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Wong" , Naohiro Aota , Josef Bacik Subject: [PATCH v10 06/41] btrfs: introduce max_zone_append_size Date: Tue, 10 Nov 2020 20:26:09 +0900 Message-Id: <173cd5def63acdf094a3b83ce129696c26fd3a3c.1605007036.git.naohiro.aota@wdc.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org The zone append write command has a maximum IO size restriction it accepts. This is because a zone append write command cannot be split, as we ask the device to place the data into a specific target zone and the device responds with the actual written location of the data. Introduce max_zone_append_size to zone_info and fs_info to track the value, so we can limit all I/O to a zoned block device that we want to write using the zone append command to the device's limits. Reviewed-by: Josef Bacik Signed-off-by: Naohiro Aota --- fs/btrfs/ctree.h | 3 +++ fs/btrfs/zoned.c | 17 +++++++++++++++-- fs/btrfs/zoned.h | 1 + 3 files changed, 19 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 453f41ca024e..c70d3fcc62c2 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -954,6 +954,9 @@ struct btrfs_fs_info { u64 zoned; }; + /* Max size to emit ZONE_APPEND write command */ + u64 max_zone_append_size; + #ifdef CONFIG_BTRFS_FS_REF_VERIFY spinlock_t ref_verify_lock; struct rb_root block_tree; diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index 1223d5b0e411..2897432eb43c 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -48,6 +48,7 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device) { struct btrfs_zoned_device_info *zone_info = NULL; struct block_device *bdev = device->bdev; + struct request_queue *queue = bdev_get_queue(bdev); sector_t nr_sectors = bdev->bd_part->nr_sects; sector_t sector = 0; struct blk_zone *zones = NULL; @@ -69,6 +70,8 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device) ASSERT(is_power_of_2(zone_sectors)); zone_info->zone_size = (u64)zone_sectors << SECTOR_SHIFT; zone_info->zone_size_shift = ilog2(zone_info->zone_size); + zone_info->max_zone_append_size = + (u64)queue_max_zone_append_sectors(queue) << SECTOR_SHIFT; zone_info->nr_zones = nr_sectors >> ilog2(bdev_zone_sectors(bdev)); if (!IS_ALIGNED(nr_sectors, zone_sectors)) zone_info->nr_zones++; @@ -188,6 +191,7 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info) u64 zoned_devices = 0; u64 nr_devices = 0; u64 zone_size = 0; + u64 max_zone_append_size = 0; const bool incompat_zoned = btrfs_is_zoned(fs_info); int ret = 0; @@ -201,10 +205,13 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info) model = bdev_zoned_model(device->bdev); if (model == BLK_ZONED_HM || (model == BLK_ZONED_HA && incompat_zoned)) { + struct btrfs_zoned_device_info *zone_info = + device->zone_info; + zoned_devices++; if (!zone_size) { - zone_size = device->zone_info->zone_size; - } else if (device->zone_info->zone_size != zone_size) { + zone_size = zone_info->zone_size; + } else if (zone_info->zone_size != zone_size) { btrfs_err(fs_info, "zoned: unequal block device zone sizes: have %llu found %llu", device->zone_info->zone_size, @@ -212,6 +219,11 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info) ret = -EINVAL; goto out; } + if (!max_zone_append_size || + (zone_info->max_zone_append_size && + zone_info->max_zone_append_size < max_zone_append_size)) + max_zone_append_size = + zone_info->max_zone_append_size; } nr_devices++; } @@ -255,6 +267,7 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info) } fs_info->zone_size = zone_size; + fs_info->max_zone_append_size = max_zone_append_size; btrfs_info(fs_info, "zoned mode enabled with zone size %llu", fs_info->zone_size); diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h index bcb1cb99a4f3..52aa6af5d8dc 100644 --- a/fs/btrfs/zoned.h +++ b/fs/btrfs/zoned.h @@ -13,6 +13,7 @@ struct btrfs_zoned_device_info { */ u64 zone_size; u8 zone_size_shift; + u64 max_zone_append_size; u32 nr_zones; unsigned long *seq_zones; unsigned long *empty_zones; -- 2.27.0