1 #ifndef _LINUX_FS_H 2 #define _LINUX_FS_H 3 4 /* 5 * This file has definitions for some important file table 6 * structures etc. 7 */ 8 9 #include <linux/limits.h> 10 #include <linux/ioctl.h> 11 #include <linux/blk_types.h> 12 #include <linux/types.h> 13 14 /* 15 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change 16 * the file limit at runtime and only root can increase the per-process 17 * nr_file rlimit, so it's safe to set up a ridiculously high absolute 18 * upper limit on files-per-process. 19 * 20 * Some programs (notably those using select()) may have to be 21 * recompiled to take full advantage of the new limits.. 22 */ 23 24 /* Fixed constants first: */ 25 #undef NR_OPEN 26 #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */ 27 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ 28 29 #define BLOCK_SIZE_BITS 10 30 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 31 32 #define SEEK_SET 0 /* seek relative to beginning of file */ 33 #define SEEK_CUR 1 /* seek relative to current file position */ 34 #define SEEK_END 2 /* seek relative to end of file */ 35 #define SEEK_DATA 3 /* seek to the next data */ 36 #define SEEK_HOLE 4 /* seek to the next hole */ 37 #define SEEK_MAX SEEK_HOLE 38 39 struct fstrim_range { 40 __u64 start; 41 __u64 len; 42 __u64 minlen; 43 }; 44 45 /* And dynamically-tunable limits and defaults: */ 46 struct files_stat_struct { 47 unsigned long nr_files; /* read only */ 48 unsigned long nr_free_files; /* read only */ 49 unsigned long max_files; /* tunable */ 50 }; 51 52 struct inodes_stat_t { 53 int nr_inodes; 54 int nr_unused; 55 int dummy[5]; /* padding for sysctl ABI compatibility */ 56 }; 57 58 59 #define NR_FILE 8192 /* this can well be larger on a larger system */ 60 61 #define MAY_EXEC 0x00000001 62 #define MAY_WRITE 0x00000002 63 #define MAY_READ 0x00000004 64 #define MAY_APPEND 0x00000008 65 #define MAY_ACCESS 0x00000010 66 #define MAY_OPEN 0x00000020 67 #define MAY_CHDIR 0x00000040 68 /* called from RCU mode, don't block */ 69 #define MAY_NOT_BLOCK 0x00000080 70 71 /* 72 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond 73 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() 74 */ 75 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 /* File is opened using open(.., 3, ..) and is writeable only for ioctls 93 (specialy hack for floppy.c) */ 94 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) 95 /* 32bit hashes as llseek() offset (for directories) */ 96 #define FMODE_32BITHASH ((__force fmode_t)0x200) 97 /* 64bit hashes as llseek() offset (for directories) */ 98 #define FMODE_64BITHASH ((__force fmode_t)0x400) 99 100 /* 101 * Don't update ctime and mtime. 102 * 103 * Currently a special hack for the XFS open_by_handle ioctl, but we'll 104 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. 105 */ 106 #define FMODE_NOCMTIME ((__force fmode_t)0x800) 107 108 /* Expect random access pattern */ 109 #define FMODE_RANDOM ((__force fmode_t)0x1000) 110 111 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ 112 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) 113 114 /* File is opened with O_PATH; almost nothing can be done with it */ 115 #define FMODE_PATH ((__force fmode_t)0x4000) 116 117 /* File was opened by fanotify and shouldn't generate fanotify events */ 118 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) 119 120 /* 121 * The below are the various read and write types that we support. Some of 122 * them include behavioral modifiers that send information down to the 123 * block layer and IO scheduler. Terminology: 124 * 125 * The block layer uses device plugging to defer IO a little bit, in 126 * the hope that we will see more IO very shortly. This increases 127 * coalescing of adjacent IO and thus reduces the number of IOs we 128 * have to send to the device. It also allows for better queuing, 129 * if the IO isn't mergeable. If the caller is going to be waiting 130 * for the IO, then he must ensure that the device is unplugged so 131 * that the IO is dispatched to the driver. 132 * 133 * All IO is handled async in Linux. This is fine for background 134 * writes, but for reads or writes that someone waits for completion 135 * on, we want to notify the block layer and IO scheduler so that they 136 * know about it. That allows them to make better scheduling 137 * decisions. So when the below references 'sync' and 'async', it 138 * is referencing this priority hint. 139 * 140 * With that in mind, the available types are: 141 * 142 * READ A normal read operation. Device will be plugged. 143 * READ_SYNC A synchronous read. Device is not plugged, caller can 144 * immediately wait on this read without caring about 145 * unplugging. 146 * READA Used for read-ahead operations. Lower priority, and the 147 * block layer could (in theory) choose to ignore this 148 * request if it runs into resource problems. 149 * WRITE A normal async write. Device will be plugged. 150 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down 151 * the hint that someone will be waiting on this IO 152 * shortly. The write equivalent of READ_SYNC. 153 * WRITE_ODIRECT Special case write for O_DIRECT only. 154 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. 155 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on 156 * non-volatile media on completion. 157 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded 158 * by a cache flush and data is guaranteed to be on 159 * non-volatile media on completion. 160 * 161 */ 162 #define RW_MASK REQ_WRITE 163 #define RWA_MASK REQ_RAHEAD 164 165 #define READ 0 166 #define WRITE RW_MASK 167 #define READA RWA_MASK 168 169 #define READ_SYNC (READ | REQ_SYNC) 170 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) 171 #define WRITE_ODIRECT (WRITE | REQ_SYNC) 172 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) 173 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) 174 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) 175 176 #define SEL_IN 1 177 #define SEL_OUT 2 178 #define SEL_EX 4 179 180 /* public flags for file_system_type */ 181 #define FS_REQUIRES_DEV 1 182 #define FS_BINARY_MOUNTDATA 2 183 #define FS_HAS_SUBTYPE 4 184 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ 185 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() 186 * during rename() internally. 187 */ 188 189 /* 190 * These are the fs-independent mount-flags: up to 32 flags are supported 191 */ 192 #define MS_RDONLY 1 /* Mount read-only */ 193 #define MS_NOSUID 2 /* Ignore suid and sgid bits */ 194 #define MS_NODEV 4 /* Disallow access to device special files */ 195 #define MS_NOEXEC 8 /* Disallow program execution */ 196 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 197 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 198 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 199 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 200 #define MS_NOATIME 1024 /* Do not update access times. */ 201 #define MS_NODIRATIME 2048 /* Do not update directory access times */ 202 #define MS_BIND 4096 203 #define MS_MOVE 8192 204 #define MS_REC 16384 205 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 206 MS_VERBOSE is deprecated. */ 207 #define MS_SILENT 32768 208 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 209 #define MS_UNBINDABLE (1<<17) /* change to unbindable */ 210 #define MS_PRIVATE (1<<18) /* change to private */ 211 #define MS_SLAVE (1<<19) /* change to slave */ 212 #define MS_SHARED (1<<20) /* change to shared */ 213 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ 214 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ 215 #define MS_I_VERSION (1<<23) /* Update inode I_version field */ 216 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ 217 #define MS_NOSEC (1<<28) 218 #define MS_BORN (1<<29) 219 #define MS_ACTIVE (1<<30) 220 #define MS_NOUSER (1<<31) 221 222 /* 223 * Superblock flags that can be altered by MS_REMOUNT 224 */ 225 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) 226 227 /* 228 * Old magic mount flag and mask 229 */ 230 #define MS_MGC_VAL 0xC0ED0000 231 #define MS_MGC_MSK 0xffff0000 232 233 /* Inode flags - they have nothing to superblock flags now */ 234 235 #define S_SYNC 1 /* Writes are synced at once */ 236 #define S_NOATIME 2 /* Do not update access times */ 237 #define S_APPEND 4 /* Append-only file */ 238 #define S_IMMUTABLE 8 /* Immutable file */ 239 #define S_DEAD 16 /* removed, but still open directory */ 240 #define S_NOQUOTA 32 /* Inode is not counted to quota */ 241 #define S_DIRSYNC 64 /* Directory modifications are synchronous */ 242 #define S_NOCMTIME 128 /* Do not update file c/mtime */ 243 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ 244 #define S_PRIVATE 512 /* Inode is fs-internal */ 245 #define S_IMA 1024 /* Inode has an associated IMA struct */ 246 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ 247 #define S_NOSEC 4096 /* no suid or xattr security attributes */ 248 249 /* 250 * Note that nosuid etc flags are inode-specific: setting some file-system 251 * flags just means all the inodes inherit those flags by default. It might be 252 * possible to override it selectively if you really wanted to with some 253 * ioctl() that is not currently implemented. 254 * 255 * Exception: MS_RDONLY is always applied to the entire file system. 256 * 257 * Unfortunately, it is possible to change a filesystems flags with it mounted 258 * with files in use. This means that all of the inodes will not have their 259 * i_flags updated. Hence, i_flags no longer inherit the superblock mount 260 * flags, so these have to be checked separately. -- rmk (at) arm.uk.linux.org 261 */ 262 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) 263 264 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) 265 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ 266 ((inode)->i_flags & S_SYNC)) 267 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ 268 ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) 269 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) 270 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) 271 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) 272 273 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) 274 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) 275 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) 276 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) 277 278 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) 279 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) 280 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) 281 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) 282 #define IS_IMA(inode) ((inode)->i_flags & S_IMA) 283 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) 284 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) 285 286 /* the read-only stuff doesn't really belong here, but any other place is 287 probably as bad and I don't want to create yet another include file. */ 288 289 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 290 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 291 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 292 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 293 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 294 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 295 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 296 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 297 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 298 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 299 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 300 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 301 #if 0 302 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 303 304 /* Some people are morons. Do not use sizeof! */ 305 306 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 307 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 308 /* This was here just to show that the number is taken - 309 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 310 #endif 311 /* A jump here: 108-111 have been used for various private purposes. */ 312 #define BLKBSZGET _IOR(0x12,112,size_t) 313 #define BLKBSZSET _IOW(0x12,113,size_t) 314 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 315 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 316 #define BLKTRACESTART _IO(0x12,116) 317 #define BLKTRACESTOP _IO(0x12,117) 318 #define BLKTRACETEARDOWN _IO(0x12,118) 319 #define BLKDISCARD _IO(0x12,119) 320 #define BLKIOMIN _IO(0x12,120) 321 #define BLKIOOPT _IO(0x12,121) 322 #define BLKALIGNOFF _IO(0x12,122) 323 #define BLKPBSZGET _IO(0x12,123) 324 #define BLKDISCARDZEROES _IO(0x12,124) 325 #define BLKSECDISCARD _IO(0x12,125) 326 #define BLKROTATIONAL _IO(0x12,126) 327 328 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 329 #define FIBMAP _IO(0x00,1) /* bmap access */ 330 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 331 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 332 #define FITHAW _IOWR('X', 120, int) /* Thaw */ 333 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 334 335 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 336 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 337 #define FS_IOC_GETVERSION _IOR('v', 1, long) 338 #define FS_IOC_SETVERSION _IOW('v', 2, long) 339 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 340 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 341 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 342 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 343 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 344 345 /* 346 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 347 */ 348 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 349 #define FS_UNRM_FL 0x00000002 /* Undelete */ 350 #define FS_COMPR_FL 0x00000004 /* Compress file */ 351 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 352 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 353 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 354 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 355 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 356 /* Reserved for compression usage... */ 357 #define FS_DIRTY_FL 0x00000100 358 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 359 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 360 #define FS_ECOMPR_FL 0x00000800 /* Compression error */ 361 /* End compression flags --- maybe not all used */ 362 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 363 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 364 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 365 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 366 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 367 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 368 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 369 #define FS_EXTENT_FL 0x00080000 /* Extents */ 370 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ 371 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 372 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 373 374 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 375 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 376 377 378 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 379 #define SYNC_FILE_RANGE_WRITE 2 380 #define SYNC_FILE_RANGE_WAIT_AFTER 4 381 382 #ifdef __KERNEL__ 383 384 #include <linux/linkage.h> 385 #include <linux/wait.h> 386 #include <linux/kdev_t.h> 387 #include <linux/dcache.h> 388 #include <linux/path.h> 389 #include <linux/stat.h> 390 #include <linux/cache.h> 391 #include <linux/list.h> 392 #include <linux/radix-tree.h> 393 #include <linux/prio_tree.h> 394 #include <linux/init.h> 395 #include <linux/pid.h> 396 #include <linux/bug.h> 397 #include <linux/mutex.h> 398 #include <linux/capability.h> 399 #include <linux/semaphore.h> 400 #include <linux/fiemap.h> 401 #include <linux/rculist_bl.h> 402 #include <linux/atomic.h> 403 #include <linux/shrinker.h> 404 #include <linux/migrate_mode.h> 405 406 #include <asm/byteorder.h> 407 408 struct export_operations; 409 struct hd_geometry; 410 struct iovec; 411 struct nameidata; 412 struct kiocb; 413 struct kobject; 414 struct pipe_inode_info; 415 struct poll_table_struct; 416 struct kstatfs; 417 struct vm_area_struct; 418 struct vfsmount; 419 struct cred; 420 421 extern void __init inode_init(void); 422 extern void __init inode_init_early(void); 423 extern void __init files_init(unsigned long); 424 425 extern struct files_stat_struct files_stat; 426 extern unsigned long get_max_files(void); 427 extern int sysctl_nr_open; 428 extern struct inodes_stat_t inodes_stat; 429 extern int leases_enable, lease_break_time; 430 431 struct buffer_head; 432 typedef int (get_block_t)(struct inode *inode, sector_t iblock, 433 struct buffer_head *bh_result, int create); 434 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, 435 ssize_t bytes, void *private, int ret, 436 bool is_async); 437 438 /* 439 * Attribute flags. These should be or-ed together to figure out what 440 * has been changed! 441 */ 442 #define ATTR_MODE (1 << 0) 443 #define ATTR_UID (1 << 1) 444 #define ATTR_GID (1 << 2) 445 #define ATTR_SIZE (1 << 3) 446 #define ATTR_ATIME (1 << 4) 447 #define ATTR_MTIME (1 << 5) 448 #define ATTR_CTIME (1 << 6) 449 #define ATTR_ATIME_SET (1 << 7) 450 #define ATTR_MTIME_SET (1 << 8) 451 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ 452 #define ATTR_ATTR_FLAG (1 << 10) 453 #define ATTR_KILL_SUID (1 << 11) 454 #define ATTR_KILL_SGID (1 << 12) 455 #define ATTR_FILE (1 << 13) 456 #define ATTR_KILL_PRIV (1 << 14) 457 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ 458 #define ATTR_TIMES_SET (1 << 16) 459 460 /* 461 * This is the Inode Attributes structure, used for notify_change(). It 462 * uses the above definitions as flags, to know which values have changed. 463 * Also, in this manner, a Filesystem can look at only the values it cares 464 * about. Basically, these are the attributes that the VFS layer can 465 * request to change from the FS layer. 466 * 467 * Derek Atkins <warlord (at) MIT.EDU> 94-10-20 468 */ 469 struct iattr { 470 unsigned int ia_valid; 471 umode_t ia_mode; 472 uid_t ia_uid; 473 gid_t ia_gid; 474 loff_t ia_size; 475 struct timespec ia_atime; 476 struct timespec ia_mtime; 477 struct timespec ia_ctime; 478 479 /* 480 * Not an attribute, but an auxiliary info for filesystems wanting to 481 * implement an ftruncate() like method. NOTE: filesystem should 482 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). 483 */ 484 struct file *ia_file; 485 }; 486 487 /* 488 * Includes for diskquotas. 489 */ 490 #include <linux/quota.h> 491 492 /** 493 * enum positive_aop_returns - aop return codes with specific semantics 494 * 495 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has 496 * completed, that the page is still locked, and 497 * should be considered active. The VM uses this hint 498 * to return the page to the active list -- it won't 499 * be a candidate for writeback again in the near 500 * future. Other callers must be careful to unlock 501 * the page if they get this return. Returned by 502 * writepage(); 503 * 504 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has 505 * unlocked it and the page might have been truncated. 506 * The caller should back up to acquiring a new page and 507 * trying again. The aop will be taking reasonable 508 * precautions not to livelock. If the caller held a page 509 * reference, it should drop it before retrying. Returned 510 * by readpage(). 511 * 512 * address_space_operation functions return these large constants to indicate 513 * special semantics to the caller. These are much larger than the bytes in a 514 * page to allow for functions that return the number of bytes operated on in a 515 * given page. 516 */ 517 518 enum positive_aop_returns { 519 AOP_WRITEPAGE_ACTIVATE = 0x80000, 520 AOP_TRUNCATED_PAGE = 0x80001, 521 }; 522 523 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ 524 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ 525 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct 526 * helper code (eg buffer layer) 527 * to clear GFP_FS from alloc */ 528 529 /* 530 * oh the beauties of C type declarations. 531 */ 532 struct page; 533 struct address_space; 534 struct writeback_control; 535 536 struct iov_iter { 537 const struct iovec *iov; 538 unsigned long nr_segs; 539 size_t iov_offset; 540 size_t count; 541 }; 542 543 size_t iov_iter_copy_from_user_atomic(struct page *page, 544 struct iov_iter *i, unsigned long offset, size_t bytes); 545 size_t iov_iter_copy_from_user(struct page *page, 546 struct iov_iter *i, unsigned long offset, size_t bytes); 547 void iov_iter_advance(struct iov_iter *i, size_t bytes); 548 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); 549 size_t iov_iter_single_seg_count(struct iov_iter *i); 550 551 static inline void iov_iter_init(struct iov_iter *i, 552 const struct iovec *iov, unsigned long nr_segs, 553 size_t count, size_t written) 554 { 555 i->iov = iov; 556 i->nr_segs = nr_segs; 557 i->iov_offset = 0; 558 i->count = count + written; 559 560 iov_iter_advance(i, written); 561 } 562 563 static inline size_t iov_iter_count(struct iov_iter *i) 564 { 565 return i->count; 566 } 567 568 /* 569 * "descriptor" for what we're up to with a read. 570 * This allows us to use the same read code yet 571 * have multiple different users of the data that 572 * we read from a file. 573 * 574 * The simplest case just copies the data to user 575 * mode. 576 */ 577 typedef struct { 578 size_t written; 579 size_t count; 580 union { 581 char __user *buf; 582 void *data; 583 } arg; 584 int error; 585 } read_descriptor_t; 586 587 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, 588 unsigned long, unsigned long); 589 590 struct address_space_operations { 591 int (*writepage)(struct page *page, struct writeback_control *wbc); 592 int (*readpage)(struct file *, struct page *); 593 594 /* Write back some dirty pages from this mapping. */ 595 int (*writepages)(struct address_space *, struct writeback_control *); 596 597 /* Set a page dirty. Return true if this dirtied it */ 598 int (*set_page_dirty)(struct page *page); 599 600 int (*readpages)(struct file *filp, struct address_space *mapping, 601 struct list_head *pages, unsigned nr_pages); 602 603 int (*write_begin)(struct file *, struct address_space *mapping, 604 loff_t pos, unsigned len, unsigned flags, 605 struct page **pagep, void **fsdata); 606 int (*write_end)(struct file *, struct address_space *mapping, 607 loff_t pos, unsigned len, unsigned copied, 608 struct page *page, void *fsdata); 609 610 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ 611 sector_t (*bmap)(struct address_space *, sector_t); 612 void (*invalidatepage) (struct page *, unsigned long); 613 int (*releasepage) (struct page *, gfp_t); 614 void (*freepage)(struct page *); 615 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, 616 loff_t offset, unsigned long nr_segs); 617 int (*get_xip_mem)(struct address_space *, pgoff_t, int, 618 void **, unsigned long *); 619 /* 620 * migrate the contents of a page to the specified target. If sync 621 * is false, it must not block. 622 */ 623 int (*migratepage) (struct address_space *, 624 struct page *, struct page *, enum migrate_mode); 625 int (*launder_page) (struct page *); 626 int (*is_partially_uptodate) (struct page *, read_descriptor_t *, 627 unsigned long); 628 int (*error_remove_page)(struct address_space *, struct page *); 629 }; 630 631 extern const struct address_space_operations empty_aops; 632 633 /* 634 * pagecache_write_begin/pagecache_write_end must be used by general code 635 * to write into the pagecache. 