FreeBSD/Linux Kernel Cross Reference
sys/dev/ata/atapi-tape.c

     /*-
      * Copyright (c) 1998 - 2004 Søren Schmidt <sos@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer,
     *    without modification, immediately at the beginning of the file.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_ata.h"
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/ata.h>
    #include <sys/kernel.h>
    #include <sys/conf.h>
    #include <sys/malloc.h>
    #include <sys/bio.h>
    #include <sys/bus.h>
    #include <sys/mtio.h>
    #include <sys/devicestat.h>
    #include <sys/sema.h>
    #include <sys/taskqueue.h>
    #include <vm/uma.h>
    #include <machine/bus.h>
    #include <dev/ata/ata-all.h>
    #include <dev/ata/atapi-tape.h>
    
    /* device structures */
    static  d_open_t        ast_open;
    static  d_close_t       ast_close;
    static  d_ioctl_t       ast_ioctl;
    static  d_strategy_t    ast_strategy;
    static struct cdevsw ast_cdevsw = {
            .d_version =    D_VERSION,
            .d_open =       ast_open,
            .d_close =      ast_close,
            .d_read =       physread,
            .d_write =      physwrite,
            .d_ioctl =      ast_ioctl,
            .d_strategy =   ast_strategy,
            .d_name =       "ast",
            .d_flags =      D_TAPE | D_TRACKCLOSE,
    };
    
    /* prototypes */
    static void ast_detach(struct ata_device *);
    static void ast_start(struct ata_device *);
    static int ast_sense(struct ast_softc *);
    static void ast_describe(struct ast_softc *);
    static void ast_done(struct ata_request *);
    static int ast_mode_sense(struct ast_softc *, int, void *, int); 
    static int ast_mode_select(struct ast_softc *, void *, int);
    static int ast_write_filemark(struct ast_softc *, u_int8_t);
    static int ast_read_position(struct ast_softc *, int, struct ast_readposition *);
    static int ast_space(struct ast_softc *, u_int8_t, int32_t);
    static int ast_locate(struct ast_softc *, int, u_int32_t);
    static int ast_prevent_allow(struct ast_softc *stp, int);
    static int ast_load_unload(struct ast_softc *, u_int8_t);
    static int ast_rewind(struct ast_softc *);
    static int ast_erase(struct ast_softc *);
    static int ast_test_ready(struct ata_device *);
    static int ast_wait_dsc(struct ata_device *, int);
    
    /* internal vars */
    static u_int32_t ast_lun_map = 0;
    static u_int64_t ast_total = 0;
    static MALLOC_DEFINE(M_AST, "AST driver", "ATAPI tape driver buffers");
    
    void 
    ast_attach(struct ata_device *atadev)
    {
        struct ast_softc *stp;
        struct ast_readposition position;
        struct cdev *dev;
    
        stp = malloc(sizeof(struct ast_softc), M_AST, M_NOWAIT | M_ZERO);
        if (!stp) {
           ata_prtdev(atadev, "out of memory\n");
           return;
       }
   
       stp->device = atadev;
       stp->lun = ata_get_lun(&ast_lun_map);
       ata_set_name(atadev, "ast", stp->lun);
       bioq_init(&stp->queue);
       mtx_init(&stp->queue_mtx, "ATAPI TAPE bioqueue lock", NULL, MTX_DEF);
   
       if (ast_sense(stp)) {
           free(stp, M_AST);
           return;
       }
   
       if (!strcmp(atadev->param->model, "OnStream DI-30")) {
           struct ast_transferpage transfer;
           struct ast_identifypage identify;
   
           stp->flags |= F_ONSTREAM;
           bzero(&transfer, sizeof(struct ast_transferpage));
           ast_mode_sense(stp, ATAPI_TAPE_TRANSFER_PAGE,
                          &transfer, sizeof(transfer));
           bzero(&identify, sizeof(struct ast_identifypage));
           ast_mode_sense(stp, ATAPI_TAPE_IDENTIFY_PAGE,
                          &identify, sizeof(identify));
           strncpy(identify.ident, "FBSD", 4);
           ast_mode_select(stp, &identify, sizeof(identify));
           ast_read_position(stp, 0, &position);
       }
   
