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| author | Yan, Zheng <zyan@redhat.com> | 2017-12-14 10:11:09 +0300 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2019-03-05 20:55:16 +0300 |
| commit | 75c9627efb7288e1725e9903ea275cc6b5992f17 (patch) | |
| tree | 065ca7fbb792935029bc5c94875ead92cca81b9e /fs/ceph/mds_client.h | |
| parent | 81c5a1487e52a316e5e7d79e9911376648a79e85 (diff) | |
| download | linux-75c9627efb7288e1725e9903ea275cc6b5992f17.tar.xz | |
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/mds_client.h')
| -rw-r--r-- | fs/ceph/mds_client.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 4f962642fee4..d3a5c4046316 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -313,6 +313,15 @@ struct ceph_pool_perm { char pool_ns[]; }; +struct ceph_snapid_map { + struct rb_node node; + struct list_head lru; + atomic_t ref; + u64 snap; + dev_t dev; + unsigned long last_used; +}; + /* * mds client state */ @@ -390,6 +399,10 @@ struct ceph_mds_client { struct list_head dentry_lru; int num_dentry; + spinlock_t snapid_map_lock; + struct rb_root snapid_map_tree; + struct list_head snapid_map_lru; + struct rw_semaphore pool_perm_rwsem; struct rb_root pool_perm_tree; |