kbuild: rust: keep Rust objects out of Clang LTO with inline helpersgrafted

Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit
`objtool` errors such as:

    vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a:
    can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd

The reason is that in such builds, the Clang invocation that compiles
the combined Rust plus helpers bitcode emits LLVM bitcode (again) --
the final code generation happens in the linker's LTO step, which the
`-mllvm` trap options passed to Clang do not reach.

This, in turn, means that unreachable traps are missing, and the
impossible paths do not merely fallthrough to the next symbol, but past
the end of their own section, since LTO builds place each function in
its own section.

Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always
emits machine code directly, with the traps in place.

Assisted-by: LLM
Cc: Gary Guo <gary@garyguo.net>
Cc: Boqun Feng <boqun@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust")
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 679 insertions, 0 deletions

diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c
new file mode 100644
index 000000000..2ea8cd565
--- /dev/null
+++ b/fs/hfsplus/btree.c
@@ -0,0 +1,679 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/fs/hfsplus/btree.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handle opening/closing btree
+ */
+
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/log2.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+/*
+ * Initial source code of clump size calculation is gotten
+ * from http://opensource.apple.com/tarballs/diskdev_cmds/
+ */
+#define CLUMP_ENTRIES	15
+
+static short clumptbl[CLUMP_ENTRIES * 3] = {
+/*
+ *	    Volume	Attributes	 Catalog	 Extents
+ *	     Size	Clump (MB)	Clump (MB)	Clump (MB)
+ */
+	/*   1GB */	  4,		  4,		 4,
+	/*   2GB */	  6,		  6,		 4,
+	/*   4GB */	  8,		  8,		 4,
+	/*   8GB */	 11,		 11,		 5,
+	/*
+	 * For volumes 16GB and larger, we want to make sure that a full OS
+	 * install won't require fragmentation of the Catalog or Attributes
+	 * B-trees.  We do this by making the clump sizes sufficiently large,
+	 * and by leaving a gap after the B-trees for them to grow into.
+	 *
+	 * For SnowLeopard 10A298, a FullNetInstall with all packages selected
+	 * results in:
+	 * Catalog B-tree Header
+	 *	nodeSize:          8192
+	 *	totalNodes:       31616
+	 *	freeNodes:         1978
+	 * (used = 231.55 MB)
+	 * Attributes B-tree Header
+	 *	nodeSize:          8192
+	 *	totalNodes:       63232
+	 *	freeNodes:          958
+	 * (used = 486.52 MB)
+	 *
+	 * We also want Time Machine backup volumes to have a sufficiently
+	 * large clump size to reduce fragmentation.
+	 *
+	 * The series of numbers for Catalog and Attribute form a geometric
+	 * series. For Catalog (16GB to 512GB), each term is 8**(1/5) times
+	 * the previous term.  For Attributes (16GB to 512GB), each term is
+	 * 4**(1/5) times the previous term.  For 1TB to 16TB, each term is
+	 * 2**(1/5) times the previous term.
+	 */
+	/*  16GB */	 64,		 32,		 5,
+	/*  32GB */	 84,		 49,		 6,
+	/*  64GB */	111,		 74,		 7,
+	/* 128GB */	147,		111,		 8,
+	/* 256GB */	194,		169,		 9,
+	/* 512GB */	256,		256,		11,
+	/*   1TB */	294,		294,		14,
+	/*   2TB */	338,		338,		16,
+	/*   4TB */	388,		388,		20,
+	/*   8TB */	446,		446,		25,
+	/*  16TB */	512,		512,		32
+};
+
+u32 hfsplus_calc_btree_clump_size(u32 block_size, u32 node_size,
+					u64 sectors, int file_id)
+{
+	u32 mod = max(node_size, block_size);
+	u32 clump_size;
+	int column;
+	int i;
+
+	/* Figure out which column of the above table to use for this file. */
+	switch (file_id) {
+	case HFSPLUS_ATTR_CNID:
+		column = 0;
+		break;
+	case HFSPLUS_CAT_CNID:
+		column = 1;
+		break;
+	default:
+		column = 2;
+		break;
+	}
+
+	/*
+	 * The default clump size is 0.8% of the volume size. And
+	 * it must also be a multiple of the node and block size.
