1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004 Thomas Gleixner <tglx@linutronix.de>
6 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 * Modified debugged and enhanced by Thomas Gleixner <tglx@linutronix.de>
9 *
10 * For licensing information, see the file 'LICENCE' in this directory.
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/crc32.h>
18 #include <linux/mtd/nand.h>
19 #include <linux/jiffies.h>
20 #include <linux/sched.h>
21
22 #include "nodelist.h"
23
24 /* For testing write failures */
25 #undef BREAKME
26 #undef BREAKMEHEADER
27
28 #ifdef BREAKME
29 static unsigned char *brokenbuf;
30 #endif
31
32 #define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
33 #define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
34
35 /* max. erase failures before we mark a block bad */
36 #define MAX_ERASE_FAILURES 2
37
38 struct jffs2_inodirty {
39 uint32_t ino;
40 struct jffs2_inodirty *next;
41 };
42
43 static struct jffs2_inodirty inodirty_nomem;
44
45 static int jffs2_wbuf_pending_for_ino(struct jffs2_sb_info *c, uint32_t ino)
46 {
47 struct jffs2_inodirty *this = c->wbuf_inodes;
48
49 /* If a malloc failed, consider _everything_ dirty */
50 if (this == &inodirty_nomem)
51 return 1;
52
53 /* If ino == 0, _any_ non-GC writes mean 'yes' */
54 if (this && !ino)
55 return 1;
56
57 /* Look to see if the inode in question is pending in the wbuf */
58 while (this) {
59 if (this->ino == ino)
60 return 1;
61 this = this->next;
62 }
63 return 0;
64 }
65
66 static void jffs2_clear_wbuf_ino_list(struct jffs2_sb_info *c)
67 {
68 struct jffs2_inodirty *this;
69
70 this = c->wbuf_inodes;
71
72 if (this != &inodirty_nomem) {
73 while (this) {
74 struct jffs2_inodirty *next = this->next;
75 kfree(this);
76 this = next;
77 }
78 }
79 c->wbuf_inodes = NULL;
80 }
81
82 static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino)
83 {
84 struct jffs2_inodirty *new;
85
86 /* Mark the superblock dirty so that kupdated will flush... */
87 jffs2_erase_pending_trigger(c);
88
89 if (jffs2_wbuf_pending_for_ino(c, ino))
90 return;
91
92 new = kmalloc(sizeof(*new), GFP_KERNEL);
93 if (!new) {
94 D1(printk(KERN_DEBUG "No memory to allocate inodirty. Fallback to all considered dirty\n"));
95 jffs2_clear_wbuf_ino_list(c);
96 c->wbuf_inodes = &inodirty_nomem;
97 return;
98 }
99 new->ino = ino;
100 new->next = c->wbuf_inodes;
101 c->wbuf_inodes = new;
102 return;
103 }
104
105 static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c)
106 {
107 struct list_head *this, *next;
108 static int n;
109
110 if (list_empty(&c->erasable_pending_wbuf_list))
111 return;
112
113 list_for_each_safe(this, next, &c->erasable_pending_wbuf_list) {
114 struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
115
116 D1(printk(KERN_DEBUG "Removing eraseblock at 0x%08x from erasable_pending_wbuf_list...\n", jeb->offset));
117 list_del(this);
118 if ((jiffies + (n++)) & 127) {
119 /* Most of the time, we just erase it immediately. Otherwise we
120 spend ages scanning it on mount, etc. */
121 D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n"));
122 list_add_tail(&jeb->list, &c->erase_pending_list);
123 c->nr_erasing_blocks++;
124 jffs2_erase_pending_trigger(c);
125 } else {
126 /* Sometimes, however, we leave it elsewhere so it doesn't get
127 immediately reused, and we spread the load a bit. */
128 D1(printk(KERN_DEBUG "...and adding to erasable_list\n"));
129 list_add_tail(&jeb->list, &c->erasable_list);
130 }
131 }
132 }
133
134 #define REFILE_NOTEMPTY 0
135 #define REFILE_ANYWAY 1
136
137 static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int allow_empty)
138 {
139 D1(printk("About to refile bad block at %08x\n", jeb->offset));
140
141 /* File the existing block on the bad_used_list.... */
142 if (c->nextblock == jeb)
143 c->nextblock = NULL;
144 else /* Not sure this should ever happen... need more coffee */
145 list_del(&jeb->list);
146 if (jeb->first_node) {
147 D1(printk("Refiling block at %08x to bad_used_list\n", jeb->offset));
148 list_add(&jeb->list, &c->bad_used_list);
149 } else {
150 BUG_ON(allow_empty == REFILE_NOTEMPTY);
151 /* It has to have had some nodes or we couldn't be here */
152 D1(printk("Refiling block at %08x to erase_pending_list\n", jeb->offset));
153 list_add(&jeb->list, &c->erase_pending_list);
154 c->nr_erasing_blocks++;
155 jffs2_erase_pending_trigger(c);
156 }
157
158 if (!jffs2_prealloc_raw_node_refs(c, jeb, 1)) {
159 uint32_t oldfree = jeb->free_size;
160
161 jffs2_link_node_ref(c, jeb,
162 (jeb->offset+c->sector_size-oldfree) | REF_OBSOLETE,
163 oldfree, NULL);
164 /* convert to wasted */
165 c->wasted_size += oldfree;
166 jeb->wasted_size += oldfree;
167 c->dirty_size -= oldfree;
168 jeb->dirty_size -= oldfree;
169 }
170
171 jffs2_dbg_dump_block_lists_nolock(c);
172 jffs2_dbg_acct_sanity_check_nolock(c,jeb);
173 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
174 }
175
