Release 4.11 drivers/block/rbd.c

/*
   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;
}

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/* 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;
}

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#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		(1ULL<<0)

#define RBD_FEATURE_STRIPINGV2		(1ULL<<1)

#define RBD_FEATURE_EXCLUSIVE_LOCK	(1ULL<<2)

#define RBD_FEATURE_DATA_POOL		(1ULL<<7)


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

/* 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;
	
u64 stripe_unit;
	
u64 stripe_count;
	
s64 data_pool_id;
	
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 {
	
u64			object_no;
	
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 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;
}

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

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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;
}

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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;
}

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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;
}

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static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf)
{
	return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED);
}

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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 BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL);


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,
	&bus_attr_supported_features.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;
}

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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)
{
}

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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;
}

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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);
}

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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
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Guangliang Zhao
101
61.59%
1
50.00%
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;
}

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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
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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
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CommitProp
Yehuda Sadeh Weinraub
157
80.51%
1
14.29%
Alex Elder
27
13.85%
4
57.14%
Vasiliy Kulikov
7
3.59%
1
14.29%
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
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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 Weinraub
48
55.17%
1
25.00%
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
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Commits
CommitProp
Yehuda Sadeh Weinraub
139
68.47%
1
16.67%
Ilya Dryomov
43
21.18%
3
50.00%
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
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CommitProp
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
34
56.67%
8
80.00%
Yehuda Sadeh Weinraub
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 Weinraub
52
77.61%
1
33.33%
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
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Commits
CommitProp
Yehuda Sadeh Weinraub
18
72.00%
1
33.33%
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
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CommitProp
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;
}

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Alex Elder
137
100.00%
3
100.00%
Total
137
100.00%
3
100.00%

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


static u32 rbd_obj_bytes(struct rbd_image_header *header)
{
	return 1U << header->obj_order;
}

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Ilya Dryomov
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%



static void rbd_init_layout(struct rbd_device *rbd_dev)
{
	if (rbd_dev->header.stripe_unit == 0 ||
	    rbd_dev->header.stripe_count == 0) {
		rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header);
		rbd_dev->header.stripe_count = 1;
	}

	rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit;
	rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count;
	rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header);
	rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ?
			  rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id;
	RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL);
}

Contributors
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Ilya Dryomov
128
100.00%
2
100.00%
Total
128
100.00%
2
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) {
		object_prefix = kstrndup(ondisk->object_prefix,
					 sizeof(ondisk->object_prefix),
					 GFP_KERNEL);
		if (!object_prefix)
			return -ENOMEM;
	}

	/* 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;
		rbd_init_layout(rbd_dev);
	} 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
294
72.59%
16
80.00%
Yehuda Sadeh Weinraub
101
24.94%
1
5.00%
Ilya Dryomov
6
1.48%
2
10.00%
SF Markus Elfring
4
0.99%
1
5.00%
Total
405
100.00%
20
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
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
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CommitProp
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
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Commits
CommitProp
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
43
65.15%
2
66.67%
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
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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
97
74.62%
6
66.67%
Yehuda Sadeh Weinraub
28
21.54%
1
11.11%
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
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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
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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
27
100.00%
3
100.00%
Total
27
100.00%
3
100.00%



static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset)
{
	u64 segment_size = rbd_obj_bytes(&rbd_dev->header);

	return offset & (segment_size - 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
23
67.65%
1
25.00%
Himangi Saraogi
6
17.65%
1
25.00%
Yehuda Sadeh Weinraub
3
8.82%
1
25.00%
Ilya Dryomov
2
5.88%
1
25.00%
Total
34
100.00%
4
100.00%



static u64 rbd_segment_length(struct rbd_device *rbd_dev,
				u64 offset, u64 length)
{
	u64 segment_size = rbd_obj_bytes(&rbd_dev->header);

