ext4_jbd2.h 7.6 KB

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  1. /*
  2. * linux/include/linux/ext4_jbd2.h
  3. *
  4. * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
  5. *
  6. * Copyright 1998--1999 Red Hat corp --- All Rights Reserved
  7. *
  8. * This file is part of the Linux kernel and is made available under
  9. * the terms of the GNU General Public License, version 2, or at your
  10. * option, any later version, incorporated herein by reference.
  11. *
  12. * Ext4-specific journaling extensions.
  13. */
  14. #ifndef _LINUX_EXT4_JBD_H
  15. #define _LINUX_EXT4_JBD_H
  16. #include <linux/fs.h>
  17. #include <linux/jbd2.h>
  18. #include <linux/ext4_fs.h>
  19. #define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal)
  20. /* Define the number of blocks we need to account to a transaction to
  21. * modify one block of data.
  22. *
  23. * We may have to touch one inode, one bitmap buffer, up to three
  24. * indirection blocks, the group and superblock summaries, and the data
  25. * block to complete the transaction.
  26. *
  27. * For extents-enabled fs we may have to allocate and modify up to
  28. * 5 levels of tree + root which are stored in the inode. */
  29. #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \
  30. (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \
  31. || test_opt(sb, EXTENTS) ? 27U : 8U)
  32. /* Extended attribute operations touch at most two data buffers,
  33. * two bitmap buffers, and two group summaries, in addition to the inode
  34. * and the superblock, which are already accounted for. */
  35. #define EXT4_XATTR_TRANS_BLOCKS 6U
  36. /* Define the minimum size for a transaction which modifies data. This
  37. * needs to take into account the fact that we may end up modifying two
  38. * quota files too (one for the group, one for the user quota). The
  39. * superblock only gets updated once, of course, so don't bother
  40. * counting that again for the quota updates. */
  41. #define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \
  42. EXT4_XATTR_TRANS_BLOCKS - 2 + \
  43. 2*EXT4_QUOTA_TRANS_BLOCKS(sb))
  44. /* Delete operations potentially hit one directory's namespace plus an
  45. * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
  46. * generous. We can grow the delete transaction later if necessary. */
  47. #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64)
  48. /* Define an arbitrary limit for the amount of data we will anticipate
  49. * writing to any given transaction. For unbounded transactions such as
  50. * write(2) and truncate(2) we can write more than this, but we always
  51. * start off at the maximum transaction size and grow the transaction
  52. * optimistically as we go. */
  53. #define EXT4_MAX_TRANS_DATA 64U
  54. /* We break up a large truncate or write transaction once the handle's
  55. * buffer credits gets this low, we need either to extend the
  56. * transaction or to start a new one. Reserve enough space here for
  57. * inode, bitmap, superblock, group and indirection updates for at least
  58. * one block, plus two quota updates. Quota allocations are not
  59. * needed. */
  60. #define EXT4_RESERVE_TRANS_BLOCKS 12U
  61. #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8
  62. #ifdef CONFIG_QUOTA
  63. /* Amount of blocks needed for quota update - we know that the structure was
  64. * allocated so we need to update only inode+data */
  65. #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
  66. /* Amount of blocks needed for quota insert/delete - we do some block writes
  67. * but inode, sb and group updates are done only once */
  68. #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
  69. (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0)
  70. #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
  71. (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0)
  72. #else
  73. #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
  74. #define EXT4_QUOTA_INIT_BLOCKS(sb) 0
  75. #define EXT4_QUOTA_DEL_BLOCKS(sb) 0
  76. #endif
  77. int
  78. ext4_mark_iloc_dirty(handle_t *handle,
  79. struct inode *inode,
  80. struct ext4_iloc *iloc);
  81. /*
  82. * On success, We end up with an outstanding reference count against
  83. * iloc->bh. This _must_ be cleaned up later.
  84. */
  85. int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
  86. struct ext4_iloc *iloc);
  87. int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
  88. /*
  89. * Wrapper functions with which ext4 calls into JBD. The intent here is
  90. * to allow these to be turned into appropriate stubs so ext4 can control
  91. * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't
  92. * been done yet.
