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 1.99 2005/09/21 16:11:04 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 /* max. erase failures before we mark a block bad */
34 #define MAX_ERASE_FAILURES 2
36 struct jffs2_inodirty {
38 struct jffs2_inodirty *next;
41 static struct jffs2_inodirty inodirty_nomem;
43 static int jffs2_wbuf_pending_for_ino(struct jffs2_sb_info *c, uint32_t ino)
45 struct jffs2_inodirty *this = c->wbuf_inodes;
47 /* If a malloc failed, consider _everything_ dirty */
48 if (this == &inodirty_nomem)
51 /* If ino == 0, _any_ non-GC writes mean 'yes' */
55 /* Look to see if the inode in question is pending in the wbuf */
64 static void jffs2_clear_wbuf_ino_list(struct jffs2_sb_info *c)
66 struct jffs2_inodirty *this;
68 this = c->wbuf_inodes;
70 if (this != &inodirty_nomem) {
72 struct jffs2_inodirty *next = this->next;
77 c->wbuf_inodes = NULL;
80 static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino)
82 struct jffs2_inodirty *new;
84 /* Mark the superblock dirty so that kupdated will flush... */
85 jffs2_erase_pending_trigger(c);
87 if (jffs2_wbuf_pending_for_ino(c, ino))
90 new = kmalloc(sizeof(*new), GFP_KERNEL);
92 D1(printk(KERN_DEBUG "No memory to allocate inodirty. Fallback to all considered dirty\n"));
93 jffs2_clear_wbuf_ino_list(c);
94 c->wbuf_inodes = &inodirty_nomem;
98 new->next = c->wbuf_inodes;
103 static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c)
105 struct list_head *this, *next;
108 if (list_empty(&c->erasable_pending_wbuf_list))
111 list_for_each_safe(this, next, &c->erasable_pending_wbuf_list) {
112 struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
114 D1(printk(KERN_DEBUG "Removing eraseblock at 0x%08x from erasable_pending_wbuf_list...\n", jeb->offset));
116 if ((jiffies + (n++)) & 127) {
117 /* Most of the time, we just erase it immediately. Otherwise we
118 spend ages scanning it on mount, etc. */
119 D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n"));
120 list_add_tail(&jeb->list, &c->erase_pending_list);
121 c->nr_erasing_blocks++;
122 jffs2_erase_pending_trigger(c);
124 /* Sometimes, however, we leave it elsewhere so it doesn't get
125 immediately reused, and we spread the load a bit. */
126 D1(printk(KERN_DEBUG "...and adding to erasable_list\n"));
127 list_add_tail(&jeb->list, &c->erasable_list);
132 #define REFILE_NOTEMPTY 0
133 #define REFILE_ANYWAY 1
135 static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int allow_empty)
137 D1(printk("About to refile bad block at %08x\n", jeb->offset));
139 /* File the existing block on the bad_used_list.... */
140 if (c->nextblock == jeb)
142 else /* Not sure this should ever happen... need more coffee */
143 list_del(&jeb->list);
144 if (jeb->first_node) {
145 D1(printk("Refiling block at %08x to bad_used_list\n", jeb->offset));
146 list_add(&jeb->list, &c->bad_used_list);
148 BUG_ON(allow_empty == REFILE_NOTEMPTY);
149 /* It has to have had some nodes or we couldn't be here */
150 D1(printk("Refiling block at %08x to erase_pending_list\n", jeb->offset));
151 list_add(&jeb->list, &c->erase_pending_list);
152 c->nr_erasing_blocks++;
153 jffs2_erase_pending_trigger(c);
156 /* Adjust its size counts accordingly */
157 c->wasted_size += jeb->free_size;
158 c->free_size -= jeb->free_size;
159 jeb->wasted_size += jeb->free_size;
162 jffs2_dbg_dump_block_lists_nolock(c);
163 jffs2_dbg_acct_sanity_check_nolock(c,jeb);
164 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
167 /* Recover from failure to write wbuf. Recover the nodes up to the