	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
43
71.67%
2
50.00%
Yehuda Sadeh Weinraub
13
21.67%
1
25.00%
Ilya Dryomov
4
6.67%
1
25.00%
Total
60
100.00%
4
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 Weinraub
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 Weinraub
111
86.72%
1
25.00%
Kent Overstreet
10
7.81%
1
25.00%
Alex Elder
6
4.69%
1
25.00%
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
139
97.89%
2
66.67%
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
49
75.38%
1
25.00%
Yehuda Sadeh Weinraub
11
16.92%
1
25.00%
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
122
57.28%
3
60.00%
Yehuda Sadeh Weinraub
86
40.38%
1
20.00%
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
46
97.87%
2
66.67%
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
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
55
98.21%
2
66.67%
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
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
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
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
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
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,
		kref_read(&obj_request->kref));
	kref_get(&obj_request->kref);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
35
97.22%
3
75.00%
Peter Zijlstra
1
2.78%
1
25.00%
Total
36
100.00%
4
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,
		kref_read(&obj_request->kref));
	kref_put(&obj_request->kref, rbd_obj_request_destroy);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
44
97.78%
3
75.00%
Peter Zijlstra
1
2.22%
1
25.00%
Total
45
100.00%
4
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
35
97.22%
1
50.00%
Peter Zijlstra
1
2.78%
1
50.00%
Total
36
100.00%
2
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,
		kref_read(&img_request->kref));
	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
62
98.41%
3
75.00%
Peter Zijlstra
1
1.59%
1
25.00%
Total
63
100.00%
4
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
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
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
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 object_no %016llx %llu~%llu osd_req %p\n", __func__,
	     obj_request, obj_request->object_no, obj_request->offset,
	     obj_request->length, 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
51
64.56%
4
40.00%
Alex Elder
22
27.85%
4
40.00%
Yehuda Sadeh Weinraub
6
7.59%
2
20.00%
Total
79
100.00%
10
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
54
70.13%
3
75.00%
Ilya Dryomov
23
29.87%
1
25.00%
Total
77
100.00%
4
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
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
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
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
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
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
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
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
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Commits
CommitProp
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
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
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
36
97.30%
1
50.00%
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
153
98.08%
2
50.00%
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
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
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
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
41
97.62%
5
83.33%
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
42
72.41%
1
50.00%
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
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
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, "unexpected OSD op: object_no %016llx opcode %d",
			 obj_request->object_no, opcode);
		break;
	}

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
169
68.42%
11
55.00%
Ilya Dryomov
41
16.60%
5
25.00%
Sage Weil
18
7.29%
1
5.00%
Guangliang Zhao
15
6.07%
1
5.00%
Yan, Zheng
3
1.21%
1
5.00%
Christoph Hellwig
1
0.40%
1
5.00%
Total
247
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
26
68.42%
3
60.00%
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
28
82.35%
3
75.00%
Ilya Dryomov
6
17.65%
1
25.00%
Total
34
100.00%
4
100.00%


static struct ceph_osd_request *

__rbd_osd_req_create(struct rbd_device *rbd_dev,
		     struct ceph_snap_context *snapc,
		     int num_ops, unsigned int flags,
		     struct rbd_obj_request *obj_request)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct ceph_osd_request *req;
	const char *name_format = rbd_dev->image_format == 1 ?
				      RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT;

	req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, GFP_NOIO);
	if (!req)
		return NULL;

	req->r_flags = flags;
	req->r_callback = rbd_osd_req_callback;
	req->r_priv = obj_request;

	req->r_base_oloc.pool = rbd_dev->layout.pool_id;
	if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format,
			rbd_dev->header.object_prefix, obj_request->object_no))
		goto err_req;

	if (ceph_osdc_alloc_messages(req, GFP_NOIO))
		goto err_req;

	return req;

err_req:
	ceph_osdc_put_request(req);
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
97
57.40%
8
61.54%
Alex Elder
69
40.83%
3
23.08%
Yan, Zheng
2
1.18%
1
7.69%
David Disseldorp
1
0.59%
1
7.69%
Total
169
100.00%
13
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;

	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));

	return __rbd_osd_req_create(rbd_dev, snapc, num_ops,
	    (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) ?
	    CEPH_OSD_FLAG_WRITE : CEPH_OSD_FLAG_READ, obj_request);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
66
47.48%
5
41.67%
Guangliang Zhao
44
31.65%
2
16.67%
Ilya Dryomov
29
20.86%
5
41.67%
Total
139
100.00%
12
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;
	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;

	return __rbd_osd_req_create(img_request->rbd_dev,
				    img_request->snapc, num_osd_ops,
				    CEPH_OSD_FLAG_WRITE, obj_request);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
57
67.86%
1
25.00%
Josh Durgin
22
26.19%
1
25.00%
Ilya Dryomov
5
5.95%
2
50.00%
Total
84
100.00%
4
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
16
100.00%
3
100.00%
Total
16
100.00%
3
100.00%


static struct rbd_obj_request *

rbd_obj_request_create(enum obj_request_type type)
{
	struct rbd_obj_request *obj_request;

	rbd_assert(obj_request_type_valid(type));

	obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO);
	if (!obj_request)
		return NULL;

