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ceph: rename get_session and switch to use ceph_get_mds_session

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Just in case the session's refcount reach 0 and is releasing, and
if we get the session without checking it, we may encounter kernel
crash.

Rename get_session to ceph_get_mds_session and make it global.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2019-12-19 19:44:09 -05:00 committed by Ilya Dryomov
parent 4fbc0c711b
commit 5b3248c677
2 changed files with 10 additions and 15 deletions
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16
fs/ceph/mds_client.c
View File

@ -538,7 +538,7 @@ const char *ceph_session_state_name(int s)
}
}
static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
{
if (refcount_inc_not_zero(&s->s_ref)) {
dout("mdsc get_session %p %d -> %d\n", s,
@ -569,7 +569,7 @@ struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
{
if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
return NULL;
return get_session(mdsc->sessions[mds]);
return ceph_get_mds_session(mdsc->sessions[mds]);
}
static bool __have_session(struct ceph_mds_client *mdsc, int mds)
@ -1979,7 +1979,7 @@ void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
if (mdsc->stopping)
return;
get_session(session);
ceph_get_mds_session(session);
if (queue_work(mdsc->fsc->cap_wq,
&session->s_cap_release_work)) {
dout("cap release work queued\n");
@ -2615,7 +2615,7 @@ static void __do_request(struct ceph_mds_client *mdsc,
goto finish;
}
}
req->r_session = get_session(session);
req->r_session = ceph_get_mds_session(session);
dout("do_request mds%d session %p state %s\n", mds, session,
ceph_session_state_name(session->s_state));
@ -3139,7 +3139,7 @@ static void handle_session(struct ceph_mds_session *session,
mutex_lock(&mdsc->mutex);
if (op == CEPH_SESSION_CLOSE) {
get_session(session);
ceph_get_mds_session(session);
__unregister_session(mdsc, session);
}
/* FIXME: this ttl calculation is generous */
@ -3801,7 +3801,7 @@ static void check_new_map(struct ceph_mds_client *mdsc,
if (i >= newmap->possible_max_rank) {
/* force close session for stopped mds */
get_session(s);
ceph_get_mds_session(s);
__unregister_session(mdsc, s);
__wake_requests(mdsc, &s->s_waiting);
mutex_unlock(&mdsc->mutex);
@ -4402,7 +4402,7 @@ void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
mutex_lock(&mdsc->mutex);
for (i = 0; i < mdsc->max_sessions; i++) {
if (mdsc->sessions[i]) {
session = get_session(mdsc->sessions[i]);
session = ceph_get_mds_session(mdsc->sessions[i]);
__unregister_session(mdsc, session);
mutex_unlock(&mdsc->mutex);
mutex_lock(&session->s_mutex);
@ -4630,7 +4630,7 @@ static struct ceph_connection *con_get(struct ceph_connection *con)
{
struct ceph_mds_session *s = con->private;
if (get_session(s))
if (ceph_get_mds_session(s))
return con;
return NULL;
}

9
fs/ceph/mds_client.h
View File

@ -452,15 +452,10 @@ extern const char *ceph_mds_op_name(int op);
extern struct ceph_mds_session *
__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
static inline struct ceph_mds_session *
ceph_get_mds_session(struct ceph_mds_session *s)
{
refcount_inc(&s->s_ref);
return s;
}
extern const char *ceph_session_state_name(int s);
extern struct ceph_mds_session *
ceph_get_mds_session(struct ceph_mds_session *s);
extern void ceph_put_mds_session(struct ceph_mds_session *s);
extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,