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Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +01001/* vi: set sw=4 ts=4: */
2/*
3 * mkfs_reiser: utility to create ReiserFS filesystem
4 *
5 * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
6 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02007 * Licensed under GPLv2, see file LICENSE in this source tree.
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +01008 */
Pere Orga5bc8c002011-04-11 03:29:49 +02009
10//usage:#define mkfs_reiser_trivial_usage
11//usage: "[-f] [-l LABEL] BLOCKDEV [4K-BLOCKS]"
12//usage:#define mkfs_reiser_full_usage "\n\n"
13//usage: "Make a ReiserFS V3 filesystem\n"
Pere Orga5bc8c002011-04-11 03:29:49 +020014//usage: "\n -f Force"
15//usage: "\n -l LBL Volume label"
16
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +010017#include "libbb.h"
18#include <linux/fs.h>
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +010019
20char BUG_wrong_field_size(void);
21#define STORE_LE(field, value) \
22do { \
23 if (sizeof(field) == 4) \
Denys Vlasenko67743862010-05-09 00:13:40 +020024 field = SWAP_LE32(value); \
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +010025 else if (sizeof(field) == 2) \
Denys Vlasenko67743862010-05-09 00:13:40 +020026 field = SWAP_LE16(value); \
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +010027 else if (sizeof(field) == 1) \
28 field = (value); \
29 else \
30 BUG_wrong_field_size(); \
31} while (0)
32
33#define FETCH_LE32(field) \
Denys Vlasenko67743862010-05-09 00:13:40 +020034 (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +010035
36struct journal_params {
37 uint32_t jp_journal_1st_block; /* where does journal start from on its device */
38 uint32_t jp_journal_dev; /* journal device st_rdev */
39 uint32_t jp_journal_size; /* size of the journal on FS creation. used to make sure they don't overflow it */
40 uint32_t jp_journal_trans_max; /* max number of blocks in a transaction. */
41 uint32_t jp_journal_magic; /* random value made on fs creation (this was sb_journal_block_count) */
42 uint32_t jp_journal_max_batch; /* max number of blocks to batch into a trans */
43 uint32_t jp_journal_max_commit_age; /* in seconds, how old can an async commit be */
44 uint32_t jp_journal_max_trans_age; /* in seconds, how old can a transaction be */
45};
46
47struct reiserfs_journal_header {
48 uint32_t jh_last_flush_trans_id; /* id of last fully flushed transaction */
49 uint32_t jh_first_unflushed_offset; /* offset in the log of where to start replay after a crash */
50 uint32_t jh_mount_id;
51 struct journal_params jh_journal;
52 uint32_t jh_last_check_mount_id; /* the mount id of the fs during the last reiserfsck --check. */
53};
54
55struct reiserfs_super_block {
56 uint32_t sb_block_count; /* 0 number of block on data device */
57 uint32_t sb_free_blocks; /* 4 free blocks count */
58 uint32_t sb_root_block; /* 8 root of the tree */
59
60 struct journal_params sb_journal; /* 12 */
61
62 uint16_t sb_blocksize; /* 44 */
63 uint16_t sb_oid_maxsize; /* 46 max size of object id array, see get_objectid() commentary */
64 uint16_t sb_oid_cursize; /* 48 current size of object id array */
65 uint16_t sb_umount_state; /* 50 this is set to 1 when filesystem was umounted, to 2 - when not */
66
67 char s_magic[10]; /* 52 "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
68 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) */
69 uint32_t sb_hash_function_code; /* 64 code of fuction which was/is/will be used to sort names in a directory. See codes in above */
70 uint16_t sb_tree_height; /* 68 height of filesytem tree. Tree consisting of only one root block has 2 here */
71 uint16_t sb_bmap_nr; /* 70 amount of bitmap blocks needed to address each block of file system */
72 uint16_t sb_version; /* 72 this field is only reliable on filesystem with non-standard journal */
73 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 */
74 uint32_t sb_inode_generation; /* 76 */
75 uint32_t sb_flags; /* 80 Right now used only by inode-attributes, if enabled */
76 unsigned char s_uuid[16]; /* 84 filesystem unique identifier */
77 unsigned char s_label[16]; /* 100 filesystem volume label */
78 uint16_t sb_mnt_count; /* 116 */
79 uint16_t sb_max_mnt_count; /* 118 */
80 uint32_t sb_lastcheck; /* 120 */
81 uint32_t sb_check_interval; /* 124 */
