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Petersen" , linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, David Sterba , Josef Bacik Cc: Johannes Thumshirn , Shinichiro Kawasaki , Naohiro Aota Subject: [PATCH 3/4] btrfs: zoned: fail mount if the device does not support zone append Date: Fri, 16 Apr 2021 12:05:27 +0900 Message-Id: <20210416030528.757513-4-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210416030528.757513-1-damien.lemoal@wdc.com> References: <20210416030528.757513-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Johannes Thumshirn For zoned btrfs, zone append is mandatory to write to a sequential write only zone, otherwise parallel writes to the same zone could result in unaligned write errors. If a zoned block device does not support zone append (e.g. a dm-crypt zoned device using a non-NULL IV cypher), fail to mount. Signed-off-by: Johannes Thumshirn Signed-off-by: Damien Le Moal --- fs/btrfs/zoned.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index eeb3ebe11d7a..70b23a0d03b1 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -342,6 +342,13 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device) if (!IS_ALIGNED(nr_sectors, zone_sectors)) zone_info->nr_zones++; + if (bdev_is_zoned(bdev) && zone_info->max_zone_append_size == 0) { + btrfs_err(fs_info, "zoned: device %pg does not support zone append", + bdev); + ret = -EINVAL; + goto out; + } + zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL); if (!zone_info->seq_zones) { ret = -ENOMEM; -- 2.30.2