fs.h 72 KB

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  1. #ifndef _LINUX_FS_H
  2. #define _LINUX_FS_H
  3. /*
  4. * This file has definitions for some important file table
  5. * structures etc.
  6. */
  7. #include <linux/limits.h>
  8. #include <linux/ioctl.h>
  9. /*
  10. * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
  11. * the file limit at runtime and only root can increase the per-process
  12. * nr_file rlimit, so it's safe to set up a ridiculously high absolute
  13. * upper limit on files-per-process.
  14. *
  15. * Some programs (notably those using select()) may have to be
  16. * recompiled to take full advantage of the new limits..
  17. */
  18. /* Fixed constants first: */
  19. #undef NR_OPEN
  20. #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
  21. #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
  22. #define BLOCK_SIZE_BITS 10
  23. #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
  24. #define SEEK_SET 0 /* seek relative to beginning of file */
  25. #define SEEK_CUR 1 /* seek relative to current file position */
  26. #define SEEK_END 2 /* seek relative to end of file */
  27. /* And dynamically-tunable limits and defaults: */
  28. struct files_stat_struct {
  29. int nr_files; /* read only */
  30. int nr_free_files; /* read only */
  31. int max_files; /* tunable */
  32. };
  33. extern struct files_stat_struct files_stat;
  34. extern int get_max_files(void);
  35. struct inodes_stat_t {
  36. int nr_inodes;
  37. int nr_unused;
  38. int dummy[5];
  39. };
  40. extern struct inodes_stat_t inodes_stat;
  41. extern int leases_enable, lease_break_time;
  42. #ifdef CONFIG_DNOTIFY
  43. extern int dir_notify_enable;
  44. #endif
  45. #define NR_FILE 8192 /* this can well be larger on a larger system */
  46. #define MAY_EXEC 1
  47. #define MAY_WRITE 2
  48. #define MAY_READ 4
  49. #define MAY_APPEND 8
  50. #define FMODE_READ 1
  51. #define FMODE_WRITE 2
  52. /* Internal kernel extensions */
  53. #define FMODE_LSEEK 4
  54. #define FMODE_PREAD 8
  55. #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
  56. /* File is being opened for execution. Primary users of this flag are
  57. distributed filesystems that can use it to achieve correct ETXTBUSY
  58. behavior for cross-node execution/opening_for_writing of files */
  59. #define FMODE_EXEC 16
  60. #define RW_MASK 1
  61. #define RWA_MASK 2
  62. #define READ 0
  63. #define WRITE 1
  64. #define READA 2 /* read-ahead - don't block if no resources */
  65. #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
  66. #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
  67. #define READ_META (READ | (1 << BIO_RW_META))
  68. #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
  69. #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
  70. #define SEL_IN 1
  71. #define SEL_OUT 2
  72. #define SEL_EX 4
  73. /* public flags for file_system_type */
  74. #define FS_REQUIRES_DEV 1
  75. #define FS_BINARY_MOUNTDATA 2
  76. #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
  77. #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
  78. * during rename() internally.
  79. */
  80. /*
  81. * These are the fs-independent mount-flags: up to 32 flags are supported
  82. */
  83. #define MS_RDONLY 1 /* Mount read-only */
  84. #define MS_NOSUID 2 /* Ignore suid and sgid bits */
  85. #define MS_NODEV 4 /* Disallow access to device special files */
  86. #define MS_NOEXEC 8 /* Disallow program execution */
  87. #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
  88. #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
  89. #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
  90. #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
  91. #define MS_NOATIME 1024 /* Do not update access times. */
  92. #define MS_NODIRATIME 2048 /* Do not update directory access times */
  93. #define MS_BIND 4096
  94. #define MS_MOVE 8192
  95. #define MS_REC 16384
  96. #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
  97. MS_VERBOSE is deprecated. */
  98. #define MS_SILENT 32768
  99. #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
  100. #define MS_UNBINDABLE (1<<17) /* change to unbindable */
  101. #define MS_PRIVATE (1<<18) /* change to private */
  102. #define MS_SLAVE (1<<19) /* change to slave */
  103. #define MS_SHARED (1<<20) /* change to shared */
  104. #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
  105. #define MS_ACTIVE (1<<30)
  106. #define MS_NOUSER (1<<31)
  107. /*
  108. * Superblock flags that can be altered by MS_REMOUNT
  109. */
  110. #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
  111. /*
  112. * Old magic mount flag and mask
  113. */
  114. #define MS_MGC_VAL 0xC0ED0000
  115. #define MS_MGC_MSK 0xffff0000
  116. /* Inode flags - they have nothing to superblock flags now */
  117. #define S_SYNC 1 /* Writes are synced at once */
  118. #define S_NOATIME 2 /* Do not update access times */
  119. #define S_APPEND 4 /* Append-only file */
  120. #define S_IMMUTABLE 8 /* Immutable file */
  121. #define S_DEAD 16 /* removed, but still open directory */
  122. #define S_NOQUOTA 32 /* Inode is not counted to quota */
  123. #define S_DIRSYNC 64 /* Directory modifications are synchronous */
  124. #define S_NOCMTIME 128 /* Do not update file c/mtime */
  125. #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
  126. #define S_PRIVATE 512 /* Inode is fs-internal */
  127. /*
  128. * Note that nosuid etc flags are inode-specific: setting some file-system
  129. * flags just means all the inodes inherit those flags by default. It might be
  130. * possible to override it selectively if you really wanted to with some
  131. * ioctl() that is not currently implemented.
  132. *
  133. * Exception: MS_RDONLY is always applied to the entire file system.
  134. *
  135. * Unfortunately, it is possible to change a filesystems flags with it mounted
  136. * with files in use. This means that all of the inodes will not have their
  137. * i_flags updated. Hence, i_flags no longer inherit the superblock mount
  138. * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
  139. */
  140. #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
  141. #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
  142. #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
  143. ((inode)->i_flags & S_SYNC))
  144. #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
  145. ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
  146. #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
  147. #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
  148. #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
  149. #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
  150. #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
  151. #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
  152. #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
  153. #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
  154. #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
  155. #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
  156. /* the read-only stuff doesn't really belong here, but any other place is
  157. probably as bad and I don't want to create yet another include file. */
  158. #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
  159. #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
  160. #define BLKRRPART _IO(0x12,95) /* re-read partition table */
  161. #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
  162. #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
  163. #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
  164. #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
  165. #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
  166. #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
  167. #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
  168. #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
  169. #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
  170. #if 0
  171. #define BLKPG _IO(0x12,105)/* See blkpg.h */
  172. /* Some people are morons. Do not use sizeof! */
  173. #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
  174. #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
  175. /* This was here just to show that the number is taken -
  176. probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
  177. #endif
  178. /* A jump here: 108-111 have been used for various private purposes. */
  179. #define BLKBSZGET _IOR(0x12,112,size_t)
  180. #define BLKBSZSET _IOW(0x12,113,size_t)
  181. #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  182. #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
  183. #define BLKTRACESTART _IO(0x12,116)
  184. #define BLKTRACESTOP _IO(0x12,117)
  185. #define BLKTRACETEARDOWN _IO(0x12,118)
  186. #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
  187. #define FIBMAP _IO(0x00,1) /* bmap access */
  188. #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
  189. #define FS_IOC_GETFLAGS _IOR('f', 1, long)
  190. #define FS_IOC_SETFLAGS _IOW('f', 2, long)
  191. #define FS_IOC_GETVERSION _IOR('v', 1, long)
  192. #define FS_IOC_SETVERSION _IOW('v', 2, long)
  193. #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
  194. #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
  195. #define FS_IOC32_GETVERSION _IOR('v', 1, int)
  196. #define FS_IOC32_SETVERSION _IOW('v', 2, int)
  197. /*
  198. * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
  199. */
  200. #define FS_SECRM_FL 0x00000001 /* Secure deletion */
  201. #define FS_UNRM_FL 0x00000002 /* Undelete */
  202. #define FS_COMPR_FL 0x00000004 /* Compress file */
  203. #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
  204. #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
  205. #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
  206. #define FS_NODUMP_FL 0x00000040 /* do not dump file */
  207. #define FS_NOATIME_FL 0x00000080 /* do not update atime */
  208. /* Reserved for compression usage... */
  209. #define FS_DIRTY_FL 0x00000100
  210. #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
  211. #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
  212. #define FS_ECOMPR_FL 0x00000800 /* Compression error */
  213. /* End compression flags --- maybe not all used */
  214. #define FS_BTREE_FL 0x00001000 /* btree format dir */
  215. #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
  216. #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
  217. #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
  218. #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
  219. #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
  220. #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
  221. #define FS_EXTENT_FL 0x00080000 /* Extents */
  222. #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
  223. #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
  224. #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
  225. #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
  226. #define SYNC_FILE_RANGE_WAIT_BEFORE 1
  227. #define SYNC_FILE_RANGE_WRITE 2
  228. #define SYNC_FILE_RANGE_WAIT_AFTER 4
  229. #ifdef __KERNEL__
  230. #include <linux/linkage.h>
  231. #include <linux/wait.h>
  232. #include <linux/types.h>
  233. #include <linux/kdev_t.h>
  234. #include <linux/dcache.h>
  235. #include <linux/namei.h>
  236. #include <linux/stat.h>
  237. #include <linux/cache.h>
  238. #include <linux/kobject.h>
  239. #include <linux/list.h>
  240. #include <linux/radix-tree.h>
  241. #include <linux/prio_tree.h>
  242. #include <linux/init.h>
  243. #include <linux/pid.h>
  244. #include <linux/mutex.h>
  245. #include <asm/atomic.h>
  246. #include <asm/semaphore.h>
  247. #include <asm/byteorder.h>
  248. struct hd_geometry;
  249. struct iovec;
  250. struct nameidata;
  251. struct kiocb;
  252. struct pipe_inode_info;
  253. struct poll_table_struct;
  254. struct kstatfs;
  255. struct vm_area_struct;
  256. struct vfsmount;
  257. extern void __init inode_init(unsigned long);
  258. extern void __init inode_init_early(void);
  259. extern void __init mnt_init(unsigned long);
  260. extern void __init files_init(unsigned long);
  261. struct buffer_head;
  262. typedef int (get_block_t)(struct inode *inode, sector_t iblock,
  263. struct buffer_head *bh_result, int create);
  264. typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
  265. ssize_t bytes, void *private);
  266. /*
  267. * Attribute flags. These should be or-ed together to figure out what
  268. * has been changed!
