Re: [RFC v3 01/11] btrfs: add raid stripe tree definitions

[Josef Bacik <josef@toxicpanda.com>]

On Mon, Oct 17, 2022 at 04:55:19AM -0700, Johannes Thumshirn wrote:
> Add definitions for the raid stripe tree. This tree will hold information
> about the on-disk layout of the stripes in a RAID set.
> 
> Each stripe extent has a 1:1 relationship with an on-disk extent item and
> is doing the logical to per-drive physical address translation for the
> extent item in question.
> 
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> ---
>  fs/btrfs/ctree.h                | 29 +++++++++++++++++++++++++++++
>  include/uapi/linux/btrfs_tree.h | 20 ++++++++++++++++++--
>  2 files changed, 47 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index 87bb4218276b..80ead27299dc 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -1992,6 +1992,35 @@ BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
>  BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
>  BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
>  
> +BTRFS_SETGET_FUNCS(stripe_extent_devid, struct btrfs_stripe_extent, devid, 64);
> +BTRFS_SETGET_FUNCS(stripe_extent_physical, struct btrfs_stripe_extent, physical, 64);
> +BTRFS_SETGET_STACK_FUNCS(stack_stripe_extent_devid, struct btrfs_stripe_extent, devid, 64);
> +BTRFS_SETGET_STACK_FUNCS(stack_stripe_extent_physical, struct btrfs_stripe_extent, physical, 64);
> +
> +static inline struct btrfs_stripe_extent *btrfs_stripe_extent_nr(
> +					 struct btrfs_dp_stripe *dps, int nr)
> +{
> +	unsigned long offset = (unsigned long)dps;
> +
> +	offset += offsetof(struct btrfs_dp_stripe, extents);
> +	offset += nr * sizeof(struct btrfs_stripe_extent);
> +	return (struct btrfs_stripe_extent *)offset;
> +}
> +
> +static inline u64 btrfs_stripe_extent_devid_nr(const struct extent_buffer *eb,
> +					       struct btrfs_dp_stripe *dps,
> +					       int nr)
> +{
> +	return btrfs_stripe_extent_devid(eb, btrfs_stripe_extent_nr(dps, nr));
> +}
> +
> +static inline u64 btrfs_stripe_extent_physical_nr(const struct extent_buffer *eb,
> +						  struct btrfs_dp_stripe *dps,
> +						  int nr)
> +{
> +	return btrfs_stripe_extent_physical(eb, btrfs_stripe_extent_nr(dps, nr));
> +}
> +
>  /* struct btrfs_dev_extent */
>  BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
>  		   chunk_tree, 64);
> diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
> index 5f32a2a495dc..047e1d0b2ff6 100644
> --- a/include/uapi/linux/btrfs_tree.h
> +++ b/include/uapi/linux/btrfs_tree.h
> @@ -4,9 +4,8 @@
>  
>  #include <linux/btrfs.h>
>  #include <linux/types.h>
> -#ifdef __KERNEL__
>  #include <linux/stddef.h>
> -#else
> +#ifndef __KERNEL__
>  #include <stddef.h>
>  #endif
> 

Gotta act like I did something, this is unrelated and should probably be it's
own thing separate from the raid stripe tree.  Thanks,

Josef