82/* zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() so any additions must be updated there as well. */
83 char s_unused[76]; /* 128 */
84 /* 204 */
85};
86
87/* Header of a disk block. More precisely, header of a formatted leaf
88 or internal node, and not the header of an unformatted node. */
89struct block_head {
90 uint16_t blk2_level; /* Level of a block in the tree. */
91 uint16_t blk2_nr_item; /* Number of keys/items in a block. */
92 uint16_t blk2_free_space; /* Block free space in bytes. */
93 uint16_t blk_reserved;
94 uint32_t reserved[4];
95};
96
97#define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
98
99#define REISERFS_3_6_SUPER_MAGIC_STRING "ReIsEr2Fs"
100#define REISERFS_FORMAT_3_6 2
101#define DEFAULT_MAX_MNT_COUNT 30 /* 30 mounts */
102#define DEFAULT_CHECK_INTERVAL (180 * 60 * 60 * 24) /* 180 days */
103
104#define FS_CLEANLY_UMOUNTED 1 /* this was REISERFS_VALID_FS */
105
106#define JOURNAL_MIN_SIZE 512
107/* biggest possible single transaction, don't change for now (8/3/99) */
108#define JOURNAL_TRANS_MAX 1024
109#define JOURNAL_TRANS_MIN 256 /* need to check whether it works */
110#define JOURNAL_DEFAULT_RATIO 8 /* default journal size / max trans length */
111#define JOURNAL_MIN_RATIO 2
112/* max blocks to batch into one transaction, don't make this any bigger than 900 */
113#define JOURNAL_MAX_BATCH 900
114#define JOURNAL_MAX_COMMIT_AGE 30
115
116
117// Standard mkreiserfs 3.6.21:
118// -b | --block-size N size of file-system block, in bytes
119// -j | --journal-device FILE path to separate device to hold journal
120// -s | --journal-size N size of the journal in blocks
121// -o | --journal-offset N offset of the journal from the start of
122// the separate device, in blocks
123// -t | --transaction-max-size N maximal size of transaction, in blocks
124// -B | --badblocks file store all bad blocks given in file on the fs
125// -h | --hash rupasov|tea|r5 hash function to use by default
126// -u | --uuid UUID store UUID in the superblock
127// -l | --label LABEL store LABEL in the superblock
128// --format 3.5|3.6 old 3.5 format or newer 3.6
129// -f | --force specified once, make mkreiserfs the whole
130// disk, not block device or mounted partition;
131// specified twice, do not ask for confirmation
132// -q | --quiet quiet work without messages, progress and
133// questions. Useful if run in a script. For use
134// by end users only.
135// -d | --debug print debugging information during mkreiser
136// -V print version and exit
137
138// Options not commented below are taken but silently ignored:
139enum {
140 OPT_b = 1 << 0,
141 OPT_j = 1 << 1,
142 OPT_s = 1 << 2,
143 OPT_o = 1 << 3,
144 OPT_t = 1 << 4,
145 OPT_B = 1 << 5,
146 OPT_h = 1 << 6,
147 OPT_u = 1 << 7,
148 OPT_l = 1 << 8, // label
149 OPT_f = 1 << 9, // ask no questions
150 OPT_q = 1 << 10,
151 OPT_d = 1 << 11,
152 //OPT_V = 1 << 12, // -V version. bbox applets don't support that
153};
154
155int mkfs_reiser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
156int mkfs_reiser_main(int argc UNUSED_PARAM, char **argv)
157{
158 unsigned blocksize = 4096;
159 unsigned journal_blocks = 8192;
160 unsigned blocks, bitmap_blocks, i, block;
161 time_t timestamp;
162 const char *label = "";
163 struct stat st;
164 int fd;
165 uint8_t *buf;
166 struct reiserfs_super_block *sb;
167 struct journal_params *jp;
168 struct block_head *root;
169
170 // using global "option_mask32" instead of local "opts":
171 // we are register starved here
172 opt_complementary = "-1:b+";
173 /*opts =*/ getopt32(argv, "b:j:s:o:t:B:h:u:l:fqd",
174 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &label);
175 argv += optind; // argv[0] -- device
176
177 // check the device is a block device
178 fd = xopen(argv[0], O_WRONLY | O_EXCL);
Denys Vlasenko8d3e2252010-08-31 12:42:06 +0200179 xfstat(fd, &st, argv[0]);
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +0100180 if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_f))
Denys Vlasenko8d3e2252010-08-31 12:42:06 +0200181 bb_error_msg_and_die("%s: not a block device", argv[0]);
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +0100182
183 // check if it is mounted
184 // N.B. what if we format a file? find_mount_point will return false negative since
Denys Vlasenko40e7d252010-02-01 23:48:27 +0100185 // it is loop block device which is mounted!
