mirror of
https://github.com/sheumann/hush.git
synced 2024-12-25 03:32:18 +00:00
e418b2e7bb
Config description for nilfs added. No code change. Signed-off-by: Sven-Göran Bergh <sgb@systemasis.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
117 lines
4.1 KiB
C
117 lines
4.1 KiB
C
/*
|
|
* volume_id - reads filesystem label and uuid
|
|
*
|
|
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
|
|
* Copyright (C) 2012 S-G Bergh <sgb@systemasis.org>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_NILFS) += nilfs.o
|
|
|
|
//config:
|
|
//config:config FEATURE_VOLUMEID_NILFS
|
|
//config: bool "nilfs filesystem"
|
|
//config: default y
|
|
//config: depends on VOLUMEID
|
|
//config: help
|
|
//config: NILFS is a New Implementation of a Log-Structured File System (LFS)
|
|
//config: that supports continuous snapshots. This provides features like
|
|
//config: versioning of the entire filesystem, restoration of files that
|
|
//config: were deleted a few minutes ago. NILFS keeps consistency like
|
|
//config: conventional LFS, so it provides quick recovery after system crashes.
|
|
//config:
|
|
//config: The possible use of NILFS includes versioning, tamper detection,
|
|
//config: SOX compliance logging, and so forth. It can serve as an alternative
|
|
//config: filesystem for Linux desktop environment, or as a basis of advanced
|
|
//config: storage appliances.
|
|
//config:
|
|
|
|
#include "volume_id_internal.h"
|
|
|
|
#define NILFS_UUID_SIZE 16
|
|
#define NILFS_LABEL_SIZE 80
|
|
#define NILFS_SB1_OFFSET 0x400
|
|
#define NILFS_SB2_OFFSET 0x1000
|
|
#define NILFS_MAGIC 0x3434
|
|
|
|
struct nilfs2_super_block {
|
|
/* 0x00 */ uint32_t s_rev_level; // Major revision level.
|
|
/* 0x04 */ uint16_t s_minor_rev_level; // Minor revision level.
|
|
/* 0x06 */ uint16_t s_magic; // Magic signature.
|
|
/* 0x08 */ uint16_t s_bytes;
|
|
/* 0x0A */ uint16_t s_flags;
|
|
/* 0x0C */ uint32_t s_crc_seed;
|
|
/* 0x10 */ uint32_t s_sum;
|
|
/* 0x14 */ uint32_t s_log_block_size;
|
|
/* 0x18 */ uint64_t s_nsegments;
|
|
/* 0x20 */ uint64_t s_dev_size; // Block device size in bytes.
|
|
/* 0x28 */ uint64_t s_first_data_block;
|
|
/* 0x30 */ uint32_t s_blocks_per_segment;
|
|
/* 0x34 */ uint32_t s_r_segments_percentage;
|
|
/* 0x38 */ uint64_t s_last_cno;
|
|
/* 0x40 */ uint64_t s_last_pseg;
|
|
/* 0x48 */ uint64_t s_last_seq;
|
|
/* 0x50 */ uint64_t s_free_blocks_count;
|
|
/* 0x58 */ uint64_t s_ctime;
|
|
/* 0x60 */ uint64_t s_mtime;
|
|
/* 0x68 */ uint64_t s_wtime;
|
|
/* 0x70 */ uint16_t s_mnt_count;
|
|
/* 0x72 */ uint16_t s_max_mnt_count;
|
|
/* 0x74 */ uint16_t s_state;
|
|
/* 0x76 */ uint16_t s_errors;
|
|
/* 0x78 */ uint64_t s_lastcheck;
|
|
/* 0x80 */ uint32_t s_checkinterval;
|
|
/* 0x84 */ uint32_t s_creator_os;
|
|
/* 0x88 */ uint16_t s_def_resuid;
|
|
/* 0x8A */ uint16_t s_def_resgid;
|
|
/* 0x8C */ uint32_t s_first_ino;
|
|
/* 0x90 */ uint16_t s_inode_size;
|
|
/* 0x92 */ uint16_t s_dat_entry_size;
|
|
/* 0x94 */ uint16_t s_checkpoint_size;
|
|
/* 0x96 */ uint16_t s_segment_usage_size;
|
|
/* 0x98 */ uint8_t s_uuid[NILFS_UUID_SIZE]; // 128-bit UUID for volume.
|
|
/* 0xA8 */ uint8_t s_volume_name[NILFS_LABEL_SIZE]; // Volume label.
|
|
/* 0xF8 */ // ...
|
|
} PACKED;
|
|
|
|
int FAST_FUNC volume_id_probe_nilfs(struct volume_id *id /*,uint64_t off*/)
|
|
{
|
|
struct nilfs2_super_block *sb;
|
|
|
|
// Primary super block
|
|
dbg("nilfs: probing at offset 0x%x", NILFS_SB1_OFFSET);
|
|
|
|
sb = volume_id_get_buffer(id, NILFS_SB1_OFFSET, sizeof(*sb));
|
|
|
|
if (sb == NULL)
|
|
return -1;
|
|
|
|
if (sb->s_magic != NILFS_MAGIC)
|
|
return -1;
|
|
|
|
// The secondary superblock is not always used, so ignore it for now.
|
|
// When used it is at 4K from the end of the partition (sb->s_dev_size - NILFS_SB2_OFFSET).
|
|
|
|
volume_id_set_label_string(id, sb->s_volume_name, NILFS_LABEL_SIZE < VOLUME_ID_LABEL_SIZE ?
|
|
NILFS_LABEL_SIZE : VOLUME_ID_LABEL_SIZE);
|
|
volume_id_set_uuid(id, sb->s_uuid, UUID_DCE);
|
|
|
|
if (sb->s_rev_level == 2)
|
|
IF_FEATURE_BLKID_TYPE(id->type = "nilfs2");
|
|
|
|
return 0;
|
|
}
|