2 * bsg.c - block layer implementation of the sg v3 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.
14 * - Should this get merged, block/scsi_ioctl.c will be migrated into
15 * this file. To keep maintenance down, it's easier to have them
16 * seperated right now.
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/file.h>
22 #include <linux/blkdev.h>
23 #include <linux/poll.h>
24 #include <linux/cdev.h>
25 #include <linux/percpu.h>
26 #include <linux/uio.h>
27 #include <linux/bsg.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_ioctl.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_driver.h>
36 const static char bsg_version[] = "block layer sg (bsg) 0.4";
39 request_queue_t *queue;
41 struct list_head busy_list;
42 struct list_head done_list;
43 struct hlist_node dev_list;
48 wait_queue_head_t wq_done;
49 wait_queue_head_t wq_free;
50 char name[BUS_ID_SIZE];
60 #define BSG_DEFAULT_CMDS 64
61 #define BSG_MAX_DEVS 32768
66 #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ##args)
68 #define dprintk(fmt, args...)
74 #define BSG_MAJOR (240)
76 static DEFINE_MUTEX(bsg_mutex);
77 static int bsg_device_nr, bsg_minor_idx;
79 #define BSG_LIST_ARRAY_SIZE 8
80 #define bsg_list_idx(minor) ((minor) & (BSG_LIST_ARRAY_SIZE - 1))
81 static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE];
83 static struct class *bsg_class;
84 static LIST_HEAD(bsg_class_list);
86 static struct kmem_cache *bsg_cmd_cachep;
89 * our internal command type
92 struct bsg_device *bd;
93 struct list_head list;
99 struct sg_io_v4 __user *uhdr;
100 char sense[SCSI_SENSE_BUFFERSIZE];
103 static void bsg_free_command(struct bsg_command *bc)
105 struct bsg_device *bd = bc->bd;
108 kmem_cache_free(bsg_cmd_cachep, bc);
110 spin_lock_irqsave(&bd->lock, flags);
112 spin_unlock_irqrestore(&bd->lock, flags);
114 wake_up(&bd->wq_free);
117 static struct bsg_command *bsg_alloc_command(struct bsg_device *bd)
119 struct bsg_command *bc = ERR_PTR(-EINVAL);
121 spin_lock_irq(&bd->lock);
123 if (bd->queued_cmds >= bd->max_queue)
127 spin_unlock_irq(&bd->lock);
129 bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL);
131 spin_lock_irq(&bd->lock);
133 bc = ERR_PTR(-ENOMEM);
138 INIT_LIST_HEAD(&bc->list);
139 dprintk("%s: returning free cmd %p\n", bd->name, bc);
142 spin_unlock_irq(&bd->lock);
147 bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
151 static int bsg_io_schedule(struct bsg_device *bd)
156 spin_lock_irq(&bd->lock);
158 BUG_ON(bd->done_cmds > bd->queued_cmds);
161 * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no
162 * work to do", even though we return -ENOSPC after this same test
163 * during bsg_write() -- there, it means our buffer can't have more
164 * bsg_commands added to it, thus has no space left.
166 if (bd->done_cmds == bd->queued_cmds) {
171 if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
176 prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE);
177 spin_unlock_irq(&bd->lock);
179 finish_wait(&bd->wq_done, &wait);
183 spin_unlock_irq(&bd->lock);
187 static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq,
188 struct sg_io_v4 *hdr, int has_write_perm)
190 memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
192 if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
196 if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) {
197 if (blk_verify_command(rq->cmd, has_write_perm))
199 } else if (!capable(CAP_SYS_RAWIO))
203 * fill in request structure
205 rq->cmd_len = hdr->request_len;
206 rq->cmd_type = REQ_TYPE_BLOCK_PC;
208 rq->timeout = (hdr->timeout * HZ) / 1000;
210 rq->timeout = q->sg_timeout;
212 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
218 * Check if sg_io_v4 from user is allowed and valid
221 bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw)
225 if (hdr->guard != 'Q')
227 if (hdr->request_len > BLK_MAX_CDB)
229 if (hdr->dout_xfer_len > (q->max_sectors << 9) ||
230 hdr->din_xfer_len > (q->max_sectors << 9))
233 switch (hdr->protocol) {
234 case BSG_PROTOCOL_SCSI:
235 switch (hdr->subprotocol) {
236 case BSG_SUB_PROTOCOL_SCSI_CMD:
237 case BSG_SUB_PROTOCOL_SCSI_TRANSPORT:
247 *rw = hdr->dout_xfer_len ? WRITE : READ;
252 * map sg_io_v4 to a request.
254 static struct request *
255 bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
257 request_queue_t *q = bd->queue;
258 struct request *rq, *next_rq = NULL;
260 unsigned int dxfer_len;
263 dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
264 hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
267 ret = bsg_validate_sgv4_hdr(q, hdr, &rw);
272 * map scatter-gather elements seperately and string them to request
274 rq = blk_get_request(q, rw, GFP_KERNEL);
276 return ERR_PTR(-ENOMEM);
277 ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM,
282 if (rw == WRITE && hdr->din_xfer_len) {
283 if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
288 next_rq = blk_get_request(q, READ, GFP_KERNEL);
293 rq->next_rq = next_rq;
295 dxferp = (void*)(unsigned long)hdr->din_xferp;
296 ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len);
301 if (hdr->dout_xfer_len) {
302 dxfer_len = hdr->dout_xfer_len;
303 dxferp = (void*)(unsigned long)hdr->dout_xferp;
304 } else if (hdr->din_xfer_len) {
305 dxfer_len = hdr->din_xfer_len;
306 dxferp = (void*)(unsigned long)hdr->din_xferp;
311 ret = blk_rq_map_user(q, rq, dxferp, dxfer_len);
319 blk_rq_unmap_user(next_rq->bio);
320 blk_put_request(next_rq);
326 * async completion call-back from the block layer, when scsi/ide/whatever
327 * calls end_that_request_last() on a request
329 static void bsg_rq_end_io(struct request *rq, int uptodate)
331 struct bsg_command *bc = rq->end_io_data;
332 struct bsg_device *bd = bc->bd;
335 dprintk("%s: finished rq %p bc %p, bio %p stat %d\n",
336 bd->name, rq, bc, bc->bio, uptodate);
338 bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration);
340 spin_lock_irqsave(&bd->lock, flags);
341 list_move_tail(&bc->list, &bd->done_list);
343 spin_unlock_irqrestore(&bd->lock, flags);
345 wake_up(&bd->wq_done);
349 * do final setup of a 'bc' and submit the matching 'rq' to the block
352 static void bsg_add_command(struct bsg_device *bd, request_queue_t *q,
353 struct bsg_command *bc, struct request *rq)
355 rq->sense = bc->sense;
359 * add bc command to busy queue and submit rq for io
364 bc->bidi_bio = rq->next_rq->bio;
365 bc->hdr.duration = jiffies;
366 spin_lock_irq(&bd->lock);
367 list_add_tail(&bc->list, &bd->busy_list);
368 spin_unlock_irq(&bd->lock);
370 dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc);
372 rq->end_io_data = bc;
373 blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io);
376 static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
378 struct bsg_command *bc = NULL;
380 spin_lock_irq(&bd->lock);
382 bc = list_entry(bd->done_list.next, struct bsg_command, list);
386 spin_unlock_irq(&bd->lock);
392 * Get a finished command from the done list
394 static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd)
396 struct bsg_command *bc;
400 bc = bsg_next_done_cmd(bd);
404 if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
405 bc = ERR_PTR(-EAGAIN);
409 ret = wait_event_interruptible(bd->wq_done, bd->done_cmds);
411 bc = ERR_PTR(-ERESTARTSYS);
416 dprintk("%s: returning done %p\n", bd->name, bc);
421 static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
422 struct bio *bio, struct bio *bidi_bio)
426 dprintk("rq %p bio %p %u\n", rq, bio, rq->errors);
428 * fill in all the output members
430 hdr->device_status = status_byte(rq->errors);
431 hdr->transport_status = host_byte(rq->errors);
432 hdr->driver_status = driver_byte(rq->errors);
434 if (hdr->device_status || hdr->transport_status || hdr->driver_status)
435 hdr->info |= SG_INFO_CHECK;
436 hdr->din_resid = rq->data_len;
437 hdr->response_len = 0;
439 if (rq->sense_len && hdr->response) {
440 int len = min_t(unsigned int, hdr->max_response_len,
443 ret = copy_to_user((void*)(unsigned long)hdr->response,
446 hdr->response_len = len;
452 blk_rq_unmap_user(bidi_bio);
453 blk_put_request(rq->next_rq);
