Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/adfs/dir_fplus.c | |
4 | * | |
5 | * Copyright (C) 1997-1999 Russell King | |
1da177e4 | 6 | */ |
2f09719a | 7 | #include <linux/slab.h> |
1da177e4 LT |
8 | #include "adfs.h" |
9 | #include "dir_fplus.h" | |
10 | ||
11 | static int | |
12 | adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir) | |
13 | { | |
14 | struct adfs_bigdirheader *h; | |
15 | struct adfs_bigdirtail *t; | |
16 | unsigned long block; | |
17 | unsigned int blk, size; | |
18 | int i, ret = -EIO; | |
19 | ||
20 | dir->nr_buffers = 0; | |
21 | ||
2f09719a SS |
22 | /* start off using fixed bh set - only alloc for big dirs */ |
23 | dir->bh_fplus = &dir->bh[0]; | |
24 | ||
1da177e4 LT |
25 | block = __adfs_block_map(sb, id, 0); |
26 | if (!block) { | |
27 | adfs_error(sb, "dir object %X has a hole at offset 0", id); | |
28 | goto out; | |
29 | } | |
30 | ||
2f09719a SS |
31 | dir->bh_fplus[0] = sb_bread(sb, block); |
32 | if (!dir->bh_fplus[0]) | |
1da177e4 LT |
33 | goto out; |
34 | dir->nr_buffers += 1; | |
35 | ||
2f09719a | 36 | h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data; |
1da177e4 LT |
37 | size = le32_to_cpu(h->bigdirsize); |
38 | if (size != sz) { | |
ceb3b106 RK |
39 | adfs_msg(sb, KERN_WARNING, |
40 | "directory header size %X does not match directory size %X", | |
41 | size, sz); | |
1da177e4 LT |
42 | } |
43 | ||
44 | if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 || | |
45 | h->bigdirversion[2] != 0 || size & 2047 || | |
2f09719a | 46 | h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) { |
ceb3b106 | 47 | adfs_error(sb, "dir %06x has malformed header", id); |
1da177e4 | 48 | goto out; |
2f09719a | 49 | } |
1da177e4 LT |
50 | |
51 | size >>= sb->s_blocksize_bits; | |
e2ffcf5c | 52 | if (size > ARRAY_SIZE(dir->bh)) { |
2f09719a SS |
53 | /* this directory is too big for fixed bh set, must allocate */ |
54 | struct buffer_head **bh_fplus = | |
b16214d4 | 55 | kcalloc(size, sizeof(struct buffer_head *), |
2f09719a SS |
56 | GFP_KERNEL); |
57 | if (!bh_fplus) { | |
ceb3b106 RK |
58 | adfs_msg(sb, KERN_ERR, |
59 | "not enough memory for dir object %X (%d blocks)", | |
60 | id, size); | |
b7964106 | 61 | ret = -ENOMEM; |
2f09719a SS |
62 | goto out; |
63 | } | |
64 | dir->bh_fplus = bh_fplus; | |
65 | /* copy over the pointer to the block that we've already read */ | |
66 | dir->bh_fplus[0] = dir->bh[0]; | |
67 | } | |
68 | ||
1da177e4 LT |
69 | for (blk = 1; blk < size; blk++) { |
70 | block = __adfs_block_map(sb, id, blk); | |
71 | if (!block) { | |
72 | adfs_error(sb, "dir object %X has a hole at offset %d", id, blk); | |
73 | goto out; | |
74 | } | |
75 | ||
2f09719a SS |
76 | dir->bh_fplus[blk] = sb_bread(sb, block); |
77 | if (!dir->bh_fplus[blk]) { | |
19bdd41a JP |
78 | adfs_error(sb, "dir object %x failed read for offset %d, mapped block %lX", |
79 | id, blk, block); | |
1da177e4 | 80 | goto out; |
2f09719a SS |
81 | } |
82 | ||
83 | dir->nr_buffers += 1; | |
1da177e4 LT |
84 | } |
85 | ||
2f09719a SS |
86 | t = (struct adfs_bigdirtail *) |
87 | (dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8)); | |
1da177e4 LT |
88 | |
89 | if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) || | |
90 | t->bigdirendmasseq != h->startmasseq || | |
2f09719a | 91 | t->reserved[0] != 0 || t->reserved[1] != 0) { |
ceb3b106 | 92 | adfs_error(sb, "dir %06x has malformed tail", id); |
1da177e4 | 93 | goto out; |
2f09719a | 94 | } |
1da177e4 LT |
95 | |
96 | dir->parent_id = le32_to_cpu(h->bigdirparent); | |
97 | dir->sb = sb; | |
98 | return 0; | |
2f09719a | 99 | |
1da177e4 | 100 | out: |
2f09719a SS |
101 | if (dir->bh_fplus) { |
102 | for (i = 0; i < dir->nr_buffers; i++) | |
103 | brelse(dir->bh_fplus[i]); | |
104 | ||
105 | if (&dir->bh[0] != dir->bh_fplus) | |
106 | kfree(dir->bh_fplus); | |
107 | ||
108 | dir->bh_fplus = NULL; | |
109 | } | |
110 | ||
111 | dir->nr_buffers = 0; | |
1da177e4 LT |
112 | dir->sb = NULL; |
113 | return ret; | |
114 | } | |
115 | ||
116 | static int | |
