11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001-2003 Red Hat, Inc. 51da177e4SLinus Torvalds * Copyright (C) 2004 Thomas Gleixner <tglx@linutronix.de> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Created by David Woodhouse <dwmw2@infradead.org> 81da177e4SLinus Torvalds * Modified debugged and enhanced by Thomas Gleixner <tglx@linutronix.de> 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * For licensing information, see the file 'LICENCE' in this directory. 111da177e4SLinus Torvalds * 12daba5cc4SArtem B. Bityutskiy * $Id: wbuf.c,v 1.100 2005/09/30 13:59:13 dedekind Exp $ 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #include <linux/kernel.h> 171da177e4SLinus Torvalds #include <linux/slab.h> 181da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 191da177e4SLinus Torvalds #include <linux/crc32.h> 201da177e4SLinus Torvalds #include <linux/mtd/nand.h> 214e57b681STim Schmielau #include <linux/jiffies.h> 224e57b681STim Schmielau 231da177e4SLinus Torvalds #include "nodelist.h" 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* For testing write failures */ 261da177e4SLinus Torvalds #undef BREAKME 271da177e4SLinus Torvalds #undef BREAKMEHEADER 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #ifdef BREAKME 301da177e4SLinus Torvalds static unsigned char *brokenbuf; 311da177e4SLinus Torvalds #endif 321da177e4SLinus Torvalds 33daba5cc4SArtem B. Bityutskiy #define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) ) 34daba5cc4SArtem B. Bityutskiy #define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) ) 35daba5cc4SArtem B. Bityutskiy 361da177e4SLinus Torvalds /* max. erase failures before we mark a block bad */ 371da177e4SLinus Torvalds #define MAX_ERASE_FAILURES 2 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds struct jffs2_inodirty { 401da177e4SLinus Torvalds uint32_t ino; 411da177e4SLinus Torvalds struct jffs2_inodirty *next; 421da177e4SLinus Torvalds }; 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds static struct jffs2_inodirty inodirty_nomem; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds static int jffs2_wbuf_pending_for_ino(struct jffs2_sb_info *c, uint32_t ino) 471da177e4SLinus Torvalds { 481da177e4SLinus Torvalds struct jffs2_inodirty *this = c->wbuf_inodes; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds /* If a malloc failed, consider _everything_ dirty */ 511da177e4SLinus Torvalds if (this == &inodirty_nomem) 521da177e4SLinus Torvalds return 1; 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds /* If ino == 0, _any_ non-GC writes mean 'yes' */ 551da177e4SLinus Torvalds if (this && !ino) 561da177e4SLinus Torvalds return 1; 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* Look to see if the inode in question is pending in the wbuf */ 591da177e4SLinus Torvalds while (this) { 601da177e4SLinus Torvalds if (this->ino == ino) 611da177e4SLinus Torvalds return 1; 621da177e4SLinus Torvalds this = this->next; 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds return 0; 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds static void jffs2_clear_wbuf_ino_list(struct jffs2_sb_info *c) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds struct jffs2_inodirty *this; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds this = c->wbuf_inodes; 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds if (this != &inodirty_nomem) { 741da177e4SLinus Torvalds while (this) { 751da177e4SLinus Torvalds struct jffs2_inodirty *next = this->next; 761da177e4SLinus Torvalds kfree(this); 771da177e4SLinus Torvalds this = next; 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds c->wbuf_inodes = NULL; 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds struct jffs2_inodirty *new; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds /* Mark the superblock dirty so that kupdated will flush... */ 884d952709SArtem B. Bityuckiy jffs2_erase_pending_trigger(c); 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds if (jffs2_wbuf_pending_for_ino(c, ino)) 911da177e4SLinus Torvalds return; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds new = kmalloc(sizeof(*new), GFP_KERNEL); 941da177e4SLinus Torvalds if (!new) { 951da177e4SLinus Torvalds D1(printk(KERN_DEBUG "No memory to allocate inodirty. Fallback to all considered dirty\n")); 961da177e4SLinus Torvalds jffs2_clear_wbuf_ino_list(c); 971da177e4SLinus Torvalds c->wbuf_inodes = &inodirty_nomem; 981da177e4SLinus Torvalds return; 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds new->ino = ino; 1011da177e4SLinus Torvalds new->next = c->wbuf_inodes; 1021da177e4SLinus Torvalds c->wbuf_inodes = new; 1031da177e4SLinus Torvalds return; 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds struct list_head *this, *next; 1091da177e4SLinus Torvalds static int n; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds if (list_empty(&c->erasable_pending_wbuf_list)) 1121da177e4SLinus Torvalds return; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds list_for_each_safe(this, next, &c->erasable_pending_wbuf_list) { 1151da177e4SLinus Torvalds struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list); 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Removing eraseblock at 0x%08x from erasable_pending_wbuf_list...\n", jeb->offset)); 1181da177e4SLinus Torvalds list_del(this); 1191da177e4SLinus Torvalds if ((jiffies + (n++)) & 127) { 1201da177e4SLinus Torvalds /* Most of the time, we just erase it immediately. Otherwise we 1211da177e4SLinus Torvalds spend ages scanning it on mount, etc. */ 1221da177e4SLinus Torvalds D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n")); 1231da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->erase_pending_list); 1241da177e4SLinus Torvalds c->nr_erasing_blocks++; 1251da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 1261da177e4SLinus Torvalds } else { 1271da177e4SLinus Torvalds /* Sometimes, however, we leave it elsewhere so it doesn't get 1281da177e4SLinus Torvalds immediately reused, and we spread the load a bit. */ 1291da177e4SLinus Torvalds D1(printk(KERN_DEBUG "...and adding to erasable_list\n")); 1301da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->erasable_list); 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 1357f716cf3SEstelle Hammache #define REFILE_NOTEMPTY 0 1367f716cf3SEstelle Hammache #define REFILE_ANYWAY 1 1377f716cf3SEstelle Hammache 1387f716cf3SEstelle Hammache static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int allow_empty) 1391da177e4SLinus Torvalds { 1401da177e4SLinus Torvalds D1(printk("About to refile bad block at %08x\n", jeb->offset)); 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* File the existing block on the bad_used_list.... */ 1431da177e4SLinus Torvalds if (c->nextblock == jeb) 1441da177e4SLinus Torvalds c->nextblock = NULL; 1451da177e4SLinus Torvalds else /* Not sure this should ever happen... need more coffee */ 1461da177e4SLinus Torvalds list_del(&jeb->list); 1471da177e4SLinus Torvalds if (jeb->first_node) { 1481da177e4SLinus Torvalds D1(printk("Refiling block at %08x to bad_used_list\n", jeb->offset)); 1491da177e4SLinus Torvalds list_add(&jeb->list, &c->bad_used_list); 1501da177e4SLinus Torvalds } else { 1519b88f473SEstelle Hammache BUG_ON(allow_empty == REFILE_NOTEMPTY); 1521da177e4SLinus Torvalds /* It has to have had some nodes or we couldn't be here */ 1531da177e4SLinus Torvalds D1(printk("Refiling block at %08x to erase_pending_list\n", jeb->offset)); 1541da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1551da177e4SLinus Torvalds c->nr_erasing_blocks++; 1561da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1599bfeb691SDavid Woodhouse if (!jffs2_prealloc_raw_node_refs(c, jeb, 1)) { 1609bfeb691SDavid Woodhouse uint32_t oldfree = jeb->free_size; 1619bfeb691SDavid Woodhouse 1629bfeb691SDavid Woodhouse jffs2_link_node_ref(c, jeb, 1639bfeb691SDavid Woodhouse (jeb->offset+c->sector_size-oldfree) | REF_OBSOLETE, 1649bfeb691SDavid Woodhouse oldfree, NULL); 1659bfeb691SDavid Woodhouse /* convert to wasted */ 1669bfeb691SDavid Woodhouse c->wasted_size += oldfree; 1679bfeb691SDavid Woodhouse jeb->wasted_size += oldfree; 1689bfeb691SDavid Woodhouse c->dirty_size -= oldfree; 1699bfeb691SDavid Woodhouse jeb->dirty_size -= oldfree; 