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 4096 /* 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_TAGGED (1<<24) /* use generic inode tagging */
125 #define MS_TAGID (1<<25) /* use specific tag for this mount */
126 #define MS_ACTIVE (1<<30)
127 #define MS_NOUSER (1<<31)
130 * Superblock flags that can be altered by MS_REMOUNT
132 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
135 * Old magic mount flag and mask
137 #define MS_MGC_VAL 0xC0ED0000
138 #define MS_MGC_MSK 0xffff0000
140 /* Inode flags - they have nothing to superblock flags now */
142 #define S_SYNC 1 /* Writes are synced at once */
143 #define S_NOATIME 2 /* Do not update access times */
144 #define S_APPEND 4 /* Append-only file */
145 #define S_IMMUTABLE 8 /* Immutable file */
146 #define S_DEAD 16 /* removed, but still open directory */
147 #define S_NOQUOTA 32 /* Inode is not counted to quota */
148 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
149 #define S_NOCMTIME 128 /* Do not update file c/mtime */
150 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
151 #define S_PRIVATE 512 /* Inode is fs-internal */
152 #define S_BARRIER 1024 /* Barrier for chroot() */
153 #define S_IUNLINK 2048 /* Immutable unlink */
156 * Note that nosuid etc flags are inode-specific: setting some file-system
157 * flags just means all the inodes inherit those flags by default. It might be
158 * possible to override it selectively if you really wanted to with some
159 * ioctl() that is not currently implemented.
161 * Exception: MS_RDONLY is always applied to the entire file system.
163 * Unfortunately, it is possible to change a filesystems flags with it mounted
164 * with files in use. This means that all of the inodes will not have their
165 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
166 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
168 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
170 #define IS_RDONLY(inode) __IS_FLG(inode, MS_RDONLY)
171 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
172 ((inode)->i_flags & S_SYNC))
173 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
174 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
175 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
176 #define IS_TAGGED(inode) __IS_FLG(inode, MS_TAGGED)
178 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
179 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
180 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
181 #define IS_IUNLINK(inode) ((inode)->i_flags & S_IUNLINK)
182 #define IS_IXORUNLINK(inode) ((IS_IUNLINK(inode) ? S_IMMUTABLE : 0) ^ IS_IMMUTABLE(inode))
183 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
185 #define IS_BARRIER(inode) (S_ISDIR((inode)->i_mode) && ((inode)->i_flags & S_BARRIER))
186 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
187 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
188 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
189 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
191 #ifdef CONFIG_VSERVER_COWBL
192 # define IS_COW(inode) (IS_IUNLINK(inode) && IS_IMMUTABLE(inode))
193 # define IS_COW_LINK(inode) (S_ISREG((inode)->i_mode) && ((inode)->i_nlink > 1))
195 # define IS_COW(inode) (0)
196 # define IS_COW_LINK(inode) (0)
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)
233 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
234 #define FIBMAP _IO(0x00,1) /* bmap access */
235 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
237 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
238 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
239 #define FS_IOC_GETVERSION _IOR('v', 1, long)
240 #define FS_IOC_SETVERSION _IOW('v', 2, long)
241 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
242 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
243 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
244 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
247 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
249 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
250 #define FS_UNRM_FL 0x00000002 /* Undelete */
251 #define FS_COMPR_FL 0x00000004 /* Compress file */
252 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
253 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
254 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
255 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
256 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
257 /* Reserved for compression usage... */
258 #define FS_DIRTY_FL 0x00000100
259 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
260 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
261 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
262 /* End compression flags --- maybe not all used */
263 #define FS_BTREE_FL 0x00001000 /* btree format dir */
264 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
265 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
266 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
267 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
268 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
269 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
270 #define FS_EXTENT_FL 0x00080000 /* Extents */
271 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
272 #define FS_BARRIER_FL 0x04000000 /* Barrier for chroot() */
273 #define FS_IUNLINK_FL 0x08000000 /* Immutable unlink */
274 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
276 #ifdef CONFIG_VSERVER_LEGACY
277 /* VSERVER values defined for PlanetLab */
278 #define FS_FL_USER_VISIBLE 0x0C03DFFF /* User visible flags */
279 #define FS_FL_USER_MODIFIABLE 0x0C0380FF /* User modifiable flags */
281 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
282 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
285 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
286 #define SYNC_FILE_RANGE_WRITE 2
287 #define SYNC_FILE_RANGE_WAIT_AFTER 4
291 #include <linux/linkage.h>
292 #include <linux/wait.h>
293 #include <linux/types.h>
294 #include <linux/kdev_t.h>
295 #include <linux/dcache.h>
296 #include <linux/namei.h>
297 #include <linux/stat.h>
298 #include <linux/cache.h>
299 #include <linux/kobject.h>
300 #include <linux/list.h>
301 #include <linux/radix-tree.h>
302 #include <linux/prio_tree.h>
303 #include <linux/init.h>
304 #include <linux/pid.h>
305 #include <linux/mutex.h>
307 #include <asm/atomic.h>
308 #include <asm/semaphore.h>
309 #include <asm/byteorder.h>
315 struct pipe_inode_info;
316 struct poll_table_struct;
318 struct vm_area_struct;
321 extern void __init inode_init(unsigned long);
322 extern void __init inode_init_early(void);
323 extern void __init mnt_init(unsigned long);
324 extern void __init files_init(unsigned long);
327 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
328 struct buffer_head *bh_result, int create);
329 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
330 ssize_t bytes, void *private);
333 * Attribute flags. These should be or-ed together to figure out what
340 #define ATTR_ATIME 16
341 #define ATTR_MTIME 32
342 #define ATTR_CTIME 64
343 #define ATTR_ATIME_SET 128
344 #define ATTR_MTIME_SET 256
345 #define ATTR_FORCE 512 /* Not a change, but a change it */
346 #define ATTR_ATTR_FLAG 1024
347 #define ATTR_KILL_SUID 2048
348 #define ATTR_KILL_SGID 4096
349 #define ATTR_FILE 8192
350 #define ATTR_TAG 16384
353 * This is the Inode Attributes structure, used for notify_change(). It
354 * uses the above definitions as flags, to know which values have changed.
355 * Also, in this manner, a Filesystem can look at only the values it cares
356 * about. Basically, these are the attributes that the VFS layer can
357 * request to change from the FS layer.
359 * Derek Atkins <warlord@MIT.EDU> 94-10-20
362 unsigned int ia_valid;
368 struct timespec ia_atime;
369 struct timespec ia_mtime;
370 struct timespec ia_ctime;
373 * Not an attribute, but an auxilary info for filesystems wanting to
374 * implement an ftruncate() like method. NOTE: filesystem should
375 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
377 struct file *ia_file;
380 #define ATTR_FLAG_BARRIER 512 /* Barrier for chroot() */
381 #define ATTR_FLAG_IUNLINK 1024 /* Immutable unlink */
384 * Includes for diskquotas.
