From 7eb90f7e90a85b635b31bc0ac35846880c7470e7 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 14 Jun 2021 08:07:58 +0200 Subject: ubd: remove the code to register as the legacy IDE driver 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 Acked-By: Anton Ivanov Link: https://lore.kernel.org/r/20210614060759.3965724-2-hch@lst.de Signed-off-by: Jens Axboe --- arch/um/drivers/ubd_kern.c | 106 +++++---------------------------------------- 1 file changed, 12 insertions(+), 94 deletions(-) (limited to 'arch') diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 8e0b43cf089f..f508d45f7a69 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -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; - } + sprintf(disk->disk_name, "ubd%c", 'a' + unit); + + 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); 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 -- cgit v1.2.3 From 35efb594c3a8bbd41fca67658b03bf99441d488b Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 14 Jun 2021 08:07:59 +0200 Subject: ubd: use blk_mq_alloc_disk and blk_cleanup_disk Use blk_mq_alloc_disk and blk_cleanup_disk to simplify the gendisk and request_queue allocation. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210614060759.3965724-3-hch@lst.de Signed-off-by: Jens Axboe --- arch/um/drivers/ubd_kern.c | 44 ++++++++++++++------------------------------ 1 file changed, 14 insertions(+), 30 deletions(-) (limited to 'arch') diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index f508d45f7a69..0b86aa1b12f1 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -825,7 +825,6 @@ static void ubd_device_release(struct device *dev) { struct ubd *ubd_dev = dev_get_drvdata(dev); - blk_cleanup_queue(ubd_dev->queue); blk_mq_free_tag_set(&ubd_dev->tag_set); *ubd_dev = ((struct ubd) DEFAULT_UBD); } @@ -865,17 +864,12 @@ static const struct attribute_group *ubd_attr_groups[] = { NULL, }; -static int ubd_disk_register(int major, u64 size, int unit, - struct gendisk **disk_out) +static void ubd_disk_register(int major, u64 size, int unit, + struct gendisk *disk) { - struct gendisk *disk; - - disk = alloc_disk(1 << UBD_SHIFT); - if(disk == NULL) - return -ENOMEM; - disk->major = major; disk->first_minor = unit << UBD_SHIFT; + disk->minors = 1 << UBD_SHIFT; disk->fops = &ubd_blops; set_capacity(disk, size / 512); sprintf(disk->disk_name, "ubd%c", 'a' + unit); @@ -889,9 +883,6 @@ static int ubd_disk_register(int major, u64 size, int unit, disk->private_data = &ubd_devs[unit]; disk->queue = ubd_devs[unit].queue; device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups); - - *disk_out = disk; - return 0; } #define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE)) @@ -903,6 +894,7 @@ static const struct blk_mq_ops ubd_mq_ops = { static int ubd_add(int n, char **error_out) { struct ubd *ubd_dev = &ubd_devs[n]; + struct gendisk *disk; int err = 0; if(ubd_dev->file == NULL) @@ -927,32 +919,24 @@ static int ubd_add(int n, char **error_out) if (err) goto out; - ubd_dev->queue = blk_mq_init_queue(&ubd_dev->tag_set); - if (IS_ERR(ubd_dev->queue)) { - err = PTR_ERR(ubd_dev->queue); + disk = blk_mq_alloc_disk(&ubd_dev->tag_set, ubd_dev); + if (IS_ERR(disk)) { + err = PTR_ERR(disk); goto out_cleanup_tags; } + ubd_dev->queue = disk->queue; - ubd_dev->queue->queuedata = ubd_dev; blk_queue_write_cache(ubd_dev->queue, true, false); - blk_queue_max_segments(ubd_dev->queue, MAX_SG); blk_queue_segment_boundary(ubd_dev->queue, PAGE_SIZE - 1); - err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]); - if(err){ - *error_out = "Failed to register device"; - goto out_cleanup_tags; - } - - err = 0; -out: - return err; + ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk); + ubd_gendisk[n] = disk; + return 0; out_cleanup_tags: blk_mq_free_tag_set(&ubd_dev->tag_set); - if (!(IS_ERR(ubd_dev->queue))) - blk_cleanup_queue(ubd_dev->queue); - goto out; +out: + return err; } static int ubd_config(char *str, char **error_out) @@ -1055,7 +1039,7 @@ static int ubd_remove(int n, char **error_out) ubd_gendisk[n] = NULL; if(disk != NULL){ del_gendisk(disk); - put_disk(disk); + blk_cleanup_disk(disk); } err = 0; -- cgit v1.2.3 From efee99e68e69d8a1966f3d426cc0cea73e32c6d7 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 28 Jun 2021 11:39:37 +0200 Subject: ubd: remove dead code in ubd_setup_common Remove some leftovers of the fake major number parsing that cause complains from some compilers. Fixes: 2933a1b2c6f3 ("ubd: remove the code to register as the legacy IDE driver") Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210628093937.1325608-1-hch@lst.de Signed-off-by: Jens Axboe --- arch/um/drivers/ubd_kern.c | 10 ---------- 1 file changed, 10 deletions(-) (limited to 'arch') diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 0b86aa1b12f1..e3093071406d 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -243,22 +243,12 @@ static int ubd_setup_common(char *str, int *index_out, char **error_out) if(index_out) *index_out = -1; n = *str; if(n == '='){ - char *end; - int major; - str++; if(!strcmp(str, "sync")){ global_openflags = of_sync(global_openflags); return err; } - err = -EINVAL; - major = simple_strtoul(str, &end, 0); - if((*end != '\0') || (end == str)){ - *error_out = "Didn't parse major number"; - return err; - } - pr_warn("fake major not supported any more\n"); return 0; } -- cgit v1.2.3