[PATCH] reiserfs endianness: comp_short_keys() cleanup

comp_short_keys() massaged into sane form, which kills the last place where
pointer to in_core_key (or any object containing such) would be cast to or
from something else.  At that point we are free to change layout of
in_core_key - nothing depends on it anymore.

So we drop the mess with union in there and simply use (unconditional) __u64
k_offset and __u8 k_type instead; places using in_core_key switched to those.
That gives _far_ better code than current mess - on all platforms.

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>

1 files changed, 15 insertions, 21 deletions

diff --git a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c
index 15fa4cbdce3..da23ba75f3d 100644
--- a/fs/reiserfs/stree.c
+++ b/fs/reiserfs/stree.c
@@ -87,23 +87,20 @@ inline void copy_item_head(struct item_head * p_v_to,
 inline int  comp_short_keys (const struct reiserfs_key * le_key,
                              const struct cpu_key * cpu_key)
 {
-  __le32 * p_s_le_u32;
-  __u32 * p_s_cpu_u32;
-  int n_key_length = REISERFS_SHORT_KEY_LEN;
-
-  p_s_le_u32 = (__le32 *)le_key;
-  p_s_cpu_u32 = (__u32 *)&cpu_key->on_disk_key;
-  for( ; n_key_length--; ++p_s_le_u32, ++p_s_cpu_u32 ) {
-    if ( le32_to_cpu (*p_s_le_u32) < *p_s_cpu_u32 )
+  __u32 n;
+  n = le32_to_cpu(le_key->k_dir_id);
+  if (n < cpu_key->on_disk_key.k_dir_id)
       return -1;
-    if ( le32_to_cpu (*p_s_le_u32) > *p_s_cpu_u32 )
+  if (n > cpu_key->on_disk_key.k_dir_id)
+      return 1;
+  n = le32_to_cpu(le_key->k_objectid);
+  if (n < cpu_key->on_disk_key.k_objectid)
+      return -1;
+  if (n > cpu_key->on_disk_key.k_objectid)
       return 1;
-  }
-
   return 0;
 }
 
-
 /* k1 is pointer to on-disk structure which is stored in little-endian
    form. k2 is pointer to cpu variable.
    Compare keys using all 4 key fields.
@@ -153,18 +150,15 @@ inline int comp_short_le_keys (const struct reiserfs_key * key1, const struct re
 
 inline void le_key2cpu_key (struct cpu_key * to, const struct reiserfs_key * from)
 {
+    int version;
     to->on_disk_key.k_dir_id = le32_to_cpu (from->k_dir_id);
     to->on_disk_key.k_objectid = le32_to_cpu (from->k_objectid);
     
     // find out version of the key
-    to->version = le_key_version (from);
-    if (to->version == KEY_FORMAT_3_5) {
-        to->on_disk_key.u.k_offset_v1.k_offset = le32_to_cpu (from->u.k_offset_v1.k_offset);
-        to->on_disk_key.u.k_offset_v1.k_uniqueness = le32_to_cpu (from->u.k_offset_v1.k_uniqueness);
-    } else {
-        to->on_disk_key.u.k_offset_v2.k_offset = offset_v2_k_offset(&from->u.k_offset_v2);
-        to->on_disk_key.u.k_offset_v2.k_type = offset_v2_k_type(&from->u.k_offset_v2);
-    } 
+    version = le_key_version (from);
+    to->version = version;
+    to->on_disk_key.k_offset = le_key_k_offset(version, from);
+    to->on_disk_key.k_type = le_key_k_type(version, from);
 }
 
 
@@ -235,8 +229,8 @@ const struct reiserfs_key  MAX_KEY = {
         {{__constant_cpu_to_le32(0xffffffff),
         __constant_cpu_to_le32(0xffffffff)},}
 };
-const struct in_core_key  MAX_IN_CORE_KEY = {0xffffffff, 0xffffffff, {{0xffffffff, 0xffffffff},}};
 
+const struct in_core_key  MAX_IN_CORE_KEY = {~0U, ~0U, ~0ULL>>4, 15};
 
 /* Get delimiting key of the buffer by looking for it in the buffers in the path, starting from the bottom
    of the path, and going upwards.  We must check the path's validity at each step.  If the key is not in