ceph: simplify caps revocation, fix for multimds
The caps revocation should either initiate writeback, invalidateion, or
call check_caps to ack or do the dirty work. The primary question is
whether we can get away with only checking the auth cap or whether all
caps need to be checked.
The old code was doing...something else. At the very least, revocations
from non-auth MDSs could break by triggering the "check auth cap only"
case.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index a5b5725..82ffde6 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2278,8 +2278,8 @@
* try to invalidate (once). (If there are dirty buffers, we
* will invalidate _after_ writeback.)
*/
- if (((cap->issued & ~newcaps) & (CEPH_CAP_FILE_CACHE|
- CEPH_CAP_FILE_LAZYIO)) &&
+ if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
+ (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
!ci->i_wrbuffer_ref) {
if (try_nonblocking_invalidate(inode) == 0) {
revoked_rdcache = 1;
@@ -2371,16 +2371,22 @@
/* revocation, grant, or no-op? */
if (cap->issued & ~newcaps) {
- dout("revocation: %s -> %s\n", ceph_cap_string(cap->issued),
- ceph_cap_string(newcaps));
- if ((used & ~newcaps) & CEPH_CAP_FILE_BUFFER)
- writeback = 1; /* will delay ack */
- else if (dirty & ~newcaps)
- check_caps = 1; /* initiate writeback in check_caps */
- else if (((used & ~newcaps) & (CEPH_CAP_FILE_CACHE|
- CEPH_CAP_FILE_LAZYIO)) == 0 ||
- revoked_rdcache)
- check_caps = 2; /* send revoke ack in check_caps */
+ int revoking = cap->issued & ~newcaps;
+
+ dout("revocation: %s -> %s (revoking %s)\n",
+ ceph_cap_string(cap->issued),
+ ceph_cap_string(newcaps),
+ ceph_cap_string(revoking));
+ if (revoking & CEPH_CAP_FILE_BUFFER)
+ writeback = 1; /* initiate writeback; will delay ack */
+ else if (revoking == CEPH_CAP_FILE_CACHE &&
+ (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
+ queue_invalidate)
+ ; /* do nothing yet, invalidation will be queued */
+ else if (cap == ci->i_auth_cap)
+ check_caps = 1; /* check auth cap only */
+ else
+ check_caps = 2; /* check all caps */
cap->issued = newcaps;
cap->implemented |= newcaps;
} else if (cap->issued == newcaps) {