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 125a528957SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 135a528957SJoe Perches 141da177e4SLinus Torvalds #include <linux/kernel.h> 151da177e4SLinus Torvalds #include <linux/sched.h> 161da177e4SLinus Torvalds #include <linux/slab.h> 171da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 181da177e4SLinus Torvalds #include <linux/pagemap.h> 191da177e4SLinus Torvalds #include <linux/crc32.h> 201da177e4SLinus Torvalds #include <linux/compiler.h> 211da177e4SLinus Torvalds #include "nodelist.h" 22e631ddbaSFerenc Havasi #include "summary.h" 23e631ddbaSFerenc Havasi #include "debug.h" 241da177e4SLinus Torvalds 2541bdc602SJoakim Tjernlund #define DEFAULT_EMPTY_SCAN_SIZE 256 261da177e4SLinus Torvalds 27da320f05SJoe Perches #define noisy_printk(noise, fmt, ...) \ 28da320f05SJoe Perches do { \ 291da177e4SLinus Torvalds if (*(noise)) { \ 30da320f05SJoe Perches pr_notice(fmt, ##__VA_ARGS__); \ 311da177e4SLinus Torvalds (*(noise))--; \ 32da320f05SJoe Perches if (!(*(noise))) \ 33da320f05SJoe Perches pr_notice("Further such events for this erase block will not be printed\n"); \ 341da177e4SLinus Torvalds } \ 351da177e4SLinus Torvalds } while (0) 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds static uint32_t pseudo_random; 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 40e631ddbaSFerenc Havasi unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s); 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds /* These helper functions _must_ increase ofs and also do the dirty/used space accounting. 431da177e4SLinus Torvalds * Returning an error will abort the mount - bad checksums etc. should just mark the space 441da177e4SLinus Torvalds * as dirty. 451da177e4SLinus Torvalds */ 461da177e4SLinus Torvalds static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 47e631ddbaSFerenc Havasi struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s); 481da177e4SLinus Torvalds static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 49e631ddbaSFerenc Havasi struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s); 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds static inline int min_free(struct jffs2_sb_info *c) 521da177e4SLinus Torvalds { 531da177e4SLinus Torvalds uint32_t min = 2 * sizeof(struct jffs2_raw_inode); 542f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 551da177e4SLinus Torvalds if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize) 561da177e4SLinus Torvalds return c->wbuf_pagesize; 571da177e4SLinus Torvalds #endif 581da177e4SLinus Torvalds return min; 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds } 613be36675SAndrew Victor 623be36675SAndrew Victor static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) { 633be36675SAndrew Victor if (sector_size < DEFAULT_EMPTY_SCAN_SIZE) 643be36675SAndrew Victor return sector_size; 653be36675SAndrew Victor else 663be36675SAndrew Victor return DEFAULT_EMPTY_SCAN_SIZE; 673be36675SAndrew Victor } 683be36675SAndrew Victor 6925090a6bSDavid Woodhouse static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 7025090a6bSDavid Woodhouse { 71a6a8bef7SDavid Woodhouse int ret; 72a6a8bef7SDavid Woodhouse 73a6a8bef7SDavid Woodhouse if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1))) 74a6a8bef7SDavid Woodhouse return ret; 75a6a8bef7SDavid Woodhouse if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size))) 7625090a6bSDavid Woodhouse return ret; 7725090a6bSDavid Woodhouse /* Turned wasted size into dirty, since we apparently 7825090a6bSDavid Woodhouse think it's recoverable now. */ 7925090a6bSDavid Woodhouse jeb->dirty_size += jeb->wasted_size; 8025090a6bSDavid Woodhouse c->dirty_size += jeb->wasted_size; 8125090a6bSDavid Woodhouse c->wasted_size -= jeb->wasted_size; 8225090a6bSDavid Woodhouse jeb->wasted_size = 0; 8325090a6bSDavid Woodhouse if (VERYDIRTY(c, jeb->dirty_size)) { 8425090a6bSDavid Woodhouse list_add(&jeb->list, &c->very_dirty_list); 8525090a6bSDavid Woodhouse } else { 8625090a6bSDavid Woodhouse list_add(&jeb->list, &c->dirty_list); 8725090a6bSDavid Woodhouse } 8825090a6bSDavid Woodhouse return 0; 8925090a6bSDavid Woodhouse } 9025090a6bSDavid Woodhouse 911da177e4SLinus Torvalds int jffs2_scan_medium(struct jffs2_sb_info *c) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds int i, ret; 941da177e4SLinus Torvalds uint32_t empty_blocks = 0, bad_blocks = 0; 951da177e4SLinus Torvalds unsigned char *flashbuf = NULL; 961da177e4SLinus Torvalds uint32_t buf_size = 0; 97e631ddbaSFerenc Havasi struct jffs2_summary *s = NULL; /* summary info collected by the scan process */ 981da177e4SLinus Torvalds #ifndef __ECOS 991ddd0d9aSGrant Erickson size_t pointlen, try_size; 1001da177e4SLinus Torvalds 101d35ea200SArtem Bityutskiy ret = mtd_point(c->mtd, 0, c->mtd->size, &pointlen, 102a98889f3SJared Hulbert (void **)&flashbuf, NULL); 1031da177e4SLinus Torvalds if (!ret && pointlen < c->mtd->size) { 1041da177e4SLinus Torvalds /* Don't muck about if it won't let us point to the whole flash */ 1059c261b33SJoe Perches jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n", 1069c261b33SJoe Perches pointlen); 1077219778aSArtem Bityutskiy mtd_unpoint(c->mtd, 0, pointlen); 1081da177e4SLinus Torvalds flashbuf = NULL; 1091da177e4SLinus Torvalds } 11010934478SArtem Bityutskiy if (ret && ret != -EOPNOTSUPP) 1119c261b33SJoe Perches jffs2_dbg(1, "MTD point failed %d\n", ret); 1121da177e4SLinus Torvalds #endif 1131da177e4SLinus Torvalds if (!flashbuf) { 1141da177e4SLinus Torvalds /* For NAND it's quicker to read a whole eraseblock at a time, 1151da177e4SLinus Torvalds apparently */ 1161da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 1171ddd0d9aSGrant Erickson try_size = c->sector_size; 1181da177e4SLinus Torvalds else 1191ddd0d9aSGrant Erickson try_size = PAGE_SIZE; 1201da177e4SLinus Torvalds 1219c261b33SJoe Perches jffs2_dbg(1, "Trying to allocate readbuf of %zu " 1229c261b33SJoe Perches "bytes\n", try_size); 1231da177e4SLinus Torvalds 1241ddd0d9aSGrant Erickson flashbuf = mtd_kmalloc_up_to(c->mtd, &try_size); 1251da177e4SLinus Torvalds if (!flashbuf) 1261da177e4SLinus Torvalds return -ENOMEM; 1271ddd0d9aSGrant Erickson 1289c261b33SJoe Perches jffs2_dbg(1, "Allocated readbuf of %zu bytes\n", 1299c261b33SJoe Perches try_size); 1301ddd0d9aSGrant Erickson 1311ddd0d9aSGrant Erickson buf_size = (uint32_t)try_size; 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 134e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1353d375d9eSYan Burman s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 136e631ddbaSFerenc Havasi if (!s) { 137e631ddbaSFerenc Havasi JFFS2_WARNING("Can't allocate memory for summary\n"); 13848396413SDavid Woodhouse ret = -ENOMEM; 13948396413SDavid Woodhouse goto out; 140e631ddbaSFerenc Havasi } 141e631ddbaSFerenc Havasi } 142e631ddbaSFerenc Havasi 1431da177e4SLinus Torvalds for (i=0; i<c->nr_blocks; i++) { 1441da177e4SLinus Torvalds struct jffs2_eraseblock *jeb = &c->blocks[i]; 1451da177e4SLinus Torvalds 146a2166b93SArtem Bityutskiy cond_resched(); 147a2166b93SArtem Bityutskiy 148e631ddbaSFerenc Havasi /* reset summary info for next eraseblock scan */ 149e631ddbaSFerenc Havasi jffs2_sum_reset_collected(s); 150e631ddbaSFerenc Havasi 151e631ddbaSFerenc Havasi ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), 152e631ddbaSFerenc Havasi buf_size, s); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds if (ret < 0) 1551da177e4SLinus Torvalds goto out; 1561da177e4SLinus Torvalds 157e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds /* Now decide which list to put it on */ 1601da177e4SLinus Torvalds switch(ret) { 1611da177e4SLinus Torvalds case BLK_STATE_ALLFF: 1621da177e4SLinus Torvalds /* 1631da177e4SLinus Torvalds * Empty block. Since we can't be sure it 1641da177e4SLinus Torvalds * was entirely erased, we just queue it for erase 1651da177e4SLinus Torvalds * again. It will be marked as such when the erase 1661da177e4SLinus Torvalds * is complete. Meanwhile we still count it as empty 1671da177e4SLinus Torvalds * for later checks. 