wbuf.c 35.3 KB
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/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001-2003 Red Hat, Inc.
 * Copyright (C) 2004 Thomas Gleixner <tglx@linutronix.de>
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 * Modified debugged and enhanced by Thomas Gleixner <tglx@linutronix.de>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
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 * $Id: wbuf.c,v 1.89 2005/02/09 09:23:54 pavlov Exp $
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 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/crc32.h>
#include <linux/mtd/nand.h>
#include "nodelist.h"

/* For testing write failures */
#undef BREAKME
#undef BREAKMEHEADER

#ifdef BREAKME
static unsigned char *brokenbuf;
#endif

/* max. erase failures before we mark a block bad */
#define MAX_ERASE_FAILURES 	2

/* two seconds timeout for timed wbuf-flushing */
#define WBUF_FLUSH_TIMEOUT	2 * HZ

struct jffs2_inodirty {
	uint32_t ino;
	struct jffs2_inodirty *next;
};

static struct jffs2_inodirty inodirty_nomem;

static int jffs2_wbuf_pending_for_ino(struct jffs2_sb_info *c, uint32_t ino)
{
	struct jffs2_inodirty *this = c->wbuf_inodes;

	/* If a malloc failed, consider _everything_ dirty */
	if (this == &inodirty_nomem)
		return 1;

	/* If ino == 0, _any_ non-GC writes mean 'yes' */
	if (this && !ino)
		return 1;

	/* Look to see if the inode in question is pending in the wbuf */
	while (this) {
		if (this->ino == ino)
			return 1;
		this = this->next;
	}
	return 0;
}

static void jffs2_clear_wbuf_ino_list(struct jffs2_sb_info *c)
{
	struct jffs2_inodirty *this;

	this = c->wbuf_inodes;

	if (this != &inodirty_nomem) {
		while (this) {
			struct jffs2_inodirty *next = this->next;
			kfree(this);
			this = next;
		}
	}
	c->wbuf_inodes = NULL;
}

static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino)
{
	struct jffs2_inodirty *new;

	/* Mark the superblock dirty so that kupdated will flush... */
	OFNI_BS_2SFFJ(c)->s_dirt = 1;

	if (jffs2_wbuf_pending_for_ino(c, ino))
		return;

	new = kmalloc(sizeof(*new), GFP_KERNEL);
	if (!new) {
		D1(printk(KERN_DEBUG "No memory to allocate inodirty. Fallback to all considered dirty\n"));
		jffs2_clear_wbuf_ino_list(c);
		c->wbuf_inodes = &inodirty_nomem;
		return;
	}
	new->ino = ino;
	new->next = c->wbuf_inodes;
	c->wbuf_inodes = new;
	return;
}

static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c)
{
	struct list_head *this, *next;
	static int n;

	if (list_empty(&c->erasable_pending_wbuf_list))
		return;

	list_for_each_safe(this, next, &c->erasable_pending_wbuf_list) {
		struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);

		D1(printk(KERN_DEBUG "Removing eraseblock at 0x%08x from erasable_pending_wbuf_list...\n", jeb->offset));
		list_del(this);
		if ((jiffies + (n++)) & 127) {
			/* Most of the time, we just erase it immediately. Otherwise we
			   spend ages scanning it on mount, etc. */
			D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n"));
			list_add_tail(&jeb->list, &c->erase_pending_list);
			c->nr_erasing_blocks++;
			jffs2_erase_pending_trigger(c);
		} else {
			/* Sometimes, however, we leave it elsewhere so it doesn't get
			   immediately reused, and we spread the load a bit. */
			D1(printk(KERN_DEBUG "...and adding to erasable_list\n"));
			list_add_tail(&jeb->list, &c->erasable_list);
		}
	}
}

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#define REFILE_NOTEMPTY 0
#define REFILE_ANYWAY   1

static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int allow_empty)
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{
	D1(printk("About to refile bad block at %08x\n", jeb->offset));

	D2(jffs2_dump_block_lists(c));
	/* File the existing block on the bad_used_list.... */
	if (c->nextblock == jeb)
		c->nextblock = NULL;
	else /* Not sure this should ever happen... need more coffee */
		list_del(&jeb->list);
	if (jeb->first_node) {
		D1(printk("Refiling block at %08x to bad_used_list\n", jeb->offset));
		list_add(&jeb->list, &c->bad_used_list);
	} else {
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		BUG_ON(allow_empty == REFILE_NOTEMPTY);
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		/* It has to have had some nodes or we couldn't be here */
		D1(printk("Refiling block at %08x to erase_pending_list\n", jeb->offset));
		list_add(&jeb->list, &c->erase_pending_list);
		c->nr_erasing_blocks++;
		jffs2_erase_pending_trigger(c);
	}
	D2(jffs2_dump_block_lists(c));

	/* Adjust its size counts accordingly */
	c->wasted_size += jeb->free_size;
	c->free_size -= jeb->free_size;
	jeb->wasted_size += jeb->free_size;
	jeb->free_size = 0;

