1 files changed, 22 insertions, 45 deletions

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 5d9fec0b7ebd..5d14243499d4 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -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>
@@ -654,10 +655,9 @@ static journal_t * journal_init_common (void)
         journal_t *journal;
         int err;
 
-        journal = kmalloc(sizeof(*journal), GFP_KERNEL);
+        journal = kzalloc(sizeof(*journal), GFP_KERNEL);
         if (!journal)
                 goto fail;
-        memset(journal, 0, sizeof(*journal));
 
         init_waitqueue_head(&journal->j_wait_transaction_locked);
         init_waitqueue_head(&journal->j_wait_logspace);
@@ -1852,64 +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;
@@ -1966,7 +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;
 }
 
@@ -1977,7 +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();
 }