3 static int ubifs_crypt_get_context(struct inode
*inode
, void *ctx
, size_t len
)
5 return ubifs_xattr_get(inode
, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT
,
9 static int ubifs_crypt_set_context(struct inode
*inode
, const void *ctx
,
10 size_t len
, void *fs_data
)
12 return ubifs_xattr_set(inode
, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT
,
16 static bool ubifs_crypt_empty_dir(struct inode
*inode
)
18 return ubifs_check_dir_empty(inode
) == 0;
21 static unsigned int ubifs_crypt_max_namelen(struct inode
*inode
)
23 if (S_ISLNK(inode
->i_mode
))
24 return UBIFS_MAX_INO_DATA
;
26 return UBIFS_MAX_NLEN
;
29 static int ubifs_key_prefix(struct inode
*inode
, u8
**key
)
31 static char prefix
[] = "ubifs:";
35 return sizeof(prefix
) - 1;
38 int ubifs_encrypt(const struct inode
*inode
, struct ubifs_data_node
*dn
,
39 unsigned int in_len
, unsigned int *out_len
, int block
)
41 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
44 unsigned int pad_len
= round_up(in_len
, UBIFS_CIPHER_BLOCK_SIZE
);
46 ubifs_assert(pad_len
<= *out_len
);
47 dn
->compr_size
= cpu_to_le16(in_len
);
49 /* pad to full block cipher length */
50 if (pad_len
!= in_len
)
51 memset(p
+ in_len
, 0, pad_len
- in_len
);
53 ret
= fscrypt_encrypt_page(inode
, virt_to_page(&dn
->data
), pad_len
,
54 offset_in_page(&dn
->data
), block
, GFP_NOFS
);
56 ubifs_err(c
, "fscrypt_encrypt_page failed: %ld", PTR_ERR(ret
));
64 int ubifs_decrypt(const struct inode
*inode
, struct ubifs_data_node
*dn
,
65 unsigned int *out_len
, int block
)
67 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
69 unsigned int clen
= le16_to_cpu(dn
->compr_size
);
70 unsigned int dlen
= *out_len
;
72 if (clen
<= 0 || clen
> UBIFS_BLOCK_SIZE
|| clen
> dlen
) {
73 ubifs_err(c
, "bad compr_size: %i", clen
);
77 ubifs_assert(dlen
<= UBIFS_BLOCK_SIZE
);
78 err
= fscrypt_decrypt_page(inode
, virt_to_page(&dn
->data
), dlen
,
79 offset_in_page(&dn
->data
), block
);
81 ubifs_err(c
, "fscrypt_decrypt_page failed: %i", err
);
89 struct fscrypt_operations ubifs_crypt_operations
= {
90 .flags
= FS_CFLG_OWN_PAGES
,
91 .get_context
= ubifs_crypt_get_context
,
92 .set_context
= ubifs_crypt_set_context
,
93 .is_encrypted
= __ubifs_crypt_is_encrypted
,
94 .empty_dir
= ubifs_crypt_empty_dir
,
95 .max_namelen
= ubifs_crypt_max_namelen
,
96 .key_prefix
= ubifs_key_prefix
,