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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * Copyright (C) 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 | * | |
894214d1 | 12 | * $Id: wbuf.c,v 1.92 2005/04/05 12:51:54 dedekind Exp $ |
1da177e4 LT |
13 | * |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/mtd/mtd.h> | |
19 | #include <linux/crc32.h> | |
20 | #include <linux/mtd/nand.h> | |
21 | #include "nodelist.h" | |
22 | ||
23 | /* For testing write failures */ | |
24 | #undef BREAKME | |
25 | #undef BREAKMEHEADER | |
26 | ||
27 | #ifdef BREAKME | |
28 | static unsigned char *brokenbuf; | |
29 | #endif | |
30 | ||
31 | /* max. erase failures before we mark a block bad */ | |
32 | #define MAX_ERASE_FAILURES 2 | |
33 | ||
34 | /* two seconds timeout for timed wbuf-flushing */ | |
35 | #define WBUF_FLUSH_TIMEOUT 2 * HZ | |
36 | ||
37 | struct jffs2_inodirty { | |
38 | uint32_t ino; | |
39 | struct jffs2_inodirty *next; | |
40 | }; | |
41 | ||
42 | static struct jffs2_inodirty inodirty_nomem; | |
43 | ||
44 | static int jffs2_wbuf_pending_for_ino(struct jffs2_sb_info *c, uint32_t ino) | |
45 | { | |
46 | struct jffs2_inodirty *this = c->wbuf_inodes; | |
47 | ||
48 | /* If a malloc failed, consider _everything_ dirty */ | |
49 | if (this == &inodirty_nomem) | |
50 | return 1; | |
51 | ||
52 | /* If ino == 0, _any_ non-GC writes mean 'yes' */ | |
53 | if (this && !ino) | |
54 | return 1; | |
55 | ||
56 | /* Look to see if the inode in question is pending in the wbuf */ | |
57 | while (this) { | |
58 | if (this->ino == ino) | |
59 | return 1; | |
60 | this = this->next; | |
61 | } | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static void jffs2_clear_wbuf_ino_list(struct jffs2_sb_info *c) | |
66 | { | |
67 | struct jffs2_inodirty *this; | |
68 | ||
69 | this = c->wbuf_inodes; | |
70 | ||
71 | if (this != &inodirty_nomem) { | |
72 | while (this) { | |
73 | struct jffs2_inodirty *next = this->next; | |
74 | kfree(this); | |
75 | this = next; | |
76 | } | |
77 | } | |
78 | c->wbuf_inodes = NULL; | |
79 | } | |
80 | ||
81 | static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino) | |
82 | { | |
83 | struct jffs2_inodirty *new; | |
84 | ||
85 | /* Mark the superblock dirty so that kupdated will flush... */ | |
4d952709 | 86 | jffs2_erase_pending_trigger(c); |
1da177e4 LT |
87 | |
88 | if (jffs2_wbuf_pending_for_ino(c, ino)) | |
89 | return; | |
90 | ||
91 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
92 | if (!new) { | |
93 | D1(printk(KERN_DEBUG "No memory to allocate inodirty. Fallback to all considered dirty\n")); | |
94 | jffs2_clear_wbuf_ino_list(c); | |
95 | c->wbuf_inodes = &inodirty_nomem; | |
96 | return; | |
97 | } | |
98 | new->ino = ino; | |
99 | new->next = c->wbuf_inodes; | |
100 | c->wbuf_inodes = new; | |
101 | return; | |
102 | } | |
103 | ||
104 | static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c) | |
105 | { | |
106 | struct list_head *this, *next; | |
107 | static int n; | |
108 | ||
109 | if (list_empty(&c->erasable_pending_wbuf_list)) | |
110 | return; | |
111 | ||
112 | list_for_each_safe(this, next, &c->erasable_pending_wbuf_list) { | |
113 | struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list); | |
114 | ||
115 | D1(printk(KERN_DEBUG "Removing eraseblock at 0x%08x from erasable_pending_wbuf_list...\n", jeb->offset)); | |
116 | list_del(this); | |
117 | if ((jiffies + (n++)) & 127) { | |
118 | /* Most of the time, we just erase it immediately. Otherwise we | |
119 | spend ages scanning it on mount, etc. */ | |
120 | D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n")); | |
121 | list_add_tail(&jeb->list, &c->erase_pending_list); | |
122 | c->nr_erasing_blocks++; | |
123 | jffs2_erase_pending_trigger(c); | |
124 | } else { | |
125 | /* Sometimes, however, we leave it elsewhere so it doesn't get | |
126 | immediately reused, and we spread the load a bit. */ | |
127 | D1(printk(KERN_DEBUG "...and adding to erasable_list\n")); | |
128 | list_add_tail(&jeb->list, &c->erasable_list); | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
7f716cf3 EH |
133 | #define REFILE_NOTEMPTY 0 |
134 | #define REFILE_ANYWAY 1 | |
135 | ||
136 | static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int allow_empty) | |
1da177e4 LT |
137 | { |
138 | D1(printk("About to refile bad block at %08x\n", jeb->offset)); | |
139 | ||
140 | D2(jffs2_dump_block_lists(c)); | |
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 { | |
9b88f473 | 150 | BUG_ON(allow_empty == REFILE_NOTEMPTY); |
1da177e4 LT |
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 | D2(jffs2_dump_block_lists(c)); | |
158 | ||
159 | /* Adjust its size counts accordingly */ | |
160 | c->wasted_size += jeb->free_size; | |
161 | c->free_size -= jeb->free_size; | |
162 | jeb->wasted_size += jeb->free_size; | |
163 | jeb->free_size = 0; | |
164 | ||
165 | ACCT_SANITY_CHECK(c,jeb); | |
166 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
167 | } | |
168 | ||
169 | /* Recover from failure to write wbuf. Recover the nodes up to the | |
170 | * wbuf, not the one which we were starting to try to write. */ | |
171 | ||
172 | static void jffs2_wbuf_recover(struct jffs2_sb_info *c) | |
173 | { | |
174 | struct jffs2_eraseblock *jeb, *new_jeb; | |
175 | struct jffs2_raw_node_ref **first_raw, **raw; | |
176 | size_t retlen; | |
177 | int ret; | |
178 | unsigned char *buf; | |
179 | uint32_t start, end, ofs, len; | |
180 | ||
181 | spin_lock(&c->erase_completion_lock); | |
182 | ||
183 | jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; | |
184 | ||
