[PATCH 07/29] xfs: add fs-verity ro-compat flag

Darrick J. Wong
2024-03-30T00:37:54Z

From: Andrey Albershteyn <aalbersh@redhat.com>

To mark inodes with fs-verity enabled 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>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
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 86a4c51493e7c..1532d37fd1029 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -387,6 +387,7 @@ 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 747d28477b258..39b5083745d0e 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -167,6 +167,8 @@ 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 f89632e0de006..08ec154eb0e98 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -313,6 +313,7 @@ typedef struct xfs_mount {
#define XFS_FEAT_NREXT64 (1ULL << 26) /* large extent counters */
#define XFS_FEAT_METADIR (1ULL << 27) /* metadata directory tree */
#define XFS_FEAT_RTGROUPS (1ULL << 28) /* realtime groups */
+#define XFS_FEAT_VERITY (1ULL << 29) /* fs-verity */

/* Mount features */
#define XFS_FEAT_ADD_LOG_FEAT (1ULL << 47) /* can add log incompat features */
@@ -379,6 +380,7 @@ __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
__XFS_HAS_FEAT(large_extent_counts, NREXT64)
__XFS_HAS_FEAT(metadir, METADIR)
__XFS_HAS_FEAT(rtgroups, RTGROUPS)
+__XFS_HAS_FEAT(verity, VERITY)

bool xfs_can_add_incompat_log_features(struct xfs_mount *mp, bool want_audit);