From: Dmitry Fomichev dmitry.fomichev@wdc.com
commit b39962950339912978484cdac50069258545d753 upstream.
dm-zoned is observed to log failed kernel assertions and not work correctly when operating against a device with a zone size smaller than 128MiB (e.g. 32768 bits per 4K block). The reason is that the bitmap size per zone is calculated as zero with such a small zone size. Fix this problem and also make the code related to zone bitmap management be able to handle per zone bitmaps smaller than a single block.
A dm-zoned-tools patch is required to properly format dm-zoned devices with zone sizes smaller than 128MiB.
Fixes: 3b1a94c88b79 ("dm zoned: drive-managed zoned block device target") Cc: stable@vger.kernel.org Signed-off-by: Dmitry Fomichev dmitry.fomichev@wdc.com Reviewed-by: Damien Le Moal damien.lemoal@wdc.com Signed-off-by: Mike Snitzer snitzer@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/md/dm-zoned-metadata.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-)
--- a/drivers/md/dm-zoned-metadata.c +++ b/drivers/md/dm-zoned-metadata.c @@ -132,6 +132,7 @@ struct dmz_metadata {
sector_t zone_bitmap_size; unsigned int zone_nr_bitmap_blocks; + unsigned int zone_bits_per_mblk;
unsigned int nr_bitmap_blocks; unsigned int nr_map_blocks; @@ -1165,7 +1166,10 @@ static int dmz_init_zones(struct dmz_met
/* Init */ zmd->zone_bitmap_size = dev->zone_nr_blocks >> 3; - zmd->zone_nr_bitmap_blocks = zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT; + zmd->zone_nr_bitmap_blocks = + max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT); + zmd->zone_bits_per_mblk = min_t(sector_t, dev->zone_nr_blocks, + DMZ_BLOCK_SIZE_BITS);
/* Allocate zone array */ zmd->zones = kcalloc(dev->nr_zones, sizeof(struct dm_zone), GFP_KERNEL); @@ -1982,7 +1986,7 @@ int dmz_copy_valid_blocks(struct dmz_met dmz_release_mblock(zmd, to_mblk); dmz_release_mblock(zmd, from_mblk);
- chunk_block += DMZ_BLOCK_SIZE_BITS; + chunk_block += zmd->zone_bits_per_mblk; }
to_zone->weight = from_zone->weight; @@ -2043,7 +2047,7 @@ int dmz_validate_blocks(struct dmz_metad
/* Set bits */ bit = chunk_block & DMZ_BLOCK_MASK_BITS; - nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); + nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); if (count) { @@ -2122,7 +2126,7 @@ int dmz_invalidate_blocks(struct dmz_met
/* Clear bits */ bit = chunk_block & DMZ_BLOCK_MASK_BITS; - nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); + nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
count = dmz_clear_bits((unsigned long *)mblk->data, bit, nr_bits); @@ -2182,6 +2186,7 @@ static int dmz_to_next_set_block(struct { struct dmz_mblock *mblk; unsigned int bit, set_bit, nr_bits; + unsigned int zone_bits = zmd->zone_bits_per_mblk; unsigned long *bitmap; int n = 0;
@@ -2196,15 +2201,15 @@ static int dmz_to_next_set_block(struct /* Get offset */ bitmap = (unsigned long *) mblk->data; bit = chunk_block & DMZ_BLOCK_MASK_BITS; - nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); + nr_bits = min(nr_blocks, zone_bits - bit); if (set) - set_bit = find_next_bit(bitmap, DMZ_BLOCK_SIZE_BITS, bit); + set_bit = find_next_bit(bitmap, zone_bits, bit); else - set_bit = find_next_zero_bit(bitmap, DMZ_BLOCK_SIZE_BITS, bit); + set_bit = find_next_zero_bit(bitmap, zone_bits, bit); dmz_release_mblock(zmd, mblk);
n += set_bit - bit; - if (set_bit < DMZ_BLOCK_SIZE_BITS) + if (set_bit < zone_bits) break;
nr_blocks -= nr_bits; @@ -2307,7 +2312,7 @@ static void dmz_get_zone_weight(struct d /* Count bits in this block */ bitmap = mblk->data; bit = chunk_block & DMZ_BLOCK_MASK_BITS; - nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); + nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); n += dmz_count_bits(bitmap, bit, nr_bits);
dmz_release_mblock(zmd, mblk);