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: 1939bfeb691SDavid Woodhouse frag = jffs2_lookup_node_frag(&f->fragtree, je32_to_cpu(node->i.offset)); 1949bfeb691SDavid Woodhouse BUG_ON(!frag); 1959bfeb691SDavid Woodhouse /* Find a frag which refers to the full_dnode we want to modify */ 1969bfeb691SDavid Woodhouse while (!frag->node || frag->node->raw != raw) { 1979bfeb691SDavid Woodhouse frag = frag_next(frag); 1989bfeb691SDavid Woodhouse BUG_ON(!frag); 1999bfeb691SDavid Woodhouse } 2009bfeb691SDavid Woodhouse dbg_noderef("Will replace ->raw in full_dnode at %p\n", frag->node); 2019bfeb691SDavid Woodhouse return &frag->node->raw; 2029bfeb691SDavid Woodhouse break; 2039bfeb691SDavid Woodhouse 2049bfeb691SDavid Woodhouse case JFFS2_NODETYPE_DIRENT: 2059bfeb691SDavid Woodhouse for (fd = f->dents; fd; fd = fd->next) { 2069bfeb691SDavid Woodhouse if (fd->raw == raw) { 2079bfeb691SDavid Woodhouse dbg_noderef("Will replace ->raw in full_dirent at %p\n", fd); 2089bfeb691SDavid Woodhouse return &fd->raw; 2099bfeb691SDavid Woodhouse } 2109bfeb691SDavid Woodhouse } 2119bfeb691SDavid Woodhouse BUG(); 2129bfeb691SDavid Woodhouse default: 2139bfeb691SDavid Woodhouse dbg_noderef("Don't care about replacing raw for nodetype %x\n", 2149bfeb691SDavid Woodhouse je16_to_cpu(node->u.nodetype)); 2159bfeb691SDavid Woodhouse break; 2169bfeb691SDavid Woodhouse } 2179bfeb691SDavid Woodhouse return NULL; 2189bfeb691SDavid Woodhouse } 2199bfeb691SDavid Woodhouse 2201da177e4SLinus Torvalds /* Recover from failure to write wbuf. Recover the nodes up to the 2211da177e4SLinus Torvalds * wbuf, not the one which we were starting to try to write. */ 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds static void jffs2_wbuf_recover(struct jffs2_sb_info *c) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds struct jffs2_eraseblock *jeb, *new_jeb; 2269bfeb691SDavid Woodhouse struct jffs2_raw_node_ref *raw, *next, *first_raw = NULL; 2271da177e4SLinus Torvalds size_t retlen; 2281da177e4SLinus Torvalds int ret; 2299bfeb691SDavid Woodhouse int nr_refile = 0; 2301da177e4SLinus Torvalds unsigned char *buf; 2311da177e4SLinus Torvalds uint32_t start, end, ofs, len; 2321da177e4SLinus Torvalds 233046b8b98SDavid Woodhouse jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; 234046b8b98SDavid Woodhouse 2351da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 2367f716cf3SEstelle Hammache jffs2_block_refile(c, jeb, REFILE_NOTEMPTY); 2379bfeb691SDavid Woodhouse spin_unlock(&c->erase_completion_lock); 2389bfeb691SDavid Woodhouse 2399bfeb691SDavid Woodhouse BUG_ON(!ref_obsolete(jeb->last_node)); 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds /* Find the first node to be recovered, by skipping over every 2421da177e4SLinus Torvalds node which ends before the wbuf starts, or which is obsolete. */ 2439bfeb691SDavid Woodhouse for (next = raw = jeb->first_node; next; raw = next) { 2449bfeb691SDavid Woodhouse next = ref_next(raw); 2459bfeb691SDavid Woodhouse 2469bfeb691SDavid Woodhouse if (ref_obsolete(raw) || 2479bfeb691SDavid Woodhouse (next && ref_offset(next) <= c->wbuf_ofs)) { 2489bfeb691SDavid Woodhouse dbg_noderef("Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n", 2499bfeb691SDavid Woodhouse ref_offset(raw), ref_flags(raw), 2509bfeb691SDavid Woodhouse (ref_offset(raw) + ref_totlen(c, jeb, raw)), 2519bfeb691SDavid Woodhouse c->wbuf_ofs); 2529bfeb691SDavid Woodhouse continue; 2539bfeb691SDavid Woodhouse } 2549bfeb691SDavid Woodhouse dbg_noderef("First node to be recovered is at 0x%08x(%d)-0x%08x\n", 2559bfeb691SDavid Woodhouse ref_offset(raw), ref_flags(raw), 2569bfeb691SDavid Woodhouse (ref_offset(raw) + ref_totlen(c, jeb, raw))); 2579bfeb691SDavid Woodhouse 2589bfeb691SDavid Woodhouse first_raw = raw; 2599bfeb691SDavid Woodhouse break; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2629bfeb691SDavid Woodhouse if (!first_raw) { 2631da177e4SLinus Torvalds /* All nodes were obsolete. Nothing to recover. */ 2641da177e4SLinus Torvalds D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n")); 2659bfeb691SDavid Woodhouse c->wbuf_len = 0; 2661da177e4SLinus Torvalds return; 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2699bfeb691SDavid Woodhouse start = ref_offset(first_raw); 2709bfeb691SDavid Woodhouse end = ref_offset(jeb->last_node); 2719bfeb691SDavid Woodhouse nr_refile = 1; 2721da177e4SLinus Torvalds 2739bfeb691SDavid Woodhouse /* Count the number of refs which need to be copied */ 2749bfeb691SDavid Woodhouse while ((raw = ref_next(raw)) != jeb->last_node) 2759bfeb691SDavid Woodhouse nr_refile++; 2761da177e4SLinus Torvalds 2779bfeb691SDavid Woodhouse dbg_noderef("wbuf recover %08x-%08x (%d bytes in %d nodes)\n", 2789bfeb691SDavid Woodhouse start, end, end - start, nr_refile); 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds buf = NULL; 2811da177e4SLinus Torvalds if (start < c->wbuf_ofs) { 2821da177e4SLinus Torvalds /* First affected node was already partially written. 2831da177e4SLinus Torvalds * Attempt to reread the old data into our buffer. */ 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds buf = kmalloc(end - start, GFP_KERNEL); 2861da177e4SLinus Torvalds if (!buf) { 2871da177e4SLinus Torvalds printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n"); 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds goto read_failed; 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds /* Do the read... */ 2931da177e4SLinus Torvalds ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf); 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) { 2961da177e4SLinus Torvalds /* ECC recovered */ 2971da177e4SLinus Torvalds ret = 0; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds if (ret || retlen != c->wbuf_ofs - start) { 3001da177e4SLinus Torvalds printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n"); 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds kfree(buf); 3031da177e4SLinus Torvalds buf = NULL; 3041da177e4SLinus Torvalds read_failed: 3059bfeb691SDavid Woodhouse first_raw = ref_next(first_raw); 3069bfeb691SDavid Woodhouse nr_refile--; 3079bfeb691SDavid Woodhouse while (first_raw && ref_obsolete(first_raw)) { 3089bfeb691SDavid Woodhouse first_raw = ref_next(first_raw); 3099bfeb691SDavid Woodhouse nr_refile--; 3109bfeb691SDavid Woodhouse } 3119bfeb691SDavid Woodhouse 3121da177e4SLinus Torvalds /* If this was the only node to be recovered, give up */ 3139bfeb691SDavid Woodhouse if (!first_raw) { 3149bfeb691SDavid Woodhouse c->wbuf_len = 0; 3151da177e4SLinus Torvalds return; 3169bfeb691SDavid Woodhouse } 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds /* It wasn't. Go on and try to recover nodes complete in the wbuf */ 3199bfeb691SDavid Woodhouse start = ref_offset(first_raw); 3209bfeb691SDavid Woodhouse dbg_noderef("wbuf now recover %08x-%08x (%d bytes in %d nodes)\n", 3219bfeb691SDavid Woodhouse start, end, end - start, nr_refile); 3229bfeb691SDavid Woodhouse 3231da177e4SLinus Torvalds } else { 3241da177e4SLinus Torvalds /* Read succeeded. Copy the remaining data from the wbuf */ 3251da177e4SLinus Torvalds memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs); 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards. 3291da177e4SLinus Torvalds Either 'buf' contains the data, or we find it in the wbuf */ 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* ... and get an allocation of space from a shiny new block instead */ 3329fe4854cSDavid Woodhouse ret = jffs2_reserve_space_gc(c, end-start, &len, JFFS2_SUMMARY_NOSUM_SIZE); 3331da177e4SLinus Torvalds if (ret) { 3341da177e4SLinus Torvalds printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n"); 3351da177e4SLinus Torvalds kfree(buf); 3361da177e4SLinus Torvalds return; 3371da177e4SLinus Torvalds } 3389bfeb691SDavid Woodhouse 3399bfeb691SDavid Woodhouse ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, nr_refile); 3409bfeb691SDavid Woodhouse if (ret) { 3419bfeb691SDavid Woodhouse printk(KERN_WARNING "Failed to allocate node refs for wbuf recovery. Data loss ensues.