636 */ 637 int pagecache_write_begin(struct file *, struct address_space *mapping, 638 loff_t pos, unsigned len, unsigned flags, 639 struct page **pagep, void **fsdata); 640 641 int pagecache_write_end(struct file *, struct address_space *mapping, 642 loff_t pos, unsigned len, unsigned copied, 643 struct page *page, void *fsdata); 644 645 struct backing_dev_info; 646 struct address_space { 647 struct inode *host; /* owner: inode, block_device */ 648 struct radix_tree_root page_tree; /* radix tree of all pages */ 649 spinlock_t tree_lock; /* and lock protecting it */ 650 unsigned int i_mmap_writable;/* count VM_SHARED mappings */ 651 struct prio_tree_root i_mmap; /* tree of private and shared mappings */ 652 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ 653 struct mutex i_mmap_mutex; /* protect tree, count, list */ 654 /* Protected by tree_lock together with the radix tree */ 655 unsigned long nrpages; /* number of total pages */ 656 pgoff_t writeback_index;/* writeback starts here */ 657 const struct address_space_operations *a_ops; /* methods */ 658 unsigned long flags; /* error bits/gfp mask */ 659 struct backing_dev_info *backing_dev_info; /* device readahead, etc */ 660 spinlock_t private_lock; /* for use by the address_space */ 661 struct list_head private_list; /* ditto */ 662 struct address_space *assoc_mapping; /* ditto */ 663 } __attribute__((aligned(sizeof(long)))); 664 /* 665 * On most architectures that alignment is already the case; but 666 * must be enforced here for CRIS, to let the least significant bit 667 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. 668 */ 669 struct request_queue; 670 671 struct block_device { 672 dev_t bd_dev; /* not a kdev_t - it's a search key */ 673 int bd_openers; 674 struct inode * bd_inode; /* will die */ 675 struct super_block * bd_super; 676 struct mutex bd_mutex; /* open/close mutex */ 677 struct list_head bd_inodes; 678 void * bd_claiming; 679 void * bd_holder; 680 int bd_holders; 681 bool bd_write_holder; 682 #ifdef CONFIG_SYSFS 683 struct list_head bd_holder_disks; 684 #endif 685 struct block_device * bd_contains; 686 unsigned bd_block_size; 687 struct hd_struct * bd_part; 688 /* number of times partitions within this device have been opened. */ 689 unsigned bd_part_count; 690 int bd_invalidated; 691 struct gendisk * bd_disk; 692 struct request_queue * bd_queue; 693 struct list_head bd_list; 694 /* 695 * Private data. You must have bd_claim'ed the block_device 696 * to use this. NOTE: bd_claim allows an owner to claim 697 * the same device multiple times, the owner must take special 698 * care to not mess up bd_private for that case. 699 */ 700 unsigned long bd_private; 701 702 /* The counter of freeze processes */ 703 int bd_fsfreeze_count; 704 /* Mutex for freeze */ 705 struct mutex bd_fsfreeze_mutex; 706 }; 707 708 /* 709 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache 710 * radix trees 711 */ 712 #define PAGECACHE_TAG_DIRTY 0 713 #define PAGECACHE_TAG_WRITEBACK 1 714 #define PAGECACHE_TAG_TOWRITE 2 715 716 int mapping_tagged(struct address_space *mapping, int tag); 717 718 /* 719 * Might pages of this file be mapped into userspace? 720 */ 721 static inline int mapping_mapped(struct address_space *mapping) 722 { 723 return !prio_tree_empty(&mapping->i_mmap) || 724 !list_empty(&mapping->i_mmap_nonlinear); 725 } 726 727 /* 728 * Might pages of this file have been modified in userspace? 729 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff 730 * marks vma as VM_SHARED if it is shared, and the file was opened for 731 * writing i.e. vma may be mprotected writable even if now readonly. 732 */ 733 static inline int mapping_writably_mapped(struct address_space *mapping) 734 { 735 return mapping->i_mmap_writable != 0; 736 } 737 738 /* 739 * Use sequence counter to get consistent i_size on 32-bit processors. 740 */ 741 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 742 #include <linux/seqlock.h> 743 #define __NEED_I_SIZE_ORDERED 744 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) 745 #else 746 #define i_size_ordered_init(inode) do { } while (0) 747 #endif 748 749 struct posix_acl; 750 #define ACL_NOT_CACHED ((void *)(-1)) 751 752 #define IOP_FASTPERM 0x0001 753 #define IOP_LOOKUP 0x0002 754 #define IOP_NOFOLLOW 0x0004 755 756 /* 757 * Keep mostly read-only and often accessed (especially for 758 * the RCU path lookup and 'stat' data) fields at the beginning 759 * of the 'struct inode' 760 */ 761 struct inode { 762 umode_t i_mode; 763 unsigned short i_opflags; 764 uid_t i_uid; 765 gid_t i_gid; 766 unsigned int i_flags; 767 768 #ifdef CONFIG_FS_POSIX_ACL 769 struct posix_acl *i_acl; 770 struct posix_acl *i_default_acl; 771 #endif 772 773 const struct inode_operations *i_op; 774 struct super_block *i_sb; 775 struct address_space *i_mapping; 776 777 #ifdef CONFIG_SECURITY 778 void *i_security; 779 #endif 780 781 /* Stat data, not accessed from path walking */ 782 unsigned long i_ino; 783 /* 784 * Filesystems may only read i_nlink directly. They shall use the 785 * following functions for modification: 786 * 787 * (set|clear|inc|drop)_nlink 788 * inode_(inc|dec)_link_count 789 */ 790 union { 791 const unsigned int i_nlink; 792 unsigned int __i_nlink; 793 }; 794 dev_t i_rdev; 795 struct timespec i_atime; 796 struct timespec i_mtime; 797 struct timespec i_ctime; 798 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ 799 unsigned short i_bytes; 800 blkcnt_t i_blocks; 801 loff_t i_size; 802 803 #ifdef __NEED_I_SIZE_ORDERED 804 seqcount_t i_size_seqcount; 805 #endif 806 807 /* Misc */ 808 unsigned long i_state; 809 struct mutex i_mutex; 810 811 unsigned long dirtied_when; /* jiffies of first dirtying */ 812 813 struct hlist_node i_hash; 814 struct list_head i_wb_list; /* backing dev IO list */ 815 struct list_head i_lru; /* inode LRU list */ 816 struct list_head i_sb_list; 817 union { 818 struct list_head i_dentry; 819 struct rcu_head i_rcu; 820 }; 821 atomic_t i_count; 822 unsigned int i_blkbits; 823 u64 i_version; 824 atomic_t i_dio_count; 825 atomic_t i_writecount; 826 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ 827 struct file_lock *i_flock; 828 struct address_space i_data; 829 #ifdef CONFIG_QUOTA 830 struct dquot *i_dquot[MAXQUOTAS]; 831 #endif 832 struct list_head i_devices; 833 union { 834 struct pipe_inode_info *i_pipe; 835 struct block_device *i_bdev; 836 struct cdev *i_cdev; 837 }; 838 839 __u32 i_generation; 840 841 #ifdef CONFIG_FSNOTIFY 842 __u32 i_fsnotify_mask; /* all events this inode cares about */ 843 struct hlist_head i_fsnotify_marks; 844 #endif 845 846 #ifdef CONFIG_IMA 847 atomic_t i_readcount; /* struct files open RO */ 848 #endif 849 void *i_private; /* fs or device private pointer */ 850 }; 851 852 static inline int inode_unhashed(struct inode *inode) 853 { 854 return hlist_unhashed(&inode->i_hash); 855 } 856 857 /* 858 * inode->i_mutex nesting subclasses for the lock validator: 859 * 860 * 0: the object of the current VFS operation 861 * 1: parent 862 * 2: child/target 863 * 3: quota file 864 * 865 * The locking order between these classes is 866 * parent -> child -> normal -> xattr -> quota 867 */ 868 enum inode_i_mutex_lock_class 869 { 870 I_MUTEX_NORMAL, 871 I_MUTEX_PARENT, 872 I_MUTEX_CHILD, 873 I_MUTEX_XATTR, 874 I_MUTEX_QUOTA 875 }; 876 877 /* 878 * NOTE: in a 32bit arch with a preemptable kernel and 879 * an UP compile the i_size_read/write must be atomic 880 * with respect to the local cpu (unlike with preempt disabled), 881 * but they don't need to be atomic with respect to other cpus like in 882 * true SMP (so they need either to either locally disable irq around 883 * the read or for example on x86 they can be still implemented as a 884 * cmpxchg8b without the need of the lock prefix). For SMP compiles 885 * and 64bit archs it makes no difference if preempt is enabled or not. 886 */ 887 static inline loff_t i_size_read(const struct inode *inode) 888 { 889 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 890 loff_t i_size; 891 unsigned int seq; 892 893 do { 894 seq = read_seqcount_begin(&inode->i_size_seqcount); 895 i_size = inode->i_size; 896 } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); 897 return i_size; 898 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) 899 loff_t i_size; 900 901 preempt_disable(); 902 i_size = inode->i_size; 903 preempt_enable(); 904 return i_size; 905 #else 906 return inode->i_size; 907 #endif 908 } 909 910 /* 911 * NOTE: unlike i_size_read(), i_size_write() does need locking around it 912 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount 913 * can be lost, resulting in subsequent i_size_read() calls spinning forever. 914 */ 915 static inline void i_size_write(struct inode *inode, loff_t i_size) 916 { 917 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 918 write_seqcount_begin(&inode->i_size_seqcount); 919 inode->i_size = i_size; 920 write_seqcount_end(&inode->i_size_seqcount); 921 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) 922 preempt_disable(); 923 inode->i_size = i_size; 924 preempt_enable(); 925 #else 926 inode->i_size = i_size; 927 #endif 928 } 929 930 static inline unsigned iminor(const struct inode *inode) 931 { 932 return MINOR(inode->i_rdev); 933 } 934 935 static inline unsigned imajor(const struct inode *inode) 936 { 937 return MAJOR(inode->i_rdev); 938 } 939 940 extern struct block_device *I_BDEV(struct inode *inode); 941 942 struct fown_struct { 943 rwlock_t lock; /* protects pid, uid, euid fields */ 944 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ 945 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ 946 uid_t uid, euid; /* uid/euid of process setting the owner */ 947 int signum; /* posix.1b rt signal to be delivered on IO */ 948 }; 949 950 /* 951 * Track a single file's readahead state 952 */ 953 struct file_ra_state { 954 pgoff_t start; /* where readahead started */ 955 unsigned int size; /* # of readahead pages */ 956 unsigned int async_size; /* do asynchronous readahead when 957 there are only # of pages ahead */ 958 959 unsigned int ra_pages; /* Maximum readahead window */ 960 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ 961 loff_t prev_pos; /* Cache last read() position */ 962 }; 963 964 /* 965 * Check if @index falls in the readahead windows. 966 */ 967 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) 968 { 969 return (index >= ra->start && 970 index < ra->start + ra->size); 971 } 972 973 #define FILE_MNT_WRITE_TAKEN 1 974 #define FILE_MNT_WRITE_RELEASED 2 975 976 struct file { 977 /* 978 * fu_list becomes invalid after file_free is called and queued via 979 * fu_rcuhead for RCU freeing 980 */ 981 union { 982 struct list_head fu_list; 983 struct rcu_head fu_rcuhead; 984 } f_u; 985 struct path f_path; 986 #define f_dentry f_path.dentry 987 #define f_vfsmnt f_path.mnt 988 const struct file_operations *f_op; 989 990 /* 991 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR. 992 * Must not be taken from IRQ context. 993 */ 994 spinlock_t f_lock; 995 #ifdef CONFIG_SMP 996 int f_sb_list_cpu; 997 #endif 998 atomic_long_t f_count; 999 unsigned int f_flags; 1000 fmode_t f_mode; 1001 loff_t f_pos; 1002 struct fown_struct f_owner; 1003 const struct cred *f_cred; 1004 struct file_ra_state f_ra; 1005 1006 u64 f_version; 1007 #ifdef CONFIG_SECURITY 1008 void *f_security; 1009 #endif 1010 /* needed for tty driver, and maybe others */ 1011 void *private_data; 1012 1013 #ifdef CONFIG_EPOLL 1014 /* Used by fs/eventpoll.c to link all the hooks to this file */ 1015 struct list_head f_ep_links; 1016 struct list_head f_tfile_llink; 1017 #endif /* #ifdef CONFIG_EPOLL */ 1018 struct address_space *f_mapping; 1019 #ifdef CONFIG_DEBUG_WRITECOUNT 1020 unsigned long f_mnt_write_state; 1021 #endif 1022 }; 1023 1024 struct file_handle { 1025 __u32 handle_bytes; 1026 int handle_type; 1027 /* file identifier */ 1028 unsigned char f_handle[0]; 1029 }; 1030 1031 #define get_file(x) atomic_long_inc(&(x)->f_count) 1032 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) 1033 #define file_count(x) atomic_long_read(&(x)->f_count) 1034 1035 #ifdef CONFIG_DEBUG_WRITECOUNT 1036 static inline void file_take_write(struct file *f) 1037 { 1038 WARN_ON(f->f_mnt_write_state != 0); 1039 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; 1040 } 1041 static inline void file_release_write(struct file *f) 1042 { 1043 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; 1044 } 1045 static inline void file_reset_write(struct file *f) 1046 { 1047 f->f_mnt_write_state = 0; 1048 } 1049 static inline void file_check_state(struct file *f) 1050 { 1051 /* 1052 * At this point, either both or neither of these bits 1053 * should be set. 1054 */ 1055 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); 1056 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); 1057 } 1058 static inline int file_check_writeable(struct file *f) 1059 { 1060 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) 1061 return 0; 1062 printk(KERN_WARNING "writeable file with no " 1063 "mnt_want_write()\n"); 1064 WARN_ON(1); 1065 return -EINVAL; 1066 } 1067 #else /* !CONFIG_DEBUG_WRITECOUNT */ 1068 static inline void file_take_write(struct file *filp) {} 1069 static inline void file_release_write(struct file *filp) {} 1070 static inline void file_reset_write(struct file *filp) {} 1071 static inline void file_check_state(struct file *filp) {} 1072 static inline int file_check_writeable(struct file *filp) 1073 { 1074 return 0; 1075 } 1076 #endif /* CONFIG_DEBUG_WRITECOUNT */ 1077 1078 #define MAX_NON_LFS ((1UL<<31) - 1) 1079 1080 /* Page cache limit. The filesystems should put that into their s_maxbytes 1081 limits, otherwise bad things can happen in VM. */ 1082 #if BITS_PER_LONG==32 1083 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 1084 #elif BITS_PER_LONG==64 1085 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL 1086 #endif 1087 1088 #define FL_POSIX 1 1089 #define FL_FLOCK 2 1090 #define FL_ACCESS 8 /* not trying to lock, just looking */ 1091 #define FL_EXISTS 16 /* when unlocking, test for existence */ 1092 #define FL_LEASE 32 /* lease held on this file */ 1093 #define FL_CLOSE 64 /* unlock on close */ 1094 #define FL_SLEEP 128 /* A blocking lock */ 1095 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ 1096 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ 1097 1098 /* 1099 * Special return value from posix_lock_file() and vfs_lock_file() for 1100 * asynchronous locking. 