7f716cf3 | 185 | jffs2_block_refile(c, jeb, REFILE_NOTEMPTY); |
1da177e4 LT |
186 | |
187 | /* Find the first node to be recovered, by skipping over every | |
188 | node which ends before the wbuf starts, or which is obsolete. */ | |
189 | first_raw = &jeb->first_node; | |
190 | while (*first_raw && | |
191 | (ref_obsolete(*first_raw) || | |
192 | (ref_offset(*first_raw)+ref_totlen(c, jeb, *first_raw)) < c->wbuf_ofs)) { | |
193 | D1(printk(KERN_DEBUG "Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n", | |
194 | ref_offset(*first_raw), ref_flags(*first_raw), | |
195 | (ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw)), | |
196 | c->wbuf_ofs)); | |
197 | first_raw = &(*first_raw)->next_phys; | |
198 | } | |
199 | ||
200 | if (!*first_raw) { | |
201 | /* All nodes were obsolete. Nothing to recover. */ | |
202 | D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n")); | |
203 | spin_unlock(&c->erase_completion_lock); | |
204 | return; | |
205 | } | |
206 | ||
207 | start = ref_offset(*first_raw); | |
208 | end = ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw); | |
209 | ||
210 | /* Find the last node to be recovered */ | |
211 | raw = first_raw; | |
212 | while ((*raw)) { | |
213 | if (!ref_obsolete(*raw)) | |
214 | end = ref_offset(*raw) + ref_totlen(c, jeb, *raw); | |
215 | ||
216 | raw = &(*raw)->next_phys; | |
217 | } | |
218 | spin_unlock(&c->erase_completion_lock); | |
219 | ||
220 | D1(printk(KERN_DEBUG "wbuf recover %08x-%08x\n", start, end)); | |
221 | ||
222 | buf = NULL; | |
223 | if (start < c->wbuf_ofs) { | |
224 | /* First affected node was already partially written. | |
225 | * Attempt to reread the old data into our buffer. */ | |
226 | ||
227 | buf = kmalloc(end - start, GFP_KERNEL); | |
228 | if (!buf) { | |
229 | printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n"); | |
230 | ||
231 | goto read_failed; | |
232 | } | |
233 | ||
234 | /* Do the read... */ | |
235 | if (jffs2_cleanmarker_oob(c)) | |
236 | ret = c->mtd->read_ecc(c->mtd, start, c->wbuf_ofs - start, &retlen, buf, NULL, c->oobinfo); | |
237 | else | |
238 | ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf); | |
239 | ||
240 | if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) { | |
241 | /* ECC recovered */ | |
242 | ret = 0; | |
243 | } | |
244 | if (ret || retlen != c->wbuf_ofs - start) { | |
245 | printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n"); | |
246 | ||
247 | kfree(buf); | |
248 | buf = NULL; | |
249 | read_failed: | |
250 | first_raw = &(*first_raw)->next_phys; | |
251 | /* If this was the only node to be recovered, give up */ | |
252 | if (!(*first_raw)) | |
253 | return; | |
254 | ||
255 | /* It wasn't. Go on and try to recover nodes complete in the wbuf */ | |
256 | start = ref_offset(*first_raw); | |
257 | } else { | |
258 | /* Read succeeded. Copy the remaining data from the wbuf */ | |
259 | memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs); | |
260 | } | |
261 | } | |
262 | /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards. | |
263 | Either 'buf' contains the data, or we find it in the wbuf */ | |
264 | ||
265 | ||
266 | /* ... and get an allocation of space from a shiny new block instead */ | |
267 | ret = jffs2_reserve_space_gc(c, end-start, &ofs, &len); | |
268 | if (ret) { | |
269 | printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n"); | |
9b88f473 | 270 | kfree(buf); |
1da177e4 LT |
271 | return; |
272 | } | |
273 | if (end-start >= c->wbuf_pagesize) { | |
7f716cf3 | 274 | /* Need to do another write immediately, but it's possible |
9b88f473 EH |
275 | that this is just because the wbuf itself is completely |
276 | full, and there's nothing earlier read back from the | |
277 | flash. Hence 'buf' isn't necessarily what we're writing | |
278 | from. */ | |
7f716cf3 | 279 | unsigned char *rewrite_buf = buf?:c->wbuf; |
1da177e4 LT |
280 | uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize); |
281 | ||
282 | D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n", | |
283 | towrite, ofs)); | |
284 | ||
285 | #ifdef BREAKMEHEADER | |
286 | static int breakme; | |
287 | if (breakme++ == 20) { | |
288 | printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs); | |
289 | breakme = 0; | |
290 | c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen, | |
291 | brokenbuf, NULL, c->oobinfo); | |
292 | ret = -EIO; | |
293 | } else | |
294 | #endif | |
295 | if (jffs2_cleanmarker_oob(c)) | |
296 | ret = c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen, | |
7f716cf3 | 297 | rewrite_buf, NULL, c->oobinfo); |
1da177e4 | 298 | else |
7f716cf3 | 299 | ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, rewrite_buf); |
1da177e4 LT |
300 | |
301 | if (ret || retlen != towrite) { | |
302 | /* Argh. We tried. Really we did. */ | |
303 | printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n"); | |
9b88f473 | 304 | kfree(buf); |
1da177e4 LT |
305 | |
306 | if (retlen) { | |
307 | struct jffs2_raw_node_ref *raw2; | |
308 | ||
309 | raw2 = jffs2_alloc_raw_node_ref(); | |
310 | if (!raw2) | |
311 | return; | |
312 | ||
313 | raw2->flash_offset = ofs | REF_OBSOLETE; | |
314 | raw2->__totlen = ref_totlen(c, jeb, *first_raw); | |
315 | raw2->next_phys = NULL; | |
316 | raw2->next_in_ino = NULL; | |
317 | ||
318 | jffs2_add_physical_node_ref(c, raw2); | |
319 | } | |
320 | return; | |
321 | } | |
322 | printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs); | |
323 | ||
324 | c->wbuf_len = (end - start) - towrite; | |
325 | c->wbuf_ofs = ofs + towrite; | |
7f716cf3 | 326 | memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len); |
