From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Create a helper function for each of the 6, 10, 16 and 32-byte
READ/WRITE variants and use those when setting up reads and writes.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
[ bvanassche: ported this patch from kernel v4.11 to kernel v5.0 and made
function names shorter. ]
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
drivers/scsi/sd.c | 167 +++++++++++++++++++++++++---------------------
1 file changed, 92 insertions(+), 75 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 0b609a3a207a..039b0c7f178e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1073,6 +1073,83 @@ static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
return BLK_STS_OK;
}
+static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
+ sector_t lba, unsigned int nr_blocks,
+ unsigned char flags)
+{
+ cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
+ if (unlikely(cmd->cmnd == NULL))
+ return BLK_STS_RESOURCE;
+
+ cmd->cmd_len = SD_EXT_CDB_SIZE;
+ memset(cmd->cmnd, 0, cmd->cmd_len);
+
+ cmd->cmnd[0] = VARIABLE_LENGTH_CMD;
+ cmd->cmnd[7] = 0x18; /* Additional CDB len */
+ cmd->cmnd[9] = write ? WRITE_32 : READ_32;
+ cmd->cmnd[10] = flags;
+ put_unaligned_be64(lba, &cmd->cmnd[12]);
+ put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
+ put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
+
+ return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
+ sector_t lba, unsigned int nr_blocks,
+ unsigned char flags)
+{
+ cmd->cmd_len = 16;
+ cmd->cmnd[0] = write ? WRITE_16 : READ_16;
+ cmd->cmnd[1] = flags;
+ cmd->cmnd[14] = 0;
+ cmd->cmnd[15] = 0;
+ put_unaligned_be64(lba, &cmd->cmnd[2]);
+ put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
+
+ return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
+ sector_t lba, unsigned int nr_blocks,
+ unsigned char flags)
+{
+ cmd->cmd_len = 10;
+ cmd->cmnd[0] = write ? WRITE_10 : READ_10;
+ cmd->cmnd[1] = flags;
+ cmd->cmnd[6] = 0;
+ cmd->cmnd[9] = 0;
+ put_unaligned_be32(lba, &cmd->cmnd[2]);
+ put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
+
+ return BLK_STS_OK;
+}
+
+static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
+ sector_t lba, unsigned int nr_blocks,
+ unsigned char flags)
+{
+ if (unlikely(flags & 0x8)) {
+ /*
+ * This happens only if this drive failed 10byte rw
+ * command with ILLEGAL_REQUEST during operation and
+ * thus turned off use_10_for_rw.
+ */
+ scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
+ return BLK_STS_IOERR;
+ }
+
+ cmd->cmd_len = 6;
+ cmd->cmnd[0] = write ? WRITE_6 : READ_6;
+ cmd->cmnd[1] = (lba >> 16) & 0x1f;
+ cmd->cmnd[2] = (lba >> 8) & 0xff;
+ cmd->cmnd[3] = lba & 0xff;
+ cmd->cmnd[4] = nr_blocks;
+ cmd->cmnd[5] = 0;
+
+ return BLK_STS_OK;
+}
+
static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
{
struct request *rq = SCpnt->request;
@@ -1084,7 +1161,8 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
unsigned int dif, dix;
unsigned int mask = logical_to_sectors(sdp, 1) - 1;
- unsigned char protect;
+ bool write = rq_data_dir(rq) == WRITE;
+ unsigned char protect, fua;
blk_status_t ret;
ret = scsi_init_io(SCpnt);
@@ -1159,6 +1237,7 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
"writing" : "reading", nr_blocks,
blk_rq_sectors(rq)));
+ fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
dix = scsi_prot_sg_count(SCpnt);
dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
@@ -1168,86 +1247,24 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
protect = 0;
if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
- SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
-
- if (unlikely(!SCpnt->cmnd))
- return BLK_STS_RESOURCE;
-
- SCpnt->cmd_len = SD_EXT_CDB_SIZE;
- memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
- SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
- SCpnt->cmnd[7] = 0x18;
- SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
- SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
-
- /* LBA */
- SCpnt->cmnd[12] = sizeof(lba) > 4 ? (unsigned char) (lba >> 56) & 0xff : 0;
- SCpnt->cmnd[13] = sizeof(lba) > 4 ? (unsigned char) (lba >> 48) & 0xff : 0;
- SCpnt->cmnd[14] = sizeof(lba) > 4 ? (unsigned char) (lba >> 40) & 0xff : 0;
- SCpnt->cmnd[15] = sizeof(lba) > 4 ? (unsigned char) (lba >> 32) & 0xff : 0;
- SCpnt->cmnd[16] = (unsigned char) (lba >> 24) & 0xff;
- SCpnt->cmnd[17] = (unsigned char) (lba >> 16) & 0xff;
- SCpnt->cmnd[18] = (unsigned char) (lba >> 8) & 0xff;
- SCpnt->cmnd[19] = (unsigned char) lba & 0xff;
-
- /* Expected Indirect LBA */
- SCpnt->cmnd[20] = (unsigned char) (lba >> 24) & 0xff;
- SCpnt->cmnd[21] = (unsigned char) (lba >> 16) & 0xff;
- SCpnt->cmnd[22] = (unsigned char) (lba >> 8) & 0xff;
- SCpnt->cmnd[23] = (unsigned char) lba & 0xff;
-
- /* Transfer length */
- SCpnt->cmnd[28] = (unsigned char) (nr_blocks >> 24) & 0xff;
- SCpnt->cmnd[29] = (unsigned char) (nr_blocks >> 16) & 0xff;
- SCpnt->cmnd[30] = (unsigned char) (nr_blocks >> 8) & 0xff;
- SCpnt->cmnd[31] = (unsigned char) nr_blocks & 0xff;
+ ret = sd_setup_rw32_cmnd(SCpnt, write, lba, nr_blocks,
+ protect | fua);
} else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
- SCpnt->cmnd[0] += READ_16 - READ_6;
- SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
- SCpnt->cmnd[2] = sizeof(lba) > 4 ? (unsigned char) (lba >> 56) & 0xff : 0;
- SCpnt->cmnd[3] = sizeof(lba) > 4 ? (unsigned char) (lba >> 48) & 0xff : 0;
- SCpnt->cmnd[4] = sizeof(lba) > 4 ? (unsigned char) (lba >> 40) & 0xff : 0;
- SCpnt->cmnd[5] = sizeof(lba) > 4 ? (unsigned char) (lba >> 32) & 0xff : 0;
- SCpnt->cmnd[6] = (unsigned char) (lba >> 24) & 0xff;
- SCpnt->cmnd[7] = (unsigned char) (lba >> 16) & 0xff;
- SCpnt->cmnd[8] = (unsigned char) (lba >> 8) & 0xff;
- SCpnt->cmnd[9] = (unsigned char) lba & 0xff;
- SCpnt->cmnd[10] = (unsigned char) (nr_blocks >> 24) & 0xff;
- SCpnt->cmnd[11] = (unsigned char) (nr_blocks >> 16) & 0xff;
- SCpnt->cmnd[12] = (unsigned char) (nr_blocks >> 8) & 0xff;
- SCpnt->cmnd[13] = (unsigned char) nr_blocks & 0xff;
- SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
+ ret = sd_setup_rw16_cmnd(SCpnt, write, lba, nr_blocks,
+ protect | fua);
} else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
scsi_device_protection(SCpnt->device) ||
SCpnt->device->use_10_for_rw) {
- SCpnt->cmnd[0] += READ_10 - READ_6;
- SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
- SCpnt->cmnd[2] = (unsigned char) (lba >> 24) & 0xff;
- SCpnt->cmnd[3] = (unsigned char) (lba >> 16) & 0xff;
- SCpnt->cmnd[4] = (unsigned char) (lba >> 8) & 0xff;
- SCpnt->cmnd[5] = (unsigned char) lba & 0xff;
- SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
- SCpnt->cmnd[7] = (unsigned char) (nr_blocks >> 8) & 0xff;
- SCpnt->cmnd[8] = (unsigned char) nr_blocks & 0xff;
+ ret = sd_setup_rw10_cmnd(SCpnt, write, lba, nr_blocks,
+ protect | fua);
} else {
- if (unlikely(rq->cmd_flags & REQ_FUA)) {
- /*
- * This happens only if this drive failed
- * 10byte rw command with ILLEGAL_REQUEST
- * during operation and thus turned off
- * use_10_for_rw.
- */
- scmd_printk(KERN_ERR, SCpnt,
- "FUA write on READ/WRITE(6) drive\n");
- return BLK_STS_IOERR;
- }
-
- SCpnt->cmnd[1] |= (unsigned char) ((lba >> 16) & 0x1f);
- SCpnt->cmnd[2] = (unsigned char) ((lba >> 8) & 0xff);
- SCpnt->cmnd[3] = (unsigned char) lba & 0xff;
- SCpnt->cmnd[4] = (unsigned char) nr_blocks;
- SCpnt->cmnd[5] = 0;
+ ret = sd_setup_rw6_cmnd(SCpnt, write, lba, nr_blocks,
+ protect | fua);
}
+
+ if (unlikely(ret != BLK_STS_OK))
+ return ret;
+
SCpnt->sdb.length = nr_blocks * sdp->sector_size;
/*
--
2.20.1.97.g81188d93c3-goog