1101 */ 1102 #define FILE_LOCK_DEFERRED 1 1103 1104 /* 1105 * The POSIX file lock owner is determined by 1106 * the "struct files_struct" in the thread group 1107 * (or NULL for no owner - BSD locks). 1108 * 1109 * Lockd stuffs a "host" pointer into this. 1110 */ 1111 typedef struct files_struct *fl_owner_t; 1112 1113 struct file_lock_operations { 1114 void (*fl_copy_lock)(struct file_lock *, struct file_lock *); 1115 void (*fl_release_private)(struct file_lock *); 1116 }; 1117 1118 struct lock_manager_operations { 1119 int (*lm_compare_owner)(struct file_lock *, struct file_lock *); 1120 void (*lm_notify)(struct file_lock *); /* unblock callback */ 1121 int (*lm_grant)(struct file_lock *, struct file_lock *, int); 1122 void (*lm_release_private)(struct file_lock *); 1123 void (*lm_break)(struct file_lock *); 1124 int (*lm_change)(struct file_lock **, int); 1125 }; 1126 1127 struct lock_manager { 1128 struct list_head list; 1129 }; 1130 1131 void locks_start_grace(struct lock_manager *); 1132 void locks_end_grace(struct lock_manager *); 1133 int locks_in_grace(void); 1134 1135 /* that will die - we need it for nfs_lock_info */ 1136 #include <linux/nfs_fs_i.h> 1137 1138 struct file_lock { 1139 struct file_lock *fl_next; /* singly linked list for this inode */ 1140 struct list_head fl_link; /* doubly linked list of all locks */ 1141 struct list_head fl_block; /* circular list of blocked processes */ 1142 fl_owner_t fl_owner; 1143 unsigned int fl_flags; 1144 unsigned char fl_type; 1145 unsigned int fl_pid; 1146 struct pid *fl_nspid; 1147 wait_queue_head_t fl_wait; 1148 struct file *fl_file; 1149 loff_t fl_start; 1150 loff_t fl_end; 1151 1152 struct fasync_struct * fl_fasync; /* for lease break notifications */ 1153 /* for lease breaks: */ 1154 unsigned long fl_break_time; 1155 unsigned long fl_downgrade_time; 1156 1157 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ 1158 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ 1159 union { 1160 struct nfs_lock_info nfs_fl; 1161 struct nfs4_lock_info nfs4_fl; 1162 struct { 1163 struct list_head link; /* link in AFS vnode's pending_locks list */ 1164 int state; /* state of grant or error if -ve */ 1165 } afs; 1166 } fl_u; 1167 }; 1168 1169 /* The following constant reflects the upper bound of the file/locking space */ 1170 #ifndef OFFSET_MAX 1171 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) 1172 #define OFFSET_MAX INT_LIMIT(loff_t) 1173 #define OFFT_OFFSET_MAX INT_LIMIT(off_t) 1174 #endif 1175 1176 #include <linux/fcntl.h> 1177 1178 extern void send_sigio(struct fown_struct *fown, int fd, int band); 1179 1180 #ifdef CONFIG_FILE_LOCKING 1181 extern int fcntl_getlk(struct file *, struct flock __user *); 1182 extern int fcntl_setlk(unsigned int, struct file *, unsigned int, 1183 struct flock __user *); 1184 1185 #if BITS_PER_LONG == 32 1186 extern int fcntl_getlk64(struct file *, struct flock64 __user *); 1187 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, 1188 struct flock64 __user *); 1189 #endif 1190 1191 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); 1192 extern int fcntl_getlease(struct file *filp); 1193 1194 /* fs/locks.c */ 1195 void locks_free_lock(struct file_lock *fl); 1196 extern void locks_init_lock(struct file_lock *); 1197 extern struct file_lock * locks_alloc_lock(void); 1198 extern void locks_copy_lock(struct file_lock *, struct file_lock *); 1199 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); 1200 extern void locks_remove_posix(struct file *, fl_owner_t); 1201 extern void locks_remove_flock(struct file *); 1202 extern void locks_release_private(struct file_lock *); 1203 extern void posix_test_lock(struct file *, struct file_lock *); 1204 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); 1205 extern int posix_lock_file_wait(struct file *, struct file_lock *); 1206 extern int posix_unblock_lock(struct file *, struct file_lock *); 1207 extern int vfs_test_lock(struct file *, struct file_lock *); 1208 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); 1209 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); 1210 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); 1211 extern int __break_lease(struct inode *inode, unsigned int flags); 1212 extern void lease_get_mtime(struct inode *, struct timespec *time); 1213 extern int generic_setlease(struct file *, long, struct file_lock **); 1214 extern int vfs_setlease(struct file *, long, struct file_lock **); 1215 extern int lease_modify(struct file_lock **, int); 1216 extern int lock_may_read(struct inode *, loff_t start, unsigned long count); 1217 extern int lock_may_write(struct inode *, loff_t start, unsigned long count); 1218 extern void locks_delete_block(struct file_lock *waiter); 1219 extern void lock_flocks(void); 1220 extern void unlock_flocks(void); 1221 #else /* !CONFIG_FILE_LOCKING */ 1222 static inline int fcntl_getlk(struct file *file, struct flock __user *user) 1223 { 1224 return -EINVAL; 1225 } 1226 1227 static inline int fcntl_setlk(unsigned int fd, struct file *file, 1228 unsigned int cmd, struct flock __user *user) 1229 { 1230 return -EACCES; 1231 } 1232 1233 #if BITS_PER_LONG == 32 1234 static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) 1235 { 1236 return -EINVAL; 1237 } 1238 1239 static inline int fcntl_setlk64(unsigned int fd, struct file *file, 1240 unsigned int cmd, struct flock64 __user *user) 1241 { 1242 return -EACCES; 1243 } 1244 #endif 1245 static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) 1246 { 1247 return 0; 1248 } 1249 1250 static inline int fcntl_getlease(struct file *filp) 1251 { 1252 return 0; 1253 } 1254 1255 static inline void locks_init_lock(struct file_lock *fl) 1256 { 1257 return; 1258 } 1259 1260 static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) 1261 { 1262 return; 1263 } 1264 1265 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) 1266 { 1267 return; 1268 } 1269 1270 static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) 1271 { 1272 return; 1273 } 1274 1275 static inline void locks_remove_flock(struct file *filp) 1276 { 1277 return; 1278 } 1279 1280 static inline void posix_test_lock(struct file *filp, struct file_lock *fl) 1281 { 1282 return; 1283 } 1284 1285 static inline int posix_lock_file(struct file *filp, struct file_lock *fl, 1286 struct file_lock *conflock) 1287 { 1288 return -ENOLCK; 1289 } 1290 1291 static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) 1292 { 1293 return -ENOLCK; 1294 } 1295 1296 static inline int posix_unblock_lock(struct file *filp, 1297 struct file_lock *waiter) 1298 { 1299 return -ENOENT; 1300 } 1301 1302 static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) 1303 { 1304 return 0; 1305 } 1306 1307 static inline int vfs_lock_file(struct file *filp, unsigned int cmd, 1308 struct file_lock *fl, struct file_lock *conf) 1309 { 1310 return -ENOLCK; 1311 } 1312 1313 static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) 1314 { 1315 return 0; 1316 } 1317 1318 static inline int flock_lock_file_wait(struct file *filp, 1319 struct file_lock *request) 1320 { 1321 return -ENOLCK; 1322 } 1323 1324 static inline int __break_lease(struct inode *inode, unsigned int mode) 1325 { 1326 return 0; 1327 } 1328 1329 static inline void lease_get_mtime(struct inode *inode, struct timespec *time) 1330 { 1331 return; 1332 } 1333 1334 static inline int generic_setlease(struct file *filp, long arg, 1335 struct file_lock **flp) 1336 { 1337 return -EINVAL; 1338 } 1339 1340 static inline int vfs_setlease(struct file *filp, long arg, 1341 struct file_lock **lease) 1342 { 1343 return -EINVAL; 1344 } 1345 1346 static inline int lease_modify(struct file_lock **before, int arg) 1347 { 1348 return -EINVAL; 1349 } 1350 1351 static inline int lock_may_read(struct inode *inode, loff_t start, 1352 unsigned long len) 1353 { 1354 return 1; 1355 } 1356 1357 static inline int lock_may_write(struct inode *inode, loff_t start, 1358 unsigned long len) 1359 { 1360 return 1; 1361 } 1362 1363 static inline void locks_delete_block(struct file_lock *waiter) 1364 { 1365 } 1366 1367 static inline void lock_flocks(void) 1368 { 1369 } 1370 1371 static inline void unlock_flocks(void) 1372 { 1373 } 1374 1375 #endif /* !CONFIG_FILE_LOCKING */ 1376 1377 1378 struct fasync_struct { 1379 spinlock_t fa_lock; 1380 int magic; 1381 int fa_fd; 1382 struct fasync_struct *fa_next; /* singly linked list */ 1383 struct file *fa_file; 1384 struct rcu_head fa_rcu; 1385 }; 1386 1387 #define FASYNC_MAGIC 0x4601 1388 1389 /* SMP safe fasync helpers: */ 1390 extern int fasync_helper(int, struct file *, int, struct fasync_struct **); 1391 extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); 1392 extern int fasync_remove_entry(struct file *, struct fasync_struct **); 1393 extern struct fasync_struct *fasync_alloc(void); 1394 extern void fasync_free(struct fasync_struct *); 1395 1396 /* can be called from interrupts */ 1397 extern void kill_fasync(struct fasync_struct **, int, int); 1398 1399 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); 1400 extern int f_setown(struct file *filp, unsigned long arg, int force); 1401 extern void f_delown(struct file *filp); 1402 extern pid_t f_getown(struct file *filp); 1403 extern int send_sigurg(struct fown_struct *fown); 1404 1405 /* 1406 * Umount options 1407 */ 1408 1409 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ 1410 #define MNT_DETACH 0x00000002 /* Just detach from the tree */ 1411 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ 1412 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ 1413 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ 1414 1415 extern struct list_head super_blocks; 1416 extern spinlock_t sb_lock; 1417 1418 struct super_block { 1419 struct list_head s_list; /* Keep this first */ 1420 dev_t s_dev; /* search index; _not_ kdev_t */ 1421 unsigned char s_dirt; 1422 unsigned char s_blocksize_bits; 1423 unsigned long s_blocksize; 1424 loff_t s_maxbytes; /* Max file size */ 1425 struct file_system_type *s_type; 1426 const struct super_operations *s_op; 1427 const struct dquot_operations *dq_op; 1428 const struct quotactl_ops *s_qcop; 1429 const struct export_operations *s_export_op; 1430 unsigned long s_flags; 1431 unsigned long s_magic; 1432 struct dentry *s_root; 1433 struct rw_semaphore s_umount; 1434 struct mutex s_lock; 1435 int s_count; 1436 atomic_t s_active; 1437 #ifdef CONFIG_SECURITY 1438 void *s_security; 1439 #endif 1440 const struct xattr_handler **s_xattr; 1441 1442 struct list_head s_inodes; /* all inodes */ 1443 struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ 1444 #ifdef CONFIG_SMP 1445 struct list_head __percpu *s_files; 1446 #else 1447 struct list_head s_files; 1448 #endif 1449 struct list_head s_mounts; /* list of mounts; _not_ for fs use */ 1450 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */ 1451 struct list_head s_dentry_lru; /* unused dentry lru */ 1452 int s_nr_dentry_unused; /* # of dentry on lru */ 1453 1454 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */ 1455 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp; 1456 struct list_head s_inode_lru; /* unused inode lru */ 1457 int s_nr_inodes_unused; /* # of inodes on lru */ 1458 1459 struct block_device *s_bdev; 1460 struct backing_dev_info *s_bdi; 1461 struct mtd_info *s_mtd; 1462 struct hlist_node s_instances; 1463 struct quota_info s_dquot; /* Diskquota specific options */ 1464 1465 int s_frozen; 1466 wait_queue_head_t s_wait_unfrozen; 1467 1468 char s_id[32]; /* Informational name */ 1469 u8 s_uuid[16]; /* UUID */ 1470 1471 void *s_fs_info; /* Filesystem private info */ 1472 unsigned int s_max_links; 1473 fmode_t s_mode; 1474 1475 /* Granularity of c/m/atime in ns. 1476 Cannot be worse than a second */ 1477 u32 s_time_gran; 1478 1479 /* 1480 * The next field is for VFS *only*. No filesystems have any business 1481 * even looking at it. You had been warned. 