On Mon, Dec 30, 2013 at 04:12:55PM +0800, Liu Bo wrote:
> --- a/ctree.h
> +++ b/ctree.h
> @@ -470,6 +470,7 @@ struct btrfs_super_block {
> #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
> #define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
> #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
> +#define BTRFS_FEATURE_INCOMPAT_DEDUP (1ULL << 9)
FYI, this incompat bit is taken by Josef's NO_HOLE feature, now heading
to next merge window, so I've used 10 for dedup in integration branch.
> --- a/ioctl.h
> +++ b/ioctl.h
> @@ -430,6 +430,15 @@ struct btrfs_ioctl_get_dev_stats {
> __u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
> };
>
> +/* deduplication control ioctl modes */
> +#define BTRFS_DEDUP_CTL_ENABLE 1
> +#define BTRFS_DEDUP_CTL_DISABLE 2
> +#define BTRFS_DEDUP_CTL_SET_BS 3
> +struct btrfs_ioctl_dedup_args {
> + __u64 cmd;
> + __u64 bs;
I've spotted that you did not reserve any space for future extensions of
the ioctl, especially the in-band dedup can be quite heavy, I think
we'll want some tunables in the future.
> +};
> +
> /* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
> #define BTRFS_QUOTA_CTL_ENABLE 1
> #define BTRFS_QUOTA_CTL_DISABLE 2
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