aboutsummaryrefslogtreecommitdiff
path: root/fs/adfs/dir_fplus.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/adfs/dir_fplus.c')
-rw-r--r--fs/adfs/dir_fplus.c179
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 00000000000..1ec644e32df
--- /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
+};