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locks: don't call ->copy_lock methods on return of conflicting locks
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1da177e4
LT
1#ifndef _LINUX_FS_H
2#define _LINUX_FS_H
3
4/*
5 * This file has definitions for some important file table
6 * structures etc.
7 */
8
1da177e4
LT
9#include <linux/limits.h>
10#include <linux/ioctl.h>
11
12/*
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.
17 *
18 * Some programs (notably those using select()) may have to be
19 * recompiled to take full advantage of the new limits..
20 */
21
22/* Fixed constants first: */
23#undef NR_OPEN
9cfe015a 24extern int sysctl_nr_open;
1da177e4
LT
25#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
26
27#define BLOCK_SIZE_BITS 10
28#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
29
01bf466e
DH
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 */
1ae7075b 33#define SEEK_MAX SEEK_END
01bf466e 34
1da177e4
LT
35/* And dynamically-tunable limits and defaults: */
36struct files_stat_struct {
37 int nr_files; /* read only */
38 int nr_free_files; /* read only */
39 int max_files; /* tunable */
40};
41extern struct files_stat_struct files_stat;
529bf6be 42extern int get_max_files(void);
1da177e4
LT
43
44struct inodes_stat_t {
45 int nr_inodes;
46 int nr_unused;
9e7bf24b 47 int dummy[5]; /* padding for sysctl ABI compatibility */
1da177e4
LT
48};
49extern struct inodes_stat_t inodes_stat;
50
51extern int leases_enable, lease_break_time;
52
53#ifdef CONFIG_DNOTIFY
54extern int dir_notify_enable;
55#endif
56
57#define NR_FILE 8192 /* this can well be larger on a larger system */
58
59#define MAY_EXEC 1
60#define MAY_WRITE 2
61#define MAY_READ 4
62#define MAY_APPEND 8
63
64#define FMODE_READ 1
65#define FMODE_WRITE 2
66
67/* Internal kernel extensions */
68#define FMODE_LSEEK 4
69#define FMODE_PREAD 8
70#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
71
b500531e
OD
72/* File is being opened for execution. Primary users of this flag are
73 distributed filesystems that can use it to achieve correct ETXTBUSY
74 behavior for cross-node execution/opening_for_writing of files */
75#define FMODE_EXEC 16
76
1da177e4
LT
77#define RW_MASK 1
78#define RWA_MASK 2
79#define READ 0
80#define WRITE 1
81#define READA 2 /* read-ahead - don't block if no resources */
a7662236 82#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
1da177e4 83#define READ_SYNC (READ | (1 << BIO_RW_SYNC))
5404bc7a 84#define READ_META (READ | (1 << BIO_RW_META))
1da177e4
LT
85#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
86#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
87
88#define SEL_IN 1
89#define SEL_OUT 2
90#define SEL_EX 4
91
92/* public flags for file_system_type */
93#define FS_REQUIRES_DEV 1
94#define FS_BINARY_MOUNTDATA 2
79c0b2df 95#define FS_HAS_SUBTYPE 4
1da177e4 96#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
349457cc
MF
97#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
98 * during rename() internally.
99 */
100
1da177e4
LT
101/*
102 * These are the fs-independent mount-flags: up to 32 flags are supported
103 */
104#define MS_RDONLY 1 /* Mount read-only */
105#define MS_NOSUID 2 /* Ignore suid and sgid bits */
106#define MS_NODEV 4 /* Disallow access to device special files */
107#define MS_NOEXEC 8 /* Disallow program execution */
108#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
109#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
110#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
111#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
112#define MS_NOATIME 1024 /* Do not update access times. */
113#define MS_NODIRATIME 2048 /* Do not update directory access times */
114#define MS_BIND 4096
115#define MS_MOVE 8192
116#define MS_REC 16384
9b04c997
TT
117#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
118 MS_VERBOSE is deprecated. */
119#define MS_SILENT 32768
bf066c7d 120#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
9676f0c6 121#define MS_UNBINDABLE (1<<17) /* change to unbindable */
07b20889 122#define MS_PRIVATE (1<<18) /* change to private */
a58b0eb8 123#define MS_SLAVE (1<<19) /* change to slave */
03e06e68 124#define MS_SHARED (1<<20) /* change to shared */
47ae32d6 125#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
8bf9725c 126#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
7a224228 127#define MS_I_VERSION (1<<23) /* Update inode I_version field */
1da177e4
LT
128#define MS_ACTIVE (1<<30)
129#define MS_NOUSER (1<<31)
130
131/*
132 * Superblock flags that can be altered by MS_REMOUNT
133 */
fc33a7bb 134#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
1da177e4
LT
135
136/*
137 * Old magic mount flag and mask
138 */
139#define MS_MGC_VAL 0xC0ED0000
140#define MS_MGC_MSK 0xffff0000
141
142/* Inode flags - they have nothing to superblock flags now */
143
144#define S_SYNC 1 /* Writes are synced at once */
145#define S_NOATIME 2 /* Do not update access times */
146#define S_APPEND 4 /* Append-only file */
147#define S_IMMUTABLE 8 /* Immutable file */
148#define S_DEAD 16 /* removed, but still open directory */
149#define S_NOQUOTA 32 /* Inode is not counted to quota */
150#define S_DIRSYNC 64 /* Directory modifications are synchronous */
151#define S_NOCMTIME 128 /* Do not update file c/mtime */
152#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
153#define S_PRIVATE 512 /* Inode is fs-internal */
154
155/*
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.
160 *
161 * Exception: MS_RDONLY is always applied to the entire file system.
162 *
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
167 */
168#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
169
170#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & 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)
37756ced 176#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
7a224228 177#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
1da177e4
LT
178
179#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
180#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
181#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1da177e4
LT
182#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
183
184#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
185#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
186#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
187#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
188
189/* the read-only stuff doesn't really belong here, but any other place is
190 probably as bad and I don't want to create yet another include file. */
191
192#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
193#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
194#define BLKRRPART _IO(0x12,95) /* re-read partition table */
195#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
196#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
197#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
198#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
199#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
200#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
201#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
202#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
203#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
204#if 0
205#define BLKPG _IO(0x12,105)/* See blkpg.h */
206
207/* Some people are morons. Do not use sizeof! */
208
209#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
210#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
211/* This was here just to show that the number is taken -
212 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
213#endif
214/* A jump here: 108-111 have been used for various private purposes. */
215#define BLKBSZGET _IOR(0x12,112,size_t)
216#define BLKBSZSET _IOW(0x12,113,size_t)
217#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
2056a782
JA
218#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
219#define BLKTRACESTART _IO(0x12,116)
220#define BLKTRACESTOP _IO(0x12,117)
221#define BLKTRACETEARDOWN _IO(0x12,118)
1da177e4
LT
222
223#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
224#define FIBMAP _IO(0x00,1) /* bmap access */
225#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
226
36695673
DH
227#define FS_IOC_GETFLAGS _IOR('f', 1, long)
228#define FS_IOC_SETFLAGS _IOW('f', 2, long)
229#define FS_IOC_GETVERSION _IOR('v', 1, long)
230#define FS_IOC_SETVERSION _IOW('v', 2, long)
231#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
232#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
233#define FS_IOC32_GETVERSION _IOR('v', 1, int)
234#define FS_IOC32_SETVERSION _IOW('v', 2, int)
235
236/*
237 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
238 */
239#define FS_SECRM_FL 0x00000001 /* Secure deletion */
240#define FS_UNRM_FL 0x00000002 /* Undelete */
241#define FS_COMPR_FL 0x00000004 /* Compress file */
242#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
243#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
244#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
245#define FS_NODUMP_FL 0x00000040 /* do not dump file */
246#define FS_NOATIME_FL 0x00000080 /* do not update atime */
247/* Reserved for compression usage... */
248#define FS_DIRTY_FL 0x00000100
249#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
250#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
251#define FS_ECOMPR_FL 0x00000800 /* Compression error */
252/* End compression flags --- maybe not all used */
253#define FS_BTREE_FL 0x00001000 /* btree format dir */
254#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
255#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
256#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
257#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
258#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
259#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
128e5eba
SW
260#define FS_EXTENT_FL 0x00080000 /* Extents */
261#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
36695673
DH
262#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
263
264#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
265#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
266
267
e46e4903
AM
268#define SYNC_FILE_RANGE_WAIT_BEFORE 1
269#define SYNC_FILE_RANGE_WRITE 2
270#define SYNC_FILE_RANGE_WAIT_AFTER 4
271
1da177e4
LT
272#ifdef __KERNEL__
273
274#include <linux/linkage.h>
275#include <linux/wait.h>
276#include <linux/types.h>
277#include <linux/kdev_t.h>
278#include <linux/dcache.h>
0f7fc9e4 279#include <linux/namei.h>
1da177e4
LT
280#include <linux/stat.h>
281#include <linux/cache.h>
282#include <linux/kobject.h>
283#include <linux/list.h>
284#include <linux/radix-tree.h>
285#include <linux/prio_tree.h>
286#include <linux/init.h>
914e2637 287#include <linux/pid.h>
1b1dcc1b 288#include <linux/mutex.h>
3bd858ab 289#include <linux/capability.h>
6188e10d 290#include <linux/semaphore.h>
1da177e4
LT
291
292#include <asm/atomic.h>
1da177e4
LT
293#include <asm/byteorder.h>
294
a5694255 295struct export_operations;
a885c8c4 296struct hd_geometry;
1da177e4
LT
297struct iovec;
298struct nameidata;
92198f7e 299struct kiocb;
1da177e4
LT
300struct pipe_inode_info;
301struct poll_table_struct;
302struct kstatfs;
303struct vm_area_struct;
304struct vfsmount;
305
74bf17cf 306extern void __init inode_init(void);
1da177e4 307extern void __init inode_init_early(void);
1da177e4
LT
308extern void __init files_init(unsigned long);
309
310struct buffer_head;
311typedef int (get_block_t)(struct inode *inode, sector_t iblock,
312 struct buffer_head *bh_result, int create);
92198f7e 313typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
1da177e4
LT
314 ssize_t bytes, void *private);
315
316/*
317 * Attribute flags. These should be or-ed together to figure out what
318 * has been changed!
