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volume_id: add support for btrfs

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function                                             old     new   delta
volume_id_probe_btrfs                                  -      96     +96
fs2                                                   48      52      +4
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/0 up/down: 100/0)             Total: 100 bytes

Signed-off-by: Vladimir Dronnikov <dronnikov@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Vladimir Dronnikov 2009-11-01 23:05:09 +01:00 committed by Denys Vlasenko
parent e62a2463ec
commit 662e8b79d0
6 changed files with 114 additions and 1 deletions
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7
util-linux/Config.in
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@ -451,6 +451,13 @@ config FEATURE_VOLUMEID_EXT
help
TODO
config FEATURE_VOLUMEID_BTRFS
bool "btrfs filesystem"
default n
depends on VOLUMEID
help
TODO
config FEATURE_VOLUMEID_REISERFS
bool "Reiser filesystem"
default n

1
util-linux/volume_id/Kbuild
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@ -11,6 +11,7 @@ lib-$(CONFIG_FINDFS) += get_devname.o
lib-$(CONFIG_FEATURE_MOUNT_LABEL) += get_devname.o
lib-$(CONFIG_VOLUMEID) += volume_id.o util.o
lib-$(CONFIG_FEATURE_VOLUMEID_BTRFS) += btrfs.o
lib-$(CONFIG_FEATURE_VOLUMEID_EXT) += ext.o
lib-$(CONFIG_FEATURE_VOLUMEID_FAT) += fat.o
lib-$(CONFIG_FEATURE_VOLUMEID_HFS) += hfs.o

100
util-linux/volume_id/btrfs.c Normal file
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@ -0,0 +1,100 @@
/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2009 Vladimir Dronnikov <dronnikov@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "volume_id_internal.h"
#define BTRFS_UUID_SIZE 16
#define BTRFS_LABEL_SIZE 256
#define BTRFS_CSUM_SIZE 32
#define BTRFS_FSID_SIZE 16
#define BTRFS_MAGIC "_BHRfS_M"
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;
uint64_t generation;
uint64_t start_offset;
uint32_t dev_group;
uint8_t seek_speed;
uint8_t bandwidth;
uint8_t uuid[BTRFS_UUID_SIZE];
uint8_t fsid[BTRFS_UUID_SIZE];
} PACKED;
struct btrfs_super_block {
uint8_t csum[BTRFS_CSUM_SIZE];
uint8_t fsid[BTRFS_FSID_SIZE]; // UUID
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 log_root_transid;
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;
uint64_t chunk_root_generation;
uint64_t compat_flags;
uint64_t compat_ro_flags;
uint64_t incompat_flags;
uint16_t csum_type;
uint8_t root_level;
uint8_t chunk_root_level;
uint8_t log_root_level;
struct btrfs_dev_item dev_item;
uint8_t label[BTRFS_LABEL_SIZE]; // LABEL
// ...
} PACKED;
int volume_id_probe_btrfs(struct volume_id *id /*,uint64_t off*/)
{
#define off ((uint64_t) (64 * 1024))
struct btrfs_super_block *sb;
dbg("btrfs: probing at offset 0x%llx", (unsigned long long) off);
sb = volume_id_get_buffer(id, off, sizeof(*sb));
if (sb == NULL)
return -1;
if (memcmp(sb->magic, BTRFS_MAGIC, 8) != 0)
return -1;
// N.B.: btrfs supports 256-byte labels
volume_id_set_label_string(id, sb->label, VOLUME_ID_LABEL_SIZE);
volume_id_set_uuid(id, sb->fsid, UUID_DCE);
return 0;
}

2
util-linux/volume_id/get_devname.c
View File

@ -44,7 +44,7 @@ get_label_uuid(int fd, char **label, char **uuid)
if (vid->label[0] != '\0' || vid->uuid[0] != '\0') {
*label = xstrndup(vid->label, sizeof(vid->label));
*uuid = xstrndup(vid->uuid, sizeof(vid->uuid));
dbg("found label '%s', uuid '%s' on %s", *label, *uuid, device);
dbg("found label '%s', uuid '%s'", *label, *uuid);
rv = 0;
}
ret:

3
util-linux/volume_id/volume_id.c
View File

@ -109,6 +109,9 @@ static const probe_fptr fs2[] = {
#if ENABLE_FEATURE_VOLUMEID_EXT
volume_id_probe_ext,
#endif
#if ENABLE_FEATURE_VOLUMEID_BTRFS
volume_id_probe_btrfs,
#endif
#if ENABLE_FEATURE_VOLUMEID_REISERFS
volume_id_probe_reiserfs,
#endif

2
util-linux/volume_id/volume_id_internal.h
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@ -184,6 +184,8 @@ int volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t
/* FS */
int volume_id_probe_btrfs(struct volume_id *id /*,uint64_t off*/);
int volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/);
int volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/);