cregit-Linux how code gets into the kernel

Release 4.11 fs/orangefs/orangefs-kernel.h

Directory: fs/orangefs
/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */

/*
 *  The ORANGEFS Linux kernel support allows ORANGEFS volumes to be mounted and
 *  accessed through the Linux VFS (i.e. using standard I/O system calls).
 *  This support is only needed on clients that wish to mount the file system.
 *
 */

/*
 *  Declarations and macros for the ORANGEFS Linux kernel support.
 */

#ifndef __ORANGEFSKERNEL_H

#define __ORANGEFSKERNEL_H

#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/statfs.h>
#include <linux/backing-dev.h>
#include <linux/device.h>
#include <linux/mpage.h>
#include <linux/namei.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/vmalloc.h>

#include <linux/aio.h>
#include <linux/posix_acl.h>
#include <linux/posix_acl_xattr.h>
#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
#include <linux/uio.h>
#include <linux/sched/signal.h>
#include <linux/mm.h>
#include <linux/wait.h>
#include <linux/dcache.h>
#include <linux/pagemap.h>
#include <linux/poll.h>
#include <linux/rwsem.h>
#include <linux/xattr.h>
#include <linux/exportfs.h>

#include <asm/unaligned.h>

#include "orangefs-dev-proto.h"

#ifdef ORANGEFS_KERNEL_DEBUG

#define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS       10
#else

#define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS       20
#endif


#define ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS   30


#define ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS     900	
/* 15 minutes */


#define ORANGEFS_REQDEVICE_NAME          "pvfs2-req"


#define ORANGEFS_DEVREQ_MAGIC             0x20030529

#define ORANGEFS_LINK_MAX                 0x000000FF

#define ORANGEFS_PURGE_RETRY_COUNT     0x00000005

#define ORANGEFS_MAX_NUM_OPTIONS          0x00000004

#define ORANGEFS_MAX_MOUNT_OPT_LEN        0x00000080

#define ORANGEFS_MAX_FSKEY_LEN            64


#define MAX_DEV_REQ_UPSIZE (2 * sizeof(__s32) +   \
sizeof(__u64) + sizeof(struct orangefs_upcall_s))

#define MAX_DEV_REQ_DOWNSIZE (2 * sizeof(__s32) + \
sizeof(__u64) + sizeof(struct orangefs_downcall_s))

/*
 * valid orangefs kernel operation states
 *
 * unknown  - op was just initialized
 * waiting  - op is on request_list (upward bound)
 * inprogr  - op is in progress (waiting for downcall)
 * serviced - op has matching downcall; ok
 * purged   - op has to start a timer since client-core
 *            exited uncleanly before servicing op
 * given up - submitter has given up waiting for it
 */

enum orangefs_vfs_op_states {
	
OP_VFS_STATE_UNKNOWN = 0,
	
OP_VFS_STATE_WAITING = 1,
	
OP_VFS_STATE_INPROGR = 2,
	
OP_VFS_STATE_SERVICED = 4,
	
OP_VFS_STATE_PURGED = 8,
	
OP_VFS_STATE_GIVEN_UP = 16,
};

/*
 * orangefs kernel memory related flags
 */

#if ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB))

#define ORANGEFS_CACHE_CREATE_FLAGS SLAB_RED_ZONE
#else

#define ORANGEFS_CACHE_CREATE_FLAGS 0
#endif /* ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB)) */

extern int orangefs_init_acl(struct inode *inode, struct inode *dir);
extern const struct xattr_handler *orangefs_xattr_handlers[];

extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type);
extern int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type);

/*
 * Redefine xtvec structure so that we could move helper functions out of
 * the define
 */

struct xtvec {
	
__kernel_off_t xtv_off;		/* must be off_t */
	
__kernel_size_t xtv_len;	/* must be size_t */
};

/*
 * orangefs data structures
 */

struct orangefs_kernel_op_s {
	
enum orangefs_vfs_op_states op_state;
	
__u64 tag;

	/*
         * Set uses_shared_memory to non zero if this operation uses
         * shared memory. If true, then a retry on the op must also
         * get a new shared memory buffer and re-populate it.
         * Cancels don't care - it only matters for service_operation()
         * retry logics and cancels don't go through it anymore. It
         * safely stays non-zero when we use it as slot_to_free.
         */
	union {
		
int uses_shared_memory;
		
int slot_to_free;
	};

	
struct orangefs_upcall_s upcall;
	
struct orangefs_downcall_s downcall;

	
struct completion waitq;
	
spinlock_t lock;

	
int attempts;

	
struct list_head list;
};


#define set_op_state_waiting(op)     ((op)->op_state = OP_VFS_STATE_WAITING)

#define set_op_state_inprogress(op)  ((op)->op_state = OP_VFS_STATE_INPROGR)

