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authorTheodore Ts'o <tytso@mit.edu>2010-06-11 23:14:04 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-06-11 23:14:04 -0400
commita0375156ca1041574b5d47cc7e32f10b891151b0 (patch)
treeb791961012b9348f289c3dda5dc071bdf9b736d2 /fs/ext4/resize.c
parent7e27d6e778cd87b6f2415515d7127eba53fe5d02 (diff)
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/resize.c')
-rw-r--r--fs/ext4/resize.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 6df797eb9ae..27527ae466e 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -921,8 +921,7 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
&sbi->s_flex_groups[flex_group].free_inodes);
}
- ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh);
- sb->s_dirt = 1;
+ ext4_handle_dirty_super(handle, sb);
exit_journal:
mutex_unlock(&sbi->s_resize_lock);
@@ -1045,13 +1044,12 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
goto exit_put;
}
ext4_blocks_count_set(es, o_blocks_count + add);
- ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh);
- sb->s_dirt = 1;
mutex_unlock(&EXT4_SB(sb)->s_resize_lock);
ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
o_blocks_count + add);
/* We add the blocks to the bitmap and set the group need init bit */
ext4_add_groupblocks(handle, sb, o_blocks_count, add);
+ ext4_handle_dirty_super(handle, sb);
ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
o_blocks_count + add);
if ((err = ext4_journal_stop(handle)))