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| author | Yan, Zheng <zyan@redhat.com> | 2019-01-31 09:55:51 +0100 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2019-03-05 18:55:17 +0100 |
| commit | 37c4efc1ddf98ba8b234d116d863a9464445901e (patch) | |
| tree | 8eae1cafdd6f7be9fef1844375f41cc23b75a912 /fs/ceph/mds_client.h | |
| parent | ceph: delete stale dentry when last reference is dropped (diff) | |
| download | linux-37c4efc1ddf98ba8b234d116d863a9464445901e.tar.xz linux-37c4efc1ddf98ba8b234d116d863a9464445901e.zip | |
ceph: periodically trim stale dentries
Previous commit make VFS delete stale dentry when last reference is
dropped. Lease also can become invalid when corresponding dentry has
no reference. This patch make cephfs periodically scan lease list,
delete corresponding dentry if lease is invalid.
There are two types of lease, dentry lease and dir lease. dentry lease
has life time and applies to singe dentry. Dentry lease is added to tail
of a list when it's updated, leases at front of the list will expire
first. Dir lease is CEPH_CAP_FILE_SHARED on directory inode, it applies
to all dentries in the directory. Dentries have dir leases are added to
another list. Dentries in the list are periodically checked in a round
robin manner.
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-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 | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 2147ecd0c9e5..580b235f343b 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -378,6 +378,8 @@ struct ceph_mds_client { spinlock_t cap_dirty_lock; /* protects above items */ wait_queue_head_t cap_flushing_wq; + struct work_struct cap_reclaim_work; + /* * Cap reservations * @@ -398,9 +400,9 @@ struct ceph_mds_client { int caps_avail_count; /* unused, unreserved */ int caps_min_count; /* keep at least this many (unreserved) */ - spinlock_t dentry_lru_lock; - struct list_head dentry_lru; - int num_dentry; + spinlock_t dentry_list_lock; + struct list_head dentry_leases; /* fifo list */ + struct list_head dentry_dir_leases; /* lru list */ spinlock_t snapid_map_lock; struct rb_root snapid_map_tree; @@ -462,6 +464,7 @@ extern void __ceph_queue_cap_release(struct ceph_mds_session *session, struct ceph_cap *cap); extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc, struct ceph_mds_session *session); +extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc); extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, |