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From: Christian Schoenebeck To: Jeff Layton , Steve French , David Howells Cc: David Howells , Matthew Wilcox , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Dominique Martinet , Eric Van Hensbergen , Ilya Dryomov , Christian Brauner , 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-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Latchesar Ionkov Subject: Re: [PATCH v4 39/39] 9p: Use netfslib read/write_iter Date: Wed, 13 Dec 2023 16:39:54 +0100 Message-ID: <189166113.2PRW8NTP99@silver> In-Reply-To: <20231213152350.431591-40-dhowells@redhat.com> References: <20231213152350.431591-1-dhowells@redhat.com> <20231213152350.431591-40-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Rspamd-Queue-Id: EA0ADC001C X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: wryi35zzi4ggc1frdgb8zq7i4tpwe4dm X-HE-Tag: 1702482050-388009 X-HE-Meta: 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 U6Tgjkf9 2eEtFrY3xuzLRbIT8lBYulGrjlYBD4sDXKoRjF/tMalSOHEETc6jgONMA1QTwo3Fps5yuLIV0sYsPOOQRaje8rGYkkgtDR4FBhBMCEXhIGdhguU8844B6/sdeKEvWCpSei+T/8NN+jXSty0FAbvvW8TXjGOtclLXIA1pZOK3dkgPnIu4= 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: List-Subscribe: List-Unsubscribe: On Wednesday, December 13, 2023 4:23:49 PM CET David Howells wrote: > Use netfslib's read and write iteration helpers, allowing netfslib to take > over the management of the page cache for 9p files and to manage local disk > caching. In particular, this eliminates write_begin, write_end, writepage > and all mentions of struct page and struct folio from 9p. > > Note that netfslib now offers the possibility of write-through caching if > that is desirable for 9p: just set the NETFS_ICTX_WRITETHROUGH flag in > v9inode->netfs.flags in v9fs_set_netfs_context(). > > Note also this is untested as I can't get ganesha.nfsd to correctly parse > the config to turn on 9p support. Do you have a chance to test this 9p patch with QEMU instead maybe? /Christian