The function will traverse the all orphan items on the tree root, and
recover the all intact subvolumes.
Signed-off-by: Lu Fengqi <lufq.f...@cn.fujitsu.com>
---
undelete-subvol.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
undelete-subvol.h | 2 ++
2 files changed, 62 insertions(+)
diff --git a/undelete-subvol.c b/undelete-subvol.c
index 9243e35545c5..b0852510a5c2 100644
--- a/undelete-subvol.c
+++ b/undelete-subvol.c
@@ -15,6 +15,7 @@
#include "transaction.h"
#include "disk-io.h"
#include "messages.h"
+#include "undelete-subvol.h"
/*
* Determines whether the subvolume is intact, according to the drop_progress
@@ -182,3 +183,62 @@ static int link_subvol_to_lostfound(struct btrfs_root
*root, u64 subvol_id)
out:
return ret;
}
+
+/*
+ * Traverse all orphan items on the root tree, restore them to the lost+found
+ * directory if the corresponding subvolumes are still intact left on the disk.
+ *
+ * @root the root of the root tree.
+ *
+ * Return 0 if no error occurred.
+ */
+int btrfs_undelete_intact_subvols(struct btrfs_root *root)
+{
+ struct btrfs_key key;
+ struct btrfs_path path;
+ u64 found_count = 0;
+ u64 recovered_count = 0;
+ int ret;
+
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ key.type = BTRFS_ORPHAN_ITEM_KEY;
+ key.offset = (u64)-1;
+
+ btrfs_init_path(&path);
+ while (1) {
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0) {
+ error("search ORPHAN_ITEM for %llu failed.\n",
+ key.offset);
+ break;
+ }
+
+ path.slots[0]--;
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+
+ /* No more BTRFS_ORPHAN_ITEM, so we don't need to continue. */
+ if (key.type != BTRFS_ORPHAN_ITEM_KEY) {
+ ret = 0;
+ break;
+ }
+
+ if (is_subvol_intact(root, key.offset)) {
+ /* Here we can confirm there is an intact subvolume. */
+ found_count++;
+ ret = link_subvol_to_lostfound(root, key.offset);
+ if (ret == 0) {
+ recovered_count++;
+ printf(
+ "Recovered subvolume %llu to lost+found successfully.\n",
+ key.offset);
+ }
+ }
+
+ btrfs_release_path(&path);
+ }
+
+ printf("Found %llu subvols left intact\n", found_count);
+ printf("Recovered %llu subvols\n", found_count);
+ btrfs_release_path(&path);
+ return ret;
+}
diff --git a/undelete-subvol.h b/undelete-subvol.h
index 7cfd100cce37..5ceb034beaf3 100644
--- a/undelete-subvol.h
+++ b/undelete-subvol.h
@@ -14,4 +14,6 @@
#ifndef __BTRFS_UNDELETE_SUBVOLUME_H__
#define __BTRFS_UNDELETE_SUBVOLUME_H__
+int btrfs_undelete_intact_subvols(struct btrfs_root *root);
+
#endif
--
2.16.1
--
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