Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/config.h> |
| 10 | #include <linux/limits.h> |
| 11 | #include <linux/ioctl.h> |
Dipankar Sarma | ab2af1f | 2005-09-09 13:04:13 -0700 | [diff] [blame] | 12 | #include <linux/rcuref.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 NR_OPEN (1024*1024) /* Absolute upper limit on fd num */ |
| 27 | #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ |
| 28 | |
| 29 | #define BLOCK_SIZE_BITS 10 |
| 30 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) |
| 31 | |
| 32 | /* And dynamically-tunable limits and defaults: */ |
| 33 | struct files_stat_struct { |
| 34 | int nr_files; /* read only */ |
| 35 | int nr_free_files; /* read only */ |
| 36 | int max_files; /* tunable */ |
| 37 | }; |
| 38 | extern struct files_stat_struct files_stat; |
| 39 | |
| 40 | struct inodes_stat_t { |
| 41 | int nr_inodes; |
| 42 | int nr_unused; |
| 43 | int dummy[5]; |
| 44 | }; |
| 45 | extern struct inodes_stat_t inodes_stat; |
| 46 | |
| 47 | extern int leases_enable, lease_break_time; |
| 48 | |
| 49 | #ifdef CONFIG_DNOTIFY |
| 50 | extern int dir_notify_enable; |
| 51 | #endif |
| 52 | |
| 53 | #define NR_FILE 8192 /* this can well be larger on a larger system */ |
| 54 | |
| 55 | #define MAY_EXEC 1 |
| 56 | #define MAY_WRITE 2 |
| 57 | #define MAY_READ 4 |
| 58 | #define MAY_APPEND 8 |
| 59 | |
| 60 | #define FMODE_READ 1 |
| 61 | #define FMODE_WRITE 2 |
| 62 | |
| 63 | /* Internal kernel extensions */ |
| 64 | #define FMODE_LSEEK 4 |
| 65 | #define FMODE_PREAD 8 |
| 66 | #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */ |
| 67 | |
| 68 | #define RW_MASK 1 |
| 69 | #define RWA_MASK 2 |
| 70 | #define READ 0 |
| 71 | #define WRITE 1 |
| 72 | #define READA 2 /* read-ahead - don't block if no resources */ |
Jan Kara | a766223 | 2005-09-06 15:19:10 -0700 | [diff] [blame] | 73 | #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #define SPECIAL 4 /* For non-blockdevice requests in request queue */ |
| 75 | #define READ_SYNC (READ | (1 << BIO_RW_SYNC)) |
| 76 | #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) |
| 77 | #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) |
| 78 | |
| 79 | #define SEL_IN 1 |
| 80 | #define SEL_OUT 2 |
| 81 | #define SEL_EX 4 |
| 82 | |
| 83 | /* public flags for file_system_type */ |
| 84 | #define FS_REQUIRES_DEV 1 |
| 85 | #define FS_BINARY_MOUNTDATA 2 |
| 86 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
| 87 | #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon |
| 88 | * as nfs_rename() will be cleaned up |
| 89 | */ |
| 90 | /* |
| 91 | * These are the fs-independent mount-flags: up to 32 flags are supported |
| 92 | */ |
| 93 | #define MS_RDONLY 1 /* Mount read-only */ |
| 94 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ |
| 95 | #define MS_NODEV 4 /* Disallow access to device special files */ |
| 96 | #define MS_NOEXEC 8 /* Disallow program execution */ |
| 97 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ |
| 98 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ |
| 99 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ |
| 100 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ |
| 101 | #define MS_NOATIME 1024 /* Do not update access times. */ |
| 102 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ |
| 103 | #define MS_BIND 4096 |
| 104 | #define MS_MOVE 8192 |
| 105 | #define MS_REC 16384 |
| 106 | #define MS_VERBOSE 32768 |
| 107 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
| 108 | #define MS_ACTIVE (1<<30) |
| 109 | #define MS_NOUSER (1<<31) |
| 110 | |
| 111 | /* |
| 112 | * Superblock flags that can be altered by MS_REMOUNT |
| 113 | */ |
| 114 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\ |
| 115 | MS_NODIRATIME) |
| 116 | |
| 117 | /* |
| 118 | * Old magic mount flag and mask |
| 119 | */ |
| 120 | #define MS_MGC_VAL 0xC0ED0000 |
| 121 | #define MS_MGC_MSK 0xffff0000 |
| 122 | |
| 123 | /* Inode flags - they have nothing to superblock flags now */ |
| 124 | |
| 125 | #define S_SYNC 1 /* Writes are synced at once */ |
| 126 | #define S_NOATIME 2 /* Do not update access times */ |
| 127 | #define S_APPEND 4 /* Append-only file */ |
| 128 | #define S_IMMUTABLE 8 /* Immutable file */ |
| 129 | #define S_DEAD 16 /* removed, but still open directory */ |
| 130 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
| 131 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
| 132 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
| 133 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
| 134 | #define S_PRIVATE 512 /* Inode is fs-internal */ |
| 135 | |
| 136 | /* |
| 137 | * Note that nosuid etc flags are inode-specific: setting some file-system |
| 138 | * flags just means all the inodes inherit those flags by default. It might be |
| 139 | * possible to override it selectively if you really wanted to with some |
| 140 | * ioctl() that is not currently implemented. |
| 141 | * |
| 142 | * Exception: MS_RDONLY is always applied to the entire file system. |
| 143 | * |
| 144 | * Unfortunately, it is possible to change a filesystems flags with it mounted |
| 145 | * with files in use. This means that all of the inodes will not have their |
| 146 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| 147 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| 148 | */ |
| 149 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) |
| 150 | |
| 151 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| 152 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| 153 | ((inode)->i_flags & S_SYNC)) |
| 154 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| 155 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| 156 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
| 157 | |
| 158 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| 159 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| 160 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
| 161 | #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME)) |
| 162 | #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME) |
| 163 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| 164 | |
| 165 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| 166 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| 167 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| 168 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
| 169 | |
| 170 | /* the read-only stuff doesn't really belong here, but any other place is |
| 171 | probably as bad and I don't want to create yet another include file. */ |
| 172 | |
| 173 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ |
| 174 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ |
| 175 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ |
| 176 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ |
| 177 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ |
| 178 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ |
| 179 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ |
| 180 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ |
| 181 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ |
| 182 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ |
| 183 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ |
| 184 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ |
| 185 | #if 0 |
| 186 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ |
| 187 | |
| 188 | /* Some people are morons. Do not use sizeof! */ |
| 189 | |
| 190 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ |
| 191 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ |
| 192 | /* This was here just to show that the number is taken - |
| 193 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ |
| 194 | #endif |
| 195 | /* A jump here: 108-111 have been used for various private purposes. */ |
| 196 | #define BLKBSZGET _IOR(0x12,112,size_t) |
| 197 | #define BLKBSZSET _IOW(0x12,113,size_t) |
| 198 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ |
| 199 | |
| 200 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ |
| 201 | #define FIBMAP _IO(0x00,1) /* bmap access */ |
| 202 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ |
| 203 | |
| 204 | #ifdef __KERNEL__ |
| 205 | |
| 206 | #include <linux/linkage.h> |
| 207 | #include <linux/wait.h> |
| 208 | #include <linux/types.h> |
| 209 | #include <linux/kdev_t.h> |
| 210 | #include <linux/dcache.h> |
| 211 | #include <linux/stat.h> |
| 212 | #include <linux/cache.h> |
| 213 | #include <linux/kobject.h> |
| 214 | #include <linux/list.h> |
| 215 | #include <linux/radix-tree.h> |
| 216 | #include <linux/prio_tree.h> |
| 217 | #include <linux/init.h> |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 218 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | #include <asm/atomic.h> |
| 221 | #include <asm/semaphore.h> |
| 222 | #include <asm/byteorder.h> |
| 223 | |
| 224 | struct iovec; |
| 225 | struct nameidata; |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 226 | struct kiocb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | struct pipe_inode_info; |
| 228 | struct poll_table_struct; |
| 229 | struct kstatfs; |
| 230 | struct vm_area_struct; |
| 231 | struct vfsmount; |
| 232 | |
| 233 | /* Used to be a macro which just called the function, now just a function */ |
| 234 | extern void update_atime (struct inode *); |
| 235 | |
| 236 | extern void __init inode_init(unsigned long); |
| 237 | extern void __init inode_init_early(void); |
| 238 | extern void __init mnt_init(unsigned long); |
| 239 | extern void __init files_init(unsigned long); |
| 240 | |
| 241 | struct buffer_head; |
| 242 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
| 243 | struct buffer_head *bh_result, int create); |
| 244 | typedef int (get_blocks_t)(struct inode *inode, sector_t iblock, |
| 245 | unsigned long max_blocks, |
