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ceph: add mount option to limit caps count

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If number of caps exceed the limit, ceph_trim_dentires() also trim
dentries with valid leases. Trimming dentry releases references to
associated inode, which may evict inode and release caps.

By default, there is no limit for caps count.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng
2019-02-01 14:57:15 +08:00
committed by Ilya Dryomov
parent 37c4efc1dd
commit fe33032daa
8 changed files with 91 additions and 21 deletions
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34
fs/ceph/mds_client.c
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@@ -1965,6 +1965,18 @@ void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
}
}
void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
{
int val;
if (!nr)
return;
val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
if (!(val % CEPH_CAPS_PER_RELEASE)) {
atomic_set(&mdsc->cap_reclaim_pending, 0);
ceph_queue_cap_reclaim_work(mdsc);
}
}
/*
* requests
*/
@@ -2878,7 +2890,6 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
req->r_op == CEPH_MDS_OP_LSSNAP))
ceph_readdir_prepopulate(req, req->r_session);
ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
}
current->journal_info = NULL;
mutex_unlock(&req->r_fill_mutex);
@@ -2887,12 +2898,18 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
if (realm)
ceph_put_snap_realm(mdsc, realm);
if (err == 0 && req->r_target_inode &&
test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
spin_lock(&ci->i_unsafe_lock);
list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
spin_unlock(&ci->i_unsafe_lock);
if (err == 0) {
if (req->r_target_inode &&
test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
struct ceph_inode_info *ci =
ceph_inode(req->r_target_inode);
spin_lock(&ci->i_unsafe_lock);
list_add_tail(&req->r_unsafe_target_item,
&ci->i_unsafe_iops);
spin_unlock(&ci->i_unsafe_lock);
}
ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
}
out_err:
mutex_lock(&mdsc->mutex);
@@ -4083,13 +4100,14 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
spin_lock_init(&mdsc->cap_dirty_lock);
init_waitqueue_head(&mdsc->cap_flushing_wq);
INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
atomic_set(&mdsc->cap_reclaim_pending, 0);
spin_lock_init(&mdsc->dentry_list_lock);
INIT_LIST_HEAD(&mdsc->dentry_leases);
INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
ceph_caps_init(mdsc);
ceph_adjust_min_caps(mdsc, fsc->min_caps);
ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
spin_lock_init(&mdsc->snapid_map_lock);
mdsc->snapid_map_tree = RB_ROOT;