+	 */
+	if (sectors < 0x200000) {
+		clump_size = sectors << 2;	/*  0.8 %  */
+		if (clump_size < (8 * node_size))
+			clump_size = 8 * node_size;
+	} else {
+		/* turn exponent into table index... */
+		for (i = 0, sectors = sectors >> 22;
+		     sectors && (i < CLUMP_ENTRIES - 1);
+		     ++i, sectors = sectors >> 1) {
+			/* empty body */
+		}
+
+		clump_size = clumptbl[column + (i) * 3] * 1024 * 1024;
+	}
+
+	/*
+	 * Round the clump size to a multiple of node and block size.
+	 * NOTE: This rounds down.
+	 */
+	clump_size /= mod;
+	clump_size *= mod;
+
+	/*
+	 * Rounding down could have rounded down to 0 if the block size was
+	 * greater than the clump size.  If so, just use one block or node.
+	 */
+	if (clump_size == 0)
+		clump_size = mod;
+
+	return clump_size;
+}
+
+/* Context for iterating b-tree map pages
+ * @page_idx: The index of the page within the b-node's page array
+ * @off: The byte offset within the mapped page
+ * @len: The remaining length of the map record
+ */
+struct hfs_bmap_ctx {
+	unsigned int page_idx;
+	unsigned int off;
+	u16 len;
+};
+
+/*
+ * Finds the specific page containing the requested byte offset within the map
+ * record. Automatically handles the difference between header and map nodes.
+ * Returns the struct page pointer, or an ERR_PTR on failure.
+ * Note: The caller is responsible for mapping/unmapping the returned page.
+ */
+static struct page *hfs_bmap_get_map_page(struct hfs_bnode *node,
+					  struct hfs_bmap_ctx *ctx,
+					  u32 byte_offset)
+{
+	u16 rec_idx, off16;
+	unsigned int page_off;
+
+	if (node->this == HFSPLUS_TREE_HEAD) {
+		if (node->type != HFS_NODE_HEADER) {
+			pr_err("hfsplus: invalid btree header node\n");
+			return ERR_PTR(-EIO);
+		}
+		rec_idx = HFSPLUS_BTREE_HDR_MAP_REC_INDEX;
+	} else {
+		if (node->type != HFS_NODE_MAP) {
+			pr_err("hfsplus: invalid btree map node\n");
+			return ERR_PTR(-EIO);
+		}
+		rec_idx = HFSPLUS_BTREE_MAP_NODE_REC_INDEX;
+	}
+
+	ctx->len = hfs_brec_lenoff(node, rec_idx, &off16);
+	if (hfs_brec_len_invalid(node, ctx->len))
+		return ERR_PTR(-EINVAL);
+
+	if (!is_bnode_offset_valid(node, off16))
+		return ERR_PTR(-EIO);
+
+	ctx->len = check_and_correct_requested_length(node, off16, ctx->len);
+
+	if (byte_offset >= ctx->len)
+		return ERR_PTR(-EINVAL);
+
+	page_off = (u32)off16 + node->page_offset + byte_offset;
+	ctx->page_idx = page_off >> PAGE_SHIFT;
+	ctx->off = page_off & ~PAGE_MASK;
+
+	return node->page[ctx->page_idx];
+}
+
+/**
+ * hfs_bmap_test_bit - test a bit in the b-tree map
+ * @node: the b-tree node containing the map record
+ * @node_bit_idx: the relative bit index within the node's map record
+ *
+ * Returns true if set, false if clear or on failure.
+ */
+static bool hfs_bmap_test_bit(struct hfs_bnode *node, u32 node_bit_idx)
+{
+	struct hfs_bmap_ctx ctx;
+	struct page *page;
+	u8 *bmap, byte, mask;
+
+	page = hfs_bmap_get_map_page(node, &ctx, node_bit_idx / BITS_PER_BYTE);
+	if (IS_ERR(page))
+		return false;
+
+	bmap = kmap_local_page(page);
+	byte = bmap[ctx.off];
+	kunmap_local(bmap);
+
+	mask = 1 << (7 - (node_bit_idx % BITS_PER_BYTE));
+	return (byte & mask) != 0;
+}
+
+
+/**
+ * hfs_bmap_clear_bit - clear a bit in the b-tree map
+ * @node: the b-tree node containing the map record
+ * @node_bit_idx: the relative bit index within the node's map record
+ *
+ * Returns 0 on success, -EINVAL if already clear, or negative error code.
