2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2001-2003 Red Hat, Inc.
5 * Copyright (C) 2004 Thomas Gleixner <tglx@linutronix.de>
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 * Modified debugged and enhanced by Thomas Gleixner <tglx@linutronix.de>
10 * For licensing information, see the file 'LICENCE' in this directory.
12 * $Id: wbuf.c,v 1.100 2005/09/30 13:59:13 dedekind Exp $
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/crc32.h>
20 #include <linux/mtd/nand.h>
21 #include <linux/jiffies.h>
25 /* For testing write failures */
30 static unsigned char *brokenbuf;
33 #define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
34 #define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
36 /* max. erase failures before we mark a block bad */
37 #define MAX_ERASE_FAILURES 2
39 struct jffs2_inodirty {
41 struct jffs2_inodirty *next;
44 static struct jffs2_inodirty inodirty_nomem;
46 static int jffs2_wbuf_pending_for_ino(struct jffs2_sb_info *c, uint32_t ino)
48 struct jffs2_inodirty *this = c->wbuf_inodes;
50 /* If a malloc failed, consider _everything_ dirty */
51 if (this == &inodirty_nomem)
54 /* If ino == 0, _any_ non-GC writes mean 'yes' */
58 /* Look to see if the inode in question is pending in the wbuf */
67 static void jffs2_clear_wbuf_ino_list(struct jffs2_sb_info *c)
69 struct jffs2_inodirty *this;
71 this = c->wbuf_inodes;
73 if (this != &inodirty_nomem) {
75 struct jffs2_inodirty *next = this->next;
80 c->wbuf_inodes = NULL;
83 static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino)
85 struct jffs2_inodirty *new;
87 /* Mark the superblock dirty so that kupdated will flush... */
88 jffs2_erase_pending_trigger(c);
90 if (jffs2_wbuf_pending_for_ino(c, ino))
93 new = kmalloc(sizeof(*new), GFP_KERNEL);
95 D1(printk(KERN_DEBUG "No memory to allocate inodirty. Fallback to all considered dirty\n"));
96 jffs2_clear_wbuf_ino_list(c);
97 c->wbuf_inodes = &inodirty_nomem;
101 new->next = c->wbuf_inodes;
102 c->wbuf_inodes = new;
106 static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c)
108 struct list_head *this, *next;
111 if (list_empty(&c->erasable_pending_wbuf_list))
114 list_for_each_safe(this, next, &c->erasable_pending_wbuf_list) {
115 struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
117 D1(printk(KERN_DEBUG "Removing eraseblock at 0x%08x from erasable_pending_wbuf_list...\n", jeb->offset));
119 if ((jiffies + (n++)) & 127) {
120 /* Most of the time, we just erase it immediately. Otherwise we
121 spend ages scanning it on mount, etc. */
122 D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n"));
123 list_add_tail(&jeb->list, &c->erase_pending_list);
124 c->nr_erasing_blocks++;
125 jffs2_erase_pending_trigger(c);
127 /* Sometimes, however, we leave it elsewhere so it doesn't get
128 immediately reused, and we spread the load a bit. */
129 D1(printk(KERN_DEBUG "...and adding to erasable_list\n"));
130 list_add_tail(&jeb->list, &c->erasable_list);
135 #define REFILE_NOTEMPTY 0
136 #define REFILE_ANYWAY 1
138 static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int allow_empty)
140 D1(printk("About to refile bad block at %08x\n", jeb->offset));
142 /* File the existing block on the bad_used_list.... */
143 if (c->nextblock == jeb)
145 else /* Not sure this should ever happen... need more coffee */
146 list_del(&jeb->list);
147 if (jeb->first_node) {
148 D1(printk("Refiling block at %08x to bad_used_list\n", jeb->offset));
149 list_add(&jeb->list, &c->bad_used_list);
151 BUG_ON(allow_empty == REFILE_NOTEMPTY);
152 /* It has to have had some nodes or we couldn't be here */
153 D1(printk("Refiling block at %08x to erase_pending_list\n", jeb->offset));
154 list_add(&jeb->list, &c->erase_pending_list);
155 c->nr_erasing_blocks++;
156 jffs2_erase_pending_trigger(c);
159 /* Adjust its size counts accordingly */
160 c->wasted_size += jeb->free_size;
161 c->free_size -= jeb->free_size;
162 jeb->wasted_size += jeb->free_size;
165 jffs2_dbg_dump_block_lists_nolock(c);
166 jffs2_dbg_acct_sanity_check_nolock(c,jeb);
167 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
170 /* Recover from failure to write wbuf. Recover the nodes up to the
171 * wbuf, not the one which we were starting to try to write. */
173 static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
175 struct jffs2_eraseblock *jeb, *new_jeb;
176 struct jffs2_raw_node_ref **first_raw, **raw;
180 uint32_t start, end, ofs, len;
182 spin_lock(&c->erase_completion_lock);
184 jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
186 jffs2_block_refile(c, jeb, REFILE_NOTEMPTY);
188 /* Find the first node to be recovered, by skipping over every
189 node which ends before the wbuf starts, or which is obsolete. */
190 first_raw = &jeb->first_node;
192 (ref_obsolete(*first_raw) ||
193 (ref_offset(*first_raw)+ref_totlen(c, jeb, *first_raw)) < c->wbuf_ofs)) {
194 D1(printk(KERN_DEBUG "Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n",
195 ref_offset(*first_raw), ref_flags(*first_raw),
196 (ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw)),
198 first_raw = &(*first_raw)->next_phys;
202 /* All nodes were obsolete. Nothing to recover. */
203 D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n"));
204 spin_unlock(&c->erase_completion_lock);
208 start = ref_offset(*first_raw);
209 end = ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw);
211 /* Find the last node to be recovered */
214 if (!ref_obsolete(*raw))
215 end = ref_offset(*raw) + ref_totlen(c, jeb, *raw);
217 raw = &(*raw)->next_phys;
219 spin_unlock(&c->erase_completion_lock);
221 D1(printk(KERN_DEBUG "wbuf recover %08x-%08x\n", start, end));
224 if (start < c->wbuf_ofs) {
225 /* First affected node was already partially written.
226 * Attempt to reread the old data into our buffer. */
228 buf = kmalloc(end - start, GFP_KERNEL);
230 printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n");
236 if (jffs2_cleanmarker_oob(c))
237 ret = c->mtd->read_ecc(c->mtd, start, c->wbuf_ofs - start, &retlen, buf, NULL, c->oobinfo);
239 ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf);
241 if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) {
245 if (ret || retlen != c->wbuf_ofs - start) {
246 printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n");
251 first_raw = &(*first_raw)->next_phys;
252 /* If this was the only node to be recovered, give up */
256 /* It wasn't. Go on and try to recover nodes complete in the wbuf */
257 start = ref_offset(*first_raw);
259 /* Read succeeded. Copy the remaining data from the wbuf */
260 memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs);
263 /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards.
264 Either 'buf' contains the data, or we find it in the wbuf */
267 /* ... and get an allocation of space from a shiny new block instead */
268 ret = jffs2_reserve_space_gc(c, end-start, &len, JFFS2_SUMMARY_NOSUM_SIZE);
270 printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n");
276 if (end-start >= c->wbuf_pagesize) {
277 /* Need to do another write immediately, but it's possible
278 that this is just because the wbuf itself is completely
279 full, and there's nothing earlier read back from the
280 flash. Hence 'buf' isn't necessarily what we're writing
282 unsigned char *rewrite_buf = buf?:c->wbuf;
283 uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize);
285 D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n",
290 if (breakme++ == 20) {
291 printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs);
293 c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen,
294 brokenbuf, NULL, c->oobinfo);
298 if (jffs2_cleanmarker_oob(c))
299 ret = c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen,
300 rewrite_buf, NULL, c->oobinfo);
302 ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, rewrite_buf);
304 if (ret || retlen != towrite) {
305 /* Argh. We tried. Really we did. */
306 printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n");
310 struct jffs2_raw_node_ref *raw2;
312 raw2 = jffs2_alloc_raw_node_ref();
316 raw2->flash_offset = ofs | REF_OBSOLETE;
318 jffs2_add_physical_node_ref(c, raw2, ref_totlen(c, jeb, *first_raw), NULL);
322 printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs);
324 c->wbuf_len = (end - start) - towrite;
325 c->wbuf_ofs = ofs + towrite;
326 memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len);
327 /* Don't muck about with c->wbuf_inodes. False positives are harmless. */
330 /* OK, now we're left with the dregs in whichever buffer we're using */
332 memcpy(c->wbuf, buf, end-start);
335 memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start);
338 c->wbuf_len = end - start;
341 /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */
342 new_jeb = &c->blocks[ofs / c->sector_size];
344 spin_lock(&c->erase_completion_lock);
345 if (new_jeb->first_node) {
346 /* Odd, but possible with ST flash later maybe */
347 new_jeb->last_node->next_phys = *first_raw;
349 new_jeb->first_node = *first_raw;
354 uint32_t rawlen = ref_totlen(c, jeb, *raw);
356 D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n",
357 rawlen, ref_offset(*raw), ref_flags(*raw), ofs));
359 if (ref_obsolete(*raw)) {
360 /* Shouldn't really happen much */
361 new_jeb->dirty_size += rawlen;
362 new_jeb->free_size -= rawlen;
363 c->dirty_size += rawlen;
365 new_jeb->used_size += rawlen;
366 new_jeb->free_size -= rawlen;
367 jeb->dirty_size += rawlen;
