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linux/fs/jffs2/nodelist.c

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/*
* 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 Marking new dirent node is obsolete, old is \"%s\", ino #%u\n",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->node->frags);
mark_ref_normal(this->node->raw);
}
}
jffs2_free_node_frag(this);
}
static 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;
dbg_fragtree2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size);
while (*link) {
parent = *link;
base = rb_entry(parent, struct jffs2_node_frag, rb);
if (newfrag->ofs > base->ofs)
link = &base->rb.rb_right;
else if (newfrag->ofs < base->ofs)
link = &base->rb.rb_left;
else {
JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
BUG();
}
}
rb_link_node(&newfrag->rb, &base->rb, link);
}
/*
* Allocate and initializes a new fragment.
*/
static struct jffs2_node_frag * new_fragment(struct jffs2_full_dnode *fn, uint32_t ofs, uint32_t size)
{
struct jffs2_node_frag *newfrag;
newfrag = jffs2_alloc_node_frag();
if (likely(newfrag)) {
newfrag->ofs = ofs;
newfrag->size = size;
newfrag->node = fn;
} else {
JFFS2_ERROR("cannot allocate a jffs2_node_frag object\n");
}
return newfrag;
}
/*
* Called when there is no overlapping fragment exist. Inserts a hole before the new
* fragment and inserts the new fragment to the fragtree.
*/
static int no_overlapping_node(struct jffs2_sb_info *c, struct rb_root *root,
struct jffs2_node_frag *newfrag,
struct jffs2_node_frag *this, uint32_t lastend)
{
if (lastend < newfrag->node->ofs) {
/* put a hole in before the new fragment */
struct jffs2_node_frag *holefrag;
holefrag= new_fragment(NULL, lastend, newfrag->node->ofs - lastend);
if (unlikely(!holefrag)) {
jffs2_free_node_frag(newfrag);
return -ENOMEM;
}
if (this) {
/* By definition, the 'this' node has no right-hand child,
because there are no frags with offset greater than it.
So that's where we want to put the hole */
dbg_fragtree2("add hole frag %#04x-%#04x on the right of the new frag.\n",
holefrag->ofs, holefrag->ofs + holefrag->size);
rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right);
} else {
dbg_fragtree2("Add hole frag %#04x-%#04x to the root of the tree.\n",
holefrag->ofs, holefrag->ofs + holefrag->size);
rb_link_node(&holefrag->rb, NULL, &root->rb_node);
}
rb_insert_color(&holefrag->rb, root);
this = holefrag;
}
if (this) {
/* By definition, the 'this' node has no right-hand child,
because there are no frags with offset greater than it.
So that's where we want to put new fragment */
dbg_fragtree2("add the new node at the right\n");
rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
} else {
dbg_fragtree2("insert the new node at the root of the tree\n");
rb_link_node(&newfrag->rb, NULL, &root->rb_node);
}
rb_insert_color(&newfrag->rb, root);
return 0;
}
/* Doesn't set inode->i_size */
static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *root, struct jffs2_node_frag *newfrag)
{
struct jffs2_node_frag *this;
uint32_t lastend;
/* Skip all the nodes which are completed before this one starts */
this = jffs2_lookup_node_frag(root, newfrag->node->ofs);
if (this) {
dbg_fragtree2("lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",
this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this);
lastend = this->ofs + this->size;
} else {
dbg_fragtree2("lookup gave no frag\n");
lastend = 0;
}
/* See if we ran off the end of the fragtree */
if (lastend <= newfrag->ofs) {
/* We did */
/* Check if 'this' node was on the same page as the new node.
If so, both 'this' and the new node get marked REF_NORMAL so
the GC can take a look.
