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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/sr.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/sr.c')
-rw-r--r--drivers/scsi/sr.c965
1 files changed, 965 insertions, 0 deletions
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
new file mode 100644
index 0000000..2f259f2
--- /dev/null
+++ b/drivers/scsi/sr.c
@@ -0,0 +1,965 @@
+/*
+ * 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 <drew@colorado.edu>
+ *
+ * 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 <kraxel@cs.tu-berlin.de> to support the
+ * generic cdrom interface
+ *
+ * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
+ * interface, capabilities probe additions, ioctl cleanups, etc.
+ *
+ * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
+ *
+ * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
+ * transparently and lose the GHOST hack
+ *
+ * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * check resource allocation in sr_init and some cleanups
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/bio.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/cdrom.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <asm/uaccess.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
+#include <scsi/scsi_request.h>
+
+#include "scsi_logging.h"
+#include "sr.h"
+
+
+#define SR_DISKS 256
+
+#define MAX_RETRIES 3
+#define SR_TIMEOUT (30 * HZ)
+#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_IOCTLS|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 int sr_init_command(struct scsi_cmnd *);
+
+static struct scsi_driver sr_template = {
+ .owner = THIS_MODULE,
+ .gendrv = {
+ .name = "sr",
+ .probe = sr_probe,
+ .remove = sr_remove,
+ },
+ .init_command = sr_init_command,
+};
+
+static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
+static DEFINE_SPINLOCK(sr_index_lock);
+
+/* 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 DECLARE_MUTEX(sr_ref_sem);
+
+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 int sr_media_change(struct cdrom_device_info *, int);
+static int sr_packet(struct cdrom_device_info *, struct packet_command *);
+
+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 = 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);
+}
+
+/*
+ * 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;
+
+ down(&sr_ref_sem);
+ if (disk->private_data == NULL)
+ goto out;
+ cd = scsi_cd(disk);
+ kref_get(&cd->kref);
+ if (scsi_device_get(cd->device))
+ goto out_put;
+ goto out;
+
+ out_put:
+ kref_put(&cd->kref, sr_kref_release);
+ cd = NULL;
+ out:
+ up(&sr_ref_sem);
+ return cd;
+}
+
+static inline void scsi_cd_put(struct scsi_cd *cd)
+{
+ struct scsi_device *sdev = cd->device;
+
+ down(&sr_ref_sem);
+ kref_put(&cd->kref, sr_kref_release);
+ scsi_device_put(sdev);
+ up(&sr_ref_sem);
+}
+
+/*
+ * 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)
+{
+ struct scsi_cd *cd = cdi->handle;
+ int retval;
+
+ if (CDSL_CURRENT != slot) {
+ /* no changer support */
+ return -EINVAL;
+ }
+
+ retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES);
+ 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. */
+ cd->device->changed = 1;
+ return 1; /* This will force a flush, if called from
+ * check_disk_change */
+ };
+
+ retval = cd->device->changed;
+ cd->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.
+ */
+ cd->needs_sector_size = 1;
+ cd->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(struct scsi_cmnd * SCpnt)
+{
+ int result = SCpnt->result;
+ int this_count = SCpnt->bufflen;
+ 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
+ printk("sr.c 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 (driver_byte(result) != 0 && /* An error occurred */
+ (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;
+ if (!blk_fs_request(SCpnt->request))
+ break;
+ error_sector = (SCpnt->sense_buffer[3] << 24) |
+ (SCpnt->sense_buffer[4] << 16) |
+ (SCpnt->sense_buffer[5] << 8) |
+ SCpnt->sense_buffer[6];
+ 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 - SCpnt->request->sector) << 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:
+
+ /*
+ * An error occured, but it recovered. Inform the
+ * user, but make sure that it's not treated as a
+ * hard error.
