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[S390] dasd: enable compat ioctls
[linux/fpc-iii.git] / fs / ubifs / sb.c
blobe070c643d1bb180b0099c7674f9703d4be0870ce
1 /*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
20 * Adrian Hunter
21 */
22
23 /*
24 * This file implements UBIFS superblock. The superblock is stored at the first
25 * LEB of the volume and is never changed by UBIFS. Only user-space tools may
26 * change it. The superblock node mostly contains geometry information.
27 */
28
29 #include "ubifs.h"
30 #include <linux/random.h>
31 #include <linux/math64.h>
32
33 /*
34 * Default journal size in logical eraseblocks as a percent of total
35 * flash size.
36 */
37 #define DEFAULT_JNL_PERCENT 5
38
39 /* Default maximum journal size in bytes */
40 #define DEFAULT_MAX_JNL (32*1024*1024)
41
42 /* Default indexing tree fanout */
43 #define DEFAULT_FANOUT 8
44
45 /* Default number of data journal heads */
46 #define DEFAULT_JHEADS_CNT 1
47
48 /* Default positions of different LEBs in the main area */
49 #define DEFAULT_IDX_LEB 0
50 #define DEFAULT_DATA_LEB 1
51 #define DEFAULT_GC_LEB 2
52
53 /* Default number of LEB numbers in LPT's save table */
54 #define DEFAULT_LSAVE_CNT 256
55
56 /* Default reserved pool size as a percent of maximum free space */
57 #define DEFAULT_RP_PERCENT 5
58
59 /* The default maximum size of reserved pool in bytes */
60 #define DEFAULT_MAX_RP_SIZE (5*1024*1024)
61
62 /* Default time granularity in nanoseconds */
63 #define DEFAULT_TIME_GRAN 1000000000
64
65 /**
66 * create_default_filesystem - format empty UBI volume.
67 * @c: UBIFS file-system description object
68 *
69 * This function creates default empty file-system. Returns zero in case of
70 * success and a negative error code in case of failure.
71 */
72 static int create_default_filesystem(struct ubifs_info *c)
73 {
74 struct ubifs_sb_node *sup;
75 struct ubifs_mst_node *mst;
76 struct ubifs_idx_node *idx;
77 struct ubifs_branch *br;
78 struct ubifs_ino_node *ino;
79 struct ubifs_cs_node *cs;
80 union ubifs_key key;
81 int err, tmp, jnl_lebs, log_lebs, max_buds, main_lebs, main_first;
82 int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0;
83 int min_leb_cnt = UBIFS_MIN_LEB_CNT;
84 long long tmp64, main_bytes;
85 __le64 tmp_le64;
86
87 /* Some functions called from here depend on the @c->key_len filed */
88 c->key_len = UBIFS_SK_LEN;
89
90 /*
91 * First of all, we have to calculate default file-system geometry -
92 * log size, journal size, etc.
93 */
94 if (c->leb_cnt < 0x7FFFFFFF / DEFAULT_JNL_PERCENT)
95 /* We can first multiply then divide and have no overflow */
96 jnl_lebs = c->leb_cnt * DEFAULT_JNL_PERCENT / 100;
97 else
98 jnl_lebs = (c->leb_cnt / 100) * DEFAULT_JNL_PERCENT;
99
100 if (jnl_lebs < UBIFS_MIN_JNL_LEBS)
101 jnl_lebs = UBIFS_MIN_JNL_LEBS;
102 if (jnl_lebs * c->leb_size > DEFAULT_MAX_JNL)
103 jnl_lebs = DEFAULT_MAX_JNL / c->leb_size;
104
105 /*
106 * The log should be large enough to fit reference nodes for all bud
107 * LEBs. Because buds do not have to start from the beginning of LEBs
108 * (half of the LEB may contain committed data), the log should
109 * generally be larger, make it twice as large.
