[JFFS2] add write verify on dataflash.

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=cca15841710da39490abc17f56b55703e3140955
Commit:     cca15841710da39490abc17f56b55703e3140955
Parent:     0bc88c59cc2f031a38ad5902d5764497549217c5
Author:     michael <trimarchi at gandalf.sssup.it>
AuthorDate: Fri Apr 18 13:44:17 2008 -0700
Committer:  David Woodhouse <dwmw2 at infradead.org>
CommitDate: Tue Apr 22 12:35:50 2008 +0100

    [JFFS2] add write verify on dataflash.
    
    Add the write verification buffer to the dataflash.  The mtd_dataflash has
    the CONFIG_DATAFLASH_WRITE_VERIFY so is better a change to Kconfig.
    
    Signed-off-by: Michael Trimarchi <trimarchimichael at yahoo.it>
    Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
    Signed-off-by: David Woodhouse <dwmw2 at infradead.org>
---
 fs/jffs2/wbuf.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index d1d4f27..ba49f19 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -1236,12 +1236,24 @@ int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
 	if (!c->wbuf)
 		return -ENOMEM;
 
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+	c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+	if (!c->wbuf_verify) {
+		kfree(c->oobbuf);
+		kfree(c->wbuf);
+		return -ENOMEM;
+	}
+#endif
+
 	printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size);
 
 	return 0;
 }
 
 void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+	kfree(c->wbuf_verify);
+#endif
 	kfree(c->wbuf);
 }