fs.h 96.7 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10
#ifndef _LINUX_FS_H
#define _LINUX_FS_H

/*
 * This file has definitions for some important file table
 * structures etc.
 */

#include <linux/limits.h>
#include <linux/ioctl.h>
11
#include <linux/blk_types.h>
12
#include <linux/types.h>
L
Linus Torvalds 已提交
13 14 15 16 17 18 19 20 21 22 23 24 25

/*
 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
 * the file limit at runtime and only root can increase the per-process
 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
 * upper limit on files-per-process.
 *
 * Some programs (notably those using select()) may have to be 
 * recompiled to take full advantage of the new limits..  
 */

/* Fixed constants first: */
#undef NR_OPEN
26 27
#define INR_OPEN_CUR 1024	/* Initial setting for nfile rlimits */
#define INR_OPEN_MAX 4096	/* Hard limit for nfile rlimits */
L
Linus Torvalds 已提交
28 29 30 31

#define BLOCK_SIZE_BITS 10
#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)

32 33 34
#define SEEK_SET	0	/* seek relative to beginning of file */
#define SEEK_CUR	1	/* seek relative to current file position */
#define SEEK_END	2	/* seek relative to end of file */
35 36 37
#define SEEK_DATA	3	/* seek to the next data */
#define SEEK_HOLE	4	/* seek to the next hole */
#define SEEK_MAX	SEEK_HOLE
38

L
Lukas Czerner 已提交
39
struct fstrim_range {
40 41 42
	__u64 start;
	__u64 len;
	__u64 minlen;
L
Lukas Czerner 已提交
43 44
};

L
Linus Torvalds 已提交
45 46
/* And dynamically-tunable limits and defaults: */
struct files_stat_struct {
E
Eric Dumazet 已提交
47 48 49
	unsigned long nr_files;		/* read only */
	unsigned long nr_free_files;	/* read only */
	unsigned long max_files;		/* tunable */
L
Linus Torvalds 已提交
50 51 52 53 54
};

struct inodes_stat_t {
	int nr_inodes;
	int nr_unused;
55
	int dummy[5];		/* padding for sysctl ABI compatibility */
L
Linus Torvalds 已提交
56 57 58 59 60
};


#define NR_FILE  8192	/* this can well be larger on a larger system */

61 62 63 64 65 66 67 68 69
#define MAY_EXEC		0x00000001
#define MAY_WRITE		0x00000002
#define MAY_READ		0x00000004
#define MAY_APPEND		0x00000008
#define MAY_ACCESS		0x00000010
#define MAY_OPEN		0x00000020
#define MAY_CHDIR		0x00000040
/* called from RCU mode, don't block */
#define MAY_NOT_BLOCK		0x00000080
L
Linus Torvalds 已提交
70

71 72 73 74 75
/*
 * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
 */

76
/* file is open for reading */
77
#define FMODE_READ		((__force fmode_t)0x1)
78
/* file is open for writing */
79
#define FMODE_WRITE		((__force fmode_t)0x2)
80
/* file is seekable */
81
#define FMODE_LSEEK		((__force fmode_t)0x4)
82
/* file can be accessed using pread */
83
#define FMODE_PREAD		((__force fmode_t)0x8)
84
/* file can be accessed using pwrite */
85
#define FMODE_PWRITE		((__force fmode_t)0x10)
86
/* File is opened for execution with sys_execve / sys_uselib */
87
#define FMODE_EXEC		((__force fmode_t)0x20)
88
/* File is opened with O_NDELAY (only set for block devices) */
89
#define FMODE_NDELAY		((__force fmode_t)0x40)
90
/* File is opened with O_EXCL (only set for block devices) */
91
#define FMODE_EXCL		((__force fmode_t)0x80)
92 93
/* File is opened using open(.., 3, ..) and is writeable only for ioctls
   (specialy hack for floppy.c) */
94
#define FMODE_WRITE_IOCTL	((__force fmode_t)0x100)
95 96 97 98
/* 32bit hashes as llseek() offset (for directories) */
#define FMODE_32BITHASH         ((__force fmode_t)0x200)
/* 64bit hashes as llseek() offset (for directories) */
#define FMODE_64BITHASH         ((__force fmode_t)0x400)
99

100 101 102 103 104 105
/*
 * Don't update ctime and mtime.
 *
 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
 */
106
#define FMODE_NOCMTIME		((__force fmode_t)0x800)
107

108
/* Expect random access pattern */
109
#define FMODE_RANDOM		((__force fmode_t)0x1000)
110

111 112 113
/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
#define FMODE_UNSIGNED_OFFSET	((__force fmode_t)0x2000)

114 115 116
/* File is opened with O_PATH; almost nothing can be done with it */
#define FMODE_PATH		((__force fmode_t)0x4000)

E
Eric Paris 已提交
117
/* File was opened by fanotify and shouldn't generate fanotify events */
118
#define FMODE_NONOTIFY		((__force fmode_t)0x1000000)
E
Eric Paris 已提交
119

120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
/*
 * The below are the various read and write types that we support. Some of
 * them include behavioral modifiers that send information down to the
 * block layer and IO scheduler. Terminology:
 *
 *	The block layer uses device plugging to defer IO a little bit, in
 *	the hope that we will see more IO very shortly. This increases
 *	coalescing of adjacent IO and thus reduces the number of IOs we
 *	have to send to the device. It also allows for better queuing,
 *	if the IO isn't mergeable. If the caller is going to be waiting
 *	for the IO, then he must ensure that the device is unplugged so
 *	that the IO is dispatched to the driver.
 *
 *	All IO is handled async in Linux. This is fine for background
 *	writes, but for reads or writes that someone waits for completion
 *	on, we want to notify the block layer and IO scheduler so that they
 *	know about it. That allows them to make better scheduling
 *	decisions. So when the below references 'sync' and 'async', it
 *	is referencing this priority hint.
 *
 * With that in mind, the available types are:
 *
 * READ			A normal read operation. Device will be plugged.
 * READ_SYNC		A synchronous read. Device is not plugged, caller can
 *			immediately wait on this read without caring about
 *			unplugging.
 * READA		Used for read-ahead operations. Lower priority, and the
147
 *			block layer could (in theory) choose to ignore this
148 149
 *			request if it runs into resource problems.
 * WRITE		A normal async write. Device will be plugged.
J
Jens Axboe 已提交
150
 * WRITE_SYNC		Synchronous write. Identical to WRITE, but passes down
151
 *			the hint that someone will be waiting on this IO
J
Jens Axboe 已提交
152 153
 *			shortly. The write equivalent of READ_SYNC.
 * WRITE_ODIRECT	Special case write for O_DIRECT only.
154 155 156 157 158 159
 * WRITE_FLUSH		Like WRITE_SYNC but with preceding cache flush.
 * WRITE_FUA		Like WRITE_SYNC but data is guaranteed to be on
 *			non-volatile media on completion.
 * WRITE_FLUSH_FUA	Combination of WRITE_FLUSH and FUA. The IO is preceded
 *			by a cache flush and data is guaranteed to be on
 *			non-volatile media on completion.
160 161
 *
 */
162 163
#define RW_MASK			REQ_WRITE
#define RWA_MASK		REQ_RAHEAD
164 165

#define READ			0
166 167
#define WRITE			RW_MASK
#define READA			RWA_MASK
168 169
#define KERNEL_READ		(READ|REQ_KERNEL)
#define KERNEL_WRITE		(WRITE|REQ_KERNEL)
170

J
Jens Axboe 已提交
171 172 173 174 175 176
#define READ_SYNC		(READ | REQ_SYNC)
#define WRITE_SYNC		(WRITE | REQ_SYNC | REQ_NOIDLE)
#define WRITE_ODIRECT		(WRITE | REQ_SYNC)
#define WRITE_FLUSH		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
#define WRITE_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
#define WRITE_FLUSH_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
L
Linus Torvalds 已提交
177

178 179 180 181 182 183 184 185 186

/*
 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
 * that indicates that they should check the contents of the iovec are
 * valid, but not check the memory that the iovec elements
 * points too.
 */
#define CHECK_IOVEC_ONLY -1

L
Linus Torvalds 已提交
187 188 189 190 191 192 193
#define SEL_IN		1
#define SEL_OUT		2
#define SEL_EX		4

/* public flags for file_system_type */
#define FS_REQUIRES_DEV 1 
#define FS_BINARY_MOUNTDATA 2
M
Miklos Szeredi 已提交
194
#define FS_HAS_SUBTYPE 4
L
Linus Torvalds 已提交
195
#define FS_REVAL_DOT	16384	/* Check the paths ".", ".." for staleness */
196 197 198 199
#define FS_RENAME_DOES_D_MOVE	32768	/* FS will handle d_move()
					 * during rename() internally.
					 */

L
Linus Torvalds 已提交
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
/*
 * These are the fs-independent mount-flags: up to 32 flags are supported
 */
#define MS_RDONLY	 1	/* Mount read-only */
#define MS_NOSUID	 2	/* Ignore suid and sgid bits */
#define MS_NODEV	 4	/* Disallow access to device special files */
#define MS_NOEXEC	 8	/* Disallow program execution */
#define MS_SYNCHRONOUS	16	/* Writes are synced at once */
#define MS_REMOUNT	32	/* Alter flags of a mounted FS */
#define MS_MANDLOCK	64	/* Allow mandatory locks on an FS */
#define MS_DIRSYNC	128	/* Directory modifications are synchronous */
#define MS_NOATIME	1024	/* Do not update access times. */
#define MS_NODIRATIME	2048	/* Do not update directory access times */
#define MS_BIND		4096
#define MS_MOVE		8192
#define MS_REC		16384
216 217 218
#define MS_VERBOSE	32768	/* War is peace. Verbosity is silence.
				   MS_VERBOSE is deprecated. */
#define MS_SILENT	32768
M
Miklos Szeredi 已提交
219
#define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */
R
Ram Pai 已提交
220
#define MS_UNBINDABLE	(1<<17)	/* change to unbindable */
221
#define MS_PRIVATE	(1<<18)	/* change to private */
R
Ram Pai 已提交
222
#define MS_SLAVE	(1<<19)	/* change to slave */
R
Ram Pai 已提交
223
#define MS_SHARED	(1<<20)	/* change to shared */
V
Valerie Henson 已提交
224
#define MS_RELATIME	(1<<21)	/* Update atime relative to mtime/ctime. */
225
#define MS_KERNMOUNT	(1<<22) /* this is a kern_mount call */
226
#define MS_I_VERSION	(1<<23) /* Update inode I_version field */
M
Matthew Garrett 已提交
227
#define MS_STRICTATIME	(1<<24) /* Always perform atime updates */
A
Al Viro 已提交
228
#define MS_NOSEC	(1<<28)
A
Al Viro 已提交
229
#define MS_BORN		(1<<29)
L
Linus Torvalds 已提交
230 231 232 233 234 235
#define MS_ACTIVE	(1<<30)
#define MS_NOUSER	(1<<31)

/*
 * Superblock flags that can be altered by MS_REMOUNT
 */
M
Mimi Zohar 已提交
236
#define MS_RMT_MASK	(MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
L
Linus Torvalds 已提交
237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255

/*
 * Old magic mount flag and mask
 */
#define MS_MGC_VAL 0xC0ED0000
#define MS_MGC_MSK 0xffff0000

/* Inode flags - they have nothing to superblock flags now */

#define S_SYNC		1	/* Writes are synced at once */
#define S_NOATIME	2	/* Do not update access times */
#define S_APPEND	4	/* Append-only file */
#define S_IMMUTABLE	8	/* Immutable file */
#define S_DEAD		16	/* removed, but still open directory */
#define S_NOQUOTA	32	/* Inode is not counted to quota */
#define S_DIRSYNC	64	/* Directory modifications are synchronous */
#define S_NOCMTIME	128	/* Do not update file c/mtime */
#define S_SWAPFILE	256	/* Do not truncate: swapon got its bmaps */
#define S_PRIVATE	512	/* Inode is fs-internal */
256
#define S_IMA		1024	/* Inode has an associated IMA struct */
257
#define S_AUTOMOUNT	2048	/* Automount/referral quasi-directory */
258
#define S_NOSEC		4096	/* no suid or xattr security attributes */
L
Linus Torvalds 已提交
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280

/*
 * Note that nosuid etc flags are inode-specific: setting some file-system
 * flags just means all the inodes inherit those flags by default. It might be
 * possible to override it selectively if you really wanted to with some
 * ioctl() that is not currently implemented.
 *
 * Exception: MS_RDONLY is always applied to the entire file system.
 *
 * Unfortunately, it is possible to change a filesystems flags with it mounted
 * with files in use.  This means that all of the inodes will not have their
 * i_flags updated.  Hence, i_flags no longer inherit the superblock mount
 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
 */
#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))

#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
#define IS_SYNC(inode)		(__IS_FLG(inode, MS_SYNCHRONOUS) || \
					((inode)->i_flags & S_SYNC))
#define IS_DIRSYNC(inode)	(__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
					((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
#define IS_MANDLOCK(inode)	__IS_FLG(inode, MS_MANDLOCK)
281
#define IS_NOATIME(inode)   __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
282
#define IS_I_VERSION(inode)   __IS_FLG(inode, MS_I_VERSION)
L
Linus Torvalds 已提交
283 284 285 286 287 288 289 290 291 292

#define IS_NOQUOTA(inode)	((inode)->i_flags & S_NOQUOTA)
#define IS_APPEND(inode)	((inode)->i_flags & S_APPEND)
#define IS_IMMUTABLE(inode)	((inode)->i_flags & S_IMMUTABLE)
#define IS_POSIXACL(inode)	__IS_FLG(inode, MS_POSIXACL)

#define IS_DEADDIR(inode)	((inode)->i_flags & S_DEAD)
#define IS_NOCMTIME(inode)	((inode)->i_flags & S_NOCMTIME)
#define IS_SWAPFILE(inode)	((inode)->i_flags & S_SWAPFILE)
#define IS_PRIVATE(inode)	((inode)->i_flags & S_PRIVATE)
293
#define IS_IMA(inode)		((inode)->i_flags & S_IMA)
294
#define IS_AUTOMOUNT(inode)	((inode)->i_flags & S_AUTOMOUNT)
295
#define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
L
Linus Torvalds 已提交
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325

/* the read-only stuff doesn't really belong here, but any other place is
   probably as bad and I don't want to create yet another include file. */

#define BLKROSET   _IO(0x12,93)	/* set device read-only (0 = read-write) */
#define BLKROGET   _IO(0x12,94)	/* get read-only status (0 = read_write) */
#define BLKRRPART  _IO(0x12,95)	/* re-read partition table */
#define BLKGETSIZE _IO(0x12,96)	/* return device size /512 (long *arg) */
#define BLKFLSBUF  _IO(0x12,97)	/* flush buffer cache */
#define BLKRASET   _IO(0x12,98)	/* set read ahead for block device */
#define BLKRAGET   _IO(0x12,99)	/* get current read ahead setting */
#define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
#define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
#define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
#if 0
#define BLKPG      _IO(0x12,105)/* See blkpg.h */

