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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
25
26#define BLOCK_SIZE_BITS 10
27#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
28
David Howells01bf4662006-07-10 04:44:53 -070029#define SEEK_SET 0 /* seek relative to beginning of file */
30#define SEEK_CUR 1 /* seek relative to current file position */
31#define SEEK_END 2 /* seek relative to end of file */
Chris Snook1ae70752007-05-08 00:24:15 -070032#define SEEK_MAX SEEK_END
David Howells01bf4662006-07-10 04:44:53 -070033
Linus Torvalds1da177e2005-04-16 15:20:36 -070034/* And dynamically-tunable limits and defaults: */
35struct files_stat_struct {
36 int nr_files; /* read only */
37 int nr_free_files; /* read only */
38 int max_files; /* tunable */
39};
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41struct inodes_stat_t {
42 int nr_inodes;
43 int nr_unused;
Stefan Richter9e7bf242007-07-15 23:40:25 -070044 int dummy[5]; /* padding for sysctl ABI compatibility */
Linus Torvalds1da177e2005-04-16 15:20:36 -070045};
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#define NR_FILE 8192 /* this can well be larger on a larger system */
49
50#define MAY_EXEC 1
51#define MAY_WRITE 2
52#define MAY_READ 4
53#define MAY_APPEND 8
Al Viroe6305c42008-07-15 21:03:57 -040054#define MAY_ACCESS 16
Al Viroa1103432008-07-17 09:19:08 -040055#define MAY_OPEN 32
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Paul Turner55ec8212009-02-18 14:48:15 -080057/*
58 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
59 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
60 */
61
Christoph Hellwigfc9161e2008-11-05 14:58:46 +010062/* file is open for reading */
63#define FMODE_READ ((__force fmode_t)1)
64/* file is open for writing */
65#define FMODE_WRITE ((__force fmode_t)2)
66/* file is seekable */
67#define FMODE_LSEEK ((__force fmode_t)4)
Paul Turner55ec8212009-02-18 14:48:15 -080068/* file can be accessed using pread */
Christoph Hellwigfc9161e2008-11-05 14:58:46 +010069#define FMODE_PREAD ((__force fmode_t)8)
Paul Turner55ec8212009-02-18 14:48:15 -080070/* file can be accessed using pwrite */
71#define FMODE_PWRITE ((__force fmode_t)16)
Christoph Hellwigfc9161e2008-11-05 14:58:46 +010072/* File is opened for execution with sys_execve / sys_uselib */
Paul Turner55ec8212009-02-18 14:48:15 -080073#define FMODE_EXEC ((__force fmode_t)32)
Christoph Hellwigfc9161e2008-11-05 14:58:46 +010074/* File is opened with O_NDELAY (only set for block devices) */
Paul Turner55ec8212009-02-18 14:48:15 -080075#define FMODE_NDELAY ((__force fmode_t)64)
Christoph Hellwigfc9161e2008-11-05 14:58:46 +010076/* File is opened with O_EXCL (only set for block devices) */
Paul Turner55ec8212009-02-18 14:48:15 -080077#define FMODE_EXCL ((__force fmode_t)128)
Christoph Hellwigfc9161e2008-11-05 14:58:46 +010078/* File is opened using open(.., 3, ..) and is writeable only for ioctls
79 (specialy hack for floppy.c) */
Paul Turner55ec8212009-02-18 14:48:15 -080080#define FMODE_WRITE_IOCTL ((__force fmode_t)256)
Oleg Drokinb5005312006-03-25 03:07:01 -080081
Christoph Hellwig4d4be482008-12-09 04:47:33 -050082/*
83 * Don't update ctime and mtime.
84 *
85 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
86 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
87 */
88#define FMODE_NOCMTIME ((__force fmode_t)2048)
89
Jens Axboe48e70bc2009-04-14 08:19:27 +020090/*
91 * The below are the various read and write types that we support. Some of
92 * them include behavioral modifiers that send information down to the
93 * block layer and IO scheduler. Terminology:
94 *
95 * The block layer uses device plugging to defer IO a little bit, in
96 * the hope that we will see more IO very shortly. This increases
97 * coalescing of adjacent IO and thus reduces the number of IOs we
98 * have to send to the device. It also allows for better queuing,
99 * if the IO isn't mergeable. If the caller is going to be waiting
100 * for the IO, then he must ensure that the device is unplugged so
101 * that the IO is dispatched to the driver.
102 *
103 * All IO is handled async in Linux. This is fine for background
104 * writes, but for reads or writes that someone waits for completion
105 * on, we want to notify the block layer and IO scheduler so that they
106 * know about it. That allows them to make better scheduling
107 * decisions. So when the below references 'sync' and 'async', it
108 * is referencing this priority hint.
109 *
110 * With that in mind, the available types are:
111 *
112 * READ A normal read operation. Device will be plugged.
113 * READ_SYNC A synchronous read. Device is not plugged, caller can
114 * immediately wait on this read without caring about
115 * unplugging.
116 * READA Used for read-ahead operations. Lower priority, and the
117 * block layer could (in theory) choose to ignore this
118 * request if it runs into resource problems.
119 * WRITE A normal async write. Device will be plugged.
120 * SWRITE Like WRITE, but a special case for ll_rw_block() that
121 * tells it to lock the buffer first. Normally a buffer
122 * must be locked before doing IO.
123 * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down
124 * the hint that someone will be waiting on this IO
125 * shortly. The device must still be unplugged explicitly,
126 * WRITE_SYNC_PLUG does not do this as we could be
127 * submitting more writes before we actually wait on any
128 * of them.
129 * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device
130 * immediately after submission. The write equivalent
131 * of READ_SYNC.
132 * WRITE_ODIRECT Special case write for O_DIRECT only.
133 * SWRITE_SYNC
134 * SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
135 * See SWRITE.
136 * WRITE_BARRIER Like WRITE, but tells the block layer that all
137 * previously submitted writes must be safely on storage
138 * before this one is started. Also guarantees that when
139 * this write is complete, it itself is also safely on
140 * storage. Prevents reordering of writes on both sides
141 * of this IO.
142 *
143 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144#define RW_MASK 1
145#define RWA_MASK 2
146#define READ 0
147#define WRITE 1
148#define READA 2 /* read-ahead - don't block if no resources */
Jan Karaa7662232005-09-06 15:19:10 -0700149#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
Jens Axboe93dbb392009-02-16 10:25:40 +0100150#define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
Jens Axboe5404bc72006-08-10 09:01:02 +0200151#define READ_META (READ | (1 << BIO_RW_META))
Jens Axboeaeb6faf2009-04-06 14:48:07 +0200152#define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
153#define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
154#define WRITE_ODIRECT (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
Jens Axboea1f24252009-04-06 14:48:02 +0200155#define SWRITE_SYNC_PLUG \
Jens Axboeaeb6faf2009-04-06 14:48:07 +0200156 (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
157#define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
David Woodhousefb2dce82008-08-05 18:01:53 +0100158#define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
Jens Axboe48e70bc2009-04-14 08:19:27 +0200159
160/*
161 * These aren't really reads or writes, they pass down information about
162 * parts of device that are now unused by the file system.
163 */
David Woodhousee17fc0a2008-08-09 16:42:20 +0100164#define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
165#define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167#define SEL_IN 1
168#define SEL_OUT 2
169#define SEL_EX 4
170
171/* public flags for file_system_type */
172#define FS_REQUIRES_DEV 1
173#define FS_BINARY_MOUNTDATA 2
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -0700174#define FS_HAS_SUBTYPE 4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
Mark Fasheh349457c2006-09-08 14:22:21 -0700176#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
177 * during rename() internally.
178 */
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180/*
181 * These are the fs-independent mount-flags: up to 32 flags are supported
182 */
183#define MS_RDONLY 1 /* Mount read-only */
184#define MS_NOSUID 2 /* Ignore suid and sgid bits */
185#define MS_NODEV 4 /* Disallow access to device special files */
186#define MS_NOEXEC 8 /* Disallow program execution */
187#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
188#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
189#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
190#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
191#define MS_NOATIME 1024 /* Do not update access times. */
192#define MS_NODIRATIME 2048 /* Do not update directory access times */
193#define MS_BIND 4096
194#define MS_MOVE 8192
195#define MS_REC 16384
Theodore Ts'o9b04c992006-03-24 03:15:10 -0800196#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
197 MS_VERBOSE is deprecated. */
198#define MS_SILENT 32768
Miklos Szeredibf066c72006-01-08 01:03:19 -0800199#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
Ram Pai9676f0c2005-11-07 17:21:20 -0500200#define MS_UNBINDABLE (1<<17) /* change to unbindable */
Ram Pai07b20882005-11-07 17:19:07 -0500201#define MS_PRIVATE (1<<18) /* change to private */
Ram Paia58b0eb2005-11-07 17:20:48 -0500202#define MS_SLAVE (1<<19) /* change to slave */
Ram Pai03e06e62005-11-07 17:19:33 -0500203#define MS_SHARED (1<<20) /* change to shared */
Valerie Henson47ae32d2006-12-13 00:34:34 -0800204#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
Pavel Emelyanov8bf97252007-10-18 23:40:02 -0700205#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500206#define MS_I_VERSION (1<<23) /* Update inode I_version field */
Matthew Garrettd0adde52009-03-26 17:49:56 +0000207#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208#define MS_ACTIVE (1<<30)
209#define MS_NOUSER (1<<31)
210
211/*
212 * Superblock flags that can be altered by MS_REMOUNT
213 */
Mimi Zohar08b9fe62008-10-13 00:09:50 -0400214#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216/*
217 * Old magic mount flag and mask
218 */
219#define MS_MGC_VAL 0xC0ED0000
220#define MS_MGC_MSK 0xffff0000
221
222/* Inode flags - they have nothing to superblock flags now */
223
224#define S_SYNC 1 /* Writes are synced at once */
225#define S_NOATIME 2 /* Do not update access times */
226#define S_APPEND 4 /* Append-only file */
227#define S_IMMUTABLE 8 /* Immutable file */
228#define S_DEAD 16 /* removed, but still open directory */
229#define S_NOQUOTA 32 /* Inode is not counted to quota */
230#define S_DIRSYNC 64 /* Directory modifications are synchronous */
231#define S_NOCMTIME 128 /* Do not update file c/mtime */
232#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
233#define S_PRIVATE 512 /* Inode is fs-internal */
234
235/*
236 * Note that nosuid etc flags are inode-specific: setting some file-system
237 * flags just means all the inodes inherit those flags by default. It might be
238 * possible to override it selectively if you really wanted to with some
239 * ioctl() that is not currently implemented.
240 *
241 * Exception: MS_RDONLY is always applied to the entire file system.
