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

Darrick J. Wong
2020-12-06T23:13:30Z

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 flag.

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>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
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 a21a9f71c0c0..8d3ed07800f6 100644
--- a/fs/xfs/xfs_bmap_item.c
+++ b/fs/xfs/xfs_bmap_item.c
@@ -425,6 +425,10 @@ xfs_bui_validate(
{
struct xfs_map_extent *bmap;

+ 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 c24f2da0f795..937d482c9be4 100644
--- a/fs/xfs/xfs_refcount_item.c
+++ b/fs/xfs/xfs_refcount_item.c
@@ -423,6 +423,9 @@ xfs_cui_validate_phys(
struct xfs_mount *mp,
struct xfs_phys_extent *refc)
{
+ 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 6f3250a22093..9b84017184d9 100644
--- a/fs/xfs/xfs_rmap_item.c
+++ b/fs/xfs/xfs_rmap_item.c
@@ -466,6 +466,9 @@ xfs_rui_validate_map(
struct xfs_mount *mp,
struct xfs_map_extent *rmap)
{
+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return false;
+
if (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS)
return false;