/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, * Zoltan Sogor <weth@inf.u-szeged.hu>, * Patrik Kluba <pajko@halom.u-szeged.hu>, * University of Szeged, Hungary * * For licensing information, see the file 'LICENCE' in this directory. * * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $ * */ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/mtd/mtd.h> #include <linux/pagemap.h> #include <linux/crc32.h> #include <linux/compiler.h> #include <linux/vmalloc.h> #include "nodelist.h" #include "debug.h" int jffs2_sum_init(struct jffs2_sb_info *c) { c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL); if (!c->summary) { JFFS2_WARNING("Can't allocate memory for summary information!\n"); return -ENOMEM; } memset(c->summary, 0, sizeof(struct jffs2_summary)); c->summary->sum_buf = vmalloc(c->sector_size); if (!c->summary->sum_buf) { JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n"); kfree(c->summary); return -ENOMEM; } dbg_summary("returned succesfully\n"); return 0; } void jffs2_sum_exit(struct jffs2_sb_info *c) { dbg_summary("called\n"); jffs2_sum_disable_collecting(c->summary); vfree(c->summary->sum_buf); c->summary->sum_buf = NULL; kfree(c->summary); c->summary = NULL; } static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item) { if (!s->sum_list_head) s->sum_list_head = (union jffs2_sum_mem *) item; if (s->sum_list_tail) s->sum_list_tail->u.next = (union jffs2_sum_mem *) item; s->sum_list_tail = (union jffs2_sum_mem *) item; switch (je16_to_cpu(item->u.nodetype)) { case JFFS2_NODETYPE_INODE: s->sum_size += JFFS2_SUMMARY_INODE_SIZE; s->sum_num++; dbg_summary("inode (%u) added to summary\n", je32_to_cpu(item->i.inode)); break; case JFFS2_NODETYPE_DIRENT: s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize); s->sum_num++; dbg_summary("dirent (%u) added to summary\n", je32_to_cpu(item->d.ino)); break; default: JFFS2_WARNING("UNKNOWN node type %u\n", je16_to_cpu(item->u.nodetype)); return 1; } return 0; } /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */ int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size) { dbg_summary("called with %u\n", size); s->sum_padded += size; return 0; } int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs) { struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); if (!temp) return -ENOMEM; temp->nodetype = ri->nodetype; temp->inode = ri->ino; temp->version = ri->version; temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */ temp->totlen = ri->totlen; temp->next = NULL; return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); } int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs) { struct jffs2_sum_dirent_mem *temp = kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL); if (!temp) return -ENOMEM; temp->nodetype = rd->nodetype; temp->totlen = rd->totlen; temp->offset = cpu_to_je32(ofs); /* relative from the begining of the jeb */ temp->pino = rd->pino; temp->version = rd->version; temp->ino = rd->ino; temp->nsize = rd->nsize; temp->type = rd->type; temp->next = NULL; memcpy(temp->name, rd->name, rd->nsize); return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); } /* Cleanup every collected summary information */ static void jffs2_sum_clean_collected(struct jffs2_summary *s) { union jffs2_sum_mem *temp; if (!s->sum_list_head) { dbg_summary("already empty\n"); } while (s->sum_list_head) { temp = s->sum_list_head; s->sum_list_head = s->sum_list_head->u.next; kfree(temp); } s->sum_list_tail = NULL; s->sum_padded = 0; s->sum_num = 0; } void jffs2_sum_reset_collected(struct jffs2_summary *s) { dbg_summary("called\n"); jffs2_sum_clean_collected(s); s->sum_size = 0; } void jffs2_sum_disable_collecting(struct jffs2_summary *s) { dbg_summary("called\n"); jffs2_sum_clean_collected(s); s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; } int jffs2_sum_is_disabled(struct jffs2_summary *s) { return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE); } /* Move the collected summary information into sb (called from scan.c) */ void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s) { dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n", c->summary->sum_size, c->summary->sum_num, s->sum_size, s->sum_num); c->summary->sum_size = s->sum_size; c->summary->sum_num = s->sum_num; c->summary->sum_padded = s->sum_padded; c->summary->sum_list_head = s->sum_list_head; c->summary->sum_list_tail = s->sum_list_tail; s->sum_list_head = s->sum_list_tail = NULL; } /* Called from wbuf.c to collect writed node info */ int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, unsigned long count, uint32_t ofs) { union jffs2_node_union *node; struct jffs2_eraseblock *jeb; node = invecs[0].iov_base; jeb = &c->blocks[ofs / c->sector_size]; ofs -= jeb->offset; switch (je16_to_cpu(node->u.nodetype)) { case JFFS2_NODETYPE_INODE: { struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); if (!temp) goto no_mem; temp->nodetype = node->i.nodetype; temp->inode = node->i.ino; temp->version = node->i.version; temp->offset = cpu_to_je32(ofs); temp->totlen = node->i.totlen; temp->next = NULL; return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); } case JFFS2_NODETYPE_DIRENT: { struct jffs2_sum_dirent_mem *temp = kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL); if (!temp) goto no_mem; temp->nodetype = node->d.nodetype; temp->totlen = node->d.totlen; temp->offset = cpu_to_je32(ofs); temp->pino = node->d.pino; temp->version = node->d.version; temp->ino = node->d.ino; temp->nsize = node->d.nsize; temp->type = node->d.type; temp->next = NULL; switch (count) { case 1: memcpy(temp->name,node->d.name,node->d.nsize); break; case 2: memcpy(temp->name,invecs[1].iov_base,node->d.nsize); break; default: BUG(); /* impossible count value */ break; } return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); } case JFFS2_NODETYPE_PADDING: dbg_summary("node PADDING\n"); c->summary->sum_padded += je32_to_cpu(node->u.totlen); break; case JFFS2_NODETYPE_CLEANMARKER: dbg_summary("node CLEANMARKER\n"); break; case JFFS2_NODETYPE_SUMMARY: dbg_summary("node SUMMARY\n"); break; default: /* If you implement a new node type you should also implement summary support for it or disable summary. */ BUG(); break; } return 0; no_mem: JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); return -ENOMEM; } /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */ static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_summary *summary, uint32_t *pseudo_random) { struct jffs2_raw_node_ref *raw; struct jffs2_inode_cache *ic; struct jffs2_full_dirent *fd; void *sp; int i, ino; sp = summary->sum; for (i=0; i<je32_to_cpu(summary->sum_num); i++) { dbg_summary("processing summary index %d\n", i); switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { case JFFS2_NODETYPE_INODE: { struct jffs2_sum_inode_flash *spi; spi = sp; ino = je32_to_cpu(spi->inode); dbg_summary("Inode at 0x%08x\n", jeb->offset + je32_to_cpu(spi->offset)); raw = jffs2_alloc_raw_node_ref(); if (!raw) { JFFS2_NOTICE("allocation of node reference failed\n"); kfree(summary); return -ENOMEM; } ic = jffs2_scan_make_ino_cache(c, ino); if (!ic) { JFFS2_NOTICE("scan_make_ino_cache failed\n"); jffs2_free_raw_node_ref(raw); kfree(summary); return -ENOMEM; } raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED; raw->__totlen = PAD(je32_to_cpu(spi->totlen)); raw->next_phys = NULL; raw->next_in_ino = ic->nodes; ic->nodes = raw; if (!jeb->first_node) jeb->first_node = raw; if (jeb->last_node) jeb->last_node->next_phys = raw; jeb->last_node = raw; *pseudo_random += je32_to_cpu(spi->version); UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen))); sp += JFFS2_SUMMARY_INODE_SIZE; break; } case JFFS2_NODETYPE_DIRENT: { struct jffs2_sum_dirent_flash *spd; spd = sp; dbg_summary("Dirent at 0x%08x\n", jeb->offset + je32_to_cpu(spd->offset)); fd = jffs2_alloc_full_dirent(spd->nsize+1); if (!fd) { kfree(summary); return -ENOMEM; } memcpy(&fd->name, spd->name, spd->nsize); fd->name[spd->nsize] = 0; raw = jffs2_alloc_raw_node_ref(); if (!raw) { jffs2_free_full_dirent(fd); JFFS2_NOTICE("allocation of node reference failed\n"); kfree(summary); return -ENOMEM; } ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); if (!ic) { jffs2_free_full_dirent(fd); jffs2_free_raw_node_ref(raw); kfree(summary); return -ENOMEM; } raw->__totlen = PAD(je32_to_cpu(spd->totlen)); raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE; raw->next_phys = NULL; raw->next_in_ino = ic->nodes; ic->nodes = raw; if (!jeb->first_node) jeb->first_node = raw; if (jeb->last_node) jeb->last_node->next_phys = raw; jeb->last_node = raw; fd->raw = raw; fd->next = NULL; fd->version = je32_to_cpu(spd->version); fd->ino = je32_to_cpu(spd->ino); fd->nhash = full_name_hash(fd->name, spd->nsize); fd->type = spd->type; USED_SPACE(PAD(je32_to_cpu(spd->totlen))); jffs2_add_fd_to_list(c, fd, &ic->scan_dents); *pseudo_random += je32_to_cpu(spd->version); sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); break; } default : { JFFS2_WARNING("Unsupported node type found in summary! Exiting..."); kfree(summary); return -EIO; } } } kfree(summary); return 0; } /* Process the summary node - called from jffs2_scan_eraseblock() */ int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t ofs, uint32_t *pseudo_random) { struct jffs2_unknown_node crcnode; struct jffs2_raw_node_ref *cache_ref; struct jffs2_raw_summary *summary; int ret, sumsize; uint32_t crc; sumsize = c->sector_size - ofs; ofs += jeb->offset; dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", jeb->offset, ofs, sumsize); summary = kmalloc(sumsize, GFP_KERNEL); if (!summary) { return -ENOMEM; } ret = jffs2_fill_scan_buf(c, (unsigned char *)summary, ofs, sumsize); if (ret) { kfree(summary); return ret; } /* OK, now check for node validity and CRC */ crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); crcnode.totlen = summary->totlen; crc = crc32(0, &crcnode, sizeof(crcnode)-4); if (je32_to_cpu(summary->hdr_crc) != crc) { dbg_summary("Summary node header is corrupt (bad CRC or " "no summary at all)\n"); goto crc_err; } if (je32_to_cpu(summary->totlen) != sumsize) { dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); goto crc_err; } crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); if (je32_to_cpu(summary->node_crc) != crc) { dbg_summary("Summary node is corrupt (bad CRC)\n"); goto crc_err; } crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); if (je32_to_cpu(summary->sum_crc) != crc) { dbg_summary("Summary node data is corrupt (bad CRC)\n"); goto crc_err; } if ( je32_to_cpu(summary->cln_mkr) ) { dbg_summary("Summary : CLEANMARKER node \n"); if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr))); } else if (jeb->first_node) { dbg_summary("CLEANMARKER node not first node in block " "(0x%08x)\n", jeb->offset); UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr))); } else { struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref(); if (!marker_ref) { JFFS2_NOTICE("Failed to allocate node ref for clean marker\n"); kfree(summary); return -ENOMEM; } marker_ref->next_in_ino = NULL; marker_ref->next_phys = NULL; marker_ref->flash_offset = jeb->offset | REF_NORMAL; marker_ref->__totlen = je32_to_cpu(summary->cln_mkr); jeb->first_node = jeb->last_node = marker_ref; USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) ); } } if (je32_to_cpu(summary->padded)) { DIRTY_SPACE(je32_to_cpu(summary->padded)); } ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); if (ret) return ret; /* for PARANOIA_CHECK */ cache_ref = jffs2_alloc_raw_node_ref(); if (!cache_ref) { JFFS2_NOTICE("Failed to allocate node ref for cache\n"); return -ENOMEM; } cache_ref->next_in_ino = NULL; cache_ref->next_phys = NULL; cache_ref->flash_offset = ofs | REF_NORMAL; cache_ref->__totlen = sumsize; if (!jeb->first_node) jeb->first_node = cache_ref; if (jeb->last_node) jeb->last_node->next_phys = cache_ref; jeb->last_node = cache_ref; USED_SPACE(sumsize); jeb->wasted_size += jeb->free_size; c->wasted_size += jeb->free_size; c->free_size -= jeb->free_size; jeb->free_size = 0; return jffs2_scan_classify_jeb(c, jeb); crc_err: JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); return 0; } /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t infosize, uint32_t datasize, int padsize) { struct jffs2_raw_summary isum; union jffs2_sum_mem *temp; struct jffs2_sum_marker *sm; struct kvec vecs[2]; void *wpage; int ret; size_t retlen; memset(c->summary->sum_buf, 0xff, datasize); memset(&isum, 0, sizeof(isum)); isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); isum.totlen = cpu_to_je32(infosize); isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); isum.padded = cpu_to_je32(c->summary->sum_padded); isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); isum.sum_num = cpu_to_je32(c->summary->sum_num); wpage = c->summary->sum_buf; while (c->summary->sum_num) { switch (je16_to_cpu(c->summary->sum_list_head->u.nodetype)) { case JFFS2_NODETYPE_INODE: { struct jffs2_sum_inode_flash *sino_ptr = wpage; sino_ptr->nodetype = c->summary->sum_list_head->i.nodetype; sino_ptr->inode = c->summary->sum_list_head->i.inode; sino_ptr->version = c->summary->sum_list_head->i.version; sino_ptr->offset = c->summary->sum_list_head->i.offset; sino_ptr->totlen = c->summary->sum_list_head->i.totlen; wpage += JFFS2_SUMMARY_INODE_SIZE; break; } case JFFS2_NODETYPE_DIRENT: { struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; sdrnt_ptr->nodetype = c->summary->sum_list_head->d.nodetype; sdrnt_ptr->totlen = c->summary->sum_list_head->d.totlen; sdrnt_ptr->offset = c->summary->sum_list_head->d.offset; sdrnt_ptr->pino = c->summary->sum_list_head->d.pino; sdrnt_ptr->version = c->summary->sum_list_head->d.version; sdrnt_ptr->ino = c->summary->sum_list_head->d.ino; sdrnt_ptr->nsize = c->summary->sum_list_head->d.nsize; sdrnt_ptr->type = c->summary->sum_list_head->d.type; memcpy(sdrnt_ptr->name, c->summary->sum_list_head->d.name, c->summary->sum_list_head->d.nsize); wpage += JFFS2_SUMMARY_DIRENT_SIZE(c->summary->sum_list_head->d.nsize); break; } default : { BUG(); /* unknown node in summary information */ } } temp = c->summary->sum_list_head; c->summary->sum_list_head = c->summary->sum_list_head->u.next; kfree(temp); c->summary->sum_num--; } jffs2_sum_reset_collected(c->summary); wpage += padsize; sm = wpage; sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); vecs[0].iov_base = &isum; vecs[0].iov_len = sizeof(isum); vecs[1].iov_base = c->summary->sum_buf; vecs[1].iov_len = datasize; dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n", jeb->offset + c->sector_size - jeb->free_size); spin_unlock(&c->erase_completion_lock); ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size - jeb->free_size, &retlen, 0); spin_lock(&c->erase_completion_lock); if (ret || (retlen != infosize)) { JFFS2_WARNING("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen); c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; WASTED_SPACE(infosize); return 1; } return 0; } /* Write out summary information - called from jffs2_do_reserve_space */ int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) { struct jffs2_raw_node_ref *summary_ref; int datasize, infosize, padsize, ret; struct jffs2_eraseblock *jeb; dbg_summary("called\n"); jeb = c->nextblock; if (!c->summary->sum_num || !c->summary->sum_list_head) { JFFS2_WARNING("Empty summary info!!!\n"); BUG(); } datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); infosize = sizeof(struct jffs2_raw_summary) + datasize; padsize = jeb->free_size - infosize; infosize += padsize; datasize += padsize; /* Is there enough space for summary? */ if (padsize < 0) { /* don't try to write out summary for this jeb */ jffs2_sum_disable_collecting(c->summary); JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize); return 0; } ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); if (ret) return 0; /* can't write out summary, block is marked as NOSUM_SIZE */ /* for ACCT_PARANOIA_CHECK */ spin_unlock(&c->erase_completion_lock); summary_ref = jffs2_alloc_raw_node_ref(); spin_lock(&c->erase_completion_lock); if (!summary_ref) { JFFS2_NOTICE("Failed to allocate node ref for summary\n"); return -ENOMEM; } summary_ref->next_in_ino = NULL; summary_ref->next_phys = NULL; summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL; summary_ref->__totlen = infosize; if (!jeb->first_node) jeb->first_node = summary_ref; if (jeb->last_node) jeb->last_node->next_phys = summary_ref; jeb->last_node = summary_ref; USED_SPACE(infosize); return 0; }