Bananymous
/
banan-os
1
1
Fork 1
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Kernel: Add hardlink support to USTAR 

Also handle file types L and K for long file names and link names
This commit is contained in:
Bananymous 2025-08-27 01:05:21 +03:00
parent 51cd951b4c
commit 6976a2dae7
1 changed files with 80 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

92
kernel/kernel/FS/USTARModule.cpp
View File

@ -36,6 +36,9 @@ namespace Kernel
return BAN::Error::from_errno(ENOMEM);
BAN::ScopeGuard _([temp_page] { kfree(temp_page); });
BAN::String next_file_name;
BAN::String next_link_name;
size_t offset = 0;
while (offset + 512 <= module.size)
{
@ -87,12 +90,13 @@ namespace Kernel
auto parent_inode = filesystem->root_inode();
auto file_path_parts = TRY(BAN::StringView(file_path).split('/'));
auto file_path_parts = TRY(BAN::StringView(next_file_name.empty() ? file_path : next_file_name.sv()).split('/'));
for (size_t i = 0; i < file_path_parts.size() - 1; i++)
parent_inode = TRY(parent_inode->find_inode(file_path_parts[i]));
switch (file_type)
{
case 'L': case 'K': break;
case REGTYPE:
case AREGTYPE: file_mode |= Inode::Mode::IFREG; break;
case LNKTYPE: break;
@ -102,12 +106,34 @@ namespace Kernel
case DIRTYPE: file_mode |= Inode::Mode::IFDIR; break;
case FIFOTYPE: file_mode |= Inode::Mode::IFIFO; break;
default:
ASSERT_NOT_REACHED();
panic("unknown file type {}", file_type);
}
auto file_name_sv = file_path_parts.back();
if (file_type == DIRTYPE)
if (file_type == 'L' || file_type == 'K')
{
auto& target = (file_type == 'L') ? next_file_name : next_link_name;
TRY(target.resize(file_size));
size_t nwritten = 0;
while (nwritten < file_size)
{
const paddr_t paddr = module.start + offset + 512 + nwritten;
PageTable::with_fast_page(paddr & PAGE_ADDR_MASK, [&] {
memcpy(temp_page, PageTable::fast_page_as_ptr(), PAGE_SIZE);
});
const size_t page_off = paddr % PAGE_SIZE;
const size_t to_write = BAN::Math::min(file_size - nwritten, PAGE_SIZE - page_off);
memcpy(target.data() + nwritten, temp_page + page_off, to_write);
nwritten += to_write;
}
while (!target.empty() && target.back() == '\0')
target.pop_back();
}
else if (file_type == DIRTYPE)
{
if (file_name_sv == "."_sv)
; // NOTE: don't create "." (root)
@ -116,7 +142,38 @@ namespace Kernel
}
else if (file_type == LNKTYPE)
{
dwarnln("TODO: hardlink");
BAN::StringView link_name;
char link_buffer[101] {};
if (!next_link_name.empty())
link_name = next_link_name.sv();
else
{
const paddr_t paddr = module.start + offset;
PageTable::with_fast_page(paddr & PAGE_ADDR_MASK, [&] {
memcpy(link_buffer, PageTable::fast_page_as_ptr((paddr % PAGE_SIZE) + 157), 100);
});
link_name = link_buffer;
}
auto target_inode = filesystem->root_inode();
auto link_path_parts = TRY(link_name.split('/'));
for (const auto part : link_path_parts)
{
auto find_result = target_inode->find_inode(part);
if (!find_result.is_error())
target_inode = find_result.release_value();
else
{
target_inode = {};
break;
}
}
if (target_inode)
if (auto ret = parent_inode->link_inode(file_name_sv, target_inode); ret.is_error())
dwarnln("failed to create hardlink '{}': {}", file_name_sv, ret.error());
}
else if (file_type == SYMTYPE)
{
@ -124,17 +181,22 @@ namespace Kernel
dwarnln("failed to create symlink '{}': {}", file_name_sv, ret.error());
else
{
char link_target[101] {};
const paddr_t paddr = module.start + offset;
PageTable::with_fast_page(paddr & PAGE_ADDR_MASK, [&] {
memcpy(link_target, PageTable::fast_page_as_ptr((paddr % PAGE_SIZE) + 157), 100);
});
BAN::StringView link_name;
if (link_target[0])
char link_buffer[101] {};
if (!next_link_name.empty())
link_name = next_link_name.sv();
else
{
auto inode = TRY(parent_inode->find_inode(file_name_sv));
TRY(inode->set_link_target(link_target));
const paddr_t paddr = module.start + offset;
PageTable::with_fast_page(paddr & PAGE_ADDR_MASK, [&] {
memcpy(link_buffer, PageTable::fast_page_as_ptr((paddr % PAGE_SIZE) + 157), 100);
});
link_name = link_buffer;
}
auto inode = TRY(parent_inode->find_inode(file_name_sv));
TRY(inode->set_link_target(link_name));
}
}
else
@ -164,6 +226,12 @@ namespace Kernel
}
}
if (file_type != 'L' && file_type != 'K')
{
next_file_name.clear();
next_link_name.clear();
}
offset += 512 + file_size;
if (auto rem = offset % 512)
offset += 512 - rem;