319 */
320#define ATTR_MODE 1
321#define ATTR_UID 2
322#define ATTR_GID 4
323#define ATTR_SIZE 8
324#define ATTR_ATIME 16
325#define ATTR_MTIME 32
326#define ATTR_CTIME 64
327#define ATTR_ATIME_SET 128
328#define ATTR_MTIME_SET 256
329#define ATTR_FORCE 512 /* Not a change, but a change it */
330#define ATTR_ATTR_FLAG 1024
331#define ATTR_KILL_SUID 2048
332#define ATTR_KILL_SGID 4096
cc4e69de 333#define ATTR_FILE 8192
b5376771 334#define ATTR_KILL_PRIV 16384
d139d7ff 335#define ATTR_OPEN 32768 /* Truncating from open(O_TRUNC) */
1da177e4
LT
336
337/*
338 * This is the Inode Attributes structure, used for notify_change(). It
339 * uses the above definitions as flags, to know which values have changed.
340 * Also, in this manner, a Filesystem can look at only the values it cares
341 * about. Basically, these are the attributes that the VFS layer can
342 * request to change from the FS layer.
343 *
344 * Derek Atkins <warlord@MIT.EDU> 94-10-20
345 */
346struct iattr {
347 unsigned int ia_valid;
348 umode_t ia_mode;
349 uid_t ia_uid;
350 gid_t ia_gid;
351 loff_t ia_size;
352 struct timespec ia_atime;
353 struct timespec ia_mtime;
354 struct timespec ia_ctime;
cc4e69de
MS
355
356 /*
357 * Not an attribute, but an auxilary info for filesystems wanting to
358 * implement an ftruncate() like method. NOTE: filesystem should
359 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
360 */
361 struct file *ia_file;
1da177e4
LT
362};
363
1da177e4
LT
364/*
365 * Includes for diskquotas.
366 */
367#include <linux/quota.h>
368
994fc28c
ZB
369/**
370 * enum positive_aop_returns - aop return codes with specific semantics
371 *
372 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
373 * completed, that the page is still locked, and
374 * should be considered active. The VM uses this hint
375 * to return the page to the active list -- it won't
376 * be a candidate for writeback again in the near
377 * future. Other callers must be careful to unlock
378 * the page if they get this return. Returned by
379 * writepage();
380 *
381 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
382 * unlocked it and the page might have been truncated.
383 * The caller should back up to acquiring a new page and
384 * trying again. The aop will be taking reasonable
385 * precautions not to livelock. If the caller held a page
386 * reference, it should drop it before retrying. Returned
55144768 387 * by readpage().
994fc28c
ZB
388 *
389 * address_space_operation functions return these large constants to indicate
390 * special semantics to the caller. These are much larger than the bytes in a
391 * page to allow for functions that return the number of bytes operated on in a
392 * given page.
393 */
394
395enum positive_aop_returns {
396 AOP_WRITEPAGE_ACTIVATE = 0x80000,
397 AOP_TRUNCATED_PAGE = 0x80001,
398};
399
afddba49 400#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
89e10787 401#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
afddba49 402
1da177e4
LT
403/*
404 * oh the beauties of C type declarations.
405 */
406struct page;
407struct address_space;
408struct writeback_control;
1da177e4 409
2f718ffc
NP
410struct iov_iter {
411 const struct iovec *iov;
412 unsigned long nr_segs;
413 size_t iov_offset;
414 size_t count;
415};
416
417size_t iov_iter_copy_from_user_atomic(struct page *page,
418 struct iov_iter *i, unsigned long offset, size_t bytes);
419size_t iov_iter_copy_from_user(struct page *page,
420 struct iov_iter *i, unsigned long offset, size_t bytes);
421void iov_iter_advance(struct iov_iter *i, size_t bytes);
afddba49 422int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
2f718ffc
NP
423size_t iov_iter_single_seg_count(struct iov_iter *i);
424
425static inline void iov_iter_init(struct iov_iter *i,
426 const struct iovec *iov, unsigned long nr_segs,
427 size_t count, size_t written)
428{
429 i->iov = iov;
430 i->nr_segs = nr_segs;
431 i->iov_offset = 0;
432 i->count = count + written;
433
434 iov_iter_advance(i, written);
435}
436
437static inline size_t iov_iter_count(struct iov_iter *i)
438{
439 return i->count;
440}
441
442
1da177e4
LT
443struct address_space_operations {
444 int (*writepage)(struct page *page, struct writeback_control *wbc);
445 int (*readpage)(struct file *, struct page *);
3978d717 446 void (*sync_page)(struct page *);
1da177e4
LT
447
448 /* Write back some dirty pages from this mapping. */
449 int (*writepages)(struct address_space *, struct writeback_control *);
450
4741c9fd 451 /* Set a page dirty. Return true if this dirtied it */
1da177e4
LT
452 int (*set_page_dirty)(struct page *page);
453
454 int (*readpages)(struct file *filp, struct address_space *mapping,
455 struct list_head *pages, unsigned nr_pages);
456
457 /*
458 * ext3 requires that a successful prepare_write() call be followed
459 * by a commit_write() call - they must be balanced
460 */
461 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
462 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
afddba49
NP
463
464 int (*write_begin)(struct file *, struct address_space *mapping,
465 loff_t pos, unsigned len, unsigned flags,
466 struct page **pagep, void **fsdata);
467 int (*write_end)(struct file *, struct address_space *mapping,
468 loff_t pos, unsigned len, unsigned copied,
469 struct page *page, void *fsdata);
470
1da177e4
LT
471 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
472 sector_t (*bmap)(struct address_space *, sector_t);
2ff28e22 473 void (*invalidatepage) (struct page *, unsigned long);
27496a8c 474 int (*releasepage) (struct page *, gfp_t);
1da177e4
LT
475 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
476 loff_t offset, unsigned long nr_segs);
ceffc078
CO
477 struct page* (*get_xip_page)(struct address_space *, sector_t,
478 int);
e965f963 479 /* migrate the contents of a page to the specified target */
2d1db3b1
CL
480 int (*migratepage) (struct address_space *,
481 struct page *, struct page *);
e3db7691 482 int (*launder_page) (struct page *);
1da177e4
LT
483};
484
afddba49
NP
485/*
486 * pagecache_write_begin/pagecache_write_end must be used by general code
487 * to write into the pagecache.
488 */
489int pagecache_write_begin(struct file *, struct address_space *mapping,
490 loff_t pos, unsigned len, unsigned flags,
491 struct page **pagep, void **fsdata);
492
493int pagecache_write_end(struct file *, struct address_space *mapping,
494 loff_t pos, unsigned len, unsigned copied,
495 struct page *page, void *fsdata);
496
1da177e4
LT
497struct backing_dev_info;
498struct address_space {
499 struct inode *host; /* owner: inode, block_device */
500 struct radix_tree_root page_tree; /* radix tree of all pages */
501 rwlock_t tree_lock; /* and rwlock protecting it */
502 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
503 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
504 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
505 spinlock_t i_mmap_lock; /* protect tree, count, list */
506 unsigned int truncate_count; /* Cover race condition with truncate */
507 unsigned long nrpages; /* number of total pages */
508 pgoff_t writeback_index;/* writeback starts here */
f5e54d6e 509 const struct address_space_operations *a_ops; /* methods */
1da177e4
LT
510 unsigned long flags; /* error bits/gfp mask */
511 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
512 spinlock_t private_lock; /* for use by the address_space */
513 struct list_head private_list; /* ditto */
514 struct address_space *assoc_mapping; /* ditto */
515} __attribute__((aligned(sizeof(long))));
516 /*
517 * On most architectures that alignment is already the case; but
518 * must be enforced here for CRIS, to let the least signficant bit
519 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
520 */
521
522struct block_device {
523 dev_t bd_dev; /* not a kdev_t - it's a search key */
524 struct inode * bd_inode; /* will die */
525 int bd_openers;
c039e313 526 struct mutex bd_mutex; /* open/close mutex */
f73ca1b7 527 struct semaphore bd_mount_sem;
1da177e4
LT
528 struct list_head bd_inodes;
529 void * bd_holder;
530 int bd_holders;
641dc636
JN
531#ifdef CONFIG_SYSFS
532 struct list_head bd_holder_list;
533#endif
1da177e4
LT
534 struct block_device * bd_contains;
535 unsigned bd_block_size;
536 struct hd_struct * bd_part;
537 /* number of times partitions within this device have been opened. */
538 unsigned bd_part_count;
539 int bd_invalidated;
540 struct gendisk * bd_disk;
541 struct list_head bd_list;
542 struct backing_dev_info *bd_inode_backing_dev_info;
543 /*
544 * Private data. You must have bd_claim'ed the block_device
545 * to use this. NOTE: bd_claim allows an owner to claim
546 * the same device multiple times, the owner must take special
547 * care to not mess up bd_private for that case.
548 */
549 unsigned long bd_private;
550};
551
552/*
553 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
554 * radix trees
555 */
556#define PAGECACHE_TAG_DIRTY 0
557#define PAGECACHE_TAG_WRITEBACK 1
558
559int mapping_tagged(struct address_space *mapping, int tag);
560
561/*
562 * Might pages of this file be mapped into userspace?
563 */
564static inline int mapping_mapped(struct address_space *mapping)
565{
566 return !prio_tree_empty(&mapping->i_mmap) ||
567 !list_empty(&mapping->i_mmap_nonlinear);
568}
569
570/*
571 * Might pages of this file have been modified in userspace?
572 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
573 * marks vma as VM_SHARED if it is shared, and the file was opened for
574 * writing i.e. vma may be mprotected writable even if now readonly.
575 */
576static inline int mapping_writably_mapped(struct address_space *mapping)
577{
578 return mapping->i_mmap_writable != 0;
579}
580
581/*
582 * Use sequence counter to get consistent i_size on 32-bit processors.