*/
if (lastend && (lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) {
if (this->node)
mark_ref_normal(this->node->raw);
mark_ref_normal(newfrag->node->raw);
}
return no_overlapping_node(c, root, newfrag, this, lastend);
}
if (this->node)
dbg_fragtree2("dealing with frag %u-%u, phys %#08x(%d).\n",
this->ofs, this->ofs + this->size,
ref_offset(this->node->raw), ref_flags(this->node->raw));
else
dbg_fragtree2("dealing with hole frag %u-%u.\n",
this->ofs, this->ofs + this->size);
/* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes,
* - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs
*/
if (newfrag->ofs > this->ofs) {
/* This node isn't completely obsoleted. The start of it remains valid */
/* Mark the new node and the partially covered node REF_NORMAL -- let
the GC take a look at them */
mark_ref_normal(newfrag->node->raw);
if (this->node)
mark_ref_normal(this->node->raw);
if (this->ofs + this->size > newfrag->ofs + newfrag->size) {
/* The new node splits 'this' frag into two */
struct jffs2_node_frag *newfrag2;
if (this->node)
dbg_fragtree2("split old frag 0x%04x-0x%04x, phys 0x%08x\n",
this->ofs, this->ofs+this->size, ref_offset(this->node->raw));
else
dbg_fragtree2("split old hole frag 0x%04x-0x%04x\n",
this->ofs, this->ofs+this->size);
/* New second frag pointing to this's node */
newfrag2 = new_fragment(this->node, newfrag->ofs + newfrag->size,
this->ofs + this->size - newfrag->ofs - newfrag->size);
if (unlikely(!newfrag2))
return -ENOMEM;
if (this->node)
this->node->frags++;
/* Adjust size of original 'this' */
this->size = newfrag->ofs - this->ofs;
/* Now, we know there's no node with offset
greater than this->ofs but smaller than
newfrag2->ofs or newfrag->ofs, for obvious
reasons. So we can do a tree insert from
'this' to insert newfrag, and a tree insert
from newfrag to insert newfrag2. */
jffs2_fragtree_insert(newfrag, this);
rb_insert_color(&newfrag->rb, root);
jffs2_fragtree_insert(newfrag2, newfrag);
rb_insert_color(&newfrag2->rb, root);
return 0;
}
/* New node just reduces 'this' frag in size, doesn't split it */
this->size = newfrag->ofs - this->ofs;
/* Again, we know it lives down here in the tree */
jffs2_fragtree_insert(newfrag, this);
rb_insert_color(&newfrag->rb, root);
} else {
/* New frag starts at the same point as 'this' used to. Replace
it in the tree without doing a delete and insertion */
dbg_fragtree2("inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n",
newfrag, newfrag->ofs, newfrag->ofs+newfrag->size, this, this->ofs, this->ofs+this->size);
rb_replace_node(&this->rb, &newfrag->rb, root);
if (newfrag->ofs + newfrag->size >= this->ofs+this->size) {
dbg_fragtree2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size);
jffs2_obsolete_node_frag(c, this);
} else {
this->ofs += newfrag->size;
this->size -= newfrag->size;
jffs2_fragtree_insert(this, newfrag);
rb_insert_color(&this->rb, root);
return 0;
}
}
/* OK, now we have newfrag added in the correct place in the tree, but
frag_next(newfrag) may be a fragment which is overlapped by it
*/
while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) {
/* 'this' frag is obsoleted completely. */
dbg_fragtree2("obsoleting node frag %p (%x-%x) and removing from tree\n",
this, this->ofs, this->ofs+this->size);
rb_erase(&this->rb, root);
jffs2_obsolete_node_frag(c, this);
}
/* Now we're pointing at the first frag which isn't totally obsoleted by
the new frag */
if (!this || newfrag->ofs + newfrag->size == this->ofs)
return 0;
/* Still some overlap but we don't need to move it in the tree */
this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size);
this->ofs = newfrag->ofs + newfrag->size;
/* And mark them REF_NORMAL so the GC takes a look at them */
if (this->node)
mark_ref_normal(this->node->raw);
mark_ref_normal(newfrag->node->raw);
return 0;
}
/*
* Given an inode, probably with existing tree of fragments, add the new node
* to the fragment tree.
*/
int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn)
{
int ret;
struct jffs2_node_frag *newfrag;
if (unlikely(!fn->size))
return 0;
newfrag = new_fragment(fn, fn->ofs, fn->size);
if (unlikely(!newfrag))
return -ENOMEM;
newfrag->node->frags = 1;
dbg_fragtree("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n",
fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag);
ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag);
if (unlikely(ret))
return ret;
/* If we now share a page with other nodes, mark either previous
or next node REF_NORMAL, as appropriate. */
if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) {
struct jffs2_node_frag *prev = frag_prev(newfrag);
mark_ref_normal(fn->raw);
/* If we don't start at zero there's _always_ a previous */
if (prev->node)
mark_ref_normal(prev->node->raw);
}
if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) {
struct jffs2_node_frag *next = frag_next(newfrag);
if (next) {
mark_ref_normal(fn->raw);
if (next->node)
mark_ref_normal(next->node->raw);
}
}
jffs2_dbg_fragtree_paranoia_check_nolock(f);
return 0;
}
/*
* Check the data CRC of the node.
