mirror of
https://github.com/reactos/reactos.git
synced 2024-11-20 14:30:57 +00:00
416 lines
9.1 KiB
C
416 lines
9.1 KiB
C
/*
|
|
* PROJECT: Mke2fs
|
|
* FILE: Memory.c
|
|
* PROGRAMMER: Matt Wu <mattwu@163.com>
|
|
* HOMEPAGE: http://ext2.yeah.net
|
|
*/
|
|
|
|
/* INCLUDES **************************************************************/
|
|
|
|
#include "Mke2fs.h"
|
|
#include <debug.h>
|
|
|
|
/* DEFINITIONS ***********************************************************/
|
|
|
|
extern char *device_name;
|
|
|
|
/* FUNCTIONS *************************************************************/
|
|
|
|
|
|
/*
|
|
* Return the group # of an inode number
|
|
*/
|
|
int ext2_group_of_ino(PEXT2_FILESYS fs, ULONG ino)
|
|
{
|
|
return (ino - 1) / fs->ext2_sb->s_inodes_per_group;
|
|
}
|
|
|
|
/*
|
|
* Return the group # of a block
|
|
*/
|
|
int ext2_group_of_blk(PEXT2_FILESYS fs, ULONG blk)
|
|
{
|
|
return (blk - fs->ext2_sb->s_first_data_block) /
|
|
fs->ext2_sb->s_blocks_per_group;
|
|
}
|
|
|
|
void ext2_inode_alloc_stats2(PEXT2_FILESYS fs, ULONG ino,
|
|
int inuse, int isdir)
|
|
{
|
|
int group = ext2_group_of_ino(fs, ino);
|
|
|
|
if (inuse > 0)
|
|
ext2_mark_inode_bitmap(fs->inode_map, ino);
|
|
else
|
|
ext2_unmark_inode_bitmap(fs->inode_map, ino);
|
|
|
|
fs->group_desc[group].bg_free_inodes_count -= inuse;
|
|
|
|
if (isdir)
|
|
fs->group_desc[group].bg_used_dirs_count += inuse;
|
|
|
|
fs->ext2_sb->s_free_inodes_count -= inuse;
|
|
}
|
|
|
|
|
|
void ext2_inode_alloc_stats(PEXT2_FILESYS fs, ULONG ino, int inuse)
|
|
{
|
|
ext2_inode_alloc_stats2(fs, ino, inuse, 0);
|
|
}
|
|
|
|
void ext2_block_alloc_stats(PEXT2_FILESYS fs, ULONG blk, int inuse)
|
|
{
|
|
int group = ext2_group_of_blk(fs, blk);
|
|
|
|
if (inuse > 0)
|
|
ext2_mark_block_bitmap(fs->block_map, blk);
|
|
else
|
|
ext2_unmark_block_bitmap(fs->block_map, blk);
|
|
|
|
fs->group_desc[group].bg_free_blocks_count -= inuse;
|
|
fs->ext2_sb->s_free_blocks_count -= inuse;
|
|
}
|
|
|
|
|
|
bool ext2_allocate_tables(PEXT2_FILESYS Ext2Sys)
|
|
{
|
|
bool retval;
|
|
ULONG i;
|
|
|
|
for (i = 0; i < Ext2Sys->group_desc_count; i++)
|
|
{
|
|
retval = ext2_allocate_group_table(Ext2Sys, i, Ext2Sys->block_map);
|
|
|
|
if (!retval)
|
|
return retval;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool ext2_allocate_group_table(PEXT2_FILESYS fs, ULONG group,
|
|
PEXT2_BLOCK_BITMAP bmap)
|
|
{
|
|
bool retval;
|
|
ULONG group_blk, start_blk, last_blk, new_blk, blk, j;
|
|
|
|
group_blk = fs->ext2_sb->s_first_data_block +
|
|
(group * fs->ext2_sb->s_blocks_per_group);
|
|
|
|
last_blk = group_blk + fs->ext2_sb->s_blocks_per_group;
|
|
if (last_blk >= fs->ext2_sb->s_blocks_count)
|
|
last_blk = fs->ext2_sb->s_blocks_count - 1;
|
|
|
|
start_blk = group_blk + 3 + fs->desc_blocks;
|
|
if (start_blk > last_blk)
|
|
start_blk = group_blk;
|
|
|
|
if (!bmap)
|
|
bmap = fs->block_map;
|
|
|
|
/*
|
|
* Allocate the inode table
|
|
*/
|
|
