dev->tag_set.nr_hw_queues = 1;
	rbd_dev->tag_set.cmd_size = sizeof(struct work_struct);

	err = blk_mq_alloc_tag_set(&rbd_dev->tag_set);
	if (err)
		goto out_disk;

	q = blk_mq_init_queue(&rbd_dev->tag_set);
	if (IS_ERR(q)) {
		err = PTR_ERR(q);
		goto out_tag_set;
	}

	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
	/* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */

	/* set io sizes to object size */
	segment_size = rbd_obj_bytes(&rbd_dev->header);
	blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE);
	q->limits.max_sectors = queue_max_hw_sectors(q);
	blk_queue_max_segments(q, segment_size / SECTOR_SIZE);
	blk_queue_max_segment_size(q, segment_size);
	blk_queue_io_min(q, segment_size);
	blk_queue_io_opt(q, segment_size);

	/* enable the discard support */
	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
	q->limits.discard_granularity = segment_size;
	q->limits.discard_alignment = segment_size;
	blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE);
	q->limits.discard_zeroes_data = 1;

	if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC))
		q->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES;

	disk->queue = q;

	q->queuedata = rbd_dev;

	rbd_dev->disk = disk;

	return 0;
out_tag_set:
	blk_mq_free_tag_set(&rbd_dev->tag_set);
out_disk:
	put_disk(disk);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
christoph hellwig christoph hellwig 117 28.75% 1 5.26%
yehuda sadeh yehuda sadeh 116 28.50% 1 5.26%
ilya dryomov ilya dryomov 51 12.53% 7 36.84%
josh durgin josh durgin 42 10.32% 2 10.53%
guangliang zhao guangliang zhao 24 5.90% 1 5.26%
alex elder alex elder 23 5.65% 4 21.05%
ronny hegewald ronny hegewald 22 5.41% 1 5.26%
sage weil sage weil 8 1.97% 1 5.26%
jens axboe jens axboe 4 0.98% 1 5.26%
Total 407 100.00% 19 100.00%

/*
  sysfs
*/



static struct rbd_device *dev_to_rbd_dev(struct device *dev)
{
	return container_of(dev, struct rbd_device, dev);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static ssize_t rbd_size_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%llu\n",
		(unsigned long long)rbd_dev->mapping.size);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 43 87.76% 2 40.00%
alex elder alex elder 5 10.20% 2 40.00%
josh durgin josh durgin 1 2.04% 1 20.00%
Total 49 100.00% 5 100.00%

/*
 * Note this shows the features for whatever's mapped, which is not
 * necessarily the base image.
 */


static ssize_t rbd_features_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "0x%016llx\n",
			(unsigned long long)rbd_dev->mapping.features);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%



static ssize_t rbd_major_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	if (rbd_dev->major)
		return sprintf(buf, "%d\n", rbd_dev->major);

	return sprintf(buf, "(none)\n");
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 41 73.21% 2 50.00%
alex elder alex elder 15 26.79% 2 50.00%
Total 56 100.00% 4 100.00%



static ssize_t rbd_minor_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%d\n", rbd_dev->minor);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 42 100.00% 1 100.00%
Total 42 100.00% 1 100.00%



static ssize_t rbd_client_addr_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
	struct ceph_entity_addr *client_addr =
	    ceph_client_addr(rbd_dev->rbd_client->client);

	return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr,
		       le32_to_cpu(client_addr->nonce));
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 38 59.38% 1 50.00%
ilya dryomov ilya dryomov 26 40.62% 1 50.00%
Total 64 100.00% 2 100.00%



static ssize_t rbd_client_id_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "client%lld\n",
		       ceph_client_gid(rbd_dev->rbd_client->client));
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 41 87.23% 2 33.33%
alex elder alex elder 5 10.64% 3 50.00%
ilya dryomov ilya dryomov 1 2.13% 1 16.67%
Total 47 100.00% 6 100.00%



static ssize_t rbd_cluster_fsid_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 39 82.98% 1 50.00%
michael christie michael christie 8 17.02% 1 50.00%
Total 47 100.00% 2 100.00%



static ssize_t rbd_config_info_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%s\n", rbd_dev->config_info);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 38 90.48% 2 50.00%
michael christie michael christie 3 7.14% 1 25.00%
alex elder alex elder 1 2.38% 1 25.00%
Total 42 100.00% 4 100.00%



static ssize_t rbd_pool_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%s\n", rbd_dev->spec->pool_name);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 41 93.18% 1 33.33%
alex elder alex elder 3 6.82% 2 66.67%
Total 44 100.00% 3 100.00%



static ssize_t rbd_pool_id_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%llu\n",
			(unsigned long long) rbd_dev->spec->pool_id);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 49 100.00% 3 100.00%
Total 49 100.00% 3 100.00%



static ssize_t rbd_name_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	if (rbd_dev->spec->image_name)
		return sprintf(buf, "%s\n", rbd_dev->spec->image_name);

	return sprintf(buf, "(unknown)\n");
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 40 66.67% 1 20.00%
alex elder alex elder 20 33.33% 4 80.00%
Total 60 100.00% 5 100.00%



static ssize_t rbd_image_id_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%s\n", rbd_dev->spec->image_id);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 44 100.00% 2 100.00%
Total 44 100.00% 2 100.00%

/*
 * Shows the name of the currently-mapped snapshot (or
 * RBD_SNAP_HEAD_NAME for the base image).
 */


static ssize_t rbd_snap_show(struct device *dev,
			     struct device_attribute *attr,
			     char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%s\n", rbd_dev->spec->snap_name);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 41 93.18% 1 33.33%
alex elder alex elder 3 6.82% 2 66.67%
Total 44 100.00% 3 100.00%



static ssize_t rbd_snap_id_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);

	return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id);
}

Contributors
Person Tokens Prop Commits CommitProp
michael christie michael christie 44 100.00% 1 100.00%
Total 44 100.00% 1 100.00%

/*
 * For a v2 image, shows the chain of parent images, separated by empty
 * lines.  For v1 images or if there is no parent, shows "(no parent
 * image)".
 */


static ssize_t rbd_parent_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
	ssize_t count = 0;

	if (!rbd_dev->parent)
		return sprintf(buf, "(no parent image)\n");

	for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) {
		struct rbd_spec *spec = rbd_dev->parent_spec;

		count += sprintf(&buf[count], "%s"
			    "pool_id %llu\npool_name %s\n"
			    "image_id %s\nimage_name %s\n"
			    "snap_id %llu\nsnap_name %s\n"
			    "overlap %llu\n",
			    !count ? "" : "\n", /* first? */
			    spec->pool_id, spec->pool_name,
			    spec->image_id, spec->image_name ?: "(unknown)",
			    spec->snap_id, spec->snap_name,
			    rbd_dev->parent_overlap);
	}

	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 86 64.66% 1 50.00%
ilya dryomov ilya dryomov 47 35.34% 1 50.00%
Total 133 100.00% 2 100.00%



static ssize_t rbd_image_refresh(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf,
				 size_t size)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
	int ret;

	ret = rbd_dev_refresh(rbd_dev);
	if (ret)
		return ret;

	return size;
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 44 81.48% 1 16.67%
alex elder alex elder 8 14.81% 4 66.67%
ilya dryomov ilya dryomov 2 3.70% 1 16.67%
Total 54 100.00% 6 100.00%

static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL);
static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL);
static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL);
static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL);
static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL);
static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL);
static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL);
static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL);
static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL);
static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL);
static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL);
static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL);
static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh);
static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL);
static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL);
static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL);


static struct attribute *rbd_attrs[] = {
	&dev_attr_size.attr,
	&dev_attr_features.attr,
	&dev_attr_major.attr,
	&dev_attr_minor.attr,
	&dev_attr_client_addr.attr,
	&dev_attr_client_id.attr,
	&dev_attr_cluster_fsid.attr,
	&dev_attr_config_info.attr,
	&dev_attr_pool.attr,
	&dev_attr_pool_id.attr,
	&dev_attr_name.attr,
	&dev_attr_image_id.attr,
	&dev_attr_current_snap.attr,
	&dev_attr_snap_id.attr,
	&dev_attr_parent.attr,
	&dev_attr_refresh.attr,
	NULL
};


