2 * bsg.c - block layer implementation of the sg v4 interface
4 * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs
5 * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com>
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License version 2. See the file "COPYING" in the main directory of this
9 * archive for more details.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/file.h>
15 #include <linux/blkdev.h>
16 #include <linux/poll.h>
17 #include <linux/cdev.h>
18 #include <linux/percpu.h>
19 #include <linux/uio.h>
20 #include <linux/idr.h>
21 #include <linux/bsg.h>
23 #include <scsi/scsi.h>
24 #include <scsi/scsi_ioctl.h>
25 #include <scsi/scsi_cmnd.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/scsi_driver.h>
30 #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver"
31 #define BSG_VERSION "0.4"
34 struct request_queue *queue;
36 struct list_head busy_list;
37 struct list_head done_list;
38 struct hlist_node dev_list;
42 wait_queue_head_t wq_done;
43 wait_queue_head_t wq_free;
44 char name[BUS_ID_SIZE];
54 #define BSG_DEFAULT_CMDS 64
55 #define BSG_MAX_DEVS 32768
60 #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ##args)
62 #define dprintk(fmt, args...)
65 static DEFINE_MUTEX(bsg_mutex);
66 static DEFINE_IDR(bsg_minor_idr);
68 #define BSG_LIST_ARRAY_SIZE 8
69 static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE];
71 static struct class *bsg_class;
74 static struct kmem_cache *bsg_cmd_cachep;
77 * our internal command type
80 struct bsg_device *bd;
81 struct list_head list;
87 char sense[SCSI_SENSE_BUFFERSIZE];
90 static void bsg_free_command(struct bsg_command *bc)
92 struct bsg_device *bd = bc->bd;
95 kmem_cache_free(bsg_cmd_cachep, bc);
97 spin_lock_irqsave(&bd->lock, flags);
99 spin_unlock_irqrestore(&bd->lock, flags);
101 wake_up(&bd->wq_free);
104 static struct bsg_command *bsg_alloc_command(struct bsg_device *bd)
106 struct bsg_command *bc = ERR_PTR(-EINVAL);
108 spin_lock_irq(&bd->lock);
110 if (bd->queued_cmds >= bd->max_queue)
114 spin_unlock_irq(&bd->lock);
116 bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL);
118 spin_lock_irq(&bd->lock);
120 bc = ERR_PTR(-ENOMEM);
125 INIT_LIST_HEAD(&bc->list);
126 dprintk("%s: returning free cmd %p\n", bd->name, bc);
129 spin_unlock_irq(&bd->lock);
133 static inline struct hlist_head *bsg_dev_idx_hash(int index)
135 return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)];
138 static int bsg_io_schedule(struct bsg_device *bd)
143 spin_lock_irq(&bd->lock);
145 BUG_ON(bd->done_cmds > bd->queued_cmds);
148 * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no
149 * work to do", even though we return -ENOSPC after this same test
150 * during bsg_write() -- there, it means our buffer can't have more
151 * bsg_commands added to it, thus has no space left.
153 if (bd->done_cmds == bd->queued_cmds) {
158 if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
163 prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE);
164 spin_unlock_irq(&bd->lock);
166 finish_wait(&bd->wq_done, &wait);
170 spin_unlock_irq(&bd->lock);
174 static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
175 struct sg_io_v4 *hdr, int has_write_perm)
177 if (hdr->request_len > BLK_MAX_CDB) {
178 rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL);
183 if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
187 if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) {
188 if (blk_verify_command(rq->cmd, has_write_perm))
190 } else if (!capable(CAP_SYS_RAWIO))
194 * fill in request structure
196 rq->cmd_len = hdr->request_len;
197 rq->cmd_type = REQ_TYPE_BLOCK_PC;
199 rq->timeout = (hdr->timeout * HZ) / 1000;
201 rq->timeout = q->sg_timeout;
203 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
209 * Check if sg_io_v4 from user is allowed and valid
212 bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw)
216 if (hdr->guard != 'Q')
218 if (hdr->dout_xfer_len > (q->max_sectors << 9) ||
219 hdr->din_xfer_len > (q->max_sectors << 9))
222 switch (hdr->protocol) {
223 case BSG_PROTOCOL_SCSI:
224 switch (hdr->subprotocol) {
225 case BSG_SUB_PROTOCOL_SCSI_CMD:
226 case BSG_SUB_PROTOCOL_SCSI_TRANSPORT:
236 *rw = hdr->dout_xfer_len ? WRITE : READ;
241 * map sg_io_v4 to a request.