368 jeb->used_size -= rawlen;
369 c->dirty_size += rawlen;
371 c->free_size -= rawlen;
372 (*raw)->flash_offset = ofs | ref_flags(*raw);
374 new_jeb->last_node = *raw;
376 raw = &(*raw)->next_phys;
379 /* Fix up the original jeb now it's on the bad_list */
381 if (first_raw == &jeb->first_node) {
382 jeb->last_node = NULL;
383 D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset));
384 list_del(&jeb->list);
385 list_add(&jeb->list, &c->erase_pending_list);
386 c->nr_erasing_blocks++;
387 jffs2_erase_pending_trigger(c);
390 jeb->last_node = container_of(first_raw, struct jffs2_raw_node_ref, next_phys);
392 jffs2_dbg_acct_sanity_check_nolock(c, jeb);
393 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
395 jffs2_dbg_acct_sanity_check_nolock(c, new_jeb);
396 jffs2_dbg_acct_paranoia_check_nolock(c, new_jeb);
398 spin_unlock(&c->erase_completion_lock);
400 D1(printk(KERN_DEBUG "wbuf recovery completed OK\n"));
403 /* Meaning of pad argument:
404 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway.
405 1: Pad, do not adjust nextblock free_size
406 2: Pad, adjust nextblock free_size
409 #define PAD_NOACCOUNT 1
410 #define PAD_ACCOUNTING 2
412 static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
417 /* Nothing to do if not write-buffering the flash. In particular, we shouldn't
418 del_timer() the timer we never initialised. */
419 if (!jffs2_is_writebuffered(c))
422 if (!down_trylock(&c->alloc_sem)) {
424 printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n");
428 if (!c->wbuf_len) /* already checked c->wbuf above */
431 /* claim remaining space on the page
432 this happens, if we have a change to a new block,
433 or if fsync forces us to flush the writebuffer.
434 if we have a switch to next page, we will not have
435 enough remaining space for this.
438 c->wbuf_len = PAD(c->wbuf_len);
440 /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR
441 with 8 byte page size */
442 memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len);
444 if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) {
445 struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len);
446 padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
447 padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING);
448 padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len);
449 padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4));
452 /* else jffs2_flash_writev has actually filled in the rest of the
453 buffer for us, and will deal with the node refs etc. later. */
457 if (breakme++ == 20) {
458 printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs);
460 c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize,
461 &retlen, brokenbuf, NULL, c->oobinfo);
466 if (jffs2_cleanmarker_oob(c))
467 ret = c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf, NULL, c->oobinfo);
469 ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf);
471 if (ret || retlen != c->wbuf_pagesize) {
473 printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret);
475 printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n",
476 retlen, c->wbuf_pagesize);
480 jffs2_wbuf_recover(c);
485 /* Adjust free size of the block if we padded. */
487 struct jffs2_eraseblock *jeb;
488 struct jffs2_raw_node_ref *ref;
489 uint32_t waste = c->wbuf_pagesize - c->wbuf_len;
491 jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
493 D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n",
494 (jeb==c->nextblock)?"next":"", jeb->offset));
496 /* wbuf_pagesize - wbuf_len is the amount of space that's to be
497 padded. If there is less free space in the block than that,
498 something screwed up */
499 if (jeb->free_size < waste) {
500 printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n",
501 c->wbuf_ofs, c->wbuf_len, waste);
502 printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n",
503 jeb->offset, jeb->free_size);
506 ref = jffs2_alloc_raw_node_ref();
509 ref->flash_offset = c->wbuf_ofs + c->wbuf_len;
510 ref->flash_offset |= REF_OBSOLETE;
512 spin_lock(&c->erase_completion_lock);
514 jffs2_link_node_ref(c, jeb, ref, waste, NULL);
515 /* FIXME: that made it count as dirty. Convert to wasted */
516 jeb->dirty_size -= waste;
517 c->dirty_size -= waste;
518 jeb->wasted_size += waste;
519 c->wasted_size += waste;
521 spin_lock(&c->erase_completion_lock);
523 /* Stick any now-obsoleted blocks on the erase_pending_list */
524 jffs2_refile_wbuf_blocks(c);
525 jffs2_clear_wbuf_ino_list(c);
526 spin_unlock(&c->erase_completion_lock);
528 memset(c->wbuf,0xff,c->wbuf_pagesize);
529 /* adjust write buffer offset, else we get a non contiguous write bug */
530 c->wbuf_ofs += c->wbuf_pagesize;
535 /* Trigger garbage collection to flush the write-buffer.