\n"); 3429bfeb691SDavid Woodhouse kfree(buf); 3439bfeb691SDavid Woodhouse return; 3449bfeb691SDavid Woodhouse } 3459bfeb691SDavid Woodhouse 3469fe4854cSDavid Woodhouse ofs = write_ofs(c); 3479fe4854cSDavid Woodhouse 3481da177e4SLinus Torvalds if (end-start >= c->wbuf_pagesize) { 3497f716cf3SEstelle Hammache /* Need to do another write immediately, but it's possible 3507f716cf3SEstelle Hammache that this is just because the wbuf itself is completely 3517f716cf3SEstelle Hammache full, and there's nothing earlier read back from the 3527f716cf3SEstelle Hammache flash. Hence 'buf' isn't necessarily what we're writing 3537f716cf3SEstelle Hammache from. */ 3547f716cf3SEstelle Hammache unsigned char *rewrite_buf = buf?:c->wbuf; 3551da177e4SLinus Torvalds uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n", 3581da177e4SLinus Torvalds towrite, ofs)); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds #ifdef BREAKMEHEADER 3611da177e4SLinus Torvalds static int breakme; 3621da177e4SLinus Torvalds if (breakme++ == 20) { 3631da177e4SLinus Torvalds printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs); 3641da177e4SLinus Torvalds breakme = 0; 3659223a456SThomas Gleixner c->mtd->write(c->mtd, ofs, towrite, &retlen, 3669223a456SThomas Gleixner brokenbuf); 3671da177e4SLinus Torvalds ret = -EIO; 3681da177e4SLinus Torvalds } else 3691da177e4SLinus Torvalds #endif 3709223a456SThomas Gleixner ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, 3719223a456SThomas Gleixner rewrite_buf); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds if (ret || retlen != towrite) { 3741da177e4SLinus Torvalds /* Argh. We tried. Really we did. */ 3751da177e4SLinus Torvalds printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n"); 3761da177e4SLinus Torvalds kfree(buf); 3771da177e4SLinus Torvalds 3782f785402SDavid Woodhouse if (retlen) 3799bfeb691SDavid Woodhouse jffs2_add_physical_node_ref(c, ofs | REF_OBSOLETE, ref_totlen(c, jeb, first_raw), NULL); 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds return; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs); 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds c->wbuf_len = (end - start) - towrite; 3861da177e4SLinus Torvalds c->wbuf_ofs = ofs + towrite; 3877f716cf3SEstelle Hammache memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len); 3881da177e4SLinus Torvalds /* Don't muck about with c->wbuf_inodes. False positives are harmless. */ 3891da177e4SLinus Torvalds } else { 3901da177e4SLinus Torvalds /* OK, now we're left with the dregs in whichever buffer we're using */ 3911da177e4SLinus Torvalds if (buf) { 3921da177e4SLinus Torvalds memcpy(c->wbuf, buf, end-start); 3931da177e4SLinus Torvalds } else { 3941da177e4SLinus Torvalds memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start); 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds c->wbuf_ofs = ofs; 3971da177e4SLinus Torvalds c->wbuf_len = end - start; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */ 4011da177e4SLinus Torvalds new_jeb = &c->blocks[ofs / c->sector_size]; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 4049bfeb691SDavid Woodhouse for (raw = first_raw; raw != jeb->last_node; raw = ref_next(raw)) { 4059bfeb691SDavid Woodhouse uint32_t rawlen = ref_totlen(c, jeb, raw); 4069bfeb691SDavid Woodhouse struct jffs2_inode_cache *ic; 4079bfeb691SDavid Woodhouse struct jffs2_raw_node_ref *new_ref; 4089bfeb691SDavid Woodhouse struct jffs2_raw_node_ref **adjust_ref = NULL; 4099bfeb691SDavid Woodhouse struct jffs2_inode_info *f = NULL; 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n", 4129bfeb691SDavid Woodhouse rawlen, ref_offset(raw), ref_flags(raw), ofs)); 4131da177e4SLinus Torvalds 4149bfeb691SDavid Woodhouse ic = jffs2_raw_ref_to_ic(raw); 4159bfeb691SDavid Woodhouse 4169bfeb691SDavid Woodhouse /* Ick. This XATTR mess should be fixed shortly... */ 4179bfeb691SDavid Woodhouse if (ic && ic->class == RAWNODE_CLASS_XATTR_DATUM) { 4189bfeb691SDavid Woodhouse struct jffs2_xattr_datum *xd = (void *)ic; 4199bfeb691SDavid Woodhouse BUG_ON(xd->node != raw); 4209bfeb691SDavid Woodhouse adjust_ref = &xd->node; 4219bfeb691SDavid Woodhouse raw->next_in_ino = NULL; 4229bfeb691SDavid Woodhouse ic = NULL; 4239bfeb691SDavid Woodhouse } else if (ic && ic->class == RAWNODE_CLASS_XATTR_REF) { 4249bfeb691SDavid Woodhouse struct jffs2_xattr_datum *xr = (void *)ic; 4259bfeb691SDavid Woodhouse BUG_ON(xr->node != raw); 4269bfeb691SDavid Woodhouse adjust_ref = &xr->node; 4279bfeb691SDavid Woodhouse raw->next_in_ino = NULL; 4289bfeb691SDavid Woodhouse ic = NULL; 4299bfeb691SDavid Woodhouse } else if (ic && ic->class == RAWNODE_CLASS_INODE_CACHE) { 4309bfeb691SDavid Woodhouse struct jffs2_raw_node_ref **p = &ic->nodes; 4319bfeb691SDavid Woodhouse 4329bfeb691SDavid Woodhouse /* Remove the old node from the per-inode list */ 4339bfeb691SDavid Woodhouse while (*p && *p != (void *)ic) { 4349bfeb691SDavid Woodhouse if (*p == raw) { 4359bfeb691SDavid Woodhouse (*p) = (raw->next_in_ino); 4369bfeb691SDavid Woodhouse raw->next_in_ino = NULL; 4379bfeb691SDavid Woodhouse break; 4389bfeb691SDavid Woodhouse } 4399bfeb691SDavid Woodhouse p = &((*p)->next_in_ino); 4409bfeb691SDavid Woodhouse } 4419bfeb691SDavid Woodhouse 4429bfeb691SDavid Woodhouse if (ic->state == INO_STATE_PRESENT && !ref_obsolete(raw)) { 4439bfeb691SDavid Woodhouse /* If it's an in-core inode, then we have to adjust any 4449bfeb691SDavid Woodhouse full_dirent or full_dnode structure to point to the 4459bfeb691SDavid Woodhouse new version instead of the old */ 4469bfeb691SDavid Woodhouse f = jffs2_gc_fetch_inode(c, ic->ino, ic->nlink); 4479bfeb691SDavid Woodhouse if (IS_ERR(f)) { 4489bfeb691SDavid Woodhouse /* Should never happen; it _must_ be present */ 4499bfeb691SDavid Woodhouse JFFS2_ERROR("Failed to iget() ino #%u, err %ld\n", 4509bfeb691SDavid Woodhouse ic->ino, PTR_ERR(f)); 4519bfeb691SDavid Woodhouse BUG(); 4529bfeb691SDavid Woodhouse } 4539bfeb691SDavid Woodhouse /* We don't lock f->sem. There's a number of ways we could 4549bfeb691SDavid Woodhouse end up in here with it already being locked, and nobody's 4559bfeb691SDavid Woodhouse going to modify it on us anyway because we hold the 4569bfeb691SDavid Woodhouse alloc_sem. We're only changing one ->raw pointer too, 4579bfeb691SDavid Woodhouse which we can get away with without upsetting readers. */ 4589bfeb691SDavid Woodhouse adjust_ref = jffs2_incore_replace_raw(c, f, raw, 4599bfeb691SDavid Woodhouse (void *)(buf?:c->wbuf) + (ref_offset(raw) - start)); 4609bfeb691SDavid Woodhouse } else if (unlikely(ic->state != INO_STATE_PRESENT && 4619bfeb691SDavid Woodhouse ic->state != INO_STATE_CHECKEDABSENT && 4629bfeb691SDavid Woodhouse ic->state != INO_STATE_GC)) { 4639bfeb691SDavid Woodhouse JFFS2_ERROR("Inode #%u is in strange state %d!