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b=WOvBDMUm1PlZZvHn9uAcpe7U1Tw9LEy7uQ1LlFu9/EY4tP0VzCRKGrrFziva0rjbx aERK/g/ejJTr7TA7ik3vO0jtvs8i2hlBqAdFr3aG2vkcvkKZabQGZNRU8Fw4vlf+sK QtUKjzoHWo1TD4+sLtCwqwpRXRr6hFX98H0mCIYoAsHahVdHHwvK7uAmnWtRqknWWD mz/vPJKtJlG/c4WTZoo8hjlKl1pTeXwRp4rArGRyjlovDusQ6SWUya5aAgEdJH/CnV g5juBCfQTdpwhNUuFkhNSKtrzk9NXmHpcbpDN1phJ4/Jwww/Gi7+kxIFn+txxuSEzi pWRIrVq8F5s/g== From: Trond Myklebust To: Andrew Morton Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Anna Schumaker Subject: [PATCH v5 0/3] Initial NFS client support for RWF_DONTCACHE Date: Tue, 9 Sep 2025 21:53:41 -0400 Message-ID: X-Mailer: git-send-email 2.51.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 9446380006 X-Stat-Signature: zr487fdftt3i3sh74hmseksrptjhneww X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1757469227-645138 X-HE-Meta: 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 qUdpCIbe E1ZLdYXMN8JxCifQeuAElyhLGbM7rzxza2TZcN/0m0Z+KQBgXHcuAinOwWAXAWg2cJJWWUwdNk0eZq7FBJHVEKMkAoHj3FckfW5D3jMPdjdWjPyvdImPLpZrF93hXfjfxBDdIOI9G9x4YV609ZedvmAf07utEAYC63WXnMmxKzr0JTJvp8/GR+0rd3B/MVs2zROGFXu3pc+Pnd12fRZxs6oLrIK66+UgsH0Yj6Y6DWU8SIJt2Snsr5q6KB1HktUkectTcovvv05S7yv4yo6ZJacUAw6BDYRGzETZNM6VzKjSd1cSfQzOGzt44Eg== 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: From: Trond Myklebust The main issue is allowing support on 2 stage writes (i.e. unstable WRITE followed by a COMMIT) since those don't follow the current assumption that the 'dropbehind' flag can be fulfilled as soon as the writeback lock is dropped. v2: - Make use of the new iocb parameter for nfs_write_begin() v3: - Set/clear PG_DROPBEHIND on the head of the nfs_page group - Simplify helper folio_end_dropbehind v4: - Replace filemap_end_dropbehind_write() with folio_end_dropbehind() - Add a helper to replace folio_end_writeback with an equivalent that does not attempt to interpret the dropbehind flag - Keep the folio dropbehind flag set until the NFS client is ready to call folio_end_dropbehind. - Don't try to do a read-modify-write in nfs_write_begin() if the folio has the dropbehind flag set. v5: - Change helper function export types to EXPORT_SYMBOL_GPL Trond Myklebust (3): filemap: Add a helper for filesystems implementing dropbehind filemap: Add a version of folio_end_writeback that ignores dropbehind NFS: Enable use of the RWF_DONTCACHE flag on the NFS client fs/nfs/file.c | 9 +++++---- fs/nfs/nfs4file.c | 1 + fs/nfs/write.c | 4 +++- include/linux/pagemap.h | 2 ++ mm/filemap.c | 34 ++++++++++++++++++++++++++-------- 5 files changed, 37 insertions(+), 13 deletions(-) -- 2.51.0