/* * sr.c Copyright (C) 1992 David Giller * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale * * adapted from: * sd.c Copyright (C) 1992 Drew Eckhardt * Linux scsi disk driver by * Drew Eckhardt * * Modified by Eric Youngdale ericy@andante.org to * add scatter-gather, multiple outstanding request, and other * enhancements. * * Modified by Eric Youngdale eric@andante.org to support loadable * low-level scsi drivers. * * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to * provide auto-eject. * * Modified by Gerd Knorr to support the * generic cdrom interface * * Modified by Jens Axboe - Uniform sr_packet() * interface, capabilities probe additions, ioctl cleanups, etc. * * Modified by Richard Gooch to support devfs * * Modified by Jens Axboe - support DVD-RAM * transparently and loose the GHOST hack * * Modified by Arnaldo Carvalho de Melo * check resource allocation in sr_init and some cleanups * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAJOR_NR SCSI_CDROM_MAJOR #include #include "scsi.h" #include "hosts.h" #include "sr.h" #include /* For the door lock/unlock commands */ #include "constants.h" #ifdef MODULE MODULE_PARM(xa_test, "i"); /* see sr_ioctl.c */ #endif #define MAX_RETRIES 3 #define SR_TIMEOUT (30 * HZ) static int sr_init(void); static void sr_finish(void); static int sr_attach(Scsi_Device *); static int sr_detect(Scsi_Device *); static void sr_detach(Scsi_Device *); static int sr_init_command(Scsi_Cmnd *); static struct Scsi_Device_Template sr_template = { name:"cdrom", tag:"sr", scsi_type:TYPE_ROM, major:SCSI_CDROM_MAJOR, blk:1, detect:sr_detect, init:sr_init, finish:sr_finish, attach:sr_attach, detach:sr_detach, init_command:sr_init_command }; Scsi_CD *scsi_CDs; static int *sr_sizes; static int *sr_blocksizes; static int *sr_hardsizes; static int sr_open(struct cdrom_device_info *, int); void get_sectorsize(int); void get_capabilities(int); static int sr_media_change(struct cdrom_device_info *, int); static int sr_packet(struct cdrom_device_info *, struct cdrom_generic_command *); static void sr_release(struct cdrom_device_info *cdi) { if (scsi_CDs[MINOR(cdi->dev)].device->sector_size > 2048) sr_set_blocklength(MINOR(cdi->dev), 2048); sync_dev(cdi->dev); scsi_CDs[MINOR(cdi->dev)].device->access_count--; if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module); if (sr_template.module) __MOD_DEC_USE_COUNT(sr_template.module); } static struct cdrom_device_ops sr_dops = { open: sr_open, release: sr_release, drive_status: sr_drive_status, media_changed: sr_media_change, tray_move: sr_tray_move, lock_door: sr_lock_door, select_speed: sr_select_speed, get_last_session: sr_get_last_session, get_mcn: sr_get_mcn, reset: sr_reset, audio_ioctl: sr_audio_ioctl, dev_ioctl: sr_dev_ioctl, capability: CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_IOCTLS | CDC_DRIVE_STATUS | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET, generic_packet: sr_packet, }; /* * This function checks to see if the media has been changed in the * CDROM drive. It is possible that we have already sensed a change, * or the drive may have sensed one and not yet reported it. We must * be ready for either case. This function always reports the current * value of the changed bit. If flag is 0, then the changed bit is reset. * This function could be done as an ioctl, but we would need to have * an inode for that to work, and we do not always have one. */ int sr_media_change(struct cdrom_device_info *cdi, int slot) { int retval; if (CDSL_CURRENT != slot) { /* no changer support */ return -EINVAL; } retval = scsi_ioctl(scsi_CDs[MINOR(cdi->dev)].device, SCSI_IOCTL_TEST_UNIT_READY, 0); if (retval) { /* Unable to test, unit probably not ready. This usually * means there is no disc in the drive. Mark as changed, * and we will figure it out later once the drive is * available again. */ scsi_CDs[MINOR(cdi->dev)].device->changed = 1; return 1; /* This will force a flush, if called from * check_disk_change */ }; retval = scsi_CDs[MINOR(cdi->dev)].device->changed; scsi_CDs[MINOR(cdi->dev)].device->changed = 0; /* If the disk changed, the capacity will now be different, * so we force a re-read of this information */ if (retval) { /* check multisession offset etc */ sr_cd_check(cdi); /* * If the disk changed, the capacity will now be different, * so we force a re-read of this information * Force 2048 for the sector size so that filesystems won't * be trying to use something that is too small if the disc * has changed. */ scsi_CDs[MINOR(cdi->dev)].needs_sector_size = 1; scsi_CDs[MINOR(cdi->dev)].device->sector_size = 2048; } return retval; } /* * rw_intr is the interrupt routine for the device driver. It will be notified on the * end of a SCSI read / write, and will take on of several actions based on success or failure. */ static void rw_intr(Scsi_Cmnd * SCpnt) { int result = SCpnt->result; int this_count = SCpnt->bufflen >> 9; int good_sectors = (result == 0 ? this_count : 0); int block_sectors = 0; #ifdef DEBUG printk("sr.c done: %x %x\n", result, SCpnt->request.bh->b_data); #endif /* Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial success. Since this is a relatively rare error condition, no care is taken to avoid unnecessary additional work such as memcpy's that could be avoided. */ if (driver_byte(result) != 0 && /* An error occurred */ SCpnt->sense_buffer[0] == 0xF0 && /* Sense data is valid */ (SCpnt->sense_buffer[2] == MEDIUM_ERROR || SCpnt->sense_buffer[2] == VOLUME_OVERFLOW || SCpnt->sense_buffer[2] == ILLEGAL_REQUEST)) { long error_sector = (SCpnt->sense_buffer[3] << 24) | (SCpnt->sense_buffer[4] << 16) | (SCpnt->sense_buffer[5] << 8) | SCpnt->sense_buffer[6]; int device_nr = DEVICE_NR(SCpnt->request.rq_dev); if (SCpnt->request.bh != NULL) block_sectors = SCpnt->request.bh->b_size >> 9; if (block_sectors < 4) block_sectors = 4; if (scsi_CDs[device_nr].device->sector_size == 2048) error_sector <<= 2; error_sector &= ~(block_sectors - 1); good_sectors = error_sector - SCpnt->request.sector; if (good_sectors < 0 || good_sectors >= this_count) good_sectors = 0; /* * The SCSI specification allows for the value returned by READ * CAPACITY to be up to 75 2K sectors past the last readable * block. Therefore, if we hit a medium error within the last * 75 2K sectors, we decrease the saved size value. */ if ((error_sector >> 1) < sr_sizes[device_nr] && scsi_CDs[device_nr].capacity - error_sector < 4 * 75) sr_sizes[device_nr] = error_sector >> 1; } /* * This calls the generic completion function, now that we know * how many actual sectors finished, and how many sectors we need * to say have failed. */ scsi_io_completion(SCpnt, good_sectors, block_sectors); } static request_queue_t *sr_find_queue(kdev_t dev) { /* * No such device */ if (MINOR(dev) >= sr_template.dev_max || !scsi_CDs[MINOR(dev)].device) return NULL; return &scsi_CDs[MINOR(dev)].device->request_queue; } static int sr_init_command(Scsi_Cmnd * SCpnt) { int dev, devm, block, this_count; devm = MINOR(SCpnt->request.rq_dev); dev = DEVICE_NR(SCpnt->request.rq_dev); block = SCpnt->request.sector; this_count = SCpnt->request_bufflen >> 9; if (!SCpnt->request.bh) { /* * Umm, yeah, right. Swapping to a cdrom. Nice try. */ return 0; } SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %d, block = %d\n", devm, block)); if (dev >= sr_template.nr_dev || !scsi_CDs[dev].device || !scsi_CDs[dev].device->online) { SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", SCpnt->request.nr_sectors)); SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); return 0; } if (scsi_CDs[dev].device->changed) { /* * quietly refuse to do anything to a changed disc until the changed * bit has been reset */ /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ return 0; } /* * we do lazy blocksize switching (when reading XA sectors, * see CDROMREADMODE2 ioctl) */ if (scsi_CDs[dev].device->sector_size > 2048) { if (!in_interrupt()) sr_set_blocklength(DEVICE_NR(CURRENT->rq_dev), 2048); else printk("sr: can't switch blocksize: in interrupt\n"); } if ((SCpnt->request.cmd == WRITE) && !scsi_CDs[dev].device->writeable) return 0; if (scsi_CDs[dev].device->sector_size == 1024) { if ((block & 1) || (SCpnt->request.nr_sectors & 1)) { printk("sr.c:Bad 1K block number requested (%d %ld)", block, SCpnt->request.nr_sectors); return 0; } else { block = block >> 1; this_count = this_count >> 1; } } if (scsi_CDs[dev].device->sector_size == 2048) { if ((block & 3) || (SCpnt->request.nr_sectors & 3)) { printk("sr.c:Bad 2K block number requested (%d %ld)", block, SCpnt->request.nr_sectors); return 0; } else { block = block >> 2; this_count = this_count >> 2; } } switch (SCpnt->request.cmd) { case WRITE: SCpnt->cmnd[0] = WRITE_10; SCpnt->sc_data_direction = SCSI_DATA_WRITE; break; case READ: SCpnt->cmnd[0] = READ_10; SCpnt->sc_data_direction = SCSI_DATA_READ; break; default: panic("Unknown sr command %d\n", SCpnt->request.cmd); } SCSI_LOG_HLQUEUE(2, printk("sr%d : %s %d/%ld 512 byte blocks.\n", devm, (SCpnt->request.cmd == WRITE) ? "writing" : "reading", this_count, SCpnt->request.nr_sectors)); SCpnt->cmnd[1] = (SCpnt->lun << 5) & 0xe0; if (this_count > 0xffff) this_count = 0xffff; SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; SCpnt->cmnd[5] = (unsigned char) block & 0xff; SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; /* * We shouldn't disconnect in the middle of a sector, so with a dumb * host adapter, it's safe to assume that we can at least transfer * this many bytes between each connect / disconnect. */ SCpnt->transfersize = scsi_CDs[dev].device->sector_size; SCpnt->underflow = this_count << 9; SCpnt->allowed = MAX_RETRIES; SCpnt->timeout_per_command = SR_TIMEOUT; /* * This is the completion routine we use. This is matched in terms * of capability to this function. */ SCpnt->done = rw_intr; /* * This indicates that the command is ready from our end to be * queued. */ return 1; } static int sr_open(struct cdrom_device_info *cdi, int purpose) { check_disk_change(cdi->dev); if (MINOR(cdi->dev) >= sr_template.dev_max || !scsi_CDs[MINOR(cdi->dev)].device) { return -ENXIO; /* No such device */ } /* * If the device is in error recovery, wait until it is done. * If the device is offline, then disallow any access to it. */ if (!scsi_block_when_processing_errors(scsi_CDs[MINOR(cdi->dev)].device)) { return -ENXIO; } scsi_CDs[MINOR(cdi->dev)].device->access_count++; if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module) __MOD_INC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module); if (sr_template.module) __MOD_INC_USE_COUNT(sr_template.module); /* If this device did not have media in the drive at boot time, then * we would have been unable to get the sector size. Check to see if * this is the case, and try again. */ if (scsi_CDs[MINOR(cdi->dev)].needs_sector_size) get_sectorsize(MINOR(cdi->dev)); return 0; } /* * do_sr_request() is the request handler function for the sr driver. * Its function in life is to take block device requests, and * translate them to SCSI commands. */ static int sr_detect(Scsi_Device * SDp) { if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM) return 0; printk("Detected scsi CD-ROM sr%d at scsi%d, channel %d, id %d, lun %d\n", sr_template.dev_noticed++, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun); return 1; } static int sr_attach(Scsi_Device * SDp) { Scsi_CD *cpnt; int i; if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM) return 1; if (sr_template.nr_dev >= sr_template.dev_max) { SDp->attached--; return 1; } for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++) if (!cpnt->device) break; if (i >= sr_template.dev_max) panic("scsi_devices corrupt (sr)"); scsi_CDs[i].device = SDp; sr_template.nr_dev++; if (sr_template.nr_dev > sr_template.dev_max) panic("scsi_devices corrupt (sr)"); return 0; } void get_sectorsize(int i) { unsigned char cmd[10]; unsigned char *buffer; int the_result, retries; int sector_size; Scsi_Request *SRpnt; buffer = (unsigned char *) scsi_malloc(512); SRpnt = scsi_allocate_request(scsi_CDs[i].device); retries = 3; do { cmd[0] = READ_CAPACITY; cmd[1] = (scsi_CDs[i].device->lun << 5) & 0xe0; memset((void *) &cmd[2], 0, 8); SRpnt->sr_request.rq_status = RQ_SCSI_BUSY; /* Mark as really busy */ SRpnt->sr_cmd_len = 0; memset(buffer, 0, 8); /* Do the command and wait.. */ SRpnt->sr_data_direction = SCSI_DATA_READ; scsi_wait_req(SRpnt, (void *) cmd, (void *) buffer, 8, SR_TIMEOUT, MAX_RETRIES); the_result = SRpnt->sr_result; retries--; } while (the_result && retries); scsi_release_request(SRpnt); SRpnt = NULL; if (the_result) { scsi_CDs[i].capacity = 0x1fffff; sector_size = 2048; /* A guess, just in case */ scsi_CDs[i].needs_sector_size = 1; } else { #if 0 if (cdrom_get_last_written(MKDEV(MAJOR_NR, i), (long *) &scsi_CDs[i].capacity)) #endif scsi_CDs[i].capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]); sector_size = (buffer[4] << 24) | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; switch (sector_size) { /* * HP 4020i CD-Recorder reports 2340 byte sectors * Philips CD-Writers report 2352 byte sectors * * Use 2k sectors for them.. */ case 0: case 2340: case 2352: sector_size = 2048; /* fall through */ case 2048: scsi_CDs[i].capacity *= 4; /* fall through */ case 512: break; default: printk("sr%d: unsupported sector size %d.\n", i, sector_size); scsi_CDs[i].capacity = 0; scsi_CDs[i].needs_sector_size = 1; } scsi_CDs[i].device->sector_size = sector_size; /* * Add this so that we have the ability to correctly gauge * what the device is capable of. */ scsi_CDs[i].needs_sector_size = 0; sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9); }; scsi_free(buffer, 512); } void get_capabilities(int i) { unsigned char cmd[6]; unsigned char *buffer; int rc, n; static char *loadmech[] = { "caddy", "tray", "pop-up", "", "changer", "cartridge changer", "", "" }; buffer = (unsigned char *) scsi_malloc(512); cmd[0] = MODE_SENSE; cmd[1] = (scsi_CDs[i].device->lun << 5) & 0xe0; cmd[2] = 0x2a; cmd[4] = 128; cmd[3] = cmd[5] = 0; rc = sr_do_ioctl(i, cmd, buffer, 128, 1, SCSI_DATA_READ); if (-EINVAL == rc) { /* failed, drive has'nt this mode page */ scsi_CDs[i].cdi.speed = 1; /* disable speed select, drive probably can't do this either */ scsi_CDs[i].cdi.mask |= CDC_SELECT_SPEED; scsi_free(buffer, 512); return; } n = buffer[3] + 4; scsi_CDs[i].cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; scsi_CDs[i].readcd_known = 1; scsi_CDs[i].readcd_cdda = buffer[n + 5] & 0x01; /* print some capability bits */ printk("sr%i: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", i, ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, scsi_CDs[i].cdi.speed, buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ buffer[n + 3] & 0x20 ? "dvd-ram " : "", buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ loadmech[buffer[n + 6] >> 5]); if ((buffer[n + 6] >> 5) == 0) /* caddy drives can't close tray... */ scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY; if ((buffer[n + 2] & 0x8) == 0) /* not a DVD drive */ scsi_CDs[i].cdi.mask |= CDC_DVD; if ((buffer[n + 3] & 0x20) == 0) { /* can't write DVD-RAM media */ scsi_CDs[i].cdi.mask |= CDC_DVD_RAM; } else { scsi_CDs[i].device->writeable = 1; } if ((buffer[n + 3] & 0x10) == 0) /* can't write DVD-R media */ scsi_CDs[i].cdi.mask |= CDC_DVD_R; if ((buffer[n + 3] & 0x2) == 0) /* can't write CD-RW media */ scsi_CDs[i].cdi.mask |= CDC_CD_RW; if ((buffer[n + 3] & 0x1) == 0) /* can't write CD-R media */ scsi_CDs[i].cdi.mask |= CDC_CD_R; if ((buffer[n + 6] & 0x8) == 0) /* can't eject */ scsi_CDs[i].cdi.mask |= CDC_OPEN_TRAY; if ((buffer[n + 6] >> 5) == mechtype_individual_changer || (buffer[n + 6] >> 5) == mechtype_cartridge_changer) scsi_CDs[i].cdi.capacity = cdrom_number_of_slots(&(scsi_CDs[i].cdi)); if (scsi_CDs[i].cdi.capacity <= 1) /* not a changer */ scsi_CDs[i].cdi.mask |= CDC_SELECT_DISC; /*else I don't think it can close its tray scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY; */ scsi_free(buffer, 512); } /* * sr_packet() is the entry point for the generic commands generated * by the Uniform CD-ROM layer. */ static int sr_packet(struct cdrom_device_info *cdi, struct cdrom_generic_command *cgc) { Scsi_Request *SRpnt; Scsi_Device *device = scsi_CDs[MINOR(cdi->dev)].device; unsigned char *buffer = cgc->buffer; int buflen; /* get the device */ SRpnt = scsi_allocate_request(device); if (SRpnt == NULL) return -ENODEV; /* this just doesn't seem right /axboe */ /* use buffer for ISA DMA */ buflen = (cgc->buflen + 511) & ~511; if (cgc->buffer && SRpnt->sr_host->unchecked_isa_dma && (virt_to_phys(cgc->buffer) + cgc->buflen - 1 > ISA_DMA_THRESHOLD)) { buffer = scsi_malloc(buflen); if (buffer == NULL) { printk("sr: SCSI DMA pool exhausted."); return -ENOMEM; } memcpy(buffer, cgc->buffer, cgc->buflen); } /* set the LUN */ cgc->cmd[1] |= device->lun << 5; /* do the locking and issue the command */ SRpnt->sr_request.rq_dev = cdi->dev; /* scsi_wait_req sets the command length */ SRpnt->sr_cmd_len = 0; SRpnt->sr_data_direction = cgc->data_direction; scsi_wait_req(SRpnt, (void *) cgc->cmd, (void *) buffer, cgc->buflen, SR_TIMEOUT, MAX_RETRIES); if ((cgc->stat = SRpnt->sr_result)) cgc->sense = (struct request_sense *) SRpnt->sr_sense_buffer; /* release */ SRpnt->sr_request.rq_dev = MKDEV(0, 0); scsi_release_request(SRpnt); SRpnt = NULL; /* write DMA buffer back if used */ if (buffer && (buffer != cgc->buffer)) { memcpy(cgc->buffer, buffer, cgc->buflen); scsi_free(buffer, buflen); } return cgc->stat; } static int sr_registered; static int sr_init() { int i; if (sr_template.dev_noticed == 0) return 0; if (!sr_registered) { if (devfs_register_blkdev(MAJOR_NR, "sr", &cdrom_fops)) { printk("Unable to get major %d for SCSI-CD\n", MAJOR_NR); return 1; } sr_registered++; } if (scsi_CDs) return 0; sr_template.dev_max = sr_template.dev_noticed + SR_EXTRA_DEVS; scsi_CDs = kmalloc(sr_template.dev_max * sizeof(Scsi_CD), GFP_ATOMIC); if (!scsi_CDs) goto cleanup_devfs; memset(scsi_CDs, 0, sr_template.dev_max * sizeof(Scsi_CD)); sr_sizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC); if (!sr_sizes) goto cleanup_cds; memset(sr_sizes, 0, sr_template.dev_max * sizeof(int)); sr_blocksizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC); if (!sr_blocksizes) goto cleanup_sizes; sr_hardsizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC); if (!sr_hardsizes) goto cleanup_blocksizes; /* * These are good guesses for the time being. */ for (i = 0; i < sr_template.dev_max; i++) { sr_blocksizes[i] = 2048; sr_hardsizes[i] = 2048; } blksize_size[MAJOR_NR] = sr_blocksizes; hardsect_size[MAJOR_NR] = sr_hardsizes; return 0; cleanup_blocksizes: kfree(sr_blocksizes); cleanup_sizes: kfree(sr_sizes); cleanup_cds: kfree(scsi_CDs); cleanup_devfs: devfs_unregister_blkdev(MAJOR_NR, "sr"); sr_registered--; return 1; } void sr_finish() { int i; char name[6]; blk_dev[MAJOR_NR].queue = sr_find_queue; blk_size[MAJOR_NR] = sr_sizes; for (i = 0; i < sr_template.nr_dev; ++i) { /* If we have already seen this, then skip it. Comes up * with loadable modules. */ if (scsi_CDs[i].capacity) continue; scsi_CDs[i].capacity = 0x1fffff; scsi_CDs[i].device->sector_size = 2048; /* A guess, just in case */ scsi_CDs[i].needs_sector_size = 1; scsi_CDs[i].device->changed = 1; /* force recheck CD type */ #if 0 /* seems better to leave this for later */ get_sectorsize(i); printk("Scd sectorsize = %d bytes.\n", scsi_CDs[i].sector_size); #endif scsi_CDs[i].use = 1; scsi_CDs[i].device->ten = 1; scsi_CDs[i].device->remap = 1; scsi_CDs[i].readcd_known = 0; scsi_CDs[i].readcd_cdda = 0; sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9); scsi_CDs[i].cdi.ops = &sr_dops; scsi_CDs[i].cdi.handle = &scsi_CDs[i]; scsi_CDs[i].cdi.dev = MKDEV(MAJOR_NR, i); scsi_CDs[i].cdi.mask = 0; scsi_CDs[i].cdi.capacity = 1; get_capabilities(i); sr_vendor_init(i); sprintf(name, "sr%d", i); strcpy(scsi_CDs[i].cdi.name, name); scsi_CDs[i].cdi.de = devfs_register (scsi_CDs[i].device->de, "cd", DEVFS_FL_DEFAULT, MAJOR_NR, i, S_IFBLK | S_IRUGO | S_IWUGO, &cdrom_fops, NULL); register_cdrom(&scsi_CDs[i].cdi); } /* If our host adapter is capable of scatter-gather, then we increase * the read-ahead to 16 blocks (32 sectors). If not, we use * a two block (4 sector) read ahead. */ if (scsi_CDs[0].device && scsi_CDs[0].device->host->sg_tablesize) read_ahead[MAJOR_NR] = 32; /* 32 sector read-ahead. Always removable. */ else read_ahead[MAJOR_NR] = 4; /* 4 sector read-ahead */ return; } static void sr_detach(Scsi_Device * SDp) { Scsi_CD *cpnt; int i; for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++) if (cpnt->device == SDp) { kdev_t devi = MKDEV(MAJOR_NR, i); struct super_block *sb = get_super(devi); /* * Since the cdrom is read-only, no need to sync the device. * We should be kind to our buffer cache, however. */ if (sb) invalidate_inodes(sb); invalidate_buffers(devi); /* * Reset things back to a sane state so that one can re-load a new * driver (perhaps the same one). */ unregister_cdrom(&(cpnt->cdi)); cpnt->device = NULL; cpnt->capacity = 0; SDp->attached--; sr_template.nr_dev--; sr_template.dev_noticed--; sr_sizes[i] = 0; return; } return; } static int __init init_sr(void) { sr_template.module = THIS_MODULE; return scsi_register_module(MODULE_SCSI_DEV, &sr_template); } static void __exit exit_sr(void) { scsi_unregister_module(MODULE_SCSI_DEV, &sr_template); devfs_unregister_blkdev(MAJOR_NR, "sr"); sr_registered--; if (scsi_CDs != NULL) { kfree(scsi_CDs); kfree(sr_sizes); sr_sizes = NULL; kfree(sr_blocksizes); sr_blocksizes = NULL; kfree(sr_hardsizes); sr_hardsizes = NULL; } blksize_size[MAJOR_NR] = NULL; hardsect_size[MAJOR_NR] = NULL; blk_size[MAJOR_NR] = NULL; read_ahead[MAJOR_NR] = 0; sr_template.dev_max = 0; } module_init(init_sr); module_exit(exit_sr);