       stp->stats = devstat_new_entry("ast", stp->lun, DEV_BSIZE,
                         DEVSTAT_NO_ORDERED_TAGS,
                         DEVSTAT_TYPE_SEQUENTIAL | DEVSTAT_TYPE_IF_IDE,
                         DEVSTAT_PRIORITY_TAPE);
       dev = make_dev(&ast_cdevsw, 2 * stp->lun,
                      UID_ROOT, GID_OPERATOR, 0640, "ast%d", stp->lun);
       dev->si_drv1 = stp;
       if (atadev->channel->dma)
           dev->si_iosize_max = atadev->channel->dma->max_iosize;
       else
           dev->si_iosize_max = DFLTPHYS;
       stp->dev1 = dev;
       dev = make_dev(&ast_cdevsw, 2 * stp->lun + 1,
                      UID_ROOT, GID_OPERATOR, 0640, "nast%d", stp->lun);
   
       dev->si_drv1 = stp;
       if (atadev->channel->dma)
           dev->si_iosize_max = atadev->channel->dma->max_iosize;
       else
           dev->si_iosize_max = DFLTPHYS;
       stp->dev2 = dev;
   
       /* setup the function ptrs */ 
       atadev->detach = ast_detach;
       atadev->start = ast_start;
       atadev->softc = stp;
       atadev->flags |= ATA_D_MEDIA_CHANGED;
   
       /* announce we are here */
       ast_describe(stp);
   }
   
   static void     
   ast_detach(struct ata_device *atadev)
   {   
       struct ast_softc *stp = atadev->softc;
       
       mtx_lock(&stp->queue_mtx);
       bioq_flush(&stp->queue, NULL, ENXIO);
       mtx_unlock(&stp->queue_mtx);
       mtx_destroy(&stp->queue_mtx);
       destroy_dev(stp->dev1);
       destroy_dev(stp->dev2);
       devstat_remove_entry(stp->stats);
       ata_prtdev(atadev, "WARNING - removed from configuration\n");
       ata_free_name(atadev);
       ata_free_lun(&ast_lun_map, stp->lun);
       atadev->attach = NULL;
       atadev->detach = NULL;
       atadev->start = NULL;
       atadev->softc = NULL;
       atadev->flags = 0;
       free(stp, M_AST);
   }
   
   static int
   ast_sense(struct ast_softc *stp)
   {
       int count;
   
       /* get drive capabilities, some bugridden drives needs this repeated */
       for (count = 0 ; count < 5 ; count++) {
           if (!ast_mode_sense(stp, ATAPI_TAPE_CAP_PAGE,
                               &stp->cap, sizeof(stp->cap)) &&
               stp->cap.page_code == ATAPI_TAPE_CAP_PAGE) {
               if (stp->cap.blk32k)
                   stp->blksize = 32768;
               if (stp->cap.blk1024)
                   stp->blksize = 1024;
               if (stp->cap.blk512)
                   stp->blksize = 512;
               if (!stp->blksize)
                   continue;
               stp->cap.max_speed = ntohs(stp->cap.max_speed);
               stp->cap.max_defects = ntohs(stp->cap.max_defects);
               stp->cap.ctl = ntohs(stp->cap.ctl);
               stp->cap.speed = ntohs(stp->cap.speed);
               stp->cap.buffer_size = ntohs(stp->cap.buffer_size);
               return 0;
           }
       }
       return 1;
   }
   
   static void 
   ast_describe(struct ast_softc *stp)
   {
       if (bootverbose) {
           ata_prtdev(stp->device, "<%.40s/%.8s> tape drive at ata%d as %s\n",
                      stp->device->param->model, stp->device->param->revision,
                      device_get_unit(stp->device->channel->dev),
                      (stp->device->unit == ATA_MASTER) ? "master" : "slave");
           ata_prtdev(stp->device, "%dKB/s, ", stp->cap.max_speed);
           printf("transfer limit %d blk%s, ",
                  stp->cap.ctl, (stp->cap.ctl > 1) ? "s" : "");
           printf("%dKB buffer, ", (stp->cap.buffer_size * DEV_BSIZE) / 1024);
           printf("%s\n", ata_mode2str(stp->device->mode));
           ata_prtdev(stp->device, "Medium: ");
           switch (stp->cap.medium_type) {
               case 0x00:
                   printf("none"); break;
               case 0x17:
                   printf("Travan 1 (400 Mbyte)"); break;
               case 0xb6:
                   printf("Travan 4 (4 Gbyte)"); break;
               case 0xda:
                   printf("OnStream ADR (15Gyte)"); break;
               default:
                   printf("unknown (0x%x)", stp->cap.medium_type);
           }
           if (stp->cap.readonly) printf(", readonly");
           if (stp->cap.reverse) printf(", reverse");
           if (stp->cap.eformat) printf(", eformat");
           if (stp->cap.qfa) printf(", qfa");
           if (stp->cap.lock) printf(", lock");
           if (stp->cap.locked) printf(", locked");
           if (stp->cap.prevent) printf(", prevent");
           if (stp->cap.eject) printf(", eject");
           if (stp->cap.disconnect) printf(", disconnect");
           if (stp->cap.ecc) printf(", ecc");
           if (stp->cap.compress) printf(", compress");
           if (stp->cap.blk512) printf(", 512b");
           if (stp->cap.blk1024) printf(", 1024b");
           if (stp->cap.blk32k) printf(", 32kb");
           printf("\n");
       }
       else {
           ata_prtdev(stp->device, "TAPE <%.40s/%.8s> at ata%d-%s %s\n",
                      stp->device->param->model, stp->device->param->revision,
                      device_get_unit(stp->device->channel->dev),
                      (stp->device->unit == ATA_MASTER) ? "master" : "slave",
                      ata_mode2str(stp->device->mode));
       }
   }
   
   static int
   ast_open(struct cdev *dev, int flags, int fmt, struct thread *td)
   {
       struct ast_softc *stp = dev->si_drv1;
   
       if (!stp || stp->device->flags & ATA_D_DETACHING)
           return ENXIO;
   
       if (count_dev(dev) > 1)
           return EBUSY;
   
       ast_test_ready(stp->device);
   
       if (stp->cap.lock)
           ast_prevent_allow(stp, 1);
   
       if (ast_sense(stp))
           ata_prtdev(stp->device, "sense media type failed\n");
   
       stp->device->flags &= ~ATA_D_MEDIA_CHANGED;
       stp->flags &= ~(F_DATA_WRITTEN | F_FM_WRITTEN);
       ast_total = 0;
       return 0;
   }
   
   static int 
   ast_close(struct cdev *dev, int flags, int fmt, struct thread *td)
   {
       struct ast_softc *stp = dev->si_drv1;
   
       /* flush buffers, some drives fail here, they should report ctl = 0 */
       if (stp->cap.ctl && (stp->flags & F_DATA_WRITTEN))
           ast_write_filemark(stp, 0);
   
       /* write filemark if data written to tape */
       if (!(stp->flags & F_ONSTREAM) &&
           (stp->flags & (F_DATA_WRITTEN | F_FM_WRITTEN)) == F_DATA_WRITTEN)
           ast_write_filemark(stp, ATAPI_WF_WRITE);
   
       /* if minor is even rewind on close */
       if (!(minor(dev) & 0x01))
           ast_rewind(stp);
   
       if (stp->cap.lock && count_dev(dev) == 1)
           ast_prevent_allow(stp, 0);
   
       stp->flags &= ~F_CTL_WARN;
   #ifdef AST_DEBUG
       ata_prtdev(stp->device, "%ju total bytes transferred\n",
                  (uintmax_t)ast_total);
   #endif
       return 0;
   }
   
   static int 
   ast_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
   {
       struct ast_softc *stp = dev->si_drv1;
       int error = 0;
   
       switch (cmd) {
       case MTIOCGET:
           {
               struct mtget *g = (struct mtget *) addr;
   
               bzero(g, sizeof(struct mtget));
               g->mt_type = 7;
               g->mt_density = 1;
               g->mt_blksiz = stp->blksize;
               g->mt_comp = stp->cap.compress;
               g->mt_density0 = 0; g->mt_density1 = 0;
               g->mt_density2 = 0; g->mt_density3 = 0;
               g->mt_blksiz0 = 0; g->mt_blksiz1 = 0;
               g->mt_blksiz2 = 0; g->mt_blksiz3 = 0;
               g->mt_comp0 = 0; g->mt_comp1 = 0;
               g->mt_comp2 = 0; g->mt_comp3 = 0;
           }
           break;   
   