static struct attribute_group rbd_attr_group = {
	.attrs = rbd_attrs,
};


static const struct attribute_group *rbd_attr_groups[] = {
	&rbd_attr_group,
	NULL
};

static void rbd_dev_release(struct device *dev);


static struct device_type rbd_device_type = {
	.name		= "rbd",
	.groups		= rbd_attr_groups,
	.release	= rbd_dev_release,
};



static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec)
{
	kref_get(&spec->kref);

	return spec;
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 12 50.00% 1 50.00%
alex elder alex elder 12 50.00% 1 50.00%
Total 24 100.00% 2 100.00%

static void rbd_spec_free(struct kref *kref);


static void rbd_spec_put(struct rbd_spec *spec)
{
	if (spec)
		kref_put(&spec->kref, rbd_spec_free);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 23 92.00% 1 50.00%
yehuda sadeh yehuda sadeh 2 8.00% 1 50.00%
Total 25 100.00% 2 100.00%



static struct rbd_spec *rbd_spec_alloc(void)
{
	struct rbd_spec *spec;

	spec = kzalloc(sizeof (*spec), GFP_KERNEL);
	if (!spec)
		return NULL;

	spec->pool_id = CEPH_NOPOOL;
	spec->snap_id = CEPH_NOSNAP;
	kref_init(&spec->kref);

	return spec;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 33 55.93% 1 33.33%
yehuda sadeh yehuda sadeh 14 23.73% 1 33.33%
ilya dryomov ilya dryomov 12 20.34% 1 33.33%
Total 59 100.00% 3 100.00%



static void rbd_spec_free(struct kref *kref)
{
	struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref);

	kfree(spec->pool_name);
	kfree(spec->image_id);
	kfree(spec->image_name);
	kfree(spec->snap_name);
	kfree(spec);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 55 93.22% 3 75.00%
yehuda sadeh yehuda sadeh 4 6.78% 1 25.00%
Total 59 100.00% 4 100.00%



static void rbd_dev_free(struct rbd_device *rbd_dev)
{
	WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED);
	WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED);

	ceph_oid_destroy(&rbd_dev->header_oid);
	ceph_oloc_destroy(&rbd_dev->header_oloc);
	kfree(rbd_dev->config_info);

	rbd_put_client(rbd_dev->rbd_client);
	rbd_spec_put(rbd_dev->spec);
	kfree(rbd_dev->opts);
	kfree(rbd_dev);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 53 67.95% 6 54.55%
alex elder alex elder 16 20.51% 3 27.27%
michael christie michael christie 5 6.41% 1 9.09%
yehuda sadeh yehuda sadeh 4 5.13% 1 9.09%
Total 78 100.00% 11 100.00%



static void rbd_dev_release(struct device *dev)
{
	struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
	bool need_put = !!rbd_dev->opts;

	if (need_put) {
		destroy_workqueue(rbd_dev->task_wq);
		ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id);
	}

	rbd_dev_free(rbd_dev);

	/*
         * This is racy, but way better than putting module outside of
         * the release callback.  The race window is pretty small, so
         * doing something similar to dm (dm-builtin.c) is overkill.
         */
	if (need_put)
		module_put(THIS_MODULE);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 68 100.00% 4 100.00%
Total 68 100.00% 4 100.00%



static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc,
					   struct rbd_spec *spec)
{
	struct rbd_device *rbd_dev;

	rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL);
	if (!rbd_dev)
		return NULL;

	spin_lock_init(&rbd_dev->lock);
	INIT_LIST_HEAD(&rbd_dev->node);
	init_rwsem(&rbd_dev->header_rwsem);

	ceph_oid_init(&rbd_dev->header_oid);
	ceph_oloc_init(&rbd_dev->header_oloc);

	mutex_init(&rbd_dev->watch_mutex);
	rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED;
	INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch);

	init_rwsem(&rbd_dev->lock_rwsem);
	rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED;
	INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock);
	INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock);
	INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock);
	INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work);
	init_waitqueue_head(&rbd_dev->lock_waitq);

	rbd_dev->dev.bus = &rbd_bus_type;
	rbd_dev->dev.type = &rbd_device_type;
	rbd_dev->dev.parent = &rbd_root_dev;
	device_initialize(&rbd_dev->dev);

	rbd_dev->rbd_client = rbdc;
	rbd_dev->spec = spec;

	rbd_dev->layout.stripe_unit = 1 << RBD_MAX_OBJ_ORDER;
	rbd_dev->layout.stripe_count = 1;
	rbd_dev->layout.object_size = 1 << RBD_MAX_OBJ_ORDER;
	rbd_dev->layout.pool_id = spec->pool_id;
	RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL);

	return rbd_dev;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 129 47.96% 6 40.00%
ilya dryomov ilya dryomov 127 47.21% 7 46.67%
zhen yan zhen yan 13 4.83% 2 13.33%
Total 269 100.00% 15 100.00%

/*
 * Create a mapping rbd_dev.
 */


static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
					 struct rbd_spec *spec,
					 struct rbd_options *opts)
{
	struct rbd_device *rbd_dev;

	rbd_dev = __rbd_dev_create(rbdc, spec);
	if (!rbd_dev)
		return NULL;

	rbd_dev->opts = opts;

	/* get an id and fill in device name */
	rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0,
					 minor_to_rbd_dev_id(1 << MINORBITS),
					 GFP_KERNEL);
	if (rbd_dev->dev_id < 0)
		goto fail_rbd_dev;

	sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id);
	rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM,
						   rbd_dev->name);
	if (!rbd_dev->task_wq)
		goto fail_dev_id;

	/* we have a ref from do_rbd_add() */
	__module_get(THIS_MODULE);

	dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id);
	return rbd_dev;

fail_dev_id:
	ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id);
fail_rbd_dev:
	rbd_dev_free(rbd_dev);
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 158 94.61% 2 28.57%
alex elder alex elder 6 3.59% 4 57.14%
zhen yan zhen yan 3 1.80% 1 14.29%
Total 167 100.00% 7 100.00%



static void rbd_dev_destroy(struct rbd_device *rbd_dev)
{
	if (rbd_dev)
		put_device(&rbd_dev->dev);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 10 43.48% 1 25.00%
ilya dryomov ilya dryomov 7 30.43% 2 50.00%
alex elder alex elder 6 26.09% 1 25.00%
Total 23 100.00% 4 100.00%

/*
 * Get the size and object order for an image snapshot, or if
 * snap_id is CEPH_NOSNAP, gets this information for the base
 * image.
 */


static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
				u8 *order, u64 *snap_size)
{
	__le64 snapid = cpu_to_le64(snap_id);
	int ret;
	struct {
		u8 order;
		__le64 size;
	} __attribute__ ((packed)) size_buf = { 0 };

	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
				"rbd", "get_size",
				&snapid, sizeof (snapid),
				&size_buf, sizeof (size_buf));
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret < 0)
		return ret;
	if (ret < sizeof (size_buf))
		return -ERANGE;

	if (order) {
		*order = size_buf.order;
		dout("  order %u", (unsigned int)*order);
	}
	*snap_size = le64_to_cpu(size_buf.size);

	dout("  snap_id 0x%016llx snap_size = %llu\n",
		(unsigned long long)snap_id,
		(unsigned long long)*snap_size);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 137 77.84% 5 62.50%
yehuda sadeh yehuda sadeh 21 11.93% 1 12.50%
josh durgin josh durgin 15 8.52% 1 12.50%
ilya dryomov ilya dryomov 3 1.70% 1 12.50%
Total 176 100.00% 8 100.00%



static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev)
{
	return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP,
					&rbd_dev->header.obj_order,
					&rbd_dev->header.image_size);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
{
	void *reply_buf;
	int ret;
	void *p;

	reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL);
	if (!reply_buf)
		return -ENOMEM;

