From: Qu Wenruo <quwenruo.btrfs@gmx.com>
To: "Su Yanjun <suyj.fnst@cn.fujitsu.com>" <suyj.fnst@cn.fujitsu.com>,
Su Yue <suy.fnst@cn.fujitsu.com>,
linux-btrfs@vger.kernel.org
Subject: Re: [PATCH 11/13] btrfs-progs: check: Delete file extent item with unaligned extent backref
Date: Wed, 7 Nov 2018 15:13:00 +0800 [thread overview]
Message-ID: <ea4e1ca2-25f8-6aa0-7f19-025806cc41f4@gmx.com> (raw)
In-Reply-To: <05530906-9f07-0f36-baa5-ccbef423c632@cn.fujitsu.com>
On 2018/11/7 下午3:04, Su Yanjun <suyj.fnst@cn.fujitsu.com> wrote:
>
>
> On 11/7/2018 2:38 PM, Qu Wenruo wrote:
>>
>> On 2018/11/7 下午2:21, Su Yanjun <suyj.fnst@cn.fujitsu.com> wrote:
>>>
>>> On 10/24/2018 8:45 AM, Qu Wenruo wrote:
>>>> On 2018/10/23 下午5:41, Su Yue wrote:
>>>>> From: Su Yanjun <suyj.fnst@cn.fujitsu.com>
>>>>>
>>>>> In original mode, if some file extent item has unaligned extent
>>>>> backref,
>>>>> fixup_extent_refs can't repair it. This patch will check extent
>>>>> alignment
>>>>> then delete file extent with unaligned extent backref.
>>>> This looks a little strange to me.
>>>>
>>>> You mean, an unaligned FILE EXTENT has an unaligned EXTENT_ITEM?
>>>>
>>>> Then why not just delete the EXTENT_ITEM directly? No need to go back
>>>> checking if it has a corresponding EXTENT_DATA since unaligned one is
>>>> definitely corrupted.
>>>>
>>>> For corrupted EXTENT_DATA, it should get deleted when we check fs tree.
>>>>
>>>> This would save you a lot of codes.
>>>>
>>>> Thanks,
>>>> Qu
>>> The situation is that the file extent has wrong extent backref, actually
>>> it doesn't exist.
>> Did you mean extent EXTENT_ITEM key's objectid is unaligned?
>>
>> Would you please give an example on this case? Like:
>> (<ino> EXTENT_DATA <offset>
>> disk bytenr <XXXX> disk len <YYYY>
>>
>> And its backref like:
>> (<XXXX> EXTENT_ITEM <YYYY>)
>>
>> And then mark where the number is incorrect.
>>
>> Thanks,
>> Qu
>
> As in /btrfs-progs/tests/fsck-tests/001-bad-file-extent-bytenr case:
>
> item 7 key (257 EXTENT_DATA 0) itemoff 3453 itemsize 53
>
> generation 6 type 1 (regular)
>
> extent data disk byte 755944791 nr 1048576
> ^^^^^^^^^
>
> extent data offset 0 nr 1048576 ram 1048576
>
> extent compression 0 (none)
Then there is no "unaligned extent backref".
It's just a unaligned disk bytenr of a file extent.
Nothing to do with backref.
Please update the commit message to avoid such confusing words, and
include above info, which is pretty easy to understand.
Thanks,
Qu
>
> Thanks,
>
> Su
>
>>> Thanks,
>>> Su
>>>
>>>
>>>
>>>
>>>
>>
>
>
>
next prev parent reply other threads:[~2018-11-07 7:13 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-23 9:41 [PATCH 00/13] btrfs-progs: fixes of file extent in original and lowmem check Su Yue
2018-10-23 9:41 ` [PATCH 01/13] btrfs-progs: lowmem: add argument path to punch_extent_hole() Su Yue
2018-10-23 10:04 ` Qu Wenruo
2018-10-24 1:18 ` Su Yue
2018-12-02 14:34 ` [PATCH v2 " damenly.su
2018-10-23 9:41 ` [PATCH 02/13] btrfs-progs: lowmem: move nbytes check before isize check Su Yue
2018-10-23 10:07 ` Qu Wenruo
2018-12-02 14:38 ` [PATCH v2 " damenly.su
2018-10-23 9:41 ` [PATCH 03/13] btrfs-progs: lowmem: fix false alert if extent item has been repaired Su Yue
2018-10-23 10:30 ` Qu Wenruo
2018-10-24 1:27 ` Su Yue
2018-10-24 1:24 ` Qu Wenruo
2018-12-02 14:45 ` [PATCH v2 " damenly.su
2018-10-23 9:41 ` [PATCH 04/13] btrfs-progs: lowmem: fix false alert about the existence of gaps in the check_file_extent Su Yue
2018-10-24 0:13 ` Qu Wenruo
2018-10-23 9:41 ` [PATCH 05/13] btrfs-progs: lowmem: check unaligned disk_bytenr for extent_data Su Yue
2018-10-24 0:13 ` Qu Wenruo
2018-10-23 9:41 ` [PATCH 06/13] btrfs-progs: lowmem: rename delete_extent_tree_item() to delete_item() Su Yue
2018-10-24 0:15 ` Qu Wenruo
2018-10-23 9:41 ` [PATCH 07/13] btrfs-progs: lowmem: delete unaligned bytes extent data under repair Su Yue
2018-10-24 0:16 ` Qu Wenruo
2018-10-23 9:41 ` [PATCH 08/13] btrfs-progs: Revert "btrfs-progs: Add repair and report function for orphan file extent." Su Yue
2018-10-24 0:28 ` Qu Wenruo
2018-10-23 9:41 ` [PATCH 09/13] btrfs-progs: Revert "btrfs-progs: Record orphan data extent ref to corresponding root." Su Yue
2018-10-24 0:29 ` Qu Wenruo
2018-11-07 9:09 ` Su Yanjun <suyj.fnst@cn.fujitsu.com>
2018-11-07 9:14 ` Qu Wenruo
2018-10-23 9:41 ` [PATCH 10/13] btrfs-progs: check: fix bug in find_possible_backrefs Su Yue
2018-10-24 0:34 ` Qu Wenruo
2018-11-07 6:28 ` Su Yanjun <suyj.fnst@cn.fujitsu.com>
2018-11-07 6:40 ` Qu Wenruo
2018-10-23 9:41 ` [PATCH 11/13] btrfs-progs: check: Delete file extent item with unaligned extent backref Su Yue
2018-10-24 0:45 ` Qu Wenruo
2018-11-07 6:21 ` Su Yanjun <suyj.fnst@cn.fujitsu.com>
2018-11-07 6:38 ` Qu Wenruo
2018-11-07 7:04 ` Su Yanjun <suyj.fnst@cn.fujitsu.com>
2018-11-07 7:13 ` Qu Wenruo [this message]
2018-10-23 9:41 ` [PATCH 12/13] btrfs-progs: tests: add case for inode lose one file extent Su Yue
2018-10-23 9:41 ` [PATCH 13/13] btrfs-progs: fsck-test: enable lowmem repair for case 001 Su Yue
2018-10-23 9:45 ` [PATCH 00/13] btrfs-progs: fixes of file extent in original and lowmem check Qu Wenruo
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