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authorNicholas D Steeves <nsteeves@gmail.com>2016-04-23 00:41:30 +0100
committerNicholas D Steeves <nsteeves@gmail.com>2016-04-23 00:41:30 +0100
commitcec572daccafa1e912cbed363df6f84687778c6f (patch)
tree7d99ab9f73d25c1ed8eaf6393f6374edf5316b03 /uuid-tree.c
btrfs-progs (4.4.1-1.1) unstable; urgency=medium
* Non-maintainer upload. * New upstream release. * Rename package to btrfs-progs (Closes: #780081) * Update standards version to 3.9.7 (no changes needed). * debian/control: Add "Breaks" per Gianfranco Costamagna's suggestion * Change lintian override to reflect package rename * Switch from using postinst and postrm to using triggers per Christian Seiler's recommendation. # imported from the archive
Diffstat (limited to 'uuid-tree.c')
-rw-r--r--uuid-tree.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/uuid-tree.c b/uuid-tree.c
new file mode 100644
index 0000000..39c3f3f
--- /dev/null
+++ b/uuid-tree.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) STRATO AG 2013. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <uuid/uuid.h>
+#include <sys/ioctl.h>
+#include "ctree.h"
+#include "transaction.h"
+#include "disk-io.h"
+#include "print-tree.h"
+
+
+static void btrfs_uuid_to_key(const u8 *uuid, u64 *key_objectid,
+ u64 *key_offset)
+{
+ *key_objectid = get_unaligned_le64(uuid);
+ *key_offset = get_unaligned_le64(uuid + sizeof(u64));
+}
+
+
+/* return -ENOENT for !found, < 0 for errors, or 0 if an item was found */
+static int btrfs_uuid_tree_lookup_any(int fd, const u8 *uuid, u8 type,
+ u64 *subid)
+{
+ int ret;
+ u64 key_objectid = 0;
+ u64 key_offset;
+ struct btrfs_ioctl_search_args search_arg;
+ struct btrfs_ioctl_search_header *search_header;
+ u32 item_size;
+ __le64 lesubid;
+
+ btrfs_uuid_to_key(uuid, &key_objectid, &key_offset);
+
+ memset(&search_arg, 0, sizeof(search_arg));
+ search_arg.key.tree_id = BTRFS_UUID_TREE_OBJECTID;
+ search_arg.key.min_objectid = key_objectid;
+ search_arg.key.max_objectid = key_objectid;
+ search_arg.key.min_type = type;
+ search_arg.key.max_type = type;
+ search_arg.key.min_offset = key_offset;
+ search_arg.key.max_offset = key_offset;
+ search_arg.key.max_transid = (u64)-1;
+ search_arg.key.nr_items = 1;
+ ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_arg);
+ if (ret < 0) {
+ fprintf(stderr,
+ "ioctl(BTRFS_IOC_TREE_SEARCH, uuid, key %016llx, UUID_KEY, %016llx) ret=%d, error: %s\n",
+ (unsigned long long)key_objectid,
+ (unsigned long long)key_offset, ret, strerror(errno));
+ ret = -ENOENT;
+ goto out;
+ }
+
+ if (search_arg.key.nr_items < 1) {
+ ret = -ENOENT;
+ goto out;
+ }
+ search_header = (struct btrfs_ioctl_search_header *)(search_arg.buf);
+ item_size = search_header->len;
+ if ((item_size & (sizeof(u64) - 1)) || item_size == 0) {
+ printf("btrfs: uuid item with illegal size %lu!\n",
+ (unsigned long)item_size);
+ ret = -ENOENT;
+ goto out;
+ } else {
+ ret = 0;
+ }
+
+ /* return first stored id */
+ memcpy(&lesubid, search_header + 1, sizeof(lesubid));
+ *subid = le64_to_cpu(lesubid);
+
+out:
+ return ret;
+}
+
+int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id)
+{
+ return btrfs_uuid_tree_lookup_any(fd, uuid, BTRFS_UUID_KEY_SUBVOL,
+ subvol_id);
+}
+
+int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
+ u64 *subvol_id)
+{
+ return btrfs_uuid_tree_lookup_any(fd, uuid,
+ BTRFS_UUID_KEY_RECEIVED_SUBVOL,
+ subvol_id);
+}