@@ -832,6 +832,8 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
q->limits.discard_granularity =
max(sdkp->physical_block_size,
sdkp->unmap_granularity * logical_block_size);
+ blk_queue_max_discard_segments(q, min_t(u32, U16_MAX,
+ sdkp->max_unmap_block_desc_count));
sdkp->provisioning_mode = mode;
switch (mode) {
@@ -891,9 +893,12 @@ static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
struct scsi_device *sdp = cmd->device;
struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
- u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
- u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
- unsigned int data_len = 24;
+ struct bio *bio;
+ unsigned short segments = blk_rq_nr_discard_segments(rq);
+ unsigned int data_len = 8 + 16 * segments;
+ unsigned int descriptor_offset = 8;
+ u64 lba;
+ u32 nr_blocks;
char *buf;
buf = sd_set_special_bvec(rq, data_len);
@@ -902,12 +907,28 @@ static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
cmd->cmd_len = 10;
cmd->cmnd[0] = UNMAP;
- cmd->cmnd[8] = 24;
+ cmd->cmnd[7] = data_len >> 8;
+ cmd->cmnd[8] = data_len & 0xff;
+
+ put_unaligned_be16(6 + 16 * segments, &buf[0]);
+ put_unaligned_be16(16 * segments, &buf[2]);
- put_unaligned_be16(6 + 16, &buf[0]);
- put_unaligned_be16(16, &buf[2]);
- put_unaligned_be64(lba, &buf[8]);
- put_unaligned_be32(nr_blocks, &buf[16]);
+ if (segments > 1) {
+ __rq_for_each_bio(bio, rq) {
+ lba = sectors_to_logical(sdp, bio->bi_iter.bi_sector);
+ nr_blocks = sectors_to_logical(sdp, bio_sectors(bio));
+
+ put_unaligned_be64(lba, &buf[descriptor_offset]);
+ put_unaligned_be32(nr_blocks, &buf[descriptor_offset + 8]);
+ descriptor_offset += 16;
+ }
+ } else {
+ lba = sectors_to_logical(sdp, blk_rq_pos(rq));
+ nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
+
+ put_unaligned_be64(lba, &buf[descriptor_offset]);
+ put_unaligned_be32(nr_blocks, &buf[descriptor_offset + 8]);
+ }
cmd->allowed = sdkp->max_retries;
cmd->transfersize = data_len;
@@ -3066,7 +3087,7 @@ static void sd_read_block_limits(struct scsi_disk *sdkp)
sdkp->opt_xfer_blocks = get_unaligned_be32(&vpd->data[12]);
if (vpd->len >= 64) {
- unsigned int lba_count, desc_count;
+ unsigned int lba_count;
sdkp->max_ws_blocks = (u32)get_unaligned_be64(&vpd->data[36]);
@@ -3074,9 +3095,12 @@ static void sd_read_block_limits(struct scsi_disk *sdkp)
goto out;
lba_count = get_unaligned_be32(&vpd->data[20]);
- desc_count = get_unaligned_be32(&vpd->data[24]);
- if (lba_count && desc_count)
+ /* Extract the MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT. */
+ sdkp->max_unmap_block_desc_count =
+ get_unaligned_be32(&vpd->data[24]);
+
+ if (lba_count && sdkp->max_unmap_block_desc_count)
sdkp->max_unmap_blocks = lba_count;
sdkp->unmap_granularity = get_unaligned_be32(&vpd->data[28]);
@@ -119,6 +119,7 @@ struct scsi_disk {
u32 opt_xfer_blocks;
u32 max_ws_blocks;
u32 max_unmap_blocks;
+ u32 max_unmap_block_desc_count;
u32 unmap_granularity;
u32 unmap_alignment;
u32 index;
As SCSI SBC4 specification section 5.30.2 describes that it can support unmapping one or more LBA range in single UNMAP command. However, previously we only pack one LBA range in UNMAP command by default no matter device gives the block limits that says it can support unmapping multiple LBA ranges with a single UNMAP command. This patch sets max_discard_segments config according to block limits of device, and supports unmapping multiple LBA ranges with a single UNMAP command. Signed-off-by: Chao Yu <chao@kernel.org> --- v6: - in this version, we fix a compatibility issue: for a scsi device which doesn't support handling multiple ranges in single UNMAP command, it should to load start LBA and length of target range from rq.__sector and rq.__data_len, instead of bi_sector and bi_size in first bio in bio chain, otherwise if there is multiple bios were chained in request, we may miss to add ranges of following bios in the chain into UNMAP command. drivers/scsi/sd.c | 46 +++++++++++++++++++++++++++++++++++----------- drivers/scsi/sd.h | 1 + 2 files changed, 36 insertions(+), 11 deletions(-)