From 6620742f72d2fcf311e3fc8aa2476daa91fa3f31 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Thu, 18 Dec 2008 14:49:43 +0900 Subject: [SCSI] st: convert dio path to use st_scsi_execute This patch converts the dio path (mmap) to use st_scsi_execute. IOW, it removes scsi_execute_async in the non dio path. scsi_execute_async has gone! This also remove unused st_sleep_done. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley --- drivers/scsi/st.c | 76 +++++++++++++++++-------------------------------------- 1 file changed, 23 insertions(+), 53 deletions(-) (limited to 'drivers/scsi/st.c') diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 390689d5fdf..fec5568c711 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -191,9 +191,9 @@ static int from_buffer(struct st_buffer *, char __user *, int); static void move_buffer_data(struct st_buffer *, int); static void buf_to_sg(struct st_buffer *, unsigned int); -static int sgl_map_user_pages(struct scatterlist *, const unsigned int, +static int sgl_map_user_pages(struct st_buffer *, const unsigned int, unsigned long, size_t, int); -static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int); +static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); static int st_probe(struct device *); static int st_remove(struct device *); @@ -435,22 +435,6 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) return (-EIO); } - -/* Wakeup from interrupt */ -static void st_sleep_done(void *data, char *sense, int result, int resid) -{ - struct st_request *SRpnt = data; - struct scsi_tape *STp = SRpnt->stp; - - memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE); - (STp->buffer)->cmdstat.midlevel_result = SRpnt->result = result; - (STp->buffer)->cmdstat.residual = resid; - DEB( STp->write_pending = 0; ) - - if (SRpnt->waiting) - complete(SRpnt->waiting); -} - static struct st_request *st_allocate_request(struct scsi_tape *stp) { struct st_request *streq; @@ -566,7 +550,10 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd init_completion(waiting); SRpnt->waiting = waiting; - if (!STp->buffer->do_dio) { + if (STp->buffer->do_dio) { + mdata->nr_entries = STp->buffer->sg_segs; + mdata->pages = STp->buffer->mapped_pages; + } else { buf_to_sg(STp->buffer, bytes); mdata->nr_entries = @@ -579,16 +566,8 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd STp->buffer->cmdstat.have_sense = 0; STp->buffer->syscall_result = 0; - if (STp->buffer->do_dio) - ret = scsi_execute_async(STp->device, cmd, COMMAND_SIZE(cmd[0]), - direction, &((STp->buffer)->sg[0]), - bytes, (STp->buffer)->sg_segs, timeout, - retries, SRpnt, st_sleep_done, - GFP_KERNEL); - else - ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, - timeout, retries); - + ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, + retries); if (ret) { /* could not allocate the buffer or request was too large */ (STp->buffer)->syscall_result = (-EBUSY); @@ -1540,8 +1519,8 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf, if (i && ((unsigned long)buf & queue_dma_alignment( STp->device->request_queue)) == 0) { - i = sgl_map_user_pages(&(STbp->sg[0]), STbp->use_sg, - (unsigned long)buf, count, (is_read ? READ : WRITE)); + i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, + count, (is_read ? READ : WRITE)); if (i > 0) { STbp->do_dio = i; STbp->buffer_bytes = 0; /* can be used as transfer counter */ @@ -1595,7 +1574,7 @@ static void release_buffering(struct scsi_tape *STp, int is_read) STbp = STp->buffer; if (STbp->do_dio) { - sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, is_read); + sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); STbp->do_dio = 0; STbp->sg_segs = 0; } @@ -4647,14 +4626,16 @@ out: } /* The following functions may be useful for a larger audience. */ -static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, - unsigned long uaddr, size_t count, int rw) +static int sgl_map_user_pages(struct st_buffer *STbp, + const unsigned int max_pages, unsigned long uaddr, + size_t count, int rw) { unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned long start = uaddr >> PAGE_SHIFT; const int nr_pages = end - start; int res, i, j; struct page **pages; + struct rq_map_data *mdata = &STbp->map_data; /* User attempted Overflow! */ if ((uaddr + count) < uaddr) @@ -4696,24 +4677,11 @@ static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pa flush_dcache_page(pages[i]); } - /* Populate the scatter/gather list */ - sg_set_page(&sgl[0], pages[0], 0, uaddr & ~PAGE_MASK); - if (nr_pages > 1) { - sgl[0].length = PAGE_SIZE - sgl[0].offset; - count -= sgl[0].length; - for (i=1; i < nr_pages ; i++) { - sg_set_page(&sgl[i], pages[i], - count < PAGE_SIZE ? count : PAGE_SIZE, 0);; - count -= PAGE_SIZE; - } - } - else { - sgl[0].length = count; - } + mdata->offset = uaddr & ~PAGE_MASK; + mdata->page_order = 0; + STbp->mapped_pages = pages; - kfree(pages); return nr_pages; - out_unmap: if (res > 0) { for (j=0; j < res; j++) @@ -4726,13 +4694,13 @@ static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pa /* And unmap them... */ -static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, - int dirtied) +static int sgl_unmap_user_pages(struct st_buffer *STbp, + const unsigned int nr_pages, int dirtied) { int i; for (i=0; i < nr_pages; i++) { - struct page *page = sg_page(&sgl[i]); + struct page *page = STbp->mapped_pages[i]; if (dirtied) SetPageDirty(page); @@ -4741,6 +4709,8 @@ static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_p */ page_cache_release(page); } + kfree(STbp->mapped_pages); + STbp->mapped_pages = NULL; return 0; } -- cgit v1.2.3