*
* Returns: 0 if the data CRC is correct;
* 1 - if incorrect;
* error code if an error occured.
*/
static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn)
{
struct jffs2_raw_node_ref *ref = tn->fn->raw;
int err = 0, pointed = 0;
struct jffs2_eraseblock *jeb;
unsigned char *buffer;
uint32_t crc, ofs, len;
size_t retlen;
BUG_ON(tn->csize == 0);
if (!jffs2_is_writebuffered(c))
goto adj_acc;
/* Calculate how many bytes were already checked */
ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode);
len = ofs % c->wbuf_pagesize;
if (likely(len))
len = c->wbuf_pagesize - len;
if (len >= tn->csize) {
dbg_readinode("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n",
ref_offset(ref), tn->csize, ofs);
goto adj_acc;
}
ofs += len;
len = tn->csize - len;
dbg_readinode("check node at %#08x, data length %u, partial CRC %#08x, correct CRC %#08x, data starts at %#08x, start checking from %#08x - %u bytes.\n",
ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len);
#ifndef __ECOS
/* TODO: instead, incapsulate point() stuff to jffs2_flash_read(),
* adding and jffs2_flash_read_end() interface. */
if (c->mtd->point) {
err = c->mtd->point(c->mtd, ofs, len, &retlen, &buffer);
if (!err && retlen < tn->csize) {
JFFS2_WARNING("MTD point returned len too short: %zu instead of %u.\n", retlen, tn->csize);
c->mtd->unpoint(c->mtd, buffer, ofs, len);
} else if (err)
JFFS2_WARNING("MTD point failed: error code %d.\n", err);
else
pointed = 1; /* succefully pointed to device */
}
#endif
if (!pointed) {
buffer = kmalloc(len, GFP_KERNEL);
if (unlikely(!buffer))
return -ENOMEM;
/* TODO: this is very frequent pattern, make it a separate
* routine */
err = jffs2_flash_read(c, ofs, len, &retlen, buffer);
if (err) {
JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err);
goto free_out;
}
if (retlen != len) {
JFFS2_ERROR("short read at %#08x: %zd instead of %d.\n", ofs, retlen, len);
err = -EIO;
goto free_out;
}
}
/* Continue calculating CRC */
crc = crc32(tn->partial_crc, buffer, len);
if(!pointed)
kfree(buffer);
#ifndef __ECOS
else
c->mtd->unpoint(c->mtd, buffer, ofs, len);
#endif
if (crc != tn->data_crc) {
JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n",
ofs, tn->data_crc, crc);
return 1;
}
adj_acc:
jeb = &c->blocks[ref->flash_offset / c->sector_size];
len = ref_totlen(c, jeb, ref);
/*
* Mark the node as having been checked and fix the
* accounting accordingly.
*/
spin_lock(&c->erase_completion_lock);
jeb->used_size += len;
jeb->unchecked_size -= len;
c->used_size += len;
c->unchecked_size -= len;
spin_unlock(&c->erase_completion_lock);
return 0;
free_out:
if(!pointed)
kfree(buffer);
#ifndef __ECOS
else
c->mtd->unpoint(c->mtd, buffer, ofs, len);
#endif
return err;
}
/*
* Helper function for jffs2_add_older_frag_to_fragtree().
*
* Checks the node if we are in the checking stage.
*/
static int check_node(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn)
{
int ret;
BUG_ON(ref_obsolete(tn->fn->raw));
/* We only check the data CRC of unchecked nodes */
if (ref_flags(tn->fn->raw) != REF_UNCHECKED)
return 0;
dbg_fragtree2("check node %#04x-%#04x, phys offs %#08x.\n",
tn->fn->ofs, tn->fn->ofs + tn->fn->size, ref_offset(tn->fn->raw));
ret = check_node_data(c, tn);
if (unlikely(ret < 0)) {
JFFS2_ERROR("check_node_data() returned error: %d.\n",
ret);
} else if (unlikely(ret > 0)) {
dbg_fragtree2("CRC error, mark it obsolete.\n");
jffs2_mark_node_obsolete(c, tn->fn->raw);
}
return ret;
}
/*
* Helper function for jffs2_add_older_frag_to_fragtree().
