1 /* 2 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 #ifndef OS_LINUX_GC_Z_ZBACKINGFILE_LINUX_HPP 25 #define OS_LINUX_GC_Z_ZBACKINGFILE_LINUX_HPP 26 27 #include "memory/allocation.hpp" 28 29 class ZErrno; 30 31 class ZBackingFile { 32 private: 33 int _fd; 34 size_t _size; 35 uint64_t _filesystem; 36 size_t _block_size; 37 size_t _available; 38 bool _initialized; 39 40 void warn_available_space(size_t max) const; 41 void warn_max_map_count(size_t max) const; 42 43 int create_mem_fd(const char* name) const; 44 int create_file_fd(const char* name) const; 45 int create_fd(const char* name) const; 46 47 bool is_tmpfs() const; 48 bool is_hugetlbfs() const; 49 bool tmpfs_supports_transparent_huge_pages() const; 50 51 ZErrno fallocate_compat_ftruncate(size_t size) const; 52 ZErrno fallocate_compat_mmap(size_t offset, size_t length, bool reserve_only) const; 53 ZErrno fallocate_compat_pwrite(size_t offset, size_t length) const; 54 ZErrno fallocate_fill_hole_compat(size_t offset, size_t length); 55 ZErrno fallocate_fill_hole_syscall(size_t offset, size_t length); 56 ZErrno fallocate_fill_hole(size_t offset, size_t length); 57 ZErrno fallocate_punch_hole(size_t offset, size_t length); 58 ZErrno split_and_fallocate(bool punch_hole, size_t offset, size_t length); 59 ZErrno fallocate(bool punch_hole, size_t offset, size_t length); 60 61 bool commit_inner(size_t offset, size_t length); 62 63 public: 64 ZBackingFile(); 65 66 bool is_initialized() const; 67 68 void warn_commit_limits(size_t max) const; 69 70 size_t size() const; 71 72 size_t commit(size_t offset, size_t length); 73 size_t uncommit(size_t offset, size_t length); 74 75 void map(uintptr_t addr, size_t size, uintptr_t offset) const; 76 void unmap(uintptr_t addr, size_t size) const; 77 }; 78 79 #endif // OS_LINUX_GC_Z_ZBACKINGFILE_LINUX_HPP