blob: 92734c0012e679cb3326ba25be08f52dce81fbc8 [file] [log] [blame]
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#define RW_MASK 1
91#define RWA_MASK 2
92#define READ 0
93#define WRITE 1
94#define READA 2 /* read-ahead - don't block if no resources */
Jan Karaa7662232005-09-06 15:19:10 -070095#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
Jens Axboe93dbb392009-02-16 10:25:40 +010096#define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
Jens Axboe5404bc72006-08-10 09:01:02 +020097#define READ_META (READ | (1 << BIO_RW_META))
Jens Axboe93dbb392009-02-16 10:25:40 +010098#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
99#define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
David Woodhousefb2dce82008-08-05 18:01:53 +0100100#define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
David Woodhousee17fc0a2008-08-09 16:42:20 +0100101#define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
102#define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104#define SEL_IN 1
105#define SEL_OUT 2
106#define SEL_EX 4
107
108/* public flags for file_system_type */
109#define FS_REQUIRES_DEV 1
110#define FS_BINARY_MOUNTDATA 2
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -0700111#define FS_HAS_SUBTYPE 4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
Mark Fasheh349457c2006-09-08 14:22:21 -0700113#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
114 * during rename() internally.
115 */
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117/*
118 * These are the fs-independent mount-flags: up to 32 flags are supported
119 */
120#define MS_RDONLY 1 /* Mount read-only */
121#define MS_NOSUID 2 /* Ignore suid and sgid bits */
122#define MS_NODEV 4 /* Disallow access to device special files */
123#define MS_NOEXEC 8 /* Disallow program execution */
124#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
125#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
126#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
127#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
128#define MS_NOATIME 1024 /* Do not update access times. */
129#define MS_NODIRATIME 2048 /* Do not update directory access times */
130#define MS_BIND 4096
131#define MS_MOVE 8192
132#define MS_REC 16384
Theodore Ts'o9b04c992006-03-24 03:15:10 -0800133#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
134 MS_VERBOSE is deprecated. */
135#define MS_SILENT 32768
Miklos Szeredibf066c72006-01-08 01:03:19 -0800136#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
Ram Pai9676f0c2005-11-07 17:21:20 -0500137#define MS_UNBINDABLE (1<<17) /* change to unbindable */
Ram Pai07b20882005-11-07 17:19:07 -0500138#define MS_PRIVATE (1<<18) /* change to private */
Ram Paia58b0eb2005-11-07 17:20:48 -0500139#define MS_SLAVE (1<<19) /* change to slave */
Ram Pai03e06e62005-11-07 17:19:33 -0500140#define MS_SHARED (1<<20) /* change to shared */
Valerie Henson47ae32d2006-12-13 00:34:34 -0800141#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
Pavel Emelyanov8bf97252007-10-18 23:40:02 -0700142#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500143#define MS_I_VERSION (1<<23) /* Update inode I_version field */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144#define MS_ACTIVE (1<<30)
145#define MS_NOUSER (1<<31)
146
147/*
148 * Superblock flags that can be altered by MS_REMOUNT
149 */
Mimi Zohar08b9fe62008-10-13 00:09:50 -0400150#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152/*
153 * Old magic mount flag and mask
154 */
155#define MS_MGC_VAL 0xC0ED0000
156#define MS_MGC_MSK 0xffff0000
157
158/* Inode flags - they have nothing to superblock flags now */
159
160#define S_SYNC 1 /* Writes are synced at once */
161#define S_NOATIME 2 /* Do not update access times */
162#define S_APPEND 4 /* Append-only file */
163#define S_IMMUTABLE 8 /* Immutable file */
164#define S_DEAD 16 /* removed, but still open directory */
165#define S_NOQUOTA 32 /* Inode is not counted to quota */
166#define S_DIRSYNC 64 /* Directory modifications are synchronous */
167#define S_NOCMTIME 128 /* Do not update file c/mtime */
168#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
169#define S_PRIVATE 512 /* Inode is fs-internal */
170
171/*
172 * Note that nosuid etc flags are inode-specific: setting some file-system
173 * flags just means all the inodes inherit those flags by default. It might be
174 * possible to override it selectively if you really wanted to with some
175 * ioctl() that is not currently implemented.
176 *
177 * Exception: MS_RDONLY is always applied to the entire file system.
178 *
179 * Unfortunately, it is possible to change a filesystems flags with it mounted
180 * with files in use. This means that all of the inodes will not have their
181 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
182 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
183 */
184#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
185
186#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
187#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
188 ((inode)->i_flags & S_SYNC))
189#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
190 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
191#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
Eric Dumazet37756ce2007-02-10 01:44:49 -0800192#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500193#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
196#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
197#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
199
200#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
201#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
202#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
203#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
204
205/* the read-only stuff doesn't really belong here, but any other place is
206 probably as bad and I don't want to create yet another include file. */
207
208#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
209#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
210#define BLKRRPART _IO(0x12,95) /* re-read partition table */
211#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
212#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
213#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
214#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
215#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
216#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
217#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
218#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
219#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
220#if 0
221#define BLKPG _IO(0x12,105)/* See blkpg.h */
222
223/* Some people are morons. Do not use sizeof! */
224
225#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
226#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
227/* This was here just to show that the number is taken -
228 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
229#endif
230/* A jump here: 108-111 have been used for various private purposes. */
231#define BLKBSZGET _IOR(0x12,112,size_t)
232#define BLKBSZSET _IOW(0x12,113,size_t)
233#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
Jens Axboe2056a782006-03-23 20:00:26 +0100234#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
235#define BLKTRACESTART _IO(0x12,116)
236#define BLKTRACESTOP _IO(0x12,117)
237#define BLKTRACETEARDOWN _IO(0x12,118)
David Woodhoused30a2602008-08-11 15:58:42 +0100238#define BLKDISCARD _IO(0x12,119)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
241#define FIBMAP _IO(0x00,1) /* bmap access */
242#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
Takashi Satofcccf502009-01-09 16:40:59 -0800243#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
244#define FITHAW _IOWR('X', 120, int) /* Thaw */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
David Howells36695672006-08-29 19:06:16 +0100246#define FS_IOC_GETFLAGS _IOR('f', 1, long)
247#define FS_IOC_SETFLAGS _IOW('f', 2, long)
248#define FS_IOC_GETVERSION _IOR('v', 1, long)
249#define FS_IOC_SETVERSION _IOW('v', 2, long)
Mark Fashehc4b929b2008-10-08 19:44:18 -0400250#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
David Howells36695672006-08-29 19:06:16 +0100251#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
252#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
253#define FS_IOC32_GETVERSION _IOR('v', 1, int)
254#define FS_IOC32_SETVERSION _IOW('v', 2, int)
255
256/*
257 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
258 */
259#define FS_SECRM_FL 0x00000001 /* Secure deletion */
260#define FS_UNRM_FL 0x00000002 /* Undelete */
261#define FS_COMPR_FL 0x00000004 /* Compress file */
262#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
263#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
264#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
265#define FS_NODUMP_FL 0x00000040 /* do not dump file */
266#define FS_NOATIME_FL 0x00000080 /* do not update atime */
267/* Reserved for compression usage... */
268#define FS_DIRTY_FL 0x00000100
269#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
270#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
271#define FS_ECOMPR_FL 0x00000800 /* Compression error */
272/* End compression flags --- maybe not all used */
273#define FS_BTREE_FL 0x00001000 /* btree format dir */
274#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
275#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
276#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
277#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
278#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
279#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400280#define FS_EXTENT_FL 0x00080000 /* Extents */
281#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
David Howells36695672006-08-29 19:06:16 +0100282#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
283
284#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
285#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
286
287
Andrew Mortone46e4902006-05-22 22:35:24 -0700288#define SYNC_FILE_RANGE_WAIT_BEFORE 1
289#define SYNC_FILE_RANGE_WRITE 2
290#define SYNC_FILE_RANGE_WAIT_AFTER 4
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292#ifdef __KERNEL__
293
294#include <linux/linkage.h>
295#include <linux/wait.h>
296#include <linux/types.h>
297#include <linux/kdev_t.h>
298#include <linux/dcache.h>
Al Viro3f8206d2008-07-26 03:46:43 -0400299#include <linux/path.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300#include <linux/stat.h>
301#include <linux/cache.h>
302#include <linux/kobject.h>
303#include <linux/list.h>
304#include <linux/radix-tree.h>
305#include <linux/prio_tree.h>
306#include <linux/init.h>
Al Viro914e2632006-10-18 13:55:46 -0400307#include <linux/pid.h>
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800308#include <linux/mutex.h>
Satyam Sharma3bd858a2007-07-17 15:00:08 +0530309#include <linux/capability.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -0400310#include <linux/semaphore.h>
Mark Fashehc4b929b2008-10-08 19:44:18 -0400311#include <linux/fiemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313#include <asm/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314#include <asm/byteorder.h>
315
Christoph Hellwiga5694252007-07-17 04:04:28 -0700316struct export_operations;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800317struct hd_geometry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318struct iovec;
319struct nameidata;
Christoph Hellwig92198f72005-06-23 22:00:59 -0700320struct kiocb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321struct pipe_inode_info;
322struct poll_table_struct;
323struct kstatfs;
324struct vm_area_struct;
325struct vfsmount;
David Howells745ca242008-11-14 10:39:22 +1100326struct cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Denis Cheng74bf17c2007-10-16 23:26:30 -0700328extern void __init inode_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329extern void __init inode_init_early(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330extern void __init files_init(unsigned long);
331
Jan Engelhardtdded4f42008-12-01 14:34:50 -0800332extern struct files_stat_struct files_stat;
333extern int get_max_files(void);
334extern int sysctl_nr_open;
335extern struct inodes_stat_t inodes_stat;
336extern int leases_enable, lease_break_time;
337#ifdef CONFIG_DNOTIFY
338extern int dir_notify_enable;
339#endif
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341struct buffer_head;
342typedef int (get_block_t)(struct inode *inode, sector_t iblock,
343 struct buffer_head *bh_result, int create);
Christoph Hellwig92198f72005-06-23 22:00:59 -0700344typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 ssize_t bytes, void *private);
346
347/*
348 * Attribute flags. These should be or-ed together to figure out what
349 * has been changed!
350 */
Miklos Szeredi9767d742008-07-01 15:01:26 +0200351#define ATTR_MODE (1 << 0)
352#define ATTR_UID (1 << 1)
353#define ATTR_GID (1 << 2)
354#define ATTR_SIZE (1 << 3)
355#define ATTR_ATIME (1 << 4)
356#define ATTR_MTIME (1 << 5)
357#define ATTR_CTIME (1 << 6)
358#define ATTR_ATIME_SET (1 << 7)
359#define ATTR_MTIME_SET (1 << 8)
360#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
361#define ATTR_ATTR_FLAG (1 << 10)
362#define ATTR_KILL_SUID (1 << 11)
363#define ATTR_KILL_SGID (1 << 12)
364#define ATTR_FILE (1 << 13)
365#define ATTR_KILL_PRIV (1 << 14)
366#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
367#define ATTR_TIMES_SET (1 << 16)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369/*
370 * This is the Inode Attributes structure, used for notify_change(). It
371 * uses the above definitions as flags, to know which values have changed.
372 * Also, in this manner, a Filesystem can look at only the values it cares
373 * about. Basically, these are the attributes that the VFS layer can
374 * request to change from the FS layer.
375 *
376 * Derek Atkins <warlord@MIT.EDU> 94-10-20
377 */
378struct iattr {
379 unsigned int ia_valid;
380 umode_t ia_mode;
381 uid_t ia_uid;
382 gid_t ia_gid;
383 loff_t ia_size;
384 struct timespec ia_atime;
385 struct timespec ia_mtime;
386 struct timespec ia_ctime;
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800387
388 /*
389 * Not an attribute, but an auxilary info for filesystems wanting to
390 * implement an ftruncate() like method. NOTE: filesystem should
391 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
392 */
393 struct file *ia_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394};
395
396/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 * Includes for diskquotas.
398 */
399#include <linux/quota.h>
400
Zach Brown994fc28c2005-12-15 14:28:17 -0800401/**
402 * enum positive_aop_returns - aop return codes with specific semantics
403 *
404 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
405 * completed, that the page is still locked, and
406 * should be considered active. The VM uses this hint
407 * to return the page to the active list -- it won't
408 * be a candidate for writeback again in the near
409 * future. Other callers must be careful to unlock
410 * the page if they get this return. Returned by
411 * writepage();
412 *
413 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
414 * unlocked it and the page might have been truncated.
415 * The caller should back up to acquiring a new page and
416 * trying again. The aop will be taking reasonable
417 * precautions not to livelock. If the caller held a page
418 * reference, it should drop it before retrying. Returned
Nick Piggin55144762007-10-16 01:25:26 -0700419 * by readpage().
Zach Brown994fc28c2005-12-15 14:28:17 -0800420 *
421 * address_space_operation functions return these large constants to indicate
422 * special semantics to the caller. These are much larger than the bytes in a
423 * page to allow for functions that return the number of bytes operated on in a
424 * given page.
425 */
426
427enum positive_aop_returns {
428 AOP_WRITEPAGE_ACTIVATE = 0x80000,
429 AOP_TRUNCATED_PAGE = 0x80001,
430};
431
Nick Pigginafddba42007-10-16 01:25:01 -0700432#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
Nick Piggin89e10782007-10-16 01:25:07 -0700433#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
Nick Piggin54566b22009-01-04 12:00:53 -0800434#define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
435 * helper code (eg buffer layer)
436 * to clear GFP_FS from alloc */
Nick Pigginafddba42007-10-16 01:25:01 -0700437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438/*
439 * oh the beauties of C type declarations.
440 */
441struct page;
442struct address_space;
443struct writeback_control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Nick Piggin2f718ff2007-10-16 01:24:59 -0700445struct iov_iter {
446 const struct iovec *iov;
447 unsigned long nr_segs;
448 size_t iov_offset;
449 size_t count;
450};
451
452size_t iov_iter_copy_from_user_atomic(struct page *page,
453 struct iov_iter *i, unsigned long offset, size_t bytes);
454size_t iov_iter_copy_from_user(struct page *page,
455 struct iov_iter *i, unsigned long offset, size_t bytes);
456void iov_iter_advance(struct iov_iter *i, size_t bytes);
Nick Pigginafddba42007-10-16 01:25:01 -0700457int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700458size_t iov_iter_single_seg_count(struct iov_iter *i);
459
460static inline void iov_iter_init(struct iov_iter *i,
461 const struct iovec *iov, unsigned long nr_segs,
462 size_t count, size_t written)
463{
464 i->iov = iov;
465 i->nr_segs = nr_segs;
466 i->iov_offset = 0;
467 i->count = count + written;
468
469 iov_iter_advance(i, written);
470}
471
472static inline size_t iov_iter_count(struct iov_iter *i)
473{
474 return i->count;
475}
476
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700477/*
478 * "descriptor" for what we're up to with a read.
479 * This allows us to use the same read code yet
480 * have multiple different users of the data that
481 * we read from a file.
482 *
483 * The simplest case just copies the data to user
484 * mode.
485 */
486typedef struct {
487 size_t written;
488 size_t count;
489 union {
490 char __user *buf;
491 void *data;
492 } arg;
493 int error;
494} read_descriptor_t;
495
496typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
497 unsigned long, unsigned long);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499struct address_space_operations {
500 int (*writepage)(struct page *page, struct writeback_control *wbc);
501 int (*readpage)(struct file *, struct page *);
NeilBrown3978d712006-03-26 01:37:17 -0800502 void (*sync_page)(struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 /* Write back some dirty pages from this mapping. */
505 int (*writepages)(struct address_space *, struct writeback_control *);
506
Andrew Morton4741c9f2006-03-24 03:18:11 -0800507 /* Set a page dirty. Return true if this dirtied it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 int (*set_page_dirty)(struct page *page);
509
510 int (*readpages)(struct file *filp, struct address_space *mapping,
511 struct list_head *pages, unsigned nr_pages);
512
Nick Pigginafddba42007-10-16 01:25:01 -0700513 int (*write_begin)(struct file *, struct address_space *mapping,
514 loff_t pos, unsigned len, unsigned flags,
515 struct page **pagep, void **fsdata);
516 int (*write_end)(struct file *, struct address_space *mapping,
517 loff_t pos, unsigned len, unsigned copied,
518 struct page *page, void *fsdata);
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
521 sector_t (*bmap)(struct address_space *, sector_t);
NeilBrown2ff28e22006-03-26 01:37:18 -0800522 void (*invalidatepage) (struct page *, unsigned long);
Al Viro27496a82005-10-21 03:20:48 -0400523 int (*releasepage) (struct page *, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
525 loff_t offset, unsigned long nr_segs);
Nick Piggin70688e42008-04-28 02:13:02 -0700526 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
527 void **, unsigned long *);
Christoph Lametere965f962006-02-01 03:05:41 -0800528 /* migrate the contents of a page to the specified target */
Christoph Lameter2d1db3b2006-06-23 02:03:33 -0700529 int (*migratepage) (struct address_space *,
530 struct page *, struct page *);
Trond Myklebuste3db7692007-01-10 23:15:39 -0800531 int (*launder_page) (struct page *);
Hisashi Hifumi8ab22b92008-07-28 15:46:36 -0700532 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
533 unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534};
535
Nick Pigginafddba42007-10-16 01:25:01 -0700536/*
537 * pagecache_write_begin/pagecache_write_end must be used by general code
538 * to write into the pagecache.
539 */
540int pagecache_write_begin(struct file *, struct address_space *mapping,
541 loff_t pos, unsigned len, unsigned flags,
542 struct page **pagep, void **fsdata);
543
544int pagecache_write_end(struct file *, struct address_space *mapping,
545 loff_t pos, unsigned len, unsigned copied,
546 struct page *page, void *fsdata);
547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548struct backing_dev_info;
549struct address_space {
550 struct inode *host; /* owner: inode, block_device */
551 struct radix_tree_root page_tree; /* radix tree of all pages */
Nick Piggin19fd6232008-07-25 19:45:32 -0700552 spinlock_t tree_lock; /* and lock protecting it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
554 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
555 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
556 spinlock_t i_mmap_lock; /* protect tree, count, list */
557 unsigned int truncate_count; /* Cover race condition with truncate */
558 unsigned long nrpages; /* number of total pages */
559 pgoff_t writeback_index;/* writeback starts here */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700560 const struct address_space_operations *a_ops; /* methods */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 unsigned long flags; /* error bits/gfp mask */
562 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
563 spinlock_t private_lock; /* for use by the address_space */
564 struct list_head private_list; /* ditto */
565 struct address_space *assoc_mapping; /* ditto */
566} __attribute__((aligned(sizeof(long))));
567 /*
568 * On most architectures that alignment is already the case; but
569 * must be enforced here for CRIS, to let the least signficant bit
570 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
571 */
572
573struct block_device {
574 dev_t bd_dev; /* not a kdev_t - it's a search key */
575 struct inode * bd_inode; /* will die */
Theodore Ts'o87d8fe12009-01-03 09:47:09 -0500576 struct super_block * bd_super;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 int bd_openers;
Arjan van de Venc039e312006-03-23 03:00:28 -0800578 struct mutex bd_mutex; /* open/close mutex */
David Chinnerf73ca1b2007-01-10 23:15:41 -0800579 struct semaphore bd_mount_sem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 struct list_head bd_inodes;
581 void * bd_holder;
582 int bd_holders;
Jun'ichi Nomura641dc632006-03-27 01:17:57 -0800583#ifdef CONFIG_SYSFS
584 struct list_head bd_holder_list;
585#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 struct block_device * bd_contains;
587 unsigned bd_block_size;
588 struct hd_struct * bd_part;
589 /* number of times partitions within this device have been opened. */
590 unsigned bd_part_count;
591 int bd_invalidated;
592 struct gendisk * bd_disk;
593 struct list_head bd_list;
594 struct backing_dev_info *bd_inode_backing_dev_info;
595 /*
596 * Private data. You must have bd_claim'ed the block_device
597 * to use this. NOTE: bd_claim allows an owner to claim
598 * the same device multiple times, the owner must take special
599 * care to not mess up bd_private for that case.
600 */
601 unsigned long bd_private;
Takashi Satofcccf502009-01-09 16:40:59 -0800602
603 /* The counter of freeze processes */
604 int bd_fsfreeze_count;
605 /* Mutex for freeze */
606 struct mutex bd_fsfreeze_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607};
608
609/*
610 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
611 * radix trees
612 */
613#define PAGECACHE_TAG_DIRTY 0
614#define PAGECACHE_TAG_WRITEBACK 1
615
616int mapping_tagged(struct address_space *mapping, int tag);
617
618/*
619 * Might pages of this file be mapped into userspace?
620 */
621static inline int mapping_mapped(struct address_space *mapping)
622{
623 return !prio_tree_empty(&mapping->i_mmap) ||
624 !list_empty(&mapping->i_mmap_nonlinear);
625}
626
627/*
628 * Might pages of this file have been modified in userspace?
629 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
630 * marks vma as VM_SHARED if it is shared, and the file was opened for
631 * writing i.e. vma may be mprotected writable even if now readonly.
632 */
633static inline int mapping_writably_mapped(struct address_space *mapping)
634{
635 return mapping->i_mmap_writable != 0;
636}
637
638/*
639 * Use sequence counter to get consistent i_size on 32-bit processors.
