Is there a reason why this patch hasn't been reviewed yet?
http://patchwork.ozlabs.org/patch/500498/
> Mac OS X can be picky when it comes to allowing the user to use physical
> devices
> in QEMU. Most mounted volumes appear to be off limits to QEMU. If an issue is
> detected, a message is displayed showing the user how to unmount a volume.
>
> Signed-off-by: John Arbuckle <programmingk...@gmail.com>
>
> ---
> Removed changes to GetBSDPath() to a separate patch.
> This patch now depends on the GetBSDPath patch.
>
> block/raw-posix.c | 90 +++++++++++++++++++++++++++++++++++++---------------
> 1 files changed, 64 insertions(+), 26 deletions(-)
>
> diff --git a/block/raw-posix.c b/block/raw-posix.c
> index 67d1d48..a41006f 100644
> --- a/block/raw-posix.c
> +++ b/block/raw-posix.c
> @@ -42,9 +42,8 @@
> #include <IOKit/storage/IOMediaBSDClient.h>
> #include <IOKit/storage/IOMedia.h>
> #include <IOKit/storage/IOCDMedia.h>
> -//#include <IOKit/storage/IOCDTypes.h>
> #include <CoreFoundation/CoreFoundation.h>
> -#endif
> +#endif /* (__APPLE__) && (__MACH__) */
>
> #ifdef __sun__
> #define _POSIX_PTHREAD_SEMANTICS 1
> @@ -1972,7 +1971,7 @@ BlockDriver bdrv_file = {
> /* host device */
>
> #if defined(__APPLE__) && defined(__MACH__)
> -static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
> +static kern_return_t FindEjectableCDMedia(io_iterator_t *mediaIterator);
> static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
> CFIndex maxPathSize, int flags);
> kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
> @@ -2030,7 +2029,34 @@ kern_return_t GetBSDPath(io_iterator_t mediaIterator,
> char *bsdPath,
> return kernResult;
> }
>
> -#endif
> +/* Sets up a real cdrom for use in QEMU */
> +static bool setupCDROM(char *bsdPath)
> +{
> + int index, numOfTestPartitions = 2, fd;
> + char testPartition[MAXPATHLEN];
> + bool partitionFound = false;
> +
> + /* look for a working partition */
> + for (index = 0; index < numOfTestPartitions; index++) {
> + snprintf(testPartition, sizeof(testPartition), "%ss%d", bsdPath,
> index);
> + fd = qemu_open(testPartition, O_RDONLY | O_BINARY | O_LARGEFILE);
> + if (fd >= 0) {
> + partitionFound = true;
> + qemu_close(fd);
> + break;
> + }
> + }
> +
> + /* if a working partition on the device was not found */
> + if (partitionFound == false) {
> + printf("Error: Failed to find a working partition on disc!\n");
> + } else {
> + DPRINTF("Using %s as optical disc\n", testPartition);
> + pstrcpy(bsdPath, MAXPATHLEN, testPartition);
> + }
> + return partitionFound;
> +}
> +#endif /* defined(__APPLE__) && defined(__MACH__) */
>
> static int hdev_probe_device(const char *filename)
> {
> @@ -2118,34 +2144,32 @@ static int hdev_open(BlockDriverState *bs, QDict
> *options, int flags,
> BDRVRawState *s = bs->opaque;
> Error *local_err = NULL;
> int ret;
> + bool cdromOK = true;
>
> #if defined(__APPLE__) && defined(__MACH__)
> const char *filename = qdict_get_str(options, "filename");
>
> - if (strstart(filename, "/dev/cdrom", NULL)) {
> - kern_return_t kernResult;
> - io_iterator_t mediaIterator;
> - char bsdPath[ MAXPATHLEN ];
> - int fd;
> -
> - kernResult = FindEjectableCDMedia( &mediaIterator );
> - kernResult = GetBSDPath(mediaIterator, bsdPath, sizeof(bsdPath),
> -
> flags);
> - if ( bsdPath[ 0 ] != '\0' ) {
> - strcat(bsdPath,"s0");
> - /* some CDs don't have a partition 0 */
> - fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
> - if (fd < 0) {
> - bsdPath[strlen(bsdPath)-1] = '1';
> + /* If using a physical device */
> + if (strstart(filename, "/dev/", NULL)) {
> + char bsdPath[MAXPATHLEN];
> +
> + /* If the physical device is a cdrom */
> + if (strcmp(filename, "/dev/cdrom") == 0) {
> + io_iterator_t mediaIterator;
> + FindEjectableCDMedia(&mediaIterator);
> + GetBSDPath(mediaIterator, bsdPath, sizeof(bsdPath), flags);
> + if (bsdPath[0] == '\0') {
> + printf("Error: failed to obtain bsd path for optical
> drive!\n");
> } else {
> - qemu_close(fd);
> + cdromOK = setupCDROM(bsdPath);
> + filename = bsdPath;
> }
> - filename = bsdPath;
> - qdict_put(options, "filename", qstring_from_str(filename));
> - }
>
> - if ( mediaIterator )
> - IOObjectRelease( mediaIterator );
> + if (mediaIterator) {
> + IOObjectRelease(mediaIterator);
> + }
> + }
> + qdict_put(options, "filename", qstring_from_str(filename));
> }
> #endif
>
> @@ -2156,7 +2180,21 @@ static int hdev_open(BlockDriverState *bs, QDict
> *options, int flags,
> if (local_err) {
> error_propagate(errp, local_err);
> }
> - return ret;
> + }
> +
> +#if defined(__APPLE__) && defined(__MACH__)
> + /* if a physical device experienced an error while being opened */
> + if (strncmp(filename, "/dev/", 5) == 0 && (cdromOK == false || ret !=
> 0)) {
> + printf("If device %s is mounted on the desktop, unmount it"
> + " first before using it in QEMU.\n", filename);
> + printf("Command to unmount device: diskutil unmountDisk %s\n",
> +
> filename);
> + printf("Command to mount device: diskutil mountDisk %s\n", filename);
> + }
> +#endif /* defined(__APPLE__) && defined(__MACH__) */
> +
> + if (ret < 0) {
> + return ret;
> }
>
> /* Since this does ioctl the device must be already opened */
> --
> 1.7.5.4
>
