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backport jffs2 eofdetect patch to linux 2.4

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SVN-Revision: 4044
This commit is contained in:
Felix Fietkau 2006-06-21 22:30:26 +00:00
parent ee438066a3
commit 62b5f4818e
1 changed files with 87 additions and 0 deletions
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87
openwrt/target/linux/generic-2.4/patches/227-jffs2_eofdetect.patch Normal file
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@ -0,0 +1,87 @@
diff -ur linux.old/fs/jffs2/scan.c linux.dev/fs/jffs2/scan.c
--- linux.old/fs/jffs2/scan.c 2003-11-28 19:26:21.000000000 +0100
+++ linux.dev/fs/jffs2/scan.c 2006-06-22 00:29:02.000000000 +0200
@@ -31,6 +31,10 @@
* provisions above, a recipient may use your version of this file
* under either the RHEPL or the GPL.
*
+ * Modification for automatically cleaning the filesystem after
+ * a specially marked block
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ *
* $Id: scan.c,v 1.51.2.4 2003/11/02 13:51:18 dwmw2 Exp $
*
*/
@@ -88,7 +92,12 @@
for (i=0; i<c->nr_blocks; i++) {
struct jffs2_eraseblock *jeb = &c->blocks[i];
- ret = jffs2_scan_eraseblock(c, jeb);
+
+ if (c->flags & (1 << 7))
+ ret = 1;
+ else
+ ret = jffs2_scan_eraseblock(c, jeb);
+
if (ret < 0)
return ret;
@@ -145,15 +154,22 @@
c->nr_erasing_blocks++;
}
}
- /* Rotate the lists by some number to ensure wear levelling */
- jffs2_rotate_lists(c);
- if (c->nr_erasing_blocks) {
- if (!c->used_size && empty_blocks != c->nr_blocks) {
- printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
- return -EIO;
+ if (c->flags & (1 << 7)) {
+ printk("jffs2_scan_medium(): erasing all blocks after the end marker...\n");
+ jffs2_erase_pending_blocks(c);
+ printk("jffs2_scan_medium(): done.\n");
+ } else {
+ /* Rotate the lists by some number to ensure wear levelling */
+ jffs2_rotate_lists(c);
+
+ if (c->nr_erasing_blocks) {
+ if (!c->used_size && empty_blocks != c->nr_blocks) {
+ printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
+ return -EIO;
+ }
+ jffs2_erase_pending_trigger(c);
}
- jffs2_erase_pending_trigger(c);
}
return 0;
}
@@ -181,6 +197,7 @@
while(ofs < jeb->offset + c->sector_size) {
ssize_t retlen;
+ unsigned char *buf = (unsigned char *) &node;
ACCT_PARANOIA_CHECK(jeb);
if (ofs & 3) {
@@ -202,8 +219,18 @@
break;
}
- err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, (char *)&node);
+ err = c->mtd->read(c->mtd, ofs, sizeof(node), &retlen, buf);
+ if ((buf[0] == 0xde) &&
+ (buf[1] == 0xad) &&
+ (buf[2] == 0xc0) &&
+ (buf[3] == 0xde)) {
+
+ /* end of filesystem. erase everything after this point */
+ c->flags |= (1 << 7);
+ printk("jffs2_scan_eraseblock(): End of filesystem marker found at 0x%x\n", jeb->offset);
+ return 1;
+ }
if (err) {
D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", sizeof(node), ofs, err));
return err;