11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 4c00c310eSDavid Woodhouse * Copyright © 2001-2007 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 * 101da177e4SLinus Torvalds */ 11c00c310eSDavid Woodhouse 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/sched.h> 141da177e4SLinus Torvalds #include <linux/slab.h> 151da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 161da177e4SLinus Torvalds #include <linux/pagemap.h> 171da177e4SLinus Torvalds #include <linux/crc32.h> 181da177e4SLinus Torvalds #include <linux/compiler.h> 191da177e4SLinus Torvalds #include "nodelist.h" 20e631ddbaSFerenc Havasi #include "summary.h" 21e631ddbaSFerenc Havasi #include "debug.h" 221da177e4SLinus Torvalds 2341bdc602SJoakim Tjernlund #define DEFAULT_EMPTY_SCAN_SIZE 256 241da177e4SLinus Torvalds 25da320f05SJoe Perches #define noisy_printk(noise, fmt, ...) \ 26da320f05SJoe Perches do { \ 271da177e4SLinus Torvalds if (*(noise)) { \ 28da320f05SJoe Perches pr_notice(fmt, ##__VA_ARGS__); \ 291da177e4SLinus Torvalds (*(noise))--; \ 30da320f05SJoe Perches if (!(*(noise))) \ 31da320f05SJoe Perches pr_notice("Further such events for this erase block will not be printed\n"); \ 321da177e4SLinus Torvalds } \ 331da177e4SLinus Torvalds } while (0) 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds static uint32_t pseudo_random; 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 38e631ddbaSFerenc Havasi unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s); 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds /* These helper functions _must_ increase ofs and also do the dirty/used space accounting. 411da177e4SLinus Torvalds * Returning an error will abort the mount - bad checksums etc. should just mark the space 421da177e4SLinus Torvalds * as dirty. 431da177e4SLinus Torvalds */ 441da177e4SLinus Torvalds static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 45e631ddbaSFerenc Havasi struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s); 461da177e4SLinus Torvalds static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 47e631ddbaSFerenc Havasi struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s); 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds static inline int min_free(struct jffs2_sb_info *c) 501da177e4SLinus Torvalds { 511da177e4SLinus Torvalds uint32_t min = 2 * sizeof(struct jffs2_raw_inode); 522f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 531da177e4SLinus Torvalds if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize) 541da177e4SLinus Torvalds return c->wbuf_pagesize; 551da177e4SLinus Torvalds #endif 561da177e4SLinus Torvalds return min; 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds } 593be36675SAndrew Victor 603be36675SAndrew Victor static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) { 613be36675SAndrew Victor if (sector_size < DEFAULT_EMPTY_SCAN_SIZE) 623be36675SAndrew Victor return sector_size; 633be36675SAndrew Victor else 643be36675SAndrew Victor return DEFAULT_EMPTY_SCAN_SIZE; 653be36675SAndrew Victor } 663be36675SAndrew Victor 6725090a6bSDavid Woodhouse static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 6825090a6bSDavid Woodhouse { 69a6a8bef7SDavid Woodhouse int ret; 70a6a8bef7SDavid Woodhouse 71a6a8bef7SDavid Woodhouse if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1))) 72a6a8bef7SDavid Woodhouse return ret; 73a6a8bef7SDavid Woodhouse if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size))) 7425090a6bSDavid Woodhouse return ret; 7525090a6bSDavid Woodhouse /* Turned wasted size into dirty, since we apparently 7625090a6bSDavid Woodhouse think it's recoverable now. */ 7725090a6bSDavid Woodhouse jeb->dirty_size += jeb->wasted_size; 7825090a6bSDavid Woodhouse c->dirty_size += jeb->wasted_size; 7925090a6bSDavid Woodhouse c->wasted_size -= jeb->wasted_size; 8025090a6bSDavid Woodhouse jeb->wasted_size = 0; 8125090a6bSDavid Woodhouse if (VERYDIRTY(c, jeb->dirty_size)) { 8225090a6bSDavid Woodhouse list_add(&jeb->list, &c->very_dirty_list); 8325090a6bSDavid Woodhouse } else { 8425090a6bSDavid Woodhouse list_add(&jeb->list, &c->dirty_list); 8525090a6bSDavid Woodhouse } 8625090a6bSDavid Woodhouse return 0; 8725090a6bSDavid Woodhouse } 8825090a6bSDavid Woodhouse 891da177e4SLinus Torvalds int jffs2_scan_medium(struct jffs2_sb_info *c) 901da177e4SLinus Torvalds { 911da177e4SLinus Torvalds int i, ret; 921da177e4SLinus Torvalds uint32_t empty_blocks = 0, bad_blocks = 0; 931da177e4SLinus Torvalds unsigned char *flashbuf = NULL; 941da177e4SLinus Torvalds uint32_t buf_size = 0; 95e631ddbaSFerenc Havasi struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ 961da177e4SLinus Torvalds #ifndef __ECOS 971ddd0d9aSGrant Erickson size_t pointlen, try_size; 981da177e4SLinus Torvalds 99d35ea200SArtem Bityutskiy ret = mtd_point(c->mtd, 0, c->mtd->size, &pointlen, 100a98889f3SJared Hulbert (void **)&flashbuf, NULL); 1011da177e4SLinus Torvalds if (!ret && pointlen < c->mtd->size) { 1021da177e4SLinus Torvalds /* Don't muck about if it won't let us point to the whole flash */ 1039c261b33SJoe Perches jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n", 1049c261b33SJoe Perches pointlen); 1057219778aSArtem Bityutskiy mtd_unpoint(c->mtd, 0, pointlen); 1061da177e4SLinus Torvalds flashbuf = NULL; 1071da177e4SLinus Torvalds } 10810934478SArtem Bityutskiy if (ret && ret != -EOPNOTSUPP) 1099c261b33SJoe Perches jffs2_dbg(1, "MTD point failed %d\n", ret); 1101da177e4SLinus Torvalds #endif 1111da177e4SLinus Torvalds if (!flashbuf) { 1121da177e4SLinus Torvalds /* For NAND it's quicker to read a whole eraseblock at a time, 1131da177e4SLinus Torvalds apparently */ 1141da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 1151ddd0d9aSGrant Erickson try_size = c->sector_size; 1161da177e4SLinus Torvalds else 1171ddd0d9aSGrant Erickson try_size = PAGE_SIZE; 1181da177e4SLinus Torvalds 1199c261b33SJoe Perches jffs2_dbg(1, "Trying to allocate readbuf of %zu " 1209c261b33SJoe Perches "bytes\n", try_size); 1211da177e4SLinus Torvalds 1221ddd0d9aSGrant Erickson flashbuf = mtd_kmalloc_up_to(c->mtd, &try_size); 1231da177e4SLinus Torvalds if (!flashbuf) 1241da177e4SLinus Torvalds return -ENOMEM; 1251ddd0d9aSGrant Erickson 1269c261b33SJoe Perches jffs2_dbg(1, "Allocated readbuf of %zu bytes\n", 1279c261b33SJoe Perches try_size); 1281ddd0d9aSGrant Erickson 1291ddd0d9aSGrant Erickson buf_size = (uint32_t)try_size; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 132e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1333d375d9eSYan Burman s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 134e631ddbaSFerenc Havasi if (!s) { 135e631ddbaSFerenc Havasi JFFS2_WARNING("Can't allocate memory for summary\n"); 13648396413SDavid Woodhouse ret = -ENOMEM; 13748396413SDavid Woodhouse goto out; 138e631ddbaSFerenc Havasi } 139e631ddbaSFerenc Havasi } 140e631ddbaSFerenc Havasi 1411da177e4SLinus Torvalds for (i=0; i<c->nr_blocks; i++) { 1421da177e4SLinus Torvalds struct jffs2_eraseblock *jeb = &c->blocks[i]; 1431da177e4SLinus Torvalds 144a2166b93SArtem Bityutskiy cond_resched(); 145a2166b93SArtem Bityutskiy 146e631ddbaSFerenc Havasi /* reset summary info for next eraseblock scan */ 147e631ddbaSFerenc Havasi jffs2_sum_reset_collected(s); 148e631ddbaSFerenc Havasi 149e631ddbaSFerenc Havasi ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), 150e631ddbaSFerenc Havasi buf_size, s); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds if (ret < 0) 1531da177e4SLinus Torvalds goto out; 1541da177e4SLinus Torvalds 155e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* Now decide which list to put it on */ 1581da177e4SLinus Torvalds switch(ret) { 1591da177e4SLinus Torvalds case BLK_STATE_ALLFF: 1601da177e4SLinus Torvalds /* 1611da177e4SLinus Torvalds * Empty block. Since we can't be sure it 1621da177e4SLinus Torvalds * was entirely erased, we just queue it for erase 1631da177e4SLinus Torvalds * again. It will be marked as such when the erase 1641da177e4SLinus Torvalds * is complete. Meanwhile we still count it as empty 1651da177e4SLinus Torvalds * for later checks. 