diff options
author | Dave Airlie <airlied@redhat.com> | 2020-03-31 15:15:47 +1000 |
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committer | Dave Airlie <airlied@redhat.com> | 2020-03-31 15:15:47 +1000 |
commit | 5fc0df93fccd4dc8412bfc488ba4ba8268aa12dc (patch) | |
tree | 6091ced63dbba747619762470ebba2298676ea0d /block/genhd.c | |
parent | 700d6ab987f3b5e28b13b5993e5a9a975c5604e2 (diff) | |
parent | 7111951b8d4973bda27ff663f2cf18b663d15b48 (diff) |
Merge v5.6 into drm-next
msm needed rc6, so I just went and merged release
(msm has been in drm-next outside of this tree)
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'block/genhd.c')
-rw-r--r-- | block/genhd.c | 36 |
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. * |