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authorMartin K. Petersen2012-09-18 12:19:31 -0400
committerJames Bottomley2012-11-13 21:23:53 -0800
commit26e85fcd15f68b57d9ba645cd3591117a8ac0e05 (patch)
tree5dcb12ddd18e8ced5707239cdb0da6feaf3c9c80
parent3c6bdaeab4fda6c9fdd5f3f5c610dea97bddf7d6 (diff)
[SCSI] sd: Permit merged discard requests
Support requests with more than one bio payload for discards. The total number of bytes to be discarded is stored in req->__data_len and used in sd_done() to complete the I/O. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
-rw-r--r--drivers/scsi/sd.c32
1 files changed, 19 insertions, 13 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 12f6fdfc1147..c6af4c1a9ca3 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -583,29 +583,26 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
}
/**
- * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
+ * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
* @sdp: scsi device to operate one
* @rq: Request to prepare
*
* Will issue either UNMAP or WRITE SAME(16) depending on preference
* indicated by target device.
**/
-static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
+static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
{
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
- struct bio *bio = rq->bio;
- sector_t sector = bio->bi_sector;
- unsigned int nr_sectors = bio_sectors(bio);
+ sector_t sector = blk_rq_pos(rq);
+ unsigned int nr_sectors = blk_rq_sectors(rq);
+ unsigned int nr_bytes = blk_rq_bytes(rq);
unsigned int len;
int ret;
char *buf;
struct page *page;
- if (sdkp->device->sector_size == 4096) {
- sector >>= 3;
- nr_sectors >>= 3;
- }
-
+ sector >>= ilog2(sdp->sector_size) - 9;
+ nr_sectors >>= ilog2(sdp->sector_size) - 9;
rq->timeout = SD_TIMEOUT;
memset(rq->cmd, 0, rq->cmd_len);
@@ -660,6 +657,7 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
blk_add_request_payload(rq, page, len);
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
rq->buffer = page_address(page);
+ rq->__data_len = nr_bytes;
out:
if (ret != BLKPREP_OK) {
@@ -712,7 +710,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
* block PC requests to make life easier.
*/
if (rq->cmd_flags & REQ_DISCARD) {
- ret = scsi_setup_discard_cmnd(sdp, rq);
+ ret = sd_setup_discard_cmnd(sdp, rq);
goto out;
} else if (rq->cmd_flags & REQ_FLUSH) {
ret = scsi_setup_flush_cmnd(sdp, rq);
@@ -1482,12 +1480,20 @@ static int sd_done(struct scsi_cmnd *SCpnt)
unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
struct scsi_sense_hdr sshdr;
struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
+ struct request *req = SCpnt->request;
int sense_valid = 0;
int sense_deferred = 0;
unsigned char op = SCpnt->cmnd[0];
- if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
- scsi_set_resid(SCpnt, 0);
+ if (req->cmd_flags & REQ_DISCARD) {
+ if (!result) {
+ good_bytes = blk_rq_bytes(req);
+ scsi_set_resid(SCpnt, 0);
+ } else {
+ good_bytes = 0;
+ scsi_set_resid(SCpnt, blk_rq_bytes(req));
+ }
+ }
if (result) {
sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);