1681da177e4SLinus Torvalds */ 1691da177e4SLinus Torvalds empty_blocks++; 1701da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1711da177e4SLinus Torvalds c->nr_erasing_blocks++; 1721da177e4SLinus Torvalds break; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds case BLK_STATE_CLEANMARKER: 1751da177e4SLinus Torvalds /* Only a CLEANMARKER node is valid */ 1761da177e4SLinus Torvalds if (!jeb->dirty_size) { 1771da177e4SLinus Torvalds /* It's actually free */ 1781da177e4SLinus Torvalds list_add(&jeb->list, &c->free_list); 1791da177e4SLinus Torvalds c->nr_free_blocks++; 1801da177e4SLinus Torvalds } else { 1811da177e4SLinus Torvalds /* Dirt */ 1829c261b33SJoe Perches jffs2_dbg(1, "Adding all-dirty block at 0x%08x to erase_pending_list\n", 1839c261b33SJoe Perches jeb->offset); 1841da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1851da177e4SLinus Torvalds c->nr_erasing_blocks++; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds break; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds case BLK_STATE_CLEAN: 1901da177e4SLinus Torvalds /* Full (or almost full) of clean data. Clean list */ 1911da177e4SLinus Torvalds list_add(&jeb->list, &c->clean_list); 1921da177e4SLinus Torvalds break; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds case BLK_STATE_PARTDIRTY: 1951da177e4SLinus Torvalds /* Some data, but not full. Dirty list. */ 1961da177e4SLinus Torvalds /* We want to remember the block with most free space 1971da177e4SLinus Torvalds and stick it in the 'nextblock' position to start writing to it. */ 1981da177e4SLinus Torvalds if (jeb->free_size > min_free(c) && 1991da177e4SLinus Torvalds (!c->nextblock || c->nextblock->free_size < jeb->free_size)) { 2001da177e4SLinus Torvalds /* Better candidate for the next writes to go to */ 2011da177e4SLinus Torvalds if (c->nextblock) { 20225090a6bSDavid Woodhouse ret = file_dirty(c, c->nextblock); 20325090a6bSDavid Woodhouse if (ret) 204a2ab0ce0SChristian Engelmayer goto out; 205e631ddbaSFerenc Havasi /* deleting summary information of the old nextblock */ 206e631ddbaSFerenc Havasi jffs2_sum_reset_collected(c->summary); 2071da177e4SLinus Torvalds } 20825090a6bSDavid Woodhouse /* update collected summary information for the current nextblock */ 209e631ddbaSFerenc Havasi jffs2_sum_move_collected(c, s); 2109c261b33SJoe Perches jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n", 2119c261b33SJoe Perches __func__, jeb->offset); 2121da177e4SLinus Torvalds c->nextblock = jeb; 2131da177e4SLinus Torvalds } else { 21425090a6bSDavid Woodhouse ret = file_dirty(c, jeb); 21525090a6bSDavid Woodhouse if (ret) 216a2ab0ce0SChristian Engelmayer goto out; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds break; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds case BLK_STATE_ALLDIRTY: 2211da177e4SLinus Torvalds /* Nothing valid - not even a clean marker. Needs erasing. */ 2221da177e4SLinus Torvalds /* For now we just put it on the erasing list. We'll start the erases later */ 2235a528957SJoe Perches jffs2_dbg(1, "Erase block at 0x%08x is not formatted. It will be erased\n", 2249c261b33SJoe Perches jeb->offset); 2251da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 2261da177e4SLinus Torvalds c->nr_erasing_blocks++; 2271da177e4SLinus Torvalds break; 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds case BLK_STATE_BADBLOCK: 2305a528957SJoe Perches jffs2_dbg(1, "Block at 0x%08x is bad\n", jeb->offset); 2311da177e4SLinus Torvalds list_add(&jeb->list, &c->bad_list); 2321da177e4SLinus Torvalds c->bad_size += c->sector_size; 2331da177e4SLinus Torvalds c->free_size -= c->sector_size; 2341da177e4SLinus Torvalds bad_blocks++; 2351da177e4SLinus Torvalds break; 2361da177e4SLinus Torvalds default: 237da320f05SJoe Perches pr_warn("%s(): unknown block state\n", __func__); 2381da177e4SLinus Torvalds BUG(); 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */ 2431da177e4SLinus Torvalds if (c->nextblock && (c->nextblock->dirty_size)) { 2441da177e4SLinus Torvalds c->nextblock->wasted_size += c->nextblock->dirty_size; 2451da177e4SLinus Torvalds c->wasted_size += c->nextblock->dirty_size; 2461da177e4SLinus Torvalds c->dirty_size -= c->nextblock->dirty_size; 2471da177e4SLinus Torvalds c->nextblock->dirty_size = 0; 2481da177e4SLinus Torvalds } 2492f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 250e96fb230SDavid Woodhouse if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) { 2511da177e4SLinus Torvalds /* If we're going to start writing into a block which already 2521da177e4SLinus Torvalds contains data, and the end of the data isn't page-aligned, 2531da177e4SLinus Torvalds skip a little and align it. */ 2541da177e4SLinus Torvalds 255daba5cc4SArtem B. Bityutskiy uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize; 2561da177e4SLinus Torvalds 2579c261b33SJoe Perches jffs2_dbg(1, "%s(): Skipping %d bytes in nextblock to ensure page alignment\n", 2589c261b33SJoe Perches __func__, skip); 259046b8b98SDavid Woodhouse jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); 260f560928bSDavid Woodhouse jffs2_scan_dirty_space(c, c->nextblock, skip); 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds #endif 2631da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 2641da177e4SLinus Torvalds if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) { 265da320f05SJoe Perches pr_notice("Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n"); 266da320f05SJoe Perches pr_notice("empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n", 267da320f05SJoe Perches empty_blocks, bad_blocks, c->nr_blocks); 2681da177e4SLinus Torvalds ret = -EIO; 2691da177e4SLinus Torvalds goto out; 2701da177e4SLinus Torvalds } 271ae3b6ba0SDavid Woodhouse spin_lock(&c->erase_completion_lock); 272ae3b6ba0SDavid Woodhouse jffs2_garbage_collect_trigger(c); 273ae3b6ba0SDavid Woodhouse spin_unlock(&c->erase_completion_lock); 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds ret = 0; 2761da177e4SLinus Torvalds out: 2771da177e4SLinus Torvalds if (buf_size) 2781da177e4SLinus Torvalds kfree(flashbuf); 2791da177e4SLinus Torvalds #ifndef __ECOS 2801da177e4SLinus Torvalds else 2817219778aSArtem Bityutskiy mtd_unpoint(c->mtd, 0, c->mtd->size); 2821da177e4SLinus Torvalds #endif 2835b5ffbc1SFlorin Malita kfree(s); 2841da177e4SLinus Torvalds return ret; 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 287c05d52c7SAdrian Bunk static int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf, 2881da177e4SLinus Torvalds uint32_t ofs, uint32_t len) 2891da177e4SLinus Torvalds { 2901da177e4SLinus Torvalds int ret; 2911da177e4SLinus Torvalds size_t retlen; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds ret = jffs2_flash_read(c, ofs, len, &retlen, buf); 2941da177e4SLinus Torvalds if (ret) { 2959c261b33SJoe Perches jffs2_dbg(1, "mtd->read(0x%x bytes from 0x%x) returned %d\n", 2969c261b33SJoe Perches len, ofs, ret); 2971da177e4SLinus Torvalds return ret; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds if (retlen < len) { 3009c261b33SJoe Perches jffs2_dbg(1, "Read at 0x%x gave only 0x%zx bytes\n", 3019c261b33SJoe