+ */
+static int hfs_bmap_clear_bit(struct hfs_bnode *node, u32 node_bit_idx)
+{
+	struct hfs_bmap_ctx ctx;
+	struct page *page;
+	u8 *bmap, mask;
+
+	page = hfs_bmap_get_map_page(node, &ctx, node_bit_idx / BITS_PER_BYTE);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
+
+	bmap = kmap_local_page(page);
+
+	mask = 1 << (7 - (node_bit_idx % BITS_PER_BYTE));
+
+	if (!(bmap[ctx.off] & mask)) {
+		kunmap_local(bmap);
+		return -EINVAL;
+	}
+
+	bmap[ctx.off] &= ~mask;
+	set_page_dirty(page);
+	kunmap_local(bmap);
+
+	return 0;
+}
+
+#define HFS_EXTENT_TREE_NAME  "Extents Overflow File"
+#define HFS_CATALOG_TREE_NAME "Catalog File"
+#define HFS_ATTR_TREE_NAME    "Attributes File"
+#define HFS_UNKNOWN_TREE_NAME "Unknown B-tree"
+
+static const char *hfs_btree_name(u32 cnid)
+{
+	switch (cnid) {
+	case HFSPLUS_EXT_CNID:
+		return HFS_EXTENT_TREE_NAME;
+	case HFSPLUS_CAT_CNID:
+		return HFS_CATALOG_TREE_NAME;
+	case HFSPLUS_ATTR_CNID:
+		return HFS_ATTR_TREE_NAME;
+	default:
+		return HFS_UNKNOWN_TREE_NAME;
+	}
+}
+
+/* Get a reference to a B*Tree and do some initial checks */
+struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
+{
+	struct hfs_btree *tree;
+	struct hfs_btree_header_rec *head;
+	struct address_space *mapping;
+	struct hfs_bnode *node;
+	struct inode *inode;
+	struct page *page;
+	unsigned int size;
+
+	tree = kzalloc_obj(*tree);
+	if (!tree)
+		return NULL;
+
+	mutex_init(&tree->tree_lock);
+	spin_lock_init(&tree->hash_lock);
+	tree->sb = sb;
+	tree->cnid = id;
+	inode = hfsplus_iget(sb, id);
+	if (IS_ERR(inode))
+		goto free_tree;
+	tree->inode = inode;
+
+	if (!HFSPLUS_I(tree->inode)->first_blocks) {
+		pr_err("invalid btree extent records (0 size)\n");
+		goto free_inode;
+	}
+
+	mapping = tree->inode->i_mapping;
+	page = read_mapping_page(mapping, 0, NULL);
+	if (IS_ERR(page))
+		goto free_inode;
+
+	/* Load the header */
+	head = (struct hfs_btree_header_rec *)(kmap_local_page(page) +
+		sizeof(struct hfs_bnode_desc));
+	tree->root = be32_to_cpu(head->root);
+	tree->leaf_count = be32_to_cpu(head->leaf_count);
+	tree->leaf_head = be32_to_cpu(head->leaf_head);
+	tree->leaf_tail = be32_to_cpu(head->leaf_tail);
+	tree->node_count = be32_to_cpu(head->node_count);
+	tree->free_nodes = be32_to_cpu(head->free_nodes);
+	tree->attributes = be32_to_cpu(head->attributes);
+	tree->node_size = be16_to_cpu(head->node_size);
+	tree->max_key_len = be16_to_cpu(head->max_key_len);
+	tree->depth = be16_to_cpu(head->depth);
+
+	/* Verify the tree and set the correct compare function */
+	switch (id) {
+	case HFSPLUS_EXT_CNID:
+		if (tree->max_key_len != HFSPLUS_EXT_KEYLEN - sizeof(u16)) {
+			pr_err("invalid extent max_key_len %d\n",
+				tree->max_key_len);
+			goto fail_page;
+		}
+		if (tree->attributes & HFS_TREE_VARIDXKEYS) {
+			pr_err("invalid extent btree flag\n");
+			goto fail_page;
