From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-mtd@lists.infradead.org
Cc: David Gstir <david@sigma-star.at>,
Richard Weinberger <richard@nod.at>,
kernel@pengutronix.de, linux-kernel@vger.kernel.org,
Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH 09/25] ubifs: add separate functions to init/crc a node
Date: Wed, 4 Jul 2018 14:41:21 +0200 [thread overview]
Message-ID: <20180704124137.13396-10-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20180704124137.13396-1-s.hauer@pengutronix.de>
When adding authentication support we will embed a HMAC into some
nodes. To prepare these nodes we have to first initialize the nodes,
then add a HMAC and finally add a CRC. To accomplish this add separate
ubifs_init_node/ubifs_crc_node functions.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
fs/ubifs/io.c | 42 +++++++++++++++++++++++++++---------------
fs/ubifs/ubifs.h | 2 ++
2 files changed, 29 insertions(+), 15 deletions(-)
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index fe77e9625e84..eeb8fb073d33 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -365,20 +365,8 @@ static unsigned long long next_sqnum(struct ubifs_info *c)
return sqnum;
}
-/**
- * ubifs_prepare_node - prepare node to be written to flash.
- * @c: UBIFS file-system description object
- * @node: the node to pad
- * @len: node length
- * @pad: if the buffer has to be padded
- *
- * This function prepares node at @node to be written to the media - it
- * calculates node CRC, fills the common header, and adds proper padding up to
- * the next minimum I/O unit if @pad is not zero.
- */
-void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad)
+void ubifs_init_node(struct ubifs_info *c, void *node, int len, int pad)
{
- uint32_t crc;
struct ubifs_ch *ch = node;
unsigned long long sqnum = next_sqnum(c);
@@ -389,8 +377,6 @@ void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad)
ch->group_type = UBIFS_NO_NODE_GROUP;
ch->sqnum = cpu_to_le64(sqnum);
ch->padding[0] = ch->padding[1] = 0;
- crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8);
- ch->crc = cpu_to_le32(crc);
if (pad) {
len = ALIGN(len, 8);
@@ -399,6 +385,32 @@ void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad)
}
}
+void ubifs_crc_node(struct ubifs_info *c, void *node, int len)
+{
+ struct ubifs_ch *ch = node;
+ uint32_t crc;
+
+ crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8);
+ ch->crc = cpu_to_le32(crc);
+}
+
+/**
+ * ubifs_prepare_node - prepare node to be written to flash.
+ * @c: UBIFS file-system description object
+ * @node: the node to pad
+ * @len: node length
+ * @pad: if the buffer has to be padded
+ *
+ * This function prepares node at @node to be written to the media - it
+ * calculates node CRC, fills the common header, and adds proper padding up to
+ * the next minimum I/O unit if @pad is not zero.
+ */
+void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad)
+{
+ ubifs_init_node(c, node, len, pad);
+ ubifs_crc_node(c, node, len);
+}
+
/**
* ubifs_prep_grp_node - prepare node of a group to be written to flash.
* @c: UBIFS file-system description object
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 92574045e030..485de4e27f96 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1480,6 +1480,8 @@ int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum,
int offs);
int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
int offs, int quiet, int must_chk_crc);
+void ubifs_init_node(struct ubifs_info *c, void *buf, int len, int pad);
+void ubifs_crc_node(struct ubifs_info *c, void *buf, int len);
void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad);
void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last);
int ubifs_io_init(struct ubifs_info *c);
--
2.18.0
next prev parent reply other threads:[~2018-07-04 12:47 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-04 12:41 [PATCH 00/25] UBIFS authentication support Sascha Hauer
2018-07-04 12:41 ` [PATCH 01/25] ubifs: refactor create_default_filesystem() Sascha Hauer
2018-07-04 12:41 ` [PATCH 02/25] ubifs: pass ubifs_zbranch to try_read_node() Sascha Hauer
2018-07-04 12:41 ` [PATCH 03/25] ubifs: pass ubifs_zbranch to read_znode() Sascha Hauer
2018-07-04 12:41 ` [PATCH 04/25] ubifs: export pnode_lookup as ubifs_pnode_lookup Sascha Hauer
2018-07-04 12:41 ` [PATCH 05/25] ubifs: implement ubifs_lpt_lookup using ubifs_pnode_lookup Sascha Hauer
2018-08-13 6:31 ` Sascha Hauer
2018-08-13 6:34 ` Richard Weinberger
2018-08-13 8:12 ` Sascha Hauer
2018-08-13 11:30 ` Richard Weinberger
2018-08-26 20:59 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 06/25] ubifs: drop write_node Sascha Hauer
2018-07-04 12:41 ` [PATCH 07/25] ubifs: Store read superblock node Sascha Hauer
2018-08-27 12:50 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 08/25] ubifs: Format changes for authentication support Sascha Hauer
2018-07-04 12:41 ` Sascha Hauer [this message]
2018-07-04 12:41 ` [PATCH 10/25] ubifs: add helper functions " Sascha Hauer
2018-08-27 12:50 ` Richard Weinberger
2018-08-29 6:30 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 11/25] ubifs: Create functions to embed a HMAC in a node Sascha Hauer
2018-07-04 12:41 ` [PATCH 12/25] ubifs: Add hashes to the tree node cache Sascha Hauer
2018-08-27 19:18 ` Richard Weinberger
2018-08-29 11:16 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 13/25] ubifs: authentication: Add hashes to index nodes Sascha Hauer
2018-08-27 19:36 ` Richard Weinberger
2018-09-07 10:25 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 14/25] ubifs: Add authentication nodes to journal Sascha Hauer
2018-07-08 2:59 ` kbuild test robot
2018-08-27 20:48 ` Richard Weinberger
2018-08-29 14:38 ` Sascha Hauer
2018-08-29 14:54 ` Richard Weinberger
2018-08-30 13:41 ` Sascha Hauer
2018-09-02 19:45 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 15/25] ubifs: Add auth nodes to garbage collector journal head Sascha Hauer
2018-08-27 20:51 ` Richard Weinberger
2018-08-30 14:43 ` Sascha Hauer
2018-07-04 12:41 ` [PATCH 16/25] ubifs: authenticate replayed journal Sascha Hauer
2018-07-08 6:08 ` kbuild test robot
2018-08-27 21:16 ` Richard Weinberger
2018-07-04 12:41 ` [PATCH 17/25] ubifs: authentication: authenticate LPT Sascha Hauer
2018-07-04 12:41 ` [PATCH 18/25] ubfis: authentication: authenticate master node Sascha Hauer
2018-07-04 12:41 ` [PATCH 19/25] ubifs: Create hash for default LPT Sascha Hauer
2018-07-04 12:41 ` [PATCH 20/25] ubifs: authentication: Authenticate super block node Sascha Hauer
2018-07-04 12:41 ` [PATCH 21/25] ubifs: Add hashes and HMACs to default filesystem Sascha Hauer
2018-07-04 12:41 ` [PATCH 22/25] ubifs: do not update inode size in-place in authenticated mode Sascha Hauer
2018-07-04 12:41 ` [PATCH 23/25] ubifs: Enable authentication support Sascha Hauer
2018-07-04 12:41 ` [PATCH 24/25] ubifs: support offline signed images Sascha Hauer
2018-07-04 12:41 ` [PATCH 25/25] Documentation: ubifs: Add authentication whitepaper Sascha Hauer
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