void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
{
__u32 i, j;
for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)
ext2fs_set_bit(j, map->bitmap);
return;
}
int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
__u32 bitno)
{
if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
ext2fs_warn_bitmap2(bitmap, EXT2FS_MARK_ERROR, bitno);
return 0;
}
return ext2fs_set_bit(bitno - bitmap->start, bitmap->bitmap);
}
void ext2fs_set_generic_bitmap_padding(ext2fs_generic_bitmap map)
{
__u32 i, j;
/* Protect loop from wrap-around if map->real_end is maxed */
for (i=map->end+1, j = i - map->start;
i <= map->real_end && i > map->end;
i++, j++)
ext2fs_set_bit(j, map->bitmap);
}
errcode_t ext2fs_write_block_bitmap (ext2_filsys fs)
{
dgrp_t i;
unsigned int j;
int nbytes;
unsigned int nbits;
errcode_t retval;
char * block_bitmap = fs->block_map->bitmap;
char * bitmap_block = NULL;
blk_t blk;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
if (!block_bitmap)
return 0;
nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
bitmap_block = memalign(getpagesize(), fs->blocksize);
memset(bitmap_block, 0xff, fs->blocksize);
retval = io_channel_reopen(fs->io, O_RDWR | O_DIRECT);
if (retval)
return retval;
for (i = 0; i < fs->group_desc_count; i++) {
memcpy(bitmap_block, block_bitmap, nbytes);
if (i == fs->group_desc_count - 1) {
/* Force bitmap padding for the last group */
nbits = ((fs->super->s_blocks_count
- fs->super->s_first_data_block)
% EXT2_BLOCKS_PER_GROUP(fs->super));
if (nbits)
for (j = nbits; j < fs->blocksize * 8; j++)
ext2fs_set_bit(j, bitmap_block);
}
blk = fs->group_desc[i].bg_block_bitmap;
if (blk) {
#ifdef EXT2_BIG_ENDIAN_BITMAPS
if (!((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
(fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)))
ext2fs_swap_bitmap(fs, bitmap_block, nbytes);
#endif
retval = io_channel_write_blk(fs->io, blk, 1,
bitmap_block);
if (retval)
return EXT2_ET_BLOCK_BITMAP_WRITE;
}
block_bitmap += nbytes;
}
io_channel_reopen(fs->io, O_RDWR);
fs->flags &= ~EXT2_FLAG_BB_DIRTY;
free(bitmap_block);
return 0;
}
int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
__u32 bitno)
{
if (!EXT2FS_IS_32_BITMAP(bitmap)) {
if (EXT2FS_IS_64_BITMAP(bitmap)) {
ext2fs_warn_bitmap32(bitmap, __func__);
return ext2fs_mark_generic_bmap(bitmap, bitno);
}
#ifndef OMIT_COM_ERR
com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
"mark_bitmap(%lu)", (unsigned long) bitno);
#endif
return 0;
}
if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
ext2fs_warn_bitmap2(bitmap, EXT2FS_MARK_ERROR, bitno);
return 0;
}
return ext2fs_set_bit(bitno - bitmap->start, bitmap->bitmap);
}
static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
dgrp_t i;
unsigned int j;
int block_nbytes, inode_nbytes;
unsigned int nbits;
errcode_t retval;
char *block_buf = NULL, *inode_buf = NULL;
int csum_flag = 0;
blk64_t blk;
blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
ext2_ino_t ino_itr = 1;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
csum_flag = 1;
inode_nbytes = block_nbytes = 0;
if (do_block) {
block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
retval = io_channel_alloc_buf(fs->io, 0, &block_buf);
if (retval)
goto errout;
memset(block_buf, 0xff, fs->blocksize);
}
if (do_inode) {
inode_nbytes = (size_t)
((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
retval = io_channel_alloc_buf(fs->io, 0, &inode_buf);
if (retval)
goto errout;
memset(inode_buf, 0xff, fs->blocksize);
}
for (i = 0; i < fs->group_desc_count; i++) {
if (!do_block)
goto skip_block_bitmap;
if (csum_flag && ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)
)
goto skip_this_block_bitmap;