/* Some people are morons.  Do not use sizeof! */

#define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */
#define BLKELVSET  _IOW(0x12,107,size_t)/* elevator set */
/* This was here just to show that the number is taken -
   probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
#endif
/* A jump here: 108-111 have been used for various private purposes. */
#define BLKBSZGET  _IOR(0x12,112,size_t)
#define BLKBSZSET  _IOW(0x12,113,size_t)
#define BLKGETSIZE64 _IOR(0x12,114,size_t)	/* return device size in bytes (u64 *arg) */
326 327 328 329
#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
#define BLKTRACESTART _IO(0x12,116)
#define BLKTRACESTOP _IO(0x12,117)
#define BLKTRACETEARDOWN _IO(0x12,118)
330
#define BLKDISCARD _IO(0x12,119)
M
Martin K. Petersen 已提交
331 332 333 334
#define BLKIOMIN _IO(0x12,120)
#define BLKIOOPT _IO(0x12,121)
#define BLKALIGNOFF _IO(0x12,122)
#define BLKPBSZGET _IO(0x12,123)
335
#define BLKDISCARDZEROES _IO(0x12,124)
A
Adrian Hunter 已提交
336
#define BLKSECDISCARD _IO(0x12,125)
337
#define BLKROTATIONAL _IO(0x12,126)
338
#define BLKZEROOUT _IO(0x12,127)
L
Linus Torvalds 已提交
339 340 341 342

#define BMAP_IOCTL 1		/* obsolete - kept for compatibility */
#define FIBMAP	   _IO(0x00,1)	/* bmap access */
#define FIGETBSZ   _IO(0x00,2)	/* get the block size used for bmap */
343 344
#define FIFREEZE	_IOWR('X', 119, int)	/* Freeze */
#define FITHAW		_IOWR('X', 120, int)	/* Thaw */
L
Lukas Czerner 已提交
345
#define FITRIM		_IOWR('X', 121, struct fstrim_range)	/* Trim */
L
Linus Torvalds 已提交
346

347 348 349 350
#define	FS_IOC_GETFLAGS			_IOR('f', 1, long)
#define	FS_IOC_SETFLAGS			_IOW('f', 2, long)
#define	FS_IOC_GETVERSION		_IOR('v', 1, long)
#define	FS_IOC_SETVERSION		_IOW('v', 2, long)
M
Mark Fasheh 已提交
351
#define FS_IOC_FIEMAP			_IOWR('f', 11, struct fiemap)
352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
#define FS_IOC32_GETFLAGS		_IOR('f', 1, int)
#define FS_IOC32_SETFLAGS		_IOW('f', 2, int)
#define FS_IOC32_GETVERSION		_IOR('v', 1, int)
#define FS_IOC32_SETVERSION		_IOW('v', 2, int)

/*
 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
 */
#define	FS_SECRM_FL			0x00000001 /* Secure deletion */
#define	FS_UNRM_FL			0x00000002 /* Undelete */
#define	FS_COMPR_FL			0x00000004 /* Compress file */
#define FS_SYNC_FL			0x00000008 /* Synchronous updates */
#define FS_IMMUTABLE_FL			0x00000010 /* Immutable file */
#define FS_APPEND_FL			0x00000020 /* writes to file may only append */
#define FS_NODUMP_FL			0x00000040 /* do not dump file */
#define FS_NOATIME_FL			0x00000080 /* do not update atime */
/* Reserved for compression usage... */
#define FS_DIRTY_FL			0x00000100
#define FS_COMPRBLK_FL			0x00000200 /* One or more compressed clusters */
#define FS_NOCOMP_FL			0x00000400 /* Don't compress */
#define FS_ECOMPR_FL			0x00000800 /* Compression error */
/* End compression flags --- maybe not all used */
#define FS_BTREE_FL			0x00001000 /* btree format dir */
#define FS_INDEX_FL			0x00001000 /* hash-indexed directory */
#define FS_IMAGIC_FL			0x00002000 /* AFS directory */
#define FS_JOURNAL_DATA_FL		0x00004000 /* Reserved for ext3 */
#define FS_NOTAIL_FL			0x00008000 /* file tail should not be merged */
#define FS_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
#define FS_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
381 382
#define FS_EXTENT_FL			0x00080000 /* Extents */
#define FS_DIRECTIO_FL			0x00100000 /* Use direct i/o */
L
liubo 已提交
383
#define FS_NOCOW_FL			0x00800000 /* Do not cow file */
384 385 386 387 388 389
#define FS_RESERVED_FL			0x80000000 /* reserved for ext2 lib */

#define FS_FL_USER_VISIBLE		0x0003DFFF /* User visible flags */
#define FS_FL_USER_MODIFIABLE		0x000380FF /* User modifiable flags */


390 391 392 393
#define SYNC_FILE_RANGE_WAIT_BEFORE	1
#define SYNC_FILE_RANGE_WRITE		2
#define SYNC_FILE_RANGE_WAIT_AFTER	4

L
Linus Torvalds 已提交
394 395 396 397 398 399
#ifdef __KERNEL__

#include <linux/linkage.h>
#include <linux/wait.h>
#include <linux/kdev_t.h>
#include <linux/dcache.h>
400
#include <linux/path.h>
L
Linus Torvalds 已提交
401 402 403 404
#include <linux/stat.h>
#include <linux/cache.h>
#include <linux/list.h>
#include <linux/radix-tree.h>
405
#include <linux/rbtree.h>
L
Linus Torvalds 已提交
406
#include <linux/init.h>
407
#include <linux/pid.h>
408
#include <linux/bug.h>
409
#include <linux/mutex.h>
410
#include <linux/capability.h>
411
#include <linux/semaphore.h>
M
Mark Fasheh 已提交
412
#include <linux/fiemap.h>
413
#include <linux/rculist_bl.h>
414
#include <linux/atomic.h>
415
#include <linux/shrinker.h>
416
#include <linux/migrate_mode.h>
417
#include <linux/uidgid.h>
418
#include <linux/lockdep.h>
419
#include <linux/percpu-rwsem.h>
L
Linus Torvalds 已提交
420 421 422

#include <asm/byteorder.h>

423
struct export_operations;
424
struct hd_geometry;
L
Linus Torvalds 已提交
425 426
struct iovec;
struct nameidata;
427
struct kiocb;
A
Alexey Dobriyan 已提交
428
struct kobject;
L
Linus Torvalds 已提交
429 430 431 432 433
struct pipe_inode_info;
struct poll_table_struct;
struct kstatfs;
struct vm_area_struct;
struct vfsmount;
434
struct cred;
435
struct swap_info_struct;
L
Linus Torvalds 已提交
436

437
extern void __init inode_init(void);
L
Linus Torvalds 已提交
438 439 440
extern void __init inode_init_early(void);
extern void __init files_init(unsigned long);

441
extern struct files_stat_struct files_stat;
E
Eric Dumazet 已提交
442
extern unsigned long get_max_files(void);
443 444 445
extern int sysctl_nr_open;
extern struct inodes_stat_t inodes_stat;
extern int leases_enable, lease_break_time;
K
Kees Cook 已提交
446 447
extern int sysctl_protected_symlinks;
extern int sysctl_protected_hardlinks;
448

L
Linus Torvalds 已提交
449 450 451
struct buffer_head;
typedef int (get_block_t)(struct inode *inode, sector_t iblock,
			struct buffer_head *bh_result, int create);
452
typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
453 454
			ssize_t bytes, void *private, int ret,
			bool is_async);
L
Linus Torvalds 已提交
455 456 457 458 459

/*
 * Attribute flags.  These should be or-ed together to figure out what
 * has been changed!
 */
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
#define ATTR_MODE	(1 << 0)
#define ATTR_UID	(1 << 1)
#define ATTR_GID	(1 << 2)
#define ATTR_SIZE	(1 << 3)
#define ATTR_ATIME	(1 << 4)
#define ATTR_MTIME	(1 << 5)
#define ATTR_CTIME	(1 << 6)
#define ATTR_ATIME_SET	(1 << 7)
#define ATTR_MTIME_SET	(1 << 8)
#define ATTR_FORCE	(1 << 9) /* Not a change, but a change it */
#define ATTR_ATTR_FLAG	(1 << 10)
#define ATTR_KILL_SUID	(1 << 11)
#define ATTR_KILL_SGID	(1 << 12)
#define ATTR_FILE	(1 << 13)
#define ATTR_KILL_PRIV	(1 << 14)
#define ATTR_OPEN	(1 << 15) /* Truncating from open(O_TRUNC) */
#define ATTR_TIMES_SET	(1 << 16)
L
Linus Torvalds 已提交
477 478 479 480 481 482 483 484 485 486 487 488 489

/*
 * This is the Inode Attributes structure, used for notify_change().  It
 * uses the above definitions as flags, to know which values have changed.
 * Also, in this manner, a Filesystem can look at only the values it cares
 * about.  Basically, these are the attributes that the VFS layer can
 * request to change from the FS layer.
 *
 * Derek Atkins <warlord@MIT.EDU> 94-10-20
 */
struct iattr {
	unsigned int	ia_valid;
	umode_t		ia_mode;
490 491
	kuid_t		ia_uid;
	kgid_t		ia_gid;
L
Linus Torvalds 已提交
492 493 494 495
	loff_t		ia_size;
	struct timespec	ia_atime;
	struct timespec	ia_mtime;
	struct timespec	ia_ctime;
496 497

	/*
L
Lucas De Marchi 已提交
498
	 * Not an attribute, but an auxiliary info for filesystems wanting to
499 500 501 502
	 * implement an ftruncate() like method.  NOTE: filesystem should
	 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
	 */
	struct file	*ia_file;
L
Linus Torvalds 已提交
503 504 505 506 507 508 509
};

/*
 * Includes for diskquotas.
 */
#include <linux/quota.h>

510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527
/** 
 * enum positive_aop_returns - aop return codes with specific semantics
 *
 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
 * 			    completed, that the page is still locked, and
 * 			    should be considered active.  The VM uses this hint
 * 			    to return the page to the active list -- it won't
 * 			    be a candidate for writeback again in the near
 * 			    future.  Other callers must be careful to unlock
 * 			    the page if they get this return.  Returned by
 * 			    writepage(); 
 *
 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
 *  			unlocked it and the page might have been truncated.
 *  			The caller should back up to acquiring a new page and
 *  			trying again.  The aop will be taking reasonable
 *  			precautions not to livelock.  If the caller held a page
 *  			reference, it should drop it before retrying.  Returned
N
Nick Piggin 已提交
528
 *  			by readpage().
529 530 531 532 533 534 535 536 537 538 539 540
 *
 * address_space_operation functions return these large constants to indicate
 * special semantics to the caller.  These are much larger than the bytes in a
 * page to allow for functions that return the number of bytes operated on in a
 * given page.
 */

enum positive_aop_returns {
	AOP_WRITEPAGE_ACTIVATE	= 0x80000,
	AOP_TRUNCATED_PAGE	= 0x80001,
};

541
#define AOP_FLAG_UNINTERRUPTIBLE	0x0001 /* will not do a short write */
N
Nick Piggin 已提交
542
#define AOP_FLAG_CONT_EXPAND		0x0002 /* called from cont_expand */
543 544 545
#define AOP_FLAG_NOFS			0x0004 /* used by filesystem to direct
						* helper code (eg buffer layer)
						* to clear GFP_FS from alloc */
546

L
Linus Torvalds 已提交
547 548 549 550 551 552 553
/*
 * oh the beauties of C type declarations.
 */
struct page;
struct address_space;
struct writeback_control;

N
Nick Piggin 已提交
554 555 556 557 558 559 560 561 562 563 564 565
struct iov_iter {
	const struct iovec *iov;
	unsigned long nr_segs;
	size_t iov_offset;
	size_t count;
};

size_t iov_iter_copy_from_user_atomic(struct page *page,
		struct iov_iter *i, unsigned long offset, size_t bytes);
size_t iov_iter_copy_from_user(struct page *page,
		struct iov_iter *i, unsigned long offset, size_t bytes);
void iov_iter_advance(struct iov_iter *i, size_t bytes);
566
int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
N
Nick Piggin 已提交
567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585
size_t iov_iter_single_seg_count(struct iov_iter *i);

static inline void iov_iter_init(struct iov_iter *i,
			const struct iovec *iov, unsigned long nr_segs,
			size_t count, size_t written)
{
	i->iov = iov;
	i->nr_segs = nr_segs;
	i->iov_offset = 0;
	i->count = count + written;

	iov_iter_advance(i, written);
}

static inline size_t iov_iter_count(struct iov_iter *i)
{
	return i->count;
}

586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
/*
 * "descriptor" for what we're up to with a read.
 * This allows us to use the same read code yet
 * have multiple different users of the data that
 * we read from a file.
 *
 * The simplest case just copies the data to user
 * mode.
 */
typedef struct {
	size_t written;
	size_t count;
	union {
		char __user *buf;
		void *data;
	} arg;
	int error;
} read_descriptor_t;

typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
		unsigned long, unsigned long);
N
Nick Piggin 已提交
607

L
Linus Torvalds 已提交
608 609 610 611 612 613 614
struct address_space_operations {
	int (*writepage)(struct page *page, struct writeback_control *wbc);
	int (*readpage)(struct file *, struct page *);

	/* Write back some dirty pages from this mapping. */
	int (*writepages)(struct address_space *, struct writeback_control *);

615
	/* Set a page dirty.  Return true if this dirtied it */
L
Linus Torvalds 已提交
616 617 618 619 620
	int (*set_page_dirty)(struct page *page);

	int (*readpages)(struct file *filp, struct address_space *mapping,
			struct list_head *pages, unsigned nr_pages);

621 622 623 624 625 626 627
	int (*write_begin)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);
	int (*write_end)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

L
Linus Torvalds 已提交
628 629
	/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
	sector_t (*bmap)(struct address_space *, sector_t);
630
	void (*invalidatepage) (struct page *, unsigned long);
A
Al Viro 已提交
631
	int (*releasepage) (struct page *, gfp_t);
632
	void (*freepage)(struct page *);
L
Linus Torvalds 已提交
633 634
	ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
			loff_t offset, unsigned long nr_segs);
635 636
	int (*get_xip_mem)(struct address_space *, pgoff_t, int,
						void **, unsigned long *);
637 638 639 640
	/*
	 * migrate the contents of a page to the specified target. If sync
	 * is false, it must not block.
	 */
641
	int (*migratepage) (struct address_space *,
642
			struct page *, struct page *, enum migrate_mode);
643
	int (*launder_page) (struct page *);
644 645
	int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
					unsigned long);
646
	int (*error_remove_page)(struct address_space *, struct page *);
647 648