1661da177e4SLinus Torvalds */ 1671da177e4SLinus Torvalds empty_blocks++; 1681da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1691da177e4SLinus Torvalds c->nr_erasing_blocks++; 1701da177e4SLinus Torvalds break; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds case BLK_STATE_CLEANMARKER: 1731da177e4SLinus Torvalds /* Only a CLEANMARKER node is valid */ 1741da177e4SLinus Torvalds if (!jeb->dirty_size) { 1751da177e4SLinus Torvalds /* It's actually free */ 1761da177e4SLinus Torvalds list_add(&jeb->list, &c->free_list); 1771da177e4SLinus Torvalds c->nr_free_blocks++; 1781da177e4SLinus Torvalds } else { 1791da177e4SLinus Torvalds /* Dirt */ 1809c261b33SJoe Perches jffs2_dbg(1, "Adding all-dirty block at 0x%08x to erase_pending_list\n", 1819c261b33SJoe Perches jeb->offset); 1821da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1831da177e4SLinus Torvalds c->nr_erasing_blocks++; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds break; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds case BLK_STATE_CLEAN: 1881da177e4SLinus Torvalds /* Full (or almost full) of clean data. Clean list */ 1891da177e4SLinus Torvalds list_add(&jeb->list, &c->clean_list); 1901da177e4SLinus Torvalds break; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds case BLK_STATE_PARTDIRTY: 1931da177e4SLinus Torvalds /* Some data, but not full. Dirty list. */ 1941da177e4SLinus Torvalds /* We want to remember the block with most free space 1951da177e4SLinus Torvalds and stick it in the 'nextblock' position to start writing to it. */ 1961da177e4SLinus Torvalds if (jeb->free_size > min_free(c) && 1971da177e4SLinus Torvalds (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { 1981da177e4SLinus Torvalds /* Better candidate for the next writes to go to */ 1991da177e4SLinus Torvalds if (c->nextblock) { 20025090a6bSDavid Woodhouse ret = file_dirty(c, c->nextblock); 20125090a6bSDavid Woodhouse if (ret) 202a2ab0ce0SChristian Engelmayer goto out; 203e631ddbaSFerenc Havasi /* deleting summary information of the old nextblock */ 204e631ddbaSFerenc Havasi jffs2_sum_reset_collected(c->summary); 2051da177e4SLinus Torvalds } 20625090a6bSDavid Woodhouse /* update collected summary information for the current nextblock */ 207e631ddbaSFerenc Havasi jffs2_sum_move_collected(c, s); 2089c261b33SJoe Perches jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n", 2099c261b33SJoe Perches __func__, jeb->offset); 2101da177e4SLinus Torvalds c->nextblock = jeb; 2111da177e4SLinus Torvalds } else { 21225090a6bSDavid Woodhouse ret = file_dirty(c, jeb); 21325090a6bSDavid Woodhouse if (ret) 214a2ab0ce0SChristian Engelmayer goto out; 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds break; 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds case BLK_STATE_ALLDIRTY: 2191da177e4SLinus Torvalds /* Nothing valid - not even a clean marker. Needs erasing. */ 2201da177e4SLinus Torvalds /* For now we just put it on the erasing list. We'll start the erases later */ 2219c261b33SJoe Perches jffs2_dbg(1, "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", 2229c261b33SJoe Perches jeb->offset); 2231da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 2241da177e4SLinus Torvalds c->nr_erasing_blocks++; 2251da177e4SLinus Torvalds break; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds case BLK_STATE_BADBLOCK: 2289c261b33SJoe Perches jffs2_dbg(1, "JFFS2: Block at 0x%08x is bad\n", 2299c261b33SJoe Perches jeb->offset); 2301da177e4SLinus Torvalds list_add(&jeb->list, &c->bad_list); 2311da177e4SLinus Torvalds c->bad_size += c->sector_size; 2321da177e4SLinus Torvalds c->free_size -= c->sector_size; 2331da177e4SLinus Torvalds bad_blocks++; 2341da177e4SLinus Torvalds break; 2351da177e4SLinus Torvalds default: 236da320f05SJoe Perches pr_warn("%s(): unknown block state\n", __func__); 2371da177e4SLinus Torvalds BUG(); 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */ 2421da177e4SLinus Torvalds if (c->nextblock && (c->nextblock->dirty_size)) { 2431da177e4SLinus Torvalds c->nextblock->wasted_size += c->nextblock->dirty_size; 2441da177e4SLinus Torvalds c->wasted_size += c->nextblock->dirty_size; 2451da177e4SLinus Torvalds c->dirty_size -= c->nextblock->dirty_size; 2461da177e4SLinus Torvalds c->nextblock->dirty_size = 0; 2471da177e4SLinus Torvalds } 2482f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 249e96fb230SDavid Woodhouse if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { 2501da177e4SLinus Torvalds /* If we're going to start writing into a block which already 2511da177e4SLinus Torvalds contains data, and the end of the data isn't page-aligned, 2521da177e4SLinus Torvalds skip a little and align it. */ 2531da177e4SLinus Torvalds 254daba5cc4SArtem B. Bityutskiy uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; 2551da177e4SLinus Torvalds 2569c261b33SJoe Perches jffs2_dbg(1, "%s(): Skipping %d bytes in nextblock to ensure page alignment\n", 2579c261b33SJoe Perches __func__, skip); 258046b8b98SDavid Woodhouse jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); 259f560928bSDavid Woodhouse jffs2_scan_dirty_space(c, c->nextblock, skip); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds #endif 2621da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 2631da177e4SLinus Torvalds if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { 264da320f05SJoe Perches pr_notice("Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); 265da320f05SJoe Perches pr_notice("empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n", 266da320f05SJoe Perches empty_blocks, bad_blocks, c->nr_blocks); 2671da177e4SLinus Torvalds ret = -EIO; 2681da177e4SLinus Torvalds goto out; 2691da177e4SLinus Torvalds } 270ae3b6ba0SDavid Woodhouse spin_lock(&c->erase_completion_lock); 271ae3b6ba0SDavid Woodhouse jffs2_garbage_collect_trigger(c); 272ae3b6ba0SDavid Woodhouse spin_unlock(&c->erase_completion_lock); 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds ret = 0; 2751da177e4SLinus Torvalds out: 2761da177e4SLinus Torvalds if (buf_size) 2771da177e4SLinus Torvalds kfree(flashbuf); 2781da177e4SLinus Torvalds #ifndef __ECOS 2791da177e4SLinus Torvalds else 2807219778aSArtem Bityutskiy mtd_unpoint(c->mtd, 0, c->mtd->size); 2811da177e4SLinus Torvalds #endif 2825b5ffbc1SFlorin Malita kfree(s); 2831da177e4SLinus Torvalds return ret; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 286c05d52c7SAdrian Bunk static int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf, 2871da177e4SLinus Torvalds uint32_t ofs, uint32_t len) 2881da177e4SLinus Torvalds { 2891da177e4SLinus Torvalds int ret; 2901da177e4SLinus Torvalds size_t retlen; 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds ret = jffs2_flash_read(c, ofs, len, &retlen, buf); 2931da177e4SLinus Torvalds if (ret) { 2949c261b33SJoe Perches jffs2_dbg(1, "mtd->read(0x%x bytes from 0x%x) returned %d\n", 2959c261b33SJoe Perches