456 blk_rq_unmap_user(bio);
462 static int bsg_complete_all_commands(struct bsg_device *bd)
464 struct bsg_command *bc;
467 dprintk("%s: entered\n", bd->name);
469 set_bit(BSG_F_BLOCK, &bd->flags);
472 * wait for all commands to complete
476 ret = bsg_io_schedule(bd);
478 * look for -ENODATA specifically -- we'll sometimes get
479 * -ERESTARTSYS when we've taken a signal, but we can't
480 * return until we're done freeing the queue, so ignore
481 * it. The signal will get handled when we're done freeing
484 } while (ret != -ENODATA);
487 * discard done commands
491 spin_lock_irq(&bd->lock);
492 if (!bd->queued_cmds) {
493 spin_unlock_irq(&bd->lock);
496 spin_unlock_irq(&bd->lock);
498 bc = bsg_get_done_cmd(bd);
502 tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio,
507 bsg_free_command(bc);
514 __bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
515 const struct iovec *iov, ssize_t *bytes_read)
517 struct bsg_command *bc;
518 int nr_commands, ret;
520 if (count % sizeof(struct sg_io_v4))
524 nr_commands = count / sizeof(struct sg_io_v4);
525 while (nr_commands) {
526 bc = bsg_get_done_cmd(bd);
533 * this is the only case where we need to copy data back
534 * after completing the request. so do that here,
535 * bsg_complete_work() cannot do that for us
537 ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio,
540 if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr)))
543 bsg_free_command(bc);
548 buf += sizeof(struct sg_io_v4);
549 *bytes_read += sizeof(struct sg_io_v4);
556 static inline void bsg_set_block(struct bsg_device *bd, struct file *file)
558 if (file->f_flags & O_NONBLOCK)
559 clear_bit(BSG_F_BLOCK, &bd->flags);
561 set_bit(BSG_F_BLOCK, &bd->flags);
564 static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file)
566 if (file->f_mode & FMODE_WRITE)
567 set_bit(BSG_F_WRITE_PERM, &bd->flags);
569 clear_bit(BSG_F_WRITE_PERM, &bd->flags);
573 * Check if the error is a "real" error that we should return.
575 static inline int err_block_err(int ret)
577 if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN)
584 bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
586 struct bsg_device *bd = file->private_data;
590 dprintk("%s: read %Zd bytes\n", bd->name, count);
592 bsg_set_block(bd, file);
594 ret = __bsg_read(buf, count, bd, NULL, &bytes_read);
597 if (!bytes_read || (bytes_read && err_block_err(ret)))
603 static int __bsg_write(struct bsg_device *bd, const char __user *buf,
604 size_t count, ssize_t *bytes_written)
606 struct bsg_command *bc;
608 int ret, nr_commands;
610 if (count % sizeof(struct sg_io_v4))
613 nr_commands = count / sizeof(struct sg_io_v4);
617 while (nr_commands) {
618 request_queue_t *q = bd->queue;
620 bc = bsg_alloc_command(bd);
627 bc->uhdr = (struct sg_io_v4 __user *) buf;
628 if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) {
634 * get a request, fill in the blanks, and add to request queue
636 rq = bsg_map_hdr(bd, &bc->hdr);
643 bsg_add_command(bd, q, bc, rq);
647 buf += sizeof(struct sg_io_v4);
648 *bytes_written += sizeof(struct sg_io_v4);
652 bsg_free_command(bc);
658 bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
660 struct bsg_device *bd = file->private_data;
661 ssize_t bytes_written;
664 dprintk("%s: write %Zd bytes\n", bd->name, count);
666 bsg_set_block(bd, file);
667 bsg_set_write_perm(bd, file);
670 ret = __bsg_write(bd, buf, count, &bytes_written);
671 *ppos = bytes_written;
674 * return bytes written on non-fatal errors
676 if (!bytes_written || (bytes_written && err_block_err(ret)))
679 dprintk("%s: returning %Zd\n", bd->name, bytes_written);
680 return bytes_written;
683 static struct bsg_device *bsg_alloc_device(void)
685 struct bsg_device *bd;
687 bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL);
691 spin_lock_init(&bd->lock);
693 bd->max_queue = BSG_DEFAULT_CMDS;
