Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e DW |
4 | * Copyright © 2001-2007 Red Hat, Inc. |
5 | * Copyright © 2004 Thomas Gleixner <tglx@linutronix.de> | |
1da177e4 LT |
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 | * | |
1da177e4 LT |
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> | |
4e57b681 | 19 | #include <linux/jiffies.h> |
914e2637 | 20 | #include <linux/sched.h> |
4e57b681 | 21 | |
1da177e4 LT |
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 | ||
daba5cc4 AB |
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 | ||
1da177e4 LT |
35 | /* max. erase failures before we mark a block bad */ |
36 | #define MAX_ERASE_FAILURES 2 | |
37 | ||
1da177e4 LT |
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... */ | |
4d952709 | 87 | jffs2_erase_pending_trigger(c); |
1da177e4 LT |
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 | ||
7f716cf3 EH |
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) | |
1da177e4 LT |
138 | { |
139 | D1(printk("About to refile bad block at %08x\n", jeb->offset)); | |
140 | ||
1da177e4 LT |
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 | } | |
1da177e4 | 157 | |
9bfeb691 DW |
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 | } | |
1da177e4 | 170 | |
e0c8e42f AB |
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); | |
1da177e4 LT |
174 | } |
175 | ||
9bfeb691 DW |
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: | |
ddc58bd6 DW |
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 | } | |
9bfeb691 DW |
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; | |
9bfeb691 DW |
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(); | |
ddc58bd6 | 214 | |
9bfeb691 DW |
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 | ||
1da177e4 LT |
223 | /* Recover from failure to write wbuf. Recover the nodes up to the |
224 | * wbuf, not the one which we were starting to try to write. */ | |
225 | ||
226 | static void jffs2_wbuf_recover(struct jffs2_sb_info *c) | |
227 | { | |
228 | struct jffs2_eraseblock *jeb, *new_jeb; | |
9bfeb691 | 229 | struct jffs2_raw_node_ref *raw, *next, *first_raw = NULL; |
1da177e4 LT |
230 | size_t retlen; |
231 | int ret; | |
9bfeb691 | 232 | int nr_refile = 0; |
1da177e4 LT |
233 | unsigned char *buf; |
234 | uint32_t start, end, ofs, len; | |
235 | ||
046b8b98 DW |
236 | jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; |
237 | ||
1da177e4 | 238 | spin_lock(&c->erase_completion_lock); |
180bfb31 VW |
239 | if (c->wbuf_ofs % c->mtd->erasesize) |
240 | jffs2_block_refile(c, jeb, REFILE_NOTEMPTY); | |
241 | else | |
242 | jffs2_block_refile(c, jeb, REFILE_ANYWAY); | |
9bfeb691 DW |
243 | spin_unlock(&c->erase_completion_lock); |
244 | ||
245 | BUG_ON(!ref_obsolete(jeb->last_node)); | |
1da177e4 LT |
246 | |
247 | /* Find the first node to be recovered, by skipping over every | |
248 | node which ends before the wbuf starts, or which is obsolete. */ | |
9bfeb691 DW |
249 | for (next = raw = jeb->first_node; next; raw = next) { |
250 | next = ref_next(raw); | |
251 | ||
252 | if (ref_obsolete(raw) || | |
253 | (next && ref_offset(next) <= c->wbuf_ofs)) { | |
254 | dbg_noderef("Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n", | |
255 | ref_offset(raw), ref_flags(raw), | |
256 | (ref_offset(raw) + ref_totlen(c, jeb, raw)), | |
257 | c->wbuf_ofs); | |
258 | continue; | |
259 | } | |
260 | dbg_noderef("First node to be recovered is at 0x%08x(%d)-0x%08x\n", | |
261 | ref_offset(raw), ref_flags(raw), | |
262 | (ref_offset(raw) + ref_totlen(c, jeb, raw))); | |
263 | ||
264 | first_raw = raw; | |
265 | break; | |
266 | } | |
267 | ||
268 | if (!first_raw) { | |
1da177e4 LT |
269 | /* All nodes were obsolete. Nothing to recover. */ |
270 | D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n")); | |
9bfeb691 | 271 | c->wbuf_len = 0; |
1da177e4 LT |
272 | return; |
273 | } | |
274 | ||
9bfeb691 DW |
275 | start = ref_offset(first_raw); |
276 | end = ref_offset(jeb->last_node); | |
277 | nr_refile = 1; | |
1da177e4 | 278 | |
9bfeb691 DW |
279 | /* Count the number of refs which need to be copied */ |
280 | while ((raw = ref_next(raw)) != jeb->last_node) | |
281 | nr_refile++; | |
1da177e4 | 282 | |
9bfeb691 DW |
283 | dbg_noderef("wbuf recover %08x-%08x (%d bytes in %d nodes)\n", |
284 | start, end, end - start, nr_refile); | |
1da177e4 LT |
285 | |
286 | buf = NULL; | |
287 | if (start < c->wbuf_ofs) { | |
288 | /* First affected node was already partially written. | |
289 | * Attempt to reread the old data into our buffer. */ | |
290 | ||
291 | buf = kmalloc(end - start, GFP_KERNEL); | |
292 | if (!buf) { | |
293 | printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n"); | |
294 | ||
295 | goto read_failed; | |
296 | } | |
297 | ||
298 | /* Do the read... */ | |
9223a456 | 299 | ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf); |
182ec4ee | 300 | |
9a1fcdfd TG |
301 | /* ECC recovered ? */ |
302 | if ((ret == -EUCLEAN || ret == -EBADMSG) && | |
303 | (retlen == c->wbuf_ofs - start)) | |
1da177e4 | 304 | ret = 0; |
9a1fcdfd | 305 | |
1da177e4 LT |
306 | if (ret || retlen != c->wbuf_ofs - start) { |
307 | printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n"); | |
