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_CPU_LINUX_AARCH64_GC_Z_ZBACKINGFILE_LINUX_AARCH64_HPP

    25 #define OS_CPU_LINUX_AARCH64_GC_Z_ZBACKINGFILE_LINUX_AARCH64_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   int create_mem_fd(const char* name) const;

    41   int create_file_fd(const char* name) const;

    42   int create_fd(const char* name) const;

    43 

    44   bool is_tmpfs() const;

    45   bool is_hugetlbfs() const;

    46   bool tmpfs_supports_transparent_huge_pages() const;

    47 

    48   ZErrno fallocate_compat_ftruncate(size_t size) const;

    49   ZErrno fallocate_compat_mmap(size_t offset, size_t length, bool reserve_only) const;

    50   ZErrno fallocate_compat_pwrite(size_t offset, size_t length) const;

    51   ZErrno fallocate_fill_hole_compat(size_t offset, size_t length);

    52   ZErrno fallocate_fill_hole_syscall(size_t offset, size_t length);

    53   ZErrno fallocate_fill_hole(size_t offset, size_t length);

    54   ZErrno fallocate_punch_hole(size_t offset, size_t length);

    55   ZErrno split_and_fallocate(bool punch_hole, size_t offset, size_t length);

    56   ZErrno fallocate(bool punch_hole, size_t offset, size_t length);

    57 

    58   bool commit_inner(size_t offset, size_t length);

    59 

    60 public:

    61   ZBackingFile();

    62 

    63   bool is_initialized() const;

    64 

    65   int fd() const;

    66   size_t size() const;

    67   size_t available() const;

    68 

    69   size_t commit(size_t offset, size_t length);

    70   size_t uncommit(size_t offset, size_t length);

    71 };

    72 

    73 #endif // OS_CPU_LINUX_AARCH64_GC_Z_ZBACKINGFILE_LINUX_AARCH64_HPP