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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#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
Eric Dumazet9cfe0152008-02-06 01:37:16 -080024extern int sysctl_nr_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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
David Howells01bf4662006-07-10 04:44:53 -070030#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 */
Chris Snook1ae70752007-05-08 00:24:15 -070033#define SEEK_MAX SEEK_END
David Howells01bf4662006-07-10 04:44:53 -070034
Linus Torvalds1da177e2005-04-16 15:20:36 -070035/* 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;
Dipankar Sarma529bf6b2006-03-07 21:55:35 -080042extern int get_max_files(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44struct inodes_stat_t {
45 int nr_inodes;
46 int nr_unused;
Stefan Richter9e7bf242007-07-15 23:40:25 -070047 int dummy[5]; /* padding for sysctl ABI compatibility */
Linus Torvalds1da177e2005-04-16 15:20:36 -070048};
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
Al Viroe6305c42008-07-15 21:03:57 -040063#define MAY_ACCESS 16
Al Viroa1103432008-07-17 09:19:08 -040064#define MAY_OPEN 32
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66#define FMODE_READ 1
67#define FMODE_WRITE 2
68
69/* Internal kernel extensions */
70#define FMODE_LSEEK 4
71#define FMODE_PREAD 8
72#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
73
Oleg Drokinb5005312006-03-25 03:07:01 -080074/* File is being opened for execution. Primary users of this flag are
75 distributed filesystems that can use it to achieve correct ETXTBUSY
76 behavior for cross-node execution/opening_for_writing of files */
77#define FMODE_EXEC 16
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#define RW_MASK 1
80#define RWA_MASK 2
81#define READ 0
82#define WRITE 1
83#define READA 2 /* read-ahead - don't block if no resources */
Jan Karaa7662232005-09-06 15:19:10 -070084#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#define READ_SYNC (READ | (1 << BIO_RW_SYNC))
Jens Axboe5404bc72006-08-10 09:01:02 +020086#define READ_META (READ | (1 << BIO_RW_META))
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
Jens Axboe18ce3752008-07-01 09:07:34 +020088#define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC))
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
90
91#define SEL_IN 1
92#define SEL_OUT 2
93#define SEL_EX 4
94
95/* public flags for file_system_type */
96#define FS_REQUIRES_DEV 1
97#define FS_BINARY_MOUNTDATA 2
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -070098#define FS_HAS_SUBTYPE 4
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
Mark Fasheh349457c2006-09-08 14:22:21 -0700100#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
101 * during rename() internally.
102 */
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104/*
105 * These are the fs-independent mount-flags: up to 32 flags are supported
106 */
107#define MS_RDONLY 1 /* Mount read-only */
108#define MS_NOSUID 2 /* Ignore suid and sgid bits */
109#define MS_NODEV 4 /* Disallow access to device special files */
110#define MS_NOEXEC 8 /* Disallow program execution */
111#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
112#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
113#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
114#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
115#define MS_NOATIME 1024 /* Do not update access times. */
116#define MS_NODIRATIME 2048 /* Do not update directory access times */
117#define MS_BIND 4096
118#define MS_MOVE 8192
119#define MS_REC 16384
Theodore Ts'o9b04c992006-03-24 03:15:10 -0800120#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
121 MS_VERBOSE is deprecated. */
122#define MS_SILENT 32768
Miklos Szeredibf066c72006-01-08 01:03:19 -0800123#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
Ram Pai9676f0c2005-11-07 17:21:20 -0500124#define MS_UNBINDABLE (1<<17) /* change to unbindable */
Ram Pai07b20882005-11-07 17:19:07 -0500125#define MS_PRIVATE (1<<18) /* change to private */
Ram Paia58b0eb2005-11-07 17:20:48 -0500126#define MS_SLAVE (1<<19) /* change to slave */
Ram Pai03e06e62005-11-07 17:19:33 -0500127#define MS_SHARED (1<<20) /* change to shared */
Valerie Henson47ae32d2006-12-13 00:34:34 -0800128#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
Pavel Emelyanov8bf97252007-10-18 23:40:02 -0700129#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500130#define MS_I_VERSION (1<<23) /* Update inode I_version field */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#define MS_ACTIVE (1<<30)
132#define MS_NOUSER (1<<31)
133
134/*
135 * Superblock flags that can be altered by MS_REMOUNT
136 */
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -0800137#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139/*
140 * Old magic mount flag and mask
141 */
142#define MS_MGC_VAL 0xC0ED0000
143#define MS_MGC_MSK 0xffff0000
144
145/* Inode flags - they have nothing to superblock flags now */
146
147#define S_SYNC 1 /* Writes are synced at once */
148#define S_NOATIME 2 /* Do not update access times */
149#define S_APPEND 4 /* Append-only file */
150#define S_IMMUTABLE 8 /* Immutable file */
151#define S_DEAD 16 /* removed, but still open directory */
152#define S_NOQUOTA 32 /* Inode is not counted to quota */
153#define S_DIRSYNC 64 /* Directory modifications are synchronous */
154#define S_NOCMTIME 128 /* Do not update file c/mtime */
155#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
156#define S_PRIVATE 512 /* Inode is fs-internal */
157
158/*
159 * Note that nosuid etc flags are inode-specific: setting some file-system
160 * flags just means all the inodes inherit those flags by default. It might be
161 * possible to override it selectively if you really wanted to with some
162 * ioctl() that is not currently implemented.
163 *
164 * Exception: MS_RDONLY is always applied to the entire file system.
165 *
166 * Unfortunately, it is possible to change a filesystems flags with it mounted
167 * with files in use. This means that all of the inodes will not have their
168 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
169 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
170 */
171#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
172
173#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
174#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
175 ((inode)->i_flags & S_SYNC))
176#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
177 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
178#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
Eric Dumazet37756ce2007-02-10 01:44:49 -0800179#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500180#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
183#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
184#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
186
187#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
188#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
189#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
190#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
191
192/* the read-only stuff doesn't really belong here, but any other place is
193 probably as bad and I don't want to create yet another include file. */
194
195#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
196#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
197#define BLKRRPART _IO(0x12,95) /* re-read partition table */
198#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
199#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
200#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
201#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
202#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
203#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
204#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
205#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
206#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
207#if 0
208#define BLKPG _IO(0x12,105)/* See blkpg.h */
209
210/* Some people are morons. Do not use sizeof! */
211
212#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
213#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
214/* This was here just to show that the number is taken -
215 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
216#endif
217/* A jump here: 108-111 have been used for various private purposes. */
218#define BLKBSZGET _IOR(0x12,112,size_t)
219#define BLKBSZSET _IOW(0x12,113,size_t)
220#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
Jens Axboe2056a782006-03-23 20:00:26 +0100221#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
222#define BLKTRACESTART _IO(0x12,116)
223#define BLKTRACESTOP _IO(0x12,117)
224#define BLKTRACETEARDOWN _IO(0x12,118)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
227#define FIBMAP _IO(0x00,1) /* bmap access */
228#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
229
David Howells36695672006-08-29 19:06:16 +0100230#define FS_IOC_GETFLAGS _IOR('f', 1, long)
231#define FS_IOC_SETFLAGS _IOW('f', 2, long)
232#define FS_IOC_GETVERSION _IOR('v', 1, long)
233#define FS_IOC_SETVERSION _IOW('v', 2, long)
234#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
235#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
236#define FS_IOC32_GETVERSION _IOR('v', 1, int)
237#define FS_IOC32_SETVERSION _IOW('v', 2, int)
238
239/*
240 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
241 */
242#define FS_SECRM_FL 0x00000001 /* Secure deletion */
243#define FS_UNRM_FL 0x00000002 /* Undelete */
244#define FS_COMPR_FL 0x00000004 /* Compress file */
245#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
246#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
247#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
248#define FS_NODUMP_FL 0x00000040 /* do not dump file */
249#define FS_NOATIME_FL 0x00000080 /* do not update atime */
250/* Reserved for compression usage... */
251#define FS_DIRTY_FL 0x00000100
252#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
253#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
254#define FS_ECOMPR_FL 0x00000800 /* Compression error */
255/* End compression flags --- maybe not all used */
256#define FS_BTREE_FL 0x00001000 /* btree format dir */
257#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
258#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
259#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
260#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
261#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
262#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400263#define FS_EXTENT_FL 0x00080000 /* Extents */
264#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
David Howells36695672006-08-29 19:06:16 +0100265#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
266
267#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
268#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
269
270
Andrew Mortone46e4902006-05-22 22:35:24 -0700271#define SYNC_FILE_RANGE_WAIT_BEFORE 1
272#define SYNC_FILE_RANGE_WRITE 2
273#define SYNC_FILE_RANGE_WAIT_AFTER 4
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275#ifdef __KERNEL__
276
277#include <linux/linkage.h>
278#include <linux/wait.h>
279#include <linux/types.h>
280#include <linux/kdev_t.h>
281#include <linux/dcache.h>
Al Viro3f8206d2008-07-26 03:46:43 -0400282#include <linux/path.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283#include <linux/stat.h>
284#include <linux/cache.h>
285#include <linux/kobject.h>
286#include <linux/list.h>
287#include <linux/radix-tree.h>
288#include <linux/prio_tree.h>
289#include <linux/init.h>
Al Viro914e2632006-10-18 13:55:46 -0400290#include <linux/pid.h>
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800291#include <linux/mutex.h>
Satyam Sharma3bd858a2007-07-17 15:00:08 +0530292#include <linux/capability.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -0400293#include <linux/semaphore.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295#include <asm/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296#include <asm/byteorder.h>
297
Christoph Hellwiga5694252007-07-17 04:04:28 -0700298struct export_operations;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800299struct hd_geometry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300struct iovec;
301struct nameidata;
Christoph Hellwig92198f72005-06-23 22:00:59 -0700302struct kiocb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303struct pipe_inode_info;
304struct poll_table_struct;
305struct kstatfs;
306struct vm_area_struct;
307struct vfsmount;
308
Denis Cheng74bf17c2007-10-16 23:26:30 -0700309extern void __init inode_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310extern void __init inode_init_early(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311extern void __init files_init(unsigned long);
312
313struct buffer_head;
314typedef int (get_block_t)(struct inode *inode, sector_t iblock,
315 struct buffer_head *bh_result, int create);
Christoph Hellwig92198f72005-06-23 22:00:59 -0700316typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 ssize_t bytes, void *private);
318
319/*
320 * Attribute flags. These should be or-ed together to figure out what
321 * has been changed!
