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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/ext4_jbd2.c
parent7e27d6e778cd87b6f2415515d7127eba53fe5d02 (diff)
downloadlinux-linaro-stable-a0375156ca1041574b5d47cc7e32f10b891151b0.tar.gz
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_jbd2.c')
-rw-r--r--fs/ext4/ext4_jbd2.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index 53d2764d71ca..cfd27b38fa15 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -143,3 +143,19 @@ int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
}
return err;
}
+
+int __ext4_handle_dirty_super(const char *where, handle_t *handle,
+ struct super_block *sb)
+{
+ struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
+ int err = 0;
+
+ if (ext4_handle_valid(handle)) {
+ err = jbd2_journal_dirty_metadata(handle, bh);
+ if (err)
+ ext4_journal_abort_handle(where, __func__, bh,
+ handle, err);
+ } else
+ sb->s_dirt = 1;
+ return err;
+}