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 | { | |
a6a8bef7 DW |
70 | int ret; |
71 | ||
72 | if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1))) | |
73 | return ret; | |
74 | if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size))) | |
25090a6b DW |
75 | return ret; |
76 | /* Turned wasted size into dirty, since we apparently | |
77 | think it's recoverable now. */ | |
78 | jeb->dirty_size += jeb->wasted_size; | |
79 | c->dirty_size += jeb->wasted_size; | |
80 | c->wasted_size -= jeb->wasted_size; | |
81 | jeb->wasted_size = 0; | |
82 | if (VERYDIRTY(c, jeb->dirty_size)) { | |
83 | list_add(&jeb->list, &c->very_dirty_list); | |
84 | } else { | |
85 | list_add(&jeb->list, &c->dirty_list); | |
86 | } | |
87 | return 0; | |
88 | } | |
89 | ||
1da177e4 LT |
90 | int jffs2_scan_medium(struct jffs2_sb_info *c) |
91 | { | |
92 | int i, ret; | |
93 | uint32_t empty_blocks = 0, bad_blocks = 0; | |
94 | unsigned char *flashbuf = NULL; | |
95 | uint32_t buf_size = 0; | |
e631ddba | 96 | struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ |
1da177e4 LT |
97 | #ifndef __ECOS |
98 | size_t pointlen; | |
99 | ||
100 | if (c->mtd->point) { | |
101 | ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf); | |
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)); | |
105 | c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); | |
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 | 132 | if (!s) { |
85de3d9b | 133 | kfree(flashbuf); |
e631ddba FH |
134 | JFFS2_WARNING("Can't allocate memory for summary\n"); |
135 | return -ENOMEM; | |
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) | |
199 | return ret; | |
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) | |
210 | return ret; | |
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 | } | |
263 | jffs2_erase_pending_trigger(c); | |
264 | } | |
265 | ret = 0; | |
266 | out: | |
267 | if (buf_size) | |
268 | kfree(flashbuf); | |
269 | #ifndef __ECOS | |
182ec4ee | 270 | else |
1da177e4 LT |
271 | c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); |
272 | #endif | |
5b5ffbc1 FM |
273 | if (s) |
274 | kfree(s); | |
275 | ||
1da177e4 LT |
276 | return ret; |
277 | } | |
278 | ||
c05d52c7 AB |
279 | static int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf, |
280 | uint32_t ofs, uint32_t len) | |
1da177e4 LT |
281 | { |
282 | int ret; | |
283 | size_t retlen; | |
284 | ||
285 | ret = jffs2_flash_read(c, ofs, len, &retlen, buf); | |
286 | if (ret) { | |
287 | D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret)); | |
288 | return ret; | |
289 | } | |
290 | if (retlen < len) { | |
291 | D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen)); | |
292 | return -EIO; | |
293 | } | |
1da177e4 LT |
294 | return 0; |
295 | } | |
296 | ||
e631ddba FH |
297 | int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) |
298 | { | |
299 | if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size | |
99988f7b | 300 | && (!jeb->first_node || !ref_next(jeb->first_node)) ) |
e631ddba FH |
301 | return BLK_STATE_CLEANMARKER; |
302 | ||
303 | /* move blocks with max 4 byte dirty space to cleanlist */ | |
304 | else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { | |
305 | c->dirty_size -= jeb->dirty_size; | |
306 | c->wasted_size += jeb->dirty_size; | |
307 | jeb->wasted_size += jeb->dirty_size; | |
308 | jeb->dirty_size = 0; | |
309 | return BLK_STATE_CLEAN; | |
310 | } else if (jeb->used_size || jeb->unchecked_size) | |
311 | return BLK_STATE_PARTDIRTY; | |
312 | else | |
313 | return BLK_STATE_ALLDIRTY; | |
314 | } | |
315 | ||
aa98d7cf KK |
316 | #ifdef CONFIG_JFFS2_FS_XATTR |
317 | static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, | |
318 | struct jffs2_raw_xattr *rx, uint32_t ofs, | |
319 | struct jffs2_summary *s) | |
320 | { | |
321 | struct jffs2_xattr_datum *xd; | |
c9f700f8 | 322 | uint32_t xid, version, totlen, crc; |
68270995 | 323 | int err; |
aa98d7cf KK |
324 | |
325 | crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); | |
326 | if (crc != je32_to_cpu(rx->node_crc)) { | |
c9f700f8 KK |
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 | ||
c9f700f8 KK |
334 | xid = je32_to_cpu(rx->xid); |
335 | version = je32_to_cpu(rx->version); | |
336 | ||
8a13695c KK |
337 | totlen = PAD(sizeof(struct jffs2_raw_xattr) |
338 | + rx->name_len + 1 + je16_to_cpu(rx->value_len)); | |
aa98d7cf KK |
339 | if (totlen != je32_to_cpu(rx->totlen)) { |
