Root/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
24int 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 = vmalloc(sum_size);
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
48void jffs2_sum_exit(struct jffs2_sb_info *c)
49{
50    dbg_summary("called\n");
51
52    jffs2_sum_disable_collecting(c->summary);
53
54    vfree(c->summary->sum_buf);
55    c->summary->sum_buf = NULL;
56
57    kfree(c->summary);
58    c->summary = NULL;
59}
60
61static 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
106int 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
113int 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
131int 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
156int 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
174int 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
191static 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
208void 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
215void 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
222int 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
229void 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
246int 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
363no_mem:
364    JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
365    return -ENOMEM;
366}
367
368static 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
384static 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() */
567int 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
661crc_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
669static 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
842int 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}
870

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