1709bfeb691SDavid Woodhouse } 1711da177e4SLinus Torvalds 172e0c8e42fSArtem B. Bityutskiy jffs2_dbg_dump_block_lists_nolock(c); 173e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_sanity_check_nolock(c,jeb); 174e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1779bfeb691SDavid Woodhouse static struct jffs2_raw_node_ref **jffs2_incore_replace_raw(struct jffs2_sb_info *c, 1789bfeb691SDavid Woodhouse struct jffs2_inode_info *f, 1799bfeb691SDavid Woodhouse struct jffs2_raw_node_ref *raw, 1809bfeb691SDavid Woodhouse union jffs2_node_union *node) 1819bfeb691SDavid Woodhouse { 1829bfeb691SDavid Woodhouse struct jffs2_node_frag *frag; 1839bfeb691SDavid Woodhouse struct jffs2_full_dirent *fd; 1849bfeb691SDavid Woodhouse 1859bfeb691SDavid Woodhouse dbg_noderef("incore_replace_raw: node at %p is {%04x,%04x}\n", 1869bfeb691SDavid Woodhouse node, je16_to_cpu(node->u.magic), je16_to_cpu(node->u.nodetype)); 1879bfeb691SDavid Woodhouse 1889bfeb691SDavid Woodhouse BUG_ON(je16_to_cpu(node->u.magic) != 0x1985 && 1899bfeb691SDavid Woodhouse je16_to_cpu(node->u.magic) != 0); 1909bfeb691SDavid Woodhouse 1919bfeb691SDavid Woodhouse switch (je16_to_cpu(node->u.nodetype)) { 1929bfeb691SDavid Woodhouse case JFFS2_NODETYPE_INODE: 193ddc58bd6SDavid Woodhouse if (f->metadata && f->metadata->raw == raw) { 194ddc58bd6SDavid Woodhouse dbg_noderef("Will replace ->raw in f->metadata at %p\n", f->metadata); 195ddc58bd6SDavid Woodhouse return &f->metadata->raw; 196ddc58bd6SDavid Woodhouse } 1979bfeb691SDavid Woodhouse frag = jffs2_lookup_node_frag(&f->fragtree, je32_to_cpu(node->i.offset)); 1989bfeb691SDavid Woodhouse BUG_ON(!frag); 1999bfeb691SDavid Woodhouse /* Find a frag which refers to the full_dnode we want to modify */ 2009bfeb691SDavid Woodhouse while (!frag->node || frag->node->raw != raw) { 2019bfeb691SDavid Woodhouse frag = frag_next(frag); 2029bfeb691SDavid Woodhouse BUG_ON(!frag); 2039bfeb691SDavid Woodhouse } 2049bfeb691SDavid Woodhouse dbg_noderef("Will replace ->raw in full_dnode at %p\n", frag->node); 2059bfeb691SDavid Woodhouse return &frag->node->raw; 2069bfeb691SDavid Woodhouse 2079bfeb691SDavid Woodhouse case JFFS2_NODETYPE_DIRENT: 2089bfeb691SDavid Woodhouse for (fd = f->dents; fd; fd = fd->next) { 2099bfeb691SDavid Woodhouse if (fd->raw == raw) { 2109bfeb691SDavid Woodhouse dbg_noderef("Will replace ->raw in full_dirent at %p\n", fd); 2119bfeb691SDavid Woodhouse return &fd->raw; 2129bfeb691SDavid Woodhouse } 2139bfeb691SDavid Woodhouse } 2149bfeb691SDavid Woodhouse BUG(); 215ddc58bd6SDavid Woodhouse 2169bfeb691SDavid Woodhouse default: 2179bfeb691SDavid Woodhouse dbg_noderef("Don't care about replacing raw for nodetype %x\n", 2189bfeb691SDavid Woodhouse je16_to_cpu(node->u.nodetype)); 2199bfeb691SDavid Woodhouse break; 2209bfeb691SDavid Woodhouse } 2219bfeb691SDavid Woodhouse return NULL; 2229bfeb691SDavid Woodhouse } 2239bfeb691SDavid Woodhouse 2241da177e4SLinus Torvalds /* Recover from failure to write wbuf. Recover the nodes up to the 2251da177e4SLinus Torvalds * wbuf, not the one which we were starting to try to write. */ 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds static void jffs2_wbuf_recover(struct jffs2_sb_info *c) 2281da177e4SLinus Torvalds { 2291da177e4SLinus Torvalds struct jffs2_eraseblock *jeb, *new_jeb; 2309bfeb691SDavid Woodhouse struct jffs2_raw_node_ref *raw, *next, *first_raw = NULL; 2311da177e4SLinus Torvalds size_t retlen; 2321da177e4SLinus Torvalds int ret; 2339bfeb691SDavid Woodhouse int nr_refile = 0; 2341da177e4SLinus Torvalds unsigned char *buf; 2351da177e4SLinus Torvalds uint32_t start, end, ofs, len; 2361da177e4SLinus Torvalds 237046b8b98SDavid Woodhouse jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; 238046b8b98SDavid Woodhouse 2391da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 2407f716cf3SEstelle Hammache jffs2_block_refile(c, jeb, REFILE_NOTEMPTY); 2419bfeb691SDavid Woodhouse spin_unlock(&c->erase_completion_lock); 2429bfeb691SDavid Woodhouse 2439bfeb691SDavid Woodhouse BUG_ON(!ref_obsolete(jeb->last_node)); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* Find the first node to be recovered, by skipping over every 2461da177e4SLinus Torvalds node which ends before the wbuf starts, or which is obsolete. */ 2479bfeb691SDavid Woodhouse for (next = raw = jeb->first_node; next; raw = next) { 2489bfeb691SDavid Woodhouse next = ref_next(raw); 2499bfeb691SDavid Woodhouse 2509bfeb691SDavid Woodhouse if (ref_obsolete(raw) || 2519bfeb691SDavid Woodhouse (next && ref_offset(next) <= c->wbuf_ofs)) { 2529bfeb691SDavid Woodhouse dbg_noderef("Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n", 2539bfeb691SDavid Woodhouse ref_offset(raw), ref_flags(raw), 2549bfeb691SDavid Woodhouse (ref_offset(raw) + ref_totlen(c, jeb, raw)), 2559bfeb691SDavid Woodhouse c->wbuf_ofs); 2569bfeb691SDavid Woodhouse continue; 2579bfeb691SDavid Woodhouse } 2589bfeb691SDavid Woodhouse dbg_noderef("First node to be recovered is at 0x%08x(%d)-0x%08x\n", 2599bfeb691SDavid Woodhouse ref_offset(raw), ref_flags(raw), 2609bfeb691SDavid Woodhouse (ref_offset(raw) + ref_totlen(c, jeb, raw))); 2619bfeb691SDavid Woodhouse 2629bfeb691SDavid Woodhouse first_raw = raw; 2639bfeb691SDavid Woodhouse break; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2669bfeb691SDavid Woodhouse if (!first_raw) { 2671da177e4SLinus Torvalds /* All nodes were obsolete. Nothing to recover. */ 2681da177e4SLinus Torvalds D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n")); 2699bfeb691SDavid Woodhouse c->wbuf_len = 0; 2701da177e4SLinus Torvalds return; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2739bfeb691SDavid Woodhouse start = ref_offset(first_raw); 2749bfeb691SDavid Woodhouse end = ref_offset(jeb->last_node); 2759bfeb691SDavid Woodhouse nr_refile = 1; 2761da177e4SLinus Torvalds 2779bfeb691SDavid Woodhouse /* Count the number of refs which need to be copied */ 2789bfeb691SDavid Woodhouse while ((raw = ref_next(raw)) != jeb->last_node) 2799bfeb691SDavid Woodhouse nr_refile++; 2801da177e4SLinus Torvalds 2819bfeb691SDavid Woodhouse dbg_noderef("wbuf recover %08x-%08x (%d bytes in %d nodes)\n", 2829bfeb691SDavid Woodhouse start, end, end - start, nr_refile); 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds buf = NULL; 2851da177e4SLinus Torvalds if (start < c->wbuf_ofs) { 2861da177e4SLinus Torvalds /* First affected node was already partially written. 2871da177e4SLinus Torvalds * Attempt to reread the old data into our buffer. */ 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds buf = kmalloc(end - start, GFP_KERNEL); 2901da177e4SLinus Torvalds if (!buf) { 2911da177e4SLinus Torvalds printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n"); 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds goto read_failed; 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds /* Do the read... */ 2971da177e4SLinus Torvalds ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf); 2981da177e4SLinus Torvalds 2999a1fcdfdSThomas Gleixner /* ECC recovered ? */ 3009a1fcdfdSThomas Gleixner if ((ret == -EUCLEAN || ret == -EBADMSG) && 3019a1fcdfdSThomas Gleixner (retlen == c->wbuf_ofs - start)) 3021da177e4SLinus Torvalds ret = 0; 3039a1fcdfdSThomas Gleixner 3041da177e4SLinus Torvalds if (ret || retlen != c->wbuf_ofs - start) { 3051da177e4SLinus Torvalds printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n"); 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds kfree(buf); 3081da177e4SLinus Torvalds buf = NULL; 3091da177e4SLinus Torvalds read_failed: 3109bfeb691SDavid Woodhouse first_raw = ref_next(first_raw); 3119bfeb691SDavid Woodhouse nr_refile--; 3129bfeb691SDavid Woodhouse while (first_raw && ref_obsolete(first_raw)) { 3139bfeb691SDavid Woodhouse first_raw = ref_next(first_raw); 3149bfeb691SDavid Woodhouse nr_refile--; 3159bfeb691SDavid Woodhouse } 3169bfeb691SDavid Woodhouse 3171da177e4SLinus Torvalds /* If this was the only node to be recovered, give up */ 3189bfeb691SDavid Woodhouse if (!first_raw) { 3199bfeb691SDavid Woodhouse c->wbuf_len = 0; 3201da177e4SLinus Torvalds return; 3219bfeb691SDavid Woodhouse } 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds /* It wasn't. Go on and try to recover nodes complete in the wbuf */ 3249bfeb691SDavid Woodhouse start = ref_offset(first_raw); 3259bfeb691SDavid Woodhouse dbg_noderef("wbuf now recover %08x-%08x (%d bytes in %d nodes)\n", 3269bfeb691SDavid Woodhouse start, end, end - start, nr_refile); 3279bfeb691SDavid Woodhouse 3281da177e4SLinus Torvalds } else { 3291da177e4SLinus Torvalds /* Read succeeded. Copy the remaining data from the wbuf */ 3301da177e4SLinus Torvalds memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards. 3341da177e4SLinus Torvalds Either 'buf' contains the data, or we find it in the wbuf */ 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds /* ... and get an allocation of space from a shiny new block instead */ 3379fe4854cSDavid Woodhouse ret = jffs2_reserve_space_gc(c, end-start, &len, JFFS2_SUMMARY_NOSUM_SIZE); 3381da177e4SLinus Torvalds if (ret) { 3391da177e4SLinus Torvalds printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n"); 3401da177e4SLinus Torvalds kfree(buf); 3411da177e4SLinus Torvalds return; 3421da177e4SLinus Torvalds } 3439bfeb691SDavid Woodhouse 3449bfeb691SDavid Woodhouse ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, nr_refile); 3459bfeb691SDavid Woodhouse if (ret) { 3469bfeb691SDavid Woodhouse printk(KERN_WARNING "Failed to allocate node refs for wbuf recovery. Data loss ensues.\n"); 3479bfeb691SDavid Woodhouse kfree(buf); 3489bfeb691SDavid Woodhouse return; 3499bfeb691SDavid Woodhouse } 3509bfeb691SDavid Woodhouse 3519fe4854cSDavid Woodhouse ofs = write_ofs(c); 3529fe4854cSDavid Woodhouse 3531da177e4SLinus Torvalds if (end-start >= c->wbuf_pagesize) { 3547f716cf3SEstelle Hammache /* Need to do another write immediately, but it's possible 3557f716cf3SEstelle Hammache that this is just because the wbuf itself is completely 3567f716cf3SEstelle Hammache full, and there's nothing earlier read back from the 3577f716cf3SEstelle Hammache flash. Hence 'buf' isn't necessarily what we're writing 3587f716cf3SEstelle Hammache from. */ 3597f716cf3SEstelle Hammache unsigned char *rewrite_buf = buf?:c->wbuf; 3601da177e4SLinus Torvalds uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize); 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n", 3631da177e4SLinus Torvalds towrite, ofs)); 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds #ifdef BREAKMEHEADER 3661da177e4SLinus Torvalds static int breakme; 3671da177e4SLinus Torvalds if (breakme++ == 20) { 3681da177e4SLinus Torvalds printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs); 3691da177e4SLinus Torvalds breakme = 0; 3709223a456SThomas Gleixner c->mtd->write(c->mtd, ofs, towrite, &retlen, 3719223a456SThomas Gleixner brokenbuf); 3721da177e4SLinus Torvalds ret = -EIO; 3731da177e4SLinus Torvalds } else 3741da177e4SLinus Torvalds #endif 3759223a456SThomas Gleixner ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, 3769223a456SThomas Gleixner rewrite_buf); 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds if (ret || retlen != towrite) { 3791da177e4SLinus Torvalds /* Argh. We tried. Really we did. */ 3801da177e4SLinus Torvalds printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n"); 3811da177e4SLinus Torvalds kfree(buf); 3821da177e4SLinus Torvalds 3832f785402SDavid Woodhouse if (retlen) 3849bfeb691SDavid Woodhouse jffs2_add_physical_node_ref(c, ofs | REF_OBSOLETE, ref_totlen(c, jeb, first_raw), NULL); 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds return; 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs); 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds c->wbuf_len = (end - start) - towrite; 3911da177e4SLinus Torvalds c->wbuf_ofs = ofs + towrite; 3927f716cf3SEstelle Hammache memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len); 3931da177e4SLinus Torvalds /* Don't muck about with c->wbuf_inodes. False positives are harmless. */ 3941da177e4SLinus Torvalds } else { 3951da177e4SLinus Torvalds /* OK, now we're left with the dregs in whichever buffer we're using */ 3961da177e4SLinus Torvalds if (buf) { 3971da177e4SLinus Torvalds memcpy(c->wbuf, buf, end-start); 3981da177e4SLinus Torvalds } else { 3991da177e4SLinus Torvalds memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start); 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds c->wbuf_ofs = ofs; 4021da177e4SLinus Torvalds c->wbuf_len = end - start; 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */ 4061da177e4SLinus Torvalds new_jeb = &c->blocks[ofs / c->sector_size]; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 4099bfeb691SDavid Woodhouse for (raw = first_raw; raw != jeb->last_node; raw = ref_next(raw)) { 4109bfeb691SDavid Woodhouse uint32_t rawlen = ref_totlen(c, jeb, raw); 4119bfeb691SDavid Woodhouse struct jffs2_inode_cache *ic; 4129bfeb691SDavid Woodhouse struct jffs2_raw_node_ref *new_ref; 4139bfeb691SDavid Woodhouse struct jffs2_raw_node_ref **adjust_ref = NULL; 4149bfeb691SDavid Woodhouse struct jffs2_inode_info *f = NULL; 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n", 4179bfeb691SDavid Woodhouse rawlen, ref_offset(raw), ref_flags(raw), ofs)); 4181da177e4SLinus Torvalds 4199bfeb691SDavid Woodhouse ic = jffs2_raw_ref_to_ic(raw); 4209bfeb691SDavid Woodhouse 4219bfeb691SDavid Woodhouse /* Ick. This XATTR mess should be fixed shortly... */ 4229bfeb691SDavid Woodhouse if (ic && ic->class == RAWNODE_CLASS_XATTR_DATUM) { 4239bfeb691SDavid Woodhouse struct jffs2_xattr_datum *xd = (void *)ic; 4249bfeb691SDavid Woodhouse BUG_ON(xd->node != raw); 4259bfeb691SDavid Woodhouse adjust_ref = &xd->node; 4269bfeb691SDavid Woodhouse raw->next_in_ino = NULL; 4279bfeb691SDavid Woodhouse ic = NULL; 4289bfeb691SDavid Woodhouse } else if (ic && ic->class == RAWNODE_CLASS_XATTR_REF) { 4299bfeb691SDavid Woodhouse struct jffs2_xattr_datum *xr = (void *)ic; 4309bfeb691SDavid Woodhouse BUG_ON(xr->node != raw); 4319bfeb691SDavid Woodhouse adjust_ref = &xr->node; 4329bfeb691SDavid Woodhouse raw->next_in_ino = NULL; 4339bfeb691SDavid Woodhouse ic = NULL; 4349bfeb691SDavid Woodhouse } else if (ic && ic->class == RAWNODE_CLASS_INODE_CACHE) { 4359bfeb691SDavid Woodhouse struct jffs2_raw_node_ref **p = &ic->nodes; 4369bfeb691SDavid Woodhouse 4379bfeb691SDavid Woodhouse /* Remove the old node from the per-inode list */ 4389bfeb691SDavid Woodhouse while (*p && *p != (void *)ic) { 4399bfeb691SDavid Woodhouse if (*p == raw) { 4409bfeb691SDavid Woodhouse (*p) = (raw->next_in_ino); 4419bfeb691SDavid Woodhouse raw->next_in_ino = NULL; 4429bfeb691SDavid Woodhouse break; 4439bfeb691SDavid Woodhouse } 4449bfeb691SDavid Woodhouse p = &((*p)->next_in_ino); 4459bfeb691SDavid Woodhouse } 4469bfeb691SDavid Woodhouse 4479bfeb691SDavid Woodhouse if (ic->state == INO_STATE_PRESENT && !ref_obsolete(raw)) { 4489bfeb691SDavid Woodhouse /* If it's an in-core inode, then we have to adjust any 4499bfeb691SDavid Woodhouse full_dirent or full_dnode structure to point to the 4509bfeb691SDavid Woodhouse new version instead of the old */ 4519bfeb691SDavid Woodhouse f = jffs2_gc_fetch_inode(c, ic->ino, ic->nlink); 4529bfeb691SDavid Woodhouse if (IS_ERR(f)) { 4539bfeb691SDavid Woodhouse /* Should never happen; it _must_ be present */ 4549bfeb691SDavid Woodhouse JFFS2_ERROR("Failed to iget() ino #%u, err %ld\n", 4559bfeb691SDavid Woodhouse ic->ino, PTR_ERR(f)); 4569bfeb691SDavid Woodhouse BUG(); 4579bfeb691SDavid Woodhouse } 4589bfeb691SDavid Woodhouse /* We don't lock f->sem. There's a number of ways we could 4599bfeb691SDavid Woodhouse end up in here with it already being locked, and nobody's 4609bfeb691SDavid Woodhouse going to modify it on us anyway because we hold the 4619bfeb691SDavid Woodhouse alloc_sem. We're only changing one ->raw pointer too, 4629bfeb691SDavid Woodhouse which we can get away with without upsetting readers. */ 4639bfeb691SDavid Woodhouse adjust_ref = jffs2_incore_replace_raw(c, f, raw, 4649bfeb691SDavid Woodhouse (void *)(buf?:c->wbuf) + (ref_offset(raw) - start)); 4659bfeb691SDavid Woodhouse } else if (unlikely(ic->state != INO_STATE_PRESENT && 4669bfeb691SDavid Woodhouse ic->state != INO_STATE_CHECKEDABSENT && 4679bfeb691SDavid Woodhouse ic->state != INO_STATE_GC)) { 4689bfeb691SDavid Woodhouse JFFS2_ERROR("Inode #%u is in strange state %d!