New helper - current_umask()
[linux-2.6.git] / fs / jffs2 / summary.c
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 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/pagemap.h>
18 #include <linux/crc32.h>
19 #include <linux/compiler.h>
20 #include <linux/vmalloc.h>
21 #include "nodelist.h"
22 #include "debug.h"
23
24 int jffs2_sum_init(struct jffs2_sb_info *c)
25 {
26         uint32_t sum_size = max_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
27
28         c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
29
30         if (!c->summary) {
31                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
32                 return -ENOMEM;
33         }
34
35         c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL);
36
37         if (!c->summary->sum_buf) {
38                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
39                 kfree(c->summary);
40                 return -ENOMEM;
41         }
42
43         dbg_summary("returned successfully\n");
44
45         return 0;
46 }
47
48 void jffs2_sum_exit(struct jffs2_sb_info *c)
49 {
50         dbg_summary("called\n");
51
52         jffs2_sum_disable_collecting(c->summary);
53
54         kfree(c->summary->sum_buf);
55         c->summary->sum_buf = NULL;
56
57         kfree(c->summary);
58         c->summary = NULL;
59 }
60
61 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
62 {
63         if (!s->sum_list_head)
64                 s->sum_list_head = (union jffs2_sum_mem *) item;
65         if (s->sum_list_tail)
66                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
67         s->sum_list_tail = (union jffs2_sum_mem *) item;
68
69         switch (je16_to_cpu(item->u.nodetype)) {
70                 case JFFS2_NODETYPE_INODE:
71                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
72                         s->sum_num++;
73                         dbg_summary("inode (%u) added to summary\n",
74                                                 je32_to_cpu(item->i.inode));
75                         break;
76                 case JFFS2_NODETYPE_DIRENT:
77                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
78                         s->sum_num++;
79                         dbg_summary("dirent (%u) added to summary\n",
80                                                 je32_to_cpu(item->d.ino));
81                         break;
82 #ifdef CONFIG_JFFS2_FS_XATTR
83                 case JFFS2_NODETYPE_XATTR:
84                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
85                         s->sum_num++;
86                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
87                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
88                         break;
89                 case JFFS2_NODETYPE_XREF:
90                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
91                         s->sum_num++;
92                         dbg_summary("xref added to summary\n");
93                         break;
94 #endif
95                 default:
96                         JFFS2_WARNING("UNKNOWN node type %u\n",
97                                             je16_to_cpu(item->u.nodetype));
98                         return 1;
99         }
100         return 0;
101 }
102
103
104 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
105
106 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
107 {
108         dbg_summary("called with %u\n", size);
109         s->sum_padded += size;
110         return 0;
111 }
112
113 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
114                                 uint32_t ofs)
115 {
116         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
117
118         if (!temp)
119                 return -ENOMEM;
120
121         temp->nodetype = ri->nodetype;
122         temp->inode = ri->ino;
123         temp->version = ri->version;
124         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
125         temp->totlen = ri->totlen;
126         temp->next = NULL;
127
128         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
129 }
130
131 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
132                                 uint32_t ofs)
133 {
134         struct jffs2_sum_dirent_mem *temp =
135                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
136
137         if (!temp)
138                 return -ENOMEM;
139
140         temp->nodetype = rd->nodetype;
141         temp->totlen = rd->totlen;
142         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
143         temp->pino = rd->pino;
144         temp->version = rd->version;
145         temp->ino = rd->ino;
146         temp->nsize = rd->nsize;
147         temp->type = rd->type;
148         temp->next = NULL;
149
150         memcpy(temp->name, rd->name, rd->nsize);
151
152         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
153 }
154
155 #ifdef CONFIG_JFFS2_FS_XATTR
156 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
157 {
158         struct jffs2_sum_xattr_mem *temp;
159
160         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
161         if (!temp)
162                 return -ENOMEM;
163
164         temp->nodetype = rx->nodetype;
165         temp->xid = rx->xid;
166         temp->version = rx->version;
167         temp->offset = cpu_to_je32(ofs);
168         temp->totlen = rx->totlen;
169         temp->next = NULL;
170
171         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
172 }
173
174 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
175 {
176         struct jffs2_sum_xref_mem *temp;
177
178         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
179         if (!temp)
180                 return -ENOMEM;
181
182         temp->nodetype = rr->nodetype;
183         temp->offset = cpu_to_je32(ofs);
184         temp->next = NULL;
185
186         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
187 }
188 #endif
189 /* Cleanup every collected summary information */