1da177e4 | 327 | /* Don't muck about with c->wbuf_inodes. False positives are harmless. */ |
7f716cf3 EH |
328 | if (buf) |
329 | kfree(buf); | |
1da177e4 LT |
330 | } else { |
331 | /* OK, now we're left with the dregs in whichever buffer we're using */ | |
332 | if (buf) { | |
333 | memcpy(c->wbuf, buf, end-start); | |
334 | kfree(buf); | |
335 | } else { | |
336 | memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start); | |
337 | } | |
338 | c->wbuf_ofs = ofs; | |
339 | c->wbuf_len = end - start; | |
340 | } | |
341 | ||
342 | /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */ | |
343 | new_jeb = &c->blocks[ofs / c->sector_size]; | |
344 | ||
345 | spin_lock(&c->erase_completion_lock); | |
346 | if (new_jeb->first_node) { | |
347 | /* Odd, but possible with ST flash later maybe */ | |
348 | new_jeb->last_node->next_phys = *first_raw; | |
349 | } else { | |
350 | new_jeb->first_node = *first_raw; | |
351 | } | |
352 | ||
353 | raw = first_raw; | |
354 | while (*raw) { | |
355 | uint32_t rawlen = ref_totlen(c, jeb, *raw); | |
356 | ||
357 | D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n", | |
358 | rawlen, ref_offset(*raw), ref_flags(*raw), ofs)); | |
359 | ||
360 | if (ref_obsolete(*raw)) { | |
361 | /* Shouldn't really happen much */ | |
362 | new_jeb->dirty_size += rawlen; | |
363 | new_jeb->free_size -= rawlen; | |
364 | c->dirty_size += rawlen; | |
365 | } else { | |
366 | new_jeb->used_size += rawlen; | |
367 | new_jeb->free_size -= rawlen; | |
368 | jeb->dirty_size += rawlen; | |
369 | jeb->used_size -= rawlen; | |
370 | c->dirty_size += rawlen; | |
371 | } | |
372 | c->free_size -= rawlen; | |
373 | (*raw)->flash_offset = ofs | ref_flags(*raw); | |
374 | ofs += rawlen; | |
375 | new_jeb->last_node = *raw; | |
376 | ||
377 | raw = &(*raw)->next_phys; | |
378 | } | |
379 | ||
380 | /* Fix up the original jeb now it's on the bad_list */ | |
381 | *first_raw = NULL; | |
382 | if (first_raw == &jeb->first_node) { | |
383 | jeb->last_node = NULL; | |
384 | D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset)); | |
385 | list_del(&jeb->list); | |
386 | list_add(&jeb->list, &c->erase_pending_list); | |
387 | c->nr_erasing_blocks++; | |
388 | jffs2_erase_pending_trigger(c); | |
389 | } | |
390 | else | |
391 | jeb->last_node = container_of(first_raw, struct jffs2_raw_node_ref, next_phys); | |
392 | ||
393 | ACCT_SANITY_CHECK(c,jeb); | |
394 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
395 | ||
396 | ACCT_SANITY_CHECK(c,new_jeb); | |
397 | D1(ACCT_PARANOIA_CHECK(new_jeb)); | |
398 | ||
399 | spin_unlock(&c->erase_completion_lock); | |
400 | ||
401 | D1(printk(KERN_DEBUG "wbuf recovery completed OK\n")); | |
402 | } | |
403 | ||
404 | /* Meaning of pad argument: | |
405 | 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway. | |
406 | 1: Pad, do not adjust nextblock free_size | |
407 | 2: Pad, adjust nextblock free_size | |
408 | */ | |
409 | #define NOPAD 0 | |
410 | #define PAD_NOACCOUNT 1 | |
411 | #define PAD_ACCOUNTING 2 | |
412 | ||
413 | static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad) | |
414 | { | |
415 | int ret; | |
416 | size_t retlen; | |
417 | ||
3be36675 | 418 | /* Nothing to do if not write-buffering the flash. In particular, we shouldn't |
1da177e4 | 419 | del_timer() the timer we never initialised. */ |
3be36675 | 420 | if (!jffs2_is_writebuffered(c)) |
1da177e4 LT |
421 | return 0; |
422 | ||
423 | if (!down_trylock(&c->alloc_sem)) { | |
424 | up(&c->alloc_sem); | |
425 | printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n"); | |
426 | BUG(); | |
427 | } | |
428 | ||
3be36675 | 429 | if (!c->wbuf_len) /* already checked c->wbuf above */ |
1da177e4 LT |
430 | return 0; |
431 | ||
432 | /* claim remaining space on the page | |
433 | this happens, if we have a change to a new block, | |
434 | or if fsync forces us to flush the writebuffer. | |
435 | if we have a switch to next page, we will not have | |
436 | enough remaining space for this. | |
437 | */ | |
8f15fd55 | 438 | if (pad && !jffs2_dataflash(c)) { |
1da177e4 LT |
439 | c->wbuf_len = PAD(c->wbuf_len); |
440 | ||
441 | /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR | |
442 | with 8 byte page size */ | |
443 | memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len); | |
444 | ||
445 | if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) { | |
446 | struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len); | |
447 | padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
448 | padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING); | |
449 | padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len); | |
450 | padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4)); | |
451 | } | |
452 | } | |
453 | /* else jffs2_flash_writev has actually filled in the rest of the | |
454 | buffer for us, and will deal with the node refs etc. later. */ | |
455 | ||
456 | #ifdef BREAKME | |
457 | static int breakme; | |
458 | if (breakme++ == 20) { | |
459 | printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs); | |
460 | breakme = 0; | |
461 | c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, | |
462 | &retlen, brokenbuf, NULL, c->oobinfo); | |
463 | ret = -EIO; | |
464 | } else | |
465 | #endif | |
466 | ||
467 | if (jffs2_cleanmarker_oob(c)) | |
468 | ret = c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf, NULL, c->oobinfo); | |
469 | else | |
470 | ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf); | |
471 | ||
472 | if (ret || retlen != c->wbuf_pagesize) { | |
473 | if (ret) | |
474 | printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret); | |
