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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
/*
* This file implements commit-related functionality of the LEB properties
* subsystem.
*/
#include "crc16.h"
#include "ubifs.h"
/**
* free_obsolete_cnodes - free obsolete cnodes for commit end.
* @c: UBIFS file-system description object
*/
static void free_obsolete_cnodes(struct ubifs_info *c)
{
struct ubifs_cnode *cnode, *cnext;
cnext = c->lpt_cnext;
if (!cnext)
return;
do {
cnode = cnext;
cnext = cnode->cnext;
if (test_bit(OBSOLETE_CNODE, &cnode->flags))
kfree(cnode);
else
cnode->cnext = NULL;
} while (cnext != c->lpt_cnext);
c->lpt_cnext = NULL;
}
/**
* first_nnode - find the first nnode in memory.
* @c: UBIFS file-system description object
* @hght: height of tree where nnode found is returned here
*
* This function returns a pointer to the nnode found or %NULL if no nnode is
* found. This function is a helper to 'ubifs_lpt_free()'.
*/
static struct ubifs_nnode *first_nnode(struct ubifs_info *c, int *hght)
{
struct ubifs_nnode *nnode;
int h, i, found;
nnode = c->nroot;
*hght = 0;
if (!nnode)
return NULL;
for (h = 1; h < c->lpt_hght; h++) {
found = 0;
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
if (nnode->nbranch[i].nnode) {
found = 1;
nnode = nnode->nbranch[i].nnode;
*hght = h;
break;
}
}
if (!found)
break;
}
return nnode;
}
/**
* next_nnode - find the next nnode in memory.
* @c: UBIFS file-system description object
* @nnode: nnode from which to start.
* @hght: height of tree where nnode is, is passed and returned here
*
* This function returns a pointer to the nnode found or %NULL if no nnode is
* found. This function is a helper to 'ubifs_lpt_free()'.
*/
static struct ubifs_nnode *next_nnode(struct ubifs_info *c,
struct ubifs_nnode *nnode, int *hght)
{
struct ubifs_nnode *parent;
int iip, h, i, found;
parent = nnode->parent;
if (!parent)
return NULL;
if (nnode->iip == UBIFS_LPT_FANOUT - 1) {
*hght -= 1;
return parent;
}
for (iip = nnode->iip + 1; iip < UBIFS_LPT_FANOUT; iip++) {
nnode = parent->nbranch[iip].nnode;
if (nnode)
break;
}
if (!nnode) {
*hght -= 1;
return parent;
}
for (h = *hght + 1; h < c->lpt_hght; h++) {
found = 0;
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
if (nnode->nbranch[i].nnode) {
found = 1;
nnode = nnode->nbranch[i].nnode;
*hght = h;
break;
}
}
if (!found)
break;
}
return nnode;
}
/**
* ubifs_lpt_free - free resources owned by the LPT.
* @c: UBIFS file-system description object
* @wr_only: free only resources used for writing
*/
void ubifs_lpt_free(struct ubifs_info *c, int wr_only)
{
struct ubifs_nnode *nnode;
int i, hght;
/* Free write-only things first */
free_obsolete_cnodes(c); /* Leftover from a failed commit */
vfree(c->ltab_cmt);
c->ltab_cmt = NULL;
vfree(c->lpt_buf);
c->lpt_buf = NULL;
kfree(c->lsave);
c->lsave = NULL;
if (wr_only)
return;
/* Now free the rest */
nnode = first_nnode(c, &hght);
while (nnode) {
for (i = 0; i < UBIFS_LPT_FANOUT; i++)
kfree(nnode->nbranch[i].nnode);
nnode = next_nnode(c, nnode, &hght);
}
for (i = 0; i < LPROPS_HEAP_CNT; i++)
kfree(c->lpt_heap[i].arr);
kfree(c->dirty_idx.arr);
kfree(c->nroot);
vfree(c->ltab);
kfree(c->lpt_nod_buf);
}
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