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block: loop: say goodby to bio 

Switch to block request completely.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2014-12-31 13:22:58 +00:00 committed by Jens Axboe
parent b5dd2f6047
commit 3011201346
1 changed files with 20 additions and 25 deletions
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45
drivers/block/loop.c
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@ -287,12 +287,12 @@ static int do_lo_send_write(struct loop_device *lo, struct bio_vec *bvec,
return ret;
}
static int lo_send(struct loop_device *lo, struct bio *bio, loff_t pos)
static int lo_send(struct loop_device *lo, struct request *rq, loff_t pos)
{
int (*do_lo_send)(struct loop_device *, struct bio_vec *, loff_t,
struct page *page);
struct bio_vec bvec;
struct bvec_iter iter;
struct req_iterator iter;
struct page *page = NULL;
int ret = 0;
@ -306,7 +306,7 @@ static int lo_send(struct loop_device *lo, struct bio *bio, loff_t pos)
do_lo_send = do_lo_send_direct_write;
}
bio_for_each_segment(bvec, bio, iter) {
rq_for_each_segment(bvec, rq, iter) {
ret = do_lo_send(lo, &bvec, pos, page);
if (ret < 0)
break;
@ -394,19 +394,22 @@ do_lo_receive(struct loop_device *lo,
}
static int
lo_receive(struct loop_device *lo, struct bio *bio, int bsize, loff_t pos)
lo_receive(struct loop_device *lo, struct request *rq, int bsize, loff_t pos)
{
struct bio_vec bvec;
struct bvec_iter iter;
struct req_iterator iter;
ssize_t s;
bio_for_each_segment(bvec, bio, iter) {
rq_for_each_segment(bvec, rq, iter) {
s = do_lo_receive(lo, &bvec, bsize, pos);
if (s < 0)
return s;
if (s != bvec.bv_len) {
zero_fill_bio(bio);
struct bio *bio;
__rq_for_each_bio(bio, rq)
zero_fill_bio(bio);
break;
}
pos += bvec.bv_len;
@ -414,17 +417,17 @@ lo_receive(struct loop_device *lo, struct bio *bio, int bsize, loff_t pos)
return 0;
}
static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
static int do_req_filebacked(struct loop_device *lo, struct request *rq)
{
loff_t pos;
int ret;
pos = ((loff_t) bio->bi_iter.bi_sector << 9) + lo->lo_offset;
pos = ((loff_t) blk_rq_pos(rq) << 9) + lo->lo_offset;
if (bio_rw(bio) == WRITE) {
if (rq->cmd_flags & REQ_WRITE) {
struct file *file = lo->lo_backing_file;
if (bio->bi_rw & REQ_FLUSH) {
if (rq->cmd_flags & REQ_FLUSH) {
ret = vfs_fsync(file, 0);
if (unlikely(ret && ret != -EINVAL)) {
ret = -EIO;
@ -438,7 +441,7 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
* encryption is enabled, because it may give an attacker
* useful information.
*/
if (bio->bi_rw & REQ_DISCARD) {
if (rq->cmd_flags & REQ_DISCARD) {
struct file *file = lo->lo_backing_file;
int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
@ -448,22 +451,22 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
goto out;
}
ret = file->f_op->fallocate(file, mode, pos,
bio->bi_iter.bi_size);
blk_rq_bytes(rq));
if (unlikely(ret && ret != -EINVAL &&
ret != -EOPNOTSUPP))
ret = -EIO;
goto out;
}
ret = lo_send(lo, bio, pos);
ret = lo_send(lo, rq, pos);
if ((bio->bi_rw & REQ_FUA) && !ret) {
if ((rq->cmd_flags & REQ_FUA) && !ret) {
ret = vfs_fsync(file, 0);
if (unlikely(ret && ret != -EINVAL))
ret = -EIO;
}
} else
ret = lo_receive(lo, bio, lo->lo_blocksize, pos);
ret = lo_receive(lo, rq, lo->lo_blocksize, pos);
out:
return ret;
@ -474,11 +477,6 @@ struct switch_request {
struct completion wait;
};
static inline int loop_handle_bio(struct loop_device *lo, struct bio *bio)
{
return do_bio_filebacked(lo, bio);
}
/*
* Do the actual switch; called from the BIO completion routine
*/
@ -1510,7 +1508,6 @@ static void loop_handle_cmd(struct loop_cmd *cmd)
const bool write = cmd->rq->cmd_flags & REQ_WRITE;
struct loop_device *lo = cmd->rq->q->queuedata;
int ret = -EIO;
struct bio *bio;
if (lo->lo_state != Lo_bound)
goto failed;
@ -1518,9 +1515,7 @@ static void loop_handle_cmd(struct loop_cmd *cmd)
if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY))
goto failed;
ret = 0;
__rq_for_each_bio(bio, cmd->rq)
ret |= loop_handle_bio(lo, bio);
ret = do_req_filebacked(lo, cmd->rq);
failed:
if (ret)