Re: [PATCH] btrfs: reject zoned RW mount if sectorsize is smaller than page size

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

On 2024/2/12 20:15, Johannes Thumshirn wrote:
> On 12.02.24 06:16, Qu Wenruo wrote:
>> Reported-by: HAN Yuwei <hrx@bupt.moe>
>> Link: https://lore.kernel.org/all/1ACD2E3643008A17+da260584-2c7f-432a-9e22-9d390aae84cc@bupt.moe/
>> CC: stable@vger.kernel.org # 5.10+
>> Signed-off-by: Qu Wenruo <wqu@suse.com>
>> ---
>>    fs/btrfs/disk-io.c | 3 ++-
>>    1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
>> index c3ab268533ca..85cd23aebdd6 100644
>> --- a/fs/btrfs/disk-io.c
>> +++ b/fs/btrfs/disk-io.c
>> @@ -3193,7 +3193,8 @@ int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount)
>>    	 * part of @locked_page.
>>    	 * That's also why compression for subpage only work for page aligned ranges.
>>    	 */
>> -	if (fs_info->sectorsize < PAGE_SIZE && btrfs_is_zoned(fs_info) && is_rw_mount) {
>> +	if (fs_info->sectorsize < PAGE_SIZE &&
>> +	    btrfs_fs_incompat(fs_info, ZONED) && is_rw_mount) {
>>    		btrfs_warn(fs_info,
>>    	"no zoned read-write support for page size %lu with sectorsize %u",
>>    			   PAGE_SIZE, fs_info->sectorsize);
>
> Please keep btrfs_is_zoned(fs_info) instead of using
> btrfs_fs_incompat(fs_info, ZONED).

At the time of calling, we haven't yet populate fs_info->zone_size, thus
we have to use super flags to verify if it's zoned.

If needed, I can add a comment for it.

Thanks,
Qu
>
> Otherwise,
> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>