xfs: miscellaneous verifier magic value fixups

Most buffer verifiers have hardcoded magic value checks
conditionalized on the version of the filesystem. The magic value
field of the verifier structure facilitates abstraction of some of
this code. Populate the ->magic field of various verifiers to take
advantage of this abstraction. 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_alloc.c

@@ -568,9 +568,9 @@ xfs_agfl_verify(
 	if (!xfs_sb_version_hascrc(&mp->m_sb))
 		return NULL;
 
-	if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid))
+	if (!xfs_verify_magic(bp, agfl->agfl_magicnum))
 		return __this_address;
-	if (agfl->agfl_magicnum != cpu_to_be32(XFS_AGFL_MAGIC))
+	if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid))
 		return __this_address;
 	/*
 	 * during growfs operations, the perag is not fully initialised,
@@ -643,6 +643,7 @@ xfs_agfl_write_verify(
 
 const struct xfs_buf_ops xfs_agfl_buf_ops = {
 	.name = "xfs_agfl",
+	.magic = { cpu_to_be32(XFS_AGFL_MAGIC), cpu_to_be32(XFS_AGFL_MAGIC) },
 	.verify_read = xfs_agfl_read_verify,
 	.verify_write = xfs_agfl_write_verify,
 	.verify_struct = xfs_agfl_verify,
@@ -2587,8 +2588,10 @@ xfs_agf_verify(
 			return __this_address;
 	}
 
-	if (!(agf->agf_magicnum == cpu_to_be32(XFS_AGF_MAGIC) &&
-	      XFS_AGF_GOOD_VERSION(be32_to_cpu(agf->agf_versionnum)) &&
+	if (!xfs_verify_magic(bp, agf->agf_magicnum))
+		return __this_address;
+
+	if (!(XFS_AGF_GOOD_VERSION(be32_to_cpu(agf->agf_versionnum)) &&
 	      be32_to_cpu(agf->agf_freeblks) <= be32_to_cpu(agf->agf_length) &&
 	      be32_to_cpu(agf->agf_flfirst) < xfs_agfl_size(mp) &&
 	      be32_to_cpu(agf->agf_fllast) < xfs_agfl_size(mp) &&
@@ -2670,6 +2673,7 @@ xfs_agf_write_verify(
 
 const struct xfs_buf_ops xfs_agf_buf_ops = {
 	.name = "xfs_agf",
+	.magic = { cpu_to_be32(XFS_AGF_MAGIC), cpu_to_be32(XFS_AGF_MAGIC) },
 	.verify_read = xfs_agf_read_verify,
 	.verify_write = xfs_agf_write_verify,
 	.verify_struct = xfs_agf_verify,

fs/xfs/libxfs/xfs_attr_leaf.c

@@ -248,21 +248,18 @@ xfs_attr3_leaf_verify(
 
 	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
 
+	if (!xfs_verify_magic(bp, leaf->hdr.info.magic))
+		return __this_address;
+
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 		struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
 
-		if (hdr3->info.hdr.magic != cpu_to_be16(XFS_ATTR3_LEAF_MAGIC))
-			return __this_address;
-
 		if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
 			return __this_address;
 		if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn)
 			return __this_address;
 		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn)))
 			return __this_address;
-	} else {
-		if (leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
-			return __this_address;
 	}
 	/*
 	 * In recovery there is a transient state where count == 0 is valid
@@ -369,6 +366,8 @@ xfs_attr3_leaf_read_verify(
 
 const struct xfs_buf_ops xfs_attr3_leaf_buf_ops = {
 	.name = "xfs_attr3_leaf",
+	.magic = { cpu_to_be16(XFS_ATTR_LEAF_MAGIC),
+		   cpu_to_be16(XFS_ATTR3_LEAF_MAGIC) },
 	.verify_read = xfs_attr3_leaf_read_verify,
 	.verify_write = xfs_attr3_leaf_write_verify,
 	.verify_struct = xfs_attr3_leaf_verify,

fs/xfs/libxfs/xfs_attr_remote.c

@@ -79,6 +79,7 @@ xfs_attr3_rmt_hdr_ok(
 static xfs_failaddr_t
 xfs_attr3_rmt_verify(
 	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
 	void			*ptr,
 	int			fsbsize,
 	xfs_daddr_t		bno)
@@ -87,7 +88,7 @@ xfs_attr3_rmt_verify(
 
