Btrfs: Throttle less often waiting for snapshots to delete

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

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 58bceee..74bcd48 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2535,6 +2535,10 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
                                                root_gen, 0, 0, 1);
                        BUG_ON(ret);
                        mutex_unlock(&root->fs_info->alloc_mutex);
+
+                       atomic_inc(&root->fs_info->throttle_gen);
+                       wake_up(&root->fs_info->transaction_throttle);
+
                        continue;
                }
                /*
@@ -2603,7 +2607,6 @@ out:
        root_owner = btrfs_header_owner(parent);
        root_gen = btrfs_header_generation(parent);
 
-
        mutex_lock(&root->fs_info->alloc_mutex);
        ret = __btrfs_free_extent(trans, root, bytenr, blocksize,
                                  root_owner, root_gen, 0, 0, 1);
@@ -2726,7 +2729,6 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
                }
        }
        while(1) {
-               atomic_inc(&root->fs_info->throttle_gen);
                wret = walk_down_tree(trans, root, path, &level);
                if (wret > 0)
                        break;
@@ -2742,6 +2744,7 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
                        ret = -EAGAIN;
                        break;
                }
+               atomic_inc(&root->fs_info->throttle_gen);
                wake_up(&root->fs_info->transaction_throttle);
        }
        for (i = 0; i <= orig_level; i++) {

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 66af514..a687794 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -211,11 +211,9 @@ static void throttle_on_drops(struct btrfs_root *root)
 {
        struct btrfs_fs_info *info = root->fs_info;
 
-harder:
        if (atomic_read(&info->throttles)) {
                DEFINE_WAIT(wait);
                int thr;
-               int harder_count = 0;
                thr = atomic_read(&info->throttle_gen);
 
                do {
@@ -228,18 +226,6 @@ harder:
                        schedule();
                        finish_wait(&info->transaction_throttle, &wait);
                } while (thr == atomic_read(&info->throttle_gen));
-
-               if (harder_count < 5 &&
-                   info->total_ref_cache_size > 1 * 1024 * 1024) {
-                       harder_count++;
-                       goto harder;
-               }
-
-               if (harder_count < 10 &&
-                   info->total_ref_cache_size > 5 * 1024 * 1024) {
-                       harder_count++;
-                       goto harder;
-               }
        }
 }