	ACCT_SANITY_CHECK(c,jeb);
	D1(ACCT_PARANOIA_CHECK(jeb));
}

/* Recover from failure to write wbuf. Recover the nodes up to the
 * wbuf, not the one which we were starting to try to write. */

static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
{
	struct jffs2_eraseblock *jeb, *new_jeb;
	struct jffs2_raw_node_ref **first_raw, **raw;
	size_t retlen;
	int ret;
	unsigned char *buf;
	uint32_t start, end, ofs, len;

	spin_lock(&c->erase_completion_lock);

	jeb = &c->blocks[c->wbuf_ofs / c->sector_size];

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	jffs2_block_refile(c, jeb, REFILE_NOTEMPTY);
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	/* Find the first node to be recovered, by skipping over every
	   node which ends before the wbuf starts, or which is obsolete. */
	first_raw = &jeb->first_node;
	while (*first_raw && 
	       (ref_obsolete(*first_raw) ||
		(ref_offset(*first_raw)+ref_totlen(c, jeb, *first_raw)) < c->wbuf_ofs)) {
		D1(printk(KERN_DEBUG "Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n",
			  ref_offset(*first_raw), ref_flags(*first_raw),
			  (ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw)),
			  c->wbuf_ofs));
		first_raw = &(*first_raw)->next_phys;
	}

	if (!*first_raw) {
		/* All nodes were obsolete. Nothing to recover. */
		D1(printk(KERN_DEBUG "No non-obsolete nodes to be recovered. Just filing block bad\n"));
		spin_unlock(&c->erase_completion_lock);
		return;
	}

	start = ref_offset(*first_raw);
	end = ref_offset(*first_raw) + ref_totlen(c, jeb, *first_raw);

	/* Find the last node to be recovered */
	raw = first_raw;
	while ((*raw)) {
		if (!ref_obsolete(*raw))
			end = ref_offset(*raw) + ref_totlen(c, jeb, *raw);

		raw = &(*raw)->next_phys;
	}
	spin_unlock(&c->erase_completion_lock);

	D1(printk(KERN_DEBUG "wbuf recover %08x-%08x\n", start, end));

	buf = NULL;
	if (start < c->wbuf_ofs) {
		/* First affected node was already partially written.
		 * Attempt to reread the old data into our buffer. */

		buf = kmalloc(end - start, GFP_KERNEL);
		if (!buf) {
			printk(KERN_CRIT "Malloc failure in wbuf recovery. Data loss ensues.\n");

			goto read_failed;
		}

		/* Do the read... */
		if (jffs2_cleanmarker_oob(c))
			ret = c->mtd->read_ecc(c->mtd, start, c->wbuf_ofs - start, &retlen, buf, NULL, c->oobinfo);
		else
			ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf);
		
		if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) {
			/* ECC recovered */
			ret = 0;
		}
		if (ret || retlen != c->wbuf_ofs - start) {
			printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n");

			kfree(buf);
			buf = NULL;
		read_failed:
			first_raw = &(*first_raw)->next_phys;
			/* If this was the only node to be recovered, give up */
			if (!(*first_raw))
				return;

			/* It wasn't. Go on and try to recover nodes complete in the wbuf */
			start = ref_offset(*first_raw);
		} else {
			/* Read succeeded. Copy the remaining data from the wbuf */
			memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs);
		}
	}
	/* OK... we're to rewrite (end-start) bytes of data from first_raw onwards.
	   Either 'buf' contains the data, or we find it in the wbuf */


	/* ... and get an allocation of space from a shiny new block instead */
	ret = jffs2_reserve_space_gc(c, end-start, &ofs, &len);
	if (ret) {
		printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n");
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		kfree(buf);
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		return;
	}
	if (end-start >= c->wbuf_pagesize) {
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		/* Need to do another write immediately, but it's possible
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		   that this is just because the wbuf itself is completely
		   full, and there's nothing earlier read back from the 
		   flash. Hence 'buf' isn't necessarily what we're writing 
		   from. */
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		unsigned char *rewrite_buf = buf?:c->wbuf;
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		uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize);

		D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n",
			  towrite, ofs));
	  
#ifdef BREAKMEHEADER
		static int breakme;
		if (breakme++ == 20) {
			printk(KERN_NOTICE "Faking write error at 0x%08x\n", ofs);
			breakme = 0;
			c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen,
					  brokenbuf, NULL, c->oobinfo);
			ret = -EIO;
		} else
#endif
		if (jffs2_cleanmarker_oob(c))
			ret = c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen,
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						rewrite_buf, NULL, c->oobinfo);
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		else
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			ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, rewrite_buf);
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		if (ret || retlen != towrite) {
			/* Argh. We tried. Really we did. */
			printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n");
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			kfree(buf);
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			if (retlen) {
				struct jffs2_raw_node_ref *raw2;

				raw2 = jffs2_alloc_raw_node_ref();
				if (!raw2)
					return;