190
191 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
192 {
193         union jffs2_sum_mem *temp;
194
195         if (!s->sum_list_head) {
196                 dbg_summary("already empty\n");
197         }
198         while (s->sum_list_head) {
199                 temp = s->sum_list_head;
200                 s->sum_list_head = s->sum_list_head->u.next;
201                 kfree(temp);
202         }
203         s->sum_list_tail = NULL;
204         s->sum_padded = 0;
205         s->sum_num = 0;
206 }
207
208 void jffs2_sum_reset_collected(struct jffs2_summary *s)
209 {
210         dbg_summary("called\n");
211         jffs2_sum_clean_collected(s);
212         s->sum_size = 0;
213 }
214
215 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
216 {
217         dbg_summary("called\n");
218         jffs2_sum_clean_collected(s);
219         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
220 }
221
222 int jffs2_sum_is_disabled(struct jffs2_summary *s)
223 {
224         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
225 }
226
227 /* Move the collected summary information into sb (called from scan.c) */
228
229 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
230 {
231         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
232                                 c->summary->sum_size, c->summary->sum_num,
233                                 s->sum_size, s->sum_num);
234
235         c->summary->sum_size = s->sum_size;
236         c->summary->sum_num = s->sum_num;
237         c->summary->sum_padded = s->sum_padded;
238         c->summary->sum_list_head = s->sum_list_head;
239         c->summary->sum_list_tail = s->sum_list_tail;
240
241         s->sum_list_head = s->sum_list_tail = NULL;
242 }
243
244 /* Called from wbuf.c to collect writed node info */
245
246 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
247                                 unsigned long count, uint32_t ofs)
248 {
249         union jffs2_node_union *node;
250         struct jffs2_eraseblock *jeb;
251
252         if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
253                 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
254                 return 0;
255         }
256
257         node = invecs[0].iov_base;
258         jeb = &c->blocks[ofs / c->sector_size];
259         ofs -= jeb->offset;
260
261         switch (je16_to_cpu(node->u.nodetype)) {
262                 case JFFS2_NODETYPE_INODE: {
263                         struct jffs2_sum_inode_mem *temp =
264                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
265
266                         if (!temp)
267                                 goto no_mem;
268
269                         temp->nodetype = node->i.nodetype;
270                         temp->inode = node->i.ino;
271                         temp->version = node->i.version;
272                         temp->offset = cpu_to_je32(ofs);
273                         temp->totlen = node->i.totlen;
274                         temp->next = NULL;
275
276                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
277                 }
278
279                 case JFFS2_NODETYPE_DIRENT: {
280                         struct jffs2_sum_dirent_mem *temp =
281                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
282
283                         if (!temp)
284                                 goto no_mem;
285
286                         temp->nodetype = node->d.nodetype;
287                         temp->totlen = node->d.totlen;
288                         temp->offset = cpu_to_je32(ofs);
289                         temp->pino = node->d.pino;
290                         temp->version = node->d.version;
291                         temp->ino = node->d.ino;
292                         temp->nsize = node->d.nsize;
293                         temp->type = node->d.type;
294                         temp->next = NULL;
295
296                         switch (count) {
297                                 case 1:
298                                         memcpy(temp->name,node->d.name,node->d.nsize);
299                                         break;
300
301                                 case 2:
302                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
303                                         break;
304
305                                 default:
306                                         BUG();  /* impossible count value */
307                                         break;
308                         }
309
310                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
311                 }
312 #ifdef CONFIG_JFFS2_FS_XATTR
313                 case JFFS2_NODETYPE_XATTR: {
314                         struct jffs2_sum_xattr_mem *temp;
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                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
331                         if (!temp)
332                                 goto no_mem;
333                         temp->nodetype = node->r.nodetype;
334                         temp->offset = cpu_to_je32(ofs);
335                         temp->next = NULL;
336
337                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
338                 }
339 #endif
340                 case JFFS2_NODETYPE_PADDING:
341                         dbg_summary("node PADDING\n");
342                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
343                         break;
344
345                 case JFFS2_NODETYPE_CLEANMARKER:
346                         dbg_summary("node CLEANMARKER\n");
347                         break;
348
349                 case JFFS2_NODETYPE_SUMMARY:
350                         dbg_summary("node SUMMARY\n");
351                         break;
352
353                 default:
354                         /* If you implement a new node type you should also implement
355                            summary support for it or disable summary.
