Btrfs: Fixes for 2.6.18 enterprise kernels
2.6.18 seems to get caught in an infinite loop when
cancel_rearming_delayed_workqueue is called more than once, so this switches
to cancel_delayed_work, which is arguably more correct.
Also, balance_dirty_pages can run into problems with 2.6.18 based kernels
because it doesn't have the per-bdi dirty limits. This avoids calling
balance_dirty_pages on the btree inode unless there is actually something
to balance, which is a good optimization in general.
Finally there's a compile fix for ordered-data.h
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e35e701..fabc31b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1548,6 +1548,7 @@
btrfs_commit_transaction(trans, root);
ret = btrfs_write_and_wait_transaction(NULL, root);
BUG_ON(ret);
+
write_ctree_super(NULL, root);
mutex_unlock(&fs_info->fs_mutex);
@@ -1583,17 +1584,17 @@
extent_io_tree_empty_lru(&fs_info->extent_ins);
extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
- flush_workqueue(end_io_workqueue);
flush_workqueue(async_submit_workqueue);
+ flush_workqueue(end_io_workqueue);
truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
- flush_workqueue(end_io_workqueue);
- destroy_workqueue(end_io_workqueue);
-
flush_workqueue(async_submit_workqueue);
destroy_workqueue(async_submit_workqueue);
+ flush_workqueue(end_io_workqueue);
+ destroy_workqueue(end_io_workqueue);
+
iput(fs_info->btree_inode);
#if 0
while(!list_empty(&fs_info->hashers)) {
@@ -1663,8 +1664,21 @@
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
{
- balance_dirty_pages_ratelimited_nr(
+ struct extent_io_tree *tree;
+ u64 num_dirty;
+ u64 start = 0;
+ unsigned long thresh = 16 * 1024 * 1024;
+ tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
+
+ if (current_is_pdflush())
+ return;
+
+ num_dirty = count_range_bits(tree, &start, (u64)-1,
+ thresh, EXTENT_DIRTY);
+ if (num_dirty > thresh) {
+ balance_dirty_pages_ratelimited_nr(
root->fs_info->btree_inode->i_mapping, 1);
+ }
}
void btrfs_set_buffer_defrag(struct extent_buffer *buf)