\n", ic->ino, ic->state); 4649bfeb691SDavid Woodhouse BUG(); 4659bfeb691SDavid Woodhouse } 4669bfeb691SDavid Woodhouse } 4679bfeb691SDavid Woodhouse 4689bfeb691SDavid Woodhouse new_ref = jffs2_link_node_ref(c, new_jeb, ofs | ref_flags(raw), rawlen, ic); 4699bfeb691SDavid Woodhouse 4709bfeb691SDavid Woodhouse if (adjust_ref) { 4719bfeb691SDavid Woodhouse BUG_ON(*adjust_ref != raw); 4729bfeb691SDavid Woodhouse *adjust_ref = new_ref; 4739bfeb691SDavid Woodhouse } 4749bfeb691SDavid Woodhouse if (f) 4759bfeb691SDavid Woodhouse jffs2_gc_release_inode(c, f); 4769bfeb691SDavid Woodhouse 4779bfeb691SDavid Woodhouse if (!ref_obsolete(raw)) { 4781da177e4SLinus Torvalds jeb->dirty_size += rawlen; 4791da177e4SLinus Torvalds jeb->used_size -= rawlen; 4801da177e4SLinus Torvalds c->dirty_size += rawlen; 4819bfeb691SDavid Woodhouse c->used_size -= rawlen; 4829bfeb691SDavid Woodhouse raw->flash_offset = ref_offset(raw) | REF_OBSOLETE; 4839bfeb691SDavid Woodhouse BUG_ON(raw->next_in_ino); 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds ofs += rawlen; 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds 4889bfeb691SDavid Woodhouse kfree(buf); 4899bfeb691SDavid Woodhouse 4901da177e4SLinus Torvalds /* Fix up the original jeb now it's on the bad_list */ 4919bfeb691SDavid Woodhouse if (first_raw == jeb->first_node) { 4921da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset)); 4931da177e4SLinus Torvalds list_del(&jeb->list); 4941da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 4951da177e4SLinus Torvalds c->nr_erasing_blocks++; 4961da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 499e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_sanity_check_nolock(c, jeb); 500e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 5011da177e4SLinus Torvalds 502e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_sanity_check_nolock(c, new_jeb); 503e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, new_jeb); 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 5061da177e4SLinus Torvalds 5079bfeb691SDavid Woodhouse D1(printk(KERN_DEBUG "wbuf recovery completed OK. wbuf_ofs 0x%08x, len 0x%x\n", c->wbuf_ofs, c->wbuf_len)); 5089bfeb691SDavid Woodhouse 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* Meaning of pad argument: 5121da177e4SLinus Torvalds 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway. 5131da177e4SLinus Torvalds 1: Pad, do not adjust nextblock free_size 5141da177e4SLinus Torvalds 2: Pad, adjust nextblock free_size 5151da177e4SLinus Torvalds */ 5161da177e4SLinus Torvalds #define NOPAD 0 5171da177e4SLinus Torvalds #define PAD_NOACCOUNT 1 5181da177e4SLinus Torvalds #define PAD_ACCOUNTING 2 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad) 5211da177e4SLinus Torvalds { 5229bfeb691SDavid Woodhouse struct jffs2_eraseblock *wbuf_jeb; 5231da177e4SLinus Torvalds int ret; 5241da177e4SLinus Torvalds size_t retlen; 5251da177e4SLinus Torvalds 5263be36675SAndrew Victor /* Nothing to do if not write-buffering the flash. In particular, we shouldn't 5271da177e4SLinus Torvalds del_timer() the timer we never initialised. */ 5283be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 5291da177e4SLinus Torvalds return 0; 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds if (!down_trylock(&c->alloc_sem)) { 5321da177e4SLinus Torvalds up(&c->alloc_sem); 5331da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n"); 5341da177e4SLinus Torvalds BUG(); 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds 5373be36675SAndrew Victor if (!c->wbuf_len) /* already checked c->wbuf above */ 5381da177e4SLinus Torvalds return 0; 5391da177e4SLinus Torvalds 5409bfeb691SDavid Woodhouse wbuf_jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; 5419bfeb691SDavid Woodhouse if (jffs2_prealloc_raw_node_refs(c, wbuf_jeb, c->nextblock->allocated_refs + 1)) 5422f785402SDavid Woodhouse return -ENOMEM; 5432f785402SDavid Woodhouse 5441da177e4SLinus Torvalds /* claim remaining space on the page 5451da177e4SLinus Torvalds this happens, if we have a change to a new block, 5461da177e4SLinus Torvalds or if fsync forces us to flush the writebuffer. 5471da177e4SLinus Torvalds if we have a switch to next page, we will not have 5481da177e4SLinus Torvalds enough remaining space for this. 5491da177e4SLinus Torvalds */ 550daba5cc4SArtem B. Bityutskiy if (pad ) { 5511da177e4SLinus Torvalds c->wbuf_len = PAD(c->wbuf_len); 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR 5541da177e4SLinus Torvalds with 8 byte page size */ 5551da177e4SLinus Torvalds memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len); 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) { 5581da177e4SLinus Torvalds struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len); 5591da177e4SLinus Torvalds padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 5601da177e4SLinus Torvalds padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING); 5611da177e4SLinus Torvalds padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len); 5621da177e4SLinus Torvalds padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4)); 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds /* else jffs2_flash_writev has actually filled in the rest of the 5661da177e4SLinus Torvalds buffer for us, and will deal with the node refs etc. later. */ 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds #ifdef BREAKME 5691da177e4SLinus Torvalds static int breakme; 5701da177e4SLinus Torvalds if (breakme++ == 20) { 5711da177e4SLinus Torvalds printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs); 5721da177e4SLinus Torvalds breakme = 0; 5739223a456SThomas Gleixner c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, 5749223a456SThomas Gleixner brokenbuf); 5751da177e4SLinus Torvalds ret = -EIO; 5761da177e4SLinus Torvalds } else 5771da177e4SLinus Torvalds #endif 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf); 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds if (ret || retlen != c->wbuf_pagesize) { 5821da177e4SLinus Torvalds if (ret) 5831da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret); 5841da177e4SLinus Torvalds else { 5851da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n", 5861da177e4SLinus Torvalds retlen, c->wbuf_pagesize); 5871da177e4SLinus Torvalds ret = -EIO; 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds jffs2_wbuf_recover(c); 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds return ret; 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /* Adjust free size of the block if we padded. */ 