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| author | Yan, Zheng <zheng.z.yan@intel.com> | 2013-07-02 12:40:19 +0800 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2013-07-03 15:32:56 -0700 |
| commit | b415bf4f9fe25f39934f5c464125e4a2dffb6d08 (patch) | |
| tree | f38df9c1746a1419e7942afb4534625175a5d353 /fs/ceph/file.c | |
| parent | 5446429630257f4723829409337a26c076907d5d (diff) | |
| download | op-kernel-dev-b415bf4f9fe25f39934f5c464125e4a2dffb6d08.zip op-kernel-dev-b415bf4f9fe25f39934f5c464125e4a2dffb6d08.tar.gz | |
ceph: fix pending vmtruncate race
The locking order for pending vmtruncate is wrong, it can lead to
following race:
write wmtruncate work
------------------------ ----------------------
lock i_mutex
check i_truncate_pending check i_truncate_pending
truncate_inode_pages() lock i_mutex (blocked)
copy data to page cache
unlock i_mutex
truncate_inode_pages()
The fix is take i_mutex before calling __ceph_do_pending_vmtruncate()
Fixes: http://tracker.ceph.com/issues/5453
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Diffstat (limited to 'fs/ceph/file.c')
| -rw-r--r-- | fs/ceph/file.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 7c69f4f..a44d515 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -822,7 +822,7 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) int ret; mutex_lock(&inode->i_mutex); - __ceph_do_pending_vmtruncate(inode, false); + __ceph_do_pending_vmtruncate(inode); if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); |
