ceph: fix debugfs entry, simplify fsid checks

We may first learn our fsid from any of the mon, osd, or mds maps
(whichever the monitor sends first).  Consolidate checks in a single
helper.  Initialize the client debugfs entry then, since we need the
fsid (and global_id) for the directory name.

Also remove dead mount code.

Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/debugfs.c

@@ -7,6 +7,8 @@
 
 #include "super.h"
 #include "mds_client.h"
+#include "mon_client.h"
+#include "auth.h"
 
 #ifdef CONFIG_DEBUG_FS
 
@@ -335,7 +337,7 @@ int ceph_debugfs_client_init(struct ceph_client *client)
 	char name[80];
 
 	snprintf(name, sizeof(name), FSID_FORMAT ".client%lld",
-		 PR_FSID(&client->monc.monmap->fsid), client->whoami);
+		 PR_FSID(&client->fsid), client->monc.auth->global_id);
 
 	client->debugfs_dir = debugfs_create_dir(name, ceph_debugfs_dir);
 	if (!client->debugfs_dir)

fs/ceph/mds_client.c

@@ -2782,16 +2782,8 @@ void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
 
 	ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
 	ceph_decode_copy(&p, &fsid, sizeof(fsid));
-        if (mdsc->client->monc.have_fsid) {
-		if (ceph_fsid_compare(&fsid,
-				      &mdsc->client->monc.monmap->fsid)) {
-			pr_err("got mdsmap with wrong fsid\n");
-			return;
-		}
-	} else {
-		ceph_fsid_set(&mdsc->client->monc.monmap->fsid, &fsid);
-		mdsc->client->monc.have_fsid = true;
-	}
+	if (ceph_check_fsid(mdsc->client, &fsid) < 0)
+		return;
 	epoch = ceph_decode_32(&p);
 	maplen = ceph_decode_32(&p);
 	dout("handle_map epoch %u len %d\n", epoch, (int)maplen);

fs/ceph/mon_client.c

@@ -320,89 +320,12 @@ int ceph_monc_open_session(struct ceph_mon_client *monc)
 	return 0;
 }
 
-#if 0
-
-/*
- * The monitor responds with mount ack indicate mount success.  The
- * included client ticket allows the client to talk to MDSs and OSDs.
- */
-static void handle_mount_ack(struct ceph_mon_client *monc, struct ceph_msg *msg)
-{
-	struct ceph_client *client = monc->client;
-	struct ceph_monmap *monmap = NULL, *old = monc->monmap;
-	void *p, *end;
-	s32 result;
-	u32 len;
-	s64 cnum;
-	int err = -EINVAL;
-
-	if (client->whoami >= 0) {
-		dout("handle_mount_ack - already mounted\n");
-		return;
-	}
-
-	mutex_lock(&monc->mutex);
-
-	dout("handle_mount_ack\n");
-	p = msg->front.iov_base;
-	end = p + msg->front.iov_len;
-
-	ceph_decode_64_safe(&p, end, cnum, bad);
-	ceph_decode_32_safe(&p, end, result, bad);
-	ceph_decode_32_safe(&p, end, len, bad);
-	if (result) {
-		pr_err("mount denied: %.*s (%d)\n", len, (char *)p,
-		       result);
-		err = result;
-		goto out;
-	}
-	p += len;
-
-	ceph_decode_32_safe(&p, end, len, bad);
-	ceph_decode_need(&p, end, len, bad);
-	monmap = ceph_monmap_decode(p, p + len);
-	if (IS_ERR(monmap)) {
-		pr_err("problem decoding monmap, %d\n",
-		       (int)PTR_ERR(monmap));
-		err = -EINVAL;
-		goto out;
-	}
-	p += len;
-
-	client->monc.monmap = monmap;
-	kfree(old);
-
-	client->signed_ticket = NULL;
-	client->signed_ticket_len = 0;
-
-	monc->want_mount = false;
-
-	client->whoami = cnum;
-	client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
-	client->msgr->inst.name.num = cpu_to_le64(cnum);
-	pr_info("client%lld fsid " FSID_FORMAT "\n",
-		client->whoami, PR_FSID(&client->monc.monmap->fsid));
-
-	ceph_debugfs_client_init(client);
-	__send_subscribe(monc);
-
-	err = 0;
-	goto out;
-
-bad:
-	pr_err("error decoding mount_ack message\n");
-out:
-	client->mount_err = err;
-	mutex_unlock(&monc->mutex);
-	wake_up(&client->mount_wq);
-}
-#endif
-
 /*
  * The monitor responds with mount ack indicate mount success.  The
  * included client ticket allows the client to talk to MDSs and OSDs.
  */
-static void ceph_monc_handle_map(struct ceph_mon_client *monc, struct ceph_msg *msg)
+static void ceph_monc_handle_map(struct ceph_mon_client *monc,
+				 struct ceph_msg *msg)
 {
 	struct ceph_client *client = monc->client;
 	struct ceph_monmap *monmap = NULL, *old = monc->monmap;
@@ -420,42 +343,19 @@ static void ceph_monc_handle_map(struct ceph_mon_client *monc, struct ceph_msg *
 		       (int)PTR_ERR(monmap));
 		return;
 	}
-	if (monc->have_fsid &&
-	    ceph_fsid_compare(&monmap->fsid, &monc->monmap->fsid)) {
-		print_hex_dump(KERN_ERR, "monmap->fsid: ", DUMP_PREFIX_NONE, 16, 1,
-			       (void *)&monmap->fsid, 16, 0);
-		print_hex_dump(KERN_ERR, "monc->monmap->fsid: ", DUMP_PREFIX_NONE, 16, 1,
-			       (void *)&monc->monmap->fsid, 16, 0);
-
-		pr_err("fsid mismatch, got a previous map with different fsid");
+
+	if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
 		kfree(monmap);
 		return;
 	}
 
 	client->monc.monmap = monmap;
-	client->monc.have_fsid = true;
 	kfree(old);
 
 	mutex_unlock(&monc->mutex);
 	wake_up(&client->mount_wq);
 }
 
-
-/*
- * init client info after authentication
- */
-static void __init_authenticated_client(struct ceph_mon_client *monc)
-{
-	struct ceph_client *client = monc->client;
-
-	client->signed_ticket = NULL;
-	client->signed_ticket_len = 0;
-	client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
-	client->msgr->inst.name.num = monc->auth->global_id;
-
-	ceph_debugfs_client_init(client);
-}
-
 /*
  * statfs
  */
@@ -754,7 +654,10 @@ static void handle_auth_reply(struct ceph_mon_client *monc,
 		ceph_con_send(monc->con, monc->m_auth);
 	} else if (monc->auth->ops->is_authenticated(monc->auth)) {
 		dout("authenticated, starting session\n");
-		__init_authenticated_client(monc);
+
+		monc->client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
+		monc->client->msgr->inst.name.num = monc->auth->global_id;
+
 		__send_subscribe(monc);
 		__resend_statfs(monc);
 	}

fs/ceph/osd_client.c

@@ -882,16 +882,8 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 	/* verify fsid */
 	ceph_decode_need(&p, end, sizeof(fsid), bad);
 	ceph_decode_copy(&p, &fsid, sizeof(fsid));
-        if (osdc->client->monc.have_fsid) {
-		if (ceph_fsid_compare(&fsid,
-			              &osdc->client->monc.monmap->fsid)) {
-			pr_err("got osdmap with wrong fsid, ignoring\n");
-			return;
-		}
-	} else {
-		ceph_fsid_set(&osdc->client->monc.monmap->fsid, &fsid);
-		osdc->client->monc.have_fsid = true;
-	}
+	if (ceph_check_fsid(osdc->client, &fsid) < 0)
+		return;
 
 	down_write(&osdc->map_sem);
 

fs/ceph/super.c

@@ -19,6 +19,7 @@
 #include "decode.h"
 #include "super.h"
 #include "mon_client.h"
+#include "auth.h"
 
