ceph: only queue capsnap if caps are dirty

We used to go into this branch if i_wrbuffer_ref_head was non-zero.  This
was an ancient check from before we were careful about dealing with all
kinds of caps (and not just dirty pages).  It is cleaner to only queue a
capsnap if there is an actual dirty cap.  If we are racing with...
something...we will end up here with ci->i_wrbuffer_refs but no dirty
caps.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 2 insertions, 4 deletions

diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index ac030c9d9959..e26437191333 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -465,9 +465,8 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
                    cap_snap.  lucky us. */
                 dout("queue_cap_snap %p already pending\n", inode);
                 kfree(capsnap);
-        } else if (ci->i_wrbuffer_ref_head ||
-                   (dirty & (CEPH_CAP_AUTH_EXCL|CEPH_CAP_XATTR_EXCL|
-                             CEPH_CAP_FILE_EXCL|CEPH_CAP_FILE_WR))) {
+        } else if (dirty & (CEPH_CAP_AUTH_EXCL|CEPH_CAP_XATTR_EXCL|
+                            CEPH_CAP_FILE_EXCL|CEPH_CAP_FILE_WR)) {
                 struct ceph_snap_context *snapc = ci->i_head_snapc;
 
                 /*
@@ -480,7 +479,6 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
                 dout("queue_cap_snap %p cap_snap %p queuing under %p %s\n",
                      inode, capsnap, snapc, ceph_cap_string(dirty));
                 ihold(inode);
-                BUG_ON(dirty == 0);
 
                 atomic_set(&capsnap->nref, 1);
                 capsnap->ci = ci;