ext3_fs.h 29 KB

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  1. /*
  2. * linux/include/linux/ext3_fs.h
  3. *
  4. * Copyright (C) 1992, 1993, 1994, 1995
  5. * Remy Card (card@masi.ibp.fr)
  6. * Laboratoire MASI - Institut Blaise Pascal
  7. * Universite Pierre et Marie Curie (Paris VI)
  8. *
  9. * from
  10. *
  11. * linux/include/linux/minix_fs.h
  12. *
  13. * Copyright (C) 1991, 1992 Linus Torvalds
  14. */
  15. #ifndef _LINUX_EXT3_FS_H
  16. #define _LINUX_EXT3_FS_H
  17. #include <linux/types.h>
  18. #include <linux/magic.h>
  19. /*
  20. * The second extended filesystem constants/structures
  21. */
  22. /*
  23. * Define EXT3FS_DEBUG to produce debug messages
  24. */
  25. #undef EXT3FS_DEBUG
  26. /*
  27. * Define EXT3_RESERVATION to reserve data blocks for expanding files
  28. */
  29. #define EXT3_DEFAULT_RESERVE_BLOCKS 8
  30. /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  31. #define EXT3_MAX_RESERVE_BLOCKS 1027
  32. #define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
  33. /*
  34. * Always enable hashed directories
  35. */
  36. #define CONFIG_EXT3_INDEX
  37. /*
  38. * Debug code
  39. */
  40. #ifdef EXT3FS_DEBUG
  41. #define ext3_debug(f, a...) \
  42. do { \
  43. printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
  44. __FILE__, __LINE__, __FUNCTION__); \
  45. printk (KERN_DEBUG f, ## a); \
  46. } while (0)
  47. #else
  48. #define ext3_debug(f, a...) do {} while (0)
  49. #endif
  50. /*
  51. * Special inodes numbers
  52. */
  53. #define EXT3_BAD_INO 1 /* Bad blocks inode */
  54. #define EXT3_ROOT_INO 2 /* Root inode */
  55. #define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
  56. #define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
  57. #define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
  58. #define EXT3_JOURNAL_INO 8 /* Journal inode */
  59. /* First non-reserved inode for old ext3 filesystems */
  60. #define EXT3_GOOD_OLD_FIRST_INO 11
  61. /*
  62. * Maximal count of links to a file
  63. */
  64. #define EXT3_LINK_MAX 32000
  65. /*
  66. * Macro-instructions used to manage several block sizes
  67. */
  68. #define EXT3_MIN_BLOCK_SIZE 1024
  69. #define EXT3_MAX_BLOCK_SIZE 4096
  70. #define EXT3_MIN_BLOCK_LOG_SIZE 10
  71. #ifdef __KERNEL__
  72. # define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
  73. #else
  74. # define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  75. #endif
  76. #define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
  77. #ifdef __KERNEL__
  78. # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
  79. #else
  80. # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
  81. #endif
  82. #ifdef __KERNEL__
  83. #define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
  84. #define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
  85. #define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
  86. #else
  87. #define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
  88. EXT3_GOOD_OLD_INODE_SIZE : \
  89. (s)->s_inode_size)
  90. #define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
  91. EXT3_GOOD_OLD_FIRST_INO : \
  92. (s)->s_first_ino)
  93. #endif
  94. /*
  95. * Macro-instructions used to manage fragments
  96. */
  97. #define EXT3_MIN_FRAG_SIZE 1024
  98. #define EXT3_MAX_FRAG_SIZE 4096
  99. #define EXT3_MIN_FRAG_LOG_SIZE 10
  100. #ifdef __KERNEL__
  101. # define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
  102. # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
  103. #else
  104. # define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
  105. # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
  106. #endif
  107. /*
  108. * Structure of a blocks group descriptor
  109. */
  110. struct ext3_group_desc
  111. {
  112. __le32 bg_block_bitmap; /* Blocks bitmap block */
  113. __le32 bg_inode_bitmap; /* Inodes bitmap block */
  114. __le32 bg_inode_table; /* Inodes table block */
  115. __le16 bg_free_blocks_count; /* Free blocks count */
  116. __le16 bg_free_inodes_count; /* Free inodes count */
  117. __le16 bg_used_dirs_count; /* Directories count */
  118. __u16 bg_pad;
  119. __le32 bg_reserved[3];
  120. };
  121. /*
  122. * Macro-instructions used to manage group descriptors
  123. */
  124. #ifdef __KERNEL__
  125. # define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
  126. # define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
  127. # define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