*
* Called when the new fragment that is being inserted
* splits a hole fragment.
*/
static int split_hole(struct jffs2_sb_info *c, struct rb_root *root,
struct jffs2_node_frag *newfrag, struct jffs2_node_frag *hole)
{
dbg_fragtree2("fragment %#04x-%#04x splits the hole %#04x-%#04x\n",
newfrag->ofs, newfrag->ofs + newfrag->size, hole->ofs, hole->ofs + hole->size);
if (hole->ofs == newfrag->ofs) {
/*
* Well, the new fragment actually starts at the same offset as
* the hole.
*/
if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) {
/*
* We replace the overlapped left part of the hole by
* the new node.
*/
dbg_fragtree2("insert fragment %#04x-%#04x and cut the left part of the hole\n",
newfrag->ofs, newfrag->ofs + newfrag->size);
rb_replace_node(&hole->rb, &newfrag->rb, root);
hole->ofs += newfrag->size;
hole->size -= newfrag->size;
/*
* We know that 'hole' should be the right hand
* fragment.
*/
jffs2_fragtree_insert(hole, newfrag);
rb_insert_color(&hole->rb, root);
} else {
/*
* Ah, the new fragment is of the same size as the hole.
* Relace the hole by it.
*/
dbg_fragtree2("insert fragment %#04x-%#04x and overwrite hole\n",
newfrag->ofs, newfrag->ofs + newfrag->size);
rb_replace_node(&hole->rb, &newfrag->rb, root);
jffs2_free_node_frag(hole);
}
} else {
/* The new fragment lefts some hole space at the left */
struct jffs2_node_frag * newfrag2 = NULL;
if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) {
/* The new frag also lefts some space at the right */
newfrag2 = new_fragment(NULL, newfrag->ofs +
newfrag->size, hole->ofs + hole->size
- newfrag->ofs - newfrag->size);
if (unlikely(!newfrag2)) {
jffs2_free_node_frag(newfrag);
return -ENOMEM;
}
}
hole->size = newfrag->ofs - hole->ofs;
dbg_fragtree2("left the hole %#04x-%#04x at the left and inserd fragment %#04x-%#04x\n",
hole->ofs, hole->ofs + hole->size, newfrag->ofs, newfrag->ofs + newfrag->size);
jffs2_fragtree_insert(newfrag, hole);
rb_insert_color(&newfrag->rb, root);
if (newfrag2) {
dbg_fragtree2("left the hole %#04x-%#04x at the right\n",
newfrag2->ofs, newfrag2->ofs + newfrag2->size);
jffs2_fragtree_insert(newfrag2, newfrag);
rb_insert_color(&newfrag2->rb, root);
}
}
return 0;
}
/*
* This function is used when we build inode. It expects the nodes are passed
* in the decreasing version order. The whole point of this is to improve the
* inodes checking on NAND: we check the nodes' data CRC only when they are not
* obsoleted. Previously, add_frag_to_fragtree() function was used and
* nodes were passed to it in the increasing version ordes and CRCs of all
* nodes were checked.
*
* Note: tn->fn->size shouldn't be zero.
*
* Returns 0 if the node was inserted
* 1 if it wasn't inserted (since it is obsolete)
* < 0 an if error occured
*/
int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
struct jffs2_tmp_dnode_info *tn)
{
struct jffs2_node_frag *this, *newfrag;
uint32_t lastend;
struct jffs2_full_dnode *fn = tn->fn;
struct rb_root *root = &f->fragtree;
uint32_t fn_size = fn->size, fn_ofs = fn->ofs;
int err, checked = 0;
int ref_flag;
dbg_fragtree("insert fragment %#04x-%#04x, ver %u\n", fn_ofs, fn_ofs + fn_size, tn->version);
/* Skip all the nodes which are completed before this one starts */
this = jffs2_lookup_node_frag(root, fn_ofs);
if (this)
dbg_fragtree2("'this' found %#04x-%#04x (%s)\n", this->ofs, this->ofs + this->size, this->node ? "data" : "hole");
if (this)
lastend = this->ofs + this->size;
else
lastend = 0;
/* Detect the preliminary type of node */
if (fn->size >= PAGE_CACHE_SIZE)
ref_flag = REF_PRISTINE;
else
ref_flag = REF_NORMAL;
/* See if we ran off the end of the root */
if (lastend <= fn_ofs) {
/* We did */
/*
* We are going to insert the new node into the
* fragment tree, so check it.
*/
err = check_node(c, f, tn);
if (err != 0)
return err;
fn->frags = 1;
newfrag = new_fragment(fn, fn_ofs, fn_size);
if (unlikely(!newfrag))
return -ENOMEM;
err = no_overlapping_node(c, root, newfrag, this, lastend);
if (unlikely(err != 0)) {
jffs2_free_node_frag(newfrag);
return err;
}
goto out_ok;
}
fn->frags = 0;
while (1) {
/*
* Here we have:
* fn_ofs < this->ofs + this->size && fn_ofs >= this->ofs.
*
* Remember, 'this' has higher version, any non-hole node
* which is already in the fragtree is newer then the newly
* inserted.
*/
if (!this->node) {
/*
* 'this' is the hole fragment, so at least the
* beginning of the new fragment is valid.
*/
/*
* We are going to insert the new node into the
* fragment tree, so check it.
*/
if (!checked) {
err = check_node(c, f, tn);
if (unlikely(err != 0))
return err;
checked = 1;
}
if (this->ofs + this->size >= fn_ofs + fn_size) {
/* We split the hole on two parts */
fn->frags += 1;
newfrag = new_fragment(fn, fn_ofs, fn_size);
if (unlikely(!newfrag))
return -ENOMEM;
err = split_hole(c, root, newfrag, this);
if (unlikely(err))
return err;
goto out_ok;
}
/*
* The beginning of the new fragment is valid since it
* overlaps the hole node.
*/
ref_flag = REF_NORMAL;
fn->frags += 1;
newfrag = new_fragment(fn, fn_ofs,
this->ofs + this->size - fn_ofs);
if (unlikely(!newfrag))
return -ENOMEM;
if (fn_ofs == this->ofs) {
/*
* The new node starts at the same offset as
* the hole and supersieds the hole.
*/
dbg_fragtree2("add the new fragment instead of hole %#04x-%#04x, refcnt %d\n",
fn_ofs, fn_ofs + this->ofs + this->size - fn_ofs, fn->frags);
rb_replace_node(&this->rb, &newfrag->rb, root);
jffs2_free_node_frag(this);
} else {
/*
* The hole becomes shorter as its right part
* is supersieded by the new fragment.
*/
dbg_fragtree2("reduce size of hole %#04x-%#04x to %#04x-%#04x\n",
this->ofs, this->ofs + this->size, this->ofs, this->ofs + this->size - newfrag->size);
dbg_fragtree2("add new fragment %#04x-%#04x, refcnt %d\n", fn_ofs,
fn_ofs + this->ofs + this->size - fn_ofs, fn->frags);
this->size -= newfrag->size;
jffs2_fragtree_insert(newfrag, this);
rb_insert_color(&newfrag->rb, root);
}
fn_ofs += newfrag->size;
fn_size -= newfrag->size;
this = rb_entry(rb_next(&newfrag->rb),
struct jffs2_node_frag, rb);
dbg_fragtree2("switch to the next 'this' fragment: %#04x-%#04x %s\n",
this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)");
}
/*
* 'This' node is not the hole so it obsoletes the new fragment
* either fully or partially.
*/
if (this->ofs + this->size >= fn_ofs + fn_size) {
/* The new node is obsolete, drop it */
if (fn->frags == 0) {
dbg_fragtree2("%#04x-%#04x is obsolete, mark it obsolete\n", fn_ofs, fn_ofs + fn_size);
ref_flag = REF_OBSOLETE;
}
goto out_ok;
} else {
struct jffs2_node_frag *new_this;
/* 'This' node obsoletes the beginning of the new node */
dbg_fragtree2("the beginning %#04x-%#04x is obsolete\n", fn_ofs, this->ofs + this->size);
ref_flag = REF_NORMAL;
fn_size -= this->ofs + this->size - fn_ofs;
fn_ofs = this->ofs + this->size;
dbg_fragtree2("now considering %#04x-%#04x\n", fn_ofs, fn_ofs + fn_size);
new_this = rb_entry(rb_next(&this->rb), struct jffs2_node_frag, rb);
if (!new_this) {
/*
* There is no next fragment. Add the rest of
* the new node as the right-hand child.
