[PATCH 04/16] block: allow blk-zoned devices to have non-power-of-2 zone size

Pankaj Raghav
2022-04-27T16:03:53Z

Convert the calculations on zone size to be generic instead of relying on
power_of_2 based logic in the block layer using the helpers wherever
possible.

The only hot path affected by this change for power_of_2 zoned devices
is in blk_check_zone_append() but the effects should be negligible as the
helper blk_queue_zone_aligned() optimizes the calculation for those
devices. Note that the append path cannot be accessed by direct raw access
to the block device but only through a filesystem abstraction.

Finally, remove the check for power_of_2 zone size requirement in
blk-zoned.c

Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
block/blk-core.c | 3 +--
block/blk-zoned.c | 12 ++++++------
2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 937bb6b86331..850caf311064 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -634,8 +634,7 @@ static inline blk_status_t blk_check_zone_append(struct request_queue *q,
return BLK_STS_NOTSUPP;

/* The bio sector must point to the start of a sequential zone */
- if (pos & (blk_queue_zone_sectors(q) - 1) ||
- !blk_queue_zone_is_seq(q, pos))
+ if (!blk_queue_zone_aligned(q, pos) || !blk_queue_zone_is_seq(q, pos))
return BLK_STS_IOERR;

/*
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 1dff4a8bd51d..f7c7c3bd148d 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -288,10 +288,10 @@ int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
return -EINVAL;

/* Check alignment (handle eventual smaller last zone) */
- if (sector & (zone_sectors - 1))
+ if (!blk_queue_zone_aligned(q, sector))
return -EINVAL;

- if ((nr_sectors & (zone_sectors - 1)) && end_sector != capacity)
+ if (!blk_queue_zone_aligned(q, nr_sectors) && end_sector != capacity)
return -EINVAL;

/*
@@ -489,14 +489,14 @@ static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx,
* smaller last zone.
*/
if (zone->start == 0) {
- if (zone->len == 0 || !is_power_of_2(zone->len)) {
- pr_warn("%s: Invalid zoned device with non power of two zone size (%llu)\n",
- disk->disk_name, zone->len);
+ if (zone->len == 0) {
+ pr_warn("%s: Invalid zoned device size",
+ disk->disk_name);
return -ENODEV;
}

args->zone_sectors = zone->len;
- args->nr_zones = (capacity + zone->len - 1) >> ilog2(zone->len);
+ args->nr_zones = div64_u64(capacity + zone->len - 1, zone->len);
} else if (zone->start + args->zone_sectors < capacity) {
if (zone->len != args->zone_sectors) {
pr_warn("%s: Invalid zoned device with non constant zone size\n",
--
2.25.1