Perches ofs, retlen); 3021da177e4SLinus Torvalds return -EIO; 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds return 0; 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds 307e631ddbaSFerenc Havasi int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 308e631ddbaSFerenc Havasi { 309e631ddbaSFerenc Havasi if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size 31099988f7bSDavid Woodhouse && (!jeb->first_node || !ref_next(jeb->first_node)) ) 311e631ddbaSFerenc Havasi return BLK_STATE_CLEANMARKER; 312e631ddbaSFerenc Havasi 313e631ddbaSFerenc Havasi /* move blocks with max 4 byte dirty space to cleanlist */ 314e631ddbaSFerenc Havasi else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) { 315e631ddbaSFerenc Havasi c->dirty_size -= jeb->dirty_size; 316e631ddbaSFerenc Havasi c->wasted_size += jeb->dirty_size; 317e631ddbaSFerenc Havasi jeb->wasted_size += jeb->dirty_size; 318e631ddbaSFerenc Havasi jeb->dirty_size = 0; 319e631ddbaSFerenc Havasi return BLK_STATE_CLEAN; 320e631ddbaSFerenc Havasi } else if (jeb->used_size || jeb->unchecked_size) 321e631ddbaSFerenc Havasi return BLK_STATE_PARTDIRTY; 322e631ddbaSFerenc Havasi else 323e631ddbaSFerenc Havasi return BLK_STATE_ALLDIRTY; 324e631ddbaSFerenc Havasi } 325e631ddbaSFerenc Havasi 326aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 327aa98d7cfSKaiGai Kohei static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 328aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr *rx, uint32_t ofs, 329aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 330aa98d7cfSKaiGai Kohei { 331aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 332c9f700f8SKaiGai Kohei uint32_t xid, version, totlen, crc; 33368270995SDavid Woodhouse int err; 334aa98d7cfSKaiGai Kohei 335aa98d7cfSKaiGai Kohei crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); 336aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx->node_crc)) { 337aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 338aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->node_crc), crc); 33968270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) 34068270995SDavid Woodhouse return err; 341aa98d7cfSKaiGai Kohei return 0; 342aa98d7cfSKaiGai Kohei } 343aa98d7cfSKaiGai Kohei 344c9f700f8SKaiGai Kohei xid = je32_to_cpu(rx->xid); 345c9f700f8SKaiGai Kohei version = je32_to_cpu(rx->version); 346c9f700f8SKaiGai Kohei 3478a13695cSKaiGai Kohei totlen = PAD(sizeof(struct jffs2_raw_xattr) 3488a13695cSKaiGai Kohei + rx->name_len + 1 + je16_to_cpu(rx->value_len)); 349aa98d7cfSKaiGai Kohei if (totlen != je32_to_cpu(rx->totlen)) { 350aa98d7cfSKaiGai Kohei JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", 351aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rx->totlen), totlen); 35268270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) 35368270995SDavid Woodhouse return err; 354aa98d7cfSKaiGai Kohei return 0; 355aa98d7cfSKaiGai Kohei } 356aa98d7cfSKaiGai Kohei 357c9f700f8SKaiGai Kohei xd = jffs2_setup_xattr_datum(c, xid, version); 358c9f700f8SKaiGai Kohei if (IS_ERR(xd)) 359aa98d7cfSKaiGai Kohei return PTR_ERR(xd); 360c9f700f8SKaiGai Kohei 361c9f700f8SKaiGai Kohei if (xd->version > version) { 362c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw 363c9f700f8SKaiGai Kohei = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL); 364c9f700f8SKaiGai Kohei raw->next_in_ino = xd->node->next_in_ino; 365c9f700f8SKaiGai Kohei xd->node->next_in_ino = raw; 366c9f700f8SKaiGai Kohei } else { 367c9f700f8SKaiGai Kohei xd->version = version; 368aa98d7cfSKaiGai Kohei xd->xprefix = rx->xprefix; 369aa98d7cfSKaiGai Kohei xd->name_len = rx->name_len; 370aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx->value_len); 371aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx->data_crc); 372aa98d7cfSKaiGai Kohei 373c9f700f8SKaiGai Kohei jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd); 374c9f700f8SKaiGai Kohei } 375f1f9671bSDavid Woodhouse 376aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 377aa98d7cfSKaiGai Kohei jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset); 3783e341740SMasanari Iida dbg_xattr("scanning xdatum at %#08x (xid=%u, version=%u)\n", 379aa98d7cfSKaiGai Kohei ofs, xd->xid, xd->version); 380aa98d7cfSKaiGai Kohei return 0; 381aa98d7cfSKaiGai Kohei } 382aa98d7cfSKaiGai Kohei 383aa98d7cfSKaiGai Kohei static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 384aa98d7cfSKaiGai Kohei struct jffs2_raw_xref *rr, uint32_t ofs, 385aa98d7cfSKaiGai Kohei struct jffs2_summary *s) 386aa98d7cfSKaiGai Kohei { 387aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 388aa98d7cfSKaiGai Kohei uint32_t crc; 38968270995SDavid Woodhouse int err; 390aa98d7cfSKaiGai Kohei 391aa98d7cfSKaiGai Kohei crc = crc32(0, rr, sizeof(*rr) - 4); 392aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr->node_crc)) { 393aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 394aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->node_crc), crc); 39568270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) 39668270995SDavid Woodhouse return err; 397aa98d7cfSKaiGai Kohei return 0; 398aa98d7cfSKaiGai Kohei } 399aa98d7cfSKaiGai Kohei 400aa98d7cfSKaiGai Kohei if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { 40189291a9dSDavid Woodhouse JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n", 402aa98d7cfSKaiGai Kohei ofs, je32_to_cpu(rr->totlen), 403aa98d7cfSKaiGai Kohei PAD(sizeof(struct jffs2_raw_xref))); 40468270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) 40568270995SDavid Woodhouse return err; 406aa98d7cfSKaiGai Kohei return 0; 407aa98d7cfSKaiGai Kohei } 408aa98d7cfSKaiGai Kohei 409aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 410aa98d7cfSKaiGai Kohei if (!ref) 411aa98d7cfSKaiGai Kohei return -ENOMEM; 412aa98d7cfSKaiGai Kohei 413aa98d7cfSKaiGai Kohei /* BEFORE jffs2_build_xattr_subsystem() called, 414c9f700f8SKaiGai Kohei * and AFTER xattr_ref is marked as a dead xref, 415aa98d7cfSKaiGai Kohei * ref->xid is used to store 32bit xid, xd is not used 416aa98d7cfSKaiGai Kohei * ref->ino is used to store 32bit inode-number, ic is not used 417aa98d7cfSKaiGai Kohei * Thoes variables are declared as union, thus using those 4188f2b6f49SKaiGai Kohei * are exclusive. In a similar way, ref->next is temporarily 419aa98d7cfSKaiGai Kohei * used to chain all xattr_ref object. It's re-chained to 420aa98d7cfSKaiGai Kohei * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. 