Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 | 10 | */ |
c00c310e | 11 | |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/sched.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/mtd/mtd.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/crc32.h> | |
18 | #include <linux/compiler.h> | |
19 | #include "nodelist.h" | |
e631ddba FH |
20 | #include "summary.h" |
21 | #include "debug.h" | |
1da177e4 | 22 | |
3be36675 | 23 | #define DEFAULT_EMPTY_SCAN_SIZE 1024 |
1da177e4 | 24 | |
1da177e4 LT |
25 | #define noisy_printk(noise, args...) do { \ |
26 | if (*(noise)) { \ | |
27 | printk(KERN_NOTICE args); \ | |
28 | (*(noise))--; \ | |
29 | if (!(*(noise))) { \ | |
30 | printk(KERN_NOTICE "Further such events for this erase block will not be printed\n"); \ | |
31 | } \ | |
32 | } \ | |
33 | } while(0) | |
34 | ||
35 | static uint32_t pseudo_random; | |
36 | ||
37 | static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, | |
e631ddba | 38 | unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s); |
1da177e4 | 39 | |
182ec4ee | 40 | /* These helper functions _must_ increase ofs and also do the dirty/used space accounting. |
1da177e4 LT |
41 | * Returning an error will abort the mount - bad checksums etc. should just mark the space |
42 | * as dirty. | |
43 | */ | |
182ec4ee | 44 | static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 45 | struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s); |
1da177e4 | 46 | static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 47 | struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s); |
1da177e4 LT |
48 | |
49 | static inline int min_free(struct jffs2_sb_info *c) | |
50 | { | |
51 | uint32_t min = 2 * sizeof(struct jffs2_raw_inode); | |
2f82ce1e | 52 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
53 | if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize) |
54 | return c->wbuf_pagesize; | |
55 | #endif | |
56 | return min; | |
57 | ||
58 | } | |
3be36675 AV |
59 | |
60 | static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) { | |
61 | if (sector_size < DEFAULT_EMPTY_SCAN_SIZE) | |
62 | return sector_size; | |
63 | else | |
64 | return DEFAULT_EMPTY_SCAN_SIZE; | |
65 | } | |
66 | ||
25090a6b DW |
67 | static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) |
68 | { | |
a6a8bef7 DW |
69 | int ret; |
70 | ||
71 | if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1))) | |
72 | return ret; | |
73 | if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size))) | |
25090a6b DW |
74 | return ret; |
75 | /* Turned wasted size into dirty, since we apparently | |
76 | think it's recoverable now. */ | |
77 | jeb->dirty_size += jeb->wasted_size; | |
78 | c->dirty_size += jeb->wasted_size; | |
79 | c->wasted_size -= jeb->wasted_size; | |
80 | jeb->wasted_size = 0; | |
81 | if (VERYDIRTY(c, jeb->dirty_size)) { | |
82 | list_add(&jeb->list, &c->very_dirty_list); | |
83 | } else { | |
84 | list_add(&jeb->list, &c->dirty_list); | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | ||
1da177e4 LT |
89 | int jffs2_scan_medium(struct jffs2_sb_info *c) |
90 | { | |
91 | int i, ret; | |
92 | uint32_t empty_blocks = 0, bad_blocks = 0; | |
93 | unsigned char *flashbuf = NULL; | |
94 | uint32_t buf_size = 0; | |
e631ddba | 95 | struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ |
1da177e4 LT |
96 | #ifndef __ECOS |
97 | size_t pointlen; | |
98 | ||
99 | if (c->mtd->point) { | |
a98889f3 JH |
100 | ret = c->mtd->point(c->mtd, 0, c->mtd->size, &pointlen, |
101 | (void **)&flashbuf, NULL); | |
1da177e4 LT |
102 | if (!ret && pointlen < c->mtd->size) { |
103 | /* Don't muck about if it won't let us point to the whole flash */ | |
104 | D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen)); | |
a98889f3 | 105 | c->mtd->unpoint(c->mtd, 0, pointlen); |
1da177e4 LT |
106 | flashbuf = NULL; |
107 | } | |
108 | if (ret) | |
109 | D1(printk(KERN_DEBUG "MTD point failed %d\n", ret)); | |
110 | } | |
111 | #endif | |
112 | if (!flashbuf) { | |
113 | /* For NAND it's quicker to read a whole eraseblock at a time, | |
114 | apparently */ | |
115 | if (jffs2_cleanmarker_oob(c)) | |
116 | buf_size = c->sector_size; | |
117 | else | |
118 | buf_size = PAGE_SIZE; | |
119 | ||
120 | /* Respect kmalloc limitations */ | |
121 | if (buf_size > 128*1024) | |
122 | buf_size = 128*1024; | |
123 | ||
124 | D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size)); | |
125 | flashbuf = kmalloc(buf_size, GFP_KERNEL); | |
126 | if (!flashbuf) | |
127 | return -ENOMEM; | |
128 | } | |
129 | ||
e631ddba | 130 | if (jffs2_sum_active()) { |
3d375d9e | 131 | s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); |
e631ddba FH |
132 | if (!s) { |
133 | JFFS2_WARNING("Can't allocate memory for summary\n"); | |
48396413 DW |
134 | ret = -ENOMEM; |
135 | goto out; | |
e631ddba | 136 | } |
e631ddba FH |
137 | } |
138 | ||
1da177e4 LT |
139 | for (i=0; i<c->nr_blocks; i++) { |
140 | struct jffs2_eraseblock *jeb = &c->blocks[i]; | |
141 | ||
a2166b93 AB |
142 | cond_resched(); |
143 | ||
e631ddba FH |
144 | /* reset summary info for next eraseblock scan */ |
145 | jffs2_sum_reset_collected(s); | |
146 | ||
147 | ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), | |
148 | buf_size, s); | |
1da177e4 LT |
149 | |
150 | if (ret < 0) | |
151 | goto out; | |
152 | ||
e0c8e42f | 153 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
1da177e4 LT |
154 | |
155 | /* Now decide which list to put it on */ | |
156 | switch(ret) { | |
157 | case BLK_STATE_ALLFF: | |
182ec4ee TG |
158 | /* |
159 | * Empty block. Since we can't be sure it | |
1da177e4 LT |
160 | * was entirely erased, we just queue it for erase |
