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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
Notes: sideshowbarker 2024-07-18 02:16:48 +09:00 
Author: https://github.com/SeekingBlues
Commit: https://github.com/SerenityOS/serenity/commit/3d174e3ad20
Pull-request: https://github.com/SerenityOS/serenity/pull/10508
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;
};

33
Kernel/ProcessExposed.cpp
View File

@ -153,6 +153,39 @@ KResult ProcFSGlobalInformation::refresh_data(OpenFileDescription& description)
return KSuccess;
}
KResult ProcFSSystemBoolean::try_generate(KBufferBuilder& builder)
{
return builder.appendff("{}\n", static_cast<int>(value()));
}
KResultOr<size_t> ProcFSSystemBoolean::write_bytes(off_t, size_t count, const UserOrKernelBuffer& buffer, OpenFileDescription*)
{
if (count != 1)
return EINVAL;
MutexLocker locker(m_refresh_lock);
char value = 0;
TRY(buffer.read(&value, 1));
if (value == '0')
set_value(false);
else if (value == '1')
set_value(true);
else
return EINVAL;
return 1;
}
KResult ProcFSSystemBoolean::truncate(u64 size)
{
if (size != 0)
return EPERM;
return KSuccess;
}
KResult ProcFSSystemBoolean::set_mtime(time_t)
{
return KSuccess;
}
KResultOr<size_t> ProcFSExposedLink::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
{
VERIFY(offset == 0);

18
Kernel/ProcessExposed.h
View File

@ -69,7 +69,9 @@ public:
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { VERIFY_NOT_REACHED(); }
virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
virtual KResultOr<NonnullRefPtr<ProcFSExposedComponent>> lookup(StringView) { VERIFY_NOT_REACHED(); };
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*) { return KResult(EROFS); }
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*) { return EROFS; }
virtual KResult truncate(u64) { return EPERM; }
virtual KResult set_mtime(time_t) { return ENOTIMPL; }
virtual mode_t required_mode() const { return 0444; }
virtual UserID owner_user() const { return 0; }
@ -182,10 +184,16 @@ protected:
: ProcFSGlobalInformation(name)
{
}
virtual KResult try_generate(KBufferBuilder& builder) override
{
return builder.appendff("{}\n", value());
}
private:
// ^ProcFSGlobalInformation
virtual KResult try_generate(KBufferBuilder&) override final;
// ^ProcFSExposedComponent
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*) override final;
virtual mode_t required_mode() const override final { return 0644; }
virtual KResult truncate(u64) override final;
virtual KResult set_mtime(time_t) override final;
};
}