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authorChristoph Hellwig <hch@lst.de>2021-05-25 08:13:00 +0200
committerJens Axboe <axboe@kernel.dk>2021-06-01 07:45:49 -0600
commitc97d93c31e5734a16bfe663085ec91b8c9fb20f9 (patch)
treefdac112a1884242e87aa576e5f01675fc969a530 /block/genhd.c
parentab4b57057d744861f670b47b163209727b26418b (diff)
block: factor out a part_devt helper
Add a helper to find the dev_t for a disk + partno tuple. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20210525061301.2242282-8-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 38d136a19484..3f7b1c92c7f3 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1227,6 +1227,19 @@ static int __init proc_genhd_init(void)
module_init(proc_genhd_init);
#endif /* CONFIG_PROC_FS */
+dev_t part_devt(struct gendisk *disk, u8 partno)
+{
+ struct block_device *part = bdget_disk(disk, partno);
+ dev_t devt = 0;
+
+ if (part) {
+ devt = part->bd_dev;
+ bdput(part);
+ }
+
+ return devt;
+}
+
dev_t blk_lookup_devt(const char *name, int partno)
{
dev_t devt = MKDEV(0, 0);
@@ -1236,7 +1249,6 @@ dev_t blk_lookup_devt(const char *name, int partno)
class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
- struct block_device *part;
if (strcmp(dev_name(dev), name))
continue;
@@ -1247,13 +1259,10 @@ dev_t blk_lookup_devt(const char *name, int partno)
*/
devt = MKDEV(MAJOR(dev->devt),
MINOR(dev->devt) + partno);
- break;
- }
- part = bdget_disk(disk, partno);
- if (part) {
- devt = part->bd_dev;
- bdput(part);
- break;
+ } else {
+ devt = part_devt(disk, partno);
+ if (devt)
+ break;
}
}
class_dev_iter_exit(&iter);