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ubi: fastmap: Detect EBA mismatches on-the-fly

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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>
This commit is contained in:
Richard Weinberger 2018-05-28 22:04:34 +02:00
parent 34653fd8c4
commit 3e5e4335cc
1 changed files with 17 additions and 0 deletions
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17
drivers/mtd/ubi/eba.c
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@ -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);