536 If ino arg is zero, do it if _any_ real (i.e. not GC) writes are
537 outstanding. If ino arg non-zero, do it only if a write for the
538 given inode is outstanding. */
539 int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino)
541 uint32_t old_wbuf_ofs;
542 uint32_t old_wbuf_len;
545 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino));
551 if (!jffs2_wbuf_pending_for_ino(c, ino)) {
552 D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino));
557 old_wbuf_ofs = c->wbuf_ofs;
558 old_wbuf_len = c->wbuf_len;
560 if (c->unchecked_size) {
561 /* GC won't make any progress for a while */
562 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n"));
563 down_write(&c->wbuf_sem);
564 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
565 /* retry flushing wbuf in case jffs2_wbuf_recover
566 left some data in the wbuf */
568 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
569 up_write(&c->wbuf_sem);
570 } else while (old_wbuf_len &&
571 old_wbuf_ofs == c->wbuf_ofs) {
575 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n"));
577 ret = jffs2_garbage_collect_pass(c);
579 /* GC failed. Flush it with padding instead */
581 down_write(&c->wbuf_sem);
582 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
583 /* retry flushing wbuf in case jffs2_wbuf_recover
584 left some data in the wbuf */
586 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
587 up_write(&c->wbuf_sem);
593 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n"));
599 /* Pad write-buffer to end and write it, wasting space. */
600 int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
607 down_write(&c->wbuf_sem);
608 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
609 /* retry - maybe wbuf recover left some data in wbuf. */
611 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
612 up_write(&c->wbuf_sem);
617 static size_t jffs2_fill_wbuf(struct jffs2_sb_info *c, const uint8_t *buf,
620 if (len && !c->wbuf_len && (len >= c->wbuf_pagesize))
623 if (len > (c->wbuf_pagesize - c->wbuf_len))
624 len = c->wbuf_pagesize - c->wbuf_len;
625 memcpy(c->wbuf + c->wbuf_len, buf, len);
626 c->wbuf_len += (uint32_t) len;
630 int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs,
631 unsigned long count, loff_t to, size_t *retlen,
634 struct jffs2_eraseblock *jeb;
635 size_t wbuf_retlen, donelen = 0;
636 uint32_t outvec_to = to;
639 /* If not writebuffered flash, don't bother */
640 if (!jffs2_is_writebuffered(c))
641 return jffs2_flash_direct_writev(c, invecs, count, to, retlen);
643 down_write(&c->wbuf_sem);
645 /* If wbuf_ofs is not initialized, set it to target address */
646 if (c->wbuf_ofs == 0xFFFFFFFF) {
647 c->wbuf_ofs = PAGE_DIV(to);
648 c->wbuf_len = PAGE_MOD(to);
649 memset(c->wbuf,0xff,c->wbuf_pagesize);
653 * Sanity checks on target address. It's permitted to write
654 * at PAD(c->wbuf_len+c->wbuf_ofs), and it's permitted to
655 * write at the beginning of a new erase block. Anything else,
656 * and you die. New block starts at xxx000c (0-b = block
659 if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) {
660 /* It's a write to a new block */
662 D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx "
663 "causes flush of wbuf at 0x%08x\n",
664 (unsigned long)to, c->wbuf_ofs));
665 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
669 /* set pointer to new block */
670 c->wbuf_ofs = PAGE_DIV(to);