+		}
+
+		tree->keycmp = hfsplus_ext_cmp_key;
+		break;
+	case HFSPLUS_CAT_CNID:
+		if (tree->max_key_len != HFSPLUS_CAT_KEYLEN - sizeof(u16)) {
+			pr_err("invalid catalog max_key_len %d\n",
+				tree->max_key_len);
+			goto fail_page;
+		}
+		if (!(tree->attributes & HFS_TREE_VARIDXKEYS)) {
+			pr_err("invalid catalog btree flag\n");
+			goto fail_page;
+		}
+
+		if (test_bit(HFSPLUS_SB_HFSX, &HFSPLUS_SB(sb)->flags) &&
+		    (head->key_type == HFSPLUS_KEY_BINARY))
+			tree->keycmp = hfsplus_cat_bin_cmp_key;
+		else {
+			tree->keycmp = hfsplus_cat_case_cmp_key;
+			set_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
+		}
+		break;
+	case HFSPLUS_ATTR_CNID:
+		if (tree->max_key_len != HFSPLUS_ATTR_KEYLEN - sizeof(u16)) {
+			pr_err("invalid attributes max_key_len %d\n",
+				tree->max_key_len);
+			goto fail_page;
+		}
+		tree->keycmp = hfsplus_attr_bin_cmp_key;
+		break;
+	default:
+		pr_err("unknown B*Tree requested\n");
+		goto fail_page;
+	}
+
+	if (!(tree->attributes & HFS_TREE_BIGKEYS)) {
+		pr_err("invalid btree flag\n");
+		goto fail_page;
+	}
+
+	size = tree->node_size;
+	if (size < HFSPLUS_NODE_MINSZ || size > HFSPLUS_NODE_MXSZ)
+		goto fail_page;
+	if (!is_power_of_2(size))
+		goto fail_page;
+	if (!tree->node_count)
+		goto fail_page;
+
+	tree->node_size_shift = ffs(size) - 1;
+
+	tree->pages_per_bnode =
+		(tree->node_size + PAGE_SIZE - 1) >>
+		PAGE_SHIFT;
+
+	kunmap_local(head);
+	put_page(page);
+
+	node = hfs_bnode_find(tree, HFSPLUS_TREE_HEAD);
+	if (IS_ERR(node))
+		goto free_inode;
+
+	if (!hfs_bmap_test_bit(node, 0)) {
+		pr_warn("(%s): %s (cnid 0x%x) map record invalid or bitmap corruption detected, forcing read-only.\n",
+				sb->s_id, hfs_btree_name(id), id);
+		pr_warn("Run fsck.hfsplus to repair.\n");
+		sb->s_flags |= SB_RDONLY;
+	}
+
+	hfs_bnode_put(node);
+
+	return tree;
+
+ fail_page:
+	kunmap_local(head);
+	put_page(page);
+ free_inode:
+	tree->inode->i_mapping->a_ops = &hfsplus_aops;
+	iput(tree->inode);
+ free_tree:
+	kfree(tree);
+	return NULL;
+}
+
+/* Release resources used by a btree */
+void hfs_btree_close(struct hfs_btree *tree)
+{
+	struct hfs_bnode *node;
+	int i;
+
+	if (!tree)
+		return;
+
+	for (i = 0; i < NODE_HASH_SIZE; i++) {
+		while ((node = tree->node_hash[i])) {
+			tree->node_hash[i] = node->next_hash;
+			if (atomic_read(&node->refcnt))
+				pr_crit("node %d:%d "
+						"still has %d user(s)!\n",
+					node->tree->cnid, node->this,
+					atomic_read(&node->refcnt));
+			hfs_bnode_free(node);
+			tree->node_hash_cnt--;
+		}
+	}
+	iput(tree->inode);
+	kfree(tree);
+}
+
+int hfs_btree_write(struct hfs_btree *tree)
+{
+	struct hfs_btree_header_rec *head;
+	struct hfs_bnode *node;
+	struct page *page;
+
+	node = hfs_bnode_find(tree, 0);
+	if (IS_ERR(node))
+		/* panic? */
+		return -EIO;
+	/* Load the header */
+	page = node->page[0];