	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 %p\n", __func__, obj_request);
	return obj_request;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
88
97.78%
6
75.00%
Ilya Dryomov
2
2.22%
2
25.00%
Total
90
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;
	}

	kmem_cache_free(rbd_obj_request_cache, obj_request);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
136
95.10%
7
87.50%
Ilya Dryomov
7
4.90%
1
12.50%
Total
143
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
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
57
98.28%
1
50.00%
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
50
65.79%
1
33.33%
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
179
83.26%
10
71.43%
Guangliang Zhao
30
13.95%
2
14.29%
Josh Durgin
5
2.33%
1
7.14%
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
113
95.76%
9
90.00%
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
85
96.59%
2
50.00%
Josh Durgin
2
2.27%
1
25.00%
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
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
184
76.03%
3
37.50%
Guangliang Zhao
34
14.05%
2
25.00%
Christoph Hellwig
15
6.20%
1
12.50%
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
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
232
70.30%
2
16.67%
Alex Elder
46
13.94%
4
33.33%
Ilya Dryomov
30
9.09%
2
16.67%
Guangliang Zhao
19
5.76%
2
16.67%
Yan, Zheng
2
0.61%
1
8.33%
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;
		u64 object_no = img_offset >> rbd_dev->header.obj_order;
		u64 offset = rbd_segment_offset(rbd_dev, img_offset);
		u64 length = rbd_segment_length(rbd_dev, img_offset, resid);

		obj_request = rbd_obj_request_create(type);
		if (!obj_request)
			goto out_unwind;

		obj_request->object_no = object_no;
		obj_request->offset = offset;
		obj_request->length = length;

		/*
                 * 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
264
60.14%
3
13.04%
Alex Elder
113
25.74%
11
47.83%
Ilya Dryomov
39
8.88%
6
26.09%
Guangliang Zhao
22
5.01%
2
8.70%
David Disseldorp
1
0.23%
1
4.35%
Total
439
100.00%
23
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
131
88.51%
3
60.00%
Ilya Dryomov
11
7.43%
1
20.00%
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
290
92.95%
7
63.64%
Josh Durgin
12
3.85%
1
9.09%
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 = rbd_obj_bytes(&rbd_dev->header);

	/*
         * 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
266
96.03%
4
66.67%
Ilya Dryomov
11
3.97%
2
33.33%
Total
277
100.00%
6
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
176
93.62%
4
57.14%
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_PAGES);
	if (!stat_request)
		return -ENOMEM;

	stat_request->object_no = obj_request->object_no;

	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
138
58.72%
1
20.00%
Ilya Dryomov
97
41.28%
4
80.00%
Total
235
100.00%
5
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
Ilya Dryomov
42
37.17%
3
30.00%
Alex Elder
42
37.17%
5
50.00%
Guangliang Zhao
23
20.35%
1
10.00%
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
43
58.11%
3
50.00%
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
53
71.62%
6
85.71%
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
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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
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
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CommitProp
Ilya Dryomov
33
94.29%
2
66.67%
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
38
67.86%
2
33.33%
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
45
83.33%
2
50.00%
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
38
86.36%
2
66.67%
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
92
74.80%
3
60.00%
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
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
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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
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CommitProp
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
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CommitProp
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
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CommitProp
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
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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
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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
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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
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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;
}

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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;
}

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146
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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));
	}
}

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183
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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;
}

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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);
}

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47
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1
100.00%
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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);
}

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167
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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);
}

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196
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1
100.00%
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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;
}

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169
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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);
}

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131
99.24%
2
66.67%
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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);
}

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37
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1
100.00%
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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);
}

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43
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1
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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;
	}
}

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Ilya Dryomov
293
96.38%
3
75.00%
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);
}

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Ilya Dryomov
74
69.16%
4
57.14%
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;
}

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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;
}

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Alex Elder
39
52.70%
1
16.67%
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;
}

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Ilya Dryomov
74
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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);
}

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60
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3
100.00%
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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);
}

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74
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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);
}