161 | * again. It will be marked as such when the erase | |
162 | * is complete. Meanwhile we still count it as empty | |
163 | * for later checks. | |
164 | */ | |
165 | empty_blocks++; | |
166 | list_add(&jeb->list, &c->erase_pending_list); | |
167 | c->nr_erasing_blocks++; | |
168 | break; | |
169 | ||
170 | case BLK_STATE_CLEANMARKER: | |
171 | /* Only a CLEANMARKER node is valid */ | |
172 | if (!jeb->dirty_size) { | |
173 | /* It's actually free */ | |
174 | list_add(&jeb->list, &c->free_list); | |
175 | c->nr_free_blocks++; | |
176 | } else { | |
177 | /* Dirt */ | |
178 | D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset)); | |
179 | list_add(&jeb->list, &c->erase_pending_list); | |
180 | c->nr_erasing_blocks++; | |
181 | } | |
182 | break; | |
183 | ||
184 | case BLK_STATE_CLEAN: | |
e631ddba FH |
185 | /* Full (or almost full) of clean data. Clean list */ |
186 | list_add(&jeb->list, &c->clean_list); | |
1da177e4 LT |
187 | break; |
188 | ||
189 | case BLK_STATE_PARTDIRTY: | |
e631ddba FH |
190 | /* Some data, but not full. Dirty list. */ |
191 | /* We want to remember the block with most free space | |
192 | and stick it in the 'nextblock' position to start writing to it. */ | |
193 | if (jeb->free_size > min_free(c) && | |
194 | (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { | |
195 | /* Better candidate for the next writes to go to */ | |
196 | if (c->nextblock) { | |
25090a6b DW |
197 | ret = file_dirty(c, c->nextblock); |
198 | if (ret) | |
a2ab0ce0 | 199 | goto out; |
e631ddba FH |
200 | /* deleting summary information of the old nextblock */ |
201 | jffs2_sum_reset_collected(c->summary); | |
1da177e4 | 202 | } |
25090a6b | 203 | /* update collected summary information for the current nextblock */ |
e631ddba FH |
204 | jffs2_sum_move_collected(c, s); |
205 | D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset)); | |
206 | c->nextblock = jeb; | |
207 | } else { | |
25090a6b DW |
208 | ret = file_dirty(c, jeb); |
209 | if (ret) | |
a2ab0ce0 | 210 | goto out; |
e631ddba | 211 | } |
1da177e4 LT |
212 | break; |
213 | ||
214 | case BLK_STATE_ALLDIRTY: | |
215 | /* Nothing valid - not even a clean marker. Needs erasing. */ | |
e631ddba | 216 | /* For now we just put it on the erasing list. We'll start the erases later */ |
1da177e4 | 217 | D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset)); |
e631ddba | 218 | list_add(&jeb->list, &c->erase_pending_list); |
1da177e4 LT |
219 | c->nr_erasing_blocks++; |
220 | break; | |
e631ddba | 221 | |
1da177e4 LT |
222 | case BLK_STATE_BADBLOCK: |
223 | D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset)); | |
e631ddba | 224 | list_add(&jeb->list, &c->bad_list); |
1da177e4 LT |
225 | c->bad_size += c->sector_size; |
226 | c->free_size -= c->sector_size; | |
227 | bad_blocks++; | |
228 | break; | |
229 | default: | |
230 | printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n"); | |
e631ddba | 231 | BUG(); |
1da177e4 LT |
232 | } |
233 | } | |
e631ddba | 234 | |
1da177e4 LT |
235 | /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */ |
236 | if (c->nextblock && (c->nextblock->dirty_size)) { | |
237 | c->nextblock->wasted_size += c->nextblock->dirty_size; | |
238 | c->wasted_size += c->nextblock->dirty_size; | |
239 | c->dirty_size -= c->nextblock->dirty_size; | |
240 | c->nextblock->dirty_size = 0; | |
241 | } | |
2f82ce1e | 242 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
e96fb230 | 243 | if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { |
182ec4ee | 244 | /* If we're going to start writing into a block which already |
1da177e4 LT |
245 | contains data, and the end of the data isn't page-aligned, |
246 | skip a little and align it. */ | |
247 | ||
daba5cc4 | 248 | uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; |
1da177e4 LT |
249 | |
250 | D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n", | |
251 | skip)); | |
046b8b98 | 252 | jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); |
f560928b | 253 | jffs2_scan_dirty_space(c, c->nextblock, skip); |
1da177e4 LT |
254 | } |
255 | #endif | |
256 | if (c->nr_erasing_blocks) { | |
182ec4ee | 257 | if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { |
1da177e4 LT |
258 | printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); |
259 | printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks); | |
260 | ret = -EIO; | |
261 | goto out; | |
262 | } | |
ae3b6ba0 DW |
263 | spin_lock(&c->erase_completion_lock); |
264 | jffs2_garbage_collect_trigger(c); | |
265 | spin_unlock(&c->erase_completion_lock); | |
1da177e4 LT |
266 | } |
267 | ret = 0; | |
268 | out: | |
269 | if (buf_size) | |
270 | kfree(flashbuf); | |
271 | #ifndef __ECOS | |
182ec4ee | 272 | else |
a98889f3 | 273 | c->mtd->unpoint(c->mtd, 0, c->mtd->size); |
1da177e4 | 274 | #endif |
5b5ffbc1 FM |
275 | if (s) |
276 | kfree(s); | |
277 | ||
1da177e4 LT |
278 | return ret; |
279 | } | |
280 | ||
c05d52c7 AB |
281 | static int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf, |
282 | uint32_t ofs, uint32_t len) | |
1da177e4 LT |
283 | { |
284 | int ret; | |
285 | size_t retlen; | |
286 | ||
287 | ret = jffs2_flash_read(c, ofs, len, &retlen, buf); | |
288 | if (ret) { | |
289 | D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret)); | |
290 | return ret; | |
291 | } | |
292 | if (retlen < len) { | |
293 | D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen)); | |
294 | return -EIO; | |
295 | } | |
1da177e4 LT |
296 | return 0; |
297 | } | |
298 | ||
e631ddba FH |
299 | int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) |
300 | { | |
301 | if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size | |
