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Subject[PATCH v2 14/17] drivers:mtd:ubi:add backup operation in ubi_io_write
Date
From: Bean Huo <beanhuo@micron.com>

This patch is to add backup lower page data codes in ubi_io_write.
If programming lower page, bakvol module will duplicate this lower page
data, then program to two different plane pages by multiple plane page program.

Signed-off-by: BeanHuo <beanhuo@micron.com>
---
drivers/mtd/ubi/io.c | 73 +++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 61 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 5bbd1f0..6905929 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -222,6 +222,7 @@ retry:
* @pnum: physical eraseblock number to write to
* @offset: offset within the physical eraseblock where to write
* @len: how many bytes to write
+ * @safeguard: if these data has to be duplicated to backup
*
* This function writes @len bytes of data from buffer @buf to offset @offset
* of physical eraseblock @pnum. If all the data were successfully written,
@@ -233,11 +234,12 @@ retry:
* to the flash media, but may be some garbage.
*/
int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
- int len)
+ int len, int safeguard)
{
int err;
- size_t written;
+ size_t retlen;
loff_t addr;
+ int skip;

dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset);

@@ -281,14 +283,61 @@ 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
+ skip = 0;
+ if (((offset == 0) && (len == ubi->peb_size)) ||
+ !safeguard)
+ skip = 1;
+
+ if (ubi_check_bakvol_module(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_duplicate_data_to_bakvol(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 %d 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);
@@ -438,7 +487,7 @@ static int torture_peb(struct ubi_device *ubi, int pnum)

/* Write a pattern and check it */
memset(ubi->peb_buf, patterns[i], ubi->peb_size);
- err = ubi_io_write(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size);
+ err = ubi_io_write(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size, 0);
if (err)
goto out;

@@ -862,7 +911,7 @@ int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
if (ubi_dbg_power_cut(ubi, POWER_CUT_EC_WRITE))
return -EROFS;

- err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize);
+ err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize, 0);
return err;
}

@@ -1114,7 +1163,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,

p = (char *)vid_hdr - ubi->vid_hdr_shift;
err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
- ubi->vid_hdr_alsize);
+ ubi->vid_hdr_alsize, 0);
return err;
}

--
1.9.1
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