| 246 | struct buffer_head *bh_result, int create); |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 247 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | ssize_t bytes, void *private); |
| 249 | |
| 250 | /* |
| 251 | * Attribute flags. These should be or-ed together to figure out what |
| 252 | * has been changed! |
| 253 | */ |
| 254 | #define ATTR_MODE 1 |
| 255 | #define ATTR_UID 2 |
| 256 | #define ATTR_GID 4 |
| 257 | #define ATTR_SIZE 8 |
| 258 | #define ATTR_ATIME 16 |
| 259 | #define ATTR_MTIME 32 |
| 260 | #define ATTR_CTIME 64 |
| 261 | #define ATTR_ATIME_SET 128 |
| 262 | #define ATTR_MTIME_SET 256 |
| 263 | #define ATTR_FORCE 512 /* Not a change, but a change it */ |
| 264 | #define ATTR_ATTR_FLAG 1024 |
| 265 | #define ATTR_KILL_SUID 2048 |
| 266 | #define ATTR_KILL_SGID 4096 |
| 267 | |
| 268 | /* |
| 269 | * This is the Inode Attributes structure, used for notify_change(). It |
| 270 | * uses the above definitions as flags, to know which values have changed. |
| 271 | * Also, in this manner, a Filesystem can look at only the values it cares |
| 272 | * about. Basically, these are the attributes that the VFS layer can |
| 273 | * request to change from the FS layer. |
| 274 | * |
| 275 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
| 276 | */ |
| 277 | struct iattr { |
| 278 | unsigned int ia_valid; |
| 279 | umode_t ia_mode; |
| 280 | uid_t ia_uid; |
| 281 | gid_t ia_gid; |
| 282 | loff_t ia_size; |
| 283 | struct timespec ia_atime; |
| 284 | struct timespec ia_mtime; |
| 285 | struct timespec ia_ctime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | }; |
| 287 | |
| 288 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | * Includes for diskquotas. |
| 290 | */ |
| 291 | #include <linux/quota.h> |
| 292 | |
| 293 | /* |
| 294 | * oh the beauties of C type declarations. |
| 295 | */ |
| 296 | struct page; |
| 297 | struct address_space; |
| 298 | struct writeback_control; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | struct address_space_operations { |
| 301 | int (*writepage)(struct page *page, struct writeback_control *wbc); |
| 302 | int (*readpage)(struct file *, struct page *); |
| 303 | int (*sync_page)(struct page *); |
| 304 | |
| 305 | /* Write back some dirty pages from this mapping. */ |
| 306 | int (*writepages)(struct address_space *, struct writeback_control *); |
| 307 | |
| 308 | /* Set a page dirty */ |
| 309 | int (*set_page_dirty)(struct page *page); |
| 310 | |
| 311 | int (*readpages)(struct file *filp, struct address_space *mapping, |
| 312 | struct list_head *pages, unsigned nr_pages); |
| 313 | |
| 314 | /* |
| 315 | * ext3 requires that a successful prepare_write() call be followed |
| 316 | * by a commit_write() call - they must be balanced |
| 317 | */ |
| 318 | int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); |
| 319 | int (*commit_write)(struct file *, struct page *, unsigned, unsigned); |
| 320 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
| 321 | sector_t (*bmap)(struct address_space *, sector_t); |
| 322 | int (*invalidatepage) (struct page *, unsigned long); |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 323 | int (*releasepage) (struct page *, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
| 325 | loff_t offset, unsigned long nr_segs); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 326 | struct page* (*get_xip_page)(struct address_space *, sector_t, |
| 327 | int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | }; |
| 329 | |
| 330 | struct backing_dev_info; |
| 331 | struct address_space { |
| 332 | struct inode *host; /* owner: inode, block_device */ |
| 333 | struct radix_tree_root page_tree; /* radix tree of all pages */ |
| 334 | rwlock_t tree_lock; /* and rwlock protecting it */ |
| 335 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
| 336 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ |
| 337 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ |
| 338 | spinlock_t i_mmap_lock; /* protect tree, count, list */ |
| 339 | unsigned int truncate_count; /* Cover race condition with truncate */ |
| 340 | unsigned long nrpages; /* number of total pages */ |
| 341 | pgoff_t writeback_index;/* writeback starts here */ |
| 342 | struct address_space_operations *a_ops; /* methods */ |
| 343 | unsigned long flags; /* error bits/gfp mask */ |
| 344 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ |
| 345 | spinlock_t private_lock; /* for use by the address_space */ |
| 346 | struct list_head private_list; /* ditto */ |
| 347 | struct address_space *assoc_mapping; /* ditto */ |
| 348 | } __attribute__((aligned(sizeof(long)))); |
| 349 | /* |
| 350 | * On most architectures that alignment is already the case; but |
| 351 | * must be enforced here for CRIS, to let the least signficant bit |
| 352 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
| 353 | */ |
| 354 | |
| 355 | struct block_device { |
| 356 | dev_t bd_dev; /* not a kdev_t - it's a search key */ |
| 357 | struct inode * bd_inode; /* will die */ |
| 358 | int bd_openers; |
| 359 | struct semaphore bd_sem; /* open/close mutex */ |
| 360 | struct semaphore bd_mount_sem; /* mount mutex */ |
| 361 | struct list_head bd_inodes; |
| 362 | void * bd_holder; |
| 363 | int bd_holders; |
| 364 | struct block_device * bd_contains; |
| 365 | unsigned bd_block_size; |
| 366 | struct hd_struct * bd_part; |
| 367 | /* number of times partitions within this device have been opened. */ |
| 368 | unsigned bd_part_count; |
| 369 | int bd_invalidated; |
| 370 | struct gendisk * bd_disk; |
| 371 | struct list_head bd_list; |
| 372 | struct backing_dev_info *bd_inode_backing_dev_info; |
| 373 | /* |
| 374 | * Private data. You must have bd_claim'ed the block_device |
| 375 | * to use this. NOTE: bd_claim allows an owner to claim |
| 376 | * the same device multiple times, the owner must take special |
| 377 | * care to not mess up bd_private for that case. |
| 378 | */ |
| 379 | unsigned long bd_private; |
| 380 | }; |
| 381 | |
| 382 | /* |
| 383 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
| 384 | * radix trees |
| 385 | */ |
| 386 | #define PAGECACHE_TAG_DIRTY 0 |
| 387 | #define PAGECACHE_TAG_WRITEBACK 1 |
| 388 | |
| 389 | int mapping_tagged(struct address_space *mapping, int tag); |
| 390 | |
| 391 | /* |
| 392 | * Might pages of this file be mapped into userspace? |
| 393 | */ |
| 394 | static inline int mapping_mapped(struct address_space *mapping) |
| 395 | { |
| 396 | return !prio_tree_empty(&mapping->i_mmap) || |
| 397 | !list_empty(&mapping->i_mmap_nonlinear); |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Might pages of this file have been modified in userspace? |
| 402 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
| 403 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
| 404 | * writing i.e. vma may be mprotected writable even if now readonly. |
| 405 | */ |
| 406 | static inline int mapping_writably_mapped(struct address_space *mapping) |
| 407 | { |
| 408 | return mapping->i_mmap_writable != 0; |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * Use sequence counter to get consistent i_size on 32-bit processors. |
| 413 | */ |
| 414 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 415 | #include <linux/seqlock.h> |
| 416 | #define __NEED_I_SIZE_ORDERED |
| 417 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
| 418 | #else |
| 419 | #define i_size_ordered_init(inode) do { } while (0) |
| 420 | #endif |
| 421 | |
| 422 | struct inode { |
| 423 | struct hlist_node i_hash; |
| 424 | struct list_head i_list; |
| 425 | struct list_head i_sb_list; |
| 426 | struct list_head i_dentry; |
| 427 | unsigned long i_ino; |
| 428 | atomic_t i_count; |
| 429 | umode_t i_mode; |
| 430 | unsigned int i_nlink; |
| 431 | uid_t i_uid; |
| 432 | gid_t i_gid; |
| 433 | dev_t i_rdev; |
| 434 | loff_t i_size; |
| 435 | struct timespec i_atime; |
| 436 | struct timespec i_mtime; |
| 437 | struct timespec i_ctime; |
| 438 | unsigned int i_blkbits; |
| 439 | unsigned long i_blksize; |
| 440 | unsigned long i_version; |
| 441 | unsigned long i_blocks; |
| 442 | unsigned short i_bytes; |
| 443 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
| 444 | struct semaphore i_sem; |
| 445 | struct rw_semaphore i_alloc_sem; |
| 446 | struct inode_operations *i_op; |
| 447 | struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
| 448 | struct super_block *i_sb; |
| 449 | struct file_lock *i_flock; |
| 450 | struct address_space *i_mapping; |
| 451 | struct address_space i_data; |
| 452 | #ifdef CONFIG_QUOTA |
| 453 | struct dquot *i_dquot[MAXQUOTAS]; |
| 454 | #endif |
| 455 | /* These three should probably be a union */ |
| 456 | struct list_head i_devices; |
| 457 | struct pipe_inode_info *i_pipe; |
| 458 | struct block_device *i_bdev; |
| 459 | struct cdev *i_cdev; |
| 460 | int i_cindex; |
| 461 | |
| 462 | __u32 i_generation; |
| 463 | |
| 464 | #ifdef CONFIG_DNOTIFY |
| 465 | unsigned long i_dnotify_mask; /* Directory notify events */ |
| 466 | struct dnotify_struct *i_dnotify; /* for directory notifications */ |
| 467 | #endif |
| 468 | |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 469 | #ifdef CONFIG_INOTIFY |
| 470 | struct list_head inotify_watches; /* watches on this inode */ |
| 471 | struct semaphore inotify_sem; /* protects the watches list */ |
| 472 | #endif |
| 473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | unsigned long i_state; |
| 475 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
| 476 | |
| 477 | unsigned int i_flags; |
| 478 | |
| 479 | atomic_t i_writecount; |
| 480 | void *i_security; |
| 481 | union { |
| 482 | void *generic_ip; |
| 483 | } u; |
| 484 | #ifdef __NEED_I_SIZE_ORDERED |
| 485 | seqcount_t i_size_seqcount; |
| 486 | #endif |
| 487 | }; |
| 488 | |
| 489 | /* |
| 490 | * NOTE: in a 32bit arch with a preemptable kernel and |
| 491 | * an UP compile the i_size_read/write must be atomic |
| 492 | * with respect to the local cpu (unlike with preempt disabled), |
