5 * This file has definitions for some important file table
9 #include <linux/config.h>
10 #include <linux/limits.h>
11 #include <linux/ioctl.h>
14 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
15 * the file limit at runtime and only root can increase the per-process
16 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
17 * upper limit on files-per-process.
19 * Some programs (notably those using select()) may have to be
20 * recompiled to take full advantage of the new limits..
23 /* Fixed constants first: */
25 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
26 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
28 #define BLOCK_SIZE_BITS 10
29 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
31 /* And dynamically-tunable limits and defaults: */
32 struct files_stat_struct
{
33 int nr_files
; /* read only */
34 int nr_free_files
; /* read only */
35 int max_files
; /* tunable */
37 extern struct files_stat_struct files_stat
;
38 extern int get_max_files(void);
40 struct inodes_stat_t
{
45 extern struct inodes_stat_t inodes_stat
;
47 extern int leases_enable
, lease_break_time
;
50 extern int dir_notify_enable
;
53 #define NR_FILE 8192 /* this can well be larger on a larger system */
63 /* Internal kernel extensions */
66 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
72 #define READA 2 /* read-ahead - don't block if no resources */
73 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
74 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
75 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
76 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
77 #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
83 /* public flags for file_system_type */
84 #define FS_REQUIRES_DEV 1
85 #define FS_BINARY_MOUNTDATA 2
86 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
87 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
88 * as nfs_rename() will be cleaned up
91 * These are the fs-independent mount-flags: up to 32 flags are supported
93 #define MS_RDONLY 1 /* Mount read-only */
94 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
95 #define MS_NODEV 4 /* Disallow access to device special files */
96 #define MS_NOEXEC 8 /* Disallow program execution */
97 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
98 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
99 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
100 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
101 #define MS_NOATIME 1024 /* Do not update access times. */
102 #define MS_NODIRATIME 2048 /* Do not update directory access times */
106 #define MS_VERBOSE 32768
107 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
108 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
109 #define MS_PRIVATE (1<<18) /* change to private */
110 #define MS_SLAVE (1<<19) /* change to slave */
111 #define MS_SHARED (1<<20) /* change to shared */
112 #define MS_ACTIVE (1<<30)
113 #define MS_NOUSER (1<<31)
116 * Superblock flags that can be altered by MS_REMOUNT
118 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
121 * Old magic mount flag and mask
123 #define MS_MGC_VAL 0xC0ED0000
124 #define MS_MGC_MSK 0xffff0000
126 /* Inode flags - they have nothing to superblock flags now */
128 #define S_SYNC 1 /* Writes are synced at once */
129 #define S_NOATIME 2 /* Do not update access times */
130 #define S_APPEND 4 /* Append-only file */
131 #define S_IMMUTABLE 8 /* Immutable file */
132 #define S_DEAD 16 /* removed, but still open directory */
133 #define S_NOQUOTA 32 /* Inode is not counted to quota */
134 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
135 #define S_NOCMTIME 128 /* Do not update file c/mtime */
136 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
137 #define S_PRIVATE 512 /* Inode is fs-internal */
140 * Note that nosuid etc flags are inode-specific: setting some file-system
141 * flags just means all the inodes inherit those flags by default. It might be
142 * possible to override it selectively if you really wanted to with some
143 * ioctl() that is not currently implemented.
145 * Exception: MS_RDONLY is always applied to the entire file system.
147 * Unfortunately, it is possible to change a filesystems flags with it mounted
148 * with files in use. This means that all of the inodes will not have their
149 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
150 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
152 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
154 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
155 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
156 ((inode)->i_flags & S_SYNC))
157 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
158 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
159 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
161 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
162 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
163 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
164 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
166 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
167 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
168 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
169 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
171 /* the read-only stuff doesn't really belong here, but any other place is
172 probably as bad and I don't want to create yet another include file. */
174 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
175 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
176 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
177 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
178 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
179 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
180 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
181 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
182 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
183 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
184 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
185 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
187 #define BLKPG _IO(0x12,105)/* See blkpg.h */
189 /* Some people are morons. Do not use sizeof! */
191 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
192 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
193 /* This was here just to show that the number is taken -
194 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
196 /* A jump here: 108-111 have been used for various private purposes. */
197 #define BLKBSZGET _IOR(0x12,112,size_t)
198 #define BLKBSZSET _IOW(0x12,113,size_t)
199 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
200 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
201 #define BLKTRACESTART _IO(0x12,116)
202 #define BLKTRACESTOP _IO(0x12,117)
203 #define BLKTRACETEARDOWN _IO(0x12,118)
205 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
206 #define FIBMAP _IO(0x00,1) /* bmap access */
207 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
211 #include <linux/linkage.h>
212 #include <linux/wait.h>
213 #include <linux/types.h>
214 #include <linux/kdev_t.h>
215 #include <linux/dcache.h>
216 #include <linux/stat.h>
217 #include <linux/cache.h>
218 #include <linux/kobject.h>
219 #include <linux/list.h>
220 #include <linux/radix-tree.h>
221 #include <linux/prio_tree.h>
222 #include <linux/init.h>
223 #include <linux/sched.h>
224 #include <linux/mutex.h>
226 #include <asm/atomic.h>
227 #include <asm/semaphore.h>
228 #include <asm/byteorder.h>
234 struct pipe_inode_info
;
235 struct poll_table_struct
;
237 struct vm_area_struct
;
240 extern void __init
inode_init(unsigned long);
241 extern void __init
inode_init_early(void);
242 extern void __init
mnt_init(unsigned long);
243 extern void __init
files_init(unsigned long);
246 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
247 struct buffer_head
*bh_result
, int create
);
248 typedef int (get_blocks_t
)(struct inode
*inode
, sector_t iblock
,
249 unsigned long max_blocks
,
250 struct buffer_head
*bh_result
, int create
);
251 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
252 ssize_t bytes
, void *private);
255 * Attribute flags. These should be or-ed together to figure out what
262 #define ATTR_ATIME 16
263 #define ATTR_MTIME 32
264 #define ATTR_CTIME 64
265 #define ATTR_ATIME_SET 128
266 #define ATTR_MTIME_SET 256
267 #define ATTR_FORCE 512 /* Not a change, but a change it */
268 #define ATTR_ATTR_FLAG 1024
269 #define ATTR_KILL_SUID 2048
270 #define ATTR_KILL_SGID 4096
271 #define ATTR_FILE 8192
274 * This is the Inode Attributes structure, used for notify_change(). It
275 * uses the above definitions as flags, to know which values have changed.
276 * Also, in this manner, a Filesystem can look at only the values it cares
277 * about. Basically, these are the attributes that the VFS layer can
278 * request to change from the FS layer.
280 * Derek Atkins <warlord@MIT.EDU> 94-10-20
283 unsigned int ia_valid
;
288 struct timespec ia_atime
;
289 struct timespec ia_mtime
;
290 struct timespec ia_ctime
;
293 * Not an attribute, but an auxilary info for filesystems wanting to
294 * implement an ftruncate() like method. NOTE: filesystem should
295 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
297 struct file
*ia_file
;
301 * Includes for diskquotas.
