xfs: don't log the entire end of the AGF

When we're logging the last non-spare field in the AGF, we don't
need to log the spare fields, so plumb in a new AGF logging flag
to help us avoid that.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>

2 files changed, 6 insertions, 2 deletions

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 3dd8f1d54498..05b5243d89f6 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -2278,6 +2278,8 @@ xfs_alloc_log_agf(
                 offsetof(xfs_agf_t, agf_btreeblks),
                 offsetof(xfs_agf_t, agf_uuid),
                 offsetof(xfs_agf_t, agf_rmap_blocks),
+                /* needed so that we don't log the whole rest of the structure: */
+                offsetof(xfs_agf_t, agf_spare64),
                 sizeof(xfs_agf_t)
         };
 
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index e6a8bea0f7ba..270fb5cf4fa1 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -674,7 +674,8 @@ typedef struct xfs_agf {
 #define XFS_AGF_BTREEBLKS       0x00000800
 #define XFS_AGF_UUID            0x00001000
 #define XFS_AGF_RMAP_BLOCKS     0x00002000
-#define XFS_AGF_NUM_BITS        14
+#define XFS_AGF_SPARE64         0x00004000
+#define XFS_AGF_NUM_BITS        15
 #define XFS_AGF_ALL_BITS        ((1 << XFS_AGF_NUM_BITS) - 1)
 
 #define XFS_AGF_FLAGS \
@@ -691,7 +692,8 @@ typedef struct xfs_agf {
         { XFS_AGF_LONGEST,      "LONGEST" }, \
         { XFS_AGF_BTREEBLKS,    "BTREEBLKS" }, \
         { XFS_AGF_UUID,         "UUID" }, \
-        { XFS_AGF_RMAP_BLOCKS,  "RMAP_BLOCKS" }
+        { XFS_AGF_RMAP_BLOCKS,  "RMAP_BLOCKS" }, \
+        { XFS_AGF_SPARE64,      "SPARE64" }
 
 /* disk block (xfs_daddr_t) in the AG */
 #define XFS_AGF_DADDR(mp)       ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))