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[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
3 changed files with 25 additions and 218 deletions
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@ -1441,6 +1441,11 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
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}
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}
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static void eh_lock_door_done(struct request *req, int uptodate)
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{
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__blk_put_request(req->q, req);
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}
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/**
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* scsi_eh_lock_door - Prevent medium removal for the specified device
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* @sdev: SCSI device to prevent medium removal
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@ -1463,20 +1468,29 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
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*/
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static void scsi_eh_lock_door(struct scsi_device *sdev)
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{
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unsigned char cmnd[MAX_COMMAND_SIZE];
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struct request *req;
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cmnd[0] = ALLOW_MEDIUM_REMOVAL;
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cmnd[1] = 0;
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cmnd[2] = 0;
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cmnd[3] = 0;
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cmnd[4] = SCSI_REMOVAL_PREVENT;
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cmnd[5] = 0;
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req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL);
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if (!req)
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return;
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scsi_execute_async(sdev, cmnd, 6, DMA_NONE, NULL, 0, 0, 10 * HZ,
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5, NULL, NULL, GFP_KERNEL);
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req->cmd[0] = ALLOW_MEDIUM_REMOVAL;
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req->cmd[1] = 0;
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req->cmd[2] = 0;
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req->cmd[3] = 0;
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req->cmd[4] = SCSI_REMOVAL_PREVENT;
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req->cmd[5] = 0;
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req->cmd_len = COMMAND_SIZE(req->cmd[0]);
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req->cmd_type = REQ_TYPE_BLOCK_PC;
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req->cmd_flags |= REQ_QUIET;
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req->timeout = 10 * HZ;
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req->retries = 5;
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blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done);
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}
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/**
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* scsi_restart_operations - restart io operations to the specified host.
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* @shost: Host we are restarting.
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@ -277,196 +277,6 @@ int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
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}
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EXPORT_SYMBOL(scsi_execute_req);
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struct scsi_io_context {
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void *data;
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void (*done)(void *data, char *sense, int result, int resid);
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char sense[SCSI_SENSE_BUFFERSIZE];
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};
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static struct kmem_cache *scsi_io_context_cache;
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static void scsi_end_async(struct request *req, int uptodate)
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{
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struct scsi_io_context *sioc = req->end_io_data;
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if (sioc->done)
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sioc->done(sioc->data, sioc->sense, req->errors, req->data_len);
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kmem_cache_free(scsi_io_context_cache, sioc);
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__blk_put_request(req->q, req);
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}
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static int scsi_merge_bio(struct request *rq, struct bio *bio)
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{
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struct request_queue *q = rq->q;
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bio->bi_flags &= ~(1 << BIO_SEG_VALID);
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if (rq_data_dir(rq) == WRITE)
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bio->bi_rw |= (1 << BIO_RW);
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blk_queue_bounce(q, &bio);
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return blk_rq_append_bio(q, rq, bio);
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}
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static void scsi_bi_endio(struct bio *bio, int error)
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{
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bio_put(bio);
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}
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/**
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* scsi_req_map_sg - map a scatterlist into a request
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* @rq: request to fill
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* @sgl: scatterlist
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* @nsegs: number of elements
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* @bufflen: len of buffer
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* @gfp: memory allocation flags
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*
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* scsi_req_map_sg maps a scatterlist into a request so that the
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* request can be sent to the block layer. We do not trust the scatterlist
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* sent to use, as some ULDs use that struct to only organize the pages.
