Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / 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 successfully\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 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
373                                                     struct jffs2_eraseblock *jeb,
374                                                     uint32_t ofs, uint32_t len,
375                                                     struct jffs2_inode_cache *ic)
376 {
377         /* If there was a gap, mark it dirty */
378         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
379                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
380                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
381         }
382
383         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
384 }
385
386 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
387
388 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
389                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
390 {
391         struct jffs2_inode_cache *ic;
392         struct jffs2_full_dirent *fd;
393         void *sp;
394         int i, ino;
395         int err;
396
397         sp = summary->sum;
398
399         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
400                 dbg_summary("processing summary index %d\n", i);
401
402                 /* Make sure there's a spare ref for dirty space */
403                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
404                 if (err)
405                         return err;
406
407                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
408                         case JFFS2_NODETYPE_INODE: {
409                                 struct jffs2_sum_inode_flash *spi;
410                                 spi = sp;
411
412                                 ino = je32_to_cpu(spi->inode);
413
414                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
415                                             jeb->offset + je32_to_cpu(spi->offset),
416                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
417
418                                 ic = jffs2_scan_make_ino_cache(c, ino);
419                                 if (!ic) {
420                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
421                                         return -ENOMEM;
422                                 }
423
424                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
425                                                   PAD(je32_to_cpu(spi->totlen)), ic);
426
427                                 *pseudo_random += je32_to_cpu(spi->version);
428
429                                 sp += JFFS2_SUMMARY_INODE_SIZE;
430
431                                 break;
432                         }
433
434                         case JFFS2_NODETYPE_DIRENT: {
435                                 struct jffs2_sum_dirent_flash *spd;
436                                 spd = sp;
437
438                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
439                                             jeb->offset + je32_to_cpu(spd->offset),
440                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
441
442
443                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
444                                 if (!fd)
445                                         return -ENOMEM;
446
447                                 memcpy(&fd->name, spd->name, spd->nsize);
448                                 fd->name[spd->nsize] = 0;
449
450                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
451                                 if (!ic) {
452                                         jffs2_free_full_dirent(fd);
453                                         return -ENOMEM;
454                                 }
455
456                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
457                                                             PAD(je32_to_cpu(spd->totlen)), ic);
458
459                                 fd->next = NULL;
460                                 fd->version = je32_to_cpu(spd->version);
461                                 fd->ino = je32_to_cpu(spd->ino);
462                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
463                                 fd->type = spd->type;
464
465                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
466
467                                 *pseudo_random += je32_to_cpu(spd->version);
468
469                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
470
471                                 break;
472                         }
473 #ifdef CONFIG_JFFS2_FS_XATTR
474                         case JFFS2_NODETYPE_XATTR: {
475                                 struct jffs2_xattr_datum *xd;
476                                 struct jffs2_sum_xattr_flash *spx;
477
478                                 spx = (struct jffs2_sum_xattr_flash *)sp;
479                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 
480                                             jeb->offset + je32_to_cpu(spx->offset),
481                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
482                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
483
484                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
485                                                                 je32_to_cpu(spx->version));
486                                 if (IS_ERR(xd)) {
487                                         if (PTR_ERR(xd) == -EEXIST) {
488                                                 /* a newer version of xd exists */
489                                                 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(spx->totlen))))
490                                                         return err;
491                                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
492                                                 break;
493                                         }
494                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
495                                         return PTR_ERR(xd);
496                                 }
497
498                                 xd->node = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
499                                                              PAD(je32_to_cpu(spx->totlen)), NULL);
500                                 /* FIXME */ xd->node->next_in_ino = (void *)xd;
501
502                                 *pseudo_random += je32_to_cpu(spx->xid);
503                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
504
505                                 break;
506                         }
507                         case JFFS2_NODETYPE_XREF: {
508                                 struct jffs2_xattr_ref *ref;
509                                 struct jffs2_sum_xref_flash *spr;
510
511                                 spr = (struct jffs2_sum_xref_flash *)sp;
512                                 dbg_summary("xref at %#08x-%#08x\n",
513                                             jeb->offset + je32_to_cpu(spr->offset),
