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From: Qu Wenruo <quwenruo.btrfs@gmx.com>
To: Nikolay Borisov <nborisov@suse.com>,
	Anand Jain <anand.jain@oracle.com>,
	linux-btrfs@vger.kernel.org
Cc: wqu@suse.com, dsterba@suse.com
Subject: Re: [PATCH 1/2] btrfs: drop never met condition of disk_total_bytes == 0
Date: Thu, 24 Sep 2020 20:19:02 +0800	[thread overview]
Message-ID: <ffc60c8f-3045-640b-bed9-07001287470a@gmx.com> (raw)
In-Reply-To: <b879f134-5bf9-a28a-885a-750d39f29a63@gmx.com>



On 2020/9/24 下午7:58, Qu Wenruo wrote:
>
>
> On 2020/9/24 下午7:48, Nikolay Borisov wrote:
>>
>>
>> On 24.09.20 г. 13:11 ч., Anand Jain wrote:
>>> btrfs_device::disk_total_bytes is set even for a seed device (the
>>> comment is wrong).
>>>
>>> The function fill_device_from_item() does the job of reading it from the
>>> item and updating btrfs_device::disk_total_bytes. So both the missing
>>> device and the seed devices do have their disk_total_bytes updated.
>>>
>>> So this patch removes the check dev->disk_total_bytes == 0 in the
>>> function verify_one_dev_extent()
>>>
>>> Signed-off-by: Anand Jain <anand.jain@oracle.com>
>>> ---
>>>  fs/btrfs/volumes.c | 15 ---------------
>>>  1 file changed, 15 deletions(-)
>>>
>>> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
>>> index 7f43ed88fffc..9be40eece8ed 100644
>>> --- a/fs/btrfs/volumes.c
>>> +++ b/fs/btrfs/volumes.c
>>> @@ -7578,21 +7578,6 @@ static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
>>>  		goto out;
>>>  	}
>>>
>>> -	/* It's possible this device is a dummy for seed device */
>>> -	if (dev->disk_total_bytes == 0) {
>>> -		struct btrfs_fs_devices *devs;
>>> -
>>> -		devs = list_first_entry(&fs_info->fs_devices->seed_list,
>>> -					struct btrfs_fs_devices, seed_list);
>>> -		dev = btrfs_find_device(devs, devid, NULL, NULL, false);
>>> -		if (!dev) {
>>> -			btrfs_err(fs_info, "failed to find seed devid %llu",
>>> -				  devid);
>>> -			ret = -EUCLEAN;
>>> -			goto out;
>>> -		}
>>> -	}
>>
>> The commit which introduced this check states that the device with a
>> disk_total_bytes = 0 occurs from clone_fs_devices called from open_seed.
>> It seems the check is legit and your changelog doesn't account for that
>> if it's safe you should provide description why is that.
>
> And it would be even better to mention the fragmentation problem in the
> man page for btrfs-convert.
>
> The fragmentation problem is a little too complex to explain in the
> error message nor usage.

Please ignore this, I replied to the wrong thread...

>
> Thanks,
> Qu
>>
>>> -
>>>  	if (physical_offset + physical_len > dev->disk_total_bytes) {
>>>  		btrfs_err(fs_info,
>>>  "dev extent devid %llu physical offset %llu len %llu is beyond device boundary %llu",
>>>

  reply	other threads:[~2020-09-24 12:19 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-24 10:11 [PATCH 0/2] fix verify_one_dev_extent and btrfs_find_device Anand Jain
2020-09-24 10:11 ` [PATCH 1/2] btrfs: drop never met condition of disk_total_bytes == 0 Anand Jain
2020-09-24 11:48   ` Nikolay Borisov
2020-09-24 11:58     ` Qu Wenruo
2020-09-24 12:19       ` Qu Wenruo [this message]
2020-09-25  4:17     ` Anand Jain
2020-09-25  6:19       ` Nikolay Borisov
2020-09-25  7:33         ` Anand Jain
2020-09-25  7:56           ` Nikolay Borisov
2020-09-25  8:12             ` Anand Jain
2020-10-05 13:22   ` Josef Bacik
2020-10-06 12:53     ` Anand Jain
2020-10-06 12:54   ` [PATCH v2 " Anand Jain
2020-10-21  4:16     ` [PATCH RESEND " Anand Jain
2020-10-21 14:35     ` Josef Bacik
2020-10-22  9:40       ` Anand Jain
2020-10-29 21:30     ` Anand Jain
2020-09-24 10:11 ` [PATCH 2/2] btrfs: fix btrfs_find_device unused arg seed Anand Jain
2020-09-24 10:21   ` Nikolay Borisov
2020-09-25  8:22     ` Nikolay Borisov
2020-09-25  8:42       ` Anand Jain
2020-10-05 13:23   ` Josef Bacik
2020-10-21  4:16   ` [PATCH RESEND " Anand Jain
2020-10-29 21:30   ` [PATCH RESEND v2 " Anand Jain
2020-10-02  3:14 ` [PATCH 0/2] fix verify_one_dev_extent and btrfs_find_device Anand Jain
2020-10-21  4:16 ` [PATCH RESEND " Anand Jain
2020-10-29 21:02 ` David Sterba
2020-10-29 21:14   ` Anand Jain
2020-11-11 15:49     ` David Sterba
2020-10-29 21:30 ` Anand Jain

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