The function is used to determine whether the subvolume is intact.
Signed-off-by: Lu Fengqi <lufq.fnst@xxxxxxxxxxxxxx>
---
V3:
add SPDX-License-Identifier;
pass btrfs_fs_info instead of btrfs_root;
use btrfs_read_fs_root instead of manually search;
remove empty header file.
Makefile | 3 ++-
undelete-subvol.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+), 1 deletion(-)
create mode 100644 undelete-subvol.c
diff --git a/Makefile b/Makefile
index cbd855336b2f..6a425e3a65dd 100644
--- a/Makefile
+++ b/Makefile
@@ -116,7 +116,8 @@ objects = ctree.o disk-io.o kernel-lib/radix-tree.o extent-tree.o print-tree.o \
qgroup.o free-space-cache.o kernel-lib/list_sort.o props.o \
kernel-shared/ulist.o qgroup-verify.o backref.o string-table.o task-utils.o \
inode.o file.o find-root.o free-space-tree.o help.o send-dump.o \
- fsfeatures.o kernel-lib/tables.o kernel-lib/raid56.o transaction.o
+ fsfeatures.o kernel-lib/tables.o kernel-lib/raid56.o transaction.o \
+ undelete-subvol.o
cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
cmds-inspect.o cmds-balance.o cmds-send.o cmds-receive.o \
cmds-quota.o cmds-qgroup.o cmds-replace.o check/main.o \
diff --git a/undelete-subvol.c b/undelete-subvol.c
new file mode 100644
index 000000000000..26e156092011
--- /dev/null
+++ b/undelete-subvol.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Fujitsu. All rights reserved.
+ */
+
+#include "ctree.h"
+#include "disk-io.h"
+
+/*
+ * Determines whether the subvolume is intact, according to the drop_progress
+ * of the root item specified by @subvol_id.
+ *
+ * Return true if the subvolume is intact, otherwise return false.
+ */
+static bool is_subvol_intact(struct btrfs_fs_info *fs_info, u64 subvol_id)
+{
+ struct btrfs_key key;
+ struct btrfs_root *root;
+
+ key.objectid = subvol_id;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = -1;
+
+ root = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(root))
+ return false;
+
+ /* the subvolume is intact if the objectid of drop_progress == 0 */
+ return !btrfs_disk_key_objectid(&root->root_item.drop_progress);
+}
--
2.17.0
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