| /* vi: set sw=4 ts=4: */ |
| /* |
| * mkfs_reiser: utility to create ReiserFS filesystem |
| * |
| * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| |
| //usage:#define mkfs_reiser_trivial_usage |
| //usage: "[-f] [-l LABEL] BLOCKDEV [4K-BLOCKS]" |
| //usage:#define mkfs_reiser_full_usage "\n\n" |
| //usage: "Make a ReiserFS V3 filesystem\n" |
| //usage: "\n -f Force" |
| //usage: "\n -l LBL Volume label" |
| |
| #include "libbb.h" |
| #include <linux/fs.h> |
| |
| char BUG_wrong_field_size(void); |
| #define STORE_LE(field, value) \ |
| do { \ |
| if (sizeof(field) == 4) \ |
| field = SWAP_LE32(value); \ |
| else if (sizeof(field) == 2) \ |
| field = SWAP_LE16(value); \ |
| else if (sizeof(field) == 1) \ |
| field = (value); \ |
| else \ |
| BUG_wrong_field_size(); \ |
| } while (0) |
| |
| #define FETCH_LE32(field) \ |
| (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size()) |
| |
| struct journal_params { |
| uint32_t jp_journal_1st_block; /* where does journal start from on its device */ |
| uint32_t jp_journal_dev; /* journal device st_rdev */ |
| uint32_t jp_journal_size; /* size of the journal on FS creation. used to make sure they don't overflow it */ |
| uint32_t jp_journal_trans_max; /* max number of blocks in a transaction. */ |
| uint32_t jp_journal_magic; /* random value made on fs creation (this was sb_journal_block_count) */ |
| uint32_t jp_journal_max_batch; /* max number of blocks to batch into a trans */ |
| uint32_t jp_journal_max_commit_age; /* in seconds, how old can an async commit be */ |
| uint32_t jp_journal_max_trans_age; /* in seconds, how old can a transaction be */ |
| }; |
| |
| struct reiserfs_journal_header { |
| uint32_t jh_last_flush_trans_id; /* id of last fully flushed transaction */ |
| uint32_t jh_first_unflushed_offset; /* offset in the log of where to start replay after a crash */ |
| uint32_t jh_mount_id; |
| struct journal_params jh_journal; |
| uint32_t jh_last_check_mount_id; /* the mount id of the fs during the last reiserfsck --check. */ |
| }; |
| |
| struct reiserfs_super_block { |
| uint32_t sb_block_count; /* 0 number of block on data device */ |
| uint32_t sb_free_blocks; /* 4 free blocks count */ |
| uint32_t sb_root_block; /* 8 root of the tree */ |
| |
| struct journal_params sb_journal; /* 12 */ |
| |
| uint16_t sb_blocksize; /* 44 */ |
| uint16_t sb_oid_maxsize; /* 46 max size of object id array, see get_objectid() commentary */ |
| uint16_t sb_oid_cursize; /* 48 current size of object id array */ |
| uint16_t sb_umount_state; /* 50 this is set to 1 when filesystem was umounted, to 2 - when not */ |
| |
| char s_magic[10]; /* 52 "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */ |
| uint16_t sb_fs_state; /* 62 it is set to used by fsck to mark which phase of rebuilding is done (used for fsck debugging) */ |
| uint32_t sb_hash_function_code; /* 64 code of function which was/is/will be used to sort names in a directory. See codes in above */ |
| uint16_t sb_tree_height; /* 68 height of filesytem tree. Tree consisting of only one root block has 2 here */ |
| uint16_t sb_bmap_nr; /* 70 amount of bitmap blocks needed to address each block of file system */ |
| uint16_t sb_version; /* 72 this field is only reliable on filesystem with non-standard journal */ |
| uint16_t sb_reserved_for_journal; /* 74 size in blocks of journal area on main device, we need to keep after non-standard journal relocation */ |
| uint32_t sb_inode_generation; /* 76 */ |
