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 extern int sysctl_nr_open;
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 */
33 #define SEEK_MAX SEEK_END
35 /* And dynamically-tunable limits and defaults: */
36 struct files_stat_struct {
37 int nr_files; /* read only */
38 int nr_free_files; /* read only */
39 int max_files; /* tunable */
41 extern struct files_stat_struct files_stat;
42 extern int get_max_files(void);
44 struct inodes_stat_t {
47 int dummy[5]; /* padding for sysctl ABI compatibility */
49 extern struct inodes_stat_t inodes_stat;
51 extern int leases_enable, lease_break_time;
54 extern int dir_notify_enable;
57 #define NR_FILE 8192 /* this can well be larger on a larger system */
66 #define FMODE_READ ((__force fmode_t)1)
67 #define FMODE_WRITE ((__force fmode_t)2)
69 /* Internal kernel extensions */
70 #define FMODE_LSEEK ((__force fmode_t)4)
71 #define FMODE_PREAD ((__force fmode_t)8)
72 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
74 /* File is being opened for execution. Primary users of this flag are
75 distributed filesystems that can use it to achieve correct ETXTBUSY
76 behavior for cross-node execution/opening_for_writing of files */
77 #define FMODE_EXEC ((__force fmode_t)16)
79 #define FMODE_NDELAY ((__force fmode_t)32)
80 #define FMODE_EXCL ((__force fmode_t)64)
81 #define FMODE_WRITE_IOCTL ((__force fmode_t)128)
82 #define FMODE_NDELAY_NOW ((__force fmode_t)256)
88 #define READA 2 /* read-ahead - don't block if no resources */
89 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
90 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
91 #define READ_META (READ | (1 << BIO_RW_META))
92 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
93 #define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC))
94 #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
95 #define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
96 #define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
102 /* public flags for file_system_type */
103 #define FS_REQUIRES_DEV 1
104 #define FS_BINARY_MOUNTDATA 2
105 #define FS_HAS_SUBTYPE 4
106 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
107 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
108 * during rename() internally.
112 * These are the fs-independent mount-flags: up to 32 flags are supported
114 #define MS_RDONLY 1 /* Mount read-only */
115 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
116 #define MS_NODEV 4 /* Disallow access to device special files */
117 #define MS_NOEXEC 8 /* Disallow program execution */
118 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
119 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
120 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
121 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
122 #define MS_NOATIME 1024 /* Do not update access times. */
123 #define MS_NODIRATIME 2048 /* Do not update directory access times */
127 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
128 MS_VERBOSE is deprecated. */
129 #define MS_SILENT 32768
130 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
131 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
132 #define MS_PRIVATE (1<<18) /* change to private */
133 #define MS_SLAVE (1<<19) /* change to slave */
134 #define MS_SHARED (1<<20) /* change to shared */
135 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
136 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
137 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
138 #define MS_ACTIVE (1<<30)
139 #define MS_NOUSER (1<<31)
142 * Superblock flags that can be altered by MS_REMOUNT
144 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
147 * Old magic mount flag and mask
149 #define MS_MGC_VAL 0xC0ED0000
150 #define MS_MGC_MSK 0xffff0000
152 /* Inode flags - they have nothing to superblock flags now */
154 #define S_SYNC 1 /* Writes are synced at once */
155 #define S_NOATIME 2 /* Do not update access times */
156 #define S_APPEND 4 /* Append-only file */
157 #define S_IMMUTABLE 8 /* Immutable file */
158 #define S_DEAD 16 /* removed, but still open directory */
159 #define S_NOQUOTA 32 /* Inode is not counted to quota */
160 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
161 #define S_NOCMTIME 128 /* Do not update file c/mtime */
162 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
163 #define S_PRIVATE 512 /* Inode is fs-internal */
166 * Note that nosuid etc flags are inode-specific: setting some file-system
167 * flags just means all the inodes inherit those flags by default. It might be
168 * possible to override it selectively if you really wanted to with some
169 * ioctl() that is not currently implemented.
171 * Exception: MS_RDONLY is always applied to the entire file system.
173 * Unfortunately, it is possible to change a filesystems flags with it mounted
174 * with files in use. This means that all of the inodes will not have their
175 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
176 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
178 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
180 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
181 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
182 ((inode)->i_flags & S_SYNC))
183 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
184 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
185 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
186 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
187 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
189 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
190 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
191 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
192 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
194 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
195 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
196 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
197 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
199 /* the read-only stuff doesn't really belong here, but any other place is
200 probably as bad and I don't want to create yet another include file. */
202 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
203 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
204 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
205 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
206 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
207 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
208 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
209 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
210 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
211 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
212 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
213 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
215 #define BLKPG _IO(0x12,105)/* See blkpg.h */
217 /* Some people are morons. Do not use sizeof! */
219 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
220 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
221 /* This was here just to show that the number is taken -
222 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
224 /* A jump here: 108-111 have been used for various private purposes. */
225 #define BLKBSZGET _IOR(0x12,112,size_t)
226 #define BLKBSZSET _IOW(0x12,113,size_t)
227 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
228 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
229 #define BLKTRACESTART _IO(0x12,116)
230 #define BLKTRACESTOP _IO(0x12,117)
231 #define BLKTRACETEARDOWN _IO(0x12,118)
232 #define BLKDISCARD _IO(0x12,119)
234 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
235 #define FIBMAP _IO(0x00,1) /* bmap access */
236 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
238 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
239 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
240 #define FS_IOC_GETVERSION _IOR('v', 1, long)
241 #define FS_IOC_SETVERSION _IOW('v', 2, long)
242 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
243 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
244 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
245 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
246 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
249 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
251 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
252 #define FS_UNRM_FL 0x00000002 /* Undelete */
253 #define FS_COMPR_FL 0x00000004 /* Compress file */
254 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
255 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
256 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
257 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
258 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
259 /* Reserved for compression usage... */
260 #define FS_DIRTY_FL 0x00000100
261 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
262 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
263 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
264 /* End compression flags --- maybe not all used */
265 #define FS_BTREE_FL 0x00001000 /* btree format dir */
266 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
267 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
268 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
269 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
270 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
271 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
272 #define FS_EXTENT_FL 0x00080000 /* Extents */
273 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
274 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
276 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
277 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
280 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
281 #define SYNC_FILE_RANGE_WRITE 2
282 #define SYNC_FILE_RANGE_WAIT_AFTER 4
286 #include <linux/linkage.h>
287 #include <linux/wait.h>
288 #include <linux/types.h>
289 #include <linux/kdev_t.h>
290 #include <linux/dcache.h>
291 #include <linux/path.h>
292 #include <linux/stat.h>
293 #include <linux/cache.h>
294 #include <linux/kobject.h>
295 #include <linux/list.h>
296 #include <linux/radix-tree.h>
297 #include <linux/prio_tree.h>
298 #include <linux/init.h>
299 #include <linux/pid.h>
300 #include <linux/mutex.h>
301 #include <linux/capability.h>
302 #include <linux/semaphore.h>
303 #include <linux/fiemap.h>
305 #include <asm/atomic.h>
306 #include <asm/byteorder.h>
308 struct export_operations;
313 struct pipe_inode_info;
314 struct poll_table_struct;
316 struct vm_area_struct;
319 extern void __init inode_init(void);
320 extern void __init inode_init_early(void);
321 extern void __init files_init(unsigned long);
324 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
325 struct buffer_head *bh_result, int create);
326 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
327 ssize_t bytes, void *private);
330 * Attribute flags. These should be or-ed together to figure out what
333 #define ATTR_MODE (1 << 0)
334 #define ATTR_UID (1 << 1)
335 #define ATTR_GID (1 << 2)
336 #define ATTR_SIZE (1 << 3)
337 #define ATTR_ATIME (1 << 4)
338 #define ATTR_MTIME (1 << 5)
339 #define ATTR_CTIME (1 << 6)
340 #define ATTR_ATIME_SET (1 << 7)
341 #define ATTR_MTIME_SET (1 << 8)
342 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
343 #define ATTR_ATTR_FLAG (1 << 10)
344 #define ATTR_KILL_SUID (1 << 11)
345 #define ATTR_KILL_SGID (1 << 12)
346 #define ATTR_FILE (1 << 13)
347 #define ATTR_KILL_PRIV (1 << 14)
348 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
349 #define ATTR_TIMES_SET (1 << 16)
352 * This is the Inode Attributes structure, used for notify_change(). It
353 * uses the above definitions as flags, to know which values have changed.