retval = ext2fs_get_block_bitmap_range2(fs->block_map,
blk_itr, block_nbytes << 3, block_buf);
if (retval)
goto errout;
if (i == fs->group_desc_count - 1) {
/* Force bitmap padding for the last group */
nbits = EXT2FS_NUM_B2C(fs,
((ext2fs_blocks_count(fs->super)
- (__u64) fs->super->s_first_data_block)
% (__u64) EXT2_BLOCKS_PER_GROUP(fs->super)));
if (nbits)
for (j = nbits; j < fs->blocksize * 8; j++)
ext2fs_set_bit(j, block_buf);
}
blk = ext2fs_block_bitmap_loc(fs, i);
if (blk) {
retval = io_channel_write_blk64(fs->io, blk, 1,
block_buf);
if (retval) {
retval = EXT2_ET_BLOCK_BITMAP_WRITE;
goto errout;
}
}
skip_this_block_bitmap:
blk_itr += block_nbytes << 3;
skip_block_bitmap:
if (!do_inode)
continue;
if (csum_flag && ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT)
)
goto skip_this_inode_bitmap;
retval = ext2fs_get_inode_bitmap_range2(fs->inode_map,
ino_itr, inode_nbytes << 3, inode_buf);
if (retval)
goto errout;
blk = ext2fs_inode_bitmap_loc(fs, i);
if (blk) {
retval = io_channel_write_blk64(fs->io, blk, 1,
inode_buf);
if (retval) {
retval = EXT2_ET_INODE_BITMAP_WRITE;
goto errout;
}
}
skip_this_inode_bitmap:
ino_itr += inode_nbytes << 3;
}
if (do_block) {
fs->flags &= ~EXT2_FLAG_BB_DIRTY;
ext2fs_free_mem(&block_buf);
}
if (do_inode) {
fs->flags &= ~EXT2_FLAG_IB_DIRTY;
ext2fs_free_mem(&inode_buf);
}
return 0;
errout:
if (inode_buf)
ext2fs_free_mem(&inode_buf);
if (block_buf)
ext2fs_free_mem(&block_buf);
return retval;
}
main(int argc, char **argv)
{
int i, j, size;
unsigned char testarray[12];
unsigned char *bigarray;
size = sizeof(bitarray)*8;
#if 0
i = ext2fs_find_first_bit_set(bitarray, size);
while (i < size) {
printf("Bit set: %d\n", i);
i = ext2fs_find_next_bit_set(bitarray, size, i+1);
}
#endif
/* Test test_bit */
for (i=0,j=0; i < size; i++) {
if (ext2fs_test_bit(i, bitarray)) {
if (bits_list[j] == i) {
j++;
} else {
printf("Bit %d set, not expected\n", i);
exit(1);
}
} else {
if (bits_list[j] == i) {
printf("Expected bit %d to be clear.\n", i);
exit(1);
}
}
}
printf("ext2fs_test_bit appears to be correct\n");
/* Test ext2fs_set_bit */
memset(testarray, 0, sizeof(testarray));
for (i=0; bits_list[i] > 0; i++) {
ext2fs_set_bit(bits_list[i], testarray);
}
if (memcmp(testarray, bitarray, sizeof(testarray)) == 0) {
printf("ext2fs_set_bit test succeeded.\n");
} else {
printf("ext2fs_set_bit test failed.\n");
for (i=0; i < sizeof(testarray); i++) {
printf("%02x ", testarray[i]);
}
printf("\n");
exit(1);
}
for (i=0; bits_list[i] > 0; i++) {
ext2fs_clear_bit(bits_list[i], testarray);
}
for (i=0; i < sizeof(testarray); i++) {
if (testarray[i]) {
printf("ext2fs_clear_bit failed, "
"testarray[%d] is %d\n", i, testarray[i]);
exit(1);
}
}
printf("ext2fs_clear_bit test succeed.\n");
/* Do bigarray test */
bigarray = malloc(1 << 29);
if (!bigarray) {
fprintf(stderr, "Failed to allocate scratch memory!\n");
exit(1);
}
bigarray[BIG_TEST_BIT >> 3] = 0;
ext2fs_set_bit(BIG_TEST_BIT, bigarray);
printf("big bit number (%u) test: %d, expected %d\n", BIG_TEST_BIT,
bigarray[BIG_TEST_BIT >> 3], (1 << (BIG_TEST_BIT & 7)));
if (bigarray[BIG_TEST_BIT >> 3] != (1 << (BIG_TEST_BIT & 7)))
exit(1);
ext2fs_clear_bit(BIG_TEST_BIT, bigarray);
printf("big bit number (%u) test: %d, expected 0\n", BIG_TEST_BIT,
bigarray[BIG_TEST_BIT >> 3], 0);
if (bigarray[BIG_TEST_BIT >> 3] != 0)
exit(1);
printf("ext2fs_set_bit big_test successful\n");
/* Now test ext2fs_fast_set_bit */
memset(testarray, 0, sizeof(testarray));
for (i=0; bits_list[i] > 0; i++) {
ext2fs_fast_set_bit(bits_list[i], testarray);
}
if (memcmp(testarray, bitarray, sizeof(testarray)) == 0) {
printf("ext2fs_fast_set_bit test succeeded.\n");
} else {
printf("ext2fs_fast_set_bit test failed.\n");
for (i=0; i < sizeof(testarray); i++) {
printf("%02x ", testarray[i]);
}
printf("\n");
exit(1);
}
for (i=0; bits_list[i] > 0; i++) {
ext2fs_clear_bit(bits_list[i], testarray);
}
for (i=0; i < sizeof(testarray); i++) {
if (testarray[i]) {
printf("ext2fs_clear_bit failed, "
"testarray[%d] is %d\n", i, testarray[i]);
exit(1);
}
}
printf("ext2fs_clear_bit test succeed.\n");
bigarray[BIG_TEST_BIT >> 3] = 0;
ext2fs_fast_set_bit(BIG_TEST_BIT, bigarray);
printf("big bit number (%u) test: %d, expected %d\n", BIG_TEST_BIT,
bigarray[BIG_TEST_BIT >> 3], (1 << (BIG_TEST_BIT & 7)));
if (bigarray[BIG_TEST_BIT >> 3] != (1 << (BIG_TEST_BIT & 7)))
exit(1);
ext2fs_fast_clear_bit(BIG_TEST_BIT, bigarray);
printf("big bit number (%u) test: %d, expected 0\n", BIG_TEST_BIT,
bigarray[BIG_TEST_BIT >> 3], 0);
if (bigarray[BIG_TEST_BIT >> 3] != 0)
exit(1);
printf("ext2fs_fast_set_bit big_test successful\n");
exit(0);
}
static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
dgrp_t i;
unsigned int j;
int block_nbytes, inode_nbytes;
unsigned int nbits;
errcode_t retval;
char *block_bitmap, *inode_bitmap;
char *block_buf, *inode_buf;
int lazy_flag = 0;
blk_t blk;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
if (EXT2_HAS_COMPAT_FEATURE(fs->super,
EXT2_FEATURE_COMPAT_LAZY_BG))
lazy_flag = 1;
inode_nbytes = block_nbytes = 0;
block_bitmap = inode_bitmap = 0;
if (do_block) {
block_bitmap = fs->block_map->bitmap;
block_nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
retval = ext2fs_get_mem(fs->blocksize, &block_buf);
if (retval)
return retval;
memset(block_buf, 0xff, fs->blocksize);
}
if (do_inode) {
inode_bitmap = fs->inode_map->bitmap;
inode_nbytes = (size_t)
((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
retval = ext2fs_get_mem(fs->blocksize, &inode_buf);
if (retval)
return retval;
memset(inode_buf, 0xff, fs->blocksize);
}
for (i = 0; i < fs->group_desc_count; i++) {
if (!block_bitmap || !do_block)
goto skip_block_bitmap;
if (lazy_flag && fs->group_desc[i].bg_flags &
EXT2_BG_BLOCK_UNINIT)
goto skip_this_block_bitmap;
memcpy(block_buf, block_bitmap, block_nbytes);
if (i == fs->group_desc_count - 1) {
/* Force bitmap padding for the last group */
nbits = ((fs->super->s_blocks_count
- fs->super->s_first_data_block)
% EXT2_BLOCKS_PER_GROUP(fs->super));
if (nbits)
for (j = nbits; j < fs->blocksize * 8; j++)
ext2fs_set_bit(j, block_buf);
}
blk = fs->group_desc[i].bg_block_bitmap;
if (blk) {
#ifdef EXT2_BIG_ENDIAN_BITMAPS
if (!((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
(fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)))
ext2fs_swap_bitmap(fs, block_buf,
block_nbytes);
#endif
retval = io_channel_write_blk(fs->io, blk, 1,
block_buf);
if (retval)
return EXT2_ET_BLOCK_BITMAP_WRITE;
}
skip_this_block_bitmap:
block_bitmap += block_nbytes;
skip_block_bitmap:
if (!inode_bitmap || !do_inode)
continue;
if (lazy_flag && fs->group_desc[i].bg_flags &
EXT2_BG_INODE_UNINIT)
goto skip_this_inode_bitmap;
memcpy(inode_buf, inode_bitmap, inode_nbytes);
blk = fs->group_desc[i].bg_inode_bitmap;
if (blk) {
#ifdef EXT2_BIG_ENDIAN_BITMAPS
if (!((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
(fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)))
ext2fs_swap_bitmap(fs, inode_buf,
inode_nbytes);
#endif
retval = io_channel_write_blk(fs->io, blk, 1,
inode_buf);
if (retval)
return EXT2_ET_INODE_BITMAP_WRITE;
}
skip_this_inode_bitmap:
inode_bitmap += inode_nbytes;
}
if (do_block) {
fs->flags &= ~EXT2_FLAG_BB_DIRTY;
ext2fs_free_mem(&block_buf);
}
if (do_inode) {
fs->flags &= ~EXT2_FLAG_IB_DIRTY;
ext2fs_free_mem(&inode_buf);
}
return 0;
}
