linux-kernel - [PATCH 6/9] drivers:mtd:ubi:add hook for UBI bakvol in ubi_io

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Message-ID: <A765B125120D1346A63912DDE6D8B6310BF4CF13@NTXXIAMBX02.xacn.micron.com>
Date:	Mon, 28 Sep 2015 07:03:38 +0000
From:	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>
To:	"dedekind1@...il.com" <dedekind1@...il.com>,
	"adrian.hunter@...el.com" <adrian.hunter@...el.com>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>,
	"baruch@...s.co.il" <baruch@...s.co.il>,
	"asierra@...-inc.com" <asierra@...-inc.com>,
	"guz.fnst@...fujitsu.com" <guz.fnst@...fujitsu.com>,
	"gsi@...x.de" <gsi@...x.de>, "richard@....at" <richard@....at>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
CC:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Richard Weinberger <richard@....at>,
	Frank Liu 刘群 (frankliu) 
	<frankliu@...ron.com>, Andrea Scian <rnd4@...e-tech.it>,
	Peter Pan 潘栋 (peterpandong) 
	<peterpandong@...ron.com>,
	Karl Zhang 张双锣 (karlzhang) 
	<karlzhang@...ron.com>,
	Iwo Mergler <Iwo.Mergler@...commwireless.com>,
	"Jeff Lauruhn (jlauruhn)" <jlauruhn@...ron.com>,
	Stefan Roese <sr@...x.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 6/9] drivers:mtd:ubi:add hook for UBI bakvol in ubi_io_write

Add hook for UBI bakvol in ubi_io_write.

Modify ubi_io_write, if program lower page of MLC NAND,
Duplicated it and backup one copy into internal log volume by
Dual plane program method.

Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/mtd/ubi/io.c | 63 +++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 55 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 5bbd1f0..912c458 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -236,8 +236,9 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
 		 int len)
 {
 	int err;
-	size_t written;
+	size_t retlen;
 	loff_t addr;
+	int skip = 0;
 
 	dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset);
 
@@ -281,14 +282,60 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
 	}
 
 	addr = (loff_t)pnum * ubi->peb_size + offset;
-	err = mtd_write(ubi->mtd, addr, len, &written, buf);
-	if (err) {
-		ubi_err(ubi, "error %d while writing %d bytes to PEB %d:%d, written %zd bytes",
-			err, len, pnum, offset, written);
-		dump_stack();
-		ubi_dump_flash(ubi, pnum, offset, len);
+
+#ifdef CONFIG_MTD_UBI_MLC_NAND_BAKVOL
+	if ((offset == 0) && (len == ubi->peb_size))
+		skip = 1;
+
+	if (ubi_check_backup_volume(ubi) && (!skip)) {
+		loff_t addr_temp;
+		unsigned char *buf_temp = (unsigned char *)buf;
+		int len_temp;
+		int writelen = 0;
+
+		addr_temp = addr;
+
+		for (len_temp = len; len_temp > 0; len_temp -= ubi->min_io_size,
+			addr_temp += ubi->min_io_size,
+			buf_temp += ubi->min_io_size) {
+			/* Split data according to min_io_size */
+
+			if (len_temp/ubi->min_io_size)
+				writelen = ubi->min_io_size;
+			else
+				writelen %= ubi->min_io_size;
+
+			if (is_backup_need(ubi, addr_temp)) {
+				err = ubi_backup_data_to_backup_volume(ubi,
+					addr_temp, writelen, &retlen, buf_temp);
+				} else
+				err = mtd_write(ubi->mtd, addr_temp, writelen,
+						&retlen, buf_temp);
+
+			if (err) {
+				ubi_err(ubi, "Writing %d byptes to PEB %d:%d",
+					writelen, pnum, offset);
+				ubi_err(ubi, "Error %d", err);
+				ubi_err(ubi, "Written %zd bytes", retlen);
+				dump_stack();
+				ubi_dump_flash(ubi, pnum, offset, writelen);
+				} else
+				ubi_assert(retlen == writelen);
+		}
 	} else
-		ubi_assert(written == len);
+#endif
+	{
+		err = mtd_write(ubi->mtd, addr, len, &retlen, buf);
+		if (err) {
+			ubi_err(ubi, "Writing %d byptes to PEB %d:%d",
+				len, pnum, offset);
+			ubi_err(ubi, "Error %d", err);
+			ubi_err(ubi, "Written %zd bytes", retlen);
+			dump_stack();
+			ubi_dump_flash(ubi, pnum, offset, len);
+		} else
+			ubi_assert(retlen == len);
+	}
 
 	if (!err) {
 		err = self_check_write(ubi, buf, pnum, offset, len);
-- 
1.9.1