\n", ic->ino, ic->state); 4699bfeb691SDavid Woodhouse BUG(); 4709bfeb691SDavid Woodhouse } 4719bfeb691SDavid Woodhouse } 4729bfeb691SDavid Woodhouse 4739bfeb691SDavid Woodhouse new_ref = jffs2_link_node_ref(c, new_jeb, ofs | ref_flags(raw), rawlen, ic); 4749bfeb691SDavid Woodhouse 4759bfeb691SDavid Woodhouse if (adjust_ref) { 4769bfeb691SDavid Woodhouse BUG_ON(*adjust_ref != raw); 4779bfeb691SDavid Woodhouse *adjust_ref = new_ref; 4789bfeb691SDavid Woodhouse } 4799bfeb691SDavid Woodhouse if (f) 4809bfeb691SDavid Woodhouse jffs2_gc_release_inode(c, f); 4819bfeb691SDavid Woodhouse 4829bfeb691SDavid Woodhouse if (!ref_obsolete(raw)) { 4831da177e4SLinus Torvalds jeb->dirty_size += rawlen; 4841da177e4SLinus Torvalds jeb->used_size -= rawlen; 4851da177e4SLinus Torvalds c->dirty_size += rawlen; 4869bfeb691SDavid Woodhouse c->used_size -= rawlen; 4879bfeb691SDavid Woodhouse raw->flash_offset = ref_offset(raw) | REF_OBSOLETE; 4889bfeb691SDavid Woodhouse BUG_ON(raw->next_in_ino); 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds ofs += rawlen; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds 4939bfeb691SDavid Woodhouse kfree(buf); 4949bfeb691SDavid Woodhouse 4951da177e4SLinus Torvalds /* Fix up the original jeb now it's on the bad_list */ 4969bfeb691SDavid Woodhouse if (first_raw == jeb->first_node) { 4971da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset)); 498f116629dSAkinobu Mita list_move(&jeb->list, &c->erase_pending_list); 4991da177e4SLinus Torvalds c->nr_erasing_blocks++; 5001da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 503e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_sanity_check_nolock(c, jeb); 504e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 5051da177e4SLinus Torvalds 506e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_sanity_check_nolock(c, new_jeb); 507e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, new_jeb); 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 5101da177e4SLinus Torvalds 5119bfeb691SDavid Woodhouse D1(printk(KERN_DEBUG "wbuf recovery completed OK. wbuf_ofs 0x%08x, len 0x%x\n", c->wbuf_ofs, c->wbuf_len)); 5129bfeb691SDavid Woodhouse 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds /* Meaning of pad argument: 5161da177e4SLinus Torvalds 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway. 5171da177e4SLinus Torvalds 1: Pad, do not adjust nextblock free_size 5181da177e4SLinus Torvalds 2: Pad, adjust nextblock free_size 5191da177e4SLinus Torvalds */ 5201da177e4SLinus Torvalds #define NOPAD 0 5211da177e4SLinus Torvalds #define PAD_NOACCOUNT 1 5221da177e4SLinus Torvalds #define PAD_ACCOUNTING 2 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad) 5251da177e4SLinus Torvalds { 5269bfeb691SDavid Woodhouse struct jffs2_eraseblock *wbuf_jeb; 5271da177e4SLinus Torvalds int ret; 5281da177e4SLinus Torvalds size_t retlen; 5291da177e4SLinus Torvalds 5303be36675SAndrew Victor /* Nothing to do if not write-buffering the flash. In particular, we shouldn't 5311da177e4SLinus Torvalds del_timer() the timer we never initialised. */ 5323be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 5331da177e4SLinus Torvalds return 0; 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds if (!down_trylock(&c->alloc_sem)) { 5361da177e4SLinus Torvalds up(&c->alloc_sem); 5371da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n"); 5381da177e4SLinus Torvalds BUG(); 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5413be36675SAndrew Victor if (!c->wbuf_len) /* already checked c->wbuf above */ 5421da177e4SLinus Torvalds return 0; 5431da177e4SLinus Torvalds 5449bfeb691SDavid Woodhouse wbuf_jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; 5459bfeb691SDavid Woodhouse if (jffs2_prealloc_raw_node_refs(c, wbuf_jeb, c->nextblock->allocated_refs + 1)) 5462f785402SDavid Woodhouse return -ENOMEM; 5472f785402SDavid Woodhouse 5481da177e4SLinus Torvalds /* claim remaining space on the page 5491da177e4SLinus Torvalds this happens, if we have a change to a new block, 5501da177e4SLinus Torvalds or if fsync forces us to flush the writebuffer. 5511da177e4SLinus Torvalds if we have a switch to next page, we will not have 5521da177e4SLinus Torvalds enough remaining space for this. 5531da177e4SLinus Torvalds */ 554daba5cc4SArtem B. Bityutskiy if (pad ) { 5551da177e4SLinus Torvalds c->wbuf_len = PAD(c->wbuf_len); 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR 5581da177e4SLinus Torvalds with 8 byte page size */ 5591da177e4SLinus Torvalds memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len); 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) { 5621da177e4SLinus Torvalds struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len); 5631da177e4SLinus Torvalds padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 5641da177e4SLinus Torvalds padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING); 5651da177e4SLinus Torvalds padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len); 5661da177e4SLinus Torvalds padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4)); 5671da177e4SLinus Torvalds } 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds /* else jffs2_flash_writev has actually filled in the rest of the 5701da177e4SLinus Torvalds buffer for us, and will deal with the node refs etc. later. */ 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds #ifdef BREAKME 5731da177e4SLinus Torvalds static int breakme; 5741da177e4SLinus Torvalds if (breakme++ == 20) { 5751da177e4SLinus Torvalds printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs); 5761da177e4SLinus Torvalds breakme = 0; 5779223a456SThomas Gleixner c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, 5789223a456SThomas Gleixner brokenbuf); 5791da177e4SLinus Torvalds ret = -EIO; 5801da177e4SLinus Torvalds } else 5811da177e4SLinus Torvalds #endif 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf); 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds if (ret || retlen != c->wbuf_pagesize) { 5861da177e4SLinus Torvalds if (ret) 5871da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret); 5881da177e4SLinus Torvalds else { 5891da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n", 5901da177e4SLinus Torvalds retlen, c->wbuf_pagesize); 5911da177e4SLinus Torvalds ret = -EIO; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds jffs2_wbuf_recover(c); 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds return ret; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds /* Adjust free size of the block if we padded. */ 600daba5cc4SArtem B. Bityutskiy if (pad) { 6010bcc099dSDavid Woodhouse uint32_t waste = c->wbuf_pagesize - c->wbuf_len; 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n", 6049bfeb691SDavid Woodhouse (wbuf_jeb==c->nextblock)?"next":"", wbuf_jeb->offset)); 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds /* wbuf_pagesize - wbuf_len is the amount of space that's to be 6071da177e4SLinus Torvalds padded. If there is less free space in the block than that, 6081da177e4SLinus Torvalds something screwed up */ 6099bfeb691SDavid Woodhouse if (wbuf_jeb->free_size < waste) { 6101da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n", 6110bcc099dSDavid Woodhouse c->wbuf_ofs, c->wbuf_len, waste); 6121da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n", 6139bfeb691SDavid Woodhouse wbuf_jeb->offset, wbuf_jeb->free_size); 6141da177e4SLinus Torvalds BUG(); 6151da177e4SLinus Torvalds } 6160bcc099dSDavid Woodhouse 6170bcc099dSDavid Woodhouse spin_lock(&c->erase_completion_lock); 6180bcc099dSDavid Woodhouse 6199bfeb691SDavid Woodhouse jffs2_link_node_ref(c, wbuf_jeb, (c->wbuf_ofs + c->wbuf_len) | REF_OBSOLETE, waste, NULL); 6200bcc099dSDavid Woodhouse /* FIXME: that made it count as dirty. Convert to wasted */ 6219bfeb691SDavid Woodhouse wbuf_jeb->dirty_size -= waste; 6220bcc099dSDavid Woodhouse c->dirty_size -= waste; 6239bfeb691SDavid Woodhouse wbuf_jeb->wasted_size += waste; 6240bcc099dSDavid Woodhouse c->wasted_size += waste; 6250bcc099dSDavid Woodhouse } else 6260bcc099dSDavid Woodhouse spin_lock(&c->erase_completion_lock); 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds /* Stick any now-obsoleted blocks on the erase_pending_list */ 6291da177e4SLinus Torvalds jffs2_refile_wbuf_blocks(c); 6301da177e4SLinus Torvalds jffs2_clear_wbuf_ino_list(c); 6311da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds memset(c->wbuf,0xff,c->wbuf_pagesize); 6341da177e4SLinus Torvalds /* adjust write buffer offset, else we get a non contiguous write bug */ 6351da177e4SLinus Torvalds c->wbuf_ofs += c->wbuf_pagesize; 6361da177e4SLinus Torvalds c->wbuf_len = 0; 6371da177e4SLinus Torvalds return 0; 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /* Trigger garbage collection to flush the write-buffer. 6411da177e4SLinus Torvalds If ino arg is zero, do it if _any_ real (i.e. not GC) writes are 6421da177e4SLinus Torvalds outstanding. If ino arg non-zero, do it only if a write for the 6431da177e4SLinus Torvalds given inode is outstanding. */ 6441da177e4SLinus Torvalds int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino) 6451da177e4SLinus Torvalds { 6461da177e4SLinus Torvalds uint32_t old_wbuf_ofs; 6471da177e4SLinus Torvalds uint32_t old_wbuf_len; 6481da177e4SLinus Torvalds int ret = 0; 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino)); 6511da177e4SLinus Torvalds 6528aee6ac1SDavid Woodhouse if (!c->wbuf) 6538aee6ac1SDavid Woodhouse return 0; 6548aee6ac1SDavid Woodhouse 6551da177e4SLinus Torvalds down(&c->alloc_sem); 6561da177e4SLinus Torvalds if (!jffs2_wbuf_pending_for_ino(c, ino)) { 6571da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino)); 6581da177e4SLinus Torvalds up(&c->alloc_sem); 6591da177e4SLinus Torvalds return 0; 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds old_wbuf_ofs = c->wbuf_ofs; 6631da177e4SLinus Torvalds old_wbuf_len = c->wbuf_len; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds if (c->unchecked_size) { 6661da177e4SLinus Torvalds /* GC won't make any progress for a while */ 6671da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n")); 6681da177e4SLinus Torvalds down_write(&c->wbuf_sem); 6691da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6707f716cf3SEstelle Hammache /* retry flushing wbuf in case jffs2_wbuf_recover 6717f716cf3SEstelle Hammache left some data in the wbuf */ 6727f716cf3SEstelle Hammache if (ret) 6737f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6741da177e4SLinus Torvalds up_write(&c->wbuf_sem); 6751da177e4SLinus Torvalds } else while (old_wbuf_len && 6761da177e4SLinus Torvalds old_wbuf_ofs == c->wbuf_ofs) { 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds up(&c->alloc_sem); 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n")); 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds ret = jffs2_garbage_collect_pass(c); 6831da177e4SLinus Torvalds if (ret) { 6841da177e4SLinus Torvalds /* GC failed. Flush it with padding instead */ 6851da177e4SLinus Torvalds down(&c->alloc_sem); 6861da177e4SLinus Torvalds down_write(&c->wbuf_sem); 6871da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6887f716cf3SEstelle Hammache /* retry flushing wbuf in case jffs2_wbuf_recover 6897f716cf3SEstelle Hammache left some data in the wbuf */ 6907f716cf3SEstelle Hammache if (ret) 6917f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6921da177e4SLinus Torvalds up_write(&c->wbuf_sem); 6931da177e4SLinus Torvalds break; 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds down(&c->alloc_sem); 6961da177e4SLinus Torvalds } 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n")); 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds up(&c->alloc_sem); 7011da177e4SLinus Torvalds return ret; 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds /* Pad write-buffer to end and write it, wasting space. */ 7051da177e4SLinus Torvalds int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c) 7061da177e4SLinus Torvalds { 7071da177e4SLinus Torvalds int ret; 7081da177e4SLinus Torvalds 7098aee6ac1SDavid Woodhouse if (!c->wbuf) 7108aee6ac1SDavid Woodhouse return 0; 7118aee6ac1SDavid Woodhouse 7121da177e4SLinus Torvalds down_write(&c->wbuf_sem); 7131da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 7147f716cf3SEstelle Hammache /* retry - maybe wbuf recover left some data in wbuf. */ 7157f716cf3SEstelle Hammache if (ret) 7167f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 7171da177e4SLinus Torvalds up_write(&c->wbuf_sem); 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds return ret; 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds 722dcb09328SThomas Gleixner static size_t jffs2_fill_wbuf(struct jffs2_sb_info *c, const uint8_t *buf, 723dcb09328SThomas Gleixner size_t len) 724dcb09328SThomas Gleixner { 725dcb09328SThomas Gleixner if (len && !c->wbuf_len && (len >= c->wbuf_pagesize)) 726dcb09328SThomas Gleixner return 0; 727dcb09328SThomas Gleixner 728dcb09328SThomas Gleixner if (len > (c->wbuf_pagesize - c->wbuf_len)) 729dcb09328SThomas Gleixner len = c->wbuf_pagesize - c->wbuf_len; 730dcb09328SThomas Gleixner memcpy(c->wbuf + c->wbuf_len, buf, len); 731dcb09328SThomas Gleixner c->wbuf_len += (uint32_t) len; 732dcb09328SThomas Gleixner return len; 733dcb09328SThomas Gleixner } 734dcb09328SThomas Gleixner 735dcb09328SThomas Gleixner int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, 736dcb09328SThomas Gleixner unsigned long count, loff_t to, size_t *retlen, 737dcb09328SThomas Gleixner uint32_t ino) 738dcb09328SThomas Gleixner { 739dcb09328SThomas Gleixner struct jffs2_eraseblock *jeb; 740dcb09328SThomas Gleixner size_t wbuf_retlen, donelen = 0; 741dcb09328SThomas Gleixner uint32_t outvec_to = to; 742dcb09328SThomas Gleixner int ret, invec; 743dcb09328SThomas Gleixner 744dcb09328SThomas Gleixner /* If not writebuffered flash, don't bother */ 7453be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 7461da177e4SLinus Torvalds return jffs2_flash_direct_writev(c, invecs, count, to, retlen); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds down_write(&c->wbuf_sem); 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds /* If wbuf_ofs is not initialized, set it to target address */ 7511da177e4SLinus Torvalds if (c->wbuf_ofs == 0xFFFFFFFF) { 7521da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(to); 7531da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 7541da177e4SLinus Torvalds memset(c->wbuf,0xff,c->wbuf_pagesize); 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds 757dcb09328SThomas Gleixner /* 758dcb09328SThomas Gleixner * Sanity checks on target address. It's permitted to write 759dcb09328SThomas Gleixner * at PAD(c->wbuf_len+c->wbuf_ofs), and it's permitted to 760dcb09328SThomas Gleixner * write at the beginning of a new erase block. Anything else, 761dcb09328SThomas Gleixner * and you die. New block starts at xxx000c (0-b = block 762dcb09328SThomas Gleixner * header) 7631da177e4SLinus Torvalds */ 7643be36675SAndrew Victor if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) { 7651da177e4SLinus Torvalds /* It's a write to a new block */ 7661da177e4SLinus Torvalds if (c->wbuf_len) { 767dcb09328SThomas Gleixner D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx " 768dcb09328SThomas Gleixner "causes flush of wbuf at 0x%08x\n", 769dcb09328SThomas Gleixner (unsigned long)to, c->wbuf_ofs)); 7701da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 771dcb09328SThomas Gleixner if (ret) 772dcb09328SThomas Gleixner goto outerr; 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds /* set pointer to new block */ 7751da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(to); 7761da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 7771da177e4SLinus Torvalds } 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds if (to != PAD(c->wbuf_ofs + c->wbuf_len)) { 7801da177e4SLinus Torvalds /* We're not writing immediately after the writebuffer. Bad. */ 781dcb09328SThomas Gleixner printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write " 782dcb09328SThomas Gleixner "to %08lx\n", (unsigned long)to); 7831da177e4SLinus Torvalds if (c->wbuf_len) 7841da177e4SLinus Torvalds printk(KERN_CRIT "wbuf was previously %08x-%08x\n", 7851da177e4SLinus Torvalds c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len); 7861da177e4SLinus Torvalds BUG(); 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds /* adjust alignment offset */ 7901da177e4SLinus Torvalds if (c->wbuf_len != PAGE_MOD(to)) { 7911da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 7921da177e4SLinus Torvalds /* take care of alignment to next page */ 793dcb09328SThomas Gleixner if (!c->wbuf_len) { 7941da177e4SLinus