421aa98d7cfSKaiGai Kohei */ 422aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr->ino); 423aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr->xid); 424c9f700f8SKaiGai Kohei ref->xseqno = je32_to_cpu(rr->xseqno); 425c9f700f8SKaiGai Kohei if (ref->xseqno > c->highest_xseqno) 426c9f700f8SKaiGai Kohei c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 4278f2b6f49SKaiGai Kohei ref->next = c->xref_temp; 4288f2b6f49SKaiGai Kohei c->xref_temp = ref; 429aa98d7cfSKaiGai Kohei 430c9f700f8SKaiGai Kohei jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref); 431f1f9671bSDavid Woodhouse 432aa98d7cfSKaiGai Kohei if (jffs2_sum_active()) 433aa98d7cfSKaiGai Kohei jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); 434aa98d7cfSKaiGai Kohei dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", 435aa98d7cfSKaiGai Kohei ofs, ref->xid, ref->ino); 436aa98d7cfSKaiGai Kohei return 0; 437aa98d7cfSKaiGai Kohei } 438aa98d7cfSKaiGai Kohei #endif 439aa98d7cfSKaiGai Kohei 4409641b784SDavid Woodhouse /* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into 4419641b784SDavid Woodhouse the flash, XIP-style */ 4421da177e4SLinus Torvalds static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 443e631ddbaSFerenc Havasi unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) { 4441da177e4SLinus Torvalds struct jffs2_unknown_node *node; 4451da177e4SLinus Torvalds struct jffs2_unknown_node crcnode; 44641bdc602SJoakim Tjernlund uint32_t ofs, prevofs, max_ofs; 4471da177e4SLinus Torvalds uint32_t hdr_crc, buf_ofs, buf_len; 4481da177e4SLinus Torvalds int err; 4491da177e4SLinus Torvalds int noise = 0; 450e631ddbaSFerenc Havasi 451e631ddbaSFerenc Havasi 4522f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4531da177e4SLinus Torvalds int cleanmarkerfound = 0; 4541da177e4SLinus Torvalds #endif 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds ofs = jeb->offset; 4571da177e4SLinus Torvalds prevofs = jeb->offset - 1; 4581da177e4SLinus Torvalds 4599c261b33SJoe Perches jffs2_dbg(1, "%s(): Scanning block at 0x%x\n", __func__, ofs); 4601da177e4SLinus Torvalds 4612f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 4621da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 463a7a6ace1SArtem Bityutskiy int ret; 464a7a6ace1SArtem Bityutskiy 4657086c19dSArtem Bityutskiy if (mtd_block_isbad(c->mtd, jeb->offset)) 466a7a6ace1SArtem Bityutskiy return BLK_STATE_BADBLOCK; 467a7a6ace1SArtem Bityutskiy 468a7a6ace1SArtem Bityutskiy ret = jffs2_check_nand_cleanmarker(c, jeb); 4699c261b33SJoe Perches jffs2_dbg(2, "jffs_check_nand_cleanmarker returned %d\n", ret); 470a7a6ace1SArtem Bityutskiy 4711da177e4SLinus Torvalds /* Even if it's not found, we still scan to see 4721da177e4SLinus Torvalds if the block is empty. We use this information 4731da177e4SLinus Torvalds to decide whether to erase it or not. */ 4741da177e4SLinus Torvalds switch (ret) { 4751da177e4SLinus Torvalds case 0: cleanmarkerfound = 1; break; 4761da177e4SLinus Torvalds case 1: break; 4771da177e4SLinus Torvalds default: return ret; 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds #endif 481e631ddbaSFerenc Havasi 482e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 4839641b784SDavid Woodhouse struct jffs2_sum_marker *sm; 4849641b784SDavid Woodhouse void *sumptr = NULL; 4859641b784SDavid Woodhouse uint32_t sumlen; 486e631ddbaSFerenc Havasi 4879641b784SDavid Woodhouse if (!buf_size) { 4889641b784SDavid Woodhouse /* XIP case. Just look, point at the summary if it's there */ 48913ba42dfSDavid Woodhouse sm = (void *)buf + c->sector_size - sizeof(*sm); 490e631ddbaSFerenc Havasi if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 4919641b784SDavid Woodhouse sumptr = buf + je32_to_cpu(sm->offset); 4929641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 4939641b784SDavid Woodhouse } 4949641b784SDavid Woodhouse } else { 4959641b784SDavid Woodhouse /* If NAND flash, read a whole page of it. Else just the end */ 4969641b784SDavid Woodhouse if (c->wbuf_pagesize) 4979641b784SDavid Woodhouse buf_len = c->wbuf_pagesize; 4989641b784SDavid Woodhouse else 4999641b784SDavid Woodhouse buf_len = sizeof(*sm); 5009641b784SDavid Woodhouse 5019641b784SDavid Woodhouse /* Read as much as we want into the _end_ of the preallocated buffer */ 5029641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, 5039641b784SDavid Woodhouse jeb->offset + c->sector_size - buf_len, 5049641b784SDavid Woodhouse buf_len); 5059641b784SDavid Woodhouse if (err) 5069641b784SDavid Woodhouse return err; 5079641b784SDavid Woodhouse 5089641b784SDavid Woodhouse sm = (void *)buf + buf_size - sizeof(*sm); 5099641b784SDavid Woodhouse if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) { 5109641b784SDavid Woodhouse sumlen = c->sector_size - je32_to_cpu(sm->offset); 5119641b784SDavid Woodhouse sumptr = buf + buf_size - sumlen; 5129641b784SDavid Woodhouse 513164c2406SChen Jie /* sm->offset maybe wrong but MAGIC maybe right */ 514164c2406SChen Jie if (sumlen > c->sector_size) 515164c2406SChen Jie goto full_scan; 516164c2406SChen Jie 5179641b784SDavid Woodhouse /* Now, make sure the summary itself is available */ 5189641b784SDavid Woodhouse if (sumlen > buf_size) { 5199641b784SDavid Woodhouse /* Need to kmalloc for this. */ 5209641b784SDavid Woodhouse sumptr = kmalloc(sumlen, GFP_KERNEL); 5219641b784SDavid Woodhouse if (!sumptr) 5229641b784SDavid Woodhouse return -ENOMEM; 5239641b784SDavid Woodhouse memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len); 5249641b784SDavid Woodhouse } 5259641b784SDavid Woodhouse if (buf_len < sumlen) { 5269641b784SDavid Woodhouse /* Need to read more so that the entire summary node is present */ 5279641b784SDavid Woodhouse err = jffs2_fill_scan_buf(c, sumptr, 5289641b784SDavid Woodhouse jeb->offset + c->sector_size - sumlen, 5299641b784SDavid Woodhouse sumlen - buf_len); 5309641b784SDavid Woodhouse if (err) 531e631ddbaSFerenc Havasi return err; 532e631ddbaSFerenc Havasi } 533e631ddbaSFerenc Havasi } 534e631ddbaSFerenc Havasi 5359641b784SDavid Woodhouse } 5369641b784SDavid Woodhouse 5379641b784SDavid Woodhouse if (sumptr) { 5389641b784SDavid Woodhouse err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random); 5393560160aSDavid Woodhouse 5409641b784SDavid Woodhouse if (buf_size && sumlen > buf_size) 5419641b784SDavid Woodhouse kfree(sumptr); 5423560160aSDavid Woodhouse /* If it returns with a real error, bail. 5433560160aSDavid Woodhouse If it returns positive, that's a block classification 5443560160aSDavid Woodhouse (i.e. BLK_STATE_xxx) so return that too. 5453560160aSDavid Woodhouse If it returns zero, fall through to full scan. */ 5463560160aSDavid Woodhouse if (err) 5473560160aSDavid Woodhouse return err; 5489641b784SDavid Woodhouse } 549e631ddbaSFerenc Havasi } 550e631ddbaSFerenc Havasi 551164c2406SChen Jie full_scan: 5521da177e4SLinus Torvalds buf_ofs = jeb->offset; 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds if (!buf_size) { 5559641b784SDavid Woodhouse /* This is the XIP case -- we're reading _directly_ from the flash chip */ 5561da177e4SLinus Torvalds buf_len = c->sector_size; 5571da177e4SLinus Torvalds } else { 5583be36675SAndrew Victor buf_len = EMPTY_SCAN_SIZE(c->sector_size); 5591da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len); 5601da177e4SLinus Torvalds if (err) 5611da177e4SLinus Torvalds return err; 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ 5651da177e4SLinus Torvalds ofs = 0; 56641bdc602SJoakim Tjernlund max_ofs = EMPTY_SCAN_SIZE(c->sector_size); 56741bdc602SJoakim Tjernlund /* Scan only EMPTY_SCAN_SIZE of 0xFF before declaring it's empty */ 56841bdc602SJoakim Tjernlund while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF) 5691da177e4SLinus Torvalds ofs += 4; 5701da177e4SLinus Torvalds 57141bdc602SJoakim Tjernlund if (ofs == max_ofs) { 5722f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 5731da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) { 5741da177e4SLinus Torvalds /* scan oob, take care of cleanmarker */ 5751da177e4SLinus Torvalds int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound); 5769c261b33SJoe Perches jffs2_dbg(2, "jffs2_check_oob_empty returned %d\n", 5779c261b33SJoe Perches ret); 5781da177e4SLinus Torvalds switch (ret) { 5791da177e4SLinus Torvalds case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF; 5801da177e4SLinus Torvalds case 1: return BLK_STATE_ALLDIRTY; 5811da177e4SLinus Torvalds default: return ret; 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds #endif 5859c261b33SJoe Perches jffs2_dbg(1, "Block at 0x%08x is empty (erased)\n", 5869c261b33SJoe Perches jeb->offset); 5878f15fd55SAndrew Victor if (c->cleanmarker_size == 0) 5888f15fd55SAndrew Victor