386 #include <linux/quota.h>
389 * enum positive_aop_returns - aop return codes with specific semantics
391 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
392 * completed, that the page is still locked, and
393 * should be considered active. The VM uses this hint
394 * to return the page to the active list -- it won't
395 * be a candidate for writeback again in the near
396 * future. Other callers must be careful to unlock
397 * the page if they get this return. Returned by
400 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
401 * unlocked it and the page might have been truncated.
402 * The caller should back up to acquiring a new page and
403 * trying again. The aop will be taking reasonable
404 * precautions not to livelock. If the caller held a page
405 * reference, it should drop it before retrying. Returned
406 * by readpage(), prepare_write(), and commit_write().
408 * address_space_operation functions return these large constants to indicate
409 * special semantics to the caller. These are much larger than the bytes in a
410 * page to allow for functions that return the number of bytes operated on in a
414 enum positive_aop_returns {
415 AOP_WRITEPAGE_ACTIVATE = 0x80000,
416 AOP_TRUNCATED_PAGE = 0x80001,
420 * oh the beauties of C type declarations.
423 struct address_space;
424 struct writeback_control;
426 struct address_space_operations {
427 int (*writepage)(struct page *page, struct writeback_control *wbc);
428 int (*readpage)(struct file *, struct page *);
429 void (*sync_page)(struct page *);
431 /* Write back some dirty pages from this mapping. */
432 int (*writepages)(struct address_space *, struct writeback_control *);
434 /* Set a page dirty. Return true if this dirtied it */
435 int (*set_page_dirty)(struct page *page);
437 int (*readpages)(struct file *filp, struct address_space *mapping,
438 struct list_head *pages, unsigned nr_pages);
441 * ext3 requires that a successful prepare_write() call be followed
442 * by a commit_write() call - they must be balanced
444 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
445 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
446 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
447 sector_t (*bmap)(struct address_space *, sector_t);
448 void (*invalidatepage) (struct page *, unsigned long);
449 int (*releasepage) (struct page *, gfp_t);
450 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
451 loff_t offset, unsigned long nr_segs);
452 struct page* (*get_xip_page)(struct address_space *, sector_t,
454 /* migrate the contents of a page to the specified target */
455 int (*migratepage) (struct address_space *,
456 struct page *, struct page *);
457 int (*launder_page) (struct page *);
460 struct backing_dev_info;
461 struct address_space {
462 struct inode *host; /* owner: inode, block_device */
463 struct radix_tree_root page_tree; /* radix tree of all pages */
464 rwlock_t tree_lock; /* and rwlock protecting it */
465 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
466 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
467 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
468 spinlock_t i_mmap_lock; /* protect tree, count, list */
469 unsigned int truncate_count; /* Cover race condition with truncate */
470 unsigned long nrpages; /* number of total pages */
471 pgoff_t writeback_index;/* writeback starts here */
472 const struct address_space_operations *a_ops; /* methods */
473 unsigned long flags; /* error bits/gfp mask */
474 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
475 spinlock_t private_lock; /* for use by the address_space */
476 struct list_head private_list; /* ditto */
477 struct address_space *assoc_mapping; /* ditto */
478 } __attribute__((aligned(sizeof(long))));
480 * On most architectures that alignment is already the case; but
481 * must be enforced here for CRIS, to let the least signficant bit
482 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
485 struct block_device {
486 dev_t bd_dev; /* not a kdev_t - it's a search key */
487 struct inode * bd_inode; /* will die */
489 struct mutex bd_mutex; /* open/close mutex */
490 struct semaphore bd_mount_sem;
491 struct list_head bd_inodes;
495 struct list_head bd_holder_list;
497 struct block_device * bd_contains;
498 unsigned bd_block_size;
499 struct hd_struct * bd_part;
500 /* number of times partitions within this device have been opened. */
501 unsigned bd_part_count;
503 struct gendisk * bd_disk;
504 struct list_head bd_list;
505 struct backing_dev_info *bd_inode_backing_dev_info;
507 * Private data. You must have bd_claim'ed the block_device
508 * to use this. NOTE: bd_claim allows an owner to claim
509 * the same device multiple times, the owner must take special
510 * care to not mess up bd_private for that case.
512 unsigned long bd_private;
516 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
519 #define PAGECACHE_TAG_DIRTY 0
520 #define PAGECACHE_TAG_WRITEBACK 1
522 int mapping_tagged(struct address_space *mapping, int tag);
525 * Might pages of this file be mapped into userspace?
527 static inline int mapping_mapped(struct address_space *mapping)
529 return !prio_tree_empty(&mapping->i_mmap) ||
530 !list_empty(&mapping->i_mmap_nonlinear);
534 * Might pages of this file have been modified in userspace?
535 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
536 * marks vma as VM_SHARED if it is shared, and the file was opened for
537 * writing i.e. vma may be mprotected writable even if now readonly.
539 static inline int mapping_writably_mapped(struct address_space *mapping)
541 return mapping->i_mmap_writable != 0;
545 * Use sequence counter to get consistent i_size on 32-bit processors.
547 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
548 #include <linux/seqlock.h>
549 #define __NEED_I_SIZE_ORDERED
550 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
552 #define i_size_ordered_init(inode) do { } while (0)
556 struct hlist_node i_hash;
557 struct list_head i_list;
558 struct list_head i_sb_list;
559 struct list_head i_dentry;
562 unsigned int i_nlink;
567 unsigned long i_version;
569 #ifdef __NEED_I_SIZE_ORDERED
570 seqcount_t i_size_seqcount;
572 struct timespec i_atime;
573 struct timespec i_mtime;
574 struct timespec i_ctime;
575 unsigned int i_blkbits;
577 unsigned short i_bytes;
579 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
580 struct mutex i_mutex;
581 struct rw_semaphore i_alloc_sem;
582 struct inode_operations *i_op;
583 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
584 struct super_block *i_sb;
585 struct file_lock *i_flock;
586 struct address_space *i_mapping;
587 struct address_space i_data;
589 struct dquot *i_dquot[MAXQUOTAS];
591 struct list_head i_devices;
593 struct pipe_inode_info *i_pipe;
594 struct block_device *i_bdev;
601 #ifdef CONFIG_DNOTIFY
602 unsigned long i_dnotify_mask; /* Directory notify events */
603 struct dnotify_struct *i_dnotify; /* for directory notifications */
606 #ifdef CONFIG_INOTIFY
607 struct list_head inotify_watches; /* watches on this inode */
608 struct mutex inotify_mutex; /* protects the watches list */
611 unsigned long i_state;
612 unsigned long dirtied_when; /* jiffies of first dirtying */
614 unsigned int i_flags;
616 atomic_t i_writecount;
617 #ifdef CONFIG_SECURITY
620 void *i_private; /* fs or device private pointer */
624 * inode->i_mutex nesting subclasses for the lock validator:
626 * 0: the object of the current VFS operation
631 * The locking order between these classes is
632 * parent -> child -> normal -> xattr -> quota
634 enum inode_i_mutex_lock_class
643 extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
644 extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
647 * NOTE: in a 32bit arch with a preemptable kernel and
648 * an UP compile the i_size_read/write must be atomic
649 * with respect to the local cpu (unlike with preempt disabled),
650 * but they don't need to be atomic with respect to other cpus like in
651 * true SMP (so they need either to either locally disable irq around
652 * the read or for example on x86 they can be still implemented as a
653 * cmpxchg8b without the need of the lock prefix). For SMP compiles
654 * and 64bit archs it makes no difference if preempt is enabled or not.
