Re: [PATCH] XFS fix remount rw with unrecognized options

From: Jianjun Kong
Date: Thu Oct 16 2008 - 09:47:50 EST

On Thu, Oct 16, 2008 at 11:29:26AM +1100, Tim Shimmin wrote:
>Resending as I mangled sending the mail from home last time. Sorry.
>Please include the following patch for stable release as
>suggested by Christoph Hellwig and Eric Sandeen.
>It fixes a regression in the recent remount recoding
>where remounting say from ro to rw allows the xfs flags to
>be out of sync with the vfs flags, resulting
>in failures for some programs such as touch (which end up calling xfs_setattr).
>The fix is a very minor and clear.
>Date: Sun, 12 Oct 2008 14:30:44 +0200
>From: Christoph Hellwig <hch@xxxxxx>
>To: xfs@xxxxxxxxxxx
>Subject: [PATCH] fix remount rw with unrecognized options
>When we skip unrecognized options in xfs_fs_remount we should just break
>out of the switch and not return because otherwise we may skip clearing
>the xfs-internal read-only flag. This will only show up on some
>operations like touch because most read-only checks are done by the VFS
>which thinks this filesystem is r/w. Eventually we should replace the
>XFS read-only flag with a helper that always checks the VFS flag to make
>sure they can never get out of sync.
>Bug reported and fix verified by Marcel Beister on #xfs.
>Bug fix verified by updated xfstests/189.
>Signed-off-by: Christoph Hellwig <hch@xxxxxx>
>Acked-by: Eric Sandeen <sandeen@xxxxxxxxxxx>
>Signed-off-by: Timothy Shimmin <tes@xxxxxxx>
>Index: mainline/fs/xfs/linux-2.6/xfs_super.c
>--- mainline.orig/fs/xfs/linux-2.6/xfs_super.c 2008-10-15 17:59:26.542652847 +1100
>+++ mainline/fs/xfs/linux-2.6/xfs_super.c 2008-10-15 17:59:45.376217172 +1100
>@@ -1323,7 +1323,7 @@ xfs_fs_remount(
> "XFS: mount option \"%s\" not supported for remount\n", p);
> return -EINVAL;
> #else
>- return 0;
>+ break;
> #endif
> }
> }

And the code above "return 0" can not be executed, so delete them.
#if 0
"XFS: mount option \"%s\" not supported for remount\n", p);
return -EINVAL;
return 0;

Signed-off-by: Jianjun Kong <kongjianjun@xxxxxxxxx>
fs/xfs/linux-2.6/xfs_super.c | 7 +------
1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index e390136..bd5ec81 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1318,12 +1318,7 @@ xfs_fs_remount(
* every remount request, and silently ignore all
* options that we can't actually change.
-#if 0
- printk(KERN_INFO
- "XFS: mount option \"%s\" not supported for remount\n", p);
- return -EINVAL;
- break;
+ break 0;

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