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-rw-r--r--block/partition-generic.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/block/partition-generic.c b/block/partition-generic.c
index 71d9ed9df8da..d7beb6bbbf66 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -430,6 +430,56 @@ static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
return 0;
}
+static bool part_zone_aligned(struct gendisk *disk,
+ struct block_device *bdev,
+ sector_t from, sector_t size)
+{
+ unsigned int zone_size = bdev_zone_size(bdev);
+
+ /*
+ * If this function is called, then the disk is a zoned block device
+ * (host-aware or host-managed). This can be detected even if the
+ * zoned block device support is disabled (CONFIG_BLK_DEV_ZONED not
+ * set). In this case, however, only host-aware devices will be seen
+ * as a block device is not created for host-managed devices. Without
+ * zoned block device support, host-aware drives can still be used as
+ * regular block devices (no zone operation) and their zone size will
+ * be reported as 0. Allow this case.
+ */
+ if (!zone_size)
+ return true;
+
+ /*
+ * Check partition start and size alignement. If the drive has a
+ * smaller last runt zone, ignore it and allow the partition to
+ * use it. Check the zone size too: it should be a power of 2 number
+ * of sectors.
+ */
+ if (WARN_ON_ONCE(!is_power_of_2(zone_size))) {
+ u32 rem;
+
+ div_u64_rem(from, zone_size, &rem);
+ if (rem)
+ return false;
+ if ((from + size) < get_capacity(disk)) {
+ div_u64_rem(size, zone_size, &rem);
+ if (rem)
+ return false;
+ }
+
+ } else {
+
+ if (from & (zone_size - 1))
+ return false;
+ if ((from + size) < get_capacity(disk) &&
+ (size & (zone_size - 1)))
+ return false;
+
+ }
+
+ return true;
+}
+
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
{
struct parsed_partitions *state = NULL;
@@ -529,6 +579,21 @@ rescan:
}
}
+ /*
+ * On a zoned block device, partitions should be aligned on the
+ * device zone size (i.e. zone boundary crossing not allowed).
+ * Otherwise, resetting the write pointer of the last zone of
+ * one partition may impact the following partition.
+ */
+ if (bdev_is_zoned(bdev) &&
+ !part_zone_aligned(disk, bdev, from, size)) {
+ printk(KERN_WARNING
+ "%s: p%d start %llu+%llu is not zone aligned\n",
+ disk->disk_name, p, (unsigned long long) from,
+ (unsigned long long) size);
+ continue;
+ }
+
part = add_partition(disk, p, from, size,
state->parts[p].flags,
&state->parts[p].info);