1482 */ 1483 struct mutex s_vfs_rename_mutex; /* Kludge */ 1484 1485 /* 1486 * Filesystem subtype. If non-empty the filesystem type field 1487 * in /proc/mounts will be "type.subtype" 1488 */ 1489 char *s_subtype; 1490 1491 /* 1492 * Saved mount options for lazy filesystems using 1493 * generic_show_options() 1494 */ 1495 char __rcu *s_options; 1496 const struct dentry_operations *s_d_op; /* default d_op for dentries */ 1497 1498 /* 1499 * Saved pool identifier for cleancache (-1 means none) 1500 */ 1501 int cleancache_poolid; 1502 1503 struct shrinker s_shrink; /* per-sb shrinker handle */ 1504 1505 /* Number of inodes with nlink == 0 but still referenced */ 1506 atomic_long_t s_remove_count; 1507 1508 /* Being remounted read-only */ 1509 int s_readonly_remount; 1510 }; 1511 1512 /* superblock cache pruning functions */ 1513 extern void prune_icache_sb(struct super_block *sb, int nr_to_scan); 1514 extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan); 1515 1516 extern struct timespec current_fs_time(struct super_block *sb); 1517 1518 /* 1519 * Snapshotting support. 1520 */ 1521 enum { 1522 SB_UNFROZEN = 0, 1523 SB_FREEZE_WRITE = 1, 1524 SB_FREEZE_TRANS = 2, 1525 }; 1526 1527 #define vfs_check_frozen(sb, level) \ 1528 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) 1529 1530 /* 1531 * until VFS tracks user namespaces for inodes, just make all files 1532 * belong to init_user_ns 1533 */ 1534 extern struct user_namespace init_user_ns; 1535 #define inode_userns(inode) (&init_user_ns) 1536 extern bool inode_owner_or_capable(const struct inode *inode); 1537 1538 /* not quite ready to be deprecated, but... */ 1539 extern void lock_super(struct super_block *); 1540 extern void unlock_super(struct super_block *); 1541 1542 /* 1543 * VFS helper functions.. 1544 */ 1545 extern int vfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *); 1546 extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); 1547 extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 1548 extern int vfs_symlink(struct inode *, struct dentry *, const char *); 1549 extern int vfs_link(struct dentry *, struct inode *, struct dentry *); 1550 extern int vfs_rmdir(struct inode *, struct dentry *); 1551 extern int vfs_unlink(struct inode *, struct dentry *); 1552 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 1553 1554 /* 1555 * VFS dentry helper functions. 1556 */ 1557 extern void dentry_unhash(struct dentry *dentry); 1558 1559 /* 1560 * VFS file helper functions. 1561 */ 1562 extern void inode_init_owner(struct inode *inode, const struct inode *dir, 1563 umode_t mode); 1564 /* 1565 * VFS FS_IOC_FIEMAP helper definitions. 1566 */ 1567 struct fiemap_extent_info { 1568 unsigned int fi_flags; /* Flags as passed from user */ 1569 unsigned int fi_extents_mapped; /* Number of mapped extents */ 1570 unsigned int fi_extents_max; /* Size of fiemap_extent array */ 1571 struct fiemap_extent __user *fi_extents_start; /* Start of 1572 fiemap_extent array */ 1573 }; 1574 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, 1575 u64 phys, u64 len, u32 flags); 1576 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); 1577 1578 /* 1579 * File types 1580 * 1581 * NOTE! These match bits 12..15 of stat.st_mode 1582 * (ie "(i_mode >> 12) & 15"). 1583 */ 1584 #define DT_UNKNOWN 0 1585 #define DT_FIFO 1 1586 #define DT_CHR 2 1587 #define DT_DIR 4 1588 #define DT_BLK 6 1589 #define DT_REG 8 1590 #define DT_LNK 10 1591 #define DT_SOCK 12 1592 #define DT_WHT 14 1593 1594 /* 1595 * This is the "filldir" function type, used by readdir() to let 1596 * the kernel specify what kind of dirent layout it wants to have. 1597 * This allows the kernel to read directories into kernel space or 1598 * to have different dirent layouts depending on the binary type. 1599 */ 1600 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); 1601 struct block_device_operations; 1602 1603 /* These macros are for out of kernel modules to test that 1604 * the kernel supports the unlocked_ioctl and compat_ioctl 1605 * fields in struct file_operations. */ 1606 #define HAVE_COMPAT_IOCTL 1 1607 #define HAVE_UNLOCKED_IOCTL 1 1608 1609 struct file_operations { 1610 struct module *owner; 1611 loff_t (*llseek) (struct file *, loff_t, int); 1612 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); 1613 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); 1614 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 1615 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 1616 int (*readdir) (struct file *, void *, filldir_t); 1617 unsigned int (*poll) (struct file *, struct poll_table_struct *); 1618 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); 1619 long (*compat_ioctl) (struct file *, unsigned int, unsigned long); 1620 int (*mmap) (struct file *, struct vm_area_struct *); 1621 int (*open) (struct inode *, struct file *); 1622 int (*flush) (struct file *, fl_owner_t id); 1623 int (*release) (struct inode *, struct file *); 1624 int (*fsync) (struct file *, loff_t, loff_t, int datasync); 1625 int (*aio_fsync) (struct kiocb *, int datasync); 1626 int (*fasync) (int, struct file *, int); 1627 int (*lock) (struct file *, int, struct file_lock *); 1628 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); 1629 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); 1630 int (*check_flags)(int); 1631 int (*flock) (struct file *, int, struct file_lock *); 1632 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); 1633 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); 1634 int (*setlease)(struct file *, long, struct file_lock **); 1635 long (*fallocate)(struct file *file, int mode, loff_t offset, 1636 loff_t len); 1637 }; 1638 1639 struct inode_operations { 1640 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); 1641 void * (*follow_link) (struct dentry *, struct nameidata *); 1642 int (*permission) (struct inode *, int); 1643 struct posix_acl * (*get_acl)(struct inode *, int); 1644 1645 int (*readlink) (struct dentry *, char __user *,int); 1646 void (*put_link) (struct dentry *, struct nameidata *, void *); 1647 1648 int (*create) (struct inode *,struct dentry *,umode_t,struct nameidata *); 1649 int (*link) (struct dentry *,struct inode *,struct dentry *); 1650 int (*unlink) (struct inode *,struct dentry *); 1651 int (*symlink) (struct inode *,struct dentry *,const char *); 1652 int (*mkdir) (struct inode *,struct dentry *,umode_t); 1653 int (*rmdir) (struct inode *,struct dentry *); 1654 int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); 1655 int (*rename) (struct inode *, struct dentry *, 1656 struct inode *, struct dentry *); 1657 void (*truncate) (struct inode *); 1658 int (*setattr) (struct dentry *, struct iattr *); 1659 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); 1660 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); 1661 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); 1662 ssize_t (*listxattr) (struct dentry *, char *, size_t); 1663 int (*removexattr) (struct dentry *, const char *); 1664 void (*truncate_range)(struct inode *, loff_t, loff_t); 1665 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, 1666 u64 len); 1667 } ____cacheline_aligned; 1668 1669 struct seq_file; 1670 1671 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, 1672 unsigned long nr_segs, unsigned long fast_segs, 1673 struct iovec *fast_pointer, 1674 struct iovec **ret_pointer, 1675 int check_access); 1676 1677 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); 1678 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); 1679 extern ssize_t vfs_readv(struct file *, const struct iovec __user *, 1680 unsigned long, loff_t *); 1681 extern ssize_t vfs_writev(struct file *, const struct iovec __user *, 1682 unsigned long, loff_t *); 1683 1684 struct super_operations { 1685 struct inode *(*alloc_inode)(struct super_block *sb); 1686 void (*destroy_inode)(struct inode *); 1687 1688 void (*dirty_inode) (struct inode *, int flags); 1689 int (*write_inode) (struct inode *, struct writeback_control *wbc); 1690 int (*drop_inode) (struct inode *); 1691 void (*evict_inode) (struct inode *); 1692 void (*put_super) (struct super_block *); 1693 void (*write_super) (struct super_block *); 1694 int (*sync_fs)(struct super_block *sb, int wait); 1695 int (*freeze_fs) (struct super_block *); 1696 int (*unfreeze_fs) (struct super_block *); 1697 int (*statfs) (struct dentry *, struct kstatfs *); 1698 int (*remount_fs) (struct super_block *, int *, char *); 1699 void (*umount_begin) (struct super_block *); 1700 1701 int (*show_options)(struct seq_file *, struct dentry *); 1702 int (*show_devname)(struct seq_file *, struct dentry *); 1703 int (*show_path)(struct seq_file *, struct dentry *); 1704 int (*show_stats)(struct seq_file *, struct dentry *); 1705 #ifdef CONFIG_QUOTA 1706 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); 1707 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); 1708 #endif 1709 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); 1710 int (*nr_cached_objects)(struct super_block *); 1711 void (*free_cached_objects)(struct super_block *, int); 1712 }; 1713 1714 /* 1715 * Inode state bits. Protected by inode->i_lock 1716 * 1717 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, 1718 * I_DIRTY_DATASYNC and I_DIRTY_PAGES. 1719 * 1720 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, 1721 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at 1722 * various stages of removing an inode. 1723 * 1724 * Two bits are used for locking and completion notification, I_NEW and I_SYNC. 1725 * 1726 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on 1727 * fdatasync(). i_atime is the usual cause. 1728 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of 1729 * these changes separately from I_DIRTY_SYNC so that we 1730 * don't have to write inode on fdatasync() when only 1731 * mtime has changed in it. 1732 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. 1733 * I_NEW Serves as both a mutex and completion notification. 1734 * New inodes set I_NEW. If two processes both create 1735 * the same inode, one of them will release its inode and 1736 * wait for I_NEW to be released before returning. 1737 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can 1738 * also cause waiting on I_NEW, without I_NEW actually 1739 * being set. find_inode() uses this to prevent returning 1740 * nearly-dead inodes. 1741 * I_WILL_FREE Must be set when calling write_inode_now() if i_count 1742 * is zero. I_FREEING must be set when I_WILL_FREE is 1743 * cleared. 1744 * I_FREEING Set when inode is about to be freed but still has dirty 1745 * pages or buffers attached or the inode itself is still 1746 * dirty. 1747 * I_CLEAR Added by end_writeback(). In this state the inode is clean 1748 * and can be destroyed. Inode keeps I_FREEING. 