From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org
Subject: Re: [PATCH 4/5] ext4: don't crash when validating block bitmap
Date: Tue, 13 May 2014 15:33:47 -0700 [thread overview]
Message-ID: <20140513223347.GA17417@birch.djwong.org> (raw)
In-Reply-To: <20140512142457.GG31376@thunk.org>
On Mon, May 12, 2014 at 10:24:57AM -0400, Theodore Ts'o wrote:
> On Thu, May 01, 2014 at 04:17:47PM -0700, Darrick J. Wong wrote:
> > If EXT4FS_DEBUG is defined, ext4_validate_block_bitmap is called via
> > ext4_count_free_clusters before sb->s_group_info is set up. When this
> > happens, the kernel crashes because group info hasn't been loaded.
> > Forego marking the group corrupt for now; not setting BH_Verified
> > means we'll revisit the bitmap if something went wrong.
> >
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
>
> This shouldn't be necessary that we have this in the ext4 tree, right?
Err... right, you can drop this patch of mine.
--D
>
> commit 007649375f6af242d5b1df2c15996949714303ba
> Author: Azat Khuzhin <a3at.mail@gmail.com>
> Date: Mon Apr 7 10:54:20 2014 -0400
>
> ext4: initialize multi-block allocator before checking block descriptors
>
> With EXT4FS_DEBUG ext4_count_free_clusters() will call
> ext4_read_block_bitmap() without s_group_info initialized, so we need to
> initialize multi-block allocator before.
>
> ...
>
> - Ted
next prev parent reply other threads:[~2014-05-13 22:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 23:17 [PATCH 0/5] miscellaneous kernel ext4 fixes Darrick J. Wong
2014-05-01 23:17 ` [PATCH 1/5] ext4: Find the group descriptors on a 1k-block bigalloc, meta_bg filesystem Darrick J. Wong
2014-05-01 23:17 ` [PATCH 2/5] ext4: fix block bitmap initialization under sparse_super2 Darrick J. Wong
2014-05-12 14:16 ` Theodore Ts'o
2014-05-01 23:17 ` [PATCH 3/5] ext4: fix block bitmap validation when bigalloc, ^flex_bg Darrick J. Wong
2014-05-12 14:22 ` Theodore Ts'o
2014-05-01 23:17 ` [PATCH 4/5] ext4: don't crash when validating block bitmap Darrick J. Wong
2014-05-12 14:24 ` Theodore Ts'o
2014-05-13 22:33 ` Darrick J. Wong [this message]
2014-05-01 23:17 ` [PATCH 5/5] ext4: enforce ext5 feature set and mount options Darrick J. Wong
2014-05-02 9:47 ` Lukáš Czerner
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