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ext4 crypto: implement the ext4 decryption read path

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Signed-off-by: Michael Halcrow <mhalcrow@google.com>
Signed-off-by: Ildar Muslukhov <ildarm@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Michael Halcrow 2015-04-12 00:56:10 -04:00 • committed by Theodore Ts'o
parent 2058f83a72
commit c9c7429c2e
3 changed files with 88 additions and 3 deletions
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7
fs/ext4/inode.c
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@ -3370,6 +3370,13 @@ static int __ext4_block_zero_page_range(handle_t *handle,
/* Uhhuh. Read error. Complain and punt. */
if (!buffer_uptodate(bh))
goto unlock;
if (S_ISREG(inode->i_mode) &&
ext4_encrypted_inode(inode)) {
/* We expect the key to be set. */
BUG_ON(!ext4_has_encryption_key(inode));
BUG_ON(blocksize != PAGE_CACHE_SIZE);
WARN_ON_ONCE(ext4_decrypt_one(inode, page));
}
}
if (ext4_should_journal_data(inode)) {
BUFFER_TRACE(bh, "get write access");