#define set_op_state_given_up(op)  ((op)->op_state = OP_VFS_STATE_GIVEN_UP)



static inline void set_op_state_serviced(struct orangefs_kernel_op_s *op)
{
	op->op_state = OP_VFS_STATE_SERVICED;
	complete(&op->waitq);
}


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#define op_state_waiting(op)     ((op)->op_state & OP_VFS_STATE_WAITING)

#define op_state_in_progress(op) ((op)->op_state & OP_VFS_STATE_INPROGR)

#define op_state_serviced(op)    ((op)->op_state & OP_VFS_STATE_SERVICED)

#define op_state_purged(op)      ((op)->op_state & OP_VFS_STATE_PURGED)

#define op_state_given_up(op)    ((op)->op_state & OP_VFS_STATE_GIVEN_UP)

#define op_is_cancel(op)         ((op)->upcall.type == ORANGEFS_VFS_OP_CANCEL)

void op_release(struct orangefs_kernel_op_s *op);

extern void orangefs_bufmap_put(int);



static inline void put_cancel(struct orangefs_kernel_op_s *op)
{
	orangefs_bufmap_put(op->slot_to_free);
	op_release(op);
}


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static inline void set_op_state_purged(struct orangefs_kernel_op_s *op)
{
	spin_lock(&op->lock);
	if (unlikely(op_is_cancel(op))) {
		list_del_init(&op->list);
		spin_unlock(&op->lock);
		put_cancel(op);
	} else {
		op->op_state |= OP_VFS_STATE_PURGED;
		complete(&op->waitq);
		spin_unlock(&op->lock);
	}
}


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/* per inode private orangefs info */

struct orangefs_inode_s {
	
struct orangefs_object_kref refn;
	
char link_target[ORANGEFS_NAME_MAX];
	
__s64 blksize;
	/*
         * Reading/Writing Extended attributes need to acquire the appropriate
         * reader/writer semaphore on the orangefs_inode_s structure.
         */
	
struct rw_semaphore xattr_sem;

	
struct inode vfs_inode;
	
sector_t last_failed_block_index_read;

	/*
         * State of in-memory attributes not yet flushed to disk associated
         * with this object
         */
	
unsigned long pinode_flags;

	
unsigned long getattr_time;
};


#define P_ATIME_FLAG 0

#define P_MTIME_FLAG 1

#define P_CTIME_FLAG 2

#define P_MODE_FLAG  3


#define ClearAtimeFlag(pinode) clear_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)

#define SetAtimeFlag(pinode)   set_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)

#define AtimeFlag(pinode)      test_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)


#define ClearMtimeFlag(pinode) clear_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)

#define SetMtimeFlag(pinode)   set_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)

#define MtimeFlag(pinode)      test_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)


#define ClearCtimeFlag(pinode) clear_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)

#define SetCtimeFlag(pinode)   set_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)

#define CtimeFlag(pinode)      test_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)


#define ClearModeFlag(pinode) clear_bit(P_MODE_FLAG, &(pinode)->pinode_flags)

#define SetModeFlag(pinode)   set_bit(P_MODE_FLAG, &(pinode)->pinode_flags)

#define ModeFlag(pinode)      test_bit(P_MODE_FLAG, &(pinode)->pinode_flags)

/* per superblock private orangefs info */

struct orangefs_sb_info_s {
	
struct orangefs_khandle root_khandle;
	
__s32 fs_id;
	
int id;
	
int flags;

#define ORANGEFS_OPT_INTR	0x01

#define ORANGEFS_OPT_LOCAL_LOCK	0x02
	
char devname[ORANGEFS_MAX_SERVER_ADDR_LEN];
	
struct super_block *sb;
	
int mount_pending;
	
int no_list;
	
struct list_head list;
};

/*
 * structure that holds the state of any async I/O operation issued
 * through the VFS. Needed especially to handle cancellation requests
 * or even completion notification so that the VFS client-side daemon
 * can free up its vfs_request slots.
 */

struct orangefs_kiocb_s {
	/* the pointer to the task that initiated the AIO */
	
struct task_struct *tsk;

	/* pointer to the kiocb that kicked this operation */
	
struct kiocb *kiocb;

	/* buffer index that was used for the I/O */
	
struct orangefs_bufmap *bufmap;
	
int buffer_index;

	/* orangefs kernel operation type */
	
struct orangefs_kernel_op_s *op;

	/* The user space buffers from/to which I/O is being staged */
	
struct iovec *iov;

	/* number of elements in the iovector */
	
unsigned long nr_segs;

	/* set to indicate the type of the operation */
	
int rw;

	/* file offset */
	
loff_t offset;

	/* and the count in bytes */
	
size_t bytes_to_be_copied;

	
ssize_t bytes_copied;
	
int needs_cleanup;
};


struct orangefs_stats {
	
unsigned long cache_hits;
	
unsigned long cache_misses;
	
unsigned long reads;
	
unsigned long writes;
};

extern struct orangefs_stats orangefs_stats;

/*
 * NOTE: See Documentation/filesystems/porting for information
 * on implementing FOO_I and properly accessing fs private data
 */



static inline struct orangefs_inode_s *ORANGEFS_I(struct inode *inode)
{
	return container_of(inode, struct orangefs_inode_s, vfs_inode);
}


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static inline struct orangefs_sb_info_s *ORANGEFS_SB(struct super_block *sb)
{
	return (struct orangefs_sb_info_s *) sb->s_fs_info;
}


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/* ino_t descends from "unsigned long", 8 bytes, 64 bits. */



static inline ino_t orangefs_khandle_to_ino(struct orangefs_khandle *khandle)
{
	union {
		unsigned char u[8];
		__u64 ino;
	} ihandle;

	ihandle.u[0] = khandle->u[0] ^ khandle->u[4];
	ihandle.u[1] = khandle->u[1] ^ khandle->u[5];
	ihandle.u[2] = khandle->u[2] ^ khandle->u[6];
	ihandle.u[3] = khandle->u[3] ^ khandle->u[7];
	ihandle.u[4] = khandle->u[12] ^ khandle->u[8];
	ihandle.u[5] = khandle->u[13] ^ khandle->u[9];
	ihandle.u[6] = khandle->u[14] ^ khandle->u[10];
	ihandle.u[7] = khandle->u[15] ^ khandle->u[11];

	return ihandle.ino;
}


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static inline struct orangefs_khandle *get_khandle_from_ino(struct inode *inode)
{
	return &(ORANGEFS_I(inode)->refn.khandle);
}


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static inline __s32 get_fsid_from_ino(struct inode *inode)
{
	return ORANGEFS_I(inode)->refn.fs_id;
}


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static inline ino_t get_ino_from_khandle(struct inode *inode)
{
	struct orangefs_khandle *khandle;
	ino_t ino;

	khandle = get_khandle_from_ino(inode);
	ino = orangefs_khandle_to_ino(khandle);
	return ino;
}


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static inline ino_t get_parent_ino_from_dentry(struct dentry *dentry)
{
	return get_ino_from_khandle(dentry->d_parent->d_inode);
}


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static inline int is_root_handle(struct inode *inode)
{
	gossip_debug(GOSSIP_DCACHE_DEBUG,
		     "%s: root handle: %pU, this handle: %pU:\n",
		     __func__,
		     &ORANGEFS_SB(inode->i_sb)->root_khandle,
		     get_khandle_from_ino(inode));

	if (ORANGEFS_khandle_cmp(&(ORANGEFS_SB(inode->i_sb)->root_khandle),
			     get_khandle_from_ino(inode)))
		return 0;
	else
		return 1;
}


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static inline int match_handle(struct orangefs_khandle resp_handle,
			       struct inode *inode)
{
	gossip_debug(GOSSIP_DCACHE_DEBUG,
		     "%s: one handle: %pU, another handle:%pU:\n",
		     __func__,
		     &resp_handle,
		     get_khandle_from_ino(inode));

	if (ORANGEFS_khandle_cmp(&resp_handle, get_khandle_from_ino(inode)))
		return 0;
	else
		return 1;
}


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/*
 * defined in orangefs-cache.c
 */
int op_cache_initialize(void);
int op_cache_finalize(void);
struct orangefs_kernel_op_s *op_alloc(__s32 type);
void orangefs_new_tag(struct orangefs_kernel_op_s *op);
char *get_opname_string(struct orangefs_kernel_op_s *new_op);

int orangefs_inode_cache_initialize(void);
int orangefs_inode_cache_finalize(void);

/*
 * defined in orangefs-mod.c
 */
void purge_inprogress_ops(void);

/*
 * defined in waitqueue.c
 */
void purge_waiting_ops(void);

/*
 * defined in super.c
 */
extern uint64_t orangefs_features;

struct dentry *orangefs_mount(struct file_system_type *fst,
			   int flags,
			   const char *devname,
			   void *data);

void orangefs_kill_sb(struct super_block *sb);
int orangefs_remount(struct orangefs_sb_info_s *);

int fsid_key_table_initialize(void);
void fsid_key_table_finalize(void);

/*
 * defined in inode.c
 */
__u32 convert_to_orangefs_mask(unsigned long lite_mask);
struct inode *orangefs_new_inode(struct super_block *sb,
			      struct inode *dir,
			      int mode,
			      dev_t dev,
			      struct orangefs_object_kref *ref);

int orangefs_setattr(struct dentry *dentry, struct iattr *iattr);

int orangefs_getattr(const struct path *path, struct kstat *stat,
		     u32 request_mask, unsigned int flags);

int orangefs_permission(struct inode *inode, int mask);

/*
 * defined in xattr.c
 */
int orangefs_setxattr(struct dentry *dentry,
		   const char *name,
		   const void *value,
		   size_t size,
		   int flags);

ssize_t orangefs_getxattr(struct dentry *dentry,
		       const char *name,
		       void *buffer,
		       size_t size);

ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size);

/*
 * defined in namei.c
 */
struct inode *orangefs_iget(struct super_block *sb,
			 struct orangefs_object_kref *ref);

ssize_t orangefs_inode_read(struct inode *inode,
			    struct iov_iter *iter,
			    loff_t *offset,
			    loff_t readahead_size);

/*
 * defined in devorangefs-req.c
 */
extern uint32_t orangefs_userspace_version;

int orangefs_dev_init(void);
void orangefs_dev_cleanup(void);
int is_daemon_in_service(void);
bool __is_daemon_in_service(void);

/*
 * defined in orangefs-utils.c
 */
__s32 fsid_of_op(struct orangefs_kernel_op_s *op);

int orangefs_flush_inode(struct inode *inode);

ssize_t orangefs_inode_getxattr(struct inode *inode,
			     const char *name,
			     void *buffer,
			     size_t size);

int orangefs_inode_setxattr(struct inode *inode,
			 const char *name,
			 const void *value,
			 size_t size,
			 int flags);

int orangefs_inode_getattr(struct inode *inode, int new, int bypass);

int orangefs_inode_check_changed(struct inode *inode);

int orangefs_inode_setattr(struct inode *inode, struct iattr *iattr);

void orangefs_make_bad_inode(struct inode *inode);

int orangefs_unmount_sb(struct super_block *sb);

bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op);

int orangefs_normalize_to_errno(__s32 error_code);

extern struct mutex orangefs_request_mutex;
extern int op_timeout_secs;
extern int slot_timeout_secs;
extern int orangefs_dcache_timeout_msecs;
extern int orangefs_getattr_timeout_msecs;
extern struct list_head orangefs_superblocks;
extern spinlock_t orangefs_superblocks_lock;
extern struct list_head orangefs_request_list;
extern spinlock_t orangefs_request_list_lock;
extern wait_queue_head_t orangefs_request_list_waitq;
extern struct list_head *orangefs_htable_ops_in_progress;
extern spinlock_t orangefs_htable_ops_in_progress_lock;
extern int hash_table_size;

extern const struct address_space_operations orangefs_address_operations;
extern const struct inode_operations orangefs_file_inode_operations;
extern const struct file_operations orangefs_file_operations;
extern const struct inode_operations orangefs_symlink_inode_operations;
extern const struct inode_operations orangefs_dir_inode_operations;
extern const struct file_operations orangefs_dir_operations;
extern const struct dentry_operations orangefs_dentry_operations;
extern const struct file_operations orangefs_devreq_file_operations;

extern wait_queue_head_t orangefs_bufmap_init_waitq;

/*
 * misc convenience macros
 */


#define ORANGEFS_OP_INTERRUPTIBLE 1   
/* service_operation() is interruptible */

#define ORANGEFS_OP_PRIORITY      2   
/* service_operation() is high priority */

#define ORANGEFS_OP_CANCELLATION  4   
/* this is a cancellation */

#define ORANGEFS_OP_NO_MUTEX      8   
/* don't acquire request_mutex */

#define ORANGEFS_OP_ASYNC         16  
/* Queue it, but don't wait */

int service_operation(struct orangefs_kernel_op_s *op,
		      const char *op_name,
		      int flags);


#define get_interruptible_flag(inode) \
	((ORANGEFS_SB(inode->i_sb)->flags & ORANGEFS_OPT_INTR) ? \
                ORANGEFS_OP_INTERRUPTIBLE : 0)


#define fill_default_sys_attrs(sys_attr, type, mode)			\
do {                                                                    \
        sys_attr.owner = from_kuid(&init_user_ns, current_fsuid()); \
        sys_attr.group = from_kgid(&init_user_ns, current_fsgid()); \
        sys_attr.perms = ORANGEFS_util_translate_mode(mode);            \
        sys_attr.mtime = 0;                                             \
        sys_attr.atime = 0;                                             \
        sys_attr.ctime = 0;                                             \
        sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE;                  \
} while (0)




static inline void orangefs_i_size_write(struct inode *inode, loff_t i_size)
{
#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
	inode_lock(inode);
#endif
	i_size_write(inode, i_size);
#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
	inode_unlock(inode);
#endif
}


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static inline void orangefs_set_timeout(struct dentry *dentry)
{
	unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000;

	dentry->d_fsdata = (void *) time;
}


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#endif /* __ORANGEFSKERNEL_H */

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Directory: fs/orangefs



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