mirror of https://gitee.com/openkylin/linux.git
[SCSI] remove scsi_req_map_sg
No one uses scsi_execute_async with data transfer now. We can remove scsi_req_map_sg. Only scsi_eh_lock_door uses scsi_execute_async. scsi_eh_lock_door doesn't handle sense and the callback. So we can remove scsi_io_context too. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
FUJITA Tomonori
James Bottomley
parent
26243043f2
commit
f078727b25
|
|
@ -1441,6 +1441,11 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
|
|||
}
|
||||
}
|
||||
|
||||
static void eh_lock_door_done(struct request *req, int uptodate)
|
||||
{
|
||||
__blk_put_request(req->q, req);
|
||||
}
|
||||
|
||||
/**
|
||||
* scsi_eh_lock_door - Prevent medium removal for the specified device
|
||||
* @sdev: SCSI device to prevent medium removal
|
||||
|
|
@ -1463,20 +1468,29 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
|
|||
*/
|
||||
static void scsi_eh_lock_door(struct scsi_device *sdev)
|
||||
{
|
||||
unsigned char cmnd[MAX_COMMAND_SIZE];
|
||||
struct request *req;
|
||||
|
||||
cmnd[0] = ALLOW_MEDIUM_REMOVAL;
|
||||
cmnd[1] = 0;
|
||||
cmnd[2] = 0;
|
||||
cmnd[3] = 0;
|
||||
cmnd[4] = SCSI_REMOVAL_PREVENT;
|
||||
cmnd[5] = 0;
|
||||
req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL);
|
||||
if (!req)
|
||||
return;
|
||||
|
||||
scsi_execute_async(sdev, cmnd, 6, DMA_NONE, NULL, 0, 0, 10 * HZ,
|
||||
5, NULL, NULL, GFP_KERNEL);
|
||||
req->cmd[0] = ALLOW_MEDIUM_REMOVAL;
|
||||
req->cmd[1] = 0;
|
||||
req->cmd[2] = 0;
|
||||
req->cmd[3] = 0;
|
||||
req->cmd[4] = SCSI_REMOVAL_PREVENT;
|
||||
req->cmd[5] = 0;
|
||||
|
||||
req->cmd_len = COMMAND_SIZE(req->cmd[0]);
|
||||
|
||||
req->cmd_type = REQ_TYPE_BLOCK_PC;
|
||||
req->cmd_flags |= REQ_QUIET;
|
||||
req->timeout = 10 * HZ;
|
||||
req->retries = 5;
|
||||
|
||||
blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* scsi_restart_operations - restart io operations to the specified host.
|
||||
* @shost: Host we are restarting.
|
||||
|
|
|
|||
|
|
@ -277,196 +277,6 @@ int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
|
|||
}
|
||||
EXPORT_SYMBOL(scsi_execute_req);
|
||||
|
||||
struct scsi_io_context {
|
||||
void *data;
|
||||
void (*done)(void *data, char *sense, int result, int resid);
|
||||
char sense[SCSI_SENSE_BUFFERSIZE];
|
||||
};
|
||||
|
||||
static struct kmem_cache *scsi_io_context_cache;
|
||||
|
||||
static void scsi_end_async(struct request *req, int uptodate)
|
||||
{
|
||||
struct scsi_io_context *sioc = req->end_io_data;
|
||||
|
||||
if (sioc->done)
|
||||
sioc->done(sioc->data, sioc->sense, req->errors, req->data_len);
|
||||
|
||||
kmem_cache_free(scsi_io_context_cache, sioc);
|
||||
__blk_put_request(req->q, req);
|
||||
}
|
||||
|
||||
static int scsi_merge_bio(struct request *rq, struct bio *bio)
|
||||
{
|
||||
struct request_queue *q = rq->q;
|
||||
|
||||
bio->bi_flags &= ~(1 << BIO_SEG_VALID);
|
||||
if (rq_data_dir(rq) == WRITE)
|
||||
bio->bi_rw |= (1 << BIO_RW);
|
||||
blk_queue_bounce(q, &bio);
|
||||
|
||||
return blk_rq_append_bio(q, rq, bio);
|
||||
}
|
||||
|
||||
static void scsi_bi_endio(struct bio *bio, int error)
|
||||
{
|
||||
bio_put(bio);
|
||||
}
|
||||
|
||||
/**
|
||||
* scsi_req_map_sg - map a scatterlist into a request
|
||||
* @rq: request to fill
|
||||
* @sgl: scatterlist
|
||||
* @nsegs: number of elements
|
||||
* @bufflen: len of buffer
|
||||
* @gfp: memory allocation flags
|
||||
*
|
||||
* scsi_req_map_sg maps a scatterlist into a request so that the
|
||||
* request can be sent to the block layer. We do not trust the scatterlist
|
||||
* sent to use, as some ULDs use that struct to only organize the pages.
