Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (80 commits)
  ide-floppy: fix unfortunate function naming
  ide-tape: unify idetape_create_read/write_cmd
  ide: add ide_pc_intr() helper
  ide-{floppy,scsi}: read Status Register before stopping DMA engine
  ide-scsi: add more debugging to idescsi_pc_intr()
  ide-scsi: use pc->callback
  ide-floppy: add more debugging to idefloppy_pc_intr()
  ide-tape: always log debug info in idetape_pc_intr() if debugging is enabled
  ide-tape: add ide_tape_io_buffers() helper
  ide-tape: factor out DSC handling from idetape_pc_intr()
  ide-{floppy,tape}: move checking of ->failed_pc to ->callback
  ide: add ide_issue_pc() helper
  ide: add PC_FLAG_DRQ_INTERRUPT pc flag
  ide-scsi: move idescsi_map_sg() call out from idescsi_issue_pc()
  ide: add ide_transfer_pc() helper
  ide-scsi: set drive->scsi flag for devices handled by the driver
  ide-{cd,floppy,tape}: remove checking for drive->scsi
  ide: add PC_FLAG_ZIP_DRIVE pc flag
  ide-tape: factor out waiting for good ireason from idetape_transfer_pc()
  ide-tape: set PC_FLAG_DMA_IN_PROGRESS flag in idetape_transfer_pc()
  ...

1 files changed, 158 insertions, 403 deletions

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index a3d228302d20..f9cf1670e4e1 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -144,9 +144,6 @@ enum {
 
 /*************************** End of tunable parameters ***********************/
 
-/* Read/Write error simulation */
-#define SIMULATE_ERRORS                 0
-
 /* tape directions */
 enum {
         IDETAPE_DIR_NONE  = (1 << 0),
@@ -442,7 +439,7 @@ static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
         }
 }
 
-static void idetape_update_buffers(struct ide_atapi_pc *pc)
+static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
 {
         struct idetape_bh *bh = pc->bh;
         int count;
@@ -506,18 +503,6 @@ static struct request *idetape_next_rq_storage(ide_drive_t *drive)
         return (&tape->rq_stack[tape->rq_stack_index++]);
 }
 
-static void idetape_init_pc(struct ide_atapi_pc *pc)
-{
-        memset(pc->c, 0, 12);
-        pc->retries = 0;
-        pc->flags = 0;
-        pc->req_xfer = 0;
-        pc->buf = pc->pc_buf;
-        pc->buf_size = IDETAPE_PC_BUFFER_SIZE;
-        pc->bh = NULL;
-        pc->b_data = NULL;
-}
-
 /*
  * called on each failed packet command retry to analyze the request sense. We
  * currently do not utilize this information.
@@ -538,8 +523,8 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
         if (pc->flags & PC_FLAG_DMA_ERROR) {
                 pc->xferred = pc->req_xfer -
                         tape->blk_size *
-                        be32_to_cpu(get_unaligned((u32 *)&sense[3]));
-                idetape_update_buffers(pc);
+                        get_unaligned_be32(&sense[3]);
+                idetape_update_buffers(drive, pc);
         }
 
         /*
@@ -634,21 +619,78 @@ static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
         return 0;
 }
 
-static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive)
+static void ide_tape_callback(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
+        struct ide_atapi_pc *pc = tape->pc;
+        int uptodate = pc->error ? 0 : 1;
 
         debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
-        if (!tape->pc->error) {
-                idetape_analyze_error(drive, tape->pc->buf);
-                idetape_end_request(drive, 1, 0);
-        } else {
-                printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - "
-                                "Aborting request!\n");
-                idetape_end_request(drive, 0, 0);
+        if (tape->failed_pc == pc)
+                tape->failed_pc = NULL;
+
+        if (pc->c[0] == REQUEST_SENSE) {
+                if (uptodate)
+                        idetape_analyze_error(drive, pc->buf);
+                else
+                        printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
+                                        "itself - Aborting request!\n");
+        } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
+                struct request *rq = drive->hwif->hwgroup->rq;
+                int blocks = pc->xferred / tape->blk_size;
+
+                tape->avg_size += blocks * tape->blk_size;
+
+                if (time_after_eq(jiffies, tape->avg_time + HZ)) {
+                        tape->avg_speed = tape->avg_size * HZ /
+                                (jiffies - tape->avg_time) / 1024;
+                        tape->avg_size = 0;
+                        tape->avg_time = jiffies;
+                }
+
+                tape->first_frame += blocks;
+                rq->current_nr_sectors -= blocks;
+
+                if (pc->error)
+                        uptodate = pc->error;
+        } else if (pc->c[0] == READ_POSITION && uptodate) {
+                u8 *readpos = tape->pc->buf;
+
+                debug_log(DBG_SENSE, "BOP - %s\n",
+                                (readpos[0] & 0x80) ? "Yes" : "No");
+                debug_log(DBG_SENSE, "EOP - %s\n",
+                                (readpos[0] & 0x40) ? "Yes" : "No");
+
+                if (readpos[0] & 0x4) {
+                        printk(KERN_INFO "ide-tape: Block location is unknown"
+                                         "to the tape\n");
+                        clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
+                        uptodate = 0;
+                } else {
+                        debug_log(DBG_SENSE, "Block Location - %u\n",
+                                        be32_to_cpu(*(u32 *)&readpos[4]));
+
+                        tape->partition = readpos[1];
+                        tape->first_frame = be32_to_cpu(*(u32 *)&readpos[4]);
+                        set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
+                }
         }
-        return ide_stopped;
+
+        idetape_end_request(drive, uptodate, 0);
+}
+
+static void idetape_init_pc(struct ide_atapi_pc *pc)
+{
+        memset(pc->c, 0, 12);
+        pc->retries = 0;
+        pc->flags = 0;
+        pc->req_xfer = 0;
+        pc->buf = pc->pc_buf;
+        pc->buf_size = IDETAPE_PC_BUFFER_SIZE;
+        pc->bh = NULL;
+        pc->b_data = NULL;
+        pc->callback = ide_tape_callback;
 }
 
 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
@@ -657,7 +699,6 @@ static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
         pc->c[0] = REQUEST_SENSE;
         pc->c[4] = 20;
         pc->req_xfer = 20;
-        pc->idetape_callback = &idetape_request_sense_callback;
 }
 
 static void idetape_init_rq(struct request *rq, u8 cmd)
@@ -688,9 +729,10 @@ static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
         struct ide_tape_obj *tape = drive->driver_data;
 
         idetape_init_rq(rq, REQ_IDETAPE_PC1);
+        rq->cmd_flags |= REQ_PREEMPT;
         rq->buffer = (char *) pc;
         rq->rq_disk = tape->disk;
-        (void) ide_do_drive_cmd(drive, rq, ide_preempt);
+        ide_do_drive_cmd(drive, rq);
 }
 
 /*
@@ -698,7 +740,7 @@ static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
  *      last packet command. We queue a request sense packet command in
  *      the head of the request list.
  */
-static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
+static void idetape_retry_pc(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         struct ide_atapi_pc *pc;
@@ -710,7 +752,6 @@ static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
         idetape_create_request_sense_cmd(pc);
         set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
         idetape_queue_pc_head(drive, pc, rq);
-        return ide_stopped;
 }
 
 /*
@@ -727,7 +768,26 @@ static void idetape_postpone_request(ide_drive_t *drive)
         ide_stall_queue(drive, tape->dsc_poll_freq);
 }
 
-typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int);
+static void ide_tape_handle_dsc(ide_drive_t *drive)
+{
+        idetape_tape_t *tape = drive->driver_data;
+
+        /* Media access command */
+        tape->dsc_polling_start = jiffies;
+        tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
+        tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
+        /* Allow ide.c to handle other requests */
+        idetape_postpone_request(drive);
+}
+
+static void ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
+                                unsigned int bcount, int write)
+{
+        if (write)
+                idetape_output_buffers(drive, pc, bcount);
+        else
+                idetape_input_buffers(drive, pc, bcount);
+}
 
