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Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
1da177e4 | 10 | #include <linux/buffer_head.h> |
2f09719a | 11 | #include <linux/slab.h> |
1da177e4 LT |
12 | #include "adfs.h" |
13 | #include "dir_fplus.h" | |
14 | ||
15 | static int | |
16 | adfs_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 | ||
2f09719a SS |
26 | /* start off using fixed bh set - only alloc for big dirs */ |
27 | dir->bh_fplus = &dir->bh[0]; | |
28 | ||
1da177e4 LT |
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 | ||
2f09719a SS |
35 | dir->bh_fplus[0] = sb_bread(sb, block); |
36 | if (!dir->bh_fplus[0]) | |
1da177e4 LT |
37 | goto out; |
38 | dir->nr_buffers += 1; | |
39 | ||
2f09719a | 40 | h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data; |
1da177e4 LT |
41 | size = le32_to_cpu(h->bigdirsize); |
42 | if (size != sz) { | |
2f09719a SS |
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); | |
1da177e4 LT |
47 | } |
48 | ||
49 | if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 || | |
50 | h->bigdirversion[2] != 0 || size & 2047 || | |
2f09719a SS |
51 | h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) { |
52 | printk(KERN_WARNING "adfs: dir object %X has" | |
53 | " malformed dir header\n", id); | |
1da177e4 | 54 | goto out; |
2f09719a | 55 | } |
1da177e4 LT |
56 | |
57 | size >>= sb->s_blocksize_bits; | |
e2ffcf5c | 58 | if (size > ARRAY_SIZE(dir->bh)) { |
2f09719a SS |
59 | /* this directory is too big for fixed bh set, must allocate */ |
60 | struct buffer_head **bh_fplus = | |
b16214d4 | 61 | kcalloc(size, sizeof(struct buffer_head *), |
2f09719a SS |
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 | ||
1da177e4 LT |
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 | ||
2f09719a SS |
80 | dir->bh_fplus[blk] = sb_bread(sb, block); |
81 | if (!dir->bh_fplus[blk]) { | |
19bdd41a JP |
82 | adfs_error(sb, "dir object %x failed read for offset %d, mapped block %lX", |
83 | id, blk, block); | |
1da177e4 | 84 | goto out; |
2f09719a SS |
85 | } |
86 | ||
87 | dir->nr_buffers += 1; | |
1da177e4 LT |
88 | } |
89 | ||
2f09719a SS |
90 | t = (struct adfs_bigdirtail *) |
91 | (dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8)); | |
1da177e4 LT |
92 | |
93 | if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) || | |
94 | t->bigdirendmasseq != h->startmasseq || | |
2f09719a SS |
95 | t->reserved[0] != 0 || t->reserved[1] != 0) { |
96 | printk(KERN_WARNING "adfs: dir object %X has " | |
97 | "malformed dir end\n", id); | |
1da177e4 | 98 | goto out; |
2f09719a | 99 | } |
1da177e4 LT |
100 | |
101 | dir->parent_id = le32_to_cpu(h->bigdirparent); | |
102 | dir->sb = sb; | |
103 | return 0; | |
2f09719a | 104 | |
1da177e4 | 105 | out: |
2f09719a SS |
106 | if (dir->bh_fplus) { |
107 | for (i = 0; i < dir->nr_buffers; i++) | |
108 | brelse(dir->bh_fplus[i]); | |
109 | ||
110 | if (&dir->bh[0] != dir->bh_fplus) | |
111 | kfree(dir->bh_fplus); | |
112 | ||
113 | dir->bh_fplus = NULL; | |
114 | } | |
115 | ||
116 | dir->nr_buffers = 0; | |
1da177e4 LT |
117 | dir->sb = NULL; |
118 | return ret; | |
119 | } | |
120 | ||
121 | static int | |
122 | adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos) | |
123 | { | |
2f09719a SS |
124 | struct adfs_bigdirheader *h = |
125 | (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data; | |
1da177e4 LT |
126 | int ret = -ENOENT; |
127 | ||
128 | if (fpos <= le32_to_cpu(h->bigdirentries)) { | |
129 | dir->pos = fpos; | |
130 | ret = 0; | |
131 | } | |
132 | ||
133 | return ret; | |
134 | } | |
135 | ||
136 | static void | |
137 | dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len) | |
138 | { | |
139 | struct super_block *sb = dir->sb; | |
140 | unsigned int buffer, partial, remainder; | |
141 | ||
142 | buffer = offset >> sb->s_blocksize_bits; | |
143 | offset &= sb->s_blocksize - 1; | |
144 | ||
145 | partial = sb->s_blocksize - offset; | |
