From: Theodore Ts'o <tytso@mit.edu>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: linux-ext4@vger.kernel.org
Subject: Re: [PATCH 10/18] e2fsck: write dir blocks after new inode when reconstructing root/lost+found
Date: Sat, 26 Jul 2014 17:18:46 -0400 [thread overview]
Message-ID: <20140726211846.GS6725@thunk.org> (raw)
In-Reply-To: <20140726003441.28334.28347.stgit@birch.djwong.org>
On Fri, Jul 25, 2014 at 05:34:41PM -0700, Darrick J. Wong wrote:
> If we trash the root directory block, e2fsck will find inode 11 (the
> old lost+found) and try to attach it to l+f. The lost+found checker
> also fails to find l+f and tries to add one to the root dir. The root
> dir is not found but is recreated with incorrect checksums, so linking
> in the l+f dir fails and the l+f '..' entry isn't set. Since both
> dirs now fail checksum verification, they're both referred to rehash
> to have that fixed, but because l+f doesn't have a '..' entry, rehash
> crashes because l+f has < 2 entries.
>
> On a checksumming filesystem, the routines in e2fsck that recreate
> /lost+found and / must write the new directory block *after* the inode
> has been written to disk because the checksum depends on i_generation.
> Add a regression test while we're at it.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Thanks, applied.
- Ted
next prev parent reply other threads:[~2014-07-26 21:18 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-26 0:33 [PATCH 00/18] e2fsprogs patchbomb 7/14, part 2 Darrick J. Wong
2014-07-26 0:33 ` [PATCH 01/18] e2fsck: reserve blocks for root/lost+found directory repair Darrick J. Wong
2014-07-26 19:47 ` Theodore Ts'o
2014-07-28 7:27 ` Darrick J. Wong
2014-07-26 0:33 ` [PATCH 02/18] e2fsck: fix merge error in "clear uninit flag on directory extents" Darrick J. Wong
2014-07-26 20:04 ` Theodore Ts'o
2014-07-26 0:33 ` [PATCH 03/18] e2fsck: perform implied cluster allocations when filling a directory hole Darrick J. Wong
2014-07-26 20:08 ` Theodore Ts'o
2014-07-26 0:34 ` [PATCH 04/18] e2fsck: fix rule-violating lblk->pblk mappings on bigalloc filesystems Darrick J. Wong
2014-07-26 6:02 ` Andreas Dilger
2014-07-26 20:27 ` Theodore Ts'o
2014-07-28 8:28 ` Darrick J. Wong
2014-07-28 17:55 ` Darrick J. Wong
2014-07-28 19:32 ` Theodore Ts'o
2014-07-26 0:34 ` [PATCH 05/18] e2fsck: during pass1b delete_file, only free a cluster once Darrick J. Wong
2014-07-26 20:30 ` Theodore Ts'o
2014-07-26 0:34 ` [PATCH 06/18] dumpe2fs: add switch to disable checksum verification Darrick J. Wong
2014-07-26 20:58 ` Theodore Ts'o
2014-07-28 7:48 ` Darrick J. Wong
2014-07-26 0:34 ` [PATCH 07/18] e2fsck: verify checksums after checking everything else Darrick J. Wong
2014-07-26 20:53 ` Theodore Ts'o
2014-07-28 8:27 ` Darrick J. Wong
2014-07-26 0:34 ` [PATCH 08/18] e2fsck: fix the various checksum error messages Darrick J. Wong
2014-07-26 21:09 ` Theodore Ts'o
2014-07-28 7:57 ` Darrick J. Wong
2014-07-26 0:34 ` [PATCH 09/18] e2fsck: insert a missing dirent tail for checksums if possible Darrick J. Wong
2014-07-26 21:13 ` Theodore Ts'o
2014-07-26 0:34 ` [PATCH 10/18] e2fsck: write dir blocks after new inode when reconstructing root/lost+found Darrick J. Wong
2014-07-26 21:18 ` Theodore Ts'o [this message]
2014-07-26 0:34 ` [PATCH 11/18] libext2/fsck: correctly preserve fs flags when modifying ignore-csum-error flag Darrick J. Wong
2014-07-27 23:27 ` Theodore Ts'o
2014-07-28 8:06 ` Darrick J. Wong
2014-07-26 0:34 ` [PATCH 12/18] e2fsck: toggle checksum verification error reporting appropriately Darrick J. Wong
2014-07-27 23:37 ` Theodore Ts'o
2014-07-28 7:38 ` Darrick J. Wong
2014-07-28 11:41 ` Theodore Ts'o
2014-07-26 0:34 ` [PATCH 13/18] libext2fs: Don't cache inodes that fail checksum verification Darrick J. Wong
2014-07-26 0:35 ` [PATCH 14/18] e2fsck: always recheck an inode checksum failure Darrick J. Wong
2014-07-26 0:35 ` [PATCH 15/18] e2fsck: clear badblocks inode when checksum fails Darrick J. Wong
2014-07-27 23:42 ` Theodore Ts'o
2014-07-26 0:35 ` [PATCH 16/18] e2fsck: leave room for checksum structure when salvaging a directory Darrick J. Wong
2014-07-27 23:45 ` Theodore Ts'o
2014-07-26 0:35 ` [PATCH 17/18] e2fsck: make insert_dirent_tail more robust Darrick J. Wong
2014-07-27 23:48 ` Theodore Ts'o
2014-07-26 0:35 ` [PATCH 18/18] e2fsck: don't offer to fix the checksum of fixed extents Darrick J. Wong
2014-07-27 23:52 ` Theodore Ts'o
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