322 */
Miklos Szeredi9767d742008-07-01 15:01:26 +0200323#define ATTR_MODE (1 << 0)
324#define ATTR_UID (1 << 1)
325#define ATTR_GID (1 << 2)
326#define ATTR_SIZE (1 << 3)
327#define ATTR_ATIME (1 << 4)
328#define ATTR_MTIME (1 << 5)
329#define ATTR_CTIME (1 << 6)
330#define ATTR_ATIME_SET (1 << 7)
331#define ATTR_MTIME_SET (1 << 8)
332#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
333#define ATTR_ATTR_FLAG (1 << 10)
334#define ATTR_KILL_SUID (1 << 11)
335#define ATTR_KILL_SGID (1 << 12)
336#define ATTR_FILE (1 << 13)
337#define ATTR_KILL_PRIV (1 << 14)
338#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
339#define ATTR_TIMES_SET (1 << 16)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341/*
342 * This is the Inode Attributes structure, used for notify_change(). It
343 * uses the above definitions as flags, to know which values have changed.
344 * Also, in this manner, a Filesystem can look at only the values it cares
345 * about. Basically, these are the attributes that the VFS layer can
346 * request to change from the FS layer.
347 *
348 * Derek Atkins <warlord@MIT.EDU> 94-10-20
349 */
350struct iattr {
351 unsigned int ia_valid;
352 umode_t ia_mode;
353 uid_t ia_uid;
354 gid_t ia_gid;
355 loff_t ia_size;
356 struct timespec ia_atime;
357 struct timespec ia_mtime;
358 struct timespec ia_ctime;
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800359
360 /*
361 * Not an attribute, but an auxilary info for filesystems wanting to
362 * implement an ftruncate() like method. NOTE: filesystem should
363 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
364 */
365 struct file *ia_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366};
367
368/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 * Includes for diskquotas.
370 */
371#include <linux/quota.h>
372
Zach Brown994fc28c2005-12-15 14:28:17 -0800373/**
374 * enum positive_aop_returns - aop return codes with specific semantics
375 *
376 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
377 * completed, that the page is still locked, and
378 * should be considered active. The VM uses this hint
379 * to return the page to the active list -- it won't
380 * be a candidate for writeback again in the near
381 * future. Other callers must be careful to unlock
382 * the page if they get this return. Returned by
383 * writepage();
384 *
385 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
386 * unlocked it and the page might have been truncated.
387 * The caller should back up to acquiring a new page and
388 * trying again. The aop will be taking reasonable
389 * precautions not to livelock. If the caller held a page
390 * reference, it should drop it before retrying. Returned
Nick Piggin55144762007-10-16 01:25:26 -0700391 * by readpage().
Zach Brown994fc28c2005-12-15 14:28:17 -0800392 *
393 * address_space_operation functions return these large constants to indicate
394 * special semantics to the caller. These are much larger than the bytes in a
395 * page to allow for functions that return the number of bytes operated on in a
396 * given page.
397 */
398
399enum positive_aop_returns {
400 AOP_WRITEPAGE_ACTIVATE = 0x80000,
401 AOP_TRUNCATED_PAGE = 0x80001,
402};
403
Nick Pigginafddba42007-10-16 01:25:01 -0700404#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
Nick Piggin89e10782007-10-16 01:25:07 -0700405#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
Nick Pigginafddba42007-10-16 01:25:01 -0700406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407/*
408 * oh the beauties of C type declarations.
409 */
410struct page;
411struct address_space;
412struct writeback_control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Nick Piggin2f718ff2007-10-16 01:24:59 -0700414struct iov_iter {
415 const struct iovec *iov;
416 unsigned long nr_segs;
417 size_t iov_offset;
418 size_t count;
419};
420
421size_t iov_iter_copy_from_user_atomic(struct page *page,
422 struct iov_iter *i, unsigned long offset, size_t bytes);
423size_t iov_iter_copy_from_user(struct page *page,
424 struct iov_iter *i, unsigned long offset, size_t bytes);
425void iov_iter_advance(struct iov_iter *i, size_t bytes);
Nick Pigginafddba42007-10-16 01:25:01 -0700426int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700427size_t iov_iter_single_seg_count(struct iov_iter *i);
428
429static inline void iov_iter_init(struct iov_iter *i,
430 const struct iovec *iov, unsigned long nr_segs,
431 size_t count, size_t written)
432{
433 i->iov = iov;
434 i->nr_segs = nr_segs;
435 i->iov_offset = 0;
436 i->count = count + written;
437
438 iov_iter_advance(i, written);
439}
440
441static inline size_t iov_iter_count(struct iov_iter *i)
442{
443 return i->count;
444}
445
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700446/*
447 * "descriptor" for what we're up to with a read.
448 * This allows us to use the same read code yet
449 * have multiple different users of the data that
450 * we read from a file.
451 *
452 * The simplest case just copies the data to user
453 * mode.
454 */
455typedef struct {
456 size_t written;
457 size_t count;
458 union {
459 char __user *buf;
460 void *data;
461 } arg;
462 int error;
463} read_descriptor_t;
464
465typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
466 unsigned long, unsigned long);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468struct address_space_operations {
469 int (*writepage)(struct page *page, struct writeback_control *wbc);
470 int (*readpage)(struct file *, struct page *);
NeilBrown3978d7172006-03-26 01:37:17 -0800471 void (*sync_page)(struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 /* Write back some dirty pages from this mapping. */
474 int (*writepages)(struct address_space *, struct writeback_control *);
475
Andrew Morton4741c9f2006-03-24 03:18:11 -0800476 /* Set a page dirty. Return true if this dirtied it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 int (*set_page_dirty)(struct page *page);
478
479 int (*readpages)(struct file *filp, struct address_space *mapping,
480 struct list_head *pages, unsigned nr_pages);
481
482 /*
483 * ext3 requires that a successful prepare_write() call be followed
484 * by a commit_write() call - they must be balanced
485 */
486 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
487 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
Nick Pigginafddba42007-10-16 01:25:01 -0700488
489 int (*write_begin)(struct file *, struct address_space *mapping,
490 loff_t pos, unsigned len, unsigned flags,
491 struct page **pagep, void **fsdata);
492 int (*write_end)(struct file *, struct address_space *mapping,
493 loff_t pos, unsigned len, unsigned copied,
494 struct page *page, void *fsdata);
495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
497 sector_t (*bmap)(struct address_space *, sector_t);
NeilBrown2ff28e22006-03-26 01:37:18 -0800498 void (*invalidatepage) (struct page *, unsigned long);
Al Viro27496a82005-10-21 03:20:48 -0400499 int (*releasepage) (struct page *, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
501 loff_t offset, unsigned long nr_segs);
Nick Piggin70688e42008-04-28 02:13:02 -0700502 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
503 void **, unsigned long *);
Christoph Lametere965f962006-02-01 03:05:41 -0800504 /* migrate the contents of a page to the specified target */
Christoph Lameter2d1db3b2006-06-23 02:03:33 -0700505 int (*migratepage) (struct address_space *,
506 struct page *, struct page *);
Trond Myklebuste3db7692007-01-10 23:15:39 -0800507 int (*launder_page) (struct page *);
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700508 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
509 unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510};
511
Nick Pigginafddba42007-10-16 01:25:01 -0700512/*
513 * pagecache_write_begin/pagecache_write_end must be used by general code
514 * to write into the pagecache.
515 */
516int pagecache_write_begin(struct file *, struct address_space *mapping,
517 loff_t pos, unsigned len, unsigned flags,
518 struct page **pagep, void **fsdata);
519
520int pagecache_write_end(struct file *, struct address_space *mapping,
521 loff_t pos, unsigned len, unsigned copied,
522 struct page *page, void *fsdata);
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524struct backing_dev_info;
525struct address_space {
526 struct inode *host; /* owner: inode, block_device */
527 struct radix_tree_root page_tree; /* radix tree of all pages */
Nick Piggin19fd6232008-07-25 19:45:32 -0700528 spinlock_t tree_lock; /* and lock protecting it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
530 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
531 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
532 spinlock_t i_mmap_lock; /* protect tree, count, list */
533 unsigned int truncate_count; /* Cover race condition with truncate */
534 unsigned long nrpages; /* number of total pages */
535 pgoff_t writeback_index;/* writeback starts here */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700536 const struct address_space_operations *a_ops; /* methods */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 unsigned long flags; /* error bits/gfp mask */
538 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
539 spinlock_t private_lock; /* for use by the address_space */
540 struct list_head private_list; /* ditto */
541 struct address_space *assoc_mapping; /* ditto */
542} __attribute__((aligned(sizeof(long))));
543 /*
544 * On most architectures that alignment is already the case; but
545 * must be enforced here for CRIS, to let the least signficant bit
546 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
547 */
548
549struct block_device {
550 dev_t bd_dev; /* not a kdev_t - it's a search key */
551 struct inode * bd_inode; /* will die */
552 int bd_openers;
Arjan van de Venc039e312006-03-23 03:00:28 -0800553 struct mutex bd_mutex; /* open/close mutex */
David Chinnerf73ca1b2007-01-10 23:15:41 -0800554 struct semaphore bd_mount_sem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 struct list_head bd_inodes;
556 void * bd_holder;
557 int bd_holders;
Jun'ichi Nomura641dc632006-03-27 01:17:57 -0800558#ifdef CONFIG_SYSFS
559 struct list_head bd_holder_list;
560#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 struct block_device * bd_contains;
562 unsigned bd_block_size;
563 struct hd_struct * bd_part;
564 /* number of times partitions within this device have been opened. */
565 unsigned bd_part_count;
566 int bd_invalidated;
567 struct gendisk * bd_disk;
568 struct list_head bd_list;
569 struct backing_dev_info *bd_inode_backing_dev_info;
570 /*
571 * Private data. You must have bd_claim'ed the block_device
572 * to use this. NOTE: bd_claim allows an owner to claim
573 * the same device multiple times, the owner must take special
574 * care to not mess up bd_private for that case.
