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b=U5/DWZ6cdFR9yvU4JXIO8vIXtAQfmLHZRzC8CcHW0N2zNyZ66zdj4I/2TLog2rsQb eZKi9F1Fk4b6kKQdPtxgrmaTLtZQhIVbOzt/LnfMdLiBwQrrsk5j2qhlRpLhd0D+ZS W/TaL7YadZ2Ar19rRqNwqaKwYvwuYSq0PbuFEtMpQOqfY+Nk7pfYA50Gt7HKodm+3L rt3NW1dm2cBqUtlWvSpFee3pGnzECQY4CZepgsTv+N7HiVVEKK3M7OlTwOBfxdf3z9 Z4w+k39Iea06TVhW3qNlbttCIZ9S5LzrngeQ1f/JaUx6iOsNfpGKwEZ1Mo6ahTemfT MDE1Dt3in1O6Q== Date: Thu, 24 Apr 2025 17:31:29 -0400 From: Mike Snitzer To: trondmy@kernel.org Cc: linux-nfs@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [RFC PATCH 3/3] NFS: Enable the RWF_DONTCACHE flag for the NFS client Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: rapqbos7p6sq8reydbthrhytjiayjuqp X-Rspamd-Queue-Id: A97D3180005 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1745530291-928768 X-HE-Meta: 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 GOqzpSmr XxuIt298pZUBbSUhi4AeKlmQP/cGyBR9bx+BZ/0blUBafTuzz4TgH7guG1OjO4REkO3ZOqyEWhc2AtriNtCiSbYNprHgn3OVfjt2GyOjpjg62ycUSZdo42rZmGXEIUng9AIPm2ZoZBt/qK/tC1rtzR12jog8DbzJCP2xgJy2rf25WHNvpepV5bqDa3BGRpDsybiKwsF9s+QMrBTfbVX5IcYiQMmlqhmZhZTp+WV4/BJl3S/hCVVuP4h8NqBW/0kEllo3p9awVcEzEk99dE1HQC8gX4PUplg2Exe98fbJyypmQFCSBpJzjUuflNjMrAzu85KikXv+LfzwGen+KNmFo+TM4Cmn9nu2ipDSz8+w4YaT+bwtGQ5TqhcVMb53YGljQyI3VTQI2KWDzAMAp5jnk+utA1wYxuUnKw7PbM8NygMr5zmz18PRyyJ1s9/qB+Xpy96lD 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 Wed, Apr 23, 2025 at 12:25:32AM -0400, trondmy@kernel.org wrote: > From: Trond Myklebust > > While the NFS readahead code has no problems using the generic code to > manage the dropbehind behaviour enabled by RWF_DONTCACHE, the write code > needs to deal with the fact that NFS writeback uses a 2 step process > (UNSTABLE write followed by COMMIT). > This commit replaces the use of the folio dropbehind flag with a local > NFS request flag that triggers the dropbehind behaviour once the data > has been written to stable storage. > > Signed-off-by: Trond Myklebust Reviewed-by: Mike Snitzer