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 6825090a6bSDavid Woodhouse static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 6925090a6bSDavid Woodhouse { 70a6a8bef7SDavid Woodhouse int ret; 71a6a8bef7SDavid Woodhouse 72a6a8bef7SDavid Woodhouse if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1))) 73a6a8bef7SDavid Woodhouse return ret; 74a6a8bef7SDavid Woodhouse if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size))) 7525090a6bSDavid Woodhouse return ret; 7625090a6bSDavid Woodhouse /* Turned wasted size into dirty, since we apparently 7725090a6bSDavid Woodhouse think it's recoverable now. */ 7825090a6bSDavid Woodhouse jeb->dirty_size += jeb->wasted_size; 7925090a6bSDavid Woodhouse c->dirty_size += jeb->wasted_size; 8025090a6bSDavid Woodhouse c->wasted_size -= jeb->wasted_size; 8125090a6bSDavid Woodhouse jeb->wasted_size = 0; 8225090a6bSDavid Woodhouse if (VERYDIRTY(c, jeb->dirty_size)) { 8325090a6bSDavid Woodhouse list_add(&jeb->list, &c->very_dirty_list); 8425090a6bSDavid Woodhouse } else { 8525090a6bSDavid Woodhouse list_add(&jeb->list, &c->dirty_list); 8625090a6bSDavid Woodhouse } 8725090a6bSDavid Woodhouse return 0; 8825090a6bSDavid Woodhouse } 8925090a6bSDavid Woodhouse 901da177e4SLinus Torvalds int jffs2_scan_medium(struct jffs2_sb_info *c) 911da177e4SLinus Torvalds { 921da177e4SLinus Torvalds int i, ret; 931da177e4SLinus Torvalds uint32_t empty_blocks = 0, bad_blocks = 0; 941da177e4SLinus Torvalds unsigned char *flashbuf = NULL; 951da177e4SLinus Torvalds uint32_t buf_size = 0; 96e631ddbaSFerenc Havasi struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ 971da177e4SLinus Torvalds #ifndef __ECOS 981da177e4SLinus Torvalds size_t pointlen; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds if (c->mtd->point) { 1011da177e4SLinus Torvalds ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf); 1021da177e4SLinus Torvalds if (!ret && pointlen < c->mtd->size) { 1031da177e4SLinus Torvalds /* Don't muck about if it won't let us point to the whole flash */ 1041da177e4SLinus Torvalds D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen)); 1051da177e4SLinus Torvalds c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); 1061da177e4SLinus Torvalds flashbuf = NULL; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds if (ret) 1091da177e4SLinus Torvalds D1(printk(KERN_DEBUG "MTD point failed %d\n", ret)); 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds #endif 1121da177e4SLinus Torvalds if (!flashbuf) { 1131da177e4SLinus Torvalds /* For NAND it's quicker to read a whole eraseblock at a time, 1141da177e4SLinus Torvalds apparently */ 1151da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 1161da177e4SLinus Torvalds buf_size = c->sector_size; 1171da177e4SLinus Torvalds else 1181da177e4SLinus Torvalds buf_size = PAGE_SIZE; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds /* Respect kmalloc limitations */ 1211da177e4SLinus Torvalds if (buf_size > 128*1024) 1221da177e4SLinus Torvalds buf_size = 128*1024; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size)); 1251da177e4SLinus Torvalds flashbuf = kmalloc(buf_size, GFP_KERNEL); 1261da177e4SLinus Torvalds if (!flashbuf) 1271da177e4SLinus Torvalds return -ENOMEM; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 130e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1313d375d9eSYan Burman s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 132e631ddbaSFerenc Havasi if (!s) { 13385de3d9bSAmit Choudhary kfree(flashbuf); 134e631ddbaSFerenc Havasi JFFS2_WARNING("Can't allocate memory for summary\n"); 135e631ddbaSFerenc Havasi return -ENOMEM; 136e631ddbaSFerenc Havasi } 137e631ddbaSFerenc Havasi } 138e631ddbaSFerenc Havasi 1391da177e4SLinus Torvalds for (i=0; i<c->nr_blocks; i++) { 1401da177e4SLinus Torvalds struct jffs2_eraseblock *jeb = &c->blocks[i]; 1411da177e4SLinus Torvalds 142a2166b93SArtem Bityutskiy cond_resched(); 143a2166b93SArtem Bityutskiy 144e631ddbaSFerenc Havasi /* reset summary info for next eraseblock scan */ 145e631ddbaSFerenc Havasi jffs2_sum_reset_collected(s); 146e631ddbaSFerenc Havasi 147e631ddbaSFerenc Havasi ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), 148e631ddbaSFerenc Havasi buf_size, s); 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds if (ret < 0) 1511da177e4SLinus Torvalds goto out; 1521da177e4SLinus Torvalds 153e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* Now decide which list to put it on */ 1561da177e4SLinus Torvalds switch(ret) { 1571da177e4SLinus Torvalds case BLK_STATE_ALLFF: 1581da177e4SLinus Torvalds /* 1591da177e4SLinus Torvalds * Empty block. Since we can't be sure it 1601da177e4SLinus Torvalds * was entirely erased, we just queue it for erase 1611da177e4SLinus Torvalds * again. It will be marked as such when the erase 1621da177e4SLinus Torvalds * is complete. Meanwhile we still count it as empty 1631da177e4SLinus Torvalds * for later checks. 1641da177e4SLinus Torvalds */ 1651da177e4SLinus Torvalds empty_blocks++; 1661da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1671da177e4SLinus Torvalds c->nr_erasing_blocks++; 1681da177e4SLinus Torvalds break; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds case BLK_STATE_CLEANMARKER: 1711da177e4SLinus Torvalds /* Only a CLEANMARKER node is valid */ 1721da177e4SLinus Torvalds if (!jeb->dirty_size) { 1731da177e4SLinus Torvalds /* It's actually free */ 1741da177e4SLinus Torvalds list_add(&jeb->list, &c->free_list); 1751da177e4SLinus Torvalds c->nr_free_blocks++; 1761da177e4SLinus Torvalds } else { 1771da177e4SLinus Torvalds /* Dirt */ 1781da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset)); 1791da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1801da177e4SLinus Torvalds c->nr_erasing_blocks++; 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds break; 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds case BLK_STATE_CLEAN: 1851da177e4SLinus Torvalds /* Full (or almost full) of clean data. Clean list */ 1861da177e4SLinus Torvalds list_add(&jeb->list, &c->clean_list); 1871da177e4SLinus Torvalds break; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds case BLK_STATE_PARTDIRTY: 1901da177e4SLinus Torvalds /* Some data, but not full. Dirty list. */ 1911da177e4SLinus Torvalds /* We want to remember the block with most free space 1921da177e4SLinus Torvalds and stick it in the 'nextblock' position to start writing to it. */ 1931da177e4SLinus Torvalds if (jeb->free_size > min_free(c) && 1941da177e4SLinus Torvalds (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { 1951da177e4SLinus Torvalds /* Better candidate for the next writes to go to */ 1961da177e4SLinus Torvalds if (c->nextblock) { 19725090a6bSDavid Woodhouse ret = file_dirty(c, c->nextblock); 19825090a6bSDavid Woodhouse if (ret) 19925090a6bSDavid Woodhouse return ret; 200e631ddbaSFerenc Havasi /* deleting summary information of