176 static struct jffs2_raw_node_ref **jffs2_incore_replace_raw(struct jffs2_sb_info *c,
177 struct jffs2_inode_info *f,
178 struct jffs2_raw_node_ref *raw,
179 union jffs2_node_union *node)
180 {
181 struct jffs2_node_frag *frag;
182 struct jffs2_full_dirent *fd;
183
184 dbg_noderef("incore_replace_raw: node at %p is {%04x,%04x}\n",
185 node, je16_to_cpu(node->u.magic), je16_to_cpu(node->u.nodetype));
186
187 BUG_ON(je16_to_cpu(node->u.magic) != 0x1985 &&
188 je16_to_cpu(node->u.magic) != 0);
189
190 switch (je16_to_cpu(node->u.nodetype)) {
191 case JFFS2_NODETYPE_INODE:
192 if (f->metadata && f->metadata->raw == raw) {
193 dbg_noderef("Will replace ->raw in f->metadata at %p\n", f->metadata);
194 return &f->metadata->raw;
195 }
196 frag = jffs2_lookup_node_frag(&f->fragtree, je32_to_cpu(node->i.offset));
197 BUG_ON(!frag);
198 /* Find a frag which refers to the full_dnode we want to modify */
199 while (!frag->node || frag->node->raw != raw) {
200 frag = frag_next(frag);
201 BUG_ON(!frag);
202 }
203 dbg_noderef("Will replace ->raw in full_dnode at %p\n", frag->node);
204 return &frag->node->raw;
205
206 case JFFS2_NODETYPE_DIRENT:
207 for (fd = f->dents; fd; fd = fd->next) {
208 if (fd->raw == raw) {
209 dbg_noderef("Will replace ->raw in full_dirent at %p\n", fd);
210 return &fd->raw;
211 }
212 }
213 BUG();
214
215 default:
216 dbg_noderef("Don't care about replacing raw for nodetype %x\n",
217 je16_to_cpu(node->u.nodetype));
218 break;
219 }
220 return NULL;
221 }
222
223 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
224 static int jffs2_verify_write(struct jffs2_sb_info *c, unsigned char *buf,
225 uint32_t ofs)
226 {
227 int ret;
228 size_t retlen;
229 char *eccstr;
230
231 ret = c->mtd->read(c->mtd, ofs, c->wbuf_pagesize, &retlen, c->wbuf_verify);
232 if (ret && ret != -EUCLEAN && ret != -EBADMSG) {
233 printk(KERN_WARNING "jffs2_verify_write(): Read back of page at %08x failed: %d\n", c->wbuf_ofs, ret);
234 return ret;
235 } else if (retlen != c->wbuf_pagesize) {
236 printk(KERN_WARNING "jffs2_verify_write(): Read back of page at %08x gave short read: %zd not %d.\n", ofs, retlen, c->wbuf_pagesize);
237 return -EIO;
238 }
239 if (!memcmp(buf, c->wbuf_verify, c->wbuf_pagesize))
240 return 0;
241
242 if (ret == -EUCLEAN)
243 eccstr = "corrected";
244 else if (ret == -EBADMSG)
245 eccstr = "correction failed";
246 else
247 eccstr = "OK or unused";
248
249 printk(KERN_WARNING "Write verify error (ECC %s) at %08x. Wrote:\n",
250 eccstr, c->wbuf_ofs);
251 print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1,
252 c->wbuf, c->wbuf_pagesize, 0);
253
254 printk(KERN_WARNING "Read back:\n");
255 print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1,
256 c->wbuf_verify, c->wbuf_pagesize, 0);
257
258 return -EIO;
259 }
260 #else
261 #define jffs2_verify_write(c,b,o) (0)
262 #endif
263
264 /* Recover from failure to write wbuf. Recover the nodes up to the
265 * wbuf, not the one which we were starting to try to write. */
266
267 static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
268 {
269 struct jffs2_eraseblock *jeb, *new_jeb;
270 struct jffs2_raw_node_ref *raw, *next, *first_raw = NULL;
271 size_t retlen;
272 int ret;
273 int nr_refile = 0;
274 unsigned char *buf;
275 uint32_t start, end, ofs, len;
276
277 jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
278
279 spin_lock(&c->erase_completion_lock);
280 if (c->wbuf_ofs % c->mtd->erasesize)
281 jffs2_block_refile(c, jeb, REFILE_NOTEMPTY);
282 else
283 jffs2_block_refile(c, jeb, REFILE_ANYWAY);
284 spin_unlock(&c->erase_completion_lock);
285
286 BUG_ON(!ref_obsolete(jeb->last_node));
287
288 /* Find the first node to be recovered, by skipping over every
289 node which ends before the wbuf starts, or which is obsolete. */
290 for (next = raw = jeb->first_node; next; raw = next) {
291 next = ref_next(raw);
292
293 if (ref_obsolete(raw) ||
294 (next && ref_offset(next) <= c->wbuf_ofs)) {
295 dbg_noderef("Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n",
296 ref_offset(raw), ref_flags(raw),
297 (ref_offset(raw) + ref_totlen(c, jeb, raw)),
298 c->wbuf_ofs);
299 continue;
300 }
301 dbg_noderef("First node to be recovered is at 0x%08x(%d)-0x%08x\n",
302 ref_offset(raw), ref_flags(raw),
303 (ref_offset(raw) + ref_totlen(c, jeb, raw)));
304
305 first_raw = raw;
306 break;
307 }
308
309 if (!first_raw) {
310 /* All nodes were obsolete. Nothing to recover. */
311 D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n"));
312 c->wbuf_len = 0;
313 return;
314 }
315
316 start = ref_offset(first_raw);
317 end = ref_offset(jeb->last_node);
318 nr_refile = 1;
319
320 /* Count the number of refs which need to be copied */
321 while ((raw = ref_next(raw)) != jeb->last_node)
322 nr_refile++;
323
324 dbg_noderef("wbuf recover %08x-%08x (%d bytes in %d nodes)\n",
325 start, end, end - start, nr_refile);
326
327 buf = NULL;
328 if (start < c->wbuf_ofs) {
329 /* First affected node was already partially written.
330 * Attempt to reread the old data into our buffer. */
331
332 buf = kmalloc(end - start, GFP_KERNEL);
333 if (!buf) {
334 printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n");
335
336 goto read_failed;
337 }
338
339 /* Do the read... */
340 ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf);
341
342 /* ECC recovered ? */
343 if ((ret == -EUCLEAN || ret == -EBADMSG) &&
344 (retlen == c->wbuf_ofs - start))
345 ret = 0;
346
347 if (ret || retlen != c->wbuf_ofs - start) {
348 printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n");
349
350 kfree(buf);
351 buf = NULL;
352 read_failed:
353 first_raw = ref_next(first_raw);
354 nr_refile--;
355 while (first_raw && ref_obsolete(first_raw)) {
356 first_raw = ref_next(first_raw);
357 nr_refile--;
358 }
359
360 /* If this was the only node to be recovered, give up */
361 if (!first_raw) {
362 c->wbuf_len = 0;
363 return;
364 }
365
366 /* It wasn't. Go on and try to recover nodes complete in the wbuf */
367 start = ref_offset(first_raw);
368 dbg_noderef("wbuf now recover %08x-%08x (%d bytes in %d nodes)\n",
369 start, end, end - start, nr_refile);
370
371 } else {
372 /* Read succeeded. Copy the remaining data from the wbuf */
373 memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs);
374 }
375 }
376 /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards.
377 Either 'buf' contains the data, or we find it in the wbuf */
378
379 /* ... and get an allocation of space from a shiny new block instead */
380 ret = jffs2_reserve_space_gc(c, end-start, &len, JFFS2_SUMMARY_NOSUM_SIZE);
381 if (ret) {
382 printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n");
383 kfree(buf);
384 return;
385 }
386
387 /* The summary is not recovered, so it must be disabled for this erase block */
388 jffs2_sum_disable_collecting(c->summary);
389
390 ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, nr_refile);
391 if (ret) {
392 printk(KERN_WARNING "Failed to allocate node refs for wbuf recovery. Data loss ensues.\n");
393 kfree(buf);
394 return;
395 }
396
397 ofs = write_ofs(c);
398
399 if (end-start >= c->wbuf_pagesize) {
400 /* Need to do another write immediately, but it's possible
401 that this is just because the wbuf itself is completely
402 full, and there's nothing earlier read back from the
403 flash. Hence 'buf' isn't necessarily what we're writing
404 from. */
405 unsigned char *rewrite_buf = buf?:c->wbuf;
406 uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize);
407
408 D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n",
409 towrite, ofs));
410
411 #ifdef BREAKMEHEADER
412 static int breakme;
413 if (breakme++ == 20) {
414 printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs);
415 breakme = 0;
416 c->mtd->write(c->mtd, ofs, towrite, &retlen,
417 brokenbuf);
418 ret = -EIO;
419 } else
420 #endif
421 ret = c->mtd->write(c->mtd, ofs, towrite, &retlen,
422 rewrite_buf);
423
424 if (ret || retlen != towrite || jffs2_verify_write(c, rewrite_buf, ofs)) {
425 /* Argh. We tried. Really we did. */
426 printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n");
427 kfree(buf);
428
429 if (retlen)
430 jffs2_add_physical_node_ref(c, ofs | REF_OBSOLETE, ref_totlen(c, jeb, first_raw), NULL);
431
432 return;
433 }
434 printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs);
435
436 c->wbuf_len = (end - start) - towrite;
437 c->wbuf_ofs = ofs + towrite;
438 memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len);
439 /* Don't muck about with c->wbuf_inodes. False positives are harmless. */
440 } else {
441 /* OK, now we're left with the dregs in whichever buffer we're using */
442 if (buf) {
443 memcpy(c->wbuf, buf, end-start);
444 } else {
445 memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start);
446 }
447 c->wbuf_ofs = ofs;
448 c->wbuf_len = end - start;
449 }
450
451 /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */
452 new_jeb = &c->blocks[ofs / c->sector_size];
453
454 spin_lock(&c->erase_completion_lock);
455 for (raw = first_raw; raw != jeb->last_node; raw = ref_next(raw)) {
456 uint32_t rawlen = ref_totlen(c, jeb, raw);
457 struct jffs2_inode_cache *ic;
458 struct jffs2_raw_node_ref *new_ref;
459 struct jffs2_raw_node_ref **adjust_ref = NULL;
460 struct jffs2_inode_info *f = NULL;
461
462 D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n",
463 rawlen, ref_offset(raw), ref_flags(raw), ofs));
464
465 ic = jffs2_raw_ref_to_ic(raw);
466
467 /* Ick. This XATTR mess should be fixed shortly... */
468 if (ic && ic->class == RAWNODE_CLASS_XATTR_DATUM) {
469 struct jffs2_xattr_datum *xd = (void *)ic;
470 BUG_ON(xd->node != raw);
471 adjust_ref = &xd->node;
472 raw->next_in_ino = NULL;
473 ic = NULL;
474 } else if (ic && ic->class == RAWNODE_CLASS_XATTR_REF) {
475 struct jffs2_xattr_datum *xr = (void *)ic;
476 BUG_ON(xr->node != raw);
477 adjust_ref = &xr->node;
478 raw->next_in_ino = NULL;
479 ic = NULL;
480 } else if (ic && ic->class == RAWNODE_CLASS_INODE_CACHE) {
481 struct jffs2_raw_node_ref **p = &ic->nodes;
482
483 /* Remove the old node from the per-inode list */
484 while (*p && *p != (void *)ic) {
485 if (*p == raw) {
486 (*p) = (raw->next_in_ino);
487 raw->next_in_ino = NULL;
488 break;
489 }
490 p = &((*p)->next_in_ino);
491 }
492
493 if (ic->state == INO_STATE_PRESENT && !ref_obsolete(raw)) {
494 /* If it's an in-core inode, then we have to adjust any
495 full_dirent or full_dnode structure to point to the
496 new version instead of the old */
497 f = jffs2_gc_fetch_inode(c, ic->ino, !ic->pino_nlink);
498 if (IS_ERR(f)) {
499 /* Should never happen; it _must_ be present */
500 JFFS2_ERROR("Failed to iget() ino #%u, err %ld\n",
501 ic->ino, PTR_ERR(f));
502 BUG();
503 }
504 /* We don't lock f->sem. There's a number of ways we could
505 end up in here with it already being locked, and nobody's
506 going to modify it on us anyway because we hold the
507 alloc_sem. We're only changing one ->raw pointer too,
508 which we can get away with without upsetting readers. */
509 adjust_ref = jffs2_incore_replace_raw(c, f, raw,
510 (void *)(buf?:c->wbuf) + (ref_offset(raw) - start));
511 } else if (unlikely(ic->state != INO_STATE_PRESENT &&
512 ic->state != INO_STATE_CHECKEDABSENT &&
513 ic->state != INO_STATE_GC)) {
514 JFFS2_ERROR("Inode #%u is in strange state %d!\n", ic->ino, ic->state);
515 BUG();
516 }
517 }
518
519 new_ref = jffs2_link_node_ref(c, new_jeb, ofs | ref_flags(raw), rawlen, ic);
520
521 if (adjust_ref) {
522 BUG_ON(*adjust_ref != raw);
523 *adjust_ref = new_ref;
524 }
525 if (f)
526 jffs2_gc_release_inode(c, f);
527
528 if (!ref_obsolete(raw)) {
529 jeb->dirty_size += rawlen;
530 jeb->used_size -= rawlen;
531 c->dirty_size += rawlen;
532 c->used_size -= rawlen;
533 raw->flash_offset = ref_offset(raw) | REF_OBSOLETE;
534 BUG_ON(raw->next_in_ino);
535 }
536 ofs += rawlen;
537 }
538
539 kfree(buf);
540
541 /* Fix up the original jeb now it's on the bad_list */
542 if (first_raw == jeb->first_node) {
543 D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset));
544 list_move(&jeb->list, &c->erase_pending_list);
545 c->nr_erasing_blocks++;
546 jffs2_erase_pending_trigger(c);
547 }
548
549 jffs2_dbg_acct_sanity_check_nolock(c, jeb);
550 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
551
552 jffs2_dbg_acct_sanity_check_nolock(c, new_jeb);
553 jffs2_dbg_acct_paranoia_check_nolock(c, new_jeb);
554
555 spin_unlock(&c->erase_completion_lock);
556
557 D1(printk(KERN_DEBUG "wbuf recovery completed OK. wbuf_ofs 0x%08x, len 0x%x\n", c->wbuf_ofs, c->wbuf_len));
558
559 }
560
561 /* Meaning of pad argument:
562 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway.
563 1: Pad, do not adjust nextblock free_size
564 2: Pad, adjust nextblock free_size
565 */
566 #define NOPAD 0
567 #define PAD_NOACCOUNT 1
568 #define PAD_ACCOUNTING 2
569
570 static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
571 {
572 struct jffs2_eraseblock *wbuf_jeb;
573 int ret;
574 size_t retlen;
575
576 /* Nothing to do if not write-buffering the flash. In particular, we shouldn't
577 del_timer() the timer we never initialised. */
578 if (!jffs2_is_writebuffered(c))
579 return 0;
580
581 if (mutex_trylock(&c->alloc_sem)) {
582 mutex_unlock(&c->alloc_sem);
583 printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n");
584 BUG();
585 }
586
587 if (!c->wbuf_len) /* already checked c->wbuf above */
588 return 0;
589
590 wbuf_jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
591 if (jffs2_prealloc_raw_node_refs(c, wbuf_jeb, c->nextblock->allocated_refs + 1))
592 return -ENOMEM;
593
594 /* claim remaining space on the page
595 this happens, if we have a change to a new block,
596 or if fsync forces us to flush the writebuffer.
597 if we have a switch to next page, we will not have
598 enough remaining space for this.
