| 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
| ||
|
Message-ID: <BL0PR04MB6514C554B4AC96866BC1B16FE7BA9@BL0PR04MB6514.namprd04.prod.outlook.com>
Date: Thu, 28 Jan 2021 07:21:42 +0000
From: Damien Le Moal <Damien.LeMoal@....com>
To: Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
"linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
"dm-devel@...hat.com" <dm-devel@...hat.com>,
"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"drbd-dev@...ts.linbit.com" <drbd-dev@...ts.linbit.com>,
"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
"linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
"linux-fscrypt@...r.kernel.org" <linux-fscrypt@...r.kernel.org>,
"jfs-discussion@...ts.sourceforge.net"
<jfs-discussion@...ts.sourceforge.net>,
"linux-nilfs@...r.kernel.org" <linux-nilfs@...r.kernel.org>,
"ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>
CC: "axboe@...nel.dk" <axboe@...nel.dk>,
"philipp.reisner@...bit.com" <philipp.reisner@...bit.com>,
"lars.ellenberg@...bit.com" <lars.ellenberg@...bit.com>,
"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
"roger.pau@...rix.com" <roger.pau@...rix.com>,
"minchan@...nel.org" <minchan@...nel.org>,
"ngupta@...are.org" <ngupta@...are.org>,
"sergey.senozhatsky.work@...il.com"
<sergey.senozhatsky.work@...il.com>,
"agk@...hat.com" <agk@...hat.com>,
"snitzer@...hat.com" <snitzer@...hat.com>,
"hch@....de" <hch@....de>, "sagi@...mberg.me" <sagi@...mberg.me>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
"tytso@....edu" <tytso@....edu>,
"jaegeuk@...nel.org" <jaegeuk@...nel.org>,
"ebiggers@...nel.org" <ebiggers@...nel.org>,
"djwong@...nel.org" <djwong@...nel.org>,
"shaggy@...nel.org" <shaggy@...nel.org>,
"konishi.ryusuke@...il.com" <konishi.ryusuke@...il.com>,
"mark@...heh.com" <mark@...heh.com>,
"jlbec@...lplan.org" <jlbec@...lplan.org>,
"joseph.qi@...ux.alibaba.com" <joseph.qi@...ux.alibaba.com>,
Naohiro Aota <Naohiro.Aota@....com>,
"jth@...nel.org" <jth@...nel.org>,
"rjw@...ysocki.net" <rjw@...ysocki.net>,
"len.brown@...el.com" <len.brown@...el.com>,
"pavel@....cz" <pavel@....cz>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"hare@...e.de" <hare@...e.de>,
"gustavoars@...nel.org" <gustavoars@...nel.org>,
"tiwai@...e.de" <tiwai@...e.de>,
"alex.shi@...ux.alibaba.com" <alex.shi@...ux.alibaba.com>,
"asml.silence@...il.com" <asml.silence@...il.com>,
"ming.lei@...hat.com" <ming.lei@...hat.com>,
"tj@...nel.org" <tj@...nel.org>, "osandov@...com" <osandov@...com>,
"bvanassche@....org" <bvanassche@....org>,
"jefflexu@...ux.alibaba.com" <jefflexu@...ux.alibaba.com>
Subject: Re: [RFC PATCH 02/34] block: introduce and use bio_new
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 <chaitanya.kulkarni@....com>
> ---
> 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 = bio_alloc(gfp, nr_pages);
> + struct bio *new = bio_new(bdev, sect, op, opf, gfp, nr_pages);
>
> if (bio) {
> bio_chain(bio, new);
> submit_bio(bio);
> }
>
> - new->bi_iter.bi_sector = 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, struct kiocb *kiocb)
> if (!is_sync_kiocb(kiocb))
> bio->bi_opf |= 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 sector,
> + unsigned int op, unsigned int op_flags,
> + unsigned int max_bvecs, gfp_t gfp_mask)
> +{
> + unsigned nr_bvec = clamp_t(unsigned int, max_bvecs, 0, BIO_MAX_PAGES);
> + struct bio *bio = bio_alloc(gfp_mask, nr_bvec);
I think that depending on the gfp_mask passed, bio can be NULL. So this should
be checked.
> +
> + bio_set_dev(bio, bdev);
> + bio->bi_iter.bi_sector = sector;
> + bio_set_op_attrs(bio, op, op_flags);
This function is obsolete. Open code this.
> +
> + return bio;
> +}
>
> #endif /* __LINUX_BIO_H */
>
--
Damien Le Moal
Western Digital Research
Powered by blists - more mailing lists