340 | JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", | |
341 | ofs, je32_to_cpu(rx->totlen), totlen); | |
68270995 DW |
342 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) |
343 | return err; | |
aa98d7cf KK |
344 | return 0; |
345 | } | |
346 | ||
c9f700f8 KK |
347 | xd = jffs2_setup_xattr_datum(c, xid, version); |
348 | if (IS_ERR(xd)) | |
aa98d7cf | 349 | return PTR_ERR(xd); |
aa98d7cf | 350 | |
c9f700f8 KK |
351 | if (xd->version > version) { |
352 | struct jffs2_raw_node_ref *raw | |
353 | = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL); | |
354 | raw->next_in_ino = xd->node->next_in_ino; | |
355 | xd->node->next_in_ino = raw; | |
356 | } else { | |
357 | xd->version = version; | |
358 | xd->xprefix = rx->xprefix; | |
359 | xd->name_len = rx->name_len; | |
360 | xd->value_len = je16_to_cpu(rx->value_len); | |
361 | xd->data_crc = je32_to_cpu(rx->data_crc); | |
362 | ||
363 | jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd); | |
364 | } | |
f1f9671b | 365 | |
aa98d7cf KK |
366 | if (jffs2_sum_active()) |
367 | jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset); | |
368 | dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n", | |
369 | ofs, xd->xid, xd->version); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, | |
374 | struct jffs2_raw_xref *rr, uint32_t ofs, | |
375 | struct jffs2_summary *s) | |
376 | { | |
377 | struct jffs2_xattr_ref *ref; | |
aa98d7cf | 378 | uint32_t crc; |
68270995 | 379 | int err; |
aa98d7cf KK |
380 | |
381 | crc = crc32(0, rr, sizeof(*rr) - 4); | |
382 | if (crc != je32_to_cpu(rr->node_crc)) { | |
c9f700f8 KK |
383 | JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
384 | ofs, je32_to_cpu(rr->node_crc), crc); | |
68270995 DW |
385 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) |
386 | return err; | |
aa98d7cf KK |
387 | return 0; |
388 | } | |
389 | ||
390 | if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { | |
89291a9d | 391 | JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n", |
aa98d7cf KK |
392 | ofs, je32_to_cpu(rr->totlen), |
393 | PAD(sizeof(struct jffs2_raw_xref))); | |
68270995 DW |
394 | if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) |
395 | return err; | |
aa98d7cf KK |
396 | return 0; |
397 | } | |
398 | ||
399 | ref = jffs2_alloc_xattr_ref(); | |
400 | if (!ref) | |
401 | return -ENOMEM; | |
402 | ||
aa98d7cf | 403 | /* BEFORE jffs2_build_xattr_subsystem() called, |
c9f700f8 | 404 | * and AFTER xattr_ref is marked as a dead xref, |
aa98d7cf KK |
405 | * ref->xid is used to store 32bit xid, xd is not used |
406 | * ref->ino is used to store 32bit inode-number, ic is not used | |
407 | * Thoes variables are declared as union, thus using those | |
8f2b6f49 | 408 | * are exclusive. In a similar way, ref->next is temporarily |
aa98d7cf KK |
409 | * used to chain all xattr_ref object. It's re-chained to |
410 | * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. | |
411 | */ | |
aa98d7cf KK |
412 | ref->ino = je32_to_cpu(rr->ino); |
413 | ref->xid = je32_to_cpu(rr->xid); | |
c9f700f8 KK |
414 | ref->xseqno = je32_to_cpu(rr->xseqno); |
415 | if (ref->xseqno > c->highest_xseqno) | |
416 | c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); | |
8f2b6f49 KK |
417 | ref->next = c->xref_temp; |
418 | c->xref_temp = ref; | |
aa98d7cf | 419 | |
c9f700f8 | 420 | jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref); |
f1f9671b | 421 | |
aa98d7cf KK |
422 | if (jffs2_sum_active()) |
423 | jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); | |
424 | dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", | |
425 | ofs, ref->xid, ref->ino); | |
426 | return 0; | |
427 | } | |
428 | #endif | |
429 | ||
9641b784 DW |
430 | /* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into |
431 | the flash, XIP-style */ | |
1da177e4 | 432 | static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
9641b784 | 433 | unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { |
1da177e4 LT |
434 | struct jffs2_unknown_node *node; |
435 | struct jffs2_unknown_node crcnode; | |
436 | uint32_t ofs, prevofs; | |
437 | uint32_t hdr_crc, buf_ofs, buf_len; | |
438 | int err; | |
439 | int noise = 0; | |
e631ddba FH |
440 | |
441 | ||
2f82ce1e | 442 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
443 | int cleanmarkerfound = 0; |
444 | #endif | |
445 | ||
446 | ofs = jeb->offset; | |
447 | prevofs = jeb->offset - 1; | |
448 | ||
