/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright (C) 2001-2003 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: nodelist.c,v 1.115 2005/11/07 11:14:40 gleixner Exp $
*
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/mtd/mtd.h>
#include <linux/rbtree.h>
#include <linux/crc32.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include "nodelist.h"
void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list)
{
struct jffs2_full_dirent **prev = list;
dbg_dentlist("add dirent \"%s\", ino #%u\n", new->name, new->ino);
while ((*prev) && (*prev)->nhash <= new->nhash) {
if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) {
/* Duplicate. Free one */
if (new->version < (*prev)->version) {
dbg_dentlist("Eep! Marking new dirent node is obsolete, old is \"%s\", ino #%u\n",
(*prev)->name, (*prev)->ino);
jffs2_mark_node_obsolete(c, new->raw);
jffs2_free_full_dirent(new);
} else {
dbg_dentlist("marking old dirent \"%s\", ino #%u bsolete\n",
(*prev)->name, (*prev)->ino);
new->next = (*prev)->next;
jffs2_mark_node_obsolete(c, ((*prev)->raw));
jffs2_free_full_dirent(*prev);
*prev = new;
}
return;
}
prev = &((*prev)->next);
}
new->next = *prev;
*prev = new;
}
void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size)
{
struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size);
dbg_fragtree("truncating fragtree to 0x%08x bytes\n", size);
/* We know frag->ofs <= size. That's what lookup does for us */
if (frag && frag->ofs != size) {
if (frag->ofs+frag->size > size) {
frag->size = size - frag->ofs;
}
frag = frag_next(frag);
}
while (frag && frag->ofs >= size) {
struct jffs2_node_frag *next = frag_next(frag);
frag_erase(frag, list);
jffs2_obsolete_node_frag(c, frag);
frag = next;
}
if (size == 0)
return;
/*
* If the last fragment starts at the RAM page boundary, it is
* REF_PRISTINE irrespective of its size.
*/
frag = frag_last(list);
if (frag->node && (frag->ofs & (PAGE_CACHE_SIZE - 1)) == 0) {
dbg_fragtree2("marking the last fragment 0x%08x-0x%08x REF_PRISTINE.\n",
frag->ofs, frag->ofs + frag->size);
frag->node->raw->flash_offset = ref_offset(frag->node->raw) | REF_PRISTINE;
}
}
void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this)
{
if (this->node) {
this->node->frags--;
if (!this->node->frags) {
/* The node has no valid frags left. It's totally obsoleted */
dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) obsolete\n",
ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size);
jffs2_mark_node_obsolete(c, this->node->raw);
jffs2_free_full_dnode(this->node);
} else {
dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n",
ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size, this<