ia64/linux-2.6.18-xen.hg

view fs/jffs2/summary.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
5 * Zoltan Sogor <weth@inf.u-szeged.hu>,
6 * Patrik Kluba <pajko@halom.u-szeged.hu>,
7 * University of Szeged, Hungary
8 * 2006 KaiGai Kohei <kaigai@ak.jp.nec.com>
9 *
10 * For licensing information, see the file 'LICENCE' in this directory.
11 *
12 * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $
13 *
14 */
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/slab.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/pagemap.h>
21 #include <linux/crc32.h>
22 #include <linux/compiler.h>
23 #include <linux/vmalloc.h>
24 #include "nodelist.h"
25 #include "debug.h"
27 int jffs2_sum_init(struct jffs2_sb_info *c)
28 {
29 c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
31 if (!c->summary) {
32 JFFS2_WARNING("Can't allocate memory for summary information!\n");
33 return -ENOMEM;
34 }
36 memset(c->summary, 0, sizeof(struct jffs2_summary));
38 c->summary->sum_buf = vmalloc(c->sector_size);
40 if (!c->summary->sum_buf) {
41 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
42 kfree(c->summary);
43 return -ENOMEM;
44 }
46 dbg_summary("returned successfully\n");
48 return 0;
49 }
51 void jffs2_sum_exit(struct jffs2_sb_info *c)
52 {
53 dbg_summary("called\n");
55 jffs2_sum_disable_collecting(c->summary);
57 vfree(c->summary->sum_buf);
58 c->summary->sum_buf = NULL;
60 kfree(c->summary);
61 c->summary = NULL;
62 }
64 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
65 {
66 if (!s->sum_list_head)
67 s->sum_list_head = (union jffs2_sum_mem *) item;
68 if (s->sum_list_tail)
69 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
70 s->sum_list_tail = (union jffs2_sum_mem *) item;
72 switch (je16_to_cpu(item->u.nodetype)) {
73 case JFFS2_NODETYPE_INODE:
74 s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
75 s->sum_num++;
76 dbg_summary("inode (%u) added to summary\n",
77 je32_to_cpu(item->i.inode));
78 break;
79 case JFFS2_NODETYPE_DIRENT:
80 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
81 s->sum_num++;
82 dbg_summary("dirent (%u) added to summary\n",
83 je32_to_cpu(item->d.ino));
84 break;
85 #ifdef CONFIG_JFFS2_FS_XATTR
86 case JFFS2_NODETYPE_XATTR:
87 s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
88 s->sum_num++;
89 dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
90 je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
91 break;
92 case JFFS2_NODETYPE_XREF:
93 s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
94 s->sum_num++;
95 dbg_summary("xref added to summary\n");
96 break;
97 #endif
98 default:
99 JFFS2_WARNING("UNKNOWN node type %u\n",
100 je16_to_cpu(item->u.nodetype));
101 return 1;
102 }
103 return 0;
104 }
107 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
109 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
110 {
111 dbg_summary("called with %u\n", size);
112 s->sum_padded += size;
113 return 0;
114 }
116 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
117 uint32_t ofs)
118 {
119 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
121 if (!temp)
122 return -ENOMEM;
124 temp->nodetype = ri->nodetype;
125 temp->inode = ri->ino;
126 temp->version = ri->version;
127 temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
128 temp->totlen = ri->totlen;
129 temp->next = NULL;
131 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
132 }
134 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
135 uint32_t ofs)
136 {
137 struct jffs2_sum_dirent_mem *temp =
138 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
140 if (!temp)
141 return -ENOMEM;
143 temp->nodetype = rd->nodetype;
144 temp->totlen = rd->totlen;
145 temp->offset = cpu_to_je32(ofs); /* relative from the begining of the jeb */
146 temp->pino = rd->pino;
147 temp->version = rd->version;
148 temp->ino = rd->ino;
149 temp->nsize = rd->nsize;
150 temp->type = rd->type;
151 temp->next = NULL;
153 memcpy(temp->name, rd->name, rd->nsize);
155 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
156 }
158 #ifdef CONFIG_JFFS2_FS_XATTR
159 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
160 {
161 struct jffs2_sum_xattr_mem *temp;
163 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
164 if (!temp)
165 return -ENOMEM;
167 temp->nodetype = rx->nodetype;
168 temp->xid = rx->xid;
169 temp->version = rx->version;
170 temp->offset = cpu_to_je32(ofs);
171 temp->totlen = rx->totlen;
172 temp->next = NULL;
174 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
175 }
177 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
178 {
179 struct jffs2_sum_xref_mem *temp;
181 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