|
||||
*/
|
||||
static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
|
||||
int nsegs, unsigned bufflen, gfp_t gfp)
|
||||
{
|
||||
struct request_queue *q = rq->q;
|
||||
int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
||||
unsigned int data_len = bufflen, len, bytes, off;
|
||||
struct scatterlist *sg;
|
||||
struct page *page;
|
||||
struct bio *bio = NULL;
|
||||
int i, err, nr_vecs = 0;
|
||||
|
||||
for_each_sg(sgl, sg, nsegs, i) {
|
||||
page = sg_page(sg);
|
||||
off = sg->offset;
|
||||
len = sg->length;
|
||||
|
||||
while (len > 0 && data_len > 0) {
|
||||
/*
|
||||
* sg sends a scatterlist that is larger than
|
||||
* the data_len it wants transferred for certain
|
||||
* IO sizes
|
||||
*/
|
||||
bytes = min_t(unsigned int, len, PAGE_SIZE - off);
|
||||
bytes = min(bytes, data_len);
|
||||
|
||||
if (!bio) {
|
||||
nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
|
||||
nr_pages -= nr_vecs;
|
||||
|
||||
bio = bio_alloc(gfp, nr_vecs);
|
||||
if (!bio) {
|
||||
err = -ENOMEM;
|
||||
goto free_bios;
|
||||
}
|
||||
bio->bi_end_io = scsi_bi_endio;
|
||||
}
|
||||
|
||||
if (bio_add_pc_page(q, bio, page, bytes, off) !=
|
||||
bytes) {
|
||||
bio_put(bio);
|
||||
err = -EINVAL;
|
||||
goto free_bios;
|
||||
}
|
||||
|
||||
if (bio->bi_vcnt >= nr_vecs) {
|
||||
err = scsi_merge_bio(rq, bio);
|
||||
if (err) {
|
||||
bio_endio(bio, 0);
|
||||
goto free_bios;
|
||||
}
|
||||
bio = NULL;
|
||||
}
|
||||
|
||||
page++;
|
||||
len -= bytes;
|
||||
data_len -=bytes;
|
||||
off = 0;
|
||||
}
|
||||
}
|
||||
|
||||
rq->buffer = rq->data = NULL;
|
||||
rq->data_len = bufflen;
|
||||
return 0;
|
||||
|
||||
free_bios:
|
||||
while ((bio = rq->bio) != NULL) {
|
||||
rq->bio = bio->bi_next;
|
||||
/*
|
||||
* call endio instead of bio_put incase it was bounced
|
||||
*/
|
||||
bio_endio(bio, 0);
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* scsi_execute_async - insert request
|
||||
* @sdev: scsi device
|
||||
* @cmd: scsi command
|
||||
* @cmd_len: length of scsi cdb
|
||||
* @data_direction: DMA_TO_DEVICE, DMA_FROM_DEVICE, or DMA_NONE
|
||||
* @buffer: data buffer (this can be a kernel buffer or scatterlist)
|
||||
* @bufflen: len of buffer
|
||||
* @use_sg: if buffer is a scatterlist this is the number of elements
|
||||
* @timeout: request timeout in seconds
|
||||
* @retries: number of times to retry request
|
||||
* @privdata: data passed to done()
|
||||
* @done: callback function when done
|
||||
* @gfp: memory allocation flags
|
||||
*/
|
||||
int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
|
||||
int cmd_len, int data_direction, void *buffer, unsigned bufflen,
|
||||
int use_sg, int timeout, int retries, void *privdata,
|
||||
void (*done)(void *, char *, int, int), gfp_t gfp)
|
||||
{
|
||||
struct request *req;
|
||||
struct scsi_io_context *sioc;
|
||||
int err = 0;
|
||||
int write = (data_direction == DMA_TO_DEVICE);
|
||||
|
||||
sioc = kmem_cache_zalloc(scsi_io_context_cache, gfp);
|
||||
if (!sioc)
|
||||
return DRIVER_ERROR << 24;