 	if (!xfs_sb_version_hascrc(&mp->m_sb))
 		return __this_address;
-	if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC))
+	if (!xfs_verify_magic(bp, rmt->rm_magic))
 		return __this_address;
 	if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid))
 		return __this_address;
@@ -131,7 +132,7 @@ __xfs_attr3_rmt_read_verify(
 			*failaddr = __this_address;
 			return -EFSBADCRC;
 		}
-		*failaddr = xfs_attr3_rmt_verify(mp, ptr, blksize, bno);
+		*failaddr = xfs_attr3_rmt_verify(mp, bp, ptr, blksize, bno);
 		if (*failaddr)
 			return -EFSCORRUPTED;
 		len -= blksize;
@@ -193,7 +194,7 @@ xfs_attr3_rmt_write_verify(
 	while (len > 0) {
 		struct xfs_attr3_rmt_hdr *rmt = (struct xfs_attr3_rmt_hdr *)ptr;
 
-		fa = xfs_attr3_rmt_verify(mp, ptr, blksize, bno);
+		fa = xfs_attr3_rmt_verify(mp, bp, ptr, blksize, bno);
 		if (fa) {
 			xfs_verifier_error(bp, -EFSCORRUPTED, fa);
 			return;
@@ -220,6 +221,7 @@ xfs_attr3_rmt_write_verify(
 
 const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = {
 	.name = "xfs_attr3_rmt",
+	.magic = { 0, cpu_to_be32(XFS_ATTR3_RMT_MAGIC) },
 	.verify_read = xfs_attr3_rmt_read_verify,
 	.verify_write = xfs_attr3_rmt_write_verify,
 	.verify_struct = xfs_attr3_rmt_verify_struct,

fs/xfs/libxfs/xfs_bmap_btree.c

@@ -416,8 +416,10 @@ xfs_bmbt_verify(
 	xfs_failaddr_t		fa;
 	unsigned int		level;
 
-	switch (block->bb_magic) {
-	case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
+	if (!xfs_verify_magic(bp, block->bb_magic))
+		return __this_address;
+
+	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 		/*
 		 * XXX: need a better way of verifying the owner here. Right now
 		 * just make sure there has been one set.
@@ -425,11 +427,6 @@ xfs_bmbt_verify(
 		fa = xfs_btree_lblock_v5hdr_verify(bp, XFS_RMAP_OWN_UNKNOWN);
 		if (fa)
 			return fa;
-		/* fall through */
-	case cpu_to_be32(XFS_BMAP_MAGIC):
-		break;
-	default:
-		return __this_address;
 	}
 
 	/*
@@ -481,6 +478,8 @@ xfs_bmbt_write_verify(
 
 const struct xfs_buf_ops xfs_bmbt_buf_ops = {
 	.name = "xfs_bmbt",
+	.magic = { cpu_to_be32(XFS_BMAP_MAGIC),
+		   cpu_to_be32(XFS_BMAP_CRC_MAGIC) },
 	.verify_read = xfs_bmbt_read_verify,
 	.verify_write = xfs_bmbt_write_verify,
 	.verify_struct = xfs_bmbt_verify,

fs/xfs/libxfs/xfs_da_btree.c

@@ -129,21 +129,18 @@ xfs_da3_node_verify(
 
 	ops->node_hdr_from_disk(&ichdr, hdr);
 
+	if (!xfs_verify_magic(bp, hdr->hdr.info.magic))
+		return __this_address;
+
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 		struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
 
-		if (hdr3->info.hdr.magic != cpu_to_be16(XFS_DA3_NODE_MAGIC))
-			return __this_address;
-
 		if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
 			return __this_address;
 		if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn)
 			return __this_address;
 		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn)))
 			return __this_address;
-	} else {
-		if (hdr->hdr.info.magic != cpu_to_be16(XFS_DA_NODE_MAGIC))
-			return __this_address;
 	}
 	if (ichdr.level == 0)
 		return __this_address;
@@ -257,6 +254,8 @@ xfs_da3_node_verify_struct(
 
 const struct xfs_buf_ops xfs_da3_node_buf_ops = {
 	.name = "xfs_da3_node",
+	.magic = { cpu_to_be16(XFS_DA_NODE_MAGIC),
+		   cpu_to_be16(XFS_DA3_NODE_MAGIC) },
 	.verify_read = xfs_da3_node_read_verify,
 	.verify_write = xfs_da3_node_write_verify,
 	.verify_struct = xfs_da3_node_verify_struct,

fs/xfs/libxfs/xfs_dir2_block.c

@@ -53,18 +53,16 @@ xfs_dir3_block_verify(
 	struct xfs_mount	*mp = bp->b_target->bt_mount;
 	struct xfs_dir3_blk_hdr	*hdr3 = bp->b_addr;
 