Torvalds c->wbuf_len = c->wbuf_pagesize; 7951da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, NOPAD); 796dcb09328SThomas Gleixner if (ret) 797dcb09328SThomas Gleixner goto outerr; 7981da177e4SLinus Torvalds } 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds 801dcb09328SThomas Gleixner for (invec = 0; invec < count; invec++) { 802dcb09328SThomas Gleixner int vlen = invecs[invec].iov_len; 803dcb09328SThomas Gleixner uint8_t *v = invecs[invec].iov_base; 8041da177e4SLinus Torvalds 805dcb09328SThomas Gleixner wbuf_retlen = jffs2_fill_wbuf(c, v, vlen); 8061da177e4SLinus Torvalds 807dcb09328SThomas Gleixner if (c->wbuf_len == c->wbuf_pagesize) { 808dcb09328SThomas Gleixner ret = __jffs2_flush_wbuf(c, NOPAD); 809dcb09328SThomas Gleixner if (ret) 810dcb09328SThomas Gleixner goto outerr; 8111da177e4SLinus Torvalds } 812dcb09328SThomas Gleixner vlen -= wbuf_retlen; 813dcb09328SThomas Gleixner outvec_to += wbuf_retlen; 8141da177e4SLinus Torvalds donelen += wbuf_retlen; 815dcb09328SThomas Gleixner v += wbuf_retlen; 8161da177e4SLinus Torvalds 817dcb09328SThomas Gleixner if (vlen >= c->wbuf_pagesize) { 818dcb09328SThomas Gleixner ret = c->mtd->write(c->mtd, outvec_to, PAGE_DIV(vlen), 819dcb09328SThomas Gleixner &wbuf_retlen, v); 820dcb09328SThomas Gleixner if (ret < 0 || wbuf_retlen != PAGE_DIV(vlen)) 821dcb09328SThomas Gleixner goto outfile; 822dcb09328SThomas Gleixner 823dcb09328SThomas Gleixner vlen -= wbuf_retlen; 824dcb09328SThomas Gleixner outvec_to += wbuf_retlen; 825dcb09328SThomas Gleixner c->wbuf_ofs = outvec_to; 826dcb09328SThomas Gleixner donelen += wbuf_retlen; 827dcb09328SThomas Gleixner v += wbuf_retlen; 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds 830dcb09328SThomas Gleixner wbuf_retlen = jffs2_fill_wbuf(c, v, vlen); 831dcb09328SThomas Gleixner if (c->wbuf_len == c->wbuf_pagesize) { 832dcb09328SThomas Gleixner ret = __jffs2_flush_wbuf(c, NOPAD); 833dcb09328SThomas Gleixner if (ret) 834dcb09328SThomas Gleixner goto outerr; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 837dcb09328SThomas Gleixner outvec_to += wbuf_retlen; 838dcb09328SThomas Gleixner donelen += wbuf_retlen; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds 841dcb09328SThomas Gleixner /* 842dcb09328SThomas Gleixner * If there's a remainder in the wbuf and it's a non-GC write, 843dcb09328SThomas Gleixner * remember that the wbuf affects this ino 844dcb09328SThomas Gleixner */ 8451da177e4SLinus Torvalds *retlen = donelen; 8461da177e4SLinus Torvalds 847e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 848e631ddbaSFerenc Havasi int res = jffs2_sum_add_kvec(c, invecs, count, (uint32_t) to); 849e631ddbaSFerenc Havasi if (res) 850e631ddbaSFerenc Havasi return res; 851e631ddbaSFerenc Havasi } 852e631ddbaSFerenc Havasi 8531da177e4SLinus Torvalds if (c->wbuf_len && ino) 8541da177e4SLinus Torvalds jffs2_wbuf_dirties_inode(c, ino); 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds ret = 0; 857dcb09328SThomas Gleixner up_write(&c->wbuf_sem); 858dcb09328SThomas Gleixner return ret; 8591da177e4SLinus Torvalds 860dcb09328SThomas Gleixner outfile: 861dcb09328SThomas Gleixner /* 862dcb09328SThomas Gleixner * At this point we have no problem, c->wbuf is empty. However 863dcb09328SThomas Gleixner * refile nextblock to avoid writing again to same address. 864dcb09328SThomas Gleixner */ 865dcb09328SThomas Gleixner 866dcb09328SThomas Gleixner spin_lock(&c->erase_completion_lock); 867dcb09328SThomas Gleixner 868dcb09328SThomas Gleixner jeb = &c->blocks[outvec_to / c->sector_size]; 869dcb09328SThomas Gleixner jffs2_block_refile(c, jeb, REFILE_ANYWAY); 870dcb09328SThomas Gleixner 871dcb09328SThomas Gleixner spin_unlock(&c->erase_completion_lock); 872dcb09328SThomas Gleixner 873dcb09328SThomas Gleixner outerr: 874dcb09328SThomas Gleixner *retlen = 0; 8751da177e4SLinus Torvalds up_write(&c->wbuf_sem); 8761da177e4SLinus Torvalds return ret; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds /* 8801da177e4SLinus Torvalds * This is the entry for flash write. 8811da177e4SLinus Torvalds * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev 8821da177e4SLinus Torvalds */ 8839bfeb691SDavid Woodhouse int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, 8849bfeb691SDavid Woodhouse size_t *retlen, const u_char *buf) 8851da177e4SLinus Torvalds { 8861da177e4SLinus Torvalds struct kvec vecs[1]; 8871da177e4SLinus Torvalds 8883be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 889e631ddbaSFerenc Havasi return jffs2_flash_direct_write(c, ofs, len, retlen, buf); 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds vecs[0].iov_base = (unsigned char *) buf; 8921da177e4SLinus Torvalds vecs[0].iov_len = len; 8931da177e4SLinus Torvalds return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0); 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds /* 8971da177e4SLinus Torvalds Handle readback from writebuffer and ECC failure return 8981da177e4SLinus Torvalds */ 8991da177e4SLinus Torvalds int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf) 9001da177e4SLinus Torvalds { 9011da177e4SLinus Torvalds loff_t orbf = 0, owbf = 0, lwbf = 0; 9021da177e4SLinus Torvalds int ret; 9031da177e4SLinus Torvalds 9043be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 9053be36675SAndrew Victor return c->mtd->read(c->mtd, ofs, len, retlen, buf); 9061da177e4SLinus Torvalds 9073be36675SAndrew Victor /* Read flash */ 908894214d1SArtem B. Bityuckiy down_read(&c->wbuf_sem); 9091da177e4SLinus Torvalds ret = c->mtd->read(c->mtd, ofs, len, retlen, buf); 9101da177e4SLinus Torvalds 9119a1fcdfdSThomas Gleixner if ( (ret == -EBADMSG || ret == -EUCLEAN) && (*retlen == len) ) { 9129a1fcdfdSThomas Gleixner if (ret == -EBADMSG) 9139a1fcdfdSThomas Gleixner printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx)" 9149a1fcdfdSThomas Gleixner " returned ECC error\n", len, ofs); 9151da177e4SLinus Torvalds /* 9169a1fcdfdSThomas Gleixner * We have the raw data without ECC correction in the buffer, 9179a1fcdfdSThomas Gleixner * maybe we are lucky and all data or parts are correct. We 9189a1fcdfdSThomas Gleixner * check the node. If data are corrupted node check will sort 9199a1fcdfdSThomas Gleixner * it out. We keep this block, it will fail on write or erase 9209a1fcdfdSThomas Gleixner * and the we mark it bad. Or should we do that now? But we 9219a1fcdfdSThomas Gleixner * should give him a chance. Maybe we had a system crash or 9229a1fcdfdSThomas Gleixner * power loss before the ecc write or a erase was completed. 9231da177e4SLinus Torvalds * So we return success. :) 9241da177e4SLinus Torvalds */ 9251da177e4SLinus Torvalds ret = 0; 9261da177e4SLinus Torvalds } 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds /* if no writebuffer available or write buffer empty, return */ 9291da177e4SLinus Torvalds if (!c->wbuf_pagesize || !c->wbuf_len) 930894214d1SArtem B. Bityuckiy goto exit; 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds /* if we read in a different block, return */ 9333be36675SAndrew Victor if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs)) 934894214d1SArtem B. Bityuckiy goto exit; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds if (ofs >= c->wbuf_ofs) { 9371da177e4SLinus Torvalds owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */ 9381da177e4SLinus Torvalds if (owbf > c->wbuf_len) /* is read beyond write buffer ? */ 9391da177e4SLinus Torvalds goto exit; 9401da177e4SLinus Torvalds lwbf = c->wbuf_len - owbf; /* number of bytes to copy */ 9411da177e4SLinus Torvalds if (lwbf > len) 9421da177e4SLinus Torvalds lwbf = len; 9431da177e4SLinus Torvalds } else { 9441da177e4SLinus Torvalds orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */ 9451da177e4SLinus Torvalds if (orbf > len) /* is write beyond write buffer ? */ 9461da177e4SLinus Torvalds goto exit; 9471da177e4SLinus Torvalds lwbf = len - orbf; /* number of bytes to copy */ 9481da177e4SLinus Torvalds if (lwbf > c->wbuf_len) 9491da177e4SLinus Torvalds lwbf = c->wbuf_len; 9501da177e4SLinus Torvalds } 9511da177e4SLinus Torvalds if (lwbf > 0) 9521da177e4SLinus Torvalds memcpy(buf+orbf,c->wbuf+owbf,lwbf); 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds exit: 9551da177e4SLinus Torvalds up_read(&c->wbuf_sem); 9561da177e4SLinus Torvalds return ret; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 9598593fbc6SThomas Gleixner #define NR_OOB_SCAN_PAGES 4 9608593fbc6SThomas Gleixner 9611da177e4SLinus Torvalds /* 9621da177e4SLinus Torvalds * Check, if the out of band area is empty 9631da177e4SLinus Torvalds */ 9648593fbc6SThomas Gleixner int jffs2_check_oob_empty(struct jffs2_sb_info *c, 9658593fbc6SThomas Gleixner struct jffs2_eraseblock *jeb, int mode) 9661da177e4SLinus Torvalds { 9678593fbc6SThomas Gleixner int i, page, ret; 9688593fbc6SThomas Gleixner int oobsize = c->mtd->oobsize; 9698593fbc6SThomas Gleixner struct mtd_oob_ops ops; 9701da177e4SLinus Torvalds 9718593fbc6SThomas Gleixner ops.len = NR_OOB_SCAN_PAGES * oobsize; 9728593fbc6SThomas Gleixner ops.ooblen = oobsize; 9738593fbc6SThomas Gleixner ops.oobbuf = c->oobbuf; 9748593fbc6SThomas Gleixner ops.ooboffs = 0; 9758593fbc6SThomas Gleixner ops.datbuf = NULL; 9768593fbc6SThomas Gleixner ops.mode = MTD_OOB_PLACE; 9778593fbc6SThomas Gleixner 9788593fbc6SThomas Gleixner ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops); 9791da177e4SLinus Torvalds if (ret) { 9808593fbc6SThomas Gleixner D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB " 9818593fbc6SThomas Gleixner "failed %d for block at %08x\n", ret, jeb->offset)); 9828593fbc6SThomas Gleixner return ret; 9831da177e4SLinus Torvalds } 9841da177e4SLinus Torvalds 9858593fbc6SThomas Gleixner if (ops.retlen < ops.len) { 9868593fbc6SThomas Gleixner D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB " 9878593fbc6SThomas Gleixner "returned short read (%zd bytes not %d) for block " 9888593fbc6SThomas Gleixner "at %08x\n", ops.retlen, ops.len, jeb->offset)); 9898593fbc6SThomas Gleixner return -EIO; 9901da177e4SLinus Torvalds } 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds /* Special check for first page */ 9938593fbc6SThomas Gleixner for(i = 0; i < oobsize ; i++) { 9941da177e4SLinus Torvalds /* Yeah, we know about the cleanmarker. */ 9951da177e4SLinus Torvalds if (mode && i >= c->fsdata_pos && 9961da177e4SLinus Torvalds i < c->fsdata_pos + c->fsdata_len) 9971da177e4SLinus Torvalds continue; 9981da177e4SLinus Torvalds 9998593fbc6SThomas Gleixner if (ops.oobbuf[i] != 0xFF) { 10008593fbc6SThomas Gleixner D2(printk(KERN_DEBUG "Found %02x at %x in OOB for " 10018593fbc6SThomas Gleixner "%08x\n", ops.oobbuf[i], i, jeb->offset)); 10028593fbc6SThomas Gleixner return 1; 10031da177e4SLinus Torvalds } 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds /* we know, we are aligned :) */ 10078593fbc6SThomas Gleixner for (page = oobsize; page < ops.len; page += sizeof(long)) { 10088593fbc6SThomas Gleixner long dat = *(long *)(&ops.oobbuf[page]); 10098593fbc6SThomas Gleixner if(dat != -1) 10108593fbc6SThomas Gleixner return 1; 10111da177e4SLinus Torvalds } 10128593fbc6SThomas Gleixner return 0; 10131da177e4SLinus Torvalds } 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds /* 10161da177e4SLinus Torvalds * Scan for a valid cleanmarker and for bad blocks 10171da177e4SLinus Torvalds */ 10188593fbc6SThomas Gleixner int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, 10198593fbc6SThomas Gleixner struct jffs2_eraseblock *jeb) 10201da177e4SLinus Torvalds { 10211da177e4SLinus Torvalds struct jffs2_unknown_node n; 10228593fbc6SThomas Gleixner struct mtd_oob_ops ops; 10238593fbc6SThomas Gleixner int oobsize = c->mtd->oobsize; 10248593fbc6SThomas Gleixner unsigned char *p,*b; 10258593fbc6SThomas Gleixner int i, ret; 10268593fbc6SThomas Gleixner size_t offset = jeb->offset; 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds /* Check first if the block is bad. */ 10291da177e4SLinus Torvalds if (c->mtd->block_isbad(c->mtd, offset)) { 10308593fbc6SThomas Gleixner D1 (printk(KERN_WARNING "jffs2_check_nand_cleanmarker()" 10318593fbc6SThomas Gleixner ": Bad block at %08x\n", jeb->offset)); 10321da177e4SLinus Torvalds return 2; 10331da177e4SLinus Torvalds } 10341da177e4SLinus Torvalds 10358593fbc6SThomas Gleixner ops.len = oobsize; 10368593fbc6SThomas Gleixner ops.ooblen = oobsize; 10378593fbc6SThomas Gleixner ops.oobbuf = c->oobbuf; 10388593fbc6SThomas Gleixner ops.ooboffs = 0; 10398593fbc6SThomas Gleixner ops.datbuf = NULL; 10408593fbc6SThomas Gleixner ops.mode = MTD_OOB_PLACE; 10418593fbc6SThomas Gleixner 10428593fbc6SThomas Gleixner ret = c->mtd->read_oob(c->mtd, offset, &ops); 10431da177e4SLinus Torvalds if (ret) { 10448593fbc6SThomas Gleixner D1 (printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): " 10458593fbc6SThomas Gleixner "Read OOB failed %d for block at %08x\n", 10468593fbc6SThomas Gleixner ret, jeb->offset)); 10471da177e4SLinus Torvalds return ret; 10481da177e4SLinus Torvalds } 10498593fbc6SThomas Gleixner 10508593fbc6SThomas Gleixner if (ops.retlen < ops.len) { 10518593fbc6SThomas Gleixner D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): " 10528593fbc6SThomas Gleixner "Read OOB return short read (%zd bytes not %d) " 10538593fbc6SThomas Gleixner "for block at %08x\n", ops.retlen, ops.len, 10548593fbc6SThomas Gleixner jeb->offset)); 10551da177e4SLinus Torvalds return -EIO; 10561da177e4SLinus Torvalds } 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK); 10591da177e4SLinus Torvalds n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER); 10601da177e4SLinus Torvalds n.totlen = cpu_to_je32 (8); 10611da177e4SLinus Torvalds p = (unsigned char *) &n; 10628593fbc6SThomas Gleixner b = c->oobbuf + c->fsdata_pos; 10631da177e4SLinus Torvalds 10648593fbc6SThomas Gleixner for (i = c->fsdata_len; i; i--) { 10658593fbc6SThomas Gleixner if (*b++ != *p++) 10668593fbc6SThomas Gleixner ret = 1; 10671da177e4SLinus Torvalds } 10688593fbc6SThomas Gleixner 10698593fbc6SThomas Gleixner D1(if (ret == 1) { 10708593fbc6SThomas Gleixner printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): " 10718593fbc6SThomas Gleixner "Cleanmarker node not detected in block at %08x\n", 10728593fbc6SThomas Gleixner offset); 10739bfeb691SDavid Woodhouse printk(KERN_WARNING "OOB at %08zx was ", offset); 10748593fbc6SThomas Gleixner for (i=0; i < oobsize; i++) 10758593fbc6SThomas Gleixner printk("%02x ", c->oobbuf[i]); 10761da177e4SLinus Torvalds printk("\n"); 10778593fbc6SThomas Gleixner }); 10788593fbc6SThomas Gleixner return ret; 10791da177e4SLinus Torvalds } 10801da177e4SLinus Torvalds 10818593fbc6SThomas Gleixner int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, 10828593fbc6SThomas Gleixner struct jffs2_eraseblock *jeb) 10831da177e4SLinus Torvalds { 10841da177e4SLinus Torvalds struct jffs2_unknown_node n; 10851da177e4SLinus Torvalds int ret; 10868593fbc6SThomas Gleixner struct mtd_oob_ops ops; 10871da177e4SLinus Torvalds 10881da177e4SLinus Torvalds n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 10891da177e4SLinus Torvalds n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER); 10901da177e4SLinus Torvalds n.totlen = cpu_to_je32(8); 10911da177e4SLinus Torvalds 10928593fbc6SThomas Gleixner ops.len = c->fsdata_len; 10938593fbc6SThomas Gleixner ops.ooblen = c->fsdata_len;; 10948593fbc6SThomas Gleixner ops.oobbuf = (uint8_t *)&n; 10958593fbc6SThomas Gleixner ops.ooboffs = c->fsdata_pos; 10968593fbc6SThomas Gleixner ops.datbuf = NULL; 10978593fbc6SThomas Gleixner ops.mode = MTD_OOB_PLACE; 10988593fbc6SThomas Gleixner 10998593fbc6SThomas Gleixner ret = c->mtd->write_oob(c->mtd, jeb->offset, &ops); 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds if (ret) { 11028593fbc6SThomas Gleixner D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): " 11038593fbc6SThomas Gleixner "Write failed for block at %08x: error %d\n", 11048593fbc6SThomas Gleixner jeb->offset, ret)); 11051da177e4SLinus Torvalds return ret; 11061da177e4SLinus Torvalds } 11078593fbc6SThomas Gleixner if (ops.retlen != ops.len) { 11088593fbc6SThomas Gleixner D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): " 11098593fbc6SThomas Gleixner "Short write for block at %08x: %zd not %d\n", 11108593fbc6SThomas Gleixner jeb->offset, ops.retlen, ops.len)); 11118593fbc6SThomas Gleixner return -EIO; 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds return 0; 11141da177e4SLinus Torvalds } 11151da177e4SLinus Torvalds 11161da177e4SLinus Torvalds /* 11171da177e4SLinus Torvalds * On NAND we try to mark this block bad. If