599 */
600 if (pad ) {
601 c->wbuf_len = PAD(c->wbuf_len);
602
603 /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR
604 with 8 byte page size */
605 memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len);
606
607 if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) {
608 struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len);
609 padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
610 padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING);
611 padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len);
612 padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4));
613 }
614 }
615 /* else jffs2_flash_writev has actually filled in the rest of the
616 buffer for us, and will deal with the node refs etc. later. */
617
618 #ifdef BREAKME
619 static int breakme;
620 if (breakme++ == 20) {
621 printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs);
622 breakme = 0;
623 c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen,
624 brokenbuf);
625 ret = -EIO;
626 } else
627 #endif
628
629 ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf);
630
631 if (ret) {
632 printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n", ret);
633 goto wfail;
634 } else if (retlen != c->wbuf_pagesize) {
635 printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n",
636 retlen, c->wbuf_pagesize);
637 ret = -EIO;
638 goto wfail;
639 } else if ((ret = jffs2_verify_write(c, c->wbuf, c->wbuf_ofs))) {
640 wfail:
641 jffs2_wbuf_recover(c);
642
643 return ret;
644 }
645
646 /* Adjust free size of the block if we padded. */
647 if (pad) {
648 uint32_t waste = c->wbuf_pagesize - c->wbuf_len;
649
650 D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n",
651 (wbuf_jeb==c->nextblock)?"next":"", wbuf_jeb->offset));
652
653 /* wbuf_pagesize - wbuf_len is the amount of space that's to be
654 padded. If there is less free space in the block than that,
655 something screwed up */
656 if (wbuf_jeb->free_size < waste) {
657 printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n",
658 c->wbuf_ofs, c->wbuf_len, waste);
659 printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n",
660 wbuf_jeb->offset, wbuf_jeb->free_size);
661 BUG();
662 }
663
664 spin_lock(&c->erase_completion_lock);
665
666 jffs2_link_node_ref(c, wbuf_jeb, (c->wbuf_ofs + c->wbuf_len) | REF_OBSOLETE, waste, NULL);
667 /* FIXME: that made it count as dirty. Convert to wasted */
668 wbuf_jeb->dirty_size -= waste;
669 c->dirty_size -= waste;
670 wbuf_jeb->wasted_size += waste;
671 c->wasted_size += waste;
672 } else
673 spin_lock(&c->erase_completion_lock);
674
675 /* Stick any now-obsoleted blocks on the erase_pending_list */
676 jffs2_refile_wbuf_blocks(c);
677 jffs2_clear_wbuf_ino_list(c);
678 spin_unlock(&c->erase_completion_lock);
679
680 memset(c->wbuf,0xff,c->wbuf_pagesize);
681 /* adjust write buffer offset, else we get a non contiguous write bug */
682 c->wbuf_ofs += c->wbuf_pagesize;
683 c->wbuf_len = 0;
684 return 0;
685 }
686
687 /* Trigger garbage collection to flush the write-buffer.
688 If ino arg is zero, do it if _any_ real (i.e. not GC) writes are
689 outstanding. If ino arg non-zero, do it only if a write for the
690 given inode is outstanding. */
691 int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino)
692 {
693 uint32_t old_wbuf_ofs;
694 uint32_t old_wbuf_len;
695 int ret = 0;
696
697 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino));
698
699 if (!c->wbuf)
700 return 0;
701
702 mutex_lock(&c->alloc_sem);
703 if (!jffs2_wbuf_pending_for_ino(c, ino)) {
704 D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino));
705 mutex_unlock(&c->alloc_sem);
706 return 0;
707 }
708
709 old_wbuf_ofs = c->wbuf_ofs;
710 old_wbuf_len = c->wbuf_len;
711
712 if (c->unchecked_size) {
713 /* GC won't make any progress for a while */
714 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n"));
715 down_write(&c->wbuf_sem);
716 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
717 /* retry flushing wbuf in case jffs2_wbuf_recover
718 left some data in the wbuf */
719 if (ret)
720 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
721 up_write(&c->wbuf_sem);
722 } else while (old_wbuf_len &&
723 old_wbuf_ofs == c->wbuf_ofs) {
724
725 mutex_unlock(&c->alloc_sem);
726
727 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n"));
728
729 ret = jffs2_garbage_collect_pass(c);
730 if (ret) {
731 /* GC failed. Flush it with padding instead */
732 mutex_lock(&c->alloc_sem);
733 down_write(&c->wbuf_sem);
734 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
735 /* retry flushing wbuf in case jffs2_wbuf_recover
736 left some data in the wbuf */
737 if (ret)
738 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
739 up_write(&c->wbuf_sem);
740 break;
741 }
742 mutex_lock(&c->alloc_sem);
743 }
744
745 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n"));
746
747 mutex_unlock(&c->alloc_sem);
748 return ret;
749 }
750
751 /* Pad write-buffer to end and write it, wasting space. */
752 int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
753 {
754 int ret;
755
756 if (!c->wbuf)
757 return 0;
758
759 down_write(&c->wbuf_sem);
760 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
761 /* retry - maybe wbuf recover left some data in wbuf. */
762 if (ret)
763 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
764 up_write(&c->wbuf_sem);
765
766 return ret;
767 }
768
769 static size_t jffs2_fill_wbuf(struct jffs2_sb_info *c, const uint8_t *buf,
770 size_t len)
771 {
772 if (len && !c->wbuf_len && (len >= c->wbuf_pagesize))
773 return 0;
774
775 if (len > (c->wbuf_pagesize - c->wbuf_len))
776 len = c->wbuf_pagesize - c->wbuf_len;