656 static inline loff_t i_size_read(const struct inode *inode)
658 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
663 seq = read_seqcount_begin(&inode->i_size_seqcount);
664 i_size = inode->i_size;
665 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
667 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
671 i_size = inode->i_size;
675 return inode->i_size;
680 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
681 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
682 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
684 static inline void i_size_write(struct inode *inode, loff_t i_size)
686 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
687 write_seqcount_begin(&inode->i_size_seqcount);
688 inode->i_size = i_size;
689 write_seqcount_end(&inode->i_size_seqcount);
690 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
692 inode->i_size = i_size;
695 inode->i_size = i_size;
699 static inline unsigned iminor(const struct inode *inode)
701 return MINOR(inode->i_rdev);
704 static inline unsigned imajor(const struct inode *inode)
706 return MAJOR(inode->i_rdev);
709 extern struct block_device *I_BDEV(struct inode *inode);
712 rwlock_t lock; /* protects pid, uid, euid fields */
713 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
714 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
715 uid_t uid, euid; /* uid/euid of process setting the owner */
716 int signum; /* posix.1b rt signal to be delivered on IO */
720 * Track a single file's readahead state
722 struct file_ra_state {
723 unsigned long start; /* Current window */
725 unsigned long flags; /* ra flags RA_FLAG_xxx*/
726 unsigned long cache_hit; /* cache hit count*/
727 unsigned long prev_page; /* Cache last read() position */
728 unsigned long ahead_start; /* Ahead window */
729 unsigned long ahead_size;
730 unsigned long ra_pages; /* Maximum readahead window */
731 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
732 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
733 unsigned int offset; /* Offset where last read() ended in a page */
735 #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
736 #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
740 * fu_list becomes invalid after file_free is called and queued via
741 * fu_rcuhead for RCU freeing
744 struct list_head fu_list;
745 struct rcu_head fu_rcuhead;
748 #define f_dentry f_path.dentry
749 #define f_vfsmnt f_path.mnt
750 const struct file_operations *f_op;
752 unsigned int f_flags;
755 struct fown_struct f_owner;
756 unsigned int f_uid, f_gid;
758 struct file_ra_state f_ra;
760 unsigned long f_version;
761 #ifdef CONFIG_SECURITY
764 /* needed for tty driver, and maybe others */
768 /* Used by fs/eventpoll.c to link all the hooks to this file */
769 struct list_head f_ep_links;
770 spinlock_t f_ep_lock;
771 #endif /* #ifdef CONFIG_EPOLL */
772 struct address_space *f_mapping;
774 extern spinlock_t files_lock;
775 #define file_list_lock() spin_lock(&files_lock);
776 #define file_list_unlock() spin_unlock(&files_lock);
778 #define get_file(x) atomic_inc(&(x)->f_count)
779 #define file_count(x) atomic_read(&(x)->f_count)
781 #define MAX_NON_LFS ((1UL<<31) - 1)
783 /* Page cache limit. The filesystems should put that into their s_maxbytes
784 limits, otherwise bad things can happen in VM. */
785 #if BITS_PER_LONG==32
786 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
787 #elif BITS_PER_LONG==64
788 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
793 #define FL_ACCESS 8 /* not trying to lock, just looking */
794 #define FL_EXISTS 16 /* when unlocking, test for existence */
795 #define FL_LEASE 32 /* lease held on this file */
796 #define FL_CLOSE 64 /* unlock on close */
797 #define FL_SLEEP 128 /* A blocking lock */
800 * The POSIX file lock owner is determined by
801 * the "struct files_struct" in the thread group
802 * (or NULL for no owner - BSD locks).
804 * Lockd stuffs a "host" pointer into this.
806 typedef struct files_struct *fl_owner_t;
808 struct file_lock_operations {
809 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
810 void (*fl_remove)(struct file_lock *); /* lock removal callback */
811 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
812 void (*fl_release_private)(struct file_lock *);
815 struct lock_manager_operations {
816 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
817 void (*fl_notify)(struct file_lock *); /* unblock callback */
818 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
819 void (*fl_release_private)(struct file_lock *);
820 void (*fl_break)(struct file_lock *);
821 int (*fl_mylease)(struct file_lock *, struct file_lock *);
822 int (*fl_change)(struct file_lock **, int);
825 /* that will die - we need it for nfs_lock_info */
826 #include <linux/nfs_fs_i.h>
829 struct file_lock *fl_next; /* singly linked list for this inode */
830 struct list_head fl_link; /* doubly linked list of all locks */
831 struct list_head fl_block; /* circular list of blocked processes */
834 wait_queue_head_t fl_wait;
835 struct file *fl_file;
836 unsigned char fl_flags;
837 unsigned char fl_type;
842 struct fasync_struct * fl_fasync; /* for lease break notifications */
843 unsigned long fl_break_time; /* for nonblocking lease breaks */
845 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
846 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
848 struct nfs_lock_info nfs_fl;
849 struct nfs4_lock_info nfs4_fl;
853 /* The following constant reflects the upper bound of the file/locking space */
855 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
856 #define OFFSET_MAX INT_LIMIT(loff_t)
857 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
860 #include <linux/fcntl.h>
862 extern int fcntl_getlk(struct file *, struct flock __user *);
863 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
864 struct flock __user *);
866 #if BITS_PER_LONG == 32
867 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
868 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
869 struct flock64 __user *);
872 extern void send_sigio(struct fown_struct *fown, int fd, int band);
873 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
874 extern int fcntl_getlease(struct file *filp);
877 extern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte,
881 extern void locks_init_lock(struct file_lock *);
882 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
883 extern void locks_remove_posix(struct file *, fl_owner_t);
884 extern void locks_remove_flock(struct file *);
885 extern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *);
886 extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *);
887 extern int posix_lock_file(struct file *, struct file_lock *);
888 extern int posix_lock_file_wait(struct file *, struct file_lock *);
889 extern int posix_unblock_lock(struct file *, struct file_lock *);
890 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
891 extern int __break_lease(struct inode *inode, unsigned int flags);
892 extern void lease_get_mtime(struct inode *, struct timespec *time);
893 extern int setlease(struct file *, long, struct file_lock **);
894 extern int lease_modify(struct file_lock **, int);
895 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
896 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
898 struct fasync_struct {
901 struct fasync_struct *fa_next; /* singly linked list */
902 struct file *fa_file;
905 #define FASYNC_MAGIC 0x4601
907 /* SMP safe fasync helpers: */
908 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
909 /* can be called from interrupts */
910 extern void kill_fasync(struct fasync_struct **, int, int);
911 /* only for net: no internal synchronization */
912 extern void __kill_fasync(struct fasync_struct *, int, int);
914 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
915 extern int f_setown(struct file *filp, unsigned long arg, int force);
916 extern void f_delown(struct file *filp);
917 extern pid_t f_getown(struct file *filp);
918 extern int send_sigurg(struct fown_struct *fown);
924 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
925 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
926 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
928 extern struct list_head super_blocks;
929 extern spinlock_t sb_lock;
