ext4 crypto: reserve codepoints used by the ext4 encryption feature
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f7f3f58..e168382 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -422,7 +422,7 @@
EXT4_INODE_DIRTY = 8,
EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
EXT4_INODE_NOCOMPR = 10, /* Don't compress */
- EXT4_INODE_ENCRYPT = 11, /* Compression error */
+ EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
/* End compression flags --- maybe not all used */
EXT4_INODE_INDEX = 12, /* hash-indexed directory */
EXT4_INODE_IMAGIC = 13, /* AFS directory */
@@ -582,6 +582,13 @@
#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
+/* Encryption algorithms */
+#define EXT4_ENCRYPTION_MODE_INVALID 0
+#define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
+#define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
+#define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
+#define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
+
/*
* ioctl commands
*/
@@ -1142,7 +1149,8 @@
__le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
__u8 s_log_groups_per_flex; /* FLEX_BG group size */
__u8 s_checksum_type; /* metadata checksum algorithm used */
- __le16 s_reserved_pad;
+ __u8 s_encryption_level; /* versioning level for encryption */
+ __u8 s_reserved_pad; /* Padding to next 32bits */
__le64 s_kbytes_written; /* nr of lifetime kilobytes written */
__le32 s_snapshot_inum; /* Inode number of active snapshot */
__le32 s_snapshot_id; /* sequential ID of active snapshot */
@@ -1169,7 +1177,9 @@
__le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
__le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
__u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
- __le32 s_reserved[105]; /* Padding to the end of the block */
+ __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
+ __le32 s_lpf_ino; /* Location of the lost+found inode */
+ __le32 s_reserved[100]; /* Padding to the end of the block */
__le32 s_checksum; /* crc32c(superblock) */
};