ceph: drop CAP_LINK_SHARED when sending "link" request to MDS

To handle "link" request, the MDS need to xlock inode's linklock,
which requires revoking any CAP_LINK_SHARED.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index f02d82b7933e..0e4da4a9c213 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -796,6 +796,8 @@ static int ceph_link(struct dentry *old_dentry, struct inode *dir,
         req->r_locked_dir = dir;
         req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
         req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
+        /* release LINK_SHARED on source inode (mds will lock it) */
+        req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
         err = ceph_mdsc_do_request(mdsc, dir, req);
         if (err) {
                 d_drop(dentry);