On Fri, Aug 17, 2012 at 08:47:04AM +0200, Marco Stornelli wrote:
> Great. I'll remove the calls for ext3/ext4 when I'll submit the
> second version of the patch.
FYI, I have the following patch my ext4 tree, so I could do more
intensive testing. I'll let folks know if anything goes horribly
wrong, but I'm pretty sure this should be safe.
- Ted
>From 81f74e743344217487792e4190f9478963d1bb21 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Fri, 17 Aug 2012 19:00:34 -0400
Subject: [PATCH] ext4: drop lock_super()/unlock_super()
We don't need lock_super()/unlock_super() any more, since the places
where it is used, we are protected by the s_umount r/w semaphore.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Marco Stornelli <marco.stornelli@xxxxxxxxx>
---
fs/ext4/super.c | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 3ab798d..bae4124 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -861,7 +861,6 @@ static void ext4_put_super(struct super_block *sb)
flush_workqueue(sbi->dio_unwritten_wq);
destroy_workqueue(sbi->dio_unwritten_wq);
- lock_super(sb);
if (sbi->s_journal) {
err = jbd2_journal_destroy(sbi->s_journal);
sbi->s_journal = NULL;
@@ -928,7 +927,6 @@ static void ext4_put_super(struct super_block *sb)
* Now that we are completely done shutting down the
* superblock, we need to actually destroy the kobject.
*/
- unlock_super(sb);
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
if (sbi->s_chksum_driver)
@@ -4535,11 +4533,9 @@ static int ext4_unfreeze(struct super_block *sb)
if (sb->s_flags & MS_RDONLY)
return 0;
- lock_super(sb);
/* Reset the needs_recovery flag before the fs is unlocked. */
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ext4_commit_super(sb, 1);
- unlock_super(sb);
return 0;
}
@@ -4575,7 +4571,6 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
char *orig_data = kstrdup(data, GFP_KERNEL);
/* Store the original options */
- lock_super(sb);
old_sb_flags = sb->s_flags;
old_opts.s_mount_opt = sbi->s_mount_opt;
old_opts.s_mount_opt2 = sbi->s_mount_opt2;
@@ -4717,7 +4712,6 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
if (sbi->s_journal == NULL)
ext4_commit_super(sb, 1);
- unlock_super(sb);
#ifdef CONFIG_QUOTA
/* Release old quota file names */
for (i = 0; i < MAXQUOTAS; i++)
@@ -4730,10 +4724,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
EXT4_FEATURE_RO_COMPAT_QUOTA)) {
err = ext4_enable_quotas(sb);
- if (err) {
- lock_super(sb);
+ if (err)
goto restore_opts;
- }
}
}
#endif
@@ -4760,7 +4752,6 @@ restore_opts:
sbi->s_qf_names[i] = old_opts.s_qf_names[i];
}
#endif
- unlock_super(sb);
kfree(orig_data);
return err;
}
--
1.7.12.rc0.22.gcdd159b
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