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/***************************************************************************
* Copyright (C) 2010 by Roberto Maar *
* robi@users.berlios.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
* *
* C Implementation: imap_search *
***************************************************************************/
//header util.h
#include "util.h"
#include "inode.h"
#include <sys/stat.h>
#include <errno.h>
extern ext2_filsys current_fs;
// search inode by use imap (step1: flag 1 = only directory ; step2: flag 0 = only file)
static void search_imap_inode(char* des_dir, __u32 t_after, __u32 t_before, int flag)
{
struct ext2_group_desc *gdp;
struct ext2_inode_large *inode;
struct dir_list_head_t *dir = NULL;
struct ring_buf* i_list = NULL;
r_item* item = NULL;
int zero_flag, retval, load, x ,i ;
char *pathname = NULL;
char *buf= NULL;
__u32 blocksize, inodesize, inode_max, inode_per_group, block_count;
__u16 inode_per_block , inode_block_group, group;
blk_t block_nr;
__u32 c_time, d_time, mode;
ext2_ino_t first_block_inode_nr , inode_nr;
pathname = malloc(26);
blocksize = current_fs->blocksize;
inodesize = current_fs->super->s_inode_size;
inode_max = current_fs->super->s_inodes_count;
inode_per_group = current_fs->super->s_inodes_per_group;
buf = malloc(blocksize);
inode_per_block = blocksize / inodesize;
inode_block_group = inode_per_group / inode_per_block;
for (group = 0 ; group < current_fs->group_desc_count ; group++){
gdp = ¤t_fs->group_desc[group];
zero_flag = 0;
if (!(flag & 0x02)){ //skip this in disaster mode
// NEXT GROUP IF INODE NOT INIT
if (gdp->bg_flags & (EXT2_BG_INODE_UNINIT)) continue;
// SET ZERO-FLAG IF FREE INODES == INODE/GROUP for fast ext3
if (gdp->bg_free_inodes_count == inode_per_group) zero_flag = 1;
}
//FIXME for struct ext4_group_desc 48/64BIT
for (block_nr = gdp->bg_inode_table , block_count = 0 ;
block_nr < (gdp->bg_inode_table + inode_block_group); block_nr++, block_count++) {
if (!(flag & 0x02)){ //skip this in disaster mode
// break if the first block only zero inode
if ((block_count ==1) && (zero_flag == (inode_per_block + 1))) break;
}
//FIXME inode_max ????
first_block_inode_nr = (group * inode_per_group) + (block_count * inode_per_block) + 1;
load = 0;
for (i = 0; i<inode_per_block;i++){
if ( ! ext2fs_test_block_bitmap(imap,first_block_inode_nr + i)){
load++;
break;
}
}
if (load){
retval = read_block ( current_fs , &block_nr , buf);
if (retval) return;
for (inode_nr = first_block_inode_nr ,x = 0; x < inode_per_block ; inode_nr++ , x++){
if ( ! ext2fs_test_block_bitmap(imap,inode_nr)){
inode = (struct ext2_inode_large*) (buf + (x*inodesize));
c_time = ext2fs_le32_to_cpu(inode->i_ctime);
mode = ext2fs_le32_to_cpu(inode->i_mode);
if ( ! ( flag & 0x02)) {
//no check this inode in disaster mode
if ((! c_time ) && (!(inode->i_mode & LINUX_S_IFMT)) ) {
if(zero_flag) zero_flag++ ;
continue;
}
d_time = ext2fs_le32_to_cpu(inode->i_dtime);
if ( (! d_time) || d_time <= t_after){
ext2fs_mark_generic_bitmap(imap,inode_nr);
continue;
}
}
// 1. magical step
if (LINUX_S_ISDIR(mode) && ( flag & 0x01) ){
sprintf(pathname,"<%lu>",inode_nr);
struct dir_list_head_t * dir = NULL;
if (flag & 0x02){
//disaster mode
//only search for undeleted entry
dir = get_dir3(NULL,0, inode_nr , "MAGIC-1",pathname, t_after,t_before, 0);
if (dir) {
lookup_local(des_dir, dir,t_after,t_before, RECOV_ALL | LOST_DIR_SEARCH );
clear_dir_list(dir);
}
}
else{ //search for all
dir = get_dir3(NULL,0, inode_nr , "MAGIC-1",pathname, t_after,t_before, DELETED_OPT);
if (dir) {
lookup_local(des_dir, dir,t_after,t_before, DELETED_OPT | RECOV_ALL | LOST_DIR_SEARCH );
clear_dir_list(dir);
}
}
}
// 2. magical step
if (! (flag & 0x01) ){
i_list = get_j_inode_list(current_fs->super, inode_nr);
item = get_undel_inode(i_list,t_after,t_before);
ext2fs_mark_generic_bitmap(imap,inode_nr);
if (item) {
if (! LINUX_S_ISDIR(item->inode->i_mode) ) {
sprintf(pathname,"<%lu>",inode_nr);
recover_file(des_dir,"MAGIC-2", pathname, (struct ext2_inode*)item->inode, inode_nr, 0);
}
}
if (i_list) ring_del(i_list);
}
}
}
}
}
}
if (pathname)
free(pathname);
if(buf) {
free(buf);
buf = NULL;
}
return;
}
//check if the directory always recovert. if, then move to right place
//return 0 if directory is moved
//this function is called from lookup_local() during 1. magical step
int check_find_dir(char *des_dir,ext2_ino_t inode_nr,char *pathname,char *filename){
char *recovername = NULL;
char *dirname = NULL;
struct stat filestat;
int retval = 0;
recovername = malloc(strlen(des_dir) + strlen(pathname) + 30);
dirname = malloc(strlen(des_dir) + strlen(pathname) + strlen(filename) +10);
if (recovername && dirname){
sprintf(recovername,"%s/MAGIC-1/<%lu>",des_dir,inode_nr);
sprintf(dirname,"%s/%s/%s",des_dir,pathname,filename);
retval = stat (recovername, &filestat);
if ((!retval) && (S_ISDIR(filestat.st_mode))){
retval = stat (dirname, &filestat);
if (! retval){
printf("Warning :can't move %s to %s ;file exist; will recover it again\n",recovername,dirname);
retval = 1;
}
else{
if(check_dir(dirname)){
fprintf(stderr,"Unknown error at target directory by file: %s\ntrying to continue normal\n", dirname);
}else{
retval = rename(recovername, dirname);
rename_hardlink_path(recovername, dirname);
}
#ifdef DEBUG
printf("move return: %d : ernno %d : %s -> %s\n",retval, errno, recovername, dirname);
#endif
}
}
free(recovername);
free(dirname);
return retval;
}
}
//2 step search for journalinode, will find some lost directory and files
void imap_search(char* des_dir, __u32 t_after, __u32 t_before , int disaster ){
printf("MAGIC-1 : start lost directory search\n");
search_imap_inode(des_dir, t_after, t_before, 1 | disaster ); //search for lost fragments of directorys
printf("MAGIC-2 : start lost file search\n");
search_imap_inode(des_dir, t_after, t_before, 0 | disaster ); //search for lost files
return;
}
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