242 *
243 * Unfortunately, it is possible to change a filesystems flags with it mounted
244 * with files in use. This means that all of the inodes will not have their
245 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
246 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
247 */
248#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
249
250#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
251#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
252 ((inode)->i_flags & S_SYNC))
253#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
254 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
255#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
Eric Dumazet37756ce2007-02-10 01:44:49 -0800256#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500257#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
260#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
261#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
263
264#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
265#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
266#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
267#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
268
269/* the read-only stuff doesn't really belong here, but any other place is
270 probably as bad and I don't want to create yet another include file. */
271
272#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
273#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
274#define BLKRRPART _IO(0x12,95) /* re-read partition table */
275#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
276#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
277#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
278#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
279#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
280#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
281#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
282#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
283#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
284#if 0
285#define BLKPG _IO(0x12,105)/* See blkpg.h */
286
287/* Some people are morons. Do not use sizeof! */
288
289#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
290#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
291/* This was here just to show that the number is taken -
292 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
293#endif
294/* A jump here: 108-111 have been used for various private purposes. */
295#define BLKBSZGET _IOR(0x12,112,size_t)
296#define BLKBSZSET _IOW(0x12,113,size_t)
297#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
Jens Axboe2056a782006-03-23 20:00:26 +0100298#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
299#define BLKTRACESTART _IO(0x12,116)
300#define BLKTRACESTOP _IO(0x12,117)
301#define BLKTRACETEARDOWN _IO(0x12,118)
David Woodhoused30a2602008-08-11 15:58:42 +0100302#define BLKDISCARD _IO(0x12,119)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
305#define FIBMAP _IO(0x00,1) /* bmap access */
306#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
Takashi Satofcccf502009-01-09 16:40:59 -0800307#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
308#define FITHAW _IOWR('X', 120, int) /* Thaw */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
David Howells36695672006-08-29 19:06:16 +0100310#define FS_IOC_GETFLAGS _IOR('f', 1, long)
311#define FS_IOC_SETFLAGS _IOW('f', 2, long)
312#define FS_IOC_GETVERSION _IOR('v', 1, long)
313#define FS_IOC_SETVERSION _IOW('v', 2, long)
Mark Fashehc4b929b2008-10-08 19:44:18 -0400314#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
David Howells36695672006-08-29 19:06:16 +0100315#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
316#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
317#define FS_IOC32_GETVERSION _IOR('v', 1, int)
318#define FS_IOC32_SETVERSION _IOW('v', 2, int)
319
320/*
321 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
322 */
323#define FS_SECRM_FL 0x00000001 /* Secure deletion */
324#define FS_UNRM_FL 0x00000002 /* Undelete */
325#define FS_COMPR_FL 0x00000004 /* Compress file */
326#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
327#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
328#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
329#define FS_NODUMP_FL 0x00000040 /* do not dump file */
330#define FS_NOATIME_FL 0x00000080 /* do not update atime */
331/* Reserved for compression usage... */
332#define FS_DIRTY_FL 0x00000100
333#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
334#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
335#define FS_ECOMPR_FL 0x00000800 /* Compression error */
336/* End compression flags --- maybe not all used */
337#define FS_BTREE_FL 0x00001000 /* btree format dir */
338#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
339#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
340#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
341#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
342#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
343#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400344#define FS_EXTENT_FL 0x00080000 /* Extents */
345#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
David Howells36695672006-08-29 19:06:16 +0100346#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
347
348#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
349#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
350
351
Andrew Mortone46e4902006-05-22 22:35:24 -0700352#define SYNC_FILE_RANGE_WAIT_BEFORE 1
353#define SYNC_FILE_RANGE_WRITE 2
354#define SYNC_FILE_RANGE_WAIT_AFTER 4
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356#ifdef __KERNEL__
357
358#include <linux/linkage.h>
359#include <linux/wait.h>
360#include <linux/types.h>
361#include <linux/kdev_t.h>
362#include <linux/dcache.h>
Al Viro3f8206d2008-07-26 03:46:43 -0400363#include <linux/path.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364#include <linux/stat.h>
365#include <linux/cache.h>
366#include <linux/kobject.h>
367#include <linux/list.h>
368#include <linux/radix-tree.h>
369#include <linux/prio_tree.h>
370#include <linux/init.h>
Al Viro914e2632006-10-18 13:55:46 -0400371#include <linux/pid.h>
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800372#include <linux/mutex.h>
Satyam Sharma3bd858a2007-07-17 15:00:08 +0530373#include <linux/capability.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -0400374#include <linux/semaphore.h>
Mark Fashehc4b929b2008-10-08 19:44:18 -0400375#include <linux/fiemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377#include <asm/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378#include <asm/byteorder.h>
379
Christoph Hellwiga5694252007-07-17 04:04:28 -0700380struct export_operations;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800381struct hd_geometry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382struct iovec;
383struct nameidata;
Christoph Hellwig92198f72005-06-23 22:00:59 -0700384struct kiocb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385struct pipe_inode_info;
386struct poll_table_struct;
387struct kstatfs;
388struct vm_area_struct;
389struct vfsmount;
David Howells745ca242008-11-14 10:39:22 +1100390struct cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Denis Cheng74bf17c2007-10-16 23:26:30 -0700392extern void __init inode_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393extern void __init inode_init_early(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394extern void __init files_init(unsigned long);
395
Jan Engelhardtdded4f42008-12-01 14:34:50 -0800396extern struct files_stat_struct files_stat;
397extern int get_max_files(void);
398extern int sysctl_nr_open;
399extern struct inodes_stat_t inodes_stat;
400extern int leases_enable, lease_break_time;
401#ifdef CONFIG_DNOTIFY
402extern int dir_notify_enable;
403#endif
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405struct buffer_head;
406typedef int (get_block_t)(struct inode *inode, sector_t iblock,
407 struct buffer_head *bh_result, int create);
Christoph Hellwig92198f72005-06-23 22:00:59 -0700408typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 ssize_t bytes, void *private);
410
411/*
412 * Attribute flags. These should be or-ed together to figure out what
413 * has been changed!
414 */
Miklos Szeredi9767d742008-07-01 15:01:26 +0200415#define ATTR_MODE (1 << 0)
416#define ATTR_UID (1 << 1)
417#define ATTR_GID (1 << 2)
418#define ATTR_SIZE (1 << 3)
419#define ATTR_ATIME (1 << 4)
420#define ATTR_MTIME (1 << 5)
421#define ATTR_CTIME (1 << 6)
422#define ATTR_ATIME_SET (1 << 7)
423#define ATTR_MTIME_SET (1 << 8)
424#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
425#define ATTR_ATTR_FLAG (1 << 10)
426#define ATTR_KILL_SUID (1 << 11)
427#define ATTR_KILL_SGID (1 << 12)
428#define ATTR_FILE (1 << 13)
429#define ATTR_KILL_PRIV (1 << 14)
430#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
431#define ATTR_TIMES_SET (1 << 16)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433/*
434 * This is the Inode Attributes structure, used for notify_change(). It
435 * uses the above definitions as flags, to know which values have changed.
436 * Also, in this manner, a Filesystem can look at only the values it cares
437 * about. Basically, these are the attributes that the VFS layer can
438 * request to change from the FS layer.
439 *
440 * Derek Atkins <warlord@MIT.EDU> 94-10-20
441 */
442struct iattr {
443 unsigned int ia_valid;
444 umode_t ia_mode;
445 uid_t ia_uid;
446 gid_t ia_gid;
447 loff_t ia_size;
448 struct timespec ia_atime;
449 struct timespec ia_mtime;
450 struct timespec ia_ctime;
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800451
452 /*
453 * Not an attribute, but an auxilary info for filesystems wanting to
454 * implement an ftruncate() like method. NOTE: filesystem should
455 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
456 */
457 struct file *ia_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458};
459
460/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 * Includes for diskquotas.
462 */
463#include <linux/quota.h>
464
Zach Brown994fc28c2005-12-15 14:28:17 -0800465/**
466 * enum positive_aop_returns - aop return codes with specific semantics
467 *
468 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
469 * completed, that the page is still locked, and
470 * should be considered active. The VM uses this hint
471 * to return the page to the active list -- it won't
472 * be a candidate for writeback again in the near
473 * future. Other callers must be careful to unlock
474 * the page if they get this return. Returned by
475 * writepage();
476 *
477 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
478 * unlocked it and the page might have been truncated.
479 * The caller should back up to acquiring a new page and
480 * trying again. The aop will be taking reasonable
481 * precautions not to livelock. If the caller held a page
482 * reference, it should drop it before retrying. Returned
Nick Piggin55144762007-10-16 01:25:26 -0700483 * by readpage().
Zach Brown994fc28c2005-12-15 14:28:17 -0800484 *
485 * address_space_operation functions return these large constants to indicate
486 * special semantics to the caller. These are much larger than the bytes in a
487 * page to allow for functions that return the number of bytes operated on in a
488 * given page.
489 */
490
491enum positive_aop_returns {
492 AOP_WRITEPAGE_ACTIVATE = 0x80000,
493 AOP_TRUNCATED_PAGE = 0x80001,
494};
495
Nick Pigginafddba42007-10-16 01:25:01 -0700496#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
Nick Piggin89e10782007-10-16 01:25:07 -0700497#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
Nick Piggin54566b22009-01-04 12:00:53 -0800498#define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
499 * helper code (eg buffer layer)
500 * to clear GFP_FS from alloc */
Nick Pigginafddba42007-10-16 01:25:01 -0700501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502/*
503 * oh the beauties of C type declarations.
504 */
505struct page;
506struct address_space;
507struct writeback_control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Nick Piggin2f718ff2007-10-16 01:24:59 -0700509struct iov_iter {
510 const struct iovec *iov;
511 unsigned long nr_segs;
512 size_t iov_offset;
513 size_t count;
514};
515
516size_t iov_iter_copy_from_user_atomic(struct page *page,
517 struct iov_iter *i, unsigned long offset, size_t bytes);
518size_t iov_iter_copy_from_user(struct page *page,
519 struct iov_iter *i, unsigned long offset, size_t bytes);
520void iov_iter_advance(struct iov_iter *i, size_t bytes);
Nick Pigginafddba42007-10-16 01:25:01 -0700521int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700522size_t iov_iter_single_seg_count(struct iov_iter *i);
523
524static inline void iov_iter_init(struct iov_iter *i,
525 const struct iovec *iov, unsigned long nr_segs,
526 size_t count, size_t written)
527{
528 i->iov = iov;
529 i->nr_segs = nr_segs;
530 i->iov_offset = 0;
531 i->count = count + written;
532
533 iov_iter_advance(i, written);
534}
535
536static inline size_t iov_iter_count(struct iov_iter *i)
537{
538 return i->count;
539}
540
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700541/*
542 * "descriptor" for what we're up to with a read.
543 * This allows us to use the same read code yet
544 * have multiple different users of the data that
545 * we read from a file.
546 *
547 * The simplest case just copies the data to user
548 * mode.
549 */
550typedef struct {
551 size_t written;
552 size_t count;
553 union {
554 char __user *buf;
555 void *data;
556 } arg;
557 int error;
558} read_descriptor_t;
559
560typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
561 unsigned long, unsigned long);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563struct address_space_operations {
564 int (*writepage)(struct page *page, struct writeback_control *wbc);
565 int (*readpage)(struct file *, struct page *);
NeilBrown3978d7172006-03-26 01:37:17 -0800566 void (*sync_page)(struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
568 /* Write back some dirty pages from this mapping. */
569 int (*writepages)(struct address_space *, struct writeback_control *);
570
Andrew Morton4741c9f2006-03-24 03:18:11 -0800571 /* Set a page dirty. Return true if this dirtied it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 int (*set_page_dirty)(struct page *page);
573
574 int (*readpages)(struct file *filp, struct address_space *mapping,
575 struct list_head *pages, unsigned nr_pages);
576
Nick Pigginafddba42007-10-16 01:25:01 -0700577 int (*write_begin)(struct file *, struct address_space *mapping,
578 loff_t pos, unsigned len, unsigned flags,
579 struct page **pagep, void **fsdata);
580 int (*write_end)(struct file *, struct address_space *mapping,
581 loff_t pos, unsigned len, unsigned copied,
582 struct page *page, void *fsdata);
583
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
585 sector_t (*bmap)(struct address_space *, sector_t);
NeilBrown2ff28e22006-03-26 01:37:18 -0800586 void (*invalidatepage) (struct page *, unsigned long);
Al Viro27496a82005-10-21 03:20:48 -0400587 int (*releasepage) (struct page *, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
589 loff_t offset, unsigned long nr_segs);
Nick Piggin70688e42008-04-28 02:13:02 -0700590 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
591 void **, unsigned long *);
Christoph Lametere965f962006-02-01 03:05:41 -0800592 /* migrate the contents of a page to the specified target */
Christoph Lameter2d1db3b2006-06-23 02:03:33 -0700593 int (*migratepage) (struct address_space *,
594 struct page *, struct page *);
Trond Myklebuste3db7692007-01-10 23:15:39 -0800595 int (*launder_page) (struct page *);
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700596 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
597 unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598};
599
Nick Pigginafddba42007-10-16 01:25:01 -0700600/*
601 * pagecache_write_begin/pagecache_write_end must be used by general code
602 * to write into the pagecache.
603 */
604int pagecache_write_begin(struct file *, struct address_space *mapping,
605 loff_t pos, unsigned len, unsigned flags,
606 struct page **pagep, void **fsdata);
607
608int pagecache_write_end(struct file *, struct address_space *mapping,
609 loff_t pos, unsigned len, unsigned copied,
610 struct page *page, void *fsdata);
611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612struct backing_dev_info;
613struct address_space {
614 struct inode *host; /* owner: inode, block_device */
615 struct radix_tree_root page_tree; /* radix tree of all pages */
Nick Piggin19fd6232008-07-25 19:45:32 -0700616 spinlock_t tree_lock; /* and lock protecting it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
618 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
619 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
620 spinlock_t i_mmap_lock; /* protect tree, count, list */
621 unsigned int truncate_count; /* Cover race condition with truncate */
622 unsigned long nrpages; /* number of total pages */
623 pgoff_t writeback_index;/* writeback starts here */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700624 const struct address_space_operations *a_ops; /* methods */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 unsigned long flags; /* error bits/gfp mask */
626 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
627 spinlock_t private_lock; /* for use by the address_space */
628 struct list_head private_list; /* ditto */
629 struct address_space *assoc_mapping; /* ditto */
630} __attribute__((aligned(sizeof(long))));
631 /*
632 * On most architectures that alignment is already the case; but
633 * must be enforced here for CRIS, to let the least signficant bit
634 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
635 */
636
637struct block_device {
638 dev_t bd_dev; /* not a kdev_t - it's a search key */
639 struct inode * bd_inode; /* will die */
Theodore Ts'o87d8fe12009-01-03 09:47:09 -0500640 struct super_block * bd_super;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 int bd_openers;
Arjan van de Venc039e312006-03-23 03:00:28 -0800642 struct mutex bd_mutex; /* open/close mutex */
David Chinnerf73ca1b2007-01-10 23:15:41 -0800643 struct semaphore bd_mount_sem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 struct list_head bd_inodes;
645 void * bd_holder;
646 int bd_holders;
Jun'ichi Nomura641dc632006-03-27 01:17:57 -0800647#ifdef CONFIG_SYSFS
648 struct list_head bd_holder_list;
649#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 struct block_device * bd_contains;
651 unsigned bd_block_size;
652 struct hd_struct * bd_part;
653 /* number of times partitions within this device have been opened. */
654 unsigned bd_part_count;
655 int bd_invalidated;
656 struct gendisk * bd_disk;
657 struct list_head bd_list;
658 struct backing_dev_info *bd_inode_backing_dev_info;
659 /*
660 * Private data. You must have bd_claim'ed the block_device
661 * to use this. NOTE: bd_claim allows an owner to claim
662 * the same device multiple times, the owner must take special
663 * care to not mess up bd_private for that case.
664 */
665 unsigned long bd_private;
Takashi Satofcccf502009-01-09 16:40:59 -0800666
667 /* The counter of freeze processes */
668 int bd_fsfreeze_count;
669 /* Mutex for freeze */
670 struct mutex bd_fsfreeze_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671};
672
673/*
674 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
675 * radix trees
676 */
677#define PAGECACHE_TAG_DIRTY 0
678#define PAGECACHE_TAG_WRITEBACK 1
679
680int mapping_tagged(struct address_space *mapping, int tag);
681
682/*
683 * Might pages of this file be mapped into userspace?
684 */
685static inline int mapping_mapped(struct address_space *mapping)
686{
687 return !prio_tree_empty(&mapping->i_mmap) ||
688 !list_empty(&mapping->i_mmap_nonlinear);
689}
690
691/*
692 * Might pages of this file have been modified in userspace?
693 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
694 * marks vma as VM_SHARED if it is shared, and the file was opened for
695 * writing i.e. vma may be mprotected writable even if now readonly.
696 */
697static inline int mapping_writably_mapped(struct address_space *mapping)
698{
699 return mapping->i_mmap_writable != 0;
700}
701
702/*
703 * Use sequence counter to get consistent i_size on 32-bit processors.
704 */
705#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
706#include <linux/seqlock.h>
707#define __NEED_I_SIZE_ORDERED
708#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
709#else
710#define i_size_ordered_init(inode) do { } while (0)
711#endif
712
713struct inode {
714 struct hlist_node i_hash;
715 struct list_head i_list;
716 struct list_head i_sb_list;
717 struct list_head i_dentry;
718 unsigned long i_ino;
719 atomic_t i_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 unsigned int i_nlink;
721 uid_t i_uid;
722 gid_t i_gid;
723 dev_t i_rdev;
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500724 u64 i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 loff_t i_size;
Eric Dumazet83b7b442006-12-06 20:38:53 -0800726#ifdef __NEED_I_SIZE_ORDERED
727 seqcount_t i_size_seqcount;
728#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 struct timespec i_atime;
730 struct timespec i_mtime;
731 struct timespec i_ctime;
732 unsigned int i_blkbits;
Takashi Satoa0f62ac2006-03-26 01:37:52 -0800733 blkcnt_t i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 unsigned short i_bytes;
Arnaldo Carvalho de Melo12d40e42006-12-06 20:39:53 -0800735 umode_t i_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800737 struct mutex i_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 struct rw_semaphore i_alloc_sem;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800739 const struct inode_operations *i_op;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800740 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 struct super_block *i_sb;
742 struct file_lock *i_flock;
743 struct address_space *i_mapping;
744 struct address_space i_data;
745#ifdef CONFIG_QUOTA
746 struct dquot *i_dquot[MAXQUOTAS];
747#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 struct list_head i_devices;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700749 union {
750 struct pipe_inode_info *i_pipe;
Theodore Ts'oeaf796e2006-09-27 01:50:48 -0700751 struct block_device *i_bdev;
Theodore Ts'o577c4eb2006-09-27 01:50:49 -0700752 struct cdev *i_cdev;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700753 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 int i_cindex;
755
756 __u32 i_generation;
757
758#ifdef CONFIG_DNOTIFY
759 unsigned long i_dnotify_mask; /* Directory notify events */
760 struct dnotify_struct *i_dnotify; /* for directory notifications */
761#endif
762
Robert Love0eeca282005-07-12 17:06:03 -0400763#ifdef CONFIG_INOTIFY
764 struct list_head inotify_watches; /* watches on this inode */
Ingo Molnard4f9af92006-03-23 03:00:30 -0800765 struct mutex inotify_mutex; /* protects the watches list */
Robert Love0eeca282005-07-12 17:06:03 -0400766#endif
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 unsigned long i_state;
769 unsigned long dirtied_when; /* jiffies of first dirtying */
770
771 unsigned int i_flags;
772
773 atomic_t i_writecount;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700774#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 void *i_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700776#endif
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700777 void *i_private; /* fs or device private pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778};
779
780/*
Ingo Molnarf2eace22006-07-03 00:25:05 -0700781 * inode->i_mutex nesting subclasses for the lock validator:
782 *
783 * 0: the object of the current VFS operation
784 * 1: parent
785 * 2: child/target
786 * 3: quota file
787 *
788 * The locking order between these classes is
Ingo Molnar4df46242006-08-27 01:23:56 -0700789 * parent -> child -> normal -> xattr -> quota
Ingo Molnarf2eace22006-07-03 00:25:05 -0700790 */
791enum inode_i_mutex_lock_class
792{
793 I_MUTEX_NORMAL,
794 I_MUTEX_PARENT,
795 I_MUTEX_CHILD,
Ingo Molnar4df46242006-08-27 01:23:56 -0700796 I_MUTEX_XATTR,
Ingo Molnarf2eace22006-07-03 00:25:05 -0700797 I_MUTEX_QUOTA
798};
799
800/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 * NOTE: in a 32bit arch with a preemptable kernel and
802 * an UP compile the i_size_read/write must be atomic
803 * with respect to the local cpu (unlike with preempt disabled),
804 * but they don't need to be atomic with respect to other cpus like in
805 * true SMP (so they need either to either locally disable irq around
806 * the read or for example on x86 they can be still implemented as a
807 * cmpxchg8b without the need of the lock prefix). For SMP compiles
808 * and 64bit archs it makes no difference if preempt is enabled or not.
809 */
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800810static inline loff_t i_size_read(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811{
812#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
813 loff_t i_size;
814 unsigned int seq;
815
816 do {
817 seq = read_seqcount_begin(&inode->i_size_seqcount);
818 i_size = inode->i_size;
819 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
820 return i_size;
821#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
822 loff_t i_size;
823
824 preempt_disable();
825 i_size = inode->i_size;
826 preempt_enable();
827 return i_size;
828#else
829 return inode->i_size;
830#endif
831}
832
Miklos Szeredi7762f5a2006-10-17 00:10:07 -0700833/*
834 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
835 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
836 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
837 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838static inline void i_size_write(struct inode *inode, loff_t i_size)
839{
840#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
841 write_seqcount_begin(&inode->i_size_seqcount);
842 inode->i_size = i_size;
843 write_seqcount_end(&inode->i_size_seqcount);
844#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
845 preempt_disable();
846 inode->i_size = i_size;
847 preempt_enable();
848#else
849 inode->i_size = i_size;
850#endif
851}
852
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800853static inline unsigned iminor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
855 return MINOR(inode->i_rdev);
856}
857
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800858static inline unsigned imajor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859{
860 return MAJOR(inode->i_rdev);
861}
862
863extern struct block_device *I_BDEV(struct inode *inode);
864
865struct fown_struct {
866 rwlock_t lock; /* protects pid, uid, euid fields */
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700867 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
868 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 uid_t uid, euid; /* uid/euid of process setting the owner */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 int signum; /* posix.1b rt signal to be delivered on IO */
871};
872
873/*
874 * Track a single file's readahead state
875 */
876struct file_ra_state {
Fengguang Wu937085a2007-10-16 01:24:31 -0700877 pgoff_t start; /* where readahead started */
878 unsigned int size; /* # of readahead pages */
879 unsigned int async_size; /* do asynchronous readahead when
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700880 there are only # of pages ahead */
Fengguang Wu5ce11102007-07-19 01:47:59 -0700881
Fengguang Wu937085a2007-10-16 01:24:31 -0700882 unsigned int ra_pages; /* Maximum readahead window */
Fengguang Wu0bb7ba62007-10-16 01:24:32 -0700883 int mmap_miss; /* Cache miss stat for mmap accesses */
Fengguang Wuf4e6b492007-10-16 01:24:33 -0700884 loff_t prev_pos; /* Cache last read() position */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Fengguang Wu5ce11102007-07-19 01:47:59 -0700887/*
Fengguang Wu5ce11102007-07-19 01:47:59 -0700888 * Check if @index falls in the readahead windows.