695 INIT_LIST_HEAD(&bd->busy_list);
696 INIT_LIST_HEAD(&bd->done_list);
697 INIT_HLIST_NODE(&bd->dev_list);
699 init_waitqueue_head(&bd->wq_free);
700 init_waitqueue_head(&bd->wq_done);
704 static int bsg_put_device(struct bsg_device *bd)
708 mutex_lock(&bsg_mutex);
710 if (!atomic_dec_and_test(&bd->ref_count))
713 dprintk("%s: tearing down\n", bd->name);
716 * close can always block
718 set_bit(BSG_F_BLOCK, &bd->flags);
721 * correct error detection baddies here again. it's the responsibility
722 * of the app to properly reap commands before close() if it wants
723 * fool-proof error detection
725 ret = bsg_complete_all_commands(bd);
727 blk_put_queue(bd->queue);
728 hlist_del(&bd->dev_list);
731 mutex_unlock(&bsg_mutex);
735 static struct bsg_device *bsg_add_device(struct inode *inode,
736 struct request_queue *rq,
739 struct bsg_device *bd;
741 unsigned char buf[32];
744 bd = bsg_alloc_device();
746 return ERR_PTR(-ENOMEM);
749 kobject_get(&rq->kobj);
750 bsg_set_block(bd, file);
752 atomic_set(&bd->ref_count, 1);
753 bd->minor = iminor(inode);
754 mutex_lock(&bsg_mutex);
755 hlist_add_head(&bd->dev_list,
756 &bsg_device_list[bd->minor & (BSG_LIST_ARRAY_SIZE - 1)]);
758 strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1);
759 dprintk("bound to <%s>, max queue %d\n",
760 format_dev_t(buf, inode->i_rdev), bd->max_queue);
762 mutex_unlock(&bsg_mutex);
766 static struct bsg_device *__bsg_get_device(int minor)
768 struct hlist_head *list;
769 struct bsg_device *bd = NULL;
770 struct hlist_node *entry;
772 mutex_lock(&bsg_mutex);
774 list = &bsg_device_list[minor & (BSG_LIST_ARRAY_SIZE - 1)];
775 hlist_for_each(entry, list) {
776 bd = hlist_entry(entry, struct bsg_device, dev_list);
777 if (bd->minor == minor) {
778 atomic_inc(&bd->ref_count);
785 mutex_unlock(&bsg_mutex);
789 static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
791 struct bsg_device *bd = __bsg_get_device(iminor(inode));
792 struct bsg_class_device *bcd, *__bcd;
798 * find the class device
801 mutex_lock(&bsg_mutex);
802 list_for_each_entry(__bcd, &bsg_class_list, list) {
803 if (__bcd->minor == iminor(inode)) {
808 mutex_unlock(&bsg_mutex);
811 return ERR_PTR(-ENODEV);
813 return bsg_add_device(inode, bcd->queue, file);
816 static int bsg_open(struct inode *inode, struct file *file)
818 struct bsg_device *bd = bsg_get_device(inode, file);
823 file->private_data = bd;
827 static int bsg_release(struct inode *inode, struct file *file)
829 struct bsg_device *bd = file->private_data;
831 file->private_data = NULL;
832 return bsg_put_device(bd);
835 static unsigned int bsg_poll(struct file *file, poll_table *wait)
837 struct bsg_device *bd = file->private_data;
838 unsigned int mask = 0;
840 poll_wait(file, &bd->wq_done, wait);
841 poll_wait(file, &bd->wq_free, wait);
843 spin_lock_irq(&bd->lock);
844 if (!list_empty(&bd->done_list))
845 mask |= POLLIN | POLLRDNORM;
846 if (bd->queued_cmds >= bd->max_queue)
848 spin_unlock_irq(&bd->lock);
853 static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
855 struct bsg_device *bd = file->private_data;
856 int __user *uarg = (int __user *) arg;
862 case SG_GET_COMMAND_Q:
863 return put_user(bd->max_queue, uarg);
864 case SG_SET_COMMAND_Q: {
867 if (get_user(queue, uarg))
872 spin_lock_irq(&bd->lock);
873 bd->max_queue = queue;
874 spin_unlock_irq(&bd->lock);
881 case SG_GET_VERSION_NUM:
882 case SCSI_IOCTL_GET_IDLUN:
883 case SCSI_IOCTL_GET_BUS_NUMBER:
886 case SG_GET_RESERVED_SIZE:
887 case SG_SET_RESERVED_SIZE:
888 case SG_EMULATED_HOST:
889 case SCSI_IOCTL_SEND_COMMAND: {
890 void __user *uarg = (void __user *) arg;
891 return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg);
895 struct bio *bio, *bidi_bio = NULL;
898 if (copy_from_user(&hdr, uarg, sizeof(hdr)))
901 rq = bsg_map_hdr(bd, &hdr);
907 bidi_bio = rq->next_rq->bio;