len, ofs, ret); 2961da177e4SLinus Torvalds return ret; 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds if (retlen < len) { 2999c261b33SJoe Perches jffs2_dbg(1, "Read at 0x%x gave only 0x%zx bytes\n", 3009c261b33SJoe Perches ofs, retlen); 3011da177e4SLinus Torvalds return -EIO; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds return 0; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 306e631ddbaSFerenc Havasi int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 307e631ddbaSFerenc Havasi { 308e631ddbaSFerenc Havasi if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size 30999988f7bSDavid Woodhouse && (!jeb->first_node || !ref_next(jeb->first_node)) ) 310e631ddbaSFerenc Havasi return BLK_STATE_CLEANMARKER; 311e631ddbaSFerenc Havasi 312e631ddbaSFerenc Havasi /* move blocks with max 4 byte dirty space to cleanlist */ 313e631ddbaSFerenc Havasi else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { 314e631ddbaSFerenc Havasi c->dirty_size -= jeb->dirty_size; 315e631ddbaSFerenc Havasi c->wasted_size += jeb->dirty_size; 316e631ddbaSFerenc Havasi jeb->wasted_size += jeb->dirty_size; 317e631ddbaSFerenc Havasi jeb->dirty_size = 0; 318e631ddbaSFerenc Havasi return BLK_STATE_CLEAN; 319e631ddbaSFerenc Havasi } else if (jeb->used_size || jeb->unchecked_size) 320e631ddbaSFerenc Havasi return BLK_STATE_PARTDIRTY; 321e631ddbaSFerenc Havasi else 322e631ddbaSFerenc Havasi return BLK_STATE_ALLDIRTY; 323e631ddbaSFerenc Havasi } 324e631ddbaSFerenc Havasi 325aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 326aa98d7cfSKaiGai Kohei static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 327aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr *rx, uint32_t ofs, 328aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 329aa98d7cfSKaiGai Kohei { 330aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 331c9f700f8SKaiGai Kohei uint32_t xid, version, totlen, crc; 33268270995SDavid Woodhouse int err; 333aa98d7cfSKaiGai Kohei 334aa98d7cfSKaiGai Kohei crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); 335aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx->node_crc)) { 336aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 337aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->node_crc), crc); 33868270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) 33968270995SDavid Woodhouse return err; 340aa98d7cfSKaiGai Kohei return 0; 341aa98d7cfSKaiGai Kohei } 342aa98d7cfSKaiGai Kohei 343c9f700f8SKaiGai Kohei xid = je32_to_cpu(rx->xid); 344c9f700f8SKaiGai Kohei version = je32_to_cpu(rx->version); 345c9f700f8SKaiGai Kohei 3468a13695cSKaiGai Kohei totlen = PAD(sizeof(struct jffs2_raw_xattr) 3478a13695cSKaiGai Kohei + rx->name_len + 1 + je16_to_cpu(rx->value_len)); 348aa98d7cfSKaiGai Kohei if (totlen != je32_to_cpu(rx->totlen)) { 349aa98d7cfSKaiGai Kohei JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", 350aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->totlen), totlen); 35168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) 35268270995SDavid Woodhouse return err; 353aa98d7cfSKaiGai Kohei return 0; 354aa98d7cfSKaiGai Kohei } 355aa98d7cfSKaiGai Kohei 356c9f700f8SKaiGai Kohei xd = jffs2_setup_xattr_datum(c, xid, version); 357c9f700f8SKaiGai Kohei if (IS_ERR(xd)) 358aa98d7cfSKaiGai Kohei return PTR_ERR(xd); 359c9f700f8SKaiGai Kohei 360c9f700f8SKaiGai Kohei if (xd->version > version) { 361c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw 362c9f700f8SKaiGai Kohei = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL); 363c9f700f8SKaiGai Kohei raw->next_in_ino = xd->node->next_in_ino; 364c9f700f8SKaiGai Kohei xd->node->next_in_ino = raw; 365c9f700f8SKaiGai Kohei } else { 366c9f700f8SKaiGai Kohei xd->version = version; 367aa98d7cfSKaiGai Kohei xd->xprefix = rx->xprefix; 368aa98d7cfSKaiGai Kohei xd->name_len = rx->name_len; 369aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx->value_len); 370aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx->data_crc); 371aa98d7cfSKaiGai Kohei 372c9f700f8SKaiGai Kohei jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd); 373c9f700f8SKaiGai Kohei } 374f1f9671bSDavid Woodhouse 375aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 376aa98d7cfSKaiGai Kohei jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset); 3773e341740SMasanari Iida dbg_xattr("scanning xdatum at %#08x (xid=%u, version=%u)\n", 378aa98d7cfSKaiGai Kohei ofs, xd->xid, xd->version); 379aa98d7cfSKaiGai Kohei return 0; 380aa98d7cfSKaiGai Kohei } 381aa98d7cfSKaiGai Kohei 382aa98d7cfSKaiGai Kohei static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 383aa98d7cfSKaiGai Kohei struct jffs2_raw_xref *rr, uint32_t ofs, 384aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 385aa98d7cfSKaiGai Kohei { 386aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 387aa98d7cfSKaiGai Kohei uint32_t crc; 38868270995SDavid Woodhouse int err; 389aa98d7cfSKaiGai Kohei 390aa98d7cfSKaiGai Kohei crc = crc32(0, rr, sizeof(*rr) - 4); 391aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr->node_crc)) { 392aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 393aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->node_crc), crc); 39468270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) 39568270995SDavid Woodhouse return err; 396aa98d7cfSKaiGai Kohei return 0; 397aa98d7cfSKaiGai Kohei } 398aa98d7cfSKaiGai Kohei 399aa98d7cfSKaiGai Kohei if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { 40089291a9dSDavid Woodhouse JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n", 401aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->totlen), 402aa98d7cfSKaiGai Kohei PAD(sizeof(struct jffs2_raw_xref))); 40368270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) 40468270995SDavid Woodhouse return err; 405aa98d7cfSKaiGai Kohei return 0; 406aa98d7cfSKaiGai Kohei } 407aa98d7cfSKaiGai Kohei 408aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 409aa98d7cfSKaiGai Kohei if (!ref) 410aa98d7cfSKaiGai Kohei return -ENOMEM; 411aa98d7cfSKaiGai Kohei 412aa98d7cfSKaiGai Kohei /* BEFORE jffs2_build_xattr_subsystem() called, 413c9f700f8SKaiGai Kohei * and AFTER xattr_ref is marked as a dead xref, 414aa98d7cfSKaiGai Kohei * ref->xid is used to store 32bit xid, xd is not used 415aa98d7cfSKaiGai Kohei * ref->ino is used to store 32bit inode-number, ic is not used 416aa98d7cfSKaiGai Kohei * Thoes variables are declared as union, thus using those 4178f2b6f49SKaiGai Kohei * are exclusive. In a similar way, ref->next is temporarily 418aa98d7cfSKaiGai Kohei * used to chain all xattr_ref object. It's re-chained to 419aa98d7cfSKaiGai Kohei * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. 