/**
* Write to the 'block'th block within an inode 'inode' from the buffer 'buf'.
* In other words, this function writes to the actual file content.
* @return the actual block number read from.
*/
uint32_t ext2_disk_inode_write_block(ext2_inodetable_t *inode, uint32_t no, uint32_t block, uint8_t *buf) {
/* We must allocate blocks up to this point to account for unused space in the middle. */
while (block >= inode->blocks) {
kprintf("[kernel/ext2] Need to allocate blocks, have %d, want to write to #%d.\n", inode->blocks, block);
ext2_disk_inode_alloc_block(inode, no, inode->blocks);
if (block != inode->blocks - 1) {
/* Clear the block */
uint32_t real_block = ext2_get_real_block(inode, inode->blocks - 1);
uint8_t empty[1024] = {0};
memset(empty, 0x00, 1024);
ext2_disk_write_block(real_block, empty);
}
}
// The real work to write to a block of an inode.
uint32_t real_block = ext2_get_real_block(inode, block);
ext2_disk_write_block(real_block, buf);
return real_block;
}
/**
* Write to the 'block'th block within an inode 'inode' from the buffer 'buf'.
* In other words, this function writes to the actual file content.
* @return the actual block number read from.
*/
uint32_t ext2_disk_inode_write_block(ext2_inodetable_t *inode, uint32_t inode_no, uint32_t block, uint8_t *buf) {
/* We must allocate blocks up to this point to account for unused space in the middle. */
while (block >= inode->blocks) {
ext2_disk_inode_alloc_block(inode, inode_no, inode->blocks);
if (block != inode->blocks - 1) {
/* Clear the block */
uint32_t real_block = ext2_get_real_block(inode, inode->blocks - 1);
uint8_t * empty = malloc(BLOCKSIZE);
memset(empty, 0x00, BLOCKSIZE);
ext2_disk_write_block(real_block, empty);
free(empty);
}
}
// The real work to write to a block of an inode.
uint32_t real_block = ext2_get_real_block(inode, block);
debug_print(INFO, "virtual block %d maps to real block %d", block, real_block);
ext2_disk_write_block(real_block, buf);
return real_block;
}
