From: Miklos Szeredi mszeredi@redhat.com
[ Upstream commit efad7153bf93db8565128f7567aab1d23e221098 ]
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.
Reviewed-by: Amir Goldstein amir73il@gmail.com Signed-off-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/fuse/passthrough.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c index 9666d13884ce5..62aee8289d110 100644 --- a/fs/fuse/passthrough.c +++ b/fs/fuse/passthrough.c @@ -228,16 +228,13 @@ 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; + pr_info("%s: %x:%pD %i\n", __func__, backing_sb->s_dev, file, backing_sb->s_stack_depth); res = -ELOOP; if (backing_sb->s_stack_depth >= fc->max_stack_depth) goto out_fput;