target/linux/generic/pending-5.4/532-jffs2_eofdetect.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Subject: fs: jffs2: EOF marker
   3
   4 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   5 ---
   6  fs/jffs2/build.c | 10 ++++++++++
   7  fs/jffs2/scan.c  | 21 +++++++++++++++++++--
   8  2 files changed, 29 insertions(+), 2 deletions(-)
   9
  10 --- a/fs/jffs2/build.c
  11 +++ b/fs/jffs2/build.c
  12 @@ -117,6 +117,16 @@ static int jffs2_build_filesystem(struct
  13         dbg_fsbuild("scanned flash completely\n");
  14         jffs2_dbg_dump_block_lists_nolock(c);
  15
  16 +       if (c->flags & (1 << 7)) {
  17 +               printk("%s(): unlocking the mtd device... ", __func__);
  18 +               mtd_unlock(c->mtd, 0, c->mtd->size);
  19 +               printk("done.\n");
  20 +
  21 +               printk("%s(): erasing all blocks after the end marker... ", __func__);
  22 +               jffs2_erase_pending_blocks(c, -1);
  23 +               printk("done.\n");
  24 +       }
  25 +
  26         dbg_fsbuild("pass 1 starting\n");
  27         c->flags |= JFFS2_SB_FLAG_BUILDING;
  28         /* Now scan the directory tree, increasing nlink according to every dirent found. */
  29 --- a/fs/jffs2/scan.c
  30 +++ b/fs/jffs2/scan.c
  31 @@ -148,8 +148,14 @@ int jffs2_scan_medium(struct jffs2_sb_in
  32                 /* reset summary info for next eraseblock scan */
  33                 jffs2_sum_reset_collected(s);
  34
  35 -               ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
  36 -                                               buf_size, s);
  37 +               if (c->flags & (1 << 7)) {
  38 +                       if (mtd_block_isbad(c->mtd, jeb->offset))
  39 +                               ret = BLK_STATE_BADBLOCK;
  40 +                       else
  41 +                               ret = BLK_STATE_ALLFF;
  42 +               } else
  43 +                       ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
  44 +                                                       buf_size, s);
  45
  46                 if (ret < 0)
  47                         goto out;
  48 @@ -564,6 +570,17 @@ full_scan:
  49                         return err;
  50         }
  51
  52 +       if ((buf[0] == 0xde) &&
  53 +               (buf[1] == 0xad) &&
  54 +               (buf[2] == 0xc0) &&
  55 +               (buf[3] == 0xde)) {
  56 +               /* end of filesystem. erase everything after this point */
  57 +               printk("%s(): End of filesystem marker found at 0x%x\n", __func__, jeb->offset);
  58 +               c->flags |= (1 << 7);
  59 +
  60 +               return BLK_STATE_ALLFF;
  61 +       }
  62 +
  63         /* We temporarily use 'ofs' as a pointer into the buffer/jeb */
  64         ofs = 0;
  65         max_ofs = EMPTY_SCAN_SIZE(c->sector_size);