  128. # define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
  129. #else
  130. # define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
  131. # define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
  132. # define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
  133. #endif
  134. /*
  135. * Constants relative to the data blocks
  136. */
  137. #define EXT3_NDIR_BLOCKS 12
  138. #define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
  139. #define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
  140. #define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
  141. #define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
  142. /*
  143. * Inode flags
  144. */
  145. #define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
  146. #define EXT3_UNRM_FL 0x00000002 /* Undelete */
  147. #define EXT3_COMPR_FL 0x00000004 /* Compress file */
  148. #define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
  149. #define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
  150. #define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
  151. #define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
  152. #define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
  153. /* Reserved for compression usage... */
  154. #define EXT3_DIRTY_FL 0x00000100
  155. #define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
  156. #define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
  157. #define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
  158. /* End compression flags --- maybe not all used */
  159. #define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
  160. #define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
  161. #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
  162. #define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
  163. #define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
  164. #define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
  165. #define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
  166. #define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
  167. #define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
  168. /*
  169. * Inode dynamic state flags
  170. */
  171. #define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
  172. #define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
  173. #define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */
  174. /* Used to pass group descriptor data when online resize is done */
  175. struct ext3_new_group_input {
  176. __u32 group; /* Group number for this data */
  177. __u32 block_bitmap; /* Absolute block number of block bitmap */
  178. __u32 inode_bitmap; /* Absolute block number of inode bitmap */
  179. __u32 inode_table; /* Absolute block number of inode table start */
  180. __u32 blocks_count; /* Total number of blocks in this group */
  181. __u16 reserved_blocks; /* Number of reserved blocks in this group */
  182. __u16 unused;
  183. };
  184. /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
  185. struct ext3_new_group_data {
  186. __u32 group;
  187. __u32 block_bitmap;
  188. __u32 inode_bitmap;
  189. __u32 inode_table;
  190. __u32 blocks_count;
  191. __u16 reserved_blocks;
  192. __u16 unused;
  193. __u32 free_blocks_count;
  194. };
  195. /*
  196. * ioctl commands
  197. */
  198. #define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS
  199. #define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS
  200. #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
  201. #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
  202. #define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
  203. #define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
  204. #define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION
  205. #define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION
  206. #ifdef CONFIG_JBD_DEBUG
  207. #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
  208. #endif
  209. #define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
  210. #define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
  211. /*
  212. * ioctl commands in 32 bit emulation
  213. */
  214. #define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS
  215. #define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS
  216. #define EXT3_IOC32_GETVERSION _IOR('f', 3, int)
  217. #define EXT3_IOC32_SETVERSION _IOW('f', 4, int)
