diff options
Diffstat (limited to 'winsup/cygwin/fhandler_disk_file.cc')
| -rw-r--r-- | winsup/cygwin/fhandler_disk_file.cc | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc index 8deb7fb16..27e621708 100644 --- a/winsup/cygwin/fhandler_disk_file.cc +++ b/winsup/cygwin/fhandler_disk_file.cc @@ -26,6 +26,7 @@ details. */ #include "pinfo.h" #include <assert.h> #include <ctype.h> +#include <winioctl.h> #define _COMPILING_NEWLIB #include <dirent.h> @@ -386,6 +387,19 @@ fhandler_disk_file::open (path_conv *real_path, int flags, mode_t mode) return 0; } + /* Set newly created and truncated files as sparse files. */ + if ((real_path->fs_flags () & FILE_SUPPORTS_SPARSE_FILES) + && (get_access () & GENERIC_WRITE) == GENERIC_WRITE + && (get_flags () & (O_CREAT | O_TRUNC))) + { + DWORD dw; + HANDLE h = get_handle (); + BOOL r = DeviceIoControl (h , FSCTL_SET_SPARSE, NULL, 0, NULL, 0, &dw, + NULL); + syscall_printf ("%d = DeviceIoControl(0x%x, FSCTL_SET_SPARSE, NULL, 0, " + "NULL, 0, &dw, NULL)", r, h); + } + set_symlink_p (real_path->issymlink ()); set_execable_p (real_path->exec_state ()); set_socket_p (real_path->issocket ()); |