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From: Gabor Juhos <juhosg@openwrt.org>
Subject: mtd: add EOF marker support to the UBI layer
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
drivers/mtd/ubi/attach.c | 25 ++++++++++++++++++++++---
drivers/mtd/ubi/ubi.h | 1 +
2 files changed, 23 insertions(+), 3 deletions(-)
--- a/drivers/mtd/ubi/attach.c
+++ b/drivers/mtd/ubi/attach.c
@@ -939,6 +939,13 @@ static bool vol_ignored(int vol_id)
#endif
}
+static bool ec_hdr_has_eof(struct ubi_ec_hdr *ech)
+{
+ return ech->padding1[0] == 'E' &&
+ ech->padding1[1] == 'O' &&
+ ech->padding1[2] == 'F';
+}
+
/**
* scan_peb - scan and process UBI headers of a PEB.
* @ubi: UBI device description object
@@ -971,9 +978,21 @@ static int scan_peb(struct ubi_device *u
return 0;
}
- err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
- if (err < 0)
- return err;
+ if (!ai->eof_found) {
+ err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
+ if (err < 0)
+ return err;
+
+ if (ec_hdr_has_eof(ech)) {
+ pr_notice("UBI: EOF marker found, PEBs from %d will be erased\n",
+ pnum);
+ ai->eof_found = true;
+ }
+ }
+
+ if (ai->eof_found)
+ err = UBI_IO_FF_BITFLIPS;
+
switch (err) {
case 0:
break;
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -779,6 +779,7 @@ struct ubi_attach_info {
int mean_ec;
uint64_t ec_sum;
int ec_count;
+ bool eof_found;
struct kmem_cache *aeb_slab_cache;
struct ubi_ec_hdr *ech;
struct ubi_vid_io_buf *vidb;
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