 /*
  * This is the usual interrupt handler which will be called during a packet
@@ -738,169 +798,11 @@ typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int);
  */
 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
 {
-        ide_hwif_t *hwif = drive->hwif;
         idetape_tape_t *tape = drive->driver_data;
-        struct ide_atapi_pc *pc = tape->pc;
-        xfer_func_t *xferfunc;
-        idetape_io_buf *iobuf;
-        unsigned int temp;
-#if SIMULATE_ERRORS
-        static int error_sim_count;
-#endif
-        u16 bcount;
-        u8 stat, ireason;
-
-        debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
-
-        /* Clear the interrupt */
-        stat = ide_read_status(drive);
-
-        if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
-                if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) {
-                        /*
-                         * A DMA error is sometimes expected. For example,
-                         * if the tape is crossing a filemark during a
-                         * READ command, it will issue an irq and position
-                         * itself before the filemark, so that only a partial
-                         * data transfer will occur (which causes the DMA
-                         * error). In that case, we will later ask the tape
-                         * how much bytes of the original request were
-                         * actually transferred (we can't receive that
-                         * information from the DMA engine on most chipsets).
-                         */
-
-                        /*
-                         * On the contrary, a DMA error is never expected;
-                         * it usually indicates a hardware error or abort.
-                         * If the tape crosses a filemark during a READ
-                         * command, it will issue an irq and position itself
-                         * after the filemark (not before). Only a partial
-                         * data transfer will occur, but no DMA error.
-                         * (AS, 19 Apr 2001)
-                         */
-                        pc->flags |= PC_FLAG_DMA_ERROR;
-                } else {
-                        pc->xferred = pc->req_xfer;
-                        idetape_update_buffers(pc);
-                }
-                debug_log(DBG_PROCS, "DMA finished\n");
-
-        }
-
-        /* No more interrupts */
-        if ((stat & DRQ_STAT) == 0) {
-                debug_log(DBG_SENSE, "Packet command completed, %d bytes"
-                                " transferred\n", pc->xferred);
-
-                pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
-                local_irq_enable();
-
-#if SIMULATE_ERRORS
-                if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
-                    (++error_sim_count % 100) == 0) {
-                        printk(KERN_INFO "ide-tape: %s: simulating error\n",
-                                tape->name);
-                        stat |= ERR_STAT;
-                }
-#endif
-                if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
-                        stat &= ~ERR_STAT;
-                if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
-                        /* Error detected */
-                        debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
-
-                        if (pc->c[0] == REQUEST_SENSE) {
-                                printk(KERN_ERR "ide-tape: I/O error in request"
-                                                " sense command\n");
-                                return ide_do_reset(drive);
-                        }
-                        debug_log(DBG_ERR, "[cmd %x]: check condition\n",
-                                        pc->c[0]);
-
-                        /* Retry operation */
-                        return idetape_retry_pc(drive);
-                }
-                pc->error = 0;
-                if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
-                    (stat & SEEK_STAT) == 0) {
-                        /* Media access command */
-                        tape->dsc_polling_start = jiffies;
-                        tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
-                        tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
-                        /* Allow ide.c to handle other requests */
-                        idetape_postpone_request(drive);
-                        return ide_stopped;
-                }
-                if (tape->failed_pc == pc)
-                        tape->failed_pc = NULL;
-                /* Command finished - Call the callback function */
-                return pc->idetape_callback(drive);
-        }
-
-        if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
-                pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
-                printk(KERN_ERR "ide-tape: The tape wants to issue more "
-                                "interrupts in DMA mode\n");
-                printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
-                ide_dma_off(drive);
-                return ide_do_reset(drive);
-        }
-        /* Get the number of bytes to transfer on this interrupt. */
-        bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
-                  hwif->INB(hwif->io_ports.lbam_addr);
-
-        ireason = hwif->INB(hwif->io_ports.nsect_addr);
-
-        if (ireason & CD) {
-                printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
-                return ide_do_reset(drive);
-        }
-        if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
-                /* Hopefully, we will never get here */
-                printk(KERN_ERR "ide-tape: We wanted to %s, ",
-                                (ireason & IO) ? "Write" : "Read");
-                printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
-                                (ireason & IO) ? "Read" : "Write");
-                return ide_do_reset(drive);
-        }
-        if (!(pc->flags & PC_FLAG_WRITING)) {
-                /* Reading - Check that we have enough space */
-                temp = pc->xferred + bcount;
-                if (temp > pc->req_xfer) {
-                        if (temp > pc->buf_size) {
-                                printk(KERN_ERR "ide-tape: The tape wants to "
-                                        "send us more data than expected "
-                                        "- discarding data\n");
-                                ide_pad_transfer(drive, 0, bcount);
-                                ide_set_handler(drive, &idetape_pc_intr,
-                                                IDETAPE_WAIT_CMD, NULL);
-                                return ide_started;
-                        }
-                        debug_log(DBG_SENSE, "The tape wants to send us more "
-                                "data than expected - allowing transfer\n");
-                }
-                iobuf = &idetape_input_buffers;
-                xferfunc = hwif->input_data;
-        } else {
-                iobuf = &idetape_output_buffers;
-                xferfunc = hwif->output_data;
-        }
-
-        if (pc->bh)
-                iobuf(drive, pc, bcount);
-        else
-                xferfunc(drive, NULL, pc->cur_pos, bcount);
-
-        /* Update the current position */
-        pc->xferred += bcount;
-        pc->cur_pos += bcount;
-
-        debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
-                        pc->c[0], bcount);
 
