![Artem B. Bityutskiy](/assets/img/avatar_default.png)
Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
559 lines
17 KiB
C
559 lines
17 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2001-2003 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: nodelist.c,v 1.103 2005/07/31 08:20:44 dedekind Exp $
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*
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/mtd/mtd.h>
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#include <linux/rbtree.h>
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#include <linux/crc32.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include "nodelist.h"
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void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list)
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{
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struct jffs2_full_dirent **prev = list;
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JFFS2_DBG_DENTLIST("add dirent \"%s\", ino #%u\n", new->name, new->ino);
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while ((*prev) && (*prev)->nhash <= new->nhash) {
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if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) {
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/* Duplicate. Free one */
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if (new->version < (*prev)->version) {
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JFFS2_DBG_DENTLIST("Eep! Marking new dirent node is obsolete, old is \"%s\", ino #%u\n",
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(*prev)->name, (*prev)->ino);
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jffs2_mark_node_obsolete(c, new->raw);
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jffs2_free_full_dirent(new);
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} else {
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JFFS2_DBG_DENTLIST("marking old dirent \"%s\", ino #%u bsolete\n",
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(*prev)->name, (*prev)->ino);
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new->next = (*prev)->next;
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jffs2_mark_node_obsolete(c, ((*prev)->raw));
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jffs2_free_full_dirent(*prev);
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*prev = new;
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}
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return;
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}
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prev = &((*prev)->next);
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}
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new->next = *prev;
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*prev = new;
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}
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void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size)
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{
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struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size);
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JFFS2_DBG_FRAGTREE("truncating fragtree to 0x%08x bytes\n", size);
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/* We know frag->ofs <= size. That's what lookup does for us */
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if (frag && frag->ofs != size) {
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if (frag->ofs+frag->size >= size) {
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JFFS2_DBG_FRAGTREE2("truncating frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size);
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frag->size = size - frag->ofs;
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}
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frag = frag_next(frag);
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}
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while (frag && frag->ofs >= size) {
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struct jffs2_node_frag *next = frag_next(frag);
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JFFS2_DBG_FRAGTREE("removing frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size);
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frag_erase(frag, list);
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jffs2_obsolete_node_frag(c, frag);
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frag = next;
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}
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}
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void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this)
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{
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if (this->node) {
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this->node->frags--;
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if (!this->node->frags) {
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/* The node has no valid frags left. It's totally obsoleted */
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JFFS2_DBG_FRAGTREE2("marking old node @0x%08x (0x%04x-0x%04x) obsolete\n",
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ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size);
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jffs2_mark_node_obsolete(c, this->node->raw);
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jffs2_free_full_dnode(this->node);
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} else {
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JFFS2_DBG_FRAGTREE2("marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n",
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ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size, this->node->frags);
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mark_ref_normal(this->node->raw);
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}
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}
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jffs2_free_node_frag(this);
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}
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static void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base)
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{
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struct rb_node *parent = &base->rb;
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struct rb_node **link = &parent;
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JFFS2_DBG_FRAGTREE2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size);
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while (*link) {
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parent = *link;
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base = rb_entry(parent, struct jffs2_node_frag, rb);
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JFFS2_DBG_FRAGTREE2("considering frag at 0x%08x\n", base->ofs);
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if (newfrag->ofs > base->ofs)
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link = &base->rb.rb_right;
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else if (newfrag->ofs < base->ofs)
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link = &base->rb.rb_left;
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else {
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JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
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BUG();
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}
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}
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rb_link_node(&newfrag->rb, &base->rb, link);
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}
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/* Doesn't set inode->i_size */
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static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *list, struct jffs2_node_frag *newfrag)
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{
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struct jffs2_node_frag *this;
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uint32_t lastend;
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/* Skip all the nodes which are completed before this one starts */
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this = jffs2_lookup_node_frag(list, newfrag->node->ofs);
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if (this) {
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JFFS2_DBG_FRAGTREE2("lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",
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this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this);
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lastend = this->ofs + this->size;
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} else {
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JFFS2_DBG_FRAGTREE2("lookup gave no frag\n");
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lastend = 0;
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}
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/* See if we ran off the end of the list */
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if (lastend <= newfrag->ofs) {
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/* We did */
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/* Check if 'this' node was on the same page as the new node.
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If so, both 'this' and the new node get marked REF_NORMAL so
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the GC can take a look.
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*/
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if (lastend && (lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) {
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if (this->node)
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mark_ref_normal(this->node->raw);
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mark_ref_normal(newfrag->node->raw);
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}
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if (lastend < newfrag->node->ofs) {
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/* ... and we need to put a hole in before the new node */
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struct jffs2_node_frag *holefrag = jffs2_alloc_node_frag();
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if (!holefrag) {
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jffs2_free_node_frag(newfrag);
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return -ENOMEM;
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}
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holefrag->ofs = lastend;
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holefrag->size = newfrag->node->ofs - lastend;
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holefrag->node = NULL;
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if (this) {
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/* By definition, the 'this' node has no right-hand child,
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because there are no frags with offset greater than it.
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So that's where we want to put the hole */
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JFFS2_DBG_FRAGTREE2("adding hole frag (%p) on right of node at (%p)\n", holefrag, this);
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rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right);
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} else {
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JFFS2_DBG_FRAGTREE2("adding hole frag (%p) at root of tree\n", holefrag);
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rb_link_node(&holefrag->rb, NULL, &list->rb_node);
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}
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rb_insert_color(&holefrag->rb, list);
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this = holefrag;
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}
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if (this) {
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/* By definition, the 'this' node has no right-hand child,
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because there are no frags with offset greater than it.
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So that's where we want to put new fragment */
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JFFS2_DBG_FRAGTREE2("adding new frag (%p) on right of node at (%p)\n", newfrag, this);
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rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
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} else {
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JFFS2_DBG_FRAGTREE2("adding new frag (%p) at root of tree\n", newfrag);
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rb_link_node(&newfrag->rb, NULL, &list->rb_node);
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}
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rb_insert_color(&newfrag->rb, list);
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return 0;
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}
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JFFS2_DBG_FRAGTREE2("dealing with frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",
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this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this);
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/* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes,
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* - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs
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*/
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if (newfrag->ofs > this->ofs) {
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/* This node isn't completely obsoleted. The start of it remains valid */
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/* Mark the new node and the partially covered node REF_NORMAL -- let
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the GC take a look at them */
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mark_ref_normal(newfrag->node->raw);
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if (this->node)
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mark_ref_normal(this->node->raw);
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if (this->ofs + this->size > newfrag->ofs + newfrag->size) {
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/* The new node splits 'this' frag into two */
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struct jffs2_node_frag *newfrag2 = jffs2_alloc_node_frag();
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if (!newfrag2) {
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jffs2_free_node_frag(newfrag);
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return -ENOMEM;
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}
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if (this->node)
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JFFS2_DBG_FRAGTREE2("split old frag 0x%04x-0x%04x, phys 0x%08x\n",
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this->ofs, this->ofs+this->size, ref_offset(this->node->raw));
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else
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JFFS2_DBG_FRAGTREE2("split old hole frag 0x%04x-0x%04x\n",
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this->ofs, this->ofs+this->size, ref_offset(this->node->raw));
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/* New second frag pointing to this's node */
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newfrag2->ofs = newfrag->ofs + newfrag->size;
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newfrag2->size = (this->ofs+this->size) - newfrag2->ofs;
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newfrag2->node = this->node;
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if (this->node)
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this->node->frags++;
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/* Adjust size of original 'this' */
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this->size = newfrag->ofs - this->ofs;
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/* Now, we know there's no node with offset
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greater than this->ofs but smaller than
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newfrag2->ofs or newfrag->ofs, for obvious
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reasons. So we can do a tree insert from
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'this' to insert newfrag, and a tree insert
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from newfrag to insert newfrag2. */
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jffs2_fragtree_insert(newfrag, this);
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rb_insert_color(&newfrag->rb, list);
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jffs2_fragtree_insert(newfrag2, newfrag);
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rb_insert_color(&newfrag2->rb, list);
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return 0;
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}
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/* New node just reduces 'this' frag in size, doesn't split it */
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this->size = newfrag->ofs - this->ofs;
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/* Again, we know it lives down here in the tree */
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jffs2_fragtree_insert(newfrag, this);
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rb_insert_color(&newfrag->rb, list);
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} else {
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/* New frag starts at the same point as 'this' used to. Replace
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it in the tree without doing a delete and insertion */
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JFFS2_DBG_FRAGTREE2("inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n",
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newfrag, newfrag->ofs, newfrag->ofs+newfrag->size, this, this->ofs, this->ofs+this->size);
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rb_replace_node(&this->rb, &newfrag->rb, list);
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if (newfrag->ofs + newfrag->size >= this->ofs+this->size) {
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JFFS2_DBG_FRAGTREE2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size);
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jffs2_obsolete_node_frag(c, this);
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} else {
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this->ofs += newfrag->size;
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this->size -= newfrag->size;
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jffs2_fragtree_insert(this, newfrag);
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rb_insert_color(&this->rb, list);
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return 0;
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}
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}
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/* OK, now we have newfrag added in the correct place in the tree, but
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frag_next(newfrag) may be a fragment which is overlapped by it
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*/
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while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) {
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/* 'this' frag is obsoleted completely. */
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JFFS2_DBG_FRAGTREE2("obsoleting node frag %p (%x-%x) and removing from tree\n",
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this, this->ofs, this->ofs+this->size);
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rb_erase(&this->rb, list);
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jffs2_obsolete_node_frag(c, this);
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}
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/* Now we're pointing at the first frag which isn't totally obsoleted by
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the new frag */
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if (!this || newfrag->ofs + newfrag->size == this->ofs) {
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return 0;
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}
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/* Still some overlap but we don't need to move it in the tree */
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this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size);
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this->ofs = newfrag->ofs + newfrag->size;
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/* And mark them REF_NORMAL so the GC takes a look at them */
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if (this->node)
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mark_ref_normal(this->node->raw);
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mark_ref_normal(newfrag->node->raw);
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return 0;
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}
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/* Given an inode, probably with existing list of fragments, add the new node
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* to the fragment list.
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*/
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int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn)
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{
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int ret;
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struct jffs2_node_frag *newfrag;
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if (unlikely(!fn->size))
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return 0;
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newfrag = jffs2_alloc_node_frag();
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if (unlikely(!newfrag))
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return -ENOMEM;
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JFFS2_DBG_FRAGTREE("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n",
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fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag);
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newfrag->ofs = fn->ofs;
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newfrag->size = fn->size;
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newfrag->node = fn;
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newfrag->node->frags = 1;
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ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag);
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if (unlikely(ret))
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return ret;
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/* If we now share a page with other nodes, mark either previous
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or next node REF_NORMAL, as appropriate. */
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if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) {
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struct jffs2_node_frag *prev = frag_prev(newfrag);
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mark_ref_normal(fn->raw);
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/* If we don't start at zero there's _always_ a previous */
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if (prev->node)
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mark_ref_normal(prev->node->raw);
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}
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if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) {
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struct jffs2_node_frag *next = frag_next(newfrag);
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if (next) {
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mark_ref_normal(fn->raw);
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if (next->node)
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mark_ref_normal(next->node->raw);
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}
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}
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jffs2_dbg_fragtree_paranoia_check_nolock(f);
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jffs2_dbg_dump_fragtree_nolock(f);
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return 0;
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}
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void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state)
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{
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spin_lock(&c->inocache_lock);
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ic->state = state;
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wake_up(&c->inocache_wq);
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spin_unlock(&c->inocache_lock);
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}
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/* During mount, this needs no locking. During normal operation, its
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callers want to do other stuff while still holding the inocache_lock.
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Rather than introducing special case get_ino_cache functions or
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callbacks, we just let the caller do the locking itself. */
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struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
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{
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struct jffs2_inode_cache *ret;
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ret = c->inocache_list[ino % INOCACHE_HASHSIZE];
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while (ret && ret->ino < ino) {
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ret = ret->next;
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}
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if (ret && ret->ino != ino)
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ret = NULL;
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return ret;
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}
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void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new)
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{
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struct jffs2_inode_cache **prev;
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spin_lock(&c->inocache_lock);
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if (!new->ino)
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new->ino = ++c->highest_ino;
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JFFS2_DBG_INOCACHE("add %p (ino #%u)\n", new, new->ino);
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prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE];
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while ((*prev) && (*prev)->ino < new->ino) {
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prev = &(*prev)->next;
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}
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new->next = *prev;
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*prev = new;
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spin_unlock(&c->inocache_lock);
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}
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void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old)
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{
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struct jffs2_inode_cache **prev;
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JFFS2_DBG_INOCACHE("del %p (ino #%u)\n", old, old->ino);
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spin_lock(&c->inocache_lock);
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prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE];
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while ((*prev) && (*prev)->ino < old->ino) {
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prev = &(*prev)->next;
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}
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if ((*prev) == old) {
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*prev = old->next;
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}
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/* Free it now unless it's in READING or CLEARING state, which
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are the transitions upon read_inode() and clear_inode(). The
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rest of the time we know nobody else is looking at it, and
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if it's held by read_inode() or clear_inode() they'll free it
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for themselves. */
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if (old->state != INO_STATE_READING && old->state != INO_STATE_CLEARING)
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jffs2_free_inode_cache(old);
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spin_unlock(&c->inocache_lock);
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}
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void jffs2_free_ino_caches(struct jffs2_sb_info *c)
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{
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int i;
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struct jffs2_inode_cache *this, *next;
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for (i=0; i<INOCACHE_HASHSIZE; i++) {
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this = c->inocache_list[i];
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while (this) {
|
|
next = this->next;
|
|
jffs2_free_inode_cache(this);
|
|
this = next;
|
|
}
|
|
c->inocache_list[i] = NULL;
|
|
}
|
|
}
|
|
|
|
void jffs2_free_raw_node_refs(struct jffs2_sb_info *c)
|
|
{
|
|
int i;
|
|
struct jffs2_raw_node_ref *this, *next;
|
|
|
|
for (i=0; i<c->nr_blocks; i++) {
|
|
this = c->blocks[i].first_node;
|
|
while(this) {
|
|
next = this->next_phys;
|
|
jffs2_free_raw_node_ref(this);
|
|
this = next;
|
|
}
|
|
c->blocks[i].first_node = c->blocks[i].last_node = NULL;
|
|
}
|
|
}
|
|
|
|
struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset)
|
|
{
|
|
/* The common case in lookup is that there will be a node
|
|
which precisely matches. So we go looking for that first */
|
|
struct rb_node *next;
|
|
struct jffs2_node_frag *prev = NULL;
|
|
struct jffs2_node_frag *frag = NULL;
|
|
|
|
JFFS2_DBG_FRAGTREE2("root %p, offset %d\n", fragtree, offset);
|
|
|
|
next = fragtree->rb_node;
|
|
|
|
while(next) {
|
|
frag = rb_entry(next, struct jffs2_node_frag, rb);
|
|
|
|
JFFS2_DBG_FRAGTREE2("considering frag %#04x-%#04x (%p). left %p, right %p\n",
|
|
frag->ofs, frag->ofs+frag->size, frag, frag->rb.rb_left, frag->rb.rb_right);
|
|
if (frag->ofs + frag->size <= offset) {
|
|
JFFS2_DBG_FRAGTREE2("going right from frag %#04x-%#04x, before the region we care about\n",
|
|
frag->ofs, frag->ofs+frag->size);
|
|
/* Remember the closest smaller match on the way down */
|
|
if (!prev || frag->ofs > prev->ofs)
|
|
prev = frag;
|
|
next = frag->rb.rb_right;
|
|
} else if (frag->ofs > offset) {
|
|
JFFS2_DBG_FRAGTREE2("going left from frag %#04x-%#04x, after the region we care about\n",
|
|
frag->ofs, frag->ofs+frag->size);
|
|
next = frag->rb.rb_left;
|
|
} else {
|
|
JFFS2_DBG_FRAGTREE2("returning frag %#04x-%#04x, matched\n",
|
|
frag->ofs, frag->ofs+frag->size);
|
|
return frag;
|
|
}
|
|
}
|
|
|
|
/* Exact match not found. Go back up looking at each parent,
|
|
and return the closest smaller one */
|
|
|
|
if (prev)
|
|
JFFS2_DBG_FRAGTREE2("no match. Returning frag %#04x-%#04x, closest previous\n",
|
|
prev->ofs, prev->ofs+prev->size);
|
|
else
|
|
JFFS2_DBG_FRAGTREE2("returning NULL, empty fragtree\n");
|
|
|
|
return prev;
|
|
}
|
|
|
|
/* Pass 'c' argument to indicate that nodes should be marked obsolete as
|
|
they're killed. */
|
|
void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c)
|
|
{
|
|
struct jffs2_node_frag *frag;
|
|
struct jffs2_node_frag *parent;
|
|
|
|
if (!root->rb_node)
|
|
return;
|
|
|
|
JFFS2_DBG_FRAGTREE("killing\n");
|
|
|
|
frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb));
|
|
while(frag) {
|
|
if (frag->rb.rb_left) {
|
|
JFFS2_DBG_FRAGTREE2("going left from frag (%p) %#04x-%#04x\n",
|
|
frag, frag->ofs, frag->ofs+frag->size);
|
|
frag = frag_left(frag);
|
|
continue;
|
|
}
|
|
if (frag->rb.rb_right) {
|
|
JFFS2_DBG_FRAGTREE2("going right from frag (%p) %#04x-%#04x\n",
|
|
frag, frag->ofs, frag->ofs+frag->size);
|
|
frag = frag_right(frag);
|
|
continue;
|
|
}
|
|
|
|
JFFS2_DBG_FRAGTREE2("frag %#04x-%#04x: node %p, frags %d\n",
|
|
frag->ofs, frag->ofs+frag->size, frag->node, frag->node?frag->node->frags:0);
|
|
|
|
if (frag->node && !(--frag->node->frags)) {
|
|
/* Not a hole, and it's the final remaining frag
|
|
of this node. Free the node */
|
|
if (c)
|
|
jffs2_mark_node_obsolete(c, frag->node->raw);
|
|
|
|
jffs2_free_full_dnode(frag->node);
|
|
}
|
|
parent = frag_parent(frag);
|
|
if (parent) {
|
|
if (frag_left(parent) == frag)
|
|
parent->rb.rb_left = NULL;
|
|
else
|
|
parent->rb.rb_right = NULL;
|
|
}
|
|
|
|
jffs2_free_node_frag(frag);
|
|
frag = parent;
|
|
|
|
cond_resched();
|
|
}
|
|
}
|