Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  rbd: fix safety of rbd_put_client()
  rbd: fix a memory leak in rbd_get_client()
  ceph: create a new session lock to avoid lock inversion
  ceph: fix length validation in parse_reply_info()
  ceph: initialize client debugfs outside of monc->mutex
  ceph: change "ceph.layout" xattr to be "ceph.file.layout"

drivers/block/rbd.c

@@ -380,6 +380,7 @@ static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr,
 	rbdc = __rbd_client_find(opt);
 	if (rbdc) {
 		ceph_destroy_options(opt);
+		kfree(rbd_opts);
 
 		/* using an existing client */
 		kref_get(&rbdc->kref);
@@ -406,15 +407,15 @@ static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr,
 
 /*
  * Destroy ceph client
+ *
+ * Caller must hold node_lock.
  */
 static void rbd_client_release(struct kref *kref)
 {
 	struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref);
 
 	dout("rbd_release_client %p\n", rbdc);
-	spin_lock(&node_lock);
 	list_del(&rbdc->node);
-	spin_unlock(&node_lock);
 
 	ceph_destroy_client(rbdc->client);
 	kfree(rbdc->rbd_opts);
@@ -427,7 +428,9 @@ static void rbd_client_release(struct kref *kref)
  */
 static void rbd_put_client(struct rbd_device *rbd_dev)
 {
+	spin_lock(&node_lock);
 	kref_put(&rbd_dev->rbd_client->kref, rbd_client_release);
+	spin_unlock(&node_lock);
 	rbd_dev->rbd_client = NULL;
 	rbd_dev->client = NULL;
 }

fs/ceph/caps.c

@@ -641,10 +641,10 @@ static int __cap_is_valid(struct ceph_cap *cap)
 	unsigned long ttl;
 	u32 gen;
 
-	spin_lock(&cap->session->s_cap_lock);
+	spin_lock(&cap->session->s_gen_ttl_lock);
 	gen = cap->session->s_cap_gen;
 	ttl = cap->session->s_cap_ttl;
-	spin_unlock(&cap->session->s_cap_lock);
+	spin_unlock(&cap->session->s_gen_ttl_lock);
 
 	if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
 		dout("__cap_is_valid %p cap %p issued %s "

fs/ceph/dir.c

@@ -975,10 +975,10 @@ static int dentry_lease_is_valid(struct dentry *dentry)
 	di = ceph_dentry(dentry);
 	if (di->lease_session) {
 		s = di->lease_session;
-		spin_lock(&s->s_cap_lock);
+		spin_lock(&s->s_gen_ttl_lock);
 		gen = s->s_cap_gen;
 		ttl = s->s_cap_ttl;
-		spin_unlock(&s->s_cap_lock);
+		spin_unlock(&s->s_gen_ttl_lock);
 
 		if (di->lease_gen == gen &&
 		    time_before(jiffies, dentry->d_time) &&

fs/ceph/mds_client.c

@@ -262,6 +262,7 @@ static int parse_reply_info(struct ceph_msg *msg,
 	/* trace */
 	ceph_decode_32_safe(&p, end, len, bad);
 	if (len > 0) {
+		ceph_decode_need(&p, end, len, bad);
 		err = parse_reply_info_trace(&p, p+len, info, features);
 		if (err < 0)
 			goto out_bad;
@@ -270,6 +271,7 @@ static int parse_reply_info(struct ceph_msg *msg,
 	/* extra */
 	ceph_decode_32_safe(&p, end, len, bad);
 	if (len > 0) {
+		ceph_decode_need(&p, end, len, bad);
 		err = parse_reply_info_extra(&p, p+len, info, features);
 		if (err < 0)
 			goto out_bad;
@@ -398,9 +400,11 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
 	s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
 	s->s_con.peer_name.num = cpu_to_le64(mds);
 
-	spin_lock_init(&s->s_cap_lock);
+	spin_lock_init(&s->s_gen_ttl_lock);
 	s->s_cap_gen = 0;
 	s->s_cap_ttl = 0;
+
+	spin_lock_init(&s->s_cap_lock);
 	s->s_renew_requested = 0;
 	s->s_renew_seq = 0;
 	INIT_LIST_HEAD(&s->s_caps);
@@ -2326,10 +2330,10 @@ static void handle_session(struct ceph_mds_session *session,
 	case CEPH_SESSION_STALE:
 		pr_info("mds%d caps went stale, renewing\n",
 			session->s_mds);
-		spin_lock(&session->s_cap_lock);
+		spin_lock(&session->s_gen_ttl_lock);
 		session->s_cap_gen++;
 		session->s_cap_ttl = 0;
-		spin_unlock(&session->s_cap_lock);
+		spin_unlock(&session->s_gen_ttl_lock);
 		send_renew_caps(mdsc, session);
 		break;
 

fs/ceph/mds_client.h

@@ -117,10 +117,13 @@ struct ceph_mds_session {
 	void             *s_authorizer_buf, *s_authorizer_reply_buf;
 	size_t            s_authorizer_buf_len, s_authorizer_reply_buf_len;
 
-	/* protected by s_cap_lock */
-	spinlock_t        s_cap_lock;
+	/* protected by s_gen_ttl_lock */
+	spinlock_t        s_gen_ttl_lock;
 	u32               s_cap_gen;  /* inc each time we get mds stale msg */
 	unsigned long     s_cap_ttl;  /* when session caps expire */
+
+	/* protected by s_cap_lock */
+	spinlock_t        s_cap_lock;
 	struct list_head  s_caps;     /* all caps issued by this session */
 	int               s_nr_caps, s_trim_caps;
 	int               s_num_cap_releases;

fs/ceph/xattr.c

@@ -111,8 +111,10 @@ static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
 }
 
 static struct ceph_vxattr_cb ceph_file_vxattrs[] = {
+	{ true, "ceph.file.layout", ceph_vxattrcb_layout},
+	/* The following extended attribute name is deprecated */
 	{ true, "ceph.layout", ceph_vxattrcb_layout},
-	{ NULL, NULL }
+	{ true, NULL, NULL }
 };
 
 static struct ceph_vxattr_cb *ceph_inode_vxattrs(struct inode *inode)

net/ceph/ceph_common.c

@@ -85,8 +85,6 @@ int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
 	} else {
 		pr_info("client%lld fsid %pU\n", ceph_client_id(client), fsid);
 		memcpy(&client->fsid, fsid, sizeof(*fsid));
-		ceph_debugfs_client_init(client);
-		client->have_fsid = true;
 	}
 	return 0;
 }

net/ceph/mon_client.c

@@ -8,8 +8,8 @@
 
 #include <linux/ceph/mon_client.h>
 #include <linux/ceph/libceph.h>
+#include <linux/ceph/debugfs.h>
 #include <linux/ceph/decode.h>
-
 #include <linux/ceph/auth.h>
 
 /*
@@ -340,8 +340,19 @@ static void ceph_monc_handle_map(struct ceph_mon_client *monc,
 	client->monc.monmap = monmap;
 	kfree(old);
 
+	if (!client->have_fsid) {
+		client->have_fsid = true;
+		mutex_unlock(&monc->mutex);
+		/*
+		 * do debugfs initialization without mutex to avoid
+		 * creating a locking dependency
+		 */
+		ceph_debugfs_client_init(client);
+		goto out_unlocked;
+	}
 out:
 	mutex_unlock(&monc->mutex);
+out_unlocked:
 	wake_up_all(&client->auth_wq);
 }