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1/*
2 * linux/fs/adfs/dir_fplus.c
3 *
4 * Copyright (C) 1997-1999 Russell King
5 *
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.
9 */
10#include <linux/buffer_head.h>
11#include <linux/slab.h>
12#include "adfs.h"
13#include "dir_fplus.h"
14
15static int
16adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
17{
18 struct adfs_bigdirheader *h;
19 struct adfs_bigdirtail *t;
20 unsigned long block;
21 unsigned int blk, size;
22 int i, ret = -EIO;
23
24 dir->nr_buffers = 0;
25
26 /* start off using fixed bh set - only alloc for big dirs */
27 dir->bh_fplus = &dir->bh[0];
28
29 block = __adfs_block_map(sb, id, 0);
30 if (!block) {
31 adfs_error(sb, "dir object %X has a hole at offset 0", id);
32 goto out;
33 }
34
35 dir->bh_fplus[0] = sb_bread(sb, block);
36 if (!dir->bh_fplus[0])
37 goto out;
38 dir->nr_buffers += 1;
39
40 h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data;
41 size = le32_to_cpu(h->bigdirsize);
42 if (size != sz) {
43 printk(KERN_WARNING "adfs: adfs_fplus_read:"
44 " directory header size %X\n"
45 " does not match directory size %X\n",
46 size, sz);
47 }
48
49 if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
50 h->bigdirversion[2] != 0 || size & 2047 ||
51 h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) {
52 printk(KERN_WARNING "adfs: dir object %X has"
53 " malformed dir header\n", id);
54 goto out;
55 }
56
57 size >>= sb->s_blocksize_bits;
58 if (size > sizeof(dir->bh)/sizeof(dir->bh[0])) {
59 /* this directory is too big for fixed bh set, must allocate */
60 struct buffer_head **bh_fplus =
61 kzalloc(size * sizeof(struct buffer_head *),
62 GFP_KERNEL);
63 if (!bh_fplus) {
64 adfs_error(sb, "not enough memory for"
65 " dir object %X (%d blocks)", id, size);
66 goto out;
67 }
68 dir->bh_fplus = bh_fplus;
69 /* copy over the pointer to the block that we've already read */
70 dir->bh_fplus[0] = dir->bh[0];
71 }
72
73 for (blk = 1; blk < size; blk++) {
74 block = __adfs_block_map(sb, id, blk);
75 if (!block) {
76 adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
77 goto out;
78 }
79
80 dir->bh_fplus[blk] = sb_bread(sb, block);
81 if (!dir->bh_fplus[blk]) {
82 adfs_error(sb, "dir object %X failed read for"
83 " offset %d, mapped block %X",
84 id, blk, block);
85 goto out;
86 }
87
88 dir->nr_buffers += 1;
89 }
90
91 t = (struct adfs_bigdirtail *)
92 (dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8));
93
94 if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
95 t->bigdirendmasseq != h->startmasseq ||
96 t->reserved[0] != 0 || t->reserved[1] != 0) {
97 printk(KERN_WARNING "adfs: dir object %X has "
98 "malformed dir end\n", id);
99 goto out;
100 }
101
102 dir->parent_id = le32_to_cpu(h->bigdirparent);
103 dir->sb = sb;
104 return 0;
105
106out:
107 if (dir->bh_fplus) {
108 for (i = 0; i < dir->nr_buffers; i++)
109 brelse(dir->bh_fplus[i]);
110
111 if (&dir->bh[0] != dir->bh_fplus)
112 kfree(dir->bh_fplus);
113
114 dir->bh_fplus = NULL;
115 }
116
117 dir->nr_buffers = 0;
118 dir->sb = NULL;
119 return ret;
120}
121
122static int
123adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
124{
125 struct adfs_bigdirheader *h =
126 (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
127 int ret = -ENOENT;
128
129 if (fpos <= le32_to_cpu(h->bigdirentries)) {
130 dir->pos = fpos;
131 ret = 0;
132 }
133
134 return ret;
135}
136
137static void
138dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
