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Commit c2a9159c authored by Jose R. Santos's avatar Jose R. Santos Committed by Linus Torvalds
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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: default avatarJose R. Santos <jrs@us.ibm.com>
Acked-by: default avatarJan Kara <jack@suse.cz>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1c099244

fs/Kconfig

+5 −5
Original line number Diff line number Diff line
@@ -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

fs/jbd/journal.c

+21 −43
Original line number Diff line number Diff line
@@ -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>
@@ -1851,64 +1852,41 @@ void journal_put_journal_head(struct journal_head *jh) 
}



/*

 * /proc tunables

 * debugfs tunables

 */

#if defined(CONFIG_JBD_DEBUG)

int journal_enable_debug;

EXPORT_SYMBOL(journal_enable_debug);

#endif

#ifdef CONFIG_JBD_DEBUG



#if defined(CONFIG_JBD_DEBUG) && defined(CONFIG_PROC_FS)

u8 journal_enable_debug __read_mostly;

EXPORT_SYMBOL(journal_enable_debug);



static struct proc_dir_entry *proc_jbd_debug;

static struct dentry *jbd_debugfs_dir;

static struct dentry *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;

	debugfs_remove(jbd_debug);

	debugfs_remove(jbd_debugfs_dir);

}



#define JBD_PROC_NAME "sys/fs/jbd-debug"

#else



static void __init create_jbd_proc_entry(void)

static inline void jbd_create_debugfs_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)

static inline void jbd_remove_debugfs_entry(void)

{

	if (proc_jbd_debug)

		remove_proc_entry(JBD_PROC_NAME, NULL);

}



#else



#define create_jbd_proc_entry() do {} while (0)

#define remove_jbd_proc_entry() do {} while (0)



#endif



struct kmem_cache *jbd_handle_cache;
@@ -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();

}

include/linux/jbd.h

+1 −1
Original line number Diff line number Diff line
@@ -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 {								\