308 | ||
309 | kfree(buf); | |
310 | buf = NULL; | |
311 | read_failed: | |
9bfeb691 DW |
312 | first_raw = ref_next(first_raw); |
313 | nr_refile--; | |
314 | while (first_raw && ref_obsolete(first_raw)) { | |
315 | first_raw = ref_next(first_raw); | |
316 | nr_refile--; | |
317 | } | |
318 | ||
1da177e4 | 319 | /* If this was the only node to be recovered, give up */ |
9bfeb691 DW |
320 | if (!first_raw) { |
321 | c->wbuf_len = 0; | |
1da177e4 | 322 | return; |
9bfeb691 | 323 | } |
1da177e4 LT |
324 | |
325 | /* It wasn't. Go on and try to recover nodes complete in the wbuf */ | |
9bfeb691 DW |
326 | start = ref_offset(first_raw); |
327 | dbg_noderef("wbuf now recover %08x-%08x (%d bytes in %d nodes)\n", | |
328 | start, end, end - start, nr_refile); | |
329 | ||
1da177e4 LT |
330 | } else { |
331 | /* Read succeeded. Copy the remaining data from the wbuf */ | |
332 | memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs); | |
333 | } | |
334 | } | |
335 | /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards. | |
336 | Either 'buf' contains the data, or we find it in the wbuf */ | |
337 | ||
1da177e4 | 338 | /* ... and get an allocation of space from a shiny new block instead */ |
9fe4854c | 339 | ret = jffs2_reserve_space_gc(c, end-start, &len, JFFS2_SUMMARY_NOSUM_SIZE); |
1da177e4 LT |
340 | if (ret) { |
341 | printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n"); | |
9b88f473 | 342 | kfree(buf); |
1da177e4 LT |
343 | return; |
344 | } | |
9bfeb691 | 345 | |
7f762ab2 AH |
346 | /* The summary is not recovered, so it must be disabled for this erase block */ |
347 | jffs2_sum_disable_collecting(c->summary); | |
348 | ||
9bfeb691 DW |
349 | ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, nr_refile); |
350 | if (ret) { | |
351 | printk(KERN_WARNING "Failed to allocate node refs for wbuf recovery. Data loss ensues.\n"); | |
352 | kfree(buf); | |
353 | return; | |
354 | } | |
355 | ||
9fe4854c DW |
356 | ofs = write_ofs(c); |
357 | ||
1da177e4 | 358 | if (end-start >= c->wbuf_pagesize) { |
7f716cf3 | 359 | /* Need to do another write immediately, but it's possible |
9b88f473 | 360 | that this is just because the wbuf itself is completely |
182ec4ee TG |
361 | full, and there's nothing earlier read back from the |
362 | flash. Hence 'buf' isn't necessarily what we're writing | |
9b88f473 | 363 | from. */ |
7f716cf3 | 364 | unsigned char *rewrite_buf = buf?:c->wbuf; |
1da177e4 LT |
365 | uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize); |
366 | ||
367 | D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n", | |
368 | towrite, ofs)); | |
182ec4ee | 369 | |
1da177e4 LT |
370 | #ifdef BREAKMEHEADER |
371 | static int breakme; | |
372 | if (breakme++ == 20) { | |
373 | printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs); | |
374 | breakme = 0; | |
9223a456 TG |
375 | c->mtd->write(c->mtd, ofs, towrite, &retlen, |
376 | brokenbuf); | |
1da177e4 LT |
377 | ret = -EIO; |
378 | } else | |
379 | #endif | |
9223a456 TG |
380 | ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, |
381 | rewrite_buf); | |
1da177e4 LT |
382 | |
383 | if (ret || retlen != towrite) { | |
384 | /* Argh. We tried. Really we did. */ | |
385 | printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n"); | |
9b88f473 | 386 | kfree(buf); |
1da177e4 | 387 | |
2f785402 | 388 | if (retlen) |
9bfeb691 | 389 | jffs2_add_physical_node_ref(c, ofs | REF_OBSOLETE, ref_totlen(c, jeb, first_raw), NULL); |
1da177e4 | 390 | |
1da177e4 LT |
391 | return; |
392 | } | |
393 | printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs); | |
394 | ||
395 | c->wbuf_len = (end - start) - towrite; | |
396 | c->wbuf_ofs = ofs + towrite; | |
7f716cf3 | 397 | memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len); |
1da177e4 | 398 | /* Don't muck about with c->wbuf_inodes. False positives are harmless. */ |
1da177e4 LT |
399 | } else { |
400 | /* OK, now we're left with the dregs in whichever buffer we're using */ | |
401 | if (buf) { | |
402 | memcpy(c->wbuf, buf, end-start); | |
1da177e4 LT |
403 | } else { |
404 | memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start); | |
405 | } | |
406 | c->wbuf_ofs = ofs; | |
407 | c->wbuf_len = end - start; | |
408 | } | |
409 | ||
410 | /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */ | |
411 | new_jeb = &c->blocks[ofs / c->sector_size]; | |
412 | ||
413 | spin_lock(&c->erase_completion_lock); | |
9bfeb691 DW |
414 | for (raw = first_raw; raw != jeb->last_node; raw = ref_next(raw)) { |
415 | uint32_t rawlen = ref_totlen(c, jeb, raw); | |
416 | struct jffs2_inode_cache *ic; | |
417 | struct jffs2_raw_node_ref *new_ref; | |
418 | struct jffs2_raw_node_ref **adjust_ref = NULL; | |
419 | struct jffs2_inode_info *f = NULL; | |
1da177e4 LT |
420 | |
421 | D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n", | |
9bfeb691 DW |
422 | rawlen, ref_offset(raw), ref_flags(raw), ofs)); |
423 | ||
424 | ic = jffs2_raw_ref_to_ic(raw); | |
425 | ||
426 | /* Ick. This XATTR mess should be fixed shortly... */ | |
427 | if (ic && ic->class == RAWNODE_CLASS_XATTR_DATUM) { | |
428 | struct jffs2_xattr_datum *xd = (void *)ic; | |
429 | BUG_ON(xd->node != raw); | |
430 | adjust_ref = &xd->node; | |
431 | raw->next_in_ino = NULL; | |
432 | ic = NULL; | |
433 | } else if (ic && ic->class == RAWNODE_CLASS_XATTR_REF) { | |
434 | struct jffs2_xattr_datum *xr = (void *)ic; | |
435 | BUG_ON(xr->node != raw); | |
436 | adjust_ref = &xr->node; | |
437 | raw->next_in_ino = NULL; | |
438 | ic = NULL; | |
439 | } else if (ic && ic->class == RAWNODE_CLASS_INODE_CACHE) { | |
440 | struct jffs2_raw_node_ref **p = &ic->nodes; | |
441 | ||
442 | /* Remove the old node from the per-inode list */ | |
443 | while (*p && *p != (void *)ic) { | |
444 | if (*p == raw) { | |
445 | (*p) = (raw->next_in_ino); | |
446 | raw->next_in_ino = NULL; | |
447 | break; | |
448 | } | |
449 | p = &((*p)->next_in_ino); | |
450 | } | |
1da177e4 | 451 | |
9bfeb691 DW |
452 | if (ic->state == INO_STATE_PRESENT && !ref_obsolete(raw)) { |
453 | /* If it's an in-core inode, then we have to adjust any | |
454 | full_dirent or full_dnode structure to point to the | |
455 | new version instead of the old */ | |
456 | f = jffs2_gc_fetch_inode(c, ic->ino, ic->nlink); | |
457 | if (IS_ERR(f)) { | |
458 | /* Should never happen; it _must_ be present */ | |
459 | JFFS2_ERROR("Failed to iget() ino #%u, err %ld\n", | |
460 | ic->ino, PTR_ERR(f)); | |
461 | BUG(); | |
462 | } | |
463 | /* We don't lock f->sem. There's a number of ways we could | |
464 | end up in here with it already being locked, and nobody's | |
465 | going to modify it on us anyway because we hold the | |
466 | alloc_sem. We're only changing one ->raw pointer too, | |
467 | which we can get away with without upsetting readers. */ | |
468 | adjust_ref = jffs2_incore_replace_raw(c, f, raw, | |
469 | (void *)(buf?:c->wbuf) + (ref_offset(raw) - start)); | |
470 | } else if (unlikely(ic->state != INO_STATE_PRESENT && | |
471 | ic->state != INO_STATE_CHECKEDABSENT && | |
472 | ic->state != INO_STATE_GC)) { | |
473 | JFFS2_ERROR("Inode #%u is in strange state %d!\n", ic->ino, ic->state); | |
474 | BUG(); | |
475 | } | |
476 | } | |
477 | ||
478 | new_ref = jffs2_link_node_ref(c, new_jeb, ofs | ref_flags(raw), rawlen, ic); | |
479 | ||
480 | if (adjust_ref) { | |
481 | BUG_ON(*adjust_ref != raw); | |
482 | *adjust_ref = new_ref; | |
483 | } | |
484 | if (f) | |
485 | jffs2_gc_release_inode(c, f); | |
486 | ||
487 | if (!ref_obsolete(raw)) { | |
1da177e4 LT |
488 | jeb->dirty_size += rawlen; |
489 | jeb->used_size -= rawlen; | |
490 | c->dirty_size += rawlen; | |
9bfeb691 DW |
491 | c->used_size -= rawlen; |
492 | raw->flash_offset = ref_offset(raw) | REF_OBSOLETE; | |
493 | BUG_ON(raw->next_in_ino); | |
1da177e4 | 494 | } |
1da177e4 | 495 | ofs += rawlen; |
1da177e4 LT |
496 | } |
497 | ||
9bfeb691 DW |
498 | kfree(buf); |
499 | ||
1da177e4 | 500 | /* Fix up the original jeb now it's on the bad_list */ |
9bfeb691 | 501 | if (first_raw == jeb->first_node) { |
1da177e4 | 502 | D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset)); |
f116629d | 503 | list_move(&jeb->list, &c->erase_pending_list); |
1da177e4 LT |
504 | c->nr_erasing_blocks++; |
505 | jffs2_erase_pending_trigger(c); | |
506 | } | |
1da177e4 | 507 | |
e0c8e42f | 508 | jffs2_dbg_acct_sanity_check_nolock(c, jeb); |
9bfeb691 | 509 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
1da177e4 | 510 | |
e0c8e42f | 511 | jffs2_dbg_acct_sanity_check_nolock(c, new_jeb); |
9bfeb691 | 512 | jffs2_dbg_acct_paranoia_check_nolock(c, new_jeb); |
1da177e4 LT |
513 | |
514 | spin_unlock(&c->erase_completion_lock); | |
515 | ||
9bfeb691 DW |
516 | D1(printk(KERN_DEBUG "wbuf recovery completed OK. wbuf_ofs 0x%08x, len 0x%x\n", c->wbuf_ofs, c->wbuf_len)); |
517 | ||
1da177e4 LT |
518 | } |
519 | ||
520 | /* Meaning of pad argument: | |
521 | 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway. | |
522 | 1: Pad, do not adjust nextblock free_size | |
523 | 2: Pad, adjust nextblock free_size | |
524 | */ | |
525 | #define NOPAD 0 | |
526 | #define PAD_NOACCOUNT 1 | |
527 | #define PAD_ACCOUNTING 2 | |
528 | ||
529 | static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad) | |
530 | { | |
9bfeb691 | 531 | struct jffs2_eraseblock *wbuf_jeb; |
1da177e4 LT |
532 | int ret; |
533 | size_t retlen; | |
534 | ||
3be36675 | 535 | /* Nothing to do if not write-buffering the flash. In particular, we shouldn't |
1da177e4 | 536 | del_timer() the timer we never initialised. */ |
3be36675 | 537 | if (!jffs2_is_writebuffered(c)) |
1da177e4 LT |
538 | return 0; |
539 | ||
540 | if (!down_trylock(&c->alloc_sem)) { | |
541 | up(&c->alloc_sem); | |
542 | printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n"); | |
543 | BUG(); | |
544 | } | |
545 | ||
3be36675 | 546 | if (!c->wbuf_len) /* already checked c->wbuf above */ |
1da177e4 LT |
547 | return 0; |
548 | ||
9bfeb691 DW |
549 | wbuf_jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; |
550 | if (jffs2_prealloc_raw_node_refs(c, wbuf_jeb, c->nextblock->allocated_refs + 1)) | |
2f785402 DW |
551 | return -ENOMEM; |
552 | ||
1da177e4 LT |
553 | /* claim remaining space on the page |
554 | this happens, if we have a change to a new block, | |
555 | or if fsync forces us to flush the writebuffer. | |
