11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001-2003 Red Hat, Inc. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Created by David Woodhouse <dwmw2@infradead.org> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * For licensing information, see the file 'LICENCE' in this directory. 91da177e4SLinus Torvalds * 10daba5cc4SArtem B. Bityutskiy * $Id: scan.c,v 1.125 2005/09/30 13:59:13 dedekind Exp $ 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds #include <linux/kernel.h> 141da177e4SLinus Torvalds #include <linux/sched.h> 151da177e4SLinus Torvalds #include <linux/slab.h> 161da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 171da177e4SLinus Torvalds #include <linux/pagemap.h> 181da177e4SLinus Torvalds #include <linux/crc32.h> 191da177e4SLinus Torvalds #include <linux/compiler.h> 201da177e4SLinus Torvalds #include "nodelist.h" 21e631ddbaSFerenc Havasi #include "summary.h" 22e631ddbaSFerenc Havasi #include "debug.h" 231da177e4SLinus Torvalds 243be36675SAndrew Victor #define DEFAULT_EMPTY_SCAN_SIZE 1024 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #define noisy_printk(noise, args...) do { \ 271da177e4SLinus Torvalds if (*(noise)) { \ 281da177e4SLinus Torvalds printk(KERN_NOTICE args); \ 291da177e4SLinus Torvalds (*(noise))--; \ 301da177e4SLinus Torvalds if (!(*(noise))) { \ 311da177e4SLinus Torvalds printk(KERN_NOTICE "Further such events for this erase block will not be printed\n"); \ 321da177e4SLinus Torvalds } \ 331da177e4SLinus Torvalds } \ 341da177e4SLinus Torvalds } while(0) 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds static uint32_t pseudo_random; 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 39e631ddbaSFerenc Havasi unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s); 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds /* These helper functions _must_ increase ofs and also do the dirty/used space accounting. 421da177e4SLinus Torvalds * Returning an error will abort the mount - bad checksums etc. should just mark the space 431da177e4SLinus Torvalds * as dirty. 441da177e4SLinus Torvalds */ 451da177e4SLinus Torvalds static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 46e631ddbaSFerenc Havasi struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s); 471da177e4SLinus Torvalds static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 48e631ddbaSFerenc Havasi struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s); 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds static inline int min_free(struct jffs2_sb_info *c) 511da177e4SLinus Torvalds { 521da177e4SLinus Torvalds uint32_t min = 2 * sizeof(struct jffs2_raw_inode); 532f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 541da177e4SLinus Torvalds if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize) 551da177e4SLinus Torvalds return c->wbuf_pagesize; 561da177e4SLinus Torvalds #endif 571da177e4SLinus Torvalds return min; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds } 603be36675SAndrew Victor 613be36675SAndrew Victor static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) { 623be36675SAndrew Victor if (sector_size < DEFAULT_EMPTY_SCAN_SIZE) 633be36675SAndrew Victor return sector_size; 643be36675SAndrew Victor else 653be36675SAndrew Victor return DEFAULT_EMPTY_SCAN_SIZE; 663be36675SAndrew Victor } 673be36675SAndrew Victor 681da177e4SLinus Torvalds int jffs2_scan_medium(struct jffs2_sb_info *c) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds int i, ret; 711da177e4SLinus Torvalds uint32_t empty_blocks = 0, bad_blocks = 0; 721da177e4SLinus Torvalds unsigned char *flashbuf = NULL; 731da177e4SLinus Torvalds uint32_t buf_size = 0; 74e631ddbaSFerenc Havasi struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ 751da177e4SLinus Torvalds #ifndef __ECOS 761da177e4SLinus Torvalds size_t pointlen; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds if (c->mtd->point) { 791da177e4SLinus Torvalds ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf); 801da177e4SLinus Torvalds if (!ret && pointlen < c->mtd->size) { 811da177e4SLinus Torvalds /* Don't muck about if it won't let us point to the whole flash */ 821da177e4SLinus Torvalds D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen)); 831da177e4SLinus Torvalds c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); 841da177e4SLinus Torvalds flashbuf = NULL; 851da177e4SLinus Torvalds } 861da177e4SLinus Torvalds if (ret) 871da177e4SLinus Torvalds D1(printk(KERN_DEBUG "MTD point failed %d\n", ret)); 881da177e4SLinus Torvalds } 891da177e4SLinus Torvalds #endif 901da177e4SLinus Torvalds if (!flashbuf) { 911da177e4SLinus Torvalds /* For NAND it's quicker to read a whole eraseblock at a time, 921da177e4SLinus Torvalds apparently */ 931da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 941da177e4SLinus Torvalds buf_size = c->sector_size; 951da177e4SLinus Torvalds else 961da177e4SLinus Torvalds buf_size = PAGE_SIZE; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* Respect kmalloc limitations */ 991da177e4SLinus Torvalds if (buf_size > 128*1024) 1001da177e4SLinus Torvalds buf_size = 128*1024; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size)); 1031da177e4SLinus Torvalds flashbuf = kmalloc(buf_size, GFP_KERNEL); 1041da177e4SLinus Torvalds if (!flashbuf) 1051da177e4SLinus Torvalds return -ENOMEM; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 108e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 109e631ddbaSFerenc Havasi s = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 110e631ddbaSFerenc Havasi if (!s) { 111e631ddbaSFerenc Havasi JFFS2_WARNING("Can't allocate memory for summary\n"); 112e631ddbaSFerenc Havasi return -ENOMEM; 113e631ddbaSFerenc Havasi } 114e631ddbaSFerenc Havasi memset(s, 0, sizeof(struct jffs2_summary)); 115e631ddbaSFerenc Havasi } 116e631ddbaSFerenc Havasi 1171da177e4SLinus Torvalds for (i=0; i<c->nr_blocks; i++) { 1181da177e4SLinus Torvalds struct jffs2_eraseblock *jeb = &c->blocks[i]; 1191da177e4SLinus Torvalds 120e631ddbaSFerenc Havasi /* reset summary info for next eraseblock scan */ 121e631ddbaSFerenc Havasi jffs2_sum_reset_collected(s); 122e631ddbaSFerenc Havasi 123e631ddbaSFerenc Havasi ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), 124e631ddbaSFerenc Havasi buf_size, s); 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds if (ret < 0) 1271da177e4SLinus Torvalds goto out; 1281da177e4SLinus Torvalds 129e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds /* Now decide which list to put it on */ 1321da177e4SLinus Torvalds switch(ret) { 1331da177e4SLinus Torvalds case BLK_STATE_ALLFF: 1341da177e4SLinus Torvalds /* 1351da177e4SLinus Torvalds * Empty block. Since we can't be sure it 1361da177e4SLinus Torvalds * was entirely erased, we just queue it for erase 1371da177e4SLinus Torvalds * again. It will be marked as such when the erase 1381da177e4SLinus Torvalds * is complete. Meanwhile we still count it as empty 1391da177e4SLinus Torvalds * for later checks. 