449 | D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs)); | |
450 | ||
2f82ce1e | 451 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
452 | if (jffs2_cleanmarker_oob(c)) { |
453 | int ret = jffs2_check_nand_cleanmarker(c, jeb); | |
454 | D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret)); | |
455 | /* Even if it's not found, we still scan to see | |
456 | if the block is empty. We use this information | |
457 | to decide whether to erase it or not. */ | |
458 | switch (ret) { | |
459 | case 0: cleanmarkerfound = 1; break; | |
460 | case 1: break; | |
461 | case 2: return BLK_STATE_BADBLOCK; | |
462 | case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */ | |
463 | default: return ret; | |
464 | } | |
465 | } | |
466 | #endif | |
e631ddba FH |
467 | |
468 | if (jffs2_sum_active()) { | |
9641b784 DW |
469 | struct jffs2_sum_marker *sm; |
470 | void *sumptr = NULL; | |
471 | uint32_t sumlen; | |
472 | ||
473 | if (!buf_size) { | |
474 | /* XIP case. Just look, point at the summary if it's there */ | |
13ba42df | 475 | sm = (void *)buf + c->sector_size - sizeof(*sm); |
9641b784 DW |
476 | if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { |
477 | sumptr = buf + je32_to_cpu(sm->offset); | |
478 | sumlen = c->sector_size - je32_to_cpu(sm->offset); | |
479 | } | |
480 | } else { | |
481 | /* If NAND flash, read a whole page of it. Else just the end */ | |
482 | if (c->wbuf_pagesize) | |
483 | buf_len = c->wbuf_pagesize; | |
484 | else | |
485 | buf_len = sizeof(*sm); | |
486 | ||
487 | /* Read as much as we want into the _end_ of the preallocated buffer */ | |
488 | err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, | |
489 | jeb->offset + c->sector_size - buf_len, | |
490 | buf_len); | |
491 | if (err) | |
492 | return err; | |
493 | ||
494 | sm = (void *)buf + buf_size - sizeof(*sm); | |
495 | if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { | |
496 | sumlen = c->sector_size - je32_to_cpu(sm->offset); | |
497 | sumptr = buf + buf_size - sumlen; | |
498 | ||
499 | /* Now, make sure the summary itself is available */ | |
500 | if (sumlen > buf_size) { | |
501 | /* Need to kmalloc for this. */ | |
502 | sumptr = kmalloc(sumlen, GFP_KERNEL); | |
503 | if (!sumptr) | |
504 | return -ENOMEM; | |
505 | memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); | |
506 | } | |
507 | if (buf_len < sumlen) { | |
508 | /* Need to read more so that the entire summary node is present */ | |
509 | err = jffs2_fill_scan_buf(c, sumptr, | |
510 | jeb->offset + c->sector_size - sumlen, | |
511 | sumlen - buf_len); | |
512 | if (err) | |
513 | return err; | |
514 | } | |
515 | } | |
e631ddba | 516 | |
e631ddba FH |
517 | } |
518 | ||
9641b784 DW |
519 | if (sumptr) { |
520 | err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); | |
3560160a | 521 | |
9641b784 DW |
522 | if (buf_size && sumlen > buf_size) |
523 | kfree(sumptr); | |
3560160a DW |
524 | /* If it returns with a real error, bail. |
525 | If it returns positive, that's a block classification | |
526 | (i.e. BLK_STATE_xxx) so return that too. | |
527 | If it returns zero, fall through to full scan. */ | |
528 | if (err) | |
529 | return err; | |
e631ddba | 530 | } |
e631ddba FH |
531 | } |
532 | ||
1da177e4 LT |
533 | buf_ofs = jeb->offset; |
534 | ||
535 | if (!buf_size) { | |
9641b784 | 536 | /* This is the XIP case -- we're reading _directly_ from the flash chip */ |
1da177e4 LT |
537 | buf_len = c->sector_size; |
538 | } else { | |
3be36675 | 539 | buf_len = EMPTY_SCAN_SIZE(c->sector_size); |
1da177e4 LT |
540 | err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); |
541 | if (err) | |
542 | return err; | |
543 | } | |
182ec4ee | 544 | |
1da177e4 LT |
545 | /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ |
546 | ofs = 0; | |
547 | ||
548 | /* Scan only 4KiB of 0xFF before declaring it's empty */ | |
3be36675 | 549 | while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) |
1da177e4 LT |
550 | ofs += 4; |
551 | ||
3be36675 | 552 | if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) { |
2f82ce1e | 553 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
554 | if (jffs2_cleanmarker_oob(c)) { |
555 | /* scan oob, take care of cleanmarker */ | |
556 | int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); | |
557 | D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret)); | |
558 | switch (ret) { | |
559 | case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; | |
