--- /dev/null
+/******************************************************************************
+*******************************************************************************
+**
+** 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 const 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 const 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);
+}
+
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