Merge tag 'block-5.14-2021-07-08' of git://git.kernel.dk/linux-block

Pull more block updates from Jens Axboe:
 "A combination of changes that ended up depending on both the driver
  and core branch (and/or the IDE removal), and a few late arriving
  fixes. In detail:

   - Fix io ticks wrap-around issue (Chunguang)

   - nvme-tcp sock locking fix (Maurizio)

   - s390-dasd fixes (Kees, Christoph)

   - blk_execute_rq polling support (Keith)

   - blk-cgroup RCU iteration fix (Yu)

   - nbd backend ID addition (Prasanna)

   - Partition deletion fix (Yufen)

   - Use blk_mq_alloc_disk for mmc, mtip32xx, ubd (Christoph)

   - Removal of now dead block request types due to IDE removal
     (Christoph)

   - Loop probing and control device cleanups (Christoph)

   - Device uevent fix (Christoph)

   - Misc cleanups/fixes (Tetsuo, Christoph)"

* tag 'block-5.14-2021-07-08' of git://git.kernel.dk/linux-block: (34 commits)
  blk-cgroup: prevent rcu_sched detected stalls warnings while iterating blkgs
  block: fix the problem of io_ticks becoming smaller
  nvme-tcp: can't set sk_user_data without write_lock
  loop: remove unused variable in loop_set_status()
  block: remove the bdgrab in blk_drop_partitions
  block: grab a device refcount in disk_uevent
  s390/dasd: Avoid field over-reading memcpy()
  dasd: unexport dasd_set_target_state
  block: check disk exist before trying to add partition
  ubd: remove dead code in ubd_setup_common
  nvme: use return value from blk_execute_rq()
  block: return errors from blk_execute_rq()
  nvme: use blk_execute_rq() for passthrough commands
  block: support polling through blk_execute_rq
  block: remove REQ_OP_SCSI_{IN,OUT}
  block: mark blk_mq_init_queue_data static
  loop: rewrite loop_exit using idr_for_each_entry
  loop: split loop_lookup
  loop: don't allow deleting an unspecified loop device
  loop: move loop_ctl_mutex locking into loop_add
  ...

1 files changed, 26 insertions, 134 deletions

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index cbd4f00fe77e..e497185dd393 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)
@@ -280,36 +243,14 @@ 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;
-		}
-
-		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);
@@ -874,7 +815,6 @@ 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);
 }
@@ -914,41 +854,25 @@ 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 device *parent = NULL;
-	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);
-	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);
-
-	*disk_out = disk;
-	return 0;
+	device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
 }
 
 #define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
@@ -960,6 +884,7 @@ 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)
@@ -984,43 +909,24 @@ 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;
-	}
-
-	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;
+	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)
@@ -1123,13 +1029,7 @@ static int ubd_remove(int n, char **error_out)
 	ubd_gendisk[n] = NULL;
 	if(disk != NULL){
 		del_gendisk(disk);
-		put_disk(disk);
-	}
-
-	if(fake_gendisk[n] != NULL){
-		del_gendisk(fake_gendisk[n]);
-		put_disk(fake_gendisk[n]);
-		fake_gendisk[n] = NULL;
+		blk_cleanup_disk(disk);
 	}
 
 	err = 0;
@@ -1188,14 +1088,6 @@ 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