new helper: iterate_supers()

... and switch the simple "loop over superblocks and do something"
loops to it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 8 insertions, 16 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index ded29b0fdac3..2914d9adfb50 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -560,25 +560,17 @@ repeat:
         return err;
 }
 
-static void do_thaw_all(struct work_struct *work)
+static void do_thaw_one(struct super_block *sb, void *unused)
 {
-        struct super_block *sb, *n;
         char b[BDEVNAME_SIZE];
+        while (sb->s_bdev && !thaw_bdev(sb->s_bdev, sb))
+                printk(KERN_WARNING "Emergency Thaw on %s\n",
+                       bdevname(sb->s_bdev, b));
+}
 
-        spin_lock(&sb_lock);
-        list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
-                if (list_empty(&sb->s_instances))
-                        continue;
-                sb->s_count++;
-                spin_unlock(&sb_lock);
-                down_read(&sb->s_umount);
-                while (sb->s_bdev && !thaw_bdev(sb->s_bdev, sb))
-                        printk(KERN_WARNING "Emergency Thaw on %s\n",
-                               bdevname(sb->s_bdev, b));
-                up_read(&sb->s_umount);
-                spin_lock(&sb_lock);
-        }
-        spin_unlock(&sb_lock);
+static void do_thaw_all(struct work_struct *work)
+{
+        iterate_supers(do_thaw_one, NULL);
         kfree(work);
         printk(KERN_WARNING "Emergency Thaw complete\n");
 }