Btrfs: use a cached state for extent state operations during delalloc

This changes the btrfs code to find delalloc ranges in the extent state
tree to use the new state caching code from set/test bit.  It reduces
one of the biggest causes of rbtree searches in the writeback path.

test_range_bit is also modified to take the cached state as a starting
point while searching.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index e494545c4202..3f8e93de2989 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1376,7 +1376,7 @@ again:
 
         /* already ordered? We're done */
         if (test_range_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
-                             EXTENT_ORDERED, 0)) {
+                             EXTENT_ORDERED, 0, NULL)) {
                 goto out;
         }
 
@@ -1417,7 +1417,7 @@ static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end)
         int ret;
 
         ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end,
-                             EXTENT_ORDERED, 0);
+                             EXTENT_ORDERED, 0, NULL);
         if (ret)
                 return 0;
 
@@ -1795,7 +1795,7 @@ static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
                 return 0;
 
         if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
-            test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1)) {
+            test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
                 clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM,
                                   GFP_NOFS);
                 return 0;