Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
daba5cc4 | 10 | * $Id: scan.c,v 1.125 2005/09/30 13:59:13 dedekind Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mtd/mtd.h> | |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/crc32.h> | |
19 | #include <linux/compiler.h> | |
20 | #include "nodelist.h" | |
e631ddba FH |
21 | #include "summary.h" |
22 | #include "debug.h" | |
1da177e4 | 23 | |
3be36675 | 24 | #define DEFAULT_EMPTY_SCAN_SIZE 1024 |
1da177e4 | 25 | |
1da177e4 LT |
26 | #define noisy_printk(noise, args...) do { \ |
27 | if (*(noise)) { \ | |
28 | printk(KERN_NOTICE args); \ | |
29 | (*(noise))--; \ | |
30 | if (!(*(noise))) { \ | |
31 | printk(KERN_NOTICE "Further such events for this erase block will not be printed\n"); \ | |
32 | } \ | |
33 | } \ | |
34 | } while(0) | |
35 | ||
36 | static uint32_t pseudo_random; | |
37 | ||
38 | static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, | |
e631ddba | 39 | unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s); |
1da177e4 | 40 | |
182ec4ee | 41 | /* These helper functions _must_ increase ofs and also do the dirty/used space accounting. |
1da177e4 LT |
42 | * Returning an error will abort the mount - bad checksums etc. should just mark the space |
43 | * as dirty. | |
44 | */ | |
182ec4ee | 45 | static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 46 | struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s); |
1da177e4 | 47 | static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 48 | struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s); |
1da177e4 LT |
49 | |
50 | static inline int min_free(struct jffs2_sb_info *c) | |
51 | { | |
52 | uint32_t min = 2 * sizeof(struct jffs2_raw_inode); | |
2f82ce1e | 53 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
54 | if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize) |
55 | return c->wbuf_pagesize; | |
56 | #endif | |
57 | return min; | |
58 | ||
59 | } | |
3be36675 AV |
60 | |
61 | static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) { | |
62 | if (sector_size < DEFAULT_EMPTY_SCAN_SIZE) | |
63 | return sector_size; | |
64 | else | |
65 | return DEFAULT_EMPTY_SCAN_SIZE; | |
66 | } | |
67 | ||
25090a6b DW |
68 | static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) |
69 | { | |
70 | int ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size); | |
71 | if (ret) | |
72 | return ret; | |
73 | /* Turned wasted size into dirty, since we apparently | |
74 | think it's recoverable now. */ | |
75 | jeb->dirty_size += jeb->wasted_size; | |
76 | c->dirty_size += jeb->wasted_size; | |
77 | c->wasted_size -= jeb->wasted_size; | |
78 | jeb->wasted_size = 0; | |
79 | if (VERYDIRTY(c, jeb->dirty_size)) { | |
80 | list_add(&jeb->list, &c->very_dirty_list); | |
81 | } else { | |
82 | list_add(&jeb->list, &c->dirty_list); | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | ||
1da177e4 LT |
87 | int jffs2_scan_medium(struct jffs2_sb_info *c) |
88 | { | |
89 | int i, ret; | |
90 | uint32_t empty_blocks = 0, bad_blocks = 0; | |
91 | unsigned char *flashbuf = NULL; | |
92 | uint32_t buf_size = 0; | |
e631ddba | 93 | struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ |
1da177e4 LT |
94 | #ifndef __ECOS |
95 | size_t pointlen; | |
96 | ||
97 | if (c->mtd->point) { | |
98 | ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf); | |
99 | if (!ret && pointlen < c->mtd->size) { | |
100 | /* Don't muck about if it won't let us point to the whole flash */ | |
101 | D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen)); | |
102 | c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); | |
103 | flashbuf = NULL; | |
104 | } | |
105 | if (ret) | |
106 | D1(printk(KERN_DEBUG "MTD point failed %d\n", ret)); | |
107 | } | |
108 | #endif | |
109 | if (!flashbuf) { | |
110 | /* For NAND it's quicker to read a whole eraseblock at a time, | |
111 | apparently */ | |
112 | if (jffs2_cleanmarker_oob(c)) | |
113 | buf_size = c->sector_size; | |
114 | else | |
115 | buf_size = PAGE_SIZE; | |
116 | ||
117 | /* Respect kmalloc limitations */ | |
118 | if (buf_size > 128*1024) | |
119 | buf_size = 128*1024; | |
120 | ||
121 | D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size)); | |
122 | flashbuf = kmalloc(buf_size, GFP_KERNEL); | |
123 | if (!flashbuf) | |
124 | return -ENOMEM; | |
125 | } | |
126 | ||
e631ddba FH |
127 | if (jffs2_sum_active()) { |
128 | s = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL); | |
129 | if (!s) { | |
130 | JFFS2_WARNING("Can't allocate memory for summary\n"); | |
131 | return -ENOMEM; | |
132 | } | |
133 | memset(s, 0, sizeof(struct jffs2_summary)); | |
134 | } | |
135 | ||
1da177e4 LT |
136 | for (i=0; i<c->nr_blocks; i++) { |
137 | struct jffs2_eraseblock *jeb = &c->blocks[i]; | |
138 | ||
e631ddba FH |
139 | /* reset summary info for next eraseblock scan */ |
140 | jffs2_sum_reset_collected(s); | |
141 | ||
142 | ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), | |
143 | buf_size, s); | |
1da177e4 LT |
144 | |
145 | if (ret < 0) | |
146 | goto out; | |
147 | ||
e0c8e42f | 148 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
1da177e4 LT |
149 | |
150 | /* Now decide which list to put it on */ | |
151 | switch(ret) { | |
152 | case BLK_STATE_ALLFF: | |
182ec4ee TG |
153 | /* |
154 | * Empty block. Since we can't be sure it | |
1da177e4 LT |
155 | * was entirely erased, we just queue it for erase |
156 | * again. It will be marked as such when the erase | |
157 | * is complete. Meanwhile we still count it as empty | |
158 | * for later checks. | |
159 | */ | |
