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SubjectRe: [PATCH 02/19] btrfs: Get zone information of zoned block devices
On Fri, Jun 07, 2019 at 10:10:08PM +0900, Naohiro Aota wrote:
> If a zoned block device is found, get its zone information (number of zones
> and zone size) using the new helper function btrfs_get_dev_zonetypes(). To
> avoid costly run-time zone report commands to test the device zones type
> during block allocation, attach the seqzones bitmap to the device structure
> to indicate if a zone is sequential or accept random writes.
>
> This patch also introduces the helper function btrfs_dev_is_sequential() to
> test if the zone storing a block is a sequential write required zone.
>
> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
> ---
> fs/btrfs/volumes.c | 143 +++++++++++++++++++++++++++++++++++++++++++++
> fs/btrfs/volumes.h | 33 +++++++++++
> 2 files changed, 176 insertions(+)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 1c2a6e4b39da..b673178718e3 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -786,6 +786,135 @@ static int btrfs_free_stale_devices(const char *path,
> return ret;
> }
>
> +static int __btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
> + struct blk_zone **zones,
> + unsigned int *nr_zones, gfp_t gfp_mask)
> +{
> + struct blk_zone *z = *zones;
> + int ret;
> +
> + if (!z) {
> + z = kcalloc(*nr_zones, sizeof(struct blk_zone), GFP_KERNEL);
> + if (!z)
> + return -ENOMEM;
> + }
> +
> + ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT,
> + z, nr_zones, gfp_mask);
> + if (ret != 0) {
> + btrfs_err(device->fs_info, "Get zone at %llu failed %d\n",
> + pos, ret);
> + return ret;
> + }
> +
> + *zones = z;
> +
> + return 0;
> +}
> +
> +static void btrfs_destroy_dev_zonetypes(struct btrfs_device *device)
> +{
> + kfree(device->seq_zones);
> + kfree(device->empty_zones);
> + device->seq_zones = NULL;
> + device->empty_zones = NULL;
> + device->nr_zones = 0;
> + device->zone_size = 0;
> + device->zone_size_shift = 0;
> +}
> +
> +int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
> + struct blk_zone *zone, gfp_t gfp_mask)
> +{
> + unsigned int nr_zones = 1;
> + int ret;
> +
> + ret = __btrfs_get_dev_zones(device, pos, &zone, &nr_zones, gfp_mask);
> + if (ret != 0 || !nr_zones)
> + return ret ? ret : -EIO;
> +
> + return 0;
> +}
> +
> +int btrfs_get_dev_zonetypes(struct btrfs_device *device)
> +{
> + struct block_device *bdev = device->bdev;
> + sector_t nr_sectors = bdev->bd_part->nr_sects;
> + sector_t sector = 0;
> + struct blk_zone *zones = NULL;
> + unsigned int i, n = 0, nr_zones;
> + int ret;
> +
> + device->zone_size = 0;
> + device->zone_size_shift = 0;
> + device->nr_zones = 0;
> + device->seq_zones = NULL;
> + device->empty_zones = NULL;
> +
> + if (!bdev_is_zoned(bdev))
> + return 0;
> +
> + device->zone_size = (u64)bdev_zone_sectors(bdev) << SECTOR_SHIFT;
> + device->zone_size_shift = ilog2(device->zone_size);
> + device->nr_zones = nr_sectors >> ilog2(bdev_zone_sectors(bdev));
> + if (nr_sectors & (bdev_zone_sectors(bdev) - 1))
> + device->nr_zones++;
> +
> + device->seq_zones = kcalloc(BITS_TO_LONGS(device->nr_zones),
> + sizeof(*device->seq_zones), GFP_KERNEL);
> + if (!device->seq_zones)
> + return -ENOMEM;
> +
> + device->empty_zones = kcalloc(BITS_TO_LONGS(device->nr_zones),
> + sizeof(*device->empty_zones), GFP_KERNEL);