+ */
+ scsi_print_sense("sr", SCpnt);
+ SCpnt->result = 0;
+ SCpnt->sense_buffer[0] = 0x0;
+ good_bytes = this_count;
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ /*
+ * 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_bytes, block_sectors << 9);
+}
+
+static int sr_init_command(struct scsi_cmnd * SCpnt)
+{
+ int block=0, this_count, s_size, timeout = SR_TIMEOUT;
+ struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
+
+ SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
+ cd->disk->disk_name, block));
+
+ if (!cd->device || !scsi_device_online(cd->device)) {
+ 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 (cd->device->changed) {
+ /*
+ * quietly refuse to do anything to a changed disc until the
+ * changed bit has been reset
+ */
+ return 0;
+ }
+
+ /*
+ * these are already setup, just copy cdb basically
+ */
+ if (SCpnt->request->flags & REQ_BLOCK_PC) {
+ struct request *rq = SCpnt->request;
+
+ if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd))
+ return 0;
+
+ memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd));
+ if (!rq->data_len)
+ SCpnt->sc_data_direction = DMA_NONE;
+ else if (rq_data_dir(rq) == WRITE)
+ SCpnt->sc_data_direction = DMA_TO_DEVICE;
+ else
+ SCpnt->sc_data_direction = DMA_FROM_DEVICE;
+
+ this_count = rq->data_len;
+ if (rq->timeout)
+ timeout = rq->timeout;
+
+ SCpnt->transfersize = rq->data_len;
+ goto queue;
+ }
+
+ if (!(SCpnt->request->flags & REQ_CMD)) {
+ blk_dump_rq_flags(SCpnt->request, "sr unsup command");
+ return 0;
+ }
+
+ /*
+ * we do lazy blocksize switching (when reading XA sectors,
+ * see CDROMREADMODE2 ioctl)
+ */
+ s_size = cd->device->sector_size;
+ if (s_size > 2048) {
+ if (!in_interrupt())
+ sr_set_blocklength(cd, 2048);
+ else
+ printk("sr: can't switch blocksize: in interrupt\n");
+ }
+
+ if (s_size != 512 && s_size != 1024 && s_size != 2048) {
+ printk("sr: bad sector size %d\n", s_size);
+ return 0;
+ }
+
+ if (rq_data_dir(SCpnt->request) == WRITE) {
+ if (!cd->device->writeable)
+ return 0;
+ SCpnt->cmnd[0] = WRITE_10;
+ SCpnt->sc_data_direction = DMA_TO_DEVICE;
+ cd->cdi.media_written = 1;
+ } else if (rq_data_dir(SCpnt->request) == READ) {
+ SCpnt->cmnd[0] = READ_10;
+ SCpnt->sc_data_direction = DMA_FROM_DEVICE;
+ } else {
+ blk_dump_rq_flags(SCpnt->request, "Unknown sr command");
+ return 0;
+ }
+
+ {
+ struct scatterlist *sg = SCpnt->request_buffer;
+ int i, size = 0;
+ for (i = 0; i < SCpnt->use_sg; i++)
+ size += sg[i].length;
+
+ if (size != SCpnt->request_bufflen && SCpnt->use_sg) {
+ printk(KERN_ERR "sr: mismatch count %d, bytes %d\n",
+ size, SCpnt->request_bufflen);
+ if (SCpnt->request_bufflen > size)
+ SCpnt->request_bufflen = SCpnt->bufflen = size;
+ }
+ }
+
+ /*
+ * request doesn't start on hw block boundary, add scatter pads
+ */
+ if (((unsigned int)SCpnt->request->sector % (s_size >> 9)) ||
+ (SCpnt->request_bufflen % s_size)) {
+ printk("sr: unaligned transfer\n");
+ return 0;
+ }
+
+ this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9);
+
+
+ SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
+ cd->cdi.name,
+ (rq_data_dir(SCpnt->request) == WRITE) ?
+ "writing" : "reading",
+ this_count, SCpnt->request->nr_sectors));
+
+ SCpnt->cmnd[1] = 0;
+ block = (unsigned int)SCpnt->request->sector / (s_size >> 9);
+
+ if (this_count > 0xffff) {
+ this_count = 0xffff;
+ SCpnt->request_bufflen = SCpnt->bufflen =
+ this_count * s_size;
+ }
+
+ 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 = cd->device->sector_size;
+ SCpnt->underflow = this_count << 9;
+
+queue:
+ SCpnt->allowed = MAX_RETRIES;
+ SCpnt->timeout_per_command = 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_block_open(struct inode *inode, struct file *file)
+{
+ struct gendisk *disk = inode->i_bdev->bd_disk;
+ struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk);
+ int ret = 0;
+
+ if(!(cd = scsi_cd_get(disk)))
+ return -ENXIO;
+
+ if((ret = cdrom_open(&cd->cdi, inode, file)) != 0)
+ scsi_cd_put(cd);
+
+ return ret;
+}
+
+static int sr_block_release(struct inode *inode, struct file *file)
+{
+ int ret;
+ struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk);
+ ret = cdrom_release(&cd->cdi, file);
+ if(ret)
+ return ret;
+
+ scsi_cd_put(cd);
+
+ return 0;
+}
+
+static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd,
+ unsigned long arg)
+{
+ struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk);
+ struct scsi_device *sdev = cd->device;
+
+ /*
+ * 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:
+ return scsi_ioctl(sdev, cmd, (void __user *)arg);
+ }
+ return cdrom_ioctl(file, &cd->cdi, inode, cmd, arg);
+}
+
+static int sr_block_media_changed(struct gendisk *disk)
+{
+ struct scsi_cd *cd = scsi_cd(disk);
+ return cdrom_media_changed(&cd->cdi);
+}
+
+static struct block_device_operations sr_bdops =
+{
+ .owner = THIS_MODULE,
+ .open = sr_block_open,
+ .release = sr_block_release,
+ .ioctl = sr_block_ioctl,
+ .media_changed = sr_block_media_changed,
+ /*
+ * No compat_ioctl for now because sr_block_ioctl never
+ * seems to pass arbitary ioctls down to host drivers.
+ */
+};
+
+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;
+
+ /*
+ * 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 (cd->needs_sector_size)
+ get_sectorsize(cd);
+ return 0;
+
+error_out:
+ return retval;
+}
+
+static void sr_release(struct cdrom_device_info *cdi)
+{
+ struct scsi_cd *cd = cdi->handle;
+
+ if (cd->device->sector_size > 2048)
+ sr_set_blocklength(cd, 2048);
+
+}
+
+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;
+
+ error = -ENODEV;
+ if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
+ goto fail;
+
+ error = -ENOMEM;
+ cd = kmalloc(sizeof(*cd), GFP_KERNEL);
+ if (!cd)
+ goto fail;
+ memset(cd, 0, sizeof(*cd));
+
+ kref_init(&cd->kref);
+
+ disk = alloc_disk(1);
+ if (!disk)
+ goto fail_free;
+
+ 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;
+ sprintf(disk->disk_name, "sr%d", minor);
+ disk->fops = &sr_bdops;
+ disk->flags = GENHD_FL_CD;
+
+ cd->device = sdev;
+ cd->disk = disk;
+ cd->driver = &sr_template;
+ cd->disk = disk;
+ cd->capacity = 0x1fffff;
+ cd->needs_sector_size = 1;
+ cd->device->changed = 1; /* force recheck CD type */
+ 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);
+
+ snprintf(disk->devfs_name, sizeof(disk->devfs_name),
+ "%s/cd", sdev->devfs_name);
+ disk->driverfs_dev = &sdev->sdev_gendev;
+ set_capacity(disk, cd->capacity);
+ disk->private_data = &cd->driver;
+ disk->queue = sdev->request_queue;
+ cd->cdi.disk = disk;
+
+ if (register_cdrom(&cd->cdi))
+ goto fail_put;
+
+ dev_set_drvdata(dev, cd);
+ disk->flags |= GENHD_FL_REMOVABLE;
+ add_disk(disk);
+
+ printk(KERN_DEBUG
+ "Attached scsi CD-ROM %s at scsi%d, channel %d, id %d, lun %d\n",
+ cd->cdi.name, sdev->host->host_no, sdev->channel,
+ sdev->id, sdev->lun);
+ return 0;
+
+fail_put:
+ put_disk(disk);
+fail_free:
+ kfree(cd);
+fail:
+ return error;
+}
+
+
+static void get_sectorsize(struct scsi_cd *cd)
+{
+ unsigned char cmd[10];
+ unsigned char *buffer;
+ int the_result, retries = 3;
+ int sector_size;
+ struct scsi_request *SRpnt = NULL;
+ request_queue_t *queue;
+
+ buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
+ if (!buffer)
+ goto Enomem;
+ SRpnt = scsi_allocate_request(cd->device, GFP_KERNEL);
+ if (!SRpnt)
+ goto Enomem;
+
+ do {
+ cmd[0] = READ_CAPACITY;
+ memset((void *) &cmd[1], 0, 9);
+ /* Mark as really busy */
+ SRpnt->sr_request->rq_status = RQ_SCSI_BUSY;
+ SRpnt->sr_cmd_len = 0;
+
+ memset(buffer, 0, 8);
+
+ /* Do the command and wait.. */
+ SRpnt->sr_data_direction = DMA_FROM_DEVICE;
+ 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) {
+ cd->capacity = 0x1fffff;
+ sector_size = 2048; /* A guess, just in case */
+ cd->needs_sector_size = 1;
+ } else {
+#if 0
+ if (cdrom_get_last_written(&cd->cdi,
+ &cd->capacity))
+#endif
+ cd->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:
+ cd->capacity *= 4;
+ /* fall through */
+ case 512:
+ break;
+ default:
+ printk("%s: unsupported sector size %d.\n",
+ cd->cdi.name, sector_size);
+ cd->capacity = 0;
+ cd->needs_sector_size = 1;
+ }
+
+ cd->device->sector_size = sector_size;
+
+ /*
+ * Add this so that we have the ability to correctly gauge
+ * what the device is capable of.
+ */
+ cd->needs_sector_size = 0;
+ set_capacity(cd->disk, cd->capacity);
+ }
+
+ queue = cd->device->request_queue;
+ blk_queue_hardsect_size(queue, sector_size);
+out:
+ kfree(buffer);
+ return;
+
+Enomem:
+ cd->capacity = 0x1fffff;
+ sector_size = 2048; /* A guess, just in case */
+ cd->needs_sector_size = 1;
+ if (SRpnt)
+ scsi_release_request(SRpnt);
+ goto out;
+}
+
+static void get_capabilities(struct scsi_cd *cd)
+{
+ unsigned char *buffer;
+ struct scsi_mode_data data;
+ struct scsi_request *SRpnt;
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ unsigned int the_result;
+ int retries, rc, n;
+
+ static char *loadmech[] =
+ {
+ "caddy",
+ "tray",
+ "pop-up",
+ "",
+ "changer",
+ "cartridge changer",
+ "",
+ ""
+ };
+
+ /* allocate a request for the TEST_UNIT_READY */
+ SRpnt = scsi_allocate_request(cd->device, GFP_KERNEL);
+ if (!SRpnt) {
+ printk(KERN_WARNING "(get_capabilities:) Request allocation "
+ "failure.\n");
+ return;
+ }
+
+ /* allocate transfer buffer */
+ buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
+ if (!buffer) {
+ printk(KERN_ERR "sr: out of memory.\n");
+ scsi_release_request(SRpnt);
+ return;
+ }
+
+ /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
+ * conditions are gone, or a timeout happens
+ */
+ retries = 0;
+ do {
+ memset((void *)cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = TEST_UNIT_READY;
+
+ SRpnt->sr_cmd_len = 0;
+ SRpnt->sr_sense_buffer[0] = 0;
+ SRpnt->sr_sense_buffer[2] = 0;
+ SRpnt->sr_data_direction = DMA_NONE;
+
+ scsi_wait_req (SRpnt, (void *) cmd, buffer,
+ 0, SR_TIMEOUT, MAX_RETRIES);
+
+ the_result = SRpnt->sr_result;
+ retries++;
+ } while (retries < 5 &&
+ (!scsi_status_is_good(the_result) ||
+ ((driver_byte(the_result) & DRIVER_SENSE) &&
+ SRpnt->sr_sense_buffer[2] == UNIT_ATTENTION)));
+
+ /* ask for mode page 0x2a */
+ rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
+ SR_TIMEOUT, 3, &data);
+
+ if (!scsi_status_is_good(rc)) {
+ /* 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);
+ scsi_release_request(SRpnt);
+ kfree(buffer);
+ printk("%s: scsi-1 drive\n", cd->cdi.name);
+ return;
+ }
+
+ n = data.header_length + data.block_descriptor_length;
+ cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
+ cd->readcd_known = 1;
+ cd->readcd_cdda = buffer[n + 5] & 0x01;
+ /* print some capability bits */
+ printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
+ ((buffer[n + 14] << 8) + buffer[n + 15]) / 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->device->writeable = 1;
+ }
+
+ scsi_release_request(SRpnt);
+ 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)
+{
+ if (cgc->timeout <= 0)
+ cgc->timeout = IOCTL_TIMEOUT;
+
+ sr_do_ioctl(cdi->handle, cgc);
+
+ return cgc->stat;
+}
+
+/**
+ * sr_kref_release - Called to free the scsi_cd structure
+ * @kref: pointer to embedded kref
+ *
+ * sr_ref_sem 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(disk->first_minor, sr_index_bits);
+ spin_unlock(&sr_index_lock);
+
+ unregister_cdrom(&cd->cdi);
+
+ disk->private_data = NULL;
+
+ put_disk(disk);
+
+ kfree(cd);
+}
+
+static int sr_remove(struct device *dev)
+{
+ struct scsi_cd *cd = dev_get_drvdata(dev);
+
+ del_gendisk(cd->disk);
+
+ down(&sr_ref_sem);
+ kref_put(&cd->kref, sr_kref_release);
+ up(&sr_ref_sem);
+
+ return 0;
+}
+
+static int __init init_sr(void)
+{
+ int rc;
+
+ rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
+ if (rc)
+ return rc;
+ return scsi_register_driver(&sr_template.gendrv);
+}
+
+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");
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