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0001 /*
0002  * JFFS2 -- Journalling Flash File System, Version 2.
0003  *
0004  * Copyright © 2004  Ferenc Havasi <havasi@inf.u-szeged.hu>,
0005  *           Zoltan Sogor <weth@inf.u-szeged.hu>,
0006  *           Patrik Kluba <pajko@halom.u-szeged.hu>,
0007  *           University of Szeged, Hungary
0008  *         2006  KaiGai Kohei <kaigai@ak.jp.nec.com>
0009  *
0010  * For licensing information, see the file 'LICENCE' in this directory.
0011  *
0012  */
0013 
0014 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0015 
0016 #include <linux/kernel.h>
0017 #include <linux/slab.h>
0018 #include <linux/mtd/mtd.h>
0019 #include <linux/pagemap.h>
0020 #include <linux/crc32.h>
0021 #include <linux/compiler.h>
0022 #include <linux/vmalloc.h>
0023 #include "nodelist.h"
0024 #include "debug.h"
0025 
0026 int jffs2_sum_init(struct jffs2_sb_info *c)
0027 {
0028     uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
0029 
0030     c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
0031 
0032     if (!c->summary) {
0033         JFFS2_WARNING("Can't allocate memory for summary information!\n");
0034         return -ENOMEM;
0035     }
0036 
0037     c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL);
0038 
0039     if (!c->summary->sum_buf) {
0040         JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
0041         kfree(c->summary);
0042         return -ENOMEM;
0043     }
0044 
0045     dbg_summary("returned successfully\n");
0046 
0047     return 0;
0048 }
0049 
0050 void jffs2_sum_exit(struct jffs2_sb_info *c)
0051 {
0052     dbg_summary("called\n");
0053 
0054     jffs2_sum_disable_collecting(c->summary);
0055 
0056     kfree(c->summary->sum_buf);
0057     c->summary->sum_buf = NULL;
0058 
0059     kfree(c->summary);
0060     c->summary = NULL;
0061 }
0062 
0063 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
0064 {
0065     if (!s->sum_list_head)
0066         s->sum_list_head = (union jffs2_sum_mem *) item;
0067     if (s->sum_list_tail)
0068         s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
0069     s->sum_list_tail = (union jffs2_sum_mem *) item;
0070 
0071     switch (je16_to_cpu(item->u.nodetype)) {
0072         case JFFS2_NODETYPE_INODE:
0073             s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
0074             s->sum_num++;
0075             dbg_summary("inode (%u) added to summary\n",
0076                         je32_to_cpu(item->i.inode));
0077             break;
0078         case JFFS2_NODETYPE_DIRENT:
0079             s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
0080             s->sum_num++;
0081             dbg_summary("dirent (%u) added to summary\n",
0082                         je32_to_cpu(item->d.ino));
0083             break;
0084 #ifdef CONFIG_JFFS2_FS_XATTR
0085         case JFFS2_NODETYPE_XATTR:
0086             s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
0087             s->sum_num++;
0088             dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
0089                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
0090             break;
0091         case JFFS2_NODETYPE_XREF:
0092             s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
0093             s->sum_num++;
0094             dbg_summary("xref added to summary\n");
0095             break;
0096 #endif
0097         default:
0098             JFFS2_WARNING("UNKNOWN node type %u\n",
0099                         je16_to_cpu(item->u.nodetype));
0100             return 1;
0101     }
0102     return 0;
0103 }
0104 
0105 
0106 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
0107 
0108 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
0109 {
0110     dbg_summary("called with %u\n", size);
0111     s->sum_padded += size;
0112     return 0;
0113 }
0114 
0115 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
0116                 uint32_t ofs)
0117 {
0118     struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
0119 
0120     if (!temp)