117 | adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos) | |
118 | { | |
2f09719a SS |
119 | struct adfs_bigdirheader *h = |
120 | (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data; | |
1da177e4 LT |
121 | int ret = -ENOENT; |
122 | ||
123 | if (fpos <= le32_to_cpu(h->bigdirentries)) { | |
124 | dir->pos = fpos; | |
125 | ret = 0; | |
126 | } | |
127 | ||
128 | return ret; | |
129 | } | |
130 | ||
131 | static void | |
132 | dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len) | |
133 | { | |
134 | struct super_block *sb = dir->sb; | |
135 | unsigned int buffer, partial, remainder; | |
136 | ||
137 | buffer = offset >> sb->s_blocksize_bits; | |
138 | offset &= sb->s_blocksize - 1; | |
139 | ||
140 | partial = sb->s_blocksize - offset; | |
141 | ||
142 | if (partial >= len) | |
2f09719a | 143 | memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len); |
1da177e4 LT |
144 | else { |
145 | char *c = (char *)to; | |
146 | ||
147 | remainder = len - partial; | |
148 | ||
2f09719a SS |
149 | memcpy(c, |
150 | dir->bh_fplus[buffer]->b_data + offset, | |
151 | partial); | |
152 | ||
153 | memcpy(c + partial, | |
154 | dir->bh_fplus[buffer + 1]->b_data, | |
155 | remainder); | |
1da177e4 LT |
156 | } |
157 | } | |
158 | ||
159 | static int | |
160 | adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) | |
161 | { | |
2f09719a SS |
162 | struct adfs_bigdirheader *h = |
163 | (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data; | |
1da177e4 LT |
164 | struct adfs_bigdirentry bde; |
165 | unsigned int offset; | |
adb514a4 | 166 | int ret = -ENOENT; |
1da177e4 LT |
167 | |
168 | if (dir->pos >= le32_to_cpu(h->bigdirentries)) | |
169 | goto out; | |
170 | ||
171 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
172 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
173 | offset += dir->pos * sizeof(struct adfs_bigdirentry); | |
174 | ||
175 | dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry)); | |
176 | ||
177 | obj->loadaddr = le32_to_cpu(bde.bigdirload); | |
178 | obj->execaddr = le32_to_cpu(bde.bigdirexec); | |
179 | obj->size = le32_to_cpu(bde.bigdirlen); | |
5ed70bb4 | 180 | obj->indaddr = le32_to_cpu(bde.bigdirindaddr); |
1da177e4 LT |
181 | obj->attr = le32_to_cpu(bde.bigdirattr); |
182 | obj->name_len = le32_to_cpu(bde.bigdirobnamelen); | |
183 | ||
184 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
185 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
186 | offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry); | |
187 | offset += le32_to_cpu(bde.bigdirobnameptr); | |
188 | ||
189 | dir_memcpy(dir, offset, obj->name, obj->name_len); | |
411c49bc | 190 | adfs_object_fixup(dir, obj); |
da23ef05 | 191 | |
1da177e4 LT |
192 | dir->pos += 1; |
193 | ret = 0; | |
194 | out: | |
195 | return ret; | |
196 | } | |
197 | ||
ffdc9064 AV |
198 | static int |
199 | adfs_fplus_sync(struct adfs_dir *dir) | |
200 | { | |
201 | int err = 0; | |
202 | int i; | |
203 | ||
204 | for (i = dir->nr_buffers - 1; i >= 0; i--) { | |
2f09719a | 205 | struct buffer_head *bh = dir->bh_fplus[i]; |
ffdc9064 AV |
206 | sync_dirty_buffer(bh); |
207 | if (buffer_req(bh) && !buffer_uptodate(bh)) | |
208 | err = -EIO; | |
209 | } | |
210 | ||
211 | return err; | |
212 | } | |
213 | ||
1da177e4 LT |
214 | static void |
215 | adfs_fplus_free(struct adfs_dir *dir) | |
216 | { | |
217 | int i; | |
218 | ||
2f09719a SS |
219 | if (dir->bh_fplus) { |
220 | for (i = 0; i < dir->nr_buffers; i++) | |
221 | brelse(dir->bh_fplus[i]); | |
222 | ||
223 | if (&dir->bh[0] != dir->bh_fplus) | |
224 | kfree(dir->bh_fplus); | |
225 | ||
226 | dir->bh_fplus = NULL; | |
227 | } | |
228 | ||
229 | dir->nr_buffers = 0; | |
1da177e4 LT |
230 | dir->sb = NULL; |
231 | } | |
232 | ||
0125f504 | 233 | const struct adfs_dir_ops adfs_fplus_dir_ops = { |
1da177e4 LT |
234 | .read = adfs_fplus_read, |
235 | .setpos = adfs_fplus_setpos, | |
236 | .getnext = adfs_fplus_getnext, | |
ffdc9064 | 237 | .sync = adfs_fplus_sync, |
1da177e4 LT |
238 | .free = adfs_fplus_free |
239 | }; |