110 */
111 tmp = 2 * (c->ref_node_alsz * jnl_lebs) + c->leb_size - 1;
112 log_lebs = tmp / c->leb_size;
113 /* Plus one LEB reserved for commit */
114 log_lebs += 1;
115 if (c->leb_cnt - min_leb_cnt > 8) {
116 /* And some extra space to allow writes while committing */
117 log_lebs += 1;
118 min_leb_cnt += 1;
119 }
120
121 max_buds = jnl_lebs - log_lebs;
122 if (max_buds < UBIFS_MIN_BUD_LEBS)
123 max_buds = UBIFS_MIN_BUD_LEBS;
124
125 /*
126 * Orphan nodes are stored in a separate area. One node can store a lot
127 * of orphan inode numbers, but when new orphan comes we just add a new
128 * orphan node. At some point the nodes are consolidated into one
129 * orphan node.
130 */
131 orph_lebs = UBIFS_MIN_ORPH_LEBS;
132 #ifdef CONFIG_UBIFS_FS_DEBUG
133 if (c->leb_cnt - min_leb_cnt > 1)
134 /*
135 * For debugging purposes it is better to have at least 2
136 * orphan LEBs, because the orphan subsystem would need to do
137 * consolidations and would be stressed more.
138 */
139 orph_lebs += 1;
140 #endif
141
142 main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - log_lebs;
143 main_lebs -= orph_lebs;
144
145 lpt_first = UBIFS_LOG_LNUM + log_lebs;
146 c->lsave_cnt = DEFAULT_LSAVE_CNT;
147 c->max_leb_cnt = c->leb_cnt;
148 err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs,
149 &big_lpt);
150 if (err)
151 return err;
152
153 dbg_gen("LEB Properties Tree created (LEBs %d-%d)", lpt_first,
154 lpt_first + lpt_lebs - 1);
155
156 main_first = c->leb_cnt - main_lebs;
157
158 /* Create default superblock */
159 tmp = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size);
160 sup = kzalloc(tmp, GFP_KERNEL);
161 if (!sup)
162 return -ENOMEM;
163
164 tmp64 = (long long)max_buds * c->leb_size;
165 if (big_lpt)
166 sup_flags |= UBIFS_FLG_BIGLPT;
167
168 sup->ch.node_type = UBIFS_SB_NODE;
169 sup->key_hash = UBIFS_KEY_HASH_R5;
170 sup->flags = cpu_to_le32(sup_flags);
171 sup->min_io_size = cpu_to_le32(c->min_io_size);
172 sup->leb_size = cpu_to_le32(c->leb_size);
173 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
174 sup->max_leb_cnt = cpu_to_le32(c->max_leb_cnt);
175 sup->max_bud_bytes = cpu_to_le64(tmp64);
176 sup->log_lebs = cpu_to_le32(log_lebs);
177 sup->lpt_lebs = cpu_to_le32(lpt_lebs);
178 sup->orph_lebs = cpu_to_le32(orph_lebs);
179 sup->jhead_cnt = cpu_to_le32(DEFAULT_JHEADS_CNT);
180 sup->fanout = cpu_to_le32(DEFAULT_FANOUT);
181 sup->lsave_cnt = cpu_to_le32(c->lsave_cnt);
182 sup->fmt_version = cpu_to_le32(UBIFS_FORMAT_VERSION);
183 sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN);
184 if (c->mount_opts.override_compr)
185 sup->default_compr = cpu_to_le16(c->mount_opts.compr_type);
186 else
187 sup->default_compr = cpu_to_le16(UBIFS_COMPR_LZO);
188
189 generate_random_uuid(sup->uuid);
190
191 main_bytes = (long long)main_lebs * c->leb_size;
192 tmp64 = div_u64(main_bytes * DEFAULT_RP_PERCENT, 100);
193 if (tmp64 > DEFAULT_MAX_RP_SIZE)
194 tmp64 = DEFAULT_MAX_RP_SIZE;
195 sup->rp_size = cpu_to_le64(tmp64);
196
197 err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0, UBI_LONGTERM);
198 kfree(sup);
199 if (err)
200 return err;
201
202 dbg_gen("default superblock created at LEB 0:0");
203
204 /* Create default master node */
205 mst = kzalloc(c->mst_node_alsz, GFP_KERNEL);
206 if (!mst)
207 return -ENOMEM;
208
209 mst->ch.node_type = UBIFS_MST_NODE;
210 mst->log_lnum = cpu_to_le32(UBIFS_LOG_LNUM);
211 mst->highest_inum = cpu_to_le64(UBIFS_FIRST_INO);
212 mst->cmt_no = 0;
213 mst->root_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB);
214 mst->root_offs = 0;
215 tmp = ubifs_idx_node_sz(c, 1);
216 mst->root_len = cpu_to_le32(tmp);
217 mst->gc_lnum = cpu_to_le32(main_first + DEFAULT_GC_LEB);
218 mst->ihead_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB);
219 mst->ihead_offs = cpu_to_le32(ALIGN(tmp, c->min_io_size));
220 mst->index_size = cpu_to_le64(ALIGN(tmp, 8));
221 mst->lpt_lnum = cpu_to_le32(c->lpt_lnum);
222 mst->lpt_offs = cpu_to_le32(c->lpt_offs);
223 mst->nhead_lnum = cpu_to_le32(c->nhead_lnum);
224 mst->nhead_offs = cpu_to_le32(c->nhead_offs);
225 mst->ltab_lnum = cpu_to_le32(c->ltab_lnum);
226 mst->ltab_offs = cpu_to_le32(c->ltab_offs);
227 mst->lsave_lnum = cpu_to_le32(c->lsave_lnum);
228 mst->lsave_offs = cpu_to_le32(c->lsave_offs);
229 mst->lscan_lnum = cpu_to_le32(main_first);
230 mst->empty_lebs = cpu_to_le32(main_lebs - 2);
231 mst->idx_lebs = cpu_to_le32(1);
232 mst->leb_cnt = cpu_to_le32(c->leb_cnt);
233
234 /* Calculate lprops statistics */
235 tmp64 = main_bytes;
236 tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size);
237 tmp64 -= ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size);
238 mst->total_free = cpu_to_le64(tmp64);
239
240 tmp64 = ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size);
241 ino_waste = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size) -
242 UBIFS_INO_NODE_SZ;
243 tmp64 += ino_waste;
244 tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), 8);
245 mst->total_dirty = cpu_to_le64(tmp64);
246
247 /* The indexing LEB does not contribute to dark space */
248 tmp64 = (c->main_lebs - 1) * c->dark_wm;
249 mst->total_dark = cpu_to_le64(tmp64);
250
251 mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ);
252
253 err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0,
254 UBI_UNKNOWN);
255 if (err) {
256 kfree(mst);
257 return err;
258 }
259 err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, 0,
260 UBI_UNKNOWN);
261 kfree(mst);
262 if (err)
263 return err;
264
265 dbg_gen("default master node created at LEB %d:0", UBIFS_MST_LNUM);
266
267 /* Create the root indexing node */
268 tmp = ubifs_idx_node_sz(c, 1);
269 idx = kzalloc(ALIGN(tmp, c->min_io_size), GFP_KERNEL);
270 if (!idx)
271 return -ENOMEM;
272
273 c->key_fmt = UBIFS_SIMPLE_KEY_FMT;
274 c->key_hash = key_r5_hash;
275
276 idx->ch.node_type = UBIFS_IDX_NODE;
277 idx->child_cnt = cpu_to_le16(1);
278 ino_key_init(c, &key, UBIFS_ROOT_INO);
279 br = ubifs_idx_branch(c, idx, 0);
280 key_write_idx(c, &key, &br->key);
281 br->lnum = cpu_to_le32(main_first + DEFAULT_DATA_LEB);
282 br->len = cpu_to_le32(UBIFS_INO_NODE_SZ);
283 err = ubifs_write_node(c, idx, tmp, main_first + DEFAULT_IDX_LEB, 0,
284 UBI_UNKNOWN);
285 kfree(idx);
286 if (err)
287 return err;
288
289 dbg_gen("default root indexing node created LEB %d:0",