1401da177e4SLinus Torvalds */ 1411da177e4SLinus Torvalds empty_blocks++; 1421da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1431da177e4SLinus Torvalds c->nr_erasing_blocks++; 1441da177e4SLinus Torvalds break; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds case BLK_STATE_CLEANMARKER: 1471da177e4SLinus Torvalds /* Only a CLEANMARKER node is valid */ 1481da177e4SLinus Torvalds if (!jeb->dirty_size) { 1491da177e4SLinus Torvalds /* It's actually free */ 1501da177e4SLinus Torvalds list_add(&jeb->list, &c->free_list); 1511da177e4SLinus Torvalds c->nr_free_blocks++; 1521da177e4SLinus Torvalds } else { 1531da177e4SLinus Torvalds /* Dirt */ 1541da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset)); 1551da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1561da177e4SLinus Torvalds c->nr_erasing_blocks++; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds break; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds case BLK_STATE_CLEAN: 1611da177e4SLinus Torvalds /* Full (or almost full) of clean data. Clean list */ 1621da177e4SLinus Torvalds list_add(&jeb->list, &c->clean_list); 1631da177e4SLinus Torvalds break; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds case BLK_STATE_PARTDIRTY: 1661da177e4SLinus Torvalds /* Some data, but not full. Dirty list. */ 1671da177e4SLinus Torvalds /* We want to remember the block with most free space 1681da177e4SLinus Torvalds and stick it in the 'nextblock' position to start writing to it. */ 1691da177e4SLinus Torvalds if (jeb->free_size > min_free(c) && 1701da177e4SLinus Torvalds (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { 1711da177e4SLinus Torvalds /* Better candidate for the next writes to go to */ 1721da177e4SLinus Torvalds if (c->nextblock) { 1731da177e4SLinus Torvalds c->nextblock->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size; 1741da177e4SLinus Torvalds c->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size; 1751da177e4SLinus Torvalds c->free_size -= c->nextblock->free_size; 1761da177e4SLinus Torvalds c->wasted_size -= c->nextblock->wasted_size; 1771da177e4SLinus Torvalds c->nextblock->free_size = c->nextblock->wasted_size = 0; 1781da177e4SLinus Torvalds if (VERYDIRTY(c, c->nextblock->dirty_size)) { 1791da177e4SLinus Torvalds list_add(&c->nextblock->list, &c->very_dirty_list); 1801da177e4SLinus Torvalds } else { 1811da177e4SLinus Torvalds list_add(&c->nextblock->list, &c->dirty_list); 1821da177e4SLinus Torvalds } 183e631ddbaSFerenc Havasi /* deleting summary information of the old nextblock */ 184e631ddbaSFerenc Havasi jffs2_sum_reset_collected(c->summary); 1851da177e4SLinus Torvalds } 186e631ddbaSFerenc Havasi /* update collected summary infromation for the current nextblock */ 187e631ddbaSFerenc Havasi jffs2_sum_move_collected(c, s); 188e631ddbaSFerenc Havasi D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset)); 1891da177e4SLinus Torvalds c->nextblock = jeb; 1901da177e4SLinus Torvalds } else { 1911da177e4SLinus Torvalds jeb->dirty_size += jeb->free_size + jeb->wasted_size; 1921da177e4SLinus Torvalds c->dirty_size += jeb->free_size + jeb->wasted_size; 1931da177e4SLinus Torvalds c->free_size -= jeb->free_size; 1941da177e4SLinus Torvalds c->wasted_size -= jeb->wasted_size; 1951da177e4SLinus Torvalds jeb->free_size = jeb->wasted_size = 0; 1961da177e4SLinus Torvalds if (VERYDIRTY(c, jeb->dirty_size)) { 1971da177e4SLinus Torvalds list_add(&jeb->list, &c->very_dirty_list); 1981da177e4SLinus Torvalds } else { 1991da177e4SLinus Torvalds list_add(&jeb->list, &c->dirty_list); 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds break; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds case BLK_STATE_ALLDIRTY: 2051da177e4SLinus Torvalds /* Nothing valid - not even a clean marker. Needs erasing. */ 2061da177e4SLinus Torvalds /* For now we just put it on the erasing list. We'll start the erases later */ 2071da177e4SLinus Torvalds D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset)); 2081da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 2091da177e4SLinus Torvalds c->nr_erasing_blocks++; 2101da177e4SLinus Torvalds break; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds case BLK_STATE_BADBLOCK: 2131da177e4SLinus Torvalds D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset)); 2141da177e4SLinus Torvalds list_add(&jeb->list, &c->bad_list); 2151da177e4SLinus Torvalds c->bad_size += c->sector_size; 2161da177e4SLinus Torvalds c->free_size -= c->sector_size; 2171da177e4SLinus Torvalds bad_blocks++; 2181da177e4SLinus Torvalds break; 2191da177e4SLinus Torvalds default: 2201da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n"); 2211da177e4SLinus Torvalds BUG(); 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */ 2261da177e4SLinus Torvalds if (c->nextblock && (c->nextblock->dirty_size)) { 2271da177e4SLinus Torvalds c->nextblock->wasted_size += c->nextblock->dirty_size; 2281da177e4SLinus Torvalds c->wasted_size += c->nextblock->dirty_size; 2291da177e4SLinus Torvalds c->dirty_size -= c->nextblock->dirty_size; 2301da177e4SLinus Torvalds c->nextblock->dirty_size = 0; 2311da177e4SLinus Torvalds } 2322f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 233e96fb230SDavid Woodhouse if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { 2341da177e4SLinus Torvalds /* If we're going to start writing into a block which already 2351da177e4SLinus Torvalds contains data, and the end of the data isn't page-aligned, 2361da177e4SLinus Torvalds skip a little and align it. */ 2371da177e4SLinus Torvalds 238daba5cc4SArtem B. Bityutskiy uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n", 2411da177e4SLinus Torvalds skip)); 2421da177e4SLinus Torvalds c->nextblock->wasted_size += skip; 2431da177e4SLinus Torvalds c->wasted_size += skip; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds c->nextblock->free_size -= skip; 2461da177e4SLinus Torvalds c->free_size -= skip; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds #endif 2491da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 2501da177e4SLinus Torvalds if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { 2511da177e4SLinus Torvalds printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); 2521da177e4SLinus Torvalds printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks); 2531da177e4SLinus Torvalds ret = -EIO; 2541da177e4SLinus Torvalds goto out; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds ret = 0; 2591da177e4SLinus Torvalds out: 2601da177e4SLinus Torvalds if (buf_size) 2611da177e4SLinus Torvalds kfree(flashbuf); 2621da177e4SLinus Torvalds #ifndef __ECOS 2631da177e4SLinus Torvalds else 2641da177e4SLinus Torvalds c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); 2651da177e4SLinus Torvalds #endif 2665b5ffbc1SFlorin Malita if (s) 2675b5ffbc1SFlorin Malita kfree(s); 2685b5ffbc1SFlorin Malita 2691da177e4SLinus Torvalds return ret; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 272e631ddbaSFerenc Havasi int jffs2_fill_scan_buf (struct jffs2_sb_info *c, void *buf, 2731da177e4SLinus Torvalds uint32_t ofs, uint32_t len) 2741da177e4SLinus Torvalds { 2751da177e4SLinus Torvalds int ret; 2761da177e4SLinus Torvalds size_t retlen; 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds ret = jffs2_flash_read(c, ofs, len, &retlen, buf); 2791da177e4SLinus Torvalds if (ret) { 2801da177e4SLinus Torvalds D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret)); 