139{
140 struct super_block *sb = dir->sb;
141 unsigned int buffer, partial, remainder;
142
143 buffer = offset >> sb->s_blocksize_bits;
144 offset &= sb->s_blocksize - 1;
145
146 partial = sb->s_blocksize - offset;
147
148 if (partial >= len)
149 memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len);
150 else {
151 char *c = (char *)to;
152
153 remainder = len - partial;
154
155 memcpy(c,
156 dir->bh_fplus[buffer]->b_data + offset,
157 partial);
158
159 memcpy(c + partial,
160 dir->bh_fplus[buffer + 1]->b_data,
161 remainder);
162 }
163}
164
165static int
166adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
167{
168 struct adfs_bigdirheader *h =
169 (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
170 struct adfs_bigdirentry bde;
171 unsigned int offset;
172 int i, ret = -ENOENT;
173
174 if (dir->pos >= le32_to_cpu(h->bigdirentries))
175 goto out;
176
177 offset = offsetof(struct adfs_bigdirheader, bigdirname);
178 offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
179 offset += dir->pos * sizeof(struct adfs_bigdirentry);
180
181 dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
182
183 obj->loadaddr = le32_to_cpu(bde.bigdirload);
184 obj->execaddr = le32_to_cpu(bde.bigdirexec);
185 obj->size = le32_to_cpu(bde.bigdirlen);
186 obj->file_id = le32_to_cpu(bde.bigdirindaddr);
187 obj->attr = le32_to_cpu(bde.bigdirattr);
188 obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
189
190 offset = offsetof(struct adfs_bigdirheader, bigdirname);
191 offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
192 offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
193 offset += le32_to_cpu(bde.bigdirobnameptr);
194
195 dir_memcpy(dir, offset, obj->name, obj->name_len);
196 for (i = 0; i < obj->name_len; i++)
197 if (obj->name[i] == '/')
198 obj->name[i] = '.';
199
200 obj->filetype = -1;
201
202 /*
203 * object is a file and is filetyped and timestamped?
204 * RISC OS 12-bit filetype is stored in load_address[19:8]
205 */
206 if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
207 (0xfff00000 == (0xfff00000 & obj->loadaddr))) {
208 obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
209
210 /* optionally append the ,xyz hex filetype suffix */
211 if (ADFS_SB(dir->sb)->s_ftsuffix)
212 obj->name_len +=
213 append_filetype_suffix(
214 &obj->name[obj->name_len],
215 obj->filetype);
216 }
217
218 dir->pos += 1;
219 ret = 0;
220out:
221 return ret;
222}
223
224static int
225adfs_fplus_sync(struct adfs_dir *dir)
226{
227 int err = 0;
228 int i;
229
230 for (i = dir->nr_buffers - 1; i >= 0; i--) {
231 struct buffer_head *bh = dir->bh_fplus[i];
232 sync_dirty_buffer(bh);
233 if (buffer_req(bh) && !buffer_uptodate(bh))
234 err = -EIO;
235 }
236
237 return err;
238}
239
240static void
241adfs_fplus_free(struct adfs_dir *dir)
242{
243 int i;
244
245 if (dir->bh_fplus) {
246 for (i = 0; i < dir->nr_buffers; i++)
247 brelse(dir->bh_fplus[i]);
248
249 if (&dir->bh[0] != dir->bh_fplus)
250 kfree(dir->bh_fplus);
251
252 dir->bh_fplus = NULL;
253 }
254
255 dir->nr_buffers = 0;
256 dir->sb = NULL;
257}
258
259struct adfs_dir_ops adfs_fplus_dir_ops = {
260 .read = adfs_fplus_read,
261 .setpos = adfs_fplus_setpos,
262 .getnext = adfs_fplus_getnext,
263 .sync = adfs_fplus_sync,
264 .free = adfs_fplus_free
265};
1/*
2 * linux/fs/adfs/dir_fplus.c
3 *
4 * Copyright (C) 1997-1999 Russell King
5 *
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.
9 */
10#include <linux/buffer_head.h>
11#include <linux/slab.h>
12#include "adfs.h"
13#include "dir_fplus.h"
14
15static int
16adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
17{
18 struct adfs_bigdirheader *h;
19 struct adfs_bigdirtail *t;
20 unsigned long block;
21 unsigned int blk, size;
22 int i, ret = -EIO;
23
24 dir->nr_buffers = 0;
25
26 /* start off using fixed bh set - only alloc for big dirs */
27 dir->bh_fplus = &dir->bh[0];
28
29 block = __adfs_block_map(sb, id, 0);
30 if (!block) {
31 adfs_error(sb, "dir object %X has a hole at offset 0", id);
32 goto out;
33 }
34
35 dir->bh_fplus[0] = sb_bread(sb, block);
36 if (!dir->bh_fplus[0])
37 goto out;
38 dir->nr_buffers += 1;
39
40 h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data;
41 size = le32_to_cpu(h->bigdirsize);
42 if (size != sz) {
43 printk(KERN_WARNING "adfs: adfs_fplus_read:"
44 " directory header size %X\n"
45 " does not match directory size %X\n",
46 size, sz);
47 }
48
49 if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
50 h->bigdirversion[2] != 0 || size & 2047 ||
51 h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) {
52 printk(KERN_WARNING "adfs: dir object %X has"
53 " malformed dir header\n", id);
54 goto out;
55 }
56
57 size >>= sb->s_blocksize_bits;
58 if (size > sizeof(dir->bh)/sizeof(dir->bh[0])) {
59 /* this directory is too big for fixed bh set, must allocate */
60 struct buffer_head **bh_fplus =
61 kzalloc(size * sizeof(struct buffer_head *),
62 GFP_KERNEL);
63 if (!bh_fplus) {
64 adfs_error(sb, "not enough memory for"
65 " dir object %X (%d blocks)", id, size);
66 goto out;
67 }
68 dir->bh_fplus = bh_fplus;
69 /* copy over the pointer to the block that we've already read */
70 dir->bh_fplus[0] = dir->bh[0];
71 }
72
73 for (blk = 1; blk < size; blk++) {
74 block = __adfs_block_map(sb, id, blk);
75 if (!block) {
76 adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
77 goto out;
78 }
79
80 dir->bh_fplus[blk] = sb_bread(sb, block);
81 if (!dir->bh_fplus[blk]) {
82 adfs_error(sb, "dir object %X failed read for"
83 " offset %d, mapped block %X",
84 id, blk, block);
85 goto out;
86 }
87
88 dir->nr_buffers += 1;
89 }
90
91 t = (struct adfs_bigdirtail *)
92 (dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8));
93
94 if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
95 t->bigdirendmasseq != h->startmasseq ||
96 t->reserved[0] != 0 || t->reserved[1] != 0) {
97 printk(KERN_WARNING "adfs: dir object %X has "
98 "malformed dir end\n", id);
99 goto out;
100 }
101
102 dir->parent_id = le32_to_cpu(h->bigdirparent);
103 dir->sb = sb;
104 return 0;
105
106out:
107 if (dir->bh_fplus) {
108 for (i = 0; i < dir->nr_buffers; i++)
109 brelse(dir->bh_fplus[i]);
110
111 if (&dir->bh[0] != dir->bh_fplus)
112 kfree(dir->bh_fplus);
113
114 dir->bh_fplus = NULL;
115 }
116
117 dir->nr_buffers = 0;
118 dir->sb = NULL;
119 return ret;
120}
121
122static int
123adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
124{
125 struct adfs_bigdirheader *h =
126 (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
127 int ret = -ENOENT;
128
129 if (fpos <= le32_to_cpu(h->bigdirentries)) {
130 dir->pos = fpos;
131 ret = 0;
132 }
133
134 return ret;
135}
136
137static void
138dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
139{
140 struct super_block *sb = dir->sb;
141 unsigned int buffer, partial, remainder;
142
143 buffer = offset >> sb->s_blocksize_bits;
144 offset &= sb->s_blocksize - 1;
145
146 partial = sb->s_blocksize - offset;
147
148 if (partial >= len)
149 memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len);
150 else {
151 char *c = (char *)to;
152
153 remainder = len - partial;
154
155 memcpy(c,
156 dir->bh_fplus[buffer]->b_data + offset,
157 partial);
158
159 memcpy(c + partial,
160 dir->bh_fplus[buffer + 1]->b_data,
161 remainder);
162 }
163}
164
165static int
166adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
167{
168 struct adfs_bigdirheader *h =
169 (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
170 struct adfs_bigdirentry bde;
171 unsigned int offset;
172 int i, ret = -ENOENT;
173
174 if (dir->pos >= le32_to_cpu(h->bigdirentries))
175 goto out;
176
177 offset = offsetof(struct adfs_bigdirheader, bigdirname);
178 offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
179 offset += dir->pos * sizeof(struct adfs_bigdirentry);
180
181 dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
182
183 obj->loadaddr = le32_to_cpu(bde.bigdirload);
184 obj->execaddr = le32_to_cpu(bde.bigdirexec);
185 obj->size = le32_to_cpu(bde.bigdirlen);
186 obj->file_id = le32_to_cpu(bde.bigdirindaddr);
187 obj->attr = le32_to_cpu(bde.bigdirattr);
188 obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
189
190 offset = offsetof(struct adfs_bigdirheader, bigdirname);
191 offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
192 offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
193 offset += le32_to_cpu(bde.bigdirobnameptr);
194
195 dir_memcpy(dir, offset, obj->name, obj->name_len);
196 for (i = 0; i < obj->name_len; i++)
197 if (obj->name[i] == '/')
198 obj->name[i] = '.';
199
200 obj->filetype = -1;
201
202 /*
203 * object is a file and is filetyped and timestamped?
204 * RISC OS 12-bit filetype is stored in load_address[19:8]
205 */
206 if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
207 (0xfff00000 == (0xfff00000 & obj->loadaddr))) {
208 obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
209
210 /* optionally append the ,xyz hex filetype suffix */
211 if (ADFS_SB(dir->sb)->s_ftsuffix)
212 obj->name_len +=
213 append_filetype_suffix(
214 &obj->name[obj->name_len],
215 obj->filetype);
216 }
217
218 dir->pos += 1;
219 ret = 0;
220out:
221 return ret;
222}
223
224static int
225adfs_fplus_sync(struct adfs_dir *dir)
226{
227 int err = 0;
228 int i;
229
230 for (i = dir->nr_buffers - 1; i >= 0; i--) {
231 struct buffer_head *bh = dir->bh_fplus[i];
232 sync_dirty_buffer(bh);
233 if (buffer_req(bh) && !buffer_uptodate(bh))
234 err = -EIO;
235 }
236
237 return err;
238}
239
240static void
241adfs_fplus_free(struct adfs_dir *dir)
242{
243 int i;
244
245 if (dir->bh_fplus) {
246 for (i = 0; i < dir->nr_buffers; i++)
247 brelse(dir->bh_fplus[i]);
248
249 if (&dir->bh[0] != dir->bh_fplus)
250 kfree(dir->bh_fplus);
251
252 dir->bh_fplus = NULL;
253 }
254
255 dir->nr_buffers = 0;
256 dir->sb = NULL;
257}
258
259struct adfs_dir_ops adfs_fplus_dir_ops = {
260 .read = adfs_fplus_read,
261 .setpos = adfs_fplus_setpos,
262 .getnext = adfs_fplus_getnext,
263 .sync = adfs_fplus_sync,
264 .free = adfs_fplus_free
265};