	/* swapfile support */
649 650 651
	int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
				sector_t *span);
	void (*swap_deactivate)(struct file *file);
L
Linus Torvalds 已提交
652 653
};

J
Jens Axboe 已提交
654 655
extern const struct address_space_operations empty_aops;

656 657 658 659 660 661 662 663 664 665 666 667
/*
 * pagecache_write_begin/pagecache_write_end must be used by general code
 * to write into the pagecache.
 */
int pagecache_write_begin(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);

int pagecache_write_end(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

L
Linus Torvalds 已提交
668 669 670 671
struct backing_dev_info;
struct address_space {
	struct inode		*host;		/* owner: inode, block_device */
	struct radix_tree_root	page_tree;	/* radix tree of all pages */
N
Nick Piggin 已提交
672
	spinlock_t		tree_lock;	/* and lock protecting it */
L
Linus Torvalds 已提交
673
	unsigned int		i_mmap_writable;/* count VM_SHARED mappings */
674
	struct rb_root		i_mmap;		/* tree of private and shared mappings */
L
Linus Torvalds 已提交
675
	struct list_head	i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
676
	struct mutex		i_mmap_mutex;	/* protect tree, count, list */
677
	/* Protected by tree_lock together with the radix tree */
L
Linus Torvalds 已提交
678 679
	unsigned long		nrpages;	/* number of total pages */
	pgoff_t			writeback_index;/* writeback starts here */
680
	const struct address_space_operations *a_ops;	/* methods */
L
Linus Torvalds 已提交
681 682 683 684 685 686 687 688
	unsigned long		flags;		/* error bits/gfp mask */
	struct backing_dev_info *backing_dev_info; /* device readahead, etc */
	spinlock_t		private_lock;	/* for use by the address_space */
	struct list_head	private_list;	/* ditto */
	struct address_space	*assoc_mapping;	/* ditto */
} __attribute__((aligned(sizeof(long))));
	/*
	 * On most architectures that alignment is already the case; but
L
Lucas De Marchi 已提交
689
	 * must be enforced here for CRIS, to let the least significant bit
L
Linus Torvalds 已提交
690 691
	 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
	 */
692
struct request_queue;
L
Linus Torvalds 已提交
693 694 695

struct block_device {
	dev_t			bd_dev;  /* not a kdev_t - it's a search key */
696
	int			bd_openers;
L
Linus Torvalds 已提交
697
	struct inode *		bd_inode;	/* will die */
698
	struct super_block *	bd_super;
699
	struct mutex		bd_mutex;	/* open/close mutex */
L
Linus Torvalds 已提交
700
	struct list_head	bd_inodes;
701
	void *			bd_claiming;
L
Linus Torvalds 已提交
702 703
	void *			bd_holder;
	int			bd_holders;
704
	bool			bd_write_holder;
705
#ifdef CONFIG_SYSFS
706
	struct list_head	bd_holder_disks;
707
#endif
L
Linus Torvalds 已提交
708 709 710 711 712 713 714
	struct block_device *	bd_contains;
	unsigned		bd_block_size;
	struct hd_struct *	bd_part;
	/* number of times partitions within this device have been opened. */
	unsigned		bd_part_count;
	int			bd_invalidated;
	struct gendisk *	bd_disk;
715
	struct request_queue *  bd_queue;
L
Linus Torvalds 已提交
716 717 718 719 720 721 722 723
	struct list_head	bd_list;
	/*
	 * Private data.  You must have bd_claim'ed the block_device
	 * to use this.  NOTE:  bd_claim allows an owner to claim
	 * the same device multiple times, the owner must take special
	 * care to not mess up bd_private for that case.
	 */
	unsigned long		bd_private;
724 725 726 727 728

	/* The counter of freeze processes */
	int			bd_fsfreeze_count;
	/* Mutex for freeze */
	struct mutex		bd_fsfreeze_mutex;
729
	/* A semaphore that prevents I/O while block size is being changed */
730
	struct percpu_rw_semaphore	bd_block_size_semaphore;
L
Linus Torvalds 已提交
731 732 733 734 735 736 737 738
};

/*
 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
 * radix trees
 */
#define PAGECACHE_TAG_DIRTY	0
#define PAGECACHE_TAG_WRITEBACK	1
739
#define PAGECACHE_TAG_TOWRITE	2
L
Linus Torvalds 已提交
740 741 742 743 744 745 746 747

int mapping_tagged(struct address_space *mapping, int tag);

/*
 * Might pages of this file be mapped into userspace?
 */
static inline int mapping_mapped(struct address_space *mapping)
{
748
	return	!RB_EMPTY_ROOT(&mapping->i_mmap) ||
L
Linus Torvalds 已提交
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
		!list_empty(&mapping->i_mmap_nonlinear);
}

/*
 * Might pages of this file have been modified in userspace?
 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
 * marks vma as VM_SHARED if it is shared, and the file was opened for
 * writing i.e. vma may be mprotected writable even if now readonly.
 */
static inline int mapping_writably_mapped(struct address_space *mapping)
{
	return mapping->i_mmap_writable != 0;
}

/*
 * Use sequence counter to get consistent i_size on 32-bit processors.
 */
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
#include <linux/seqlock.h>
#define __NEED_I_SIZE_ORDERED
#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
#else
#define i_size_ordered_init(inode) do { } while (0)
#endif

A
Al Viro 已提交
774 775 776
struct posix_acl;
#define ACL_NOT_CACHED ((void *)(-1))

777 778 779 780 781 782 783 784 785
#define IOP_FASTPERM	0x0001
#define IOP_LOOKUP	0x0002
#define IOP_NOFOLLOW	0x0004

/*
 * Keep mostly read-only and often accessed (especially for
 * the RCU path lookup and 'stat' data) fields at the beginning
 * of the 'struct inode'
 */
L
Linus Torvalds 已提交
786
struct inode {
787
	umode_t			i_mode;
788
	unsigned short		i_opflags;
789 790
	kuid_t			i_uid;
	kgid_t			i_gid;
791 792 793 794 795 796 797
	unsigned int		i_flags;

#ifdef CONFIG_FS_POSIX_ACL
	struct posix_acl	*i_acl;
	struct posix_acl	*i_default_acl;
#endif

798 799
	const struct inode_operations	*i_op;
	struct super_block	*i_sb;
800
	struct address_space	*i_mapping;
801

802 803 804
#ifdef CONFIG_SECURITY
	void			*i_security;
#endif
805

806 807
	/* Stat data, not accessed from path walking */
	unsigned long		i_ino;
M
Miklos Szeredi 已提交
808 809 810 811 812 813 814 815 816 817 818
	/*
	 * Filesystems may only read i_nlink directly.  They shall use the
	 * following functions for modification:
	 *
	 *    (set|clear|inc|drop)_nlink
	 *    inode_(inc|dec)_link_count
	 */
	union {
		const unsigned int i_nlink;
		unsigned int __i_nlink;
	};
819
	dev_t			i_rdev;
820
	loff_t			i_size;
821 822 823
	struct timespec		i_atime;
	struct timespec		i_mtime;
	struct timespec		i_ctime;
824 825
	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
	unsigned short          i_bytes;
826
	unsigned int		i_blkbits;
827 828 829 830 831 832 833 834 835
	blkcnt_t		i_blocks;

#ifdef __NEED_I_SIZE_ORDERED
	seqcount_t		i_size_seqcount;
#endif

	/* Misc */
	unsigned long		i_state;
	struct mutex		i_mutex;
836

837 838
	unsigned long		dirtied_when;	/* jiffies of first dirtying */

L
Linus Torvalds 已提交
839
	struct hlist_node	i_hash;
N
Nick Piggin 已提交
840 841
	struct list_head	i_wb_list;	/* backing dev IO list */
	struct list_head	i_lru;		/* inode LRU list */
L
Linus Torvalds 已提交
842
	struct list_head	i_sb_list;
N
Nick Piggin 已提交
843
	union {
A
Al Viro 已提交
844
		struct hlist_head	i_dentry;
N
Nick Piggin 已提交
845 846
		struct rcu_head		i_rcu;
	};
847
	u64			i_version;
848
	atomic_t		i_count;
C
Christoph Hellwig 已提交
849
	atomic_t		i_dio_count;
850
	atomic_t		i_writecount;
851
	const struct file_operations	*i_fop;	/* former ->i_op->default_file_ops */
L
Linus Torvalds 已提交
852 853 854 855 856 857
	struct file_lock	*i_flock;
	struct address_space	i_data;
#ifdef CONFIG_QUOTA
	struct dquot		*i_dquot[MAXQUOTAS];
#endif
	struct list_head	i_devices;
858 859
	union {
		struct pipe_inode_info	*i_pipe;
860
		struct block_device	*i_bdev;
861
		struct cdev		*i_cdev;
862
	};
L
Linus Torvalds 已提交
863 864 865

	__u32			i_generation;

866 867
#ifdef CONFIG_FSNOTIFY
	__u32			i_fsnotify_mask; /* all events this inode cares about */
868
	struct hlist_head	i_fsnotify_marks;
R
Robert Love 已提交
869 870
#endif

871
#ifdef CONFIG_IMA
M
Mimi Zohar 已提交
872
	atomic_t		i_readcount; /* struct files open RO */
873
#endif
874
	void			*i_private; /* fs or device private pointer */
L
Linus Torvalds 已提交
875 876
};

A
Al Viro 已提交
877 878 879 880 881
static inline int inode_unhashed(struct inode *inode)
{
	return hlist_unhashed(&inode->i_hash);
}

I
Ingo Molnar 已提交
882 883 884 885 886 887 888 889 890
/*
 * inode->i_mutex nesting subclasses for the lock validator:
 *
 * 0: the object of the current VFS operation
 * 1: parent
 * 2: child/target
 * 3: quota file
 *
 * The locking order between these classes is
I
Ingo Molnar 已提交
891
 * parent -> child -> normal -> xattr -> quota
I
Ingo Molnar 已提交
892 893 894 895 896 897
 */
enum inode_i_mutex_lock_class
{
	I_MUTEX_NORMAL,
	I_MUTEX_PARENT,
	I_MUTEX_CHILD,
I
Ingo Molnar 已提交
898
	I_MUTEX_XATTR,
I
Ingo Molnar 已提交
899 900 901
	I_MUTEX_QUOTA
};

L
Linus Torvalds 已提交
902 903 904 905 906 907 908 909 910 911
/*
 * NOTE: in a 32bit arch with a preemptable kernel and
 * an UP compile the i_size_read/write must be atomic
 * with respect to the local cpu (unlike with preempt disabled),
 * but they don't need to be atomic with respect to other cpus like in
 * true SMP (so they need either to either locally disable irq around
 * the read or for example on x86 they can be still implemented as a
 * cmpxchg8b without the need of the lock prefix). For SMP compiles
 * and 64bit archs it makes no difference if preempt is enabled or not.
 */
J
Jan Engelhardt 已提交
912
static inline loff_t i_size_read(const struct inode *inode)
L
Linus Torvalds 已提交
913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	loff_t i_size;
	unsigned int seq;

	do {
		seq = read_seqcount_begin(&inode->i_size_seqcount);
		i_size = inode->i_size;
	} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
	return i_size;
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	loff_t i_size;

	preempt_disable();
	i_size = inode->i_size;
	preempt_enable();
	return i_size;
#else
	return inode->i_size;
#endif
}

935 936 937 938 939
/*
 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
 */
L
Linus Torvalds 已提交
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
static inline void i_size_write(struct inode *inode, loff_t i_size)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	write_seqcount_begin(&inode->i_size_seqcount);
	inode->i_size = i_size;
	write_seqcount_end(&inode->i_size_seqcount);
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	preempt_disable();
	inode->i_size = i_size;
	preempt_enable();
#else
	inode->i_size = i_size;
#endif
}

955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979
/* Helper functions so that in most cases filesystems will
 * not need to deal directly with kuid_t and kgid_t and can
 * instead deal with the raw numeric values that are stored
 * in the filesystem.
 */
static inline uid_t i_uid_read(const struct inode *inode)
{
	return from_kuid(&init_user_ns, inode->i_uid);
}

static inline gid_t i_gid_read(const struct inode *inode)
{
	return from_kgid(&init_user_ns, inode->i_gid);
}

static inline void i_uid_write(struct inode *inode, uid_t uid)
{
	inode->i_uid = make_kuid(&init_user_ns, uid);
}

static inline void i_gid_write(struct inode *inode, gid_t gid)
{
	inode->i_gid = make_kgid(&init_user_ns, gid);
}

J
Jan Engelhardt 已提交
980
static inline unsigned iminor(const struct inode *inode)
L
Linus Torvalds 已提交
981 982 983 984
{
	return MINOR(inode->i_rdev);
}

J
Jan Engelhardt 已提交
985
static inline unsigned imajor(const struct inode *inode)
L
Linus Torvalds 已提交
986 987 988 989 990 991 992 993
{
	return MAJOR(inode->i_rdev);
}

extern struct block_device *I_BDEV(struct inode *inode);

struct fown_struct {
	rwlock_t lock;          /* protects pid, uid, euid fields */
994 995
	struct pid *pid;	/* pid or -pgrp where SIGIO should be sent */
	enum pid_type pid_type;	/* Kind of process group SIGIO should be sent to */
996
	kuid_t uid, euid;	/* uid/euid of process setting the owner */
L
Linus Torvalds 已提交
997 998 999 1000 1001 1002 1003
	int signum;		/* posix.1b rt signal to be delivered on IO */
};

/*
 * Track a single file's readahead state
 */
struct file_ra_state {
F
Fengguang Wu 已提交
1004 1005 1006
	pgoff_t start;			/* where readahead started */
	unsigned int size;		/* # of readahead pages */
	unsigned int async_size;	/* do asynchronous readahead when
1007
					   there are only # of pages ahead */
1008

F
Fengguang Wu 已提交
1009
	unsigned int ra_pages;		/* Maximum readahead window */
1010
	unsigned int mmap_miss;		/* Cache miss stat for mmap accesses */
1011
	loff_t prev_pos;		/* Cache last read() position */
L
Linus Torvalds 已提交
1012 1013
};

1014 1015 1016 1017 1018
/*
 * Check if @index falls in the readahead windows.
 */
static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
{
1019 1020
	return (index >= ra->start &&
		index <  ra->start + ra->size);
1021 1022
}