583 */
584#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
585#include <linux/seqlock.h>
586#define __NEED_I_SIZE_ORDERED
587#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
588#else
589#define i_size_ordered_init(inode) do { } while (0)
590#endif
591
592struct inode {
593 struct hlist_node i_hash;
594 struct list_head i_list;
595 struct list_head i_sb_list;
596 struct list_head i_dentry;
597 unsigned long i_ino;
598 atomic_t i_count;
1da177e4
LT
599 unsigned int i_nlink;
600 uid_t i_uid;
601 gid_t i_gid;
602 dev_t i_rdev;
7a224228 603 u64 i_version;
1da177e4 604 loff_t i_size;
83b7b44e
ED
605#ifdef __NEED_I_SIZE_ORDERED
606 seqcount_t i_size_seqcount;
607#endif
1da177e4
LT
608 struct timespec i_atime;
609 struct timespec i_mtime;
610 struct timespec i_ctime;
611 unsigned int i_blkbits;
a0f62ac6 612 blkcnt_t i_blocks;
1da177e4 613 unsigned short i_bytes;
12d40e43 614 umode_t i_mode;
1da177e4 615 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
1b1dcc1b 616 struct mutex i_mutex;
1da177e4 617 struct rw_semaphore i_alloc_sem;
c5ef1c42 618 const struct inode_operations *i_op;
99ac48f5 619 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
1da177e4
LT
620 struct super_block *i_sb;
621 struct file_lock *i_flock;
622 struct address_space *i_mapping;
623 struct address_space i_data;
624#ifdef CONFIG_QUOTA
625 struct dquot *i_dquot[MAXQUOTAS];
626#endif
1da177e4 627 struct list_head i_devices;
4c154168
TT
628 union {
629 struct pipe_inode_info *i_pipe;
eaf796e7 630 struct block_device *i_bdev;
577c4eb0 631 struct cdev *i_cdev;
4c154168 632 };
1da177e4
LT
633 int i_cindex;
634
635 __u32 i_generation;
636
637#ifdef CONFIG_DNOTIFY
638 unsigned long i_dnotify_mask; /* Directory notify events */
639 struct dnotify_struct *i_dnotify; /* for directory notifications */
640#endif
641
0eeca283
RL
642#ifdef CONFIG_INOTIFY
643 struct list_head inotify_watches; /* watches on this inode */
d4f9af9d 644 struct mutex inotify_mutex; /* protects the watches list */
0eeca283
RL
645#endif
646
1da177e4
LT
647 unsigned long i_state;
648 unsigned long dirtied_when; /* jiffies of first dirtying */
649
650 unsigned int i_flags;
651
652 atomic_t i_writecount;
50462062 653#ifdef CONFIG_SECURITY
1da177e4 654 void *i_security;
50462062 655#endif
8e18e294 656 void *i_private; /* fs or device private pointer */
1da177e4
LT
657};
658
f2eace23
IM
659/*
660 * inode->i_mutex nesting subclasses for the lock validator:
661 *
662 * 0: the object of the current VFS operation
663 * 1: parent
664 * 2: child/target
665 * 3: quota file
666 *
667 * The locking order between these classes is
4df46240 668 * parent -> child -> normal -> xattr -> quota
f2eace23
IM
669 */
670enum inode_i_mutex_lock_class
671{
672 I_MUTEX_NORMAL,
673 I_MUTEX_PARENT,
674 I_MUTEX_CHILD,
4df46240 675 I_MUTEX_XATTR,
f2eace23
IM
676 I_MUTEX_QUOTA
677};
678
62752ee1
MF
679extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
680extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
681
1da177e4
LT
682/*
683 * NOTE: in a 32bit arch with a preemptable kernel and
684 * an UP compile the i_size_read/write must be atomic
685 * with respect to the local cpu (unlike with preempt disabled),
686 * but they don't need to be atomic with respect to other cpus like in
687 * true SMP (so they need either to either locally disable irq around
688 * the read or for example on x86 they can be still implemented as a
689 * cmpxchg8b without the need of the lock prefix). For SMP compiles
690 * and 64bit archs it makes no difference if preempt is enabled or not.
691 */
48ed214d 692static inline loff_t i_size_read(const struct inode *inode)
1da177e4
LT
693{
694#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
695 loff_t i_size;
696 unsigned int seq;
697
698 do {
699 seq = read_seqcount_begin(&inode->i_size_seqcount);
700 i_size = inode->i_size;
701 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
702 return i_size;
703#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
704 loff_t i_size;
705
706 preempt_disable();
707 i_size = inode->i_size;
708 preempt_enable();
709 return i_size;
710#else
711 return inode->i_size;
712#endif
713}
714
7762f5a0
MS
715/*
716 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
717 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
718 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
719 */
1da177e4
LT
720static inline void i_size_write(struct inode *inode, loff_t i_size)
721{
722#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
723 write_seqcount_begin(&inode->i_size_seqcount);
724 inode->i_size = i_size;
725 write_seqcount_end(&inode->i_size_seqcount);
726#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
727 preempt_disable();
728 inode->i_size = i_size;
729 preempt_enable();
730#else
731 inode->i_size = i_size;
732#endif
733}
734
48ed214d 735static inline unsigned iminor(const struct inode *inode)
1da177e4
LT
736{
737 return MINOR(inode->i_rdev);
738}
739
48ed214d 740static inline unsigned imajor(const struct inode *inode)
1da177e4
LT
741{
742 return MAJOR(inode->i_rdev);
743}
744
745extern struct block_device *I_BDEV(struct inode *inode);
746
747struct fown_struct {
748 rwlock_t lock; /* protects pid, uid, euid fields */
609d7fa9
EB
749 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
750 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
1da177e4 751 uid_t uid, euid; /* uid/euid of process setting the owner */
1da177e4
LT
752 int signum; /* posix.1b rt signal to be delivered on IO */
753};
754
755/*
756 * Track a single file's readahead state
757 */
758struct file_ra_state {
937085aa
FW
759 pgoff_t start; /* where readahead started */
760 unsigned int size; /* # of readahead pages */
761 unsigned int async_size; /* do asynchronous readahead when
f9acc8c7 762 there are only # of pages ahead */
5ce1110b 763
937085aa 764 unsigned int ra_pages; /* Maximum readahead window */
0bb7ba6b 765 int mmap_miss; /* Cache miss stat for mmap accesses */
f4e6b498 766 loff_t prev_pos; /* Cache last read() position */
1da177e4 767};
1da177e4 768
5ce1110b
FW
769/*
770 * Check if @index falls in the readahead windows.
771 */
772static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
773{
f9acc8c7
FW
774 return (index >= ra->start &&
775 index < ra->start + ra->size);
5ce1110b
FW
776}
777
ad775f5a
DH
778#define FILE_MNT_WRITE_TAKEN 1
779#define FILE_MNT_WRITE_RELEASED 2
780
1da177e4 781struct file {
2f512016
ED
782 /*
783 * fu_list becomes invalid after file_free is called and queued via
784 * fu_rcuhead for RCU freeing
785 */
786 union {
787 struct list_head fu_list;
788 struct rcu_head fu_rcuhead;
789 } f_u;
0f7fc9e4
JJS
790 struct path f_path;
791#define f_dentry f_path.dentry
792#define f_vfsmnt f_path.mnt
99ac48f5 793 const struct file_operations *f_op;
1da177e4
LT
794 atomic_t f_count;
795 unsigned int f_flags;
796 mode_t f_mode;
1da177e4
LT
797 loff_t f_pos;
798 struct fown_struct f_owner;
799 unsigned int f_uid, f_gid;
800 struct file_ra_state f_ra;
801
2b47c361 802 u64 f_version;
50462062 803#ifdef CONFIG_SECURITY
1da177e4 804 void *f_security;
50462062 805#endif
1da177e4
LT
806 /* needed for tty driver, and maybe others */
807 void *private_data;
808
809#ifdef CONFIG_EPOLL
810 /* Used by fs/eventpoll.c to link all the hooks to this file */
811 struct list_head f_ep_links;
812 spinlock_t f_ep_lock;
813#endif /* #ifdef CONFIG_EPOLL */
814 struct address_space *f_mapping;
ad775f5a
DH
815#ifdef CONFIG_DEBUG_WRITECOUNT
816 unsigned long f_mnt_write_state;
817#endif
1da177e4
LT
818};
819extern spinlock_t files_lock;
820#define file_list_lock() spin_lock(&files_lock);
821#define file_list_unlock() spin_unlock(&files_lock);
822
095975da 823#define get_file(x) atomic_inc(&(x)->f_count)
1da177e4
LT
824#define file_count(x) atomic_read(&(x)->f_count)
825
ad775f5a
DH
826#ifdef CONFIG_DEBUG_WRITECOUNT
827static inline void file_take_write(struct file *f)
828{
829 WARN_ON(f->f_mnt_write_state != 0);
830 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
831}
832static inline void file_release_write(struct file *f)
833{
834 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
835}
836static inline void file_reset_write(struct file *f)
837{
838 f->f_mnt_write_state = 0;
839}
840static inline void file_check_state(struct file *f)
841{
842 /*
843 * At this point, either both or neither of these bits
844 * should be set.
845 */
846 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
847 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
848}
849static inline int file_check_writeable(struct file *f)
850{
851 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
852 return 0;
853 printk(KERN_WARNING "writeable file with no "
854 "mnt_want_write()\n");
855 WARN_ON(1);
856 return -EINVAL;
857}
858#else /* !CONFIG_DEBUG_WRITECOUNT */
859static inline void file_take_write(struct file *filp) {}
860static inline void file_release_write(struct file *filp) {}
861static inline void file_reset_write(struct file *filp) {}
862static inline void file_check_state(struct file *filp) {}
863static inline int file_check_writeable(struct file *filp)
864{
865 return 0;
866}
867#endif /* CONFIG_DEBUG_WRITECOUNT */
868
1da177e4
LT
869#define MAX_NON_LFS ((1UL<<31) - 1)
870
871/* Page cache limit. The filesystems should put that into their s_maxbytes
872 limits, otherwise bad things can happen in VM. */
873#if BITS_PER_LONG==32
874#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
875#elif BITS_PER_LONG==64
876#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
877#endif
878
879#define FL_POSIX 1
880#define FL_FLOCK 2
881#define FL_ACCESS 8 /* not trying to lock, just looking */
f475ae95 882#define FL_EXISTS 16 /* when unlocking, test for existence */
1da177e4 883#define FL_LEASE 32 /* lease held on this file */
75e1fcc0 884#define FL_CLOSE 64 /* unlock on close */
1da177e4
LT
885#define FL_SLEEP 128 /* A blocking lock */
886
887/*
888 * The POSIX file lock owner is determined by
889 * the "struct files_struct" in the thread group
890 * (or NULL for no owner - BSD locks).