889 */
890static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
891{
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700892 return (index >= ra->start &&
893 index < ra->start + ra->size);
Fengguang Wu5ce11102007-07-19 01:47:59 -0700894}
895
Dave Hansenad775f52008-02-15 14:38:01 -0800896#define FILE_MNT_WRITE_TAKEN 1
897#define FILE_MNT_WRITE_RELEASED 2
898
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899struct file {
Eric Dumazet2f512012005-10-30 15:02:16 -0800900 /*
901 * fu_list becomes invalid after file_free is called and queued via
902 * fu_rcuhead for RCU freeing
903 */
904 union {
905 struct list_head fu_list;
906 struct rcu_head fu_rcuhead;
907 } f_u;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800908 struct path f_path;
909#define f_dentry f_path.dentry
910#define f_vfsmnt f_path.mnt
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800911 const struct file_operations *f_op;
Jonathan Corbet4a6a4492009-03-27 12:24:31 -0600912 spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */
Al Viro516e0cc2008-07-26 00:39:17 -0400913 atomic_long_t f_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 unsigned int f_flags;
Al Viroaeb5d722008-09-02 15:28:45 -0400915 fmode_t f_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 loff_t f_pos;
917 struct fown_struct f_owner;
David Howellsd76b0d92008-11-14 10:39:25 +1100918 const struct cred *f_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 struct file_ra_state f_ra;
920
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -0700921 u64 f_version;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700922#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 void *f_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700924#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 /* needed for tty driver, and maybe others */
926 void *private_data;
927
928#ifdef CONFIG_EPOLL
929 /* Used by fs/eventpoll.c to link all the hooks to this file */
930 struct list_head f_ep_links;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931#endif /* #ifdef CONFIG_EPOLL */
932 struct address_space *f_mapping;
Dave Hansenad775f52008-02-15 14:38:01 -0800933#ifdef CONFIG_DEBUG_WRITECOUNT
934 unsigned long f_mnt_write_state;
935#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936};
937extern spinlock_t files_lock;
938#define file_list_lock() spin_lock(&files_lock);
939#define file_list_unlock() spin_unlock(&files_lock);
940
Al Viro516e0cc2008-07-26 00:39:17 -0400941#define get_file(x) atomic_long_inc(&(x)->f_count)
942#define file_count(x) atomic_long_read(&(x)->f_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Dave Hansenad775f52008-02-15 14:38:01 -0800944#ifdef CONFIG_DEBUG_WRITECOUNT
945static inline void file_take_write(struct file *f)
946{
947 WARN_ON(f->f_mnt_write_state != 0);
948 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
949}
950static inline void file_release_write(struct file *f)
951{
952 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
953}
954static inline void file_reset_write(struct file *f)
955{
956 f->f_mnt_write_state = 0;
957}
958static inline void file_check_state(struct file *f)
959{
960 /*
961 * At this point, either both or neither of these bits
962 * should be set.
963 */
964 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
965 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
966}
967static inline int file_check_writeable(struct file *f)
968{
969 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
970 return 0;
971 printk(KERN_WARNING "writeable file with no "
972 "mnt_want_write()\n");
973 WARN_ON(1);
974 return -EINVAL;
975}
976#else /* !CONFIG_DEBUG_WRITECOUNT */
977static inline void file_take_write(struct file *filp) {}
978static inline void file_release_write(struct file *filp) {}
979static inline void file_reset_write(struct file *filp) {}
980static inline void file_check_state(struct file *filp) {}
981static inline int file_check_writeable(struct file *filp)
982{
983 return 0;
984}
985#endif /* CONFIG_DEBUG_WRITECOUNT */
986
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987#define MAX_NON_LFS ((1UL<<31) - 1)
988
989/* Page cache limit. The filesystems should put that into their s_maxbytes
990 limits, otherwise bad things can happen in VM. */
991#if BITS_PER_LONG==32
992#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
993#elif BITS_PER_LONG==64
994#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
995#endif
996
997#define FL_POSIX 1
998#define FL_FLOCK 2
999#define FL_ACCESS 8 /* not trying to lock, just looking */
Trond Myklebustf475ae92006-06-29 16:38:32 -04001000#define FL_EXISTS 16 /* when unlocking, test for existence */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001#define FL_LEASE 32 /* lease held on this file */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001002#define FL_CLOSE 64 /* unlock on close */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003#define FL_SLEEP 128 /* A blocking lock */
1004
1005/*
Miklos Szeredibde74e42008-07-25 01:48:57 -07001006 * Special return value from posix_lock_file() and vfs_lock_file() for
1007 * asynchronous locking.
1008 */
1009#define FILE_LOCK_DEFERRED 1
1010
1011/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 * The POSIX file lock owner is determined by
1013 * the "struct files_struct" in the thread group
1014 * (or NULL for no owner - BSD locks).
1015 *
1016 * Lockd stuffs a "host" pointer into this.
1017 */
1018typedef struct files_struct *fl_owner_t;
1019
1020struct file_lock_operations {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1022 void (*fl_release_private)(struct file_lock *);
1023};
1024
1025struct lock_manager_operations {
1026 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
1027 void (*fl_notify)(struct file_lock *); /* unblock callback */
Marc Eshel2beb6612006-12-05 23:31:28 -05001028 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1030 void (*fl_release_private)(struct file_lock *);
1031 void (*fl_break)(struct file_lock *);
1032 int (*fl_mylease)(struct file_lock *, struct file_lock *);
1033 int (*fl_change)(struct file_lock **, int);
1034};
1035
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -04001036struct lock_manager {
1037 struct list_head list;
1038};
1039
1040void locks_start_grace(struct lock_manager *);
1041void locks_end_grace(struct lock_manager *);
1042int locks_in_grace(void);
1043
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044/* that will die - we need it for nfs_lock_info */
1045#include <linux/nfs_fs_i.h>
1046
1047struct file_lock {
1048 struct file_lock *fl_next; /* singly linked list for this inode */
1049 struct list_head fl_link; /* doubly linked list of all locks */
1050 struct list_head fl_block; /* circular list of blocked processes */
1051 fl_owner_t fl_owner;
Richard Kennedyafc12462008-07-11 17:20:49 -07001052 unsigned char fl_flags;
1053 unsigned char fl_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 unsigned int fl_pid;
Vitaliy Gusevab1f1612008-01-17 00:07:08 +00001055 struct pid *fl_nspid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 wait_queue_head_t fl_wait;
1057 struct file *fl_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 loff_t fl_start;
1059 loff_t fl_end;
1060
1061 struct fasync_struct * fl_fasync; /* for lease break notifications */
1062 unsigned long fl_break_time; /* for nonblocking lease breaks */
1063
1064 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
1065 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
1066 union {
1067 struct nfs_lock_info nfs_fl;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +00001068 struct nfs4_lock_info nfs4_fl;
David Howellse8d6c552007-07-15 23:40:12 -07001069 struct {
1070 struct list_head link; /* link in AFS vnode's pending_locks list */
1071 int state; /* state of grant or error if -ve */
1072 } afs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 } fl_u;
1074};
1075
1076/* The following constant reflects the upper bound of the file/locking space */
1077#ifndef OFFSET_MAX
1078#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1079#define OFFSET_MAX INT_LIMIT(loff_t)
1080#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1081#endif
1082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083#include <linux/fcntl.h>
1084
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001085extern void send_sigio(struct fown_struct *fown, int fd, int band);
1086
1087/* fs/sync.c */
1088extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
1089 loff_t endbyte, unsigned int flags);
1090
1091#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092extern int fcntl_getlk(struct file *, struct flock __user *);
Peter Staubachc2936212005-07-27 11:45:09 -07001093extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1094 struct flock __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
1096#if BITS_PER_LONG == 32
1097extern int fcntl_getlk64(struct file *, struct flock64 __user *);
Peter Staubachc2936212005-07-27 11:45:09 -07001098extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1099 struct flock64 __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100#endif
1101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1103extern int fcntl_getlease(struct file *filp);
1104
1105/* fs/locks.c */
1106extern void locks_init_lock(struct file_lock *);
1107extern void locks_copy_lock(struct file_lock *, struct file_lock *);
J. Bruce Fields1a747ee2008-04-24 10:08:22 -04001108extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109extern void locks_remove_posix(struct file *, fl_owner_t);
1110extern void locks_remove_flock(struct file *);
J. Bruce Fields6d34ac12007-05-11 16:09:32 -04001111extern void posix_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001112extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113extern int posix_lock_file_wait(struct file *, struct file_lock *);
J. Bruce Fields64a318e2006-01-03 09:55:46 +01001114extern int posix_unblock_lock(struct file *, struct file_lock *);
J. Bruce Fields3ee17ab2007-02-21 00:58:50 -05001115extern int vfs_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001116extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
Marc Eshel9b9d2ab2007-01-18 17:52:58 -05001117extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1119extern int __break_lease(struct inode *inode, unsigned int flags);
1120extern void lease_get_mtime(struct inode *, struct timespec *time);
Christoph Hellwig0af1a452007-07-31 00:39:22 -07001121extern int generic_setlease(struct file *, long, struct file_lock **);
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -04001122extern int vfs_setlease(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123extern int lease_modify(struct file_lock **, int);
1124extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1125extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001126#else /* !CONFIG_FILE_LOCKING */
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001127static inline int fcntl_getlk(struct file *file, struct flock __user *user)
1128{
1129 return -EINVAL;
1130}
1131
1132static inline int fcntl_setlk(unsigned int fd, struct file *file,
1133 unsigned int cmd, struct flock __user *user)
1134{
1135 return -EACCES;
1136}
1137
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001138#if BITS_PER_LONG == 32
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001139static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
1140{
1141 return -EINVAL;
1142}
1143
1144static inline int fcntl_setlk64(unsigned int fd, struct file *file,
1145 unsigned int cmd, struct flock64 __user *user)
1146{
1147 return -EACCES;
1148}
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001149#endif
Steven Whitehousec2aca5e2009-01-20 10:29:45 +00001150static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
1151{
1152 return 0;
1153}
1154
1155static inline int fcntl_getlease(struct file *filp)
1156{
1157 return 0;
1158}
1159
1160static inline void locks_init_lock(struct file_lock *fl)
1161{
1162 return;
1163}
1164
1165static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1166{
1167 return;
1168}
1169
1170static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1171{
1172 return;
1173}
1174
1175static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
1176{
1177 return;
1178}
1179
1180static inline void locks_remove_flock(struct file *filp)
1181{
1182 return;
1183}
1184
1185static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
1186{
1187 return;
1188}
1189
1190static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
1191 struct file_lock *conflock)
1192{
1193 return -ENOLCK;
1194}
1195
1196static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
1197{
1198 return -ENOLCK;
1199}
1200
1201static inline int posix_unblock_lock(struct file *filp,
1202 struct file_lock *waiter)
1203{
1204 return -ENOENT;
1205}
1206
1207static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
1208{
1209 return 0;
1210}
1211
1212static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
1213 struct file_lock *fl, struct file_lock *conf)
1214{
1215 return -ENOLCK;
1216}
1217
1218static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
1219{
1220 return 0;
1221}
1222
1223static inline int flock_lock_file_wait(struct file *filp,
1224 struct file_lock *request)
1225{
1226 return -ENOLCK;
1227}
1228
1229static inline int __break_lease(struct inode *inode, unsigned int mode)
1230{
1231 return 0;
1232}
1233
1234static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
1235{
1236 return;
1237}
1238
1239static inline int generic_setlease(struct file *filp, long arg,
1240 struct file_lock **flp)
1241{
1242 return -EINVAL;
1243}
1244
1245static inline int vfs_setlease(struct file *filp, long arg,
1246 struct file_lock **lease)
1247{
1248 return -EINVAL;
1249}
1250
1251static inline int lease_modify(struct file_lock **before, int arg)
1252{
1253 return -EINVAL;
1254}
1255
1256static inline int lock_may_read(struct inode *inode, loff_t start,
1257 unsigned long len)
1258{
1259 return 1;
1260}
1261
1262static inline int lock_may_write(struct inode *inode, loff_t start,
1263 unsigned long len)
1264{
1265 return 1;
1266}
1267
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001268#endif /* !CONFIG_FILE_LOCKING */
1269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
1271struct fasync_struct {
1272 int magic;
1273 int fa_fd;
1274 struct fasync_struct *fa_next; /* singly linked list */
1275 struct file *fa_file;
1276};
1277
1278#define FASYNC_MAGIC 0x4601
1279
1280/* SMP safe fasync helpers: */
1281extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1282/* can be called from interrupts */
1283extern void kill_fasync(struct fasync_struct **, int, int);
1284/* only for net: no internal synchronization */
1285extern void __kill_fasync(struct fasync_struct *, int, int);
1286
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001287extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288extern int f_setown(struct file *filp, unsigned long arg, int force);
1289extern void f_delown(struct file *filp);
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001290extern pid_t f_getown(struct file *filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291extern int send_sigurg(struct fown_struct *fown);
1292
1293/*
1294 * Umount options
1295 */
1296
1297#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1298#define MNT_DETACH 0x00000002 /* Just detach from the tree */
1299#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1300
1301extern struct list_head super_blocks;
1302extern spinlock_t sb_lock;
1303
Kentaro Makitada3bbdd2008-07-23 21:27:13 -07001304#define sb_entry(list) list_entry((list), struct super_block, s_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305#define S_BIAS (1<<30)
1306struct super_block {
1307 struct list_head s_list; /* Keep this first */
1308 dev_t s_dev; /* search index; _not_ kdev_t */
1309 unsigned long s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 unsigned char s_blocksize_bits;
1311 unsigned char s_dirt;
1312 unsigned long long s_maxbytes; /* Max file size */
1313 struct file_system_type *s_type;
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001314 const struct super_operations *s_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 struct dquot_operations *dq_op;
1316 struct quotactl_ops *s_qcop;
Christoph Hellwig39655162007-10-21 16:42:17 -07001317 const struct export_operations *s_export_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 unsigned long s_flags;
1319 unsigned long s_magic;
1320 struct dentry *s_root;
1321 struct rw_semaphore s_umount;
Ingo Molnar7892f2f2006-01-09 15:59:25 -08001322 struct mutex s_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 int s_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 int s_need_sync_fs;
1325 atomic_t s_active;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001326#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 void *s_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001328#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 struct xattr_handler **s_xattr;
1330
1331 struct list_head s_inodes; /* all inodes */
1332 struct list_head s_dirty; /* dirty inodes */
1333 struct list_head s_io; /* parked for writeback */
Ken Chen0e0f4fc2007-10-16 23:30:38 -07001334 struct list_head s_more_io; /* parked for more writeback */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1336 struct list_head s_files;
Kentaro Makitada3bbdd2008-07-23 21:27:13 -07001337 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1338 struct list_head s_dentry_lru; /* unused dentry lru */
1339 int s_nr_dentry_unused; /* # of dentry on lru */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340
1341 struct block_device *s_bdev;
David Howellsacaebfd2007-05-10 22:51:50 -07001342 struct mtd_info *s_mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 struct list_head s_instances;
1344 struct quota_info s_dquot; /* Diskquota specific options */
1345
1346 int s_frozen;
1347 wait_queue_head_t s_wait_unfrozen;
1348
1349 char s_id[32]; /* Informational name */
1350
1351 void *s_fs_info; /* Filesystem private info */
Al Viro30c40d22008-02-22 19:50:45 -05001352 fmode_t s_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
1354 /*
1355 * The next field is for VFS *only*. No filesystems have any business
1356 * even looking at it. You had been warned.
