Re: [PATCH v3 20/28] xfs: add fs-verity ro-compat flag

["Darrick J. Wong" <djwong@kernel.org>]

On Fri, Oct 06, 2023 at 08:49:14PM +0200, Andrey Albershteyn wrote:
> To mark inodes sealed with fs-verity the new XFS_DIFLAG2_VERITY flag
> will be added in further patch. This requires ro-compat flag to let
> older kernels know that fs with fs-verity can not be modified.
> 
> Signed-off-by: Andrey Albershteyn <aalbersh@redhat.com>

LGTM,
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  fs/xfs/libxfs/xfs_format.h | 1 +
>  fs/xfs/libxfs/xfs_sb.c     | 2 ++
>  fs/xfs/xfs_mount.h         | 2 ++
>  3 files changed, 5 insertions(+)
> 
> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> index 371dc07233e0..ef617be2839c 100644
> --- a/fs/xfs/libxfs/xfs_format.h
> +++ b/fs/xfs/libxfs/xfs_format.h
> @@ -353,6 +353,7 @@ xfs_sb_has_compat_feature(
>  #define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)		/* reverse map btree */
>  #define XFS_SB_FEAT_RO_COMPAT_REFLINK  (1 << 2)		/* reflinked files */
>  #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3)		/* inobt block counts */
> +#define XFS_SB_FEAT_RO_COMPAT_VERITY   (1 << 4)		/* fs-verity */
>  #define XFS_SB_FEAT_RO_COMPAT_ALL \
>  		(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
>  		 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
> diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
> index 4191da4fb669..236f3b833fa4 100644
> --- a/fs/xfs/libxfs/xfs_sb.c
> +++ b/fs/xfs/libxfs/xfs_sb.c
> @@ -162,6 +162,8 @@ xfs_sb_version_to_features(
>  		features |= XFS_FEAT_REFLINK;
>  	if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
>  		features |= XFS_FEAT_INOBTCNT;
> +	if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_VERITY)
> +		features |= XFS_FEAT_VERITY;
>  	if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE)
>  		features |= XFS_FEAT_FTYPE;
>  	if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES)
> diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
> index 3d77844b255e..95fba704f60e 100644
> --- a/fs/xfs/xfs_mount.h
> +++ b/fs/xfs/xfs_mount.h
> @@ -288,6 +288,7 @@ typedef struct xfs_mount {
>  #define XFS_FEAT_BIGTIME	(1ULL << 24)	/* large timestamps */
>  #define XFS_FEAT_NEEDSREPAIR	(1ULL << 25)	/* needs xfs_repair */
>  #define XFS_FEAT_NREXT64	(1ULL << 26)	/* large extent counters */
> +#define XFS_FEAT_VERITY		(1ULL << 27)	/* fs-verity */
>  
>  /* Mount features */
>  #define XFS_FEAT_NOATTR2	(1ULL << 48)	/* disable attr2 creation */
> @@ -351,6 +352,7 @@ __XFS_HAS_FEAT(inobtcounts, INOBTCNT)
>  __XFS_HAS_FEAT(bigtime, BIGTIME)
>  __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
>  __XFS_HAS_FEAT(large_extent_counts, NREXT64)
> +__XFS_HAS_FEAT(verity, VERITY)
>  
>  /*
>   * Mount features
> -- 
> 2.40.1
>