640 */
641#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
642#include <linux/seqlock.h>
643#define __NEED_I_SIZE_ORDERED
644#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
645#else
646#define i_size_ordered_init(inode) do { } while (0)
647#endif
648
649struct inode {
650 struct hlist_node i_hash;
651 struct list_head i_list;
652 struct list_head i_sb_list;
653 struct list_head i_dentry;
654 unsigned long i_ino;
655 atomic_t i_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 unsigned int i_nlink;
657 uid_t i_uid;
658 gid_t i_gid;
659 dev_t i_rdev;
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500660 u64 i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 loff_t i_size;
Eric Dumazet83b7b442006-12-06 20:38:53 -0800662#ifdef __NEED_I_SIZE_ORDERED
663 seqcount_t i_size_seqcount;
664#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 struct timespec i_atime;
666 struct timespec i_mtime;
667 struct timespec i_ctime;
668 unsigned int i_blkbits;
Takashi Satoa0f62ac2006-03-26 01:37:52 -0800669 blkcnt_t i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 unsigned short i_bytes;
Arnaldo Carvalho de Melo12d40e42006-12-06 20:39:53 -0800671 umode_t i_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800673 struct mutex i_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 struct rw_semaphore i_alloc_sem;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800675 const struct inode_operations *i_op;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800676 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 struct super_block *i_sb;
678 struct file_lock *i_flock;
679 struct address_space *i_mapping;
680 struct address_space i_data;
681#ifdef CONFIG_QUOTA
682 struct dquot *i_dquot[MAXQUOTAS];
683#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 struct list_head i_devices;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700685 union {
686 struct pipe_inode_info *i_pipe;
Theodore Ts'oeaf796e2006-09-27 01:50:48 -0700687 struct block_device *i_bdev;
Theodore Ts'o577c4eb2006-09-27 01:50:49 -0700688 struct cdev *i_cdev;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700689 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 int i_cindex;
691
692 __u32 i_generation;
693
694#ifdef CONFIG_DNOTIFY
695 unsigned long i_dnotify_mask; /* Directory notify events */
696 struct dnotify_struct *i_dnotify; /* for directory notifications */
697#endif
698
Robert Love0eeca282005-07-12 17:06:03 -0400699#ifdef CONFIG_INOTIFY
700 struct list_head inotify_watches; /* watches on this inode */
Ingo Molnard4f9af92006-03-23 03:00:30 -0800701 struct mutex inotify_mutex; /* protects the watches list */
Robert Love0eeca282005-07-12 17:06:03 -0400702#endif
703
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 unsigned long i_state;
705 unsigned long dirtied_when; /* jiffies of first dirtying */
706
707 unsigned int i_flags;
708
709 atomic_t i_writecount;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700710#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 void *i_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700712#endif
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700713 void *i_private; /* fs or device private pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714};
715
716/*
Ingo Molnarf2eace22006-07-03 00:25:05 -0700717 * inode->i_mutex nesting subclasses for the lock validator:
718 *
719 * 0: the object of the current VFS operation
720 * 1: parent
721 * 2: child/target
722 * 3: quota file
723 *
724 * The locking order between these classes is
Ingo Molnar4df46242006-08-27 01:23:56 -0700725 * parent -> child -> normal -> xattr -> quota
Ingo Molnarf2eace22006-07-03 00:25:05 -0700726 */
727enum inode_i_mutex_lock_class
728{
729 I_MUTEX_NORMAL,
730 I_MUTEX_PARENT,
731 I_MUTEX_CHILD,
Ingo Molnar4df46242006-08-27 01:23:56 -0700732 I_MUTEX_XATTR,
Ingo Molnarf2eace22006-07-03 00:25:05 -0700733 I_MUTEX_QUOTA
734};
735
Mark Fasheh62752ee2006-10-17 10:31:38 +0200736extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
737extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
738
Ingo Molnarf2eace22006-07-03 00:25:05 -0700739/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 * NOTE: in a 32bit arch with a preemptable kernel and
741 * an UP compile the i_size_read/write must be atomic
742 * with respect to the local cpu (unlike with preempt disabled),
743 * but they don't need to be atomic with respect to other cpus like in
744 * true SMP (so they need either to either locally disable irq around
745 * the read or for example on x86 they can be still implemented as a
746 * cmpxchg8b without the need of the lock prefix). For SMP compiles
747 * and 64bit archs it makes no difference if preempt is enabled or not.
748 */
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800749static inline loff_t i_size_read(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750{
751#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
752 loff_t i_size;
753 unsigned int seq;
754
755 do {
756 seq = read_seqcount_begin(&inode->i_size_seqcount);
757 i_size = inode->i_size;
758 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
759 return i_size;
760#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
761 loff_t i_size;
762
763 preempt_disable();
764 i_size = inode->i_size;
765 preempt_enable();
766 return i_size;
767#else
768 return inode->i_size;
769#endif
770}
771
Miklos Szeredi7762f5a2006-10-17 00:10:07 -0700772/*
773 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
774 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
775 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
776 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777static inline void i_size_write(struct inode *inode, loff_t i_size)
778{
779#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
780 write_seqcount_begin(&inode->i_size_seqcount);
781 inode->i_size = i_size;
782 write_seqcount_end(&inode->i_size_seqcount);
783#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
784 preempt_disable();
785 inode->i_size = i_size;
786 preempt_enable();
787#else
788 inode->i_size = i_size;
789#endif
790}
791
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800792static inline unsigned iminor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793{
794 return MINOR(inode->i_rdev);
795}
796
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800797static inline unsigned imajor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798{
799 return MAJOR(inode->i_rdev);
800}
801
802extern struct block_device *I_BDEV(struct inode *inode);
803
804struct fown_struct {
805 rwlock_t lock; /* protects pid, uid, euid fields */
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700806 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
807 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 uid_t uid, euid; /* uid/euid of process setting the owner */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 int signum; /* posix.1b rt signal to be delivered on IO */
810};
811
812/*
813 * Track a single file's readahead state
814 */
815struct file_ra_state {
Fengguang Wu937085a2007-10-16 01:24:31 -0700816 pgoff_t start; /* where readahead started */
817 unsigned int size; /* # of readahead pages */
818 unsigned int async_size; /* do asynchronous readahead when
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700819 there are only # of pages ahead */
Fengguang Wu5ce11102007-07-19 01:47:59 -0700820
Fengguang Wu937085a2007-10-16 01:24:31 -0700821 unsigned int ra_pages; /* Maximum readahead window */
Fengguang Wu0bb7ba62007-10-16 01:24:32 -0700822 int mmap_miss; /* Cache miss stat for mmap accesses */
Fengguang Wuf4e6b492007-10-16 01:24:33 -0700823 loff_t prev_pos; /* Cache last read() position */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Fengguang Wu5ce11102007-07-19 01:47:59 -0700826/*
Fengguang Wu5ce11102007-07-19 01:47:59 -0700827 * Check if @index falls in the readahead windows.
828 */
829static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
830{
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700831 return (index >= ra->start &&
832 index < ra->start + ra->size);
Fengguang Wu5ce11102007-07-19 01:47:59 -0700833}
834
Dave Hansenad775f52008-02-15 14:38:01 -0800835#define FILE_MNT_WRITE_TAKEN 1
836#define FILE_MNT_WRITE_RELEASED 2
837
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838struct file {
Eric Dumazet2f512012005-10-30 15:02:16 -0800839 /*
840 * fu_list becomes invalid after file_free is called and queued via
841 * fu_rcuhead for RCU freeing
842 */
843 union {
844 struct list_head fu_list;
845 struct rcu_head fu_rcuhead;
846 } f_u;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800847 struct path f_path;
848#define f_dentry f_path.dentry
849#define f_vfsmnt f_path.mnt
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800850 const struct file_operations *f_op;
Al Viro516e0cc2008-07-26 00:39:17 -0400851 atomic_long_t f_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 unsigned int f_flags;
Al Viroaeb5d722008-09-02 15:28:45 -0400853 fmode_t f_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 loff_t f_pos;
855 struct fown_struct f_owner;
David Howellsd76b0d92008-11-14 10:39:25 +1100856 const struct cred *f_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 struct file_ra_state f_ra;
858
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -0700859 u64 f_version;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700860#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 void *f_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700862#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 /* needed for tty driver, and maybe others */
864 void *private_data;
865
866#ifdef CONFIG_EPOLL
867 /* Used by fs/eventpoll.c to link all the hooks to this file */
868 struct list_head f_ep_links;
869 spinlock_t f_ep_lock;
870#endif /* #ifdef CONFIG_EPOLL */
871 struct address_space *f_mapping;
Dave Hansenad775f52008-02-15 14:38:01 -0800872#ifdef CONFIG_DEBUG_WRITECOUNT
873 unsigned long f_mnt_write_state;
874#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875};
876extern spinlock_t files_lock;
877#define file_list_lock() spin_lock(&files_lock);
878#define file_list_unlock() spin_unlock(&files_lock);
879
Al Viro516e0cc2008-07-26 00:39:17 -0400880#define get_file(x) atomic_long_inc(&(x)->f_count)
881#define file_count(x) atomic_long_read(&(x)->f_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Dave Hansenad775f52008-02-15 14:38:01 -0800883#ifdef CONFIG_DEBUG_WRITECOUNT
884static inline void file_take_write(struct file *f)
885{
886 WARN_ON(f->f_mnt_write_state != 0);
887 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
888}
889static inline void file_release_write(struct file *f)
890{
891 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
892}
893static inline void file_reset_write(struct file *f)
894{
895 f->f_mnt_write_state = 0;
896}
897static inline void file_check_state(struct file *f)
898{
899 /*
900 * At this point, either both or neither of these bits
901 * should be set.
902 */
903 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
904 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
905}
906static inline int file_check_writeable(struct file *f)
907{
908 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
909 return 0;
910 printk(KERN_WARNING "writeable file with no "
911 "mnt_want_write()\n");
912 WARN_ON(1);
913 return -EINVAL;
914}
915#else /* !CONFIG_DEBUG_WRITECOUNT */
916static inline void file_take_write(struct file *filp) {}
917static inline void file_release_write(struct file *filp) {}
918static inline void file_reset_write(struct file *filp) {}
919static inline void file_check_state(struct file *filp) {}
920static inline int file_check_writeable(struct file *filp)
921{
922 return 0;
923}
924#endif /* CONFIG_DEBUG_WRITECOUNT */
925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926#define MAX_NON_LFS ((1UL<<31) - 1)
927
928/* Page cache limit. The filesystems should put that into their s_maxbytes
929 limits, otherwise bad things can happen in VM. */
930#if BITS_PER_LONG==32
931#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
932#elif BITS_PER_LONG==64
933#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
934#endif
935
936#define FL_POSIX 1
937#define FL_FLOCK 2
938#define FL_ACCESS 8 /* not trying to lock, just looking */
Trond Myklebustf475ae92006-06-29 16:38:32 -0400939#define FL_EXISTS 16 /* when unlocking, test for existence */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940#define FL_LEASE 32 /* lease held on this file */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700941#define FL_CLOSE 64 /* unlock on close */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942#define FL_SLEEP 128 /* A blocking lock */
943
944/*
Miklos Szeredibde74e42008-07-25 01:48:57 -0700945 * Special return value from posix_lock_file() and vfs_lock_file() for
946 * asynchronous locking.
