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Linux/fs/jffs2/summary.c

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  1 /*
  2  * JFFS2 -- Journalling Flash File System, Version 2.
  3  *
  4  * Copyright © 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  */
 13 
 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/slab.h>
 18 #include <linux/mtd/mtd.h>
 19 #include <linux/pagemap.h>
 20 #include <linux/crc32.h>
 21 #include <linux/compiler.h>
 22 #include <linux/vmalloc.h>
 23 #include "nodelist.h"
 24 #include "debug.h"
 25 
 26 int jffs2_sum_init(struct jffs2_sb_info *c)
 27 {
 28         uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
 29 
 30         c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
 31 
 32         if (!c->summary) {
 33                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
 34                 return -ENOMEM;
 35         }
 36 
 37         c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL);
 38 
 39         if (!c->summary->sum_buf) {
 40                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
 41                 kfree(c->summary);
 42                 return -ENOMEM;
 43         }
 44 
 45         dbg_summary("returned successfully\n");
 46 
 47         return 0;
 48 }
 49 
 50 void jffs2_sum_exit(struct jffs2_sb_info *c)
 51 {
 52         dbg_summary("called\n");
 53 
 54         jffs2_sum_disable_collecting(c->summary);
 55 
 56         kfree(c->summary->sum_buf);
 57         c->summary->sum_buf = NULL;
 58 
 59         kfree(c->summary);
 60         c->summary = NULL;
 61 }
 62 
 63 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
 64 {
 65         if (!s->sum_list_head)
 66                 s->sum_list_head = (union jffs2_sum_mem *) item;
 67         if (s->sum_list_tail)
 68                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
 69         s->sum_list_tail = (union jffs2_sum_mem *) item;
 70 
 71         switch (je16_to_cpu(item->u.nodetype)) {
 72                 case JFFS2_NODETYPE_INODE:
 73                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
 74                         s->sum_num++;
 75                         dbg_summary("inode (%u) added to summary\n",
 76                                                 je32_to_cpu(item->i.inode));
 77                         break;
 78                 case JFFS2_NODETYPE_DIRENT:
 79                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
 80                         s->sum_num++;
 81                         dbg_summary("dirent (%u) added to summary\n",
 82                                                 je32_to_cpu(item->d.ino));
 83                         break;
 84 #ifdef CONFIG_JFFS2_FS_XATTR
 85                 case JFFS2_NODETYPE_XATTR:
 86                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
 87                         s->sum_num++;
 88                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
 89                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
 90                         break;
 91                 case JFFS2_NODETYPE_XREF:
 92                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
 93                         s->sum_num++;
 94                         dbg_summary("xref added to summary\n");
 95                         break;
 96 #endif
 97                 default:
 98                         JFFS2_WARNING("UNKNOWN node type %u\n",
 99                                             je16_to_cpu(item->u.nodetype));
100                         return 1;
101         }
102         return 0;
103 }
104 
105 
106 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
107 
108 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
109 {
110         dbg_summary("called with %u\n", size);
111         s->sum_padded += size;
112         return 0;
113 }
114 
115 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
116                                 uint32_t ofs)
117 {
118         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
119 
120         if (!temp)
121                 return -ENOMEM;
122 
123         temp->nodetype = ri->nodetype;
124         temp->inode = ri->ino;
125         temp->version = ri->version;
126         temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */
127         temp->totlen = ri->totlen;
128         temp->next = NULL;
129 
130         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
131 }
132 
133 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
134                                 uint32_t ofs)
135 {
136         struct jffs2_sum_dirent_mem *temp =
137                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
138 
139         if (!temp)
140                 return -ENOMEM;
141 
142         temp->nodetype = rd->nodetype;
143         temp->totlen = rd->totlen;
144         temp->offset = cpu_to_je32(ofs);        /* relative from the beginning of the jeb */
145         temp->pino = rd->pino;
146         temp->version = rd->version;
147         temp->ino = rd->ino;
148         temp->nsize = rd->nsize;
149         temp->type = rd->type;
150         temp->next = NULL;
151 
152         memcpy(temp->name, rd->name, rd->nsize);
153 
154         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
155 }
156 
157 #ifdef CONFIG_JFFS2_FS_XATTR
158 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
159 {
160         struct jffs2_sum_xattr_mem *temp;
161 
162         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
163         if (!temp)
164                 return -ENOMEM;
165 
166         temp->nodetype = rx->nodetype;
167         temp->xid = rx->xid;
168         temp->version = rx->version;
169         temp->offset = cpu_to_je32(ofs);
170         temp->totlen = rx->totlen;
171         temp->next = NULL;
172 
173         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
174 }
175 
176 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
177 {
178         struct jffs2_sum_xref_mem *temp;
179 
180         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
181         if (!temp)
182                 return -ENOMEM;
183 
184         temp->nodetype = rr->nodetype;
185         temp->offset = cpu_to_je32(ofs);
186         temp->next = NULL;
187 
188         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
189 }
190 #endif
191 /* Cleanup every collected summary information */
192 
193 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
194 {
195         union jffs2_sum_mem *temp;
196 
197         if (!s->sum_list_head) {
198                 dbg_summary("already empty\n");
199         }
200         while (s->sum_list_head) {
201                 temp = s->sum_list_head;
202                 s->sum_list_head = s->sum_list_head->u.next;
203                 kfree(temp);
204         }
205         s->sum_list_tail = NULL;
206         s->sum_padded = 0;
207         s->sum_num = 0;
208 }
209 
210 void jffs2_sum_reset_collected(struct jffs2_summary *s)
211 {
212         dbg_summary("called\n");
213         jffs2_sum_clean_collected(s);
214         s->sum_size = 0;
215 }
216 
217 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
218 {
219         dbg_summary("called\n");
220         jffs2_sum_clean_collected(s);
221         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
222 }
223 
224 int jffs2_sum_is_disabled(struct jffs2_summary *s)
225 {
226         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
227 }
228 
229 /* Move the collected summary information into sb (called from scan.c) */
230 
231 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
232 {
233         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
234                                 c->summary->sum_size, c->summary->sum_num,
235                                 s->sum_size, s->sum_num);
236 
237         c->summary->sum_size = s->sum_size;
238         c->summary->sum_num = s->sum_num;
239         c->summary->sum_padded = s->sum_padded;
240         c->summary->sum_list_head = s->sum_list_head;
241         c->summary->sum_list_tail = s->sum_list_tail;
242 
243         s->sum_list_head = s->sum_list_tail = NULL;
244 }
245 
246 /* Called from wbuf.c to collect writed node info */
247 
248 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
249                                 unsigned long count, uint32_t ofs)
250 {
251         union jffs2_node_union *node;
252         struct jffs2_eraseblock *jeb;
253 
254         if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
255                 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
256                 return 0;
257         }
258 
259         node = invecs[0].iov_base;
260         jeb = &c->blocks[ofs / c->sector_size];
261         ofs -= jeb->offset;
262 
263         switch (je16_to_cpu(node->u.nodetype)) {
264                 case JFFS2_NODETYPE_INODE: {
265                         struct jffs2_sum_inode_mem *temp =
266                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
267 
268                         if (!temp)
269                                 goto no_mem;
270 
271                         temp->nodetype = node->i.nodetype;
272                         temp->inode = node->i.ino;
273                         temp->version = node->i.version;
274                         temp->offset = cpu_to_je32(ofs);
275                         temp->totlen = node->i.totlen;
276                         temp->next = NULL;
277 
278                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
279                 }
280 
281                 case JFFS2_NODETYPE_DIRENT: {
282                         struct jffs2_sum_dirent_mem *temp =
283                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
284 
285                         if (!temp)
286                                 goto no_mem;
287 
288                         temp->nodetype = node->d.nodetype;
289                         temp->totlen = node->d.totlen;
290                         temp->offset = cpu_to_je32(ofs);
291                         temp->pino = node->d.pino;
292                         temp->version = node->d.version;
293                         temp->ino = node->d.ino;
294                         temp->nsize = node->d.nsize;
295                         temp->type = node->d.type;
296                         temp->next = NULL;
297 
298                         switch (count) {
299                                 case 1:
300                                         memcpy(temp->name,node->d.name,node->d.nsize);
301                                         break;
302 
303                                 case 2:
304                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
305                                         break;
306 
307                                 default:
308                                         BUG();  /* impossible count value */
309                                         break;
310                         }
311 
312                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
313                 }
314 #ifdef CONFIG_JFFS2_FS_XATTR
315                 case JFFS2_NODETYPE_XATTR: {
316                         struct jffs2_sum_xattr_mem *temp;
317                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
318                         if (!temp)
319                                 goto no_mem;
320 
321                         temp->nodetype = node->x.nodetype;
322                         temp->xid = node->x.xid;
323                         temp->version = node->x.version;
324                         temp->totlen = node->x.totlen;
325                         temp->offset = cpu_to_je32(ofs);
326                         temp->next = NULL;
327 
328                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
329                 }
330                 case JFFS2_NODETYPE_XREF: {
331                         struct jffs2_sum_xref_mem *temp;
332                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
333                         if (!temp)
334                                 goto no_mem;
335                         temp->nodetype = node->r.nodetype;
336                         temp->offset = cpu_to_je32(ofs);
337                         temp->next = NULL;
338 
339                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
340                 }
341 #endif
342                 case JFFS2_NODETYPE_PADDING:
343                         dbg_summary("node PADDING\n");
344                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
345                         break;
346 
347                 case JFFS2_NODETYPE_CLEANMARKER:
348                         dbg_summary("node CLEANMARKER\n");
349                         break;
350 
351                 case JFFS2_NODETYPE_SUMMARY:
352                         dbg_summary("node SUMMARY\n");
353                         break;
354 
355                 default:
356                         /* If you implement a new node type you should also implement
357                            summary support for it or disable summary.
358                         */
359                         BUG();
360                         break;
361         }
362 
363         return 0;
364 
365 no_mem:
366         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
367         return -ENOMEM;
368 }
369 
370 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
371                                                     struct jffs2_eraseblock *jeb,
372                                                     uint32_t ofs, uint32_t len,
373                                                     struct jffs2_inode_cache *ic)
374 {
375         /* If there was a gap, mark it dirty */
376         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
377                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
378                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
379         }
380 
381         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
382 }
383 
384 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
385 
386 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
387                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
388 {
389         struct jffs2_inode_cache *ic;
390         struct jffs2_full_dirent *fd;
391         void *sp;
392         int i, ino;
393         int err;
394 
395         sp = summary->sum;
396 
397         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
398                 dbg_summary("processing summary index %d\n", i);
399 
400                 cond_resched();
401 
402                 /* Make sure there's a spare ref for dirty space */
403                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
404                 if (err)
405                         return err;
406 
407                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
408                         case JFFS2_NODETYPE_INODE: {
409                                 struct jffs2_sum_inode_flash *spi;
410                                 spi = sp;
411 
412                                 ino = je32_to_cpu(spi->inode);
413 
414                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
415                                             jeb->offset + je32_to_cpu(spi->offset),
416                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
417 
418                                 ic = jffs2_scan_make_ino_cache(c, ino);
419                                 if (!ic) {
420                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
421                                         return -ENOMEM;
422                                 }
423 
424                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
425                                                   PAD(je32_to_cpu(spi->totlen)), ic);
426 
427                                 *pseudo_random += je32_to_cpu(spi->version);
428 
429                                 sp += JFFS2_SUMMARY_INODE_SIZE;
430 
431                                 break;
432                         }
433 
434                         case JFFS2_NODETYPE_DIRENT: {
435                                 struct jffs2_sum_dirent_flash *spd;
436                                 int checkedlen;
437                                 spd = sp;
438 
439                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
440                                             jeb->offset + je32_to_cpu(spd->offset),
441                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
442 
443 
444                                 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
445                                 checkedlen = strnlen(spd->name, spd->nsize);
446                                 if (!checkedlen) {
447                                         pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n",
448                                                jeb->offset +
449                                                je32_to_cpu(spd->offset));
450                                         return -EIO;
451                                 }
452                                 if (checkedlen < spd->nsize) {
453                                         pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n",
454                                                jeb->offset +
455                                                je32_to_cpu(spd->offset),
456                                                checkedlen);
457                                 }
458 
459 
460                                 fd = jffs2_alloc_full_dirent(checkedlen+1);
461                                 if (!fd)
462                                         return -ENOMEM;
463 
464                                 memcpy(&fd->name, spd->name, checkedlen);
465                                 fd->name[checkedlen] = 0;
466 
467                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
468                                 if (!ic) {
469                                         jffs2_free_full_dirent(fd);
470                                         return -ENOMEM;