168 * wbuf, not the one which we were starting to try to write. */
170 static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
172 struct jffs2_eraseblock *jeb, *new_jeb;
173 struct jffs2_raw_node_ref **first_raw, **raw;
177 uint32_t start, end, ofs, len;
179 spin_lock(&c->erase_completion_lock);
181 jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
183 jffs2_block_refile(c, jeb, REFILE_NOTEMPTY);
185 /* Find the first node to be recovered, by skipping over every
186 node which ends before the wbuf starts, or which is obsolete. */
187 first_raw = &jeb->first_node;
189 (ref_obsolete(*first_raw) ||
190 (ref_offset(*first_raw)+ref_totlen(c, jeb, *first_raw)) < c->wbuf_ofs)) {
191 D1(printk(KERN_DEBUG "Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n",
192 ref_offset(*first_raw), ref_flags(*first_raw),
193 (ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw)),
195 first_raw = &(*first_raw)->next_phys;
199 /* All nodes were obsolete. Nothing to recover. */
200 D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n"));
201 spin_unlock(&c->erase_completion_lock);
205 start = ref_offset(*first_raw);
206 end = ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw);
208 /* Find the last node to be recovered */
211 if (!ref_obsolete(*raw))
212 end = ref_offset(*raw) + ref_totlen(c, jeb, *raw);
214 raw = &(*raw)->next_phys;
216 spin_unlock(&c->erase_completion_lock);
218 D1(printk(KERN_DEBUG "wbuf recover %08x-%08x\n", start, end));
221 if (start < c->wbuf_ofs) {
222 /* First affected node was already partially written.
223 * Attempt to reread the old data into our buffer. */
225 buf = kmalloc(end - start, GFP_KERNEL);
227 printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n");
233 if (jffs2_cleanmarker_oob(c))
234 ret = c->mtd->read_ecc(c->mtd, start, c->wbuf_ofs - start, &retlen, buf, NULL, c->oobinfo);
236 ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf);
238 if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) {
242 if (ret || retlen != c->wbuf_ofs - start) {
243 printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n");
248 first_raw = &(*first_raw)->next_phys;
249 /* If this was the only node to be recovered, give up */
253 /* It wasn't. Go on and try to recover nodes complete in the wbuf */
254 start = ref_offset(*first_raw);
256 /* Read succeeded. Copy the remaining data from the wbuf */
257 memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs);
260 /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards.
261 Either 'buf' contains the data, or we find it in the wbuf */
264 /* ... and get an allocation of space from a shiny new block instead */
265 ret = jffs2_reserve_space_gc(c, end-start, &ofs, &len, JFFS2_SUMMARY_NOSUM_SIZE);
267 printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n");
271 if (end-start >= c->wbuf_pagesize) {
272 /* Need to do another write immediately, but it's possible
273 that this is just because the wbuf itself is completely
274 full, and there's nothing earlier read back from the
275 flash. Hence 'buf' isn't necessarily what we're writing
277 unsigned char *rewrite_buf = buf?:c->wbuf;
278 uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize);
280 D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n",
285 if (breakme++ == 20) {
286 printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs);
288 c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen,
289 brokenbuf, NULL, c->oobinfo);
293 if (jffs2_cleanmarker_oob(c))
294 ret = c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen,
295 rewrite_buf, NULL, c->oobinfo);