777 memcpy(c->wbuf + c->wbuf_len, buf, len);
778 c->wbuf_len += (uint32_t) len;
779 return len;
780 }
781
782 int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs,
783 unsigned long count, loff_t to, size_t *retlen,
784 uint32_t ino)
785 {
786 struct jffs2_eraseblock *jeb;
787 size_t wbuf_retlen, donelen = 0;
788 uint32_t outvec_to = to;
789 int ret, invec;
790
791 /* If not writebuffered flash, don't bother */
792 if (!jffs2_is_writebuffered(c))
793 return jffs2_flash_direct_writev(c, invecs, count, to, retlen);
794
795 down_write(&c->wbuf_sem);
796
797 /* If wbuf_ofs is not initialized, set it to target address */
798 if (c->wbuf_ofs == 0xFFFFFFFF) {
799 c->wbuf_ofs = PAGE_DIV(to);
800 c->wbuf_len = PAGE_MOD(to);
801 memset(c->wbuf,0xff,c->wbuf_pagesize);
802 }
803
804 /*
805 * Sanity checks on target address. It's permitted to write
806 * at PAD(c->wbuf_len+c->wbuf_ofs), and it's permitted to
807 * write at the beginning of a new erase block. Anything else,
808 * and you die. New block starts at xxx000c (0-b = block
809 * header)
810 */
811 if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) {
812 /* It's a write to a new block */
813 if (c->wbuf_len) {
814 D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx "
815 "causes flush of wbuf at 0x%08x\n",
816 (unsigned long)to, c->wbuf_ofs));
817 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
818 if (ret)
819 goto outerr;
820 }
821 /* set pointer to new block */
822 c->wbuf_ofs = PAGE_DIV(to);
823 c->wbuf_len = PAGE_MOD(to);
824 }
825
826 if (to != PAD(c->wbuf_ofs + c->wbuf_len)) {
827 /* We're not writing immediately after the writebuffer. Bad. */
828 printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write "
829 "to %08lx\n", (unsigned long)to);
830 if (c->wbuf_len)
831 printk(KERN_CRIT "wbuf was previously %08x-%08x\n",
832 c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len);
833 BUG();
834 }
835
836 /* adjust alignment offset */
837 if (c->wbuf_len != PAGE_MOD(to)) {
838 c->wbuf_len = PAGE_MOD(to);
839 /* take care of alignment to next page */
840 if (!c->wbuf_len) {
841 c->wbuf_len = c->wbuf_pagesize;
842 ret = __jffs2_flush_wbuf(c, NOPAD);
843 if (ret)
844 goto outerr;
845 }
846 }
847
848 for (invec = 0; invec < count; invec++) {
849 int vlen = invecs[invec].iov_len;
850 uint8_t *v = invecs[invec].iov_base;
851
852 wbuf_retlen = jffs2_fill_wbuf(c, v, vlen);
853
854 if (c->wbuf_len == c->wbuf_pagesize) {
855 ret = __jffs2_flush_wbuf(c, NOPAD);
856 if (ret)
857 goto outerr;
858 }
859 vlen -= wbuf_retlen;
860 outvec_to += wbuf_retlen;
861 donelen += wbuf_retlen;
862 v += wbuf_retlen;
863
864 if (vlen >= c->wbuf_pagesize) {
865 ret = c->mtd->write(c->mtd, outvec_to, PAGE_DIV(vlen),
866 &wbuf_retlen, v);
867 if (ret < 0 || wbuf_retlen != PAGE_DIV(vlen))
868 goto outfile;
869
870 vlen -= wbuf_retlen;
871 outvec_to += wbuf_retlen;
872 c->wbuf_ofs = outvec_to;
873 donelen += wbuf_retlen;
874 v += wbuf_retlen;
875 }
876
877 wbuf_retlen = jffs2_fill_wbuf(c, v, vlen);
878 if (c->wbuf_len == c->wbuf_pagesize) {
879 ret = __jffs2_flush_wbuf(c, NOPAD);
880 if (ret)
881 goto outerr;
882 }
883
884 outvec_to += wbuf_retlen;
885 donelen += wbuf_retlen;
886 }
887
888 /*
889 * If there's a remainder in the wbuf and it's a non-GC write,
890 * remember that the wbuf affects this ino
891 */
892 *retlen = donelen;
893
894 if (jffs2_sum_active()) {
895 int res = jffs2_sum_add_kvec(c, invecs, count, (uint32_t) to);
896 if (res)
897 return res;
898 }
899
900 if (c->wbuf_len && ino)
901 jffs2_wbuf_dirties_inode(c, ino);
902
903 ret = 0;
904 up_write(&c->wbuf_sem);
905 return ret;
906
907 outfile:
908 /*
909 * At this point we have no problem, c->wbuf is empty. However
910 * refile nextblock to avoid writing again to same address.
911 */
912
913 spin_lock(&c->erase_completion_lock);
914
915 jeb = &c->blocks[outvec_to / c->sector_size];
916 jffs2_block_refile(c, jeb, REFILE_ANYWAY);
917
918 spin_unlock(&c->erase_completion_lock);
919
920 outerr:
921 *retlen = 0;
922 up_write(&c->wbuf_sem);
923 return ret;
924 }
925
926 /*
927 * This is the entry for flash write.
928 * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev
929 */
930 int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
931 size_t *retlen, const u_char *buf)
932 {
933 struct kvec vecs[1];
934
935 if (!jffs2_is_writebuffered(c))
936 return jffs2_flash_direct_write(c, ofs, len, retlen, buf);
937
938 vecs[0].iov_base = (unsigned char *) buf;
939 vecs[0].iov_len = len;
940 return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0);
941 }
942
943 /*
944 Handle readback from writebuffer and ECC failure return
945 */
946 int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf)
947 {
948 loff_t orbf = 0, owbf = 0, lwbf = 0;
949 int ret;
950
951 if (!jffs2_is_writebuffered(c))
952 return c->mtd->read(c->mtd, ofs, len, retlen, buf);
953
954 /* Read flash */
955 down_read(&c->wbuf_sem);
956 ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);
957
958 if ( (ret == -EBADMSG || ret == -EUCLEAN) && (*retlen == len) ) {
959 if (ret == -EBADMSG)
960 printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx)"
961 " returned ECC error\n", len, ofs);
962 /*
963 * We have the raw data without ECC correction in the buffer,
964 * maybe we are lucky and all data or parts are correct. We
965 * check the node. If data are corrupted node check will sort
966 * it out. We keep this block, it will fail on write or erase
967 * and the we mark it bad. Or should we do that now? But we
968 * should give him a chance. Maybe we had a system crash or
969 * power loss before the ecc write or a erase was completed.
