include/linux/ext3_jbd.h

   1 /*
   2  * linux/include/linux/ext3_jbd.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  * Ext3-specific journaling extensions.
  13  */
  14
  15 #ifndef _LINUX_EXT3_JBD_H
  16 #define _LINUX_EXT3_JBD_H
  17
  18 #include <linux/fs.h>
  19 #include <linux/jbd.h>
  20 #include <linux/ext3_fs.h>
  21
  22 #define EXT3_JOURNAL(inode)     (EXT3_SB((inode)->i_sb)->s_journal)
  23
  24 /* Define the number of blocks we need to account to a transaction to
  25  * modify one block of data.
  26  *
  27  * We may have to touch one inode, one bitmap buffer, up to three
  28  * indirection blocks, the group and superblock summaries, and the data
  29  * block to complete the transaction.  */
  30
  31 #define EXT3_SINGLEDATA_TRANS_BLOCKS    8U
  32
  33 /* Extended attribute operations touch at most two data buffers,
  34  * two bitmap buffers, and two group summaries, in addition to the inode
  35  * and the superblock, which are already accounted for. */
  36
  37 #define EXT3_XATTR_TRANS_BLOCKS         6U
  38
  39 /* Define the minimum size for a transaction which modifies data.  This
  40  * needs to take into account the fact that we may end up modifying two
  41  * quota files too (one for the group, one for the user quota).  The
  42  * superblock only gets updated once, of course, so don't bother
  43  * counting that again for the quota updates. */
  44
  45 #define EXT3_DATA_TRANS_BLOCKS          (EXT3_SINGLEDATA_TRANS_BLOCKS + \
  46                                          EXT3_XATTR_TRANS_BLOCKS - 2 + \
  47                                          2*EXT3_QUOTA_TRANS_BLOCKS)
  48
  49 /* Delete operations potentially hit one directory's namespace plus an
  50  * entire inode, plus arbitrary amounts of bitmap/indirection data.  Be
  51  * generous.  We can grow the delete transaction later if necessary. */
  52
  53 #define EXT3_DELETE_TRANS_BLOCKS        (2 * EXT3_DATA_TRANS_BLOCKS + 64)
  54
  55 /* Define an arbitrary limit for the amount of data we will anticipate
  56  * writing to any given transaction.  For unbounded transactions such as
  57  * write(2) and truncate(2) we can write more than this, but we always
  58  * start off at the maximum transaction size and grow the transaction
  59  * optimistically as we go. */
  60
  61 #define EXT3_MAX_TRANS_DATA             64U
  62
  63 /* We break up a large truncate or write transaction once the handle's
  64  * buffer credits gets this low, we need either to extend the
  65  * transaction or to start a new one.  Reserve enough space here for
  66  * inode, bitmap, superblock, group and indirection updates for at least
  67  * one block, plus two quota updates.  Quota allocations are not
  68  * needed. */
  69
  70 #define EXT3_RESERVE_TRANS_BLOCKS       12U
  71
  72 #define EXT3_INDEX_EXTRA_TRANS_BLOCKS   8
  73
  74 #ifdef CONFIG_QUOTA
  75 /* Amount of blocks needed for quota update - we know that the structure was
  76  * allocated so we need to update only inode+data */
  77 #define EXT3_QUOTA_TRANS_BLOCKS 2
  78 /* Amount of blocks needed for quota insert/delete - we do some block writes
  79  * but inode, sb and group updates are done only once */
  80 #define EXT3_QUOTA_INIT_BLOCKS (DQUOT_MAX_WRITES*\
  81                                 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3)
  82 #else
  83 #define EXT3_QUOTA_TRANS_BLOCKS 0
  84 #define EXT3_QUOTA_INIT_BLOCKS 0
  85 #endif
  86
  87 int
  88 ext3_mark_iloc_dirty(handle_t *handle,
  89                      struct inode *inode,
  90                      struct ext3_iloc *iloc);
  91
  92 /*
  93  * On success, We end up with an outstanding reference count against
  94  * iloc->bh.  This _must_ be cleaned up later.
  95  */
  96
  97 int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
  98                         struct ext3_iloc *iloc);
  99
 100 int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
 101
 102 /*
 103  * Wrapper functions with which ext3 calls into JBD.  The intent here is
 104  * to allow these to be turned into appropriate stubs so ext3 can control
 105  * ext2 filesystems, so ext2+ext3 systems only nee one fs.  This work hasn't
 106  * been done yet.
 107  */
 108
 109 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 110                 struct buffer_head *bh, handle_t *handle, int err);
 111
 112 static inline int
 113 __ext3_journal_get_undo_access(const char *where, handle_t *handle,
 114                                 struct buffer_head *bh)
 115 {
 116         int err = journal_get_undo_access(handle, bh);
 117         if (err)
 118                 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 119         return err;
 120 }
 121
 122 static inline int
 123 __ext3_journal_get_write_access(const char *where, handle_t *handle,
 124                                 struct buffer_head *bh)
 125 {
 126         int err = journal_get_write_access(handle, bh);
 127         if (err)
 128                 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 129         return err;
 130 }
 131
 132 static inline void
 133 ext3_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
 134 {
 135         journal_release_buffer(handle, bh);
 136 }
 137
 138 static inline int
 139 __ext3_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
 140 {
 141         int err = journal_forget(handle, bh);
 142         if (err)
 143                 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 144         return err;
 145 }
 146
 147 static inline int
 148 __ext3_journal_revoke(const char *where, handle_t *handle,
 149                       unsigned long blocknr, struct buffer_head *bh)
 150 {
 151         int err = journal_revoke(handle, blocknr, bh);
 152         if (err)
 153                 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 154         return err;
 155 }
 156
 157 static inline int
 158 __ext3_journal_get_create_access(const char *where,
 159                                  handle_t *handle, struct buffer_head *bh)
 160 {
 161         int err = journal_get_create_access(handle, bh);
 162         if (err)
 163                 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 164         return err;
 165 }
 166
 167 static inline int
 168 __ext3_journal_dirty_metadata(const char *where,
 169                               handle_t *handle, struct buffer_head *bh)
 170 {
 171         int err = journal_dirty_metadata(handle, bh);
 172         if (err)
 173                 ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 174         return err;
 175 }
 176
 177
 178 #define ext3_journal_get_undo_access(handle, bh) \
 179         __ext3_journal_get_undo_access(__FUNCTION__, (handle), (bh))
 180 #define ext3_journal_get_write_access(handle, bh) \
 181         __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh))
 182 #define ext3_journal_revoke(handle, blocknr, bh) \
 183         __ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
 184 #define ext3_journal_get_create_access(handle, bh) \
 185         __ext3_journal_get_create_access(__FUNCTION__, (handle), (bh))
 186 #define ext3_journal_dirty_metadata(handle, bh) \
 187         __ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
 188 #define ext3_journal_forget(handle, bh) \
 189         __ext3_journal_forget(__FUNCTION__, (handle), (bh))
 190
 191 int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
 192
 193 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
 194 int __ext3_journal_stop(const char *where, handle_t *handle);
 195
 196 static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
 197 {
 198         return ext3_journal_start_sb(inode->i_sb, nblocks);
 199 }
 200
 201 #define ext3_journal_stop(handle) \
 202         __ext3_journal_stop(__FUNCTION__, (handle))
 203
 204 static inline handle_t *ext3_journal_current_handle(void)
 205 {
 206         return journal_current_handle();
 207 }
 208
 209 static inline int ext3_journal_extend(handle_t *handle, int nblocks)
 210 {
 211         return journal_extend(handle, nblocks);
 212 }
 213
 214 static inline int ext3_journal_restart(handle_t *handle, int nblocks)
 215 {
 216         return journal_restart(handle, nblocks);
 217 }
 218
 219 static inline int ext3_journal_blocks_per_page(struct inode *inode)
 220 {
 221         return journal_blocks_per_page(inode);
 222 }
 223
 224 static inline int ext3_journal_force_commit(journal_t *journal)
 225 {
 226         return journal_force_commit(journal);
 227 }
 228
 229 /* super.c */
 230 int ext3_force_commit(struct super_block *sb);
 231
 232 static inline int ext3_should_journal_data(struct inode *inode)
 233 {
 234         if (!S_ISREG(inode->i_mode))
 235                 return 1;
 236         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 237                 return 1;
 238         if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
 239                 return 1;
 240         return 0;
 241 }
 242
 243 static inline int ext3_should_order_data(struct inode *inode)
 244 {
 245         if (!S_ISREG(inode->i_mode))
 246                 return 0;
 247         if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
 248                 return 0;
 249         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 250                 return 1;
 251         return 0;
 252 }
 253
 254 static inline int ext3_should_writeback_data(struct inode *inode)
 255 {
 256         if (!S_ISREG(inode->i_mode))
 257                 return 0;
 258         if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
 259                 return 0;
 260         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 261                 return 1;
 262         return 0;
 263 }
 264
 265 #endif  /* _LINUX_EXT3_JBD_H */