891 *
892 * Lockd stuffs a "host" pointer into this.
893 */
894typedef struct files_struct *fl_owner_t;
895
896struct file_lock_operations {
897 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
898 void (*fl_remove)(struct file_lock *); /* lock removal callback */
899 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
900 void (*fl_release_private)(struct file_lock *);
901};
902
903struct lock_manager_operations {
904 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
905 void (*fl_notify)(struct file_lock *); /* unblock callback */
2beb6614 906 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
1da177e4
LT
907 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
908 void (*fl_release_private)(struct file_lock *);
909 void (*fl_break)(struct file_lock *);
910 int (*fl_mylease)(struct file_lock *, struct file_lock *);
911 int (*fl_change)(struct file_lock **, int);
912};
913
914/* that will die - we need it for nfs_lock_info */
915#include <linux/nfs_fs_i.h>
916
917struct file_lock {
918 struct file_lock *fl_next; /* singly linked list for this inode */
919 struct list_head fl_link; /* doubly linked list of all locks */
920 struct list_head fl_block; /* circular list of blocked processes */
921 fl_owner_t fl_owner;
922 unsigned int fl_pid;
ab1f1611 923 struct pid *fl_nspid;
1da177e4
LT
924 wait_queue_head_t fl_wait;
925 struct file *fl_file;
926 unsigned char fl_flags;
927 unsigned char fl_type;
928 loff_t fl_start;
929 loff_t fl_end;
930
931 struct fasync_struct * fl_fasync; /* for lease break notifications */
932 unsigned long fl_break_time; /* for nonblocking lease breaks */
933
934 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
935 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
936 union {
937 struct nfs_lock_info nfs_fl;
8d0a8a9d 938 struct nfs4_lock_info nfs4_fl;
e8d6c554
DH
939 struct {
940 struct list_head link; /* link in AFS vnode's pending_locks list */
941 int state; /* state of grant or error if -ve */
942 } afs;
1da177e4
LT
943 } fl_u;
944};
945
946/* The following constant reflects the upper bound of the file/locking space */
947#ifndef OFFSET_MAX
948#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
949#define OFFSET_MAX INT_LIMIT(loff_t)
950#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
951#endif
952
1da177e4
LT
953#include <linux/fcntl.h>
954
955extern int fcntl_getlk(struct file *, struct flock __user *);
c293621b
PS
956extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
957 struct flock __user *);
1da177e4
LT
958
959#if BITS_PER_LONG == 32
960extern int fcntl_getlk64(struct file *, struct flock64 __user *);
c293621b
PS
961extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
962 struct flock64 __user *);
1da177e4
LT
963#endif
964
965extern void send_sigio(struct fown_struct *fown, int fd, int band);
966extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
967extern int fcntl_getlease(struct file *filp);
968
f79e2abb 969/* fs/sync.c */
5b04aa3a
MF
970extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
971 loff_t endbyte, unsigned int flags);
f79e2abb 972
1da177e4
LT
973/* fs/locks.c */
974extern void locks_init_lock(struct file_lock *);
975extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1a747ee0 976extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
1da177e4
LT
977extern void locks_remove_posix(struct file *, fl_owner_t);
978extern void locks_remove_flock(struct file *);
6d34ac19 979extern void posix_test_lock(struct file *, struct file_lock *);
150b3934 980extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1da177e4 981extern int posix_lock_file_wait(struct file *, struct file_lock *);
64a318ee 982extern int posix_unblock_lock(struct file *, struct file_lock *);
3ee17abd 983extern int vfs_test_lock(struct file *, struct file_lock *);
150b3934 984extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
9b9d2ab4 985extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1da177e4
LT
986extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
987extern int __break_lease(struct inode *inode, unsigned int flags);
988extern void lease_get_mtime(struct inode *, struct timespec *time);
0af1a450 989extern int generic_setlease(struct file *, long, struct file_lock **);
a9933cea 990extern int vfs_setlease(struct file *, long, struct file_lock **);
1da177e4
LT
991extern int lease_modify(struct file_lock **, int);
992extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
993extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
7f8ada98 994extern struct seq_operations locks_seq_operations;
1da177e4
LT
995
996struct fasync_struct {
997 int magic;
998 int fa_fd;
999 struct fasync_struct *fa_next; /* singly linked list */
1000 struct file *fa_file;
1001};
1002
1003#define FASYNC_MAGIC 0x4601
1004
1005/* SMP safe fasync helpers: */
1006extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1007/* can be called from interrupts */
1008extern void kill_fasync(struct fasync_struct **, int, int);
1009/* only for net: no internal synchronization */
1010extern void __kill_fasync(struct fasync_struct *, int, int);
1011
609d7fa9 1012extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1da177e4
LT
1013extern int f_setown(struct file *filp, unsigned long arg, int force);
1014extern void f_delown(struct file *filp);
609d7fa9 1015extern pid_t f_getown(struct file *filp);
1da177e4
LT
1016extern int send_sigurg(struct fown_struct *fown);
1017
1018/*
1019 * Umount options
1020 */
1021
1022#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1023#define MNT_DETACH 0x00000002 /* Just detach from the tree */
1024#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1025
1026extern struct list_head super_blocks;
1027extern spinlock_t sb_lock;
1028
1da177e4
LT
1029#define S_BIAS (1<<30)
1030struct super_block {
1031 struct list_head s_list; /* Keep this first */
1032 dev_t s_dev; /* search index; _not_ kdev_t */
1033 unsigned long s_blocksize;
1da177e4
LT
1034 unsigned char s_blocksize_bits;
1035 unsigned char s_dirt;
1036 unsigned long long s_maxbytes; /* Max file size */
1037 struct file_system_type *s_type;
ee9b6d61 1038 const struct super_operations *s_op;
1da177e4
LT
1039 struct dquot_operations *dq_op;
1040 struct quotactl_ops *s_qcop;
39655164 1041 const struct export_operations *s_export_op;
1da177e4
LT
1042 unsigned long s_flags;
1043 unsigned long s_magic;
1044 struct dentry *s_root;
1045 struct rw_semaphore s_umount;
7892f2f4 1046 struct mutex s_lock;
1da177e4
LT
1047 int s_count;
1048 int s_syncing;
1049 int s_need_sync_fs;
1050 atomic_t s_active;
50462062 1051#ifdef CONFIG_SECURITY
1da177e4 1052 void *s_security;
50462062 1053#endif
1da177e4
LT
1054 struct xattr_handler **s_xattr;
1055
1056 struct list_head s_inodes; /* all inodes */
1057 struct list_head s_dirty; /* dirty inodes */
1058 struct list_head s_io; /* parked for writeback */
0e0f4fc2 1059 struct list_head s_more_io; /* parked for more writeback */
1da177e4
LT
1060 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1061 struct list_head s_files;
1062
1063 struct block_device *s_bdev;
acaebfd8 1064 struct mtd_info *s_mtd;
1da177e4
LT
1065 struct list_head s_instances;
1066 struct quota_info s_dquot; /* Diskquota specific options */
1067
1068 int s_frozen;
1069 wait_queue_head_t s_wait_unfrozen;
1070
1071 char s_id[32]; /* Informational name */
1072
1073 void *s_fs_info; /* Filesystem private info */
1074
1075 /*
1076 * The next field is for VFS *only*. No filesystems have any business
1077 * even looking at it. You had been warned.
1078 */
a11f3a05 1079 struct mutex s_vfs_rename_mutex; /* Kludge */
1da177e4 1080
8ba8e95e 1081 /* Granularity of c/m/atime in ns.
1da177e4
LT
1082 Cannot be worse than a second */
1083 u32 s_time_gran;
79c0b2df
MS
1084
1085 /*
1086 * Filesystem subtype. If non-empty the filesystem type field
1087 * in /proc/mounts will be "type.subtype"
1088 */
1089 char *s_subtype;
b3b304a2
MS
1090
1091 /*
1092 * Saved mount options for lazy filesystems using
1093 * generic_show_options()
1094 */
1095 char *s_options;
1da177e4
LT
1096};
1097
1098extern struct timespec current_fs_time(struct super_block *sb);
1099
1100/*
1101 * Snapshotting support.
1102 */
1103enum {
1104 SB_UNFROZEN = 0,
1105 SB_FREEZE_WRITE = 1,
1106 SB_FREEZE_TRANS = 2,
1107};
1108
1109#define vfs_check_frozen(sb, level) \
1110 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1111
914e2637
AV
1112#define get_fs_excl() atomic_inc(&current->fs_excl)
1113#define put_fs_excl() atomic_dec(&current->fs_excl)
1114#define has_fs_excl() atomic_read(&current->fs_excl)
22e2c507 1115
3bd858ab
SS
1116#define is_owner_or_cap(inode) \
1117 ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
1118
914e2637
AV
1119/* not quite ready to be deprecated, but... */
1120extern void lock_super(struct super_block *);
1121extern void unlock_super(struct super_block *);
1da177e4
LT
1122
1123/*
1124 * VFS helper functions..
1125 */
e4543edd 1126extern int vfs_permission(struct nameidata *, int);
1da177e4
LT
1127extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1128extern int vfs_mkdir(struct inode *, struct dentry *, int);
1129extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
1130extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
1131extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1132extern int vfs_rmdir(struct inode *, struct dentry *);
1133extern int vfs_unlink(struct inode *, struct dentry *);
1134extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1135
1136/*
1137 * VFS dentry helper functions.
1138 */
1139extern void dentry_unhash(struct dentry *dentry);
1140
8c744fb8
CH
1141/*
1142 * VFS file helper functions.
1143 */
1144extern int file_permission(struct file *, int);
1145
1da177e4
LT
1146/*
1147 * File types
1148 *
1149 * NOTE! These match bits 12..15 of stat.st_mode
1150 * (ie "(i_mode >> 12) & 15").
1151 */
1152#define DT_UNKNOWN 0
1153#define DT_FIFO 1
1154#define DT_CHR 2
1155#define DT_DIR 4
1156#define DT_BLK 6
1157#define DT_REG 8
1158#define DT_LNK 10
1159#define DT_SOCK 12
1160#define DT_WHT 14
1161
1162#define OSYNC_METADATA (1<<0)
1163#define OSYNC_DATA (1<<1)
1164#define OSYNC_INODE (1<<2)
1165int generic_osync_inode(struct inode *, struct address_space *, int);
1166
1167/*
1168 * This is the "filldir" function type, used by readdir() to let
1169 * the kernel specify what kind of dirent layout it wants to have.
1170 * This allows the kernel to read directories into kernel space or
1171 * to have different dirent layouts depending on the binary type.
1172 */
afefdbb2 1173typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1da177e4
LT
1174
1175struct block_device_operations {
1176 int (*open) (struct inode *, struct file *);
1177 int (*release) (struct inode *, struct file *);
1178 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
bb93e3a5 1179 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
1da177e4 1180 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
420edbcc 1181 int (*direct_access) (struct block_device *, sector_t, unsigned long *);
1da177e4
LT
1182 int (*media_changed) (struct gendisk *);
1183 int (*revalidate_disk) (struct gendisk *);
a885c8c4 1184 int (*getgeo)(struct block_device *, struct hd_geometry *);
1da177e4
LT
1185 struct module *owner;
1186};
1187
1188/*
d96e6e71 1189 * "descriptor" for what we're up to with a read.
1da177e4
LT
1190 * This allows us to use the same read code yet
1191 * have multiple different users of the data that
1192 * we read from a file.
1193 *
1194 * The simplest case just copies the data to user
1195 * mode.
1196 */
1197typedef struct {
1198 size_t written;
1199 size_t count;
1200 union {
1201 char __user * buf;
1202 void *data;
1203 } arg;
1204 int error;
1205} read_descriptor_t;
1206
1207typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
1208
1209/* These macros are for out of kernel modules to test that
1210 * the kernel supports the unlocked_ioctl and compat_ioctl
1211 * fields in struct file_operations. */
1212#define HAVE_COMPAT_IOCTL 1
1213#define HAVE_UNLOCKED_IOCTL 1
1214
1215/*
1216 * NOTE:
1217 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1218 * can be called without the big kernel lock held in all filesystems.
1219 */
1220struct file_operations {
1221 struct module *owner;
1222 loff_t (*llseek) (struct file *, loff_t, int);
1223 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1da177e4 1224 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
027445c3
BP
1225 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1226 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1da177e4
LT
1227 int (*readdir) (struct file *, void *, filldir_t);
1228 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1229 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1230 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1231 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1232 int (*mmap) (struct file *, struct vm_area_struct *);
1233 int (*open) (struct inode *, struct file *);
75e1fcc0 1234 int (*flush) (struct file *, fl_owner_t id);
1da177e4
LT
1235 int (*release) (struct inode *, struct file *);
1236 int (*fsync) (struct file *, struct dentry *, int datasync);
1237 int (*aio_fsync) (struct kiocb *, int datasync);
1238 int (*fasync) (int, struct file *, int);
1239 int (*lock) (struct file *, int, struct file_lock *);
1da177e4
LT
1240 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1241 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1242 int (*check_flags)(int);
1243 int (*dir_notify)(struct file *filp, unsigned long arg);
1244 int (*flock) (struct file *, int, struct file_lock *);
cbb7e577
JA
1245 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1246 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
f9ffed26 1247 int (*setlease)(struct file *, long, struct file_lock **);
1da177e4
LT
1248};
1249
1250struct inode_operations {
1251 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1252 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1253 int (*link) (struct dentry *,struct inode *,struct dentry *);
1254 int (*unlink) (struct inode *,struct dentry *);
1255 int (*symlink) (struct inode *,struct dentry *,const char *);
1256 int (*mkdir) (struct inode *,struct dentry *,int);
1257 int (*rmdir) (struct inode *,struct dentry *);
1258 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1259 int (*rename) (struct inode *, struct dentry *,
1260 struct inode *, struct dentry *);
1261 int (*readlink) (struct dentry *, char __user *,int);
cc314eef
LT
1262 void * (*follow_link) (struct dentry *, struct nameidata *);
1263 void (*put_link) (struct dentry *, struct nameidata *, void *);
1da177e4
LT
1264 void (*truncate) (struct inode *);
1265 int (*permission) (struct inode *, int, struct nameidata *);
1266 int (*setattr) (struct dentry *, struct iattr *);
1267 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1268 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1269 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1270 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1271 int (*removexattr) (struct dentry *, const char *);
f6b3ec23 1272 void (*truncate_range)(struct inode *, loff_t, loff_t);
97ac7350
AA
1273 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1274 loff_t len);
1da177e4
LT
1275};
1276
1277struct seq_file;
1278
eed4e51f
BP
1279ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1280 unsigned long nr_segs, unsigned long fast_segs,
1281 struct iovec *fast_pointer,
1282 struct iovec **ret_pointer);
1283
1da177e4
LT
1284extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1285extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1286extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1287 unsigned long, loff_t *);
1288extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1289 unsigned long, loff_t *);
1290
1291/*
1292 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1293 * without the big kernel lock held in all filesystems.
1294 */
1295struct super_operations {
1296 struct inode *(*alloc_inode)(struct super_block *sb);
1297 void (*destroy_inode)(struct inode *);
1298
1da177e4
LT
1299 void (*dirty_inode) (struct inode *);
1300 int (*write_inode) (struct inode *, int);
1301 void (*put_inode) (struct inode *);
1302 void (*drop_inode) (struct inode *);
1303 void (*delete_inode) (struct inode *);
1304 void (*put_super) (struct super_block *);
1305 void (*write_super) (struct super_block *);
1306 int (*sync_fs)(struct super_block *sb, int wait);
1307 void (*write_super_lockfs) (struct super_block *);
1308 void (*unlockfs) (struct super_block *);
726c3342 1309 int (*statfs) (struct dentry *, struct kstatfs *);
1da177e4
LT
1310 int (*remount_fs) (struct super_block *, int *, char *);
1311 void (*clear_inode) (struct inode *);
8b512d9a 1312 void (*umount_begin) (struct vfsmount *, int);
1da177e4
LT
1313
1314 int (*show_options)(struct seq_file *, struct vfsmount *);
b4629fe2 1315 int (*show_stats)(struct seq_file *, struct vfsmount *);
0e51a720 1316#ifdef CONFIG_QUOTA
1da177e4
LT
1317 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1318 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
0e51a720 1319#endif
1da177e4
LT
1320};
1321
1c0eeaf5
JE
1322/*
1323 * Inode state bits. Protected by inode_lock.
1324 *
1325 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1326 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1327 *
1328 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1329 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1330 * various stages of removing an inode.
1331 *
1332 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1333 *
e7ca2d41
JE
1334 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1335 * fdatasync(). i_atime is the usual cause.
000cb48e
JK
1336 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1337 * these changes separately from I_DIRTY_SYNC so that we
1338 * don't have to write inode on fdatasync() when only
1339 * mtime has changed in it.
1c0eeaf5
JE
1340 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1341 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1342 * are cleared by unlock_new_inode(), called from iget().
1343 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1344 * is zero. I_FREEING must be set when I_WILL_FREE is
1345 * cleared.
1346 * I_FREEING Set when inode is about to be freed but still has dirty
1347 * pages or buffers attached or the inode itself is still
1348 * dirty.
1349 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1350 * and can be destroyed.
1351 *
1352 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1353 * prohibited for many purposes. iget() must wait for
1354 * the inode to be completely released, then create it
1355 * anew. Other functions will just ignore such inodes,
1356 * if appropriate. I_LOCK is used for waiting.
1357 *
1358 * I_LOCK Serves as both a mutex and completion notification.
1359 * New inodes set I_LOCK. If two processes both create
1360 * the same inode, one of them will release its inode and
1361 * wait for I_LOCK to be released before returning.
1362 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1363 * also cause waiting on I_LOCK, without I_LOCK actually
1364 * being set. find_inode() uses this to prevent returning
1365 * nearly-dead inodes.
1366 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
fd3f8984 1367 * of inode dirty data. Having a separate lock for this
1c0eeaf5
JE
1368 * purpose reduces latency and prevents some filesystem-
1369 * specific deadlocks.
1370 *
1c0eeaf5
JE
1371 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1372 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1373 * I_CLEAR? If not, why?
1374 */
1375#define I_DIRTY_SYNC 1
1376#define I_DIRTY_DATASYNC 2
1377#define I_DIRTY_PAGES 4
1378#define I_NEW 8
1379#define I_WILL_FREE 16
1380#define I_FREEING 32
1381#define I_CLEAR 64
1382#define __I_LOCK 7
1da177e4 1383#define I_LOCK (1 << __I_LOCK)
1c0eeaf5
JE
1384#define __I_SYNC 8
1385#define I_SYNC (1 << __I_SYNC)
1da177e4
LT
1386
1387#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1388
1389extern void __mark_inode_dirty(struct inode *, int);
1390static inline void mark_inode_dirty(struct inode *inode)
1391{
1392 __mark_inode_dirty(inode, I_DIRTY);
1393}
1394
1395static inline void mark_inode_dirty_sync(struct inode *inode)
1396{
1397 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1398}
1399
71c42157
DH
1400/**
1401 * inc_nlink - directly increment an inode's link count
1402 * @inode: inode
1403 *
1404 * This is a low-level filesystem helper to replace any
1405 * direct filesystem manipulation of i_nlink. Currently,
1406 * it is only here for parity with dec_nlink().
