linux-ext4 - Re: [PATCH v2] e2fsck: delay quotas loading in release_orphan

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Date:   Mon, 28 Aug 2023 19:07:33 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     Jan Kara <jack@...e.cz>
CC:     <linux-ext4@...r.kernel.org>, <tytso@....edu>,
        <adilger.kernel@...ger.ca>, <darrick.wong@...cle.com>,
        <yi.zhang@...wei.com>, <yangerkun@...wei.com>,
        <yukuai3@...wei.com>, Baokun Li <libaokun1@...wei.com>
Subject: Re: [PATCH v2] e2fsck: delay quotas loading in
 release_orphan_inodes()

On 2023/8/28 17:54, Jan Kara wrote:
> On Fri 25-08-23 21:22:37, Baokun Li wrote:
>> After 7d79b40b ("e2fsck: adjust quota counters when clearing orphaned
>> inodes"), we load all the quotas before we process the orphaned inodes,
>> and when we load the quotas, we check the checsum of the bbitmap for each
>> group. If one of the bbitmap checksums is wrong, the following error will
>> be reported:
>>
>> “Error initializing quota context in support library:
>>   Block bitmap checksum does not match bitmap”
>>
>> But loading quotas comes before checking the current superblock for the
>> EXT2_ERROR_FS flag, which makes it impossible to use e2fsck to repair any
>> image that contains orphan inodes and has the wrong bbitmap checksum. So
>> delaying quota loading until after the EXT2_ERROR_FS judgment avoids the
>> above problem. Moreover, since we don't care if the bitmap checksum is
>> wrong before Pass5, e2fsck_read_bitmaps() is called before loading the
>> quota to avoid bitmap checksum errors that would cause e2fsck to exit.
>>
>> Signed-off-by: Baokun Li <libaokun1@...wei.com>
>> ---
>> V1->V2:
>> 	Add e2fsck_read_bitmaps() to avoid bitmap checksum errors causing
>> 	e2fsck to exit.
> Looks good, just one nit below:
>
>> @@ -525,10 +516,18 @@ static int release_orphan_inodes(e2fsck_t ctx)
>>   	 * be running a full e2fsck run anyway... We clear orphan file contents
>>   	 * after filesystem is checked to avoid clearing someone else's data.
>>   	 */
>> -	if (fs->super->s_state & EXT2_ERROR_FS) {
>> -		if (ctx->qctx)
>> -			quota_release_context(&ctx->qctx);
>> +	if (fs->super->s_state & EXT2_ERROR_FS)
>>   		return 0;
>> +
>> +	e2fsck_read_bitmaps(ctx);
>> +
>> +	clear_problem_context(&pctx);
>> +	ino = fs->super->s_last_orphan;
>> +	pctx.ino = ino;
>> +	pctx.errcode = e2fsck_read_all_quotas(ctx);
>> +	if (pctx.errcode) {
>> +		fix_problem(ctx, PR_0_QUOTA_INIT_CTX, &pctx);
>> +		return 1;
>>   	}
>>   
>>   	if (ino && ((ino < EXT2_FIRST_INODE(fs->super)) ||
> Just a few lines below this place is another call to e2fsck_read_bitmaps()
> so you can just delete it when you are adding one here. Otherwise feel free
> to add:
>
> Reviewed-by: Jan Kara <jack@...e.cz>
>
> 								Honza
Thank you very much for your review!
I'll remove the redundant e2fsck_read_bitmaps() in the next version.

-- 
With Best Regards,
Baokun Li
.