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[PATCH 10/16] mm/shmem: discard whole new large folios on fallocate rollback Cc: , , To: "David Hildenbrand (Arm)" , "Andrew Morton" , "Gregory Price" , "Joshua Hahn" , "Rakie Kim" , "Ying Huang" , "Johannes Weiner" , "Vladimir Davydov" , "Michal Hocko" , "Hugh Dickins" , "Baolin Wang" , "Lukas Czerner" , "Carlos Maiolino" , "Christian Brauner" , "Jan Kara" , "Daniel Verkamp" , "Jeff Xu" , "Muchun Song" , "Oscar Salvador" , "David Stevens" , "Matthew Wilcox (Oracle)" , "William Kucharski" , "Chris Li" , "Kairui Song" , "Nhat Pham" , "Miaohe Lin" , "Naoya Horiguchi" From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20261026-fixes_shmem-v1-0-703206d5fa0c@kernel.org> <20261026-fixes_shmem-v1-10-703206d5fa0c@kernel.org> In-Reply-To: <20261026-fixes_shmem-v1-10-703206d5fa0c@kernel.org> X-ClientProxiedBy: CH0PR03CA0028.namprd03.prod.outlook.com (2603:10b6:610:b0::33) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) X-Archived-By: MIME-Version: 1.0 X-MS-PublicTrafficType: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Mon Oct 26, 2026 at 5:40 AM EDT, David Hildenbrand (Arm) wrote: > When undoing a failed fallocate(), shmem_undo_range() must discard each > newly allocated folio. Its second scan instead passes large > folios to truncate_inode_partial_folio(), which does not necessarily > discard the entire large folio, but instead tries splitting it to > discard only the requested range. > > For example, with huge=3Dalways, a failed allocation starting at offset > 4 KiB can leave page 0 allocated in an otherwise empty file. > > Discard the whole folio when unfalloc is set. Note that we enter this > path only for folios that are not uptodate, and can consequently be > dropped without losing any data. > > Fixes: 55ac8bbe358b ("mm/shmem: fix race in shmem_undo_range w/THP") > Cc: stable@vger.kernel.org > Signed-off-by: David Hildenbrand (Arm) > --- > mm/shmem.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Reviewed-by: Zi Yan Rebase it on top of mm-stable: diff --git a/mm/shmem.c b/mm/shmem.c index e9f98d526fc52..7cf5a4d9d1ace 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1472,7 +1472,7 @@ static void shmem_undo_range(struct inode *inode, lof= f_t lstart, uoff_t lend, if (!unfalloc && folio_test_large(folio)) folio_mark_dirty(folio); =20 - if (!folio_test_large(folio)) { + if (unfalloc || !folio_test_large(folio)) { truncate_inode_folio(mapping, folio); } else if (truncate_inode_partial_folio(folio, lstart, lend, NULL, NULL)) { --=20 Best Regards, Yan, Zi