1357 */
Arjan van de Vena11f3a02006-03-23 03:00:33 -08001358 struct mutex s_vfs_rename_mutex; /* Kludge */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
Kalin KOZHUHAROV8ba8e952006-04-01 01:41:22 +02001360 /* Granularity of c/m/atime in ns.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 Cannot be worse than a second */
1362 u32 s_time_gran;
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001363
1364 /*
1365 * Filesystem subtype. If non-empty the filesystem type field
1366 * in /proc/mounts will be "type.subtype"
1367 */
1368 char *s_subtype;
Miklos Szeredib3b304a2008-02-08 04:21:35 -08001369
1370 /*
1371 * Saved mount options for lazy filesystems using
1372 * generic_show_options()
1373 */
1374 char *s_options;
Arjan van de Venefaee192009-01-06 07:20:54 -08001375
1376 /*
1377 * storage for asynchronous operations
1378 */
1379 struct list_head s_async_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380};
1381
1382extern struct timespec current_fs_time(struct super_block *sb);
1383
1384/*
1385 * Snapshotting support.
1386 */
1387enum {
1388 SB_UNFROZEN = 0,
1389 SB_FREEZE_WRITE = 1,
1390 SB_FREEZE_TRANS = 2,
1391};
1392
1393#define vfs_check_frozen(sb, level) \
1394 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1395
Al Viro914e2632006-10-18 13:55:46 -04001396#define get_fs_excl() atomic_inc(&current->fs_excl)
1397#define put_fs_excl() atomic_dec(&current->fs_excl)
1398#define has_fs_excl() atomic_read(&current->fs_excl)
Jens Axboe22e2c502005-06-27 10:55:12 +02001399
Satyam Sharma3bd858a2007-07-17 15:00:08 +05301400#define is_owner_or_cap(inode) \
David Howellsda9592e2008-11-14 10:39:05 +11001401 ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
Satyam Sharma3bd858a2007-07-17 15:00:08 +05301402
Al Viro914e2632006-10-18 13:55:46 -04001403/* not quite ready to be deprecated, but... */
1404extern void lock_super(struct super_block *);
1405extern void unlock_super(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406
1407/*
1408 * VFS helper functions..
1409 */
1410extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1411extern int vfs_mkdir(struct inode *, struct dentry *, int);
1412extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
Miklos Szeredidb2e7472008-06-24 16:50:16 +02001413extern int vfs_symlink(struct inode *, struct dentry *, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1415extern int vfs_rmdir(struct inode *, struct dentry *);
1416extern int vfs_unlink(struct inode *, struct dentry *);
1417extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1418
1419/*
1420 * VFS dentry helper functions.
1421 */
1422extern void dentry_unhash(struct dentry *dentry);
1423
1424/*
Christoph Hellwig8c744fb2005-11-08 21:35:04 -08001425 * VFS file helper functions.
1426 */
1427extern int file_permission(struct file *, int);
1428
1429/*
Mark Fashehc4b929b2008-10-08 19:44:18 -04001430 * VFS FS_IOC_FIEMAP helper definitions.
1431 */
1432struct fiemap_extent_info {
1433 unsigned int fi_flags; /* Flags as passed from user */
1434 unsigned int fi_extents_mapped; /* Number of mapped extents */
1435 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1436 struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent
1437 * array */
1438};
1439int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1440 u64 phys, u64 len, u32 flags);
1441int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1442
1443/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 * File types
1445 *
1446 * NOTE! These match bits 12..15 of stat.st_mode
1447 * (ie "(i_mode >> 12) & 15").
1448 */
1449#define DT_UNKNOWN 0
1450#define DT_FIFO 1
1451#define DT_CHR 2
1452#define DT_DIR 4
1453#define DT_BLK 6
1454#define DT_REG 8
1455#define DT_LNK 10
1456#define DT_SOCK 12
1457#define DT_WHT 14
1458
1459#define OSYNC_METADATA (1<<0)
1460#define OSYNC_DATA (1<<1)
1461#define OSYNC_INODE (1<<2)
1462int generic_osync_inode(struct inode *, struct address_space *, int);
1463
1464/*
1465 * This is the "filldir" function type, used by readdir() to let
1466 * the kernel specify what kind of dirent layout it wants to have.
1467 * This allows the kernel to read directories into kernel space or
1468 * to have different dirent layouts depending on the binary type.
1469 */
David Howellsafefdbb2006-10-03 01:13:46 -07001470typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
Al Viro08f85852007-10-08 13:26:20 -04001471struct block_device_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473/* These macros are for out of kernel modules to test that
1474 * the kernel supports the unlocked_ioctl and compat_ioctl
1475 * fields in struct file_operations. */
1476#define HAVE_COMPAT_IOCTL 1
1477#define HAVE_UNLOCKED_IOCTL 1
1478
1479/*
1480 * NOTE:
1481 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1482 * can be called without the big kernel lock held in all filesystems.
1483 */
1484struct file_operations {
1485 struct module *owner;
1486 loff_t (*llseek) (struct file *, loff_t, int);
1487 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001489 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1490 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 int (*readdir) (struct file *, void *, filldir_t);
1492 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1493 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1494 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1495 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1496 int (*mmap) (struct file *, struct vm_area_struct *);
1497 int (*open) (struct inode *, struct file *);
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001498 int (*flush) (struct file *, fl_owner_t id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 int (*release) (struct inode *, struct file *);
1500 int (*fsync) (struct file *, struct dentry *, int datasync);
1501 int (*aio_fsync) (struct kiocb *, int datasync);
1502 int (*fasync) (int, struct file *, int);
1503 int (*lock) (struct file *, int, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1505 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1506 int (*check_flags)(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 int (*flock) (struct file *, int, struct file_lock *);
Jens Axboecbb7e572006-04-11 14:57:50 +02001508 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1509 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
J. Bruce Fieldsf9ffed22006-11-14 15:51:40 -05001510 int (*setlease)(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511};
1512
1513struct inode_operations {
1514 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1515 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1516 int (*link) (struct dentry *,struct inode *,struct dentry *);
1517 int (*unlink) (struct inode *,struct dentry *);
1518 int (*symlink) (struct inode *,struct dentry *,const char *);
1519 int (*mkdir) (struct inode *,struct dentry *,int);
1520 int (*rmdir) (struct inode *,struct dentry *);
1521 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1522 int (*rename) (struct inode *, struct dentry *,
1523 struct inode *, struct dentry *);
1524 int (*readlink) (struct dentry *, char __user *,int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001525 void * (*follow_link) (struct dentry *, struct nameidata *);
1526 void (*put_link) (struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 void (*truncate) (struct inode *);
Al Viroe6305c42008-07-15 21:03:57 -04001528 int (*permission) (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 int (*setattr) (struct dentry *, struct iattr *);
1530 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1531 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1532 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1533 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1534 int (*removexattr) (struct dentry *, const char *);
Badari Pulavartyf6b3ec22006-01-06 00:10:38 -08001535 void (*truncate_range)(struct inode *, loff_t, loff_t);
Amit Arora97ac7352007-07-17 21:42:44 -04001536 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1537 loff_t len);
Mark Fashehc4b929b2008-10-08 19:44:18 -04001538 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1539 u64 len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540};
1541
1542struct seq_file;
1543
Badari Pulavartyeed4e512006-09-30 23:28:49 -07001544ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1545 unsigned long nr_segs, unsigned long fast_segs,
1546 struct iovec *fast_pointer,
1547 struct iovec **ret_pointer);
1548
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1550extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1551extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1552 unsigned long, loff_t *);
1553extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1554 unsigned long, loff_t *);
1555
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556struct super_operations {
1557 struct inode *(*alloc_inode)(struct super_block *sb);
1558 void (*destroy_inode)(struct inode *);
1559
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 void (*dirty_inode) (struct inode *);
1561 int (*write_inode) (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 void (*drop_inode) (struct inode *);
1563 void (*delete_inode) (struct inode *);
1564 void (*put_super) (struct super_block *);
1565 void (*write_super) (struct super_block *);
1566 int (*sync_fs)(struct super_block *sb, int wait);
Takashi Satoc4be0c12009-01-09 16:40:58 -08001567 int (*freeze_fs) (struct super_block *);
1568 int (*unfreeze_fs) (struct super_block *);
David Howells726c3342006-06-23 02:02:58 -07001569 int (*statfs) (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 int (*remount_fs) (struct super_block *, int *, char *);
1571 void (*clear_inode) (struct inode *);
Al Viro42faad92008-04-24 07:21:56 -04001572 void (*umount_begin) (struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573
1574 int (*show_options)(struct seq_file *, struct vfsmount *);
Chuck Leverb4629fe2006-03-20 13:44:12 -05001575 int (*show_stats)(struct seq_file *, struct vfsmount *);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001576#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1578 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001579#endif
Theodore Ts'o87d8fe12009-01-03 09:47:09 -05001580 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581};
1582
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001583/*
1584 * Inode state bits. Protected by inode_lock.
1585 *
1586 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1587 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1588 *
1589 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1590 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1591 * various stages of removing an inode.
1592 *
1593 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1594 *
Joern Engele7ca2d42008-02-06 01:36:59 -08001595 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1596 * fdatasync(). i_atime is the usual cause.
Jan Kara000cb482008-02-14 19:31:32 -08001597 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1598 * these changes separately from I_DIRTY_SYNC so that we
1599 * don't have to write inode on fdatasync() when only
1600 * mtime has changed in it.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001601 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1602 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1603 * are cleared by unlock_new_inode(), called from iget().
1604 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1605 * is zero. I_FREEING must be set when I_WILL_FREE is
1606 * cleared.
1607 * I_FREEING Set when inode is about to be freed but still has dirty
1608 * pages or buffers attached or the inode itself is still
1609 * dirty.
