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