471                                 }
472 
473                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
474                                                             PAD(je32_to_cpu(spd->totlen)), ic);
475 
476                                 fd->next = NULL;
477                                 fd->version = je32_to_cpu(spd->version);
478                                 fd->ino = je32_to_cpu(spd->ino);
479                                 fd->nhash = full_name_hash(NULL, fd->name, checkedlen);
480                                 fd->type = spd->type;
481 
482                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
483 
484                                 *pseudo_random += je32_to_cpu(spd->version);
485 
486                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
487 
488                                 break;
489                         }
490 #ifdef CONFIG_JFFS2_FS_XATTR
491                         case JFFS2_NODETYPE_XATTR: {
492                                 struct jffs2_xattr_datum *xd;
493                                 struct jffs2_sum_xattr_flash *spx;
494 
495                                 spx = (struct jffs2_sum_xattr_flash *)sp;
496                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 
497                                             jeb->offset + je32_to_cpu(spx->offset),
498                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
499                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
500 
501                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
502                                                                 je32_to_cpu(spx->version));
503                                 if (IS_ERR(xd))
504                                         return PTR_ERR(xd);
505                                 if (xd->version > je32_to_cpu(spx->version)) {
506                                         /* node is not the newest one */
507                                         struct jffs2_raw_node_ref *raw
508                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
509                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
510                                         raw->next_in_ino = xd->node->next_in_ino;
511                                         xd->node->next_in_ino = raw;
512                                 } else {
513                                         xd->version = je32_to_cpu(spx->version);
514                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
515                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
516                                 }
517                                 *pseudo_random += je32_to_cpu(spx->xid);
518                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
519 
520                                 break;
521                         }
522                         case JFFS2_NODETYPE_XREF: {
523                                 struct jffs2_xattr_ref *ref;
524                                 struct jffs2_sum_xref_flash *spr;
525 
526                                 spr = (struct jffs2_sum_xref_flash *)sp;
527                                 dbg_summary("xref at %#08x-%#08x\n",
528                                             jeb->offset + je32_to_cpu(spr->offset),
529                                             jeb->offset + je32_to_cpu(spr->offset) + 
530                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
531 
532                                 ref = jffs2_alloc_xattr_ref();
533                                 if (!ref) {
534                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
535                                         return -ENOMEM;
536                                 }
537                                 ref->next = c->xref_temp;
538                                 c->xref_temp = ref;
539 
540                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
541                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
542 
543                                 *pseudo_random += ref->node->flash_offset;
544                                 sp += JFFS2_SUMMARY_XREF_SIZE;
545 
546                                 break;
547                         }
548 #endif
549                         default : {
550                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
551                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
552                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
553                                         return -EIO;
554 
555                                 /* For compatible node types, just fall back to the full scan */
556                                 c->wasted_size -= jeb->wasted_size;
557                                 c->free_size += c->sector_size - jeb->free_size;
558                                 c->used_size -= jeb->used_size;
559                                 c->dirty_size -= jeb->dirty_size;
560                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
561                                 jeb->free_size = c->sector_size;
562 
563                                 jffs2_free_jeb_node_refs(c, jeb);
564                                 return -ENOTRECOVERABLE;
565                         }
566                 }
567         }
568         return 0;
569 }
570 
571 /* Process the summary node - called from jffs2_scan_eraseblock() */
572 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
573                            struct jffs2_raw_summary *summary, uint32_t sumsize,
574                            uint32_t *pseudo_random)
575 {
576         struct jffs2_unknown_node crcnode;
577         int ret, ofs;
578         uint32_t crc;
579 
580         ofs = c->sector_size - sumsize;
581 
582         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
583                     jeb->offset, jeb->offset + ofs, sumsize);
584 
585         /* OK, now check for node validity and CRC */
586         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
