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Kernel+Userland: Implement mknod() syscall and add a /bin/mknod program.

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This commit is contained in:
Andreas Kling 2019-05-03 22:59:58 +02:00
parent abb5c890e0
commit 8b249bd09b
15 changed files with 107 additions and 14 deletions
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30
Kernel/FileSystem/VirtualFileSystem.cpp
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@ -195,6 +195,32 @@ KResultOr<Retained<FileDescriptor>> VFS::open(StringView path, int options, mode
return FileDescriptor::create(*inode);
}
KResult VFS::mknod(StringView path, mode_t mode, dev_t dev, Inode& base)
{
if (!is_regular_file(mode) && !is_block_device(mode) && !is_character_device(mode) && !is_fifo(mode) && !is_socket(mode))
return KResult(-EINVAL);
RetainPtr<Inode> parent_inode;
auto existing_file_or_error = resolve_path_to_inode(path, base, &parent_inode);
if (!existing_file_or_error.is_error())
return KResult(-EEXIST);
if (!parent_inode)
return KResult(-ENOENT);
if (existing_file_or_error.error() != -ENOENT)
return existing_file_or_error.error();
if (!parent_inode->metadata().may_write(current->process()))
return KResult(-EACCES);
FileSystemPath p(path);
dbgprintf("VFS::mknod: '%s' mode=%o dev=%u in %u:%u\n", p.basename().characters(), mode, dev, parent_inode->fsid(), parent_inode->index());
int error;
auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), mode, 0, dev, error);
if (!new_file)
return KResult(error);
return KSuccess;
}
KResultOr<Retained<FileDescriptor>> VFS::create(StringView path, int options, mode_t mode, Inode& base)
{
(void)options;
@ -218,7 +244,7 @@ KResultOr<Retained<FileDescriptor>> VFS::create(StringView path, int options, mo
FileSystemPath p(path);
dbgprintf("VFS::create_file: '%s' in %u:%u\n", p.basename().characters(), parent_inode->fsid(), parent_inode->index());
int error;
auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), mode, 0, error);
auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), mode, 0, 0, error);
if (!new_file)
return KResult(error);
@ -469,7 +495,7 @@ KResult VFS::symlink(StringView target, StringView linkpath, Inode& base)
FileSystemPath p(linkpath);
dbgprintf("VFS::symlink: '%s' (-> '%s') in %u:%u\n", p.basename().characters(), target.characters(), parent_inode->fsid(), parent_inode->index());
int error;
auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), 0120644, 0, error);
auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), 0120644, 0, 0, error);
if (!new_file)
return KResult(error);
ssize_t nwritten = new_file->write_bytes(0, target.length(), (const byte*)target.characters(), nullptr);