Creation of Cybook 2416 (actually Gen4) repository

fs/hfsplus/Makefile

@@ -0,0 +1,9 @@
+#
+## Makefile for the linux hfsplus filesystem routines.
+#
+
+obj-$(CONFIG_HFSPLUS_FS) += hfsplus.o
+
+hfsplus-objs := super.o options.o inode.o ioctl.o extents.o catalog.o dir.o btree.o \
+		bnode.o brec.o bfind.o tables.o unicode.o wrapper.o bitmap.o part_tbl.o
+

fs/hfsplus/bfind.c

@@ -0,0 +1,209 @@
+/*
+ *  linux/fs/hfsplus/bfind.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Search routines for btrees
+ */
+
+#include <linux/slab.h>
+#include "hfsplus_fs.h"
+
+int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
+{
+	void *ptr;
+
+	fd->tree = tree;
+	fd->bnode = NULL;
+	ptr = kmalloc(tree->max_key_len * 2 + 4, GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+	fd->search_key = ptr;
+	fd->key = ptr + tree->max_key_len + 2;
+	dprint(DBG_BNODE_REFS, "find_init: %d (%p)\n", tree->cnid, __builtin_return_address(0));
+	down(&tree->tree_lock);
+	return 0;
+}
+
+void hfs_find_exit(struct hfs_find_data *fd)
+{
+	hfs_bnode_put(fd->bnode);
+	kfree(fd->search_key);
+	dprint(DBG_BNODE_REFS, "find_exit: %d (%p)\n", fd->tree->cnid, __builtin_return_address(0));
+	up(&fd->tree->tree_lock);
+	fd->tree = NULL;
+}
+
+/* Find the record in bnode that best matches key (not greater than...)*/
+int __hfs_brec_find(struct hfs_bnode *bnode, struct hfs_find_data *fd)
+{
+	int cmpval;
+	u16 off, len, keylen;
+	int rec;
+	int b, e;
+	int res;
+
+	b = 0;
+	e = bnode->num_recs - 1;
+	res = -ENOENT;
+	do {
+		rec = (e + b) / 2;
+		len = hfs_brec_lenoff(bnode, rec, &off);
+		keylen = hfs_brec_keylen(bnode, rec);
+		hfs_bnode_read(bnode, fd->key, off, keylen);
+		cmpval = bnode->tree->keycmp(fd->key, fd->search_key);
+		if (!cmpval) {
+			e = rec;
+			res = 0;
+			goto done;
+		}
+		if (cmpval < 0)
+			b = rec + 1;
+		else
+			e = rec - 1;
+	} while (b <= e);
+	if (rec != e && e >= 0) {
+		len = hfs_brec_lenoff(bnode, e, &off);
+		keylen = hfs_brec_keylen(bnode, e);
+		hfs_bnode_read(bnode, fd->key, off, keylen);
+	}
+done:
+	fd->record = e;
+	fd->keyoffset = off;
+	fd->keylength = keylen;
+	fd->entryoffset = off + keylen;
+	fd->entrylength = len - keylen;
+	return res;
+}
+
+/* Traverse a B*Tree from the root to a leaf finding best fit to key */
+/* Return allocated copy of node found, set recnum to best record */
+int hfs_brec_find(struct hfs_find_data *fd)
+{
+	struct hfs_btree *tree;
+	struct hfs_bnode *bnode;
+	u32 nidx, parent;
+	__be32 data;
+	int height, res;
+
+	tree = fd->tree;
+	if (fd->bnode)
+		hfs_bnode_put(fd->bnode);
+	fd->bnode = NULL;
+	nidx = tree->root;
+	if (!nidx)
+		return -ENOENT;
+	height = tree->depth;
+	res = 0;
+	parent = 0;
+	for (;;) {
+		bnode = hfs_bnode_find(tree, nidx);
+		if (IS_ERR(bnode)) {
+			res = PTR_ERR(bnode);
+			bnode = NULL;
+			break;
+		}
+		if (bnode->height != height)
+			goto invalid;
+		if (bnode->type != (--height ? HFS_NODE_INDEX : HFS_NODE_LEAF))
+			goto invalid;
+		bnode->parent = parent;
+
+		res = __hfs_brec_find(bnode, fd);
+		if (!height)
+			break;
+		if (fd->record < 0)
+			goto release;
+
+		parent = nidx;
+		hfs_bnode_read(bnode, &data, fd->entryoffset, 4);
+		nidx = be32_to_cpu(data);
+		hfs_bnode_put(bnode);
+	}
+	fd->bnode = bnode;
+	return res;
+
+invalid:
+	printk(KERN_ERR "hfs: inconsistency in B*Tree (%d,%d,%d,%u,%u)\n",
+		height, bnode->height, bnode->type, nidx, parent);
+	res = -EIO;
+release:
+	hfs_bnode_put(bnode);
+	return res;
+}
+
+int hfs_brec_read(struct hfs_find_data *fd, void *rec, int rec_len)
+{
+	int res;
+
+	res = hfs_brec_find(fd);
+	if (res)
+		return res;
+	if (fd->entrylength > rec_len)
+		return -EINVAL;
+	hfs_bnode_read(fd->bnode, rec, fd->entryoffset, fd->entrylength);
+	return 0;
+}
+
+int hfs_brec_goto(struct hfs_find_data *fd, int cnt)
+{
+	struct hfs_btree *tree;
+	struct hfs_bnode *bnode;
+	int idx, res = 0;
+	u16 off, len, keylen;
+
+	bnode = fd->bnode;
+	tree = bnode->tree;
+
+	if (cnt < 0) {
+		cnt = -cnt;
+		while (cnt > fd->record) {
+			cnt -= fd->record + 1;
+			fd->record = bnode->num_recs - 1;
+			idx = bnode->prev;
+			if (!idx) {
+				res = -ENOENT;
+				goto out;
+			}
+			hfs_bnode_put(bnode);
+			bnode = hfs_bnode_find(tree, idx);
+			if (IS_ERR(bnode)) {
+				res = PTR_ERR(bnode);
+				bnode = NULL;
+				goto out;
+			}
+		}
+		fd->record -= cnt;
+	} else {
+		while (cnt >= bnode->num_recs - fd->record) {
+			cnt -= bnode->num_recs - fd->record;
+			fd->record = 0;
+			idx = bnode->next;
+			if (!idx) {
+				res = -ENOENT;
+				goto out;
+			}
+			hfs_bnode_put(bnode);
+			bnode = hfs_bnode_find(tree, idx);
+			if (IS_ERR(bnode)) {
+				res = PTR_ERR(bnode);
+				bnode = NULL;
+				goto out;
+			}
+		}
+		fd->record += cnt;
+	}
+
+	len = hfs_brec_lenoff(bnode, fd->record, &off);
+	keylen = hfs_brec_keylen(bnode, fd->record);
+	fd->keyoffset = off;
+	fd->keylength = keylen;
+	fd->entryoffset = off + keylen;
+	fd->entrylength = len - keylen;
+	hfs_bnode_read(bnode, fd->key, off, keylen);
+out:
+	fd->bnode = bnode;
+	return res;
+}

fs/hfsplus/bitmap.c

@@ -0,0 +1,220 @@
+/*
+ *  linux/fs/hfsplus/bitmap.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of allocation file
+ */
+
+#include <linux/pagemap.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+#define PAGE_CACHE_BITS	(PAGE_CACHE_SIZE * 8)
+
+int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset, u32 *max)
+{
+	struct page *page;
+	struct address_space *mapping;
+	__be32 *pptr, *curr, *end;
+	u32 mask, start, len, n;
+	__be32 val;
+	int i;
+
+	len = *max;
+	if (!len)
+		return size;
+
+	dprint(DBG_BITMAP, "block_allocate: %u,%u,%u\n", size, offset, len);
+	mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
+	mapping = HFSPLUS_SB(sb).alloc_file->i_mapping;
+	page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS, NULL);
+	pptr = kmap(page);
+	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
+	i = offset % 32;
+	offset &= ~(PAGE_CACHE_BITS - 1);
+	if ((size ^ offset) / PAGE_CACHE_BITS)
+		end = pptr + PAGE_CACHE_BITS / 32;
+	else
+		end = pptr + ((size + 31) & (PAGE_CACHE_BITS - 1)) / 32;
+
+	/* scan the first partial u32 for zero bits */
+	val = *curr;
+	if (~val) {
+		n = be32_to_cpu(val);
+		mask = (1U << 31) >> i;
+		for (; i < 32; mask >>= 1, i++) {
+			if (!(n & mask))
+				goto found;
+		}
+	}
+	curr++;
+
+	/* scan complete u32s for the first zero bit */
+	while (1) {
+		while (curr < end) {
+			val = *curr;
+			if (~val) {
+				n = be32_to_cpu(val);
+				mask = 1 << 31;
+				for (i = 0; i < 32; mask >>= 1, i++) {
+					if (!(n & mask))
+						goto found;
+				}
+			}
+			curr++;
+		}
+		kunmap(page);
+		offset += PAGE_CACHE_BITS;
+		if (offset >= size)
+			break;
+		page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS,
+					 NULL);
+		curr = pptr = kmap(page);
+		if ((size ^ offset) / PAGE_CACHE_BITS)
+			end = pptr + PAGE_CACHE_BITS / 32;
+		else
+			end = pptr + ((size + 31) & (PAGE_CACHE_BITS - 1)) / 32;
+	}
+	dprint(DBG_BITMAP, "bitmap full\n");
+	start = size;
+	goto out;
+
+found:
+	start = offset + (curr - pptr) * 32 + i;
+	if (start >= size) {
+		dprint(DBG_BITMAP, "bitmap full\n");
+		goto out;
+	}
+	/* do any partial u32 at the start */
+	len = min(size - start, len);
+	while (1) {
+		n |= mask;
+		if (++i >= 32)
+			break;
+		mask >>= 1;
+		if (!--len || n & mask)
+			goto done;
+	}
+	if (!--len)
+		goto done;
+	*curr++ = cpu_to_be32(n);
+	/* do full u32s */
+	while (1) {
+		while (curr < end) {
+			n = be32_to_cpu(*curr);
+			if (len < 32)
+				goto last;
+			if (n) {
+				len = 32;
+				goto last;
+			}
+			*curr++ = cpu_to_be32(0xffffffff);
+			len -= 32;
+		}
+		set_page_dirty(page);
+		kunmap(page);
+		offset += PAGE_CACHE_BITS;
+		page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS,
+					 NULL);
+		pptr = kmap(page);
+		curr = pptr;
+		end = pptr + PAGE_CACHE_BITS / 32;
+	}
+last:
+	/* do any partial u32 at end */
+	mask = 1U << 31;
+	for (i = 0; i < len; i++) {
+		if (n & mask)
+			break;
+		n |= mask;
+		mask >>= 1;
+	}
+done:
+	*curr = cpu_to_be32(n);
+	set_page_dirty(page);
+	kunmap(page);
+	*max = offset + (curr - pptr) * 32 + i - start;
+	HFSPLUS_SB(sb).free_blocks -= *max;
+	sb->s_dirt = 1;
+	dprint(DBG_BITMAP, "-> %u,%u\n", start, *max);
+out:
+	mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
+	return start;
+}
+
+int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count)
+{
+	struct page *page;
+	struct address_space *mapping;
+	__be32 *pptr, *curr, *end;
+	u32 mask, len, pnr;
+	int i;
+
+	/* is there any actual work to be done? */
+	if (!count)
+		return 0;
+
+	dprint(DBG_BITMAP, "block_free: %u,%u\n", offset, count);
+	/* are all of the bits in range? */
+	if ((offset + count) > HFSPLUS_SB(sb).total_blocks)
+		return -2;
+
+	mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
+	mapping = HFSPLUS_SB(sb).alloc_file->i_mapping;
+	pnr = offset / PAGE_CACHE_BITS;
+	page = read_mapping_page(mapping, pnr, NULL);
+	pptr = kmap(page);
+	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
+	end = pptr + PAGE_CACHE_BITS / 32;
+	len = count;
+
+	/* do any partial u32 at the start */
+	i = offset % 32;
+	if (i) {
+		int j = 32 - i;
+		mask = 0xffffffffU << j;
+		if (j > count) {
+			mask |= 0xffffffffU >> (i + count);
+			*curr++ &= cpu_to_be32(mask);
+			goto out;
+		}
+		*curr++ &= cpu_to_be32(mask);
+		count -= j;
+	}
+
+	/* do full u32s */
+	while (1) {
+		while (curr < end) {
+			if (count < 32)
+				goto done;
+			*curr++ = 0;
+			count -= 32;
+		}
+		if (!count)
+			break;
+		set_page_dirty(page);
+		kunmap(page);
+		page = read_mapping_page(mapping, ++pnr, NULL);
+		pptr = kmap(page);
+		curr = pptr;
+		end = pptr + PAGE_CACHE_BITS / 32;
+	}
+done:
+	/* do any partial u32 at end */
+	if (count) {
+		mask = 0xffffffffU >> count;
+		*curr &= cpu_to_be32(mask);
+	}
+out:
+	set_page_dirty(page);
+	kunmap(page);
+	HFSPLUS_SB(sb).free_blocks += len;
+	sb->s_dirt = 1;
+	mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
+
+	return 0;
+}

fs/hfsplus/bnode.c

@@ -0,0 +1,642 @@
+/*
+ *  linux/fs/hfsplus/bnode.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handle basic btree node operations
+ */
+
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/fs.h>
+#include <linux/swap.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+/* Copy a specified range of bytes from the raw data of a node */
+void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len)
+{
+	struct page **pagep;
+	int l;
+
+	off += node->page_offset;
+	pagep = node->page + (off >> PAGE_CACHE_SHIFT);
+	off &= ~PAGE_CACHE_MASK;
+
+	l = min(len, (int)PAGE_CACHE_SIZE - off);
+	memcpy(buf, kmap(*pagep) + off, l);
+	kunmap(*pagep);
+
+	while ((len -= l) != 0) {
+		buf += l;
+		l = min(len, (int)PAGE_CACHE_SIZE);
+		memcpy(buf, kmap(*++pagep), l);
+		kunmap(*pagep);
+	}
+}
+
+u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off)
+{
+	__be16 data;
+	// optimize later...
+	hfs_bnode_read(node, &data, off, 2);
+	return be16_to_cpu(data);
+}
+
+u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off)
+{
+	u8 data;
+	// optimize later...
+	hfs_bnode_read(node, &data, off, 1);
+	return data;
+}
+
+void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off)
+{
+	struct hfs_btree *tree;
+	int key_len;
+
+	tree = node->tree;
+	if (node->type == HFS_NODE_LEAF ||
+	    tree->attributes & HFS_TREE_VARIDXKEYS)
+		key_len = hfs_bnode_read_u16(node, off) + 2;
+	else
+		key_len = tree->max_key_len + 2;
+
+	hfs_bnode_read(node, key, off, key_len);
+}
+
+void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len)
+{
+	struct page **pagep;
+	int l;
+
+	off += node->page_offset;
+	pagep = node->page + (off >> PAGE_CACHE_SHIFT);
+	off &= ~PAGE_CACHE_MASK;
+
+	l = min(len, (int)PAGE_CACHE_SIZE - off);
+	memcpy(kmap(*pagep) + off, buf, l);
+	set_page_dirty(*pagep);
+	kunmap(*pagep);
+
+	while ((len -= l) != 0) {
+		buf += l;
+		l = min(len, (int)PAGE_CACHE_SIZE);
+		memcpy(kmap(*++pagep), buf, l);
+		set_page_dirty(*pagep);
+		kunmap(*pagep);
+	}
+}
+
+void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data)
+{
+	__be16 v = cpu_to_be16(data);
+	// optimize later...
+	hfs_bnode_write(node, &v, off, 2);
+}
+
+void hfs_bnode_clear(struct hfs_bnode *node, int off, int len)
+{
+	struct page **pagep;
+	int l;
+
+	off += node->page_offset;
+	pagep = node->page + (off >> PAGE_CACHE_SHIFT);
+	off &= ~PAGE_CACHE_MASK;
+
+	l = min(len, (int)PAGE_CACHE_SIZE - off);
+	memset(kmap(*pagep) + off, 0, l);
+	set_page_dirty(*pagep);
+	kunmap(*pagep);
+
+	while ((len -= l) != 0) {
+		l = min(len, (int)PAGE_CACHE_SIZE);
+		memset(kmap(*++pagep), 0, l);
+		set_page_dirty(*pagep);
+		kunmap(*pagep);
+	}
+}
+
+void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst,
+		    struct hfs_bnode *src_node, int src, int len)
+{
+	struct hfs_btree *tree;
+	struct page **src_page, **dst_page;
+	int l;
+
+	dprint(DBG_BNODE_MOD, "copybytes: %u,%u,%u\n", dst, src, len);
+	if (!len)
+		return;
+	tree = src_node->tree;
+	src += src_node->page_offset;
+	dst += dst_node->page_offset;
+	src_page = src_node->page + (src >> PAGE_CACHE_SHIFT);
+	src &= ~PAGE_CACHE_MASK;
+	dst_page = dst_node->page + (dst >> PAGE_CACHE_SHIFT);
+	dst &= ~PAGE_CACHE_MASK;
+
+	if (src == dst) {
+		l = min(len, (int)PAGE_CACHE_SIZE - src);
+		memcpy(kmap(*dst_page) + src, kmap(*src_page) + src, l);
+		kunmap(*src_page);
+		set_page_dirty(*dst_page);
+		kunmap(*dst_page);
+
+		while ((len -= l) != 0) {
+			l = min(len, (int)PAGE_CACHE_SIZE);
+			memcpy(kmap(*++dst_page), kmap(*++src_page), l);
+			kunmap(*src_page);
+			set_page_dirty(*dst_page);
+			kunmap(*dst_page);
+		}
+	} else {
+		void *src_ptr, *dst_ptr;
+
+		do {
+			src_ptr = kmap(*src_page) + src;
+			dst_ptr = kmap(*dst_page) + dst;
+			if (PAGE_CACHE_SIZE - src < PAGE_CACHE_SIZE - dst) {
+				l = PAGE_CACHE_SIZE - src;
+				src = 0;
+				dst += l;
+			} else {
+				l = PAGE_CACHE_SIZE - dst;
+				src += l;
+				dst = 0;
+			}
+			l = min(len, l);
+			memcpy(dst_ptr, src_ptr, l);
+			kunmap(*src_page);
+			set_page_dirty(*dst_page);
+			kunmap(*dst_page);
+			if (!dst)
+				dst_page++;
+			else
+				src_page++;
+		} while ((len -= l));
+	}
+}
+
+void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len)
+{
+	struct page **src_page, **dst_page;
+	int l;
+
+	dprint(DBG_BNODE_MOD, "movebytes: %u,%u,%u\n", dst, src, len);
+	if (!len)
+		return;
+	src += node->page_offset;
+	dst += node->page_offset;
+	if (dst > src) {
+		src += len - 1;
+		src_page = node->page + (src >> PAGE_CACHE_SHIFT);
+		src = (src & ~PAGE_CACHE_MASK) + 1;
+		dst += len - 1;
+		dst_page = node->page + (dst >> PAGE_CACHE_SHIFT);
+		dst = (dst & ~PAGE_CACHE_MASK) + 1;
+
+		if (src == dst) {
+			while (src < len) {
+				memmove(kmap(*dst_page), kmap(*src_page), src);
+				kunmap(*src_page);
+				set_page_dirty(*dst_page);
+				kunmap(*dst_page);
+				len -= src;
+				src = PAGE_CACHE_SIZE;
+				src_page--;
+				dst_page--;
+			}
+			src -= len;
+			memmove(kmap(*dst_page) + src, kmap(*src_page) + src, len);
+			kunmap(*src_page);
+			set_page_dirty(*dst_page);
+			kunmap(*dst_page);
+		} else {
+			void *src_ptr, *dst_ptr;
+
+			do {
+				src_ptr = kmap(*src_page) + src;
+				dst_ptr = kmap(*dst_page) + dst;
+				if (src < dst) {
+					l = src;
+					src = PAGE_CACHE_SIZE;
+					dst -= l;
+				} else {
+					l = dst;
+					src -= l;
+					dst = PAGE_CACHE_SIZE;
+				}
+				l = min(len, l);
+				memmove(dst_ptr - l, src_ptr - l, l);
+				kunmap(*src_page);
+				set_page_dirty(*dst_page);
+				kunmap(*dst_page);
+				if (dst == PAGE_CACHE_SIZE)
+					dst_page--;
+				else
+					src_page--;
+			} while ((len -= l));
+		}
+	} else {
+		src_page = node->page + (src >> PAGE_CACHE_SHIFT);
+		src &= ~PAGE_CACHE_MASK;
+		dst_page = node->page + (dst >> PAGE_CACHE_SHIFT);
+		dst &= ~PAGE_CACHE_MASK;
+
+		if (src == dst) {
+			l = min(len, (int)PAGE_CACHE_SIZE - src);
+			memmove(kmap(*dst_page) + src, kmap(*src_page) + src, l);
+			kunmap(*src_page);
+			set_page_dirty(*dst_page);
+			kunmap(*dst_page);
+
+			while ((len -= l) != 0) {
+				l = min(len, (int)PAGE_CACHE_SIZE);
+				memmove(kmap(*++dst_page), kmap(*++src_page), l);
+				kunmap(*src_page);
+				set_page_dirty(*dst_page);
+				kunmap(*dst_page);
+			}
+		} else {
+			void *src_ptr, *dst_ptr;
+
+			do {
+				src_ptr = kmap(*src_page) + src;
+				dst_ptr = kmap(*dst_page) + dst;
+				if (PAGE_CACHE_SIZE - src < PAGE_CACHE_SIZE - dst) {
+					l = PAGE_CACHE_SIZE - src;
+					src = 0;
+					dst += l;
+				} else {
+					l = PAGE_CACHE_SIZE - dst;
+					src += l;
+					dst = 0;
+				}
+				l = min(len, l);
+				memmove(dst_ptr, src_ptr, l);
+				kunmap(*src_page);
+				set_page_dirty(*dst_page);
+				kunmap(*dst_page);
+				if (!dst)
+					dst_page++;
+				else
+					src_page++;
+			} while ((len -= l));
+		}
+	}
+}
+
+void hfs_bnode_dump(struct hfs_bnode *node)
+{
+	struct hfs_bnode_desc desc;
+	__be32 cnid;
+	int i, off, key_off;
+
+	dprint(DBG_BNODE_MOD, "bnode: %d\n", node->this);
+	hfs_bnode_read(node, &desc, 0, sizeof(desc));
+	dprint(DBG_BNODE_MOD, "%d, %d, %d, %d, %d\n",
+		be32_to_cpu(desc.next), be32_to_cpu(desc.prev),
+		desc.type, desc.height, be16_to_cpu(desc.num_recs));
+
+	off = node->tree->node_size - 2;
+	for (i = be16_to_cpu(desc.num_recs); i >= 0; off -= 2, i--) {
+		key_off = hfs_bnode_read_u16(node, off);
+		dprint(DBG_BNODE_MOD, " %d", key_off);
+		if (i && node->type == HFS_NODE_INDEX) {
+			int tmp;
+
+			if (node->tree->attributes & HFS_TREE_VARIDXKEYS)
+				tmp = hfs_bnode_read_u16(node, key_off) + 2;
+			else
+				tmp = node->tree->max_key_len + 2;
+			dprint(DBG_BNODE_MOD, " (%d", tmp);
+			hfs_bnode_read(node, &cnid, key_off + tmp, 4);
+			dprint(DBG_BNODE_MOD, ",%d)", be32_to_cpu(cnid));
+		} else if (i && node->type == HFS_NODE_LEAF) {
+			int tmp;
+
+			tmp = hfs_bnode_read_u16(node, key_off);
+			dprint(DBG_BNODE_MOD, " (%d)", tmp);
+		}
+	}
+	dprint(DBG_BNODE_MOD, "\n");
+}
+
+void hfs_bnode_unlink(struct hfs_bnode *node)
+{
+	struct hfs_btree *tree;
+	struct hfs_bnode *tmp;
+	__be32 cnid;
+
+	tree = node->tree;
+	if (node->prev) {
+		tmp = hfs_bnode_find(tree, node->prev);
+		if (IS_ERR(tmp))
+			return;
+		tmp->next = node->next;
+		cnid = cpu_to_be32(tmp->next);
+		hfs_bnode_write(tmp, &cnid, offsetof(struct hfs_bnode_desc, next), 4);
+		hfs_bnode_put(tmp);
+	} else if (node->type == HFS_NODE_LEAF)
+		tree->leaf_head = node->next;
+
+	if (node->next) {
+		tmp = hfs_bnode_find(tree, node->next);
+		if (IS_ERR(tmp))
+			return;
+		tmp->prev = node->prev;
+		cnid = cpu_to_be32(tmp->prev);
+		hfs_bnode_write(tmp, &cnid, offsetof(struct hfs_bnode_desc, prev), 4);
+		hfs_bnode_put(tmp);
+	} else if (node->type == HFS_NODE_LEAF)
+		tree->leaf_tail = node->prev;
+
+	// move down?
+	if (!node->prev && !node->next) {
+		printk(KERN_DEBUG "hfs_btree_del_level\n");
+	}
+	if (!node->parent) {
+		tree->root = 0;
+		tree->depth = 0;
+	}
+	set_bit(HFS_BNODE_DELETED, &node->flags);
+}
+
+static inline int hfs_bnode_hash(u32 num)
+{
+	num = (num >> 16) + num;
+	num += num >> 8;
+	return num & (NODE_HASH_SIZE - 1);
+}
+
+struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid)
+{
+	struct hfs_bnode *node;
+
+	if (cnid >= tree->node_count) {
+		printk(KERN_ERR "hfs: request for non-existent node %d in B*Tree\n", cnid);
+		return NULL;
+	}
+
+	for (node = tree->node_hash[hfs_bnode_hash(cnid)];
+	     node; node = node->next_hash) {
+		if (node->this == cnid) {
+			return node;
+		}
+	}
+	return NULL;
+}
+
+static struct hfs_bnode *__hfs_bnode_create(struct hfs_btree *tree, u32 cnid)
+{
+	struct super_block *sb;
+	struct hfs_bnode *node, *node2;
+	struct address_space *mapping;
+	struct page *page;
+	int size, block, i, hash;
+	loff_t off;
+
+	if (cnid >= tree->node_count) {
+		printk(KERN_ERR "hfs: request for non-existent node %d in B*Tree\n", cnid);
+		return NULL;
+	}
+
+	sb = tree->inode->i_sb;
+	size = sizeof(struct hfs_bnode) + tree->pages_per_bnode *
+		sizeof(struct page *);
+	node = kzalloc(size, GFP_KERNEL);
+	if (!node)
+		return NULL;
+	node->tree = tree;
+	node->this = cnid;
+	set_bit(HFS_BNODE_NEW, &node->flags);
+	atomic_set(&node->refcnt, 1);
+	dprint(DBG_BNODE_REFS, "new_node(%d:%d): 1\n",
+	       node->tree->cnid, node->this);
+	init_waitqueue_head(&node->lock_wq);
+	spin_lock(&tree->hash_lock);
+	node2 = hfs_bnode_findhash(tree, cnid);
+	if (!node2) {
+		hash = hfs_bnode_hash(cnid);
+		node->next_hash = tree->node_hash[hash];
+		tree->node_hash[hash] = node;
+		tree->node_hash_cnt++;
+	} else {
+		spin_unlock(&tree->hash_lock);
+		kfree(node);
+		wait_event(node2->lock_wq, !test_bit(HFS_BNODE_NEW, &node2->flags));
+		return node2;
+	}
+	spin_unlock(&tree->hash_lock);
+
+	mapping = tree->inode->i_mapping;
+	off = (loff_t)cnid << tree->node_size_shift;
+	block = off >> PAGE_CACHE_SHIFT;
+	node->page_offset = off & ~PAGE_CACHE_MASK;
+	for (i = 0; i < tree->pages_per_bnode; block++, i++) {
+		page = read_mapping_page(mapping, block, NULL);
+		if (IS_ERR(page))
+			goto fail;
+		if (PageError(page)) {
+			page_cache_release(page);
+			goto fail;
+		}
+		page_cache_release(page);
+		node->page[i] = page;
+	}
+
+	return node;
+fail:
+	set_bit(HFS_BNODE_ERROR, &node->flags);
+	return node;
+}
+
+void hfs_bnode_unhash(struct hfs_bnode *node)
+{
+	struct hfs_bnode **p;
+
+	dprint(DBG_BNODE_REFS, "remove_node(%d:%d): %d\n",
+		node->tree->cnid, node->this, atomic_read(&node->refcnt));
+	for (p = &node->tree->node_hash[hfs_bnode_hash(node->this)];
+	     *p && *p != node; p = &(*p)->next_hash)
+		;
+	BUG_ON(!*p);
+	*p = node->next_hash;
+	node->tree->node_hash_cnt--;
+}
+
+/* Load a particular node out of a tree */
+struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num)
+{
+	struct hfs_bnode *node;
+	struct hfs_bnode_desc *desc;
+	int i, rec_off, off, next_off;
+	int entry_size, key_size;
+
+	spin_lock(&tree->hash_lock);
+	node = hfs_bnode_findhash(tree, num);
+	if (node) {
+		hfs_bnode_get(node);
+		spin_unlock(&tree->hash_lock);
+		wait_event(node->lock_wq, !test_bit(HFS_BNODE_NEW, &node->flags));
+		if (test_bit(HFS_BNODE_ERROR, &node->flags))
+			goto node_error;
+		return node;
+	}
+	spin_unlock(&tree->hash_lock);
+	node = __hfs_bnode_create(tree, num);
+	if (!node)
+		return ERR_PTR(-ENOMEM);
+	if (test_bit(HFS_BNODE_ERROR, &node->flags))
+		goto node_error;
+	if (!test_bit(HFS_BNODE_NEW, &node->flags))
+		return node;
+
+	desc = (struct hfs_bnode_desc *)(kmap(node->page[0]) + node->page_offset);
+	node->prev = be32_to_cpu(desc->prev);
+	node->next = be32_to_cpu(desc->next);
+	node->num_recs = be16_to_cpu(desc->num_recs);
+	node->type = desc->type;
+	node->height = desc->height;
+	kunmap(node->page[0]);
+
+	switch (node->type) {
+	case HFS_NODE_HEADER:
+	case HFS_NODE_MAP:
+		if (node->height != 0)
+			goto node_error;
+		break;
+	case HFS_NODE_LEAF:
+		if (node->height != 1)
+			goto node_error;
+		break;
+	case HFS_NODE_INDEX:
+		if (node->height <= 1 || node->height > tree->depth)
+			goto node_error;
+		break;
+	default:
+		goto node_error;
+	}
+
+	rec_off = tree->node_size - 2;
+	off = hfs_bnode_read_u16(node, rec_off);
+	if (off != sizeof(struct hfs_bnode_desc))
+		goto node_error;
+	for (i = 1; i <= node->num_recs; off = next_off, i++) {
+		rec_off -= 2;
+		next_off = hfs_bnode_read_u16(node, rec_off);
+		if (next_off <= off ||
+		    next_off > tree->node_size ||
+		    next_off & 1)
+			goto node_error;
+		entry_size = next_off - off;
+		if (node->type != HFS_NODE_INDEX &&
+		    node->type != HFS_NODE_LEAF)
+			continue;
+		key_size = hfs_bnode_read_u16(node, off) + 2;
+		if (key_size >= entry_size || key_size & 1)
+			goto node_error;
+	}
+	clear_bit(HFS_BNODE_NEW, &node->flags);
+	wake_up(&node->lock_wq);
+	return node;
+
+node_error:
+	set_bit(HFS_BNODE_ERROR, &node->flags);
+	clear_bit(HFS_BNODE_NEW, &node->flags);
+	wake_up(&node->lock_wq);
+	hfs_bnode_put(node);
+	return ERR_PTR(-EIO);
+}
+
+void hfs_bnode_free(struct hfs_bnode *node)
+{
+	//int i;
+
+	//for (i = 0; i < node->tree->pages_per_bnode; i++)
+	//	if (node->page[i])
+	//		page_cache_release(node->page[i]);
+	kfree(node);
+}
+
+struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num)
+{
+	struct hfs_bnode *node;
+	struct page **pagep;
+	int i;
+
+	spin_lock(&tree->hash_lock);
+	node = hfs_bnode_findhash(tree, num);
+	spin_unlock(&tree->hash_lock);
+	if (node) {
+		printk(KERN_CRIT "new node %u already hashed?\n", num);
+		WARN_ON(1);
+		return node;
+	}
+	node = __hfs_bnode_create(tree, num);
+	if (!node)
+		return ERR_PTR(-ENOMEM);
+	if (test_bit(HFS_BNODE_ERROR, &node->flags)) {
+		hfs_bnode_put(node);
+		return ERR_PTR(-EIO);
+	}
+
+	pagep = node->page;
+	memset(kmap(*pagep) + node->page_offset, 0,
+	       min((int)PAGE_CACHE_SIZE, (int)tree->node_size));
+	set_page_dirty(*pagep);
+	kunmap(*pagep);
+	for (i = 1; i < tree->pages_per_bnode; i++) {
+		memset(kmap(*++pagep), 0, PAGE_CACHE_SIZE);
+		set_page_dirty(*pagep);
+		kunmap(*pagep);
+	}
+	clear_bit(HFS_BNODE_NEW, &node->flags);
+	wake_up(&node->lock_wq);
+
+	return node;
+}
+
+void hfs_bnode_get(struct hfs_bnode *node)
+{
+	if (node) {
+		atomic_inc(&node->refcnt);
+		dprint(DBG_BNODE_REFS, "get_node(%d:%d): %d\n",
+		       node->tree->cnid, node->this, atomic_read(&node->refcnt));
+	}
+}
+
+/* Dispose of resources used by a node */
+void hfs_bnode_put(struct hfs_bnode *node)
+{
+	if (node) {
+		struct hfs_btree *tree = node->tree;
+		int i;
+
+		dprint(DBG_BNODE_REFS, "put_node(%d:%d): %d\n",
+		       node->tree->cnid, node->this, atomic_read(&node->refcnt));
+		BUG_ON(!atomic_read(&node->refcnt));
+		if (!atomic_dec_and_lock(&node->refcnt, &tree->hash_lock))
+			return;
+		for (i = 0; i < tree->pages_per_bnode; i++) {
+			if (!node->page[i])
+				continue;
+			mark_page_accessed(node->page[i]);
+		}
+
+		if (test_bit(HFS_BNODE_DELETED, &node->flags)) {
+			hfs_bnode_unhash(node);
+			spin_unlock(&tree->hash_lock);
+			hfs_bmap_free(node);
+			hfs_bnode_free(node);
+			return;
+		}
+		spin_unlock(&tree->hash_lock);
+	}
+}
+

fs/hfsplus/brec.c

@@ -0,0 +1,491 @@
+/*
+ *  linux/fs/hfsplus/brec.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handle individual btree records
+ */
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+static struct hfs_bnode *hfs_bnode_split(struct hfs_find_data *fd);
+static int hfs_brec_update_parent(struct hfs_find_data *fd);
+static int hfs_btree_inc_height(struct hfs_btree *);
+
+/* Get the length and offset of the given record in the given node */
+u16 hfs_brec_lenoff(struct hfs_bnode *node, u16 rec, u16 *off)
+{
+	__be16 retval[2];
+	u16 dataoff;
+
+	dataoff = node->tree->node_size - (rec + 2) * 2;
+	hfs_bnode_read(node, retval, dataoff, 4);
+	*off = be16_to_cpu(retval[1]);
+	return be16_to_cpu(retval[0]) - *off;
+}
+
+/* Get the length of the key from a keyed record */
+u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec)
+{
+	u16 retval, recoff;
+
+	if (node->type != HFS_NODE_INDEX && node->type != HFS_NODE_LEAF)
+		return 0;
+
+	if ((node->type == HFS_NODE_INDEX) &&
+	   !(node->tree->attributes & HFS_TREE_VARIDXKEYS)) {
+		retval = node->tree->max_key_len + 2;
+	} else {
+		recoff = hfs_bnode_read_u16(node, node->tree->node_size - (rec + 1) * 2);
+		if (!recoff)
+			return 0;
+		if (node->tree->attributes & HFS_TREE_BIGKEYS)
+			retval = hfs_bnode_read_u16(node, recoff) + 2;
+		else
+			retval = (hfs_bnode_read_u8(node, recoff) | 1) + 1;
+	}
+	return retval;
+}
+
+int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len)
+{
+	struct hfs_btree *tree;
+	struct hfs_bnode *node, *new_node;
+	int size, key_len, rec;
+	int data_off, end_off;
+	int idx_rec_off, data_rec_off, end_rec_off;
+	__be32 cnid;
+
+	tree = fd->tree;
+	if (!fd->bnode) {
+		if (!tree->root)
+			hfs_btree_inc_height(tree);
+		fd->bnode = hfs_bnode_find(tree, tree->leaf_head);
+		if (IS_ERR(fd->bnode))
+			return PTR_ERR(fd->bnode);
+		fd->record = -1;
+	}
+	new_node = NULL;
+	key_len = be16_to_cpu(fd->search_key->key_len) + 2;
+again:
+	/* new record idx and complete record size */
+	rec = fd->record + 1;
+	size = key_len + entry_len;
+
+	node = fd->bnode;
+	hfs_bnode_dump(node);
+	/* get last offset */
+	end_rec_off = tree->node_size - (node->num_recs + 1) * 2;
+	end_off = hfs_bnode_read_u16(node, end_rec_off);
+	end_rec_off -= 2;
+	dprint(DBG_BNODE_MOD, "insert_rec: %d, %d, %d, %d\n", rec, size, end_off, end_rec_off);
+	if (size > end_rec_off - end_off) {
+		if (new_node)
+			panic("not enough room!\n");
+		new_node = hfs_bnode_split(fd);
+		if (IS_ERR(new_node))
+			return PTR_ERR(new_node);
+		goto again;
+	}
+	if (node->type == HFS_NODE_LEAF) {
+		tree->leaf_count++;
+		mark_inode_dirty(tree->inode);
+	}
+	node->num_recs++;
+	/* write new last offset */
+	hfs_bnode_write_u16(node, offsetof(struct hfs_bnode_desc, num_recs), node->num_recs);
+	hfs_bnode_write_u16(node, end_rec_off, end_off + size);
+	data_off = end_off;
+	data_rec_off = end_rec_off + 2;
+	idx_rec_off = tree->node_size - (rec + 1) * 2;
+	if (idx_rec_off == data_rec_off)
+		goto skip;
+	/* move all following entries */
+	do {
+		data_off = hfs_bnode_read_u16(node, data_rec_off + 2);
+		hfs_bnode_write_u16(node, data_rec_off, data_off + size);
+		data_rec_off += 2;
+	} while (data_rec_off < idx_rec_off);
+
+	/* move data away */
+	hfs_bnode_move(node, data_off + size, data_off,
+		       end_off - data_off);
+
+skip:
+	hfs_bnode_write(node, fd->search_key, data_off, key_len);
+	hfs_bnode_write(node, entry, data_off + key_len, entry_len);
+	hfs_bnode_dump(node);
+
+	if (new_node) {
+		/* update parent key if we inserted a key
+		 * at the start of the first node
+		 */
+		if (!rec && new_node != node)
+			hfs_brec_update_parent(fd);
+
+		hfs_bnode_put(fd->bnode);
+		if (!new_node->parent) {
+			hfs_btree_inc_height(tree);
+			new_node->parent = tree->root;
+		}
+		fd->bnode = hfs_bnode_find(tree, new_node->parent);
+
+		/* create index data entry */
+		cnid = cpu_to_be32(new_node->this);
+		entry = &cnid;
+		entry_len = sizeof(cnid);
+
+		/* get index key */
+		hfs_bnode_read_key(new_node, fd->search_key, 14);
+		__hfs_brec_find(fd->bnode, fd);
+
+		hfs_bnode_put(new_node);
+		new_node = NULL;
+
+		if (tree->attributes & HFS_TREE_VARIDXKEYS)
+			key_len = be16_to_cpu(fd->search_key->key_len) + 2;
+		else {
+			fd->search_key->key_len = cpu_to_be16(tree->max_key_len);
+			key_len = tree->max_key_len + 2;
+		}
+		goto again;
+	}
+
+	if (!rec)
+		hfs_brec_update_parent(fd);
+
+	return 0;
+}
+
+int hfs_brec_remove(struct hfs_find_data *fd)
+{
+	struct hfs_btree *tree;
+	struct hfs_bnode *node, *parent;
+	int end_off, rec_off, data_off, size;
+
+	tree = fd->tree;
+	node = fd->bnode;
+again:
+	rec_off = tree->node_size - (fd->record + 2) * 2;
+	end_off = tree->node_size - (node->num_recs + 1) * 2;
+
+	if (node->type == HFS_NODE_LEAF) {
+		tree->leaf_count--;
+		mark_inode_dirty(tree->inode);
+	}
+	hfs_bnode_dump(node);
+	dprint(DBG_BNODE_MOD, "remove_rec: %d, %d\n", fd->record, fd->keylength + fd->entrylength);
+	if (!--node->num_recs) {
+		hfs_bnode_unlink(node);
+		if (!node->parent)
+			return 0;
+		parent = hfs_bnode_find(tree, node->parent);
+		if (IS_ERR(parent))
+			return PTR_ERR(parent);
+		hfs_bnode_put(node);
+		node = fd->bnode = parent;
+
+		__hfs_brec_find(node, fd);
+		goto again;
+	}
+	hfs_bnode_write_u16(node, offsetof(struct hfs_bnode_desc, num_recs), node->num_recs);
+
+	if (rec_off == end_off)
+		goto skip;
+	size = fd->keylength + fd->entrylength;
+
+	do {
+		data_off = hfs_bnode_read_u16(node, rec_off);
+		hfs_bnode_write_u16(node, rec_off + 2, data_off - size);
+		rec_off -= 2;
+	} while (rec_off >= end_off);
+
+	/* fill hole */
+	hfs_bnode_move(node, fd->keyoffset, fd->keyoffset + size,
+		       data_off - fd->keyoffset - size);
+skip:
+	hfs_bnode_dump(node);
+	if (!fd->record)
+		hfs_brec_update_parent(fd);
+	return 0;
+}
+
+static struct hfs_bnode *hfs_bnode_split(struct hfs_find_data *fd)
+{
+	struct hfs_btree *tree;
+	struct hfs_bnode *node, *new_node;
+	struct hfs_bnode_desc node_desc;
+	int num_recs, new_rec_off, new_off, old_rec_off;
+	int data_start, data_end, size;
+
+	tree = fd->tree;
+	node = fd->bnode;
+	new_node = hfs_bmap_alloc(tree);
+	if (IS_ERR(new_node))
+		return new_node;
+	hfs_bnode_get(node);
+	dprint(DBG_BNODE_MOD, "split_nodes: %d - %d - %d\n",
+		node->this, new_node->this, node->next);
+	new_node->next = node->next;
+	new_node->prev = node->this;
+	new_node->parent = node->parent;
+	new_node->type = node->type;
+	new_node->height = node->height;
+
+	size = tree->node_size / 2 - node->num_recs * 2 - 14;
+	old_rec_off = tree->node_size - 4;
+	num_recs = 1;
+	for (;;) {
+		data_start = hfs_bnode_read_u16(node, old_rec_off);
+		if (data_start > size)
+			break;
+		old_rec_off -= 2;
+		if (++num_recs < node->num_recs)
+			continue;
+		/* panic? */
+		hfs_bnode_put(node);
+		hfs_bnode_put(new_node);
+		return ERR_PTR(-ENOSPC);
+	}
+
+	if (fd->record + 1 < num_recs) {
+		/* new record is in the lower half,
+		 * so leave some more space there
+		 */
+		old_rec_off += 2;
+		num_recs--;
+		data_start = hfs_bnode_read_u16(node, old_rec_off);
+	} else {
+		hfs_bnode_put(node);
+		hfs_bnode_get(new_node);
+		fd->bnode = new_node;
+		fd->record -= num_recs;
+		fd->keyoffset -= data_start - 14;
+		fd->entryoffset -= data_start - 14;
+	}
+	new_node->num_recs = node->num_recs - num_recs;
+	node->num_recs = num_recs;
+
+	new_rec_off = tree->node_size - 2;
+	new_off = 14;
+	size = data_start - new_off;
+	num_recs = new_node->num_recs;
+	data_end = data_start;
+	while (num_recs) {
+		hfs_bnode_write_u16(new_node, new_rec_off, new_off);
+		old_rec_off -= 2;
+		new_rec_off -= 2;
+		data_end = hfs_bnode_read_u16(node, old_rec_off);
+		new_off = data_end - size;
+		num_recs--;
+	}
+	hfs_bnode_write_u16(new_node, new_rec_off, new_off);
+	hfs_bnode_copy(new_node, 14, node, data_start, data_end - data_start);
+
+	/* update new bnode header */
+	node_desc.next = cpu_to_be32(new_node->next);
+	node_desc.prev = cpu_to_be32(new_node->prev);
+	node_desc.type = new_node->type;
+	node_desc.height = new_node->height;
+	node_desc.num_recs = cpu_to_be16(new_node->num_recs);
+	node_desc.reserved = 0;
+	hfs_bnode_write(new_node, &node_desc, 0, sizeof(node_desc));
+
+	/* update previous bnode header */
+	node->next = new_node->this;
+	hfs_bnode_read(node, &node_desc, 0, sizeof(node_desc));
+	node_desc.next = cpu_to_be32(node->next);
+	node_desc.num_recs = cpu_to_be16(node->num_recs);
+	hfs_bnode_write(node, &node_desc, 0, sizeof(node_desc));
+
+	/* update next bnode header */
+	if (new_node->next) {
+		struct hfs_bnode *next_node = hfs_bnode_find(tree, new_node->next);
+		next_node->prev = new_node->this;
+		hfs_bnode_read(next_node, &node_desc, 0, sizeof(node_desc));
+		node_desc.prev = cpu_to_be32(next_node->prev);
+		hfs_bnode_write(next_node, &node_desc, 0, sizeof(node_desc));
+		hfs_bnode_put(next_node);
+	} else if (node->this == tree->leaf_tail) {
+		/* if there is no next node, this might be the new tail */
+		tree->leaf_tail = new_node->this;
+		mark_inode_dirty(tree->inode);
+	}
+
+	hfs_bnode_dump(node);
+	hfs_bnode_dump(new_node);
+	hfs_bnode_put(node);
+
+	return new_node;
+}
+
+static int hfs_brec_update_parent(struct hfs_find_data *fd)
+{
+	struct hfs_btree *tree;
+	struct hfs_bnode *node, *new_node, *parent;
+	int newkeylen, diff;
+	int rec, rec_off, end_rec_off;
+	int start_off, end_off;
+
+	tree = fd->tree;
+	node = fd->bnode;
+	new_node = NULL;
+	if (!node->parent)
+		return 0;
+
+again:
+	parent = hfs_bnode_find(tree, node->parent);
+	if (IS_ERR(parent))
+		return PTR_ERR(parent);
+	__hfs_brec_find(parent, fd);
+	hfs_bnode_dump(parent);
+	rec = fd->record;
+
+	/* size difference between old and new key */
+	if (tree->attributes & HFS_TREE_VARIDXKEYS)
+		newkeylen = hfs_bnode_read_u16(node, 14) + 2;
+	else
+		fd->keylength = newkeylen = tree->max_key_len + 2;
+	dprint(DBG_BNODE_MOD, "update_rec: %d, %d, %d\n", rec, fd->keylength, newkeylen);
+
+	rec_off = tree->node_size - (rec + 2) * 2;
+	end_rec_off = tree->node_size - (parent->num_recs + 1) * 2;
+	diff = newkeylen - fd->keylength;
+	if (!diff)
+		goto skip;
+	if (diff > 0) {
+		end_off = hfs_bnode_read_u16(parent, end_rec_off);
+		if (end_rec_off - end_off < diff) {
+
+			printk(KERN_DEBUG "hfs: splitting index node...\n");
+			fd->bnode = parent;
+			new_node = hfs_bnode_split(fd);
+			if (IS_ERR(new_node))
+				return PTR_ERR(new_node);
+			parent = fd->bnode;
+			rec = fd->record;
+			rec_off = tree->node_size - (rec + 2) * 2;
+			end_rec_off = tree->node_size - (parent->num_recs + 1) * 2;
+		}
+	}
+
+	end_off = start_off = hfs_bnode_read_u16(parent, rec_off);
+	hfs_bnode_write_u16(parent, rec_off, start_off + diff);
+	start_off -= 4;	/* move previous cnid too */
+
+	while (rec_off > end_rec_off) {
+		rec_off -= 2;
+		end_off = hfs_bnode_read_u16(parent, rec_off);
+		hfs_bnode_write_u16(parent, rec_off, end_off + diff);
+	}
+	hfs_bnode_move(parent, start_off + diff, start_off,
+		       end_off - start_off);
+skip:
+	hfs_bnode_copy(parent, fd->keyoffset, node, 14, newkeylen);
+	hfs_bnode_dump(parent);
+
+	hfs_bnode_put(node);
+	node = parent;
+
+	if (new_node) {
+		__be32 cnid;
+
+		fd->bnode = hfs_bnode_find(tree, new_node->parent);
+		/* create index key and entry */
+		hfs_bnode_read_key(new_node, fd->search_key, 14);
+		cnid = cpu_to_be32(new_node->this);
+
+		__hfs_brec_find(fd->bnode, fd);
+		hfs_brec_insert(fd, &cnid, sizeof(cnid));
+		hfs_bnode_put(fd->bnode);
+		hfs_bnode_put(new_node);
+
+		if (!rec) {
+			if (new_node == node)
+				goto out;
+			/* restore search_key */
+			hfs_bnode_read_key(node, fd->search_key, 14);
+		}
+	}
+
+	if (!rec && node->parent)
+		goto again;
+out:
+	fd->bnode = node;
+	return 0;
+}
+
+static int hfs_btree_inc_height(struct hfs_btree *tree)
+{
+	struct hfs_bnode *node, *new_node;
+	struct hfs_bnode_desc node_desc;
+	int key_size, rec;
+	__be32 cnid;
+
+	node = NULL;
+	if (tree->root) {
+		node = hfs_bnode_find(tree, tree->root);
+		if (IS_ERR(node))
+			return PTR_ERR(node);
+	}
+	new_node = hfs_bmap_alloc(tree);
+	if (IS_ERR(new_node)) {
+		hfs_bnode_put(node);
+		return PTR_ERR(new_node);
+	}
+
+	tree->root = new_node->this;
+	if (!tree->depth) {
+		tree->leaf_head = tree->leaf_tail = new_node->this;
+		new_node->type = HFS_NODE_LEAF;
+		new_node->num_recs = 0;
+	} else {
+		new_node->type = HFS_NODE_INDEX;
+		new_node->num_recs = 1;
+	}
+	new_node->parent = 0;
+	new_node->next = 0;
+	new_node->prev = 0;
+	new_node->height = ++tree->depth;
+
+	node_desc.next = cpu_to_be32(new_node->next);
+	node_desc.prev = cpu_to_be32(new_node->prev);
+	node_desc.type = new_node->type;
+	node_desc.height = new_node->height;
+	node_desc.num_recs = cpu_to_be16(new_node->num_recs);
+	node_desc.reserved = 0;
+	hfs_bnode_write(new_node, &node_desc, 0, sizeof(node_desc));
+
+	rec = tree->node_size - 2;
+	hfs_bnode_write_u16(new_node, rec, 14);
+
+	if (node) {
+		/* insert old root idx into new root */
+		node->parent = tree->root;
+		if (node->type == HFS_NODE_LEAF ||
+		    tree->attributes & HFS_TREE_VARIDXKEYS)
+			key_size = hfs_bnode_read_u16(node, 14) + 2;
+		else
+			key_size = tree->max_key_len + 2;
+		hfs_bnode_copy(new_node, 14, node, 14, key_size);
+
+		if (!(tree->attributes & HFS_TREE_VARIDXKEYS)) {
+			key_size = tree->max_key_len + 2;
+			hfs_bnode_write_u16(new_node, 14, tree->max_key_len);
+		}
+		cnid = cpu_to_be32(node->this);
+		hfs_bnode_write(new_node, &cnid, 14 + key_size, 4);
+
+		rec -= 2;
+		hfs_bnode_write_u16(new_node, rec, 14 + key_size + 4);
+
+		hfs_bnode_put(node);
+	}
+	hfs_bnode_put(new_node);
+	mark_inode_dirty(tree->inode);
+
+	return 0;
+}

