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md: Convert md_trim_bio() to use bio_advance()

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Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: NeilBrown <neilb@suse.de>
Acked-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Kent Overstreet 2012-09-26 21:41:20 -07:00
parent f79ea41614
commit fb9e353476
1 changed files with 4 additions and 13 deletions
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17
drivers/md/md.c
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@ -194,21 +194,12 @@ void md_trim_bio(struct bio *bio, int offset, int size)
if (offset == 0 && size == bio->bi_size)
return;
bio->bi_sector += offset;
bio->bi_size = size;
offset <<= 9;
clear_bit(BIO_SEG_VALID, &bio->bi_flags);
while (bio->bi_idx < bio->bi_vcnt &&
bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
/* remove this whole bio_vec */
offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
bio->bi_idx++;
}
if (bio->bi_idx < bio->bi_vcnt) {
bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
}
bio_advance(bio, offset << 9);
bio->bi_size = size;
/* avoid any complications with bi_idx being non-zero*/
if (bio->bi_idx) {
memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,