bind bsg to all SCSI devices
This patch binds bsg to all SCSI devices (their request queues) like
the current sg driver does. We can send SCSI commands to non disk and
cdrom scsi devices like OSD via bsg.
This patch removes bsg_register_queue from blk_register_queue so bsg
devices aren't bound to non SCSI block devices. If they want bsg, I'll
send a patch to do that.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/bsg.c b/block/bsg.c
index 4ea4bed..cd0221c 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -29,6 +29,8 @@
#include <scsi/scsi.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
#include <scsi/sg.h>
static char bsg_version[] = "block layer sg (bsg) 0.4";
@@ -962,6 +964,8 @@
{
struct bsg_class_device *bcd;
dev_t dev;
+ int ret;
+ struct class_device *class_dev = NULL;
/*
* we need a proper transport to send commands, not a stacked device
@@ -978,22 +982,54 @@
bcd->minor = bsg_device_nr;
bsg_device_nr++;
bcd->queue = q;
- bcd->class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name);
- if (!bcd->class_dev)
+ class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name);
+ if (IS_ERR(class_dev)) {
+ ret = PTR_ERR(class_dev);
goto err;
+ }
+ bcd->class_dev = class_dev;
+
+ if (q->kobj.dentry) {
+ ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
+ if (ret)
+ goto err;
+ }
+
list_add_tail(&bcd->list, &bsg_class_list);
- if (sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"))
- goto err;
+
mutex_unlock(&bsg_mutex);
return 0;
err:
bsg_device_nr--;
- if (bcd->class_dev)
+ if (class_dev)
class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
mutex_unlock(&bsg_mutex);
- return -ENOMEM;
+ return ret;
}
+static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
+{
+ int ret;
+ struct scsi_device *sdp = to_scsi_device(cl_dev->dev);
+ struct request_queue *rq = sdp->request_queue;
+
+ if (rq->kobj.parent)
+ ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent));
+ else
+ ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj));
+ return ret;
+}
+
+static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
+{
+ bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue);
+}
+
+static struct class_interface bsg_intf = {
+ .add = bsg_add,
+ .remove = bsg_remove,
+};
+
static int __init bsg_init(void)
{
int ret, i;
@@ -1021,6 +1057,15 @@
return ret;
}
+ ret = scsi_register_interface(&bsg_intf);
+ if (ret) {
+ printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
+ kmem_cache_destroy(bsg_cmd_cachep);
+ class_destroy(bsg_class);
+ unregister_chrdev(BSG_MAJOR, "bsg");
+ return ret;
+ }
+
printk(KERN_INFO "%s loaded\n", bsg_version);
return 0;
}
@@ -1029,4 +1074,4 @@
MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver");
MODULE_LICENSE("GPL");
-subsys_initcall(bsg_init);
+device_initcall(bsg_init);
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 74a5498..ef42bb2 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -4091,13 +4091,6 @@
return ret;
}
- ret = bsg_register_queue(q, disk->disk_name);
- if (ret) {
- elv_unregister_queue(q);
- kobject_unregister(&q->kobj);
- return ret;
- }
-
return 0;
}
@@ -4106,7 +4099,6 @@
request_queue_t *q = disk->queue;
if (q && q->request_fn) {
- bsg_unregister_queue(q);
elv_unregister_queue(q);
kobject_uevent(&q->kobj, KOBJ_REMOVE);