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ocfs2: Fix lock inversion in quotas during umount 

We cannot cancel delayed work from ocfs2_local_free_info because that is called
with dqonoff_mutex held and the work it cancels requires dqonoff_mutex to
finish. Cancel the work before acquiring dqonoff_mutex.

Acked-by: Joel Becker <Joel.Becker@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2010-05-13 22:14:53 +02:00
parent 52a9ee281c
commit c06bcbfa1e
2 changed files with 4 additions and 4 deletions
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4
fs/ocfs2/quota_local.c
View File

@ -816,10 +816,6 @@ static int ocfs2_local_free_info(struct super_block *sb, int type)
int mark_clean = 1, len;
int status;
/* At this point we know there are no more dquots and thus
* even if there's some sync in the pdflush queue, it won't
* find any dquots and return without doing anything */
cancel_delayed_work_sync(&oinfo->dqi_sync_work);
iput(oinfo->dqi_gqinode);
ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
ocfs2_lock_res_free(&oinfo->dqi_gqlock);

4
fs/ocfs2/super.c
View File

@ -938,12 +938,16 @@ static void ocfs2_disable_quotas(struct ocfs2_super *osb)
int type;
struct inode *inode;
struct super_block *sb = osb->sb;
struct ocfs2_mem_dqinfo *oinfo;
/* We mostly ignore errors in this function because there's not much
* we can do when we see them */
for (type = 0; type < MAXQUOTAS; type++) {
if (!sb_has_quota_loaded(sb, type))
continue;
/* Cancel periodic syncing before we grab dqonoff_mutex */
oinfo = sb_dqinfo(sb, type)->dqi_priv;
cancel_delayed_work_sync(&oinfo->dqi_sync_work);
inode = igrab(sb->s_dquot.files[type]);
/* Turn off quotas. This will remove all dquot structures from
* memory and so they will be automatically synced to global