return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */ 5898f15fd55SAndrew Victor else 5901da177e4SLinus Torvalds return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */ 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds if (ofs) { 5939c261b33SJoe Perches jffs2_dbg(1, "Free space at %08x ends at %08x\n", jeb->offset, 5949c261b33SJoe Perches jeb->offset + ofs); 595a6a8bef7SDavid Woodhouse if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1))) 596a6a8bef7SDavid Woodhouse return err; 59768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, ofs))) 59868270995SDavid Woodhouse return err; 5991da177e4SLinus Torvalds } 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds /* Now ofs is a complete physical flash offset as it always was... */ 6021da177e4SLinus Torvalds ofs += jeb->offset; 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds noise = 10; 6051da177e4SLinus Torvalds 606733802d9SArtem B. Bityutskiy dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset); 607e631ddbaSFerenc Havasi 6081da177e4SLinus Torvalds scan_more: 6091da177e4SLinus Torvalds while(ofs < jeb->offset + c->sector_size) { 6101da177e4SLinus Torvalds 611e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 6121da177e4SLinus Torvalds 6132f785402SDavid Woodhouse /* Make sure there are node refs available for use */ 614046b8b98SDavid Woodhouse err = jffs2_prealloc_raw_node_refs(c, jeb, 2); 6152f785402SDavid Woodhouse if (err) 6162f785402SDavid Woodhouse return err; 6172f785402SDavid Woodhouse 6181da177e4SLinus Torvalds cond_resched(); 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds if (ofs & 3) { 621da320f05SJoe Perches pr_warn("Eep. ofs 0x%08x not word-aligned!\n", ofs); 6221da177e4SLinus Torvalds ofs = PAD(ofs); 6231da177e4SLinus Torvalds continue; 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds if (ofs == prevofs) { 626da320f05SJoe Perches pr_warn("ofs 0x%08x has already been seen. Skipping\n", 627da320f05SJoe Perches ofs); 62868270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 62968270995SDavid Woodhouse return err; 6301da177e4SLinus Torvalds ofs += 4; 6311da177e4SLinus Torvalds continue; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds prevofs = ofs; 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds if (jeb->offset + c->sector_size < ofs + sizeof(*node)) { 6369c261b33SJoe Perches jffs2_dbg(1, "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", 6379c261b33SJoe Perches sizeof(struct jffs2_unknown_node), 6389c261b33SJoe Perches jeb->offset, c->sector_size, ofs, 6399c261b33SJoe Perches sizeof(*node)); 64068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs))) 64168270995SDavid Woodhouse return err; 6421da177e4SLinus Torvalds break; 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(*node)) { 6461da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 6479c261b33SJoe Perches jffs2_dbg(1, "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n", 6489c261b33SJoe Perches sizeof(struct jffs2_unknown_node), 6499c261b33SJoe Perches buf_len, ofs); 6501da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 6511da177e4SLinus Torvalds if (err) 6521da177e4SLinus Torvalds return err; 6531da177e4SLinus Torvalds buf_ofs = ofs; 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs]; 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { 6591da177e4SLinus Torvalds uint32_t inbuf_ofs; 660c2aecda7SJoakim Tjernlund uint32_t empty_start, scan_end; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds empty_start = ofs; 6631da177e4SLinus Torvalds ofs += 4; 664c2aecda7SJoakim Tjernlund scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len); 6651da177e4SLinus Torvalds 6669c261b33SJoe Perches jffs2_dbg(1, "Found empty flash at 0x%08x\n", ofs); 6671da177e4SLinus Torvalds more_empty: 6681da177e4SLinus Torvalds inbuf_ofs = ofs - buf_ofs; 669c2aecda7SJoakim Tjernlund while (inbuf_ofs < scan_end) { 670c2aecda7SJoakim Tjernlund if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) { 671da320f05SJoe Perches pr_warn("Empty flash at 0x%08x ends at 0x%08x\n", 6721da177e4SLinus Torvalds empty_start, ofs); 67368270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) 67468270995SDavid Woodhouse return err; 6751da177e4SLinus Torvalds goto scan_more; 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds inbuf_ofs+=4; 6791da177e4SLinus Torvalds ofs += 4; 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds /* Ran off end. */ 6829c261b33SJoe Perches jffs2_dbg(1, "Empty flash to end of buffer at 0x%08x\n", 6839c261b33SJoe Perches ofs); 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds /* If we're only checking the beginning of a block with a cleanmarker, 6861da177e4SLinus Torvalds bail now */ 6871da177e4SLinus Torvalds if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) && 68899988f7bSDavid Woodhouse c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) { 6899c261b33SJoe Perches jffs2_dbg(1, "%d bytes at start of block seems clean... assuming all clean\n", 6909c261b33SJoe Perches EMPTY_SCAN_SIZE(c->sector_size)); 6911da177e4SLinus Torvalds return BLK_STATE_CLEANMARKER; 6921da177e4SLinus Torvalds } 693c2aecda7SJoakim Tjernlund if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */ 694c2aecda7SJoakim Tjernlund scan_end = buf_len; 695c2aecda7SJoakim Tjernlund goto more_empty; 696c2aecda7SJoakim Tjernlund } 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds /* See how much more there is to read in this eraseblock... */ 6991da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 7001da177e4SLinus Torvalds if (!buf_len) { 7011da177e4SLinus Torvalds /* No more to read. Break out of main loop without marking 7021da177e4SLinus Torvalds this range of empty space as dirty (because it's not) */ 7039c261b33SJoe Perches jffs2_dbg(1, "Empty flash at %08x runs to end of block. Treating as free_space\n", 7049c261b33SJoe Perches empty_start); 7051da177e4SLinus Torvalds break; 7061da177e4SLinus Torvalds } 707c2aecda7SJoakim Tjernlund /* point never reaches here */ 708c2aecda7SJoakim Tjernlund scan_end = buf_len; 7099c261b33SJoe Perches jffs2_dbg(1, "Reading another 0x%x at 0x%08x\n", 7109c261b33SJoe Perches buf_len, ofs); 7111da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 7121da177e4SLinus Torvalds if (err) 7131da177e4SLinus Torvalds return err; 7141da177e4SLinus Torvalds buf_ofs = ofs; 7151da177e4SLinus Torvalds goto more_empty; 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) { 719da320f05SJoe Perches pr_warn("Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", 720da320f05SJoe Perches ofs); 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 if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) { 7279c261b33SJoe Perches jffs2_dbg(1, "Dirty bitmask at 0x%08x\n", ofs); 72868270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 72968270995SDavid Woodhouse return err; 7301da177e4SLinus Torvalds ofs += 4; 7311da177e4SLinus Torvalds continue; 7321da177e4SLinus Torvalds } 7331da177e4SLinus Torvalds if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) { 734da320f05SJoe Perches pr_warn("Old JFFS2 bitmask found at 0x%08x\n", ofs); 735da320f05SJoe Perches pr_warn("You cannot use older JFFS2 filesystems with newer kernels\n"); 73668270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 73768270995SDavid Woodhouse return err; 7381da177e4SLinus Torvalds ofs += 4; 7391da177e4SLinus Torvalds continue; 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) { 7421da177e4SLinus Torvalds /* OK. We're out of possibilities. Whinge and move on */ 743da320f05SJoe Perches