420aa98d7cfSKaiGai Kohei */ 421aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr->ino); 422aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr->xid); 423c9f700f8SKaiGai Kohei ref->xseqno = je32_to_cpu(rr->xseqno); 424c9f700f8SKaiGai Kohei if (ref->xseqno > c->highest_xseqno) 425c9f700f8SKaiGai Kohei c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 4268f2b6f49SKaiGai Kohei ref->next = c->xref_temp; 4278f2b6f49SKaiGai Kohei c->xref_temp = ref; 428aa98d7cfSKaiGai Kohei 429c9f700f8SKaiGai Kohei jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref); 430f1f9671bSDavid Woodhouse 431aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 432aa98d7cfSKaiGai Kohei jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); 433aa98d7cfSKaiGai Kohei dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", 434aa98d7cfSKaiGai Kohei ofs, ref->xid, ref->ino); 435aa98d7cfSKaiGai Kohei return 0; 436aa98d7cfSKaiGai Kohei } 437aa98d7cfSKaiGai Kohei #endif 438aa98d7cfSKaiGai Kohei 4399641b784SDavid Woodhouse /* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into 4409641b784SDavid Woodhouse the flash, XIP-style */ 4411da177e4SLinus Torvalds static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 442e631ddbaSFerenc Havasi unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { 4431da177e4SLinus Torvalds struct jffs2_unknown_node *node; 4441da177e4SLinus Torvalds struct jffs2_unknown_node crcnode; 44541bdc602SJoakim Tjernlund uint32_t ofs, prevofs, max_ofs; 4461da177e4SLinus Torvalds uint32_t hdr_crc, buf_ofs, buf_len; 4471da177e4SLinus Torvalds int err; 4481da177e4SLinus Torvalds int noise = 0; 449e631ddbaSFerenc Havasi 450e631ddbaSFerenc Havasi 4512f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4521da177e4SLinus Torvalds int cleanmarkerfound = 0; 4531da177e4SLinus Torvalds #endif 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds ofs = jeb->offset; 4561da177e4SLinus Torvalds prevofs = jeb->offset - 1; 4571da177e4SLinus Torvalds 4589c261b33SJoe Perches jffs2_dbg(1, "%s(): Scanning block at 0x%x\n", __func__, ofs); 4591da177e4SLinus Torvalds 4602f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4611da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 462a7a6ace1SArtem Bityutskiy int ret; 463a7a6ace1SArtem Bityutskiy 4647086c19dSArtem Bityutskiy if (mtd_block_isbad(c->mtd, jeb->offset)) 465a7a6ace1SArtem Bityutskiy return BLK_STATE_BADBLOCK; 466a7a6ace1SArtem Bityutskiy 467a7a6ace1SArtem Bityutskiy ret = jffs2_check_nand_cleanmarker(c, jeb); 4689c261b33SJoe Perches jffs2_dbg(2, "jffs_check_nand_cleanmarker returned %d\n", ret); 469a7a6ace1SArtem Bityutskiy 4701da177e4SLinus Torvalds /* Even if it's not found, we still scan to see 4711da177e4SLinus Torvalds if the block is empty. We use this information 4721da177e4SLinus Torvalds to decide whether to erase it or not. */ 4731da177e4SLinus Torvalds switch (ret) { 4741da177e4SLinus Torvalds case 0: cleanmarkerfound = 1; break; 4751da177e4SLinus Torvalds case 1: break; 4761da177e4SLinus Torvalds default: return ret; 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds #endif 480e631ddbaSFerenc Havasi 481e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 4829641b784SDavid Woodhouse struct jffs2_sum_marker *sm; 4839641b784SDavid Woodhouse void *sumptr = NULL; 4849641b784SDavid Woodhouse uint32_t sumlen; 485e631ddbaSFerenc Havasi 4869641b784SDavid Woodhouse if (!buf_size) { 4879641b784SDavid Woodhouse /* XIP case. Just look, point at the summary if it's there */ 48813ba42dfSDavid Woodhouse sm = (void *)buf + c->sector_size - sizeof(*sm); 489e631ddbaSFerenc Havasi if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 4909641b784SDavid Woodhouse sumptr = buf + je32_to_cpu(sm->offset); 4919641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 4929641b784SDavid Woodhouse } 4939641b784SDavid Woodhouse } else { 4949641b784SDavid Woodhouse /* If NAND flash, read a whole page of it. Else just the end */ 4959641b784SDavid Woodhouse if (c->wbuf_pagesize) 4969641b784SDavid Woodhouse buf_len = c->wbuf_pagesize; 4979641b784SDavid Woodhouse else 4989641b784SDavid Woodhouse buf_len = sizeof(*sm); 4999641b784SDavid Woodhouse 5009641b784SDavid Woodhouse /* Read as much as we want into the _end_ of the preallocated buffer */ 5019641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, 5029641b784SDavid Woodhouse jeb->offset + c->sector_size - buf_len, 5039641b784SDavid Woodhouse buf_len); 5049641b784SDavid Woodhouse if (err) 5059641b784SDavid Woodhouse return err; 5069641b784SDavid Woodhouse 5079641b784SDavid Woodhouse sm = (void *)buf + buf_size - sizeof(*sm); 5089641b784SDavid Woodhouse if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 5099641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 5109641b784SDavid Woodhouse sumptr = buf + buf_size - sumlen; 5119641b784SDavid Woodhouse 5129641b784SDavid Woodhouse /* Now, make sure the summary itself is available */ 5139641b784SDavid Woodhouse if (sumlen > buf_size) { 5149641b784SDavid Woodhouse /* Need to kmalloc for this. */ 5159641b784SDavid Woodhouse sumptr = kmalloc(sumlen, GFP_KERNEL); 5169641b784SDavid Woodhouse if (!sumptr) 5179641b784SDavid Woodhouse return -ENOMEM; 5189641b784SDavid Woodhouse memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); 5199641b784SDavid Woodhouse } 5209641b784SDavid Woodhouse if (buf_len < sumlen) { 5219641b784SDavid Woodhouse /* Need to read more so that the entire summary node is present */ 5229641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, sumptr, 5239641b784SDavid Woodhouse jeb->offset + c->sector_size - sumlen, 5249641b784SDavid Woodhouse sumlen - buf_len); 5259641b784SDavid Woodhouse if (err) 526e631ddbaSFerenc Havasi return err; 527e631ddbaSFerenc Havasi } 528e631ddbaSFerenc Havasi } 529e631ddbaSFerenc Havasi 5309641b784SDavid Woodhouse } 5319641b784SDavid Woodhouse 5329641b784SDavid Woodhouse if (sumptr) { 5339641b784SDavid Woodhouse err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); 5343560160aSDavid Woodhouse 5359641b784SDavid Woodhouse if (buf_size && sumlen > buf_size) 5369641b784SDavid Woodhouse kfree(sumptr); 5373560160aSDavid Woodhouse /* If it returns with a real error, bail. 5383560160aSDavid Woodhouse If it returns positive, that's a block classification 5393560160aSDavid Woodhouse (i.e. BLK_STATE_xxx) so return that too. 5403560160aSDavid Woodhouse If it returns zero, fall through to full scan. */ 5413560160aSDavid Woodhouse if (err) 5423560160aSDavid Woodhouse return err; 5439641b784SDavid Woodhouse } 544e631ddbaSFerenc Havasi } 545e631ddbaSFerenc Havasi 5461da177e4SLinus Torvalds buf_ofs = jeb->offset; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds if (!buf_size) { 5499641b784SDavid Woodhouse /* This is the XIP case -- we're reading _directly_ from the flash chip */ 5501da177e4SLinus Torvalds buf_len = c->sector_size; 5511da177e4SLinus Torvalds } else { 5523be36675SAndrew Victor buf_len = EMPTY_SCAN_SIZE(c->sector_size); 5531da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); 5541da177e4SLinus Torvalds if (err) 5551da177e4SLinus Torvalds return err; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ 5591da177e4SLinus Torvalds ofs = 0; 56041bdc602SJoakim Tjernlund max_ofs = EMPTY_SCAN_SIZE(c->sector_size); 56141bdc602SJoakim Tjernlund /* Scan only EMPTY_SCAN_SIZE of 0xFF before declaring it's empty */ 56241bdc602SJoakim Tjernlund while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) 5631da177e4SLinus Torvalds ofs += 4; 5641da177e4SLinus Torvalds 56541bdc602SJoakim Tjernlund if (ofs == max_ofs) { 5662f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 5671da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 5681da177e4SLinus Torvalds /* scan oob, take care of cleanmarker */ 5691da177e4SLinus Torvalds int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); 5709c261b33SJoe Perches jffs2_dbg(2, "jffs2_check_oob_empty returned %d\n", 5719c261b33SJoe Perches ret); 5721da177e4SLinus Torvalds switch (ret) { 5731da177e4SLinus Torvalds case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; 5741da177e4SLinus Torvalds case 1: return BLK_STATE_ALLDIRTY; 5751da177e4SLinus Torvalds default: return ret; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds #endif 5799c261b33SJoe