1 | /*
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2 | * volume_id - reads filesystem label and uuid
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3 | *
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4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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5 | * Copyright (C) 2012 S-G Bergh <sgb@systemasis.org>
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6 | *
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7 | * This library is free software; you can redistribute it and/or
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8 | * modify it under the terms of the GNU Lesser General Public
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9 | * License as published by the Free Software Foundation; either
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10 | * version 2.1 of the License, or (at your option) any later version.
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11 | *
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12 | * This library is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 | * Lesser General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU Lesser General Public
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18 | * License along with this library; if not, write to the Free Software
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19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 | */
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21 |
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22 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_NILFS) += nilfs.o
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23 |
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24 | //config:
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25 | //config:config FEATURE_VOLUMEID_NILFS
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26 | //config: bool "nilfs filesystem"
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27 | //config: default y
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28 | //config: depends on VOLUMEID
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29 | //config: help
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30 | //config: NILFS is a New Implementation of a Log-Structured File System (LFS)
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31 | //config: that supports continuous snapshots. This provides features like
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32 | //config: versioning of the entire filesystem, restoration of files that
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33 | //config: were deleted a few minutes ago. NILFS keeps consistency like
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34 | //config: conventional LFS, so it provides quick recovery after system crashes.
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35 | //config:
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36 | //config: The possible use of NILFS includes versioning, tamper detection,
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37 | //config: SOX compliance logging, and so forth. It can serve as an alternative
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38 | //config: filesystem for Linux desktop environment, or as a basis of advanced
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39 | //config: storage appliances.
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40 | //config:
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41 |
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42 | #include "volume_id_internal.h"
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43 |
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44 | #define NILFS_UUID_SIZE 16
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45 | #define NILFS_LABEL_SIZE 80
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46 | #define NILFS_SB1_OFFSET 0x400
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47 | #define NILFS_SB2_OFFSET 0x1000
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48 | #define NILFS_MAGIC 0x3434
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49 |
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50 | struct nilfs2_super_block {
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51 | /* 0x00 */ uint32_t s_rev_level; // Major revision level.
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52 | /* 0x04 */ uint16_t s_minor_rev_level; // Minor revision level.
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53 | /* 0x06 */ uint16_t s_magic; // Magic signature.
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54 | /* 0x08 */ uint16_t s_bytes;
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55 | /* 0x0A */ uint16_t s_flags;
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56 | /* 0x0C */ uint32_t s_crc_seed;
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57 | /* 0x10 */ uint32_t s_sum;
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58 | /* 0x14 */ uint32_t s_log_block_size;
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59 | /* 0x18 */ uint64_t s_nsegments;
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60 | /* 0x20 */ uint64_t s_dev_size; // Block device size in bytes.
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61 | /* 0x28 */ uint64_t s_first_data_block;
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62 | /* 0x30 */ uint32_t s_blocks_per_segment;
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63 | /* 0x34 */ uint32_t s_r_segments_percentage;
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64 | /* 0x38 */ uint64_t s_last_cno;
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65 | /* 0x40 */ uint64_t s_last_pseg;
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66 | /* 0x48 */ uint64_t s_last_seq;
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67 | /* 0x50 */ uint64_t s_free_blocks_count;
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68 | /* 0x58 */ uint64_t s_ctime;
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69 | /* 0x60 */ uint64_t s_mtime;
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70 | /* 0x68 */ uint64_t s_wtime;
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71 | /* 0x70 */ uint16_t s_mnt_count;
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72 | /* 0x72 */ uint16_t s_max_mnt_count;
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73 | /* 0x74 */ uint16_t s_state;
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74 | /* 0x76 */ uint16_t s_errors;
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75 | /* 0x78 */ uint64_t s_lastcheck;
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76 | /* 0x80 */ uint32_t s_checkinterval;
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77 | /* 0x84 */ uint32_t s_creator_os;
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78 | /* 0x88 */ uint16_t s_def_resuid;
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79 | /* 0x8A */ uint16_t s_def_resgid;
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80 | /* 0x8C */ uint32_t s_first_ino;
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81 | /* 0x90 */ uint16_t s_inode_size;
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82 | /* 0x92 */ uint16_t s_dat_entry_size;
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83 | /* 0x94 */ uint16_t s_checkpoint_size;
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84 | /* 0x96 */ uint16_t s_segment_usage_size;
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85 | /* 0x98 */ uint8_t s_uuid[NILFS_UUID_SIZE]; // 128-bit UUID for volume.
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86 | /* 0xA8 */ uint8_t s_volume_name[NILFS_LABEL_SIZE]; // Volume label.
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87 | /* 0xF8 */ // ...
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88 | } PACKED;
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89 |
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90 | int FAST_FUNC volume_id_probe_nilfs(struct volume_id *id /*,uint64_t off*/)
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91 | {
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92 | struct nilfs2_super_block *sb;
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93 |
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94 | // Primary super block
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95 | dbg("nilfs: probing at offset 0x%x", NILFS_SB1_OFFSET);
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96 |
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97 | sb = volume_id_get_buffer(id, NILFS_SB1_OFFSET, sizeof(*sb));
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98 |
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99 | if (sb == NULL)
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100 | return -1;
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101 |
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102 | if (sb->s_magic != NILFS_MAGIC)
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103 | return -1;
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104 |
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105 | // The secondary superblock is not always used, so ignore it for now.
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106 | // When used it is at 4K from the end of the partition (sb->s_dev_size - NILFS_SB2_OFFSET).
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107 |
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108 | volume_id_set_label_string(id, sb->s_volume_name, NILFS_LABEL_SIZE < VOLUME_ID_LABEL_SIZE ?
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109 | NILFS_LABEL_SIZE : VOLUME_ID_LABEL_SIZE);
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110 | volume_id_set_uuid(id, sb->s_uuid, UUID_DCE);
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111 |
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112 | if (sb->s_rev_level == 2)
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113 | IF_FEATURE_BLKID_TYPE(id->type = "nilfs2");
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114 |
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115 | return 0;
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116 | }
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