99988f7b | 302 | && (!jeb->first_node || !ref_next(jeb->first_node)) ) |
e631ddba FH |
303 | return BLK_STATE_CLEANMARKER; |
304 | ||
305 | /* move blocks with max 4 byte dirty space to cleanlist */ | |
306 | else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { | |
307 | c->dirty_size -= jeb->dirty_size; | |
308 | c->wasted_size += jeb->dirty_size; | |
309 | jeb->wasted_size += jeb->dirty_size; | |
310 | jeb->dirty_size = 0; | |
311 | return BLK_STATE_CLEAN; | |
312 | } else if (jeb->used_size || jeb->unchecked_size) | |
313 | return BLK_STATE_PARTDIRTY; | |
314 | else | |
315 | return BLK_STATE_ALLDIRTY; | |
316 | } | |
317 | ||
aa98d7cf KK |
318 | #ifdef CONFIG_JFFS2_FS_XATTR |
319 | static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, | |
320 | struct jffs2_raw_xattr *rx, uint32_t ofs, | |
321 | struct jffs2_summary *s) | |
322 | { | |
323 | struct jffs2_xattr_datum *xd; | |
c9f700f8 | 324 | uint32_t xid, version, totlen, crc; |
68270995 | 325 | int err; |
aa98d7cf KK |
326 | |
327 | crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); | |
328 | if (crc != je32_to_cpu(rx->node_crc)) { | |
c9f700f8 KK |
329 | JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
330 | ofs, je32_to_cpu(rx->node_crc), crc); | |
68270995 DW |
331 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) |
332 | return err; | |
aa98d7cf KK |
333 | return 0; |
334 | } | |
335 | ||
c9f700f8 KK |
336 | xid = je32_to_cpu(rx->xid); |
337 | version = je32_to_cpu(rx->version); | |
338 | ||
8a13695c KK |
339 | totlen = PAD(sizeof(struct jffs2_raw_xattr) |
340 | + rx->name_len + 1 + je16_to_cpu(rx->value_len)); | |
aa98d7cf KK |
341 | if (totlen != je32_to_cpu(rx->totlen)) { |
342 | JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", | |
343 | ofs, je32_to_cpu(rx->totlen), totlen); | |
68270995 DW |
344 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) |
345 | return err; | |
aa98d7cf KK |
346 | return 0; |
347 | } | |
348 | ||
c9f700f8 KK |
349 | xd = jffs2_setup_xattr_datum(c, xid, version); |
350 | if (IS_ERR(xd)) | |
aa98d7cf | 351 | return PTR_ERR(xd); |
aa98d7cf | 352 | |
c9f700f8 KK |
353 | if (xd->version > version) { |
354 | struct jffs2_raw_node_ref *raw | |
355 | = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL); | |
356 | raw->next_in_ino = xd->node->next_in_ino; | |
357 | xd->node->next_in_ino = raw; | |
358 | } else { | |
359 | xd->version = version; | |
360 | xd->xprefix = rx->xprefix; | |
361 | xd->name_len = rx->name_len; | |
362 | xd->value_len = je16_to_cpu(rx->value_len); | |
363 | xd->data_crc = je32_to_cpu(rx->data_crc); | |
364 | ||
365 | jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd); | |
366 | } | |
f1f9671b | 367 | |
aa98d7cf KK |
368 | if (jffs2_sum_active()) |
369 | jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset); | |
370 | dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n", | |
371 | ofs, xd->xid, xd->version); | |
372 | return 0; | |
373 | } | |
374 | ||
375 | static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, | |
376 | struct jffs2_raw_xref *rr, uint32_t ofs, | |
377 | struct jffs2_summary *s) | |
378 | { | |
379 | struct jffs2_xattr_ref *ref; | |
aa98d7cf | 380 | uint32_t crc; |
68270995 | 381 | int err; |
aa98d7cf KK |
382 | |
383 | crc = crc32(0, rr, sizeof(*rr) - 4); | |
384 | if (crc != je32_to_cpu(rr->node_crc)) { | |
c9f700f8 KK |
385 | JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
386 | ofs, je32_to_cpu(rr->node_crc), crc); | |
68270995 DW |
387 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) |
388 | return err; | |
aa98d7cf KK |
389 | return 0; |
390 | } | |
391 | ||
392 | if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { | |
89291a9d | 393 | JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n", |
aa98d7cf KK |
394 | ofs, je32_to_cpu(rr->totlen), |
395 | PAD(sizeof(struct jffs2_raw_xref))); | |
68270995 DW |
396 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) |
397 | return err; | |
aa98d7cf KK |
398 | return 0; |
399 | } | |
400 | ||
401 | ref = jffs2_alloc_xattr_ref(); | |
402 | if (!ref) | |
403 | return -ENOMEM; | |
404 | ||
aa98d7cf | 405 | /* BEFORE jffs2_build_xattr_subsystem() called, |
c9f700f8 | 406 | * and AFTER xattr_ref is marked as a dead xref, |
aa98d7cf KK |
407 | * ref->xid is used to store 32bit xid, xd is not used |
408 | * ref->ino is used to store 32bit inode-number, ic is not used | |
409 | * Thoes variables are declared as union, thus using those | |
8f2b6f49 | 410 | * are exclusive. In a similar way, ref->next is temporarily |
aa98d7cf KK |
411 | * used to chain all xattr_ref object. It's re-chained to |
412 | * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. | |
413 | */ | |
aa98d7cf KK |
414 | ref->ino = je32_to_cpu(rr->ino); |
415 | ref->xid = je32_to_cpu(rr->xid); | |
c9f700f8 KK |
416 | ref->xseqno = je32_to_cpu(rr->xseqno); |
417 | if (ref->xseqno > c->highest_xseqno) | |
418 | c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); | |
8f2b6f49 KK |
419 | ref->next = c->xref_temp; |
420 | c->xref_temp = ref; | |
aa98d7cf | 421 | |
c9f700f8 | 422 | jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref); |
f1f9671b | 423 | |
aa98d7cf KK |
424 | if (jffs2_sum_active()) |
425 | jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); | |
426 | dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", | |
427 | ofs, ref->xid, ref->ino); | |
428 | return 0; | |
429 | } | |
430 | #endif | |
431 | ||
9641b784 DW |
432 | /* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into |
433 | the flash, XIP-style */ | |
1da177e4 | 434 | static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