fs/hfsplus/btree.c

@@ -0,0 +1,318 @@
+/*
+ *  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 "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+
+/* 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 page *page;
+	unsigned int size;
+
+	tree = kzalloc(sizeof(*tree), GFP_KERNEL);
+	if (!tree)
+		return NULL;
+
+	init_MUTEX(&tree->tree_lock);
+	spin_lock_init(&tree->hash_lock);
+	tree->sb = sb;
+	tree->cnid = id;
+	tree->inode = iget(sb, id);
+	if (!tree->inode)
+		goto free_tree;
+
+	mapping = tree->inode->i_mapping;
+	page = read_mapping_page(mapping, 0, NULL);
+	if (IS_ERR(page))
+		goto free_tree;
+
+	/* Load the header */
+	head = (struct hfs_btree_header_rec *)(kmap(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);
+
+	/* Set the correct compare function */
+	if (id == HFSPLUS_EXT_CNID) {
+		tree->keycmp = hfsplus_ext_cmp_key;
+	} else if (id == HFSPLUS_CAT_CNID) {
+		if ((HFSPLUS_SB(sb).flags & HFSPLUS_SB_HFSX) &&
+		    (head->key_type == HFSPLUS_KEY_BINARY))
+			tree->keycmp = hfsplus_cat_bin_cmp_key;
+		else
+			tree->keycmp = hfsplus_cat_case_cmp_key;
+	} else {
+		printk(KERN_ERR "hfs: unknown B*Tree requested\n");
+		goto fail_page;
+	}
+
+	size = tree->node_size;
+	if (!size || size & (size - 1))
+		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_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+
+	kunmap(page);
+	page_cache_release(page);
+	return tree;
+
+ fail_page:
+	tree->inode->i_mapping->a_ops = &hfsplus_aops;
+	page_cache_release(page);
+ free_tree:
+	iput(tree->inode);
+	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))
+				printk(KERN_CRIT "hfs: 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);
+}
+
+void 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;
+	/* Load the header */
+	page = node->page[0];
+	head = (struct hfs_btree_header_rec *)(kmap(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(page);
+	set_page_dirty(page);
+	hfs_bnode_put(node);
+}
+
+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;
+}
+
+struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *tree)
+{
+	struct hfs_bnode *node, *next_node;
+	struct page **pagep;
+	u32 nidx, idx;
+	u16 off, len;
+	u8 *data, byte, m;
+	int i;
+
+	while (!tree->free_nodes) {
+		struct inode *inode = tree->inode;
+		u32 count;
+		int res;
+
+		res = hfsplus_file_extend(inode);
+		if (res)
+			return ERR_PTR(res);
+		HFSPLUS_I(inode).phys_size = inode->i_size =
+				(loff_t)HFSPLUS_I(inode).alloc_blocks <<
+				HFSPLUS_SB(tree->sb).alloc_blksz_shift;
+		HFSPLUS_I(inode).fs_blocks = HFSPLUS_I(inode).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;
+	}
+
+	nidx = 0;
+	node = hfs_bnode_find(tree, nidx);
+	if (IS_ERR(node))
+		return node;
+	len = hfs_brec_lenoff(node, 2, &off);
+
+	off += node->page_offset;
+	pagep = node->page + (off >> PAGE_CACHE_SHIFT);
+	data = kmap(*pagep);
+	off &= ~PAGE_CACHE_MASK;
+	idx = 0;
+
+	for (;;) {
+		while (len) {
+			byte = data[off];
+			if (byte != 0xff) {
+				for (m = 0x80, i = 0; i < 8; m >>= 1, i++) {
+					if (!(byte & m)) {
+						idx += i;
+						data[off] |= m;
+						set_page_dirty(*pagep);
+						kunmap(*pagep);
+						tree->free_nodes--;
+						mark_inode_dirty(tree->inode);
+						hfs_bnode_put(node);
+						return hfs_bnode_create(tree, idx);
+					}
+				}
+			}
+			if (++off >= PAGE_CACHE_SIZE) {
+				kunmap(*pagep);
+				data = kmap(*++pagep);
+				off = 0;
+			}
+			idx += 8;
+			len--;
+		}
+		kunmap(*pagep);
+		nidx = node->next;
+		if (!nidx) {
+			printk(KERN_DEBUG "hfs: create new bmap node...\n");
+			next_node = hfs_bmap_new_bmap(node, idx);
+		} else
+			next_node = hfs_bnode_find(tree, nidx);
+		hfs_bnode_put(node);
+		if (IS_ERR(next_node))
+			return next_node;
+		node = next_node;
+
+		len = hfs_brec_lenoff(node, 0, &off);
+		off += node->page_offset;
+		pagep = node->page + (off >> PAGE_CACHE_SHIFT);
+		data = kmap(*pagep);
+		off &= ~PAGE_CACHE_MASK;
+	}
+}
+
+void hfs_bmap_free(struct hfs_bnode *node)
+{
+	struct hfs_btree *tree;
+	struct page *page;
+	u16 off, len;
+	u32 nidx;
+	u8 *data, byte, m;
+
+	dprint(DBG_BNODE_MOD, "btree_free_node: %u\n", node->this);
+	BUG_ON(!node->this);
+	tree = node->tree;
+	nidx = node->this;
+	node = hfs_bnode_find(tree, 0);
+	if (IS_ERR(node))
+		return;
+	len = hfs_brec_lenoff(node, 2, &off);
+	while (nidx >= len * 8) {
+		u32 i;
+
+		nidx -= len * 8;
+		i = node->next;
+		hfs_bnode_put(node);
+		if (!i) {
+			/* panic */;
+			printk(KERN_CRIT "hfs: unable to free bnode %u. bmap not found!\n", node->this);
+			return;
+		}
+		node = hfs_bnode_find(tree, i);
+		if (IS_ERR(node))
+			return;
+		if (node->type != HFS_NODE_MAP) {
+			/* panic */;
+			printk(KERN_CRIT "hfs: invalid bmap found! (%u,%d)\n", node->this, node->type);
+			hfs_bnode_put(node);
+			return;
+		}
+		len = hfs_brec_lenoff(node, 0, &off);
+	}
+	off += node->page_offset + nidx / 8;
+	page = node->page[off >> PAGE_CACHE_SHIFT];
+	data = kmap(page);
+	off &= ~PAGE_CACHE_MASK;
+	m = 1 << (~nidx & 7);
+	byte = data[off];
+	if (!(byte & m)) {
+		printk(KERN_CRIT "hfs: trying to free free bnode %u(%d)\n", node->this, node->type);
+		kunmap(page);
+		hfs_bnode_put(node);
+		return;
+	}
+	data[off] = byte & ~m;
+	set_page_dirty(page);
+	kunmap(page);
+	hfs_bnode_put(node);
+	tree->free_nodes++;
+	mark_inode_dirty(tree->inode);
+}

fs/hfsplus/catalog.c

@@ -0,0 +1,383 @@
+/*
+ *  linux/fs/hfsplus/catalog.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of catalog records
+ */
+
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
+			     const hfsplus_btree_key *k2)
+{
+	__be32 k1p, k2p;
+
+	k1p = k1->cat.parent;
+	k2p = k2->cat.parent;
+	if (k1p != k2p)
+		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
+
+	return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
+}
+
+int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
+			    const hfsplus_btree_key *k2)
+{
+	__be32 k1p, k2p;
+
+	k1p = k1->cat.parent;
+	k2p = k2->cat.parent;
+	if (k1p != k2p)
+		return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
+
+	return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
+}
+
+void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
+			   u32 parent, struct qstr *str)
+{
+	int len;
+
+	key->cat.parent = cpu_to_be32(parent);
+	if (str) {
+		hfsplus_asc2uni(sb, &key->cat.name, str->name, str->len);
+		len = be16_to_cpu(key->cat.name.length);
+	} else {
+		key->cat.name.length = 0;
+		len = 0;
+	}
+	key->key_len = cpu_to_be16(6 + 2 * len);
+}
+
+static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
+				      struct hfsplus_unistr *name)
+{
+	int ustrlen;
+
+	ustrlen = be16_to_cpu(name->length);
+	key->cat.parent = cpu_to_be32(parent);
+	key->cat.name.length = cpu_to_be16(ustrlen);
+	ustrlen *= 2;
+	memcpy(key->cat.name.unicode, name->unicode, ustrlen);
+	key->key_len = cpu_to_be16(6 + ustrlen);
+}
+
+static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
+{
+	if (inode->i_flags & S_IMMUTABLE)
+		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
+	else
+		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
+	if (inode->i_flags & S_APPEND)
+		perms->rootflags |= HFSPLUS_FLG_APPEND;
+	else
+		perms->rootflags &= ~HFSPLUS_FLG_APPEND;
+	HFSPLUS_I(inode).rootflags = perms->rootflags;
+	HFSPLUS_I(inode).userflags = perms->userflags;
+	perms->mode = cpu_to_be16(inode->i_mode);
+	perms->owner = cpu_to_be32(inode->i_uid);
+	perms->group = cpu_to_be32(inode->i_gid);
+}
+
+static int hfsplus_cat_build_record(hfsplus_cat_entry *entry, u32 cnid, struct inode *inode)
+{
+	if (S_ISDIR(inode->i_mode)) {
+		struct hfsplus_cat_folder *folder;
+
+		folder = &entry->folder;
+		memset(folder, 0, sizeof(*folder));
+		folder->type = cpu_to_be16(HFSPLUS_FOLDER);
+		folder->id = cpu_to_be32(inode->i_ino);
+		HFSPLUS_I(inode).create_date =
+			folder->create_date =
+			folder->content_mod_date =
+			folder->attribute_mod_date =
+			folder->access_date = hfsp_now2mt();
+		hfsplus_set_perms(inode, &folder->permissions);
+		if (inode == HFSPLUS_SB(inode->i_sb).hidden_dir)
+			/* invisible and namelocked */
+			folder->user_info.frFlags = cpu_to_be16(0x5000);
+		return sizeof(*folder);
+	} else {
+		struct hfsplus_cat_file *file;
+
+		file = &entry->file;
+		memset(file, 0, sizeof(*file));
+		file->type = cpu_to_be16(HFSPLUS_FILE);
+		file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
+		file->id = cpu_to_be32(cnid);
+		HFSPLUS_I(inode).create_date =
+			file->create_date =
+			file->content_mod_date =
+			file->attribute_mod_date =
+			file->access_date = hfsp_now2mt();
+		if (cnid == inode->i_ino) {
+			hfsplus_set_perms(inode, &file->permissions);
+			if (S_ISLNK(inode->i_mode)) {
+				file->user_info.fdType = cpu_to_be32(HFSP_SYMLINK_TYPE);
+				file->user_info.fdCreator = cpu_to_be32(HFSP_SYMLINK_CREATOR);
+			} else {
+				file->user_info.fdType = cpu_to_be32(HFSPLUS_SB(inode->i_sb).type);
+				file->user_info.fdCreator = cpu_to_be32(HFSPLUS_SB(inode->i_sb).creator);
+			}
+			if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
+				file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
+		} else {
+			file->user_info.fdType = cpu_to_be32(HFSP_HARDLINK_TYPE);
+			file->user_info.fdCreator = cpu_to_be32(HFSP_HFSPLUS_CREATOR);
+			file->user_info.fdFlags = cpu_to_be16(0x100);
+			file->create_date = HFSPLUS_I(HFSPLUS_SB(inode->i_sb).hidden_dir).create_date;
+			file->permissions.dev = cpu_to_be32(HFSPLUS_I(inode).dev);
+		}
+		return sizeof(*file);
+	}
+}
+
+static int hfsplus_fill_cat_thread(struct super_block *sb,
+				   hfsplus_cat_entry *entry, int type,
+				   u32 parentid, struct qstr *str)
+{
+	entry->type = cpu_to_be16(type);
+	entry->thread.reserved = 0;
+	entry->thread.parentID = cpu_to_be32(parentid);
+	hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
+	return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
+}
+
+/* Try to get a catalog entry for given catalog id */
+int hfsplus_find_cat(struct super_block *sb, u32 cnid,
+		     struct hfs_find_data *fd)
+{
+	hfsplus_cat_entry tmp;
+	int err;
+	u16 type;
+
+	hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
+	err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
+	if (err)
+		return err;
+
+	type = be16_to_cpu(tmp.type);
+	if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
+		printk(KERN_ERR "hfs: found bad thread record in catalog\n");
+		return -EIO;
+	}
+
+	hfsplus_cat_build_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
+				 &tmp.thread.nodeName);
+	return hfs_brec_find(fd);
+}
+
+int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
+{
+	struct hfs_find_data fd;
+	struct super_block *sb;
+	hfsplus_cat_entry entry;
+	int entry_size;
+	int err;
+
+	dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
+	sb = dir->i_sb;
+	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+
+	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+	entry_size = hfsplus_fill_cat_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
+			HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
+			dir->i_ino, str);
+	err = hfs_brec_find(&fd);
+	if (err != -ENOENT) {
+		if (!err)
+			err = -EEXIST;
+		goto err2;
+	}
+	err = hfs_brec_insert(&fd, &entry, entry_size);
+	if (err)
+		goto err2;
+
+	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+	entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
+	err = hfs_brec_find(&fd);
+	if (err != -ENOENT) {
+		/* panic? */
+		if (!err)
+			err = -EEXIST;
+		goto err1;
+	}
+	err = hfs_brec_insert(&fd, &entry, entry_size);
+	if (err)
+		goto err1;
+
+	dir->i_size++;
+	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dir);
+	hfs_find_exit(&fd);
+	return 0;
+
+err1:
+	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+	if (!hfs_brec_find(&fd))
+		hfs_brec_remove(&fd);
+err2:
+	hfs_find_exit(&fd);
+	return err;
+}
+
+int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
+{
+	struct super_block *sb;
+	struct hfs_find_data fd;
+	struct hfsplus_fork_raw fork;
+	struct list_head *pos;
+	int err, off;
+	u16 type;
+
+	dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
+	sb = dir->i_sb;
+	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+
+	if (!str) {
+		int len;
+
+		hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+		err = hfs_brec_find(&fd);
+		if (err)
+			goto out;
+
+		off = fd.entryoffset + offsetof(struct hfsplus_cat_thread, nodeName);
+		fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
+		hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.length, off, 2);
+		len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
+		hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.unicode, off + 2, len);
+		fd.search_key->key_len = cpu_to_be16(6 + len);
+	} else
+		hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+
+	err = hfs_brec_find(&fd);
+	if (err)
+		goto out;
+
+	type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
+	if (type == HFSPLUS_FILE) {
+#if 0
+		off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
+		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
+		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
+#endif
+
+		off = fd.entryoffset + offsetof(struct hfsplus_cat_file, rsrc_fork);
+		hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
+		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
+	}
+
+	list_for_each(pos, &HFSPLUS_I(dir).open_dir_list) {
+		struct hfsplus_readdir_data *rd =
+			list_entry(pos, struct hfsplus_readdir_data, list);
+		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
+			rd->file->f_pos--;
+	}
+
+	err = hfs_brec_remove(&fd);
+	if (err)
+		goto out;
+
+	hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+	err = hfs_brec_find(&fd);
+	if (err)
+		goto out;
+
+	err = hfs_brec_remove(&fd);
+	if (err)
+		goto out;
+
+	dir->i_size--;
+	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dir);
+out:
+	hfs_find_exit(&fd);
+
+	return err;
+}
+
+int hfsplus_rename_cat(u32 cnid,
+		       struct inode *src_dir, struct qstr *src_name,
+		       struct inode *dst_dir, struct qstr *dst_name)
+{
+	struct super_block *sb;
+	struct hfs_find_data src_fd, dst_fd;
+	hfsplus_cat_entry entry;
+	int entry_size, type;
+	int err = 0;
+
+	dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
+		dst_dir->i_ino, dst_name->name);
+	sb = src_dir->i_sb;
+	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
+	dst_fd = src_fd;
+
+	/* find the old dir entry and read the data */
+	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
+	err = hfs_brec_find(&src_fd);
+	if (err)
+		goto out;
+
+	hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
+				src_fd.entrylength);
+
+	/* create new dir entry with the data from the old entry */
+	hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
+	err = hfs_brec_find(&dst_fd);
+	if (err != -ENOENT) {
+		if (!err)
+			err = -EEXIST;
+		goto out;
+	}
+
+	err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
+	if (err)
+		goto out;
+	dst_dir->i_size++;
+	dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dst_dir);
+
+	/* finally remove the old entry */
+	hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
+	err = hfs_brec_find(&src_fd);
+	if (err)
+		goto out;
+	err = hfs_brec_remove(&src_fd);
+	if (err)
+		goto out;
+	src_dir->i_size--;
+	src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(src_dir);
+
+	/* remove old thread entry */
+	hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
+	err = hfs_brec_find(&src_fd);
+	if (err)
+		goto out;
+	type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
+	err = hfs_brec_remove(&src_fd);
+	if (err)
+		goto out;
+
+	/* create new thread entry */
+	hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
+	entry_size = hfsplus_fill_cat_thread(sb, &entry, type, dst_dir->i_ino, dst_name);
+	err = hfs_brec_find(&dst_fd);
+	if (err != -ENOENT) {
+		if (!err)
+			err = -EEXIST;
+		goto out;
+	}
+	err = hfs_brec_insert(&dst_fd, &entry, entry_size);
+out:
+	hfs_bnode_put(dst_fd.bnode);
+	hfs_find_exit(&src_fd);
+	return err;
+}

