[PATCH 09/10] dlm: add new debugfs entry
From: David Teigland
Date: Tue Dec 23 2008 - 11:15:34 EST
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 <teigland@xxxxxxxxxx>
---
fs/dlm/debug_fs.c | 296 ++++++++++++++++++++++++++++++++++++++++--------
fs/dlm/dlm_internal.h | 1 +
2 files changed, 247 insertions(+), 50 deletions(-)
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 19e4f9e..2f107d1 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -1,7 +1,7 @@
/******************************************************************************
*******************************************************************************
**
-** 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
@@ -27,7 +27,7 @@ static struct dentry *dlm_root;
struct rsb_iter {
int entry;
- int locks;
+ int format;
int header;
struct dlm_ls *ls;
struct list_head *next;
@@ -60,8 +60,8 @@ static char *print_lockmode(int mode)
}
}
-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));
@@ -83,7 +83,7 @@ static void print_resource_lock(struct seq_file *s, struct dlm_lkb *lkb,
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;
@@ -134,15 +134,15 @@ static int print_resource(struct dlm_rsb *res, struct seq_file *s)
/* 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;
@@ -160,7 +160,8 @@ static int print_resource(struct dlm_rsb *res, struct seq_file *s)
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;
@@ -193,20 +194,108 @@ static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *
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;
@@ -231,7 +320,7 @@ static int rsb_iter_next(struct rsb_iter *ri)
break;
}
read_unlock(&ls->ls_rsbtbl[i].lock);
- }
+ }
ri->entry = i;
if (ri->entry >= ls->ls_rsbtbl_size)
@@ -248,7 +337,7 @@ static int rsb_iter_next(struct rsb_iter *ri)
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);
@@ -274,6 +363,7 @@ static struct rsb_iter *rsb_iter_init(struct dlm_ls *ls)
ri->ls = ls;
ri->entry = 0;
ri->next = NULL;
+ ri->format = 1;
if (rsb_iter_next(ri)) {
rsb_iter_free(ri);
@@ -325,16 +415,26 @@ static int rsb_seq_show(struct seq_file *file, void *iter_ptr)
{
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;
@@ -385,7 +485,7 @@ static struct rsb_iter *locks_iter_init(struct dlm_ls *ls, loff_t *pos)
ri->ls = ls;
ri->entry = 0;
ri->next = NULL;
- ri->locks = 1;
+ ri->format = 2;
if (*pos == 0)
ri->header = 1;
@@ -448,6 +548,84 @@ static const struct file_operations locks_fops = {
};
/*
+ * 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
*/
@@ -489,30 +667,33 @@ static const struct file_operations waiters_fops = {
.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,
dlm_root,
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);
@@ -522,23 +703,38 @@ int dlm_create_debug_file(struct dlm_ls *ls)
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)
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 0c48829..ef2f1e3 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -482,6 +482,7 @@ struct dlm_ls {
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;
--
1.5.5.1
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