297 ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, rewrite_buf);
299 if (ret || retlen != towrite) {
300 /* Argh. We tried. Really we did. */
301 printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n");
305 struct jffs2_raw_node_ref *raw2;
307 raw2 = jffs2_alloc_raw_node_ref();
311 raw2->flash_offset = ofs | REF_OBSOLETE;
312 raw2->__totlen = ref_totlen(c, jeb, *first_raw);
313 raw2->next_phys = NULL;
314 raw2->next_in_ino = NULL;
316 jffs2_add_physical_node_ref(c, raw2);
320 printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs);
322 c->wbuf_len = (end - start) - towrite;
323 c->wbuf_ofs = ofs + towrite;
324 memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len);
325 /* Don't muck about with c->wbuf_inodes. False positives are harmless. */
329 /* OK, now we're left with the dregs in whichever buffer we're using */
331 memcpy(c->wbuf, buf, end-start);
334 memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start);
337 c->wbuf_len = end - start;
340 /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */
341 new_jeb = &c->blocks[ofs / c->sector_size];
343 spin_lock(&c->erase_completion_lock);
344 if (new_jeb->first_node) {
345 /* Odd, but possible with ST flash later maybe */
346 new_jeb->last_node->next_phys = *first_raw;
348 new_jeb->first_node = *first_raw;
353 uint32_t rawlen = ref_totlen(c, jeb, *raw);
355 D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n",
356 rawlen, ref_offset(*raw), ref_flags(*raw), ofs));
358 if (ref_obsolete(*raw)) {
359 /* Shouldn't really happen much */
360 new_jeb->dirty_size += rawlen;
361 new_jeb->free_size -= rawlen;
362 c->dirty_size += rawlen;
364 new_jeb->used_size += rawlen;
365 new_jeb->free_size -= rawlen;
366 jeb->dirty_size += rawlen;
367 jeb->used_size -= rawlen;
368 c->dirty_size += rawlen;
370 c->free_size -= rawlen;
371 (*raw)->flash_offset = ofs | ref_flags(*raw);
373 new_jeb->last_node = *raw;
375 raw = &(*raw)->next_phys;
378 /* Fix up the original jeb now it's on the bad_list */
380 if (first_raw == &jeb->first_node) {
381 jeb->last_node = NULL;
382 D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset));
383 list_del(&jeb->list);
384 list_add(&jeb->list, &c->erase_pending_list);
385 c->nr_erasing_blocks++;
386 jffs2_erase_pending_trigger(c);
389 jeb->last_node = container_of(first_raw, struct jffs2_raw_node_ref, next_phys);
391 jffs2_dbg_acct_sanity_check_nolock(c, jeb);
392 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
394 jffs2_dbg_acct_sanity_check_nolock(c, new_jeb);
395 jffs2_dbg_acct_paranoia_check_nolock(c, new_jeb);
397 spin_unlock(&c->erase_completion_lock);
399 D1(printk(KERN_DEBUG "wbuf recovery completed OK\n"));
402 /* Meaning of pad argument:
403 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway.
404 1: Pad, do not adjust nextblock free_size
405 2: Pad, adjust nextblock free_size
408 #define PAD_NOACCOUNT 1
409 #define PAD_ACCOUNTING 2
411 static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
416 /* Nothing to do if not write-buffering the flash. In particular, we shouldn't
417 del_timer() the timer we never initialised. */
418 if (!jffs2_is_writebuffered(c))
421 if (!down_trylock(&c->alloc_sem)) {
423 printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n");
427 if (!c->wbuf_len) /* already checked c->wbuf above */
430 /* claim remaining space on the page
431 this happens, if we have a change to a new block,
432 or if fsync forces us to flush the writebuffer.
433 if we have a switch to next page, we will not have
434 enough remaining space for this.
