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ceph: convert mdsc->cap_dirty to a per-session list

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This is a per-sb list now, but that makes it difficult to tell when
the cap is the last dirty one associated with the session. Switch
this to be a per-session list, but continue using the
mdsc->cap_dirty_lock to protect the lists.

This list is only ever walked in ceph_flush_dirty_caps, so change that
to walk the sessions array and then flush the caps for inodes on each
session's list.

If the auth cap ever changes while the inode has dirty caps, then
move the inode to the appropriate session for the new auth_cap. Also,
ensure that we never remove an auth cap while the inode is still on the
s_cap_dirty list.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton
2020-04-01 17:07:52 -04:00
committed by Ilya Dryomov
parent 6f05b30ea0
commit 1cf03a68e7
4 changed files with 85 additions and 19 deletions
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2
fs/ceph/mds_client.c
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@@ -755,6 +755,7 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
INIT_LIST_HEAD(&s->s_cap_releases);
INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
INIT_LIST_HEAD(&s->s_cap_dirty);
INIT_LIST_HEAD(&s->s_cap_flushing);
mdsc->sessions[mds] = s;
@@ -4373,7 +4374,6 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
spin_lock_init(&mdsc->snap_flush_lock);
mdsc->last_cap_flush_tid = 1;
INIT_LIST_HEAD(&mdsc->cap_flush_list);
INIT_LIST_HEAD(&mdsc->cap_dirty);
INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
mdsc->num_cap_flushing = 0;
spin_lock_init(&mdsc->cap_dirty_lock);