| 493 | * but they don't need to be atomic with respect to other cpus like in |
| 494 | * true SMP (so they need either to either locally disable irq around |
| 495 | * the read or for example on x86 they can be still implemented as a |
| 496 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
| 497 | * and 64bit archs it makes no difference if preempt is enabled or not. |
| 498 | */ |
| 499 | static inline loff_t i_size_read(struct inode *inode) |
| 500 | { |
| 501 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 502 | loff_t i_size; |
| 503 | unsigned int seq; |
| 504 | |
| 505 | do { |
| 506 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
| 507 | i_size = inode->i_size; |
| 508 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
| 509 | return i_size; |
| 510 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 511 | loff_t i_size; |
| 512 | |
| 513 | preempt_disable(); |
| 514 | i_size = inode->i_size; |
| 515 | preempt_enable(); |
| 516 | return i_size; |
| 517 | #else |
| 518 | return inode->i_size; |
| 519 | #endif |
| 520 | } |
| 521 | |
| 522 | |
| 523 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
| 524 | { |
| 525 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 526 | write_seqcount_begin(&inode->i_size_seqcount); |
| 527 | inode->i_size = i_size; |
| 528 | write_seqcount_end(&inode->i_size_seqcount); |
| 529 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 530 | preempt_disable(); |
| 531 | inode->i_size = i_size; |
| 532 | preempt_enable(); |
| 533 | #else |
| 534 | inode->i_size = i_size; |
| 535 | #endif |
| 536 | } |
| 537 | |
| 538 | static inline unsigned iminor(struct inode *inode) |
| 539 | { |
| 540 | return MINOR(inode->i_rdev); |
| 541 | } |
| 542 | |
| 543 | static inline unsigned imajor(struct inode *inode) |
| 544 | { |
| 545 | return MAJOR(inode->i_rdev); |
| 546 | } |
| 547 | |
| 548 | extern struct block_device *I_BDEV(struct inode *inode); |
| 549 | |
| 550 | struct fown_struct { |
| 551 | rwlock_t lock; /* protects pid, uid, euid fields */ |
| 552 | int pid; /* pid or -pgrp where SIGIO should be sent */ |
| 553 | uid_t uid, euid; /* uid/euid of process setting the owner */ |
| 554 | void *security; |
| 555 | int signum; /* posix.1b rt signal to be delivered on IO */ |
| 556 | }; |
| 557 | |
| 558 | /* |
| 559 | * Track a single file's readahead state |
| 560 | */ |
| 561 | struct file_ra_state { |
| 562 | unsigned long start; /* Current window */ |
| 563 | unsigned long size; |
| 564 | unsigned long flags; /* ra flags RA_FLAG_xxx*/ |
| 565 | unsigned long cache_hit; /* cache hit count*/ |
| 566 | unsigned long prev_page; /* Cache last read() position */ |
| 567 | unsigned long ahead_start; /* Ahead window */ |
| 568 | unsigned long ahead_size; |
| 569 | unsigned long ra_pages; /* Maximum readahead window */ |
| 570 | unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ |
| 571 | unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ |
| 572 | }; |
| 573 | #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ |
| 574 | #define RA_FLAG_INCACHE 0x02 /* file is already in cache */ |
| 575 | |
| 576 | struct file { |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 577 | /* |
| 578 | * fu_list becomes invalid after file_free is called and queued via |
| 579 | * fu_rcuhead for RCU freeing |
| 580 | */ |
| 581 | union { |
| 582 | struct list_head fu_list; |
| 583 | struct rcu_head fu_rcuhead; |
| 584 | } f_u; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | struct dentry *f_dentry; |
| 586 | struct vfsmount *f_vfsmnt; |
| 587 | struct file_operations *f_op; |
| 588 | atomic_t f_count; |
| 589 | unsigned int f_flags; |
| 590 | mode_t f_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | loff_t f_pos; |
| 592 | struct fown_struct f_owner; |
| 593 | unsigned int f_uid, f_gid; |
| 594 | struct file_ra_state f_ra; |
| 595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | unsigned long f_version; |
| 597 | void *f_security; |
| 598 | |
| 599 | /* needed for tty driver, and maybe others */ |
| 600 | void *private_data; |
| 601 | |
| 602 | #ifdef CONFIG_EPOLL |
| 603 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
| 604 | struct list_head f_ep_links; |
| 605 | spinlock_t f_ep_lock; |
| 606 | #endif /* #ifdef CONFIG_EPOLL */ |
| 607 | struct address_space *f_mapping; |
| 608 | }; |
| 609 | extern spinlock_t files_lock; |
| 610 | #define file_list_lock() spin_lock(&files_lock); |
| 611 | #define file_list_unlock() spin_unlock(&files_lock); |
| 612 | |
Dipankar Sarma | ab2af1f | 2005-09-09 13:04:13 -0700 | [diff] [blame] | 613 | #define get_file(x) rcuref_inc(&(x)->f_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | #define file_count(x) atomic_read(&(x)->f_count) |
| 615 | |
| 616 | #define MAX_NON_LFS ((1UL<<31) - 1) |
| 617 | |
| 618 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
| 619 | limits, otherwise bad things can happen in VM. */ |
| 620 | #if BITS_PER_LONG==32 |
| 621 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
| 622 | #elif BITS_PER_LONG==64 |
| 623 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL |
| 624 | #endif |
| 625 | |
| 626 | #define FL_POSIX 1 |
| 627 | #define FL_FLOCK 2 |
| 628 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
| 629 | #define FL_LOCKD 16 /* lock held by rpc.lockd */ |
| 630 | #define FL_LEASE 32 /* lease held on this file */ |
| 631 | #define FL_SLEEP 128 /* A blocking lock */ |
| 632 | |
| 633 | /* |
| 634 | * The POSIX file lock owner is determined by |
| 635 | * the "struct files_struct" in the thread group |
| 636 | * (or NULL for no owner - BSD locks). |
| 637 | * |
| 638 | * Lockd stuffs a "host" pointer into this. |
| 639 | */ |
| 640 | typedef struct files_struct *fl_owner_t; |
| 641 | |
| 642 | struct file_lock_operations { |
| 643 | void (*fl_insert)(struct file_lock *); /* lock insertion callback */ |
| 644 | void (*fl_remove)(struct file_lock *); /* lock removal callback */ |
| 645 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| 646 | void (*fl_release_private)(struct file_lock *); |
| 647 | }; |
| 648 | |
| 649 | struct lock_manager_operations { |
| 650 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); |
| 651 | void (*fl_notify)(struct file_lock *); /* unblock callback */ |
| 652 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| 653 | void (*fl_release_private)(struct file_lock *); |
| 654 | void (*fl_break)(struct file_lock *); |
| 655 | int (*fl_mylease)(struct file_lock *, struct file_lock *); |
| 656 | int (*fl_change)(struct file_lock **, int); |
| 657 | }; |
| 658 | |
| 659 | /* that will die - we need it for nfs_lock_info */ |
| 660 | #include <linux/nfs_fs_i.h> |
| 661 | |
| 662 | struct file_lock { |
| 663 | struct file_lock *fl_next; /* singly linked list for this inode */ |
| 664 | struct list_head fl_link; /* doubly linked list of all locks */ |
| 665 | struct list_head fl_block; /* circular list of blocked processes */ |
| 666 | fl_owner_t fl_owner; |
| 667 | unsigned int fl_pid; |
| 668 | wait_queue_head_t fl_wait; |
| 669 | struct file *fl_file; |
| 670 | unsigned char fl_flags; |
| 671 | unsigned char fl_type; |
| 672 | loff_t fl_start; |
| 673 | loff_t fl_end; |
| 674 | |
| 675 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
| 676 | unsigned long fl_break_time; /* for nonblocking lease breaks */ |
| 677 | |
| 678 | struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
| 679 | struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
| 680 | union { |
| 681 | struct nfs_lock_info nfs_fl; |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 682 | struct nfs4_lock_info nfs4_fl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } fl_u; |
| 684 | }; |
| 685 | |
| 686 | /* The following constant reflects the upper bound of the file/locking space */ |
| 687 | #ifndef OFFSET_MAX |
| 688 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
| 689 | #define OFFSET_MAX INT_LIMIT(loff_t) |
| 690 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
| 691 | #endif |
| 692 | |
| 693 | extern struct list_head file_lock_list; |
| 694 | |
| 695 | #include <linux/fcntl.h> |
| 696 | |
| 697 | extern int fcntl_getlk(struct file *, struct flock __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 698 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
| 699 | struct flock __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
| 701 | #if BITS_PER_LONG == 32 |
| 702 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 703 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
| 704 | struct flock64 __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | #endif |
| 706 | |
| 707 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
| 708 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
| 709 | extern int fcntl_getlease(struct file *filp); |
| 710 | |
| 711 | /* fs/locks.c */ |
| 712 | extern void locks_init_lock(struct file_lock *); |
| 713 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
| 714 | extern void locks_remove_posix(struct file *, fl_owner_t); |
| 715 | extern void locks_remove_flock(struct file *); |
| 716 | extern struct file_lock *posix_test_lock(struct file *, struct file_lock *); |
| 717 | extern int posix_lock_file(struct file *, struct file_lock *); |
| 718 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
| 719 | extern void posix_block_lock(struct file_lock *, struct file_lock *); |
| 720 | extern void posix_unblock_lock(struct file *, struct file_lock *); |
| 721 | extern int posix_locks_deadlock(struct file_lock *, struct file_lock *); |
| 722 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
| 723 | extern int __break_lease(struct inode *inode, unsigned int flags); |
| 724 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
| 725 | extern int setlease(struct file *, long, struct file_lock **); |
| 726 | extern int lease_modify(struct file_lock **, int); |
| 727 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); |
