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authorChristoph Hellwig <hch@lst.de>2021-05-21 07:50:55 +0200
committerJens Axboe <axboe@kernel.dk>2021-06-01 07:42:23 -0600
commitf525464a8000f092c20b00eead3eaa9d849c599e (patch)
tree6a05793a03d8cf7c52635e886f73203633329cbe /block/genhd.c
parent958229a7c55f219b1cff99f939dabbc1b6ba7161 (diff)
block: add blk_alloc_disk and blk_cleanup_disk APIs
Add two new APIs to allocate and free a gendisk including the request_queue for use with BIO based drivers. This is to avoid boilerplate code in drivers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Link: https://lore.kernel.org/r/20210521055116.1053587-6-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c
index c826db33a73e..efe0db4d62f0 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1293,6 +1293,25 @@ out_free_disk:
}
EXPORT_SYMBOL(__alloc_disk_node);
+struct gendisk *__blk_alloc_disk(int node)
+{
+ struct request_queue *q;
+ struct gendisk *disk;
+
+ q = blk_alloc_queue(node);
+ if (!q)
+ return NULL;
+
+ disk = __alloc_disk_node(0, node);
+ if (!disk) {
+ blk_cleanup_queue(q);
+ return NULL;
+ }
+ disk->queue = q;
+ return disk;
+}
+EXPORT_SYMBOL(__blk_alloc_disk);
+
/**
* put_disk - decrements the gendisk refcount
* @disk: the struct gendisk to decrement the refcount for
@@ -1310,6 +1329,22 @@ void put_disk(struct gendisk *disk)
}
EXPORT_SYMBOL(put_disk);
+/**
+ * blk_cleanup_disk - shutdown a gendisk allocated by blk_alloc_disk
+ * @disk: gendisk to shutdown
+ *
+ * Mark the queue hanging off @disk DYING, drain all pending requests, then mark
+ * the queue DEAD, destroy and put it and the gendisk structure.
+ *
+ * Context: can sleep
+ */
+void blk_cleanup_disk(struct gendisk *disk)
+{
+ blk_cleanup_queue(disk->queue);
+ put_disk(disk);
+}
+EXPORT_SYMBOL(blk_cleanup_disk);
+
static void set_disk_ro_uevent(struct gendisk *gd, int ro)
{
char event[] = "DISK_RO=1";