|
||||
|
||||
req = blk_get_request(sdev->request_queue, write, gfp);
|
||||
if (!req)
|
||||
goto free_sense;
|
||||
req->cmd_type = REQ_TYPE_BLOCK_PC;
|
||||
req->cmd_flags |= REQ_QUIET;
|
||||
|
||||
if (use_sg)
|
||||
err = scsi_req_map_sg(req, buffer, use_sg, bufflen, gfp);
|
||||
else if (bufflen)
|
||||
err = blk_rq_map_kern(req->q, req, buffer, bufflen, gfp);
|
||||
|
||||
if (err)
|
||||
goto free_req;
|
||||
|
||||
req->cmd_len = cmd_len;
|
||||
memset(req->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
|
||||
memcpy(req->cmd, cmd, req->cmd_len);
|
||||
req->sense = sioc->sense;
|
||||
req->sense_len = 0;
|
||||
req->timeout = timeout;
|
||||
req->retries = retries;
|
||||
req->end_io_data = sioc;
|
||||
|
||||
sioc->data = privdata;
|
||||
sioc->done = done;
|
||||
|
||||
blk_execute_rq_nowait(req->q, NULL, req, 1, scsi_end_async);
|
||||
return 0;
|
||||
|
||||
free_req:
|
||||
blk_put_request(req);
|
||||
free_sense:
|
||||
kmem_cache_free(scsi_io_context_cache, sioc);
|
||||
return DRIVER_ERROR << 24;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(scsi_execute_async);
|
||||
|
||||
/*
|
||||
* Function: scsi_init_cmd_errh()
|
||||
*
|
||||
|
|
@ -1920,20 +1730,12 @@ int __init scsi_init_queue(void)
|
|||
{
|
||||
int i;
|
||||
|
||||
scsi_io_context_cache = kmem_cache_create("scsi_io_context",
|
||||
sizeof(struct scsi_io_context),
|
||||
0, 0, NULL);
|
||||
if (!scsi_io_context_cache) {
|
||||
printk(KERN_ERR "SCSI: can't init scsi io context cache\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
scsi_sdb_cache = kmem_cache_create("scsi_data_buffer",
|
||||
sizeof(struct scsi_data_buffer),
|
||||
0, 0, NULL);
|
||||
if (!scsi_sdb_cache) {
|
||||
printk(KERN_ERR "SCSI: can't init scsi sdb cache\n");
|
||||
goto cleanup_io_context;
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
for (i = 0; i < SG_MEMPOOL_NR; i++) {
|
||||
|
|
@ -1968,8 +1770,6 @@ int __init scsi_init_queue(void)
|
|||
kmem_cache_destroy(sgp->slab);
|
||||
}
|
||||
kmem_cache_destroy(scsi_sdb_cache);
|
||||
cleanup_io_context:
|
||||
kmem_cache_destroy(scsi_io_context_cache);
|
||||
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
|
@ -1978,7 +1778,6 @@ void scsi_exit_queue(void)
|
|||
{
|
||||
int i;
|
||||
|
||||
kmem_cache_destroy(scsi_io_context_cache);
|
||||
kmem_cache_destroy(scsi_sdb_cache);
|
||||
|
||||
for (i = 0; i < SG_MEMPOOL_NR; i++) {
|
||||
|
|
|
|||
|
|
@ -371,12 +371,6 @@ extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
|
|||
int data_direction, void *buffer, unsigned bufflen,
|
||||
struct scsi_sense_hdr *, int timeout, int retries,
|
||||
int *resid);
|
||||
extern int scsi_execute_async(struct scsi_device *sdev,
|
||||
const unsigned char *cmd, int cmd_len, int data_direction,
|
||||
void *buffer, unsigned bufflen, int use_sg,
|
||||
int timeout, int retries, void *privdata,
|
||||
void (*done)(void *, char *, int, int),
|
||||
gfp_t gfp);
|
||||
|
||||
static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in New Issue