1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
681 lines
22 KiB
C
681 lines
22 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 1.90 2004/12/08 17:59:20 dwmw2 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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D1(printk(KERN_DEBUG "jffs2_add_fd_to_list( %p, %p (->%p))\n", new, list, *list));
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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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D1(printk(KERN_DEBUG "Eep! Marking new dirent node obsolete\n"));
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D1(printk(KERN_DEBUG "New dirent is \"%s\"->ino #%u. Old is \"%s\"->ino #%u\n", new->name, new->ino, (*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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D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) obsolete\n", (*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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goto out;
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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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out:
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D2(while(*list) {
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printk(KERN_DEBUG "Dirent \"%s\" (hash 0x%08x, ino #%u\n", (*list)->name, (*list)->nhash, (*list)->ino);
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list = &(*list)->next;
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});
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}
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/* Put a new tmp_dnode_info into the list, keeping the list in
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order of increasing version
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*/
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static void jffs2_add_tn_to_list(struct jffs2_tmp_dnode_info *tn, struct jffs2_tmp_dnode_info **list)
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{
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struct jffs2_tmp_dnode_info **prev = list;
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while ((*prev) && (*prev)->version < tn->version) {
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prev = &((*prev)->next);
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}
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tn->next = (*prev);
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*prev = tn;
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}
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static void jffs2_free_tmp_dnode_info_list(struct jffs2_tmp_dnode_info *tn)
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{
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struct jffs2_tmp_dnode_info *next;
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while (tn) {
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next = tn;
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tn = tn->next;
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jffs2_free_full_dnode(next->fn);
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jffs2_free_tmp_dnode_info(next);
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}
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}
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static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd)
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{
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struct jffs2_full_dirent *next;
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while (fd) {
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next = fd->next;
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jffs2_free_full_dirent(fd);
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fd = next;
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}
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}
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/* Returns first valid node after 'ref'. May return 'ref' */
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static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref)
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{
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while (ref && ref->next_in_ino) {
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if (!ref_obsolete(ref))
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return ref;
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D1(printk(KERN_DEBUG "node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref)));
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ref = ref->next_in_ino;
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}
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return NULL;
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}
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/* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated
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with this ino, returning the former in order of version */
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int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_tmp_dnode_info **tnp, struct jffs2_full_dirent **fdp,
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uint32_t *highest_version, uint32_t *latest_mctime,
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uint32_t *mctime_ver)
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{
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struct jffs2_raw_node_ref *ref, *valid_ref;
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struct jffs2_tmp_dnode_info *tn, *ret_tn = NULL;
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struct jffs2_full_dirent *fd, *ret_fd = NULL;
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union jffs2_node_union node;
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size_t retlen;
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int err;
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*mctime_ver = 0;
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D1(printk(KERN_DEBUG "jffs2_get_inode_nodes(): ino #%u\n", f->inocache->ino));
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spin_lock(&c->erase_completion_lock);
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valid_ref = jffs2_first_valid_node(f->inocache->nodes);
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if (!valid_ref)
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printk(KERN_WARNING "Eep. No valid nodes for ino #%u\n", f->inocache->ino);
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while (valid_ref) {
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/* We can hold a pointer to a non-obsolete node without the spinlock,
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but _obsolete_ nodes may disappear at any time, if the block
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they're in gets erased. So if we mark 'ref' obsolete while we're
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not holding the lock, it can go away immediately. For that reason,
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we find the next valid node first, before processing 'ref'.