| 728 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); |
| 729 | extern void steal_locks(fl_owner_t from); |
| 730 | |
| 731 | struct fasync_struct { |
| 732 | int magic; |
| 733 | int fa_fd; |
| 734 | struct fasync_struct *fa_next; /* singly linked list */ |
| 735 | struct file *fa_file; |
| 736 | }; |
| 737 | |
| 738 | #define FASYNC_MAGIC 0x4601 |
| 739 | |
| 740 | /* SMP safe fasync helpers: */ |
| 741 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
| 742 | /* can be called from interrupts */ |
| 743 | extern void kill_fasync(struct fasync_struct **, int, int); |
| 744 | /* only for net: no internal synchronization */ |
| 745 | extern void __kill_fasync(struct fasync_struct *, int, int); |
| 746 | |
| 747 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
| 748 | extern void f_delown(struct file *filp); |
| 749 | extern int send_sigurg(struct fown_struct *fown); |
| 750 | |
| 751 | /* |
| 752 | * Umount options |
| 753 | */ |
| 754 | |
| 755 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
| 756 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
| 757 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
| 758 | |
| 759 | extern struct list_head super_blocks; |
| 760 | extern spinlock_t sb_lock; |
| 761 | |
| 762 | #define sb_entry(list) list_entry((list), struct super_block, s_list) |
| 763 | #define S_BIAS (1<<30) |
| 764 | struct super_block { |
| 765 | struct list_head s_list; /* Keep this first */ |
| 766 | dev_t s_dev; /* search index; _not_ kdev_t */ |
| 767 | unsigned long s_blocksize; |
| 768 | unsigned long s_old_blocksize; |
| 769 | unsigned char s_blocksize_bits; |
| 770 | unsigned char s_dirt; |
| 771 | unsigned long long s_maxbytes; /* Max file size */ |
| 772 | struct file_system_type *s_type; |
| 773 | struct super_operations *s_op; |
| 774 | struct dquot_operations *dq_op; |
| 775 | struct quotactl_ops *s_qcop; |
| 776 | struct export_operations *s_export_op; |
| 777 | unsigned long s_flags; |
| 778 | unsigned long s_magic; |
| 779 | struct dentry *s_root; |
| 780 | struct rw_semaphore s_umount; |
| 781 | struct semaphore s_lock; |
| 782 | int s_count; |
| 783 | int s_syncing; |
| 784 | int s_need_sync_fs; |
| 785 | atomic_t s_active; |
| 786 | void *s_security; |
| 787 | struct xattr_handler **s_xattr; |
| 788 | |
| 789 | struct list_head s_inodes; /* all inodes */ |
| 790 | struct list_head s_dirty; /* dirty inodes */ |
| 791 | struct list_head s_io; /* parked for writeback */ |
| 792 | struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ |
| 793 | struct list_head s_files; |
| 794 | |
| 795 | struct block_device *s_bdev; |
| 796 | struct list_head s_instances; |
| 797 | struct quota_info s_dquot; /* Diskquota specific options */ |
| 798 | |
| 799 | int s_frozen; |
| 800 | wait_queue_head_t s_wait_unfrozen; |
| 801 | |
| 802 | char s_id[32]; /* Informational name */ |
| 803 | |
| 804 | void *s_fs_info; /* Filesystem private info */ |
| 805 | |
| 806 | /* |
| 807 | * The next field is for VFS *only*. No filesystems have any business |
| 808 | * even looking at it. You had been warned. |
| 809 | */ |
| 810 | struct semaphore s_vfs_rename_sem; /* Kludge */ |
| 811 | |
| 812 | /* Granuality of c/m/atime in ns. |
| 813 | Cannot be worse than a second */ |
| 814 | u32 s_time_gran; |
| 815 | }; |
| 816 | |
| 817 | extern struct timespec current_fs_time(struct super_block *sb); |
| 818 | |
| 819 | /* |
| 820 | * Snapshotting support. |
| 821 | */ |
| 822 | enum { |
| 823 | SB_UNFROZEN = 0, |
| 824 | SB_FREEZE_WRITE = 1, |
| 825 | SB_FREEZE_TRANS = 2, |
| 826 | }; |
| 827 | |
| 828 | #define vfs_check_frozen(sb, level) \ |
| 829 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) |
| 830 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 831 | static inline void get_fs_excl(void) |
| 832 | { |
| 833 | atomic_inc(¤t->fs_excl); |
| 834 | } |
| 835 | |
| 836 | static inline void put_fs_excl(void) |
| 837 | { |
| 838 | atomic_dec(¤t->fs_excl); |
| 839 | } |
| 840 | |
| 841 | static inline int has_fs_excl(void) |
| 842 | { |
| 843 | return atomic_read(¤t->fs_excl); |
| 844 | } |
| 845 | |
| 846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | /* |
| 848 | * Superblock locking. |
| 849 | */ |
| 850 | static inline void lock_super(struct super_block * sb) |
| 851 | { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 852 | get_fs_excl(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | down(&sb->s_lock); |
| 854 | } |
| 855 | |
| 856 | static inline void unlock_super(struct super_block * sb) |
| 857 | { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 858 | put_fs_excl(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | up(&sb->s_lock); |
| 860 | } |
| 861 | |
| 862 | /* |
| 863 | * VFS helper functions.. |
| 864 | */ |
| 865 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
| 866 | extern int vfs_mkdir(struct inode *, struct dentry *, int); |
| 867 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); |
| 868 | extern int vfs_symlink(struct inode *, struct dentry *, const char *, int); |
| 869 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
| 870 | extern int vfs_rmdir(struct inode *, struct dentry *); |
| 871 | extern int vfs_unlink(struct inode *, struct dentry *); |
| 872 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
| 873 | |
| 874 | /* |
| 875 | * VFS dentry helper functions. |
| 876 | */ |
| 877 | extern void dentry_unhash(struct dentry *dentry); |
| 878 | |
| 879 | /* |
| 880 | * File types |
| 881 | * |
| 882 | * NOTE! These match bits 12..15 of stat.st_mode |
| 883 | * (ie "(i_mode >> 12) & 15"). |
| 884 | */ |
| 885 | #define DT_UNKNOWN 0 |
| 886 | #define DT_FIFO 1 |
| 887 | #define DT_CHR 2 |
| 888 | #define DT_DIR 4 |
| 889 | #define DT_BLK 6 |
| 890 | #define DT_REG 8 |
| 891 | #define DT_LNK 10 |
| 892 | #define DT_SOCK 12 |
| 893 | #define DT_WHT 14 |
| 894 | |
| 895 | #define OSYNC_METADATA (1<<0) |
| 896 | #define OSYNC_DATA (1<<1) |
| 897 | #define OSYNC_INODE (1<<2) |
| 898 | int generic_osync_inode(struct inode *, struct address_space *, int); |
| 899 | |
| 900 | /* |
| 901 | * This is the "filldir" function type, used by readdir() to let |
| 902 | * the kernel specify what kind of dirent layout it wants to have. |
| 903 | * This allows the kernel to read directories into kernel space or |
| 904 | * to have different dirent layouts depending on the binary type. |
| 905 | */ |
| 906 | typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned); |
| 907 | |
| 908 | struct block_device_operations { |
| 909 | int (*open) (struct inode *, struct file *); |
| 910 | int (*release) (struct inode *, struct file *); |
| 911 | int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long); |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 912 | long (*unlocked_ioctl) (struct file *, unsigned, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | long (*compat_ioctl) (struct file *, unsigned, unsigned long); |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 914 | int (*direct_access) (struct block_device *, sector_t, unsigned long *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | int (*media_changed) (struct gendisk *); |
| 916 | int (*revalidate_disk) (struct gendisk *); |
| 917 | struct module *owner; |
| 918 | }; |
| 919 | |
| 920 | /* |
| 921 | * "descriptor" for what we're up to with a read for sendfile(). |
| 922 | * This allows us to use the same read code yet |
| 923 | * have multiple different users of the data that |
| 924 | * we read from a file. |
| 925 | * |
| 926 | * The simplest case just copies the data to user |
| 927 | * mode. |
| 928 | */ |
| 929 | typedef struct { |
| 930 | size_t written; |
| 931 | size_t count; |
| 932 | union { |
| 933 | char __user * buf; |
| 934 | void *data; |
| 935 | } arg; |
| 936 | int error; |
| 937 | } read_descriptor_t; |
| 938 | |
| 939 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); |
| 940 | |
| 941 | /* These macros are for out of kernel modules to test that |
| 942 | * the kernel supports the unlocked_ioctl and compat_ioctl |
| 943 | * fields in struct file_operations. */ |
| 944 | #define HAVE_COMPAT_IOCTL 1 |
| 945 | #define HAVE_UNLOCKED_IOCTL 1 |
| 946 | |
| 947 | /* |
| 948 | * NOTE: |
| 949 | * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl |
| 950 | * can be called without the big kernel lock held in all filesystems. |
| 951 | */ |
| 952 | struct file_operations { |
| 953 | struct module *owner; |
| 954 | loff_t (*llseek) (struct file *, loff_t, int); |
| 955 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
| 956 | ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t); |
| 957 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
| 958 | ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t); |
| 959 | int (*readdir) (struct file *, void *, filldir_t); |
| 960 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
| 961 | int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); |
| 962 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
| 963 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
| 964 | int (*mmap) (struct file *, struct vm_area_struct *); |
| 965 | int (*open) (struct inode *, struct file *); |
| 966 | int (*flush) (struct file *); |
| 967 | int (*release) (struct inode *, struct file *); |
| 968 | int (*fsync) (struct file *, struct dentry *, int datasync); |
| 969 | int (*aio_fsync) (struct kiocb *, int datasync); |
| 970 | int (*fasync) (int, struct file *, int); |
| 971 | int (*lock) (struct file *, int, struct file_lock *); |
| 972 | ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *); |
| 973 | ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *); |
| 974 | ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); |
| 975 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
| 976 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 977 | int (*check_flags)(int); |
| 978 | int (*dir_notify)(struct file *filp, unsigned long arg); |
