summaryrefslogtreecommitdiffstats
path: root/src/btrfs.c
diff options
context:
space:
mode:
authorChristophe Grenier <grenier@cgsecurity.org>2011-03-05 18:40:22 +0100
committerChristophe Grenier <grenier@cgsecurity.org>2011-03-05 18:40:22 +0100
commitf2c0943a5a5d2de868a6cfefa8b2c7386b8c5393 (patch)
tree067af5958b2777c67cc7811390d04f0cdc2e0675 /src/btrfs.c
parent237b0d53ac0d638ccbd8671293b6695436bad32c (diff)
TestDisk: recover btrfs, a GPL-licensed copy-on-write file system for Linux.
Diffstat (limited to 'src/btrfs.c')
-rw-r--r--src/btrfs.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/src/btrfs.c b/src/btrfs.c
new file mode 100644
index 0000000..d99b8f4
--- /dev/null
+++ b/src/btrfs.c
@@ -0,0 +1,124 @@
+/*
+
+ File: btrfs.c
+
+ Copyright (C) 2011 Christophe GRENIER <grenier@cgsecurity.org>
+
+ This software is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ 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 the Free Software Foundation, Inc., 51
+ Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#include "types.h"
+#include "common.h"
+#include "btrfs.h"
+#include "fnctdsk.h"
+#include "log.h"
+#include "guid_cpy.h"
+
+static int set_btrfs_info(const struct btrfs_super_block *sb, partition_t *partition, const int verbose);
+static int test_btrfs(const struct btrfs_super_block *sb, partition_t *partition);
+
+int check_btrfs(disk_t *disk_car,partition_t *partition,const int verbose)
+{
+ unsigned char *buffer=(unsigned char*)MALLOC(BTRFS_SUPER_INFO_SIZE);
+ if(disk_car->pread(disk_car, buffer, BTRFS_SUPER_INFO_SIZE, partition->part_offset + BTRFS_SUPER_INFO_OFFSET) != BTRFS_SUPER_INFO_SIZE)
+ {
+ free(buffer);
+ return 1;
+ }
+ if(test_btrfs((struct btrfs_super_block*)buffer, partition)!=0)
+ {
+ free(buffer);
+ return 1;
+ }
+ set_btrfs_info((struct btrfs_super_block*)buffer, partition, verbose);
+ free(buffer);
+ return 0;
+}
+
+static int set_btrfs_info(const struct btrfs_super_block *sb, partition_t *partition, const int verbose)
+{
+ set_part_name(partition, sb->label, sizeof(partition->partname));
+ strncpy(partition->info,"btrfs",sizeof(partition->info));
+ if(le64(sb->bytenr)!=partition->part_offset + BTRFS_SUPER_INFO_OFFSET)
+ {
+ strcat(partition->info," Backup superblock");
+ }
+ /* last mounted => date */
+ return 0;
+}
+
+/*
+Primary superblock is at 1024 (SUPERBLOCK_OFFSET)
+Group 0 begin at s_first_data_block
+*/
+int recover_btrfs(disk_t *disk, const struct btrfs_super_block *sb, partition_t *partition, const int verbose, const int dump_ind)
+{
+ if(test_btrfs(sb, partition)!=0)
+ return 1;
+ if(dump_ind!=0)
+ {
+ if(partition!=NULL && disk!=NULL)
+ log_info("\nbtrfs magic value at %u/%u/%u\n",
+ offset2cylinder(disk,partition->part_offset),
+ offset2head(disk,partition->part_offset),
+ offset2sector(disk,partition->part_offset));
+ dump_log(sb, BTRFS_SUPER_INFO_SIZE);
+ }
+ if(partition==NULL)
+ return 0;
+ set_btrfs_info(sb, partition, verbose);
+ partition->part_type_i386=P_LINUX;
+ partition->part_type_mac=PMAC_LINUX;
+ partition->part_type_sun=PSUN_LINUX;
+ partition->part_type_gpt=GPT_ENT_TYPE_LINUX_DATA;
+ partition->part_size=(uint64_t)le64(sb->dev_item.total_bytes);
+ partition->blocksize=le32(sb->dev_item.sector_size);
+ guid_cpy(&partition->part_uuid, (const efi_guid_t *)&sb->fsid);
+ if(verbose>0)
+ {
+ log_info("\n");
+ }
+ partition->sborg_offset=BTRFS_SUPER_INFO_OFFSET;
+ partition->sb_size=BTRFS_SUPER_INFO_SIZE;
+ if(verbose>0)
+ {
+ if(disk==NULL)
+ log_info("recover_btrfs: part_size %lu\n", (long unsigned)(partition->part_size / le32(sb->dev_item.sector_size)));
+ else
+ log_info("recover_btrfs: part_size %lu\n", (long unsigned)(partition->part_size / disk->sector_size));
+ }
+ return 0;
+}
+
+static int test_btrfs(const struct btrfs_super_block *sb, partition_t *partition)
+{
+ if(memcmp(&sb->magic, BTRFS_MAGIC, 8)!=0)
+ return 1;
+ if(le32(sb->dev_item.sector_size)==0)
+ return 1;
+ partition->upart_type=UP_BTRFS;
+ return 0;
+}