fs/hfsplus/dir.c

@@ -0,0 +1,491 @@
+/*
+ *  linux/fs/hfsplus/dir.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of directories
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+static inline void hfsplus_instantiate(struct dentry *dentry,
+				       struct inode *inode, u32 cnid)
+{
+	dentry->d_fsdata = (void *)(unsigned long)cnid;
+	d_instantiate(dentry, inode);
+}
+
+/* Find the entry inside dir named dentry->d_name */
+static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
+				     struct nameidata *nd)
+{
+	struct inode *inode = NULL;
+	struct hfs_find_data fd;
+	struct super_block *sb;
+	hfsplus_cat_entry entry;
+	int err;
+	u32 cnid, linkid = 0;
+	u16 type;
+
+	sb = dir->i_sb;
+	dentry->d_fsdata = NULL;
+	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
+again:
+	err = hfs_brec_read(&fd, &entry, sizeof(entry));
+	if (err) {
+		if (err == -ENOENT) {
+			hfs_find_exit(&fd);
+			/* No such entry */
+			inode = NULL;
+			goto out;
+		}
+		goto fail;
+	}
+	type = be16_to_cpu(entry.type);
+	if (type == HFSPLUS_FOLDER) {
+		if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
+			err = -EIO;
+			goto fail;
+		}
+		cnid = be32_to_cpu(entry.folder.id);
+		dentry->d_fsdata = (void *)(unsigned long)cnid;
+	} else if (type == HFSPLUS_FILE) {
+		if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
+			err = -EIO;
+			goto fail;
+		}
+		cnid = be32_to_cpu(entry.file.id);
+		if (entry.file.user_info.fdType == cpu_to_be32(HFSP_HARDLINK_TYPE) &&
+		    entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
+		    (entry.file.create_date == HFSPLUS_I(HFSPLUS_SB(sb).hidden_dir).create_date ||
+		     entry.file.create_date == HFSPLUS_I(sb->s_root->d_inode).create_date) &&
+		    HFSPLUS_SB(sb).hidden_dir) {
+			struct qstr str;
+			char name[32];
+
+			if (dentry->d_fsdata) {
+				/*
+				 * We found a link pointing to another link,
+				 * so ignore it and treat it as regular file.
+				 */
+				cnid = (unsigned long)dentry->d_fsdata;
+				linkid = 0;
+			} else {
+				dentry->d_fsdata = (void *)(unsigned long)cnid;
+				linkid = be32_to_cpu(entry.file.permissions.dev);
+				str.len = sprintf(name, "iNode%d", linkid);
+				str.name = name;
+				hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_SB(sb).hidden_dir->i_ino, &str);
+				goto again;
+			}
+		} else if (!dentry->d_fsdata)
+			dentry->d_fsdata = (void *)(unsigned long)cnid;
+	} else {
+		printk(KERN_ERR "hfs: invalid catalog entry type in lookup\n");
+		err = -EIO;
+		goto fail;
+	}
+	hfs_find_exit(&fd);
+	inode = iget(dir->i_sb, cnid);
+	if (!inode)
+		return ERR_PTR(-EACCES);
+	if (S_ISREG(inode->i_mode))
+		HFSPLUS_I(inode).dev = linkid;
+out:
+	d_add(dentry, inode);
+	return NULL;
+fail:
+	hfs_find_exit(&fd);
+	return ERR_PTR(err);
+}
+
+static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct super_block *sb = inode->i_sb;
+	int len, err;
+	char strbuf[HFSPLUS_MAX_STRLEN + 1];
+	hfsplus_cat_entry entry;
+	struct hfs_find_data fd;
+	struct hfsplus_readdir_data *rd;
+	u16 type;
+
+	if (filp->f_pos >= inode->i_size)
+		return 0;
+
+	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+	hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
+	err = hfs_brec_find(&fd);
+	if (err)
+		goto out;
+
+	switch ((u32)filp->f_pos) {
+	case 0:
+		/* This is completely artificial... */
+		if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
+			goto out;
+		filp->f_pos++;
+		/* fall through */
+	case 1:
+		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+		if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
+			printk(KERN_ERR "hfs: bad catalog folder thread\n");
+			err = -EIO;
+			goto out;
+		}
+		if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
+			printk(KERN_ERR "hfs: truncated catalog thread\n");
+			err = -EIO;
+			goto out;
+		}
+		if (filldir(dirent, "..", 2, 1,
+			    be32_to_cpu(entry.thread.parentID), DT_DIR))
+			goto out;
+		filp->f_pos++;
+		/* fall through */
+	default:
+		if (filp->f_pos >= inode->i_size)
+			goto out;
+		err = hfs_brec_goto(&fd, filp->f_pos - 1);
+		if (err)
+			goto out;
+	}
+
+	for (;;) {
+		if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
+			printk(KERN_ERR "hfs: walked past end of dir\n");
+			err = -EIO;
+			goto out;
+		}
+		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+		type = be16_to_cpu(entry.type);
+		len = HFSPLUS_MAX_STRLEN;
+		err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
+		if (err)
+			goto out;
+		if (type == HFSPLUS_FOLDER) {
+			if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
+				printk(KERN_ERR "hfs: small dir entry\n");
+				err = -EIO;
+				goto out;
+			}
+			if (HFSPLUS_SB(sb).hidden_dir &&
+			    HFSPLUS_SB(sb).hidden_dir->i_ino == be32_to_cpu(entry.folder.id))
+				goto next;
+			if (filldir(dirent, strbuf, len, filp->f_pos,
+				    be32_to_cpu(entry.folder.id), DT_DIR))
+				break;
+		} else if (type == HFSPLUS_FILE) {
+			if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
+				printk(KERN_ERR "hfs: small file entry\n");
+				err = -EIO;
+				goto out;
+			}
+			if (filldir(dirent, strbuf, len, filp->f_pos,
+				    be32_to_cpu(entry.file.id), DT_REG))
+				break;
+		} else {
+			printk(KERN_ERR "hfs: bad catalog entry type\n");
+			err = -EIO;
+			goto out;
+		}
+	next:
+		filp->f_pos++;
+		if (filp->f_pos >= inode->i_size)
+			goto out;
+		err = hfs_brec_goto(&fd, 1);
+		if (err)
+			goto out;
+	}
+	rd = filp->private_data;
+	if (!rd) {
+		rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
+		if (!rd) {
+			err = -ENOMEM;
+			goto out;
+		}
+		filp->private_data = rd;
+		rd->file = filp;
+		list_add(&rd->list, &HFSPLUS_I(inode).open_dir_list);
+	}
+	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
+out:
+	hfs_find_exit(&fd);
+	return err;
+}
+
+static int hfsplus_dir_release(struct inode *inode, struct file *file)
+{
+	struct hfsplus_readdir_data *rd = file->private_data;
+	if (rd) {
+		list_del(&rd->list);
+		kfree(rd);
+	}
+	return 0;
+}
+
+static int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode,
+			  struct nameidata *nd)
+{
+	struct inode *inode;
+	int res;
+
+	inode = hfsplus_new_inode(dir->i_sb, mode);
+	if (!inode)
+		return -ENOSPC;
+
+	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+	if (res) {
+		inode->i_nlink = 0;
+		hfsplus_delete_inode(inode);
+		iput(inode);
+		return res;
+	}
+	hfsplus_instantiate(dentry, inode, inode->i_ino);
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
+			struct dentry *dst_dentry)
+{
+	struct super_block *sb = dst_dir->i_sb;
+	struct inode *inode = src_dentry->d_inode;
+	struct inode *src_dir = src_dentry->d_parent->d_inode;
+	struct qstr str;
+	char name[32];
+	u32 cnid, id;
+	int res;
+
+	if (HFSPLUS_IS_RSRC(inode))
+		return -EPERM;
+
+	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
+		for (;;) {
+			get_random_bytes(&id, sizeof(cnid));
+			id &= 0x3fffffff;
+			str.name = name;
+			str.len = sprintf(name, "iNode%d", id);
+			res = hfsplus_rename_cat(inode->i_ino,
+						 src_dir, &src_dentry->d_name,
+						 HFSPLUS_SB(sb).hidden_dir, &str);
+			if (!res)
+				break;
+			if (res != -EEXIST)
+				return res;
+		}
+		HFSPLUS_I(inode).dev = id;
+		cnid = HFSPLUS_SB(sb).next_cnid++;
+		src_dentry->d_fsdata = (void *)(unsigned long)cnid;
+		res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode);
+		if (res)
+			/* panic? */
+			return res;
+		HFSPLUS_SB(sb).file_count++;
+	}
+	cnid = HFSPLUS_SB(sb).next_cnid++;
+	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
+	if (res)
+		return res;
+
+	inc_nlink(inode);
+	hfsplus_instantiate(dst_dentry, inode, cnid);
+	atomic_inc(&inode->i_count);
+	inode->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+	HFSPLUS_SB(sb).file_count++;
+	sb->s_dirt = 1;
+
+	return 0;
+}
+
+static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode = dentry->d_inode;
+	struct qstr str;
+	char name[32];
+	u32 cnid;
+	int res;
+
+	if (HFSPLUS_IS_RSRC(inode))
+		return -EPERM;
+
+	cnid = (u32)(unsigned long)dentry->d_fsdata;
+	if (inode->i_ino == cnid &&
+	    atomic_read(&HFSPLUS_I(inode).opencnt)) {
+		str.name = name;
+		str.len = sprintf(name, "temp%lu", inode->i_ino);
+		res = hfsplus_rename_cat(inode->i_ino,
+					 dir, &dentry->d_name,
+					 HFSPLUS_SB(sb).hidden_dir, &str);
+		if (!res)
+			inode->i_flags |= S_DEAD;
+		return res;
+	}
+	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
+	if (res)
+		return res;
+
+	if (inode->i_nlink > 0)
+		drop_nlink(inode);
+	hfsplus_delete_inode(inode);
+	if (inode->i_ino != cnid && !inode->i_nlink) {
+		if (!atomic_read(&HFSPLUS_I(inode).opencnt)) {
+			res = hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
+			if (!res)
+				hfsplus_delete_inode(inode);
+		} else
+			inode->i_flags |= S_DEAD;
+	} else
+		clear_nlink(inode);
+	inode->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+
+	return res;
+}
+
+static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	struct inode *inode;
+	int res;
+
+	inode = hfsplus_new_inode(dir->i_sb, S_IFDIR | mode);
+	if (!inode)
+		return -ENOSPC;
+
+	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+	if (res) {
+		inode->i_nlink = 0;
+		hfsplus_delete_inode(inode);
+		iput(inode);
+		return res;
+	}
+	hfsplus_instantiate(dentry, inode, inode->i_ino);
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode;
+	int res;
+
+	inode = dentry->d_inode;
+	if (inode->i_size != 2)
+		return -ENOTEMPTY;
+	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
+	if (res)
+		return res;
+	clear_nlink(inode);
+	inode->i_ctime = CURRENT_TIME_SEC;
+	hfsplus_delete_inode(inode);
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
+			   const char *symname)
+{
+	struct super_block *sb;
+	struct inode *inode;
+	int res;
+
+	sb = dir->i_sb;
+	inode = hfsplus_new_inode(sb, S_IFLNK | S_IRWXUGO);
+	if (!inode)
+		return -ENOSPC;
+
+	res = page_symlink(inode, symname, strlen(symname) + 1);
+	if (res) {
+		inode->i_nlink = 0;
+		hfsplus_delete_inode(inode);
+		iput(inode);
+		return res;
+	}
+
+	mark_inode_dirty(inode);
+	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+
+	if (!res) {
+		hfsplus_instantiate(dentry, inode, inode->i_ino);
+		mark_inode_dirty(inode);
+	}
+
+	return res;
+}
+
+static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
+			 int mode, dev_t rdev)
+{
+	struct super_block *sb;
+	struct inode *inode;
+	int res;
+
+	sb = dir->i_sb;
+	inode = hfsplus_new_inode(sb, mode);
+	if (!inode)
+		return -ENOSPC;
+
+	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+	if (res) {
+		inode->i_nlink = 0;
+		hfsplus_delete_inode(inode);
+		iput(inode);
+		return res;
+	}
+	init_special_inode(inode, mode, rdev);
+	hfsplus_instantiate(dentry, inode, inode->i_ino);
+	mark_inode_dirty(inode);
+
+	return 0;
+}
+
+static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
+			  struct inode *new_dir, struct dentry *new_dentry)
+{
+	int res;
+
+	/* Unlink destination if it already exists */
+	if (new_dentry->d_inode) {
+		res = hfsplus_unlink(new_dir, new_dentry);
+		if (res)
+			return res;
+	}
+
+	res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
+				 old_dir, &old_dentry->d_name,
+				 new_dir, &new_dentry->d_name);
+	if (!res)
+		new_dentry->d_fsdata = old_dentry->d_fsdata;
+	return res;
+}
+
+const struct inode_operations hfsplus_dir_inode_operations = {
+	.lookup		= hfsplus_lookup,
+	.create		= hfsplus_create,
+	.link		= hfsplus_link,
+	.unlink		= hfsplus_unlink,
+	.mkdir		= hfsplus_mkdir,
+	.rmdir		= hfsplus_rmdir,
+	.symlink	= hfsplus_symlink,
+	.mknod		= hfsplus_mknod,
+	.rename		= hfsplus_rename,
+};
+
+const struct file_operations hfsplus_dir_operations = {
+	.read		= generic_read_dir,
+	.readdir	= hfsplus_readdir,
+	.ioctl          = hfsplus_ioctl,
+	.llseek		= generic_file_llseek,
+	.release	= hfsplus_dir_release,
+};

fs/hfsplus/extents.c

@@ -0,0 +1,506 @@
+/*
+ *  linux/fs/hfsplus/extents.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of Extents both in catalog and extents overflow trees
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+/* Compare two extents keys, returns 0 on same, pos/neg for difference */
+int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1,
+			const hfsplus_btree_key *k2)
+{
+	__be32 k1id, k2id;
+	__be32 k1s, k2s;
+
+	k1id = k1->ext.cnid;
+	k2id = k2->ext.cnid;
+	if (k1id != k2id)
+		return be32_to_cpu(k1id) < be32_to_cpu(k2id) ? -1 : 1;
+
+	if (k1->ext.fork_type != k2->ext.fork_type)
+		return k1->ext.fork_type < k2->ext.fork_type ? -1 : 1;
+
+	k1s = k1->ext.start_block;
+	k2s = k2->ext.start_block;
+	if (k1s == k2s)
+		return 0;
+	return be32_to_cpu(k1s) < be32_to_cpu(k2s) ? -1 : 1;
+}
+
+static void hfsplus_ext_build_key(hfsplus_btree_key *key, u32 cnid,
+				  u32 block, u8 type)
+{
+	key->key_len = cpu_to_be16(HFSPLUS_EXT_KEYLEN - 2);
+	key->ext.cnid = cpu_to_be32(cnid);
+	key->ext.start_block = cpu_to_be32(block);
+	key->ext.fork_type = type;
+	key->ext.pad = 0;
+}
+
+static u32 hfsplus_ext_find_block(struct hfsplus_extent *ext, u32 off)
+{
+	int i;
+	u32 count;
+
+	for (i = 0; i < 8; ext++, i++) {
+		count = be32_to_cpu(ext->block_count);
+		if (off < count)
+			return be32_to_cpu(ext->start_block) + off;
+		off -= count;
+	}
+	/* panic? */
+	return 0;
+}
+
+static int hfsplus_ext_block_count(struct hfsplus_extent *ext)
+{
+	int i;
+	u32 count = 0;
+
+	for (i = 0; i < 8; ext++, i++)
+		count += be32_to_cpu(ext->block_count);
+	return count;
+}
+
+static u32 hfsplus_ext_lastblock(struct hfsplus_extent *ext)
+{
+	int i;
+
+	ext += 7;
+	for (i = 0; i < 7; ext--, i++)
+		if (ext->block_count)
+			break;
+	return be32_to_cpu(ext->start_block) + be32_to_cpu(ext->block_count);
+}
+
+static void __hfsplus_ext_write_extent(struct inode *inode, struct hfs_find_data *fd)
+{
+	int res;
+
+	hfsplus_ext_build_key(fd->search_key, inode->i_ino, HFSPLUS_I(inode).cached_start,
+			      HFSPLUS_IS_RSRC(inode) ?  HFSPLUS_TYPE_RSRC : HFSPLUS_TYPE_DATA);
+	res = hfs_brec_find(fd);
+	if (HFSPLUS_I(inode).flags & HFSPLUS_FLG_EXT_NEW) {
+		if (res != -ENOENT)
+			return;
+		hfs_brec_insert(fd, HFSPLUS_I(inode).cached_extents, sizeof(hfsplus_extent_rec));
+		HFSPLUS_I(inode).flags &= ~(HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW);
+	} else {
+		if (res)
+			return;
+		hfs_bnode_write(fd->bnode, HFSPLUS_I(inode).cached_extents, fd->entryoffset, fd->entrylength);
+		HFSPLUS_I(inode).flags &= ~HFSPLUS_FLG_EXT_DIRTY;
+	}
+}
+
+void hfsplus_ext_write_extent(struct inode *inode)
+{
+	if (HFSPLUS_I(inode).flags & HFSPLUS_FLG_EXT_DIRTY) {
+		struct hfs_find_data fd;
+
+		hfs_find_init(HFSPLUS_SB(inode->i_sb).ext_tree, &fd);
+		__hfsplus_ext_write_extent(inode, &fd);
+		hfs_find_exit(&fd);
+	}
+}
+
+static inline int __hfsplus_ext_read_extent(struct hfs_find_data *fd,
+					    struct hfsplus_extent *extent,
+					    u32 cnid, u32 block, u8 type)
+{
+	int res;
+
+	hfsplus_ext_build_key(fd->search_key, cnid, block, type);
+	fd->key->ext.cnid = 0;
+	res = hfs_brec_find(fd);
+	if (res && res != -ENOENT)
+		return res;
+	if (fd->key->ext.cnid != fd->search_key->ext.cnid ||
+	    fd->key->ext.fork_type != fd->search_key->ext.fork_type)
+		return -ENOENT;
+	if (fd->entrylength != sizeof(hfsplus_extent_rec))
+		return -EIO;
+	hfs_bnode_read(fd->bnode, extent, fd->entryoffset, sizeof(hfsplus_extent_rec));
+	return 0;
+}
+
+static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd, struct inode *inode, u32 block)
+{
+	int res;
+
+	if (HFSPLUS_I(inode).flags & HFSPLUS_FLG_EXT_DIRTY)
+		__hfsplus_ext_write_extent(inode, fd);
+
+	res = __hfsplus_ext_read_extent(fd, HFSPLUS_I(inode).cached_extents, inode->i_ino,
+					block, HFSPLUS_IS_RSRC(inode) ? HFSPLUS_TYPE_RSRC : HFSPLUS_TYPE_DATA);
+	if (!res) {
+		HFSPLUS_I(inode).cached_start = be32_to_cpu(fd->key->ext.start_block);
+		HFSPLUS_I(inode).cached_blocks = hfsplus_ext_block_count(HFSPLUS_I(inode).cached_extents);
+	} else {
+		HFSPLUS_I(inode).cached_start = HFSPLUS_I(inode).cached_blocks = 0;
+		HFSPLUS_I(inode).flags &= ~(HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW);
+	}
+	return res;
+}
+
+static int hfsplus_ext_read_extent(struct inode *inode, u32 block)
+{
+	struct hfs_find_data fd;
+	int res;
+
+	if (block >= HFSPLUS_I(inode).cached_start &&
+	    block < HFSPLUS_I(inode).cached_start + HFSPLUS_I(inode).cached_blocks)
+		return 0;
+
+	hfs_find_init(HFSPLUS_SB(inode->i_sb).ext_tree, &fd);
+	res = __hfsplus_ext_cache_extent(&fd, inode, block);
+	hfs_find_exit(&fd);
+	return res;
+}
+
+/* Get a block at iblock for inode, possibly allocating if create */
+int hfsplus_get_block(struct inode *inode, sector_t iblock,
+		      struct buffer_head *bh_result, int create)
+{
+	struct super_block *sb;
+	int res = -EIO;
+	u32 ablock, dblock, mask;
+	int shift;
+
+	sb = inode->i_sb;
+
+	/* Convert inode block to disk allocation block */
+	shift = HFSPLUS_SB(sb).alloc_blksz_shift - sb->s_blocksize_bits;
+	ablock = iblock >> HFSPLUS_SB(sb).fs_shift;
+
+	if (iblock >= HFSPLUS_I(inode).fs_blocks) {
+		if (iblock > HFSPLUS_I(inode).fs_blocks || !create)
+			return -EIO;
+		if (ablock >= HFSPLUS_I(inode).alloc_blocks) {
+			res = hfsplus_file_extend(inode);
+			if (res)
+				return res;
+		}
+	} else
+		create = 0;
+
+	if (ablock < HFSPLUS_I(inode).first_blocks) {
+		dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).first_extents, ablock);
+		goto done;
+	}
+
+	down(&HFSPLUS_I(inode).extents_lock);
+	res = hfsplus_ext_read_extent(inode, ablock);
+	if (!res) {
+		dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).cached_extents, ablock -
+					     HFSPLUS_I(inode).cached_start);
+	} else {
+		up(&HFSPLUS_I(inode).extents_lock);
+		return -EIO;
+	}
+	up(&HFSPLUS_I(inode).extents_lock);
+
+done:
+	dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n", inode->i_ino, (long long)iblock, dblock);
+	mask = (1 << HFSPLUS_SB(sb).fs_shift) - 1;
+	map_bh(bh_result, sb, (dblock << HFSPLUS_SB(sb).fs_shift) + HFSPLUS_SB(sb).blockoffset + (iblock & mask));
+	if (create) {
+		set_buffer_new(bh_result);
+		HFSPLUS_I(inode).phys_size += sb->s_blocksize;
+		HFSPLUS_I(inode).fs_blocks++;
+		inode_add_bytes(inode, sb->s_blocksize);
+		mark_inode_dirty(inode);
+	}
+	return 0;
+}
+
+static void hfsplus_dump_extent(struct hfsplus_extent *extent)
+{
+	int i;
+
+	dprint(DBG_EXTENT, "   ");
+	for (i = 0; i < 8; i++)
+		dprint(DBG_EXTENT, " %u:%u", be32_to_cpu(extent[i].start_block),
+				 be32_to_cpu(extent[i].block_count));
+	dprint(DBG_EXTENT, "\n");
+}
+
+static int hfsplus_add_extent(struct hfsplus_extent *extent, u32 offset,
+			      u32 alloc_block, u32 block_count)
+{
+	u32 count, start;
+	int i;
+
+	hfsplus_dump_extent(extent);
+	for (i = 0; i < 8; extent++, i++) {
+		count = be32_to_cpu(extent->block_count);
+		if (offset == count) {
+			start = be32_to_cpu(extent->start_block);
+			if (alloc_block != start + count) {
+				if (++i >= 8)
+					return -ENOSPC;
+				extent++;
+				extent->start_block = cpu_to_be32(alloc_block);
+			} else
+				block_count += count;
+			extent->block_count = cpu_to_be32(block_count);
+			return 0;
+		} else if (offset < count)
+			break;
+		offset -= count;
+	}
+	/* panic? */
+	return -EIO;
+}
+
+static int hfsplus_free_extents(struct super_block *sb,
+				struct hfsplus_extent *extent,
+				u32 offset, u32 block_nr)
+{
+	u32 count, start;
+	int i;
+
+	hfsplus_dump_extent(extent);
+	for (i = 0; i < 8; extent++, i++) {
+		count = be32_to_cpu(extent->block_count);
+		if (offset == count)
+			goto found;
+		else if (offset < count)
+			break;
+		offset -= count;
+	}
+	/* panic? */
+	return -EIO;
+found:
+	for (;;) {
+		start = be32_to_cpu(extent->start_block);
+		if (count <= block_nr) {
+			hfsplus_block_free(sb, start, count);
+			extent->block_count = 0;
+			extent->start_block = 0;
+			block_nr -= count;
+		} else {
+			count -= block_nr;
+			hfsplus_block_free(sb, start + count, block_nr);
+			extent->block_count = cpu_to_be32(count);
+			block_nr = 0;
+		}
+		if (!block_nr || !i)
+			return 0;
+		i--;
+		extent--;
+		count = be32_to_cpu(extent->block_count);
+	}
+}
+
+int hfsplus_free_fork(struct super_block *sb, u32 cnid, struct hfsplus_fork_raw *fork, int type)
+{
+	struct hfs_find_data fd;
+	hfsplus_extent_rec ext_entry;
+	u32 total_blocks, blocks, start;
+	int res, i;
+
+	total_blocks = be32_to_cpu(fork->total_blocks);
+	if (!total_blocks)
+		return 0;
+
+	blocks = 0;
+	for (i = 0; i < 8; i++)
+		blocks += be32_to_cpu(fork->extents[i].block_count);
+
+	res = hfsplus_free_extents(sb, fork->extents, blocks, blocks);
+	if (res)
+		return res;
+	if (total_blocks == blocks)
+		return 0;
+
+	hfs_find_init(HFSPLUS_SB(sb).ext_tree, &fd);
+	do {
+		res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid,
+						total_blocks, type);
+		if (res)
+			break;
+		start = be32_to_cpu(fd.key->ext.start_block);
+		hfsplus_free_extents(sb, ext_entry,
+				     total_blocks - start,
+				     total_blocks);
+		hfs_brec_remove(&fd);
+		total_blocks = start;
+	} while (total_blocks > blocks);
+	hfs_find_exit(&fd);
+
+	return res;
+}
+
+int hfsplus_file_extend(struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+	u32 start, len, goal;
+	int res;
+
+	if (HFSPLUS_SB(sb).alloc_file->i_size * 8 < HFSPLUS_SB(sb).total_blocks - HFSPLUS_SB(sb).free_blocks + 8) {
+		// extend alloc file
+		printk(KERN_ERR "hfs: extend alloc file! (%Lu,%u,%u)\n", HFSPLUS_SB(sb).alloc_file->i_size * 8,
+			HFSPLUS_SB(sb).total_blocks, HFSPLUS_SB(sb).free_blocks);
+		return -ENOSPC;
+	}
+
+	down(&HFSPLUS_I(inode).extents_lock);
+	if (HFSPLUS_I(inode).alloc_blocks == HFSPLUS_I(inode).first_blocks)
+		goal = hfsplus_ext_lastblock(HFSPLUS_I(inode).first_extents);
+	else {
+		res = hfsplus_ext_read_extent(inode, HFSPLUS_I(inode).alloc_blocks);
+		if (res)
+			goto out;
+		goal = hfsplus_ext_lastblock(HFSPLUS_I(inode).cached_extents);
+	}
+
+	len = HFSPLUS_I(inode).clump_blocks;
+	start = hfsplus_block_allocate(sb, HFSPLUS_SB(sb).total_blocks, goal, &len);
+	if (start >= HFSPLUS_SB(sb).total_blocks) {
+		start = hfsplus_block_allocate(sb, goal, 0, &len);
+		if (start >= goal) {
+			res = -ENOSPC;
+			goto out;
+		}
+	}
+
+	dprint(DBG_EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len);
+	if (HFSPLUS_I(inode).alloc_blocks <= HFSPLUS_I(inode).first_blocks) {
+		if (!HFSPLUS_I(inode).first_blocks) {
+			dprint(DBG_EXTENT, "first extents\n");
+			/* no extents yet */
+			HFSPLUS_I(inode).first_extents[0].start_block = cpu_to_be32(start);
+			HFSPLUS_I(inode).first_extents[0].block_count = cpu_to_be32(len);
+			res = 0;
+		} else {
+			/* try to append to extents in inode */
+			res = hfsplus_add_extent(HFSPLUS_I(inode).first_extents,
+						 HFSPLUS_I(inode).alloc_blocks,
+						 start, len);
+			if (res == -ENOSPC)
+				goto insert_extent;
+		}
+		if (!res) {
+			hfsplus_dump_extent(HFSPLUS_I(inode).first_extents);
+			HFSPLUS_I(inode).first_blocks += len;
+		}
+	} else {
+		res = hfsplus_add_extent(HFSPLUS_I(inode).cached_extents,
+					 HFSPLUS_I(inode).alloc_blocks -
+					 HFSPLUS_I(inode).cached_start,
+					 start, len);
+		if (!res) {
+			hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
+			HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY;
+			HFSPLUS_I(inode).cached_blocks += len;
+		} else if (res == -ENOSPC)
+			goto insert_extent;
+	}
+out:
+	up(&HFSPLUS_I(inode).extents_lock);
+	if (!res) {
+		HFSPLUS_I(inode).alloc_blocks += len;
+		mark_inode_dirty(inode);
+	}
+	return res;
+
+insert_extent:
+	dprint(DBG_EXTENT, "insert new extent\n");
+	hfsplus_ext_write_extent(inode);
+
+	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
+	HFSPLUS_I(inode).cached_extents[0].start_block = cpu_to_be32(start);
+	HFSPLUS_I(inode).cached_extents[0].block_count = cpu_to_be32(len);
+	hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
+	HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW;
+	HFSPLUS_I(inode).cached_start = HFSPLUS_I(inode).alloc_blocks;
+	HFSPLUS_I(inode).cached_blocks = len;
+
+	res = 0;
+	goto out;
+}
+
+void hfsplus_file_truncate(struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+	struct hfs_find_data fd;
+	u32 alloc_cnt, blk_cnt, start;
+	int res;
+
+	dprint(DBG_INODE, "truncate: %lu, %Lu -> %Lu\n", inode->i_ino,
+	       (long long)HFSPLUS_I(inode).phys_size, inode->i_size);
+	if (inode->i_size > HFSPLUS_I(inode).phys_size) {
+		struct address_space *mapping = inode->i_mapping;
+		struct page *page;
+		u32 size = inode->i_size - 1;
+		int res;
+
+		page = grab_cache_page(mapping, size >> PAGE_CACHE_SHIFT);
+		if (!page)
+			return;
+		size &= PAGE_CACHE_SIZE - 1;
+		size++;
+		res = mapping->a_ops->prepare_write(NULL, page, size, size);
+		if (!res)
+			res = mapping->a_ops->commit_write(NULL, page, size, size);
+		if (res)
+			inode->i_size = HFSPLUS_I(inode).phys_size;
+		unlock_page(page);
+		page_cache_release(page);
+		mark_inode_dirty(inode);
+		return;
+	} else if (inode->i_size == HFSPLUS_I(inode).phys_size)
+		return;
+
+	blk_cnt = (inode->i_size + HFSPLUS_SB(sb).alloc_blksz - 1) >> HFSPLUS_SB(sb).alloc_blksz_shift;
+	alloc_cnt = HFSPLUS_I(inode).alloc_blocks;
+	if (blk_cnt == alloc_cnt)
+		goto out;
+
+	down(&HFSPLUS_I(inode).extents_lock);
+	hfs_find_init(HFSPLUS_SB(sb).ext_tree, &fd);
+	while (1) {
+		if (alloc_cnt == HFSPLUS_I(inode).first_blocks) {
+			hfsplus_free_extents(sb, HFSPLUS_I(inode).first_extents,
+					     alloc_cnt, alloc_cnt - blk_cnt);
+			hfsplus_dump_extent(HFSPLUS_I(inode).first_extents);
+			HFSPLUS_I(inode).first_blocks = blk_cnt;
+			break;
+		}
+		res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt);
+		if (res)
+			break;
+		start = HFSPLUS_I(inode).cached_start;
+		hfsplus_free_extents(sb, HFSPLUS_I(inode).cached_extents,
+				     alloc_cnt - start, alloc_cnt - blk_cnt);
+		hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
+		if (blk_cnt > start) {
+			HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY;
+			break;
+		}
+		alloc_cnt = start;
+		HFSPLUS_I(inode).cached_start = HFSPLUS_I(inode).cached_blocks = 0;
+		HFSPLUS_I(inode).flags &= ~(HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW);
+		hfs_brec_remove(&fd);
+	}
+	hfs_find_exit(&fd);
+	up(&HFSPLUS_I(inode).extents_lock);
+
+	HFSPLUS_I(inode).alloc_blocks = blk_cnt;
+out:
+	HFSPLUS_I(inode).phys_size = inode->i_size;
+	HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
+	inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
+	mark_inode_dirty(inode);
+}