182 if (!temp)
183 return -ENOMEM;
185 temp->nodetype = rr->nodetype;
186 temp->offset = cpu_to_je32(ofs);
187 temp->next = NULL;
189 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
190 }
191 #endif
192 /* Cleanup every collected summary information */
194 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
195 {
196 union jffs2_sum_mem *temp;
198 if (!s->sum_list_head) {
199 dbg_summary("already empty\n");
200 }
201 while (s->sum_list_head) {
202 temp = s->sum_list_head;
203 s->sum_list_head = s->sum_list_head->u.next;
204 kfree(temp);
205 }
206 s->sum_list_tail = NULL;
207 s->sum_padded = 0;
208 s->sum_num = 0;
209 }
211 void jffs2_sum_reset_collected(struct jffs2_summary *s)
212 {
213 dbg_summary("called\n");
214 jffs2_sum_clean_collected(s);
215 s->sum_size = 0;
216 }
218 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
219 {
220 dbg_summary("called\n");
221 jffs2_sum_clean_collected(s);
222 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
223 }
225 int jffs2_sum_is_disabled(struct jffs2_summary *s)
226 {
227 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
228 }
230 /* Move the collected summary information into sb (called from scan.c) */
232 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
233 {
234 dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
235 c->summary->sum_size, c->summary->sum_num,
236 s->sum_size, s->sum_num);
238 c->summary->sum_size = s->sum_size;
239 c->summary->sum_num = s->sum_num;
240 c->summary->sum_padded = s->sum_padded;
241 c->summary->sum_list_head = s->sum_list_head;
242 c->summary->sum_list_tail = s->sum_list_tail;
244 s->sum_list_head = s->sum_list_tail = NULL;
245 }
247 /* Called from wbuf.c to collect writed node info */
249 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
250 unsigned long count, uint32_t ofs)
251 {
252 union jffs2_node_union *node;
253 struct jffs2_eraseblock *jeb;
255 if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
256 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
257 return 0;
258 }
260 node = invecs[0].iov_base;
261 jeb = &c->blocks[ofs / c->sector_size];
262 ofs -= jeb->offset;
264 switch (je16_to_cpu(node->u.nodetype)) {
265 case JFFS2_NODETYPE_INODE: {
266 struct jffs2_sum_inode_mem *temp =
267 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
269 if (!temp)
270 goto no_mem;
272 temp->nodetype = node->i.nodetype;
273 temp->inode = node->i.ino;
274 temp->version = node->i.version;
275 temp->offset = cpu_to_je32(ofs);
276 temp->totlen = node->i.totlen;
277 temp->next = NULL;
279 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
280 }
282 case JFFS2_NODETYPE_DIRENT: {
283 struct jffs2_sum_dirent_mem *temp =
284 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
286 if (!temp)
287 goto no_mem;
289 temp->nodetype = node->d.nodetype;
290 temp->totlen = node->d.totlen;
291 temp->offset = cpu_to_je32(ofs);
292 temp->pino = node->d.pino;
293 temp->version = node->d.version;
294 temp->ino = node->d.ino;
295 temp->nsize = node->d.nsize;
296 temp->type = node->d.type;
297 temp->next = NULL;
299 switch (count) {
300 case 1:
301 memcpy(temp->name,node->d.name,node->d.nsize);
302 break;
304 case 2:
305 memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
306 break;
308 default:
309 BUG(); /* impossible count value */
310 break;
311 }
313 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
314 }
315 #ifdef CONFIG_JFFS2_FS_XATTR
316 case JFFS2_NODETYPE_XATTR: {
317 struct jffs2_sum_xattr_mem *temp;
318 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
319 if (!temp)
320 goto no_mem;
322 temp->nodetype = node->x.nodetype;
323 temp->xid = node->x.xid;
324 temp->version = node->x.version;
325 temp->totlen = node->x.totlen;
326 temp->offset = cpu_to_je32(ofs);
327 temp->next = NULL;
329 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
330 }
331 case JFFS2_NODETYPE_XREF: {
332 struct jffs2_sum_xref_mem *temp;
333 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
334 if (!temp)
335 goto no_mem;
336 temp->nodetype = node->r.nodetype;
337 temp->offset = cpu_to_je32(ofs);
338 temp->next = NULL;
340 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
341 }
342 #endif
343 case JFFS2_NODETYPE_PADDING:
344 dbg_summary("node PADDING\n");
345 c->summary->sum_padded += je32_to_cpu(node->u.totlen);
346 break;
348 case JFFS2_NODETYPE_CLEANMARKER:
349 dbg_summary("node CLEANMARKER\n");
350 break;
352 case JFFS2_NODETYPE_SUMMARY:
353 dbg_summary("node SUMMARY\n");
354 break;
356 default:
357 /* If you implement a new node type you should also implement
358 summary support for it or disable summary.
359 */
360 BUG();
361 break;
362 }
364 return 0;
366 no_mem:
367 JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
368 return -ENOMEM;
369 }
371 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
372 struct jffs2_eraseblock *jeb,
373 uint32_t ofs, uint32_t len,
374 struct jffs2_inode_cache *ic)
375 {
376 /* If there was a gap, mark it dirty */
377 if ((ofs & ~3) > c->sector_size - jeb->free_size) {
378 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
379 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
380 }
382 return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
383 }
385 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
387 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
388 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
389 {
390 struct jffs2_inode_cache *ic;
391 struct jffs2_full_dirent *fd;
392 void *sp;
393 int i, ino;
394 int err;
396 sp = summary->sum;
398 for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
399 dbg_summary("processing summary index %d\n", i);
401 /* Make sure there's a spare ref for dirty space */
402 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
403 if (err)
404 return err;
406 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
407 case JFFS2_NODETYPE_INODE: {
408 struct jffs2_sum_inode_flash *spi;
409 spi = sp;
411 ino = je32_to_cpu(spi->inode);
413 dbg_summary("Inode at 0x%08x-0x%08x\n",
414 jeb->offset + je32_to_cpu(spi->offset),
415 jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
417 ic = jffs2_scan_make_ino_cache(c, ino);
418 if (!ic) {
419 JFFS2_NOTICE("scan_make_ino_cache failed\n");
420 return -ENOMEM;
421 }
423 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
424 PAD(je32_to_cpu(spi->totlen)), ic);
426 *pseudo_random += je32_to_cpu(spi->version);
428 sp += JFFS2_SUMMARY_INODE_SIZE;
430 break;
431 }
433 case JFFS2_NODETYPE_DIRENT: {
434 struct jffs2_sum_dirent_flash *spd;
435 spd = sp;
437 dbg_summary("Dirent at 0x%08x-0x%08x\n",
438 jeb->offset + je32_to_cpu(spd->offset),
439 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
442 fd = jffs2_alloc_full_dirent(spd->nsize+1);
443 if (!fd)
444 return -ENOMEM;
446 memcpy(&fd->name, spd->name, spd->nsize);
447 fd->name[spd->nsize] = 0;
449 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
450 if (!ic) {
451 jffs2_free_full_dirent(fd);
452 return -ENOMEM;
453 }
455 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED,
456 PAD(je32_to_cpu(spd->totlen)), ic);
458 fd->next = NULL;
459 fd->version = je32_to_cpu(spd->version);
460 fd->ino = je32_to_cpu(spd->ino);
461 fd->nhash = full_name_hash(fd->name, spd->nsize);
462 fd->type = spd->type;
464 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
466 *pseudo_random += je32_to_cpu(spd->version);
468 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
470 break;
471 }
472 #ifdef CONFIG_JFFS2_FS_XATTR
473 case JFFS2_NODETYPE_XATTR: {
474 struct jffs2_xattr_datum *xd;
475 struct jffs2_sum_xattr_flash *spx;
477 spx = (struct jffs2_sum_xattr_flash *)sp;
478 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
479 jeb->offset + je32_to_cpu(spx->offset),
480 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
481 je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
483 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
484 je32_to_cpu(spx->version));
485 if (IS_ERR(xd))
486 return PTR_ERR(xd);
487 if (xd->version > je32_to_cpu(spx->version)) {
488 /* node is not the newest one */
489 struct jffs2_raw_node_ref *raw
490 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
491 PAD(je32_to_cpu(spx->totlen)), NULL);
492 raw->next_in_ino = xd->node->next_in_ino;
493 xd->node->next_in_ino = raw;
494 } else {
495 xd->version = je32_to_cpu(spx->version);
496 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
497 PAD(je32_to_cpu(spx->totlen)), (void *)xd);
498 }
499 *pseudo_random += je32_to_cpu(spx->xid);
500 sp += JFFS2_SUMMARY_XATTR_SIZE;
502 break;
503 }
504 case JFFS2_NODETYPE_XREF: {
505 struct jffs2_xattr_ref *ref;
506 struct jffs2_sum_xref_flash *spr;
508 spr = (struct jffs2_sum_xref_flash *)sp;
509 dbg_summary("xref at %#08x-%#08x\n",
510 jeb->offset + je32_to_cpu(spr->offset),
511 jeb->offset + je32_to_cpu(spr->offset) +
512 (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
514 ref = jffs2_alloc_xattr_ref();
515 if (!ref) {
516 JFFS2_NOTICE("allocation of xattr_datum failed\n");
517 return -ENOMEM;
518 }
519 ref->next = c->xref_temp;
520 c->xref_temp = ref;
522 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
523 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
525 *pseudo_random += ref->node->flash_offset;
526 sp += JFFS2_SUMMARY_XREF_SIZE;
528 break;
529 }
530 #endif
531 default : {
532 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
533 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
534 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
535 return -EIO;
537 /* For compatible node types, just fall back to the full scan */
538 c->wasted_size -= jeb->wasted_size;
539 c->free_size += c->sector_size - jeb->free_size;
540 c->used_size -= jeb->used_size;
541 c->dirty_size -= jeb->dirty_size;
542 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
543 jeb->free_size = c->sector_size;
545 jffs2_free_jeb_node_refs(c, jeb);
546 return -ENOTRECOVERABLE;
547 }
548 }
549 }
550 return 0;
551 }
553 /* Process the summary node - called from jffs2_scan_eraseblock() */
554 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
555 struct jffs2_raw_summary *summary, uint32_t sumsize,
556 uint32_t *pseudo_random)
557 {
558 struct jffs2_unknown_node crcnode;
559 int ret, ofs;
560 uint32_t crc;
562 ofs = c->sector_size - sumsize;
564 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
565 jeb->offset, jeb->offset + ofs, sumsize);
567 /* OK, now check for node validity and CRC */
568 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
569 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
570 crcnode.totlen = summary->totlen;
571 crc = crc32(0, &crcnode, sizeof(crcnode)-4);
573 if (je32_to_cpu(summary->hdr_crc) != crc) {
574 dbg_summary("Summary node header is corrupt (bad CRC or "
575 "no summary at all)\n");
576 goto crc_err;
577 }
579 if (je32_to_cpu(summary->totlen) != sumsize) {
580 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
581 goto crc_err;
582 }
584 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
586 if (je32_to_cpu(summary->node_crc) != crc) {
587 dbg_summary("Summary node is corrupt (bad CRC)\n");
588 goto crc_err;
589 }
591 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
593 if (je32_to_cpu(summary->sum_crc) != crc) {
594 dbg_summary("Summary node data is corrupt (bad CRC)\n");
595 goto crc_err;
596 }
598 if ( je32_to_cpu(summary->cln_mkr) ) {
600 dbg_summary("Summary : CLEANMARKER node \n");
602 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
603 if (ret)
604 return ret;
606 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
607 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
608 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
609 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
610 return ret;
611 } else if (jeb->first_node) {
612 dbg_summary("CLEANMARKER node not first node in block "
613 "(0x%08x)\n", jeb->offset);
614 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
615 return ret;
616 } else {
617 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
618 je32_to_cpu(summary->cln_mkr), NULL);
619 }
620 }
622 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
623 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
624 scan of this eraseblock. So return zero */
625 if (ret == -ENOTRECOVERABLE)
626 return 0;
627 if (ret)
628 return ret; /* real error */
630 /* for PARANOIA_CHECK */
631 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
632 if (ret)
633 return ret;
635 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
637 if (unlikely(jeb->free_size)) {
638 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
639 jeb->free_size, jeb->offset);
640 jeb->wasted_size += jeb->free_size;
641 c->wasted_size += jeb->free_size;
642 c->free_size -= jeb->free_size;
643 jeb->free_size = 0;
644 }
646 return jffs2_scan_classify_jeb(c, jeb);
648 crc_err:
649 JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
651 return 0;
652 }
654 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
656 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
657 uint32_t infosize, uint32_t datasize, int padsize)
658 {
659 struct jffs2_raw_summary isum;
660 union jffs2_sum_mem *temp;
661 struct jffs2_sum_marker *sm;
662 struct kvec vecs[2];
663 uint32_t sum_ofs;
664 void *wpage;
665 int ret;
666 size_t retlen;
668 memset(c->summary->sum_buf, 0xff, datasize);
669 memset(&isum, 0, sizeof(isum));
671 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
672 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
673 isum.totlen = cpu_to_je32(infosize);
674 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
675 isum.padded = cpu_to_je32(c->summary->sum_padded);
676 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