970 * So we return success. :)
971 */
972 ret = 0;
973 }
974
975 /* if no writebuffer available or write buffer empty, return */
976 if (!c->wbuf_pagesize || !c->wbuf_len)
977 goto exit;
978
979 /* if we read in a different block, return */
980 if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs))
981 goto exit;
982
983 if (ofs >= c->wbuf_ofs) {
984 owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */
985 if (owbf > c->wbuf_len) /* is read beyond write buffer ? */
986 goto exit;
987 lwbf = c->wbuf_len - owbf; /* number of bytes to copy */
988 if (lwbf > len)
989 lwbf = len;
990 } else {
991 orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */
992 if (orbf > len) /* is write beyond write buffer ? */
993 goto exit;
994 lwbf = len - orbf; /* number of bytes to copy */
995 if (lwbf > c->wbuf_len)
996 lwbf = c->wbuf_len;
997 }
998 if (lwbf > 0)
999 memcpy(buf+orbf,c->wbuf+owbf,lwbf);
1000
1001 exit:
1002 up_read(&c->wbuf_sem);
1003 return ret;
1004 }
1005
1006 #define NR_OOB_SCAN_PAGES 4
1007
1008 /* For historical reasons we use only 8 bytes for OOB clean marker */
1009 #define OOB_CM_SIZE 8
1010
1011 static const struct jffs2_unknown_node oob_cleanmarker =
1012 {
1013 .magic = constant_cpu_to_je16(JFFS2_MAGIC_BITMASK),
1014 .nodetype = constant_cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
1015 .totlen = constant_cpu_to_je32(8)
1016 };
1017
1018 /*
1019 * Check, if the out of band area is empty. This function knows about the clean
1020 * marker and if it is present in OOB, treats the OOB as empty anyway.
1021 */
1022 int jffs2_check_oob_empty(struct jffs2_sb_info *c,
1023 struct jffs2_eraseblock *jeb, int mode)
1024 {
1025 int i, ret;
1026 int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
1027 struct mtd_oob_ops ops;
1028
1029 ops.mode = MTD_OOB_AUTO;
1030 ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail;
1031 ops.oobbuf = c->oobbuf;
1032 ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
1033 ops.datbuf = NULL;
1034
1035 ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops);
1036 if (ret || ops.oobretlen != ops.ooblen) {
1037 printk(KERN_ERR "cannot read OOB for EB at %08x, requested %zd"
1038 " bytes, read %zd bytes, error %d\n",
1039 jeb->offset, ops.ooblen, ops.oobretlen, ret);
1040 if (!ret)
1041 ret = -EIO;
1042 return ret;
1043 }
1044
1045 for(i = 0; i < ops.ooblen; i++) {
1046 if (mode && i < cmlen)
1047 /* Yeah, we know about the cleanmarker */
1048 continue;
1049
1050 if (ops.oobbuf[i] != 0xFF) {
1051 D2(printk(KERN_DEBUG "Found %02x at %x in OOB for "
1052 "%08x\n", ops.oobbuf[i], i, jeb->offset));
1053 return 1;
1054 }
1055 }
1056
1057 return 0;
1058 }
1059
1060 /*
1061 * Check for a valid cleanmarker.
1062 * Returns: 0 if a valid cleanmarker was found
1063 * 1 if no cleanmarker was found
1064 * negative error code if an error occurred
1065 */
1066 int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c,
1067 struct jffs2_eraseblock *jeb)
1068 {
1069 struct mtd_oob_ops ops;
1070 int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
1071
1072 ops.mode = MTD_OOB_AUTO;
1073 ops.ooblen = cmlen;
1074 ops.oobbuf = c->oobbuf;
1075 ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
1076 ops.datbuf = NULL;
1077
1078 ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops);
1079 if (ret || ops.oobretlen != ops.ooblen) {
1080 printk(KERN_ERR "cannot read OOB for EB at %08x, requested %zd"
1081 " bytes, read %zd bytes, error %d\n",
1082 jeb->offset, ops.ooblen, ops.oobretlen, ret);
1083 if (!ret)
1084 ret = -EIO;
1085 return ret;
1086 }
1087
1088 return !!memcmp(&oob_cleanmarker, c->oobbuf, cmlen);
1089 }
1090
1091 int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c,
1092 struct jffs2_eraseblock *jeb)
1093 {
1094 int ret;
1095 struct mtd_oob_ops ops;
1096 int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
1097
1098 ops.mode = MTD_OOB_AUTO;
1099 ops.ooblen = cmlen;
1100 ops.oobbuf = (uint8_t *)&oob_cleanmarker;
1101 ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
1102 ops.datbuf = NULL;
1103
1104 ret = c->mtd->write_oob(c->mtd, jeb->offset, &ops);
1105 if (ret || ops.oobretlen != ops.ooblen) {
1106 printk(KERN_ERR "cannot write OOB for EB at %08x, requested %zd"
1107 " bytes, read %zd bytes, error %d\n",
1108 jeb->offset, ops.ooblen, ops.oobretlen, ret);
1109 if (!ret)
1110 ret = -EIO;
1111 return ret;
1112 }
1113
1114 return 0;
1115 }
1116
1117 /*
1118 * On NAND we try to mark this block bad. If the block was erased more
1119 * than MAX_ERASE_FAILURES we mark it finaly bad.
1120 * Don't care about failures. This block remains on the erase-pending
1121 * or badblock list as long as nobody manipulates the flash with
1122 * a bootloader or something like that.
