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Message-ID: <20070608225741.58dc7459@gara>
Date: Fri, 8 Jun 2007 22:57:41 -0500
From: "Jose R. Santos" <jrs@...ibm.com>
To: Andreas Dilger <adilger@...sterfs.com>
Cc: linux-ext4@...r.kernel.org
Subject: Re: [PATCH][RFC] JBD2: Use DebugFS for jbd2 debug config option.
On Fri, 8 Jun 2007 01:08:12 -0600
Andreas Dilger <adilger@...sterfs.com> wrote:
> On Jun 07, 2007 23:45 -0500, Jose R. Santos wrote:
> > The jbd2-debug file used to be located in /proc/sys/fs/jbd2-debug, but
> > create_proc_entry() does not do lookups on file names with more that one
> > directory deep. This causes the entry creation to fail and hence, no proc
> > file is created. This patch moves the file to /proc/jbd2-degug.
> >
> > The file could be move to /proc/fs/jbd2/jbd2-debug, but it would require
> > some minor alterations to the jbd-stats patch.
>
> I don't think we really want to be adding top-level files in /proc.
> What about using the "debugfs" filesystem (not to be confused with
> the e2fsprogs 'debugfs' command)?
How about this then? Moved the file to use debugfs as well as having
the nice effect of removing more lines than what it adds.
Signed-off-by: Jose R. Santos <jrs@...ibm.com>
---
fs/jbd2/journal.c | 62 20 + 42 - 0 !
include/linux/jbd2.h | 2 1 + 1 - 0 !
2 files changed, 21 insertions(+), 43 deletions(-)
Index: linux-2.6.22-rc4/fs/jbd2/journal.c
===================================================================
--- linux-2.6.22-rc4.orig/fs/jbd2/journal.c 2007-06-08 15:03:14.353372404 -0500
+++ linux-2.6.22-rc4/fs/jbd2/journal.c 2007-06-08 22:44:04.476375738 -0500
@@ -36,6 +36,7 @@
#include <linux/poison.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/debugfs.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@@ -2256,60 +2257,37 @@ void jbd2_journal_put_journal_head(struc
* /proc tunables
*/
#if defined(CONFIG_JBD2_DEBUG)
-int jbd2_journal_enable_debug;
+u16 jbd2_journal_enable_debug;
EXPORT_SYMBOL(jbd2_journal_enable_debug);
#endif
-#if defined(CONFIG_JBD2_DEBUG) && defined(CONFIG_PROC_FS)
+#if defined(CONFIG_JBD2_DEBUG) && defined(CONFIG_DEBUG_FS)
-static struct proc_dir_entry *proc_jbd_debug;
+#define JBD2_DEBUG_NAME "jbd2-debug"
-static int read_jbd_debug(char *page, char **start, off_t off,
- int count, int *eof, void *data)
-{
- int ret;
-
- ret = sprintf(page + off, "%d\n", jbd2_journal_enable_debug);
- *eof = 1;
- return ret;
-}
+struct dentry *jbd2_debugfs_dir, *jbd2_debug;
-static int write_jbd_debug(struct file *file, const char __user *buffer,
- unsigned long count, void *data)
+static void __init jbd2_create_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';
- jbd2_journal_enable_debug = simple_strtoul(buf, NULL, 10);
- return count;
-}
-
-#define JBD_PROC_NAME "sys/fs/jbd2-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;
- }
+ jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL);
+ if (jbd2_debugfs_dir)
+ jbd2_debug = debugfs_create_u16(JBD2_DEBUG_NAME, S_IRUGO,
+ jbd2_debugfs_dir,
+ &jbd2_journal_enable_debug);
}
-static void __exit jbd2_remove_jbd_proc_entry(void)
+static void __exit jbd2_remove_debugfs_entry(void)
{
- if (proc_jbd_debug)
- remove_proc_entry(JBD_PROC_NAME, NULL);
+ if (jbd2_debug)
+ debugfs_remove(jbd2_debug);
+ if (jbd2_debugfs_dir)
+ debugfs_remove(jbd2_debugfs_dir);
}
#else
-#define create_jbd_proc_entry() do {} while (0)
-#define jbd2_remove_jbd_proc_entry() do {} while (0)
+#define jbd2_create_debugfs_entry() do {} while (0)
+#define jbd2_remove_debugfs_entry() do {} while (0)
#endif
@@ -2391,7 +2369,7 @@ static int __init journal_init(void)
ret = journal_init_caches();
if (ret != 0)
jbd2_journal_destroy_caches();
- create_jbd_proc_entry();
+ jbd2_create_debugfs_entry();
jbd2_create_jbd_stats_proc_entry();
return ret;
}
@@ -2403,7 +2381,7 @@ static void __exit journal_exit(void)
if (n)
printk(KERN_EMERG "JBD: leaked %d journal_heads!\n", n);
#endif
- jbd2_remove_jbd_proc_entry();
+ jbd2_remove_debugfs_entry();
jbd2_remove_jbd_stats_proc_entry();
jbd2_journal_destroy_caches();
}
Index: linux-2.6.22-rc4/include/linux/jbd2.h
===================================================================
--- linux-2.6.22-rc4.orig/include/linux/jbd2.h 2007-06-08 18:01:41.027527067 -0500
+++ linux-2.6.22-rc4/include/linux/jbd2.h 2007-06-08 18:02:27.351010026 -0500
@@ -57,7 +57,7 @@
* CONFIG_JBD2_DEBUG is on.
*/
#define JBD_EXPENSIVE_CHECKING
-extern int jbd2_journal_enable_debug;
+extern u16 jbd2_journal_enable_debug;
#define jbd_debug(n, f, a...) \
do { \
-JRS
-
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