575 */
576 unsigned long bd_private;
577};
578
579/*
580 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
581 * radix trees
582 */
583#define PAGECACHE_TAG_DIRTY 0
584#define PAGECACHE_TAG_WRITEBACK 1
585
586int mapping_tagged(struct address_space *mapping, int tag);
587
588/*
589 * Might pages of this file be mapped into userspace?
590 */
591static inline int mapping_mapped(struct address_space *mapping)
592{
593 return !prio_tree_empty(&mapping->i_mmap) ||
594 !list_empty(&mapping->i_mmap_nonlinear);
595}
596
597/*
598 * Might pages of this file have been modified in userspace?
599 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
600 * marks vma as VM_SHARED if it is shared, and the file was opened for
601 * writing i.e. vma may be mprotected writable even if now readonly.
602 */
603static inline int mapping_writably_mapped(struct address_space *mapping)
604{
605 return mapping->i_mmap_writable != 0;
606}
607
608/*
609 * Use sequence counter to get consistent i_size on 32-bit processors.
610 */
611#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
612#include <linux/seqlock.h>
613#define __NEED_I_SIZE_ORDERED
614#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
615#else
616#define i_size_ordered_init(inode) do { } while (0)
617#endif
618
619struct inode {
620 struct hlist_node i_hash;
621 struct list_head i_list;
622 struct list_head i_sb_list;
623 struct list_head i_dentry;
624 unsigned long i_ino;
625 atomic_t i_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 unsigned int i_nlink;
627 uid_t i_uid;
628 gid_t i_gid;
629 dev_t i_rdev;
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500630 u64 i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 loff_t i_size;
Eric Dumazet83b7b442006-12-06 20:38:53 -0800632#ifdef __NEED_I_SIZE_ORDERED
633 seqcount_t i_size_seqcount;
634#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 struct timespec i_atime;
636 struct timespec i_mtime;
637 struct timespec i_ctime;
638 unsigned int i_blkbits;
Takashi Satoa0f62ac2006-03-26 01:37:52 -0800639 blkcnt_t i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 unsigned short i_bytes;
Arnaldo Carvalho de Melo12d40e42006-12-06 20:39:53 -0800641 umode_t i_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800643 struct mutex i_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 struct rw_semaphore i_alloc_sem;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800645 const struct inode_operations *i_op;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800646 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 struct super_block *i_sb;
648 struct file_lock *i_flock;
649 struct address_space *i_mapping;
650 struct address_space i_data;
651#ifdef CONFIG_QUOTA
652 struct dquot *i_dquot[MAXQUOTAS];
653#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 struct list_head i_devices;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700655 union {
656 struct pipe_inode_info *i_pipe;
Theodore Ts'oeaf796e2006-09-27 01:50:48 -0700657 struct block_device *i_bdev;
Theodore Ts'o577c4eb2006-09-27 01:50:49 -0700658 struct cdev *i_cdev;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700659 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 int i_cindex;
661
662 __u32 i_generation;
663
664#ifdef CONFIG_DNOTIFY
665 unsigned long i_dnotify_mask; /* Directory notify events */
666 struct dnotify_struct *i_dnotify; /* for directory notifications */
667#endif
668
Robert Love0eeca282005-07-12 17:06:03 -0400669#ifdef CONFIG_INOTIFY
670 struct list_head inotify_watches; /* watches on this inode */
Ingo Molnard4f9af92006-03-23 03:00:30 -0800671 struct mutex inotify_mutex; /* protects the watches list */
Robert Love0eeca282005-07-12 17:06:03 -0400672#endif
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 unsigned long i_state;
675 unsigned long dirtied_when; /* jiffies of first dirtying */
676
677 unsigned int i_flags;
678
679 atomic_t i_writecount;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700680#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 void *i_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700682#endif
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700683 void *i_private; /* fs or device private pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684};
685
686/*
Ingo Molnarf2eace22006-07-03 00:25:05 -0700687 * inode->i_mutex nesting subclasses for the lock validator:
688 *
689 * 0: the object of the current VFS operation
690 * 1: parent
691 * 2: child/target
692 * 3: quota file
693 *
694 * The locking order between these classes is
Ingo Molnar4df46242006-08-27 01:23:56 -0700695 * parent -> child -> normal -> xattr -> quota
Ingo Molnarf2eace22006-07-03 00:25:05 -0700696 */
697enum inode_i_mutex_lock_class
698{
699 I_MUTEX_NORMAL,
700 I_MUTEX_PARENT,
701 I_MUTEX_CHILD,
Ingo Molnar4df46242006-08-27 01:23:56 -0700702 I_MUTEX_XATTR,
Ingo Molnarf2eace22006-07-03 00:25:05 -0700703 I_MUTEX_QUOTA
704};
705
Mark Fasheh62752ee2006-10-17 10:31:38 +0200706extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
707extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
708
Ingo Molnarf2eace22006-07-03 00:25:05 -0700709/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 * NOTE: in a 32bit arch with a preemptable kernel and
711 * an UP compile the i_size_read/write must be atomic
712 * with respect to the local cpu (unlike with preempt disabled),
713 * but they don't need to be atomic with respect to other cpus like in
714 * true SMP (so they need either to either locally disable irq around
715 * the read or for example on x86 they can be still implemented as a
716 * cmpxchg8b without the need of the lock prefix). For SMP compiles
717 * and 64bit archs it makes no difference if preempt is enabled or not.
718 */
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800719static inline loff_t i_size_read(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
721#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
722 loff_t i_size;
723 unsigned int seq;
724
725 do {
726 seq = read_seqcount_begin(&inode->i_size_seqcount);
727 i_size = inode->i_size;
728 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
729 return i_size;
730#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
731 loff_t i_size;
732
733 preempt_disable();
734 i_size = inode->i_size;
735 preempt_enable();
736 return i_size;
737#else
738 return inode->i_size;
739#endif
740}
741
Miklos Szeredi7762f5a2006-10-17 00:10:07 -0700742/*
743 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
744 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
745 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
746 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747static inline void i_size_write(struct inode *inode, loff_t i_size)
748{
749#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
750 write_seqcount_begin(&inode->i_size_seqcount);
751 inode->i_size = i_size;
752 write_seqcount_end(&inode->i_size_seqcount);
753#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
754 preempt_disable();
755 inode->i_size = i_size;
756 preempt_enable();
757#else
758 inode->i_size = i_size;
759#endif
760}
761
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800762static inline unsigned iminor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
764 return MINOR(inode->i_rdev);
765}
766
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800767static inline unsigned imajor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
769 return MAJOR(inode->i_rdev);
770}
771
772extern struct block_device *I_BDEV(struct inode *inode);
773
774struct fown_struct {
775 rwlock_t lock; /* protects pid, uid, euid fields */
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700776 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
777 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 uid_t uid, euid; /* uid/euid of process setting the owner */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 int signum; /* posix.1b rt signal to be delivered on IO */
780};
781
782/*
783 * Track a single file's readahead state
784 */
785struct file_ra_state {
Fengguang Wu937085a2007-10-16 01:24:31 -0700786 pgoff_t start; /* where readahead started */
787 unsigned int size; /* # of readahead pages */
788 unsigned int async_size; /* do asynchronous readahead when
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700789 there are only # of pages ahead */
Fengguang Wu5ce11102007-07-19 01:47:59 -0700790
Fengguang Wu937085a2007-10-16 01:24:31 -0700791 unsigned int ra_pages; /* Maximum readahead window */
Fengguang Wu0bb7ba62007-10-16 01:24:32 -0700792 int mmap_miss; /* Cache miss stat for mmap accesses */
Fengguang Wuf4e6b492007-10-16 01:24:33 -0700793 loff_t prev_pos; /* Cache last read() position */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
Fengguang Wu5ce11102007-07-19 01:47:59 -0700796/*
Fengguang Wu5ce11102007-07-19 01:47:59 -0700797 * Check if @index falls in the readahead windows.
798 */
799static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
800{
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700801 return (index >= ra->start &&
802 index < ra->start + ra->size);
Fengguang Wu5ce11102007-07-19 01:47:59 -0700803}
804
Dave Hansenad775f52008-02-15 14:38:01 -0800805#define FILE_MNT_WRITE_TAKEN 1
806#define FILE_MNT_WRITE_RELEASED 2
807
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808struct file {
Eric Dumazet2f512012005-10-30 15:02:16 -0800809 /*
810 * fu_list becomes invalid after file_free is called and queued via
811 * fu_rcuhead for RCU freeing
812 */
813 union {
814 struct list_head fu_list;
815 struct rcu_head fu_rcuhead;
816 } f_u;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800817 struct path f_path;
818#define f_dentry f_path.dentry
819#define f_vfsmnt f_path.mnt
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800820 const struct file_operations *f_op;
Al Viro516e0cc2008-07-26 00:39:17 -0400821 atomic_long_t f_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 unsigned int f_flags;
823 mode_t f_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 loff_t f_pos;
825 struct fown_struct f_owner;
826 unsigned int f_uid, f_gid;
827 struct file_ra_state f_ra;
828
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -0700829 u64 f_version;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700830#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 void *f_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700832#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 /* needed for tty driver, and maybe others */
834 void *private_data;
835
836#ifdef CONFIG_EPOLL
837 /* Used by fs/eventpoll.c to link all the hooks to this file */
838 struct list_head f_ep_links;
839 spinlock_t f_ep_lock;
840#endif /* #ifdef CONFIG_EPOLL */
841 struct address_space *f_mapping;
Dave Hansenad775f52008-02-15 14:38:01 -0800842#ifdef CONFIG_DEBUG_WRITECOUNT
843 unsigned long f_mnt_write_state;
844#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845};
846extern spinlock_t files_lock;
847#define file_list_lock() spin_lock(&files_lock);
848#define file_list_unlock() spin_unlock(&files_lock);
849
Al Viro516e0cc2008-07-26 00:39:17 -0400850#define get_file(x) atomic_long_inc(&(x)->f_count)
851#define file_count(x) atomic_long_read(&(x)->f_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Dave Hansenad775f52008-02-15 14:38:01 -0800853#ifdef CONFIG_DEBUG_WRITECOUNT
854static inline void file_take_write(struct file *f)
855{
856 WARN_ON(f->f_mnt_write_state != 0);
857 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
858}
859static inline void file_release_write(struct file *f)
860{
861 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
862}
863static inline void file_reset_write(struct file *f)
864{
865 f->f_mnt_write_state = 0;
866}
867static inline void file_check_state(struct file *f)
868{
869 /*
870 * At this point, either both or neither of these bits
871 * should be set.
