Re: [PATCH v3 1/7] mm/memfd: use folio_nr_pages() for shmem inode accounting

Pasha Tatashin
2026-04-02T01:24:26Z

> memfd_luo_retrieve_folios() called shmem_inode_acct_blocks() and
> shmem_recalc_inode() with hardcoded 1 instead of the actual folio
> page count. memfd may use large folios (THP/hugepages), causing
> quota/limit under-accounting and incorrect stat output.
>
> Fix by using folio_nr_pages(folio) for both functions.
>
> Issue found by AI review and suggested by Pratyush Yadav <pratyush@kernel.org>.
> https://sashiko.dev/#/patchset/20260319012845.29570-1-duanchenghao%40kylinos.cn
>
> Suggested-by: Pratyush Yadav <pratyush@kernel.org>
> Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn>

Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>