1610 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1611 * and can be destroyed.
1612 *
1613 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1614 * prohibited for many purposes. iget() must wait for
1615 * the inode to be completely released, then create it
1616 * anew. Other functions will just ignore such inodes,
1617 * if appropriate. I_LOCK is used for waiting.
1618 *
1619 * I_LOCK Serves as both a mutex and completion notification.
1620 * New inodes set I_LOCK. If two processes both create
1621 * the same inode, one of them will release its inode and
1622 * wait for I_LOCK to be released before returning.
1623 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1624 * also cause waiting on I_LOCK, without I_LOCK actually
1625 * being set. find_inode() uses this to prevent returning
1626 * nearly-dead inodes.
1627 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
Joe Perchesfd3f8982008-02-03 17:45:46 +02001628 * of inode dirty data. Having a separate lock for this
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001629 * purpose reduces latency and prevents some filesystem-
1630 * specific deadlocks.
1631 *
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001632 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1633 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1634 * I_CLEAR? If not, why?
1635 */
1636#define I_DIRTY_SYNC 1
1637#define I_DIRTY_DATASYNC 2
1638#define I_DIRTY_PAGES 4
1639#define I_NEW 8
1640#define I_WILL_FREE 16
1641#define I_FREEING 32
1642#define I_CLEAR 64
1643#define __I_LOCK 7
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644#define I_LOCK (1 << __I_LOCK)
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001645#define __I_SYNC 8
1646#define I_SYNC (1 << __I_SYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647
1648#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1649
1650extern void __mark_inode_dirty(struct inode *, int);
1651static inline void mark_inode_dirty(struct inode *inode)
1652{
1653 __mark_inode_dirty(inode, I_DIRTY);
1654}
1655
1656static inline void mark_inode_dirty_sync(struct inode *inode)
1657{
1658 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1659}
1660
Dave Hansen71c42152007-06-23 17:16:42 -07001661/**
1662 * inc_nlink - directly increment an inode's link count
1663 * @inode: inode
1664 *
1665 * This is a low-level filesystem helper to replace any
1666 * direct filesystem manipulation of i_nlink. Currently,
1667 * it is only here for parity with dec_nlink().
1668 */
Dave Hansend8c76e62006-09-30 23:29:04 -07001669static inline void inc_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001670{
1671 inode->i_nlink++;
Dave Hansend8c76e62006-09-30 23:29:04 -07001672}
1673
1674static inline void inode_inc_link_count(struct inode *inode)
1675{
1676 inc_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001677 mark_inode_dirty(inode);
1678}
1679
Dave Hansen71c42152007-06-23 17:16:42 -07001680/**
1681 * drop_nlink - directly drop an inode's link count
1682 * @inode: inode
1683 *
1684 * This is a low-level filesystem helper to replace any
1685 * direct filesystem manipulation of i_nlink. In cases
1686 * where we are attempting to track writes to the
1687 * filesystem, a decrement to zero means an imminent
1688 * write when the file is truncated and actually unlinked
1689 * on the filesystem.
1690 */
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001691static inline void drop_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001692{
1693 inode->i_nlink--;
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001694}
1695
Dave Hansen71c42152007-06-23 17:16:42 -07001696/**
1697 * clear_nlink - directly zero an inode's link count
1698 * @inode: inode
1699 *
1700 * This is a low-level filesystem helper to replace any
1701 * direct filesystem manipulation of i_nlink. See
1702 * drop_nlink() for why we care about i_nlink hitting zero.
1703 */
Dave Hansence71ec32006-09-30 23:29:06 -07001704static inline void clear_nlink(struct inode *inode)
1705{
1706 inode->i_nlink = 0;
1707}
1708
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001709static inline void inode_dec_link_count(struct inode *inode)
1710{
1711 drop_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001712 mark_inode_dirty(inode);
1713}
1714
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001715/**
1716 * inode_inc_iversion - increments i_version
1717 * @inode: inode that need to be updated
1718 *
1719 * Every time the inode is modified, the i_version field will be incremented.
1720 * The filesystem has to be mounted with i_version flag
1721 */
1722
1723static inline void inode_inc_iversion(struct inode *inode)
1724{
1725 spin_lock(&inode->i_lock);
1726 inode->i_version++;
1727 spin_unlock(&inode->i_lock);
1728}
1729
Christoph Hellwig869243a2006-01-09 20:52:03 -08001730extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731static inline void file_accessed(struct file *file)
1732{
1733 if (!(file->f_flags & O_NOATIME))
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001734 touch_atime(file->f_path.mnt, file->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735}
1736
1737int sync_inode(struct inode *inode, struct writeback_control *wbc);
1738
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739struct file_system_type {
1740 const char *name;
1741 int fs_flags;
David Howells454e2392006-06-23 02:02:57 -07001742 int (*get_sb) (struct file_system_type *, int,
1743 const char *, void *, struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 void (*kill_sb) (struct super_block *);
1745 struct module *owner;
1746 struct file_system_type * next;
1747 struct list_head fs_supers;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001748
Ingo Molnarcf516242006-07-03 00:25:27 -07001749 struct lock_class_key s_lock_key;
Arjan van de Ven897c6ff2006-07-03 00:25:28 -07001750 struct lock_class_key s_umount_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001751
1752 struct lock_class_key i_lock_key;
1753 struct lock_class_key i_mutex_key;
Peter Zijlstra14358e62007-10-14 01:38:33 +02001754 struct lock_class_key i_mutex_dir_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001755 struct lock_class_key i_alloc_sem_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756};
1757
Serge E. Hallyn909e6d92009-04-06 19:01:07 -07001758extern int get_sb_ns(struct file_system_type *fs_type, int flags, void *data,
1759 int (*fill_super)(struct super_block *, void *, int),
1760 struct vfsmount *mnt);
David Howells454e2392006-06-23 02:02:57 -07001761extern int get_sb_bdev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762 int flags, const char *dev_name, void *data,
David Howells454e2392006-06-23 02:02:57 -07001763 int (*fill_super)(struct super_block *, void *, int),
1764 struct vfsmount *mnt);
1765extern int get_sb_single(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001767 int (*fill_super)(struct super_block *, void *, int),
1768 struct vfsmount *mnt);
1769extern int get_sb_nodev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001771 int (*fill_super)(struct super_block *, void *, int),
1772 struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773void generic_shutdown_super(struct super_block *sb);
1774void kill_block_super(struct super_block *sb);
1775void kill_anon_super(struct super_block *sb);
1776void kill_litter_super(struct super_block *sb);
1777void deactivate_super(struct super_block *sb);
Al Viro74dbbdd2009-05-06 01:07:50 -04001778void deactivate_locked_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779int set_anon_super(struct super_block *s, void *data);
1780struct super_block *sget(struct file_system_type *type,
1781 int (*test)(struct super_block *,void *),
1782 int (*set)(struct super_block *,void *),
1783 void *data);
David Howells454e2392006-06-23 02:02:57 -07001784extern int get_sb_pseudo(struct file_system_type *, char *,
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001785 const struct super_operations *ops, unsigned long,
David Howells454e2392006-06-23 02:02:57 -07001786 struct vfsmount *mnt);
Sukadev Bhattiprolua3ec9472009-03-04 12:06:34 -08001787extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788int __put_super_and_need_restart(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789
1790/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1791#define fops_get(fops) \
1792 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1793#define fops_put(fops) \
1794 do { if (fops) module_put((fops)->owner); } while(0)
1795
1796extern int register_filesystem(struct file_system_type *);
1797extern int unregister_filesystem(struct file_system_type *);
Pavel Emelyanov8bf97252007-10-18 23:40:02 -07001798extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1799#define kern_mount(type) kern_mount_data(type, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800extern int may_umount_tree(struct vfsmount *);
1801extern int may_umount(struct vfsmount *);
1802extern long do_mount(char *, char *, char *, unsigned long, void *);
Al Viro8aec0802007-06-07 12:20:32 -04001803extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *);
1804extern void drop_collected_mounts(struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805
David Howells726c3342006-06-23 02:02:58 -07001806extern int vfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807
Al Viroce3b0f82009-03-29 19:08:22 -04001808extern int current_umask(void);
1809
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001810/* /sys/fs */
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001811extern struct kobject *fs_kobj;
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001812
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001813extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1814
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815#define FLOCK_VERIFY_READ 1
1816#define FLOCK_VERIFY_WRITE 2
1817
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001818#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819extern int locks_mandatory_locked(struct inode *);
1820extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1821
1822/*
1823 * Candidates for mandatory locking have the setgid bit set
1824 * but no group execute bit - an otherwise meaningless combination.