Perches jffs2_dbg(1, "Block at 0x%08x is empty (erased)\n", 5809c261b33SJoe Perches jeb->offset); 5818f15fd55SAndrew Victor if (c->cleanmarker_size == 0) 5828f15fd55SAndrew Victor return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ 5838f15fd55SAndrew Victor else 5841da177e4SLinus Torvalds return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ 5851da177e4SLinus Torvalds } 5861da177e4SLinus Torvalds if (ofs) { 5879c261b33SJoe Perches jffs2_dbg(1, "Free space at %08x ends at %08x\n", jeb->offset, 5889c261b33SJoe Perches jeb->offset + ofs); 589a6a8bef7SDavid Woodhouse if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1))) 590a6a8bef7SDavid Woodhouse return err; 59168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) 59268270995SDavid Woodhouse return err; 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /* Now ofs is a complete physical flash offset as it always was... */ 5961da177e4SLinus Torvalds ofs += jeb->offset; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds noise = 10; 5991da177e4SLinus Torvalds 600733802d9SArtem B. Bityutskiy dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); 601e631ddbaSFerenc Havasi 6021da177e4SLinus Torvalds scan_more: 6031da177e4SLinus Torvalds while(ofs < jeb->offset + c->sector_size) { 6041da177e4SLinus Torvalds 605e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 6061da177e4SLinus Torvalds 6072f785402SDavid Woodhouse /* Make sure there are node refs available for use */ 608046b8b98SDavid Woodhouse err = jffs2_prealloc_raw_node_refs(c, jeb, 2); 6092f785402SDavid Woodhouse if (err) 6102f785402SDavid Woodhouse return err; 6112f785402SDavid Woodhouse 6121da177e4SLinus Torvalds cond_resched(); 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds if (ofs & 3) { 615da320f05SJoe Perches pr_warn("Eep. ofs 0x%08x not word-aligned!\n", ofs); 6161da177e4SLinus Torvalds ofs = PAD(ofs); 6171da177e4SLinus Torvalds continue; 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds if (ofs == prevofs) { 620da320f05SJoe Perches pr_warn("ofs 0x%08x has already been seen. Skipping\n", 621da320f05SJoe Perches ofs); 62268270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 62368270995SDavid Woodhouse return err; 6241da177e4SLinus Torvalds ofs += 4; 6251da177e4SLinus Torvalds continue; 6261da177e4SLinus Torvalds } 6271da177e4SLinus Torvalds prevofs = ofs; 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { 6309c261b33SJoe Perches jffs2_dbg(1, "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", 6319c261b33SJoe Perches sizeof(struct jffs2_unknown_node), 6329c261b33SJoe Perches jeb->offset, c->sector_size, ofs, 6339c261b33SJoe Perches sizeof(*node)); 63468270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) 63568270995SDavid Woodhouse return err; 6361da177e4SLinus Torvalds break; 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(*node)) { 6401da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 6419c261b33SJoe Perches jffs2_dbg(1, "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", 6429c261b33SJoe Perches sizeof(struct jffs2_unknown_node), 6439c261b33SJoe Perches buf_len, ofs); 6441da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 6451da177e4SLinus Torvalds if (err) 6461da177e4SLinus Torvalds return err; 6471da177e4SLinus Torvalds buf_ofs = ofs; 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { 6531da177e4SLinus Torvalds uint32_t inbuf_ofs; 654c2aecda7SJoakim Tjernlund uint32_t empty_start, scan_end; 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds empty_start = ofs; 6571da177e4SLinus Torvalds ofs += 4; 658c2aecda7SJoakim Tjernlund scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len); 6591da177e4SLinus Torvalds 6609c261b33SJoe Perches jffs2_dbg(1, "Found empty flash at 0x%08x\n", ofs); 6611da177e4SLinus Torvalds more_empty: 6621da177e4SLinus Torvalds inbuf_ofs = ofs - buf_ofs; 663c2aecda7SJoakim Tjernlund while (inbuf_ofs < scan_end) { 664c2aecda7SJoakim Tjernlund if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) { 665da320f05SJoe Perches pr_warn("Empty flash at 0x%08x ends at 0x%08x\n", 6661da177e4SLinus Torvalds empty_start, ofs); 66768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) 66868270995SDavid Woodhouse return err; 6691da177e4SLinus Torvalds goto scan_more; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds inbuf_ofs+=4; 6731da177e4SLinus Torvalds ofs += 4; 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds /* Ran off end. */ 6769c261b33SJoe Perches jffs2_dbg(1, "Empty flash to end of buffer at 0x%08x\n", 6779c261b33SJoe Perches ofs); 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds /* If we're only checking the beginning of a block with a cleanmarker, 6801da177e4SLinus Torvalds bail now */ 6811da177e4SLinus Torvalds if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && 68299988f7bSDavid Woodhouse c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) { 6839c261b33SJoe Perches jffs2_dbg(1, "%d bytes at start of block seems clean... assuming all clean\n", 6849c261b33SJoe Perches EMPTY_SCAN_SIZE(c->sector_size)); 6851da177e4SLinus Torvalds return BLK_STATE_CLEANMARKER; 6861da177e4SLinus Torvalds } 687c2aecda7SJoakim Tjernlund if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */ 688c2aecda7SJoakim Tjernlund scan_end = buf_len; 689c2aecda7SJoakim Tjernlund goto more_empty; 690c2aecda7SJoakim Tjernlund } 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds /* See how much more there is to read in this eraseblock... */ 6931da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 6941da177e4SLinus Torvalds if (!buf_len) { 6951da177e4SLinus Torvalds /* No more to read. Break out of main loop without marking 6961da177e4SLinus Torvalds this range of empty space as dirty (because it's not) */ 6979c261b33SJoe Perches jffs2_dbg(1, "Empty flash at %08x runs to end of block. Treating as free_space\n", 6989c261b33SJoe Perches empty_start); 6991da177e4SLinus Torvalds break; 7001da177e4SLinus Torvalds } 701c2aecda7SJoakim Tjernlund /* point never reaches here */ 702c2aecda7SJoakim Tjernlund scan_end = buf_len; 7039c261b33SJoe Perches jffs2_dbg(1, "Reading another 0x%x at 0x%08x\n", 7049c261b33SJoe Perches buf_len, ofs); 7051da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 7061da177e4SLinus Torvalds if (err) 7071da177e4SLinus Torvalds return err; 7081da177e4SLinus Torvalds buf_ofs = ofs; 7091da177e4SLinus Torvalds goto more_empty; 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { 713da320f05SJoe Perches pr_warn("Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", 714da320f05SJoe Perches ofs); 71568270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 71668270995SDavid Woodhouse return err; 7171da177e4SLinus Torvalds ofs += 4; 7181da177e4SLinus Torvalds continue; 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { 7219c261b33SJoe Perches jffs2_dbg(1, "Dirty bitmask at 0x%08x\n", ofs); 72268270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 72368270995SDavid Woodhouse return err; 7241da177e4SLinus Torvalds ofs += 4; 7251da177e4SLinus Torvalds continue; 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { 728da320f05SJoe Perches pr_warn("Old JFFS2 bitmask found at 0x%08x\n", ofs); 729da320f05SJoe Perches pr_warn("You cannot use older JFFS2 filesystems with newer kernels\n"); 73068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 73168270995SDavid Woodhouse return err; 7321da177e4SLinus Torvalds ofs += 4; 7331da177e4SLinus Torvalds continue; 