560 | case 1: return BLK_STATE_ALLDIRTY; | |
561 | default: return ret; | |
562 | } | |
563 | } | |
564 | #endif | |
565 | D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset)); | |
8f15fd55 AV |
566 | if (c->cleanmarker_size == 0) |
567 | return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ | |
568 | else | |
569 | return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ | |
1da177e4 LT |
570 | } |
571 | if (ofs) { | |
572 | D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset, | |
573 | jeb->offset + ofs)); | |
a6a8bef7 DW |
574 | if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1))) |
575 | return err; | |
68270995 DW |
576 | if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) |
577 | return err; | |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Now ofs is a complete physical flash offset as it always was... */ | |
581 | ofs += jeb->offset; | |
582 | ||
583 | noise = 10; | |
584 | ||
733802d9 | 585 | dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); |
e631ddba | 586 | |
182ec4ee | 587 | scan_more: |
1da177e4 LT |
588 | while(ofs < jeb->offset + c->sector_size) { |
589 | ||
e0c8e42f | 590 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
1da177e4 | 591 | |
2f785402 | 592 | /* Make sure there are node refs available for use */ |
046b8b98 | 593 | err = jffs2_prealloc_raw_node_refs(c, jeb, 2); |
2f785402 DW |
594 | if (err) |
595 | return err; | |
596 | ||
1da177e4 LT |
597 | cond_resched(); |
598 | ||
599 | if (ofs & 3) { | |
600 | printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs); | |
601 | ofs = PAD(ofs); | |
602 | continue; | |
603 | } | |
604 | if (ofs == prevofs) { | |
605 | printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs); | |
68270995 DW |
606 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
607 | return err; | |
1da177e4 LT |
608 | ofs += 4; |
609 | continue; | |
610 | } | |
611 | prevofs = ofs; | |
612 | ||
613 | if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { | |
614 | 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), | |
615 | jeb->offset, c->sector_size, ofs, sizeof(*node))); | |
68270995 DW |
616 | if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) |
617 | return err; | |
1da177e4 LT |
618 | break; |
619 | } | |
620 | ||
621 | if (buf_ofs + buf_len < ofs + sizeof(*node)) { | |
622 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
623 | D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", | |
624 | sizeof(struct jffs2_unknown_node), buf_len, ofs)); | |
625 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
626 | if (err) | |
627 | return err; | |
628 | buf_ofs = ofs; | |
629 | } | |
630 | ||
631 | node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; | |
632 | ||
633 | if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { | |
634 | uint32_t inbuf_ofs; | |
635 | uint32_t empty_start; | |
636 | ||
637 | empty_start = ofs; | |
638 | ofs += 4; | |
639 | ||
640 | D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); | |
641 | more_empty: | |
642 | inbuf_ofs = ofs - buf_ofs; | |
643 | while (inbuf_ofs < buf_len) { | |
644 | if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff) { | |
645 | printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", | |
646 | empty_start, ofs); | |
68270995 DW |
647 | if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) |
648 | return err; | |
1da177e4 LT |
649 | goto scan_more; |
650 | } | |
651 | ||
652 | inbuf_ofs+=4; | |
653 | ofs += 4; | |
654 | } | |
655 | /* Ran off end. */ | |
656 | D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs)); | |
657 | ||
658 | /* If we're only checking the beginning of a block with a cleanmarker, | |
659 | bail now */ | |
182ec4ee | 660 | if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && |
99988f7b | 661 | c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) { |
3be36675 | 662 | D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); |
1da177e4 LT |
663 | return BLK_STATE_CLEANMARKER; |
664 | } | |
665 | ||
666 | /* See how much more there is to read in this eraseblock... */ | |
667 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
668 | if (!buf_len) { | |
182ec4ee | 669 | /* No more to read. Break out of main loop without marking |
1da177e4 LT |
670 | this range of empty space as dirty (because it's not) */ |
671 | D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n", | |
672 | empty_start)); | |
673 | break; | |
674 | } | |