290 main_first + DEFAULT_IDX_LEB);
291
292 /* Create default root inode */
293 tmp = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size);
294 ino = kzalloc(tmp, GFP_KERNEL);
295 if (!ino)
296 return -ENOMEM;
297
298 ino_key_init_flash(c, &ino->key, UBIFS_ROOT_INO);
299 ino->ch.node_type = UBIFS_INO_NODE;
300 ino->creat_sqnum = cpu_to_le64(++c->max_sqnum);
301 ino->nlink = cpu_to_le32(2);
302 tmp_le64 = cpu_to_le64(CURRENT_TIME_SEC.tv_sec);
303 ino->atime_sec = tmp_le64;
304 ino->ctime_sec = tmp_le64;
305 ino->mtime_sec = tmp_le64;
306 ino->atime_nsec = 0;
307 ino->ctime_nsec = 0;
308 ino->mtime_nsec = 0;
309 ino->mode = cpu_to_le32(S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
310 ino->size = cpu_to_le64(UBIFS_INO_NODE_SZ);
311
312 /* Set compression enabled by default */
313 ino->flags = cpu_to_le32(UBIFS_COMPR_FL);
314
315 err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ,
316 main_first + DEFAULT_DATA_LEB, 0,
317 UBI_UNKNOWN);
318 kfree(ino);
319 if (err)
320 return err;
321
322 dbg_gen("root inode created at LEB %d:0",
323 main_first + DEFAULT_DATA_LEB);
324
325 /*
326 * The first node in the log has to be the commit start node. This is
327 * always the case during normal file-system operation. Write a fake
328 * commit start node to the log.
329 */
330 tmp = ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size);
331 cs = kzalloc(tmp, GFP_KERNEL);
332 if (!cs)
333 return -ENOMEM;
334
335 cs->ch.node_type = UBIFS_CS_NODE;
336 err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM,
337 0, UBI_UNKNOWN);
338 kfree(cs);
339
340 ubifs_msg("default file-system created");
341 return 0;
342 }
343
344 /**
345 * validate_sb - validate superblock node.
346 * @c: UBIFS file-system description object
347 * @sup: superblock node
348 *
349 * This function validates superblock node @sup. Since most of data was read
350 * from the superblock and stored in @c, the function validates fields in @c
351 * instead. Returns zero in case of success and %-EINVAL in case of validation
352 * failure.
353 */
354 static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
355 {
356 long long max_bytes;
357 int err = 1, min_leb_cnt;
358
359 if (!c->key_hash) {
360 err = 2;
361 goto failed;
362 }
363
364 if (sup->key_fmt != UBIFS_SIMPLE_KEY_FMT) {
365 err = 3;
366 goto failed;
367 }
368
369 if (le32_to_cpu(sup->min_io_size) != c->min_io_size) {
370 ubifs_err("min. I/O unit mismatch: %d in superblock, %d real",
371 le32_to_cpu(sup->min_io_size), c->min_io_size);
372 goto failed;
373 }
374
375 if (le32_to_cpu(sup->leb_size) != c->leb_size) {
376 ubifs_err("LEB size mismatch: %d in superblock, %d real",
377 le32_to_cpu(sup->leb_size), c->leb_size);
378 goto failed;
379 }
380
381 if (c->log_lebs < UBIFS_MIN_LOG_LEBS ||
382 c->lpt_lebs < UBIFS_MIN_LPT_LEBS ||
383 c->orph_lebs < UBIFS_MIN_ORPH_LEBS ||
384 c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
385 err = 4;
386 goto failed;
387 }
388
389 /*
390 * Calculate minimum allowed amount of main area LEBs. This is very
391 * similar to %UBIFS_MIN_LEB_CNT, but we take into account real what we
392 * have just read from the superblock.
