mirror of
https://github.com/kdave/btrfs-progs
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ad280c1b3a
This commit adds UUID tree lookup methods that make use of the search ioctl. The code is based on the kernel code. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*
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* Copyright (C) STRATO AG 2013. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <uuid/uuid.h>
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#include <sys/ioctl.h>
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#include "ctree.h"
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#include "transaction.h"
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#include "disk-io.h"
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#include "print-tree.h"
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static void btrfs_uuid_to_key(const u8 *uuid, u64 *key_objectid,
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u64 *key_offset)
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{
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*key_objectid = get_unaligned_le64(uuid);
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*key_offset = get_unaligned_le64(uuid + sizeof(u64));
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}
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/* return -ENOENT for !found, < 0 for errors, or 0 if an item was found */
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static int btrfs_uuid_tree_lookup_any(int fd, const u8 *uuid, u8 type,
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u64 *subid)
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{
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int ret;
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u64 key_objectid = 0;
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u64 key_offset;
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struct btrfs_ioctl_search_args search_arg;
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struct btrfs_ioctl_search_header *search_header;
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u32 item_size;
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btrfs_uuid_to_key(uuid, &key_objectid, &key_offset);
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memset(&search_arg, 0, sizeof(search_arg));
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search_arg.key.tree_id = BTRFS_UUID_TREE_OBJECTID;
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search_arg.key.min_objectid = key_objectid;
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search_arg.key.max_objectid = key_objectid;
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search_arg.key.min_type = type;
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search_arg.key.max_type = type;
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search_arg.key.min_offset = key_offset;
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search_arg.key.max_offset = key_offset;
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search_arg.key.max_transid = (u64)-1;
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search_arg.key.nr_items = 1;
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ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_arg);
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if (ret < 0) {
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fprintf(stderr,
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"ioctl(BTRFS_IOC_TREE_SEARCH, uuid, key %016llx, UUID_KEY, %016llx) ret=%d, error: %s\n",
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(unsigned long long)key_objectid,
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(unsigned long long)key_offset, ret, strerror(errno));
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ret = -ENOENT;
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goto out;
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}
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if (search_arg.key.nr_items < 1) {
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ret = -ENOENT;
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goto out;
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}
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search_header = (struct btrfs_ioctl_search_header *)(search_arg.buf);
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item_size = search_header->len;
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if ((item_size & (sizeof(u64) - 1)) || item_size == 0) {
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printf("btrfs: uuid item with illegal size %lu!\n",
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(unsigned long)item_size);
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ret = -ENOENT;
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goto out;
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} else {
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ret = 0;
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}
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/* return first stored id */
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memcpy(subid, search_header + 1, sizeof(*subid));
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*subid = le64_to_cpu(*subid);
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out:
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return ret;
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}
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int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id)
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{
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return btrfs_uuid_tree_lookup_any(fd, uuid, BTRFS_UUID_KEY_SUBVOL,
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subvol_id);
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}
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int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
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u64 *subvol_id)
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{
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return btrfs_uuid_tree_lookup_any(fd, uuid,
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BTRFS_UUID_KEY_RECEIVED_SUBVOL,
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subvol_id);
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}
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