[PATCH 13/15] block: add helper function for iteration of bip's bvec

Jinyoung CHOI
2023-05-03T10:25:53Z

bip_for_each_vec() performs the iteration in a page unit.

Since a bio_vec of bip is composed of multi-page in the block, a macro
that can be carried out in multi-page units has been added.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: Jinyoung Choi <j-young.choi@samsung.com>
---
include/linux/bio.h | 4 ++++
include/linux/bvec.h | 6 ++++++
2 files changed, 10 insertions(+)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index b53a595b519a..e3e437ce694c 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -695,6 +695,10 @@ static inline bool bioset_initialized(struct bio_set *bs)

#if defined(CONFIG_BLK_DEV_INTEGRITY)

+/* iterate over multi-page bvec for integrity */
+#define bip_for_each_mp_bvec(bvl, bip, iter) \
+ for_each_mp_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
+
#define bip_for_each_vec(bvl, bip, iter) \
for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)

diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index 555aae5448ae..9364c258513e 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -184,6 +184,12 @@ static inline void bvec_iter_advance_single(const struct bio_vec *bv,
((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))

+#define for_each_mp_bvec(bvl, bio_vec, iter, start) \
+ for (iter = (start); \
+ (iter).bi_size && \
+ ((bvl = mp_bvec_iter_bvec((bio_vec), (iter))), 1); \
+ bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))
+
/* for iterating one bio from start to end */
#define BVEC_ITER_ALL_INIT (struct bvec_iter) \
{ \
--
2.34.1