> + if (!device->empty_zones)
> + return -ENOMEM;
> +
> +#define BTRFS_REPORT_NR_ZONES 4096
> +
> + /* Get zones type */
> + while (sector < nr_sectors) {
> + nr_zones = BTRFS_REPORT_NR_ZONES;
> + ret = __btrfs_get_dev_zones(device, sector << SECTOR_SHIFT,
> + &zones, &nr_zones, GFP_KERNEL);
> + if (ret != 0 || !nr_zones) {
> + if (!ret)
> + ret = -EIO;
> + goto out;
> + }
> +
> + for (i = 0; i < nr_zones; i++) {
> + if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
> + set_bit(n, device->seq_zones);
> + if (zones[i].cond == BLK_ZONE_COND_EMPTY)
> + set_bit(n, device->empty_zones);
> + sector = zones[i].start + zones[i].len;
> + n++;
> + }
> + }
> +
> + if (n != device->nr_zones) {
> + btrfs_err(device->fs_info,
> + "Inconsistent number of zones (%u / %u)\n", n,
> + device->nr_zones);
> + ret = -EIO;
> + goto out;
> + }
> +
> + btrfs_info(device->fs_info,
> + "host-%s zoned block device, %u zones of %llu sectors\n",
> + bdev_zoned_model(bdev) == BLK_ZONED_HM ? "managed" : "aware",
> + device->nr_zones, device->zone_size >> SECTOR_SHIFT);
> +
> +out:
> + kfree(zones);
> +
> + if (ret)
> + btrfs_destroy_dev_zonetypes(device);
> +
> + return ret;
> +}
> +
> static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
> struct btrfs_device *device, fmode_t flags,
> void *holder)
> @@ -842,6 +971,11 @@ static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
> clear_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
> device->mode = flags;
>
> + /* Get zone type information of zoned block devices */
> + ret = btrfs_get_dev_zonetypes(device);
> + if (ret != 0)
> + goto error_brelse;
> +
> fs_devices->open_devices++;
> if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state) &&
> device->devid != BTRFS_DEV_REPLACE_DEVID) {
> @@ -1243,6 +1377,7 @@ static void btrfs_close_bdev(struct btrfs_device *device)
> }
>
> blkdev_put(device->bdev, device->mode);
> + btrfs_destroy_dev_zonetypes(device);
> }
>
> static void btrfs_close_one_device(struct btrfs_device *device)
> @@ -2664,6 +2799,13 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
> mutex_unlock(&fs_info->chunk_mutex);
> mutex_unlock(&fs_devices->device_list_mutex);
>
> + /* Get zone type information of zoned block devices */
> + ret = btrfs_get_dev_zonetypes(device);
> + if (ret) {
> + btrfs_abort_transaction(trans, ret);
> + goto error_sysfs;
> + }
> +
> if (seeding_dev) {
> mutex_lock(&fs_info->chunk_mutex);
> ret = init_first_rw_device(trans);
> @@ -2729,6 +2871,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
> return ret;
>
> error_sysfs:
> + btrfs_destroy_dev_zonetypes(device);
> btrfs_sysfs_rm_device_link(fs_devices, device);
> mutex_lock(&fs_info->fs_devices->device_list_mutex);
> mutex_lock(&fs_info->chunk_mutex);
> diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
> index b8a0e8d0672d..1599641e216c 100644
> --- a/fs/btrfs/volumes.h
> +++ b/fs/btrfs/volumes.h
> @@ -62,6 +62,16 @@ struct btrfs_device {
>
> struct block_device *bdev;
>
> + /*
> + * Number of zones, zone size and types of zones if bdev is a
> + * zoned block device.
> + */
> + u64 zone_size;
> + u8 zone_size_shift;
> + u32 nr_zones;
> + unsigned long *seq_zones;
> + unsigned long *empty_zones;
> +

Also make a struct btrfs_zone_info and have a pointer to one here if we have
zone devices. Thanks,

Josef

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