587         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
588         crcnode.totlen = summary->totlen;
589         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
590 
591         if (je32_to_cpu(summary->hdr_crc) != crc) {
592                 dbg_summary("Summary node header is corrupt (bad CRC or "
593                                 "no summary at all)\n");
594                 goto crc_err;
595         }
596 
597         if (je32_to_cpu(summary->totlen) != sumsize) {
598                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
599                 goto crc_err;
600         }
601 
602         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
603 
604         if (je32_to_cpu(summary->node_crc) != crc) {
605                 dbg_summary("Summary node is corrupt (bad CRC)\n");
606                 goto crc_err;
607         }
608 
609         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
610 
611         if (je32_to_cpu(summary->sum_crc) != crc) {
612                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
613                 goto crc_err;
614         }
615 
616         if ( je32_to_cpu(summary->cln_mkr) ) {
617 
618                 dbg_summary("Summary : CLEANMARKER node \n");
619 
620                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
621                 if (ret)
622                         return ret;
623 
624                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
625                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
626                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
627                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
628                                 return ret;
629                 } else if (jeb->first_node) {
630                         dbg_summary("CLEANMARKER node not first node in block "
631                                         "(0x%08x)\n", jeb->offset);
632                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
633                                 return ret;
634                 } else {
635                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
636                                             je32_to_cpu(summary->cln_mkr), NULL);
637                 }
638         }
639 
640         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
641         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
642            scan of this eraseblock. So return zero */
643         if (ret == -ENOTRECOVERABLE)
644                 return 0;
645         if (ret)
646                 return ret;             /* real error */
647 
648         /* for PARANOIA_CHECK */
649         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
650         if (ret)
651                 return ret;
652 
653         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
654 
655         if (unlikely(jeb->free_size)) {
656                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
657                               jeb->free_size, jeb->offset);
658                 jeb->wasted_size += jeb->free_size;
659                 c->wasted_size += jeb->free_size;
660                 c->free_size -= jeb->free_size;
661                 jeb->free_size = 0;
662         }
663 
664         return jffs2_scan_classify_jeb(c, jeb);
665 
666 crc_err:
667         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
668 
669         return 0;
670 }
671 
672 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
673 
674 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
675                                 uint32_t infosize, uint32_t datasize, int padsize)
676 {
677         struct jffs2_raw_summary isum;
678         union jffs2_sum_mem *temp;
679         struct jffs2_sum_marker *sm;
680         struct kvec vecs[2];
681         uint32_t sum_ofs;
682         void *wpage;
683         int ret;
684         size_t retlen;
685 
686         if (padsize + datasize > MAX_SUMMARY_SIZE) {
687                 /* It won't fit in the buffer. Abort summary for this jeb */
688                 jffs2_sum_disable_collecting(c->summary);
689 
690                 JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
691                               datasize, padsize, jeb->offset);
692                 /* Non-fatal */
693                 return 0;
694         }
695         /* Is there enough space for summary? */
696         if (padsize < 0) {
697                 /* don't try to write out summary for this jeb */
698                 jffs2_sum_disable_collecting(c->summary);
699 
700                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
701                               padsize);
702                 /* Non-fatal */
703                 return 0;
704         }
705 
706         memset(c->summary->sum_buf, 0xff, datasize);
707         memset(&isum, 0, sizeof(isum));
708 
709         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
710         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
711         isum.totlen = cpu_to_je32(infosize);
712         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
713         isum.padded = cpu_to_je32(c->summary->sum_padded);
714         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
715         isum.sum_num = cpu_to_je32(c->summary->sum_num);
716         wpage = c->summary->sum_buf;
717 
718         while (c->summary->sum_num) {
719                 temp = c->summary->sum_list_head;
720 
721                 switch (je16_to_cpu(temp->u.nodetype)) {
722                         case JFFS2_NODETYPE_INODE: {
723                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
724 
725                                 sino_ptr->nodetype = temp->i.nodetype;
726                                 sino_ptr->inode = temp->i.inode;
727                                 sino_ptr->version = temp->i.version;
728                                 sino_ptr->offset = temp->i.offset;
729                                 sino_ptr->totlen = temp->i.totlen;
730 
