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-rw-r--r--Documentation/filesystems/fscrypt.rst21
1 files changed, 11 insertions, 10 deletions
diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst
index 1b84f818e5..e86b886b64 100644
--- a/Documentation/filesystems/fscrypt.rst
+++ b/Documentation/filesystems/fscrypt.rst
@@ -31,15 +31,15 @@ However, except for filenames, fscrypt does not encrypt filesystem
metadata.
Unlike eCryptfs, which is a stacked filesystem, fscrypt is integrated
-directly into supported filesystems --- currently ext4, F2FS, and
-UBIFS. This allows encrypted files to be read and written without
-caching both the decrypted and encrypted pages in the pagecache,
-thereby nearly halving the memory used and bringing it in line with
-unencrypted files. Similarly, half as many dentries and inodes are
-needed. eCryptfs also limits encrypted filenames to 143 bytes,
-causing application compatibility issues; fscrypt allows the full 255
-bytes (NAME_MAX). Finally, unlike eCryptfs, the fscrypt API can be
-used by unprivileged users, with no need to mount anything.
+directly into supported filesystems --- currently ext4, F2FS, UBIFS,
+and CephFS. This allows encrypted files to be read and written
+without caching both the decrypted and encrypted pages in the
+pagecache, thereby nearly halving the memory used and bringing it in
+line with unencrypted files. Similarly, half as many dentries and
+inodes are needed. eCryptfs also limits encrypted filenames to 143
+bytes, causing application compatibility issues; fscrypt allows the
+full 255 bytes (NAME_MAX). Finally, unlike eCryptfs, the fscrypt API
+can be used by unprivileged users, with no need to mount anything.
fscrypt does not support encrypting files in-place. Instead, it
supports marking an empty directory as encrypted. Then, after
@@ -1382,7 +1382,8 @@ directory.) These structs are defined as follows::
u8 contents_encryption_mode;
u8 filenames_encryption_mode;
u8 flags;
- u8 __reserved[4];
+ u8 log2_data_unit_size;
+ u8 __reserved[3];
u8 master_key_identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];
u8 nonce[FSCRYPT_FILE_NONCE_SIZE];
};