160 | empty_blocks++; | |
161 | list_add(&jeb->list, &c->erase_pending_list); | |
162 | c->nr_erasing_blocks++; | |
163 | break; | |
164 | ||
165 | case BLK_STATE_CLEANMARKER: | |
166 | /* Only a CLEANMARKER node is valid */ | |
167 | if (!jeb->dirty_size) { | |
168 | /* It's actually free */ | |
169 | list_add(&jeb->list, &c->free_list); | |
170 | c->nr_free_blocks++; | |
171 | } else { | |
172 | /* Dirt */ | |
173 | D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset)); | |
174 | list_add(&jeb->list, &c->erase_pending_list); | |
175 | c->nr_erasing_blocks++; | |
176 | } | |
177 | break; | |
178 | ||
179 | case BLK_STATE_CLEAN: | |
e631ddba FH |
180 | /* Full (or almost full) of clean data. Clean list */ |
181 | list_add(&jeb->list, &c->clean_list); | |
1da177e4 LT |
182 | break; |
183 | ||
184 | case BLK_STATE_PARTDIRTY: | |
e631ddba FH |
185 | /* Some data, but not full. Dirty list. */ |
186 | /* We want to remember the block with most free space | |
187 | and stick it in the 'nextblock' position to start writing to it. */ | |
188 | if (jeb->free_size > min_free(c) && | |
189 | (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { | |
190 | /* Better candidate for the next writes to go to */ | |
191 | if (c->nextblock) { | |
25090a6b DW |
192 | ret = file_dirty(c, c->nextblock); |
193 | if (ret) | |
194 | return ret; | |
e631ddba FH |
195 | /* deleting summary information of the old nextblock */ |
196 | jffs2_sum_reset_collected(c->summary); | |
1da177e4 | 197 | } |
25090a6b | 198 | /* update collected summary information for the current nextblock */ |
e631ddba FH |
199 | jffs2_sum_move_collected(c, s); |
200 | D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset)); | |
201 | c->nextblock = jeb; | |
202 | } else { | |
25090a6b DW |
203 | ret = file_dirty(c, jeb); |
204 | if (ret) | |
205 | return ret; | |
e631ddba | 206 | } |
1da177e4 LT |
207 | break; |
208 | ||
209 | case BLK_STATE_ALLDIRTY: | |
210 | /* Nothing valid - not even a clean marker. Needs erasing. */ | |
e631ddba | 211 | /* For now we just put it on the erasing list. We'll start the erases later */ |
1da177e4 | 212 | D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset)); |
e631ddba | 213 | list_add(&jeb->list, &c->erase_pending_list); |
1da177e4 LT |
214 | c->nr_erasing_blocks++; |
215 | break; | |
e631ddba | 216 | |
1da177e4 LT |
217 | case BLK_STATE_BADBLOCK: |
218 | D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset)); | |
e631ddba | 219 | list_add(&jeb->list, &c->bad_list); |
1da177e4 LT |
220 | c->bad_size += c->sector_size; |
221 | c->free_size -= c->sector_size; | |
222 | bad_blocks++; | |
223 | break; | |
224 | default: | |
225 | printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n"); | |
e631ddba | 226 | BUG(); |
1da177e4 LT |
227 | } |
228 | } | |
e631ddba | 229 | |
1da177e4 LT |
230 | /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */ |
231 | if (c->nextblock && (c->nextblock->dirty_size)) { | |
232 | c->nextblock->wasted_size += c->nextblock->dirty_size; | |
233 | c->wasted_size += c->nextblock->dirty_size; | |
234 | c->dirty_size -= c->nextblock->dirty_size; | |
235 | c->nextblock->dirty_size = 0; | |
236 | } | |
2f82ce1e | 237 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
e96fb230 | 238 | if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { |
182ec4ee | 239 | /* If we're going to start writing into a block which already |
1da177e4 LT |
240 | contains data, and the end of the data isn't page-aligned, |
241 | skip a little and align it. */ | |
242 | ||
daba5cc4 | 243 | uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; |
1da177e4 LT |
244 | |
245 | D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n", | |
246 | skip)); | |
247 | c->nextblock->wasted_size += skip; | |
248 | c->wasted_size += skip; | |
249 | ||
250 | c->nextblock->free_size -= skip; | |
251 | c->free_size -= skip; | |
252 | } | |
253 | #endif | |
254 | if (c->nr_erasing_blocks) { | |
182ec4ee | 255 | if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { |
1da177e4 LT |
256 | printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); |
257 | printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks); | |
258 | ret = -EIO; | |
259 | goto out; | |
260 | } | |
261 | jffs2_erase_pending_trigger(c); | |
262 | } | |
263 | ret = 0; | |
264 | out: | |
265 | if (buf_size) | |
266 | kfree(flashbuf); | |
267 | #ifndef __ECOS | |
182ec4ee | 268 | else |
1da177e4 LT |
269 | c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); |
270 | #endif | |
5b5ffbc1 FM |
271 | if (s) |
272 | kfree(s); | |
273 | ||
1da177e4 LT |
274 | return ret; |
275 | } | |
276 | ||
e631ddba | 277 | int jffs2_fill_scan_buf (struct jffs2_sb_info *c, void *buf, |
1da177e4 LT |
278 | uint32_t ofs, uint32_t len) |
279 | { | |
280 | int ret; | |
281 | size_t retlen; | |
282 | ||
283 | ret = jffs2_flash_read(c, ofs, len, &retlen, buf); | |
284 | if (ret) { | |
285 | D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret)); | |
286 | return ret; | |
287 | } | |
288 | if (retlen < len) { | |
289 | D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen)); | |
290 | return -EIO; | |
291 | } | |
1da177e4 LT |
292 | return 0; |
293 | } | |
294 | ||
e631ddba FH |
295 | int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) |
296 | { | |
297 | if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size | |
298 | && (!jeb->first_node || !jeb->first_node->next_phys) ) | |
299 | return BLK_STATE_CLEANMARKER; | |
300 | ||
301 | /* move blocks with max 4 byte dirty space to cleanlist */ | |
302 | else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { | |
303 | c->dirty_size -= jeb->dirty_size; | |
304 | c->wasted_size += jeb->dirty_size; | |
305 | jeb->wasted_size += jeb->dirty_size; | |
306 | jeb->dirty_size = 0; | |
307 | return BLK_STATE_CLEAN; | |
308 | } else if (jeb->used_size || jeb->unchecked_size) | |
309 | return BLK_STATE_PARTDIRTY; | |
310 | else | |
311 | return BLK_STATE_ALLDIRTY; | |
312 | } | |
313 | ||
aa98d7cf KK |
314 | #ifdef CONFIG_JFFS2_FS_XATTR |
315 | static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, | |
316 | struct jffs2_raw_xattr *rx, uint32_t ofs, | |
317 | struct jffs2_summary *s) | |
318 | { | |
319 | struct jffs2_xattr_datum *xd; | |
320 | struct jffs2_raw_node_ref *raw; | |
321 | uint32_t totlen, crc; | |
68270995 | 322 | int err; |
aa98d7cf KK |
323 | |
324 | crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); | |
325 | if (crc != je32_to_cpu(rx->node_crc)) { | |
326 | if (je32_to_cpu(rx->node_crc) != 0xffffffff) | |
327 | JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", | |
328 | ofs, je32_to_cpu(rx->node_crc), crc); | |
68270995 DW |
329 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) |
330 | return err; | |
aa98d7cf KK |
331 | return 0; |
332 | } | |
333 | ||
334 | totlen = PAD(sizeof(*rx) + rx->name_len + 1 + je16_to_cpu(rx->value_len)); | |
335 | if (totlen != je32_to_cpu(rx->totlen)) { | |
336 | JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", | |
337 | ofs, je32_to_cpu(rx->totlen), totlen); | |
68270995 DW |
338 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) |
339 | return err; | |
aa98d7cf KK |
340 | return 0; |
341 | } | |
342 | ||
343 | raw = jffs2_alloc_raw_node_ref(); | |
344 | if (!raw) | |
345 | return -ENOMEM; | |
346 | ||
347 | xd = jffs2_setup_xattr_datum(c, je32_to_cpu(rx->xid), je32_to_cpu(rx->version)); | |
348 | if (IS_ERR(xd)) { | |
349 | jffs2_free_raw_node_ref(raw); | |
350 | if (PTR_ERR(xd) == -EEXIST) { | |
68270995 DW |
351 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rx->totlen))))) |
352 | return err; | |
aa98d7cf KK |
353 | return 0; |
354 | } | |
355 | return PTR_ERR(xd); | |
356 | } | |
357 | xd->xprefix = rx->xprefix; | |
358 | xd->name_len = rx->name_len; | |
359 | xd->value_len = je16_to_cpu(rx->value_len); | |
360 | xd->data_crc = je32_to_cpu(rx->data_crc); | |
361 | xd->node = raw; | |
362 | ||
aa98d7cf | 363 | raw->flash_offset = ofs | REF_PRISTINE; |
aa98d7cf | 364 | |
fcb75787 DW |
365 | jffs2_link_node_ref(c, jeb, raw, totlen, NULL); |
366 | /* FIXME */ raw->next_in_ino = (void *)xd; | |
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; | |
380 | struct jffs2_raw_node_ref *raw; | |
381 | uint32_t crc; | |
68270995 | 382 | int err; |
aa98d7cf KK |
383 | |
384 | crc = crc32(0, rr, sizeof(*rr) - 4); | |
385 | if (crc != je32_to_cpu(rr->node_crc)) { | |
386 | if (je32_to_cpu(rr->node_crc) != 0xffffffff) | |
387 | JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", | |
388 | ofs, je32_to_cpu(rr->node_crc), crc); | |
68270995 DW |
389 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) |
390 | return err; | |
aa98d7cf KK |
391 | return 0; |
392 | } | |
393 | ||
394 | if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { | |
395 | JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", | |
396 | ofs, je32_to_cpu(rr->totlen), | |
397 | PAD(sizeof(struct jffs2_raw_xref))); | |
68270995 DW |
398 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) |
399 | return err; | |
aa98d7cf KK |
400 | return 0; |
401 | } | |
402 | ||
403 | ref = jffs2_alloc_xattr_ref(); | |
404 | if (!ref) | |
405 | return -ENOMEM; | |
406 | ||
407 | raw = jffs2_alloc_raw_node_ref(); | |
408 | if (!raw) { | |
409 | jffs2_free_xattr_ref(ref); | |
410 | return -ENOMEM; | |
411 | } | |
412 | ||
413 | /* BEFORE jffs2_build_xattr_subsystem() called, | |
414 | * ref->xid is used to store 32bit xid, xd is not used | |
415 | * ref->ino is used to store 32bit inode-number, ic is not used | |
416 | * Thoes variables are declared as union, thus using those | |
8f2b6f49 | 417 | * are exclusive. In a similar way, ref->next is temporarily |
aa98d7cf KK |
418 | * used to chain all xattr_ref object. It's re-chained to |
419 | * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. | |
420 | */ | |
421 | ref->node = raw; | |
422 | ref->ino = je32_to_cpu(rr->ino); | |
423 | ref->xid = je32_to_cpu(rr->xid); | |
8f2b6f49 KK |
424 | ref->next = c->xref_temp; |
425 | c->xref_temp = ref; | |
aa98d7cf | 426 | |
aa98d7cf | 427 | raw->flash_offset = ofs | REF_PRISTINE; |
aa98d7cf | 428 | |
fcb75787 DW |
429 | jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(rr->totlen)), NULL); |
430 | /* FIXME */ raw->next_in_ino = (void *)ref; | |
f1f9671b | 431 | |
aa98d7cf KK |
432 | if (jffs2_sum_active()) |
433 | jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); | |
434 | dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", | |
435 | ofs, ref->xid, ref->ino); | |
436 | return 0; | |
437 | } | |
438 | #endif | |
439 | ||
9641b784 DW |
440 | /* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into |
441 | the flash, XIP-style */ | |
1da177e4 | 442 | static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
9641b784 | 443 | unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { |
1da177e4 LT |
444 | struct jffs2_unknown_node *node; |
445 | struct jffs2_unknown_node crcnode; | |
446 | uint32_t ofs, prevofs; | |
447 | uint32_t hdr_crc, buf_ofs, buf_len; | |
448 | int err; | |
449 | int noise = 0; | |
e631ddba FH |
450 | |
451 | ||
2f82ce1e | 452 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