675 | D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); | |
676 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
677 | if (err) | |
678 | return err; | |
679 | buf_ofs = ofs; | |
680 | goto more_empty; | |
681 | } | |
682 | ||
683 | if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { | |
684 | printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); | |
68270995 DW |
685 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
686 | return err; | |
1da177e4 LT |
687 | ofs += 4; |
688 | continue; | |
689 | } | |
690 | if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { | |
691 | D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs)); | |
68270995 DW |
692 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
693 | return err; | |
1da177e4 LT |
694 | ofs += 4; |
695 | continue; | |
696 | } | |
697 | if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { | |
698 | printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs); | |
699 | printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n"); | |
68270995 DW |
700 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
701 | return err; | |
1da177e4 LT |
702 | ofs += 4; |
703 | continue; | |
704 | } | |
705 | if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { | |
706 | /* OK. We're out of possibilities. Whinge and move on */ | |
182ec4ee TG |
707 | noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", |
708 | JFFS2_MAGIC_BITMASK, ofs, | |
1da177e4 | 709 | je16_to_cpu(node->magic)); |
68270995 DW |
710 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
711 | return err; | |
1da177e4 LT |
712 | ofs += 4; |
713 | continue; | |
714 | } | |
715 | /* We seem to have a node of sorts. Check the CRC */ | |
716 | crcnode.magic = node->magic; | |
717 | crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); | |
718 | crcnode.totlen = node->totlen; | |
719 | hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); | |
720 | ||
721 | if (hdr_crc != je32_to_cpu(node->hdr_crc)) { | |
722 | 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", | |
723 | ofs, je16_to_cpu(node->magic), | |
182ec4ee | 724 | je16_to_cpu(node->nodetype), |
1da177e4 LT |
725 | je32_to_cpu(node->totlen), |
726 | je32_to_cpu(node->hdr_crc), | |
727 | hdr_crc); | |
68270995 DW |
728 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
729 | return err; | |
1da177e4 LT |
730 | ofs += 4; |
731 | continue; | |
732 | } | |
733 | ||
182ec4ee | 734 | if (ofs + je32_to_cpu(node->totlen) > |
1da177e4 LT |
735 | jeb->offset + c->sector_size) { |
736 | /* Eep. Node goes over the end of the erase block. */ | |
737 | printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", | |
738 | ofs, je32_to_cpu(node->totlen)); | |
739 | printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n"); | |
68270995 DW |
740 | if ((err = jffs2_scan_dirty_space(c, jeb, 4))) |
741 | return err; | |
1da177e4 LT |
742 | ofs += 4; |
743 | continue; | |
744 | } | |
745 | ||
746 | if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { | |
747 | /* Wheee. This is an obsoleted node */ | |
748 | D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs)); | |
68270995 DW |
749 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
750 | return err; | |
1da177e4 LT |
751 | ofs += PAD(je32_to_cpu(node->totlen)); |
752 | continue; | |
753 | } | |
754 | ||
755 | switch(je16_to_cpu(node->nodetype)) { | |
756 | case JFFS2_NODETYPE_INODE: | |
757 | if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { | |
758 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
759 | D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", | |
760 | sizeof(struct jffs2_raw_inode), buf_len, ofs)); | |
761 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
762 | if (err) | |
763 | return err; | |
764 | buf_ofs = ofs; | |
765 | node = (void *)buf; | |
766 | } | |
e631ddba | 767 | err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); |
1da177e4 LT |
768 | if (err) return err; |
769 | ofs += PAD(je32_to_cpu(node->totlen)); | |
770 | break; | |
182ec4ee | 771 | |
1da177e4 LT |
772 | case JFFS2_NODETYPE_DIRENT: |
773 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
774 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
775 | D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", | |
776 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
777 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
778 | if (err) | |
779 | return err; | |
780 | buf_ofs = ofs; | |
781 | node = (void *)buf; | |
