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Subject[PATCH 6/9] drivers:mtd:ubi:add hook for UBI bakvol in ubi_io_write
Date
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@micron.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
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