5 * This file has definitions for some important file table
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
13 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
14 * the file limit at runtime and only root can increase the per-process
15 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
16 * upper limit on files-per-process.
18 * Some programs (notably those using select()) may have to be
19 * recompiled to take full advantage of the new limits..
22 /* Fixed constants first: */
24 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
25 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
27 #define BLOCK_SIZE_BITS 10
28 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
30 #define SEEK_SET 0 /* seek relative to beginning of file */
31 #define SEEK_CUR 1 /* seek relative to current file position */
32 #define SEEK_END 2 /* seek relative to end of file */
34 /* And dynamically-tunable limits and defaults: */
35 struct files_stat_struct
{
36 int nr_files
; /* read only */
37 int nr_free_files
; /* read only */
38 int max_files
; /* tunable */
40 extern struct files_stat_struct files_stat
;
41 extern int get_max_files(void);
43 struct inodes_stat_t
{
48 extern struct inodes_stat_t inodes_stat
;
50 extern int leases_enable
, lease_break_time
;
53 extern int dir_notify_enable
;
56 #define NR_FILE 8192 /* this can well be larger on a larger system */
66 /* Internal kernel extensions */
69 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
71 /* File is being opened for execution. Primary users of this flag are
72 distributed filesystems that can use it to achieve correct ETXTBUSY
73 behavior for cross-node execution/opening_for_writing of files */
80 #define READA 2 /* read-ahead - don't block if no resources */
81 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
82 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
83 #define READ_META (READ | (1 << BIO_RW_META))
84 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
85 #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
91 /* public flags for file_system_type */
92 #define FS_REQUIRES_DEV 1
93 #define FS_BINARY_MOUNTDATA 2
94 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
95 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
96 * during rename() internally.
100 * These are the fs-independent mount-flags: up to 32 flags are supported
102 #define MS_RDONLY 1 /* Mount read-only */
103 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
104 #define MS_NODEV 4 /* Disallow access to device special files */
105 #define MS_NOEXEC 8 /* Disallow program execution */
106 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
107 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
108 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
109 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
110 #define MS_NOATIME 1024 /* Do not update access times. */
111 #define MS_NODIRATIME 2048 /* Do not update directory access times */
115 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
116 MS_VERBOSE is deprecated. */
117 #define MS_SILENT 32768
118 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
119 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
120 #define MS_PRIVATE (1<<18) /* change to private */
121 #define MS_SLAVE (1<<19) /* change to slave */
122 #define MS_SHARED (1<<20) /* change to shared */
123 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
124 #define MS_ACTIVE (1<<30)
125 #define MS_NOUSER (1<<31)
128 * Superblock flags that can be altered by MS_REMOUNT
130 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
133 * Old magic mount flag and mask
135 #define MS_MGC_VAL 0xC0ED0000
136 #define MS_MGC_MSK 0xffff0000
138 /* Inode flags - they have nothing to superblock flags now */
140 #define S_SYNC 1 /* Writes are synced at once */
141 #define S_NOATIME 2 /* Do not update access times */
142 #define S_APPEND 4 /* Append-only file */
143 #define S_IMMUTABLE 8 /* Immutable file */
144 #define S_DEAD 16 /* removed, but still open directory */
145 #define S_NOQUOTA 32 /* Inode is not counted to quota */
146 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
147 #define S_NOCMTIME 128 /* Do not update file c/mtime */
148 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
149 #define S_PRIVATE 512 /* Inode is fs-internal */
152 * Note that nosuid etc flags are inode-specific: setting some file-system
153 * flags just means all the inodes inherit those flags by default. It might be
154 * possible to override it selectively if you really wanted to with some
155 * ioctl() that is not currently implemented.
157 * Exception: MS_RDONLY is always applied to the entire file system.
159 * Unfortunately, it is possible to change a filesystems flags with it mounted
160 * with files in use. This means that all of the inodes will not have their
161 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
162 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
164 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
166 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
167 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
168 ((inode)->i_flags & S_SYNC))
169 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
170 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
171 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
172 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
174 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
175 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
176 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
177 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
179 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
180 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
181 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
182 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
184 /* the read-only stuff doesn't really belong here, but any other place is
185 probably as bad and I don't want to create yet another include file. */
187 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
188 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
189 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
190 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
191 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
192 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
193 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
194 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
195 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
196 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
197 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
198 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
200 #define BLKPG _IO(0x12,105)/* See blkpg.h */
202 /* Some people are morons. Do not use sizeof! */
204 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
205 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
206 /* This was here just to show that the number is taken -
207 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
209 /* A jump here: 108-111 have been used for various private purposes. */
210 #define BLKBSZGET _IOR(0x12,112,size_t)
211 #define BLKBSZSET _IOW(0x12,113,size_t)
212 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
213 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
214 #define BLKTRACESTART _IO(0x12,116)
215 #define BLKTRACESTOP _IO(0x12,117)
216 #define BLKTRACETEARDOWN _IO(0x12,118)
218 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
219 #define FIBMAP _IO(0x00,1) /* bmap access */
220 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
222 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
223 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
224 #define FS_IOC_GETVERSION _IOR('v', 1, long)
225 #define FS_IOC_SETVERSION _IOW('v', 2, long)
226 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
227 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
228 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
229 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
232 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
234 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
235 #define FS_UNRM_FL 0x00000002 /* Undelete */
236 #define FS_COMPR_FL 0x00000004 /* Compress file */
237 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
238 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
239 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
240 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
241 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
242 /* Reserved for compression usage... */
243 #define FS_DIRTY_FL 0x00000100
244 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
245 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
246 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
247 /* End compression flags --- maybe not all used */
248 #define FS_BTREE_FL 0x00001000 /* btree format dir */
249 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
250 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
251 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
252 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
253 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
254 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
255 #define FS_EXTENT_FL 0x00080000 /* Extents */
256 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
257 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
259 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
260 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
263 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
264 #define SYNC_FILE_RANGE_WRITE 2
265 #define SYNC_FILE_RANGE_WAIT_AFTER 4
269 #include <linux/linkage.h>
270 #include <linux/wait.h>
271 #include <linux/types.h>
272 #include <linux/kdev_t.h>
273 #include <linux/dcache.h>
274 #include <linux/namei.h>
275 #include <linux/stat.h>
276 #include <linux/cache.h>
277 #include <linux/kobject.h>
278 #include <linux/list.h>
279 #include <linux/radix-tree.h>
280 #include <linux/prio_tree.h>
281 #include <linux/init.h>
282 #include <linux/pid.h>
283 #include <linux/mutex.h>
285 #include <asm/atomic.h>
286 #include <asm/semaphore.h>
287 #include <asm/byteorder.h>
293 struct pipe_inode_info
;
294 struct poll_table_struct
;
296 struct vm_area_struct
;
299 extern void __init
inode_init(unsigned long);
300 extern void __init
inode_init_early(void);
301 extern void __init
mnt_init(unsigned long);
302 extern void __init
files_init(unsigned long);
305 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
306 struct buffer_head
*bh_result
, int create
);
307 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
308 ssize_t bytes
, void *private);
311 * Attribute flags. These should be or-ed together to figure out what
318 #define ATTR_ATIME 16
319 #define ATTR_MTIME 32
320 #define ATTR_CTIME 64
321 #define ATTR_ATIME_SET 128
322 #define ATTR_MTIME_SET 256
323 #define ATTR_FORCE 512 /* Not a change, but a change it */
324 #define ATTR_ATTR_FLAG 1024
325 #define ATTR_KILL_SUID 2048
326 #define ATTR_KILL_SGID 4096
327 #define ATTR_FILE 8192
330 * This is the Inode Attributes structure, used for notify_change(). It
331 * uses the above definitions as flags, to know which values have changed.
332 * Also, in this manner, a Filesystem can look at only the values it cares
333 * about. Basically, these are the attributes that the VFS layer can
334 * request to change from the FS layer.
336 * Derek Atkins <warlord@MIT.EDU> 94-10-20
339 unsigned int ia_valid
;
344 struct timespec ia_atime
;
345 struct timespec ia_mtime
;
346 struct timespec ia_ctime
;
349 * Not an attribute, but an auxilary info for filesystems wanting to
350 * implement an ftruncate() like method. NOTE: filesystem should
351 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
353 struct file
*ia_file
;
357 * Includes for diskquotas.
359 #include <linux/quota.h>
362 * enum positive_aop_returns - aop return codes with specific semantics
364 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
365 * completed, that the page is still locked, and
366 * should be considered active. The VM uses this hint
367 * to return the page to the active list -- it won't
368 * be a candidate for writeback again in the near
369 * future. Other callers must be careful to unlock
370 * the page if they get this return. Returned by
373 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
374 * unlocked it and the page might have been truncated.
375 * The caller should back up to acquiring a new page and
376 * trying again. The aop will be taking reasonable
377 * precautions not to livelock. If the caller held a page
378 * reference, it should drop it before retrying. Returned
379 * by readpage(), prepare_write(), and commit_write().
381 * address_space_operation functions return these large constants to indicate
382 * special semantics to the caller. These are much larger than the bytes in a
383 * page to allow for functions that return the number of bytes operated on in a
387 enum positive_aop_returns
{
388 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
389 AOP_TRUNCATED_PAGE
= 0x80001,
393 * oh the beauties of C type declarations.
396 struct address_space
;
397 struct writeback_control
;
399 struct address_space_operations
{
400 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
401 int (*readpage
)(struct file
*, struct page
*);
402 void (*sync_page
)(struct page
*);
404 /* Write back some dirty pages from this mapping. */
405 int (*writepages
)(struct address_space
*, struct writeback_control
*);
407 /* Set a page dirty. Return true if this dirtied it */
408 int (*set_page_dirty
)(struct page
*page
);
410 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
411 struct list_head
*pages
, unsigned nr_pages
);
414 * ext3 requires that a successful prepare_write() call be followed
415 * by a commit_write() call - they must be balanced
417 int (*prepare_write
)(struct file
*, struct page
*, unsigned, unsigned);
418 int (*commit_write
)(struct file
*, struct page
*, unsigned, unsigned);
419 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
420 sector_t (*bmap
)(struct address_space
*, sector_t
);
421 void (*invalidatepage
) (struct page
*, unsigned long);
422 int (*releasepage
) (struct page
*, gfp_t
);
423 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
424 loff_t offset
, unsigned long nr_segs
);
425 struct page
* (*get_xip_page
)(struct address_space
*, sector_t
,
427 /* migrate the contents of a page to the specified target */
428 int (*migratepage
) (struct address_space
*,
429 struct page
*, struct page
*);
430 int (*launder_page
) (struct page
*);
433 struct backing_dev_info
;
434 struct address_space
{
435 struct inode
*host
; /* owner: inode, block_device */
436 struct radix_tree_root page_tree
; /* radix tree of all pages */
437 rwlock_t tree_lock
; /* and rwlock protecting it */
438 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
439 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
440 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
441 spinlock_t i_mmap_lock
; /* protect tree, count, list */
442 unsigned int truncate_count
; /* Cover race condition with truncate */
443 unsigned long nrpages
; /* number of total pages */
444 pgoff_t writeback_index
;/* writeback starts here */
445 const struct address_space_operations
*a_ops
; /* methods */
446 unsigned long flags
; /* error bits/gfp mask */
447 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
448 spinlock_t private_lock
; /* for use by the address_space */
449 struct list_head private_list
; /* ditto */
450 struct address_space
*assoc_mapping
; /* ditto */
451 } __attribute__((aligned(sizeof(long))));
453 * On most architectures that alignment is already the case; but
454 * must be enforced here for CRIS, to let the least signficant bit
455 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
458 struct block_device
{
459 dev_t bd_dev
; /* not a kdev_t - it's a search key */
460 struct inode
* bd_inode
; /* will die */
462 struct mutex bd_mutex
; /* open/close mutex */
463 struct semaphore bd_mount_sem
;
464 struct list_head bd_inodes
;
468 struct list_head bd_holder_list
;
470 struct block_device
* bd_contains
;
471 unsigned bd_block_size
;
472 struct hd_struct
* bd_part
;
473 /* number of times partitions within this device have been opened. */
474 unsigned bd_part_count
;
476 struct gendisk
* bd_disk
;
477 struct list_head bd_list
;
478 struct backing_dev_info
*bd_inode_backing_dev_info
;
480 * Private data. You must have bd_claim'ed the block_device
481 * to use this. NOTE: bd_claim allows an owner to claim
482 * the same device multiple times, the owner must take special
483 * care to not mess up bd_private for that case.
485 unsigned long bd_private
;
489 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
492 #define PAGECACHE_TAG_DIRTY 0
493 #define PAGECACHE_TAG_WRITEBACK 1
495 int mapping_tagged(struct address_space
*mapping
, int tag
);
498 * Might pages of this file be mapped into userspace?
500 static inline int mapping_mapped(struct address_space
*mapping
)
502 return !prio_tree_empty(&mapping
->i_mmap
) ||
503 !list_empty(&mapping
->i_mmap_nonlinear
);
507 * Might pages of this file have been modified in userspace?
508 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
509 * marks vma as VM_SHARED if it is shared, and the file was opened for
510 * writing i.e. vma may be mprotected writable even if now readonly.
512 static inline int mapping_writably_mapped(struct address_space
*mapping
)
514 return mapping
->i_mmap_writable
!= 0;
518 * Use sequence counter to get consistent i_size on 32-bit processors.
520 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
521 #include <linux/seqlock.h>
522 #define __NEED_I_SIZE_ORDERED
523 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
525 #define i_size_ordered_init(inode) do { } while (0)
529 struct hlist_node i_hash
;
530 struct list_head i_list
;
531 struct list_head i_sb_list
;
532 struct list_head i_dentry
;
535 unsigned int i_nlink
;
539 unsigned long i_version
;
541 #ifdef __NEED_I_SIZE_ORDERED
542 seqcount_t i_size_seqcount
;
544 struct timespec i_atime
;
545 struct timespec i_mtime
;
546 struct timespec i_ctime
;
547 unsigned int i_blkbits
;
549 unsigned short i_bytes
;
551 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
552 struct mutex i_mutex
;
553 struct rw_semaphore i_alloc_sem
;
554 const struct inode_operations
*i_op
;
555 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
556 struct super_block
*i_sb
;
557 struct file_lock
*i_flock
;
558 struct address_space
*i_mapping
;
559 struct address_space i_data
;
561 struct dquot
*i_dquot
[MAXQUOTAS
];
563 struct list_head i_devices
;
565 struct pipe_inode_info
*i_pipe
;
566 struct block_device
*i_bdev
;
573 #ifdef CONFIG_DNOTIFY
574 unsigned long i_dnotify_mask
; /* Directory notify events */
575 struct dnotify_struct
*i_dnotify
; /* for directory notifications */
578 #ifdef CONFIG_INOTIFY
579 struct list_head inotify_watches
; /* watches on this inode */
580 struct mutex inotify_mutex
; /* protects the watches list */
583 unsigned long i_state
;
584 unsigned long dirtied_when
; /* jiffies of first dirtying */
586 unsigned int i_flags
;
588 atomic_t i_writecount
;
589 #ifdef CONFIG_SECURITY
592 void *i_private
; /* fs or device private pointer */
596 * inode->i_mutex nesting subclasses for the lock validator:
598 * 0: the object of the current VFS operation
603 * The locking order between these classes is
604 * parent -> child -> normal -> xattr -> quota
606 enum inode_i_mutex_lock_class
615 extern void inode_double_lock(struct inode
*inode1
, struct inode
*inode2
);
616 extern void inode_double_unlock(struct inode
*inode1
, struct inode
*inode2
);
619 * NOTE: in a 32bit arch with a preemptable kernel and
620 * an UP compile the i_size_read/write must be atomic
621 * with respect to the local cpu (unlike with preempt disabled),
622 * but they don't need to be atomic with respect to other cpus like in
623 * true SMP (so they need either to either locally disable irq around
624 * the read or for example on x86 they can be still implemented as a
625 * cmpxchg8b without the need of the lock prefix). For SMP compiles
626 * and 64bit archs it makes no difference if preempt is enabled or not.
628 static inline loff_t
i_size_read(const struct inode
*inode
)
630 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
635 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
636 i_size
= inode
->i_size
;
637 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
639 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
643 i_size
= inode
->i_size
;
647 return inode
->i_size
;
652 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
653 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
654 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
656 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
658 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
659 write_seqcount_begin(&inode
->i_size_seqcount
);
660 inode
->i_size
= i_size
;
661 write_seqcount_end(&inode
->i_size_seqcount
);
662 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
664 inode
->i_size
= i_size
;
667 inode
->i_size
= i_size
;
671 static inline unsigned iminor(const struct inode
*inode
)
673 return MINOR(inode
->i_rdev
);
676 static inline unsigned imajor(const struct inode
*inode
)
678 return MAJOR(inode
->i_rdev
);
681 extern struct block_device
*I_BDEV(struct inode
*inode
);
684 rwlock_t lock
; /* protects pid, uid, euid fields */
685 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
686 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
687 uid_t uid
, euid
; /* uid/euid of process setting the owner */
688 int signum
; /* posix.1b rt signal to be delivered on IO */
692 * Track a single file's readahead state
694 struct file_ra_state
{
695 unsigned long start
; /* Current window */
697 unsigned long flags
; /* ra flags RA_FLAG_xxx*/
698 unsigned long cache_hit
; /* cache hit count*/
699 unsigned long prev_index
; /* Cache last read() position */
700 unsigned long ahead_start
; /* Ahead window */
701 unsigned long ahead_size
;
702 unsigned long ra_pages
; /* Maximum readahead window */
703 unsigned long mmap_hit
; /* Cache hit stat for mmap accesses */
704 unsigned long mmap_miss
; /* Cache miss stat for mmap accesses */
705 unsigned int prev_offset
; /* Offset where last read() ended in a page */
707 #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
708 #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
712 * fu_list becomes invalid after file_free is called and queued via
713 * fu_rcuhead for RCU freeing
716 struct list_head fu_list
;
717 struct rcu_head fu_rcuhead
;
720 #define f_dentry f_path.dentry
721 #define f_vfsmnt f_path.mnt
722 const struct file_operations
*f_op
;
724 unsigned int f_flags
;
727 struct fown_struct f_owner
;
728 unsigned int f_uid
, f_gid
;
729 struct file_ra_state f_ra
;
731 unsigned long f_version
;
732 #ifdef CONFIG_SECURITY
735 /* needed for tty driver, and maybe others */
739 /* Used by fs/eventpoll.c to link all the hooks to this file */
740 struct list_head f_ep_links
;
741 spinlock_t f_ep_lock
;
742 #endif /* #ifdef CONFIG_EPOLL */
743 struct address_space
*f_mapping
;
745 extern spinlock_t files_lock
;
746 #define file_list_lock() spin_lock(&files_lock);
747 #define file_list_unlock() spin_unlock(&files_lock);
749 #define get_file(x) atomic_inc(&(x)->f_count)
750 #define file_count(x) atomic_read(&(x)->f_count)
752 #define MAX_NON_LFS ((1UL<<31) - 1)
754 /* Page cache limit. The filesystems should put that into their s_maxbytes
755 limits, otherwise bad things can happen in VM. */
756 #if BITS_PER_LONG==32
757 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
758 #elif BITS_PER_LONG==64
759 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
764 #define FL_ACCESS 8 /* not trying to lock, just looking */
765 #define FL_EXISTS 16 /* when unlocking, test for existence */
766 #define FL_LEASE 32 /* lease held on this file */
767 #define FL_CLOSE 64 /* unlock on close */
768 #define FL_SLEEP 128 /* A blocking lock */
771 * The POSIX file lock owner is determined by
772 * the "struct files_struct" in the thread group
773 * (or NULL for no owner - BSD locks).
775 * Lockd stuffs a "host" pointer into this.
