Btrfs: Add some simple throttling to wait for data=ordered and snapshot deletion
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 34cf1f1..e0940a3 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -631,6 +631,7 @@
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->sb = sb;
+ fs_info->throttles = 0;
fs_info->mount_opt = 0;
fs_info->max_extent = (u64)-1;
fs_info->delalloc_bytes = 0;
@@ -889,6 +890,12 @@
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
}
+void btrfs_throttle(struct btrfs_root *root)
+{
+ if (root->fs_info->throttles)
+ congestion_wait(WRITE, HZ/10);
+}
+
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
{
balance_dirty_pages_ratelimited_nr(