Btrfs: reduce CPU usage in the extent_state tree

[deliverable/linux.git] / fs / btrfs / file.c

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 8a9c76aecdf30e3413512bd74ab7b09cbe51a3ff..ef66c3d989b9a967fe6cc431cc7bf23a58e6eff0 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -113,8 +113,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
        int err = 0;
        int i;
        struct inode *inode = fdentry(file)->d_inode;
-       struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
-       u64 hint_byte;
        u64 num_bytes;
        u64 start_pos;
        u64 end_of_last_block;
@@ -126,20 +124,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
                    root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
 
        end_of_last_block = start_pos + num_bytes - 1;
-
-       lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-       trans = btrfs_join_transaction(root, 1);
-       if (!trans) {
-               err = -ENOMEM;
-               goto out_unlock;
-       }
-       btrfs_set_trans_block_group(trans, inode);
-       hint_byte = 0;
-
-       /* check for reserved extents on each page, we don't want
-        * to reset the delalloc bit on things that already have
-        * extents reserved.
-        */
        btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
        for (i = 0; i < num_pages; i++) {
                struct page *p = pages[i];
@@ -154,9 +138,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
                 * at this time.
                 */
        }
-       err = btrfs_end_transaction(trans, root);
-out_unlock:
-       unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
        return err;
 }