1825 */
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001826
1827static inline int __mandatory_lock(struct inode *ino)
1828{
1829 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1830}
1831
1832/*
1833 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1834 * otherwise these will be advisory locks
1835 */
1836
1837static inline int mandatory_lock(struct inode *ino)
1838{
1839 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1840}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
1842static inline int locks_verify_locked(struct inode *inode)
1843{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001844 if (mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845 return locks_mandatory_locked(inode);
1846 return 0;
1847}
1848
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849static inline int locks_verify_truncate(struct inode *inode,
1850 struct file *filp,
1851 loff_t size)
1852{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001853 if (inode->i_flock && mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 return locks_mandatory_area(
1855 FLOCK_VERIFY_WRITE, inode, filp,
1856 size < inode->i_size ? size : inode->i_size,
1857 (size < inode->i_size ? inode->i_size - size
1858 : size - inode->i_size)
1859 );
1860 return 0;
1861}
1862
1863static inline int break_lease(struct inode *inode, unsigned int mode)
1864{
1865 if (inode->i_flock)
1866 return __break_lease(inode, mode);
1867 return 0;
1868}
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001869#else /* !CONFIG_FILE_LOCKING */
Steven Whitehouseaf5df562009-01-20 10:29:46 +00001870static inline int locks_mandatory_locked(struct inode *inode)
1871{
1872 return 0;
1873}
1874
1875static inline int locks_mandatory_area(int rw, struct inode *inode,
1876 struct file *filp, loff_t offset,
1877 size_t count)
1878{
1879 return 0;
1880}
1881
1882static inline int __mandatory_lock(struct inode *inode)
1883{
1884 return 0;
1885}
1886
1887static inline int mandatory_lock(struct inode *inode)
1888{
1889 return 0;
1890}
1891
1892static inline int locks_verify_locked(struct inode *inode)
1893{
1894 return 0;
1895}
1896
1897static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
1898 size_t size)
1899{
1900 return 0;
1901}
1902
1903static inline int break_lease(struct inode *inode, unsigned int mode)
1904{
1905 return 0;
1906}
1907
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001908#endif /* CONFIG_FILE_LOCKING */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909
1910/* fs/open.c */
1911
NeilBrown4a301312006-01-08 01:02:39 -08001912extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1913 struct file *filp);
Jason Uhlenkott8e8a1402007-10-20 03:16:18 +02001914extern long do_sys_open(int dfd, const char __user *filename, int flags,
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001915 int mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916extern struct file *filp_open(const char *, int, int);
David Howells745ca242008-11-14 10:39:22 +11001917extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
1918 const struct cred *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919extern int filp_close(struct file *, fl_owner_t id);
1920extern char * getname(const char __user *);
1921
1922/* fs/dcache.c */
1923extern void __init vfs_caches_init_early(void);
1924extern void __init vfs_caches_init(unsigned long);
1925
Christoph Lameterb86c0892006-12-06 20:32:57 -08001926extern struct kmem_cache *names_cachep;
1927
Christoph Lametere94b1762006-12-06 20:33:17 -08001928#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1930#ifndef CONFIG_AUDITSYSCALL
1931#define putname(name) __putname(name)
1932#else
1933extern void putname(const char *name);
1934#endif
1935
David Howells93614012006-09-30 20:45:40 +02001936#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937extern int register_blkdev(unsigned int, const char *);
Akinobu Mitaf4480242007-07-17 04:03:47 -07001938extern void unregister_blkdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939extern struct block_device *bdget(dev_t);
1940extern void bd_set_size(struct block_device *, loff_t size);
1941extern void bd_forget(struct inode *inode);
1942extern void bdput(struct block_device *);
Al Viroaeb5d722008-09-02 15:28:45 -04001943extern struct block_device *open_by_devnum(dev_t, fmode_t);
Nick Piggin585d3bc2009-02-25 10:44:19 +01001944extern void invalidate_bdev(struct block_device *);
1945extern int sync_blockdev(struct block_device *bdev);
1946extern struct super_block *freeze_bdev(struct block_device *);
Eric Sandeenc2d75432009-03-31 15:23:46 -07001947extern void emergency_thaw_all(void);
Nick Piggin585d3bc2009-02-25 10:44:19 +01001948extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
1949extern int fsync_bdev(struct block_device *);
1950extern int fsync_super(struct super_block *);
1951extern int fsync_no_super(struct block_device *);
David Howells93614012006-09-30 20:45:40 +02001952#else
1953static inline void bd_forget(struct inode *inode) {}
Al Viro47e44912009-04-01 07:07:16 -04001954static inline int sync_blockdev(struct block_device *bdev) { return 0; }
1955static inline void invalidate_bdev(struct block_device *bdev) {}
1956
1957static inline struct super_block *freeze_bdev(struct block_device *sb)
1958{
1959 return NULL;
1960}
1961
1962static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
1963{
1964 return 0;
1965}
David Howells93614012006-09-30 20:45:40 +02001966#endif
1967extern const struct file_operations def_blk_fops;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001968extern const struct file_operations def_chr_fops;
1969extern const struct file_operations bad_sock_fops;
1970extern const struct file_operations def_fifo_fops;
David Howells93614012006-09-30 20:45:40 +02001971#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
Al Viro56b26ad2008-09-19 03:17:36 -04001973extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
Al Viro572c4892007-10-08 13:24:05 -04001975extern int blkdev_get(struct block_device *, fmode_t);
Al Viro9a1c3542008-02-22 20:40:24 -05001976extern int blkdev_put(struct block_device *, fmode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977extern int bd_claim(struct block_device *, void *);
1978extern void bd_release(struct block_device *);
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08001979#ifdef CONFIG_SYSFS
1980extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1981extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1982#else
1983#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1984#define bd_release_from_disk(bdev, disk) bd_release(bdev)
1985#endif
David Howells93614012006-09-30 20:45:40 +02001986#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987
1988/* fs/char_dev.c */
Joe Korty68eef3b2006-03-31 02:30:32 -08001989#define CHRDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1991extern int register_chrdev_region(dev_t, unsigned, const char *);
1992extern int register_chrdev(unsigned int, const char *,
Arjan van de Ven99ac48f2006-03-28 01:56:41 -08001993 const struct file_operations *);
Akinobu Mitae53252d2007-07-19 01:47:51 -07001994extern void unregister_chrdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995extern void unregister_chrdev_region(dev_t, unsigned);
Joe Korty68eef3b2006-03-31 02:30:32 -08001996extern void chrdev_show(struct seq_file *,off_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997
1998/* fs/block_dev.c */
1999#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
Tejun Heo1f014292008-08-25 19:47:23 +09002000#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
David Howells93614012006-09-30 20:45:40 +02002001
2002#ifdef CONFIG_BLOCK
2003#define BLKDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004extern const char *__bdevname(dev_t, char *buffer);
2005extern const char *bdevname(struct block_device *bdev, char *buffer);
2006extern struct block_device *lookup_bdev(const char *);
Al Viro30c40d22008-02-22 19:50:45 -05002007extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
2008extern void close_bdev_exclusive(struct block_device *, fmode_t);
Joe Korty68eef3b2006-03-31 02:30:32 -08002009extern void blkdev_show(struct seq_file *,off_t);
Al Viro30c40d22008-02-22 19:50:45 -05002010
David Howells93614012006-09-30 20:45:40 +02002011#else
2012#define BLKDEV_MAJOR_HASH_SIZE 0
2013#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014
2015extern void init_special_inode(struct inode *, umode_t, dev_t);
2016
2017/* Invalid inode operations -- fs/bad_inode.c */
2018extern void make_bad_inode(struct inode *);
2019extern int is_bad_inode(struct inode *);
2020
Denys Vlasenkod2d96482008-07-01 14:16:09 +02002021extern const struct file_operations read_pipefifo_fops;
2022extern const struct file_operations write_pipefifo_fops;
2023extern const struct file_operations rdwr_pipefifo_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024
2025extern int fs_may_remount_ro(struct super_block *);
2026
David Howells93614012006-09-30 20:45:40 +02002027#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028/*
2029 * return READ, READA, or WRITE
2030 */
2031#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2032
2033/*
2034 * return data direction, READ or WRITE
2035 */
2036#define bio_data_dir(bio) ((bio)->bi_rw & 1)
2037
Andrew Pattersonc3279d12008-09-04 14:27:25 -06002038extern void check_disk_size_change(struct gendisk *disk,
2039 struct block_device *bdev);
Andrew Patterson0c002c22008-09-04 14:27:20 -06002040extern int revalidate_disk(struct gendisk *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041extern int check_disk_change(struct block_device *);
Christoph Hellwig2ef41632005-05-05 16:15:59 -07002042extern int __invalidate_device(struct block_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043extern int invalidate_partition(struct gendisk *, int);
David Howells93614012006-09-30 20:45:40 +02002044#endif
2045extern int invalidate_inodes(struct super_block *);
Andrew Mortonfc9a07e2007-07-15 23:38:14 -07002046unsigned long __invalidate_mapping_pages(struct address_space *mapping,
2047 pgoff_t start, pgoff_t end,
2048 bool be_atomic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049unsigned long invalidate_mapping_pages(struct address_space *mapping,
2050 pgoff_t start, pgoff_t end);
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08002051
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08002052static inline unsigned long __deprecated
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08002053invalidate_inode_pages(struct address_space *mapping)
2054{
2055 return invalidate_mapping_pages(mapping, 0, ~0UL);
2056}
2057
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058static inline void invalidate_remote_inode(struct inode *inode)
2059{
2060 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2061 S_ISLNK(inode->i_mode))
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08002062 invalidate_mapping_pages(inode->i_mapping, 0, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063}
2064extern int invalidate_inode_pages2(struct address_space *mapping);
2065extern int invalidate_inode_pages2_range(struct address_space *mapping,
2066 pgoff_t start, pgoff_t end);
Artem Bityutskiy4ee6afd2008-05-07 21:01:30 +03002067extern void generic_sync_sb_inodes(struct super_block *sb,
2068 struct writeback_control *wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069extern int write_inode_now(struct inode *, int);
2070extern int filemap_fdatawrite(struct address_space *);
2071extern int filemap_flush(struct address_space *);
2072extern int filemap_fdatawait(struct address_space *);
2073extern int filemap_write_and_wait(struct address_space *mapping);
2074extern int filemap_write_and_wait_range(struct address_space *mapping,
2075 loff_t lstart, loff_t lend);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08002076extern int wait_on_page_writeback_range(struct address_space *mapping,
2077 pgoff_t start, pgoff_t end);
2078extern int __filemap_fdatawrite_range(struct address_space *mapping,
2079 loff_t start, loff_t end, int sync_mode);
Jan Karaf4c0a0f2008-07-11 19:27:31 -04002080extern int filemap_fdatawrite_range(struct address_space *mapping,
2081 loff_t start, loff_t end);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08002082
Christoph Hellwig4c728ef2008-12-22 21:11:15 +01002083extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084extern void sync_supers(void);
2085extern void sync_filesystems(int wait);
David Howellscf9a2ae2006-08-29 19:05:54 +01002086extern void __fsync_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087extern void emergency_sync(void);
2088extern void emergency_remount(void);
2089extern int do_remount_sb(struct super_block *sb, int flags,
2090 void *data, int force);
David Howells93614012006-09-30 20:45:40 +02002091#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092extern sector_t bmap(struct inode *, sector_t);
David Howells93614012006-09-30 20:45:40 +02002093#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094extern int notify_change(struct dentry *, struct iattr *);
Al Virof419a2e2008-07-22 00:07:17 -04002095extern int inode_permission(struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096extern int generic_permission(struct inode *, int,
2097 int (*check_acl)(struct inode *, int));
2098
Miklos Szeredif696a362008-07-31 13:41:58 +02002099static inline bool execute_ok(struct inode *inode)
2100{
2101 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2102}
2103
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104extern int get_write_access(struct inode *);
2105extern int deny_write_access(struct file *);
2106static inline void put_write_access(struct inode * inode)
2107{
2108 atomic_dec(&inode->i_writecount);
2109}
2110static inline void allow_write_access(struct file *file)
2111{
2112 if (file)
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08002113 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114}
Ulrich Dreppered8cae82008-07-23 21:29:30 -07002115extern int do_pipe_flags(int *, int);
Ulrich Drepperbe61a862008-07-23 21:29:40 -07002116extern struct file *create_read_pipe(struct file *f, int flags);
2117extern struct file *create_write_pipe(int flags);
Andi Kleend6cbd282006-09-30 23:29:26 -07002118extern void free_write_pipe(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119
Christoph Hellwiga70e65d2008-02-15 14:37:28 -08002120extern struct file *do_filp_open(int dfd, const char *pathname,
Al Viro6e8341a2009-04-06 11:16:22 -04002121 int open_flag, int mode, int acc_mode);
Christoph Hellwig3fb64192008-10-24 09:58:10 +02002122extern int may_open(struct path *, int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123
2124extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
2125extern struct file * open_exec(const char *);
2126
2127/* fs/dcache.c -- generic fs support functions */
2128extern int is_subdir(struct dentry *, struct dentry *);
2129extern ino_t find_inode_number(struct dentry *, struct qstr *);
2130
2131#include <linux/err.h>
2132
2133/* needed for stackable file system support */
2134extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
2135
2136extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
2137
David Chinner2cb15992008-10-30 17:32:23 +11002138extern struct inode * inode_init_always(struct super_block *, struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139extern void inode_init_once(struct inode *);
David Chinner8290c352008-10-30 17:35:24 +11002140extern void inode_add_to_lists(struct super_block *, struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141extern void iput(struct inode *);
2142extern struct inode * igrab(struct inode *);
2143extern ino_t iunique(struct super_block *, ino_t);
2144extern int inode_needs_sync(struct inode *inode);
2145extern void generic_delete_inode(struct inode *inode);
Mark Fashehcb2c0232005-07-07 17:56:03 -07002146extern void generic_drop_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147
Anton Altaparmakov88bd5122005-07-13 01:10:44 -07002148extern struct inode *ilookup5_nowait(struct super_block *sb,
2149 unsigned long hashval, int (*test)(struct inode *, void *),
2150 void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002151extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
2152 int (*test)(struct inode *, void *), void *data);
2153extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
2154
2155extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
2156extern struct inode * iget_locked(struct super_block *, unsigned long);