1023 1024 1025
#define FILE_MNT_WRITE_TAKEN	1
#define FILE_MNT_WRITE_RELEASED	2

L
Linus Torvalds 已提交
1026
struct file {
E
Eric Dumazet 已提交
1027 1028 1029 1030 1031 1032 1033 1034
	/*
	 * fu_list becomes invalid after file_free is called and queued via
	 * fu_rcuhead for RCU freeing
	 */
	union {
		struct list_head	fu_list;
		struct rcu_head 	fu_rcuhead;
	} f_u;
1035 1036 1037
	struct path		f_path;
#define f_dentry	f_path.dentry
#define f_vfsmnt	f_path.mnt
1038
	const struct file_operations	*f_op;
1039 1040 1041 1042 1043 1044

	/*
	 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
	 * Must not be taken from IRQ context.
	 */
	spinlock_t		f_lock;
N
Nick Piggin 已提交
1045 1046 1047
#ifdef CONFIG_SMP
	int			f_sb_list_cpu;
#endif
A
Al Viro 已提交
1048
	atomic_long_t		f_count;
L
Linus Torvalds 已提交
1049
	unsigned int 		f_flags;
1050
	fmode_t			f_mode;
L
Linus Torvalds 已提交
1051 1052
	loff_t			f_pos;
	struct fown_struct	f_owner;
D
David Howells 已提交
1053
	const struct cred	*f_cred;
L
Linus Torvalds 已提交
1054 1055
	struct file_ra_state	f_ra;

1056
	u64			f_version;
1057
#ifdef CONFIG_SECURITY
L
Linus Torvalds 已提交
1058
	void			*f_security;
1059
#endif
L
Linus Torvalds 已提交
1060 1061 1062 1063 1064 1065
	/* needed for tty driver, and maybe others */
	void			*private_data;

#ifdef CONFIG_EPOLL
	/* Used by fs/eventpoll.c to link all the hooks to this file */
	struct list_head	f_ep_links;
J
Jason Baron 已提交
1066
	struct list_head	f_tfile_llink;
L
Linus Torvalds 已提交
1067 1068
#endif /* #ifdef CONFIG_EPOLL */
	struct address_space	*f_mapping;
1069 1070 1071
#ifdef CONFIG_DEBUG_WRITECOUNT
	unsigned long f_mnt_write_state;
#endif
L
Linus Torvalds 已提交
1072 1073
};

1074 1075 1076 1077 1078 1079 1080
struct file_handle {
	__u32 handle_bytes;
	int handle_type;
	/* file identifier */
	unsigned char f_handle[0];
};

A
Al Viro 已提交
1081 1082 1083 1084 1085
static inline struct file *get_file(struct file *f)
{
	atomic_long_inc(&f->f_count);
	return f;
}
1086
#define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
A
Al Viro 已提交
1087
#define file_count(x)	atomic_long_read(&(x)->f_count)
L
Linus Torvalds 已提交
1088

1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
#ifdef CONFIG_DEBUG_WRITECOUNT
static inline void file_take_write(struct file *f)
{
	WARN_ON(f->f_mnt_write_state != 0);
	f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
}
static inline void file_release_write(struct file *f)
{
	f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
}
static inline void file_reset_write(struct file *f)
{
	f->f_mnt_write_state = 0;
}
static inline void file_check_state(struct file *f)
{
	/*
	 * At this point, either both or neither of these bits
	 * should be set.
	 */
	WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
	WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
}
static inline int file_check_writeable(struct file *f)
{
	if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
		return 0;
	printk(KERN_WARNING "writeable file with no "
			    "mnt_want_write()\n");
	WARN_ON(1);
	return -EINVAL;
}
#else /* !CONFIG_DEBUG_WRITECOUNT */
static inline void file_take_write(struct file *filp) {}
static inline void file_release_write(struct file *filp) {}
static inline void file_reset_write(struct file *filp) {}
static inline void file_check_state(struct file *filp) {}
static inline int file_check_writeable(struct file *filp)
{
	return 0;
}
#endif /* CONFIG_DEBUG_WRITECOUNT */

L
Linus Torvalds 已提交
1132 1133 1134 1135 1136
#define	MAX_NON_LFS	((1UL<<31) - 1)

/* Page cache limit. The filesystems should put that into their s_maxbytes 
   limits, otherwise bad things can happen in VM. */ 
#if BITS_PER_LONG==32
C
Chuck Lever 已提交
1137
#define MAX_LFS_FILESIZE	(((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
L
Linus Torvalds 已提交
1138
#elif BITS_PER_LONG==64
1139
#define MAX_LFS_FILESIZE 	((loff_t)0x7fffffffffffffffLL)
L
Linus Torvalds 已提交
1140 1141 1142 1143 1144
#endif

#define FL_POSIX	1
#define FL_FLOCK	2
#define FL_ACCESS	8	/* not trying to lock, just looking */
1145
#define FL_EXISTS	16	/* when unlocking, test for existence */
L
Linus Torvalds 已提交
1146
#define FL_LEASE	32	/* lease held on this file */
1147
#define FL_CLOSE	64	/* unlock on close */
L
Linus Torvalds 已提交
1148
#define FL_SLEEP	128	/* A blocking lock */
1149 1150
#define FL_DOWNGRADE_PENDING	256 /* Lease is being downgraded */
#define FL_UNLOCK_PENDING	512 /* Lease is being broken */
L
Linus Torvalds 已提交
1151

1152 1153 1154 1155 1156 1157
/*
 * Special return value from posix_lock_file() and vfs_lock_file() for
 * asynchronous locking.
 */
#define FILE_LOCK_DEFERRED 1

L
Linus Torvalds 已提交
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
/*
 * The POSIX file lock owner is determined by
 * the "struct files_struct" in the thread group
 * (or NULL for no owner - BSD locks).
 *
 * Lockd stuffs a "host" pointer into this.
 */
typedef struct files_struct *fl_owner_t;

struct file_lock_operations {
	void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
	void (*fl_release_private)(struct file_lock *);
};

struct lock_manager_operations {
J
J. Bruce Fields 已提交
1173 1174 1175 1176 1177
	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
	void (*lm_notify)(struct file_lock *);	/* unblock callback */
	int (*lm_grant)(struct file_lock *, struct file_lock *, int);
	void (*lm_break)(struct file_lock *);
	int (*lm_change)(struct file_lock **, int);
L
Linus Torvalds 已提交
1178 1179
};

1180 1181 1182 1183
struct lock_manager {
	struct list_head list;
};

1184 1185
struct net;
void locks_start_grace(struct net *, struct lock_manager *);
1186
void locks_end_grace(struct lock_manager *);
1187
int locks_in_grace(struct net *);
1188

L
Linus Torvalds 已提交
1189 1190 1191 1192 1193 1194 1195 1196
/* that will die - we need it for nfs_lock_info */
#include <linux/nfs_fs_i.h>

struct file_lock {
	struct file_lock *fl_next;	/* singly linked list for this inode  */
	struct list_head fl_link;	/* doubly linked list of all locks */
	struct list_head fl_block;	/* circular list of blocked processes */
	fl_owner_t fl_owner;
1197
	unsigned int fl_flags;
1198
	unsigned char fl_type;
L
Linus Torvalds 已提交
1199
	unsigned int fl_pid;
1200
	struct pid *fl_nspid;
L
Linus Torvalds 已提交
1201 1202 1203 1204 1205 1206
	wait_queue_head_t fl_wait;
	struct file *fl_file;
	loff_t fl_start;
	loff_t fl_end;

	struct fasync_struct *	fl_fasync; /* for lease break notifications */
1207 1208 1209
	/* for lease breaks: */
	unsigned long fl_break_time;
	unsigned long fl_downgrade_time;
L
Linus Torvalds 已提交
1210

1211
	const struct file_lock_operations *fl_ops;	/* Callbacks for filesystems */
1212
	const struct lock_manager_operations *fl_lmops;	/* Callbacks for lockmanagers */
L
Linus Torvalds 已提交
1213 1214
	union {
		struct nfs_lock_info	nfs_fl;
1215
		struct nfs4_lock_info	nfs4_fl;
D
David Howells 已提交
1216 1217 1218 1219
		struct {
			struct list_head link;	/* link in AFS vnode's pending_locks list */
			int state;		/* state of grant or error if -ve */
		} afs;
L
Linus Torvalds 已提交
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
	} fl_u;
};

/* The following constant reflects the upper bound of the file/locking space */
#ifndef OFFSET_MAX
#define INT_LIMIT(x)	(~((x)1 << (sizeof(x)*8 - 1)))
#define OFFSET_MAX	INT_LIMIT(loff_t)
#define OFFT_OFFSET_MAX	INT_LIMIT(off_t)
#endif

#include <linux/fcntl.h>

1232 1233 1234
extern void send_sigio(struct fown_struct *fown, int fd, int band);

#ifdef CONFIG_FILE_LOCKING
L
Linus Torvalds 已提交
1235
extern int fcntl_getlk(struct file *, struct flock __user *);
1236 1237
extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
			struct flock __user *);
L
Linus Torvalds 已提交
1238 1239 1240

#if BITS_PER_LONG == 32
extern int fcntl_getlk64(struct file *, struct flock64 __user *);
1241 1242
extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
			struct flock64 __user *);
L
Linus Torvalds 已提交
1243 1244 1245 1246 1247 1248
#endif

extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
extern int fcntl_getlease(struct file *filp);

/* fs/locks.c */
1249
void locks_free_lock(struct file_lock *fl);
L
Linus Torvalds 已提交
1250
extern void locks_init_lock(struct file_lock *);
1251
extern struct file_lock * locks_alloc_lock(void);
L
Linus Torvalds 已提交
1252
extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1253
extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
L
Linus Torvalds 已提交
1254 1255
extern void locks_remove_posix(struct file *, fl_owner_t);
extern void locks_remove_flock(struct file *);
1256
extern void locks_release_private(struct file_lock *);
1257
extern void posix_test_lock(struct file *, struct file_lock *);
1258
extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
L
Linus Torvalds 已提交
1259
extern int posix_lock_file_wait(struct file *, struct file_lock *);
J
J. Bruce Fields 已提交
1260
extern int posix_unblock_lock(struct file *, struct file_lock *);
1261
extern int vfs_test_lock(struct file *, struct file_lock *);
1262
extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
M
Marc Eshel 已提交
1263
extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
L
Linus Torvalds 已提交
1264 1265 1266
extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
extern int __break_lease(struct inode *inode, unsigned int flags);
extern void lease_get_mtime(struct inode *, struct timespec *time);
1267
extern int generic_setlease(struct file *, long, struct file_lock **);
1268
extern int vfs_setlease(struct file *, long, struct file_lock **);
L
Linus Torvalds 已提交
1269 1270 1271
extern int lease_modify(struct file_lock **, int);
extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
1272
extern void locks_delete_block(struct file_lock *waiter);
1273 1274
extern void lock_flocks(void);
extern void unlock_flocks(void);
1275
#else /* !CONFIG_FILE_LOCKING */
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
static inline int fcntl_getlk(struct file *file, struct flock __user *user)
{
	return -EINVAL;
}

static inline int fcntl_setlk(unsigned int fd, struct file *file,
			      unsigned int cmd, struct flock __user *user)
{
	return -EACCES;
}

1287
#if BITS_PER_LONG == 32
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
{
	return -EINVAL;
}

static inline int fcntl_setlk64(unsigned int fd, struct file *file,
				unsigned int cmd, struct flock64 __user *user)
{
	return -EACCES;
}
1298
#endif
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416
static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
{
	return 0;
}

static inline int fcntl_getlease(struct file *filp)
{
	return 0;
}

static inline void locks_init_lock(struct file_lock *fl)
{
	return;
}

static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
	return;
}

static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
	return;
}

static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
{
	return;
}

static inline void locks_remove_flock(struct file *filp)
{
	return;
}

static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
{
	return;
}

static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
				  struct file_lock *conflock)
{
	return -ENOLCK;
}

static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
{
	return -ENOLCK;
}

static inline int posix_unblock_lock(struct file *filp,
				     struct file_lock *waiter)
{
	return -ENOENT;
}

static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
				struct file_lock *fl, struct file_lock *conf)
{
	return -ENOLCK;
}

static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

static inline int flock_lock_file_wait(struct file *filp,
				       struct file_lock *request)
{
	return -ENOLCK;
}

static inline int __break_lease(struct inode *inode, unsigned int mode)
{
	return 0;
}

static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
{
	return;
}

static inline int generic_setlease(struct file *filp, long arg,
				    struct file_lock **flp)
{
	return -EINVAL;
}

static inline int vfs_setlease(struct file *filp, long arg,
			       struct file_lock **lease)
{
	return -EINVAL;
}

static inline int lease_modify(struct file_lock **before, int arg)
{
	return -EINVAL;
}

static inline int lock_may_read(struct inode *inode, loff_t start,
				unsigned long len)
{
	return 1;
}

static inline int lock_may_write(struct inode *inode, loff_t start,
				 unsigned long len)
{
	return 1;
}

1417 1418 1419 1420
static inline void locks_delete_block(struct file_lock *waiter)
{
}

1421 1422 1423 1424 1425 1426 1427 1428
static inline void lock_flocks(void)
{
}

static inline void unlock_flocks(void)
{
}

1429 1430
#endif /* !CONFIG_FILE_LOCKING */

L
Linus Torvalds 已提交
1431 1432

struct fasync_struct {
1433 1434 1435 1436 1437 1438
	spinlock_t		fa_lock;
	int			magic;
	int			fa_fd;
	struct fasync_struct	*fa_next; /* singly linked list */
	struct file		*fa_file;
	struct rcu_head		fa_rcu;
L
Linus Torvalds 已提交
1439 1440 1441 1442 1443 1444
};

#define FASYNC_MAGIC 0x4601

/* SMP safe fasync helpers: */
extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1445 1446 1447 1448 1449
extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
extern int fasync_remove_entry(struct file *, struct fasync_struct **);
extern struct fasync_struct *fasync_alloc(void);
extern void fasync_free(struct fasync_struct *);

L
Linus Torvalds 已提交
1450 1451 1452
/* can be called from interrupts */
extern void kill_fasync(struct fasync_struct **, int, int);

1453
extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
L
Linus Torvalds 已提交
1454 1455
extern int f_setown(struct file *filp, unsigned long arg, int force);
extern void f_delown(struct file *filp);
1456
extern pid_t f_getown(struct file *filp);
L
Linus Torvalds 已提交
1457 1458
extern int send_sigurg(struct fown_struct *fown);

1459 1460
struct mm_struct;

L
Linus Torvalds 已提交
1461 1462 1463 1464 1465 1466 1467
/*
 *	Umount options
 */

#define MNT_FORCE	0x00000001	/* Attempt to forcibily umount */
#define MNT_DETACH	0x00000002	/* Just detach from the tree */
#define MNT_EXPIRE	0x00000004	/* Mark for expiry */
1468 1469
#define UMOUNT_NOFOLLOW	0x00000008	/* Don't follow symlink on umount */
#define UMOUNT_UNUSED	0x80000000	/* Flag guaranteed to be unused */
L
Linus Torvalds 已提交
1470 1471 1472 1473

extern struct list_head super_blocks;
extern spinlock_t sb_lock;