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { 7361da177e4SLinus Torvalds /* OK. We're out of possibilities. Whinge and move on */ 737da320f05SJoe Perches noisy_printk(&noise, "%s(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", 738da320f05SJoe Perches __func__, 7391da177e4SLinus Torvalds JFFS2_MAGIC_BITMASK, ofs, 7401da177e4SLinus Torvalds je16_to_cpu(node->magic)); 74168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 74268270995SDavid Woodhouse return err; 7431da177e4SLinus Torvalds ofs += 4; 7441da177e4SLinus Torvalds continue; 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds /* We seem to have a node of sorts. Check the CRC */ 7471da177e4SLinus Torvalds crcnode.magic = node->magic; 7481da177e4SLinus Torvalds crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); 7491da177e4SLinus Torvalds crcnode.totlen = node->totlen; 7501da177e4SLinus Torvalds hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds if (hdr_crc != je32_to_cpu(node->hdr_crc)) { 753da320f05SJoe Perches noisy_printk(&noise, "%s(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n", 754da320f05SJoe Perches __func__, 7551da177e4SLinus Torvalds ofs, je16_to_cpu(node->magic), 7561da177e4SLinus Torvalds je16_to_cpu(node->nodetype), 7571da177e4SLinus Torvalds je32_to_cpu(node->totlen), 7581da177e4SLinus Torvalds je32_to_cpu(node->hdr_crc), 7591da177e4SLinus Torvalds hdr_crc); 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 7660dec4c8bSJoakim Tjernlund if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) { 7671da177e4SLinus Torvalds /* Eep. Node goes over the end of the erase block. */ 768da320f05SJoe Perches pr_warn("Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", 7691da177e4SLinus Torvalds ofs, je32_to_cpu(node->totlen)); 770da320f05SJoe Perches pr_warn("Perhaps the file system was created with the wrong erase size?\n"); 77168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 77268270995SDavid Woodhouse return err; 7731da177e4SLinus Torvalds ofs += 4; 7741da177e4SLinus Torvalds continue; 7751da177e4SLinus Torvalds } 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { 7781da177e4SLinus Torvalds /* Wheee. This is an obsoleted node */ 7799c261b33SJoe Perches jffs2_dbg(2, "Node at 0x%08x is obsolete. Skipping\n", 7809c261b33SJoe Perches ofs); 78168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 78268270995SDavid Woodhouse return err; 7831da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 7841da177e4SLinus Torvalds continue; 7851da177e4SLinus Torvalds } 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds switch(je16_to_cpu(node->nodetype)) { 7881da177e4SLinus Torvalds case JFFS2_NODETYPE_INODE: 7891da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { 7901da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 7919c261b33SJoe Perches jffs2_dbg(1, "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", 7929c261b33SJoe Perches sizeof(struct jffs2_raw_inode), 7939c261b33SJoe Perches buf_len, ofs); 7941da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 7951da177e4SLinus Torvalds if (err) 7961da177e4SLinus Torvalds return err; 7971da177e4SLinus Torvalds buf_ofs = ofs; 7981da177e4SLinus Torvalds node = (void *)buf; 7991da177e4SLinus Torvalds } 800e631ddbaSFerenc Havasi err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); 8011da177e4SLinus Torvalds if (err) return err; 8021da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8031da177e4SLinus Torvalds break; 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds case JFFS2_NODETYPE_DIRENT: 8061da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 8071da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 8089c261b33SJoe Perches jffs2_dbg(1, "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", 8099c261b33SJoe Perches je32_to_cpu(node->totlen), buf_len, 8109c261b33SJoe Perches ofs); 8111da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 8121da177e4SLinus Torvalds if (err) 8131da177e4SLinus Torvalds return err; 8141da177e4SLinus Torvalds buf_ofs = ofs; 8151da177e4SLinus Torvalds node = (void *)buf; 8161da177e4SLinus Torvalds } 817e631ddbaSFerenc Havasi err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); 8181da177e4SLinus Torvalds if (err) return err; 8191da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8201da177e4SLinus Torvalds break; 8211da177e4SLinus Torvalds 822aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 823aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XATTR: 824aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 825aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 8269c261b33SJoe Perches jffs2_dbg(1, "Fewer than %d bytes (xattr node) left to end of buf. Reading 0x%x at 0x%08x\n", 8279c261b33SJoe Perches je32_to_cpu(node->totlen), buf_len, 8289c261b33SJoe Perches ofs); 829aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 830aa98d7cfSKaiGai Kohei if (err) 831aa98d7cfSKaiGai Kohei return err; 832aa98d7cfSKaiGai Kohei buf_ofs = ofs; 833aa98d7cfSKaiGai Kohei node = (void *)buf; 834aa98d7cfSKaiGai Kohei } 835aa98d7cfSKaiGai Kohei err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); 836aa98d7cfSKaiGai Kohei if (err) 837aa98d7cfSKaiGai Kohei return err; 838aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 839aa98d7cfSKaiGai Kohei break; 840aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XREF: 841aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 842aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 8439c261b33SJoe Perches jffs2_dbg(1, "Fewer than %d bytes (xref node) left to end of buf. Reading 0x%x at 0x%08x\n", 8449c261b33SJoe Perches je32_to_cpu(node->totlen), buf_len, 8459c261b33SJoe Perches ofs); 846aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 847aa98d7cfSKaiGai Kohei if (err) 848aa98d7cfSKaiGai Kohei return err; 849aa98d7cfSKaiGai Kohei buf_ofs = ofs; 850aa98d7cfSKaiGai Kohei node = (void *)buf; 851aa98d7cfSKaiGai Kohei } 852aa98d7cfSKaiGai Kohei err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); 853aa98d7cfSKaiGai Kohei if (err) 854aa98d7cfSKaiGai Kohei return err; 855aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 856aa98d7cfSKaiGai Kohei break; 857aa98d7cfSKaiGai Kohei #endif /* CONFIG_JFFS2_FS_XATTR */ 858aa98d7cfSKaiGai Kohei 8591da177e4SLinus Torvalds case JFFS2_NODETYPE_CLEANMARKER: 8609c261b33SJoe Perches jffs2_dbg(1, "CLEANMARKER node found at 0x%08x\n", ofs); 8611da177e4SLinus Torvalds if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { 862da320f05SJoe Perches pr_notice("CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", 863da320f05SJoe Perches ofs, je32_to_cpu(node->totlen), 864da320f05SJoe Perches c->cleanmarker_size); 86568270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) 86668270995SDavid Woodhouse return err; 8671da177e4SLinus Torvalds ofs += PAD(sizeof(struct jffs2_unknown_node)); 8681da177e4SLinus Torvalds } else if (jeb->first_node) { 869da320f05SJoe Perches pr_notice("CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", 870da320f05SJoe Perches ofs, jeb->offset); 87168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) 87268270995SDavid Woodhouse return err; 8731da177e4SLinus Torvalds ofs += PAD(sizeof(struct jffs2_unknown_node)); 8741da177e4SLinus Torvalds } else { 8752f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL); 876f1f9671bSDavid Woodhouse 8771da177e4SLinus Torvalds ofs += PAD(c->cleanmarker_size); 8781da177e4SLinus Torvalds } 8791da177e4SLinus Torvalds break; 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds case JFFS2_NODETYPE_PADDING: 882e631ddbaSFerenc Havasi if (jffs2_sum_active()) 883e631ddbaSFerenc Havasi jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); 88468270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 88568270995SDavid Woodhouse return err; 8861da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8871da177e4SLinus Torvalds break; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds default: 8901da177e4SLinus Torvalds switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { 8911da177e4SLinus Torvalds case JFFS2_FEATURE_ROCOMPAT: 892da320f05SJoe Perches pr_notice("Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", 893da320f05SJoe Perches je16_to_cpu(node->nodetype), ofs); 8941da177e4SLinus Torvalds c->flags |= JFFS2_SB_FLAG_RO; 8951da177e4SLinus Torvalds if (!