-        /* And set the interrupt handler again */
-        ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
-        return ide_started;
+        return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD,
+                           NULL, idetape_update_buffers, idetape_retry_pc,
+                           ide_tape_handle_dsc, ide_tape_io_buffers);
 }
 
 /*
@@ -941,56 +843,16 @@ static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
  */
 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
 {
-        ide_hwif_t *hwif = drive->hwif;
         idetape_tape_t *tape = drive->driver_data;
-        struct ide_atapi_pc *pc = tape->pc;
-        int retries = 100;
-        ide_startstop_t startstop;
-        u8 ireason;
-
-        if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
-                printk(KERN_ERR "ide-tape: Strange, packet command initiated "
-                                "yet DRQ isn't asserted\n");
-                return startstop;
-        }
-        ireason = hwif->INB(hwif->io_ports.nsect_addr);
-        while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
-                printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
-                                "a packet command, retrying\n");
-                udelay(100);
-                ireason = hwif->INB(hwif->io_ports.nsect_addr);
-                if (retries == 0) {
-                        printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
-                                        "issuing a packet command, ignoring\n");
-                        ireason |= CD;
-                        ireason &= ~IO;
-                }
-        }
-        if ((ireason & CD) == 0 || (ireason & IO)) {
-                printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
-                                "a packet command\n");
-                return ide_do_reset(drive);
-        }
-        /* Set the interrupt routine */
-        ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
-#ifdef CONFIG_BLK_DEV_IDEDMA
-        /* Begin DMA, if necessary */
-        if (pc->flags & PC_FLAG_DMA_IN_PROGRESS)
-                hwif->dma_ops->dma_start(drive);
-#endif
-        /* Send the actual packet */
-        hwif->output_data(drive, NULL, pc->c, 12);
 
-        return ide_started;
+        return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
+                               IDETAPE_WAIT_CMD, NULL);
 }
 
 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
                 struct ide_atapi_pc *pc)
 {
-        ide_hwif_t *hwif = drive->hwif;
         idetape_tape_t *tape = drive->driver_data;
-        int dma_ok = 0;
-        u16 bcount;
 
         if (tape->pc->c[0] == REQUEST_SENSE &&
             pc->c[0] == REQUEST_SENSE) {
@@ -1025,50 +887,15 @@ static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
                         pc->error = IDETAPE_ERROR_GENERAL;
                 }
                 tape->failed_pc = NULL;
-                return pc->idetape_callback(drive);
+                pc->callback(drive);
+                return ide_stopped;
         }
         debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
 
         pc->retries++;
-        /* We haven't transferred any data yet */
-        pc->xferred = 0;
-        pc->cur_pos = pc->buf;
-        /* Request to transfer the entire buffer at once */
-        bcount = pc->req_xfer;
 
-        if (pc->flags & PC_FLAG_DMA_ERROR) {
-                pc->flags &= ~PC_FLAG_DMA_ERROR;
-                printk(KERN_WARNING "ide-tape: DMA disabled, "
-                                "reverting to PIO\n");
-                ide_dma_off(drive);
-        }
-        if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma)
-                dma_ok = !hwif->dma_ops->dma_setup(drive);
-
-        ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
-                           IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
-
-        if (dma_ok)
-                /* Will begin DMA later */
-                pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
-        if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) {
-                ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
-                                    IDETAPE_WAIT_CMD, NULL);
-                return ide_started;
-        } else {
-                ide_execute_pkt_cmd(drive);
-                return idetape_transfer_pc(drive);
-        }
-}
-
-static ide_startstop_t idetape_pc_callback(ide_drive_t *drive)
-{
-        idetape_tape_t *tape = drive->driver_data;
-
-        debug_log(DBG_PROCS, "Enter %s\n", __func__);
-
-        idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
-        return ide_stopped;
+        return ide_issue_pc(drive, pc, idetape_transfer_pc,
+                            IDETAPE_WAIT_CMD, NULL);
 }
 