9641b784 | 435 | unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { |
1da177e4 LT |
436 | struct jffs2_unknown_node *node; |
437 | struct jffs2_unknown_node crcnode; | |
438 | uint32_t ofs, prevofs; | |
439 | uint32_t hdr_crc, buf_ofs, buf_len; | |
440 | int err; | |
441 | int noise = 0; | |
e631ddba FH |
442 | |
443 | ||
2f82ce1e | 444 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
445 | int cleanmarkerfound = 0; |
446 | #endif | |
447 | ||
448 | ofs = jeb->offset; | |
449 | prevofs = jeb->offset - 1; | |
450 | ||
451 | D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs)); | |
452 | ||
2f82ce1e | 453 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 454 | if (jffs2_cleanmarker_oob(c)) { |
a7a6ace1 AB |
455 | int ret; |
456 | ||
457 | if (c->mtd->block_isbad(c->mtd, jeb->offset)) | |
458 | return BLK_STATE_BADBLOCK; | |
459 | ||
460 | ret = jffs2_check_nand_cleanmarker(c, jeb); | |
1da177e4 | 461 | D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret)); |
a7a6ace1 | 462 | |
1da177e4 LT |
463 | /* Even if it's not found, we still scan to see |
464 | if the block is empty. We use this information | |
465 | to decide whether to erase it or not. */ | |
466 | switch (ret) { | |
467 | case 0: cleanmarkerfound = 1; break; | |
468 | case 1: break; | |
1da177e4 LT |
469 | default: return ret; |
470 | } | |
471 | } | |
472 | #endif | |
e631ddba FH |
473 | |
474 | if (jffs2_sum_active()) { | |
9641b784 DW |
475 | struct jffs2_sum_marker *sm; |
476 | void *sumptr = NULL; | |
477 | uint32_t sumlen; | |
478 | ||
479 | if (!buf_size) { | |
480 | /* XIP case. Just look, point at the summary if it's there */ | |
13ba42df | 481 | sm = (void *)buf + c->sector_size - sizeof(*sm); |
9641b784 DW |
482 | if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { |
483 | sumptr = buf + je32_to_cpu(sm->offset); | |
484 | sumlen = c->sector_size - je32_to_cpu(sm->offset); | |
485 | } | |
486 | } else { | |
487 | /* If NAND flash, read a whole page of it. Else just the end */ | |
488 | if (c->wbuf_pagesize) | |
489 | buf_len = c->wbuf_pagesize; | |
490 | else | |
491 | buf_len = sizeof(*sm); | |
492 | ||
493 | /* Read as much as we want into the _end_ of the preallocated buffer */ | |
494 | err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, | |
495 | jeb->offset + c->sector_size - buf_len, | |
496 | buf_len); | |
497 | if (err) | |
498 | return err; | |
499 | ||
500 | sm = (void *)buf + buf_size - sizeof(*sm); | |
501 | if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { | |
502 | sumlen = c->sector_size - je32_to_cpu(sm->offset); | |
503 | sumptr = buf + buf_size - sumlen; | |
504 | ||
505 | /* Now, make sure the summary itself is available */ | |
506 | if (sumlen > buf_size) { | |
507 | /* Need to kmalloc for this. */ | |
508 | sumptr = kmalloc(sumlen, GFP_KERNEL); | |
509 | if (!sumptr) | |
510 | return -ENOMEM; | |
511 | memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); | |
512 | } | |
513 | if (buf_len < sumlen) { | |
514 | /* Need to read more so that the entire summary node is present */ | |
515 | err = jffs2_fill_scan_buf(c, sumptr, | |
516 | jeb->offset + c->sector_size - sumlen, | |
517 | sumlen - buf_len); | |
518 | if (err) | |
519 | return err; | |
520 | } | |
521 | } | |
e631ddba | 522 | |
e631ddba FH |
523 | } |
524 | ||
9641b784 DW |
525 | if (sumptr) { |
526 | err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); | |
3560160a | 527 | |
9641b784 DW |
528 | if (buf_size && sumlen > buf_size) |
529 | kfree(sumptr); | |
3560160a DW |
530 | /* If it returns with a real error, bail. |
531 | If it returns positive, that's a block classification | |
532 | (i.e. BLK_STATE_xxx) so return that too. | |
533 | If it returns zero, fall through to full scan. */ | |
534 | if (err) | |
535 | return err; | |
e631ddba | 536 | } |
e631ddba FH |
537 | } |
538 | ||
1da177e4 LT |
539 | buf_ofs = jeb->offset; |
540 | ||
541 | if (!buf_size) { | |
9641b784 | 542 | /* This is the XIP case -- we're reading _directly_ from the flash chip */ |
1da177e4 LT |
543 | buf_len = c->sector_size; |
544 | } else { | |
3be36675 | 545 | buf_len = EMPTY_SCAN_SIZE(c->sector_size); |
1da177e4 LT |
546 | err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); |
547 | if (err) | |
548 | return err; | |
549 | } | |
182ec4ee | 550 | |
1da177e4 LT |
551 | /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ |
552 | ofs = 0; | |
553 | ||
554 | /* Scan only 4KiB of 0xFF before declaring it's empty */ | |
3be36675 | 555 | while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) |
1da177e4 LT |
556 | ofs += 4; |
557 | ||
3be36675 | 558 | if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) { |
2f82ce1e | 559 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
560 | if (jffs2_cleanmarker_oob(c)) { |
561 | /* scan oob, take care of cleanmarker */ | |
562 | int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); | |
563 | D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret)); | |
564 | switch (ret) { | |
565 | case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; | |
566 | case 1: return BLK_STATE_ALLDIRTY; | |
567 | default: return ret; | |
568 | } | |
569 | } | |
570 | #endif | |
571 | D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset)); | |
8f15fd55 AV |
572 | if (c->cleanmarker_size == 0) |
573 | return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ | |
574 | else | |
575 | return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ | |
1da177e4 LT |
576 | } |
577 | if (ofs) { | |
578 | D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset, | |
579 | jeb->offset + ofs)); | |
a6a8bef7 DW |
