[JFFS2] Introduce jffs2_scan_dirty_space() function.
[linux-2.6.git] / fs / jffs2 / summary.c
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  *               2005  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  */
15
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"
26
27 int jffs2_sum_init(struct jffs2_sb_info *c)
28 {
29         c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
30
31         if (!c->summary) {
32                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
33                 return -ENOMEM;
34         }
35
36         memset(c->summary, 0, sizeof(struct jffs2_summary));
37
38         c->summary->sum_buf = vmalloc(c->sector_size);
39
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         }
45
46         dbg_summary("returned succesfully\n");
47
48         return 0;
49 }
50
51 void jffs2_sum_exit(struct jffs2_sb_info *c)
52 {
53         dbg_summary("called\n");
54
55         jffs2_sum_disable_collecting(c->summary);
56
57         vfree(c->summary->sum_buf);
58         c->summary->sum_buf = NULL;
59
60         kfree(c->summary);
61         c->summary = NULL;
62 }
63
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;
71
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 }
105
106
107 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
108
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 }
115
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);
120
121         if (!temp)
122                 return -ENOMEM;
123
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;
130
131         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
132 }
133
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);
139
140         if (!temp)
141                 return -ENOMEM;
142
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;
152
153         memcpy(temp->name, rd->name, rd->nsize);
154
155         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
156 }
157
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;
162
163         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
164         if (!temp)
165                 return -ENOMEM;
166
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;
173
174         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
175 }
176
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;
180
181         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
182         if (!temp)
183                 return -ENOMEM;
184
185         temp->nodetype = rr->nodetype;
186         temp->offset = cpu_to_je32(ofs);
187         temp->next = NULL;
188
189         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
190 }
191 #endif
192 /* Cleanup every collected summary information */
193
194 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
195 {
196         union jffs2_sum_mem *temp;
197
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 }
210
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 }
217
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 }
224
225 int jffs2_sum_is_disabled(struct jffs2_summary *s)
226 {
227         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
228 }
229
230 /* Move the collected summary information into sb (called from scan.c) */
231
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);
237
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;
243
244         s->sum_list_head = s->sum_list_tail = NULL;
245 }
246
247 /* Called from wbuf.c to collect writed node info */
248
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;
254
255         node = invecs[0].iov_base;
256         jeb = &c->blocks[ofs / c->sector_size];
257         ofs -= jeb->offset;
258
259         switch (je16_to_cpu(node->u.nodetype)) {
260                 case JFFS2_NODETYPE_INODE: {
261                         struct jffs2_sum_inode_mem *temp =
262                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
263
264                         if (!temp)
265                                 goto no_mem;
266
267                         temp->nodetype = node->i.nodetype;
268                         temp->inode = node->i.ino;
269                         temp->version = node->i.version;
270                         temp->offset = cpu_to_je32(ofs);
271                         temp->totlen = node->i.totlen;
272                         temp->next = NULL;
273
274                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
275                 }
276
277                 case JFFS2_NODETYPE_DIRENT: {
278                         struct jffs2_sum_dirent_mem *temp =
279                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
280
281                         if (!temp)
282                                 goto no_mem;
283
284                         temp->nodetype = node->d.nodetype;
285                         temp->totlen = node->d.totlen;
286                         temp->offset = cpu_to_je32(ofs);
287                         temp->pino = node->d.pino;
288                         temp->version = node->d.version;
289                         temp->ino = node->d.ino;
290                         temp->nsize = node->d.nsize;
291                         temp->type = node->d.type;
292                         temp->next = NULL;
293
294                         switch (count) {
295                                 case 1:
296                                         memcpy(temp->name,node->d.name,node->d.nsize);
297                                         break;
298
299                                 case 2:
300                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
301                                         break;
302
303                                 default:
304                                         BUG();  /* impossible count value */
305                                         break;
306                         }
307
308                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
309                 }
310 #ifdef CONFIG_JFFS2_FS_XATTR
311                 case JFFS2_NODETYPE_XATTR: {
312                         struct jffs2_sum_xattr_mem *temp;
313                         if (je32_to_cpu(node->x.version) == 0xffffffff)
314                                 return 0;
315                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
316                         if (!temp)
317                                 goto no_mem;
318
319                         temp->nodetype = node->x.nodetype;
320                         temp->xid = node->x.xid;
321                         temp->version = node->x.version;
322                         temp->totlen = node->x.totlen;
323                         temp->offset = cpu_to_je32(ofs);
324                         temp->next = NULL;
325
326                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
327                 }
328                 case JFFS2_NODETYPE_XREF: {
329                         struct jffs2_sum_xref_mem *temp;
330
331                         if (je32_to_cpu(node->r.ino) == 0xffffffff
332                             && je32_to_cpu(node->r.xid) == 0xffffffff)
333                                 return 0;
334                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
335                         if (!temp)
336                                 goto no_mem;
337                         temp->nodetype = node->r.nodetype;
338                         temp->offset = cpu_to_je32(ofs);
339                         temp->next = NULL;
340
341                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
342                 }
343 #endif
344                 case JFFS2_NODETYPE_PADDING:
345                         dbg_summary("node PADDING\n");
346                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
347                         break;
348
349                 case JFFS2_NODETYPE_CLEANMARKER:
350                         dbg_summary("node CLEANMARKER\n");
351                         break;
352
353                 case JFFS2_NODETYPE_SUMMARY:
354                         dbg_summary("node SUMMARY\n");
355                         break;
356
357                 default:
358                         /* If you implement a new node type you should also implement
359                            summary support for it or disable summary.