       case MTIOCTOP:
           {       
               int i;
               struct mtop *mt = (struct mtop *)addr;
   
               switch ((int16_t) (mt->mt_op)) {
   
               case MTWEOF:
                   for (i=0; i < mt->mt_count && !error; i++)
                       error = ast_write_filemark(stp, ATAPI_WF_WRITE);
                   break;
   
               case MTFSF:
                   if (mt->mt_count)
                       error = ast_space(stp, ATAPI_SP_FM, mt->mt_count);
                   break;
   
               case MTBSF:
                   if (mt->mt_count)
                       error = ast_space(stp, ATAPI_SP_FM, -(mt->mt_count));
                   break;
   
               case MTREW:
                   error = ast_rewind(stp);
                   break;
   
               case MTOFFL:
                   error = ast_load_unload(stp, ATAPI_SS_EJECT);
                   break;
   
               case MTNOP:
                   error = ast_write_filemark(stp, 0);
                   break;
   
               case MTERASE:
                   error = ast_erase(stp);
                   break;
   
               case MTEOD:
                   error = ast_space(stp, ATAPI_SP_EOD, 0);
                   break;
   
               case MTRETENS:
                   error = ast_load_unload(stp, ATAPI_SS_RETENSION|ATAPI_SS_LOAD);
                   break;
   
               case MTFSR:         
               case MTBSR:
               case MTCACHE:
               case MTNOCACHE:
               case MTSETBSIZ:
               case MTSETDNSTY:
               case MTCOMP:
               default:
                   error = EINVAL;
               }
           }
           break;
   
       case MTIOCRDSPOS:
           {
               struct ast_readposition position;
   
               if ((error = ast_read_position(stp, 0, &position)))
                   break;
               *(u_int32_t *)addr = position.tape;
           }
           break;
   
       case MTIOCRDHPOS:
           {
               struct ast_readposition position;
   
               if ((error = ast_read_position(stp, 1, &position)))
                   break;
               *(u_int32_t *)addr = position.tape;
           }
           break;
   
       case MTIOCSLOCATE:
           error = ast_locate(stp, 0, *(u_int32_t *)addr);
           break;
   
       case MTIOCHLOCATE:
           error = ast_locate(stp, 1, *(u_int32_t *)addr);
           break;
   
       default:
           error = ENOTTY;
       }
       return error;
   }
   
   static void 
   ast_strategy(struct bio *bp)
   {
       struct ast_softc *stp = bp->bio_dev->si_drv1;
   
       if (stp->device->flags & ATA_D_DETACHING) {
           biofinish(bp, NULL, ENXIO);
           return;
       }
   
       /* if it's a null transfer, return immediatly. */
       if (bp->bio_bcount == 0) {
           bp->bio_resid = 0;
           biodone(bp);
           return;
       }
       if (!(bp->bio_cmd == BIO_READ) && stp->flags & F_WRITEPROTECT) {
           biofinish(bp, NULL, EPERM);
           return;
       }
           
       /* check for != blocksize requests */
       if (bp->bio_bcount % stp->blksize) {
           ata_prtdev(stp->device, "transfers must be multiple of %d\n",
                      stp->blksize);
           biofinish(bp, NULL, EIO);
           return;
       }
   
       /* warn about transfers bigger than the device suggests */
       if (bp->bio_bcount > stp->blksize * stp->cap.ctl) {  
           if ((stp->flags & F_CTL_WARN) == 0) {
               ata_prtdev(stp->device, "WARNING: CTL exceeded %ld>%d\n",
                          bp->bio_bcount, stp->blksize * stp->cap.ctl);
               stp->flags |= F_CTL_WARN;
           }
       }
   
       mtx_lock(&stp->queue_mtx);
       bioq_insert_tail(&stp->queue, bp);
       mtx_unlock(&stp->queue_mtx);
       ata_start(stp->device->channel);
   }
   
   static void 
   ast_start(struct ata_device *atadev)
   {
       struct ast_softc *stp = atadev->softc;
       struct bio *bp;
       struct ata_request *request;
       u_int32_t blkcount;
       int8_t ccb[16];
       
       mtx_lock(&stp->queue_mtx);
       bp = bioq_first(&stp->queue);
       if (!bp) {
           mtx_unlock(&stp->queue_mtx);
           return;
       }
       bioq_remove(&stp->queue, bp);
       mtx_unlock(&stp->queue_mtx);
   