  269. */
  270. #define ATTR_MODE 1
  271. #define ATTR_UID 2
  272. #define ATTR_GID 4
  273. #define ATTR_SIZE 8
  274. #define ATTR_ATIME 16
  275. #define ATTR_MTIME 32
  276. #define ATTR_CTIME 64
  277. #define ATTR_ATIME_SET 128
  278. #define ATTR_MTIME_SET 256
  279. #define ATTR_FORCE 512 /* Not a change, but a change it */
  280. #define ATTR_ATTR_FLAG 1024
  281. #define ATTR_KILL_SUID 2048
  282. #define ATTR_KILL_SGID 4096
  283. #define ATTR_FILE 8192
  284. /*
  285. * This is the Inode Attributes structure, used for notify_change(). It
  286. * uses the above definitions as flags, to know which values have changed.
  287. * Also, in this manner, a Filesystem can look at only the values it cares
  288. * about. Basically, these are the attributes that the VFS layer can
  289. * request to change from the FS layer.
  290. *
  291. * Derek Atkins <warlord@MIT.EDU> 94-10-20
  292. */
  293. struct iattr {
  294. unsigned int ia_valid;
  295. umode_t ia_mode;
  296. uid_t ia_uid;
  297. gid_t ia_gid;
  298. loff_t ia_size;
  299. struct timespec ia_atime;
  300. struct timespec ia_mtime;
  301. struct timespec ia_ctime;
  302. /*
  303. * Not an attribute, but an auxilary info for filesystems wanting to
  304. * implement an ftruncate() like method. NOTE: filesystem should
  305. * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
  306. */
  307. struct file *ia_file;
  308. };
  309. /*
  310. * Includes for diskquotas.
  311. */
  312. #include <linux/quota.h>
  313. /**
  314. * enum positive_aop_returns - aop return codes with specific semantics
  315. *
  316. * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
  317. * completed, that the page is still locked, and
  318. * should be considered active. The VM uses this hint
  319. * to return the page to the active list -- it won't
  320. * be a candidate for writeback again in the near
  321. * future. Other callers must be careful to unlock
  322. * the page if they get this return. Returned by
  323. * writepage();
  324. *
  325. * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
  326. * unlocked it and the page might have been truncated.
  327. * The caller should back up to acquiring a new page and
  328. * trying again. The aop will be taking reasonable
  329. * precautions not to livelock. If the caller held a page
  330. * reference, it should drop it before retrying. Returned
  331. * by readpage(), prepare_write(), and commit_write().
  332. *
  333. * address_space_operation functions return these large constants to indicate
  334. * special semantics to the caller. These are much larger than the bytes in a
  335. * page to allow for functions that return the number of bytes operated on in a
  336. * given page.
  337. */
  338. enum positive_aop_returns {
  339. AOP_WRITEPAGE_ACTIVATE = 0x80000,
  340. AOP_TRUNCATED_PAGE = 0x80001,
  341. };
  342. /*
  343. * oh the beauties of C type declarations.
  344. */
  345. struct page;
  346. struct address_space;
  347. struct writeback_control;
  348. struct address_space_operations {
  349. int (*writepage)(struct page *page, struct writeback_control *wbc);
  350. int (*readpage)(struct file *, struct page *);
  351. void (*sync_page)(struct page *);
  352. /* Write back some dirty pages from this mapping. */
  353. int (*writepages)(struct address_space *, struct writeback_control *);
  354. /* Set a page dirty. Return true if this dirtied it */
  355. int (*set_page_dirty)(struct page *page);
  356. int (*readpages)(struct file *filp, struct address_space *mapping,
  357. struct list_head *pages, unsigned nr_pages);
  358. /*
  359. * ext3 requires that a successful prepare_write() call be followed
  360. * by a commit_write() call - they must be balanced
  361. */
  362. int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
  363. int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
  364. /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
  365. sector_t (*bmap)(struct address_space *, sector_t);
  366. void (*invalidatepage) (struct page *, unsigned long);
  367. int (*releasepage) (struct page *, gfp_t);
  368. ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
  369. loff_t offset, unsigned long nr_segs);
  370. struct page* (*get_xip_page)(struct address_space *, sector_t,
  371. int);
  372. /* migrate the contents of a page to the specified target */
  373. int (*migratepage) (struct address_space *,
  374. struct page *, struct page *);
  375. int (*launder_page) (struct page *);
  376. };
  377. struct backing_dev_info;
  378. struct address_space {
  379. struct inode *host; /* owner: inode, block_device */
  380. struct radix_tree_root page_tree; /* radix tree of all pages */
  381. rwlock_t tree_lock; /* and rwlock protecting it */
  382. unsigned int i_mmap_writable;/* count VM_SHARED mappings */
  383. struct prio_tree_root i_mmap; /* tree of private and shared mappings */
  384. struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
  385. spinlock_t i_mmap_lock; /* protect tree, count, list */
  386. unsigned int truncate_count; /* Cover race condition with truncate */
  387. unsigned long nrpages; /* number of total pages */
  388. pgoff_t writeback_index;/* writeback starts here */
  389. const struct address_space_operations *a_ops; /* methods */
  390. unsigned long flags; /* error bits/gfp mask */
  391. struct backing_dev_info *backing_dev_info; /* device readahead, etc */
  392. spinlock_t private_lock; /* for use by the address_space */
  393. struct list_head private_list; /* ditto */
  394. struct address_space *assoc_mapping; /* ditto */
  395. } __attribute__((aligned(sizeof(long))));
  396. /*
  397. * On most architectures that alignment is already the case; but
  398. * must be enforced here for CRIS, to let the least signficant bit
  399. * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
  400. */
  401. struct block_device {
  402. dev_t bd_dev; /* not a kdev_t - it's a search key */
  403. struct inode * bd_inode; /* will die */
  404. int bd_openers;
  405. struct mutex bd_mutex; /* open/close mutex */
  406. struct semaphore bd_mount_sem;
  407. struct list_head bd_inodes;
  408. void * bd_holder;
  409. int bd_holders;
  410. #ifdef CONFIG_SYSFS
  411. struct list_head bd_holder_list;
  412. #endif
  413. struct block_device * bd_contains;
  414. unsigned bd_block_size;
  415. struct hd_struct * bd_part;
  416. /* number of times partitions within this device have been opened. */
  417. unsigned bd_part_count;
  418. int bd_invalidated;
  419. struct gendisk * bd_disk;
  420. struct list_head bd_list;
  421. struct backing_dev_info *bd_inode_backing_dev_info;
  422. /*
  423. * Private data. You must have bd_claim'ed the block_device
  424. * to use this. NOTE: bd_claim allows an owner to claim
  425. * the same device multiple times, the owner must take special
  426. * care to not mess up bd_private for that case.
  427. */
  428. unsigned long bd_private;
  429. };
  430. /*
  431. * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
  432. * radix trees
  433. */
  434. #define PAGECACHE_TAG_DIRTY 0
  435. #define PAGECACHE_TAG_WRITEBACK 1
  436. int mapping_tagged(struct address_space *mapping, int tag);
  437. /*
  438. * Might pages of this file be mapped into userspace?
  439. */
  440. static inline int mapping_mapped(struct address_space *mapping)
  441. {
  442. return !prio_tree_empty(&mapping->i_mmap) ||
  443. !list_empty(&mapping->i_mmap_nonlinear);
  444. }
  445. /*
  446. * Might pages of this file have been modified in userspace?
  447. * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
  448. * marks vma as VM_SHARED if it is shared, and the file was opened for
  449. * writing i.e. vma may be mprotected writable even if now readonly.
  450. */
  451. static inline int mapping_writably_mapped(struct address_space *mapping)
  452. {
  453. return mapping->i_mmap_writable != 0;
  454. }
  455. /*
  456. * Use sequence counter to get consistent i_size on 32-bit processors.