580 | if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1))) |
581 | return err; | |
68270995 DW |
582 | if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) |
583 | return err; | |
1da177e4 LT |
584 | } |
585 | ||
586 | /* Now ofs is a complete physical flash offset as it always was... */ | |
587 | ofs += jeb->offset; | |
588 | ||
589 | noise = 10; | |
590 | ||
733802d9 | 591 | dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); |
e631ddba | 592 | |
182ec4ee | 593 | scan_more: |
1da177e4 LT |
594 | while(ofs < jeb->offset + c->sector_size) { |
595 | ||
e0c8e42f | 596 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
1da177e4 | 597 | |
2f785402 | 598 | /* Make sure there are node refs available for use */ |
046b8b98 | 599 | err = jffs2_prealloc_raw_node_refs(c, jeb, 2); |
2f785402 DW |
600 | if (err) |
601 | return err; | |
602 | ||
1da177e4 LT |
603 | cond_resched(); |
604 | ||
605 | if (ofs & 3) { | |
606 | printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs); | |
607 | ofs = PAD(ofs); | |
608 | continue; | |
609 | } | |
610 | if (ofs == prevofs) { | |
611 | printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs); | |
68270995 DW |
612 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
613 | return err; | |
1da177e4 LT |
614 | ofs += 4; |
615 | continue; | |
616 | } | |
617 | prevofs = ofs; | |
618 | ||
619 | if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { | |
620 | D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node), | |
621 | jeb->offset, c->sector_size, ofs, sizeof(*node))); | |
68270995 DW |
622 | if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) |
623 | return err; | |
1da177e4 LT |
624 | break; |
625 | } | |
626 | ||
627 | if (buf_ofs + buf_len < ofs + sizeof(*node)) { | |
628 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
629 | D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", | |
630 | sizeof(struct jffs2_unknown_node), buf_len, ofs)); | |
631 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
632 | if (err) | |
633 | return err; | |
634 | buf_ofs = ofs; | |
635 | } | |
636 | ||
637 | node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; | |
638 | ||
639 | if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { | |
640 | uint32_t inbuf_ofs; | |
c2aecda7 | 641 | uint32_t empty_start, scan_end; |
1da177e4 LT |
642 | |
643 | empty_start = ofs; | |
644 | ofs += 4; | |
c2aecda7 | 645 | scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len); |
1da177e4 LT |
646 | |
647 | D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); | |
648 | more_empty: | |
649 | inbuf_ofs = ofs - buf_ofs; | |
c2aecda7 JT |
650 | while (inbuf_ofs < scan_end) { |
651 | if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) { | |
1da177e4 LT |
652 | printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", |
653 | empty_start, ofs); | |
68270995 DW |
654 | if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) |
655 | return err; | |
1da177e4 LT |
656 | goto scan_more; |
657 | } | |
658 | ||
659 | inbuf_ofs+=4; | |
660 | ofs += 4; | |
661 | } | |
662 | /* Ran off end. */ | |
663 | D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs)); | |
664 | ||
665 | /* If we're only checking the beginning of a block with a cleanmarker, | |
666 | bail now */ | |
182ec4ee | 667 | if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && |
99988f7b | 668 | c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) { |
3be36675 | 669 | D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); |
1da177e4 LT |
670 | return BLK_STATE_CLEANMARKER; |
671 | } | |
c2aecda7 JT |
672 | if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */ |
673 | scan_end = buf_len; | |
674 | goto more_empty; | |
675 | } | |
676 | ||
1da177e4 LT |
677 | /* See how much more there is to read in this eraseblock... */ |
678 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
679 | if (!buf_len) { | |
182ec4ee | 680 | /* No more to read. Break out of main loop without marking |
1da177e4 LT |
681 | this range of empty space as dirty (because it's not) */ |
682 | D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n", | |
683 | empty_start)); | |
684 | break; | |
685 | } | |
c2aecda7 JT |
686 | /* point never reaches here */ |
687 | scan_end = buf_len; | |
1da177e4 LT |
688 | D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); |
689 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
690 | if (err) | |
691 | return err; | |
692 | buf_ofs = ofs; | |
693 | goto more_empty; | |
694 | } | |
695 | ||
696 | if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { | |
697 | printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); | |
68270995 DW |
698 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
699 | return err; | |
1da177e4 LT |
700 | ofs += 4; |
701 | continue; | |
702 | } | |
703 | if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { | |
704 | D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs)); | |
68270995 DW |
705 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
706 | return err; | |
1da177e4 LT |
707 | ofs += 4; |
708 | continue; | |
709 | } | |
710 | if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { | |
711 | printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs); | |
712 | printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n"); | |
68270995 DW |
713 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
714 | return err; | |
1da177e4 LT |
715 | ofs += 4; |
716 | continue; | |
717 | } | |
718 | if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { | |
719 | /* OK. We're out of possibilities. Whinge and move on */ | |
182ec4ee TG |
720 | noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", |