the old nextblock */ 201e631ddbaSFerenc Havasi jffs2_sum_reset_collected(c->summary); 2021da177e4SLinus Torvalds } 20325090a6bSDavid Woodhouse /* update collected summary information for the current nextblock */ 204e631ddbaSFerenc Havasi jffs2_sum_move_collected(c, s); 205e631ddbaSFerenc Havasi D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset)); 2061da177e4SLinus Torvalds c->nextblock = jeb; 2071da177e4SLinus Torvalds } else { 20825090a6bSDavid Woodhouse ret = file_dirty(c, jeb); 20925090a6bSDavid Woodhouse if (ret) 21025090a6bSDavid Woodhouse return ret; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds break; 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds case BLK_STATE_ALLDIRTY: 2151da177e4SLinus Torvalds /* Nothing valid - not even a clean marker. Needs erasing. */ 2161da177e4SLinus Torvalds /* For now we just put it on the erasing list. We'll start the erases later */ 2171da177e4SLinus Torvalds D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset)); 2181da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 2191da177e4SLinus Torvalds c->nr_erasing_blocks++; 2201da177e4SLinus Torvalds break; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds case BLK_STATE_BADBLOCK: 2231da177e4SLinus Torvalds D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset)); 2241da177e4SLinus Torvalds list_add(&jeb->list, &c->bad_list); 2251da177e4SLinus Torvalds c->bad_size += c->sector_size; 2261da177e4SLinus Torvalds c->free_size -= c->sector_size; 2271da177e4SLinus Torvalds bad_blocks++; 2281da177e4SLinus Torvalds break; 2291da177e4SLinus Torvalds default: 2301da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n"); 2311da177e4SLinus Torvalds BUG(); 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */ 2361da177e4SLinus Torvalds if (c->nextblock && (c->nextblock->dirty_size)) { 2371da177e4SLinus Torvalds c->nextblock->wasted_size += c->nextblock->dirty_size; 2381da177e4SLinus Torvalds c->wasted_size += c->nextblock->dirty_size; 2391da177e4SLinus Torvalds c->dirty_size -= c->nextblock->dirty_size; 2401da177e4SLinus Torvalds c->nextblock->dirty_size = 0; 2411da177e4SLinus Torvalds } 2422f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 243e96fb230SDavid Woodhouse if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { 2441da177e4SLinus Torvalds /* If we're going to start writing into a block which already 2451da177e4SLinus Torvalds contains data, and the end of the data isn't page-aligned, 2461da177e4SLinus Torvalds skip a little and align it. */ 2471da177e4SLinus Torvalds 248daba5cc4SArtem B. Bityutskiy uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n", 2511da177e4SLinus Torvalds skip)); 252046b8b98SDavid Woodhouse jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); 253f560928bSDavid Woodhouse jffs2_scan_dirty_space(c, c->nextblock, skip); 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds #endif 2561da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 2571da177e4SLinus Torvalds if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { 2581da177e4SLinus Torvalds printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); 2591da177e4SLinus Torvalds printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks); 2601da177e4SLinus Torvalds ret = -EIO; 2611da177e4SLinus Torvalds goto out; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds ret = 0; 2661da177e4SLinus Torvalds out: 2671da177e4SLinus Torvalds if (buf_size) 2681da177e4SLinus Torvalds kfree(flashbuf); 2691da177e4SLinus Torvalds #ifndef __ECOS 2701da177e4SLinus Torvalds else 2711da177e4SLinus Torvalds c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size); 2721da177e4SLinus Torvalds #endif 2735b5ffbc1SFlorin Malita if (s) 2745b5ffbc1SFlorin Malita kfree(s); 2755b5ffbc1SFlorin Malita 2761da177e4SLinus Torvalds return ret; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 279c05d52c7SAdrian Bunk static int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf, 2801da177e4SLinus Torvalds uint32_t ofs, uint32_t len) 2811da177e4SLinus Torvalds { 2821da177e4SLinus Torvalds int ret; 2831da177e4SLinus Torvalds size_t retlen; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds ret = jffs2_flash_read(c, ofs, len, &retlen, buf); 2861da177e4SLinus Torvalds if (ret) { 2871da177e4SLinus Torvalds D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret)); 2881da177e4SLinus Torvalds return ret; 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds if (retlen < len) { 2911da177e4SLinus Torvalds D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen)); 2921da177e4SLinus Torvalds return -EIO; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds return 0; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 297e631ddbaSFerenc Havasi int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 298e631ddbaSFerenc Havasi { 299e631ddbaSFerenc Havasi if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size 30099988f7bSDavid Woodhouse && (!jeb->first_node || !ref_next(jeb->first_node)) ) 301e631ddbaSFerenc Havasi return BLK_STATE_CLEANMARKER; 302e631ddbaSFerenc Havasi 303e631ddbaSFerenc Havasi /* move blocks with max 4 byte dirty space to cleanlist */ 304e631ddbaSFerenc Havasi else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { 305e631ddbaSFerenc Havasi c->dirty_size -= jeb->dirty_size; 306e631ddbaSFerenc Havasi c->wasted_size += jeb->dirty_size; 307e631ddbaSFerenc Havasi jeb->wasted_size += jeb->dirty_size; 308e631ddbaSFerenc Havasi jeb->dirty_size = 0; 309e631ddbaSFerenc Havasi return BLK_STATE_CLEAN; 310e631ddbaSFerenc Havasi } else if (jeb->used_size || jeb->unchecked_size) 311e631ddbaSFerenc Havasi return BLK_STATE_PARTDIRTY; 312e631ddbaSFerenc Havasi else 313e631ddbaSFerenc Havasi return BLK_STATE_ALLDIRTY; 314e631ddbaSFerenc Havasi } 315e631ddbaSFerenc Havasi 316aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 317aa98d7cfSKaiGai Kohei static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 318aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr *rx, uint32_t ofs, 319aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 320aa98d7cfSKaiGai Kohei { 321aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 322c9f700f8SKaiGai Kohei uint32_t xid, version, totlen, crc; 32368270995SDavid Woodhouse int err; 324aa98d7cfSKaiGai Kohei 325aa98d7cfSKaiGai Kohei crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); 326aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx->node_crc)) { 327aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 328aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->node_crc), crc); 32968270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) 33068270995SDavid Woodhouse return err; 331aa98d7cfSKaiGai Kohei return 0; 332aa98d7cfSKaiGai Kohei } 333aa98d7cfSKaiGai Kohei 334c9f700f8SKaiGai Kohei xid = je32_to_cpu(rx->xid); 335c9f700f8SKaiGai Kohei version = je32_to_cpu(rx->version); 