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block: pass a minsize argument to bio_iov_iter_bounce

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When bouncing for block size > PAGE_SIZE file systems that require
file system block size alignment (e.g. zoned XFS), the bio needs to
be big enough to fit an entire block.

Fixes: 8dd5e7c75d ("block: add helpers to bounce buffer an iov_iter into bios")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Link: https://patch.msgid.link/20260507050153.1298375-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2026-05-07 07:01:47 +02:00 committed by Jens Axboe
parent 87d0740b7c
commit 32d5019ed3
3 changed files with 16 additions and 12 deletions
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23
block/bio.c
View File

@ -1279,11 +1279,12 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter,
return bio_iov_iter_align_down(bio, iter, len_align_mask);
}
static struct folio *folio_alloc_greedy(gfp_t gfp, size_t *size)
static struct folio *folio_alloc_greedy(gfp_t gfp, size_t *size,
size_t minsize)
{
struct folio *folio;
while (*size > PAGE_SIZE) {
while (*size > minsize) {
folio = folio_alloc(gfp | __GFP_NORETRY, get_order(*size));
if (folio)
return folio;
@ -1307,7 +1308,7 @@ static void bio_free_folios(struct bio *bio)
}
static int bio_iov_iter_bounce_write(struct bio *bio, struct iov_iter *iter,
size_t maxlen)
size_t maxlen, size_t minsize)
{
size_t total_len = min(maxlen, iov_iter_count(iter));
@ -1322,13 +1323,13 @@ static int bio_iov_iter_bounce_write(struct bio *bio, struct iov_iter *iter,
size_t this_len = min(total_len, SZ_1M);
struct folio *folio;
if (this_len > PAGE_SIZE * 2)
if (this_len > minsize * 2)
this_len = rounddown_pow_of_two(this_len);
if (bio->bi_iter.bi_size > BIO_MAX_SIZE - this_len)
break;
folio = folio_alloc_greedy(GFP_KERNEL, &this_len);
folio = folio_alloc_greedy(GFP_KERNEL, &this_len, minsize);
if (!folio)
break;
bio_add_folio_nofail(bio, folio, this_len, 0);
@ -1348,12 +1349,12 @@ static int bio_iov_iter_bounce_write(struct bio *bio, struct iov_iter *iter,
}
static int bio_iov_iter_bounce_read(struct bio *bio, struct iov_iter *iter,
size_t maxlen)
size_t maxlen, size_t minsize)
{
size_t len = min3(iov_iter_count(iter), maxlen, SZ_1M);
struct folio *folio;
folio = folio_alloc_greedy(GFP_KERNEL, &len);
folio = folio_alloc_greedy(GFP_KERNEL, &len, minsize);
if (!folio)
return -ENOMEM;
@ -1390,6 +1391,7 @@ static int bio_iov_iter_bounce_read(struct bio *bio, struct iov_iter *iter,
* @bio: bio to send
* @iter: iter to read from / write into
* @maxlen: maximum size to bounce
* @minsize: minimum folio allocation size
*
* Helper for direct I/O implementations that need to bounce buffer because
* we need to checksum the data or perform other operations that require
@ -1397,11 +1399,12 @@ static int bio_iov_iter_bounce_read(struct bio *bio, struct iov_iter *iter,
* copies the data into it. Needs to be paired with bio_iov_iter_unbounce()
* called on completion.
*/
int bio_iov_iter_bounce(struct bio *bio, struct iov_iter *iter, size_t maxlen)
int bio_iov_iter_bounce(struct bio *bio, struct iov_iter *iter, size_t maxlen,
size_t minsize)
{
if (op_is_write(bio_op(bio)))
return bio_iov_iter_bounce_write(bio, iter, maxlen);
return bio_iov_iter_bounce_read(bio, iter, maxlen);
return bio_iov_iter_bounce_write(bio, iter, maxlen, minsize);
return bio_iov_iter_bounce_read(bio, iter, maxlen, minsize);
}
static void bvec_unpin(struct bio_vec *bv, bool mark_dirty)

2
fs/iomap/direct-io.c
View File

@ -355,7 +355,7 @@ static ssize_t iomap_dio_bio_iter_one(struct iomap_iter *iter,
if (dio->flags & IOMAP_DIO_BOUNCE)
ret = bio_iov_iter_bounce(bio, dio->submit.iter,
iomap_max_bio_size(&iter->iomap));
iomap_max_bio_size(&iter->iomap), alignment);
else
ret = bio_iov_iter_get_pages(bio, dio->submit.iter,
alignment - 1);

3
include/linux/bio.h
View File

@ -475,7 +475,8 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty);
extern void bio_set_pages_dirty(struct bio *bio);
extern void bio_check_pages_dirty(struct bio *bio);
int bio_iov_iter_bounce(struct bio *bio, struct iov_iter *iter, size_t maxlen);
int bio_iov_iter_bounce(struct bio *bio, struct iov_iter *iter, size_t maxlen,
size_t minsize);
void bio_iov_iter_unbounce(struct bio *bio, bool is_error, bool mark_dirty);
extern void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,