2811da177e4SLinus Torvalds return ret; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds if (retlen < len) { 2841da177e4SLinus Torvalds D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen)); 2851da177e4SLinus Torvalds return -EIO; 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds return 0; 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds 290e631ddbaSFerenc Havasi int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 291e631ddbaSFerenc Havasi { 292e631ddbaSFerenc Havasi if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size 293e631ddbaSFerenc Havasi && (!jeb->first_node || !jeb->first_node->next_phys) ) 294e631ddbaSFerenc Havasi return BLK_STATE_CLEANMARKER; 295e631ddbaSFerenc Havasi 296e631ddbaSFerenc Havasi /* move blocks with max 4 byte dirty space to cleanlist */ 297e631ddbaSFerenc Havasi else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { 298e631ddbaSFerenc Havasi c->dirty_size -= jeb->dirty_size; 299e631ddbaSFerenc Havasi c->wasted_size += jeb->dirty_size; 300e631ddbaSFerenc Havasi jeb->wasted_size += jeb->dirty_size; 301e631ddbaSFerenc Havasi jeb->dirty_size = 0; 302e631ddbaSFerenc Havasi return BLK_STATE_CLEAN; 303e631ddbaSFerenc Havasi } else if (jeb->used_size || jeb->unchecked_size) 304e631ddbaSFerenc Havasi return BLK_STATE_PARTDIRTY; 305e631ddbaSFerenc Havasi else 306e631ddbaSFerenc Havasi return BLK_STATE_ALLDIRTY; 307e631ddbaSFerenc Havasi } 308e631ddbaSFerenc Havasi 309aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 310aa98d7cfSKaiGai Kohei static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 311aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr *rx, uint32_t ofs, 312aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 313aa98d7cfSKaiGai Kohei { 314aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 315aa98d7cfSKaiGai Kohei struct jffs2_raw_node_ref *raw; 316aa98d7cfSKaiGai Kohei uint32_t totlen, crc; 317aa98d7cfSKaiGai Kohei 318aa98d7cfSKaiGai Kohei crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); 319aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx->node_crc)) { 320aa98d7cfSKaiGai Kohei if (je32_to_cpu(rx->node_crc) != 0xffffffff) 321aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 322aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->node_crc), crc); 323aa98d7cfSKaiGai Kohei DIRTY_SPACE(je32_to_cpu(rx->totlen)); 324aa98d7cfSKaiGai Kohei return 0; 325aa98d7cfSKaiGai Kohei } 326aa98d7cfSKaiGai Kohei 327aa98d7cfSKaiGai Kohei totlen = PAD(sizeof(*rx) + rx->name_len + 1 + je16_to_cpu(rx->value_len)); 328aa98d7cfSKaiGai Kohei if (totlen != je32_to_cpu(rx->totlen)) { 329aa98d7cfSKaiGai Kohei JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", 330aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->totlen), totlen); 331aa98d7cfSKaiGai Kohei DIRTY_SPACE(je32_to_cpu(rx->totlen)); 332aa98d7cfSKaiGai Kohei return 0; 333aa98d7cfSKaiGai Kohei } 334aa98d7cfSKaiGai Kohei 335aa98d7cfSKaiGai Kohei raw = jffs2_alloc_raw_node_ref(); 336aa98d7cfSKaiGai Kohei if (!raw) 337aa98d7cfSKaiGai Kohei return -ENOMEM; 338aa98d7cfSKaiGai Kohei 339aa98d7cfSKaiGai Kohei xd = jffs2_setup_xattr_datum(c, je32_to_cpu(rx->xid), je32_to_cpu(rx->version)); 340aa98d7cfSKaiGai Kohei if (IS_ERR(xd)) { 341aa98d7cfSKaiGai Kohei jffs2_free_raw_node_ref(raw); 342aa98d7cfSKaiGai Kohei if (PTR_ERR(xd) == -EEXIST) { 343aa98d7cfSKaiGai Kohei DIRTY_SPACE(PAD(je32_to_cpu(rx->totlen))); 344aa98d7cfSKaiGai Kohei return 0; 345aa98d7cfSKaiGai Kohei } 346aa98d7cfSKaiGai Kohei return PTR_ERR(xd); 347aa98d7cfSKaiGai Kohei } 348aa98d7cfSKaiGai Kohei xd->xprefix = rx->xprefix; 349aa98d7cfSKaiGai Kohei xd->name_len = rx->name_len; 350aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx->value_len); 351aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx->data_crc); 352aa98d7cfSKaiGai Kohei xd->node = raw; 353aa98d7cfSKaiGai Kohei 354aa98d7cfSKaiGai Kohei raw->flash_offset = ofs | REF_PRISTINE; 355aa98d7cfSKaiGai Kohei raw->next_in_ino = (void *)xd; 356aa98d7cfSKaiGai Kohei 357f1f9671bSDavid Woodhouse jffs2_link_node_ref(c, jeb, raw, totlen); 358f1f9671bSDavid Woodhouse 359aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 360aa98d7cfSKaiGai Kohei jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset); 361aa98d7cfSKaiGai Kohei dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n", 362aa98d7cfSKaiGai Kohei ofs, xd->xid, xd->version); 363aa98d7cfSKaiGai Kohei return 0; 364aa98d7cfSKaiGai Kohei } 365aa98d7cfSKaiGai Kohei 366aa98d7cfSKaiGai Kohei static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 367aa98d7cfSKaiGai Kohei struct jffs2_raw_xref *rr, uint32_t ofs, 368aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 369aa98d7cfSKaiGai Kohei { 370aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 371aa98d7cfSKaiGai Kohei struct jffs2_raw_node_ref *raw; 372aa98d7cfSKaiGai Kohei uint32_t crc; 373aa98d7cfSKaiGai Kohei 374aa98d7cfSKaiGai Kohei crc = crc32(0, rr, sizeof(*rr) - 4); 375aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr->node_crc)) { 376aa98d7cfSKaiGai Kohei if (je32_to_cpu(rr->node_crc) != 0xffffffff) 377aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 378aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->node_crc), crc); 379aa98d7cfSKaiGai Kohei DIRTY_SPACE(PAD(je32_to_cpu(rr->totlen))); 380aa98d7cfSKaiGai Kohei return 0; 381aa98d7cfSKaiGai Kohei } 382aa98d7cfSKaiGai Kohei 383aa98d7cfSKaiGai Kohei if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { 384aa98d7cfSKaiGai Kohei JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", 385aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->totlen), 386aa98d7cfSKaiGai Kohei PAD(sizeof(struct jffs2_raw_xref))); 387aa98d7cfSKaiGai Kohei DIRTY_SPACE(je32_to_cpu(rr->totlen)); 388aa98d7cfSKaiGai Kohei return 0; 389aa98d7cfSKaiGai Kohei } 390aa98d7cfSKaiGai Kohei 391aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 392aa98d7cfSKaiGai Kohei if (!ref) 393aa98d7cfSKaiGai Kohei return -ENOMEM; 394aa98d7cfSKaiGai Kohei 395aa98d7cfSKaiGai Kohei raw = jffs2_alloc_raw_node_ref(); 396aa98d7cfSKaiGai Kohei if (!raw) { 397aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 398aa98d7cfSKaiGai Kohei return -ENOMEM; 399aa98d7cfSKaiGai Kohei } 400aa98d7cfSKaiGai Kohei 401aa98d7cfSKaiGai Kohei /* BEFORE jffs2_build_xattr_subsystem() called, 402aa98d7cfSKaiGai Kohei * ref->xid is used to store 32bit xid, xd is not used 403aa98d7cfSKaiGai Kohei * ref->ino is used to store 32bit inode-number, ic is not used 404aa98d7cfSKaiGai Kohei * Thoes variables are declared as union, thus using those 4058f2b6f49SKaiGai Kohei * are exclusive. In a similar way, ref->next is temporarily 406aa98d7cfSKaiGai Kohei * used to chain all xattr_ref object. It's re-chained to 407aa98d7cfSKaiGai Kohei * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. 