xfs: split up allocation btree verifier

Similar to the inode btree verifier, the same allocation btree
verifier structure is shared between the by-bno (bnobt) and by-size
(cntbt) btrees. This prevents the ability to distinguish magic
values between them. Separate the verifier into two, one for each
tree, and assign them appropriately. No functional changes.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_ag.c

@@ -339,14 +339,14 @@ xfs_ag_init_headers(
 	{ /* BNO root block */
 		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
 		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_allocbt_buf_ops,
+		.ops = &xfs_bnobt_buf_ops,
 		.work = &xfs_bnoroot_init,
 		.need_init = true
 	},
 	{ /* CNT root block */
 		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
 		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_allocbt_buf_ops,
+		.ops = &xfs_cntbt_buf_ops,
 		.work = &xfs_cntroot_init,
 		.need_init = true
 	},

fs/xfs/libxfs/xfs_alloc_btree.c

@@ -377,13 +377,19 @@ xfs_allocbt_write_verify(
 
 }
 
-const struct xfs_buf_ops xfs_allocbt_buf_ops = {
-	.name = "xfs_allocbt",
+const struct xfs_buf_ops xfs_bnobt_buf_ops = {
+	.name = "xfs_bnobt",
 	.verify_read = xfs_allocbt_read_verify,
 	.verify_write = xfs_allocbt_write_verify,
 	.verify_struct = xfs_allocbt_verify,
 };
 
+const struct xfs_buf_ops xfs_cntbt_buf_ops = {
+	.name = "xfs_cntbt",
+	.verify_read = xfs_allocbt_read_verify,
+	.verify_write = xfs_allocbt_write_verify,
+	.verify_struct = xfs_allocbt_verify,
+};
 
 STATIC int
 xfs_bnobt_keys_inorder(
@@ -448,7 +454,7 @@ static const struct xfs_btree_ops xfs_bnobt_ops = {
 	.init_rec_from_cur	= xfs_allocbt_init_rec_from_cur,
 	.init_ptr_from_cur	= xfs_allocbt_init_ptr_from_cur,
 	.key_diff		= xfs_bnobt_key_diff,
-	.buf_ops		= &xfs_allocbt_buf_ops,
+	.buf_ops		= &xfs_bnobt_buf_ops,
 	.diff_two_keys		= xfs_bnobt_diff_two_keys,
 	.keys_inorder		= xfs_bnobt_keys_inorder,
 	.recs_inorder		= xfs_bnobt_recs_inorder,
@@ -470,7 +476,7 @@ static const struct xfs_btree_ops xfs_cntbt_ops = {
 	.init_rec_from_cur	= xfs_allocbt_init_rec_from_cur,
 	.init_ptr_from_cur	= xfs_allocbt_init_ptr_from_cur,
 	.key_diff		= xfs_cntbt_key_diff,
-	.buf_ops		= &xfs_allocbt_buf_ops,
+	.buf_ops		= &xfs_cntbt_buf_ops,
 	.diff_two_keys		= xfs_cntbt_diff_two_keys,
 	.keys_inorder		= xfs_cntbt_keys_inorder,
 	.recs_inorder		= xfs_cntbt_recs_inorder,

fs/xfs/libxfs/xfs_shared.h

@@ -25,7 +25,8 @@ extern const struct xfs_buf_ops xfs_agf_buf_ops;
 extern const struct xfs_buf_ops xfs_agi_buf_ops;
 extern const struct xfs_buf_ops xfs_agf_buf_ops;
 extern const struct xfs_buf_ops xfs_agfl_buf_ops;
-extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
+extern const struct xfs_buf_ops xfs_bnobt_buf_ops;
+extern const struct xfs_buf_ops xfs_cntbt_buf_ops;
 extern const struct xfs_buf_ops xfs_rmapbt_buf_ops;
 extern const struct xfs_buf_ops xfs_refcountbt_buf_ops;
 extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;

fs/xfs/scrub/agheader_repair.c

@@ -341,12 +341,12 @@ xrep_agf(
 	struct xrep_find_ag_btree	fab[XREP_AGF_MAX] = {
 		[XREP_AGF_BNOBT] = {
 			.rmap_owner = XFS_RMAP_OWN_AG,
-			.buf_ops = &xfs_allocbt_buf_ops,
+			.buf_ops = &xfs_bnobt_buf_ops,
 			.magic = XFS_ABTB_CRC_MAGIC,
 		},
 		[XREP_AGF_CNTBT] = {
 			.rmap_owner = XFS_RMAP_OWN_AG,
-			.buf_ops = &xfs_allocbt_buf_ops,
+			.buf_ops = &xfs_cntbt_buf_ops,
 			.magic = XFS_ABTC_CRC_MAGIC,
 		},
 		[XREP_AGF_RMAPBT] = {

fs/xfs/xfs_log_recover.c

@@ -2439,10 +2439,12 @@ xlog_recover_validate_buf_type(
 	case XFS_BLFT_BTREE_BUF:
 		switch (magic32) {
 		case XFS_ABTB_CRC_MAGIC:
-		case XFS_ABTC_CRC_MAGIC:
 		case XFS_ABTB_MAGIC:
+			bp->b_ops = &xfs_bnobt_buf_ops;
+			break;
+		case XFS_ABTC_CRC_MAGIC:
 		case XFS_ABTC_MAGIC:
-			bp->b_ops = &xfs_allocbt_buf_ops;
+			bp->b_ops = &xfs_cntbt_buf_ops;
 			break;
 		case XFS_IBT_CRC_MAGIC:
 		case XFS_IBT_MAGIC: