source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/ext2fs_inline.c@ 821

/*
 * 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.h"
#include "bitops.h"
#include <string.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;

    /* Use "memcpy" for pointer assignments here to avoid problems
     * with C99 strict type aliasing rules. */
    memcpy(&p, ptr, sizeof (p));
    p = realloc(p, size);
    if (!p)
        return EXT2_ET_NO_MEMORY;
    memcpy(ptr, &p, sizeof (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_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)
{
    ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
}

void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
                          blk_t block)
{
    ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
}

int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
                        blk_t block)
{
    return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
}

void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
                        ext2_ino_t inode)
{
    ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
}

void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
                          ext2_ino_t inode)
{
    ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
}

int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
                       ext2_ino_t inode)
{
    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;

    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;

    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;
    for (i=0; i < num; i++)
        ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
}