[dm-devel] [PATCH 05/12] dm-zoned: add device pointer to struct dm_zone
Damien Le Moal
Damien.LeMoal at wdc.com
Mon May 25 02:15:43 UTC 2020
On 2020/05/23 0:39, Hannes Reinecke wrote:
> Add a pointer to the containing device to struct dm_zone and
> kill dmz_zone_to_dev().
>
> Signed-off-by: Hannes Reinecke <hare at suse.de>
> ---
> drivers/md/dm-zoned-metadata.c | 47 ++++++++++++------------------------------
> drivers/md/dm-zoned-reclaim.c | 18 +++++++---------
> drivers/md/dm-zoned-target.c | 7 +++----
> drivers/md/dm-zoned.h | 4 +++-
> 4 files changed, 26 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
> index fdae4e0228e7..7b6e7404f1e8 100644
> --- a/drivers/md/dm-zoned-metadata.c
> +++ b/drivers/md/dm-zoned-metadata.c
> @@ -229,16 +229,10 @@ struct dmz_metadata {
> */
> static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone)
> {
> - unsigned int zone_id;
> -
> if (WARN_ON(!zone))
> return 0;
>
> - zone_id = zone->id;
> - if (zmd->nr_devs > 1 &&
> - (zone_id >= zmd->dev[1].zone_offset))
> - zone_id -= zmd->dev[1].zone_offset;
> - return zone_id;
> + return zone->id - zone->dev->zone_offset;
> }
>
> sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
> @@ -255,18 +249,6 @@ sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
> return (sector_t)zone_id << zmd->zone_nr_blocks_shift;
> }
>
> -struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone)
> -{
> - if (WARN_ON(!zone))
> - return &zmd->dev[0];
> -
> - if (zmd->nr_devs > 1 &&
> - zone->id >= zmd->dev[1].zone_offset)
> - return &zmd->dev[1];
> -
> - return &zmd->dev[0];
> -}
> -
> unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd)
> {
> return zmd->zone_nr_blocks;
> @@ -1252,7 +1234,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
>
> /* Read and check the primary super block */
> zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
> - zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone);
> + zmd->sb[0].dev = zmd->sb[0].zone->dev;
> ret = dmz_get_sb(zmd, &zmd->sb[0], 0);
> if (ret) {
> dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
> @@ -1383,6 +1365,7 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
>
> INIT_LIST_HEAD(&zone->link);
> atomic_set(&zone->refcount, 0);
> + zone->dev = dev;
> zone->id = idx;
> zone->chunk = DMZ_MAP_UNMAPPED;
>
> @@ -1442,6 +1425,7 @@ static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
> return -EBUSY;
> INIT_LIST_HEAD(&zone->link);
> atomic_set(&zone->refcount, 0);
> + zone->dev = dev;
> zone->id = idx;
> zone->chunk = DMZ_MAP_UNMAPPED;
> set_bit(DMZ_CACHE, &zone->flags);
> @@ -1567,11 +1551,10 @@ static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx,
> */
> static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
> {
> - struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
If you keep this one and make it:
struct dmz_dev *dev = zone->dev;
You can avoid all the changes below, and dereferencing the same pointer multiple
times.
> unsigned int noio_flag;
> int ret;
>
> - if (dev->flags & DMZ_BDEV_REGULAR)
> + if (zone->dev->flags & DMZ_BDEV_REGULAR)
> return 0;
>
> /*
> @@ -1581,16 +1564,16 @@ static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
> * GFP_NOIO was specified.
> */
> noio_flag = memalloc_noio_save();
> - ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1,
> + ret = blkdev_report_zones(zone->dev->bdev, dmz_start_sect(zmd, zone), 1,
> dmz_update_zone_cb, zone);
> memalloc_noio_restore(noio_flag);
>
> if (ret == 0)
> ret = -EIO;
> if (ret < 0) {
> - dmz_dev_err(dev, "Get zone %u report failed",
> + dmz_dev_err(zone->dev, "Get zone %u report failed",
> zone->id);
> - dmz_check_bdev(dev);
> + dmz_check_bdev(zone->dev);
> return ret;
> }
>
> @@ -1604,7 +1587,6 @@ static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
> static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
> struct dm_zone *zone)
> {
> - struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
> unsigned int wp = 0;
> int ret;
>
> @@ -1613,7 +1595,8 @@ static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
> if (ret)
> return ret;
>
> - dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)",
> + dmz_dev_warn(zone->dev,
> + "Processing zone %u write error (zone wp %u/%u)",
> zone->id, zone->wp_block, wp);
>
> if (zone->wp_block < wp) {
> @@ -1641,13 +1624,11 @@ static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
> return 0;
>
> if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) {
> - struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
> -
> - ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET,
> + ret = blkdev_zone_mgmt(zone->dev->bdev, REQ_OP_ZONE_RESET,
> dmz_start_sect(zmd, zone),
> zmd->zone_nr_sectors, GFP_NOIO);
> if (ret) {
> - dmz_dev_err(dev, "Reset zone %u failed %d",
> + dmz_dev_err(zone->dev, "Reset zone %u failed %d",
> zone->id, ret);
> return ret;
> }
> @@ -2201,9 +2182,7 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
> goto again;
> }
> if (dmz_is_meta(zone)) {
> - struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
> -
> - dmz_dev_warn(dev, "Zone %u has metadata", zone->id);
> + dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id);
> zone = NULL;
> goto again;
> }
Same comment as above for all these changes.
> diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
> index 571bc1d41bab..d1a72b42dea2 100644
> --- a/drivers/md/dm-zoned-reclaim.c
> +++ b/drivers/md/dm-zoned-reclaim.c
> @@ -58,7 +58,6 @@ static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
> sector_t block)
> {
> struct dmz_metadata *zmd = zrc->metadata;
> - struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
> sector_t wp_block = zone->wp_block;
> unsigned int nr_blocks;
> int ret;
> @@ -74,15 +73,15 @@ static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
> * pointer and the requested position.
> */
> nr_blocks = block - wp_block;
> - ret = blkdev_issue_zeroout(dev->bdev,
> + ret = blkdev_issue_zeroout(zone->dev->bdev,
> dmz_start_sect(zmd, zone) + dmz_blk2sect(wp_block),
> dmz_blk2sect(nr_blocks), GFP_NOIO, 0);
> if (ret) {
> - dmz_dev_err(dev,
> + dmz_dev_err(zone->dev,
> "Align zone %u wp %llu to %llu (wp+%u) blocks failed %d",
> zone->id, (unsigned long long)wp_block,
> (unsigned long long)block, nr_blocks, ret);
> - dmz_check_bdev(dev);
> + dmz_check_bdev(zone->dev);
> return ret;
> }
Same again.
>
> @@ -116,7 +115,6 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
> struct dm_zone *src_zone, struct dm_zone *dst_zone)
> {
> struct dmz_metadata *zmd = zrc->metadata;
> - struct dmz_dev *src_dev, *dst_dev;
> struct dm_io_region src, dst;
> sector_t block = 0, end_block;
> sector_t nr_blocks;
> @@ -130,17 +128,15 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
> else
> end_block = dmz_zone_nr_blocks(zmd);
> src_zone_block = dmz_start_block(zmd, src_zone);
> - src_dev = dmz_zone_to_dev(zmd, src_zone);
> dst_zone_block = dmz_start_block(zmd, dst_zone);
> - dst_dev = dmz_zone_to_dev(zmd, dst_zone);
>
> if (dmz_is_seq(dst_zone))
> set_bit(DM_KCOPYD_WRITE_SEQ, &flags);
>
> while (block < end_block) {
> - if (src_dev->flags & DMZ_BDEV_DYING)
> + if (src_zone->dev->flags & DMZ_BDEV_DYING)
> return -EIO;
> - if (dst_dev->flags & DMZ_BDEV_DYING)
> + if (dst_zone->dev->flags & DMZ_BDEV_DYING)
> return -EIO;
>
> if (dmz_reclaim_should_terminate(src_zone))
> @@ -163,11 +159,11 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
> return ret;
> }
>
> - src.bdev = src_dev->bdev;
> + src.bdev = src_zone->dev->bdev;
> src.sector = dmz_blk2sect(src_zone_block + block);
> src.count = dmz_blk2sect(nr_blocks);
>
> - dst.bdev = dst_dev->bdev;
> + dst.bdev = dst_zone->dev->bdev;
> dst.sector = dmz_blk2sect(dst_zone_block + block);
> dst.count = src.count;
And again the same here.
>
> diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
> index 2770e293a97b..bca9a611b8dd 100644
> --- a/drivers/md/dm-zoned-target.c
> +++ b/drivers/md/dm-zoned-target.c
> @@ -123,18 +123,17 @@ static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,
> {
> struct dmz_bioctx *bioctx =
> dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
> - struct dmz_dev *dev = dmz_zone_to_dev(dmz->metadata, zone);
> struct bio *clone;
>
> - if (dev->flags & DMZ_BDEV_DYING)
> + if (zone->dev->flags & DMZ_BDEV_DYING)
> return -EIO;
>
> clone = bio_clone_fast(bio, GFP_NOIO, &dmz->bio_set);
> if (!clone)
> return -ENOMEM;
>
> - bio_set_dev(clone, dev->bdev);
> - bioctx->dev = dev;
> + bio_set_dev(clone, zone->dev->bdev);
> + bioctx->dev = zone->dev;
> clone->bi_iter.bi_sector =
> dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);
> clone->bi_iter.bi_size = dmz_blk2sect(nr_blocks) << SECTOR_SHIFT;
And here too. Yhe patch would become much shorter :)
> diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
> index 8083607b9535..356b436425e4 100644
> --- a/drivers/md/dm-zoned.h
> +++ b/drivers/md/dm-zoned.h
> @@ -80,6 +80,9 @@ struct dm_zone {
> /* For listing the zone depending on its state */
> struct list_head link;
>
> + /* Device containing this zone */
> + struct dmz_dev *dev;
> +
> /* Zone type and state */
> unsigned long flags;
>
> @@ -188,7 +191,6 @@ const char *dmz_metadata_label(struct dmz_metadata *zmd);
> sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone);
> sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone);
> unsigned int dmz_nr_chunks(struct dmz_metadata *zmd);
> -struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone);
>
> bool dmz_check_dev(struct dmz_metadata *zmd);
> bool dmz_dev_is_dying(struct dmz_metadata *zmd);
>
--
Damien Le Moal
Western Digital Research
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