721 | JFFS2_MAGIC_BITMASK, ofs, | |
1da177e4 | 722 | je16_to_cpu(node->magic)); |
68270995 DW |
723 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
724 | return err; | |
1da177e4 LT |
725 | ofs += 4; |
726 | continue; | |
727 | } | |
728 | /* We seem to have a node of sorts. Check the CRC */ | |
729 | crcnode.magic = node->magic; | |
730 | crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); | |
731 | crcnode.totlen = node->totlen; | |
732 | hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); | |
733 | ||
734 | if (hdr_crc != je32_to_cpu(node->hdr_crc)) { | |
735 | noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n", | |
736 | ofs, je16_to_cpu(node->magic), | |
182ec4ee | 737 | je16_to_cpu(node->nodetype), |
1da177e4 LT |
738 | je32_to_cpu(node->totlen), |
739 | je32_to_cpu(node->hdr_crc), | |
740 | hdr_crc); | |
68270995 DW |
741 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
742 | return err; | |
1da177e4 LT |
743 | ofs += 4; |
744 | continue; | |
745 | } | |
746 | ||
0dec4c8b | 747 | if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) { |
1da177e4 LT |
748 | /* Eep. Node goes over the end of the erase block. */ |
749 | printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", | |
750 | ofs, je32_to_cpu(node->totlen)); | |
751 | printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n"); | |
68270995 DW |
752 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
753 | return err; | |
1da177e4 LT |
754 | ofs += 4; |
755 | continue; | |
756 | } | |
757 | ||
758 | if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { | |
759 | /* Wheee. This is an obsoleted node */ | |
760 | D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs)); | |
68270995 DW |
761 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
762 | return err; | |
1da177e4 LT |
763 | ofs += PAD(je32_to_cpu(node->totlen)); |
764 | continue; | |
765 | } | |
766 | ||
767 | switch(je16_to_cpu(node->nodetype)) { | |
768 | case JFFS2_NODETYPE_INODE: | |
769 | if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { | |
770 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
771 | D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", | |
772 | sizeof(struct jffs2_raw_inode), buf_len, ofs)); | |
773 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
774 | if (err) | |
775 | return err; | |
776 | buf_ofs = ofs; | |
777 | node = (void *)buf; | |
778 | } | |
e631ddba | 779 | err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); |
1da177e4 LT |
780 | if (err) return err; |
781 | ofs += PAD(je32_to_cpu(node->totlen)); | |
782 | break; | |
182ec4ee | 783 | |
1da177e4 LT |
784 | case JFFS2_NODETYPE_DIRENT: |
785 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
786 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
787 | D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", | |
788 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
789 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
790 | if (err) | |
791 | return err; | |
792 | buf_ofs = ofs; | |
793 | node = (void *)buf; | |
794 | } | |
e631ddba | 795 | err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); |
1da177e4 LT |
796 | if (err) return err; |
797 | ofs += PAD(je32_to_cpu(node->totlen)); | |
798 | break; | |
799 | ||
aa98d7cf KK |
800 | #ifdef CONFIG_JFFS2_FS_XATTR |
801 | case JFFS2_NODETYPE_XATTR: | |
802 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
803 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
804 | D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)" | |
805 | " left to end of buf. Reading 0x%x at 0x%08x\n", | |
806 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
807 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
808 | if (err) | |
809 | return err; | |
810 | buf_ofs = ofs; | |
811 | node = (void *)buf; | |
812 | } | |
813 | err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); | |
814 | if (err) | |
815 | return err; | |
816 | ofs += PAD(je32_to_cpu(node->totlen)); | |
817 | break; | |
818 | case JFFS2_NODETYPE_XREF: | |
819 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
820 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
821 | D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)" | |
822 | " left to end of buf. Reading 0x%x at 0x%08x\n", | |
823 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
824 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
825 | if (err) | |
826 | return err; | |
827 | buf_ofs = ofs; | |
828 | node = (void *)buf; | |
829 | } | |
830 | err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); | |
831 | if (err) | |
832 | return err; | |
833 | ofs += PAD(je32_to_cpu(node->totlen)); | |
834 | break; | |
835 | #endif /* CONFIG_JFFS2_FS_XATTR */ | |
836 | ||
1da177e4 LT |
837 | case JFFS2_NODETYPE_CLEANMARKER: |
838 | D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs)); | |
839 | if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { | |
182ec4ee | 840 | printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", |
1da177e4 | 841 | ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); |
68270995 DW |
842 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) |
843 | return err; | |
1da177e4 LT |
844 | ofs += PAD(sizeof(struct jffs2_unknown_node)); |
845 | } else if (jeb->first_node) { | |
846 | printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); | |
68270995 DW |
847 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) |
848 | return err; | |
1da177e4 LT |
849 | ofs += PAD(sizeof(struct jffs2_unknown_node)); |
850 | } else { | |
2f785402 | 851 | jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL); |
f1f9671b | 852 | |
1da177e4 LT |
