linux-ext4 - Re: [PATCH] e2fsck: flush out the superblock and bitmaps before printing final messages

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Date:	Mon, 11 Aug 2014 13:27:39 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Dan Jacobson <jidanni@...anni.org>
Subject: Re: [PATCH] e2fsck: flush out the superblock and bitmaps before
 printing final messages

On Mon, Aug 11, 2014 at 10:09:35AM -0700, Darrick J. Wong wrote:
> 
> Looking at the strace output, it looks like a bunch of pwrite/write calls are
> returning -EBADF when it tries to write the group descriptors to a O_RDONLY
> file descriptor.
> 
> The call to ext2fs_flush() needs to be guarded by a "if (fs->flags &
> EXT2_FLAG_DIRTY)" because ext2fs_flush() unconditionally writes out the group
> descriptors.  We don't want to do that unless the FS is actually dirty, and we
> certainly don't want to do that for a RO check.

Oops, I had forgotten that we didn't have such a check inside
ext2fs_flush().

Thanks for catching this!

					- Ted
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