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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 | */ | |
2f09719a | 10 | #include <linux/slab.h> |
1da177e4 LT |
11 | #include "adfs.h" |
12 | #include "dir_fplus.h" | |
13 | ||
14 | static int | |
15 | adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir) | |
16 | { | |
17 | struct adfs_bigdirheader *h; | |
18 | struct adfs_bigdirtail *t; | |
19 | unsigned long block; | |
20 | unsigned int blk, size; | |
21 | int i, ret = -EIO; | |
22 | ||
23 | dir->nr_buffers = 0; | |
24 | ||
2f09719a SS |
25 | /* start off using fixed bh set - only alloc for big dirs */ |
26 | dir->bh_fplus = &dir->bh[0]; | |
27 | ||
1da177e4 LT |
28 | block = __adfs_block_map(sb, id, 0); |
29 | if (!block) { | |
30 | adfs_error(sb, "dir object %X has a hole at offset 0", id); | |
31 | goto out; | |
32 | } | |
33 | ||
2f09719a SS |
34 | dir->bh_fplus[0] = sb_bread(sb, block); |
35 | if (!dir->bh_fplus[0]) | |
1da177e4 LT |
36 | goto out; |
37 | dir->nr_buffers += 1; | |
38 | ||
2f09719a | 39 | h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data; |
1da177e4 LT |
40 | size = le32_to_cpu(h->bigdirsize); |
41 | if (size != sz) { | |
ceb3b106 RK |
42 | adfs_msg(sb, KERN_WARNING, |
43 | "directory header size %X does not match directory size %X", | |
44 | size, sz); | |
1da177e4 LT |
45 | } |
46 | ||
47 | if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 || | |
48 | h->bigdirversion[2] != 0 || size & 2047 || | |
2f09719a | 49 | h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) { |
ceb3b106 | 50 | adfs_error(sb, "dir %06x has malformed header", id); |
1da177e4 | 51 | goto out; |
2f09719a | 52 | } |
1da177e4 LT |
53 | |
54 | size >>= sb->s_blocksize_bits; | |
e2ffcf5c | 55 | if (size > ARRAY_SIZE(dir->bh)) { |
2f09719a SS |
56 | /* this directory is too big for fixed bh set, must allocate */ |
57 | struct buffer_head **bh_fplus = | |
b16214d4 | 58 | kcalloc(size, sizeof(struct buffer_head *), |
2f09719a SS |
59 | GFP_KERNEL); |
60 | if (!bh_fplus) { | |
ceb3b106 RK |
61 | adfs_msg(sb, KERN_ERR, |
62 | "not enough memory for dir object %X (%d blocks)", | |
63 | id, size); | |
b7964106 | 64 | ret = -ENOMEM; |
2f09719a SS |
65 | goto out; |
66 | } | |
67 | dir->bh_fplus = bh_fplus; | |
68 | /* copy over the pointer to the block that we've already read */ | |
69 | dir->bh_fplus[0] = dir->bh[0]; | |
70 | } | |
71 | ||
1da177e4 LT |
72 | for (blk = 1; blk < size; blk++) { |
73 | block = __adfs_block_map(sb, id, blk); | |
74 | if (!block) { | |
75 | adfs_error(sb, "dir object %X has a hole at offset %d", id, blk); | |
76 | goto out; | |
77 | } | |
78 | ||
2f09719a SS |
79 | dir->bh_fplus[blk] = sb_bread(sb, block); |
80 | if (!dir->bh_fplus[blk]) { | |
19bdd41a JP |
81 | adfs_error(sb, "dir object %x failed read for offset %d, mapped block %lX", |
82 | id, blk, block); | |
1da177e4 | 83 | goto out; |
2f09719a SS |
84 | } |
85 | ||
86 | dir->nr_buffers += 1; | |
1da177e4 LT |
87 | } |
88 | ||
2f09719a SS |
89 | t = (struct adfs_bigdirtail *) |
90 | (dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8)); | |
1da177e4 LT |
91 | |
92 | if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) || | |
93 | t->bigdirendmasseq != h->startmasseq || | |
2f09719a | 94 | t->reserved[0] != 0 || t->reserved[1] != 0) { |
ceb3b106 | 95 | adfs_error(sb, "dir %06x has malformed tail", id); |
1da177e4 | 96 | goto out; |
2f09719a | 97 | } |
1da177e4 LT |
98 | |
99 | dir->parent_id = le32_to_cpu(h->bigdirparent); | |
100 | dir->sb = sb; | |
101 | return 0; | |
2f09719a | 102 | |
1da177e4 | 103 | out: |
2f09719a SS |
104 | if (dir->bh_fplus) { |
105 | for (i = 0; i < dir->nr_buffers; i++) | |
106 | brelse(dir->bh_fplus[i]); | |
107 | ||
108 | if (&dir->bh[0] != dir->bh_fplus) | |
109 | kfree(dir->bh_fplus); | |
110 | ||
111 | dir->bh_fplus = NULL; | |
112 | } | |
113 | ||
114 | dir->nr_buffers = 0; | |
1da177e4 LT |
115 | dir->sb = NULL; |
116 | return ret; | |
117 | } | |
118 | ||
119 | static int | |
