From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH 1/2] push MS_RDONLY check from ->write_super into caller
Date: Wed, 6 May 2009 23:19:12 +0100
Message-ID: <20090506221912.GX8633@ZenIV.linux.org.uk>
References: <20090506201605.GA19043@lst.de>
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Cc: linux-fsdevel@vger.kernel.org
To: Christoph Hellwig <hch@lst.de>
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On Wed, May 06, 2009 at 10:16:05PM +0200, Christoph Hellwig wrote:
> Add a central MS_RDONLY to sync_super instead of having it in the ->write_super
> methods (and even that not consistently).  The other two callers are already
> protected:  sync_filesystems has the same s_umount protected MS_RDONLY check
> and file_fsync can only be called on a writeable file descriptor.
> 
> Also make sure to clear s_dirt if it was set on a read-only superblock to
> avoid calling into these filesystems again and again.

> Index: vfs-2.6/fs/affs/super.c
> Index: vfs-2.6/fs/bfs/inode.c
> Index: vfs-2.6/fs/ext2/super.c
> Index: vfs-2.6/fs/fat/inode.c
> Index: vfs-2.6/fs/hfs/super.c
> Index: vfs-2.6/fs/hfsplus/super.c
> Index: vfs-2.6/fs/jffs2/fs.c
> Index: vfs-2.6/fs/jffs2/super.c
> Index: vfs-2.6/fs/nilfs2/super.c
> Index: vfs-2.6/fs/super.c
> Index: vfs-2.6/fs/sysv/inode.c
> Index: vfs-2.6/fs/ufs/super.c

You've missed xfs.  Added and applied (reiserfs, ext4 and exofs are also
not touched, but they don't need a change here).