1407 */
d8c76e6f 1408static inline void inc_nlink(struct inode *inode)
66d21730
AD
1409{
1410 inode->i_nlink++;
d8c76e6f
DH
1411}
1412
1413static inline void inode_inc_link_count(struct inode *inode)
1414{
1415 inc_nlink(inode);
66d21730
AD
1416 mark_inode_dirty(inode);
1417}
1418
71c42157
DH
1419/**
1420 * drop_nlink - directly drop an inode's link count
1421 * @inode: inode
1422 *
1423 * This is a low-level filesystem helper to replace any
1424 * direct filesystem manipulation of i_nlink. In cases
1425 * where we are attempting to track writes to the
1426 * filesystem, a decrement to zero means an imminent
1427 * write when the file is truncated and actually unlinked
1428 * on the filesystem.
1429 */
9a53c3a7 1430static inline void drop_nlink(struct inode *inode)
66d21730
AD
1431{
1432 inode->i_nlink--;
9a53c3a7
DH
1433}
1434
71c42157
DH
1435/**
1436 * clear_nlink - directly zero an inode's link count
1437 * @inode: inode
1438 *
1439 * This is a low-level filesystem helper to replace any
1440 * direct filesystem manipulation of i_nlink. See
1441 * drop_nlink() for why we care about i_nlink hitting zero.
1442 */
ce71ec36
DH
1443static inline void clear_nlink(struct inode *inode)
1444{
1445 inode->i_nlink = 0;
1446}
1447
9a53c3a7
DH
1448static inline void inode_dec_link_count(struct inode *inode)
1449{
1450 drop_nlink(inode);
66d21730
AD
1451 mark_inode_dirty(inode);
1452}
1453
25ec56b5
JNC
1454/**
1455 * inode_inc_iversion - increments i_version
1456 * @inode: inode that need to be updated
1457 *
1458 * Every time the inode is modified, the i_version field will be incremented.
1459 * The filesystem has to be mounted with i_version flag
1460 */
1461
1462static inline void inode_inc_iversion(struct inode *inode)
1463{
1464 spin_lock(&inode->i_lock);
1465 inode->i_version++;
1466 spin_unlock(&inode->i_lock);
1467}
1468
869243a0 1469extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
1da177e4
LT
1470static inline void file_accessed(struct file *file)
1471{
1472 if (!(file->f_flags & O_NOATIME))
0f7fc9e4 1473 touch_atime(file->f_path.mnt, file->f_path.dentry);
1da177e4
LT
1474}
1475
1476int sync_inode(struct inode *inode, struct writeback_control *wbc);
1477
1da177e4
LT
1478struct file_system_type {
1479 const char *name;
1480 int fs_flags;
454e2398
DH
1481 int (*get_sb) (struct file_system_type *, int,
1482 const char *, void *, struct vfsmount *);
1da177e4
LT
1483 void (*kill_sb) (struct super_block *);
1484 struct module *owner;
1485 struct file_system_type * next;
1486 struct list_head fs_supers;
d475fd42 1487
cf516249 1488 struct lock_class_key s_lock_key;
897c6ff9 1489 struct lock_class_key s_umount_key;
d475fd42
PZ
1490
1491 struct lock_class_key i_lock_key;
1492 struct lock_class_key i_mutex_key;
14358e6d 1493 struct lock_class_key i_mutex_dir_key;
d475fd42 1494 struct lock_class_key i_alloc_sem_key;
1da177e4
LT
1495};
1496
454e2398 1497extern int get_sb_bdev(struct file_system_type *fs_type,
1da177e4 1498 int flags, const char *dev_name, void *data,
454e2398
DH
1499 int (*fill_super)(struct super_block *, void *, int),
1500 struct vfsmount *mnt);
1501extern int get_sb_single(struct file_system_type *fs_type,
1da177e4 1502 int flags, void *data,
454e2398
DH
1503 int (*fill_super)(struct super_block *, void *, int),
1504 struct vfsmount *mnt);
1505extern int get_sb_nodev(struct file_system_type *fs_type,
1da177e4 1506 int flags, void *data,
454e2398
DH
1507 int (*fill_super)(struct super_block *, void *, int),
1508 struct vfsmount *mnt);
1da177e4
LT
1509void generic_shutdown_super(struct super_block *sb);
1510void kill_block_super(struct super_block *sb);
1511void kill_anon_super(struct super_block *sb);
1512void kill_litter_super(struct super_block *sb);
1513void deactivate_super(struct super_block *sb);
1514int set_anon_super(struct super_block *s, void *data);
1515struct super_block *sget(struct file_system_type *type,
1516 int (*test)(struct super_block *,void *),
1517 int (*set)(struct super_block *,void *),
1518 void *data);
454e2398 1519extern int get_sb_pseudo(struct file_system_type *, char *,
ee9b6d61 1520 const struct super_operations *ops, unsigned long,
454e2398
DH
1521 struct vfsmount *mnt);
1522extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
1da177e4
LT
1523int __put_super(struct super_block *sb);
1524int __put_super_and_need_restart(struct super_block *sb);
1525void unnamed_dev_init(void);
1526
1527/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1528#define fops_get(fops) \
1529 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1530#define fops_put(fops) \
1531 do { if (fops) module_put((fops)->owner); } while(0)
1532
1533extern int register_filesystem(struct file_system_type *);
1534extern int unregister_filesystem(struct file_system_type *);
8bf9725c
PE
1535extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1536#define kern_mount(type) kern_mount_data(type, NULL)
1da177e4
LT
1537extern int may_umount_tree(struct vfsmount *);
1538extern int may_umount(struct vfsmount *);
1539extern long do_mount(char *, char *, char *, unsigned long, void *);
8aec0809
AV
1540extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *);
1541extern void drop_collected_mounts(struct vfsmount *);
1da177e4 1542
726c3342 1543extern int vfs_statfs(struct dentry *, struct kstatfs *);
1da177e4 1544
f87fd4c2 1545/* /sys/fs */
00d26666 1546extern struct kobject *fs_kobj;
f87fd4c2 1547
1da177e4
LT
1548#define FLOCK_VERIFY_READ 1
1549#define FLOCK_VERIFY_WRITE 2
1550
1551extern int locks_mandatory_locked(struct inode *);
1552extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1553
1554/*
1555 * Candidates for mandatory locking have the setgid bit set
1556 * but no group execute bit - an otherwise meaningless combination.
1557 */
a16877ca
PE
1558
1559static inline int __mandatory_lock(struct inode *ino)
1560{
1561 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1562}
1563
1564/*
1565 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1566 * otherwise these will be advisory locks
1567 */
1568
1569static inline int mandatory_lock(struct inode *ino)
1570{
1571 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1572}
1da177e4
LT
1573
1574static inline int locks_verify_locked(struct inode *inode)
1575{
a16877ca 1576 if (mandatory_lock(inode))
1da177e4
LT
1577 return locks_mandatory_locked(inode);
1578 return 0;
1579}
1580
1581extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1582
1583static inline int locks_verify_truncate(struct inode *inode,
1584 struct file *filp,
1585 loff_t size)
1586{
a16877ca 1587 if (inode->i_flock && mandatory_lock(inode))
1da177e4
LT
1588 return locks_mandatory_area(
1589 FLOCK_VERIFY_WRITE, inode, filp,
1590 size < inode->i_size ? size : inode->i_size,
1591 (size < inode->i_size ? inode->i_size - size
1592 : size - inode->i_size)
1593 );
1594 return 0;
1595}
1596
1597static inline int break_lease(struct inode *inode, unsigned int mode)
1598{
1599 if (inode->i_flock)
1600 return __break_lease(inode, mode);
1601 return 0;
1602}
1603
1604/* fs/open.c */
1605
4a30131e
N
1606extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1607 struct file *filp);
8e8a1407 1608extern long do_sys_open(int dfd, const char __user *filename, int flags,
5590ff0d 1609 int mode);
1da177e4
LT
1610extern struct file *filp_open(const char *, int, int);
1611extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1612extern int filp_close(struct file *, fl_owner_t id);
1613extern char * getname(const char __user *);
1614
1615/* fs/dcache.c */
1616extern void __init vfs_caches_init_early(void);
1617extern void __init vfs_caches_init(unsigned long);
1618
b86c089b
CL
1619extern struct kmem_cache *names_cachep;
1620
e94b1766 1621#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
1da177e4
LT
1622#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1623#ifndef CONFIG_AUDITSYSCALL
1624#define putname(name) __putname(name)
1625#else
1626extern void putname(const char *name);
1627#endif
1628
9361401e 1629#ifdef CONFIG_BLOCK
1da177e4 1630extern int register_blkdev(unsigned int, const char *);
f4480240 1631extern void unregister_blkdev(unsigned int, const char *);
1da177e4
LT
1632extern struct block_device *bdget(dev_t);
1633extern void bd_set_size(struct block_device *, loff_t size);
1634extern void bd_forget(struct inode *inode);
1635extern void bdput(struct block_device *);
1636extern struct block_device *open_by_devnum(dev_t, unsigned);
9361401e
DH
1637#else
1638static inline void bd_forget(struct inode *inode) {}
1639#endif
1640extern const struct file_operations def_blk_fops;
4b6f5d20
AV
1641extern const struct file_operations def_chr_fops;
1642extern const struct file_operations bad_sock_fops;
1643extern const struct file_operations def_fifo_fops;
9361401e 1644#ifdef CONFIG_BLOCK
1da177e4
LT
1645extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1646extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
7006f6ec
AK
1647extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
1648 struct gendisk *disk, unsigned cmd,
1649 unsigned long arg);
1da177e4
LT
1650extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1651extern int blkdev_get(struct block_device *, mode_t, unsigned);
1652extern int blkdev_put(struct block_device *);
1653extern int bd_claim(struct block_device *, void *);
1654extern void bd_release(struct block_device *);
641dc636
JN
1655#ifdef CONFIG_SYSFS
1656extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1657extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1658#else
1659#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1660#define bd_release_from_disk(bdev, disk) bd_release(bdev)
1661#endif
9361401e 1662#endif
1da177e4
LT
1663
1664/* fs/char_dev.c */
68eef3b4 1665#define CHRDEV_MAJOR_HASH_SIZE 255
1da177e4
LT
1666extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1667extern int register_chrdev_region(dev_t, unsigned, const char *);
1668extern int register_chrdev(unsigned int, const char *,
99ac48f5 1669 const struct file_operations *);
e53252d9 1670extern void unregister_chrdev(unsigned int, const char *);
1da177e4 1671extern void unregister_chrdev_region(dev_t, unsigned);
68eef3b4 1672extern void chrdev_show(struct seq_file *,off_t);
1da177e4
LT
1673
1674/* fs/block_dev.c */