436 if (pad && !jffs2_dataflash(c)) {
437 c->wbuf_len = PAD(c->wbuf_len);
439 /* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR
440 with 8 byte page size */
441 memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len);
443 if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) {
444 struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len);
445 padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
446 padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING);
447 padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len);
448 padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4));
451 /* else jffs2_flash_writev has actually filled in the rest of the
452 buffer for us, and will deal with the node refs etc. later. */
456 if (breakme++ == 20) {
457 printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs);
459 c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize,
460 &retlen, brokenbuf, NULL, c->oobinfo);
465 if (jffs2_cleanmarker_oob(c))
466 ret = c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf, NULL, c->oobinfo);
468 ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf);
470 if (ret || retlen != c->wbuf_pagesize) {
472 printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret);
474 printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n",
475 retlen, c->wbuf_pagesize);
479 jffs2_wbuf_recover(c);
484 spin_lock(&c->erase_completion_lock);
486 /* Adjust free size of the block if we padded. */
487 if (pad && !jffs2_dataflash(c)) {
488 struct jffs2_eraseblock *jeb;
490 jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
492 D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n",
493 (jeb==c->nextblock)?"next":"", jeb->offset));
495 /* wbuf_pagesize - wbuf_len is the amount of space that's to be
496 padded. If there is less free space in the block than that,
497 something screwed up */
498 if (jeb->free_size < (c->wbuf_pagesize - c->wbuf_len)) {
499 printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n",
500 c->wbuf_ofs, c->wbuf_len, c->wbuf_pagesize-c->wbuf_len);
501 printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n",
502 jeb->offset, jeb->free_size);
505 jeb->free_size -= (c->wbuf_pagesize - c->wbuf_len);
506 c->free_size -= (c->wbuf_pagesize - c->wbuf_len);
507 jeb->wasted_size += (c->wbuf_pagesize - c->wbuf_len);
508 c->wasted_size += (c->wbuf_pagesize - c->wbuf_len);
511 /* Stick any now-obsoleted blocks on the erase_pending_list */
512 jffs2_refile_wbuf_blocks(c);
513 jffs2_clear_wbuf_ino_list(c);
514 spin_unlock(&c->erase_completion_lock);
516 memset(c->wbuf,0xff,c->wbuf_pagesize);
517 /* adjust write buffer offset, else we get a non contiguous write bug */
518 c->wbuf_ofs += c->wbuf_pagesize;
523 /* Trigger garbage collection to flush the write-buffer.
524 If ino arg is zero, do it if _any_ real (i.e. not GC) writes are
525 outstanding. If ino arg non-zero, do it only if a write for the
526 given inode is outstanding. */
527 int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino)
529 uint32_t old_wbuf_ofs;
530 uint32_t old_wbuf_len;
533 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino));
539 if (!jffs2_wbuf_pending_for_ino(c, ino)) {
540 D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino));
545 old_wbuf_ofs = c->wbuf_ofs;
546 old_wbuf_len = c->wbuf_len;
548 if (c->unchecked_size) {
549 /* GC won't make any progress for a while */
550 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n"));
551 down_write(&c->wbuf_sem);
552 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
553 /* retry flushing wbuf in case jffs2_wbuf_recover
554 left some data in the wbuf */
556 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
557 up_write(&c->wbuf_sem);
558 } else while (old_wbuf_len &&
559 old_wbuf_ofs == c->wbuf_ofs) {
563 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n"));
565 ret = jffs2_garbage_collect_pass(c);
567 /* GC failed. Flush it with padding instead */
569 down_write(&c->wbuf_sem);
570 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
571 /* retry flushing wbuf in case jffs2_wbuf_recover
572 left some data in the wbuf */
574 ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
575 up_write(&c->wbuf_sem);
581 D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n"));
587 /* Pad write-buffer to end and write it, wasting space. */
588 int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
595 down_write(&c->wbuf_sem);
596 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
597 /* retry - maybe wbuf recover left some data in wbuf. */
599 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
600 up_write(&c->wbuf_sem);
605 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
606 #define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
607 #define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
609 #define PAGE_DIV(x) ( (x) & (~(c->wbuf_pagesize - 1)) )
610 #define PAGE_MOD(x) ( (x) & (c->wbuf_pagesize - 1) )
613 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)
615 struct kvec outvecs[3];
617 uint32_t split_ofs = 0;
619 int ret, splitvec = -1;
622 unsigned char *wbuf_ptr;
624 uint32_t outvec_to = to;
626 /* If not NAND flash, don't bother */
627 if (!jffs2_is_writebuffered(c))
628 return jffs2_flash_direct_writev(c, invecs, count, to, retlen);
630 down_write(&c->wbuf_sem);
632 /* If wbuf_ofs is not initialized, set it to target address */
633 if (c->wbuf_ofs == 0xFFFFFFFF) {
634 c->wbuf_ofs = PAGE_DIV(to);
635 c->wbuf_len = PAGE_MOD(to);
636 memset(c->wbuf,0xff,c->wbuf_pagesize);
639 /* Fixup the wbuf if we are moving to a new eraseblock. The checks below
640 fail for ECC'd NOR because cleanmarker == 16, so a block starts at
642 if (jffs2_nor_ecc(c)) {
643 if (((c->wbuf_ofs % c->sector_size) == 0) && !c->wbuf_len) {
644 c->wbuf_ofs = PAGE_DIV(to);
645 c->wbuf_len = PAGE_MOD(to);
646 memset(c->wbuf,0xff,c->wbuf_pagesize);
650 /* Sanity checks on target address.
651 It's permitted to write at PAD(c->wbuf_len+c->wbuf_ofs),
652 and it's permitted to write at the beginning of a new
653 erase block. Anything else, and you die.
654 New block starts at xxx000c (0-b = block header)
656 if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) {
657 /* It's a write to a new block */
659 D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx causes flush of wbuf at 0x%08x\n", (unsigned long)to, c->wbuf_ofs));
660 ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
662 /* the underlying layer has to check wbuf_len to do the cleanup */
663 D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret));
668 /* set pointer to new block */
669 c->wbuf_ofs = PAGE_DIV(to);
670 c->wbuf_len = PAGE_MOD(to);
673 if (to != PAD(c->wbuf_ofs + c->wbuf_len)) {
674 /* We're not writing immediately after the writebuffer. Bad. */
675 printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write to %08lx\n", (unsigned long)to);
677 printk(KERN_CRIT "wbuf was previously %08x-%08x\n",
678 c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len);
682 /* Note outvecs[3] above. We know count is never greater than 2 */
684 printk(KERN_CRIT "jffs2_flash_writev(): count is %ld\n", count);
691 /* Fill writebuffer first, if already in use */
693 uint32_t invec_ofs = 0;
695 /* adjust alignment offset */
696 if (c->wbuf_len != PAGE_MOD(to)) {
697 c->wbuf_len = PAGE_MOD(to);
698 /* take care of alignment to next page */
700 c->wbuf_len = c->wbuf_pagesize;
703 while(c->wbuf_len < c->wbuf_pagesize) {
709 thislen = c->wbuf_pagesize - c->wbuf_len;
711 if (thislen >= invecs[invec].iov_len)
712 thislen = invecs[invec].iov_len;
716 memcpy(c->wbuf + c->wbuf_len, invecs[invec].iov_base, thislen);
717 c->wbuf_len += thislen;
719 /* Get next invec, if actual did not fill the buffer */
720 if (c->wbuf_len < c->wbuf_pagesize)
724 /* write buffer is full, flush buffer */
725 ret = __jffs2_flush_wbuf(c, NOPAD);
727 /* the underlying layer has to check wbuf_len to do the cleanup */
728 D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret));
729 /* Retlen zero to make sure our caller doesn't mark the space dirty.
730 We've already done everything that's necessary */
734 outvec_to += donelen;
735 c->wbuf_ofs = outvec_to;
737 /* All invecs done ? */
741 /* Set up the first outvec, containing the remainder of the
742 invec we partially used */
743 if (invecs[invec].iov_len > invec_ofs) {
744 outvecs[0].iov_base = invecs[invec].iov_base+invec_ofs;
745 totlen = outvecs[0].iov_len = invecs[invec].iov_len-invec_ofs;
746 if (totlen > c->wbuf_pagesize) {
748 split_ofs = outvecs[0].iov_len - PAGE_MOD(totlen);
755 /* OK, now we've flushed the wbuf and the start of the bits
756 we have been asked to write, now to write the rest.... */
758 /* totlen holds the amount of data still to be written */
760 for ( ; invec < count; invec++,outvec++ ) {
761 outvecs[outvec].iov_base = invecs[invec].iov_base;
762 totlen += outvecs[outvec].iov_len = invecs[invec].iov_len;
763 if (PAGE_DIV(totlen) != PAGE_DIV(old_totlen)) {
765 split_ofs = outvecs[outvec].iov_len - PAGE_MOD(totlen);
770 /* Now the outvecs array holds all the remaining data to write */
771 /* Up to splitvec,split_ofs is to be written immediately. The rest
772 goes into the (now-empty) wbuf */
774 if (splitvec != -1) {
777 remainder = outvecs[splitvec].iov_len - split_ofs;
778 outvecs[splitvec].iov_len = split_ofs;
780 /* We did cross a page boundary, so we write some now */
781 if (jffs2_cleanmarker_oob(c))
782 ret = c->mtd->writev_ecc(c->mtd, outvecs, splitvec+1, outvec_to, &wbuf_retlen, NULL, c->oobinfo);
784 ret = jffs2_flash_direct_writev(c, outvecs, splitvec+1, outvec_to, &wbuf_retlen);
786 if (ret < 0 || wbuf_retlen != PAGE_DIV(totlen)) {
787 /* At this point we have no problem,
788 c->wbuf is empty. However refile nextblock to avoid
789 writing again to same address.
