* autoload.cc (NtSetInformationFile): Define.
* cygwin.din: Export posix_fadvise and posix_fallocate. * fhandler.cc (fhandler_base::fadvise): New method. (fhandler_base::ftruncate): Add allow_truncate parameter. * fhandler.h (class fhandler_base): Add fadvise method. Accomodate new parameter to ftruncate. (class fhandler_pipe): Add fadvise and ftruncate methods. (class fhandler_disk_file): Add fadvise method. Accomodate new parameter to ftruncate. * fhandler_disk_file.cc (fhandler_disk_file::fadvise): New method. (fhandler_disk_file::ftruncate): Accomodate new allow_truncate parameter. Set EOF using NtSetInformationFile on NT. * ntdll.h (struct _FILE_END_OF_FILE_INFORMATION): Define. (NtSetInformationFile): Declare. * pipe.cc (fhandler_pipe::fadvise): New method. (fhandler_pipe::ftruncate): Ditto. * syscalls.cc (posix_fadvise): New function. (posix_fallocate): Ditto. (ftruncate64): Accomodate second parameter to fhandler's ftruncate method. * include/fcntl.h: Add POSIX_FADV_* flags. Add declarations of posix_fadvise and posix_fallocate. * include/cygwin/version.h: Bump API minor number.
This commit is contained in:
Corinna Vinschen
@ -762,11 +762,57 @@ fhandler_disk_file::facl (int cmd, int nentries, __aclent32_t *aclbufp)
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}
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int
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fhandler_disk_file::ftruncate (_off64_t length)
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fhandler_disk_file::fadvise (_off64_t offset, _off64_t length, int advice)
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{
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int res = -1, res_bug = 0;
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if (advice < POSIX_FADV_NORMAL || advice > POSIX_FADV_NOREUSE)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (length < 0 || !get_output_handle ())
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if (!wincap.is_winnt ())
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return 0;
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/* Windows only supports advice flags for the whole file. We're using
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a simplified test here so that we don't have to ask for the actual
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file size. Length == 0 means all bytes starting at offset anyway.
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So we only actually follow the advice, if it's given for offset == 0. */
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if (offset != 0)
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return 0;
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/* We only support normal and sequential mode for now. Everything which
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is not POSIX_FADV_SEQUENTIAL is treated like POSIX_FADV_NORMAL. */
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if (advice != POSIX_FADV_SEQUENTIAL)
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advice = POSIX_FADV_NORMAL;
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IO_STATUS_BLOCK io;
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FILE_MODE_INFORMATION fmi;
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NTSTATUS status = NtQueryInformationFile (get_handle (), &io,
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&fmi, sizeof fmi,
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FileModeInformation);
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if (!NT_SUCCESS (status))
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__seterrno_from_nt_status (status);
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else
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{
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fmi.Mode &= ~FILE_SEQUENTIAL_ONLY;
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if (advice == POSIX_FADV_SEQUENTIAL)
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fmi.Mode |= FILE_SEQUENTIAL_ONLY;
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status = NtSetInformationFile (get_handle (), &io, &fmi, sizeof fmi,
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FileModeInformation);
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if (NT_SUCCESS (status))
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return 0;
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__seterrno_from_nt_status (status);
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}
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return -1;
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}
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int
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fhandler_disk_file::ftruncate (_off64_t length, bool allow_truncate)
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{
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int res = -1;
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if (length < 0 || !get_handle ())
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set_errno (EINVAL);
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else if (pc.isdir ())
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set_errno (EISDIR);
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@ -774,33 +820,58 @@ fhandler_disk_file::ftruncate (_off64_t length)
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set_errno (EBADF);
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else
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{
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_off64_t prev_loc = lseek (0, SEEK_CUR);
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if (lseek (length, SEEK_SET) >= 0)
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{
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if (get_fs_flags (FILE_SUPPORTS_SPARSE_FILES))
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_off64_t actual_length;
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DWORD size_high = 0;
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actual_length = GetFileSize (get_handle (), &size_high);
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actual_length += ((_off64_t) size_high) << 32;
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/* If called through posix_fallocate, silently succeed if length
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is less than the file's actual length. */
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if (!allow_truncate && length < actual_length)
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return 0;
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if (wincap.is_winnt ())
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{
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NTSTATUS status;
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IO_STATUS_BLOCK io;
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FILE_END_OF_FILE_INFORMATION feofi;
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feofi.EndOfFile.QuadPart = length;
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/* Create sparse files only when called through ftruncate, not when
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called through posix_fallocate. */
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if (allow_truncate
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&& get_fs_flags (FILE_SUPPORTS_SPARSE_FILES)
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&& length >= actual_length + (128 * 1024))
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{
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_off64_t actual_length;
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DWORD size_high = 0;
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actual_length = GetFileSize (get_output_handle (), &size_high);
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actual_length += ((_off64_t) size_high) << 32;
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if (length >= actual_length + (128 * 1024))
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{
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DWORD dw;
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BOOL r = DeviceIoControl (get_output_handle (),
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FSCTL_SET_SPARSE, NULL, 0, NULL,
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0, &dw, NULL);
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syscall_printf ("%d = DeviceIoControl(%p, FSCTL_SET_SPARSE)",
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r, get_output_handle ());
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}
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DWORD dw;
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BOOL r = DeviceIoControl (get_handle (),
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FSCTL_SET_SPARSE, NULL, 0, NULL,
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0, &dw, NULL);
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syscall_printf ("%d = DeviceIoControl(%p, FSCTL_SET_SPARSE)",
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r, get_handle ());
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}
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else if (wincap.has_lseek_bug ())
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res_bug = write (&res, 0);
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if (!SetEndOfFile (get_output_handle ()))
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__seterrno ();
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status = NtSetInformationFile (get_handle (), &io,
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&feofi, sizeof feofi,
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FileEndOfFileInformation);
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if (!NT_SUCCESS (status))
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__seterrno_from_nt_status (status);
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else
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res = res_bug;
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/* restore original file pointer location */
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lseek (prev_loc, SEEK_SET);
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res = 0;
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}
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else
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{
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_off64_t prev_loc = lseek (0, SEEK_CUR);
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if (lseek (length, SEEK_SET) >= 0)
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{
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int res_bug = write (&res, 0);
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if (!SetEndOfFile (get_handle ()))
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__seterrno ();
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else
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res = res_bug;
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/* restore original file pointer location */
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lseek (prev_loc, SEEK_SET);
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}
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}
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}
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return res;
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