dlm: add new debugfs entry

The new debugfs entry dumps all rsb and lkb structures, and includes
a lot more information than has been available before. This includes
the new timestamps added by a previous patch for debugging callback
issues.

Signed-off-by: David Teigland <[e-mail]>

fs/dlm/debug_fs.c

···
 /******************************************************************************
 *******************************************************************************
 **
-**  Copyright (C) 2005 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2005-2008 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
···
 
 struct rsb_iter {
 	int entry;
-	int locks;
+	int format;
 	int header;
 	struct dlm_ls *ls;
 	struct list_head *next;
···
 	}
 }
 
-static void print_resource_lock(struct seq_file *s, struct dlm_lkb *lkb,
-				struct dlm_rsb *res)
+static void print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
+			       struct dlm_rsb *res)
 {
 	seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
 
···
 	seq_printf(s, "\n");
 }
 
-static int print_resource(struct dlm_rsb *res, struct seq_file *s)
+static int print_format1(struct dlm_rsb *res, struct seq_file *s)
 {
 	struct dlm_lkb *lkb;
 	int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
···
 	/* Print the locks attached to this resource */
 	seq_printf(s, "Granted Queue\n");
 	list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue)
-		print_resource_lock(s, lkb, res);
+		print_format1_lock(s, lkb, res);
 
 	seq_printf(s, "Conversion Queue\n");
 	list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue)
-		print_resource_lock(s, lkb, res);
+		print_format1_lock(s, lkb, res);
 
 	seq_printf(s, "Waiting Queue\n");
 	list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue)
-		print_resource_lock(s, lkb, res);
+		print_format1_lock(s, lkb, res);
 
 	if (list_empty(&res->res_lookup))
 		goto out;
···
 	return 0;
 }
 
-static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *r)
+static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
+			       struct dlm_rsb *r)
 {
 	u64 xid = 0;
 	u64 us;
···
 		   r->res_name);
 }
 
-static int print_locks(struct dlm_rsb *r, struct seq_file *s)
+static int print_format2(struct dlm_rsb *r, struct seq_file *s)
 {
 	struct dlm_lkb *lkb;
 
 	lock_rsb(r);
 
 	list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue)
-		print_lock(s, lkb, r);
+		print_format2_lock(s, lkb, r);
 
 	list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue)
-		print_lock(s, lkb, r);
+		print_format2_lock(s, lkb, r);
 
 	list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue)
-		print_lock(s, lkb, r);
+		print_format2_lock(s, lkb, r);
+
+	unlock_rsb(r);
+	return 0;
+}
+
+static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
+			       int rsb_lookup)
+{
+	u64 xid = 0;
+
+	if (lkb->lkb_flags & DLM_IFL_USER) {
+		if (lkb->lkb_ua)
+			xid = lkb->lkb_ua->xid;
+	}
+
+	seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
+		   lkb->lkb_id,
+		   lkb->lkb_nodeid,
+		   lkb->lkb_remid,
+		   lkb->lkb_ownpid,
+		   (unsigned long long)xid,
+		   lkb->lkb_exflags,
+		   lkb->lkb_flags,
+		   lkb->lkb_status,
+		   lkb->lkb_grmode,
+		   lkb->lkb_rqmode,
+		   lkb->lkb_highbast,
+		   rsb_lookup,
+		   lkb->lkb_wait_type,
+		   lkb->lkb_lvbseq,
+		   (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
+		   (unsigned long long)ktime_to_ns(lkb->lkb_time_bast));
+}
+
+static int print_format3(struct dlm_rsb *r, struct seq_file *s)
+{
+	struct dlm_lkb *lkb;
+	int i, lvblen = r->res_ls->ls_lvblen;
+	int print_name = 1;
+
+	lock_rsb(r);
+
+	seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
+		   r,
+		   r->res_nodeid,
+		   r->res_first_lkid,
+		   r->res_flags,
+		   !list_empty(&r->res_root_list),
+		   !list_empty(&r->res_recover_list),
+		   r->res_recover_locks_count,
+		   r->res_length);
+
+	for (i = 0; i < r->res_length; i++) {
+		if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
+			print_name = 0;
+	}
+
+	seq_printf(s, "%s", print_name ? "str " : "hex");
+
+	for (i = 0; i < r->res_length; i++) {
+		if (print_name)
+			seq_printf(s, "%c", r->res_name[i]);
+		else
+			seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
+	}
+	seq_printf(s, "\n");
+
+	if (!r->res_lvbptr)
+		goto do_locks;
+
+	seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen);
+
+	for (i = 0; i < lvblen; i++)
+		seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
+	seq_printf(s, "\n");
+
+ do_locks:
+	list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue)
+		print_format3_lock(s, lkb, 0);
+
+	list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue)
+		print_format3_lock(s, lkb, 0);
+
+	list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue)
+		print_format3_lock(s, lkb, 0);
+
+	list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup)
+		print_format3_lock(s, lkb, 1);
 
 	unlock_rsb(r);
 	return 0;
···
 				break;
 			}
 			read_unlock(&ls->ls_rsbtbl[i].lock);
-                }
+		}
 		ri->entry = i;
 
 		if (ri->entry >= ls->ls_rsbtbl_size)
···
 			read_unlock(&ls->ls_rsbtbl[i].lock);
 			dlm_put_rsb(old);
 			goto top;
-                }
+		}
 		ri->rsb = list_entry(ri->next, struct dlm_rsb, res_hashchain);
 		dlm_hold_rsb(ri->rsb);
 		read_unlock(&ls->ls_rsbtbl[i].lock);
···
 	ri->ls = ls;
 	ri->entry = 0;
 	ri->next = NULL;
+	ri->format = 1;
 
 	if (rsb_iter_next(ri)) {
 		rsb_iter_free(ri);
···
 {
 	struct rsb_iter *ri = iter_ptr;
 
-	if (ri->locks) {
+	switch (ri->format) {
+	case 1:
+		print_format1(ri->rsb, file);
+		break;
+	case 2:
 		if (ri->header) {
-			seq_printf(file, "id nodeid remid pid xid exflags flags "
-					 "sts grmode rqmode time_ms r_nodeid "
-					 "r_len r_name\n");
+			seq_printf(file, "id nodeid remid pid xid exflags "
+					 "flags sts grmode rqmode time_ms "
+					 "r_nodeid r_len r_name\n");
 			ri->header = 0;
 		}
-		print_locks(ri->rsb, file);
-	} else {
-		print_resource(ri->rsb, file);
+		print_format2(ri->rsb, file);
+		break;
+	case 3:
+		if (ri->header) {
+			seq_printf(file, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
+			ri->header = 0;
+		}
+		print_format3(ri->rsb, file);
+		break;
 	}
 
 	return 0;
···
 	ri->ls = ls;
 	ri->entry = 0;
 	ri->next = NULL;
-	ri->locks = 1;
+	ri->format = 2;
 
 	if (*pos == 0)
 		ri->header = 1;
···
 };
 
 /*
+ * Dump all rsb/lvb/lkb state in compact listing, more complete than _locks
+ * This can replace both formats 1 and 2 eventually.
+ */
+
+static struct rsb_iter *all_iter_init(struct dlm_ls *ls, loff_t *pos)
+{
+	struct rsb_iter *ri;
+
+	ri = kzalloc(sizeof *ri, GFP_KERNEL);
+	if (!ri)
+		return NULL;
+
+	ri->ls = ls;
+	ri->entry = 0;
+	ri->next = NULL;
+	ri->format = 3;
+
+	if (*pos == 0)
+		ri->header = 1;
+
+	if (rsb_iter_next(ri)) {
+		rsb_iter_free(ri);
+		return NULL;
+	}
+
+	return ri;
+}
+
+static void *all_seq_start(struct seq_file *file, loff_t *pos)
+{
+	struct rsb_iter *ri;
+	loff_t n = *pos;
+
+	ri = all_iter_init(file->private, pos);
+	if (!ri)
+		return NULL;
+
+	while (n--) {
+		if (rsb_iter_next(ri)) {
+			rsb_iter_free(ri);
+			return NULL;
+		}
+	}
+
+	return ri;
+}
+
+static struct seq_operations all_seq_ops = {
+	.start = all_seq_start,
+	.next  = rsb_seq_next,
+	.stop  = rsb_seq_stop,
+	.show  = rsb_seq_show,
+};
+
+static int all_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int ret;
+
+	ret = seq_open(file, &all_seq_ops);
+	if (ret)
+		return ret;
+
+	seq = file->private_data;
+	seq->private = inode->i_private;
+
+	return 0;
+}
+
+static const struct file_operations all_fops = {
+	.owner   = THIS_MODULE,
+	.open    = all_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release
+};
+
+/*
  * dump lkb's on the ls_waiters list
  */
 