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Ilya Dryomov
260
94.20%
11
91.67%
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,
			     struct ceph_object_id *oid,
			     struct ceph_object_locator *oloc,
			     const char *method_name,
			     const void *outbound,
			     size_t outbound_size,
			     void *inbound,
			     size_t inbound_size)
{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct page *req_page = NULL;
	struct page *reply_page;
	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.
         */
	if (outbound) {
		if (outbound_size > PAGE_SIZE)
			return -E2BIG;

		req_page = alloc_page(GFP_KERNEL);
		if (!req_page)
			return -ENOMEM;

		memcpy(page_address(req_page), outbound, outbound_size);
	}

	reply_page = alloc_page(GFP_KERNEL);
	if (!reply_page) {
		if (req_page)
			__free_page(req_page);
		return -ENOMEM;
	}

	ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name,
			     CEPH_OSD_FLAG_READ, req_page, outbound_size,
			     reply_page, &inbound_size);
	if (!ret) {
		memcpy(inbound, page_address(reply_page), inbound_size);
		ret = inbound_size;
	}

	if (req_page)
		__free_page(req_page);
	__free_page(reply_page);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
111
53.37%
8
80.00%
Ilya Dryomov
97
46.63%
2
20.00%
Total
208
100.00%
10
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
105
99.06%
2
66.67%
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;

	switch (req_op(rq)) {
	case REQ_OP_DISCARD:
		op_type = OBJ_OP_DISCARD;
		break;
	case REQ_OP_WRITE:
		op_type = OBJ_OP_WRITE;
		break;
	case REQ_OP_READ:
		op_type = OBJ_OP_READ;
		break;
	default:
		dout("%s: non-fs request type %d\n", __func__, req_op(rq));
		result = -EIO;
		goto err;
	}

	/* 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
199
32.25%
14
48.28%
Ilya Dryomov
195
31.60%
5
17.24%
Christoph Hellwig
82
13.29%
2
6.90%
Josh Durgin
75
12.16%
3
10.34%
Guangliang Zhao
39
6.32%
3
10.34%
Yehuda Sadeh Weinraub
27
4.38%
2
6.90%
Total
617
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
25
54.35%
2
50.00%
Christoph Hellwig
20
43.48%
1
25.00%
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 Weinraub
57
78.08%
1
33.33%
Christoph Hellwig
8
10.96%
1
33.33%
Alex Elder
8
10.96%
1
33.33%
Total
73
100.00%
3
100.00%



static int rbd_obj_read_sync(struct rbd_device *rbd_dev,
			     struct ceph_object_id *oid,
			     struct ceph_object_locator *oloc,
			     void *buf, int buf_len)

{
	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
	struct ceph_osd_request *req;
	struct page **pages;
	int num_pages = calc_pages_for(0, buf_len);
	int ret;

	req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	ceph_oid_copy(&req->r_base_oid, oid);
	ceph_oloc_copy(&req->r_base_oloc, oloc);
	req->r_flags = CEPH_OSD_FLAG_READ;

	ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
	if (ret)
		goto out_req;

	pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
	if (IS_ERR(pages)) {
		ret = PTR_ERR(pages);
		goto out_req;
	}

	osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0);
	osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false,
					 true);

	ceph_osdc_start_request(osdc, req, false);
	ret = ceph_osdc_wait_request(osdc, req);
	if (ret >= 0)
		ceph_copy_from_page_vector(pages, buf, 0, ret);

