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block: Convert bio_iovec() to bvec_iter

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For immutable biovecs, we'll be introducing a new bio_iovec() that uses
our new bvec iterator to construct a biovec, taking into account
bvec_iter->bi_bvec_done - this patch updates existing users for the new
usage.

Some of the existing users really do need a pointer into the bvec array
- those uses are all going to be removed, but we'll need the
functionality from immutable to remove them - so for now rename the
existing bio_iovec() -> __bio_iovec(), and it'll be removed in a couple
patches.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Ed L. Cashin" <ecashin@coraid.com>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: dm-devel@redhat.com
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
This commit is contained in:
Kent Overstreet
2013-08-07 14:24:32 -07:00
parent 75d5d81565
commit a4ad39b1d1
6 changed files with 26 additions and 23 deletions
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20
fs/bio.c
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@@ -821,12 +821,12 @@ void bio_advance(struct bio *bio, unsigned bytes)
break;
}
if (bytes >= bio_iovec(bio)->bv_len) {
bytes -= bio_iovec(bio)->bv_len;
if (bytes >= bio_iovec(bio).bv_len) {
bytes -= bio_iovec(bio).bv_len;
bio->bi_iter.bi_idx++;
} else {
bio_iovec(bio)->bv_len -= bytes;
bio_iovec(bio)->bv_offset += bytes;
bio_iovec(bio).bv_len -= bytes;
bio_iovec(bio).bv_offset += bytes;
bytes = 0;
}
}
@@ -879,8 +879,8 @@ void bio_copy_data(struct bio *dst, struct bio *src)
unsigned src_offset, dst_offset, bytes;
void *src_p, *dst_p;
src_bv = bio_iovec(src);
dst_bv = bio_iovec(dst);
src_bv = __bio_iovec(src);
dst_bv = __bio_iovec(dst);
src_offset = src_bv->bv_offset;
dst_offset = dst_bv->bv_offset;
@@ -893,7 +893,7 @@ void bio_copy_data(struct bio *dst, struct bio *src)
if (!src)
break;
src_bv = bio_iovec(src);
src_bv = __bio_iovec(src);
}
src_offset = src_bv->bv_offset;
@@ -906,7 +906,7 @@ void bio_copy_data(struct bio *dst, struct bio *src)
if (!dst)
break;
dst_bv = bio_iovec(dst);
dst_bv = __bio_iovec(dst);
}
dst_offset = dst_bv->bv_offset;
@@ -1776,8 +1776,8 @@ struct bio_pair *bio_split(struct bio *bi, int first_sectors)
bp->bio1.bi_iter.bi_size = first_sectors << 9;
if (bi->bi_vcnt != 0) {
bp->bv1 = *bio_iovec(bi);
bp->bv2 = *bio_iovec(bi);
bp->bv1 = bio_iovec(bi);
bp->bv2 = bio_iovec(bi);
if (bio_is_rw(bi)) {
bp->bv2.bv_offset += first_sectors << 9;