*/
if (!checked) {
err = check_node(c, f, tn);
if (unlikely(err != 0))
return err;
checked = 1;
}
fn->frags += 1;
newfrag = new_fragment(fn, fn_ofs, fn_size);
if (unlikely(!newfrag))
return -ENOMEM;
dbg_fragtree2("there are no more fragments, insert %#04x-%#04x\n",
newfrag->ofs, newfrag->ofs + newfrag->size);
rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
rb_insert_color(&newfrag->rb, root);
goto out_ok;
} else {
this = new_this;
dbg_fragtree2("switch to the next 'this' fragment: %#04x-%#04x %s\n",
this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)");
}
}
}
out_ok:
BUG_ON(fn->size < PAGE_CACHE_SIZE && ref_flag == REF_PRISTINE);
if (ref_flag == REF_OBSOLETE) {
dbg_fragtree2("the node is obsolete now\n");
/* jffs2_mark_node_obsolete() will adjust space accounting */
jffs2_mark_node_obsolete(c, fn->raw);
return 1;
}
dbg_fragtree2("the node is \"%s\" now\n", ref_flag == REF_NORMAL ? "REF_NORMAL" : "REF_PRISTINE");
/* Space accounting was adjusted at check_node_data() */
spin_lock(&c->erase_completion_lock);
fn->raw->flash_offset = ref_offset(fn->raw) | ref_flag;
spin_unlock(&c->erase_completion_lock);
return 0;
}
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;
ret = c->inocache_list[ino % INOCACHE_HASHSIZE];
while (ret && ret->ino < ino) {
ret = ret->next;
}
if (ret && ret->ino != ino)
ret = NULL;
return ret;
}
void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new)
{
struct jffs2_inode_cache **prev;
spin_lock(&c->inocache_lock);
if (!new->ino)
new->ino = ++c->highest_ino;
dbg_inocache("add %p (ino #%u)\n", new, new->ino);
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;
#ifdef CONFIG_JFFS2_FS_XATTR
BUG_ON(old->xref);
#endif
dbg_inocache("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;
}
/* Free it now unless it's in READING or CLEARING state, which
are the transitions upon read_inode() and clear_inode(). The
rest of the time we know nobody else is looking at it, and
if it's held by read_inode() or clear_inode() they'll free it
for themselves. */
if (old->state != INO_STATE_READING && old->state != INO_STATE_CLEARING)
jffs2_free_inode_cache(old);
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;
jffs2_xattr_free_inode(c, 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) {
if (this[REFS_PER_BLOCK].flash_offset == REF_LINK_NODE)
next = this[REFS_PER_BLOCK].next_in_ino;
else
next = NULL;
jffs2_free_refblock(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;
dbg_fragtree2("root %p, offset %d\n", fragtree, offset);
next = fragtree->rb_node;
while(next) {
frag = rb_entry(next, struct jffs2_node_frag, rb);
if (frag->ofs + frag->size <= offset) {
/* 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) {
next = frag->rb.rb_left;
} else {
return frag;
}
}
/* Exact match not found. Go back up looking at each parent,
and return the closest smaller one */
if (prev)
dbg_fragtree2("no match. Returning frag %#04x-%#04x, closest previous\n",
prev->ofs, prev->ofs+prev->size);
else
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;
dbg_fragtree("killing\n");
frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb));
while(frag) {
if (frag->rb.rb_left) {
frag = frag_left(frag);
continue;
}
if (frag->rb.rb_right) {
frag = frag_right(frag);
continue;
}
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();
}
}
struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb,
uint32_t ofs, uint32_t len,
struct jffs2_inode_cache *ic)
{
struct jffs2_raw_node_ref *ref;
BUG_ON(!jeb->allocated_refs);
jeb->allocated_refs--;
ref = jeb->last_node;
dbg_noderef("Last node at %p is (%08x,%p)\n", ref, ref->flash_offset,
ref->next_in_ino);
while (ref->flash_offset != REF_EMPTY_NODE) {
if (ref->flash_offset == REF_LINK_NODE)
ref = ref->next_in_ino;
else
ref++;
}
dbg_noderef("New ref is %p (%08x becomes %08x,%p) len 0x%x\n", ref,
ref->flash_offset, ofs, ref->next_in_ino, len);
ref->flash_offset = ofs;
if (!jeb->first_node) {
jeb->first_node = ref;
BUG_ON(ref_offset(ref) != jeb->offset);
} else if (unlikely(ref_offset(ref) != jeb->offset + c->sector_size - jeb->free_size)) {
uint32_t last_len = ref_totlen(c, jeb, jeb->last_node);
JFFS2_ERROR("Adding new ref %p at (0x%08x-0x%08x) not immediately after previous (0x%08x-0x%08x)\n",
ref, ref_offset(ref), ref_offset(ref)+len,
ref_offset(jeb->last_node),
ref_offset(jeb->last_node)+last_len);
BUG();
}
jeb->last_node = ref;
if (ic) {
ref->next_in_ino = ic->nodes;
ic->nodes = ref;
} else {
ref->next_in_ino = NULL;
}
switch(ref_flags(ref)) {
case REF_UNCHECKED:
c->unchecked_size += len;
jeb->unchecked_size += len;
break;
case REF_NORMAL:
case REF_PRISTINE:
c->used_size += len;
jeb->used_size += len;
break;
case REF_OBSOLETE:
c->dirty_size += len;
jeb->dirty_size += len;
break;
}
c->free_size -= len;
jeb->free_size -= len;
#ifdef TEST_TOTLEN
/* Set (and test) __totlen field... for now */
ref->__totlen = len;
ref_totlen(c, jeb, ref);
#endif
return ref;
}
/* No locking, no reservation of 'ref'. Do not use on a live file system */
int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
uint32_t size)
{
if (!size)
return 0;
if (unlikely(size > jeb->free_size)) {
printk(KERN_CRIT "Dirty space 0x%x larger then free_size 0x%x (wasted 0x%x)\n",
size, jeb->free_size, jeb->wasted_size);
BUG();
}
/* REF_EMPTY_NODE is !obsolete, so that works OK */
if (jeb->last_node && ref_obsolete(jeb->last_node)) {
#ifdef TEST_TOTLEN
jeb->last_node->__totlen += size;
#endif
c->dirty_size += size;
c->free_size -= size;
jeb->dirty_size += size;
jeb->free_size -= size;
} else {
uint32_t ofs = jeb->offset + c->sector_size - jeb->free_size;
ofs |= REF_OBSOLETE;
jffs2_link_node_ref(c, jeb, ofs, size, NULL);
}
return 0;
}
/* Calculate totlen from surrounding nodes or eraseblock */
static inline uint32_t __ref_totlen(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb,
struct jffs2_raw_node_ref *ref)
{
uint32_t ref_end;
struct jffs2_raw_node_ref *next_ref = ref_next(ref);
if (next_ref)
ref_end = ref_offset(next_ref);
else {
if (!jeb)
jeb = &c->blocks[ref->flash_offset / c->sector_size];
/* Last node in block. Use free_space */
if (unlikely(ref != jeb->last_node)) {
printk(KERN_CRIT "ref %p @0x%08x is not jeb->last_node (%p @0x%08x)\n",
ref, ref_offset(ref), jeb->last_node, jeb->last_node?ref_offset(jeb->last_node):0);
BUG();
}
ref_end = jeb->offset + c->sector_size - jeb->free_size;
}
return ref_end - ref_offset(ref);
}
uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_node_ref *ref)
{
uint32_t ret;
ret = __ref_totlen(c, jeb, ref);
#ifdef TEST_TOTLEN
if (unlikely(ret != ref->__totlen)) {
if (!jeb)
jeb = &c->blocks[ref->flash_offset / c->sector_size];
printk(KERN_CRIT "Totlen for ref at %p (0x%08x-0x%08x) miscalculated as 0x%x instead of %x\n",
ref, ref_offset(ref), ref_offset(ref)+ref->__totlen,
ret, ref->__totlen);
if (ref_next(ref)) {
printk(KERN_CRIT "next %p (0x%08x-0x%08x)\n", ref_next(ref), ref_offset(ref_next(ref)),
ref_offset(ref_next(ref))+ref->__totlen);
} else
printk(KERN_CRIT "No next ref. jeb->last_node is %p\n", jeb->last_node);
printk(KERN_CRIT "jeb->wasted_size %x, dirty_size %x, used_size %x, free_size %x\n", jeb->wasted_size, jeb->dirty_size, jeb->used_size, jeb->free_size);
#if defined(JFFS2_DBG_DUMPS) || defined(JFFS2_DBG_PARANOIA_CHECKS)
__jffs2_dbg_dump_node_refs_nolock(c, jeb);
#endif
WARN_ON(1);
ret = ref->__totlen;
}
#endif /* TEST_TOTLEN */
return ret;
}
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