393 */
394 min_leb_cnt = UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs;
395 min_leb_cnt += c->lpt_lebs + c->orph_lebs + c->jhead_cnt + 6;
396
397 if (c->leb_cnt < min_leb_cnt || c->leb_cnt > c->vi.size) {
398 ubifs_err("bad LEB count: %d in superblock, %d on UBI volume, "
399 "%d minimum required", c->leb_cnt, c->vi.size,
400 min_leb_cnt);
401 goto failed;
402 }
403
404 if (c->max_leb_cnt < c->leb_cnt) {
405 ubifs_err("max. LEB count %d less than LEB count %d",
406 c->max_leb_cnt, c->leb_cnt);
407 goto failed;
408 }
409
410 if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
411 err = 7;
412 goto failed;
413 }
414
415 if (c->max_bud_bytes < (long long)c->leb_size * UBIFS_MIN_BUD_LEBS ||
416 c->max_bud_bytes > (long long)c->leb_size * c->main_lebs) {
417 err = 8;
418 goto failed;
419 }
420
421 if (c->jhead_cnt < NONDATA_JHEADS_CNT + 1 ||
422 c->jhead_cnt > NONDATA_JHEADS_CNT + UBIFS_MAX_JHEADS) {
423 err = 9;
424 goto failed;
425 }
426
427 if (c->fanout < UBIFS_MIN_FANOUT ||
428 ubifs_idx_node_sz(c, c->fanout) > c->leb_size) {
429 err = 10;
430 goto failed;
431 }
432
433 if (c->lsave_cnt < 0 || (c->lsave_cnt > DEFAULT_LSAVE_CNT &&
434 c->lsave_cnt > c->max_leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS -
435 c->log_lebs - c->lpt_lebs - c->orph_lebs)) {
436 err = 11;
437 goto failed;
438 }
439
440 if (UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs + c->lpt_lebs +
441 c->orph_lebs + c->main_lebs != c->leb_cnt) {
442 err = 12;
443 goto failed;
444 }
445
446 if (c->default_compr < 0 || c->default_compr >= UBIFS_COMPR_TYPES_CNT) {
447 err = 13;
448 goto failed;
449 }
450
451 max_bytes = c->main_lebs * (long long)c->leb_size;
452 if (c->rp_size < 0 || max_bytes < c->rp_size) {
453 err = 14;
454 goto failed;
455 }
456
457 if (le32_to_cpu(sup->time_gran) > 1000000000 ||
458 le32_to_cpu(sup->time_gran) < 1) {
459 err = 15;
460 goto failed;
461 }
462
463 return 0;
464
465 failed:
466 ubifs_err("bad superblock, error %d", err);
467 dbg_dump_node(c, sup);
468 return -EINVAL;
469 }
470
471 /**
472 * ubifs_read_sb_node - read superblock node.
473 * @c: UBIFS file-system description object
474 *
475 * This function returns a pointer to the superblock node or a negative error
476 * code.
477 */
478 struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
479 {
480 struct ubifs_sb_node *sup;
481 int err;
482
483 sup = kmalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_NOFS);
484 if (!sup)
485 return ERR_PTR(-ENOMEM);
486
487 err = ubifs_read_node(c, sup, UBIFS_SB_NODE, UBIFS_SB_NODE_SZ,
488 UBIFS_SB_LNUM, 0);
489 if (err) {
490 kfree(sup);
491 return ERR_PTR(err);
492 }
493
494 return sup;
495 }
496
497 /**
498 * ubifs_write_sb_node - write superblock node.
499 * @c: UBIFS file-system description object
500 * @sup: superblock node read with 'ubifs_read_sb_node()'
501 *
502 * This function returns %0 on success and a negative error code on failure.
503 */
504 int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup)
505 {
506 int len = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size);
507
508 ubifs_prepare_node(c, sup, UBIFS_SB_NODE_SZ, 1);
509 return ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len, UBI_LONGTERM);
510 }
511
512 /**
513 * ubifs_read_superblock - read superblock.
514 * @c: UBIFS file-system description object
515 *
516 * This function finds, reads and checks the superblock. If an empty UBI volume
517 * is being mounted, this function creates default superblock. Returns zero in
518 * case of success, and a negative error code in case of failure.
519 */
520 int ubifs_read_superblock(struct ubifs_info *c)
521 {
522 int err, sup_flags;
523 struct ubifs_sb_node *sup;
524
525 if (c->empty) {
526 err = create_default_filesystem(c);
527 if (err)
528 return err;
529 }
530
531 sup = ubifs_read_sb_node(c);
532 if (IS_ERR(sup))
533 return PTR_ERR(sup);
534
535 /*
536 * The software supports all previous versions but not future versions,
537 * due to the unavailability of time-travelling equipment.