356                         */
357                         BUG();
358                         break;
359         }
360
361         return 0;
362
363 no_mem:
364         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
365         return -ENOMEM;
366 }
367
368 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
369                                                     struct jffs2_eraseblock *jeb,
370                                                     uint32_t ofs, uint32_t len,
371                                                     struct jffs2_inode_cache *ic)
372 {
373         /* If there was a gap, mark it dirty */
374         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
375                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
376                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
377         }
378
379         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
380 }
381
382 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
383
384 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
385                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
386 {
387         struct jffs2_inode_cache *ic;
388         struct jffs2_full_dirent *fd;
389         void *sp;
390         int i, ino;
391         int err;
392
393         sp = summary->sum;
394
395         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
396                 dbg_summary("processing summary index %d\n", i);
397
398                 cond_resched();
399
400                 /* Make sure there's a spare ref for dirty space */
401                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
402                 if (err)
403                         return err;
404
405                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
406                         case JFFS2_NODETYPE_INODE: {
407                                 struct jffs2_sum_inode_flash *spi;
408                                 spi = sp;
409
410                                 ino = je32_to_cpu(spi->inode);
411
412                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
413                                             jeb->offset + je32_to_cpu(spi->offset),
414                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
415
416                                 ic = jffs2_scan_make_ino_cache(c, ino);
417                                 if (!ic) {
418                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
419                                         return -ENOMEM;
420                                 }
421
422                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
423                                                   PAD(je32_to_cpu(spi->totlen)), ic);
424
425                                 *pseudo_random += je32_to_cpu(spi->version);
426
427                                 sp += JFFS2_SUMMARY_INODE_SIZE;
428
429                                 break;
430                         }
431
432                         case JFFS2_NODETYPE_DIRENT: {
433                                 struct jffs2_sum_dirent_flash *spd;
434                                 int checkedlen;
435                                 spd = sp;
436
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));
440
441
442                                 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
443                                 checkedlen = strnlen(spd->name, spd->nsize);
444                                 if (!checkedlen) {
445                                         printk(KERN_ERR "Dirent at %08x has zero at start of name. Aborting mount.\n",
446                                                jeb->offset + je32_to_cpu(spd->offset));
447                                         return -EIO;
448                                 }
449                                 if (checkedlen < spd->nsize) {
450                                         printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n",
451                                                jeb->offset + je32_to_cpu(spd->offset), checkedlen);
452                                 }
453
454
455                                 fd = jffs2_alloc_full_dirent(checkedlen+1);
456                                 if (!fd)
457                                         return -ENOMEM;
458
459                                 memcpy(&fd->name, spd->name, checkedlen);
460                                 fd->name[checkedlen] = 0;
461
462                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
463                                 if (!ic) {
464                                         jffs2_free_full_dirent(fd);
465                                         return -ENOMEM;
466                                 }
467
468                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
469                                                             PAD(je32_to_cpu(spd->totlen)), ic);
470
471                                 fd->next = NULL;
472                                 fd->version = je32_to_cpu(spd->version);
473                                 fd->ino = je32_to_cpu(spd->ino);
474                                 fd->nhash = full_name_hash(fd->name, checkedlen);
475                                 fd->type = spd->type;
476
477                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
478
479                                 *pseudo_random += je32_to_cpu(spd->version);
480
481                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
482
483                                 break;
484                         }
485 #ifdef CONFIG_JFFS2_FS_XATTR
486                         case JFFS2_NODETYPE_XATTR: {
487                                 struct jffs2_xattr_datum *xd;
488                                 struct jffs2_sum_xattr_flash *spx;
489
490                                 spx = (struct jffs2_sum_xattr_flash *)sp;
491                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 
492                                             jeb->offset + je32_to_cpu(spx->offset),
493                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
494                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
495
496                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
497                                                                 je32_to_cpu(spx->version));
498                                 if (IS_ERR(xd))
499                                         return PTR_ERR(xd);
500                                 if (xd->version > je32_to_cpu(spx->version)) {
501                                         /* node is not the newest one */
502                                         struct jffs2_raw_node_ref *raw
503                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
504                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
505                                         raw->next_in_ino = xd->node->next_in_ino;
506                                         xd->node->next_in_ino = raw;
507                                 } else {
508                                         xd->version = je32_to_cpu(spx->version);
509                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
510                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
511                                 }
512                                 *pseudo_random += je32_to_cpu(spx->xid);
513                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
514
515                                 break;
516                         }
517                         case JFFS2_NODETYPE_XREF: {
518                                 struct jffs2_xattr_ref *ref;
519                                 struct jffs2_sum_xref_flash *spr;
520
521                                 spr = (struct jffs2_sum_xref_flash *)sp;
522                                 dbg_summary("xref at %#08x-%#08x\n",
523                                             jeb->offset + je32_to_cpu(spr->offset),
524                                             jeb->offset + je32_to_cpu(spr->offset) + 
525                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
526
527                                 ref = jffs2_alloc_xattr_ref();
528                                 if (!ref) {
529                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
530                                         return -ENOMEM;
531                                 }
532                                 ref->next = c->xref_temp;
533                                 c->xref_temp = ref;
534
535                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
536                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
537
538                                 *pseudo_random += ref->node->flash_offset;
539                                 sp += JFFS2_SUMMARY_XREF_SIZE;
540
541                                 break;
542                         }
543 #endif
544                         default : {
545                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
546                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
547                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
548                                         return -EIO;
549
550                                 /* For compatible node types, just fall back to the full scan */
551                                 c->wasted_size -= jeb->wasted_size;
552                                 c->free_size += c->sector_size - jeb->free_size;
553                                 c->used_size -= jeb->used_size;
554                                 c->dirty_size -= jeb->dirty_size;
555                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
556                                 jeb->free_size = c->sector_size;
557
558                                 jffs2_free_jeb_node_refs(c, jeb);
559                                 return -ENOTRECOVERABLE;
560                         }
561                 }
562         }
563         return 0;
564 }
565
566 /* Process the summary node - called from jffs2_scan_eraseblock() */
567 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
568                            struct jffs2_raw_summary *summary, uint32_t sumsize,
569                            uint32_t *pseudo_random)
570 {
571         struct jffs2_unknown_node crcnode;
572         int ret, ofs;
573         uint32_t crc;
574
575         ofs = c->sector_size - sumsize;
576
577         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
578                     jeb->offset, jeb->offset + ofs, sumsize);
579
580         /* OK, now check for node validity and CRC */
581         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
582         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
583         crcnode.totlen = summary->totlen;
584         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
585
586         if (je32_to_cpu(summary->hdr_crc) != crc) {
587                 dbg_summary("Summary node header is corrupt (bad CRC or "
588                                 "no summary at all)\n");
589                 goto crc_err;
590         }
591
592         if (je32_to_cpu(summary->totlen) != sumsize) {
