On Tue, Jan 4, 2011 at 2:33 PM, Juan Quintela <quint...@redhat.com> wrote:
> Linux allows to invalidate block devices. This is needed for the incoming
> migration part.
>
> Signed-off-by: Juan Quintela <quint...@redhat.com>
> ---
> block.h | 2 ++
> block/raw-posix.c | 24 ++++++++++++++++++++++++
> blockdev.c | 9 +++++----
> 3 files changed, 31 insertions(+), 4 deletions(-)
>
> diff --git a/block.h b/block.h
> index f923add..5ac96a5 100644
> --- a/block.h
> +++ b/block.h
> @@ -34,6 +34,8 @@ typedef struct QEMUSnapshotInfo {
> #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread
> pool */
> #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
> #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
> +#define BDRV_O_INVALIDATE 0x0400 /* invalidate buffer cache for this device.
> + re-read things from server */
>
> #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB |
> BDRV_O_NO_FLUSH)
>
> diff --git a/block/raw-posix.c b/block/raw-posix.c
> index 6b72470..9439cf1 100644
> --- a/block/raw-posix.c
> +++ b/block/raw-posix.c
> @@ -51,6 +51,7 @@
> #include <sys/param.h>
> #include <linux/cdrom.h>
> #include <linux/fd.h>
> +#include <linux/fs.h>
> #endif
> #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
> #include <signal.h>
> @@ -168,6 +169,29 @@ static int raw_open_common(BlockDriverState *bs, const
> char *filename,
> s->fd = fd;
> s->aligned_buf = NULL;
>
> +#ifdef __linux__
> + if ((bdrv_flags & BDRV_O_INVALIDATE)) {
> + struct stat buf;
> + int res;
> +
> + res = fstat(fd, &buf);
> +
> + if (res < 0) {
> + return -errno;
> + }
> +
> + if (S_ISBLK(buf.st_mode)) {
> + printf("we are in a block device: %s\n", filename);
Leftover debugging?
