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authorChristoph Hellwig <hch@lst.de>2017-06-03 09:38:04 +0200
committerJens Axboe <axboe@fb.com>2017-06-09 09:27:32 -0600
commit2a842acab109f40f0d7d10b38e9ca88390628996 (patch)
treebdfc7a47fe655c2ea7a5f74127015d7a502042f0 /drivers/block/virtio_blk.c
parent1be5690984588953e759af0a4c6ddac182a1806c (diff)
downloadlinux-2a842acab109f40f0d7d10b38e9ca88390628996.tar.bz2
block: introduce new block status code type
Currently we use nornal Linux errno values in the block layer, and while we accept any error a few have overloaded magic meanings. This patch instead introduces a new blk_status_t value that holds block layer specific status codes and explicitly explains their meaning. Helpers to convert from and to the previous special meanings are provided for now, but I suspect we want to get rid of them in the long run - those drivers that have a errno input (e.g. networking) usually get errnos that don't know about the special block layer overloads, and similarly returning them to userspace will usually return somethings that strictly speaking isn't correct for file system operations, but that's left as an exercise for later. For now the set of errors is a very limited set that closely corresponds to the previous overloaded errno values, but there is some low hanging fruite to improve it. blk_status_t (ab)uses the sparse __bitwise annotations to allow for sparse typechecking, so that we can easily catch places passing the wrong values. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/virtio_blk.c')
-rw-r--r--drivers/block/virtio_blk.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 553cc4c542b4..205b74d70efc 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -64,15 +64,15 @@ struct virtblk_req {
struct scatterlist sg[];
};
-static inline int virtblk_result(struct virtblk_req *vbr)
+static inline blk_status_t virtblk_result(struct virtblk_req *vbr)
{
switch (vbr->status) {
case VIRTIO_BLK_S_OK:
- return 0;
+ return BLK_STS_OK;
case VIRTIO_BLK_S_UNSUPP:
- return -ENOTTY;
+ return BLK_STS_NOTSUPP;
default:
- return -EIO;
+ return BLK_STS_IOERR;
}
}
@@ -307,7 +307,7 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str)
goto out;
blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
- err = virtblk_result(blk_mq_rq_to_pdu(req));
+ err = blk_status_to_errno(virtblk_result(blk_mq_rq_to_pdu(req)));
out:
blk_put_request(req);
return err;