target/linux/bcm53xx/patches-4.14/500-UBI-Detect-EOF-mark-and-erase-all-remaining-blocks.patch

   1 From 2a2af518266a29323cf30c3f9ba9ef2ceb1dd84b Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
   3 Date: Thu, 16 Oct 2014 20:52:16 +0200
   4 Subject: [PATCH] UBI: Detect EOF mark and erase all remaining blocks
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  10 ---
  11  drivers/mtd/ubi/attach.c | 5 +++++
  12  drivers/mtd/ubi/io.c     | 4 ++++
  13  drivers/mtd/ubi/ubi.h    | 1 +
  14  3 files changed, 10 insertions(+)
  15
  16 --- a/drivers/mtd/ubi/attach.c
  17 +++ b/drivers/mtd/ubi/attach.c
  18 @@ -95,6 +95,9 @@ static int self_check_ai(struct ubi_devi
  19  #define AV_ADD         BIT(1)
  20  #define AV_FIND_OR_ADD (AV_FIND | AV_ADD)
  21
  22 +/* Set on finding block with 0xdeadc0de, indicates erasing all blocks behind */
  23 +bool erase_all_next;
  24 +
  25  /**
  26   * find_or_add_av - internal function to find a volume, add a volume or do
  27   *                 both (find and add if missing).
  28 @@ -1592,6 +1595,8 @@ int ubi_attach(struct ubi_device *ubi, i
  29         if (!ai)
  30                 return -ENOMEM;
  31
  32 +       erase_all_next = false;
  33 +
  34  #ifdef CONFIG_MTD_UBI_FASTMAP
  35         /* On small flash devices we disable fastmap in any case. */
  36         if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) {
  37 --- a/drivers/mtd/ubi/io.c
  38 +++ b/drivers/mtd/ubi/io.c
  39 @@ -759,6 +759,10 @@ int ubi_io_read_ec_hdr(struct ubi_device
  40         }
  41
  42         magic = be32_to_cpu(ec_hdr->magic);
  43 +       if (magic == 0xdeadc0de)
  44 +               erase_all_next = true;
  45 +       if (erase_all_next)
  46 +               return read_err ? UBI_IO_FF_BITFLIPS : UBI_IO_FF;
  47         if (magic != UBI_EC_HDR_MAGIC) {
  48                 if (mtd_is_eccerr(read_err))
  49                         return UBI_IO_BAD_HDR_EBADMSG;
  50 --- a/drivers/mtd/ubi/ubi.h
  51 +++ b/drivers/mtd/ubi/ubi.h
  52 @@ -829,6 +829,7 @@ extern struct mutex ubi_devices_mutex;
  53  extern struct blocking_notifier_head ubi_notifiers;
  54
  55  /* attach.c */
  56 +extern bool erase_all_next;
  57  struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum,
  58                                    int ec);
  59  void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb);