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 * 12894214d1SArtem B. Bityuckiy * $Id: wbuf.c,v 1.92 2005/04/05 12:51:54 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 331da177e4SLinus Torvalds /* max. erase failures before we mark a block bad */ 341da177e4SLinus Torvalds #define MAX_ERASE_FAILURES 2 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds /* two seconds timeout for timed wbuf-flushing */ 371da177e4SLinus Torvalds #define WBUF_FLUSH_TIMEOUT 2 * HZ 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 D2(jffs2_dump_block_lists(c)); 1431da177e4SLinus Torvalds /* File the existing block on the bad_used_list.... */ 1441da177e4SLinus Torvalds if (c->nextblock == jeb) 1451da177e4SLinus Torvalds c->nextblock = NULL; 1461da177e4SLinus Torvalds else /* Not sure this should ever happen... need more coffee */ 1471da177e4SLinus Torvalds list_del(&jeb->list); 1481da177e4SLinus Torvalds if (jeb->first_node) { 1491da177e4SLinus Torvalds D1(printk("Refiling block at %08x to bad_used_list\n", jeb->offset)); 1501da177e4SLinus Torvalds list_add(&jeb->list, &c->bad_used_list); 1511da177e4SLinus Torvalds } else { 1529b88f473SEstelle Hammache BUG_ON(allow_empty == REFILE_NOTEMPTY); 1531da177e4SLinus Torvalds /* It has to have had some nodes or we couldn't be here */ 1541da177e4SLinus Torvalds D1(printk("Refiling block at %08x to erase_pending_list\n", jeb->offset)); 1551da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 1561da177e4SLinus Torvalds c->nr_erasing_blocks++; 1571da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds D2(jffs2_dump_block_lists(c)); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* Adjust its size counts accordingly */ 1621da177e4SLinus Torvalds c->wasted_size += jeb->free_size; 1631da177e4SLinus Torvalds c->free_size -= jeb->free_size; 1641da177e4SLinus Torvalds jeb->wasted_size += jeb->free_size; 1651da177e4SLinus Torvalds jeb->free_size = 0; 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds ACCT_SANITY_CHECK(c,jeb); 1681da177e4SLinus Torvalds D1(ACCT_PARANOIA_CHECK(jeb)); 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* Recover from failure to write wbuf. Recover the nodes up to the 1721da177e4SLinus Torvalds * wbuf, not the one which we were starting to try to write. */ 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds static void jffs2_wbuf_recover(struct jffs2_sb_info *c) 1751da177e4SLinus Torvalds { 1761da177e4SLinus Torvalds struct jffs2_eraseblock *jeb, *new_jeb; 1771da177e4SLinus Torvalds struct jffs2_raw_node_ref **first_raw, **raw; 1781da177e4SLinus Torvalds size_t retlen; 1791da177e4SLinus Torvalds int ret; 1801da177e4SLinus Torvalds unsigned char *buf; 1811da177e4SLinus Torvalds uint32_t start, end, ofs, len; 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; 1861da177e4SLinus Torvalds 1877f716cf3SEstelle Hammache jffs2_block_refile(c, jeb, REFILE_NOTEMPTY); 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* Find the first node to be recovered, by skipping over every 1901da177e4SLinus Torvalds node which ends before the wbuf starts, or which is obsolete. */ 1911da177e4SLinus Torvalds first_raw = &jeb->first_node; 1921da177e4SLinus Torvalds while (*first_raw && 1931da177e4SLinus Torvalds (ref_obsolete(*first_raw) || 1941da177e4SLinus Torvalds (ref_offset(*first_raw)+ref_totlen(c, jeb, *first_raw)) < c->wbuf_ofs)) { 1951da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n", 1961da177e4SLinus Torvalds ref_offset(*first_raw), ref_flags(*first_raw), 1971da177e4SLinus Torvalds (ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw)), 1981da177e4SLinus Torvalds c->wbuf_ofs)); 1991da177e4SLinus Torvalds first_raw = &(*first_raw)->next_phys; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds if (!*first_raw) { 2031da177e4SLinus Torvalds /* All nodes were obsolete. Nothing to recover. */ 2041da177e4SLinus Torvalds D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n")); 2051da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 2061da177e4SLinus Torvalds return; 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds start = ref_offset(*first_raw); 2101da177e4SLinus Torvalds end = ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* Find the last node to be recovered */ 2131da177e4SLinus Torvalds raw = first_raw; 2141da177e4SLinus Torvalds while ((*raw)) { 2151da177e4SLinus Torvalds if (!ref_obsolete(*raw)) 2161da177e4SLinus Torvalds end = ref_offset(*raw) + ref_totlen(c, jeb, *raw); 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds raw = &(*raw)->next_phys; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds D1(printk(KERN_DEBUG "wbuf recover %08x-%08x\n", start, end)); 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds buf = NULL; 2251da177e4SLinus Torvalds if (start < c->wbuf_ofs) { 2261da177e4SLinus Torvalds /* First affected node was already partially written. 2271da177e4SLinus Torvalds * Attempt to reread the old data into our buffer. */ 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds buf = kmalloc(end - start, GFP_KERNEL); 2301da177e4SLinus Torvalds if (!buf) { 2311da177e4SLinus Torvalds printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n"); 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds goto read_failed; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds /* Do the read... */ 2371da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 2381da177e4SLinus Torvalds ret = c->mtd->read_ecc(c->mtd, start, c->wbuf_ofs - start, &retlen, buf, NULL, c->oobinfo); 2391da177e4SLinus Torvalds else 2401da177e4SLinus Torvalds ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf); 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) { 2431da177e4SLinus Torvalds /* ECC recovered */ 2441da177e4SLinus Torvalds ret = 0; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds if (ret || retlen != c->wbuf_ofs - start) { 2471da177e4SLinus Torvalds printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n"); 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds kfree(buf); 2501da177e4SLinus Torvalds buf = NULL; 2511da177e4SLinus Torvalds read_failed: 2521da177e4SLinus Torvalds first_raw = &(*first_raw)->next_phys; 2531da177e4SLinus Torvalds /* If this was the only node to be recovered, give up */ 2541da177e4SLinus Torvalds if (!(*first_raw)) 2551da177e4SLinus Torvalds return; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds /* It wasn't. Go on and try to recover nodes complete in the wbuf */ 2581da177e4SLinus Torvalds start = ref_offset(*first_raw); 2591da177e4SLinus Torvalds } else { 2601da177e4SLinus Torvalds /* Read succeeded. Copy the remaining data from the wbuf */ 2611da177e4SLinus Torvalds memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs); 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards. 2651da177e4SLinus Torvalds Either 'buf' contains the data, or we find it in the wbuf */ 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds /* ... and get an allocation of space from a shiny new block instead */ 2691da177e4SLinus Torvalds ret = jffs2_reserve_space_gc(c, end-start, &ofs, &len); 2701da177e4SLinus Torvalds if (ret) { 2711da177e4SLinus Torvalds printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n"); 2721da177e4SLinus Torvalds kfree(buf); 2731da177e4SLinus Torvalds return; 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds if (end-start >= c->wbuf_pagesize) { 2767f716cf3SEstelle Hammache /* Need to do another write immediately, but it's possible 2777f716cf3SEstelle Hammache that this is just because the wbuf itself is completely 2787f716cf3SEstelle Hammache full, and there's nothing earlier read back from the 2797f716cf3SEstelle Hammache flash. Hence 'buf' isn't necessarily what we're writing 2807f716cf3SEstelle Hammache from. */ 2817f716cf3SEstelle Hammache unsigned char *rewrite_buf = buf?:c->wbuf; 2821da177e4SLinus Torvalds uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize); 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n", 2851da177e4SLinus Torvalds towrite, ofs)); 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds #ifdef BREAKMEHEADER 2881da177e4SLinus Torvalds static int breakme; 2891da177e4SLinus Torvalds if (breakme++ == 20) { 2901da177e4SLinus Torvalds printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs); 2911da177e4SLinus Torvalds breakme = 0; 2921da177e4SLinus Torvalds c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen, 2931da177e4SLinus Torvalds brokenbuf, NULL, c->oobinfo); 2941da177e4SLinus Torvalds ret = -EIO; 2951da177e4SLinus Torvalds } else 2961da177e4SLinus Torvalds #endif 2971da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 2981da177e4SLinus Torvalds ret = c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen, 2997f716cf3SEstelle Hammache rewrite_buf, NULL, c->oobinfo); 3001da177e4SLinus Torvalds else 3017f716cf3SEstelle Hammache ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, rewrite_buf); 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds if (ret || retlen != towrite) { 3041da177e4SLinus Torvalds /* Argh. We tried. Really we did. */ 3051da177e4SLinus Torvalds printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n"); 3061da177e4SLinus Torvalds kfree(buf); 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds if (retlen) { 3091da177e4SLinus Torvalds struct jffs2_raw_node_ref *raw2; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds raw2 = jffs2_alloc_raw_node_ref(); 3121da177e4SLinus Torvalds if (!raw2) 3131da177e4SLinus Torvalds return; 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds raw2->flash_offset = ofs | REF_OBSOLETE; 3161da177e4SLinus Torvalds raw2->__totlen = ref_totlen(c, jeb, *first_raw); 3171da177e4SLinus Torvalds raw2->next_phys = NULL; 3181da177e4SLinus Torvalds raw2->next_in_ino = NULL; 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds jffs2_add_physical_node_ref(c, raw2); 3211da177e4SLinus Torvalds } 3221da177e4SLinus Torvalds return; 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs); 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds c->wbuf_len = (end - start) - towrite; 3271da177e4SLinus Torvalds c->wbuf_ofs = ofs + towrite; 3287f716cf3SEstelle Hammache memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len); 3291da177e4SLinus Torvalds /* Don't muck about with c->wbuf_inodes. False positives are harmless. */ 3307f716cf3SEstelle Hammache if (buf) 3311da177e4SLinus Torvalds kfree(buf); 3321da177e4SLinus Torvalds } else { 3331da177e4SLinus Torvalds /* OK, now we're left with the dregs in whichever buffer we're using */ 3341da177e4SLinus Torvalds if (buf) { 3351da177e4SLinus Torvalds memcpy(c->wbuf, buf, end-start); 3361da177e4SLinus Torvalds kfree(buf); 3371da177e4SLinus Torvalds } else { 3381da177e4SLinus Torvalds memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start); 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds c->wbuf_ofs = ofs; 3411da177e4SLinus Torvalds c->wbuf_len = end - start; 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */ 3451da177e4SLinus Torvalds new_jeb = &c->blocks[ofs / c->sector_size]; 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 3481da177e4SLinus Torvalds if (new_jeb->first_node) { 3491da177e4SLinus Torvalds /* Odd, but possible with ST flash later maybe */ 3501da177e4SLinus Torvalds new_jeb->last_node->next_phys = *first_raw; 3511da177e4SLinus Torvalds } else { 3521da177e4SLinus Torvalds new_jeb->first_node = *first_raw; 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds raw = first_raw; 3561da177e4SLinus Torvalds while (*raw) { 3571da177e4SLinus Torvalds uint32_t rawlen = ref_totlen(c, jeb, *raw); 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n", 3601da177e4SLinus Torvalds rawlen, ref_offset(*raw), ref_flags(*raw), ofs)); 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds if (ref_obsolete(*raw)) { 3631da177e4SLinus Torvalds /* Shouldn't really happen much */ 3641da177e4SLinus Torvalds new_jeb->dirty_size += rawlen; 3651da177e4SLinus Torvalds new_jeb->free_size -= rawlen; 3661da177e4SLinus Torvalds c->dirty_size += rawlen; 3671da177e4SLinus Torvalds } else { 3681da177e4SLinus Torvalds new_jeb->used_size += rawlen; 3691da177e4SLinus Torvalds new_jeb->free_size -= rawlen; 3701da177e4SLinus Torvalds jeb->dirty_size += rawlen; 3711da177e4SLinus Torvalds jeb->used_size -= rawlen; 3721da177e4SLinus Torvalds c->dirty_size += rawlen; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds c->free_size -= rawlen; 3751da177e4SLinus Torvalds (*raw)->flash_offset = ofs | ref_flags(*raw); 3761da177e4SLinus Torvalds ofs += rawlen; 3771da177e4SLinus Torvalds new_jeb->last_node = *raw; 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds raw = &(*raw)->next_phys; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* Fix up the original jeb now it's on the bad_list */ 3831da177e4SLinus Torvalds *first_raw = NULL; 3841da177e4SLinus Torvalds if (first_raw == &jeb->first_node) { 3851da177e4SLinus Torvalds jeb->last_node = NULL; 3861da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset)); 3871da177e4SLinus Torvalds list_del(&jeb->list); 3881da177e4SLinus Torvalds list_add(&jeb->list, &c->erase_pending_list); 3891da177e4SLinus Torvalds c->nr_erasing_blocks++; 3901da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds else 3931da177e4SLinus Torvalds jeb->last_node = container_of(first_raw, struct jffs2_raw_node_ref, next_phys); 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds ACCT_SANITY_CHECK(c,jeb); 3961da177e4SLinus Torvalds D1(ACCT_PARANOIA_CHECK(jeb)); 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds ACCT_SANITY_CHECK(c,new_jeb); 3991da177e4SLinus Torvalds D1(ACCT_PARANOIA_CHECK(new_jeb)); 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds D1(printk(KERN_DEBUG "wbuf recovery completed OK\n")); 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* Meaning of pad argument: 4071da177e4SLinus Torvalds 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway. 4081da177e4SLinus Torvalds 1: Pad, do not adjust nextblock free_size 4091da177e4SLinus Torvalds 2: Pad, adjust nextblock free_size 4101da177e4SLinus Torvalds */ 