Btrfs: avoid tree log commit when there are no changes

[net-next-2.6.git] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ef399a7794ff3bd4cc32bd244ab02f92f3fec326..5b9567caba0a4e2eb8b457747db24ae36883ad49 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3480,6 +3480,7 @@ static noinline void init_btrfs_i(struct inode *inode)
        bi->generation = 0;
        bi->sequence = 0;
        bi->last_trans = 0;
+       bi->last_sub_trans = 0;
        bi->logged_trans = 0;
        bi->delalloc_bytes = 0;
        bi->reserved_bytes = 0;
@@ -4980,7 +4981,9 @@ again:
        set_page_dirty(page);
        SetPageUptodate(page);
 
-       BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
+       BTRFS_I(inode)->last_trans = root->fs_info->generation;
+       BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
+
        unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 
 out_unlock:
@@ -5100,6 +5103,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
        if (!ei)
                return NULL;
        ei->last_trans = 0;
+       ei->last_sub_trans = 0;
        ei->logged_trans = 0;
        ei->outstanding_extents = 0;
        ei->reserved_extents = 0;