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Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Kees Cook" , "Peter Zijlstra" , "Jann Horn" , "Pedro Falcato" , "Hugh Dickins" , "Pasha Tatashin" , "Pratyush Yadav" , "Matthew Wilcox (Oracle)" , "Jan Kara" , "Lance Yang" , "Rik van Riel" , "Harry Yoo" , "Alistair Popple" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Usama Arif" , "Kiryl Shutsemau" , "Matthew Brost" , "John Hubbard" , "Peter Xu" , "Will Deacon" , "Aneesh Kumar K.V" , "Nick Piggin" , "Oscar Salvador" , "Minchan Kim" , "Muchun Song" , "Xu Xin" , "Chengming Zhou" , "Chris Li" , "Kemeng Shi" , "Nhat Pham" , "Youngjun Park" , "Gregory Price" , "Joshua Hahn" , "Rakie Kim" , "Ying Huang" , "Jason Gunthorpe" From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20261029-fixes_core-v2-0-a64ce7f83abb@kernel.org> <20261029-fixes_core-v2-5-a64ce7f83abb@kernel.org> In-Reply-To: <20261029-fixes_core-v2-5-a64ce7f83abb@kernel.org> X-ClientProxiedBy: YQBP288CA0048.CANP288.PROD.OUTLOOK.COM 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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 Thu Oct 29, 2026 at 4:33 PM EDT, David Hildenbrand (Arm) wrote: > invalidate_inode_pages2_range() skips a folio which no longer belongs to > the mapping by the time it has got the folio lock, on the assumption > that somebody else has removed it from the page cache. But the folio may > have been replaced, and then there is a new folio with the same data at > that index. > > For most cases, like folio migration, that is impossible. However, > collapse_file() only checks the refcount of the old folios, under the > i_pages lock, and relies on their folio locks from there on. That works f= or > users which repeat the lookup when they find folio->mapping changed. > The following scenario is, however, possible: > > CPU0 pwrite(O_DIRECT) CPU1 collapse_file() > kiocb_invalidate_pages() > read the folio (old data), lock it > refcount check > the write completes copy to new_folio > kiocb_invalidate_post_direct_write() > find_get_entries() -> old folio > xas_store(new_folio) > folio->mapping =3D NULL > folio_unlock(folio) > folio_lock() > folio->mapping !=3D mapping > -> continue > > In that scenario, the collapsed folio with the data from before the write > stays in the page cache after the write has returned. > > This used to be impossible, as khugepaged only collapsed files that nobod= y > had open for writing. > > Restart the lookup at that index, like shmem_undo_range() does. The same > problem seems to exist in truncate_inode_pages_range() as well when > truncate_inode_folio() fails, so handle it there as well, but slightly > differently: simply check once more through find_get_entries(). > > Fixes: 1b6444331beb ("mm/khugepaged: enable clean pagecache folio collaps= e for writable files") > Cc: stable@vger.kernel.org > Reported-by: Josef Bacik > Reviewed-by: Rik van Riel > Signed-off-by: David Hildenbrand (Arm) > --- > mm/truncate.c | 13 +++++++++++-- > 1 file changed, 11 insertions(+), 2 deletions(-) > Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi