Fix the epca driver to permit epca_setup() to be invoked from the kernel cmdline
[linux-2.6] / 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         c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
27
28         if (!c->summary) {
29                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
30                 return -ENOMEM;
31         }
32
33         c->summary->sum_buf = vmalloc(c->sector_size);
34
35         if (!c->summary->sum_buf) {
36                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
37                 kfree(c->summary);
38                 return -ENOMEM;
39         }
40
41         dbg_summary("returned successfully\n");
42
43         return 0;
44 }
45
46 void jffs2_sum_exit(struct jffs2_sb_info *c)
47 {
48         dbg_summary("called\n");
49
50         jffs2_sum_disable_collecting(c->summary);
51
52         vfree(c->summary->sum_buf);
53         c->summary->sum_buf = NULL;
54
55         kfree(c->summary);
56         c->summary = NULL;
57 }
58
59 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
60 {
61         if (!s->sum_list_head)
62                 s->sum_list_head = (union jffs2_sum_mem *) item;
63         if (s->sum_list_tail)
64                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
65         s->sum_list_tail = (union jffs2_sum_mem *) item;
66
67         switch (je16_to_cpu(item->u.nodetype)) {
68                 case JFFS2_NODETYPE_INODE:
69                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
70                         s->sum_num++;
71                         dbg_summary("inode (%u) added to summary\n",
72                                                 je32_to_cpu(item->i.inode));
73                         break;
74                 case JFFS2_NODETYPE_DIRENT:
75                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
76                         s->sum_num++;
77                         dbg_summary("dirent (%u) added to summary\n",
78                                                 je32_to_cpu(item->d.ino));
79                         break;
80 #ifdef CONFIG_JFFS2_FS_XATTR
81                 case JFFS2_NODETYPE_XATTR:
82                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
83                         s->sum_num++;
84                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
85                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
86                         break;
87                 case JFFS2_NODETYPE_XREF:
88                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
89                         s->sum_num++;
90                         dbg_summary("xref added to summary\n");
91                         break;
92 #endif
93                 default:
94                         JFFS2_WARNING("UNKNOWN node type %u\n",
95                                             je16_to_cpu(item->u.nodetype));
96                         return 1;
97         }
98         return 0;
99 }
100
101
102 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
103
104 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
105 {
106         dbg_summary("called with %u\n", size);
107         s->sum_padded += size;
108         return 0;
109 }
110
111 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
112                                 uint32_t ofs)
113 {
114         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
115
116         if (!temp)
117                 return -ENOMEM;
118
119         temp->nodetype = ri->nodetype;
120         temp->inode = ri->ino;
121         temp->version = ri->version;
122         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
123         temp->totlen = ri->totlen;
124         temp->next = NULL;
125
126         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
127 }
128
129 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
130                                 uint32_t ofs)
131 {
132         struct jffs2_sum_dirent_mem *temp =
133                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
134
135         if (!temp)
136                 return -ENOMEM;
137
138         temp->nodetype = rd->nodetype;
139         temp->totlen = rd->totlen;
140         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
141         temp->pino = rd->pino;
142         temp->version = rd->version;
143         temp->ino = rd->ino;
144         temp->nsize = rd->nsize;
145         temp->type = rd->type;
146         temp->next = NULL;
147
148         memcpy(temp->name, rd->name, rd->nsize);
149
150         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
151 }
152
153 #ifdef CONFIG_JFFS2_FS_XATTR
154 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
155 {
156         struct jffs2_sum_xattr_mem *temp;
157
158         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
159         if (!temp)
160                 return -ENOMEM;
161
162         temp->nodetype = rx->nodetype;
163         temp->xid = rx->xid;
164         temp->version = rx->version;
165         temp->offset = cpu_to_je32(ofs);
166         temp->totlen = rx->totlen;
167         temp->next = NULL;
168
169         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
170 }
171
172 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
173 {
174         struct jffs2_sum_xref_mem *temp;
175
176         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
177         if (!temp)
178                 return -ENOMEM;
179
180         temp->nodetype = rr->nodetype;
181         temp->offset = cpu_to_je32(ofs);
182         temp->next = NULL;
183
184         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
185 }
186 #endif
187 /* Cleanup every collected summary information */
188
189 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
190 {
191         union jffs2_sum_mem *temp;
192
193         if (!s->sum_list_head) {
194                 dbg_summary("already empty\n");
195         }
196         while (s->sum_list_head) {
197                 temp = s->sum_list_head;
198                 s->sum_list_head = s->sum_list_head->u.next;
199                 kfree(temp);
200         }
201         s->sum_list_tail = NULL;
202         s->sum_padded = 0;
203         s->sum_num = 0;
204 }
205
206 void jffs2_sum_reset_collected(struct jffs2_summary *s)
207 {
208         dbg_summary("called\n");
209         jffs2_sum_clean_collected(s);
210         s->sum_size = 0;
211 }
212
213 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
