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authorYan, Zheng <zyan@redhat.com>2017-12-14 15:11:09 +0800
committerIlya Dryomov <idryomov@gmail.com>2019-03-05 18:55:16 +0100
commit75c9627efb7288e1725e9903ea275cc6b5992f17 (patch)
tree065ca7fbb792935029bc5c94875ead92cca81b9e /fs/ceph/mds_client.h
parent81c5a1487e52a316e5e7d79e9911376648a79e85 (diff)
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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.h13
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;