556 | if we have a switch to next page, we will not have | |
182ec4ee | 557 | enough remaining space for this. |
1da177e4 | 558 | */ |
daba5cc4 | 559 | if (pad ) { |
1da177e4 LT |
560 | c->wbuf_len = PAD(c->wbuf_len); |
561 | ||
562 | /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR | |
563 | with 8 byte page size */ | |
564 | memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len); | |
182ec4ee | 565 | |
1da177e4 LT |
566 | if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) { |
567 | struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len); | |
568 | padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
569 | padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING); | |
570 | padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len); | |
571 | padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4)); | |
572 | } | |
573 | } | |
574 | /* else jffs2_flash_writev has actually filled in the rest of the | |
575 | buffer for us, and will deal with the node refs etc. later. */ | |
182ec4ee | 576 | |
1da177e4 LT |
577 | #ifdef BREAKME |
578 | static int breakme; | |
579 | if (breakme++ == 20) { | |
580 | printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs); | |
581 | breakme = 0; | |
9223a456 TG |
582 | c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, |
583 | brokenbuf); | |
1da177e4 | 584 | ret = -EIO; |
182ec4ee | 585 | } else |
1da177e4 | 586 | #endif |
182ec4ee | 587 | |
1da177e4 LT |
588 | ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf); |
589 | ||
590 | if (ret || retlen != c->wbuf_pagesize) { | |
591 | if (ret) | |
592 | printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret); | |
593 | else { | |
594 | printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n", | |
595 | retlen, c->wbuf_pagesize); | |
596 | ret = -EIO; | |
597 | } | |
598 | ||
599 | jffs2_wbuf_recover(c); | |
600 | ||
601 | return ret; | |
602 | } | |
603 | ||
1da177e4 | 604 | /* Adjust free size of the block if we padded. */ |
daba5cc4 | 605 | if (pad) { |
0bcc099d | 606 | uint32_t waste = c->wbuf_pagesize - c->wbuf_len; |
1da177e4 | 607 | |
1da177e4 | 608 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n", |
9bfeb691 | 609 | (wbuf_jeb==c->nextblock)?"next":"", wbuf_jeb->offset)); |
1da177e4 | 610 | |
182ec4ee | 611 | /* wbuf_pagesize - wbuf_len is the amount of space that's to be |
1da177e4 LT |
612 | padded. If there is less free space in the block than that, |
613 | something screwed up */ | |
9bfeb691 | 614 | if (wbuf_jeb->free_size < waste) { |
1da177e4 | 615 | printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n", |
0bcc099d | 616 | c->wbuf_ofs, c->wbuf_len, waste); |
1da177e4 | 617 | printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n", |
9bfeb691 | 618 | wbuf_jeb->offset, wbuf_jeb->free_size); |
1da177e4 LT |
619 | BUG(); |
620 | } | |
0bcc099d DW |
621 | |
622 | spin_lock(&c->erase_completion_lock); | |
623 | ||
9bfeb691 | 624 | jffs2_link_node_ref(c, wbuf_jeb, (c->wbuf_ofs + c->wbuf_len) | REF_OBSOLETE, waste, NULL); |
0bcc099d | 625 | /* FIXME: that made it count as dirty. Convert to wasted */ |
9bfeb691 | 626 | wbuf_jeb->dirty_size -= waste; |
0bcc099d | 627 | c->dirty_size -= waste; |
9bfeb691 | 628 | wbuf_jeb->wasted_size += waste; |
0bcc099d DW |
629 | c->wasted_size += waste; |
630 | } else | |
631 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
632 | |
633 | /* Stick any now-obsoleted blocks on the erase_pending_list */ | |
634 | jffs2_refile_wbuf_blocks(c); | |
635 | jffs2_clear_wbuf_ino_list(c); | |
636 | spin_unlock(&c->erase_completion_lock); | |
637 | ||
638 | memset(c->wbuf,0xff,c->wbuf_pagesize); | |
639 | /* adjust write buffer offset, else we get a non contiguous write bug */ | |
640 | c->wbuf_ofs += c->wbuf_pagesize; | |
641 | c->wbuf_len = 0; | |
642 | return 0; | |
643 | } | |
644 | ||
182ec4ee | 645 | /* Trigger garbage collection to flush the write-buffer. |
1da177e4 | 646 | If ino arg is zero, do it if _any_ real (i.e. not GC) writes are |
182ec4ee | 647 | outstanding. If ino arg non-zero, do it only if a write for the |
1da177e4 LT |
648 | given inode is outstanding. */ |
649 | int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino) | |
650 | { | |
651 | uint32_t old_wbuf_ofs; | |
652 | uint32_t old_wbuf_len; | |
653 | int ret = 0; | |
654 | ||
655 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino)); | |
656 | ||
8aee6ac1 DW |
657 | if (!c->wbuf) |
658 | return 0; | |
659 | ||
1da177e4 LT |
660 | down(&c->alloc_sem); |
661 | if (!jffs2_wbuf_pending_for_ino(c, ino)) { | |
662 | D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino)); | |
663 | up(&c->alloc_sem); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | old_wbuf_ofs = c->wbuf_ofs; | |
668 | old_wbuf_len = c->wbuf_len; | |
669 | ||
670 | if (c->unchecked_size) { | |
671 | /* GC won't make any progress for a while */ | |
672 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n")); | |
673 | down_write(&c->wbuf_sem); | |
674 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); | |
7f716cf3 EH |
675 | /* retry flushing wbuf in case jffs2_wbuf_recover |
676 | left some data in the wbuf */ | |
677 | if (ret) | |
