summaryrefslogtreecommitdiff
path: root/extras/volume_id
diff options
context:
space:
mode:
Diffstat (limited to 'extras/volume_id')
-rw-r--r--extras/volume_id/lib/Makefile.am3
-rw-r--r--extras/volume_id/lib/btrfs.c93
-rw-r--r--extras/volume_id/lib/libvolume_id-private.h1
-rw-r--r--extras/volume_id/lib/volume_id.c1
4 files changed, 97 insertions, 1 deletions
diff --git a/extras/volume_id/lib/Makefile.am b/extras/volume_id/lib/Makefile.am
index 0b0c80ba21..678e44ec1c 100644
--- a/extras/volume_id/lib/Makefile.am
+++ b/extras/volume_id/lib/Makefile.am
@@ -47,7 +47,8 @@ libvolume_id_la_SOURCES =\
vxfs.c \
squashfs.c \
netware.c \
- oracleasm.c
+ oracleasm.c \
+ btrfs.c
libvolume_id_la_LDFLAGS = \
-version-info $(VOLID_LT_CURRENT):$(VOLID_LT_REVISION):$(VOLID_LT_AGE) \
diff --git a/extras/volume_id/lib/btrfs.c b/extras/volume_id/lib/btrfs.c
new file mode 100644
index 0000000000..aae2fa616e
--- /dev/null
+++ b/extras/volume_id/lib/btrfs.c
@@ -0,0 +1,93 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This program 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <byteswap.h>
+
+#include "libvolume_id.h"
+#include "libvolume_id-private.h"
+
+struct btrfs_super_block {
+ uint8_t csum[32];
+ uint8_t fsid[16];
+ uint64_t bytenr;
+ uint64_t flags;
+ uint8_t magic[8];
+ uint64_t generation;
+ uint64_t root;
+ uint64_t chunk_root;
+ uint64_t log_root;
+ uint64_t total_bytes;
+ uint64_t bytes_used;
+ uint64_t root_dir_objectid;
+ uint64_t num_devices;
+ uint32_t sectorsize;
+ uint32_t nodesize;
+ uint32_t leafsize;
+ uint32_t stripesize;
+ uint32_t sys_chunk_array_size;
+ uint8_t root_level;
+ uint8_t chunk_root_level;
+ uint8_t log_root_level;
+ struct btrfs_dev_item {
+ uint64_t devid;
+ uint64_t total_bytes;
+ uint64_t bytes_used;
+ uint32_t io_align;
+ uint32_t io_width;
+ uint32_t sector_size;
+ uint64_t type;
+ uint32_t dev_group;
+ uint8_t seek_speed;
+ uint8_t bandwidth;
+ uint8_t uuid[16];
+ } PACKED dev_item;
+ uint8_t label[256];
+} PACKED;
+
+int volume_id_probe_btrfs(struct volume_id *id, uint64_t off, uint64_t size)
+{
+ const uint8_t *buf;
+ struct btrfs_super_block *bfs;
+
+ info("probing at offset 0x%llx, size 0x%llx\n",
+ (unsigned long long)off, (unsigned long long)size);
+
+ buf = volume_id_get_buffer(id, off + 0x4000, 0x200);
+ if (buf == NULL)
+ return -1;
+ bfs = (struct btrfs_super_block *)buf;
+ if (memcmp(bfs->magic, "_B9RfS_M", 8) != 0)
+ return -1;
+ volume_id_set_uuid(id, bfs->fsid, 0, UUID_DCE);
+ volume_id_set_label_raw(id, bfs->label, 256);
+ volume_id_set_label_string(id, bfs->label, 256);
+ volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+ id->type = "btrfs";
+ return 0;
+}
diff --git a/extras/volume_id/lib/libvolume_id-private.h b/extras/volume_id/lib/libvolume_id-private.h
index 3326bf3712..356d899209 100644
--- a/extras/volume_id/lib/libvolume_id-private.h
+++ b/extras/volume_id/lib/libvolume_id-private.h
@@ -155,6 +155,7 @@ extern int volume_id_probe_squashfs(struct volume_id *id, uint64_t off, uint64_t
extern int volume_id_probe_netware(struct volume_id *id, uint64_t off, uint64_t size);
extern int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size);
extern int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size);
+extern int volume_id_probe_btrfs(struct volume_id *id, uint64_t off, uint64_t size);
/* special formats */
extern int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off, uint64_t size);
diff --git a/extras/volume_id/lib/volume_id.c b/extras/volume_id/lib/volume_id.c
index 9b7d91d11d..c9ad02b9ae 100644
--- a/extras/volume_id/lib/volume_id.c
+++ b/extras/volume_id/lib/volume_id.c
@@ -83,6 +83,7 @@ static const struct prober prober_filesystem[] = {
{ volume_id_probe_squashfs, { "squashfs", } },
{ volume_id_probe_netware, { "netware", } },
{ volume_id_probe_oracleasm, { "oracleasm", } },
+ { volume_id_probe_btrfs, { "btrfs", } },
};
/* the user can overwrite this log function */