214 {
215         dbg_summary("called\n");
216         jffs2_sum_clean_collected(s);
217         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
218 }
219
220 int jffs2_sum_is_disabled(struct jffs2_summary *s)
221 {
222         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
223 }
224
225 /* Move the collected summary information into sb (called from scan.c) */
226
227 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
228 {
229         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
230                                 c->summary->sum_size, c->summary->sum_num,
231                                 s->sum_size, s->sum_num);
232
233         c->summary->sum_size = s->sum_size;
234         c->summary->sum_num = s->sum_num;
235         c->summary->sum_padded = s->sum_padded;
236         c->summary->sum_list_head = s->sum_list_head;
237         c->summary->sum_list_tail = s->sum_list_tail;
238
239         s->sum_list_head = s->sum_list_tail = NULL;
240 }
241
242 /* Called from wbuf.c to collect writed node info */
243
244 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
245                                 unsigned long count, uint32_t ofs)
246 {
247         union jffs2_node_union *node;
248         struct jffs2_eraseblock *jeb;
249
250         if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
251                 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
252                 return 0;
253         }
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                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
314                         if (!temp)
315                                 goto no_mem;
316
317                         temp->nodetype = node->x.nodetype;
318                         temp->xid = node->x.xid;
319                         temp->version = node->x.version;
320                         temp->totlen = node->x.totlen;
321                         temp->offset = cpu_to_je32(ofs);
322                         temp->next = NULL;
323
324                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
325                 }
326                 case JFFS2_NODETYPE_XREF: {
327                         struct jffs2_sum_xref_mem *temp;
328                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
329                         if (!temp)
330                                 goto no_mem;
331                         temp->nodetype = node->r.nodetype;
332                         temp->offset = cpu_to_je32(ofs);
333                         temp->next = NULL;
334
335                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
336                 }
337 #endif
338                 case JFFS2_NODETYPE_PADDING:
339                         dbg_summary("node PADDING\n");
340                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
341                         break;
342
343                 case JFFS2_NODETYPE_CLEANMARKER:
344                         dbg_summary("node CLEANMARKER\n");
345                         break;
346
347                 case JFFS2_NODETYPE_SUMMARY:
348                         dbg_summary("node SUMMARY\n");
349                         break;
350
351                 default:
352                         /* If you implement a new node type you should also implement
353                            summary support for it or disable summary.
354                         */
355                         BUG();
356                         break;
357         }
358
359         return 0;
360
361 no_mem:
362         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
363         return -ENOMEM;
364 }
365
366 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
367                                                     struct jffs2_eraseblock *jeb,
368                                                     uint32_t ofs, uint32_t len,
369                                                     struct jffs2_inode_cache *ic)
370 {
371         /* If there was a gap, mark it dirty */
372         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
373                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
374                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
375         }
376
377         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
378 }
379
380 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
381
382 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
383                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
384 {
385         struct jffs2_inode_cache *ic;
386         struct jffs2_full_dirent *fd;
387         void *sp;
388         int i, ino;
389         int err;
390
391         sp = summary->sum;
392
393         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
394                 dbg_summary("processing summary index %d\n", i);
395
396                 cond_resched();
397
398                 /* Make sure there's a spare ref for dirty space */
399                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
400                 if (err)
401                         return err;
402
403                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
404                         case JFFS2_NODETYPE_INODE: {
405                                 struct jffs2_sum_inode_flash *spi;
406                                 spi = sp;
407
408                                 ino = je32_to_cpu(spi->inode);
409
410                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
411                                             jeb->offset + je32_to_cpu(spi->offset),
412                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
413
414                                 ic = jffs2_scan_make_ino_cache(c, ino);
415                                 if (!ic) {
416                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
417                                         return -ENOMEM;
418                                 }
419
420                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
421                                                   PAD(je32_to_cpu(spi->totlen)), ic);
422
423                                 *pseudo_random += je32_to_cpu(spi->version);
424
425                                 sp += JFFS2_SUMMARY_INODE_SIZE;
426
427                                 break;
428                         }
429
430                         case JFFS2_NODETYPE_DIRENT: {
431                                 struct jffs2_sum_dirent_flash *spd;
432                                 int checkedlen;
433                                 spd = sp;
434
435                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
436                                             jeb->offset + je32_to_cpu(spd->offset),
437                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
438
439
440                                 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
441                                 checkedlen = strnlen(spd->name, spd->nsize);
442                                 if (!checkedlen) {
443                                         printk(KERN_ERR "Dirent at %08x has zero at start of name. Aborting mount.\n",
444                                                jeb->offset + je32_to_cpu(spd->offset));
445                                         return -EIO;
446                                 }
447                                 if (checkedlen < spd->nsize) {
448                                         printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n",
449                                                jeb->offset + je32_to_cpu(spd->offset), checkedlen);
450                                 }
451
452
453                                 fd = jffs2_alloc_full_dirent(checkedlen+1);
454                                 if (!fd)
455                                         return -ENOMEM;
456
457                                 memcpy(&fd->name, spd->name, checkedlen);
458                                 fd->name[checkedlen] = 0;
459
460                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
461                                 if (!ic) {
462                                         jffs2_free_full_dirent(fd);
463                                         return -ENOMEM;
464                                 }
465
466                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
467                                                             PAD(je32_to_cpu(spd->totlen)), ic);
468
469                                 fd->next = NULL;
470                                 fd->version = je32_to_cpu(spd->version);
471                                 fd->ino = je32_to_cpu(spd->ino);
472                                 fd->nhash = full_name_hash(fd->name, checkedlen);
473                                 fd->type = spd->type;
474
475                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
476
477                                 *pseudo_random += je32_to_cpu(spd->version);
478
479                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
480
481                                 break;
482                         }
483 #ifdef CONFIG_JFFS2_FS_XATTR
484                         case JFFS2_NODETYPE_XATTR: {
485                                 struct jffs2_xattr_datum *xd;
486                                 struct jffs2_sum_xattr_flash *spx;
487
488                                 spx = (struct jffs2_sum_xattr_flash *)sp;
489                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 
490                                             jeb->offset + je32_to_cpu(spx->offset),
491                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
492                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
493
494                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
495                                                                 je32_to_cpu(spx->version));
496                                 if (IS_ERR(xd))
497                                         return PTR_ERR(xd);
498                                 if (xd->version > je32_to_cpu(spx->version)) {
499                                         /* node is not the newest one */
500                                         struct jffs2_raw_node_ref *raw
501                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
502                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
503                                         raw->next_in_ino = xd->node->next_in_ino;
504                                         xd->node->next_in_ino = raw;
505                                 } else {
506                                         xd->version = je32_to_cpu(spx->version);
507                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
508                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
509                                 }
510                                 *pseudo_random += je32_to_cpu(spx->xid);
511                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
512
513                                 break;
514                         }
515                         case JFFS2_NODETYPE_XREF: {
516                                 struct jffs2_xattr_ref *ref;
517                                 struct jffs2_sum_xref_flash *spr;
518
519                                 spr = (struct jffs2_sum_xref_flash *)sp;
520                                 dbg_summary("xref at %#08x-%#08x\n",
521                                             jeb->offset + je32_to_cpu(spr->offset),
522                                             jeb->offset + je32_to_cpu(spr->offset) + 
523                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
524
525                                 ref = jffs2_alloc_xattr_ref();
526                                 if (!ref) {
527                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
528                                         return -ENOMEM;
529                                 }
530                                 ref->next = c->xref_temp;
531                                 c->xref_temp = ref;
532
533                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
534                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
535
536                                 *pseudo_random += ref->node->flash_offset;
537                                 sp += JFFS2_SUMMARY_XREF_SIZE;
538
539                                 break;
540                         }
541 #endif
542                         default : {
543                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
544                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
545                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
546                                         return -EIO;
547
548                                 /* For compatible node types, just fall back to the full scan */
549                                 c->wasted_size -= jeb->wasted_size;
550                                 c->free_size += c->sector_size - jeb->free_size;
551                                 c->used_size -= jeb->used_size;
552                                 c->dirty_size -= jeb->dirty_size;
553                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
554                                 jeb->free_size = c->sector_size;
555
556                                 jffs2_free_jeb_node_refs(c, jeb);
557                                 return -ENOTRECOVERABLE;
558                         }
559                 }
560         }
561         return 0;
562 }
563
564 /* Process the summary node - called from jffs2_scan_eraseblock() */
565 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
566                            struct jffs2_raw_summary *summary, uint32_t sumsize,
567                            uint32_t *pseudo_random)
568 {
569         struct jffs2_unknown_node crcnode;
570         int ret, ofs;
571         uint32_t crc;
572
573         ofs = c->sector_size - sumsize;
574
575         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
576                     jeb->offset, jeb->offset + ofs, sumsize);
577
578         /* OK, now check for node validity and CRC */
579         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
580         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
581         crcnode.totlen = summary->totlen;
582         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
583
584         if (je32_to_cpu(summary->hdr_crc) != crc) {
585                 dbg_summary("Summary node header is corrupt (bad CRC or "
586                                 "no summary at all)\n");
587                 goto crc_err;
588         }
589
590         if (je32_to_cpu(summary->totlen) != sumsize) {
591                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
592                 goto crc_err;
593         }
594
595         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
596
597         if (je32_to_cpu(summary->node_crc) != crc) {
598                 dbg_summary("Summary node is corrupt (bad CRC)\n");
599                 goto crc_err;
600         }
601
602         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
603
604         if (je32_to_cpu(summary->sum_crc) != crc) {
605                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
606                 goto crc_err;
607         }
608
609         if ( je32_to_cpu(summary->cln_mkr) ) {
610
611                 dbg_summary("Summary : CLEANMARKER node \n");
612
613                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
614                 if (ret)
615                         return ret;
616
617                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
618                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
619                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
620                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
621                                 return ret;
622                 } else if (jeb->first_node) {
623                         dbg_summary("CLEANMARKER node not first node in block "
624                                         "(0x%08x)\n", jeb->offset);
625                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
626                                 return ret;
627                 } else {
628                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
629                                             je32_to_cpu(summary->cln_mkr), NULL);
630                 }
631         }
632
633         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
634         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
635            scan of this eraseblock. So return zero */
636         if (ret == -ENOTRECOVERABLE)
637                 return 0;
638         if (ret)
639                 return ret;             /* real error */
640
641         /* for PARANOIA_CHECK */
642         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
643         if (ret)
644                 return ret;
645
646         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
647
648         if (unlikely(jeb->free_size)) {
649                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
650                               jeb->free_size, jeb->offset);
651                 jeb->wasted_size += jeb->free_size;
652                 c->wasted_size += jeb->free_size;
653                 c->free_size -= jeb->free_size;
654                 jeb->free_size = 0;
655         }
656
657         return jffs2_scan_classify_jeb(c, jeb);
658
659 crc_err:
660         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
661
662         return 0;
663 }
664
665 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
666
667 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
668                                         uint32_t infosize, uint32_t datasize, int padsize)
669 {
670         struct jffs2_raw_summary isum;
671         union jffs2_sum_mem *temp;
672         struct jffs2_sum_marker *sm;
673         struct kvec vecs[2];
674         uint32_t sum_ofs;
675         void *wpage;
676         int ret;
677         size_t retlen;
678
679         memset(c->summary->sum_buf, 0xff, datasize);
680         memset(&isum, 0, sizeof(isum));
681
682         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
683         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
684         isum.totlen = cpu_to_je32(infosize);
685         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
686         isum.padded = cpu_to_je32(c->summary->sum_padded);
687         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
688         isum.sum_num = cpu_to_je32(c->summary->sum_num);
689         wpage = c->summary->sum_buf;
690
691         while (c->summary->sum_num) {
692                 temp = c->summary->sum_list_head;
693
694                 switch (je16_to_cpu(temp->u.nodetype)) {
695                         case JFFS2_NODETYPE_INODE: {
696                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
697
698                                 sino_ptr->nodetype = temp->i.nodetype;
699                                 sino_ptr->inode = temp->i.inode;
700                                 sino_ptr->version = temp->i.version;
701                                 sino_ptr->offset = temp->i.offset;
702                                 sino_ptr->totlen = temp->i.totlen;
703
704                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
705
706                                 break;
707                         }
708
709                         case JFFS2_NODETYPE_DIRENT: {
710                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
711
712                                 sdrnt_ptr->nodetype = temp->d.nodetype;
713                                 sdrnt_ptr->totlen = temp->d.totlen;
714                                 sdrnt_ptr->offset = temp->d.offset;
715                                 sdrnt_ptr->pino = temp->d.pino;
716                                 sdrnt_ptr->version = temp->d.version;
717                                 sdrnt_ptr->ino = temp->d.ino;
718                                 sdrnt_ptr->nsize = temp->d.nsize;
719                                 sdrnt_ptr->type = temp->d.type;
720
721                                 memcpy(sdrnt_ptr->name, temp->d.name,
722                                                         temp->d.nsize);
723
724                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
725
726                                 break;
727                         }
728 #ifdef CONFIG_JFFS2_FS_XATTR
729                         case JFFS2_NODETYPE_XATTR: {
730                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
731
732                                 temp = c->summary->sum_list_head;
733                                 sxattr_ptr->nodetype = temp->x.nodetype;
734                                 sxattr_ptr->xid = temp->x.xid;
735                                 sxattr_ptr->version = temp->x.version;
736                                 sxattr_ptr->offset = temp->x.offset;
737                                 sxattr_ptr->totlen = temp->x.totlen;
738
739                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
740                                 break;
741                         }
742                         case JFFS2_NODETYPE_XREF: {
743                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
744
745                                 temp = c->summary->sum_list_head;
746                                 sxref_ptr->nodetype = temp->r.nodetype;
747                                 sxref_ptr->offset = temp->r.offset;
748
749                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
750                                 break;
751                         }
752 #endif
753                         default : {
754                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
755                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
756                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
757                                                     je16_to_cpu(temp->u.nodetype));
758                                         jffs2_sum_disable_collecting(c->summary);
759                                 } else {
760                                         BUG();  /* unknown node in summary information */
761                                 }
762                         }
763                 }
764
765                 c->summary->sum_list_head = temp->u.next;
766                 kfree(temp);
767
768                 c->summary->sum_num--;
769         }
770
771         jffs2_sum_reset_collected(c->summary);
772
773         wpage += padsize;
774
775         sm = wpage;
776         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
777         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
778
779         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
780         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
781
782         vecs[0].iov_base = &isum;
783         vecs[0].iov_len = sizeof(isum);
784         vecs[1].iov_base = c->summary->sum_buf;
785         vecs[1].iov_len = datasize;
786
787         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
788
789         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
790                     sum_ofs);
791
792         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
793
794         if (ret || (retlen != infosize)) {
795
796                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
797                               infosize, sum_ofs, ret, retlen);
798
799                 if (retlen) {
800                         /* Waste remaining space */
801                         spin_lock(&c->erase_completion_lock);
802                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
803                         spin_unlock(&c->erase_completion_lock);
804                 }
805
806                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
807
808                 return 0;
809         }
810
811         spin_lock(&c->erase_completion_lock);
812         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
813         spin_unlock(&c->erase_completion_lock);
814
815         return 0;
816 }
817
818 /* Write out summary information - called from jffs2_do_reserve_space */
819
820 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
821 {
822         int datasize, infosize, padsize;
823         struct jffs2_eraseblock *jeb;
824         int ret;
825
826         dbg_summary("called\n");
827
828         spin_unlock(&c->erase_completion_lock);
829
830         jeb = c->nextblock;
831         jffs2_prealloc_raw_node_refs(c, jeb, 1);
832
833         if (!c->summary->sum_num || !c->summary->sum_list_head) {
834                 JFFS2_WARNING("Empty summary info!!!\n");
835                 BUG();
836         }
837
838         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
839         infosize = sizeof(struct jffs2_raw_summary) + datasize;
840         padsize = jeb->free_size - infosize;
841         infosize += padsize;
842         datasize += padsize;
843
844         /* Is there enough space for summary? */
845         if (padsize < 0) {
846                 /* don't try to write out summary for this jeb */
847                 jffs2_sum_disable_collecting(c->summary);
848
849                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
850                 spin_lock(&c->erase_completion_lock);
851                 return 0;
852         }
853
854         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
855         spin_lock(&c->erase_completion_lock);
856         return ret;
857 }