671 c->wbuf_len = PAGE_MOD(to);
674 if (to != PAD(c->wbuf_ofs + c->wbuf_len)) {
675 /* We're not writing immediately after the writebuffer. Bad. */
676 printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write "
677 "to %08lx\n", (unsigned long)to);
679 printk(KERN_CRIT "wbuf was previously %08x-%08x\n",
680 c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len);
684 /* adjust alignment offset */
685 if (c->wbuf_len != PAGE_MOD(to)) {
686 c->wbuf_len = PAGE_MOD(to);
687 /* take care of alignment to next page */
689 c->wbuf_len = c->wbuf_pagesize;
690 ret = __jffs2_flush_wbuf(c, NOPAD);
696 for (invec = 0; invec < count; invec++) {
697 int vlen = invecs[invec].iov_len;
698 uint8_t *v = invecs[invec].iov_base;
700 wbuf_retlen = jffs2_fill_wbuf(c, v, vlen);
702 if (c->wbuf_len == c->wbuf_pagesize) {
703 ret = __jffs2_flush_wbuf(c, NOPAD);
708 outvec_to += wbuf_retlen;
709 donelen += wbuf_retlen;
712 if (vlen >= c->wbuf_pagesize) {
713 ret = c->mtd->write(c->mtd, outvec_to, PAGE_DIV(vlen),
715 if (ret < 0 || wbuf_retlen != PAGE_DIV(vlen))
719 outvec_to += wbuf_retlen;
720 c->wbuf_ofs = outvec_to;
721 donelen += wbuf_retlen;
725 wbuf_retlen = jffs2_fill_wbuf(c, v, vlen);
726 if (c->wbuf_len == c->wbuf_pagesize) {
727 ret = __jffs2_flush_wbuf(c, NOPAD);
732 outvec_to += wbuf_retlen;
733 donelen += wbuf_retlen;
737 * If there's a remainder in the wbuf and it's a non-GC write,
738 * remember that the wbuf affects this ino
742 if (jffs2_sum_active()) {
743 int res = jffs2_sum_add_kvec(c, invecs, count, (uint32_t) to);
748 if (c->wbuf_len && ino)
749 jffs2_wbuf_dirties_inode(c, ino);
752 up_write(&c->wbuf_sem);
757 * At this point we have no problem, c->wbuf is empty. However
758 * refile nextblock to avoid writing again to same address.
761 spin_lock(&c->erase_completion_lock);
763 jeb = &c->blocks[outvec_to / c->sector_size];
764 jffs2_block_refile(c, jeb, REFILE_ANYWAY);
766 spin_unlock(&c->erase_completion_lock);
770 up_write(&c->wbuf_sem);
775 * This is the entry for flash write.
776 * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev
778 int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, const u_char *buf)
782 if (!jffs2_is_writebuffered(c))
783 return jffs2_flash_direct_write(c, ofs, len, retlen, buf);
785 vecs[0].iov_base = (unsigned char *) buf;
786 vecs[0].iov_len = len;
787 return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0);
791 Handle readback from writebuffer and ECC failure return
793 int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf)
795 loff_t orbf = 0, owbf = 0, lwbf = 0;
798 if (!jffs2_is_writebuffered(c))
799 return c->mtd->read(c->mtd, ofs, len, retlen, buf);
802 down_read(&c->wbuf_sem);
803 if (jffs2_cleanmarker_oob(c))
804 ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo);
806 ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);
808 if ( (ret == -EBADMSG) && (*retlen == len) ) {
809 printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n",
812 * We have the raw data without ECC correction in the buffer, maybe
813 * we are lucky and all data or parts are correct. We check the node.
814 * If data are corrupted node check will sort it out.
815 * We keep this block, it will fail on write or erase and the we
816 * mark it bad. Or should we do that now? But we should give him a chance.
817 * Maybe we had a system crash or power loss before the ecc write or
818 * a erase was completed.
