Merge tag 'block-6.8-2024-01-26' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:

 - RCU warning fix for md (Mikulas)

 - Fix for an aoe issue that lockdep rightfully complained about
   (Maksim)

 - Fix for an error code change in partitioning that caused a regression
   with some tools (Li)

 - Fix for a data direction warning with bi-direction commands
   (Christian)

* tag 'block-6.8-2024-01-26' of git://git.kernel.dk/linux:
  md: fix a suspicious RCU usage warning
  aoe: avoid potential deadlock at set_capacity
  block: Fix WARNING in _copy_from_iter
  block: Move checking GENHD_FL_NO_PART to bdev_add_partition()

Author: torvalds

block/blk-map.c

@@ -205,12 +205,19 @@ static int bio_copy_user_iov(struct request *rq, struct rq_map_data *map_data,
 	/*
 	 * success
 	 */
-	if ((iov_iter_rw(iter) == WRITE &&
-	     (!map_data || !map_data->null_mapped)) ||
-	    (map_data && map_data->from_user)) {
+	if (iov_iter_rw(iter) == WRITE &&
+	     (!map_data || !map_data->null_mapped)) {
 		ret = bio_copy_from_iter(bio, iter);
 		if (ret)
 			goto cleanup;
+	} else if (map_data && map_data->from_user) {
+		struct iov_iter iter2 = *iter;
+
+		/* This is the copy-in part of SG_DXFER_TO_FROM_DEV. */
+		iter2.data_source = ITER_SOURCE;
+		ret = bio_copy_from_iter(bio, &iter2);
+		if (ret)
+			goto cleanup;
 	} else {
 		if (bmd->is_our_pages)
 			zero_fill_bio(bio);

block/ioctl.c

@@ -20,8 +20,6 @@ static int blkpg_do_ioctl(struct block_device *bdev,
 	struct blkpg_partition p;
 	sector_t start, length;
 
-	if (disk->flags & GENHD_FL_NO_PART)
-		return -EINVAL;
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 	if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))

block/partitions/core.c

@@ -439,6 +439,11 @@ int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
 		goto out;
 	}
 
+	if (disk->flags & GENHD_FL_NO_PART) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	if (partition_overlaps(disk, start, length, -1)) {
 		ret = -EBUSY;
 		goto out;

drivers/block/aoe/aoeblk.c

@@ -333,6 +333,7 @@ aoeblk_gdalloc(void *vp)
 	struct gendisk *gd;
 	mempool_t *mp;
 	struct blk_mq_tag_set *set;
+	sector_t ssize;
 	ulong flags;
 	int late = 0;
 	int err;
@@ -396,7 +397,7 @@ aoeblk_gdalloc(void *vp)
 	gd->minors = AOE_PARTITIONS;
 	gd->fops = &aoe_bdops;
 	gd->private_data = d;
-	set_capacity(gd, d->ssize);
+	ssize = d->ssize;
 	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
 		d->aoemajor, d->aoeminor);
 
@@ -405,6 +406,8 @@ aoeblk_gdalloc(void *vp)
 
 	spin_unlock_irqrestore(&d->lock, flags);
 
+	set_capacity(gd, ssize);
+
 	err = device_add_disk(NULL, gd, aoe_attr_groups);
 	if (err)
 		goto out_disk_cleanup;

drivers/md/raid1.c

@@ -2262,7 +2262,7 @@ static void fix_read_error(struct r1conf *conf, struct r1bio *r1_bio)
 	int sectors = r1_bio->sectors;
 	int read_disk = r1_bio->read_disk;
 	struct mddev *mddev = conf->mddev;
-	struct md_rdev *rdev = rcu_dereference(conf->mirrors[read_disk].rdev);
+	struct md_rdev *rdev = conf->mirrors[read_disk].rdev;
 
 	if (exceed_read_errors(mddev, rdev)) {
 		r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED;