ext4 crypto: implement the ext4 encryption write path
Pulls block_write_begin() into fs/ext4/inode.c because it might need to do a low-level read of the existing data, in which case we need to decrypt it. Signed-off-by: NMichael Halcrow <mhalcrow@google.com> Signed-off-by: NIldar Muslukhov <ildarm@google.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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