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ceph: kick cap flushes before sending other cap message 

If ceph_check_caps() wants to send cap message to a recovering MDS,
make sure it kicks cap flushes first.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-07-07 18:34:45 +08:00 committed by Ilya Dryomov
parent 70220ac8c2
commit 7bc00fddb9
1 changed files with 34 additions and 9 deletions
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43
fs/ceph/caps.c
View File

@ -41,6 +41,10 @@
*/
static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);
static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_inode_info *ci,
u64 oldest_flush_tid);
/*
* Generate readable cap strings for debugging output.
@ -1563,11 +1567,6 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
if (ci->i_ceph_flags & CEPH_I_FLUSH)
flags |= CHECK_CAPS_FLUSH;
/* flush snaps first time around only */
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
__ceph_flush_snaps(ci, &session);
ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
}
goto retry_locked;
retry:
spin_lock(&ci->i_ceph_lock);
@ -1688,10 +1687,15 @@ retry_locked:
}
}
/* flush anything dirty? */
if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
ci->i_dirty_caps) {
dout("flushing dirty caps\n");
goto ack;
if (cap == ci->i_auth_cap) {
if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
dout("flushing dirty caps\n");
goto ack;
}
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
dout("flushing snap caps\n");
goto ack;
}
}
/* completed revocation? going down and there are no caps? */
@ -1750,6 +1754,27 @@ ack:
goto retry;
}
}
/* kick flushing and flush snaps before sending normal
* cap message */
if (cap == ci->i_auth_cap &&
(ci->i_ceph_flags &
(CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
spin_lock(&mdsc->cap_dirty_lock);
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
spin_unlock(&mdsc->cap_dirty_lock);
__kick_flushing_caps(mdsc, session, ci,
oldest_flush_tid);
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
}
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
__ceph_flush_snaps(ci, &session);
ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
}
goto retry_locked;
}
/* take snap_rwsem after session mutex */
if (!took_snap_rwsem) {
if (down_read_trylock(&mdsc->snap_rwsem) == 0) {