volume_id: add btrfs

diff --git a/extras/volume_id/lib/Makefile.am b/extras/volume_id/lib/Makefile.am
index 0b0c80ba21c00cdbcae747e5a6b0773b00b7f3ae..678e44ec1cad4032347bfa4fd7ff36c6f9d76925 100644 (file)
--- 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 (file)
index 0000000..aae2fa6
--- /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 3326bf371289d16b39f6720374b6689f1d2071e8..356d899209b35573a5baa79e15ca34d3b86611af 100644 (file)
--- 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 9b7d91d11da786ac2885f6628dd185e4870b053e..c9ad02b9ae1d5c2e6ea519391881fba298e8fe34 100644 (file)
--- 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 */