	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
				"rbd", "get_object_prefix", NULL, 0,
				reply_buf, RBD_OBJ_PREFIX_LEN_MAX);
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret < 0)
		goto out;

	p = reply_buf;
	rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p,
						p + ret, NULL, GFP_NOIO);
	ret = 0;

	if (IS_ERR(rbd_dev->header.object_prefix)) {
		ret = PTR_ERR(rbd_dev->header.object_prefix);
		rbd_dev->header.object_prefix = NULL;
	} else {
		dout("  object_prefix = %s\n", rbd_dev->header.object_prefix);
	}
out:
	kfree(reply_buf);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 164 98.20% 3 75.00%
ilya dryomov ilya dryomov 3 1.80% 1 25.00%
Total 167 100.00% 4 100.00%



static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
		u64 *snap_features)
{
	__le64 snapid = cpu_to_le64(snap_id);
	struct {
		__le64 features;
		__le64 incompat;
	} __attribute__ ((packed)) features_buf = { 0 };
	u64 unsup;
	int ret;

	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
				"rbd", "get_features",
				&snapid, sizeof (snapid),
				&features_buf, sizeof (features_buf));
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret < 0)
		return ret;
	if (ret < sizeof (features_buf))
		return -ERANGE;

	unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED;
	if (unsup) {
		rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx",
			 unsup);
		return -ENXIO;
	}

	*snap_features = le64_to_cpu(features_buf.features);

	dout("  snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n",
		(unsigned long long)snap_id,
		(unsigned long long)*snap_features,
		(unsigned long long)le64_to_cpu(features_buf.incompat));

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 173 89.64% 7 77.78%
ilya dryomov ilya dryomov 20 10.36% 2 22.22%
Total 193 100.00% 9 100.00%



static int rbd_dev_v2_features(struct rbd_device *rbd_dev)
{
	return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP,
						&rbd_dev->header.features);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%



static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
{
	struct rbd_spec *parent_spec;
	size_t size;
	void *reply_buf = NULL;
	__le64 snapid;
	void *p;
	void *end;
	u64 pool_id;
	char *image_id;
	u64 snap_id;
	u64 overlap;
	int ret;

	parent_spec = rbd_spec_alloc();
	if (!parent_spec)
		return -ENOMEM;

	size = sizeof (__le64) +				/* pool_id */
		sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX +	/* image_id */
		sizeof (__le64) +				/* snap_id */
		sizeof (__le64);				/* overlap */
	reply_buf = kmalloc(size, GFP_KERNEL);
	if (!reply_buf) {
		ret = -ENOMEM;
		goto out_err;
	}

	snapid = cpu_to_le64(rbd_dev->spec->snap_id);
	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
				"rbd", "get_parent",
				&snapid, sizeof (snapid),
				reply_buf, size);
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret < 0)
		goto out_err;

	p = reply_buf;
	end = reply_buf + ret;
	ret = -ERANGE;
	ceph_decode_64_safe(&p, end, pool_id, out_err);
	if (pool_id == CEPH_NOPOOL) {
		/*
                 * Either the parent never existed, or we have
                 * record of it but the image got flattened so it no
                 * longer has a parent.  When the parent of a
                 * layered image disappears we immediately set the
                 * overlap to 0.  The effect of this is that all new
                 * requests will be treated as if the image had no
                 * parent.
                 */
		if (rbd_dev->parent_overlap) {
			rbd_dev->parent_overlap = 0;
			rbd_dev_parent_put(rbd_dev);
			pr_info("%s: clone image has been flattened\n",
				rbd_dev->disk->disk_name);
		}

		goto out;	/* No parent?  No problem. */
	}

	/* The ceph file layout needs to fit pool id in 32 bits */

	ret = -EIO;
	if (pool_id > (u64)U32_MAX) {
		rbd_warn(NULL, "parent pool id too large (%llu > %u)",
			(unsigned long long)pool_id, U32_MAX);
		goto out_err;
	}

	image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
	if (IS_ERR(image_id)) {
		ret = PTR_ERR(image_id);
		goto out_err;
	}
	ceph_decode_64_safe(&p, end, snap_id, out_err);
	ceph_decode_64_safe(&p, end, overlap, out_err);

	/*
         * The parent won't change (except when the clone is
         * flattened, already handled that).  So we only need to
         * record the parent spec we have not already done so.
         */
	if (!rbd_dev->parent_spec) {
		parent_spec->pool_id = pool_id;
		parent_spec->image_id = image_id;
		parent_spec->snap_id = snap_id;
		rbd_dev->parent_spec = parent_spec;
		parent_spec = NULL;	/* rbd_dev now owns this */
	} else {
		kfree(image_id);
	}

	/*
         * We always update the parent overlap.  If it's zero we issue
         * a warning, as we will proceed as if there was no parent.
         */
	if (!overlap) {
		if (parent_spec) {
			/* refresh, careful to warn just once */
			if (rbd_dev->parent_overlap)
				rbd_warn(rbd_dev,
				    "clone now standalone (overlap became 0)");
		} else {
			/* initial probe */
			rbd_warn(rbd_dev, "clone is standalone (overlap 0)");
		}
	}
	rbd_dev->parent_overlap = overlap;

out:
	ret = 0;
out_err:
	kfree(reply_buf);
	rbd_spec_put(parent_spec);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 417 92.26% 11 68.75%
ilya dryomov ilya dryomov 35 7.74% 5 31.25%
Total 452 100.00% 16 100.00%



static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev)
{
	struct {
		__le64 stripe_unit;
		__le64 stripe_count;
	} __attribute__ ((packed)) striping_info_buf = { 0 };
	size_t size = sizeof (striping_info_buf);
	void *p;
	u64 obj_size;
	u64 stripe_unit;
	u64 stripe_count;
	int ret;

	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
				"rbd", "get_stripe_unit_count", NULL, 0,
				(char *)&striping_info_buf, size);
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret < 0)
		return ret;
	if (ret < size)
		return -ERANGE;

	/*
         * We don't actually support the "fancy striping" feature
         * (STRIPINGV2) yet, but if the striping sizes are the
         * defaults the behavior is the same as before.  So find
         * out, and only fail if the image has non-default values.
         */
	ret = -EINVAL;
	obj_size = (u64)1 << rbd_dev->header.obj_order;
	p = &striping_info_buf;
	stripe_unit = ceph_decode_64(&p);
	if (stripe_unit != obj_size) {
		rbd_warn(rbd_dev, "unsupported stripe unit "
				"(got %llu want %llu)",
				stripe_unit, obj_size);
		return -EINVAL;
	}
	stripe_count = ceph_decode_64(&p);
	if (stripe_count != 1) {
		rbd_warn(rbd_dev, "unsupported stripe count "
				"(got %llu want 1)", stripe_count);
		return -EINVAL;
	}
	rbd_dev->header.stripe_unit = stripe_unit;
	rbd_dev->header.stripe_count = stripe_count;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 216 98.63% 2 66.67%
ilya dryomov ilya dryomov 3 1.37% 1 33.33%
Total 219 100.00% 3 100.00%



static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
{
	size_t image_id_size;
	char *image_id;
	void *p;
	void *end;
	size_t size;
	void *reply_buf = NULL;
	size_t len = 0;
	char *image_name = NULL;
	int ret;

	rbd_assert(!rbd_dev->spec->image_name);

	len = strlen(rbd_dev->spec->image_id);
	image_id_size = sizeof (__le32) + len;
	image_id = kmalloc(image_id_size, GFP_KERNEL);
	if (!image_id)
		return NULL;

	p = image_id;
	end = image_id + image_id_size;
	ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len);

	size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX;
	reply_buf = kmalloc(size, GFP_KERNEL);
	if (!reply_buf)
		goto out;

	ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY,
				"rbd", "dir_get_name",
				image_id, image_id_size,
				reply_buf, size);
	if (ret < 0)
		goto out;
	p = reply_buf;
	end = reply_buf + ret;

	image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL);
	if (IS_ERR(image_name))
		image_name = NULL;
	else
		dout("%s: name is %s len is %zd\n", __func__, image_name, len);
out:
	kfree(reply_buf);
	kfree(image_id);

	return image_name;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 245 100.00% 6 100.00%
Total 245 100.00% 6 100.00%



static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
{
	struct ceph_snap_context *snapc = rbd_dev->header.snapc;
	const char *snap_name;
	u32 which = 0;