noisy_printk(&noise, "%s(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", 744da320f05SJoe Perches __func__, 7451da177e4SLinus Torvalds JFFS2_MAGIC_BITMASK, ofs, 7461da177e4SLinus Torvalds je16_to_cpu(node->magic)); 74768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 74868270995SDavid Woodhouse return err; 7491da177e4SLinus Torvalds ofs += 4; 7501da177e4SLinus Torvalds continue; 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds /* We seem to have a node of sorts. Check the CRC */ 7531da177e4SLinus Torvalds crcnode.magic = node->magic; 7541da177e4SLinus Torvalds crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE); 7551da177e4SLinus Torvalds crcnode.totlen = node->totlen; 7561da177e4SLinus Torvalds hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4); 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds if (hdr_crc != je32_to_cpu(node->hdr_crc)) { 759da320f05SJoe Perches noisy_printk(&noise, "%s(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n", 760da320f05SJoe Perches __func__, 7611da177e4SLinus Torvalds ofs, je16_to_cpu(node->magic), 7621da177e4SLinus Torvalds je16_to_cpu(node->nodetype), 7631da177e4SLinus Torvalds je32_to_cpu(node->totlen), 7641da177e4SLinus Torvalds je32_to_cpu(node->hdr_crc), 7651da177e4SLinus Torvalds hdr_crc); 76668270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 76768270995SDavid Woodhouse return err; 7681da177e4SLinus Torvalds ofs += 4; 7691da177e4SLinus Torvalds continue; 7701da177e4SLinus Torvalds } 7711da177e4SLinus Torvalds 7720dec4c8bSJoakim Tjernlund if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) { 7731da177e4SLinus Torvalds /* Eep. Node goes over the end of the erase block. */ 774da320f05SJoe Perches pr_warn("Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", 7751da177e4SLinus Torvalds ofs, je32_to_cpu(node->totlen)); 776da320f05SJoe Perches pr_warn("Perhaps the file system was created with the wrong erase size?\n"); 77768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, 4))) 77868270995SDavid Woodhouse return err; 7791da177e4SLinus Torvalds ofs += 4; 7801da177e4SLinus Torvalds continue; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) { 7841da177e4SLinus Torvalds /* Wheee. This is an obsoleted node */ 7859c261b33SJoe Perches jffs2_dbg(2, "Node at 0x%08x is obsolete. Skipping\n", 7869c261b33SJoe Perches ofs); 78768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 78868270995SDavid Woodhouse return err; 7891da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 7901da177e4SLinus Torvalds continue; 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds switch(je16_to_cpu(node->nodetype)) { 7941da177e4SLinus Torvalds case JFFS2_NODETYPE_INODE: 7951da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) { 7961da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 7979c261b33SJoe Perches jffs2_dbg(1, "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n", 7989c261b33SJoe Perches sizeof(struct jffs2_raw_inode), 7999c261b33SJoe Perches buf_len, ofs); 8001da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 8011da177e4SLinus Torvalds if (err) 8021da177e4SLinus Torvalds return err; 8031da177e4SLinus Torvalds buf_ofs = ofs; 8041da177e4SLinus Torvalds node = (void *)buf; 8051da177e4SLinus Torvalds } 806e631ddbaSFerenc Havasi err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s); 8071da177e4SLinus Torvalds if (err) return err; 8081da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8091da177e4SLinus Torvalds break; 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvalds case JFFS2_NODETYPE_DIRENT: 8121da177e4SLinus Torvalds if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 8131da177e4SLinus Torvalds buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 8149c261b33SJoe Perches jffs2_dbg(1, "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n", 8159c261b33SJoe Perches je32_to_cpu(node->totlen), buf_len, 8169c261b33SJoe Perches ofs); 8171da177e4SLinus Torvalds err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 8181da177e4SLinus Torvalds if (err) 8191da177e4SLinus Torvalds return err; 8201da177e4SLinus Torvalds buf_ofs = ofs; 8211da177e4SLinus Torvalds node = (void *)buf; 8221da177e4SLinus Torvalds } 823e631ddbaSFerenc Havasi err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s); 8241da177e4SLinus Torvalds if (err) return err; 8251da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8261da177e4SLinus Torvalds break; 8271da177e4SLinus Torvalds 828aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_XATTR 829aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XATTR: 830aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 831aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 8329c261b33SJoe Perches jffs2_dbg(1, "Fewer than %d bytes (xattr node) left to end of buf. Reading 0x%x at 0x%08x\n", 8339c261b33SJoe Perches je32_to_cpu(node->totlen), buf_len, 8349c261b33SJoe Perches ofs); 835aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 836aa98d7cfSKaiGai Kohei if (err) 837aa98d7cfSKaiGai Kohei return err; 838aa98d7cfSKaiGai Kohei buf_ofs = ofs; 839aa98d7cfSKaiGai Kohei node = (void *)buf; 840aa98d7cfSKaiGai Kohei } 841aa98d7cfSKaiGai Kohei err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s); 842aa98d7cfSKaiGai Kohei if (err) 843aa98d7cfSKaiGai Kohei return err; 844aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 845aa98d7cfSKaiGai Kohei break; 846aa98d7cfSKaiGai Kohei case JFFS2_NODETYPE_XREF: 847aa98d7cfSKaiGai Kohei if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) { 848aa98d7cfSKaiGai Kohei buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); 8499c261b33SJoe Perches jffs2_dbg(1, "Fewer than %d bytes (xref node) left to end of buf. Reading 0x%x at 0x%08x\n", 8509c261b33SJoe Perches je32_to_cpu(node->totlen), buf_len, 8519c261b33SJoe Perches ofs); 852aa98d7cfSKaiGai Kohei err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); 853aa98d7cfSKaiGai Kohei if (err) 854aa98d7cfSKaiGai Kohei return err; 855aa98d7cfSKaiGai Kohei buf_ofs = ofs; 856aa98d7cfSKaiGai Kohei node = (void *)buf; 857aa98d7cfSKaiGai Kohei } 858aa98d7cfSKaiGai Kohei err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s); 859aa98d7cfSKaiGai Kohei if (err) 860aa98d7cfSKaiGai Kohei return err; 861aa98d7cfSKaiGai Kohei ofs += PAD(je32_to_cpu(node->totlen)); 862aa98d7cfSKaiGai Kohei break; 863aa98d7cfSKaiGai Kohei #endif /* CONFIG_JFFS2_FS_XATTR */ 864aa98d7cfSKaiGai Kohei 8651da177e4SLinus Torvalds case JFFS2_NODETYPE_CLEANMARKER: 8669c261b33SJoe Perches jffs2_dbg(1, "CLEANMARKER node found at 0x%08x\n", ofs); 8671da177e4SLinus Torvalds if (je32_to_cpu(node->totlen) != c->cleanmarker_size) { 868da320f05SJoe Perches pr_notice("CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n", 869da320f05SJoe Perches ofs, je32_to_cpu(node->totlen), 870da320f05SJoe Perches c->cleanmarker_size); 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 if (jeb->first_node) { 875da320f05SJoe Perches pr_notice("CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", 876da320f05SJoe Perches ofs, jeb->offset); 87768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node))))) 87868270995SDavid Woodhouse return err; 8791da177e4SLinus Torvalds ofs += PAD(sizeof(struct jffs2_unknown_node)); 8801da177e4SLinus Torvalds } else { 8812f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL); 882f1f9671bSDavid Woodhouse 8831da177e4SLinus Torvalds ofs += PAD(c->cleanmarker_size); 8841da177e4SLinus Torvalds } 8851da177e4SLinus Torvalds break; 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds case JFFS2_NODETYPE_PADDING: 888e631ddbaSFerenc Havasi if (jffs2_sum_active()) 889e631ddbaSFerenc Havasi jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen)); 89068270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 89168270995SDavid Woodhouse return err; 8921da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 8931da177e4SLinus Torvalds break; 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds default: 8961da177e4SLinus Torvalds switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) { 8971da177e4SLinus Torvalds case JFFS2_FEATURE_ROCOMPAT: 898da320f05SJoe Perches pr_notice("Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", 899da320f05SJoe Perches je16_to_cpu(node->nodetype), ofs); 9001da177e4SLinus Torvalds c->flags |= JFFS2_SB_FLAG_RO; 9011da177e4SLinus Torvalds if (!