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author | Christoph Hellwig <hch@lst.de> | 2021-05-21 07:50:55 +0200 |
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committer | Jens Axboe <axboe@kernel.dk> | 2021-06-01 07:42:23 -0600 |
commit | f525464a8000f092c20b00eead3eaa9d849c599e (patch) | |
tree | 6a05793a03d8cf7c52635e886f73203633329cbe /block/genhd.c | |
parent | 958229a7c55f219b1cff99f939dabbc1b6ba7161 (diff) | |
download | linux-stable-f525464a8000f092c20b00eead3eaa9d849c599e.tar.gz linux-stable-f525464a8000f092c20b00eead3eaa9d849c599e.tar.bz2 linux-stable-f525464a8000f092c20b00eead3eaa9d849c599e.zip |
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.c | 35 |
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"; |