 /* A mode sense command is used to "sense" tape parameters. */
@@ -1096,7 +923,6 @@ static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
                 pc->req_xfer = 24;
         else
                 pc->req_xfer = 50;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
@@ -1114,80 +940,41 @@ static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
                                 printk(KERN_ERR "ide-tape: %s: I/O error, ",
                                                 tape->name);
                         /* Retry operation */
-                        return idetape_retry_pc(drive);
+                        idetape_retry_pc(drive);
+                        return ide_stopped;
                 }
                 pc->error = 0;
-                if (tape->failed_pc == pc)
-                        tape->failed_pc = NULL;
         } else {
                 pc->error = IDETAPE_ERROR_GENERAL;
                 tape->failed_pc = NULL;
         }
-        return pc->idetape_callback(drive);
-}
-
-static ide_startstop_t idetape_rw_callback(ide_drive_t *drive)
-{
-        idetape_tape_t *tape = drive->driver_data;
-        struct request *rq = HWGROUP(drive)->rq;
-        int blocks = tape->pc->xferred / tape->blk_size;
-
-        tape->avg_size += blocks * tape->blk_size;
-
-        if (time_after_eq(jiffies, tape->avg_time + HZ)) {
-                tape->avg_speed = tape->avg_size * HZ /
-                                (jiffies - tape->avg_time) / 1024;
-                tape->avg_size = 0;
-                tape->avg_time = jiffies;
-        }
-        debug_log(DBG_PROCS, "Enter %s\n", __func__);
-
-        tape->first_frame += blocks;
-        rq->current_nr_sectors -= blocks;
-
-        if (!tape->pc->error)
-                idetape_end_request(drive, 1, 0);
-        else
-                idetape_end_request(drive, tape->pc->error, 0);
+        pc->callback(drive);
         return ide_stopped;
 }
 
-static void idetape_create_read_cmd(idetape_tape_t *tape,
-                struct ide_atapi_pc *pc,
-                unsigned int length, struct idetape_bh *bh)
+static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
+                struct ide_atapi_pc *pc, unsigned int length,
+                struct idetape_bh *bh, u8 opcode)
 {
         idetape_init_pc(pc);
-        pc->c[0] = READ_6;
         put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
         pc->c[1] = 1;
-        pc->idetape_callback = &idetape_rw_callback;
         pc->bh = bh;
-        atomic_set(&bh->b_count, 0);
         pc->buf = NULL;
         pc->buf_size = length * tape->blk_size;
         pc->req_xfer = pc->buf_size;
         if (pc->req_xfer == tape->buffer_size)
-                pc->flags |= PC_FLAG_DMA_RECOMMENDED;
-}
+                pc->flags |= PC_FLAG_DMA_OK;
 
-static void idetape_create_write_cmd(idetape_tape_t *tape,
-                struct ide_atapi_pc *pc,
-                unsigned int length, struct idetape_bh *bh)
-{
-        idetape_init_pc(pc);
-        pc->c[0] = WRITE_6;
-        put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
-        pc->c[1] = 1;
-        pc->idetape_callback = &idetape_rw_callback;
-        pc->flags |= PC_FLAG_WRITING;
-        pc->bh = bh;
-        pc->b_data = bh->b_data;
-        pc->b_count = atomic_read(&bh->b_count);
-        pc->buf = NULL;
-        pc->buf_size = length * tape->blk_size;
-        pc->req_xfer = pc->buf_size;
-        if (pc->req_xfer == tape->buffer_size)
-                pc->flags |= PC_FLAG_DMA_RECOMMENDED;
+        if (opcode == READ_6) {
+                pc->c[0] = READ_6;
+                atomic_set(&bh->b_count, 0);
+        } else if (opcode == WRITE_6) {
+                pc->c[0] = WRITE_6;
+                pc->flags |= PC_FLAG_WRITING;
+                pc->b_data = bh->b_data;
+                pc->b_count = atomic_read(&bh->b_count);
+        }
 }
 
 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
@@ -1211,8 +998,10 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
         }
 
