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Kernel: Ext2 can now read from non-block-size aligned offsets

This commit is contained in:
Bananymous 2023-03-21 19:04:01 +02:00
parent b21348379f
commit 9b500842a0
1 changed files with 8 additions and 8 deletions
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14
kernel/kernel/FS/Ext2.cpp
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@ -227,8 +227,6 @@ namespace Kernel
const uint32_t block_size = 1024 << m_fs.superblock().log_block_size; const uint32_t block_size = 1024 << m_fs.superblock().log_block_size;
ASSERT(offset % block_size == 0);
const uint32_t first_block = offset / block_size; const uint32_t first_block = offset / block_size;
const uint32_t last_block = BAN::Math::div_round_up<uint32_t>(offset + count, block_size); const uint32_t last_block = BAN::Math::div_round_up<uint32_t>(offset + count, block_size);
@ -236,16 +234,18 @@ namespace Kernel
for (uint32_t block = first_block; block < last_block; block++) for (uint32_t block = first_block; block < last_block; block++)
{ {
uint32_t data_block = TRY(data_block_index(block)); uint32_t block_index = TRY(data_block_index(block));
auto block_data = TRY(m_fs.read_block(data_block)); auto block_data = TRY(m_fs.read_block(block_index));
ASSERT(block_data.size() == block_size);
uint32_t to_copy = BAN::Math::min<uint32_t>(block_data.size(), count - n_read); uint32_t copy_offset = (offset + n_read) % block_size;
uint32_t to_copy = BAN::Math::min<uint32_t>(block_size - copy_offset, count - n_read);
memcpy((uint8_t*)buffer + n_read, block_data.data() + copy_offset, to_copy);
memcpy((uint8_t*)buffer + n_read, block_data.data(), to_copy);
n_read += to_copy; n_read += to_copy;
} }
return count; return n_read;
} }
BAN::ErrorOr<BAN::RefPtr<Inode>> Ext2Inode::directory_find_impl(BAN::StringView file_name) BAN::ErrorOr<BAN::RefPtr<Inode>> Ext2Inode::directory_find_impl(BAN::StringView file_name)