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| author | Theodore Ts'o <tytso@mit.edu> | 2010-06-12 07:14:04 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-06-12 07:14:04 +0400 |
| commit | a0375156ca1041574b5d47cc7e32f10b891151b0 (patch) | |
| tree | b791961012b9348f289c3dda5dc071bdf9b736d2 /fs/ext4/ext4.h | |
| parent | 7e27d6e778cd87b6f2415515d7127eba53fe5d02 (diff) | |
| download | linux-a0375156ca1041574b5d47cc7e32f10b891151b0.tar.xz | |
ext4: Clean up s_dirt handling
We don't need to set s_dirt in most of the ext4 code when journaling
is enabled. In ext3/4 some of the summary statistics for # of free
inodes, blocks, and directories are calculated from the per-block
group statistics when the file system is mounted or unmounted. As a
result the superblock doesn't have to be updated, either via the
journal or by setting s_dirt. There are a few exceptions, most
notably when resizing the file system, where the superblock needs to
be modified --- and in that case it should be done as a journalled
operation if possible, and s_dirt set only in no-journal mode.
This patch will optimize out some unneeded disk writes when using ext4
with a journal.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 19a4de57128a..8b56b53328eb 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1860,6 +1860,12 @@ static inline void ext4_unlock_group(struct super_block *sb, spin_unlock(ext4_group_lock_ptr(sb, group)); } +static inline void ext4_mark_super_dirty(struct super_block *sb) +{ + if (EXT4_SB(sb)->s_journal == NULL) + sb->s_dirt =1; +} + /* * Inodes and files operations */ |