  457. */
  458. #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
  459. #include <linux/seqlock.h>
  460. #define __NEED_I_SIZE_ORDERED
  461. #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
  462. #else
  463. #define i_size_ordered_init(inode) do { } while (0)
  464. #endif
  465. struct inode {
  466. struct hlist_node i_hash;
  467. struct list_head i_list;
  468. struct list_head i_sb_list;
  469. struct list_head i_dentry;
  470. unsigned long i_ino;
  471. atomic_t i_count;
  472. unsigned int i_nlink;
  473. uid_t i_uid;
  474. gid_t i_gid;
  475. dev_t i_rdev;
  476. unsigned long i_version;
  477. loff_t i_size;
  478. #ifdef __NEED_I_SIZE_ORDERED
  479. seqcount_t i_size_seqcount;
  480. #endif
  481. struct timespec i_atime;
  482. struct timespec i_mtime;
  483. struct timespec i_ctime;
  484. unsigned int i_blkbits;
  485. blkcnt_t i_blocks;
  486. unsigned short i_bytes;
  487. umode_t i_mode;
  488. spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
  489. struct mutex i_mutex;
  490. struct rw_semaphore i_alloc_sem;
  491. const struct inode_operations *i_op;
  492. const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
  493. struct super_block *i_sb;
  494. struct file_lock *i_flock;
  495. struct address_space *i_mapping;
  496. struct address_space i_data;
  497. #ifdef CONFIG_QUOTA
  498. struct dquot *i_dquot[MAXQUOTAS];
  499. #endif
  500. struct list_head i_devices;
  501. union {
  502. struct pipe_inode_info *i_pipe;
  503. struct block_device *i_bdev;
  504. struct cdev *i_cdev;
  505. };
  506. int i_cindex;
  507. __u32 i_generation;
  508. #ifdef CONFIG_DNOTIFY
  509. unsigned long i_dnotify_mask; /* Directory notify events */
  510. struct dnotify_struct *i_dnotify; /* for directory notifications */
  511. #endif
  512. #ifdef CONFIG_INOTIFY
  513. struct list_head inotify_watches; /* watches on this inode */
  514. struct mutex inotify_mutex; /* protects the watches list */
  515. #endif
  516. unsigned long i_state;
  517. unsigned long dirtied_when; /* jiffies of first dirtying */
  518. unsigned int i_flags;
  519. atomic_t i_writecount;
  520. #ifdef CONFIG_SECURITY
  521. void *i_security;
  522. #endif
  523. void *i_private; /* fs or device private pointer */
  524. };
  525. /*
  526. * inode->i_mutex nesting subclasses for the lock validator:
  527. *
  528. * 0: the object of the current VFS operation
  529. * 1: parent
  530. * 2: child/target
  531. * 3: quota file
  532. *
  533. * The locking order between these classes is
  534. * parent -> child -> normal -> xattr -> quota
  535. */
  536. enum inode_i_mutex_lock_class
  537. {
  538. I_MUTEX_NORMAL,
  539. I_MUTEX_PARENT,
  540. I_MUTEX_CHILD,
  541. I_MUTEX_XATTR,
  542. I_MUTEX_QUOTA
  543. };
  544. extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
  545. extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
  546. /*
  547. * NOTE: in a 32bit arch with a preemptable kernel and
  548. * an UP compile the i_size_read/write must be atomic
  549. * with respect to the local cpu (unlike with preempt disabled),
  550. * but they don't need to be atomic with respect to other cpus like in
  551. * true SMP (so they need either to either locally disable irq around
  552. * the read or for example on x86 they can be still implemented as a
  553. * cmpxchg8b without the need of the lock prefix). For SMP compiles
  554. * and 64bit archs it makes no difference if preempt is enabled or not.
  555. */
  556. static inline loff_t i_size_read(const struct inode *inode)
  557. {
  558. #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
  559. loff_t i_size;
  560. unsigned int seq;
  561. do {
  562. seq = read_seqcount_begin(&inode->i_size_seqcount);
  563. i_size = inode->i_size;
  564. } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
  565. return i_size;
  566. #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
  567. loff_t i_size;
  568. preempt_disable();
  569. i_size = inode->i_size;
  570. preempt_enable();
  571. return i_size;
  572. #else
  573. return inode->i_size;
  574. #endif
  575. }
  576. /*
  577. * NOTE: unlike i_size_read(), i_size_write() does need locking around it
  578. * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
  579. * can be lost, resulting in subsequent i_size_read() calls spinning forever.
  580. */
  581. static inline void i_size_write(struct inode *inode, loff_t i_size)
  582. {
  583. #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
  584. write_seqcount_begin(&inode->i_size_seqcount);
  585. inode->i_size = i_size;
  586. write_seqcount_end(&inode->i_size_seqcount);
  587. #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
  588. preempt_disable();
  589. inode->i_size = i_size;
  590. preempt_enable();
  591. #else
  592. inode->i_size = i_size;
  593. #endif
  594. }
  595. static inline unsigned iminor(const struct inode *inode)
  596. {
  597. return MINOR(inode->i_rdev);
  598. }
  599. static inline unsigned imajor(const struct inode *inode)
  600. {
  601. return MAJOR(inode->i_rdev);
  602. }
  603. extern struct block_device *I_BDEV(struct inode *inode);
  604. struct fown_struct {
  605. rwlock_t lock; /* protects pid, uid, euid fields */
  606. struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
  607. enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
  608. uid_t uid, euid; /* uid/euid of process setting the owner */
  609. int signum; /* posix.1b rt signal to be delivered on IO */
  610. };
  611. /*
  612. * Track a single file's readahead state
  613. */
  614. struct file_ra_state {
  615. unsigned long start; /* Current window */
  616. unsigned long size;
  617. unsigned long flags; /* ra flags RA_FLAG_xxx*/
  618. unsigned long cache_hit; /* cache hit count*/
  619. unsigned long prev_page; /* Cache last read() position */
  620. unsigned long ahead_start; /* Ahead window */
  621. unsigned long ahead_size;
  622. unsigned long ra_pages; /* Maximum readahead window */
  623. unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
  624. unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
  625. };
  626. #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
  627. #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
  628. struct file {
  629. /*
  630. * fu_list becomes invalid after file_free is called and queued via
  631. * fu_rcuhead for RCU freeing
  632. */
  633. union {
  634. struct list_head fu_list;
  635. struct rcu_head fu_rcuhead;
  636. } f_u;
  637. struct path f_path;
  638. #define f_dentry f_path.dentry
  639. #define f_vfsmnt f_path.mnt
  640. const struct file_operations *f_op;
  641. atomic_t f_count;
  642. unsigned int f_flags;
  643. mode_t f_mode;
  644. loff_t f_pos;
  645. struct fown_struct f_owner;
  646. unsigned int f_uid, f_gid;
  647. struct file_ra_state f_ra;
  648. unsigned long f_version;
  649. #ifdef CONFIG_SECURITY
  650. void *f_security;
  651. #endif
  652. /* needed for tty driver, and maybe others */
  653. void *private_data;
  654. #ifdef CONFIG_EPOLL
  655. /* Used by fs/eventpoll.c to link all the hooks to this file */
  656. struct list_head f_ep_links;
  657. spinlock_t f_ep_lock;
  658. #endif /* #ifdef CONFIG_EPOLL */
  659. struct address_space *f_mapping;
  660. };
  661. extern spinlock_t files_lock;
  662. #define file_list_lock() spin_lock(&files_lock);
  663. #define file_list_unlock() spin_unlock(&files_lock);
  664. #define get_file(x) atomic_inc(&(x)->f_count)
  665. #define file_count(x) atomic_read(&(x)->f_count)
  666. #define MAX_NON_LFS ((1UL<<31) - 1)
  667. /* Page cache limit. The filesystems should put that into their s_maxbytes
  668. limits, otherwise bad things can happen in VM. */
  669. #if BITS_PER_LONG==32
  670. #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
  671. #elif BITS_PER_LONG==64
  672. #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
  673. #endif
  674. #define FL_POSIX 1
  675. #define FL_FLOCK 2
  676. #define FL_ACCESS 8 /* not trying to lock, just looking */
  677. #define FL_EXISTS 16 /* when unlocking, test for existence */
  678. #define FL_LEASE 32 /* lease held on this file */
  679. #define FL_CLOSE 64 /* unlock on close */
  680. #define FL_SLEEP 128 /* A blocking lock */
  681. /*
  682. * The POSIX file lock owner is determined by
  683. * the "struct files_struct" in the thread group
  684. * (or NULL for no owner - BSD locks).
  685. *
  686. * Lockd stuffs a "host" pointer into this.
