Btrfs: use token to avoid times mapping extent buffer

The API in tree log code has done sort of changes, and it proves that
we can benifit from using token, so do the same thing here.

function_graph tracer's timer shows that it costs nearly half time
of before(39.788us -> 22.391us).

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 35 insertions, 28 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 31a871ec48f2..280e4d487636 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2715,34 +2715,41 @@ static void fill_inode_item(struct btrfs_trans_handle *trans,
                             struct btrfs_inode_item *item,
                             struct inode *inode)
 {
-        btrfs_set_inode_uid(leaf, item, i_uid_read(inode));
-        btrfs_set_inode_gid(leaf, item, i_gid_read(inode));
-        btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size);
-        btrfs_set_inode_mode(leaf, item, inode->i_mode);
-        btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
-
-        btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
-                               inode->i_atime.tv_sec);
-        btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
-                                inode->i_atime.tv_nsec);
-
-        btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
-                               inode->i_mtime.tv_sec);
-        btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
-                                inode->i_mtime.tv_nsec);
-
-        btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
-                               inode->i_ctime.tv_sec);
-        btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
-                                inode->i_ctime.tv_nsec);
-
-        btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode));
-        btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation);
-        btrfs_set_inode_sequence(leaf, item, inode->i_version);
-        btrfs_set_inode_transid(leaf, item, trans->transid);
-        btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
-        btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
-        btrfs_set_inode_block_group(leaf, item, 0);
+        struct btrfs_map_token token;
+
+        btrfs_init_map_token(&token);
+
+        btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token);
+        btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token);
+        btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size,
+                                   &token);
+        btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token);
+        btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token);
+
+        btrfs_set_token_timespec_sec(leaf, btrfs_inode_atime(item),
+                                     inode->i_atime.tv_sec, &token);
+        btrfs_set_token_timespec_nsec(leaf, btrfs_inode_atime(item),
+                                      inode->i_atime.tv_nsec, &token);
+
+        btrfs_set_token_timespec_sec(leaf, btrfs_inode_mtime(item),
+                                     inode->i_mtime.tv_sec, &token);
+        btrfs_set_token_timespec_nsec(leaf, btrfs_inode_mtime(item),
+                                      inode->i_mtime.tv_nsec, &token);
+
+        btrfs_set_token_timespec_sec(leaf, btrfs_inode_ctime(item),
+                                     inode->i_ctime.tv_sec, &token);
+        btrfs_set_token_timespec_nsec(leaf, btrfs_inode_ctime(item),
+                                      inode->i_ctime.tv_nsec, &token);
+
+        btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode),
+                                     &token);
+        btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation,
+                                         &token);
+        btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token);
+        btrfs_set_token_inode_transid(leaf, item, trans->transid, &token);
+        btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token);
+        btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token);
+        btrfs_set_token_inode_block_group(leaf, item, 0, &token);
 }
 
 /*