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ceph: fix queuing inode to mdsdir's snaprealm 

During MDS failovers, MClientSnap message may cause kclient to move
some inodes from root directory's snaprealm to mdsdir's snaprealm
and queue snapshots for these inodes. For a FS has never created any
snapshot, both root directory's snaprealm and mdsdir's snaprealm
share the same snapshot contexts (both are ceph_empty_snapc). This
confuses ceph_put_wrbuffer_cap_refs(), make it unable to distinguish
snapshot buffers from head buffers.

The fix is do not use ceph_empty_snapc as snaprealm's cached context.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
steinar/wifi_calib_4_9_kernel
Yan, Zheng 2015-07-20 10:14:06 +08:00 committed by Ilya Dryomov
parent 6893162215
commit 23078637e0
1 changed files with 0 additions and 7 deletions
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7
fs/ceph/snap.c
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@ -338,12 +338,6 @@ static int build_snap_context(struct ceph_snap_realm *realm)
return 0;
}
if (num == 0 && realm->seq == ceph_empty_snapc->seq) {
ceph_get_snap_context(ceph_empty_snapc);
snapc = ceph_empty_snapc;
goto done;
}
/* alloc new snap context */
err = -ENOMEM;
if (num > (SIZE_MAX - sizeof(*snapc)) / sizeof(u64))
@ -381,7 +375,6 @@ static int build_snap_context(struct ceph_snap_realm *realm)
realm->ino, realm, snapc, snapc->seq,
(unsigned int) snapc->num_snaps);
done:
ceph_put_snap_context(realm->cached_context);
realm->cached_context = snapc;
return 0;