336c9f700f8SKaiGai Kohei 3378a13695cSKaiGai Kohei totlen = PAD(sizeof(struct jffs2_raw_xattr) 3388a13695cSKaiGai Kohei + rx->name_len + 1 + je16_to_cpu(rx->value_len)); 339aa98d7cfSKaiGai Kohei if (totlen != je32_to_cpu(rx->totlen)) { 340aa98d7cfSKaiGai Kohei JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", 341aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->totlen), totlen); 34268270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) 34368270995SDavid Woodhouse return err; 344aa98d7cfSKaiGai Kohei return 0; 345aa98d7cfSKaiGai Kohei } 346aa98d7cfSKaiGai Kohei 347c9f700f8SKaiGai Kohei xd = jffs2_setup_xattr_datum(c, xid, version); 348c9f700f8SKaiGai Kohei if (IS_ERR(xd)) 349aa98d7cfSKaiGai Kohei return PTR_ERR(xd); 350c9f700f8SKaiGai Kohei 351c9f700f8SKaiGai Kohei if (xd->version > version) { 352c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw 353c9f700f8SKaiGai Kohei = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL); 354c9f700f8SKaiGai Kohei raw->next_in_ino = xd->node->next_in_ino; 355c9f700f8SKaiGai Kohei xd->node->next_in_ino = raw; 356c9f700f8SKaiGai Kohei } else { 357c9f700f8SKaiGai Kohei xd->version = version; 358aa98d7cfSKaiGai Kohei xd->xprefix = rx->xprefix; 359aa98d7cfSKaiGai Kohei xd->name_len = rx->name_len; 360aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx->value_len); 361aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx->data_crc); 362aa98d7cfSKaiGai Kohei 363c9f700f8SKaiGai Kohei jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd); 364c9f700f8SKaiGai Kohei } 365f1f9671bSDavid Woodhouse 366aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 367aa98d7cfSKaiGai Kohei jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset); 368aa98d7cfSKaiGai Kohei dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n", 369aa98d7cfSKaiGai Kohei ofs, xd->xid, xd->version); 370aa98d7cfSKaiGai Kohei return 0; 371aa98d7cfSKaiGai Kohei } 372aa98d7cfSKaiGai Kohei 373aa98d7cfSKaiGai Kohei static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 374aa98d7cfSKaiGai Kohei struct jffs2_raw_xref *rr, uint32_t ofs, 375aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 376aa98d7cfSKaiGai Kohei { 377aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 378aa98d7cfSKaiGai Kohei uint32_t crc; 37968270995SDavid Woodhouse int err; 380aa98d7cfSKaiGai Kohei 381aa98d7cfSKaiGai Kohei crc = crc32(0, rr, sizeof(*rr) - 4); 382aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr->node_crc)) { 383aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 384aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->node_crc), crc); 38568270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) 38668270995SDavid Woodhouse return err; 387aa98d7cfSKaiGai Kohei return 0; 388aa98d7cfSKaiGai Kohei } 389aa98d7cfSKaiGai Kohei 390aa98d7cfSKaiGai Kohei if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { 39189291a9dSDavid Woodhouse JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n", 392aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->totlen), 393aa98d7cfSKaiGai Kohei PAD(sizeof(struct jffs2_raw_xref))); 39468270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) 39568270995SDavid Woodhouse return err; 396aa98d7cfSKaiGai Kohei return 0; 397aa98d7cfSKaiGai Kohei } 398aa98d7cfSKaiGai Kohei 399aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 400aa98d7cfSKaiGai Kohei if (!ref) 401aa98d7cfSKaiGai Kohei return -ENOMEM; 402aa98d7cfSKaiGai Kohei 403aa98d7cfSKaiGai Kohei /* BEFORE jffs2_build_xattr_subsystem() called, 404c9f700f8SKaiGai Kohei * and AFTER xattr_ref is marked as a dead xref, 405aa98d7cfSKaiGai Kohei * ref->xid is used to store 32bit xid, xd is not used 406aa98d7cfSKaiGai Kohei * ref->ino is used to store 32bit inode-number, ic is not used 407aa98d7cfSKaiGai Kohei * Thoes variables are declared as union, thus using those 4088f2b6f49SKaiGai Kohei * are exclusive. In a similar way, ref->next is temporarily 409aa98d7cfSKaiGai Kohei * used to chain all xattr_ref object. It's re-chained to 410aa98d7cfSKaiGai Kohei * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. 411aa98d7cfSKaiGai Kohei */ 412aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr->ino); 413aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr->xid); 414c9f700f8SKaiGai Kohei ref->xseqno = je32_to_cpu(rr->xseqno); 415c9f700f8SKaiGai Kohei if (ref->xseqno > c->highest_xseqno) 416c9f700f8SKaiGai Kohei c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 4178f2b6f49SKaiGai Kohei ref->next = c->xref_temp; 4188f2b6f49SKaiGai Kohei c->xref_temp = ref; 419aa98d7cfSKaiGai Kohei 420c9f700f8SKaiGai Kohei jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref); 421f1f9671bSDavid Woodhouse 422aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 423aa98d7cfSKaiGai Kohei jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); 424aa98d7cfSKaiGai Kohei dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", 425aa98d7cfSKaiGai Kohei ofs, ref->xid, ref->ino); 426aa98d7cfSKaiGai Kohei return 0; 427aa98d7cfSKaiGai Kohei } 428aa98d7cfSKaiGai Kohei #endif 429aa98d7cfSKaiGai Kohei 4309641b784SDavid Woodhouse /* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into 4319641b784SDavid Woodhouse the flash, XIP-style */ 4321da177e4SLinus Torvalds static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 433e631ddbaSFerenc Havasi unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { 4341da177e4SLinus Torvalds struct jffs2_unknown_node *node; 4351da177e4SLinus Torvalds struct jffs2_unknown_node crcnode; 4361da177e4SLinus Torvalds uint32_t ofs, prevofs; 4371da177e4SLinus Torvalds uint32_t hdr_crc, buf_ofs, buf_len; 4381da177e4SLinus Torvalds int err; 4391da177e4SLinus Torvalds int noise = 0; 440e631ddbaSFerenc Havasi 441e631ddbaSFerenc Havasi 4422f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4431da177e4SLinus Torvalds int cleanmarkerfound = 0; 4441da177e4SLinus Torvalds #endif 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds ofs = jeb->offset; 4471da177e4SLinus Torvalds prevofs = jeb->offset - 1; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs)); 4501da177e4SLinus Torvalds 4512f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4521da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 453a7a6ace1SArtem Bityutskiy int ret; 454a7a6ace1SArtem Bityutskiy 455a7a6ace1SArtem Bityutskiy if (c->mtd->block_isbad(c->mtd, jeb->offset)) 456a7a6ace1SArtem Bityutskiy return BLK_STATE_BADBLOCK; 457a7a6ace1SArtem Bityutskiy 458a7a6ace1SArtem Bityutskiy ret = jffs2_check_nand_cleanmarker(c, jeb); 4591da177e4SLinus Torvalds D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret)); 460a7a6ace1SArtem Bityutskiy 4611da177e4SLinus Torvalds /* Even if it's not found, we still scan to see 4621da177e4SLinus Torvalds if the block is empty. We use this information 4631da177e4SLinus Torvalds to decide whether to erase it