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| author | Yan, Zheng <zyan@redhat.com> | 2017-12-14 15:11:09 +0800 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2019-03-05 18:55:16 +0100 |
| commit | 75c9627efb7288e1725e9903ea275cc6b5992f17 (patch) | |
| tree | 065ca7fbb792935029bc5c94875ead92cca81b9e /fs/ceph/super.h | |
| parent | 81c5a1487e52a316e5e7d79e9911376648a79e85 (diff) | |
| download | lwn-75c9627efb7288e1725e9903ea275cc6b5992f17.tar.gz lwn-75c9627efb7288e1725e9903ea275cc6b5992f17.zip | |
ceph: map snapid to anonymous bdev ID
ceph_getattr() return zero dev ID for head inodes and set dev ID to
snapid directly for snaphost inodes. This is not good because userspace
utilities may consider device ID of 0 as invalid, snapid may conflict
with other device's ID.
This patch introduces "snapids to anonymous bdev IDs" map. we create a
new mapping when we see a snapid for the first time. we trim unused
mapping after it is ilde for 5 minutes.
Link: http://tracker.ceph.com/issues/22353
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/super.h')
| -rw-r--r-- | fs/ceph/super.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h index dfb64a5211b6..5b15ae91024a 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -370,7 +370,10 @@ struct ceph_inode_info { struct list_head i_unsafe_iops; /* uncommitted mds inode ops */ spinlock_t i_unsafe_lock; - struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ + union { + struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ + struct ceph_snapid_map *i_snapid_map; /* snapid -> dev_t */ + }; int i_snap_realm_counter; /* snap realm (if caps) */ struct list_head i_snap_realm_item; struct list_head i_snap_flush_item; @@ -837,6 +840,14 @@ extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, struct ceph_cap_snap *capsnap); extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); +extern struct ceph_snapid_map *ceph_get_snapid_map(struct ceph_mds_client *mdsc, + u64 snap); +extern void ceph_put_snapid_map(struct ceph_mds_client* mdsc, + struct ceph_snapid_map *sm); +extern void ceph_trim_snapid_map(struct ceph_mds_client *mdsc); +extern void ceph_cleanup_snapid_map(struct ceph_mds_client *mdsc); + + /* * a cap_snap is "pending" if it is still awaiting an in-progress * sync write (that may/may not still update size, mtime, etc.). |