jbd2: 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>

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 954cff0..eb7eb6c 100644 (file)
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -904,19 +904,10 @@ static void jbd2_stats_proc_init(journal_t *journal)
        snprintf(name, sizeof(name) - 1, "%s", bdevname(journal->j_dev, name));
        journal->j_proc_entry = proc_mkdir(name, proc_jbd2_stats);
        if (journal->j_proc_entry) {
-               struct proc_dir_entry *p;
-               p = create_proc_entry("history", S_IRUGO,
-                               journal->j_proc_entry);
-               if (p) {
-                       p->proc_fops = &jbd2_seq_history_fops;
-                       p->data = journal;
-                       p = create_proc_entry("info", S_IRUGO,
-                                               journal->j_proc_entry);
-                       if (p) {
-                               p->proc_fops = &jbd2_seq_info_fops;
-                               p->data = journal;
-                       }
-               }
+               proc_create_data("history", S_IRUGO, journal->j_proc_entry,
+                                &jbd2_seq_history_fops, journal);
+               proc_create_data("info", S_IRUGO, journal->j_proc_entry,
+                                &jbd2_seq_info_fops, journal);
        }
 }