  687. */
  688. typedef struct files_struct *fl_owner_t;
  689. struct file_lock_operations {
  690. void (*fl_insert)(struct file_lock *); /* lock insertion callback */
  691. void (*fl_remove)(struct file_lock *); /* lock removal callback */
  692. void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
  693. void (*fl_release_private)(struct file_lock *);
  694. };
  695. struct lock_manager_operations {
  696. int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
  697. void (*fl_notify)(struct file_lock *); /* unblock callback */
  698. void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
  699. void (*fl_release_private)(struct file_lock *);
  700. void (*fl_break)(struct file_lock *);
  701. int (*fl_mylease)(struct file_lock *, struct file_lock *);
  702. int (*fl_change)(struct file_lock **, int);
  703. };
  704. /* that will die - we need it for nfs_lock_info */
  705. #include <linux/nfs_fs_i.h>
  706. struct file_lock {
  707. struct file_lock *fl_next; /* singly linked list for this inode */
  708. struct list_head fl_link; /* doubly linked list of all locks */
  709. struct list_head fl_block; /* circular list of blocked processes */
  710. fl_owner_t fl_owner;
  711. unsigned int fl_pid;
  712. wait_queue_head_t fl_wait;
  713. struct file *fl_file;
  714. unsigned char fl_flags;
  715. unsigned char fl_type;
  716. loff_t fl_start;
  717. loff_t fl_end;
  718. struct fasync_struct * fl_fasync; /* for lease break notifications */
  719. unsigned long fl_break_time; /* for nonblocking lease breaks */
  720. struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
  721. struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
  722. union {
  723. struct nfs_lock_info nfs_fl;
  724. struct nfs4_lock_info nfs4_fl;
  725. } fl_u;
  726. };
  727. /* The following constant reflects the upper bound of the file/locking space */
  728. #ifndef OFFSET_MAX
  729. #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
  730. #define OFFSET_MAX INT_LIMIT(loff_t)
  731. #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
  732. #endif
  733. #include <linux/fcntl.h>
  734. extern int fcntl_getlk(struct file *, struct flock __user *);
  735. extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
  736. struct flock __user *);
  737. #if BITS_PER_LONG == 32
  738. extern int fcntl_getlk64(struct file *, struct flock64 __user *);
  739. extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
  740. struct flock64 __user *);
  741. #endif
  742. extern void send_sigio(struct fown_struct *fown, int fd, int band);
  743. extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
  744. extern int fcntl_getlease(struct file *filp);
  745. /* fs/sync.c */
  746. extern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte,
  747. unsigned int flags);
  748. /* fs/locks.c */
  749. extern void locks_init_lock(struct file_lock *);
  750. extern void locks_copy_lock(struct file_lock *, struct file_lock *);
  751. extern void locks_remove_posix(struct file *, fl_owner_t);
  752. extern void locks_remove_flock(struct file *);
  753. extern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *);
  754. extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *);
  755. extern int posix_lock_file(struct file *, struct file_lock *);
  756. extern int posix_lock_file_wait(struct file *, struct file_lock *);
  757. extern int posix_unblock_lock(struct file *, struct file_lock *);
  758. extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
  759. extern int __break_lease(struct inode *inode, unsigned int flags);
  760. extern void lease_get_mtime(struct inode *, struct timespec *time);
  761. extern int setlease(struct file *, long, struct file_lock **);
  762. extern int lease_modify(struct file_lock **, int);
  763. extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
  764. extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
  765. struct fasync_struct {
  766. int magic;
  767. int fa_fd;
  768. struct fasync_struct *fa_next; /* singly linked list */
  769. struct file *fa_file;
  770. };
  771. #define FASYNC_MAGIC 0x4601
  772. /* SMP safe fasync helpers: */
  773. extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
  774. /* can be called from interrupts */
  775. extern void kill_fasync(struct fasync_struct **, int, int);
  776. /* only for net: no internal synchronization */
  777. extern void __kill_fasync(struct fasync_struct *, int, int);
  778. extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
  779. extern int f_setown(struct file *filp, unsigned long arg, int force);
  780. extern void f_delown(struct file *filp);
  781. extern pid_t f_getown(struct file *filp);
  782. extern int send_sigurg(struct fown_struct *fown);
  783. /*
  784. * Umount options
  785. */
  786. #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
  787. #define MNT_DETACH 0x00000002 /* Just detach from the tree */
  788. #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
  789. extern struct list_head super_blocks;
  790. extern spinlock_t sb_lock;
  791. #define sb_entry(list) list_entry((list), struct super_block, s_list)
  792. #define S_BIAS (1<<30)
  793. struct super_block {
  794. struct list_head s_list; /* Keep this first */
  795. dev_t s_dev; /* search index; _not_ kdev_t */
  796. unsigned long s_blocksize;
  797. unsigned char s_blocksize_bits;
  798. unsigned char s_dirt;
  799. unsigned long long s_maxbytes; /* Max file size */
  800. struct file_system_type *s_type;
  801. const struct super_operations *s_op;
  802. struct dquot_operations *dq_op;
  803. struct quotactl_ops *s_qcop;
  804. struct export_operations *s_export_op;
  805. unsigned long s_flags;
  806. unsigned long s_magic;
  807. struct dentry *s_root;
  808. struct rw_semaphore s_umount;
  809. struct mutex s_lock;
  810. int s_count;
  811. int s_syncing;
  812. int s_need_sync_fs;
  813. atomic_t s_active;
  814. #ifdef CONFIG_SECURITY
  815. void *s_security;
  816. #endif
  817. struct xattr_handler **s_xattr;
  818. struct list_head s_inodes; /* all inodes */
  819. struct list_head s_dirty; /* dirty inodes */
  820. struct list_head s_io; /* parked for writeback */
  821. struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
  822. struct list_head s_files;
  823. struct block_device *s_bdev;
  824. struct list_head s_instances;
  825. struct quota_info s_dquot; /* Diskquota specific options */
  826. int s_frozen;
  827. wait_queue_head_t s_wait_unfrozen;
  828. char s_id[32]; /* Informational name */
  829. void *s_fs_info; /* Filesystem private info */
  830. /*
  831. * The next field is for VFS *only*. No filesystems have any business
  832. * even looking at it. You had been warned.
  833. */
  834. struct mutex s_vfs_rename_mutex; /* Kludge */
  835. /* Granularity of c/m/atime in ns.
  836. Cannot be worse than a second */
  837. u32 s_time_gran;
  838. };
  839. extern struct timespec current_fs_time(struct super_block *sb);
  840. /*
  841. * Snapshotting support.
  842. */
  843. enum {
  844. SB_UNFROZEN = 0,
  845. SB_FREEZE_WRITE = 1,
  846. SB_FREEZE_TRANS = 2,
  847. };
  848. #define vfs_check_frozen(sb, level) \
  849. wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
  850. #define get_fs_excl() atomic_inc(&current->fs_excl)
  851. #define put_fs_excl() atomic_dec(&current->fs_excl)
  852. #define has_fs_excl() atomic_read(&current->fs_excl)
  853. /* not quite ready to be deprecated, but... */
  854. extern void lock_super(struct super_block *);
  855. extern void unlock_super(struct super_block *);
  856. /*
  857. * VFS helper functions..
  858. */
  859. extern int vfs_permission(struct nameidata *, int);
  860. extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
  861. extern int vfs_mkdir(struct inode *, struct dentry *, int);
  862. extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
  863. extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
  864. extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
  865. extern int vfs_rmdir(struct inode *, struct dentry *);
  866. extern int vfs_unlink(struct inode *, struct dentry *);
  867. extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
  868. /*
  869. * VFS dentry helper functions.
  870. */
  871. extern void dentry_unhash(struct dentry *dentry);
  872. /*
  873. * VFS file helper functions.
  874. */
  875. extern int file_permission(struct file *, int);
  876. /*
  877. * File types
  878. *
  879. * NOTE! These match bits 12..15 of stat.st_mode
  880. * (ie "(i_mode >> 12) & 15").
  881. */
  882. #define DT_UNKNOWN 0
  883. #define DT_FIFO 1
  884. #define DT_CHR 2
  885. #define DT_DIR 4
  886. #define DT_BLK 6
  887. #define DT_REG 8
  888. #define DT_LNK 10
  889. #define DT_SOCK 12
  890. #define DT_WHT 14
  891. #define OSYNC_METADATA (1<<0)
  892. #define OSYNC_DATA (1<<1)
  893. #define OSYNC_INODE (1<<2)
  894. int generic_osync_inode(struct inode *, struct address_space *, int);
  895. /*
  896. * This is the "filldir" function type, used by readdir() to let
  897. * the kernel specify what kind of dirent layout it wants to have.
  898. * This allows the kernel to read directories into kernel space or
  899. * to have different dirent layouts depending on the binary type.
  900. */
  901. typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
  902. struct block_device_operations {
  903. int (*open) (struct inode *, struct file *);
  904. int (*release) (struct inode *, struct file *);
  905. int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
  906. long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
  907. long (*compat_ioctl) (struct file *, unsigned, unsigned long);
  908. int (*direct_access) (struct block_device *, sector_t, unsigned long *);
  909. int (*media_changed) (struct gendisk *);
  910. int (*revalidate_disk) (struct gendisk *);
  911. int (*getgeo)(struct block_device *, struct hd_geometry *);
  912. struct module *owner;
  913. };
  914. /*
  915. * "descriptor" for what we're up to with a read for sendfile().
