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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/super.h | |
| parent | ceph: avoid accessing invalid memory (diff) | |
| download | linux-dev-b415bf4f9fe25f39934f5c464125e4a2dffb6d08.tar.xz linux-dev-b415bf4f9fe25f39934f5c464125e4a2dffb6d08.zip | |
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/super.h')
| -rw-r--r-- | fs/ceph/super.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h index dfbb729b3130..cbded572345e 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -692,7 +692,7 @@ extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, extern int ceph_inode_holds_cap(struct inode *inode, int mask); extern int ceph_inode_set_size(struct inode *inode, loff_t size); -extern void __ceph_do_pending_vmtruncate(struct inode *inode, bool needlock); +extern void __ceph_do_pending_vmtruncate(struct inode *inode); extern void ceph_queue_vmtruncate(struct inode *inode); extern void ceph_queue_invalidate(struct inode *inode); |