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Kernel/ProcFS: Provide a way to write to ProcFS inodes

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ProcFSGlobalInode now calls `write_bytes()`, `truncate()` and
`set_mtime()` on its associated component. This allows us to write 0 or
1 to a ProcFSSystemBoolean component to toggle a boolean value.
This commit is contained in:
SeekingBlues 2021-10-16 17:35:59 -04:00 • committed by Andreas Kling
parent f8e89306e0
commit 3d174e3ad2
4 changed files with 58 additions and 11 deletions
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15
Kernel/FileSystem/ProcFS.cpp
View file

@ -99,11 +99,6 @@ KResult ProcFSInode::chown(UserID, GroupID)
return EPERM;
}
KResult ProcFSInode::truncate(u64)
{
return EPERM;
}
KResultOr<NonnullRefPtr<ProcFSGlobalInode>> ProcFSGlobalInode::try_create(const ProcFS& fs, const ProcFSExposedComponent& component)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSGlobalInode(fs, component));
@ -151,6 +146,16 @@ KResultOr<NonnullRefPtr<Inode>> ProcFSGlobalInode::lookup(StringView)
VERIFY_NOT_REACHED();
}
KResult ProcFSGlobalInode::truncate(u64 size)
{
return m_associated_component->truncate(size);
}
KResult ProcFSGlobalInode::set_mtime(time_t time)
{
return m_associated_component->set_mtime(time);
}
InodeMetadata ProcFSGlobalInode::metadata() const
{
MutexLocker locker(m_inode_lock);

3
Kernel/FileSystem/ProcFS.h
View file

@ -62,7 +62,6 @@ protected:
virtual KResult remove_child(const StringView& name) override final;
virtual KResult chmod(mode_t) override final;
virtual KResult chown(UserID, GroupID) override final;
virtual KResult truncate(u64) override final;
};
class ProcFSGlobalInode : public ProcFSInode {
@ -84,6 +83,8 @@ protected:
virtual InodeMetadata metadata() const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<NonnullRefPtr<Inode>> lookup(StringView) override;
virtual KResult truncate(u64) override final;
virtual KResult set_mtime(time_t) override final;
NonnullRefPtr<ProcFSExposedComponent> m_associated_component;
};