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authorKent Overstreet <kent.overstreet@gmail.com>2018-05-08 21:33:53 -0400
committerJens Axboe <axboe@kernel.dk>2018-05-14 13:16:08 -0600
commit38a72dac48f631c2a90b831a3847cde116f21d3a (patch)
tree0db49d64f2f0813ef9ddd29cf4040bcbed6d7ba9 /block
parentf4f8154a08bc5801a3f130db69e370d249e791ab (diff)
downloadlinux-38a72dac48f631c2a90b831a3847cde116f21d3a.tar.bz2
block: Add bio_copy_data_iter(), zero_fill_bio_iter()
Add versions that take bvec_iter args instead of using bio->bi_iter - to be used by bcachefs. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/bio.c44
1 files changed, 24 insertions, 20 deletions
diff --git a/block/bio.c b/block/bio.c
index ca845e440526..e849efff4616 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -530,20 +530,20 @@ err_free:
}
EXPORT_SYMBOL(bio_alloc_bioset);
-void zero_fill_bio(struct bio *bio)
+void zero_fill_bio_iter(struct bio *bio, struct bvec_iter start)
{
unsigned long flags;
struct bio_vec bv;
struct bvec_iter iter;
- bio_for_each_segment(bv, bio, iter) {
+ __bio_for_each_segment(bv, bio, iter, start) {
char *data = bvec_kmap_irq(&bv, &flags);
memset(data, 0, bv.bv_len);
flush_dcache_page(bv.bv_page);
bvec_kunmap_irq(data, &flags);
}
}
-EXPORT_SYMBOL(zero_fill_bio);
+EXPORT_SYMBOL(zero_fill_bio_iter);
/**
* bio_put - release a reference to a bio
@@ -971,28 +971,13 @@ void bio_advance(struct bio *bio, unsigned bytes)
}
EXPORT_SYMBOL(bio_advance);
-/**
- * bio_copy_data - copy contents of data buffers from one chain of bios to
- * another
- * @src: source bio list
- * @dst: destination bio list
- *
- * If @src and @dst are single bios, bi_next must be NULL - otherwise, treats
- * @src and @dst as linked lists of bios.
- *
- * Stops when it reaches the end of either @src or @dst - that is, copies
- * min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of bios).
- */
-void bio_copy_data(struct bio *dst, struct bio *src)
+void bio_copy_data_iter(struct bio *dst, struct bvec_iter dst_iter,
+ struct bio *src, struct bvec_iter src_iter)
{
- struct bvec_iter src_iter, dst_iter;
struct bio_vec src_bv, dst_bv;
void *src_p, *dst_p;
unsigned bytes;
- src_iter = src->bi_iter;
- dst_iter = dst->bi_iter;
-
while (1) {
if (!src_iter.bi_size) {
src = src->bi_next;
@@ -1029,6 +1014,25 @@ void bio_copy_data(struct bio *dst, struct bio *src)
bio_advance_iter(dst, &dst_iter, bytes);
}
}
+EXPORT_SYMBOL(bio_copy_data_iter);
+
+/**
+ * bio_copy_data - copy contents of data buffers from one chain of bios to
+ * another
+ * @src: source bio list
+ * @dst: destination bio list
+ *
+ * If @src and @dst are single bios, bi_next must be NULL - otherwise, treats
+ * @src and @dst as linked lists of bios.
+ *
+ * Stops when it reaches the end of either @src or @dst - that is, copies
+ * min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of bios).
+ */
+void bio_copy_data(struct bio *dst, struct bio *src)
+{
+ bio_copy_data_iter(dst, dst->bi_iter,
+ src, src->bi_iter);
+}
EXPORT_SYMBOL(bio_copy_data);
struct bio_map_data {