777 typedef struct files_struct
*fl_owner_t
;
779 struct file_lock_operations
{
780 void (*fl_insert
)(struct file_lock
*); /* lock insertion callback */
781 void (*fl_remove
)(struct file_lock
*); /* lock removal callback */
782 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
783 void (*fl_release_private
)(struct file_lock
*);
786 struct lock_manager_operations
{
787 int (*fl_compare_owner
)(struct file_lock
*, struct file_lock
*);
788 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
789 int (*fl_grant
)(struct file_lock
*, struct file_lock
*, int);
790 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
791 void (*fl_release_private
)(struct file_lock
*);
792 void (*fl_break
)(struct file_lock
*);
793 int (*fl_mylease
)(struct file_lock
*, struct file_lock
*);
794 int (*fl_change
)(struct file_lock
**, int);
797 /* that will die - we need it for nfs_lock_info */
798 #include <linux/nfs_fs_i.h>
801 struct file_lock
*fl_next
; /* singly linked list for this inode */
802 struct list_head fl_link
; /* doubly linked list of all locks */
803 struct list_head fl_block
; /* circular list of blocked processes */
806 wait_queue_head_t fl_wait
;
807 struct file
*fl_file
;
808 unsigned char fl_flags
;
809 unsigned char fl_type
;
813 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
814 unsigned long fl_break_time
; /* for nonblocking lease breaks */
816 struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
817 struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
819 struct nfs_lock_info nfs_fl
;
820 struct nfs4_lock_info nfs4_fl
;
824 /* The following constant reflects the upper bound of the file/locking space */
826 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
827 #define OFFSET_MAX INT_LIMIT(loff_t)
828 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
831 #include <linux/fcntl.h>
833 extern int fcntl_getlk(struct file
*, struct flock __user
*);
834 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
835 struct flock __user
*);
837 #if BITS_PER_LONG == 32
838 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
839 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
840 struct flock64 __user
*);
843 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
844 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
845 extern int fcntl_getlease(struct file
*filp
);
848 extern int do_sync_mapping_range(struct address_space
*mapping
, loff_t offset
,
849 loff_t endbyte
, unsigned int flags
);
850 static inline int do_sync_file_range(struct file
*file
, loff_t offset
,
851 loff_t endbyte
, unsigned int flags
)
853 return do_sync_mapping_range(file
->f_mapping
, offset
, endbyte
, flags
);
857 extern void locks_init_lock(struct file_lock
*);
858 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
859 extern void locks_remove_posix(struct file
*, fl_owner_t
);
860 extern void locks_remove_flock(struct file
*);
861 extern int posix_test_lock(struct file
*, struct file_lock
*);
862 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
863 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
864 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
865 extern int vfs_test_lock(struct file
*, struct file_lock
*);
866 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
867 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
868 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
869 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
870 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
871 extern int setlease(struct file
*, long, struct file_lock
**);
872 extern int lease_modify(struct file_lock
**, int);
873 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
874 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
876 struct fasync_struct
{
879 struct fasync_struct
*fa_next
; /* singly linked list */
880 struct file
*fa_file
;
883 #define FASYNC_MAGIC 0x4601
885 /* SMP safe fasync helpers: */
886 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
887 /* can be called from interrupts */
888 extern void kill_fasync(struct fasync_struct
**, int, int);
889 /* only for net: no internal synchronization */
890 extern void __kill_fasync(struct fasync_struct
*, int, int);
892 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
893 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
894 extern void f_delown(struct file
*filp
);
895 extern pid_t
f_getown(struct file
*filp
);
896 extern int send_sigurg(struct fown_struct
*fown
);
902 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
903 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
904 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
906 extern struct list_head super_blocks
;
907 extern spinlock_t sb_lock
;
909 #define sb_entry(list) list_entry((list), struct super_block, s_list)
910 #define S_BIAS (1<<30)
912 struct list_head s_list
; /* Keep this first */
913 dev_t s_dev
; /* search index; _not_ kdev_t */
914 unsigned long s_blocksize
;
915 unsigned char s_blocksize_bits
;
916 unsigned char s_dirt
;
917 unsigned long long s_maxbytes
; /* Max file size */
918 struct file_system_type
*s_type
;
919 const struct super_operations
*s_op
;
920 struct dquot_operations
*dq_op
;
921 struct quotactl_ops
*s_qcop
;
922 struct export_operations
*s_export_op
;
923 unsigned long s_flags
;
924 unsigned long s_magic
;
925 struct dentry
*s_root
;
926 struct rw_semaphore s_umount
;
932 #ifdef CONFIG_SECURITY
935 struct xattr_handler
**s_xattr
;
937 struct list_head s_inodes
; /* all inodes */
938 struct list_head s_dirty
; /* dirty inodes */
939 struct list_head s_io
; /* parked for writeback */
940 struct hlist_head s_anon
; /* anonymous dentries for (nfs) exporting */
941 struct list_head s_files
;
943 struct block_device
*s_bdev
;
944 struct list_head s_instances
;
945 struct quota_info s_dquot
; /* Diskquota specific options */
948 wait_queue_head_t s_wait_unfrozen
;
950 char s_id
[32]; /* Informational name */
952 void *s_fs_info
; /* Filesystem private info */
955 * The next field is for VFS *only*. No filesystems have any business
956 * even looking at it. You had been warned.
958 struct mutex s_vfs_rename_mutex
; /* Kludge */
960 /* Granularity of c/m/atime in ns.
961 Cannot be worse than a second */
965 extern struct timespec
current_fs_time(struct super_block
*sb
);
968 * Snapshotting support.
976 #define vfs_check_frozen(sb, level) \
977 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
979 #define get_fs_excl() atomic_inc(¤t->fs_excl)
980 #define put_fs_excl() atomic_dec(¤t->fs_excl)
981 #define has_fs_excl() atomic_read(¤t->fs_excl)
983 /* not quite ready to be deprecated, but... */
984 extern void lock_super(struct super_block
*);
985 extern void unlock_super(struct super_block
*);
988 * VFS helper functions..
990 extern int vfs_permission(struct nameidata
*, int);
991 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
992 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
993 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
994 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *, int);
995 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
996 extern int vfs_rmdir(struct inode
*, struct dentry
*);
997 extern int vfs_unlink(struct inode
*, struct dentry
*);
998 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1001 * VFS dentry helper functions.
1003 extern void dentry_unhash(struct dentry
*dentry
);
1006 * VFS file helper functions.
1008 extern int file_permission(struct file
*, int);
1013 * NOTE! These match bits 12..15 of stat.st_mode
1014 * (ie "(i_mode >> 12) & 15").
1016 #define DT_UNKNOWN 0
1026 #define OSYNC_METADATA (1<<0)
1027 #define OSYNC_DATA (1<<1)
1028 #define OSYNC_INODE (1<<2)
1029 int generic_osync_inode(struct inode
*, struct address_space
*, int);
1032 * This is the "filldir" function type, used by readdir() to let
1033 * the kernel specify what kind of dirent layout it wants to have.
1034 * This allows the kernel to read directories into kernel space or
1035 * to have different dirent layouts depending on the binary type.
1037 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1039 struct block_device_operations
{
1040 int (*open
) (struct inode
*, struct file
*);
1041 int (*release
) (struct inode
*, struct file
*);
1042 int (*ioctl
) (struct inode
*, struct file
*, unsigned, unsigned long);
1043 long (*unlocked_ioctl
) (struct file
*, unsigned, unsigned long);
1044 long (*compat_ioctl
) (struct file
*, unsigned, unsigned long);
1045 int (*direct_access
) (struct block_device
*, sector_t
, unsigned long *);
1046 int (*media_changed
) (struct gendisk
*);
1047 int (*revalidate_disk
) (struct gendisk
*);
1048 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1049 struct module
*owner
;
1053 * "descriptor" for what we're up to with a read for sendfile().
1054 * This allows us to use the same read code yet
1055 * have multiple different users of the data that
1056 * we read from a file.
1058 * The simplest case just copies the data to user
1069 } read_descriptor_t
;
1071 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*, unsigned long, unsigned long);
1073 /* These macros are for out of kernel modules to test that
1074 * the kernel supports the unlocked_ioctl and compat_ioctl
1075 * fields in struct file_operations. */
1076 #define HAVE_COMPAT_IOCTL 1
1077 #define HAVE_UNLOCKED_IOCTL 1
1081 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1082 * can be called without the big kernel lock held in all filesystems.