       bzero(ccb, sizeof(ccb));
   
       if (bp->bio_cmd == BIO_READ)
           ccb[0] = ATAPI_READ;
       else
           ccb[0] = ATAPI_WRITE;
       
       blkcount = bp->bio_bcount / stp->blksize;
   
       ccb[1] = 1;
       ccb[2] = blkcount>>16;
       ccb[3] = blkcount>>8;
       ccb[4] = blkcount;
   
       if (!(request = ata_alloc_request())) {
           biofinish(bp, NULL, ENOMEM);
           return;
       }
       request->device = atadev;
       request->driver = bp;
       bcopy(ccb, request->u.atapi.ccb,
             (request->device->param->config & ATA_PROTO_MASK) == 
             ATA_PROTO_ATAPI_12 ? 16 : 12);
       request->data = bp->bio_data;
       request->bytecount = blkcount * stp->blksize;
       request->transfersize = min(request->bytecount, 65534);
       request->timeout = (ccb[0] == ATAPI_WRITE_BIG) ? 180 : 120;
       request->retries = 2;
       request->callback = ast_done;
       switch (bp->bio_cmd) {
       case BIO_READ:
           request->flags |= (ATA_R_ATAPI | ATA_R_READ);
           break;
       case BIO_WRITE:
           request->flags |= (ATA_R_ATAPI | ATA_R_WRITE);
           break;
       default:
           ata_prtdev(atadev, "unknown BIO operation\n");
           ata_free_request(request);
           biofinish(bp, NULL, EIO);
           return;
       }
       devstat_start_transaction_bio(stp->stats, bp);
       ata_queue_request(request);
   }
   
   static void 
   ast_done(struct ata_request *request)
   {
       struct bio *bp = request->driver;
       struct ast_softc *stp = request->device->softc;
   
       /* finish up transfer */
       if ((bp->bio_error = request->result))
           bp->bio_flags |= BIO_ERROR;
       if (bp->bio_cmd == BIO_WRITE)
           stp->flags |= F_DATA_WRITTEN;
       bp->bio_resid = bp->bio_bcount - request->donecount;
       ast_total += (bp->bio_bcount - bp->bio_resid);
       biofinish(bp, stp->stats, 0);
       ata_free_request(request);
   }
   
   static int
   ast_mode_sense(struct ast_softc *stp, int page, void *pagebuf, int pagesize)
   {
       int8_t ccb[16] = { ATAPI_MODE_SENSE, 0x08, page, pagesize>>8, pagesize,
                          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
       int error;
    
       error = ata_atapicmd(stp->device, ccb, pagebuf, pagesize, ATA_R_READ, 10);
   #ifdef AST_DEBUG
       atapi_dump("ast: mode sense ", pagebuf, pagesize);
   #endif
       return error;
   }
   
   static int       
   ast_mode_select(struct ast_softc *stp, void *pagebuf, int pagesize)
   {
       int8_t ccb[16] = { ATAPI_MODE_SELECT, 0x10, 0, pagesize>>8, pagesize,
                          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        
   #ifdef AST_DEBUG
       ata_prtdev(stp->device, "modeselect pagesize=%d\n", pagesize);
       atapi_dump("mode select ", pagebuf, pagesize);
   #endif
       return ata_atapicmd(stp->device, ccb, pagebuf, pagesize, 0, 10);
   }
   
   static int
   ast_write_filemark(struct ast_softc *stp, u_int8_t function)
   {
       int8_t ccb[16] = { ATAPI_WEOF, 0x01, 0, 0, function, 0, 0, 0,
                          0, 0, 0, 0, 0, 0, 0, 0 };
       int error;
   
       if (stp->flags & F_ONSTREAM)
           ccb[4] = 0x00;          /* only flush buffers supported */
       else {
           if (function) {
               if (stp->flags & F_FM_WRITTEN)
                   stp->flags &= ~F_DATA_WRITTEN;
               else
                   stp->flags |= F_FM_WRITTEN;
           }
       }
       error = ata_atapicmd(stp->device, ccb, NULL, 0, 0, 10);
       if (error)
           return error;
       return ast_wait_dsc(stp->device, 10*60);
   }
   
   static int
   ast_read_position(struct ast_softc *stp, int hard,
                     struct ast_readposition *position)
   {
       int8_t ccb[16] = { ATAPI_READ_POSITION, (hard ? 0x01 : 0), 0, 0, 0, 0, 0, 0,
                          0, 0, 0, 0, 0, 0, 0, 0 };
       int error;
   
       error = ata_atapicmd(stp->device, ccb, (caddr_t)position, 
                            sizeof(struct ast_readposition), ATA_R_READ, 10);
       position->tape = ntohl(position->tape);
       position->host = ntohl(position->host);
       return error;
   }
   
   static int
   ast_space(struct ast_softc *stp, u_int8_t function, int32_t count)
   {
       int8_t ccb[16] = { ATAPI_SPACE, function, count>>16, count>>8, count,
                          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
   
       return ata_atapicmd(stp->device, ccb, NULL, 0, 0, 60*60);
   }
   
   static int
   ast_locate(struct ast_softc *stp, int hard, u_int32_t pos)
   {
       int8_t ccb[16] = { ATAPI_LOCATE, 0x01 | (hard ? 0x4 : 0), 0,
                          pos>>24, pos>>16, pos>>8, pos,
                          0, 0, 0, 0, 0, 0, 0, 0, 0 };
       int error;
   
       error = ata_atapicmd(stp->device, ccb, NULL, 0, 0, 10);
       if (error)
           return error;
       return ast_wait_dsc(stp->device, 60*60);
   }
   
   static int
   ast_prevent_allow(struct ast_softc *stp, int lock)
   {
       int8_t ccb[16] = { ATAPI_PREVENT_ALLOW, 0, 0, 0, lock,
                          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
   
       return ata_atapicmd(stp->device, ccb, NULL, 0, 0, 30);
   }
   
   static int
   ast_load_unload(struct ast_softc *stp, u_int8_t function)
   {
       int8_t ccb[16] = { ATAPI_START_STOP, 0x01, 0, 0, function, 0, 0, 0,
                          0, 0, 0, 0, 0, 0, 0, 0 };
       int error;
   
       if ((function & ATAPI_SS_EJECT) && !stp->cap.eject)
           return 0;
       error = ata_atapicmd(stp->device, ccb, NULL, 0, 0, 10);
       if (error)
           return error;
       tsleep((caddr_t)&error, PRIBIO, "astlu", 1 * hz);
       if (function == ATAPI_SS_EJECT)
           return 0;
       return ast_wait_dsc(stp->device, 60*60);
   }
   
   static int
   ast_rewind(struct ast_softc *stp)
   {
       int8_t ccb[16] = { ATAPI_REZERO, 0x01, 0, 0, 0, 0, 0, 0,
                          0, 0, 0, 0, 0, 0, 0, 0 };
       int error;
   
       error = ata_atapicmd(stp->device, ccb, NULL, 0, 0, 10);
       if (error)
           return error;
       return ast_wait_dsc(stp->device, 60*60);
   }
   
   static int
   ast_erase(struct ast_softc *stp)
   {
       int8_t ccb[16] = { ATAPI_ERASE, 3, 0, 0, 0, 0, 0, 0,
                          0, 0, 0, 0, 0, 0, 0, 0 };
       int error;
   
       if ((error = ast_rewind(stp)))
           return error;
   
       return ata_atapicmd(stp->device, ccb, NULL, 0, 0, 60*60);
   }
   
   static int
   ast_test_ready(struct ata_device *atadev)
   {
       int8_t ccb[16] = { ATAPI_TEST_UNIT_READY, 0, 0, 0, 0,
                          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
   
       return ata_atapicmd(atadev, ccb, NULL, 0, 0, 30);
   }
   
   static int
   ast_wait_dsc(struct ata_device *atadev, int timeout)
   {
       int error = 0;
       int8_t ccb[16] = { ATAPI_POLL_DSC, 0, 0, 0, 0,
                          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
   
       timeout *= hz;
       while (timeout > 0) {
           error = ata_atapicmd(atadev, ccb, NULL, 0, 0, 0);
           if (error != EBUSY)
               break;
           tsleep(&error, PRIBIO, "atpwt", hz / 2);
           timeout -= (hz / 2);
       }
       return error;
   }

Cache object: 4a7022ffc917dee175f83242dc70b056