2 * linux/fs/adfs/dir_fplus.c
4 * Copyright (C) 1997-1999 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/version.h>
11 #include <linux/errno.h>
13 #include <linux/adfs_fs.h>
14 #include <linux/sched.h>
15 #include <linux/stat.h>
16 #include <linux/spinlock.h>
19 #include "dir_fplus.h"
22 adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
24 struct adfs_bigdirheader *h;
25 struct adfs_bigdirtail *t;
27 unsigned int blk, size;
32 block = __adfs_block_map(sb, id, 0);
34 adfs_error(sb, "dir object %X has a hole at offset 0", id);
38 dir->bh[0] = sb_bread(sb, block);
43 h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
44 size = le32_to_cpu(h->bigdirsize);
46 printk(KERN_WARNING "adfs: adfs_fplus_read: directory header size\n"
47 " does not match directory size\n");
50 if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
51 h->bigdirversion[2] != 0 || size & 2047 ||
52 h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME))
55 size >>= sb->s_blocksize_bits;
56 for (blk = 1; blk < size; blk++) {
57 block = __adfs_block_map(sb, id, blk);
59 adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
63 dir->bh[blk] = sb_bread(sb, block);
66 dir->nr_buffers = blk;
69 t = (struct adfs_bigdirtail *)(dir->bh[size - 1]->b_data + (sb->s_blocksize - 8));
71 if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
72 t->bigdirendmasseq != h->startmasseq ||
73 t->reserved[0] != 0 || t->reserved[1] != 0)
76 dir->parent_id = le32_to_cpu(h->bigdirparent);
80 for (i = 0; i < dir->nr_buffers; i++)
87 adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
89 struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
92 if (fpos <= le32_to_cpu(h->bigdirentries)) {
101 dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
103 struct super_block *sb = dir->sb;
104 unsigned int buffer, partial, remainder;
106 buffer = offset >> sb->s_blocksize_bits;
107 offset &= sb->s_blocksize - 1;
109 partial = sb->s_blocksize - offset;
112 memcpy(to, dir->bh[buffer]->b_data + offset, len);
114 char *c = (char *)to;
116 remainder = len - partial;
118 memcpy(c, dir->bh[buffer]->b_data + offset, partial);
119 memcpy(c + partial, dir->bh[buffer + 1]->b_data, remainder);
124 adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
126 struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
127 struct adfs_bigdirentry bde;
129 int i, ret = -ENOENT;
131 if (dir->pos >= le32_to_cpu(h->bigdirentries))
134 offset = offsetof(struct adfs_bigdirheader, bigdirname);
135 offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
136 offset += dir->pos * sizeof(struct adfs_bigdirentry);
138 dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
140 obj->loadaddr = le32_to_cpu(bde.bigdirload);
141 obj->execaddr = le32_to_cpu(bde.bigdirexec);
142 obj->size = le32_to_cpu(bde.bigdirlen);
143 obj->file_id = le32_to_cpu(bde.bigdirindaddr);
144 obj->attr = le32_to_cpu(bde.bigdirattr);
145 obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
147 offset = offsetof(struct adfs_bigdirheader, bigdirname);
148 offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
149 offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
150 offset += le32_to_cpu(bde.bigdirobnameptr);
152 dir_memcpy(dir, offset, obj->name, obj->name_len);
153 for (i = 0; i < obj->name_len; i++)
154 if (obj->name[i] == '/')
164 adfs_fplus_free(struct adfs_dir *dir)
168 for (i = 0; i < dir->nr_buffers; i++)
173 struct adfs_dir_ops adfs_fplus_dir_ops = {