146 | ||
147 | if (partial >= len) | |
2f09719a | 148 | memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len); |
1da177e4 LT |
149 | else { |
150 | char *c = (char *)to; | |
151 | ||
152 | remainder = len - partial; | |
153 | ||
2f09719a SS |
154 | memcpy(c, |
155 | dir->bh_fplus[buffer]->b_data + offset, | |
156 | partial); | |
157 | ||
158 | memcpy(c + partial, | |
159 | dir->bh_fplus[buffer + 1]->b_data, | |
160 | remainder); | |
1da177e4 LT |
161 | } |
162 | } | |
163 | ||
164 | static int | |
165 | adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) | |
166 | { | |
2f09719a SS |
167 | struct adfs_bigdirheader *h = |
168 | (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data; | |
1da177e4 LT |
169 | struct adfs_bigdirentry bde; |
170 | unsigned int offset; | |
171 | int i, ret = -ENOENT; | |
172 | ||
173 | if (dir->pos >= le32_to_cpu(h->bigdirentries)) | |
174 | goto out; | |
175 | ||
176 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
177 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
178 | offset += dir->pos * sizeof(struct adfs_bigdirentry); | |
179 | ||
180 | dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry)); | |
181 | ||
182 | obj->loadaddr = le32_to_cpu(bde.bigdirload); | |
183 | obj->execaddr = le32_to_cpu(bde.bigdirexec); | |
184 | obj->size = le32_to_cpu(bde.bigdirlen); | |
185 | obj->file_id = le32_to_cpu(bde.bigdirindaddr); | |
186 | obj->attr = le32_to_cpu(bde.bigdirattr); | |
187 | obj->name_len = le32_to_cpu(bde.bigdirobnamelen); | |
188 | ||
189 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
190 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
191 | offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry); | |
192 | offset += le32_to_cpu(bde.bigdirobnameptr); | |
193 | ||
194 | dir_memcpy(dir, offset, obj->name, obj->name_len); | |
195 | for (i = 0; i < obj->name_len; i++) | |
196 | if (obj->name[i] == '/') | |
197 | obj->name[i] = '.'; | |
198 | ||
da23ef05 SS |
199 | obj->filetype = -1; |
200 | ||
201 | /* | |
202 | * object is a file and is filetyped and timestamped? | |
203 | * RISC OS 12-bit filetype is stored in load_address[19:8] | |
204 | */ | |
205 | if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) && | |
206 | (0xfff00000 == (0xfff00000 & obj->loadaddr))) { | |
207 | obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8); | |
208 | ||
209 | /* optionally append the ,xyz hex filetype suffix */ | |
210 | if (ADFS_SB(dir->sb)->s_ftsuffix) | |
211 | obj->name_len += | |
212 | append_filetype_suffix( | |
213 | &obj->name[obj->name_len], | |
214 | obj->filetype); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | dir->pos += 1; |
218 | ret = 0; | |
219 | out: | |
220 | return ret; | |
221 | } | |
222 | ||
ffdc9064 AV |
223 | static int |
224 | adfs_fplus_sync(struct adfs_dir *dir) | |
225 | { | |
226 | int err = 0; | |
227 | int i; | |
228 | ||
229 | for (i = dir->nr_buffers - 1; i >= 0; i--) { | |
2f09719a | 230 | struct buffer_head *bh = dir->bh_fplus[i]; |
ffdc9064 AV |
231 | sync_dirty_buffer(bh); |
232 | if (buffer_req(bh) && !buffer_uptodate(bh)) | |
233 | err = -EIO; | |
234 | } | |
235 | ||
236 | return err; | |
237 | } | |
238 | ||
1da177e4 LT |
239 | static void |
240 | adfs_fplus_free(struct adfs_dir *dir) | |
241 | { | |
242 | int i; | |
243 | ||
2f09719a SS |
244 | if (dir->bh_fplus) { |
245 | for (i = 0; i < dir->nr_buffers; i++) | |
246 | brelse(dir->bh_fplus[i]); | |
247 | ||
248 | if (&dir->bh[0] != dir->bh_fplus) | |
249 | kfree(dir->bh_fplus); | |
250 | ||
251 | dir->bh_fplus = NULL; | |
252 | } | |
253 | ||
254 | dir->nr_buffers = 0; | |
1da177e4 LT |
255 | dir->sb = NULL; |
256 | } | |
257 | ||
258 | struct adfs_dir_ops adfs_fplus_dir_ops = { | |
259 | .read = adfs_fplus_read, | |
260 | .setpos = adfs_fplus_setpos, | |
261 | .getnext = adfs_fplus_getnext, | |
ffdc9064 | 262 | .sync = adfs_fplus_sync, |
1da177e4 LT |
263 | .free = adfs_fplus_free |
264 | }; |