408aa98d7cfSKaiGai Kohei */ 409aa98d7cfSKaiGai Kohei ref->node = raw; 410aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr->ino); 411aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr->xid); 4128f2b6f49SKaiGai Kohei ref->next = c->xref_temp; 4138f2b6f49SKaiGai Kohei c->xref_temp = ref; 414aa98d7cfSKaiGai Kohei 415aa98d7cfSKaiGai Kohei raw->flash_offset = ofs | REF_PRISTINE; 416aa98d7cfSKaiGai Kohei raw->next_in_ino = (void *)ref; 417aa98d7cfSKaiGai Kohei 418f1f9671bSDavid Woodhouse jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(rr->totlen))); 419f1f9671bSDavid Woodhouse 420aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 421aa98d7cfSKaiGai Kohei jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); 422aa98d7cfSKaiGai Kohei dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", 423aa98d7cfSKaiGai Kohei ofs, ref->xid, ref->ino); 424aa98d7cfSKaiGai Kohei return 0; 425aa98d7cfSKaiGai Kohei } 426aa98d7cfSKaiGai Kohei #endif 427aa98d7cfSKaiGai Kohei 4289641b784SDavid Woodhouse /* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into 4299641b784SDavid Woodhouse the flash, XIP-style */ 4301da177e4SLinus Torvalds static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 431e631ddbaSFerenc Havasi unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { 4321da177e4SLinus Torvalds struct jffs2_unknown_node *node; 4331da177e4SLinus Torvalds struct jffs2_unknown_node crcnode; 4341da177e4SLinus Torvalds uint32_t ofs, prevofs; 4351da177e4SLinus Torvalds uint32_t hdr_crc, buf_ofs, buf_len; 4361da177e4SLinus Torvalds int err; 4371da177e4SLinus Torvalds int noise = 0; 438e631ddbaSFerenc Havasi 439e631ddbaSFerenc Havasi 4402f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4411da177e4SLinus Torvalds int cleanmarkerfound = 0; 4421da177e4SLinus Torvalds #endif 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds ofs = jeb->offset; 4451da177e4SLinus Torvalds prevofs = jeb->offset - 1; 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs)); 4481da177e4SLinus Torvalds 4492f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4501da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 4511da177e4SLinus Torvalds int ret = jffs2_check_nand_cleanmarker(c, jeb); 4521da177e4SLinus Torvalds D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret)); 4531da177e4SLinus Torvalds /* Even if it's not found, we still scan to see 4541da177e4SLinus Torvalds if the block is empty. We use this information 4551da177e4SLinus Torvalds to decide whether to erase it or not. */ 4561da177e4SLinus Torvalds switch (ret) { 4571da177e4SLinus Torvalds case 0: cleanmarkerfound = 1; break; 4581da177e4SLinus Torvalds case 1: break; 4591da177e4SLinus Torvalds case 2: return BLK_STATE_BADBLOCK; 4601da177e4SLinus Torvalds case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */ 4611da177e4SLinus Torvalds default: return ret; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds #endif 465e631ddbaSFerenc Havasi 466e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 4679641b784SDavid Woodhouse struct jffs2_sum_marker *sm; 4689641b784SDavid Woodhouse void *sumptr = NULL; 4699641b784SDavid Woodhouse uint32_t sumlen; 470e631ddbaSFerenc Havasi 4719641b784SDavid Woodhouse if (!buf_size) { 4729641b784SDavid Woodhouse /* XIP case. Just look, point at the summary if it's there */ 4739641b784SDavid Woodhouse sm = (void *)buf + jeb->offset - sizeof(*sm); 474e631ddbaSFerenc Havasi if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 4759641b784SDavid Woodhouse sumptr = buf + je32_to_cpu(sm->offset); 4769641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 4779641b784SDavid Woodhouse } 4789641b784SDavid Woodhouse } else { 4799641b784SDavid Woodhouse /* If NAND flash, read a whole page of it. Else just the end */ 4809641b784SDavid Woodhouse if (c->wbuf_pagesize) 4819641b784SDavid Woodhouse buf_len = c->wbuf_pagesize; 4829641b784SDavid Woodhouse else 4839641b784SDavid Woodhouse buf_len = sizeof(*sm); 4849641b784SDavid Woodhouse 4859641b784SDavid Woodhouse /* Read as much as we want into the _end_ of the preallocated buffer */ 4869641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, 4879641b784SDavid Woodhouse jeb->offset + c->sector_size - buf_len, 4889641b784SDavid Woodhouse buf_len); 4899641b784SDavid Woodhouse if (err) 4909641b784SDavid Woodhouse return err; 4919641b784SDavid Woodhouse 4929641b784SDavid Woodhouse sm = (void *)buf + buf_size - sizeof(*sm); 4939641b784SDavid Woodhouse if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 4949641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 4959641b784SDavid Woodhouse sumptr = buf + buf_size - sumlen; 4969641b784SDavid Woodhouse 4979641b784SDavid Woodhouse /* Now, make sure the summary itself is available */ 4989641b784SDavid Woodhouse if (sumlen > buf_size) { 4999641b784SDavid Woodhouse /* Need to kmalloc for this. */ 5009641b784SDavid Woodhouse sumptr = kmalloc(sumlen, GFP_KERNEL); 5019641b784SDavid Woodhouse if (!sumptr) 5029641b784SDavid Woodhouse return -ENOMEM; 5039641b784SDavid Woodhouse memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); 5049641b784SDavid Woodhouse } 5059641b784SDavid Woodhouse if (buf_len < sumlen) { 5069641b784SDavid Woodhouse /* Need to read more so that the entire summary node is present */ 5079641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, sumptr, 5089641b784SDavid Woodhouse jeb->offset + c->sector_size - sumlen, 5099641b784SDavid Woodhouse sumlen - buf_len); 5109641b784SDavid Woodhouse if (err) 511e631ddbaSFerenc Havasi return err; 512e631ddbaSFerenc Havasi } 513e631ddbaSFerenc Havasi } 514e631ddbaSFerenc Havasi 5159641b784SDavid Woodhouse } 5169641b784SDavid Woodhouse 5179641b784SDavid Woodhouse if (sumptr) { 5189641b784SDavid Woodhouse err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); 5199641b784SDavid Woodhouse if (err) 5209641b784SDavid Woodhouse return err; 5219641b784SDavid Woodhouse if (buf_size && sumlen > buf_size) 5229641b784SDavid Woodhouse kfree(sumptr); 5239641b784SDavid Woodhouse } 524e631ddbaSFerenc Havasi } 525e631ddbaSFerenc Havasi 5261da177e4SLinus Torvalds buf_ofs = jeb->offset; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds if (!buf_size) { 5299641b784SDavid Woodhouse /* This is the XIP case -- we're reading _directly_ from the flash chip */ 5301da177e4SLinus Torvalds buf_len = c->sector_size; 5311da177e4SLinus Torvalds } else { 5323be36675SAndrew Victor buf_len = EMPTY_SCAN_SIZE(c->sector_size); 5331da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); 5341da177e4SLinus Torvalds if (err) 5351da177e4SLinus Torvalds return err; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ 5391da177e4SLinus Torvalds ofs = 0; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* Scan only 4KiB of 0xFF before declaring it's empty */ 5423be36675SAndrew Victor while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) 5431da177e4SLinus Torvalds ofs += 4; 5441da177e4SLinus Torvalds 5453be36675SAndrew Victor if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) { 5462f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 5471da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 5481da177e4SLinus Torvalds /* scan oob, take care of cleanmarker */ 5491da177e4SLinus Torvalds int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); 5501da177e4SLinus Torvalds D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret)); 5511da177e4SLinus Torvalds switch (ret) { 5521da177e4SLinus Torvalds case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; 5531da177e4SLinus Torvalds case 1: return BLK_STATE_ALLDIRTY; 5541da177e4SLinus Torvalds default: return ret; 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds #endif 5581da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset)); 5598f15fd55SAndrew Victor if (c->cleanmarker_size == 0) 5608f15fd55SAndrew Victor return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ 5618f15fd55SAndrew Victor else 5621da177e4SLinus Torvalds return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds if (ofs) { 5651da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset, 5661da177e4SLinus Torvalds jeb->offset + ofs)); 5671da177e4SLinus Torvalds DIRTY_SPACE(ofs); 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /* Now ofs is a complete physical flash offset as it always was... */ 5711da177e4SLinus Torvalds ofs += jeb->offset; 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds noise = 10; 5741da177e4SLinus Torvalds 575733802d9SArtem B. Bityutskiy dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); 576e631ddbaSFerenc Havasi 5771da177e4SLinus Torvalds scan_more: 5781da177e4SLinus Torvalds while(ofs < jeb->offset + c->sector_size) { 5791da177e4SLinus Torvalds 580e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds cond_resched(); 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds if (ofs & 3) { 5851da177e4SLinus Torvalds printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs); 5861da177e4SLinus Torvalds ofs = PAD(ofs); 5871da177e4SLinus Torvalds continue; 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds if (ofs == prevofs) { 5901da177e4SLinus Torvalds printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs); 5911da177e4SLinus Torvalds DIRTY_SPACE(4); 5921da177e4SLinus Torvalds ofs += 4; 5931da177e4SLinus Torvalds continue; 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds prevofs = ofs; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { 5981da177e4SLinus Torvalds 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), 5991da177e4SLinus Torvalds jeb->offset, c->sector_size, ofs, sizeof(*node))); 6001da177e4SLinus Torvalds DIRTY_SPACE((jeb->offset + c->sector_size)-ofs); 6011da177e4SLinus Torvalds break; 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(*node)) { 6051da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 6061da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", 6071da177e4SLinus Torvalds sizeof(struct jffs2_unknown_node), buf_len, ofs)); 6081da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 6091da177e4SLinus Torvalds if (err) 6101da177e4SLinus Torvalds return err; 6111da177e4SLinus Torvalds buf_ofs = ofs; 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { 6171da177e4SLinus Torvalds uint32_t inbuf_ofs; 6181da177e4SLinus Torvalds uint32_t empty_start; 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds empty_start = ofs; 6211da177e4SLinus Torvalds ofs += 4; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); 6241da177e4SLinus Torvalds more_empty: 6251da177e4SLinus Torvalds inbuf_ofs = ofs - buf_ofs; 6261da177e4SLinus Torvalds while (inbuf_ofs < buf_len) { 6271da177e4SLinus Torvalds if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff) { 6281da177e4SLinus Torvalds printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", 6291da177e4SLinus Torvalds empty_start, ofs); 6301da177e4SLinus Torvalds DIRTY_SPACE(ofs-empty_start); 6311da177e4SLinus Torvalds goto scan_more; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds inbuf_ofs+=4; 6351da177e4SLinus Torvalds ofs += 4; 6361da177e4SLinus Torvalds } 6371da177e4SLinus Torvalds /* Ran off end. */ 6381da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs)); 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /* If we're only checking the beginning of a block with a cleanmarker, 6411da177e4SLinus Torvalds bail now */ 6421da177e4SLinus Torvalds if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && 643b81226c5SArtem B. Bityuckiy c->cleanmarker_size && !jeb->dirty_size && !jeb->first_node->next_phys) { 6443be36675SAndrew Victor D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); 6451da177e4SLinus Torvalds return BLK_STATE_CLEANMARKER; 6461da177e4SLinus Torvalds } 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds /* See how much more there is to read in this eraseblock... */ 6491da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 6501da177e4SLinus Torvalds if (!buf_len) { 6511da177e4SLinus Torvalds /* No more to read. Break out of main loop without marking 6521da177e4SLinus Torvalds this range of empty space as dirty (because it's not) */ 6531da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n", 6541da177e4SLinus Torvalds empty_start)); 6551da177e4SLinus Torvalds break; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); 6581da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 6591da177e4SLinus Torvalds if (err) 6601da177e4SLinus Torvalds return err; 6611da177e4SLinus Torvalds buf_ofs = ofs; 6621da177e4SLinus Torvalds goto more_empty; 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { 6661da177e4SLinus Torvalds printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); 6671da177e4SLinus Torvalds DIRTY_SPACE(4); 6681da177e4SLinus Torvalds ofs += 4; 6691da177e4SLinus Torvalds continue; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { 6721da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs)); 6731da177e4SLinus Torvalds DIRTY_SPACE(4); 6741da177e4SLinus Torvalds ofs += 4; 6751da177e4SLinus Torvalds continue; 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { 6781da177e4SLinus Torvalds printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs); 6791da177e4SLinus Torvalds printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n"); 6801da177e4SLinus Torvalds DIRTY_SPACE(4); 6811da177e4SLinus Torvalds ofs += 4; 6821da177e4SLinus Torvalds continue; 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { 6851da177e4SLinus Torvalds /* OK. We're out of possibilities. Whinge and move on */ 6861da177e4SLinus Torvalds noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", 6871da177e4SLinus Torvalds JFFS2_MAGIC_BITMASK, ofs, 6881da177e4SLinus Torvalds je16_to_cpu(node->magic)); 6891da177e4SLinus Torvalds DIRTY_SPACE(4); 6901da177e4SLinus Torvalds ofs += 4; 6911da177e4SLinus Torvalds continue; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds /* We seem to have a node of sorts. Check the CRC */ 6941da177e4SLinus Torvalds crcnode.magic = node->magic; 6951da177e4SLinus Torvalds crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); 6961da177e4SLinus Torvalds crcnode.totlen = node->totlen; 6971da177e4SLinus Torvalds hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds if (hdr_crc != je32_to_cpu(node->hdr_crc)) { 7001da177e4SLinus Torvalds 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", 7011da177e4SLinus Torvalds ofs, je16_to_cpu(node->magic), 7021da177e4SLinus Torvalds je16_to_cpu(node->nodetype), 7031da177e4SLinus Torvalds je32_to_cpu(node->totlen), 7041da177e4SLinus Torvalds je32_to_cpu(node->hdr_crc), 7051da177e4SLinus Torvalds hdr_crc); 7061da177e4SLinus Torvalds DIRTY_SPACE(4); 7071da177e4SLinus Torvalds ofs += 4; 7081da177e4SLinus