busybox/e2fsprogs/ext2fs/ext2fs_inline.c
2005-09-25 05:18:04 +00:00

473 lines
9.5 KiB
C

/*
* ext2fs.h --- ext2fs
*
* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include "ext2fs/ext2fs.h"
#include "ext2fs/bitops.h"
/*
* Allocate memory
*/
errcode_t ext2fs_get_mem(unsigned long size, void *ptr)
{
void **pp = (void **)ptr;
*pp = malloc(size);
if (!*pp)
return EXT2_ET_NO_MEMORY;
return 0;
}
/*
* Free memory
*/
errcode_t ext2fs_free_mem(void *ptr)
{
void **pp = (void **)ptr;
free(*pp);
*pp = 0;
return 0;
}
/*
* Resize memory
*/
errcode_t ext2fs_resize_mem(unsigned long EXT2FS_ATTR((unused)) old_size,
unsigned long size, void *ptr)
{
void *p;
void **pp = (void **)ptr;
p = realloc(*pp, size);
if (!p)
return EXT2_ET_NO_MEMORY;
*pp = p;
return 0;
}
/*
* Mark a filesystem superblock as dirty
*/
void ext2fs_mark_super_dirty(ext2_filsys fs)
{
fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_CHANGED;
}
/*
* Mark a filesystem as changed
*/
void ext2fs_mark_changed(ext2_filsys fs)
{
fs->flags |= EXT2_FLAG_CHANGED;
}
/*
* Check to see if a filesystem has changed
*/
int ext2fs_test_changed(ext2_filsys fs)
{
return (fs->flags & EXT2_FLAG_CHANGED);
}
/*
* Mark a filesystem as valid
*/
void ext2fs_mark_valid(ext2_filsys fs)
{
fs->flags |= EXT2_FLAG_VALID;
}
/*
* Mark a filesystem as NOT valid
*/
void ext2fs_unmark_valid(ext2_filsys fs)
{
fs->flags &= ~EXT2_FLAG_VALID;
}
/*
* Check to see if a filesystem is valid
*/
int ext2fs_test_valid(ext2_filsys fs)
{
return (fs->flags & EXT2_FLAG_VALID);
}
/*
* Mark the inode bitmap as dirty
*/
void ext2fs_mark_ib_dirty(ext2_filsys fs)
{
fs->flags |= EXT2_FLAG_IB_DIRTY | EXT2_FLAG_CHANGED;
}
/*
* Mark the block bitmap as dirty
*/
void ext2fs_mark_bb_dirty(ext2_filsys fs)
{
fs->flags |= EXT2_FLAG_BB_DIRTY | EXT2_FLAG_CHANGED;
}
/*
* Check to see if a filesystem's inode bitmap is dirty
*/
int ext2fs_test_ib_dirty(ext2_filsys fs)
{
return (fs->flags & EXT2_FLAG_IB_DIRTY);
}
/*
* Check to see if a filesystem's block bitmap is dirty
*/
int ext2fs_test_bb_dirty(ext2_filsys fs)
{
return (fs->flags & EXT2_FLAG_BB_DIRTY);
}
/*
* Return the group # of a block
*/
int ext2fs_group_of_blk(ext2_filsys fs, blk_t blk)
{
return (blk - fs->super->s_first_data_block) /
fs->super->s_blocks_per_group;
}
/*
* Return the group # of an inode number
*/
int ext2fs_group_of_ino(ext2_filsys fs, ext2_ino_t ino)
{
return (ino - 1) / fs->super->s_inodes_per_group;
}
blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
struct ext2_inode *inode)
{
return inode->i_blocks -
(inode->i_file_acl ? fs->blocksize >> 9 : 0);
}
__u16 ext2fs_swab16(__u16 val)
{
return (val >> 8) | (val << 8);
}
__u32 ext2fs_swab32(__u32 val)
{
return ((val>>24) | ((val>>8)&0xFF00) |
((val<<8)&0xFF0000) | (val<<24));
}
int ext2fs_find_first_bit_set(void * addr, unsigned size)
{
char *cp = (unsigned char *) addr;
int res = 0, d0;
if (!size)
return 0;
while ((size > res) && (*cp == 0)) {
cp++;
res += 8;
}
d0 = ffs(*cp);
if (d0 == 0)
return size;
return res + d0 - 1;
}
int ext2fs_find_next_bit_set (void * addr, int size, int offset)
{
unsigned char * p;
int set = 0, bit = offset & 7, res = 0, d0;
res = offset >> 3;
p = ((unsigned char *) addr) + res;
if (bit) {
set = ffs(*p & ~((1 << bit) - 1));
if (set)
return (offset & ~7) + set - 1;
p++;
res += 8;
}
while ((size > res) && (*p == 0)) {
p++;
res += 8;
}
d0 = ffs(*p);
if (d0 == 0)
return size;
return (res + d0 - 1);
}
int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
blk_t bitno);
int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
blk_t bitno)
{
if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);
return 0;
}
return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap);
}
int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
blk_t block)
{
return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap)
bitmap,
block);
}
int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
blk_t block)
{
return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
block);
}
int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
blk_t block)
{
return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
block);
}
int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
ext2_ino_t inode)
{
return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
inode);
}
int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
ext2_ino_t inode)
{
return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
inode);
}
int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
ext2_ino_t inode)
{
return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
inode);
}
void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
blk_t block)
{
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((block < bitmap->start) || (block > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
bitmap->description);
return;
}
#endif
ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
}
void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
blk_t block)
{
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((block < bitmap->start) || (block > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK,
block, bitmap->description);
return;
}
#endif
ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
}
int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
blk_t block)
{
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((block < bitmap->start) || (block > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
block, bitmap->description);
return 0;
}
#endif
return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
}
void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
ext2_ino_t inode)
{
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((inode < bitmap->start) || (inode > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_MARK,
inode, bitmap->description);
return;
}
#endif
ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
}
void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
ext2_ino_t inode)
{
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((inode < bitmap->start) || (inode > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_UNMARK,
inode, bitmap->description);
return;
}
#endif
ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
}
int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
ext2_ino_t inode)
{
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((inode < bitmap->start) || (inode > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_TEST,
inode, bitmap->description);
return 0;
}
#endif
return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
}
blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
{
return bitmap->start;
}
ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
{
return bitmap->start;
}
blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
{
return bitmap->end;
}
ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
{
return bitmap->end;
}
int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
blk_t block, int num)
{
int i;
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
block, bitmap->description);
return 0;
}
for (i=0; i < num; i++) {
if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
return 0;
}
return 1;
}
int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
blk_t block, int num)
{
int i;
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
block, bitmap->description);
return 0;
}
#endif
for (i=0; i < num; i++) {
if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
return 0;
}
return 1;
}
void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
blk_t block, int num)
{
int i;
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
bitmap->description);
return;
}
for (i=0; i < num; i++)
ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
}
void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
blk_t block, int num)
{
int i;
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
bitmap->description);
return;
}
#endif
for (i=0; i < num; i++)
ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
}
void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
blk_t block, int num)
{
int i;
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
bitmap->description);
return;
}
for (i=0; i < num; i++)
ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
}
void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
blk_t block, int num)
{
int i;
#ifdef EXT2FS_DEBUG_FAST_OPS
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
bitmap->description);
return;
}
#endif
for (i=0; i < num; i++)
ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
}