2 files changed, 9 insertions, 0 deletions
diff --git a/disk-io.c b/disk-io.c
index 4a609a89..1caa7cd0 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -1125,6 +1125,9 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
 	if (flags & OPEN_CTREE_TEMPORARY_SUPER)
 		sbflags = SBREAD_TEMPORARY;
 
+	if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
+		sbflags |= SBREAD_IGNORE_FSID_MISMATCH;
+
 	ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
 			(flags & OPEN_CTREE_NO_DEVICES));
 	if (ret)
diff --git a/disk-io.h b/disk-io.h
index fefdb0a7..b4a1b104 100644
--- a/disk-io.h
+++ b/disk-io.h
@@ -100,6 +100,12 @@ enum btrfs_read_sb_flags {
 	 * SBREAD_RECOVER
 	 */
 	SBREAD_TEMPORARY = (1 << 1),
+
+	/*
+	 * Equivalent of OPEN_CTREE_IGNORE_FSID_MISMATCH, allow to read
+	 * superblock that has mismatched sb::fsid and sb::dev_item.fsid
+	 */
+	SBREAD_IGNORE_FSID_MISMATCH = (1 << 2),
 };
 
 /*