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*/
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ref = valid_ref;
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valid_ref = jffs2_first_valid_node(ref->next_in_ino);
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spin_unlock(&c->erase_completion_lock);
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cond_resched();
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/* FIXME: point() */
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err = jffs2_flash_read(c, (ref_offset(ref)),
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min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)),
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&retlen, (void *)&node);
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if (err) {
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printk(KERN_WARNING "error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref));
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goto free_out;
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}
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/* Check we've managed to read at least the common node header */
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if (retlen < min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node.u))) {
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printk(KERN_WARNING "short read in get_inode_nodes()\n");
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err = -EIO;
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goto free_out;
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}
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switch (je16_to_cpu(node.u.nodetype)) {
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case JFFS2_NODETYPE_DIRENT:
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D1(printk(KERN_DEBUG "Node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref)));
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if (ref_flags(ref) == REF_UNCHECKED) {
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printk(KERN_WARNING "BUG: Dirent node at 0x%08x never got checked? How?\n", ref_offset(ref));
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BUG();
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}
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if (retlen < sizeof(node.d)) {
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printk(KERN_WARNING "short read in get_inode_nodes()\n");
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err = -EIO;
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goto free_out;
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}
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/* sanity check */
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if (PAD((node.d.nsize + sizeof (node.d))) != PAD(je32_to_cpu (node.d.totlen))) {
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printk(KERN_NOTICE "jffs2_get_inode_nodes(): Illegal nsize in node at 0x%08x: nsize 0x%02x, totlen %04x\n",
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ref_offset(ref), node.d.nsize, je32_to_cpu(node.d.totlen));
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jffs2_mark_node_obsolete(c, ref);
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spin_lock(&c->erase_completion_lock);
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continue;
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}
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if (je32_to_cpu(node.d.version) > *highest_version)
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*highest_version = je32_to_cpu(node.d.version);
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if (ref_obsolete(ref)) {
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/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
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printk(KERN_ERR "Dirent node at 0x%08x became obsolete while we weren't looking\n",
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ref_offset(ref));
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BUG();
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}
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fd = jffs2_alloc_full_dirent(node.d.nsize+1);
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if (!fd) {
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err = -ENOMEM;
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goto free_out;
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}
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fd->raw = ref;
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fd->version = je32_to_cpu(node.d.version);
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fd->ino = je32_to_cpu(node.d.ino);
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fd->type = node.d.type;
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/* Pick out the mctime of the latest dirent */
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if(fd->version > *mctime_ver) {
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*mctime_ver = fd->version;
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*latest_mctime = je32_to_cpu(node.d.mctime);
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}
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/* memcpy as much of the name as possible from the raw
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dirent we've already read from the flash
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*/
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if (retlen > sizeof(struct jffs2_raw_dirent))
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memcpy(&fd->name[0], &node.d.name[0], min_t(uint32_t, node.d.nsize, (retlen-sizeof(struct jffs2_raw_dirent))));
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/* Do we need to copy any more of the name directly
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from the flash?
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*/
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if (node.d.nsize + sizeof(struct jffs2_raw_dirent) > retlen) {
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/* FIXME: point() */
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int already = retlen - sizeof(struct jffs2_raw_dirent);
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err = jffs2_flash_read(c, (ref_offset(ref)) + retlen,
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node.d.nsize - already, &retlen, &fd->name[already]);
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if (!err && retlen != node.d.nsize - already)
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err = -EIO;
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if (err) {
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printk(KERN_WARNING "Read remainder of name in jffs2_get_inode_nodes(): error %d\n", err);
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jffs2_free_full_dirent(fd);
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goto free_out;
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}
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}
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fd->nhash = full_name_hash(fd->name, node.d.nsize);
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fd->next = NULL;
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fd->name[node.d.nsize] = '\0';
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/* Wheee. We now have a complete jffs2_full_dirent structure, with
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the name in it and everything. Link it into the list
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*/
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D1(printk(KERN_DEBUG "Adding fd \"%s\", ino #%u\n", fd->name, fd->ino));
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jffs2_add_fd_to_list(c, fd, &ret_fd);
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break;
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case JFFS2_NODETYPE_INODE:
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D1(printk(KERN_DEBUG "Node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref)));
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if (retlen < sizeof(node.i)) {
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printk(KERN_WARNING "read too short for dnode\n");
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err = -EIO;
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goto free_out;
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}
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if (je32_to_cpu(node.i.version) > *highest_version)
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*highest_version = je32_to_cpu(node.i.version);
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D1(printk(KERN_DEBUG "version %d, highest_version now %d\n", je32_to_cpu(node.i.version), *highest_version));
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if (ref_obsolete(ref)) {
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/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
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printk(KERN_ERR "Inode node at 0x%08x became obsolete while we weren't looking\n",
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ref_offset(ref));
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BUG();
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}
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/* If we've never checked the CRCs on this node, check them now. */
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if (ref_flags(ref) == REF_UNCHECKED) {