360                         */
361                         BUG();
362                         break;
363         }
364
365         return 0;
366
367 no_mem:
368         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
369         return -ENOMEM;
370 }
371
372
373 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
374
375 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
376                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
377 {
378         struct jffs2_raw_node_ref *raw;
379         struct jffs2_inode_cache *ic;
380         struct jffs2_full_dirent *fd;
381         void *sp;
382         int i, ino;
383         int err;
384
385         sp = summary->sum;
386
387         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
388                 dbg_summary("processing summary index %d\n", i);
389
390                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
391                         case JFFS2_NODETYPE_INODE: {
392                                 struct jffs2_sum_inode_flash *spi;
393                                 spi = sp;
394
395                                 ino = je32_to_cpu(spi->inode);
396
397                                 dbg_summary("Inode at 0x%08x\n",
398                                                         jeb->offset + je32_to_cpu(spi->offset));
399
400                                 raw = jffs2_alloc_raw_node_ref();
401                                 if (!raw) {
402                                         JFFS2_NOTICE("allocation of node reference failed\n");
403                                         return -ENOMEM;
404                                 }
405
406                                 ic = jffs2_scan_make_ino_cache(c, ino);
407                                 if (!ic) {
408                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
409                                         jffs2_free_raw_node_ref(raw);
410                                         return -ENOMEM;
411                                 }
412
413                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED;
414
415                                 raw->next_in_ino = ic->nodes;
416                                 ic->nodes = raw;
417
418                                 jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(spi->totlen)));
419
420                                 *pseudo_random += je32_to_cpu(spi->version);
421
422                                 sp += JFFS2_SUMMARY_INODE_SIZE;
423
424                                 break;
425                         }
426
427                         case JFFS2_NODETYPE_DIRENT: {
428                                 struct jffs2_sum_dirent_flash *spd;
429                                 spd = sp;
430
431                                 dbg_summary("Dirent at 0x%08x\n",
432                                                         jeb->offset + je32_to_cpu(spd->offset));
433
434                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
435                                 if (!fd)
436                                         return -ENOMEM;
437
438                                 memcpy(&fd->name, spd->name, spd->nsize);
439                                 fd->name[spd->nsize] = 0;
440
441                                 raw = jffs2_alloc_raw_node_ref();
442                                 if (!raw) {
443                                         jffs2_free_full_dirent(fd);
444                                         JFFS2_NOTICE("allocation of node reference failed\n");
445                                         return -ENOMEM;
446                                 }
447
448                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
449                                 if (!ic) {
450                                         jffs2_free_full_dirent(fd);
451                                         jffs2_free_raw_node_ref(raw);
452                                         return -ENOMEM;
453                                 }
454
455                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE;
456                                 raw->next_in_ino = ic->nodes;
457                                 ic->nodes = raw;
458
459                                 jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(spd->totlen)));
460
461                                 fd->raw = raw;
462                                 fd->next = NULL;
463                                 fd->version = je32_to_cpu(spd->version);
464                                 fd->ino = je32_to_cpu(spd->ino);
465                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
466                                 fd->type = spd->type;
467
468                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
469
470                                 *pseudo_random += je32_to_cpu(spd->version);
471
472                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
473
474                                 break;
475                         }
476 #ifdef CONFIG_JFFS2_FS_XATTR
477                         case JFFS2_NODETYPE_XATTR: {
478                                 struct jffs2_xattr_datum *xd;
479                                 struct jffs2_sum_xattr_flash *spx;
480                                 uint32_t ofs;
481
482                                 spx = (struct jffs2_sum_xattr_flash *)sp;
483                                 ofs = jeb->offset + je32_to_cpu(spx->offset);
484                                 dbg_summary("xattr at %#08x (xid=%u, version=%u)\n", ofs,
485                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
486                                 raw = jffs2_alloc_raw_node_ref();
487                                 if (!raw) {
488                                         JFFS2_NOTICE("allocation of node reference failed\n");
489                                         kfree(summary);
490                                         return -ENOMEM;
