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authorChristoph Hellwig <hch@lst.de>2017-01-27 09:46:29 +0100
committerJens Axboe <axboe@fb.com>2017-01-27 15:08:35 -0700
commit82ed4db499b8598f16f8871261bff088d6b0597f (patch)
treee1cc0a433bf5ae2b9723837291617bdfeeb61816 /drivers/scsi/sg.c
parent8ae94eb65be9425af4d57a4f4cfebfdf03081e93 (diff)
block: split scsi_request out of struct request
And require all drivers that want to support BLOCK_PC to allocate it as the first thing of their private data. To support this the legacy IDE and BSG code is switched to set cmd_size on their queues to let the block layer allocate the additional space. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/scsi/sg.c')
-rw-r--r--drivers/scsi/sg.c30
1 files changed, 16 insertions, 14 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index dbe5b4b95df0..226a8def7a8b 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -781,9 +781,7 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
}
if (atomic_read(&sdp->detaching)) {
if (srp->bio) {
- if (srp->rq->cmd != srp->rq->__cmd)
- kfree(srp->rq->cmd);
-
+ scsi_req_free_cmd(scsi_req(srp->rq));
blk_end_request_all(srp->rq, -EIO);
srp->rq = NULL;
}
@@ -1279,6 +1277,7 @@ static void
sg_rq_end_io(struct request *rq, int uptodate)
{
struct sg_request *srp = rq->end_io_data;
+ struct scsi_request *req = scsi_req(rq);
Sg_device *sdp;
Sg_fd *sfp;
unsigned long iflags;
@@ -1297,9 +1296,9 @@ sg_rq_end_io(struct request *rq, int uptodate)
if (unlikely(atomic_read(&sdp->detaching)))
pr_info("%s: device detaching\n", __func__);
- sense = rq->sense;
+ sense = req->sense;
result = rq->errors;
- resid = rq->resid_len;
+ resid = req->resid_len;
SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
"sg_cmd_done: pack_id=%d, res=0x%x\n",
@@ -1333,6 +1332,10 @@ sg_rq_end_io(struct request *rq, int uptodate)
sdp->device->changed = 1;
}
}
+
+ if (req->sense_len)
+ memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE);
+
/* Rely on write phase to clean out srp status values, so no "else" */
/*
@@ -1342,8 +1345,7 @@ sg_rq_end_io(struct request *rq, int uptodate)
* blk_rq_unmap_user() can be called from user context.
*/
srp->rq = NULL;
- if (rq->cmd != rq->__cmd)
- kfree(rq->cmd);
+ scsi_req_free_cmd(scsi_req(rq));
__blk_put_request(rq->q, rq);
write_lock_irqsave(&sfp->rq_list_lock, iflags);
@@ -1658,6 +1660,7 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
{
int res;
struct request *rq;
+ struct scsi_request *req;
Sg_fd *sfp = srp->parentfp;
sg_io_hdr_t *hp = &srp->header;
int dxfer_len = (int) hp->dxfer_len;
@@ -1700,17 +1703,17 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
kfree(long_cmdp);
return PTR_ERR(rq);
}
+ req = scsi_req(rq);
- blk_rq_set_block_pc(rq);
+ scsi_req_init(rq);
if (hp->cmd_len > BLK_MAX_CDB)
- rq->cmd = long_cmdp;
- memcpy(rq->cmd, cmd, hp->cmd_len);
- rq->cmd_len = hp->cmd_len;
+ req->cmd = long_cmdp;
+ memcpy(req->cmd, cmd, hp->cmd_len);
+ req->cmd_len = hp->cmd_len;
srp->rq = rq;
rq->end_io_data = srp;
- rq->sense = srp->sense_b;
rq->retries = SG_DEFAULT_RETRIES;
if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
@@ -1786,8 +1789,7 @@ sg_finish_rem_req(Sg_request *srp)
ret = blk_rq_unmap_user(srp->bio);
if (srp->rq) {
- if (srp->rq->cmd != srp->rq->__cmd)
- kfree(srp->rq->cmd);
+ scsi_req_free_cmd(scsi_req(srp->rq));
blk_put_request(srp->rq);
}

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