947 */
948#define FILE_LOCK_DEFERRED 1
949
950/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 * The POSIX file lock owner is determined by
952 * the "struct files_struct" in the thread group
953 * (or NULL for no owner - BSD locks).
954 *
955 * Lockd stuffs a "host" pointer into this.
956 */
957typedef struct files_struct *fl_owner_t;
958
959struct file_lock_operations {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
961 void (*fl_release_private)(struct file_lock *);
962};
963
964struct lock_manager_operations {
965 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
966 void (*fl_notify)(struct file_lock *); /* unblock callback */
Marc Eshel2beb6612006-12-05 23:31:28 -0500967 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
969 void (*fl_release_private)(struct file_lock *);
970 void (*fl_break)(struct file_lock *);
971 int (*fl_mylease)(struct file_lock *, struct file_lock *);
972 int (*fl_change)(struct file_lock **, int);
973};
974
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -0400975struct lock_manager {
976 struct list_head list;
977};
978
979void locks_start_grace(struct lock_manager *);
980void locks_end_grace(struct lock_manager *);
981int locks_in_grace(void);
982
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983/* that will die - we need it for nfs_lock_info */
984#include <linux/nfs_fs_i.h>
985
986struct file_lock {
987 struct file_lock *fl_next; /* singly linked list for this inode */
988 struct list_head fl_link; /* doubly linked list of all locks */
989 struct list_head fl_block; /* circular list of blocked processes */
990 fl_owner_t fl_owner;
Richard Kennedyafc12462008-07-11 17:20:49 -0700991 unsigned char fl_flags;
992 unsigned char fl_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 unsigned int fl_pid;
Vitaliy Gusevab1f1612008-01-17 00:07:08 +0000994 struct pid *fl_nspid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 wait_queue_head_t fl_wait;
996 struct file *fl_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 loff_t fl_start;
998 loff_t fl_end;
999
1000 struct fasync_struct * fl_fasync; /* for lease break notifications */
1001 unsigned long fl_break_time; /* for nonblocking lease breaks */
1002
1003 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
1004 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
1005 union {
1006 struct nfs_lock_info nfs_fl;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +00001007 struct nfs4_lock_info nfs4_fl;
David Howellse8d6c552007-07-15 23:40:12 -07001008 struct {
1009 struct list_head link; /* link in AFS vnode's pending_locks list */
1010 int state; /* state of grant or error if -ve */
1011 } afs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 } fl_u;
1013};
1014
1015/* The following constant reflects the upper bound of the file/locking space */
1016#ifndef OFFSET_MAX
1017#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1018#define OFFSET_MAX INT_LIMIT(loff_t)
1019#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1020#endif
1021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022#include <linux/fcntl.h>
1023
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001024extern void send_sigio(struct fown_struct *fown, int fd, int band);
1025
1026/* fs/sync.c */
1027extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
1028 loff_t endbyte, unsigned int flags);
1029
1030#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031extern int fcntl_getlk(struct file *, struct flock __user *);
Peter Staubachc2936212005-07-27 11:45:09 -07001032extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1033 struct flock __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
1035#if BITS_PER_LONG == 32
1036extern int fcntl_getlk64(struct file *, struct flock64 __user *);
Peter Staubachc2936212005-07-27 11:45:09 -07001037extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1038 struct flock64 __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039#endif
1040
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1042extern int fcntl_getlease(struct file *filp);
1043
1044/* fs/locks.c */
1045extern void locks_init_lock(struct file_lock *);
1046extern void locks_copy_lock(struct file_lock *, struct file_lock *);
J. Bruce Fields1a747ee2008-04-24 10:08:22 -04001047extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048extern void locks_remove_posix(struct file *, fl_owner_t);
1049extern void locks_remove_flock(struct file *);
J. Bruce Fields6d34ac12007-05-11 16:09:32 -04001050extern void posix_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001051extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052extern int posix_lock_file_wait(struct file *, struct file_lock *);
J. Bruce Fields64a318e2006-01-03 09:55:46 +01001053extern int posix_unblock_lock(struct file *, struct file_lock *);
J. Bruce Fields3ee17ab2007-02-21 00:58:50 -05001054extern int vfs_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -05001055extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
Marc Eshel9b9d2ab2007-01-18 17:52:58 -05001056extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1058extern int __break_lease(struct inode *inode, unsigned int flags);
1059extern void lease_get_mtime(struct inode *, struct timespec *time);
Christoph Hellwig0af1a452007-07-31 00:39:22 -07001060extern int generic_setlease(struct file *, long, struct file_lock **);
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -04001061extern int vfs_setlease(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062extern int lease_modify(struct file_lock **, int);
1063extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1064extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001065#else /* !CONFIG_FILE_LOCKING */
1066#define fcntl_getlk(a, b) ({ -EINVAL; })
1067#define fcntl_setlk(a, b, c, d) ({ -EACCES; })
1068#if BITS_PER_LONG == 32
1069#define fcntl_getlk64(a, b) ({ -EINVAL; })
1070#define fcntl_setlk64(a, b, c, d) ({ -EACCES; })
1071#endif
1072#define fcntl_setlease(a, b, c) ({ 0; })
1073#define fcntl_getlease(a) ({ 0; })
1074#define locks_init_lock(a) ({ })
1075#define __locks_copy_lock(a, b) ({ })
1076#define locks_copy_lock(a, b) ({ })
1077#define locks_remove_posix(a, b) ({ })
1078#define locks_remove_flock(a) ({ })
1079#define posix_test_lock(a, b) ({ 0; })
1080#define posix_lock_file(a, b, c) ({ -ENOLCK; })
1081#define posix_lock_file_wait(a, b) ({ -ENOLCK; })
1082#define posix_unblock_lock(a, b) (-ENOENT)
1083#define vfs_test_lock(a, b) ({ 0; })
1084#define vfs_lock_file(a, b, c, d) (-ENOLCK)
1085#define vfs_cancel_lock(a, b) ({ 0; })
1086#define flock_lock_file_wait(a, b) ({ -ENOLCK; })
1087#define __break_lease(a, b) ({ 0; })
1088#define lease_get_mtime(a, b) ({ })
1089#define generic_setlease(a, b, c) ({ -EINVAL; })
1090#define vfs_setlease(a, b, c) ({ -EINVAL; })
1091#define lease_modify(a, b) ({ -EINVAL; })
1092#define lock_may_read(a, b, c) ({ 1; })
1093#define lock_may_write(a, b, c) ({ 1; })
1094#endif /* !CONFIG_FILE_LOCKING */
1095
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
1097struct fasync_struct {
1098 int magic;
1099 int fa_fd;
1100 struct fasync_struct *fa_next; /* singly linked list */
1101 struct file *fa_file;
1102};
1103
1104#define FASYNC_MAGIC 0x4601
1105
1106/* SMP safe fasync helpers: */
1107extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1108/* can be called from interrupts */
1109extern void kill_fasync(struct fasync_struct **, int, int);
1110/* only for net: no internal synchronization */
1111extern void __kill_fasync(struct fasync_struct *, int, int);
1112
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001113extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114extern int f_setown(struct file *filp, unsigned long arg, int force);
1115extern void f_delown(struct file *filp);
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001116extern pid_t f_getown(struct file *filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117extern int send_sigurg(struct fown_struct *fown);
1118
1119/*
1120 * Umount options
1121 */
1122
1123#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1124#define MNT_DETACH 0x00000002 /* Just detach from the tree */
1125#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1126
1127extern struct list_head super_blocks;
1128extern spinlock_t sb_lock;
1129
Kentaro Makitada3bbdd2008-07-23 21:27:13 -07001130#define sb_entry(list) list_entry((list), struct super_block, s_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131#define S_BIAS (1<<30)
1132struct super_block {
1133 struct list_head s_list; /* Keep this first */
1134 dev_t s_dev; /* search index; _not_ kdev_t */
1135 unsigned long s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 unsigned char s_blocksize_bits;
1137 unsigned char s_dirt;
1138 unsigned long long s_maxbytes; /* Max file size */
1139 struct file_system_type *s_type;
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001140 const struct super_operations *s_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 struct dquot_operations *dq_op;
1142 struct quotactl_ops *s_qcop;
Christoph Hellwig39655162007-10-21 16:42:17 -07001143 const struct export_operations *s_export_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 unsigned long s_flags;
1145 unsigned long s_magic;
1146 struct dentry *s_root;
1147 struct rw_semaphore s_umount;
Ingo Molnar7892f2f2006-01-09 15:59:25 -08001148 struct mutex s_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 int s_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 int s_need_sync_fs;
1151 atomic_t s_active;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001152#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 void *s_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001154#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 struct xattr_handler **s_xattr;
1156
1157 struct list_head s_inodes; /* all inodes */
1158 struct list_head s_dirty; /* dirty inodes */
1159 struct list_head s_io; /* parked for writeback */
Ken Chen0e0f4fc2007-10-16 23:30:38 -07001160 struct list_head s_more_io; /* parked for more writeback */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1162 struct list_head s_files;
Kentaro Makitada3bbdd2008-07-23 21:27:13 -07001163 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1164 struct list_head s_dentry_lru; /* unused dentry lru */
1165 int s_nr_dentry_unused; /* # of dentry on lru */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
1167 struct block_device *s_bdev;
David Howellsacaebfd2007-05-10 22:51:50 -07001168 struct mtd_info *s_mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 struct list_head s_instances;
1170 struct quota_info s_dquot; /* Diskquota specific options */
1171
1172 int s_frozen;
1173 wait_queue_head_t s_wait_unfrozen;
1174
1175 char s_id[32]; /* Informational name */
1176
1177 void *s_fs_info; /* Filesystem private info */
Al Viro30c40d22008-02-22 19:50:45 -05001178 fmode_t s_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
1180 /*
1181 * The next field is for VFS *only*. No filesystems have any business
1182 * even looking at it. You had been warned.