or not. */ 4641da177e4SLinus Torvalds switch (ret) { 4651da177e4SLinus Torvalds case 0: cleanmarkerfound = 1; break; 4661da177e4SLinus Torvalds case 1: break; 4671da177e4SLinus Torvalds default: return ret; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds } 4701da177e4SLinus Torvalds #endif 471e631ddbaSFerenc Havasi 472e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 4739641b784SDavid Woodhouse struct jffs2_sum_marker *sm; 4749641b784SDavid Woodhouse void *sumptr = NULL; 4759641b784SDavid Woodhouse uint32_t sumlen; 476e631ddbaSFerenc Havasi 4779641b784SDavid Woodhouse if (!buf_size) { 4789641b784SDavid Woodhouse /* XIP case. Just look, point at the summary if it's there */ 47913ba42dfSDavid Woodhouse sm = (void *)buf + c->sector_size - sizeof(*sm); 480e631ddbaSFerenc Havasi if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 4819641b784SDavid Woodhouse sumptr = buf + je32_to_cpu(sm->offset); 4829641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 4839641b784SDavid Woodhouse } 4849641b784SDavid Woodhouse } else { 4859641b784SDavid Woodhouse /* If NAND flash, read a whole page of it. Else just the end */ 4869641b784SDavid Woodhouse if (c->wbuf_pagesize) 4879641b784SDavid Woodhouse buf_len = c->wbuf_pagesize; 4889641b784SDavid Woodhouse else 4899641b784SDavid Woodhouse buf_len = sizeof(*sm); 4909641b784SDavid Woodhouse 4919641b784SDavid Woodhouse /* Read as much as we want into the _end_ of the preallocated buffer */ 4929641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, 4939641b784SDavid Woodhouse jeb->offset + c->sector_size - buf_len, 4949641b784SDavid Woodhouse buf_len); 4959641b784SDavid Woodhouse if (err) 4969641b784SDavid Woodhouse return err; 4979641b784SDavid Woodhouse 4989641b784SDavid Woodhouse sm = (void *)buf + buf_size - sizeof(*sm); 4999641b784SDavid Woodhouse if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 5009641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 5019641b784SDavid Woodhouse sumptr = buf + buf_size - sumlen; 5029641b784SDavid Woodhouse 5039641b784SDavid Woodhouse /* Now, make sure the summary itself is available */ 5049641b784SDavid Woodhouse if (sumlen > buf_size) { 5059641b784SDavid Woodhouse /* Need to kmalloc for this. */ 5069641b784SDavid Woodhouse sumptr = kmalloc(sumlen, GFP_KERNEL); 5079641b784SDavid Woodhouse if (!sumptr) 5089641b784SDavid Woodhouse return -ENOMEM; 5099641b784SDavid Woodhouse memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); 5109641b784SDavid Woodhouse } 5119641b784SDavid Woodhouse if (buf_len < sumlen) { 5129641b784SDavid Woodhouse /* Need to read more so that the entire summary node is present */ 5139641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, sumptr, 5149641b784SDavid Woodhouse jeb->offset + c->sector_size - sumlen, 5159641b784SDavid Woodhouse sumlen - buf_len); 5169641b784SDavid Woodhouse if (err) 517e631ddbaSFerenc Havasi return err; 518e631ddbaSFerenc Havasi } 519e631ddbaSFerenc Havasi } 520e631ddbaSFerenc Havasi 5219641b784SDavid Woodhouse } 5229641b784SDavid Woodhouse 5239641b784SDavid Woodhouse if (sumptr) { 5249641b784SDavid Woodhouse err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); 5253560160aSDavid Woodhouse 5269641b784SDavid Woodhouse if (buf_size && sumlen > buf_size) 5279641b784SDavid Woodhouse kfree(sumptr); 5283560160aSDavid Woodhouse /* If it returns with a real error, bail. 5293560160aSDavid Woodhouse If it returns positive, that's a block classification 5303560160aSDavid Woodhouse (i.e. BLK_STATE_xxx) so return that too. 5313560160aSDavid Woodhouse If it returns zero, fall through to full scan. */ 5323560160aSDavid Woodhouse if (err) 5333560160aSDavid Woodhouse return err; 5349641b784SDavid Woodhouse } 535e631ddbaSFerenc Havasi } 536e631ddbaSFerenc Havasi 5371da177e4SLinus Torvalds buf_ofs = jeb->offset; 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds if (!buf_size) { 5409641b784SDavid Woodhouse /* This is the XIP case -- we're reading _directly_ from the flash chip */ 5411da177e4SLinus Torvalds buf_len = c->sector_size; 5421da177e4SLinus Torvalds } else { 5433be36675SAndrew Victor buf_len = EMPTY_SCAN_SIZE(c->sector_size); 5441da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); 5451da177e4SLinus Torvalds if (err) 5461da177e4SLinus Torvalds return err; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ 5501da177e4SLinus Torvalds ofs = 0; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds /* Scan only 4KiB of 0xFF before declaring it's empty */ 5533be36675SAndrew Victor while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) 5541da177e4SLinus Torvalds ofs += 4; 5551da177e4SLinus Torvalds 5563be36675SAndrew Victor if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) { 5572f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 5581da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 5591da177e4SLinus Torvalds /* scan oob, take care of cleanmarker */ 5601da177e4SLinus Torvalds int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); 5611da177e4SLinus Torvalds D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret)); 5621da177e4SLinus Torvalds switch (ret) { 5631da177e4SLinus Torvalds case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; 5641da177e4SLinus Torvalds case 1: return BLK_STATE_ALLDIRTY; 5651da177e4SLinus Torvalds default: return ret; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds } 5681da177e4SLinus Torvalds #endif 5691da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset)); 5708f15fd55SAndrew Victor if (c->cleanmarker_size == 0) 5718f15fd55SAndrew Victor return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ 5728f15fd55SAndrew Victor else 5731da177e4SLinus Torvalds return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds if (ofs) { 5761da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset, 5771da177e4SLinus Torvalds jeb->offset + ofs)); 578a6a8bef7SDavid Woodhouse if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1))) 579a6a8bef7SDavid Woodhouse return err; 58068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) 58168270995SDavid Woodhouse return err; 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds /* Now ofs is a complete physical flash offset as it always was... */ 5851da177e4SLinus Torvalds ofs += jeb->offset; 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds noise = 10; 5881da177e4SLinus Torvalds 589733802d9SArtem B. Bityutskiy dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); 590e631ddbaSFerenc Havasi 5911da177e4SLinus Torvalds scan_more: 5921da177e4SLinus Torvalds while(ofs < jeb->offset + c->sector_size) { 5931da177e4SLinus Torvalds 594e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 5951da177e4SLinus Torvalds 5962f785402SDavid Woodhouse /* Make sure there are node refs available for use */ 597046b8b98SDavid Woodhouse err = jffs2_prealloc_raw_node_refs(c, jeb, 2); 