Merge tag 'block-5.5-2020-01-26' of git://git.kernel.dk/linux-block

Pull block fix from Jens Axboe:
 "Unfortunately this weekend we had a few last minute reports, one was
  for block.

  The partition disable for zoned devices was overly restrictive, it can
  work (and be supported) just fine for host-aware variants.

  Here's a fix ensuring that's the case so we don't break existing users
  of that"

* tag 'block-5.5-2020-01-26' of git://git.kernel.dk/linux-block:
  block: allow partitions on host aware zone devices

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 8bb63027e4d6..ea4c133b4139 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -245,6 +245,18 @@ static inline bool disk_part_scan_enabled(struct gendisk *disk)
 		!(disk->flags & GENHD_FL_NO_PART_SCAN);
 }
 
+static inline bool disk_has_partitions(struct gendisk *disk)
+{
+	bool ret = false;
+
+	rcu_read_lock();
+	if (rcu_dereference(disk->part_tbl)->len > 1)
+		ret = true;
+	rcu_read_unlock();
+
+	return ret;
+}
+
 static inline dev_t disk_devt(struct gendisk *disk)
 {
 	return MKDEV(disk->major, disk->first_minor);