> Apparently xfs_repair running on a v5 filesystem doesn't check the
> compat, rocompat, or incompat feature flags for bits that it doesn't
> know about, which means that old xfs_repairs can wreak havoc. So,
> strengthen the checks to prevent repair from "repairing" anything it
> doesn't understand.
>
> v2: Move the complaint code after the version number check, and print
> the actual feature bits that we don't recognize.
>
> Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
> ---
> repair/versions.c | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/repair/versions.c b/repair/versions.c
> index c1dff72..dbe41a4 100644
> --- a/repair/versions.c
> +++ b/repair/versions.c
> @@ -175,6 +175,39 @@ _("WARNING: you have disallowed
superblock-feature-bits-allowed\n"
> }
> }
>
> + /* Look for V5 feature flags we don't know about */
> + if (XFS_SB_VERSION_NUM(sb) >= XFS_SB_VERSION_5) {
> + if (xfs_sb_has_ro_compat_feature(sb,
> + XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
> + do_warn(
> +_("Superblock has unknown read-only compatible features (0x%x)
enabled.\n"
> +"Using a more recent xfs_repair is recommended.\n"),
> + sb->sb_features_ro_compat &
> + XFS_SB_FEAT_RO_COMPAT_UNKNOWN);
> + issue_warning = 1;
> + }
> + if (xfs_sb_has_incompat_feature(sb,
> + XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
> + do_warn(
> +_("Superblock has unknown read-only compatible features (0x%x)
enabled.\n"
> +"Using a more recent xfs_repair is recommended.\n"),
> + sb->sb_features_ro_compat &
> + XFS_SB_FEAT_RO_COMPAT_UNKNOWN);
Copy/paste error, do you mean incompat?
> + issue_warning = 1;
> + }
> + if (xfs_sb_has_compat_feature(sb,
> + XFS_SB_FEAT_COMPAT_UNKNOWN)) {
> + do_warn(
> +_("Superblock has unknown compatible features (0x%x) enabled.\n"
> +"Using a more recent xfs_repair is recommended.\n"),
> + sb->sb_features_ro_compat &
> + XFS_SB_FEAT_RO_COMPAT_UNKNOWN);
compat here?
> + issue_warning = 1;
> + }
> + if (issue_warning)
> + return 1;
> + }
> +
> if (xfs_sb_version_hasattr(sb)) {
> if (!fs_attributes_allowed) {
> if (!no_modify) {
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