out_req:
	ceph_osdc_put_request(req);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
123
51.46%
10
76.92%
Ilya Dryomov
115
48.12%
2
15.38%
Jan Kara
1
0.42%
1
7.69%
Total
239
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,
					&rbd_dev->header_oloc, ondisk, size);
		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
119
54.34%
8
53.33%
Yehuda Sadeh Weinraub
83
37.90%
3
20.00%
Ilya Dryomov
8
3.65%
2
13.33%
Josh Durgin
8
3.65%
1
6.67%
Xi Wang
1
0.46%
1
6.67%
Total
219
100.00%
15
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
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
72
88.89%
1
50.00%
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
68
50.75%
9
60.00%
Ilya Dryomov
65
48.51%
5
33.33%
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
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
117
28.75%
1
5.00%
Yehuda Sadeh Weinraub
116
28.50%
1
5.00%
Ilya Dryomov
51
12.53%
7
35.00%
Josh Durgin
42
10.32%
2
10.00%
Guangliang Zhao
24
5.90%
1
5.00%
Alex Elder
23
5.65%
4
20.00%
Ronny Hegewald
21
5.16%
1
5.00%
Sage Weil
8
1.97%
1
5.00%
Jens Axboe
4
0.98%
1
5.00%
Jan Kara
1
0.25%
1
5.00%
Total
407
100.00%
20
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
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 Weinraub
43
87.76%
2
40.00%
Alex Elder
5
10.20%
2
40.00%
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
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 Weinraub
41
73.21%
2
50.00%
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
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
38
59.38%
1
50.00%
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 Weinraub
41
87.23%
2
33.33%
Alex Elder
5
10.64%
3
50.00%
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
39
82.98%
1
50.00%
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 Weinraub
38
90.48%
2
50.00%
Michael Christie
3
7.14%
1
25.00%
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 Weinraub
41
93.18%
1
33.33%
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
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 Weinraub
40
66.67%
1
20.00%
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
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 Weinraub
41
93.18%
1
33.33%
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
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
86
64.66%
1
50.00%
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 Weinraub
44
81.48%
1
16.67%
Alex Elder
8
14.81%
4
66.67%
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 const 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 Weinraub
12
50.00%
1
50.00%
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
23
92.00%
1
50.00%
Yehuda Sadeh Weinraub
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
33
55.93%
1
33.33%
Yehuda Sadeh Weinraub
14
23.73%
1
33.33%
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
55
93.22%
3
75.00%
Yehuda Sadeh Weinraub
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
53
67.95%
6
54.55%
Alex Elder
16
20.51%
3
27.27%
Michael Christie
5
6.41%
1
9.09%
Yehuda Sadeh Weinraub
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
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);

	rbd_dev->header.data_pool_id = CEPH_NOPOOL;
	ceph_oid_init(&rbd_dev->header_oid);
	rbd_dev->header_oloc.pool = spec->pool_id;

	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;

	return rbd_dev;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
137
59.57%
9
64.29%
Alex Elder
93
40.43%
5
35.71%
Total
230
100.00%
14
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
158
94.61%
2
28.57%
Alex Elder
6
3.59%
4
57.14%
Yan, Zheng
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 Weinraub
10
43.48%
1
25.00%
Ilya Dryomov
7
30.43%
2
50.00%
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,
				  &rbd_dev->header_oloc, "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
136
76.40%
5
55.56%
Yehuda Sadeh Weinraub
21
11.80%
1
11.11%
Josh Durgin
15
8.43%
1
11.11%
Ilya Dryomov
6
3.37%
2
22.22%
Total
178
100.00%
9
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
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,
				  &rbd_dev->header_oloc, "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
163
96.45%
3
60.00%
Ilya Dryomov
6
3.55%
2
40.00%
Total
169
100.00%
5
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,
				  &rbd_dev->header_oloc, "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
172
88.21%
7
70.00%
Ilya Dryomov
23
11.79%
3
30.00%
Total
195
100.00%
10
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
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,
				  &rbd_dev->header_oloc, "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
416
91.63%
11
64.71%
Ilya Dryomov
38
8.37%
6
35.29%
Total
454
100.00%
17
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,
				&rbd_dev->header_oloc, "get_stripe_unit_count",
				NULL, 0, &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 = rbd_obj_bytes(&rbd_dev->header);
	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
204
95.33%
2
40.00%
Ilya Dryomov
10
4.67%
3
60.00%
Total
214
100.00%
5
100.00%



static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev)
{
	__le64 data_pool_id;
	int ret;

	ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
				  &rbd_dev->header_oloc, "get_data_pool",
				  NULL, 0, &data_pool_id, sizeof(data_pool_id));
	if (ret < 0)
		return ret;
	if (ret < sizeof(data_pool_id))
		return -EBADMSG;

	rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id);
	WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
64
67.37%
1
33.33%
Alex Elder
31
32.63%
2
66.67%
Total
95
100.00%
3
100.00%



static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
{
	CEPH_DEFINE_OID_ONSTACK(oid);
	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;

	ceph_oid_printf(&oid, "%s", RBD_DIRECTORY);
	ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc,
				  "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
243
92.05%
6
85.71%
Ilya Dryomov
21
7.95%
1
14.29%
Total
264
100.00%
7
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
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
111
88.10%
1
50.00%
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
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
78
73.58%
4
80.00%
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
134
61.47%
5
71.43%
Ilya Dryomov
77
35.32%
1
14.29%
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,
				  &rbd_dev->header_oloc, "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
315
98.13%
7
77.78%
Ilya Dryomov
6
1.87%
2
22.22%
Total
321
100.00%
9
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,
				  &rbd_dev->header_oloc, "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
173
89.18%
12
80.00%
Yehuda Sadeh Weinraub
15
7.73%
1
6.67%
Ilya Dryomov
6
3.09%
2
13.33%
Total
194
100.00%
15
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
59
62.77%
6
66.67%
Ilya Dryomov
22
23.40%
1
11.11%
Josh Durgin
11
11.70%
1
11.11%
Yehuda Sadeh Weinraub
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
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
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
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
449
97.40%
19
90.48%
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
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;
	CEPH_DEFINE_OID_ONSTACK(oid);
	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.
         */
	ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX,
			       rbd_dev->spec->image_name);
	if (ret)
		return ret;

