// SPDX-License-Identifier: GPL-2.0-only /* * 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 lose 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 #include #include #include #include #include #include #include #include #include #include #include #include #include /* For the door lock/unlock commands */ #include "scsi_logging.h" #include "sr.h" MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); #define SR_DISKS 256 #define SR_CAPABILITIES \ (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_DRIVE_STATUS| \ CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ CDC_MRW|CDC_MRW_W|CDC_RAM) static int sr_probe(struct device *); static int sr_remove(struct device *); static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); static int sr_done(struct scsi_cmnd *); static int sr_runtime_suspend(struct device *dev); static const struct dev_pm_ops sr_pm_ops = { .runtime_suspend = sr_runtime_suspend, }; static struct scsi_driver sr_template = { .gendrv = { .name = "sr", .owner = THIS_MODULE, .probe = sr_probe, .remove = sr_remove, .pm = &sr_pm_ops, }, .init_command = sr_init_command, .done = sr_done, }; static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; static DEFINE_SPINLOCK(sr_index_lock); static struct lock_class_key sr_bio_compl_lkclass; /* This semaphore is used to mediate the 0->1 reference get in the * face of object destruction (i.e. we can't allow a get on an * object after last put) */ static DEFINE_MUTEX(sr_ref_mutex); static int sr_open(struct cdrom_device_info *, int); static void sr_release(struct cdrom_device_info *); static void get_sectorsize(struct scsi_cd *); static void get_capabilities(struct scsi_cd *); static unsigned int sr_check_events(struct cdrom_device_info *cdi, unsigned int clearing, int slot); static int sr_packet(struct cdrom_device_info *, struct packet_command *); static const struct cdrom_device_ops sr_dops = { .open = sr_open, .release = sr_release, .drive_status = sr_drive_status, .check_events = sr_check_events, .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, .capability = SR_CAPABILITIES, .generic_packet = sr_packet, }; static void sr_kref_release(struct kref *kref); static inline struct scsi_cd *scsi_cd(struct gendisk *disk) { return container_of(disk->private_data, struct scsi_cd, driver); } static int sr_runtime_suspend(struct device *dev) { struct scsi_cd *cd = dev_get_drvdata(dev); if (!cd) /* E.g.: runtime suspend following sr_remove() */ return 0; if (cd->media_present) return -EBUSY; else return 0; } /* * The get and put routines for the struct scsi_cd. Note this entity * has a scsi_device pointer and owns a reference to this. */ static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) { struct scsi_cd *cd = NULL; mutex_lock(&sr_ref_mutex); if (disk->private_data == NULL) goto out; cd = scsi_cd(disk); kref_get(&cd->kref); if (scsi_device_get(cd->device)) { kref_put(&cd->kref, sr_kref_release); cd = NULL; } out: mutex_unlock(&sr_ref_mutex); return cd; } static void scsi_cd_put(struct scsi_cd *cd) { struct scsi_device *sdev = cd->device; mutex_lock(&sr_ref_mutex); kref_put(&cd->kref, sr_kref_release); scsi_device_put(sdev); mutex_unlock(&sr_ref_mutex); } static unsigned int sr_get_events(struct scsi_device *sdev) { u8 buf[8]; u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 1, /* polled */ 0, 0, /* reserved */ 1 << 4, /* notification class: media */ 0, 0, /* reserved */ 0, sizeof(buf), /* allocation length */ 0, /* control */ }; struct event_header *eh = (void *)buf; struct media_event_desc *med = (void *)(buf + 4); struct scsi_sense_hdr sshdr; int result; result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) return DISK_EVENT_MEDIA_CHANGE; if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) return 0; if (eh->nea || eh->notification_class != 0x4) return 0; if (med->media_event_code == 1) return DISK_EVENT_EJECT_REQUEST; else if (med->media_event_code == 2) return DISK_EVENT_MEDIA_CHANGE; else if (med->media_event_code == 3) return DISK_EVENT_MEDIA_CHANGE; return 0; } /* * This function checks to see if the media has been changed or eject * button has been pressed. It is possible that we have already * sensed a change, or the drive may have sensed one and not yet * reported it. The past events are accumulated in sdev->changed and * returned together with the current state. */ static unsigned int sr_check_events(struct cdrom_device_info *cdi, unsigned int clearing, int slot) { struct scsi_cd *cd = cdi->handle; bool last_present; struct scsi_sense_hdr sshdr; unsigned int events; int ret; /* no changer support */ if (CDSL_CURRENT != slot) return 0; events = sr_get_events(cd->device); cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; /* * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree * for several times in a row. We rely on TUR only for this likely * broken device, to prevent generating incorrect media changed * events for every open(). */ if (cd->ignore_get_event) { events &= ~DISK_EVENT_MEDIA_CHANGE; goto do_tur; } /* * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE * is being cleared. Note that there are devices which hang * if asked to execute TUR repeatedly. */ if (cd->device->changed) { events |= DISK_EVENT_MEDIA_CHANGE; cd->device->changed = 0; cd->tur_changed = true; } if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) return events; do_tur: /* let's see whether the media is there with TUR */ last_present = cd->media_present; ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); /* * Media is considered to be present if TUR succeeds or fails with * sense data indicating something other than media-not-present * (ASC 0x3a). */ cd->media_present = scsi_status_is_good(ret) || (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); if (last_present != cd->media_present) cd->device->changed = 1; if (cd->device->changed) { events |= DISK_EVENT_MEDIA_CHANGE; cd->device->changed = 0; cd->tur_changed = true; } if (cd->ignore_get_event) return events; /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ if (!cd->tur_changed) { if (cd->get_event_changed) { if (cd->tur_mismatch++ > 8) { sr_printk(KERN_WARNING, cd, "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); cd->ignore_get_event = true; } } else { cd->tur_mismatch = 0; } } cd->tur_changed = false; cd->get_event_changed = false; return events; } /* * sr_done is the interrupt routine for the device driver. * * It will be notified on the end of a SCSI read / write, and will take one * of several actions based on success or failure. */ static int sr_done(struct scsi_cmnd *SCpnt) { int result = SCpnt->result; int this_count = scsi_bufflen(SCpnt); int good_bytes = (result == 0 ? this_count : 0); int block_sectors = 0; long error_sector; struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); #ifdef DEBUG scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); #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 (scsi_status_is_check_condition(result) && (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ switch (SCpnt->sense_buffer[2]) { case MEDIUM_ERROR: case VOLUME_OVERFLOW: case ILLEGAL_REQUEST: if (!(SCpnt->sense_buffer[0] & 0x90)) break; error_sector = get_unaligned_be32(&SCpnt->sense_buffer[3]); if (SCpnt->request->bio != NULL) block_sectors = bio_sectors(SCpnt->request->bio); if (block_sectors < 4) block_sectors = 4; if (cd->device->sector_size == 2048) error_sector <<= 2; error_sector &= ~(block_sectors - 1); good_bytes = (error_sector - blk_rq_pos(SCpnt->request)) << 9; if (good_bytes < 0 || good_bytes >= this_count) good_bytes = 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 < get_capacity(cd->disk) && cd->capacity - error_sector < 4 * 75) set_capacity(cd->disk, error_sector); break; case RECOVERED_ERROR: good_bytes = this_count; break; default: break; } } return good_bytes; } static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) { int block = 0, this_count, s_size; struct scsi_cd *cd; struct request *rq = SCpnt->request; blk_status_t ret; ret = scsi_alloc_sgtables(SCpnt); if (ret != BLK_STS_OK) return ret; cd = scsi_cd(rq->rq_disk); SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, "Doing sr request, block = %d\n", block)); if (!cd->device || !scsi_device_online(cd->device)) { SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "Finishing %u sectors\n", blk_rq_sectors(rq))); SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "Retry with 0x%p\n", SCpnt)); goto out; } if (cd->device->changed) { /* * quietly refuse to do anything to a changed disc until the * changed bit has been reset */ goto out; } s_size = cd->device->sector_size; if (s_size != 512 && s_size != 1024 && s_size != 2048) { scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); goto