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uint32_t crc, len;
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struct jffs2_eraseblock *jeb;
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crc = crc32(0, &node, sizeof(node.i)-8);
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if (crc != je32_to_cpu(node.i.node_crc)) {
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printk(KERN_NOTICE "jffs2_get_inode_nodes(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
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ref_offset(ref), je32_to_cpu(node.i.node_crc), crc);
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jffs2_mark_node_obsolete(c, ref);
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spin_lock(&c->erase_completion_lock);
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continue;
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}
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/* sanity checks */
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if ( je32_to_cpu(node.i.offset) > je32_to_cpu(node.i.isize) ||
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PAD(je32_to_cpu(node.i.csize) + sizeof (node.i)) != PAD(je32_to_cpu(node.i.totlen))) {
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printk(KERN_NOTICE "jffs2_get_inode_nodes(): Inode corrupted at 0x%08x, totlen %d, #ino %d, version %d, isize %d, csize %d, dsize %d \n",
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ref_offset(ref), je32_to_cpu(node.i.totlen), je32_to_cpu(node.i.ino),
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je32_to_cpu(node.i.version), je32_to_cpu(node.i.isize),
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je32_to_cpu(node.i.csize), je32_to_cpu(node.i.dsize));
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jffs2_mark_node_obsolete(c, ref);
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spin_lock(&c->erase_completion_lock);
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continue;
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}
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if (node.i.compr != JFFS2_COMPR_ZERO && je32_to_cpu(node.i.csize)) {
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unsigned char *buf=NULL;
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uint32_t pointed = 0;
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#ifndef __ECOS
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if (c->mtd->point) {
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err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
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&retlen, &buf);
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if (!err && retlen < je32_to_cpu(node.i.csize)) {
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D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
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c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
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} else if (err){
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D1(printk(KERN_DEBUG "MTD point failed %d\n", err));
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} else
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pointed = 1; /* succefully pointed to device */
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}
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#endif
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if(!pointed){
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buf = kmalloc(je32_to_cpu(node.i.csize), GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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err = jffs2_flash_read(c, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
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&retlen, buf);
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if (!err && retlen != je32_to_cpu(node.i.csize))
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err = -EIO;
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if (err) {
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kfree(buf);
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return err;
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}
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}
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crc = crc32(0, buf, je32_to_cpu(node.i.csize));
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if(!pointed)
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kfree(buf);
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#ifndef __ECOS
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else
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c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
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#endif
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if (crc != je32_to_cpu(node.i.data_crc)) {
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printk(KERN_NOTICE "jffs2_get_inode_nodes(): Data CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
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ref_offset(ref), je32_to_cpu(node.i.data_crc), crc);
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jffs2_mark_node_obsolete(c, ref);
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spin_lock(&c->erase_completion_lock);
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continue;
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}
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}
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/* Mark the node as having been checked and fix the accounting accordingly */
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spin_lock(&c->erase_completion_lock);
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jeb = &c->blocks[ref->flash_offset / c->sector_size];
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len = ref_totlen(c, jeb, ref);
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jeb->used_size += len;
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jeb->unchecked_size -= len;
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c->used_size += len;
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c->unchecked_size -= len;
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/* If node covers at least a whole page, or if it starts at the
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beginning of a page and runs to the end of the file, or if
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it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
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If it's actually overlapped, it'll get made NORMAL (or OBSOLETE)
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when the overlapping node(s) get added to the tree anyway.
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*/
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if ((je32_to_cpu(node.i.dsize) >= PAGE_CACHE_SIZE) ||
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( ((je32_to_cpu(node.i.offset)&(PAGE_CACHE_SIZE-1))==0) &&
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(je32_to_cpu(node.i.dsize)+je32_to_cpu(node.i.offset) == je32_to_cpu(node.i.isize)))) {
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D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_PRISTINE\n", ref_offset(ref)));
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ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
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} else {
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D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_NORMAL\n", ref_offset(ref)));
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ref->flash_offset = ref_offset(ref) | REF_NORMAL;
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}
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spin_unlock(&c->erase_completion_lock);
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}
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tn = jffs2_alloc_tmp_dnode_info();
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if (!tn) {
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D1(printk(KERN_DEBUG "alloc tn failed\n"));
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err = -ENOMEM;
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goto free_out;
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}
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tn->fn = jffs2_alloc_full_dnode();
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if (!tn->fn) {
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D1(printk(KERN_DEBUG "alloc fn failed\n"));
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err = -ENOMEM;
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jffs2_free_tmp_dnode_info(tn);
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goto free_out;
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}
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tn->version = je32_to_cpu(node.i.version);
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tn->fn->ofs = je32_to_cpu(node.i.offset);
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/* There was a bug where we wrote hole nodes out with
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csize/dsize swapped. Deal with it */
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if (node.i.compr == JFFS2_COMPR_ZERO && !je32_to_cpu(node.i.dsize) && je32_to_cpu(node.i.csize))
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tn->fn->size = je32_to_cpu(node.i.csize);
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else // normal case...
