Btrfs: increase the global block reserve estimates
When doing IO with large amounts of data fragmentation, the global block
reserve calulations are too low. This increases them to avoid
ENOSPC crashes.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index dc083f5..079e5a1 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4108,7 +4108,7 @@
num_bytes += div64_u64(data_used + meta_used, 50);
if (num_bytes * 3 > meta_used)
- num_bytes = div64_u64(meta_used, 3);
+ num_bytes = div64_u64(meta_used, 3) * 2;
return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10);
}