         /* Retry a failed packet command */
-        if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE)
-                return idetape_issue_pc(drive, tape->failed_pc);
+        if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) {
+                pc = tape->failed_pc;
+                goto out;
+        }
 
         if (postponed_rq != NULL)
                 if (rq != postponed_rq) {
@@ -1262,14 +1051,16 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
         }
         if (rq->cmd[0] & REQ_IDETAPE_READ) {
                 pc = idetape_next_pc_storage(drive);
-                idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
-                                        (struct idetape_bh *)rq->special);
+                ide_tape_create_rw_cmd(tape, pc, rq->current_nr_sectors,
+                                        (struct idetape_bh *)rq->special,
+                                        READ_6);
                 goto out;
         }
         if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
                 pc = idetape_next_pc_storage(drive);
-                idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
-                                         (struct idetape_bh *)rq->special);
+                ide_tape_create_rw_cmd(tape, pc, rq->current_nr_sectors,
+                                         (struct idetape_bh *)rq->special,
+                                         WRITE_6);
                 goto out;
         }
         if (rq->cmd[0] & REQ_IDETAPE_PC1) {
@@ -1284,6 +1075,9 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
         }
         BUG();
 out:
+        if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags))
+                pc->flags |= PC_FLAG_DRQ_INTERRUPT;
+
         return idetape_issue_pc(drive, pc);
 }
 
@@ -1447,40 +1241,6 @@ static void idetape_init_merge_buffer(idetape_tape_t *tape)
         }
 }
 
-static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
-{
-        idetape_tape_t *tape = drive->driver_data;
-        u8 *readpos = tape->pc->buf;
-
-        debug_log(DBG_PROCS, "Enter %s\n", __func__);
-
-        if (!tape->pc->error) {
-                debug_log(DBG_SENSE, "BOP - %s\n",
-                                (readpos[0] & 0x80) ? "Yes" : "No");
-                debug_log(DBG_SENSE, "EOP - %s\n",
-                                (readpos[0] & 0x40) ? "Yes" : "No");
-
-                if (readpos[0] & 0x4) {
-                        printk(KERN_INFO "ide-tape: Block location is unknown"
-                                         "to the tape\n");
-                        clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
-                        idetape_end_request(drive, 0, 0);
-                } else {
-                        debug_log(DBG_SENSE, "Block Location - %u\n",
-                                        be32_to_cpu(*(u32 *)&readpos[4]));
-
-                        tape->partition = readpos[1];
-                        tape->first_frame =
-                                be32_to_cpu(*(u32 *)&readpos[4]);
-                        set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
-                        idetape_end_request(drive, 1, 0);
-                }
-        } else {
-                idetape_end_request(drive, 0, 0);
-        }
-        return ide_stopped;
-}
-
 /*
  * Write a filemark if write_filemark=1. Flush the device buffers without
  * writing a filemark otherwise.
@@ -1492,14 +1252,12 @@ static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
         pc->c[0] = WRITE_FILEMARKS;
         pc->c[4] = write_filemark;
         pc->flags |= PC_FLAG_WAIT_FOR_DSC;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
 {
         idetape_init_pc(pc);
         pc->c[0] = TEST_UNIT_READY;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 /*
@@ -1518,12 +1276,16 @@ static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
 static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
 {
         struct ide_tape_obj *tape = drive->driver_data;
-        struct request rq;
+        struct request *rq;
+        int error;
 
-        idetape_init_rq(&rq, REQ_IDETAPE_PC1);
-        rq.buffer = (char *) pc;
-        rq.rq_disk = tape->disk;
-        return ide_do_drive_cmd(drive, &rq, ide_wait);
+        rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+        rq->cmd_type = REQ_TYPE_SPECIAL;
+        rq->cmd[0] = REQ_IDETAPE_PC1;
+        rq->buffer = (char *)pc;
+        error = blk_execute_rq(drive->queue, tape->disk, rq, 0);
+        blk_put_request(rq);
+        return error;
 }
 
 static void idetape_create_load_unload_cmd(ide_drive_t *drive,
@@ -1533,7 +1295,6 @@ static void idetape_create_load_unload_cmd(ide_drive_t *drive,
         pc->c[0] = START_STOP;
         pc->c[4] = cmd;
         pc->flags |= PC_FLAG_WAIT_FOR_DSC;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
@@ -1585,7 +1346,6 @@ static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
         idetape_init_pc(pc);
         pc->c[0] = READ_POSITION;
         pc->req_xfer = 20;
-        pc->idetape_callback = &idetape_read_position_callback;
 }
 
