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mds: check cap ID when handling cap export message

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handle following sequence of events:
- mds0 exports an inode to mds1. client receives the cap import
  message from mds1. caps from mds0 are removed while handling
  the cap import message.
- mds1 exports an inode to mds0. client receives the cap export
  message from mds1. handle_cap_export() adds placeholder caps
  for mds0
- client receives the first cap export message (for exporting
  inode from mds0 to mds1)

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng 2014-04-21 15:46:37 +08:00
parent 8d08503c13
commit ca665e0282
1 changed files with 1 additions and 1 deletions
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2
fs/ceph/caps.c
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@ -2805,7 +2805,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
retry:
spin_lock(&ci->i_ceph_lock);
cap = __get_cap_for_mds(ci, mds);
if (!cap)
if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
goto out_unlock;
if (target < 0) {