From c2a9159cdd8b334a0dfaf69d8b07cd57b5272baa Mon Sep 17 00:00:00 2001 From: "Jose R. Santos" Date: Thu, 18 Oct 2007 23:39:22 -0700 Subject: [PATCH] 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 Acked-by: Jan Kara Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/Kconfig | 10 +++---- fs/jbd/journal.c | 64 +++++++++++++++------------------------------ include/linux/jbd.h | 2 +- 3 files changed, 27 insertions(+), 49 deletions(-) diff --git a/fs/Kconfig b/fs/Kconfig index e31f3691b1..cc28a69246 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -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 diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c index f810047a71..5d14243499 100644 --- a/fs/jbd/journal.c +++ b/fs/jbd/journal.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include @@ -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(); } diff --git a/include/linux/jbd.h b/include/linux/jbd.h index d77f67d954..16e7ed855a 100644 --- a/include/linux/jbd.h +++ b/include/linux/jbd.h @@ -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 { \ -- 2.39.5