1084 struct file_operations
{
1085 struct module
*owner
;
1086 loff_t (*llseek
) (struct file
*, loff_t
, int);
1087 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1088 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1089 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1090 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1091 int (*readdir
) (struct file
*, void *, filldir_t
);
1092 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1093 int (*ioctl
) (struct inode
*, struct file
*, unsigned int, unsigned long);
1094 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1095 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1096 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1097 int (*open
) (struct inode
*, struct file
*);
1098 int (*flush
) (struct file
*, fl_owner_t id
);
1099 int (*release
) (struct inode
*, struct file
*);
1100 int (*fsync
) (struct file
*, struct dentry
*, int datasync
);
1101 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1102 int (*fasync
) (int, struct file
*, int);
1103 int (*lock
) (struct file
*, int, struct file_lock
*);
1104 ssize_t (*sendfile
) (struct file
*, loff_t
*, size_t, read_actor_t
, void *);
1105 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1106 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1107 int (*check_flags
)(int);
1108 int (*dir_notify
)(struct file
*filp
, unsigned long arg
);
1109 int (*flock
) (struct file
*, int, struct file_lock
*);
1110 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1111 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1114 struct inode_operations
{
1115 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1116 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1117 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1118 int (*unlink
) (struct inode
*,struct dentry
*);
1119 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1120 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1121 int (*rmdir
) (struct inode
*,struct dentry
*);
1122 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1123 int (*rename
) (struct inode
*, struct dentry
*,
1124 struct inode
*, struct dentry
*);
1125 int (*readlink
) (struct dentry
*, char __user
*,int);
1126 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1127 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1128 void (*truncate
) (struct inode
*);
1129 int (*permission
) (struct inode
*, int, struct nameidata
*);
1130 int (*setattr
) (struct dentry
*, struct iattr
*);
1131 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1132 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1133 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1134 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1135 int (*removexattr
) (struct dentry
*, const char *);
1136 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1141 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1142 unsigned long nr_segs
, unsigned long fast_segs
,
1143 struct iovec
*fast_pointer
,
1144 struct iovec
**ret_pointer
);
1146 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1147 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1148 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1149 unsigned long, loff_t
*);
1150 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1151 unsigned long, loff_t
*);
1154 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1155 * without the big kernel lock held in all filesystems.
1157 struct super_operations
{
1158 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1159 void (*destroy_inode
)(struct inode
*);
1161 void (*read_inode
) (struct inode
*);
1163 void (*dirty_inode
) (struct inode
*);
1164 int (*write_inode
) (struct inode
*, int);
1165 void (*put_inode
) (struct inode
*);
1166 void (*drop_inode
) (struct inode
*);
1167 void (*delete_inode
) (struct inode
*);
1168 void (*put_super
) (struct super_block
*);
1169 void (*write_super
) (struct super_block
*);
1170 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1171 void (*write_super_lockfs
) (struct super_block
*);
1172 void (*unlockfs
) (struct super_block
*);
1173 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1174 int (*remount_fs
) (struct super_block
*, int *, char *);
1175 void (*clear_inode
) (struct inode
*);
1176 void (*umount_begin
) (struct vfsmount
*, int);
1178 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1179 int (*show_stats
)(struct seq_file
*, struct vfsmount
*);
1181 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1182 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1186 /* Inode state bits. Protected by inode_lock. */
1187 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1188 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1189 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1191 #define I_LOCK (1 << __I_LOCK)
1192 #define I_FREEING 16
1195 #define I_WILL_FREE 128
1197 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1199 extern void __mark_inode_dirty(struct inode
*, int);
1200 static inline void mark_inode_dirty(struct inode
*inode
)
1202 __mark_inode_dirty(inode
, I_DIRTY
);
1205 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1207 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1210 static inline void inc_nlink(struct inode
*inode
)
1215 static inline void inode_inc_link_count(struct inode
*inode
)
1218 mark_inode_dirty(inode
);
1221 static inline void drop_nlink(struct inode
*inode
)
1226 static inline void clear_nlink(struct inode
*inode
)
1231 static inline void inode_dec_link_count(struct inode
*inode
)
1234 mark_inode_dirty(inode
);
1237 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1238 static inline void file_accessed(struct file
*file
)
1240 if (!(file
->f_flags
& O_NOATIME
))
1241 touch_atime(file
->f_path
.mnt
, file
->f_path
.dentry
);
1244 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1247 * struct export_operations - for nfsd to communicate with file systems
1248 * @decode_fh: decode a file handle fragment and return a &struct dentry
1249 * @encode_fh: encode a file handle fragment from a dentry
1250 * @get_name: find the name for a given inode in a given directory
1251 * @get_parent: find the parent of a given directory
1252 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
1253 * @find_exported_dentry:
1254 * set by the exporting module to a standard helper function.
1257 * The export_operations structure provides a means for nfsd to communicate
1258 * with a particular exported file system - particularly enabling nfsd and
1259 * the filesystem to co-operate when dealing with file handles.
1261 * export_operations contains two basic operation for dealing with file
1262 * handles, decode_fh() and encode_fh(), and allows for some other
1263 * operations to be defined which standard helper routines use to get
1264 * specific information from the filesystem.
1266 * nfsd encodes information use to determine which filesystem a filehandle
1267 * applies to in the initial part of the file handle. The remainder, termed
1268 * a file handle fragment, is controlled completely by the filesystem. The
1269 * standard helper routines assume that this fragment will contain one or
1270 * two sub-fragments, one which identifies the file, and one which may be
1271 * used to identify the (a) directory containing the file.
1273 * In some situations, nfsd needs to get a dentry which is connected into a
1274 * specific part of the file tree. To allow for this, it passes the
1275 * function acceptable() together with a @context which can be used to see
1276 * if the dentry is acceptable. As there can be multiple dentrys for a
1277 * given file, the filesystem should check each one for acceptability before
1278 * looking for the next. As soon as an acceptable one is found, it should
1282 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1283 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1284 * @context). It should return a &struct dentry which refers to the same
1285 * file that the file handle fragment refers to, and which passes the
1286 * acceptability test. If it cannot, it should return a %NULL pointer if
1287 * the file was found but no acceptable &dentries were available, or a
1288 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1292 * @encode_fh should store in the file handle fragment @fh (using at most
1293 * @max_len bytes) information that can be used by @decode_fh to recover the
1294 * file refered to by the &struct dentry @de. If the @connectable flag is
1295 * set, the encode_fh() should store sufficient information so that a good
1296 * attempt can be made to find not only the file but also it's place in the
1297 * filesystem. This typically means storing a reference to de->d_parent in
1298 * the filehandle fragment. encode_fh() should return the number of bytes
1299 * stored or a negative error code such as %-ENOSPC
1302 * @get_name should find a name for the given @child in the given @parent
1303 * directory. The name should be stored in the @name (with the
1304 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1305 * buffer. get_name() should return %0 on success, a negative error code
1306 * or error. @get_name will be called without @parent->i_mutex held.
1309 * @get_parent should find the parent directory for the given @child which
1310 * is also a directory. In the event that it cannot be found, or storage
1311 * space cannot be allocated, a %ERR_PTR should be returned.
1314 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1315 * identifier, possibly an inode number, (@inump) get_dentry() should find
1316 * the identified inode and return a dentry for that inode. Any suitable
1317 * dentry can be returned including, if necessary, a new dentry created with
1318 * d_alloc_root. The caller can then find any other extant dentrys by
1319 * following the d_alias links. If a new dentry was created using
1320 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1321 * should be d_rehash()ed.
1323 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1324 * can be returned. The @inump will be whatever was passed to
1325 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
1328 * get_parent is called with child->d_inode->i_mutex down
1329 * get_name is not (which is possibly inconsistent)
1332 struct export_operations
{
1333 struct dentry
*(*decode_fh
)(struct super_block
*sb
, __u32
*fh
, int fh_len
, int fh_type
,
1334 int (*acceptable
)(void *context
, struct dentry
*de
),
1336 int (*encode_fh
)(struct dentry
*de
, __u32
*fh
, int *max_len
,
1339 /* the following are only called from the filesystem itself */
1340 int (*get_name
)(struct dentry
*parent
, char *name
,
1341 struct dentry
*child
);
1342 struct dentry
* (*get_parent
)(struct dentry
*child
);
1343 struct dentry
* (*get_dentry
)(struct super_block
*sb
, void *inump
);
1345 /* This is set by the exporting module to a standard helper */
1346 struct dentry
* (*find_exported_dentry
)(
1347 struct super_block
*sb
, void *obj
, void *parent
,
1348 int (*acceptable
)(void *context
, struct dentry
*de
),
1354 extern struct dentry
*
1355 find_exported_dentry(struct super_block
*sb
, void *obj
, void *parent
,
1356 int (*acceptable
)(void *context
, struct dentry
*de
),
1359 struct file_system_type
{
1362 int (*get_sb
) (struct file_system_type
*, int,
1363 const char *, void *, struct vfsmount
*);
1364 void (*kill_sb
) (struct super_block
*);
1365 struct module
*owner
;
1366 struct file_system_type
* next
;
1367 struct list_head fs_supers
;
1368 struct lock_class_key s_lock_key
;
1369 struct lock_class_key s_umount_key
;
1372 extern int get_sb_bdev(struct file_system_type
*fs_type
,
1373 int flags
, const char *dev_name
, void *data
,
1374 int (*fill_super
)(struct super_block
*, void *, int),
1375 struct vfsmount
*mnt
);
1376 extern int get_sb_single(struct file_system_type
*fs_type
,
1377 int flags
, void *data
,
1378 int (*fill_super
)(struct super_block
*, void *, int),
1379 struct vfsmount
*mnt
);
1380 extern int get_sb_nodev(struct file_system_type
*fs_type
,
1381 int flags
, void *data
,
1382 int (*fill_super
)(struct super_block
*, void *, int),
1383 struct vfsmount
*mnt
);
1384 void generic_shutdown_super(struct super_block
*sb
);
1385 void kill_block_super(struct super_block
*sb
);
1386 void kill_anon_super(struct super_block
*sb
);
1387 void kill_litter_super(struct super_block
*sb
);
1388 void deactivate_super(struct super_block
*sb
);
1389 int set_anon_super(struct super_block
*s
, void *data
);
1390 struct super_block
*sget(struct file_system_type
*type
,
1391 int (*test
)(struct super_block
*,void *),
1392 int (*set
)(struct super_block
*,void *),
1394 extern int get_sb_pseudo(struct file_system_type
*, char *,
1395 const struct super_operations
*ops
, unsigned long,
1396 struct vfsmount
*mnt
);
1397 extern int simple_set_mnt(struct vfsmount
*mnt
, struct super_block
*sb
);
1398 int __put_super(struct super_block
*sb
);
1399 int __put_super_and_need_restart(struct super_block
*sb
);
1400 void unnamed_dev_init(void);
1402 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1403 #define fops_get(fops) \
1404 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1405 #define fops_put(fops) \
1406 do { if (fops) module_put((fops)->owner); } while(0)
1408 extern int register_filesystem(struct file_system_type
*);
1409 extern int unregister_filesystem(struct file_system_type
*);
1410 extern struct vfsmount
*kern_mount(struct file_system_type
*);
1411 extern int may_umount_tree(struct vfsmount
*);
1412 extern int may_umount(struct vfsmount
*);
1413 extern void umount_tree(struct vfsmount
*, int, struct list_head
*);
1414 extern void release_mounts(struct list_head
*);
1415 extern long do_mount(char *, char *, char *, unsigned long, void *);
1416 extern struct vfsmount
*copy_tree(struct vfsmount
*, struct dentry
*, int);
1417 extern void mnt_set_mountpoint(struct vfsmount
*, struct dentry
*,
1420 extern int vfs_statfs(struct dentry
*, struct kstatfs
*);
1423 extern struct kset fs_subsys
;
1425 #define FLOCK_VERIFY_READ 1
1426 #define FLOCK_VERIFY_WRITE 2
1428 extern int locks_mandatory_locked(struct inode
*);
1429 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1432 * Candidates for mandatory locking have the setgid bit set
1433 * but no group execute bit - an otherwise meaningless combination.
1435 #define MANDATORY_LOCK(inode) \
1436 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1438 static inline int locks_verify_locked(struct inode
*inode
)
1440 if (MANDATORY_LOCK(inode
))
1441 return locks_mandatory_locked(inode
);
1445 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1447 static inline int locks_verify_truncate(struct inode
*inode
,
1451 if (inode
->i_flock
&& MANDATORY_LOCK(inode
))
1452 return locks_mandatory_area(
1453 FLOCK_VERIFY_WRITE
, inode
, filp
,
1454 size
< inode
->i_size
? size
: inode
->i_size
,
1455 (size
< inode
->i_size
? inode
->i_size
- size
1456 : size
- inode
->i_size
)
1461 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1464 return __break_lease(inode
, mode
);
1470 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
1472 extern long do_sys_open(int fdf
, const char __user
*filename
, int flags
,
1474 extern struct file
*filp_open(const char *, int, int);
1475 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int);
1476 extern int filp_close(struct file
*, fl_owner_t id
);
1477 extern char * getname(const char __user
*);
1480 extern void __init
vfs_caches_init_early(void);
1481 extern void __init
vfs_caches_init(unsigned long);
1483 extern struct kmem_cache
*names_cachep
;
1485 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
1486 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1487 #ifndef CONFIG_AUDITSYSCALL
1488 #define putname(name) __putname(name)
1490 extern void putname(const char *name
);
1494 extern int register_blkdev(unsigned int, const char *);
1495 extern int unregister_blkdev(unsigned int, const char *);
1496 extern struct block_device
*bdget(dev_t
);
1497 extern void bd_set_size(struct block_device
*, loff_t size
);
1498 extern void bd_forget(struct inode
*inode
);
1499 extern void bdput(struct block_device
*);
1500 extern struct block_device
*open_by_devnum(dev_t
, unsigned);
1501 extern const struct address_space_operations def_blk_aops
;
1503 static inline void bd_forget(struct inode
*inode
) {}
1505 extern const struct file_operations def_blk_fops
;
1506 extern const struct file_operations def_chr_fops
;
1507 extern const struct file_operations bad_sock_fops
;
1508 extern const struct file_operations def_fifo_fops
;
1510 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
1511 extern int blkdev_ioctl(struct inode
*, struct file
*, unsigned, unsigned long);
1512 extern int blkdev_driver_ioctl(struct inode
*inode
, struct file
*file
,
1513 struct gendisk
*disk
, unsigned cmd
,
1515 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
1516 extern int blkdev_get(struct block_device
*, mode_t
, unsigned);
1517 extern int blkdev_put(struct block_device
*);
1518 extern int bd_claim(struct block_device
*, void *);
1519 extern void bd_release(struct block_device
*);
1521 extern int bd_claim_by_disk(struct block_device
*, void *, struct gendisk
*);
1522 extern void bd_release_from_disk(struct block_device
*, struct gendisk
*);
1524 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1525 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1530 #define CHRDEV_MAJOR_HASH_SIZE 255
1531 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
1532 extern int register_chrdev_region(dev_t
, unsigned, const char *);
1533 extern int register_chrdev(unsigned int, const char *,
1534 const struct file_operations
*);
1535 extern int unregister_chrdev(unsigned int, const char *);
1536 extern void unregister_chrdev_region(dev_t
, unsigned);
1537 extern int chrdev_open(struct inode
*, struct file
*);
1538 extern void chrdev_show(struct seq_file
*,off_t
);
1540 /* fs/block_dev.c */
1541 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1544 #define BLKDEV_MAJOR_HASH_SIZE 255
1545 extern const char *__bdevname(dev_t
, char *buffer
);
1546 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
1547 extern struct block_device
*lookup_bdev(const char *);
1548 extern struct block_device
*open_bdev_excl(const char *, int, void *);
1549 extern void close_bdev_excl(struct block_device
*);
1550 extern void blkdev_show(struct seq_file
*,off_t
);
1552 #define BLKDEV_MAJOR_HASH_SIZE 0
1555 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
1557 /* Invalid inode operations -- fs/bad_inode.c */
1558 extern void make_bad_inode(struct inode
*);
1559 extern int is_bad_inode(struct inode
*);
1561 extern const struct file_operations read_fifo_fops
;
1562 extern const struct file_operations write_fifo_fops
;
1563 extern const struct file_operations rdwr_fifo_fops
;
1565 extern int fs_may_remount_ro(struct super_block
*);
1569 * return READ, READA, or WRITE
1571 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1574 * return data direction, READ or WRITE
1576 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1578 extern int check_disk_change(struct block_device
*);
1579 extern int __invalidate_device(struct block_device
*);
1580 extern int invalidate_partition(struct gendisk
*, int);
1582 extern int invalidate_inodes(struct super_block
*);
1583 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
1584 pgoff_t start
, pgoff_t end
);
1586 static inline unsigned long __deprecated
1587 invalidate_inode_pages(struct address_space
*mapping
)
1589 return invalidate_mapping_pages(mapping
, 0, ~0UL);
1592 static inline void invalidate_remote_inode(struct inode
*inode
)
1594 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
1595 S_ISLNK(inode
->i_mode
))
1596 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
1598 extern int invalidate_inode_pages2(struct address_space
*mapping
);
1599 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
1600 pgoff_t start
, pgoff_t end
);
1601 extern int write_inode_now(struct inode
*, int);
1602 extern int filemap_fdatawrite(struct address_space
*);
1603 extern int filemap_flush(struct address_space
*);
1604 extern int filemap_fdatawait(struct address_space
*);
1605 extern int filemap_write_and_wait(struct address_space
*mapping
);
1606 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
1607 loff_t lstart
, loff_t lend
);
1608 extern int wait_on_page_writeback_range(struct address_space
*mapping
,
1609 pgoff_t start
, pgoff_t end
);
1610 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
1611 loff_t start
, loff_t end
, int sync_mode
);
1613 extern long do_fsync(struct file
*file
, int datasync
);
1614 extern void sync_supers(void);
1615 extern void sync_filesystems(int wait
);
1616 extern void __fsync_super(struct super_block
*sb
);
1617 extern void emergency_sync(void);
1618 extern void emergency_remount(void);
1619 extern int do_remount_sb(struct super_block
*sb
, int flags
,
1620 void *data
, int force
);
1622 extern sector_t
bmap(struct inode
*, sector_t
);
1624 extern int notify_change(struct dentry
*, struct iattr
*);
1625 extern int permission(struct inode
*, int, struct nameidata
*);
1626 extern int generic_permission(struct inode
*, int,
1627 int (*check_acl
)(struct inode
*, int));
1629 extern int get_write_access(struct inode
*);
1630 extern int deny_write_access(struct file
*);
1631 static inline void put_write_access(struct inode
* inode
)
1633 atomic_dec(&inode
->i_writecount
);
1635 static inline void allow_write_access(struct file
*file
)
1638 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
1640 extern int do_pipe(int *);
1641 extern struct file
*create_read_pipe(struct file
*f
);
1642 extern struct file
*create_write_pipe(void);
1643 extern void free_write_pipe(struct file
*);
1645 extern int open_namei(int dfd
, const char *, int, int, struct nameidata
*);
1646 extern int may_open(struct nameidata
*, int, int);
1648 extern int kernel_read(struct file
*, unsigned long, char *, unsigned long);
1649 extern struct file
* open_exec(const char *);
1651 /* fs/dcache.c -- generic fs support functions */
1652 extern int is_subdir(struct dentry
*, struct dentry
*);
1653 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
1655 #include <linux/err.h>
1657 /* needed for stackable file system support */
1658 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
1660 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
1662 extern void inode_init_once(struct inode
*);
1663 extern void iput(struct inode
*);
1664 extern struct inode
* igrab(struct inode
*);
1665 extern ino_t
iunique(struct super_block
*, ino_t
);
1666 extern int inode_needs_sync(struct inode
*inode
);
1667 extern void generic_delete_inode(struct inode
*inode
);
1668 extern void generic_drop_inode(struct inode
*inode
);
1670 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
1671 unsigned long hashval
, int (*test
)(struct inode
*, void *),
1673 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
1674 int (*test
)(struct inode
*, void *), void *data
);
1675 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
1677 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
1678 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
1679 extern void unlock_new_inode(struct inode
*);
1681 static inline struct inode
*iget(struct super_block
*sb
, unsigned long ino
)
1683 struct inode
*inode
= iget_locked(sb
, ino
);
1685 if (inode
&& (inode
->i_state
& I_NEW
)) {
1686 sb
->s_op
->read_inode(inode
);
1687 unlock_new_inode(inode
);
1693 extern void __iget(struct inode
* inode
);
1694 extern void clear_inode(struct inode
*);
1695 extern void destroy_inode(struct inode
*);
1696 extern struct inode
*new_inode(struct super_block
*);
1697 extern int __remove_suid(struct dentry
*, int);
1698 extern int should_remove_suid(struct dentry
*);
1699 extern int remove_suid(struct dentry
*);
1701 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
1702 extern void remove_inode_hash(struct inode
*);
1703 static inline void insert_inode_hash(struct inode
*inode
) {
1704 __insert_inode_hash(inode
, inode
->i_ino
);
1707 extern struct file
* get_empty_filp(void);
1708 extern void file_move(struct file
*f
, struct list_head
*list
);
1709 extern void file_kill(struct file
*f
);
1712 extern void submit_bio(int, struct bio
*);
1713 extern int bdev_read_only(struct block_device
*);
1715 extern int set_blocksize(struct block_device
*, int);
1716 extern int sb_set_blocksize(struct super_block
*, int);
1717 extern int sb_min_blocksize(struct super_block
*, int);
1719 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
1720 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
1721 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
1722 extern int file_send_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
1723 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
1724 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1725 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1726 extern ssize_t
generic_file_aio_write_nolock(struct kiocb
*, const struct iovec
*,
1727 unsigned long, loff_t
);
1728 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
1729 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
1730 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
1731 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
1732 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
1733 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
1734 extern ssize_t
generic_file_sendfile(struct file
*, loff_t
*, size_t, read_actor_t
, void *);
1735 extern void do_generic_mapping_read(struct address_space
*mapping
,
1736 struct file_ra_state
*, struct file
*,
1737 loff_t
*, read_descriptor_t
*, read_actor_t
);
1740 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
1741 struct pipe_inode_info
*, size_t, unsigned int);
1742 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
1743 struct file
*, loff_t
*, size_t, unsigned int);
1744 extern ssize_t
generic_file_splice_write_nolock(struct pipe_inode_info
*,
1745 struct file
*, loff_t
*, size_t, unsigned int);
1746 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
1747 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
1748 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
1749 size_t len
, unsigned int flags
);
1752 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
1753 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
1754 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
1755 extern loff_t
remote_llseek(struct file
*file
, loff_t offset
, int origin
);
1756 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
1757 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
1759 #ifdef CONFIG_FS_XIP
1760 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
1762 extern ssize_t
xip_file_sendfile(struct file
*in_file
, loff_t
*ppos
,
1763 size_t count
, read_actor_t actor
,
1765 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
1766 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
1767 size_t len
, loff_t
