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Date:   Fri, 12 Jan 2018 19:41:21 +0530
From:   Chandan Rajendra <>
Cc:     Chandan Rajendra <>,,
Subject: [RFC PATCH 0/8] Ext4 encryption support for blocksize < pagesize

This patchset implements code to support encryption of Ext4 filesystem
instances that have blocksize less than pagesize. The patchset has
been tested on both ppc64 and x86_64 machines.

This patchset changes the prototype of the function
fscrypt_encrypt_page(). I will make the relevant changes to the rest
of the filesystems (e.g. f2fs) and post them in the next version of
the patchset.

Chandan Rajendra (8):
  ext4: use EXT4_INODE_ENCRYPT flag to detect encrypted bio
  fs/buffer.c: make some functions non-static
  ext4: decrypt all contiguous blocks in a page
  ext4: decrypt all boundary blocks when doing buffered write
  ext4: decrypt the block that needs to be partially zeroed
  ext4: encrypt blocks whose size is less than page size
  ext4: decrypt blocks whose size is less than page size
  ext4: enable encryption for blocksize less than page size

 fs/buffer.c                     |   6 +-
 fs/crypto/bio.c                 |  25 +++-
 fs/crypto/crypto.c              |  80 ++++++++----
 fs/ext4/inode.c                 |  32 +++--
 fs/ext4/page-io.c               |  58 ++++++---
 fs/ext4/readpage.c              | 275 +++++++++++++++++++++++++++++++++++++++-
 fs/ext4/super.c                 |   9 +-
 include/linux/buffer_head.h     |   4 +
 include/linux/fscrypt.h         |   1 +
 include/linux/fscrypt_notsupp.h |  19 +--
 include/linux/fscrypt_supp.h    |  14 +-
 11 files changed, 436 insertions(+), 87 deletions(-)


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