	/* Skip over names until we find the one we are looking for */

	snap_name = rbd_dev->header.snap_names;
	while (which < snapc->num_snaps) {
		if (!strcmp(name, snap_name))
			return snapc->snaps[which];
		snap_name += strlen(snap_name) + 1;
		which++;
	}
	return CEPH_NOSNAP;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 89 100.00% 1 100.00%
Total 89 100.00% 1 100.00%



static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
{
	struct ceph_snap_context *snapc = rbd_dev->header.snapc;
	u32 which;
	bool found = false;
	u64 snap_id;

	for (which = 0; !found && which < snapc->num_snaps; which++) {
		const char *snap_name;

		snap_id = snapc->snaps[which];
		snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id);
		if (IS_ERR(snap_name)) {
			/* ignore no-longer existing snapshots */
			if (PTR_ERR(snap_name) == -ENOENT)
				continue;
			else
				break;
		}
		found = !strcmp(name, snap_name);
		kfree(snap_name);
	}
	return found ? snap_id : CEPH_NOSNAP;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 111 88.10% 1 50.00%
josh durgin josh durgin 15 11.90% 1 50.00%
Total 126 100.00% 2 100.00%

/*
 * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if
 * no snapshot by that name is found, or if an error occurs.
 */


static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
{
	if (rbd_dev->image_format == 1)
		return rbd_v1_snap_id_by_name(rbd_dev, name);

	return rbd_v2_snap_id_by_name(rbd_dev, name);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 40 100.00% 1 100.00%
Total 40 100.00% 1 100.00%

/*
 * An image being mapped will have everything but the snap id.
 */


static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev)
{
	struct rbd_spec *spec = rbd_dev->spec;

	rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name);
	rbd_assert(spec->image_id && spec->image_name);
	rbd_assert(spec->snap_name);

	if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) {
		u64 snap_id;

		snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name);
		if (snap_id == CEPH_NOSNAP)
			return -ENOENT;

		spec->snap_id = snap_id;
	} else {
		spec->snap_id = CEPH_NOSNAP;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 78 73.58% 4 80.00%
ilya dryomov ilya dryomov 28 26.42% 1 20.00%
Total 106 100.00% 5 100.00%

/*
 * A parent image will have all ids but none of the names.
 *
 * All names in an rbd spec are dynamically allocated.  It's OK if we
 * can't figure out the name for an image id.
 */


static int rbd_spec_fill_names(struct rbd_device *rbd_dev)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct rbd_spec *spec = rbd_dev->spec;
	const char *pool_name;
	const char *image_name;
	const char *snap_name;
	int ret;

	rbd_assert(spec->pool_id != CEPH_NOPOOL);
	rbd_assert(spec->image_id);
	rbd_assert(spec->snap_id != CEPH_NOSNAP);

	/* Get the pool name; we have to make our own copy of this */

	pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id);
	if (!pool_name) {
		rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id);
		return -EIO;
	}
	pool_name = kstrdup(pool_name, GFP_KERNEL);
	if (!pool_name)
		return -ENOMEM;

	/* Fetch the image name; tolerate failure here */

	image_name = rbd_dev_image_name(rbd_dev);
	if (!image_name)
		rbd_warn(rbd_dev, "unable to get image name");

	/* Fetch the snapshot name */

	snap_name = rbd_snap_name(rbd_dev, spec->snap_id);
	if (IS_ERR(snap_name)) {
		ret = PTR_ERR(snap_name);
		goto out_err;
	}

	spec->pool_name = pool_name;
	spec->image_name = image_name;
	spec->snap_name = snap_name;

	return 0;

out_err:
	kfree(image_name);
	kfree(pool_name);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 134 61.47% 5 71.43%
ilya dryomov ilya dryomov 77 35.32% 1 14.29%
josh durgin josh durgin 7 3.21% 1 14.29%
Total 218 100.00% 7 100.00%



static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev)
{
	size_t size;
	int ret;
	void *reply_buf;
	void *p;
	void *end;
	u64 seq;
	u32 snap_count;
	struct ceph_snap_context *snapc;
	u32 i;

	/*
         * We'll need room for the seq value (maximum snapshot id),
         * snapshot count, and array of that many snapshot ids.
         * For now we have a fixed upper limit on the number we're
         * prepared to receive.
         */
	size = sizeof (__le64) + sizeof (__le32) +
			RBD_MAX_SNAP_COUNT * sizeof (__le64);
	reply_buf = kzalloc(size, GFP_KERNEL);
	if (!reply_buf)
		return -ENOMEM;

	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
				"rbd", "get_snapcontext", NULL, 0,
				reply_buf, size);
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret < 0)
		goto out;

	p = reply_buf;
	end = reply_buf + ret;
	ret = -ERANGE;
	ceph_decode_64_safe(&p, end, seq, out);
	ceph_decode_32_safe(&p, end, snap_count, out);

	/*
         * Make sure the reported number of snapshot ids wouldn't go
         * beyond the end of our buffer.  But before checking that,
         * make sure the computed size of the snapshot context we
         * allocate is representable in a size_t.
         */
	if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context))
				 / sizeof (u64)) {
		ret = -EINVAL;
		goto out;
	}
	if (!ceph_has_room(&p, end, snap_count * sizeof (__le64)))
		goto out;
	ret = 0;

	snapc = ceph_create_snap_context(snap_count, GFP_KERNEL);
	if (!snapc) {
		ret = -ENOMEM;
		goto out;
	}
	snapc->seq = seq;
	for (i = 0; i < snap_count; i++)
		snapc->snaps[i] = ceph_decode_64(&p);

	ceph_put_snap_context(rbd_dev->header.snapc);
	rbd_dev->header.snapc = snapc;

	dout("  snap context seq = %llu, snap_count = %u\n",
		(unsigned long long)seq, (unsigned int)snap_count);
out:
	kfree(reply_buf);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 316 99.06% 7 87.50%
ilya dryomov ilya dryomov 3 0.94% 1 12.50%
Total 319 100.00% 8 100.00%



static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
					u64 snap_id)
{
	size_t size;
	void *reply_buf;
	__le64 snapid;
	int ret;
	void *p;
	void *end;
	char *snap_name;

	size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN;
	reply_buf = kmalloc(size, GFP_KERNEL);
	if (!reply_buf)
		return ERR_PTR(-ENOMEM);

	snapid = cpu_to_le64(snap_id);
	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
				"rbd", "get_snapshot_name",
				&snapid, sizeof (snapid),
				reply_buf, size);
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret < 0) {
		snap_name = ERR_PTR(ret);
		goto out;
	}

	p = reply_buf;
	end = reply_buf + ret;
	snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
	if (IS_ERR(snap_name))
		goto out;

	dout("  snap_id 0x%016llx snap_name = %s\n",
		(unsigned long long)snap_id, snap_name);
out:
	kfree(reply_buf);

	return snap_name;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 174 90.62% 12 85.71%
yehuda sadeh yehuda sadeh 15 7.81% 1 7.14%
ilya dryomov ilya dryomov 3 1.56% 1 7.14%
Total 192 100.00% 14 100.00%



static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev)
{
	bool first_time = rbd_dev->header.object_prefix == NULL;
	int ret;

	ret = rbd_dev_v2_image_size(rbd_dev);
	if (ret)
		return ret;

	if (first_time) {
		ret = rbd_dev_v2_header_onetime(rbd_dev);
		if (ret)
			return ret;
	}

	ret = rbd_dev_v2_snap_context(rbd_dev);
	if (ret && first_time) {
		kfree(rbd_dev->header.object_prefix);
		rbd_dev->header.object_prefix = NULL;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 59 62.77% 6 66.67%
ilya dryomov ilya dryomov 22 23.40% 1 11.11%
josh durgin josh durgin 11 11.70% 1 11.11%
yehuda sadeh yehuda sadeh 2 2.13% 1 11.11%
Total 94 100.00% 9 100.00%



static int rbd_dev_header_info(struct rbd_device *rbd_dev)
{
	rbd_assert(rbd_image_format_valid(rbd_dev->image_format));

	if (rbd_dev->image_format == 1)
		return rbd_dev_v1_header_info(rbd_dev);

	return rbd_dev_v2_header_info(rbd_dev);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%

