[PATCH 19/25] ubifs: Create hash for default LPT

[Sascha Hauer]

During creation of the default filesystem on an empty flash the default
LPT is created. With this patch a hash over the default LPT is
calculated which can be added to the default filesystems master node.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 fs/ubifs/lpt.c   | 13 ++++++++++++-
 fs/ubifs/sb.c    |  3 ++-
 fs/ubifs/ubifs.h |  2 +-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index 2c440bb31d69..c979d604f69d 100644
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -602,11 +602,12 @@ static int calc_pnode_num_from_parent(const struct ubifs_info *c,
  * @lpt_first: LEB number of first LPT LEB
  * @lpt_lebs: number of LEBs for LPT is passed and returned here
  * @big_lpt: use big LPT model is passed and returned here
+ * @hash: hash of the LPT is returned here
  *
  * This function returns %0 on success and a negative error code on failure.
  */
 int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
-			  int *lpt_lebs, int *big_lpt)
+			  int *lpt_lebs, int *big_lpt, u8 *hash)
 {
 	int lnum, err = 0, node_sz, iopos, i, j, cnt, len, alen, row;
 	int blnum, boffs, bsz, bcnt;
@@ -615,6 +616,7 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
 	void *buf = NULL, *p;
 	struct ubifs_lpt_lprops *ltab = NULL;
 	int *lsave = NULL;
+	struct shash_desc *desc;
 
 	err = calc_dflt_lpt_geom(c, main_lebs, big_lpt);
 	if (err)
@@ -628,6 +630,10 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
 	/* Needed by 'ubifs_pack_lsave()' */
 	c->main_first = c->leb_cnt - *main_lebs;
 
+	desc = ubifs_hash_get_desc(c);
+	if (IS_ERR(desc))
+		return PTR_ERR(desc);
+
 	lsave = kmalloc_array(c->lsave_cnt, sizeof(int), GFP_KERNEL);
 	pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_KERNEL);
 	nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_KERNEL);
@@ -675,6 +681,7 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
 
 	/* Add first pnode */
 	ubifs_pack_pnode(c, p, pnode);
+	ubifs_shash_update(c, desc, p, c->pnode_sz);
 	p += c->pnode_sz;
 	len = c->pnode_sz;
 	pnode->num += 1;
@@ -709,6 +716,7 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
 			len = 0;
 		}
 		ubifs_pack_pnode(c, p, pnode);
+		ubifs_shash_update(c, desc, p, c->pnode_sz);
 		p += c->pnode_sz;
 		len += c->pnode_sz;
 		/*
@@ -828,6 +836,8 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
 	if (err)
 		goto out;
 
+	ubifs_shash_final(c, desc, hash);
+
 	c->nhead_lnum = lnum;
 	c->nhead_offs = ALIGN(len, c->min_io_size);
 
@@ -851,6 +861,7 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
 		dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs);
 out:
 	c->ltab = NULL;
+	kfree(desc);
 	kfree(lsave);
 	vfree(ltab);
 	vfree(buf);
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 2fabd441d74a..155480f62fac 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -87,6 +87,7 @@ static int create_default_filesystem(struct ubifs_info *c)
 	__le64 tmp_le64;
 	__le32 tmp_le32;
 	struct timespec ts;
+	u8 hash_lpt[UBIFS_MAX_HASH_LEN];
 
 	/* Some functions called from here depend on the @c->key_len filed */
 	c->key_len = UBIFS_SK_LEN;
@@ -148,7 +149,7 @@ static int create_default_filesystem(struct ubifs_info *c)
 	c->lsave_cnt = DEFAULT_LSAVE_CNT;
 	c->max_leb_cnt = c->leb_cnt;
 	err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs,
-				    &big_lpt);
+				    &big_lpt, hash_lpt);
 	if (err)
 		return err;
 
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index a2805dec8aee..c5f15db915a9 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1886,7 +1886,7 @@ int ubifs_clear_orphans(struct ubifs_info *c);
 /* lpt.c */
 int ubifs_calc_lpt_geom(struct ubifs_info *c);
 int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
-			  int *lpt_lebs, int *big_lpt);
+			  int *lpt_lebs, int *big_lpt, u8 *hash);
 int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr);
 struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum);
 struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum);
-- 
2.18.0