ubifs: Add hashes to the tree node cache

As part of the UBIFS authentication support every branch in the index
gets a hash covering the referenced node. To make that happen the tree
node cache needs hashes over the nodes. This patch adds a hash argument
to ubifs_tnc_add() and ubifs_tnc_add_nm(). The hashes are calculated
from the callers of these functions which actually prepare the nodes.
With this patch all the leaf nodes of the index tree get hashes, but
currently nothing is done with these hashes, this is left for a later
patch.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 8 insertions, 2 deletions

diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index 8502c07c1e0a..bb5f989a6e06 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -2260,13 +2260,14 @@ do_split:
  * @lnum: LEB number of node
  * @offs: node offset
  * @len: node length
+ * @hash: The hash over the node
  *
  * This function adds a node with key @key to TNC. The node may be new or it may
  * obsolete some existing one. Returns %0 on success or negative error code on
  * failure.
  */
 int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,
-                  int offs, int len)
+                  int offs, int len, const u8 *hash)
 {
         int found, n, err = 0;
         struct ubifs_znode *znode;
@@ -2281,6 +2282,7 @@ int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,
                 zbr.lnum = lnum;
                 zbr.offs = offs;
                 zbr.len = len;
+                ubifs_copy_hash(c, hash, zbr.hash);
                 key_copy(c, key, &zbr.key);
                 err = tnc_insert(c, znode, &zbr, n + 1);
         } else if (found == 1) {
@@ -2291,6 +2293,7 @@ int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,
                 zbr->lnum = lnum;
                 zbr->offs = offs;
                 zbr->len = len;
+                ubifs_copy_hash(c, hash, zbr->hash);
         } else
                 err = found;
         if (!err)
@@ -2392,13 +2395,14 @@ out_unlock:
  * @lnum: LEB number of node
  * @offs: node offset
  * @len: node length
+ * @hash: The hash over the node
  * @nm: node name
  *
  * This is the same as 'ubifs_tnc_add()' but it should be used with keys which
  * may have collisions, like directory entry keys.
  */
 int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
-                     int lnum, int offs, int len,
+                     int lnum, int offs, int len, const u8 *hash,
                      const struct fscrypt_name *nm)
 {
         int found, n, err = 0;
@@ -2441,6 +2445,7 @@ int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
                         zbr->lnum = lnum;
                         zbr->offs = offs;
                         zbr->len = len;
+                        ubifs_copy_hash(c, hash, zbr->hash);
                         goto out_unlock;
                 }
         }
@@ -2452,6 +2457,7 @@ int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
                 zbr.lnum = lnum;
                 zbr.offs = offs;
                 zbr.len = len;
+                ubifs_copy_hash(c, hash, zbr.hash);
                 key_copy(c, key, &zbr.key);
                 err = tnc_insert(c, znode, &zbr, n + 1);
                 if (err)