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virtio_blk: remove nents member.

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It's simply a flag as to whether we have data now, so make it an
explicit function parameter rather than a member of struct
virtblk_req.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Asias He <asias@redhat.com>
This commit is contained in:
Rusty Russell 2013-03-20 15:44:27 +10:30
parent 20af3cfd20
commit 0a11cc36f7
1 changed files with 11 additions and 11 deletions
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22
drivers/block/virtio_blk.c
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@ -62,7 +62,6 @@ struct virtblk_req
struct virtio_blk *vblk;
int flags;
u8 status;
int nents;
struct scatterlist sg[];
};
@ -104,7 +103,7 @@ static inline struct virtblk_req *virtblk_alloc_req(struct virtio_blk *vblk,
static int __virtblk_add_req(struct virtqueue *vq,
struct virtblk_req *vbr,
struct scatterlist *data_sg,
unsigned data_nents)
bool have_data)
{
struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6];
unsigned int num_out = 0, num_in = 0;
@ -124,7 +123,7 @@ static int __virtblk_add_req(struct virtqueue *vq,
sgs[num_out++] = &cmd;
}
if (data_nents) {
if (have_data) {
if (vbr->out_hdr.type & VIRTIO_BLK_T_OUT)
sgs[num_out++] = data_sg;
else
@ -144,7 +143,7 @@ static int __virtblk_add_req(struct virtqueue *vq,
return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
}
static void virtblk_add_req(struct virtblk_req *vbr)
static void virtblk_add_req(struct virtblk_req *vbr, bool have_data)
{
struct virtio_blk *vblk = vbr->vblk;
DEFINE_WAIT(wait);
@ -152,7 +151,7 @@ static void virtblk_add_req(struct virtblk_req *vbr)
spin_lock_irq(vblk->disk->queue->queue_lock);
while (unlikely((ret = __virtblk_add_req(vblk->vq, vbr, vbr->sg,
vbr->nents)) < 0)) {
have_data)) < 0)) {
prepare_to_wait_exclusive(&vblk->queue_wait, &wait,
TASK_UNINTERRUPTIBLE);
@ -173,30 +172,31 @@ static void virtblk_bio_send_flush(struct virtblk_req *vbr)
vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = 0;
vbr->nents = 0;
virtblk_add_req(vbr);
virtblk_add_req(vbr, false);
}
static void virtblk_bio_send_data(struct virtblk_req *vbr)
{
struct virtio_blk *vblk = vbr->vblk;
struct bio *bio = vbr->bio;
bool have_data;
vbr->flags &= ~VBLK_IS_FLUSH;
vbr->out_hdr.type = 0;
vbr->out_hdr.sector = bio->bi_sector;
vbr->out_hdr.ioprio = bio_prio(bio);
vbr->nents = blk_bio_map_sg(vblk->disk->queue, bio, vbr->sg);
if (vbr->nents) {
if (blk_bio_map_sg(vblk->disk->queue, bio, vbr->sg)) {
have_data = true;
if (bio->bi_rw & REQ_WRITE)
vbr->out_hdr.type |= VIRTIO_BLK_T_OUT;
else
vbr->out_hdr.type |= VIRTIO_BLK_T_IN;
}
} else
have_data = false;
virtblk_add_req(vbr);
virtblk_add_req(vbr, have_data);
}
static void virtblk_bio_send_data_work(struct work_struct *work)