out; } switch (req_op(rq)) { case REQ_OP_WRITE: if (!cd->writeable) goto out; SCpnt->cmnd[0] = WRITE_10; cd->cdi.media_written = 1; break; case REQ_OP_READ: SCpnt->cmnd[0] = READ_10; break; default: blk_dump_rq_flags(rq, "Unknown sr command"); goto out; } { struct scatterlist *sg; int i, size = 0, sg_count = scsi_sg_count(SCpnt); scsi_for_each_sg(SCpnt, sg, sg_count, i) size += sg->length; if (size != scsi_bufflen(SCpnt)) { scmd_printk(KERN_ERR, SCpnt, "mismatch count %d, bytes %d\n", size, scsi_bufflen(SCpnt)); if (scsi_bufflen(SCpnt) > size) SCpnt->sdb.length = size; } } /* * request doesn't start on hw block boundary, add scatter pads */ if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || (scsi_bufflen(SCpnt) % s_size)) { scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); goto out; } this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "%s %d/%u 512 byte blocks.\n", (rq_data_dir(rq) == WRITE) ? "writing" : "reading", this_count, blk_rq_sectors(rq))); SCpnt->cmnd[1] = 0; block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); if (this_count > 0xffff) { this_count = 0xffff; SCpnt->sdb.length = this_count * s_size; } put_unaligned_be32(block, &SCpnt->cmnd[2]); SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; put_unaligned_be16(this_count, &SCpnt->cmnd[7]); /* * 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 = cd->device->sector_size; SCpnt->underflow = this_count << 9; SCpnt->allowed = MAX_RETRIES; SCpnt->cmd_len = 10; /* * This indicates that the command is ready from our end to be queued. */ return BLK_STS_OK; out: scsi_free_sgtables(SCpnt); return BLK_STS_IOERR; } static void sr_revalidate_disk(struct scsi_cd *cd) { struct scsi_sense_hdr sshdr; /* if the unit is not ready, nothing more to do */ if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) return; sr_cd_check(&cd->cdi); get_sectorsize(cd); } static int sr_block_open(struct block_device *bdev, fmode_t mode) { struct scsi_cd *cd; struct scsi_device *sdev; int ret = -ENXIO; cd = scsi_cd_get(bdev->bd_disk); if (!cd) goto out; sdev = cd->device; scsi_autopm_get_device(sdev); if (bdev_check_media_change(bdev)) sr_revalidate_disk(cd); mutex_lock(&cd->lock); ret = cdrom_open(&cd->cdi, bdev, mode); mutex_unlock(&cd->lock); scsi_autopm_put_device(sdev); if (ret) scsi_cd_put(cd); out: return ret; } static void sr_block_release(struct gendisk *disk, fmode_t mode) { struct scsi_cd *cd = scsi_cd(disk); mutex_lock(&cd->lock); cdrom_release(&cd->cdi, mode); mutex_unlock(&cd->lock); scsi_cd_put(cd); } static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg) { struct scsi_cd *cd = scsi_cd(bdev->bd_disk); struct scsi_device *sdev = cd->device; void __user *argp = (void __user *)arg; int ret; mutex_lock(&cd->lock); ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, (mode & FMODE_NDELAY) != 0); if (ret) goto out; scsi_autopm_get_device(sdev); /* * Send SCSI addressing ioctls directly to mid level, send other * ioctls to cdrom/block level. */ switch (cmd) { case SCSI_IOCTL_GET_IDLUN: case SCSI_IOCTL_GET_BUS_NUMBER: ret = scsi_ioctl(sdev, cmd, argp); goto put; } ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); if (ret != -ENOSYS) goto put; ret = scsi_ioctl(sdev, cmd, argp); put: scsi_autopm_put_device(sdev); out: mutex_unlock(&cd->lock); return ret; } #ifdef CONFIG_COMPAT static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg) { struct scsi_cd *cd = scsi_cd(bdev->bd_disk); struct scsi_device *sdev = cd->device; void __user *argp = compat_ptr(arg); int ret; mutex_lock(&cd->lock); ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, (mode & FMODE_NDELAY) != 0); if (ret) goto out; scsi_autopm_get_device(sdev); /* * Send SCSI addressing ioctls directly to mid level, send other * ioctls to cdrom/block level. */ switch (cmd) { case SCSI_IOCTL_GET_IDLUN: case SCSI_IOCTL_GET_BUS_NUMBER: ret = scsi_compat_ioctl(sdev, cmd, argp); goto put; } ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); if (ret != -ENOSYS) goto put; ret = scsi_compat_ioctl(sdev, cmd, argp); put: scsi_autopm_put_device(sdev); out: mutex_unlock(&cd->lock); return ret; } #endif static unsigned int sr_block_check_events(struct gendisk *disk, unsigned int clearing) { unsigned int ret = 0; struct scsi_cd *cd; cd = scsi_cd_get(disk); if (!cd) return 0; if (!atomic_read(&cd->device->disk_events_disable_depth)) ret = cdrom_check_events(&cd->cdi, clearing); scsi_cd_put(cd); return ret; } static const struct block_device_operations sr_bdops = { .owner = THIS_MODULE, .open = sr_block_open, .release = sr_block_release, .ioctl = sr_block_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = sr_block_compat_ioctl, #endif .check_events = sr_block_check_events, }; static int sr_open(struct cdrom_device_info *cdi, int purpose) { struct scsi_cd *cd = cdi->handle; struct scsi_device *sdev = cd->device; int retval; /* * If the device is in error recovery, wait until it is done. * If the device is offline, then disallow any access to it. */ retval = -ENXIO; if (!scsi_block_when_processing_errors(sdev)) goto error_out; return 0; error_out: return retval; } static void sr_release(struct cdrom_device_info *cdi) { } static int sr_probe(struct device *dev) { struct scsi_device *sdev = to_scsi_device(dev); struct gendisk *disk; struct scsi_cd *cd; int minor, error; scsi_autopm_get_device(sdev); error = -ENODEV; if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) goto fail; error = -ENOMEM; cd = kzalloc(sizeof(*cd), GFP_KERNEL); if (!cd) goto fail; kref_init(&cd->kref); disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE, &sr_bio_compl_lkclass); if (!disk) goto fail_free; mutex_init(&cd->lock); spin_lock(&sr_index_lock); minor = find_first_zero_bit(sr_index_bits, SR_DISKS); if (minor == SR_DISKS) { spin_unlock(&sr_index_lock); error = -EBUSY; goto fail_put; } __set_bit(minor, sr_index_bits); spin_unlock(&sr_index_lock); disk->major = SCSI_CDROM_MAJOR; disk->first_minor = minor; disk->minors = 1; sprintf(disk->disk_name, "sr%d", minor); disk->fops = &sr_bdops; disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); cd->device = sdev; cd->disk = disk; cd->driver = &sr_template; cd->disk = disk; cd->capacity = 0x1fffff; cd->device->changed = 1; /* force recheck CD type */ cd->media_present = 1; cd->use = 1; cd->readcd_known = 0; cd->readcd_cdda = 0; cd->cdi.ops = &sr_dops; cd->cdi.handle = cd; cd->cdi.mask = 0; cd->cdi.capacity = 1; sprintf(cd->cdi.name, "sr%d", minor); sdev->sector_size = 2048; /* A guess, just in case */ /* FIXME: need to handle a get_capabilities failure properly ?? */ get_capabilities(cd); sr_vendor_init(cd); set_capacity(disk, cd->capacity); disk->private_data = &cd->driver; if (register_cdrom(disk, &cd->cdi)) goto fail_minor; /* * Initialize block layer runtime PM stuffs before the * periodic event checking request gets started in add_disk. */ blk_pm_runtime_init(sdev->request_queue, dev); dev_set_drvdata(dev, cd); disk->flags |= GENHD_FL_REMOVABLE; sr_revalidate_disk(cd); device_add_disk(&sdev->sdev_gendev, disk, NULL); sdev_printk(KERN_DEBUG, sdev, "Attached scsi CD-ROM %s\n", cd->cdi.name); scsi_autopm_put_device(cd->device); return 0; fail_minor: spin_lock(&sr_index_lock); clear_bit(minor, sr_index_bits); spin_unlock(&sr_index_lock); fail_put: put_disk(disk); mutex_destroy(&cd->lock); fail_free: kfree(cd); fail: scsi_autopm_put_device(sdev); return error; } static void get_sectorsize(struct scsi_cd *cd) { unsigned char cmd[10]; unsigned char buffer[8]; int the_result, retries = 3; int sector_size; struct request_queue *queue; do { cmd[0] = READ_CAPACITY; memset((void *) &cmd[1], 0, 9); memset(buffer, 0, sizeof(buffer)); /* Do the command and wait.. */ the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, buffer, sizeof(buffer), NULL, SR_TIMEOUT, MAX_RETRIES, NULL); retries--; } while (the_result && retries); if (the_result) { cd->capacity = 0x1fffff; sector_size = 2048; /* A guess, just in case */ } else { long last_written; cd->capacity = 1 + get_unaligned_be32(&buffer[0]); /* * READ_CAPACITY doesn't return the correct size on * certain UDF media. If last_written is larger, use * it instead. * * http://bugzilla.kernel.org/show_bug.cgi?id=9668 */ if (!cdrom_get_last_written(&cd->cdi, &last_written)) cd->capacity = max_t(long, cd->capacity, last_written); sector_size = get_unaligned_be32(&buffer[4]); 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; fallthrough; case 2048: cd->capacity *= 4; fallthrough; case 512: break; default: sr_printk(KERN_INFO, cd, "unsupported sector size %d.", sector_size); cd->capacity = 0; } cd->device->sector_size = sector_size; /* * Add this so that we have the ability to correctly gauge * what the device is capable of. */ set_capacity(cd->disk, cd->capacity); } queue = cd->device->request_queue; blk_queue_logical_block_size(queue, sector_size); return; } static void get_capabilities(struct scsi_cd *cd) { unsigned char *buffer; struct scsi_mode_data data; struct scsi_sense_hdr sshdr; unsigned int ms_len = 128; int rc, n; static const char *loadmech[] = { "caddy", "tray", "pop-up", "", "changer", "cartridge changer", "", "" }; /* allocate transfer buffer */ buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); if (!buffer) { sr_printk(KERN_ERR, cd, "out of memory.