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From 2a2af518266a29323cf30c3f9ba9ef2ceb1dd84b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Thu, 16 Oct 2014 20:52:16 +0200
Subject: [PATCH] UBI: Detect EOF mark and erase all remaining blocks
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
drivers/mtd/ubi/attach.c | 5 +++++
drivers/mtd/ubi/io.c | 4 ++++
drivers/mtd/ubi/ubi.h | 1 +
3 files changed, 10 insertions(+)
diff --git a/drivers/mtd/ubi/attach.c b/drivers/mtd/ubi/attach.c
index 380268b..8f525c2 100644
--- a/drivers/mtd/ubi/attach.c
+++ b/drivers/mtd/ubi/attach.c
@@ -95,6 +95,9 @@ static int self_check_ai(struct ubi_device *ubi, struct ubi_attach_info *ai);
static struct ubi_ec_hdr *ech;
static struct ubi_vid_hdr *vidh;
+/* Set on finding block with 0xdeadc0de, indicates erasing all blocks behind */
+bool erase_all_next;
+
/**
* add_to_list - add physical eraseblock to a list.
* @ai: attaching information
@@ -1418,6 +1421,8 @@ int ubi_attach(struct ubi_device *ubi, int force_scan)
if (!ai)
return -ENOMEM;
+ erase_all_next = false;
+
#ifdef CONFIG_MTD_UBI_FASTMAP
/* On small flash devices we disable fastmap in any case. */
if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) {
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index d361349..f3d29ce 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -753,6 +753,10 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
}
magic = be32_to_cpu(ec_hdr->magic);
+ if (magic == 0xdeadc0de)
+ erase_all_next = true;
+ if (erase_all_next)
+ return read_err ? UBI_IO_FF_BITFLIPS : UBI_IO_FF;
if (magic != UBI_EC_HDR_MAGIC) {
if (mtd_is_eccerr(read_err))
return UBI_IO_BAD_HDR_EBADMSG;
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 1259e72..142ee3d 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -743,6 +743,7 @@ extern struct mutex ubi_devices_mutex;
extern struct blocking_notifier_head ubi_notifiers;
/* attach.c */
+extern bool erase_all_next;
int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
--
1.8.4.5
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