(jffs2_is_readonly(c))) 9021da177e4SLinus Torvalds return -EROFS; 90368270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 90468270995SDavid Woodhouse return err; 9051da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 9061da177e4SLinus Torvalds break; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds case JFFS2_FEATURE_INCOMPAT: 909da320f05SJoe Perches pr_notice("Incompatible feature node (0x%04x) found at offset 0x%08x\n", 910da320f05SJoe Perches je16_to_cpu(node->nodetype), ofs); 9111da177e4SLinus Torvalds return -EINVAL; 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds case JFFS2_FEATURE_RWCOMPAT_DELETE: 9149c261b33SJoe Perches jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", 9159c261b33SJoe Perches je16_to_cpu(node->nodetype), ofs); 91668270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen))))) 91768270995SDavid Woodhouse return err; 9181da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 9191da177e4SLinus Torvalds break; 9201da177e4SLinus Torvalds 9216171586aSDavid Woodhouse case JFFS2_FEATURE_RWCOMPAT_COPY: { 9229c261b33SJoe Perches jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", 9239c261b33SJoe Perches je16_to_cpu(node->nodetype), ofs); 9246171586aSDavid Woodhouse 9252f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL); 9266171586aSDavid Woodhouse 9276171586aSDavid Woodhouse /* We can't summarise nodes we don't grok */ 9286171586aSDavid Woodhouse jffs2_sum_disable_collecting(s); 9291da177e4SLinus Torvalds ofs += PAD(je32_to_cpu(node->totlen)); 9301da177e4SLinus Torvalds break; 9311da177e4SLinus Torvalds } 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds } 9346171586aSDavid Woodhouse } 9351da177e4SLinus Torvalds 936e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 937e631ddbaSFerenc Havasi if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) { 938733802d9SArtem B. Bityutskiy dbg_summary("There is not enough space for " 939e631ddbaSFerenc Havasi "summary information, disabling for this jeb!\n"); 940e631ddbaSFerenc Havasi jffs2_sum_disable_collecting(s); 941e631ddbaSFerenc Havasi } 942e631ddbaSFerenc Havasi } 9431da177e4SLinus Torvalds 9449c261b33SJoe Perches jffs2_dbg(1, "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n", 9459c261b33SJoe Perches jeb->offset, jeb->free_size, jeb->dirty_size, 9469c261b33SJoe Perches jeb->unchecked_size, jeb->used_size, jeb->wasted_size); 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds /* mark_node_obsolete can add to wasted !! */ 9491da177e4SLinus Torvalds if (jeb->wasted_size) { 9501da177e4SLinus Torvalds jeb->dirty_size += jeb->wasted_size; 9511da177e4SLinus Torvalds c->dirty_size += jeb->wasted_size; 9521da177e4SLinus Torvalds c->wasted_size -= jeb->wasted_size; 9531da177e4SLinus Torvalds jeb->wasted_size = 0; 9541da177e4SLinus Torvalds } 9551da177e4SLinus Torvalds 956e631ddbaSFerenc Havasi return jffs2_scan_classify_jeb(c, jeb); 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 959e631ddbaSFerenc Havasi struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino) 9601da177e4SLinus Torvalds { 9611da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 9621da177e4SLinus Torvalds 9631da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 9641da177e4SLinus Torvalds if (ic) 9651da177e4SLinus Torvalds return ic; 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds if (ino > c->highest_ino) 9681da177e4SLinus Torvalds c->highest_ino = ino; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds ic = jffs2_alloc_inode_cache(); 9711da177e4SLinus Torvalds if (!ic) { 972da320f05SJoe Perches pr_notice("%s(): allocation of inode cache failed\n", __func__); 9731da177e4SLinus Torvalds return NULL; 9741da177e4SLinus Torvalds } 9751da177e4SLinus Torvalds memset(ic, 0, sizeof(*ic)); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds ic->ino = ino; 9781da177e4SLinus Torvalds ic->nodes = (void *)ic; 9791da177e4SLinus Torvalds jffs2_add_ino_cache(c, ic); 9801da177e4SLinus Torvalds if (ino == 1) 98127c72b04SDavid Woodhouse ic->pino_nlink = 1; 9821da177e4SLinus Torvalds return ic; 9831da177e4SLinus Torvalds } 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 986e631ddbaSFerenc Havasi struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) 9871da177e4SLinus Torvalds { 9881da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 98953043002SThomas Gleixner uint32_t crc, ino = je32_to_cpu(ri->ino); 9901da177e4SLinus Torvalds 9919c261b33SJoe Perches jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs); 9921da177e4SLinus Torvalds 9931da177e4SLinus Torvalds /* We do very little here now. Just check the ino# to which we should attribute 9941da177e4SLinus Torvalds this node; we can do all the CRC checking etc. later. There's a tradeoff here -- 9951da177e4SLinus Torvalds we used to scan the flash once only, reading everything we want from it into 9961da177e4SLinus Torvalds memory, then building all our in-core data structures and freeing the extra 9971da177e4SLinus Torvalds information. Now we allow the first part of the mount to complete a lot quicker, 9981da177e4SLinus Torvalds but we have to go _back_ to the flash in order to finish the CRC checking, etc. 9991da177e4SLinus Torvalds Which means that the _full_ amount of time to get to proper write mode with GC 10001da177e4SLinus Torvalds operational may actually be _longer_ than before. Sucks to be me. */ 10011da177e4SLinus Torvalds 100253043002SThomas Gleixner /* Check the node CRC in any case. */ 100353043002SThomas Gleixner crc = crc32(0, ri, sizeof(*ri)-8); 100453043002SThomas Gleixner if (crc != je32_to_cpu(ri->node_crc)) { 1005da320f05SJoe Perches pr_notice("%s(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 1006da320f05SJoe Perches __func__, ofs, je32_to_cpu(ri->node_crc), crc); 100753043002SThomas Gleixner /* 100853043002SThomas Gleixner * We believe totlen because the CRC on the node 100953043002SThomas Gleixner * _header_ was OK, just the node itself failed. 