\n"); return; } /* eat unit attentions */ scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); /* ask for mode page 0x2a */ rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, SR_TIMEOUT, 3, &data, NULL); if (rc < 0 || data.length > ms_len || data.header_length + data.block_descriptor_length > data.length) { /* failed, drive doesn't have capabilities mode page */ cd->cdi.speed = 1; cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | CDC_DVD | CDC_DVD_RAM | CDC_SELECT_DISC | CDC_SELECT_SPEED | CDC_MRW | CDC_MRW_W | CDC_RAM); kfree(buffer); sr_printk(KERN_INFO, cd, "scsi-1 drive"); return; } n = data.header_length + data.block_descriptor_length; cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; cd->readcd_known = 1; cd->readcd_cdda = buffer[n + 5] & 0x01; /* print some capability bits */ sr_printk(KERN_INFO, cd, "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", get_unaligned_be16(&buffer[n + 14]) / 176, cd->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... */ cd->cdi.mask |= CDC_CLOSE_TRAY; if ((buffer[n + 2] & 0x8) == 0) /* not a DVD drive */ cd->cdi.mask |= CDC_DVD; if ((buffer[n + 3] & 0x20) == 0) /* can't write DVD-RAM media */ cd->cdi.mask |= CDC_DVD_RAM; if ((buffer[n + 3] & 0x10) == 0) /* can't write DVD-R media */ cd->cdi.mask |= CDC_DVD_R; if ((buffer[n + 3] & 0x2) == 0) /* can't write CD-RW media */ cd->cdi.mask |= CDC_CD_RW; if ((buffer[n + 3] & 0x1) == 0) /* can't write CD-R media */ cd->cdi.mask |= CDC_CD_R; if ((buffer[n + 6] & 0x8) == 0) /* can't eject */ cd->cdi.mask |= CDC_OPEN_TRAY; if ((buffer[n + 6] >> 5) == mechtype_individual_changer || (buffer[n + 6] >> 5) == mechtype_cartridge_changer) cd->cdi.capacity = cdrom_number_of_slots(&cd->cdi); if (cd->cdi.capacity <= 1) /* not a changer */ cd->cdi.mask |= CDC_SELECT_DISC; /*else I don't think it can close its tray cd->cdi.mask |= CDC_CLOSE_TRAY; */ /* * if DVD-RAM, MRW-W or CD-RW, we are randomly writable */ if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { cd->writeable = 1; } kfree(buffer); } /* * 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 packet_command *cgc) { struct scsi_cd *cd = cdi->handle; struct scsi_device *sdev = cd->device; if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) return -EDRIVE_CANT_DO_THIS; if (cgc->timeout <= 0) cgc->timeout = IOCTL_TIMEOUT; sr_do_ioctl(cd, cgc); return cgc->stat; } /** * sr_kref_release - Called to free the scsi_cd structure * @kref: pointer to embedded kref * * sr_ref_mutex must be held entering this routine. Because it is * called on last put, you should always use the scsi_cd_get() * scsi_cd_put() helpers which manipulate the semaphore directly * and never do a direct kref_put(). **/ static void sr_kref_release(struct kref *kref) { struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); struct gendisk *disk = cd->disk; spin_lock(&sr_index_lock); clear_bit(MINOR(disk_devt(disk)), sr_index_bits); spin_unlock(&sr_index_lock); unregister_cdrom(&cd->cdi); disk->private_data = NULL; put_disk(disk); mutex_destroy(&cd->lock); kfree(cd); } static int sr_remove(struct device *dev) { struct scsi_cd *cd = dev_get_drvdata(dev); scsi_autopm_get_device(cd->device); del_gendisk(cd->disk); dev_set_drvdata(dev, NULL); mutex_lock(&sr_ref_mutex); kref_put(&cd->kref, sr_kref_release); mutex_unlock(&sr_ref_mutex); return 0; } static int __init init_sr(void) { int rc; rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); if (rc) return rc; rc = scsi_register_driver(&sr_template.gendrv); if (rc) unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); return rc; } static void __exit exit_sr(void) { scsi_unregister_driver(&sr_template.gendrv); unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); } module_init(init_sr); module_exit(exit_sr); MODULE_LICENSE("GPL");