 static int idetape_read_position(ide_drive_t *drive)
@@ -1613,7 +1373,6 @@ static void idetape_create_locate_cmd(ide_drive_t *drive,
         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
         pc->c[8] = partition;
         pc->flags |= PC_FLAG_WAIT_FOR_DSC;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 static int idetape_create_prevent_cmd(ide_drive_t *drive,
@@ -1628,7 +1387,6 @@ static int idetape_create_prevent_cmd(ide_drive_t *drive,
         idetape_init_pc(pc);
         pc->c[0] = ALLOW_MEDIUM_REMOVAL;
         pc->c[4] = prevent;
-        pc->idetape_callback = &idetape_pc_callback;
         return 1;
 }
 
@@ -1700,26 +1458,33 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
                                  struct idetape_bh *bh)
 {
         idetape_tape_t *tape = drive->driver_data;
-        struct request rq;
+        struct request *rq;
+        int ret, errors;
 
         debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
 
-        idetape_init_rq(&rq, cmd);
-        rq.rq_disk = tape->disk;
-        rq.special = (void *)bh;
-        rq.sector = tape->first_frame;
-        rq.nr_sectors           = blocks;
-        rq.current_nr_sectors   = blocks;
-        (void) ide_do_drive_cmd(drive, &rq, ide_wait);
+        rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+        rq->cmd_type = REQ_TYPE_SPECIAL;
+        rq->cmd[0] = cmd;
+        rq->rq_disk = tape->disk;
+        rq->special = (void *)bh;
+        rq->sector = tape->first_frame;
+        rq->nr_sectors = blocks;
+        rq->current_nr_sectors = blocks;
+        blk_execute_rq(drive->queue, tape->disk, rq, 0);
+
+        errors = rq->errors;
+        ret = tape->blk_size * (blocks - rq->current_nr_sectors);
+        blk_put_request(rq);
 
         if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
                 return 0;
 
         if (tape->merge_bh)
                 idetape_init_merge_buffer(tape);
-        if (rq.errors == IDETAPE_ERROR_GENERAL)
+        if (errors == IDETAPE_ERROR_GENERAL)
                 return -EIO;
-        return (tape->blk_size * (blocks-rq.current_nr_sectors));
+        return ret;
 }
 
 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
@@ -1728,7 +1493,6 @@ static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
         pc->c[0] = INQUIRY;
         pc->c[4] = 254;
         pc->req_xfer = 254;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 static void idetape_create_rewind_cmd(ide_drive_t *drive,
@@ -1737,7 +1501,6 @@ static void idetape_create_rewind_cmd(ide_drive_t *drive,
         idetape_init_pc(pc);
         pc->c[0] = REZERO_UNIT;
         pc->flags |= PC_FLAG_WAIT_FOR_DSC;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
@@ -1746,7 +1509,6 @@ static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
         pc->c[0] = ERASE;
         pc->c[1] = 1;
         pc->flags |= PC_FLAG_WAIT_FOR_DSC;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
@@ -1756,7 +1518,6 @@ static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
         put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
         pc->c[1] = cmd;
         pc->flags |= PC_FLAG_WAIT_FOR_DSC;
-        pc->idetape_callback = &idetape_pc_callback;
 }
 
 /* Queue up a character device originated write request. */
@@ -2751,9 +2512,8 @@ static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
          * Ensure that the number we got makes sense; limit it within
          * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
          */
-        tape->best_dsc_rw_freq = max_t(unsigned long,
-                                min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
-                                IDETAPE_DSC_RW_MIN);
+        tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
+                                         IDETAPE_DSC_RW_MAX);
         printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
                 "%lums tDSC%s\n",
                 drive->name, tape->name, *(u16 *)&tape->caps[14],
@@ -2905,11 +2665,6 @@ static int ide_tape_probe(ide_drive_t *drive)
                                 " the driver\n", drive->name);
                 goto failed;
         }
-        if (drive->scsi) {
-                printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi"
-                                 " emulation.\n", drive->name);
-                goto failed;
-        }
         tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
         if (tape == NULL) {
                 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",