+	head = (struct hfs_btree_header_rec *)(kmap_local_page(page) +
+		sizeof(struct hfs_bnode_desc));
+
+	head->root = cpu_to_be32(tree->root);
+	head->leaf_count = cpu_to_be32(tree->leaf_count);
+	head->leaf_head = cpu_to_be32(tree->leaf_head);
+	head->leaf_tail = cpu_to_be32(tree->leaf_tail);
+	head->node_count = cpu_to_be32(tree->node_count);
+	head->free_nodes = cpu_to_be32(tree->free_nodes);
+	head->attributes = cpu_to_be32(tree->attributes);
+	head->depth = cpu_to_be16(tree->depth);
+
+	kunmap_local(head);
+	set_page_dirty(page);
+	hfs_bnode_put(node);
+	return 0;
+}
+
+static struct hfs_bnode *hfs_bmap_new_bmap(struct hfs_bnode *prev, u32 idx)
+{
+	struct hfs_btree *tree = prev->tree;
+	struct hfs_bnode *node;
+	struct hfs_bnode_desc desc;
+	__be32 cnid;
+
+	node = hfs_bnode_create(tree, idx);
+	if (IS_ERR(node))
+		return node;
+
+	tree->free_nodes--;
+	prev->next = idx;
+	cnid = cpu_to_be32(idx);
+	hfs_bnode_write(prev, &cnid, offsetof(struct hfs_bnode_desc, next), 4);
+
+	node->type = HFS_NODE_MAP;
+	node->num_recs = 1;
+	hfs_bnode_clear(node, 0, tree->node_size);
+	desc.next = 0;
+	desc.prev = 0;
+	desc.type = HFS_NODE_MAP;
+	desc.height = 0;
+	desc.num_recs = cpu_to_be16(1);
+	desc.reserved = 0;
+	hfs_bnode_write(node, &desc, 0, sizeof(desc));
+	hfs_bnode_write_u16(node, 14, 0x8000);
+	hfs_bnode_write_u16(node, tree->node_size - 2, 14);
+	hfs_bnode_write_u16(node, tree->node_size - 4, tree->node_size - 6);
+
+	return node;
+}
+
+/* Make sure @tree has enough space for the @rsvd_nodes */
+int hfs_bmap_reserve(struct hfs_btree *tree, u32 rsvd_nodes)
+{
+	struct inode *inode = tree->inode;
+	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
+	u32 count;
+	int res;
+
+	lockdep_assert_held(&tree->tree_lock);
+
+	if (rsvd_nodes <= 0)
+		return 0;
+
+	while (tree->free_nodes < rsvd_nodes) {
+		res = hfsplus_file_extend(inode, hfs_bnode_need_zeroout(tree));
+		if (res)
+			return res;
+		hip->phys_size = inode->i_size =
+			(loff_t)hip->alloc_blocks <<
+				HFSPLUS_SB(tree->sb)->alloc_blksz_shift;
+		hip->fs_blocks =
+			hip->alloc_blocks << HFSPLUS_SB(tree->sb)->fs_shift;
+		inode_set_bytes(inode, inode->i_size);
+		count = inode->i_size >> tree->node_size_shift;
+		tree->free_nodes += count - tree->node_count;
+		tree->node_count = count;
+	}
+	return 0;
+}
+
+struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *tree)
+{
+	struct hfs_bnode *node, *next_node;
+	struct hfs_bmap_ctx ctx;
+	struct page *page;
+	u32 nidx, idx;
+	u8 *data, byte, m;
+	int i, res;
+
+	lockdep_assert_held(&tree->tree_lock);
+
+	res = hfs_bmap_reserve(tree, 1);
+	if (res)
+		return ERR_PTR(res);
+
+	nidx = 0;
+	node = hfs_bnode_find(tree, nidx);
+	if (IS_ERR(node))
+		return node;
+
+	page = hfs_bmap_get_map_page(node, &ctx, 0);
+	if (IS_ERR(page)) {
+		res = PTR_ERR(page);
+		hfs_bnode_put(node);
+		return ERR_PTR(res);
+	}
+
+	data = kmap_local_page(page);
+	idx = 0;
+
+	for (;;) {
+		while (ctx.len) {
+			byte = data[ctx.off];
+			if (byte != 0xff) {
+				for (m = 0x80, i = 0; i < 8; m >>= 1, i++) {
+					if (!(byte & m)) {
+						idx += i;
+						data[ctx.off] |= m;
+						set_page_dirty(page);
+						kunmap_local(data);
+						tree->free_nodes--;
+						hfs_btree_write(tree);
+						mark_inode_dirty(tree->inode);
+						hfs_bnode_put(node);
+						return hfs_bnode_create(tree,
+							idx);
+					}
+				}
+			}
+			if (++ctx.off >= PAGE_SIZE) {
+				kunmap_local(data);
+				page = node->page[++ctx.page_idx];
+				data = kmap_local_page(page);
+				ctx.off = 0;
+			}
+			idx += 8;
+			ctx.len--;
+		}
+		kunmap_local(data);
+		nidx = node->next;
+		if (!nidx) {
+			hfs_dbg("create new bmap node\n");
+			next_node = hfs_bmap_new_bmap(node, idx);
+			hfs_btree_write(tree);
+		} else
+			next_node = hfs_bnode_find(tree, nidx);
+		hfs_bnode_put(node);
+		if (IS_ERR(next_node))
+			return next_node;
+		node = next_node;
+
+		page = hfs_bmap_get_map_page(node, &ctx, 0);
+		if (IS_ERR(page)) {
+			res = PTR_ERR(page);
+			hfs_bnode_put(node);
+			return ERR_PTR(res);
+		}
+		data = kmap_local_page(page);
+	}
+}
+
+void hfs_bmap_free(struct hfs_bnode *node)
+{
+	struct hfs_btree *tree;
+	u16 off, len;
+	u32 nidx;
+	int res;
+
+	hfs_dbg("node %u\n", node->this);
+	BUG_ON(!node->this);
+	tree = node->tree;
+	lockdep_assert_held(&tree->tree_lock);
+	nidx = node->this;
+	node = hfs_bnode_find(tree, 0);
+	if (IS_ERR(node))
+		return;
+	len = hfs_brec_lenoff(node, 2, &off);
+	if (hfs_brec_len_invalid(node, len)) {
+		pr_err("invalid bmap record length: node %u, len %u\n",
+		       node->this, len);
+		hfs_bnode_put(node);
+		return;
+	}
+	while (nidx >= len * 8) {
+		u32 i;
+
+		nidx -= len * 8;
+		i = node->next;
+		if (!i) {
+			/* panic */;
+			pr_crit("unable to free bnode %u. "
+					"bmap not found!\n",
+				node->this);
+			hfs_bnode_put(node);
+			return;
+		}
+		hfs_bnode_put(node);
+		node = hfs_bnode_find(tree, i);
+		if (IS_ERR(node))
+			return;
+		if (node->type != HFS_NODE_MAP) {
+			/* panic */;
+			pr_crit("invalid bmap found! "
+					"(%u,%d)\n",
+				node->this, node->type);
+			hfs_bnode_put(node);
+			return;
+		}
+		len = hfs_brec_lenoff(node, 0, &off);
+		if (hfs_brec_len_invalid(node, len)) {
+			pr_err("invalid bmap record length: node %u, len %u\n",
+			       node->this, len);
+			hfs_bnode_put(node);
+			return;
+		}
+	}
+
+	res = hfs_bmap_clear_bit(node, nidx);
+	if (res == -EINVAL) {
+		pr_crit("trying to free the freed bnode %u(%d)\n",
+			nidx, node->type);
+	} else if (res) {
+		pr_crit("fail to free bnode %u(%d)\n",
+			nidx, node->type);
+	} else {
+		tree->free_nodes++;
+		hfs_btree_write(tree);
+		mark_inode_dirty(tree->inode);
+	}
+
+	hfs_bnode_put(node);
+}