120 | adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos) | |
121 | { | |
2f09719a SS |
122 | struct adfs_bigdirheader *h = |
123 | (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data; | |
1da177e4 LT |
124 | int ret = -ENOENT; |
125 | ||
126 | if (fpos <= le32_to_cpu(h->bigdirentries)) { | |
127 | dir->pos = fpos; | |
128 | ret = 0; | |
129 | } | |
130 | ||
131 | return ret; | |
132 | } | |
133 | ||
134 | static void | |
135 | dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len) | |
136 | { | |
137 | struct super_block *sb = dir->sb; | |
138 | unsigned int buffer, partial, remainder; | |
139 | ||
140 | buffer = offset >> sb->s_blocksize_bits; | |
141 | offset &= sb->s_blocksize - 1; | |
142 | ||
143 | partial = sb->s_blocksize - offset; | |
144 | ||
145 | if (partial >= len) | |
2f09719a | 146 | memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len); |
1da177e4 LT |
147 | else { |
148 | char *c = (char *)to; | |
149 | ||
150 | remainder = len - partial; | |
151 | ||
2f09719a SS |
152 | memcpy(c, |
153 | dir->bh_fplus[buffer]->b_data + offset, | |
154 | partial); | |
155 | ||
156 | memcpy(c + partial, | |
157 | dir->bh_fplus[buffer + 1]->b_data, | |
158 | remainder); | |
1da177e4 LT |
159 | } |
160 | } | |
161 | ||
162 | static int | |
163 | adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) | |
164 | { | |
2f09719a SS |
165 | struct adfs_bigdirheader *h = |
166 | (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data; | |
1da177e4 LT |
167 | struct adfs_bigdirentry bde; |
168 | unsigned int offset; | |
adb514a4 | 169 | int ret = -ENOENT; |
1da177e4 LT |
170 | |
171 | if (dir->pos >= le32_to_cpu(h->bigdirentries)) | |
172 | goto out; | |
173 | ||
174 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
175 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
176 | offset += dir->pos * sizeof(struct adfs_bigdirentry); | |
177 | ||
178 | dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry)); | |
179 | ||
180 | obj->loadaddr = le32_to_cpu(bde.bigdirload); | |
181 | obj->execaddr = le32_to_cpu(bde.bigdirexec); | |
182 | obj->size = le32_to_cpu(bde.bigdirlen); | |
183 | obj->file_id = le32_to_cpu(bde.bigdirindaddr); | |
184 | obj->attr = le32_to_cpu(bde.bigdirattr); | |
185 | obj->name_len = le32_to_cpu(bde.bigdirobnamelen); | |
186 | ||
187 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
188 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
189 | offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry); | |
190 | offset += le32_to_cpu(bde.bigdirobnameptr); | |
191 | ||
192 | dir_memcpy(dir, offset, obj->name, obj->name_len); | |
411c49bc | 193 | adfs_object_fixup(dir, obj); |
da23ef05 | 194 | |
1da177e4 LT |
195 | dir->pos += 1; |
196 | ret = 0; | |
197 | out: | |
198 | return ret; | |
199 | } | |
200 | ||
ffdc9064 AV |
201 | static int |
202 | adfs_fplus_sync(struct adfs_dir *dir) | |
203 | { | |
204 | int err = 0; | |
205 | int i; | |
206 | ||
207 | for (i = dir->nr_buffers - 1; i >= 0; i--) { | |
2f09719a | 208 | struct buffer_head *bh = dir->bh_fplus[i]; |
ffdc9064 AV |
209 | sync_dirty_buffer(bh); |
210 | if (buffer_req(bh) && !buffer_uptodate(bh)) | |
211 | err = -EIO; | |
212 | } | |
213 | ||
214 | return err; | |
215 | } | |
216 | ||
1da177e4 LT |
217 | static void |
218 | adfs_fplus_free(struct adfs_dir *dir) | |
219 | { | |
220 | int i; | |
221 | ||
2f09719a SS |
222 | if (dir->bh_fplus) { |
223 | for (i = 0; i < dir->nr_buffers; i++) | |
224 | brelse(dir->bh_fplus[i]); | |
225 | ||
226 | if (&dir->bh[0] != dir->bh_fplus) | |
227 | kfree(dir->bh_fplus); | |
228 | ||
229 | dir->bh_fplus = NULL; | |
230 | } | |
231 | ||
232 | dir->nr_buffers = 0; | |
1da177e4 LT |
233 | dir->sb = NULL; |
234 | } | |
235 | ||
0125f504 | 236 | const struct adfs_dir_ops adfs_fplus_dir_ops = { |
1da177e4 LT |
237 | .read = adfs_fplus_read, |
238 | .setpos = adfs_fplus_setpos, | |
239 | .getnext = adfs_fplus_getnext, | |
ffdc9064 | 240 | .sync = adfs_fplus_sync, |
1da177e4 LT |
241 | .free = adfs_fplus_free |
242 | }; |