Kernel: Implement chown to ext2 and tmpfs

kernel/include/kernel/FS/Ext2/Inode.h

@@ -46,6 +46,7 @@ namespace Kernel
 		virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override;
 		virtual BAN::ErrorOr<void> truncate_impl(size_t) override;
 		virtual BAN::ErrorOr<void> chmod_impl(mode_t) override;
+		virtual BAN::ErrorOr<void> chown_impl(uid_t, gid_t) override;
 		virtual BAN::ErrorOr<void> utimens_impl(const timespec[2]) override;
 		virtual BAN::ErrorOr<void> fsync_impl() override;
 

kernel/include/kernel/FS/TmpFS/Inode.h

@@ -48,6 +48,7 @@ namespace Kernel
 		TmpInode(TmpFileSystem&, ino_t, const TmpInodeInfo&);
 
 		virtual BAN::ErrorOr<void> chmod_impl(mode_t) override;
+		virtual BAN::ErrorOr<void> chown_impl(uid_t, gid_t) override;
 		virtual BAN::ErrorOr<void> utimens_impl(const timespec[2]) override;
 		virtual BAN::ErrorOr<void> fsync_impl() override { return {}; }
 

kernel/kernel/FS/Ext2/Inode.cpp

@@ -289,6 +289,26 @@ namespace Kernel
 		return {};
 	}
 
+	BAN::ErrorOr<void> Ext2Inode::chown_impl(uid_t uid, gid_t gid)
+	{
+		if (m_inode.uid == uid && m_inode.gid == gid)
+			return {};
+
+		const auto old_uid = m_inode.uid;
+		const auto old_gid = m_inode.gid;
+
+		m_inode.uid = uid;
+		m_inode.gid = gid;
+		if (auto ret = sync(); ret.is_error())
+		{
+			m_inode.uid = old_uid;
+			m_inode.gid = old_gid;
+			return ret.release_error();
+		}
+
+		return {};
+	}
+
 	BAN::ErrorOr<void> Ext2Inode::utimens_impl(const timespec times[2])
 	{
 		const uint32_t old_times[2] {

kernel/kernel/FS/TmpFS/Inode.cpp

@@ -100,6 +100,13 @@ namespace Kernel
 		return {};
 	}
 
+	BAN::ErrorOr<void> TmpInode::chown_impl(uid_t new_uid, gid_t new_gid)
+	{
+		m_inode_info.uid = new_uid;
+		m_inode_info.gid = new_gid;
+		return {};
+	}
+
 	BAN::ErrorOr<void> TmpInode::utimens_impl(const timespec times[2])
 	{
 		if (times[0].tv_nsec != UTIME_OMIT)