diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 7d3bc3fb88317167ff0b41022d43dc5581715609..7f01f3d2ac3bc17ebc58086ad4c146459824b9f0 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -253,7 +253,7 @@ static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
ubifs_assert(fname_len(&nm) == 0);
ubifs_assert(fname_name(&nm) == NULL);
dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
- err = ubifs_tnc_lookup(c, &key, dent);
+ err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
} else {
dent_key_init(c, &key, dir->i_ino, &nm);
err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
@@ -628,7 +628,10 @@ static int ubifs_readdir(struct file *file, struct dir_context *ctx)
if (encrypted) {
fstr.len = fstr_real_len;
- err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, &dent->key), 0, &nm.disk_name, &fstr);
+ err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c,
+ &dent->key),
+ le32_to_cpu(dent->cookie),
+ &nm.disk_name, &fstr);
if (err)
goto out;
} else {
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index f2b989dbe25affd89b93800d3a34ff072e057e94..0698cccc62239c9795fc55a0afb8241ec94193c9 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -78,7 +78,6 @@ static inline void zero_ino_node_unused(struct ubifs_ino_node *ino)
static inline void zero_dent_node_unused(struct ubifs_dent_node *dent)
{
dent->padding1 = 0;
- memset(dent->padding2, 0, 4);
}
/**
diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index 0d751297873e8d775c9456ff7a871ec17d4d5211..1bba4c8b5d3d782300bc94dc3dc874b959f9e914 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -1783,7 +1783,7 @@ int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu)
* @node: the node is returned here
* @nm: node name
*
- * This function look up and reads a node which contains name hash in the key.
+ * This function looks up and reads a node which contains name hash in the key.
* Since the hash may have collisions, there may be many nodes with the same
* key, so we have to sequentially look to all of them until the needed one is
* found. This function returns zero in case of success, %-ENOENT if the node
@@ -1831,7 +1831,7 @@ static int do_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
* @node: the node is returned here
* @nm: node name
*
- * This function look up and reads a node which contains name hash in the key.
+ * This function looks up and reads a node which contains name hash in the key.
* Since the hash may have collisions, there may be many nodes with the same
* key, so we have to sequentially look to all of them until the needed one is
* found. This function returns zero in case of success, %-ENOENT if the node
@@ -1859,9 +1859,95 @@ int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
* Unluckily, there are hash collisions and we have to iterate over
* them look at each direntry with colliding name hash sequentially.
*/
+
return do_lookup_nm(c, key, node, nm);
}
+static int do_lookup_dh(struct ubifs_info *c, const union ubifs_key *key,
+ struct ubifs_dent_node *dent, uint32_t cookie)
+{
+ int n, err, type = key_type(c, key);
+ struct ubifs_znode *znode;
+ struct ubifs_zbranch *zbr;
+ union ubifs_key *dkey, start_key;
+
+ ubifs_assert(is_hash_key(c, key));
+
+ lowest_dent_key(c, &start_key, key_inum(c, key));
+
+ mutex_lock(&c->tnc_mutex);
+ err = ubifs_lookup_level0(c, &start_key, &znode, &n);
+ if (unlikely(err < 0))
+ goto out_unlock;
+
+ for (;;) {
+ if (!err) {
+ err = tnc_next(c, &znode, &n);
+ if (err)
+ goto out_unlock;
+ }
+
+ zbr = &znode->zbranch[n];
+ dkey = &zbr->key;
+
+ if (key_inum(c, dkey) != key_inum(c, key) ||
+ key_type(c, dkey) != type) {
+ err = -ENOENT;
+ goto out_unlock;
+ }
+
+ err = tnc_read_hashed_node(c, zbr, dent);
+ if (err)
+ goto out_unlock;
+
+ if (key_hash(c, key) == key_hash(c, dkey) &&
+ le32_to_cpu(dent->cookie) == cookie)
+ goto out_unlock;
+ }
+
+out_unlock:
+ mutex_unlock(&c->tnc_mutex);
+ return err;
+}
+
+/**
+ * ubifs_tnc_lookup_dh - look up a "double hashed" node.
+ * @c: UBIFS file-system description object
+ * @key: node key to lookup
+ * @node: the node is returned here
+ * @cookie: node cookie for collision resolution
+ *
+ * This function looks up and reads a node which contains name hash in the key.
+ * Since the hash may have collisions, there may be many nodes with the same
+ * key, so we have to sequentially look to all of them until the needed one
+ * with the same cookie value is found.
+ * This function returns zero in case of success, %-ENOENT if the node
+ * was not found, and a negative error code in case of failure.
+ */
+int ubifs_tnc_lookup_dh(struct ubifs_info *c, const union ubifs_key *key,
+ void *node, uint32_t cookie)
+{
+ int err;
+ const struct ubifs_dent_node *dent = node;
+
+ /*
+ * We assume that in most of the cases there are no name collisions and
+ * 'ubifs_tnc_lookup()' returns us the right direntry.
+ */
+ err = ubifs_tnc_lookup(c, key, node);
+ if (err)
+ return err;
+
+ if (le32_to_cpu(dent->cookie) == cookie)
+ return 0;
+
+ /*
+ * Unluckily, there are hash collisions and we have to iterate over
+ * them look at each direntry with colliding name hash sequentially.
+ */
+ return do_lookup_dh(c, key, node, cookie);
+}
+
/**
* correct_parent_keys - correct parent znodes' keys.
* @c: UBIFS file-system description object
diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h
index e46331dcca4c002fff2250dc8fda35c3161e8440..249124d9a801c91a533c6c35c106321f4a0bc83d 100644
--- a/fs/ubifs/ubifs-media.h
+++ b/fs/ubifs/ubifs-media.h
@@ -530,7 +530,8 @@ struct ubifs_ino_node {
* @padding1: reserved for future, zeroes
* @type: type of the target inode (%UBIFS_ITYPE_REG, %UBIFS_ITYPE_DIR, etc)
* @nlen: name length
- * @padding2: reserved for future, zeroes
+ * @cookie: A 32bits random number, used to construct a 64bits
+ * identifier.
* @name: zero-terminated name
*
* Note, do not forget to amend 'zero_dent_node_unused()' function when
@@ -543,7 +544,7 @@ struct ubifs_dent_node {
__u8 padding1;
__u8 type;
__le16 nlen;
- __u8 padding2[4]; /* Watch 'zero_dent_node_unused()' if changing! */
+ __le32 cookie;
__u8 name[];
} __packed;
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 8ccd19257a810897cc3881e853319df2972357ef..a80610758543a43ea1e5a9c5db72ac7b8d19cc3e 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1571,6 +1571,8 @@ int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key,
struct ubifs_znode **zn, int *n);
int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
void *node, const struct fscrypt_name *nm);
+int ubifs_tnc_lookup_dh(struct ubifs_info *c, const union ubifs_key *key,
+ void *node, uint32_t secondary_hash);
int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key,
void *node, int *lnum, int *offs);
int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,