593                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
594                 goto crc_err;
595         }
596
597         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
598
599         if (je32_to_cpu(summary->node_crc) != crc) {
600                 dbg_summary("Summary node is corrupt (bad CRC)\n");
601                 goto crc_err;
602         }
603
604         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
605
606         if (je32_to_cpu(summary->sum_crc) != crc) {
607                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
608                 goto crc_err;
609         }
610
611         if ( je32_to_cpu(summary->cln_mkr) ) {
612
613                 dbg_summary("Summary : CLEANMARKER node \n");
614
615                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
616                 if (ret)
617                         return ret;
618
619                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
620                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
621                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
622                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
623                                 return ret;
624                 } else if (jeb->first_node) {
625                         dbg_summary("CLEANMARKER node not first node in block "
626                                         "(0x%08x)\n", jeb->offset);
627                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
628                                 return ret;
629                 } else {
630                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
631                                             je32_to_cpu(summary->cln_mkr), NULL);
632                 }
633         }
634
635         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
636         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
637            scan of this eraseblock. So return zero */
638         if (ret == -ENOTRECOVERABLE)
639                 return 0;
640         if (ret)
641                 return ret;             /* real error */
642
643         /* for PARANOIA_CHECK */
644         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
645         if (ret)
646                 return ret;
647
648         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
649
650         if (unlikely(jeb->free_size)) {
651                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
652                               jeb->free_size, jeb->offset);
653                 jeb->wasted_size += jeb->free_size;
654                 c->wasted_size += jeb->free_size;
655                 c->free_size -= jeb->free_size;
656                 jeb->free_size = 0;
657         }
658
659         return jffs2_scan_classify_jeb(c, jeb);
660
661 crc_err:
662         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
663
664         return 0;
665 }
666
667 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
668
669 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
670                                 uint32_t infosize, uint32_t datasize, int padsize)
671 {
672         struct jffs2_raw_summary isum;
673         union jffs2_sum_mem *temp;
674         struct jffs2_sum_marker *sm;
675         struct kvec vecs[2];
676         uint32_t sum_ofs;
677         void *wpage;
678         int ret;
679         size_t retlen;
680
681         if (padsize + datasize > MAX_SUMMARY_SIZE) {
682                 /* It won't fit in the buffer. Abort summary for this jeb */
683                 jffs2_sum_disable_collecting(c->summary);
684
685                 JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
686                               datasize, padsize, jeb->offset);
687                 /* Non-fatal */
688                 return 0;
689         }
690         /* Is there enough space for summary? */
691         if (padsize < 0) {
692                 /* don't try to write out summary for this jeb */
693                 jffs2_sum_disable_collecting(c->summary);
694
695                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
696                               padsize);
697                 /* Non-fatal */
698                 return 0;
699         }
700
701         memset(c->summary->sum_buf, 0xff, datasize);
702         memset(&isum, 0, sizeof(isum));
703
704         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
705         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
706         isum.totlen = cpu_to_je32(infosize);
707         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
708         isum.padded = cpu_to_je32(c->summary->sum_padded);
709         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
710         isum.sum_num = cpu_to_je32(c->summary->sum_num);
711         wpage = c->summary->sum_buf;
712
713         while (c->summary->sum_num) {
714                 temp = c->summary->sum_list_head;
715
716                 switch (je16_to_cpu(temp->u.nodetype)) {
717                         case JFFS2_NODETYPE_INODE: {
718                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
719
720                                 sino_ptr->nodetype = temp->i.nodetype;
721                                 sino_ptr->inode = temp->i.inode;
722                                 sino_ptr->version = temp->i.version;
723                                 sino_ptr->offset = temp->i.offset;
724                                 sino_ptr->totlen = temp->i.totlen;
725
726                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
727
728                                 break;
729                         }
730