782 | } | |
e631ddba | 783 | err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); |
1da177e4 LT |
784 | if (err) return err; |
785 | ofs += PAD(je32_to_cpu(node->totlen)); | |
786 | break; | |
787 | ||
aa98d7cf KK |
788 | #ifdef CONFIG_JFFS2_FS_XATTR |
789 | case JFFS2_NODETYPE_XATTR: | |
790 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
791 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
792 | D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)" | |
793 | " left to end of buf. Reading 0x%x at 0x%08x\n", | |
794 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
795 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
796 | if (err) | |
797 | return err; | |
798 | buf_ofs = ofs; | |
799 | node = (void *)buf; | |
800 | } | |
801 | err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); | |
802 | if (err) | |
803 | return err; | |
804 | ofs += PAD(je32_to_cpu(node->totlen)); | |
805 | break; | |
806 | case JFFS2_NODETYPE_XREF: | |
807 | if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { | |
808 | buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); | |
809 | D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)" | |
810 | " left to end of buf. Reading 0x%x at 0x%08x\n", | |
811 | je32_to_cpu(node->totlen), buf_len, ofs)); | |
812 | err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); | |
813 | if (err) | |
814 | return err; | |
815 | buf_ofs = ofs; | |
816 | node = (void *)buf; | |
817 | } | |
818 | err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); | |
819 | if (err) | |
820 | return err; | |
821 | ofs += PAD(je32_to_cpu(node->totlen)); | |
822 | break; | |
823 | #endif /* CONFIG_JFFS2_FS_XATTR */ | |
824 | ||
1da177e4 LT |
825 | case JFFS2_NODETYPE_CLEANMARKER: |
826 | D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs)); | |
827 | if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { | |
182ec4ee | 828 | printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", |
1da177e4 | 829 | ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); |
68270995 DW |
830 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) |
831 | return err; | |
1da177e4 LT |
832 | ofs += PAD(sizeof(struct jffs2_unknown_node)); |
833 | } else if (jeb->first_node) { | |
834 | printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); | |
68270995 DW |
835 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) |
836 | return err; | |
1da177e4 LT |
837 | ofs += PAD(sizeof(struct jffs2_unknown_node)); |
838 | } else { | |
2f785402 | 839 | jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL); |
f1f9671b | 840 | |
1da177e4 LT |
841 | ofs += PAD(c->cleanmarker_size); |
842 | } | |
843 | break; | |
844 | ||
845 | case JFFS2_NODETYPE_PADDING: | |
e631ddba FH |
846 | if (jffs2_sum_active()) |
847 | jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); | |
68270995 DW |
848 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
849 | return err; | |
1da177e4 LT |
850 | ofs += PAD(je32_to_cpu(node->totlen)); |
851 | break; | |
852 | ||
853 | default: | |
854 | switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { | |
855 | case JFFS2_FEATURE_ROCOMPAT: | |
856 | printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); | |
857 | c->flags |= JFFS2_SB_FLAG_RO; | |
858 | if (!(jffs2_is_readonly(c))) | |
859 | return -EROFS; | |
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 | case JFFS2_FEATURE_INCOMPAT: | |
866 | printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); | |
867 | return -EINVAL; | |
868 | ||
869 | case JFFS2_FEATURE_RWCOMPAT_DELETE: | |
870 | 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 |
871 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) |
872 | return err; | |
1da177e4 LT |
873 | ofs += PAD(je32_to_cpu(node->totlen)); |
874 | break; | |
875 | ||
6171586a | 876 | case JFFS2_FEATURE_RWCOMPAT_COPY: { |
1da177e4 | 877 | D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); |
6171586a | 878 | |
2f785402 | 879 | jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL); |
6171586a DW |
880 | |
881 | /* We can't summarise nodes we don't grok */ | |
882 | jffs2_sum_disable_collecting(s); | |
1da177e4 LT |
883 | ofs += PAD(je32_to_cpu(node->totlen)); |
884 | break; | |
6171586a | 885 | } |
1da177e4 LT |
886 | } |
887 | } | |
888 | } | |
889 | ||
e631ddba FH |
890 | if (jffs2_sum_active()) { |
891 | if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { | |
733802d9 | 892 | dbg_summary("There is not enough space for " |
e631ddba FH |
893 | "summary information, disabling for this jeb!\n"); |
894 | jffs2_sum_disable_collecting(s); | |
895 | } | |
896 | } | |
1da177e4 | 897 | |
8b9e9fe8 DW |
898 | D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n", |
899 | jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size)); | |
900 | ||
1da177e4 LT |
901 | /* mark_node_obsolete can add to wasted !! */ |
902 | if (jeb->wasted_size) { | |
903 | jeb->dirty_size += jeb->wasted_size; | |
904 | c->dirty_size += jeb->wasted_size; | |
905 | c->wasted_size -= jeb->wasted_size; | |
906 | jeb->wasted_size = 0; | |
907 | } | |
908 | ||
e631ddba | 909 | return jffs2_scan_classify_jeb(c, jeb); |
1da177e4 LT |
910 | } |
911 | ||
e631ddba | 912 | struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) |
1da177e4 LT |
913 | { |
914 | struct jffs2_inode_cache *ic; | |
915 | ||
916 | ic = jffs2_get_ino_cache(c, ino); | |
917 | if (ic) | |
918 | return ic; | |
919 | ||
920 | if (ino > c->highest_ino) | |
921 | c->highest_ino = ino; | |
922 | ||
923 | ic = jffs2_alloc_inode_cache(); | |
924 | if (!ic) { | |
925 | printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n"); | |
926 | return NULL; | |
927 | } | |
928 | memset(ic, 0, sizeof(*ic)); | |
929 | ||
930 | ic->ino = ino; | |
931 | ic->nodes = (void *)ic; | |
932 | jffs2_add_ino_cache(c, ic); | |
933 | if (ino == 1) | |
934 | ic->nlink = 1; | |
935 | return ic; | |
936 | } | |
937 | ||
182ec4ee | 938 | static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 939 | struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) |
1da177e4 | 940 | { |
1da177e4 LT |
941 | struct jffs2_inode_cache *ic; |
942 | uint32_t ino = je32_to_cpu(ri->ino); | |
68270995 | 943 | int err; |
1da177e4 LT |
944 | |
945 | D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); | |
946 | ||
947 | /* We do very little here now. Just check the ino# to which we should attribute | |
182ec4ee | 948 | this node; we can do all the CRC checking etc. later. There's a tradeoff here -- |
1da177e4 LT |
949 | we used to scan the flash once only, reading everything we want from it into |
950 | memory, then building all our in-core data structures and freeing the extra | |
951 | information. Now we allow the first part of the mount to complete a lot quicker, | |
182ec4ee | 952 | but we have to go _back_ to the flash in order to finish the CRC checking, etc. |
1da177e4 LT |
953 | Which means that the _full_ amount of time to get to proper write mode with GC |
954 | operational may actually be _longer_ than before. Sucks to be me. */ | |
955 | ||
1da177e4 LT |
956 | ic = jffs2_get_ino_cache(c, ino); |
957 | if (!ic) { | |
958 | /* Inocache get failed. Either we read a bogus ino# or it's just genuinely the | |
959 | first node we found for this inode. Do a CRC check to protect against the former | |
960 | case */ | |
961 | uint32_t crc = crc32(0, ri, sizeof(*ri)-8); | |
962 | ||
963 | if (crc != je32_to_cpu(ri->node_crc)) { | |
964 | printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
965 | ofs, je32_to_cpu(ri->node_crc), crc); | |
966 | /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ | |
68270995 DW |
967 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(ri->totlen))))) |
968 | return err; | |
1da177e4 LT |
969 | return 0; |
970 | } | |
971 | ic = jffs2_scan_make_ino_cache(c, ino); | |
2f785402 | 972 | if (!ic) |
1da177e4 | 973 | return -ENOMEM; |
1da177e4 LT |
974 | } |
975 | ||
976 | /* Wheee. It worked */ | |
2f785402 | 977 | jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic); |
1da177e4 | 978 | |
182ec4ee | 979 | D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n", |
1da177e4 LT |
980 | je32_to_cpu(ri->ino), je32_to_cpu(ri->version), |
981 | je32_to_cpu(ri->offset), | |
982 | je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize))); | |
983 | ||
984 | pseudo_random += je32_to_cpu(ri->version); | |
985 | ||
e631ddba FH |
986 | if (jffs2_sum_active()) { |
987 | jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); | |
988 | } | |
989 | ||
1da177e4 LT |
990 | return 0; |
991 | } | |
992 | ||
182ec4ee | 993 | static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
e631ddba | 994 | struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) |
1da177e4 | 995 | { |
1da177e4 LT |
996 | struct jffs2_full_dirent *fd; |
997 | struct jffs2_inode_cache *ic; | |
998 | uint32_t crc; | |
68270995 | 999 | int err; |
1da177e4 LT |
