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volume_id: add support for btrfs
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>
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@ -451,6 +451,13 @@ config FEATURE_VOLUMEID_EXT
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help
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TODO
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config FEATURE_VOLUMEID_BTRFS
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bool "btrfs filesystem"
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default n
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depends on VOLUMEID
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help
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TODO
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config FEATURE_VOLUMEID_REISERFS
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bool "Reiser filesystem"
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default n
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@ -11,6 +11,7 @@ lib-$(CONFIG_FINDFS) += get_devname.o
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lib-$(CONFIG_FEATURE_MOUNT_LABEL) += get_devname.o
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lib-$(CONFIG_VOLUMEID) += volume_id.o util.o
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lib-$(CONFIG_FEATURE_VOLUMEID_BTRFS) += btrfs.o
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lib-$(CONFIG_FEATURE_VOLUMEID_EXT) += ext.o
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lib-$(CONFIG_FEATURE_VOLUMEID_FAT) += fat.o
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lib-$(CONFIG_FEATURE_VOLUMEID_HFS) += hfs.o
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100
util-linux/volume_id/btrfs.c
Normal file
100
util-linux/volume_id/btrfs.c
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@ -0,0 +1,100 @@
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/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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* Copyright (C) 2009 Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "volume_id_internal.h"
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#define BTRFS_UUID_SIZE 16
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#define BTRFS_LABEL_SIZE 256
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#define BTRFS_CSUM_SIZE 32
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#define BTRFS_FSID_SIZE 16
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#define BTRFS_MAGIC "_BHRfS_M"
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struct btrfs_dev_item {
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uint64_t devid;
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uint64_t total_bytes;
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uint64_t bytes_used;
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uint32_t io_align;
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uint32_t io_width;
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uint32_t sector_size;
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uint64_t type;
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uint64_t generation;
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uint64_t start_offset;
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uint32_t dev_group;
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uint8_t seek_speed;
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uint8_t bandwidth;
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uint8_t uuid[BTRFS_UUID_SIZE];
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uint8_t fsid[BTRFS_UUID_SIZE];
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} PACKED;
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struct btrfs_super_block {
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uint8_t csum[BTRFS_CSUM_SIZE];
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uint8_t fsid[BTRFS_FSID_SIZE]; // UUID
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uint64_t bytenr;
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uint64_t flags;
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uint8_t magic[8];
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uint64_t generation;
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uint64_t root;
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uint64_t chunk_root;
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uint64_t log_root;
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uint64_t log_root_transid;
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uint64_t total_bytes;
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uint64_t bytes_used;
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uint64_t root_dir_objectid;
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uint64_t num_devices;
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uint32_t sectorsize;
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uint32_t nodesize;
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uint32_t leafsize;
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uint32_t stripesize;
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uint32_t sys_chunk_array_size;
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uint64_t chunk_root_generation;
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uint64_t compat_flags;
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uint64_t compat_ro_flags;
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uint64_t incompat_flags;
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uint16_t csum_type;
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uint8_t root_level;
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uint8_t chunk_root_level;
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uint8_t log_root_level;
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struct btrfs_dev_item dev_item;
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uint8_t label[BTRFS_LABEL_SIZE]; // LABEL
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// ...
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} PACKED;
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int volume_id_probe_btrfs(struct volume_id *id /*,uint64_t off*/)
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{
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#define off ((uint64_t) (64 * 1024))
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struct btrfs_super_block *sb;
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dbg("btrfs: probing at offset 0x%llx", (unsigned long long) off);
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sb = volume_id_get_buffer(id, off, sizeof(*sb));
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if (sb == NULL)
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return -1;
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if (memcmp(sb->magic, BTRFS_MAGIC, 8) != 0)
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return -1;
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// N.B.: btrfs supports 256-byte labels
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volume_id_set_label_string(id, sb->label, VOLUME_ID_LABEL_SIZE);
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volume_id_set_uuid(id, sb->fsid, UUID_DCE);
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return 0;
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}
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@ -44,7 +44,7 @@ get_label_uuid(int fd, char **label, char **uuid)
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if (vid->label[0] != '\0' || vid->uuid[0] != '\0') {
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*label = xstrndup(vid->label, sizeof(vid->label));
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*uuid = xstrndup(vid->uuid, sizeof(vid->uuid));
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dbg("found label '%s', uuid '%s' on %s", *label, *uuid, device);
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dbg("found label '%s', uuid '%s'", *label, *uuid);
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rv = 0;
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}
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ret:
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@ -109,6 +109,9 @@ static const probe_fptr fs2[] = {
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#if ENABLE_FEATURE_VOLUMEID_EXT
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volume_id_probe_ext,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_BTRFS
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volume_id_probe_btrfs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_REISERFS
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volume_id_probe_reiserfs,
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#endif
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@ -184,6 +184,8 @@ int volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t
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/* FS */
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int volume_id_probe_btrfs(struct volume_id *id /*,uint64_t off*/);
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int volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/);
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int volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/);
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