354 * Also, in this manner, a Filesystem can look at only the values it cares
355 * about. Basically, these are the attributes that the VFS layer can
356 * request to change from the FS layer.
358 * Derek Atkins <warlord@MIT.EDU> 94-10-20
361 unsigned int ia_valid;
366 struct timespec ia_atime;
367 struct timespec ia_mtime;
368 struct timespec ia_ctime;
371 * Not an attribute, but an auxilary info for filesystems wanting to
372 * implement an ftruncate() like method. NOTE: filesystem should
373 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
375 struct file *ia_file;
379 * Includes for diskquotas.
381 #include <linux/quota.h>
384 * enum positive_aop_returns - aop return codes with specific semantics
386 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
387 * completed, that the page is still locked, and
388 * should be considered active. The VM uses this hint
389 * to return the page to the active list -- it won't
390 * be a candidate for writeback again in the near
391 * future. Other callers must be careful to unlock
392 * the page if they get this return. Returned by
395 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
396 * unlocked it and the page might have been truncated.
397 * The caller should back up to acquiring a new page and
398 * trying again. The aop will be taking reasonable
399 * precautions not to livelock. If the caller held a page
400 * reference, it should drop it before retrying. Returned
403 * address_space_operation functions return these large constants to indicate
404 * special semantics to the caller. These are much larger than the bytes in a
405 * page to allow for functions that return the number of bytes operated on in a
409 enum positive_aop_returns {
410 AOP_WRITEPAGE_ACTIVATE = 0x80000,
411 AOP_TRUNCATED_PAGE = 0x80001,
414 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
415 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
418 * oh the beauties of C type declarations.
421 struct address_space;
422 struct writeback_control;
425 const struct iovec *iov;
426 unsigned long nr_segs;
431 size_t iov_iter_copy_from_user_atomic(struct page *page,
432 struct iov_iter *i, unsigned long offset, size_t bytes);
433 size_t iov_iter_copy_from_user(struct page *page,
434 struct iov_iter *i, unsigned long offset, size_t bytes);
435 void iov_iter_advance(struct iov_iter *i, size_t bytes);
436 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
437 size_t iov_iter_single_seg_count(struct iov_iter *i);
439 static inline void iov_iter_init(struct iov_iter *i,
440 const struct iovec *iov, unsigned long nr_segs,
441 size_t count, size_t written)
444 i->nr_segs = nr_segs;
446 i->count = count + written;
448 iov_iter_advance(i, written);
451 static inline size_t iov_iter_count(struct iov_iter *i)
457 * "descriptor" for what we're up to with a read.
458 * This allows us to use the same read code yet
459 * have multiple different users of the data that
460 * we read from a file.
462 * The simplest case just copies the data to user
475 typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
476 unsigned long, unsigned long);
478 struct address_space_operations {
479 int (*writepage)(struct page *page, struct writeback_control *wbc);
480 int (*readpage)(struct file *, struct page *);
481 void (*sync_page)(struct page *);
483 /* Write back some dirty pages from this mapping. */
484 int (*writepages)(struct address_space *, struct writeback_control *);
486 /* Set a page dirty. Return true if this dirtied it */
487 int (*set_page_dirty)(struct page *page);
489 int (*readpages)(struct file *filp, struct address_space *mapping,
490 struct list_head *pages, unsigned nr_pages);
493 * ext3 requires that a successful prepare_write() call be followed
494 * by a commit_write() call - they must be balanced
496 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
497 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
499 int (*write_begin)(struct file *, struct address_space *mapping,
500 loff_t pos, unsigned len, unsigned flags,
501 struct page **pagep, void **fsdata);
502 int (*write_end)(struct file *, struct address_space *mapping,
503 loff_t pos, unsigned len, unsigned copied,
504 struct page *page, void *fsdata);
506 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
507 sector_t (*bmap)(struct address_space *, sector_t);
508 void (*invalidatepage) (struct page *, unsigned long);
509 int (*releasepage) (struct page *, gfp_t);
510 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
511 loff_t offset, unsigned long nr_segs);
512 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
513 void **, unsigned long *);
514 /* migrate the contents of a page to the specified target */
515 int (*migratepage) (struct address_space *,
516 struct page *, struct page *);
517 int (*launder_page) (struct page *);
518 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
523 * pagecache_write_begin/pagecache_write_end must be used by general code
524 * to write into the pagecache.
526 int pagecache_write_begin(struct file *, struct address_space *mapping,
527 loff_t pos, unsigned len, unsigned flags,
528 struct page **pagep, void **fsdata);
530 int pagecache_write_end(struct file *, struct address_space *mapping,
531 loff_t pos, unsigned len, unsigned copied,
532 struct page *page, void *fsdata);
534 struct backing_dev_info;
535 struct address_space {
536 struct inode *host; /* owner: inode, block_device */
537 struct radix_tree_root page_tree; /* radix tree of all pages */
538 spinlock_t tree_lock; /* and lock protecting it */
539 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
540 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
541 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
542 spinlock_t i_mmap_lock; /* protect tree, count, list */
543 unsigned int truncate_count; /* Cover race condition with truncate */
544 unsigned long nrpages; /* number of total pages */
545 pgoff_t writeback_index;/* writeback starts here */
546 const struct address_space_operations *a_ops; /* methods */
547 unsigned long flags; /* error bits/gfp mask */
548 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
549 spinlock_t private_lock; /* for use by the address_space */
550 struct list_head private_list; /* ditto */
551 struct address_space *assoc_mapping; /* ditto */
552 } __attribute__((aligned(sizeof(long))));
554 * On most architectures that alignment is already the case; but
555 * must be enforced here for CRIS, to let the least signficant bit
556 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
559 struct block_device {
560 dev_t bd_dev; /* not a kdev_t - it's a search key */
561 struct inode * bd_inode; /* will die */
563 struct mutex bd_mutex; /* open/close mutex */
564 struct semaphore bd_mount_sem;
565 struct list_head bd_inodes;
569 struct list_head bd_holder_list;
571 struct block_device * bd_contains;
572 unsigned bd_block_size;
573 struct hd_struct * bd_part;
574 /* number of times partitions within this device have been opened. */
575 unsigned bd_part_count;
577 struct gendisk * bd_disk;
578 struct list_head bd_list;
579 struct backing_dev_info *bd_inode_backing_dev_info;
581 * Private data. You must have bd_claim'ed the block_device
582 * to use this. NOTE: bd_claim allows an owner to claim
583 * the same device multiple times, the owner must take special
584 * care to not mess up bd_private for that case.
586 unsigned long bd_private;
590 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
593 #define PAGECACHE_TAG_DIRTY 0
594 #define PAGECACHE_TAG_WRITEBACK 1
596 int mapping_tagged(struct address_space *mapping, int tag);
599 * Might pages of this file be mapped into userspace?
601 static inline int mapping_mapped(struct address_space *mapping)
603 return !prio_tree_empty(&mapping->i_mmap) ||
604 !list_empty(&mapping->i_mmap_nonlinear);
608 * Might pages of this file have been modified in userspace?
609 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
610 * marks vma as VM_SHARED if it is shared, and the file was opened for
611 * writing i.e. vma may be mprotected writable even if now readonly.
613 static inline int mapping_writably_mapped(struct address_space *mapping)
615 return mapping->i_mmap_writable != 0;
619 * Use sequence counter to get consistent i_size on 32-bit processors.