908 blk_execute_rq(bd->queue, NULL, rq, 0);
909 blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
911 if (copy_to_user(uarg, &hdr, sizeof(hdr)))
917 * block device ioctls
921 return ioctl_by_bdev(bd->bdev, cmd, arg);
928 static struct file_operations bsg_fops = {
933 .release = bsg_release,
934 .unlocked_ioctl = bsg_ioctl,
935 .owner = THIS_MODULE,
938 void bsg_unregister_queue(struct request_queue *q)
940 struct bsg_class_device *bcd = &q->bsg_dev;
942 WARN_ON(!bcd->class_dev);
944 mutex_lock(&bsg_mutex);
945 sysfs_remove_link(&q->kobj, "bsg");
946 class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
947 bcd->class_dev = NULL;
948 list_del_init(&bcd->list);
950 mutex_unlock(&bsg_mutex);
952 EXPORT_SYMBOL_GPL(bsg_unregister_queue);
954 int bsg_register_queue(struct request_queue *q, const char *name)
956 struct bsg_class_device *bcd, *__bcd;
959 struct class_device *class_dev = NULL;
962 * we need a proper transport to send commands, not a stacked device
968 memset(bcd, 0, sizeof(*bcd));
969 INIT_LIST_HEAD(&bcd->list);
971 mutex_lock(&bsg_mutex);
972 if (bsg_device_nr == BSG_MAX_DEVS) {
973 printk(KERN_ERR "bsg: too many bsg devices\n");
978 list_for_each_entry(__bcd, &bsg_class_list, list) {
979 if (__bcd->minor == bsg_minor_idx) {
981 if (bsg_minor_idx == BSG_MAX_DEVS)
987 bcd->minor = bsg_minor_idx++;
988 if (bsg_minor_idx == BSG_MAX_DEVS)
992 dev = MKDEV(BSG_MAJOR, bcd->minor);
993 class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name);
994 if (IS_ERR(class_dev)) {
995 ret = PTR_ERR(class_dev);
998 bcd->class_dev = class_dev;
1001 ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
1006 list_add_tail(&bcd->list, &bsg_class_list);
1009 mutex_unlock(&bsg_mutex);
1013 class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
1014 mutex_unlock(&bsg_mutex);
1017 EXPORT_SYMBOL_GPL(bsg_register_queue);
1019 static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
1022 struct scsi_device *sdp = to_scsi_device(cl_dev->dev);
1023 struct request_queue *rq = sdp->request_queue;
1025 if (rq->kobj.parent)
1026 ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent));
1028 ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj));
1032 static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1034 bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue);
1037 static struct class_interface bsg_intf = {
1039 .remove = bsg_remove,
1042 static struct cdev bsg_cdev = {
1043 .kobj = {.name = "bsg", },
1044 .owner = THIS_MODULE,
1047 static int __init bsg_init(void)
1051 bsg_cmd_cachep = kmem_cache_create("bsg_cmd",
1052 sizeof(struct bsg_command), 0, 0, NULL, NULL);
1053 if (!bsg_cmd_cachep) {
1054 printk(KERN_ERR "bsg: failed creating slab cache\n");
1058 for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++)
1059 INIT_HLIST_HEAD(&bsg_device_list[i]);
1061 bsg_class = class_create(THIS_MODULE, "bsg");
1062 if (IS_ERR(bsg_class)) {
1063 kmem_cache_destroy(bsg_cmd_cachep);
1064 return PTR_ERR(bsg_class);
1067 ret = register_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS, "bsg");
1069 kmem_cache_destroy(bsg_cmd_cachep);
1070 class_destroy(bsg_class);
1074 cdev_init(&bsg_cdev, &bsg_fops);
1075 ret = cdev_add(&bsg_cdev, MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
1077 kmem_cache_destroy(bsg_cmd_cachep);
1078 class_destroy(bsg_class);
1079 unregister_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
1083 ret = scsi_register_interface(&bsg_intf);
1085 printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
1086 kmem_cache_destroy(bsg_cmd_cachep);
1087 class_destroy(bsg_class);
1088 unregister_chrdev(BSG_MAJOR, "bsg");
1092 printk(KERN_INFO "%s loaded\n", bsg_version);
1096 MODULE_AUTHOR("Jens Axboe");
1097 MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver");
1098 MODULE_LICENSE("GPL");
1100 device_initcall(bsg_init);