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ceph: make sure flushsnap messages are sent in proper order

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Before sending new flushsnap message, check if there are old
flushsnap messages that need to be re-sent. If there are, re-send
old messages first. This guarantees ordering of flushsnap messages.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2017-08-15 11:37:32 +08:00 committed by Ilya Dryomov
parent a5cd74ad38
commit 24d063acc2
1 changed files with 7 additions and 5 deletions
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12
fs/ceph/caps.c
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@ -1457,6 +1457,12 @@ retry:
goto retry;
}
// make sure flushsnap messages are sent in proper order.
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
__kick_flushing_caps(mdsc, session, ci, 0);
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
}
__ceph_flush_snaps(ci, session);
out:
spin_unlock(&ci->i_ceph_lock);
@ -1904,11 +1910,7 @@ ack:
(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);
__kick_flushing_caps(mdsc, session, ci, 0);
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
}
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)