1749 * 1750 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are 1751 * prohibited for many purposes. iget() must wait for 1752 * the inode to be completely released, then create it 1753 * anew. Other functions will just ignore such inodes, 1754 * if appropriate. I_NEW is used for waiting. 1755 * 1756 * I_SYNC Synchonized write of dirty inode data. The bits is 1757 * set during data writeback, and cleared with a wakeup 1758 * on the bit address once it is done. 1759 * 1760 * I_REFERENCED Marks the inode as recently references on the LRU list. 1761 * 1762 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). 1763 * 1764 * Q: What is the difference between I_WILL_FREE and I_FREEING? 1765 */ 1766 #define I_DIRTY_SYNC (1 << 0) 1767 #define I_DIRTY_DATASYNC (1 << 1) 1768 #define I_DIRTY_PAGES (1 << 2) 1769 #define __I_NEW 3 1770 #define I_NEW (1 << __I_NEW) 1771 #define I_WILL_FREE (1 << 4) 1772 #define I_FREEING (1 << 5) 1773 #define I_CLEAR (1 << 6) 1774 #define __I_SYNC 7 1775 #define I_SYNC (1 << __I_SYNC) 1776 #define I_REFERENCED (1 << 8) 1777 #define __I_DIO_WAKEUP 9 1778 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP) 1779 1780 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) 1781 1782 extern void __mark_inode_dirty(struct inode *, int); 1783 static inline void mark_inode_dirty(struct inode *inode) 1784 { 1785 __mark_inode_dirty(inode, I_DIRTY); 1786 } 1787 1788 static inline void mark_inode_dirty_sync(struct inode *inode) 1789 { 1790 __mark_inode_dirty(inode, I_DIRTY_SYNC); 1791 } 1792 1793 extern void inc_nlink(struct inode *inode); 1794 extern void drop_nlink(struct inode *inode); 1795 extern void clear_nlink(struct inode *inode); 1796 extern void set_nlink(struct inode *inode, unsigned int nlink); 1797 1798 static inline void inode_inc_link_count(struct inode *inode) 1799 { 1800 inc_nlink(inode); 1801 mark_inode_dirty(inode); 1802 } 1803 1804 static inline void inode_dec_link_count(struct inode *inode) 1805 { 1806 drop_nlink(inode); 1807 mark_inode_dirty(inode); 1808 } 1809 1810 /** 1811 * inode_inc_iversion - increments i_version 1812 * @inode: inode that need to be updated 1813 * 1814 * Every time the inode is modified, the i_version field will be incremented. 1815 * The filesystem has to be mounted with i_version flag 1816 */ 1817 1818 static inline void inode_inc_iversion(struct inode *inode) 1819 { 1820 spin_lock(&inode->i_lock); 1821 inode->i_version++; 1822 spin_unlock(&inode->i_lock); 1823 } 1824 1825 extern void touch_atime(struct path *); 1826 static inline void file_accessed(struct file *file) 1827 { 1828 if (!(file->f_flags & O_NOATIME)) 1829 touch_atime(&file->f_path); 1830 } 1831 1832 int sync_inode(struct inode *inode, struct writeback_control *wbc); 1833 int sync_inode_metadata(struct inode *inode, int wait); 1834 1835 struct file_system_type { 1836 const char *name; 1837 int fs_flags; 1838 struct dentry *(*mount) (struct file_system_type *, int, 1839 const char *, void *); 1840 void (*kill_sb) (struct super_block *); 1841 struct module *owner; 1842 struct file_system_type * next; 1843 struct hlist_head fs_supers; 1844 1845 struct lock_class_key s_lock_key; 1846 struct lock_class_key s_umount_key; 1847 struct lock_class_key s_vfs_rename_key; 1848 1849 struct lock_class_key i_lock_key; 1850 struct lock_class_key i_mutex_key; 1851 struct lock_class_key i_mutex_dir_key; 1852 }; 1853 1854 extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, 1855 void *data, int (*fill_super)(struct super_block *, void *, int)); 1856 extern struct dentry *mount_bdev(struct file_system_type *fs_type, 1857 int flags, const char *dev_name, void *data, 1858 int (*fill_super)(struct super_block *, void *, int)); 1859 extern struct dentry *mount_single(struct file_system_type *fs_type, 1860 int flags, void *data, 1861 int (*fill_super)(struct super_block *, void *, int)); 1862 extern struct dentry *mount_nodev(struct file_system_type *fs_type, 1863 int flags, void *data, 1864 int (*fill_super)(struct super_block *, void *, int)); 1865 extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); 1866 void generic_shutdown_super(struct super_block *sb); 1867 void kill_block_super(struct super_block *sb); 1868 void kill_anon_super(struct super_block *sb); 1869 void kill_litter_super(struct super_block *sb); 1870 void deactivate_super(struct super_block *sb); 1871 void deactivate_locked_super(struct super_block *sb); 1872 int set_anon_super(struct super_block *s, void *data); 1873 int get_anon_bdev(dev_t *); 1874 void free_anon_bdev(dev_t); 1875 struct super_block *sget(struct file_system_type *type, 1876 int (*test)(struct super_block *,void *), 1877 int (*set)(struct super_block *,void *), 1878 void *data); 1879 extern struct dentry *mount_pseudo(struct file_system_type *, char *, 1880 const struct super_operations *ops, 1881 const struct dentry_operations *dops, 1882 unsigned long); 1883 1884 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ 1885 #define fops_get(fops) \ 1886 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) 1887 #define fops_put(fops) \ 1888 do { if (fops) module_put((fops)->owner); } while(0) 1889 1890 extern int register_filesystem(struct file_system_type *); 1891 extern int unregister_filesystem(struct file_system_type *); 1892 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); 1893 #define kern_mount(type) kern_mount_data(type, NULL) 1894 extern void kern_unmount(struct vfsmount *mnt); 1895 extern int may_umount_tree(struct vfsmount *); 1896 extern int may_umount(struct vfsmount *); 1897 extern long do_mount(char *, char *, char *, unsigned long, void *); 1898 extern struct vfsmount *collect_mounts(struct path *); 1899 extern void drop_collected_mounts(struct vfsmount *); 1900 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, 1901 struct vfsmount *); 1902 extern int vfs_statfs(struct path *, struct kstatfs *); 1903 extern int user_statfs(const char __user *, struct kstatfs *); 1904 extern int fd_statfs(int, struct kstatfs *); 1905 extern int vfs_ustat(dev_t, struct kstatfs *); 1906 extern int freeze_super(struct super_block *super); 1907 extern int thaw_super(struct super_block *super); 1908 extern bool our_mnt(struct vfsmount *mnt); 1909 1910 extern int current_umask(void); 1911 1912 /* /sys/fs */ 1913 extern struct kobject *fs_kobj; 1914 1915 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) 1916 extern int rw_verify_area(int, struct file *, loff_t *, size_t); 1917 1918 #define FLOCK_VERIFY_READ 1 1919 #define FLOCK_VERIFY_WRITE 2 1920 1921 #ifdef CONFIG_FILE_LOCKING 1922 extern int locks_mandatory_locked(struct inode *); 1923 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); 1924 1925 /* 1926 * Candidates for mandatory locking have the setgid bit set 1927 * but no group execute bit - an otherwise meaningless combination. 1928 */ 1929 1930 static inline int __mandatory_lock(struct inode *ino) 1931 { 1932 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; 1933 } 1934 1935 /* 1936 * ... and these candidates should be on MS_MANDLOCK mounted fs, 1937 * otherwise these will be advisory locks 1938 */ 1939 1940 static inline int mandatory_lock(struct inode *ino) 1941 { 1942 return IS_MANDLOCK(ino) && __mandatory_lock(ino); 1943 } 1944 1945 static inline int locks_verify_locked(struct inode *inode) 1946 { 1947 if (mandatory_lock(inode)) 1948 return locks_mandatory_locked(inode); 1949 return 0; 1950 } 1951 1952 static inline int locks_verify_truncate(struct inode *inode, 1953 struct file *filp, 1954 loff_t size) 1955 { 1956 if (inode->i_flock && mandatory_lock(inode)) 1957 return locks_mandatory_area( 1958 FLOCK_VERIFY_WRITE, inode, filp, 1959 size < inode->i_size ? size : inode->i_size, 1960 (size < inode->i_size ? inode->i_size - size 1961 : size - inode->i_size) 1962 ); 1963 return 0; 1964 } 1965 1966 static inline int break_lease(struct inode *inode, unsigned int mode) 1967 { 1968 if (inode->i_flock) 1969 return __break_lease(inode, mode); 1970 return 0; 1971 } 1972 #else /* !CONFIG_FILE_LOCKING */ 1973 static inline int locks_mandatory_locked(struct inode *inode) 1974 { 1975 return 0; 1976 } 1977 1978 static inline int locks_mandatory_area(int rw, struct inode *inode, 1979 struct file *filp, loff_t offset, 1980 size_t count) 1981 { 1982 return 0; 1983 } 1984 1985 static inline int __mandatory_lock(struct inode *inode) 1986 { 1987 return 0; 1988 } 1989 1990 static inline int mandatory_lock(struct inode *inode) 1991 { 1992 return 0; 1993 } 1994 1995 static inline int locks_verify_locked(struct inode *inode) 1996 { 1997 return 0; 1998 } 1999 2000 static inline int locks_verify_truncate(struct inode *inode, struct file *filp, 2001 size_t size) 2002 { 2003 return 0; 2004 } 2005 2006 static inline int break_lease(struct inode *inode, unsigned int mode) 2007 { 2008 return 0; 2009 } 2010 2011 #endif /* CONFIG_FILE_LOCKING */ 2012 2013 /* fs/open.c */ 2014 2015 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, 2016 struct file *filp); 2017 extern int do_fallocate(struct file *file, int mode, loff_t offset, 2018 loff_t len); 2019 extern long do_sys_open(int dfd, const char __user *filename, int flags, 2020 umode_t mode); 2021 extern struct file *filp_open(const char *, int, umode_t); 2022 extern struct file *file_open_root(struct dentry *, struct vfsmount *, 2023 const char *, int); 2024 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int, 2025 const struct cred *); 2026 extern int filp_close(struct file *, fl_owner_t id); 2027 extern char * getname(const char __user *); 2028 2029 /* fs/ioctl.c */ 2030 2031 extern int ioctl_preallocate(struct file *filp, void __user *argp); 2032 2033 /* fs/dcache.c */ 2034 extern void __init vfs_caches_init_early(void); 2035 extern void __init vfs_caches_init(unsigned long); 2036 2037 extern struct kmem_cache *names_cachep; 2038 2039 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp)) 2040 #define __getname() __getname_gfp(GFP_KERNEL) 2041 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) 2042 #ifndef CONFIG_AUDITSYSCALL 2043 #define putname(name) __putname(name) 2044 #else 2045 extern void putname(const char *name); 2046 #endif 2047 2048 #ifdef CONFIG_BLOCK 2049 extern int register_blkdev(unsigned int, const char *); 2050 extern void unregister_blkdev(unsigned int, const char *); 2051 extern struct block_device *bdget(dev_t); 2052 extern struct block_device *bdgrab(struct block_device *bdev); 2053 extern void bd_set_size(struct block_device *, loff_t size); 2054 extern sector_t blkdev_max_block(struct block_device *bdev); 2055 extern void bd_forget(struct inode *inode); 2056 extern void bdput(struct block_device *); 2057 extern void invalidate_bdev(struct block_device *); 2058 extern int sync_blockdev(struct block_device *bdev); 2059 extern void kill_bdev(struct block_device *); 2060 extern struct super_block *freeze_bdev(struct block_device *); 2061 extern void emergency_thaw_all(void); 2062 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); 2063 extern int fsync_bdev(struct block_device *); 2064 #else 2065 static inline void bd_forget(struct inode *inode) {} 2066 static inline int sync_blockdev(struct block_device *bdev) { return 0; } 2067 static inline void kill_bdev(struct block_device *bdev) {} 2068 static inline void invalidate_bdev(struct block_device *bdev) {} 2069 2070 static inline struct super_block *freeze_bdev(struct block_device *sb) 2071 { 2072 return NULL; 2073 } 2074 2075 static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) 2076 { 2077 return 0; 2078 } 2079 #endif 2080 extern int sync_filesystem(struct super_block *); 2081 extern const struct file_operations def_blk_fops; 2082 extern const struct file_operations def_chr_fops; 2083 extern const struct file_operations bad_sock_fops; 2084 extern const struct file_operations def_fifo_fops; 2085 #ifdef CONFIG_BLOCK 2086 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); 2087 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); 2088 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); 2089 extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); 2090 extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 