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ceph: introduce global empty snap context

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Current snaphost code does not properly handle moving inode from one
empty snap realm to another empty snap realm. After changing inode's
snap realm, some dirty pages' snap context can be not equal to inode's
i_head_snap. This can trigger BUG() in ceph_put_wrbuffer_cap_refs()

The fix is introduce a global empty snap context for all empty snap
realm. This avoids triggering the BUG() for filesystem with no snapshot.

Fixes: http://tracker.ceph.com/issues/9928

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@redhat.com>
This commit is contained in:
Yan, Zheng
2014-11-06 15:09:41 +08:00
committed by Ilya Dryomov
parent 7cfa0313d0
commit 97c85a828f
3 changed files with 35 additions and 3 deletions
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10
fs/ceph/super.c
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@@ -1028,15 +1028,20 @@ static int __init init_ceph(void)
ceph_flock_init();
ceph_xattr_init();
ret = ceph_snap_init();
if (ret)
goto out_xattr;
ret = register_filesystem(&ceph_fs_type);
if (ret)
goto out_icache;
goto out_snap;
pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
return 0;
out_icache:
out_snap:
ceph_snap_exit();
out_xattr:
ceph_xattr_exit();
destroy_caches();
out:
@@ -1047,6 +1052,7 @@ static void __exit exit_ceph(void)
{
dout("exit_ceph\n");
unregister_filesystem(&ceph_fs_type);
ceph_snap_exit();
ceph_xattr_exit();
destroy_caches();
}