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Tue, 23 May 2023 08:08:44 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 4o3rOYx0bGTrMQAAMHmgww (envelope-from ); Tue, 23 May 2023 08:08:44 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 8C0CCA075D; Tue, 23 May 2023 10:08:44 +0200 (CEST) Date: Tue, 23 May 2023 10:08:44 +0200 From: Jan Kara To: David Howells Cc: Jens Axboe , Al Viro , Christoph Hellwig , Matthew Wilcox , Jan Kara , Jeff Layton , David Hildenbrand , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , John Hubbard Subject: Re: [PATCH v21 4/6] block: Add BIO_PAGE_PINNED and associated infrastructure Message-ID: <20230523080844.uxj3q244bcb3cot3@quack3> References: <20230522205744.2825689-1-dhowells@redhat.com> <20230522205744.2825689-5-dhowells@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230522205744.2825689-5-dhowells@redhat.com> X-Rspam-User: X-Stat-Signature: nzadkkbnaxf91bj55pf1bfhw6baz7jr8 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 4161240012 X-HE-Tag: 1684829325-790763 X-HE-Meta: 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 XU1bojnU 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon 22-05-23 21:57:42, David Howells wrote: > Add BIO_PAGE_PINNED to indicate that the pages in a bio are pinned > (FOLL_PIN) and that the pin will need removing. > > Signed-off-by: David Howells > Reviewed-by: Christoph Hellwig > Reviewed-by: John Hubbard > cc: Al Viro > cc: Jens Axboe > cc: Jan Kara > cc: Matthew Wilcox > cc: Logan Gunthorpe > cc: linux-block@vger.kernel.org Looks good to me. Feel free to add: Reviewed-by: Jan Kara Honza > --- > > Notes: > ver #10) > - Drop bio_set_cleanup_mode(), open coding it instead. > > ver #9) > - Only consider pinning in bio_set_cleanup_mode(). Ref'ing pages in > struct bio is going away. > - page_put_unpin() is removed; call unpin_user_page() and put_page() > directly. > - Use bio_release_page() in __bio_release_pages(). > - BIO_PAGE_PINNED and BIO_PAGE_REFFED can't both be set, so use if-else > when testing both of them. > > ver #8) > - Move the infrastructure to clean up pinned pages to this patch [hch]. > - Put BIO_PAGE_PINNED before BIO_PAGE_REFFED as the latter should > probably be removed at some point. FOLL_PIN can then be renumbered > first. > > block/bio.c | 6 +++--- > block/blk.h | 12 ++++++++++++ > include/linux/bio.h | 3 ++- > include/linux/blk_types.h | 1 + > 4 files changed, 18 insertions(+), 4 deletions(-) > > diff --git a/block/bio.c b/block/bio.c > index 8516adeaea26..17bd01ecde36 100644 > --- a/block/bio.c > +++ b/block/bio.c > @@ -1169,7 +1169,7 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty) > bio_for_each_segment_all(bvec, bio, iter_all) { > if (mark_dirty && !PageCompound(bvec->bv_page)) > set_page_dirty_lock(bvec->bv_page); > - put_page(bvec->bv_page); > + bio_release_page(bio, bvec->bv_page); > } > } > EXPORT_SYMBOL_GPL(__bio_release_pages); > @@ -1489,8 +1489,8 @@ void bio_set_pages_dirty(struct bio *bio) > * the BIO and re-dirty the pages in process context. > * > * It is expected that bio_check_pages_dirty() will wholly own the BIO from > - * here on. It will run one put_page() against each page and will run one > - * bio_put() against the BIO. > + * here on. It will unpin each page and will run one bio_put() against the > + * BIO. > */ > > static void bio_dirty_fn(struct work_struct *work); > diff --git a/block/blk.h b/block/blk.h > index 45547bcf1119..e1ded2ccb3ca 100644 > --- a/block/blk.h > +++ b/block/blk.h > @@ -420,6 +420,18 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio, > struct page *page, unsigned int len, unsigned int offset, > unsigned int max_sectors, bool *same_page); > > +/* > + * Clean up a page appropriately, where the page may be pinned, may have a > + * ref taken on it or neither. > + */ > +static inline void bio_release_page(struct bio *bio, struct page *page) > +{ > + if (bio_flagged(bio, BIO_PAGE_PINNED)) > + unpin_user_page(page); > + else if (bio_flagged(bio, BIO_PAGE_REFFED)) > + put_page(page); > +} > + > struct request_queue *blk_alloc_queue(int node_id); > > int disk_scan_partitions(struct gendisk *disk, fmode_t mode); > diff --git a/include/linux/bio.h b/include/linux/bio.h > index 0922729acd26..8588bcfbc6ef 100644 > --- a/include/linux/bio.h > +++ b/include/linux/bio.h > @@ -488,7 +488,8 @@ void zero_fill_bio(struct bio *bio); > > static inline void bio_release_pages(struct bio *bio, bool mark_dirty) > { > - if (bio_flagged(bio, BIO_PAGE_REFFED)) > + if (bio_flagged(bio, BIO_PAGE_REFFED) || > + bio_flagged(bio, BIO_PAGE_PINNED)) > __bio_release_pages(bio, mark_dirty); > } > > diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h > index dfd2c2cb909d..8ef209e3aa96 100644 > --- a/include/linux/blk_types.h > +++ b/include/linux/blk_types.h > @@ -323,6 +323,7 @@ struct bio { > * bio flags > */ > enum { > + BIO_PAGE_PINNED, /* Unpin pages in bio_release_pages() */ > BIO_PAGE_REFFED, /* put pages in bio_release_pages() */ > BIO_CLONED, /* doesn't own data */ > BIO_BOUNCED, /* bio is a bounce bio */ > -- Jan Kara SUSE Labs, CR