[PATCH v2 3/5] btrfs-progs: lowmem check: Add dev_item check for used bytes and total bytes

[Qu Wenruo <wqu@suse.com>]

Obviously, used bytes can't be larger than total bytes.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 check/mode-lowmem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
index 07c03cad77af..1173b963b8f3 100644
--- a/check/mode-lowmem.c
+++ b/check/mode-lowmem.c
@@ -4074,6 +4074,11 @@ static int check_dev_item(struct btrfs_fs_info *fs_info,
 	used = btrfs_device_bytes_used(eb, dev_item);
 	total_bytes = btrfs_device_total_bytes(eb, dev_item);
 
+	if (used > total_bytes) {
+		error("device %llu has incorrect used bytes %llu > total bytes %llu",
+			dev_id, used, total_bytes);
+		return ACCOUNTING_MISMATCH;
+	}
 	key.objectid = dev_id;
 	key.type = BTRFS_DEV_EXTENT_KEY;
 	key.offset = 0;
-- 
2.19.1