0121         return -ENOMEM;
0122 
0123     temp->nodetype = ri->nodetype;
0124     temp->inode = ri->ino;
0125     temp->version = ri->version;
0126     temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */
0127     temp->totlen = ri->totlen;
0128     temp->next = NULL;
0129 
0130     return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
0131 }
0132 
0133 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
0134                 uint32_t ofs)
0135 {
0136     struct jffs2_sum_dirent_mem *temp =
0137         kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
0138 
0139     if (!temp)
0140         return -ENOMEM;
0141 
0142     temp->nodetype = rd->nodetype;
0143     temp->totlen = rd->totlen;
0144     temp->offset = cpu_to_je32(ofs);    /* relative from the beginning of the jeb */
0145     temp->pino = rd->pino;
0146     temp->version = rd->version;
0147     temp->ino = rd->ino;
0148     temp->nsize = rd->nsize;
0149     temp->type = rd->type;
0150     temp->next = NULL;
0151 
0152     memcpy(temp->name, rd->name, rd->nsize);
0153 
0154     return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
0155 }
0156 
0157 #ifdef CONFIG_JFFS2_FS_XATTR
0158 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
0159 {
0160     struct jffs2_sum_xattr_mem *temp;
0161 
0162     temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
0163     if (!temp)
0164         return -ENOMEM;
0165 
0166     temp->nodetype = rx->nodetype;
0167     temp->xid = rx->xid;
0168     temp->version = rx->version;
0169     temp->offset = cpu_to_je32(ofs);
0170     temp->totlen = rx->totlen;
0171     temp->next = NULL;
0172 
0173     return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
0174 }
0175 
0176 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
0177 {
0178     struct jffs2_sum_xref_mem *temp;
0179 
0180     temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
0181     if (!temp)
0182         return -ENOMEM;
0183 
0184     temp->nodetype = rr->nodetype;
0185     temp->offset = cpu_to_je32(ofs);
0186     temp->next = NULL;
0187 
0188     return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
0189 }
0190 #endif
0191 /* Cleanup every collected summary information */
0192 
0193 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
0194 {
0195     union jffs2_sum_mem *temp;
0196 
0197     if (!s->sum_list_head) {
0198         dbg_summary("already empty\n");
0199     }
0200     while (s->sum_list_head) {
0201         temp = s->sum_list_head;
0202         s->sum_list_head = s->sum_list_head->u.next;
0203         kfree(temp);
0204     }
0205     s->sum_list_tail = NULL;
0206     s->sum_padded = 0;
0207     s->sum_num = 0;
0208 }
0209 
0210 void jffs2_sum_reset_collected(struct jffs2_summary *s)
0211 {
0212     dbg_summary("called\n");
0213     jffs2_sum_clean_collected(s);
0214     s->sum_size = 0;
0215 }
0216 
0217 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
0218 {
0219     dbg_summary("called\n");
0220     jffs2_sum_clean_collected(s);
0221     s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
0222 }
0223 
0224 int jffs2_sum_is_disabled(struct jffs2_summary *s)
0225 {
0226     return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
0227 }
0228 
0229 /* Move the collected summary information into sb (called from scan.c) */
0230 
0231 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
0232 {
0233     dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
0234                 c->summary->sum_size, c->summary->sum_num,
0235                 s->sum_size, s->sum_num);
0236 
0237     c->summary->sum_size = s->sum_size;
0238     c->summary->sum_num = s->sum_num;
0239     c->summary->sum_padded = s->sum_padded;
0240     c->summary->sum_list_head = s->sum_list_head;
0241     c->summary->sum_list_tail = s->sum_list_tail;
0242 
0243     s->sum_list_head = s->sum_list_tail = NULL;
0244 }
0245 
0246 /* Called from wbuf.c to collect writed node info */
0247 
0248 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
0249                 unsigned long count, uint32_t ofs)
0250 {
0251     union jffs2_node_union *node;
0252     struct jffs2_eraseblock *jeb;
0253 
0254     if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
0255         dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
0256         return 0;
0257     }
0258 
0259     node = invecs[0].iov_base;
0260     jeb = &c->blocks[ofs / c->sector_size];
0261     ofs -= jeb->offset;
0262 
0263     switch (je16_to_cpu(node->u.nodetype)) {
0264         case JFFS2_NODETYPE_INODE: {
0265             struct jffs2_sum_inode_mem *temp =
0266                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
0267 
0268             if (!temp)
0269                 goto no_mem;
0270 
0271             temp->nodetype = node->i.nodetype;
0272             temp->inode = node->i.ino;
0273             temp->version = node->i.version;
0274             temp->offset = cpu_to_je32(ofs);
0275             temp->totlen = node->i.totlen;
0276             temp->next = NULL;
0277 
0278             return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
0279         }
0280 
0281         case JFFS2_NODETYPE_DIRENT: {
0282             struct jffs2_sum_dirent_mem *temp =
0283                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
0284 
0285             if (!temp)
0286                 goto no_mem;
0287 
0288             temp->nodetype = node->d.nodetype;
0289             temp->totlen = node->d.totlen;
0290             temp->offset = cpu_to_je32(ofs);
0291             temp->pino = node->d.pino;
0292             temp->version = node->d.version;
0293             temp->ino = node->d.ino;
0294             temp->nsize = node->d.nsize;
0295             temp->type = node->d.type;
0296             temp->next = NULL;
0297 
0298             switch (count) {
0299                 case 1:
0300                     memcpy(temp->name,node->d.name,node->d.nsize);
0301                     break;
0302 
0303                 case 2:
0304                     memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
0305                     break;
0306 
0307                 default:
0308                     BUG();  /* impossible count value */
0309                     break;
0310             }
0311 
0312             return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
0313         }
0314 #ifdef CONFIG_JFFS2_FS_XATTR
0315         case JFFS2_NODETYPE_XATTR: {
0316             struct jffs2_sum_xattr_mem *temp;
0317             temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
0318             if (!temp)
0319                 goto no_mem;
0320 
0321             temp->nodetype = node->x.nodetype;
0322             temp->xid = node->x.xid;
0323             temp->version = node->x.version;
0324             temp->totlen = node->x.totlen;
0325             temp->offset = cpu_to_je32(ofs);
0326             temp->next = NULL;
0327 
0328             return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
0329         }
0330         case JFFS2_NODETYPE_XREF: {
0331             struct jffs2_sum_xref_mem *temp;
0332             temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
0333             if (!temp)
0334                 goto no_mem;
0335             temp->nodetype = node->r.nodetype;
0336             temp->offset = cpu_to_je32(ofs);
0337             temp->next = NULL;
0338 
0339             return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
0340         }
0341 #endif
0342         case JFFS2_NODETYPE_PADDING:
0343             dbg_summary("node PADDING\n");
0344             c->summary->sum_padded += je32_to_cpu(node->u.totlen);
0345             break;
0346 
0347         case JFFS2_NODETYPE_CLEANMARKER:
0348             dbg_summary("node CLEANMARKER\n");
0349             break;
0350 
0351         case JFFS2_NODETYPE_SUMMARY:
0352             dbg_summary("node SUMMARY\n");
0353             break;
0354 
0355         default:
0356             /* If you implement a new node type you should also implement
0357                summary support for it or disable summary.
0358             */
0359             BUG();
0360             break;
0361     }
0362 
0363     return 0;
0364 
0365 no_mem:
0366     JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
0367     return -ENOMEM;
0368 }
0369 
0370 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
0371                             struct jffs2_eraseblock *jeb,
0372                             uint32_t ofs, uint32_t len,
0373                             struct jffs2_inode_cache *ic)
0374 {
0375     /* If there was a gap, mark it dirty */
0376     if ((ofs & ~3) > c->sector_size - jeb->free_size) {
0377         /* Ew. Summary doesn't actually tell us explicitly about dirty space */
0378         jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
0379     }
0380 
0381     return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
0382 }
0383 
0384 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
0385 
0386 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
0387                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
0388 {
0389     struct jffs2_inode_cache *ic;
0390     struct jffs2_full_dirent *fd;
0391     void *sp;
0392     int i, ino;
0393     int err;
0394 
0395     sp = summary->sum;
0396 
0397     for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
0398         dbg_summary("processing summary index %d\n", i);
0399 
0400         cond_resched();
0401 
0402         /* Make sure there's a spare ref for dirty space */
0403         err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
0404         if (err)
0405             return err;
0406 
0407         switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
0408             case JFFS2_NODETYPE_INODE: {
0409                 struct jffs2_sum_inode_flash *spi;
0410                 spi = sp;
0411 
0412                 ino = je32_to_cpu(spi->inode);
0413 
0414                 dbg_summary("Inode at 0x%08x-0x%08x\n",
0415                         jeb->offset + je32_to_cpu(spi->offset),
0416                         jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
0417 
0418                 ic = jffs2_scan_make_ino_cache(c, ino);
0419                 if (!ic) {
0420                     JFFS2_NOTICE("scan_make_ino_cache failed\n");
0421                     return -ENOMEM;
0422                 }
0423 
0424                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
0425                           PAD(je32_to_cpu(spi->totlen)), ic);
0426 
0427                 *pseudo_random += je32_to_cpu(spi->version);
0428 
0429                 sp += JFFS2_SUMMARY_INODE_SIZE;
0430 
0431                 break;
0432             }
0433 
0434             case JFFS2_NODETYPE_DIRENT: {
0435                 struct jffs2_sum_dirent_flash *spd;
0436                 int checkedlen;
0437                 spd = sp;
0438 
0439                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
0440                         jeb->offset + je32_to_cpu(spd->offset),
0441                         jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
0442 
0443 
0444                 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
0445                 checkedlen = strnlen(spd->name, spd->nsize);
0446                 if (!checkedlen) {
0447                     pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n",
0448                            jeb->offset +
0449                            je32_to_cpu(spd->offset));
0450                     return -EIO;
0451                 }
0452                 if (checkedlen < spd->nsize) {
0453                     pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n",
0454                            jeb->offset +
0455                            je32_to_cpu(spd->offset),
0456                            checkedlen);
0457                 }
0458 
0459 
0460                 fd = jffs2_alloc_full_dirent(checkedlen+1);
0461                 if (!fd)
0462                     return -ENOMEM;
0463 
0464                 memcpy(&fd->name, spd->name, checkedlen);
0465                 fd->name[checkedlen] = 0;
0466 
0467                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
0468                 if (!ic) {
0469                     jffs2_free_full_dirent(fd);
0470                     return -ENOMEM;
0471                 }
0472 
0473                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
0474                                 PAD(je32_to_cpu(spd->totlen)), ic);
0475 
0476                 fd->next = NULL;
0477                 fd->version = je32_to_cpu(spd->version);
0478                 fd->ino = je32_to_cpu(spd->ino);
0479                 fd->nhash = full_name_hash(NULL, fd->name, checkedlen);
0480                 fd->type = spd->type;
0481 
0482                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
0483 
0484                 *pseudo_random += je32_to_cpu(spd->version);
0485 
0486                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
0487 
0488                 break;
0489             }
0490 #ifdef CONFIG_JFFS2_FS_XATTR
0491             case JFFS2_NODETYPE_XATTR: {