475 | else { | |
476 | printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n", | |
477 | retlen, c->wbuf_pagesize); | |
478 | ret = -EIO; | |
479 | } | |
480 | ||
481 | jffs2_wbuf_recover(c); | |
482 | ||
483 | return ret; | |
484 | } | |
485 | ||
486 | spin_lock(&c->erase_completion_lock); | |
487 | ||
488 | /* Adjust free size of the block if we padded. */ | |
8f15fd55 | 489 | if (pad && !jffs2_dataflash(c)) { |
1da177e4 LT |
490 | struct jffs2_eraseblock *jeb; |
491 | ||
492 | jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; | |
493 | ||
494 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n", | |
495 | (jeb==c->nextblock)?"next":"", jeb->offset)); | |
496 | ||
497 | /* wbuf_pagesize - wbuf_len is the amount of space that's to be | |
498 | padded. If there is less free space in the block than that, | |
499 | something screwed up */ | |
500 | if (jeb->free_size < (c->wbuf_pagesize - c->wbuf_len)) { | |
501 | printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n", | |
502 | c->wbuf_ofs, c->wbuf_len, c->wbuf_pagesize-c->wbuf_len); | |
503 | printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n", | |
504 | jeb->offset, jeb->free_size); | |
505 | BUG(); | |
506 | } | |
507 | jeb->free_size -= (c->wbuf_pagesize - c->wbuf_len); | |
508 | c->free_size -= (c->wbuf_pagesize - c->wbuf_len); | |
509 | jeb->wasted_size += (c->wbuf_pagesize - c->wbuf_len); | |
510 | c->wasted_size += (c->wbuf_pagesize - c->wbuf_len); | |
511 | } | |
512 | ||
513 | /* Stick any now-obsoleted blocks on the erase_pending_list */ | |
514 | jffs2_refile_wbuf_blocks(c); | |
515 | jffs2_clear_wbuf_ino_list(c); | |
516 | spin_unlock(&c->erase_completion_lock); | |
517 | ||
518 | memset(c->wbuf,0xff,c->wbuf_pagesize); | |
519 | /* adjust write buffer offset, else we get a non contiguous write bug */ | |
520 | c->wbuf_ofs += c->wbuf_pagesize; | |
521 | c->wbuf_len = 0; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | /* Trigger garbage collection to flush the write-buffer. | |
526 | If ino arg is zero, do it if _any_ real (i.e. not GC) writes are | |
527 | outstanding. If ino arg non-zero, do it only if a write for the | |
528 | given inode is outstanding. */ | |
529 | int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino) | |
530 | { | |
531 | uint32_t old_wbuf_ofs; | |
532 | uint32_t old_wbuf_len; | |
533 | int ret = 0; | |
534 | ||
535 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino)); | |
536 | ||
8aee6ac1 DW |
537 | if (!c->wbuf) |
538 | return 0; | |
539 | ||
1da177e4 LT |
540 | down(&c->alloc_sem); |
541 | if (!jffs2_wbuf_pending_for_ino(c, ino)) { | |
542 | D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino)); | |
543 | up(&c->alloc_sem); | |
544 | return 0; | |
545 | } | |
546 | ||
547 | old_wbuf_ofs = c->wbuf_ofs; | |
548 | old_wbuf_len = c->wbuf_len; | |
549 | ||
550 | if (c->unchecked_size) { | |
551 | /* GC won't make any progress for a while */ | |
552 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n")); | |
553 | down_write(&c->wbuf_sem); | |
554 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); | |
7f716cf3 EH |
555 | /* retry flushing wbuf in case jffs2_wbuf_recover |
556 | left some data in the wbuf */ | |
557 | if (ret) | |
7f716cf3 | 558 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); |
1da177e4 LT |
559 | up_write(&c->wbuf_sem); |
560 | } else while (old_wbuf_len && | |
561 | old_wbuf_ofs == c->wbuf_ofs) { | |
562 | ||
563 | up(&c->alloc_sem); | |
564 | ||
565 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n")); | |
566 | ||
567 | ret = jffs2_garbage_collect_pass(c); | |
568 | if (ret) { | |
569 | /* GC failed. Flush it with padding instead */ | |
570 | down(&c->alloc_sem); | |
571 | down_write(&c->wbuf_sem); | |
572 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); | |
7f716cf3 EH |
573 | /* retry flushing wbuf in case jffs2_wbuf_recover |
574 | left some data in the wbuf */ | |
575 | if (ret) | |
7f716cf3 | 576 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); |
1da177e4 LT |
577 | up_write(&c->wbuf_sem); |
578 | break; | |
579 | } | |
580 | down(&c->alloc_sem); | |
581 | } | |
582 | ||
583 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n")); | |
584 | ||
585 | up(&c->alloc_sem); | |
586 | return ret; | |
587 | } | |
588 | ||
589 | /* Pad write-buffer to end and write it, wasting space. */ | |
590 | int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c) | |
591 | { | |
592 | int ret; | |
593 | ||
8aee6ac1 DW |
594 | if (!c->wbuf) |
595 | return 0; | |
596 | ||
1da177e4 LT |
597 | down_write(&c->wbuf_sem); |
598 | ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); | |
7f716cf3 EH |
599 | /* retry - maybe wbuf recover left some data in wbuf. */ |
600 | if (ret) | |
601 | ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); | |
1da177e4 LT |
602 | up_write(&c->wbuf_sem); |
603 | ||
604 | return ret; | |
605 | } | |
606 | ||
2f82ce1e | 607 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
8f15fd55 AV |
608 | #define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) ) |
609 | #define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) ) | |
610 | #else | |
1da177e4 LT |
611 | #define PAGE_DIV(x) ( (x) & (~(c->wbuf_pagesize - 1)) ) |
612 | #define PAGE_MOD(x) ( (x) & (c->wbuf_pagesize - 1) ) | |
8f15fd55 AV |
613 | #endif |
614 | ||
1da177e4 LT |
615 | int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsigned long count, loff_t to, size_t *retlen, uint32_t ino) |
616 | { | |
617 | struct kvec outvecs[3]; | |
618 | uint32_t totlen = 0; | |
619 | uint32_t split_ofs = 0; | |
620 | uint32_t old_totlen; | |