1675#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
9361401e
DH
1676
1677#ifdef CONFIG_BLOCK
1678#define BLKDEV_MAJOR_HASH_SIZE 255
1da177e4
LT
1679extern const char *__bdevname(dev_t, char *buffer);
1680extern const char *bdevname(struct block_device *bdev, char *buffer);
1681extern struct block_device *lookup_bdev(const char *);
1682extern struct block_device *open_bdev_excl(const char *, int, void *);
1683extern void close_bdev_excl(struct block_device *);
68eef3b4 1684extern void blkdev_show(struct seq_file *,off_t);
9361401e
DH
1685#else
1686#define BLKDEV_MAJOR_HASH_SIZE 0
1687#endif
1da177e4
LT
1688
1689extern void init_special_inode(struct inode *, umode_t, dev_t);
1690
1691/* Invalid inode operations -- fs/bad_inode.c */
1692extern void make_bad_inode(struct inode *);
1693extern int is_bad_inode(struct inode *);
1694
4b6f5d20
AV
1695extern const struct file_operations read_fifo_fops;
1696extern const struct file_operations write_fifo_fops;
1697extern const struct file_operations rdwr_fifo_fops;
1da177e4
LT
1698
1699extern int fs_may_remount_ro(struct super_block *);
1700
9361401e 1701#ifdef CONFIG_BLOCK
1da177e4
LT
1702/*
1703 * return READ, READA, or WRITE
1704 */
1705#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1706
1707/*
1708 * return data direction, READ or WRITE
1709 */
1710#define bio_data_dir(bio) ((bio)->bi_rw & 1)
1711
1712extern int check_disk_change(struct block_device *);
2ef41634 1713extern int __invalidate_device(struct block_device *);
1da177e4 1714extern int invalidate_partition(struct gendisk *, int);
9361401e
DH
1715#endif
1716extern int invalidate_inodes(struct super_block *);
fc9a07e7
AM
1717unsigned long __invalidate_mapping_pages(struct address_space *mapping,
1718 pgoff_t start, pgoff_t end,
1719 bool be_atomic);
1da177e4
LT
1720unsigned long invalidate_mapping_pages(struct address_space *mapping,
1721 pgoff_t start, pgoff_t end);
54bc4855 1722
fc0ecff6 1723static inline unsigned long __deprecated
54bc4855
AA
1724invalidate_inode_pages(struct address_space *mapping)
1725{
1726 return invalidate_mapping_pages(mapping, 0, ~0UL);
1727}
1728
1da177e4
LT
1729static inline void invalidate_remote_inode(struct inode *inode)
1730{
1731 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1732 S_ISLNK(inode->i_mode))
fc0ecff6 1733 invalidate_mapping_pages(inode->i_mapping, 0, -1);
1da177e4
LT
1734}
1735extern int invalidate_inode_pages2(struct address_space *mapping);
1736extern int invalidate_inode_pages2_range(struct address_space *mapping,
1737 pgoff_t start, pgoff_t end);
1738extern int write_inode_now(struct inode *, int);
1739extern int filemap_fdatawrite(struct address_space *);
1740extern int filemap_flush(struct address_space *);
1741extern int filemap_fdatawait(struct address_space *);
1742extern int filemap_write_and_wait(struct address_space *mapping);
1743extern int filemap_write_and_wait_range(struct address_space *mapping,
1744 loff_t lstart, loff_t lend);
ebcf28e1
AM
1745extern int wait_on_page_writeback_range(struct address_space *mapping,
1746 pgoff_t start, pgoff_t end);
1747extern int __filemap_fdatawrite_range(struct address_space *mapping,
1748 loff_t start, loff_t end, int sync_mode);
1749
18e79b40 1750extern long do_fsync(struct file *file, int datasync);
1da177e4
LT
1751extern void sync_supers(void);
1752extern void sync_filesystems(int wait);
cf9a2ae8 1753extern void __fsync_super(struct super_block *sb);
1da177e4
LT
1754extern void emergency_sync(void);
1755extern void emergency_remount(void);
1756extern int do_remount_sb(struct super_block *sb, int flags,
1757 void *data, int force);
9361401e 1758#ifdef CONFIG_BLOCK
1da177e4 1759extern sector_t bmap(struct inode *, sector_t);
9361401e 1760#endif
1da177e4
LT
1761extern int notify_change(struct dentry *, struct iattr *);
1762extern int permission(struct inode *, int, struct nameidata *);
1763extern int generic_permission(struct inode *, int,
1764 int (*check_acl)(struct inode *, int));
1765
1766extern int get_write_access(struct inode *);
1767extern int deny_write_access(struct file *);
1768static inline void put_write_access(struct inode * inode)
1769{
1770 atomic_dec(&inode->i_writecount);
1771}
1772static inline void allow_write_access(struct file *file)
1773{
1774 if (file)
0f7fc9e4 1775 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
1da177e4
LT
1776}
1777extern int do_pipe(int *);
d6cbd281
AK
1778extern struct file *create_read_pipe(struct file *f);
1779extern struct file *create_write_pipe(void);
1780extern void free_write_pipe(struct file *);
1da177e4 1781
a70e65df
CH
1782extern struct file *do_filp_open(int dfd, const char *pathname,
1783 int open_flag, int mode);
1da177e4
LT
1784extern int may_open(struct nameidata *, int, int);
1785
1786extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1787extern struct file * open_exec(const char *);
1788
1789/* fs/dcache.c -- generic fs support functions */
1790extern int is_subdir(struct dentry *, struct dentry *);
1791extern ino_t find_inode_number(struct dentry *, struct qstr *);
1792
1793#include <linux/err.h>
1794
1795/* needed for stackable file system support */
1796extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1797
1798extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1799
1800extern void inode_init_once(struct inode *);
1801extern void iput(struct inode *);
1802extern struct inode * igrab(struct inode *);
1803extern ino_t iunique(struct super_block *, ino_t);
1804extern int inode_needs_sync(struct inode *inode);
1805extern void generic_delete_inode(struct inode *inode);
cb2c0233 1806extern void generic_drop_inode(struct inode *inode);
1da177e4 1807
88bd5121
AA
1808extern struct inode *ilookup5_nowait(struct super_block *sb,
1809 unsigned long hashval, int (*test)(struct inode *, void *),
1810 void *data);
1da177e4
LT
1811extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1812 int (*test)(struct inode *, void *), void *data);
1813extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1814
1815extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1816extern struct inode * iget_locked(struct super_block *, unsigned long);
1817extern void unlock_new_inode(struct inode *);
1818
1da177e4 1819extern void __iget(struct inode * inode);
b46980fe 1820extern void iget_failed(struct inode *);
1da177e4
LT
1821extern void clear_inode(struct inode *);
1822extern void destroy_inode(struct inode *);
1823extern struct inode *new_inode(struct super_block *);
01de85e0
JA
1824extern int __remove_suid(struct dentry *, int);
1825extern int should_remove_suid(struct dentry *);
1da177e4 1826extern int remove_suid(struct dentry *);
1da177e4
LT
1827
1828extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1829extern void remove_inode_hash(struct inode *);
1830static inline void insert_inode_hash(struct inode *inode) {
1831 __insert_inode_hash(inode, inode->i_ino);
1832}
1833
1834extern struct file * get_empty_filp(void);
1835extern void file_move(struct file *f, struct list_head *list);
1836extern void file_kill(struct file *f);
9361401e 1837#ifdef CONFIG_BLOCK
1da177e4
LT
1838struct bio;
1839extern void submit_bio(int, struct bio *);
1840extern int bdev_read_only(struct block_device *);
9361401e 1841#endif
1da177e4
LT
1842extern int set_blocksize(struct block_device *, int);
1843extern int sb_set_blocksize(struct super_block *, int);
1844extern int sb_min_blocksize(struct super_block *, int);
08d8e974 1845extern int sb_has_dirty_inodes(struct super_block *);
1da177e4
LT
1846
1847extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1848extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1849extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1da177e4 1850int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
027445c3 1851extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
027445c3 1852extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1da177e4 1853extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
027445c3 1854 unsigned long, loff_t);
1da177e4
LT
1855extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1856 unsigned long *, loff_t, loff_t *, size_t, size_t);
1857extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1858 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1859extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1860extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
0ceb3314
DM
1861extern int generic_segment_checks(const struct iovec *iov,
1862 unsigned long *nr_segs, size_t *count, int access_flags);
88e6faef
AM
1863
1864/* fs/splice.c */
cbb7e577 1865extern ssize_t generic_file_splice_read(struct file *, loff_t *,
88e6faef
AM
1866 struct pipe_inode_info *, size_t, unsigned int);
1867extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
cbb7e577 1868 struct file *, loff_t *, size_t, unsigned int);
6da61809
MF
1869extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1870 struct file *, loff_t *, size_t, unsigned int);
88e6faef 1871extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
cbb7e577
JA
1872 struct file *out, loff_t *, size_t len, unsigned int flags);
1873extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
88e6faef
AM
1874 size_t len, unsigned int flags);
1875
1da177e4
LT
1876extern void
1877file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1da177e4
LT
1878extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1879extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1880extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1881extern int generic_file_open(struct inode * inode, struct file * filp);
1882extern int nonseekable_open(struct inode * inode, struct file * filp);
1883
ceffc078 1884#ifdef CONFIG_FS_XIP
eb6fe0c3
CO
1885extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1886 loff_t *ppos);
ceffc078 1887extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
eb6fe0c3
CO
1888extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1889 size_t len, loff_t *ppos);
ceffc078 1890extern int xip_truncate_page(struct address_space *mapping, loff_t from);
6d79125b
CO
1891#else
1892static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1893{
1894 return 0;
1895}
ceffc078
CO
1896#endif
1897
9361401e 1898#ifdef CONFIG_BLOCK
1da177e4
LT