819 * So we return success. :)
824 /* if no writebuffer available or write buffer empty, return */
825 if (!c->wbuf_pagesize || !c->wbuf_len)
828 /* if we read in a different block, return */
829 if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs))
832 if (ofs >= c->wbuf_ofs) {
833 owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */
834 if (owbf > c->wbuf_len) /* is read beyond write buffer ? */
836 lwbf = c->wbuf_len - owbf; /* number of bytes to copy */
840 orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */
841 if (orbf > len) /* is write beyond write buffer ? */
843 lwbf = len - orbf; /* number of bytes to copy */
844 if (lwbf > c->wbuf_len)
848 memcpy(buf+orbf,c->wbuf+owbf,lwbf);
851 up_read(&c->wbuf_sem);
856 * Check, if the out of band area is empty
858 int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int mode)
866 /* allocate a buffer for all oob data in this sector */
867 oob_size = c->mtd->oobsize;
869 buf = kmalloc(len, GFP_KERNEL);
871 printk(KERN_NOTICE "jffs2_check_oob_empty(): allocation of temporary data buffer for oob check failed\n");
875 * if mode = 0, we scan for a total empty oob area, else we have
876 * to take care of the cleanmarker in the first page of the block
878 ret = jffs2_flash_read_oob(c, jeb->offset, len , &retlen, buf);
880 D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB failed %d for block at %08x\n", ret, jeb->offset));
885 D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB return short read "
886 "(%zd bytes not %d) for block at %08x\n", retlen, len, jeb->offset));
891 /* Special check for first page */
892 for(i = 0; i < oob_size ; i++) {
893 /* Yeah, we know about the cleanmarker. */
894 if (mode && i >= c->fsdata_pos &&
895 i < c->fsdata_pos + c->fsdata_len)
898 if (buf[i] != 0xFF) {
899 D2(printk(KERN_DEBUG "Found %02x at %x in OOB for %08x\n",
900 buf[i], i, jeb->offset));
906 /* we know, we are aligned :) */
907 for (page = oob_size; page < len; page += sizeof(long)) {
908 unsigned long dat = *(unsigned long *)(&buf[page]);
922 * Scan for a valid cleanmarker and for bad blocks
923 * For virtual blocks (concatenated physical blocks) check the cleanmarker
924 * only in the first page of the first physical block, but scan for bad blocks in all
927 int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
929 struct jffs2_unknown_node n;
930 unsigned char buf[2 * NAND_MAX_OOBSIZE];
932 int ret, i, cnt, retval = 0;
933 size_t retlen, offset;
936 offset = jeb->offset;
937 oob_size = c->mtd->oobsize;
939 /* Loop through the physical blocks */
940 for (cnt = 0; cnt < (c->sector_size / c->mtd->erasesize); cnt++) {
941 /* Check first if the block is bad. */
942 if (c->mtd->block_isbad (c->mtd, offset)) {
943 D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Bad block at %08x\n", jeb->offset));
947 * We read oob data from page 0 and 1 of the block.
948 * page 0 contains cleanmarker and badblock info
949 * page 1 contains failure count of this block
951 ret = c->mtd->read_oob (c->mtd, offset, oob_size << 1, &retlen, buf);
954 D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB failed %d for block at %08x\n", ret, jeb->offset));
957 if (retlen < (oob_size << 1)) {
958 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));
962 /* Check cleanmarker only on the first physical block */
964 n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
965 n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
966 n.totlen = cpu_to_je32 (8);
967 p = (unsigned char *) &n;
969 for (i = 0; i < c->fsdata_len; i++) {
970 if (buf[c->fsdata_pos + i] != p[i]) {
974 D1(if (retval == 1) {
975 printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): Cleanmarker node not detected in block at %08x\n", jeb->offset);
976 printk(KERN_WARNING "OOB at %08x was ", offset);
977 for (i=0; i < oob_size; i++) {
978 printk("%02x ", buf[i]);
983 offset += c->mtd->erasesize;
988 int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
990 struct jffs2_unknown_node n;
994 n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
995 n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER);
996 n.totlen = cpu_to_je32(8);
998 ret = jffs2_flash_write_oob(c, jeb->offset + c->fsdata_pos, c->fsdata_len, &retlen, (unsigned char *)&n);
1001 D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
1004 if (retlen != c->fsdata_len) {
1005 D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Short write for block at %08x: %zd not %d\n", jeb->offset, retlen, c->fsdata_len));
1012 * On NAND we try to mark this block bad. If the block was erased more
1013 * than MAX_ERASE_FAILURES we mark it finaly bad.
