int jffs2_scan_medium(struct jffs2_sb_info *c) { int i, ret; uint32_t empty_blocks = 0, bad_blocks = 0; unsigned char *flashbuf = NULL; uint32_t buf_size = 0; struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ #ifndef __ECOS size_t pointlen; if (c->mtd->point) { ret = c->mtd->point(c->mtd, 0, c->mtd->size, &pointlen, (void **)&flashbuf, NULL); if (!ret && pointlen < c->mtd->size) { /* Don't muck about if it won't let us point to the whole flash */ D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen)); c->mtd->unpoint(c->mtd, 0, pointlen); flashbuf = NULL; } if (ret) D1(printk(KERN_DEBUG "MTD point failed %d\n", ret)); } #endif if (!flashbuf) { /* For NAND it's quicker to read a whole eraseblock at a time, apparently */ if (c->mtd->type == MTD_NANDFLASH) buf_size = c->sector_size; else buf_size = PAGE_SIZE; /* Respect kmalloc limitations */ if (buf_size > 128*1024) buf_size = 128*1024; D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size)); flashbuf = kmalloc(buf_size, GFP_KERNEL); if (!flashbuf) return -ENOMEM; } if (jffs2_sum_active()) { s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); if (!s) { JFFS2_WARNING("Can't allocate memory for summary\n"); ret = -ENOMEM; goto out; } } for (i=0; i<c->nr_blocks; i++) { struct jffs2_eraseblock *jeb = &c->blocks[i]; cond_resched(); /* reset summary info for next eraseblock scan */ jffs2_sum_reset_collected(s); ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), buf_size, s); if (ret < 0) goto out; jffs2_dbg_acct_paranoia_check_nolock(c, jeb); /* Now decide which list to put it on */ switch(ret) { case BLK_STATE_ALLFF: /* * Empty block. Since we can't be sure it * was entirely erased, we just queue it for erase * again. It will be marked as such when the erase * is complete. Meanwhile we still count it as empty * for later checks. */ empty_blocks++; list_add(&jeb->list, &c->erase_pending_list); c->nr_erasing_blocks++; break; case BLK_STATE_CLEANMARKER: /* Only a CLEANMARKER node is valid */ if (!jeb->dirty_size) { /* It's actually free */ list_add(&jeb->list, &c->free_list); c->nr_free_blocks++; } else { /* Dirt */ D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset)); list_add(&jeb->list, &c->erase_pending_list); c->nr_erasing_blocks++; } break; case BLK_STATE_CLEAN: /* Full (or almost full) of clean data. Clean list */ list_add(&jeb->list, &c->clean_list); break; case BLK_STATE_PARTDIRTY: /* Some data, but not full. Dirty list. */ /* We want to remember the block with most free space and stick it in the 'nextblock' position to start writing to it. */ if (jeb->free_size > min_free(c) && (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { /* Better candidate for the next writes to go to */ if (c->nextblock) { ret = file_dirty(c, c->nextblock); if (ret) goto out; /* deleting summary information of the old nextblock */ jffs2_sum_reset_collected(c->summary); } /* update collected summary information for the current nextblock */ jffs2_sum_move_collected(c, s); D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset)); c->nextblock = jeb; } else { ret = file_dirty(c, jeb); if (ret) goto out; } break; case BLK_STATE_ALLDIRTY: /* Nothing valid - not even a clean marker. Needs erasing. */ /* For now we just put it on the erasing list. We'll start the erases later */ D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset)); list_add(&jeb->list, &c->erase_pending_list); c->nr_erasing_blocks++; break; case BLK_STATE_BADBLOCK: D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset)); list_add(&jeb->list, &c->bad_list); c->bad_size += c->sector_size; c->free_size -= c->sector_size; bad_blocks++; break; default: printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n"); BUG(); } } /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */ if (c->nextblock && (c->nextblock->dirty_size)) { c->nextblock->wasted_size += c->nextblock->dirty_size; c->wasted_size += c->nextblock->dirty_size; c->dirty_size -= c->nextblock->dirty_size; c->nextblock->dirty_size = 0; } #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { /* If we're going to start writing into a block which already contains data, and the end of the data isn't page-aligned, skip a little and align it. */ uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n", skip)); jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); jffs2_scan_dirty_space(c, c->nextblock, skip); } #endif if (c->nr_erasing_blocks) { if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks); ret = -EIO; goto out; } spin_lock(&c->erase_completion_lock); jffs2_garbage_collect_trigger(c); spin_unlock(&c->erase_completion_lock); } ret = 0; out: if (buf_size) kfree(flashbuf); #ifndef __ECOS else c->mtd->unpoint(c->mtd, 0, c->mtd->size); #endif if (s) kfree(s); return ret; }
/* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into the flash, XIP-style */ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { struct jffs2_unknown_node *node; struct jffs2_unknown_node crcnode; uint32_t ofs, prevofs, max_ofs; uint32_t hdr_crc, buf_ofs, buf_len; int err; int noise = 0; #ifdef CONFIG_JFFS2_FS_WRITEBUFFER int cleanmarkerfound = 0; #endif ofs = jeb->offset; prevofs = jeb->offset - 1; D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs)); #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (c->mtd->type == MTD_NANDFLASH) { int ret; if (c->mtd->block_isbad(c->mtd, jeb->offset)) return BLK_STATE_BADBLOCK; if (jffs2_cleanmarker_oob(c)) { ret = jffs2_check_nand_cleanmarker(c, jeb); D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n", ret)); /* Even if it's not found, we still scan to see if the block is empty. We use this information to decide whether to erase it or not. */ switch (ret) { case 0: cleanmarkerfound = 1; break; case 1: break; default: return ret; } } } #endif if (jffs2_sum_active()) { struct jffs2_sum_marker *sm; void *sumptr = NULL; uint32_t sumlen; if (!buf_size) { /* XIP case. Just look, point at the summary if it's there */ sm = (void *)buf + c->sector_size - sizeof(*sm); if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { sumptr = buf + je32_to_cpu(sm->offset); sumlen = c->sector_size - je32_to_cpu(sm->offset); } } else { /* If NAND flash, read a whole page of it. Else just the end */ if (c->wbuf_pagesize) buf_len = c->wbuf_pagesize; else buf_len = sizeof(*sm); /* Read as much as we want into the _end_ of the preallocated buffer */ err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, jeb->offset + c->sector_size - buf_len, buf_len); if (err) return err; sm = (void *)buf + buf_size - sizeof(*sm); if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { sumlen = c->sector_size - je32_to_cpu(sm->offset); sumptr = buf + buf_size - sumlen; /* Now, make sure the summary itself is available */ if (sumlen > buf_size) { /* Need to kmalloc for this. */ sumptr = kmalloc(sumlen, GFP_KERNEL); if (!sumptr) return -ENOMEM; memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); } if (buf_len < sumlen) { /* Need to read more so that the entire summary node is present */ err = jffs2_fill_scan_buf(c, sumptr, jeb->offset + c->sector_size - sumlen, sumlen - buf_len); if (err) return err; } } } if (sumptr) { err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); if (buf_size && sumlen > buf_size) kfree(sumptr); /* If it returns with a real error, bail. If it returns positive, that's a block classification (i.e. BLK_STATE_xxx) so return that too. If it returns zero, fall through to full scan. */ if (err) return err; } } buf_ofs = jeb->offset; if (!buf_size) { /* This is the XIP case -- we're reading _directly_ from the flash chip */ buf_len = c->sector_size; } else { buf_len = EMPTY_SCAN_SIZE(c->sector_size); err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); if (err) return err; } /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ ofs = 0; max_ofs = EMPTY_SCAN_SIZE(c->sector_size); /* Scan only EMPTY_SCAN_SIZE of 0xFF before declaring it's empty */ while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) ofs += 4; if (ofs == max_ofs) { #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (jffs2_cleanmarker_oob(c)) { /* scan oob, take care of cleanmarker */ int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret)); switch (ret) { case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; case 1: return BLK_STATE_ALLDIRTY; default: return ret; } } #endif D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset)); if (c->cleanmarker_size == 0) return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ else return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ } if (ofs) { D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset, jeb->offset + ofs)); if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1))) return err; if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) return err; } /* Now ofs is a complete physical flash offset as it always was... */ ofs += jeb->offset; noise = 10; dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); scan_more: while(ofs < jeb->offset + c->sector_size) { jffs2_dbg_acct_paranoia_check_nolock(c, jeb); /* Make sure there are node refs available for use */ err = jffs2_prealloc_raw_node_refs(c, jeb, 2); if (err) return err; cond_resched(); if (ofs & 3) { printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs); ofs = PAD(ofs); continue; } if (ofs == prevofs) { printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } prevofs = ofs; if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node), jeb->offset, c->sector_size, ofs, sizeof(*node))); if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) return err; break; } if (buf_ofs + buf_len < ofs + sizeof(*node)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", sizeof(struct jffs2_unknown_node), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; } node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { uint32_t inbuf_ofs; uint32_t empty_start, scan_end; empty_start = ofs; ofs += 4; scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len); D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); more_empty: inbuf_ofs = ofs - buf_ofs; while (inbuf_ofs < scan_end) { if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) { printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", empty_start, ofs); if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) return err; goto scan_more; } inbuf_ofs+=4; ofs += 4; } /* Ran off end. */ D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs)); /* If we're only checking the beginning of a block with a cleanmarker, bail now */ if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) { D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); return BLK_STATE_CLEANMARKER; } if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */ scan_end = buf_len; goto more_empty; } /* See how much more there is to read in this eraseblock... */ buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); if (!buf_len) { /* No more to read. Break out of main loop without marking this range of empty space as dirty (because it's not) */ D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n", empty_start)); break; } /* point never reaches here */ scan_end = buf_len; D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; goto more_empty; } if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs)); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs); printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n"); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { /* OK. We're out of possibilities. Whinge and move on */ noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", JFFS2_MAGIC_BITMASK, ofs, je16_to_cpu(node->magic)); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } /* We seem to have a node of sorts. Check the CRC */ crcnode.magic = node->magic; crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); crcnode.totlen = node->totlen; hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); if (hdr_crc != je32_to_cpu(node->hdr_crc)) { noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n", ofs, je16_to_cpu(node->magic), je16_to_cpu(node->nodetype), je32_to_cpu(node->totlen), je32_to_cpu(node->hdr_crc), hdr_crc); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) { /* Eep. Node goes over the end of the erase block. */ printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", ofs, je32_to_cpu(node->totlen)); printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n"); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { /* Wheee. This is an obsoleted node */ D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs)); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); continue; } switch(je16_to_cpu(node->nodetype)) { case JFFS2_NODETYPE_INODE: if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", sizeof(struct jffs2_raw_inode), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_NODETYPE_DIRENT: if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", je32_to_cpu(node->totlen), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; #ifdef CONFIG_JFFS2_FS_XATTR case JFFS2_NODETYPE_XATTR: if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)" " left to end of buf. Reading 0x%x at 0x%08x\n", je32_to_cpu(node->totlen), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_NODETYPE_XREF: if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)" " left to end of buf. Reading 0x%x at 0x%08x\n", je32_to_cpu(node->totlen), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; #endif /* CONFIG_JFFS2_FS_XATTR */ case JFFS2_NODETYPE_CLEANMARKER: D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs)); if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) return err; ofs += PAD(sizeof(struct jffs2_unknown_node)); } else if (jeb->first_node) { printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) return err; ofs += PAD(sizeof(struct jffs2_unknown_node)); } else { jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL); ofs += PAD(c->cleanmarker_size); } break; case JFFS2_NODETYPE_PADDING: if (jffs2_sum_active()) jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; default: switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { case JFFS2_FEATURE_ROCOMPAT: printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); c->flags |= JFFS2_SB_FLAG_RO; if (!(jffs2_is_readonly(c))) return -EROFS; if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_FEATURE_INCOMPAT: printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); return -EINVAL; case JFFS2_FEATURE_RWCOMPAT_DELETE: D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_FEATURE_RWCOMPAT_COPY: { D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL); /* We can't summarise nodes we don't grok */ jffs2_sum_disable_collecting(s); ofs += PAD(je32_to_cpu(node->totlen)); break; } } } } if (jffs2_sum_active()) { if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { dbg_summary("There is not enough space for " "summary information, disabling for this jeb!\n"); jffs2_sum_disable_collecting(s); } } D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n", jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size)); /* mark_node_obsolete can add to wasted !! */ if (jeb->wasted_size) { jeb->dirty_size += jeb->wasted_size; c->dirty_size += jeb->wasted_size; c->wasted_size -= jeb->wasted_size; jeb->wasted_size = 0; } return jffs2_scan_classify_jeb(c, jeb); }
/* * Check the data CRC of the node. * * Returns: 0 if the data CRC is correct; * 1 - if incorrect; * error code if an error occurred. */ static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) { struct jffs2_raw_node_ref *ref = tn->fn->raw; int err = 0, pointed = 0; struct jffs2_eraseblock *jeb; unsigned char *buffer; uint32_t crc, ofs, len; size_t retlen; BUG_ON(tn->csize == 0); /* Calculate how many bytes were already checked */ ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode); len = tn->csize; if (jffs2_is_writebuffered(c)) { int adj = ofs % c->wbuf_pagesize; if (likely(adj)) adj = c->wbuf_pagesize - adj; if (adj >= tn->csize) { dbg_readinode("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n", ref_offset(ref), tn->csize, ofs); goto adj_acc; } ofs += adj; len -= adj; } dbg_readinode("check node at %#08x, data length %u, partial CRC %#08x, correct CRC %#08x, data starts at %#08x, start checking from %#08x - %u bytes.\n", ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len); #ifndef __ECOS /* TODO: instead, incapsulate point() stuff to jffs2_flash_read(), * adding and jffs2_flash_read_end() interface. */ err = mtd_point(c->mtd, ofs, len, &retlen, (void **)&buffer, NULL); if (!err && retlen < len) { JFFS2_WARNING("MTD point returned len too short: %zu instead of %u.\n", retlen, tn->csize); mtd_unpoint(c->mtd, ofs, retlen); } else if (err) { if (err != -EOPNOTSUPP) JFFS2_WARNING("MTD point failed: error code %d.\n", err); } else pointed = 1; /* succefully pointed to device */ #endif if (!pointed) { buffer = kmalloc(len, GFP_KERNEL); if (unlikely(!buffer)) return -ENOMEM; /* TODO: this is very frequent pattern, make it a separate * routine */ err = jffs2_flash_read(c, ofs, len, &retlen, buffer); if (err) { JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err); goto free_out; } if (retlen != len) { JFFS2_ERROR("short read at %#08x: %zd instead of %d.\n", ofs, retlen, len); err = -EIO; goto free_out; } } /* Continue calculating CRC */ crc = crc32(tn->partial_crc, buffer, len); if(!pointed) kfree(buffer); #ifndef __ECOS else mtd_unpoint(c->mtd, ofs, len); #endif if (crc != tn->data_crc) { JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", ref_offset(ref), tn->data_crc, crc); return 1; } adj_acc: jeb = &c->blocks[ref->flash_offset / c->sector_size]; len = ref_totlen(c, jeb, ref); /* If it should be REF_NORMAL, it'll get marked as such when we build the fragtree, shortly. No need to worry about GC moving it while it's marked REF_PRISTINE -- GC won't happen till we've finished checking every inode anyway. */ ref->flash_offset |= REF_PRISTINE; /* * Mark the node as having been checked and fix the * accounting accordingly. */ spin_lock(&c->erase_completion_lock); jeb->used_size += len; jeb->unchecked_size -= len; c->used_size += len; c->unchecked_size -= len; jffs2_dbg_acct_paranoia_check_nolock(c, jeb); spin_unlock(&c->erase_completion_lock); return 0; free_out: if(!pointed) kfree(buffer); #ifndef __ECOS else mtd_unpoint(c->mtd, ofs, len); #endif return err; }
int jffs2_scan_medium(struct jffs2_sb_info *c) { int i, ret; uint32_t empty_blocks = 0, bad_blocks = 0; unsigned char *flashbuf = NULL; uint32_t buf_size = 0; struct jffs2_summary *s = NULL; #ifndef __ECOS size_t pointlen, try_size; ret = mtd_point(c->mtd, 0, c->mtd->size, &pointlen, (void **)&flashbuf, NULL); if (!ret && pointlen < c->mtd->size) { jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n", pointlen); mtd_unpoint(c->mtd, 0, pointlen); flashbuf = NULL; } if (ret && ret != -EOPNOTSUPP) jffs2_dbg(1, "MTD point failed %d\n", ret); #endif if (!flashbuf) { if (jffs2_cleanmarker_oob(c)) try_size = c->sector_size; else try_size = PAGE_SIZE; jffs2_dbg(1, "Trying to allocate readbuf of %zu " "bytes\n", try_size); flashbuf = mtd_kmalloc_up_to(c->mtd, &try_size); if (!flashbuf) return -ENOMEM; jffs2_dbg(1, "Allocated readbuf of %zu bytes\n", try_size); buf_size = (uint32_t)try_size; } if (jffs2_sum_active()) { s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); if (!s) { JFFS2_WARNING("Can't allocate memory for summary\n"); ret = -ENOMEM; goto out; } } for (i=0; i<c->nr_blocks; i++) { struct jffs2_eraseblock *jeb = &c->blocks[i]; cond_resched(); jffs2_sum_reset_collected(s); ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), buf_size, s); if (ret < 0) goto out; jffs2_dbg_acct_paranoia_check_nolock(c, jeb); switch(ret) { case BLK_STATE_ALLFF: empty_blocks++; list_add(&jeb->list, &c->erase_pending_list); c->nr_erasing_blocks++; break; case BLK_STATE_CLEANMARKER: if (!jeb->dirty_size) { list_add(&jeb->list, &c->free_list); c->nr_free_blocks++; } else { jffs2_dbg(1, "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset); list_add(&jeb->list, &c->erase_pending_list); c->nr_erasing_blocks++; } break; case BLK_STATE_CLEAN: list_add(&jeb->list, &c->clean_list); break; case BLK_STATE_PARTDIRTY: if (jeb->free_size > min_free(c) && (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { if (c->nextblock) { ret = file_dirty(c, c->nextblock); if (ret) goto out; jffs2_sum_reset_collected(c->summary); } jffs2_sum_move_collected(c, s); jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n", __func__, jeb->offset); c->nextblock = jeb; } else { ret = file_dirty(c, jeb); if (ret) goto out; } break; case BLK_STATE_ALLDIRTY: jffs2_dbg(1, "Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset); list_add(&jeb->list, &c->erase_pending_list); c->nr_erasing_blocks++; break; case BLK_STATE_BADBLOCK: jffs2_dbg(1, "Block at 0x%08x is bad\n", jeb->offset); list_add(&jeb->list, &c->bad_list); c->bad_size += c->sector_size; c->free_size -= c->sector_size; bad_blocks++; break; default: pr_warn("%s(): unknown block state\n", __func__); BUG(); } } if (c->nextblock && (c->nextblock->dirty_size)) { c->nextblock->wasted_size += c->nextblock->dirty_size; c->wasted_size += c->nextblock->dirty_size; c->dirty_size -= c->nextblock->dirty_size; c->nextblock->dirty_size = 0; } #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; jffs2_dbg(1, "%s(): Skipping %d bytes in nextblock to ensure page alignment\n", __func__, skip); jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); jffs2_scan_dirty_space(c, c->nextblock, skip); } #endif if (c->nr_erasing_blocks) { if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { pr_notice("Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); pr_notice("empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n", empty_blocks, bad_blocks, c->nr_blocks); ret = -EIO; goto out; } spin_lock(&c->erase_completion_lock); jffs2_garbage_collect_trigger(c); spin_unlock(&c->erase_completion_lock); } ret = 0; out: if (buf_size) kfree(flashbuf); #ifndef __ECOS else mtd_unpoint(c->mtd, 0, c->mtd->size); #endif kfree(s); return ret; }
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { struct jffs2_unknown_node *node; struct jffs2_unknown_node crcnode; uint32_t ofs, prevofs, max_ofs; uint32_t hdr_crc, buf_ofs, buf_len; int err; int noise = 0; #ifdef CONFIG_JFFS2_FS_WRITEBUFFER int cleanmarkerfound = 0; #endif ofs = jeb->offset; prevofs = jeb->offset - 1; jffs2_dbg(1, "%s(): Scanning block at 0x%x\n", __func__, ofs); #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (jffs2_cleanmarker_oob(c)) { int ret; if (mtd_block_isbad(c->mtd, jeb->offset)) return BLK_STATE_BADBLOCK; ret = jffs2_check_nand_cleanmarker(c, jeb); jffs2_dbg(2, "jffs_check_nand_cleanmarker returned %d\n", ret); switch (ret) { case 0: cleanmarkerfound = 1; break; case 1: break; default: return ret; } } #endif if (jffs2_sum_active()) { struct jffs2_sum_marker *sm; void *sumptr = NULL; uint32_t sumlen; if (!buf_size) { sm = (void *)buf + c->sector_size - sizeof(*sm); if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { sumptr = buf + je32_to_cpu(sm->offset); sumlen = c->sector_size - je32_to_cpu(sm->offset); } } else { if (c->wbuf_pagesize) buf_len = c->wbuf_pagesize; else buf_len = sizeof(*sm); err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, jeb->offset + c->sector_size - buf_len, buf_len); if (err) return err; sm = (void *)buf + buf_size - sizeof(*sm); if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { sumlen = c->sector_size - je32_to_cpu(sm->offset); sumptr = buf + buf_size - sumlen; if (sumlen > buf_size) { sumptr = kmalloc(sumlen, GFP_KERNEL); if (!sumptr) return -ENOMEM; memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); } if (buf_len < sumlen) { err = jffs2_fill_scan_buf(c, sumptr, jeb->offset + c->sector_size - sumlen, sumlen - buf_len); if (err) return err; } } } if (sumptr) { err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); if (buf_size && sumlen > buf_size) kfree(sumptr); if (err) return err; } } buf_ofs = jeb->offset; if (!buf_size) { buf_len = c->sector_size; } else { buf_len = EMPTY_SCAN_SIZE(c->sector_size); err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); if (err) return err; } ofs = 0; max_ofs = EMPTY_SCAN_SIZE(c->sector_size); while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) ofs += 4; if (ofs == max_ofs) { #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (jffs2_cleanmarker_oob(c)) { int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); jffs2_dbg(2, "jffs2_check_oob_empty returned %d\n", ret); switch (ret) { case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; case 1: return BLK_STATE_ALLDIRTY; default: return ret; } } #endif jffs2_dbg(1, "Block at 0x%08x is empty (erased)\n", jeb->offset); if (c->cleanmarker_size == 0) return BLK_STATE_CLEANMARKER; else return BLK_STATE_ALLFF; } if (ofs) { jffs2_dbg(1, "Free space at %08x ends at %08x\n", jeb->offset, jeb->offset + ofs); if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1))) return err; if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) return err; } ofs += jeb->offset; noise = 10; dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); scan_more: while(ofs < jeb->offset + c->sector_size) { jffs2_dbg_acct_paranoia_check_nolock(c, jeb); err = jffs2_prealloc_raw_node_refs(c, jeb, 2); if (err) return err; cond_resched(); if (ofs & 3) { pr_warn("Eep. ofs 0x%08x not word-aligned!