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ubd: remove the code to register as the legacy IDE driver

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With the legacy IDE driver long deprecated, and modern userspace being
much more flexible about dev_t assignments there is no reason to fake
a registration as the legacy IDE driver in ubd.  This registeration
is a little problematic as it registers the same request_queue for
multiple gendisks, so just remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Link: https://lore.kernel.org/r/20210614060759.3965724-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-06-14 08:07:58 +02:00 committed by Jens Axboe
parent 2f43dbf3a7
commit 7eb90f7e90
1 changed files with 11 additions and 93 deletions
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92
arch/um/drivers/ubd_kern.c
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@ -125,9 +125,7 @@ static const struct block_device_operations ubd_blops = {
};
/* Protected by ubd_lock */
static int fake_major = UBD_MAJOR;
static struct gendisk *ubd_gendisk[MAX_DEV];
static struct gendisk *fake_gendisk[MAX_DEV];
#ifdef CONFIG_BLK_DEV_UBD_SYNC
#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \
@ -197,54 +195,19 @@ struct ubd {
/* Protected by ubd_lock */
static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD };
/* Only changed by fake_ide_setup which is a setup */
static int fake_ide = 0;
static struct proc_dir_entry *proc_ide_root = NULL;
static struct proc_dir_entry *proc_ide = NULL;
static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd);
static void make_proc_ide(void)
{
proc_ide_root = proc_mkdir("ide", NULL);
proc_ide = proc_mkdir("ide0", proc_ide_root);
}
static int fake_ide_media_proc_show(struct seq_file *m, void *v)
{
seq_puts(m, "disk\n");
return 0;
}
static void make_ide_entries(const char *dev_name)
{
struct proc_dir_entry *dir, *ent;
char name[64];
if(proc_ide_root == NULL) make_proc_ide();
dir = proc_mkdir(dev_name, proc_ide);
if(!dir) return;
ent = proc_create_single("media", S_IRUGO, dir,
fake_ide_media_proc_show);
if(!ent) return;
snprintf(name, sizeof(name), "ide0/%s", dev_name);
proc_symlink(dev_name, proc_ide_root, name);
}
static int fake_ide_setup(char *str)
{
fake_ide = 1;
pr_warn("The fake_ide option has been removed\n");
return 1;
}
__setup("fake_ide", fake_ide_setup);
__uml_help(fake_ide_setup,
"fake_ide\n"
" Create ide0 entries that map onto ubd devices.\n\n"
" Obsolete stub.\n\n"
);
static int parse_unit(char **ptr)
@ -296,20 +259,8 @@ static int ubd_setup_common(char *str, int *index_out, char **error_out)
return err;
}
mutex_lock(&ubd_lock);
if (fake_major != UBD_MAJOR) {
*error_out = "Can't assign a fake major twice";
goto out1;
}
fake_major = major;
printk(KERN_INFO "Setting extra ubd major number to %d\n",
major);
err = 0;
out1:
mutex_unlock(&ubd_lock);
return err;
pr_warn("fake major not supported any more\n");
return 0;
}
n = parse_unit(&str);
@ -917,7 +868,6 @@ static const struct attribute_group *ubd_attr_groups[] = {
static int ubd_disk_register(int major, u64 size, int unit,
struct gendisk **disk_out)
{
struct device *parent = NULL;
struct gendisk *disk;
disk = alloc_disk(1 << UBD_SHIFT);
@ -928,24 +878,17 @@ static int ubd_disk_register(int major, u64 size, int unit,
disk->first_minor = unit << UBD_SHIFT;
disk->fops = &ubd_blops;
set_capacity(disk, size / 512);
if (major == UBD_MAJOR)
sprintf(disk->disk_name, "ubd%c", 'a' + unit);
else
sprintf(disk->disk_name, "ubd_fake%d", unit);
/* sysfs register (not for ide fake devices) */
if (major == UBD_MAJOR) {
ubd_devs[unit].pdev.id = unit;
ubd_devs[unit].pdev.name = DRIVER_NAME;
ubd_devs[unit].pdev.dev.release = ubd_device_release;
dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]);
platform_device_register(&ubd_devs[unit].pdev);
parent = &ubd_devs[unit].pdev.dev;
}
disk->private_data = &ubd_devs[unit];
disk->queue = ubd_devs[unit].queue;
device_add_disk(parent, disk, ubd_attr_groups);
device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
*disk_out = disk;
return 0;
@ -1001,17 +944,6 @@ static int ubd_add(int n, char **error_out)
goto out_cleanup_tags;
}
if (fake_major != UBD_MAJOR)
ubd_disk_register(fake_major, ubd_dev->size, n,
&fake_gendisk[n]);
/*
* Perhaps this should also be under the "if (fake_major)" above
* using the fake_disk->disk_name
*/
if (fake_ide)
make_ide_entries(ubd_gendisk[n]->disk_name);
err = 0;
out:
return err;
@ -1126,12 +1058,6 @@ static int ubd_remove(int n, char **error_out)
put_disk(disk);
}
if(fake_gendisk[n] != NULL){
del_gendisk(fake_gendisk[n]);
put_disk(fake_gendisk[n]);
fake_gendisk[n] = NULL;
}
err = 0;
platform_device_unregister(&ubd_dev->pdev);
out:
@ -1188,14 +1114,6 @@ static int __init ubd_init(void)
if (register_blkdev(UBD_MAJOR, "ubd"))
return -1;
if (fake_major != UBD_MAJOR) {
char name[sizeof("ubd_nnn\0")];
snprintf(name, sizeof(name), "ubd_%d", fake_major);
if (register_blkdev(fake_major, "ubd"))
return -1;
}
irq_req_buffer = kmalloc_array(UBD_REQ_BUFFER_SIZE,
sizeof(struct io_thread_req *),
GFP_KERNEL