1899ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1900 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1d8fa7a2 1901 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
1da177e4
LT
1902 int lock_type);
1903
1904enum {
1905 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1906 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1907 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1908};
1909
1910static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1911 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1d8fa7a2 1912 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1da177e4
LT
1913 dio_iodone_t end_io)
1914{
1915 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1d8fa7a2 1916 nr_segs, get_block, end_io, DIO_LOCKING);
1da177e4
LT
1917}
1918
1919static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1920 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1d8fa7a2 1921 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1da177e4
LT
1922 dio_iodone_t end_io)
1923{
1924 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1d8fa7a2 1925 nr_segs, get_block, end_io, DIO_NO_LOCKING);
1da177e4
LT
1926}
1927
1928static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1929 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1d8fa7a2 1930 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1da177e4
LT
1931 dio_iodone_t end_io)
1932{
1933 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1d8fa7a2 1934 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
1da177e4 1935}
9361401e 1936#endif
1da177e4 1937
4b6f5d20 1938extern const struct file_operations generic_ro_fops;
1da177e4
LT
1939
1940#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1941
1942extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1943extern int vfs_follow_link(struct nameidata *, const char *);
1944extern int page_readlink(struct dentry *, char __user *, int);
cc314eef
LT
1945extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1946extern void page_put_link(struct dentry *, struct nameidata *, void *);
0adb25d2
KK
1947extern int __page_symlink(struct inode *inode, const char *symname, int len,
1948 gfp_t gfp_mask);
1da177e4 1949extern int page_symlink(struct inode *inode, const char *symname, int len);
c5ef1c42 1950extern const struct inode_operations page_symlink_inode_operations;
1da177e4
LT
1951extern int generic_readlink(struct dentry *, char __user *, int);
1952extern void generic_fillattr(struct inode *, struct kstat *);
1953extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1954void inode_add_bytes(struct inode *inode, loff_t bytes);
1955void inode_sub_bytes(struct inode *inode, loff_t bytes);
1956loff_t inode_get_bytes(struct inode *inode);
1957void inode_set_bytes(struct inode *inode, loff_t bytes);
1958
1959extern int vfs_readdir(struct file *, filldir_t, void *);
1960
1961extern int vfs_stat(char __user *, struct kstat *);
1962extern int vfs_lstat(char __user *, struct kstat *);
5590ff0d
UD
1963extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
1964extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
1da177e4
LT
1965extern int vfs_fstat(unsigned int, struct kstat *);
1966
deb21db7
EZ
1967extern long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
1968extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
1969 unsigned long arg);
1da177e4 1970
c18479fe
MS
1971extern void get_filesystem(struct file_system_type *fs);
1972extern void put_filesystem(struct file_system_type *fs);
1da177e4
LT
1973extern struct file_system_type *get_fs_type(const char *name);
1974extern struct super_block *get_super(struct block_device *);
1975extern struct super_block *user_get_super(dev_t);
1976extern void drop_super(struct super_block *sb);
1977
1978extern int dcache_dir_open(struct inode *, struct file *);
1979extern int dcache_dir_close(struct inode *, struct file *);
1980extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1981extern int dcache_readdir(struct file *, void *, filldir_t);
1982extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
726c3342 1983extern int simple_statfs(struct dentry *, struct kstatfs *);
1da177e4
LT
1984extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1985extern int simple_unlink(struct inode *, struct dentry *);
1986extern int simple_rmdir(struct inode *, struct dentry *);
1987extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1988extern int simple_sync_file(struct file *, struct dentry *, int);
1989extern int simple_empty(struct dentry *);
1990extern int simple_readpage(struct file *file, struct page *page);
1991extern int simple_prepare_write(struct file *file, struct page *page,
1992 unsigned offset, unsigned to);
afddba49
NP
1993extern int simple_write_begin(struct file *file, struct address_space *mapping,
1994 loff_t pos, unsigned len, unsigned flags,
1995 struct page **pagep, void **fsdata);
1996extern int simple_write_end(struct file *file, struct address_space *mapping,
1997 loff_t pos, unsigned len, unsigned copied,
1998 struct page *page, void *fsdata);
1da177e4
LT
1999
2000extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
2001extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
4b6f5d20 2002extern const struct file_operations simple_dir_operations;
c5ef1c42 2003extern const struct inode_operations simple_dir_inode_operations;
4b6f5d20 2004struct tree_descr { char *name; const struct file_operations *ops; int mode; };
1da177e4
LT
2005struct dentry *d_alloc_name(struct dentry *, const char *);
2006extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1f5ce9e9 2007extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
1da177e4
LT
2008extern void simple_release_fs(struct vfsmount **mount, int *count);
2009
2010extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
2011
e965f963 2012#ifdef CONFIG_MIGRATION
2d1db3b1
CL
2013extern int buffer_migrate_page(struct address_space *,
2014 struct page *, struct page *);
e965f963
CL
2015#else
2016#define buffer_migrate_page NULL
2017#endif
2018
1da177e4
LT
2019extern int inode_change_ok(struct inode *, struct iattr *);
2020extern int __must_check inode_setattr(struct inode *, struct iattr *);
2021
870f4817 2022extern void file_update_time(struct file *file);
1da177e4 2023
b3b304a2
MS
2024extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2025extern void save_mount_options(struct super_block *sb, char *options);
2026
1da177e4
LT
2027static inline ino_t parent_ino(struct dentry *dentry)
2028{
2029 ino_t res;
2030
2031 spin_lock(&dentry->d_lock);
2032 res = dentry->d_parent->d_inode->i_ino;
2033 spin_unlock(&dentry->d_lock);
2034 return res;
2035}
2036
2037/* kernel/fork.c */
2038extern int unshare_files(void);
2039
2040/* Transaction based IO helpers */
2041
2042/*
2043 * An argresp is stored in an allocated page and holds the
2044 * size of the argument or response, along with its content
2045 */
2046struct simple_transaction_argresp {
2047 ssize_t size;
2048 char data[0];
2049};
2050
2051#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2052
2053char *simple_transaction_get(struct file *file, const char __user *buf,
2054 size_t size);
2055ssize_t simple_transaction_read(struct file *file, char __user *buf,
2056 size_t size, loff_t *pos);
2057int simple_transaction_release(struct inode *inode, struct file *file);
2058
2059static inline void simple_transaction_set(struct file *file, size_t n)
2060{
2061 struct simple_transaction_argresp *ar = file->private_data;
2062
2063 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
2064
2065 /*
2066 * The barrier ensures that ar->size will really remain zero until
2067 * ar->data is ready for reading.
2068 */
2069 smp_mb();
2070 ar->size = n;
2071}
2072
acaefc25
AB
2073/*
2074 * simple attribute files
2075 *
2076 * These attributes behave similar to those in sysfs:
2077 *
2078 * Writing to an attribute immediately sets a value, an open file can be
2079 * written to multiple times.
2080 *
2081 * Reading from an attribute creates a buffer from the value that might get
2082 * read with multiple read calls. When the attribute has been read
2083 * completely, no further read calls are possible until the file is opened
2084 * again.
2085 *
2086 * All attributes contain a text representation of a numeric value
2087 * that are accessed with the get() and set() functions.
2088 */
2089#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2090static int __fops ## _open(struct inode *inode, struct file *file) \
2091{ \
2092 __simple_attr_check_format(__fmt, 0ull); \
2093 return simple_attr_open(inode, file, __get, __set, __fmt); \
2094} \
2095static struct file_operations __fops = { \
2096 .owner = THIS_MODULE, \
2097 .open = __fops ## _open, \
74bedc4d 2098 .release = simple_attr_release, \
acaefc25
AB
2099 .read = simple_attr_read, \
2100 .write = simple_attr_write, \
2101};
2102
2103static inline void __attribute__((format(printf, 1, 2)))
2104__simple_attr_check_format(const char *fmt, ...)
2105{
2106 /* don't do anything, just let the compiler check the arguments; */
2107}
2108
2109int simple_attr_open(struct inode *inode, struct file *file,
8b88b099 2110 int (*get)(void *, u64 *), int (*set)(void *, u64),
acaefc25 2111 const char *fmt);
74bedc4d 2112int simple_attr_release(struct inode *inode, struct file *file);
acaefc25
AB
2113ssize_t simple_attr_read(struct file *file, char __user *buf,
2114 size_t len, loff_t *ppos);
2115ssize_t simple_attr_write(struct file *file, const char __user *buf,
2116 size_t len, loff_t *ppos);
2117
2118
1da177e4
LT
2119#ifdef CONFIG_SECURITY
2120static inline char *alloc_secdata(void)
2121{
2122 return (char *)get_zeroed_page(GFP_KERNEL);
2123}
2124
2125static inline void free_secdata(void *secdata)
2126{
2127 free_page((unsigned long)secdata);
2128}
2129#else
2130static inline char *alloc_secdata(void)
2131{
2132 return (char *)1;
2133}
2134
2135static inline void free_secdata(void *secdata)
2136{ }
2137#endif /* CONFIG_SECURITY */
2138
4be28540
AD
2139struct ctl_table;
2140int proc_nr_files(struct ctl_table *table, int write, struct file *filp,
62239ac2
AB
2141 void __user *buffer, size_t *lenp, loff_t *ppos);
2142
011e3fcd 2143int get_filesystem_list(char * buf);
62239ac2 2144
1da177e4
LT
2145#endif /* __KERNEL__ */
2146#endif /* _LINUX_FS_H */