243 static struct request *
244 bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
246 struct request_queue *q = bd->queue;
247 struct request *rq, *next_rq = NULL;
249 unsigned int dxfer_len;
252 dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
253 hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
256 ret = bsg_validate_sgv4_hdr(q, hdr, &rw);
261 * map scatter-gather elements seperately and string them to request
263 rq = blk_get_request(q, rw, GFP_KERNEL);
265 return ERR_PTR(-ENOMEM);
266 ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM,
271 if (rw == WRITE && hdr->din_xfer_len) {
272 if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
277 next_rq = blk_get_request(q, READ, GFP_KERNEL);
282 rq->next_rq = next_rq;
283 next_rq->cmd_type = rq->cmd_type;
285 dxferp = (void*)(unsigned long)hdr->din_xferp;
286 ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len);
291 if (hdr->dout_xfer_len) {
292 dxfer_len = hdr->dout_xfer_len;
293 dxferp = (void*)(unsigned long)hdr->dout_xferp;
294 } else if (hdr->din_xfer_len) {
295 dxfer_len = hdr->din_xfer_len;
296 dxferp = (void*)(unsigned long)hdr->din_xferp;
301 ret = blk_rq_map_user(q, rq, dxferp, dxfer_len);
307 if (rq->cmd != rq->__cmd)
311 blk_rq_unmap_user(next_rq->bio);
312 blk_put_request(next_rq);
318 * async completion call-back from the block layer, when scsi/ide/whatever
319 * calls end_that_request_last() on a request
321 static void bsg_rq_end_io(struct request *rq, int uptodate)
323 struct bsg_command *bc = rq->end_io_data;
324 struct bsg_device *bd = bc->bd;
327 dprintk("%s: finished rq %p bc %p, bio %p stat %d\n",
328 bd->name, rq, bc, bc->bio, uptodate);
330 bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration);
332 spin_lock_irqsave(&bd->lock, flags);
333 list_move_tail(&bc->list, &bd->done_list);
335 spin_unlock_irqrestore(&bd->lock, flags);
337 wake_up(&bd->wq_done);
341 * do final setup of a 'bc' and submit the matching 'rq' to the block
344 static void bsg_add_command(struct bsg_device *bd, struct request_queue *q,
345 struct bsg_command *bc, struct request *rq)
347 rq->sense = bc->sense;
351 * add bc command to busy queue and submit rq for io
356 bc->bidi_bio = rq->next_rq->bio;
357 bc->hdr.duration = jiffies;
358 spin_lock_irq(&bd->lock);
359 list_add_tail(&bc->list, &bd->busy_list);
360 spin_unlock_irq(&bd->lock);
362 dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc);
364 rq->end_io_data = bc;
365 blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io);
368 static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
370 struct bsg_command *bc = NULL;
372 spin_lock_irq(&bd->lock);
374 bc = list_first_entry(&bd->done_list, struct bsg_command, list);
378 spin_unlock_irq(&bd->lock);
384 * Get a finished command from the done list
386 static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd)
388 struct bsg_command *bc;
392 bc = bsg_next_done_cmd(bd);
396 if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
397 bc = ERR_PTR(-EAGAIN);
401 ret = wait_event_interruptible(bd->wq_done, bd->done_cmds);
403 bc = ERR_PTR(-ERESTARTSYS);
408 dprintk("%s: returning done %p\n", bd->name, bc);
413 static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
414 struct bio *bio, struct bio *bidi_bio)
418 dprintk("rq %p bio %p %u\n", rq, bio, rq->errors);
420 * fill in all the output members
422 hdr->device_status = status_byte(rq->errors);
423 hdr->transport_status = host_byte(rq->errors);
424 hdr->driver_status = driver_byte(rq->errors);
426 if (hdr->device_status || hdr->transport_status || hdr->driver_status)
427 hdr->info |= SG_INFO_CHECK;
428 hdr->response_len = 0;
430 if (rq->sense_len && hdr->response) {
431 int len = min_t(unsigned int, hdr->max_response_len,
434 ret = copy_to_user((void*)(unsigned long)hdr->response,