				raw2->flash_offset = ofs | REF_OBSOLETE;
				raw2->__totlen = ref_totlen(c, jeb, *first_raw);
				raw2->next_phys = NULL;
				raw2->next_in_ino = NULL;

				jffs2_add_physical_node_ref(c, raw2);
			}
			return;
		}
		printk(KERN_NOTICE "Recovery of wbuf succeeded to %08x\n", ofs);

		c->wbuf_len = (end - start) - towrite;
		c->wbuf_ofs = ofs + towrite;
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		memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len);
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		/* Don't muck about with c->wbuf_inodes. False positives are harmless. */
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		if (buf)
			kfree(buf);
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	} else {
		/* OK, now we're left with the dregs in whichever buffer we're using */
		if (buf) {
			memcpy(c->wbuf, buf, end-start);
			kfree(buf);
		} else {
			memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start);
		}
		c->wbuf_ofs = ofs;
		c->wbuf_len = end - start;
	}

	/* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */
	new_jeb = &c->blocks[ofs / c->sector_size];

	spin_lock(&c->erase_completion_lock);
	if (new_jeb->first_node) {
		/* Odd, but possible with ST flash later maybe */
		new_jeb->last_node->next_phys = *first_raw;
	} else {
		new_jeb->first_node = *first_raw;
	}

	raw = first_raw;
	while (*raw) {
		uint32_t rawlen = ref_totlen(c, jeb, *raw);

		D1(printk(KERN_DEBUG "Refiling block of %08x at %08x(%d) to %08x\n",
			  rawlen, ref_offset(*raw), ref_flags(*raw), ofs));

		if (ref_obsolete(*raw)) {
			/* Shouldn't really happen much */
			new_jeb->dirty_size += rawlen;
			new_jeb->free_size -= rawlen;
			c->dirty_size += rawlen;
		} else {
			new_jeb->used_size += rawlen;
			new_jeb->free_size -= rawlen;
			jeb->dirty_size += rawlen;
			jeb->used_size  -= rawlen;
			c->dirty_size += rawlen;
		}
		c->free_size -= rawlen;
		(*raw)->flash_offset = ofs | ref_flags(*raw);
		ofs += rawlen;
		new_jeb->last_node = *raw;

		raw = &(*raw)->next_phys;
	}

	/* Fix up the original jeb now it's on the bad_list */
	*first_raw = NULL;
	if (first_raw == &jeb->first_node) {
		jeb->last_node = NULL;
		D1(printk(KERN_DEBUG "Failing block at %08x is now empty. Moving to erase_pending_list\n", jeb->offset));
		list_del(&jeb->list);
		list_add(&jeb->list, &c->erase_pending_list);
		c->nr_erasing_blocks++;
		jffs2_erase_pending_trigger(c);
	}
	else
		jeb->last_node = container_of(first_raw, struct jffs2_raw_node_ref, next_phys);

	ACCT_SANITY_CHECK(c,jeb);
        D1(ACCT_PARANOIA_CHECK(jeb));

	ACCT_SANITY_CHECK(c,new_jeb);
        D1(ACCT_PARANOIA_CHECK(new_jeb));

	spin_unlock(&c->erase_completion_lock);

	D1(printk(KERN_DEBUG "wbuf recovery completed OK\n"));
}

/* Meaning of pad argument:
   0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway.
   1: Pad, do not adjust nextblock free_size
   2: Pad, adjust nextblock free_size
*/
#define NOPAD		0
#define PAD_NOACCOUNT	1
#define PAD_ACCOUNTING	2

static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
{
	int ret;
	size_t retlen;

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	/* Nothing to do if not write-buffering the flash. In particular, we shouldn't
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	   del_timer() the timer we never initialised. */
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	if (!jffs2_is_writebuffered(c))
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		return 0;

	if (!down_trylock(&c->alloc_sem)) {
		up(&c->alloc_sem);
		printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n");
		BUG();
	}

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	if (!c->wbuf_len)	/* already checked c->wbuf above */
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		return 0;

	/* claim remaining space on the page
	   this happens, if we have a change to a new block,
	   or if fsync forces us to flush the writebuffer.
	   if we have a switch to next page, we will not have
	   enough remaining space for this. 
	*/
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	if (pad && !jffs2_dataflash(c)) {
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		c->wbuf_len = PAD(c->wbuf_len);

		/* Pad with JFFS2_DIRTY_BITMASK initially.  this helps out ECC'd NOR
		   with 8 byte page size */
		memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len);
		
		if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) {
			struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len);
			padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
			padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING);
			padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len);
			padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4));
		}
	}
	/* else jffs2_flash_writev has actually filled in the rest of the
	   buffer for us, and will deal with the node refs etc. later. */
	
