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/***************************************************************************
* Copyright (C) 2011 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. *
***************************************************************************/
// The Magic functions for ext4 need a small stack to the cache found extents
// The extent_db.c functions provide the interface for this.
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "extent_db.h"
extern ext2_filsys current_fs;
static int mark_extent_len(struct extent_db_t*, blk_t, void*);
struct extent_area* new_extent_area(){
struct extent_area *ea;
ea = malloc(sizeof(struct extent_area));
if (ea)
memset(ea, 0, sizeof(struct extent_area));
return (ea) ? ea : NULL;
}
static struct extent_db_item* new_item(struct extent_db_item *last){
struct extent_db_item *this = NULL;
this = malloc(sizeof(struct extent_db_item));
if (this){
this->last = last;
this->entry = NULL;
this->next = NULL;
return this;
}
return NULL;
}
struct extent_db_t* extent_db_init(ext2fs_block_bitmap d_bmap){
struct extent_db_t* db = NULL;
db = malloc(sizeof(struct extent_db_t));
if (db){
db->count = 0;
db->max_depth = 0;
db->d_bmap = d_bmap;
db->next = new_item((struct extent_db_item*)db);
}
return db;
}
int extent_db_add (struct extent_db_t* db, struct extent_area *ea, int flag){
struct extent_db_item *pointer;
pointer = db->next;
while (pointer->entry)
pointer = pointer->next;
//FIXME
if ((pointer->last != (struct extent_db_item*)db) && (pointer->last->entry) && (pointer->last->entry->end_b == ea->start_b -1) && (ea->l_start)){
pointer->last->entry->len += ea->len;
pointer->last->entry->end_b += ea->len;
pointer->last->entry->size += (unsigned long long)ea->len * current_fs->blocksize;
free (ea);
return db->count;
}
pointer->next = new_item(pointer);
if (pointer->next){
pointer->entry = ea;
if (db->max_depth < ea->depth) db->max_depth = ea->depth;
(db->count)++;
if (flag) mark_extent_len(db, ea->blocknr, NULL );
else {
ea->end_b = ea->start_b + ea->len -1;
ea->size = (unsigned long long)ea->len * current_fs->blocksize;
}
return db->count;
}
return 0;
}
__u32 extentd_db_find( struct extent_db_t*db ,__u32 start, struct extent_area *ea) {
struct extent_db_item *pointer;
__u32 end = 0;
__u16 depth;
depth = db->max_depth+1;
while ((depth) && (!end)){
pointer = db->next;
while ((pointer->entry) && ((pointer->entry->depth != depth - 1) || (pointer->entry->l_start != start)))
pointer = pointer->next;
if (pointer->entry){
memcpy(ea,pointer->entry,sizeof(struct extent_area));
end = pointer->entry->l_end;
}
else{
if ((depth - 1) && (!start))
(db->max_depth)--;
depth--;
}
} //depth
return end;
}
int extent_db_del(struct extent_db_t* db,blk_t blk){
struct extent_db_item *pointer;
int ret = 0;
pointer = db->next;
while ((pointer->entry) && (pointer->entry->blocknr < blk))
pointer = pointer->next;
if ((pointer->entry) && (pointer->entry->blocknr == blk)){
(pointer->last)->next = pointer->next;
pointer->next->last = pointer->last;
if(pointer->entry) free(pointer->entry);
if (pointer) free(pointer);
(db->count)--;
// printf("Extend DB : entry %lu deleted\n",blk);
ret = 1;
}
return ret;
}
static void clear_entry(struct extent_db_item *p){
if (p->next)
clear_entry(p->next);
if (p->entry) {
// printf("EXT-DB : %10u %d %10lu %10lu %10lu\n",p->entry->blocknr, (p->entry->l_start)?1:0, p->entry->start_b, p->entry->end_b, p->entry->len);
free(p->entry);
}
if (p) free(p);
return;
}
void extent_db_clear(struct extent_db_t* db){
// printf("Extent DB has %lu Entries ; clean now\n",db->count);
clear_entry(db->next);
if(db) free(db);
return;
}
static int mark_extent_len(struct extent_db_t* db, blk_t blk, void * buf){
void *buf_tmp = NULL;
int bufset = 0;
int ret = 0;
struct ext3_extent_idx *idx;
struct ext3_extent *extent;
struct ext3_extent_header *header;
int entry,i;
if (!buf){
buf = malloc(current_fs->blocksize);
io_channel_read_blk (current_fs->io, blk, 1, buf );
bufset=1;
}
buf_tmp = malloc(current_fs->blocksize);
if ((!buf_tmp) || (!buf))
return 1;
header = buf;
ret = ext2fs_extent_header_verify((void*) header, current_fs->blocksize);
ext2fs_unmark_generic_bitmap(db->d_bmap, blk);
if(!ret){
for (entry =1; ((!ret) && (entry <= ext2fs_le16_to_cpu(header->eh_entries))) ; entry++){
if (ext2fs_le16_to_cpu(header->eh_depth)){
idx = (struct ext3_extent_idx*) (header + entry);
if(io_channel_read_blk ( current_fs->io,ext2fs_le32_to_cpu(idx->ei_leaf), 1, buf_tmp )){
fprintf(stderr,"Error read block %lu\n", (long unsigned int)ext2fs_le32_to_cpu(idx->ei_leaf));
ret = 2;
}
else{
//Recursion
if (! extent_db_del(db,ext2fs_le32_to_cpu(idx->ei_leaf)))
ret = mark_extent_len(db, ext2fs_le32_to_cpu(idx->ei_leaf),buf_tmp);
}
}
else{
extent = (struct ext3_extent*)(header + entry);
for (i = 0; i< ext2fs_le16_to_cpu(extent->ee_len); i++){
ext2fs_unmark_generic_bitmap(db->d_bmap, ext2fs_le32_to_cpu(extent->ee_start) + i );
}
}
}
}
if (buf_tmp) free(buf_tmp);
if (bufset && buf) free(buf);
return ret;
}
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