ubifs: Create hash for default LPT

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

3 files changed, 23 insertions, 3 deletions

diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index ee18305a6152..d1d5e96350dd 100644
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -604,11 +604,12 @@ 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;
@@ -617,6 +618,7 @@ 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)
@@ -630,6 +632,10 @@ 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);
@@ -677,6 +683,10 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
 
         /* Add first pnode */
         ubifs_pack_pnode(c, p, pnode);
+        err = ubifs_shash_update(c, desc, p, c->pnode_sz);
+        if (err)
+                goto out;
+
         p += c->pnode_sz;
         len = c->pnode_sz;
         pnode->num += 1;
@@ -711,6 +721,10 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
                         len = 0;
                 }
                 ubifs_pack_pnode(c, p, pnode);
+                err = ubifs_shash_update(c, desc, p, c->pnode_sz);
+                if (err)
+                        goto out;
+
                 p += c->pnode_sz;
                 len += c->pnode_sz;
                 /*
@@ -830,6 +844,10 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
         if (err)
                 goto out;
 
+        err = ubifs_shash_final(c, desc, hash);
+        if (err)
+                goto out;
+
         c->nhead_lnum = lnum;
         c->nhead_offs = ALIGN(len, c->min_io_size);
 
@@ -853,6 +871,7 @@ 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 7e08c8143316..572756579532 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 timespec64 ts;
+        u8 hash_lpt[UBIFS_HASH_ARR_SZ];
 
         /* 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 c26d3c600e4d..504b651b78f1 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1934,7 +1934,7 @@ 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);