Re: [BUG?]Set XIP mount option on ext2 bypass check.

[Carsten Otte <cotte@de.ibm.com>]

Yan Zheng wrote:
> I mount an ext2 fs , then remount it with xip option set.
> I get message below when do write operation in the fs.
Ouch. Like on mount, we should refuse -o xip on remount. The patch 
below fixes this issue.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
---
Index: linux-2.6.22-rc4-mm/fs/ext2/super.c
===================================================================
--- linux-2.6.22-rc4-mm.orig/fs/ext2/super.c
+++ linux-2.6.22-rc4-mm/fs/ext2/super.c
@@ -1071,6 +1071,9 @@ static int ext2_remount (struct super_bl
  	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
  		((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);

+	ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
+				    EXT2_MOUNT_XIP if not */
+
  	es = sbi->s_es;
  	if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
  	    (old_mount_opt & EXT2_MOUNT_XIP)) &&