  218. #define EXT3_IOC32_GETRSVSZ _IOR('f', 5, int)
  219. #define EXT3_IOC32_SETRSVSZ _IOW('f', 6, int)
  220. #define EXT3_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
  221. #ifdef CONFIG_JBD_DEBUG
  222. #define EXT3_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
  223. #endif
  224. #define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
  225. #define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
  226. /*
  227. * Mount options
  228. */
  229. struct ext3_mount_options {
  230. unsigned long s_mount_opt;
  231. uid_t s_resuid;
  232. gid_t s_resgid;
  233. unsigned long s_commit_interval;
  234. #ifdef CONFIG_QUOTA
  235. int s_jquota_fmt;
  236. char *s_qf_names[MAXQUOTAS];
  237. #endif
  238. };
  239. /*
  240. * Structure of an inode on the disk
  241. */
  242. struct ext3_inode {
  243. __le16 i_mode; /* File mode */
  244. __le16 i_uid; /* Low 16 bits of Owner Uid */
  245. __le32 i_size; /* Size in bytes */
  246. __le32 i_atime; /* Access time */
  247. __le32 i_ctime; /* Creation time */
  248. __le32 i_mtime; /* Modification time */
  249. __le32 i_dtime; /* Deletion Time */
  250. __le16 i_gid; /* Low 16 bits of Group Id */
  251. __le16 i_links_count; /* Links count */
  252. __le32 i_blocks; /* Blocks count */
  253. __le32 i_flags; /* File flags */
  254. union {
  255. struct {
  256. __u32 l_i_reserved1;
  257. } linux1;
  258. struct {
  259. __u32 h_i_translator;
  260. } hurd1;
  261. struct {
  262. __u32 m_i_reserved1;
  263. } masix1;
  264. } osd1; /* OS dependent 1 */
  265. __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
  266. __le32 i_generation; /* File version (for NFS) */
  267. __le32 i_file_acl; /* File ACL */
  268. __le32 i_dir_acl; /* Directory ACL */
  269. __le32 i_faddr; /* Fragment address */
  270. union {
  271. struct {
  272. __u8 l_i_frag; /* Fragment number */
  273. __u8 l_i_fsize; /* Fragment size */
  274. __u16 i_pad1;
  275. __le16 l_i_uid_high; /* these 2 fields */
  276. __le16 l_i_gid_high; /* were reserved2[0] */
  277. __u32 l_i_reserved2;
  278. } linux2;
  279. struct {
  280. __u8 h_i_frag; /* Fragment number */
  281. __u8 h_i_fsize; /* Fragment size */
  282. __u16 h_i_mode_high;
  283. __u16 h_i_uid_high;
  284. __u16 h_i_gid_high;
  285. __u32 h_i_author;
  286. } hurd2;
  287. struct {
  288. __u8 m_i_frag; /* Fragment number */
  289. __u8 m_i_fsize; /* Fragment size */
  290. __u16 m_pad1;
  291. __u32 m_i_reserved2[2];
  292. } masix2;
  293. } osd2; /* OS dependent 2 */
  294. __le16 i_extra_isize;
  295. __le16 i_pad1;
  296. };
  297. #define i_size_high i_dir_acl
  298. #if defined(__KERNEL__) || defined(__linux__)
  299. #define i_reserved1 osd1.linux1.l_i_reserved1
  300. #define i_frag osd2.linux2.l_i_frag
  301. #define i_fsize osd2.linux2.l_i_fsize
  302. #define i_uid_low i_uid
  303. #define i_gid_low i_gid
  304. #define i_uid_high osd2.linux2.l_i_uid_high
  305. #define i_gid_high osd2.linux2.l_i_gid_high
  306. #define i_reserved2 osd2.linux2.l_i_reserved2
  307. #elif defined(__GNU__)
  308. #define i_translator osd1.hurd1.h_i_translator
  309. #define i_frag osd2.hurd2.h_i_frag;
  310. #define i_fsize osd2.hurd2.h_i_fsize;
  311. #define i_uid_high osd2.hurd2.h_i_uid_high
  312. #define i_gid_high osd2.hurd2.h_i_gid_high
  313. #define i_author osd2.hurd2.h_i_author
  314. #elif defined(__masix__)
  315. #define i_reserved1 osd1.masix1.m_i_reserved1
  316. #define i_frag osd2.masix2.m_i_frag
  317. #define i_fsize osd2.masix2.m_i_fsize
  318. #define i_reserved2 osd2.masix2.m_i_reserved2
  319. #endif /* defined(__KERNEL__) || defined(__linux__) */
  320. /*
  321. * File system states
  322. */
  323. #define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
  324. #define EXT3_ERROR_FS 0x0002 /* Errors detected */
  325. #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
  326. /*
  327. * Mount flags
  328. */
  329. #define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
  330. #define EXT3_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
  331. #define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
  332. #define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
  333. #define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
  334. #define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
  335. #define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
  336. #define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
  337. #define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