| 979 | int (*flock) (struct file *, int, struct file_lock *); |
| 980 | }; |
| 981 | |
| 982 | struct inode_operations { |
| 983 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); |
| 984 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); |
| 985 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
| 986 | int (*unlink) (struct inode *,struct dentry *); |
| 987 | int (*symlink) (struct inode *,struct dentry *,const char *); |
| 988 | int (*mkdir) (struct inode *,struct dentry *,int); |
| 989 | int (*rmdir) (struct inode *,struct dentry *); |
| 990 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); |
| 991 | int (*rename) (struct inode *, struct dentry *, |
| 992 | struct inode *, struct dentry *); |
| 993 | int (*readlink) (struct dentry *, char __user *,int); |
Linus Torvalds | cc314ee | 2005-08-19 18:02:56 -0700 | [diff] [blame] | 994 | void * (*follow_link) (struct dentry *, struct nameidata *); |
| 995 | void (*put_link) (struct dentry *, struct nameidata *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | void (*truncate) (struct inode *); |
| 997 | int (*permission) (struct inode *, int, struct nameidata *); |
| 998 | int (*setattr) (struct dentry *, struct iattr *); |
| 999 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
| 1000 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
| 1001 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
| 1002 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
| 1003 | int (*removexattr) (struct dentry *, const char *); |
| 1004 | }; |
| 1005 | |
| 1006 | struct seq_file; |
| 1007 | |
| 1008 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
| 1009 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
| 1010 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
| 1011 | unsigned long, loff_t *); |
| 1012 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
| 1013 | unsigned long, loff_t *); |
| 1014 | |
| 1015 | /* |
| 1016 | * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called |
| 1017 | * without the big kernel lock held in all filesystems. |
| 1018 | */ |
| 1019 | struct super_operations { |
| 1020 | struct inode *(*alloc_inode)(struct super_block *sb); |
| 1021 | void (*destroy_inode)(struct inode *); |
| 1022 | |
| 1023 | void (*read_inode) (struct inode *); |
| 1024 | |
| 1025 | void (*dirty_inode) (struct inode *); |
| 1026 | int (*write_inode) (struct inode *, int); |
| 1027 | void (*put_inode) (struct inode *); |
| 1028 | void (*drop_inode) (struct inode *); |
| 1029 | void (*delete_inode) (struct inode *); |
| 1030 | void (*put_super) (struct super_block *); |
| 1031 | void (*write_super) (struct super_block *); |
| 1032 | int (*sync_fs)(struct super_block *sb, int wait); |
| 1033 | void (*write_super_lockfs) (struct super_block *); |
| 1034 | void (*unlockfs) (struct super_block *); |
| 1035 | int (*statfs) (struct super_block *, struct kstatfs *); |
| 1036 | int (*remount_fs) (struct super_block *, int *, char *); |
| 1037 | void (*clear_inode) (struct inode *); |
| 1038 | void (*umount_begin) (struct super_block *); |
| 1039 | |
| 1040 | int (*show_options)(struct seq_file *, struct vfsmount *); |
| 1041 | |
| 1042 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
| 1043 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
| 1044 | }; |
| 1045 | |
| 1046 | /* Inode state bits. Protected by inode_lock. */ |
| 1047 | #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */ |
| 1048 | #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */ |
| 1049 | #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */ |
| 1050 | #define __I_LOCK 3 |
| 1051 | #define I_LOCK (1 << __I_LOCK) |
| 1052 | #define I_FREEING 16 |
| 1053 | #define I_CLEAR 32 |
| 1054 | #define I_NEW 64 |
Alexander Viro | 991114c | 2005-06-23 00:09:01 -0700 | [diff] [blame] | 1055 | #define I_WILL_FREE 128 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
| 1057 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
| 1058 | |
| 1059 | extern void __mark_inode_dirty(struct inode *, int); |
| 1060 | static inline void mark_inode_dirty(struct inode *inode) |
| 1061 | { |
| 1062 | __mark_inode_dirty(inode, I_DIRTY); |
| 1063 | } |
| 1064 | |
| 1065 | static inline void mark_inode_dirty_sync(struct inode *inode) |
| 1066 | { |
| 1067 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
| 1068 | } |
| 1069 | |
| 1070 | static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry) |
| 1071 | { |
| 1072 | /* per-mountpoint checks will go here */ |
| 1073 | update_atime(dentry->d_inode); |
| 1074 | } |
| 1075 | |
| 1076 | static inline void file_accessed(struct file *file) |
| 1077 | { |
| 1078 | if (!(file->f_flags & O_NOATIME)) |
| 1079 | touch_atime(file->f_vfsmnt, file->f_dentry); |
| 1080 | } |
| 1081 | |
| 1082 | int sync_inode(struct inode *inode, struct writeback_control *wbc); |
| 1083 | |
| 1084 | /** |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1085 | * struct export_operations - for nfsd to communicate with file systems |
| 1086 | * @decode_fh: decode a file handle fragment and return a &struct dentry |
| 1087 | * @encode_fh: encode a file handle fragment from a dentry |
| 1088 | * @get_name: find the name for a given inode in a given directory |
| 1089 | * @get_parent: find the parent of a given directory |
| 1090 | * @get_dentry: find a dentry for the inode given a file handle sub-fragment |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | * |
| 1092 | * Description: |
| 1093 | * The export_operations structure provides a means for nfsd to communicate |
| 1094 | * with a particular exported file system - particularly enabling nfsd and |
| 1095 | * the filesystem to co-operate when dealing with file handles. |
| 1096 | * |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1097 | * export_operations contains two basic operation for dealing with file |
| 1098 | * handles, decode_fh() and encode_fh(), and allows for some other |
| 1099 | * operations to be defined which standard helper routines use to get |
| 1100 | * specific information from the filesystem. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | * |
| 1102 | * nfsd encodes information use to determine which filesystem a filehandle |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1103 | * applies to in the initial part of the file handle. The remainder, termed |
| 1104 | * a file handle fragment, is controlled completely by the filesystem. The |
| 1105 | * standard helper routines assume that this fragment will contain one or |
| 1106 | * two sub-fragments, one which identifies the file, and one which may be |
| 1107 | * used to identify the (a) directory containing the file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | * |
| 1109 | * In some situations, nfsd needs to get a dentry which is connected into a |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1110 | * specific part of the file tree. To allow for this, it passes the |
| 1111 | * function acceptable() together with a @context which can be used to see |
| 1112 | * if the dentry is acceptable. As there can be multiple dentrys for a |
| 1113 | * given file, the filesystem should check each one for acceptability before |
| 1114 | * looking for the next. As soon as an acceptable one is found, it should |
| 1115 | * be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | * |
| 1117 | * decode_fh: |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1118 | * @decode_fh is given a &struct super_block (@sb), a file handle fragment |
| 1119 | * (@fh, @fh_len) and an acceptability testing function (@acceptable, |
| 1120 | * @context). It should return a &struct dentry which refers to the same |
| 1121 | * file that the file handle fragment refers to, and which passes the |
| 1122 | * acceptability test. If it cannot, it should return a %NULL pointer if |
| 1123 | * the file was found but no acceptable &dentries were available, or a |
| 1124 | * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or |
| 1125 | * %ENOMEM). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | * |
| 1127 | * encode_fh: |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1128 | * @encode_fh should store in the file handle fragment @fh (using at most |
| 1129 | * @max_len bytes) information that can be used by @decode_fh to recover the |
| 1130 | * file refered to by the &struct dentry @de. If the @connectable flag is |
| 1131 | * set, the encode_fh() should store sufficient information so that a good |
| 1132 | * attempt can be made to find not only the file but also it's place in the |
| 1133 | * filesystem. This typically means storing a reference to de->d_parent in |
| 1134 | * the filehandle fragment. encode_fh() should return the number of bytes |
| 1135 | * stored or a negative error code such as %-ENOSPC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | * |
| 1137 | * get_name: |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1138 | * @get_name should find a name for the given @child in the given @parent |
| 1139 | * directory. The name should be stored in the @name (with the |
| 1140 | * understanding that it is already pointing to a a %NAME_MAX+1 sized |
| 1141 | * buffer. get_name() should return %0 on success, a negative error code |
| 1142 | * or error. @get_name will be called without @parent->i_sem held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | * |
| 1144 | * get_parent: |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1145 | * @get_parent should find the parent directory for the given @child which |
| 1146 | * is also a directory. In the event that it cannot be found, or storage |
| 1147 | * space cannot be allocated, a %ERR_PTR should be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | * |
| 1149 | * get_dentry: |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1150 | * Given a &super_block (@sb) and a pointer to a file-system specific inode |