731                         case JFFS2_NODETYPE_DIRENT: {
732                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
733
734                                 sdrnt_ptr->nodetype = temp->d.nodetype;
735                                 sdrnt_ptr->totlen = temp->d.totlen;
736                                 sdrnt_ptr->offset = temp->d.offset;
737                                 sdrnt_ptr->pino = temp->d.pino;
738                                 sdrnt_ptr->version = temp->d.version;
739                                 sdrnt_ptr->ino = temp->d.ino;
740                                 sdrnt_ptr->nsize = temp->d.nsize;
741                                 sdrnt_ptr->type = temp->d.type;
742
743                                 memcpy(sdrnt_ptr->name, temp->d.name,
744                                                         temp->d.nsize);
745
746                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
747
748                                 break;
749                         }
750 #ifdef CONFIG_JFFS2_FS_XATTR
751                         case JFFS2_NODETYPE_XATTR: {
752                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
753
754                                 temp = c->summary->sum_list_head;
755                                 sxattr_ptr->nodetype = temp->x.nodetype;
756                                 sxattr_ptr->xid = temp->x.xid;
757                                 sxattr_ptr->version = temp->x.version;
758                                 sxattr_ptr->offset = temp->x.offset;
759                                 sxattr_ptr->totlen = temp->x.totlen;
760
761                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
762                                 break;
763                         }
764                         case JFFS2_NODETYPE_XREF: {
765                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
766
767                                 temp = c->summary->sum_list_head;
768                                 sxref_ptr->nodetype = temp->r.nodetype;
769                                 sxref_ptr->offset = temp->r.offset;
770
771                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
772                                 break;
773                         }
774 #endif
775                         default : {
776                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
777                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
778                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
779                                                     je16_to_cpu(temp->u.nodetype));
780                                         jffs2_sum_disable_collecting(c->summary);
781                                 } else {
782                                         BUG();  /* unknown node in summary information */
783                                 }
784                         }
785                 }
786
787                 c->summary->sum_list_head = temp->u.next;
788                 kfree(temp);
789
790                 c->summary->sum_num--;
791         }
792
793         jffs2_sum_reset_collected(c->summary);
794
795         wpage += padsize;
796
797         sm = wpage;
798         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
799         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
800
801         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
802         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
803
804         vecs[0].iov_base = &isum;
805         vecs[0].iov_len = sizeof(isum);
806         vecs[1].iov_base = c->summary->sum_buf;
807         vecs[1].iov_len = datasize;
808
809         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
810
811         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
812                     sum_ofs);
813
814         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
815
816         if (ret || (retlen != infosize)) {
817
818                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
819                               infosize, sum_ofs, ret, retlen);
820
821                 if (retlen) {
822                         /* Waste remaining space */
823                         spin_lock(&c->erase_completion_lock);
824                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
825                         spin_unlock(&c->erase_completion_lock);
826                 }
827
828                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
829
830                 return 0;
831         }
832
833         spin_lock(&c->erase_completion_lock);
834         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
835         spin_unlock(&c->erase_completion_lock);
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         int datasize, infosize, padsize;
845         struct jffs2_eraseblock *jeb;
846         int ret = 0;
847
848         dbg_summary("called\n");
849
850         spin_unlock(&c->erase_completion_lock);
851
852         jeb = c->nextblock;
853         jffs2_prealloc_raw_node_refs(c, jeb, 1);
854
855         if (!c->summary->sum_num || !c->summary->sum_list_head) {
856                 JFFS2_WARNING("Empty summary info!!!\n");
857                 BUG();
858         }
859
860         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
861         infosize = sizeof(struct jffs2_raw_summary) + datasize;
862         padsize = jeb->free_size - infosize;
863         infosize += padsize;
864         datasize += padsize;
865
866         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
867         spin_lock(&c->erase_completion_lock);
868         return ret;
869 }