Al Viro261bca82008-12-30 01:48:21 -05002157extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
2158extern int insert_inode_locked(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159extern void unlock_new_inode(struct inode *);
2160
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161extern void __iget(struct inode * inode);
David Howellsb46980f2008-02-07 00:15:27 -08002162extern void iget_failed(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163extern void clear_inode(struct inode *);
2164extern void destroy_inode(struct inode *);
2165extern struct inode *new_inode(struct super_block *);
Jens Axboe01de85e2006-10-17 19:50:36 +02002166extern int should_remove_suid(struct dentry *);
Miklos Szeredi2f1936b2008-06-24 16:50:14 +02002167extern int file_remove_suid(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168
2169extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2170extern void remove_inode_hash(struct inode *);
2171static inline void insert_inode_hash(struct inode *inode) {
2172 __insert_inode_hash(inode, inode->i_ino);
2173}
2174
2175extern struct file * get_empty_filp(void);
2176extern void file_move(struct file *f, struct list_head *list);
2177extern void file_kill(struct file *f);
David Howells93614012006-09-30 20:45:40 +02002178#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179struct bio;
2180extern void submit_bio(int, struct bio *);
2181extern int bdev_read_only(struct block_device *);
David Howells93614012006-09-30 20:45:40 +02002182#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183extern int set_blocksize(struct block_device *, int);
2184extern int sb_set_blocksize(struct super_block *, int);
2185extern int sb_min_blocksize(struct super_block *, int);
Fengguang Wu08d8e972007-10-16 23:30:39 -07002186extern int sb_has_dirty_inodes(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187
2188extern int generic_file_mmap(struct file *, struct vm_area_struct *);
2189extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2190extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
Badari Pulavarty027445c2006-09-30 23:28:46 -07002192extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Badari Pulavarty027445c2006-09-30 23:28:46 -07002193extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
Badari Pulavarty027445c2006-09-30 23:28:46 -07002195 unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
2197 unsigned long *, loff_t, loff_t *, size_t, size_t);
2198extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
2199 unsigned long, loff_t, loff_t *, size_t, ssize_t);
2200extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
2201extern 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 -07002202extern int generic_segment_checks(const struct iovec *iov,
2203 unsigned long *nr_segs, size_t *count, int access_flags);
Andrew Morton88e6fae2006-04-11 13:59:36 +02002204
2205/* fs/splice.c */
Jens Axboecbb7e572006-04-11 14:57:50 +02002206extern ssize_t generic_file_splice_read(struct file *, loff_t *,
Andrew Morton88e6fae2006-04-11 13:59:36 +02002207 struct pipe_inode_info *, size_t, unsigned int);
2208extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
Jens Axboecbb7e572006-04-11 14:57:50 +02002209 struct file *, loff_t *, size_t, unsigned int);
Andrew Morton88e6fae2006-04-11 13:59:36 +02002210extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
Jens Axboecbb7e572006-04-11 14:57:50 +02002211 struct file *out, loff_t *, size_t len, unsigned int flags);
2212extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
Andrew Morton88e6fae2006-04-11 13:59:36 +02002213 size_t len, unsigned int flags);
2214
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215extern void
2216file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
2218extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
Andi Kleen9465efc2008-06-27 11:05:24 +02002219extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
2220 int origin);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221extern int generic_file_open(struct inode * inode, struct file * filp);
2222extern int nonseekable_open(struct inode * inode, struct file * filp);
2223
Carsten Otteceffc072005-06-23 22:05:25 -07002224#ifdef CONFIG_FS_XIP
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07002225extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
2226 loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07002227extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07002228extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
2229 size_t len, loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07002230extern int xip_truncate_page(struct address_space *mapping, loff_t from);
Carsten Otte6d791252005-06-23 22:05:26 -07002231#else
2232static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
2233{
2234 return 0;
2235}
Carsten Otteceffc072005-06-23 22:05:25 -07002236#endif
2237
David Howells93614012006-09-30 20:45:40 +02002238#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
2240 struct block_device *bdev, const struct iovec *iov, loff_t offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002241 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 int lock_type);
2243
2244enum {
2245 DIO_LOCKING = 1, /* need locking between buffered and direct access */
2246 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
2247 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
2248};
2249
2250static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2251 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002252 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253 dio_iodone_t end_io)
2254{
2255 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002256 nr_segs, get_block, end_io, DIO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257}
2258
2259static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
2260 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002261 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 dio_iodone_t end_io)
2263{
2264 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002265 nr_segs, get_block, end_io, DIO_NO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266}
2267
2268static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
2269 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002270 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 dio_iodone_t end_io)
2272{
2273 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002274 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275}
David Howells93614012006-09-30 20:45:40 +02002276#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002277
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002278extern const struct file_operations generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279
2280#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2281
2282extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2283extern int vfs_follow_link(struct nameidata *, const char *);
2284extern int page_readlink(struct dentry *, char __user *, int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07002285extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2286extern void page_put_link(struct dentry *, struct nameidata *, void *);
Kirill Korotaev0adb25d2006-03-11 03:27:13 -08002287extern int __page_symlink(struct inode *inode, const char *symname, int len,
Nick Piggin54566b22009-01-04 12:00:53 -08002288 int nofs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289extern int page_symlink(struct inode *inode, const char *symname, int len);
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002290extern const struct inode_operations page_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291extern int generic_readlink(struct dentry *, char __user *, int);
2292extern void generic_fillattr(struct inode *, struct kstat *);
2293extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2294void inode_add_bytes(struct inode *inode, loff_t bytes);
2295void inode_sub_bytes(struct inode *inode, loff_t bytes);
2296loff_t inode_get_bytes(struct inode *inode);
2297void inode_set_bytes(struct inode *inode, loff_t bytes);
2298
2299extern int vfs_readdir(struct file *, filldir_t, void *);
2300
2301extern int vfs_stat(char __user *, struct kstat *);
2302extern int vfs_lstat(char __user *, struct kstat *);
2303extern int vfs_fstat(unsigned int, struct kstat *);
Oleg Drokin0112fc22009-04-08 20:05:42 +04002304extern int vfs_fstatat(int , char __user *, struct kstat *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305
Erez Zadokdeb21db2008-02-07 00:13:25 -08002306extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2307 unsigned long arg);
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002308extern int __generic_block_fiemap(struct inode *inode,
2309 struct fiemap_extent_info *fieinfo, u64 start,
2310 u64 len, get_block_t *get_block);
Josef Bacik68c9d702008-10-03 17:32:43 -04002311extern int generic_block_fiemap(struct inode *inode,
2312 struct fiemap_extent_info *fieinfo, u64 start,
2313 u64 len, get_block_t *get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314
Miklos Szeredic18479f2007-10-18 23:39:11 -07002315extern void get_filesystem(struct file_system_type *fs);
2316extern void put_filesystem(struct file_system_type *fs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317extern struct file_system_type *get_fs_type(const char *name);
2318extern struct super_block *get_super(struct block_device *);
2319extern struct super_block *user_get_super(dev_t);
2320extern void drop_super(struct super_block *sb);
2321
2322extern int dcache_dir_open(struct inode *, struct file *);
2323extern int dcache_dir_close(struct inode *, struct file *);
2324extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2325extern int dcache_readdir(struct file *, void *, filldir_t);
2326extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells726c3342006-06-23 02:02:58 -07002327extern int simple_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2329extern int simple_unlink(struct inode *, struct dentry *);
2330extern int simple_rmdir(struct inode *, struct dentry *);
2331extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2332extern int simple_sync_file(struct file *, struct dentry *, int);
2333extern int simple_empty(struct dentry *);
2334extern int simple_readpage(struct file *file, struct page *page);
2335extern int simple_prepare_write(struct file *file, struct page *page,
2336 unsigned offset, unsigned to);
Nick Pigginafddba42007-10-16 01:25:01 -07002337extern int simple_write_begin(struct file *file, struct address_space *mapping,
2338 loff_t pos, unsigned len, unsigned flags,
2339 struct page **pagep, void **fsdata);
2340extern int simple_write_end(struct file *file, struct address_space *mapping,
2341 loff_t pos, unsigned len, unsigned copied,
2342 struct page *page, void *fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343
2344extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
2345extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002346extern const struct file_operations simple_dir_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002347extern const struct inode_operations simple_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002348struct tree_descr { char *name; const struct file_operations *ops; int mode; };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349struct dentry *d_alloc_name(struct dentry *, const char *);
2350extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -04002351extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352extern void simple_release_fs(struct vfsmount **mount, int *count);
2353
Akinobu Mita93b07112008-06-05 22:46:21 -07002354extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2355 loff_t *ppos, const void *from, size_t available);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356
Christoph Lametere965f962006-02-01 03:05:41 -08002357#ifdef CONFIG_MIGRATION
Christoph Lameter2d1db3b2006-06-23 02:03:33 -07002358extern int buffer_migrate_page(struct address_space *,
2359 struct page *, struct page *);
Christoph Lametere965f962006-02-01 03:05:41 -08002360#else
2361#define buffer_migrate_page NULL
2362#endif
2363
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364extern int inode_change_ok(struct inode *, struct iattr *);
2365extern int __must_check inode_setattr(struct inode *, struct iattr *);
2366
Christoph Hellwig870f4812006-01-09 20:52:01 -08002367extern void file_update_time(struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368
Miklos Szeredib3b304a2008-02-08 04:21:35 -08002369extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2370extern void save_mount_options(struct super_block *sb, char *options);
Al Viro2a32ceb2009-05-08 16:05:57 -04002371extern void replace_mount_options(struct super_block *sb, char *options);
Miklos Szeredib3b304a2008-02-08 04:21:35 -08002372
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373static inline ino_t parent_ino(struct dentry *dentry)
2374{
2375 ino_t res;
2376
2377 spin_lock(&dentry->d_lock);
2378 res = dentry->d_parent->d_inode->i_ino;
2379 spin_unlock(&dentry->d_lock);
2380 return res;
2381}
2382
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383/* Transaction based IO helpers */
2384
2385/*
2386 * An argresp is stored in an allocated page and holds the
2387 * size of the argument or response, along with its content
2388 */
2389struct simple_transaction_argresp {
2390 ssize_t size;
2391 char data[0];
2392};
2393
2394#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2395
2396char *simple_transaction_get(struct file *file, const char __user *buf,
2397 size_t size);
2398ssize_t simple_transaction_read(struct file *file, char __user *buf,
2399 size_t size, loff_t *pos);
2400int simple_transaction_release(struct inode *inode, struct file *file);
2401
Ingo Molnar76791ab2009-03-25 16:48:35 +01002402void simple_transaction_set(struct file *file, size_t n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002404/*
2405 * simple attribute files
2406 *
2407 * These attributes behave similar to those in sysfs:
2408 *
2409 * Writing to an attribute immediately sets a value, an open file can be
2410 * written to multiple times.
2411 *
2412 * Reading from an attribute creates a buffer from the value that might get
2413 * read with multiple read calls. When the attribute has been read
2414 * completely, no further read calls are possible until the file is opened
2415 * again.
2416 *
2417 * All attributes contain a text representation of a numeric value
2418 * that are accessed with the get() and set() functions.
2419 */
2420#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2421static int __fops ## _open(struct inode *inode, struct file *file) \
2422{ \
2423 __simple_attr_check_format(__fmt, 0ull); \
2424 return simple_attr_open(inode, file, __get, __set, __fmt); \
2425} \
2426static struct file_operations __fops = { \
2427 .owner = THIS_MODULE, \
2428 .open = __fops ## _open, \
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002429 .release = simple_attr_release, \
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002430 .read = simple_attr_read, \
2431 .write = simple_attr_write, \
2432};
2433
2434static inline void __attribute__((format(printf, 1, 2)))
2435__simple_attr_check_format(const char *fmt, ...)
2436{
2437 /* don't do anything, just let the compiler check the arguments; */
2438}
2439
2440int simple_attr_open(struct inode *inode, struct file *file,
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002441 int (*get)(void *, u64 *), int (*set)(void *, u64),
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002442 const char *fmt);
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002443int simple_attr_release(struct inode *inode, struct file *file);
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002444ssize_t simple_attr_read(struct file *file, char __user *buf,
2445 size_t len, loff_t *ppos);
2446ssize_t simple_attr_write(struct file *file, const char __user *buf,
2447 size_t len, loff_t *ppos);
2448
Alexey Dobriyan4be28542007-10-16 23:26:21 -07002449struct ctl_table;
2450int proc_nr_files(struct ctl_table *table, int write, struct file *filp,
Adrian Bunk62239ac2007-07-17 04:03:45 -07002451 void __user *buffer, size_t *lenp, loff_t *ppos);
2452
Tetsuo Handa38e23c92009-04-09 20:17:52 +09002453int __init get_filesystem_list(char *buf);
Adrian Bunk62239ac2007-07-17 04:03:45 -07002454
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455#endif /* __KERNEL__ */
2456#endif /* _LINUX_FS_H */