void inode_attach_resize(struct ext4_inode *inode,
struct block_allocation *alloc)
{
u32 block_len = block_allocation_len(alloc);
u32 superblocks = block_len / info.bg_desc_reserve_blocks;
u32 i, j;
u64 blocks;
u64 size;
if (block_len % info.bg_desc_reserve_blocks)
critical_error("reserved blocks not a multiple of %d",
info.bg_desc_reserve_blocks);
append_oob_allocation(alloc, 1);
u32 dind_block = get_oob_block(alloc, 0);
u32 *dind_block_data = calloc(info.block_size, 1);
if (!dind_block_data)
critical_error_errno("calloc");
queue_data_block((u8 *)dind_block_data, info.block_size, dind_block);
u32 *ind_block_data = calloc(info.block_size, info.bg_desc_reserve_blocks);
if (!ind_block_data)
critical_error_errno("calloc");
queue_data_block((u8 *)ind_block_data,
info.block_size * info.bg_desc_reserve_blocks,
get_block(alloc, 0));
for (i = 0; i < info.bg_desc_reserve_blocks; i++) {
int r = (i - aux_info.bg_desc_blocks) % info.bg_desc_reserve_blocks;
if (r < 0)
r += info.bg_desc_reserve_blocks;
dind_block_data[i] = get_block(alloc, r);
for (j = 1; j < superblocks; j++) {
u32 b = j * info.bg_desc_reserve_blocks + r;
ind_block_data[r * aux_info.blocks_per_ind + j - 1] = get_block(alloc, b);
}
}
u32 last_block = EXT4_NDIR_BLOCKS + aux_info.blocks_per_ind +
aux_info.blocks_per_ind * (info.bg_desc_reserve_blocks - 1) +
superblocks - 2;
blocks = ((u64)block_len + 1) * info.block_size / 512;
size = (u64)last_block * info.block_size;
inode->i_block[EXT4_DIND_BLOCK] = dind_block;
inode->i_flags = 0;
inode->i_blocks_lo = blocks;
inode->osd2.linux2.l_i_blocks_high = blocks >> 32;
inode->i_size_lo = size;
inode->i_size_high = size >> 32;
}
static void fill_tindirect_block(u32 *tind_block, int len, struct block_allocation *alloc)
{
int i;
u32 dind_block;
for (i = 0; len > 0; i++) {
dind_block = get_oob_block(alloc, 0);
if (advance_oob_blocks(alloc, 1)) {
error("failed to reserve oob block");
return;
}
tind_block[i] = dind_block;
u32 *dind_block_data = calloc(info.block_size, 1);
queue_data_block((u8*)dind_block_data, info.block_size, dind_block);
int dind_block_len = min((int)aux_info.blocks_per_dind, len);
fill_dindirect_block(dind_block_data, dind_block_len, alloc);
len -= dind_block_len;
}
}
static struct block_allocation *do_inode_allocate_extents(
struct ext4_inode *inode, u64 len)
{
u32 block_len = DIV_ROUND_UP(len, info.block_size);
struct block_allocation *alloc = allocate_blocks(block_len + 1);
u32 extent_block = 0;
u32 file_block = 0;
struct ext4_extent *extent;
u64 blocks;
if (alloc == NULL) {
error("Failed to allocate %d blocks\n", block_len + 1);
return NULL;
}
int allocation_len = block_allocation_num_regions(alloc);
if (allocation_len <= 3) {
reduce_allocation(alloc, 1);
} else {
reserve_oob_blocks(alloc, 1);
extent_block = get_oob_block(alloc, 0);
}
if (!extent_block) {
struct ext4_extent_header *hdr =
(struct ext4_extent_header *)&inode->i_block[0];
hdr->eh_magic = EXT4_EXT_MAGIC;
hdr->eh_entries = allocation_len;
hdr->eh_max = 3;
hdr->eh_generation = 0;
hdr->eh_depth = 0;
extent = (struct ext4_extent *)&inode->i_block[3];
} else {
struct ext4_extent_header *hdr =
(struct ext4_extent_header *)&inode->i_block[0];
hdr->eh_magic = EXT4_EXT_MAGIC;
hdr->eh_entries = 1;
hdr->eh_max = 3;
hdr->eh_generation = 0;
hdr->eh_depth = 1;
struct ext4_extent_idx *idx =
(struct ext4_extent_idx *)&inode->i_block[3];
idx->ei_block = 0;
idx->ei_leaf_lo = extent_block;
idx->ei_leaf_hi = 0;
idx->ei_unused = 0;
u8 *data = calloc(info.block_size, 1);
if (!data)
critical_error_errno("calloc");
queue_data_block(data, info.block_size, extent_block);
if (((int)(info.block_size - sizeof(struct ext4_extent_header) /
sizeof(struct ext4_extent))) < allocation_len) {
error("File size %llu is too big to fit in a single extent block\n",
len);
return NULL;
}
hdr = (struct ext4_extent_header *)data;
hdr->eh_magic = EXT4_EXT_MAGIC;
hdr->eh_entries = allocation_len;
hdr->eh_max = (info.block_size - sizeof(struct ext4_extent_header)) /
sizeof(struct ext4_extent);
hdr->eh_generation = 0;
hdr->eh_depth = 0;
extent = (struct ext4_extent *)(data +
sizeof(struct ext4_extent_header));
}
for (; !last_region(alloc); extent++, get_next_region(alloc)) {
u32 region_block;
u32 region_len;
get_region(alloc, ®ion_block, ®ion_len);
extent->ee_block = file_block;
extent->ee_len = region_len;
extent->ee_start_hi = 0;
extent->ee_start_lo = region_block;
file_block += region_len;
}
if (extent_block)
block_len += 1;
blocks = (u64)block_len * info.block_size / 512;
inode->i_flags |= EXT4_EXTENTS_FL;
inode->i_size_lo = len;
inode->i_size_high = len >> 32;
inode->i_blocks_lo = blocks;
inode->osd2.linux2.l_i_blocks_high = blocks >> 32;
rewind_alloc(alloc);
return alloc;
}