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