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ext2: Implement triply indirect blocks

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This commit is contained in:
mintsuki 2021-09-07 10:35:34 +02:00
parent 3dbd494f87
commit 9459207ab3
1 changed files with 21 additions and 9 deletions
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30
stage23/fs/ext2.s2.c
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@ -178,16 +178,28 @@ static uint32_t *create_alloc_map(struct ext2_file_handle *fd,
// Double indirect block
block -= entries_per_block;
uint32_t index = block / entries_per_block;
if (index >= entries_per_block) {
// Triple indirect block
panic("ext2: triply indirect blocks unsupported");
}
uint32_t indirect_block;
volume_read(
fd->part, &indirect_block,
inode->i_blocks[13] * fd->block_size + index * sizeof(uint32_t),
sizeof(uint32_t)
);
if (index >= entries_per_block) {
uint32_t first_index = index / entries_per_block;
uint32_t first_indirect_block;
volume_read(
fd->part, &first_indirect_block,
inode->i_blocks[14] * fd->block_size + first_index * sizeof(uint32_t),
sizeof(uint32_t)
);
uint32_t second_index = index % entries_per_block;
volume_read(
fd->part, &indirect_block,
first_indirect_block * fd->block_size + second_index * sizeof(uint32_t),
sizeof(uint32_t)
);
} else {
volume_read(
fd->part, &indirect_block,
inode->i_blocks[13] * fd->block_size + index * sizeof(uint32_t),
sizeof(uint32_t)
);
}
for (uint32_t j = 0; j < entries_per_block; j++) {
if (i + j >= inode->i_blocks_count)
return alloc_map;