\n", ofs); ofs = PAD(ofs); continue; } if (ofs == prevofs) { pr_warn("ofs 0x%08x has already been seen. Skipping\n", ofs); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } prevofs = ofs; if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { jffs2_dbg(1, "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node), jeb->offset, c->sector_size, ofs, sizeof(*node)); if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) return err; break; } if (buf_ofs + buf_len < ofs + sizeof(*node)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); jffs2_dbg(1, "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", sizeof(struct jffs2_unknown_node), buf_len, ofs); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; } node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { uint32_t inbuf_ofs; uint32_t empty_start, scan_end; empty_start = ofs; ofs += 4; scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len); jffs2_dbg(1, "Found empty flash at 0x%08x\n", ofs); more_empty: inbuf_ofs = ofs - buf_ofs; while (inbuf_ofs < scan_end) { if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) { pr_warn("Empty flash at 0x%08x ends at 0x%08x\n", empty_start, ofs); if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) return err; goto scan_more; } inbuf_ofs+=4; ofs += 4; } jffs2_dbg(1, "Empty flash to end of buffer at 0x%08x\n", ofs); if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) { jffs2_dbg(1, "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)); return BLK_STATE_CLEANMARKER; } if (!buf_size && (scan_end != buf_len)) { scan_end = buf_len; goto more_empty; } buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); if (!buf_len) { jffs2_dbg(1, "Empty flash at %08x runs to end of block. Treating as free_space\n", empty_start); break; } scan_end = buf_len; jffs2_dbg(1, "Reading another 0x%x at 0x%08x\n", buf_len, ofs); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; goto more_empty; } if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { pr_warn("Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { jffs2_dbg(1, "Dirty bitmask at 0x%08x\n", ofs); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { pr_warn("Old JFFS2 bitmask found at 0x%08x\n", ofs); pr_warn("You cannot use older JFFS2 filesystems with newer kernels\n"); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { noisy_printk(&noise, "%s(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", __func__, JFFS2_MAGIC_BITMASK, ofs, je16_to_cpu(node->magic)); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } crcnode.magic = node->magic; crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); crcnode.totlen = node->totlen; hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); if (hdr_crc != je32_to_cpu(node->hdr_crc)) { noisy_printk(&noise, "%s(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n", __func__, ofs, je16_to_cpu(node->magic), je16_to_cpu(node->nodetype), je32_to_cpu(node->totlen), je32_to_cpu(node->hdr_crc), hdr_crc); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) { pr_warn("Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", ofs, je32_to_cpu(node->totlen)); pr_warn("Perhaps the file system was created with the wrong erase size?\n"); if ((err = jffs2_scan_dirty_space(c, jeb, 4))) return err; ofs += 4; continue; } if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { jffs2_dbg(2, "Node at 0x%08x is obsolete. Skipping\n", ofs); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); continue; } switch(je16_to_cpu(node->nodetype)) { case JFFS2_NODETYPE_INODE: if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); jffs2_dbg(1, "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", sizeof(struct jffs2_raw_inode), buf_len, ofs); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_NODETYPE_DIRENT: if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); jffs2_dbg(1, "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", je32_to_cpu(node->totlen), buf_len, ofs); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; #ifdef CONFIG_JFFS2_FS_XATTR case JFFS2_NODETYPE_XATTR: if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); jffs2_dbg(1, "Fewer than %d bytes (xattr node) left to end of buf. Reading 0x%x at 0x%08x\n", je32_to_cpu(node->totlen), buf_len, ofs); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_NODETYPE_XREF: if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); jffs2_dbg(1, "Fewer than %d bytes (xref node) left to end of buf. Reading 0x%x at 0x%08x\n", je32_to_cpu(node->totlen), buf_len, ofs); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; #endif case JFFS2_NODETYPE_CLEANMARKER: jffs2_dbg(1, "CLEANMARKER node found at 0x%08x\n", ofs); if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { pr_notice("CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) return err; ofs += PAD(sizeof(struct jffs2_unknown_node)); } else if (jeb->first_node) { pr_notice("CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) return err; ofs += PAD(sizeof(struct jffs2_unknown_node)); } else { jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL); ofs += PAD(c->cleanmarker_size); } break; case JFFS2_NODETYPE_PADDING: if (jffs2_sum_active()) jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; default: switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { case JFFS2_FEATURE_ROCOMPAT: pr_notice("Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); c->flags |= JFFS2_SB_FLAG_RO; if (!