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tn->fn->size = je32_to_cpu(node.i.dsize);
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tn->fn->raw = ref;
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D1(printk(KERN_DEBUG "dnode @%08x: ver %u, offset %04x, dsize %04x\n",
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ref_offset(ref), je32_to_cpu(node.i.version),
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je32_to_cpu(node.i.offset), je32_to_cpu(node.i.dsize)));
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jffs2_add_tn_to_list(tn, &ret_tn);
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break;
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default:
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if (ref_flags(ref) == REF_UNCHECKED) {
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struct jffs2_eraseblock *jeb;
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uint32_t len;
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printk(KERN_ERR "Eep. Unknown node type %04x at %08x was marked REF_UNCHECKED\n",
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je16_to_cpu(node.u.nodetype), ref_offset(ref));
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/* Mark the node as having been checked and fix the accounting accordingly */
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spin_lock(&c->erase_completion_lock);
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jeb = &c->blocks[ref->flash_offset / c->sector_size];
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len = ref_totlen(c, jeb, ref);
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jeb->used_size += len;
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jeb->unchecked_size -= len;
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c->used_size += len;
|
|
c->unchecked_size -= len;
|
|
|
|
mark_ref_normal(ref);
|
|
spin_unlock(&c->erase_completion_lock);
|
|
}
|
|
node.u.nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(node.u.nodetype));
|
|
if (crc32(0, &node, sizeof(struct jffs2_unknown_node)-4) != je32_to_cpu(node.u.hdr_crc)) {
|
|
/* Hmmm. This should have been caught at scan time. */
|
|
printk(KERN_ERR "Node header CRC failed at %08x. But it must have been OK earlier.\n",
|
|
ref_offset(ref));
|
|
printk(KERN_ERR "Node was: { %04x, %04x, %08x, %08x }\n",
|
|
je16_to_cpu(node.u.magic), je16_to_cpu(node.u.nodetype), je32_to_cpu(node.u.totlen),
|
|
je32_to_cpu(node.u.hdr_crc));
|
|
jffs2_mark_node_obsolete(c, ref);
|
|
} else switch(je16_to_cpu(node.u.nodetype) & JFFS2_COMPAT_MASK) {
|
|
case JFFS2_FEATURE_INCOMPAT:
|
|
printk(KERN_NOTICE "Unknown INCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
|
|
/* EEP */
|
|
BUG();
|
|
break;
|
|
case JFFS2_FEATURE_ROCOMPAT:
|
|
printk(KERN_NOTICE "Unknown ROCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
|
|
if (!(c->flags & JFFS2_SB_FLAG_RO))
|
|
BUG();
|
|
break;
|
|
case JFFS2_FEATURE_RWCOMPAT_COPY:
|
|
printk(KERN_NOTICE "Unknown RWCOMPAT_COPY nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
|
|
break;
|
|
case JFFS2_FEATURE_RWCOMPAT_DELETE:
|
|
printk(KERN_NOTICE "Unknown RWCOMPAT_DELETE nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
|
|
jffs2_mark_node_obsolete(c, ref);
|
|
break;
|
|
}
|
|
|
|
}
|
|
spin_lock(&c->erase_completion_lock);
|
|
|
|
}
|
|
spin_unlock(&c->erase_completion_lock);
|
|
*tnp = ret_tn;
|
|
*fdp = ret_fd;
|
|
|
|
return 0;
|
|
|
|
free_out:
|
|
jffs2_free_tmp_dnode_info_list(ret_tn);
|
|
jffs2_free_full_dirent_list(ret_fd);
|
|
return err;
|
|
}
|
|
|
|
void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state)
|
|
{
|
|
spin_lock(&c->inocache_lock);
|
|
ic->state = state;
|
|
wake_up(&c->inocache_wq);
|
|
spin_unlock(&c->inocache_lock);
|
|
}
|
|
|
|
/* During mount, this needs no locking. During normal operation, its
|
|
callers want to do other stuff while still holding the inocache_lock.
