lkml.org 
[lkml]   [2018]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/3] ubi: fastmap: Detect EBA mismatches on-the-fly
Date
Now we have the machinery to detect EBA mismatches on-the-fly
by comparing the in-memory volume ID and LEB number with the found
VID header.
This helps to detect malfunction of Fastmap.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
drivers/mtd/ubi/eba.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 1ceab201a27b..edb1c8362faa 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -513,6 +513,7 @@ static int check_mapping(struct ubi_device *ubi, struct ubi_volume *vol, int lnu
{
int err;
struct ubi_vid_io_buf *vidb;
+ struct ubi_vid_hdr *vid_hdr;

if (!ubi->fast_attach)
return 0;
@@ -552,6 +553,22 @@ static int check_mapping(struct ubi_device *ubi, struct ubi_volume *vol, int lnu
*pnum, err);

goto out_free;
+ } else {
+ int found_vol_id, found_lnum;
+
+ ubi_assert(err == 0 || err == UBI_IO_BITFLIPS);
+
+ vid_hdr = ubi_get_vid_hdr(vidb);
+ found_vol_id = be32_to_cpu(vid_hdr->vol_id);
+ found_lnum = be32_to_cpu(vid_hdr->lnum);
+
+ if (found_lnum != lnum || found_vol_id != vol->vol_id) {
+ ubi_err(ubi, "EBA mismatch! PEB %i is LEB %i:%i instead of LEB %i:%i",
+ *pnum, found_vol_id, found_lnum, vol->vol_id, lnum);
+ ubi_ro_mode(ubi);
+ err = -EINVAL;
+ goto out_free;
+ }
}

set_bit(lnum, vol->checkmap);
--
2.13.6
\
 
 \ /
  Last update: 2018-05-28 22:05    [W:0.036 / U:0.424 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site