btrfs: remove unused btrfs_root::defrag_trans_start

Last touched in 2013 by commit de78b51a2852 ("btrfs: remove cache only
arguments from defrag path") that was the only code that used the value.
Now it's only set but never used for anything, so we can remove it.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a9cf11f..033e411 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1075,7 +1075,6 @@ struct btrfs_root {
 
        u64 highest_objectid;
 
-       u64 defrag_trans_start;
        struct btrfs_key defrag_progress;
        struct btrfs_key defrag_max;
 

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b5b7055..dbf90cd 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1141,10 +1141,6 @@ static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
        memset(&root->root_key, 0, sizeof(root->root_key));
        memset(&root->root_item, 0, sizeof(root->root_item));
        memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
-       if (!dummy)
-               root->defrag_trans_start = fs_info->generation;
-       else
-               root->defrag_trans_start = 0;
        root->root_key.objectid = objectid;
        root->anon_dev = 0;
 

diff --git a/fs/btrfs/tree-defrag.c b/fs/btrfs/tree-defrag.c
index 16c3a6d..d3f28b8 100644 (file)
--- a/fs/btrfs/tree-defrag.c
+++ b/fs/btrfs/tree-defrag.c
@@ -133,10 +133,9 @@ out:
                ret = 0;
        }
 done:
-       if (ret != -EAGAIN) {
+       if (ret != -EAGAIN)
                memset(&root->defrag_progress, 0,
                       sizeof(root->defrag_progress));
-               root->defrag_trans_start = trans->transid;
-       }
+
        return ret;
 }