Contents of /trunk/mkinitrd-magellan/busybox/util-linux/mkfs_reiser.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 13392 byte(s)
-updated to busybox-1.17.1
1 | /* 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 | * |
7 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
8 | */ |
9 | #include "libbb.h" |
10 | #include <linux/fs.h> |
11 | |
12 | char BUG_wrong_field_size(void); |
13 | #define STORE_LE(field, value) \ |
14 | do { \ |
15 | if (sizeof(field) == 4) \ |
16 | field = SWAP_LE32(value); \ |
17 | else if (sizeof(field) == 2) \ |
18 | field = SWAP_LE16(value); \ |
19 | else if (sizeof(field) == 1) \ |
20 | field = (value); \ |
21 | else \ |
22 | BUG_wrong_field_size(); \ |
23 | } while (0) |
24 | |
25 | #define FETCH_LE32(field) \ |
26 | (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size()) |
27 | |
28 | struct journal_params { |
29 | uint32_t jp_journal_1st_block; /* where does journal start from on its device */ |
30 | uint32_t jp_journal_dev; /* journal device st_rdev */ |
31 | uint32_t jp_journal_size; /* size of the journal on FS creation. used to make sure they don't overflow it */ |
32 | uint32_t jp_journal_trans_max; /* max number of blocks in a transaction. */ |
33 | uint32_t jp_journal_magic; /* random value made on fs creation (this was sb_journal_block_count) */ |
34 | uint32_t jp_journal_max_batch; /* max number of blocks to batch into a trans */ |
35 | uint32_t jp_journal_max_commit_age; /* in seconds, how old can an async commit be */ |
36 | uint32_t jp_journal_max_trans_age; /* in seconds, how old can a transaction be */ |
37 | }; |
38 | |
39 | struct reiserfs_journal_header { |
40 | uint32_t jh_last_flush_trans_id; /* id of last fully flushed transaction */ |
41 | uint32_t jh_first_unflushed_offset; /* offset in the log of where to start replay after a crash */ |
42 | uint32_t jh_mount_id; |
43 | struct journal_params jh_journal; |
44 | uint32_t jh_last_check_mount_id; /* the mount id of the fs during the last reiserfsck --check. */ |
45 | }; |
46 | |
47 | struct reiserfs_super_block { |
48 | uint32_t sb_block_count; /* 0 number of block on data device */ |
49 | uint32_t sb_free_blocks; /* 4 free blocks count */ |
50 | uint32_t sb_root_block; /* 8 root of the tree */ |
51 | |
52 | struct journal_params sb_journal; /* 12 */ |
53 | |
54 | uint16_t sb_blocksize; /* 44 */ |
55 | uint16_t sb_oid_maxsize; /* 46 max size of object id array, see get_objectid() commentary */ |
56 | uint16_t sb_oid_cursize; /* 48 current size of object id array */ |
57 | uint16_t sb_umount_state; /* 50 this is set to 1 when filesystem was umounted, to 2 - when not */ |
58 | |
59 | char s_magic[10]; /* 52 "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */ |
60 | 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) */ |
61 | 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 */ |
62 | uint16_t sb_tree_height; /* 68 height of filesytem tree. Tree consisting of only one root block has 2 here */ |
63 | uint16_t sb_bmap_nr; /* 70 amount of bitmap blocks needed to address each block of file system */ |
64 | uint16_t sb_version; /* 72 this field is only reliable on filesystem with non-standard journal */ |
65 | 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 */ |
66 | uint32_t sb_inode_generation; /* 76 */ |
67 | uint32_t sb_flags; /* 80 Right now used only by inode-attributes, if enabled */ |
68 | unsigned char s_uuid[16]; /* 84 filesystem unique identifier */ |
69 | unsigned char s_label[16]; /* 100 filesystem volume label */ |
70 | uint16_t sb_mnt_count; /* 116 */ |
71 | uint16_t sb_max_mnt_count; /* 118 */ |
72 | uint32_t sb_lastcheck; /* 120 */ |
73 | uint32_t sb_check_interval; /* 124 */ |
74 | /* zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() so any additions must be updated there as well. */ |
75 | char s_unused[76]; /* 128 */ |
76 | /* 204 */ |
77 | }; |
78 | |
79 | /* Header of a disk block. More precisely, header of a formatted leaf |
80 | or internal node, and not the header of an unformatted node. */ |
81 | struct block_head { |
82 | uint16_t blk2_level; /* Level of a block in the tree. */ |
83 | uint16_t blk2_nr_item; /* Number of keys/items in a block. */ |
84 | uint16_t blk2_free_space; /* Block free space in bytes. */ |
85 | uint16_t blk_reserved; |
86 | uint32_t reserved[4]; |
87 | }; |
88 | |
89 | #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024) |
90 | |
91 | #define REISERFS_3_6_SUPER_MAGIC_STRING "ReIsEr2Fs" |
92 | #define REISERFS_FORMAT_3_6 2 |
93 | #define DEFAULT_MAX_MNT_COUNT 30 /* 30 mounts */ |
94 | #define DEFAULT_CHECK_INTERVAL (180 * 60 * 60 * 24) /* 180 days */ |
95 | |
96 | #define FS_CLEANLY_UMOUNTED 1 /* this was REISERFS_VALID_FS */ |
97 | |
98 | #define JOURNAL_MIN_SIZE 512 |
99 | /* biggest possible single transaction, don't change for now (8/3/99) */ |
100 | #define JOURNAL_TRANS_MAX 1024 |
101 | #define JOURNAL_TRANS_MIN 256 /* need to check whether it works */ |
102 | #define JOURNAL_DEFAULT_RATIO 8 /* default journal size / max trans length */ |
103 | #define JOURNAL_MIN_RATIO 2 |
104 | /* max blocks to batch into one transaction, don't make this any bigger than 900 */ |
105 | #define JOURNAL_MAX_BATCH 900 |
106 | #define JOURNAL_MAX_COMMIT_AGE 30 |
107 | |
108 | |
109 | // Standard mkreiserfs 3.6.21: |
110 | // -b | --block-size N size of file-system block, in bytes |
111 | // -j | --journal-device FILE path to separate device to hold journal |
112 | // -s | --journal-size N size of the journal in blocks |
113 | // -o | --journal-offset N offset of the journal from the start of |
114 | // the separate device, in blocks |
115 | // -t | --transaction-max-size N maximal size of transaction, in blocks |
116 | // -B | --badblocks file store all bad blocks given in file on the fs |
117 | // -h | --hash rupasov|tea|r5 hash function to use by default |
118 | // -u | --uuid UUID store UUID in the superblock |
119 | // -l | --label LABEL store LABEL in the superblock |
120 | // --format 3.5|3.6 old 3.5 format or newer 3.6 |
121 | // -f | --force specified once, make mkreiserfs the whole |
122 | // disk, not block device or mounted partition; |
123 | // specified twice, do not ask for confirmation |
124 | // -q | --quiet quiet work without messages, progress and |
125 | // questions. Useful if run in a script. For use |
126 | // by end users only. |
127 | // -d | --debug print debugging information during mkreiser |
128 | // -V print version and exit |
129 | |
130 | // Options not commented below are taken but silently ignored: |
131 | enum { |
132 | OPT_b = 1 << 0, |
133 | OPT_j = 1 << 1, |
134 | OPT_s = 1 << 2, |
135 | OPT_o = 1 << 3, |
136 | OPT_t = 1 << 4, |
137 | OPT_B = 1 << 5, |
138 | OPT_h = 1 << 6, |
139 | OPT_u = 1 << 7, |
140 | OPT_l = 1 << 8, // label |
141 | OPT_f = 1 << 9, // ask no questions |
142 | OPT_q = 1 << 10, |
143 | OPT_d = 1 << 11, |
144 | //OPT_V = 1 << 12, // -V version. bbox applets don't support that |
145 | }; |
146 | |
147 | int mkfs_reiser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
148 | int mkfs_reiser_main(int argc UNUSED_PARAM, char **argv) |
149 | { |
150 | unsigned blocksize = 4096; |
151 | unsigned journal_blocks = 8192; |
152 | unsigned blocks, bitmap_blocks, i, block; |
153 | time_t timestamp; |
154 | const char *label = ""; |
155 | struct stat st; |
156 | int fd; |
157 | uint8_t *buf; |
158 | struct reiserfs_super_block *sb; |
159 | struct journal_params *jp; |
160 | struct block_head *root; |
161 | |
