Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 327 insertions, 0 deletions

diff --git a/fs/hfs/btree.c b/fs/hfs/btree.c
new file mode 100644
index 000000000000..394725efa1c8
--- /dev/null
+++ b/fs/hfs/btree.c
@@ -0,0 +1,327 @@
+/*
+ *  linux/fs/hfs/btree.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handle opening/closing btree
+ */
+
+#include <linux/pagemap.h>
+
+#include "btree.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, btree_keycmp keycmp)
+{
+        struct hfs_btree *tree;
+        struct hfs_btree_header_rec *head;
+        struct address_space *mapping;
+        struct page *page;
+        unsigned int size;
+
+        tree = kmalloc(sizeof(*tree), GFP_KERNEL);
+        if (!tree)
+                return NULL;
+        memset(tree, 0, sizeof(*tree));
+
+        init_MUTEX(&tree->tree_lock);
+        spin_lock_init(&tree->hash_lock);
+        /* Set the correct compare function */
+        tree->sb = sb;
+        tree->cnid = id;
+        tree->keycmp = keycmp;
+
+        tree->inode = iget_locked(sb, id);
+        if (!tree->inode)
+                goto free_tree;
+        if (!(tree->inode->i_state & I_NEW))
+                BUG();
+        {
+        struct hfs_mdb *mdb = HFS_SB(sb)->mdb;
+        HFS_I(tree->inode)->flags = 0;
+        init_MUTEX(&HFS_I(tree->inode)->extents_lock);
+        switch (id) {
+        case HFS_EXT_CNID:
+                hfs_inode_read_fork(tree->inode, mdb->drXTExtRec, mdb->drXTFlSize,
+                                    mdb->drXTFlSize, be32_to_cpu(mdb->drXTClpSiz));
+                tree->inode->i_mapping->a_ops = &hfs_btree_aops;
+                break;
+        case HFS_CAT_CNID:
+                hfs_inode_read_fork(tree->inode, mdb->drCTExtRec, mdb->drCTFlSize,
+                                    mdb->drCTFlSize, be32_to_cpu(mdb->drCTClpSiz));
+                tree->inode->i_mapping->a_ops = &hfs_btree_aops;
+                break;
+        default:
+                BUG();
+        }
+        }
+        unlock_new_inode(tree->inode);
+
+        mapping = tree->inode->i_mapping;
+        page = read_cache_page(mapping, 0, (filler_t *)mapping->a_ops->readpage, 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);
+
+        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 = &hfs_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("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;
+
+        if (!tree->free_nodes)
+                panic("FIXME!!!");
+        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 = hfs_extend_file(inode);
+                if (res)
+                        return ERR_PTR(res);
+                HFS_I(inode)->phys_size = inode->i_size =
+                                (loff_t)HFS_I(inode)->alloc_blocks *
+                                HFS_SB(tree->sb)->alloc_blksz;
+                HFS_I(inode)->fs_blocks = inode->i_size >>
+                                          tree->sb->s_blocksize_bits;
+                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("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);
+        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("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("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("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);
+}