303 #include <linux/quota.h>
306 * enum positive_aop_returns - aop return codes with specific semantics
308 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
309 * completed, that the page is still locked, and
310 * should be considered active. The VM uses this hint
311 * to return the page to the active list -- it won't
312 * be a candidate for writeback again in the near
313 * future. Other callers must be careful to unlock
314 * the page if they get this return. Returned by
317 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
318 * unlocked it and the page might have been truncated.
319 * The caller should back up to acquiring a new page and
320 * trying again. The aop will be taking reasonable
321 * precautions not to livelock. If the caller held a page
322 * reference, it should drop it before retrying. Returned
323 * by readpage(), prepare_write(), and commit_write().
325 * address_space_operation functions return these large constants to indicate
326 * special semantics to the caller. These are much larger than the bytes in a
327 * page to allow for functions that return the number of bytes operated on in a
331 enum positive_aop_returns
{
332 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
333 AOP_TRUNCATED_PAGE
= 0x80001,
337 * oh the beauties of C type declarations.
340 struct address_space
;
341 struct writeback_control
;
343 struct address_space_operations
{
344 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
345 int (*readpage
)(struct file
*, struct page
*);
346 int (*sync_page
)(struct page
*);
348 /* Write back some dirty pages from this mapping. */
349 int (*writepages
)(struct address_space
*, struct writeback_control
*);
351 /* Set a page dirty */
352 int (*set_page_dirty
)(struct page
*page
);
354 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
355 struct list_head
*pages
, unsigned nr_pages
);
358 * ext3 requires that a successful prepare_write() call be followed
359 * by a commit_write() call - they must be balanced
361 int (*prepare_write
)(struct file
*, struct page
*, unsigned, unsigned);
362 int (*commit_write
)(struct file
*, struct page
*, unsigned, unsigned);
363 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
364 sector_t (*bmap
)(struct address_space
*, sector_t
);
365 int (*invalidatepage
) (struct page
*, unsigned long);
366 int (*releasepage
) (struct page
*, gfp_t
);
367 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
368 loff_t offset
, unsigned long nr_segs
);
369 struct page
* (*get_xip_page
)(struct address_space
*, sector_t
,
371 /* migrate the contents of a page to the specified target */
372 int (*migratepage
) (struct page
*, struct page
*);
375 struct backing_dev_info
;
376 struct address_space
{
377 struct inode
*host
; /* owner: inode, block_device */
378 struct radix_tree_root page_tree
; /* radix tree of all pages */
379 rwlock_t tree_lock
; /* and rwlock protecting it */
380 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
381 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
382 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
383 spinlock_t i_mmap_lock
; /* protect tree, count, list */
384 unsigned int truncate_count
; /* Cover race condition with truncate */
385 unsigned long nrpages
; /* number of total pages */
386 pgoff_t writeback_index
;/* writeback starts here */
387 struct address_space_operations
*a_ops
; /* methods */
388 unsigned long flags
; /* error bits/gfp mask */
389 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
390 spinlock_t private_lock
; /* for use by the address_space */
391 struct list_head private_list
; /* ditto */
392 struct address_space
*assoc_mapping
; /* ditto */
393 } __attribute__((aligned(sizeof(long))));
395 * On most architectures that alignment is already the case; but
396 * must be enforced here for CRIS, to let the least signficant bit
397 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
400 struct block_device
{
401 dev_t bd_dev
; /* not a kdev_t - it's a search key */
402 struct inode
* bd_inode
; /* will die */
404 struct mutex bd_mutex
; /* open/close mutex */
405 struct mutex bd_mount_mutex
; /* mount mutex */
406 struct list_head bd_inodes
;
409 struct block_device
* bd_contains
;
410 unsigned bd_block_size
;
411 struct hd_struct
* bd_part
;
412 /* number of times partitions within this device have been opened. */
413 unsigned bd_part_count
;
415 struct gendisk
* bd_disk
;
416 struct list_head bd_list
;
417 struct backing_dev_info
*bd_inode_backing_dev_info
;
419 * Private data. You must have bd_claim'ed the block_device
420 * to use this. NOTE: bd_claim allows an owner to claim
421 * the same device multiple times, the owner must take special
422 * care to not mess up bd_private for that case.
424 unsigned long bd_private
;
428 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
431 #define PAGECACHE_TAG_DIRTY 0
432 #define PAGECACHE_TAG_WRITEBACK 1
434 int mapping_tagged(struct address_space
*mapping
, int tag
);
437 * Might pages of this file be mapped into userspace?
439 static inline int mapping_mapped(struct address_space
*mapping
)
441 return !prio_tree_empty(&mapping
->i_mmap
) ||
442 !list_empty(&mapping
->i_mmap_nonlinear
);
446 * Might pages of this file have been modified in userspace?
447 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
448 * marks vma as VM_SHARED if it is shared, and the file was opened for
449 * writing i.e. vma may be mprotected writable even if now readonly.
451 static inline int mapping_writably_mapped(struct address_space
*mapping
)
453 return mapping
->i_mmap_writable
!= 0;
457 * Use sequence counter to get consistent i_size on 32-bit processors.
459 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
460 #include <linux/seqlock.h>
461 #define __NEED_I_SIZE_ORDERED
462 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
464 #define i_size_ordered_init(inode) do { } while (0)
468 struct hlist_node i_hash
;
469 struct list_head i_list
;
470 struct list_head i_sb_list
;
471 struct list_head i_dentry
;
475 unsigned int i_nlink
;
480 struct timespec i_atime
;
481 struct timespec i_mtime
;
482 struct timespec i_ctime
;
483 unsigned int i_blkbits
;
484 unsigned long i_blksize
;
485 unsigned long i_version
;
486 unsigned long i_blocks
;
487 unsigned short i_bytes
;
488 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
489 struct mutex i_mutex
;
490 struct rw_semaphore i_alloc_sem
;
491 struct inode_operations
*i_op
;
492 struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
493 struct super_block
*i_sb
;
494 struct file_lock
*i_flock
;
495 struct address_space
*i_mapping
;
496 struct address_space i_data
;
498 struct dquot
*i_dquot
[MAXQUOTAS
];
500 /* These three should probably be a union */
501 struct list_head i_devices
;
502 struct pipe_inode_info
*i_pipe
;
503 struct block_device
*i_bdev
;
509 #ifdef CONFIG_DNOTIFY
510 unsigned long i_dnotify_mask
; /* Directory notify events */
511 struct dnotify_struct
*i_dnotify
; /* for directory notifications */
514 #ifdef CONFIG_INOTIFY
515 struct list_head inotify_watches
; /* watches on this inode */
516 struct mutex inotify_mutex
; /* protects the watches list */
519 unsigned long i_state
;
520 unsigned long dirtied_when
; /* jiffies of first dirtying */
522 unsigned int i_flags
;
524 atomic_t i_writecount
;
529 #ifdef __NEED_I_SIZE_ORDERED
530 seqcount_t i_size_seqcount
;
535 * NOTE: in a 32bit arch with a preemptable kernel and
536 * an UP compile the i_size_read/write must be atomic
537 * with respect to the local cpu (unlike with preempt disabled),
538 * but they don't need to be atomic with respect to other cpus like in
539 * true SMP (so they need either to either locally disable irq around
540 * the read or for example on x86 they can be still implemented as a
541 * cmpxchg8b without the need of the lock prefix). For SMP compiles
542 * and 64bit archs it makes no difference if preempt is enabled or not.