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +0100186 if (find_mount_point(argv[0], 0))
187 bb_error_msg_and_die("can't format mounted filesystem");
188
189 // open the device, get size in blocks
Denys Vlasenko40e7d252010-02-01 23:48:27 +0100190 blocks = get_volume_size_in_bytes(fd, argv[1], blocksize, /*extend:*/ 1) / blocksize;
Vladimir Dronnikov0d8ea642009-11-02 10:41:46 +0100191
192 // block number sanity check
193 // we have a limit: skipped area, super block, journal and root block
194 // all have to be addressed by one first bitmap
195 block = REISERFS_DISK_OFFSET_IN_BYTES / blocksize // boot area
196 + 1 // sb
197 + 1 // bitmap#0
198 + journal_blocks+1 // journal
199 ;
200
201 // count overhead
202 bitmap_blocks = (blocks - 1) / (blocksize * 8) + 1;
203 i = block + bitmap_blocks;
204
205 // check overhead
206 if (MIN(blocksize * 8, blocks) < i)
207 bb_error_msg_and_die("need >= %u blocks", i);
208
209 // ask confirmation?
210 // TODO: ???
211
212 // wipe out first REISERFS_DISK_OFFSET_IN_BYTES of device
213 // TODO: do we really need to wipe?!
214 xlseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET);
215
216 // fill superblock
217 sb = (struct reiserfs_super_block *)xzalloc(blocksize);
218 // block count
219 STORE_LE(sb->sb_block_count, blocks);
220 STORE_LE(sb->sb_free_blocks, blocks - i);
221 // TODO: decypher!
222 STORE_LE(sb->sb_root_block, block);
223 // fill journal related fields
224 jp = &sb->sb_journal;
225 STORE_LE(jp->jp_journal_1st_block, REISERFS_DISK_OFFSET_IN_BYTES / blocksize + 1/*sb*/ + 1/*bmp#0*/);
226 timestamp = time(NULL);
227 srandom(timestamp);
228 STORE_LE(jp->jp_journal_magic, random());
229 STORE_LE(jp->jp_journal_size, journal_blocks);
230 STORE_LE(jp->jp_journal_trans_max, JOURNAL_TRANS_MAX);
231 STORE_LE(jp->jp_journal_max_batch, JOURNAL_MAX_BATCH);
232 STORE_LE(jp->jp_journal_max_commit_age, JOURNAL_MAX_COMMIT_AGE);
233 // sizes
234 STORE_LE(sb->sb_blocksize, blocksize);
235 STORE_LE(sb->sb_oid_maxsize, (blocksize - sizeof(*sb)) / sizeof(uint32_t) / 2 * 2);
236 STORE_LE(sb->sb_oid_cursize, 2); // "." and ".."
237 strcpy(sb->s_magic, REISERFS_3_6_SUPER_MAGIC_STRING);
238 STORE_LE(sb->sb_bmap_nr, (bitmap_blocks > ((1LL << 16) - 1)) ? 0 : bitmap_blocks);
239 // misc
240 STORE_LE(sb->sb_version, REISERFS_FORMAT_3_6);
241 STORE_LE(sb->sb_lastcheck, timestamp);
242 STORE_LE(sb->sb_check_interval, DEFAULT_CHECK_INTERVAL);
243 STORE_LE(sb->sb_mnt_count, 1);
244 STORE_LE(sb->sb_max_mnt_count, DEFAULT_MAX_MNT_COUNT);
245 STORE_LE(sb->sb_umount_state, FS_CLEANLY_UMOUNTED);
246 STORE_LE(sb->sb_tree_height, 2);
247 STORE_LE(sb->sb_hash_function_code, 3); // R5_HASH
248 STORE_LE(sb->sb_flags, 1);
249 //STORE_LE(sb->sb_reserved_for_journal, 0);
250 // create UUID
251 generate_uuid(sb->s_uuid);
252 // write the label
253 safe_strncpy((char *)sb->s_label, label, sizeof(sb->s_label));
254
255 // TODO: EMPIRIC! ENDIANNESS!
