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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230503102542epcms2p371143d5975c9fa4e4a081b96f6bfc2c0@epcms2p3>
Date:   Wed, 03 May 2023 19:25:42 +0900
From:   Jinyoung CHOI <j-young.choi@...sung.com>
To:     Jinyoung CHOI <j-young.choi@...sung.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>, "hch@....de" <hch@....de>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "kch@...dia.com" <kch@...dia.com>,
        "johannes.thumshirn@....com" <johannes.thumshirn@....com>,
        "willy@...radead.org" <willy@...radead.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 13/15] block: add helper function for iteration of bip's
 bvec

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@....de>
Cc: Martin K. Petersen <martin.petersen@...cle.com>

Signed-off-by: Jinyoung Choi <j-young.choi@...sung.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