LXR linux/include/linux/ext3

   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(sb)      (EXT3_SINGLEDATA_TRANS_BLOCKS + \
  46                                         EXT3_XATTR_TRANS_BLOCKS - 2 + \
  47                                         EXT3_MAXQUOTAS_TRANS_BLOCKS(sb))
  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(sb)   (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 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(sb) (test_opt(sb, QUOTA) ? 2 : 0)
  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(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
  81                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
  82#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
  83                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
  84#else
  85#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
  86#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
  87#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
  88#endif
  89#define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb))
  90#define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb))
  91#define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb))
  92
  93int
  94ext3_mark_iloc_dirty(handle_t *handle,
  95                     struct inode *inode,
  96                     struct ext3_iloc *iloc);
  97
  98/*
  99 * On success, We end up with an outstanding reference count against
 100 * iloc->bh.  This _must_ be cleaned up later.
 101 */
 102
 103int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
 104                        struct ext3_iloc *iloc);
 105
 106int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
 107
 108/*
 109 * Wrapper functions with which ext3 calls into JBD.  The intent here is
 110 * to allow these to be turned into appropriate stubs so ext3 can control
 111 * ext2 filesystems, so ext2+ext3 systems only nee one fs.  This work hasn't
 112 * been done yet.
 113 */
 114
 115static inline void ext3_journal_release_buffer(handle_t *handle,
 116                                                struct buffer_head *bh)
 117{
 118        journal_release_buffer(handle, bh);
 119}
 120
 121void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 122                struct buffer_head *bh, handle_t *handle, int err);
 123
 124int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
 125                                struct buffer_head *bh);
 126
 127int __ext3_journal_get_write_access(const char *where, handle_t *handle,
 128                                struct buffer_head *bh);
 129
 130int __ext3_journal_forget(const char *where, handle_t *handle,
 131                                struct buffer_head *bh);
 132
 133int __ext3_journal_revoke(const char *where, handle_t *handle,
 134                                unsigned long blocknr, struct buffer_head *bh);
 135
 136int __ext3_journal_get_create_access(const char *where,
 137                                handle_t *handle, struct buffer_head *bh);
 138
 139int __ext3_journal_dirty_metadata(const char *where,
 140                                handle_t *handle, struct buffer_head *bh);
 141
 142#define ext3_journal_get_undo_access(handle, bh) \
 143        __ext3_journal_get_undo_access(__func__, (handle), (bh))
 144#define ext3_journal_get_write_access(handle, bh) \
 145        __ext3_journal_get_write_access(__func__, (handle), (bh))
 146#define ext3_journal_revoke(handle, blocknr, bh) \
 147        __ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
 148#define ext3_journal_get_create_access(handle, bh) \
 149        __ext3_journal_get_create_access(__func__, (handle), (bh))
 150#define ext3_journal_dirty_metadata(handle, bh) \
 151        __ext3_journal_dirty_metadata(__func__, (handle), (bh))
 152#define ext3_journal_forget(handle, bh) \
 153        __ext3_journal_forget(__func__, (handle), (bh))
 154
 155int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
 156
 157handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
 158int __ext3_journal_stop(const char *where, handle_t *handle);
 159
 160static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
 161{
 162        return ext3_journal_start_sb(inode->i_sb, nblocks);
 163}
 164
 165#define ext3_journal_stop(handle) \
 166        __ext3_journal_stop(__func__, (handle))
 167
 168static inline handle_t *ext3_journal_current_handle(void)
 169{
 170        return journal_current_handle();
 171}
 172
 173static inline int ext3_journal_extend(handle_t *handle, int nblocks)
 174{
 175        return journal_extend(handle, nblocks);
 176}
 177
 178static inline int ext3_journal_restart(handle_t *handle, int nblocks)
 179{
 180        return journal_restart(handle, nblocks);
 181}
 182
 183static inline int ext3_journal_blocks_per_page(struct inode *inode)
 184{
 185        return journal_blocks_per_page(inode);
 186}
 187
 188static inline int ext3_journal_force_commit(journal_t *journal)
 189{
 190        return journal_force_commit(journal);
 191}
 192
 193/* super.c */
 194int ext3_force_commit(struct super_block *sb);
 195
 196static inline int ext3_should_journal_data(struct inode *inode)
 197{
 198        if (!S_ISREG(inode->i_mode))
 199                return 1;
 200        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 201                return 1;
 202        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
 203                return 1;
 204        return 0;
 205}
 206
 207static inline int ext3_should_order_data(struct inode *inode)
 208{
 209        if (!S_ISREG(inode->i_mode))
 210                return 0;
 211        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
 212                return 0;
 213        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 214                return 1;
 215        return 0;
 216}
 217
 218static inline int ext3_should_writeback_data(struct inode *inode)
 219{
 220        if (!S_ISREG(inode->i_mode))
 221                return 0;
 222        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
 223                return 0;
 224        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 225                return 1;
 226        return 0;
 227}
 228
 229#endif  /* _LINUX_EXT3_JBD_H */
 230