596daba5cc4SArtem B. Bityutskiy if (pad) { 5970bcc099dSDavid Woodhouse uint32_t waste = c->wbuf_pagesize - c->wbuf_len; 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n", 6009bfeb691SDavid Woodhouse (wbuf_jeb==c->nextblock)?"next":"", wbuf_jeb->offset)); 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds /* wbuf_pagesize - wbuf_len is the amount of space that's to be 6031da177e4SLinus Torvalds padded. If there is less free space in the block than that, 6041da177e4SLinus Torvalds something screwed up */ 6059bfeb691SDavid Woodhouse if (wbuf_jeb->free_size < waste) { 6061da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n", 6070bcc099dSDavid Woodhouse c->wbuf_ofs, c->wbuf_len, waste); 6081da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n", 6099bfeb691SDavid Woodhouse wbuf_jeb->offset, wbuf_jeb->free_size); 6101da177e4SLinus Torvalds BUG(); 6111da177e4SLinus Torvalds } 6120bcc099dSDavid Woodhouse 6130bcc099dSDavid Woodhouse spin_lock(&c->erase_completion_lock); 6140bcc099dSDavid Woodhouse 6159bfeb691SDavid Woodhouse jffs2_link_node_ref(c, wbuf_jeb, (c->wbuf_ofs + c->wbuf_len) | REF_OBSOLETE, waste, NULL); 6160bcc099dSDavid Woodhouse /* FIXME: that made it count as dirty. Convert to wasted */ 6179bfeb691SDavid Woodhouse wbuf_jeb->dirty_size -= waste; 6180bcc099dSDavid Woodhouse c->dirty_size -= waste; 6199bfeb691SDavid Woodhouse wbuf_jeb->wasted_size += waste; 6200bcc099dSDavid Woodhouse c->wasted_size += waste; 6210bcc099dSDavid Woodhouse } else 6220bcc099dSDavid Woodhouse spin_lock(&c->erase_completion_lock); 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds /* Stick any now-obsoleted blocks on the erase_pending_list */ 6251da177e4SLinus Torvalds jffs2_refile_wbuf_blocks(c); 6261da177e4SLinus Torvalds jffs2_clear_wbuf_ino_list(c); 6271da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds memset(c->wbuf,0xff,c->wbuf_pagesize); 6301da177e4SLinus Torvalds /* adjust write buffer offset, else we get a non contiguous write bug */ 6311da177e4SLinus Torvalds c->wbuf_ofs += c->wbuf_pagesize; 6321da177e4SLinus Torvalds c->wbuf_len = 0; 6331da177e4SLinus Torvalds return 0; 6341da177e4SLinus Torvalds } 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds /* Trigger garbage collection to flush the write-buffer. 6371da177e4SLinus Torvalds If ino arg is zero, do it if _any_ real (i.e. not GC) writes are 6381da177e4SLinus Torvalds outstanding. If ino arg non-zero, do it only if a write for the 6391da177e4SLinus Torvalds given inode is outstanding. */ 6401da177e4SLinus Torvalds int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino) 6411da177e4SLinus Torvalds { 6421da177e4SLinus Torvalds uint32_t old_wbuf_ofs; 6431da177e4SLinus Torvalds uint32_t old_wbuf_len; 6441da177e4SLinus Torvalds int ret = 0; 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino)); 6471da177e4SLinus Torvalds 6488aee6ac1SDavid Woodhouse if (!c->wbuf) 6498aee6ac1SDavid Woodhouse return 0; 6508aee6ac1SDavid Woodhouse 6511da177e4SLinus Torvalds down(&c->alloc_sem); 6521da177e4SLinus Torvalds if (!jffs2_wbuf_pending_for_ino(c, ino)) { 6531da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino)); 6541da177e4SLinus Torvalds up(&c->alloc_sem); 6551da177e4SLinus Torvalds return 0; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds old_wbuf_ofs = c->wbuf_ofs; 6591da177e4SLinus Torvalds old_wbuf_len = c->wbuf_len; 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds if (c->unchecked_size) { 6621da177e4SLinus Torvalds /* GC won't make any progress for a while */ 6631da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n")); 6641da177e4SLinus Torvalds down_write(&c->wbuf_sem); 6651da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6667f716cf3SEstelle Hammache /* retry flushing wbuf in case jffs2_wbuf_recover 6677f716cf3SEstelle Hammache left some data in the wbuf */ 6687f716cf3SEstelle Hammache if (ret) 6697f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6701da177e4SLinus Torvalds up_write(&c->wbuf_sem); 6711da177e4SLinus Torvalds } else while (old_wbuf_len && 6721da177e4SLinus Torvalds old_wbuf_ofs == c->wbuf_ofs) { 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds up(&c->alloc_sem); 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n")); 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds ret = jffs2_garbage_collect_pass(c); 6791da177e4SLinus Torvalds if (ret) { 6801da177e4SLinus Torvalds /* GC failed. Flush it with padding instead */ 6811da177e4SLinus Torvalds down(&c->alloc_sem); 6821da177e4SLinus Torvalds down_write(&c->wbuf_sem); 6831da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6847f716cf3SEstelle Hammache /* retry flushing wbuf in case jffs2_wbuf_recover 6857f716cf3SEstelle Hammache left some data in the wbuf */ 6867f716cf3SEstelle Hammache if (ret) 6877f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 6881da177e4SLinus Torvalds up_write(&c->wbuf_sem); 6891da177e4SLinus Torvalds break; 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds down(&c->alloc_sem); 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n")); 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds up(&c->alloc_sem); 6971da177e4SLinus Torvalds return ret; 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* Pad write-buffer to end and write it, wasting space. */ 7011da177e4SLinus Torvalds int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c) 7021da177e4SLinus Torvalds { 7031da177e4SLinus Torvalds int ret; 7041da177e4SLinus Torvalds 7058aee6ac1SDavid Woodhouse if (!c->wbuf) 7068aee6ac1SDavid Woodhouse return 0; 7078aee6ac1SDavid Woodhouse 7081da177e4SLinus Torvalds down_write(&c->wbuf_sem); 7091da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 7107f716cf3SEstelle Hammache /* retry - maybe wbuf recover left some data in wbuf. */ 7117f716cf3SEstelle Hammache if (ret) 7127f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 7131da177e4SLinus Torvalds up_write(&c->wbuf_sem); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds return ret; 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds 718dcb09328SThomas Gleixner static size_t jffs2_fill_wbuf(struct jffs2_sb_info *c, const uint8_t *buf, 719dcb09328SThomas Gleixner size_t len) 720dcb09328SThomas Gleixner { 721dcb09328SThomas Gleixner if (len && !c->wbuf_len && (len >= c->wbuf_pagesize)) 722dcb09328SThomas Gleixner return 0; 723dcb09328SThomas Gleixner 724dcb09328SThomas Gleixner if (len > (c->wbuf_pagesize - c->wbuf_len)) 725dcb09328SThomas Gleixner len = c->wbuf_pagesize - c->wbuf_len; 726dcb09328SThomas Gleixner memcpy(c->wbuf + c->wbuf_len, buf, len); 727dcb09328SThomas Gleixner c->wbuf_len += (uint32_t) len; 728dcb09328SThomas Gleixner return len; 729dcb09328SThomas Gleixner } 730dcb09328SThomas Gleixner 731dcb09328SThomas Gleixner int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, 732dcb09328SThomas Gleixner unsigned long count, loff_t to, size_t *retlen, 733dcb09328SThomas Gleixner uint32_t ino) 734dcb09328SThomas Gleixner { 735dcb09328SThomas Gleixner struct jffs2_eraseblock *jeb; 736dcb09328SThomas Gleixner size_t wbuf_retlen, donelen = 0; 737dcb09328SThomas Gleixner uint32_t outvec_to = to; 738dcb09328SThomas Gleixner int ret, invec; 739dcb09328SThomas Gleixner 740dcb09328SThomas Gleixner /* If not writebuffered flash, don't bother */ 7413be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 7421da177e4SLinus Torvalds return jffs2_flash_direct_writev(c, invecs, count, to, retlen); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds down_write(&c->wbuf_sem); 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds /* If wbuf_ofs is not initialized, set it to target address */ 7471da177e4SLinus Torvalds if (c->wbuf_ofs == 0xFFFFFFFF) { 7481da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(to); 7491da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 7501da177e4SLinus Torvalds memset(c->wbuf,0xff,c->wbuf_pagesize); 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 753dcb09328SThomas Gleixner /* 754dcb09328SThomas Gleixner * Sanity checks on target address. It's permitted to write 755dcb09328SThomas Gleixner * at PAD(c->wbuf_len+c->wbuf_ofs), and it's permitted to 756dcb09328SThomas Gleixner * write at the beginning of a new erase block. Anything else, 757dcb09328SThomas Gleixner * and you die. New block starts at xxx000c (0-b = block 758dcb09328SThomas Gleixner * header) 7591da177e4SLinus Torvalds */ 7603be36675SAndrew Victor if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) { 7611da177e4SLinus Torvalds /* It's a write to a new block */ 7621da177e4SLinus Torvalds if (c->wbuf_len) { 763dcb09328SThomas Gleixner D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx " 764dcb09328SThomas Gleixner "causes flush of wbuf at 0x%08x\n", 765dcb09328SThomas Gleixner (unsigned long)to, c->wbuf_ofs)); 7661da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 767dcb09328SThomas Gleixner if (ret) 768dcb09328SThomas Gleixner goto outerr; 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds /* set pointer to new block */ 7711da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(to); 7721da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds if (to != PAD(c->wbuf_ofs + c->wbuf_len)) { 7761da177e4SLinus Torvalds /* We're not writing immediately after the writebuffer. Bad. */ 777dcb09328SThomas Gleixner printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write " 778dcb09328SThomas Gleixner "to %08lx\n", (unsigned long)to); 7791da177e4SLinus Torvalds if (c->wbuf_len) 7801da177e4SLinus Torvalds printk(KERN_CRIT "wbuf was previously %08x-%08x\n", 7811da177e4SLinus Torvalds c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len); 7821da177e4SLinus Torvalds BUG(); 7831da177e4SLinus Torvalds } 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds /* adjust alignment offset */ 7861da177e4SLinus Torvalds if (c->wbuf_len != PAGE_MOD(to)) { 7871da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 7881da177e4SLinus Torvalds /* take care of alignment to next page */ 789dcb09328SThomas Gleixner if (!c->wbuf_len) { 7901da177e4SLinus Torvalds c->wbuf_len = c->wbuf_pagesize; 7911da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, NOPAD); 792dcb09328SThomas Gleixner if (ret) 793dcb09328SThomas Gleixner goto outerr; 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds 797dcb09328SThomas Gleixner for (invec = 0; invec < count; invec++) { 798dcb09328SThomas Gleixner int vlen = invecs[invec].iov_len; 799dcb09328SThomas Gleixner uint8_t *v = invecs[invec].iov_base; 8001da177e4SLinus Torvalds 801dcb09328SThomas Gleixner wbuf_retlen = jffs2_fill_wbuf(c, v, vlen); 8021da177e4SLinus Torvalds 803dcb09328SThomas Gleixner if (c->wbuf_len == c->wbuf_pagesize) { 804dcb09328SThomas Gleixner ret = __jffs2_flush_wbuf(c, NOPAD); 805dcb09328SThomas Gleixner if (ret) 806dcb09328SThomas Gleixner goto outerr; 8071da177e4SLinus Torvalds } 808dcb09328SThomas Gleixner vlen -= wbuf_retlen; 809dcb09328SThomas Gleixner outvec_to += wbuf_retlen; 8101da177e4SLinus Torvalds donelen += wbuf_retlen; 811dcb09328SThomas Gleixner v += wbuf_retlen; 8121da177e4SLinus Torvalds 813dcb09328SThomas Gleixner if (vlen >= c->wbuf_pagesize) { 814dcb09328SThomas Gleixner ret = c->mtd->write(c->mtd, outvec_to, PAGE_DIV(vlen), 815dcb09328SThomas Gleixner &wbuf_retlen, v); 816dcb09328SThomas Gleixner if (ret < 0 || wbuf_retlen != PAGE_DIV(vlen)) 817dcb09328SThomas Gleixner goto outfile; 818dcb09328SThomas Gleixner 819dcb09328SThomas Gleixner vlen -= wbuf_retlen; 820dcb09328SThomas Gleixner outvec_to += wbuf_retlen; 821dcb09328SThomas Gleixner c->wbuf_ofs = outvec_to; 822dcb09328SThomas Gleixner donelen += wbuf_retlen; 823dcb09328SThomas Gleixner v += wbuf_retlen; 8241da177e4SLinus Torvalds } 8251da177e4SLinus Torvalds 826dcb09328SThomas Gleixner wbuf_retlen = jffs2_fill_wbuf(c, v, vlen); 827dcb09328SThomas Gleixner if (c->wbuf_len == c->wbuf_pagesize) { 828dcb09328SThomas Gleixner ret = __jffs2_flush_wbuf(c, NOPAD); 829dcb09328SThomas Gleixner if (ret) 830dcb09328SThomas Gleixner goto outerr; 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds 833dcb09328SThomas Gleixner outvec_to += wbuf_retlen; 834dcb09328SThomas Gleixner donelen += wbuf_retlen; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 837dcb09328SThomas Gleixner /* 838dcb09328SThomas Gleixner * If there's a remainder in the wbuf and it's a non-GC write, 839dcb09328SThomas Gleixner * remember that the wbuf affects this ino 840dcb09328SThomas Gleixner */ 8411da177e4SLinus Torvalds *retlen = donelen; 8421da177e4SLinus Torvalds 843e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 844e631ddbaSFerenc Havasi int res = jffs2_sum_add_kvec(c, invecs, count, (uint32_t) to); 845e631ddbaSFerenc Havasi if (res) 846e631ddbaSFerenc Havasi return res; 847e631ddbaSFerenc Havasi } 848e631ddbaSFerenc Havasi 8491da177e4SLinus Torvalds if (c->wbuf_len && ino) 8501da177e4SLinus Torvalds jffs2_wbuf_dirties_inode(c, ino); 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds ret = 0; 853dcb09328SThomas Gleixner up_write(&c->wbuf_sem); 854dcb09328SThomas Gleixner return ret; 8551da177e4SLinus Torvalds 856dcb09328SThomas Gleixner outfile: 857dcb09328SThomas Gleixner /* 858dcb09328SThomas Gleixner * At this point we have no problem, c->wbuf is empty. However 859dcb09328SThomas Gleixner * refile nextblock to avoid writing again to same address. 860dcb09328SThomas Gleixner */ 861dcb09328SThomas Gleixner 862dcb09328SThomas Gleixner spin_lock(&c->erase_completion_lock); 863dcb09328SThomas Gleixner 864dcb09328SThomas Gleixner jeb = &c->blocks[outvec_to / c->sector_size]; 865dcb09328SThomas Gleixner jffs2_block_refile(c, jeb, REFILE_ANYWAY); 866dcb09328SThomas Gleixner 867dcb09328SThomas Gleixner spin_unlock(&c->erase_completion_lock); 868dcb09328SThomas Gleixner 869dcb09328SThomas Gleixner outerr: 870dcb09328SThomas Gleixner *retlen = 0; 8711da177e4SLinus Torvalds up_write(&c->wbuf_sem); 8721da177e4SLinus Torvalds return ret; 8731da177e4SLinus Torvalds } 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds /* 8761da177e4SLinus Torvalds * This is the entry for flash write. 