brd: add support for rw_page()

[cascardo/linux.git] / drivers / block / brd.c

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index d91f1a5..807d3d5 100644 (file)
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -328,18 +328,18 @@ static void brd_make_request(struct request_queue *q, struct bio *bio)
        struct block_device *bdev = bio->bi_bdev;
        struct brd_device *brd = bdev->bd_disk->private_data;
        int rw;
-       struct bio_vec *bvec;
+       struct bio_vec bvec;
        sector_t sector;
-       int i;
+       struct bvec_iter iter;
        int err = -EIO;
 
-       sector = bio->bi_sector;
+       sector = bio->bi_iter.bi_sector;
        if (bio_end_sector(bio) > get_capacity(bdev->bd_disk))
                goto out;
 
        if (unlikely(bio->bi_rw & REQ_DISCARD)) {
                err = 0;
-               discard_from_brd(brd, sector, bio->bi_size);
+               discard_from_brd(brd, sector, bio->bi_iter.bi_size);
                goto out;
        }
 
@@ -347,10 +347,10 @@ static void brd_make_request(struct request_queue *q, struct bio *bio)
        if (rw == READA)
                rw = READ;
 
-       bio_for_each_segment(bvec, bio, i) {
-               unsigned int len = bvec->bv_len;
-               err = brd_do_bvec(brd, bvec->bv_page, len,
-                                       bvec->bv_offset, rw, sector);
+       bio_for_each_segment(bvec, bio, iter) {
+               unsigned int len = bvec.bv_len;
+               err = brd_do_bvec(brd, bvec.bv_page, len,
+                                       bvec.bv_offset, rw, sector);
                if (err)
                        break;
                sector += len >> SECTOR_SHIFT;
@@ -360,6 +360,15 @@ out:
        bio_endio(bio, err);
 }
 
+static int brd_rw_page(struct block_device *bdev, sector_t sector,
+                      struct page *page, int rw)
+{
+       struct brd_device *brd = bdev->bd_disk->private_data;
+       int err = brd_do_bvec(brd, page, PAGE_CACHE_SIZE, 0, rw, sector);
+       page_endio(page, rw & WRITE, err);
+       return err;
+}
+
 #ifdef CONFIG_BLK_DEV_XIP
 static int brd_direct_access(struct block_device *bdev, sector_t sector,
                        void **kaddr, unsigned long *pfn)
@@ -419,6 +428,7 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
 
 static const struct block_device_operations brd_fops = {
        .owner =                THIS_MODULE,
+       .rw_page =              brd_rw_page,
        .ioctl =                brd_ioctl,
 #ifdef CONFIG_BLK_DEV_XIP
        .direct_access =        brd_direct_access,