5982f785402SDavid Woodhouse if (err) 5992f785402SDavid Woodhouse return err; 6002f785402SDavid Woodhouse 6011da177e4SLinus Torvalds cond_resched(); 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds if (ofs & 3) { 6041da177e4SLinus Torvalds printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs); 6051da177e4SLinus Torvalds ofs = PAD(ofs); 6061da177e4SLinus Torvalds continue; 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds if (ofs == prevofs) { 6091da177e4SLinus Torvalds printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs); 61068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 61168270995SDavid Woodhouse return err; 6121da177e4SLinus Torvalds ofs += 4; 6131da177e4SLinus Torvalds continue; 6141da177e4SLinus Torvalds } 6151da177e4SLinus Torvalds prevofs = ofs; 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { 6181da177e4SLinus 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), 6191da177e4SLinus Torvalds jeb->offset, c->sector_size, ofs, sizeof(*node))); 62068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) 62168270995SDavid Woodhouse return err; 6221da177e4SLinus Torvalds break; 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(*node)) { 6261da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 6271da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", 6281da177e4SLinus Torvalds sizeof(struct jffs2_unknown_node), buf_len, ofs)); 6291da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 6301da177e4SLinus Torvalds if (err) 6311da177e4SLinus Torvalds return err; 6321da177e4SLinus Torvalds buf_ofs = ofs; 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { 6381da177e4SLinus Torvalds uint32_t inbuf_ofs; 639c2aecda7SJoakim Tjernlund uint32_t empty_start, scan_end; 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds empty_start = ofs; 6421da177e4SLinus Torvalds ofs += 4; 643c2aecda7SJoakim Tjernlund scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len); 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); 6461da177e4SLinus Torvalds more_empty: 6471da177e4SLinus Torvalds inbuf_ofs = ofs - buf_ofs; 648c2aecda7SJoakim Tjernlund while (inbuf_ofs < scan_end) { 649c2aecda7SJoakim Tjernlund if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) { 6501da177e4SLinus Torvalds printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", 6511da177e4SLinus Torvalds empty_start, ofs); 65268270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) 65368270995SDavid Woodhouse return err; 6541da177e4SLinus Torvalds goto scan_more; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds inbuf_ofs+=4; 6581da177e4SLinus Torvalds ofs += 4; 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds /* Ran off end. */ 6611da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs)); 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds /* If we're only checking the beginning of a block with a cleanmarker, 6641da177e4SLinus Torvalds bail now */ 6651da177e4SLinus Torvalds if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && 66699988f7bSDavid Woodhouse c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) { 6673be36675SAndrew Victor D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); 6681da177e4SLinus Torvalds return BLK_STATE_CLEANMARKER; 6691da177e4SLinus Torvalds } 670c2aecda7SJoakim Tjernlund if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */ 671c2aecda7SJoakim Tjernlund scan_end = buf_len; 672c2aecda7SJoakim Tjernlund goto more_empty; 673c2aecda7SJoakim Tjernlund } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* See how much more there is to read in this eraseblock... */ 6761da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 6771da177e4SLinus Torvalds if (!buf_len) { 6781da177e4SLinus Torvalds /* No more to read. Break out of main loop without marking 6791da177e4SLinus Torvalds this range of empty space as dirty (because it's not) */ 6801da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n", 6811da177e4SLinus Torvalds empty_start)); 6821da177e4SLinus Torvalds break; 6831da177e4SLinus Torvalds } 684c2aecda7SJoakim Tjernlund /* point never reaches here */ 685c2aecda7SJoakim Tjernlund scan_end = buf_len; 6861da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); 6871da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 6881da177e4SLinus Torvalds if (err) 6891da177e4SLinus Torvalds return err; 6901da177e4SLinus Torvalds buf_ofs = ofs; 6911da177e4SLinus Torvalds goto more_empty; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { 6951da177e4SLinus Torvalds printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs); 69668270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 69768270995SDavid Woodhouse return err; 6981da177e4SLinus Torvalds ofs += 4; 6991da177e4SLinus Torvalds continue; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { 7021da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs)); 70368270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 70468270995SDavid Woodhouse return err; 7051da177e4SLinus Torvalds ofs += 4; 7061da177e4SLinus Torvalds continue; 7071da177e4SLinus Torvalds } 7081da177e4SLinus Torvalds if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { 7091da177e4SLinus Torvalds printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs); 7101da177e4SLinus Torvalds printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n"); 71168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 71268270995SDavid Woodhouse return err; 7131da177e4SLinus Torvalds ofs += 4; 7141da177e4SLinus Torvalds continue; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { 7171da177e4SLinus Torvalds /* OK. We're out of possibilities. Whinge and move on */ 7181da177e4SLinus Torvalds noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", 7191da177e4SLinus Torvalds JFFS2_MAGIC_BITMASK, ofs, 7201da177e4SLinus Torvalds je16_to_cpu(node->magic)); 72168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 72268270995SDavid Woodhouse return err; 7231da177e4SLinus Torvalds ofs += 4; 7241da177e4SLinus Torvalds continue; 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds /* We seem to have a node of sorts. Check the CRC */ 7271da177e4SLinus Torvalds crcnode.magic = node->magic; 7281da177e4SLinus Torvalds crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); 7291da177e4SLinus Torvalds crcnode.totlen = node->totlen; 7301da177e4SLinus Torvalds hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds if (hdr_crc != je32_to_cpu(node->hdr_crc)) { 7331da177e4SLinus 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", 7341da177e4SLinus Torvalds ofs, je16_to_cpu(node->magic), 7351da177e4SLinus Torvalds je16_to_cpu(node->nodetype), 7361da177e4SLinus Torvalds je32_to_cpu(node->totlen), 7371da177e4SLinus Torvalds je32_to_cpu(node->hdr_crc), 7381da177e4SLinus Torvalds hdr_crc); 73968270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 74068270995SDavid Woodhouse return err; 7411da177e4SLinus Torvalds ofs += 4; 7421da177e4SLinus Torvalds continue; 7431da177e4SLinus Torvalds } 744c7258a44SDavid Woodhouse /* Due to poor choice of crc32 seed, an all-zero node will have a correct CRC */ 745c7258a44SDavid Woodhouse if (!je32_to_cpu(node->hdr_crc) && !je16_to_cpu(node->nodetype) && 746c7258a44SDavid Woodhouse !je16_to_cpu(node->magic) && !je32_to_cpu(node->totlen)) { 747c7258a44SDavid Woodhouse noisy_printk(&noise, "jffs2_scan_eraseblock(): All zero node header at 0x%08x.