8771da177e4SLinus Torvalds * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev 8781da177e4SLinus Torvalds */ 8799bfeb691SDavid Woodhouse int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, 8809bfeb691SDavid Woodhouse size_t *retlen, const u_char *buf) 8811da177e4SLinus Torvalds { 8821da177e4SLinus Torvalds struct kvec vecs[1]; 8831da177e4SLinus Torvalds 8843be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 885e631ddbaSFerenc Havasi return jffs2_flash_direct_write(c, ofs, len, retlen, buf); 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds vecs[0].iov_base = (unsigned char *) buf; 8881da177e4SLinus Torvalds vecs[0].iov_len = len; 8891da177e4SLinus Torvalds return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0); 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds /* 8931da177e4SLinus Torvalds Handle readback from writebuffer and ECC failure return 8941da177e4SLinus Torvalds */ 8951da177e4SLinus Torvalds int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf) 8961da177e4SLinus Torvalds { 8971da177e4SLinus Torvalds loff_t orbf = 0, owbf = 0, lwbf = 0; 8981da177e4SLinus Torvalds int ret; 8991da177e4SLinus Torvalds 9003be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 9013be36675SAndrew Victor return c->mtd->read(c->mtd, ofs, len, retlen, buf); 9021da177e4SLinus Torvalds 9033be36675SAndrew Victor /* Read flash */ 904894214d1SArtem B. Bityuckiy down_read(&c->wbuf_sem); 9051da177e4SLinus Torvalds ret = c->mtd->read(c->mtd, ofs, len, retlen, buf); 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds if ( (ret == -EBADMSG) && (*retlen == len) ) { 9081da177e4SLinus Torvalds printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n", 9091da177e4SLinus Torvalds len, ofs); 9101da177e4SLinus Torvalds /* 9111da177e4SLinus Torvalds * We have the raw data without ECC correction in the buffer, maybe 9121da177e4SLinus Torvalds * we are lucky and all data or parts are correct. We check the node. 9131da177e4SLinus Torvalds * If data are corrupted node check will sort it out. 9141da177e4SLinus Torvalds * We keep this block, it will fail on write or erase and the we 9151da177e4SLinus Torvalds * mark it bad. Or should we do that now? But we should give him a chance. 9161da177e4SLinus Torvalds * Maybe we had a system crash or power loss before the ecc write or 9171da177e4SLinus Torvalds * a erase was completed. 9181da177e4SLinus Torvalds * So we return success. :) 9191da177e4SLinus Torvalds */ 9201da177e4SLinus Torvalds ret = 0; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds /* if no writebuffer available or write buffer empty, return */ 9241da177e4SLinus Torvalds if (!c->wbuf_pagesize || !c->wbuf_len) 925894214d1SArtem B. Bityuckiy goto exit; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds /* if we read in a different block, return */ 9283be36675SAndrew Victor if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs)) 929894214d1SArtem B. Bityuckiy goto exit; 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds if (ofs >= c->wbuf_ofs) { 9321da177e4SLinus Torvalds owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */ 9331da177e4SLinus Torvalds if (owbf > c->wbuf_len) /* is read beyond write buffer ? */ 9341da177e4SLinus Torvalds goto exit; 9351da177e4SLinus Torvalds lwbf = c->wbuf_len - owbf; /* number of bytes to copy */ 9361da177e4SLinus Torvalds if (lwbf > len) 9371da177e4SLinus Torvalds lwbf = len; 9381da177e4SLinus Torvalds } else { 9391da177e4SLinus Torvalds orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */ 9401da177e4SLinus Torvalds if (orbf > len) /* is write beyond write buffer ? */ 9411da177e4SLinus Torvalds goto exit; 9421da177e4SLinus Torvalds lwbf = len - orbf; /* number of bytes to copy */ 9431da177e4SLinus Torvalds if (lwbf > c->wbuf_len) 9441da177e4SLinus Torvalds lwbf = c->wbuf_len; 9451da177e4SLinus Torvalds } 9461da177e4SLinus Torvalds if (lwbf > 0) 9471da177e4SLinus Torvalds memcpy(buf+orbf,c->wbuf+owbf,lwbf); 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds exit: 9501da177e4SLinus Torvalds up_read(&c->wbuf_sem); 9511da177e4SLinus Torvalds return ret; 9521da177e4SLinus Torvalds } 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds /* 9551da177e4SLinus Torvalds * Check, if the out of band area is empty 9561da177e4SLinus Torvalds */ 9571da177e4SLinus Torvalds int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int mode) 9581da177e4SLinus Torvalds { 9591da177e4SLinus Torvalds unsigned char *buf; 9601da177e4SLinus Torvalds int ret = 0; 9611da177e4SLinus Torvalds int i,len,page; 9621da177e4SLinus Torvalds size_t retlen; 9631da177e4SLinus Torvalds int oob_size; 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds /* allocate a buffer for all oob data in this sector */ 9661da177e4SLinus Torvalds oob_size = c->mtd->oobsize; 9671da177e4SLinus Torvalds len = 4 * oob_size; 9681da177e4SLinus Torvalds buf = kmalloc(len, GFP_KERNEL); 9691da177e4SLinus Torvalds if (!buf) { 9701da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_check_oob_empty(): allocation of temporary data buffer for oob check failed\n"); 9711da177e4SLinus Torvalds return -ENOMEM; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds /* 9741da177e4SLinus Torvalds * if mode = 0, we scan for a total empty oob area, else we have 9751da177e4SLinus Torvalds * to take care of the cleanmarker in the first page of the block 9761da177e4SLinus Torvalds */ 9771da177e4SLinus Torvalds ret = jffs2_flash_read_oob(c, jeb->offset, len , &retlen, buf); 9781da177e4SLinus Torvalds if (ret) { 9791da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB failed %d for block at %08x\n", ret, jeb->offset)); 9801da177e4SLinus Torvalds goto out; 9811da177e4SLinus Torvalds } 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds if (retlen < len) { 9841da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB return short read " 9851da177e4SLinus Torvalds "(%zd bytes not %d) for block at %08x\n", retlen, len, jeb->offset)); 9861da177e4SLinus Torvalds ret = -EIO; 9871da177e4SLinus Torvalds goto out; 9881da177e4SLinus Torvalds } 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds /* Special check for first page */ 9911da177e4SLinus Torvalds for(i = 0; i < oob_size ; i++) { 9921da177e4SLinus Torvalds /* Yeah, we know about the cleanmarker. */ 9931da177e4SLinus Torvalds if (mode && i >= c->fsdata_pos && 9941da177e4SLinus Torvalds i < c->fsdata_pos + c->fsdata_len) 9951da177e4SLinus Torvalds continue; 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds if (buf[i] != 0xFF) { 9981da177e4SLinus Torvalds D2(printk(KERN_DEBUG "Found %02x at %x in OOB for %08x\n", 999730554d9SArtem B. Bityutskiy buf[i], i, jeb->offset)); 10001da177e4SLinus Torvalds ret = 1; 10011da177e4SLinus Torvalds goto out; 10021da177e4SLinus Torvalds } 10031da177e4SLinus Torvalds } 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds /* we know, we are aligned :) */ 10061da177e4SLinus Torvalds for (page = oob_size; page < len; page += sizeof(long)) { 10071da177e4SLinus Torvalds unsigned long dat = *(unsigned long *)(&buf[page]); 10081da177e4SLinus Torvalds if(dat != -1) { 10091da177e4SLinus Torvalds ret = 1; 10101da177e4SLinus Torvalds goto out; 10111da177e4SLinus Torvalds } 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds out: 10151da177e4SLinus Torvalds kfree(buf); 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds return ret; 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds /* 10211da177e4SLinus Torvalds * Scan for a valid cleanmarker and for bad blocks 10221da177e4SLinus Torvalds * For virtual blocks (concatenated physical blocks) check the cleanmarker 10231da177e4SLinus Torvalds * only in the first page of the first physical block, but scan for bad blocks in all 10241da177e4SLinus Torvalds * physical blocks 10251da177e4SLinus Torvalds */ 10261da177e4SLinus Torvalds int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 10271da177e4SLinus Torvalds { 10281da177e4SLinus Torvalds struct jffs2_unknown_node n; 10291da177e4SLinus Torvalds unsigned char buf[2 * NAND_MAX_OOBSIZE]; 10301da177e4SLinus Torvalds unsigned char *p; 10311da177e4SLinus Torvalds int ret, i, cnt, retval = 0; 10321da177e4SLinus Torvalds size_t retlen, offset; 10331da177e4SLinus Torvalds int oob_size; 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds offset = jeb->offset; 10361da177e4SLinus Torvalds oob_size = c->mtd->oobsize; 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds /* Loop through the physical blocks */ 10391da177e4SLinus Torvalds for (cnt = 0; cnt < (c->sector_size / c->mtd->erasesize); cnt++) { 10401da177e4SLinus Torvalds /* Check first if the block is bad. */ 10411da177e4SLinus Torvalds if (c->mtd->block_isbad (c->mtd, offset)) { 10421da177e4SLinus Torvalds D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Bad block at %08x\n", jeb->offset)); 10431da177e4SLinus Torvalds return 2; 10441da177e4SLinus Torvalds } 10451da177e4SLinus Torvalds /* 10461da177e4SLinus Torvalds * We read oob data from page 0 and 1 of the block. 10471da177e4SLinus Torvalds * page 0 contains cleanmarker and badblock info 10481da177e4SLinus Torvalds * page 1 contains failure count of this block 10491da177e4SLinus Torvalds */ 10501da177e4SLinus Torvalds ret = c->mtd->read_oob (c->mtd, offset, oob_size << 1, &retlen, buf); 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds if (ret) { 10531da177e4SLinus Torvalds D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB failed %d for block at %08x\n", ret, jeb->offset)); 10541da177e4SLinus Torvalds return ret; 10551da177e4SLinus Torvalds } 10561da177e4SLinus Torvalds if (retlen < (oob_size << 1)) { 10571da177e4SLinus Torvalds D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB return short read (%zd bytes not %d) for block at %08x\n", retlen, oob_size << 1, jeb->offset)); 10581da177e4SLinus Torvalds return -EIO; 10591da177e4SLinus Torvalds } 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds /* Check cleanmarker only on the first physical block */ 10621da177e4SLinus Torvalds if (!cnt) { 10631da177e4SLinus Torvalds n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK); 10641da177e4SLinus Torvalds n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER); 10651da177e4SLinus Torvalds n.totlen = cpu_to_je32 (8); 10661da177e4SLinus Torvalds p = (unsigned char *) &n; 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds for (i = 0; i < c->fsdata_len; i++) { 10691da177e4SLinus Torvalds if (buf[c->fsdata_pos + i] != p[i]) { 10701da177e4SLinus Torvalds retval = 1; 10711da177e4SLinus Torvalds } 10721da177e4SLinus Torvalds } 10731da177e4SLinus Torvalds D1(if (retval == 1) { 10741da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): Cleanmarker node not detected in block at %08x\n", jeb->offset); 10759bfeb691SDavid Woodhouse printk(KERN_WARNING "OOB at %08zx was ", offset); 10761da177e4SLinus Torvalds for (i=0; i < oob_size; i++) { 10771da177e4SLinus Torvalds printk("%02x ", buf[i]); 10781da177e4SLinus Torvalds } 10791da177e4SLinus Torvalds printk("\n"); 10801da177e4SLinus Torvalds }) 10811da177e4SLinus Torvalds } 10821da177e4SLinus Torvalds offset += c->mtd->erasesize; 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds return retval; 10851da177e4SLinus Torvalds } 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 10881da177e4SLinus Torvalds { 10891da177e4SLinus Torvalds struct jffs2_unknown_node n; 10901da177e4SLinus Torvalds int ret; 10911da177e4SLinus Torvalds size_t retlen; 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 10941da177e4SLinus Torvalds n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER); 10951da177e4SLinus Torvalds n.totlen = cpu_to_je32(8); 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds ret = jffs2_flash_write_oob(c, jeb->offset + c->fsdata_pos, c->fsdata_len, &retlen, (unsigned char *)&n); 10981da177e4SLinus Torvalds 10991da177e4SLinus Torvalds if (ret) { 11001da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); 11011da177e4SLinus Torvalds return ret; 11021da177e4SLinus Torvalds } 11031da177e4SLinus Torvalds if (retlen != c->fsdata_len) { 11041da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Short write for block at %08x: %zd not %d\n", jeb->offset, retlen, c->fsdata_len)); 11051da177e4SLinus Torvalds return ret; 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds return 0; 11081da177e4SLinus Torvalds } 11091da177e4SLinus Torvalds 11101da177e4SLinus Torvalds /* 11111da177e4SLinus Torvalds * On NAND we try to mark this block bad. If the block was erased more 11121da177e4SLinus Torvalds * than MAX_ERASE_FAILURES we mark it finaly bad. 11131da177e4SLinus Torvalds * Don't care about failures. This block remains on the erase-pending 11141da177e4SLinus Torvalds * or badblock list as long as nobody manipulates the flash with 11151da177e4SLinus Torvalds * a bootloader or something like that. 11161da177e4SLinus Torvalds */ 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset) 11191da177e4SLinus Torvalds { 11201da177e4SLinus Torvalds int ret; 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds /* if the count is < max, we try to write the counter to the 2nd page oob area */ 11231da177e4SLinus Torvalds if( ++jeb->bad_count < MAX_ERASE_FAILURES) 11241da177e4SLinus Torvalds return 0; 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds if (!c->mtd->block_markbad) 11271da177e4SLinus Torvalds return 1; // What else can we do? 