2091 void *holder); 2092 extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, 2093 void *holder); 2094 extern int blkdev_put(struct block_device *bdev, fmode_t mode); 2095 #ifdef CONFIG_SYSFS 2096 extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); 2097 extern void bd_unlink_disk_holder(struct block_device *bdev, 2098 struct gendisk *disk); 2099 #else 2100 static inline int bd_link_disk_holder(struct block_device *bdev, 2101 struct gendisk *disk) 2102 { 2103 return 0; 2104 } 2105 static inline void bd_unlink_disk_holder(struct block_device *bdev, 2106 struct gendisk *disk) 2107 { 2108 } 2109 #endif 2110 #endif 2111 2112 /* fs/char_dev.c */ 2113 #define CHRDEV_MAJOR_HASH_SIZE 255 2114 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); 2115 extern int register_chrdev_region(dev_t, unsigned, const char *); 2116 extern int __register_chrdev(unsigned int major, unsigned int baseminor, 2117 unsigned int count, const char *name, 2118 const struct file_operations *fops); 2119 extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, 2120 unsigned int count, const char *name); 2121 extern void unregister_chrdev_region(dev_t, unsigned); 2122 extern void chrdev_show(struct seq_file *,off_t); 2123 2124 static inline int register_chrdev(unsigned int major, const char *name, 2125 const struct file_operations *fops) 2126 { 2127 return __register_chrdev(major, 0, 256, name, fops); 2128 } 2129 2130 static inline void unregister_chrdev(unsigned int major, const char *name) 2131 { 2132 __unregister_chrdev(major, 0, 256, name); 2133 } 2134 2135 /* fs/block_dev.c */ 2136 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 2137 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 2138 2139 #ifdef CONFIG_BLOCK 2140 #define BLKDEV_MAJOR_HASH_SIZE 255 2141 extern const char *__bdevname(dev_t, char *buffer); 2142 extern const char *bdevname(struct block_device *bdev, char *buffer); 2143 extern struct block_device *lookup_bdev(const char *); 2144 extern void blkdev_show(struct seq_file *,off_t); 2145 2146 #else 2147 #define BLKDEV_MAJOR_HASH_SIZE 0 2148 #endif 2149 2150 extern void init_special_inode(struct inode *, umode_t, dev_t); 2151 2152 /* Invalid inode operations -- fs/bad_inode.c */ 2153 extern void make_bad_inode(struct inode *); 2154 extern int is_bad_inode(struct inode *); 2155 2156 extern const struct file_operations read_pipefifo_fops; 2157 extern const struct file_operations write_pipefifo_fops; 2158 extern const struct file_operations rdwr_pipefifo_fops; 2159 2160 #ifdef CONFIG_BLOCK 2161 /* 2162 * return READ, READA, or WRITE 2163 */ 2164 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) 2165 2166 /* 2167 * return data direction, READ or WRITE 2168 */ 2169 #define bio_data_dir(bio) ((bio)->bi_rw & 1) 2170 2171 extern void check_disk_size_change(struct gendisk *disk, 2172 struct block_device *bdev); 2173 extern int revalidate_disk(struct gendisk *); 2174 extern int check_disk_change(struct block_device *); 2175 extern int __invalidate_device(struct block_device *, bool); 2176 extern int invalidate_partition(struct gendisk *, int); 2177 #endif 2178 unsigned long invalidate_mapping_pages(struct address_space *mapping, 2179 pgoff_t start, pgoff_t end); 2180 2181 static inline void invalidate_remote_inode(struct inode *inode) 2182 { 2183 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 2184 S_ISLNK(inode->i_mode)) 2185 invalidate_mapping_pages(inode->i_mapping, 0, -1); 2186 } 2187 extern int invalidate_inode_pages2(struct address_space *mapping); 2188 extern int invalidate_inode_pages2_range(struct address_space *mapping, 2189 pgoff_t start, pgoff_t end); 2190 extern int write_inode_now(struct inode *, int); 2191 extern int filemap_fdatawrite(struct address_space *); 2192 extern int filemap_flush(struct address_space *); 2193 extern int filemap_fdatawait(struct address_space *); 2194 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, 2195 loff_t lend); 2196 extern int filemap_write_and_wait(struct address_space *mapping); 2197 extern int filemap_write_and_wait_range(struct address_space *mapping, 2198 loff_t lstart, loff_t lend); 2199 extern int __filemap_fdatawrite_range(struct address_space *mapping, 2200 loff_t start, loff_t end, int sync_mode); 2201 extern int filemap_fdatawrite_range(struct address_space *mapping, 2202 loff_t start, loff_t end); 2203 2204 extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, 2205 int datasync); 2206 extern int vfs_fsync(struct file *file, int datasync); 2207 extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); 2208 extern void sync_supers(void); 2209 extern void emergency_sync(void); 2210 extern void emergency_remount(void); 2211 #ifdef CONFIG_BLOCK 2212 extern sector_t bmap(struct inode *, sector_t); 2213 #endif 2214 extern int notify_change(struct dentry *, struct iattr *); 2215 extern int inode_permission(struct inode *, int); 2216 extern int generic_permission(struct inode *, int); 2217 2218 static inline bool execute_ok(struct inode *inode) 2219 { 2220 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); 2221 } 2222 2223 /* 2224 * get_write_access() gets write permission for a file. 2225 * put_write_access() releases this write permission. 2226 * This is used for regular files. 2227 * We cannot support write (and maybe mmap read-write shared) accesses and 2228 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode 2229 * can have the following values: 2230 * 0: no writers, no VM_DENYWRITE mappings 2231 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist 2232 * > 0: (i_writecount) users are writing to the file. 2233 * 2234 * Normally we operate on that counter with atomic_{inc,dec} and it's safe 2235 * except for the cases where we don't hold i_writecount yet. Then we need to 2236 * use {get,deny}_write_access() - these functions check the sign and refuse 2237 * to do the change if sign is wrong. 2238 */ 2239 static inline int get_write_access(struct inode *inode) 2240 { 2241 return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; 2242 } 2243 static inline int deny_write_access(struct file *file) 2244 { 2245 struct inode *inode = file->f_path.dentry->d_inode; 2246 return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; 2247 } 2248 static inline void put_write_access(struct inode * inode) 2249 { 2250 atomic_dec(&inode->i_writecount); 2251 } 2252 static inline void allow_write_access(struct file *file) 2253 { 2254 if (file) 2255 atomic_inc(&file->f_path.dentry->d_inode->i_writecount); 2256 } 2257 #ifdef CONFIG_IMA 2258 static inline void i_readcount_dec(struct inode *inode) 2259 { 2260 BUG_ON(!atomic_read(&inode->i_readcount)); 2261 atomic_dec(&inode->i_readcount); 2262 } 2263 static inline void i_readcount_inc(struct inode *inode) 2264 { 2265 atomic_inc(&inode->i_readcount); 2266 } 2267 #else 2268 static inline void i_readcount_dec(struct inode *inode) 2269 { 2270 return; 2271 } 2272 static inline void i_readcount_inc(struct inode *inode) 2273 { 2274 return; 2275 } 2276 #endif 2277 extern int do_pipe_flags(int *, int); 2278 extern struct file *create_read_pipe(struct file *f, int flags); 2279 extern struct file *create_write_pipe(int flags); 2280 extern void free_write_pipe(struct file *); 2281 2282 extern int kernel_read(struct file *, loff_t, char *, unsigned long); 2283 extern struct file * open_exec(const char *); 2284 2285 /* fs/dcache.c -- generic fs support functions */ 2286 extern int is_subdir(struct dentry *, struct dentry *); 2287 extern int path_is_under(struct path *, struct path *); 2288 extern ino_t find_inode_number(struct dentry *, struct qstr *); 2289 2290 #include <linux/err.h> 2291 2292 /* needed for stackable file system support */ 2293 extern loff_t default_llseek(struct file *file, loff_t offset, int origin); 2294 2295 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); 2296 2297 extern int inode_init_always(struct super_block *, struct inode *); 2298 extern void inode_init_once(struct inode *); 2299 extern void address_space_init_once(struct address_space *mapping); 2300 extern void ihold(struct inode * inode); 2301 extern void iput(struct inode *); 2302 extern struct inode * igrab(struct inode *); 2303 extern ino_t iunique(struct super_block *, ino_t); 2304 extern int inode_needs_sync(struct inode *inode); 2305 extern int generic_delete_inode(struct inode *inode); 2306 static inline int generic_drop_inode(struct inode *inode) 2307 { 2308 return !inode->i_nlink || inode_unhashed(inode); 2309 } 2310 2311 extern struct inode *ilookup5_nowait(struct super_block *sb, 2312 unsigned long hashval, int (*test)(struct inode *, void *), 2313 void *data); 2314 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, 2315 int (*test)(struct inode *, void *), void *data); 2316 extern struct inode *ilookup(struct super_block *sb, unsigned long ino); 2317 2318 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); 2319 extern struct inode * iget_locked(struct super_block *, unsigned long); 2320 extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); 2321 extern int insert_inode_locked(struct inode *); 2322 #ifdef CONFIG_DEBUG_LOCK_ALLOC 2323 extern void lockdep_annotate_inode_mutex_key(struct inode *inode); 2324 #else 2325 static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; 2326 #endif 2327 extern void unlock_new_inode(struct inode *); 2328 extern unsigned int get_next_ino(void); 2329 2330 extern void __iget(struct inode * inode); 2331 extern void iget_failed(struct inode *); 2332 extern void end_writeback(struct inode *); 2333 extern void __destroy_inode(struct inode *); 2334 extern struct inode *new_inode_pseudo(struct super_block *sb); 2335 extern struct inode *new_inode(struct super_block *sb); 2336 extern void free_inode_nonrcu(struct inode *inode); 2337 extern int should_remove_suid(struct dentry *); 2338 extern int file_remove_suid(struct file *); 2339 2340 extern void __insert_inode_hash(struct inode *, unsigned long hashval); 2341 static inline void insert_inode_hash(struct inode *inode) 2342 { 2343 __insert_inode_hash(inode, inode->i_ino); 2344 } 2345 2346 extern void __remove_inode_hash(struct inode *); 2347 static inline void remove_inode_hash(struct inode *inode) 2348 { 2349 if (!inode_unhashed(inode)) 2350 __remove_inode_hash(inode); 2351 } 2352 2353 extern void inode_sb_list_add(struct inode *inode); 2354 2355 #ifdef CONFIG_BLOCK 2356 extern void submit_bio(int, struct bio *); 2357 extern int bdev_read_only(struct block_device *); 2358 #endif 2359 extern int set_blocksize(struct block_device *, int); 2360 extern int sb_set_blocksize(struct super_block *, int); 2361 extern int sb_min_blocksize(struct super_block *, int); 2362 2363 extern int generic_file_mmap(struct file *, struct vm_area_struct *); 2364 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); 2365 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); 2366 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); 2367 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); 2368 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, 2369 loff_t *); 2370 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); 2371 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, 2372 unsigned long *, loff_t, loff_t *, size_t, size_t); 2373 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, 2374 unsigned long, loff_t, loff_t *, size_t, ssize_t); 2375 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); 2376 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); 2377 extern int generic_segment_checks(const struct iovec *iov, 2378 unsigned long *nr_segs, size_t *count, int access_flags); 2379 2380 /* fs/block_dev.c */ 2381 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, 2382 unsigned long nr_segs, loff_t pos); 2383 extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, 2384 int datasync); 2385 extern void block_sync_page(struct page *page); 2386 2387 /* fs/splice.c */ 2388 extern ssize_t generic_file_splice_read(struct file *, loff_t *, 2389 struct pipe_inode_info *, size_t, unsigned int); 2390 extern ssize_t default_file_splice_read(struct file *, loff_t *, 2391 struct pipe_inode_info *, size_t, unsigned