  338. #define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
  339. #define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
  340. #define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
  341. #define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
  342. #define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
  343. #define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
  344. #define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
  345. #define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
  346. #define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
  347. #define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
  348. #define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
  349. #define EXT3_MOUNT_NOBH 0x40000 /* No bufferheads */
  350. #define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
  351. #define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
  352. #define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
  353. /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
  354. #ifndef _LINUX_EXT2_FS_H
  355. #define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
  356. #define set_opt(o, opt) o |= EXT3_MOUNT_##opt
  357. #define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
  358. EXT3_MOUNT_##opt)
  359. #else
  360. #define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
  361. #define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
  362. #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
  363. #endif
  364. #define ext3_set_bit ext2_set_bit
  365. #define ext3_set_bit_atomic ext2_set_bit_atomic
  366. #define ext3_clear_bit ext2_clear_bit
  367. #define ext3_clear_bit_atomic ext2_clear_bit_atomic
  368. #define ext3_test_bit ext2_test_bit
  369. #define ext3_find_first_zero_bit ext2_find_first_zero_bit
  370. #define ext3_find_next_zero_bit ext2_find_next_zero_bit
  371. /*
  372. * Maximal mount counts between two filesystem checks
  373. */
  374. #define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
  375. #define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
  376. /*
  377. * Behaviour when detecting errors
  378. */
  379. #define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
  380. #define EXT3_ERRORS_RO 2 /* Remount fs read-only */
  381. #define EXT3_ERRORS_PANIC 3 /* Panic */
  382. #define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
  383. /*
  384. * Structure of the super block
  385. */
  386. struct ext3_super_block {
  387. /*00*/ __le32 s_inodes_count; /* Inodes count */
  388. __le32 s_blocks_count; /* Blocks count */
  389. __le32 s_r_blocks_count; /* Reserved blocks count */
  390. __le32 s_free_blocks_count; /* Free blocks count */
  391. /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
  392. __le32 s_first_data_block; /* First Data Block */
  393. __le32 s_log_block_size; /* Block size */
  394. __le32 s_log_frag_size; /* Fragment size */
  395. /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
  396. __le32 s_frags_per_group; /* # Fragments per group */
  397. __le32 s_inodes_per_group; /* # Inodes per group */
  398. __le32 s_mtime; /* Mount time */
  399. /*30*/ __le32 s_wtime; /* Write time */
  400. __le16 s_mnt_count; /* Mount count */
  401. __le16 s_max_mnt_count; /* Maximal mount count */
  402. __le16 s_magic; /* Magic signature */
  403. __le16 s_state; /* File system state */
  404. __le16 s_errors; /* Behaviour when detecting errors */
  405. __le16 s_minor_rev_level; /* minor revision level */
  406. /*40*/ __le32 s_lastcheck; /* time of last check */
  407. __le32 s_checkinterval; /* max. time between checks */
  408. __le32 s_creator_os; /* OS */
  409. __le32 s_rev_level; /* Revision level */
  410. /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
  411. __le16 s_def_resgid; /* Default gid for reserved blocks */
  412. /*
  413. * These fields are for EXT3_DYNAMIC_REV superblocks only.
  414. *
  415. * Note: the difference between the compatible feature set and
  416. * the incompatible feature set is that if there is a bit set
  417. * in the incompatible feature set that the kernel doesn't
  418. * know about, it should refuse to mount the filesystem.
  419. *
  420. * e2fsck's requirements are more strict; if it doesn't know
  421. * about a feature in either the compatible or incompatible
  422. * feature set, it must abort and not try to meddle with
  423. * things it doesn't understand...
  424. */
  425. __le32 s_first_ino; /* First non-reserved inode */
  426. __le16 s_inode_size; /* size of inode structure */
  427. __le16 s_block_group_nr; /* block group # of this superblock */
  428. __le32 s_feature_compat; /* compatible feature set */
  429. /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
  430. __le32 s_feature_ro_compat; /* readonly-compatible feature set */
  431. /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
  432. /*78*/ char s_volume_name[16]; /* volume name */
  433. /*88*/ char s_last_mounted[64]; /* directory where last mounted */
  434. /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
  435. /*
  436. * Performance hints. Directory preallocation should only
  437. * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
  438. */
  439. __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
  440. __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
  441. __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
  442. /*
  443. * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
  444. */
  445. /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
  446. /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
  447. __le32 s_journal_dev; /* device number of journal file */
  448. __le32 s_last_orphan; /* start of list of inodes to delete */
  449. __le32 s_hash_seed[4]; /* HTREE hash seed */
  450. __u8 s_def_hash_version; /* Default hash version to use */
  451. __u8 s_reserved_char_pad;
  452. __u16 s_reserved_word_pad;
  453. __le32 s_default_mount_opts;
  454. __le32 s_first_meta_bg; /* First metablock block group */
  455. __u32 s_reserved[190]; /* Padding to the end of the block */
  456. };
  457. #ifdef __KERNEL__
  458. #include <linux/ext3_fs_i.h>
  459. #include <linux/ext3_fs_sb.h>
  460. static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
  461. {
  462. return sb->s_fs_info;
  463. }
  464. static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
  465. {
  466. return container_of(inode, struct ext3_inode_info, vfs_inode);
  467. }
  468. static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
  469. {
  470. return ino == EXT3_ROOT_INO ||
  471. ino == EXT3_JOURNAL_INO ||
  472. ino == EXT3_RESIZE_INO ||
  473. (ino >= EXT3_FIRST_INO(sb) &&
  474. ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
  475. }
  476. #else
  477. /* Assume that user mode programs are passing in an ext3fs superblock, not
  478. * a kernel struct super_block. This will allow us to call the feature-test
  479. * macros from user land. */
  480. #define EXT3_SB(sb) (sb)
  481. #endif
  482. #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
  483. /*
  484. * Codes for operating systems
  485. */
  486. #define EXT3_OS_LINUX 0
  487. #define EXT3_OS_HURD 1
  488. #define EXT3_OS_MASIX 2
  489. #define EXT3_OS_FREEBSD 3
  490. #define EXT3_OS_LITES 4
  491. /*
  492. * Revision levels
  493. */
  494. #define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
  495. #define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
  496. #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
  497. #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
  498. #define EXT3_GOOD_OLD_INODE_SIZE 128
  499. /*
  500. * Feature set definitions
  501. */
  502. #define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
  503. ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
  504. #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
  505. ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
  506. #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
  507. ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
  508. #define EXT3_SET_COMPAT_FEATURE(sb,mask) \
  509. EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
  510. #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
  511. EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
  512. #define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
  513. EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
  514. #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
  515. EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
  516. #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
  517. EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
  518. #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
  519. EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
  520. #define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
  521. #define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
  522. #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
  523. #define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
  524. #define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
  525. #define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
  526. #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
  527. #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
  528. #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
  529. #define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
  530. #define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
  531. #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
  532. #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
  533. #define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
  534. #define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
  535. #define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
  536. EXT3_FEATURE_INCOMPAT_RECOVER| \
  537. EXT3_FEATURE_INCOMPAT_META_BG)
  538. #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
  539. EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
  540. EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
  541. /*
  542. * Default values for user and/or group using reserved blocks
  543. */
  544. #define EXT3_DEF_RESUID 0
  545. #define EXT3_DEF_RESGID 0
  546. /*
  547. * Default mount options
  548. */
  549. #define EXT3_DEFM_DEBUG 0x0001
  550. #define EXT3_DEFM_BSDGROUPS 0x0002
  551. #define EXT3_DEFM_XATTR_USER 0x0004
  552. #define EXT3_DEFM_ACL 0x0008
  553. #define EXT3_DEFM_UID16 0x0010
  554. #define EXT3_DEFM_JMODE 0x0060
  555. #define EXT3_DEFM_JMODE_DATA 0x0020
  556. #define EXT3_DEFM_JMODE_ORDERED 0x0040
  557. #define EXT3_DEFM_JMODE_WBACK 0x0060
  558. /*
  559. * Structure of a directory entry
  560. */
  561. #define EXT3_NAME_LEN 255
  562. struct ext3_dir_entry {
  563. __le32 inode; /* Inode number */
  564. __le16 rec_len; /* Directory entry length */
  565. __le16 name_len; /* Name length */
  566. char name[EXT3_NAME_LEN]; /* File name */
  567. };
  568. /*
  569. * The new version of the directory entry. Since EXT3 structures are
  570. * stored in intel byte order, and the name_len field could never be
  571. * bigger than 255 chars, it's safe to reclaim the extra byte for the
  572. * file_type field.
  573. */
  574. struct ext3_dir_entry_2 {
  575. __le32 inode; /* Inode number */
  576. __le16 rec_len; /* Directory entry length */
  577. __u8 name_len; /* Name length */
  578. __u8 file_type;
  579. char name[EXT3_NAME_LEN]; /* File name */
  580. };
  581. /*
  582. * Ext3 directory file types. Only the low 3 bits are used. The
  583. * other bits are reserved for now.