621 | int ret, splitvec = -1; | |
622 | int invec, outvec; | |
623 | size_t wbuf_retlen; | |
624 | unsigned char *wbuf_ptr; | |
625 | size_t donelen = 0; | |
626 | uint32_t outvec_to = to; | |
627 | ||
628 | /* If not NAND flash, don't bother */ | |
3be36675 | 629 | if (!jffs2_is_writebuffered(c)) |
1da177e4 LT |
630 | return jffs2_flash_direct_writev(c, invecs, count, to, retlen); |
631 | ||
632 | down_write(&c->wbuf_sem); | |
633 | ||
634 | /* If wbuf_ofs is not initialized, set it to target address */ | |
635 | if (c->wbuf_ofs == 0xFFFFFFFF) { | |
636 | c->wbuf_ofs = PAGE_DIV(to); | |
637 | c->wbuf_len = PAGE_MOD(to); | |
638 | memset(c->wbuf,0xff,c->wbuf_pagesize); | |
639 | } | |
640 | ||
641 | /* Fixup the wbuf if we are moving to a new eraseblock. The checks below | |
642 | fail for ECC'd NOR because cleanmarker == 16, so a block starts at | |
643 | xxx0010. */ | |
644 | if (jffs2_nor_ecc(c)) { | |
645 | if (((c->wbuf_ofs % c->sector_size) == 0) && !c->wbuf_len) { | |
646 | c->wbuf_ofs = PAGE_DIV(to); | |
647 | c->wbuf_len = PAGE_MOD(to); | |
648 | memset(c->wbuf,0xff,c->wbuf_pagesize); | |
649 | } | |
650 | } | |
651 | ||
652 | /* Sanity checks on target address. | |
653 | It's permitted to write at PAD(c->wbuf_len+c->wbuf_ofs), | |
654 | and it's permitted to write at the beginning of a new | |
655 | erase block. Anything else, and you die. | |
656 | New block starts at xxx000c (0-b = block header) | |
657 | */ | |
3be36675 | 658 | if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) { |
1da177e4 LT |
659 | /* It's a write to a new block */ |
660 | if (c->wbuf_len) { | |
661 | D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx causes flush of wbuf at 0x%08x\n", (unsigned long)to, c->wbuf_ofs)); | |
662 | ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); | |
663 | if (ret) { | |
664 | /* the underlying layer has to check wbuf_len to do the cleanup */ | |
665 | D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret)); | |
666 | *retlen = 0; | |
667 | goto exit; | |
668 | } | |
669 | } | |
670 | /* set pointer to new block */ | |
671 | c->wbuf_ofs = PAGE_DIV(to); | |
672 | c->wbuf_len = PAGE_MOD(to); | |
673 | } | |
674 | ||
675 | if (to != PAD(c->wbuf_ofs + c->wbuf_len)) { | |
676 | /* We're not writing immediately after the writebuffer. Bad. */ | |
677 | printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write to %08lx\n", (unsigned long)to); | |
678 | if (c->wbuf_len) | |
679 | printk(KERN_CRIT "wbuf was previously %08x-%08x\n", | |
680 | c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len); | |
681 | BUG(); | |
682 | } | |
683 | ||
684 | /* Note outvecs[3] above. We know count is never greater than 2 */ | |
685 | if (count > 2) { | |
686 | printk(KERN_CRIT "jffs2_flash_writev(): count is %ld\n", count); | |
687 | BUG(); | |
688 | } | |
689 | ||
690 | invec = 0; | |
691 | outvec = 0; | |
692 | ||
693 | /* Fill writebuffer first, if already in use */ | |
694 | if (c->wbuf_len) { | |
695 | uint32_t invec_ofs = 0; | |
696 | ||
697 | /* adjust alignment offset */ | |
698 | if (c->wbuf_len != PAGE_MOD(to)) { | |
699 | c->wbuf_len = PAGE_MOD(to); | |
700 | /* take care of alignment to next page */ | |
701 | if (!c->wbuf_len) | |
702 | c->wbuf_len = c->wbuf_pagesize; | |
703 | } | |
704 | ||
705 | while(c->wbuf_len < c->wbuf_pagesize) { | |
706 | uint32_t thislen; | |
707 | ||
708 | if (invec == count) | |
709 | goto alldone; | |
710 | ||
711 | thislen = c->wbuf_pagesize - c->wbuf_len; | |
712 | ||
713 | if (thislen >= invecs[invec].iov_len) | |
714 | thislen = invecs[invec].iov_len; | |
715 | ||
716 | invec_ofs = thislen; | |
717 | ||
718 | memcpy(c->wbuf + c->wbuf_len, invecs[invec].iov_base, thislen); | |
719 | c->wbuf_len += thislen; | |
720 | donelen += thislen; | |
721 | /* Get next invec, if actual did not fill the buffer */ | |
722 | if (c->wbuf_len < c->wbuf_pagesize) | |
723 | invec++; | |
724 | } | |
725 | ||
726 | /* write buffer is full, flush buffer */ | |
727 | ret = __jffs2_flush_wbuf(c, NOPAD); | |
728 | if (ret) { | |
729 | /* the underlying layer has to check wbuf_len to do the cleanup */ | |
730 | D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret)); | |
731 | /* Retlen zero to make sure our caller doesn't mark the space dirty. | |
732 | We've already done everything that's necessary */ | |
733 | *retlen = 0; | |
734 | goto exit; | |
735 | } | |
736 | outvec_to += donelen; | |
737 | c->wbuf_ofs = outvec_to; | |
738 | ||
739 | /* All invecs done ? */ | |
740 | if (invec == count) | |
741 | goto alldone; | |
742 | ||
743 | /* Set up the first outvec, containing the remainder of the | |
744 | invec we partially used */ | |
745 | if (invecs[invec].iov_len > invec_ofs) { | |
746 | outvecs[0].iov_base = invecs[invec].iov_base+invec_ofs; | |
747 | totlen = outvecs[0].iov_len = invecs[invec].iov_len-invec_ofs; | |
748 | if (totlen > c->wbuf_pagesize) { | |
749 | splitvec = outvec; | |
750 | split_ofs = outvecs[0].iov_len - PAGE_MOD(totlen); | |
751 | } | |
752 | outvec++; | |
753 | } | |
754 | invec++; | |
755 | } | |
756 | ||
757 | /* OK, now we've flushed the wbuf and the start of the bits | |
758 | we have been asked to write, now to write the rest.... */ | |
759 | ||
760 | /* totlen holds the amount of data still to be written */ | |
761 | old_totlen = totlen; | |
762 | for ( ; invec < count; invec++,outvec++ ) { | |
763 | outvecs[outvec].iov_base = invecs[invec].iov_base; | |
764 | totlen += outvecs[outvec].iov_len = invecs[invec].iov_len; | |
765 | if (PAGE_DIV(totlen) != PAGE_DIV(old_totlen)) { | |
766 | splitvec = outvec; | |