4111da177e4SLinus Torvalds #define NOPAD 0 4121da177e4SLinus Torvalds #define PAD_NOACCOUNT 1 4131da177e4SLinus Torvalds #define PAD_ACCOUNTING 2 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad) 4161da177e4SLinus Torvalds { 4171da177e4SLinus Torvalds int ret; 4181da177e4SLinus Torvalds size_t retlen; 4191da177e4SLinus Torvalds 4203be36675SAndrew Victor /* Nothing to do if not write-buffering the flash. In particular, we shouldn't 4211da177e4SLinus Torvalds del_timer() the timer we never initialised. */ 4223be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 4231da177e4SLinus Torvalds return 0; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds if (!down_trylock(&c->alloc_sem)) { 4261da177e4SLinus Torvalds up(&c->alloc_sem); 4271da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n"); 4281da177e4SLinus Torvalds BUG(); 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds 4313be36675SAndrew Victor if (!c->wbuf_len) /* already checked c->wbuf above */ 4321da177e4SLinus Torvalds return 0; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds /* claim remaining space on the page 4351da177e4SLinus Torvalds this happens, if we have a change to a new block, 4361da177e4SLinus Torvalds or if fsync forces us to flush the writebuffer. 4371da177e4SLinus Torvalds if we have a switch to next page, we will not have 4381da177e4SLinus Torvalds enough remaining space for this. 4391da177e4SLinus Torvalds */ 4408f15fd55SAndrew Victor if (pad && !jffs2_dataflash(c)) { 4411da177e4SLinus Torvalds c->wbuf_len = PAD(c->wbuf_len); 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR 4441da177e4SLinus Torvalds with 8 byte page size */ 4451da177e4SLinus Torvalds memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len); 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) { 4481da177e4SLinus Torvalds struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len); 4491da177e4SLinus Torvalds padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 4501da177e4SLinus Torvalds padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING); 4511da177e4SLinus Torvalds padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len); 4521da177e4SLinus Torvalds padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4)); 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds /* else jffs2_flash_writev has actually filled in the rest of the 4561da177e4SLinus Torvalds buffer for us, and will deal with the node refs etc. later. */ 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds #ifdef BREAKME 4591da177e4SLinus Torvalds static int breakme; 4601da177e4SLinus Torvalds if (breakme++ == 20) { 4611da177e4SLinus Torvalds printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs); 4621da177e4SLinus Torvalds breakme = 0; 4631da177e4SLinus Torvalds c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, 4641da177e4SLinus Torvalds &retlen, brokenbuf, NULL, c->oobinfo); 4651da177e4SLinus Torvalds ret = -EIO; 4661da177e4SLinus Torvalds } else 4671da177e4SLinus Torvalds #endif 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 4701da177e4SLinus Torvalds ret = c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf, NULL, c->oobinfo); 4711da177e4SLinus Torvalds else 4721da177e4SLinus Torvalds ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf); 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds if (ret || retlen != c->wbuf_pagesize) { 4751da177e4SLinus Torvalds if (ret) 4761da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret); 4771da177e4SLinus Torvalds else { 4781da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n", 4791da177e4SLinus Torvalds retlen, c->wbuf_pagesize); 4801da177e4SLinus Torvalds ret = -EIO; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds jffs2_wbuf_recover(c); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds return ret; 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* Adjust free size of the block if we padded. */ 4918f15fd55SAndrew Victor if (pad && !jffs2_dataflash(c)) { 4921da177e4SLinus Torvalds struct jffs2_eraseblock *jeb; 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds jeb = &c->blocks[c->wbuf_ofs / c->sector_size]; 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n", 4971da177e4SLinus Torvalds (jeb==c->nextblock)?"next":"", jeb->offset)); 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /* wbuf_pagesize - wbuf_len is the amount of space that's to be 5001da177e4SLinus Torvalds padded. If there is less free space in the block than that, 5011da177e4SLinus Torvalds something screwed up */ 5021da177e4SLinus Torvalds if (jeb->free_size < (c->wbuf_pagesize - c->wbuf_len)) { 5031da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n", 5041da177e4SLinus Torvalds c->wbuf_ofs, c->wbuf_len, c->wbuf_pagesize-c->wbuf_len); 5051da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n", 5061da177e4SLinus Torvalds jeb->offset, jeb->free_size); 5071da177e4SLinus Torvalds BUG(); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds jeb->free_size -= (c->wbuf_pagesize - c->wbuf_len); 5101da177e4SLinus Torvalds c->free_size -= (c->wbuf_pagesize - c->wbuf_len); 5111da177e4SLinus Torvalds jeb->wasted_size += (c->wbuf_pagesize - c->wbuf_len); 5121da177e4SLinus Torvalds c->wasted_size += (c->wbuf_pagesize - c->wbuf_len); 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds /* Stick any now-obsoleted blocks on the erase_pending_list */ 5161da177e4SLinus Torvalds jffs2_refile_wbuf_blocks(c); 5171da177e4SLinus Torvalds jffs2_clear_wbuf_ino_list(c); 5181da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds memset(c->wbuf,0xff,c->wbuf_pagesize); 5211da177e4SLinus Torvalds /* adjust write buffer offset, else we get a non contiguous write bug */ 5221da177e4SLinus Torvalds c->wbuf_ofs += c->wbuf_pagesize; 5231da177e4SLinus Torvalds c->wbuf_len = 0; 5241da177e4SLinus Torvalds return 0; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds /* Trigger garbage collection to flush the write-buffer. 5281da177e4SLinus Torvalds If ino arg is zero, do it if _any_ real (i.e. not GC) writes are 5291da177e4SLinus Torvalds outstanding. If ino arg non-zero, do it only if a write for the 5301da177e4SLinus Torvalds given inode is outstanding. */ 5311da177e4SLinus Torvalds int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino) 5321da177e4SLinus Torvalds { 5331da177e4SLinus Torvalds uint32_t old_wbuf_ofs; 5341da177e4SLinus Torvalds uint32_t old_wbuf_len; 5351da177e4SLinus Torvalds int ret = 0; 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino)); 5381da177e4SLinus Torvalds 5398aee6ac1SDavid Woodhouse if (!c->wbuf) 5408aee6ac1SDavid Woodhouse return 0; 5418aee6ac1SDavid Woodhouse 5421da177e4SLinus Torvalds down(&c->alloc_sem); 5431da177e4SLinus Torvalds if (!jffs2_wbuf_pending_for_ino(c, ino)) { 5441da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino)); 5451da177e4SLinus Torvalds up(&c->alloc_sem); 5461da177e4SLinus Torvalds return 0; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds old_wbuf_ofs = c->wbuf_ofs; 5501da177e4SLinus Torvalds old_wbuf_len = c->wbuf_len; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds if (c->unchecked_size) { 5531da177e4SLinus Torvalds /* GC won't make any progress for a while */ 5541da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n")); 5551da177e4SLinus Torvalds down_write(&c->wbuf_sem); 5561da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 5577f716cf3SEstelle Hammache /* retry flushing wbuf in case jffs2_wbuf_recover 5587f716cf3SEstelle Hammache left some data in the wbuf */ 5597f716cf3SEstelle Hammache if (ret) 5607f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 5611da177e4SLinus Torvalds up_write(&c->wbuf_sem); 5621da177e4SLinus Torvalds } else while (old_wbuf_len && 5631da177e4SLinus Torvalds old_wbuf_ofs == c->wbuf_ofs) { 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds up(&c->alloc_sem); 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n")); 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds ret = jffs2_garbage_collect_pass(c); 5701da177e4SLinus Torvalds if (ret) { 5711da177e4SLinus Torvalds /* GC failed. Flush it with padding instead */ 5721da177e4SLinus Torvalds down(&c->alloc_sem); 5731da177e4SLinus Torvalds down_write(&c->wbuf_sem); 5741da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 5757f716cf3SEstelle Hammache /* retry flushing wbuf in case jffs2_wbuf_recover 5767f716cf3SEstelle Hammache left some data in the wbuf */ 5777f716cf3SEstelle Hammache if (ret) 5787f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING); 5791da177e4SLinus Torvalds up_write(&c->wbuf_sem); 5801da177e4SLinus Torvalds break; 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds down(&c->alloc_sem); 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n")); 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds up(&c->alloc_sem); 5881da177e4SLinus Torvalds return ret; 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds /* Pad write-buffer to end and write it, wasting space. */ 5921da177e4SLinus Torvalds int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c) 5931da177e4SLinus Torvalds { 5941da177e4SLinus Torvalds int ret; 5951da177e4SLinus Torvalds 5968aee6ac1SDavid Woodhouse if (!c->wbuf) 5978aee6ac1SDavid Woodhouse return 0; 5988aee6ac1SDavid Woodhouse 5991da177e4SLinus Torvalds down_write(&c->wbuf_sem); 6001da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 6017f716cf3SEstelle Hammache /* retry - maybe wbuf recover left some data in wbuf. */ 6027f716cf3SEstelle Hammache if (ret) 6037f716cf3SEstelle Hammache ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 6041da177e4SLinus Torvalds up_write(&c->wbuf_sem); 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds return ret; 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds 6092f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 6108f15fd55SAndrew Victor #define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) ) 6118f15fd55SAndrew Victor #define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) ) 6128f15fd55SAndrew Victor #else 6131da177e4SLinus Torvalds #define PAGE_DIV(x) ( (x) & (~(c->wbuf_pagesize - 1)) ) 6141da177e4SLinus Torvalds #define PAGE_MOD(x) ( (x) & (c->wbuf_pagesize - 1) ) 6158f15fd55SAndrew Victor #endif 6168f15fd55SAndrew Victor 6171da177e4SLinus Torvalds int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsigned long count, loff_t to, size_t *retlen, uint32_t ino) 6181da177e4SLinus Torvalds { 6191da177e4SLinus Torvalds struct kvec outvecs[3]; 6201da177e4SLinus Torvalds uint32_t totlen = 0; 6211da177e4SLinus Torvalds uint32_t split_ofs = 0; 6221da177e4SLinus Torvalds uint32_t old_totlen; 6231da177e4SLinus Torvalds int ret, splitvec = -1; 6241da177e4SLinus Torvalds int invec, outvec; 6251da177e4SLinus Torvalds size_t wbuf_retlen; 6261da177e4SLinus Torvalds unsigned char *wbuf_ptr; 6271da177e4SLinus Torvalds size_t donelen = 0; 6281da177e4SLinus Torvalds uint32_t outvec_to = to; 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds /* If not NAND flash, don't bother */ 6313be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 6321da177e4SLinus Torvalds return jffs2_flash_direct_writev(c, invecs, count, to, retlen); 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds down_write(&c->wbuf_sem); 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds /* If wbuf_ofs is not initialized, set it to target address */ 6371da177e4SLinus Torvalds if (c->wbuf_ofs == 0xFFFFFFFF) { 6381da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(to); 6391da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 6401da177e4SLinus Torvalds memset(c->wbuf,0xff,c->wbuf_pagesize); 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* Fixup the wbuf if we are moving to a new eraseblock. The checks below 6441da177e4SLinus Torvalds fail for ECC'd NOR because cleanmarker == 16, so a block starts at 6451da177e4SLinus Torvalds xxx0010. */ 6461da177e4SLinus Torvalds if (jffs2_nor_ecc(c)) { 6471da177e4SLinus Torvalds if (((c->wbuf_ofs % c->sector_size) == 0) && !c->wbuf_len) { 6481da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(to); 6491da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 6501da177e4SLinus Torvalds memset(c->wbuf,0xff,c->wbuf_pagesize); 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds /* Sanity checks on target address. 6551da177e4SLinus Torvalds It's permitted to write at PAD(c->wbuf_len+c->wbuf_ofs), 6561da177e4SLinus Torvalds and it's permitted to write at the beginning of a new 6571da177e4SLinus Torvalds erase block. Anything else, and you die. 6581da177e4SLinus Torvalds New block starts at xxx000c (0-b = block header) 6591da177e4SLinus Torvalds */ 6603be36675SAndrew Victor if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) { 6611da177e4SLinus Torvalds /* It's a write to a new block */ 6621da177e4SLinus Torvalds if (c->wbuf_len) { 6631da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx causes flush of wbuf at 0x%08x\n", (unsigned long)to, c->wbuf_ofs)); 6641da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT); 6651da177e4SLinus Torvalds if (ret) { 6661da177e4SLinus Torvalds /* the underlying layer has to check wbuf_len to do the cleanup */ 6671da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret)); 6681da177e4SLinus Torvalds *retlen = 0; 6691da177e4SLinus Torvalds goto exit; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds /* set pointer to new block */ 6731da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(to); 6741da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds if (to != PAD(c->wbuf_ofs + c->wbuf_len)) { 6781da177e4SLinus Torvalds /* We're not writing immediately after the writebuffer. Bad. */ 6791da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write to %08lx\n", (unsigned long)to); 6801da177e4SLinus Torvalds if (c->wbuf_len) 6811da177e4SLinus Torvalds printk(KERN_CRIT "wbuf was previously %08x-%08x\n", 6821da177e4SLinus Torvalds c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len); 6831da177e4SLinus Torvalds BUG(); 6841da177e4SLinus Torvalds } 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds /* Note outvecs[3] above. We know count is never greater than 2 */ 6871da177e4SLinus Torvalds if (count > 2) { 6881da177e4SLinus Torvalds printk(KERN_CRIT "jffs2_flash_writev(): count is %ld\n", count); 6891da177e4SLinus Torvalds BUG(); 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds invec = 0; 6931da177e4SLinus Torvalds outvec = 0; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds /* Fill writebuffer first, if already in use */ 6961da177e4SLinus Torvalds if (c->wbuf_len) { 6971da177e4SLinus Torvalds uint32_t invec_ofs = 0; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds /* adjust alignment offset */ 7001da177e4SLinus Torvalds if (c->wbuf_len != PAGE_MOD(to)) { 7011da177e4SLinus Torvalds c->wbuf_len = PAGE_MOD(to); 7021da177e4SLinus Torvalds /* take care of alignment to next page */ 7031da177e4SLinus Torvalds if (!c->wbuf_len) 7041da177e4SLinus Torvalds c->wbuf_len = c->wbuf_pagesize; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds while(c->wbuf_len < c->wbuf_pagesize) { 7081da177e4SLinus Torvalds uint32_t thislen; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds if (invec == count) 7111da177e4SLinus Torvalds goto alldone; 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds thislen = c->wbuf_pagesize - c->wbuf_len; 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds if (thislen >= invecs[invec].iov_len) 7161da177e4SLinus Torvalds thislen = invecs[invec].iov_len; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds invec_ofs = thislen; 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds memcpy(c->wbuf + c->wbuf_len, invecs[invec].iov_base, thislen); 7211da177e4SLinus Torvalds c->wbuf_len += thislen; 7221da177e4SLinus Torvalds donelen += thislen; 7231da177e4SLinus Torvalds /* Get next invec, if actual did not fill the buffer */ 7241da177e4SLinus Torvalds if (c->wbuf_len < c->wbuf_pagesize) 7251da177e4SLinus Torvalds invec++; 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds /* write buffer is full, flush buffer */ 7291da177e4SLinus Torvalds ret = __jffs2_flush_wbuf(c, NOPAD); 7301da177e4SLinus Torvalds if (ret) { 7311da177e4SLinus Torvalds /* the underlying layer has to check wbuf_len to do the cleanup */ 7321da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret)); 7331da177e4SLinus Torvalds /* Retlen zero to make sure our caller doesn't mark the space dirty. 7341da177e4SLinus Torvalds We've already done everything that's necessary */ 7351da177e4SLinus Torvalds *retlen = 0; 7361da177e4SLinus Torvalds goto exit; 7371da177e4SLinus Torvalds } 7381da177e4SLinus Torvalds outvec_to += donelen; 7391da177e4SLinus Torvalds c->wbuf_ofs = outvec_to; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds /* All invecs done ? */ 7421da177e4SLinus Torvalds if (invec == count) 7431da177e4SLinus Torvalds goto alldone; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds /* Set up the first outvec, containing the remainder of the 7461da177e4SLinus Torvalds invec we partially used */ 7471da177e4SLinus Torvalds if (invecs[invec].iov_len > invec_ofs) { 7481da177e4SLinus Torvalds outvecs[0].iov_base = invecs[invec].iov_base+invec_ofs; 7491da177e4SLinus Torvalds totlen = outvecs[0].iov_len = invecs[invec].iov_len-invec_ofs; 7501da177e4SLinus Torvalds if (totlen > c->wbuf_pagesize) { 7511da177e4SLinus Torvalds splitvec = outvec; 7521da177e4SLinus Torvalds split_ofs = outvecs[0].iov_len - PAGE_MOD(totlen); 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds outvec++; 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds invec++; 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds /* OK, now we've flushed the wbuf and the start of the bits 7601da177e4SLinus Torvalds we have been asked to write, now to write the rest.... */ 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* totlen holds the amount of data still to be written */ 7631da177e4SLinus Torvalds old_totlen = totlen; 7641da177e4SLinus Torvalds for ( ; invec < count; invec++,outvec++ ) { 7651da177e4SLinus Torvalds outvecs[outvec].iov_base = invecs[invec].iov_base; 7661da177e4SLinus Torvalds totlen += outvecs[outvec].iov_len = invecs[invec].iov_len; 7671da177e4SLinus Torvalds if (PAGE_DIV(totlen) != PAGE_DIV(old_totlen)) { 7681da177e4SLinus Torvalds splitvec = outvec; 7691da177e4SLinus Torvalds split_ofs = outvecs[outvec].iov_len - PAGE_MOD(totlen); 7701da177e4SLinus Torvalds old_totlen = totlen; 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Now the outvecs array holds all the remaining data to write */ 7751da177e4SLinus Torvalds /* Up to splitvec,split_ofs is to be written immediately. The rest 7761da177e4SLinus Torvalds goes into the (now-empty) wbuf */ 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds if (splitvec != -1) { 7791da177e4SLinus Torvalds uint32_t remainder; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds remainder = outvecs[splitvec].iov_len - split_ofs; 7821da177e4SLinus Torvalds outvecs[splitvec].iov_len = split_ofs; 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* We did cross a page boundary, so we write some now */ 7851da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 7861da177e4SLinus Torvalds ret = c->mtd->writev_ecc(c->mtd, outvecs, splitvec+1, outvec_to, &wbuf_retlen, NULL, c->oobinfo); 7871da177e4SLinus Torvalds else 7881da177e4SLinus Torvalds ret = jffs2_flash_direct_writev(c, outvecs, splitvec+1, outvec_to, &wbuf_retlen); 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds if (ret < 0 || wbuf_retlen != PAGE_DIV(totlen)) { 7911da177e4SLinus Torvalds /* At this point we have no problem, 7927f716cf3SEstelle Hammache c->wbuf is empty. However refile nextblock to avoid 7937f716cf3SEstelle Hammache writing again to same address. 7941da177e4SLinus Torvalds */ 7957f716cf3SEstelle Hammache struct jffs2_eraseblock *jeb; 7967f716cf3SEstelle Hammache 7977f716cf3SEstelle Hammache spin_lock(&c->erase_completion_lock); 7987f716cf3SEstelle Hammache 7997f716cf3SEstelle Hammache jeb = &c->blocks[outvec_to / c->sector_size]; 8007f716cf3SEstelle Hammache jffs2_block_refile(c, jeb, REFILE_ANYWAY); 8017f716cf3SEstelle Hammache 8027f716cf3SEstelle Hammache *retlen = 0; 8037f716cf3SEstelle Hammache spin_unlock(&c->erase_completion_lock); 8041da177e4SLinus Torvalds goto exit; 8051da177e4SLinus Torvalds } 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds donelen += wbuf_retlen; 8081da177e4SLinus Torvalds c->wbuf_ofs = PAGE_DIV(outvec_to) + PAGE_DIV(totlen); 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds if (remainder) { 8111da177e4SLinus Torvalds outvecs[splitvec].iov_base += split_ofs; 8121da177e4SLinus Torvalds outvecs[splitvec].iov_len = remainder; 8131da177e4SLinus Torvalds } else { 8141da177e4SLinus Torvalds splitvec++; 8151da177e4SLinus Torvalds } 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds } else { 8181da177e4SLinus Torvalds splitvec = 0; 8191da177e4SLinus Torvalds } 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds /* Now splitvec points to the start of the bits we have to copy 8221da177e4SLinus Torvalds into the wbuf */ 8231da177e4SLinus Torvalds wbuf_ptr = c->wbuf; 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds for ( ; splitvec < outvec; splitvec++) { 8261da177e4SLinus Torvalds /* Don't copy the wbuf into itself */ 8271da177e4SLinus Torvalds if (outvecs[splitvec].iov_base == c->wbuf) 8281da177e4SLinus Torvalds continue; 8291da177e4SLinus Torvalds memcpy(wbuf_ptr, outvecs[splitvec].iov_base, outvecs[splitvec].iov_len); 8301da177e4SLinus Torvalds wbuf_ptr += outvecs[splitvec].iov_len; 8311da177e4SLinus Torvalds donelen += outvecs[splitvec].iov_len; 8321da177e4SLinus Torvalds } 8331da177e4SLinus Torvalds c->wbuf_len = wbuf_ptr - c->wbuf; 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds /* If there's a remainder in the wbuf and it's a non-GC write, 8361da177e4SLinus Torvalds remember that the wbuf affects this ino */ 8371da177e4SLinus Torvalds alldone: 8381da177e4SLinus Torvalds *retlen = donelen; 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds if (c->wbuf_len && ino) 8411da177e4SLinus Torvalds jffs2_wbuf_dirties_inode(c, ino); 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds ret = 0; 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds exit: 8461da177e4SLinus Torvalds up_write(&c->wbuf_sem); 8471da177e4SLinus Torvalds return ret; 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds /* 8511da177e4SLinus Torvalds * This is the entry for flash write. 8521da177e4SLinus Torvalds * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev 8531da177e4SLinus Torvalds */ 8541da177e4SLinus Torvalds int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, const u_char *buf) 8551da177e4SLinus Torvalds { 8561da177e4SLinus Torvalds struct kvec vecs[1]; 8571da177e4SLinus Torvalds 8583be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 8591da177e4SLinus Torvalds return c->mtd->write(c->mtd, ofs, len, retlen, buf); 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds vecs[0].iov_base = (unsigned char *) buf; 8621da177e4SLinus Torvalds vecs[0].iov_len = len; 8631da177e4SLinus Torvalds return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0); 8641da177e4SLinus Torvalds } 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds /* 8671da177e4SLinus Torvalds Handle readback from writebuffer and ECC failure return 8681da177e4SLinus Torvalds */ 8691da177e4SLinus Torvalds int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf) 8701da177e4SLinus Torvalds { 8711da177e4SLinus Torvalds loff_t orbf = 0, owbf = 0, lwbf = 0; 8721da177e4SLinus Torvalds int ret; 8731da177e4SLinus Torvalds 8743be36675SAndrew Victor if (!jffs2_is_writebuffered(c)) 8753be36675SAndrew Victor return c->mtd->read(c->mtd, ofs, len, retlen, buf); 8761da177e4SLinus Torvalds 8773be36675SAndrew Victor /* Read flash */ 878894214d1SArtem B. Bityuckiy down_read(&c->wbuf_sem); 8791da177e4SLinus Torvalds if (jffs2_cleanmarker_oob(c)) 8801da177e4SLinus Torvalds ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo); 8811da177e4SLinus Torvalds else 8821da177e4SLinus Torvalds ret = c->mtd->read(c->mtd, ofs, len, retlen, buf); 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds if ( (ret == -EBADMSG) && (*retlen == len) ) { 8851da177e4SLinus Torvalds printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n", 8861da177e4SLinus Torvalds len, ofs); 8871da177e4SLinus Torvalds /* 8881da177e4SLinus Torvalds * We have the raw data without ECC correction in the buffer, maybe 8891da177e4SLinus Torvalds * we are lucky and all data or parts are correct. We check the node. 8901da177e4SLinus Torvalds * If data are corrupted node check will sort it out. 8911da177e4SLinus Torvalds * We keep this block, it will fail on write or erase and the we 8921da177e4SLinus Torvalds * mark it bad. Or should we do that now? But we should give him a chance. 8931da177e4SLinus Torvalds * Maybe we had a system crash or power loss before the ecc write or 8941da177e4SLinus Torvalds * a erase was completed. 8951da177e4SLinus Torvalds * So we return success. :) 8961da177e4SLinus Torvalds */ 8971da177e4SLinus Torvalds ret = 0; 8981da177e4SLinus Torvalds } 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds /* if no writebuffer available or write buffer empty, return */ 9011da177e4SLinus Torvalds if (!c->wbuf_pagesize || !c->wbuf_len) 902894214d1SArtem B. Bityuckiy goto exit; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds /* if we read in a different block, return */ 9053be36675SAndrew Victor if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs)) 906894214d1SArtem B. Bityuckiy goto exit; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds if (ofs >= c->wbuf_ofs) { 9091da177e4SLinus Torvalds owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */ 9101da177e4SLinus Torvalds if (owbf > c->wbuf_len) /* is read beyond write buffer ? */ 9111da177e4SLinus Torvalds goto exit; 9121da177e4SLinus Torvalds lwbf = c->wbuf_len - owbf; /* number of bytes to copy */ 9131da177e4SLinus Torvalds if (lwbf > len) 9141da177e4SLinus Torvalds lwbf = len; 9151da177e4SLinus Torvalds } else { 9161da177e4SLinus Torvalds orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */ 9171da177e4SLinus Torvalds if (orbf > len) /* is write beyond write buffer ? */ 9181da177e4SLinus Torvalds goto exit; 9191da177e4SLinus Torvalds lwbf = len - orbf; /* number of bytes to copy */ 9201da177e4SLinus Torvalds if (lwbf > c->wbuf_len) 9211da177e4SLinus Torvalds lwbf = c->wbuf_len; 9221da177e4SLinus Torvalds } 9231da177e4SLinus Torvalds if (lwbf > 0) 9241da177e4SLinus Torvalds memcpy(buf+orbf,c->wbuf+owbf,lwbf); 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds exit: 9271da177e4SLinus Torvalds up_read(&c->wbuf_sem); 9281da177e4SLinus Torvalds return ret; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds /* 9321da177e4SLinus Torvalds * Check, if the out of band area is empty 9331da177e4SLinus Torvalds */ 9341da177e4SLinus Torvalds int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int mode) 9351da177e4SLinus Torvalds { 9361da177e4SLinus Torvalds unsigned char *buf; 9371da177e4SLinus Torvalds int ret = 0; 9381da177e4SLinus Torvalds int i,len,page; 9391da177e4SLinus Torvalds size_t retlen; 9401da177e4SLinus Torvalds int oob_size; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds /* allocate a buffer for all oob data in this sector */ 9431da177e4SLinus Torvalds oob_size = c->mtd->oobsize; 9441da177e4SLinus Torvalds len = 4 * oob_size; 9451da177e4SLinus Torvalds buf = kmalloc(len, GFP_KERNEL); 9461da177e4SLinus Torvalds if (!buf) { 9471da177e4SLinus Torvalds printk(KERN_NOTICE "jffs2_check_oob_empty(): allocation of temporary data buffer for oob check failed\n"); 9481da177e4SLinus Torvalds return -ENOMEM; 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds /* 9511da177e4SLinus Torvalds * if mode = 0, we scan for a total empty oob area, else we have 9521da177e4SLinus Torvalds * to take care of the cleanmarker in the first page of the block 9531da177e4SLinus Torvalds */ 9541da177e4SLinus Torvalds ret = jffs2_flash_read_oob(c, jeb->offset, len , &retlen, buf); 9551da177e4SLinus Torvalds