453 | int cleanmarkerfound = 0; |
454 | #endif | |
455 | ||
456 | ofs = jeb->offset; | |
457 | prevofs = jeb->offset - 1; | |
458 | ||
459 | D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs)); | |
460 | ||
2f82ce1e | 461 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
462 | if (jffs2_cleanmarker_oob(c)) { |
463 | int ret = jffs2_check_nand_cleanmarker(c, jeb); | |
464 | D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret)); | |
465 | /* Even if it's not found, we still scan to see | |
466 | if the block is empty. We use this information | |
467 | to decide whether to erase it or not. */ | |
468 | switch (ret) { | |
469 | case 0: cleanmarkerfound = 1; break; | |
470 | case 1: break; | |
471 | case 2: return BLK_STATE_BADBLOCK; | |
472 | case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */ | |
473 | default: return ret; | |
474 | } | |
475 | } | |
476 | #endif | |
e631ddba FH |
477 | |
478 | if (jffs2_sum_active()) { | |
9641b784 DW |
479 | struct jffs2_sum_marker *sm; |
480 | void *sumptr = NULL; | |
481 | uint32_t sumlen; | |
482 | ||
483 | if (!buf_size) { | |
484 | /* XIP case. Just look, point at the summary if it's there */ | |
485 | sm = (void *)buf + jeb->offset - sizeof(*sm); | |
486 | if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { | |
487 | sumptr = buf + je32_to_cpu(sm->offset); | |
488 | sumlen = c->sector_size - je32_to_cpu(sm->offset); | |
489 | } | |
490 | } else { | |
491 | /* If NAND flash, read a whole page of it. Else just the end */ | |
492 | if (c->wbuf_pagesize) | |
493 | buf_len = c->wbuf_pagesize; | |
494 | else | |
495 | buf_len = sizeof(*sm); | |
496 | ||
497 | /* Read as much as we want into the _end_ of the preallocated buffer */ | |
498 | err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, | |
499 | jeb->offset + c->sector_size - buf_len, | |
500 | buf_len); | |
501 | if (err) | |
502 | return err; | |
503 | ||
504 | sm = (void *)buf + buf_size - sizeof(*sm); | |
505 | if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { | |
506 | sumlen = c->sector_size - je32_to_cpu(sm->offset); | |
507 | sumptr = buf + buf_size - sumlen; | |
508 | ||
509 | /* Now, make sure the summary itself is available */ | |
510 | if (sumlen > buf_size) { | |
511 | /* Need to kmalloc for this. */ | |
512 | sumptr = kmalloc(sumlen, GFP_KERNEL); | |
513 | if (!sumptr) | |
514 | return -ENOMEM; | |
515 | memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); | |
516 | } | |
517 | if (buf_len < sumlen) { | |
518 | /* Need to read more so that the entire summary node is present */ | |
519 | err = jffs2_fill_scan_buf(c, sumptr, | |
520 | jeb->offset + c->sector_size - sumlen, | |
521 | sumlen - buf_len); | |
522 | if (err) | |
523 | return err; | |
524 | } | |
525 | } | |
e631ddba | 526 | |
e631ddba FH |
527 | } |
528 | ||
9641b784 DW |
529 | if (sumptr) { |
530 | err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); | |
3560160a | 531 | |
9641b784 DW |
532 | if (buf_size && sumlen > buf_size) |
533 | kfree(sumptr); | |
3560160a DW |
534 | /* If it returns with a real error, bail. |
535 | If it returns positive, that's a block classification | |
536 | (i.e. BLK_STATE_xxx) so return that too. | |
537 | If it returns zero, fall through to full scan. */ | |
538 | if (err) | |
539 | return err; | |
e631ddba | 540 | } |
e631ddba FH |
541 | } |
542 | ||
1da177e4 LT |
543 | buf_ofs = jeb->offset; |
544 | ||
545 | if (!buf_size) { | |
9641b784 | 546 | /* This is the XIP case -- we're reading _directly_ from the flash chip */ |
1da177e4 LT |
547 | buf_len = c->sector_size; |
548 | } else { | |
3be36675 | 549 | buf_len = EMPTY_SCAN_SIZE(c->sector_size); |
1da177e4 LT |
550 | err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); |
551 | if (err) | |
552 | return err; | |
553 | } | |
182ec4ee | 554 | |
1da177e4 LT |
555 | /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ |
556 | ofs = 0; | |
557 | ||
558 | /* Scan only 4KiB of 0xFF before declaring it's empty */ | |
3be36675 | 559 | while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) |
1da177e4 LT |
560 | ofs += 4; |
561 | ||
3be36675 | 562 | if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) { |
2f82ce1e | 563 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
564 | if (jffs2_cleanmarker_oob(c)) { |
565 | /* scan oob, take care of cleanmarker */ | |
566 | int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); | |
567 | D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret)); | |
568 | switch (ret) { | |
569 | case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; | |
570 | case 1: return BLK_STATE_ALLDIRTY; | |
571 | default: return ret; | |
572 | } | |
573 | } | |
574 | #endif | |
575 | D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset)); | |
8f15fd55 AV |
576 | if (c->cleanmarker_size == 0) |
577 | return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ | |
578 | else | |
579 | return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ | |
1da177e4 LT |
580 | } |
581 | if (ofs) { | |
582 | D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset, | |
583 | jeb->offset + ofs)); | |
68270995 DW |
584 | if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) |
585 | return err; | |
1da177e4 LT |
586 | } |
587 | ||
588 | /* Now ofs is a complete physical flash offset as it always was... */ | |
589 | ofs += jeb->offset; | |
590 | ||
591 | noise = 10; | |
592 | ||
733802d9 | 593 | dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); |
e631ddba | 594 | |
182ec4ee | 595 | scan_more: |
1da177e4 LT |
596 | while(ofs < jeb->offset + c->sector_size) { |