514                                             jeb->offset + je32_to_cpu(spr->offset) + 
515                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
516
517                                 ref = jffs2_alloc_xattr_ref();
518                                 if (!ref) {
519                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
520                                         return -ENOMEM;
521                                 }
522                                 ref->ino = 0xfffffffe;
523                                 ref->xid = 0xfffffffd;
524                                 ref->next = c->xref_temp;
525                                 c->xref_temp = ref;
526
527                                 ref->node = sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
528                                                               PAD(sizeof(struct jffs2_raw_xref)), NULL);
529                                 /* FIXME */ ref->node->next_in_ino = (void *)ref;
530
531                                 *pseudo_random += ref->node->flash_offset;
532                                 sp += JFFS2_SUMMARY_XREF_SIZE;
533
534                                 break;
535                         }
536 #endif
537                         default : {
538                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
539                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
540                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
541                                         return -EIO;
542
543                                 /* For compatible node types, just fall back to the full scan */
544                                 c->wasted_size -= jeb->wasted_size;
545                                 c->free_size += c->sector_size - jeb->free_size;
546                                 c->used_size -= jeb->used_size;
547                                 c->dirty_size -= jeb->dirty_size;
548                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
549                                 jeb->free_size = c->sector_size;
550
551                                 jffs2_free_jeb_node_refs(c, jeb);
552                                 return -ENOTRECOVERABLE;
553                         }
554                 }
555         }
556         return 0;
557 }
558
559 /* Process the summary node - called from jffs2_scan_eraseblock() */
560 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
561                            struct jffs2_raw_summary *summary, uint32_t sumsize,
562                            uint32_t *pseudo_random)
563 {
564         struct jffs2_unknown_node crcnode;
565         int ret, ofs;
566         uint32_t crc;
567
568         ofs = c->sector_size - sumsize;
569
570         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
571                     jeb->offset, jeb->offset + ofs, sumsize);
572
573         /* OK, now check for node validity and CRC */
574         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
575         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
576         crcnode.totlen = summary->totlen;
577         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
578
579         if (je32_to_cpu(summary->hdr_crc) != crc) {
580                 dbg_summary("Summary node header is corrupt (bad CRC or "
581                                 "no summary at all)\n");
582                 goto crc_err;
583         }
584
585         if (je32_to_cpu(summary->totlen) != sumsize) {
586                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
587                 goto crc_err;
588         }
589
590         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
591
592         if (je32_to_cpu(summary->node_crc) != crc) {
593                 dbg_summary("Summary node is corrupt (bad CRC)\n");
594                 goto crc_err;
595         }
596
597         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
598
599         if (je32_to_cpu(summary->sum_crc) != crc) {
600                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
601                 goto crc_err;
602         }
603
604         if ( je32_to_cpu(summary->cln_mkr) ) {
605
606                 dbg_summary("Summary : CLEANMARKER node \n");
607
608                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
609                 if (ret)
610                         return ret;
611
612                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
613                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
614                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
615                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
616                                 return ret;
617                 } else if (jeb->first_node) {
618                         dbg_summary("CLEANMARKER node not first node in block "
619                                         "(0x%08x)\n", jeb->offset);
620                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
621                                 return ret;
622                 } else {
623                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
624                                             je32_to_cpu(summary->cln_mkr), NULL);
625                 }
626         }
627
628         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
629         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
630            scan of this eraseblock. So return zero */
631         if (ret == -ENOTRECOVERABLE)
632                 return 0;
633         if (ret)
634                 return ret;             /* real error */
635
636         /* for PARANOIA_CHECK */
637         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
638         if (ret)
639                 return ret;
640
641         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
642
643         if (unlikely(jeb->free_size)) {
644                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
645                               jeb->free_size, jeb->offset);
646                 jeb->wasted_size += jeb->free_size;
647                 c->wasted_size += jeb->free_size;
648                 c->free_size -= jeb->free_size;
649                 jeb->free_size = 0;
650         }
651
652         return jffs2_scan_classify_jeb(c, jeb);
653
654 crc_err:
655         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
656
657         return 0;
658 }
659
660 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
661
662 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
663                                         uint32_t infosize, uint32_t datasize, int padsize)
664 {
665         struct jffs2_raw_summary isum;
666         union jffs2_sum_mem *temp;
667         struct jffs2_sum_marker *sm;
668         struct kvec vecs[2];
669         uint32_t sum_ofs;
670         void *wpage;
671         int ret;
672         size_t retlen;
673
674         memset(c->summary->sum_buf, 0xff, datasize);
675         memset(&isum, 0, sizeof(isum));
676
677         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
678         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
679         isum.totlen = cpu_to_je32(infosize);
680         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
681         isum.padded = cpu_to_je32(c->summary->sum_padded);
682         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
683         isum.sum_num = cpu_to_je32(c->summary->sum_num);
684         wpage = c->summary->sum_buf;
685
686         while (c->summary->sum_num) {
687                 temp = c->summary->sum_list_head;
688
689                 switch (je16_to_cpu(temp->u.nodetype)) {
690                         case JFFS2_NODETYPE_INODE: {
691                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
692
693                                 sino_ptr->nodetype = temp->i.nodetype;
694                                 sino_ptr->inode = temp->i.inode;
695                                 sino_ptr->version = temp->i.version;
696                                 sino_ptr->offset = temp->i.offset;
697                                 sino_ptr->totlen = temp->i.totlen;
698
699                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
700
701                                 break;
702                         }
703
704                         case JFFS2_NODETYPE_DIRENT: {
705                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
706
707                                 sdrnt_ptr->nodetype = temp->d.nodetype;
708                                 sdrnt_ptr->totlen = temp->d.totlen;
709                                 sdrnt_ptr->offset = temp->d.offset;
710                                 sdrnt_ptr->pino = temp->d.pino;
711                                 sdrnt_ptr->version = temp->d.version;
712                                 sdrnt_ptr->ino = temp->d.ino;
713                                 sdrnt_ptr->nsize = temp->d.nsize;
714                                 sdrnt_ptr->type = temp->d.type;
715
716                                 memcpy(sdrnt_ptr->name, temp->d.name,
717                                                         temp->d.nsize);
718
719                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
720
721                                 break;
722                         }
723 #ifdef CONFIG_JFFS2_FS_XATTR
724                         case JFFS2_NODETYPE_XATTR: {
725                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
726
727                                 temp = c->summary->sum_list_head;
728                                 sxattr_ptr->nodetype = temp->x.nodetype;
729                                 sxattr_ptr->xid = temp->x.xid;
730                                 sxattr_ptr->version = temp->x.version;
731                                 sxattr_ptr->offset = temp->x.offset;
732                                 sxattr_ptr->totlen = temp->x.totlen;
733
734                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
735                                 break;
736                         }
737                         case JFFS2_NODETYPE_XREF: {
738                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
739
740                                 temp = c->summary->sum_list_head;
741                                 sxref_ptr->nodetype = temp->r.nodetype;
742                                 sxref_ptr->offset = temp->r.offset;
743
744                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
745                                 break;
746                         }
747 #endif
748                         default : {
749                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
750                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
751                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
752                                                     je16_to_cpu(temp->u.nodetype));
753                                         jffs2_sum_disable_collecting(c->summary);
754                                 } else {
755                                         BUG();  /* unknown node in summary information */
756                                 }
757                         }
758                 }
759
760                 c->summary->sum_list_head = temp->u.next;
761                 kfree(temp);
762
763                 c->summary->sum_num--;
764         }
765
766         jffs2_sum_reset_collected(c->summary);
767
768         wpage += padsize;
769
770         sm = wpage;
771         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
772         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
773
774         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
775         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
776
777         vecs[0].iov_base = &isum;
778         vecs[0].iov_len = sizeof(isum);
779         vecs[1].iov_base = c->summary->sum_buf;
780         vecs[1].iov_len = datasize;
781
782         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
783
784         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
785                     sum_ofs);
786
787         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
788
789         if (ret || (retlen != infosize)) {
790
791                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
792                               infosize, sum_ofs, ret, retlen);
793
794                 if (retlen) {
795                         /* Waste remaining space */
796                         spin_lock(&c->erase_completion_lock);
797                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
798                         spin_unlock(&c->erase_completion_lock);
799                 }
800
801                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
802
803                 return 0;
804         }
805
806         spin_lock(&c->erase_completion_lock);
807         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
808         spin_unlock(&c->erase_completion_lock);
809
810         return 0;
811 }
812
813 /* Write out summary information - called from jffs2_do_reserve_space */
814
815 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
816 {
817         int datasize, infosize, padsize;
818         struct jffs2_eraseblock *jeb;
819         int ret;
820
821         dbg_summary("called\n");
822
823         spin_unlock(&c->erase_completion_lock);
824
825         jeb = c->nextblock;
826         jffs2_prealloc_raw_node_refs(c, jeb, 1);
827
828         if (!c->summary->sum_num || !c->summary->sum_list_head) {
829                 JFFS2_WARNING("Empty summary info!!!\n");
830                 BUG();
831         }
832
833         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
834         infosize = sizeof(struct jffs2_raw_summary) + datasize;
835         padsize = jeb->free_size - infosize;
836         infosize += padsize;
837         datasize += padsize;
838
839         /* Is there enough space for summary? */
840         if (padsize < 0) {
841                 /* don't try to write out summary for this jeb */
842                 jffs2_sum_disable_collecting(c->summary);
843
844                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
845                 spin_lock(&c->erase_completion_lock);
846                 return 0;
847         }
848
849         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
850         spin_lock(&c->erase_completion_lock);
851         return ret;
852 }