From b72053072c0bbe9f1cdfe2ffa3c201c185da2201 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 26 Jan 2020 14:05:43 +0100 Subject: block: allow partitions on host aware zone devices Host-aware SMR drives can be used with the commands to explicitly manage zone state, but they can also be used as normal disks. In the former case it makes perfect sense to allow partitions on them, in the latter it does not, just like for host managed devices. Add a check to add_partition to allow partitions on host aware devices, but give up any zone management capabilities in that case, which also catches the previously missed case of adding a partition vs just scanning it. Because sd can rescan the attribute at runtime it needs to check if a disk has partitions, for which a new helper is added to genhd.h. Fixes: 5eac3eb30c9a ("block: Remove partition support for zoned block devices") Reported-by: Borislav Petkov Signed-off-by: Christoph Hellwig Tested-by: Damien Le Moal Reviewed-by: Damien Le Moal Signed-off-by: Jens Axboe --- block/partition-generic.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) (limited to 'block') diff --git a/block/partition-generic.c b/block/partition-generic.c index 1d20c9cf213f..564fae77711d 100644 --- a/block/partition-generic.c +++ b/block/partition-generic.c @@ -321,6 +321,24 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno, const char *dname; int err; + /* + * Partitions are not supported on zoned block devices that are used as + * such. + */ + switch (disk->queue->limits.zoned) { + case BLK_ZONED_HM: + pr_warn("%s: partitions not supported on host managed zoned block device\n", + disk->disk_name); + return ERR_PTR(-ENXIO); + case BLK_ZONED_HA: + pr_info("%s: disabling host aware zoned block device support due to partitions\n", + disk->disk_name); + disk->queue->limits.zoned = BLK_ZONED_NONE; + break; + case BLK_ZONED_NONE: + break; + } + err = disk_expand_part_tbl(disk, partno); if (err) return ERR_PTR(err); @@ -501,7 +519,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev, part = add_partition(disk, p, from, size, state->parts[p].flags, &state->parts[p].info); - if (IS_ERR(part)) { + if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) { printk(KERN_ERR " %s: p%d could not be added: %ld\n", disk->disk_name, p, -PTR_ERR(part)); return true; @@ -540,10 +558,10 @@ int blk_add_partitions(struct gendisk *disk, struct block_device *bdev) } /* - * Partitions are not supported on zoned block devices. + * Partitions are not supported on host managed zoned block devices. */ - if (bdev_is_zoned(bdev)) { - pr_warn("%s: ignoring partition table on zoned block device\n", + if (disk->queue->limits.zoned == BLK_ZONED_HM) { + pr_warn("%s: ignoring partition table on host managed zoned block device\n", disk->disk_name); ret = 0; goto out_free_state; -- cgit v1.2.3-58-ga151