872 */
873 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
874 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
875}
876static inline int file_check_writeable(struct file *f)
877{
878 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
879 return 0;
880 printk(KERN_WARNING "writeable file with no "
881 "mnt_want_write()\n");
882 WARN_ON(1);
883 return -EINVAL;
884}
885#else /* !CONFIG_DEBUG_WRITECOUNT */
886static inline void file_take_write(struct file *filp) {}
887static inline void file_release_write(struct file *filp) {}
888static inline void file_reset_write(struct file *filp) {}
889static inline void file_check_state(struct file *filp) {}
890static inline int file_check_writeable(struct file *filp)
891{
892 return 0;
893}
894#endif /* CONFIG_DEBUG_WRITECOUNT */
895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896#define MAX_NON_LFS ((1UL<<31) - 1)
897
898/* Page cache limit. The filesystems should put that into their s_maxbytes
899 limits, otherwise bad things can happen in VM. */
900#if BITS_PER_LONG==32
901#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
902#elif BITS_PER_LONG==64
903#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
904#endif
905
906#define FL_POSIX 1
907#define FL_FLOCK 2
908#define FL_ACCESS 8 /* not trying to lock, just looking */
Trond Myklebustf475ae92006-06-29 16:38:32 -0400909#define FL_EXISTS 16 /* when unlocking, test for existence */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910#define FL_LEASE 32 /* lease held on this file */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700911#define FL_CLOSE 64 /* unlock on close */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912#define FL_SLEEP 128 /* A blocking lock */
913
914/*
Miklos Szeredibde74e42008-07-25 01:48:57 -0700915 * Special return value from posix_lock_file() and vfs_lock_file() for
916 * asynchronous locking.
917 */
918#define FILE_LOCK_DEFERRED 1
919
920/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 * The POSIX file lock owner is determined by
922 * the "struct files_struct" in the thread group
923 * (or NULL for no owner - BSD locks).
924 *
925 * Lockd stuffs a "host" pointer into this.
926 */
927typedef struct files_struct *fl_owner_t;
928
929struct file_lock_operations {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
931 void (*fl_release_private)(struct file_lock *);
932};
933
934struct lock_manager_operations {
935 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
936 void (*fl_notify)(struct file_lock *); /* unblock callback */
Marc Eshel2beb6612006-12-05 23:31:28 -0500937 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
939 void (*fl_release_private)(struct file_lock *);
940 void (*fl_break)(struct file_lock *);
941 int (*fl_mylease)(struct file_lock *, struct file_lock *);
942 int (*fl_change)(struct file_lock **, int);
943};
944
945/* that will die - we need it for nfs_lock_info */
946#include <linux/nfs_fs_i.h>
947
948struct file_lock {
949 struct file_lock *fl_next; /* singly linked list for this inode */
950 struct list_head fl_link; /* doubly linked list of all locks */
951 struct list_head fl_block; /* circular list of blocked processes */
952 fl_owner_t fl_owner;
Richard Kennedyafc12462008-07-11 17:20:49 -0700953 unsigned char fl_flags;
954 unsigned char fl_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 unsigned int fl_pid;
Vitaliy Gusevab1f1612008-01-17 00:07:08 +0000956 struct pid *fl_nspid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 wait_queue_head_t fl_wait;
958 struct file *fl_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 loff_t fl_start;
960 loff_t fl_end;
961
962 struct fasync_struct * fl_fasync; /* for lease break notifications */
963 unsigned long fl_break_time; /* for nonblocking lease breaks */
964
965 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
966 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
967 union {
968 struct nfs_lock_info nfs_fl;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000969 struct nfs4_lock_info nfs4_fl;
David Howellse8d6c552007-07-15 23:40:12 -0700970 struct {
971 struct list_head link; /* link in AFS vnode's pending_locks list */
972 int state; /* state of grant or error if -ve */
973 } afs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 } fl_u;
975};
976
977/* The following constant reflects the upper bound of the file/locking space */
978#ifndef OFFSET_MAX
979#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
980#define OFFSET_MAX INT_LIMIT(loff_t)
981#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
982#endif
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984#include <linux/fcntl.h>
985
986extern int fcntl_getlk(struct file *, struct flock __user *);
Peter Staubachc2936212005-07-27 11:45:09 -0700987extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
988 struct flock __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990#if BITS_PER_LONG == 32
991extern int fcntl_getlk64(struct file *, struct flock64 __user *);
Peter Staubachc2936212005-07-27 11:45:09 -0700992extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
993 struct flock64 __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994#endif
995
996extern void send_sigio(struct fown_struct *fown, int fd, int band);
997extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
998extern int fcntl_getlease(struct file *filp);
999
Andrew Mortonf79e2ab2006-03-31 02:30:42 -08001000/* fs/sync.c */
Mark Fasheh5b04aa32007-03-01 11:01:55 -08001001extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
1002 loff_t endbyte, unsigned int flags);
Andrew Mortonf79e2ab2006-03-31 02:30:42 -08001003
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004/* fs/locks.c */
1005extern void locks_init_lock(struct file_lock *);
1006extern void locks_copy_lock(struct file_lock *, struct file_lock *);
J. Bruce Fields1a747ee2008-04-24 10:08:22 -04001007extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008extern void locks_remove_posix(struct file *, fl_owner_t);
1009extern void locks_remove_flock(struct file *);
J. Bruce Fields6d34ac12007-05-11 16:09:32 -04001010extern void posix_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001011extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012extern int posix_lock_file_wait(struct file *, struct file_lock *);
J. Bruce Fields64a318e2006-01-03 09:55:46 +01001013extern int posix_unblock_lock(struct file *, struct file_lock *);
J. Bruce Fields3ee17ab2007-02-21 00:58:50 -05001014extern int vfs_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001015extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
Marc Eshel9b9d2ab2007-01-18 17:52:58 -05001016extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1018extern int __break_lease(struct inode *inode, unsigned int flags);
1019extern void lease_get_mtime(struct inode *, struct timespec *time);
Christoph Hellwig0af1a452007-07-31 00:39:22 -07001020extern int generic_setlease(struct file *, long, struct file_lock **);
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -04001021extern int vfs_setlease(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022extern int lease_modify(struct file_lock **, int);
1023extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1024extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
Pavel Emelyanov7f8ada92007-10-01 14:41:15 -07001025extern struct seq_operations locks_seq_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027struct fasync_struct {
1028 int magic;
1029 int fa_fd;
1030 struct fasync_struct *fa_next; /* singly linked list */
1031 struct file *fa_file;
1032};
1033
1034#define FASYNC_MAGIC 0x4601
1035
1036/* SMP safe fasync helpers: */
1037extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1038/* can be called from interrupts */
1039extern void kill_fasync(struct fasync_struct **, int, int);
1040/* only for net: no internal synchronization */
1041extern void __kill_fasync(struct fasync_struct *, int, int);
1042
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001043extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044extern int f_setown(struct file *filp, unsigned long arg, int force);
1045extern void f_delown(struct file *filp);
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001046extern pid_t f_getown(struct file *filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047extern int send_sigurg(struct fown_struct *fown);
1048
1049/*
1050 * Umount options
1051 */
1052
1053#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1054#define MNT_DETACH 0x00000002 /* Just detach from the tree */
1055#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1056
1057extern struct list_head super_blocks;
1058extern spinlock_t sb_lock;
1059
Kentaro Makitada3bbdd2008-07-23 21:27:13 -07001060#define sb_entry(list) list_entry((list), struct super_block, s_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061#define S_BIAS (1<<30)
1062struct super_block {
1063 struct list_head s_list; /* Keep this first */
1064 dev_t s_dev; /* search index; _not_ kdev_t */
1065 unsigned long s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 unsigned char s_blocksize_bits;
1067 unsigned char s_dirt;
1068 unsigned long long s_maxbytes; /* Max file size */
1069 struct file_system_type *s_type;
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001070 const struct super_operations *s_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 struct dquot_operations *dq_op;
1072 struct quotactl_ops *s_qcop;
Christoph Hellwig39655162007-10-21 16:42:17 -07001073 const struct export_operations *s_export_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 unsigned long s_flags;
1075 unsigned long s_magic;
1076 struct dentry *s_root;
1077 struct rw_semaphore s_umount;
Ingo Molnar7892f2f2006-01-09 15:59:25 -08001078 struct mutex s_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 int s_count;
1080 int s_syncing;
1081 int s_need_sync_fs;
1082 atomic_t s_active;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001083#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 void *s_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001085#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 struct xattr_handler **s_xattr;
1087
1088 struct list_head s_inodes; /* all inodes */
1089 struct list_head s_dirty; /* dirty inodes */
1090 struct list_head s_io; /* parked for writeback */
Ken Chen0e0f4fc2007-10-16 23:30:38 -07001091 struct list_head s_more_io; /* parked for more writeback */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1093 struct list_head s_files;
Kentaro Makitada3bbdd2008-07-23 21:27:13 -07001094 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1095 struct list_head s_dentry_lru; /* unused dentry lru */
1096 int s_nr_dentry_unused; /* # of dentry on lru */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
1098 struct block_device *s_bdev;
David Howellsacaebfd2007-05-10 22:51:50 -07001099 struct mtd_info *s_mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 struct list_head s_instances;
1101 struct quota_info s_dquot; /* Diskquota specific options */
1102
1103 int s_frozen;
1104 wait_queue_head_t s_wait_unfrozen;
1105
1106 char s_id[32]; /* Informational name */
1107
1108 void *s_fs_info; /* Filesystem private info */
1109
1110 /*
1111 * The next field is for VFS *only*. No filesystems have any business
1112 * even looking at it. You had been warned.
