[PATCH 09/10] xfs: validate feature support when recovering rmap/refcount/bmap intents

Darrick J. Wong
2020-12-01T03:39:21Z

From: Darrick J. Wong <darrick.wong@oracle.com>

The bmap, rmap, and refcount log intent items were added to support the
rmap and reflink features. Because these features come with changes to
the ondisk format, the log items aren't tied to a log incompat flags.

However, the log recovery routines don't actually check for those
feature flags. The kernel has no business replayng an intent item for a
feature that isn't enabled, so check that as part of recovered log item
validation. (Note that kernels pre-dating rmap and reflink will fail
the mount on the unknown log item type code.)

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/xfs_bmap_item.c | 4 ++++
fs/xfs/xfs_refcount_item.c | 3 +++
fs/xfs/xfs_rmap_item.c | 3 +++
3 files changed, 10 insertions(+)

diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
index 19f89a6b65a1..f36005c999b2 100644
--- a/fs/xfs/xfs_bmap_item.c
+++ b/fs/xfs/xfs_bmap_item.c
@@ -426,6 +426,10 @@ xfs_bui_validate(
struct xfs_map_extent *bmap;
xfs_fsblock_t end;

+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb) &&
+ !xfs_sb_version_hasreflink(&mp->m_sb))
+ return false;
+
/* Only one mapping operation per BUI... */
if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS)
return false;
diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c
index 20e5c22bb754..2017108b37a1 100644
--- a/fs/xfs/xfs_refcount_item.c
+++ b/fs/xfs/xfs_refcount_item.c
@@ -425,6 +425,9 @@ xfs_cui_validate_phys(
{
xfs_fsblock_t end;

+ if (!xfs_sb_version_hasreflink(&mp->m_sb))
+ return false;
+
if (refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS)
return false;

diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c
index 2779cbee8fa8..13871882ffb6 100644
--- a/fs/xfs/xfs_rmap_item.c
+++ b/fs/xfs/xfs_rmap_item.c
@@ -468,6 +468,9 @@ xfs_rui_validate_map(
{
xfs_fsblock_t end;

+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return false;
+
if (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS)
return false;