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)
13 * Creating an encryption context is done unlocked since we
14 * operate on a new inode which is not visible to other users
15 * at this point. So, no need to check whether inode is locked.
17 return ubifs_xattr_set(inode, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT,
21 static bool ubifs_crypt_empty_dir(struct inode *inode)
23 return ubifs_check_dir_empty(inode) == 0;
26 static unsigned int ubifs_crypt_max_namelen(struct inode *inode)
28 if (S_ISLNK(inode->i_mode))
29 return UBIFS_MAX_INO_DATA;
31 return UBIFS_MAX_NLEN;
34 int ubifs_encrypt(const struct inode *inode, struct ubifs_data_node *dn,
35 unsigned int in_len, unsigned int *out_len, int block)
37 struct ubifs_info *c = inode->i_sb->s_fs_info;
40 unsigned int pad_len = round_up(in_len, UBIFS_CIPHER_BLOCK_SIZE);
42 ubifs_assert(pad_len <= *out_len);
43 dn->compr_size = cpu_to_le16(in_len);
45 /* pad to full block cipher length */
46 if (pad_len != in_len)
47 memset(p + in_len, 0, pad_len - in_len);
49 ret = fscrypt_encrypt_page(inode, virt_to_page(&dn->data), pad_len,
50 offset_in_page(&dn->data), block, GFP_NOFS);
52 ubifs_err(c, "fscrypt_encrypt_page failed: %ld", PTR_ERR(ret));
60 int ubifs_decrypt(const struct inode *inode, struct ubifs_data_node *dn,
61 unsigned int *out_len, int block)
63 struct ubifs_info *c = inode->i_sb->s_fs_info;
65 unsigned int clen = le16_to_cpu(dn->compr_size);
66 unsigned int dlen = *out_len;
68 if (clen <= 0 || clen > UBIFS_BLOCK_SIZE || clen > dlen) {
69 ubifs_err(c, "bad compr_size: %i", clen);
73 ubifs_assert(dlen <= UBIFS_BLOCK_SIZE);
74 err = fscrypt_decrypt_page(inode, virt_to_page(&dn->data), dlen,
75 offset_in_page(&dn->data), block);
77 ubifs_err(c, "fscrypt_decrypt_page failed: %i", err);
85 const struct fscrypt_operations ubifs_crypt_operations = {
86 .flags = FS_CFLG_OWN_PAGES,
87 .key_prefix = "ubifs:",
88 .get_context = ubifs_crypt_get_context,
89 .set_context = ubifs_crypt_set_context,
90 .is_encrypted = __ubifs_crypt_is_encrypted,
91 .empty_dir = ubifs_crypt_empty_dir,
92 .max_namelen = ubifs_crypt_max_namelen,