| 1151 | * identifier, possibly an inode number, (@inump) get_dentry() should find |
| 1152 | * the identified inode and return a dentry for that inode. Any suitable |
| 1153 | * dentry can be returned including, if necessary, a new dentry created with |
| 1154 | * d_alloc_root. The caller can then find any other extant dentrys by |
| 1155 | * following the d_alias links. If a new dentry was created using |
| 1156 | * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry |
| 1157 | * should be d_rehash()ed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | * |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1159 | * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code |
| 1160 | * can be returned. The @inump will be whatever was passed to |
| 1161 | * nfsd_find_fh_dentry() in either the @obj or @parent parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | * |
| 1163 | * Locking rules: |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 1164 | * get_parent is called with child->d_inode->i_sem down |
| 1165 | * get_name is not (which is possibly inconsistent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | */ |
| 1167 | |
| 1168 | struct export_operations { |
| 1169 | struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type, |
| 1170 | int (*acceptable)(void *context, struct dentry *de), |
| 1171 | void *context); |
| 1172 | int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, |
| 1173 | int connectable); |
| 1174 | |
| 1175 | /* the following are only called from the filesystem itself */ |
| 1176 | int (*get_name)(struct dentry *parent, char *name, |
| 1177 | struct dentry *child); |
| 1178 | struct dentry * (*get_parent)(struct dentry *child); |
| 1179 | struct dentry * (*get_dentry)(struct super_block *sb, void *inump); |
| 1180 | |
| 1181 | /* This is set by the exporting module to a standard helper */ |
| 1182 | struct dentry * (*find_exported_dentry)( |
| 1183 | struct super_block *sb, void *obj, void *parent, |
| 1184 | int (*acceptable)(void *context, struct dentry *de), |
| 1185 | void *context); |
| 1186 | |
| 1187 | |
| 1188 | }; |
| 1189 | |
| 1190 | extern struct dentry * |
| 1191 | find_exported_dentry(struct super_block *sb, void *obj, void *parent, |
| 1192 | int (*acceptable)(void *context, struct dentry *de), |
| 1193 | void *context); |
| 1194 | |
| 1195 | struct file_system_type { |
| 1196 | const char *name; |
| 1197 | int fs_flags; |
| 1198 | struct super_block *(*get_sb) (struct file_system_type *, int, |
| 1199 | const char *, void *); |
| 1200 | void (*kill_sb) (struct super_block *); |
| 1201 | struct module *owner; |
| 1202 | struct file_system_type * next; |
| 1203 | struct list_head fs_supers; |
| 1204 | }; |
| 1205 | |
| 1206 | struct super_block *get_sb_bdev(struct file_system_type *fs_type, |
| 1207 | int flags, const char *dev_name, void *data, |
| 1208 | int (*fill_super)(struct super_block *, void *, int)); |
| 1209 | struct super_block *get_sb_single(struct file_system_type *fs_type, |
| 1210 | int flags, void *data, |
| 1211 | int (*fill_super)(struct super_block *, void *, int)); |
| 1212 | struct super_block *get_sb_nodev(struct file_system_type *fs_type, |
| 1213 | int flags, void *data, |
| 1214 | int (*fill_super)(struct super_block *, void *, int)); |
| 1215 | void generic_shutdown_super(struct super_block *sb); |
| 1216 | void kill_block_super(struct super_block *sb); |
| 1217 | void kill_anon_super(struct super_block *sb); |
| 1218 | void kill_litter_super(struct super_block *sb); |
| 1219 | void deactivate_super(struct super_block *sb); |
| 1220 | int set_anon_super(struct super_block *s, void *data); |
| 1221 | struct super_block *sget(struct file_system_type *type, |
| 1222 | int (*test)(struct super_block *,void *), |
| 1223 | int (*set)(struct super_block *,void *), |
| 1224 | void *data); |
| 1225 | struct super_block *get_sb_pseudo(struct file_system_type *, char *, |
| 1226 | struct super_operations *ops, unsigned long); |
| 1227 | int __put_super(struct super_block *sb); |
| 1228 | int __put_super_and_need_restart(struct super_block *sb); |
| 1229 | void unnamed_dev_init(void); |
| 1230 | |
| 1231 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
| 1232 | #define fops_get(fops) \ |
| 1233 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
| 1234 | #define fops_put(fops) \ |
| 1235 | do { if (fops) module_put((fops)->owner); } while(0) |
| 1236 | |
| 1237 | extern int register_filesystem(struct file_system_type *); |
| 1238 | extern int unregister_filesystem(struct file_system_type *); |
| 1239 | extern struct vfsmount *kern_mount(struct file_system_type *); |
| 1240 | extern int may_umount_tree(struct vfsmount *); |
| 1241 | extern int may_umount(struct vfsmount *); |
| 1242 | extern long do_mount(char *, char *, char *, unsigned long, void *); |
| 1243 | |
| 1244 | extern int vfs_statfs(struct super_block *, struct kstatfs *); |
| 1245 | |
| 1246 | #define FLOCK_VERIFY_READ 1 |
| 1247 | #define FLOCK_VERIFY_WRITE 2 |
| 1248 | |
| 1249 | extern int locks_mandatory_locked(struct inode *); |
| 1250 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
| 1251 | |
| 1252 | /* |
| 1253 | * Candidates for mandatory locking have the setgid bit set |
| 1254 | * but no group execute bit - an otherwise meaningless combination. |
| 1255 | */ |
| 1256 | #define MANDATORY_LOCK(inode) \ |
| 1257 | (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) |
| 1258 | |
| 1259 | static inline int locks_verify_locked(struct inode *inode) |
| 1260 | { |
| 1261 | if (MANDATORY_LOCK(inode)) |
| 1262 | return locks_mandatory_locked(inode); |
| 1263 | return 0; |
| 1264 | } |
| 1265 | |
| 1266 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); |
| 1267 | |
| 1268 | static inline int locks_verify_truncate(struct inode *inode, |
| 1269 | struct file *filp, |
| 1270 | loff_t size) |
| 1271 | { |
| 1272 | if (inode->i_flock && MANDATORY_LOCK(inode)) |
| 1273 | return locks_mandatory_area( |
| 1274 | FLOCK_VERIFY_WRITE, inode, filp, |
| 1275 | size < inode->i_size ? size : inode->i_size, |
| 1276 | (size < inode->i_size ? inode->i_size - size |
| 1277 | : size - inode->i_size) |
| 1278 | ); |
| 1279 | return 0; |
| 1280 | } |
| 1281 | |
| 1282 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 1283 | { |
| 1284 | if (inode->i_flock) |
| 1285 | return __break_lease(inode, mode); |
| 1286 | return 0; |
| 1287 | } |
| 1288 | |
| 1289 | /* fs/open.c */ |
| 1290 | |
| 1291 | extern int do_truncate(struct dentry *, loff_t start); |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1292 | extern long do_sys_open(const char __user *filename, int flags, int mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | extern struct file *filp_open(const char *, int, int); |
| 1294 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int); |
| 1295 | extern int filp_close(struct file *, fl_owner_t id); |
| 1296 | extern char * getname(const char __user *); |
| 1297 | |
| 1298 | /* fs/dcache.c */ |
| 1299 | extern void __init vfs_caches_init_early(void); |
| 1300 | extern void __init vfs_caches_init(unsigned long); |
| 1301 | |
| 1302 | #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL) |
| 1303 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
| 1304 | #ifndef CONFIG_AUDITSYSCALL |
| 1305 | #define putname(name) __putname(name) |
| 1306 | #else |
| 1307 | extern void putname(const char *name); |
| 1308 | #endif |
| 1309 | |
| 1310 | extern int register_blkdev(unsigned int, const char *); |
| 1311 | extern int unregister_blkdev(unsigned int, const char *); |
| 1312 | extern struct block_device *bdget(dev_t); |
| 1313 | extern void bd_set_size(struct block_device *, loff_t size); |
| 1314 | extern void bd_forget(struct inode *inode); |
| 1315 | extern void bdput(struct block_device *); |
| 1316 | extern struct block_device *open_by_devnum(dev_t, unsigned); |
| 1317 | extern struct file_operations def_blk_fops; |
| 1318 | extern struct address_space_operations def_blk_aops; |
| 1319 | extern struct file_operations def_chr_fops; |
| 1320 | extern struct file_operations bad_sock_fops; |
| 1321 | extern struct file_operations def_fifo_fops; |
| 1322 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
| 1323 | extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long); |
| 1324 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
| 1325 | extern int blkdev_get(struct block_device *, mode_t, unsigned); |
| 1326 | extern int blkdev_put(struct block_device *); |
| 1327 | extern int bd_claim(struct block_device *, void *); |
| 1328 | extern void bd_release(struct block_device *); |
| 1329 | |
| 1330 | /* fs/char_dev.c */ |
| 1331 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
| 1332 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
| 1333 | extern int register_chrdev(unsigned int, const char *, |
| 1334 | struct file_operations *); |
| 1335 | extern int unregister_chrdev(unsigned int, const char *); |
| 1336 | extern void unregister_chrdev_region(dev_t, unsigned); |
| 1337 | extern int chrdev_open(struct inode *, struct file *); |
| 1338 | |
| 1339 | /* fs/block_dev.c */ |
| 1340 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
| 1341 | extern const char *__bdevname(dev_t, char *buffer); |
| 1342 | extern const char *bdevname(struct block_device *bdev, char *buffer); |
| 1343 | extern struct block_device *lookup_bdev(const char *); |
| 1344 | extern struct block_device *open_bdev_excl(const char *, int, void *); |
| 1345 | extern void close_bdev_excl(struct block_device *); |
| 1346 | |
| 1347 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
| 1348 | |
| 1349 | /* Invalid inode operations -- fs/bad_inode.c */ |
| 1350 | extern void make_bad_inode(struct inode *); |
| 1351 | extern int is_bad_inode(struct inode *); |
| 1352 | |
| 1353 | extern struct file_operations read_fifo_fops; |
| 1354 | extern struct file_operations write_fifo_fops; |
| 1355 | extern struct file_operations rdwr_fifo_fops; |
| 1356 | extern struct file_operations read_pipe_fops; |
| 1357 | extern struct file_operations write_pipe_fops; |
| 1358 | extern struct file_operations rdwr_pipe_fops; |
| 1359 | |
| 1360 | extern int fs_may_remount_ro(struct super_block *); |
| 1361 | |
| 1362 | /* |
| 1363 | * return READ, READA, or WRITE |
| 1364 | */ |
| 1365 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
| 1366 | |
| 1367 | /* |
| 1368 | * return data direction, READ or WRITE |
| 1369 | */ |
| 1370 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
| 1371 | |
| 1372 | extern int check_disk_change(struct block_device *); |
| 1373 | extern int invalidate_inodes(struct super_block *); |
Christoph Hellwig | 2ef4163 | 2005-05-05 16:15:59 -0700 | [diff] [blame] | 1374 | extern int __invalidate_device(struct block_device *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | extern int invalidate_partition(struct gendisk *, int); |
| 1376 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
| 1377 | pgoff_t start, pgoff_t end); |
| 1378 | unsigned long invalidate_inode_pages(struct address_space *mapping); |
| 1379 | static inline void invalidate_remote_inode(struct inode *inode) |
| 1380 | { |
| 1381 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 1382 | S_ISLNK(inode->i_mode)) |
| 1383 | invalidate_inode_pages(inode->i_mapping); |
| 1384 | } |
| 1385 | extern int invalidate_inode_pages2(struct address_space *mapping); |
| 1386 | extern int invalidate_inode_pages2_range(struct address_space *mapping, |
| 1387 | pgoff_t start, pgoff_t end); |
| 1388 | extern int write_inode_now(struct inode *, int); |
| 1389 | extern int filemap_fdatawrite(struct address_space *); |
| 1390 | extern int filemap_flush(struct address_space *); |
| 1391 | extern int filemap_fdatawait(struct address_space *); |
| 1392 | extern int filemap_write_and_wait(struct address_space *mapping); |
| 1393 | extern int filemap_write_and_wait_range(struct address_space *mapping, |
| 1394 | loff_t lstart, loff_t lend); |
| 1395 | extern void sync_supers(void); |
| 1396 | extern void sync_filesystems(int wait); |
| 1397 | extern void emergency_sync(void); |
| 1398 | extern void emergency_remount(void); |
| 1399 | extern int do_remount_sb(struct super_block *sb, int flags, |
| 1400 | void *data, int force); |
| 1401 | extern sector_t bmap(struct inode *, sector_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | extern int notify_change(struct dentry *, struct iattr *); |
| 1403 | extern int permission(struct inode *, int, struct nameidata *); |
| 1404 | extern int generic_permission(struct inode *, int, |
| 1405 | int (*check_acl)(struct inode *, int)); |
| 1406 | |
| 1407 | extern int get_write_access(struct inode *); |
| 1408 | extern int deny_write_access(struct file *); |
| 1409 | static inline void put_write_access(struct inode * inode) |
| 1410 | { |
| 1411 | atomic_dec(&inode->i_writecount); |
| 1412 | } |
| 1413 | static inline void allow_write_access(struct file *file) |
| 1414 | { |
| 1415 | if (file) |
| 1416 | atomic_inc(&file->f_dentry->d_inode->i_writecount); |
| 1417 | } |
| 1418 | extern int do_pipe(int *); |
| 1419 | |
| 1420 | extern int open_namei(const char *, int, int, struct nameidata *); |
| 1421 | extern int may_open(struct nameidata *, int, int); |
| 1422 | |
| 1423 | extern int kernel_read(struct file *, unsigned long, char *, unsigned long); |
| 1424 | extern struct file * open_exec(const char *); |
| 1425 | |
| 1426 | /* fs/dcache.c -- generic fs support functions */ |
| 1427 | extern int is_subdir(struct dentry *, struct dentry *); |
| 1428 | extern ino_t find_inode_number(struct dentry *, struct qstr *); |
| 1429 | |
| 1430 | #include <linux/err.h> |
| 1431 | |
| 1432 | /* needed for stackable file system support */ |
| 1433 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); |
| 1434 | |
| 1435 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); |
| 1436 | |
| 1437 | extern void inode_init_once(struct inode *); |
| 1438 | extern void iput(struct inode *); |
| 1439 | extern struct inode * igrab(struct inode *); |
| 1440 | extern ino_t iunique(struct super_block *, ino_t); |
| 1441 | extern int inode_needs_sync(struct inode *inode); |
| 1442 | extern void generic_delete_inode(struct inode *inode); |
Mark Fasheh | cb2c023 | 2005-07-07 17:56:03 -0700 | [diff] [blame] | 1443 | extern void generic_drop_inode(struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1445 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
| 1446 | unsigned long hashval, int (*test)(struct inode *, void *), |
| 1447 | void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
| 1449 | int (*test)(struct inode *, void *), void *data); |
| 1450 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
| 1451 | |
| 1452 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
| 1453 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
| 1454 | extern void unlock_new_inode(struct inode *); |
| 1455 | |
| 1456 | static inline struct inode *iget(struct super_block *sb, unsigned long ino) |
| 1457 | { |
| 1458 | struct inode *inode = iget_locked(sb, ino); |
| 1459 | |
| 1460 | if (inode && (inode->i_state & I_NEW)) { |
| 1461 | sb->s_op->read_inode(inode); |
| 1462 | unlock_new_inode(inode); |
| 1463 | } |
| 1464 | |
| 1465 | return inode; |
| 1466 | } |
| 1467 | |
| 1468 | extern void __iget(struct inode * inode); |
| 1469 | extern void clear_inode(struct inode *); |
| 1470 | extern void destroy_inode(struct inode *); |
| 1471 | extern struct inode *new_inode(struct super_block *); |
| 1472 | extern int remove_suid(struct dentry *); |
| 1473 | extern void remove_dquot_ref(struct super_block *, int, struct list_head *); |
| 1474 | extern struct semaphore iprune_sem; |
| 1475 | |
| 1476 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
| 1477 | extern void remove_inode_hash(struct inode *); |
| 1478 | static inline void insert_inode_hash(struct inode *inode) { |
| 1479 | __insert_inode_hash(inode, inode->i_ino); |
| 1480 | } |
| 1481 | |
| 1482 | extern struct file * get_empty_filp(void); |
| 1483 | extern void file_move(struct file *f, struct list_head *list); |
| 1484 | extern void file_kill(struct file *f); |
| 1485 | struct bio; |
| 1486 | extern void submit_bio(int, struct bio *); |
| 1487 | extern int bdev_read_only(struct block_device *); |
| 1488 | extern int set_blocksize(struct block_device *, int); |
| 1489 | extern int sb_set_blocksize(struct super_block *, int); |
| 1490 | extern int sb_min_blocksize(struct super_block *, int); |
| 1491 | |
| 1492 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
| 1493 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
| 1494 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); |
| 1495 | extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); |
| 1496 | extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *); |
| 1497 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
| 1498 | extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *); |
| 1499 | extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t); |
| 1500 | extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *); |
| 1501 | extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t); |
| 1502 | extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, |
| 1503 | unsigned long, loff_t *); |
| 1504 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
| 1505 | unsigned long *, loff_t, loff_t *, size_t, size_t); |
| 1506 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, |
| 1507 | unsigned long, loff_t, loff_t *, size_t, ssize_t); |
| 1508 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); |
| 1509 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); |
| 1510 | ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov, |
| 1511 | unsigned long nr_segs, loff_t *ppos); |
| 1512 | extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); |
| 1513 | extern void do_generic_mapping_read(struct address_space *mapping, |
| 1514 | struct file_ra_state *, struct file *, |
| 1515 | loff_t *, read_descriptor_t *, read_actor_t); |
| 1516 | extern void |
| 1517 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, |
| 1519 | unsigned long nr_segs, loff_t *ppos); |
| 1520 | ssize_t generic_file_writev(struct file *filp, const struct iovec *iov, |
| 1521 | unsigned long nr_segs, loff_t *ppos); |
| 1522 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
| 1523 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); |
| 1524 | extern loff_t remote_llseek(struct file *file, loff_t offset, int origin); |
| 1525 | extern int generic_file_open(struct inode * inode, struct file * filp); |
| 1526 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
| 1527 | |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 1528 | #ifdef CONFIG_FS_XIP |
Carsten Otte | eb6fe0c | 2005-06-23 22:05:28 -0700 | [diff] [blame] | 1529 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
| 1530 | loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 1531 | extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos, |
| 1532 | size_t count, read_actor_t actor, |
| 1533 | void *target); |
| 1534 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
Carsten Otte | eb6fe0c | 2005-06-23 22:05:28 -0700 | [diff] [blame] | 1535 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
| 1536 | size_t len, loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 1537 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 1538 | #else |
| 1539 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
| 1540 | { |
| 1541 | return 0; |
| 1542 | } |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 1543 | #endif |
| 1544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | static inline void do_generic_file_read(struct file * filp, loff_t *ppos, |
| 1546 | read_descriptor_t * desc, |
| 1547 | read_actor_t actor) |
| 1548 | { |
| 1549 | do_generic_mapping_read(filp->f_mapping, |
