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Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Baolin Wang" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Barry Song" , "Lance Yang" , "Usama Arif" , "Gregory Price" , "Ying Huang" , "Alistair Popple" , "Johannes Weiner" , "Qi Zheng" , "Shakeel Butt" , "Kairui Song" From: "Zi Yan" Subject: Re: [PATCH v3 08/14] erofs: use folio_attach/detach_private() instead of direct assignment X-Mailer: aerc 0.22.0 References: <20260907-remove-pg_private-v3-0-6ae22f9d9272@nvidia.com> <20260907-remove-pg_private-v3-8-6ae22f9d9272@nvidia.com> <5b02f5de-00b6-4f8e-9e30-6d0acedafaf4@kernel.org> <6a465ff3-21ff-435d-963b-385e7e5174fa@kernel.org> In-Reply-To: <6a465ff3-21ff-435d-963b-385e7e5174fa@kernel.org> X-ClientProxiedBy: YQZPR01CA0150.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:8c::9) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CH2PR12MB4183:EE_ 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BZaVIVVetJzoKc6kLRPCEAKGfXDChCQdzPU+tr+2DEGbuaG6TCI4mrpGKULAqCfrkCmdbh1sRadUZIImMN7Knc94BBsoyPYrjhbBc45o3qrvaQbblrFRqM49vpRisLvnbGbC/ZsPhlWTXrTir/gIdoCigagBtJaLPXJy/Ent/skclUas05VGVTY8JcEuYtY0wBcJA0U2yL8Gy73RfDdRQYrFMdvwIQnYi0gY/9OqwESX3gsDGxb2H/rW7AOeSUJHd4iAOqjlhJ4BCNfYB8Bkuv3qhyhKdGMD5rDHbB21Tz0jgKB8JDq3srrIsPHgPqNFL9AfkFvj3jlOrgEpVzvijtAVoSYCRQLHgsjSNgETSgB7/s5BjmqmZv4sm4mHXBfKGci28QaglW2j8iBVpihpRH/DVQwISekg/LUhJHqhhnxRJyAw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Sep 9, 2026 at 9:27 AM EDT, David Hildenbrand (Arm) wrote: > On 9/8/26 19:19, Zi Yan wrote: >> On Tue Sep 8, 2026 at 12:13 PM EDT, David Hildenbrand (Arm) wrote: >>> On 9/8/26 04:56, Zi Yan wrote: >>>> erofs_onlinefolio_init/split/end() use folio->private without setting >>>> PG_private or increasing folio refcount and it works. But after PG_pri= vate >>>> is replaced by checking folio->private in a future commit, it can brea= k >>>> folio_expected_ref_count(), since the folio has private data without >>>> elevated refcount. Change them to use folio_attach/detach_private(). >>> >>> Freezing the folio will properly work I assume, as we'd always freeze w= ith that >>> refcount in mind or remove the reference (detach private) early? >>=20 >> Yes. >>=20 >>> >>> I'm thinking of folio_ref_freeze() in __folio_freeze_and_split_unmapped= (). >>> >>> Or is the ref only very short-lived either way such that we don't care? >>=20 >> The folios here are locked since they are in the process of >> readahead, which requires all folios locked. So they are not reachable >> from folio split code. In additio, the private is deatched and ref is >> decreased before the folio lock is dropped. > > It would be great to summarize this interaction with core-mm (migration/s= plit) > in the patch description. Will update the commit message. --=20 Best Regards, Yan, Zi