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iomap: add a bioset pointer to iomap_read_folio_ops

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Optionally allocate the bio from the bioset provided in
iomap_read_folio_ops.  If no bioset is provided, fs_bio_set is still
used, which is the standard bioset for file systems.

Based on a patch from Goldwyn Rodrigues <rgoldwyn@suse.com>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260223132021.292832-14-hch@lst.de
Tested-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christoph Hellwig 2026-02-23 05:20:13 -08:00 committed by Christian Brauner
parent 6810365c0d
commit 57287771fa
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GPG Key ID: 91C61BC06578DCA2
2 changed files with 18 additions and 2 deletions
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14
fs/iomap/bio.c
View File

@ -24,11 +24,19 @@ static void iomap_bio_submit_read(const struct iomap_iter *iter,
submit_bio(ctx->read_ctx);
}
static struct bio_set *iomap_read_bio_set(struct iomap_read_folio_ctx *ctx)
{
if (ctx->ops && ctx->ops->bio_set)
return ctx->ops->bio_set;
return &fs_bio_set;
}
static void iomap_read_alloc_bio(const struct iomap_iter *iter,
struct iomap_read_folio_ctx *ctx, size_t plen)
{
const struct iomap *iomap = &iter->iomap;
unsigned int nr_vecs = DIV_ROUND_UP(iomap_length(iter), PAGE_SIZE);
struct bio_set *bio_set = iomap_read_bio_set(ctx);
struct folio *folio = ctx->cur_folio;
gfp_t gfp = mapping_gfp_constraint(folio->mapping, GFP_KERNEL);
gfp_t orig_gfp = gfp;
@ -47,9 +55,11 @@ static void iomap_read_alloc_bio(const struct iomap_iter *iter,
* having to deal with partial page reads. This emulates what
* do_mpage_read_folio does.
*/
bio = bio_alloc(iomap->bdev, bio_max_segs(nr_vecs), REQ_OP_READ, gfp);
bio = bio_alloc_bioset(iomap->bdev, bio_max_segs(nr_vecs), REQ_OP_READ,
gfp, bio_set);
if (!bio)
bio = bio_alloc(iomap->bdev, 1, REQ_OP_READ, orig_gfp);
bio = bio_alloc_bioset(iomap->bdev, 1, REQ_OP_READ, orig_gfp,
bio_set);
if (ctx->rac)
bio->bi_opf |= REQ_RAHEAD;
bio->bi_iter.bi_sector = iomap_sector(iomap, iter->pos);

6
include/linux/iomap.h
View File

@ -515,6 +515,12 @@ struct iomap_read_ops {
*/
void (*submit_read)(const struct iomap_iter *iter,
struct iomap_read_folio_ctx *ctx);
/*
* Optional, allows filesystem to specify own bio_set, so new bio's
* can be allocated from the provided bio_set.
*/
struct bio_set *bio_set;
};
/*