platform_system_sepolicy/public/e2fs.te

type e2fs, domain, coredomain;
type e2fs_exec, system_file_type, exec_type, file_type;

allow e2fs devpts:chr_file { read write getattr ioctl };

allow e2fs dev_type:blk_file getattr;
allow e2fs block_device:dir search;
allow e2fs userdata_block_device:blk_file rw_file_perms;
allow e2fs metadata_block_device:blk_file rw_file_perms;
allow e2fs dm_device:blk_file rw_file_perms;
allowxperm e2fs { userdata_block_device metadata_block_device dm_device }:blk_file ioctl {
  BLKSECDISCARD BLKDISCARD BLKPBSZGET BLKDISCARDZEROES BLKROGET BLKREPORTZONE BLKRESETZONE
};

allow e2fs {
  proc_filesystems
  proc_mounts
  proc_swaps
}:file r_file_perms;

# access /sys/fs/ext4/features
allow e2fs sysfs_fs_ext4_features:dir search;
allow e2fs sysfs_fs_ext4_features:file r_file_perms;

# access SELinux context files
allow e2fs file_contexts_file:file r_file_perms;