931 #define sb_entry(list) list_entry((list), struct super_block, s_list)
932 #define S_BIAS (1<<30)
934 struct list_head s_list; /* Keep this first */
935 dev_t s_dev; /* search index; _not_ kdev_t */
936 unsigned long s_blocksize;
937 unsigned char s_blocksize_bits;
938 unsigned char s_dirt;
939 unsigned long long s_maxbytes; /* Max file size */
940 struct file_system_type *s_type;
941 struct super_operations *s_op;
942 struct dquot_operations *dq_op;
943 struct quotactl_ops *s_qcop;
944 struct export_operations *s_export_op;
945 unsigned long s_flags;
946 unsigned long s_magic;
947 struct dentry *s_root;
948 struct rw_semaphore s_umount;
954 #ifdef CONFIG_SECURITY
957 struct xattr_handler **s_xattr;
959 struct list_head s_inodes; /* all inodes */
960 struct list_head s_dirty; /* dirty inodes */
961 struct list_head s_io; /* parked for writeback */
962 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
963 struct list_head s_files;
965 struct block_device *s_bdev;
966 struct list_head s_instances;
967 struct quota_info s_dquot; /* Diskquota specific options */
970 wait_queue_head_t s_wait_unfrozen;
972 char s_id[32]; /* Informational name */
974 void *s_fs_info; /* Filesystem private info */
977 * The next field is for VFS *only*. No filesystems have any business
978 * even looking at it. You had been warned.
980 struct mutex s_vfs_rename_mutex; /* Kludge */
982 /* Granularity of c/m/atime in ns.
983 Cannot be worse than a second */
987 extern struct timespec current_fs_time(struct super_block *sb);
990 * Snapshotting support.
998 #define vfs_check_frozen(sb, level) \
999 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1001 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1002 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1003 #define has_fs_excl() atomic_read(¤t->fs_excl)
1005 /* not quite ready to be deprecated, but... */
1006 extern void lock_super(struct super_block *);
1007 extern void unlock_super(struct super_block *);
1010 * VFS helper functions..
1012 extern int vfs_permission(struct nameidata *, int);
1013 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1014 extern int vfs_mkdir(struct inode *, struct dentry *, int, struct nameidata *);
1015 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t, struct nameidata *);
1016 extern int vfs_symlink(struct inode *, struct dentry *, const char *, int, struct nameidata *);
1017 extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct nameidata *);
1018 extern int vfs_rmdir(struct inode *, struct dentry *, struct nameidata *);
1019 extern int vfs_unlink(struct inode *, struct dentry *, struct nameidata *);
1020 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1023 * VFS dentry helper functions.
1025 extern void dentry_unhash(struct dentry *dentry);
1028 * VFS file helper functions.
1030 extern int file_permission(struct file *, int);
1035 * NOTE! These match bits 12..15 of stat.st_mode
1036 * (ie "(i_mode >> 12) & 15").
1038 #define DT_UNKNOWN 0
1048 #define OSYNC_METADATA (1<<0)
1049 #define OSYNC_DATA (1<<1)
1050 #define OSYNC_INODE (1<<2)
1051 int generic_osync_inode(struct inode *, struct address_space *, int);
1054 * This is the "filldir" function type, used by readdir() to let
1055 * the kernel specify what kind of dirent layout it wants to have.
1056 * This allows the kernel to read directories into kernel space or
1057 * to have different dirent layouts depending on the binary type.
1059 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1061 struct block_device_operations {
1062 int (*open) (struct inode *, struct file *);
1063 int (*release) (struct inode *, struct file *);
1064 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
1065 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
1066 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
1067 int (*direct_access) (struct block_device *, sector_t, unsigned long *);
1068 int (*media_changed) (struct gendisk *);
1069 int (*revalidate_disk) (struct gendisk *);
1070 int (*getgeo)(struct block_device *, struct hd_geometry *);
1071 struct module *owner;
1075 * "descriptor" for what we're up to with a read for sendfile().
1076 * This allows us to use the same read code yet
1077 * have multiple different users of the data that
1078 * we read from a file.
1080 * The simplest case just copies the data to user
1091 } read_descriptor_t;
1093 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
1095 /* These macros are for out of kernel modules to test that
1096 * the kernel supports the unlocked_ioctl and compat_ioctl
1097 * fields in struct file_operations. */
1098 #define HAVE_COMPAT_IOCTL 1
1099 #define HAVE_UNLOCKED_IOCTL 1
1103 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1104 * can be called without the big kernel lock held in all filesystems.
1106 struct file_operations {
1107 struct module *owner;
1108 loff_t (*llseek) (struct file *, loff_t, int);
1109 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1110 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1111 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1112 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1113 int (*readdir) (struct file *, void *, filldir_t);
1114 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1115 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1116 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1117 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1118 int (*mmap) (struct file *, struct vm_area_struct *);
1119 int (*open) (struct inode *, struct file *);
1120 int (*flush) (struct file *, fl_owner_t id);
1121 int (*release) (struct inode *, struct file *);
1122 int (*fsync) (struct file *, struct dentry *, int datasync);
1123 int (*aio_fsync) (struct kiocb *, int datasync);
1124 int (*fasync) (int, struct file *, int);
1125 int (*lock) (struct file *, int, struct file_lock *);
1126 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
1127 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1128 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1129 int (*check_flags)(int);
1130 int (*dir_notify)(struct file *filp, unsigned long arg);
1131 int (*flock) (struct file *, int, struct file_lock *);
1132 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1133 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1136 struct inode_operations {
1137 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1138 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1139 int (*link) (struct dentry *,struct inode *,struct dentry *);
1140 int (*unlink) (struct inode *,struct dentry *);
1141 int (*symlink) (struct inode *,struct dentry *,const char *);
1142 int (*mkdir) (struct inode *,struct dentry *,int);
1143 int (*rmdir) (struct inode *,struct dentry *);
1144 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1145 int (*rename) (struct inode *, struct dentry *,
1146 struct inode *, struct dentry *);
1147 int (*readlink) (struct dentry *, char __user *,int);
1148 void * (*follow_link) (struct dentry *, struct nameidata *);
1149 void (*put_link) (struct dentry *, struct nameidata *, void *);
1150 void (*truncate) (struct inode *);
1151 int (*permission) (struct inode *, int, struct nameidata *);
1152 int (*setattr) (struct dentry *, struct iattr *);
1153 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1154 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1155 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1156 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1157 int (*removexattr) (struct dentry *, const char *);
1158 void (*truncate_range)(struct inode *, loff_t, loff_t);
1159 int (*sync_flags) (struct inode *);
1164 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1165 unsigned long nr_segs, unsigned long fast_segs,
1166 struct iovec *fast_pointer,
1167 struct iovec **ret_pointer);
1169 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1170 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1171 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1172 unsigned long, loff_t *);
1173 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1174 unsigned long, loff_t *);
1175 ssize_t vfs_sendfile(struct file *, struct file *, loff_t *, size_t, loff_t);
1178 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1179 * without the big kernel lock held in all filesystems.
