target/linux/generic/patches-4.9/532-jffs2_eofdetect.patch

   1 --- a/fs/jffs2/build.c
   2 +++ b/fs/jffs2/build.c
   3 @@ -117,6 +117,16 @@ static int jffs2_build_filesystem(struct
   4         dbg_fsbuild("scanned flash completely\n");
   5         jffs2_dbg_dump_block_lists_nolock(c);
   6
   7 +       if (c->flags & (1 << 7)) {
   8 +               printk("%s(): unlocking the mtd device... ", __func__);
   9 +               mtd_unlock(c->mtd, 0, c->mtd->size);
  10 +               printk("done.\n");
  11 +
  12 +               printk("%s(): erasing all blocks after the end marker... ", __func__);
  13 +               jffs2_erase_pending_blocks(c, -1);
  14 +               printk("done.\n");
  15 +       }
  16 +
  17         dbg_fsbuild("pass 1 starting\n");
  18         c->flags |= JFFS2_SB_FLAG_BUILDING;
  19         /* Now scan the directory tree, increasing nlink according to every dirent found. */
  20 --- a/fs/jffs2/scan.c
  21 +++ b/fs/jffs2/scan.c
  22 @@ -148,8 +148,14 @@ int jffs2_scan_medium(struct jffs2_sb_in
  23                 /* reset summary info for next eraseblock scan */
  24                 jffs2_sum_reset_collected(s);
  25
  26 -               ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
  27 -                                               buf_size, s);
  28 +               if (c->flags & (1 << 7)) {
  29 +                       if (mtd_block_isbad(c->mtd, jeb->offset))
  30 +                               ret = BLK_STATE_BADBLOCK;
  31 +                       else
  32 +                               ret = BLK_STATE_ALLFF;
  33 +               } else
  34 +                       ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
  35 +                                                       buf_size, s);
  36
  37                 if (ret < 0)
  38                         goto out;
  39 @@ -561,6 +567,17 @@ full_scan:
  40                         return err;
  41         }
  42
  43 +       if ((buf[0] == 0xde) &&
  44 +               (buf[1] == 0xad) &&
  45 +               (buf[2] == 0xc0) &&
  46 +               (buf[3] == 0xde)) {
  47 +               /* end of filesystem. erase everything after this point */
  48 +               printk("%s(): End of filesystem marker found at 0x%x\n", __func__, jeb->offset);
  49 +               c->flags |= (1 << 7);
  50 +
  51 +               return BLK_STATE_ALLFF;
  52 +       }
  53 +
  54         /* We temporarily use 'ofs' as a pointer into the buffer/jeb */
  55         ofs = 0;
  56         max_ofs = EMPTY_SCAN_SIZE(c->sector_size);