	dout("rbd id object name is %s\n", oid.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, &oid, &rbd_dev->header_oloc,
				  "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);
	ceph_oid_destroy(&oid);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
258
88.97%
8
72.73%
Ilya Dryomov
31
10.69%
2
18.18%
Duan Jiong
1
0.34%
1
9.09%
Total
290
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
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;
	}

	if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) {
		ret = rbd_dev_v2_data_pool(rbd_dev);
		if (ret)
			goto out_err;
	}

	rbd_init_layout(rbd_dev);
	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
105
77.21%
11
84.62%
Ilya Dryomov
31
22.79%
2
15.38%
Total
136
100.00%
13
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
99
64.71%
6
66.67%
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
165
56.90%
6
42.86%
Ilya Dryomov
112
38.62%
7
50.00%
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));
	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
72
83.72%
1
50.00%
Ilya Dryomov
14
16.28%
1
50.00%
Total
86
100.00%
2
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
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
160
54.98%
13
65.00%
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
190
50.53%
26
66.67%
Ilya Dryomov
80
21.28%
10
25.64%
Yehuda Sadeh Weinraub
68
18.09%
2
5.13%
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
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
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
35
46.67%
3
27.27%
Alex Elder
25
33.33%
6
54.55%
Yehuda Sadeh Weinraub
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
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
115
35.94%
8
50.00%
Michael Christie
98
30.62%
1
6.25%
Yehuda Sadeh Weinraub
71
22.19%
2
12.50%
Ilya Dryomov
31
9.69%
4
25.00%
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
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
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 Weinraub
36
70.59%
2
66.67%
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 Weinraub
16
80.00%
2
66.67%
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;

	return 0;

out_err:
	kmem_cache_destroy(rbd_img_request_cache);
	rbd_img_request_cache = NULL;
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alex Elder
71
97.26%
3
75.00%
Geliang Tang
2
2.74%
1
25.00%
Total
73
100.00%
4
100.00%



static void rbd_slab_exit(void)
{
	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
36
100.00%
2
100.00%
Total
36
100.00%
2
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
101
62.35%
5
55.56%
Alex Elder
33
20.37%
3
33.33%
Yehuda Sadeh Weinraub
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
22
59.46%
3
50.00%
Yehuda Sadeh Weinraub
11
29.73%
1
16.67%
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
13604
51.79%
261
60.56%
Ilya Dryomov
8062
30.69%
104
24.13%
Yehuda Sadeh Weinraub
2287
8.71%
4
0.93%
Josh Durgin
973
3.70%
24
5.57%
Guangliang Zhao
621
2.36%
4
0.93%
Christoph Hellwig
315
1.20%
2
0.46%
Michael Christie
252
0.96%
4
0.93%
Sage Weil
33
0.13%
4
0.93%
Greg Kroah-Hartman
30
0.11%
1
0.23%
Ronny Hegewald
21
0.08%
1
0.23%
Kent Overstreet
20
0.08%
3
0.70%
Yan, Zheng
10
0.04%
4
0.93%
Vasiliy Kulikov
7
0.03%
1
0.23%
Himangi Saraogi
6
0.02%
1
0.23%
Peter Zijlstra
4
0.02%
1
0.23%
SF Markus Elfring
4
0.02%
1
0.23%
Jens Axboe
4
0.02%
1
0.23%
Geert Uytterhoeven
3
0.01%
1
0.23%
David Disseldorp
2
0.01%
1
0.23%
Geliang Tang
2
0.01%
1
0.23%
Jan Kara
2
0.01%
2
0.46%
Dan Carpenter
1
0.00%
1
0.23%
Xi Wang
1
0.00%
1
0.23%
Duan Jiong
1
0.00%
1
0.23%
Bhumika Goyal
1
0.00%
1
0.23%
Al Viro
1
0.00%
1
0.23%
Total
26267
100.00%
431
100.00%
Directory: drivers/block

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