[PATCH] reiserfs endianness: clone struct reiserfs_key

struct reiserfs_key cloned; (currently) identical struct in_core_key added.
Places that expect host-endian data in reiserfs_key switched to in_core_key.
Basically, we get annotation of reiserfs_key users and keep the resulting tree
obviously equivalent to original.

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/reiserfs/bitmap.c

@@ -736,7 +736,7 @@ static inline int this_blocknr_allocation_would_make_it_a_large_file(reiserfs_bl
 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
 static inline void displace_new_packing_locality (reiserfs_blocknr_hint_t *hint)
 {
-    struct reiserfs_key * key = &hint->key;
+    struct in_core_key * key = &hint->key;
 
     hint->th->displace_new_blocks = 0;
     hint->search_start = hint->beg + keyed_hash((char*)(&key->k_objectid),4) % (hint->end - hint->beg);
@@ -777,7 +777,7 @@ static inline int old_way (reiserfs_blocknr_hint_t * hint)
 
 static inline void hundredth_slices (reiserfs_blocknr_hint_t * hint)
 {
-    struct reiserfs_key * key = &hint->key;
+    struct in_core_key * key = &hint->key;
     b_blocknr_t slice_start;
 
     slice_start = (keyed_hash((char*)(&key->k_dir_id),4) % 100) * (hint->end / 100);

fs/reiserfs/stree.c

@@ -229,6 +229,7 @@ const struct reiserfs_key  MIN_KEY = {0, 0, {{0, 0},}};
 
 /* Maximal possible key. It is never in the tree. */
 const struct reiserfs_key  MAX_KEY = {0xffffffff, 0xffffffff, {{0xffffffff, 0xffffffff},}};
+const struct in_core_key  MAX_IN_CORE_KEY = {0xffffffff, 0xffffffff, {{0xffffffff, 0xffffffff},}};
 
 
 /* Get delimiting key of the buffer by looking for it in the buffers in the path, starting from the bottom

fs/reiserfs/super.c

@@ -110,7 +110,7 @@ static void reiserfs_unlockfs(struct super_block *s) {
   reiserfs_allow_writes(s) ;
 }
 
-extern const struct reiserfs_key  MAX_KEY;
+extern const struct in_core_key  MAX_IN_CORE_KEY;
 
 
 /* this is used to delete "save link" when there are no items of a
@@ -164,7 +164,7 @@ static int finish_unfinished (struct super_block * s)
  
     /* compose key to look for "save" links */
     max_cpu_key.version = KEY_FORMAT_3_5;
-    max_cpu_key.on_disk_key = MAX_KEY;
+    max_cpu_key.on_disk_key = MAX_IN_CORE_KEY;
     max_cpu_key.key_length = 3;
 
 #ifdef CONFIG_QUOTA

include/linux/reiserfs_fs.h

@@ -433,6 +433,23 @@ static inline void set_offset_v2_k_offset( struct offset_v2 *v2, loff_t offset )
 # define set_offset_v2_k_offset(v2,val) (offset_v2_k_offset(v2) = (val))
 #endif
 
+struct in_core_offset_v1 {
+    __u32 k_offset;
+    __u32 k_uniqueness;
+} __attribute__ ((__packed__));
+
+struct in_core_offset_v2 {
+#ifdef __LITTLE_ENDIAN
+	    /* little endian version */
+	    __u64 k_offset:60;
+	    __u64 k_type: 4;
+#else
+	    /* big endian version */
+	    __u64 k_type: 4;
+	    __u64 k_offset:60;
+#endif
+} __attribute__ ((__packed__));
+
 /* Key of an item determines its location in the S+tree, and
    is composed of 4 components */
 struct reiserfs_key {
@@ -445,9 +462,18 @@ struct reiserfs_key {
     } __attribute__ ((__packed__)) u;
 } __attribute__ ((__packed__));
 
+struct in_core_key {
+    __u32 k_dir_id;    /* packing locality: by default parent
+			  directory object id */
+    __u32 k_objectid;  /* object identifier */
+    union {
+	struct in_core_offset_v1 k_offset_v1;
+	struct in_core_offset_v2 k_offset_v2;
+    } __attribute__ ((__packed__)) u;
+} __attribute__ ((__packed__));
 
 struct cpu_key {
-    struct reiserfs_key on_disk_key;
+    struct in_core_key on_disk_key;
     int version;
     int key_length; /* 3 in all cases but direct2indirect and
 		       indirect2direct conversion */
@@ -1476,7 +1502,7 @@ struct tree_balance
   int fs_gen;                  /* saved value of `reiserfs_generation' counter
 			          see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */
 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
-  struct reiserfs_key  key;	      /* key pointer, to pass to block allocator or
+  struct in_core_key  key;	      /* key pointer, to pass to block allocator or
 				 another low-level subsystem */
 #endif
 } ;
@@ -2117,7 +2143,7 @@ struct buffer_head * get_FEB (struct tree_balance *);
  struct __reiserfs_blocknr_hint {
      struct inode * inode;		/* inode passed to allocator, if we allocate unf. nodes */
      long block;			/* file offset, in blocks */
-     struct reiserfs_key key;
+     struct in_core_key key;
      struct path * path;		/* search path, used by allocator to deternine search_start by
 					 * various ways */
      struct reiserfs_transaction_handle * th; /* transaction handle is needed to log super blocks and