791 struct jffs2_eraseblock *jeb;
793 spin_lock(&c->erase_completion_lock);
795 jeb = &c->blocks[outvec_to / c->sector_size];
796 jffs2_block_refile(c, jeb, REFILE_ANYWAY);
799 spin_unlock(&c->erase_completion_lock);
803 donelen += wbuf_retlen;
804 c->wbuf_ofs = PAGE_DIV(outvec_to) + PAGE_DIV(totlen);
807 outvecs[splitvec].iov_base += split_ofs;
808 outvecs[splitvec].iov_len = remainder;
817 /* Now splitvec points to the start of the bits we have to copy
821 for ( ; splitvec < outvec; splitvec++) {
822 /* Don't copy the wbuf into itself */
823 if (outvecs[splitvec].iov_base == c->wbuf)
825 memcpy(wbuf_ptr, outvecs[splitvec].iov_base, outvecs[splitvec].iov_len);
826 wbuf_ptr += outvecs[splitvec].iov_len;
827 donelen += outvecs[splitvec].iov_len;
829 c->wbuf_len = wbuf_ptr - c->wbuf;
831 /* If there's a remainder in the wbuf and it's a non-GC write,
832 remember that the wbuf affects this ino */
836 if (jffs2_sum_active()) {
837 int res = jffs2_sum_add_kvec(c, invecs, count, (uint32_t) to);
842 if (c->wbuf_len && ino)
843 jffs2_wbuf_dirties_inode(c, ino);
848 up_write(&c->wbuf_sem);
853 * This is the entry for flash write.
854 * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev
856 int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, const u_char *buf)
860 if (!jffs2_is_writebuffered(c))
861 return jffs2_flash_direct_write(c, ofs, len, retlen, buf);
863 vecs[0].iov_base = (unsigned char *) buf;
864 vecs[0].iov_len = len;
865 return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0);
869 Handle readback from writebuffer and ECC failure return
871 int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf)
873 loff_t orbf = 0, owbf = 0, lwbf = 0;
876 if (!jffs2_is_writebuffered(c))
877 return c->mtd->read(c->mtd, ofs, len, retlen, buf);
880 down_read(&c->wbuf_sem);
881 if (jffs2_cleanmarker_oob(c))
882 ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo);
884 ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);
886 if ( (ret == -EBADMSG) && (*retlen == len) ) {
887 printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n",
890 * We have the raw data without ECC correction in the buffer, maybe
891 * we are lucky and all data or parts are correct. We check the node.
892 * If data are corrupted node check will sort it out.
893 * We keep this block, it will fail on write or erase and the we
894 * mark it bad. Or should we do that now? But we should give him a chance.
895 * Maybe we had a system crash or power loss before the ecc write or
896 * a erase was completed.