1181 struct super_operations {
1182 struct inode *(*alloc_inode)(struct super_block *sb);
1183 void (*destroy_inode)(struct inode *);
1185 void (*read_inode) (struct inode *);
1187 void (*dirty_inode) (struct inode *);
1188 int (*write_inode) (struct inode *, int);
1189 void (*put_inode) (struct inode *);
1190 void (*drop_inode) (struct inode *);
1191 void (*delete_inode) (struct inode *);
1192 void (*put_super) (struct super_block *);
1193 void (*write_super) (struct super_block *);
1194 int (*sync_fs)(struct super_block *sb, int wait);
1195 void (*write_super_lockfs) (struct super_block *);
1196 void (*unlockfs) (struct super_block *);
1197 int (*statfs) (struct dentry *, struct kstatfs *);
1198 int (*remount_fs) (struct super_block *, int *, char *);
1199 void (*clear_inode) (struct inode *);
1200 void (*umount_begin) (struct vfsmount *, int);
1202 int (*show_options)(struct seq_file *, struct vfsmount *);
1203 int (*show_stats)(struct seq_file *, struct vfsmount *);
1205 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1206 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1210 /* Inode state bits. Protected by inode_lock. */
1211 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1212 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1213 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1215 #define I_LOCK (1 << __I_LOCK)
1216 #define I_FREEING 16
1219 #define I_WILL_FREE 128
1221 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1223 extern void __mark_inode_dirty(struct inode *, int);
1224 static inline void mark_inode_dirty(struct inode *inode)
1226 __mark_inode_dirty(inode, I_DIRTY);
1229 static inline void mark_inode_dirty_sync(struct inode *inode)
1231 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1234 static inline void inc_nlink(struct inode *inode)
1239 static inline void inode_inc_link_count(struct inode *inode)
1242 mark_inode_dirty(inode);
1245 static inline void drop_nlink(struct inode *inode)
1250 static inline void clear_nlink(struct inode *inode)
1255 static inline void inode_dec_link_count(struct inode *inode)
1258 mark_inode_dirty(inode);
1261 extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
1262 static inline void file_accessed(struct file *file)
1264 if (!(file->f_flags & O_NOATIME))
1265 touch_atime(file->f_path.mnt, file->f_path.dentry);
1268 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1271 * struct export_operations - for nfsd to communicate with file systems
1272 * @decode_fh: decode a file handle fragment and return a &struct dentry
1273 * @encode_fh: encode a file handle fragment from a dentry
1274 * @get_name: find the name for a given inode in a given directory
1275 * @get_parent: find the parent of a given directory
1276 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
1277 * @find_exported_dentry:
1278 * set by the exporting module to a standard helper function.
1281 * The export_operations structure provides a means for nfsd to communicate
1282 * with a particular exported file system - particularly enabling nfsd and
1283 * the filesystem to co-operate when dealing with file handles.
1285 * export_operations contains two basic operation for dealing with file
1286 * handles, decode_fh() and encode_fh(), and allows for some other
1287 * operations to be defined which standard helper routines use to get
1288 * specific information from the filesystem.
1290 * nfsd encodes information use to determine which filesystem a filehandle
1291 * applies to in the initial part of the file handle. The remainder, termed
1292 * a file handle fragment, is controlled completely by the filesystem. The
1293 * standard helper routines assume that this fragment will contain one or
1294 * two sub-fragments, one which identifies the file, and one which may be
1295 * used to identify the (a) directory containing the file.
1297 * In some situations, nfsd needs to get a dentry which is connected into a
1298 * specific part of the file tree. To allow for this, it passes the
1299 * function acceptable() together with a @context which can be used to see
1300 * if the dentry is acceptable. As there can be multiple dentrys for a
1301 * given file, the filesystem should check each one for acceptability before
1302 * looking for the next. As soon as an acceptable one is found, it should
1306 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1307 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1308 * @context). It should return a &struct dentry which refers to the same
1309 * file that the file handle fragment refers to, and which passes the
1310 * acceptability test. If it cannot, it should return a %NULL pointer if
1311 * the file was found but no acceptable &dentries were available, or a
1312 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1316 * @encode_fh should store in the file handle fragment @fh (using at most
1317 * @max_len bytes) information that can be used by @decode_fh to recover the
1318 * file refered to by the &struct dentry @de. If the @connectable flag is
1319 * set, the encode_fh() should store sufficient information so that a good
1320 * attempt can be made to find not only the file but also it's place in the
1321 * filesystem. This typically means storing a reference to de->d_parent in
1322 * the filehandle fragment. encode_fh() should return the number of bytes
1323 * stored or a negative error code such as %-ENOSPC
1326 * @get_name should find a name for the given @child in the given @parent
1327 * directory. The name should be stored in the @name (with the
1328 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1329 * buffer. get_name() should return %0 on success, a negative error code
1330 * or error. @get_name will be called without @parent->i_mutex held.
1333 * @get_parent should find the parent directory for the given @child which
1334 * is also a directory. In the event that it cannot be found, or storage
1335 * space cannot be allocated, a %ERR_PTR should be returned.
1338 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1339 * identifier, possibly an inode number, (@inump) get_dentry() should find
1340 * the identified inode and return a dentry for that inode. Any suitable
1341 * dentry can be returned including, if necessary, a new dentry created with
1342 * d_alloc_root. The caller can then find any other extant dentrys by
1343 * following the d_alias links. If a new dentry was created using
1344 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1345 * should be d_rehash()ed.