853 | ofs += PAD(c->cleanmarker_size); |
854 | } | |
855 | break; | |
856 | ||
857 | case JFFS2_NODETYPE_PADDING: | |
e631ddba FH |
858 | if (jffs2_sum_active()) |
859 | jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); | |
68270995 DW |
860 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
861 | return err; | |
1da177e4 LT |
862 | ofs += PAD(je32_to_cpu(node->totlen)); |
863 | break; | |
864 | ||
865 | default: | |
866 | switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { | |
867 | case JFFS2_FEATURE_ROCOMPAT: | |
868 | printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); | |
ef53cb02 | 869 | c->flags |= JFFS2_SB_FLAG_RO; |
1da177e4 LT |
870 | if (!(jffs2_is_readonly(c))) |
871 | return -EROFS; | |
68270995 DW |
872 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
873 | return err; | |
1da177e4 LT |
874 | ofs += PAD(je32_to_cpu(node->totlen)); |
875 | break; | |
876 | ||
877 | case JFFS2_FEATURE_INCOMPAT: | |
878 | printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); | |
879 | return -EINVAL; | |
880 | ||
881 | case JFFS2_FEATURE_RWCOMPAT_DELETE: | |
882 | D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); | |
68270995 DW |
883 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
884 | return err; | |
1da177e4 LT |
885 | ofs += PAD(je32_to_cpu(node->totlen)); |
886 | break; | |
887 | ||
6171586a | 888 | case JFFS2_FEATURE_RWCOMPAT_COPY: { |
1da177e4 | 889 | D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); |
6171586a | 890 | |
2f785402 | 891 | jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL); |
6171586a DW |
892 | |
893 | /* We can't summarise nodes we don't grok */ | |
894 | jffs2_sum_disable_collecting(s); | |
1da177e4 LT |
895 | ofs += PAD(je32_to_cpu(node->totlen)); |
896 | break; | |
6171586a | 897 | } |
1da177e4 LT |
898 | } |
899 | } | |
900 | } | |
901 | ||
e631ddba FH |
902 | if (jffs2_sum_active()) { |
903 | if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { | |
733802d9 | 904 | dbg_summary("There is not enough space for " |
e631ddba FH |
905 | "summary information, disabling for this jeb!\n"); |
906 | jffs2_sum_disable_collecting(s); | |
907 | } | |
908 | } | |
1da177e4 | 909 | |
8b9e9fe8 DW |
910 | D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n", |
911 | jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size)); | |
912 | ||
1da177e4 LT |
913 | /* mark_node_obsolete can add to wasted !! */ |
914 | if (jeb->wasted_size) { | |
915 | jeb->dirty_size += jeb->wasted_size; | |
916 | c->dirty_size += jeb->wasted_size; | |
917 | c->wasted_size -= jeb->wasted_size; | |
918 | jeb->wasted_size = 0; | |
919 | } | |
920 | ||
e631ddba | 921 | return jffs2_scan_classify_jeb(c, jeb); |
1da177e4 LT |
922 | } |
923 | ||
e631ddba | 924 | struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) |
1da177e4 LT |
925 | { |
926 | struct jffs2_inode_cache *ic; | |
927 | ||
928 | ic = jffs2_get_ino_cache(c, ino); | |
929 | if (ic) | |
930 | return ic; | |
931 | ||
932 | if (ino > c->highest_ino) | |
933 | c->highest_ino = ino; | |
934 | ||
935 | ic = jffs2_alloc_inode_cache(); | |
936 | if (!ic) { | |
937 | printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n"); | |
938 | return NULL; | |
939 | } | |
940 | memset(ic, 0, sizeof(*ic)); | |
941 | ||
942 | ic->ino = ino; | |
943 | ic->nodes = (void *)ic; | |
944 | jffs2_add_ino_cache(c, ic); | |
945 | if (ino == 1) | |
27c72b04 | 946 | ic->pino_nlink = 1; |
1da177e4 LT |
947 | return ic; |
948 | } | |
949 | ||
182ec4ee | 950 | static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 951 | struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) |
1da177e4 | 952 | { |
1da177e4 | 953 | struct jffs2_inode_cache *ic; |
53043002 | 954 | uint32_t crc, ino = je32_to_cpu(ri->ino); |
1da177e4 LT |
955 | |
956 | D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); | |
957 | ||
958 | /* We do very little here now. Just check the ino# to which we should attribute | |
182ec4ee | 959 | this node; we can do all the CRC checking etc. later. There's a tradeoff here -- |
1da177e4 LT |
960 | we used to scan the flash once only, reading everything we want from it into |
961 | memory, then building all our in-core data structures and freeing the extra | |
962 | information. Now we allow the first part of the mount to complete a lot quicker, | |
182ec4ee | 963 | but we have to go _back_ to the flash in order to finish the CRC checking, etc. |
1da177e4 LT |
964 | Which means that the _full_ amount of time to get to proper write mode with GC |
965 | operational may actually be _longer_ than before. Sucks to be me. */ | |
966 | ||
53043002 TG |
967 | /* Check the node CRC in any case. */ |
968 | crc = crc32(0, ri, sizeof(*ri)-8); | |
969 | if (crc != je32_to_cpu(ri->node_crc)) { | |
970 | printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on " | |
971 | "node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
972 | ofs, je32_to_cpu(ri->node_crc), crc); | |
973 | /* | |
974 | * We believe totlen because the CRC on the node | |
975 | * _header_ was OK, just the node itself failed. | |
976 | */ | |
977 | return jffs2_scan_dirty_space(c, jeb, | |
978 | PAD(je32_to_cpu(ri->totlen))); | |
979 | } | |
980 | ||
1da177e4 LT |
981 | ic = jffs2_get_ino_cache(c, ino); |
982 | if (!ic) { | |
1da177e4 | 983 | ic = jffs2_scan_make_ino_cache(c, ino); |
2f785402 | 984 | if (!ic) |
1da177e4 | 985 | return -ENOMEM; |
1da177e4 LT |
986 | } |
987 | ||
988 | /* Wheee. It worked */ | |
2f785402 | 989 | jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic); |
1da177e4 | 990 | |
182ec4ee | 991 | D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n", |
1da177e4 LT |
