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ceph: eliminate session->s_trim_caps

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It's only used to keep count of caps being trimmed, but that requires
that we hold the session->s_mutex to prevent multiple trimming
operations from running concurrently.

We can achieve the same effect using an integer on the stack, which
allows us to (eventually) not need the s_mutex.

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 2019-07-19 15:22:28 -04:00 committed by Ilya Dryomov
parent 606d102327
commit 533a2818dd
2 changed files with 9 additions and 10 deletions
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17
fs/ceph/mds_client.c
View File

@ -639,7 +639,6 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
s->s_renew_seq = 0;
INIT_LIST_HEAD(&s->s_caps);
s->s_nr_caps = 0;
s->s_trim_caps = 0;
refcount_set(&s->s_ref, 1);
INIT_LIST_HEAD(&s->s_waiting);
INIT_LIST_HEAD(&s->s_unsafe);
@ -1722,11 +1721,11 @@ out:
*/
static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
{
struct ceph_mds_session *session = arg;
int *remaining = arg;
struct ceph_inode_info *ci = ceph_inode(inode);
int used, wanted, oissued, mine;
if (session->s_trim_caps <= 0)
if (*remaining <= 0)
return -1;
spin_lock(&ci->i_ceph_lock);
@ -1763,7 +1762,7 @@ static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
if (oissued) {
/* we aren't the only cap.. just remove us */
__ceph_remove_cap(cap, true);
session->s_trim_caps--;
(*remaining)--;
} else {
struct dentry *dentry;
/* try dropping referring dentries */
@ -1775,7 +1774,7 @@ static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
d_prune_aliases(inode);
count = atomic_read(&inode->i_count);
if (count == 1)
session->s_trim_caps--;
(*remaining)--;
dout("trim_caps_cb %p cap %p pruned, count now %d\n",
inode, cap, count);
} else {
@ -1801,12 +1800,12 @@ int ceph_trim_caps(struct ceph_mds_client *mdsc,
dout("trim_caps mds%d start: %d / %d, trim %d\n",
session->s_mds, session->s_nr_caps, max_caps, trim_caps);
if (trim_caps > 0) {
session->s_trim_caps = trim_caps;
ceph_iterate_session_caps(session, trim_caps_cb, session);
int remaining = trim_caps;
ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
session->s_mds, session->s_nr_caps, max_caps,
trim_caps - session->s_trim_caps);
session->s_trim_caps = 0;
trim_caps - remaining);
}
ceph_flush_cap_releases(mdsc, session);

2
fs/ceph/mds_client.h
View File

@ -176,7 +176,7 @@ struct ceph_mds_session {
spinlock_t s_cap_lock;
struct list_head s_caps; /* all caps issued by this session */
struct ceph_cap *s_cap_iterator;
int s_nr_caps, s_trim_caps;
int s_nr_caps;
int s_num_cap_releases;
int s_cap_reconnect;
int s_readonly;