void swap_filesys(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
#ifdef RESOURCE_TRACK
struct resource_track rtrack;
init_resource_track(&rtrack);
#endif
if (!(ctx->options & E2F_OPT_PREEN))
printf(_("Pass 0: Doing byte-swap of filesystem\n"));
#ifdef MTRACE
mtrace_print("Byte swap");
#endif
if (fs->super->s_mnt_count) {
fprintf(stderr, _("%s: the filesystem must be freshly "
"checked using fsck\n"
"and not mounted before trying to "
"byte-swap it.\n"), ctx->device_name);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
fs->flags &= ~(EXT2_FLAG_SWAP_BYTES|
EXT2_FLAG_SWAP_BYTES_WRITE);
fs->flags |= EXT2_FLAG_SWAP_BYTES_READ;
} else {
fs->flags &= ~EXT2_FLAG_SWAP_BYTES_READ;
fs->flags |= EXT2_FLAG_SWAP_BYTES_WRITE;
}
swap_inodes(ctx);
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return;
if (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)
fs->flags |= EXT2_FLAG_SWAP_BYTES;
fs->flags &= ~(EXT2_FLAG_SWAP_BYTES_READ|
EXT2_FLAG_SWAP_BYTES_WRITE);
#ifdef EXT2_BIG_ENDIAN_BITMAPS
e2fsck_read_bitmaps(ctx);
ext2fs_swap_bitmap(fs->inode_map);
ext2fs_swap_bitmap(fs->block_map);
fs->flags |= EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;
#endif
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
ext2fs_flush(fs);
fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
#ifdef RESOURCE_TRACK
if (ctx->options & E2F_OPT_TIME2)
print_resource_track(_("Byte swap"), &rtrack);
#endif
}
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;
}
errcode_t ext2fs_write_inode_bitmap(ext2_filsys fs)
{
dgrp_t i;
size_t nbytes;
errcode_t retval;
char * inode_bitmap = fs->inode_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 (!inode_bitmap)
return 0;
nbytes = (size_t) ((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
//retval = ext2fs_get_mem(fs->blocksize, &bitmap_block);
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, inode_bitmap, 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, bitmap_block, nbytes);
#endif
retval = io_channel_write_blk(fs->io, blk, 1,
bitmap_block);
if (retval)
return EXT2_ET_INODE_BITMAP_WRITE;
}
inode_bitmap += nbytes;
}
io_channel_reopen(fs->io, O_RDWR);
fs->flags &= ~EXT2_FLAG_IB_DIRTY;
free(bitmap_block);
return 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;
}
static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
dgrp_t i;
char *block_bitmap = 0, *inode_bitmap = 0;
char *buf;
errcode_t retval;
int block_nbytes = (int) EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
int inode_nbytes = (int) EXT2_INODES_PER_GROUP(fs->super) / 8;
int lazy_flag = 0;
blk_t blk;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
fs->write_bitmaps = ext2fs_write_bitmaps;
if (EXT2_HAS_COMPAT_FEATURE(fs->super,
EXT2_FEATURE_COMPAT_LAZY_BG))
lazy_flag = 1;
retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
if (retval)
return retval;
if (do_block) {
if (fs->block_map)
ext2fs_free_block_bitmap(fs->block_map);
sprintf(buf, "block bitmap for %s", fs->device_name);
retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
if (retval)
goto cleanup;
block_bitmap = fs->block_map->bitmap;
}
if (do_inode) {
if (fs->inode_map)
ext2fs_free_inode_bitmap(fs->inode_map);
sprintf(buf, "inode bitmap for %s", fs->device_name);
retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
if (retval)
goto cleanup;
inode_bitmap = fs->inode_map->bitmap;
}
ext2fs_free_mem(&buf);
if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
if (inode_bitmap) {
blk = (fs->image_header->offset_inodemap /
fs->blocksize);
retval = io_channel_read_blk(fs->image_io, blk,
-(inode_nbytes * fs->group_desc_count),
inode_bitmap);
if (retval)
goto cleanup;
}
if (block_bitmap) {
blk = (fs->image_header->offset_blockmap /
fs->blocksize);
retval = io_channel_read_blk(fs->image_io, blk,
-(block_nbytes * fs->group_desc_count),
block_bitmap);
if (retval)
goto cleanup;
}
return 0;
}
for (i = 0; i < fs->group_desc_count; i++) {
if (block_bitmap) {
blk = fs->group_desc[i].bg_block_bitmap;
if (lazy_flag && fs->group_desc[i].bg_flags &
EXT2_BG_BLOCK_UNINIT)
blk = 0;
if (blk) {
retval = io_channel_read_blk(fs->io, blk,
-block_nbytes, block_bitmap);
if (retval) {
retval = EXT2_ET_BLOCK_BITMAP_READ;
goto cleanup;
}
#ifdef EXT2_BIG_ENDIAN_BITMAPS
if (!((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
(fs->flags & EXT2_FLAG_SWAP_BYTES_READ)))
ext2fs_swap_bitmap(fs, block_bitmap, block_nbytes);
#endif
} else
memset(block_bitmap, 0xff, block_nbytes);
block_bitmap += block_nbytes;
}
if (inode_bitmap) {
blk = fs->group_desc[i].bg_inode_bitmap;
if (lazy_flag && fs->group_desc[i].bg_flags &
EXT2_BG_INODE_UNINIT)
blk = 0;
if (blk) {
retval = io_channel_read_blk(fs->io, blk,
-inode_nbytes, inode_bitmap);
if (retval) {
retval = EXT2_ET_INODE_BITMAP_READ;
goto cleanup;
}
#ifdef EXT2_BIG_ENDIAN_BITMAPS
if (!((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
(fs->flags & EXT2_FLAG_SWAP_BYTES_READ)))
ext2fs_swap_bitmap(fs, inode_bitmap, inode_nbytes);
#endif
} else
memset(inode_bitmap, 0xff, inode_nbytes);
inode_bitmap += inode_nbytes;
}
}
return 0;
cleanup:
if (do_block) {
ext2fs_free_mem(&fs->block_map);
fs->block_map = 0;
}
if (do_inode) {
ext2fs_free_mem(&fs->inode_map);
fs->inode_map = 0;
}
if (buf)
ext2fs_free_mem(&buf);
return retval;
}
