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author | alex chen <alex.chen@huawei.com> | 2015-04-14 15:43:49 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-14 16:48:58 -0700 |
commit | 2f2eca20a09dac0e9d62bf57ce6a0c6ef6cf91e6 (patch) | |
tree | 481e731e8379647344f431c7b72c7ac15f46b984 /fs | |
parent | 1543306e75ee40662b2c6d37c43c8659f3d6f880 (diff) | |
download | linux-2f2eca20a09dac0e9d62bf57ce6a0c6ef6cf91e6.tar.gz |
ocfs2: check if the ocfs2 lock resource has been initialized before calling ocfs2_dlm_lock
If ocfs2 lockres has not been initialized before calling ocfs2_dlm_lock, the lock won't be dropped and then will lead umount hung. The case is described below: ocfs2_mknod ocfs2_mknod_locked __ocfs2_mknod_locked ocfs2_journal_access_di Failed because of -ENOMEM or other reasons, the inode lockres has not been initialized yet. iput(inode) ocfs2_evict_inode ocfs2_delete_inode ocfs2_inode_lock ocfs2_inode_lock_full_nested __ocfs2_cluster_lock Succeeds and allocates a new dlm lockres. ocfs2_clear_inode ocfs2_open_unlock ocfs2_drop_inode_locks ocfs2_drop_lock Since lockres has not been initialized, the lock can't be dropped and the lockres can't be migrated, thus umount will hang forever. Signed-off-by: Alex Chen <alex.chen@huawei.com> Reviewed-by: Joseph Qi <joseph.qi@huawei.com> Reviewed-by: joyce.xue <xuejiufei@huawei.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ocfs2/dlmglue.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 23adcbf374d3..956edf67be20 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -1391,6 +1391,11 @@ static int __ocfs2_cluster_lock(struct ocfs2_super *osb, int noqueue_attempted = 0; int dlm_locked = 0; + if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { + mlog_errno(-EINVAL); + return -EINVAL; + } + ocfs2_init_mask_waiter(&mw); if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |