From 2a2af518266a29323cf30c3f9ba9ef2ceb1dd84b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= 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 --- drivers/mtd/ubi/attach.c | 5 +++++ drivers/mtd/ubi/io.c | 4 ++++ drivers/mtd/ubi/ubi.h | 1 + 3 files changed, 10 insertions(+) --- a/drivers/mtd/ubi/attach.c +++ b/drivers/mtd/ubi/attach.c @@ -95,6 +95,9 @@ static int self_check_ai(struct ubi_devi #define AV_ADD BIT(1) #define AV_FIND_OR_ADD (AV_FIND | AV_ADD) +/* Set on finding block with 0xdeadc0de, indicates erasing all blocks behind */ +bool erase_all_next; + /** * find_or_add_av - internal function to find a volume, add a volume or do * both (find and add if missing). @@ -1592,6 +1595,8 @@ int ubi_attach(struct ubi_device *ubi, i 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) { --- a/drivers/mtd/ubi/io.c +++ b/drivers/mtd/ubi/io.c @@ -723,6 +723,10 @@ int ubi_io_read_ec_hdr(struct ubi_device } 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; --- a/drivers/mtd/ubi/ubi.h +++ b/drivers/mtd/ubi/ubi.h @@ -833,6 +833,7 @@ extern struct mutex ubi_devices_mutex; extern struct blocking_notifier_head ubi_notifiers; /* attach.c */ +extern bool erase_all_next; struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum, int ec); void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb);