diff options
| -rw-r--r-- | block/bio.c | 16 | ||||
| -rw-r--r-- | include/linux/bio.h | 1 |
2 files changed, 16 insertions, 1 deletions
diff --git a/block/bio.c b/block/bio.c index 586e11dbf507..69654714d629 100644 --- a/block/bio.c +++ b/block/bio.c @@ -855,7 +855,20 @@ static void bio_get_pages(struct bio *bio) get_page(bvec->bv_page); } -static void bio_release_pages(struct bio *bio, bool from_gup) +/** + * bio_release_pages() - release all pages in a bio + * @bio: the bio struct containing the pages to release + * @from_gup: did the pages in the bio came from GUP (get_user_pages*()) + * + * This will release page reference for all the pages in the bio. + * + * We also need to know if the pages in the bio are coming from GUP or not as + * GUPed page need to be release through specific put_user_page(). Please see + * Documentation/vm/get_user_pages.rst for details on that. Rules of dumb is + * that if the bio has been populated with the help of iov_iter_get_pages*() + * then it might have GUPed pages (see iov_iter_get_pages_use_gup()) + */ +void bio_release_pages(struct bio *bio, bool from_gup) { struct bio_vec *bvec; struct bvec_iter_all iter_all; @@ -868,6 +881,7 @@ static void bio_release_pages(struct bio *bio, bool from_gup) put_page(bvec->bv_page); } } +EXPORT_SYMBOL_GPL(bio_release_pages); static int __bio_iov_bvec_add_pages(struct bio *bio, struct iov_iter *iter) { diff --git a/include/linux/bio.h b/include/linux/bio.h index 06d334fe38f9..ed861951db45 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -436,6 +436,7 @@ extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, gfp_t, int); extern void bio_set_pages_dirty(struct bio *bio); +extern void bio_release_pages(struct bio *bio, bool from_gup); extern void bio_check_pages_dirty(struct bio *bio, bool from_gup); void generic_start_io_acct(struct request_queue *q, int op, |