897 * So we return success. :)
902 /* if no writebuffer available or write buffer empty, return */
903 if (!c->wbuf_pagesize || !c->wbuf_len)
906 /* if we read in a different block, return */
907 if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs))
910 if (ofs >= c->wbuf_ofs) {
911 owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */
912 if (owbf > c->wbuf_len) /* is read beyond write buffer ? */
914 lwbf = c->wbuf_len - owbf; /* number of bytes to copy */
918 orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */
919 if (orbf > len) /* is write beyond write buffer ? */
921 lwbf = len - orbf; /* number of bytes to copy */
922 if (lwbf > c->wbuf_len)
926 memcpy(buf+orbf,c->wbuf+owbf,lwbf);
929 up_read(&c->wbuf_sem);
934 * Check, if the out of band area is empty
936 int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int mode)
944 /* allocate a buffer for all oob data in this sector */
945 oob_size = c->mtd->oobsize;
947 buf = kmalloc(len, GFP_KERNEL);
949 printk(KERN_NOTICE "jffs2_check_oob_empty(): allocation of temporary data buffer for oob check failed\n");
953 * if mode = 0, we scan for a total empty oob area, else we have
954 * to take care of the cleanmarker in the first page of the block
956 ret = jffs2_flash_read_oob(c, jeb->offset, len , &retlen, buf);
958 D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB failed %d for block at %08x\n", ret, jeb->offset));
963 D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB return short read "
964 "(%zd bytes not %d) for block at %08x\n", retlen, len, jeb->offset));
969 /* Special check for first page */
970 for(i = 0; i < oob_size ; i++) {
971 /* Yeah, we know about the cleanmarker. */
972 if (mode && i >= c->fsdata_pos &&
973 i < c->fsdata_pos + c->fsdata_len)
976 if (buf[i] != 0xFF) {
977 D2(printk(KERN_DEBUG "Found %02x at %x in OOB for %08x\n",
978 buf[i], i, jeb->offset));
984 /* we know, we are aligned :) */
985 for (page = oob_size; page < len; page += sizeof(long)) {
986 unsigned long dat = *(unsigned long *)(&buf[page]);
1000 * Scan for a valid cleanmarker and for bad blocks
1001 * For virtual blocks (concatenated physical blocks) check the cleanmarker
1002 * only in the first page of the first physical block, but scan for bad blocks in all
1005 int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
1007 struct jffs2_unknown_node n;
1008 unsigned char buf[2 * NAND_MAX_OOBSIZE];
1010 int ret, i, cnt, retval = 0;
1011 size_t retlen, offset;
1014 offset = jeb->offset;
1015 oob_size = c->mtd->oobsize;
1017 /* Loop through the physical blocks */
1018 for (cnt = 0; cnt < (c->sector_size / c->mtd->erasesize); cnt++) {
1019 /* Check first if the block is bad. */
1020 if (c->mtd->block_isbad (c->mtd, offset)) {
1021 D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Bad block at %08x\n", jeb->offset));
1025 * We read oob data from page 0 and 1 of the block.
1026 * page 0 contains cleanmarker and badblock info
1027 * page 1 contains failure count of this block
1029 ret = c->mtd->read_oob (c->mtd, offset, oob_size << 1, &retlen, buf);
1032 D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB failed %d for block at %08x\n", ret, jeb->offset));
1035 if (retlen < (oob_size << 1)) {
1036 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));
1040 /* Check cleanmarker only on the first physical block */
1042 n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
1043 n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
1044 n.totlen = cpu_to_je32 (8);
1045 p = (unsigned char *) &n;
1047 for (i = 0; i < c->fsdata_len; i++) {
1048 if (buf[c->fsdata_pos + i] != p[i]) {
1052 D1(if (retval == 1) {
1053 printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): Cleanmarker node not detected in block at %08x\n", jeb->offset);
1054 printk(KERN_WARNING "OOB at %08x was ", offset);
1055 for (i=0; i < oob_size; i++) {
1056 printk("%02x ", buf[i]);
1061 offset += c->mtd->erasesize;
1066 int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
1068 struct jffs2_unknown_node n;
1072 n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
1073 n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER);
1074 n.totlen = cpu_to_je32(8);
1076 ret = jffs2_flash_write_oob(c, jeb->offset + c->fsdata_pos, c->fsdata_len, &retlen, (unsigned char *)&n);
1079 D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
1082 if (retlen != c->fsdata_len) {
1083 D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Short write for block at %08x: %zd not %d\n", jeb->offset, retlen, c->fsdata_len));
1090 * On NAND we try to mark this block bad. If the block was erased more
1091 * than MAX_ERASE_FAILURES we mark it finaly bad.
