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From 2a2af518266a29323cf30c3f9ba9ef2ceb1dd84b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Thu, 16 Oct 2014 20:52:16 +0200
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Subject: [PATCH] UBI: Detect EOF mark and erase all remaining blocks
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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---
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drivers/mtd/ubi/attach.c | 5 +++++
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drivers/mtd/ubi/io.c | 4 ++++
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drivers/mtd/ubi/ubi.h | 1 +
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3 files changed, 10 insertions(+)
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--- a/drivers/mtd/ubi/attach.c
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+++ b/drivers/mtd/ubi/attach.c
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@@ -95,6 +95,9 @@ static int self_check_ai(struct ubi_devi
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static struct ubi_ec_hdr *ech;
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static struct ubi_vid_hdr *vidh;
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+/* Set on finding block with 0xdeadc0de, indicates erasing all blocks behind */
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+bool erase_all_next;
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+
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/**
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* add_to_list - add physical eraseblock to a list.
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* @ai: attaching information
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@@ -1425,6 +1428,8 @@ int ubi_attach(struct ubi_device *ubi, i
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if (!ai)
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return -ENOMEM;
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+ erase_all_next = false;
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+
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#ifdef CONFIG_MTD_UBI_FASTMAP
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/* On small flash devices we disable fastmap in any case. */
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if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) {
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--- a/drivers/mtd/ubi/io.c
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+++ b/drivers/mtd/ubi/io.c
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@@ -755,6 +755,10 @@ int ubi_io_read_ec_hdr(struct ubi_device
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}
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magic = be32_to_cpu(ec_hdr->magic);
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+ if (magic == 0xdeadc0de)
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+ erase_all_next = true;
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+ if (erase_all_next)
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+ return read_err ? UBI_IO_FF_BITFLIPS : UBI_IO_FF;
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if (magic != UBI_EC_HDR_MAGIC) {
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if (mtd_is_eccerr(read_err))
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return UBI_IO_BAD_HDR_EBADMSG;
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--- a/drivers/mtd/ubi/ubi.h
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+++ b/drivers/mtd/ubi/ubi.h
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@@ -783,6 +783,7 @@ extern struct mutex ubi_devices_mutex;
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extern struct blocking_notifier_head ubi_notifiers;
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/* attach.c */
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+extern bool erase_all_next;
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int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
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int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
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struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
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