target/linux/generic-2.4/patches/227-jffs2_eofdetect.patch

   1 Index: linux-2.4.35.4/fs/jffs2/build.c
   2 ===================================================================
   3 --- linux-2.4.35.4.orig/fs/jffs2/build.c
   4 +++ linux-2.4.35.4/fs/jffs2/build.c
   5 @@ -31,6 +31,10 @@
   6   * provisions above, a recipient may use your version of this file
   7   * under either the RHEPL or the GPL.
   8   *
   9 + * Modification for automatically cleaning the filesystem after
  10 + * a specially marked block
  11 + * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  12 + *
  13   * $Id: build.c,v 1.16.2.3 2003/04/30 09:43:32 dwmw2 Exp $
  14   *
  15   */
  16 @@ -38,6 +42,7 @@
  17  #include <linux/kernel.h>
  18  #include <linux/jffs2.h>
  19  #include <linux/slab.h>
  20 +#include <linux/mtd/mtd.h>
  21  #include "nodelist.h"
  22
  23  int jffs2_build_inode_pass1(struct jffs2_sb_info *, struct jffs2_inode_cache *);
  24 @@ -89,6 +94,18 @@ int jffs2_build_filesystem(struct jffs2_
  25         if (ret)
  26                 return ret;
  27
  28 +       if (c->flags & (1 << 7)) {
  29 +               printk("%s(): unlocking the mtd device... ", __func__);
  30 +               if (c->mtd->unlock)
  31 +                       c->mtd->unlock(c->mtd, 0, c->mtd->size);
  32 +               printk("done.\n");
  33 +
  34 +               printk("%s(): erasing all blocks after the end marker... ", __func__);
  35 +               jffs2_erase_pending_blocks(c);
  36 +               jffs2_mark_erased_blocks(c);
  37 +               printk("done.\n");
  38 +       }
  39 +
  40         D1(printk(KERN_DEBUG "Scanned flash completely\n"));
  41         /* Now build the data map for each inode, marking obsoleted nodes
  42            as such, and also increase nlink of any children. */
  43 Index: linux-2.4.35.4/fs/jffs2/scan.c
  44 ===================================================================
  45 --- linux-2.4.35.4.orig/fs/jffs2/scan.c
  46 +++ linux-2.4.35.4/fs/jffs2/scan.c
  47 @@ -31,6 +31,10 @@
  48   * provisions above, a recipient may use your version of this file
  49   * under either the RHEPL or the GPL.
  50   *
  51 + * Modification for automatically cleaning the filesystem after
  52 + * a specially marked block
  53 + * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  54 + *
  55   * $Id: scan.c,v 1.51.2.4 2003/11/02 13:51:18 dwmw2 Exp $
  56   *
  57   */
  58 @@ -88,7 +92,12 @@ int jffs2_scan_medium(struct jffs2_sb_in
  59         for (i=0; i<c->nr_blocks; i++) {
  60                 struct jffs2_eraseblock *jeb = &c->blocks[i];
  61
  62 -               ret = jffs2_scan_eraseblock(c, jeb);
  63 +
  64 +               if (c->flags & (1 << 7))
  65 +                       ret = 1;
  66 +               else
  67 +                       ret = jffs2_scan_eraseblock(c, jeb);
  68 +
  69                 if (ret < 0)
  70                         return ret;
  71
  72 @@ -181,6 +190,7 @@ static int jffs2_scan_eraseblock (struct
  73
  74         while(ofs < jeb->offset + c->sector_size) {
  75                 ssize_t retlen;
  76 +               unsigned char *buf = (unsigned char *) &node;
  77                 ACCT_PARANOIA_CHECK(jeb);
  78
  79                 if (ofs & 3) {
  80 @@ -202,8 +212,18 @@ static int jffs2_scan_eraseblock (struct
  81                         break;
  82                 }
  83
  84 -               err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, (char *)&node);
  85 +               err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, buf);
  86 +               if ((buf[0] == 0xde) &&
  87 +                       (buf[1] == 0xad) &&
  88 +                       (buf[2] == 0xc0) &&
  89 +                       (buf[3] == 0xde)) {
  90 +
  91 +                       /* end of filesystem. erase everything after this point */
  92 +                       c->flags |= (1 << 7);
  93 +                       printk("jffs2_scan_eraseblock(): End of filesystem marker found at 0x%x\n", jeb->offset);
  94
  95 +                       return 1;
  96 +               }
  97                 if (err) {
  98                         D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", sizeof(node), ofs, err));
  99                         return err;