  916. * This allows us to use the same read code yet
  917. * have multiple different users of the data that
  918. * we read from a file.
  919. *
  920. * The simplest case just copies the data to user
  921. * mode.
  922. */
  923. typedef struct {
  924. size_t written;
  925. size_t count;
  926. union {
  927. char __user * buf;
  928. void *data;
  929. } arg;
  930. int error;
  931. } read_descriptor_t;
  932. typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
  933. /* These macros are for out of kernel modules to test that
  934. * the kernel supports the unlocked_ioctl and compat_ioctl
  935. * fields in struct file_operations. */
  936. #define HAVE_COMPAT_IOCTL 1
  937. #define HAVE_UNLOCKED_IOCTL 1
  938. /*
  939. * NOTE:
  940. * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
  941. * can be called without the big kernel lock held in all filesystems.
  942. */
  943. struct file_operations {
  944. struct module *owner;
  945. loff_t (*llseek) (struct file *, loff_t, int);
  946. ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
  947. ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
  948. ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
  949. ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
  950. int (*readdir) (struct file *, void *, filldir_t);
  951. unsigned int (*poll) (struct file *, struct poll_table_struct *);
  952. int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
  953. long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
  954. long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
  955. int (*mmap) (struct file *, struct vm_area_struct *);
  956. int (*open) (struct inode *, struct file *);
  957. int (*flush) (struct file *, fl_owner_t id);
  958. int (*release) (struct inode *, struct file *);
  959. int (*fsync) (struct file *, struct dentry *, int datasync);
  960. int (*aio_fsync) (struct kiocb *, int datasync);
  961. int (*fasync) (int, struct file *, int);
  962. int (*lock) (struct file *, int, struct file_lock *);
  963. ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
  964. ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
  965. unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
  966. int (*check_flags)(int);
  967. int (*dir_notify)(struct file *filp, unsigned long arg);
  968. int (*flock) (struct file *, int, struct file_lock *);
  969. ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
  970. ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
  971. };
  972. struct inode_operations {
  973. int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
  974. struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
  975. int (*link) (struct dentry *,struct inode *,struct dentry *);
  976. int (*unlink) (struct inode *,struct dentry *);
  977. int (*symlink) (struct inode *,struct dentry *,const char *);
  978. int (*mkdir) (struct inode *,struct dentry *,int);
  979. int (*rmdir) (struct inode *,struct dentry *);
  980. int (*mknod) (struct inode *,struct dentry *,int,dev_t);
  981. int (*rename) (struct inode *, struct dentry *,
  982. struct inode *, struct dentry *);
  983. int (*readlink) (struct dentry *, char __user *,int);
  984. void * (*follow_link) (struct dentry *, struct nameidata *);
  985. void (*put_link) (struct dentry *, struct nameidata *, void *);
  986. void (*truncate) (struct inode *);
  987. int (*permission) (struct inode *, int, struct nameidata *);
  988. int (*setattr) (struct dentry *, struct iattr *);
  989. int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
  990. int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
  991. ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
  992. ssize_t (*listxattr) (struct dentry *, char *, size_t);
  993. int (*removexattr) (struct dentry *, const char *);
  994. void (*truncate_range)(struct inode *, loff_t, loff_t);
  995. };
  996. struct seq_file;
  997. ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
  998. unsigned long nr_segs, unsigned long fast_segs,
  999. struct iovec *fast_pointer,
  1000. struct iovec **ret_pointer);
  1001. extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
  1002. extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
  1003. extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
  1004. unsigned long, loff_t *);
  1005. extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
  1006. unsigned long, loff_t *);
  1007. /*
  1008. * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
  1009. * without the big kernel lock held in all filesystems.
  1010. */
  1011. struct super_operations {
  1012. struct inode *(*alloc_inode)(struct super_block *sb);
  1013. void (*destroy_inode)(struct inode *);
  1014. void (*read_inode) (struct inode *);
  1015. void (*dirty_inode) (struct inode *);
  1016. int (*write_inode) (struct inode *, int);
  1017. void (*put_inode) (struct inode *);
  1018. void (*drop_inode) (struct inode *);
  1019. void (*delete_inode) (struct inode *);
  1020. void (*put_super) (struct super_block *);
  1021. void (*write_super) (struct super_block *);
  1022. int (*sync_fs)(struct super_block *sb, int wait);
  1023. void (*write_super_lockfs) (struct super_block *);
  1024. void (*unlockfs) (struct super_block *);
  1025. int (*statfs) (struct dentry *, struct kstatfs *);
  1026. int (*remount_fs) (struct super_block *, int *, char *);
  1027. void (*clear_inode) (struct inode *);
  1028. void (*umount_begin) (struct vfsmount *, int);
  1029. int (*show_options)(struct seq_file *, struct vfsmount *);
  1030. int (*show_stats)(struct seq_file *, struct vfsmount *);
  1031. #ifdef CONFIG_QUOTA
  1032. ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
  1033. ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
  1034. #endif
  1035. };
  1036. /* Inode state bits. Protected by inode_lock. */
  1037. #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
  1038. #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
  1039. #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
  1040. #define __I_LOCK 3
  1041. #define I_LOCK (1 << __I_LOCK)
  1042. #define I_FREEING 16
  1043. #define I_CLEAR 32
  1044. #define I_NEW 64
  1045. #define I_WILL_FREE 128
  1046. #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
  1047. extern void __mark_inode_dirty(struct inode *, int);
  1048. static inline void mark_inode_dirty(struct inode *inode)
  1049. {
  1050. __mark_inode_dirty(inode, I_DIRTY);
  1051. }
  1052. static inline void mark_inode_dirty_sync(struct inode *inode)
  1053. {
  1054. __mark_inode_dirty(inode, I_DIRTY_SYNC);
  1055. }
  1056. static inline void inc_nlink(struct inode *inode)
  1057. {
  1058. inode->i_nlink++;
  1059. }
  1060. static inline void inode_inc_link_count(struct inode *inode)
  1061. {
  1062. inc_nlink(inode);
  1063. mark_inode_dirty(inode);
  1064. }
  1065. static inline void drop_nlink(struct inode *inode)
  1066. {
  1067. inode->i_nlink--;
  1068. }
  1069. static inline void clear_nlink(struct inode *inode)
  1070. {
  1071. inode->i_nlink = 0;
  1072. }
  1073. static inline void inode_dec_link_count(struct inode *inode)
  1074. {
  1075. drop_nlink(inode);
  1076. mark_inode_dirty(inode);
  1077. }
  1078. extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
  1079. static inline void file_accessed(struct file *file)
  1080. {
  1081. if (!(file->f_flags & O_NOATIME))
  1082. touch_atime(file->f_path.mnt, file->f_path.dentry);
  1083. }
  1084. int sync_inode(struct inode *inode, struct writeback_control *wbc);
  1085. /**
  1086. * struct export_operations - for nfsd to communicate with file systems
  1087. * @decode_fh: decode a file handle fragment and return a &struct dentry
  1088. * @encode_fh: encode a file handle fragment from a dentry
  1089. * @get_name: find the name for a given inode in a given directory
  1090. * @get_parent: find the parent of a given directory
  1091. * @get_dentry: find a dentry for the inode given a file handle sub-fragment
  1092. * @find_exported_dentry:
  1093. * set by the exporting module to a standard helper function.
  1094. *
  1095. * Description:
  1096. * The export_operations structure provides a means for nfsd to communicate
  1097. * with a particular exported file system - particularly enabling nfsd and
  1098. * the filesystem to co-operate when dealing with file handles.
  1099. *
  1100. * export_operations contains two basic operation for dealing with file
  1101. * handles, decode_fh() and encode_fh(), and allows for some other
  1102. * operations to be defined which standard helper routines use to get
  1103. * specific information from the filesystem.
  1104. *
  1105. * nfsd encodes information use to determine which filesystem a filehandle
  1106. * applies to in the initial part of the file handle. The remainder, termed
  1107. * a file handle fragment, is controlled completely by the filesystem. The
  1108. * standard helper routines assume that this fragment will contain one or
  1109. * two sub-fragments, one which identifies the file, and one which may be
  1110. * used to identify the (a) directory containing the file.
  1111. *
  1112. * In some situations, nfsd needs to get a dentry which is connected into a
  1113. * specific part of the file tree. To allow for this, it passes the
  1114. * function acceptable() together with a @context which can be used to see
  1115. * if the dentry is acceptable. As there can be multiple dentrys for a
  1116. * given file, the filesystem should check each one for acceptability before
  1117. * looking for the next. As soon as an acceptable one is found, it should
  1118. * be returned.
  1119. *
  1120. * decode_fh:
  1121. * @decode_fh is given a &struct super_block (@sb), a file handle fragment
  1122. * (@fh, @fh_len) and an acceptability testing function (@acceptable,
  1123. * @context). It should return a &struct dentry which refers to the same
  1124. * file that the file handle fragment refers to, and which passes the
  1125. * acceptability test. If it cannot, it should return a %NULL pointer if
  1126. * the file was found but no acceptable &dentries were available, or a
  1127. * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
  1128. * %ENOMEM).
  1129. *
  1130. * encode_fh:
  1131. * @encode_fh should store in the file handle fragment @fh (using at most
  1132. * @max_len bytes) information that can be used by @decode_fh to recover the
  1133. * file refered to by the &struct dentry @de. If the @connectable flag is
  1134. * set, the encode_fh() should store sufficient information so that a good
  1135. * attempt can be made to find not only the file but also it's place in the
  1136. * filesystem. This typically means storing a reference to de->d_parent in
  1137. * the filehandle fragment. encode_fh() should return the number of bytes
  1138. * stored or a negative error code such as %-ENOSPC
  1139. *
  1140. * get_name:
  1141. * @get_name should find a name for the given @child in the given @parent
  1142. * directory. The name should be stored in the @name (with the
  1143. * understanding that it is already pointing to a a %NAME_MAX+1 sized
  1144. * buffer. get_name() should return %0 on success, a negative error code
  1145. * or error. @get_name will be called without @parent->i_mutex held.
  1146. *
  1147. * get_parent:
  1148. * @get_parent should find the parent directory for the given @child which
  1149. * is also a directory. In the event that it cannot be found, or storage
  1150. * space cannot be allocated, a %ERR_PTR should be returned.
  1151. *
  1152. * get_dentry:
  1153. * Given a &super_block (@sb) and a pointer to a file-system specific inode
  1154. * identifier, possibly an inode number, (@inump) get_dentry() should find
  1155. * the identified inode and return a dentry for that inode. Any suitable
  1156. * dentry can be returned including, if necessary, a new dentry created with
  1157. * d_alloc_root. The caller can then find any other extant dentrys by
  1158. * following the d_alias links. If a new dentry was created using
  1159. * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
  1160. * should be d_rehash()ed.
  1161. *
  1162. * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
  1163. * can be returned. The @inump will be whatever was passed to
  1164. * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
  1165. *
  1166. * Locking rules:
  1167. * get_parent is called with child->d_inode->i_mutex down
  1168. * get_name is not (which is possibly inconsistent)
  1169. */
  1170. struct export_operations {
  1171. struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
  1172. int (*acceptable)(void *context, struct dentry *de),
  1173. void *context);
  1174. int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
  1175. int connectable);
  1176. /* the following are only called from the filesystem itself */
  1177. int (*get_name)(struct dentry *parent, char *name,
  1178. struct dentry *child);
  1179. struct dentry * (*get_parent)(struct dentry *child);
  1180. struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
  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. extern struct dentry *
  1188. find_exported_dentry(struct super_block *sb, void *obj, void *parent,
  1189. int (*acceptable)(void *context, struct dentry *de),
  1190. void *context);
  1191. struct file_system_type {
  1192. const char *name;
  1193. int fs_flags;
  1194. int (*get_sb) (struct file_system_type *, int,
  1195. const char *, void *, struct vfsmount *);
  1196. void (*kill_sb) (struct super_block *);
  1197. struct module *owner;
  1198. struct file_system_type * next;
  1199. struct list_head fs_supers;
  1200. struct lock_class_key s_lock_key;
  1201. struct lock_class_key s_umount_key;
  1202. };
  1203. extern int get_sb_bdev(struct file_system_type *fs_type,
  1204. int flags, const char *dev_name, void *data,
  1205. int (*fill_super)(struct super_block *, void *, int),
  1206. struct vfsmount *mnt);
  1207. extern int get_sb_single(struct file_system_type *fs_type,
  1208. int flags, void *data,
  1209. int (*fill_super)(struct super_block *, void *, int),
  1210. struct vfsmount *mnt);
  1211. extern int get_sb_nodev(struct file_system_type *fs_type,
  1212. int flags, void *data,
  1213. int (*fill_super)(struct super_block *, void *, int),
  1214. struct vfsmount *mnt);
  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. extern int get_sb_pseudo(struct file_system_type *, char *,
  1226. const struct super_operations *ops, unsigned long,
  1227. struct vfsmount *mnt);
  1228. extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
  1229. int __put_super(struct super_block *sb);
  1230. int __put_super_and_need_restart(struct super_block *sb);
  1231. void unnamed_dev_init(void);
  1232. /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
  1233. #define fops_get(fops) \
  1234. (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
  1235. #define fops_put(fops) \
  1236. do { if (fops) module_put((fops)->owner); } while(0)
  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 void umount_tree(struct vfsmount *, int, struct list_head *);
  1243. extern void release_mounts(struct list_head *);
  1244. extern long do_mount(char *, char *, char *, unsigned long, void *);
  1245. extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
  1246. extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
  1247. struct vfsmount *);
  1248. extern int vfs_statfs(struct dentry *, struct kstatfs *);
  1249. /* /sys/fs */
  1250. extern struct subsystem fs_subsys;
  1251. #define FLOCK_VERIFY_READ 1
  1252. #define FLOCK_VERIFY_WRITE 2
  1253. extern int locks_mandatory_locked(struct inode *);
  1254. extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
  1255. /*
  1256. * Candidates for mandatory locking have the setgid bit set
  1257. * but no group execute bit - an otherwise meaningless combination.
  1258. */
  1259. #define MANDATORY_LOCK(inode) \
  1260. (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
  1261. static inline int locks_verify_locked(struct inode *inode)
  1262. {
  1263. if (MANDATORY_LOCK(inode))
  1264. return locks_mandatory_locked(inode);
  1265. return 0;
  1266. }
  1267. extern int rw_verify_area(int, struct file *, loff_t *, size_t);
  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. static inline int break_lease(struct inode *inode, unsigned int mode)
  1282. {
  1283. if (inode->i_flock)
  1284. return __break_lease(inode, mode);
  1285. return 0;
  1286. }
  1287. /* fs/open.c */
  1288. extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
  1289. struct file *filp);
  1290. extern long do_sys_open(int fdf, const char __user *filename, int flags,
  1291. int mode);
  1292. extern struct file *filp_open(const char *, int, int);
  1293. extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
  1294. extern int filp_close(struct file *, fl_owner_t id);
  1295. extern char * getname(const char __user *);
  1296. /* fs/dcache.c */
  1297. extern void __init vfs_caches_init_early(void);
  1298. extern void __init vfs_caches_init(unsigned long);
  1299. extern struct kmem_cache *names_cachep;
  1300. #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
  1301. #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
  1302. #ifndef CONFIG_AUDITSYSCALL
  1303. #define putname(name) __putname(name)
  1304. #else
  1305. extern void putname(const char *name);
  1306. #endif
  1307. #ifdef CONFIG_BLOCK
  1308. extern int register_blkdev(unsigned int, const char *);
  1309. extern int unregister_blkdev(unsigned int, const char *);
  1310. extern struct block_device *bdget(dev_t);
  1311. extern void bd_set_size(struct block_device *, loff_t size);
  1312. extern void bd_forget(struct inode *inode);
  1313. extern void bdput(struct block_device *);
  1314. extern struct block_device *open_by_devnum(dev_t, unsigned);
  1315. extern const struct address_space_operations def_blk_aops;
  1316. #else
  1317. static inline void bd_forget(struct inode *inode) {}
  1318. #endif
  1319. extern const struct file_operations def_blk_fops;
  1320. extern const struct file_operations def_chr_fops;
  1321. extern const struct file_operations bad_sock_fops;
  1322. extern const struct file_operations def_fifo_fops;
  1323. #ifdef CONFIG_BLOCK
  1324. extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
  1325. extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
  1326. extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
  1327. struct gendisk *disk, unsigned cmd,
  1328. unsigned long arg);
  1329. extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
  1330. extern int blkdev_get(struct block_device *, mode_t, unsigned);
  1331. extern int blkdev_put(struct block_device *);
  1332. extern int bd_claim(struct block_device *, void *);
  1333. extern void bd_release(struct block_device *);
  1334. #ifdef CONFIG_SYSFS
  1335. extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
  1336. extern void bd_release_from_disk(struct block_device *, struct gendisk *);
  1337. #else
  1338. #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
  1339. #define bd_release_from_disk(bdev, disk) bd_release(bdev)
  1340. #endif
  1341. #endif
  1342. /* fs/char_dev.c */
  1343. #define CHRDEV_MAJOR_HASH_SIZE 255
  1344. extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
  1345. extern int register_chrdev_region(dev_t, unsigned, const char *);
  1346. extern int register_chrdev(unsigned int, const char *,
  1347. const struct file_operations *);
  1348. extern int unregister_chrdev(unsigned int, const char *);
  1349. extern void unregister_chrdev_region(dev_t, unsigned);
  1350. extern int chrdev_open(struct inode *, struct file *);
  1351. extern void chrdev_show(struct seq_file *,off_t);
  1352. /* fs/block_dev.c */
  1353. #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
  1354. #ifdef CONFIG_BLOCK
  1355. #define BLKDEV_MAJOR_HASH_SIZE 255
  1356. extern const char *__bdevname(dev_t, char *buffer);
  1357. extern const char *bdevname(struct block_device *bdev, char *buffer);
