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authorKent Overstreet <kmo@daterainc.com>2013-10-11 15:45:43 -0700
committerKent Overstreet <kmo@daterainc.com>2013-11-23 22:33:51 -0800
commit003b5c5719f159f4f4bf97511c4702a0638313dd (patch)
tree1b3cac74e22ae5a87fdb6e3066f2d728913e6e0c /drivers/block/umem.c
parent458b76ed2f9517becb74dcc8eedd70d3068ea6e4 (diff)
downloadop-kernel-dev-003b5c5719f159f4f4bf97511c4702a0638313dd.zip
op-kernel-dev-003b5c5719f159f4f4bf97511c4702a0638313dd.tar.gz
block: Convert drivers to immutable biovecs
Now that we've got a mechanism for immutable biovecs - bi_iter.bi_bvec_done - we need to convert drivers to use primitives that respect it instead of using the bvec array directly. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: NeilBrown <neilb@suse.de> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com
Diffstat (limited to 'drivers/block/umem.c')
-rw-r--r--drivers/block/umem.c50
1 files changed, 23 insertions, 27 deletions
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index dab4f1a..4cf81b5 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -108,8 +108,7 @@ struct cardinfo {
* have been written
*/
struct bio *bio, *currentbio, **biotail;
- int current_idx;
- sector_t current_sector;
+ struct bvec_iter current_iter;
struct request_queue *queue;
@@ -118,7 +117,7 @@ struct cardinfo {
struct mm_dma_desc *desc;
int cnt, headcnt;
struct bio *bio, **biotail;
- int idx;
+ struct bvec_iter iter;
} mm_pages[2];
#define DESC_PER_PAGE ((PAGE_SIZE*2)/sizeof(struct mm_dma_desc))
@@ -344,16 +343,13 @@ static int add_bio(struct cardinfo *card)
dma_addr_t dma_handle;
int offset;
struct bio *bio;
- struct bio_vec *vec;
- int idx;
+ struct bio_vec vec;
int rw;
- int len;
bio = card->currentbio;
if (!bio && card->bio) {
card->currentbio = card->bio;
- card->current_idx = card->bio->bi_iter.bi_idx;
- card->current_sector = card->bio->bi_iter.bi_sector;
+ card->current_iter = card->bio->bi_iter;
card->bio = card->bio->bi_next;
if (card->bio == NULL)
card->biotail = &card->bio;
@@ -362,18 +358,17 @@ static int add_bio(struct cardinfo *card)
}
if (!bio)
return 0;
- idx = card->current_idx;
rw = bio_rw(bio);
if (card->mm_pages[card->Ready].cnt >= DESC_PER_PAGE)
return 0;
- vec = bio_iovec_idx(bio, idx);
- len = vec->bv_len;
+ vec = bio_iter_iovec(bio, card->current_iter);
+
dma_handle = pci_map_page(card->dev,
- vec->bv_page,
- vec->bv_offset,
- len,
+ vec.bv_page,
+ vec.bv_offset,
+ vec.bv_len,
(rw == READ) ?
PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
@@ -381,7 +376,7 @@ static int add_bio(struct cardinfo *card)
desc = &p->desc[p->cnt];
p->cnt++;
if (p->bio == NULL)
- p->idx = idx;
+ p->iter = card->current_iter;
if ((p->biotail) != &bio->bi_next) {
*(p->biotail) = bio;
p->biotail = &(bio->bi_next);
@@ -391,8 +386,8 @@ static int add_bio(struct cardinfo *card)
desc->data_dma_handle = dma_handle;
desc->pci_addr = cpu_to_le64((u64)desc->data_dma_handle);
- desc->local_addr = cpu_to_le64(card->current_sector << 9);
- desc->transfer_size = cpu_to_le32(len);
+ desc->local_addr = cpu_to_le64(card->current_iter.bi_sector << 9);
+ desc->transfer_size = cpu_to_le32(vec.bv_len);
offset = (((char *)&desc->sem_control_bits) - ((char *)p->desc));
desc->sem_addr = cpu_to_le64((u64)(p->page_dma+offset));
desc->zero1 = desc->zero2 = 0;
@@ -407,10 +402,9 @@ static int add_bio(struct cardinfo *card)
desc->control_bits |= cpu_to_le32(DMASCR_TRANSFER_READ);
desc->sem_control_bits = desc->control_bits;
- card->current_sector += (len >> 9);
- idx++;
- card->current_idx = idx;
- if (idx >= bio->bi_vcnt)
+
+ bio_advance_iter(bio, &card->current_iter, vec.bv_len);
+ if (!card->current_iter.bi_size)
card->currentbio = NULL;
return 1;
@@ -439,23 +433,25 @@ static void process_page(unsigned long data)
struct mm_dma_desc *desc = &page->desc[page->headcnt];
int control = le32_to_cpu(desc->sem_control_bits);
int last = 0;
- int idx;
+ struct bio_vec vec;
if (!(control & DMASCR_DMA_COMPLETE)) {
control = dma_status;
last = 1;
}
+
page->headcnt++;
- idx = page->idx;
- page->idx++;
- if (page->idx >= bio->bi_vcnt) {
+ vec = bio_iter_iovec(bio, page->iter);
+ bio_advance_iter(bio, &page->iter, vec.bv_len);
+
+ if (!page->iter.bi_size) {
page->bio = bio->bi_next;
if (page->bio)
- page->idx = page->bio->bi_iter.bi_idx;
+ page->iter = page->bio->bi_iter;
}
pci_unmap_page(card->dev, desc->data_dma_handle,
- bio_iovec_idx(bio, idx)->bv_len,
+ vec.bv_len,
(control & DMASCR_TRANSFER_READ) ?
PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
if (control & DMASCR_HARD_ERROR) {
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