(jffs2_is_readonly(c))) 8961da177e4SLinus Torvalds return -EROFS; 89768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 89868270995SDavid Woodhouse return err; 8991da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 9001da177e4SLinus Torvalds break; 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds case JFFS2_FEATURE_INCOMPAT: 903da320f05SJoe Perches pr_notice("Incompatible feature node (0x%04x) found at offset 0x%08x\n", 904da320f05SJoe Perches je16_to_cpu(node->nodetype), ofs); 9051da177e4SLinus Torvalds return -EINVAL; 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds case JFFS2_FEATURE_RWCOMPAT_DELETE: 9089c261b33SJoe Perches jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", 9099c261b33SJoe Perches je16_to_cpu(node->nodetype), ofs); 91068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 91168270995SDavid Woodhouse return err; 9121da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 9131da177e4SLinus Torvalds break; 9141da177e4SLinus Torvalds 9156171586aSDavid Woodhouse case JFFS2_FEATURE_RWCOMPAT_COPY: { 9169c261b33SJoe Perches jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", 9179c261b33SJoe Perches je16_to_cpu(node->nodetype), ofs); 9186171586aSDavid Woodhouse 9192f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL); 9206171586aSDavid Woodhouse 9216171586aSDavid Woodhouse /* We can't summarise nodes we don't grok */ 9226171586aSDavid Woodhouse jffs2_sum_disable_collecting(s); 9231da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 9241da177e4SLinus Torvalds break; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds } 9271da177e4SLinus Torvalds } 9286171586aSDavid Woodhouse } 9291da177e4SLinus Torvalds 930e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 931e631ddbaSFerenc Havasi if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { 932733802d9SArtem B. Bityutskiy dbg_summary("There is not enough space for " 933e631ddbaSFerenc Havasi "summary information, disabling for this jeb!\n"); 934e631ddbaSFerenc Havasi jffs2_sum_disable_collecting(s); 935e631ddbaSFerenc Havasi } 936e631ddbaSFerenc Havasi } 9371da177e4SLinus Torvalds 9389c261b33SJoe Perches jffs2_dbg(1, "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n", 9399c261b33SJoe Perches jeb->offset, jeb->free_size, jeb->dirty_size, 9409c261b33SJoe Perches jeb->unchecked_size, jeb->used_size, jeb->wasted_size); 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds /* mark_node_obsolete can add to wasted !! */ 9431da177e4SLinus Torvalds if (jeb->wasted_size) { 9441da177e4SLinus Torvalds jeb->dirty_size += jeb->wasted_size; 9451da177e4SLinus Torvalds c->dirty_size += jeb->wasted_size; 9461da177e4SLinus Torvalds c->wasted_size -= jeb->wasted_size; 9471da177e4SLinus Torvalds jeb->wasted_size = 0; 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds 950e631ddbaSFerenc Havasi return jffs2_scan_classify_jeb(c, jeb); 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds 953e631ddbaSFerenc Havasi struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) 9541da177e4SLinus Torvalds { 9551da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 9581da177e4SLinus Torvalds if (ic) 9591da177e4SLinus Torvalds return ic; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds if (ino > c->highest_ino) 9621da177e4SLinus Torvalds c->highest_ino = ino; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds ic = jffs2_alloc_inode_cache(); 9651da177e4SLinus Torvalds if (!ic) { 966da320f05SJoe Perches pr_notice("%s(): allocation of inode cache failed\n", __func__); 9671da177e4SLinus Torvalds return NULL; 9681da177e4SLinus Torvalds } 9691da177e4SLinus Torvalds memset(ic, 0, sizeof(*ic)); 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds ic->ino = ino; 9721da177e4SLinus Torvalds ic->nodes = (void *)ic; 9731da177e4SLinus Torvalds jffs2_add_ino_cache(c, ic); 9741da177e4SLinus Torvalds if (ino == 1) 97527c72b04SDavid Woodhouse ic->pino_nlink = 1; 9761da177e4SLinus Torvalds return ic; 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 980e631ddbaSFerenc Havasi struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) 9811da177e4SLinus Torvalds { 9821da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 98353043002SThomas Gleixner uint32_t crc, ino = je32_to_cpu(ri->ino); 9841da177e4SLinus Torvalds 9859c261b33SJoe Perches jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs); 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds /* We do very little here now. Just check the ino# to which we should attribute 9881da177e4SLinus Torvalds this node; we can do all the CRC checking etc. later. There's a tradeoff here -- 9891da177e4SLinus Torvalds we used to scan the flash once only, reading everything we want from it into 9901da177e4SLinus Torvalds memory, then building all our in-core data structures and freeing the extra 9911da177e4SLinus Torvalds information. Now we allow the first part of the mount to complete a lot quicker, 9921da177e4SLinus Torvalds but we have to go _back_ to the flash in order to finish the CRC checking, etc. 9931da177e4SLinus Torvalds Which means that the _full_ amount of time to get to proper write mode with GC 9941da177e4SLinus Torvalds operational may actually be _longer_ than before. Sucks to be me. */ 9951da177e4SLinus Torvalds 99653043002SThomas Gleixner /* Check the node CRC in any case. */ 99753043002SThomas Gleixner crc = crc32(0, ri, sizeof(*ri)-8); 99853043002SThomas Gleixner if (crc != je32_to_cpu(ri->node_crc)) { 999da320f05SJoe Perches pr_notice("%s(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 1000da320f05SJoe Perches __func__, ofs, je32_to_cpu(ri->node_crc), crc); 100153043002SThomas Gleixner /* 100253043002SThomas Gleixner * We believe totlen because the CRC on the node 100353043002SThomas Gleixner * _header_ was OK, just the node itself failed. 