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sg: convert the non-data path to use the block layer 

This patch converts the non data path to use the block layer functions
(blk_get_request, blk_execute_rq_nowait, etc) instead of uses
scsi_execute_async().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Douglas Gilbert <dougg@torque.net>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
FUJITA Tomonori 2008-08-28 16:17:07 +09:00 committed by Jens Axboe
parent 152e283fdf
commit 10865dfa34
1 changed files with 48 additions and 5 deletions
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53
drivers/scsi/sg.c
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@ -137,6 +137,7 @@ typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
char orphan; /* 1 -> drop on sight, 0 -> normal */
char sg_io_owned; /* 1 -> packet belongs to SG_IO */
volatile char done; /* 0->before bh, 1->before read, 2->read */
struct request *rq;
} Sg_request;
typedef struct sg_fd { /* holds the state of a file descriptor */
@ -176,7 +177,7 @@ typedef struct sg_device { /* holds the state of each scsi generic device */
static int sg_fasync(int fd, struct file *filp, int mode);
/* tasklet or soft irq callback */
static void sg_cmd_done(void *data, char *sense, int result, int resid);
static int sg_start_req(Sg_request * srp);
static int sg_start_req(Sg_request *srp, unsigned char *cmd);
static void sg_finish_rem_req(Sg_request * srp);
static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
@ -229,6 +230,11 @@ static int sg_allow_access(struct file *filp, unsigned char *cmd)
cmd, filp->f_mode & FMODE_WRITE);
}
static void sg_rq_end_io(struct request *rq, int uptodate)
{
sg_cmd_done(rq->end_io_data, rq->sense, rq->errors, rq->data_len);
}
static int
sg_open(struct inode *inode, struct file *filp)
{
@ -732,7 +738,8 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
(int) cmnd[0], (int) hp->cmd_len));
if ((k = sg_start_req(srp))) {
k = sg_start_req(srp, cmnd);
if (k) {
SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
sg_finish_rem_req(srp);
return k; /* probably out of space --> ENOMEM */
@ -765,6 +772,12 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
hp->duration = jiffies_to_msecs(jiffies);
/* Now send everything of to mid-level. The next time we hear about this
packet is when sg_cmd_done() is called (i.e. a callback). */
if (srp->rq) {
srp->rq->timeout = timeout;
blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
srp->rq, 1, sg_rq_end_io);
return 0;
}
if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
hp->dxfer_len, srp->data.k_use_sg, timeout,
SG_DEFAULT_RETRIES, srp, sg_cmd_done,
@ -1634,8 +1647,32 @@ exit_sg(void)
idr_destroy(&sg_index_idr);
}
static int
sg_start_req(Sg_request * srp)
static int __sg_start_req(struct sg_request *srp, struct sg_io_hdr *hp,
unsigned char *cmd)
{
struct sg_fd *sfp = srp->parentfp;
struct request_queue *q = sfp->parentdp->device->request_queue;
struct request *rq;
int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
rq = blk_get_request(q, rw, GFP_ATOMIC);
if (!rq)
return -ENOMEM;
memcpy(rq->cmd, cmd, hp->cmd_len);
rq->cmd_len = hp->cmd_len;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
srp->rq = rq;
rq->end_io_data = srp;
rq->sense = srp->sense_b;
rq->retries = SG_DEFAULT_RETRIES;
return 0;
}
static int sg_start_req(Sg_request *srp, unsigned char *cmd)
{
int res;
Sg_fd *sfp = srp->parentfp;
@ -1646,8 +1683,10 @@ sg_start_req(Sg_request * srp)
Sg_scatter_hold *rsv_schp = &sfp->reserve;
SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
return 0;
return __sg_start_req(srp, hp, cmd);
if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
(dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
(!sfp->parentdp->device->host->unchecked_isa_dma)) {
@ -1678,6 +1717,10 @@ sg_finish_rem_req(Sg_request * srp)
sg_unlink_reserve(sfp, srp);
else
sg_remove_scat(req_schp);
if (srp->rq)
blk_put_request(srp->rq);
sg_remove_request(sfp, srp);
}