162 | // using global "option_mask32" instead of local "opts": |
163 | // we are register starved here |
164 | opt_complementary = "-1:b+"; |
165 | /*opts =*/ getopt32(argv, "b:j:s:o:t:B:h:u:l:fqd", |
166 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &label); |
167 | argv += optind; // argv[0] -- device |
168 | |
169 | // check the device is a block device |
170 | fd = xopen(argv[0], O_WRONLY | O_EXCL); |
171 | fstat(fd, &st); |
172 | if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_f)) |
173 | bb_error_msg_and_die("not a block device"); |
174 | |
175 | // check if it is mounted |
176 | // N.B. what if we format a file? find_mount_point will return false negative since |
177 | // it is loop block device which is mounted! |
178 | if (find_mount_point(argv[0], 0)) |
179 | bb_error_msg_and_die("can't format mounted filesystem"); |
180 | |
181 | // open the device, get size in blocks |
182 | blocks = get_volume_size_in_bytes(fd, argv[1], blocksize, /*extend:*/ 1) / blocksize; |
183 | |
184 | // block number sanity check |
185 | // we have a limit: skipped area, super block, journal and root block |
186 | // all have to be addressed by one first bitmap |
187 | block = REISERFS_DISK_OFFSET_IN_BYTES / blocksize // boot area |
188 | + 1 // sb |
189 | + 1 // bitmap#0 |
190 | + journal_blocks+1 // journal |
191 | ; |
192 | |
193 | // count overhead |
194 | bitmap_blocks = (blocks - 1) / (blocksize * 8) + 1; |
195 | i = block + bitmap_blocks; |
196 | |
197 | // check overhead |
198 | if (MIN(blocksize * 8, blocks) < i) |
199 | bb_error_msg_and_die("need >= %u blocks", i); |
200 | |
201 | // ask confirmation? |
202 | // TODO: ??? |
203 | |
204 | // wipe out first REISERFS_DISK_OFFSET_IN_BYTES of device |
205 | // TODO: do we really need to wipe?! |
206 | xlseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET); |
207 | |
208 | // fill superblock |
209 | sb = (struct reiserfs_super_block *)xzalloc(blocksize); |
210 | // block count |
211 | STORE_LE(sb->sb_block_count, blocks); |
212 | STORE_LE(sb->sb_free_blocks, blocks - i); |
213 | // TODO: decypher! |
214 | STORE_LE(sb->sb_root_block, block); |
215 | // fill journal related fields |
216 | jp = &sb->sb_journal; |
217 | STORE_LE(jp->jp_journal_1st_block, REISERFS_DISK_OFFSET_IN_BYTES / blocksize + 1/*sb*/ + 1/*bmp#0*/); |
218 | timestamp = time(NULL); |
219 | srandom(timestamp); |
220 | STORE_LE(jp->jp_journal_magic, random()); |
221 | STORE_LE(jp->jp_journal_size, journal_blocks); |
222 | STORE_LE(jp->jp_journal_trans_max, JOURNAL_TRANS_MAX); |
223 | STORE_LE(jp->jp_journal_max_batch, JOURNAL_MAX_BATCH); |
224 | STORE_LE(jp->jp_journal_max_commit_age, JOURNAL_MAX_COMMIT_AGE); |
225 | // sizes |
226 | STORE_LE(sb->sb_blocksize, blocksize); |
227 | STORE_LE(sb->sb_oid_maxsize, (blocksize - sizeof(*sb)) / sizeof(uint32_t) / 2 * 2); |
228 | STORE_LE(sb->sb_oid_cursize, 2); // "." and ".." |
229 | strcpy(sb->s_magic, REISERFS_3_6_SUPER_MAGIC_STRING); |
230 | STORE_LE(sb->sb_bmap_nr, (bitmap_blocks > ((1LL << 16) - 1)) ? 0 : bitmap_blocks); |
231 | // misc |
232 | STORE_LE(sb->sb_version, REISERFS_FORMAT_3_6); |
233 | STORE_LE(sb->sb_lastcheck, timestamp); |
234 | STORE_LE(sb->sb_check_interval, DEFAULT_CHECK_INTERVAL); |
235 | STORE_LE(sb->sb_mnt_count, 1); |
236 | STORE_LE(sb->sb_max_mnt_count, DEFAULT_MAX_MNT_COUNT); |
237 | STORE_LE(sb->sb_umount_state, FS_CLEANLY_UMOUNTED); |
238 | STORE_LE(sb->sb_tree_height, 2); |
239 | STORE_LE(sb->sb_hash_function_code, 3); // R5_HASH |
240 | STORE_LE(sb->sb_flags, 1); |
241 | //STORE_LE(sb->sb_reserved_for_journal, 0); |
242 | // create UUID |
243 | generate_uuid(sb->s_uuid); |
244 | // write the label |
245 | safe_strncpy((char *)sb->s_label, label, sizeof(sb->s_label)); |
246 | |
247 | // TODO: EMPIRIC! ENDIANNESS! |