544 static inline loff_t
i_size_read(struct inode
*inode
)
546 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
551 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
552 i_size
= inode
->i_size
;
553 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
555 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
559 i_size
= inode
->i_size
;
563 return inode
->i_size
;
568 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
570 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
571 write_seqcount_begin(&inode
->i_size_seqcount
);
572 inode
->i_size
= i_size
;
573 write_seqcount_end(&inode
->i_size_seqcount
);
574 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
576 inode
->i_size
= i_size
;
579 inode
->i_size
= i_size
;
583 static inline unsigned iminor(struct inode
*inode
)
585 return MINOR(inode
->i_rdev
);
588 static inline unsigned imajor(struct inode
*inode
)
590 return MAJOR(inode
->i_rdev
);
593 extern struct block_device
*I_BDEV(struct inode
*inode
);
596 rwlock_t lock
; /* protects pid, uid, euid fields */
597 int pid
; /* pid or -pgrp where SIGIO should be sent */
598 uid_t uid
, euid
; /* uid/euid of process setting the owner */
600 int signum
; /* posix.1b rt signal to be delivered on IO */
604 * Track a single file's readahead state
606 struct file_ra_state
{
607 unsigned long start
; /* Current window */
609 unsigned long flags
; /* ra flags RA_FLAG_xxx*/
610 unsigned long cache_hit
; /* cache hit count*/
611 unsigned long prev_page
; /* Cache last read() position */
612 unsigned long ahead_start
; /* Ahead window */
613 unsigned long ahead_size
;
614 unsigned long ra_pages
; /* Maximum readahead window */
615 unsigned long mmap_hit
; /* Cache hit stat for mmap accesses */
616 unsigned long mmap_miss
; /* Cache miss stat for mmap accesses */
618 #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
619 #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
623 * fu_list becomes invalid after file_free is called and queued via
624 * fu_rcuhead for RCU freeing
627 struct list_head fu_list
;
628 struct rcu_head fu_rcuhead
;
630 struct dentry
*f_dentry
;
631 struct vfsmount
*f_vfsmnt
;
632 struct file_operations
*f_op
;
634 unsigned int f_flags
;
637 struct fown_struct f_owner
;
638 unsigned int f_uid
, f_gid
;
639 struct file_ra_state f_ra
;
641 unsigned long f_version
;
644 /* needed for tty driver, and maybe others */
648 /* Used by fs/eventpoll.c to link all the hooks to this file */
649 struct list_head f_ep_links
;
650 spinlock_t f_ep_lock
;
651 #endif /* #ifdef CONFIG_EPOLL */
652 struct address_space
*f_mapping
;
654 extern spinlock_t files_lock
;
655 #define file_list_lock() spin_lock(&files_lock);
656 #define file_list_unlock() spin_unlock(&files_lock);
658 #define get_file(x) atomic_inc(&(x)->f_count)
659 #define file_count(x) atomic_read(&(x)->f_count)
661 #define MAX_NON_LFS ((1UL<<31) - 1)
663 /* Page cache limit. The filesystems should put that into their s_maxbytes
664 limits, otherwise bad things can happen in VM. */
665 #if BITS_PER_LONG==32
666 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
667 #elif BITS_PER_LONG==64
668 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
673 #define FL_ACCESS 8 /* not trying to lock, just looking */
674 #define FL_LOCKD 16 /* lock held by rpc.lockd */
675 #define FL_LEASE 32 /* lease held on this file */
676 #define FL_SLEEP 128 /* A blocking lock */
679 * The POSIX file lock owner is determined by
680 * the "struct files_struct" in the thread group
681 * (or NULL for no owner - BSD locks).
683 * Lockd stuffs a "host" pointer into this.
685 typedef struct files_struct
*fl_owner_t
;
687 struct file_lock_operations
{
688 void (*fl_insert
)(struct file_lock
*); /* lock insertion callback */
689 void (*fl_remove
)(struct file_lock
*); /* lock removal callback */
690 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
691 void (*fl_release_private
)(struct file_lock
*);
694 struct lock_manager_operations
{
695 int (*fl_compare_owner
)(struct file_lock
*, struct file_lock
*);
696 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
697 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
698 void (*fl_release_private
)(struct file_lock
*);
699 void (*fl_break
)(struct file_lock
*);
700 int (*fl_mylease
)(struct file_lock
*, struct file_lock
*);
701 int (*fl_change
)(struct file_lock
**, int);
704 /* that will die - we need it for nfs_lock_info */
705 #include <linux/nfs_fs_i.h>
708 struct file_lock
*fl_next
; /* singly linked list for this inode */
709 struct list_head fl_link
; /* doubly linked list of all locks */
710 struct list_head fl_block
; /* circular list of blocked processes */
713 wait_queue_head_t fl_wait
;
714 struct file
*fl_file
;
715 unsigned char fl_flags
;
716 unsigned char fl_type
;
720 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
721 unsigned long fl_break_time
; /* for nonblocking lease breaks */
723 struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
724 struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
726 struct nfs_lock_info nfs_fl
;
727 struct nfs4_lock_info nfs4_fl
;
731 /* The following constant reflects the upper bound of the file/locking space */
733 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
734 #define OFFSET_MAX INT_LIMIT(loff_t)
735 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
738 extern struct list_head file_lock_list
;
740 #include <linux/fcntl.h>
742 extern int fcntl_getlk(struct file
*, struct flock __user
*);
743 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
744 struct flock __user
*);
746 #if BITS_PER_LONG == 32
747 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
748 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
749 struct flock64 __user
*);
752 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
753 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
754 extern int fcntl_getlease(struct file
*filp
);
757 extern void locks_init_lock(struct file_lock
*);
758 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
759 extern void locks_remove_posix(struct file
*, fl_owner_t
);
760 extern void locks_remove_flock(struct file
*);
761 extern struct file_lock
*posix_test_lock(struct file
*, struct file_lock
*);
762 extern int posix_lock_file(struct file
*, struct file_lock
*);
763 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
764 extern void posix_block_lock(struct file_lock
*, struct file_lock
*);
765 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
766 extern int posix_locks_deadlock(struct file_lock
*, struct file_lock
*);
767 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
768 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
769 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
770 extern int setlease(struct file
*, long, struct file_lock
**);
771 extern int lease_modify(struct file_lock
**, int);
772 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
773 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
774 extern void steal_locks(fl_owner_t from
);
776 struct fasync_struct
{
779 struct fasync_struct
*fa_next
; /* singly linked list */
780 struct file
*fa_file
;
783 #define FASYNC_MAGIC 0x4601
785 /* SMP safe fasync helpers: */
786 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
787 /* can be called from interrupts */
788 extern void kill_fasync(struct fasync_struct
**, int, int);
789 /* only for net: no internal synchronization */
790 extern void __kill_fasync(struct fasync_struct
*, int, int);
792 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
793 extern void f_delown(struct file
*filp
);
794 extern int send_sigurg(struct fown_struct
*fown
);
800 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
801 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
802 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
804 extern struct list_head super_blocks
;
805 extern spinlock_t sb_lock
;
807 #define sb_entry(list) list_entry((list), struct super_block, s_list)
808 #define S_BIAS (1<<30)
810 struct list_head s_list
; /* Keep this first */
811 dev_t s_dev
; /* search index; _not_ kdev_t */
812 unsigned long s_blocksize
;
813 unsigned char s_blocksize_bits
;
814 unsigned char s_dirt
;
815 unsigned long long s_maxbytes
; /* Max file size */
816 struct file_system_type
*s_type
;
817 struct super_operations
*s_op
;
818 struct dquot_operations
*dq_op
;
819 struct quotactl_ops
*s_qcop
;
820 struct export_operations
*s_export_op
;
821 unsigned long s_flags
;
822 unsigned long s_magic
;
823 struct dentry
*s_root
;
824 struct rw_semaphore s_umount
;
831 struct xattr_handler
**s_xattr
;
833 struct list_head s_inodes
; /* all inodes */
834 struct list_head s_dirty
; /* dirty inodes */
835 struct list_head s_io
; /* parked for writeback */
836 struct hlist_head s_anon
; /* anonymous dentries for (nfs) exporting */
837 struct list_head s_files
;
839 struct block_device
*s_bdev
;
840 struct list_head s_instances
;
841 struct quota_info s_dquot
; /* Diskquota specific options */
844 wait_queue_head_t s_wait_unfrozen
;
846 char s_id
[32]; /* Informational name */
848 void *s_fs_info
; /* Filesystem private info */
851 * The next field is for VFS *only*. No filesystems have any business
852 * even looking at it. You had been warned.