\n", ofs); 748c7258a44SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 749c7258a44SDavid Woodhouse return err; 750c7258a44SDavid Woodhouse ofs += 4; 751c7258a44SDavid Woodhouse continue; 752c7258a44SDavid Woodhouse } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds if (ofs + je32_to_cpu(node->totlen) > 7551da177e4SLinus Torvalds jeb->offset + c->sector_size) { 7561da177e4SLinus Torvalds /* Eep. Node goes over the end of the erase block. */ 7571da177e4SLinus Torvalds printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", 7581da177e4SLinus Torvalds ofs, je32_to_cpu(node->totlen)); 7591da177e4SLinus Torvalds printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n"); 76068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 76168270995SDavid Woodhouse return err; 7621da177e4SLinus Torvalds ofs += 4; 7631da177e4SLinus Torvalds continue; 7641da177e4SLinus Torvalds } 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { 7671da177e4SLinus Torvalds /* Wheee. This is an obsoleted node */ 7681da177e4SLinus Torvalds D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs)); 76968270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 77068270995SDavid Woodhouse return err; 7711da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 7721da177e4SLinus Torvalds continue; 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds switch(je16_to_cpu(node->nodetype)) { 7761da177e4SLinus Torvalds case JFFS2_NODETYPE_INODE: 7771da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { 7781da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 7791da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", 7801da177e4SLinus Torvalds sizeof(struct jffs2_raw_inode), buf_len, ofs)); 7811da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 7821da177e4SLinus Torvalds if (err) 7831da177e4SLinus Torvalds return err; 7841da177e4SLinus Torvalds buf_ofs = ofs; 7851da177e4SLinus Torvalds node = (void *)buf; 7861da177e4SLinus Torvalds } 787e631ddbaSFerenc Havasi err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); 7881da177e4SLinus Torvalds if (err) return err; 7891da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 7901da177e4SLinus Torvalds break; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds case JFFS2_NODETYPE_DIRENT: 7931da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 7941da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 7951da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", 7961da177e4SLinus Torvalds je32_to_cpu(node->totlen), buf_len, ofs)); 7971da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 7981da177e4SLinus Torvalds if (err) 7991da177e4SLinus Torvalds return err; 8001da177e4SLinus Torvalds buf_ofs = ofs; 8011da177e4SLinus Torvalds node = (void *)buf; 8021da177e4SLinus Torvalds } 803e631ddbaSFerenc Havasi err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); 8041da177e4SLinus Torvalds if (err) return err; 8051da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8061da177e4SLinus Torvalds break; 8071da177e4SLinus Torvalds 808aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 809aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XATTR: 810aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 811aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 812aa98d7cfSKaiGai Kohei D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)" 813aa98d7cfSKaiGai Kohei " left to end of buf. Reading 0x%x at 0x%08x\n", 814aa98d7cfSKaiGai Kohei je32_to_cpu(node->totlen), buf_len, ofs)); 815aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 816aa98d7cfSKaiGai Kohei if (err) 817aa98d7cfSKaiGai Kohei return err; 818aa98d7cfSKaiGai Kohei buf_ofs = ofs; 819aa98d7cfSKaiGai Kohei node = (void *)buf; 820aa98d7cfSKaiGai Kohei } 821aa98d7cfSKaiGai Kohei err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); 822aa98d7cfSKaiGai Kohei if (err) 823aa98d7cfSKaiGai Kohei return err; 824aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 825aa98d7cfSKaiGai Kohei break; 826aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XREF: 827aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 828aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 829aa98d7cfSKaiGai Kohei D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)" 830aa98d7cfSKaiGai Kohei " left to end of buf. Reading 0x%x at 0x%08x\n", 831aa98d7cfSKaiGai Kohei je32_to_cpu(node->totlen), buf_len, ofs)); 832aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 833aa98d7cfSKaiGai Kohei if (err) 834aa98d7cfSKaiGai Kohei return err; 835aa98d7cfSKaiGai Kohei buf_ofs = ofs; 836aa98d7cfSKaiGai Kohei node = (void *)buf; 837aa98d7cfSKaiGai Kohei } 838aa98d7cfSKaiGai Kohei err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); 839aa98d7cfSKaiGai Kohei if (err) 840aa98d7cfSKaiGai Kohei return err; 841aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 842aa98d7cfSKaiGai Kohei break; 843aa98d7cfSKaiGai Kohei #endif /* CONFIG_JFFS2_FS_XATTR */ 844aa98d7cfSKaiGai Kohei 8451da177e4SLinus Torvalds case JFFS2_NODETYPE_CLEANMARKER: 8461da177e4SLinus Torvalds D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs)); 8471da177e4SLinus Torvalds if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { 8481da177e4SLinus Torvalds printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", 8491da177e4SLinus Torvalds ofs, je32_to_cpu(node->totlen), c->cleanmarker_size); 85068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) 85168270995SDavid Woodhouse return err; 8521da177e4SLinus Torvalds ofs += PAD(sizeof(struct jffs2_unknown_node)); 8531da177e4SLinus Torvalds } else if (jeb->first_node) { 8541da177e4SLinus Torvalds printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset); 85568270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) 85668270995SDavid Woodhouse return err; 8571da177e4SLinus Torvalds ofs += PAD(sizeof(struct jffs2_unknown_node)); 8581da177e4SLinus Torvalds } else { 8592f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL); 860f1f9671bSDavid Woodhouse 8611da177e4SLinus Torvalds ofs += PAD(c->cleanmarker_size); 8621da177e4SLinus Torvalds } 8631da177e4SLinus Torvalds break; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds case JFFS2_NODETYPE_PADDING: 866e631ddbaSFerenc Havasi if (jffs2_sum_active()) 867e631ddbaSFerenc Havasi jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); 86868270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 86968270995SDavid Woodhouse return err; 8701da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8711da177e4SLinus Torvalds break; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds default: 8741da177e4SLinus Torvalds switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { 8751da177e4SLinus Torvalds case JFFS2_FEATURE_ROCOMPAT: 8761da177e4SLinus Torvalds printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); 8771da177e4SLinus Torvalds c->flags |= JFFS2_SB_FLAG_RO; 8781da177e4SLinus Torvalds if (!