target/linux/generic/patches-3.2/512-jffs2_eofdetect.patch

   1 --- a/fs/jffs2/build.c
   2 +++ b/fs/jffs2/build.c
   3 @@ -112,6 +112,17 @@ 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 +               if (c->mtd->unlock)
  10 +                       c->mtd->unlock(c->mtd, 0, c->mtd->size);
  11 +               printk("done.\n");
  12 +
  13 +               printk("%s(): erasing all blocks after the end marker... ", __func__);
  14 +               jffs2_erase_pending_blocks(c, -1);
  15 +               printk("done.\n");
  16 +       }
  17 +
  18         dbg_fsbuild("pass 1 starting\n");
  19         c->flags |= JFFS2_SB_FLAG_BUILDING;
  20         /* Now scan the directory tree, increasing nlink according to every dirent found. */
  21 --- a/fs/jffs2/scan.c
  22 +++ b/fs/jffs2/scan.c
  23 @@ -72,7 +72,7 @@ static int file_dirty(struct jffs2_sb_in
  24                 return ret;
  25         if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size)))
  26                 return ret;
  27 -       /* Turned wasted size into dirty, since we apparently
  28 +       /* Turned wasted size into dirty, since we apparently
  29            think it's recoverable now. */
  30         jeb->dirty_size += jeb->wasted_size;
  31         c->dirty_size += jeb->wasted_size;
  32 @@ -147,8 +147,11 @@ int jffs2_scan_medium(struct jffs2_sb_in
  33                 /* reset summary info for next eraseblock scan */
  34                 jffs2_sum_reset_collected(s);
  35
  36 -               ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
  37 -                                               buf_size, s);
  38 +               if (c->flags & (1 << 7))
  39 +                       ret = BLK_STATE_ALLFF;
  40 +               else
  41 +                       ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
  42 +                                                       buf_size, s);
  43
  44                 if (ret < 0)
  45                         goto out;
  46 @@ -403,7 +406,7 @@ static int jffs2_scan_xref_node(struct j
  47         if (!ref)
  48                 return -ENOMEM;
  49
  50 -       /* BEFORE jffs2_build_xattr_subsystem() called,
  51 +       /* BEFORE jffs2_build_xattr_subsystem() called,
  52          * and AFTER xattr_ref is marked as a dead xref,
  53          * ref->xid is used to store 32bit xid, xd is not used
  54          * ref->ino is used to store 32bit inode-number, ic is not used
  55 @@ -476,7 +479,7 @@ static int jffs2_scan_eraseblock (struct
  56                 struct jffs2_sum_marker *sm;
  57                 void *sumptr = NULL;
  58                 uint32_t sumlen;
  59 -
  60 +
  61                 if (!buf_size) {
  62                         /* XIP case. Just look, point at the summary if it's there */
  63                         sm = (void *)buf + c->sector_size - sizeof(*sm);
  64 @@ -492,9 +495,9 @@ static int jffs2_scan_eraseblock (struct
  65                                 buf_len = sizeof(*sm);
  66
  67                         /* Read as much as we want into the _end_ of the preallocated buffer */
  68 -                       err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len,
  69 +                       err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len,
  70                                                   jeb->offset + c->sector_size - buf_len,
  71 -                                                 buf_len);
  72 +                                                 buf_len);
  73                         if (err)
  74                                 return err;
  75
  76 @@ -513,9 +516,9 @@ static int jffs2_scan_eraseblock (struct
  77                                 }
  78                                 if (buf_len < sumlen) {
  79                                         /* Need to read more so that the entire summary node is present */
  80 -                                       err = jffs2_fill_scan_buf(c, sumptr,
  81 +                                       err = jffs2_fill_scan_buf(c, sumptr,
  82                                                                   jeb->offset + c->sector_size - sumlen,
  83 -                                                                 sumlen - buf_len);
  84 +                                                                 sumlen - buf_len);
  85                                         if (err)
  86                                                 return err;
  87                                 }
  88 @@ -528,7 +531,7 @@ static int jffs2_scan_eraseblock (struct
  89
  90                         if (buf_size && sumlen > buf_size)
  91                                 kfree(sumptr);
  92 -                       /* If it returns with a real error, bail.
  93 +                       /* If it returns with a real error, bail.
  94                            If it returns positive, that's a block classification
  95                            (i.e. BLK_STATE_xxx) so return that too.
  96                            If it returns zero, fall through to full scan. */
  97 @@ -549,6 +552,17 @@ static int jffs2_scan_eraseblock (struct
  98                         return err;
  99         }
 100
 101 +       if ((buf[0] == 0xde) &&
 102 +               (buf[1] == 0xad) &&
 103 +               (buf[2] == 0xc0) &&
 104 +               (buf[3] == 0xde)) {
 105 +               /* end of filesystem. erase everything after this point */
 106 +               printk("%s(): End of filesystem marker found at 0x%x\n", __func__, jeb->offset);
 107 +               c->flags |= (1 << 7);
 108 +
 109 +               return BLK_STATE_ALLFF;
 110 +       }
 111 +
 112         /* We temporarily use 'ofs' as a pointer into the buffer/jeb */
 113         ofs = 0;
 114         max_ofs = EMPTY_SCAN_SIZE(c->sector_size);
 115 @@ -674,7 +688,7 @@ scan_more:
 116                                 scan_end = buf_len;
 117                                 goto more_empty;
 118                         }
 119 -
 120 +
 121                         /* See how much more there is to read in this eraseblock... */
 122                         buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
 123                         if (!buf_len) {
 124 @@ -910,7 +924,7 @@ scan_more:
 125
 126         D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
 127                   jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size));
 128 -
 129 +
 130         /* mark_node_obsolete can add to wasted !! */
 131         if (jeb->wasted_size) {
 132                 jeb->dirty_size += jeb->wasted_size;