fs/hfsplus/hfsplus_fs.h

@@ -0,0 +1,412 @@
+/*
+ *  linux/include/linux/hfsplus_fs.h
+ *
+ * Copyright (C) 1999
+ * Brad Boyer (flar@pants.nu)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ */
+
+#ifndef _LINUX_HFSPLUS_FS_H
+#define _LINUX_HFSPLUS_FS_H
+
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include "hfsplus_raw.h"
+
+#define DBG_BNODE_REFS	0x00000001
+#define DBG_BNODE_MOD	0x00000002
+#define DBG_CAT_MOD	0x00000004
+#define DBG_INODE	0x00000008
+#define DBG_SUPER	0x00000010
+#define DBG_EXTENT	0x00000020
+#define DBG_BITMAP	0x00000040
+
+//#define DBG_MASK	(DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD)
+//#define DBG_MASK	(DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
+//#define DBG_MASK	(DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
+#define DBG_MASK	(0)
+
+#define dprint(flg, fmt, args...) \
+	if (flg & DBG_MASK) printk(fmt , ## args)
+
+/* Runtime config options */
+#define HFSPLUS_DEF_CR_TYPE    0x3F3F3F3F  /* '????' */
+
+#define HFSPLUS_TYPE_DATA 0x00
+#define HFSPLUS_TYPE_RSRC 0xFF
+
+typedef int (*btree_keycmp)(const hfsplus_btree_key *, const hfsplus_btree_key *);
+
+#define NODE_HASH_SIZE	256
+
+/* An HFS+ BTree held in memory */
+struct hfs_btree {
+	struct super_block *sb;
+	struct inode *inode;
+	btree_keycmp keycmp;
+
+	u32 cnid;
+	u32 root;
+	u32 leaf_count;
+	u32 leaf_head;
+	u32 leaf_tail;
+	u32 node_count;
+	u32 free_nodes;
+	u32 attributes;
+
+	unsigned int node_size;
+	unsigned int node_size_shift;
+	unsigned int max_key_len;
+	unsigned int depth;
+
+	//unsigned int map1_size, map_size;
+	struct semaphore tree_lock;
+
+	unsigned int pages_per_bnode;
+	spinlock_t hash_lock;
+	struct hfs_bnode *node_hash[NODE_HASH_SIZE];
+	int node_hash_cnt;
+};
+
+struct page;
+
+/* An HFS+ BTree node in memory */
+struct hfs_bnode {
+	struct hfs_btree *tree;
+
+	u32 prev;
+	u32 this;
+	u32 next;
+	u32 parent;
+
+	u16 num_recs;
+	u8 type;
+	u8 height;
+
+	struct hfs_bnode *next_hash;
+	unsigned long flags;
+	wait_queue_head_t lock_wq;
+	atomic_t refcnt;
+	unsigned int page_offset;
+	struct page *page[0];
+};
+
+#define HFS_BNODE_LOCK		0
+#define HFS_BNODE_ERROR		1
+#define HFS_BNODE_NEW		2
+#define HFS_BNODE_DIRTY		3
+#define HFS_BNODE_DELETED	4
+
+/*
+ * HFS+ superblock info (built from Volume Header on disk)
+ */
+
+struct hfsplus_vh;
+struct hfs_btree;
+
+struct hfsplus_sb_info {
+	struct buffer_head *s_vhbh;
+	struct hfsplus_vh *s_vhdr;
+	struct hfs_btree *ext_tree;
+	struct hfs_btree *cat_tree;
+	struct hfs_btree *attr_tree;
+	struct inode *alloc_file;
+	struct inode *hidden_dir;
+	struct nls_table *nls;
+
+	/* Runtime variables */
+	u32 blockoffset;
+	u32 sect_count;
+	int fs_shift;
+
+	/* Stuff in host order from Vol Header */
+	u32 alloc_blksz;
+	int alloc_blksz_shift;
+	u32 total_blocks;
+	u32 free_blocks;
+	u32 next_alloc;
+	u32 next_cnid;
+	u32 file_count;
+	u32 folder_count;
+	u32 data_clump_blocks, rsrc_clump_blocks;
+
+	/* Config options */
+	u32 creator;
+	u32 type;
+
+	umode_t umask;
+	uid_t uid;
+	gid_t gid;
+
+	int part, session;
+
+	unsigned long flags;
+
+	struct hlist_head rsrc_inodes;
+};
+
+#define HFSPLUS_SB_WRITEBACKUP	0x0001
+#define HFSPLUS_SB_NODECOMPOSE	0x0002
+#define HFSPLUS_SB_FORCE	0x0004
+#define HFSPLUS_SB_HFSX		0x0008
+
+
+struct hfsplus_inode_info {
+	struct semaphore extents_lock;
+	u32 clump_blocks, alloc_blocks;
+	sector_t fs_blocks;
+	/* Allocation extents from catalog record or volume header */
+	hfsplus_extent_rec first_extents;
+	u32 first_blocks;
+	hfsplus_extent_rec cached_extents;
+	u32 cached_start, cached_blocks;
+	atomic_t opencnt;
+
+	struct inode *rsrc_inode;
+	unsigned long flags;
+
+	__be32 create_date;
+	/* Device number in hfsplus_permissions in catalog */
+	u32 dev;
+	/* BSD system and user file flags */
+	u8 rootflags;
+	u8 userflags;
+
+	struct list_head open_dir_list;
+	loff_t phys_size;
+	struct inode vfs_inode;
+};
+
+#define HFSPLUS_FLG_RSRC	0x0001
+#define HFSPLUS_FLG_EXT_DIRTY	0x0002
+#define HFSPLUS_FLG_EXT_NEW	0x0004
+
+#define HFSPLUS_IS_DATA(inode)   (!(HFSPLUS_I(inode).flags & HFSPLUS_FLG_RSRC))
+#define HFSPLUS_IS_RSRC(inode)   (HFSPLUS_I(inode).flags & HFSPLUS_FLG_RSRC)
+
+struct hfs_find_data {
+	/* filled by caller */
+	hfsplus_btree_key *search_key;
+	hfsplus_btree_key *key;
+	/* filled by find */
+	struct hfs_btree *tree;
+	struct hfs_bnode *bnode;
+	/* filled by findrec */
+	int record;
+	int keyoffset, keylength;
+	int entryoffset, entrylength;
+};
+
+struct hfsplus_readdir_data {
+	struct list_head list;
+	struct file *file;
+	struct hfsplus_cat_key key;
+};
+
+#define hfs_btree_open hfsplus_btree_open
+#define hfs_btree_close hfsplus_btree_close
+#define hfs_btree_write hfsplus_btree_write
+#define hfs_bmap_alloc hfsplus_bmap_alloc
+#define hfs_bmap_free hfsplus_bmap_free
+#define hfs_bnode_read hfsplus_bnode_read
+#define hfs_bnode_read_u16 hfsplus_bnode_read_u16
+#define hfs_bnode_read_u8 hfsplus_bnode_read_u8
+#define hfs_bnode_read_key hfsplus_bnode_read_key
+#define hfs_bnode_write hfsplus_bnode_write
+#define hfs_bnode_write_u16 hfsplus_bnode_write_u16
+#define hfs_bnode_clear hfsplus_bnode_clear
+#define hfs_bnode_copy hfsplus_bnode_copy
+#define hfs_bnode_move hfsplus_bnode_move
+#define hfs_bnode_dump hfsplus_bnode_dump
+#define hfs_bnode_unlink hfsplus_bnode_unlink
+#define hfs_bnode_findhash hfsplus_bnode_findhash
+#define hfs_bnode_find hfsplus_bnode_find
+#define hfs_bnode_unhash hfsplus_bnode_unhash
+#define hfs_bnode_free hfsplus_bnode_free
+#define hfs_bnode_create hfsplus_bnode_create
+#define hfs_bnode_get hfsplus_bnode_get
+#define hfs_bnode_put hfsplus_bnode_put
+#define hfs_brec_lenoff hfsplus_brec_lenoff
+#define hfs_brec_keylen hfsplus_brec_keylen
+#define hfs_brec_insert hfsplus_brec_insert
+#define hfs_brec_remove hfsplus_brec_remove
+#define hfs_find_init hfsplus_find_init
+#define hfs_find_exit hfsplus_find_exit
+#define __hfs_brec_find __hplusfs_brec_find
+#define hfs_brec_find hfsplus_brec_find
+#define hfs_brec_read hfsplus_brec_read
+#define hfs_brec_goto hfsplus_brec_goto
+#define hfs_part_find hfsplus_part_find
+
+/*
+ * definitions for ext2 flag ioctls (linux really needs a generic
+ * interface for this).
+ */
+
+/* ext2 ioctls (EXT2_IOC_GETFLAGS and EXT2_IOC_SETFLAGS) to support
+ * chattr/lsattr */
+#define HFSPLUS_IOC_EXT2_GETFLAGS	FS_IOC_GETFLAGS
+#define HFSPLUS_IOC_EXT2_SETFLAGS	FS_IOC_SETFLAGS
+
+
+/*
+ * Functions in any *.c used in other files
+ */
+
+/* bitmap.c */
+int hfsplus_block_allocate(struct super_block *, u32, u32, u32 *);
+int hfsplus_block_free(struct super_block *, u32, u32);
+
+/* btree.c */
+struct hfs_btree *hfs_btree_open(struct super_block *, u32);
+void hfs_btree_close(struct hfs_btree *);
+void hfs_btree_write(struct hfs_btree *);
+struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *);
+void hfs_bmap_free(struct hfs_bnode *);
+
+/* bnode.c */
+void hfs_bnode_read(struct hfs_bnode *, void *, int, int);
+u16 hfs_bnode_read_u16(struct hfs_bnode *, int);
+u8 hfs_bnode_read_u8(struct hfs_bnode *, int);
+void hfs_bnode_read_key(struct hfs_bnode *, void *, int);
+void hfs_bnode_write(struct hfs_bnode *, void *, int, int);
+void hfs_bnode_write_u16(struct hfs_bnode *, int, u16);
+void hfs_bnode_clear(struct hfs_bnode *, int, int);
+void hfs_bnode_copy(struct hfs_bnode *, int,
+		    struct hfs_bnode *, int, int);
+void hfs_bnode_move(struct hfs_bnode *, int, int, int);
+void hfs_bnode_dump(struct hfs_bnode *);
+void hfs_bnode_unlink(struct hfs_bnode *);
+struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *, u32);
+struct hfs_bnode *hfs_bnode_find(struct hfs_btree *, u32);
+void hfs_bnode_unhash(struct hfs_bnode *);
+void hfs_bnode_free(struct hfs_bnode *);
+struct hfs_bnode *hfs_bnode_create(struct hfs_btree *, u32);
+void hfs_bnode_get(struct hfs_bnode *);
+void hfs_bnode_put(struct hfs_bnode *);
+
+/* brec.c */
+u16 hfs_brec_lenoff(struct hfs_bnode *, u16, u16 *);
+u16 hfs_brec_keylen(struct hfs_bnode *, u16);
+int hfs_brec_insert(struct hfs_find_data *, void *, int);
+int hfs_brec_remove(struct hfs_find_data *);
+
+/* bfind.c */
+int hfs_find_init(struct hfs_btree *, struct hfs_find_data *);
+void hfs_find_exit(struct hfs_find_data *);
+int __hfs_brec_find(struct hfs_bnode *, struct hfs_find_data *);
+int hfs_brec_find(struct hfs_find_data *);
+int hfs_brec_read(struct hfs_find_data *, void *, int);
+int hfs_brec_goto(struct hfs_find_data *, int);
+
+/* catalog.c */
+int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *, const hfsplus_btree_key *);
+int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *, const hfsplus_btree_key *);
+void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *, u32, struct qstr *);
+int hfsplus_find_cat(struct super_block *, u32, struct hfs_find_data *);
+int hfsplus_create_cat(u32, struct inode *, struct qstr *, struct inode *);
+int hfsplus_delete_cat(u32, struct inode *, struct qstr *);
+int hfsplus_rename_cat(u32, struct inode *, struct qstr *,
+		       struct inode *, struct qstr *);
+
+/* extents.c */
+int hfsplus_ext_cmp_key(const hfsplus_btree_key *, const hfsplus_btree_key *);
+void hfsplus_ext_write_extent(struct inode *);
+int hfsplus_get_block(struct inode *, sector_t, struct buffer_head *, int);
+int hfsplus_free_fork(struct super_block *, u32, struct hfsplus_fork_raw *, int);
+int hfsplus_file_extend(struct inode *);
+void hfsplus_file_truncate(struct inode *);
+
+/* inode.c */
+extern const struct address_space_operations hfsplus_aops;
+extern const struct address_space_operations hfsplus_btree_aops;
+
+void hfsplus_inode_read_fork(struct inode *, struct hfsplus_fork_raw *);
+void hfsplus_inode_write_fork(struct inode *, struct hfsplus_fork_raw *);
+int hfsplus_cat_read_inode(struct inode *, struct hfs_find_data *);
+int hfsplus_cat_write_inode(struct inode *);
+struct inode *hfsplus_new_inode(struct super_block *, int);
+void hfsplus_delete_inode(struct inode *);
+
+/* ioctl.c */
+int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+		  unsigned long arg);
+int hfsplus_setxattr(struct dentry *dentry, const char *name,
+		     const void *value, size_t size, int flags);
+ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
+			 void *value, size_t size);
+ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size);
+
+/* options.c */
+int hfsplus_parse_options(char *, struct hfsplus_sb_info *);
+void hfsplus_fill_defaults(struct hfsplus_sb_info *);
+int hfsplus_show_options(struct seq_file *, struct vfsmount *);
+
+/* tables.c */
+extern u16 hfsplus_case_fold_table[];
+extern u16 hfsplus_decompose_table[];
+extern u16 hfsplus_compose_table[];
+
+/* unicode.c */
+int hfsplus_strcasecmp(const struct hfsplus_unistr *, const struct hfsplus_unistr *);
+int hfsplus_strcmp(const struct hfsplus_unistr *, const struct hfsplus_unistr *);
+int hfsplus_uni2asc(struct super_block *, const struct hfsplus_unistr *, char *, int *);
+int hfsplus_asc2uni(struct super_block *, struct hfsplus_unistr *, const char *, int);
+
+/* wrapper.c */
+int hfsplus_read_wrapper(struct super_block *);
+
+int hfs_part_find(struct super_block *, sector_t *, sector_t *);
+
+/* access macros */
+/*
+static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+static inline struct hfsplus_inode_info *HFSPLUS_I(struct inode *inode)
+{
+	return list_entry(inode, struct hfsplus_inode_info, vfs_inode);
+}
+*/
+#define HFSPLUS_SB(super)	(*(struct hfsplus_sb_info *)(super)->s_fs_info)
+#define HFSPLUS_I(inode)	(*list_entry(inode, struct hfsplus_inode_info, vfs_inode))
+
+#if 1
+#define hfsplus_kmap(p)		({ struct page *__p = (p); kmap(__p); })
+#define hfsplus_kunmap(p)	({ struct page *__p = (p); kunmap(__p); __p; })
+#else
+#define hfsplus_kmap(p)		kmap(p)
+#define hfsplus_kunmap(p)	kunmap(p)
+#endif
+
+#define sb_bread512(sb, sec, data) ({			\
+	struct buffer_head *__bh;			\
+	sector_t __block;				\
+	loff_t __start;					\
+	int __offset;					\
+							\
+	__start = (loff_t)(sec) << HFSPLUS_SECTOR_SHIFT;\
+	__block = __start >> (sb)->s_blocksize_bits;	\
+	__offset = __start & ((sb)->s_blocksize - 1);	\
+	__bh = sb_bread((sb), __block);			\
+	if (likely(__bh != NULL))			\
+		data = (void *)(__bh->b_data + __offset);\
+	else						\
+		data = NULL;				\
+	__bh;						\
+})
+
+/* time macros */
+#define __hfsp_mt2ut(t)		(be32_to_cpu(t) - 2082844800U)
+#define __hfsp_ut2mt(t)		(cpu_to_be32(t + 2082844800U))
+
+/* compatibility */
+#define hfsp_mt2ut(t)		(struct timespec){ .tv_sec = __hfsp_mt2ut(t) }
+#define hfsp_ut2mt(t)		__hfsp_ut2mt((t).tv_sec)
+#define hfsp_now2mt()		__hfsp_ut2mt(get_seconds())
+
+#define kdev_t_to_nr(x)		(x)
+
+#endif

