[PATCH] Hold BKL for shorter period in generic_shutdown_super().

[Robin Holt]

Testing revealed long pauses of the entire system while autofs initiated
umounts as a result of timing out the mounts.

It was noticed that during a umount, the BKL is held while scanning
the inode_list and removing and inodes that are candidates.  This patch
moves locking until after the first pass had gone through the inode_list.

Testing revelead that on an ia64 machine with a filesystem that had
8.4 Million inodes, there were no observable pauses during the umount.
This was down from over 4 seconds without this patch.

Signed-Off-By: Robin Holt <holt@xxxxxxx>


Index: linux/fs/super.c
===================================================================
--- linux.orig/fs/super.c       2004-11-16 14:41:37.213825056 -0600
+++ linux/fs/super.c    2004-11-16 14:41:49.027032016 -0600
@@ -233,10 +233,10 @@
                dput(root);
                fsync_super(sb);
                lock_super(sb);
-               lock_kernel();
                sb->s_flags &= ~MS_ACTIVE;
                /* bad name - it should be evict_inodes() */
                invalidate_inodes(sb);
+               lock_kernel();

                if (sop->write_super && sb->s_dirt)
                        sop->write_super(sb);

-
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