int); 2392 extern ssize_t generic_file_splice_write(struct pipe_inode_info *, 2393 struct file *, loff_t *, size_t, unsigned int); 2394 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, 2395 struct file *out, loff_t *, size_t len, unsigned int flags); 2396 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, 2397 size_t len, unsigned int flags); 2398 2399 extern void 2400 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); 2401 extern loff_t noop_llseek(struct file *file, loff_t offset, int origin); 2402 extern loff_t no_llseek(struct file *file, loff_t offset, int origin); 2403 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); 2404 extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, 2405 int origin, loff_t maxsize); 2406 extern int generic_file_open(struct inode * inode, struct file * filp); 2407 extern int nonseekable_open(struct inode * inode, struct file * filp); 2408 2409 #ifdef CONFIG_FS_XIP 2410 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, 2411 loff_t *ppos); 2412 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); 2413 extern ssize_t xip_file_write(struct file *filp, const char __user *buf, 2414 size_t len, loff_t *ppos); 2415 extern int xip_truncate_page(struct address_space *mapping, loff_t from); 2416 #else 2417 static inline int xip_truncate_page(struct address_space *mapping, loff_t from) 2418 { 2419 return 0; 2420 } 2421 #endif 2422 2423 #ifdef CONFIG_BLOCK 2424 typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, 2425 loff_t file_offset); 2426 2427 enum { 2428 /* need locking between buffered and direct access */ 2429 DIO_LOCKING = 0x01, 2430 2431 /* filesystem does not support filling holes */ 2432 DIO_SKIP_HOLES = 0x02, 2433 }; 2434 2435 void dio_end_io(struct bio *bio, int error); 2436 void inode_dio_wait(struct inode *inode); 2437 void inode_dio_done(struct inode *inode); 2438 2439 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, 2440 struct block_device *bdev, const struct iovec *iov, loff_t offset, 2441 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, 2442 dio_submit_t submit_io, int flags); 2443 2444 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, 2445 struct inode *inode, const struct iovec *iov, loff_t offset, 2446 unsigned long nr_segs, get_block_t get_block) 2447 { 2448 return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 2449 offset, nr_segs, get_block, NULL, NULL, 2450 DIO_LOCKING | DIO_SKIP_HOLES); 2451 } 2452 #else 2453 static inline void inode_dio_wait(struct inode *inode) 2454 { 2455 } 2456 #endif 2457 2458 extern const struct file_operations generic_ro_fops; 2459 2460 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) 2461 2462 extern int vfs_readlink(struct dentry *, char __user *, int, const char *); 2463 extern int vfs_follow_link(struct nameidata *, const char *); 2464 extern int page_readlink(struct dentry *, char __user *, int); 2465 extern void *page_follow_link_light(struct dentry *, struct nameidata *); 2466 extern void page_put_link(struct dentry *, struct nameidata *, void *); 2467 extern int __page_symlink(struct inode *inode, const char *symname, int len, 2468 int nofs); 2469 extern int page_symlink(struct inode *inode, const char *symname, int len); 2470 extern const struct inode_operations page_symlink_inode_operations; 2471 extern int generic_readlink(struct dentry *, char __user *, int); 2472 extern void generic_fillattr(struct inode *, struct kstat *); 2473 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 2474 void __inode_add_bytes(struct inode *inode, loff_t bytes); 2475 void inode_add_bytes(struct inode *inode, loff_t bytes); 2476 void inode_sub_bytes(struct inode *inode, loff_t bytes); 2477 loff_t inode_get_bytes(struct inode *inode); 2478 void inode_set_bytes(struct inode *inode, loff_t bytes); 2479 2480 extern int vfs_readdir(struct file *, filldir_t, void *); 2481 2482 extern int vfs_stat(const char __user *, struct kstat *); 2483 extern int vfs_lstat(const char __user *, struct kstat *); 2484 extern int vfs_fstat(unsigned int, struct kstat *); 2485 extern int vfs_fstatat(int , const char __user *, struct kstat *, int); 2486 2487 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, 2488 unsigned long arg); 2489 extern int __generic_block_fiemap(struct inode *inode, 2490 struct fiemap_extent_info *fieinfo, 2491 loff_t start, loff_t len, 2492 get_block_t *get_block); 2493 extern int generic_block_fiemap(struct inode *inode, 2494 struct fiemap_extent_info *fieinfo, u64 start, 2495 u64 len, get_block_t *get_block); 2496 2497 extern void get_filesystem(struct file_system_type *fs); 2498 extern void put_filesystem(struct file_system_type *fs); 2499 extern struct file_system_type *get_fs_type(const char *name); 2500 extern struct super_block *get_super(struct block_device *); 2501 extern struct super_block *get_super_thawed(struct block_device *); 2502 extern struct super_block *get_active_super(struct block_device *bdev); 2503 extern void drop_super(struct super_block *sb); 2504 extern void iterate_supers(void (*)(struct super_block *, void *), void *); 2505 extern void iterate_supers_type(struct file_system_type *, 2506 void (*)(struct super_block *, void *), void *); 2507 2508 extern int dcache_dir_open(struct inode *, struct file *); 2509 extern int dcache_dir_close(struct inode *, struct file *); 2510 extern loff_t dcache_dir_lseek(struct file *, loff_t, int); 2511 extern int dcache_readdir(struct file *, void *, filldir_t); 2512 extern int simple_setattr(struct dentry *, struct iattr *); 2513 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); 2514 extern int simple_statfs(struct dentry *, struct kstatfs *); 2515 extern int simple_open(struct inode *inode, struct file *file); 2516 extern int simple_link(struct dentry *, struct inode *, struct dentry *); 2517 extern int simple_unlink(struct inode *, struct dentry *); 2518 extern int simple_rmdir(struct inode *, struct dentry *); 2519 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 2520 extern int noop_fsync(struct file *, loff_t, loff_t, int); 2521 extern int simple_empty(struct dentry *); 2522 extern int simple_readpage(struct file *file, struct page *page); 2523 extern int simple_write_begin(struct file *file, struct address_space *mapping, 2524 loff_t pos, unsigned len, unsigned flags, 2525 struct page **pagep, void **fsdata); 2526 extern int simple_write_end(struct file *file, struct address_space *mapping, 2527 loff_t pos, unsigned len, unsigned copied, 2528 struct page *page, void *fsdata); 2529 2530 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); 2531 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); 2532 extern const struct file_operations simple_dir_operations; 2533 extern const struct inode_operations simple_dir_inode_operations; 2534 struct tree_descr { char *name; const struct file_operations *ops; int mode; }; 2535 struct dentry *d_alloc_name(struct dentry *, const char *); 2536 extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); 2537 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); 2538 extern void simple_release_fs(struct vfsmount **mount, int *count); 2539 2540 extern ssize_t simple_read_from_buffer(void __user *to, size_t count, 2541 loff_t *ppos, const void *from, size_t available); 2542 extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, 2543 const void __user *from, size_t count); 2544 2545 extern int generic_file_fsync(struct file *, loff_t, loff_t, int); 2546 2547 extern int generic_check_addressable(unsigned, u64); 2548 2549 #ifdef CONFIG_MIGRATION 2550 extern int buffer_migrate_page(struct address_space *, 2551 struct page *, struct page *, 2552 enum migrate_mode); 2553 #else 2554 #define buffer_migrate_page NULL 2555 #endif 2556 2557 extern int inode_change_ok(const struct inode *, struct iattr *); 2558 extern int inode_newsize_ok(const struct inode *, loff_t offset); 2559 extern void setattr_copy(struct inode *inode, const struct iattr *attr); 2560 2561 extern void file_update_time(struct file *file); 2562 2563 extern int generic_show_options(struct seq_file *m, struct dentry *root); 2564 extern void save_mount_options(struct super_block *sb, char *options); 2565 extern void replace_mount_options(struct super_block *sb, char *options); 2566 2567 static inline ino_t parent_ino(struct dentry *dentry) 2568 { 2569 ino_t res; 2570 2571 /* 2572 * Don't strictly need d_lock here? If the parent ino could change 2573 * then surely we'd have a deeper race in the caller? 2574 */ 2575 spin_lock(&dentry->d_lock); 2576 res = dentry->d_parent->d_inode->i_ino; 2577 spin_unlock(&dentry->d_lock); 2578 return res; 2579 } 2580 2581 /* Transaction based IO helpers */ 2582 2583 /* 2584 * An argresp is stored in an allocated page and holds the 2585 * size of the argument or response, along with its content 2586 */ 2587 struct simple_transaction_argresp { 2588 ssize_t size; 2589 char data[0]; 2590 }; 2591 2592 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) 2593 2594 char *simple_transaction_get(struct file *file, const char __user *buf, 2595 size_t size); 2596 ssize_t simple_transaction_read(struct file *file, char __user *buf, 2597 size_t size, loff_t *pos); 2598 int simple_transaction_release(struct inode *inode, struct file *file); 2599 2600 void simple_transaction_set(struct file *file, size_t n); 2601 2602 /* 2603 * simple attribute files 2604 * 2605 * These attributes behave similar to those in sysfs: 2606 * 2607 * Writing to an attribute immediately sets a value, an open file can be 2608 * written to multiple times. 2609 * 2610 * Reading from an attribute creates a buffer from the value that might get 2611 * read with multiple read calls. When the attribute has been read 2612 * completely, no further read calls are possible until the file is opened 2613 * again. 2614 * 2615 * All attributes contain a text representation of a numeric value 2616 * that are accessed with the get() and set() functions. 2617 */ 2618 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ 2619 static int __fops ## _open(struct inode *inode, struct file *file) \ 2620 { \ 2621 __simple_attr_check_format(__fmt, 0ull); \ 2622 return simple_attr_open(inode, file, __get, __set, __fmt); \ 2623 } \ 2624 static const struct file_operations __fops = { \ 2625 .owner = THIS_MODULE, \ 2626 .open = __fops ## _open, \ 2627 .release = simple_attr_release, \ 2628 .read = simple_attr_read, \ 2629 .write = simple_attr_write, \ 2630 .llseek = generic_file_llseek, \ 2631 }; 2632 2633 static inline __printf(1, 2) 2634 void __simple_attr_check_format(const char *fmt, ...) 2635 { 2636 /* don't do anything, just let the compiler check the arguments; */ 2637 } 2638 2639 int simple_attr_open(struct inode *inode, struct file *file, 2640 int (*get)(void *, u64 *), int (*set)(void *, u64), 2641 const char *fmt); 2642 int simple_attr_release(struct inode *inode, struct file *file); 2643 ssize_t simple_attr_read(struct file *file, char __user *buf, 2644 size_t len, loff_t *ppos); 2645 ssize_t simple_attr_write(struct file *file, const char __user *buf, 2646 size_t len, loff_t *ppos); 2647 2648 struct ctl_table; 2649 int proc_nr_files(struct ctl_table *table, int write, 2650 void __user *buffer, size_t *lenp, loff_t *ppos); 2651 int proc_nr_dentry(struct ctl_table *table, int write, 2652 void __user *buffer, size_t *lenp, loff_t *ppos); 2653 int proc_nr_inodes(struct ctl_table *table, int write, 2654 void __user *buffer, size_t *lenp, loff_t *ppos); 2655 int __init get_filesystem_list(char *buf); 2656 2657 #define __FMODE_EXEC ((__force int) FMODE_EXEC) 2658 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) 2659 2660 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) 2661 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ 2662 (flag & __FMODE_NONOTIFY))) 2663 2664 static inline int is_sxid(umode_t mode) 2665 { 2666 return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); 2667 } 2668 2669 static inline void inode_has_no_xattr(struct inode *inode) 2670 { 2671 if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) 2672 inode->i_flags |= S_NOSEC; 2673 } 2674 2675 #endif /* __KERNEL__ */ 2676 #endif /* _LINUX_FS_H */ 2677