(jffs2_is_readonly(c))) return -EROFS; if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_FEATURE_INCOMPAT: pr_notice("Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); return -EINVAL; case JFFS2_FEATURE_RWCOMPAT_DELETE: jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_FEATURE_RWCOMPAT_COPY: { jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL); jffs2_sum_disable_collecting(s); ofs += PAD(je32_to_cpu(node->totlen)); break; } } } } if (jffs2_sum_active()) { if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { dbg_summary("There is not enough space for " "summary information, disabling for this jeb!\n"); jffs2_sum_disable_collecting(s); } } jffs2_dbg(1, "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n", jeb->offset, jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size); if (jeb->wasted_size) { jeb->dirty_size += jeb->wasted_size; c->dirty_size += jeb->wasted_size; c->wasted_size -= jeb->wasted_size; jeb->wasted_size = 0; } return jffs2_scan_classify_jeb(c, jeb); }
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, unsigned char *buf, uint32_t buf_size) { struct jffs2_unknown_node *node; struct jffs2_unknown_node crcnode; uint32_t ofs, prevofs; uint32_t hdr_crc, buf_ofs, buf_len; int err; int noise = 0; #ifdef CONFIG_JFFS2_FS_WRITEBUFFER int cleanmarkerfound = 0; #endif ofs = jeb->offset; prevofs = jeb->offset - 1; D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs)); #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (jffs2_cleanmarker_oob(c)) { int ret = jffs2_check_nand_cleanmarker(c, jeb); D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret)); /* Even if it's not found, we still scan to see if the block is empty. We use this information to decide whether to erase it or not. */ switch (ret) { case 0: cleanmarkerfound = 1; break; case 1: break; case 2: return BLK_STATE_BADBLOCK; case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */ default: return ret; } } #endif buf_ofs = jeb->offset; if (!buf_size) { buf_len = c->sector_size; } else { buf_len = EMPTY_SCAN_SIZE(c->sector_size); err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); if (err) return err; } /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ ofs = 0; /* Scan only 4KiB of 0xFF before declaring it's empty */ while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) ofs += 4; if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) { #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (jffs2_cleanmarker_oob(c)) { /* scan oob, take care of cleanmarker */ int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret)); switch (ret) { case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; case 1: return BLK_STATE_ALLDIRTY; default: return ret; } } #endif D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset)); if (c->cleanmarker_size == 0) return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ else return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ } if (ofs) { D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset, jeb->offset + ofs)); DIRTY_SPACE(ofs); } /* Now ofs is a complete physical flash offset as it always was... */ ofs += jeb->offset; noise = 10; scan_more: while(ofs < jeb->offset + c->sector_size) { jffs2_dbg_acct_paranoia_check_nolock(c, jeb); cond_resched(); if (ofs & 3) { printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs); ofs = PAD(ofs); continue; } if (ofs == prevofs) { printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs); DIRTY_SPACE(4); ofs += 4; continue; } prevofs = ofs; if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node), jeb->offset, c->sector_size, ofs, sizeof(*node))); DIRTY_SPACE((jeb->offset + c->sector_size)-ofs); break; } if (buf_ofs + buf_len < ofs + sizeof(*node)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", sizeof(struct jffs2_unknown_node), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; } node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { uint32_t inbuf_ofs; uint32_t empty_start; empty_start = ofs; ofs += 4; D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); more_empty: inbuf_ofs = ofs - buf_ofs; while (inbuf_ofs < buf_len) { if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff) { printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", empty_start, ofs); DIRTY_SPACE(ofs-empty_start); goto scan_more; } inbuf_ofs+=4; ofs += 4; } /* Ran off end. */ D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs)); /* If we're only checking the beginning of a block with a cleanmarker, bail now */ if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && c->cleanmarker_size && !jeb->dirty_size && !jeb->first_node->next_phys) { D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); return BLK_STATE_CLEANMARKER; } /* See how much more there is to read in this eraseblock... */ buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); if (!buf_len) { /* No more to read. Break out of main loop without marking this range of empty space as dirty (because it's not) */ D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n", empty_start)); break; } D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; goto more_empty; } if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); DIRTY_SPACE(4); ofs += 4; continue; } if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs)); DIRTY_SPACE(4); ofs += 4; continue; } if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs); printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n"); DIRTY_SPACE(4); ofs += 4; continue; } if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { /* OK. We're out of possibilities. Whinge and move on */ noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", JFFS2_MAGIC_BITMASK, ofs, je16_to_cpu(node->magic)); DIRTY_SPACE(4); ofs += 4; continue; } /* We seem to have a node of sorts. Check the CRC */ crcnode.magic = node->magic; crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); crcnode.totlen = node->totlen; hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); if (hdr_crc != je32_to_cpu(node->hdr_crc)) { noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n", ofs, je16_to_cpu(node->magic), je16_to_cpu(node->nodetype), je32_to_cpu(node->totlen), je32_to_cpu(node->hdr_crc), hdr_crc); DIRTY_SPACE(4); ofs += 4; continue; } if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) { /* Eep. Node goes over the end of the erase block. */ printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", ofs, je32_to_cpu(node->totlen)); printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n"); DIRTY_SPACE(4); ofs += 4; continue; } if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { /* Wheee. This is an obsoleted node */ D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs)); DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); ofs += PAD(je32_to_cpu(node->totlen)); continue; } switch(je16_to_cpu(node->nodetype)) { case JFFS2_NODETYPE_INODE: if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", sizeof(struct jffs2_raw_inode), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_NODETYPE_DIRENT: if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", je32_to_cpu(node->totlen), buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) return err; buf_ofs = ofs; node = (void *)buf; } err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs); if (err) return err; ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_NODETYPE_CLEANMARKER: D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs)); if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node))); ofs += PAD(sizeof(struct jffs2_unknown_node)); } else if (jeb->first_node) { printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node))); ofs += PAD(sizeof(struct jffs2_unknown_node)); } else { struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref(); if (!marker_ref) { printk(KERN_NOTICE "Failed to allocate node ref for clean marker\n"); return -ENOMEM; } marker_ref->next_in_ino = NULL; marker_ref->next_phys = NULL; marker_ref->flash_offset = ofs | REF_NORMAL; marker_ref->__totlen = c->cleanmarker_size; jeb->first_node = jeb->last_node = marker_ref; USED_SPACE(PAD(c->cleanmarker_size)); ofs += PAD(c->cleanmarker_size); } break; case JFFS2_NODETYPE_PADDING: DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); ofs += PAD(je32_to_cpu(node->totlen)); break; default: switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { case JFFS2_FEATURE_ROCOMPAT: printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); c->flags |= JFFS2_SB_FLAG_RO; if (!(jffs2_is_readonly(c))) return -EROFS; DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_FEATURE_INCOMPAT: printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); return -EINVAL; case JFFS2_FEATURE_RWCOMPAT_DELETE: D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); ofs += PAD(je32_to_cpu(node->totlen)); break; case JFFS2_FEATURE_RWCOMPAT_COPY: D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); USED_SPACE(PAD(je32_to_cpu(node->totlen))); ofs += PAD(je32_to_cpu(node->totlen)); break; } } } D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x\n", jeb->offset, jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size)); /* mark_node_obsolete can add to wasted !! */ if (jeb->wasted_size) { jeb->dirty_size += jeb->wasted_size; c->dirty_size += jeb->wasted_size; c->wasted_size -= jeb->wasted_size; jeb->wasted_size = 0; } if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size && (!jeb->first_node || !jeb->first_node->next_phys) ) return BLK_STATE_CLEANMARKER; /* move blocks with max 4 byte dirty space to cleanlist */ else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { c->dirty_size -= jeb->dirty_size; c->wasted_size += jeb->dirty_size; jeb->wasted_size += jeb->dirty_size; jeb->dirty_size = 0; return BLK_STATE_CLEAN; } else if (jeb->used_size || jeb->unchecked_size) return BLK_STATE_PARTDIRTY; else return BLK_STATE_ALLDIRTY; }