  1358. extern struct block_device *lookup_bdev(const char *);
  1359. extern struct block_device *open_bdev_excl(const char *, int, void *);
  1360. extern void close_bdev_excl(struct block_device *);
  1361. extern void blkdev_show(struct seq_file *,off_t);
  1362. #else
  1363. #define BLKDEV_MAJOR_HASH_SIZE 0
  1364. #endif
  1365. extern void init_special_inode(struct inode *, umode_t, dev_t);
  1366. /* Invalid inode operations -- fs/bad_inode.c */
  1367. extern void make_bad_inode(struct inode *);
  1368. extern int is_bad_inode(struct inode *);
  1369. extern const struct file_operations read_fifo_fops;
  1370. extern const struct file_operations write_fifo_fops;
  1371. extern const struct file_operations rdwr_fifo_fops;
  1372. extern int fs_may_remount_ro(struct super_block *);
  1373. #ifdef CONFIG_BLOCK
  1374. /*
  1375. * return READ, READA, or WRITE
  1376. */
  1377. #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
  1378. /*
  1379. * return data direction, READ or WRITE
  1380. */
  1381. #define bio_data_dir(bio) ((bio)->bi_rw & 1)
  1382. extern int check_disk_change(struct block_device *);
  1383. extern int __invalidate_device(struct block_device *);
  1384. extern int invalidate_partition(struct gendisk *, int);
  1385. #endif
  1386. extern int invalidate_inodes(struct super_block *);
  1387. unsigned long invalidate_mapping_pages(struct address_space *mapping,
  1388. pgoff_t start, pgoff_t end);
  1389. static inline unsigned long __deprecated
  1390. invalidate_inode_pages(struct address_space *mapping)
  1391. {
  1392. return invalidate_mapping_pages(mapping, 0, ~0UL);
  1393. }
  1394. static inline void invalidate_remote_inode(struct inode *inode)
  1395. {
  1396. if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
  1397. S_ISLNK(inode->i_mode))
  1398. invalidate_mapping_pages(inode->i_mapping, 0, -1);
  1399. }
  1400. extern int invalidate_inode_pages2(struct address_space *mapping);
  1401. extern int invalidate_inode_pages2_range(struct address_space *mapping,
  1402. pgoff_t start, pgoff_t end);
  1403. extern int write_inode_now(struct inode *, int);
  1404. extern int filemap_fdatawrite(struct address_space *);
  1405. extern int filemap_flush(struct address_space *);
  1406. extern int filemap_fdatawait(struct address_space *);
  1407. extern int filemap_write_and_wait(struct address_space *mapping);
  1408. extern int filemap_write_and_wait_range(struct address_space *mapping,
  1409. loff_t lstart, loff_t lend);
  1410. extern int wait_on_page_writeback_range(struct address_space *mapping,
  1411. pgoff_t start, pgoff_t end);
  1412. extern int __filemap_fdatawrite_range(struct address_space *mapping,
  1413. loff_t start, loff_t end, int sync_mode);
  1414. extern long do_fsync(struct file *file, int datasync);
  1415. extern void sync_supers(void);
  1416. extern void sync_filesystems(int wait);
  1417. extern void __fsync_super(struct super_block *sb);
  1418. extern void emergency_sync(void);
  1419. extern void emergency_remount(void);
  1420. extern int do_remount_sb(struct super_block *sb, int flags,
  1421. void *data, int force);
  1422. #ifdef CONFIG_BLOCK
  1423. extern sector_t bmap(struct inode *, sector_t);
  1424. #endif
  1425. extern int notify_change(struct dentry *, struct iattr *);
  1426. extern int permission(struct inode *, int, struct nameidata *);
  1427. extern int generic_permission(struct inode *, int,
  1428. int (*check_acl)(struct inode *, int));
  1429. extern int get_write_access(struct inode *);
  1430. extern int deny_write_access(struct file *);
  1431. static inline void put_write_access(struct inode * inode)
  1432. {
  1433. atomic_dec(&inode->i_writecount);
  1434. }
  1435. static inline void allow_write_access(struct file *file)
  1436. {
  1437. if (file)
  1438. atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
  1439. }
  1440. extern int do_pipe(int *);
  1441. extern struct file *create_read_pipe(struct file *f);
  1442. extern struct file *create_write_pipe(void);
  1443. extern void free_write_pipe(struct file *);
  1444. extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
  1445. extern int may_open(struct nameidata *, int, int);
  1446. extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
  1447. extern struct file * open_exec(const char *);
  1448. /* fs/dcache.c -- generic fs support functions */
  1449. extern int is_subdir(struct dentry *, struct dentry *);
  1450. extern ino_t find_inode_number(struct dentry *, struct qstr *);
  1451. #include <linux/err.h>
  1452. /* needed for stackable file system support */
  1453. extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
  1454. extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
  1455. extern void inode_init_once(struct inode *);
  1456. extern void iput(struct inode *);
  1457. extern struct inode * igrab(struct inode *);
  1458. extern ino_t iunique(struct super_block *, ino_t);
  1459. extern int inode_needs_sync(struct inode *inode);
  1460. extern void generic_delete_inode(struct inode *inode);
  1461. extern void generic_drop_inode(struct inode *inode);
  1462. extern struct inode *ilookup5_nowait(struct super_block *sb,
  1463. unsigned long hashval, int (*test)(struct inode *, void *),
  1464. void *data);
  1465. extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
  1466. int (*test)(struct inode *, void *), void *data);
  1467. extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
  1468. extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
  1469. extern struct inode * iget_locked(struct super_block *, unsigned long);
  1470. extern void unlock_new_inode(struct inode *);
  1471. static inline struct inode *iget(struct super_block *sb, unsigned long ino)
  1472. {
  1473. struct inode *inode = iget_locked(sb, ino);
  1474. if (inode && (inode->i_state & I_NEW)) {
  1475. sb->s_op->read_inode(inode);
  1476. unlock_new_inode(inode);
  1477. }
  1478. return inode;
  1479. }
  1480. extern void __iget(struct inode * inode);
  1481. extern void clear_inode(struct inode *);
  1482. extern void destroy_inode(struct inode *);
  1483. extern struct inode *new_inode(struct super_block *);
  1484. extern int __remove_suid(struct dentry *, int);
  1485. extern int should_remove_suid(struct dentry *);
  1486. extern int remove_suid(struct dentry *);
  1487. extern void __insert_inode_hash(struct inode *, unsigned long hashval);
  1488. extern void remove_inode_hash(struct inode *);
  1489. static inline void insert_inode_hash(struct inode *inode) {
  1490. __insert_inode_hash(inode, inode->i_ino);
  1491. }
  1492. extern struct file * get_empty_filp(void);
  1493. extern void file_move(struct file *f, struct list_head *list);
  1494. extern void file_kill(struct file *f);
  1495. #ifdef CONFIG_BLOCK
  1496. struct bio;
  1497. extern void submit_bio(int, struct bio *);
  1498. extern int bdev_read_only(struct block_device *);
  1499. #endif
  1500. extern int set_blocksize(struct block_device *, int);
  1501. extern int sb_set_blocksize(struct super_block *, int);
  1502. extern int sb_min_blocksize(struct super_block *, int);
  1503. extern int generic_file_mmap(struct file *, struct vm_area_struct *);
  1504. extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
  1505. extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
  1506. extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
  1507. int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
  1508. extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
  1509. extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
  1510. extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
  1511. unsigned long, loff_t);
  1512. extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
  1513. unsigned long *, loff_t, loff_t *, size_t, size_t);
  1514. extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
  1515. unsigned long, loff_t, loff_t *, size_t, ssize_t);
  1516. extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
  1517. extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
  1518. extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
  1519. extern void do_generic_mapping_read(struct address_space *mapping,
  1520. struct file_ra_state *, struct file *,
  1521. loff_t *, read_descriptor_t *, read_actor_t);
  1522. /* fs/splice.c */
  1523. extern ssize_t generic_file_splice_read(struct file *, loff_t *,
  1524. struct pipe_inode_info *, size_t, unsigned int);
  1525. extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
  1526. struct file *, loff_t *, size_t, unsigned int);
  1527. extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
  1528. struct file *, loff_t *, size_t, unsigned int);
  1529. extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
  1530. struct file *out, loff_t *, size_t len, unsigned int flags);
  1531. extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
  1532. size_t len, unsigned int flags);
  1533. extern void
  1534. file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
  1535. extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
  1536. extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
  1537. extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
  1538. extern int generic_file_open(struct inode * inode, struct file * filp);
  1539. extern int nonseekable_open(struct inode * inode, struct file * filp);
  1540. #ifdef CONFIG_FS_XIP
  1541. extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
  1542. loff_t *ppos);
  1543. extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
  1544. size_t count, read_actor_t actor,
  1545. void *target);
  1546. extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
  1547. extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
  1548. size_t len, loff_t *ppos);
  1549. extern int xip_truncate_page(struct address_space *mapping, loff_t from);