7f716cf3 | 678 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); |
1da177e4 LT |
679 | up_write(&c->wbuf_sem); |
680 | } else while (old_wbuf_len && | |
681 | old_wbuf_ofs == c->wbuf_ofs) { | |
682 | ||
683 | up(&c->alloc_sem); | |
684 | ||
685 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n")); | |
686 | ||
687 | ret = jffs2_garbage_collect_pass(c); | |
688 | if (ret) { | |
689 | /* GC failed. Flush it with padding instead */ | |
690 | down(&c->alloc_sem); | |
691 | down_write(&c->wbuf_sem); | |
692 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); | |
7f716cf3 EH |
693 | /* retry flushing wbuf in case jffs2_wbuf_recover |
694 | left some data in the wbuf */ | |
695 | if (ret) | |
7f716cf3 | 696 | ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); |
1da177e4 LT |
697 | up_write(&c->wbuf_sem); |
698 | break; | |
699 | } | |
700 | down(&c->alloc_sem); | |
701 | } | |
702 | ||
703 | D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n")); | |
704 | ||
705 | up(&c->alloc_sem); | |
706 | return ret; | |
707 | } | |
708 | ||
709 | /* Pad write-buffer to end and write it, wasting space. */ | |
710 | int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c) | |
711 | { | |
712 | int ret; | |
713 | ||
8aee6ac1 DW |
714 | if (!c->wbuf) |
715 | return 0; | |
716 | ||
1da177e4 LT |
717 | down_write(&c->wbuf_sem); |
718 | ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); | |
7f716cf3 EH |
719 | /* retry - maybe wbuf recover left some data in wbuf. */ |
720 | if (ret) | |
721 | ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); | |
1da177e4 LT |
722 | up_write(&c->wbuf_sem); |
723 | ||
724 | return ret; | |
725 | } | |
dcb09328 TG |
726 | |
727 | static size_t jffs2_fill_wbuf(struct jffs2_sb_info *c, const uint8_t *buf, | |
728 | size_t len) | |
1da177e4 | 729 | { |
dcb09328 TG |
730 | if (len && !c->wbuf_len && (len >= c->wbuf_pagesize)) |
731 | return 0; | |
732 | ||
733 | if (len > (c->wbuf_pagesize - c->wbuf_len)) | |
734 | len = c->wbuf_pagesize - c->wbuf_len; | |
735 | memcpy(c->wbuf + c->wbuf_len, buf, len); | |
736 | c->wbuf_len += (uint32_t) len; | |
737 | return len; | |
738 | } | |
739 | ||
740 | int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, | |
741 | unsigned long count, loff_t to, size_t *retlen, | |
742 | uint32_t ino) | |
743 | { | |
744 | struct jffs2_eraseblock *jeb; | |
745 | size_t wbuf_retlen, donelen = 0; | |
1da177e4 | 746 | uint32_t outvec_to = to; |
dcb09328 | 747 | int ret, invec; |
1da177e4 | 748 | |
dcb09328 | 749 | /* If not writebuffered flash, don't bother */ |
3be36675 | 750 | if (!jffs2_is_writebuffered(c)) |
1da177e4 | 751 | return jffs2_flash_direct_writev(c, invecs, count, to, retlen); |
182ec4ee | 752 | |
1da177e4 LT |
753 | down_write(&c->wbuf_sem); |
754 | ||
755 | /* If wbuf_ofs is not initialized, set it to target address */ | |
756 | if (c->wbuf_ofs == 0xFFFFFFFF) { | |
757 | c->wbuf_ofs = PAGE_DIV(to); | |
182ec4ee | 758 | c->wbuf_len = PAGE_MOD(to); |
1da177e4 LT |
759 | memset(c->wbuf,0xff,c->wbuf_pagesize); |
760 | } | |
761 | ||
dcb09328 TG |
762 | /* |
763 | * Sanity checks on target address. It's permitted to write | |
764 | * at PAD(c->wbuf_len+c->wbuf_ofs), and it's permitted to | |
765 | * write at the beginning of a new erase block. Anything else, | |
766 | * and you die. New block starts at xxx000c (0-b = block | |
767 | * header) | |
768 | */ | |
3be36675 | 769 | if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) { |
1da177e4 LT |
770 | /* It's a write to a new block */ |
771 | if (c->wbuf_len) { | |
dcb09328 TG |
772 | D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx " |
773 | "causes flush of wbuf at 0x%08x\n", | |
774 | (unsigned long)to, c->wbuf_ofs)); | |
1da177e4 | 775 | ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); |
dcb09328 TG |
776 | if (ret) |
777 | goto outerr; | |
1da177e4 LT |
778 | } |
779 | /* set pointer to new block */ | |
780 | c->wbuf_ofs = PAGE_DIV(to); | |
182ec4ee TG |
781 | c->wbuf_len = PAGE_MOD(to); |
782 | } | |
1da177e4 LT |
783 | |
784 | if (to != PAD(c->wbuf_ofs + c->wbuf_len)) { | |
785 | /* We're not writing immediately after the writebuffer. Bad. */ | |
dcb09328 TG |
786 | printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write " |
787 | "to %08lx\n", (unsigned long)to); | |
1da177e4 LT |
788 | if (c->wbuf_len) |
789 | printk(KERN_CRIT "wbuf was previously %08x-%08x\n", | |
dcb09328 | 790 | c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len); |
1da177e4 LT |
791 | BUG(); |
792 | } | |
793 | ||
dcb09328 TG |
794 | /* adjust alignment offset */ |
795 | if (c->wbuf_len != PAGE_MOD(to)) { | |
796 | c->wbuf_len = PAGE_MOD(to); | |
797 | /* take care of alignment to next page */ | |
798 | if (!c->wbuf_len) { | |
799 | c->wbuf_len = c->wbuf_pagesize; | |
800 | ret = __jffs2_flush_wbuf(c, NOPAD); | |
801 | if (ret) | |
802 | goto outerr; | |
1da177e4 LT |
803 | } |
804 | } | |
805 | ||
dcb09328 TG |
806 | for (invec = 0; invec < count; invec++) { |
807 | int vlen = invecs[invec].iov_len; | |
808 | uint8_t *v = invecs[invec].iov_base; | |
7f716cf3 | 809 | |
dcb09328 | 810 | wbuf_retlen = jffs2_fill_wbuf(c, v, vlen); |
7f716cf3 | 811 | |