#ifdef BREAKME
	static int breakme;
	if (breakme++ == 20) {
		printk(KERN_NOTICE "Faking write error at 0x%08x\n", c->wbuf_ofs);
		breakme = 0;
		c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize,
					&retlen, brokenbuf, NULL, c->oobinfo);
		ret = -EIO;
	} else 
#endif
	
	if (jffs2_cleanmarker_oob(c))
		ret = c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf, NULL, c->oobinfo);
	else
		ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf);

	if (ret || retlen != c->wbuf_pagesize) {
		if (ret)
			printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret);
		else {
			printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n",
				retlen, c->wbuf_pagesize);
			ret = -EIO;
		}

		jffs2_wbuf_recover(c);

		return ret;
	}

	spin_lock(&c->erase_completion_lock);

	/* Adjust free size of the block if we padded. */
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	if (pad && !jffs2_dataflash(c)) {
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		struct jffs2_eraseblock *jeb;

		jeb = &c->blocks[c->wbuf_ofs / c->sector_size];

		D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n",
			  (jeb==c->nextblock)?"next":"", jeb->offset));

		/* wbuf_pagesize - wbuf_len is the amount of space that's to be 
		   padded. If there is less free space in the block than that,
		   something screwed up */
		if (jeb->free_size < (c->wbuf_pagesize - c->wbuf_len)) {
			printk(KERN_CRIT "jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n",
			       c->wbuf_ofs, c->wbuf_len, c->wbuf_pagesize-c->wbuf_len);
			printk(KERN_CRIT "jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n",
			       jeb->offset, jeb->free_size);
			BUG();
		}
		jeb->free_size -= (c->wbuf_pagesize - c->wbuf_len);
		c->free_size -= (c->wbuf_pagesize - c->wbuf_len);
		jeb->wasted_size += (c->wbuf_pagesize - c->wbuf_len);
		c->wasted_size += (c->wbuf_pagesize - c->wbuf_len);
	}

	/* Stick any now-obsoleted blocks on the erase_pending_list */
	jffs2_refile_wbuf_blocks(c);
	jffs2_clear_wbuf_ino_list(c);
	spin_unlock(&c->erase_completion_lock);

	memset(c->wbuf,0xff,c->wbuf_pagesize);
	/* adjust write buffer offset, else we get a non contiguous write bug */
	c->wbuf_ofs += c->wbuf_pagesize;
	c->wbuf_len = 0;
	return 0;
}

/* Trigger garbage collection to flush the write-buffer. 
   If ino arg is zero, do it if _any_ real (i.e. not GC) writes are
   outstanding. If ino arg non-zero, do it only if a write for the 
   given inode is outstanding. */
int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino)
{
	uint32_t old_wbuf_ofs;
	uint32_t old_wbuf_len;
	int ret = 0;

	D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino));

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	if (!c->wbuf)
		return 0;

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	down(&c->alloc_sem);
	if (!jffs2_wbuf_pending_for_ino(c, ino)) {
		D1(printk(KERN_DEBUG "Ino #%d not pending in wbuf. Returning\n", ino));
		up(&c->alloc_sem);
		return 0;
	}

	old_wbuf_ofs = c->wbuf_ofs;
	old_wbuf_len = c->wbuf_len;

	if (c->unchecked_size) {
		/* GC won't make any progress for a while */
		D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() padding. Not finished checking\n"));
		down_write(&c->wbuf_sem);
		ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
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		/* retry flushing wbuf in case jffs2_wbuf_recover
		   left some data in the wbuf */
		if (ret)
			ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
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		up_write(&c->wbuf_sem);
	} else while (old_wbuf_len &&
		      old_wbuf_ofs == c->wbuf_ofs) {

		up(&c->alloc_sem);

		D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() calls gc pass\n"));

		ret = jffs2_garbage_collect_pass(c);
		if (ret) {
			/* GC failed. Flush it with padding instead */
			down(&c->alloc_sem);
			down_write(&c->wbuf_sem);
			ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
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			/* retry flushing wbuf in case jffs2_wbuf_recover
			   left some data in the wbuf */
			if (ret)
				ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
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			up_write(&c->wbuf_sem);
			break;
		}
		down(&c->alloc_sem);
	}

	D1(printk(KERN_DEBUG "jffs2_flush_wbuf_gc() ends...\n"));

	up(&c->alloc_sem);
	return ret;
}

/* Pad write-buffer to end and write it, wasting space. */
int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
{
	int ret;

594 595 596
	if (!c->wbuf)
		return 0;

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	down_write(&c->wbuf_sem);
	ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
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	/* retry - maybe wbuf recover left some data in wbuf. */
	if (ret)
		ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
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	up_write(&c->wbuf_sem);

	return ret;
}

607
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
608 609 610
#define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
#define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
#else
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#define PAGE_DIV(x) ( (x) & (~(c->wbuf_pagesize - 1)) )
#define PAGE_MOD(x) ( (x) & (c->wbuf_pagesize - 1) )
613 614
#endif

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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)
{
	struct kvec outvecs[3];
	uint32_t totlen = 0;
	uint32_t split_ofs = 0;
	uint32_t old_totlen;
	int ret, splitvec = -1;
	int invec, outvec;
	size_t wbuf_retlen;
	unsigned char *wbuf_ptr;
	size_t donelen = 0;
	uint32_t outvec_to = to;