621 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
622 #include <linux/seqlock.h>
623 #define __NEED_I_SIZE_ORDERED
624 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
626 #define i_size_ordered_init(inode) do { } while (0)
630 struct hlist_node i_hash;
631 struct list_head i_list;
632 struct list_head i_sb_list;
633 struct list_head i_dentry;
636 unsigned int i_nlink;
642 #ifdef __NEED_I_SIZE_ORDERED
643 seqcount_t i_size_seqcount;
645 struct timespec i_atime;
646 struct timespec i_mtime;
647 struct timespec i_ctime;
648 unsigned int i_blkbits;
650 unsigned short i_bytes;
652 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
653 struct mutex i_mutex;
654 struct rw_semaphore i_alloc_sem;
655 const struct inode_operations *i_op;
656 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
657 struct super_block *i_sb;
658 struct file_lock *i_flock;
659 struct address_space *i_mapping;
660 struct address_space i_data;
662 struct dquot *i_dquot[MAXQUOTAS];
664 struct list_head i_devices;
666 struct pipe_inode_info *i_pipe;
667 struct block_device *i_bdev;
674 #ifdef CONFIG_DNOTIFY
675 unsigned long i_dnotify_mask; /* Directory notify events */
676 struct dnotify_struct *i_dnotify; /* for directory notifications */
679 #ifdef CONFIG_INOTIFY
680 struct list_head inotify_watches; /* watches on this inode */
681 struct mutex inotify_mutex; /* protects the watches list */
684 unsigned long i_state;
685 unsigned long dirtied_when; /* jiffies of first dirtying */
687 unsigned int i_flags;
689 atomic_t i_writecount;
690 #ifdef CONFIG_SECURITY
693 void *i_private; /* fs or device private pointer */
697 * inode->i_mutex nesting subclasses for the lock validator:
699 * 0: the object of the current VFS operation
704 * The locking order between these classes is
705 * parent -> child -> normal -> xattr -> quota
707 enum inode_i_mutex_lock_class
716 extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
717 extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
720 * NOTE: in a 32bit arch with a preemptable kernel and
721 * an UP compile the i_size_read/write must be atomic
722 * with respect to the local cpu (unlike with preempt disabled),
723 * but they don't need to be atomic with respect to other cpus like in
724 * true SMP (so they need either to either locally disable irq around
725 * the read or for example on x86 they can be still implemented as a
726 * cmpxchg8b without the need of the lock prefix). For SMP compiles
727 * and 64bit archs it makes no difference if preempt is enabled or not.
729 static inline loff_t i_size_read(const struct inode *inode)
731 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
736 seq = read_seqcount_begin(&inode->i_size_seqcount);
737 i_size = inode->i_size;
738 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
740 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
744 i_size = inode->i_size;
748 return inode->i_size;
753 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
754 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
755 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
757 static inline void i_size_write(struct inode *inode, loff_t i_size)
759 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
760 write_seqcount_begin(&inode->i_size_seqcount);
761 inode->i_size = i_size;
762 write_seqcount_end(&inode->i_size_seqcount);
763 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
765 inode->i_size = i_size;
768 inode->i_size = i_size;
772 static inline unsigned iminor(const struct inode *inode)
774 return MINOR(inode->i_rdev);
777 static inline unsigned imajor(const struct inode *inode)
779 return MAJOR(inode->i_rdev);
782 extern struct block_device *I_BDEV(struct inode *inode);
785 rwlock_t lock; /* protects pid, uid, euid fields */
786 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
787 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
788 uid_t uid, euid; /* uid/euid of process setting the owner */
789 int signum; /* posix.1b rt signal to be delivered on IO */
793 * Track a single file's readahead state
795 struct file_ra_state {
796 pgoff_t start; /* where readahead started */
797 unsigned int size; /* # of readahead pages */
798 unsigned int async_size; /* do asynchronous readahead when
799 there are only # of pages ahead */
801 unsigned int ra_pages; /* Maximum readahead window */
802 int mmap_miss; /* Cache miss stat for mmap accesses */
803 loff_t prev_pos; /* Cache last read() position */
807 * Check if @index falls in the readahead windows.
809 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
811 return (index >= ra->start &&
812 index < ra->start + ra->size);
815 #define FILE_MNT_WRITE_TAKEN 1
816 #define FILE_MNT_WRITE_RELEASED 2
820 * fu_list becomes invalid after file_free is called and queued via
821 * fu_rcuhead for RCU freeing
824 struct list_head fu_list;
825 struct rcu_head fu_rcuhead;
828 #define f_dentry f_path.dentry
829 #define f_vfsmnt f_path.mnt
830 const struct file_operations *f_op;
831 atomic_long_t f_count;
832 unsigned int f_flags;
835 struct fown_struct f_owner;
836 unsigned int f_uid, f_gid;
837 struct file_ra_state f_ra;
840 #ifdef CONFIG_SECURITY
843 /* needed for tty driver, and maybe others */
847 /* Used by fs/eventpoll.c to link all the hooks to this file */
848 struct list_head f_ep_links;
849 spinlock_t f_ep_lock;
850 #endif /* #ifdef CONFIG_EPOLL */
851 struct address_space *f_mapping;
852 #ifdef CONFIG_DEBUG_WRITECOUNT
853 unsigned long f_mnt_write_state;
856 extern spinlock_t files_lock;
857 #define file_list_lock() spin_lock(&files_lock);
858 #define file_list_unlock() spin_unlock(&files_lock);
860 #define get_file(x) atomic_long_inc(&(x)->f_count)
861 #define file_count(x) atomic_long_read(&(x)->f_count)
863 #ifdef CONFIG_DEBUG_WRITECOUNT
864 static inline void file_take_write(struct file *f)
866 WARN_ON(f->f_mnt_write_state != 0);
867 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
869 static inline void file_release_write(struct file *f)
871 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
873 static inline void file_reset_write(struct file *f)
875 f->f_mnt_write_state = 0;
877 static inline void file_check_state(struct file *f)
880 * At this point, either both or neither of these bits
883 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
884 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
886 static inline int file_check_writeable(struct file *f)
888 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
890 printk(KERN_WARNING "writeable file with no "
891 "mnt_want_write()\n");
895 #else /* !CONFIG_DEBUG_WRITECOUNT */
896 static inline void file_take_write(struct file *filp) {}
897 static inline void file_release_write(struct file *filp) {}
898 static inline void file_reset_write(struct file *filp) {}
899 static inline void file_check_state(struct file *filp) {}
900 static inline int file_check_writeable(struct file *filp)
904 #endif /* CONFIG_DEBUG_WRITECOUNT */
906 #define MAX_NON_LFS ((1UL<<31) - 1)
908 /* Page cache limit. The filesystems should put that into their s_maxbytes
909 limits, otherwise bad things can happen in VM. */
910 #if BITS_PER_LONG==32
911 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
912 #elif BITS_PER_LONG==64
913 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
918 #define FL_ACCESS 8 /* not trying to lock, just looking */
919 #define FL_EXISTS 16 /* when unlocking, test for existence */
920 #define FL_LEASE 32 /* lease held on this file */
921 #define FL_CLOSE 64 /* unlock on close */
922 #define FL_SLEEP 128 /* A blocking lock */
925 * Special return value from posix_lock_file() and vfs_lock_file() for
926 * asynchronous locking.
928 #define FILE_LOCK_DEFERRED 1
931 * The POSIX file lock owner is determined by
932 * the "struct files_struct" in the thread group
933 * (or NULL for no owner - BSD locks).
935 * Lockd stuffs a "host" pointer into this.