| uint32_t sb_flags; /* 80 Right now used only by inode-attributes, if enabled */ |
| unsigned char s_uuid[16]; /* 84 filesystem unique identifier */ |
| unsigned char s_label[16]; /* 100 filesystem volume label */ |
| uint16_t sb_mnt_count; /* 116 */ |
| uint16_t sb_max_mnt_count; /* 118 */ |
| uint32_t sb_lastcheck; /* 120 */ |
| uint32_t sb_check_interval; /* 124 */ |
| /* zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() so any additions must be updated there as well. */ |
| char s_unused[76]; /* 128 */ |
| /* 204 */ |
| }; |
| |
| /* Header of a disk block. More precisely, header of a formatted leaf |
| or internal node, and not the header of an unformatted node. */ |
| struct block_head { |
| uint16_t blk2_level; /* Level of a block in the tree. */ |
| uint16_t blk2_nr_item; /* Number of keys/items in a block. */ |
| uint16_t blk2_free_space; /* Block free space in bytes. */ |
| uint16_t blk_reserved; |
| uint32_t reserved[4]; |
| }; |
| |
| #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024) |
| |
| #define REISERFS_3_6_SUPER_MAGIC_STRING "ReIsEr2Fs" |
| #define REISERFS_FORMAT_3_6 2 |
| #define DEFAULT_MAX_MNT_COUNT 30 /* 30 mounts */ |
| #define DEFAULT_CHECK_INTERVAL (180 * 60 * 60 * 24) /* 180 days */ |
| |
| #define FS_CLEANLY_UMOUNTED 1 /* this was REISERFS_VALID_FS */ |
| |
| #define JOURNAL_MIN_SIZE 512 |
| /* biggest possible single transaction, don't change for now (8/3/99) */ |
| #define JOURNAL_TRANS_MAX 1024 |
| #define JOURNAL_TRANS_MIN 256 /* need to check whether it works */ |
| #define JOURNAL_DEFAULT_RATIO 8 /* default journal size / max trans length */ |
| #define JOURNAL_MIN_RATIO 2 |
| /* max blocks to batch into one transaction, don't make this any bigger than 900 */ |
| #define JOURNAL_MAX_BATCH 900 |
| #define JOURNAL_MAX_COMMIT_AGE 30 |
| |
| |
| // Standard mkreiserfs 3.6.21: |
| // -b | --block-size N size of file-system block, in bytes |
| // -j | --journal-device FILE path to separate device to hold journal |
| // -s | --journal-size N size of the journal in blocks |
| // -o | --journal-offset N offset of the journal from the start of |
| // the separate device, in blocks |
| // -t | --transaction-max-size N maximal size of transaction, in blocks |
| // -B | --badblocks file store all bad blocks given in file on the fs |
| // -h | --hash rupasov|tea|r5 hash function to use by default |
| // -u | --uuid UUID store UUID in the superblock |
| // -l | --label LABEL store LABEL in the superblock |
| // --format 3.5|3.6 old 3.5 format or newer 3.6 |
| // -f | --force specified once, make mkreiserfs the whole |
| // disk, not block device or mounted partition; |
| // specified twice, do not ask for confirmation |
| // -q | --quiet quiet work without messages, progress and |
| // questions. Useful if run in a script. For use |
| // by end users only. |
| // -d | --debug print debugging information during mkreiser |
| // -V print version and exit |
| |
| // Options not commented below are taken but silently ignored: |
| enum { |
| OPT_b = 1 << 0, |
| OPT_j = 1 << 1, |
| OPT_s = 1 << 2, |
| OPT_o = 1 << 3, |
| OPT_t = 1 << 4, |
| OPT_B = 1 << 5, |
| OPT_h = 1 << 6, |
| OPT_u = 1 << 7, |
| OPT_l = 1 << 8, // label |
| OPT_f = 1 << 9, // ask no questions |
| OPT_q = 1 << 10, |
| OPT_d = 1 << 11, |
| //OPT_V = 1 << 12, // -V version. bbox applets don't support that |
| }; |
| |
| int mkfs_reiser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int mkfs_reiser_main(int argc UNUSED_PARAM, char **argv) |
| { |
| unsigned blocksize = 4096; |
| unsigned journal_blocks = 8192; |
| unsigned blocks, bitmap_blocks, i, block; |
| time_t timestamp; |
| const char *label = ""; |
| struct stat st; |
| int fd; |
| uint8_t *buf; |
| struct reiserfs_super_block *sb; |
| struct journal_params *jp; |
| struct block_head *root; |
| |
| // using global "option_mask32" instead of local "opts": |
| // we are register starved here |
| opt_complementary = "-1"; |
| /*opts =*/ getopt32(argv, "b:+j:s:o:t:B:h:u:l:fqd", |
| NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &label); |
| argv += optind; // argv[0] -- device |
| |
| // check the device is a block device |
| fd = xopen(argv[0], O_WRONLY | O_EXCL); |
| xfstat(fd, &st, argv[0]); |
| if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_f)) |
| bb_error_msg_and_die("%s: not a block device", argv[0]); |
| |
| // check if it is mounted |
| // N.B. what if we format a file? find_mount_point will return false negative since |
| // it is loop block device which is mounted! |
| if (find_mount_point(argv[0], 0)) |
| bb_error_msg_and_die("can't format mounted filesystem"); |
| |
| // open the device, get size in blocks |
| blocks = get_volume_size_in_bytes(fd, argv[1], blocksize, /*extend:*/ 1) / blocksize; |
| |
| // block number sanity check |
| // we have a limit: skipped area, super block, journal and root block |
| // all have to be addressed by one first bitmap |
| block = REISERFS_DISK_OFFSET_IN_BYTES / blocksize // boot area |
| + 1 // sb |
| + 1 // bitmap#0 |
| + journal_blocks+1 // journal |
| ; |
| |
| // count overhead |
| bitmap_blocks = (blocks - 1) / (blocksize * 8) + 1; |
| i = block + bitmap_blocks; |
| |
| // check overhead |
| if (MIN(blocksize * 8, blocks) < i) |
| bb_error_msg_and_die("need >= %u blocks", i); |
| |
| // ask confirmation? |
| // TODO: ??? |
| |
| // wipe out first REISERFS_DISK_OFFSET_IN_BYTES of device |
| // TODO: do we really need to wipe?! |
| xlseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET); |
| |
| // fill superblock |
| sb = (struct reiserfs_super_block *)xzalloc(blocksize); |
| // block count |
| STORE_LE(sb->sb_block_count, blocks); |
| STORE_LE(sb->sb_free_blocks, blocks - i); |
| // TODO: decypher! |
| STORE_LE(sb->sb_root_block, block); |
| // fill journal related fields |
| jp = &sb->sb_journal; |
| STORE_LE(jp->jp_journal_1st_block, REISERFS_DISK_OFFSET_IN_BYTES / blocksize + 1/*sb*/ + 1/*bmp#0*/); |
| timestamp = time(NULL); |
| srand(timestamp); |
| STORE_LE(jp->jp_journal_magic, rand()); |
| STORE_LE(jp->jp_journal_size, journal_blocks); |
| STORE_LE(jp->jp_journal_trans_max, JOURNAL_TRANS_MAX); |
| STORE_LE(jp->jp_journal_max_batch, JOURNAL_MAX_BATCH); |
| STORE_LE(jp->jp_journal_max_commit_age, JOURNAL_MAX_COMMIT_AGE); |
| // sizes |
| STORE_LE(sb->sb_blocksize, blocksize); |
| STORE_LE(sb->sb_oid_maxsize, (blocksize - sizeof(*sb)) / sizeof(uint32_t) / 2 * 2); |
| STORE_LE(sb->sb_oid_cursize, 2); // "." and ".." |
| strcpy(sb->s_magic, REISERFS_3_6_SUPER_MAGIC_STRING); |
| STORE_LE(sb->sb_bmap_nr, (bitmap_blocks > ((1LL << 16) - 1)) ? 0 : bitmap_blocks); |
| // misc |
| STORE_LE(sb->sb_version, REISERFS_FORMAT_3_6); |
| STORE_LE(sb->sb_lastcheck, timestamp); |
| STORE_LE(sb->sb_check_interval, DEFAULT_CHECK_INTERVAL); |
| STORE_LE(sb->sb_mnt_count, 1); |
| STORE_LE(sb->sb_max_mnt_count, DEFAULT_MAX_MNT_COUNT); |
| STORE_LE(sb->sb_umount_state, FS_CLEANLY_UMOUNTED); |
| STORE_LE(sb->sb_tree_height, 2); |
| STORE_LE(sb->sb_hash_function_code, 3); // R5_HASH |
| STORE_LE(sb->sb_flags, 1); |
| //STORE_LE(sb->sb_reserved_for_journal, 0); |
| // create UUID |
| generate_uuid(sb->s_uuid); |
| // write the label |
| safe_strncpy((char *)sb->s_label, label, sizeof(sb->s_label)); |
| |
| // TODO: EMPIRIC! ENDIANNESS! |
| // superblock has only 204 bytes. What are these? |
| buf = (uint8_t *)sb; |
| buf[205] = 1; |
| buf[209] = 3; |
| |
| // put superblock |
| xwrite(fd, sb, blocksize); |
| |
| // create bitmaps |
| buf = xzalloc(blocksize); |
| |
| // bitmap #0 uses initial "block"+1 blocks |
| i = block + 1; |
| memset(buf, 0xFF, i / 8); |
| buf[i / 8] = (1 << (i & 7)) - 1; //0..7 => 00000000..01111111 |
| // mark trailing absent blocks, if any |
| if (blocks < 8*blocksize) { |
| unsigned n = 8*blocksize - blocks; |
| i = n / 8; |
| buf[blocksize - i - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110 |
| memset(buf + blocksize - i, 0xFF, i); // N.B. no overflow here! |
| } |
| // put bitmap #0 |
| xwrite(fd, buf, blocksize); |
| |
| // now go journal blocks |
| memset(buf, 0, blocksize); |
| for (i = 0; i < journal_blocks; i++) |
| xwrite(fd, buf, blocksize); |
| // dump journal control block |
| memcpy(&((struct reiserfs_journal_header *)buf)->jh_journal, &sb->sb_journal, sizeof(sb->sb_journal)); |
| xwrite(fd, buf, blocksize); |
| |
| // other bitmaps are in every (8*blocksize)-th block |
| // N.B. they use the only block -- namely bitmap itself! |
| buf[0] = 0x01; |
| // put bitmaps |
| for (i = 1; i < bitmap_blocks; i++) { |
| xlseek(fd, i*8*blocksize * blocksize, SEEK_SET); |
| // mark trailing absent blocks, if any |
| if (i == bitmap_blocks - 1 && (blocks % (8*blocksize))) { |
| unsigned n = 8*blocksize - blocks % (8*blocksize); |
| unsigned j = n / 8; |
| buf[blocksize - j - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110 |
| memset(buf + blocksize - j, 0xFF, j); // N.B. no overflow here! |
| } |
| xwrite(fd, buf, blocksize); |
| } |
| |
| // fill root block |
| // block head |
| memset(buf, 0, blocksize); |
| root = (struct block_head *)buf; |
| STORE_LE(root->blk2_level, 1); // leaf node |
| STORE_LE(root->blk2_nr_item, 2); // "." and ".." |
| STORE_LE(root->blk2_free_space, blocksize - sizeof(struct block_head)); |
| // item head |
| // root directory |
| // TODO: EMPIRIC! ENDIANNESS! |
| // TODO: indented assignments seem to be timestamps |
| buf[4] = 0134; |
| buf[24] = 01; |
| buf[28] = 02; |
| buf[42] = 054; |
| buf[44] = 0324; |
| buf[45] = 017; |
| buf[46] = 01; |
| buf[48] = 01; |
| buf[52] = 02; |
| buf[56] = 01; |
| buf[60] = 0364; |
| buf[61] = 01; |
| buf[64] = 02; |
| buf[66] = 060; |
| buf[68] = 0244; |
| buf[69] = 017; |
| buf[4004] = 01; |
| buf[4008] = 01; |
| buf[4012] = 02; |
| buf[4016] = 050; |
| buf[4018] = 04; |
| buf[4020] = 02; |
| buf[4028] = 01; |
| buf[4032] = 040; |
| buf[4034] = 04; |
| |
| buf[4036] = 056; buf[4037] = 056; // ".." |
| buf[4044] = 056; // "." |
| |
| buf[4052] = 0355; |
| buf[4053] = 0101; |
| buf[4056] = 03; |
| buf[4060] = 060; |
| buf[4076] = 0173; |
| buf[4077] = 0240; |
| buf[4078] = 0344; |
| buf[4079] = 0112; |
| buf[4080] = 0173; |
| buf[4081] = 0240; |
| buf[4082] = 0344; |
| buf[4083] = 0112; |
| buf[4084] = 0173; |
| buf[4085] = 0240; |
| buf[4086] = 0344; |
| buf[4087] = 0112; |
| buf[4088] = 01; |
| |
| // put root block |
| xlseek(fd, block * blocksize, SEEK_SET); |
| xwrite(fd, buf, blocksize); |
| |
| // cleanup |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| free(buf); |
| free(sb); |
| } |
| |
| xclose(fd); |
| return EXIT_SUCCESS; |
| } |