538 */
539 c->fmt_version = le32_to_cpu(sup->fmt_version);
540 if (c->fmt_version > UBIFS_FORMAT_VERSION) {
541 ubifs_err("on-flash format version is %d, but software only "
542 "supports up to version %d", c->fmt_version,
543 UBIFS_FORMAT_VERSION);
544 err = -EINVAL;
545 goto out;
546 }
547
548 if (c->fmt_version < 3) {
549 ubifs_err("on-flash format version %d is not supported",
550 c->fmt_version);
551 err = -EINVAL;
552 goto out;
553 }
554
555 switch (sup->key_hash) {
556 case UBIFS_KEY_HASH_R5:
557 c->key_hash = key_r5_hash;
558 c->key_hash_type = UBIFS_KEY_HASH_R5;
559 break;
560
561 case UBIFS_KEY_HASH_TEST:
562 c->key_hash = key_test_hash;
563 c->key_hash_type = UBIFS_KEY_HASH_TEST;
564 break;
565 };
566
567 c->key_fmt = sup->key_fmt;
568
569 switch (c->key_fmt) {
570 case UBIFS_SIMPLE_KEY_FMT:
571 c->key_len = UBIFS_SK_LEN;
572 break;
573 default:
574 ubifs_err("unsupported key format");
575 err = -EINVAL;
576 goto out;
577 }
578
579 c->leb_cnt = le32_to_cpu(sup->leb_cnt);
580 c->max_leb_cnt = le32_to_cpu(sup->max_leb_cnt);
581 c->max_bud_bytes = le64_to_cpu(sup->max_bud_bytes);
582 c->log_lebs = le32_to_cpu(sup->log_lebs);
583 c->lpt_lebs = le32_to_cpu(sup->lpt_lebs);
584 c->orph_lebs = le32_to_cpu(sup->orph_lebs);
585 c->jhead_cnt = le32_to_cpu(sup->jhead_cnt) + NONDATA_JHEADS_CNT;
586 c->fanout = le32_to_cpu(sup->fanout);
587 c->lsave_cnt = le32_to_cpu(sup->lsave_cnt);
588 c->rp_size = le64_to_cpu(sup->rp_size);
589 c->rp_uid = le32_to_cpu(sup->rp_uid);
590 c->rp_gid = le32_to_cpu(sup->rp_gid);
591 sup_flags = le32_to_cpu(sup->flags);
592 if (!c->mount_opts.override_compr)
593 c->default_compr = le16_to_cpu(sup->default_compr);
594
595 c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran);
596 memcpy(&c->uuid, &sup->uuid, 16);
597 c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT);
598
599 /* Automatically increase file system size to the maximum size */
600 c->old_leb_cnt = c->leb_cnt;
601 if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) {
602 c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size);
603 if (c->vfs_sb->s_flags & MS_RDONLY)
604 dbg_mnt("Auto resizing (ro) from %d LEBs to %d LEBs",
605 c->old_leb_cnt, c->leb_cnt);
606 else {
607 dbg_mnt("Auto resizing (sb) from %d LEBs to %d LEBs",
608 c->old_leb_cnt, c->leb_cnt);
609 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
610 err = ubifs_write_sb_node(c, sup);
611 if (err)
612 goto out;
613 c->old_leb_cnt = c->leb_cnt;
614 }
615 }
616
617 c->log_bytes = (long long)c->log_lebs * c->leb_size;
618 c->log_last = UBIFS_LOG_LNUM + c->log_lebs - 1;
619 c->lpt_first = UBIFS_LOG_LNUM + c->log_lebs;
620 c->lpt_last = c->lpt_first + c->lpt_lebs - 1;
621 c->orph_first = c->lpt_last + 1;
622 c->orph_last = c->orph_first + c->orph_lebs - 1;
623 c->main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS;
624 c->main_lebs -= c->log_lebs + c->lpt_lebs + c->orph_lebs;
625 c->main_first = c->leb_cnt - c->main_lebs;
626 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
627
628 err = validate_sb(c, sup);
629 out:
630 kfree(sup);
631 return err;
632 }
Linux with added FPC-III support