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-rw-r--r--drivers/block/loop.c64
1 files changed, 43 insertions, 21 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index c9d04497a415..5d4e31655d96 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -451,25 +451,47 @@ static int lo_req_flush(struct loop_device *lo, struct request *rq)
static void lo_complete_rq(struct request *rq)
{
struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
+ blk_status_t ret = BLK_STS_OK;
- if (unlikely(req_op(cmd->rq) == REQ_OP_READ && cmd->use_aio &&
- cmd->ret >= 0 && cmd->ret < blk_rq_bytes(cmd->rq))) {
- struct bio *bio = cmd->rq->bio;
-
- bio_advance(bio, cmd->ret);
- zero_fill_bio(bio);
+ if (!cmd->use_aio || cmd->ret < 0 || cmd->ret == blk_rq_bytes(rq) ||
+ req_op(rq) != REQ_OP_READ) {
+ if (cmd->ret < 0)
+ ret = BLK_STS_IOERR;
+ goto end_io;
}
- blk_mq_end_request(rq, cmd->ret < 0 ? BLK_STS_IOERR : BLK_STS_OK);
+ /*
+ * Short READ - if we got some data, advance our request and
+ * retry it. If we got no data, end the rest with EIO.
+ */
+ if (cmd->ret) {
+ blk_update_request(rq, BLK_STS_OK, cmd->ret);
+ cmd->ret = 0;
+ blk_mq_requeue_request(rq, true);
+ } else {
+ if (cmd->use_aio) {
+ struct bio *bio = rq->bio;
+
+ while (bio) {
+ zero_fill_bio(bio);
+ bio = bio->bi_next;
+ }
+ }
+ ret = BLK_STS_IOERR;
+end_io:
+ blk_mq_end_request(rq, ret);
+ }
}
static void lo_rw_aio_do_completion(struct loop_cmd *cmd)
{
+ struct request *rq = blk_mq_rq_from_pdu(cmd);
+
if (!atomic_dec_and_test(&cmd->ref))
return;
kfree(cmd->bvec);
cmd->bvec = NULL;
- blk_mq_complete_request(cmd->rq);
+ blk_mq_complete_request(rq);
}
static void lo_rw_aio_complete(struct kiocb *iocb, long ret, long ret2)
@@ -487,7 +509,7 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
{
struct iov_iter iter;
struct bio_vec *bvec;
- struct request *rq = cmd->rq;
+ struct request *rq = blk_mq_rq_from_pdu(cmd);
struct bio *bio = rq->bio;
struct file *file = lo->lo_backing_file;
unsigned int offset;
@@ -1702,15 +1724,16 @@ EXPORT_SYMBOL(loop_unregister_transfer);
static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
- struct loop_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);
- struct loop_device *lo = cmd->rq->q->queuedata;
+ struct request *rq = bd->rq;
+ struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
+ struct loop_device *lo = rq->q->queuedata;
- blk_mq_start_request(bd->rq);
+ blk_mq_start_request(rq);
if (lo->lo_state != Lo_bound)
return BLK_STS_IOERR;
- switch (req_op(cmd->rq)) {
+ switch (req_op(rq)) {
case REQ_OP_FLUSH:
case REQ_OP_DISCARD:
case REQ_OP_WRITE_ZEROES:
@@ -1723,8 +1746,8 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
/* always use the first bio's css */
#ifdef CONFIG_BLK_CGROUP
- if (cmd->use_aio && cmd->rq->bio && cmd->rq->bio->bi_css) {
- cmd->css = cmd->rq->bio->bi_css;
+ if (cmd->use_aio && rq->bio && rq->bio->bi_css) {
+ cmd->css = rq->bio->bi_css;
css_get(cmd->css);
} else
#endif
@@ -1736,8 +1759,9 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
static void loop_handle_cmd(struct loop_cmd *cmd)
{
- const bool write = op_is_write(req_op(cmd->rq));
- struct loop_device *lo = cmd->rq->q->queuedata;
+ struct request *rq = blk_mq_rq_from_pdu(cmd);
+ const bool write = op_is_write(req_op(rq));
+ struct loop_device *lo = rq->q->queuedata;
int ret = 0;
if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY)) {
@@ -1745,12 +1769,12 @@ static void loop_handle_cmd(struct loop_cmd *cmd)
goto failed;
}
- ret = do_req_filebacked(lo, cmd->rq);
+ ret = do_req_filebacked(lo, rq);
failed:
/* complete non-aio request */
if (!cmd->use_aio || ret) {
cmd->ret = ret ? -EIO : 0;
- blk_mq_complete_request(cmd->rq);
+ blk_mq_complete_request(rq);
}
}
@@ -1767,9 +1791,7 @@ static int loop_init_request(struct blk_mq_tag_set *set, struct request *rq,
{
struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
- cmd->rq = rq;
kthread_init_work(&cmd->work, loop_queue_work);
-
return 0;
}