JFFS2: add UBI support

This patch make JFFS2 able to work with UBI volumes via the emulated MTD
devices which are directly mapped to these volumes.

Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 4fac6dd..ab86031 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -1208,3 +1208,27 @@ int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
 void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {
 	kfree(c->wbuf);
 }
+
+int jffs2_ubivol_setup(struct jffs2_sb_info *c) {
+	c->cleanmarker_size = 0;
+
+	if (c->mtd->writesize == 1)
+		/* We do not need write-buffer */
+		return 0;
+
+	init_rwsem(&c->wbuf_sem);
+
+	c->wbuf_pagesize =  c->mtd->writesize;
+	c->wbuf_ofs = 0xFFFFFFFF;
+	c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+	if (!c->wbuf)
+		return -ENOMEM;
+
+	printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size);
+
+	return 0;
+}
+
+void jffs2_ubivol_cleanup(struct jffs2_sb_info *c) {
+	kfree(c->wbuf);
+}