/* * Partial completion handling for request-based dm */ static void end_clone_bio(struct bio *clone) { struct dm_rq_clone_bio_info *info = container_of(clone, struct dm_rq_clone_bio_info, clone); struct dm_rq_target_io *tio = info->tio; struct bio *bio = info->orig; unsigned int nr_bytes = info->orig->bi_iter.bi_size; int error = clone->bi_error; bio_put(clone); if (tio->error) /* * An error has already been detected on the request. * Once error occurred, just let clone->end_io() handle * the remainder. */ return; else if (error) { /* * Don't notice the error to the upper layer yet. * The error handling decision is made by the target driver, * when the request is completed. */ tio->error = error; return; } /* * I/O for the bio successfully completed. * Notice the data completion to the upper layer. */ /* * bios are processed from the head of the list. * So the completing bio should always be rq->bio. * If it's not, something wrong is happening. */ if (tio->orig->bio != bio) DMERR("bio completion is going in the middle of the request"); /* * Update the original request. * Do not use blk_end_request() here, because it may complete * the original request before the clone, and break the ordering. */ blk_update_request(tio->orig, 0, nr_bytes); }
/* * Partial completion handling for request-based dm */ static void end_clone_bio(struct bio *clone) { struct dm_rq_clone_bio_info *info = container_of(clone, struct dm_rq_clone_bio_info, clone); struct dm_rq_target_io *tio = info->tio; unsigned int nr_bytes = info->orig->bi_iter.bi_size; blk_status_t error = clone->bi_status; bool is_last = !clone->bi_next; bio_put(clone); if (tio->error) /* * An error has already been detected on the request. * Once error occurred, just let clone->end_io() handle * the remainder. */ return; else if (error) { /* * Don't notice the error to the upper layer yet. * The error handling decision is made by the target driver, * when the request is completed. */ tio->error = error; goto exit; } /* * I/O for the bio successfully completed. * Notice the data completion to the upper layer. */ tio->completed += nr_bytes; /* * Update the original request. * Do not use blk_end_request() here, because it may complete * the original request before the clone, and break the ordering. */ if (is_last) exit: blk_update_request(tio->orig, BLK_STS_OK, tio->completed); }
static irqreturn_t swim3_interrupt(int irq, void *dev_id) { struct floppy_state *fs = (struct floppy_state *) dev_id; struct swim3 __iomem *sw = fs->swim3; int intr, err, n; int stat, resid; struct dbdma_regs __iomem *dr; struct dbdma_cmd *cp; intr = in_8(&sw->intr); err = (intr & ERROR_INTR)? in_8(&sw->error): 0; if ((intr & ERROR_INTR) && fs->state != do_transfer) printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n", fs->state, rq_data_dir(fd_req), intr, err); switch (fs->state) { case locating: if (intr & SEEN_SECTOR) { out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); out_8(&sw->select, RELAX); out_8(&sw->intr_enable, 0); del_timer(&fs->timeout); fs->timeout_pending = 0; if (sw->ctrack == 0xff) { printk(KERN_ERR "swim3: seen sector but cyl=ff?\n"); fs->cur_cyl = -1; if (fs->retries > 5) { swim3_end_request_cur(-EIO); fs->state = idle; start_request(fs); } else { fs->state = jogging; act(fs); } break; } fs->cur_cyl = sw->ctrack; fs->cur_sector = sw->csect; if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) printk(KERN_ERR "swim3: expected cyl %d, got %d\n", fs->expect_cyl, fs->cur_cyl); fs->state = do_transfer; act(fs); } break; case seeking: case jogging: if (sw->nseek == 0) { out_8(&sw->control_bic, DO_SEEK); out_8(&sw->select, RELAX); out_8(&sw->intr_enable, 0); del_timer(&fs->timeout); fs->timeout_pending = 0; if (fs->state == seeking) ++fs->retries; fs->state = settling; act(fs); } break; case settling: out_8(&sw->intr_enable, 0); del_timer(&fs->timeout); fs->timeout_pending = 0; act(fs); break; case do_transfer: if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) break; out_8(&sw->intr_enable, 0); out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); out_8(&sw->select, RELAX); del_timer(&fs->timeout); fs->timeout_pending = 0; dr = fs->dma; cp = fs->dma_cmd; if (rq_data_dir(fd_req) == WRITE) ++cp; /* * Check that the main data transfer has finished. * On writing, the swim3 sometimes doesn't use * up all the bytes of the postamble, so we can still * see DMA active here. That doesn't matter as long * as all the sector data has been transferred. */ if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { /* wait a little while for DMA to complete */ for (n = 0; n < 100; ++n) { if (cp->xfer_status != 0) break; udelay(1); barrier(); } } /* turn off DMA */ out_le32(&dr->control, (RUN | PAUSE) << 16); stat = ld_le16(&cp->xfer_status); resid = ld_le16(&cp->res_count); if (intr & ERROR_INTR) { n = fs->scount - 1 - resid / 512; if (n > 0) { blk_update_request(fd_req, 0, n << 9); fs->req_sector += n; } if (fs->retries < 5) { ++fs->retries; act(fs); } else { printk("swim3: error %sing block %ld (err=%x)\n", rq_data_dir(fd_req) == WRITE? "writ": "read", (long)blk_rq_pos(fd_req), err); swim3_end_request_cur(-EIO); fs->state = idle; } } else { if ((stat & ACTIVE) == 0 || resid != 0) { /* musta been an error */ printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid); printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n", fs->state, rq_data_dir(fd_req), intr, err); swim3_end_request_cur(-EIO); fs->state = idle; start_request(fs); break; } if (swim3_end_request(0, fs->scount << 9)) { fs->req_sector += fs->scount; if (fs->req_sector > fs->secpertrack) { fs->req_sector -= fs->secpertrack; if (++fs->head > 1) { fs->head = 0; ++fs->req_cyl; } } act(fs); } else fs->state = idle; } if (fs->state == idle) start_request(fs); break; default: printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state); } return IRQ_HANDLED; }