248 | // superblock has only 204 bytes. What are these? |
249 | buf = (uint8_t *)sb; |
250 | buf[205] = 1; |
251 | buf[209] = 3; |
252 | |
253 | // put superblock |
254 | xwrite(fd, sb, blocksize); |
255 | |
256 | // create bitmaps |
257 | buf = xzalloc(blocksize); |
258 | |
259 | // bitmap #0 uses initial "block"+1 blocks |
260 | i = block + 1; |
261 | memset(buf, 0xFF, i / 8); |
262 | buf[i / 8] = (1 << (i & 7)) - 1; //0..7 => 00000000..01111111 |
263 | // mark trailing absent blocks, if any |
264 | if (blocks < 8*blocksize) { |
265 | unsigned n = 8*blocksize - blocks; |
266 | i = n / 8; |
267 | buf[blocksize - i - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110 |
268 | memset(buf + blocksize - i, 0xFF, i); // N.B. no overflow here! |
269 | } |
270 | // put bitmap #0 |
271 | xwrite(fd, buf, blocksize); |
272 | |
273 | // now go journal blocks |
274 | memset(buf, 0, blocksize); |
275 | for (i = 0; i < journal_blocks; i++) |
276 | xwrite(fd, buf, blocksize); |
277 | // dump journal control block |
278 | memcpy(&((struct reiserfs_journal_header *)buf)->jh_journal, &sb->sb_journal, sizeof(sb->sb_journal)); |
279 | xwrite(fd, buf, blocksize); |
280 | |
281 | // other bitmaps are in every (8*blocksize)-th block |
282 | // N.B. they use the only block -- namely bitmap itself! |
283 | buf[0] = 0x01; |
284 | // put bitmaps |
285 | for (i = 1; i < bitmap_blocks; i++) { |
286 | xlseek(fd, i*8*blocksize * blocksize, SEEK_SET); |
287 | // mark trailing absent blocks, if any |
288 | if (i == bitmap_blocks - 1 && (blocks % (8*blocksize))) { |
289 | unsigned n = 8*blocksize - blocks % (8*blocksize); |
290 | unsigned j = n / 8; |
291 | buf[blocksize - j - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110 |
292 | memset(buf + blocksize - j, 0xFF, j); // N.B. no overflow here! |
293 | } |
294 | xwrite(fd, buf, blocksize); |
295 | } |
296 | |
297 | // fill root block |
298 | // block head |
299 | memset(buf, 0, blocksize); |
300 | root = (struct block_head *)buf; |
301 | STORE_LE(root->blk2_level, 1); // leaf node |
302 | STORE_LE(root->blk2_nr_item, 2); // "." and ".." |
303 | STORE_LE(root->blk2_free_space, blocksize - sizeof(struct block_head)); |
304 | // item head |
305 | // root directory |
306 | // TODO: EMPIRIC! ENDIANNESS! |
307 | // TODO: indented assignments seem to be timestamps |
308 | buf[4] = 0134; |
309 | buf[24] = 01; |
310 | buf[28] = 02; |
311 | buf[42] = 054; |
312 | buf[44] = 0324; |
313 | buf[45] = 017; |
314 | buf[46] = 01; |
315 | buf[48] = 01; |
316 | buf[52] = 02; |
317 | buf[56] = 01; |
318 | buf[60] = 0364; |
319 | buf[61] = 01; |
320 | buf[64] = 02; |
321 | buf[66] = 060; |
322 | buf[68] = 0244; |
323 | buf[69] = 017; |
324 | buf[4004] = 01; |
325 | buf[4008] = 01; |
326 | buf[4012] = 02; |
327 | buf[4016] = 050; |
328 | buf[4018] = 04; |
329 | buf[4020] = 02; |
330 | buf[4028] = 01; |
331 | buf[4032] = 040; |
332 | buf[4034] = 04; |
333 | |
334 | buf[4036] = 056; buf[4037] = 056; // ".." |
335 | buf[4044] = 056; // "." |
336 | |
337 | buf[4052] = 0355; |
338 | buf[4053] = 0101; |
339 | buf[4056] = 03; |
340 | buf[4060] = 060; |
341 | buf[4076] = 0173; |
342 | buf[4077] = 0240; |
343 | buf[4078] = 0344; |
344 | buf[4079] = 0112; |
345 | buf[4080] = 0173; |
346 | buf[4081] = 0240; |
347 | buf[4082] = 0344; |
348 | buf[4083] = 0112; |
349 | buf[4084] = 0173; |
350 | buf[4085] = 0240; |
351 | buf[4086] = 0344; |
352 | buf[4087] = 0112; |
353 | buf[4088] = 01; |
354 | |
355 | // put root block |
356 | xlseek(fd, block * blocksize, SEEK_SET); |
357 | xwrite(fd, buf, blocksize); |
358 | |
359 | // cleanup |
360 | if (ENABLE_FEATURE_CLEAN_UP) { |
361 | free(buf); |
362 | free(sb); |
363 | } |
364 | |
365 | xclose(fd); |
366 | return EXIT_SUCCESS; |
367 | } |