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authorSage Weil <sage@newdream.net>2010-08-05 13:53:18 -0700
committerSage Weil <sage@newdream.net>2010-08-05 13:53:40 -0700
commit0eb6cd49f6e3ec523787d09cf08d3179be270db4 (patch)
tree7974963003e0b8ef26fdfb3a8120c6b4b588a01b /fs/ceph
parente9d177443134bc4ac1c1393af69e2a8704bcac09 (diff)
ceph: only queue async writeback on cap revocation if there is dirty data
Normally, if the Fb cap bit is being revoked, we queue an async writeback. If there is no dirty data but we still hold the cap, this leaves the client sitting around doing nothing until the cap timeouts expire and the cap is released on its own (as it would have been without the revocation). Instead, only queue writeback if the bit is actually used (i.e., we have dirty data). If not, we can reply to the revocation immediately. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/caps.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 51546d54b841..7bf182b03973 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2384,7 +2384,7 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
ceph_cap_string(cap->issued),
ceph_cap_string(newcaps),
ceph_cap_string(revoking));
- if (revoking & CEPH_CAP_FILE_BUFFER)
+ if (revoking & used & CEPH_CAP_FILE_BUFFER)
writeback = 1; /* initiate writeback; will delay ack */
else if (revoking == CEPH_CAP_FILE_CACHE &&
(newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&