On Wed, Jan 03, 2024 at 08:41:12AM +0000, Christoph Hellwig wrote: > Move the check that the inode really is a shmemfs one from > shmem_read_folio_gfp to shmem_get_folio_gfp given that shmem_get_folio > can also be called from outside of shmem.c. Also turn it into a > WARN_ON_ONCE and error return instead of BUG_ON to be less severe. > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> No complaints from me about converting a BUGON to an error return... Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx> --D > --- > mm/shmem.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/mm/shmem.c b/mm/shmem.c > index 91e2620148b2f6..3349df6d4e0360 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -1951,6 +1951,9 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index, > int error; > bool alloced; > > + if (WARN_ON_ONCE(!shmem_mapping(inode->i_mapping))) > + return -EINVAL; > + > if (index > (MAX_LFS_FILESIZE >> PAGE_SHIFT)) > return -EFBIG; > repeat: > @@ -4895,7 +4898,6 @@ struct folio *shmem_read_folio_gfp(struct address_space *mapping, > struct folio *folio; > int error; > > - BUG_ON(!shmem_mapping(mapping)); > error = shmem_get_folio_gfp(inode, index, &folio, SGP_CACHE, > gfp, NULL, NULL); > if (error) > -- > 2.39.2 > >
