[PATCH v4 4/4] ntdll: Implemented FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE

[Joel Holdsworth]

From: Joel Holdsworth

Both the Msys2 and Cygwin runtimes make use of FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE in their
implementations of the unlink() system call. This enables these routines to delete a read-only file
without first modifying the attributes.

https://github.com/msys2/msys2-runtime/blob/msys2-3.4.3/winsup/cygwin/syscal...
https://www.cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/sysca...

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50771
Signed-off-by: Joel Holdsworth 
---
 dlls/ntdll/tests/file.c | 2 --
 dlls/ntdll/unix/file.c  | 2 --
 server/fd.c             | 3 ++-
 3 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/dlls/ntdll/tests/file.c b/dlls/ntdll/tests/file.c
index 96d6ab0a88a..34c00a94fee 100644
--- a/dlls/ntdll/tests/file.c
+++ b/dlls/ntdll/tests/file.c
@@ -3098,13 +3098,11 @@ static void test_file_disposition_information(void)
     ok( handle != INVALID_HANDLE_VALUE, "failed to create temp file\n" );
     fdie.Flags = FILE_DISPOSITION_DELETE | FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE;
     res = pNtSetInformationFile( handle, &io, &fdie, sizeof fdie, FileDispositionInformationEx );
-    todo_wine
     ok( res == STATUS_INVALID_INFO_CLASS || res == STATUS_SUCCESS,
         "unexpected FileDispositionInformation result (expected STATUS_SUCCES or SSTATUS_INVALID_INFO_CLASS, got %lx)\n", res );
     CloseHandle( handle );
     if ( res == STATUS_SUCCESS ) {
         fileDeleted = GetFileAttributesA( buffer ) == INVALID_FILE_ATTRIBUTES && GetLastError() == ERROR_FILE_NOT_FOUND;
-        todo_wine
         ok( fileDeleted, "File should have been deleted\n" );
     }
     SetFileAttributesA( buffer, FILE_ATTRIBUTE_NORMAL );
diff --git a/dlls/ntdll/unix/file.c b/dlls/ntdll/unix/file.c
index 3e930f1ac2f..8352cd6722b 100644
--- a/dlls/ntdll/unix/file.c
+++ b/dlls/ntdll/unix/file.c
@@ -4773,8 +4773,6 @@ NTSTATUS WINAPI NtSetInformationFile( HANDLE handle, IO_STATUS_BLOCK *io,
                 FIXME( "FILE_DISPOSITION_FORCE_IMAGE_SECTION_CHECK not supported\n" );
             if (info->Flags & FILE_DISPOSITION_ON_CLOSE)
                 FIXME( "FILE_DISPOSITION_ON_CLOSE not supported\n" );
-            if (info->Flags & FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE)
-                FIXME( "FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE not supported\n" );

SERVER_START_REQ( set_fd_disp_info )
             {
diff --git a/server/fd.c b/server/fd.c
index 9388d36dcfd..942585b06ae 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -2499,7 +2499,8 @@ static void set_fd_disposition( struct fd *fd, unsigned int flags )
         }
         if (S_ISREG( st.st_mode ))  /* can't unlink files we don't have permission to write */
         {
-            if (!(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)))
+            if (!(flags & FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE) &&
+                !(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)))
             {
                 set_error( STATUS_CANNOT_DELETE );
                 return;