Commit 5b3248c6 authored by Xiubo Li's avatar Xiubo Li Committed by Ilya Dryomov
Browse files

ceph: rename get_session and switch to use ceph_get_mds_session 



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: default avatarXiubo Li <xiubli@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 4fbc0c71

fs/ceph/mds_client.c

+8 −8
Original line number Diff line number Diff line
@@ -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;

}

fs/ceph/mds_client.h

+2 −7
Original line number Diff line number Diff line
@@ -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,

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