1113 */
Arjan van de Vena11f3a02006-03-23 03:00:33 -08001114 struct mutex s_vfs_rename_mutex; /* Kludge */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Kalin KOZHUHAROV8ba8e952006-04-01 01:41:22 +02001116 /* Granularity of c/m/atime in ns.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 Cannot be worse than a second */
1118 u32 s_time_gran;
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001119
1120 /*
1121 * Filesystem subtype. If non-empty the filesystem type field
1122 * in /proc/mounts will be "type.subtype"
1123 */
1124 char *s_subtype;
Miklos Szeredib3b304a2008-02-08 04:21:35 -08001125
1126 /*
1127 * Saved mount options for lazy filesystems using
1128 * generic_show_options()
1129 */
1130 char *s_options;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131};
1132
1133extern struct timespec current_fs_time(struct super_block *sb);
1134
1135/*
1136 * Snapshotting support.
1137 */
1138enum {
1139 SB_UNFROZEN = 0,
1140 SB_FREEZE_WRITE = 1,
1141 SB_FREEZE_TRANS = 2,
1142};
1143
1144#define vfs_check_frozen(sb, level) \
1145 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1146
Al Viro914e2632006-10-18 13:55:46 -04001147#define get_fs_excl() atomic_inc(&current->fs_excl)
1148#define put_fs_excl() atomic_dec(&current->fs_excl)
1149#define has_fs_excl() atomic_read(&current->fs_excl)
Jens Axboe22e2c502005-06-27 10:55:12 +02001150
Satyam Sharma3bd858a2007-07-17 15:00:08 +05301151#define is_owner_or_cap(inode) \
1152 ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
1153
Al Viro914e2632006-10-18 13:55:46 -04001154/* not quite ready to be deprecated, but... */
1155extern void lock_super(struct super_block *);
1156extern void unlock_super(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158/*
1159 * VFS helper functions..
1160 */
Christoph Hellwige4543ed2005-11-08 21:35:04 -08001161extern int vfs_permission(struct nameidata *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1163extern int vfs_mkdir(struct inode *, struct dentry *, int);
1164extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
Miklos Szeredidb2e7472008-06-24 16:50:16 +02001165extern int vfs_symlink(struct inode *, struct dentry *, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1167extern int vfs_rmdir(struct inode *, struct dentry *);
1168extern int vfs_unlink(struct inode *, struct dentry *);
1169extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1170
1171/*
1172 * VFS dentry helper functions.
1173 */
1174extern void dentry_unhash(struct dentry *dentry);
1175
1176/*
Christoph Hellwig8c744fb2005-11-08 21:35:04 -08001177 * VFS file helper functions.
1178 */
1179extern int file_permission(struct file *, int);
1180
1181/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 * File types
1183 *
1184 * NOTE! These match bits 12..15 of stat.st_mode
1185 * (ie "(i_mode >> 12) & 15").
1186 */
1187#define DT_UNKNOWN 0
1188#define DT_FIFO 1
1189#define DT_CHR 2
1190#define DT_DIR 4
1191#define DT_BLK 6
1192#define DT_REG 8
1193#define DT_LNK 10
1194#define DT_SOCK 12
1195#define DT_WHT 14
1196
1197#define OSYNC_METADATA (1<<0)
1198#define OSYNC_DATA (1<<1)
1199#define OSYNC_INODE (1<<2)
1200int generic_osync_inode(struct inode *, struct address_space *, int);
1201
1202/*
1203 * This is the "filldir" function type, used by readdir() to let
1204 * the kernel specify what kind of dirent layout it wants to have.
1205 * This allows the kernel to read directories into kernel space or
1206 * to have different dirent layouts depending on the binary type.
1207 */
David Howellsafefdbb2006-10-03 01:13:46 -07001208typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209
1210struct block_device_operations {
1211 int (*open) (struct inode *, struct file *);
1212 int (*release) (struct inode *, struct file *);
1213 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -07001214 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
Jared Hulbert30afcb42008-04-28 02:13:02 -07001216 int (*direct_access) (struct block_device *, sector_t,
1217 void **, unsigned long *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 int (*media_changed) (struct gendisk *);
1219 int (*revalidate_disk) (struct gendisk *);
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001220 int (*getgeo)(struct block_device *, struct hd_geometry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 struct module *owner;
1222};
1223
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224/* These macros are for out of kernel modules to test that
1225 * the kernel supports the unlocked_ioctl and compat_ioctl
1226 * fields in struct file_operations. */
1227#define HAVE_COMPAT_IOCTL 1
1228#define HAVE_UNLOCKED_IOCTL 1
1229
1230/*
1231 * NOTE:
1232 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1233 * can be called without the big kernel lock held in all filesystems.
1234 */
1235struct file_operations {
1236 struct module *owner;
1237 loff_t (*llseek) (struct file *, loff_t, int);
1238 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001240 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1241 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 int (*readdir) (struct file *, void *, filldir_t);
1243 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1244 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1245 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1246 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1247 int (*mmap) (struct file *, struct vm_area_struct *);
1248 int (*open) (struct inode *, struct file *);
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001249 int (*flush) (struct file *, fl_owner_t id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 int (*release) (struct inode *, struct file *);
1251 int (*fsync) (struct file *, struct dentry *, int datasync);
1252 int (*aio_fsync) (struct kiocb *, int datasync);
1253 int (*fasync) (int, struct file *, int);
1254 int (*lock) (struct file *, int, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1256 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1257 int (*check_flags)(int);
1258 int (*dir_notify)(struct file *filp, unsigned long arg);
1259 int (*flock) (struct file *, int, struct file_lock *);
Jens Axboecbb7e572006-04-11 14:57:50 +02001260 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1261 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
J. Bruce Fieldsf9ffed22006-11-14 15:51:40 -05001262 int (*setlease)(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263};
1264
1265struct inode_operations {
1266 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1267 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1268 int (*link) (struct dentry *,struct inode *,struct dentry *);
1269 int (*unlink) (struct inode *,struct dentry *);
1270 int (*symlink) (struct inode *,struct dentry *,const char *);
1271 int (*mkdir) (struct inode *,struct dentry *,int);
1272 int (*rmdir) (struct inode *,struct dentry *);
1273 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1274 int (*rename) (struct inode *, struct dentry *,
1275 struct inode *, struct dentry *);
1276 int (*readlink) (struct dentry *, char __user *,int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001277 void * (*follow_link) (struct dentry *, struct nameidata *);
1278 void (*put_link) (struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 void (*truncate) (struct inode *);
Al Viroe6305c42008-07-15 21:03:57 -04001280 int (*permission) (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 int (*setattr) (struct dentry *, struct iattr *);
1282 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1283 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1284 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1285 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1286 int (*removexattr) (struct dentry *, const char *);
Badari Pulavartyf6b3ec22006-01-06 00:10:38 -08001287 void (*truncate_range)(struct inode *, loff_t, loff_t);
Amit Arora97ac7352007-07-17 21:42:44 -04001288 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1289 loff_t len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290};
1291
1292struct seq_file;
1293
Badari Pulavartyeed4e512006-09-30 23:28:49 -07001294ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1295 unsigned long nr_segs, unsigned long fast_segs,
1296 struct iovec *fast_pointer,
1297 struct iovec **ret_pointer);
1298
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1300extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1301extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1302 unsigned long, loff_t *);
1303extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1304 unsigned long, loff_t *);
1305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306struct super_operations {
1307 struct inode *(*alloc_inode)(struct super_block *sb);
1308 void (*destroy_inode)(struct inode *);
1309
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 void (*dirty_inode) (struct inode *);
1311 int (*write_inode) (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 void (*drop_inode) (struct inode *);
1313 void (*delete_inode) (struct inode *);
1314 void (*put_super) (struct super_block *);
1315 void (*write_super) (struct super_block *);
1316 int (*sync_fs)(struct super_block *sb, int wait);
1317 void (*write_super_lockfs) (struct super_block *);
1318 void (*unlockfs) (struct super_block *);
David Howells726c3342006-06-23 02:02:58 -07001319 int (*statfs) (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 int (*remount_fs) (struct super_block *, int *, char *);
1321 void (*clear_inode) (struct inode *);
Al Viro42faad92008-04-24 07:21:56 -04001322 void (*umount_begin) (struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
1324 int (*show_options)(struct seq_file *, struct vfsmount *);
Chuck Leverb4629fe2006-03-20 13:44:12 -05001325 int (*show_stats)(struct seq_file *, struct vfsmount *);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001326#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1328 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001329#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330};
1331
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001332/*
1333 * Inode state bits. Protected by inode_lock.
1334 *
1335 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1336 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1337 *
1338 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1339 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1340 * various stages of removing an inode.
1341 *
1342 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1343 *
Joern Engele7ca2d42008-02-06 01:36:59 -08001344 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1345 * fdatasync(). i_atime is the usual cause.
Jan Kara000cb482008-02-14 19:31:32 -08001346 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1347 * these changes separately from I_DIRTY_SYNC so that we
1348 * don't have to write inode on fdatasync() when only
1349 * mtime has changed in it.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001350 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1351 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1352 * are cleared by unlock_new_inode(), called from iget().
1353 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1354 * is zero. I_FREEING must be set when I_WILL_FREE is
1355 * cleared.
1356 * I_FREEING Set when inode is about to be freed but still has dirty
1357 * pages or buffers attached or the inode itself is still
1358 * dirty.
1359 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1360 * and can be destroyed.
1361 *
1362 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1363 * prohibited for many purposes. iget() must wait for
1364 * the inode to be completely released, then create it
1365 * anew. Other functions will just ignore such inodes,
1366 * if appropriate. I_LOCK is used for waiting.
1367 *
1368 * I_LOCK Serves as both a mutex and completion notification.
1369 * New inodes set I_LOCK. If two processes both create
1370 * the same inode, one of them will release its inode and
1371 * wait for I_LOCK to be released before returning.
1372 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1373 * also cause waiting on I_LOCK, without I_LOCK actually
1374 * being set. find_inode() uses this to prevent returning
1375 * nearly-dead inodes.
1376 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
Joe Perchesfd3f8982008-02-03 17:45:46 +02001377 * of inode dirty data. Having a separate lock for this
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001378 * purpose reduces latency and prevents some filesystem-
1379 * specific deadlocks.
1380 *
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001381 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1382 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1383 * I_CLEAR? If not, why?
1384 */
1385#define I_DIRTY_SYNC 1
1386#define I_DIRTY_DATASYNC 2
1387#define I_DIRTY_PAGES 4
1388#define I_NEW 8
1389#define I_WILL_FREE 16
1390#define I_FREEING 32
1391#define I_CLEAR 64
1392#define __I_LOCK 7
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393#define I_LOCK (1 << __I_LOCK)
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001394#define __I_SYNC 8
1395#define I_SYNC (1 << __I_SYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
1397#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1398
1399extern void __mark_inode_dirty(struct inode *, int);
1400static inline void mark_inode_dirty(struct inode *inode)
1401{
1402 __mark_inode_dirty(inode, I_DIRTY);
1403}
1404
1405static inline void mark_inode_dirty_sync(struct inode *inode)
1406{
1407 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1408}
1409
Dave Hansen71c42152007-06-23 17:16:42 -07001410/**
1411 * inc_nlink - directly increment an inode's link count
1412 * @inode: inode
1413 *
1414 * This is a low-level filesystem helper to replace any
1415 * direct filesystem manipulation of i_nlink. Currently,
1416 * it is only here for parity with dec_nlink().
1417 */
Dave Hansend8c76e62006-09-30 23:29:04 -07001418static inline void inc_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001419{
1420 inode->i_nlink++;
Dave Hansend8c76e62006-09-30 23:29:04 -07001421}
1422
1423static inline void inode_inc_link_count(struct inode *inode)
1424{
1425 inc_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001426 mark_inode_dirty(inode);
1427}
1428
Dave Hansen71c42152007-06-23 17:16:42 -07001429/**
1430 * drop_nlink - directly drop an inode's link count
1431 * @inode: inode
1432 *
1433 * This is a low-level filesystem helper to replace any
1434 * direct filesystem manipulation of i_nlink. In cases
1435 * where we are attempting to track writes to the
1436 * filesystem, a decrement to zero means an imminent
1437 * write when the file is truncated and actually unlinked
1438 * on the filesystem.
1439 */
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001440static inline void drop_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001441{
1442 inode->i_nlink--;
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001443}
1444
Dave Hansen71c42152007-06-23 17:16:42 -07001445/**
1446 * clear_nlink - directly zero an inode's link count
1447 * @inode: inode
1448 *
1449 * This is a low-level filesystem helper to replace any
1450 * direct filesystem manipulation of i_nlink. See
1451 * drop_nlink() for why we care about i_nlink hitting zero.
1452 */
Dave Hansence71ec32006-09-30 23:29:06 -07001453static inline void clear_nlink(struct inode *inode)
1454{
1455 inode->i_nlink = 0;
1456}
1457
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001458static inline void inode_dec_link_count(struct inode *inode)
1459{
1460 drop_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001461 mark_inode_dirty(inode);
1462}
1463
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001464/**
1465 * inode_inc_iversion - increments i_version
1466 * @inode: inode that need to be updated
1467 *
1468 * Every time the inode is modified, the i_version field will be incremented.
1469 * The filesystem has to be mounted with i_version flag
1470 */
1471
1472static inline void inode_inc_iversion(struct inode *inode)
1473{
1474 spin_lock(&inode->i_lock);
1475 inode->i_version++;
1476 spin_unlock(&inode->i_lock);
1477}
1478
Christoph Hellwig869243a2006-01-09 20:52:03 -08001479extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480static inline void file_accessed(struct file *file)
1481{
1482 if (!(file->f_flags & O_NOATIME))
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001483 touch_atime(file->f_path.mnt, file->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484}
1485
1486int sync_inode(struct inode *inode, struct writeback_control *wbc);
1487
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488struct file_system_type {
1489 const char *name;
1490 int fs_flags;
David Howells454e2392006-06-23 02:02:57 -07001491 int (*get_sb) (struct file_system_type *, int,
1492 const char *, void *, struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 void (*kill_sb) (struct super_block *);
1494 struct module *owner;
1495 struct file_system_type * next;
1496 struct list_head fs_supers;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001497
Ingo Molnarcf516242006-07-03 00:25:27 -07001498 struct lock_class_key s_lock_key;
Arjan van de Ven897c6ff2006-07-03 00:25:28 -07001499 struct lock_class_key s_umount_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001500
1501 struct lock_class_key i_lock_key;
1502 struct lock_class_key i_mutex_key;
Peter Zijlstra14358e62007-10-14 01:38:33 +02001503 struct lock_class_key i_mutex_dir_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001504 struct lock_class_key i_alloc_sem_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505};
1506
David Howells454e2392006-06-23 02:02:57 -07001507extern int get_sb_bdev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 int flags, const char *dev_name, void *data,
David Howells454e2392006-06-23 02:02:57 -07001509 int (*fill_super)(struct super_block *, void *, int),
1510 struct vfsmount *mnt);
1511extern int get_sb_single(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001513 int (*fill_super)(struct super_block *, void *, int),
1514 struct vfsmount *mnt);
1515extern int get_sb_nodev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001517 int (*fill_super)(struct super_block *, void *, int),
1518 struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519void generic_shutdown_super(struct super_block *sb);
1520void kill_block_super(struct super_block *sb);
1521void kill_anon_super(struct super_block *sb);
1522void kill_litter_super(struct super_block *sb);
1523void deactivate_super(struct super_block *sb);
1524int set_anon_super(struct super_block *s, void *data);
1525struct super_block *sget(struct file_system_type *type,
1526 int (*test)(struct super_block *,void *),
1527 int (*set)(struct super_block *,void *),
1528 void *data);
David Howells454e2392006-06-23 02:02:57 -07001529extern int get_sb_pseudo(struct file_system_type *, char *,
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001530 const struct super_operations *ops, unsigned long,
David Howells454e2392006-06-23 02:02:57 -07001531 struct vfsmount *mnt);
1532extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533int __put_super_and_need_restart(struct super_block *sb);
1534void unnamed_dev_init(void);
1535
1536/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1537#define fops_get(fops) \
1538 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1539#define fops_put(fops) \
1540 do { if (fops) module_put((fops)->owner); } while(0)
1541
1542extern int register_filesystem(struct file_system_type *);
1543extern int unregister_filesystem(struct file_system_type *);
Pavel Emelyanov8bf97252007-10-18 23:40:02 -07001544extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1545#define kern_mount(type) kern_mount_data(type, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546extern int may_umount_tree(struct vfsmount *);
1547extern int may_umount(struct vfsmount *);
1548extern long do_mount(char *, char *, char *, unsigned long, void *);
Al Viro8aec0802007-06-07 12:20:32 -04001549extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *);
1550extern void drop_collected_mounts(struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
David Howells726c3342006-06-23 02:02:58 -07001552extern int vfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001554/* /sys/fs */
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001555extern struct kobject *fs_kobj;
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001556
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557#define FLOCK_VERIFY_READ 1
1558#define FLOCK_VERIFY_WRITE 2
1559
1560extern int locks_mandatory_locked(struct inode *);
1561extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1562
1563/*
1564 * Candidates for mandatory locking have the setgid bit set
1565 * but no group execute bit - an otherwise meaningless combination.
1566 */
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001567
1568static inline int __mandatory_lock(struct inode *ino)
1569{
1570 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1571}
1572
1573/*
1574 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1575 * otherwise these will be advisory locks
1576 */
1577
1578static inline int mandatory_lock(struct inode *ino)
1579{
1580 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1581}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582
1583static inline int locks_verify_locked(struct inode *inode)
1584{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001585 if (mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 return locks_mandatory_locked(inode);
1587 return 0;
1588}
1589
1590extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1591
1592static inline int locks_verify_truncate(struct inode *inode,
1593 struct file *filp,
1594 loff_t size)
1595{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001596 if (inode->i_flock && mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 return locks_mandatory_area(
1598 FLOCK_VERIFY_WRITE, inode, filp,
1599 size < inode->i_size ? size : inode->i_size,
1600 (size < inode->i_size ? inode->i_size - size
1601 : size - inode->i_size)
1602 );
1603 return 0;
1604}
1605
1606static inline int break_lease(struct inode *inode, unsigned int mode)
1607{
1608 if (inode->i_flock)
1609 return __break_lease(inode, mode);
1610 return 0;
1611}
1612
1613/* fs/open.c */
1614
NeilBrown4a301312006-01-08 01:02:39 -08001615extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1616 struct file *filp);
Jason Uhlenkott8e8a1402007-10-20 03:16:18 +02001617extern long do_sys_open(int dfd, const char __user *filename, int flags,
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001618 int mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619extern struct file *filp_open(const char *, int, int);
1620extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1621extern int filp_close(struct file *, fl_owner_t id);
1622extern char * getname(const char __user *);
1623
1624/* fs/dcache.c */
1625extern void __init vfs_caches_init_early(void);
1626extern void __init vfs_caches_init(unsigned long);
1627
Christoph Lameterb86c0892006-12-06 20:32:57 -08001628extern struct kmem_cache *names_cachep;
1629
Christoph Lametere94b1762006-12-06 20:33:17 -08001630#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1632#ifndef CONFIG_AUDITSYSCALL
1633#define putname(name) __putname(name)
1634#else
1635extern void putname(const char *name);
1636#endif
1637
David Howells93614012006-09-30 20:45:40 +02001638#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639extern int register_blkdev(unsigned int, const char *);
Akinobu Mitaf4480242007-07-17 04:03:47 -07001640extern void unregister_blkdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641extern struct block_device *bdget(dev_t);
1642extern void bd_set_size(struct block_device *, loff_t size);
1643extern void bd_forget(struct inode *inode);
1644extern void bdput(struct block_device *);
1645extern struct block_device *open_by_devnum(dev_t, unsigned);
David Howells93614012006-09-30 20:45:40 +02001646#else
1647static inline void bd_forget(struct inode *inode) {}
1648#endif
1649extern const struct file_operations def_blk_fops;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001650extern const struct file_operations def_chr_fops;
1651extern const struct file_operations bad_sock_fops;
1652extern const struct file_operations def_fifo_fops;
David Howells93614012006-09-30 20:45:40 +02001653#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1655extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
Alasdair G Kergon7006f6e2006-10-03 01:15:21 -07001656extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
1657 struct gendisk *disk, unsigned cmd,
1658 unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1660extern int blkdev_get(struct block_device *, mode_t, unsigned);
1661extern int blkdev_put(struct block_device *);
1662extern int bd_claim(struct block_device *, void *);
1663extern void bd_release(struct block_device *);
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08001664#ifdef CONFIG_SYSFS
1665extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1666extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1667#else
1668#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1669#define bd_release_from_disk(bdev, disk) bd_release(bdev)
1670#endif
David Howells93614012006-09-30 20:45:40 +02001671#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672
1673/* fs/char_dev.c */
Joe Korty68eef3b2006-03-31 02:30:32 -08001674#define CHRDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1676extern int register_chrdev_region(dev_t, unsigned, const char *);
1677extern int register_chrdev(unsigned int, const char *,
Arjan van de Ven99ac48f2006-03-28 01:56:41 -08001678 const struct file_operations *);
Akinobu Mitae53252d2007-07-19 01:47:51 -07001679extern void unregister_chrdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680extern void unregister_chrdev_region(dev_t, unsigned);
Joe Korty68eef3b2006-03-31 02:30:32 -08001681extern void chrdev_show(struct seq_file *,off_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682
1683/* fs/block_dev.c */
1684#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
David Howells93614012006-09-30 20:45:40 +02001685
1686#ifdef CONFIG_BLOCK
1687#define BLKDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688extern const char *__bdevname(dev_t, char *buffer);
1689extern const char *bdevname(struct block_device *bdev, char *buffer);
1690extern struct block_device *lookup_bdev(const char *);
1691extern struct block_device *open_bdev_excl(const char *, int, void *);
1692extern void close_bdev_excl(struct block_device *);
Joe Korty68eef3b2006-03-31 02:30:32 -08001693extern void blkdev_show(struct seq_file *,off_t);
David Howells93614012006-09-30 20:45:40 +02001694#else
1695#define BLKDEV_MAJOR_HASH_SIZE 0
1696#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697
1698extern void init_special_inode(struct inode *, umode_t, dev_t);
1699
1700/* Invalid inode operations -- fs/bad_inode.c */
1701extern void make_bad_inode(struct inode *);
1702extern int is_bad_inode(struct inode *);
1703
Denys Vlasenkod2d96482008-07-01 14:16:09 +02001704extern const struct file_operations read_pipefifo_fops;
1705extern const struct file_operations write_pipefifo_fops;
1706extern const struct file_operations rdwr_pipefifo_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707
1708extern int fs_may_remount_ro(struct super_block *);
1709
David Howells93614012006-09-30 20:45:40 +02001710#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711/*
1712 * return READ, READA, or WRITE
1713 */
1714#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1715
1716/*
1717 * return data direction, READ or WRITE
1718 */
1719#define bio_data_dir(bio) ((bio)->bi_rw & 1)
1720
1721extern int check_disk_change(struct block_device *);
Christoph Hellwig2ef41632005-05-05 16:15:59 -07001722extern int __invalidate_device(struct block_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723extern int invalidate_partition(struct gendisk *, int);
David Howells93614012006-09-30 20:45:40 +02001724#endif
1725extern int invalidate_inodes(struct super_block *);
Andrew Mortonfc9a07e2007-07-15 23:38:14 -07001726unsigned long __invalidate_mapping_pages(struct address_space *mapping,
1727 pgoff_t start, pgoff_t end,
1728 bool be_atomic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729unsigned long invalidate_mapping_pages(struct address_space *mapping,
1730 pgoff_t start, pgoff_t end);
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08001731
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08001732static inline unsigned long __deprecated
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08001733invalidate_inode_pages(struct address_space *mapping)
1734{
1735 return invalidate_mapping_pages(mapping, 0, ~0UL);
1736}
1737
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738static inline void invalidate_remote_inode(struct inode *inode)
1739{
1740 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1741 S_ISLNK(inode->i_mode))
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08001742 invalidate_mapping_pages(inode->i_mapping, 0, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743}
1744extern int invalidate_inode_pages2(struct address_space *mapping);
1745extern int invalidate_inode_pages2_range(struct address_space *mapping,
1746 pgoff_t start, pgoff_t end);
Artem Bityutskiy4ee6afd2008-05-07 21:01:30 +03001747extern void generic_sync_sb_inodes(struct super_block *sb,
1748 struct writeback_control *wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749extern int write_inode_now(struct inode *, int);
1750extern int filemap_fdatawrite(struct address_space *);
1751extern int filemap_flush(struct address_space *);
1752extern int filemap_fdatawait(struct address_space *);
1753extern int filemap_write_and_wait(struct address_space *mapping);
1754extern int filemap_write_and_wait_range(struct address_space *mapping,
1755 loff_t lstart, loff_t lend);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08001756extern int wait_on_page_writeback_range(struct address_space *mapping,
1757 pgoff_t start, pgoff_t end);
1758extern int __filemap_fdatawrite_range(struct address_space *mapping,
1759 loff_t start, loff_t end, int sync_mode);
Jan Karaf4c0a0f2008-07-11 19:27:31 -04001760extern int filemap_fdatawrite_range(struct address_space *mapping,
1761 loff_t start, loff_t end);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08001762
Andrew Morton18e79b42006-03-24 03:18:14 -08001763extern long do_fsync(struct file *file, int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764extern void sync_supers(void);
1765extern void sync_filesystems(int wait);
David Howellscf9a2ae2006-08-29 19:05:54 +01001766extern void __fsync_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767extern void emergency_sync(void);
1768extern void emergency_remount(void);
1769extern int do_remount_sb(struct super_block *sb, int flags,
1770 void *data, int force);
David Howells93614012006-09-30 20:45:40 +02001771#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772extern sector_t bmap(struct inode *, sector_t);
David Howells93614012006-09-30 20:45:40 +02001773#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774extern int notify_change(struct dentry *, struct iattr *);
Al Virof419a2e2008-07-22 00:07:17 -04001775extern int inode_permission(struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776extern int generic_permission(struct inode *, int,
1777 int (*check_acl)(struct inode *, int));
1778
1779extern int get_write_access(struct inode *);
1780extern int deny_write_access(struct file *);
1781static inline void put_write_access(struct inode * inode)
1782{
1783 atomic_dec(&inode->i_writecount);
1784}
1785static inline void allow_write_access(struct file *file)
1786{
1787 if (file)
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001788 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789}
1790extern int do_pipe(int *);
Ulrich Dreppered8cae82008-07-23 21:29:30 -07001791extern int do_pipe_flags(int *, int);
Ulrich Drepperbe61a862008-07-23 21:29:40 -07001792extern struct file *create_read_pipe(struct file *f, int flags);
1793extern struct file *create_write_pipe(int flags);
Andi Kleend6cbd282006-09-30 23:29:26 -07001794extern void free_write_pipe(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795
Christoph Hellwiga70e65d2008-02-15 14:37:28 -08001796extern struct file *do_filp_open(int dfd, const char *pathname,
1797 int open_flag, int mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798extern int may_open(struct nameidata *, int, int);
1799
1800extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1801extern struct file * open_exec(const char *);
1802
1803/* fs/dcache.c -- generic fs support functions */
1804extern int is_subdir(struct dentry *, struct dentry *);
1805extern ino_t find_inode_number(struct dentry *, struct qstr *);
1806
1807#include <linux/err.h>
1808
1809/* needed for stackable file system support */
1810extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1811
1812extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1813
1814extern void inode_init_once(struct inode *);
1815extern void iput(struct inode *);
1816extern struct inode * igrab(struct inode *);
1817extern ino_t iunique(struct super_block *, ino_t);
1818extern int inode_needs_sync(struct inode *inode);
1819extern void generic_delete_inode(struct inode *inode);
Mark Fashehcb2c0232005-07-07 17:56:03 -07001820extern void generic_drop_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821
Anton Altaparmakov88bd5122005-07-13 01:10:44 -07001822extern struct inode *ilookup5_nowait(struct super_block *sb,
1823 unsigned long hashval, int (*test)(struct inode *, void *),
1824 void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1826 int (*test)(struct inode *, void *), void *data);
1827extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1828
1829extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1830extern struct inode * iget_locked(struct super_block *, unsigned long);
1831extern void unlock_new_inode(struct inode *);
1832
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833extern void __iget(struct inode * inode);
David Howellsb46980f2008-02-07 00:15:27 -08001834extern void iget_failed(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835extern void clear_inode(struct inode *);
1836extern void destroy_inode(struct inode *);
1837extern struct inode *new_inode(struct super_block *);
Jens Axboe01de85e2006-10-17 19:50:36 +02001838extern int should_remove_suid(struct dentry *);
Miklos Szeredi2f1936b2008-06-24 16:50:14 +02001839extern int file_remove_suid(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840
1841extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1842extern void remove_inode_hash(struct inode *);
1843static inline void insert_inode_hash(struct inode *inode) {
1844 __insert_inode_hash(inode, inode->i_ino);
1845}
1846
1847extern struct file * get_empty_filp(void);
1848extern void file_move(struct file *f, struct list_head *list);
1849extern void file_kill(struct file *f);
David Howells93614012006-09-30 20:45:40 +02001850#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851struct bio;
1852extern void submit_bio(int, struct bio *);
1853extern int bdev_read_only(struct block_device *);
David Howells93614012006-09-30 20:45:40 +02001854#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855extern int set_blocksize(struct block_device *, int);
1856extern int sb_set_blocksize(struct super_block *, int);
1857extern int sb_min_blocksize(struct super_block *, int);
Fengguang Wu08d8e972007-10-16 23:30:39 -07001858extern int sb_has_dirty_inodes(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859
1860extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1861extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1862extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001864extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001865extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
Badari Pulavarty027445c2006-09-30 23:28:46 -07001867 unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1869 unsigned long *, loff_t, loff_t *, size_t, size_t);
1870extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1871 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1872extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1873extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
Dmitriy Monakhov0ceb3312007-05-08 00:23:02 -07001874extern int generic_segment_checks(const struct iovec *iov,
1875 unsigned long *nr_segs, size_t *count, int access_flags);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001876
1877/* fs/splice.c */
Jens Axboecbb7e572006-04-11 14:57:50 +02001878extern ssize_t generic_file_splice_read(struct file *, loff_t *,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001879 struct pipe_inode_info *, size_t, unsigned int);
1880extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
Jens Axboecbb7e572006-04-11 14:57:50 +02001881 struct file *, loff_t *, size_t, unsigned int);
Mark Fasheh6da61802006-10-17 18:43:07 +02001882extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1883 struct file *, loff_t *, size_t, unsigned int);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001884extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
Jens Axboecbb7e572006-04-11 14:57:50 +02001885 struct file *out, loff_t *, size_t len, unsigned int flags);
1886extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001887 size_t len, unsigned int flags);
1888
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889extern void
1890file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1892extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
Andi Kleen9465efc2008-06-27 11:05:24 +02001893extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