dcb09328 TG |
812 | if (c->wbuf_len == c->wbuf_pagesize) { |
813 | ret = __jffs2_flush_wbuf(c, NOPAD); | |
814 | if (ret) | |
815 | goto outerr; | |
1da177e4 | 816 | } |
dcb09328 TG |
817 | vlen -= wbuf_retlen; |
818 | outvec_to += wbuf_retlen; | |
1da177e4 | 819 | donelen += wbuf_retlen; |
dcb09328 TG |
820 | v += wbuf_retlen; |
821 | ||
822 | if (vlen >= c->wbuf_pagesize) { | |
823 | ret = c->mtd->write(c->mtd, outvec_to, PAGE_DIV(vlen), | |
824 | &wbuf_retlen, v); | |
825 | if (ret < 0 || wbuf_retlen != PAGE_DIV(vlen)) | |
826 | goto outfile; | |
827 | ||
828 | vlen -= wbuf_retlen; | |
829 | outvec_to += wbuf_retlen; | |
830 | c->wbuf_ofs = outvec_to; | |
831 | donelen += wbuf_retlen; | |
832 | v += wbuf_retlen; | |
1da177e4 LT |
833 | } |
834 | ||
dcb09328 TG |
835 | wbuf_retlen = jffs2_fill_wbuf(c, v, vlen); |
836 | if (c->wbuf_len == c->wbuf_pagesize) { | |
837 | ret = __jffs2_flush_wbuf(c, NOPAD); | |
838 | if (ret) | |
839 | goto outerr; | |
840 | } | |
1da177e4 | 841 | |
dcb09328 TG |
842 | outvec_to += wbuf_retlen; |
843 | donelen += wbuf_retlen; | |
1da177e4 | 844 | } |
1da177e4 | 845 | |
dcb09328 TG |
846 | /* |
847 | * If there's a remainder in the wbuf and it's a non-GC write, | |
848 | * remember that the wbuf affects this ino | |
849 | */ | |
1da177e4 LT |
850 | *retlen = donelen; |
851 | ||
e631ddba FH |
852 | if (jffs2_sum_active()) { |
853 | int res = jffs2_sum_add_kvec(c, invecs, count, (uint32_t) to); | |
854 | if (res) | |
855 | return res; | |
856 | } | |
857 | ||
1da177e4 LT |
858 | if (c->wbuf_len && ino) |
859 | jffs2_wbuf_dirties_inode(c, ino); | |
860 | ||
861 | ret = 0; | |
dcb09328 TG |
862 | up_write(&c->wbuf_sem); |
863 | return ret; | |
864 | ||
865 | outfile: | |
866 | /* | |
867 | * At this point we have no problem, c->wbuf is empty. However | |
868 | * refile nextblock to avoid writing again to same address. | |
869 | */ | |
870 | ||
871 | spin_lock(&c->erase_completion_lock); | |
872 | ||
873 | jeb = &c->blocks[outvec_to / c->sector_size]; | |
874 | jffs2_block_refile(c, jeb, REFILE_ANYWAY); | |
875 | ||
876 | spin_unlock(&c->erase_completion_lock); | |
182ec4ee | 877 | |
dcb09328 TG |
878 | outerr: |
879 | *retlen = 0; | |
1da177e4 LT |
880 | up_write(&c->wbuf_sem); |
881 | return ret; | |
882 | } | |
883 | ||
884 | /* | |
885 | * This is the entry for flash write. | |
886 | * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev | |
887 | */ | |
9bfeb691 DW |
888 | int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, |
889 | size_t *retlen, const u_char *buf) | |
1da177e4 LT |
890 | { |
891 | struct kvec vecs[1]; | |
892 | ||
3be36675 | 893 | if (!jffs2_is_writebuffered(c)) |
e631ddba | 894 | return jffs2_flash_direct_write(c, ofs, len, retlen, buf); |
1da177e4 LT |
895 | |
896 | vecs[0].iov_base = (unsigned char *) buf; | |
897 | vecs[0].iov_len = len; | |
898 | return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0); | |
899 | } | |
900 | ||
901 | /* | |
902 | Handle readback from writebuffer and ECC failure return | |
903 | */ | |
904 | int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf) | |
905 | { | |
906 | loff_t orbf = 0, owbf = 0, lwbf = 0; | |
907 | int ret; | |
908 | ||
3be36675 | 909 | if (!jffs2_is_writebuffered(c)) |
1da177e4 LT |
910 | return c->mtd->read(c->mtd, ofs, len, retlen, buf); |
911 | ||
3be36675 | 912 | /* Read flash */ |
894214d1 | 913 | down_read(&c->wbuf_sem); |
9223a456 | 914 | ret = c->mtd->read(c->mtd, ofs, len, retlen, buf); |
3be36675 | 915 | |
9a1fcdfd TG |
916 | if ( (ret == -EBADMSG || ret == -EUCLEAN) && (*retlen == len) ) { |
917 | if (ret == -EBADMSG) | |
918 | printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx)" | |
919 | " returned ECC error\n", len, ofs); | |
182ec4ee | 920 | /* |
9a1fcdfd TG |
921 | * We have the raw data without ECC correction in the buffer, |
922 | * maybe we are lucky and all data or parts are correct. We | |
923 | * check the node. If data are corrupted node check will sort | |
924 | * it out. We keep this block, it will fail on write or erase | |
925 | * and the we mark it bad. Or should we do that now? But we | |
926 | * should give him a chance. Maybe we had a system crash or | |
927 | * power loss before the ecc write or a erase was completed. | |
3be36675 AV |
928 | * So we return success. :) |
929 | */ | |
9a1fcdfd | 930 | ret = 0; |
182ec4ee | 931 | } |
3be36675 | 932 | |
1da177e4 LT |
933 | /* if no writebuffer available or write buffer empty, return */ |
934 | if (!c->wbuf_pagesize || !c->wbuf_len) | |
894214d1 | 935 | goto exit; |
1da177e4 LT |
936 | |
937 | /* if we read in a different block, return */ | |
3be36675 | 938 | if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs)) |
894214d1 | 939 | goto exit; |
1da177e4 LT |
940 | |
941 | if (ofs >= c->wbuf_ofs) { | |
942 | owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */ | |
943 | if (owbf > c->wbuf_len) /* is read beyond write buffer ? */ | |
944 | goto exit; | |
945 | lwbf = c->wbuf_len - owbf; /* number of bytes to copy */ | |
182ec4ee | 946 | if (lwbf > len) |
1da177e4 | 947 | lwbf = len; |
182ec4ee | 948 | } else { |
1da177e4 LT |
949 | orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */ |
950 | if (orbf > len) /* is write beyond write buffer ? */ | |
951 | goto exit; | |
9a1fcdfd | 952 | lwbf = len - orbf; /* number of bytes to copy */ |
182ec4ee | 953 | if (lwbf > c->wbuf_len) |
1da177e4 | 954 | lwbf = c->wbuf_len; |
182ec4ee | 955 | } |
1da177e4 LT |
956 | if (lwbf > 0) |
957 | memcpy(buf+orbf,c->wbuf+owbf,lwbf); | |
958 | ||
959 | exit: | |
960 | up_read(&c->wbuf_sem); | |
961 | return ret; | |
962 | } | |
963 | ||
a7a6ace1 AB |
964 | #define NR_OOB_SCAN_PAGES 4 |
965 | ||
966 | /* For historical reasons we use only 12 bytes for OOB clean marker */ | |
967 | #define OOB_CM_SIZE 12 | |
968 | ||
969 | static const struct jffs2_unknown_node oob_cleanmarker = | |
970 | { | |
566865a2 DW |
971 | .magic = constant_cpu_to_je16(JFFS2_MAGIC_BITMASK), |
972 | .nodetype = constant_cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER), | |
973 | .totlen = constant_cpu_to_je32(8) | |
a7a6ace1 | 974 | }; |
8593fbc6 | 975 | |
1da177e4 | 976 | /* |
a7a6ace1 AB |
977 | * Check, if the out of band area is empty. This function knows about the clean |
978 | * marker and if it is present in OOB, treats the OOB as empty anyway. | |
1da177e4 | 979 | */ |
8593fbc6 TG |
980 | int jffs2_check_oob_empty(struct jffs2_sb_info *c, |
981 | struct jffs2_eraseblock *jeb, int mode) | |
1da177e4 | 982 | { |
a7a6ace1 AB |
983 | int i, ret; |
984 | int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); | |
8593fbc6 TG |
985 | struct mtd_oob_ops ops; |
986 | ||
a7a6ace1 AB |
987 | ops.mode = MTD_OOB_AUTO; |
988 | ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail; | |
8593fbc6 | 989 | ops.oobbuf = c->oobbuf; |
a7a6ace1 | 990 | ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; |
8593fbc6 | 991 | ops.datbuf = NULL; |
8593fbc6 TG |
992 | |
993 | ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops); | |
a7a6ace1 | 994 | if (ret || ops.oobretlen != ops.ooblen) { |
7be26bfb AM |
995 | printk(KERN_ERR "cannot read OOB for EB at %08x, requested %zd" |
996 | " bytes, read %zd bytes, error %d\n", | |
997 | jeb->offset, ops.ooblen, ops.oobretlen, ret); | |
a7a6ace1 AB |
998 | if (!ret) |
999 | ret = -EIO; | |
8593fbc6 | 1000 | return ret; |
1da177e4 | 1001 | } |
182ec4ee | 1002 | |
a7a6ace1 AB |
1003 | for(i = 0; i < ops.ooblen; i++) { |
1004 | if (mode && i < cmlen) | |
1005 | /* Yeah, we know about the cleanmarker */ | |
1da177e4 LT |
1006 | continue; |
1007 | ||
8593fbc6 TG |
1008 | if (ops.oobbuf[i] != 0xFF) { |
1009 | D2(printk(KERN_DEBUG "Found %02x at %x in OOB for " | |
1010 | "%08x\n", ops.oobbuf[i], i, jeb->offset)); | |
1011 | return 1; | |
1da177e4 LT |
1012 | } |
1013 | } | |
1014 | ||
8593fbc6 | 1015 | return 0; |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | /* | |
a7a6ace1 AB |
1019 | * Check for a valid cleanmarker. |
1020 | * Returns: 0 if a valid cleanmarker was found | |
1021 | * 1 if no cleanmarker was found | |
1022 | * negative error code if an error occurred | |
8593fbc6 | 1023 | */ |
a7a6ace1 AB |
1024 | int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, |
1025 | struct jffs2_eraseblock *jeb) | |
1da177e4 | 1026 | { |
8593fbc6 | 1027 | struct mtd_oob_ops ops; |
a7a6ace1 | 1028 | int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); |
1da177e4 | 1029 | |
a7a6ace1 AB |
1030 | ops.mode = MTD_OOB_AUTO; |
1031 | ops.ooblen = cmlen; | |
8593fbc6 | 1032 | ops.oobbuf = c->oobbuf; |
a7a6ace1 | 1033 | ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; |
8593fbc6 | 1034 | ops.datbuf = NULL; |
1da177e4 | 1035 | |
a7a6ace1 AB |
1036 | ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops); |
1037 | if (ret || ops.oobretlen != ops.ooblen) { | |
7be26bfb AM |
1038 | printk(KERN_ERR "cannot read OOB for EB at %08x, requested %zd" |
1039 | " bytes, read %zd bytes, error %d\n", | |
1040 | jeb->offset, ops.ooblen, ops.oobretlen, ret); | |
a7a6ace1 AB |
1041 | if (!ret) |
1042 | ret = -EIO; | |
8593fbc6 TG |
1043 | return ret; |
1044 | } | |
1da177e4 | 1045 | |
a7a6ace1 | 1046 | return !!memcmp(&oob_cleanmarker, c->oobbuf, cmlen); |
1da177e4 LT |
1047 | } |
1048 | ||
8593fbc6 TG |
1049 | int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, |
1050 | struct jffs2_eraseblock *jeb) | |
1da177e4 | 1051 | { |
a7a6ace1 | 1052 | int ret; |
8593fbc6 | 1053 | struct mtd_oob_ops ops; |
a7a6ace1 | 1054 | int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); |
1da177e4 | 1055 | |
a7a6ace1 AB |
1056 | ops.mode = MTD_OOB_AUTO; |
1057 | ops.ooblen = cmlen; | |
1058 | ops.oobbuf = (uint8_t *)&oob_cleanmarker; | |
1059 | ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; | |
8593fbc6 | 1060 | ops.datbuf = NULL; |
8593fbc6 TG |
1061 | |
1062 | ret = c->mtd->write_oob(c->mtd, jeb->offset, &ops); | |
a7a6ace1 | 1063 | if (ret || ops.oobretlen != ops.ooblen) { |
7be26bfb AM |
1064 | printk(KERN_ERR "cannot write OOB for EB at %08x, requested %zd" |
1065 | " bytes, read %zd bytes, error %d\n", | |
1066 | jeb->offset, ops.ooblen, ops.oobretlen, ret); | |
a7a6ace1 AB |
1067 | if (!ret) |
1068 | ret = -EIO; | |
1da177e4 LT |
1069 | return ret; |
1070 | } | |
a7a6ace1 | 1071 | |
1da177e4 LT |
1072 | return 0; |
1073 | } | |
1074 | ||
182ec4ee | 1075 | /* |