677 isum.sum_num = cpu_to_je32(c->summary->sum_num);
678 wpage = c->summary->sum_buf;
680 while (c->summary->sum_num) {
681 temp = c->summary->sum_list_head;
683 switch (je16_to_cpu(temp->u.nodetype)) {
684 case JFFS2_NODETYPE_INODE: {
685 struct jffs2_sum_inode_flash *sino_ptr = wpage;
687 sino_ptr->nodetype = temp->i.nodetype;
688 sino_ptr->inode = temp->i.inode;
689 sino_ptr->version = temp->i.version;
690 sino_ptr->offset = temp->i.offset;
691 sino_ptr->totlen = temp->i.totlen;
693 wpage += JFFS2_SUMMARY_INODE_SIZE;
695 break;
696 }
698 case JFFS2_NODETYPE_DIRENT: {
699 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
701 sdrnt_ptr->nodetype = temp->d.nodetype;
702 sdrnt_ptr->totlen = temp->d.totlen;
703 sdrnt_ptr->offset = temp->d.offset;
704 sdrnt_ptr->pino = temp->d.pino;
705 sdrnt_ptr->version = temp->d.version;
706 sdrnt_ptr->ino = temp->d.ino;
707 sdrnt_ptr->nsize = temp->d.nsize;
708 sdrnt_ptr->type = temp->d.type;
710 memcpy(sdrnt_ptr->name, temp->d.name,
711 temp->d.nsize);
713 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
715 break;
716 }
717 #ifdef CONFIG_JFFS2_FS_XATTR
718 case JFFS2_NODETYPE_XATTR: {
719 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
721 temp = c->summary->sum_list_head;
722 sxattr_ptr->nodetype = temp->x.nodetype;
723 sxattr_ptr->xid = temp->x.xid;
724 sxattr_ptr->version = temp->x.version;
725 sxattr_ptr->offset = temp->x.offset;
726 sxattr_ptr->totlen = temp->x.totlen;
728 wpage += JFFS2_SUMMARY_XATTR_SIZE;
729 break;
730 }
731 case JFFS2_NODETYPE_XREF: {
732 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
734 temp = c->summary->sum_list_head;
735 sxref_ptr->nodetype = temp->r.nodetype;
736 sxref_ptr->offset = temp->r.offset;
738 wpage += JFFS2_SUMMARY_XREF_SIZE;
739 break;
740 }
741 #endif
742 default : {
743 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
744 == JFFS2_FEATURE_RWCOMPAT_COPY) {
745 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
746 je16_to_cpu(temp->u.nodetype));
747 jffs2_sum_disable_collecting(c->summary);
748 } else {
749 BUG(); /* unknown node in summary information */
750 }
751 }
752 }
754 c->summary->sum_list_head = temp->u.next;
755 kfree(temp);
757 c->summary->sum_num--;
758 }
760 jffs2_sum_reset_collected(c->summary);
762 wpage += padsize;
764 sm = wpage;
765 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
766 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
768 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
769 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
771 vecs[0].iov_base = &isum;
772 vecs[0].iov_len = sizeof(isum);
773 vecs[1].iov_base = c->summary->sum_buf;
774 vecs[1].iov_len = datasize;
776 sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
778 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
779 sum_ofs);
781 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
783 if (ret || (retlen != infosize)) {
785 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
786 infosize, sum_ofs, ret, retlen);
788 if (retlen) {
789 /* Waste remaining space */
790 spin_lock(&c->erase_completion_lock);
791 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
792 spin_unlock(&c->erase_completion_lock);
793 }
795 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
797 return 0;
798 }
800 spin_lock(&c->erase_completion_lock);
801 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
802 spin_unlock(&c->erase_completion_lock);
804 return 0;
805 }
807 /* Write out summary information - called from jffs2_do_reserve_space */
809 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
810 {
811 int datasize, infosize, padsize;
812 struct jffs2_eraseblock *jeb;
813 int ret;
815 dbg_summary("called\n");
817 spin_unlock(&c->erase_completion_lock);
819 jeb = c->nextblock;
820 jffs2_prealloc_raw_node_refs(c, jeb, 1);
822 if (!c->summary->sum_num || !c->summary->sum_list_head) {
823 JFFS2_WARNING("Empty summary info!!!\n");
824 BUG();
825 }
827 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
828 infosize = sizeof(struct jffs2_raw_summary) + datasize;
829 padsize = jeb->free_size - infosize;
830 infosize += padsize;
831 datasize += padsize;
833 /* Is there enough space for summary? */
834 if (padsize < 0) {
835 /* don't try to write out summary for this jeb */
836 jffs2_sum_disable_collecting(c->summary);
838 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
839 spin_lock(&c->erase_completion_lock);
840 return 0;
841 }
843 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
844 spin_lock(&c->erase_completion_lock);
845 return ret;
846 }