1894 int origin);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895extern int generic_file_open(struct inode * inode, struct file * filp);
1896extern int nonseekable_open(struct inode * inode, struct file * filp);
1897
Carsten Otteceffc072005-06-23 22:05:25 -07001898#ifdef CONFIG_FS_XIP
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07001899extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1900 loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07001901extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07001902extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1903 size_t len, loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07001904extern int xip_truncate_page(struct address_space *mapping, loff_t from);
Carsten Otte6d791252005-06-23 22:05:26 -07001905#else
1906static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1907{
1908 return 0;
1909}
Carsten Otteceffc072005-06-23 22:05:25 -07001910#endif
1911
David Howells93614012006-09-30 20:45:40 +02001912#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1914 struct block_device *bdev, const struct iovec *iov, loff_t offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001915 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 int lock_type);
1917
1918enum {
1919 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1920 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1921 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1922};
1923
1924static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1925 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001926 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 dio_iodone_t end_io)
1928{
1929 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001930 nr_segs, get_block, end_io, DIO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931}
1932
1933static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1934 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001935 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 dio_iodone_t end_io)
1937{
1938 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001939 nr_segs, get_block, end_io, DIO_NO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940}
1941
1942static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1943 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001944 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 dio_iodone_t end_io)
1946{
1947 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001948 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949}
David Howells93614012006-09-30 20:45:40 +02001950#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001952extern const struct file_operations generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
1954#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1955
1956extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1957extern int vfs_follow_link(struct nameidata *, const char *);
1958extern int page_readlink(struct dentry *, char __user *, int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001959extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1960extern void page_put_link(struct dentry *, struct nameidata *, void *);
Kirill Korotaev0adb25d2006-03-11 03:27:13 -08001961extern int __page_symlink(struct inode *inode, const char *symname, int len,
1962 gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963extern int page_symlink(struct inode *inode, const char *symname, int len);
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001964extern const struct inode_operations page_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965extern int generic_readlink(struct dentry *, char __user *, int);
1966extern void generic_fillattr(struct inode *, struct kstat *);
1967extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1968void inode_add_bytes(struct inode *inode, loff_t bytes);
1969void inode_sub_bytes(struct inode *inode, loff_t bytes);
1970loff_t inode_get_bytes(struct inode *inode);
1971void inode_set_bytes(struct inode *inode, loff_t bytes);
1972
1973extern int vfs_readdir(struct file *, filldir_t, void *);
1974
1975extern int vfs_stat(char __user *, struct kstat *);
1976extern int vfs_lstat(char __user *, struct kstat *);
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001977extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
1978extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979extern int vfs_fstat(unsigned int, struct kstat *);
1980
Erez Zadokdeb21db2008-02-07 00:13:25 -08001981extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
1982 unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983
Miklos Szeredic18479f2007-10-18 23:39:11 -07001984extern void get_filesystem(struct file_system_type *fs);
1985extern void put_filesystem(struct file_system_type *fs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986extern struct file_system_type *get_fs_type(const char *name);
1987extern struct super_block *get_super(struct block_device *);
1988extern struct super_block *user_get_super(dev_t);
1989extern void drop_super(struct super_block *sb);
1990
1991extern int dcache_dir_open(struct inode *, struct file *);
1992extern int dcache_dir_close(struct inode *, struct file *);
1993extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1994extern int dcache_readdir(struct file *, void *, filldir_t);
1995extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells726c3342006-06-23 02:02:58 -07001996extern int simple_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1998extern int simple_unlink(struct inode *, struct dentry *);
1999extern int simple_rmdir(struct inode *, struct dentry *);
2000extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2001extern int simple_sync_file(struct file *, struct dentry *, int);
2002extern int simple_empty(struct dentry *);
2003extern int simple_readpage(struct file *file, struct page *page);
2004extern int simple_prepare_write(struct file *file, struct page *page,
2005 unsigned offset, unsigned to);
Nick Pigginafddba42007-10-16 01:25:01 -07002006extern int simple_write_begin(struct file *file, struct address_space *mapping,
2007 loff_t pos, unsigned len, unsigned flags,
2008 struct page **pagep, void **fsdata);
2009extern int simple_write_end(struct file *file, struct address_space *mapping,
2010 loff_t pos, unsigned len, unsigned copied,
2011 struct page *page, void *fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012
2013extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
2014extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002015extern const struct file_operations simple_dir_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002016extern const struct inode_operations simple_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002017struct tree_descr { char *name; const struct file_operations *ops; int mode; };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018struct dentry *d_alloc_name(struct dentry *, const char *);
2019extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -04002020extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021extern void simple_release_fs(struct vfsmount **mount, int *count);
2022
Akinobu Mita93b07112008-06-05 22:46:21 -07002023extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2024 loff_t *ppos, const void *from, size_t available);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025
Christoph Lametere965f962006-02-01 03:05:41 -08002026#ifdef CONFIG_MIGRATION
Christoph Lameter2d1db3b2006-06-23 02:03:33 -07002027extern int buffer_migrate_page(struct address_space *,
2028 struct page *, struct page *);
Christoph Lametere965f962006-02-01 03:05:41 -08002029#else
2030#define buffer_migrate_page NULL
2031#endif
2032
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033extern int inode_change_ok(struct inode *, struct iattr *);
2034extern int __must_check inode_setattr(struct inode *, struct iattr *);
2035
Christoph Hellwig870f4812006-01-09 20:52:01 -08002036extern void file_update_time(struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037
Miklos Szeredib3b304a2008-02-08 04:21:35 -08002038extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2039extern void save_mount_options(struct super_block *sb, char *options);
2040
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041static inline ino_t parent_ino(struct dentry *dentry)
2042{
2043 ino_t res;
2044
2045 spin_lock(&dentry->d_lock);
2046 res = dentry->d_parent->d_inode->i_ino;
2047 spin_unlock(&dentry->d_lock);
2048 return res;
2049}
2050
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051/* Transaction based IO helpers */
2052
2053/*
2054 * An argresp is stored in an allocated page and holds the
2055 * size of the argument or response, along with its content
2056 */
2057struct simple_transaction_argresp {
2058 ssize_t size;
2059 char data[0];
2060};
2061
2062#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2063
2064char *simple_transaction_get(struct file *file, const char __user *buf,
2065 size_t size);
2066ssize_t simple_transaction_read(struct file *file, char __user *buf,
2067 size_t size, loff_t *pos);
2068int simple_transaction_release(struct inode *inode, struct file *file);
2069
2070static inline void simple_transaction_set(struct file *file, size_t n)
2071{
2072 struct simple_transaction_argresp *ar = file->private_data;
2073
2074 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
2075
2076 /*
2077 * The barrier ensures that ar->size will really remain zero until
2078 * ar->data is ready for reading.
2079 */
2080 smp_mb();
2081 ar->size = n;
2082}
2083
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002084/*
2085 * simple attribute files
2086 *
2087 * These attributes behave similar to those in sysfs:
2088 *
2089 * Writing to an attribute immediately sets a value, an open file can be
2090 * written to multiple times.
2091 *
2092 * Reading from an attribute creates a buffer from the value that might get
2093 * read with multiple read calls. When the attribute has been read
2094 * completely, no further read calls are possible until the file is opened
2095 * again.
2096 *
2097 * All attributes contain a text representation of a numeric value
2098 * that are accessed with the get() and set() functions.
2099 */
2100#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2101static int __fops ## _open(struct inode *inode, struct file *file) \
2102{ \
2103 __simple_attr_check_format(__fmt, 0ull); \
2104 return simple_attr_open(inode, file, __get, __set, __fmt); \
2105} \
2106static struct file_operations __fops = { \
2107 .owner = THIS_MODULE, \
2108 .open = __fops ## _open, \
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002109 .release = simple_attr_release, \
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002110 .read = simple_attr_read, \
2111 .write = simple_attr_write, \
2112};
2113
2114static inline void __attribute__((format(printf, 1, 2)))
2115__simple_attr_check_format(const char *fmt, ...)
2116{
2117 /* don't do anything, just let the compiler check the arguments; */
2118}
2119
2120int simple_attr_open(struct inode *inode, struct file *file,
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002121 int (*get)(void *, u64 *), int (*set)(void *, u64),
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002122 const char *fmt);
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002123int simple_attr_release(struct inode *inode, struct file *file);
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002124ssize_t simple_attr_read(struct file *file, char __user *buf,
2125 size_t len, loff_t *ppos);
2126ssize_t simple_attr_write(struct file *file, const char __user *buf,
2127 size_t len, loff_t *ppos);
2128
2129
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130#ifdef CONFIG_SECURITY
2131static inline char *alloc_secdata(void)
2132{
2133 return (char *)get_zeroed_page(GFP_KERNEL);
2134}
2135
2136static inline void free_secdata(void *secdata)
2137{
2138 free_page((unsigned long)secdata);
2139}
2140#else
2141static inline char *alloc_secdata(void)
2142{
2143 return (char *)1;
2144}
2145
2146static inline void free_secdata(void *secdata)
2147{ }
2148#endif /* CONFIG_SECURITY */
2149
Alexey Dobriyan4be28542007-10-16 23:26:21 -07002150struct ctl_table;
2151int proc_nr_files(struct ctl_table *table, int write, struct file *filp,
Adrian Bunk62239ac2007-07-17 04:03:45 -07002152 void __user *buffer, size_t *lenp, loff_t *ppos);
2153
Adrian Bunk011e3fc2008-02-06 01:36:47 -08002154int get_filesystem_list(char * buf);
Adrian Bunk62239ac2007-07-17 04:03:45 -07002155
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156#endif /* __KERNEL__ */
2157#endif /* _LINUX_FS_H */