597 | ||
e0c8e42f | 598 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
1da177e4 LT |
599 | |
600 | cond_resched(); | |
601 | ||
602 | if (ofs & 3) { | |
603 | printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs); | |
604 | ofs = PAD(ofs); | |
605 | continue; | |
606 | } | |
607 | if (ofs == prevofs) { | |
608 | printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs); | |
68270995 DW |
609 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
610 | return err; | |
1da177e4 LT |
611 | ofs += 4; |
612 | continue; | |
613 | } | |
614 | prevofs = ofs; | |
615 | ||
616 | if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { | |
617 | 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), | |
618 | jeb->offset, c->sector_size, ofs, sizeof(*node))); | |
68270995 DW |
619 | if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) |
620 | return err; | |
1da177e4 LT |
621 | break; |
622 | } | |
623 | ||
624 | if (buf_ofs + buf_len < ofs + sizeof(*node)) { | |
625 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
626 | D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", | |
627 | sizeof(struct jffs2_unknown_node), buf_len, ofs)); | |
628 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
629 | if (err) | |
630 | return err; | |
631 | buf_ofs = ofs; | |
632 | } | |
633 | ||
634 | node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; | |
635 | ||
636 | if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { | |
637 | uint32_t inbuf_ofs; | |
638 | uint32_t empty_start; | |
639 | ||
640 | empty_start = ofs; | |
641 | ofs += 4; | |
642 | ||
643 | D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); | |
644 | more_empty: | |
645 | inbuf_ofs = ofs - buf_ofs; | |
646 | while (inbuf_ofs < buf_len) { | |
647 | if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff) { | |
648 | printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", | |
649 | empty_start, ofs); | |
68270995 DW |
650 | if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) |
651 | return err; | |
1da177e4 LT |
652 | goto scan_more; |
653 | } | |
654 | ||
655 | inbuf_ofs+=4; | |
656 | ofs += 4; | |
657 | } | |
658 | /* Ran off end. */ | |
659 | D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs)); | |
660 | ||
661 | /* If we're only checking the beginning of a block with a cleanmarker, | |
662 | bail now */ | |
182ec4ee | 663 | if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && |
b81226c5 | 664 | c->cleanmarker_size && !jeb->dirty_size && !jeb->first_node->next_phys) { |
3be36675 | 665 | D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); |
1da177e4 LT |
666 | return BLK_STATE_CLEANMARKER; |
667 | } | |
668 | ||
669 | /* See how much more there is to read in this eraseblock... */ | |
670 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
671 | if (!buf_len) { | |
182ec4ee | 672 | /* No more to read. Break out of main loop without marking |
1da177e4 LT |
673 | this range of empty space as dirty (because it's not) */ |
674 | D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n", | |
675 | empty_start)); | |
676 | break; | |
677 | } | |
678 | D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); | |
679 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
680 | if (err) | |
681 | return err; | |
682 | buf_ofs = ofs; | |
683 | goto more_empty; | |
684 | } | |
685 | ||
686 | if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { | |
687 | printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); | |
68270995 DW |
688 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
689 | return err; | |
1da177e4 LT |
690 | ofs += 4; |
691 | continue; | |
692 | } | |
693 | if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { | |
694 | D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs)); | |
68270995 DW |
695 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
696 | return err; | |
1da177e4 LT |
697 | ofs += 4; |
698 | continue; | |
699 | } | |
700 | if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { | |
701 | printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs); | |
702 | printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n"); | |
68270995 DW |
703 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
704 | return err; | |
1da177e4 LT |
705 | ofs += 4; |
706 | continue; | |
707 | } | |
708 | if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { | |
709 | /* OK. We're out of possibilities. Whinge and move on */ | |
182ec4ee TG |
710 | noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", |
711 | JFFS2_MAGIC_BITMASK, ofs, | |
1da177e4 | 712 | je16_to_cpu(node->magic)); |
68270995 DW |
713 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
714 | return err; | |
1da177e4 LT |
715 | ofs += 4; |
716 | continue; | |
717 | } | |
718 | /* We seem to have a node of sorts. Check the CRC */ | |
719 | crcnode.magic = node->magic; | |
720 | crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); | |
721 | crcnode.totlen = node->totlen; | |
722 | hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); | |
723 | ||
724 | if (hdr_crc != je32_to_cpu(node->hdr_crc)) { | |
725 | 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", | |
726 | ofs, je16_to_cpu(node->magic), | |
182ec4ee | 727 | je16_to_cpu(node->nodetype), |
1da177e4 LT |
728 | je32_to_cpu(node->totlen), |
729 | je32_to_cpu(node->hdr_crc), | |
730 | hdr_crc); | |
68270995 DW |
731 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
732 | return err; | |
1da177e4 LT |
733 | ofs += 4; |
734 | continue; | |
735 | } | |
736 | ||
182ec4ee | 737 | if (ofs + je32_to_cpu(node->totlen) > |