1092 * Don't care about failures. This block remains on the erase-pending
1093 * or badblock list as long as nobody manipulates the flash with
1094 * a bootloader or something like that.
1097 int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
1101 /* if the count is < max, we try to write the counter to the 2nd page oob area */
1102 if( ++jeb->bad_count < MAX_ERASE_FAILURES)
1105 if (!c->mtd->block_markbad)
1106 return 1; // What else can we do?
1108 D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset));
1109 ret = c->mtd->block_markbad(c->mtd, bad_offset);
1112 D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
1118 #define NAND_JFFS2_OOB16_FSDALEN 8
1120 static struct nand_oobinfo jffs2_oobinfo_docecc = {
1121 .useecc = MTD_NANDECC_PLACE,
1123 .eccpos = {0,1,2,3,4,5}
1127 static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
1129 struct nand_oobinfo *oinfo = &c->mtd->oobinfo;
1131 /* Do this only, if we have an oob buffer */
1132 if (!c->mtd->oobsize)
1135 /* Cleanmarker is out-of-band, so inline size zero */
1136 c->cleanmarker_size = 0;
1138 /* Should we use autoplacement ? */
1139 if (oinfo && oinfo->useecc == MTD_NANDECC_AUTOPLACE) {
1140 D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n"));
1141 /* Get the position of the free bytes */
1142 if (!oinfo->oobfree[0][1]) {
1143 printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep. Autoplacement selected and no empty space in oob\n");
1146 c->fsdata_pos = oinfo->oobfree[0][0];
1147 c->fsdata_len = oinfo->oobfree[0][1];
1148 if (c->fsdata_len > 8)
1151 /* This is just a legacy fallback and should go away soon */
1152 switch(c->mtd->ecctype) {
1153 case MTD_ECC_RS_DiskOnChip:
1154 printk(KERN_WARNING "JFFS2 using DiskOnChip hardware ECC without autoplacement. Fix it!\n");
1155 c->oobinfo = &jffs2_oobinfo_docecc;
1157 c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN;
1158 c->badblock_pos = 15;
1162 D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n"));
1169 int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
1173 /* Initialise write buffer */
1174 init_rwsem(&c->wbuf_sem);
1175 c->wbuf_pagesize = c->mtd->oobblock;
1176 c->wbuf_ofs = 0xFFFFFFFF;
1178 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1182 res = jffs2_nand_set_oobinfo(c);
1186 brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1191 memset(brokenbuf, 0xdb, c->wbuf_pagesize);
1196 void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
1201 int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
1202 c->cleanmarker_size = 0; /* No cleanmarkers needed */
1204 /* Initialize write buffer */
1205 init_rwsem(&c->wbuf_sem);
1206 c->wbuf_pagesize = c->sector_size;
1207 c->wbuf_ofs = 0xFFFFFFFF;
1209 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1213 printk(KERN_INFO "JFFS2 write-buffering enabled (%i)\n", c->wbuf_pagesize);
1218 void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
1222 int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) {
1223 /* Cleanmarker is actually larger on the flashes */
1224 c->cleanmarker_size = 16;
1226 /* Initialize write buffer */
1227 init_rwsem(&c->wbuf_sem);
1228 c->wbuf_pagesize = c->mtd->eccsize;
1229 c->wbuf_ofs = 0xFFFFFFFF;
1231 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1238 void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c) {
1242 int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
1243 /* Cleanmarker currently occupies a whole programming region */
1244 c->cleanmarker_size = MTD_PROGREGION_SIZE(c->mtd);
1246 /* Initialize write buffer */
1247 init_rwsem(&c->wbuf_sem);
1248 c->wbuf_pagesize = MTD_PROGREGION_SIZE(c->mtd);
1249 c->wbuf_ofs = 0xFFFFFFFF;
1251 c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
1258 void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {