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block: Consolidate duplicated bio_trim() implementations

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Someone cut and pasted md's md_trim_bio() into xen-blkfront.c. Come on,
we should know better than this.

Signed-off-by: Kent Overstreet <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Neil Brown <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Kent Overstreet 2013-08-07 11:14:32 -07:00 • committed by Jens Axboe
commit 6678d83f18
7 changed files with 61 additions and 108 deletions
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46
fs/bio.c
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@ -1804,6 +1804,52 @@ struct bio_pair *bio_split(struct bio *bi, int first_sectors)
}
EXPORT_SYMBOL(bio_split);
/**
* bio_trim - trim a bio
* @bio: bio to trim
* @offset: number of sectors to trim from the front of @bio
* @size: size we want to trim @bio to, in sectors
*/
void bio_trim(struct bio *bio, int offset, int size)
{
/* 'bio' is a cloned bio which we need to trim to match
* the given offset and size.
* This requires adjusting bi_sector, bi_size, and bi_io_vec
*/
int i;
struct bio_vec *bvec;
int sofar = 0;
size <<= 9;
if (offset == 0 && size == bio->bi_size)
return;
clear_bit(BIO_SEG_VALID, &bio->bi_flags);
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,
(bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
bio->bi_vcnt -= bio->bi_idx;
bio->bi_idx = 0;
}
/* Make sure vcnt and last bv are not too big */
bio_for_each_segment(bvec, bio, i) {
if (sofar + bvec->bv_len > size)
bvec->bv_len = size - sofar;
if (bvec->bv_len == 0) {
bio->bi_vcnt = i;
break;
}
sofar += bvec->bv_len;
}
}
EXPORT_SYMBOL_GPL(bio_trim);
/**
* bio_sector_offset - Find hardware sector offset in bio
* @bio: bio to inspect