fs/hfsplus/hfsplus_raw.h

@@ -0,0 +1,335 @@
+/*
+ *  linux/include/linux/hfsplus_raw.h
+ *
+ * Copyright (C) 1999
+ * Brad Boyer (flar@pants.nu)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Format of structures on disk
+ * Information taken from Apple Technote #1150 (HFS Plus Volume Format)
+ *
+ */
+
+#ifndef _LINUX_HFSPLUS_RAW_H
+#define _LINUX_HFSPLUS_RAW_H
+
+#include <linux/types.h>
+
+/* Some constants */
+#define HFSPLUS_SECTOR_SIZE        512
+#define HFSPLUS_SECTOR_SHIFT         9
+#define HFSPLUS_VOLHEAD_SECTOR       2
+#define HFSPLUS_VOLHEAD_SIG     0x482b
+#define HFSPLUS_VOLHEAD_SIGX    0x4858
+#define HFSPLUS_SUPER_MAGIC     0x482b
+#define HFSPLUS_MIN_VERSION          4
+#define HFSPLUS_CURRENT_VERSION      5
+
+#define HFSP_WRAP_MAGIC         0x4244
+#define HFSP_WRAP_ATTRIB_SLOCK  0x8000
+#define HFSP_WRAP_ATTRIB_SPARED 0x0200
+
+#define HFSP_WRAPOFF_SIG          0x00
+#define HFSP_WRAPOFF_ATTRIB       0x0A
+#define HFSP_WRAPOFF_ABLKSIZE     0x14
+#define HFSP_WRAPOFF_ABLKSTART    0x1C
+#define HFSP_WRAPOFF_EMBEDSIG     0x7C
+#define HFSP_WRAPOFF_EMBEDEXT     0x7E
+
+#define HFSP_HIDDENDIR_NAME	"\xe2\x90\x80\xe2\x90\x80\xe2\x90\x80\xe2\x90\x80HFS+ Private Data"
+
+#define HFSP_HARDLINK_TYPE	0x686c6e6b	/* 'hlnk' */
+#define HFSP_HFSPLUS_CREATOR	0x6866732b	/* 'hfs+' */
+
+#define HFSP_SYMLINK_TYPE	0x736c6e6b	/* 'slnk' */
+#define HFSP_SYMLINK_CREATOR	0x72686170	/* 'rhap' */
+
+#define HFSP_MOUNT_VERSION	0x482b4c78	/* 'H+Lx' */
+
+/* Structures used on disk */
+
+typedef __be32 hfsplus_cnid;
+typedef __be16 hfsplus_unichr;
+
+/* A "string" as used in filenames, etc. */
+struct hfsplus_unistr {
+	__be16 length;
+	hfsplus_unichr unicode[255];
+} __packed;
+
+#define HFSPLUS_MAX_STRLEN 255
+
+/* POSIX permissions */
+struct hfsplus_perm {
+	__be32 owner;
+	__be32 group;
+	u8  rootflags;
+	u8  userflags;
+	__be16 mode;
+	__be32 dev;
+} __packed;
+
+#define HFSPLUS_FLG_NODUMP	0x01
+#define HFSPLUS_FLG_IMMUTABLE	0x02
+#define HFSPLUS_FLG_APPEND	0x04
+
+/* A single contiguous area of a file */
+struct hfsplus_extent {
+	__be32 start_block;
+	__be32 block_count;
+} __packed;
+typedef struct hfsplus_extent hfsplus_extent_rec[8];
+
+/* Information for a "Fork" in a file */
+struct hfsplus_fork_raw {
+	__be64 total_size;
+	__be32 clump_size;
+	__be32 total_blocks;
+	hfsplus_extent_rec extents;
+} __packed;
+
+/* HFS+ Volume Header */
+struct hfsplus_vh {
+	__be16 signature;
+	__be16 version;
+	__be32 attributes;
+	__be32 last_mount_vers;
+	u32 reserved;
+
+	__be32 create_date;
+	__be32 modify_date;
+	__be32 backup_date;
+	__be32 checked_date;
+
+	__be32 file_count;
+	__be32 folder_count;
+
+	__be32 blocksize;
+	__be32 total_blocks;
+	__be32 free_blocks;
+
+	__be32 next_alloc;
+	__be32 rsrc_clump_sz;
+	__be32 data_clump_sz;
+	hfsplus_cnid next_cnid;
+
+	__be32 write_count;
+	__be64 encodings_bmp;
+
+	u8 finder_info[32];
+
+	struct hfsplus_fork_raw alloc_file;
+	struct hfsplus_fork_raw ext_file;
+	struct hfsplus_fork_raw cat_file;
+	struct hfsplus_fork_raw attr_file;
+	struct hfsplus_fork_raw start_file;
+} __packed;
+
+/* HFS+ volume attributes */
+#define HFSPLUS_VOL_UNMNT		(1 << 8)
+#define HFSPLUS_VOL_SPARE_BLK		(1 << 9)
+#define HFSPLUS_VOL_NOCACHE		(1 << 10)
+#define HFSPLUS_VOL_INCNSTNT		(1 << 11)
+#define HFSPLUS_VOL_NODEID_REUSED	(1 << 12)
+#define HFSPLUS_VOL_JOURNALED		(1 << 13)
+#define HFSPLUS_VOL_SOFTLOCK		(1 << 15)
+
+/* HFS+ BTree node descriptor */
+struct hfs_bnode_desc {
+	__be32 next;
+	__be32 prev;
+	s8 type;
+	u8 height;
+	__be16 num_recs;
+	u16 reserved;
+} __packed;
+
+/* HFS+ BTree node types */
+#define HFS_NODE_INDEX	0x00
+#define HFS_NODE_HEADER	0x01
+#define HFS_NODE_MAP	0x02
+#define HFS_NODE_LEAF	0xFF
+
+/* HFS+ BTree header */
+struct hfs_btree_header_rec {
+	__be16 depth;
+	__be32 root;
+	__be32 leaf_count;
+	__be32 leaf_head;
+	__be32 leaf_tail;
+	__be16 node_size;
+	__be16 max_key_len;
+	__be32 node_count;
+	__be32 free_nodes;
+	u16 reserved1;
+	__be32 clump_size;
+	u8 btree_type;
+	u8 key_type;
+	__be32 attributes;
+	u32 reserved3[16];
+} __packed;
+
+/* BTree attributes */
+#define HFS_TREE_BIGKEYS	2
+#define HFS_TREE_VARIDXKEYS	4
+
+/* HFS+ BTree misc info */
+#define HFSPLUS_TREE_HEAD 0
+#define HFSPLUS_NODE_MXSZ 32768
+
+/* Some special File ID numbers (stolen from hfs.h) */
+#define HFSPLUS_POR_CNID		1	/* Parent Of the Root */
+#define HFSPLUS_ROOT_CNID		2	/* ROOT directory */
+#define HFSPLUS_EXT_CNID		3	/* EXTents B-tree */
+#define HFSPLUS_CAT_CNID		4	/* CATalog B-tree */
+#define HFSPLUS_BAD_CNID		5	/* BAD blocks file */
+#define HFSPLUS_ALLOC_CNID		6	/* ALLOCation file */
+#define HFSPLUS_START_CNID		7	/* STARTup file */
+#define HFSPLUS_ATTR_CNID		8	/* ATTRibutes file */
+#define HFSPLUS_EXCH_CNID		15	/* ExchangeFiles temp id */
+#define HFSPLUS_FIRSTUSER_CNID		16	/* first available user id */
+
+/* btree key type */
+#define HFSPLUS_KEY_CASEFOLDING		0xCF	/* case-insensitive */
+#define HFSPLUS_KEY_BINARY		0xBC	/* case-sensitive */
+
+/* HFS+ catalog entry key */
+struct hfsplus_cat_key {
+	__be16 key_len;
+	hfsplus_cnid parent;
+	struct hfsplus_unistr name;
+} __packed;
+
+
+/* Structs from hfs.h */
+struct hfsp_point {
+	__be16 v;
+	__be16 h;
+} __packed;
+
+struct hfsp_rect {
+	__be16 top;
+	__be16 left;
+	__be16 bottom;
+	__be16 right;
+} __packed;
+
+
+/* HFS directory info (stolen from hfs.h */
+struct DInfo {
+	struct hfsp_rect frRect;
+	__be16 frFlags;
+	struct hfsp_point frLocation;
+	__be16 frView;
+} __packed;
+
+struct DXInfo {
+	struct hfsp_point frScroll;
+	__be32 frOpenChain;
+	__be16 frUnused;
+	__be16 frComment;
+	__be32 frPutAway;
+} __packed;
+
+/* HFS+ folder data (part of an hfsplus_cat_entry) */
+struct hfsplus_cat_folder {
+	__be16 type;
+	__be16 flags;
+	__be32 valence;
+	hfsplus_cnid id;
+	__be32 create_date;
+	__be32 content_mod_date;
+	__be32 attribute_mod_date;
+	__be32 access_date;
+	__be32 backup_date;
+	struct hfsplus_perm permissions;
+	struct DInfo user_info;
+	struct DXInfo finder_info;
+	__be32 text_encoding;
+	u32 reserved;
+} __packed;
+
+/* HFS file info (stolen from hfs.h) */
+struct FInfo {
+	__be32 fdType;
+	__be32 fdCreator;
+	__be16 fdFlags;
+	struct hfsp_point fdLocation;
+	__be16 fdFldr;
+} __packed;
+
+struct FXInfo {
+	__be16 fdIconID;
+	u8 fdUnused[8];
+	__be16 fdComment;
+	__be32 fdPutAway;
+} __packed;
+
+/* HFS+ file data (part of a cat_entry) */
+struct hfsplus_cat_file {
+	__be16 type;
+	__be16 flags;
+	u32 reserved1;
+	hfsplus_cnid id;
+	__be32 create_date;
+	__be32 content_mod_date;
+	__be32 attribute_mod_date;
+	__be32 access_date;
+	__be32 backup_date;
+	struct hfsplus_perm permissions;
+	struct FInfo user_info;
+	struct FXInfo finder_info;
+	__be32 text_encoding;
+	u32 reserved2;
+
+	struct hfsplus_fork_raw data_fork;
+	struct hfsplus_fork_raw rsrc_fork;
+} __packed;
+
+/* File attribute bits */
+#define HFSPLUS_FILE_LOCKED		0x0001
+#define HFSPLUS_FILE_THREAD_EXISTS	0x0002
+
+/* HFS+ catalog thread (part of a cat_entry) */
+struct hfsplus_cat_thread {
+	__be16 type;
+	s16 reserved;
+	hfsplus_cnid parentID;
+	struct hfsplus_unistr nodeName;
+} __packed;
+
+#define HFSPLUS_MIN_THREAD_SZ 10
+
+/* A data record in the catalog tree */
+typedef union {
+	__be16 type;
+	struct hfsplus_cat_folder folder;
+	struct hfsplus_cat_file file;
+	struct hfsplus_cat_thread thread;
+} __packed hfsplus_cat_entry;
+
+/* HFS+ catalog entry type */
+#define HFSPLUS_FOLDER         0x0001
+#define HFSPLUS_FILE           0x0002
+#define HFSPLUS_FOLDER_THREAD  0x0003
+#define HFSPLUS_FILE_THREAD    0x0004
+
+/* HFS+ extents tree key */
+struct hfsplus_ext_key {
+	__be16 key_len;
+	u8 fork_type;
+	u8 pad;
+	hfsplus_cnid cnid;
+	__be32 start_block;
+} __packed;
+
+#define HFSPLUS_EXT_KEYLEN 12
+
+/* HFS+ generic BTree key */
+typedef union {
+	__be16 key_len;
+	struct hfsplus_cat_key cat;
+	struct hfsplus_ext_key ext;
+} __packed hfsplus_btree_key;
+
+#endif

fs/hfsplus/inode.c

@@ -0,0 +1,532 @@
+/*
+ *  linux/fs/hfsplus/inode.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Inode handling routines
+ */
+
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/mpage.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+static int hfsplus_readpage(struct file *file, struct page *page)
+{
+	return block_read_full_page(page, hfsplus_get_block);
+}
+
+static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
+{
+	return block_write_full_page(page, hfsplus_get_block, wbc);
+}
+
+static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
+{
+	return cont_prepare_write(page, from, to, hfsplus_get_block,
+		&HFSPLUS_I(page->mapping->host).phys_size);
+}
+
+static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
+{
+	return generic_block_bmap(mapping, block, hfsplus_get_block);
+}
+
+static int hfsplus_releasepage(struct page *page, gfp_t mask)
+{
+	struct inode *inode = page->mapping->host;
+	struct super_block *sb = inode->i_sb;
+	struct hfs_btree *tree;
+	struct hfs_bnode *node;
+	u32 nidx;
+	int i, res = 1;
+
+	switch (inode->i_ino) {
+	case HFSPLUS_EXT_CNID:
+		tree = HFSPLUS_SB(sb).ext_tree;
+		break;
+	case HFSPLUS_CAT_CNID:
+		tree = HFSPLUS_SB(sb).cat_tree;
+		break;
+	case HFSPLUS_ATTR_CNID:
+		tree = HFSPLUS_SB(sb).attr_tree;
+		break;
+	default:
+		BUG();
+		return 0;
+	}
+	if (tree->node_size >= PAGE_CACHE_SIZE) {
+		nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
+		spin_lock(&tree->hash_lock);
+		node = hfs_bnode_findhash(tree, nidx);
+		if (!node)
+			;
+		else if (atomic_read(&node->refcnt))
+			res = 0;
+		if (res && node) {
+			hfs_bnode_unhash(node);
+			hfs_bnode_free(node);
+		}
+		spin_unlock(&tree->hash_lock);
+	} else {
+		nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
+		i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
+		spin_lock(&tree->hash_lock);
+		do {
+			node = hfs_bnode_findhash(tree, nidx++);
+			if (!node)
+				continue;
+			if (atomic_read(&node->refcnt)) {
+				res = 0;
+				break;
+			}
+			hfs_bnode_unhash(node);
+			hfs_bnode_free(node);
+		} while (--i && nidx < tree->node_count);
+		spin_unlock(&tree->hash_lock);
+	}
+	return res ? try_to_free_buffers(page) : 0;
+}
+
+static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
+		const struct iovec *iov, loff_t offset, unsigned long nr_segs)
+{
+	struct file *file = iocb->ki_filp;
+	struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
+
+	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+				  offset, nr_segs, hfsplus_get_block, NULL);
+}
+
+static int hfsplus_writepages(struct address_space *mapping,
+			      struct writeback_control *wbc)
+{
+	return mpage_writepages(mapping, wbc, hfsplus_get_block);
+}
+
+const struct address_space_operations hfsplus_btree_aops = {
+	.readpage	= hfsplus_readpage,
+	.writepage	= hfsplus_writepage,
+	.sync_page	= block_sync_page,
+	.prepare_write	= hfsplus_prepare_write,
+	.commit_write	= generic_commit_write,
+	.bmap		= hfsplus_bmap,
+	.releasepage	= hfsplus_releasepage,
+};
+
+const struct address_space_operations hfsplus_aops = {
+	.readpage	= hfsplus_readpage,
+	.writepage	= hfsplus_writepage,
+	.sync_page	= block_sync_page,
+	.prepare_write	= hfsplus_prepare_write,
+	.commit_write	= generic_commit_write,
+	.bmap		= hfsplus_bmap,
+	.direct_IO	= hfsplus_direct_IO,
+	.writepages	= hfsplus_writepages,
+};
+
+static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
+					  struct nameidata *nd)
+{
+	struct hfs_find_data fd;
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode = NULL;
+	int err;
+
+	if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
+		goto out;
+
+	inode = HFSPLUS_I(dir).rsrc_inode;
+	if (inode)
+		goto out;
+
+	inode = new_inode(sb);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	inode->i_ino = dir->i_ino;
+	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
+	init_MUTEX(&HFSPLUS_I(inode).extents_lock);
+	HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
+
+	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+	err = hfsplus_find_cat(sb, dir->i_ino, &fd);
+	if (!err)
+		err = hfsplus_cat_read_inode(inode, &fd);
+	hfs_find_exit(&fd);
+	if (err) {
+		iput(inode);
+		return ERR_PTR(err);
+	}
+	HFSPLUS_I(inode).rsrc_inode = dir;
+	HFSPLUS_I(dir).rsrc_inode = inode;
+	igrab(dir);
+	hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
+	mark_inode_dirty(inode);
+out:
+	d_add(dentry, inode);
+	return NULL;
+}
+
+static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
+{
+	struct super_block *sb = inode->i_sb;
+	u16 mode;
+
+	mode = be16_to_cpu(perms->mode);
+
+	inode->i_uid = be32_to_cpu(perms->owner);
+	if (!inode->i_uid && !mode)
+		inode->i_uid = HFSPLUS_SB(sb).uid;
+
+	inode->i_gid = be32_to_cpu(perms->group);
+	if (!inode->i_gid && !mode)
+		inode->i_gid = HFSPLUS_SB(sb).gid;
+
+	if (dir) {
+		mode = mode ? (mode & S_IALLUGO) :
+			(S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
+		mode |= S_IFDIR;
+	} else if (!mode)
+		mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
+			~(HFSPLUS_SB(sb).umask));
+	inode->i_mode = mode;
+
+	HFSPLUS_I(inode).rootflags = perms->rootflags;
+	HFSPLUS_I(inode).userflags = perms->userflags;
+	if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
+		inode->i_flags |= S_IMMUTABLE;
+	else
+		inode->i_flags &= ~S_IMMUTABLE;
+	if (perms->rootflags & HFSPLUS_FLG_APPEND)
+		inode->i_flags |= S_APPEND;
+	else
+		inode->i_flags &= ~S_APPEND;
+}
+
+static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
+{
+	if (inode->i_flags & S_IMMUTABLE)
+		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
+	else
+		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
+	if (inode->i_flags & S_APPEND)
+		perms->rootflags |= HFSPLUS_FLG_APPEND;
+	else
+		perms->rootflags &= ~HFSPLUS_FLG_APPEND;
+	perms->userflags = HFSPLUS_I(inode).userflags;
+	perms->mode = cpu_to_be16(inode->i_mode);
+	perms->owner = cpu_to_be32(inode->i_uid);
+	perms->group = cpu_to_be32(inode->i_gid);
+	perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
+}
+
+static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+	/* MAY_EXEC is also used for lookup, if no x bit is set allow lookup,
+	 * open_exec has the same test, so it's still not executable, if a x bit
+	 * is set fall back to standard permission check.
+	 */
+	if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
+		return 0;
+	return generic_permission(inode, mask, NULL);
+}
+
+
+static int hfsplus_file_open(struct inode *inode, struct file *file)
+{
+	if (HFSPLUS_IS_RSRC(inode))
+		inode = HFSPLUS_I(inode).rsrc_inode;
+	if (atomic_read(&file->f_count) != 1)
+		return 0;
+	atomic_inc(&HFSPLUS_I(inode).opencnt);
+	return 0;
+}
+
+static int hfsplus_file_release(struct inode *inode, struct file *file)
+{
+	struct super_block *sb = inode->i_sb;
+
+	if (HFSPLUS_IS_RSRC(inode))
+		inode = HFSPLUS_I(inode).rsrc_inode;
+	if (atomic_read(&file->f_count) != 0)
+		return 0;
+	if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
+		mutex_lock(&inode->i_mutex);
+		hfsplus_file_truncate(inode);
+		if (inode->i_flags & S_DEAD) {
+			hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
+			hfsplus_delete_inode(inode);
+		}
+		mutex_unlock(&inode->i_mutex);
+	}
+	return 0;
+}
+
+extern const struct inode_operations hfsplus_dir_inode_operations;
+extern struct file_operations hfsplus_dir_operations;
+
+static const struct inode_operations hfsplus_file_inode_operations = {
+	.lookup		= hfsplus_file_lookup,
+	.truncate	= hfsplus_file_truncate,
+	.permission	= hfsplus_permission,
+	.setxattr	= hfsplus_setxattr,
+	.getxattr	= hfsplus_getxattr,
+	.listxattr	= hfsplus_listxattr,
+};
+
+static const struct file_operations hfsplus_file_operations = {
+	.llseek 	= generic_file_llseek,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
+	.mmap		= generic_file_mmap,
+	.sendfile	= generic_file_sendfile,
+	.fsync		= file_fsync,
+	.open		= hfsplus_file_open,
+	.release	= hfsplus_file_release,
+	.ioctl          = hfsplus_ioctl,
+};
+
+struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
+{
+	struct inode *inode = new_inode(sb);
+	if (!inode)
+		return NULL;
+
+	inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
+	inode->i_mode = mode;
+	inode->i_uid = current->fsuid;
+	inode->i_gid = current->fsgid;
+	inode->i_nlink = 1;
+	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
+	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
+	init_MUTEX(&HFSPLUS_I(inode).extents_lock);
+	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
+	HFSPLUS_I(inode).flags = 0;
+	memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
+	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
+	HFSPLUS_I(inode).alloc_blocks = 0;
+	HFSPLUS_I(inode).first_blocks = 0;
+	HFSPLUS_I(inode).cached_start = 0;
+	HFSPLUS_I(inode).cached_blocks = 0;
+	HFSPLUS_I(inode).phys_size = 0;
+	HFSPLUS_I(inode).fs_blocks = 0;
+	HFSPLUS_I(inode).rsrc_inode = NULL;
+	if (S_ISDIR(inode->i_mode)) {
+		inode->i_size = 2;
+		HFSPLUS_SB(sb).folder_count++;
+		inode->i_op = &hfsplus_dir_inode_operations;
+		inode->i_fop = &hfsplus_dir_operations;
+	} else if (S_ISREG(inode->i_mode)) {
+		HFSPLUS_SB(sb).file_count++;
+		inode->i_op = &hfsplus_file_inode_operations;
+		inode->i_fop = &hfsplus_file_operations;
+		inode->i_mapping->a_ops = &hfsplus_aops;
+		HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
+	} else if (S_ISLNK(inode->i_mode)) {
+		HFSPLUS_SB(sb).file_count++;
+		inode->i_op = &page_symlink_inode_operations;
+		inode->i_mapping->a_ops = &hfsplus_aops;
+		HFSPLUS_I(inode).clump_blocks = 1;
+	} else
+		HFSPLUS_SB(sb).file_count++;
+	insert_inode_hash(inode);
+	mark_inode_dirty(inode);
+	sb->s_dirt = 1;
+
+	return inode;
+}
+
+void hfsplus_delete_inode(struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+
+	if (S_ISDIR(inode->i_mode)) {
+		HFSPLUS_SB(sb).folder_count--;
+		sb->s_dirt = 1;
+		return;
+	}
+	HFSPLUS_SB(sb).file_count--;
+	if (S_ISREG(inode->i_mode)) {
+		if (!inode->i_nlink) {
+			inode->i_size = 0;
+			hfsplus_file_truncate(inode);
+		}
+	} else if (S_ISLNK(inode->i_mode)) {
+		inode->i_size = 0;
+		hfsplus_file_truncate(inode);
+	}
+	sb->s_dirt = 1;
+}
+
+void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
+{
+	struct super_block *sb = inode->i_sb;
+	u32 count;
+	int i;
+
+	memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
+	       sizeof(hfsplus_extent_rec));
+	for (count = 0, i = 0; i < 8; i++)
+		count += be32_to_cpu(fork->extents[i].block_count);
+	HFSPLUS_I(inode).first_blocks = count;
+	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
+	HFSPLUS_I(inode).cached_start = 0;
+	HFSPLUS_I(inode).cached_blocks = 0;
+
+	HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
+	inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
+	HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
+	inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
+	HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
+	if (!HFSPLUS_I(inode).clump_blocks)
+		HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
+				HFSPLUS_SB(sb).data_clump_blocks;
+}
+
+void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
+{
+	memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
+	       sizeof(hfsplus_extent_rec));
+	fork->total_size = cpu_to_be64(inode->i_size);
+	fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
+}
+
+int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
+{
+	hfsplus_cat_entry entry;
+	int res = 0;
+	u16 type;
+
+	type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
+
+	HFSPLUS_I(inode).dev = 0;
+	if (type == HFSPLUS_FOLDER) {
+		struct hfsplus_cat_folder *folder = &entry.folder;
+
+		if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
+			/* panic? */;
+		hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
+					sizeof(struct hfsplus_cat_folder));
+		hfsplus_get_perms(inode, &folder->permissions, 1);
+		inode->i_nlink = 1;
+		inode->i_size = 2 + be32_to_cpu(folder->valence);
+		inode->i_atime = hfsp_mt2ut(folder->access_date);
+		inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
+		inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
+		HFSPLUS_I(inode).create_date = folder->create_date;
+		HFSPLUS_I(inode).fs_blocks = 0;
+		inode->i_op = &hfsplus_dir_inode_operations;
+		inode->i_fop = &hfsplus_dir_operations;
+	} else if (type == HFSPLUS_FILE) {
+		struct hfsplus_cat_file *file = &entry.file;
+
+		if (fd->entrylength < sizeof(struct hfsplus_cat_file))
+			/* panic? */;
+		hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
+					sizeof(struct hfsplus_cat_file));
+
+		hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
+					&file->data_fork : &file->rsrc_fork);
+		hfsplus_get_perms(inode, &file->permissions, 0);
+		inode->i_nlink = 1;
+		if (S_ISREG(inode->i_mode)) {
+			if (file->permissions.dev)
+				inode->i_nlink = be32_to_cpu(file->permissions.dev);
+			inode->i_op = &hfsplus_file_inode_operations;
+			inode->i_fop = &hfsplus_file_operations;
+			inode->i_mapping->a_ops = &hfsplus_aops;
+		} else if (S_ISLNK(inode->i_mode)) {
+			inode->i_op = &page_symlink_inode_operations;
+			inode->i_mapping->a_ops = &hfsplus_aops;
+		} else {
+			init_special_inode(inode, inode->i_mode,
+					   be32_to_cpu(file->permissions.dev));
+		}
+		inode->i_atime = hfsp_mt2ut(file->access_date);
+		inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
+		inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
+		HFSPLUS_I(inode).create_date = file->create_date;
+	} else {
+		printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
+		res = -EIO;
+	}
+	return res;
+}
+
+int hfsplus_cat_write_inode(struct inode *inode)
+{
+	struct inode *main_inode = inode;
+	struct hfs_find_data fd;
+	hfsplus_cat_entry entry;
+
+	if (HFSPLUS_IS_RSRC(inode))
+		main_inode = HFSPLUS_I(inode).rsrc_inode;
+
+	if (!main_inode->i_nlink)
+		return 0;
+
+	if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
+		/* panic? */
+		return -EIO;
+
+	if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
+		/* panic? */
+		goto out;
+
+	if (S_ISDIR(main_inode->i_mode)) {
+		struct hfsplus_cat_folder *folder = &entry.folder;
+
+		if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
+			/* panic? */;
+		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
+					sizeof(struct hfsplus_cat_folder));
+		/* simple node checks? */
+		hfsplus_set_perms(inode, &folder->permissions);
+		folder->access_date = hfsp_ut2mt(inode->i_atime);
+		folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
+		folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
+		folder->valence = cpu_to_be32(inode->i_size - 2);
+		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
+					 sizeof(struct hfsplus_cat_folder));
+	} else if (HFSPLUS_IS_RSRC(inode)) {
+		struct hfsplus_cat_file *file = &entry.file;
+		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
+			       sizeof(struct hfsplus_cat_file));
+		hfsplus_inode_write_fork(inode, &file->rsrc_fork);
+		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
+				sizeof(struct hfsplus_cat_file));
+	} else {
+		struct hfsplus_cat_file *file = &entry.file;
+
+		if (fd.entrylength < sizeof(struct hfsplus_cat_file))
+			/* panic? */;
+		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
+					sizeof(struct hfsplus_cat_file));
+		hfsplus_inode_write_fork(inode, &file->data_fork);
+		if (S_ISREG(inode->i_mode))
+			HFSPLUS_I(inode).dev = inode->i_nlink;
+		if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
+			HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
+		hfsplus_set_perms(inode, &file->permissions);
+		if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
+			file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
+		else
+			file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
+		file->access_date = hfsp_ut2mt(inode->i_atime);
+		file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
+		file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
+		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
+					 sizeof(struct hfsplus_cat_file));
+	}
+out:
+	hfs_find_exit(&fd);
+	return 0;
+}