937 typedef struct files_struct *fl_owner_t;
939 struct file_lock_operations {
940 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
941 void (*fl_release_private)(struct file_lock *);
944 struct lock_manager_operations {
945 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
946 void (*fl_notify)(struct file_lock *); /* unblock callback */
947 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
948 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
949 void (*fl_release_private)(struct file_lock *);
950 void (*fl_break)(struct file_lock *);
951 int (*fl_mylease)(struct file_lock *, struct file_lock *);
952 int (*fl_change)(struct file_lock **, int);
955 struct lock_manager {
956 struct list_head list;
959 void locks_start_grace(struct lock_manager *);
960 void locks_end_grace(struct lock_manager *);
961 int locks_in_grace(void);
963 /* that will die - we need it for nfs_lock_info */
964 #include <linux/nfs_fs_i.h>
967 struct file_lock *fl_next; /* singly linked list for this inode */
968 struct list_head fl_link; /* doubly linked list of all locks */
969 struct list_head fl_block; /* circular list of blocked processes */
971 unsigned char fl_flags;
972 unsigned char fl_type;
974 struct pid *fl_nspid;
975 wait_queue_head_t fl_wait;
976 struct file *fl_file;
980 struct fasync_struct * fl_fasync; /* for lease break notifications */
981 unsigned long fl_break_time; /* for nonblocking lease breaks */
983 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
984 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
986 struct nfs_lock_info nfs_fl;
987 struct nfs4_lock_info nfs4_fl;
989 struct list_head link; /* link in AFS vnode's pending_locks list */
990 int state; /* state of grant or error if -ve */
995 /* The following constant reflects the upper bound of the file/locking space */
997 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
998 #define OFFSET_MAX INT_LIMIT(loff_t)
999 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1002 #include <linux/fcntl.h>
1004 extern void send_sigio(struct fown_struct *fown, int fd, int band);
1007 extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
1008 loff_t endbyte, unsigned int flags);
1010 #ifdef CONFIG_FILE_LOCKING
1011 extern int fcntl_getlk(struct file *, struct flock __user *);
1012 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1013 struct flock __user *);
1015 #if BITS_PER_LONG == 32
1016 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
1017 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1018 struct flock64 __user *);
1021 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1022 extern int fcntl_getlease(struct file *filp);
1025 extern void locks_init_lock(struct file_lock *);
1026 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1027 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
1028 extern void locks_remove_posix(struct file *, fl_owner_t);
1029 extern void locks_remove_flock(struct file *);
1030 extern void posix_test_lock(struct file *, struct file_lock *);
1031 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1032 extern int posix_lock_file_wait(struct file *, struct file_lock *);
1033 extern int posix_unblock_lock(struct file *, struct file_lock *);
1034 extern int vfs_test_lock(struct file *, struct file_lock *);
1035 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
1036 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1037 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1038 extern int __break_lease(struct inode *inode, unsigned int flags);
1039 extern void lease_get_mtime(struct inode *, struct timespec *time);
1040 extern int generic_setlease(struct file *, long, struct file_lock **);
1041 extern int vfs_setlease(struct file *, long, struct file_lock **);
1042 extern int lease_modify(struct file_lock **, int);
1043 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1044 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
1045 extern struct seq_operations locks_seq_operations;
1046 #else /* !CONFIG_FILE_LOCKING */
1047 #define fcntl_getlk(a, b) ({ -EINVAL; })
1048 #define fcntl_setlk(a, b, c, d) ({ -EACCES; })
1049 #if BITS_PER_LONG == 32
1050 #define fcntl_getlk64(a, b) ({ -EINVAL; })
1051 #define fcntl_setlk64(a, b, c, d) ({ -EACCES; })
1053 #define fcntl_setlease(a, b, c) ({ 0; })
1054 #define fcntl_getlease(a) ({ 0; })
1055 #define locks_init_lock(a) ({ })
1056 #define __locks_copy_lock(a, b) ({ })
1057 #define locks_copy_lock(a, b) ({ })
1058 #define locks_remove_posix(a, b) ({ })
1059 #define locks_remove_flock(a) ({ })
1060 #define posix_test_lock(a, b) ({ 0; })
1061 #define posix_lock_file(a, b, c) ({ -ENOLCK; })
1062 #define posix_lock_file_wait(a, b) ({ -ENOLCK; })
1063 #define posix_unblock_lock(a, b) (-ENOENT)
1064 #define vfs_test_lock(a, b) ({ 0; })
1065 #define vfs_lock_file(a, b, c, d) (-ENOLCK)
1066 #define vfs_cancel_lock(a, b) ({ 0; })
1067 #define flock_lock_file_wait(a, b) ({ -ENOLCK; })
1068 #define __break_lease(a, b) ({ 0; })
1069 #define lease_get_mtime(a, b) ({ })
1070 #define generic_setlease(a, b, c) ({ -EINVAL; })
1071 #define vfs_setlease(a, b, c) ({ -EINVAL; })
1072 #define lease_modify(a, b) ({ -EINVAL; })
1073 #define lock_may_read(a, b, c) ({ 1; })
1074 #define lock_may_write(a, b, c) ({ 1; })
1075 #endif /* !CONFIG_FILE_LOCKING */
1078 struct fasync_struct {
1081 struct fasync_struct *fa_next; /* singly linked list */
1082 struct file *fa_file;
1085 #define FASYNC_MAGIC 0x4601
1087 /* SMP safe fasync helpers: */
1088 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1089 /* can be called from interrupts */
1090 extern void kill_fasync(struct fasync_struct **, int, int);
1091 /* only for net: no internal synchronization */
1092 extern void __kill_fasync(struct fasync_struct *, int, int);
1094 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1095 extern int f_setown(struct file *filp, unsigned long arg, int force);
1096 extern void f_delown(struct file *filp);
1097 extern pid_t f_getown(struct file *filp);
1098 extern int send_sigurg(struct fown_struct *fown);
1104 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1105 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1106 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1108 extern struct list_head super_blocks;
1109 extern spinlock_t sb_lock;
1111 #define sb_entry(list) list_entry((list), struct super_block, s_list)
1112 #define S_BIAS (1<<30)
1113 struct super_block {
1114 struct list_head s_list; /* Keep this first */
1115 dev_t s_dev; /* search index; _not_ kdev_t */
1116 unsigned long s_blocksize;
1117 unsigned char s_blocksize_bits;
1118 unsigned char s_dirt;
1119 unsigned long long s_maxbytes; /* Max file size */
1120 struct file_system_type *s_type;
1121 const struct super_operations *s_op;
1122 struct dquot_operations *dq_op;
1123 struct quotactl_ops *s_qcop;
1124 const struct export_operations *s_export_op;
1125 unsigned long s_flags;
1126 unsigned long s_magic;
1127 struct dentry *s_root;
1128 struct rw_semaphore s_umount;
1129 struct mutex s_lock;
1134 #ifdef CONFIG_SECURITY
1137 struct xattr_handler **s_xattr;
1139 struct list_head s_inodes; /* all inodes */
1140 struct list_head s_dirty; /* dirty inodes */
1141 struct list_head s_io; /* parked for writeback */
1142 struct list_head s_more_io; /* parked for more writeback */
1143 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1144 struct list_head s_files;
1145 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1146 struct list_head s_dentry_lru; /* unused dentry lru */
1147 int s_nr_dentry_unused; /* # of dentry on lru */
1149 struct block_device *s_bdev;
1150 struct mtd_info *s_mtd;
1151 struct list_head s_instances;
1152 struct quota_info s_dquot; /* Diskquota specific options */
1155 wait_queue_head_t s_wait_unfrozen;
1157 char s_id[32]; /* Informational name */
1159 void *s_fs_info; /* Filesystem private info */
1163 * The next field is for VFS *only*. No filesystems have any business
1164 * even looking at it. You had been warned.
1166 struct mutex s_vfs_rename_mutex; /* Kludge */
1168 /* Granularity of c/m/atime in ns.
1169 Cannot be worse than a second */
1173 * Filesystem subtype. If non-empty the filesystem type field
1174 * in /proc/mounts will be "type.subtype"
1179 * Saved mount options for lazy filesystems using
1180 * generic_show_options()
1185 extern struct timespec current_fs_time(struct super_block *sb);
1188 * Snapshotting support.
1192 SB_FREEZE_WRITE = 1,
1193 SB_FREEZE_TRANS = 2,
1196 #define vfs_check_frozen(sb, level) \
1197 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1199 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1200 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1201 #define has_fs_excl() atomic_read(¤t->fs_excl)
1203 #define is_owner_or_cap(inode) \
1204 ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
1206 /* not quite ready to be deprecated, but... */
1207 extern void lock_super(struct super_block *);
1208 extern void unlock_super(struct super_block *);
1211 * VFS helper functions..
1213 extern int vfs_permission(struct nameidata *, int);
1214 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1215 extern int vfs_mkdir(struct inode *, struct dentry *, int);
1216 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
1217 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
1218 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1219 extern int vfs_rmdir(struct inode *, struct dentry *);
1220 extern int vfs_unlink(struct inode *, struct dentry *);
1221 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1224 * VFS dentry helper functions.
1226 extern void dentry_unhash(struct dentry *dentry);
1229 * VFS file helper functions.
1231 extern int file_permission(struct file *, int);
1234 * VFS FS_IOC_FIEMAP helper definitions.
1236 struct fiemap_extent_info {
1237 unsigned int fi_flags; /* Flags as passed from user */
1238 unsigned int fi_extents_mapped; /* Number of mapped extents */
1239 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1240 struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent
1243 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1244 u64 phys, u64 len, u32 flags);
1245 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1250 * NOTE! These match bits 12..15 of stat.st_mode
1251 * (ie "(i_mode >> 12) & 15").
1253 #define DT_UNKNOWN 0
1263 #define OSYNC_METADATA (1<<0)
1264 #define OSYNC_DATA (1<<1)
1265 #define OSYNC_INODE (1<<2)
1266 int generic_osync_inode(struct inode *, struct address_space *, int);
1269 * This is the "filldir" function type, used by readdir() to let
1270 * the kernel specify what kind of dirent layout it wants to have.
1271 * This allows the kernel to read directories into kernel space or
1272 * to have different dirent layouts depending on the binary type.
1274 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1275 struct block_device_operations;
1277 /* These macros are for out of kernel modules to test that
1278 * the kernel supports the unlocked_ioctl and compat_ioctl
1279 * fields in struct file_operations. */
1280 #define HAVE_COMPAT_IOCTL 1
1281 #define HAVE_UNLOCKED_IOCTL 1
1285 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1286 * can be called without the big kernel lock held in all filesystems.
1288 struct file_operations {
1289 struct module *owner;
1290 loff_t (*llseek) (struct file *, loff_t, int);
1291 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1292 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1293 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1294 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1295 int (*readdir) (struct file *, void *, filldir_t);
1296 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1297 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1298 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1299 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1300 int (*mmap) (struct file *, struct vm_area_struct *);
1301 int (*open) (struct inode *, struct file *);
1302 int (*flush) (struct file *, fl_owner_t id);
1303 int (*release) (struct inode *, struct file *);
1304 int (*fsync) (struct file *, struct dentry *, int datasync);
1305 int (*aio_fsync) (struct kiocb *, int datasync);
1306 int (*fasync) (int, struct file *, int);
1307 int (*lock) (struct file *, int, struct file_lock *);
1308 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1309 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1310 int (*check_flags)(int);
1311 int (*dir_notify)(struct file *filp, unsigned long arg);
1312 int (*flock) (struct file *, int, struct file_lock *);
1313 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1314 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1315 int (*setlease)(struct file *, long, struct file_lock **);
1318 struct inode_operations {
1319 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1320 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1321 int (*link) (struct dentry *,struct inode *,struct dentry *);
1322 int (*unlink) (struct inode *,struct dentry *);
1323 int (*symlink) (struct inode *,struct dentry *,const char *);
1324 int (*mkdir) (struct inode *,struct dentry *,int);
1325 int (*rmdir) (struct inode *,struct dentry *);
1326 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1327 int (*rename) (struct inode *, struct dentry *,
1328 struct inode *, struct dentry *);
1329 int (*readlink) (struct dentry *, char __user *,int);
1330 void * (*follow_link) (struct dentry *, struct nameidata *);
1331 void (*put_link) (struct dentry *, struct nameidata *, void *);
1332 void (*truncate) (struct inode *);
1333 int (*permission) (struct inode *, int);
1334 int (*setattr) (struct dentry *, struct iattr *);
1335 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1336 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1337 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1338 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1339 int (*removexattr) (struct dentry *, const char *);
1340 void (*truncate_range)(struct inode *, loff_t, loff_t);
1341 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1343 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1349 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1350 unsigned long nr_segs, unsigned long fast_segs,
1351 struct iovec *fast_pointer,
1352 struct iovec **ret_pointer);
1354 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1355 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1356 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1357 unsigned long, loff_t *);
1358 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1359 unsigned long, loff_t *);
1361 struct super_operations {
1362 struct inode *(*alloc_inode)(struct super_block *sb);
1363 void (*destroy_inode)(struct inode *);
1365 void (*dirty_inode) (struct inode *);
1366 int (*write_inode) (struct inode *, int);
1367 void (*drop_inode) (struct inode *);
1368 void (*delete_inode) (struct inode *);
1369 void (*put_super) (struct super_block *);
1370 void (*write_super) (struct super_block *);
1371 int (*sync_fs)(struct super_block *sb, int wait);
1372 void (*write_super_lockfs) (struct super_block *);
1373 void (*unlockfs) (struct super_block *);
1374 int (*statfs) (struct dentry *, struct kstatfs *);
1375 int (*remount_fs) (struct super_block *, int *, char *);
1376 void (*clear_inode) (struct inode *);
1377 void (*umount_begin) (struct super_block *);
1379 int (*show_options)(struct seq_file *, struct vfsmount *);
1380 int (*show_stats)(struct seq_file *, struct vfsmount *);
1382 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1383 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1388 * Inode state bits. Protected by inode_lock.
1390 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1391 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1393 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1394 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1395 * various stages of removing an inode.
1397 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1399 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1400 * fdatasync(). i_atime is the usual cause.
1401 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1402 * these changes separately from I_DIRTY_SYNC so that we
1403 * don't have to write inode on fdatasync() when only
1404 * mtime has changed in it.
1405 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1406 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1407 * are cleared by unlock_new_inode(), called from iget().
1408 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1409 * is zero. I_FREEING must be set when I_WILL_FREE is
1411 * I_FREEING Set when inode is about to be freed but still has dirty
1412 * pages or buffers attached or the inode itself is still
1414 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1415 * and can be destroyed.
1417 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1418 * prohibited for many purposes. iget() must wait for
1419 * the inode to be completely released, then create it
1420 * anew. Other functions will just ignore such inodes,
1421 * if appropriate. I_LOCK is used for waiting.
1423 * I_LOCK Serves as both a mutex and completion notification.
1424 * New inodes set I_LOCK. If two processes both create
1425 * the same inode, one of them will release its inode and
1426 * wait for I_LOCK to be released before returning.
1427 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1428 * also cause waiting on I_LOCK, without I_LOCK actually
1429 * being set. find_inode() uses this to prevent returning
1430 * nearly-dead inodes.
1431 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
1432 * of inode dirty data. Having a separate lock for this
1433 * purpose reduces latency and prevents some filesystem-
1434 * specific deadlocks.
1436 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1437 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1438 * I_CLEAR? If not, why?
1440 #define I_DIRTY_SYNC 1
1441 #define I_DIRTY_DATASYNC 2
1442 #define I_DIRTY_PAGES 4
1444 #define I_WILL_FREE 16
1445 #define I_FREEING 32
1448 #define I_LOCK (1 << __I_LOCK)
1450 #define I_SYNC (1 << __I_SYNC)
1452 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1454 extern void __mark_inode_dirty(struct inode *, int);
1455 static inline void mark_inode_dirty(struct inode *inode)
1457 __mark_inode_dirty(inode, I_DIRTY);
1460 static inline void mark_inode_dirty_sync(struct inode *inode)
1462 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1466 * inc_nlink - directly increment an inode's link count
1469 * This is a low-level filesystem helper to replace any
1470 * direct filesystem manipulation of i_nlink. Currently,
1471 * it is only here for parity with dec_nlink().
1473 static inline void inc_nlink(struct inode *inode)
1478 static inline void inode_inc_link_count(struct inode *inode)
1481 mark_inode_dirty(inode);
1485 * drop_nlink - directly drop an inode's link count
1488 * This is a low-level filesystem helper to replace any
1489 * direct filesystem manipulation of i_nlink. In cases
1490 * where we are attempting to track writes to the
1491 * filesystem, a decrement to zero means an imminent
1492 * write when the file is truncated and actually unlinked
1493 * on the filesystem.
1495 static inline void drop_nlink(struct inode *inode)
1501 * clear_nlink - directly zero an inode's link count
1504 * This is a low-level filesystem helper to replace any
1505 * direct filesystem manipulation of i_nlink. See
1506 * drop_nlink() for why we care about i_nlink hitting zero.
1508 static inline void clear_nlink(struct inode *inode)
1513 static inline void inode_dec_link_count(struct inode *inode)
1516 mark_inode_dirty(inode);
1520 * inode_inc_iversion - increments i_version
1521 * @inode: inode that need to be updated
1523 * Every time the inode is modified, the i_version field will be incremented.
1524 * The filesystem has to be mounted with i_version flag
1527 static inline void inode_inc_iversion(struct inode *inode)
1529 spin_lock(&inode->i_lock);
1531 spin_unlock(&inode->i_lock);
1534 extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
1535 static inline void file_accessed(struct file *file)
1537 if (!(file->f_flags & O_NOATIME))
1538 touch_atime(file->f_path.mnt, file->f_path.dentry);
1541 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1543 struct file_system_type {
1546 int (*get_sb) (struct file_system_type *, int,
1547 const char *, void *, struct vfsmount *);
1548 void (*kill_sb) (struct super_block *);
1549 struct module *owner;
1550 struct file_system_type * next;
1551 struct list_head fs_supers;
1553 struct lock_class_key s_lock_key;
1554 struct lock_class_key s_umount_key;
1556 struct lock_class_key i_lock_key;
1557 struct lock_class_key i_mutex_key;
1558 struct lock_class_key i_mutex_dir_key;
1559 struct lock_class_key i_alloc_sem_key;
1562 extern int get_sb_bdev(struct file_system_type *fs_type,
1563 int flags, const char *dev_name, void *data,
1564 int (*fill_super)(struct super_block *, void *, int),
1565 struct vfsmount *mnt);
1566 extern int get_sb_single(struct file_system_type *fs_type,
1567 int flags, void *data,
1568 int (*fill_super)(struct super_block *, void *, int),
1569 struct vfsmount *mnt);
1570 extern int get_sb_nodev(struct file_system_type *fs_type,
1571 int flags, void *data,
1572 int (*fill_super)(struct super_block *, void *, int),
1573 struct vfsmount *mnt);
1574 void generic_shutdown_super(struct super_block *sb);
1575 void kill_block_super(struct super_block *sb);
1576 void kill_anon_super(struct super_block *sb);
1577 void kill_litter_super(struct super_block *sb);
1578 void deactivate_super(struct super_block *sb);
1579 int set_anon_super(struct super_block *s, void *data);
1580 struct super_block *sget(struct file_system_type *type,
1581 int (*test)(struct super_block *,void *),
1582 int (*set)(struct super_block *,void *),
1584 extern int get_sb_pseudo(struct file_system_type *, char *,
1585 const struct super_operations *ops, unsigned long,
1586 struct vfsmount *mnt);
1587 extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
1588 int __put_super_and_need_restart(struct super_block *sb);
1590 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1591 #define fops_get(fops) \
1592 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1593 #define fops_put(fops) \
1594 do { if (fops) module_put((fops)->owner); } while(0)
1596 extern int register_filesystem(struct file_system_type *);
1597 extern int unregister_filesystem(struct file_system_type *);
1598 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1599 #define kern_mount(type) kern_mount_data(type, NULL)
1600 extern int may_umount_tree(struct vfsmount *);
1601 extern int may_umount(struct vfsmount *);
1602 extern long do_mount(char *, char *, char *, unsigned long, void *);
1603 extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *);
1604 extern void drop_collected_mounts(struct vfsmount *);
1606 extern int vfs_statfs(struct dentry *, struct kstatfs *);
1609 extern struct kobject *fs_kobj;
1611 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1613 #define FLOCK_VERIFY_READ 1
1614 #define FLOCK_VERIFY_WRITE 2
1616 #ifdef CONFIG_FILE_LOCKING
1617 extern int locks_mandatory_locked(struct inode *);
1618 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1621 * Candidates for mandatory locking have the setgid bit set
1622 * but no group execute bit - an otherwise meaningless combination.
1625 static inline int __mandatory_lock(struct inode *ino)
1627 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1631 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1632 * otherwise these will be advisory locks
1635 static inline int mandatory_lock(struct inode *ino)
1637 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1640 static inline int locks_verify_locked(struct inode *inode)
1642 if (mandatory_lock(inode))
1643 return locks_mandatory_locked(inode);
1647 static inline int locks_verify_truncate(struct inode *inode,
1651 if (inode->i_flock && mandatory_lock(inode))
1652 return locks_mandatory_area(
1653 FLOCK_VERIFY_WRITE, inode, filp,
1654 size < inode->i_size ? size : inode->i_size,
1655 (size < inode->i_size ? inode->i_size - size
1656 : size - inode->i_size)
1661 static inline int break_lease(struct inode *inode, unsigned int mode)
1664 return __break_lease(inode, mode);
1667 #else /* !CONFIG_FILE_LOCKING */
1668 #define locks_mandatory_locked(a) ({ 0; })
1669 #define locks_mandatory_area(a, b, c, d, e) ({ 0; })
1670 #define __mandatory_lock(a) ({ 0; })
1671 #define mandatory_lock(a) ({ 0; })
1672 #define locks_verify_locked(a) ({ 0; })
1673 #define locks_verify_truncate(a, b, c) ({ 0; })
1674 #define break_lease(a, b) ({ 0; })
1675 #endif /* CONFIG_FILE_LOCKING */
1679 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1681 extern long do_sys_open(int dfd, const char __user *filename, int flags,
1683 extern struct file *filp_open(const char *, int, int);
1684 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1685 extern int filp_close(struct file *, fl_owner_t id);
1686 extern char * getname(const char __user *);
1689 extern void __init vfs_caches_init_early(void);
1690 extern void __init vfs_caches_init(unsigned long);
1692 extern struct kmem_cache *names_cachep;
1694 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
1695 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1696 #ifndef CONFIG_AUDITSYSCALL
1697 #define putname(name) __putname(name)
1699 extern void putname(const char *name);
1703 extern int register_blkdev(unsigned int, const char *);
1704 extern void unregister_blkdev(unsigned int, const char *);
1705 extern struct block_device *bdget(dev_t);
1706 extern void bd_set_size(struct block_device *, loff_t size);
1707 extern void bd_forget(struct inode *inode);
1708 extern void bdput(struct block_device *);
1709 extern struct block_device *open_by_devnum(dev_t, fmode_t);
1711 static inline void bd_forget(struct inode *inode) {}
1713 extern const struct file_operations def_blk_fops;
1714 extern const struct file_operations def_chr_fops;
1715 extern const struct file_operations bad_sock_fops;
1716 extern const struct file_operations def_fifo_fops;
1718 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1719 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
1720 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1721 extern int blkdev_get(struct block_device *, fmode_t);
1722 extern int blkdev_put(struct block_device *, fmode_t);
1723 extern int bd_claim(struct block_device *, void *);
1724 extern void bd_release(struct block_device *);
1726 extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1727 extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1729 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1730 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1735 #define CHRDEV_MAJOR_HASH_SIZE 255
1736 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1737 extern int register_chrdev_region(dev_t, unsigned, const char *);
1738 extern int register_chrdev(unsigned int, const char *,
1739 const struct file_operations *);
1740 extern void unregister_chrdev(unsigned int, const char *);
1741 extern void unregister_chrdev_region(dev_t, unsigned);
1742 extern void chrdev_show(struct seq_file *,off_t);
1744 /* fs/block_dev.c */
1745 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1746 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1749 #define BLKDEV_MAJOR_HASH_SIZE 255
1750 extern const char *__bdevname(dev_t, char *buffer);
1751 extern const char *bdevname(struct block_device *bdev, char *buffer);
1752 extern struct block_device *lookup_bdev(const char *);
