[PATCH 13/49] ext4: ext4_mark_recovery_complete() doesn't need to use lock_super

Theodore Ts'o
2009-06-08T19:34:45Z

The function ext4_mark_recovery_complete() is called from two call
paths: either (a) while mounting the filesystem, in which case there's
no danger of any other CPU calling write_super() until the mount is
completed, and (b) while remounting the filesystem read-write, in
which case the fs core has already locked the superblock. This also
allows us to take out a very vile unlock_super()/lock_super() pair in
ext4_remount().

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
fs/ext4/super.c | 11 +----------
1 files changed, 1 insertions(+), 10 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e3b35f2..45d0ada 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3219,13 +3219,11 @@ static void ext4_mark_recovery_complete(struct super_block *sb,
if (jbd2_journal_flush(journal) < 0)
goto out;

- lock_super(sb);
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
sb->s_flags & MS_RDONLY) {
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ext4_commit_super(sb, 1);
}
- unlock_super(sb);

out:
jbd2_journal_unlock_updates(journal);
@@ -3436,15 +3434,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
(sbi->s_mount_state & EXT4_VALID_FS))
es->s_state = cpu_to_le16(sbi->s_mount_state);

- /*
- * We have to unlock super so that we can wait for
- * transactions.
- */
- if (sbi->s_journal) {
- unlock_super(sb);
+ if (sbi->s_journal)
ext4_mark_recovery_complete(sb, es);
- lock_super(sb);
- }
} else {
int ret;
if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
--
1.6.3.2.1.gb9f7d.dirty