0492                 struct jffs2_xattr_datum *xd;
0493                 struct jffs2_sum_xattr_flash *spx;
0494 
0495                 spx = (struct jffs2_sum_xattr_flash *)sp;
0496                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 
0497                         jeb->offset + je32_to_cpu(spx->offset),
0498                         jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
0499                         je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
0500 
0501                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
0502                                 je32_to_cpu(spx->version));
0503                 if (IS_ERR(xd))
0504                     return PTR_ERR(xd);
0505                 if (xd->version > je32_to_cpu(spx->version)) {
0506                     /* node is not the newest one */
0507                     struct jffs2_raw_node_ref *raw
0508                         = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
0509                                     PAD(je32_to_cpu(spx->totlen)), NULL);
0510                     raw->next_in_ino = xd->node->next_in_ino;
0511                     xd->node->next_in_ino = raw;
0512                 } else {
0513                     xd->version = je32_to_cpu(spx->version);
0514                     sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
0515                               PAD(je32_to_cpu(spx->totlen)), (void *)xd);
0516                 }
0517                 *pseudo_random += je32_to_cpu(spx->xid);
0518                 sp += JFFS2_SUMMARY_XATTR_SIZE;
0519 
0520                 break;
0521             }
0522             case JFFS2_NODETYPE_XREF: {
0523                 struct jffs2_xattr_ref *ref;
0524                 struct jffs2_sum_xref_flash *spr;
0525 
0526                 spr = (struct jffs2_sum_xref_flash *)sp;
0527                 dbg_summary("xref at %#08x-%#08x\n",
0528                         jeb->offset + je32_to_cpu(spr->offset),
0529                         jeb->offset + je32_to_cpu(spr->offset) + 
0530                         (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
0531 
0532                 ref = jffs2_alloc_xattr_ref();
0533                 if (!ref) {
0534                     JFFS2_NOTICE("allocation of xattr_datum failed\n");
0535                     return -ENOMEM;
0536                 }
0537                 ref->next = c->xref_temp;
0538                 c->xref_temp = ref;
0539 
0540                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
0541                           PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
0542 
0543                 *pseudo_random += ref->node->flash_offset;
0544                 sp += JFFS2_SUMMARY_XREF_SIZE;
0545 
0546                 break;
0547             }
0548 #endif
0549             default : {
0550                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
0551                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
0552                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
0553                     return -EIO;
0554 
0555                 /* For compatible node types, just fall back to the full scan */
0556                 c->wasted_size -= jeb->wasted_size;
0557                 c->free_size += c->sector_size - jeb->free_size;
0558                 c->used_size -= jeb->used_size;
0559                 c->dirty_size -= jeb->dirty_size;
0560                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
0561                 jeb->free_size = c->sector_size;
0562 
0563                 jffs2_free_jeb_node_refs(c, jeb);
0564                 return -ENOTRECOVERABLE;
0565             }
0566         }
0567     }
0568     return 0;
0569 }
0570 
0571 /* Process the summary node - called from jffs2_scan_eraseblock() */
0572 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
0573                struct jffs2_raw_summary *summary, uint32_t sumsize,
0574                uint32_t *pseudo_random)
0575 {
0576     struct jffs2_unknown_node crcnode;
0577     int ret, ofs;
0578     uint32_t crc;
0579 
0580     ofs = c->sector_size - sumsize;
0581 
0582     dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
0583             jeb->offset, jeb->offset + ofs, sumsize);
0584 
0585     /* OK, now check for node validity and CRC */
0586     crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
0587     crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
0588     crcnode.totlen = summary->totlen;
0589     crc = crc32(0, &crcnode, sizeof(crcnode)-4);
0590 
0591     if (je32_to_cpu(summary->hdr_crc) != crc) {
0592         dbg_summary("Summary node header is corrupt (bad CRC or "
0593                 "no summary at all)\n");
0594         goto crc_err;
0595     }
0596 
0597     if (je32_to_cpu(summary->totlen) != sumsize) {
0598         dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
0599         goto crc_err;
0600     }
0601 
0602     crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
0603 
0604     if (je32_to_cpu(summary->node_crc) != crc) {
0605         dbg_summary("Summary node is corrupt (bad CRC)\n");
0606         goto crc_err;
0607     }
0608 
0609     crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
0610 
0611     if (je32_to_cpu(summary->sum_crc) != crc) {
0612         dbg_summary("Summary node data is corrupt (bad CRC)\n");
0613         goto crc_err;
0614     }
0615 
0616     if ( je32_to_cpu(summary->cln_mkr) ) {
0617 
0618         dbg_summary("Summary : CLEANMARKER node \n");
0619 
0620         ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
0621         if (ret)
0622             return ret;
0623 
0624         if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
0625             dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
0626                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
0627             if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
0628                 return ret;
0629         } else if (jeb->first_node) {
0630             dbg_summary("CLEANMARKER node not first node in block "
0631                     "(0x%08x)\n", jeb->offset);
0632             if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
0633                 return ret;
0634         } else {
0635             jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
0636                         je32_to_cpu(summary->cln_mkr), NULL);
0637         }
0638     }
0639 
0640     ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
0641     /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
0642        scan of this eraseblock. So return zero */
0643     if (ret == -ENOTRECOVERABLE)
0644         return 0;
0645     if (ret)
0646         return ret;     /* real error */
0647 
0648     /* for PARANOIA_CHECK */
0649     ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
0650     if (ret)
0651         return ret;
0652 
0653     sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
0654 
0655     if (unlikely(jeb->free_size)) {
0656         JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
0657                   jeb->free_size, jeb->offset);
0658         jeb->wasted_size += jeb->free_size;
0659         c->wasted_size += jeb->free_size;
0660         c->free_size -= jeb->free_size;
0661         jeb->free_size = 0;
0662     }
0663 
0664     return jffs2_scan_classify_jeb(c, jeb);
0665 
0666 crc_err:
0667     JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
0668 
0669     return 0;
0670 }
0671 
0672 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
0673 
0674 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
0675                 uint32_t infosize, uint32_t datasize, int padsize)
0676 {
0677     struct jffs2_raw_summary isum;
0678     union jffs2_sum_mem *temp;
0679     struct jffs2_sum_marker *sm;
0680     struct kvec vecs[2];
0681     uint32_t sum_ofs;
0682     void *wpage;
0683     int ret;
0684     size_t retlen;
0685 
0686     if (padsize + datasize > MAX_SUMMARY_SIZE) {
0687         /* It won't fit in the buffer. Abort summary for this jeb */
0688         jffs2_sum_disable_collecting(c->summary);
0689 
0690         JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
0691                   datasize, padsize, jeb->offset);
0692         /* Non-fatal */
0693         return 0;
0694     }
0695     /* Is there enough space for summary? */
0696     if (padsize < 0) {
0697         /* don't try to write out summary for this jeb */
0698         jffs2_sum_disable_collecting(c->summary);
0699 
0700         JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
0701                   padsize);
0702         /* Non-fatal */
0703         return 0;
0704     }
0705 
0706     memset(c->summary->sum_buf, 0xff, datasize);
0707     memset(&isum, 0, sizeof(isum));
0708 
0709     isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
0710     isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
0711     isum.totlen = cpu_to_je32(infosize);
0712     isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
0713     isum.padded = cpu_to_je32(c->summary->sum_padded);
0714     isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
0715     isum.sum_num = cpu_to_je32(c->summary->sum_num);
0716     wpage = c->summary->sum_buf;
0717 
0718     while (c->summary->sum_num) {
0719         temp = c->summary->sum_list_head;
0720 
0721         switch (je16_to_cpu(temp->u.nodetype)) {
0722             case JFFS2_NODETYPE_INODE: {
0723                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
0724 
0725                 sino_ptr->nodetype = temp->i.nodetype;
0726                 sino_ptr->inode = temp->i.inode;
0727                 sino_ptr->version = temp->i.version;
0728                 sino_ptr->offset = temp->i.offset;
0729                 sino_ptr->totlen = temp->i.totlen;
0730 
0731                 wpage += JFFS2_SUMMARY_INODE_SIZE;
0732 
0733                 break;
0734             }
0735 
0736             case JFFS2_NODETYPE_DIRENT: {
0737                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
0738 
0739                 sdrnt_ptr->nodetype = temp->d.nodetype;
0740                 sdrnt_ptr->totlen = temp->d.totlen;
0741                 sdrnt_ptr->offset = temp->d.offset;
0742                 sdrnt_ptr->pino = temp->d.pino;
0743                 sdrnt_ptr->version = temp->d.version;
0744                 sdrnt_ptr->ino = temp->d.ino;
0745                 sdrnt_ptr->nsize = temp->d.nsize;
0746                 sdrnt_ptr->type = temp->d.type;
0747 
0748                 memcpy(sdrnt_ptr->name, temp->d.name,
0749                             temp->d.nsize);
0750 
0751                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
0752 
0753                 break;
0754             }
0755 #ifdef CONFIG_JFFS2_FS_XATTR
0756             case JFFS2_NODETYPE_XATTR: {
0757                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
0758 
0759                 temp = c->summary->sum_list_head;
0760                 sxattr_ptr->nodetype = temp->x.nodetype;
0761                 sxattr_ptr->xid = temp->x.xid;
0762                 sxattr_ptr->version = temp->x.version;
0763                 sxattr_ptr->offset = temp->x.offset;
0764                 sxattr_ptr->totlen = temp->x.totlen;
0765 
0766                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
0767                 break;
0768             }
0769             case JFFS2_NODETYPE_XREF: {
0770                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
0771 
0772                 temp = c->summary->sum_list_head;
0773                 sxref_ptr->nodetype = temp->r.nodetype;
0774                 sxref_ptr->offset = temp->r.offset;
0775 
0776                 wpage += JFFS2_SUMMARY_XREF_SIZE;
0777                 break;
0778             }
0779 #endif
0780             default : {
0781                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
0782                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
0783                     dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
0784                             je16_to_cpu(temp->u.nodetype));
0785                     jffs2_sum_disable_collecting(c->summary);
0786                     /* The above call removes the list, nothing more to do */
0787                     goto bail_rwcompat;
0788                 } else {
0789                     BUG();  /* unknown node in summary information */
0790                 }
0791             }
0792         }
0793 
0794         c->summary->sum_list_head = temp->u.next;
0795         kfree(temp);
0796 
0797         c->summary->sum_num--;
0798     }
0799  bail_rwcompat:
0800 
0801     jffs2_sum_reset_collected(c->summary);
0802 
0803     wpage += padsize;
0804 
0805     sm = wpage;
0806     sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
0807     sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
0808 
0809     isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
0810     isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
0811 
0812     vecs[0].iov_base = &isum;
0813     vecs[0].iov_len = sizeof(isum);
0814     vecs[1].iov_base = c->summary->sum_buf;
0815     vecs[1].iov_len = datasize;
0816 
0817     sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
0818 
0819     dbg_summary("writing out data to flash to pos : 0x%08x\n", sum_ofs);
0820 
0821     ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
0822 
0823     if (ret || (retlen != infosize)) {
0824 
0825         JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
0826                   infosize, sum_ofs, ret, retlen);
0827 
0828         if (retlen) {
0829             /* Waste remaining space */
0830             spin_lock(&c->erase_completion_lock);
0831             jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
0832             spin_unlock(&c->erase_completion_lock);
0833         }
0834 
0835         c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
0836 
0837         return 0;
0838     }
0839 
0840     spin_lock(&c->erase_completion_lock);
0841     jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
0842     spin_unlock(&c->erase_completion_lock);
0843 
0844     return 0;
0845 }
0846 
0847 /* Write out summary information - called from jffs2_do_reserve_space */
0848 
0849 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
0850     __must_hold(&c->erase_completion_block)
0851 {
0852     int datasize, infosize, padsize;
0853     struct jffs2_eraseblock *jeb;
0854     int ret = 0;
0855 
0856     dbg_summary("called\n");
0857 
0858     spin_unlock(&c->erase_completion_lock);
0859 
0860     jeb = c->nextblock;
0861     jffs2_prealloc_raw_node_refs(c, jeb, 1);
0862 
0863     if (!c->summary->sum_num || !c->summary->sum_list_head) {
0864         JFFS2_WARNING("Empty summary info!!!\n");
0865         BUG();
0866     }
0867 
0868     datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
0869     infosize = sizeof(struct jffs2_raw_summary) + datasize;
0870     padsize = jeb->free_size - infosize;
0871     infosize += padsize;
0872     datasize += padsize;
0873 
0874     ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
0875     spin_lock(&c->erase_completion_lock);
0876     return ret;
0877 }
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