the block was erased more 11181da177e4SLinus Torvalds * than MAX_ERASE_FAILURES we mark it finaly bad. 11191da177e4SLinus Torvalds * Don't care about failures. This block remains on the erase-pending 11201da177e4SLinus Torvalds * or badblock list as long as nobody manipulates the flash with 11211da177e4SLinus Torvalds * a bootloader or something like that. 11221da177e4SLinus Torvalds */ 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset) 11251da177e4SLinus Torvalds { 11261da177e4SLinus Torvalds int ret; 11271da177e4SLinus Torvalds 11281da177e4SLinus Torvalds /* if the count is < max, we try to write the counter to the 2nd page oob area */ 11291da177e4SLinus Torvalds if( ++jeb->bad_count < MAX_ERASE_FAILURES) 11301da177e4SLinus Torvalds return 0; 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds if (!c->mtd->block_markbad) 11331da177e4SLinus Torvalds return 1; // What else can we do? 11341da177e4SLinus Torvalds 11351da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset)); 11361da177e4SLinus Torvalds ret = c->mtd->block_markbad(c->mtd, bad_offset); 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds if (ret) { 11391da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); 11401da177e4SLinus Torvalds return ret; 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds return 1; 11431da177e4SLinus Torvalds } 11441da177e4SLinus Torvalds 11451da177e4SLinus Torvalds static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c) 11461da177e4SLinus Torvalds { 11475bd34c09SThomas Gleixner struct nand_ecclayout *oinfo = c->mtd->ecclayout; 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds /* Do this only, if we have an oob buffer */ 11501da177e4SLinus Torvalds if (!c->mtd->oobsize) 11511da177e4SLinus Torvalds return 0; 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds /* Cleanmarker is out-of-band, so inline size zero */ 11541da177e4SLinus Torvalds c->cleanmarker_size = 0; 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds /* Should we use autoplacement ? */ 11575bd34c09SThomas Gleixner if (!oinfo) { 11581da177e4SLinus Torvalds D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n")); 11591da177e4SLinus Torvalds return -EINVAL; 11601da177e4SLinus Torvalds } 11615bd34c09SThomas Gleixner 11625bd34c09SThomas Gleixner D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n")); 11635bd34c09SThomas Gleixner /* Get the position of the free bytes */ 11645bd34c09SThomas Gleixner if (!oinfo->oobfree[0].length) { 11655bd34c09SThomas Gleixner printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep." 11665bd34c09SThomas Gleixner " Autoplacement selected and no empty space in oob\n"); 11675bd34c09SThomas Gleixner return -ENOSPC; 11681da177e4SLinus Torvalds } 11695bd34c09SThomas Gleixner c->fsdata_pos = oinfo->oobfree[0].offset; 11705bd34c09SThomas Gleixner c->fsdata_len = oinfo->oobfree[0].length; 11715bd34c09SThomas Gleixner if (c->fsdata_len > 8) 11725bd34c09SThomas Gleixner c->fsdata_len = 8; 11735bd34c09SThomas Gleixner 11741da177e4SLinus Torvalds return 0; 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds int jffs2_nand_flash_setup(struct jffs2_sb_info *c) 11781da177e4SLinus Torvalds { 11791da177e4SLinus Torvalds int res; 11801da177e4SLinus Torvalds 11811da177e4SLinus Torvalds /* Initialise write buffer */ 11821da177e4SLinus Torvalds init_rwsem(&c->wbuf_sem); 118328318776SJoern Engel c->wbuf_pagesize = c->mtd->writesize; 11841da177e4SLinus Torvalds c->wbuf_ofs = 0xFFFFFFFF; 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 11871da177e4SLinus Torvalds if (!c->wbuf) 11881da177e4SLinus Torvalds return -ENOMEM; 11891da177e4SLinus Torvalds 11908593fbc6SThomas Gleixner c->oobbuf = kmalloc(NR_OOB_SCAN_PAGES * c->mtd->oobsize, GFP_KERNEL); 11918593fbc6SThomas Gleixner if (!c->oobbuf) 11928593fbc6SThomas Gleixner return -ENOMEM; 11938593fbc6SThomas Gleixner 11941da177e4SLinus Torvalds res = jffs2_nand_set_oobinfo(c); 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds #ifdef BREAKME 11971da177e4SLinus Torvalds if (!brokenbuf) 11981da177e4SLinus Torvalds brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 11991da177e4SLinus Torvalds if (!brokenbuf) { 12001da177e4SLinus Torvalds kfree(c->wbuf); 12011da177e4SLinus Torvalds return -ENOMEM; 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds memset(brokenbuf, 0xdb, c->wbuf_pagesize); 12041da177e4SLinus Torvalds #endif 12051da177e4SLinus Torvalds return res; 12061da177e4SLinus Torvalds } 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c) 12091da177e4SLinus Torvalds { 12101da177e4SLinus Torvalds kfree(c->wbuf); 12118593fbc6SThomas Gleixner kfree(c->oobbuf); 12121da177e4SLinus Torvalds } 12131da177e4SLinus Torvalds 12148f15fd55SAndrew Victor int jffs2_dataflash_setup(struct jffs2_sb_info *c) { 12158f15fd55SAndrew Victor c->cleanmarker_size = 0; /* No cleanmarkers needed */ 12168f15fd55SAndrew Victor 12178f15fd55SAndrew Victor /* Initialize write buffer */ 12188f15fd55SAndrew Victor init_rwsem(&c->wbuf_sem); 12198f15fd55SAndrew Victor 1220daba5cc4SArtem B. Bityutskiy 1221daba5cc4SArtem B. Bityutskiy c->wbuf_pagesize = c->mtd->erasesize; 1222daba5cc4SArtem B. Bityutskiy 1223daba5cc4SArtem B. Bityutskiy /* Find a suitable c->sector_size 1224daba5cc4SArtem B. Bityutskiy * - Not too much sectors 1225daba5cc4SArtem B. Bityutskiy * - Sectors have to be at least 4 K + some bytes 1226daba5cc4SArtem B. Bityutskiy * - All known dataflashes have erase sizes of 528 or 1056 1227daba5cc4SArtem B. Bityutskiy * - we take at least 8 eraseblocks and want to have at least 8K size 1228daba5cc4SArtem B. Bityutskiy * - The concatenation should be a power of 2 1229daba5cc4SArtem B. Bityutskiy */ 1230daba5cc4SArtem B. Bityutskiy 1231daba5cc4SArtem B. Bityutskiy c->sector_size = 8 * c->mtd->erasesize; 1232daba5cc4SArtem B. Bityutskiy 1233daba5cc4SArtem B. Bityutskiy while (c->sector_size < 8192) { 1234daba5cc4SArtem B. Bityutskiy c->sector_size *= 2; 1235daba5cc4SArtem B. Bityutskiy } 1236daba5cc4SArtem B. Bityutskiy 1237daba5cc4SArtem B. Bityutskiy /* It may be necessary to adjust the flash size */ 1238daba5cc4SArtem B. Bityutskiy c->flash_size = c->mtd->size; 1239daba5cc4SArtem B. Bityutskiy 1240daba5cc4SArtem B. Bityutskiy if ((c->flash_size % c->sector_size) != 0) { 1241daba5cc4SArtem B. Bityutskiy c->flash_size = (c->flash_size / c->sector_size) * c->sector_size; 1242daba5cc4SArtem B. Bityutskiy printk(KERN_WARNING "JFFS2 flash size adjusted to %dKiB\n", c->flash_size); 1243daba5cc4SArtem B. Bityutskiy }; 1244daba5cc4SArtem B. Bityutskiy 1245daba5cc4SArtem B. Bityutskiy c->wbuf_ofs = 0xFFFFFFFF; 12468f15fd55SAndrew Victor c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 12478f15fd55SAndrew Victor if (!c->wbuf) 12488f15fd55SAndrew Victor return -ENOMEM; 12498f15fd55SAndrew Victor 1250daba5cc4SArtem B. Bityutskiy printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size); 12518f15fd55SAndrew Victor 12528f15fd55SAndrew Victor return 0; 12538f15fd55SAndrew Victor } 12548f15fd55SAndrew Victor 12558f15fd55SAndrew Victor void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) { 12568f15fd55SAndrew Victor kfree(c->wbuf); 12578f15fd55SAndrew Victor } 12588f15fd55SAndrew Victor 125959da721aSNicolas Pitre int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) { 1260c8b229deSJoern Engel /* Cleanmarker currently occupies whole programming regions, 1261c8b229deSJoern Engel * either one or 2 for 8Byte STMicro flashes. */ 1262c8b229deSJoern Engel c->cleanmarker_size = max(16u, c->mtd->writesize); 126359da721aSNicolas Pitre 126459da721aSNicolas Pitre /* Initialize write buffer */ 126559da721aSNicolas Pitre init_rwsem(&c->wbuf_sem); 126628318776SJoern Engel c->wbuf_pagesize = c->mtd->writesize; 126759da721aSNicolas Pitre c->wbuf_ofs = 0xFFFFFFFF; 126859da721aSNicolas Pitre 126959da721aSNicolas Pitre c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 127059da721aSNicolas Pitre if (!c->wbuf) 127159da721aSNicolas Pitre return -ENOMEM; 127259da721aSNicolas Pitre 127359da721aSNicolas Pitre return 0; 127459da721aSNicolas Pitre } 127559da721aSNicolas Pitre 127659da721aSNicolas Pitre void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) { 127759da721aSNicolas Pitre kfree(c->wbuf); 127859da721aSNicolas Pitre } 1279