1da177e4 LT |
738 | jeb->offset + c->sector_size) { |
739 | /* Eep. Node goes over the end of the erase block. */ | |
740 | printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", | |
741 | ofs, je32_to_cpu(node->totlen)); | |
742 | printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n"); | |
68270995 DW |
743 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
744 | return err; | |
1da177e4 LT |
745 | ofs += 4; |
746 | continue; | |
747 | } | |
748 | ||
749 | if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { | |
750 | /* Wheee. This is an obsoleted node */ | |
751 | D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs)); | |
68270995 DW |
752 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
753 | return err; | |
1da177e4 LT |
754 | ofs += PAD(je32_to_cpu(node->totlen)); |
755 | continue; | |
756 | } | |
757 | ||
758 | switch(je16_to_cpu(node->nodetype)) { | |
759 | case JFFS2_NODETYPE_INODE: | |
760 | if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { | |
761 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
762 | D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", | |
763 | sizeof(struct jffs2_raw_inode), buf_len, ofs)); | |
764 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
765 | if (err) | |
766 | return err; | |
767 | buf_ofs = ofs; | |
768 | node = (void *)buf; | |
769 | } | |
e631ddba | 770 | err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); |
1da177e4 LT |
771 | if (err) return err; |
772 | ofs += PAD(je32_to_cpu(node->totlen)); | |
773 | break; | |
182ec4ee | 774 | |
1da177e4 LT |
775 | case JFFS2_NODETYPE_DIRENT: |
776 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
777 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
778 | D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", | |
779 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
780 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
781 | if (err) | |
782 | return err; | |
783 | buf_ofs = ofs; | |
784 | node = (void *)buf; | |
785 | } | |
e631ddba | 786 | err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); |
1da177e4 LT |
787 | if (err) return err; |
788 | ofs += PAD(je32_to_cpu(node->totlen)); | |
789 | break; | |
790 | ||
aa98d7cf KK |
791 | #ifdef CONFIG_JFFS2_FS_XATTR |
792 | case JFFS2_NODETYPE_XATTR: | |
793 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
794 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
795 | D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)" | |
796 | " left to end of buf. Reading 0x%x at 0x%08x\n", | |
797 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
798 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
799 | if (err) | |
800 | return err; | |
801 | buf_ofs = ofs; | |
802 | node = (void *)buf; | |
803 | } | |
804 | err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); | |
805 | if (err) | |
806 | return err; | |
807 | ofs += PAD(je32_to_cpu(node->totlen)); | |
808 | break; | |
809 | case JFFS2_NODETYPE_XREF: | |
810 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
811 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
812 | D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)" | |
813 | " left to end of buf. Reading 0x%x at 0x%08x\n", | |
814 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
815 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
816 | if (err) | |
817 | return err; | |
818 | buf_ofs = ofs; | |
819 | node = (void *)buf; | |
820 | } | |
821 | err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); | |
822 | if (err) | |
823 | return err; | |
824 | ofs += PAD(je32_to_cpu(node->totlen)); | |
825 | break; | |
826 | #endif /* CONFIG_JFFS2_FS_XATTR */ | |
827 | ||
1da177e4 LT |
828 | case JFFS2_NODETYPE_CLEANMARKER: |
829 | D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs)); | |
830 | if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { | |
182ec4ee | 831 | printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", |
1da177e4 | 832 | ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); |
68270995 DW |
833 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) |
834 | return err; | |
1da177e4 LT |
835 | ofs += PAD(sizeof(struct jffs2_unknown_node)); |
836 | } else if (jeb->first_node) { | |
837 | printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); | |
68270995 DW |
838 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) |
839 | return err; | |
1da177e4 LT |
840 | ofs += PAD(sizeof(struct jffs2_unknown_node)); |
841 | } else { | |
842 | struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref(); | |
843 | if (!marker_ref) { | |
844 | printk(KERN_NOTICE "Failed to allocate node ref for clean marker\n"); | |
845 | return -ENOMEM; | |
846 | } | |
1da177e4 | 847 | marker_ref->flash_offset = ofs | REF_NORMAL; |
182ec4ee | 848 | |
fcb75787 | 849 | jffs2_link_node_ref(c, jeb, marker_ref, c->cleanmarker_size, NULL); |
f1f9671b | 850 | |
1da177e4 LT |
851 | ofs += PAD(c->cleanmarker_size); |
852 | } | |
853 | break; | |
854 | ||
855 | case JFFS2_NODETYPE_PADDING: | |
e631ddba FH |
856 | if (jffs2_sum_active()) |
857 | jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); | |
68270995 DW |
858 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
859 | return err; | |
1da177e4 LT |
860 | ofs += PAD(je32_to_cpu(node->totlen)); |
861 | break; | |
862 | ||
863 | default: | |
864 | switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { | |
865 | case JFFS2_FEATURE_ROCOMPAT: | |
866 | printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); | |
867 | c->flags |= JFFS2_SB_FLAG_RO; | |
868 | if (!(jffs2_is_readonly(c))) | |