Torvalds continue; 7091da177e4SLinus Torvalds } 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds if (ofs + je32_to_cpu(node->totlen) > 7121da177e4SLinus Torvalds jeb->offset + c->sector_size) { 7131da177e4SLinus Torvalds /* Eep. Node goes over the end of the erase block. */ 7141da177e4SLinus Torvalds printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", 7151da177e4SLinus Torvalds ofs, je32_to_cpu(node->totlen)); 7161da177e4SLinus Torvalds printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n"); 7171da177e4SLinus Torvalds DIRTY_SPACE(4); 7181da177e4SLinus Torvalds ofs += 4; 7191da177e4SLinus Torvalds continue; 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { 7231da177e4SLinus Torvalds /* Wheee. This is an obsoleted node */ 7241da177e4SLinus Torvalds D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs)); 7251da177e4SLinus Torvalds DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); 7261da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 7271da177e4SLinus Torvalds continue; 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds switch(je16_to_cpu(node->nodetype)) { 7311da177e4SLinus Torvalds case JFFS2_NODETYPE_INODE: 7321da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { 7331da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 7341da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", 7351da177e4SLinus Torvalds sizeof(struct jffs2_raw_inode), buf_len, ofs)); 7361da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 7371da177e4SLinus Torvalds if (err) 7381da177e4SLinus Torvalds return err; 7391da177e4SLinus Torvalds buf_ofs = ofs; 7401da177e4SLinus Torvalds node = (void *)buf; 7411da177e4SLinus Torvalds } 742e631ddbaSFerenc Havasi err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); 7431da177e4SLinus Torvalds if (err) return err; 7441da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 7451da177e4SLinus Torvalds break; 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds case JFFS2_NODETYPE_DIRENT: 7481da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 7491da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 7501da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", 7511da177e4SLinus Torvalds je32_to_cpu(node->totlen), buf_len, ofs)); 7521da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 7531da177e4SLinus Torvalds if (err) 7541da177e4SLinus Torvalds return err; 7551da177e4SLinus Torvalds buf_ofs = ofs; 7561da177e4SLinus Torvalds node = (void *)buf; 7571da177e4SLinus Torvalds } 758e631ddbaSFerenc Havasi err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); 7591da177e4SLinus Torvalds if (err) return err; 7601da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 7611da177e4SLinus Torvalds break; 7621da177e4SLinus Torvalds 763aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 764aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XATTR: 765aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 766aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 767aa98d7cfSKaiGai Kohei D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)" 768aa98d7cfSKaiGai Kohei " left to end of buf. Reading 0x%x at 0x%08x\n", 769aa98d7cfSKaiGai Kohei je32_to_cpu(node->totlen), buf_len, ofs)); 770aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 771aa98d7cfSKaiGai Kohei if (err) 772aa98d7cfSKaiGai Kohei return err; 773aa98d7cfSKaiGai Kohei buf_ofs = ofs; 774aa98d7cfSKaiGai Kohei node = (void *)buf; 775aa98d7cfSKaiGai Kohei } 776aa98d7cfSKaiGai Kohei err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); 777aa98d7cfSKaiGai Kohei if (err) 778aa98d7cfSKaiGai Kohei return err; 779aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 780aa98d7cfSKaiGai Kohei break; 781aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XREF: 782aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 783aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 784aa98d7cfSKaiGai Kohei D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)" 785aa98d7cfSKaiGai Kohei " left to end of buf. Reading 0x%x at 0x%08x\n", 786aa98d7cfSKaiGai Kohei je32_to_cpu(node->totlen), buf_len, ofs)); 787aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 788aa98d7cfSKaiGai Kohei if (err) 789aa98d7cfSKaiGai Kohei return err; 790aa98d7cfSKaiGai Kohei buf_ofs = ofs; 791aa98d7cfSKaiGai Kohei node = (void *)buf; 792aa98d7cfSKaiGai Kohei } 793aa98d7cfSKaiGai Kohei err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); 794aa98d7cfSKaiGai Kohei if (err) 795aa98d7cfSKaiGai Kohei return err; 796aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 797aa98d7cfSKaiGai Kohei break; 798aa98d7cfSKaiGai Kohei #endif /* CONFIG_JFFS2_FS_XATTR */ 799aa98d7cfSKaiGai Kohei 8001da177e4SLinus Torvalds case JFFS2_NODETYPE_CLEANMARKER: 8011da177e4SLinus Torvalds D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs)); 8021da177e4SLinus Torvalds if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { 8031da177e4SLinus Torvalds printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", 8041da177e4SLinus Torvalds ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); 8051da177e4SLinus Torvalds DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node))); 8061da177e4SLinus Torvalds ofs += PAD(sizeof(struct jffs2_unknown_node)); 8071da177e4SLinus Torvalds } else if (jeb->first_node) { 8081da177e4SLinus Torvalds printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); 8091da177e4SLinus Torvalds DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node))); 8101da177e4SLinus Torvalds ofs += PAD(sizeof(struct jffs2_unknown_node)); 8111da177e4SLinus Torvalds } else { 8121da177e4SLinus Torvalds struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref(); 8131da177e4SLinus Torvalds if (!marker_ref) { 8141da177e4SLinus Torvalds printk(KERN_NOTICE "Failed to allocate node ref for clean marker\n"); 8151da177e4SLinus Torvalds return -ENOMEM; 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds marker_ref->next_in_ino = NULL; 8181da177e4SLinus Torvalds marker_ref->flash_offset = ofs | REF_NORMAL; 8191da177e4SLinus Torvalds 820f1f9671bSDavid Woodhouse jffs2_link_node_ref(c, jeb, marker_ref, c->cleanmarker_size); 821f1f9671bSDavid Woodhouse 8221da177e4SLinus Torvalds ofs += PAD(c->cleanmarker_size); 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds break; 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds case JFFS2_NODETYPE_PADDING: 827e631ddbaSFerenc Havasi if (jffs2_sum_active()) 828e631ddbaSFerenc Havasi jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); 8291da177e4SLinus Torvalds DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); 8301da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8311da177e4SLinus Torvalds break; 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds default: 8341da177e4SLinus Torvalds switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { 8351da177e4SLinus Torvalds case JFFS2_FEATURE_ROCOMPAT: 8361da177e4SLinus Torvalds printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); 8371da177e4SLinus Torvalds c->flags |= JFFS2_SB_FLAG_RO; 8381da177e4SLinus Torvalds if (!(jffs2_is_readonly(c))) 8391da177e4SLinus Torvalds return -EROFS; 8401da177e4SLinus Torvalds DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); 8411da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8421da177e4SLinus Torvalds break; 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds case JFFS2_FEATURE_INCOMPAT: 8451da177e4SLinus Torvalds printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); 8461da177e4SLinus Torvalds return -EINVAL; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds case JFFS2_FEATURE_RWCOMPAT_DELETE: 8491da177e4SLinus Torvalds D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); 8501da177e4SLinus Torvalds DIRTY_SPACE(PAD(je32_to_cpu(node->totlen))); 8511da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8521da177e4SLinus Torvalds break; 8531da177e4SLinus Torvalds 8546171586aSDavid Woodhouse case JFFS2_FEATURE_RWCOMPAT_COPY: { 8556171586aSDavid Woodhouse struct jffs2_raw_node_ref *ref; 8561da177e4SLinus Torvalds D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); 8576171586aSDavid Woodhouse 8586171586aSDavid Woodhouse ref = jffs2_alloc_raw_node_ref(); 8596171586aSDavid Woodhouse if (!ref) 8606171586aSDavid Woodhouse return -ENOMEM; 8616171586aSDavid Woodhouse ref->flash_offset = ofs | REF_PRISTINE; 8626171586aSDavid Woodhouse ref->next_in_ino = 0; 8636171586aSDavid Woodhouse jffs2_link_node_ref(c, jeb, ref, PAD(je32_to_cpu(node->totlen))); 8646171586aSDavid Woodhouse 8656171586aSDavid Woodhouse /* We can't summarise nodes we don't grok */ 8666171586aSDavid Woodhouse jffs2_sum_disable_collecting(s); 8671da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8681da177e4SLinus Torvalds break; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds } 8726171586aSDavid Woodhouse } 8731da177e4SLinus Torvalds 874e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 875e631ddbaSFerenc Havasi if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { 876733802d9SArtem B. Bityutskiy dbg_summary("There is not enough space for " 877e631ddbaSFerenc Havasi "summary information, disabling for this jeb!\n"); 878e631ddbaSFerenc Havasi jffs2_sum_disable_collecting(s); 879e631ddbaSFerenc Havasi } 880e631ddbaSFerenc Havasi } 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x\n", jeb->offset, 8831da177e4SLinus Torvalds jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size)); 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds /* mark_node_obsolete can add to wasted !! */ 8861da177e4SLinus Torvalds if (jeb->wasted_size) { 8871da177e4SLinus Torvalds jeb->dirty_size += jeb->wasted_size; 8881da177e4SLinus Torvalds c->dirty_size += jeb->wasted_size; 8891da177e4SLinus Torvalds c->wasted_size -= jeb->wasted_size; 8901da177e4SLinus Torvalds jeb->wasted_size = 0; 8911da177e4SLinus Torvalds } 8921da177e4SLinus Torvalds 893e631ddbaSFerenc Havasi return jffs2_scan_classify_jeb(c, jeb); 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 896e631ddbaSFerenc Havasi struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) 8971da177e4SLinus Torvalds { 8981da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 9011da177e4SLinus Torvalds if (ic) 9021da177e4SLinus Torvalds return ic; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds if (ino > c->highest_ino) 9051da177e4SLinus Torvalds c->highest_ino = ino; 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds ic = jffs2_alloc_inode_cache(); 9081da177e4SLinus Torvalds if (!ic) { 9091da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n"); 9101da177e4SLinus Torvalds return NULL; 9111da177e4SLinus Torvalds } 9121da177e4SLinus Torvalds memset(ic, 0, sizeof(*ic)); 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds ic->ino = ino; 9151da177e4SLinus Torvalds ic->nodes = (void *)ic; 9161da177e4SLinus Torvalds jffs2_add_ino_cache(c, ic); 9171da177e4SLinus Torvalds if (ino == 1) 9181da177e4SLinus Torvalds ic->nlink = 1; 9191da177e4SLinus Torvalds return ic; 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 923e631ddbaSFerenc Havasi struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) 9241da177e4SLinus Torvalds { 9251da177e4SLinus Torvalds struct jffs2_raw_node_ref *raw; 9261da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 9271da177e4SLinus Torvalds uint32_t ino = je32_to_cpu(ri->ino); 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds /* We do very little here now. Just check the ino# to which we should attribute 9321da177e4SLinus Torvalds this node; we can do all the CRC checking etc. later. There's a tradeoff here -- 9331da177e4SLinus Torvalds we used to scan the flash once only, reading everything we want from it into 9341da177e4SLinus Torvalds memory, then building all our in-core data structures and freeing the extra 9351da177e4SLinus Torvalds information. Now we allow the first part of the mount to complete a lot quicker, 9361da177e4SLinus Torvalds but we have to go _back_ to the flash in order to finish the CRC checking, etc. 9371da177e4SLinus Torvalds Which means that the _full_ amount of time to get to proper write mode with GC 9381da177e4SLinus Torvalds operational may actually be _longer_ than before. Sucks to be me. */ 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds raw = jffs2_alloc_raw_node_ref(); 9411da177e4SLinus Torvalds if (!raw) { 9421da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_inode_node(): allocation of node reference failed\n"); 9431da177e4SLinus Torvalds return -ENOMEM; 9441da177e4SLinus Torvalds } 9451da177e4SLinus Torvalds 9461da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 9471da177e4SLinus Torvalds if (!ic) { 9481da177e4SLinus Torvalds /* Inocache get failed. Either we read a bogus ino# or it's just genuinely the 9491da177e4SLinus Torvalds first node we found for this inode. Do a CRC check to protect against the former 9501da177e4SLinus Torvalds case */ 9511da177e4SLinus Torvalds uint32_t crc = crc32(0, ri, sizeof(*ri)-8); 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds if (crc != je32_to_cpu(ri->node_crc)) { 9541da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 9551da177e4SLinus Torvalds ofs, je32_to_cpu(ri->node_crc), crc); 9561da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ 9571da177e4SLinus Torvalds DIRTY_SPACE(PAD(je32_to_cpu(ri->totlen))); 9581da177e4SLinus Torvalds jffs2_free_raw_node_ref(raw); 9591da177e4SLinus Torvalds return 0; 9601da177e4SLinus Torvalds } 9611da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, ino); 9621da177e4SLinus Torvalds if (!ic) { 9631da177e4SLinus Torvalds jffs2_free_raw_node_ref(raw); 9641da177e4SLinus Torvalds return -ENOMEM; 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds /* Wheee. It worked */ 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds raw->flash_offset = ofs | REF_UNCHECKED; 9711da177e4SLinus Torvalds 972f1f9671bSDavid Woodhouse raw->next_in_ino = ic->nodes; 9731da177e4SLinus Torvalds ic->nodes = raw; 974f1f9671bSDavid Woodhouse 975f1f9671bSDavid Woodhouse jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(ri->totlen))); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n", 9781da177e4SLinus Torvalds je32_to_cpu(ri->ino), je32_to_cpu(ri->version), 9791da177e4SLinus Torvalds je32_to_cpu(ri->offset), 9801da177e4SLinus Torvalds je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize))); 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds pseudo_random += je32_to_cpu(ri->version); 9831da177e4SLinus Torvalds 984e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 985e631ddbaSFerenc Havasi jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); 986e631ddbaSFerenc Havasi } 987e631ddbaSFerenc Havasi 9881da177e4SLinus Torvalds return 0; 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 992e631ddbaSFerenc Havasi struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) 9931da177e4SLinus Torvalds { 9941da177e4SLinus Torvalds struct jffs2_raw_node_ref *raw; 9951da177e4SLinus Torvalds struct jffs2_full_dirent *fd; 9961da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 9971da177e4SLinus Torvalds uint32_t crc; 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs)); 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds /* We don't get here unless the node is still valid, so we don't have to 10021da177e4SLinus Torvalds mask in the ACCURATE bit any more. */ 10031da177e4SLinus Torvalds crc = crc32(0, rd, sizeof(*rd)-8); 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->node_crc)) { 10061da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 10071da177e4SLinus Torvalds ofs, je32_to_cpu(rd->node_crc), crc); 10081da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ 10091da177e4SLinus Torvalds DIRTY_SPACE(PAD(je32_to_cpu(rd->totlen))); 10101da177e4SLinus Torvalds return 0; 10111da177e4SLinus Torvalds } 10121da177e4SLinus Torvalds 10131da177e4SLinus Torvalds pseudo_random += je32_to_cpu(rd->version); 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds fd = jffs2_alloc_full_dirent(rd->nsize+1); 10161da177e4SLinus Torvalds if (!fd) { 10171da177e4SLinus Torvalds return -ENOMEM; 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds memcpy(&fd->name, rd->name, rd->nsize); 10201da177e4SLinus Torvalds fd->name[rd->nsize] = 0; 10211da177e4SLinus Torvalds 10221da177e4SLinus Torvalds crc = crc32(0, fd->name, rd->nsize); 10231da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->name_crc)) { 10241da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 10251da177e4SLinus Torvalds ofs, je32_to_cpu(rd->name_crc), crc); 10261da177e4SLinus Torvalds D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino))); 10271da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10281da177e4SLinus Torvalds /* FIXME: Why do we believe totlen? */ 10291da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ 10301da177e4SLinus Torvalds DIRTY_SPACE(PAD(je32_to_cpu(rd->totlen))); 10311da177e4SLinus Torvalds return 0; 10321da177e4SLinus Torvalds } 10331da177e4SLinus Torvalds raw = jffs2_alloc_raw_node_ref(); 10341da177e4SLinus Torvalds if (!raw) { 10351da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10361da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_dirent_node(): allocation of node reference failed\n"); 10371da177e4SLinus Torvalds return -ENOMEM; 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); 10401da177e4SLinus Torvalds if (!ic) { 10411da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10421da177e4SLinus Torvalds jffs2_free_raw_node_ref(raw); 10431da177e4SLinus Torvalds return -ENOMEM; 10441da177e4SLinus Torvalds } 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds raw->flash_offset = ofs | REF_PRISTINE; 10471da177e4SLinus Torvalds raw->next_in_ino = ic->nodes; 10481da177e4SLinus Torvalds ic->nodes = raw; 1049f1f9671bSDavid Woodhouse 1050f1f9671bSDavid Woodhouse jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(rd->totlen))); 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds fd->raw = raw; 10531da177e4SLinus Torvalds fd->next = NULL; 10541da177e4SLinus Torvalds fd->version = je32_to_cpu(rd->version); 10551da177e4SLinus Torvalds fd->ino = je32_to_cpu(rd->ino); 10561da177e4SLinus Torvalds fd->nhash = full_name_hash(fd->name, rd->nsize); 10571da177e4SLinus Torvalds fd->type = rd->type; 10581da177e4SLinus Torvalds jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 10591da177e4SLinus Torvalds 1060e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1061e631ddbaSFerenc Havasi jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); 1062e631ddbaSFerenc Havasi } 1063e631ddbaSFerenc Havasi 10641da177e4SLinus Torvalds return 0; 10651da177e4SLinus Torvalds } 10661da177e4SLinus Torvalds 10671da177e4SLinus Torvalds static int count_list(struct list_head *l) 10681da177e4SLinus Torvalds { 10691da177e4SLinus Torvalds uint32_t count = 0; 10701da177e4SLinus Torvalds struct list_head *tmp; 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds list_for_each(tmp, l) { 10731da177e4SLinus Torvalds count++; 10741da177e4SLinus Torvalds } 10751da177e4SLinus Torvalds return count; 10761da177e4SLinus Torvalds } 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds /* Note: This breaks if list_empty(head). I don't care. You 10791da177e4SLinus Torvalds might, if you copy this code and use it elsewhere :) */ 10801da177e4SLinus Torvalds static void rotate_list(struct list_head *head, uint32_t count) 10811da177e4SLinus Torvalds { 10821da177e4SLinus Torvalds struct list_head *n = head->next; 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds list_del(head); 10851da177e4SLinus Torvalds while(count--) { 10861da177e4SLinus Torvalds n = n->next; 10871da177e4SLinus Torvalds } 10881da177e4SLinus Torvalds list_add(head, n); 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds void jffs2_rotate_lists(struct jffs2_sb_info *c) 10921da177e4SLinus Torvalds { 10931da177e4SLinus Torvalds uint32_t x; 10941da177e4SLinus Torvalds uint32_t rotateby; 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds x = count_list(&c->clean_list); 10971da177e4SLinus Torvalds if (x) { 10981da177e4SLinus Torvalds rotateby = pseudo_random % x; 10991da177e4SLinus Torvalds rotate_list((&c->clean_list), rotateby); 11001da177e4SLinus Torvalds } 11011da177e4SLinus Torvalds 11021da177e4SLinus Torvalds x = count_list(&c->very_dirty_list); 11031da177e4SLinus Torvalds if (x) { 11041da177e4SLinus Torvalds rotateby = pseudo_random % x; 11051da177e4SLinus Torvalds rotate_list((&c->very_dirty_list), rotateby); 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds x = count_list(&c->dirty_list); 11091da177e4SLinus Torvalds if (x) { 11101da177e4SLinus Torvalds rotateby = pseudo_random % x; 11111da177e4SLinus Torvalds rotate_list((&c->dirty_list), rotateby); 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds x = count_list(&c->erasable_list); 11151da177e4SLinus Torvalds if (x) { 11161da177e4SLinus Torvalds rotateby = pseudo_random % x; 11171da177e4SLinus Torvalds rotate_list((&c->erasable_list), rotateby); 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 11211da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_erasing_blocks; 11221da177e4SLinus Torvalds rotate_list((&c->erase_pending_list), rotateby); 11231da177e4SLinus Torvalds } 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds if (c->nr_free_blocks) { 11261da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_free_blocks; 11271da177e4SLinus Torvalds rotate_list((&c->free_list), rotateby); 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds } 1130