[PATCH v4 2/2] Used posix_fallocate in place of ftruncate + added related test

[Stéphane Bacri]

From: Stéphane Bacri

---
 dlls/ntdll/tests/file.c | 25 +++++++++++++++++++++++++
 dlls/ntdll/unix/file.c  | 12 ++++++++++--
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/tests/file.c b/dlls/ntdll/tests/file.c
index 8465ad4543a..553fc1eb160 100644
--- a/dlls/ntdll/tests/file.c
+++ b/dlls/ntdll/tests/file.c
@@ -1334,6 +1334,30 @@ static void test_file_io_completion(void)
     pNtClose( h );
 }

+static void test_file_setFileAllocationInformation(void) {
+    FILE_ALLOCATION_INFORMATION fas;
+    BY_HANDLE_FILE_INFORMATION info;
+    IO_STATUS_BLOCK io;
+    HANDLE handle;
+    int res;
+
+    if( !(handle = create_temp_file(0)) ) return;
+
+    memset( &fas, 0, sizeof(fas) );
+    fas.AllocationSize.QuadPart = 1024 * 1024;
+    res = pNtSetInformationFile( handle, &io, &fas, sizeof fas, FileAllocationInformation );
+
+    ok ( res == STATUS_SUCCESS, "file allocation failed, NtSetInformationFile returned %x\n", res );
+    ok ( io.Status == STATUS_SUCCESS, "file allocation failed, io.Status is %lx\n", io.Status );
+
+    memset( &info, 0x22, sizeof(info) );
+    res = GetFileInformationByHandle( handle, &info );
+    ok( res, "GetFileInformationByHandle failed\n" );
+    ok( info.nFileSizeLow == fas.AllocationSize.QuadPart, "incorrect file size after allocation\n" );
+
+    CloseHandle( handle );
+}
+
 static void test_file_full_size_information(void)
 {
     IO_STATUS_BLOCK io;
@@ -6114,6 +6138,7 @@ START_TEST(file)
     test_file_access_information();
     test_file_attribute_tag_information();
     test_file_stat_information();
+    test_file_setFileAllocationInformation();
     test_dotfile_file_attributes();
     test_file_mode();
     test_file_readonly_access();
diff --git a/dlls/ntdll/unix/file.c b/dlls/ntdll/unix/file.c
index af3052b92e3..177e343a311 100644
--- a/dlls/ntdll/unix/file.c
+++ b/dlls/ntdll/unix/file.c
@@ -4672,12 +4672,20 @@ NTSTATUS WINAPI NtSetInformationFile( HANDLE handle, IO_STATUS_BLOCK *io,
         if (len >= sizeof(FILE_ALLOCATION_INFORMATION))
         {
             const FILE_ALLOCATION_INFORMATION *info = ptr;
+            int err;

if ((status = server_get_unix_fd( handle, 0, &fd, &needs_close, NULL, NULL )))
                 return io->Status = status;

-            if (ftruncate(fd, (off_t)info->AllocationSize.QuadPart) == -1)
-                status = errno_to_status( errno );
+#ifdef HAVE_POSIX_FALLOCATE
+            	if ((err = posix_fallocate( fd, 0, (off_t)info->AllocationSize.QuadPart )) != 0)
+                {
+                    if (err == EOPNOTSUPP) WARN( "posix_fallocate not supported on this filesystem\n" );
+                    else status = errno_to_status( err );
+                }
+#else
+                WARN( "setting file allocation information not supported\n" );
+#endif

if (needs_close) close( fd );
         }