From: Zhao Lei <zhaolei@cn.fujitsu.com>
Date: Tue, 17 Feb 2015 09:25:51 +0000 (+0800)
Subject: btrfs: Adjust commit-transaction condition to avoid NO_SPACE more
X-Git-Tag: firefly_0821_release~176^2~1735^2~43
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=264ca0f60becac34395f3b42171ad0cc2e53ea6e;p=firefly-linux-kernel-4.4.55.git

btrfs: Adjust commit-transaction condition to avoid NO_SPACE more

If we have any chance to make a successful write, we should not give up.

This patch adjust commit-transaction condition from:
  pinned >= wanted
to
  left + pinned >= wanted

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 7b227a65078c..01f4db6554a1 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3931,7 +3931,8 @@ alloc:
 		 * don't bother committing the transaction.
 		 */
 		if (percpu_counter_compare(&data_sinfo->total_bytes_pinned,
-					   bytes) < 0)
+					   used + bytes -
+					   data_sinfo->total_bytes) < 0)
 			have_pinned_space = 0;
 		spin_unlock(&data_sinfo->lock);