Only f_path is used from backing files registered with FUSE_DEV_IOC_BACKING_OPEN, so it makes sense to allow O_PATH descriptors. O_PATH files have an empty f_op, so don't check read_iter/write_iter. Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx> --- fs/fuse/passthrough.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c index 9666d13884ce..ba3207f6c4ce 100644 --- a/fs/fuse/passthrough.c +++ b/fs/fuse/passthrough.c @@ -228,15 +228,11 @@ int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map) if (map->flags || map->padding) goto out; - file = fget(map->fd); + file = fget_raw(map->fd); res = -EBADF; if (!file) goto out; - res = -EOPNOTSUPP; - if (!file->f_op->read_iter || !file->f_op->write_iter) - goto out_fput; - backing_sb = file_inode(file)->i_sb; res = -ELOOP; if (backing_sb->s_stack_depth >= fc->max_stack_depth) -- 2.46.0