1014 * Don't care about failures. This block remains on the erase-pending
1015 * or badblock list as long as nobody manipulates the flash with
1016 * a bootloader or something like that.
1019 int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
1023 /* if the count is < max, we try to write the counter to the 2nd page oob area */
1024 if( ++jeb->bad_count < MAX_ERASE_FAILURES)
1027 if (!c->mtd->block_markbad)
1028 return 1; // What else can we do?
1030 D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset));
1031 ret = c->mtd->block_markbad(c->mtd, bad_offset);
1034 D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
1040 #define NAND_JFFS2_OOB16_FSDALEN 8
1042 static struct nand_oobinfo jffs2_oobinfo_docecc = {
1043 .useecc = MTD_NANDECC_PLACE,
1045 .eccpos = {0,1,2,3,4,5}
1049 static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
1051 struct nand_oobinfo *oinfo = &c->mtd->oobinfo;
1053 /* Do this only, if we have an oob buffer */
1054 if (!c->mtd->oobsize)
1057 /* Cleanmarker is out-of-band, so inline size zero */
1058 c->cleanmarker_size = 0;
1060 /* Should we use autoplacement ? */
1061 if (oinfo && oinfo->useecc == MTD_NANDECC_AUTOPLACE) {
1062 D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n"));
1063 /* Get the position of the free bytes */
1064 if (!oinfo->oobfree[0][1]) {
1065 printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep. Autoplacement selected and no empty space in oob\n");
1068 c->fsdata_pos = oinfo->oobfree[0][0];
1069 c->fsdata_len = oinfo->oobfree[0][1];
1070 if (c->fsdata_len > 8)
1073 /* This is just a legacy fallback and should go away soon */
1074 switch(c->mtd->ecctype) {
1075 case MTD_ECC_RS_DiskOnChip:
1076 printk(KERN_WARNING "JFFS2 using DiskOnChip hardware ECC without autoplacement. Fix it!\n");
1077 c->oobinfo = &jffs2_oobinfo_docecc;
1079 c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN;
1080 c->badblock_pos = 15;
1084 D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n"));
1091 int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
1095 /* Initialise write buffer */
1096 init_rwsem(&c->wbuf_sem);
1097 c->wbuf_pagesize = c->mtd->writesize;
1098 c->wbuf_ofs = 0xFFFFFFFF;
1100 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1104 res = jffs2_nand_set_oobinfo(c);
1108 brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1113 memset(brokenbuf, 0xdb, c->wbuf_pagesize);
1118 void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
1123 int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
1124 c->cleanmarker_size = 0; /* No cleanmarkers needed */
1126 /* Initialize write buffer */
1127 init_rwsem(&c->wbuf_sem);
1130 c->wbuf_pagesize = c->mtd->erasesize;
1132 /* Find a suitable c->sector_size
1133 * - Not too much sectors
1134 * - Sectors have to be at least 4 K + some bytes
1135 * - All known dataflashes have erase sizes of 528 or 1056
1136 * - we take at least 8 eraseblocks and want to have at least 8K size
1137 * - The concatenation should be a power of 2
1140 c->sector_size = 8 * c->mtd->erasesize;
1142 while (c->sector_size < 8192) {
1143 c->sector_size *= 2;
1146 /* It may be necessary to adjust the flash size */
1147 c->flash_size = c->mtd->size;
1149 if ((c->flash_size % c->sector_size) != 0) {
1150 c->flash_size = (c->flash_size / c->sector_size) * c->sector_size;
1151 printk(KERN_WARNING "JFFS2 flash size adjusted to %dKiB\n", c->flash_size);
1154 c->wbuf_ofs = 0xFFFFFFFF;
1155 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1159 printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size);
1164 void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
1168 int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
1169 /* Cleanmarker currently occupies whole programming regions,
1170 * either one or 2 for 8Byte STMicro flashes. */
1171 c->cleanmarker_size = max(16u, c->mtd->writesize);
1173 /* Initialize write buffer */
1174 init_rwsem(&c->wbuf_sem);
1175 c->wbuf_pagesize = c->mtd->writesize;
1176 c->wbuf_ofs = 0xFFFFFFFF;
1178 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1185 void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {