1 files changed, 387 insertions, 0 deletions

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
new file mode 100644
index 0000000000000..ca94a837a5bba
--- /dev/null
+++ b/fs/dlm/debug_fs.c
@@ -0,0 +1,387 @@
+/******************************************************************************
+*******************************************************************************
+**
+**  Copyright (C) 2005 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
+**  of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include <linux/pagemap.h>
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+
+#include "dlm_internal.h"
+
+#define DLM_DEBUG_BUF_LEN 4096
+static char debug_buf[DLM_DEBUG_BUF_LEN];
+static struct mutex debug_buf_lock;
+
+static struct dentry *dlm_root;
+
+struct rsb_iter {
+	int entry;
+	struct dlm_ls *ls;
+	struct list_head *next;
+	struct dlm_rsb *rsb;
+};
+
+/*
+ * dump all rsb's in the lockspace hash table
+ */
+
+static char *print_lockmode(int mode)
+{
+	switch (mode) {
+	case DLM_LOCK_IV:
+		return "--";
+	case DLM_LOCK_NL:
+		return "NL";
+	case DLM_LOCK_CR:
+		return "CR";
+	case DLM_LOCK_CW:
+		return "CW";
+	case DLM_LOCK_PR:
+		return "PR";
+	case DLM_LOCK_PW:
+		return "PW";
+	case DLM_LOCK_EX:
+		return "EX";
+	default:
+		return "??";
+	}
+}
+
+static void print_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));
+
+	if (lkb->lkb_status == DLM_LKSTS_CONVERT
+	    || lkb->lkb_status == DLM_LKSTS_WAITING)
+		seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
+
+	if (lkb->lkb_nodeid) {
+		if (lkb->lkb_nodeid != res->res_nodeid)
+			seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
+				   lkb->lkb_remid);
+		else
+			seq_printf(s, " Master:     %08x", lkb->lkb_remid);
+	}
+
+	if (lkb->lkb_wait_type)
+		seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
+
+	seq_printf(s, "\n");
+}
+
+static int print_resource(struct dlm_rsb *res, struct seq_file *s)
+{
+	struct dlm_lkb *lkb;
+	int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
+
+	seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
+	for (i = 0; i < res->res_length; i++) {
+		if (isprint(res->res_name[i]))
+			seq_printf(s, "%c", res->res_name[i]);
+		else
+			seq_printf(s, "%c", '.');
+	}
+	if (res->res_nodeid > 0)
+		seq_printf(s, "\"  \nLocal Copy, Master is node %d\n",
+			   res->res_nodeid);
+	else if (res->res_nodeid == 0)
+		seq_printf(s, "\"  \nMaster Copy\n");
+	else if (res->res_nodeid == -1)
+		seq_printf(s, "\"  \nLooking up master (lkid %x)\n",
+			   res->res_first_lkid);
+	else
+		seq_printf(s, "\"  \nInvalid master %d\n", res->res_nodeid);
+
+	/* Print the LVB: */
+	if (res->res_lvbptr) {
+		seq_printf(s, "LVB: ");
+		for (i = 0; i < lvblen; i++) {
+			if (i == lvblen / 2)
+				seq_printf(s, "\n     ");
+			seq_printf(s, "%02x ",
+				   (unsigned char) res->res_lvbptr[i]);
+		}
+		if (rsb_flag(res, RSB_VALNOTVALID))
+			seq_printf(s, " (INVALID)");
+		seq_printf(s, "\n");
+	}
+
+	root_list = !list_empty(&res->res_root_list);
+	recover_list = !list_empty(&res->res_recover_list);
+
+	if (root_list || recover_list) {
+		seq_printf(s, "Recovery: root %d recover %d flags %lx "
+			   "count %d\n", root_list, recover_list,
+			   res->res_flags, res->res_recover_locks_count);
+	}
+
+	/* Print the locks attached to this resource */
+	seq_printf(s, "Granted Queue\n");
+	list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue)
+		print_lock(s, lkb, res);
+
+	seq_printf(s, "Conversion Queue\n");
+	list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue)
+		print_lock(s, lkb, res);
+
+	seq_printf(s, "Waiting Queue\n");
+	list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue)
+		print_lock(s, lkb, res);
+
+	if (list_empty(&res->res_lookup))
+		goto out;
+
+	seq_printf(s, "Lookup Queue\n");
+	list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
+		seq_printf(s, "%08x %s", lkb->lkb_id,
+			   print_lockmode(lkb->lkb_rqmode));
+		if (lkb->lkb_wait_type)
+			seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
+		seq_printf(s, "\n");
+	}
+ out:
+	return 0;
+}
+
+static int rsb_iter_next(struct rsb_iter *ri)
+{
+	struct dlm_ls *ls = ri->ls;
+	int i;
+
+	if (!ri->next) {
+ top:
