From:   Qu Wenruo <wqu@suse.com>
To:     linux-btrfs@vger.kernel.org
Cc:     Su Yue <suy.fnst@cn.fujitsu.com>
Subject: [PATCH 07/13] btrfs-progs: lowmem: delete unaligned bytes extent data under repair
Date:   Tue, 18 Dec 2018 18:46:40 +0800
Message-Id: <20181218104646.29599-8-wqu@suse.com>
In-Reply-To: <20181218104646.29599-1-wqu@suse.com>
References: <20181218104646.29599-1-wqu@suse.com>
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From: Su Yue <suy.fnst@cn.fujitsu.com>

If found a extent data item has unaligned part, lowmem repair
just deletes it.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 check/mode-lowmem.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
index c6255334fc07..3cb3d4634e29 100644
--- a/check/mode-lowmem.c
+++ b/check/mode-lowmem.c
@@ -3036,6 +3036,7 @@ out:
 }
 
 /*
+ * If @err contains BYTES_UNALIGNED then delete the extent data item.
  * If @err contains BACKREF_MISSING then add extent of the
  * file_extent_data_item.
  *
@@ -3087,6 +3088,13 @@ static int repair_extent_data_item(struct btrfs_root *root,
 	else
 		parent = 0;
 
+	if (err & BYTES_UNALIGNED) {
+		ret = delete_item(root, pathp);
+		if (!ret)
+			err = 0;
+		goto out;
+	}
+
 	/* now repair only adds backref */
 	if ((err & BACKREF_MISSING) == 0)
 		return err;
-- 
2.20.0