/*
 * Skips over white space at *buf, and updates *buf to point to the
 * first found non-space character (if any). Returns the length of
 * the token (string of non-white space characters) found.  Note
 * that *buf must be terminated with '\0'.
 */


static inline size_t next_token(const char **buf)
{
        /*
        * These are the characters that produce nonzero for
        * isspace() in the "C" and "POSIX" locales.
        */
        const char *spaces = " \f\n\r\t\v";

        *buf += strspn(*buf, spaces);	/* Find start of token */

	return strcspn(*buf, spaces);   /* Return token length */
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 43 100.00% 1 100.00%
Total 43 100.00% 1 100.00%

/*
 * Finds the next token in *buf, dynamically allocates a buffer big
 * enough to hold a copy of it, and copies the token into the new
 * buffer.  The copy is guaranteed to be terminated with '\0'.  Note
 * that a duplicate buffer is created even for a zero-length token.
 *
 * Returns a pointer to the newly-allocated duplicate, or a null
 * pointer if memory for the duplicate was not available.  If
 * the lenp argument is a non-null pointer, the length of the token
 * (not including the '\0') is returned in *lenp.
 *
 * If successful, the *buf pointer will be updated to point beyond
 * the end of the found token.
 *
 * Note: uses GFP_KERNEL for allocation.
 */


static inline char *dup_token(const char **buf, size_t *lenp)
{
	char *dup;
	size_t len;

	len = next_token(buf);
	dup = kmemdup(*buf, len + 1, GFP_KERNEL);
	if (!dup)
		return NULL;
	*(dup + len) = '\0';
	*buf += len;

	if (lenp)
		*lenp = len;

	return dup;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 80 100.00% 2 100.00%
Total 80 100.00% 2 100.00%

/*
 * Parse the options provided for an "rbd add" (i.e., rbd image
 * mapping) request.  These arrive via a write to /sys/bus/rbd/add,
 * and the data written is passed here via a NUL-terminated buffer.
 * Returns 0 if successful or an error code otherwise.
 *
 * The information extracted from these options is recorded in
 * the other parameters which return dynamically-allocated
 * structures:
 *  ceph_opts
 *      The address of a pointer that will refer to a ceph options
 *      structure.  Caller must release the returned pointer using
 *      ceph_destroy_options() when it is no longer needed.
 *  rbd_opts
 *      Address of an rbd options pointer.  Fully initialized by
 *      this function; caller must release with kfree().
 *  spec
 *      Address of an rbd image specification pointer.  Fully
 *      initialized by this function based on parsed options.
 *      Caller must release with rbd_spec_put().
 *
 * The options passed take this form:
 *  <mon_addrs> <options> <pool_name> <image_name> [<snap_id>]
 * where:
 *  <mon_addrs>
 *      A comma-separated list of one or more monitor addresses.
 *      A monitor address is an ip address, optionally followed
 *      by a port number (separated by a colon).
 *        I.e.:  ip1[:port1][,ip2[:port2]...]
 *  <options>
 *      A comma-separated list of ceph and/or rbd options.
 *  <pool_name>
 *      The name of the rados pool containing the rbd image.
 *  <image_name>
 *      The name of the image in that pool to map.
 *  <snap_id>
 *      An optional snapshot id.  If provided, the mapping will
 *      present data from the image at the time that snapshot was
 *      created.  The image head is used if no snapshot id is
 *      provided.  Snapshot mappings are always read-only.
 */


static int rbd_add_parse_args(const char *buf,
				struct ceph_options **ceph_opts,
				struct rbd_options **opts,
				struct rbd_spec **rbd_spec)
{
	size_t len;
	char *options;
	const char *mon_addrs;
	char *snap_name;
	size_t mon_addrs_size;
	struct rbd_spec *spec = NULL;
	struct rbd_options *rbd_opts = NULL;
	struct ceph_options *copts;
	int ret;

	/* The first four tokens are required */

	len = next_token(&buf);
	if (!len) {
		rbd_warn(NULL, "no monitor address(es) provided");
		return -EINVAL;
	}
	mon_addrs = buf;
	mon_addrs_size = len + 1;
	buf += len;

	ret = -EINVAL;
	options = dup_token(&buf, NULL);
	if (!options)
		return -ENOMEM;
	if (!*options) {
		rbd_warn(NULL, "no options provided");
		goto out_err;
	}

	spec = rbd_spec_alloc();
	if (!spec)
		goto out_mem;

	spec->pool_name = dup_token(&buf, NULL);
	if (!spec->pool_name)
		goto out_mem;
	if (!*spec->pool_name) {
		rbd_warn(NULL, "no pool name provided");
		goto out_err;
	}

	spec->image_name = dup_token(&buf, NULL);
	if (!spec->image_name)
		goto out_mem;
	if (!*spec->image_name) {
		rbd_warn(NULL, "no image name provided");
		goto out_err;
	}

	/*
         * Snapshot name is optional; default is to use "-"
         * (indicating the head/no snapshot).
         */
	len = next_token(&buf);
	if (!len) {
		buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */
		len = sizeof (RBD_SNAP_HEAD_NAME) - 1;
	} else if (len > RBD_MAX_SNAP_NAME_LEN) {
		ret = -ENAMETOOLONG;
		goto out_err;
	}
	snap_name = kmemdup(buf, len + 1, GFP_KERNEL);
	if (!snap_name)
		goto out_mem;
	*(snap_name + len) = '\0';
	spec->snap_name = snap_name;

	/* Initialize all rbd options to the defaults */

	rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL);
	if (!rbd_opts)
		goto out_mem;

	rbd_opts->read_only = RBD_READ_ONLY_DEFAULT;
	rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT;
	rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT;

	copts = ceph_parse_options(options, mon_addrs,
					mon_addrs + mon_addrs_size - 1,
					parse_rbd_opts_token, rbd_opts);
	if (IS_ERR(copts)) {
		ret = PTR_ERR(copts);
		goto out_err;
	}
	kfree(options);

	*ceph_opts = copts;
	*opts = rbd_opts;
	*rbd_spec = spec;

	return 0;
out_mem:
	ret = -ENOMEM;
out_err:
	kfree(rbd_opts);
	rbd_spec_put(spec);
	kfree(options);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 449 97.40% 19 90.48%
ilya dryomov ilya dryomov 12 2.60% 2 9.52%
Total 461 100.00% 21 100.00%

/*
 * Return pool id (>= 0) or a negative error code.
 */


static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name)
{
	struct ceph_options *opts = rbdc->client->options;
	u64 newest_epoch;
	int tries = 0;
	int ret;

again:
	ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name);
	if (ret == -ENOENT && tries++ < 1) {
		ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap",
					    &newest_epoch);
		if (ret < 0)
			return ret;

		if (rbdc->client->osdc.osdmap->epoch < newest_epoch) {
			ceph_osdc_maybe_request_map(&rbdc->client->osdc);
			(void) ceph_monc_wait_osdmap(&rbdc->client->monc,
						     newest_epoch,
						     opts->mount_timeout);
			goto again;
		} else {
			/* the osdmap we have is new enough */
			return -ENOENT;
		}
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 154 100.00% 4 100.00%
Total 154 100.00% 4 100.00%

/*
 * An rbd format 2 image has a unique identifier, distinct from the
 * name given to it by the user.  Internally, that identifier is
 * what's used to specify the names of objects related to the image.
 *
 * A special "rbd id" object is used to map an rbd image name to its
 * id.  If that object doesn't exist, then there is no v2 rbd image
 * with the supplied name.
 *
 * This function will record the given rbd_dev's image_id field if
 * it can be determined, and in that case will return 0.  If any
 * errors occur a negative errno will be returned and the rbd_dev's
 * image_id field will be unchanged (and should be NULL).
 */


static int rbd_dev_image_id(struct rbd_device *rbd_dev)
{
	int ret;
	size_t size;
	char *object_name;
	void *response;
	char *image_id;