1183 */
Arjan van de Vena11f3a02006-03-23 03:00:33 -08001184 struct mutex s_vfs_rename_mutex; /* Kludge */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
Kalin KOZHUHAROV8ba8e952006-04-01 01:41:22 +02001186 /* Granularity of c/m/atime in ns.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 Cannot be worse than a second */
1188 u32 s_time_gran;
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001189
1190 /*
1191 * Filesystem subtype. If non-empty the filesystem type field
1192 * in /proc/mounts will be "type.subtype"
1193 */
1194 char *s_subtype;
Miklos Szeredib3b304a2008-02-08 04:21:35 -08001195
1196 /*
1197 * Saved mount options for lazy filesystems using
1198 * generic_show_options()
1199 */
1200 char *s_options;
Arjan van de Venefaee192009-01-06 07:20:54 -08001201
1202 /*
1203 * storage for asynchronous operations
1204 */
1205 struct list_head s_async_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206};
1207
1208extern struct timespec current_fs_time(struct super_block *sb);
1209
1210/*
1211 * Snapshotting support.
1212 */
1213enum {
1214 SB_UNFROZEN = 0,
1215 SB_FREEZE_WRITE = 1,
1216 SB_FREEZE_TRANS = 2,
1217};
1218
1219#define vfs_check_frozen(sb, level) \
1220 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1221
Al Viro914e2632006-10-18 13:55:46 -04001222#define get_fs_excl() atomic_inc(&current->fs_excl)
1223#define put_fs_excl() atomic_dec(&current->fs_excl)
1224#define has_fs_excl() atomic_read(&current->fs_excl)
Jens Axboe22e2c502005-06-27 10:55:12 +02001225
Satyam Sharma3bd858a2007-07-17 15:00:08 +05301226#define is_owner_or_cap(inode) \
David Howellsda9592e2008-11-14 10:39:05 +11001227 ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
Satyam Sharma3bd858a2007-07-17 15:00:08 +05301228
Al Viro914e2632006-10-18 13:55:46 -04001229/* not quite ready to be deprecated, but... */
1230extern void lock_super(struct super_block *);
1231extern void unlock_super(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
1233/*
1234 * VFS helper functions..
1235 */
1236extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1237extern int vfs_mkdir(struct inode *, struct dentry *, int);
1238extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
Miklos Szeredidb2e7472008-06-24 16:50:16 +02001239extern int vfs_symlink(struct inode *, struct dentry *, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1241extern int vfs_rmdir(struct inode *, struct dentry *);
1242extern int vfs_unlink(struct inode *, struct dentry *);
1243extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1244
1245/*
1246 * VFS dentry helper functions.
1247 */
1248extern void dentry_unhash(struct dentry *dentry);
1249
1250/*
Christoph Hellwig8c744fb2005-11-08 21:35:04 -08001251 * VFS file helper functions.
1252 */
1253extern int file_permission(struct file *, int);
1254
1255/*
Mark Fashehc4b929b2008-10-08 19:44:18 -04001256 * VFS FS_IOC_FIEMAP helper definitions.
1257 */
1258struct fiemap_extent_info {
1259 unsigned int fi_flags; /* Flags as passed from user */
1260 unsigned int fi_extents_mapped; /* Number of mapped extents */
1261 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1262 struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent
1263 * array */
1264};
1265int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1266 u64 phys, u64 len, u32 flags);
1267int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1268
1269/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 * File types
1271 *
1272 * NOTE! These match bits 12..15 of stat.st_mode
1273 * (ie "(i_mode >> 12) & 15").
1274 */
1275#define DT_UNKNOWN 0
1276#define DT_FIFO 1
1277#define DT_CHR 2
1278#define DT_DIR 4
1279#define DT_BLK 6
1280#define DT_REG 8
1281#define DT_LNK 10
1282#define DT_SOCK 12
1283#define DT_WHT 14
1284
1285#define OSYNC_METADATA (1<<0)
1286#define OSYNC_DATA (1<<1)
1287#define OSYNC_INODE (1<<2)
1288int generic_osync_inode(struct inode *, struct address_space *, int);
1289
1290/*
1291 * This is the "filldir" function type, used by readdir() to let
1292 * the kernel specify what kind of dirent layout it wants to have.
1293 * This allows the kernel to read directories into kernel space or
1294 * to have different dirent layouts depending on the binary type.
1295 */
David Howellsafefdbb2006-10-03 01:13:46 -07001296typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
Al Viro08f85852007-10-08 13:26:20 -04001297struct block_device_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299/* These macros are for out of kernel modules to test that
1300 * the kernel supports the unlocked_ioctl and compat_ioctl
1301 * fields in struct file_operations. */
1302#define HAVE_COMPAT_IOCTL 1
1303#define HAVE_UNLOCKED_IOCTL 1
1304
1305/*
1306 * NOTE:
1307 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1308 * can be called without the big kernel lock held in all filesystems.
1309 */
1310struct file_operations {
1311 struct module *owner;
1312 loff_t (*llseek) (struct file *, loff_t, int);
1313 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001315 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1316 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 int (*readdir) (struct file *, void *, filldir_t);
1318 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1319 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1320 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1321 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1322 int (*mmap) (struct file *, struct vm_area_struct *);
1323 int (*open) (struct inode *, struct file *);
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001324 int (*flush) (struct file *, fl_owner_t id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 int (*release) (struct inode *, struct file *);
1326 int (*fsync) (struct file *, struct dentry *, int datasync);
1327 int (*aio_fsync) (struct kiocb *, int datasync);
1328 int (*fasync) (int, struct file *, int);
1329 int (*lock) (struct file *, int, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1331 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1332 int (*check_flags)(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 int (*flock) (struct file *, int, struct file_lock *);
Jens Axboecbb7e572006-04-11 14:57:50 +02001334 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1335 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
J. Bruce Fieldsf9ffed22006-11-14 15:51:40 -05001336 int (*setlease)(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337};
1338
1339struct inode_operations {
1340 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1341 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1342 int (*link) (struct dentry *,struct inode *,struct dentry *);
1343 int (*unlink) (struct inode *,struct dentry *);
1344 int (*symlink) (struct inode *,struct dentry *,const char *);
1345 int (*mkdir) (struct inode *,struct dentry *,int);
1346 int (*rmdir) (struct inode *,struct dentry *);
1347 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1348 int (*rename) (struct inode *, struct dentry *,
1349 struct inode *, struct dentry *);
1350 int (*readlink) (struct dentry *, char __user *,int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001351 void * (*follow_link) (struct dentry *, struct nameidata *);
1352 void (*put_link) (struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 void (*truncate) (struct inode *);
Al Viroe6305c42008-07-15 21:03:57 -04001354 int (*permission) (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 int (*setattr) (struct dentry *, struct iattr *);
1356 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1357 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1358 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1359 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1360 int (*removexattr) (struct dentry *, const char *);
Badari Pulavartyf6b3ec22006-01-06 00:10:38 -08001361 void (*truncate_range)(struct inode *, loff_t, loff_t);
Amit Arora97ac7352007-07-17 21:42:44 -04001362 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1363 loff_t len);
Mark Fashehc4b929b2008-10-08 19:44:18 -04001364 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1365 u64 len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366};
1367
1368struct seq_file;
1369
Badari Pulavartyeed4e512006-09-30 23:28:49 -07001370ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1371 unsigned long nr_segs, unsigned long fast_segs,
1372 struct iovec *fast_pointer,
1373 struct iovec **ret_pointer);
1374
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1376extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1377extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1378 unsigned long, loff_t *);
1379extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1380 unsigned long, loff_t *);
1381
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382struct super_operations {
1383 struct inode *(*alloc_inode)(struct super_block *sb);
1384 void (*destroy_inode)(struct inode *);
1385
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 void (*dirty_inode) (struct inode *);
1387 int (*write_inode) (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 void (*drop_inode) (struct inode *);
1389 void (*delete_inode) (struct inode *);
1390 void (*put_super) (struct super_block *);
1391 void (*write_super) (struct super_block *);
1392 int (*sync_fs)(struct super_block *sb, int wait);
Takashi Satoc4be0c12009-01-09 16:40:58 -08001393 int (*freeze_fs) (struct super_block *);
1394 int (*unfreeze_fs) (struct super_block *);
David Howells726c3342006-06-23 02:02:58 -07001395 int (*statfs) (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 int (*remount_fs) (struct super_block *, int *, char *);
1397 void (*clear_inode) (struct inode *);
Al Viro42faad92008-04-24 07:21:56 -04001398 void (*umount_begin) (struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
1400 int (*show_options)(struct seq_file *, struct vfsmount *);
Chuck Leverb4629fe2006-03-20 13:44:12 -05001401 int (*show_stats)(struct seq_file *, struct vfsmount *);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001402#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1404 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001405#endif
Theodore Ts'o87d8fe12009-01-03 09:47:09 -05001406 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407};
1408
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001409/*
1410 * Inode state bits. Protected by inode_lock.
1411 *
1412 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1413 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1414 *
1415 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1416 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1417 * various stages of removing an inode.
1418 *
1419 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1420 *
Joern Engele7ca2d42008-02-06 01:36:59 -08001421 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1422 * fdatasync(). i_atime is the usual cause.
Jan Kara000cb482008-02-14 19:31:32 -08001423 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1424 * these changes separately from I_DIRTY_SYNC so that we
1425 * don't have to write inode on fdatasync() when only
1426 * mtime has changed in it.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001427 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1428 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1429 * are cleared by unlock_new_inode(), called from iget().
1430 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1431 * is zero. I_FREEING must be set when I_WILL_FREE is
1432 * cleared.
1433 * I_FREEING Set when inode is about to be freed but still has dirty
1434 * pages or buffers attached or the inode itself is still
1435 * dirty.
1436 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1437 * and can be destroyed.
1438 *
1439 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1440 * prohibited for many purposes. iget() must wait for
1441 * the inode to be completely released, then create it
1442 * anew. Other functions will just ignore such inodes,
1443 * if appropriate. I_LOCK is used for waiting.
1444 *
1445 * I_LOCK Serves as both a mutex and completion notification.
1446 * New inodes set I_LOCK. If two processes both create
1447 * the same inode, one of them will release its inode and
1448 * wait for I_LOCK to be released before returning.
1449 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1450 * also cause waiting on I_LOCK, without I_LOCK actually
1451 * being set. find_inode() uses this to prevent returning
1452 * nearly-dead inodes.
1453 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
Joe Perchesfd3f8982008-02-03 17:45:46 +02001454 * of inode dirty data. Having a separate lock for this
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001455 * purpose reduces latency and prevents some filesystem-
1456 * specific deadlocks.
1457 *
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001458 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1459 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1460 * I_CLEAR? If not, why?
1461 */
1462#define I_DIRTY_SYNC 1
1463#define I_DIRTY_DATASYNC 2
1464#define I_DIRTY_PAGES 4
1465#define I_NEW 8
1466#define I_WILL_FREE 16
1467#define I_FREEING 32
1468#define I_CLEAR 64
1469#define __I_LOCK 7
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470#define I_LOCK (1 << __I_LOCK)
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001471#define __I_SYNC 8
1472#define I_SYNC (1 << __I_SYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
1474#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1475
1476extern void __mark_inode_dirty(struct inode *, int);
1477static inline void mark_inode_dirty(struct inode *inode)
1478{
1479 __mark_inode_dirty(inode, I_DIRTY);
1480}
1481
1482static inline void mark_inode_dirty_sync(struct inode *inode)
1483{
1484 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1485}
1486
Dave Hansen71c42152007-06-23 17:16:42 -07001487/**
1488 * inc_nlink - directly increment an inode's link count
1489 * @inode: inode
1490 *
1491 * This is a low-level filesystem helper to replace any
1492 * direct filesystem manipulation of i_nlink. Currently,
1493 * it is only here for parity with dec_nlink().
1494 */
Dave Hansend8c76e62006-09-30 23:29:04 -07001495static inline void inc_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001496{
1497 inode->i_nlink++;
Dave Hansend8c76e62006-09-30 23:29:04 -07001498}
1499
1500static inline void inode_inc_link_count(struct inode *inode)
1501{
1502 inc_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001503 mark_inode_dirty(inode);
1504}
1505
Dave Hansen71c42152007-06-23 17:16:42 -07001506/**
1507 * drop_nlink - directly drop an inode's link count
1508 * @inode: inode
1509 *
1510 * This is a low-level filesystem helper to replace any
1511 * direct filesystem manipulation of i_nlink. In cases
1512 * where we are attempting to track writes to the
1513 * filesystem, a decrement to zero means an imminent
1514 * write when the file is truncated and actually unlinked
1515 * on the filesystem.
1516 */
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001517static inline void drop_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001518{
1519 inode->i_nlink--;
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001520}
1521
Dave Hansen71c42152007-06-23 17:16:42 -07001522/**
1523 * clear_nlink - directly zero an inode's link count
1524 * @inode: inode
1525 *
1526 * This is a low-level filesystem helper to replace any
1527 * direct filesystem manipulation of i_nlink. See
1528 * drop_nlink() for why we care about i_nlink hitting zero.
1529 */
Dave Hansence71ec32006-09-30 23:29:06 -07001530static inline void clear_nlink(struct inode *inode)
1531{
1532 inode->i_nlink = 0;
1533}
1534
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001535static inline void inode_dec_link_count(struct inode *inode)
1536{
1537 drop_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001538 mark_inode_dirty(inode);
1539}
1540
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001541/**
1542 * inode_inc_iversion - increments i_version
1543 * @inode: inode that need to be updated
1544 *
1545 * Every time the inode is modified, the i_version field will be incremented.
1546 * The filesystem has to be mounted with i_version flag
1547 */
1548
1549static inline void inode_inc_iversion(struct inode *inode)
1550{
1551 spin_lock(&inode->i_lock);
1552 inode->i_version++;
1553 spin_unlock(&inode->i_lock);
1554}
1555
Christoph Hellwig869243a2006-01-09 20:52:03 -08001556extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557static inline void file_accessed(struct file *file)
1558{
1559 if (!(file->f_flags & O_NOATIME))
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001560 touch_atime(file->f_path.mnt, file->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561}
1562
1563int sync_inode(struct inode *inode, struct writeback_control *wbc);
1564
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565struct file_system_type {
1566 const char *name;
1567 int fs_flags;
David Howells454e2392006-06-23 02:02:57 -07001568 int (*get_sb) (struct file_system_type *, int,
1569 const char *, void *, struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 void (*kill_sb) (struct super_block *);
1571 struct module *owner;
1572 struct file_system_type * next;
1573 struct list_head fs_supers;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001574
Ingo Molnarcf516242006-07-03 00:25:27 -07001575 struct lock_class_key s_lock_key;
Arjan van de Ven897c6ff2006-07-03 00:25:28 -07001576 struct lock_class_key s_umount_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001577
1578 struct lock_class_key i_lock_key;
1579 struct lock_class_key i_mutex_key;
Peter Zijlstra14358e62007-10-14 01:38:33 +02001580 struct lock_class_key i_mutex_dir_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001581 struct lock_class_key i_alloc_sem_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582};
1583
David Howells454e2392006-06-23 02:02:57 -07001584extern int get_sb_bdev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 int flags, const char *dev_name, void *data,
David Howells454e2392006-06-23 02:02:57 -07001586 int (*fill_super)(struct super_block *, void *, int),
1587 struct vfsmount *mnt);
1588extern int get_sb_single(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001590 int (*fill_super)(struct super_block *, void *, int),
1591 struct vfsmount *mnt);
1592extern int get_sb_nodev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001594 int (*fill_super)(struct super_block *, void *, int),
1595 struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596void generic_shutdown_super(struct super_block *sb);
1597void kill_block_super(struct super_block *sb);
1598void kill_anon_super(struct super_block *sb);
1599void kill_litter_super(struct super_block *sb);
1600void deactivate_super(struct super_block *sb);
1601int set_anon_super(struct super_block *s, void *data);
1602struct super_block *sget(struct file_system_type *type,
1603 int (*test)(struct super_block *,void *),
1604 int (*set)(struct super_block *,void *),
1605 void *data);
David Howells454e2392006-06-23 02:02:57 -07001606extern int get_sb_pseudo(struct file_system_type *, char *,
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001607 const struct super_operations *ops, unsigned long,
David Howells454e2392006-06-23 02:02:57 -07001608 struct vfsmount *mnt);
1609extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610int __put_super_and_need_restart(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611
1612/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1613#define fops_get(fops) \
1614 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1615#define fops_put(fops) \
1616 do { if (fops) module_put((fops)->owner); } while(0)
1617
1618extern int register_filesystem(struct file_system_type *);
1619extern int unregister_filesystem(struct file_system_type *);
Pavel Emelyanov8bf97252007-10-18 23:40:02 -07001620extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1621#define kern_mount(type) kern_mount_data(type, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622extern int may_umount_tree(struct vfsmount *);
1623extern int may_umount(struct vfsmount *);
1624extern long do_mount(char *, char *, char *, unsigned long, void *);
Al Viro8aec0802007-06-07 12:20:32 -04001625extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *);
1626extern void drop_collected_mounts(struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
David Howells726c3342006-06-23 02:02:58 -07001628extern int vfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001630/* /sys/fs */
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001631extern struct kobject *fs_kobj;
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001632
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001633extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1634
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635#define FLOCK_VERIFY_READ 1
1636#define FLOCK_VERIFY_WRITE 2
1637
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001638#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639extern int locks_mandatory_locked(struct inode *);
1640extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1641
1642/*
1643 * Candidates for mandatory locking have the setgid bit set
1644 * but no group execute bit - an otherwise meaningless combination.
1645 */
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001646
1647static inline int __mandatory_lock(struct inode *ino)
1648{
1649 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1650}
1651
1652/*
1653 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1654 * otherwise these will be advisory locks
1655 */
1656
1657static inline int mandatory_lock(struct inode *ino)
1658{
1659 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1660}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661
1662static inline int locks_verify_locked(struct inode *inode)
1663{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001664 if (mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 return locks_mandatory_locked(inode);
1666 return 0;
1667}
1668
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669static inline int locks_verify_truncate(struct inode *inode,
1670 struct file *filp,
1671 loff_t size)
1672{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001673 if (inode->i_flock && mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 return locks_mandatory_area(
1675 FLOCK_VERIFY_WRITE, inode, filp,
1676 size < inode->i_size ? size : inode->i_size,
1677 (size < inode->i_size ? inode->i_size - size
1678 : size - inode->i_size)
1679 );
1680 return 0;
1681}
1682
1683static inline int break_lease(struct inode *inode, unsigned int mode)
1684{
1685 if (inode->i_flock)
1686 return __break_lease(inode, mode);
1687 return 0;
1688}
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001689#else /* !CONFIG_FILE_LOCKING */
1690#define locks_mandatory_locked(a) ({ 0; })
1691#define locks_mandatory_area(a, b, c, d, e) ({ 0; })
1692#define __mandatory_lock(a) ({ 0; })
1693#define mandatory_lock(a) ({ 0; })
1694#define locks_verify_locked(a) ({ 0; })
1695#define locks_verify_truncate(a, b, c) ({ 0; })
1696#define break_lease(a, b) ({ 0; })
1697#endif /* CONFIG_FILE_LOCKING */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698
1699/* fs/open.c */
1700
NeilBrown4a301312006-01-08 01:02:39 -08001701extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1702 struct file *filp);
Jason Uhlenkott8e8a1402007-10-20 03:16:18 +02001703extern long do_sys_open(int dfd, const char __user *filename, int flags,
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001704 int mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705extern struct file *filp_open(const char *, int, int);
David Howells745ca242008-11-14 10:39:22 +11001706extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
1707 const struct cred *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708extern int filp_close(struct file *, fl_owner_t id);
1709extern char * getname(const char __user *);
1710
1711/* fs/dcache.c */
1712extern void __init vfs_caches_init_early(void);
1713extern void __init vfs_caches_init(unsigned long);
1714
Christoph Lameterb86c0892006-12-06 20:32:57 -08001715extern struct kmem_cache *names_cachep;
1716
Christoph Lametere94b1762006-12-06 20:33:17 -08001717#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1719#ifndef CONFIG_AUDITSYSCALL
1720#define putname(name) __putname(name)
1721#else
1722extern void putname(const char *name);
1723#endif
1724
David Howells93614012006-09-30 20:45:40 +02001725#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726extern int register_blkdev(unsigned int, const char *);
Akinobu Mitaf4480242007-07-17 04:03:47 -07001727extern void unregister_blkdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728extern struct block_device *bdget(dev_t);
1729extern void bd_set_size(struct block_device *, loff_t size);
1730extern void bd_forget(struct inode *inode);
1731extern void bdput(struct block_device *);
Al Viroaeb5d722008-09-02 15:28:45 -04001732extern struct block_device *open_by_devnum(dev_t, fmode_t);
David Howells93614012006-09-30 20:45:40 +02001733#else
1734static inline void bd_forget(struct inode *inode) {}
1735#endif
1736extern const struct file_operations def_blk_fops;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001737extern const struct file_operations def_chr_fops;
1738extern const struct file_operations bad_sock_fops;
1739extern const struct file_operations def_fifo_fops;
David Howells93614012006-09-30 20:45:40 +02001740#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
Al Viro56b26ad2008-09-19 03:17:36 -04001742extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
Al Viro572c4892007-10-08 13:24:05 -04001744extern int blkdev_get(struct block_device *, fmode_t);
Al Viro9a1c3542008-02-22 20:40:24 -05001745extern int blkdev_put(struct block_device *, fmode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746extern int bd_claim(struct block_device *, void *);
1747extern void bd_release(struct block_device *);
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08001748#ifdef CONFIG_SYSFS
1749extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1750extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1751#else
1752#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1753#define bd_release_from_disk(bdev, disk) bd_release(bdev)
1754#endif
David Howells93614012006-09-30 20:45:40 +02001755#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756
1757/* fs/char_dev.c */
Joe Korty68eef3b2006-03-31 02:30:32 -08001758#define CHRDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1760extern int register_chrdev_region(dev_t, unsigned, const char *);
1761extern int register_chrdev(unsigned int, const char *,
Arjan van de Ven99ac48f2006-03-28 01:56:41 -08001762 const struct file_operations *);
Akinobu Mitae53252d2007-07-19 01:47:51 -07001763extern void unregister_chrdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764extern void unregister_chrdev_region(dev_t, unsigned);
Joe Korty68eef3b2006-03-31 02:30:32 -08001765extern void chrdev_show(struct seq_file *,off_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766
1767/* fs/block_dev.c */
1768#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
Tejun Heo1f014292008-08-25 19:47:23 +09001769#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
David Howells93614012006-09-30 20:45:40 +02001770
1771#ifdef CONFIG_BLOCK
1772#define BLKDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773extern const char *__bdevname(dev_t, char *buffer);
1774extern const char *bdevname(struct block_device *bdev, char *buffer);
1775extern struct block_device *lookup_bdev(const char *);
Al Viro30c40d22008-02-22 19:50:45 -05001776extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
1777extern void close_bdev_exclusive(struct block_device *, fmode_t);
Joe Korty68eef3b2006-03-31 02:30:32 -08001778extern void blkdev_show(struct seq_file *,off_t);
Al Viro30c40d22008-02-22 19:50:45 -05001779
David Howells93614012006-09-30 20:45:40 +02001780#else
1781#define BLKDEV_MAJOR_HASH_SIZE 0
1782#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783
1784extern void init_special_inode(struct inode *, umode_t, dev_t);
1785
1786/* Invalid inode operations -- fs/bad_inode.c */
1787extern void make_bad_inode(struct inode *);
1788extern int is_bad_inode(struct inode *);
1789
Denys Vlasenkod2d96482008-07-01 14:16:09 +02001790extern const struct file_operations read_pipefifo_fops;
1791extern const struct file_operations write_pipefifo_fops;
1792extern const struct file_operations rdwr_pipefifo_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793
1794extern int fs_may_remount_ro(struct super_block *);
1795
David Howells93614012006-09-30 20:45:40 +02001796#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797/*
1798 * return READ, READA, or WRITE
1799 */
1800#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1801
1802/*
1803 * return data direction, READ or WRITE
1804 */
1805#define bio_data_dir(bio) ((bio)->bi_rw & 1)
1806
Andrew Pattersonc3279d12008-09-04 14:27:25 -06001807extern void check_disk_size_change(struct gendisk *disk,
1808 struct block_device *bdev);
Andrew Patterson0c002c22008-09-04 14:27:20 -06001809extern int revalidate_disk(struct gendisk *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810extern int check_disk_change(struct block_device *);
Christoph Hellwig2ef41632005-05-05 16:15:59 -07001811extern int __invalidate_device(struct block_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812extern int invalidate_partition(struct gendisk *, int);
David Howells93614012006-09-30 20:45:40 +02001813#endif
1814extern int invalidate_inodes(struct super_block *);
Andrew Mortonfc9a07e2007-07-15 23:38:14 -07001815unsigned long __invalidate_mapping_pages(struct address_space *mapping,
1816 pgoff_t start, pgoff_t end,
1817 bool be_atomic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818unsigned long invalidate_mapping_pages(struct address_space *mapping,
1819 pgoff_t start, pgoff_t end);
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08001820
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08001821static inline unsigned long __deprecated
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08001822invalidate_inode_pages(struct address_space *mapping)
1823{
1824 return invalidate_mapping_pages(mapping, 0, ~0UL);
1825}
1826
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827static inline void invalidate_remote_inode(struct inode *inode)
1828{
1829 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1830 S_ISLNK(inode->i_mode))
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08001831 invalidate_mapping_pages(inode->i_mapping, 0, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832}
1833extern int invalidate_inode_pages2(struct address_space *mapping);
1834extern int invalidate_inode_pages2_range(struct address_space *mapping,
1835 pgoff_t start, pgoff_t end);
Artem Bityutskiy4ee6afd2008-05-07 21:01:30 +03001836extern void generic_sync_sb_inodes(struct super_block *sb,
1837 struct writeback_control *wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838extern int write_inode_now(struct inode *, int);
1839extern int filemap_fdatawrite(struct address_space *);
1840extern int filemap_flush(struct address_space *);
1841extern int filemap_fdatawait(struct address_space *);
1842extern int filemap_write_and_wait(struct address_space *mapping);
1843extern int filemap_write_and_wait_range(struct address_space *mapping,
1844 loff_t lstart, loff_t lend);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08001845extern int wait_on_page_writeback_range(struct address_space *mapping,
1846 pgoff_t start, pgoff_t end);
1847extern int __filemap_fdatawrite_range(struct address_space *mapping,
1848 loff_t start, loff_t end, int sync_mode);
Jan Karaf4c0a0f2008-07-11 19:27:31 -04001849extern int filemap_fdatawrite_range(struct address_space *mapping,
1850 loff_t start, loff_t end);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08001851
Christoph Hellwig4c728ef2008-12-22 21:11:15 +01001852extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853extern void sync_supers(void);
1854extern void sync_filesystems(int wait);
David Howellscf9a2ae2006-08-29 19:05:54 +01001855extern void __fsync_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856extern void emergency_sync(void);
1857extern void emergency_remount(void);
1858extern int do_remount_sb(struct super_block *sb, int flags,
1859 void *data, int force);
David Howells93614012006-09-30 20:45:40 +02001860#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861extern sector_t bmap(struct inode *, sector_t);
David Howells93614012006-09-30 20:45:40 +02001862#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863extern int notify_change(struct dentry *, struct iattr *);
Al Virof419a2e2008-07-22 00:07:17 -04001864extern int inode_permission(struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865extern int generic_permission(struct inode *, int,
1866 int (*check_acl)(struct inode *, int));
1867
Miklos Szeredif696a362008-07-31 13:41:58 +02001868static inline bool execute_ok(struct inode *inode)
1869{
1870 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
1871}
1872
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873extern int get_write_access(struct inode *);
1874extern int deny_write_access(struct file *);
1875static inline void put_write_access(struct inode * inode)
1876{
1877 atomic_dec(&inode->i_writecount);
1878}
1879static inline void allow_write_access(struct file *file)
1880{
1881 if (file)
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001882 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883}
1884extern int do_pipe(int *);
Ulrich Dreppered8cae82008-07-23 21:29:30 -07001885extern int do_pipe_flags(int *, int);
Ulrich Drepperbe61a862008-07-23 21:29:40 -07001886extern struct file *create_read_pipe(struct file *f, int flags);
1887extern struct file *create_write_pipe(int flags);
Andi Kleend6cbd282006-09-30 23:29:26 -07001888extern void free_write_pipe(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889
Christoph Hellwiga70e65d2008-02-15 14:37:28 -08001890extern struct file *do_filp_open(int dfd, const char *pathname,
1891 int open_flag, int mode);
Christoph Hellwig3fb64192008-10-24 09:58:10 +02001892extern int may_open(struct path *, int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893
1894extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1895extern struct file * open_exec(const char *);
1896
1897/* fs/dcache.c -- generic fs support functions */
1898extern int is_subdir(struct dentry *, struct dentry *);
1899extern ino_t find_inode_number(struct dentry *, struct qstr *);
1900
1901#include <linux/err.h>
1902
1903/* needed for stackable file system support */
1904extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1905
1906extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1907
David Chinner2cb15992008-10-30 17:32:23 +11001908extern struct inode * inode_init_always(struct super_block *, struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909extern void inode_init_once(struct inode *);
David Chinner8290c352008-10-30 17:35:24 +11001910extern void inode_add_to_lists(struct super_block *, struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911extern void iput(struct inode *);
1912extern struct inode * igrab(struct inode *);
1913extern ino_t iunique(struct super_block *, ino_t);
1914extern int inode_needs_sync(struct inode *inode);
1915extern void generic_delete_inode(struct inode *inode);
Mark Fashehcb2c0232005-07-07 17:56:03 -07001916extern void generic_drop_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917
Anton Altaparmakov88bd5122005-07-13 01:10:44 -07001918extern struct inode *ilookup5_nowait(struct super_block *sb,
1919 unsigned long hashval, int (*test)(struct inode *, void *),
1920 void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1922 int (*test)(struct inode *, void *), void *data);
1923extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1924
1925extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1926extern struct inode * iget_locked(struct super_block *, unsigned long);
Al Viro261bca82008-12-30 01:48:21 -05001927extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
1928extern int insert_inode_locked(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929extern void unlock_new_inode(struct inode *);
1930
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931extern void __iget(struct inode * inode);
David Howellsb46980f2008-02-07 00:15:27 -08001932extern void iget_failed(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933extern void clear_inode(struct inode *);
1934extern void destroy_inode(struct inode *);
1935extern struct inode *new_inode(struct super_block *);
Jens Axboe01de85e2006-10-17 19:50:36 +02001936extern int should_remove_suid(struct dentry *);
Miklos Szeredi2f1936b2008-06-24 16:50:14 +02001937extern int file_remove_suid(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938
1939extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1940extern void remove_inode_hash(struct inode *);
1941static inline void insert_inode_hash(struct inode *inode) {
1942 __insert_inode_hash(inode, inode->i_ino);
1943}
1944
1945extern struct file * get_empty_filp(void);
1946extern void file_move(struct file *f, struct list_head *list);
1947extern void file_kill(struct file *f);
David Howells93614012006-09-30 20:45:40 +02001948#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949struct bio;
1950extern void submit_bio(int, struct bio *);
1951extern int bdev_read_only(struct block_device *);
David Howells93614012006-09-30 20:45:40 +02001952#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953extern int set_blocksize(struct block_device *, int);
1954extern int sb_set_blocksize(struct super_block *, int);
1955extern int sb_min_blocksize(struct super_block *, int);
Fengguang Wu08d8e972007-10-16 23:30:39 -07001956extern int sb_has_dirty_inodes(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957
1958extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1959extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1960extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001962extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001963extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
Badari Pulavarty027445c2006-09-30 23:28:46 -07001965 unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1967 unsigned long *, loff_t, loff_t *, size_t, size_t);
1968extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1969 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1970extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1971extern 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 -07001972extern int generic_segment_checks(const struct iovec *iov,
1973 unsigned long *nr_segs, size_t *count, int access_flags);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001974
1975/* fs/splice.c */
Jens Axboecbb7e572006-04-11 14:57:50 +02001976extern ssize_t generic_file_splice_read(struct file *, loff_t *,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001977 struct pipe_inode_info *, size_t, unsigned int);
1978extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
Jens Axboecbb7e572006-04-11 14:57:50 +02001979 struct file *, loff_t *, size_t, unsigned int);
Mark Fasheh6da61802006-10-17 18:43:07 +02001980extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1981 struct file *, loff_t *, size_t, unsigned int);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001982extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
Jens Axboecbb7e572006-04-11 14:57:50 +02001983 struct file *out, loff_t *, size_t len, unsigned int flags);
1984extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001985 size_t len, unsigned int flags);
1986
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987extern void
1988file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1990extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
Andi Kleen9465efc2008-06-27 11:05:24 +02001991extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
1992 int origin);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993extern int generic_file_open(struct inode * inode, struct file * filp);
1994extern int nonseekable_open(struct inode * inode, struct file * filp);
1995
Carsten Otteceffc072005-06-23 22:05:25 -07001996#ifdef CONFIG_FS_XIP
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07001997extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1998 loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07001999extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07002000extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
2001 size_t len, loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07002002extern int xip_truncate_page(struct address_space *mapping, loff_t from);
Carsten Otte6d791252005-06-23 22:05:26 -07002003#else
2004static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
2005{
2006 return 0;
2007}
Carsten Otteceffc072005-06-23 22:05:25 -07002008#endif
2009
David Howells93614012006-09-30 20:45:40 +02002010#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
2012 struct block_device *bdev, const struct iovec *iov, loff_t offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002013 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 int lock_type);
2015
2016enum {
2017 DIO_LOCKING = 1, /* need locking between buffered and direct access */
2018 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
2019 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
2020};
2021
2022static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2023 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002024 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 dio_iodone_t end_io)
2026{
2027 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002028 nr_segs, get_block, end_io, DIO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029}
2030
2031static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
2032 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002033 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 dio_iodone_t end_io)
2035{
2036 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002037 nr_segs, get_block, end_io, DIO_NO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038}
2039
2040static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
2041 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002042 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 dio_iodone_t end_io)
2044{
2045 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08002046 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047}
David Howells93614012006-09-30 20:45:40 +02002048#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002050extern const struct file_operations generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051
2052#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2053
2054extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2055extern int vfs_follow_link(struct nameidata *, const char *);
2056extern int page_readlink(struct dentry *, char __user *, int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07002057extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2058extern void page_put_link(struct dentry *, struct nameidata *, void *);
Kirill Korotaev0adb25d2006-03-11 03:27:13 -08002059extern int __page_symlink(struct inode *inode, const char *symname, int len,
Nick Piggin54566b22009-01-04 12:00:53 -08002060 int nofs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061extern int page_symlink(struct inode *inode, const char *symname, int len);
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002062extern const struct inode_operations page_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063extern int generic_readlink(struct dentry *, char __user *, int);
2064extern void generic_fillattr(struct inode *, struct kstat *);
2065extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2066void inode_add_bytes(struct inode *inode, loff_t bytes);
2067void inode_sub_bytes(struct inode *inode, loff_t bytes);
2068loff_t inode_get_bytes(struct inode *inode);
2069void inode_set_bytes(struct inode *inode, loff_t bytes);
2070
2071extern int vfs_readdir(struct file *, filldir_t, void *);
2072
2073extern int vfs_stat(char __user *, struct kstat *);
2074extern int vfs_lstat(char __user *, struct kstat *);
Ulrich Drepper5590ff02006-01-18 17:43:53 -08002075extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
2076extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077extern int vfs_fstat(unsigned int, struct kstat *);
2078
Erez Zadokdeb21db2008-02-07 00:13:25 -08002079extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2080 unsigned long arg);
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002081extern int __generic_block_fiemap(struct inode *inode,
2082 struct fiemap_extent_info *fieinfo, u64 start,
2083 u64 len, get_block_t *get_block);
Josef Bacik68c9d702008-10-03 17:32:43 -04002084extern int generic_block_fiemap(struct inode *inode,
2085 struct fiemap_extent_info *fieinfo, u64 start,
2086 u64 len, get_block_t *get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087
Miklos Szeredic18479f2007-10-18 23:39:11 -07002088extern void get_filesystem(struct file_system_type *fs);
2089extern void put_filesystem(struct file_system_type *fs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090extern struct file_system_type *get_fs_type(const char *name);
2091extern struct super_block *get_super(struct block_device *);
2092extern struct super_block *user_get_super(dev_t);
2093extern void drop_super(struct super_block *sb);
2094
2095extern int dcache_dir_open(struct inode *, struct file *);
2096extern int dcache_dir_close(struct inode *, struct file *);
2097extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2098extern int dcache_readdir(struct file *, void *, filldir_t);
2099extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells726c3342006-06-23 02:02:58 -07002100extern int simple_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2102extern int simple_unlink(struct inode *, struct dentry *);
2103extern int simple_rmdir(struct inode *, struct dentry *);
2104extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2105extern int simple_sync_file(struct file *, struct dentry *, int);
2106extern int simple_empty(struct dentry *);
2107extern int simple_readpage(struct file *file, struct page *page);
2108extern int simple_prepare_write(struct file *file, struct page *page,
2109 unsigned offset, unsigned to);
Nick Pigginafddba42007-10-16 01:25:01 -07002110extern int simple_write_begin(struct file *file, struct address_space *mapping,
2111 loff_t pos, unsigned len, unsigned flags,
2112 struct page **pagep, void **fsdata);
2113extern int simple_write_end(struct file *file, struct address_space *mapping,
2114 loff_t pos, unsigned len, unsigned copied,
2115 struct page *page, void *fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116
2117extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
2118extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002119extern const struct file_operations simple_dir_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002120extern const struct inode_operations simple_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002121struct tree_descr { char *name; const struct file_operations *ops; int mode; };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122struct dentry *d_alloc_name(struct dentry *, const char *);
2123extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -04002124extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125extern void simple_release_fs(struct vfsmount **mount, int *count);
2126
Akinobu Mita93b07112008-06-05 22:46:21 -07002127extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2128 loff_t *ppos, const void *from, size_t available);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129
Christoph Lametere965f962006-02-01 03:05:41 -08002130#ifdef CONFIG_MIGRATION
Christoph Lameter2d1db3b2006-06-23 02:03:33 -07002131extern int buffer_migrate_page(struct address_space *,
2132 struct page *, struct page *);
Christoph Lametere965f962006-02-01 03:05:41 -08002133#else
2134#define buffer_migrate_page NULL
2135#endif
2136
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137extern int inode_change_ok(struct inode *, struct iattr *);
2138extern int __must_check inode_setattr(struct inode *, struct iattr *);
2139
Christoph Hellwig870f4812006-01-09 20:52:01 -08002140extern void file_update_time(struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141
Miklos Szeredib3b304a2008-02-08 04:21:35 -08002142extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2143extern void save_mount_options(struct super_block *sb, char *options);
2144
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145static inline ino_t parent_ino(struct dentry *dentry)
2146{
2147 ino_t res;
2148
2149 spin_lock(&dentry->d_lock);
2150 res = dentry->d_parent->d_inode->i_ino;
2151 spin_unlock(&dentry->d_lock);
2152 return res;
2153}
2154
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155/* Transaction based IO helpers */
2156
2157/*
2158 * An argresp is stored in an allocated page and holds the
2159 * size of the argument or response, along with its content
2160 */
2161struct simple_transaction_argresp {
2162 ssize_t size;
2163 char data[0];
2164};
2165
2166#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2167
2168char *simple_transaction_get(struct file *file, const char __user *buf,
2169 size_t size);
2170ssize_t simple_transaction_read(struct file *file, char __user *buf,
2171 size_t size, loff_t *pos);
2172int simple_transaction_release(struct inode *inode, struct file *file);
2173
2174static inline void simple_transaction_set(struct file *file, size_t n)
2175{
2176 struct simple_transaction_argresp *ar = file->private_data;
2177
2178 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
2179
2180 /*
2181 * The barrier ensures that ar->size will really remain zero until
2182 * ar->data is ready for reading.
2183 */
2184 smp_mb();
2185 ar->size = n;
2186}
2187
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002188/*
2189 * simple attribute files
2190 *
2191 * These attributes behave similar to those in sysfs:
2192 *
2193 * Writing to an attribute immediately sets a value, an open file can be
2194 * written to multiple times.
2195 *
2196 * Reading from an attribute creates a buffer from the value that might get
2197 * read with multiple read calls. When the attribute has been read
2198 * completely, no further read calls are possible until the file is opened
2199 * again.
2200 *
2201 * All attributes contain a text representation of a numeric value
2202 * that are accessed with the get() and set() functions.
2203 */
2204#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2205static int __fops ## _open(struct inode *inode, struct file *file) \
2206{ \
2207 __simple_attr_check_format(__fmt, 0ull); \
2208 return simple_attr_open(inode, file, __get, __set, __fmt); \
2209} \
2210static struct file_operations __fops = { \
2211 .owner = THIS_MODULE, \
2212 .open = __fops ## _open, \
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002213 .release = simple_attr_release, \
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002214 .read = simple_attr_read, \
2215 .write = simple_attr_write, \
2216};
2217
2218static inline void __attribute__((format(printf, 1, 2)))
2219__simple_attr_check_format(const char *fmt, ...)
2220{
2221 /* don't do anything, just let the compiler check the arguments; */
2222}
2223
2224int simple_attr_open(struct inode *inode, struct file *file,
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002225 int (*get)(void *, u64 *), int (*set)(void *, u64),
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002226 const char *fmt);
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002227int simple_attr_release(struct inode *inode, struct file *file);
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002228ssize_t simple_attr_read(struct file *file, char __user *buf,
2229 size_t len, loff_t *ppos);
2230ssize_t simple_attr_write(struct file *file, const char __user *buf,
2231 size_t len, loff_t *ppos);
2232
2233
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234#ifdef CONFIG_SECURITY
2235static inline char *alloc_secdata(void)
2236{
2237 return (char *)get_zeroed_page(GFP_KERNEL);
2238}
2239
2240static inline void free_secdata(void *secdata)
2241{
2242 free_page((unsigned long)secdata);
2243}
2244#else
2245static inline char *alloc_secdata(void)
2246{
2247 return (char *)1;
2248}
2249
2250static inline void free_secdata(void *secdata)
2251{ }
2252#endif /* CONFIG_SECURITY */
2253
Alexey Dobriyan4be28542007-10-16 23:26:21 -07002254struct ctl_table;
2255int proc_nr_files(struct ctl_table *table, int write, struct file *filp,
Adrian Bunk62239ac2007-07-17 04:03:45 -07002256 void __user *buffer, size_t *lenp, loff_t *ppos);
2257
Adrian Bunk011e3fc2008-02-06 01:36:47 -08002258int get_filesystem_list(char * buf);
Adrian Bunk62239ac2007-07-17 04:03:45 -07002259
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260#endif /* __KERNEL__ */
2261#endif /* _LINUX_FS_H */