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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/mballoc.c
parent7e27d6e778cd87b6f2415515d7127eba53fe5d02 (diff)
downloadlwn-a0375156ca1041574b5d47cc7e32f10b891151b0.tar.gz
lwn-a0375156ca1041574b5d47cc7e32f10b891151b0.zip
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/mballoc.c')
-rw-r--r--fs/ext4/mballoc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 12b3bc026a68..d9d267181ddc 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2812,7 +2812,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh);
out_err:
- sb->s_dirt = 1;
+ ext4_mark_super_dirty(sb);
brelse(bitmap_bh);
return err;
}
@@ -4680,7 +4680,7 @@ do_more:
put_bh(bitmap_bh);
goto do_more;
}
- sb->s_dirt = 1;
+ ext4_mark_super_dirty(sb);
error_return:
if (freed)
dquot_free_block(inode, freed);