if (ret) { 9561da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB failed %d for block at %08x\n", ret, jeb->offset)); 9571da177e4SLinus Torvalds goto out; 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds if (retlen < len) { 9611da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB return short read " 9621da177e4SLinus Torvalds "(%zd bytes not %d) for block at %08x\n", retlen, len, jeb->offset)); 9631da177e4SLinus Torvalds ret = -EIO; 9641da177e4SLinus Torvalds goto out; 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds /* Special check for first page */ 9681da177e4SLinus Torvalds for(i = 0; i < oob_size ; i++) { 9691da177e4SLinus Torvalds /* Yeah, we know about the cleanmarker. */ 9701da177e4SLinus Torvalds if (mode && i >= c->fsdata_pos && 9711da177e4SLinus Torvalds i < c->fsdata_pos + c->fsdata_len) 9721da177e4SLinus Torvalds continue; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds if (buf[i] != 0xFF) { 9751da177e4SLinus Torvalds D2(printk(KERN_DEBUG "Found %02x at %x in OOB for %08x\n", 9761da177e4SLinus Torvalds buf[page+i], page+i, jeb->offset)); 9771da177e4SLinus Torvalds ret = 1; 9781da177e4SLinus Torvalds goto out; 9791da177e4SLinus Torvalds } 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds /* we know, we are aligned :) */ 9831da177e4SLinus Torvalds for (page = oob_size; page < len; page += sizeof(long)) { 9841da177e4SLinus Torvalds unsigned long dat = *(unsigned long *)(&buf[page]); 9851da177e4SLinus Torvalds if(dat != -1) { 9861da177e4SLinus Torvalds ret = 1; 9871da177e4SLinus Torvalds goto out; 9881da177e4SLinus Torvalds } 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds out: 9921da177e4SLinus Torvalds kfree(buf); 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds return ret; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds /* 9981da177e4SLinus Torvalds * Scan for a valid cleanmarker and for bad blocks 9991da177e4SLinus Torvalds * For virtual blocks (concatenated physical blocks) check the cleanmarker 10001da177e4SLinus Torvalds * only in the first page of the first physical block, but scan for bad blocks in all 10011da177e4SLinus Torvalds * physical blocks 10021da177e4SLinus Torvalds */ 10031da177e4SLinus Torvalds int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 10041da177e4SLinus Torvalds { 10051da177e4SLinus Torvalds struct jffs2_unknown_node n; 10061da177e4SLinus Torvalds unsigned char buf[2 * NAND_MAX_OOBSIZE]; 10071da177e4SLinus Torvalds unsigned char *p; 10081da177e4SLinus Torvalds int ret, i, cnt, retval = 0; 10091da177e4SLinus Torvalds size_t retlen, offset; 10101da177e4SLinus Torvalds int oob_size; 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds offset = jeb->offset; 10131da177e4SLinus Torvalds oob_size = c->mtd->oobsize; 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds /* Loop through the physical blocks */ 10161da177e4SLinus Torvalds for (cnt = 0; cnt < (c->sector_size / c->mtd->erasesize); cnt++) { 10171da177e4SLinus Torvalds /* Check first if the block is bad. */ 10181da177e4SLinus Torvalds if (c->mtd->block_isbad (c->mtd, offset)) { 10191da177e4SLinus Torvalds D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Bad block at %08x\n", jeb->offset)); 10201da177e4SLinus Torvalds return 2; 10211da177e4SLinus Torvalds } 10221da177e4SLinus Torvalds /* 10231da177e4SLinus Torvalds * We read oob data from page 0 and 1 of the block. 10241da177e4SLinus Torvalds * page 0 contains cleanmarker and badblock info 10251da177e4SLinus Torvalds * page 1 contains failure count of this block 10261da177e4SLinus Torvalds */ 10271da177e4SLinus Torvalds ret = c->mtd->read_oob (c->mtd, offset, oob_size << 1, &retlen, buf); 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds if (ret) { 10301da177e4SLinus Torvalds D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB failed %d for block at %08x\n", ret, jeb->offset)); 10311da177e4SLinus Torvalds return ret; 10321da177e4SLinus Torvalds } 10331da177e4SLinus Torvalds if (retlen < (oob_size << 1)) { 10341da177e4SLinus 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)); 10351da177e4SLinus Torvalds return -EIO; 10361da177e4SLinus Torvalds } 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds /* Check cleanmarker only on the first physical block */ 10391da177e4SLinus Torvalds if (!cnt) { 10401da177e4SLinus Torvalds n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK); 10411da177e4SLinus Torvalds n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER); 10421da177e4SLinus Torvalds n.totlen = cpu_to_je32 (8); 10431da177e4SLinus Torvalds p = (unsigned char *) &n; 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds for (i = 0; i < c->fsdata_len; i++) { 10461da177e4SLinus Torvalds if (buf[c->fsdata_pos + i] != p[i]) { 10471da177e4SLinus Torvalds retval = 1; 10481da177e4SLinus Torvalds } 10491da177e4SLinus Torvalds } 10501da177e4SLinus Torvalds D1(if (retval == 1) { 10511da177e4SLinus Torvalds printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): Cleanmarker node not detected in block at %08x\n", jeb->offset); 10521da177e4SLinus Torvalds printk(KERN_WARNING "OOB at %08x was ", offset); 10531da177e4SLinus Torvalds for (i=0; i < oob_size; i++) { 10541da177e4SLinus Torvalds printk("%02x ", buf[i]); 10551da177e4SLinus Torvalds } 10561da177e4SLinus Torvalds printk("\n"); 10571da177e4SLinus Torvalds }) 10581da177e4SLinus Torvalds } 10591da177e4SLinus Torvalds offset += c->mtd->erasesize; 10601da177e4SLinus Torvalds } 10611da177e4SLinus Torvalds return retval; 10621da177e4SLinus Torvalds } 10631da177e4SLinus Torvalds 10641da177e4SLinus Torvalds int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 10651da177e4SLinus Torvalds { 10661da177e4SLinus Torvalds struct jffs2_unknown_node n; 10671da177e4SLinus Torvalds int ret; 10681da177e4SLinus Torvalds size_t retlen; 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 10711da177e4SLinus Torvalds n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER); 10721da177e4SLinus Torvalds n.totlen = cpu_to_je32(8); 10731da177e4SLinus Torvalds 10741da177e4SLinus Torvalds ret = jffs2_flash_write_oob(c, jeb->offset + c->fsdata_pos, c->fsdata_len, &retlen, (unsigned char *)&n); 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds if (ret) { 10771da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); 10781da177e4SLinus Torvalds return ret; 10791da177e4SLinus Torvalds } 10801da177e4SLinus Torvalds if (retlen != c->fsdata_len) { 10811da177e4SLinus 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)); 10821da177e4SLinus Torvalds return ret; 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds return 0; 10851da177e4SLinus Torvalds } 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds /* 10881da177e4SLinus Torvalds * On NAND we try to mark this block bad. If the block was erased more 10891da177e4SLinus Torvalds * than MAX_ERASE_FAILURES we mark it finaly bad. 10901da177e4SLinus Torvalds * Don't care about failures. This block remains on the erase-pending 10911da177e4SLinus Torvalds * or badblock list as long as nobody manipulates the flash with 10921da177e4SLinus Torvalds * a bootloader or something like that. 10931da177e4SLinus Torvalds */ 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset) 10961da177e4SLinus Torvalds { 10971da177e4SLinus Torvalds int ret; 10981da177e4SLinus Torvalds 10991da177e4SLinus Torvalds /* if the count is < max, we try to write the counter to the 2nd page oob area */ 11001da177e4SLinus Torvalds if( ++jeb->bad_count < MAX_ERASE_FAILURES) 11011da177e4SLinus Torvalds return 0; 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds if (!c->mtd->block_markbad) 11041da177e4SLinus Torvalds return 1; // What else can we do? 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset)); 11071da177e4SLinus Torvalds ret = c->mtd->block_markbad(c->mtd, bad_offset); 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds if (ret) { 11101da177e4SLinus Torvalds D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret)); 11111da177e4SLinus Torvalds return ret; 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds return 1; 11141da177e4SLinus Torvalds } 11151da177e4SLinus Torvalds 11161da177e4SLinus Torvalds #define NAND_JFFS2_OOB16_FSDALEN 8 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds static struct nand_oobinfo jffs2_oobinfo_docecc = { 11191da177e4SLinus Torvalds .useecc = MTD_NANDECC_PLACE, 11201da177e4SLinus Torvalds .eccbytes = 6, 11211da177e4SLinus Torvalds .eccpos = {0,1,2,3,4,5} 11221da177e4SLinus Torvalds }; 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c) 11261da177e4SLinus Torvalds { 11271da177e4SLinus Torvalds struct nand_oobinfo *oinfo = &c->mtd->oobinfo; 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds /* Do this only, if we have an oob buffer */ 11301da177e4SLinus Torvalds if (!c->mtd->oobsize) 11311da177e4SLinus Torvalds return 0; 11321da177e4SLinus Torvalds 11331da177e4SLinus Torvalds /* Cleanmarker is out-of-band, so inline size zero */ 11341da177e4SLinus Torvalds c->cleanmarker_size = 0; 11351da177e4SLinus Torvalds 11361da177e4SLinus Torvalds /* Should we use autoplacement ? */ 11371da177e4SLinus Torvalds if (oinfo && oinfo->useecc == MTD_NANDECC_AUTOPLACE) { 11381da177e4SLinus Torvalds D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n")); 11391da177e4SLinus Torvalds /* Get the position of the free bytes */ 11401da177e4SLinus Torvalds if (!oinfo->oobfree[0][1]) { 11411da177e4SLinus Torvalds printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep. Autoplacement selected and no empty space in oob\n"); 11421da177e4SLinus Torvalds return -ENOSPC; 11431da177e4SLinus Torvalds } 11441da177e4SLinus Torvalds c->fsdata_pos = oinfo->oobfree[0][0]; 11451da177e4SLinus Torvalds c->fsdata_len = oinfo->oobfree[0][1]; 11461da177e4SLinus Torvalds if (c->fsdata_len > 8) 11471da177e4SLinus Torvalds c->fsdata_len = 8; 11481da177e4SLinus Torvalds } else { 11491da177e4SLinus Torvalds /* This is just a legacy fallback and should go away soon */ 11501da177e4SLinus Torvalds switch(c->mtd->ecctype) { 11511da177e4SLinus Torvalds case MTD_ECC_RS_DiskOnChip: 11521da177e4SLinus Torvalds printk(KERN_WARNING "JFFS2 using DiskOnChip hardware ECC without autoplacement. Fix it!\n"); 11531da177e4SLinus Torvalds c->oobinfo = &jffs2_oobinfo_docecc; 11541da177e4SLinus Torvalds c->fsdata_pos = 6; 11551da177e4SLinus Torvalds c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN; 11561da177e4SLinus Torvalds c->badblock_pos = 15; 11571da177e4SLinus Torvalds break; 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds default: 11601da177e4SLinus Torvalds D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n")); 11611da177e4SLinus Torvalds return -EINVAL; 11621da177e4SLinus Torvalds } 11631da177e4SLinus Torvalds } 11641da177e4SLinus Torvalds return 0; 11651da177e4SLinus Torvalds } 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds int jffs2_nand_flash_setup(struct jffs2_sb_info *c) 11681da177e4SLinus Torvalds { 11691da177e4SLinus Torvalds int res; 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds /* Initialise write buffer */ 11721da177e4SLinus Torvalds init_rwsem(&c->wbuf_sem); 11731da177e4SLinus Torvalds c->wbuf_pagesize = c->mtd->oobblock; 11741da177e4SLinus Torvalds c->wbuf_ofs = 0xFFFFFFFF; 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 11771da177e4SLinus Torvalds if (!c->wbuf) 11781da177e4SLinus Torvalds return -ENOMEM; 11791da177e4SLinus Torvalds 11801da177e4SLinus Torvalds res = jffs2_nand_set_oobinfo(c); 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds #ifdef BREAKME 11831da177e4SLinus Torvalds if (!brokenbuf) 11841da177e4SLinus Torvalds brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 11851da177e4SLinus Torvalds if (!brokenbuf) { 11861da177e4SLinus Torvalds kfree(c->wbuf); 11871da177e4SLinus Torvalds return -ENOMEM; 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds memset(brokenbuf, 0xdb, c->wbuf_pagesize); 11901da177e4SLinus Torvalds #endif 11911da177e4SLinus Torvalds return res; 11921da177e4SLinus Torvalds } 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c) 11951da177e4SLinus Torvalds { 11961da177e4SLinus Torvalds kfree(c->wbuf); 11971da177e4SLinus Torvalds } 11981da177e4SLinus Torvalds 11998f15fd55SAndrew Victor int jffs2_dataflash_setup(struct jffs2_sb_info *c) { 12008f15fd55SAndrew Victor c->cleanmarker_size = 0; /* No cleanmarkers needed */ 12018f15fd55SAndrew Victor 12028f15fd55SAndrew Victor /* Initialize write buffer */ 12038f15fd55SAndrew Victor init_rwsem(&c->wbuf_sem); 12048f15fd55SAndrew Victor c->wbuf_pagesize = c->sector_size; 12058f15fd55SAndrew Victor c->wbuf_ofs = 0xFFFFFFFF; 12068f15fd55SAndrew Victor 12078f15fd55SAndrew Victor c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 12088f15fd55SAndrew Victor if (!c->wbuf) 12098f15fd55SAndrew Victor return -ENOMEM; 12108f15fd55SAndrew Victor 12118f15fd55SAndrew Victor printk(KERN_INFO "JFFS2 write-buffering enabled (%i)\n", c->wbuf_pagesize); 12128f15fd55SAndrew Victor 12138f15fd55SAndrew Victor return 0; 12148f15fd55SAndrew Victor } 12158f15fd55SAndrew Victor 12168f15fd55SAndrew Victor void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) { 12178f15fd55SAndrew Victor kfree(c->wbuf); 12188f15fd55SAndrew Victor } 12198f15fd55SAndrew Victor 12201da177e4SLinus Torvalds int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) { 12211da177e4SLinus Torvalds /* Cleanmarker is actually larger on the flashes */ 12221da177e4SLinus Torvalds c->cleanmarker_size = 16; 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds /* Initialize write buffer */ 12251da177e4SLinus Torvalds init_rwsem(&c->wbuf_sem); 12261da177e4SLinus Torvalds c->wbuf_pagesize = c->mtd->eccsize; 12271da177e4SLinus Torvalds c->wbuf_ofs = 0xFFFFFFFF; 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); 12301da177e4SLinus Torvalds if (!c->wbuf) 12311da177e4SLinus Torvalds return -ENOMEM; 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds return 0; 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c) { 12371da177e4SLinus Torvalds kfree(c->wbuf); 12381da177e4SLinus Torvalds } 1239