869 | return -EROFS; | |
68270995 DW |
870 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
871 | return err; | |
1da177e4 LT |
872 | ofs += PAD(je32_to_cpu(node->totlen)); |
873 | break; | |
874 | ||
875 | case JFFS2_FEATURE_INCOMPAT: | |
876 | printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); | |
877 | return -EINVAL; | |
878 | ||
879 | case JFFS2_FEATURE_RWCOMPAT_DELETE: | |
880 | 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 |
881 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
882 | return err; | |
1da177e4 LT |
883 | ofs += PAD(je32_to_cpu(node->totlen)); |
884 | break; | |
885 | ||
6171586a DW |
886 | case JFFS2_FEATURE_RWCOMPAT_COPY: { |
887 | struct jffs2_raw_node_ref *ref; | |
1da177e4 | 888 | D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); |
6171586a DW |
889 | |
890 | ref = jffs2_alloc_raw_node_ref(); | |
891 | if (!ref) | |
892 | return -ENOMEM; | |
893 | ref->flash_offset = ofs | REF_PRISTINE; | |
fcb75787 | 894 | jffs2_link_node_ref(c, jeb, ref, PAD(je32_to_cpu(node->totlen)), NULL); |
6171586a DW |
895 | |
896 | /* We can't summarise nodes we don't grok */ | |
897 | jffs2_sum_disable_collecting(s); | |
1da177e4 LT |
898 | ofs += PAD(je32_to_cpu(node->totlen)); |
899 | break; | |
6171586a | 900 | } |
1da177e4 LT |
901 | } |
902 | } | |
903 | } | |
904 | ||
e631ddba FH |
905 | if (jffs2_sum_active()) { |
906 | if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { | |
733802d9 | 907 | dbg_summary("There is not enough space for " |
e631ddba FH |
908 | "summary information, disabling for this jeb!\n"); |
909 | jffs2_sum_disable_collecting(s); | |
910 | } | |
911 | } | |
1da177e4 | 912 | |
182ec4ee | 913 | D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x\n", jeb->offset, |
1da177e4 LT |
914 | jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size)); |
915 | ||
916 | /* mark_node_obsolete can add to wasted !! */ | |
917 | if (jeb->wasted_size) { | |
918 | jeb->dirty_size += jeb->wasted_size; | |
919 | c->dirty_size += jeb->wasted_size; | |
920 | c->wasted_size -= jeb->wasted_size; | |
921 | jeb->wasted_size = 0; | |
922 | } | |
923 | ||
e631ddba | 924 | return jffs2_scan_classify_jeb(c, jeb); |
1da177e4 LT |
925 | } |
926 | ||
e631ddba | 927 | struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) |
1da177e4 LT |
928 | { |
929 | struct jffs2_inode_cache *ic; | |
930 | ||
931 | ic = jffs2_get_ino_cache(c, ino); | |
932 | if (ic) | |
933 | return ic; | |
934 | ||
935 | if (ino > c->highest_ino) | |
936 | c->highest_ino = ino; | |
937 | ||
938 | ic = jffs2_alloc_inode_cache(); | |
939 | if (!ic) { | |
940 | printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n"); | |
941 | return NULL; | |
942 | } | |
943 | memset(ic, 0, sizeof(*ic)); | |
944 | ||
945 | ic->ino = ino; | |
946 | ic->nodes = (void *)ic; | |
947 | jffs2_add_ino_cache(c, ic); | |
948 | if (ino == 1) | |
949 | ic->nlink = 1; | |
950 | return ic; | |
951 | } | |
952 | ||
182ec4ee | 953 | static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 954 | struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) |
1da177e4 LT |
955 | { |
956 | struct jffs2_raw_node_ref *raw; | |
957 | struct jffs2_inode_cache *ic; | |
958 | uint32_t ino = je32_to_cpu(ri->ino); | |
68270995 | 959 | int err; |
1da177e4 LT |
960 | |
961 | D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); | |
962 | ||
963 | /* We do very little here now. Just check the ino# to which we should attribute | |
182ec4ee | 964 | this node; we can do all the CRC checking etc. later. There's a tradeoff here -- |
1da177e4 LT |
965 | we used to scan the flash once only, reading everything we want from it into |
966 | memory, then building all our in-core data structures and freeing the extra | |
967 | information. Now we allow the first part of the mount to complete a lot quicker, | |
182ec4ee | 968 | but we have to go _back_ to the flash in order to finish the CRC checking, etc. |
1da177e4 LT |
969 | Which means that the _full_ amount of time to get to proper write mode with GC |
970 | operational may actually be _longer_ than before. Sucks to be me. */ | |
971 | ||
972 | raw = jffs2_alloc_raw_node_ref(); | |
973 | if (!raw) { | |
974 | printk(KERN_NOTICE "jffs2_scan_inode_node(): allocation of node reference failed\n"); | |
975 | return -ENOMEM; | |
976 | } | |
977 | ||
978 | ic = jffs2_get_ino_cache(c, ino); | |
979 | if (!ic) { | |
980 | /* Inocache get failed. Either we read a bogus ino# or it's just genuinely the | |
981 | first node we found for this inode. Do a CRC check to protect against the former | |
982 | case */ | |
983 | uint32_t crc = crc32(0, ri, sizeof(*ri)-8); | |
984 | ||
985 | if (crc != je32_to_cpu(ri->node_crc)) { | |
986 | printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
987 | ofs, je32_to_cpu(ri->node_crc), crc); | |
988 | /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ | |
68270995 DW |
989 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(ri->totlen))))) |
990 | return err; | |
1da177e4 LT |
991 | jffs2_free_raw_node_ref(raw); |
992 | return 0; | |
993 | } | |
994 | ic = jffs2_scan_make_ino_cache(c, ino); | |
995 | if (!ic) { | |
996 | jffs2_free_raw_node_ref(raw); | |
997 | return -ENOMEM; | |
998 | } | |
999 | } | |
1000 | ||
1001 | /* Wheee. It worked */ | |
1002 | ||
1003 | raw->flash_offset = ofs | REF_UNCHECKED; | |
1da177e4 | 1004 | |
fcb75787 | 1005 | jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(ri->totlen)), ic); |
1da177e4 | 1006 | |
182ec4ee | 1007 | D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n", |
1da177e4 LT |
1008 | je32_to_cpu(ri->ino), je32_to_cpu(ri->version), |
1009 | je32_to_cpu(ri->offset), | |
1010 | je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize))); | |
1011 | ||
1012 | pseudo_random += je32_to_cpu(ri->version); | |
1013 | ||
e631ddba FH |
1014 | if (jffs2_sum_active()) { |
1015 | jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); | |
1016 | } | |
1017 | ||
1da177e4 LT |
1018 | return 0; |
1019 | } | |
1020 | ||
182ec4ee | 1021 | static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 1022 | struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) |
1da177e4 LT |
1023 | { |
1024 | struct jffs2_raw_node_ref *raw; | |
1025 | struct jffs2_full_dirent *fd; | |
1026 | struct jffs2_inode_cache *ic; | |
1027 | uint32_t crc; | |
68270995 | 1028 | int err; |
1da177e4 LT |
1029 | |
1030 | D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs)); | |
1031 | ||
1032 | /* We don't get here unless the node is still valid, so we don't have to | |
1033 | mask in the ACCURATE bit any more. */ | |
1034 | crc = crc32(0, rd, sizeof(*rd)-8); | |
1035 | ||
1036 | if (crc != je32_to_cpu(rd->node_crc)) { | |
1037 | printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
1038 | ofs, je32_to_cpu(rd->node_crc), crc); | |
1039 | /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ | |
68270995 DW |
1040 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) |
1041 | return err; | |
1da177e4 LT |
1042 | return 0; |
1043 | } | |
1044 | ||
1045 | pseudo_random += je32_to_cpu(rd->version); | |
1046 | ||
1047 | fd = jffs2_alloc_full_dirent(rd->nsize+1); | |
1048 | if (!fd) { | |
1049 | return -ENOMEM; | |
1050 | } | |
1051 | memcpy(&fd->name, rd->name, rd->nsize); | |
1052 | fd->name[rd->nsize] = 0; | |
1053 | ||
1054 | crc = crc32(0, fd->name, rd->nsize); | |
1055 | if (crc != je32_to_cpu(rd->name_crc)) { | |
1056 | printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
182ec4ee | 1057 | ofs, je32_to_cpu(rd->name_crc), crc); |
1da177e4 LT |
1058 | D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino))); |
1059 | jffs2_free_full_dirent(fd); | |
1060 | /* FIXME: Why do we believe totlen? */ | |
1061 | /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ | |
68270995 DW |
1062 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) |
1063 | return err; | |
1da177e4 LT |
1064 | return 0; |
1065 | } | |
1066 | raw = jffs2_alloc_raw_node_ref(); | |
1067 | if (!raw) { | |
1068 | jffs2_free_full_dirent(fd); | |
1069 | printk(KERN_NOTICE "jffs2_scan_dirent_node(): allocation of node reference failed\n"); | |
1070 | return -ENOMEM; | |
1071 | } | |
1072 | ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); | |
1073 | if (!ic) { | |
1074 | jffs2_free_full_dirent(fd); | |
1075 | jffs2_free_raw_node_ref(raw); | |
1076 | return -ENOMEM; | |
1077 | } | |
182ec4ee | 1078 | |
1da177e4 | 1079 | raw->flash_offset = ofs | REF_PRISTINE; |
fcb75787 | 1080 | jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(rd->totlen)), ic); |
1da177e4 LT |
1081 | |
1082 | fd->raw = raw; | |
1083 | fd->next = NULL; | |
1084 | fd->version = je32_to_cpu(rd->version); | |
1085 | fd->ino = je32_to_cpu(rd->ino); | |
1086 | fd->nhash = full_name_hash(fd->name, rd->nsize); | |
1087 | fd->type = rd->type; | |
1da177e4 LT |
1088 | jffs2_add_fd_to_list(c, fd, &ic->scan_dents); |
1089 | ||
e631ddba FH |
1090 | if (jffs2_sum_active()) { |
1091 | jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); | |
1092 | } | |
1093 | ||
1da177e4 LT |
1094 | return 0; |
1095 | } | |
1096 | ||
1097 | static int count_list(struct list_head *l) | |
1098 | { | |
1099 | uint32_t count = 0; | |
1100 | struct list_head *tmp; | |
1101 | ||
1102 | list_for_each(tmp, l) { | |
1103 | count++; | |
1104 | } | |
1105 | return count; | |
1106 | } | |
1107 | ||
1108 | /* Note: This breaks if list_empty(head). I don't care. You | |
1109 | might, if you copy this code and use it elsewhere :) */ | |
1110 | static void rotate_list(struct list_head *head, uint32_t count) | |
1111 | { | |
1112 | struct list_head *n = head->next; | |
1113 | ||
1114 | list_del(head); | |
1115 | while(count--) { | |
1116 | n = n->next; | |
1117 | } | |
1118 | list_add(head, n); | |
1119 | } | |
1120 | ||
1121 | void jffs2_rotate_lists(struct jffs2_sb_info *c) | |
1122 | { | |
1123 | uint32_t x; | |
1124 | uint32_t rotateby; | |
1125 | ||
1126 | x = count_list(&c->clean_list); | |
1127 | if (x) { | |
1128 | rotateby = pseudo_random % x; | |
1da177e4 | 1129 | rotate_list((&c->clean_list), rotateby); |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | x = count_list(&c->very_dirty_list); | |
1133 | if (x) { | |
1134 | rotateby = pseudo_random % x; | |
1da177e4 | 1135 | rotate_list((&c->very_dirty_list), rotateby); |
1da177e4 LT |
1136 | } |
1137 | ||
1138 | x = count_list(&c->dirty_list); | |
1139 | if (x) { | |
1140 | rotateby = pseudo_random % x; | |
1da177e4 | 1141 | rotate_list((&c->dirty_list), rotateby); |
1da177e4 LT |
1142 | } |
1143 | ||
1144 | x = count_list(&c->erasable_list); | |
1145 | if (x) { | |
1146 | rotateby = pseudo_random % x; | |
1da177e4 | 1147 | rotate_list((&c->erasable_list), rotateby); |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | if (c->nr_erasing_blocks) { | |
1151 | rotateby = pseudo_random % c->nr_erasing_blocks; | |
1da177e4 | 1152 | rotate_list((&c->erase_pending_list), rotateby); |
1da177e4 LT |
1153 | } |
1154 | ||
1155 | if (c->nr_free_blocks) { | |
1156 | rotateby = pseudo_random % c->nr_free_blocks; | |
1da177e4 | 1157 | rotate_list((&c->free_list), rotateby); |
1da177e4 LT |
1158 | } |
1159 | } |