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Kernel: Support open() with O_CREAT.

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It's now possible to create zero-length files! :^)
Also hook up the new functionality in /bin/touch.
This commit is contained in:
Andreas Kling 2019-01-22 00:58:13 +01:00
parent a47f33bed3
commit f70136a324
Notes: sideshowbarker 2024-07-19 15:59:09 +09:00
9 changed files with 108 additions and 39 deletions
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43
VirtualFileSystem/VirtualFileSystem.cpp
View file

@ -136,12 +136,15 @@ RetainPtr<FileDescriptor> VFS::open(RetainPtr<CharacterDevice>&& device, int& er
return FileDescriptor::create(move(device));
}
RetainPtr<FileDescriptor> VFS::open(const String& path, int& error, int options, InodeIdentifier base)
RetainPtr<FileDescriptor> VFS::open(const String& path, int& error, int options, mode_t mode, InodeIdentifier base)
{
auto inode_id = resolve_path(path, base, error, options);
auto inode = get_inode(inode_id);
if (!inode)
if (!inode) {
if (options & O_CREAT)
return create(path, error, options, mode, base);
return nullptr;
}
auto metadata = inode->metadata();
if (metadata.isCharacterDevice()) {
auto it = m_character_devices.find(encodedDevice(metadata.majorDevice, metadata.minorDevice));
@ -154,13 +157,37 @@ RetainPtr<FileDescriptor> VFS::open(const String& path, int& error, int options,
return FileDescriptor::create(move(inode));
}
RetainPtr<FileDescriptor> VFS::create(const String& path, InodeIdentifier base, int& error)
RetainPtr<FileDescriptor> VFS::create(const String& path, int& error, int options, mode_t mode, InodeIdentifier base)
{
// FIXME: Do the real thing, not just this fake thing!
(void) path;
(void) base;
m_root_inode->fs().create_inode(m_root_inode->fs().root_inode(), "empty", 0100644, 0, error);
return nullptr;
(void) options;
error = -EWHYTHO;
// FIXME: This won't work nicely across mount boundaries.
FileSystemPath p(path);
if (!p.is_valid()) {
error = -EINVAL;
return nullptr;
}
InodeIdentifier parent_dir;
auto existing_dir = resolve_path(path, base, error, 0, &parent_dir);
if (existing_dir.is_valid()) {
error = -EEXIST;
return nullptr;
}
if (!parent_dir.is_valid()) {
error = -ENOENT;
return nullptr;
}
if (error != -ENOENT) {
return nullptr;
}
dbgprintf("VFS::create_file: '%s' in %u:%u\n", p.basename().characters(), parent_dir.fsid(), parent_dir.index());
auto new_file = base.fs()->create_inode(base.fs()->root_inode(), p.basename(), mode, 0, error);
if (!new_file)
return nullptr;
error = 0;
return FileDescriptor::create(move(new_file));
}
bool VFS::mkdir(const String& path, mode_t mode, InodeIdentifier base, int& error)