	/*
         * When probing a parent image, the image id is already
         * known (and the image name likely is not).  There's no
         * need to fetch the image id again in this case.  We
         * do still need to set the image format though.
         */
	if (rbd_dev->spec->image_id) {
		rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1;

		return 0;
	}

	/*
         * First, see if the format 2 image id file exists, and if
         * so, get the image's persistent id from it.
         */
	size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name);
	object_name = kmalloc(size, GFP_NOIO);
	if (!object_name)
		return -ENOMEM;
	sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name);
	dout("rbd id object name is %s\n", object_name);

	/* Response will be an encoded string, which includes a length */

	size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX;
	response = kzalloc(size, GFP_NOIO);
	if (!response) {
		ret = -ENOMEM;
		goto out;
	}

	/* If it doesn't exist we'll assume it's a format 1 image */

	ret = rbd_obj_method_sync(rbd_dev, object_name,
				"rbd", "get_id", NULL, 0,
				response, RBD_IMAGE_ID_LEN_MAX);
	dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
	if (ret == -ENOENT) {
		image_id = kstrdup("", GFP_KERNEL);
		ret = image_id ? 0 : -ENOMEM;
		if (!ret)
			rbd_dev->image_format = 1;
	} else if (ret >= 0) {
		void *p = response;

		image_id = ceph_extract_encoded_string(&p, p + ret,
						NULL, GFP_NOIO);
		ret = PTR_ERR_OR_ZERO(image_id);
		if (!ret)
			rbd_dev->image_format = 2;
	}

	if (!ret) {
		rbd_dev->spec->image_id = image_id;
		dout("image_id is %s\n", image_id);
	}
out:
	kfree(response);
	kfree(object_name);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 301 99.01% 9 81.82%
ilya dryomov ilya dryomov 2 0.66% 1 9.09%
duan jiong duan jiong 1 0.33% 1 9.09%
Total 304 100.00% 11 100.00%

/*
 * Undo whatever state changes are made by v1 or v2 header info
 * call.
 */


static void rbd_dev_unprobe(struct rbd_device *rbd_dev)
{
	struct rbd_image_header	*header;

	rbd_dev_parent_put(rbd_dev);

	/* Free dynamic fields from the header, then zero it out */

	header = &rbd_dev->header;
	ceph_put_snap_context(header->snapc);
	kfree(header->snap_sizes);
	kfree(header->snap_names);
	kfree(header->object_prefix);
	memset(header, 0, sizeof (*header));
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 70 100.00% 3 100.00%
Total 70 100.00% 3 100.00%



static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev)
{
	int ret;

	ret = rbd_dev_v2_object_prefix(rbd_dev);
	if (ret)
		goto out_err;

	/*
         * Get the and check features for the image.  Currently the
         * features are assumed to never change.
         */
	ret = rbd_dev_v2_features(rbd_dev);
	if (ret)
		goto out_err;

	/* If the image supports fancy striping, get its parameters */

	if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) {
		ret = rbd_dev_v2_striping_info(rbd_dev);
		if (ret < 0)
			goto out_err;
	}
	/* No support for crypto and compression type format 2 images */

	return 0;
out_err:
	rbd_dev->header.features = 0;
	kfree(rbd_dev->header.object_prefix);
	rbd_dev->header.object_prefix = NULL;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 106 100.00% 11 100.00%
Total 106 100.00% 11 100.00%

/*
 * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() ->
 * rbd_dev_image_probe() recursion depth, which means it's also the
 * length of the already discovered part of the parent chain.
 */


static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth)
{
	struct rbd_device *parent = NULL;
	int ret;

	if (!rbd_dev->parent_spec)
		return 0;

	if (++depth > RBD_MAX_PARENT_CHAIN_LEN) {
		pr_info("parent chain is too long (%d)\n", depth);
		ret = -EINVAL;
		goto out_err;
	}

	parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec);
	if (!parent) {
		ret = -ENOMEM;
		goto out_err;
	}

	/*
         * Images related by parent/child relationships always share
         * rbd_client and spec/parent_spec, so bump their refcounts.
         */
	__rbd_get_client(rbd_dev->rbd_client);
	rbd_spec_get(rbd_dev->parent_spec);

	ret = rbd_dev_image_probe(parent, depth);
	if (ret < 0)
		goto out_err;

	rbd_dev->parent = parent;
	atomic_set(&rbd_dev->parent_ref, 1);
	return 0;

out_err:
	rbd_dev_unparent(rbd_dev);
	rbd_dev_destroy(parent);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 99 64.71% 6 66.67%
ilya dryomov ilya dryomov 54 35.29% 3 33.33%
Total 153 100.00% 9 100.00%

/*
 * rbd_dev->header_rwsem must be locked for write and will be unlocked
 * upon return.
 */


static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
{
	int ret;

	/* Record our major and minor device numbers. */

	if (!single_major) {
		ret = register_blkdev(0, rbd_dev->name);
		if (ret < 0)
			goto err_out_unlock;

		rbd_dev->major = ret;
		rbd_dev->minor = 0;
	} else {
		rbd_dev->major = rbd_major;
		rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id);
	}

	/* Set up the blkdev mapping. */

	ret = rbd_init_disk(rbd_dev);
	if (ret)
		goto err_out_blkdev;

	ret = rbd_dev_mapping_set(rbd_dev);
	if (ret)
		goto err_out_disk;

	set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
	set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only);

	dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id);
	ret = device_add(&rbd_dev->dev);
	if (ret)
		goto err_out_mapping;

	/* Everything's ready.  Announce the disk to the world. */

	set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
	up_write(&rbd_dev->header_rwsem);

	spin_lock(&rbd_dev_list_lock);
	list_add_tail(&rbd_dev->node, &rbd_dev_list);
	spin_unlock(&rbd_dev_list_lock);

	add_disk(rbd_dev->disk);
	pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name,
		(unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT,
		rbd_dev->header.features);

	return ret;

err_out_mapping:
	rbd_dev_mapping_clear(rbd_dev);
err_out_disk:
	rbd_free_disk(rbd_dev);
err_out_blkdev:
	if (!single_major)
		unregister_blkdev(rbd_dev->major, rbd_dev->name);
err_out_unlock:
	up_write(&rbd_dev->header_rwsem);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 165 56.90% 6 42.86%
ilya dryomov ilya dryomov 112 38.62% 7 50.00%
josh durgin josh durgin 13 4.48% 1 7.14%
Total 290 100.00% 14 100.00%



static int rbd_dev_header_name(struct rbd_device *rbd_dev)
{
	struct rbd_spec *spec = rbd_dev->spec;
	int ret;

	/* Record the header object name for this rbd image. */

	rbd_assert(rbd_image_format_valid(rbd_dev->image_format));

	rbd_dev->header_oloc.pool = rbd_dev->layout.pool_id;
	if (rbd_dev->image_format == 1)
		ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s",
				       spec->image_name, RBD_SUFFIX);
	else
		ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s",
				       RBD_HEADER_PREFIX, spec->image_id);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 72 73.47% 1 25.00%
ilya dryomov ilya dryomov 24 24.49% 2 50.00%
zhen yan zhen yan 2 2.04% 1 25.00%
Total 98 100.00% 4 100.00%



static void rbd_dev_image_release(struct rbd_device *rbd_dev)
{
	rbd_dev_unprobe(rbd_dev);
	rbd_dev->image_format = 0;
	kfree(rbd_dev->spec->image_id);
	rbd_dev->spec->image_id = NULL;

	rbd_dev_destroy(rbd_dev);
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 44 100.00% 2 100.00%
Total 44 100.00% 2 100.00%

/*
 * Probe for the existence of the header object for the given rbd
 * device.  If this image is the one being mapped (i.e., not a
 * parent), initiate a watch on its header object before using that
 * object to get detailed information about the rbd image.
 */


static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
{
	int ret;

	/*
         * Get the id from the image id object.  Unless there's an
         * error, rbd_dev->spec->image_id will be filled in with
         * a dynamically-allocated string, and rbd_dev->image_format
         * will be set to either 1 or 2.
         */
	ret = rbd_dev_image_id(rbd_dev);
	if (ret)
		return ret;

	ret = rbd_dev_header_name(rbd_dev);
	if (ret)
		goto err_out_format;

	if (!depth) {
		ret = rbd_register_watch(rbd_dev);
		if (ret) {
			if (ret == -ENOENT)
				pr_info("image %s/%s does not exist\n",
					rbd_dev->spec->pool_name,
					rbd_dev->spec->image_name);
			goto err_out_format;
		}
	}

	ret = rbd_dev_header_info(rbd_dev);
	if (ret)
		goto err_out_watch;