437 hdr->response_len = len;
443 hdr->dout_resid = rq->data_len;
444 hdr->din_resid = rq->next_rq->data_len;
445 blk_rq_unmap_user(bidi_bio);
446 blk_put_request(rq->next_rq);
447 } else if (rq_data_dir(rq) == READ)
448 hdr->din_resid = rq->data_len;
450 hdr->dout_resid = rq->data_len;
453 * If the request generated a negative error number, return it
454 * (providing we aren't already returning an error); if it's
455 * just a protocol response (i.e. non negative), that gets
458 if (!ret && rq->errors < 0)
461 blk_rq_unmap_user(bio);
462 if (rq->cmd != rq->__cmd)
469 static int bsg_complete_all_commands(struct bsg_device *bd)
471 struct bsg_command *bc;
474 dprintk("%s: entered\n", bd->name);
477 * wait for all commands to complete
481 ret = bsg_io_schedule(bd);
483 * look for -ENODATA specifically -- we'll sometimes get
484 * -ERESTARTSYS when we've taken a signal, but we can't
485 * return until we're done freeing the queue, so ignore
486 * it. The signal will get handled when we're done freeing
489 } while (ret != -ENODATA);
492 * discard done commands
496 spin_lock_irq(&bd->lock);
497 if (!bd->queued_cmds) {
498 spin_unlock_irq(&bd->lock);
501 spin_unlock_irq(&bd->lock);
503 bc = bsg_get_done_cmd(bd);
507 tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio,
512 bsg_free_command(bc);
519 __bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
520 const struct iovec *iov, ssize_t *bytes_read)
522 struct bsg_command *bc;
523 int nr_commands, ret;
525 if (count % sizeof(struct sg_io_v4))
529 nr_commands = count / sizeof(struct sg_io_v4);
530 while (nr_commands) {
531 bc = bsg_get_done_cmd(bd);
538 * this is the only case where we need to copy data back
539 * after completing the request. so do that here,
540 * bsg_complete_work() cannot do that for us
542 ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio,
545 if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr)))
548 bsg_free_command(bc);
553 buf += sizeof(struct sg_io_v4);
554 *bytes_read += sizeof(struct sg_io_v4);
561 static inline void bsg_set_block(struct bsg_device *bd, struct file *file)
563 if (file->f_flags & O_NONBLOCK)
564 clear_bit(BSG_F_BLOCK, &bd->flags);
566 set_bit(BSG_F_BLOCK, &bd->flags);
569 static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file)
571 if (file->f_mode & FMODE_WRITE)
572 set_bit(BSG_F_WRITE_PERM, &bd->flags);
574 clear_bit(BSG_F_WRITE_PERM, &bd->flags);
578 * Check if the error is a "real" error that we should return.
580 static inline int err_block_err(int ret)
582 if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN)
589 bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
591 struct bsg_device *bd = file->private_data;
595 dprintk("%s: read %Zd bytes\n", bd->name, count);
597 bsg_set_block(bd, file);
599 ret = __bsg_read(buf, count, bd, NULL, &bytes_read);
602 if (!bytes_read || (bytes_read && err_block_err(ret)))
608 static int __bsg_write(struct bsg_device *bd, const char __user *buf,
609 size_t count, ssize_t *bytes_written)
611 struct bsg_command *bc;
613 int ret, nr_commands;
615 if (count % sizeof(struct sg_io_v4))
618 nr_commands = count / sizeof(struct sg_io_v4);
622 while (nr_commands) {
623 struct request_queue *q = bd->queue;
625 bc = bsg_alloc_command(bd);
632 if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) {
638 * get a request, fill in the blanks, and add to request queue
640 rq = bsg_map_hdr(bd, &bc->hdr);
647 bsg_add_command(bd, q, bc, rq);
651 buf += sizeof(struct sg_io_v4);
652 *bytes_written += sizeof(struct sg_io_v4);
656 bsg_free_command(bc);
662 bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
664 struct bsg_device *bd = file->private_data;
665 ssize_t bytes_written;
668 dprintk("%s: write %Zd bytes\n", bd->name, count);
670 bsg_set_block(bd, file);
671 bsg_set_write_perm(bd, file);