1000 | |
1001 | D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs)); | |
1002 | ||
1003 | /* We don't get here unless the node is still valid, so we don't have to | |
1004 | mask in the ACCURATE bit any more. */ | |
1005 | crc = crc32(0, rd, sizeof(*rd)-8); | |
1006 | ||
1007 | if (crc != je32_to_cpu(rd->node_crc)) { | |
1008 | printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
1009 | ofs, je32_to_cpu(rd->node_crc), crc); | |
1010 | /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ | |
68270995 DW |
1011 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) |
1012 | return err; | |
1da177e4 LT |
1013 | return 0; |
1014 | } | |
1015 | ||
1016 | pseudo_random += je32_to_cpu(rd->version); | |
1017 | ||
1018 | fd = jffs2_alloc_full_dirent(rd->nsize+1); | |
1019 | if (!fd) { | |
1020 | return -ENOMEM; | |
1021 | } | |
1022 | memcpy(&fd->name, rd->name, rd->nsize); | |
1023 | fd->name[rd->nsize] = 0; | |
1024 | ||
1025 | crc = crc32(0, fd->name, rd->nsize); | |
1026 | if (crc != je32_to_cpu(rd->name_crc)) { | |
1027 | printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", | |
182ec4ee | 1028 | ofs, je32_to_cpu(rd->name_crc), crc); |
1da177e4 LT |
1029 | D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino))); |
1030 | jffs2_free_full_dirent(fd); | |
1031 | /* FIXME: Why do we believe totlen? */ | |
1032 | /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ | |
68270995 DW |
1033 | if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) |
1034 | return err; | |
1da177e4 LT |
1035 | return 0; |
1036 | } | |
1da177e4 LT |
1037 | ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); |
1038 | if (!ic) { | |
1039 | jffs2_free_full_dirent(fd); | |
1da177e4 LT |
1040 | return -ENOMEM; |
1041 | } | |
182ec4ee | 1042 | |
2f785402 | 1043 | fd->raw = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rd->totlen)), ic); |
1da177e4 | 1044 | |
1da177e4 LT |
1045 | fd->next = NULL; |
1046 | fd->version = je32_to_cpu(rd->version); | |
1047 | fd->ino = je32_to_cpu(rd->ino); | |
1048 | fd->nhash = full_name_hash(fd->name, rd->nsize); | |
1049 | fd->type = rd->type; | |
1da177e4 LT |
1050 | jffs2_add_fd_to_list(c, fd, &ic->scan_dents); |
1051 | ||
e631ddba FH |
1052 | if (jffs2_sum_active()) { |
1053 | jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); | |
1054 | } | |
1055 | ||
1da177e4 LT |
1056 | return 0; |
1057 | } | |
1058 | ||
1059 | static int count_list(struct list_head *l) | |
1060 | { | |
1061 | uint32_t count = 0; | |
1062 | struct list_head *tmp; | |
1063 | ||
1064 | list_for_each(tmp, l) { | |
1065 | count++; | |
1066 | } | |
1067 | return count; | |
1068 | } | |
1069 | ||
1070 | /* Note: This breaks if list_empty(head). I don't care. You | |
1071 | might, if you copy this code and use it elsewhere :) */ | |
1072 | static void rotate_list(struct list_head *head, uint32_t count) | |
1073 | { | |
1074 | struct list_head *n = head->next; | |
1075 | ||
1076 | list_del(head); | |
1077 | while(count--) { | |
1078 | n = n->next; | |
1079 | } | |
1080 | list_add(head, n); | |
1081 | } | |
1082 | ||
1083 | void jffs2_rotate_lists(struct jffs2_sb_info *c) | |
1084 | { | |
1085 | uint32_t x; | |
1086 | uint32_t rotateby; | |
1087 | ||
1088 | x = count_list(&c->clean_list); | |
1089 | if (x) { | |
1090 | rotateby = pseudo_random % x; | |
1da177e4 | 1091 | rotate_list((&c->clean_list), rotateby); |
1da177e4 LT |
1092 | } |
1093 | ||
1094 | x = count_list(&c->very_dirty_list); | |
1095 | if (x) { | |
1096 | rotateby = pseudo_random % x; | |
1da177e4 | 1097 | rotate_list((&c->very_dirty_list), rotateby); |
1da177e4 LT |
1098 | } |
1099 | ||
1100 | x = count_list(&c->dirty_list); | |
1101 | if (x) { | |
1102 | rotateby = pseudo_random % x; | |
1da177e4 | 1103 | rotate_list((&c->dirty_list), rotateby); |
1da177e4 LT |
1104 | } |
1105 | ||
1106 | x = count_list(&c->erasable_list); | |
1107 | if (x) { | |
1108 | rotateby = pseudo_random % x; | |
1da177e4 | 1109 | rotate_list((&c->erasable_list), rotateby); |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | if (c->nr_erasing_blocks) { | |
1113 | rotateby = pseudo_random % c->nr_erasing_blocks; | |
1da177e4 | 1114 | rotate_list((&c->erase_pending_list), rotateby); |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | if (c->nr_free_blocks) { | |
1118 | rotateby = pseudo_random % c->nr_free_blocks; | |
1da177e4 | 1119 | rotate_list((&c->free_list), rotateby); |
1da177e4 LT |
1120 | } |
1121 | } |