1123 */
1124
1125 int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
1126 {
1127 int ret;
1128
1129 /* if the count is < max, we try to write the counter to the 2nd page oob area */
1130 if( ++jeb->bad_count < MAX_ERASE_FAILURES)
1131 return 0;
1132
1133 if (!c->mtd->block_markbad)
1134 return 1; // What else can we do?
1135
1136 printk(KERN_WARNING "JFFS2: marking eraseblock at %08x\n as bad", bad_offset);
1137 ret = c->mtd->block_markbad(c->mtd, bad_offset);
1138
1139 if (ret) {
1140 D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
1141 return ret;
1142 }
1143 return 1;
1144 }
1145
1146 int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
1147 {
1148 struct nand_ecclayout *oinfo = c->mtd->ecclayout;
1149
1150 if (!c->mtd->oobsize)
1151 return 0;
1152
1153 /* Cleanmarker is out-of-band, so inline size zero */
1154 c->cleanmarker_size = 0;
1155
1156 if (!oinfo || oinfo->oobavail == 0) {
1157 printk(KERN_ERR "inconsistent device description\n");
1158 return -EINVAL;
1159 }
1160
1161 D1(printk(KERN_DEBUG "JFFS2 using OOB on NAND\n"));
1162
1163 c->oobavail = oinfo->oobavail;
1164
1165 /* Initialise write buffer */
1166 init_rwsem(&c->wbuf_sem);
1167 c->wbuf_pagesize = c->mtd->writesize;
1168 c->wbuf_ofs = 0xFFFFFFFF;
1169
1170 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1171 if (!c->wbuf)
1172 return -ENOMEM;
1173
1174 c->oobbuf = kmalloc(NR_OOB_SCAN_PAGES * c->oobavail, GFP_KERNEL);
1175 if (!c->oobbuf) {
1176 kfree(c->wbuf);
1177 return -ENOMEM;
1178 }
1179
1180 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
1181 c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1182 if (!c->wbuf_verify) {
1183 kfree(c->oobbuf);
1184 kfree(c->wbuf);
1185 return -ENOMEM;
1186 }
1187 #endif
1188 return 0;
1189 }
1190
1191 void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
1192 {
1193 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
1194 kfree(c->wbuf_verify);
1195 #endif
1196 kfree(c->wbuf);
1197 kfree(c->oobbuf);
1198 }
1199
1200 int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
1201 c->cleanmarker_size = 0; /* No cleanmarkers needed */
1202
1203 /* Initialize write buffer */
1204 init_rwsem(&c->wbuf_sem);
1205
1206
1207 c->wbuf_pagesize = c->mtd->erasesize;
1208
1209 /* Find a suitable c->sector_size
1210 * - Not too much sectors
1211 * - Sectors have to be at least 4 K + some bytes
1212 * - All known dataflashes have erase sizes of 528 or 1056
1213 * - we take at least 8 eraseblocks and want to have at least 8K size
1214 * - The concatenation should be a power of 2
1215 */
1216
1217 c->sector_size = 8 * c->mtd->erasesize;
1218
1219 while (c->sector_size < 8192) {
1220 c->sector_size *= 2;
1221 }
1222
1223 /* It may be necessary to adjust the flash size */
1224 c->flash_size = c->mtd->size;
1225
1226 if ((c->flash_size % c->sector_size) != 0) {
1227 c->flash_size = (c->flash_size / c->sector_size) * c->sector_size;
1228 printk(KERN_WARNING "JFFS2 flash size adjusted to %dKiB\n", c->flash_size);
1229 };
1230
1231 c->wbuf_ofs = 0xFFFFFFFF;
1232 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1233 if (!c->wbuf)
1234 return -ENOMEM;
1235
1236 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
1237 c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1238 if (!c->wbuf_verify) {
1239 kfree(c->oobbuf);
1240 kfree(c->wbuf);
1241 return -ENOMEM;
1242 }
1243 #endif
1244
1245 printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size);
1246
1247 return 0;
1248 }
1249
1250 void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
1251 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
1252 kfree(c->wbuf_verify);
1253 #endif
1254 kfree(c->wbuf);
1255 }
1256
1257 int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
1258 /* Cleanmarker currently occupies whole programming regions,
1259 * either one or 2 for 8Byte STMicro flashes. */
1260 c->cleanmarker_size = max(16u, c->mtd->writesize);
1261
1262 /* Initialize write buffer */
1263 init_rwsem(&c->wbuf_sem);
1264 c->wbuf_pagesize = c->mtd->writesize;
1265 c->wbuf_ofs = 0xFFFFFFFF;
1266
1267 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1268 if (!c->wbuf)
1269 return -ENOMEM;
1270
1271 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
1272 c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1273 if (!c->wbuf_verify) {
1274 kfree(c->wbuf);
1275 return -ENOMEM;
1276 }
1277 #endif
1278 return 0;
1279 }
1280
1281 void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {
1282 #ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
1283 kfree(c->wbuf_verify);
1284 #endif
1285 kfree(c->wbuf);
1286 }
1287
1288 int jffs2_ubivol_setup(struct jffs2_sb_info *c) {
1289 c->cleanmarker_size = 0;
1290
1291 if (c->mtd->writesize == 1)
1292 /* We do not need write-buffer */
1293 return 0;
1294
1295 init_rwsem(&c->wbuf_sem);
1296
1297 c->wbuf_pagesize = c->mtd->writesize;
1298 c->wbuf_ofs = 0xFFFFFFFF;
1299 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1300 if (!c->wbuf)
1301 return -ENOMEM;
1302
1303 printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size);
1304
1305 return 0;
1306 }
1307
1308 void jffs2_ubivol_cleanup(struct jffs2_sb_info *c) {
1309 kfree(c->wbuf);
1310 }
1311
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