1753 extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
1754 extern void close_bdev_exclusive(struct block_device *, fmode_t);
1755 extern void blkdev_show(struct seq_file *,off_t);
1758 #define BLKDEV_MAJOR_HASH_SIZE 0
1761 extern void init_special_inode(struct inode *, umode_t, dev_t);
1763 /* Invalid inode operations -- fs/bad_inode.c */
1764 extern void make_bad_inode(struct inode *);
1765 extern int is_bad_inode(struct inode *);
1767 extern const struct file_operations read_pipefifo_fops;
1768 extern const struct file_operations write_pipefifo_fops;
1769 extern const struct file_operations rdwr_pipefifo_fops;
1771 extern int fs_may_remount_ro(struct super_block *);
1775 * return READ, READA, or WRITE
1777 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1780 * return data direction, READ or WRITE
1782 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1784 extern void check_disk_size_change(struct gendisk *disk,
1785 struct block_device *bdev);
1786 extern int revalidate_disk(struct gendisk *);
1787 extern int check_disk_change(struct block_device *);
1788 extern int __invalidate_device(struct block_device *);
1789 extern int invalidate_partition(struct gendisk *, int);
1791 extern int invalidate_inodes(struct super_block *);
1792 unsigned long __invalidate_mapping_pages(struct address_space *mapping,
1793 pgoff_t start, pgoff_t end,
1795 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1796 pgoff_t start, pgoff_t end);
1798 static inline unsigned long __deprecated
1799 invalidate_inode_pages(struct address_space *mapping)
1801 return invalidate_mapping_pages(mapping, 0, ~0UL);
1804 static inline void invalidate_remote_inode(struct inode *inode)
1806 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1807 S_ISLNK(inode->i_mode))
1808 invalidate_mapping_pages(inode->i_mapping, 0, -1);
1810 extern int invalidate_inode_pages2(struct address_space *mapping);
1811 extern int invalidate_inode_pages2_range(struct address_space *mapping,
1812 pgoff_t start, pgoff_t end);
1813 extern void generic_sync_sb_inodes(struct super_block *sb,
1814 struct writeback_control *wbc);
1815 extern int write_inode_now(struct inode *, int);
1816 extern int filemap_fdatawrite(struct address_space *);
1817 extern int filemap_flush(struct address_space *);
1818 extern int filemap_fdatawait(struct address_space *);
1819 extern int filemap_write_and_wait(struct address_space *mapping);
1820 extern int filemap_write_and_wait_range(struct address_space *mapping,
1821 loff_t lstart, loff_t lend);
1822 extern int wait_on_page_writeback_range(struct address_space *mapping,
1823 pgoff_t start, pgoff_t end);
1824 extern int __filemap_fdatawrite_range(struct address_space *mapping,
1825 loff_t start, loff_t end, int sync_mode);
1826 extern int filemap_fdatawrite_range(struct address_space *mapping,
1827 loff_t start, loff_t end);
1829 extern long do_fsync(struct file *file, int datasync);
1830 extern void sync_supers(void);
1831 extern void sync_filesystems(int wait);
1832 extern void __fsync_super(struct super_block *sb);
1833 extern void emergency_sync(void);
1834 extern void emergency_remount(void);
1835 extern int do_remount_sb(struct super_block *sb, int flags,
1836 void *data, int force);
1838 extern sector_t bmap(struct inode *, sector_t);
1840 extern int notify_change(struct dentry *, struct iattr *);
1841 extern int inode_permission(struct inode *, int);
1842 extern int generic_permission(struct inode *, int,
1843 int (*check_acl)(struct inode *, int));
1845 static inline bool execute_ok(struct inode *inode)
1847 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
1850 extern int get_write_access(struct inode *);
1851 extern int deny_write_access(struct file *);
1852 static inline void put_write_access(struct inode * inode)
1854 atomic_dec(&inode->i_writecount);
1856 static inline void allow_write_access(struct file *file)
1859 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
1861 extern int do_pipe(int *);
1862 extern int do_pipe_flags(int *, int);
1863 extern struct file *create_read_pipe(struct file *f, int flags);
1864 extern struct file *create_write_pipe(int flags);
1865 extern void free_write_pipe(struct file *);
1867 extern struct file *do_filp_open(int dfd, const char *pathname,
1868 int open_flag, int mode);
1869 extern int may_open(struct nameidata *, int, int);
1871 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1872 extern struct file * open_exec(const char *);
1874 /* fs/dcache.c -- generic fs support functions */
1875 extern int is_subdir(struct dentry *, struct dentry *);
1876 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1878 #include <linux/err.h>
1880 /* needed for stackable file system support */
1881 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1883 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1885 extern void inode_init_once(struct inode *);
1886 extern void iput(struct inode *);
1887 extern struct inode * igrab(struct inode *);
1888 extern ino_t iunique(struct super_block *, ino_t);
1889 extern int inode_needs_sync(struct inode *inode);
1890 extern void generic_delete_inode(struct inode *inode);
1891 extern void generic_drop_inode(struct inode *inode);
1893 extern struct inode *ilookup5_nowait(struct super_block *sb,
1894 unsigned long hashval, int (*test)(struct inode *, void *),
1896 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1897 int (*test)(struct inode *, void *), void *data);
1898 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1900 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1901 extern struct inode * iget_locked(struct super_block *, unsigned long);
1902 extern void unlock_new_inode(struct inode *);
1904 extern void __iget(struct inode * inode);
1905 extern void iget_failed(struct inode *);
1906 extern void clear_inode(struct inode *);
1907 extern void destroy_inode(struct inode *);
1908 extern struct inode *new_inode(struct super_block *);
1909 extern int should_remove_suid(struct dentry *);
1910 extern int file_remove_suid(struct file *);
1912 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1913 extern void remove_inode_hash(struct inode *);
1914 static inline void insert_inode_hash(struct inode *inode) {
1915 __insert_inode_hash(inode, inode->i_ino);
1918 extern struct file * get_empty_filp(void);
1919 extern void file_move(struct file *f, struct list_head *list);
1920 extern void file_kill(struct file *f);
1923 extern void submit_bio(int, struct bio *);
1924 extern int bdev_read_only(struct block_device *);
1926 extern int set_blocksize(struct block_device *, int);
1927 extern int sb_set_blocksize(struct super_block *, int);
1928 extern int sb_min_blocksize(struct super_block *, int);
1929 extern int sb_has_dirty_inodes(struct super_block *);
1931 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1932 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1933 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1934 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1935 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1936 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1937 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1938 unsigned long, loff_t);
1939 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1940 unsigned long *, loff_t, loff_t *, size_t, size_t);
1941 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1942 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1943 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1944 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1945 extern int generic_segment_checks(const struct iovec *iov,
1946 unsigned long *nr_segs, size_t *count, int access_flags);
1949 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
1950 struct pipe_inode_info *, size_t, unsigned int);
1951 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
1952 struct file *, loff_t *, size_t, unsigned int);
1953 extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1954 struct file *, loff_t *, size_t, unsigned int);
1955 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
1956 struct file *out, loff_t *, size_t len, unsigned int flags);
1957 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
1958 size_t len, unsigned int flags);
1961 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1962 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1963 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1964 extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
1966 extern int generic_file_open(struct inode * inode, struct file * filp);
1967 extern int nonseekable_open(struct inode * inode, struct file * filp);
1969 #ifdef CONFIG_FS_XIP
1970 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1972 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
1973 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1974 size_t len, loff_t *ppos);
1975 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