674 ret = __bsg_write(bd, buf, count, &bytes_written);
675 *ppos = bytes_written;
678 * return bytes written on non-fatal errors
680 if (!bytes_written || (bytes_written && err_block_err(ret)))
683 dprintk("%s: returning %Zd\n", bd->name, bytes_written);
684 return bytes_written;
687 static struct bsg_device *bsg_alloc_device(void)
689 struct bsg_device *bd;
691 bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL);
695 spin_lock_init(&bd->lock);
697 bd->max_queue = BSG_DEFAULT_CMDS;
699 INIT_LIST_HEAD(&bd->busy_list);
700 INIT_LIST_HEAD(&bd->done_list);
701 INIT_HLIST_NODE(&bd->dev_list);
703 init_waitqueue_head(&bd->wq_free);
704 init_waitqueue_head(&bd->wq_done);
708 static void bsg_kref_release_function(struct kref *kref)
710 struct bsg_class_device *bcd =
711 container_of(kref, struct bsg_class_device, ref);
712 struct device *parent = bcd->parent;
715 bcd->release(bcd->parent);
720 static int bsg_put_device(struct bsg_device *bd)
722 int ret = 0, do_free;
723 struct request_queue *q = bd->queue;
725 mutex_lock(&bsg_mutex);
727 do_free = atomic_dec_and_test(&bd->ref_count);
731 dprintk("%s: tearing down\n", bd->name);
734 * close can always block
736 set_bit(BSG_F_BLOCK, &bd->flags);
739 * correct error detection baddies here again. it's the responsibility
740 * of the app to properly reap commands before close() if it wants
741 * fool-proof error detection
743 ret = bsg_complete_all_commands(bd);
745 hlist_del(&bd->dev_list);
748 mutex_unlock(&bsg_mutex);
749 kref_put(&q->bsg_dev.ref, bsg_kref_release_function);
755 static struct bsg_device *bsg_add_device(struct inode *inode,
756 struct request_queue *rq,
759 struct bsg_device *bd;
762 unsigned char buf[32];
764 ret = blk_get_queue(rq);
766 return ERR_PTR(-ENXIO);
768 bd = bsg_alloc_device();
771 return ERR_PTR(-ENOMEM);
775 bsg_set_block(bd, file);
777 atomic_set(&bd->ref_count, 1);
778 mutex_lock(&bsg_mutex);
779 hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode)));
781 strncpy(bd->name, rq->bsg_dev.class_dev->bus_id, sizeof(bd->name) - 1);
782 dprintk("bound to <%s>, max queue %d\n",
783 format_dev_t(buf, inode->i_rdev), bd->max_queue);
785 mutex_unlock(&bsg_mutex);
789 static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q)
791 struct bsg_device *bd;
792 struct hlist_node *entry;
794 mutex_lock(&bsg_mutex);
796 hlist_for_each_entry(bd, entry, bsg_dev_idx_hash(minor), dev_list) {
797 if (bd->queue == q) {
798 atomic_inc(&bd->ref_count);
804 mutex_unlock(&bsg_mutex);
808 static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
810 struct bsg_device *bd;
811 struct bsg_class_device *bcd;
814 * find the class device
816 mutex_lock(&bsg_mutex);
817 bcd = idr_find(&bsg_minor_idr, iminor(inode));
820 mutex_unlock(&bsg_mutex);
823 return ERR_PTR(-ENODEV);
825 bd = __bsg_get_device(iminor(inode), bcd->queue);
829 bd = bsg_add_device(inode, bcd->queue, file);
831 kref_put(&bcd->ref, bsg_kref_release_function);
836 static int bsg_open(struct inode *inode, struct file *file)
838 struct bsg_device *bd = bsg_get_device(inode, file);
843 file->private_data = bd;
847 static int bsg_release(struct inode *inode, struct file *file)
849 struct bsg_device *bd = file->private_data;
851 file->private_data = NULL;
852 return bsg_put_device(bd);
855 static unsigned int bsg_poll(struct file *file, poll_table *wait)
857 struct bsg_device *bd = file->private_data;
858 unsigned int mask = 0;
860 poll_wait(file, &bd->wq_done, wait);
861 poll_wait(file, &bd->wq_free, wait);
863 spin_lock_irq(&bd->lock);
864 if (!list_empty(&bd->done_list))
865 mask |= POLLIN | POLLRDNORM;
866 if (bd->queued_cmds >= bd->max_queue)
868 spin_unlock_irq(&bd->lock);
873 static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
875 struct bsg_device *bd = file->private_data;
876 int __user *uarg = (int __user *) arg;