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*/
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static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
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int nsegs, unsigned bufflen, gfp_t gfp)
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{
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struct request_queue *q = rq->q;
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int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
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unsigned int data_len = bufflen, len, bytes, off;
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struct scatterlist *sg;
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struct page *page;
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struct bio *bio = NULL;
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int i, err, nr_vecs = 0;
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for_each_sg(sgl, sg, nsegs, i) {
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page = sg_page(sg);
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off = sg->offset;
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len = sg->length;
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while (len > 0 && data_len > 0) {
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/*
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* sg sends a scatterlist that is larger than
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* the data_len it wants transferred for certain
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* IO sizes
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*/
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bytes = min_t(unsigned int, len, PAGE_SIZE - off);
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bytes = min(bytes, data_len);
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if (!bio) {
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nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
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nr_pages -= nr_vecs;
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bio = bio_alloc(gfp, nr_vecs);
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if (!bio) {
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err = -ENOMEM;
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goto free_bios;
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}
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bio->bi_end_io = scsi_bi_endio;
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}
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if (bio_add_pc_page(q, bio, page, bytes, off) !=
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bytes) {
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bio_put(bio);
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err = -EINVAL;
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goto free_bios;
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}
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if (bio->bi_vcnt >= nr_vecs) {
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err = scsi_merge_bio(rq, bio);
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if (err) {
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bio_endio(bio, 0);
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goto free_bios;
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}
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bio = NULL;
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}
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page++;
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len -= bytes;
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data_len -=bytes;
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off = 0;
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}
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}
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rq->buffer = rq->data = NULL;
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rq->data_len = bufflen;
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return 0;
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free_bios:
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while ((bio = rq->bio) != NULL) {
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rq->bio = bio->bi_next;
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/*
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* call endio instead of bio_put incase it was bounced
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*/
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bio_endio(bio, 0);
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}
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return err;
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}
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/**
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* scsi_execute_async - insert request
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* @sdev: scsi device
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* @cmd: scsi command
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* @cmd_len: length of scsi cdb
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* @data_direction: DMA_TO_DEVICE, DMA_FROM_DEVICE, or DMA_NONE
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* @buffer: data buffer (this can be a kernel buffer or scatterlist)
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* @bufflen: len of buffer
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* @use_sg: if buffer is a scatterlist this is the number of elements
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* @timeout: request timeout in seconds
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* @retries: number of times to retry request
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* @privdata: data passed to done()
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* @done: callback function when done
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* @gfp: memory allocation flags
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*/
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int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
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int cmd_len, int data_direction, void *buffer, unsigned bufflen,
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int use_sg, int timeout, int retries, void *privdata,
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void (*done)(void *, char *, int, int), gfp_t gfp)
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{
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struct request *req;
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struct scsi_io_context *sioc;
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int err = 0;
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int write = (data_direction == DMA_TO_DEVICE);
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sioc = kmem_cache_zalloc(scsi_io_context_cache, gfp);
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if (!sioc)
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return DRIVER_ERROR << 24;
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req = blk_get_request(sdev->request_queue, write, gfp);
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if (!req)
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goto free_sense;
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req->cmd_type = REQ_TYPE_BLOCK_PC;
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req->cmd_flags |= REQ_QUIET;
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if (use_sg)
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err = scsi_req_map_sg(req, buffer, use_sg, bufflen, gfp);
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else if (bufflen)
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err = blk_rq_map_kern(req->q, req, buffer, bufflen, gfp);
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if (err)
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goto free_req;
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req->cmd_len = cmd_len;
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memset(req->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
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memcpy(req->cmd, cmd, req->cmd_len);
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req->sense = sioc->sense;
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req->sense_len = 0;
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req->timeout = timeout;
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req->retries = retries;
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req->end_io_data = sioc;
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sioc->data = privdata;
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sioc->done = done;
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blk_execute_rq_nowait(req->q, NULL, req, 1, scsi_end_async);
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return 0;
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free_req:
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blk_put_request(req);
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free_sense:
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kmem_cache_free(scsi_io_context_cache, sioc);
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return DRIVER_ERROR << 24;
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}
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EXPORT_SYMBOL_GPL(scsi_execute_async);
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/*
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* Function: scsi_init_cmd_errh()
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*
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@ -1920,20 +1730,12 @@ int __init scsi_init_queue(void)
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{
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int i;
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scsi_io_context_cache = kmem_cache_create("scsi_io_context",
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sizeof(struct scsi_io_context),
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0, 0, NULL);
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if (!scsi_io_context_cache) {
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printk(KERN_ERR "SCSI: can't init scsi io context cache\n");
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return -ENOMEM;
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}
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scsi_sdb_cache = kmem_cache_create("scsi_data_buffer",
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sizeof(struct scsi_data_buffer),
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0, 0, NULL);
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if (!scsi_sdb_cache) {
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printk(KERN_ERR "SCSI: can't init scsi sdb cache\n");
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goto cleanup_io_context;
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return -ENOMEM;
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}
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for (i = 0; i < SG_MEMPOOL_NR; i++) {
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@ -1968,8 +1770,6 @@ cleanup_sdb:
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kmem_cache_destroy(sgp->slab);
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}
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kmem_cache_destroy(scsi_sdb_cache);
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cleanup_io_context:
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kmem_cache_destroy(scsi_io_context_cache);
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return -ENOMEM;
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}
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@ -1978,7 +1778,6 @@ void scsi_exit_queue(void)
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{
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int i;
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kmem_cache_destroy(scsi_io_context_cache);
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kmem_cache_destroy(scsi_sdb_cache);
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for (i = 0; i < SG_MEMPOOL_NR; i++) {
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@ -371,12 +371,6 @@ extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
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int data_direction, void *buffer, unsigned bufflen,
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struct scsi_sense_hdr *, int timeout, int retries,
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int *resid);
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extern int scsi_execute_async(struct scsi_device *sdev,
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const unsigned char *cmd, int cmd_len, int data_direction,
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void *buffer, unsigned bufflen, int use_sg,
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int timeout, int retries, void *privdata,
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void (*done)(void *, char *, int, int),
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gfp_t gfp);
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static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
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{
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