1977 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1984 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1985 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1986 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
1990 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1991 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1992 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1995 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1996 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1997 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1998 dio_iodone_t end_io)
2000 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2001 nr_segs, get_block, end_io, DIO_LOCKING);
2004 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
2005 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2006 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2007 dio_iodone_t end_io)
2009 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2010 nr_segs, get_block, end_io, DIO_NO_LOCKING);
2013 static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
2014 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2015 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2016 dio_iodone_t end_io)
2018 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2019 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
2023 extern const struct file_operations generic_ro_fops;
2025 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2027 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2028 extern int vfs_follow_link(struct nameidata *, const char *);
2029 extern int page_readlink(struct dentry *, char __user *, int);
2030 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2031 extern void page_put_link(struct dentry *, struct nameidata *, void *);
2032 extern int __page_symlink(struct inode *inode, const char *symname, int len,
2034 extern int page_symlink(struct inode *inode, const char *symname, int len);
2035 extern const struct inode_operations page_symlink_inode_operations;
2036 extern int generic_readlink(struct dentry *, char __user *, int);
2037 extern void generic_fillattr(struct inode *, struct kstat *);
2038 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2039 void inode_add_bytes(struct inode *inode, loff_t bytes);
2040 void inode_sub_bytes(struct inode *inode, loff_t bytes);
2041 loff_t inode_get_bytes(struct inode *inode);
2042 void inode_set_bytes(struct inode *inode, loff_t bytes);
2044 extern int vfs_readdir(struct file *, filldir_t, void *);
2046 extern int vfs_stat(char __user *, struct kstat *);
2047 extern int vfs_lstat(char __user *, struct kstat *);
2048 extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
2049 extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
2050 extern int vfs_fstat(unsigned int, struct kstat *);
2052 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2054 extern int generic_block_fiemap(struct inode *inode,
2055 struct fiemap_extent_info *fieinfo, u64 start,
2056 u64 len, get_block_t *get_block);
2058 extern void get_filesystem(struct file_system_type *fs);
2059 extern void put_filesystem(struct file_system_type *fs);
2060 extern struct file_system_type *get_fs_type(const char *name);
2061 extern struct super_block *get_super(struct block_device *);
2062 extern struct super_block *user_get_super(dev_t);
2063 extern void drop_super(struct super_block *sb);
2065 extern int dcache_dir_open(struct inode *, struct file *);
2066 extern int dcache_dir_close(struct inode *, struct file *);
2067 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2068 extern int dcache_readdir(struct file *, void *, filldir_t);
2069 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2070 extern int simple_statfs(struct dentry *, struct kstatfs *);
2071 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2072 extern int simple_unlink(struct inode *, struct dentry *);
2073 extern int simple_rmdir(struct inode *, struct dentry *);
2074 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2075 extern int simple_sync_file(struct file *, struct dentry *, int);
2076 extern int simple_empty(struct dentry *);
2077 extern int simple_readpage(struct file *file, struct page *page);
2078 extern int simple_prepare_write(struct file *file, struct page *page,
2079 unsigned offset, unsigned to);
2080 extern int simple_write_begin(struct file *file, struct address_space *mapping,
2081 loff_t pos, unsigned len, unsigned flags,
2082 struct page **pagep, void **fsdata);
2083 extern int simple_write_end(struct file *file, struct address_space *mapping,
2084 loff_t pos, unsigned len, unsigned copied,
2085 struct page *page, void *fsdata);
2087 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
2088 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2089 extern const struct file_operations simple_dir_operations;
2090 extern const struct inode_operations simple_dir_inode_operations;
2091 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
2092 struct dentry *d_alloc_name(struct dentry *, const char *);
2093 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
2094 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
2095 extern void simple_release_fs(struct vfsmount **mount, int *count);
2097 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2098 loff_t *ppos, const void *from, size_t available);
2100 #ifdef CONFIG_MIGRATION
2101 extern int buffer_migrate_page(struct address_space *,
2102 struct page *, struct page *);
2104 #define buffer_migrate_page NULL
2107 extern int inode_change_ok(struct inode *, struct iattr *);
2108 extern int __must_check inode_setattr(struct inode *, struct iattr *);
2110 extern void file_update_time(struct file *file);
2112 extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2113 extern void save_mount_options(struct super_block *sb, char *options);
2115 static inline ino_t parent_ino(struct dentry *dentry)
2119 spin_lock(&dentry->d_lock);
2120 res = dentry->d_parent->d_inode->i_ino;
2121 spin_unlock(&dentry->d_lock);
2125 /* Transaction based IO helpers */
2128 * An argresp is stored in an allocated page and holds the
2129 * size of the argument or response, along with its content
2131 struct simple_transaction_argresp {
2136 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2138 char *simple_transaction_get(struct file *file, const char __user *buf,
2140 ssize_t simple_transaction_read(struct file *file, char __user *buf,
2141 size_t size, loff_t *pos);
2142 int simple_transaction_release(struct inode *inode, struct file *file);
2144 static inline void simple_transaction_set(struct file *file, size_t n)
2146 struct simple_transaction_argresp *ar = file->private_data;
2148 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
2151 * The barrier ensures that ar->size will really remain zero until
2152 * ar->data is ready for reading.
2159 * simple attribute files
2161 * These attributes behave similar to those in sysfs:
2163 * Writing to an attribute immediately sets a value, an open file can be
2164 * written to multiple times.
2166 * Reading from an attribute creates a buffer from the value that might get
2167 * read with multiple read calls. When the attribute has been read
2168 * completely, no further read calls are possible until the file is opened
2171 * All attributes contain a text representation of a numeric value
2172 * that are accessed with the get() and set() functions.
2174 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2175 static int __fops ## _open(struct inode *inode, struct file *file) \
2177 __simple_attr_check_format(__fmt, 0ull); \
2178 return simple_attr_open(inode, file, __get, __set, __fmt); \
2180 static struct file_operations __fops = { \
2181 .owner = THIS_MODULE, \
2182 .open = __fops ## _open, \
2183 .release = simple_attr_release, \
2184 .read = simple_attr_read, \
2185 .write = simple_attr_write, \
2188 static inline void __attribute__((format(printf, 1, 2)))
2189 __simple_attr_check_format(const char *fmt, ...)
2191 /* don't do anything, just let the compiler check the arguments; */
2194 int simple_attr_open(struct inode *inode, struct file *file,
2195 int (*get)(void *, u64 *), int (*set)(void *, u64),
2197 int simple_attr_release(struct inode *inode, struct file *file);
2198 ssize_t simple_attr_read(struct file *file, char __user *buf,
2199 size_t len, loff_t *ppos);
2200 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2201 size_t len, loff_t *ppos);
2204 #ifdef CONFIG_SECURITY
2205 static inline char *alloc_secdata(void)
2207 return (char *)get_zeroed_page(GFP_KERNEL);
2210 static inline void free_secdata(void *secdata)
2212 free_page((unsigned long)secdata);
2215 static inline char *alloc_secdata(void)
2220 static inline void free_secdata(void *secdata)
2222 #endif /* CONFIG_SECURITY */
2225 int proc_nr_files(struct ctl_table *table, int write, struct file *filp,
2226 void __user *buffer, size_t *lenp, loff_t *ppos);
2228 int get_filesystem_list(char * buf);
2230 #endif /* __KERNEL__ */
2231 #endif /* _LINUX_FS_H */