[PATCH] writeback_inodes can race with unmount

[Chris Mason <mason@suse.com>]

There's a small window where the filesystem can be unmounted during
writeback_inodes.  The end result is the iput done by sync_sb_inodes
could be done after the FS put_super and and the super has been removed
from all lists.

The fix is to hold the s_umount sem during sync_sb_inodes to make sure
the FS doesn't get unmounted.

Index: linux.t/fs/fs-writeback.c
===================================================================
--- linux.t.orig/fs/fs-writeback.c	2004-06-08 14:45:49.000000000 -0400
+++ linux.t/fs/fs-writeback.c	2004-06-08 14:47:58.000000000 -0400
@@ -360,9 +360,18 @@ restart:
 	sb = sb_entry(super_blocks.prev);
 	for (; sb != sb_entry(&super_blocks); sb = sb_entry(sb->s_list.prev)) {
 		if (!list_empty(&sb->s_dirty) || !list_empty(&sb->s_io)) {
+			/* we're making our own get_super here */
 			sb->s_count++;
 			spin_unlock(&sb_lock);
-			sync_sb_inodes(sb, wbc);
+			/* if we can't get the readlock, there's no sense in
+			 * waiting around, most of the time the FS is going
+			 * to be unmounted by the time it is released
+			 */
+			if (down_read_trylock(&sb->s_umount)) {
+				if (sb->s_root)
+					sync_sb_inodes(sb, wbc);
+				up_read(&sb->s_umount);
+			}
 			spin_lock(&sb_lock);
 			if (__put_super(sb))
 				goto restart;