1da177e4 LT |
1076 | * On NAND we try to mark this block bad. If the block was erased more |
1077 | * than MAX_ERASE_FAILURES we mark it finaly bad. | |
1078 | * Don't care about failures. This block remains on the erase-pending | |
1079 | * or badblock list as long as nobody manipulates the flash with | |
1080 | * a bootloader or something like that. | |
1081 | */ | |
1082 | ||
1083 | int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset) | |
1084 | { | |
1085 | int ret; | |
1086 | ||
1087 | /* if the count is < max, we try to write the counter to the 2nd page oob area */ | |
1088 | if( ++jeb->bad_count < MAX_ERASE_FAILURES) | |
1089 | return 0; | |
1090 | ||
1091 | if (!c->mtd->block_markbad) | |
1092 | return 1; // What else can we do? | |
1093 | ||
0feba829 | 1094 | printk(KERN_WARNING "JFFS2: marking eraseblock at %08x\n as bad", bad_offset); |
1da177e4 | 1095 | ret = c->mtd->block_markbad(c->mtd, bad_offset); |
182ec4ee | 1096 | |
1da177e4 LT |
1097 | if (ret) { |
1098 | D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); | |
1099 | return ret; | |
1100 | } | |
1101 | return 1; | |
1102 | } | |
1103 | ||
a7a6ace1 | 1104 | int jffs2_nand_flash_setup(struct jffs2_sb_info *c) |
1da177e4 | 1105 | { |
5bd34c09 | 1106 | struct nand_ecclayout *oinfo = c->mtd->ecclayout; |
1da177e4 | 1107 | |
1da177e4 LT |
1108 | if (!c->mtd->oobsize) |
1109 | return 0; | |
182ec4ee | 1110 | |
1da177e4 LT |
1111 | /* Cleanmarker is out-of-band, so inline size zero */ |
1112 | c->cleanmarker_size = 0; | |
1113 | ||
a7a6ace1 AB |
1114 | if (!oinfo || oinfo->oobavail == 0) { |
1115 | printk(KERN_ERR "inconsistent device description\n"); | |
5bd34c09 TG |
1116 | return -EINVAL; |
1117 | } | |
182ec4ee | 1118 | |
a7a6ace1 | 1119 | D1(printk(KERN_DEBUG "JFFS2 using OOB on NAND\n")); |
5bd34c09 | 1120 | |
a7a6ace1 | 1121 | c->oobavail = oinfo->oobavail; |
1da177e4 LT |
1122 | |
1123 | /* Initialise write buffer */ | |
1124 | init_rwsem(&c->wbuf_sem); | |
28318776 | 1125 | c->wbuf_pagesize = c->mtd->writesize; |
1da177e4 | 1126 | c->wbuf_ofs = 0xFFFFFFFF; |
182ec4ee | 1127 | |
1da177e4 LT |
1128 | c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); |
1129 | if (!c->wbuf) | |
1130 | return -ENOMEM; | |
1131 | ||
a7a6ace1 AB |
1132 | c->oobbuf = kmalloc(NR_OOB_SCAN_PAGES * c->oobavail, GFP_KERNEL); |
1133 | if (!c->oobbuf) { | |
1da177e4 LT |
1134 | kfree(c->wbuf); |
1135 | return -ENOMEM; | |
1136 | } | |
a7a6ace1 AB |
1137 | |
1138 | return 0; | |
1da177e4 LT |
1139 | } |
1140 | ||
1141 | void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c) | |
1142 | { | |
1143 | kfree(c->wbuf); | |
8593fbc6 | 1144 | kfree(c->oobbuf); |
1da177e4 LT |
1145 | } |
1146 | ||
8f15fd55 AV |
1147 | int jffs2_dataflash_setup(struct jffs2_sb_info *c) { |
1148 | c->cleanmarker_size = 0; /* No cleanmarkers needed */ | |
182ec4ee | 1149 | |
8f15fd55 AV |
1150 | /* Initialize write buffer */ |
1151 | init_rwsem(&c->wbuf_sem); | |
8f15fd55 | 1152 | |
182ec4ee | 1153 | |
daba5cc4 | 1154 | c->wbuf_pagesize = c->mtd->erasesize; |
182ec4ee | 1155 | |
daba5cc4 AB |
1156 | /* Find a suitable c->sector_size |
1157 | * - Not too much sectors | |
1158 | * - Sectors have to be at least 4 K + some bytes | |
1159 | * - All known dataflashes have erase sizes of 528 or 1056 | |
1160 | * - we take at least 8 eraseblocks and want to have at least 8K size | |
1161 | * - The concatenation should be a power of 2 | |
1162 | */ | |
1163 | ||
1164 | c->sector_size = 8 * c->mtd->erasesize; | |
182ec4ee | 1165 | |
daba5cc4 AB |
1166 | while (c->sector_size < 8192) { |
1167 | c->sector_size *= 2; | |
1168 | } | |
182ec4ee | 1169 | |
daba5cc4 AB |
1170 | /* It may be necessary to adjust the flash size */ |
1171 | c->flash_size = c->mtd->size; | |
8f15fd55 | 1172 | |
daba5cc4 AB |
1173 | if ((c->flash_size % c->sector_size) != 0) { |
1174 | c->flash_size = (c->flash_size / c->sector_size) * c->sector_size; | |
1175 | printk(KERN_WARNING "JFFS2 flash size adjusted to %dKiB\n", c->flash_size); | |
1176 | }; | |
182ec4ee | 1177 | |
daba5cc4 | 1178 | c->wbuf_ofs = 0xFFFFFFFF; |
8f15fd55 AV |
1179 | c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); |
1180 | if (!c->wbuf) | |
1181 | return -ENOMEM; | |
1182 | ||
daba5cc4 | 1183 | printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size); |
8f15fd55 AV |
1184 | |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) { | |
1189 | kfree(c->wbuf); | |
1190 | } | |
8f15fd55 | 1191 | |
59da721a | 1192 | int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) { |
c8b229de JE |
1193 | /* Cleanmarker currently occupies whole programming regions, |
1194 | * either one or 2 for 8Byte STMicro flashes. */ | |
1195 | c->cleanmarker_size = max(16u, c->mtd->writesize); | |
59da721a NP |
1196 | |
1197 | /* Initialize write buffer */ | |
1198 | init_rwsem(&c->wbuf_sem); | |
28318776 | 1199 | c->wbuf_pagesize = c->mtd->writesize; |
59da721a NP |
1200 | c->wbuf_ofs = 0xFFFFFFFF; |
1201 | ||
1202 | c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); | |
1203 | if (!c->wbuf) | |
1204 | return -ENOMEM; | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) { | |
1210 | kfree(c->wbuf); | |
1211 | } |