854 struct mutex s_vfs_rename_mutex
; /* Kludge */
856 /* Granuality of c/m/atime in ns.
857 Cannot be worse than a second */
861 extern struct timespec
current_fs_time(struct super_block
*sb
);
864 * Snapshotting support.
872 #define vfs_check_frozen(sb, level) \
873 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
875 static inline void get_fs_excl(void)
877 atomic_inc(¤t
->fs_excl
);
880 static inline void put_fs_excl(void)
882 atomic_dec(¤t
->fs_excl
);
885 static inline int has_fs_excl(void)
887 return atomic_read(¤t
->fs_excl
);
892 * Superblock locking.
894 static inline void lock_super(struct super_block
* sb
)
897 mutex_lock(&sb
->s_lock
);
900 static inline void unlock_super(struct super_block
* sb
)
903 mutex_unlock(&sb
->s_lock
);
907 * VFS helper functions..
909 extern int vfs_permission(struct nameidata
*, int);
910 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
911 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
912 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
913 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *, int);
914 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
915 extern int vfs_rmdir(struct inode
*, struct dentry
*);
916 extern int vfs_unlink(struct inode
*, struct dentry
*);
917 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
920 * VFS dentry helper functions.
922 extern void dentry_unhash(struct dentry
*dentry
);
925 * VFS file helper functions.
927 extern int file_permission(struct file
*, int);
932 * NOTE! These match bits 12..15 of stat.st_mode
933 * (ie "(i_mode >> 12) & 15").
945 #define OSYNC_METADATA (1<<0)
946 #define OSYNC_DATA (1<<1)
947 #define OSYNC_INODE (1<<2)
948 int generic_osync_inode(struct inode
*, struct address_space
*, int);
951 * This is the "filldir" function type, used by readdir() to let
952 * the kernel specify what kind of dirent layout it wants to have.
953 * This allows the kernel to read directories into kernel space or
954 * to have different dirent layouts depending on the binary type.
956 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, ino_t
, unsigned);
958 struct block_device_operations
{
959 int (*open
) (struct inode
*, struct file
*);
960 int (*release
) (struct inode
*, struct file
*);
961 int (*ioctl
) (struct inode
*, struct file
*, unsigned, unsigned long);
962 long (*unlocked_ioctl
) (struct file
*, unsigned, unsigned long);
963 long (*compat_ioctl
) (struct file
*, unsigned, unsigned long);
964 int (*direct_access
) (struct block_device
*, sector_t
, unsigned long *);
965 int (*media_changed
) (struct gendisk
*);
966 int (*revalidate_disk
) (struct gendisk
*);
967 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
968 struct module
*owner
;
972 * "descriptor" for what we're up to with a read for sendfile().
973 * This allows us to use the same read code yet
974 * have multiple different users of the data that
975 * we read from a file.
977 * The simplest case just copies the data to user
990 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*, unsigned long, unsigned long);
992 /* These macros are for out of kernel modules to test that
993 * the kernel supports the unlocked_ioctl and compat_ioctl
994 * fields in struct file_operations. */
995 #define HAVE_COMPAT_IOCTL 1
996 #define HAVE_UNLOCKED_IOCTL 1
1000 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1001 * can be called without the big kernel lock held in all filesystems.
1003 struct file_operations
{
1004 struct module
*owner
;
1005 loff_t (*llseek
) (struct file
*, loff_t
, int);
1006 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1007 ssize_t (*aio_read
) (struct kiocb
*, char __user
*, size_t, loff_t
);
1008 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1009 ssize_t (*aio_write
) (struct kiocb
*, const char __user
*, size_t, loff_t
);
1010 int (*readdir
) (struct file
*, void *, filldir_t
);
1011 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1012 int (*ioctl
) (struct inode
*, struct file
*, unsigned int, unsigned long);
1013 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1014 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1015 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1016 int (*open
) (struct inode
*, struct file
*);
1017 int (*flush
) (struct file
*);
1018 int (*release
) (struct inode
*, struct file
*);
1019 int (*fsync
) (struct file
*, struct dentry
*, int datasync
);
1020 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1021 int (*fasync
) (int, struct file
*, int);
1022 int (*lock
) (struct file
*, int, struct file_lock
*);
1023 ssize_t (*readv
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
1024 ssize_t (*writev
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
1025 ssize_t (*sendfile
) (struct file
*, loff_t
*, size_t, read_actor_t
, void *);
1026 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1027 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1028 int (*check_flags
)(int);
1029 int (*dir_notify
)(struct file
*filp
, unsigned long arg
);
1030 int (*flock
) (struct file
*, int, struct file_lock
*);
1033 struct inode_operations
{
1034 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1035 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1036 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1037 int (*unlink
) (struct inode
*,struct dentry
*);
1038 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1039 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1040 int (*rmdir
) (struct inode
*,struct dentry
*);
1041 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1042 int (*rename
) (struct inode
*, struct dentry
*,
1043 struct inode
*, struct dentry
*);
1044 int (*readlink
) (struct dentry
*, char __user
*,int);
1045 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1046 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1047 void (*truncate
) (struct inode
*);
1048 int (*permission
) (struct inode
*, int, struct nameidata
*);
1049 int (*setattr
) (struct dentry
*, struct iattr
*);
1050 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1051 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1052 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1053 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1054 int (*removexattr
) (struct dentry
*, const char *);
1055 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1060 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1061 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1062 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1063 unsigned long, loff_t
*);
1064 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1065 unsigned long, loff_t
*);
1068 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1069 * without the big kernel lock held in all filesystems.
