From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09AB05FB92; Mon, 15 Apr 2024 11:41:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713181268; cv=none; b=jSF5TOLkgl1rVlDKWfTkp9KbOMgoNV+57HKATvzR7Q3g1STb5jc7uFaoG+oz2J3wYl0BPppccoOlStlGUDNjYE/7wn3L2Do8DwpCeoQD1P7i1yUZAfTJxxUr5qh5wRdZvA6nirayzg0af6cDejGc/sEmcxTMdOfsRrdcqbKPC24= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713181268; c=relaxed/simple; bh=X1zkxYLiNJHWnkZuJe9zjxI4v/kKlai8RkWKf/rxHUs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Suyl5LUvuclbr4jF5Lobsp4VWneNlpjVfbsKXCv9qQZCmix+ROBTCYFUU+pJ4zyj2pOQpUBFWIHc8NUhKmn0GSQ034il1wslwfBq/cwLwcRTlkN6Kgq73fkvcq5Jmep73kLW51oNNiCEtKnylhZ1s9doxZY3XxqizCLNuv4bGZw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jt0qHc9S; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jt0qHc9S" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5C24C113CC; Mon, 15 Apr 2024 11:41:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713181267; bh=X1zkxYLiNJHWnkZuJe9zjxI4v/kKlai8RkWKf/rxHUs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=jt0qHc9SAeBADTj1zz91cR3/y4890l4yJO/OStAwWSPIL6745pnt35yZoF+qQuhMP ArfuuZEMJ2WDvC0ME37Jt4+OZfRHlIBF7zZzAGeff9SOEFCxxCF2ufRpqcbP6RMtDG w2jxooGFbxb3hN8mWfEDqyAl32RpUv8y4aFd9LolvUVYKaxxWb6YIXHz+PxHdRhpev emvsXZjI02h04gI4p0Kr1zKZmLnyH6LJPx+VNKpIdIhWWMaJKpH8GXhygCGrFYPg2D ok4ctgdJOuKvz8wjPjR8sgSiKoXMunXCzC9vD8N68p1btUAQ8AF3h6S8ScHZzFNdGR kSS9cotcceaMw== Message-ID: <3570373a3db66151033a3667cb8c28bbf8bc505b.camel@kernel.org> Subject: Re: [PATCH 09/26] mm: Provide a means of invalidation without using launder_folio From: Jeff Layton To: David Howells , Christian Brauner , Gao Xiang , Dominique Martinet Cc: Matthew Wilcox , Steve French , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Eric Van Hensbergen , Ilya Dryomov , netfs@lists.linux.dev, linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Miklos Szeredi , Trond Myklebust , Christoph Hellwig , Andrew Morton , Alexander Viro , Christian Brauner , devel@lists.orangefs.org Date: Mon, 15 Apr 2024 07:41:03 -0400 In-Reply-To: <20240328163424.2781320-10-dhowells@redhat.com> References: <20240328163424.2781320-1-dhowells@redhat.com> <20240328163424.2781320-10-dhowells@redhat.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-03-28 at 16:34 +0000, David Howells wrote: > Implement a replacement for launder_folio. The key feature of > invalidate_inode_pages2() is that it locks each folio individually, unmap= s > it to prevent mmap'd accesses interfering and calls the ->launder_folio() > address_space op to flush it. This has problems: firstly, each folio is > written individually as one or more small writes; secondly, adjacent foli= os > cannot be added so easily into the laundry; thirdly, it's yet another op = to > implement. >=20 > Instead, use the invalidate lock to cause anyone wanting to add a folio t= o > the inode to wait, then unmap all the folios if we have mmaps, then, > conditionally, use ->writepages() to flush any dirty data back and then > discard all pages. >=20 > The invalidate lock prevents ->read_iter(), ->write_iter() and faulting > through mmap all from adding pages for the duration. >=20 > Signed-off-by: David Howells > cc: Matthew Wilcox > cc: Miklos Szeredi > cc: Trond Myklebust > cc: Christoph Hellwig > cc: Andrew Morton > cc: Alexander Viro > cc: Christian Brauner > cc: Jeff Layton > cc: linux-mm@kvack.org > cc: linux-fsdevel@vger.kernel.org > cc: netfs@lists.linux.dev > cc: v9fs@lists.linux.dev > cc: linux-afs@lists.infradead.org > cc: ceph-devel@vger.kernel.org > cc: linux-cifs@vger.kernel.org > cc: linux-nfs@vger.kernel.org > cc: devel@lists.orangefs.org > --- > include/linux/pagemap.h | 1 + > mm/filemap.c | 46 +++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 47 insertions(+) >=20 > diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h > index 2df35e65557d..4eb3d4177a53 100644 > --- a/include/linux/pagemap.h > +++ b/include/linux/pagemap.h > @@ -40,6 +40,7 @@ int filemap_fdatawait_keep_errors(struct address_space = *mapping); > int filemap_fdatawait_range(struct address_space *, loff_t lstart, loff_= t lend); > int filemap_fdatawait_range_keep_errors(struct address_space *mapping, > loff_t start_byte, loff_t end_byte); > +int filemap_invalidate_inode(struct inode *inode, bool flush); > =20 > static inline int filemap_fdatawait(struct address_space *mapping) > { > diff --git a/mm/filemap.c b/mm/filemap.c > index 25983f0f96e3..087f685107a5 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -4134,6 +4134,52 @@ bool filemap_release_folio(struct folio *folio, gf= p_t gfp) > } > EXPORT_SYMBOL(filemap_release_folio); > =20 > +/** > + * filemap_invalidate_inode - Invalidate/forcibly write back an inode's = pagecache > + * @inode: The inode to flush > + * @flush: Set to write back rather than simply invalidate. > + * > + * Invalidate all the folios on an inode, possibly writing them back fir= st. > + * Whilst the operation is undertaken, the invalidate lock is held to pr= event > + * new folios from being installed. > + */ > +int filemap_invalidate_inode(struct inode *inode, bool flush) > +{ > + struct address_space *mapping =3D inode->i_mapping; > + > + if (!mapping || !mapping->nrpages) > + goto out; > + > + /* Prevent new folios from being added to the inode. */ > + filemap_invalidate_lock(mapping); > + > + if (!mapping->nrpages) > + goto unlock; > + > + unmap_mapping_pages(mapping, 0, ULONG_MAX, false); > + > + /* Write back the data if we're asked to. */ > + if (flush) { > + struct writeback_control wbc =3D { > + .sync_mode =3D WB_SYNC_ALL, > + .nr_to_write =3D LONG_MAX, > + .range_start =3D 0, > + .range_end =3D LLONG_MAX, > + }; > + > + filemap_fdatawrite_wbc(mapping, &wbc); > + } > + > + /* Wait for writeback to complete on all folios and discard. */ > + truncate_inode_pages_range(mapping, 0, LLONG_MAX); > + > +unlock: > + filemap_invalidate_unlock(mapping); > +out: > + return filemap_check_errors(mapping); > +} > +EXPORT_SYMBOL(filemap_invalidate_inode); > + > #ifdef CONFIG_CACHESTAT_SYSCALL > /** > * filemap_cachestat() - compute the page cache statistics of a mapping >=20 >=20 I'd have liked to have seen the first caller of this function too. --=20 Jeff Layton From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No 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(sin.source.kernel.org [145.40.73.55]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4VJ4xf2Cggz3cT2 for ; Mon, 15 Apr 2024 21:41:10 +1000 (AEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id A339FCE0A3A; Mon, 15 Apr 2024 11:41:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5C24C113CC; Mon, 15 Apr 2024 11:41:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713181267; bh=X1zkxYLiNJHWnkZuJe9zjxI4v/kKlai8RkWKf/rxHUs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=jt0qHc9SAeBADTj1zz91cR3/y4890l4yJO/OStAwWSPIL6745pnt35yZoF+qQuhMP ArfuuZEMJ2WDvC0ME37Jt4+OZfRHlIBF7zZzAGeff9SOEFCxxCF2ufRpqcbP6RMtDG w2jxooGFbxb3hN8mWfEDqyAl32RpUv8y4aFd9LolvUVYKaxxWb6YIXHz+PxHdRhpev 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kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) MIME-Version: 1.0 X-BeenThere: linux-erofs@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development of Linux EROFS file system List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, Marc Dionne , linux-afs@lists.infradead.org, Paulo Alcantara , linux-cifs@vger.kernel.org, Miklos Szeredi , Matthew Wilcox , Christoph Hellwig , Steve French , linux-cachefs@redhat.com, Ilya Dryomov , devel@lists.orangefs.org, Shyam Prasad N , Christian Brauner , Tom Talpey , Alexander Viro , ceph-devel@vger.kernel.org, Eric Van Hensbergen , Trond Myklebust , linux-nfs@vger.kernel.org, netdev@vger.kernel.org, v9fs@lists.linux.dev, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, netfs@lists.linux.dev, Andrew Morton , linux-erofs@lists.ozlabs.org Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" On Thu, 2024-03-28 at 16:34 +0000, David Howells wrote: > Implement a replacement for launder_folio. The key feature of > invalidate_inode_pages2() is that it locks each folio individually, unmap= s > it to prevent mmap'd accesses interfering and calls the ->launder_folio() > address_space op to flush it. This has problems: firstly, each folio is > written individually as one or more small writes; secondly, adjacent foli= os > cannot be added so easily into the laundry; thirdly, it's yet another op = to > implement. >=20 > Instead, use the invalidate lock to cause anyone wanting to add a folio t= o > the inode to wait, then unmap all the folios if we have mmaps, then, > conditionally, use ->writepages() to flush any dirty data back and then > discard all pages. >=20 > The invalidate lock prevents ->read_iter(), ->write_iter() and faulting > through mmap all from adding pages for the duration. >=20 > Signed-off-by: David Howells > cc: Matthew Wilcox > cc: Miklos Szeredi > cc: Trond Myklebust > cc: Christoph Hellwig > cc: Andrew Morton > cc: Alexander Viro > cc: Christian Brauner > cc: Jeff Layton > cc: linux-mm@kvack.org > cc: linux-fsdevel@vger.kernel.org > cc: netfs@lists.linux.dev > cc: v9fs@lists.linux.dev > cc: linux-afs@lists.infradead.org > cc: ceph-devel@vger.kernel.org > cc: linux-cifs@vger.kernel.org > cc: linux-nfs@vger.kernel.org > cc: devel@lists.orangefs.org > --- > include/linux/pagemap.h | 1 + > mm/filemap.c | 46 +++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 47 insertions(+) >=20 > diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h > index 2df35e65557d..4eb3d4177a53 100644 > --- a/include/linux/pagemap.h > +++ b/include/linux/pagemap.h > @@ -40,6 +40,7 @@ int filemap_fdatawait_keep_errors(struct address_space = *mapping); > int filemap_fdatawait_range(struct address_space *, loff_t lstart, loff_= t lend); > int filemap_fdatawait_range_keep_errors(struct address_space *mapping, > loff_t start_byte, loff_t end_byte); > +int filemap_invalidate_inode(struct inode *inode, bool flush); > =20 > static inline int filemap_fdatawait(struct address_space *mapping) > { > diff --git a/mm/filemap.c b/mm/filemap.c > index 25983f0f96e3..087f685107a5 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -4134,6 +4134,52 @@ bool filemap_release_folio(struct folio *folio, gf= p_t gfp) > } > EXPORT_SYMBOL(filemap_release_folio); > =20 > +/** > + * filemap_invalidate_inode - Invalidate/forcibly write back an inode's = pagecache > + * @inode: The inode to flush > + * @flush: Set to write back rather than simply invalidate. > + * > + * Invalidate all the folios on an inode, possibly writing them back fir= st. > + * Whilst the operation is undertaken, the invalidate lock is held to pr= event > + * new folios from being installed. > + */ > +int filemap_invalidate_inode(struct inode *inode, bool flush) > +{ > + struct address_space *mapping =3D inode->i_mapping; > + > + if (!mapping || !mapping->nrpages) > + goto out; > + > + /* Prevent new folios from being added to the inode. */ > + filemap_invalidate_lock(mapping); > + > + if (!mapping->nrpages) > + goto unlock; > + > + unmap_mapping_pages(mapping, 0, ULONG_MAX, false); > + > + /* Write back the data if we're asked to. */ > + if (flush) { > + struct writeback_control wbc =3D { > + .sync_mode =3D WB_SYNC_ALL, > + .nr_to_write =3D LONG_MAX, > + .range_start =3D 0, > + .range_end =3D LLONG_MAX, > + }; > + > + filemap_fdatawrite_wbc(mapping, &wbc); > + } > + > + /* Wait for writeback to complete on all folios and discard. */ > + truncate_inode_pages_range(mapping, 0, LLONG_MAX); > + > +unlock: > + filemap_invalidate_unlock(mapping); > +out: > + return filemap_check_errors(mapping); > +} > +EXPORT_SYMBOL(filemap_invalidate_inode); > + > #ifdef CONFIG_CACHESTAT_SYSCALL > /** > * filemap_cachestat() - compute the page cache statistics of a mapping >=20 >=20 I'd have liked to have seen the first caller of this function too. --=20 Jeff Layton