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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745382334; bh=7t+va58EdjenVOrQKiKXrAkZ8pnQuUBAFK8eTG4zRY0=; h=From:To:Cc:Subject:Date:From; b=PnC03gviZfaLlVUArj/wcbvlugcLaQNIYcOZpQxGgsc95Y/NM9fL1fAeEDJz41GQb CPE3cpPbVv741IacZWWwZH8FrEDpszCtUNd0+Xhb4tMih2SkWK3fpbGfayCuLNL816 ZghuDURYjnHeLjXvoEBjE4hrsinGjvodaL3tgu0WH2AKs8ucInKuQDltbOZx0buWbf fuULENg9mmagq/z2zDp2jb5tkC3Jix1egEJ/DIKEQ5OrBDnsynQcpHSouYe23OW9vp QbRZe6bP9qvyKkP/3cjg29mRb0mG8jKPq42g+YJmGEztZ6LgSkqwgLh+qyn+yDqGVr /bAwTEgx5yYzg== From: trondmy@kernel.org To: linux-nfs@vger.kernel.org Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH 0/3] Initial NFS client support for RWF_DONTCACHE Date: Wed, 23 Apr 2025 00:25:29 -0400 Message-ID: X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 6F19F40003 X-Stat-Signature: fkin7n3ddq744f56ehjndqyub79t373k X-HE-Tag: 1745382335-254184 X-HE-Meta: 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 sXftVPnT 5o88FlY/eahBZIDZlzpwKmlr/KIS4EUy/wuIEzGOGpT1JtN+LlhImXYnCl9/6pNECfoW3J5hYalQHPNMqj/9R83FtdfEPHy3UupSorbp/C+v1+mPnCjYhncVbKa7wMRtYW7pbGNzK96AsqS1r+8f/t/RxjYu1mzIvPqkdredTu5C+uu9vVqr9kdc9B9n5ZTCdzwYh9mmSawEW9HdFC0q6xZUS2D522uteHiOPPQ0SXIwUVEOgelS19O3uANk3OA/OQ/dAajVXARBulbzHFjFOnfjbq9+NIXDnCdNukSRaloH9IFbUzYypbsPZejku8QzeenxWDSEsflTmO7QlqFDiCw09OQ== 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 following patch set attempts to add support for the RWF_DONTCACHE flag in preadv2() and pwritev2() on NFS filesystems. 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. Trond Myklebust (3): filemap: Add a helper for filesystems implementing dropbehind filemap: Mark folios as dropbehind in generic_perform_write() NFS: Enable the RWF_DONTCACHE flag for the NFS client fs/nfs/file.c | 2 ++ fs/nfs/nfs4file.c | 2 ++ fs/nfs/write.c | 12 +++++++++++- include/linux/nfs_page.h | 1 + include/linux/pagemap.h | 1 + mm/filemap.c | 21 +++++++++++++++++++++ 6 files changed, 38 insertions(+), 1 deletion(-) -- 2.49.0