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset)); 11301da177e4SLinus Torvalds ret = c->mtd->block_markbad(c->mtd, bad_offset); 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds if (ret) { 11331da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); 11341da177e4SLinus Torvalds return ret; 11351da177e4SLinus Torvalds } 11361da177e4SLinus Torvalds return 1; 11371da177e4SLinus Torvalds } 11381da177e4SLinus Torvalds 11391da177e4SLinus Torvalds #define NAND_JFFS2_OOB16_FSDALEN 8 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds static struct nand_oobinfo jffs2_oobinfo_docecc = { 11421da177e4SLinus Torvalds .useecc = MTD_NANDECC_PLACE, 11431da177e4SLinus Torvalds .eccbytes = 6, 11441da177e4SLinus Torvalds .eccpos = {0,1,2,3,4,5} 11451da177e4SLinus Torvalds }; 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds 11481da177e4SLinus Torvalds static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c) 11491da177e4SLinus Torvalds { 11501da177e4SLinus Torvalds struct nand_oobinfo *oinfo = &c->mtd->oobinfo; 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds /* Do this only, if we have an oob buffer */ 11531da177e4SLinus Torvalds if (!c->mtd->oobsize) 11541da177e4SLinus Torvalds return 0; 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds /* Cleanmarker is out-of-band, so inline size zero */ 11571da177e4SLinus Torvalds c->cleanmarker_size = 0; 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds /* Should we use autoplacement ? */ 11601da177e4SLinus Torvalds if (oinfo && oinfo->useecc == MTD_NANDECC_AUTOPLACE) { 11611da177e4SLinus Torvalds D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n")); 11621da177e4SLinus Torvalds /* Get the position of the free bytes */ 11631da177e4SLinus Torvalds if (!oinfo->oobfree[0][1]) { 11641da177e4SLinus Torvalds printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep. Autoplacement selected and no empty space in oob\n"); 11651da177e4SLinus Torvalds return -ENOSPC; 11661da177e4SLinus Torvalds } 11671da177e4SLinus Torvalds c->fsdata_pos = oinfo->oobfree[0][0]; 11681da177e4SLinus Torvalds c->fsdata_len = oinfo->oobfree[0][1]; 11691da177e4SLinus Torvalds if (c->fsdata_len > 8) 11701da177e4SLinus Torvalds c->fsdata_len = 8; 11711da177e4SLinus Torvalds } else { 11721da177e4SLinus Torvalds /* This is just a legacy fallback and should go away soon */ 11731da177e4SLinus Torvalds switch(c->mtd->ecctype) { 11741da177e4SLinus Torvalds case MTD_ECC_RS_DiskOnChip: 11751da177e4SLinus Torvalds printk(KERN_WARNING "JFFS2 using DiskOnChip hardware ECC without autoplacement. Fix it!\n"); 11761da177e4SLinus Torvalds c->oobinfo = &jffs2_oobinfo_docecc; 11771da177e4SLinus Torvalds c->fsdata_pos = 6; 11781da177e4SLinus Torvalds c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN; 11791da177e4SLinus Torvalds c->badblock_pos = 15; 11801da177e4SLinus Torvalds break; 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds default: 11831da177e4SLinus Torvalds D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n")); 11841da177e4SLinus Torvalds return -EINVAL; 11851da177e4SLinus Torvalds } 11861da177e4SLinus Torvalds } 11871da177e4SLinus Torvalds return 0; 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds int jffs2_nand_flash_setup(struct jffs2_sb_info *c) 11911da177e4SLinus Torvalds { 11921da177e4SLinus Torvalds int res; 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds /* Initialise write buffer */ 11951da177e4SLinus Torvalds init_rwsem(&c->wbuf_sem); 119628318776SJoern Engel c->wbuf_pagesize = c->mtd->writesize; 11971da177e4SLinus Torvalds c->wbuf_ofs = 0xFFFFFFFF; 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 12001da177e4SLinus Torvalds if (!c->wbuf) 12011da177e4SLinus Torvalds return -ENOMEM; 12021da177e4SLinus Torvalds 12031da177e4SLinus Torvalds res = jffs2_nand_set_oobinfo(c); 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds #ifdef BREAKME 12061da177e4SLinus Torvalds if (!brokenbuf) 12071da177e4SLinus Torvalds brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 12081da177e4SLinus Torvalds if (!brokenbuf) { 12091da177e4SLinus Torvalds kfree(c->wbuf); 12101da177e4SLinus Torvalds return -ENOMEM; 12111da177e4SLinus Torvalds } 12121da177e4SLinus Torvalds memset(brokenbuf, 0xdb, c->wbuf_pagesize); 12131da177e4SLinus Torvalds #endif 12141da177e4SLinus Torvalds return res; 12151da177e4SLinus Torvalds } 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c) 12181da177e4SLinus Torvalds { 12191da177e4SLinus Torvalds kfree(c->wbuf); 12201da177e4SLinus Torvalds } 12211da177e4SLinus Torvalds 12228f15fd55SAndrew Victor int jffs2_dataflash_setup(struct jffs2_sb_info *c) { 12238f15fd55SAndrew Victor c->cleanmarker_size = 0; /* No cleanmarkers needed */ 12248f15fd55SAndrew Victor 12258f15fd55SAndrew Victor /* Initialize write buffer */ 12268f15fd55SAndrew Victor init_rwsem(&c->wbuf_sem); 12278f15fd55SAndrew Victor 1228daba5cc4SArtem B. Bityutskiy 1229daba5cc4SArtem B. Bityutskiy c->wbuf_pagesize = c->mtd->erasesize; 1230daba5cc4SArtem B. Bityutskiy 1231daba5cc4SArtem B. Bityutskiy /* Find a suitable c->sector_size 1232daba5cc4SArtem B. Bityutskiy * - Not too much sectors 1233daba5cc4SArtem B. Bityutskiy * - Sectors have to be at least 4 K + some bytes 1234daba5cc4SArtem B. Bityutskiy * - All known dataflashes have erase sizes of 528 or 1056 1235daba5cc4SArtem B. Bityutskiy * - we take at least 8 eraseblocks and want to have at least 8K size 1236daba5cc4SArtem B. Bityutskiy * - The concatenation should be a power of 2 1237daba5cc4SArtem B. Bityutskiy */ 1238daba5cc4SArtem B. Bityutskiy 1239daba5cc4SArtem B. Bityutskiy c->sector_size = 8 * c->mtd->erasesize; 1240daba5cc4SArtem B. Bityutskiy 1241daba5cc4SArtem B. Bityutskiy while (c->sector_size < 8192) { 1242daba5cc4SArtem B. Bityutskiy c->sector_size *= 2; 1243daba5cc4SArtem B. Bityutskiy } 1244daba5cc4SArtem B. Bityutskiy 1245daba5cc4SArtem B. Bityutskiy /* It may be necessary to adjust the flash size */ 1246daba5cc4SArtem B. Bityutskiy c->flash_size = c->mtd->size; 1247daba5cc4SArtem B. Bityutskiy 1248daba5cc4SArtem B. Bityutskiy if ((c->flash_size % c->sector_size) != 0) { 1249daba5cc4SArtem B. Bityutskiy c->flash_size = (c->flash_size / c->sector_size) * c->sector_size; 1250daba5cc4SArtem B. Bityutskiy printk(KERN_WARNING "JFFS2 flash size adjusted to %dKiB\n", c->flash_size); 1251daba5cc4SArtem B. Bityutskiy }; 1252daba5cc4SArtem B. Bityutskiy 1253daba5cc4SArtem B. Bityutskiy c->wbuf_ofs = 0xFFFFFFFF; 12548f15fd55SAndrew Victor c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 12558f15fd55SAndrew Victor if (!c->wbuf) 12568f15fd55SAndrew Victor return -ENOMEM; 12578f15fd55SAndrew Victor 1258daba5cc4SArtem B. Bityutskiy printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size); 12598f15fd55SAndrew Victor 12608f15fd55SAndrew Victor return 0; 12618f15fd55SAndrew Victor } 12628f15fd55SAndrew Victor 12638f15fd55SAndrew Victor void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) { 12648f15fd55SAndrew Victor kfree(c->wbuf); 12658f15fd55SAndrew Victor } 12668f15fd55SAndrew Victor 126759da721aSNicolas Pitre int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) { 1268c8b229deSJoern Engel /* Cleanmarker currently occupies whole programming regions, 1269c8b229deSJoern Engel * either one or 2 for 8Byte STMicro flashes. */ 1270c8b229deSJoern Engel c->cleanmarker_size = max(16u, c->mtd->writesize); 127159da721aSNicolas Pitre 127259da721aSNicolas Pitre /* Initialize write buffer */ 127359da721aSNicolas Pitre init_rwsem(&c->wbuf_sem); 127428318776SJoern Engel c->wbuf_pagesize = c->mtd->writesize; 127559da721aSNicolas Pitre c->wbuf_ofs = 0xFFFFFFFF; 127659da721aSNicolas Pitre 127759da721aSNicolas Pitre c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 127859da721aSNicolas Pitre if (!c->wbuf) 127959da721aSNicolas Pitre return -ENOMEM; 128059da721aSNicolas Pitre 128159da721aSNicolas Pitre return 0; 128259da721aSNicolas Pitre } 128359da721aSNicolas Pitre 128459da721aSNicolas Pitre void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) { 128559da721aSNicolas Pitre kfree(c->wbuf); 128659da721aSNicolas Pitre } 1287