1071 struct super_operations
{
1072 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1073 void (*destroy_inode
)(struct inode
*);
1075 void (*read_inode
) (struct inode
*);
1077 void (*dirty_inode
) (struct inode
*);
1078 int (*write_inode
) (struct inode
*, int);
1079 void (*put_inode
) (struct inode
*);
1080 void (*drop_inode
) (struct inode
*);
1081 void (*delete_inode
) (struct inode
*);
1082 void (*put_super
) (struct super_block
*);
1083 void (*write_super
) (struct super_block
*);
1084 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1085 void (*write_super_lockfs
) (struct super_block
*);
1086 void (*unlockfs
) (struct super_block
*);
1087 int (*statfs
) (struct super_block
*, struct kstatfs
*);
1088 int (*remount_fs
) (struct super_block
*, int *, char *);
1089 void (*clear_inode
) (struct inode
*);
1090 void (*umount_begin
) (struct super_block
*);
1092 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1094 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1095 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1098 /* Inode state bits. Protected by inode_lock. */
1099 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1100 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1101 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1103 #define I_LOCK (1 << __I_LOCK)
1104 #define I_FREEING 16
1107 #define I_WILL_FREE 128
1109 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1111 extern void __mark_inode_dirty(struct inode
*, int);
1112 static inline void mark_inode_dirty(struct inode
*inode
)
1114 __mark_inode_dirty(inode
, I_DIRTY
);
1117 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1119 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1122 static inline void inode_inc_link_count(struct inode
*inode
)
1125 mark_inode_dirty(inode
);
1128 static inline void inode_dec_link_count(struct inode
*inode
)
1131 mark_inode_dirty(inode
);
1134 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1135 static inline void file_accessed(struct file
*file
)
1137 if (!(file
->f_flags
& O_NOATIME
))
1138 touch_atime(file
->f_vfsmnt
, file
->f_dentry
);
1141 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1144 * struct export_operations - for nfsd to communicate with file systems
1145 * @decode_fh: decode a file handle fragment and return a &struct dentry
1146 * @encode_fh: encode a file handle fragment from a dentry
1147 * @get_name: find the name for a given inode in a given directory
1148 * @get_parent: find the parent of a given directory
1149 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
1150 * @find_exported_dentry:
1151 * set by the exporting module to a standard helper function.
1154 * The export_operations structure provides a means for nfsd to communicate
1155 * with a particular exported file system - particularly enabling nfsd and
1156 * the filesystem to co-operate when dealing with file handles.
1158 * export_operations contains two basic operation for dealing with file
1159 * handles, decode_fh() and encode_fh(), and allows for some other
1160 * operations to be defined which standard helper routines use to get
1161 * specific information from the filesystem.
1163 * nfsd encodes information use to determine which filesystem a filehandle
1164 * applies to in the initial part of the file handle. The remainder, termed
1165 * a file handle fragment, is controlled completely by the filesystem. The
1166 * standard helper routines assume that this fragment will contain one or
1167 * two sub-fragments, one which identifies the file, and one which may be
1168 * used to identify the (a) directory containing the file.
1170 * In some situations, nfsd needs to get a dentry which is connected into a
1171 * specific part of the file tree. To allow for this, it passes the
1172 * function acceptable() together with a @context which can be used to see
1173 * if the dentry is acceptable. As there can be multiple dentrys for a
1174 * given file, the filesystem should check each one for acceptability before
1175 * looking for the next. As soon as an acceptable one is found, it should
1179 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1180 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1181 * @context). It should return a &struct dentry which refers to the same
1182 * file that the file handle fragment refers to, and which passes the
1183 * acceptability test. If it cannot, it should return a %NULL pointer if
1184 * the file was found but no acceptable &dentries were available, or a
1185 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1189 * @encode_fh should store in the file handle fragment @fh (using at most
1190 * @max_len bytes) information that can be used by @decode_fh to recover the
1191 * file refered to by the &struct dentry @de. If the @connectable flag is
1192 * set, the encode_fh() should store sufficient information so that a good
1193 * attempt can be made to find not only the file but also it's place in the
1194 * filesystem. This typically means storing a reference to de->d_parent in
1195 * the filehandle fragment. encode_fh() should return the number of bytes
1196 * stored or a negative error code such as %-ENOSPC
1199 * @get_name should find a name for the given @child in the given @parent
1200 * directory. The name should be stored in the @name (with the
1201 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1202 * buffer. get_name() should return %0 on success, a negative error code
1203 * or error. @get_name will be called without @parent->i_mutex held.
1206 * @get_parent should find the parent directory for the given @child which
1207 * is also a directory. In the event that it cannot be found, or storage
1208 * space cannot be allocated, a %ERR_PTR should be returned.
1211 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1212 * identifier, possibly an inode number, (@inump) get_dentry() should find
1213 * the identified inode and return a dentry for that inode. Any suitable
1214 * dentry can be returned including, if necessary, a new dentry created with
1215 * d_alloc_root. The caller can then find any other extant dentrys by
1216 * following the d_alias links. If a new dentry was created using
1217 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1218 * should be d_rehash()ed.