fs/hfsplus/ioctl.c

@@ -0,0 +1,188 @@
+/*
+ *  linux/fs/hfsplus/ioctl.c
+ *
+ * Copyright (C) 2003
+ * Ethan Benson <erbenson@alaska.net>
+ * partially derived from linux/fs/ext2/ioctl.c
+ * Copyright (C) 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ * hfsplus ioctls
+ */
+
+#include <linux/capability.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/xattr.h>
+#include <asm/uaccess.h>
+#include "hfsplus_fs.h"
+
+int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+		  unsigned long arg)
+{
+	unsigned int flags;
+
+	switch (cmd) {
+	case HFSPLUS_IOC_EXT2_GETFLAGS:
+		flags = 0;
+		if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_IMMUTABLE)
+			flags |= FS_IMMUTABLE_FL; /* EXT2_IMMUTABLE_FL */
+		if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_APPEND)
+			flags |= FS_APPEND_FL; /* EXT2_APPEND_FL */
+		if (HFSPLUS_I(inode).userflags & HFSPLUS_FLG_NODUMP)
+			flags |= FS_NODUMP_FL; /* EXT2_NODUMP_FL */
+		return put_user(flags, (int __user *)arg);
+	case HFSPLUS_IOC_EXT2_SETFLAGS: {
+		if (IS_RDONLY(inode))
+			return -EROFS;
+
+		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+			return -EACCES;
+
+		if (get_user(flags, (int __user *)arg))
+			return -EFAULT;
+
+		if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) ||
+		    HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) {
+			if (!capable(CAP_LINUX_IMMUTABLE))
+				return -EPERM;
+		}
+
+		/* don't silently ignore unsupported ext2 flags */
+		if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL))
+			return -EOPNOTSUPP;
+
+		if (flags & FS_IMMUTABLE_FL) { /* EXT2_IMMUTABLE_FL */
+			inode->i_flags |= S_IMMUTABLE;
+			HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
+		} else {
+			inode->i_flags &= ~S_IMMUTABLE;
+			HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
+		}
+		if (flags & FS_APPEND_FL) { /* EXT2_APPEND_FL */
+			inode->i_flags |= S_APPEND;
+			HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_APPEND;
+		} else {
+			inode->i_flags &= ~S_APPEND;
+			HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_APPEND;
+		}
+		if (flags & FS_NODUMP_FL) /* EXT2_NODUMP_FL */
+			HFSPLUS_I(inode).userflags |= HFSPLUS_FLG_NODUMP;
+		else
+			HFSPLUS_I(inode).userflags &= ~HFSPLUS_FLG_NODUMP;
+
+		inode->i_ctime = CURRENT_TIME_SEC;
+		mark_inode_dirty(inode);
+		return 0;
+	}
+	default:
+		return -ENOTTY;
+	}
+}
+
+int hfsplus_setxattr(struct dentry *dentry, const char *name,
+		     const void *value, size_t size, int flags)
+{
+	struct inode *inode = dentry->d_inode;
+	struct hfs_find_data fd;
+	hfsplus_cat_entry entry;
+	struct hfsplus_cat_file *file;
+	int res;
+
+	if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
+		return -EOPNOTSUPP;
+
+	res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
+	if (res)
+		return res;
+	res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+	if (res)
+		goto out;
+	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
+			sizeof(struct hfsplus_cat_file));
+	file = &entry.file;
+
+	if (!strcmp(name, "hfs.type")) {
+		if (size == 4)
+			memcpy(&file->user_info.fdType, value, 4);
+		else
+			res = -ERANGE;
+	} else if (!strcmp(name, "hfs.creator")) {
+		if (size == 4)
+			memcpy(&file->user_info.fdCreator, value, 4);
+		else
+			res = -ERANGE;
+	} else
+		res = -EOPNOTSUPP;
+	if (!res)
+		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
+				sizeof(struct hfsplus_cat_file));
+out:
+	hfs_find_exit(&fd);
+	return res;
+}
+
+ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
+			 void *value, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	struct hfs_find_data fd;
+	hfsplus_cat_entry entry;
+	struct hfsplus_cat_file *file;
+	ssize_t res = 0;
+
+	if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
+		return -EOPNOTSUPP;
+
+	if (size) {
+		res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
+		if (res)
+			return res;
+		res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+		if (res)
+			goto out;
+		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
+				sizeof(struct hfsplus_cat_file));
+	}
+	file = &entry.file;
+
+	if (!strcmp(name, "hfs.type")) {
+		if (size >= 4) {
+			memcpy(value, &file->user_info.fdType, 4);
+			res = 4;
+		} else
+			res = size ? -ERANGE : 4;
+	} else if (!strcmp(name, "hfs.creator")) {
+		if (size >= 4) {
+			memcpy(value, &file->user_info.fdCreator, 4);
+			res = 4;
+		} else
+			res = size ? -ERANGE : 4;
+	} else
+		res = -ENODATA;
+out:
+	if (size)
+		hfs_find_exit(&fd);
+	return res;
+}
+
+#define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
+
+ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+
+	if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
+		return -EOPNOTSUPP;
+
+	if (!buffer || !size)
+		return HFSPLUS_ATTRLIST_SIZE;
+	if (size < HFSPLUS_ATTRLIST_SIZE)
+		return -ERANGE;
+	strcpy(buffer, "hfs.type");
+	strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
+
+	return HFSPLUS_ATTRLIST_SIZE;
+}

fs/hfsplus/options.c

@@ -0,0 +1,188 @@
+/*
+ *  linux/fs/hfsplus/options.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Option parsing
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/parser.h>
+#include <linux/nls.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
+#include "hfsplus_fs.h"
+
+enum {
+	opt_creator, opt_type,
+	opt_umask, opt_uid, opt_gid,
+	opt_part, opt_session, opt_nls,
+	opt_nodecompose, opt_decompose,
+	opt_force, opt_err
+};
+
+static match_table_t tokens = {
+	{ opt_creator, "creator=%s" },
+	{ opt_type, "type=%s" },
+	{ opt_umask, "umask=%o" },
+	{ opt_uid, "uid=%u" },
+	{ opt_gid, "gid=%u" },
+	{ opt_part, "part=%u" },
+	{ opt_session, "session=%u" },
+	{ opt_nls, "nls=%s" },
+	{ opt_decompose, "decompose" },
+	{ opt_nodecompose, "nodecompose" },
+	{ opt_force, "force" },
+	{ opt_err, NULL }
+};
+
+/* Initialize an options object to reasonable defaults */
+void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
+{
+	if (!opts)
+		return;
+
+	opts->creator = HFSPLUS_DEF_CR_TYPE;
+	opts->type = HFSPLUS_DEF_CR_TYPE;
+	opts->umask = current->fs->umask;
+	opts->uid = current->uid;
+	opts->gid = current->gid;
+	opts->part = -1;
+	opts->session = -1;
+}
+
+/* convert a "four byte character" to a 32 bit int with error checks */
+static inline int match_fourchar(substring_t *arg, u32 *result)
+{
+	if (arg->to - arg->from != 4)
+		return -EINVAL;
+	memcpy(result, arg->from, 4);
+	return 0;
+}
+
+/* Parse options from mount. Returns 0 on failure */
+/* input is the options passed to mount() as a string */
+int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int tmp, token;
+
+	if (!input)
+		goto done;
+
+	while ((p = strsep(&input, ",")) != NULL) {
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case opt_creator:
+			if (match_fourchar(&args[0], &sbi->creator)) {
+				printk(KERN_ERR "hfs: creator requires a 4 character value\n");
+				return 0;
+			}
+			break;
+		case opt_type:
+			if (match_fourchar(&args[0], &sbi->type)) {
+				printk(KERN_ERR "hfs: type requires a 4 character value\n");
+				return 0;
+			}
+			break;
+		case opt_umask:
+			if (match_octal(&args[0], &tmp)) {
+				printk(KERN_ERR "hfs: umask requires a value\n");
+				return 0;
+			}
+			sbi->umask = (umode_t)tmp;
+			break;
+		case opt_uid:
+			if (match_int(&args[0], &tmp)) {
+				printk(KERN_ERR "hfs: uid requires an argument\n");
+				return 0;
+			}
+			sbi->uid = (uid_t)tmp;
+			break;
+		case opt_gid:
+			if (match_int(&args[0], &tmp)) {
+				printk(KERN_ERR "hfs: gid requires an argument\n");
+				return 0;
+			}
+			sbi->gid = (gid_t)tmp;
+			break;
+		case opt_part:
+			if (match_int(&args[0], &sbi->part)) {
+				printk(KERN_ERR "hfs: part requires an argument\n");
+				return 0;
+			}
+			break;
+		case opt_session:
+			if (match_int(&args[0], &sbi->session)) {
+				printk(KERN_ERR "hfs: session requires an argument\n");
+				return 0;
+			}
+			break;
+		case opt_nls:
+			if (sbi->nls) {
+				printk(KERN_ERR "hfs: unable to change nls mapping\n");
+				return 0;
+			}
+			p = match_strdup(&args[0]);
+			sbi->nls = load_nls(p);
+			if (!sbi->nls) {
+				printk(KERN_ERR "hfs: unable to load nls mapping \"%s\"\n", p);
+				kfree(p);
+				return 0;
+			}
+			kfree(p);
+			break;
+		case opt_decompose:
+			sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE;
+			break;
+		case opt_nodecompose:
+			sbi->flags |= HFSPLUS_SB_NODECOMPOSE;
+			break;
+		case opt_force:
+			sbi->flags |= HFSPLUS_SB_FORCE;
+			break;
+		default:
+			return 0;
+		}
+	}
+
+done:
+	if (!sbi->nls) {
+		/* try utf8 first, as this is the old default behaviour */
+		sbi->nls = load_nls("utf8");
+		if (!sbi->nls)
+			sbi->nls = load_nls_default();
+		if (!sbi->nls)
+			return 0;
+	}
+
+	return 1;
+}
+
+int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)
+{
+	struct hfsplus_sb_info *sbi = &HFSPLUS_SB(mnt->mnt_sb);
+
+	if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
+		seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
+	if (sbi->type != HFSPLUS_DEF_CR_TYPE)
+		seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
+	seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid);
+	if (sbi->part >= 0)
+		seq_printf(seq, ",part=%u", sbi->part);
+	if (sbi->session >= 0)
+		seq_printf(seq, ",session=%u", sbi->session);
+	if (sbi->nls)
+		seq_printf(seq, ",nls=%s", sbi->nls->charset);
+	if (sbi->flags & HFSPLUS_SB_NODECOMPOSE)
+		seq_printf(seq, ",nodecompose");
+	return 0;
+}

fs/hfsplus/part_tbl.c

@@ -0,0 +1,133 @@
+/*
+ * linux/fs/hfsplus/part_tbl.c
+ *
+ * Copyright (C) 1996-1997  Paul H. Hargrove
+ * This file may be distributed under the terms of the GNU General Public License.
+ *
+ * Original code to handle the new style Mac partition table based on
+ * a patch contributed by Holger Schemel (aeglos@valinor.owl.de).
+ *
+ * In function preconditions the term "valid" applied to a pointer to
+ * a structure means that the pointer is non-NULL and the structure it
+ * points to has all fields initialized to consistent values.
+ *
+ */
+
+#include "hfsplus_fs.h"
+
+/* offsets to various blocks */
+#define HFS_DD_BLK		0 /* Driver Descriptor block */
+#define HFS_PMAP_BLK		1 /* First block of partition map */
+#define HFS_MDB_BLK		2 /* Block (w/i partition) of MDB */
+
+/* magic numbers for various disk blocks */
+#define HFS_DRVR_DESC_MAGIC	0x4552 /* "ER": driver descriptor map */
+#define HFS_OLD_PMAP_MAGIC	0x5453 /* "TS": old-type partition map */
+#define HFS_NEW_PMAP_MAGIC	0x504D /* "PM": new-type partition map */
+#define HFS_SUPER_MAGIC		0x4244 /* "BD": HFS MDB (super block) */
+#define HFS_MFS_SUPER_MAGIC	0xD2D7 /* MFS MDB (super block) */
+
+/*
+ * The new style Mac partition map
+ *
+ * For each partition on the media there is a physical block (512-byte
+ * block) containing one of these structures.  These blocks are
+ * contiguous starting at block 1.
+ */
+struct new_pmap {
+	__be16	pmSig;		/* signature */
+	__be16	reSigPad;	/* padding */
+	__be32	pmMapBlkCnt;	/* partition blocks count */
+	__be32	pmPyPartStart;	/* physical block start of partition */
+	__be32	pmPartBlkCnt;	/* physical block count of partition */
+	u8	pmPartName[32];	/* (null terminated?) string
+				   giving the name of this
+				   partition */
+	u8	pmPartType[32];	/* (null terminated?) string
+				   giving the type of this
+				   partition */
+	/* a bunch more stuff we don't need */
+} __packed;
+
+/*
+ * The old style Mac partition map
+ *
+ * The partition map consists for a 2-byte signature followed by an
+ * array of these structures.  The map is terminated with an all-zero
+ * one of these.
+ */
+struct old_pmap {
+	__be16		pdSig;	/* Signature bytes */
+	struct 	old_pmap_entry {
+		__be32	pdStart;
+		__be32	pdSize;
+		__be32	pdFSID;
+	}	pdEntry[42];
+} __packed;
+
+/*
+ * hfs_part_find()
+ *
+ * Parse the partition map looking for the
+ * start and length of the 'part'th HFS partition.
+ */
+int hfs_part_find(struct super_block *sb,
+		  sector_t *part_start, sector_t *part_size)
+{
+	struct buffer_head *bh;
+	__be16 *data;
+	int i, size, res;
+
+	res = -ENOENT;
+	bh = sb_bread512(sb, *part_start + HFS_PMAP_BLK, data);
+	if (!bh)
+		return -EIO;
+
+	switch (be16_to_cpu(*data)) {
+	case HFS_OLD_PMAP_MAGIC:
+	  {
+		struct old_pmap *pm;
+		struct old_pmap_entry *p;
+
+		pm = (struct old_pmap *)bh->b_data;
+		p = pm->pdEntry;
+		size = 42;
+		for (i = 0; i < size; p++, i++) {
+			if (p->pdStart && p->pdSize &&
+			    p->pdFSID == cpu_to_be32(0x54465331)/*"TFS1"*/ &&
+			    (HFSPLUS_SB(sb).part < 0 || HFSPLUS_SB(sb).part == i)) {
+				*part_start += be32_to_cpu(p->pdStart);
+				*part_size = be32_to_cpu(p->pdSize);
+				res = 0;
+			}
+		}
+		break;
+	  }
+	case HFS_NEW_PMAP_MAGIC:
+	  {
+		struct new_pmap *pm;
+
+		pm = (struct new_pmap *)bh->b_data;
+		size = be32_to_cpu(pm->pmMapBlkCnt);
+		for (i = 0; i < size;) {
+			if (!memcmp(pm->pmPartType,"Apple_HFS", 9) &&
+			    (HFSPLUS_SB(sb).part < 0 || HFSPLUS_SB(sb).part == i)) {
+				*part_start += be32_to_cpu(pm->pmPyPartStart);
+				*part_size = be32_to_cpu(pm->pmPartBlkCnt);
+				res = 0;
+				break;
+			}
+			brelse(bh);
+			bh = sb_bread512(sb, *part_start + HFS_PMAP_BLK + ++i, pm);
+			if (!bh)
+				return -EIO;
+			if (pm->pmSig != cpu_to_be16(HFS_NEW_PMAP_MAGIC))
+				break;
+		}
+		break;
+	  }
+	}
+	brelse(bh);
+
+	return res;
+}

fs/hfsplus/super.c

@@ -0,0 +1,499 @@
+/*
+ *  linux/fs/hfsplus/super.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/vfs.h>
+#include <linux/nls.h>
+
+static struct inode *hfsplus_alloc_inode(struct super_block *sb);
+static void hfsplus_destroy_inode(struct inode *inode);
+
+#include "hfsplus_fs.h"
+
+static void hfsplus_read_inode(struct inode *inode)
+{
+	struct hfs_find_data fd;
+	struct hfsplus_vh *vhdr;
+	int err;
+
+	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
+	init_MUTEX(&HFSPLUS_I(inode).extents_lock);
+	HFSPLUS_I(inode).flags = 0;
+	HFSPLUS_I(inode).rsrc_inode = NULL;
+	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
+
+	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
+	read_inode:
+		hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
+		err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+		if (!err)
+			err = hfsplus_cat_read_inode(inode, &fd);
+		hfs_find_exit(&fd);
+		if (err)
+			goto bad_inode;
+		return;
+	}
+	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
+	switch(inode->i_ino) {
+	case HFSPLUS_ROOT_CNID:
+		goto read_inode;
+	case HFSPLUS_EXT_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->ext_file);
+		inode->i_mapping->a_ops = &hfsplus_btree_aops;
+		break;
+	case HFSPLUS_CAT_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->cat_file);
+		inode->i_mapping->a_ops = &hfsplus_btree_aops;
+		break;
+	case HFSPLUS_ALLOC_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
+		inode->i_mapping->a_ops = &hfsplus_aops;
+		break;
+	case HFSPLUS_START_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->start_file);
+		break;
+	case HFSPLUS_ATTR_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->attr_file);
+		inode->i_mapping->a_ops = &hfsplus_btree_aops;
+		break;
+	default:
+		goto bad_inode;
+	}
+
+	return;
+
+ bad_inode:
+	make_bad_inode(inode);
+}
+
+static int hfsplus_write_inode(struct inode *inode, int unused)
+{
+	struct hfsplus_vh *vhdr;
+	int ret = 0;
+
+	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
+	hfsplus_ext_write_extent(inode);
+	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
+		return hfsplus_cat_write_inode(inode);
+	}
+	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
+	switch (inode->i_ino) {
+	case HFSPLUS_ROOT_CNID:
+		ret = hfsplus_cat_write_inode(inode);
+		break;
+	case HFSPLUS_EXT_CNID:
+		if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->ext_file);
+		hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
+		break;
+	case HFSPLUS_CAT_CNID:
+		if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->cat_file);
+		hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
+		break;
+	case HFSPLUS_ALLOC_CNID:
+		if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
+		break;
+	case HFSPLUS_START_CNID:
+		if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->start_file);
+		break;
+	case HFSPLUS_ATTR_CNID:
+		if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->attr_file);
+		hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
+		break;
+	}
+	return ret;
+}
+
+static void hfsplus_clear_inode(struct inode *inode)
+{
+	dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
+	if (HFSPLUS_IS_RSRC(inode)) {
+		HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
+		iput(HFSPLUS_I(inode).rsrc_inode);
+	}
+}
+
+static void hfsplus_write_super(struct super_block *sb)
+{
+	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
+
+	dprint(DBG_SUPER, "hfsplus_write_super\n");
+	sb->s_dirt = 0;
+	if (sb->s_flags & MS_RDONLY)
+		/* warn? */
+		return;
+
+	vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
+	vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
+	vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
+	vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
+	vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
+
+	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
+	if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
+		if (HFSPLUS_SB(sb).sect_count) {
+			struct buffer_head *bh;
+			u32 block, offset;
+
+			block = HFSPLUS_SB(sb).blockoffset;
+			block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
+			offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
+			printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
+				HFSPLUS_SB(sb).sect_count, block, offset);
+			bh = sb_bread(sb, block);
+			if (bh) {
+				vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
+				if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
+					memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
+					mark_buffer_dirty(bh);
+					brelse(bh);
+				} else
+					printk(KERN_WARNING "hfs: backup not found!\n");
+			}
+		}
+		HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
+	}
+}
+
+static void hfsplus_put_super(struct super_block *sb)
+{
+	dprint(DBG_SUPER, "hfsplus_put_super\n");
+	if (!sb->s_fs_info)
+		return;
+	if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
+		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
+
+		vhdr->modify_date = hfsp_now2mt();
+		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
+		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
+		mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
+		sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
+	}
+
+	hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
+	hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
+	iput(HFSPLUS_SB(sb).alloc_file);
+	iput(HFSPLUS_SB(sb).hidden_dir);
+	brelse(HFSPLUS_SB(sb).s_vhbh);
+	if (HFSPLUS_SB(sb).nls)
+		unload_nls(HFSPLUS_SB(sb).nls);
+	kfree(sb->s_fs_info);
+	sb->s_fs_info = NULL;
+}
+
+static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *sb = dentry->d_sb;
+
+	buf->f_type = HFSPLUS_SUPER_MAGIC;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
+	buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
+	buf->f_bavail = buf->f_bfree;
+	buf->f_files = 0xFFFFFFFF;
+	buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
+	buf->f_namelen = HFSPLUS_MAX_STRLEN;
+
+	return 0;
+}
+
+static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
+{
+	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+		return 0;
+	if (!(*flags & MS_RDONLY)) {
+		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
+		struct hfsplus_sb_info sbi;
+
+		memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
+		sbi.nls = HFSPLUS_SB(sb).nls;
+		if (!hfsplus_parse_options(data, &sbi))
+			return -EINVAL;
+
+		if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
+			printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
+			       "running fsck.hfsplus is recommended.  leaving read-only.\n");
+			sb->s_flags |= MS_RDONLY;
+			*flags |= MS_RDONLY;
+		} else if (sbi.flags & HFSPLUS_SB_FORCE) {
+			/* nothing */
+		} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
+			printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
+			sb->s_flags |= MS_RDONLY;
+			*flags |= MS_RDONLY;
+		} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
+			printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
+			sb->s_flags |= MS_RDONLY;
+			*flags |= MS_RDONLY;
+		}
+	}
+	return 0;
+}
+
+static const struct super_operations hfsplus_sops = {
+	.alloc_inode	= hfsplus_alloc_inode,
+	.destroy_inode	= hfsplus_destroy_inode,
+	.read_inode	= hfsplus_read_inode,
+	.write_inode	= hfsplus_write_inode,
+	.clear_inode	= hfsplus_clear_inode,
+	.put_super	= hfsplus_put_super,
+	.write_super	= hfsplus_write_super,
+	.statfs		= hfsplus_statfs,
+	.remount_fs	= hfsplus_remount,
+	.show_options	= hfsplus_show_options,
+};
+
+static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct hfsplus_vh *vhdr;
+	struct hfsplus_sb_info *sbi;
+	hfsplus_cat_entry entry;
+	struct hfs_find_data fd;
+	struct inode *root;
+	struct qstr str;
+	struct nls_table *nls = NULL;
+	int err = -EINVAL;
+
+	sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+
+	memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
+	sb->s_fs_info = sbi;
+	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
+	hfsplus_fill_defaults(sbi);
+	if (!hfsplus_parse_options(data, sbi)) {
+		printk(KERN_ERR "hfs: unable to parse mount options\n");
+		err = -EINVAL;
+		goto cleanup;
+	}
+
+	/* temporarily use utf8 to correctly find the hidden dir below */
+	nls = sbi->nls;
+	sbi->nls = load_nls("utf8");
+	if (!sbi->nls) {
+		printk(KERN_ERR "hfs: unable to load nls for utf8\n");
+		err = -EINVAL;
+		goto cleanup;
+	}
+
+	/* Grab the volume header */
+	if (hfsplus_read_wrapper(sb)) {
+		if (!silent)
+			printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
+		err = -EINVAL;
+		goto cleanup;
+	}
+	vhdr = HFSPLUS_SB(sb).s_vhdr;
+
+	/* Copy parts of the volume header into the superblock */
+	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
+	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
+	    be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
+		printk(KERN_ERR "hfs: wrong filesystem version\n");
+		goto cleanup;
+	}
+	HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
+	HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
+	HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
+	HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
+	HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
+	HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
+	HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
+	if (!HFSPLUS_SB(sb).data_clump_blocks)
+		HFSPLUS_SB(sb).data_clump_blocks = 1;
+	HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
+	if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
+		HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
+
+	/* Set up operations so we can load metadata */
+	sb->s_op = &hfsplus_sops;
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+
+	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
+		printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
+		       "running fsck.hfsplus is recommended.  mounting read-only.\n");
+		sb->s_flags |= MS_RDONLY;
+	} else if (sbi->flags & HFSPLUS_SB_FORCE) {
+		/* nothing */
+	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
+		printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
+		sb->s_flags |= MS_RDONLY;
+	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
+		printk(KERN_WARNING "hfs: write access to a jounaled filesystem is not supported, "
+		       "use the force option at your own risk, mounting read-only.\n");
+		sb->s_flags |= MS_RDONLY;
+	}
+	sbi->flags &= ~HFSPLUS_SB_FORCE;
+
+	/* Load metadata objects (B*Trees) */
+	HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
+	if (!HFSPLUS_SB(sb).ext_tree) {
+		printk(KERN_ERR "hfs: failed to load extents file\n");
+		goto cleanup;
+	}
+	HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
+	if (!HFSPLUS_SB(sb).cat_tree) {
+		printk(KERN_ERR "hfs: failed to load catalog file\n");
+		goto cleanup;
+	}
+
+	HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
+	if (!HFSPLUS_SB(sb).alloc_file) {
+		printk(KERN_ERR "hfs: failed to load allocation file\n");
+		goto cleanup;
+	}
+
+	/* Load the root directory */
+	root = iget(sb, HFSPLUS_ROOT_CNID);
+	sb->s_root = d_alloc_root(root);
+	if (!sb->s_root) {
+		printk(KERN_ERR "hfs: failed to load root directory\n");
+		iput(root);
+		goto cleanup;
+	}
+
+	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
+	str.name = HFSP_HIDDENDIR_NAME;
+	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+	hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
+	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
+		hfs_find_exit(&fd);
+		if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
+			goto cleanup;
+		HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
+		if (!HFSPLUS_SB(sb).hidden_dir)
+			goto cleanup;
+	} else
+		hfs_find_exit(&fd);
+
+	if (sb->s_flags & MS_RDONLY)
+		goto out;
+
+	/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
+	 * all three are registered with Apple for our use
+	 */
+	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
+	vhdr->modify_date = hfsp_now2mt();
+	vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
+	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
+	vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
+	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
+	sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
+
+	if (!HFSPLUS_SB(sb).hidden_dir) {
+		printk(KERN_DEBUG "hfs: create hidden dir...\n");
+		HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
+		hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
+				   &str, HFSPLUS_SB(sb).hidden_dir);
+		mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
+	}
+out:
+	unload_nls(sbi->nls);
+	sbi->nls = nls;
+	return 0;
+
+cleanup:
+	hfsplus_put_super(sb);
+	if (nls)
+		unload_nls(nls);
+	return err;
+}
+
+MODULE_AUTHOR("Brad Boyer");
+MODULE_DESCRIPTION("Extended Macintosh Filesystem");
+MODULE_LICENSE("GPL");
+
+static struct kmem_cache *hfsplus_inode_cachep;
+
+static struct inode *hfsplus_alloc_inode(struct super_block *sb)
+{
+	struct hfsplus_inode_info *i;
+
+	i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
+	return i ? &i->vfs_inode : NULL;
+}
+
+static void hfsplus_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
+}
+
+#define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)
+
+static int hfsplus_get_sb(struct file_system_type *fs_type,
+			  int flags, const char *dev_name, void *data,
+			  struct vfsmount *mnt)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
+			   mnt);
+}
+
+static struct file_system_type hfsplus_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "hfsplus",
+	.get_sb		= hfsplus_get_sb,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+
+static void hfsplus_init_once(void *p, struct kmem_cache *cachep, unsigned long flags)
+{
+	struct hfsplus_inode_info *i = p;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
+		inode_init_once(&i->vfs_inode);
+}
+
+static int __init init_hfsplus_fs(void)
+{
+	int err;
+
+	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
+		HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
+		hfsplus_init_once, NULL);
+	if (!hfsplus_inode_cachep)
+		return -ENOMEM;
+	err = register_filesystem(&hfsplus_fs_type);
+	if (err)
+		kmem_cache_destroy(hfsplus_inode_cachep);
+	return err;
+}
+
+static void __exit exit_hfsplus_fs(void)
+{
+	unregister_filesystem(&hfsplus_fs_type);
+	kmem_cache_destroy(hfsplus_inode_cachep);
+}
+
+module_init(init_hfsplus_fs)
+module_exit(exit_hfsplus_fs)

fs/hfsplus/unicode.c

@@ -0,0 +1,299 @@
+/*
+ *  linux/fs/hfsplus/unicode.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handler routines for unicode strings
+ */
+
+#include <linux/types.h>
+#include <linux/nls.h>
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+/* Fold the case of a unicode char, given the 16 bit value */
+/* Returns folded char, or 0 if ignorable */
+static inline u16 case_fold(u16 c)
+{
+        u16 tmp;
+
+        tmp = hfsplus_case_fold_table[c >> 8];
+        if (tmp)
+                tmp = hfsplus_case_fold_table[tmp + (c & 0xff)];
+        else
+                tmp = c;
+        return tmp;
+}
+
+/* Compare unicode strings, return values like normal strcmp */
+int hfsplus_strcasecmp(const struct hfsplus_unistr *s1,
+		       const struct hfsplus_unistr *s2)
+{
+	u16 len1, len2, c1, c2;
+	const hfsplus_unichr *p1, *p2;
+
+	len1 = be16_to_cpu(s1->length);
+	len2 = be16_to_cpu(s2->length);
+	p1 = s1->unicode;
+	p2 = s2->unicode;
+
+	while (1) {
+		c1 = c2 = 0;
+
+		while (len1 && !c1) {
+			c1 = case_fold(be16_to_cpu(*p1));
+			p1++;
+			len1--;
+		}
+		while (len2 && !c2) {
+			c2 = case_fold(be16_to_cpu(*p2));
+			p2++;
+			len2--;
+		}
+
+		if (c1 != c2)
+			return (c1 < c2) ? -1 : 1;
+		if (!c1 && !c2)
+			return 0;
+	}
+}
+
+/* Compare names as a sequence of 16-bit unsigned integers */
+int hfsplus_strcmp(const struct hfsplus_unistr *s1,
+		   const struct hfsplus_unistr *s2)
+{
+	u16 len1, len2, c1, c2;
+	const hfsplus_unichr *p1, *p2;
+	int len;
+
+	len1 = be16_to_cpu(s1->length);
+	len2 = be16_to_cpu(s2->length);
+	p1 = s1->unicode;
+	p2 = s2->unicode;
+
+	for (len = min(len1, len2); len > 0; len--) {
+		c1 = be16_to_cpu(*p1);
+		c2 = be16_to_cpu(*p2);
+		if (c1 != c2)
+			return c1 < c2 ? -1 : 1;
+		p1++;
+		p2++;
+	}
+
+	return len1 < len2 ? -1 :
+	       len1 > len2 ? 1 : 0;
+}
+
+
+#define Hangul_SBase	0xac00
+#define Hangul_LBase	0x1100
+#define Hangul_VBase	0x1161
+#define Hangul_TBase	0x11a7
+#define Hangul_SCount	11172
+#define Hangul_LCount	19
+#define Hangul_VCount	21
+#define Hangul_TCount	28
+#define Hangul_NCount	(Hangul_VCount * Hangul_TCount)
+
+
+static u16 *hfsplus_compose_lookup(u16 *p, u16 cc)
+{
+	int i, s, e;
+
+	s = 1;
+	e = p[1];
+	if (!e || cc < p[s * 2] || cc > p[e * 2])
+		return NULL;
+	do {
+		i = (s + e) / 2;
+		if (cc > p[i * 2])
+			s = i + 1;
+		else if (cc < p[i * 2])
+			e = i - 1;
+		else
+			return hfsplus_compose_table + p[i * 2 + 1];
+	} while (s <= e);
+	return NULL;
+}
+
+int hfsplus_uni2asc(struct super_block *sb, const struct hfsplus_unistr *ustr, char *astr, int *len_p)
+{
+	const hfsplus_unichr *ip;
+	struct nls_table *nls = HFSPLUS_SB(sb).nls;
+	u8 *op;
+	u16 cc, c0, c1;
+	u16 *ce1, *ce2;
+	int i, len, ustrlen, res, compose;
+
+	op = astr;
+	ip = ustr->unicode;
+	ustrlen = be16_to_cpu(ustr->length);
+	len = *len_p;
+	ce1 = NULL;
+	compose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
+
+	while (ustrlen > 0) {
+		c0 = be16_to_cpu(*ip++);
+		ustrlen--;
+		/* search for single decomposed char */
+		if (likely(compose))
+			ce1 = hfsplus_compose_lookup(hfsplus_compose_table, c0);
+		if (ce1 && (cc = ce1[0])) {
+			/* start of a possibly decomposed Hangul char */
+			if (cc != 0xffff)
+				goto done;
+			if (!ustrlen)
+				goto same;
+			c1 = be16_to_cpu(*ip) - Hangul_VBase;
+			if (c1 < Hangul_VCount) {
+				/* compose the Hangul char */
+				cc = (c0 - Hangul_LBase) * Hangul_VCount;
+				cc = (cc + c1) * Hangul_TCount;
+				cc += Hangul_SBase;
+				ip++;
+				ustrlen--;
+				if (!ustrlen)
+					goto done;
+				c1 = be16_to_cpu(*ip) - Hangul_TBase;
+				if (c1 > 0 && c1 < Hangul_TCount) {
+					cc += c1;
+					ip++;
+					ustrlen--;
+				}
+				goto done;
+			}
+		}
+		while (1) {
+			/* main loop for common case of not composed chars */
+			if (!ustrlen)
+				goto same;
+			c1 = be16_to_cpu(*ip);
+			if (likely(compose))
+				ce1 = hfsplus_compose_lookup(hfsplus_compose_table, c1);
+			if (ce1)
+				break;
+			switch (c0) {
+			case 0:
+				c0 = 0x2400;
+				break;
+			case '/':
+				c0 = ':';
+				break;
+			}
+			res = nls->uni2char(c0, op, len);
+			if (res < 0) {
+				if (res == -ENAMETOOLONG)
+					goto out;
+				*op = '?';
+				res = 1;
+			}
+			op += res;
+			len -= res;
+			c0 = c1;
+			ip++;
+			ustrlen--;
+		}
+		ce2 = hfsplus_compose_lookup(ce1, c0);
+		if (ce2) {
+			i = 1;
+			while (i < ustrlen) {
+				ce1 = hfsplus_compose_lookup(ce2, be16_to_cpu(ip[i]));
+				if (!ce1)
+					break;
+				i++;
+				ce2 = ce1;
+			}
+			if ((cc = ce2[0])) {
+				ip += i;
+				ustrlen -= i;
+				goto done;
+			}
+		}
+	same:
+		switch (c0) {
+		case 0:
+			cc = 0x2400;
+			break;
+		case '/':
+			cc = ':';
+			break;
+		default:
+			cc = c0;
+		}
+	done:
+		res = nls->uni2char(cc, op, len);
+		if (res < 0) {
+			if (res == -ENAMETOOLONG)
+				goto out;
+			*op = '?';
+			res = 1;
+		}
+		op += res;
+		len -= res;
+	}
+	res = 0;
+out:
+	*len_p = (char *)op - astr;
+	return res;
+}
+
+int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr, const char *astr, int len)
+{
+	struct nls_table *nls = HFSPLUS_SB(sb).nls;
+	int size, off, decompose;
+	wchar_t c;
+	u16 outlen = 0;
+
+	decompose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
+
+	while (outlen < HFSPLUS_MAX_STRLEN && len > 0) {
+		size = nls->char2uni(astr, len, &c);
+		if (size <= 0) {
+			c = '?';
+			size = 1;
+		}
+		astr += size;
+		len -= size;
+		switch (c) {
+		case 0x2400:
+			c = 0;
+			break;
+		case ':':
+			c = '/';
+			break;
+		}
+		if (c >= 0xc0 && decompose) {
+			off = hfsplus_decompose_table[(c >> 12) & 0xf];
+			if (!off)
+				goto done;
+			if (off == 0xffff) {
+				goto done;
+			}
+			off = hfsplus_decompose_table[off + ((c >> 8) & 0xf)];
+			if (!off)
+				goto done;
+			off = hfsplus_decompose_table[off + ((c >> 4) & 0xf)];
+			if (!off)
+				goto done;
+			off = hfsplus_decompose_table[off + (c & 0xf)];
+			size = off & 3;
+			if (!size)
+				goto done;
+			off /= 4;
+			if (outlen + size > HFSPLUS_MAX_STRLEN)
+				break;
+			do {
+				ustr->unicode[outlen++] = cpu_to_be16(hfsplus_decompose_table[off++]);
+			} while (--size > 0);
+			continue;
+		}
+	done:
+		ustr->unicode[outlen++] = cpu_to_be16(c);
+	}
+	ustr->length = cpu_to_be16(outlen);
+	if (len > 0)
+		return -ENAMETOOLONG;
+	return 0;
+}

fs/hfsplus/wrapper.c

@@ -0,0 +1,179 @@
+/*
+ *  linux/fs/hfsplus/wrapper.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of HFS wrappers around HFS+ volumes
+ */
+
+#include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <asm/unaligned.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+struct hfsplus_wd {
+	u32 ablk_size;
+	u16 ablk_start;
+	u16 embed_start;
+	u16 embed_count;
+};
+
+static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd)
+{
+	u32 extent;
+	u16 attrib;
+	__be16 sig;
+
+	sig = *(__be16 *)(bufptr + HFSP_WRAPOFF_EMBEDSIG);
+	if (sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIG) &&
+	    sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIGX))
+		return 0;
+
+	attrib = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ATTRIB));
+	if (!(attrib & HFSP_WRAP_ATTRIB_SLOCK) ||
+	   !(attrib & HFSP_WRAP_ATTRIB_SPARED))
+		return 0;
+
+	wd->ablk_size = be32_to_cpu(*(__be32 *)(bufptr + HFSP_WRAPOFF_ABLKSIZE));
+	if (wd->ablk_size < HFSPLUS_SECTOR_SIZE)
+		return 0;
+	if (wd->ablk_size % HFSPLUS_SECTOR_SIZE)
+		return 0;
+	wd->ablk_start = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ABLKSTART));
+
+	extent = be32_to_cpu(get_unaligned((__be32 *)(bufptr + HFSP_WRAPOFF_EMBEDEXT)));
+	wd->embed_start = (extent >> 16) & 0xFFFF;
+	wd->embed_count = extent & 0xFFFF;
+
+	return 1;
+}
+
+static int hfsplus_get_last_session(struct super_block *sb,
+				    sector_t *start, sector_t *size)
+{
+	struct cdrom_multisession ms_info;
+	struct cdrom_tocentry te;
+	int res;
+
+	/* default values */
+	*start = 0;
+	*size = sb->s_bdev->bd_inode->i_size >> 9;
+
+	if (HFSPLUS_SB(sb).session >= 0) {
+		te.cdte_track = HFSPLUS_SB(sb).session;
+		te.cdte_format = CDROM_LBA;
+		res = ioctl_by_bdev(sb->s_bdev, CDROMREADTOCENTRY, (unsigned long)&te);
+		if (!res && (te.cdte_ctrl & CDROM_DATA_TRACK) == 4) {
+			*start = (sector_t)te.cdte_addr.lba << 2;
+			return 0;
+		}
+		printk(KERN_ERR "hfs: invalid session number or type of track\n");
+		return -EINVAL;
+	}
+	ms_info.addr_format = CDROM_LBA;
+	res = ioctl_by_bdev(sb->s_bdev, CDROMMULTISESSION, (unsigned long)&ms_info);
+	if (!res && ms_info.xa_flag)
+		*start = (sector_t)ms_info.addr.lba << 2;
+	return 0;
+}
+
+/* Find the volume header and fill in some minimum bits in superblock */
+/* Takes in super block, returns true if good data read */
+int hfsplus_read_wrapper(struct super_block *sb)
+{
+	struct buffer_head *bh;
+	struct hfsplus_vh *vhdr;
+	struct hfsplus_wd wd;
+	sector_t part_start, part_size;
+	u32 blocksize;
+
+	blocksize = sb_min_blocksize(sb, HFSPLUS_SECTOR_SIZE);
+	if (!blocksize)
+		return -EINVAL;
+
+	if (hfsplus_get_last_session(sb, &part_start, &part_size))
+		return -EINVAL;
+	while (1) {
+		bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr);
+		if (!bh)
+			return -EIO;
+
+		if (vhdr->signature == cpu_to_be16(HFSP_WRAP_MAGIC)) {
+			if (!hfsplus_read_mdb(vhdr, &wd))
+				goto error;
+			wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT;
+			part_start += wd.ablk_start + wd.embed_start * wd.ablk_size;
+			part_size = wd.embed_count * wd.ablk_size;
+			brelse(bh);
+			bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr);
+			if (!bh)
+				return -EIO;
+		}
+		if (vhdr->signature == cpu_to_be16(HFSPLUS_VOLHEAD_SIG))
+			break;
+		if (vhdr->signature == cpu_to_be16(HFSPLUS_VOLHEAD_SIGX)) {
+			HFSPLUS_SB(sb).flags |= HFSPLUS_SB_HFSX;
+			break;
+		}
+		brelse(bh);
+
+		/* check for a partition block
+		 * (should do this only for cdrom/loop though)
+		 */
+		if (hfs_part_find(sb, &part_start, &part_size))
+			return -EINVAL;
+	}
+
+	blocksize = be32_to_cpu(vhdr->blocksize);
+	brelse(bh);
+
+	/* block size must be at least as large as a sector
+	 * and a multiple of 2
+	 */
+	if (blocksize < HFSPLUS_SECTOR_SIZE ||
+	    ((blocksize - 1) & blocksize))
+		return -EINVAL;
+	HFSPLUS_SB(sb).alloc_blksz = blocksize;
+	HFSPLUS_SB(sb).alloc_blksz_shift = 0;
+	while ((blocksize >>= 1) != 0)
+		HFSPLUS_SB(sb).alloc_blksz_shift++;
+	blocksize = min(HFSPLUS_SB(sb).alloc_blksz, (u32)PAGE_SIZE);
+
+	/* align block size to block offset */
+	while (part_start & ((blocksize >> HFSPLUS_SECTOR_SHIFT) - 1))
+		blocksize >>= 1;
+
+	if (sb_set_blocksize(sb, blocksize) != blocksize) {
+		printk(KERN_ERR "hfs: unable to set blocksize to %u!\n", blocksize);
+		return -EINVAL;
+	}
+
+	HFSPLUS_SB(sb).blockoffset = part_start >>
+			(sb->s_blocksize_bits - HFSPLUS_SECTOR_SHIFT);
+	HFSPLUS_SB(sb).sect_count = part_size;
+	HFSPLUS_SB(sb).fs_shift = HFSPLUS_SB(sb).alloc_blksz_shift -
+			sb->s_blocksize_bits;
+
+	bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr);
+	if (!bh)
+		return -EIO;
+
+	/* should still be the same... */
+	if (vhdr->signature != (HFSPLUS_SB(sb).flags & HFSPLUS_SB_HFSX ?
+				cpu_to_be16(HFSPLUS_VOLHEAD_SIGX) :
+				cpu_to_be16(HFSPLUS_VOLHEAD_SIG)))
+		goto error;
+	HFSPLUS_SB(sb).s_vhbh = bh;
+	HFSPLUS_SB(sb).s_vhdr = vhdr;
+
+	return 0;
+ error:
+	brelse(bh);
+	return -EINVAL;
+}