Re: [Qemu-devel] r6677 broke access to physical FDD on Win32

[Anthony Liguori]

Robert Riebisch wrote:
> Anthony Liguori wrote:
>
>   
> > Looks like the code is doing the right thing.  Someone running windows 
> > is going to have to debug this because a: should be transformed to 
> > \\.\a: as far as I can read the code.
> >     
>
> Japheth posted the following proposal to my forum, where I advertize
> running DOS in QEMU
> (<http://www.bttr-software.de/forum/forum_entry.php?id=6249>):
>
> I didn't test so far, because I was AFK for this weekend.
>   

Needs a signed-off-by.

Regards,

Anthony Liguori

> --- block-raw-win32.co  Wed Mar  4 22:54:44 2009
> +++ block-raw-win32.c   Sat Mar 21 05:51:34 2009
> @@ -32,6 +32,7 @@
>  #define FTYPE_FILE 0
>  #define FTYPE_CD     1
>  #define FTYPE_HARDDISK 2
> +#define FTYPE_DISK 3
>
>  typedef struct BDRVRawState {
>      HANDLE hfile;
> @@ -305,6 +306,7 @@
>          if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
>              return -EIO;
>          break;
> +    case FTYPE_DISK:
>      case FTYPE_CD:
>          if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total,
> &total_free))
>              return -EIO;
> @@ -402,7 +404,7 @@
>          if (type == DRIVE_CDROM)
>              return FTYPE_CD;
>          else
> -            return FTYPE_FILE;
> +            return FTYPE_DISK;
>      } else {
>          return FTYPE_FILE;
>      }
> @@ -411,7 +413,7 @@
>  static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
>  {
>      BDRVRawState *s = bs->opaque;
> -    int access_flags, create_flags;
> +    int access_flags, create_flags, share_flags;
>      DWORD overlapped;
>      char device_name[64];
>
> @@ -429,6 +431,10 @@
>          }
>      }
>      s->type = find_device_type(bs, filename);
> +    if (s->type == FTYPE_DISK)
> +        share_flags = FILE_SHARE_READ | FILE_SHARE_WRITE;
> +    else
> +        share_flags = FILE_SHARE_READ;
>
>      if ((flags & BDRV_O_ACCESS) == O_RDWR) {
>          access_flags = GENERIC_READ | GENERIC_WRITE;
> @@ -447,7 +453,7 @@
>      else if (!(flags & BDRV_O_CACHE_WB))
>          overlapped |= FILE_FLAG_WRITE_THROUGH;
>      s->hfile = CreateFile(filename, access_flags,
> -                          FILE_SHARE_READ, NULL,
> +                          share_flags, NULL,
>                            create_flags, overlapped, NULL);
>      if (s->hfile == INVALID_HANDLE_VALUE) {
>          int err = GetLastError();
>
> Robert Riebisch
>