1220 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1221 * can be returned. The @inump will be whatever was passed to
1222 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
1225 * get_parent is called with child->d_inode->i_mutex down
1226 * get_name is not (which is possibly inconsistent)
1229 struct export_operations
{
1230 struct dentry
*(*decode_fh
)(struct super_block
*sb
, __u32
*fh
, int fh_len
, int fh_type
,
1231 int (*acceptable
)(void *context
, struct dentry
*de
),
1233 int (*encode_fh
)(struct dentry
*de
, __u32
*fh
, int *max_len
,
1236 /* the following are only called from the filesystem itself */
1237 int (*get_name
)(struct dentry
*parent
, char *name
,
1238 struct dentry
*child
);
1239 struct dentry
* (*get_parent
)(struct dentry
*child
);
1240 struct dentry
* (*get_dentry
)(struct super_block
*sb
, void *inump
);
1242 /* This is set by the exporting module to a standard helper */
1243 struct dentry
* (*find_exported_dentry
)(
1244 struct super_block
*sb
, void *obj
, void *parent
,
1245 int (*acceptable
)(void *context
, struct dentry
*de
),
1251 extern struct dentry
*
1252 find_exported_dentry(struct super_block
*sb
, void *obj
, void *parent
,
1253 int (*acceptable
)(void *context
, struct dentry
*de
),
1256 struct file_system_type
{
1259 struct super_block
*(*get_sb
) (struct file_system_type
*, int,
1260 const char *, void *);
1261 void (*kill_sb
) (struct super_block
*);
1262 struct module
*owner
;
1263 struct file_system_type
* next
;
1264 struct list_head fs_supers
;
1267 struct super_block
*get_sb_bdev(struct file_system_type
*fs_type
,
1268 int flags
, const char *dev_name
, void *data
,
1269 int (*fill_super
)(struct super_block
*, void *, int));
1270 struct super_block
*get_sb_single(struct file_system_type
*fs_type
,
1271 int flags
, void *data
,
1272 int (*fill_super
)(struct super_block
*, void *, int));
1273 struct super_block
*get_sb_nodev(struct file_system_type
*fs_type
,
1274 int flags
, void *data
,
1275 int (*fill_super
)(struct super_block
*, void *, int));
1276 void generic_shutdown_super(struct super_block
*sb
);
1277 void kill_block_super(struct super_block
*sb
);
1278 void kill_anon_super(struct super_block
*sb
);
1279 void kill_litter_super(struct super_block
*sb
);
1280 void deactivate_super(struct super_block
*sb
);
1281 int set_anon_super(struct super_block
*s
, void *data
);
1282 struct super_block
*sget(struct file_system_type
*type
,
1283 int (*test
)(struct super_block
*,void *),
1284 int (*set
)(struct super_block
*,void *),
1286 struct super_block
*get_sb_pseudo(struct file_system_type
*, char *,
1287 struct super_operations
*ops
, unsigned long);
1288 int __put_super(struct super_block
*sb
);
1289 int __put_super_and_need_restart(struct super_block
*sb
);
1290 void unnamed_dev_init(void);
1292 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1293 #define fops_get(fops) \
1294 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1295 #define fops_put(fops) \
1296 do { if (fops) module_put((fops)->owner); } while(0)
1298 extern int register_filesystem(struct file_system_type
*);
1299 extern int unregister_filesystem(struct file_system_type
*);
1300 extern struct vfsmount
*kern_mount(struct file_system_type
*);
1301 extern int may_umount_tree(struct vfsmount
*);
1302 extern int may_umount(struct vfsmount
*);
1303 extern void umount_tree(struct vfsmount
*, int, struct list_head
*);
1304 extern void release_mounts(struct list_head
*);
1305 extern long do_mount(char *, char *, char *, unsigned long, void *);
1306 extern struct vfsmount
*copy_tree(struct vfsmount
*, struct dentry
*, int);
1307 extern void mnt_set_mountpoint(struct vfsmount
*, struct dentry
*,
1310 extern int vfs_statfs(struct super_block
*, struct kstatfs
*);
1313 extern struct subsystem fs_subsys
;
1315 #define FLOCK_VERIFY_READ 1
1316 #define FLOCK_VERIFY_WRITE 2
1318 extern int locks_mandatory_locked(struct inode
*);
1319 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1322 * Candidates for mandatory locking have the setgid bit set
1323 * but no group execute bit - an otherwise meaningless combination.
1325 #define MANDATORY_LOCK(inode) \
1326 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1328 static inline int locks_verify_locked(struct inode
*inode
)
1330 if (MANDATORY_LOCK(inode
))
1331 return locks_mandatory_locked(inode
);
1335 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1337 static inline int locks_verify_truncate(struct inode
*inode
,
1341 if (inode
->i_flock
&& MANDATORY_LOCK(inode
))
1342 return locks_mandatory_area(
1343 FLOCK_VERIFY_WRITE
, inode
, filp
,
1344 size
< inode
->i_size
? size
: inode
->i_size
,
1345 (size
< inode
->i_size
? inode
->i_size
- size
1346 : size
- inode
->i_size
)
1351 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1354 return __break_lease(inode
, mode
);
1360 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
1362 extern long do_sys_open(int fdf
, const char __user
*filename
, int flags
,
1364 extern struct file
*filp_open(const char *, int, int);
1365 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int);
1366 extern int filp_close(struct file
*, fl_owner_t id
);
1367 extern char * getname(const char __user
*);
1370 extern void __init
vfs_caches_init_early(void);
1371 extern void __init
vfs_caches_init(unsigned long);
1373 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1374 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1375 #ifndef CONFIG_AUDITSYSCALL
1376 #define putname(name) __putname(name)
1378 extern void putname(const char *name
);
1381 extern int register_blkdev(unsigned int, const char *);
1382 extern int unregister_blkdev(unsigned int, const char *);
1383 extern struct block_device
*bdget(dev_t
);
1384 extern void bd_set_size(struct block_device
*, loff_t size
);
1385 extern void bd_forget(struct inode
*inode
);
1386 extern void bdput(struct block_device
*);
1387 extern struct block_device
*open_by_devnum(dev_t
, unsigned);
1388 extern struct file_operations def_blk_fops
;
1389 extern struct address_space_operations def_blk_aops
;
1390 extern struct file_operations def_chr_fops
;
1391 extern struct file_operations bad_sock_fops
;
1392 extern struct file_operations def_fifo_fops
;
1393 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
1394 extern int blkdev_ioctl(struct inode
*, struct file
*, unsigned, unsigned long);
1395 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
1396 extern int blkdev_get(struct block_device
*, mode_t
, unsigned);
1397 extern int blkdev_put(struct block_device
*);
1398 extern int bd_claim(struct block_device
*, void *);
1399 extern void bd_release(struct block_device
*);
1402 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
1403 extern int register_chrdev_region(dev_t
, unsigned, const char *);
1404 extern int register_chrdev(unsigned int, const char *,
1405 struct file_operations
*);
1406 extern int unregister_chrdev(unsigned int, const char *);
1407 extern void unregister_chrdev_region(dev_t
, unsigned);
1408 extern int chrdev_open(struct inode
*, struct file
*);
1409 extern int get_chrdev_list(char *);
1410 extern void *acquire_chrdev_list(void);
1411 extern int count_chrdev_list(void);
1412 extern void *get_next_chrdev(void *);
1413 extern int get_chrdev_info(void *, int *, char **);
1414 extern void release_chrdev_list(void *);
1416 /* fs/block_dev.c */
1417 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1418 extern const char *__bdevname(dev_t
, char *buffer
);
1419 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
1420 extern struct block_device
*lookup_bdev(const char *);
1421 extern struct block_device
*open_bdev_excl(const char *, int, void *);
1422 extern void close_bdev_excl(struct block_device
*);
1423 extern void *acquire_blkdev_list(void);
1424 extern int count_blkdev_list(void);
1425 extern void *get_next_blkdev(void *);
1426 extern int get_blkdev_info(void *, int *, char **);
1427 extern void release_blkdev_list(void *);
1429 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
1431 /* Invalid inode operations -- fs/bad_inode.c */
1432 extern void make_bad_inode(struct inode
*);
1433 extern int is_bad_inode(struct inode
*);
1435 extern struct file_operations read_fifo_fops
