mdadm/0113-Dump-get-stat-from-a-wrong-metadata-file-when-restor.patch

From 75562b57d43bd252399b55d0004b8eac4b337a67 Mon Sep 17 00:00:00 2001
From: Lidong Zhong <lidong.zhong@suse.com>
Date: Mon, 14 Dec 2020 22:51:33 +0800
Subject: [PATCH 2/2] Dump: get stat from a wrong metadata file when restoring
 metadata
Git-commit: 75562b57d43bd252399b55d0004b8eac4b337a67
References: jsc#SLE-13700

The dumped metadata files are shown as below
localhost:~ # ll -ih test/
total 16K
34565564 -rw-r--r-- 2 root root 1.0G Dec 14 21:15
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-3
34565563 -rw-r--r-- 2 root root 1.0G Dec 14 21:15
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-4
34565563 -rw-r--r-- 2 root root 1.0G Dec 14 21:15 sda
34565564 -rw-r--r-- 2 root root 1.0G Dec 14 21:15 sdb

It reports such error when trying to restore metadata for /dev/sda
localhost:~ # mdadm --restore=test /dev/sda
Mdadm: test/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-4 is not the same
size as /dev/sda - cannot restore.
It's because the stb value has been changed to other metadata file in
the while statement.

Signed-off-by: Lidong Zhong <lidong.zhong@suse.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 Dump.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Dump.c b/Dump.c
index 38e8f23..736bcb6 100644
--- a/Dump.c
+++ b/Dump.c
@@ -272,6 +272,11 @@ int Restore_metadata(char *dev, char *dir, struct context *c,
 		       fname);
 		goto err;
 	}
+	if (stat(fname, &stb) != 0) {
+		pr_err("Could not stat %s for --restore.\n",
+		       fname);
+		goto err;
+	}
 	if (((unsigned long long)stb.st_size) != size) {
 		pr_err("%s is not the same size as %s - cannot restore.\n",
 		       fname, dev);
-- 
2.26.2