256 // superblock has only 204 bytes. What are these?
257 buf = (uint8_t *)sb;
258 buf[205] = 1;
259 buf[209] = 3;
260
261 // put superblock
262 xwrite(fd, sb, blocksize);
263
264 // create bitmaps
265 buf = xzalloc(blocksize);
266
267 // bitmap #0 uses initial "block"+1 blocks
268 i = block + 1;
269 memset(buf, 0xFF, i / 8);
270 buf[i / 8] = (1 << (i & 7)) - 1; //0..7 => 00000000..01111111
271 // mark trailing absent blocks, if any
272 if (blocks < 8*blocksize) {
273 unsigned n = 8*blocksize - blocks;
274 i = n / 8;
275 buf[blocksize - i - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
276 memset(buf + blocksize - i, 0xFF, i); // N.B. no overflow here!
277 }
278 // put bitmap #0
279 xwrite(fd, buf, blocksize);
280
281 // now go journal blocks
282 memset(buf, 0, blocksize);
283 for (i = 0; i < journal_blocks; i++)
284 xwrite(fd, buf, blocksize);
285 // dump journal control block
286 memcpy(&((struct reiserfs_journal_header *)buf)->jh_journal, &sb->sb_journal, sizeof(sb->sb_journal));
287 xwrite(fd, buf, blocksize);
288
289 // other bitmaps are in every (8*blocksize)-th block
290 // N.B. they use the only block -- namely bitmap itself!
291 buf[0] = 0x01;
292 // put bitmaps
293 for (i = 1; i < bitmap_blocks; i++) {
294 xlseek(fd, i*8*blocksize * blocksize, SEEK_SET);
295 // mark trailing absent blocks, if any
296 if (i == bitmap_blocks - 1 && (blocks % (8*blocksize))) {
297 unsigned n = 8*blocksize - blocks % (8*blocksize);
298 unsigned j = n / 8;
299 buf[blocksize - j - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
300 memset(buf + blocksize - j, 0xFF, j); // N.B. no overflow here!
301 }
302 xwrite(fd, buf, blocksize);
303 }
304
305 // fill root block
306 // block head
307 memset(buf, 0, blocksize);
308 root = (struct block_head *)buf;
309 STORE_LE(root->blk2_level, 1); // leaf node
310 STORE_LE(root->blk2_nr_item, 2); // "." and ".."
311 STORE_LE(root->blk2_free_space, blocksize - sizeof(struct block_head));
312 // item head
313 // root directory
314 // TODO: EMPIRIC! ENDIANNESS!
315 // TODO: indented assignments seem to be timestamps
316buf[4] = 0134;
317buf[24] = 01;
318buf[28] = 02;
319buf[42] = 054;
320buf[44] = 0324;
321buf[45] = 017;
322buf[46] = 01;
323buf[48] = 01;
324buf[52] = 02;
325buf[56] = 01;
326buf[60] = 0364;
327buf[61] = 01;
328buf[64] = 02;
329buf[66] = 060;
330buf[68] = 0244;
331buf[69] = 017;
332buf[4004] = 01;
333buf[4008] = 01;
334buf[4012] = 02;
335buf[4016] = 050;
336buf[4018] = 04;
337buf[4020] = 02;
338buf[4028] = 01;
339buf[4032] = 040;
340buf[4034] = 04;
341
342buf[4036] = 056; buf[4037] = 056; // ".."
343buf[4044] = 056; // "."
344
345buf[4052] = 0355;
346buf[4053] = 0101;
347buf[4056] = 03;
348buf[4060] = 060;
349 buf[4076] = 0173;
350 buf[4077] = 0240;
351 buf[4078] = 0344;
352 buf[4079] = 0112;
353 buf[4080] = 0173;
354 buf[4081] = 0240;
355 buf[4082] = 0344;
356 buf[4083] = 0112;
357 buf[4084] = 0173;
358 buf[4085] = 0240;
359 buf[4086] = 0344;
360 buf[4087] = 0112;
361buf[4088] = 01;
362
363 // put root block
364 xlseek(fd, block * blocksize, SEEK_SET);
365 xwrite(fd, buf, blocksize);
366
367 // cleanup
368 if (ENABLE_FEATURE_CLEAN_UP) {
369 free(buf);
370 free(sb);
371 }
372
373 xclose(fd);
374 return EXIT_SUCCESS;
375}