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authorChandan Rajendra <chandan@linux.ibm.com>2019-10-23 06:33:12 +0300
committerTheodore Ts'o <tytso@mit.edu>2019-11-15 00:40:45 +0300
commit196624e192f8e767b06924e46495c56846b2b64e (patch)
treeead1e1932dcd732625a4e390457d66e97d128206 /Documentation/filesystems/fscrypt.rst
parent31fb992ce675ec3326dfd4db9634480391713db8 (diff)
downloadlinux-196624e192f8e767b06924e46495c56846b2b64e.tar.xz
ext4: Enable encryption for subpage-sized blocks
Now that we have the code to support encryption for subpage-sized blocks, this commit removes the conditional check in filesystem mount code. The commit also changes the support statement in Documentation/filesystems/fscrypt.rst to reflect the fact that encryption on filesystems with blocksize less than page size now works. [EB: Tested with 'gce-xfstests -c ext4/encrypt_1k -g auto', using the new "encrypt_1k" config I created. All tests pass except for those that already fail or are excluded with the encrypt or 1k configs, and 2 tests that try to create 1023-byte symlinks which fails since encrypted symlinks are limited to blocksize-3 bytes. Also ran the dedicated encryption tests using 'kvm-xfstests -c ext4/1k -g encrypt'; all pass, including the on-disk ciphertext verification tests.] Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20191023033312.361355-3-ebiggers@kernel.org Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'Documentation/filesystems/fscrypt.rst')
-rw-r--r--Documentation/filesystems/fscrypt.rst4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst
index 8a0700af9596..b0d015a8cdc3 100644
--- a/Documentation/filesystems/fscrypt.rst
+++ b/Documentation/filesystems/fscrypt.rst
@@ -331,8 +331,8 @@ Contents encryption
-------------------
For file contents, each filesystem block is encrypted independently.
-Currently, only the case where the filesystem block size is equal to
-the system's page size (usually 4096 bytes) is supported.
+Starting from Linux kernel 5.5, encryption of filesystems with block
+size less than system's page size is supported.
Each block's IV is set to the logical block number within the file as
a little endian number, except that: