fs: make operator<() for search ioctl inline

Perf blames this operator for >1% of instructions with -O2, and
70% of instructions without -O2.

Let the compiler inline the function.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

include/crucible/fs.h

@@ -169,6 +169,12 @@ namespace crucible {
 		bool operator<(const BtrfsIoctlSearchHeader &that) const;
 	};
 
+	// Perf blames this function for a few percent overhead; move it here so it can be inline
+	inline bool BtrfsIoctlSearchHeader::operator<(const BtrfsIoctlSearchHeader &that) const
+	{
+		return tie(objectid, type, offset, len, transid) < tie(that.objectid, that.type, that.offset, that.len, that.transid);
+	}
+
 	ostream & operator<<(ostream &os, const btrfs_ioctl_search_header &hdr);
 	ostream & operator<<(ostream &os, const BtrfsIoctlSearchHeader &hdr);
 

lib/fs.cc

@@ -756,12 +756,6 @@ namespace crucible {
 		return offset + len;
 	}
 
-	bool
-	BtrfsIoctlSearchHeader::operator<(const BtrfsIoctlSearchHeader &that) const
-	{
-		return tie(objectid, type, offset, len, transid) < tie(that.objectid, that.type, that.offset, that.len, that.transid);
-	}
-
 	bool
 	BtrfsIoctlSearchKey::do_ioctl_nothrow(int fd)
 	{