+	if (!xfs_verify_magic(bp, hdr3->magic))
+		return __this_address;
+
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
-		if (hdr3->magic != cpu_to_be32(XFS_DIR3_BLOCK_MAGIC))
-			return __this_address;
 		if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
 			return __this_address;
 		if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
 			return __this_address;
 		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
 			return __this_address;
-	} else {
-		if (hdr3->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))
-			return __this_address;
 	}
 	return __xfs_dir3_data_check(NULL, bp);
 }
@@ -112,6 +110,8 @@ xfs_dir3_block_write_verify(
 
 const struct xfs_buf_ops xfs_dir3_block_buf_ops = {
 	.name = "xfs_dir3_block",
+	.magic = { cpu_to_be32(XFS_DIR2_BLOCK_MAGIC),
+		   cpu_to_be32(XFS_DIR3_BLOCK_MAGIC) },
 	.verify_read = xfs_dir3_block_read_verify,
 	.verify_write = xfs_dir3_block_write_verify,
 	.verify_struct = xfs_dir3_block_verify,

fs/xfs/libxfs/xfs_dir2_data.c

@@ -252,18 +252,16 @@ xfs_dir3_data_verify(
 	struct xfs_mount	*mp = bp->b_target->bt_mount;
 	struct xfs_dir3_blk_hdr	*hdr3 = bp->b_addr;
 
+	if (!xfs_verify_magic(bp, hdr3->magic))
+		return __this_address;
+
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
-		if (hdr3->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC))
-			return __this_address;
 		if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
 			return __this_address;
 		if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
 			return __this_address;
 		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
 			return __this_address;
-	} else {
-		if (hdr3->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC))
-			return __this_address;
 	}
 	return __xfs_dir3_data_check(NULL, bp);
 }
@@ -339,6 +337,8 @@ xfs_dir3_data_write_verify(
 
 const struct xfs_buf_ops xfs_dir3_data_buf_ops = {
 	.name = "xfs_dir3_data",
+	.magic = { cpu_to_be32(XFS_DIR2_DATA_MAGIC),
+		   cpu_to_be32(XFS_DIR3_DATA_MAGIC) },
 	.verify_read = xfs_dir3_data_read_verify,
 	.verify_write = xfs_dir3_data_write_verify,
 	.verify_struct = xfs_dir3_data_verify,
@@ -346,6 +346,8 @@ const struct xfs_buf_ops xfs_dir3_data_buf_ops = {
 
 static const struct xfs_buf_ops xfs_dir3_data_reada_buf_ops = {
 	.name = "xfs_dir3_data_reada",
+	.magic = { cpu_to_be32(XFS_DIR2_DATA_MAGIC),
+		   cpu_to_be32(XFS_DIR3_DATA_MAGIC) },
 	.verify_read = xfs_dir3_data_reada_verify,
 	.verify_write = xfs_dir3_data_write_verify,
 };

fs/xfs/libxfs/xfs_dir2_node.c

@@ -87,20 +87,18 @@ xfs_dir3_free_verify(
 	struct xfs_mount	*mp = bp->b_target->bt_mount;
 	struct xfs_dir2_free_hdr *hdr = bp->b_addr;
 
+	if (!xfs_verify_magic(bp, hdr->magic))
+		return __this_address;
+
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 		struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
 
-		if (hdr3->magic != cpu_to_be32(XFS_DIR3_FREE_MAGIC))
-			return __this_address;
 		if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
 			return __this_address;
 		if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
 			return __this_address;
 		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
 			return __this_address;
-	} else {
-		if (hdr->magic != cpu_to_be32(XFS_DIR2_FREE_MAGIC))
-			return __this_address;
 	}
 
 	/* XXX: should bounds check the xfs_dir3_icfree_hdr here */
@@ -151,6 +149,8 @@ xfs_dir3_free_write_verify(
 
 const struct xfs_buf_ops xfs_dir3_free_buf_ops = {
 	.name = "xfs_dir3_free",
+	.magic = { cpu_to_be32(XFS_DIR2_FREE_MAGIC),
+		   cpu_to_be32(XFS_DIR3_FREE_MAGIC) },
 	.verify_read = xfs_dir3_free_read_verify,
 	.verify_write = xfs_dir3_free_write_verify,
 	.verify_struct = xfs_dir3_free_verify,

