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Thu, 28 Jan 2021 08:33:10 +0000 From: Chaitanya Kulkarni To: Damien Le Moal , "linux-xfs@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "dm-devel@redhat.com" , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "drbd-dev@lists.linbit.com" , "xen-devel@lists.xenproject.org" , "linux-nvme@lists.infradead.org" , "linux-scsi@vger.kernel.org" , "target-devel@vger.kernel.org" , "linux-fscrypt@vger.kernel.org" , "jfs-discussion@lists.sourceforge.net" , "linux-nilfs@vger.kernel.org" , "ocfs2-devel@oss.oracle.com" , "linux-pm@vger.kernel.org" , "linux-mm@kvack.org" CC: "axboe@kernel.dk" , "philipp.reisner@linbit.com" , "lars.ellenberg@linbit.com" , "konrad.wilk@oracle.com" , "roger.pau@citrix.com" , "minchan@kernel.org" , "ngupta@vflare.org" , "sergey.senozhatsky.work@gmail.com" , "agk@redhat.com" , "snitzer@redhat.com" , "hch@lst.de" , "sagi@grimberg.me" , "martin.petersen@oracle.com" , "viro@zeniv.linux.org.uk" , "tytso@mit.edu" , "jaegeuk@kernel.org" , "ebiggers@kernel.org" , "djwong@kernel.org" , "shaggy@kernel.org" , "konishi.ryusuke@gmail.com" , "mark@fasheh.com" , "jlbec@evilplan.org" , "joseph.qi@linux.alibaba.com" , Naohiro Aota , "jth@kernel.org" , "rjw@rjwysocki.net" , "len.brown@intel.com" , "pavel@ucw.cz" , "akpm@linux-foundation.org" , "hare@suse.de" , "gustavoars@kernel.org" , "tiwai@suse.de" , "alex.shi@linux.alibaba.com" , "asml.silence@gmail.com" , "ming.lei@redhat.com" , "tj@kernel.org" , "osandov@fb.com" , "bvanassche@acm.org" , "jefflexu@linux.alibaba.com" Subject: Re: [RFC PATCH 02/34] block: introduce and use bio_new Thread-Topic: [RFC PATCH 02/34] block: introduce and use bio_new Thread-Index: AQHW9UTnc64/mAmIvESrRLPcPpiQkQ== Date: Thu, 28 Jan 2021 08:33:10 +0000 Message-ID: References: <20210128071133.60335-1-chaitanya.kulkarni@wdc.com> <20210128071133.60335-3-chaitanya.kulkarni@wdc.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: wdc.com; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable On 1/27/21 11:21 PM, Damien Le Moal wrote: On 2021/01/28 16:12, Chaitanya Kulkarni wrote: Introduce bio_new() helper and use it in blk-lib.c to allocate and initialize various non-optional or semi-optional members of the bio along with bio allocation done with bio_alloc(). Here we also calmp the max_bvecs for bio with BIO_MAX_PAGES before we pass to bio_alloc(). Signed-off-by: Chaitanya Kulkarni --- block/blk-lib.c | 6 +----- include/linux/bio.h | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+), 5 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index fb486a0bdb58..ec29415f00dd 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -14,17 +14,13 @@ struct bio *blk_next_bio(struct bio *bio, struct block_= device *bdev, sector_t sect, unsigned op, unsigned opf, unsigned int nr_pages, gfp_t gfp) { - struct bio *new =3D bio_alloc(gfp, nr_pages); + struct bio *new =3D bio_new(bdev, sect, op, opf, gfp, nr_pages); if (bio) { bio_chain(bio, new); submit_bio(bio); } - new->bi_iter.bi_sector =3D sect; - bio_set_dev(new, bdev); - bio_set_op_attrs(new, op, opf); - return new; } diff --git a/include/linux/bio.h b/include/linux/bio.h index c74857cf1252..2a09ba100546 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -826,5 +826,30 @@ static inline void bio_set_polled(struct bio *bio, str= uct kiocb *kiocb) if (!is_sync_kiocb(kiocb)) bio->bi_opf |=3D REQ_NOWAIT; } +/** + * bio_new - allcate and initialize new bio + * @bdev: blockdev to issue discard for + * @sector: start sector + * @op: REQ_OP_XXX from enum req_opf + * @op_flags: REQ_XXX from enum req_flag_bits + * @max_bvecs: maximum bvec to be allocated for this bio + * @gfp_mask: memory allocation flags (for bio_alloc) + * + * Description: + * Allocates, initializes common members, and returns a new bio. + */ +static inline struct bio *bio_new(struct block_device *bdev, sector_t sect= or, + unsigned int op, unsigned int op_flags, + unsigned int max_bvecs, gfp_t gfp_mask) +{ + unsigned nr_bvec =3D clamp_t(unsigned int, max_bvecs, 0, BIO_MAX_PA= GES); + struct bio *bio =3D bio_alloc(gfp_mask, nr_bvec); I think that depending on the gfp_mask passed, bio can be NULL. So this sho= uld be checked. true, I'll add that check. + + bio_set_dev(bio, bdev); + bio->bi_iter.bi_sector =3D sector; + bio_set_op_attrs(bio, op, op_flags); This function is obsolete. Open code this. true, will do. + + return bio; +} #endif /* __LINUX_BIO_H */ Thanks for the comments Damien. --_000_DM6PR04MB4972DA86892CF4531440064F86BA9DM6PR04MB4972namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
On 1/27/21 11:21 PM, Damien Le Moal wrote: 
On 2021/01/28 16:12, Chaitanya Kulka=
rni wrote:=0A=

Introduce bio_new() helper and use i=
t in blk-lib.c to allocate and=0A=
initialize various non-optional or semi-optional members of the bio=0A=
along with bio allocation done with bio_alloc(). Here we also calmp the=0A=
max_bvecs for bio with BIO_MAX_PAGES before we pass to bio_alloc().=0A=
=0A=
Signed-off-by: Chaitanya Kulkarni <chaitan=
ya.kulkarni@wdc.com>=0A=
---=0A=
 block/blk-lib.c     |  6 +-----=0A=
 include/linux/bio.h | 25 +++++++++++++++++++++++++=0A=
 2 files changed, 26 insertions(+), 5 deletions(-)=0A=
=0A=
diff --git a/block/blk-lib.c b/block/blk-lib.c=0A=
index fb486a0bdb58..ec29415f00dd 100644=0A=
--- a/block/blk-lib.c=0A=
+++ b/block/blk-lib.c=0A=
@@ -14,17 +14,13 @@ struct bio *blk_next_bio(struct bio *bio, struct block_=
device *bdev,=0A=
 			sector_t sect, unsigned op, unsigned opf,=0A=
 			unsigned int nr_pages, gfp_t gfp)=0A=
 {=0A=
-	struct bio *new =3D bio_alloc(gfp, nr_pages);=0A=
+	struct bio *new =3D bio_new(bdev, sect, op, opf, gfp, nr_pages);=0A=
 =0A=
 	if (bio) {=0A=
 		bio_chain(bio, new);=0A=
 		submit_bio(bio);=0A=
 	}=0A=
 =0A=
-	new->bi_iter.bi_sector =3D sect;=0A=
-	bio_set_dev(new, bdev);=0A=
-	bio_set_op_attrs(new, op, opf);=0A=
-=0A=
 	return new;=0A=
 }=0A=
 =0A=
diff --git a/include/linux/bio.h b/include/linux/bio.h=0A=
index c74857cf1252..2a09ba100546 100644=0A=
--- a/include/linux/bio.h=0A=
+++ b/include/linux/bio.h=0A=
@@ -826,5 +826,30 @@ static inline void bio_set_polled(struct bio *bio, str=
uct kiocb *kiocb)=0A=
 	if (!is_sync_kiocb(kiocb))=0A=
 		bio->bi_opf |=3D REQ_NOWAIT;=0A=
 }=0A=
+/**=0A=
+ * bio_new -	allcate and initialize new bio=0A=
+ * @bdev:	blockdev to issue discard for=0A=
+ * @sector:	start sector=0A=
+ * @op:		REQ_OP_XXX from enum req_opf=0A=
+ * @op_flags:	REQ_XXX from enum req_flag_bits=0A=
+ * @max_bvecs:	maximum bvec to be allocated for this bio=0A=
+ * @gfp_mask:	memory allocation flags (for bio_alloc)=0A=
+ *=0A=
+ * Description:=0A=
+ *    Allocates, initializes common members, and returns a new bio.=0A=
+ */=0A=
+static inline struct bio *bio_new(struct block_device *bdev, sector_t sect=
or,=0A=
+				  unsigned int op, unsigned int op_flags,=0A=
+				  unsigned int max_bvecs, gfp_t gfp_mask)=0A=
+{=0A=
+	unsigned nr_bvec =3D clamp_t(unsigned int, max_bvecs, 0, BIO_MAX_PAGES);=
=0A=
+	struct bio *bio =3D bio_alloc(gfp_mask, nr_bvec);=0A=

I think that depending on the gfp_ma=
sk passed, bio can be NULL. So this should=0A=
be checked.=0A=
true, I'll add that check.
=0A=

+=0A=
+	bio_set_dev(bio, bdev);=0A=
+	bio->bi_iter.bi_sector =3D sector;=0A=
+	bio_set_op_attrs(bio, op, op_flags);=0A=

This function is obsolete. Open code=
 this.=0A=
true, will do.
=0A=

+=0A=
+	return bio;=0A=
+}=0A=
 =0A=
 #endif /* __LINUX_BIO_H */=0A=
=0A=

Thanks for the comments Damien.

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