;
1436 extern struct file_operations write_fifo_fops
;
1437 extern struct file_operations rdwr_fifo_fops
;
1439 extern int fs_may_remount_ro(struct super_block
*);
1442 * return READ, READA, or WRITE
1444 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1447 * return data direction, READ or WRITE
1449 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1451 extern int check_disk_change(struct block_device
*);
1452 extern int invalidate_inodes(struct super_block
*);
1453 extern int __invalidate_device(struct block_device
*);
1454 extern int invalidate_partition(struct gendisk
*, int);
1455 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
1456 pgoff_t start
, pgoff_t end
);
1457 unsigned long invalidate_inode_pages(struct address_space
*mapping
);
1458 static inline void invalidate_remote_inode(struct inode
*inode
)
1460 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
1461 S_ISLNK(inode
->i_mode
))
1462 invalidate_inode_pages(inode
->i_mapping
);
1464 extern int invalidate_inode_pages2(struct address_space
*mapping
);
1465 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
1466 pgoff_t start
, pgoff_t end
);
1467 extern int write_inode_now(struct inode
*, int);
1468 extern int filemap_fdatawrite(struct address_space
*);
1469 extern int filemap_flush(struct address_space
*);
1470 extern int filemap_fdatawait(struct address_space
*);
1471 extern int filemap_write_and_wait(struct address_space
*mapping
);
1472 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
1473 loff_t lstart
, loff_t lend
);
1474 extern void sync_supers(void);
1475 extern void sync_filesystems(int wait
);
1476 extern void emergency_sync(void);
1477 extern void emergency_remount(void);
1478 extern int do_remount_sb(struct super_block
*sb
, int flags
,
1479 void *data
, int force
);
1480 extern sector_t
bmap(struct inode
*, sector_t
);
1481 extern int notify_change(struct dentry
*, struct iattr
*);
1482 extern int permission(struct inode
*, int, struct nameidata
*);
1483 extern int generic_permission(struct inode
*, int,
1484 int (*check_acl
)(struct inode
*, int));
1486 extern int get_write_access(struct inode
*);
1487 extern int deny_write_access(struct file
*);
1488 static inline void put_write_access(struct inode
* inode
)
1490 atomic_dec(&inode
->i_writecount
);
1492 static inline void allow_write_access(struct file
*file
)
1495 atomic_inc(&file
->f_dentry
->d_inode
->i_writecount
);
1497 extern int do_pipe(int *);
1499 extern int open_namei(int dfd
, const char *, int, int, struct nameidata
*);
1500 extern int may_open(struct nameidata
*, int, int);
1502 extern int kernel_read(struct file
*, unsigned long, char *, unsigned long);
1503 extern struct file
* open_exec(const char *);
1505 /* fs/dcache.c -- generic fs support functions */
1506 extern int is_subdir(struct dentry
*, struct dentry
*);
1507 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
1509 #include <linux/err.h>
1511 /* needed for stackable file system support */
1512 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
1514 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
1516 extern void inode_init_once(struct inode
*);
1517 extern void iput(struct inode
*);
1518 extern struct inode
* igrab(struct inode
*);
1519 extern ino_t
iunique(struct super_block
*, ino_t
);
1520 extern int inode_needs_sync(struct inode
*inode
);
1521 extern void generic_delete_inode(struct inode
*inode
);
1522 extern void generic_drop_inode(struct inode
*inode
);
1524 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
1525 unsigned long hashval
, int (*test
)(struct inode
*, void *),
1527 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
1528 int (*test
)(struct inode
*, void *), void *data
);
1529 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
1531 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
1532 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
1533 extern void unlock_new_inode(struct inode
*);
1535 static inline struct inode
*iget(struct super_block
*sb
, unsigned long ino
)
1537 struct inode
*inode
= iget_locked(sb
, ino
);
1539 if (inode
&& (inode
->i_state
& I_NEW
)) {
1540 sb
->s_op
->read_inode(inode
);
1541 unlock_new_inode(inode
);
1547 extern void __iget(struct inode
* inode
);
1548 extern void clear_inode(struct inode
*);
1549 extern void destroy_inode(struct inode
*);
1550 extern struct inode
*new_inode(struct super_block
*);
1551 extern int remove_suid(struct dentry
*);
1552 extern void remove_dquot_ref(struct super_block
*, int, struct list_head
*);
1553 extern struct mutex iprune_mutex
;
1555 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
1556 extern void remove_inode_hash(struct inode
*);
1557 static inline void insert_inode_hash(struct inode
*inode
) {
1558 __insert_inode_hash(inode
, inode
->i_ino
);
1561 extern struct file
* get_empty_filp(void);
1562 extern void file_move(struct file
*f
, struct list_head
*list
);
1563 extern void file_kill(struct file
*f
);
1565 extern void submit_bio(int, struct bio
*);
1566 extern int bdev_read_only(struct block_device
*);
1567 extern int set_blocksize(struct block_device
*, int);
1568 extern int sb_set_blocksize(struct super_block
*, int);
1569 extern int sb_min_blocksize(struct super_block
*, int);
1571 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
1572 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
1573 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
1574 extern int file_send_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
1575 extern ssize_t
generic_file_read(struct file
*, char __user
*, size_t, loff_t
*);
1576 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
1577 extern ssize_t
generic_file_write(struct file
*, const char __user
*, size_t, loff_t
*);
1578 extern ssize_t
generic_file_aio_read(struct kiocb
*, char __user
*, size_t, loff_t
);
1579 extern ssize_t
__generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
*);
1580 extern ssize_t
generic_file_aio_write(struct kiocb
*, const char __user
*, size_t, loff_t
);
1581 extern ssize_t
generic_file_aio_write_nolock(struct kiocb
*, const struct iovec
*,
1582 unsigned long, loff_t
*);
1583 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
1584 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
1585 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
1586 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
1587 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
1588 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
1589 ssize_t
generic_file_write_nolock(struct file
*file
, const struct iovec
*iov
,
1590 unsigned long nr_segs
, loff_t
*ppos
);
1591 extern ssize_t
generic_file_sendfile(struct file
*, loff_t
*, size_t, read_actor_t
, void *);
1592 extern void do_generic_mapping_read(struct address_space
*mapping
,
1593 struct file_ra_state
*, struct file
*,
1594 loff_t
*, read_descriptor_t
*, read_actor_t
);
1596 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
1597 extern ssize_t
generic_file_readv(struct file
*filp
, const struct iovec
*iov
,
1598 unsigned long nr_segs
, loff_t
*ppos
);
1599 ssize_t
generic_file_writev(struct file
*filp
, const struct iovec
*iov
,
1600 unsigned long nr_segs
, loff_t
*ppos
);
1601 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
1602 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
1603 extern loff_t
remote_llseek(struct file
*file
, loff_t offset
, int origin
);
1604 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
1605 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
1607 #ifdef CONFIG_FS_XIP
1608 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
1610 extern ssize_t
xip_file_sendfile(struct file
*in_file
, loff_t
*ppos
,
1611 size_t count
, read_actor_t actor
,
1613 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
1614 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
1615 size_t len
, loff_t
*ppos
);
1616 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
1618 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
1624 static inline void do_generic_file_read(struct file
* filp
, loff_t
*ppos
,
1625 read_descriptor_t
* desc
,
1628 do_generic_mapping_read(filp
->f_mapping
,
1636 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
