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-rw-r--r--fs/btrfs/ordered-data.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 157cc54..760c4a5 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -722,6 +722,7 @@ void btrfs_start_ordered_extent(struct inode *inode,
int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
{
int ret = 0;
+ int ret_wb = 0;
u64 end;
u64 orig_end;
struct btrfs_ordered_extent *ordered;
@@ -741,9 +742,14 @@ int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
if (ret)
return ret;
- ret = filemap_fdatawait_range(inode->i_mapping, start, orig_end);
- if (ret)
- return ret;
+ /*
+ * If we have a writeback error don't return immediately. Wait first
+ * for any ordered extents that haven't completed yet. This is to make
+ * sure no one can dirty the same page ranges and call writepages()
+ * before the ordered extents complete - to avoid failures (-EEXIST)
+ * when adding the new ordered extents to the ordered tree.
+ */
+ ret_wb = filemap_fdatawait_range(inode->i_mapping, start, orig_end);
end = orig_end;
while (1) {
@@ -767,7 +773,7 @@ int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
break;
end--;
}
- return ret;
+ return ret_wb ? ret_wb : ret;
}
/*
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