  584. */
  585. #define EXT3_FT_UNKNOWN 0
  586. #define EXT3_FT_REG_FILE 1
  587. #define EXT3_FT_DIR 2
  588. #define EXT3_FT_CHRDEV 3
  589. #define EXT3_FT_BLKDEV 4
  590. #define EXT3_FT_FIFO 5
  591. #define EXT3_FT_SOCK 6
  592. #define EXT3_FT_SYMLINK 7
  593. #define EXT3_FT_MAX 8
  594. /*
  595. * EXT3_DIR_PAD defines the directory entries boundaries
  596. *
  597. * NOTE: It must be a multiple of 4
  598. */
  599. #define EXT3_DIR_PAD 4
  600. #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
  601. #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
  602. ~EXT3_DIR_ROUND)
  603. /*
  604. * Hash Tree Directory indexing
  605. * (c) Daniel Phillips, 2001
  606. */
  607. #ifdef CONFIG_EXT3_INDEX
  608. #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
  609. EXT3_FEATURE_COMPAT_DIR_INDEX) && \
  610. (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
  611. #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
  612. #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
  613. #else
  614. #define is_dx(dir) 0
  615. #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
  616. #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
  617. #endif
  618. /* Legal values for the dx_root hash_version field: */
  619. #define DX_HASH_LEGACY 0
  620. #define DX_HASH_HALF_MD4 1
  621. #define DX_HASH_TEA 2
  622. #ifdef __KERNEL__
  623. /* hash info structure used by the directory hash */
  624. struct dx_hash_info
  625. {
  626. u32 hash;
  627. u32 minor_hash;
  628. int hash_version;
  629. u32 *seed;
  630. };
  631. #define EXT3_HTREE_EOF 0x7fffffff
  632. /*
  633. * Control parameters used by ext3_htree_next_block
  634. */
  635. #define HASH_NB_ALWAYS 1
  636. /*
  637. * Describe an inode's exact location on disk and in memory
  638. */
  639. struct ext3_iloc
  640. {
  641. struct buffer_head *bh;
  642. unsigned long offset;
  643. unsigned long block_group;
  644. };
  645. static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
  646. {
  647. return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
  648. }
  649. /*
  650. * This structure is stuffed into the struct file's private_data field
  651. * for directories. It is where we put information so that we can do
  652. * readdir operations in hash tree order.
  653. */
  654. struct dir_private_info {
  655. struct rb_root root;
  656. struct rb_node *curr_node;
  657. struct fname *extra_fname;
  658. loff_t last_pos;
  659. __u32 curr_hash;
  660. __u32 curr_minor_hash;
  661. __u32 next_hash;
  662. };
  663. /* calculate the first block number of the group */
  664. static inline ext3_fsblk_t
  665. ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
  666. {
  667. return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
  668. le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
  669. }
  670. /*
  671. * Special error return code only used by dx_probe() and its callers.
  672. */
  673. #define ERR_BAD_DX_DIR -75000
  674. /*
  675. * Function prototypes
  676. */
  677. /*
  678. * Ok, these declarations are also in <linux/kernel.h> but none of the
  679. * ext3 source programs needs to include it so they are duplicated here.
