diff options
Diffstat (limited to 'extras')
| -rw-r--r-- | extras/volume_id/lib/Makefile.am | 3 | ||||
| -rw-r--r-- | extras/volume_id/lib/btrfs.c | 93 | ||||
| -rw-r--r-- | extras/volume_id/lib/libvolume_id-private.h | 1 | ||||
| -rw-r--r-- | extras/volume_id/lib/volume_id.c | 1 |
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 */ |