  1550. #else
  1551. static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
  1552. {
  1553. return 0;
  1554. }
  1555. #endif
  1556. static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
  1557. read_descriptor_t * desc,
  1558. read_actor_t actor)
  1559. {
  1560. do_generic_mapping_read(filp->f_mapping,
  1561. &filp->f_ra,
  1562. filp,
  1563. ppos,
  1564. desc,
  1565. actor);
  1566. }
  1567. #ifdef CONFIG_BLOCK
  1568. ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
  1569. struct block_device *bdev, const struct iovec *iov, loff_t offset,
  1570. unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
  1571. int lock_type);
  1572. enum {
  1573. DIO_LOCKING = 1, /* need locking between buffered and direct access */
  1574. DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
  1575. DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
  1576. };
  1577. static inline ssize_t blockdev_direct_IO(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_block_t get_block,
  1580. dio_iodone_t end_io)
  1581. {
  1582. return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
  1583. nr_segs, get_block, end_io, DIO_LOCKING);
  1584. }
  1585. static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
  1586. struct inode *inode, struct block_device *bdev, const struct iovec *iov,
  1587. loff_t offset, unsigned long nr_segs, get_block_t get_block,
  1588. dio_iodone_t end_io)
  1589. {
  1590. return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
  1591. nr_segs, get_block, end_io, DIO_NO_LOCKING);
  1592. }
  1593. static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
  1594. struct inode *inode, struct block_device *bdev, const struct iovec *iov,
  1595. loff_t offset, unsigned long nr_segs, get_block_t get_block,
  1596. dio_iodone_t end_io)
  1597. {
  1598. return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
  1599. nr_segs, get_block, end_io, DIO_OWN_LOCKING);
  1600. }
  1601. #endif
  1602. extern const struct file_operations generic_ro_fops;
  1603. #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
  1604. extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
  1605. extern int vfs_follow_link(struct nameidata *, const char *);
  1606. extern int page_readlink(struct dentry *, char __user *, int);
  1607. extern void *page_follow_link_light(struct dentry *, struct nameidata *);
  1608. extern void page_put_link(struct dentry *, struct nameidata *, void *);
  1609. extern int __page_symlink(struct inode *inode, const char *symname, int len,
  1610. gfp_t gfp_mask);
  1611. extern int page_symlink(struct inode *inode, const char *symname, int len);
  1612. extern const struct inode_operations page_symlink_inode_operations;
  1613. extern int generic_readlink(struct dentry *, char __user *, int);
  1614. extern void generic_fillattr(struct inode *, struct kstat *);
  1615. extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
  1616. void inode_add_bytes(struct inode *inode, loff_t bytes);
  1617. void inode_sub_bytes(struct inode *inode, loff_t bytes);
  1618. loff_t inode_get_bytes(struct inode *inode);
  1619. void inode_set_bytes(struct inode *inode, loff_t bytes);
  1620. extern int vfs_readdir(struct file *, filldir_t, void *);
  1621. extern int vfs_stat(char __user *, struct kstat *);
  1622. extern int vfs_lstat(char __user *, struct kstat *);
  1623. extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
  1624. extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
  1625. extern int vfs_fstat(unsigned int, struct kstat *);
  1626. extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
  1627. extern struct file_system_type *get_fs_type(const char *name);
  1628. extern struct super_block *get_super(struct block_device *);
  1629. extern struct super_block *user_get_super(dev_t);
  1630. extern void drop_super(struct super_block *sb);
  1631. extern int dcache_dir_open(struct inode *, struct file *);
  1632. extern int dcache_dir_close(struct inode *, struct file *);
  1633. extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
  1634. extern int dcache_readdir(struct file *, void *, filldir_t);
  1635. extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
  1636. extern int simple_statfs(struct dentry *, struct kstatfs *);
  1637. extern int simple_link(struct dentry *, struct inode *, struct dentry *);
  1638. extern int simple_unlink(struct inode *, struct dentry *);
  1639. extern int simple_rmdir(struct inode *, struct dentry *);
  1640. extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
  1641. extern int simple_sync_file(struct file *, struct dentry *, int);
  1642. extern int simple_empty(struct dentry *);
  1643. extern int simple_readpage(struct file *file, struct page *page);
  1644. extern int simple_prepare_write(struct file *file, struct page *page,
  1645. unsigned offset, unsigned to);
  1646. extern int simple_commit_write(struct file *file, struct page *page,
  1647. unsigned offset, unsigned to);
  1648. extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
  1649. extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
  1650. extern const struct file_operations simple_dir_operations;
  1651. extern const struct inode_operations simple_dir_inode_operations;
  1652. struct tree_descr { char *name; const struct file_operations *ops; int mode; };
  1653. struct dentry *d_alloc_name(struct dentry *, const char *);
  1654. extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
  1655. extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
  1656. extern void simple_release_fs(struct vfsmount **mount, int *count);
  1657. extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
  1658. #ifdef CONFIG_MIGRATION
  1659. extern int buffer_migrate_page(struct address_space *,
  1660. struct page *, struct page *);
  1661. #else
  1662. #define buffer_migrate_page NULL
  1663. #endif
  1664. extern int inode_change_ok(struct inode *, struct iattr *);
  1665. extern int __must_check inode_setattr(struct inode *, struct iattr *);
  1666. extern void file_update_time(struct file *file);
  1667. static inline ino_t parent_ino(struct dentry *dentry)
  1668. {
  1669. ino_t res;
  1670. spin_lock(&dentry->d_lock);
  1671. res = dentry->d_parent->d_inode->i_ino;
  1672. spin_unlock(&dentry->d_lock);
  1673. return res;
  1674. }
  1675. /* kernel/fork.c */
  1676. extern int unshare_files(void);
  1677. /* Transaction based IO helpers */
  1678. /*
  1679. * An argresp is stored in an allocated page and holds the
  1680. * size of the argument or response, along with its content
  1681. */
  1682. struct simple_transaction_argresp {
  1683. ssize_t size;
  1684. char data[0];
  1685. };
  1686. #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
  1687. char *simple_transaction_get(struct file *file, const char __user *buf,
  1688. size_t size);
  1689. ssize_t simple_transaction_read(struct file *file, char __user *buf,
  1690. size_t size, loff_t *pos);
  1691. int simple_transaction_release(struct inode *inode, struct file *file);
  1692. static inline void simple_transaction_set(struct file *file, size_t n)
  1693. {
  1694. struct simple_transaction_argresp *ar = file->private_data;
  1695. BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
  1696. /*
  1697. * The barrier ensures that ar->size will really remain zero until
  1698. * ar->data is ready for reading.
  1699. */
  1700. smp_mb();
  1701. ar->size = n;
  1702. }
  1703. /*
  1704. * simple attribute files
  1705. *
  1706. * These attributes behave similar to those in sysfs:
  1707. *
  1708. * Writing to an attribute immediately sets a value, an open file can be
  1709. * written to multiple times.
  1710. *
  1711. * Reading from an attribute creates a buffer from the value that might get
  1712. * read with multiple read calls. When the attribute has been read
  1713. * completely, no further read calls are possible until the file is opened
  1714. * again.
  1715. *
  1716. * All attributes contain a text representation of a numeric value
  1717. * that are accessed with the get() and set() functions.
  1718. */
  1719. #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
  1720. static int __fops ## _open(struct inode *inode, struct file *file) \
  1721. { \
  1722. __simple_attr_check_format(__fmt, 0ull); \
  1723. return simple_attr_open(inode, file, __get, __set, __fmt); \
  1724. } \
  1725. static struct file_operations __fops = { \
  1726. .owner = THIS_MODULE, \
  1727. .open = __fops ## _open, \
  1728. .release = simple_attr_close, \
  1729. .read = simple_attr_read, \
  1730. .write = simple_attr_write, \
  1731. };
  1732. static inline void __attribute__((format(printf, 1, 2)))
  1733. __simple_attr_check_format(const char *fmt, ...)
  1734. {
  1735. /* don't do anything, just let the compiler check the arguments; */
  1736. }
  1737. int simple_attr_open(struct inode *inode, struct file *file,
  1738. u64 (*get)(void *), void (*set)(void *, u64),
  1739. const char *fmt);
  1740. int simple_attr_close(struct inode *inode, struct file *file);
  1741. ssize_t simple_attr_read(struct file *file, char __user *buf,
  1742. size_t len, loff_t *ppos);
  1743. ssize_t simple_attr_write(struct file *file, const char __user *buf,
  1744. size_t len, loff_t *ppos);
  1745. #ifdef CONFIG_SECURITY
  1746. static inline char *alloc_secdata(void)
  1747. {
  1748. return (char *)get_zeroed_page(GFP_KERNEL);
  1749. }
  1750. static inline void free_secdata(void *secdata)
  1751. {
  1752. free_page((unsigned long)secdata);
  1753. }
  1754. #else
  1755. static inline char *alloc_secdata(void)
  1756. {
  1757. return (char *)1;
  1758. }
  1759. static inline void free_secdata(void *secdata)
  1760. { }
  1761. #endif /* CONFIG_SECURITY */
  1762. #endif /* __KERNEL__ */
  1763. #endif /* _LINUX_FS_H */