  680. */
  681. # define NORET_TYPE /**/
  682. # define ATTRIB_NORET __attribute__((noreturn))
  683. # define NORET_AND noreturn,
  684. /* balloc.c */
  685. extern int ext3_bg_has_super(struct super_block *sb, int group);
  686. extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
  687. extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
  688. ext3_fsblk_t goal, int *errp);
  689. extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
  690. ext3_fsblk_t goal, unsigned long *count, int *errp);
  691. extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
  692. ext3_fsblk_t block, unsigned long count);
  693. extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
  694. ext3_fsblk_t block, unsigned long count,
  695. unsigned long *pdquot_freed_blocks);
  696. extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
  697. extern void ext3_check_blocks_bitmap (struct super_block *);
  698. extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
  699. unsigned int block_group,
  700. struct buffer_head ** bh);
  701. extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
  702. extern void ext3_init_block_alloc_info(struct inode *);
  703. extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
  704. /* dir.c */
  705. extern int ext3_check_dir_entry(const char *, struct inode *,
  706. struct ext3_dir_entry_2 *,
  707. struct buffer_head *, unsigned long);
  708. extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
  709. __u32 minor_hash,
  710. struct ext3_dir_entry_2 *dirent);
  711. extern void ext3_htree_free_dir_info(struct dir_private_info *p);
  712. /* fsync.c */
  713. extern int ext3_sync_file (struct file *, struct dentry *, int);
  714. /* hash.c */
  715. extern int ext3fs_dirhash(const char *name, int len, struct
  716. dx_hash_info *hinfo);
  717. /* ialloc.c */
  718. extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
  719. extern void ext3_free_inode (handle_t *, struct inode *);
  720. extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
  721. extern unsigned long ext3_count_free_inodes (struct super_block *);
  722. extern unsigned long ext3_count_dirs (struct super_block *);
  723. extern void ext3_check_inodes_bitmap (struct super_block *);
  724. extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
  725. /* inode.c */
  726. int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
  727. struct buffer_head *bh, ext3_fsblk_t blocknr);
  728. struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
  729. struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
  730. int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
  731. sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
  732. int create, int extend_disksize);
  733. extern void ext3_read_inode (struct inode *);
  734. extern int ext3_write_inode (struct inode *, int);
  735. extern int ext3_setattr (struct dentry *, struct iattr *);
  736. extern void ext3_delete_inode (struct inode *);
  737. extern int ext3_sync_inode (handle_t *, struct inode *);
  738. extern void ext3_discard_reservation (struct inode *);
  739. extern void ext3_dirty_inode(struct inode *);
  740. extern int ext3_change_inode_journal_flag(struct inode *, int);
  741. extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
  742. extern void ext3_truncate (struct inode *);
  743. extern void ext3_set_inode_flags(struct inode *);
  744. extern void ext3_set_aops(struct inode *inode);
  745. /* ioctl.c */
  746. extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
  747. unsigned long);
  748. extern long ext3_compat_ioctl (struct file *, unsigned int, unsigned long);
  749. /* namei.c */
  750. extern int ext3_orphan_add(handle_t *, struct inode *);
  751. extern int ext3_orphan_del(handle_t *, struct inode *);
  752. extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
  753. __u32 start_minor_hash, __u32 *next_hash);
  754. /* resize.c */
  755. extern int ext3_group_add(struct super_block *sb,
  756. struct ext3_new_group_data *input);
  757. extern int ext3_group_extend(struct super_block *sb,
  758. struct ext3_super_block *es,
  759. ext3_fsblk_t n_blocks_count);
  760. /* super.c */
  761. extern void ext3_error (struct super_block *, const char *, const char *, ...)
  762. __attribute__ ((format (printf, 3, 4)));
  763. extern void __ext3_std_error (struct super_block *, const char *, int);
  764. extern void ext3_abort (struct super_block *, const char *, const char *, ...)
  765. __attribute__ ((format (printf, 3, 4)));
  766. extern void ext3_warning (struct super_block *, const char *, const char *, ...)
  767. __attribute__ ((format (printf, 3, 4)));
  768. extern void ext3_update_dynamic_rev (struct super_block *sb);
  769. #define ext3_std_error(sb, errno) \
  770. do { \
  771. if ((errno)) \
  772. __ext3_std_error((sb), __FUNCTION__, (errno)); \
  773. } while (0)
  774. /*
  775. * Inodes and files operations
  776. */
  777. /* dir.c */
  778. extern const struct file_operations ext3_dir_operations;
  779. /* file.c */
  780. extern const struct inode_operations ext3_file_inode_operations;
  781. extern const struct file_operations ext3_file_operations;
  782. /* namei.c */
  783. extern const struct inode_operations ext3_dir_inode_operations;
  784. extern const struct inode_operations ext3_special_inode_operations;
  785. /* symlink.c */
  786. extern const struct inode_operations ext3_symlink_inode_operations;
  787. extern const struct inode_operations ext3_fast_symlink_inode_operations;
  788. #endif /* __KERNEL__ */
  789. #endif /* _LINUX_EXT3_FS_H */