1637 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
1638 unsigned long nr_segs
, get_blocks_t get_blocks
, dio_iodone_t end_io
,
1642 DIO_LOCKING
= 1, /* need locking between buffered and direct access */
1643 DIO_NO_LOCKING
, /* bdev; no locking at all between buffered/direct */
1644 DIO_OWN_LOCKING
, /* filesystem locks buffered and direct internally */
1647 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
1648 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1649 loff_t offset
, unsigned long nr_segs
, get_blocks_t get_blocks
,
1650 dio_iodone_t end_io
)
1652 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1653 nr_segs
, get_blocks
, end_io
, DIO_LOCKING
);
1656 static inline ssize_t
blockdev_direct_IO_no_locking(int rw
, struct kiocb
*iocb
,
1657 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1658 loff_t offset
, unsigned long nr_segs
, get_blocks_t get_blocks
,
1659 dio_iodone_t end_io
)
1661 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1662 nr_segs
, get_blocks
, end_io
, DIO_NO_LOCKING
);
1665 static inline ssize_t
blockdev_direct_IO_own_locking(int rw
, struct kiocb
*iocb
,
1666 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1667 loff_t offset
, unsigned long nr_segs
, get_blocks_t get_blocks
,
1668 dio_iodone_t end_io
)
1670 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1671 nr_segs
, get_blocks
, end_io
, DIO_OWN_LOCKING
);
1674 extern struct file_operations generic_ro_fops
;
1676 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1678 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
1679 extern int vfs_follow_link(struct nameidata
*, const char *);
1680 extern int page_readlink(struct dentry
*, char __user
*, int);
1681 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
1682 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
1683 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
1685 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
1686 extern struct inode_operations page_symlink_inode_operations
;
1687 extern int generic_readlink(struct dentry
*, char __user
*, int);
1688 extern void generic_fillattr(struct inode
*, struct kstat
*);
1689 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
1690 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
1691 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
1692 loff_t
inode_get_bytes(struct inode
*inode
);
1693 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
1695 extern int vfs_readdir(struct file
*, filldir_t
, void *);
1697 extern int vfs_stat(char __user
*, struct kstat
*);
1698 extern int vfs_lstat(char __user
*, struct kstat
*);
1699 extern int vfs_stat_fd(int dfd
, char __user
*, struct kstat
*);
1700 extern int vfs_lstat_fd(int dfd
, char __user
*, struct kstat
*);
1701 extern int vfs_fstat(unsigned int, struct kstat
*);
1703 extern int vfs_ioctl(struct file
*, unsigned int, unsigned int, unsigned long);
1705 extern struct file_system_type
*get_fs_type(const char *name
);
1706 extern struct super_block
*get_super(struct block_device
*);
1707 extern struct super_block
*user_get_super(dev_t
);
1708 extern void drop_super(struct super_block
*sb
);
1710 extern int dcache_dir_open(struct inode
*, struct file
*);
1711 extern int dcache_dir_close(struct inode
*, struct file
*);
1712 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
1713 extern int dcache_readdir(struct file
*, void *, filldir_t
);
1714 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
1715 extern int simple_statfs(struct super_block
*, struct kstatfs
*);
1716 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
1717 extern int simple_unlink(struct inode
*, struct dentry
*);
1718 extern int simple_rmdir(struct inode
*, struct dentry
*);
1719 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1720 extern int simple_sync_file(struct file
*, struct dentry
*, int);
1721 extern int simple_empty(struct dentry
*);
1722 extern int simple_readpage(struct file
*file
, struct page
*page
);
1723 extern int simple_prepare_write(struct file
*file
, struct page
*page
,
1724 unsigned offset
, unsigned to
);
1725 extern int simple_commit_write(struct file
*file
, struct page
*page
,
1726 unsigned offset
, unsigned to
);
1728 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
1729 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
1730 extern struct file_operations simple_dir_operations
;
1731 extern struct inode_operations simple_dir_inode_operations
;
1732 struct tree_descr
{ char *name
; struct file_operations
*ops
; int mode
; };
1733 struct dentry
*d_alloc_name(struct dentry
*, const char *);
1734 extern int simple_fill_super(struct super_block
*, int, struct tree_descr
*);
1735 extern int simple_pin_fs(char *name
, struct vfsmount
**mount
, int *count
);
1736 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
1738 extern ssize_t
simple_read_from_buffer(void __user
*, size_t, loff_t
*, const void *, size_t);
1740 #ifdef CONFIG_MIGRATION
1741 extern int buffer_migrate_page(struct page
*, struct page
*);
1743 #define buffer_migrate_page NULL
1746 extern int inode_change_ok(struct inode
*, struct iattr
*);
1747 extern int __must_check
inode_setattr(struct inode
*, struct iattr
*);
1749 extern void file_update_time(struct file
*file
);
1751 static inline ino_t
parent_ino(struct dentry
*dentry
)
1755 spin_lock(&dentry
->d_lock
);
1756 res
= dentry
->d_parent
->d_inode
->i_ino
;
1757 spin_unlock(&dentry
->d_lock
);
1762 extern int unshare_files(void);
1764 /* Transaction based IO helpers */
1767 * An argresp is stored in an allocated page and holds the
1768 * size of the argument or response, along with its content
1770 struct simple_transaction_argresp
{
1775 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1777 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
1779 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
1780 size_t size
, loff_t
*pos
);
1781 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
1783 static inline void simple_transaction_set(struct file
*file
, size_t n
)
1785 struct simple_transaction_argresp
*ar
= file
->private_data
;
1787 BUG_ON(n
> SIMPLE_TRANSACTION_LIMIT
);
1790 * The barrier ensures that ar->size will really remain zero until
1791 * ar->data is ready for reading.
1798 * simple attribute files
1800 * These attributes behave similar to those in sysfs:
1802 * Writing to an attribute immediately sets a value, an open file can be
1803 * written to multiple times.
1805 * Reading from an attribute creates a buffer from the value that might get
1806 * read with multiple read calls. When the attribute has been read
1807 * completely, no further read calls are possible until the file is opened
1810 * All attributes contain a text representation of a numeric value
1811 * that are accessed with the get() and set() functions.
1813 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1814 static int __fops ## _open(struct inode *inode, struct file *file) \
1816 __simple_attr_check_format(__fmt, 0ull); \
1817 return simple_attr_open(inode, file, __get, __set, __fmt); \
1819 static struct file_operations __fops = { \
1820 .owner = THIS_MODULE, \
1821 .open = __fops ## _open, \
1822 .release = simple_attr_close, \
1823 .read = simple_attr_read, \
1824 .write = simple_attr_write, \
1827 static inline void __attribute__((format(printf
, 1, 2)))
1828 __simple_attr_check_format(const char *fmt
, ...)
1830 /* don't do anything, just let the compiler check the arguments; */
1833 int simple_attr_open(struct inode
*inode
, struct file
*file
,
1834 u64 (*get
)(void *), void (*set
)(void *, u64
),
1836 int simple_attr_close(struct inode
*inode
, struct file
*file
);
1837 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
1838 size_t len
, loff_t
*ppos
);
1839 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
1840 size_t len
, loff_t
*ppos
);
1843 #ifdef CONFIG_SECURITY
1844 static inline char *alloc_secdata(void)
1846 return (char *)get_zeroed_page(GFP_KERNEL
);
1849 static inline void free_secdata(void *secdata
)
1851 free_page((unsigned long)secdata
);
1854 static inline char *alloc_secdata(void)
1859 static inline void free_secdata(void *secdata
)
1861 #endif /* CONFIG_SECURITY */
1863 #endif /* __KERNEL__ */
1864 #endif /* _LINUX_FS_H */