1347 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1348 * can be returned. The @inump will be whatever was passed to
1349 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
1352 * get_parent is called with child->d_inode->i_mutex down
1353 * get_name is not (which is possibly inconsistent)
1356 struct export_operations {
1357 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1358 int (*acceptable)(void *context, struct dentry *de),
1360 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1363 /* the following are only called from the filesystem itself */
1364 int (*get_name)(struct dentry *parent, char *name,
1365 struct dentry *child);
1366 struct dentry * (*get_parent)(struct dentry *child);
1367 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1369 /* This is set by the exporting module to a standard helper */
1370 struct dentry * (*find_exported_dentry)(
1371 struct super_block *sb, void *obj, void *parent,
1372 int (*acceptable)(void *context, struct dentry *de),
1378 extern struct dentry *
1379 find_exported_dentry(struct super_block *sb, void *obj, void *parent,
1380 int (*acceptable)(void *context, struct dentry *de),
1383 struct file_system_type {
1386 int (*get_sb) (struct file_system_type *, int,
1387 const char *, void *, struct vfsmount *);
1388 void (*kill_sb) (struct super_block *);
1389 struct module *owner;
1390 struct file_system_type * next;
1391 struct list_head fs_supers;
1392 struct lock_class_key s_lock_key;
1393 struct lock_class_key s_umount_key;
1396 extern int get_sb_bdev(struct file_system_type *fs_type,
1397 int flags, const char *dev_name, void *data,
1398 int (*fill_super)(struct super_block *, void *, int),
1399 struct vfsmount *mnt);
1400 extern int get_sb_single(struct file_system_type *fs_type,
1401 int flags, void *data,
1402 int (*fill_super)(struct super_block *, void *, int),
1403 struct vfsmount *mnt);
1404 extern int get_sb_nodev(struct file_system_type *fs_type,
1405 int flags, void *data,
1406 int (*fill_super)(struct super_block *, void *, int),
1407 struct vfsmount *mnt);
1408 void generic_shutdown_super(struct super_block *sb);
1409 void kill_block_super(struct super_block *sb);
1410 void kill_anon_super(struct super_block *sb);
1411 void kill_litter_super(struct super_block *sb);
1412 void deactivate_super(struct super_block *sb);
1413 int set_anon_super(struct super_block *s, void *data);
1414 struct super_block *sget(struct file_system_type *type,
1415 int (*test)(struct super_block *,void *),
1416 int (*set)(struct super_block *,void *),
1418 extern int get_sb_pseudo(struct file_system_type *, char *,
1419 struct super_operations *ops, unsigned long,
1420 struct vfsmount *mnt);
1421 extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
1422 int __put_super(struct super_block *sb);
1423 int __put_super_and_need_restart(struct super_block *sb);
1424 void unnamed_dev_init(void);
1426 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1427 #define fops_get(fops) \
1428 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1429 #define fops_put(fops) \
1430 do { if (fops) module_put((fops)->owner); } while(0)
1432 extern int register_filesystem(struct file_system_type *);
1433 extern int unregister_filesystem(struct file_system_type *);
1434 extern struct vfsmount *kern_mount(struct file_system_type *);
1435 extern int may_umount_tree(struct vfsmount *);
1436 extern int may_umount(struct vfsmount *);
1437 extern void umount_tree(struct vfsmount *, int, struct list_head *);
1438 extern void release_mounts(struct list_head *);
1439 extern long do_mount(char *, char *, char *, unsigned long, void *);
1440 extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
1441 extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
1444 extern int vfs_statfs(struct dentry *, struct kstatfs *);
1447 extern struct subsystem fs_subsys;
1449 #define FLOCK_VERIFY_READ 1
1450 #define FLOCK_VERIFY_WRITE 2
1452 extern int locks_mandatory_locked(struct inode *);
1453 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1456 * Candidates for mandatory locking have the setgid bit set
1457 * but no group execute bit - an otherwise meaningless combination.
1459 #define MANDATORY_LOCK(inode) \
1460 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1462 static inline int locks_verify_locked(struct inode *inode)
1464 if (MANDATORY_LOCK(inode))
1465 return locks_mandatory_locked(inode);
1469 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1471 static inline int locks_verify_truncate(struct inode *inode,
1475 if (inode->i_flock && MANDATORY_LOCK(inode))
1476 return locks_mandatory_area(
1477 FLOCK_VERIFY_WRITE, inode, filp,
1478 size < inode->i_size ? size : inode->i_size,
1479 (size < inode->i_size ? inode->i_size - size
1480 : size - inode->i_size)
1485 static inline int break_lease(struct inode *inode, unsigned int mode)
1488 return __break_lease(inode, mode);
1494 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1496 extern long do_sys_open(int fdf, const char __user *filename, int flags,
1498 extern struct file *filp_open(const char *, int, int);
1499 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1500 extern int filp_close(struct file *, fl_owner_t id);
1501 extern char * getname(const char __user *);
1504 extern void __init vfs_caches_init_early(void);
1505 extern void __init vfs_caches_init(unsigned long);
1507 extern struct kmem_cache *names_cachep;
1509 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
1510 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1511 #ifndef CONFIG_AUDITSYSCALL
1512 #define putname(name) __putname(name)
1514 extern void putname(const char *name);
1518 extern int register_blkdev(unsigned int, const char *);
1519 extern int unregister_blkdev(unsigned int, const char *);
1520 extern struct block_device *bdget(dev_t);
1521 extern void bd_set_size(struct block_device *, loff_t size);
1522 extern void bd_forget(struct inode *inode);
1523 extern void bdput(struct block_device *);
1524 extern struct block_device *open_by_devnum(dev_t, unsigned);
1525 extern const struct address_space_operations def_blk_aops;
1527 static inline void bd_forget(struct inode *inode) {}
1529 extern const struct file_operations def_blk_fops;
1530 extern const struct file_operations def_chr_fops;
1531 extern const struct file_operations bad_sock_fops;
1532 extern const struct file_operations def_fifo_fops;
1534 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1535 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1536 extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
1537 struct gendisk *disk, unsigned cmd,
1539 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1540 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1541 extern int blkdev_put(struct block_device *);
1542 extern int bd_claim(struct block_device *, void *);
1543 extern void bd_release(struct block_device *);
1545 extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1546 extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1548 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1549 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1554 #define CHRDEV_MAJOR_HASH_SIZE 255
1555 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1556 extern int register_chrdev_region(dev_t, unsigned, const char *);
1557 extern int register_chrdev(unsigned int, const char *,
1558 const struct file_operations *);
1559 extern int unregister_chrdev(unsigned int, const char *);
1560 extern void unregister_chrdev_region(dev_t, unsigned);
1561 extern int chrdev_open(struct inode *, struct file *);
1562 extern void chrdev_show(struct seq_file *,off_t);
1564 /* fs/block_dev.c */
1565 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1568 #define BLKDEV_MAJOR_HASH_SIZE 255
1569 extern const char *__bdevname(dev_t, char *buffer);
1570 extern const char *bdevname(struct block_device *bdev, char *buffer);
1571 extern struct block_device *lookup_bdev(const char *);
1572 extern struct block_device *open_bdev_excl(const char *, int, void *);
1573 extern void close_bdev_excl(struct block_device *);
1574 extern void blkdev_show(struct seq_file *,off_t);
1576 #define BLKDEV_MAJOR_HASH_SIZE 0
1579 extern void init_special_inode(struct inode *, umode_t, dev_t);
1581 /* Invalid inode operations -- fs/bad_inode.c */
1582 extern void make_bad_inode(struct inode *);
1583 extern int is_bad_inode(struct inode *);
