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b=pAAUK8xIBrTLmZBWd7jWub9Eap+4labhYwFwPFXrHKfjYH58DE+TRQrdbYgYf0sG9 vuXD2dHLbZhjnFdAILj2MFTo/QhcZJSZ0r25L4dIJSd3l7Ke4AwadVC2q0Z6STvsRV c7NRkaxj8qCllb3oSoQlHonVjwSzWpYNIvhIRlzujuLmsdulFw/5nVgk2qyUOSW1J4 vi7BQiIv6DA4zo/yrl/jKef8QbfKTnchHJ6HEhnzrQChxJ6JTR+/7txs6cPFeS1nQc i4LZU+J2ZmQIQ7aSUaCe4g2/C1mwDfygX30A8AGOqmFyPwYkRLh1xYPiyq1JIozgTC 8lNdE2YwlIBJg== Date: Mon, 24 Nov 2025 07:20:17 +0200 From: Mike Rapoport To: Pasha Tatashin Cc: pratyush@kernel.org, jasonmiu@google.com, graf@amazon.com, dmatlack@google.com, rientjes@google.com, corbet@lwn.net, rdunlap@infradead.org, ilpo.jarvinen@linux.intel.com, kanie@linux.alibaba.com, ojeda@kernel.org, aliceryhl@google.com, masahiroy@kernel.org, akpm@linux-foundation.org, tj@kernel.org, yoann.congal@smile.fr, mmaurer@google.com, roman.gushchin@linux.dev, chenridong@huawei.com, axboe@kernel.dk, mark.rutland@arm.com, jannh@google.com, vincent.guittot@linaro.org, hannes@cmpxchg.org, dan.j.williams@intel.com, david@redhat.com, joel.granados@kernel.org, rostedt@goodmis.org, anna.schumaker@oracle.com, song@kernel.org, linux@weissschuh.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, gregkh@linuxfoundation.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, rafael@kernel.org, dakr@kernel.org, bartosz.golaszewski@linaro.org, cw00.choi@samsung.com, myungjoo.ham@samsung.com, yesanishhere@gmail.com, Jonathan.Cameron@huawei.com, quic_zijuhu@quicinc.com, aleksander.lobakin@intel.com, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, leon@kernel.org, lukas@wunner.de, bhelgaas@google.com, wagi@kernel.org, djeffery@redhat.com, stuart.w.hayes@gmail.com, ptyadav@amazon.de, lennart@poettering.net, brauner@kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, saeedm@nvidia.com, ajayachandra@nvidia.com, jgg@nvidia.com, parav@nvidia.com, leonro@nvidia.com, witu@nvidia.com, hughd@google.com, skhawaja@google.com, chrisl@kernel.org Subject: Re: [PATCH v7 07/22] liveupdate: luo_session: Add ioctls for file preservation Message-ID: References: <20251122222351.1059049-1-pasha.tatashin@soleen.com> <20251122222351.1059049-8-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251122222351.1059049-8-pasha.tatashin@soleen.com> X-Rspamd-Queue-Id: 1883B180007 X-Stat-Signature: y1nzggmottfrq73uqszc599i4qyu71ut X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1763961642-354930 X-HE-Meta: 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 xzZeP/ii BJKsFCJ6f3C05w/XXaumzJM1Uq9iaQhoeR6xezUlD2Qz0cyIIKoq9ALnLPS2ugrieOFjlBZByls7dLwR+X2hRficz6GY5TgctVU56l37Z3HtghKQD/keaCLRzzLK1hwuoN66CAT7WIq5s6GdxJA1wZF+dfD3rMd6d3gj3/qrXdeRPD12gaZA280BOzOhDB6VixpjvhyWVxk+s1TxCJaencA/bST5CtxIRyGgrl0Gtow7ISktkFztbvFzM2mtZiM8W7k0M301YrpFVEq4wwvoI+7ORxF/siY3Wj0W9MPyJ55vQZBwbEmIpzLVVvu896Qh8lkLJs22KPRlAqVHs0n2dkzHTJVJVdycMfBBVvvWMCIiqpYlYASL+f96cJfLc3DQSR1Ffb5pyx9CGNqGqF0HAcUFB2gosp2rdBiA0x8OQVJuyeTBQTXgcjL3KmFHy/j7Pky56/6xothT0hBY= 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 Sat, Nov 22, 2025 at 05:23:34PM -0500, Pasha Tatashin wrote: > Introducing the userspace interface and internal logic required to > manage the lifecycle of file descriptors within a session. Previously, a > session was merely a container; this change makes it a functional > management unit. > > The following capabilities are added: > > A new set of ioctl commands are added, which operate on the file > descriptor returned by CREATE_SESSION. This allows userspace to: > - LIVEUPDATE_SESSION_PRESERVE_FD: Add a file descriptor to a session > to be preserved across the live update. > - LIVEUPDATE_SESSION_RETRIEVE_FD: Retrieve a preserved file in the > new kernel using its unique token. > - LIVEUPDATE_SESSION_FINISH: finish session > > The session's .release handler is enhanced to be state-aware. When a > session's file descriptor is closed, it correctly unpreserves > the session based on its current state before freeing all > associated file resources. > > Signed-off-by: Pasha Tatashin > Reviewed-by: Pratyush Yadav Reviewed-by: Mike Rapoport (Microsoft) > --- > include/uapi/linux/liveupdate.h | 103 ++++++++++++++++++ > kernel/liveupdate/luo_session.c | 187 +++++++++++++++++++++++++++++++- > 2 files changed, 288 insertions(+), 2 deletions(-) -- Sincerely yours, Mike.