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ubifs: Recovery for cases of unclean reboot

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After power lost, spinand may work in a unkonw state and result in
bit flip, including:
1.Write to cache invalid and dirty cache data write to page's array
which result in node CRC error for some pages.
2.One page write fail but the next page write success result in
empty space corruption.

Change-Id: I212c237202b32de0217efc8dd5a4e84174953a3f
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
This commit is contained in:
Jon Lin 2021-01-30 14:56:21 +08:00 committed by Tao Huang
parent 91db0733d7
commit cc770c4e7a
1 changed files with 37 additions and 4 deletions
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41
fs/ubifs/recovery.c
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@ -662,10 +662,43 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
offs += ret;
buf += ret;
len -= ret;
} else if (ret == SCANNED_EMPTY_SPACE ||
ret == SCANNED_GARBAGE ||
ret == SCANNED_A_BAD_PAD_NODE ||
ret == SCANNED_A_CORRUPT_NODE) {
} else if (ret == SCANNED_A_CORRUPT_NODE) {
dbg_rcvry("found corruption (%d) at %d:%d",
ret, lnum, offs);
if (ubifs_check_node(c, buf, lnum, offs, 1, 1) == -EUCLEAN &&
!no_more_nodes(c, buf, len, lnum, offs)) {
int skip;
struct ubifs_ch *ch = buf;
/*
* If the flash voltage power down suddenly in the programming
* process, it may lead to abnormal data written by the flash
* in the low-voltage operation process, and the last data
* should be discarded.
*/
ubifs_msg(c, "recovery corrupt node\n");
skip = ALIGN(offs + le32_to_cpu(ch->len), c->max_write_size) - offs;
memset(buf + skip, 0xff, len - skip);
}
break;
} else if (ret == SCANNED_EMPTY_SPACE) {
dbg_rcvry("found corruption (%d) at %d:%d",
ret, lnum, offs);
if (!is_empty(buf, len) && !is_last_write(c, buf, offs)) {
/*
* If the flash voltage power down suddenly in the programming
* process, it may lead to the data was programmed to the wroge
* page written by the flash in the low-voltage operation process,
* and the data should be discarded.
*/
ubifs_msg(c, "recovery empty space\n");
memset(buf, 0xff, len);
}
break;
} else if (ret == SCANNED_GARBAGE ||
ret == SCANNED_A_BAD_PAD_NODE) {
dbg_rcvry("found corruption (%d) at %d:%d",
ret, lnum, offs);
break;