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Date: Sun, 14 Apr 2019 17:08:04 +0530 From: Chandan Rajendra <chandan@...ux.ibm.com> To: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, linux-fscrypt@...r.kernel.org Cc: Chandan Rajendra <chandan@...ux.ibm.com>, tytso@....edu, adilger.kernel@...ger.ca, ebiggers@...nel.org, jaegeuk@...nel.org, yuchao0@...wei.com Subject: [RFC PATCH V2 14/14] 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 of filesystems with blocksize less than page size now works. Signed-off-by: Chandan Rajendra <chandan@...ux.ibm.com> --- Documentation/filesystems/fscrypt.rst | 4 ++-- fs/ext4/super.c | 7 ------- 2 files changed, 2 insertions(+), 9 deletions(-) diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst index 08c23b60e016..ff2fea121da9 100644 --- a/Documentation/filesystems/fscrypt.rst +++ b/Documentation/filesystems/fscrypt.rst @@ -213,8 +213,8 @@ 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 5.3, 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: diff --git a/fs/ext4/super.c b/fs/ext4/super.c index cadf50f9503f..549e5bec1aba 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4433,13 +4433,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) } } - if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) && - (blocksize != PAGE_SIZE)) { - ext4_msg(sb, KERN_ERR, - "Unsupported blocksize for fs encryption"); - goto failed_mount_wq; - } - if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) && !ext4_has_feature_encrypt(sb)) { ext4_set_feature_encrypt(sb); -- 2.19.1
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