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authorJan Kara <jack@suse.cz>2009-06-02 12:24:02 (GMT)
committerJoel Becker <joel.becker@oracle.com>2009-06-04 02:14:30 (GMT)
commit80d73f15d12f087f3fe074f8a4d6e5c5624f2b47 (patch)
treee0f290b644535b785431ff16a93f6b3eb76d5359 /fs/ocfs2
parent65bac575e35915801ea518b9d8d8824367d125c8 (diff)
downloadlinux-fsl-qoriq-80d73f15d12f087f3fe074f8a4d6e5c5624f2b47.tar.xz
ocfs2: Fix possible deadlock in quota recovery
In ocfs2_finish_quota_recovery() we acquired global quota file lock and started recovering local quota file. During this process we need to get quota structures, which calls ocfs2_dquot_acquire() which gets global quota file lock again. This second lock can block in case some other node has requested the quota file lock in the mean time. Fix the problem by moving quota file locking down into the function where it is really needed. Then dqget() or dqput() won't be called with the lock held. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/quota_local.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index 71cf410..5a460fa 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -444,10 +444,6 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode,
mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
- status = ocfs2_lock_global_qf(oinfo, 1);
- if (status < 0)
- goto out;
-
list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
chunk = rchunk->rc_chunk;
hbh = NULL;
@@ -480,12 +476,18 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode,
type);
goto out_put_bh;
}
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_put_dquot;
+ }
+
handle = ocfs2_start_trans(OCFS2_SB(sb),
OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
- goto out_put_dquot;
+ goto out_drop_lock;
}
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
spin_lock(&dq_data_lock);
@@ -523,6 +525,8 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode,
out_commit:
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
+out_drop_lock:
+ ocfs2_unlock_global_qf(oinfo, 1);
out_put_dquot:
dqput(dquot);
out_put_bh:
@@ -537,8 +541,6 @@ out_put_bh:
if (status < 0)
break;
}
- ocfs2_unlock_global_qf(oinfo, 1);
-out:
if (status < 0)
free_recovery_list(&(rec->r_list[type]));
mlog_exit(status);