+		/* Find the next non-empty hash bucket */
+		for (i = ri->entry; i < ls->ls_rsbtbl_size; i++) {
+			read_lock(&ls->ls_rsbtbl[i].lock);
+			if (!list_empty(&ls->ls_rsbtbl[i].list)) {
+				ri->next = ls->ls_rsbtbl[i].list.next;
+				read_unlock(&ls->ls_rsbtbl[i].lock);
+				break;
+			}
+			read_unlock(&ls->ls_rsbtbl[i].lock);
+                }
+		ri->entry = i;
+
+		if (ri->entry >= ls->ls_rsbtbl_size)
+			return 1;
+	} else {
+		i = ri->entry;
+		read_lock(&ls->ls_rsbtbl[i].lock);
+		ri->next = ri->next->next;
+		if (ri->next->next == ls->ls_rsbtbl[i].list.next) {
+			/* End of list - move to next bucket */
+			ri->next = NULL;
+			ri->entry++;
+			read_unlock(&ls->ls_rsbtbl[i].lock);
+			goto top;
+                }
+		read_unlock(&ls->ls_rsbtbl[i].lock);
+	}
+	ri->rsb = list_entry(ri->next, struct dlm_rsb, res_hashchain);
+
+	return 0;
+}
+
+static void rsb_iter_free(struct rsb_iter *ri)
+{
+	kfree(ri);
+}
+
+static struct rsb_iter *rsb_iter_init(struct dlm_ls *ls)
+{
+	struct rsb_iter *ri;
+
+	ri = kmalloc(sizeof *ri, GFP_KERNEL);
+	if (!ri)
+		return NULL;
+
+	ri->ls = ls;
+	ri->entry = 0;
+	ri->next = NULL;
+
+	if (rsb_iter_next(ri)) {
+		rsb_iter_free(ri);
+		return NULL;
+	}
+
+	return ri;
+}
+
+static void *rsb_seq_start(struct seq_file *file, loff_t *pos)
+{
+	struct rsb_iter *ri;
+	loff_t n = *pos;
+
+	ri = rsb_iter_init(file->private);
+	if (!ri)
+		return NULL;
+
+	while (n--) {
+		if (rsb_iter_next(ri)) {
+			rsb_iter_free(ri);
+			return NULL;
+		}
+	}
+
+	return ri;
+}
+
+static void *rsb_seq_next(struct seq_file *file, void *iter_ptr, loff_t *pos)
+{
+	struct rsb_iter *ri = iter_ptr;
+
+	(*pos)++;
+
+	if (rsb_iter_next(ri)) {
+		rsb_iter_free(ri);
+		return NULL;
+	}
+
+	return ri;
+}
+
+static void rsb_seq_stop(struct seq_file *file, void *iter_ptr)
+{
+	/* nothing for now */
+}
+
+static int rsb_seq_show(struct seq_file *file, void *iter_ptr)
+{
+	struct rsb_iter *ri = iter_ptr;
+
+	print_resource(ri->rsb, file);
+
+	return 0;
+}
+
+static struct seq_operations rsb_seq_ops = {
+	.start = rsb_seq_start,
+	.next  = rsb_seq_next,
+	.stop  = rsb_seq_stop,
+	.show  = rsb_seq_show,
+};
+
+static int rsb_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int ret;
+
+	ret = seq_open(file, &rsb_seq_ops);
+	if (ret)
+		return ret;
+
+	seq = file->private_data;
+	seq->private = inode->i_private;
+
+	return 0;
+}
+
+static struct file_operations rsb_fops = {
+	.owner   = THIS_MODULE,
+	.open    = rsb_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release
+};
+
+/*
+ * dump lkb's on the ls_waiters list
+ */
+
+static int waiters_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t waiters_read(struct file *file, char __user *userbuf,
+			    size_t count, loff_t *ppos)
+{
+	struct dlm_ls *ls = file->private_data;
+	struct dlm_lkb *lkb;
+	size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
+
+	mutex_lock(&debug_buf_lock);
+	mutex_lock(&ls->ls_waiters_mutex);
+	memset(debug_buf, 0, sizeof(debug_buf));
+
+	list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
+		ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
+			       lkb->lkb_id, lkb->lkb_wait_type,
+			       lkb->lkb_nodeid, lkb->lkb_resource->res_name);
+		if (ret >= len - pos)
+			break;
+		pos += ret;
+	}
+	mutex_unlock(&ls->ls_waiters_mutex);
+
+	rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
+	mutex_unlock(&debug_buf_lock);
+	return rv;
+}
+
+static struct file_operations waiters_fops = {
+	.owner   = THIS_MODULE,
+	.open    = waiters_open,
+	.read    = waiters_read
+};
+
+int dlm_create_debug_file(struct dlm_ls *ls)
+{
+	char name[DLM_LOCKSPACE_LEN+8];
+
+	ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
+						      S_IFREG | S_IRUGO,
+						      dlm_root,
+						      ls,
+						      &rsb_fops);
+	if (!ls->ls_debug_rsb_dentry)
+		return -ENOMEM;
+
+	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;
+	}
+
+	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);
+}
+
+int dlm_register_debugfs(void)
+{
+	mutex_init(&debug_buf_lock);
+	dlm_root = debugfs_create_dir("dlm", NULL);
+	return dlm_root ? 0 : -ENOMEM;
+}
+
+void dlm_unregister_debugfs(void)
+{
+	debugfs_remove(dlm_root);
+}
+