InodeFile.cpp 3.4 KB

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  1. /*
  2. * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
  3. * All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions are met:
  7. *
  8. * 1. Redistributions of source code must retain the above copyright notice, this
  9. * list of conditions and the following disclaimer.
  10. *
  11. * 2. Redistributions in binary form must reproduce the above copyright notice,
  12. * this list of conditions and the following disclaimer in the documentation
  13. * and/or other materials provided with the distribution.
  14. *
  15. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  16. * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18. * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  19. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21. * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  22. * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  23. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25. */
  26. #include <Kernel/FileSystem/FileDescription.h>
  27. #include <Kernel/FileSystem/Inode.h>
  28. #include <Kernel/FileSystem/InodeFile.h>
  29. #include <Kernel/FileSystem/VirtualFileSystem.h>
  30. #include <Kernel/Process.h>
  31. InodeFile::InodeFile(NonnullRefPtr<Inode>&& inode)
  32. : m_inode(move(inode))
  33. {
  34. }
  35. InodeFile::~InodeFile()
  36. {
  37. }
  38. ssize_t InodeFile::read(FileDescription& description, u8* buffer, ssize_t count)
  39. {
  40. ssize_t nread = m_inode->read_bytes(description.offset(), count, buffer, &description);
  41. if (nread > 0)
  42. current->did_file_read(nread);
  43. return nread;
  44. }
  45. ssize_t InodeFile::write(FileDescription& description, const u8* data, ssize_t count)
  46. {
  47. ssize_t nwritten = m_inode->write_bytes(description.offset(), count, data, &description);
  48. if (nwritten > 0) {
  49. m_inode->set_mtime(kgettimeofday().tv_sec);
  50. current->did_file_write(nwritten);
  51. }
  52. return nwritten;
  53. }
  54. KResultOr<Region*> InodeFile::mmap(Process& process, FileDescription& description, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot)
  55. {
  56. ASSERT(offset == 0);
  57. // FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
  58. auto* region = process.allocate_file_backed_region(preferred_vaddr, size, inode(), description.absolute_path(), prot);
  59. if (!region)
  60. return KResult(-ENOMEM);
  61. return region;
  62. }
  63. String InodeFile::absolute_path(const FileDescription& description) const
  64. {
  65. ASSERT_NOT_REACHED();
  66. ASSERT(description.custody());
  67. return description.absolute_path();
  68. }
  69. KResult InodeFile::truncate(u64 size)
  70. {
  71. auto truncate_result = m_inode->truncate(size);
  72. if (truncate_result.is_error())
  73. return truncate_result;
  74. int mtime_result = m_inode->set_mtime(kgettimeofday().tv_sec);
  75. if (mtime_result != 0)
  76. return KResult(mtime_result);
  77. return KSuccess;
  78. }
  79. KResult InodeFile::chown(uid_t uid, gid_t gid)
  80. {
  81. return VFS::the().chown(*m_inode, uid, gid);
  82. }
  83. KResult InodeFile::chmod(mode_t mode)
  84. {
  85. return VFS::the().chmod(*m_inode, mode);
  86. }