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From: Gabor Juhos <juhosg@openwrt.org>
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Subject: mtd: add EOF marker support to the UBI layer
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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---
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drivers/mtd/ubi/attach.c | 25 ++++++++++++++++++++++---
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drivers/mtd/ubi/ubi.h | 1 +
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2 files changed, 23 insertions(+), 3 deletions(-)
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--- a/drivers/mtd/ubi/attach.c
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+++ b/drivers/mtd/ubi/attach.c
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@@ -939,6 +939,13 @@ static bool vol_ignored(int vol_id)
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#endif
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}
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+static bool ec_hdr_has_eof(struct ubi_ec_hdr *ech)
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+{
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+ return ech->padding1[0] == 'E' &&
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+ ech->padding1[1] == 'O' &&
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+ ech->padding1[2] == 'F';
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+}
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+
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/**
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* scan_peb - scan and process UBI headers of a PEB.
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* @ubi: UBI device description object
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@@ -971,9 +978,21 @@ static int scan_peb(struct ubi_device *u
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return 0;
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}
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- err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
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- if (err < 0)
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- return err;
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+ if (!ai->eof_found) {
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+ err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
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+ if (err < 0)
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+ return err;
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+
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+ if (ec_hdr_has_eof(ech)) {
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+ pr_notice("UBI: EOF marker found, PEBs from %d will be erased\n",
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+ pnum);
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+ ai->eof_found = true;
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+ }
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+ }
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+
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+ if (ai->eof_found)
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+ err = UBI_IO_FF_BITFLIPS;
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+
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switch (err) {
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case 0:
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break;
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--- a/drivers/mtd/ubi/ubi.h
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+++ b/drivers/mtd/ubi/ubi.h
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@@ -789,6 +789,7 @@ struct ubi_attach_info {
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int mean_ec;
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uint64_t ec_sum;
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int ec_count;
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+ bool eof_found;
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struct kmem_cache *aeb_slab_cache;
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struct ubi_ec_hdr *ech;
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struct ubi_vid_io_buf *vidb;
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