*ppos
);
1768 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
1770 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
1776 static inline void do_generic_file_read(struct file
* filp
, loff_t
*ppos
,
1777 read_descriptor_t
* desc
,
1780 do_generic_mapping_read(filp
->f_mapping
,
1789 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
1790 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
1791 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
1795 DIO_LOCKING
= 1, /* need locking between buffered and direct access */
1796 DIO_NO_LOCKING
, /* bdev; no locking at all between buffered/direct */
1797 DIO_OWN_LOCKING
, /* filesystem locks buffered and direct internally */
1800 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
1801 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1802 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
1803 dio_iodone_t end_io
)
1805 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1806 nr_segs
, get_block
, end_io
, DIO_LOCKING
);
1809 static inline ssize_t
blockdev_direct_IO_no_locking(int rw
, struct kiocb
*iocb
,
1810 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1811 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
1812 dio_iodone_t end_io
)
1814 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1815 nr_segs
, get_block
, end_io
, DIO_NO_LOCKING
);
1818 static inline ssize_t
blockdev_direct_IO_own_locking(int rw
, struct kiocb
*iocb
,
1819 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1820 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
1821 dio_iodone_t end_io
)
1823 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1824 nr_segs
, get_block
, end_io
, DIO_OWN_LOCKING
);
1828 extern const struct file_operations generic_ro_fops
;
1830 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1832 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
1833 extern int vfs_follow_link(struct nameidata
*, const char *);
1834 extern int page_readlink(struct dentry
*, char __user
*, int);
1835 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
1836 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
1837 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
1839 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
1840 extern const struct inode_operations page_symlink_inode_operations
;
1841 extern int generic_readlink(struct dentry
*, char __user
*, int);
1842 extern void generic_fillattr(struct inode
*, struct kstat
*);
1843 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
1844 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
1845 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
1846 loff_t
inode_get_bytes(struct inode
*inode
);
1847 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
1849 extern int vfs_readdir(struct file
*, filldir_t
, void *);
1851 extern int vfs_stat(char __user
*, struct kstat
*);
1852 extern int vfs_lstat(char __user
*, struct kstat
*);
1853 extern int vfs_stat_fd(int dfd
, char __user
*, struct kstat
*);
1854 extern int vfs_lstat_fd(int dfd
, char __user
*, struct kstat
*);
1855 extern int vfs_fstat(unsigned int, struct kstat
*);
1857 extern int vfs_ioctl(struct file
*, unsigned int, unsigned int, unsigned long);
1859 extern struct file_system_type
*get_fs_type(const char *name
);
1860 extern struct super_block
*get_super(struct block_device
*);
1861 extern struct super_block
*user_get_super(dev_t
);
1862 extern void drop_super(struct super_block
*sb
);
1864 extern int dcache_dir_open(struct inode
*, struct file
*);
1865 extern int dcache_dir_close(struct inode
*, struct file
*);
1866 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
1867 extern int dcache_readdir(struct file
*, void *, filldir_t
);
1868 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
1869 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
1870 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
1871 extern int simple_unlink(struct inode
*, struct dentry
*);
1872 extern int simple_rmdir(struct inode
*, struct dentry
*);
1873 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1874 extern int simple_sync_file(struct file
*, struct dentry
*, int);
1875 extern int simple_empty(struct dentry
*);
1876 extern int simple_readpage(struct file
*file
, struct page
*page
);
1877 extern int simple_prepare_write(struct file
*file
, struct page
*page
,
1878 unsigned offset
, unsigned to
);
1879 extern int simple_commit_write(struct file
*file
, struct page
*page
,
1880 unsigned offset
, unsigned to
);
1882 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
1883 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
1884 extern const struct file_operations simple_dir_operations
;
1885 extern const struct inode_operations simple_dir_inode_operations
;
1886 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
1887 struct dentry
*d_alloc_name(struct dentry
*, const char *);
1888 extern int simple_fill_super(struct super_block
*, int, struct tree_descr
*);
1889 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
1890 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
1892 extern ssize_t
simple_read_from_buffer(void __user
*, size_t, loff_t
*, const void *, size_t);
1894 #ifdef CONFIG_MIGRATION
1895 extern int buffer_migrate_page(struct address_space
*,
1896 struct page
*, struct page
*);
1898 #define buffer_migrate_page NULL
1901 extern int inode_change_ok(struct inode
*, struct iattr
*);
1902 extern int __must_check
inode_setattr(struct inode
*, struct iattr
*);
1904 extern void file_update_time(struct file
*file
);
1906 static inline ino_t
parent_ino(struct dentry
*dentry
)
1910 spin_lock(&dentry
->d_lock
);
1911 res
= dentry
->d_parent
->d_inode
->i_ino
;
1912 spin_unlock(&dentry
->d_lock
);
1917 extern int unshare_files(void);
1919 /* Transaction based IO helpers */
1922 * An argresp is stored in an allocated page and holds the
1923 * size of the argument or response, along with its content
1925 struct simple_transaction_argresp
{
1930 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1932 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
1934 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
1935 size_t size
, loff_t
*pos
);
1936 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
1938 static inline void simple_transaction_set(struct file
*file
, size_t n
)
1940 struct simple_transaction_argresp
*ar
= file
->private_data
;
1942 BUG_ON(n
> SIMPLE_TRANSACTION_LIMIT
);
1945 * The barrier ensures that ar->size will really remain zero until
1946 * ar->data is ready for reading.
1953 * simple attribute files
1955 * These attributes behave similar to those in sysfs:
1957 * Writing to an attribute immediately sets a value, an open file can be
1958 * written to multiple times.
1960 * Reading from an attribute creates a buffer from the value that might get
1961 * read with multiple read calls. When the attribute has been read
1962 * completely, no further read calls are possible until the file is opened
1965 * All attributes contain a text representation of a numeric value
1966 * that are accessed with the get() and set() functions.
1968 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1969 static int __fops ## _open(struct inode *inode, struct file *file) \
1971 __simple_attr_check_format(__fmt, 0ull); \
1972 return simple_attr_open(inode, file, __get, __set, __fmt); \
1974 static struct file_operations __fops = { \
1975 .owner = THIS_MODULE, \
1976 .open = __fops ## _open, \
1977 .release = simple_attr_close, \
1978 .read = simple_attr_read, \
1979 .write = simple_attr_write, \
1982 static inline void __attribute__((format(printf
, 1, 2)))
1983 __simple_attr_check_format(const char *fmt
, ...)
1985 /* don't do anything, just let the compiler check the arguments; */
1988 int simple_attr_open(struct inode
*inode
, struct file
*file
,
1989 u64 (*get
)(void *), void (*set
)(void *, u64
),
1991 int simple_attr_close(struct inode
*inode
, struct file
*file
);
1992 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
1993 size_t len
, loff_t
*ppos
);
1994 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
1995 size_t len
, loff_t
*ppos
);
1998 #ifdef CONFIG_SECURITY
1999 static inline char *alloc_secdata(void)
2001 return (char *)get_zeroed_page(GFP_KERNEL
);
2004 static inline void free_secdata(void *secdata
)
2006 free_page((unsigned long)secdata
);
2009 static inline char *alloc_secdata(void)
2014 static inline void free_secdata(void *secdata
)
2016 #endif /* CONFIG_SECURITY */
2018 #endif /* __KERNEL__ */
2019 #endif /* _LINUX_FS_H */