  93. */
  94. static inline void ext4_journal_release_buffer(handle_t *handle,
  95. struct buffer_head *bh)
  96. {
  97. jbd2_journal_release_buffer(handle, bh);
  98. }
  99. void ext4_journal_abort_handle(const char *caller, const char *err_fn,
  100. struct buffer_head *bh, handle_t *handle, int err);
  101. int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
  102. struct buffer_head *bh);
  103. int __ext4_journal_get_write_access(const char *where, handle_t *handle,
  104. struct buffer_head *bh);
  105. int __ext4_journal_forget(const char *where, handle_t *handle,
  106. struct buffer_head *bh);
  107. int __ext4_journal_revoke(const char *where, handle_t *handle,
  108. ext4_fsblk_t blocknr, struct buffer_head *bh);
  109. int __ext4_journal_get_create_access(const char *where,
  110. handle_t *handle, struct buffer_head *bh);
  111. int __ext4_journal_dirty_metadata(const char *where,
  112. handle_t *handle, struct buffer_head *bh);
  113. #define ext4_journal_get_undo_access(handle, bh) \
  114. __ext4_journal_get_undo_access(__FUNCTION__, (handle), (bh))
  115. #define ext4_journal_get_write_access(handle, bh) \
  116. __ext4_journal_get_write_access(__FUNCTION__, (handle), (bh))
  117. #define ext4_journal_revoke(handle, blocknr, bh) \
  118. __ext4_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
  119. #define ext4_journal_get_create_access(handle, bh) \
  120. __ext4_journal_get_create_access(__FUNCTION__, (handle), (bh))
  121. #define ext4_journal_dirty_metadata(handle, bh) \
  122. __ext4_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
  123. #define ext4_journal_forget(handle, bh) \
  124. __ext4_journal_forget(__FUNCTION__, (handle), (bh))
  125. int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
  126. handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
  127. int __ext4_journal_stop(const char *where, handle_t *handle);
  128. static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
  129. {
  130. return ext4_journal_start_sb(inode->i_sb, nblocks);
  131. }
  132. #define ext4_journal_stop(handle) \
  133. __ext4_journal_stop(__FUNCTION__, (handle))
  134. static inline handle_t *ext4_journal_current_handle(void)
  135. {
  136. return journal_current_handle();
  137. }
  138. static inline int ext4_journal_extend(handle_t *handle, int nblocks)
  139. {
  140. return jbd2_journal_extend(handle, nblocks);
  141. }
  142. static inline int ext4_journal_restart(handle_t *handle, int nblocks)
  143. {
  144. return jbd2_journal_restart(handle, nblocks);
  145. }
  146. static inline int ext4_journal_blocks_per_page(struct inode *inode)
  147. {
  148. return jbd2_journal_blocks_per_page(inode);
  149. }
  150. static inline int ext4_journal_force_commit(journal_t *journal)
  151. {
  152. return jbd2_journal_force_commit(journal);
  153. }
  154. /* super.c */
  155. int ext4_force_commit(struct super_block *sb);
  156. static inline int ext4_should_journal_data(struct inode *inode)
  157. {
  158. if (!S_ISREG(inode->i_mode))
  159. return 1;
  160. if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
  161. return 1;
  162. if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
  163. return 1;
  164. return 0;
  165. }
  166. static inline int ext4_should_order_data(struct inode *inode)
  167. {
  168. if (!S_ISREG(inode->i_mode))
  169. return 0;
  170. if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
  171. return 0;
  172. if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
  173. return 1;
  174. return 0;
  175. }
  176. static inline int ext4_should_writeback_data(struct inode *inode)
  177. {
  178. if (!S_ISREG(inode->i_mode))
  179. return 0;
  180. if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
  181. return 0;
  182. if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
  183. return 1;
  184. return 0;
  185. }
  186. #endif /* _LINUX_EXT4_JBD_H */