From patchwork Sun May 20 11:35:26 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: UBIFS: improved comment for data node's format history Date: Sun, 20 May 2012 01:35:26 -0000 From: Joel Reardon X-Patchwork-Id: 160254 Message-Id: To: Artem Bityutskiy Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org A few more lines of comment on ksa_pos field in struct ubifs_data_node. Signed-off-by: Joel Reardon --- fs/ubifs/ubifs-media.h | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h index 55f2ccd..90f348c 100644 --- a/fs/ubifs/ubifs-media.h +++ b/fs/ubifs/ubifs-media.h @@ -545,6 +545,11 @@ struct ubifs_dent_node { * @padding: reserved for future, zeroes * @data: data * + * The @ksa_pos value is used for secure deletion enhancement of UBIFS. + * In older versions of UBIFS, @ksa_pos did not exist but was instead an + * unused part of @key and was set to all zeros. UBIFS partitions with secure + * deletion disabled also store all zeros for ksa_pos. + * * Note, do not forget to amend 'zero_data_node_unused()' function when * changing the padding fields. */