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authorShin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>2020-02-21 10:37:08 +0900
committerJens Axboe <axboe@kernel.dk>2020-03-12 07:54:39 -0600
commitb53df2e7442c73a932fb74228147fb946e531585 (patch)
treebfe985113e15690714d8d099f454c5dc06c91a18 /block/genhd.c
parentcc3200eac4c5eb11c3f34848a014d1f286316310 (diff)
downloadlinux-b53df2e7442c73a932fb74228147fb946e531585.tar.bz2
block: Fix partition support for host aware zoned block devices
Commit b72053072c0b ("block: allow partitions on host aware zone devices") introduced the helper function disk_has_partitions() to check if a given disk has valid partitions. However, since this function result directly depends on the disk partition table length rather than the actual existence of valid partitions in the table, it returns true even after all partitions are removed from the disk. For host aware zoned block devices, this results in zone management support to be kept disabled even after removing all partitions. Fix this by changing disk_has_partitions() to walk through the partition table entries and return true if and only if a valid non-zero size partition is found. Fixes: b72053072c0b ("block: allow partitions on host aware zone devices") Cc: stable@vger.kernel.org # 5.5 Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c
index ff6268970ddc..9c2e13ce0d19 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -301,6 +301,42 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector)
}
EXPORT_SYMBOL_GPL(disk_map_sector_rcu);
+/**
+ * disk_has_partitions
+ * @disk: gendisk of interest
+ *
+ * Walk through the partition table and check if valid partition exists.
+ *
+ * CONTEXT:
+ * Don't care.
+ *
+ * RETURNS:
+ * True if the gendisk has at least one valid non-zero size partition.
+ * Otherwise false.
+ */
+bool disk_has_partitions(struct gendisk *disk)
+{
+ struct disk_part_tbl *ptbl;
+ int i;
+ bool ret = false;
+
+ rcu_read_lock();
+ ptbl = rcu_dereference(disk->part_tbl);
+
+ /* Iterate partitions skipping the whole device at index 0 */
+ for (i = 1; i < ptbl->len; i++) {
+ if (rcu_dereference(ptbl->part[i])) {
+ ret = true;
+ break;
+ }
+ }
+
+ rcu_read_unlock();
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(disk_has_partitions);
+
/*
* Can be deleted altogether. Later.
*