767 | split_ofs = outvecs[outvec].iov_len - PAGE_MOD(totlen); | |
768 | old_totlen = totlen; | |
769 | } | |
770 | } | |
771 | ||
772 | /* Now the outvecs array holds all the remaining data to write */ | |
773 | /* Up to splitvec,split_ofs is to be written immediately. The rest | |
774 | goes into the (now-empty) wbuf */ | |
775 | ||
776 | if (splitvec != -1) { | |
777 | uint32_t remainder; | |
778 | ||
779 | remainder = outvecs[splitvec].iov_len - split_ofs; | |
780 | outvecs[splitvec].iov_len = split_ofs; | |
781 | ||
782 | /* We did cross a page boundary, so we write some now */ | |
783 | if (jffs2_cleanmarker_oob(c)) | |
784 | ret = c->mtd->writev_ecc(c->mtd, outvecs, splitvec+1, outvec_to, &wbuf_retlen, NULL, c->oobinfo); | |
785 | else | |
786 | ret = jffs2_flash_direct_writev(c, outvecs, splitvec+1, outvec_to, &wbuf_retlen); | |
787 | ||
788 | if (ret < 0 || wbuf_retlen != PAGE_DIV(totlen)) { | |
789 | /* At this point we have no problem, | |
7f716cf3 EH |
790 | c->wbuf is empty. However refile nextblock to avoid |
791 | writing again to same address. | |
1da177e4 | 792 | */ |
7f716cf3 EH |
793 | struct jffs2_eraseblock *jeb; |
794 | ||
795 | spin_lock(&c->erase_completion_lock); | |
796 | ||
797 | jeb = &c->blocks[outvec_to / c->sector_size]; | |
798 | jffs2_block_refile(c, jeb, REFILE_ANYWAY); | |
799 | ||
800 | *retlen = 0; | |
801 | spin_unlock(&c->erase_completion_lock); | |
1da177e4 LT |
802 | goto exit; |
803 | } | |
804 | ||
805 | donelen += wbuf_retlen; | |
806 | c->wbuf_ofs = PAGE_DIV(outvec_to) + PAGE_DIV(totlen); | |
807 | ||
808 | if (remainder) { | |
809 | outvecs[splitvec].iov_base += split_ofs; | |
810 | outvecs[splitvec].iov_len = remainder; | |
811 | } else { | |
812 | splitvec++; | |
813 | } | |
814 | ||
815 | } else { | |
816 | splitvec = 0; | |
817 | } | |
818 | ||
819 | /* Now splitvec points to the start of the bits we have to copy | |
820 | into the wbuf */ | |
821 | wbuf_ptr = c->wbuf; | |
822 | ||
823 | for ( ; splitvec < outvec; splitvec++) { | |
824 | /* Don't copy the wbuf into itself */ | |
825 | if (outvecs[splitvec].iov_base == c->wbuf) | |
826 | continue; | |
827 | memcpy(wbuf_ptr, outvecs[splitvec].iov_base, outvecs[splitvec].iov_len); | |
828 | wbuf_ptr += outvecs[splitvec].iov_len; | |
829 | donelen += outvecs[splitvec].iov_len; | |
830 | } | |
831 | c->wbuf_len = wbuf_ptr - c->wbuf; | |
832 | ||
833 | /* If there's a remainder in the wbuf and it's a non-GC write, | |
834 | remember that the wbuf affects this ino */ | |
835 | alldone: | |
836 | *retlen = donelen; | |
837 | ||
838 | if (c->wbuf_len && ino) | |
839 | jffs2_wbuf_dirties_inode(c, ino); | |
840 | ||
841 | ret = 0; | |
842 | ||
843 | exit: | |
844 | up_write(&c->wbuf_sem); | |
845 | return ret; | |
846 | } | |
847 | ||
848 | /* | |
849 | * This is the entry for flash write. | |
850 | * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev | |
851 | */ | |
852 | int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, const u_char *buf) | |
853 | { | |
854 | struct kvec vecs[1]; | |
855 | ||
3be36675 | 856 | if (!jffs2_is_writebuffered(c)) |
1da177e4 LT |
857 | return c->mtd->write(c->mtd, ofs, len, retlen, buf); |
858 | ||
859 | vecs[0].iov_base = (unsigned char *) buf; | |
860 | vecs[0].iov_len = len; | |
861 | return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0); | |
862 | } | |
863 | ||
864 | /* | |
865 | Handle readback from writebuffer and ECC failure return | |
866 | */ | |
867 | int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf) | |
868 | { | |
869 | loff_t orbf = 0, owbf = 0, lwbf = 0; | |
870 | int ret; | |
871 | ||
3be36675 | 872 | if (!jffs2_is_writebuffered(c)) |
1da177e4 LT |
873 | return c->mtd->read(c->mtd, ofs, len, retlen, buf); |
874 | ||
3be36675 | 875 | /* Read flash */ |
894214d1 | 876 | down_read(&c->wbuf_sem); |
3be36675 AV |
877 | if (jffs2_cleanmarker_oob(c)) |
878 | ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo); | |
879 | else | |
880 | ret = c->mtd->read(c->mtd, ofs, len, retlen, buf); | |
881 | ||
882 | if ( (ret == -EBADMSG) && (*retlen == len) ) { | |
883 | printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n", | |
884 | len, ofs); | |
885 | /* | |
886 | * We have the raw data without ECC correction in the buffer, maybe | |
887 | * we are lucky and all data or parts are correct. We check the node. | |
888 | * If data are corrupted node check will sort it out. | |
889 | * We keep this block, it will fail on write or erase and the we | |
890 | * mark it bad. Or should we do that now? But we should give him a chance. | |
891 | * Maybe we had a system crash or power loss before the ecc write or | |
892 | * a erase was completed. | |
893 | * So we return success. :) | |
894 | */ | |
895 | ret = 0; | |
896 | } | |
897 | ||
1da177e4 LT |
898 | /* if no writebuffer available or write buffer empty, return */ |
899 | if (!c->wbuf_pagesize || !c->wbuf_len) | |
894214d1 | 900 | goto exit; |
1da177e4 LT |
901 | |
902 | /* if we read in a different block, return */ | |
3be36675 | 903 | if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs)) |
894214d1 | 904 | goto exit; |
1da177e4 LT |
905 | |
906 | if (ofs >= c->wbuf_ofs) { | |
907 | owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */ | |
908 | if (owbf > c->wbuf_len) /* is read beyond write buffer ? */ | |
909 | goto exit; | |
910 | lwbf = c->wbuf_len - owbf; /* number of bytes to copy */ | |
911 | if (lwbf > len) | |
912 | lwbf = len; | |
913 | } else { | |
914 | orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */ | |
915 | if (orbf > len) /* is write beyond write buffer ? */ | |
916 | goto exit; | |
917 | lwbf = len - orbf; /* number of bytes to copy */ | |
918 | if (lwbf > c->wbuf_len) | |
919 | lwbf = c->wbuf_len; | |
920 | } | |
921 | if (lwbf > 0) | |
922 | memcpy(buf+orbf,c->wbuf+owbf,lwbf); | |
923 | ||
924 | exit: | |
925 | up_read(&c->wbuf_sem); | |
926 | return ret; | |
927 | } | |
928 | ||
929 | /* | |
930 | * Check, if the out of band area is empty | |
931 | */ | |
932 | int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int mode) | |
933 | { | |
934 | unsigned char *buf; | |
935 | int ret = 0; | |
936 | int i,len,page; | |
937 | size_t retlen; | |
938 | int oob_size; | |
939 | ||
940 | /* allocate a buffer for all oob data in this sector */ | |
941 | oob_size = c->mtd->oobsize; | |
942 | len = 4 * oob_size; | |
943 | buf = kmalloc(len, GFP_KERNEL); | |
944 | if (!buf) { | |
945 | printk(KERN_NOTICE "jffs2_check_oob_empty(): allocation of temporary data buffer for oob check failed\n"); | |
946 | return -ENOMEM; | |
947 | } | |
948 | /* | |
949 | * if mode = 0, we scan for a total empty oob area, else we have | |
950 | * to take care of the cleanmarker in the first page of the block | |
951 | */ | |
952 | ret = jffs2_flash_read_oob(c, jeb->offset, len , &retlen, buf); | |
953 | if (ret) { | |
954 | D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB failed %d for block at %08x\n", ret, jeb->offset)); | |
955 | goto out; | |
956 | } | |
957 | ||
958 | if (retlen < len) { | |
959 | D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB return short read " | |
960 | "(%zd bytes not %d) for block at %08x\n", retlen, len, jeb->offset)); | |
961 | ret = -EIO; | |
962 | goto out; | |
963 | } | |
964 | ||
965 | /* Special check for first page */ | |
966 | for(i = 0; i < oob_size ; i++) { | |
967 | /* Yeah, we know about the cleanmarker. */ | |
968 | if (mode && i >= c->fsdata_pos && | |
969 | i < c->fsdata_pos + c->fsdata_len) | |
970 | continue; | |
971 | ||
972 | if (buf[i] != 0xFF) { | |
973 | D2(printk(KERN_DEBUG "Found %02x at %x in OOB for %08x\n", | |
974 | buf[page+i], page+i, jeb->offset)); | |
975 | ret = 1; | |
976 | goto out; | |
977 | } | |
978 | } | |
979 | ||
980 | /* we know, we are aligned :) */ | |
981 | for (page = oob_size; page < len; page += sizeof(long)) { | |
982 | unsigned long dat = *(unsigned long *)(&buf[page]); | |
983 | if(dat != -1) { | |
984 | ret = 1; | |
985 | goto out; | |
986 | } | |
987 | } | |
988 | ||
989 | out: | |
990 | kfree(buf); | |
991 | ||
992 | return ret; | |
993 | } | |
994 | ||
995 | /* | |
996 | * Scan for a valid cleanmarker and for bad blocks | |
997 | * For virtual blocks (concatenated physical blocks) check the cleanmarker | |
998 | * only in the first page of the first physical block, but scan for bad blocks in all | |
999 | * physical blocks | |
1000 | */ | |
1001 | int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
1002 | { | |
1003 | struct jffs2_unknown_node n; | |
1004 | unsigned char buf[2 * NAND_MAX_OOBSIZE]; | |
1005 | unsigned char *p; | |
1006 | int ret, i, cnt, retval = 0; | |
1007 | size_t retlen, offset; | |
1008 | int oob_size; | |
1009 | ||
1010 | offset = jeb->offset; | |
1011 | oob_size = c->mtd->oobsize; | |
1012 | ||
1013 | /* Loop through the physical blocks */ | |
1014 | for (cnt = 0; cnt < (c->sector_size / c->mtd->erasesize); cnt++) { | |
1015 | /* Check first if the block is bad. */ | |
1016 | if (c->mtd->block_isbad (c->mtd, offset)) { | |
1017 | D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Bad block at %08x\n", jeb->offset)); | |
1018 | return 2; | |
1019 | } | |
1020 | /* | |
1021 | * We read oob data from page 0 and 1 of the block. | |
1022 | * page 0 contains cleanmarker and badblock info | |
1023 | * page 1 contains failure count of this block | |
1024 | */ | |
1025 | ret = c->mtd->read_oob (c->mtd, offset, oob_size << 1, &retlen, buf); | |
1026 | ||
1027 | if (ret) { | |
1028 | D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB failed %d for block at %08x\n", ret, jeb->offset)); | |
1029 | return ret; | |
1030 | } | |
1031 | if (retlen < (oob_size << 1)) { | |
1032 | D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB return short read (%zd bytes not %d) for block at %08x\n", retlen, oob_size << 1, jeb->offset)); | |
1033 | return -EIO; | |
1034 | } | |
1035 | ||
1036 | /* Check cleanmarker only on the first physical block */ | |
1037 | if (!cnt) { | |
1038 | n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK); | |
1039 | n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER); | |
1040 | n.totlen = cpu_to_je32 (8); | |
1041 | p = (unsigned char *) &n; | |
1042 | ||
1043 | for (i = 0; i < c->fsdata_len; i++) { | |
1044 | if (buf[c->fsdata_pos + i] != p[i]) { | |
1045 | retval = 1; | |
1046 | } | |
1047 | } | |
1048 | D1(if (retval == 1) { | |
1049 | printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): Cleanmarker node not detected in block at %08x\n", jeb->offset); | |
1050 | printk(KERN_WARNING "OOB at %08x was ", offset); | |
1051 | for (i=0; i < oob_size; i++) { | |
1052 | printk("%02x ", buf[i]); | |
1053 | } | |
1054 | printk("\n"); | |
1055 | }) | |
1056 | } | |
1057 | offset += c->mtd->erasesize; | |
1058 | } | |
1059 | return retval; | |
1060 | } | |
1061 | ||
1062 | int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
1063 | { | |
1064 | struct jffs2_unknown_node n; | |
1065 | int ret; | |
1066 | size_t retlen; | |
1067 | ||
1068 | n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
1069 | n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER); | |
1070 | n.totlen = cpu_to_je32(8); | |
1071 | ||
1072 | ret = jffs2_flash_write_oob(c, jeb->offset + c->fsdata_pos, c->fsdata_len, &retlen, (unsigned char *)&n); | |
1073 | ||
1074 | if (ret) { | |
1075 | D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); | |
1076 | return ret; | |
1077 | } | |
1078 | if (retlen != c->fsdata_len) { | |
1079 | D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Short write for block at %08x: %zd not %d\n", jeb->offset, retlen, c->fsdata_len)); | |
1080 | return ret; | |
1081 | } | |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * On NAND we try to mark this block bad. If the block was erased more | |
1087 | * than MAX_ERASE_FAILURES we mark it finaly bad. | |
1088 | * Don't care about failures. This block remains on the erase-pending | |
1089 | * or badblock list as long as nobody manipulates the flash with | |
1090 | * a bootloader or something like that. | |
1091 | */ | |
1092 | ||
1093 | int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset) | |
1094 | { | |
1095 | int ret; | |
1096 | ||
1097 | /* if the count is < max, we try to write the counter to the 2nd page oob area */ | |
1098 | if( ++jeb->bad_count < MAX_ERASE_FAILURES) | |
1099 | return 0; | |
1100 | ||
1101 | if (!c->mtd->block_markbad) | |
1102 | return 1; // What else can we do? | |
1103 | ||
1104 | D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset)); | |
1105 | ret = c->mtd->block_markbad(c->mtd, bad_offset); | |
1106 | ||
1107 | if (ret) { | |
1108 | D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); | |
1109 | return ret; | |
1110 | } | |
1111 | return 1; | |
1112 | } | |
1113 | ||
1114 | #define NAND_JFFS2_OOB16_FSDALEN 8 | |
1115 | ||
1116 | static struct nand_oobinfo jffs2_oobinfo_docecc = { | |
1117 | .useecc = MTD_NANDECC_PLACE, | |
1118 | .eccbytes = 6, | |
1119 | .eccpos = {0,1,2,3,4,5} | |
1120 | }; | |
1121 | ||
1122 | ||
1123 | static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c) | |
1124 | { | |
1125 | struct nand_oobinfo *oinfo = &c->mtd->oobinfo; | |
1126 | ||
1127 | /* Do this only, if we have an oob buffer */ | |
1128 | if (!c->mtd->oobsize) | |
1129 | return 0; | |
1130 | ||
1131 | /* Cleanmarker is out-of-band, so inline size zero */ | |
1132 | c->cleanmarker_size = 0; | |
1133 | ||
1134 | /* Should we use autoplacement ? */ | |
1135 | if (oinfo && oinfo->useecc == MTD_NANDECC_AUTOPLACE) { | |
1136 | D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n")); | |
1137 | /* Get the position of the free bytes */ | |
1138 | if (!oinfo->oobfree[0][1]) { | |
1139 | printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep. Autoplacement selected and no empty space in oob\n"); | |
1140 | return -ENOSPC; | |
1141 | } | |
1142 | c->fsdata_pos = oinfo->oobfree[0][0]; | |
1143 | c->fsdata_len = oinfo->oobfree[0][1]; | |
1144 | if (c->fsdata_len > 8) | |
1145 | c->fsdata_len = 8; | |
1146 | } else { | |
1147 | /* This is just a legacy fallback and should go away soon */ | |
1148 | switch(c->mtd->ecctype) { | |
1149 | case MTD_ECC_RS_DiskOnChip: | |
1150 | printk(KERN_WARNING "JFFS2 using DiskOnChip hardware ECC without autoplacement. Fix it!\n"); | |
1151 | c->oobinfo = &jffs2_oobinfo_docecc; | |
1152 | c->fsdata_pos = 6; | |
1153 | c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN; | |
1154 | c->badblock_pos = 15; | |
1155 | break; | |
1156 | ||
1157 | default: | |
1158 | D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n")); | |
1159 | return -EINVAL; | |
1160 | } | |
1161 | } | |
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | int jffs2_nand_flash_setup(struct jffs2_sb_info *c) | |
1166 | { | |
1167 | int res; | |
1168 | ||
1169 | /* Initialise write buffer */ | |
1170 | init_rwsem(&c->wbuf_sem); | |
1171 | c->wbuf_pagesize = c->mtd->oobblock; | |
1172 | c->wbuf_ofs = 0xFFFFFFFF; | |
1173 | ||
1174 | c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); | |
1175 | if (!c->wbuf) | |
1176 | return -ENOMEM; | |
1177 | ||
1178 | res = jffs2_nand_set_oobinfo(c); | |
1179 | ||
1180 | #ifdef BREAKME | |
1181 | if (!brokenbuf) | |
1182 | brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); | |
1183 | if (!brokenbuf) { | |
1184 | kfree(c->wbuf); | |
1185 | return -ENOMEM; | |
1186 | } | |
1187 | memset(brokenbuf, 0xdb, c->wbuf_pagesize); | |
1188 | #endif | |
1189 | return res; | |
1190 | } | |
1191 | ||
1192 | void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c) | |
1193 | { | |
1194 | kfree(c->wbuf); | |
1195 | } | |
1196 | ||
8f15fd55 AV |
1197 | int jffs2_dataflash_setup(struct jffs2_sb_info *c) { |
1198 | c->cleanmarker_size = 0; /* No cleanmarkers needed */ | |
1199 | ||
1200 | /* Initialize write buffer */ | |
1201 | init_rwsem(&c->wbuf_sem); | |
1202 | c->wbuf_pagesize = c->sector_size; | |
1203 | c->wbuf_ofs = 0xFFFFFFFF; | |
1204 | ||
1205 | c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); | |
1206 | if (!c->wbuf) | |
1207 | return -ENOMEM; | |
1208 | ||
1209 | printk(KERN_INFO "JFFS2 write-buffering enabled (%i)\n", c->wbuf_pagesize); | |
1210 | ||
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) { | |
1215 | kfree(c->wbuf); | |
1216 | } | |
8f15fd55 | 1217 | |
1da177e4 LT |
1218 | int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) { |
1219 | /* Cleanmarker is actually larger on the flashes */ | |
1220 | c->cleanmarker_size = 16; | |
1221 | ||
1222 | /* Initialize write buffer */ | |
1223 | init_rwsem(&c->wbuf_sem); | |
1224 | c->wbuf_pagesize = c->mtd->eccsize; | |
1225 | c->wbuf_ofs = 0xFFFFFFFF; | |
1226 | ||
1227 | c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); | |
1228 | if (!c->wbuf) | |
1229 | return -ENOMEM; | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c) { | |
1235 | kfree(c->wbuf); | |
1236 | } |