|
|
Rather than introducing special case get_ino_cache functions or
|
|
callbacks, we just let the caller do the locking itself. */
|
|
|
|
struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
|
|
{
|
|
struct jffs2_inode_cache *ret;
|
|
|
|
D2(printk(KERN_DEBUG "jffs2_get_ino_cache(): ino %u\n", ino));
|
|
|
|
ret = c->inocache_list[ino % INOCACHE_HASHSIZE];
|
|
while (ret && ret->ino < ino) {
|
|
ret = ret->next;
|
|
}
|
|
|
|
if (ret && ret->ino != ino)
|
|
ret = NULL;
|
|
|
|
D2(printk(KERN_DEBUG "jffs2_get_ino_cache found %p for ino %u\n", ret, ino));
|
|
return ret;
|
|
}
|
|
|
|
void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new)
|
|
{
|
|
struct jffs2_inode_cache **prev;
|
|
D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino));
|
|
spin_lock(&c->inocache_lock);
|
|
|
|
prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE];
|
|
|
|
while ((*prev) && (*prev)->ino < new->ino) {
|
|
prev = &(*prev)->next;
|
|
}
|
|
new->next = *prev;
|
|
*prev = new;
|
|
|
|
spin_unlock(&c->inocache_lock);
|
|
}
|
|
|
|
void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old)
|
|
{
|
|
struct jffs2_inode_cache **prev;
|
|
D2(printk(KERN_DEBUG "jffs2_del_ino_cache: Del %p (ino #%u)\n", old, old->ino));
|
|
spin_lock(&c->inocache_lock);
|
|
|
|
prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE];
|
|
|
|
while ((*prev) && (*prev)->ino < old->ino) {
|
|
prev = &(*prev)->next;
|
|
}
|
|
if ((*prev) == old) {
|
|
*prev = old->next;
|
|
}
|
|
|
|
spin_unlock(&c->inocache_lock);
|
|
}
|
|
|
|
void jffs2_free_ino_caches(struct jffs2_sb_info *c)
|
|
{
|
|
int i;
|
|
struct jffs2_inode_cache *this, *next;
|
|
|
|
for (i=0; i<INOCACHE_HASHSIZE; i++) {
|
|
this = c->inocache_list[i];
|
|
while (this) {
|
|
next = this->next;
|
|
D2(printk(KERN_DEBUG "jffs2_free_ino_caches: Freeing ino #%u at %p\n", this->ino, this));
|
|
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;
|
|
|
|
D2(printk(KERN_DEBUG "jffs2_lookup_node_frag(%p, %d)\n", fragtree, offset));
|
|
|
|
next = fragtree->rb_node;
|
|
|
|
while(next) {
|
|
frag = rb_entry(next, struct jffs2_node_frag, rb);
|
|
|
|
D2(printk(KERN_DEBUG "Considering frag %d-%d (%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) {
|
|
D2(printk(KERN_DEBUG "Going right from frag %d-%d, 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) {
|
|
D2(printk(KERN_DEBUG "Going left from frag %d-%d, after the region we care about\n",
|
|
frag->ofs, frag->ofs+frag->size));
|
|
next = frag->rb.rb_left;
|
|
} else {
|
|
D2(printk(KERN_DEBUG "Returning frag %d,%d, 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)
|
|
D2(printk(KERN_DEBUG "No match. Returning frag %d,%d, closest previous\n",
|
|
prev->ofs, prev->ofs+prev->size));
|
|
else
|
|
D2(printk(KERN_DEBUG "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;
|
|
|
|
frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb));
|
|
|
|
while(frag) {
|
|
if (frag->rb.rb_left) {
|
|
D2(printk(KERN_DEBUG "Going left from frag (%p) %d-%d\n",
|
|
frag, frag->ofs, frag->ofs+frag->size));
|
|
frag = frag_left(frag);
|
|
continue;
|
|
}
|
|
if (frag->rb.rb_right) {
|
|
D2(printk(KERN_DEBUG "Going right from frag (%p) %d-%d\n",
|
|
frag, frag->ofs, frag->ofs+frag->size));
|
|
frag = frag_right(frag);
|
|
continue;
|
|
}
|
|
|
|
D2(printk(KERN_DEBUG "jffs2_kill_fragtree: frag at 0x%x-0x%x: 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();
|
|
}
|
|
}
|
|
|
|
void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base)
|
|
{
|
|
struct rb_node *parent = &base->rb;
|
|
struct rb_node **link = &parent;
|
|
|
|
D2(printk(KERN_DEBUG "jffs2_fragtree_insert(%p; %d-%d, %p)\n", newfrag,
|
|
newfrag->ofs, newfrag->ofs+newfrag->size, base));
|
|
|
|
while (*link) {
|
|
parent = *link;
|
|
base = rb_entry(parent, struct jffs2_node_frag, rb);
|
|
|
|
D2(printk(KERN_DEBUG "fragtree_insert considering frag at 0x%x\n", base->ofs));
|
|
if (newfrag->ofs > base->ofs)
|
|
link = &base->rb.rb_right;
|
|
else if (newfrag->ofs < base->ofs)
|
|
link = &base->rb.rb_left;
|
|
else {
|
|
printk(KERN_CRIT "Duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
rb_link_node(&newfrag->rb, &base->rb, link);
|
|
}
|