101053043002SThomas Gleixner */ 101153043002SThomas Gleixner return jffs2_scan_dirty_space(c, jeb, 101253043002SThomas Gleixner PAD(je32_to_cpu(ri->totlen))); 101353043002SThomas Gleixner } 101453043002SThomas Gleixner 10151da177e4SLinus Torvalds ic = jffs2_get_ino_cache(c, ino); 10161da177e4SLinus Torvalds if (!ic) { 10171da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, ino); 10182f785402SDavid Woodhouse if (!ic) 10191da177e4SLinus Torvalds return -ENOMEM; 10201da177e4SLinus Torvalds } 10211da177e4SLinus Torvalds 10221da177e4SLinus Torvalds /* Wheee. It worked */ 10232f785402SDavid Woodhouse jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic); 10241da177e4SLinus Torvalds 10259c261b33SJoe Perches jffs2_dbg(1, "Node is ino #%u, version %d. Range 0x%x-0x%x\n", 10261da177e4SLinus Torvalds je32_to_cpu(ri->ino), je32_to_cpu(ri->version), 10271da177e4SLinus Torvalds je32_to_cpu(ri->offset), 10289c261b33SJoe Perches je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize)); 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds pseudo_random += je32_to_cpu(ri->version); 10311da177e4SLinus Torvalds 1032e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1033e631ddbaSFerenc Havasi jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); 1034e631ddbaSFerenc Havasi } 1035e631ddbaSFerenc Havasi 10361da177e4SLinus Torvalds return 0; 10371da177e4SLinus Torvalds } 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 1040e631ddbaSFerenc Havasi struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) 10411da177e4SLinus Torvalds { 10421da177e4SLinus Torvalds struct jffs2_full_dirent *fd; 10431da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 1044b534e70cSDavid Woodhouse uint32_t checkedlen; 10451da177e4SLinus Torvalds uint32_t crc; 104668270995SDavid Woodhouse int err; 10471da177e4SLinus Torvalds 10489c261b33SJoe Perches jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs); 10491da177e4SLinus Torvalds 10501da177e4SLinus Torvalds /* We don't get here unless the node is still valid, so we don't have to 10511da177e4SLinus Torvalds mask in the ACCURATE bit any more. */ 10521da177e4SLinus Torvalds crc = crc32(0, rd, sizeof(*rd)-8); 10531da177e4SLinus Torvalds 10541da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->node_crc)) { 1055da320f05SJoe Perches pr_notice("%s(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 1056da320f05SJoe Perches __func__, ofs, je32_to_cpu(rd->node_crc), crc); 10571da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ 105868270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) 105968270995SDavid Woodhouse return err; 10601da177e4SLinus Torvalds return 0; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds pseudo_random += je32_to_cpu(rd->version); 10641da177e4SLinus Torvalds 1065b534e70cSDavid Woodhouse /* Should never happen. Did. (OLPC trac #4184)*/ 1066b534e70cSDavid Woodhouse checkedlen = strnlen(rd->name, rd->nsize); 1067b534e70cSDavid Woodhouse if (checkedlen < rd->nsize) { 1068da320f05SJoe Perches pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n", 1069b534e70cSDavid Woodhouse ofs, checkedlen); 1070b534e70cSDavid Woodhouse } 1071b534e70cSDavid Woodhouse fd = jffs2_alloc_full_dirent(checkedlen+1); 10721da177e4SLinus Torvalds if (!fd) { 10731da177e4SLinus Torvalds return -ENOMEM; 10741da177e4SLinus Torvalds } 1075b534e70cSDavid Woodhouse memcpy(&fd->name, rd->name, checkedlen); 1076b534e70cSDavid Woodhouse fd->name[checkedlen] = 0; 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds crc = crc32(0, fd->name, rd->nsize); 10791da177e4SLinus Torvalds if (crc != je32_to_cpu(rd->name_crc)) { 1080da320f05SJoe Perches pr_notice("%s(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", 1081da320f05SJoe Perches __func__, ofs, je32_to_cpu(rd->name_crc), crc); 10829c261b33SJoe Perches jffs2_dbg(1, "Name for which CRC failed is (now) '%s', ino #%d\n", 10839c261b33SJoe Perches fd->name, je32_to_cpu(rd->ino)); 10841da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10851da177e4SLinus Torvalds /* FIXME: Why do we believe totlen? */ 10861da177e4SLinus Torvalds /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ 108768270995SDavid Woodhouse if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) 108868270995SDavid Woodhouse return err; 10891da177e4SLinus Torvalds return 0; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); 10921da177e4SLinus Torvalds if (!ic) { 10931da177e4SLinus Torvalds jffs2_free_full_dirent(fd); 10941da177e4SLinus Torvalds return -ENOMEM; 10951da177e4SLinus Torvalds } 10961da177e4SLinus Torvalds 109743dfa07fSDavid Woodhouse fd->raw = jffs2_link_node_ref(c, jeb, ofs | dirent_node_state(rd), 109843dfa07fSDavid Woodhouse PAD(je32_to_cpu(rd->totlen)), ic); 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds fd->next = NULL; 11011da177e4SLinus Torvalds fd->version = je32_to_cpu(rd->version); 11021da177e4SLinus Torvalds fd->ino = je32_to_cpu(rd->ino); 11038387ff25SLinus Torvalds fd->nhash = full_name_hash(NULL, fd->name, checkedlen); 11041da177e4SLinus Torvalds fd->type = rd->type; 11051da177e4SLinus Torvalds jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 11061da177e4SLinus Torvalds 1107e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 1108e631ddbaSFerenc Havasi jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); 1109e631ddbaSFerenc Havasi } 1110e631ddbaSFerenc Havasi 11111da177e4SLinus Torvalds return 0; 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds static int count_list(struct list_head *l) 11151da177e4SLinus Torvalds { 11161da177e4SLinus Torvalds uint32_t count = 0; 11171da177e4SLinus Torvalds struct list_head *tmp; 11181da177e4SLinus Torvalds 11191da177e4SLinus Torvalds list_for_each(tmp, l) { 11201da177e4SLinus Torvalds count++; 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds return count; 11231da177e4SLinus Torvalds } 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds /* Note: This breaks if list_empty(head). I don't care. You 11261da177e4SLinus Torvalds might, if you copy this code and use it elsewhere :) */ 11271da177e4SLinus Torvalds static void rotate_list(struct list_head *head, uint32_t count) 11281da177e4SLinus Torvalds { 11291da177e4SLinus Torvalds struct list_head *n = head->next; 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds list_del(head); 11321da177e4SLinus Torvalds while(count--) { 11331da177e4SLinus Torvalds n = n->next; 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds list_add(head, n); 11361da177e4SLinus Torvalds } 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds void jffs2_rotate_lists(struct jffs2_sb_info *c) 11391da177e4SLinus Torvalds { 11401da177e4SLinus Torvalds uint32_t x; 11411da177e4SLinus Torvalds uint32_t rotateby; 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds x = count_list(&c->clean_list); 11441da177e4SLinus Torvalds if (x) { 11451da177e4SLinus Torvalds rotateby = pseudo_random % x; 11461da177e4SLinus Torvalds rotate_list((&c->clean_list), rotateby); 11471da177e4SLinus Torvalds } 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds x = count_list(&c->very_dirty_list); 11501da177e4SLinus Torvalds if (x) { 11511da177e4SLinus Torvalds rotateby = pseudo_random % x; 11521da177e4SLinus Torvalds rotate_list((&c->very_dirty_list), rotateby); 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds x = count_list(&c->dirty_list); 11561da177e4SLinus Torvalds if (x) { 11571da177e4SLinus Torvalds rotateby = pseudo_random % x; 11581da177e4SLinus Torvalds rotate_list((&c->dirty_list), rotateby); 11591da177e4SLinus Torvalds } 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds x = count_list(&c->erasable_list); 11621da177e4SLinus Torvalds if (x) { 11631da177e4SLinus Torvalds rotateby = pseudo_random % x; 11641da177e4SLinus Torvalds rotate_list((&c->erasable_list), rotateby); 11651da177e4SLinus Torvalds } 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds if (c->nr_erasing_blocks) { 11681da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_erasing_blocks; 11691da177e4SLinus Torvalds rotate_list((&c->erase_pending_list), rotateby); 11701da177e4SLinus Torvalds } 11711da177e4SLinus Torvalds 11721da177e4SLinus Torvalds if (c->nr_free_blocks) { 11731da177e4SLinus Torvalds rotateby = pseudo_random % c->nr_free_blocks; 11741da177e4SLinus Torvalds rotate_list((&c->free_list), rotateby); 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds } 1177