992 | je32_to_cpu(ri->ino), je32_to_cpu(ri->version), |
993 | je32_to_cpu(ri->offset), | |
994 | je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize))); | |
995 | ||
996 | pseudo_random += je32_to_cpu(ri->version); | |
997 | ||
e631ddba FH |
998 | if (jffs2_sum_active()) { |
999 | jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); | |
1000 | } | |
1001 | ||
1da177e4 LT |
1002 | return 0; |
1003 | } | |
1004 | ||
182ec4ee | 1005 | static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 1006 | struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) |
1da177e4 | 1007 | { |
1da177e4 LT |
1008 | struct jffs2_full_dirent *fd; |
1009 | struct jffs2_inode_cache *ic; | |
b534e70c | 1010 | uint32_t checkedlen; |
1da177e4 | 1011 | uint32_t crc; |
68270995 | 1012 | int err; |
1da177e4 LT |
1013 | |
1014 | D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs)); | |
1015 | ||
1016 | /* We don't get here unless the node is still valid, so we don't have to | |
1017 | mask in the ACCURATE bit any more. */ | |
1018 | crc = crc32(0, rd, sizeof(*rd)-8); | |
1019 | ||
1020 | if (crc != je32_to_cpu(rd->node_crc)) { | |
1021 | printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
1022 | ofs, je32_to_cpu(rd->node_crc), crc); | |
1023 | /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ | |
68270995 DW |
1024 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) |
1025 | return err; | |
1da177e4 LT |
1026 | return 0; |
1027 | } | |
1028 | ||
1029 | pseudo_random += je32_to_cpu(rd->version); | |
1030 | ||
b534e70c DW |
1031 | /* Should never happen. Did. (OLPC trac #4184)*/ |
1032 | checkedlen = strnlen(rd->name, rd->nsize); | |
1033 | if (checkedlen < rd->nsize) { | |
1034 | printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n", | |
1035 | ofs, checkedlen); | |
1036 | } | |
1037 | fd = jffs2_alloc_full_dirent(checkedlen+1); | |
1da177e4 LT |
1038 | if (!fd) { |
1039 | return -ENOMEM; | |
1040 | } | |
b534e70c DW |
1041 | memcpy(&fd->name, rd->name, checkedlen); |
1042 | fd->name[checkedlen] = 0; | |
1da177e4 LT |
1043 | |
1044 | crc = crc32(0, fd->name, rd->nsize); | |
1045 | if (crc != je32_to_cpu(rd->name_crc)) { | |
1046 | printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
182ec4ee | 1047 | ofs, je32_to_cpu(rd->name_crc), crc); |
1da177e4 LT |
1048 | D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino))); |
1049 | jffs2_free_full_dirent(fd); | |
1050 | /* FIXME: Why do we believe totlen? */ | |
1051 | /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ | |
68270995 DW |
1052 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) |
1053 | return err; | |
1da177e4 LT |
1054 | return 0; |
1055 | } | |
1da177e4 LT |
1056 | ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); |
1057 | if (!ic) { | |
1058 | jffs2_free_full_dirent(fd); | |
1da177e4 LT |
1059 | return -ENOMEM; |
1060 | } | |
182ec4ee | 1061 | |
43dfa07f DW |
1062 | fd->raw = jffs2_link_node_ref(c, jeb, ofs | dirent_node_state(rd), |
1063 | PAD(je32_to_cpu(rd->totlen)), ic); | |
1da177e4 | 1064 | |
1da177e4 LT |
1065 | fd->next = NULL; |
1066 | fd->version = je32_to_cpu(rd->version); | |
1067 | fd->ino = je32_to_cpu(rd->ino); | |
b534e70c | 1068 | fd->nhash = full_name_hash(fd->name, checkedlen); |
1da177e4 | 1069 | fd->type = rd->type; |
1da177e4 LT |
1070 | jffs2_add_fd_to_list(c, fd, &ic->scan_dents); |
1071 | ||
e631ddba FH |
1072 | if (jffs2_sum_active()) { |
1073 | jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); | |
1074 | } | |
1075 | ||
1da177e4 LT |
1076 | return 0; |
1077 | } | |
1078 | ||
1079 | static int count_list(struct list_head *l) | |
1080 | { | |
1081 | uint32_t count = 0; | |
1082 | struct list_head *tmp; | |
1083 | ||
1084 | list_for_each(tmp, l) { | |
1085 | count++; | |
1086 | } | |
1087 | return count; | |
1088 | } | |
1089 | ||
1090 | /* Note: This breaks if list_empty(head). I don't care. You | |
1091 | might, if you copy this code and use it elsewhere :) */ | |
1092 | static void rotate_list(struct list_head *head, uint32_t count) | |
1093 | { | |
1094 | struct list_head *n = head->next; | |
1095 | ||
1096 | list_del(head); | |
1097 | while(count--) { | |
1098 | n = n->next; | |
1099 | } | |
1100 | list_add(head, n); | |
1101 | } | |
1102 | ||
1103 | void jffs2_rotate_lists(struct jffs2_sb_info *c) | |
1104 | { | |
1105 | uint32_t x; | |
1106 | uint32_t rotateby; | |
1107 | ||
1108 | x = count_list(&c->clean_list); | |
1109 | if (x) { | |
1110 | rotateby = pseudo_random % x; | |
1da177e4 | 1111 | rotate_list((&c->clean_list), rotateby); |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | x = count_list(&c->very_dirty_list); | |
1115 | if (x) { | |
1116 | rotateby = pseudo_random % x; | |
1da177e4 | 1117 | rotate_list((&c->very_dirty_list), rotateby); |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | x = count_list(&c->dirty_list); | |
1121 | if (x) { | |
1122 | rotateby = pseudo_random % x; | |
1da177e4 | 1123 | rotate_list((&c->dirty_list), rotateby); |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | x = count_list(&c->erasable_list); | |
1127 | if (x) { | |
1128 | rotateby = pseudo_random % x; | |
1da177e4 | 1129 | rotate_list((&c->erasable_list), rotateby); |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | if (c->nr_erasing_blocks) { | |
1133 | rotateby = pseudo_random % c->nr_erasing_blocks; | |
1da177e4 | 1134 | rotate_list((&c->erase_pending_list), rotateby); |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | if (c->nr_free_blocks) { | |
1138 | rotateby = pseudo_random % c->nr_free_blocks; | |
1da177e4 | 1139 | rotate_list((&c->free_list), rotateby); |
1da177e4 LT |
1140 | } |
1141 | } |