Am 16.12.2010 19:36, schrieb Christoph Hellwig:
> Add support to discard blocks in a raw image residing on an XFS filesystem
> by calling the XFS_IOC_UNRESVSP64 ioctl to punch holes. Support for other
> hole punching mechanisms can be added when they become available.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
>
> Index: qemu/block/raw-posix.c
> ===================================================================
> --- qemu.orig/block/raw-posix.c 2010-12-15 10:05:37.000000000 +0100
> +++ qemu/block/raw-posix.c 2010-12-16 17:40:47.617253460 +0100
> @@ -69,6 +69,10 @@
> #include <sys/diskslice.h>
> #endif
>
> +#ifdef CONFIG_XFS
> +#include <xfs/xfs.h>
> +#endif
> +
> //#define DEBUG_FLOPPY
>
> //#define DEBUG_BLOCK
> @@ -120,6 +124,9 @@ typedef struct BDRVRawState {
> #endif
> uint8_t *aligned_buf;
> unsigned aligned_buf_size;
> +#ifdef CONFIG_XFS
> + bool is_xfs : 1;
> +#endif
> } BDRVRawState;
>
> static int fd_open(BlockDriverState *bs);
> @@ -196,6 +203,12 @@ static int raw_open_common(BlockDriverSt
> #endif
> }
>
> +#ifdef CONFIG_XFS
> + if (platform_test_xfs_fd(s->fd)) {
> + s->is_xfs = 1;
> + }
> +#endif
> +
> return 0;
>
> out_free_buf:
> @@ -740,6 +753,36 @@ static int raw_flush(BlockDriverState *b
> return qemu_fdatasync(s->fd);
> }
>
> +#ifdef CONFIG_XFS
> +static int xfs_discard(BDRVRawState *s, int64_t sector_num, int nb_sectors)
> +{
> + struct xfs_flock64 fl;
> +
> + memset(&fl, 0, sizeof(fl));
> + fl.l_whence = SEEK_SET;
> + fl.l_start = sector_num << 9;
> + fl.l_len = (int64_t)nb_sectors << 9;
> +
> + if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
> + printf("cannot punch hole (%s)\n", strerror(errno));
Debugging leftover? Block drivers shouldn't print anything to stdout.
> + return -errno;
> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static int raw_discard(BlockDriverState *bs, int64_t sector_num, int
> nb_sectors)
> +{
> +#ifdef CONFIG_XFS
> + BDRVRawState *s = bs->opaque;
> +
> + if (s->is_xfs)
> + return xfs_discard(s, sector_num, nb_sectors);
Missing braces.
I have already applied patch 1 and 2 to the block branch, so sending a
v5 for this one is enough.
Kevin
