[JFFS2] Write buffer offset adjustment for NOR-ECC (Sibley) flash

After choosing new c->nextblock, don't leave the wbuf offset field
occasionally pointing at the start of the next physical eraseblock.
This was causing a BUG() on NOR-ECC (Sibley) flash, where we start
writing after the cleanmarker.

Among other this fix should cover write buffer offset adjustment
after flushing the last page of an eraseblock.

Signed-off-by: Alexander Belyakov <abelyako@googlemail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index a9bf960..0875b60 100644 (file)
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -261,6 +261,10 @@ static int jffs2_find_nextblock(struct jffs2_sb_info *c)
 
        jffs2_sum_reset_collected(c->summary); /* reset collected summary */
 
+       /* adjust write buffer offset, else we get a non contiguous write bug */
+       if (!(c->wbuf_ofs % c->sector_size) && !c->wbuf_len)
+               c->wbuf_ofs = 0xffffffff;
+
        D1(printk(KERN_DEBUG "jffs2_find_nextblock(): new nextblock = 0x%08x\n", c->nextblock->offset));
 
        return 0;

diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 0e78b00..d9a721e 100644 (file)
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -679,10 +679,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
 
        memset(c->wbuf,0xff,c->wbuf_pagesize);
        /* adjust write buffer offset, else we get a non contiguous write bug */
-       if (SECTOR_ADDR(c->wbuf_ofs) == SECTOR_ADDR(c->wbuf_ofs+c->wbuf_pagesize))
-               c->wbuf_ofs += c->wbuf_pagesize;
-       else
-               c->wbuf_ofs = 0xffffffff;
+       c->wbuf_ofs += c->wbuf_pagesize;
        c->wbuf_len = 0;
        return 0;
 }