1585 extern const struct file_operations read_fifo_fops;
1586 extern const struct file_operations write_fifo_fops;
1587 extern const struct file_operations rdwr_fifo_fops;
1589 extern int fs_may_remount_ro(struct super_block *);
1593 * return READ, READA, or WRITE
1595 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1598 * return data direction, READ or WRITE
1600 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1602 extern int check_disk_change(struct block_device *);
1603 extern int __invalidate_device(struct block_device *);
1604 extern int invalidate_partition(struct gendisk *, int);
1606 extern int invalidate_inodes(struct super_block *);
1607 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1608 pgoff_t start, pgoff_t end);
1609 unsigned long invalidate_inode_pages(struct address_space *mapping);
1610 static inline void invalidate_remote_inode(struct inode *inode)
1612 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1613 S_ISLNK(inode->i_mode))
1614 invalidate_inode_pages(inode->i_mapping);
1616 extern int invalidate_inode_pages2(struct address_space *mapping);
1617 extern int invalidate_inode_pages2_range(struct address_space *mapping,
1618 pgoff_t start, pgoff_t end);
1619 extern int write_inode_now(struct inode *, int);
1620 extern int filemap_fdatawrite(struct address_space *);
1621 extern int filemap_flush(struct address_space *);
1622 extern int filemap_fdatawait(struct address_space *);
1623 extern int filemap_write_and_wait(struct address_space *mapping);
1624 extern int filemap_write_and_wait_range(struct address_space *mapping,
1625 loff_t lstart, loff_t lend);
1626 extern int wait_on_page_writeback_range(struct address_space *mapping,
1627 pgoff_t start, pgoff_t end);
1628 extern int __filemap_fdatawrite_range(struct address_space *mapping,
1629 loff_t start, loff_t end, int sync_mode);
1631 extern long do_fsync(struct file *file, int datasync);
1632 extern void sync_supers(void);
1633 extern void sync_filesystems(int wait);
1634 extern void __fsync_super(struct super_block *sb);
1635 extern void emergency_sync(void);
1636 extern void emergency_remount(void);
1637 extern int do_remount_sb(struct super_block *sb, int flags,
1638 void *data, int force);
1640 extern sector_t bmap(struct inode *, sector_t);
1642 extern int notify_change(struct dentry *, struct iattr *);
1643 extern int permission(struct inode *, int, struct nameidata *);
1644 extern int generic_permission(struct inode *, int,
1645 int (*check_acl)(struct inode *, int));
1647 extern int get_write_access(struct inode *);
1648 extern int deny_write_access(struct file *);
1649 static inline void put_write_access(struct inode * inode)
1651 atomic_dec(&inode->i_writecount);
1653 static inline void allow_write_access(struct file *file)
1656 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
1658 extern int do_pipe(int *);
1659 extern struct file *create_read_pipe(struct file *f);
1660 extern struct file *create_write_pipe(void);
1661 extern void free_write_pipe(struct file *);
1663 extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
1664 extern int may_open(struct nameidata *, int, int);
1666 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1667 extern struct file * open_exec(const char *);
1669 /* fs/dcache.c -- generic fs support functions */
1670 extern int is_subdir(struct dentry *, struct dentry *);
1671 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1673 #include <linux/err.h>
1675 /* needed for stackable file system support */
1676 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1678 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1680 extern void inode_init_once(struct inode *);
1681 extern void iput(struct inode *);
1682 extern struct inode * igrab(struct inode *);
1683 extern ino_t iunique(struct super_block *, ino_t);
1684 extern int inode_needs_sync(struct inode *inode);
1685 extern void generic_delete_inode(struct inode *inode);
1686 extern void generic_drop_inode(struct inode *inode);
1688 extern struct inode *ilookup5_nowait(struct super_block *sb,
1689 unsigned long hashval, int (*test)(struct inode *, void *),
1691 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1692 int (*test)(struct inode *, void *), void *data);
1693 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1695 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1696 extern struct inode * iget_locked(struct super_block *, unsigned long);
1697 extern void unlock_new_inode(struct inode *);
1699 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1701 struct inode *inode = iget_locked(sb, ino);
1703 if (inode && (inode->i_state & I_NEW)) {
1704 sb->s_op->read_inode(inode);
1705 unlock_new_inode(inode);
1711 extern void __iget(struct inode * inode);
1712 extern void clear_inode(struct inode *);
1713 extern void destroy_inode(struct inode *);
1714 extern struct inode *new_inode(struct super_block *);
1715 extern int __remove_suid(struct dentry *, int);
1716 extern int should_remove_suid(struct dentry *);
1717 extern int remove_suid(struct dentry *);
1718 extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
1720 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1721 extern void remove_inode_hash(struct inode *);
1722 static inline void insert_inode_hash(struct inode *inode) {
1723 __insert_inode_hash(inode, inode->i_ino);
1726 extern struct file * get_empty_filp(void);
1727 extern void file_move(struct file *f, struct list_head *list);
1728 extern void file_kill(struct file *f);
1731 extern void submit_bio(int, struct bio *);
1732 extern int bdev_read_only(struct block_device *);
1734 extern int set_blocksize(struct block_device *, int);
1735 extern int sb_set_blocksize(struct super_block *, int);
1736 extern int sb_min_blocksize(struct super_block *, int);
1738 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1739 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1740 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1741 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1742 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1743 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1744 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1745 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1746 unsigned long, loff_t);
1747 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1748 unsigned long *, loff_t, loff_t *, size_t, size_t);
1749 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1750 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1751 extern int generic_file_buffered_write_one_kernel_page(struct address_space *,
1752 pgoff_t, struct page *);
1753 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1754 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1755 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
1756 extern ssize_t generic_file_sendpage(struct file *, struct page *, int, size_t, loff_t *, int);
1757 extern void do_generic_mapping_read(struct address_space *mapping,
1758 struct file_ra_state *, struct file *,
1759 loff_t *, read_descriptor_t *, read_actor_t);
1762 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
1763 struct pipe_inode_info *, size_t, unsigned int);
1764 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
1765 struct file *, loff_t *, size_t, unsigned int);
1766 extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1767 struct file *, loff_t *, size_t, unsigned int);
1768 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
1769 struct file *out, loff_t *, size_t len, unsigned int flags);
1770 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
1771 size_t len, unsigned int flags);
1774 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1775 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1776 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1777 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1778 extern int generic_file_open(struct inode * inode, struct file * filp);
1779 extern int nonseekable_open(struct inode * inode, struct file * filp);
1781 #ifdef CONFIG_FS_XIP
1782 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1784 extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
1785 size_t count, read_actor_t actor,
1787 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
1788 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1789 size_t len, loff_t *ppos);
1790 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
1792 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1798 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1799 read_descriptor_t * desc,
1802 do_generic_mapping_read(filp->f_mapping,
1811 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1812 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1813 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
1817 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1818 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1819 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1822 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1823 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1824 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1825 dio_iodone_t end_io)
1827 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1828 nr_segs, get_block, end_io, DIO_LOCKING);
1831 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1832 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1833 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1834 dio_iodone_t end_io)
1836 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1837 nr_segs, get_block, end_io, DIO_NO_LOCKING);
1840 static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1841 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1842 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1843 dio_iodone_t end_io)
1845 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1846 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
1850 extern const struct file_operations generic_ro_fops;
1852 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1854 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1855 extern int vfs_follow_link(struct nameidata *, const char *);
1856 extern int page_readlink(struct dentry *, char __user *, int);
1857 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1858 extern void page_put_link(struct dentry *, struct nameidata *, void *);
1859 extern int __page_symlink(struct inode *inode, const char *symname, int len,
1861 extern int page_symlink(struct inode *inode, const char *symname, int len);
1862 extern struct inode_operations page_symlink_inode_operations;
1863 extern int generic_readlink(struct dentry *, char __user *, int);
1864 extern void generic_fillattr(struct inode *, struct kstat *);
1865 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1866 void inode_add_bytes(struct inode *inode, loff_t bytes);
1867 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1868 loff_t inode_get_bytes(struct inode *inode);
1869 void inode_set_bytes(struct inode *inode, loff_t bytes);
1871 extern int vfs_readdir(struct file *, filldir_t, void *);
1873 extern int vfs_stat(char __user *, struct kstat *);
1874 extern int vfs_lstat(char __user *, struct kstat *);
1875 extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
1876 extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
1877 extern int vfs_fstat(unsigned int, struct kstat *);
1879 extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
1881 extern struct file_system_type *get_fs_type(const char *name);
1882 extern struct super_block *get_super(struct block_device *);
1883 extern struct super_block *user_get_super(dev_t);
1884 extern void drop_super(struct super_block *sb);
1886 extern int dcache_dir_open(struct inode *, struct file *);
1887 extern int dcache_dir_close(struct inode *, struct file *);
1888 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1889 extern int dcache_readdir(struct file *, void *, filldir_t);
1890 extern int dcache_readdir_filter(struct file *, void *, filldir_t, int (*)(struct dentry *));
1891 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1892 extern int simple_statfs(struct dentry *, struct kstatfs *);
1893 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1894 extern int simple_unlink(struct inode *, struct dentry *);
1895 extern int simple_rmdir(struct inode *, struct dentry *);
1896 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1897 extern int simple_sync_file(struct file *, struct dentry *, int);
1898 extern int simple_empty(struct dentry *);
1899 extern int simple_readpage(struct file *file, struct page *page);
1900 extern int simple_prepare_write(struct file *file, struct page *page,
1901 unsigned offset, unsigned to);
1902 extern int simple_commit_write(struct file *file, struct page *page,
1903 unsigned offset, unsigned to);
1905 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1906 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1907 extern const struct file_operations simple_dir_operations;
1908 extern struct inode_operations simple_dir_inode_operations;
1909 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
1910 struct dentry *d_alloc_name(struct dentry *, const char *);
1911 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1912 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
1913 extern void simple_release_fs(struct vfsmount **mount, int *count);
1915 extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
1917 #ifdef CONFIG_MIGRATION
1918 extern int buffer_migrate_page(struct address_space *,
1919 struct page *, struct page *);
1921 #define buffer_migrate_page NULL
1924 extern int inode_change_ok(struct inode *, struct iattr *);
1925 extern int __must_check inode_setattr(struct inode *, struct iattr *);
1927 extern void file_update_time(struct file *file);
1929 static inline ino_t parent_ino(struct dentry *dentry)
1933 spin_lock(&dentry->d_lock);
1934 res = dentry->d_parent->d_inode->i_ino;
1935 spin_unlock(&dentry->d_lock);
1940 extern int unshare_files(void);
1942 /* Transaction based IO helpers */
1945 * An argresp is stored in an allocated page and holds the
1946 * size of the argument or response, along with its content
1948 struct simple_transaction_argresp {
1953 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1955 char *simple_transaction_get(struct file *file, const char __user *buf,
1957 ssize_t simple_transaction_read(struct file *file, char __user *buf,
1958 size_t size, loff_t *pos);
1959 int simple_transaction_release(struct inode *inode, struct file *file);
1961 static inline void simple_transaction_set(struct file *file, size_t n)
1963 struct simple_transaction_argresp *ar = file->private_data;
1965 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
1968 * The barrier ensures that ar->size will really remain zero until
1969 * ar->data is ready for reading.
1976 * simple attribute files
1978 * These attributes behave similar to those in sysfs:
1980 * Writing to an attribute immediately sets a value, an open file can be
1981 * written to multiple times.
1983 * Reading from an attribute creates a buffer from the value that might get
1984 * read with multiple read calls. When the attribute has been read
1985 * completely, no further read calls are possible until the file is opened
1988 * All attributes contain a text representation of a numeric value
1989 * that are accessed with the get() and set() functions.
1991 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1992 static int __fops ## _open(struct inode *inode, struct file *file) \
1994 __simple_attr_check_format(__fmt, 0ull); \
1995 return simple_attr_open(inode, file, __get, __set, __fmt); \
1997 static struct file_operations __fops = { \
1998 .owner = THIS_MODULE, \
1999 .open = __fops ## _open, \
2000 .release = simple_attr_close, \
2001 .read = simple_attr_read, \
2002 .write = simple_attr_write, \
2005 static inline void __attribute__((format(printf, 1, 2)))
2006 __simple_attr_check_format(const char *fmt, ...)
2008 /* don't do anything, just let the compiler check the arguments; */
2011 int simple_attr_open(struct inode *inode, struct file *file,
2012 u64 (*get)(void *), void (*set)(void *, u64),
2014 int simple_attr_close(struct inode *inode, struct file *file);
2015 ssize_t simple_attr_read(struct file *file, char __user *buf,
2016 size_t len, loff_t *ppos);
2017 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2018 size_t len, loff_t *ppos);
2021 #ifdef CONFIG_SECURITY
2022 static inline char *alloc_secdata(void)
2024 return (char *)get_zeroed_page(GFP_KERNEL);
2027 static inline void free_secdata(void *secdata)
2029 free_page((unsigned long)secdata);
2032 static inline char *alloc_secdata(void)
2037 static inline void free_secdata(void *secdata)
2039 #endif /* CONFIG_SECURITY */
2041 #endif /* __KERNEL__ */
2042 #endif /* _LINUX_FS_H */