ext4: use non-racy method for proc entries creation

Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data
be setup before gluing PDE to main tree.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Cc: <linux-ext4@vger.kernel.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 11 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 1efcb934c2d6..9d57695de746 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2449,17 +2449,10 @@ static void ext4_mb_history_init(struct super_block *sb)
         int i;
 
         if (sbi->s_mb_proc != NULL) {
-                struct proc_dir_entry *p;
-                p = create_proc_entry("mb_history", S_IRUGO, sbi->s_mb_proc);
-                if (p) {
-                        p->proc_fops = &ext4_mb_seq_history_fops;
-                        p->data = sb;
-                }
-                p = create_proc_entry("mb_groups", S_IRUGO, sbi->s_mb_proc);
-                if (p) {
-                        p->proc_fops = &ext4_mb_seq_groups_fops;
-                        p->data = sb;
-                }
+                proc_create_data("mb_history", S_IRUGO, sbi->s_mb_proc,
+                                 &ext4_mb_seq_history_fops, sb);
+                proc_create_data("mb_groups", S_IRUGO, sbi->s_mb_proc,
+                                 &ext4_mb_seq_groups_fops, sb);
         }
 
         sbi->s_mb_history_max = 1000;