 /*
  * Ceph superblock operations
@@ -510,14 +511,11 @@ static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
 
 	client->sb = NULL;
 	client->mount_state = CEPH_MOUNT_MOUNTING;
-	client->whoami = -1;
 	client->mount_args = args;
 
 	client->msgr = NULL;
 
 	client->mount_err = 0;
-	client->signed_ticket = NULL;
-	client->signed_ticket_len = 0;
 
 	err = bdi_init(&client->backing_dev_info);
 	if (err < 0)
@@ -582,8 +580,6 @@ static void ceph_destroy_client(struct ceph_client *client)
 	ceph_monc_stop(&client->monc);
 	ceph_osdc_stop(&client->osdc);
 
-	kfree(client->signed_ticket);
-
 	ceph_debugfs_client_cleanup(client);
 	destroy_workqueue(client->wb_wq);
 	destroy_workqueue(client->pg_inv_wq);
@@ -599,6 +595,32 @@ static void ceph_destroy_client(struct ceph_client *client)
 	dout("destroy_client %p done\n", client);
 }
 
+/*
+ * Initially learn our fsid, or verify an fsid matches.
+ */
+int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
+{
+	if (client->have_fsid) {
+		if (ceph_fsid_compare(&client->fsid, fsid)) {
+			print_hex_dump(KERN_ERR, "this fsid: ",
+				       DUMP_PREFIX_NONE, 16, 1,
+				       (void *)fsid, 16, 0);
+			print_hex_dump(KERN_ERR, " old fsid: ",
+				       DUMP_PREFIX_NONE, 16, 1,
+				       (void *)&client->fsid, 16, 0);
+			pr_err("fsid mismatch\n");
+			return -1;
+		}
+	} else {
+		pr_info("client%lld fsid " FSID_FORMAT "\n",
+			client->monc.auth->global_id, PR_FSID(fsid));
+		memcpy(&client->fsid, fsid, sizeof(*fsid));
+		ceph_debugfs_client_init(client);
+		client->have_fsid = true;
+	}
+	return 0;
+}
+
 /*
  * true if we have the mon map (and have thus joined the cluster)
  */

fs/ceph/super.h

@@ -113,16 +113,11 @@ static inline unsigned long time_sub(unsigned long a, unsigned long b)
  * mounting the same ceph filesystem/cluster.
  */
 struct ceph_client {
-	__s64 whoami;                   /* my client number */
-#ifdef CONFIG_DEBUG_FS
-	struct dentry *debugfs_monmap;
-	struct dentry *debugfs_mdsmap, *debugfs_osdmap;
-	struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
-#endif
+	struct ceph_fsid fsid;
+	bool have_fsid;
 
 	struct mutex mount_mutex;       /* serialize mount attempts */
 	struct ceph_mount_args *mount_args;
-	struct ceph_fsid fsid;
 
 	struct super_block *sb;
 
@@ -130,8 +125,6 @@ struct ceph_client {
 	wait_queue_head_t mount_wq;
 
 	int mount_err;
-	void *signed_ticket;           /* our keys to the kingdom */
-	int signed_ticket_len;
 
 	struct ceph_messenger *msgr;   /* messenger instance */
 	struct ceph_mon_client monc;
@@ -145,6 +138,12 @@ struct ceph_client {
 	struct workqueue_struct *trunc_wq;
 
 	struct backing_dev_info backing_dev_info;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *debugfs_monmap;
+	struct dentry *debugfs_mdsmap, *debugfs_osdmap;
+	struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
+#endif
 };
 
 static inline struct ceph_client *ceph_client(struct super_block *sb)
@@ -735,6 +734,7 @@ extern struct kmem_cache *ceph_dentry_cachep;
 extern struct kmem_cache *ceph_file_cachep;
 
 extern const char *ceph_msg_type_name(int type);
+extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
 
 #define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
 	"%02x%02x%02x%02x%02x%02x"