ubifs: Add separate functions to init/crc a node
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>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index 099bec9..4bd61fe 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -365,6 +365,35 @@ static unsigned long long next_sqnum(struct ubifs_info *c)
return sqnum;
}
+void ubifs_init_node(struct ubifs_info *c, void *node, int len, int pad)
+{
+ struct ubifs_ch *ch = node;
+ unsigned long long sqnum = next_sqnum(c);
+
+ ubifs_assert(c, len >= UBIFS_CH_SZ);
+
+ ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC);
+ ch->len = cpu_to_le32(len);
+ ch->group_type = UBIFS_NO_NODE_GROUP;
+ ch->sqnum = cpu_to_le64(sqnum);
+ ch->padding[0] = ch->padding[1] = 0;
+
+ if (pad) {
+ len = ALIGN(len, 8);
+ pad = ALIGN(len, c->min_io_size) - len;
+ ubifs_pad(c, node + len, 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
@@ -378,25 +407,8 @@ static unsigned long long next_sqnum(struct ubifs_info *c)
*/
void ubifs_prepare_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);
-
- ubifs_assert(c, len >= UBIFS_CH_SZ);
-
- ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC);
- ch->len = cpu_to_le32(len);
- 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);
- pad = ALIGN(len, c->min_io_size) - len;
- ubifs_pad(c, node + len, pad);
- }
+ ubifs_init_node(c, node, len, pad);
+ ubifs_crc_node(c, node, len);
}
/**