100453043002SThomas Gleixner */ 100553043002SThomas Gleixner return jffs2_scan_dirty_space(c, jeb, 100653043002SThomas Gleixner PAD(je32_to_cpu(ri->totlen))); 100753043002SThomas Gleixner } 100853043002SThomas Gleixner 10091da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 10101da177e4SLinus Torvalds if (!ic) { 10111da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, ino); 10122f785402SDavid Woodhouse if (!ic) 10131da177e4SLinus Torvalds return -ENOMEM; 10141da177e4SLinus Torvalds } 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds /* Wheee. It worked */ 10172f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic); 10181da177e4SLinus Torvalds 10199c261b33SJoe Perches jffs2_dbg(1, "Node is ino #%u, version %d. Range 0x%x-0x%x\n", 10201da177e4SLinus Torvalds je32_to_cpu(ri->ino), je32_to_cpu(ri->version), 10211da177e4SLinus Torvalds je32_to_cpu(ri->offset), 10229c261b33SJoe Perches je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize)); 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds pseudo_random += je32_to_cpu(ri->version); 10251da177e4SLinus Torvalds 1026e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1027e631ddbaSFerenc Havasi jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); 1028e631ddbaSFerenc Havasi } 1029e631ddbaSFerenc Havasi 10301da177e4SLinus Torvalds return 0; 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 1034e631ddbaSFerenc Havasi struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) 10351da177e4SLinus Torvalds { 10361da177e4SLinus Torvalds struct jffs2_full_dirent *fd; 10371da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 1038b534e70cSDavid Woodhouse uint32_t checkedlen; 10391da177e4SLinus Torvalds uint32_t crc; 104068270995SDavid Woodhouse int err; 10411da177e4SLinus Torvalds 10429c261b33SJoe Perches jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs); 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds /* We don't get here unless the node is still valid, so we don't have to 10451da177e4SLinus Torvalds mask in the ACCURATE bit any more. */ 10461da177e4SLinus Torvalds crc = crc32(0, rd, sizeof(*rd)-8); 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->node_crc)) { 1049da320f05SJoe Perches pr_notice("%s(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 1050da320f05SJoe Perches __func__, ofs, je32_to_cpu(rd->node_crc), crc); 10511da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ 105268270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) 105368270995SDavid Woodhouse return err; 10541da177e4SLinus Torvalds return 0; 10551da177e4SLinus Torvalds } 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds pseudo_random += je32_to_cpu(rd->version); 10581da177e4SLinus Torvalds 1059b534e70cSDavid Woodhouse /* Should never happen. Did. (OLPC trac #4184)*/ 1060b534e70cSDavid Woodhouse checkedlen = strnlen(rd->name, rd->nsize); 1061b534e70cSDavid Woodhouse if (checkedlen < rd->nsize) { 1062da320f05SJoe Perches pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n", 1063b534e70cSDavid Woodhouse ofs, checkedlen); 1064b534e70cSDavid Woodhouse } 1065b534e70cSDavid Woodhouse fd = jffs2_alloc_full_dirent(checkedlen+1); 10661da177e4SLinus Torvalds if (!fd) { 10671da177e4SLinus Torvalds return -ENOMEM; 10681da177e4SLinus Torvalds } 1069b534e70cSDavid Woodhouse memcpy(&fd->name, rd->name, checkedlen); 1070b534e70cSDavid Woodhouse fd->name[checkedlen] = 0; 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds crc = crc32(0, fd->name, rd->nsize); 10731da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->name_crc)) { 1074da320f05SJoe Perches pr_notice("%s(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 1075da320f05SJoe Perches __func__, ofs, je32_to_cpu(rd->name_crc), crc); 10769c261b33SJoe Perches jffs2_dbg(1, "Name for which CRC failed is (now) '%s', ino #%d\n", 10779c261b33SJoe Perches fd->name, je32_to_cpu(rd->ino)); 10781da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10791da177e4SLinus Torvalds /* FIXME: Why do we believe totlen? */ 10801da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ 108168270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) 108268270995SDavid Woodhouse return err; 10831da177e4SLinus Torvalds return 0; 10841da177e4SLinus Torvalds } 10851da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); 10861da177e4SLinus Torvalds if (!ic) { 10871da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10881da177e4SLinus Torvalds return -ENOMEM; 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds 109143dfa07fSDavid Woodhouse fd->raw = jffs2_link_node_ref(c, jeb, ofs | dirent_node_state(rd), 109243dfa07fSDavid Woodhouse PAD(je32_to_cpu(rd->totlen)), ic); 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds fd->next = NULL; 10951da177e4SLinus Torvalds fd->version = je32_to_cpu(rd->version); 10961da177e4SLinus Torvalds fd->ino = je32_to_cpu(rd->ino); 1097b534e70cSDavid Woodhouse fd->nhash = full_name_hash(fd->name, checkedlen); 10981da177e4SLinus Torvalds fd->type = rd->type; 10991da177e4SLinus Torvalds jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 11001da177e4SLinus Torvalds 1101e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1102e631ddbaSFerenc Havasi jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); 1103e631ddbaSFerenc Havasi } 1104e631ddbaSFerenc Havasi 11051da177e4SLinus Torvalds return 0; 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds static int count_list(struct list_head *l) 11091da177e4SLinus Torvalds { 11101da177e4SLinus Torvalds uint32_t count = 0; 11111da177e4SLinus Torvalds struct list_head *tmp; 11121da177e4SLinus Torvalds 11131da177e4SLinus Torvalds list_for_each(tmp, l) { 11141da177e4SLinus Torvalds count++; 11151da177e4SLinus Torvalds } 11161da177e4SLinus Torvalds return count; 11171da177e4SLinus Torvalds } 11181da177e4SLinus Torvalds 11191da177e4SLinus Torvalds /* Note: This breaks if list_empty(head). I don't care. You 11201da177e4SLinus Torvalds might, if you copy this code and use it elsewhere :) */ 11211da177e4SLinus Torvalds static void rotate_list(struct list_head *head, uint32_t count) 11221da177e4SLinus Torvalds { 11231da177e4SLinus Torvalds struct list_head *n = head->next; 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds list_del(head); 11261da177e4SLinus Torvalds while(count--) { 11271da177e4SLinus Torvalds n = n->next; 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds list_add(head, n); 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds void jffs2_rotate_lists(struct jffs2_sb_info *c) 11331da177e4SLinus Torvalds { 11341da177e4SLinus Torvalds uint32_t x; 11351da177e4SLinus Torvalds uint32_t rotateby; 11361da177e4SLinus Torvalds 11371da177e4SLinus Torvalds x = count_list(&c->clean_list); 11381da177e4SLinus Torvalds if (x) { 11391da177e4SLinus Torvalds rotateby = pseudo_random % x; 11401da177e4SLinus Torvalds rotate_list((&c->clean_list), rotateby); 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds x = count_list(&c->very_dirty_list); 11441da177e4SLinus Torvalds if (x) { 11451da177e4SLinus Torvalds rotateby = pseudo_random % x; 11461da177e4SLinus Torvalds rotate_list((&c->very_dirty_list), rotateby); 11471da177e4SLinus Torvalds } 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds x = count_list(&c->dirty_list); 11501da177e4SLinus Torvalds if (x) { 11511da177e4SLinus Torvalds rotateby = pseudo_random % x; 11521da177e4SLinus Torvalds rotate_list((&c->dirty_list), rotateby); 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds x = count_list(&c->erasable_list); 11561da177e4SLinus Torvalds if (x) { 11571da177e4SLinus Torvalds rotateby = pseudo_random % x; 11581da177e4SLinus Torvalds rotate_list((&c->erasable_list), rotateby); 11591da177e4SLinus Torvalds } 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 11621da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_erasing_blocks; 11631da177e4SLinus Torvalds rotate_list((&c->erase_pending_list), rotateby); 11641da177e4SLinus Torvalds } 11651da177e4SLinus Torvalds 11661da177e4SLinus Torvalds if (c->nr_free_blocks) { 11671da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_free_blocks; 11681da177e4SLinus Torvalds rotate_list((&c->free_list), rotateby); 11691da177e4SLinus Torvalds } 11701da177e4SLinus Torvalds } 1171