| 1550 | &filp->f_ra, |
| 1551 | filp, |
| 1552 | ppos, |
| 1553 | desc, |
| 1554 | actor); |
| 1555 | } |
| 1556 | |
| 1557 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
| 1558 | struct block_device *bdev, const struct iovec *iov, loff_t offset, |
| 1559 | unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io, |
| 1560 | int lock_type); |
| 1561 | |
| 1562 | enum { |
| 1563 | DIO_LOCKING = 1, /* need locking between buffered and direct access */ |
| 1564 | DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ |
| 1565 | DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ |
| 1566 | }; |
| 1567 | |
| 1568 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
| 1569 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
| 1570 | loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, |
| 1571 | dio_iodone_t end_io) |
| 1572 | { |
| 1573 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
| 1574 | nr_segs, get_blocks, end_io, DIO_LOCKING); |
| 1575 | } |
| 1576 | |
| 1577 | static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, |
| 1578 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
| 1579 | loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, |
| 1580 | dio_iodone_t end_io) |
| 1581 | { |
| 1582 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
| 1583 | nr_segs, get_blocks, end_io, DIO_NO_LOCKING); |
| 1584 | } |
| 1585 | |
| 1586 | static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, |
| 1587 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
| 1588 | loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, |
| 1589 | dio_iodone_t end_io) |
| 1590 | { |
| 1591 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
| 1592 | nr_segs, get_blocks, end_io, DIO_OWN_LOCKING); |
| 1593 | } |
| 1594 | |
| 1595 | extern struct file_operations generic_ro_fops; |
| 1596 | |
| 1597 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
| 1598 | |
| 1599 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); |
| 1600 | extern int vfs_follow_link(struct nameidata *, const char *); |
| 1601 | extern int page_readlink(struct dentry *, char __user *, int); |
Linus Torvalds | cc314ee | 2005-08-19 18:02:56 -0700 | [diff] [blame] | 1602 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
| 1603 | extern void page_put_link(struct dentry *, struct nameidata *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
| 1605 | extern struct inode_operations page_symlink_inode_operations; |
| 1606 | extern int generic_readlink(struct dentry *, char __user *, int); |
| 1607 | extern void generic_fillattr(struct inode *, struct kstat *); |
| 1608 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| 1609 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
| 1610 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
| 1611 | loff_t inode_get_bytes(struct inode *inode); |
| 1612 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
| 1613 | |
| 1614 | extern int vfs_readdir(struct file *, filldir_t, void *); |
| 1615 | |
| 1616 | extern int vfs_stat(char __user *, struct kstat *); |
| 1617 | extern int vfs_lstat(char __user *, struct kstat *); |
| 1618 | extern int vfs_fstat(unsigned int, struct kstat *); |
| 1619 | |
| 1620 | extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); |
| 1621 | |
| 1622 | extern struct file_system_type *get_fs_type(const char *name); |
| 1623 | extern struct super_block *get_super(struct block_device *); |
| 1624 | extern struct super_block *user_get_super(dev_t); |
| 1625 | extern void drop_super(struct super_block *sb); |
| 1626 | |
| 1627 | extern int dcache_dir_open(struct inode *, struct file *); |
| 1628 | extern int dcache_dir_close(struct inode *, struct file *); |
| 1629 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
| 1630 | extern int dcache_readdir(struct file *, void *, filldir_t); |
| 1631 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| 1632 | extern int simple_statfs(struct super_block *, struct kstatfs *); |
| 1633 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
| 1634 | extern int simple_unlink(struct inode *, struct dentry *); |
| 1635 | extern int simple_rmdir(struct inode *, struct dentry *); |
| 1636 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
| 1637 | extern int simple_sync_file(struct file *, struct dentry *, int); |
| 1638 | extern int simple_empty(struct dentry *); |
| 1639 | extern int simple_readpage(struct file *file, struct page *page); |
| 1640 | extern int simple_prepare_write(struct file *file, struct page *page, |
| 1641 | unsigned offset, unsigned to); |
| 1642 | extern int simple_commit_write(struct file *file, struct page *page, |
| 1643 | unsigned offset, unsigned to); |
| 1644 | |
| 1645 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); |
| 1646 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
| 1647 | extern struct file_operations simple_dir_operations; |
| 1648 | extern struct inode_operations simple_dir_inode_operations; |
| 1649 | struct tree_descr { char *name; struct file_operations *ops; int mode; }; |
| 1650 | struct dentry *d_alloc_name(struct dentry *, const char *); |
| 1651 | extern int simple_fill_super(struct super_block *, int, struct tree_descr *); |
| 1652 | extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count); |
| 1653 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
| 1654 | |
| 1655 | extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t); |
| 1656 | |
| 1657 | extern int inode_change_ok(struct inode *, struct iattr *); |
| 1658 | extern int __must_check inode_setattr(struct inode *, struct iattr *); |
| 1659 | |
| 1660 | extern void inode_update_time(struct inode *inode, int ctime_too); |
| 1661 | |
| 1662 | static inline ino_t parent_ino(struct dentry *dentry) |
| 1663 | { |
| 1664 | ino_t res; |
| 1665 | |
| 1666 | spin_lock(&dentry->d_lock); |
| 1667 | res = dentry->d_parent->d_inode->i_ino; |
| 1668 | spin_unlock(&dentry->d_lock); |
| 1669 | return res; |
| 1670 | } |
| 1671 | |
| 1672 | /* kernel/fork.c */ |
| 1673 | extern int unshare_files(void); |
| 1674 | |
| 1675 | /* Transaction based IO helpers */ |
| 1676 | |
| 1677 | /* |
| 1678 | * An argresp is stored in an allocated page and holds the |
| 1679 | * size of the argument or response, along with its content |
| 1680 | */ |
| 1681 | struct simple_transaction_argresp { |
| 1682 | ssize_t size; |
| 1683 | char data[0]; |
| 1684 | }; |
| 1685 | |
| 1686 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
| 1687 | |
| 1688 | char *simple_transaction_get(struct file *file, const char __user *buf, |
| 1689 | size_t size); |
| 1690 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
| 1691 | size_t size, loff_t *pos); |
| 1692 | int simple_transaction_release(struct inode *inode, struct file *file); |
| 1693 | |
| 1694 | static inline void simple_transaction_set(struct file *file, size_t n) |
| 1695 | { |
| 1696 | struct simple_transaction_argresp *ar = file->private_data; |
| 1697 | |
| 1698 | BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); |
| 1699 | |
| 1700 | /* |
| 1701 | * The barrier ensures that ar->size will really remain zero until |
| 1702 | * ar->data is ready for reading. |
| 1703 | */ |
| 1704 | smp_mb(); |
| 1705 | ar->size = n; |
| 1706 | } |
| 1707 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 1708 | /* |
| 1709 | * simple attribute files |
| 1710 | * |
| 1711 | * These attributes behave similar to those in sysfs: |
| 1712 | * |
| 1713 | * Writing to an attribute immediately sets a value, an open file can be |
| 1714 | * written to multiple times. |
| 1715 | * |
| 1716 | * Reading from an attribute creates a buffer from the value that might get |
| 1717 | * read with multiple read calls. When the attribute has been read |
| 1718 | * completely, no further read calls are possible until the file is opened |
| 1719 | * again. |
| 1720 | * |
| 1721 | * All attributes contain a text representation of a numeric value |
| 1722 | * that are accessed with the get() and set() functions. |
| 1723 | */ |
| 1724 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| 1725 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
| 1726 | { \ |
| 1727 | __simple_attr_check_format(__fmt, 0ull); \ |
| 1728 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| 1729 | } \ |
| 1730 | static struct file_operations __fops = { \ |
| 1731 | .owner = THIS_MODULE, \ |
| 1732 | .open = __fops ## _open, \ |
| 1733 | .release = simple_attr_close, \ |
| 1734 | .read = simple_attr_read, \ |
| 1735 | .write = simple_attr_write, \ |
| 1736 | }; |
| 1737 | |
| 1738 | static inline void __attribute__((format(printf, 1, 2))) |
| 1739 | __simple_attr_check_format(const char *fmt, ...) |
| 1740 | { |
| 1741 | /* don't do anything, just let the compiler check the arguments; */ |
| 1742 | } |
| 1743 | |
| 1744 | int simple_attr_open(struct inode *inode, struct file *file, |
| 1745 | u64 (*get)(void *), void (*set)(void *, u64), |
| 1746 | const char *fmt); |
| 1747 | int simple_attr_close(struct inode *inode, struct file *file); |
| 1748 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
| 1749 | size_t len, loff_t *ppos); |
| 1750 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| 1751 | size_t len, loff_t *ppos); |
| 1752 | |
| 1753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | #ifdef CONFIG_SECURITY |
| 1755 | static inline char *alloc_secdata(void) |
| 1756 | { |
| 1757 | return (char *)get_zeroed_page(GFP_KERNEL); |
| 1758 | } |
| 1759 | |
| 1760 | static inline void free_secdata(void *secdata) |
| 1761 | { |
| 1762 | free_page((unsigned long)secdata); |
| 1763 | } |
| 1764 | #else |
| 1765 | static inline char *alloc_secdata(void) |
| 1766 | { |
| 1767 | return (char *)1; |
| 1768 | } |
| 1769 | |
| 1770 | static inline void free_secdata(void *secdata) |
| 1771 | { } |
| 1772 | #endif /* CONFIG_SECURITY */ |
| 1773 | |
| 1774 | #endif /* __KERNEL__ */ |
| 1775 | #endif /* _LINUX_FS_H */ |