1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
/* Possible states of 'frozen' field */
enum {
	SB_UNFROZEN = 0,		/* FS is unfrozen */
	SB_FREEZE_WRITE	= 1,		/* Writes, dir ops, ioctls frozen */
	SB_FREEZE_PAGEFAULT = 2,	/* Page faults stopped as well */
	SB_FREEZE_FS = 3,		/* For internal FS use (e.g. to stop
					 * internal threads if needed) */
	SB_FREEZE_COMPLETE = 4,		/* ->freeze_fs finished successfully */
};

#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)

struct sb_writers {
	/* Counters for counting writers at each level */
	struct percpu_counter	counter[SB_FREEZE_LEVELS];
	wait_queue_head_t	wait;		/* queue for waiting for
						   writers / faults to finish */
	int			frozen;		/* Is sb frozen? */
	wait_queue_head_t	wait_unfrozen;	/* queue for waiting for
						   sb to be thawed */
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lockdep_map	lock_map[SB_FREEZE_LEVELS];
#endif
};

L
Linus Torvalds 已提交
1499 1500 1501
struct super_block {
	struct list_head	s_list;		/* Keep this first */
	dev_t			s_dev;		/* search index; _not_ kdev_t */
1502 1503
	unsigned char		s_blocksize_bits;
	unsigned long		s_blocksize;
1504
	loff_t			s_maxbytes;	/* Max file size */
L
Linus Torvalds 已提交
1505
	struct file_system_type	*s_type;
1506
	const struct super_operations	*s_op;
1507
	const struct dquot_operations	*dq_op;
1508
	const struct quotactl_ops	*s_qcop;
1509
	const struct export_operations *s_export_op;
L
Linus Torvalds 已提交
1510 1511 1512 1513 1514 1515
	unsigned long		s_flags;
	unsigned long		s_magic;
	struct dentry		*s_root;
	struct rw_semaphore	s_umount;
	int			s_count;
	atomic_t		s_active;
1516
#ifdef CONFIG_SECURITY
L
Linus Torvalds 已提交
1517
	void                    *s_security;
1518
#endif
1519
	const struct xattr_handler **s_xattr;
L
Linus Torvalds 已提交
1520 1521

	struct list_head	s_inodes;	/* all inodes */
1522
	struct hlist_bl_head	s_anon;		/* anonymous dentries for (nfs) exporting */
N
Nick Piggin 已提交
1523 1524 1525
#ifdef CONFIG_SMP
	struct list_head __percpu *s_files;
#else
L
Linus Torvalds 已提交
1526
	struct list_head	s_files;
N
Nick Piggin 已提交
1527
#endif
1528
	struct list_head	s_mounts;	/* list of mounts; _not_ for fs use */
N
Nick Piggin 已提交
1529
	/* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1530 1531
	struct list_head	s_dentry_lru;	/* unused dentry lru */
	int			s_nr_dentry_unused;	/* # of dentry on lru */
L
Linus Torvalds 已提交
1532

D
Dave Chinner 已提交
1533 1534
	/* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
	spinlock_t		s_inode_lru_lock ____cacheline_aligned_in_smp;
1535 1536 1537
	struct list_head	s_inode_lru;		/* unused inode lru */
	int			s_nr_inodes_unused;	/* # of inodes on lru */

L
Linus Torvalds 已提交
1538
	struct block_device	*s_bdev;
J
Jens Axboe 已提交
1539
	struct backing_dev_info *s_bdi;
1540
	struct mtd_info		*s_mtd;
A
Al Viro 已提交
1541
	struct hlist_node	s_instances;
L
Linus Torvalds 已提交
1542 1543
	struct quota_info	s_dquot;	/* Diskquota specific options */

1544
	struct sb_writers	s_writers;
L
Linus Torvalds 已提交
1545 1546

	char s_id[32];				/* Informational name */
1547
	u8 s_uuid[16];				/* UUID */
L
Linus Torvalds 已提交
1548 1549

	void 			*s_fs_info;	/* Filesystem private info */
1550
	unsigned int		s_max_links;
1551
	fmode_t			s_mode;
L
Linus Torvalds 已提交
1552

1553 1554 1555 1556
	/* Granularity of c/m/atime in ns.
	   Cannot be worse than a second */
	u32		   s_time_gran;

L
Linus Torvalds 已提交
1557 1558 1559 1560
	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
1561
	struct mutex s_vfs_rename_mutex;	/* Kludge */
L
Linus Torvalds 已提交
1562

M
Miklos Szeredi 已提交
1563 1564 1565 1566 1567
	/*
	 * Filesystem subtype.  If non-empty the filesystem type field
	 * in /proc/mounts will be "type.subtype"
	 */
	char *s_subtype;
1568 1569 1570 1571 1572

	/*
	 * Saved mount options for lazy filesystems using
	 * generic_show_options()
	 */
A
Arnd Bergmann 已提交
1573
	char __rcu *s_options;
A
Al Viro 已提交
1574
	const struct dentry_operations *s_d_op; /* default d_op for dentries */
1575 1576 1577 1578 1579

	/*
	 * Saved pool identifier for cleancache (-1 means none)
	 */
	int cleancache_poolid;
1580 1581

	struct shrinker s_shrink;	/* per-sb shrinker handle */
1582

M
Miklos Szeredi 已提交
1583 1584 1585
	/* Number of inodes with nlink == 0 but still referenced */
	atomic_long_t s_remove_count;

1586 1587
	/* Being remounted read-only */
	int s_readonly_remount;
L
Linus Torvalds 已提交
1588 1589
};

1590 1591 1592 1593
/* superblock cache pruning functions */
extern void prune_icache_sb(struct super_block *sb, int nr_to_scan);
extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan);

L
Linus Torvalds 已提交
1594 1595 1596 1597 1598 1599
extern struct timespec current_fs_time(struct super_block *sb);

/*
 * Snapshotting support.
 */

1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
void __sb_end_write(struct super_block *sb, int level);
int __sb_start_write(struct super_block *sb, int level, bool wait);

/**
 * sb_end_write - drop write access to a superblock
 * @sb: the super we wrote to
 *
 * Decrement number of writers to the filesystem. Wake up possible waiters
 * wanting to freeze the filesystem.
 */
static inline void sb_end_write(struct super_block *sb)
{
	__sb_end_write(sb, SB_FREEZE_WRITE);
}

/**
 * sb_end_pagefault - drop write access to a superblock from a page fault
 * @sb: the super we wrote to
 *
 * Decrement number of processes handling write page fault to the filesystem.
 * Wake up possible waiters wanting to freeze the filesystem.
 */
static inline void sb_end_pagefault(struct super_block *sb)
{
	__sb_end_write(sb, SB_FREEZE_PAGEFAULT);
}

/**
 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
 * @sb: the super we wrote to
 *
 * Decrement fs-internal number of writers to the filesystem.  Wake up possible
 * waiters wanting to freeze the filesystem.
 */
static inline void sb_end_intwrite(struct super_block *sb)
{
	__sb_end_write(sb, SB_FREEZE_FS);
}

/**
 * sb_start_write - get write access to a superblock
 * @sb: the super we write to
 *
 * When a process wants to write data or metadata to a file system (i.e. dirty
 * a page or an inode), it should embed the operation in a sb_start_write() -
 * sb_end_write() pair to get exclusion against file system freezing. This
 * function increments number of writers preventing freezing. If the file
 * system is already frozen, the function waits until the file system is
 * thawed.
 *
 * Since freeze protection behaves as a lock, users have to preserve
 * ordering of freeze protection and other filesystem locks. Generally,
 * freeze protection should be the outermost lock. In particular, we have:
 *
 * sb_start_write
 *   -> i_mutex			(write path, truncate, directory ops, ...)
 *   -> s_umount		(freeze_super, thaw_super)
 */
static inline void sb_start_write(struct super_block *sb)
{
	__sb_start_write(sb, SB_FREEZE_WRITE, true);
}

static inline int sb_start_write_trylock(struct super_block *sb)
{
	return __sb_start_write(sb, SB_FREEZE_WRITE, false);
}

/**
 * sb_start_pagefault - get write access to a superblock from a page fault
 * @sb: the super we write to
 *
 * When a process starts handling write page fault, it should embed the
 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
 * exclusion against file system freezing. This is needed since the page fault
 * is going to dirty a page. This function increments number of running page
 * faults preventing freezing. If the file system is already frozen, the
 * function waits until the file system is thawed.
 *
 * Since page fault freeze protection behaves as a lock, users have to preserve
 * ordering of freeze protection and other filesystem locks. It is advised to
 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
 * handling code implies lock dependency:
 *
 * mmap_sem
 *   -> sb_start_pagefault
 */
static inline void sb_start_pagefault(struct super_block *sb)
{
	__sb_start_write(sb, SB_FREEZE_PAGEFAULT, true);
}

/*
 * sb_start_intwrite - get write access to a superblock for internal fs purposes
 * @sb: the super we write to
 *
 * This is the third level of protection against filesystem freezing. It is
 * free for use by a filesystem. The only requirement is that it must rank
 * below sb_start_pagefault.
 *
 * For example filesystem can call sb_start_intwrite() when starting a
 * transaction which somewhat eases handling of freezing for internal sources
 * of filesystem changes (internal fs threads, discarding preallocation on file
 * close, etc.).
 */
static inline void sb_start_intwrite(struct super_block *sb)
{
	__sb_start_write(sb, SB_FREEZE_FS, true);
}
L
Linus Torvalds 已提交
1709 1710


1711
extern bool inode_owner_or_capable(const struct inode *inode);
1712

1713 1714 1715
/* not quite ready to be deprecated, but... */
extern void lock_super(struct super_block *);
extern void unlock_super(struct super_block *);
L
Linus Torvalds 已提交
1716 1717 1718 1719

/*
 * VFS helper functions..
 */
A
Al Viro 已提交
1720
extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
1721
extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
A
Al Viro 已提交
1722
extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
1723
extern int vfs_symlink(struct inode *, struct dentry *, const char *);
L
Linus Torvalds 已提交
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
extern int vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *);
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);

/*
 * VFS dentry helper functions.
 */
extern void dentry_unhash(struct dentry *dentry);

1734 1735 1736
/*
 * VFS file helper functions.
 */
1737
extern void inode_init_owner(struct inode *inode, const struct inode *dir,
A
Al Viro 已提交
1738
			umode_t mode);
M
Mark Fasheh 已提交
1739 1740 1741 1742 1743 1744 1745
/*
 * VFS FS_IOC_FIEMAP helper definitions.
 */
struct fiemap_extent_info {
	unsigned int fi_flags;		/* Flags as passed from user */
	unsigned int fi_extents_mapped;	/* Number of mapped extents */
	unsigned int fi_extents_max;	/* Size of fiemap_extent array */
1746 1747
	struct fiemap_extent __user *fi_extents_start; /* Start of
							fiemap_extent array */
M
Mark Fasheh 已提交
1748 1749 1750 1751 1752
};
int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
			    u64 phys, u64 len, u32 flags);
int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);

L
Linus Torvalds 已提交
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
/*
 * File types
 *
 * NOTE! These match bits 12..15 of stat.st_mode
 * (ie "(i_mode >> 12) & 15").
 */
#define DT_UNKNOWN	0
#define DT_FIFO		1
#define DT_CHR		2
#define DT_DIR		4
#define DT_BLK		6
#define DT_REG		8
#define DT_LNK		10
#define DT_SOCK		12
#define DT_WHT		14

/*
 * This is the "filldir" function type, used by readdir() to let
 * the kernel specify what kind of dirent layout it wants to have.
 * This allows the kernel to read directories into kernel space or
 * to have different dirent layouts depending on the binary type.
 */
1775
typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1776
struct block_device_operations;
L
Linus Torvalds 已提交
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788

/* These macros are for out of kernel modules to test that
 * the kernel supports the unlocked_ioctl and compat_ioctl
 * fields in struct file_operations. */
#define HAVE_COMPAT_IOCTL 1
#define HAVE_UNLOCKED_IOCTL 1

struct file_operations {
	struct module *owner;
	loff_t (*llseek) (struct file *, loff_t, int);
	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1789 1790
	ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
	ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
L
Linus Torvalds 已提交
1791 1792 1793 1794 1795 1796
	int (*readdir) (struct file *, void *, filldir_t);
	unsigned int (*poll) (struct file *, struct poll_table_struct *);
	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
	int (*mmap) (struct file *, struct vm_area_struct *);
	int (*open) (struct inode *, struct file *);
1797
	int (*flush) (struct file *, fl_owner_t id);
L
Linus Torvalds 已提交
1798
	int (*release) (struct inode *, struct file *);
1799
	int (*fsync) (struct file *, loff_t, loff_t, int datasync);
L
Linus Torvalds 已提交
1800 1801 1802 1803 1804 1805 1806
	int (*aio_fsync) (struct kiocb *, int datasync);
	int (*fasync) (int, struct file *, int);
	int (*lock) (struct file *, int, struct file_lock *);
	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
	int (*check_flags)(int);
	int (*flock) (struct file *, int, struct file_lock *);
1807 1808
	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
	ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1809
	int (*setlease)(struct file *, long, struct file_lock **);
1810 1811
	long (*fallocate)(struct file *file, int mode, loff_t offset,
			  loff_t len);
L
Linus Torvalds 已提交
1812 1813 1814
};

struct inode_operations {
A
Al Viro 已提交
1815
	struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
1816
	void * (*follow_link) (struct dentry *, struct nameidata *);
1817
	int (*permission) (struct inode *, int);
1818
	struct posix_acl * (*get_acl)(struct inode *, int);
1819 1820 1821 1822

	int (*readlink) (struct dentry *, char __user *,int);
	void (*put_link) (struct dentry *, struct nameidata *, void *);