···
 	.read    = waiters_read
 };
 
+void dlm_delete_debug_file(struct dlm_ls *ls)
+{
+	if (ls->ls_debug_rsb_dentry)
+		debugfs_remove(ls->ls_debug_rsb_dentry);
+	if (ls->ls_debug_waiters_dentry)
+		debugfs_remove(ls->ls_debug_waiters_dentry);
+	if (ls->ls_debug_locks_dentry)
+		debugfs_remove(ls->ls_debug_locks_dentry);
+	if (ls->ls_debug_all_dentry)
+		debugfs_remove(ls->ls_debug_all_dentry);
+}
+
 int dlm_create_debug_file(struct dlm_ls *ls)
 {
 	char name[DLM_LOCKSPACE_LEN+8];
+
+	/* format 1 */
 
 	ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
 						      S_IFREG | S_IRUGO,
···
 						      ls,
 						      &rsb_fops);
 	if (!ls->ls_debug_rsb_dentry)
-		return -ENOMEM;
+		goto fail;
 
-	memset(name, 0, sizeof(name));
-	snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
-
-	ls->ls_debug_waiters_dentry = debugfs_create_file(name,
-							  S_IFREG | S_IRUGO,
-							  dlm_root,
-							  ls,
-							  &waiters_fops);
-	if (!ls->ls_debug_waiters_dentry) {
-		debugfs_remove(ls->ls_debug_rsb_dentry);
-		return -ENOMEM;
-	}
+	/* format 2 */
 
 	memset(name, 0, sizeof(name));
 	snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name);
···
 							dlm_root,
 							ls,
 							&locks_fops);
-	if (!ls->ls_debug_locks_dentry) {
-		debugfs_remove(ls->ls_debug_waiters_dentry);
-		debugfs_remove(ls->ls_debug_rsb_dentry);
-		return -ENOMEM;
-	}
+	if (!ls->ls_debug_locks_dentry)
+		goto fail;
+
+	/* format 3 */
+
+	memset(name, 0, sizeof(name));
+	snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name);
+
+	ls->ls_debug_all_dentry = debugfs_create_file(name,
+						      S_IFREG | S_IRUGO,
+						      dlm_root,
+						      ls,
+						      &all_fops);
+	if (!ls->ls_debug_all_dentry)
+		goto fail;
+
+	memset(name, 0, sizeof(name));
+	snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
+
+	ls->ls_debug_waiters_dentry = debugfs_create_file(name,
+							  S_IFREG | S_IRUGO,
+							  dlm_root,
+							  ls,
+							  &waiters_fops);
+	if (!ls->ls_debug_waiters_dentry)
+		goto fail;
 
 	return 0;
-}
 
-void dlm_delete_debug_file(struct dlm_ls *ls)
-{
-	if (ls->ls_debug_rsb_dentry)
-		debugfs_remove(ls->ls_debug_rsb_dentry);
-	if (ls->ls_debug_waiters_dentry)
-		debugfs_remove(ls->ls_debug_waiters_dentry);
-	if (ls->ls_debug_locks_dentry)
-		debugfs_remove(ls->ls_debug_locks_dentry);
+ fail:
+	dlm_delete_debug_file(ls);
+	return -ENOMEM;
 }
 
 int __init dlm_register_debugfs(void)

fs/dlm/dlm_internal.h

···
 	struct dentry		*ls_debug_rsb_dentry; /* debugfs */
 	struct dentry		*ls_debug_waiters_dentry; /* debugfs */
 	struct dentry		*ls_debug_locks_dentry; /* debugfs */
+	struct dentry		*ls_debug_all_dentry; /* debugfs */
 
 	wait_queue_head_t	ls_uevent_wait;	/* user part of join/leave */
 	int			ls_uevent_result;