if (!fs->group_desc[group].bg_inode_table)
|
|
{
|
|
retval = ext2_get_free_blocks(fs, start_blk, last_blk,
|
|
fs->inode_blocks_per_group,
|
|
bmap, &new_blk);
|
|
if (!retval)
|
|
return retval;
|
|
|
|
for (j=0, blk = new_blk;
|
|
j < fs->inode_blocks_per_group;
|
|
j++, blk++)
|
|
ext2_mark_block_bitmap(bmap, blk);
|
|
|
|
fs->group_desc[group].bg_inode_table = new_blk;
|
|
}
|
|
|
|
/*
|
|
* Allocate the block and inode bitmaps, if necessary
|
|
*/
|
|
if (fs->stride)
|
|
{
|
|
start_blk += fs->inode_blocks_per_group;
|
|
start_blk += ((fs->stride * group) %
|
|
(last_blk - start_blk));
|
|
if (start_blk > last_blk)
|
|
/* should never happen */
|
|
start_blk = group_blk;
|
|
}
|
|
else
|
|
{
|
|
start_blk = group_blk;
|
|
}
|
|
|
|
if (!fs->group_desc[group].bg_block_bitmap)
|
|
{
|
|
retval = ext2_get_free_blocks(fs, start_blk, last_blk,
|
|
1, bmap, &new_blk);
|
|
|
|
if (!retval)
|
|
retval = ext2_get_free_blocks(fs, group_blk,
|
|
last_blk, 1, bmap, &new_blk);
|
|
|
|
if (!retval)
|
|
return retval;
|
|
|
|
ext2_mark_block_bitmap(bmap, new_blk);
|
|
fs->group_desc[group].bg_block_bitmap = new_blk;
|
|
}
|
|
|
|
if (!fs->group_desc[group].bg_inode_bitmap)
|
|
{
|
|
retval = ext2_get_free_blocks(fs, start_blk, last_blk,
|
|
1, bmap, &new_blk);
|
|
if (!retval)
|
|
retval = ext2_get_free_blocks(fs, group_blk,
|
|
last_blk, 1, bmap, &new_blk);
|
|
if (!retval)
|
|
return retval;
|
|
|
|
ext2_mark_block_bitmap(bmap, new_blk);
|
|
fs->group_desc[group].bg_inode_bitmap = new_blk;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool ext2_get_free_blocks(PEXT2_FILESYS fs, ULONG start, ULONG finish,
|
|
int num, PEXT2_BLOCK_BITMAP map, ULONG *ret)
|
|
{
|
|
ULONG b = start;
|
|
|
|
if (!map)
|
|
map = fs->block_map;
|
|
|
|
if (!map)
|
|
return false;
|
|
|
|
if (!b)
|
|
b = fs->ext2_sb->s_first_data_block;
|
|
|
|
if (!finish)
|
|
finish = start;
|
|
|
|
if (!num)
|
|
num = 1;
|
|
|
|
do
|
|
{
|
|
if (b+num-1 > fs->ext2_sb->s_blocks_count)
|
|
b = fs->ext2_sb->s_first_data_block;
|
|
|
|
if (ext2_test_block_bitmap_range(map, b, num))
|
|
{
|
|
*ret = b;
|
|
return true;
|
|
}
|
|
|
|
b++;
|
|
|
|
} while (b != finish);
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
bool write_inode_tables(PEXT2_FILESYS fs)
|
|
{
|
|
bool retval;
|
|
ULONG blk, num;
|
|
int i;
|
|
|
|
for (i = 0; (ULONG)i < fs->group_desc_count; i++)
|
|
{
|
|
blk = fs->group_desc[i].bg_inode_table;
|
|
num = fs->inode_blocks_per_group;
|
|
|
|
retval = zero_blocks(fs, blk, num, &blk, &num);
|
|
if (!retval)
|
|
{
|
|
DPRINT1("\nMke2fs: Could not write %lu blocks "
|
|
"in inode table starting at %lu.\n",
|
|
num, blk);
|
|
|
|
zero_blocks(0, 0, 0, 0, 0);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
zero_blocks(0, 0, 0, 0, 0);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/*
|
|
* Stupid algorithm --- we now just search forward starting from the
|
|
* goal. Should put in a smarter one someday....