731                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
732 
733                                 break;
734                         }
735 
736                         case JFFS2_NODETYPE_DIRENT: {
737                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
738 
739                                 sdrnt_ptr->nodetype = temp->d.nodetype;
740                                 sdrnt_ptr->totlen = temp->d.totlen;
741                                 sdrnt_ptr->offset = temp->d.offset;
742                                 sdrnt_ptr->pino = temp->d.pino;
743                                 sdrnt_ptr->version = temp->d.version;
744                                 sdrnt_ptr->ino = temp->d.ino;
745                                 sdrnt_ptr->nsize = temp->d.nsize;
746                                 sdrnt_ptr->type = temp->d.type;
747 
748                                 memcpy(sdrnt_ptr->name, temp->d.name,
749                                                         temp->d.nsize);
750 
751                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
752 
753                                 break;
754                         }
755 #ifdef CONFIG_JFFS2_FS_XATTR
756                         case JFFS2_NODETYPE_XATTR: {
757                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
758 
759                                 temp = c->summary->sum_list_head;
760                                 sxattr_ptr->nodetype = temp->x.nodetype;
761                                 sxattr_ptr->xid = temp->x.xid;
762                                 sxattr_ptr->version = temp->x.version;
763                                 sxattr_ptr->offset = temp->x.offset;
764                                 sxattr_ptr->totlen = temp->x.totlen;
765 
766                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
767                                 break;
768                         }
769                         case JFFS2_NODETYPE_XREF: {
770                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
771 
772                                 temp = c->summary->sum_list_head;
773                                 sxref_ptr->nodetype = temp->r.nodetype;
774                                 sxref_ptr->offset = temp->r.offset;
775 
776                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
777                                 break;
778                         }
779 #endif
780                         default : {
781                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
782                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
783                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
784                                                     je16_to_cpu(temp->u.nodetype));
785                                         jffs2_sum_disable_collecting(c->summary);
786                                 } else {
787                                         BUG();  /* unknown node in summary information */
788                                 }
789                         }
790                 }
791 
792                 c->summary->sum_list_head = temp->u.next;
793                 kfree(temp);
794 
795                 c->summary->sum_num--;
796         }
797 
798         jffs2_sum_reset_collected(c->summary);
799 
800         wpage += padsize;
801 
802         sm = wpage;
803         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
804         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
805 
806         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
807         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
808 
809         vecs[0].iov_base = &isum;
810         vecs[0].iov_len = sizeof(isum);
811         vecs[1].iov_base = c->summary->sum_buf;
812         vecs[1].iov_len = datasize;
813 
814         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
815 
816         dbg_summary("writing out data to flash to pos : 0x%08x\n", sum_ofs);
817 
818         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
819 
820         if (ret || (retlen != infosize)) {
821 
822                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
823                               infosize, sum_ofs, ret, retlen);
824 
825                 if (retlen) {
826                         /* Waste remaining space */
827                         spin_lock(&c->erase_completion_lock);
828                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
829                         spin_unlock(&c->erase_completion_lock);
830                 }
831 
832                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
833 
834                 return 0;
835         }
836 
837         spin_lock(&c->erase_completion_lock);
838         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
839         spin_unlock(&c->erase_completion_lock);
840 
841         return 0;
842 }
843 
844 /* Write out summary information - called from jffs2_do_reserve_space */
845 
846 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
847         __must_hold(&c->erase_completion_block)
848 {
849         int datasize, infosize, padsize;
850         struct jffs2_eraseblock *jeb;
851         int ret = 0;
852 
853         dbg_summary("called\n");
854 
855         spin_unlock(&c->erase_completion_lock);
856 
857         jeb = c->nextblock;
858         jffs2_prealloc_raw_node_refs(c, jeb, 1);
859 
860         if (!c->summary->sum_num || !c->summary->sum_list_head) {
861                 JFFS2_WARNING("Empty summary info!!!\n");
862                 BUG();
863         }
864 
865         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
866         infosize = sizeof(struct jffs2_raw_summary) + datasize;
867         padsize = jeb->free_size - infosize;
868         infosize += padsize;
869         datasize += padsize;
870 
871         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
872         spin_lock(&c->erase_completion_lock);
873         return ret;
874 }
875 

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