491                                 }
492                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
493                                                                 je32_to_cpu(spx->version));
494                                 if (IS_ERR(xd)) {
495                                         jffs2_free_raw_node_ref(raw);
496                                         if (PTR_ERR(xd) == -EEXIST) {
497                                                 /* a newer version of xd exists */
498                                                 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(spx->totlen))))
499                                                         return err;
500                                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
501                                                 break;
502                                         }
503                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
504                                         kfree(summary);
505                                         return PTR_ERR(xd);
506                                 }
507                                 xd->node = raw;
508
509                                 raw->flash_offset = ofs | REF_UNCHECKED;
510                                 raw->next_in_ino = (void *)xd;
511
512                                 jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(spx->totlen)));
513
514                                 *pseudo_random += je32_to_cpu(spx->xid);
515                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
516
517                                 break;
518                         }
519                         case JFFS2_NODETYPE_XREF: {
520                                 struct jffs2_xattr_ref *ref;
521                                 struct jffs2_sum_xref_flash *spr;
522                                 uint32_t ofs;
523
524                                 spr = (struct jffs2_sum_xref_flash *)sp;
525                                 ofs = jeb->offset + je32_to_cpu(spr->offset);
526                                 dbg_summary("xref at %#08x (xid=%u, ino=%u)\n", ofs,
527                                             je32_to_cpu(spr->xid), je32_to_cpu(spr->ino));
528                                 raw = jffs2_alloc_raw_node_ref();
529                                 if (!raw) {
530                                         JFFS2_NOTICE("allocation of node reference failed\n");
531                                         kfree(summary);
532                                         return -ENOMEM;
533                                 }
534                                 ref = jffs2_alloc_xattr_ref();
535                                 if (!ref) {
536                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
537                                         jffs2_free_raw_node_ref(raw);
538                                         kfree(summary);
539                                         return -ENOMEM;
540                                 }
541                                 ref->ino = 0xfffffffe;
542                                 ref->xid = 0xfffffffd;
543                                 ref->node = raw;
544                                 ref->next = c->xref_temp;
545                                 c->xref_temp = ref;
546
547                                 raw->flash_offset = ofs | REF_UNCHECKED;
548                                 raw->next_in_ino = (void *)ref;
549
550                                 jffs2_link_node_ref(c, jeb, raw, PAD(sizeof(struct jffs2_raw_xref)));
551
552                                 *pseudo_random += ofs;
553                                 sp += JFFS2_SUMMARY_XREF_SIZE;
554
555                                 break;
556                         }
557 #endif
558                         default : {
559                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
560                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
561                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
562                                         return -EIO;
563
564                                 /* For compatible node types, just fall back to the full scan */
565                                 c->wasted_size -= jeb->wasted_size;
566                                 c->free_size += c->sector_size - jeb->free_size;
567                                 c->used_size -= jeb->used_size;
568                                 c->dirty_size -= jeb->dirty_size;
569                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
570                                 jeb->free_size = c->sector_size;
571
572                                 jffs2_free_all_node_refs(c, jeb);
573                                 return -ENOTRECOVERABLE;
574                         }
575                 }
576         }
577
578         return 0;
579 }
580
581 /* Process the summary node - called from jffs2_scan_eraseblock() */
582 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
583                            struct jffs2_raw_summary *summary, uint32_t sumsize,
584                            uint32_t *pseudo_random)
585 {
586         struct jffs2_unknown_node crcnode;
587         struct jffs2_raw_node_ref *cache_ref;
588         int ret, ofs;
589         uint32_t crc;
590         int err;
591
592         ofs = jeb->offset + c->sector_size - sumsize;
593
594         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
595                     jeb->offset, ofs, sumsize);
596
597         /* OK, now check for node validity and CRC */
598         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
599         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
600         crcnode.totlen = summary->totlen;
601         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
602
603         if (je32_to_cpu(summary->hdr_crc) != crc) {
604                 dbg_summary("Summary node header is corrupt (bad CRC or "
605                                 "no summary at all)\n");
606                 goto crc_err;
607         }
608
609         if (je32_to_cpu(summary->totlen) != sumsize) {
610                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
611                 goto crc_err;
612         }
613
614         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
615
616         if (je32_to_cpu(summary->node_crc) != crc) {
617                 dbg_summary("Summary node is corrupt (bad CRC)\n");
618                 goto crc_err;
619         }
620
621         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
622
623         if (je32_to_cpu(summary->sum_crc) != crc) {
624                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
625                 goto crc_err;
626         }
627
628         if ( je32_to_cpu(summary->cln_mkr) ) {
629
630                 dbg_summary("Summary : CLEANMARKER node \n");
631
632                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
633                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
634                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
635                         if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
636                                 return err;
637                 } else if (jeb->first_node) {
638                         dbg_summary("CLEANMARKER node not first node in block "
639                                         "(0x%08x)\n", jeb->offset);
640                         if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
641                                 return err;
642                 } else {
643                         struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
644
645                         if (!marker_ref) {
646                                 JFFS2_NOTICE("Failed to allocate node ref for clean marker\n");
647                                 return -ENOMEM;
648                         }
649
650                         marker_ref->flash_offset = jeb->offset | REF_NORMAL;
651                         marker_ref->next_in_ino = NULL;
652
653                         jffs2_link_node_ref(c, jeb, marker_ref, je32_to_cpu(summary->cln_mkr));
654                 }
655         }
656
657         if (je32_to_cpu(summary->padded)) {
658                 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(summary->padded))))
659                         return err;
660         }
661
662         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
663         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
664            scan of this eraseblock. So return zero */
665         if (ret == -ENOTRECOVERABLE)
666                 return 0;
667         if (ret)
668                 return ret;             /* real error */
669
670         /* for PARANOIA_CHECK */
671         cache_ref = jffs2_alloc_raw_node_ref();
672
673         if (!cache_ref) {
674                 JFFS2_NOTICE("Failed to allocate node ref for cache\n");
675                 return -ENOMEM;
676         }
677
678         cache_ref->next_in_ino = NULL;
679         cache_ref->next_phys = NULL;
680         cache_ref->flash_offset = ofs | REF_NORMAL;
681
682         jffs2_link_node_ref(c, jeb, cache_ref, sumsize);
683
684         jeb->wasted_size += jeb->free_size;
685         c->wasted_size += jeb->free_size;
686         c->free_size -= jeb->free_size;
687         jeb->free_size = 0;
688
689         return jffs2_scan_classify_jeb(c, jeb);
690
691 crc_err:
692         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
693
694         return 0;
695 }
696
697 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
698
699 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
700                                         uint32_t infosize, uint32_t datasize, int padsize)
701 {
702         struct jffs2_raw_summary isum;
703         union jffs2_sum_mem *temp;
704         struct jffs2_sum_marker *sm;
705         struct kvec vecs[2];
706         void *wpage;
707         int ret;
708         size_t retlen;
709
710         memset(c->summary->sum_buf, 0xff, datasize);
711         memset(&isum, 0, sizeof(isum));
712
713         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
714         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
715         isum.totlen = cpu_to_je32(infosize);
716         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
717         isum.padded = cpu_to_je32(c->summary->sum_padded);
718         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
719         isum.sum_num = cpu_to_je32(c->summary->sum_num);
720         wpage = c->summary->sum_buf;
721
722         while (c->summary->sum_num) {
723                 temp = c->summary->sum_list_head;
724
725                 switch (je16_to_cpu(temp->u.nodetype)) {
726                         case JFFS2_NODETYPE_INODE: {
727                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
728
729                                 sino_ptr->nodetype = temp->i.nodetype;
730                                 sino_ptr->inode = temp->i.inode;
731                                 sino_ptr->version = temp->i.version;
732                                 sino_ptr->offset = temp->i.offset;
733                                 sino_ptr->totlen = temp->i.totlen;
734
735                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
736
737                                 break;
738                         }
739
740                         case JFFS2_NODETYPE_DIRENT: {
741                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
742
743                                 sdrnt_ptr->nodetype = temp->d.nodetype;
744                                 sdrnt_ptr->totlen = temp->d.totlen;
745                                 sdrnt_ptr->offset = temp->d.offset;
746                                 sdrnt_ptr->pino = temp->d.pino;
747                                 sdrnt_ptr->version = temp->d.version;
748                                 sdrnt_ptr->ino = temp->d.ino;
749                                 sdrnt_ptr->nsize = temp->d.nsize;
750                                 sdrnt_ptr->type = temp->d.type;
751
752                                 memcpy(sdrnt_ptr->name, temp->d.name,
753                                                         temp->d.nsize);
754
755                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
756
757                                 break;
758                         }
759 #ifdef CONFIG_JFFS2_FS_XATTR
760                         case JFFS2_NODETYPE_XATTR: {
761                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
762
763                                 temp = c->summary->sum_list_head;
764                                 sxattr_ptr->nodetype = temp->x.nodetype;
765                                 sxattr_ptr->xid = temp->x.xid;
766                                 sxattr_ptr->version = temp->x.version;
767                                 sxattr_ptr->offset = temp->x.offset;
768                                 sxattr_ptr->totlen = temp->x.totlen;
769
770                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
771                                 break;
772                         }
773                         case JFFS2_NODETYPE_XREF: {
774                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
775
776                                 temp = c->summary->sum_list_head;
777                                 sxref_ptr->nodetype = temp->r.nodetype;
778                                 sxref_ptr->offset = temp->r.offset;
779
780                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
781                                 break;
782                         }
783 #endif
784                         default : {
785                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
786                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
787                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
788                                                     je16_to_cpu(temp->u.nodetype));
789                                         jffs2_sum_disable_collecting(c->summary);
790                                 } else {
791                                         BUG();  /* unknown node in summary information */
792                                 }
793                         }
794                 }
795
796                 c->summary->sum_list_head = temp->u.next;
797                 kfree(temp);
798
799                 c->summary->sum_num--;
800         }
801
802         jffs2_sum_reset_collected(c->summary);
803
804         wpage += padsize;
805
806         sm = wpage;
807         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
808         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
809
810         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
811         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
812
813         vecs[0].iov_base = &isum;
814         vecs[0].iov_len = sizeof(isum);
815         vecs[1].iov_base = c->summary->sum_buf;
816         vecs[1].iov_len = datasize;
817
818         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
819                         jeb->offset + c->sector_size - jeb->free_size);
820
821         spin_unlock(&c->erase_completion_lock);
822         ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size -
823                                 jeb->free_size, &retlen, 0);
824         spin_lock(&c->erase_completion_lock);
825
826
827         if (ret || (retlen != infosize)) {
828                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
829                         infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);
830
831                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
832                 jffs2_scan_dirty_space(c, jeb, infosize);
833
834                 return 1;
835         }
836
837         return 0;
838 }
839
840 /* Write out summary information - called from jffs2_do_reserve_space */
841
842 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
843 {
844         struct jffs2_raw_node_ref *summary_ref;
845         int datasize, infosize, padsize, ret;
846         struct jffs2_eraseblock *jeb;
847
848         dbg_summary("called\n");
849
850         jeb = c->nextblock;
851
852         if (!c->summary->sum_num || !c->summary->sum_list_head) {
853                 JFFS2_WARNING("Empty summary info!!!\n");
854                 BUG();
855         }
856
857         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
858         infosize = sizeof(struct jffs2_raw_summary) + datasize;
859         padsize = jeb->free_size - infosize;
860         infosize += padsize;
861         datasize += padsize;
862
863         /* Is there enough space for summary? */
864         if (padsize < 0) {
865                 /* don't try to write out summary for this jeb */
866                 jffs2_sum_disable_collecting(c->summary);
867
868                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
869                 return 0;
870         }
871
872         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
873         if (ret)
874                 return 0; /* can't write out summary, block is marked as NOSUM_SIZE */
875
876         /* for ACCT_PARANOIA_CHECK */
877         spin_unlock(&c->erase_completion_lock);
878         summary_ref = jffs2_alloc_raw_node_ref();
879         spin_lock(&c->erase_completion_lock);
880
881         if (!summary_ref) {
882                 JFFS2_NOTICE("Failed to allocate node ref for summary\n");
883                 return -ENOMEM;
884         }
885
886         summary_ref->next_in_ino = NULL;
887         summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL;
888
889         jffs2_link_node_ref(c, jeb, summary_ref, infosize);
890
891         return 0;
892 }