/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright (C) 2001-2003 Red Hat, Inc. * * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * * $Id: scan.c,v 1.119 2005/02/17 17:51:13 dedekind 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 "nodelist.h" #define DEFAULT_EMPTY_SCAN_SIZE 1024 #define DIRTY_SPACE(x) do { typeof(x) _x = (x); \ c->free_size -= _x; c->dirty_size += _x; \ jeb->free_size -= _x ; jeb->dirty_size += _x; \ }while(0) #define USED_SPACE(x) do { typeof(x) _x = (x); \ c->free_size -= _x; c->used_size += _x; \ jeb->free_size -= _x ; jeb->used_size += _x; \ }while(0) #define UNCHECKED_SPACE(x) do { typeof(x) _x = (x); \ c->free_size -= _x; c->unchecked_size += _x; \ jeb->free_size -= _x ; jeb->unchecked_size += _x; \ }while(0) #define noisy_printk(noise, args...) do { \ if (*(noise)) { \ printk(KERN_NOTICE args); \ (*(noise))--; \ if (!(*(noise))) { \ printk(KERN_NOTICE "Further such events for this erase block will not be printed\n"); \ } \ } \ } while(0) static uint32_t pseudo_random; static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, unsigned char *buf, uint32_t buf_size); /* These helper functions _must_ increase ofs and also do the dirty/used space accounting. * Returning an error will abort the mount - bad checksums etc. should just mark the space * as dirty. */ static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_inode *ri, uint32_t ofs); static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_dirent *rd, uint32_t ofs); #define BLK_STATE_ALLFF 0 #define BLK_STATE_CLEAN 1 #define BLK_STATE_PARTDIRTY 2 #define BLK_STATE_CLEANMARKER 3 #define BLK_STATE_ALLDIRTY 4 #define BLK_STATE_BADBLOCK 5 static inline int min_free(struct jffs2_sb_info *c) { uint32_t min = 2 * sizeof(struct jffs2_raw_inode); #ifdef CONFIG_JFFS2_FS_WRITEBUFFER if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize) return c->wbuf_pagesize; #endif return min; } static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) { if (sector_size < DEFAULT_EMPTY_SCAN_SIZE) return sector_size; else return DEFAULT_EMPTY_SCAN_SIZE; } 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; #ifndef __ECOS size_t pointlen; if (c->mtd->point) { ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf); 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, flashbuf, 0, c->mtd->size); 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 (jffs2_cleanmarker_oob(c)) 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; } for (i=0; i<c->nr_blocks; i++) { struct jffs2_eraseblock *jeb = &c->blocks[i]; ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), buf_size); if (ret < 0) goto out; ACCT_PARANOIA_CHECK(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) { c->nextblock->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size; c->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size; c->free_size -= c->nextblock->free_size; c->wasted_size -= c->nextblock->wasted_size; c->nextblock->free_size = c->nextblock->wasted_size = 0; if (VERYDIRTY(c, c->nextblock->dirty_size)) { list_add(&c->nextblock->list, &c->very_dirty_list); } else { list_add(&c->nextblock->list, &c->dirty_list); } } c->nextblock = jeb; } else { jeb->dirty_size += jeb->free_size + jeb->wasted_size; c->dirty_size += jeb->free_size + jeb->wasted_size; c->free_size -= jeb->free_size; c->wasted_size -= jeb->wasted_size; jeb->free_size = jeb->wasted_size = 0; if (VERYDIRTY(c, jeb->dirty_size)) { list_add(&jeb->list, &c->very_dirty_list); } else { list_add(&jeb->list, &c->dirty_list); } } 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->nextblock && (c->nextblock->free_size & (c->wbuf_pagesize-1))) { /* 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-1); D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n", skip)); c->nextblock->wasted_size += skip; c->wasted_size += skip; c->nextblock->free_size -= skip; c->free_size -= 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; } jffs2_erase_pending_trigger(c); } ret = 0; out: if (buf_size) kfree(flashbuf); #ifndef __ECOS else c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); #endif return ret; } static int jffs2_fill_scan_buf (struct jffs2_sb_info *c, unsigned char *buf, uint32_t ofs, uint32_t len) { int ret; size_t retlen; ret = jffs2_flash_read(c, ofs, len, &retlen, buf); if (ret) { D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret)); return ret; } if (retlen < len) { D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen)); return -EIO; } D2(printk(KERN_DEBUG "Read 0x%x bytes from 0x%08x into buf\n", len, ofs)); D2(printk(KERN_DEBUG "000: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15])); return 0; } 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) { D1(ACCT_PARANOIA_CHECK(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; } static struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) { struct jffs2_inode_cache *ic; ic = jffs2_get_ino_cache(c, ino); if (ic) return ic; if (ino > c->highest_ino) c->highest_ino = ino; ic = jffs2_alloc_inode_cache(); if (!ic) { printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n"); return NULL; } memset(ic, 0, sizeof(*ic)); ic->ino = ino; ic->nodes = (void *)ic; jffs2_add_ino_cache(c, ic); if (ino == 1) ic->nlink = 1; return ic; } static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_inode *ri, uint32_t ofs) { struct jffs2_raw_node_ref *raw; struct jffs2_inode_cache *ic; uint32_t ino = je32_to_cpu(ri->ino); D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); /* We do very little here now. Just check the ino# to which we should attribute this node; we can do all the CRC checking etc. later. There's a tradeoff here -- we used to scan the flash once only, reading everything we want from it into memory, then building all our in-core data structures and freeing the extra information. Now we allow the first part of the mount to complete a lot quicker, but we have to go _back_ to the flash in order to finish the CRC checking, etc. Which means that the _full_ amount of time to get to proper write mode with GC operational may actually be _longer_ than before. Sucks to be me. */ raw = jffs2_alloc_raw_node_ref(); if (!raw) { printk(KERN_NOTICE "jffs2_scan_inode_node(): allocation of node reference failed\n"); return -ENOMEM; } ic = jffs2_get_ino_cache(c, ino); if (!ic) { /* Inocache get failed. Either we read a bogus ino# or it's just genuinely the first node we found for this inode. Do a CRC check to protect against the former case */ uint32_t crc = crc32(0, ri, sizeof(*ri)-8); if (crc != je32_to_cpu(ri->node_crc)) { printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", ofs, je32_to_cpu(ri->node_crc), crc); /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ DIRTY_SPACE(PAD(je32_to_cpu(ri->totlen))); jffs2_free_raw_node_ref(raw); return 0; } ic = jffs2_scan_make_ino_cache(c, ino); if (!ic) { jffs2_free_raw_node_ref(raw); return -ENOMEM; } } /* Wheee. It worked */ raw->flash_offset = ofs | REF_UNCHECKED; raw->__totlen = PAD(je32_to_cpu(ri->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; D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n", je32_to_cpu(ri->ino), je32_to_cpu(ri->version), je32_to_cpu(ri->offset), je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize))); pseudo_random += je32_to_cpu(ri->version); UNCHECKED_SPACE(PAD(je32_to_cpu(ri->totlen))); return 0; } static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_dirent *rd, uint32_t ofs) { struct jffs2_raw_node_ref *raw; struct jffs2_full_dirent *fd; struct jffs2_inode_cache *ic; uint32_t crc; D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs)); /* We don't get here unless the node is still valid, so we don't have to mask in the ACCURATE bit any more. */ crc = crc32(0, rd, sizeof(*rd)-8); if (crc != je32_to_cpu(rd->node_crc)) { printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", ofs, je32_to_cpu(rd->node_crc), crc); /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ DIRTY_SPACE(PAD(je32_to_cpu(rd->totlen))); return 0; } pseudo_random += je32_to_cpu(rd->version); fd = jffs2_alloc_full_dirent(rd->nsize+1); if (!fd) { return -ENOMEM; } memcpy(&fd->name, rd->name, rd->nsize); fd->name[rd->nsize] = 0; crc = crc32(0, fd->name, rd->nsize); if (crc != je32_to_cpu(rd->name_crc)) { printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", ofs, je32_to_cpu(rd->name_crc), crc); D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino))); jffs2_free_full_dirent(fd); /* FIXME: Why do we believe totlen? */ /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ DIRTY_SPACE(PAD(je32_to_cpu(rd->totlen))); return 0; } raw = jffs2_alloc_raw_node_ref(); if (!raw) { jffs2_free_full_dirent(fd); printk(KERN_NOTICE "jffs2_scan_dirent_node(): allocation of node reference failed\n"); return -ENOMEM; } ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); if (!ic) { jffs2_free_full_dirent(fd); jffs2_free_raw_node_ref(raw); return -ENOMEM; } raw->__totlen = PAD(je32_to_cpu(rd->totlen)); raw->flash_offset = ofs | 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(rd->version); fd->ino = je32_to_cpu(rd->ino); fd->nhash = full_name_hash(fd->name, rd->nsize); fd->type = rd->type; USED_SPACE(PAD(je32_to_cpu(rd->totlen))); jffs2_add_fd_to_list(c, fd, &ic->scan_dents); return 0; } static int count_list(struct list_head *l) { uint32_t count = 0; struct list_head *tmp; list_for_each(tmp, l) { count++; } return count; } /* Note: This breaks if list_empty(head). I don't care. You might, if you copy this code and use it elsewhere :) */ static void rotate_list(struct list_head *head, uint32_t count) { struct list_head *n = head->next; list_del(head); while(count--) { n = n->next; } list_add(head, n); } void jffs2_rotate_lists(struct jffs2_sb_info *c) { uint32_t x; uint32_t rotateby; x = count_list(&c->clean_list); if (x) { rotateby = pseudo_random % x; D1(printk(KERN_DEBUG "Rotating clean_list by %d\n", rotateby)); rotate_list((&c->clean_list), rotateby); D1(printk(KERN_DEBUG "Erase block at front of clean_list is at %08x\n", list_entry(c->clean_list.next, struct jffs2_eraseblock, list)->offset)); } else { D1(printk(KERN_DEBUG "Not rotating empty clean_list\n")); } x = count_list(&c->very_dirty_list); if (x) { rotateby = pseudo_random % x; D1(printk(KERN_DEBUG "Rotating very_dirty_list by %d\n", rotateby)); rotate_list((&c->very_dirty_list), rotateby); D1(printk(KERN_DEBUG "Erase block at front of very_dirty_list is at %08x\n", list_entry(c->very_dirty_list.next, struct jffs2_eraseblock, list)->offset)); } else { D1(printk(KERN_DEBUG "Not rotating empty very_dirty_list\n")); } x = count_list(&c->dirty_list); if (x) { rotateby = pseudo_random % x; D1(printk(KERN_DEBUG "Rotating dirty_list by %d\n", rotateby)); rotate_list((&c->dirty_list), rotateby); D1(printk(KERN_DEBUG "Erase block at front of dirty_list is at %08x\n", list_entry(c->dirty_list.next, struct jffs2_eraseblock, list)->offset)); } else { D1(printk(KERN_DEBUG "Not rotating empty dirty_list\n")); } x = count_list(&c->erasable_list); if (x) { rotateby = pseudo_random % x; D1(printk(KERN_DEBUG "Rotating erasable_list by %d\n", rotateby)); rotate_list((&c->erasable_list), rotateby); D1(printk(KERN_DEBUG "Erase block at front of erasable_list is at %08x\n", list_entry(c->erasable_list.next, struct jffs2_eraseblock, list)->offset)); } else { D1(printk(KERN_DEBUG "Not rotating empty erasable_list\n")); } if (c->nr_erasing_blocks) { rotateby = pseudo_random % c->nr_erasing_blocks; D1(printk(KERN_DEBUG "Rotating erase_pending_list by %d\n", rotateby)); rotate_list((&c->erase_pending_list), rotateby); D1(printk(KERN_DEBUG "Erase block at front of erase_pending_list is at %08x\n", list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list)->offset)); } else { D1(printk(KERN_DEBUG "Not rotating empty erase_pending_list\n")); } if (c->nr_free_blocks) { rotateby = pseudo_random % c->nr_free_blocks; D1(printk(KERN_DEBUG "Rotating free_list by %d\n", rotateby)); rotate_list((&c->free_list), rotateby); D1(printk(KERN_DEBUG "Erase block at front of free_list is at %08x\n", list_entry(c->free_list.next, struct jffs2_eraseblock, list)->offset)); } else { D1(printk(KERN_DEBUG "Not rotating empty free_list\n")); } }