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jbd: config_jbd_debug cannot create /proc entry 

The jbd-debug file used to be located in /proc/sys/fs/jbd-debug, but
create_proc_entry() does not do lookups on file names that are more that
one directory deep.  This causes the entry creation to fail and hence, no
proc file is created.

Instead of fixing this on procfs might as well move the jbd2-debug file to
debugfs which would be the preferred location for this kind of tunable.
The new location is now /sys/kernel/debug/jbd/jbd-debug.

[akpm@linux-foundation.org: zillions of cleanups]
Signed-off-by: Jose R. Santos <jrs@us.ibm.com>
Acked-by: Jan Kara <jack@suse.cz>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jose R. Santos 2007-10-18 23:39:22 -07:00 committed by Linus Torvalds
parent 1c09924448
commit c2a9159cdd
3 changed files with 31 additions and 53 deletions
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10
fs/Kconfig
View File

@ -220,7 +220,7 @@ config JBD
config JBD_DEBUG
bool "JBD (ext3) debugging support"
depends on JBD
depends on JBD && DEBUG_FS
help
If you are using the ext3 journaled file system (or potentially any
other file system/device using JBD), this option allows you to
@ -229,10 +229,10 @@ config JBD_DEBUG
debugging output will be turned off.
If you select Y here, then you will be able to turn on debugging
with "echo N > /proc/sys/fs/jbd-debug", where N is a number between
1 and 5, the higher the number, the more debugging output is
generated. To turn debugging off again, do
"echo 0 > /proc/sys/fs/jbd-debug".
with "echo N > /sys/kernel/debug/jbd/jbd-debug", where N is a
number between 1 and 5, the higher the number, the more debugging
output is generated. To turn debugging off again, do
"echo 0 > /sys/kernel/debug/jbd/jbd-debug".
config JBD2
tristate

72
fs/jbd/journal.c
View File

@ -35,6 +35,7 @@
#include <linux/kthread.h>
#include <linux/poison.h>
#include <linux/proc_fs.h>
#include <linux/debugfs.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@ -1851,63 +1852,40 @@ void journal_put_journal_head(struct journal_head *jh)
}
/*
* /proc tunables
* debugfs tunables
*/
#if defined(CONFIG_JBD_DEBUG)
int journal_enable_debug;
#ifdef CONFIG_JBD_DEBUG
u8 journal_enable_debug __read_mostly;
EXPORT_SYMBOL(journal_enable_debug);
#endif
#if defined(CONFIG_JBD_DEBUG) && defined(CONFIG_PROC_FS)
static struct dentry *jbd_debugfs_dir;
static struct dentry *jbd_debug;
static struct proc_dir_entry *proc_jbd_debug;
static int read_jbd_debug(char *page, char **start, off_t off,
int count, int *eof, void *data)
static void __init jbd_create_debugfs_entry(void)
{
int ret;
ret = sprintf(page + off, "%d\n", journal_enable_debug);
*eof = 1;
return ret;
jbd_debugfs_dir = debugfs_create_dir("jbd", NULL);
if (jbd_debugfs_dir)
jbd_debug = debugfs_create_u8("jbd-debug", S_IRUGO,
jbd_debugfs_dir,
&journal_enable_debug);
}
static int write_jbd_debug(struct file *file, const char __user *buffer,
unsigned long count, void *data)
static void __exit jbd_remove_debugfs_entry(void)
{
char buf[32];
if (count > ARRAY_SIZE(buf) - 1)
count = ARRAY_SIZE(buf) - 1;
if (copy_from_user(buf, buffer, count))
return -EFAULT;
buf[ARRAY_SIZE(buf) - 1] = '\0';
journal_enable_debug = simple_strtoul(buf, NULL, 10);
return count;
}
#define JBD_PROC_NAME "sys/fs/jbd-debug"
static void __init create_jbd_proc_entry(void)
{
proc_jbd_debug = create_proc_entry(JBD_PROC_NAME, 0644, NULL);
if (proc_jbd_debug) {
/* Why is this so hard? */
proc_jbd_debug->read_proc = read_jbd_debug;
proc_jbd_debug->write_proc = write_jbd_debug;
}
}
static void __exit remove_jbd_proc_entry(void)
{
if (proc_jbd_debug)
remove_proc_entry(JBD_PROC_NAME, NULL);
debugfs_remove(jbd_debug);
debugfs_remove(jbd_debugfs_dir);
}
#else
#define create_jbd_proc_entry() do {} while (0)
#define remove_jbd_proc_entry() do {} while (0)
static inline void jbd_create_debugfs_entry(void)
{
}
static inline void jbd_remove_debugfs_entry(void)
{
}
#endif
@ -1965,7 +1943,7 @@ static int __init journal_init(void)
ret = journal_init_caches();
if (ret != 0)
journal_destroy_caches();
create_jbd_proc_entry();
jbd_create_debugfs_entry();
return ret;
}
@ -1976,7 +1954,7 @@ static void __exit journal_exit(void)
if (n)
printk(KERN_EMERG "JBD: leaked %d journal_heads!\n", n);
#endif
remove_jbd_proc_entry();
jbd_remove_debugfs_entry();
journal_destroy_caches();
}

2
include/linux/jbd.h
View File

@ -58,7 +58,7 @@
* CONFIG_JBD_DEBUG is on.
*/
#define JBD_EXPENSIVE_CHECKING
extern int journal_enable_debug;
extern u8 journal_enable_debug;
#define jbd_debug(n, f, a...) \
do { \