diff options
Diffstat (limited to 'fs/ext4/ext4_crypto.h')
| -rw-r--r-- | fs/ext4/ext4_crypto.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/ext4/ext4_crypto.h b/fs/ext4/ext4_crypto.h index f7d46e8dc9d3..c2ba35a914b6 100644 --- a/fs/ext4/ext4_crypto.h +++ b/fs/ext4/ext4_crypto.h @@ -124,4 +124,24 @@ struct ext4_fname_crypto_ctx { unsigned ctfm_key_is_ready : 1; }; +/** + * For encrypted symlinks, the ciphertext length is stored at the beginning + * of the string in little-endian format. + */ +struct ext4_encrypted_symlink_data { + __le16 len; + char encrypted_path[1]; +} __attribute__((__packed__)); + +/** + * This function is used to calculate the disk space required to + * store a filename of length l in encrypted symlink format. + */ +static inline u32 encrypted_symlink_data_len(u32 l) +{ + if (l < EXT4_CRYPTO_BLOCK_SIZE) + l = EXT4_CRYPTO_BLOCK_SIZE; + return (l + sizeof(struct ext4_encrypted_symlink_data) - 1); +} + #endif /* _EXT4_CRYPTO_H */ |