fs/xfs/libxfs/xfs_ialloc.c

@@ -2508,7 +2508,7 @@ xfs_agi_verify(
 	/*
 	 * Validate the magic number of the agi block.
 	 */
-	if (agi->agi_magicnum != cpu_to_be32(XFS_AGI_MAGIC))
+	if (!xfs_verify_magic(bp, agi->agi_magicnum))
 		return __this_address;
 	if (!XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)))
 		return __this_address;
@@ -2582,6 +2582,7 @@ xfs_agi_write_verify(
 
 const struct xfs_buf_ops xfs_agi_buf_ops = {
 	.name = "xfs_agi",
+	.magic = { cpu_to_be32(XFS_AGI_MAGIC), cpu_to_be32(XFS_AGI_MAGIC) },
 	.verify_read = xfs_agi_read_verify,
 	.verify_write = xfs_agi_write_verify,
 	.verify_struct = xfs_agi_verify,

fs/xfs/libxfs/xfs_refcount_btree.c

@@ -209,7 +209,7 @@ xfs_refcountbt_verify(
 	xfs_failaddr_t		fa;
 	unsigned int		level;
 
-	if (block->bb_magic != cpu_to_be32(XFS_REFC_CRC_MAGIC))
+	if (!xfs_verify_magic(bp, block->bb_magic))
 		return __this_address;
 
 	if (!xfs_sb_version_hasreflink(&mp->m_sb))
@@ -264,6 +264,7 @@ xfs_refcountbt_write_verify(
 
 const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
 	.name			= "xfs_refcountbt",
+	.magic			= { 0, cpu_to_be32(XFS_REFC_CRC_MAGIC) },
 	.verify_read		= xfs_refcountbt_read_verify,
 	.verify_write		= xfs_refcountbt_write_verify,
 	.verify_struct		= xfs_refcountbt_verify,

fs/xfs/libxfs/xfs_rmap_btree.c

@@ -310,7 +310,7 @@ xfs_rmapbt_verify(
 	 * from the on disk AGF. Again, we can only check against maximum limits
 	 * in this case.
 	 */
-	if (block->bb_magic != cpu_to_be32(XFS_RMAP_CRC_MAGIC))
+	if (!xfs_verify_magic(bp, block->bb_magic))
 		return __this_address;
 
 	if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
@@ -365,6 +365,7 @@ xfs_rmapbt_write_verify(
 
 const struct xfs_buf_ops xfs_rmapbt_buf_ops = {
 	.name			= "xfs_rmapbt",
+	.magic			= { 0, cpu_to_be32(XFS_RMAP_CRC_MAGIC) },
 	.verify_read		= xfs_rmapbt_read_verify,
 	.verify_write		= xfs_rmapbt_write_verify,
 	.verify_struct		= xfs_rmapbt_verify,

fs/xfs/libxfs/xfs_sb.c

@@ -229,7 +229,7 @@ xfs_validate_sb_common(
 	uint32_t		agcount = 0;
 	uint32_t		rem;
 
-	if (dsb->sb_magicnum != cpu_to_be32(XFS_SB_MAGIC)) {
+	if (!xfs_verify_magic(bp, dsb->sb_magicnum)) {
 		xfs_warn(mp, "bad magic number");
 		return -EWRONGFS;
 	}
@@ -782,12 +782,14 @@ xfs_sb_write_verify(
 
 const struct xfs_buf_ops xfs_sb_buf_ops = {
 	.name = "xfs_sb",
+	.magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
 	.verify_read = xfs_sb_read_verify,
 	.verify_write = xfs_sb_write_verify,
 };
 
 const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
 	.name = "xfs_sb_quiet",
+	.magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
 	.verify_read = xfs_sb_quiet_read_verify,
 	.verify_write = xfs_sb_write_verify,
 };

fs/xfs/libxfs/xfs_symlink_remote.c

@@ -95,7 +95,7 @@ xfs_symlink_verify(
 
 	if (!xfs_sb_version_hascrc(&mp->m_sb))
 		return __this_address;
-	if (dsl->sl_magic != cpu_to_be32(XFS_SYMLINK_MAGIC))
+	if (!xfs_verify_magic(bp, dsl->sl_magic))
 		return __this_address;
 	if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid))
 		return __this_address;
@@ -159,6 +159,7 @@ xfs_symlink_write_verify(
 
 const struct xfs_buf_ops xfs_symlink_buf_ops = {
 	.name = "xfs_symlink",
+	.magic = { 0, cpu_to_be32(XFS_SYMLINK_MAGIC) },
 	.verify_read = xfs_symlink_read_verify,
 	.verify_write = xfs_symlink_write_verify,
 	.verify_struct = xfs_symlink_verify,