|
|
*/
|
|
bool ext2_new_block(PEXT2_FILESYS fs, ULONG goal,
|
|
PEXT2_BLOCK_BITMAP map, ULONG *ret)
|
|
{
|
|
ULONG i;
|
|
|
|
if (!map)
|
|
map = fs->block_map;
|
|
|
|
if (!map)
|
|
return false;
|
|
|
|
if (!goal || (goal >= fs->ext2_sb->s_blocks_count))
|
|
goal = fs->ext2_sb->s_first_data_block;
|
|
|
|
i = goal;
|
|
|
|
do
|
|
{
|
|
if (!ext2_test_block_bitmap(map, i))
|
|
{
|
|
*ret = i;
|
|
return true;
|
|
}
|
|
|
|
i++;
|
|
|
|
if (i >= fs->ext2_sb->s_blocks_count)
|
|
i = fs->ext2_sb->s_first_data_block;
|
|
|
|
} while (i != goal);
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/*
|
|
* This function zeros out the allocated block, and updates all of the
|
|
* appropriate filesystem records.
|
|
*/
|
|
bool ext2_alloc_block(PEXT2_FILESYS fs, ULONG goal, ULONG *ret)
|
|
{
|
|
bool retval;
|
|
ULONG block;
|
|
char *buf = NULL;
|
|
|
|
buf = (char *)RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, fs->blocksize);
|
|
if (!buf)
|
|
return false;
|
|
|
|
if (!fs->block_map)
|
|
{
|
|
retval = ext2_read_block_bitmap(fs);
|
|
if (!retval)
|
|
goto fail;
|
|
}
|
|
|
|
retval = ext2_new_block(fs, goal, 0, &block);
|
|
|
|
if (!retval)
|
|
goto fail;
|
|
|
|
retval = NT_SUCCESS(Ext2WriteDisk(
|
|
fs,
|
|
((LONGLONG)block * fs->blocksize),
|
|
fs->blocksize, (unsigned char *)buf));
|
|
|
|
if (!retval)
|
|
{
|
|
goto fail;
|
|
}
|
|
|
|
ext2_block_alloc_stats(fs, block, +1);
|
|
*ret = block;
|
|
|
|
if (buf)
|
|
{
|
|
RtlFreeHeap(RtlGetProcessHeap(), 0, buf);
|
|
}
|
|
|
|
return true;
|
|
|
|
fail:
|
|
|
|
if (buf)
|
|
{
|
|
RtlFreeHeap(RtlGetProcessHeap(), 0, buf);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/*
|
|
* Create new directory block
|
|
*/
|
|
bool ext2_new_dir_block(PEXT2_FILESYS fs, ULONG dir_ino,
|
|
ULONG parent_ino, char **block)
|
|
{
|
|
PEXT2_DIR_ENTRY dir = NULL;
|
|
char *buf;
|
|
int rec_len;
|
|
int filetype = 0;
|
|
|
|
buf = (char *)RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, fs->blocksize);
|
|
if (!buf)
|
|
return false;
|
|
|
|
dir = (PEXT2_DIR_ENTRY) buf;
|
|
dir->rec_len = fs->blocksize;
|
|
|
|
if (dir_ino)
|
|
{
|
|
if (fs->ext2_sb->s_feature_incompat &
|
|
EXT2_FEATURE_INCOMPAT_FILETYPE)
|
|
filetype = EXT2_FT_DIR << 8;
|
|
/*
|
|
* Set up entry for '.'
|
|
*/
|
|
dir->inode = dir_ino;
|
|
dir->name_len = 1 | filetype;
|
|
dir->name[0] = '.';
|
|
rec_len = dir->rec_len - EXT2_DIR_REC_LEN(1);
|
|
dir->rec_len = EXT2_DIR_REC_LEN(1);
|
|
|
|
/*
|
|
* Set up entry for '..'
|
|
*/
|
|
dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
|
|
dir->rec_len = rec_len;
|
|
dir->inode = parent_ino;
|
|
dir->name_len = 2 | filetype;
|
|
dir->name[0] = '.';
|
|
dir->name[1] = '.';
|
|
}
|
|
|
|
*block = buf;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ext2_write_block(PEXT2_FILESYS fs, ULONG block, void *inbuf)
|
|
{
|
|
bool retval = false;
|
|
|
|
retval = NT_SUCCESS(Ext2WriteDisk(
|
|
fs,
|
|
((ULONGLONG)block * fs->blocksize),
|
|
fs->blocksize, (unsigned char *)inbuf));
|
|
|
|
return retval;
|
|
}
|
|
|
|
bool ext2_read_block(PEXT2_FILESYS fs, ULONG block, void *inbuf)
|
|
{
|
|
bool retval = false;
|
|
|
|
retval = NT_SUCCESS(Ext2ReadDisk(
|
|
fs,
|
|
((ULONGLONG)block * fs->blocksize),
|
|
fs->blocksize, (unsigned char *)inbuf));
|
|
|
|
return retval;
|
|
}
|