1 files changed, 179 insertions, 0 deletions

diff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c
new file mode 100644
index 000000000000..1ec644e32df9
--- /dev/null
+++ b/fs/adfs/dir_fplus.c
@@ -0,0 +1,179 @@
+/*
+ *  linux/fs/adfs/dir_fplus.c
+ *
+ *  Copyright (C) 1997-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/adfs_fs.h>
+#include <linux/time.h>
+#include <linux/stat.h>
+#include <linux/spinlock.h>
+#include <linux/buffer_head.h>
+#include <linux/string.h>
+
+#include "adfs.h"
+#include "dir_fplus.h"
+
+static int
+adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
+{
+        struct adfs_bigdirheader *h;
+        struct adfs_bigdirtail *t;
+        unsigned long block;
+        unsigned int blk, size;
+        int i, ret = -EIO;
+
+        dir->nr_buffers = 0;
+
+        block = __adfs_block_map(sb, id, 0);
+        if (!block) {
+                adfs_error(sb, "dir object %X has a hole at offset 0", id);
+                goto out;
+        }
+
+        dir->bh[0] = sb_bread(sb, block);
+        if (!dir->bh[0])
+                goto out;
+        dir->nr_buffers += 1;
+
+        h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
+        size = le32_to_cpu(h->bigdirsize);
+        if (size != sz) {
+                printk(KERN_WARNING "adfs: adfs_fplus_read: directory header size\n"
+                                " does not match directory size\n");
+        }
+
+        if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
+            h->bigdirversion[2] != 0 || size & 2047 ||
+            h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME))
+                goto out;
+
+        size >>= sb->s_blocksize_bits;
+        for (blk = 1; blk < size; blk++) {
+                block = __adfs_block_map(sb, id, blk);
+                if (!block) {
+                        adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
+                        goto out;
+                }
+
+                dir->bh[blk] = sb_bread(sb, block);
+                if (!dir->bh[blk])
+                        goto out;
+                dir->nr_buffers = blk;
+        }
+
+        t = (struct adfs_bigdirtail *)(dir->bh[size - 1]->b_data + (sb->s_blocksize - 8));
+
+        if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
+            t->bigdirendmasseq != h->startmasseq ||
+            t->reserved[0] != 0 || t->reserved[1] != 0)
+                goto out;
+
+        dir->parent_id = le32_to_cpu(h->bigdirparent);
+        dir->sb = sb;
+        return 0;
+out:
+        for (i = 0; i < dir->nr_buffers; i++)
+                brelse(dir->bh[i]);
+        dir->sb = NULL;
+        return ret;
+}
+
+static int
+adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
+{
+        struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
+        int ret = -ENOENT;
+
+        if (fpos <= le32_to_cpu(h->bigdirentries)) {
+                dir->pos = fpos;
+                ret = 0;
+        }
+
+        return ret;
+}
+
+static void
+dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
+{
+        struct super_block *sb = dir->sb;
+        unsigned int buffer, partial, remainder;
+
+        buffer = offset >> sb->s_blocksize_bits;
+        offset &= sb->s_blocksize - 1;
+
+        partial = sb->s_blocksize - offset;
+
+        if (partial >= len)
+                memcpy(to, dir->bh[buffer]->b_data + offset, len);
+        else {
+                char *c = (char *)to;
+
+                remainder = len - partial;
+
+                memcpy(c, dir->bh[buffer]->b_data + offset, partial);
+                memcpy(c + partial, dir->bh[buffer + 1]->b_data, remainder);
+        }
+}
+
+static int
+adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
+{
+        struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
+        struct adfs_bigdirentry bde;
+        unsigned int offset;
+        int i, ret = -ENOENT;
+
+        if (dir->pos >= le32_to_cpu(h->bigdirentries))
+                goto out;
+
+        offset = offsetof(struct adfs_bigdirheader, bigdirname);
+        offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
+        offset += dir->pos * sizeof(struct adfs_bigdirentry);
+
+        dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
+
+        obj->loadaddr = le32_to_cpu(bde.bigdirload);
+        obj->execaddr = le32_to_cpu(bde.bigdirexec);
+        obj->size     = le32_to_cpu(bde.bigdirlen);
+        obj->file_id  = le32_to_cpu(bde.bigdirindaddr);
+        obj->attr     = le32_to_cpu(bde.bigdirattr);
+        obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
+
+        offset = offsetof(struct adfs_bigdirheader, bigdirname);
+        offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
+        offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
+        offset += le32_to_cpu(bde.bigdirobnameptr);
+
+        dir_memcpy(dir, offset, obj->name, obj->name_len);
+        for (i = 0; i < obj->name_len; i++)
+                if (obj->name[i] == '/')
+                        obj->name[i] = '.';
+
+        dir->pos += 1;
+        ret = 0;
+out:
+        return ret;
+}
+
+static void
+adfs_fplus_free(struct adfs_dir *dir)
+{
+        int i;
+
+        for (i = 0; i < dir->nr_buffers; i++)
+                brelse(dir->bh[i]);
+        dir->sb = NULL;
+}
+
+struct adfs_dir_ops adfs_fplus_dir_ops = {
+        .read           = adfs_fplus_read,
+        .setpos         = adfs_fplus_setpos,
+        .getnext        = adfs_fplus_getnext,
+        .free           = adfs_fplus_free
+};