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,