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ceph: track pending caps flushing accurately

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Previously we do not trace accurate TID for flushing caps. when
MDS failovers, we have no choice but to re-send all flushing caps
with a new TID. This can cause problem because MDS can has already
flushed some caps and has issued the same caps to other client.
The re-sent cap flush has a new TID, which makes MDS unable to
detect if it has already processed the cap flush.

This patch adds code to track pending caps flushing accurately.
When re-sending cap flush is needed, we use its original flush
TID.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2015-06-09 15:48:57 +08:00
committed by Ilya Dryomov
parent 6c13a6bb55
commit 553adfd941
5 changed files with 192 additions and 88 deletions
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1
fs/ceph/mds_client.h
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@@ -307,6 +307,7 @@ struct ceph_mds_client {
spinlock_t snap_flush_lock;
u64 cap_flush_seq;
u64 last_cap_flush_tid;
struct list_head cap_dirty; /* inodes with dirty caps */
struct list_head cap_dirty_migrating; /* ...that are migration... */
int num_cap_flushing; /* # caps we are flushing */