	/*
         * If this image is the one being mapped, we have pool name and
         * id, image name and id, and snap name - need to fill snap id.
         * Otherwise this is a parent image, identified by pool, image
         * and snap ids - need to fill in names for those ids.
         */
	if (!depth)
		ret = rbd_spec_fill_snap_id(rbd_dev);
	else
		ret = rbd_spec_fill_names(rbd_dev);
	if (ret) {
		if (ret == -ENOENT)
			pr_info("snap %s/%s@%s does not exist\n",
				rbd_dev->spec->pool_name,
				rbd_dev->spec->image_name,
				rbd_dev->spec->snap_name);
		goto err_out_probe;
	}

	if (rbd_dev->header.features & RBD_FEATURE_LAYERING) {
		ret = rbd_dev_v2_parent_info(rbd_dev);
		if (ret)
			goto err_out_probe;

		/*
                 * Need to warn users if this image is the one being
                 * mapped and has a parent.
                 */
		if (!depth && rbd_dev->parent_spec)
			rbd_warn(rbd_dev,
				 "WARNING: kernel layering is EXPERIMENTAL!");
	}

	ret = rbd_dev_probe_parent(rbd_dev, depth);
	if (ret)
		goto err_out_probe;

	dout("discovered format %u image, header name is %s\n",
		rbd_dev->image_format, rbd_dev->header_oid.name);
	return 0;

err_out_probe:
	rbd_dev_unprobe(rbd_dev);
err_out_watch:
	if (!depth)
		rbd_unregister_watch(rbd_dev);
err_out_format:
	rbd_dev->image_format = 0;
	kfree(rbd_dev->spec->image_id);
	rbd_dev->spec->image_id = NULL;
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 160 54.98% 13 65.00%
ilya dryomov ilya dryomov 131 45.02% 7 35.00%
Total 291 100.00% 20 100.00%



static ssize_t do_rbd_add(struct bus_type *bus,
			  const char *buf,
			  size_t count)
{
	struct rbd_device *rbd_dev = NULL;
	struct ceph_options *ceph_opts = NULL;
	struct rbd_options *rbd_opts = NULL;
	struct rbd_spec *spec = NULL;
	struct rbd_client *rbdc;
	bool read_only;
	int rc;

	if (!try_module_get(THIS_MODULE))
		return -ENODEV;

	/* parse add command */
	rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec);
	if (rc < 0)
		goto out;

	rbdc = rbd_get_client(ceph_opts);
	if (IS_ERR(rbdc)) {
		rc = PTR_ERR(rbdc);
		goto err_out_args;
	}

	/* pick the pool */
	rc = rbd_add_get_pool_id(rbdc, spec->pool_name);
	if (rc < 0) {
		if (rc == -ENOENT)
			pr_info("pool %s does not exist\n", spec->pool_name);
		goto err_out_client;
	}
	spec->pool_id = (u64)rc;

	rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts);
	if (!rbd_dev) {
		rc = -ENOMEM;
		goto err_out_client;
	}
	rbdc = NULL;		/* rbd_dev now owns this */
	spec = NULL;		/* rbd_dev now owns this */
	rbd_opts = NULL;	/* rbd_dev now owns this */

	rbd_dev->config_info = kstrdup(buf, GFP_KERNEL);
	if (!rbd_dev->config_info) {
		rc = -ENOMEM;
		goto err_out_rbd_dev;
	}

	down_write(&rbd_dev->header_rwsem);
	rc = rbd_dev_image_probe(rbd_dev, 0);
	if (rc < 0) {
		up_write(&rbd_dev->header_rwsem);
		goto err_out_rbd_dev;
	}

	/* If we are mapping a snapshot it must be marked read-only */

	read_only = rbd_dev->opts->read_only;
	if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
		read_only = true;
	rbd_dev->mapping.read_only = read_only;

	rc = rbd_dev_device_setup(rbd_dev);
	if (rc) {
		/*
                 * rbd_unregister_watch() can't be moved into
                 * rbd_dev_image_release() without refactoring, see
                 * commit 1f3ef78861ac.
                 */
		rbd_unregister_watch(rbd_dev);
		rbd_dev_image_release(rbd_dev);
		goto out;
	}

	rc = count;
out:
	module_put(THIS_MODULE);
	return rc;

err_out_rbd_dev:
	rbd_dev_destroy(rbd_dev);
err_out_client:
	rbd_put_client(rbdc);
err_out_args:
	rbd_spec_put(spec);
	kfree(rbd_opts);
	goto out;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 190 50.53% 26 66.67%
ilya dryomov ilya dryomov 80 21.28% 10 25.64%
yehuda sadeh yehuda sadeh 68 18.09% 2 5.13%
michael christie michael christie 38 10.11% 1 2.56%
Total 376 100.00% 39 100.00%



static ssize_t rbd_add(struct bus_type *bus,
		       const char *buf,
		       size_t count)
{
	if (single_major)
		return -EINVAL;

	return do_rbd_add(bus, buf, count);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static ssize_t rbd_add_single_major(struct bus_type *bus,
				    const char *buf,
				    size_t count)
{
	return do_rbd_add(bus, buf, count);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%



static void rbd_dev_device_release(struct rbd_device *rbd_dev)
{
	rbd_free_disk(rbd_dev);

	spin_lock(&rbd_dev_list_lock);
	list_del_init(&rbd_dev->node);
	spin_unlock(&rbd_dev_list_lock);

	clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
	device_del(&rbd_dev->dev);
	rbd_dev_mapping_clear(rbd_dev);
	if (!single_major)
		unregister_blkdev(rbd_dev->major, rbd_dev->name);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 35 46.67% 3 27.27%
alex elder alex elder 25 33.33% 6 54.55%
yehuda sadeh yehuda sadeh 15 20.00% 2 18.18%
Total 75 100.00% 11 100.00%



static void rbd_dev_remove_parent(struct rbd_device *rbd_dev)
{
	while (rbd_dev->parent) {
		struct rbd_device *first = rbd_dev;
		struct rbd_device *second = first->parent;
		struct rbd_device *third;

		/*
                 * Follow to the parent with no grandparent and
                 * remove it.
                 */
		while (second && (third = second->parent)) {
			first = second;
			second = third;
		}
		rbd_assert(second);
		rbd_dev_image_release(second);
		first->parent = NULL;
		first->parent_overlap = 0;

		rbd_assert(first->parent_spec);
		rbd_spec_put(first->parent_spec);
		first->parent_spec = NULL;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 105 100.00% 4 100.00%
Total 105 100.00% 4 100.00%



static ssize_t do_rbd_remove(struct bus_type *bus,
			     const char *buf,
			     size_t count)
{
	struct rbd_device *rbd_dev = NULL;
	struct list_head *tmp;
	int dev_id;
	char opt_buf[6];
	bool already = false;
	bool force = false;
	int ret;

	dev_id = -1;
	opt_buf[0] = '\0';
	sscanf(buf, "%d %5s", &dev_id, opt_buf);
	if (dev_id < 0) {
		pr_err("dev_id out of range\n");
		return -EINVAL;
	}
	if (opt_buf[0] != '\0') {
		if (!strcmp(opt_buf, "force")) {
			force = true;
		} else {
			pr_err("bad remove option at '%s'\n", opt_buf);
			return -EINVAL;
		}
	}

	ret = -ENOENT;
	spin_lock(&rbd_dev_list_lock);
	list_for_each(tmp, &rbd_dev_list) {
		rbd_dev = list_entry(tmp, struct rbd_device, node);
		if (rbd_dev->dev_id == dev_id) {
			ret = 0;
			break;
		}
	}
	if (!ret) {
		spin_lock_irq(&rbd_dev->lock);
		if (rbd_dev->open_count && !force)
			ret = -EBUSY;
		else
			already = test_and_set_bit(RBD_DEV_FLAG_REMOVING,
							&rbd_dev->flags);
		spin_unlock_irq(&rbd_dev->lock);
	}
	spin_unlock(&rbd_dev_list_lock);
	if (ret < 0 || already)
		return ret;

	if (force) {
		/*
                 * Prevent new IO from being queued and wait for existing
                 * IO to complete/fail.
                 */
		blk_mq_freeze_queue(rbd_dev->disk->queue);
		blk_set_queue_dying(rbd_dev->disk->queue);
	}

	down_write(&rbd_dev->lock_rwsem);
	if (__rbd_is_lock_owner(rbd_dev))
		rbd_unlock(rbd_dev);
	up_write(&rbd_dev->lock_rwsem);
	rbd_unregister_watch(rbd_dev);

	/*
         * Don't free anything from rbd_dev->disk until after all
         * notifies are completely processed. Otherwise
         * rbd_bus_del_dev() will race with rbd_watch_cb(), resulting
         * in a potential use after free of rbd_dev->disk or rbd_dev.
         */
	rbd_dev_device_release(rbd_dev);
	rbd_dev_image_release(rbd_dev);

	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 115 35.94% 8 50.00%
michael christie michael christie 98 30.62% 1 6.25%
yehuda sadeh yehuda sadeh 71 22.19% 2 12.50%
ilya dryomov ilya dryomov 31 9.69% 4 25.00%
josh durgin josh durgin 5 1.56% 1 6.25%
Total 320 100.00% 16 100.00%



static ssize_t rbd_remove(struct bus_type *bus,
			  const char *buf,
			  size_t count)
{
	if (single_major)
		return -EINVAL;

	return do_rbd_remove(bus, buf, count);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static ssize_t rbd_remove_single_major(struct bus_type *bus,
				       const char *buf,
				       size_t count)
{
	return do_rbd_remove(bus, buf, count);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%

/*
 * create control files in sysfs
 * /sys/bus/rbd/...
 */


static int rbd_sysfs_init(void)
{
	int ret;

	ret = device_register(&rbd_root_dev);
	if (ret < 0)
		return ret;

	ret = bus_register(&rbd_bus_type);
	if (ret < 0)
		device_unregister(&rbd_root_dev);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 36 70.59% 2 66.67%
alex elder alex elder 15 29.41% 1 33.33%
Total 51 100.00% 3 100.00%



static void rbd_sysfs_cleanup(void)
{
	bus_unregister(&rbd_bus_type);
	device_unregister(&rbd_root_dev);
}

Contributors
Person Tokens Prop Commits CommitProp
yehuda sadeh yehuda sadeh 16 80.00% 2 66.67%
alex elder alex elder 4 20.00% 1 33.33%
Total 20 100.00% 3 100.00%



static int rbd_slab_init(void)
{
	rbd_assert(!rbd_img_request_cache);
	rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0);
	if (!rbd_img_request_cache)
		return -ENOMEM;

	rbd_assert(!rbd_obj_request_cache);
	rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0);
	if (!rbd_obj_request_cache)
		goto out_err;

	rbd_assert(!rbd_segment_name_cache);
	rbd_segment_name_cache = kmem_cache_create("rbd_segment_name",
					CEPH_MAX_OID_NAME_LEN + 1, 1, 0, NULL);
	if (rbd_segment_name_cache)
		return 0;
out_err:
	kmem_cache_destroy(rbd_obj_request_cache);
	rbd_obj_request_cache = NULL;

	kmem_cache_destroy(rbd_img_request_cache);
	rbd_img_request_cache = NULL;

	return -ENOMEM;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 106 97.25% 3 60.00%
geliang tang geliang tang 2 1.83% 1 20.00%
ilya dryomov ilya dryomov 1 0.92% 1 20.00%
Total 109 100.00% 5 100.00%



static void rbd_slab_exit(void)
{
	rbd_assert(rbd_segment_name_cache);
	kmem_cache_destroy(rbd_segment_name_cache);
	rbd_segment_name_cache = NULL;

	rbd_assert(rbd_obj_request_cache);
	kmem_cache_destroy(rbd_obj_request_cache);
	rbd_obj_request_cache = NULL;

	rbd_assert(rbd_img_request_cache);
	kmem_cache_destroy(rbd_img_request_cache);
	rbd_img_request_cache = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 50 100.00% 3 100.00%
Total 50 100.00% 3 100.00%



static int __init rbd_init(void)
{
	int rc;

	if (!libceph_compatible(NULL)) {
		rbd_warn(NULL, "libceph incompatibility (quitting)");
		return -EINVAL;
	}

	rc = rbd_slab_init();
	if (rc)
		return rc;

	/*
         * The number of active work items is limited by the number of
         * rbd devices * queue depth, so leave @max_active at default.
         */
	rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0);
	if (!rbd_wq) {
		rc = -ENOMEM;
		goto err_out_slab;
	}

	if (single_major) {
		rbd_major = register_blkdev(0, RBD_DRV_NAME);
		if (rbd_major < 0) {
			rc = rbd_major;
			goto err_out_wq;
		}
	}

	rc = rbd_sysfs_init();
	if (rc)
		goto err_out_blkdev;

	if (single_major)
		pr_info("loaded (major %d)\n", rbd_major);
	else
		pr_info("loaded\n");

	return 0;

err_out_blkdev:
	if (single_major)
		unregister_blkdev(rbd_major, RBD_DRV_NAME);
err_out_wq:
	destroy_workqueue(rbd_wq);
err_out_slab:
	rbd_slab_exit();
	return rc;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 101 62.35% 5 55.56%
alex elder alex elder 33 20.37% 3 33.33%
yehuda sadeh yehuda sadeh 28 17.28% 1 11.11%
Total 162 100.00% 9 100.00%



static void __exit rbd_exit(void)
{
	ida_destroy(&rbd_dev_id_ida);
	rbd_sysfs_cleanup();
	if (single_major)
		unregister_blkdev(rbd_major, RBD_DRV_NAME);
	destroy_workqueue(rbd_wq);
	rbd_slab_exit();
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 22 59.46% 3 50.00%
yehuda sadeh yehuda sadeh 11 29.73% 1 16.67%
alex elder alex elder 4 10.81% 2 33.33%
Total 37 100.00% 6 100.00%


module_init(rbd_init);

module_exit(rbd_exit);

MODULE_AUTHOR("Alex Elder <elder@inktank.com>");
MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
/* following authorship retained from original osdblk.c */
MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>");

MODULE_DESCRIPTION("RADOS Block Device (RBD) driver");
MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
alex elder alex elder 14544 54.24% 262 62.23%
ilya dryomov ilya dryomov 7519 28.04% 95 22.57%
yehuda sadeh yehuda sadeh 2350 8.76% 4 0.95%
josh durgin josh durgin 1014 3.78% 25 5.94%
guangliang zhao guangliang zhao 644 2.40% 4 0.95%
christoph hellwig christoph hellwig 294 1.10% 1 0.24%
michael christie michael christie 262 0.98% 5 1.19%
sage weil sage weil 33 0.12% 4 0.95%
greg kroah-hartman greg kroah-hartman 30 0.11% 1 0.24%
zhen yan zhen yan 27 0.10% 4 0.95%
himangi saraogi himangi saraogi 24 0.09% 1 0.24%
ronny hegewald ronny hegewald 22 0.08% 1 0.24%
kent overstreet kent overstreet 20 0.07% 3 0.71%
vasiliy kulikov vasiliy kulikov 7 0.03% 1 0.24%
sf markus elfring sf markus elfring 4 0.01% 1 0.24%
jens axboe jens axboe 4 0.01% 1 0.24%
geert uytterhoeven geert uytterhoeven 3 0.01% 1 0.24%
david disseldorp david disseldorp 3 0.01% 1 0.24%
jan kara jan kara 2 0.01% 1 0.24%
geliang tang geliang tang 2 0.01% 1 0.24%
xi wang xi wang 1 0.00% 1 0.24%
al viro al viro 1 0.00% 1 0.24%
duan jiong duan jiong 1 0.00% 1 0.24%
dan carpenter dan carpenter 1 0.00% 1 0.24%
Total 26812 100.00% 421 100.00%
Directory: drivers/block

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
alex elder	alex elder	54	100.00%	1	100.00%
	Total	54	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 drivers/block/rbd.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors
