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[35.185.200.132]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7b92782d390sm17124484b3a.60.2025.11.18.09.38.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 09:38:39 -0800 (PST) Date: Tue, 18 Nov 2025 17:38:35 +0000 From: David Matlack To: Pasha Tatashin Cc: pratyush@kernel.org, jasonmiu@google.com, graf@amazon.com, rppt@kernel.org, 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 v6 06/20] liveupdate: luo_file: implement file systems callbacks Message-ID: References: <20251115233409.768044-1-pasha.tatashin@soleen.com> <20251115233409.768044-7-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251115233409.768044-7-pasha.tatashin@soleen.com> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 066E714000F X-Stat-Signature: nagi1xhihm15juskesogu4m4m8qocxbd X-Rspam-User: X-HE-Tag: 1763487522-282740 X-HE-Meta: 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 x9haCkkA 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 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 2025-11-15 06:33 PM, Pasha Tatashin wrote: > This patch implements the core mechanism for managing preserved > files throughout the live update lifecycle. It provides the logic to > invoke the file handler callbacks (preserve, unpreserve, freeze, > unfreeze, retrieve, and finish) at the appropriate stages. > > During the reboot phase, luo_file_freeze() serializes the final > metadata for each file (handler compatible string, token, and data > handle) into a memory region preserved by KHO. In the new kernel, > luo_file_deserialize() reconstructs the in-memory file list from this > data, preparing the session for retrieval. > > Signed-off-by: Pasha Tatashin > +int liveupdate_register_file_handler(struct liveupdate_file_handler *h); Should there be a way to unregister a file handler? If VFIO is built as module then I think it would need to be able to unregister its file handler when the module is unloaded to avoid leaking pointers to its text in LUO.