verity: remove special-case logic for the root node

dm-bht.h

 /*
  * Copyright (C) 2010 The Chromium OS Authors <chromium-os-dev@chromium.org>
  *
  * Device-Mapper block hash tree interface.
  * See Documentation/device-mapper/dm-bht.txt for details.
  *
  * This file is released under the GPLv2.
  */
 #ifndef __LINUX_DM_BHT_H
 #define __LINUX_DM_BHT_H
@@ skipping 82 matching lines @@
         /* Computed values */
         unsigned int node_count;  /* Data size (in hashes) for each entry */
         unsigned int node_count_shift;  /* first bit set - 1 */
         /* There is one per CPU so that verified can be simultaneous. */
         struct hash_desc *hash_desc;  /* Container for the hash alg */
         unsigned int digest_size;
         sector_t sectors;  /* Number of disk sectors used */
 
         /* bool verified;  Full tree is verified */
         u8 *root_digest;  /* hash_alg(levels[0].entries[*].nodes) */
-        atomic_t root_state; /* Uses UNALLOCATED, REQUESTED, and VERIFIED */
         struct dm_bht_level *levels;  /* in reverse order */
         mempool_t *entry_pool;
         /* Callbacks for reading and/or writing to the hash device */
         dm_bht_callback read_cb;
         dm_bht_callback write_cb;
 };
 
 /* Constructor for struct dm_bht instances. */
 int dm_bht_create(struct dm_bht *bht,
                   unsigned int block_count,
@@ skipping 21 matching lines @@
  */
 int dm_bht_compute(struct dm_bht *bht, void *read_cb_ctx);
 int dm_bht_sync(struct dm_bht *bht, void *write_cb_ctx);
 int dm_bht_store_block(struct dm_bht *bht, unsigned int block_index,
                        u8 *block_data);
 int dm_bht_zeroread_callback(void *ctx, sector_t start, u8 *dst, sector_t count,
                              struct dm_bht_entry *entry);
 void dm_bht_read_completed(struct dm_bht_entry *entry, int status);
 void dm_bht_write_completed(struct dm_bht_entry *entry, int status);
 #endif  /* __LINUX_DM_BHT_H */