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Commit 7f716cf3 authored by Estelle Hammache's avatar Estelle Hammache Committed by Thomas Gleixner
Browse files

[JFFS2] Fix block refiling 



- block refiling when writing directly to flash a buffer
which is bigger than wbuf
- retry cases for flushing wbuf

Signed-off-by: default avatarEstelle Hammache <estelle.hammache@st.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent e4803c30

fs/jffs2/wbuf.c

+47 −18
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ 
 *

 * For licensing information, see the file 'LICENCE' in this directory.

 *

 * $Id: wbuf.c,v 1.82 2004/11/20 22:08:31 dwmw2 Exp $

 * $Id: wbuf.c,v 1.83 2005/01/24 21:24:15 hammache Exp $

 *

 */
@@ -130,7 +130,10 @@ static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c) 
	}

}



static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)

#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)

{

	D1(printk("About to refile bad block at %08x\n", jeb->offset));
@@ -144,6 +147,7 @@ static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock 
		D1(printk("Refiling block at %08x to bad_used_list\n", jeb->offset));

		list_add(&jeb->list, &c->bad_used_list);

	} else {

		if (allow_empty == REFILE_NOTEMPTY)

			BUG();

		/* 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));
@@ -179,7 +183,7 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c) 


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



	jffs2_block_refile(c, jeb);

	jffs2_block_refile(c, jeb, REFILE_NOTEMPTY);



	/* Find the first node to be recovered, by skipping over every

	   node which ends before the wbuf starts, or which is obsolete. */
@@ -269,12 +273,12 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c) 
		return;

	}

	if (end-start >= c->wbuf_pagesize) {

		/* Need to do another write immediately. This, btw,

		 means that we'll be writing from 'buf' and not from

		 the wbuf. Since if we're writing from the wbuf there

		 won't be more than a wbuf full of data, now will

		 there? :) */



		/* Need to do another write immediately, but it's possible

		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. */

		unsigned char *rewrite_buf = buf?:c->wbuf;

		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",
@@ -292,13 +296,14 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c) 
#endif

		if (jffs2_cleanmarker_oob(c))

			ret = c->mtd->write_ecc(c->mtd, ofs, towrite, &retlen,

						buf, NULL, c->oobinfo);

						rewrite_buf, NULL, c->oobinfo);

		else

			ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, buf);

			ret = c->mtd->write(c->mtd, ofs, towrite, &retlen, rewrite_buf);



		if (ret || retlen != towrite) {

			/* Argh. We tried. Really we did. */

			printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n");

			if (buf)

				kfree(buf);



			if (retlen) {
@@ -321,9 +326,9 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c) 


		c->wbuf_len = (end - start) - towrite;

		c->wbuf_ofs = ofs + towrite;

		memcpy(c->wbuf, buf + towrite, c->wbuf_len);

		memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len);

		/* Don't muck about with c->wbuf_inodes. False positives are harmless. */



		if (buf)

			kfree(buf);

	} else {

		/* OK, now we're left with the dregs in whichever buffer we're using */
@@ -547,6 +552,12 @@ int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino) 
		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);

		/* retry flushing wbuf in case jffs2_wbuf_recover

		   left some data in the wbuf */

		if (ret)

		{

			ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);

		}

		up_write(&c->wbuf_sem);

	} else while (old_wbuf_len &&

		      old_wbuf_ofs == c->wbuf_ofs) {
@@ -561,6 +572,12 @@ int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino) 
			down(&c->alloc_sem);

			down_write(&c->wbuf_sem);

			ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);

			/* retry flushing wbuf in case jffs2_wbuf_recover

			   left some data in the wbuf */

			if (ret)

			{

				ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);

			}

			up_write(&c->wbuf_sem);

			break;

		}
@@ -580,6 +597,9 @@ int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c) 


	down_write(&c->wbuf_sem);

	ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);

	/* retry - maybe wbuf recover left some data in wbuf. */

	if (ret)

		ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);

	up_write(&c->wbuf_sem);



	return ret;
@@ -762,9 +782,18 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig 
		

		if (ret < 0 || wbuf_retlen != PAGE_DIV(totlen)) {

			/* At this point we have no problem,

			   c->wbuf is empty. 

			   c->wbuf is empty. However refile nextblock to avoid

			   writing again to same address.

			*/

			*retlen = donelen;

			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);

			goto exit;

		}