883 case SG_GET_COMMAND_Q:
884 return put_user(bd->max_queue, uarg);
885 case SG_SET_COMMAND_Q: {
888 if (get_user(queue, uarg))
893 spin_lock_irq(&bd->lock);
894 bd->max_queue = queue;
895 spin_unlock_irq(&bd->lock);
902 case SG_GET_VERSION_NUM:
903 case SCSI_IOCTL_GET_IDLUN:
904 case SCSI_IOCTL_GET_BUS_NUMBER:
907 case SG_GET_RESERVED_SIZE:
908 case SG_SET_RESERVED_SIZE:
909 case SG_EMULATED_HOST:
910 case SCSI_IOCTL_SEND_COMMAND: {
911 void __user *uarg = (void __user *) arg;
912 return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg);
916 struct bio *bio, *bidi_bio = NULL;
919 if (copy_from_user(&hdr, uarg, sizeof(hdr)))
922 rq = bsg_map_hdr(bd, &hdr);
928 bidi_bio = rq->next_rq->bio;
929 blk_execute_rq(bd->queue, NULL, rq, 0);
930 ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
932 if (copy_to_user(uarg, &hdr, sizeof(hdr)))
938 * block device ioctls
942 return ioctl_by_bdev(bd->bdev, cmd, arg);
949 static const struct file_operations bsg_fops = {
954 .release = bsg_release,
955 .unlocked_ioctl = bsg_ioctl,
956 .owner = THIS_MODULE,
959 void bsg_unregister_queue(struct request_queue *q)
961 struct bsg_class_device *bcd = &q->bsg_dev;
966 mutex_lock(&bsg_mutex);
967 idr_remove(&bsg_minor_idr, bcd->minor);
968 sysfs_remove_link(&q->kobj, "bsg");
969 device_unregister(bcd->class_dev);
970 bcd->class_dev = NULL;
971 kref_put(&bcd->ref, bsg_kref_release_function);
972 mutex_unlock(&bsg_mutex);
974 EXPORT_SYMBOL_GPL(bsg_unregister_queue);
976 int bsg_register_queue(struct request_queue *q, struct device *parent,
977 const char *name, void (*release)(struct device *))
979 struct bsg_class_device *bcd;
982 struct device *class_dev = NULL;
988 devname = parent->bus_id;
991 * we need a proper transport to send commands, not a stacked device
997 memset(bcd, 0, sizeof(*bcd));
999 mutex_lock(&bsg_mutex);
1001 ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL);
1007 ret = idr_get_new(&bsg_minor_idr, bcd, &minor);
1011 if (minor >= BSG_MAX_DEVS) {
1012 printk(KERN_ERR "bsg: too many bsg devices\n");
1019 bcd->parent = get_device(parent);
1020 bcd->release = release;
1021 kref_init(&bcd->ref);
1022 dev = MKDEV(bsg_major, bcd->minor);
1023 class_dev = device_create(bsg_class, parent, dev, "%s", devname);
1024 if (IS_ERR(class_dev)) {
1025 ret = PTR_ERR(class_dev);
1028 bcd->class_dev = class_dev;
1031 ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
1033 goto unregister_class_dev;
1036 mutex_unlock(&bsg_mutex);
1039 unregister_class_dev:
1040 device_unregister(class_dev);
1044 idr_remove(&bsg_minor_idr, minor);
1046 mutex_unlock(&bsg_mutex);
1049 EXPORT_SYMBOL_GPL(bsg_register_queue);
1051 static struct cdev bsg_cdev;
1053 static int __init bsg_init(void)
1058 bsg_cmd_cachep = kmem_cache_create("bsg_cmd",
1059 sizeof(struct bsg_command), 0, 0, NULL);
1060 if (!bsg_cmd_cachep) {
1061 printk(KERN_ERR "bsg: failed creating slab cache\n");
1065 for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++)
1066 INIT_HLIST_HEAD(&bsg_device_list[i]);
1068 bsg_class = class_create(THIS_MODULE, "bsg");
1069 if (IS_ERR(bsg_class)) {
1070 ret = PTR_ERR(bsg_class);
1071 goto destroy_kmemcache;
1074 ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg");
1076 goto destroy_bsg_class;
1078 bsg_major = MAJOR(devid);
1080 cdev_init(&bsg_cdev, &bsg_fops);
1081 ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS);
1083 goto unregister_chrdev;
1085 printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION
1086 " loaded (major %d)\n", bsg_major);
1089 unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS);
1091 class_destroy(bsg_class);
1093 kmem_cache_destroy(bsg_cmd_cachep);
1097 MODULE_AUTHOR("Jens Axboe");
1098 MODULE_DESCRIPTION(BSG_DESCRIPTION);
1099 MODULE_LICENSE("GPL");
1101 device_initcall(bsg_init);