	/* If not NAND flash, don't bother */
629
	if (!jffs2_is_writebuffered(c))
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		return jffs2_flash_direct_writev(c, invecs, count, to, retlen);
	
	down_write(&c->wbuf_sem);

	/* If wbuf_ofs is not initialized, set it to target address */
	if (c->wbuf_ofs == 0xFFFFFFFF) {
		c->wbuf_ofs = PAGE_DIV(to);
		c->wbuf_len = PAGE_MOD(to);			
		memset(c->wbuf,0xff,c->wbuf_pagesize);
	}

	/* Fixup the wbuf if we are moving to a new eraseblock.  The checks below
	   fail for ECC'd NOR because cleanmarker == 16, so a block starts at
	   xxx0010.  */
	if (jffs2_nor_ecc(c)) {
		if (((c->wbuf_ofs % c->sector_size) == 0) && !c->wbuf_len) {
			c->wbuf_ofs = PAGE_DIV(to);
			c->wbuf_len = PAGE_MOD(to);
			memset(c->wbuf,0xff,c->wbuf_pagesize);
		}
	}
	
	/* Sanity checks on target address. 
	   It's permitted to write at PAD(c->wbuf_len+c->wbuf_ofs), 
	   and it's permitted to write at the beginning of a new 
	   erase block. Anything else, and you die.
	   New block starts at xxx000c (0-b = block header)
	*/
658
	if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) {
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		/* It's a write to a new block */
		if (c->wbuf_len) {
			D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx causes flush of wbuf at 0x%08x\n", (unsigned long)to, c->wbuf_ofs));
			ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
			if (ret) {
				/* the underlying layer has to check wbuf_len to do the cleanup */
				D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret));
				*retlen = 0;
				goto exit;
			}
		}
		/* set pointer to new block */
		c->wbuf_ofs = PAGE_DIV(to);
		c->wbuf_len = PAGE_MOD(to);			
	} 

	if (to != PAD(c->wbuf_ofs + c->wbuf_len)) {
		/* We're not writing immediately after the writebuffer. Bad. */
		printk(KERN_CRIT "jffs2_flash_writev(): Non-contiguous write to %08lx\n", (unsigned long)to);
		if (c->wbuf_len)
			printk(KERN_CRIT "wbuf was previously %08x-%08x\n",
					  c->wbuf_ofs, c->wbuf_ofs+c->wbuf_len);
		BUG();
	}

	/* Note outvecs[3] above. We know count is never greater than 2 */
	if (count > 2) {
		printk(KERN_CRIT "jffs2_flash_writev(): count is %ld\n", count);
		BUG();
	}

	invec = 0;
	outvec = 0;

	/* Fill writebuffer first, if already in use */	
	if (c->wbuf_len) {
		uint32_t invec_ofs = 0;

		/* adjust alignment offset */ 
		if (c->wbuf_len != PAGE_MOD(to)) {
			c->wbuf_len = PAGE_MOD(to);
			/* take care of alignment to next page */
			if (!c->wbuf_len)
				c->wbuf_len = c->wbuf_pagesize;
		}
		
		while(c->wbuf_len < c->wbuf_pagesize) {
			uint32_t thislen;
			
			if (invec == count)
				goto alldone;

			thislen = c->wbuf_pagesize - c->wbuf_len;

			if (thislen >= invecs[invec].iov_len)
				thislen = invecs[invec].iov_len;
	
			invec_ofs = thislen;

			memcpy(c->wbuf + c->wbuf_len, invecs[invec].iov_base, thislen);
			c->wbuf_len += thislen;
			donelen += thislen;
			/* Get next invec, if actual did not fill the buffer */
			if (c->wbuf_len < c->wbuf_pagesize) 
				invec++;
		}			
		
		/* write buffer is full, flush buffer */
		ret = __jffs2_flush_wbuf(c, NOPAD);
		if (ret) {
			/* the underlying layer has to check wbuf_len to do the cleanup */
			D1(printk(KERN_WARNING "jffs2_flush_wbuf() called from jffs2_flash_writev() failed %d\n", ret));
			/* Retlen zero to make sure our caller doesn't mark the space dirty.
			   We've already done everything that's necessary */
			*retlen = 0;
			goto exit;
		}
		outvec_to += donelen;
		c->wbuf_ofs = outvec_to;

		/* All invecs done ? */
		if (invec == count)
			goto alldone;

		/* Set up the first outvec, containing the remainder of the
		   invec we partially used */
		if (invecs[invec].iov_len > invec_ofs) {
			outvecs[0].iov_base = invecs[invec].iov_base+invec_ofs;
			totlen = outvecs[0].iov_len = invecs[invec].iov_len-invec_ofs;
			if (totlen > c->wbuf_pagesize) {
				splitvec = outvec;
				split_ofs = outvecs[0].iov_len - PAGE_MOD(totlen);
			}
			outvec++;
		}
		invec++;
	}

	/* OK, now we've flushed the wbuf and the start of the bits
	   we have been asked to write, now to write the rest.... */

	/* totlen holds the amount of data still to be written */
	old_totlen = totlen;
	for ( ; invec < count; invec++,outvec++ ) {
		outvecs[outvec].iov_base = invecs[invec].iov_base;
		totlen += outvecs[outvec].iov_len = invecs[invec].iov_len;
		if (PAGE_DIV(totlen) != PAGE_DIV(old_totlen)) {
			splitvec = outvec;
			split_ofs = outvecs[outvec].iov_len - PAGE_MOD(totlen);
			old_totlen = totlen;
		}
	}

	/* Now the outvecs array holds all the remaining data to write */
	/* Up to splitvec,split_ofs is to be written immediately. The rest
	   goes into the (now-empty) wbuf */

	if (splitvec != -1) {
		uint32_t remainder;

		remainder = outvecs[splitvec].iov_len - split_ofs;
		outvecs[splitvec].iov_len = split_ofs;

		/* We did cross a page boundary, so we write some now */
		if (jffs2_cleanmarker_oob(c))
			ret = c->mtd->writev_ecc(c->mtd, outvecs, splitvec+1, outvec_to, &wbuf_retlen, NULL, c->oobinfo); 
		else
			ret = jffs2_flash_direct_writev(c, outvecs, splitvec+1, outvec_to, &wbuf_retlen);
		
		if (ret < 0 || wbuf_retlen != PAGE_DIV(totlen)) {
			/* At this point we have no problem,
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			   c->wbuf is empty. However refile nextblock to avoid
			   writing again to same address.
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			*/
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			struct jffs2_eraseblock *jeb;

			spin_lock(&c->erase_completion_lock);

			jeb = &c->blocks[outvec_to / c->sector_size];
			jffs2_block_refile(c, jeb, REFILE_ANYWAY);

			*retlen = 0;
			spin_unlock(&c->erase_completion_lock);
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			goto exit;
		}
		
		donelen += wbuf_retlen;
		c->wbuf_ofs = PAGE_DIV(outvec_to) + PAGE_DIV(totlen);

		if (remainder) {
			outvecs[splitvec].iov_base += split_ofs;
			outvecs[splitvec].iov_len = remainder;
		} else {
			splitvec++;
		}

	} else {
		splitvec = 0;
	}

	/* Now splitvec points to the start of the bits we have to copy
	   into the wbuf */
	wbuf_ptr = c->wbuf;

	for ( ; splitvec < outvec; splitvec++) {
		/* Don't copy the wbuf into itself */
		if (outvecs[splitvec].iov_base == c->wbuf)
			continue;
		memcpy(wbuf_ptr, outvecs[splitvec].iov_base, outvecs[splitvec].iov_len);
		wbuf_ptr += outvecs[splitvec].iov_len;
		donelen += outvecs[splitvec].iov_len;
	}
	c->wbuf_len = wbuf_ptr - c->wbuf;

	/* If there's a remainder in the wbuf and it's a non-GC write,
	   remember that the wbuf affects this ino */
alldone:
	*retlen = donelen;

	if (c->wbuf_len && ino)
		jffs2_wbuf_dirties_inode(c, ino);

	ret = 0;
	
exit:
	up_write(&c->wbuf_sem);
	return ret;
}

/*
 *	This is the entry for flash write.
 *	Check, if we work on NAND FLASH, if so build an kvec and write it via vritev
*/
int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, const u_char *buf)
{
	struct kvec vecs[1];

856
	if (!jffs2_is_writebuffered(c))
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		return c->mtd->write(c->mtd, ofs, len, retlen, buf);

	vecs[0].iov_base = (unsigned char *) buf;
	vecs[0].iov_len = len;
	return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0);
}

/*
	Handle readback from writebuffer and ECC failure return
*/
int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf)
{
	loff_t	orbf = 0, owbf = 0, lwbf = 0;
	int	ret;

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	if (!jffs2_is_writebuffered(c))
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		return c->mtd->read(c->mtd, ofs, len, retlen, buf);

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	/* Read flash */
	if (jffs2_cleanmarker_oob(c))
		ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo);
	else
		ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);

	if ( (ret == -EBADMSG) && (*retlen == len) ) {
		printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n",
		       len, ofs);
		/* 
		 * We have the raw data without ECC correction in the buffer, maybe 
		 * we are lucky and all data or parts are correct. We check the node.
		 * If data are corrupted node check will sort it out.
		 * We keep this block, it will fail on write or erase and the we
		 * mark it bad. Or should we do that now? But we should give him a chance.
		 * Maybe we had a system crash or power loss before the ecc write or  
		 * a erase was completed.
		 * So we return success. :)
		 */
	 	ret = 0;
	}	

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	/* if no writebuffer available or write buffer empty, return */
	if (!c->wbuf_pagesize || !c->wbuf_len)
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		return ret;;
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	/* if we read in a different block, return */
902
	if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs))
903 904 905 906 907 908
		return ret;

	/* Lock only if we have reason to believe wbuf contains relevant data,
	   so that checking an erased block during wbuf recovery space allocation
	   does not deadlock. */
	down_read(&c->wbuf_sem);
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	if (ofs >= c->wbuf_ofs) {
		owbf = (ofs - c->wbuf_ofs);	/* offset in write buffer */
		if (owbf > c->wbuf_len)		/* is read beyond write buffer ? */
			goto exit;
		lwbf = c->wbuf_len - owbf;	/* number of bytes to copy */
		if (lwbf > len)	
			lwbf = len;
	} else {	
		orbf = (c->wbuf_ofs - ofs);	/* offset in read buffer */
		if (orbf > len)			/* is write beyond write buffer ? */
			goto exit;
		lwbf = len - orbf; 		/* number of bytes to copy */
		if (lwbf > c->wbuf_len)	
			lwbf = c->wbuf_len;
	}	
	if (lwbf > 0)
		memcpy(buf+orbf,c->wbuf+owbf,lwbf);

exit:
	up_read(&c->wbuf_sem);
	return ret;
}

/*
 *	Check, if the out of band area is empty
 */
int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int mode)
{
	unsigned char *buf;
	int 	ret = 0;
	int	i,len,page;
	size_t  retlen;
	int	oob_size;

	/* allocate a buffer for all oob data in this sector */
	oob_size = c->mtd->oobsize;
	len = 4 * oob_size;
	buf = kmalloc(len, GFP_KERNEL);
	if (!buf) {
		printk(KERN_NOTICE "jffs2_check_oob_empty(): allocation of temporary data buffer for oob check failed\n");
		return -ENOMEM;
	}
	/* 
	 * if mode = 0, we scan for a total empty oob area, else we have
	 * to take care of the cleanmarker in the first page of the block
	*/
	ret = jffs2_flash_read_oob(c, jeb->offset, len , &retlen, buf);
	if (ret) {
		D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB failed %d for block at %08x\n", ret, jeb->offset));
		goto out;
	}
	
	if (retlen < len) {
		D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB return short read "
			  "(%zd bytes not %d) for block at %08x\n", retlen, len, jeb->offset));
		ret = -EIO;
		goto out;
	}
	
	/* Special check for first page */
	for(i = 0; i < oob_size ; i++) {
		/* Yeah, we know about the cleanmarker. */
		if (mode && i >= c->fsdata_pos && 
		    i < c->fsdata_pos + c->fsdata_len)
			continue;

		if (buf[i] != 0xFF) {
			D2(printk(KERN_DEBUG "Found %02x at %x in OOB for %08x\n",
				  buf[page+i], page+i, jeb->offset));
			ret = 1; 
			goto out;
		}
	}

	/* we know, we are aligned :) */	
	for (page = oob_size; page < len; page += sizeof(long)) {
		unsigned long dat = *(unsigned long *)(&buf[page]);
		if(dat != -1) {
			ret = 1; 
			goto out;
		}
	}

out:
	kfree(buf);	
	
	return ret;
}

/*
*	Scan for a valid cleanmarker and for bad blocks
*	For virtual blocks (concatenated physical blocks) check the cleanmarker
*	only in the first page of the first physical block, but scan for bad blocks in all
*	physical blocks
*/
int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
	struct jffs2_unknown_node n;
	unsigned char buf[2 * NAND_MAX_OOBSIZE];
	unsigned char *p;
	int ret, i, cnt, retval = 0;
	size_t retlen, offset;
	int oob_size;

	offset = jeb->offset;
	oob_size = c->mtd->oobsize;

	/* Loop through the physical blocks */
	for (cnt = 0; cnt < (c->sector_size / c->mtd->erasesize); cnt++) {
		/* Check first if the block is bad. */
		if (c->mtd->block_isbad (c->mtd, offset)) {
			D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Bad block at %08x\n", jeb->offset));
			return 2;
		}
		/*
		   *    We read oob data from page 0 and 1 of the block.
		   *    page 0 contains cleanmarker and badblock info
		   *    page 1 contains failure count of this block
		 */
		ret = c->mtd->read_oob (c->mtd, offset, oob_size << 1, &retlen, buf);

		if (ret) {
			D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): Read OOB failed %d for block at %08x\n", ret, jeb->offset));
			return ret;
		}
		if (retlen < (oob_size << 1)) {
			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));
			return -EIO;
		}

		/* Check cleanmarker only on the first physical block */
		if (!cnt) {
			n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
			n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
			n.totlen = cpu_to_je32 (8);
			p = (unsigned char *) &n;

			for (i = 0; i < c->fsdata_len; i++) {
				if (buf[c->fsdata_pos + i] != p[i]) {
					retval = 1;
				}
			}
			D1(if (retval == 1) {
				printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): Cleanmarker node not detected in block at %08x\n", jeb->offset);
				printk(KERN_WARNING "OOB at %08x was ", offset);
				for (i=0; i < oob_size; i++) {
					printk("%02x ", buf[i]);
				}
				printk("\n");
			})
		}
		offset += c->mtd->erasesize;
	}
	return retval;
}

int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
	struct 	jffs2_unknown_node n;
	int 	ret;
	size_t 	retlen;

	n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER);
	n.totlen = cpu_to_je32(8);

	ret = jffs2_flash_write_oob(c, jeb->offset + c->fsdata_pos, c->fsdata_len, &retlen, (unsigned char *)&n);
	
	if (ret) {
		D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
		return ret;
	}
	if (retlen != c->fsdata_len) {
		D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Short write for block at %08x: %zd not %d\n", jeb->offset, retlen, c->fsdata_len));
		return ret;
	}
	return 0;
}

/* 
 * On NAND we try to mark this block bad. If the block was erased more
 * than MAX_ERASE_FAILURES we mark it finaly bad.
 * Don't care about failures. This block remains on the erase-pending
 * or badblock list as long as nobody manipulates the flash with
 * a bootloader or something like that.
 */

int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
{
	int 	ret;

	/* if the count is < max, we try to write the counter to the 2nd page oob area */
	if( ++jeb->bad_count < MAX_ERASE_FAILURES)
		return 0;

	if (!c->mtd->block_markbad)
		return 1; // What else can we do?

	D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset));
	ret = c->mtd->block_markbad(c->mtd, bad_offset);
	
	if (ret) {
		D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
		return ret;
	}
	return 1;
}

#define NAND_JFFS2_OOB16_FSDALEN	8

static struct nand_oobinfo jffs2_oobinfo_docecc = {
	.useecc = MTD_NANDECC_PLACE,
	.eccbytes = 6,
	.eccpos = {0,1,2,3,4,5}
};


static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
{
	struct nand_oobinfo *oinfo = &c->mtd->oobinfo;

	/* Do this only, if we have an oob buffer */
	if (!c->mtd->oobsize)
		return 0;
	
	/* Cleanmarker is out-of-band, so inline size zero */
	c->cleanmarker_size = 0;

	/* Should we use autoplacement ? */
	if (oinfo && oinfo->useecc == MTD_NANDECC_AUTOPLACE) {
		D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n"));
		/* Get the position of the free bytes */
		if (!oinfo->oobfree[0][1]) {
			printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep. Autoplacement selected and no empty space in oob\n");
			return -ENOSPC;
		}
		c->fsdata_pos = oinfo->oobfree[0][0];
		c->fsdata_len = oinfo->oobfree[0][1];
		if (c->fsdata_len > 8)
			c->fsdata_len = 8;
	} else {
		/* This is just a legacy fallback and should go away soon */
		switch(c->mtd->ecctype) {
		case MTD_ECC_RS_DiskOnChip:
			printk(KERN_WARNING "JFFS2 using DiskOnChip hardware ECC without autoplacement. Fix it!\n");
			c->oobinfo = &jffs2_oobinfo_docecc;
			c->fsdata_pos = 6;
			c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN;
			c->badblock_pos = 15;
			break;
	
		default:
			D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n"));
			return -EINVAL;
		}
	}
	return 0;
}

int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
{
	int res;

	/* Initialise write buffer */
	init_rwsem(&c->wbuf_sem);
	c->wbuf_pagesize = c->mtd->oobblock;
	c->wbuf_ofs = 0xFFFFFFFF;
	
	c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
	if (!c->wbuf)
		return -ENOMEM;

	res = jffs2_nand_set_oobinfo(c);

#ifdef BREAKME
	if (!brokenbuf)
		brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
	if (!brokenbuf) {
		kfree(c->wbuf);
		return -ENOMEM;
	}
	memset(brokenbuf, 0xdb, c->wbuf_pagesize);
#endif
	return res;
}

void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
{
	kfree(c->wbuf);
}

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int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
	c->cleanmarker_size = 0;		/* No cleanmarkers needed */
	
	/* Initialize write buffer */
	init_rwsem(&c->wbuf_sem);
	c->wbuf_pagesize = c->sector_size;
	c->wbuf_ofs = 0xFFFFFFFF;

	c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
	if (!c->wbuf)
		return -ENOMEM;

	printk(KERN_INFO "JFFS2 write-buffering enabled (%i)\n", c->wbuf_pagesize);

	return 0;
}

void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
	kfree(c->wbuf);
}

L
Linus Torvalds 已提交
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int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) {
	/* Cleanmarker is actually larger on the flashes */
	c->cleanmarker_size = 16;

	/* Initialize write buffer */
	init_rwsem(&c->wbuf_sem);
	c->wbuf_pagesize = c->mtd->eccsize;
	c->wbuf_ofs = 0xFFFFFFFF;

	c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
	if (!c->wbuf)
		return -ENOMEM;

	return 0;
}

void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c) {
	kfree(c->wbuf);
}