A
Al Viro 已提交
1823
	int (*create) (struct inode *,struct dentry *, umode_t, bool);
L
Linus Torvalds 已提交
1824 1825 1826
	int (*link) (struct dentry *,struct inode *,struct dentry *);
	int (*unlink) (struct inode *,struct dentry *);
	int (*symlink) (struct inode *,struct dentry *,const char *);
1827
	int (*mkdir) (struct inode *,struct dentry *,umode_t);
L
Linus Torvalds 已提交
1828
	int (*rmdir) (struct inode *,struct dentry *);
A
Al Viro 已提交
1829
	int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
L
Linus Torvalds 已提交
1830 1831 1832 1833 1834 1835 1836 1837 1838
	int (*rename) (struct inode *, struct dentry *,
			struct inode *, struct dentry *);
	void (*truncate) (struct inode *);
	int (*setattr) (struct dentry *, struct iattr *);
	int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
	int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
	ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
	ssize_t (*listxattr) (struct dentry *, char *, size_t);
	int (*removexattr) (struct dentry *, const char *);
M
Mark Fasheh 已提交
1839 1840
	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
		      u64 len);
1841
	int (*update_time)(struct inode *, struct timespec *, int);
A
Al Viro 已提交
1842
	int (*atomic_open)(struct inode *, struct dentry *,
A
Al Viro 已提交
1843
			   struct file *, unsigned open_flag,
A
Al Viro 已提交
1844
			   umode_t create_mode, int *opened);
1845
} ____cacheline_aligned;
L
Linus Torvalds 已提交
1846 1847 1848

struct seq_file;

B
Badari Pulavarty 已提交
1849
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
C
Christopher Yeoh 已提交
1850 1851
			      unsigned long nr_segs, unsigned long fast_segs,
			      struct iovec *fast_pointer,
1852
			      struct iovec **ret_pointer);
B
Badari Pulavarty 已提交
1853

L
Linus Torvalds 已提交
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
		unsigned long, loff_t *);
extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
		unsigned long, loff_t *);

struct super_operations {
   	struct inode *(*alloc_inode)(struct super_block *sb);
	void (*destroy_inode)(struct inode *);

1865
   	void (*dirty_inode) (struct inode *, int flags);
1866
	int (*write_inode) (struct inode *, struct writeback_control *wbc);
1867
	int (*drop_inode) (struct inode *);
A
Al Viro 已提交
1868
	void (*evict_inode) (struct inode *);
L
Linus Torvalds 已提交
1869 1870
	void (*put_super) (struct super_block *);
	int (*sync_fs)(struct super_block *sb, int wait);
1871 1872
	int (*freeze_fs) (struct super_block *);
	int (*unfreeze_fs) (struct super_block *);
1873
	int (*statfs) (struct dentry *, struct kstatfs *);
L
Linus Torvalds 已提交
1874
	int (*remount_fs) (struct super_block *, int *, char *);
1875
	void (*umount_begin) (struct super_block *);
L
Linus Torvalds 已提交
1876

1877
	int (*show_options)(struct seq_file *, struct dentry *);
1878
	int (*show_devname)(struct seq_file *, struct dentry *);
1879
	int (*show_path)(struct seq_file *, struct dentry *);
1880
	int (*show_stats)(struct seq_file *, struct dentry *);
1881
#ifdef CONFIG_QUOTA
L
Linus Torvalds 已提交
1882 1883
	ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
	ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1884
#endif
1885
	int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1886 1887
	int (*nr_cached_objects)(struct super_block *);
	void (*free_cached_objects)(struct super_block *, int);
L
Linus Torvalds 已提交
1888 1889
};

J
Joern Engel 已提交
1890
/*
1891
 * Inode state bits.  Protected by inode->i_lock
J
Joern Engel 已提交
1892 1893 1894 1895 1896 1897 1898 1899
 *
 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
 *
 * Four bits define the lifetime of an inode.  Initially, inodes are I_NEW,
 * until that flag is cleared.  I_WILL_FREE, I_FREEING and I_CLEAR are set at
 * various stages of removing an inode.
 *
C
Christoph Hellwig 已提交
1900
 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
J
Joern Engel 已提交
1901
 *
J
Joern Engel 已提交
1902 1903
 * I_DIRTY_SYNC		Inode is dirty, but doesn't have to be written on
 *			fdatasync().  i_atime is the usual cause.
1904 1905 1906 1907
 * I_DIRTY_DATASYNC	Data-related inode changes pending. We keep track of
 *			these changes separately from I_DIRTY_SYNC so that we
 *			don't have to write inode on fdatasync() when only
 *			mtime has changed in it.
J
Joern Engel 已提交
1908
 * I_DIRTY_PAGES	Inode has dirty pages.  Inode itself may be clean.
C
Christoph Hellwig 已提交
1909 1910 1911 1912 1913 1914 1915 1916
 * I_NEW		Serves as both a mutex and completion notification.
 *			New inodes set I_NEW.  If two processes both create
 *			the same inode, one of them will release its inode and
 *			wait for I_NEW to be released before returning.
 *			Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
 *			also cause waiting on I_NEW, without I_NEW actually
 *			being set.  find_inode() uses this to prevent returning
 *			nearly-dead inodes.
J
Joern Engel 已提交
1917 1918 1919 1920 1921 1922
 * I_WILL_FREE		Must be set when calling write_inode_now() if i_count
 *			is zero.  I_FREEING must be set when I_WILL_FREE is
 *			cleared.
 * I_FREEING		Set when inode is about to be freed but still has dirty
 *			pages or buffers attached or the inode itself is still
 *			dirty.
1923 1924
 * I_CLEAR		Added by clear_inode().  In this state the inode is
 *			clean and can be destroyed.  Inode keeps I_FREEING.
J
Joern Engel 已提交
1925 1926 1927 1928 1929
 *
 *			Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
 *			prohibited for many purposes.  iget() must wait for
 *			the inode to be completely released, then create it
 *			anew.  Other functions will just ignore such inodes,
C
Christoph Hellwig 已提交
1930
 *			if appropriate.  I_NEW is used for waiting.
J
Joern Engel 已提交
1931
 *
1932 1933 1934 1935
 * I_SYNC		Writeback of inode is running. The bit is set during
 *			data writeback, and cleared with a wakeup on the bit
 *			address once it is done. The bit is also used to pin
 *			the inode in memory for flusher thread.
J
Joern Engel 已提交
1936
 *
C
Christoph Hellwig 已提交
1937 1938 1939 1940
 * I_REFERENCED		Marks the inode as recently references on the LRU list.
 *
 * I_DIO_WAKEUP		Never set.  Only used as a key for wait_on_bit().
 *
J
Joern Engel 已提交
1941 1942
 * Q: What is the difference between I_WILL_FREE and I_FREEING?
 */
1943 1944 1945
#define I_DIRTY_SYNC		(1 << 0)
#define I_DIRTY_DATASYNC	(1 << 1)
#define I_DIRTY_PAGES		(1 << 2)
C
Christoph Hellwig 已提交
1946 1947
#define __I_NEW			3
#define I_NEW			(1 << __I_NEW)
1948 1949 1950
#define I_WILL_FREE		(1 << 4)
#define I_FREEING		(1 << 5)
#define I_CLEAR			(1 << 6)
C
Christoph Hellwig 已提交
1951
#define __I_SYNC		7
J
Joern Engel 已提交
1952
#define I_SYNC			(1 << __I_SYNC)
1953
#define I_REFERENCED		(1 << 8)
C
Christoph Hellwig 已提交
1954 1955
#define __I_DIO_WAKEUP		9
#define I_DIO_WAKEUP		(1 << I_DIO_WAKEUP)
L
Linus Torvalds 已提交
1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969

#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)

extern void __mark_inode_dirty(struct inode *, int);
static inline void mark_inode_dirty(struct inode *inode)
{
	__mark_inode_dirty(inode, I_DIRTY);
}

static inline void mark_inode_dirty_sync(struct inode *inode)
{
	__mark_inode_dirty(inode, I_DIRTY_SYNC);
}

M
Miklos Szeredi 已提交
1970 1971 1972 1973
extern void inc_nlink(struct inode *inode);
extern void drop_nlink(struct inode *inode);
extern void clear_nlink(struct inode *inode);
extern void set_nlink(struct inode *inode, unsigned int nlink);
1974 1975 1976 1977

static inline void inode_inc_link_count(struct inode *inode)
{
	inc_nlink(inode);
1978 1979 1980
	mark_inode_dirty(inode);
}

1981 1982 1983
static inline void inode_dec_link_count(struct inode *inode)
{
	drop_nlink(inode);
1984 1985 1986
	mark_inode_dirty(inode);
}

1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
/**
 * inode_inc_iversion - increments i_version
 * @inode: inode that need to be updated
 *
 * Every time the inode is modified, the i_version field will be incremented.
 * The filesystem has to be mounted with i_version flag
 */

static inline void inode_inc_iversion(struct inode *inode)
{
       spin_lock(&inode->i_lock);
       inode->i_version++;
       spin_unlock(&inode->i_lock);
}

2002 2003 2004 2005 2006 2007 2008
enum file_time_flags {
	S_ATIME = 1,
	S_MTIME = 2,
	S_CTIME = 4,
	S_VERSION = 8,
};

A
Al Viro 已提交
2009
extern void touch_atime(struct path *);
L
Linus Torvalds 已提交
2010 2011 2012
static inline void file_accessed(struct file *file)
{
	if (!(file->f_flags & O_NOATIME))
A
Al Viro 已提交
2013
		touch_atime(&file->f_path);
L
Linus Torvalds 已提交
2014 2015 2016
}

int sync_inode(struct inode *inode, struct writeback_control *wbc);
C
Christoph Hellwig 已提交
2017
int sync_inode_metadata(struct inode *inode, int wait);
L
Linus Torvalds 已提交
2018 2019 2020 2021

struct file_system_type {
	const char *name;
	int fs_flags;
A
Al Viro 已提交
2022 2023
	struct dentry *(*mount) (struct file_system_type *, int,
		       const char *, void *);
L
Linus Torvalds 已提交
2024 2025 2026
	void (*kill_sb) (struct super_block *);
	struct module *owner;
	struct file_system_type * next;
A
Al Viro 已提交
2027
	struct hlist_head fs_supers;
2028

I
Ingo Molnar 已提交
2029
	struct lock_class_key s_lock_key;
2030
	struct lock_class_key s_umount_key;
2031
	struct lock_class_key s_vfs_rename_key;
2032
	struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
2033 2034 2035

	struct lock_class_key i_lock_key;
	struct lock_class_key i_mutex_key;
2036
	struct lock_class_key i_mutex_dir_key;
L
Linus Torvalds 已提交
2037 2038
};

A
Al Viro 已提交
2039 2040
extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
	void *data, int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
2041 2042 2043
extern struct dentry *mount_bdev(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
2044 2045 2046
extern struct dentry *mount_single(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
2047 2048 2049
extern struct dentry *mount_nodev(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
2050
extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
L
Linus Torvalds 已提交
2051 2052 2053 2054 2055
void generic_shutdown_super(struct super_block *sb);
void kill_block_super(struct super_block *sb);
void kill_anon_super(struct super_block *sb);
void kill_litter_super(struct super_block *sb);
void deactivate_super(struct super_block *sb);
A
Al Viro 已提交
2056
void deactivate_locked_super(struct super_block *sb);
L
Linus Torvalds 已提交
2057
int set_anon_super(struct super_block *s, void *data);
2058 2059
int get_anon_bdev(dev_t *);
void free_anon_bdev(dev_t);
L
Linus Torvalds 已提交
2060 2061 2062
struct super_block *sget(struct file_system_type *type,
			int (*test)(struct super_block *,void *),
			int (*set)(struct super_block *,void *),
D
David Howells 已提交
2063
			int flags, void *data);
A
Al Viro 已提交
2064
extern struct dentry *mount_pseudo(struct file_system_type *, char *,
2065 2066 2067
	const struct super_operations *ops,
	const struct dentry_operations *dops,
	unsigned long);
L
Linus Torvalds 已提交
2068 2069 2070 2071 2072 2073 2074 2075 2076

/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
#define fops_get(fops) \
	(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
#define fops_put(fops) \
	do { if (fops) module_put((fops)->owner); } while(0)

extern int register_filesystem(struct file_system_type *);
extern int unregister_filesystem(struct file_system_type *);
2077 2078
extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
#define kern_mount(type) kern_mount_data(type, NULL)
2079
extern void kern_unmount(struct vfsmount *mnt);
L
Linus Torvalds 已提交
2080 2081
extern int may_umount_tree(struct vfsmount *);
extern int may_umount(struct vfsmount *);
A
Al Viro 已提交
2082
extern long do_mount(const char *, const char *, const char *, unsigned long, void *);
A
Al Viro 已提交
2083
extern struct vfsmount *collect_mounts(struct path *);
2084
extern void drop_collected_mounts(struct vfsmount *);
A
Al Viro 已提交
2085 2086
extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
			  struct vfsmount *);
2087
extern int vfs_statfs(struct path *, struct kstatfs *);
A
Al Viro 已提交
2088 2089
extern int user_statfs(const char __user *, struct kstatfs *);
extern int fd_statfs(int, struct kstatfs *);
A
Al Viro 已提交
2090
extern int vfs_ustat(dev_t, struct kstatfs *);
2091 2092
extern int freeze_super(struct super_block *super);
extern int thaw_super(struct super_block *super);
2093
extern bool our_mnt(struct vfsmount *mnt);
L
Linus Torvalds 已提交
2094

A
Al Viro 已提交
2095 2096
extern int current_umask(void);

M
Miklos Szeredi 已提交
2097
/* /sys/fs */
2098
extern struct kobject *fs_kobj;
M
Miklos Szeredi 已提交
2099

2100
#define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
2101 2102
extern int rw_verify_area(int, struct file *, loff_t *, size_t);

L
Linus Torvalds 已提交
2103 2104 2105
#define FLOCK_VERIFY_READ  1
#define FLOCK_VERIFY_WRITE 2

2106
#ifdef CONFIG_FILE_LOCKING
L
Linus Torvalds 已提交
2107 2108 2109 2110 2111 2112 2113
extern int locks_mandatory_locked(struct inode *);
extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);

/*
 * Candidates for mandatory locking have the setgid bit set
 * but no group execute bit -  an otherwise meaningless combination.
 */
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128

static inline int __mandatory_lock(struct inode *ino)
{
	return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
}

/*
 * ... and these candidates should be on MS_MANDLOCK mounted fs,
 * otherwise these will be advisory locks
 */

static inline int mandatory_lock(struct inode *ino)
{
	return IS_MANDLOCK(ino) && __mandatory_lock(ino);
}
L
Linus Torvalds 已提交
2129 2130 2131

static inline int locks_verify_locked(struct inode *inode)
{
2132
	if (mandatory_lock(inode))
L
Linus Torvalds 已提交
2133 2134 2135 2136 2137 2138 2139 2140
		return locks_mandatory_locked(inode);
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode,
				    struct file *filp,
				    loff_t size)
{
2141
	if (inode->i_flock && mandatory_lock(inode))
L
Linus Torvalds 已提交
2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156
		return locks_mandatory_area(
			FLOCK_VERIFY_WRITE, inode, filp,
			size < inode->i_size ? size : inode->i_size,
			(size < inode->i_size ? inode->i_size - size
			 : size - inode->i_size)
		);
	return 0;
}

static inline int break_lease(struct inode *inode, unsigned int mode)
{
	if (inode->i_flock)
		return __break_lease(inode, mode);
	return 0;
}
2157
#else /* !CONFIG_FILE_LOCKING */
2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
static inline int locks_mandatory_locked(struct inode *inode)
{
	return 0;
}

static inline int locks_mandatory_area(int rw, struct inode *inode,
				       struct file *filp, loff_t offset,
				       size_t count)
{
	return 0;
}

static inline int __mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int locks_verify_locked(struct inode *inode)
{
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
					size_t size)
{
	return 0;
}

static inline int break_lease(struct inode *inode, unsigned int mode)
{
	return 0;
}

2196
#endif /* CONFIG_FILE_LOCKING */
L
Linus Torvalds 已提交
2197 2198

/* fs/open.c */
2199 2200 2201 2202
struct filename {
	const char *name;		/* pointer to actual string */
	const __user char *uptr;	/* original userland pointer */
};
L
Linus Torvalds 已提交
2203

2204 2205
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
		       struct file *filp);
2206 2207
extern int do_fallocate(struct file *file, int mode, loff_t offset,
			loff_t len);
J
Jason Uhlenkott 已提交
2208
extern long do_sys_open(int dfd, const char __user *filename, int flags,
2209
			umode_t mode);
2210
extern struct file *file_open_name(struct filename *, int, umode_t);
2211
extern struct file *filp_open(const char *, int, umode_t);
A
Al Viro 已提交
2212 2213
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
				   const char *, int);
2214
extern struct file * dentry_open(const struct path *, int, const struct cred *);
L
Linus Torvalds 已提交
2215
extern int filp_close(struct file *, fl_owner_t id);
2216 2217 2218

extern struct filename *getname(const char __user *);

2219 2220 2221 2222
enum {
	FILE_CREATED = 1,
	FILE_OPENED = 2
};
A
Al Viro 已提交
2223 2224 2225
extern int finish_open(struct file *file, struct dentry *dentry,
			int (*open)(struct inode *, struct file *),
			int *opened);
A
Al Viro 已提交
2226
extern int finish_no_open(struct file *file, struct dentry *dentry);
L
Linus Torvalds 已提交
2227

2228 2229 2230 2231
/* fs/ioctl.c */

extern int ioctl_preallocate(struct file *filp, void __user *argp);

L
Linus Torvalds 已提交
2232 2233 2234 2235
/* fs/dcache.c */
extern void __init vfs_caches_init_early(void);
extern void __init vfs_caches_init(unsigned long);

2236 2237
extern struct kmem_cache *names_cachep;

2238 2239
extern void final_putname(struct filename *name);

2240
#define __getname()		kmem_cache_alloc(names_cachep, GFP_KERNEL)
V
Vegard Nossum 已提交
2241
#define __putname(name)		kmem_cache_free(names_cachep, (void *)(name))
L
Linus Torvalds 已提交
2242
#ifndef CONFIG_AUDITSYSCALL
2243
#define putname(name)		final_putname(name)
L
Linus Torvalds 已提交
2244
#else
2245
extern void putname(struct filename *name);
L
Linus Torvalds 已提交
2246 2247
#endif

2248
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2249
extern int register_blkdev(unsigned int, const char *);
A
Akinobu Mita 已提交
2250
extern void unregister_blkdev(unsigned int, const char *);
L
Linus Torvalds 已提交
2251
extern struct block_device *bdget(dev_t);
2252
extern struct block_device *bdgrab(struct block_device *bdev);
L
Linus Torvalds 已提交
2253
extern void bd_set_size(struct block_device *, loff_t size);
2254
extern sector_t blkdev_max_block(struct block_device *bdev);
L
Linus Torvalds 已提交
2255 2256
extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
N
Nick Piggin 已提交
2257
extern void invalidate_bdev(struct block_device *);
2258
extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
N
Nick Piggin 已提交
2259
extern int sync_blockdev(struct block_device *bdev);
A
Al Viro 已提交
2260
extern void kill_bdev(struct block_device *);
N
Nick Piggin 已提交
2261
extern struct super_block *freeze_bdev(struct block_device *);
2262
extern void emergency_thaw_all(void);
N
Nick Piggin 已提交
2263 2264
extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
extern int fsync_bdev(struct block_device *);
2265 2266
#else
static inline void bd_forget(struct inode *inode) {}
2267
static inline int sync_blockdev(struct block_device *bdev) { return 0; }
A
Al Viro 已提交
2268
static inline void kill_bdev(struct block_device *bdev) {}
2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279
static inline void invalidate_bdev(struct block_device *bdev) {}

static inline struct super_block *freeze_bdev(struct block_device *sb)
{
	return NULL;
}

static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
{
	return 0;
}
2280 2281 2282 2283

static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
{
}
2284
#endif
2285
extern int sync_filesystem(struct super_block *);
2286
extern const struct file_operations def_blk_fops;
2287 2288 2289
extern const struct file_operations def_chr_fops;
extern const struct file_operations bad_sock_fops;
extern const struct file_operations def_fifo_fops;
2290
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2291
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2292
extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
L
Linus Torvalds 已提交
2293
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2294
extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2295 2296 2297 2298
extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
					       void *holder);
extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
					      void *holder);
2299
extern int blkdev_put(struct block_device *bdev, fmode_t mode);
2300
#ifdef CONFIG_SYSFS
2301
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2302 2303
extern void bd_unlink_disk_holder(struct block_device *bdev,
				  struct gendisk *disk);
2304
#else
2305 2306 2307 2308 2309
static inline int bd_link_disk_holder(struct block_device *bdev,
				      struct gendisk *disk)
{
	return 0;
}
2310 2311 2312 2313
static inline void bd_unlink_disk_holder(struct block_device *bdev,
					 struct gendisk *disk)
{
}
2314
#endif
2315
#endif
L
Linus Torvalds 已提交
2316 2317

/* fs/char_dev.c */
2318
#define CHRDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2319 2320
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
extern int register_chrdev_region(dev_t, unsigned, const char *);
2321 2322 2323 2324 2325
extern int __register_chrdev(unsigned int major, unsigned int baseminor,
			     unsigned int count, const char *name,
			     const struct file_operations *fops);
extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
				unsigned int count, const char *name);
L
Linus Torvalds 已提交
2326
extern void unregister_chrdev_region(dev_t, unsigned);
2327
extern void chrdev_show(struct seq_file *,off_t);
L
Linus Torvalds 已提交
2328

2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
static inline int register_chrdev(unsigned int major, const char *name,
				  const struct file_operations *fops)
{
	return __register_chrdev(major, 0, 256, name, fops);
}

static inline void unregister_chrdev(unsigned int major, const char *name)
{
	__unregister_chrdev(major, 0, 256, name);
}

L
Linus Torvalds 已提交
2340 2341
/* fs/block_dev.c */
#define BDEVNAME_SIZE	32	/* Largest string for a blockdev identifier */
2342
#define BDEVT_SIZE	10	/* Largest string for MAJ:MIN for blkdev */
2343 2344 2345

#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2346 2347 2348
extern const char *__bdevname(dev_t, char *buffer);
extern const char *bdevname(struct block_device *bdev, char *buffer);
extern struct block_device *lookup_bdev(const char *);
2349
extern void blkdev_show(struct seq_file *,off_t);
2350

2351 2352 2353
#else
#define BLKDEV_MAJOR_HASH_SIZE	0
#endif
L
Linus Torvalds 已提交
2354 2355 2356 2357 2358 2359 2360

extern void init_special_inode(struct inode *, umode_t, dev_t);

/* Invalid inode operations -- fs/bad_inode.c */
extern void make_bad_inode(struct inode *);
extern int is_bad_inode(struct inode *);

2361 2362 2363
extern const struct file_operations read_pipefifo_fops;
extern const struct file_operations write_pipefifo_fops;
extern const struct file_operations rdwr_pipefifo_fops;
L
Linus Torvalds 已提交
2364

2365
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375
/*
 * return READ, READA, or WRITE
 */
#define bio_rw(bio)		((bio)->bi_rw & (RW_MASK | RWA_MASK))

/*
 * return data direction, READ or WRITE
 */
#define bio_data_dir(bio)	((bio)->bi_rw & 1)

2376 2377
extern void check_disk_size_change(struct gendisk *disk,
				   struct block_device *bdev);
2378
extern int revalidate_disk(struct gendisk *);
L
Linus Torvalds 已提交
2379
extern int check_disk_change(struct block_device *);
2380
extern int __invalidate_device(struct block_device *, bool);
L
Linus Torvalds 已提交
2381
extern int invalidate_partition(struct gendisk *, int);
2382
#endif
L
Linus Torvalds 已提交
2383 2384
unsigned long invalidate_mapping_pages(struct address_space *mapping,
					pgoff_t start, pgoff_t end);
2385

L
Linus Torvalds 已提交
2386 2387 2388 2389
static inline void invalidate_remote_inode(struct inode *inode)
{
	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
	    S_ISLNK(inode->i_mode))
2390
		invalidate_mapping_pages(inode->i_mapping, 0, -1);
L
Linus Torvalds 已提交
2391 2392 2393 2394 2395 2396 2397 2398
}
extern int invalidate_inode_pages2(struct address_space *mapping);
extern int invalidate_inode_pages2_range(struct address_space *mapping,
					 pgoff_t start, pgoff_t end);
extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
extern int filemap_fdatawait(struct address_space *);
2399 2400
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
				   loff_t lend);
L
Linus Torvalds 已提交
2401 2402 2403
extern int filemap_write_and_wait(struct address_space *mapping);
extern int filemap_write_and_wait_range(struct address_space *mapping,
				        loff_t lstart, loff_t lend);
2404 2405
extern int __filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end, int sync_mode);
2406 2407
extern int filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end);
2408

2409 2410 2411
extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
			   int datasync);
extern int vfs_fsync(struct file *file, int datasync);
2412
extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
L
Linus Torvalds 已提交
2413 2414
extern void emergency_sync(void);
extern void emergency_remount(void);
2415
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2416
extern sector_t bmap(struct inode *, sector_t);
2417
#endif
L
Linus Torvalds 已提交
2418
extern int notify_change(struct dentry *, struct iattr *);
2419
extern int inode_permission(struct inode *, int);
2420
extern int generic_permission(struct inode *, int);
L
Linus Torvalds 已提交
2421

2422 2423 2424 2425 2426
static inline bool execute_ok(struct inode *inode)
{
	return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
}

2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451
/*
 * get_write_access() gets write permission for a file.
 * put_write_access() releases this write permission.
 * This is used for regular files.
 * We cannot support write (and maybe mmap read-write shared) accesses and
 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
 * can have the following values:
 * 0: no writers, no VM_DENYWRITE mappings
 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
 * > 0: (i_writecount) users are writing to the file.
 *
 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
 * except for the cases where we don't hold i_writecount yet. Then we need to
 * use {get,deny}_write_access() - these functions check the sign and refuse
 * to do the change if sign is wrong.
 */
static inline int get_write_access(struct inode *inode)
{
	return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
}
static inline int deny_write_access(struct file *file)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
}
L
Linus Torvalds 已提交
2452 2453 2454 2455 2456 2457 2458
static inline void put_write_access(struct inode * inode)
{
	atomic_dec(&inode->i_writecount);
}
static inline void allow_write_access(struct file *file)
{
	if (file)
2459
		atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
L
Linus Torvalds 已提交
2460
}
M
Mimi Zohar 已提交
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
#ifdef CONFIG_IMA
static inline void i_readcount_dec(struct inode *inode)
{
	BUG_ON(!atomic_read(&inode->i_readcount));
	atomic_dec(&inode->i_readcount);
}
static inline void i_readcount_inc(struct inode *inode)
{
	atomic_inc(&inode->i_readcount);
}
#else
static inline void i_readcount_dec(struct inode *inode)
{
	return;
}
static inline void i_readcount_inc(struct inode *inode)
{
	return;
}
#endif
U
Ulrich Drepper 已提交
2481
extern int do_pipe_flags(int *, int);
L
Linus Torvalds 已提交
2482

M
Mimi Zohar 已提交
2483
extern int kernel_read(struct file *, loff_t, char *, unsigned long);
L
Linus Torvalds 已提交
2484 2485 2486 2487
extern struct file * open_exec(const char *);
 
/* fs/dcache.c -- generic fs support functions */
extern int is_subdir(struct dentry *, struct dentry *);
2488
extern int path_is_under(struct path *, struct path *);
L
Linus Torvalds 已提交
2489 2490 2491 2492 2493 2494 2495 2496 2497
extern ino_t find_inode_number(struct dentry *, struct qstr *);

#include <linux/err.h>

/* needed for stackable file system support */
extern loff_t default_llseek(struct file *file, loff_t offset, int origin);

extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);

2498
extern int inode_init_always(struct super_block *, struct inode *);
L
Linus Torvalds 已提交
2499
extern void inode_init_once(struct inode *);
2500
extern void address_space_init_once(struct address_space *mapping);
A
Al Viro 已提交
2501
extern void ihold(struct inode * inode);
L
Linus Torvalds 已提交
2502 2503 2504 2505
extern void iput(struct inode *);
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
extern int inode_needs_sync(struct inode *inode);
2506
extern int generic_delete_inode(struct inode *inode);
2507 2508 2509 2510
static inline int generic_drop_inode(struct inode *inode)
{
	return !inode->i_nlink || inode_unhashed(inode);
}
L
Linus Torvalds 已提交
2511

2512 2513 2514
extern struct inode *ilookup5_nowait(struct super_block *sb,
		unsigned long hashval, int (*test)(struct inode *, void *),
		void *data);
L
Linus Torvalds 已提交
2515 2516 2517 2518 2519 2520
extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
		int (*test)(struct inode *, void *), void *data);
extern struct inode *ilookup(struct super_block *sb, unsigned long ino);

extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
extern struct inode * iget_locked(struct super_block *, unsigned long);
A
Al Viro 已提交
2521 2522
extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
extern int insert_inode_locked(struct inode *);
2523 2524 2525 2526 2527
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
#else
static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
#endif
L
Linus Torvalds 已提交
2528
extern void unlock_new_inode(struct inode *);
2529
extern unsigned int get_next_ino(void);
L
Linus Torvalds 已提交
2530 2531

extern void __iget(struct inode * inode);
2532
extern void iget_failed(struct inode *);
2533
extern void clear_inode(struct inode *);
C
Christoph Hellwig 已提交
2534
extern void __destroy_inode(struct inode *);
2535 2536
extern struct inode *new_inode_pseudo(struct super_block *sb);
extern struct inode *new_inode(struct super_block *sb);
2537
extern void free_inode_nonrcu(struct inode *inode);
2538
extern int should_remove_suid(struct dentry *);
2539
extern int file_remove_suid(struct file *);
L
Linus Torvalds 已提交
2540 2541

extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2542 2543
static inline void insert_inode_hash(struct inode *inode)
{
L
Linus Torvalds 已提交
2544 2545
	__insert_inode_hash(inode, inode->i_ino);
}
2546 2547 2548 2549 2550 2551 2552 2553

extern void __remove_inode_hash(struct inode *);
static inline void remove_inode_hash(struct inode *inode)
{
	if (!inode_unhashed(inode))
		__remove_inode_hash(inode);
}

2554
extern void inode_sb_list_add(struct inode *inode);
L
Linus Torvalds 已提交
2555

2556
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2557 2558
extern void submit_bio(int, struct bio *);
extern int bdev_read_only(struct block_device *);
2559
#endif
L
Linus Torvalds 已提交
2560 2561 2562 2563 2564 2565
extern int set_blocksize(struct block_device *, int);
extern int sb_set_blocksize(struct super_block *, int);
extern int sb_min_blocksize(struct super_block *, int);

extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2566 2567
extern int generic_file_remap_pages(struct vm_area_struct *, unsigned long addr,
		unsigned long size, pgoff_t pgoff);
L
Linus Torvalds 已提交
2568 2569
extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
2570
extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2571 2572
extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
		loff_t *);
2573
extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
L
Linus Torvalds 已提交
2574 2575 2576 2577 2578 2579
extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
		unsigned long *, loff_t, loff_t *, size_t, size_t);
extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
		unsigned long, loff_t, loff_t *, size_t, ssize_t);
extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2580 2581
extern int generic_segment_checks(const struct iovec *iov,
		unsigned long *nr_segs, size_t *count, int access_flags);
A
Andrew Morton 已提交
2582

2583
/* fs/block_dev.c */
2584 2585
extern ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov,
			       unsigned long nr_segs, loff_t pos);
2586 2587
extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos);
2588 2589
extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
			int datasync);
A
Al Viro 已提交
2590
extern void block_sync_page(struct page *page);
2591

A
Andrew Morton 已提交
2592
/* fs/splice.c */
2593
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
A
Andrew Morton 已提交
2594
		struct pipe_inode_info *, size_t, unsigned int);
2595 2596
extern ssize_t default_file_splice_read(struct file *, loff_t *,
		struct pipe_inode_info *, size_t, unsigned int);
A
Andrew Morton 已提交
2597
extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2598
		struct file *, loff_t *, size_t, unsigned int);
A
Andrew Morton 已提交
2599
extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2600 2601
		struct file *out, loff_t *, size_t len, unsigned int flags);
extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
A
Andrew Morton 已提交
2602 2603
		size_t len, unsigned int flags);

L
Linus Torvalds 已提交
2604 2605
extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
J
jan Blunck 已提交
2606
extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
L
Linus Torvalds 已提交
2607 2608
extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
A
Andi Kleen 已提交
2609
extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
2610
		int origin, loff_t maxsize, loff_t eof);
L
Linus Torvalds 已提交
2611 2612 2613
extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);

2614
#ifdef CONFIG_FS_XIP
2615 2616
extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
			     loff_t *ppos);
2617
extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2618 2619
extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
			      size_t len, loff_t *ppos);
2620
extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2621 2622 2623 2624 2625
#else
static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
{
	return 0;
}
2626 2627
#endif

2628
#ifdef CONFIG_BLOCK
2629 2630
typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
			    loff_t file_offset);
L
Linus Torvalds 已提交
2631 2632

enum {
2633 2634 2635 2636 2637
	/* need locking between buffered and direct access */
	DIO_LOCKING	= 0x01,

	/* filesystem does not support filling holes */
	DIO_SKIP_HOLES	= 0x02,
L
Linus Torvalds 已提交
2638 2639
};

2640 2641 2642 2643 2644 2645
void dio_end_io(struct bio *bio, int error);

ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
	struct block_device *bdev, const struct iovec *iov, loff_t offset,
	unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
	dio_submit_t submit_io,	int flags);
2646

L
Linus Torvalds 已提交
2647
static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2648 2649
		struct inode *inode, const struct iovec *iov, loff_t offset,
		unsigned long nr_segs, get_block_t get_block)
L
Linus Torvalds 已提交
2650
{
2651 2652
	return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
				    offset, nr_segs, get_block, NULL, NULL,
2653
				    DIO_LOCKING | DIO_SKIP_HOLES);
L
Linus Torvalds 已提交
2654
}
2655
#endif
L
Linus Torvalds 已提交
2656

2657 2658 2659
void inode_dio_wait(struct inode *inode);
void inode_dio_done(struct inode *inode);

2660
extern const struct file_operations generic_ro_fops;
L
Linus Torvalds 已提交
2661 2662 2663 2664 2665 2666

#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))

extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
extern int vfs_follow_link(struct nameidata *, const char *);
extern int page_readlink(struct dentry *, char __user *, int);
2667 2668
extern void *page_follow_link_light(struct dentry *, struct nameidata *);
extern void page_put_link(struct dentry *, struct nameidata *, void *);
2669
extern int __page_symlink(struct inode *inode, const char *symname, int len,
2670
		int nofs);
L
Linus Torvalds 已提交
2671
extern int page_symlink(struct inode *inode, const char *symname, int len);
2672
extern const struct inode_operations page_symlink_inode_operations;
L
Linus Torvalds 已提交
2673 2674 2675
extern int generic_readlink(struct dentry *, char __user *, int);
extern void generic_fillattr(struct inode *, struct kstat *);
extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2676
void __inode_add_bytes(struct inode *inode, loff_t bytes);
L
Linus Torvalds 已提交
2677 2678 2679 2680 2681 2682 2683
void inode_add_bytes(struct inode *inode, loff_t bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes);
loff_t inode_get_bytes(struct inode *inode);
void inode_set_bytes(struct inode *inode, loff_t bytes);

extern int vfs_readdir(struct file *, filldir_t, void *);

2684 2685
extern int vfs_stat(const char __user *, struct kstat *);
extern int vfs_lstat(const char __user *, struct kstat *);
L
Linus Torvalds 已提交
2686
extern int vfs_fstat(unsigned int, struct kstat *);
2687
extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
L
Linus Torvalds 已提交
2688

2689 2690
extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
		    unsigned long arg);
2691
extern int __generic_block_fiemap(struct inode *inode,
J
Josef Bacik 已提交
2692 2693 2694
				  struct fiemap_extent_info *fieinfo,
				  loff_t start, loff_t len,
				  get_block_t *get_block);
2695 2696 2697
extern int generic_block_fiemap(struct inode *inode,
				struct fiemap_extent_info *fieinfo, u64 start,
				u64 len, get_block_t *get_block);
L
Linus Torvalds 已提交
2698

2699 2700
extern void get_filesystem(struct file_system_type *fs);
extern void put_filesystem(struct file_system_type *fs);
L
Linus Torvalds 已提交
2701 2702
extern struct file_system_type *get_fs_type(const char *name);
extern struct super_block *get_super(struct block_device *);
2703
extern struct super_block *get_super_thawed(struct block_device *);
2704
extern struct super_block *get_active_super(struct block_device *bdev);
L
Linus Torvalds 已提交
2705
extern void drop_super(struct super_block *sb);
A
Al Viro 已提交
2706
extern void iterate_supers(void (*)(struct super_block *, void *), void *);
A
Al Viro 已提交
2707 2708
extern void iterate_supers_type(struct file_system_type *,
			        void (*)(struct super_block *, void *), void *);
L
Linus Torvalds 已提交
2709 2710 2711 2712 2713

extern int dcache_dir_open(struct inode *, struct file *);
extern int dcache_dir_close(struct inode *, struct file *);
extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
extern int dcache_readdir(struct file *, void *, filldir_t);
2714
extern int simple_setattr(struct dentry *, struct iattr *);
L
Linus Torvalds 已提交
2715
extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2716
extern int simple_statfs(struct dentry *, struct kstatfs *);
S
Stephen Boyd 已提交
2717
extern int simple_open(struct inode *inode, struct file *file);
L
Linus Torvalds 已提交
2718 2719 2720 2721
extern int simple_link(struct dentry *, struct inode *, struct dentry *);
extern int simple_unlink(struct inode *, struct dentry *);
extern int simple_rmdir(struct inode *, struct dentry *);
extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2722
extern int noop_fsync(struct file *, loff_t, loff_t, int);
L
Linus Torvalds 已提交
2723 2724
extern int simple_empty(struct dentry *);
extern int simple_readpage(struct file *file, struct page *page);
2725 2726 2727 2728 2729 2730
extern int simple_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata);
extern int simple_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata);
L
Linus Torvalds 已提交
2731

A
Al Viro 已提交
2732
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
L
Linus Torvalds 已提交
2733
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2734
extern const struct file_operations simple_dir_operations;
2735
extern const struct inode_operations simple_dir_inode_operations;
2736
struct tree_descr { char *name; const struct file_operations *ops; int mode; };
L
Linus Torvalds 已提交
2737
struct dentry *d_alloc_name(struct dentry *, const char *);
2738
extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2739
extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
L
Linus Torvalds 已提交
2740 2741
extern void simple_release_fs(struct vfsmount **mount, int *count);

2742 2743
extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
			loff_t *ppos, const void *from, size_t available);
2744 2745
extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
		const void __user *from, size_t count);
L
Linus Torvalds 已提交
2746

2747
extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
A
Al Viro 已提交
2748

2749 2750
extern int generic_check_addressable(unsigned, u64);

2751
#ifdef CONFIG_MIGRATION
2752
extern int buffer_migrate_page(struct address_space *,
2753 2754
				struct page *, struct page *,
				enum migrate_mode);
2755 2756 2757 2758
#else
#define buffer_migrate_page NULL
#endif

N
npiggin@suse.de 已提交
2759 2760
extern int inode_change_ok(const struct inode *, struct iattr *);
extern int inode_newsize_ok(const struct inode *, loff_t offset);
C
Christoph Hellwig 已提交
2761
extern void setattr_copy(struct inode *inode, const struct iattr *attr);
L
Linus Torvalds 已提交
2762

2763
extern int file_update_time(struct file *file);
L
Linus Torvalds 已提交
2764

2765
extern int generic_show_options(struct seq_file *m, struct dentry *root);
2766
extern void save_mount_options(struct super_block *sb, char *options);
2767
extern void replace_mount_options(struct super_block *sb, char *options);
2768

L
Linus Torvalds 已提交
2769 2770 2771 2772
static inline ino_t parent_ino(struct dentry *dentry)
{
	ino_t res;

N
Nick Piggin 已提交
2773 2774 2775 2776
	/*
	 * Don't strictly need d_lock here? If the parent ino could change
	 * then surely we'd have a deeper race in the caller?
	 */
L
Linus Torvalds 已提交
2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801
	spin_lock(&dentry->d_lock);
	res = dentry->d_parent->d_inode->i_ino;
	spin_unlock(&dentry->d_lock);
	return res;
}

/* Transaction based IO helpers */

/*
 * An argresp is stored in an allocated page and holds the
 * size of the argument or response, along with its content
 */
struct simple_transaction_argresp {
	ssize_t size;
	char data[0];
};

#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))

char *simple_transaction_get(struct file *file, const char __user *buf,
				size_t size);
ssize_t simple_transaction_read(struct file *file, char __user *buf,
				size_t size, loff_t *pos);
int simple_transaction_release(struct inode *inode, struct file *file);

2802
void simple_transaction_set(struct file *file, size_t n);
L
Linus Torvalds 已提交
2803

2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825
/*
 * simple attribute files
 *
 * These attributes behave similar to those in sysfs:
 *
 * Writing to an attribute immediately sets a value, an open file can be
 * written to multiple times.
 *
 * Reading from an attribute creates a buffer from the value that might get
 * read with multiple read calls. When the attribute has been read
 * completely, no further read calls are possible until the file is opened
 * again.
 *
 * All attributes contain a text representation of a numeric value
 * that are accessed with the get() and set() functions.
 */
#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)		\
static int __fops ## _open(struct inode *inode, struct file *file)	\
{									\
	__simple_attr_check_format(__fmt, 0ull);			\
	return simple_attr_open(inode, file, __get, __set, __fmt);	\
}									\
2826
static const struct file_operations __fops = {				\
2827 2828
	.owner	 = THIS_MODULE,						\
	.open	 = __fops ## _open,					\
2829
	.release = simple_attr_release,					\
2830 2831
	.read	 = simple_attr_read,					\
	.write	 = simple_attr_write,					\
2832
	.llseek	 = generic_file_llseek,					\
2833 2834
};

2835 2836
static inline __printf(1, 2)
void __simple_attr_check_format(const char *fmt, ...)
2837 2838 2839 2840 2841
{
	/* don't do anything, just let the compiler check the arguments; */
}

int simple_attr_open(struct inode *inode, struct file *file,
2842
		     int (*get)(void *, u64 *), int (*set)(void *, u64),
2843
		     const char *fmt);
2844
int simple_attr_release(struct inode *inode, struct file *file);
2845 2846 2847 2848 2849
ssize_t simple_attr_read(struct file *file, char __user *buf,
			 size_t len, loff_t *ppos);
ssize_t simple_attr_write(struct file *file, const char __user *buf,
			  size_t len, loff_t *ppos);

A
Alexey Dobriyan 已提交
2850
struct ctl_table;
2851
int proc_nr_files(struct ctl_table *table, int write,
2852
		  void __user *buffer, size_t *lenp, loff_t *ppos);
2853 2854
int proc_nr_dentry(struct ctl_table *table, int write,
		  void __user *buffer, size_t *lenp, loff_t *ppos);
2855 2856
int proc_nr_inodes(struct ctl_table *table, int write,
		   void __user *buffer, size_t *lenp, loff_t *ppos);
2857
int __init get_filesystem_list(char *buf);
2858

N
Namhyung Kim 已提交
2859
#define __FMODE_EXEC		((__force int) FMODE_EXEC)
2860 2861
#define __FMODE_NONOTIFY	((__force int) FMODE_NONOTIFY)

A
Al Viro 已提交
2862
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
E
Eric Paris 已提交
2863
#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2864
					    (flag & __FMODE_NONOTIFY)))
A
Al Viro 已提交
2865

A
Al Viro 已提交
2866
static inline int is_sxid(umode_t mode)
2867 2868 2869 2870 2871 2872
{
	return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
}

static inline void inode_has_no_xattr(struct inode *inode)
{
A
Al Viro 已提交
2873
	if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
2874 2875 2876
		inode->i_flags |= S_NOSEC;
}

L
Linus Torvalds 已提交
2877 2878
#endif /* __KERNEL__ */
#endif /* _LINUX_FS_H */