(jffs2_is_readonly(c))) 8791da177e4SLinus Torvalds return -EROFS; 88068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 88168270995SDavid Woodhouse return err; 8821da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8831da177e4SLinus Torvalds break; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds case JFFS2_FEATURE_INCOMPAT: 8861da177e4SLinus Torvalds printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs); 8871da177e4SLinus Torvalds return -EINVAL; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds case JFFS2_FEATURE_RWCOMPAT_DELETE: 8901da177e4SLinus Torvalds D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); 89168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 89268270995SDavid Woodhouse return err; 8931da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8941da177e4SLinus Torvalds break; 8951da177e4SLinus Torvalds 8966171586aSDavid Woodhouse case JFFS2_FEATURE_RWCOMPAT_COPY: { 8971da177e4SLinus Torvalds D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs)); 8986171586aSDavid Woodhouse 8992f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL); 9006171586aSDavid Woodhouse 9016171586aSDavid Woodhouse /* We can't summarise nodes we don't grok */ 9026171586aSDavid Woodhouse jffs2_sum_disable_collecting(s); 9031da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 9041da177e4SLinus Torvalds break; 9051da177e4SLinus Torvalds } 9061da177e4SLinus Torvalds } 9071da177e4SLinus Torvalds } 9086171586aSDavid Woodhouse } 9091da177e4SLinus Torvalds 910e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 911e631ddbaSFerenc Havasi if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { 912733802d9SArtem B. Bityutskiy dbg_summary("There is not enough space for " 913e631ddbaSFerenc Havasi "summary information, disabling for this jeb!\n"); 914e631ddbaSFerenc Havasi jffs2_sum_disable_collecting(s); 915e631ddbaSFerenc Havasi } 916e631ddbaSFerenc Havasi } 9171da177e4SLinus Torvalds 9188b9e9fe8SDavid Woodhouse D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n", 9198b9e9fe8SDavid Woodhouse jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size)); 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds /* mark_node_obsolete can add to wasted !! */ 9221da177e4SLinus Torvalds if (jeb->wasted_size) { 9231da177e4SLinus Torvalds jeb->dirty_size += jeb->wasted_size; 9241da177e4SLinus Torvalds c->dirty_size += jeb->wasted_size; 9251da177e4SLinus Torvalds c->wasted_size -= jeb->wasted_size; 9261da177e4SLinus Torvalds jeb->wasted_size = 0; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds 929e631ddbaSFerenc Havasi return jffs2_scan_classify_jeb(c, jeb); 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 932e631ddbaSFerenc Havasi struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) 9331da177e4SLinus Torvalds { 9341da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 9371da177e4SLinus Torvalds if (ic) 9381da177e4SLinus Torvalds return ic; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds if (ino > c->highest_ino) 9411da177e4SLinus Torvalds c->highest_ino = ino; 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds ic = jffs2_alloc_inode_cache(); 9441da177e4SLinus Torvalds if (!ic) { 9451da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n"); 9461da177e4SLinus Torvalds return NULL; 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds memset(ic, 0, sizeof(*ic)); 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds ic->ino = ino; 9511da177e4SLinus Torvalds ic->nodes = (void *)ic; 9521da177e4SLinus Torvalds jffs2_add_ino_cache(c, ic); 9531da177e4SLinus Torvalds if (ino == 1) 9541da177e4SLinus Torvalds ic->nlink = 1; 9551da177e4SLinus Torvalds return ic; 9561da177e4SLinus Torvalds } 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 959e631ddbaSFerenc Havasi struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) 9601da177e4SLinus Torvalds { 9611da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 96253043002SThomas Gleixner uint32_t crc, ino = je32_to_cpu(ri->ino); 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /* We do very little here now. Just check the ino# to which we should attribute 9671da177e4SLinus Torvalds this node; we can do all the CRC checking etc. later. There's a tradeoff here -- 9681da177e4SLinus Torvalds we used to scan the flash once only, reading everything we want from it into 9691da177e4SLinus Torvalds memory, then building all our in-core data structures and freeing the extra 9701da177e4SLinus Torvalds information. Now we allow the first part of the mount to complete a lot quicker, 9711da177e4SLinus Torvalds but we have to go _back_ to the flash in order to finish the CRC checking, etc. 9721da177e4SLinus Torvalds Which means that the _full_ amount of time to get to proper write mode with GC 9731da177e4SLinus Torvalds operational may actually be _longer_ than before. Sucks to be me. */ 9741da177e4SLinus Torvalds 97553043002SThomas Gleixner /* Check the node CRC in any case. */ 97653043002SThomas Gleixner crc = crc32(0, ri, sizeof(*ri)-8); 97753043002SThomas Gleixner if (crc != je32_to_cpu(ri->node_crc)) { 97853043002SThomas Gleixner printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on " 97953043002SThomas Gleixner "node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 98053043002SThomas Gleixner ofs, je32_to_cpu(ri->node_crc), crc); 98153043002SThomas Gleixner /* 98253043002SThomas Gleixner * We believe totlen because the CRC on the node 98353043002SThomas Gleixner * _header_ was OK, just the node itself failed. 98453043002SThomas Gleixner */ 98553043002SThomas Gleixner return jffs2_scan_dirty_space(c, jeb, 98653043002SThomas Gleixner PAD(je32_to_cpu(ri->totlen))); 98753043002SThomas Gleixner } 98853043002SThomas Gleixner 9891da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 9901da177e4SLinus Torvalds if (!ic) { 9911da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, ino); 9922f785402SDavid Woodhouse if (!ic) 9931da177e4SLinus Torvalds return -ENOMEM; 9941da177e4SLinus Torvalds } 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds /* Wheee. It worked */ 9972f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic); 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n", 10001da177e4SLinus Torvalds je32_to_cpu(ri->ino), je32_to_cpu(ri->version), 10011da177e4SLinus Torvalds je32_to_cpu(ri->offset), 10021da177e4SLinus Torvalds je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize))); 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds pseudo_random += je32_to_cpu(ri->version); 10051da177e4SLinus Torvalds 1006e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1007e631ddbaSFerenc Havasi jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); 1008e631ddbaSFerenc Havasi } 1009e631ddbaSFerenc Havasi 10101da177e4SLinus Torvalds return 0; 10111da177e4SLinus Torvalds } 10121da177e4SLinus Torvalds 10131da177e4SLinus Torvalds static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 1014e631ddbaSFerenc Havasi struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) 10151da177e4SLinus Torvalds { 10161da177e4SLinus Torvalds struct jffs2_full_dirent *fd; 10171da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 10181da177e4SLinus Torvalds uint32_t crc; 101968270995SDavid Woodhouse int err; 10201da177e4SLinus Torvalds 10211da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs)); 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds /* We don't get here unless the node is still valid, so we don't have to 10241da177e4SLinus Torvalds mask in the ACCURATE bit any more. */ 10251da177e4SLinus Torvalds crc = crc32(0, rd, sizeof(*rd)-8); 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->node_crc)) { 10281da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 10291da177e4SLinus Torvalds ofs, je32_to_cpu(rd->node_crc), crc); 10301da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ 103168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) 103268270995SDavid Woodhouse return err; 10331da177e4SLinus Torvalds return 0; 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds pseudo_random += je32_to_cpu(rd->version); 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds fd = jffs2_alloc_full_dirent(rd->nsize+1); 10391da177e4SLinus Torvalds if (!fd) { 10401da177e4SLinus Torvalds return -ENOMEM; 10411da177e4SLinus Torvalds } 10421da177e4SLinus Torvalds memcpy(&fd->name, rd->name, rd->nsize); 10431da177e4SLinus Torvalds fd->name[rd->nsize] = 0; 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds crc = crc32(0, fd->name, rd->nsize); 10461da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->name_crc)) { 10471da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 10481da177e4SLinus Torvalds ofs, je32_to_cpu(rd->name_crc), crc); 10491da177e4SLinus Torvalds D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino))); 10501da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10511da177e4SLinus Torvalds /* FIXME: Why do we believe totlen? */ 10521da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ 105368270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) 105468270995SDavid Woodhouse return err; 10551da177e4SLinus Torvalds return 0; 10561da177e4SLinus Torvalds } 10571da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); 10581da177e4SLinus Torvalds if (!ic) { 10591da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10601da177e4SLinus Torvalds return -ENOMEM; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10632f785402SDavid Woodhouse fd->raw = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rd->totlen)), ic); 10641da177e4SLinus Torvalds 10651da177e4SLinus Torvalds fd->next = NULL; 10661da177e4SLinus Torvalds fd->version = je32_to_cpu(rd->version); 10671da177e4SLinus Torvalds fd->ino = je32_to_cpu(rd->ino); 10681da177e4SLinus Torvalds fd->nhash = full_name_hash(fd->name, rd->nsize); 10691da177e4SLinus Torvalds fd->type = rd->type; 10701da177e4SLinus Torvalds jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 10711da177e4SLinus Torvalds 1072e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1073e631ddbaSFerenc Havasi jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); 1074e631ddbaSFerenc Havasi } 1075e631ddbaSFerenc Havasi 10761da177e4SLinus Torvalds return 0; 10771da177e4SLinus Torvalds } 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds static int count_list(struct list_head *l) 10801da177e4SLinus Torvalds { 10811da177e4SLinus Torvalds uint32_t count = 0; 10821da177e4SLinus Torvalds struct list_head *tmp; 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds list_for_each(tmp, l) { 10851da177e4SLinus Torvalds count++; 10861da177e4SLinus Torvalds } 10871da177e4SLinus Torvalds return count; 10881da177e4SLinus Torvalds } 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds /* Note: This breaks if list_empty(head). I don't care. You 10911da177e4SLinus Torvalds might, if you copy this code and use it elsewhere :) */ 10921da177e4SLinus Torvalds static void rotate_list(struct list_head *head, uint32_t count) 10931da177e4SLinus Torvalds { 10941da177e4SLinus Torvalds struct list_head *n = head->next; 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds list_del(head); 10971da177e4SLinus Torvalds while(count--) { 10981da177e4SLinus Torvalds n = n->next; 10991da177e4SLinus Torvalds } 11001da177e4SLinus Torvalds list_add(head, n); 11011da177e4SLinus Torvalds } 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds void jffs2_rotate_lists(struct jffs2_sb_info *c) 11041da177e4SLinus Torvalds { 11051da177e4SLinus Torvalds uint32_t x; 11061da177e4SLinus Torvalds uint32_t rotateby; 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds x = count_list(&c->clean_list); 11091da177e4SLinus Torvalds if (x) { 11101da177e4SLinus Torvalds rotateby = pseudo_random % x; 11111da177e4SLinus Torvalds rotate_list((&c->clean_list), rotateby); 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds x = count_list(&c->very_dirty_list); 11151da177e4SLinus Torvalds if (x) { 11161da177e4SLinus Torvalds rotateby = pseudo_random % x; 11171da177e4SLinus Torvalds rotate_list((&c->very_dirty_list), rotateby); 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds x = count_list(&c->dirty_list); 11211da177e4SLinus Torvalds if (x) { 11221da177e4SLinus Torvalds rotateby = pseudo_random % x; 11231da177e4SLinus Torvalds rotate_list((&c->dirty_list), rotateby); 11241da177e4SLinus Torvalds } 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds x = count_list(&c->erasable_list); 11271da177e4SLinus Torvalds if (x) { 11281da177e4SLinus Torvalds rotateby = pseudo_random % x; 11291da177e4SLinus Torvalds rotate_list((&c->erasable_list), rotateby); 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 11331da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_erasing_blocks; 11341da177e4SLinus Torvalds rotate_list((&c->erase_pending_list), rotateby); 11351da177e4SLinus Torvalds } 11361da177e4SLinus Torvalds 11371da177e4SLinus Torvalds if (c->nr_free_blocks) { 11381da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_free_blocks; 11391da177e4SLinus Torvalds rotate_list((&c->free_list), rotateby); 11401da177e4SLinus Torvalds } 11411da177e4SLinus Torvalds } 1142