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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; | |
1dd9f5ba | 18 | int ret = -EIO; |
1da177e4 | 19 | |
1da177e4 LT |
20 | block = __adfs_block_map(sb, id, 0); |
21 | if (!block) { | |
22 | adfs_error(sb, "dir object %X has a hole at offset 0", id); | |
23 | goto out; | |
24 | } | |
25 | ||
71b26127 RK |
26 | dir->bhs[0] = sb_bread(sb, block); |
27 | if (!dir->bhs[0]) | |
1da177e4 LT |
28 | goto out; |
29 | dir->nr_buffers += 1; | |
30 | ||
71b26127 | 31 | h = (struct adfs_bigdirheader *)dir->bhs[0]->b_data; |
1da177e4 LT |
32 | size = le32_to_cpu(h->bigdirsize); |
33 | if (size != sz) { | |
ceb3b106 RK |
34 | adfs_msg(sb, KERN_WARNING, |
35 | "directory header size %X does not match directory size %X", | |
36 | size, sz); | |
1da177e4 LT |
37 | } |
38 | ||
39 | if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 || | |
40 | h->bigdirversion[2] != 0 || size & 2047 || | |
2f09719a | 41 | h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) { |
ceb3b106 | 42 | adfs_error(sb, "dir %06x has malformed header", id); |
1da177e4 | 43 | goto out; |
2f09719a | 44 | } |
1da177e4 LT |
45 | |
46 | size >>= sb->s_blocksize_bits; | |
e2ffcf5c | 47 | if (size > ARRAY_SIZE(dir->bh)) { |
2f09719a | 48 | /* this directory is too big for fixed bh set, must allocate */ |
71b26127 | 49 | struct buffer_head **bhs = |
b16214d4 | 50 | kcalloc(size, sizeof(struct buffer_head *), |
2f09719a | 51 | GFP_KERNEL); |
71b26127 | 52 | if (!bhs) { |
ceb3b106 RK |
53 | adfs_msg(sb, KERN_ERR, |
54 | "not enough memory for dir object %X (%d blocks)", | |
55 | id, size); | |
b7964106 | 56 | ret = -ENOMEM; |
2f09719a SS |
57 | goto out; |
58 | } | |
71b26127 | 59 | dir->bhs = bhs; |
2f09719a | 60 | /* copy over the pointer to the block that we've already read */ |
71b26127 | 61 | dir->bhs[0] = dir->bh[0]; |
2f09719a SS |
62 | } |
63 | ||
1da177e4 LT |
64 | for (blk = 1; blk < size; blk++) { |
65 | block = __adfs_block_map(sb, id, blk); | |
66 | if (!block) { | |
67 | adfs_error(sb, "dir object %X has a hole at offset %d", id, blk); | |
68 | goto out; | |
69 | } | |
70 | ||
71b26127 RK |
71 | dir->bhs[blk] = sb_bread(sb, block); |
72 | if (!dir->bhs[blk]) { | |
19bdd41a JP |
73 | adfs_error(sb, "dir object %x failed read for offset %d, mapped block %lX", |
74 | id, blk, block); | |
1da177e4 | 75 | goto out; |
2f09719a SS |
76 | } |
77 | ||
78 | dir->nr_buffers += 1; | |
1da177e4 LT |
79 | } |
80 | ||
2f09719a | 81 | t = (struct adfs_bigdirtail *) |
71b26127 | 82 | (dir->bhs[size - 1]->b_data + (sb->s_blocksize - 8)); |
1da177e4 LT |
83 | |
84 | if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) || | |
85 | t->bigdirendmasseq != h->startmasseq || | |
2f09719a | 86 | t->reserved[0] != 0 || t->reserved[1] != 0) { |
ceb3b106 | 87 | adfs_error(sb, "dir %06x has malformed tail", id); |
1da177e4 | 88 | goto out; |
2f09719a | 89 | } |
1da177e4 LT |
90 | |
91 | dir->parent_id = le32_to_cpu(h->bigdirparent); | |
1da177e4 | 92 | return 0; |
2f09719a | 93 | |
1da177e4 | 94 | out: |
1dd9f5ba | 95 | adfs_dir_relse(dir); |
2f09719a | 96 | |
1da177e4 LT |
97 | return ret; |
98 | } | |
99 | ||
100 | static int | |
101 | adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos) | |
102 | { | |
2f09719a | 103 | struct adfs_bigdirheader *h = |
71b26127 | 104 | (struct adfs_bigdirheader *) dir->bhs[0]->b_data; |
1da177e4 LT |
105 | int ret = -ENOENT; |
106 | ||
107 | if (fpos <= le32_to_cpu(h->bigdirentries)) { | |
108 | dir->pos = fpos; | |
109 | ret = 0; | |
110 | } | |
111 | ||
112 | return ret; | |
113 | } | |
114 | ||
115 | static void | |
116 | dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len) | |
117 | { | |
118 | struct super_block *sb = dir->sb; | |
119 | unsigned int buffer, partial, remainder; | |
120 | ||
121 | buffer = offset >> sb->s_blocksize_bits; | |
122 | offset &= sb->s_blocksize - 1; | |
123 | ||
124 | partial = sb->s_blocksize - offset; | |
125 | ||
126 | if (partial >= len) | |
71b26127 | 127 | memcpy(to, dir->bhs[buffer]->b_data + offset, len); |
1da177e4 LT |
128 | else { |
129 | char *c = (char *)to; | |
130 | ||
131 | remainder = len - partial; | |
132 | ||
2f09719a | 133 | memcpy(c, |
71b26127 | 134 | dir->bhs[buffer]->b_data + offset, |
2f09719a SS |
135 | partial); |
136 | ||
137 | memcpy(c + partial, | |
71b26127 | 138 | dir->bhs[buffer + 1]->b_data, |
2f09719a | 139 | remainder); |
1da177e4 LT |
140 | } |
141 | } | |
142 | ||
143 | static int | |
144 | adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) | |
145 | { | |
2f09719a | 146 | struct adfs_bigdirheader *h = |
71b26127 | 147 | (struct adfs_bigdirheader *) dir->bhs[0]->b_data; |
1da177e4 LT |
148 | struct adfs_bigdirentry bde; |
149 | unsigned int offset; | |
adb514a4 | 150 | int ret = -ENOENT; |
1da177e4 LT |
151 | |
152 | if (dir->pos >= le32_to_cpu(h->bigdirentries)) | |
153 | goto out; | |
154 | ||
155 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
156 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
157 | offset += dir->pos * sizeof(struct adfs_bigdirentry); | |
158 | ||
159 | dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry)); | |
160 | ||
161 | obj->loadaddr = le32_to_cpu(bde.bigdirload); | |
162 | obj->execaddr = le32_to_cpu(bde.bigdirexec); | |
163 | obj->size = le32_to_cpu(bde.bigdirlen); | |
5ed70bb4 | 164 | obj->indaddr = le32_to_cpu(bde.bigdirindaddr); |
1da177e4 LT |
165 | obj->attr = le32_to_cpu(bde.bigdirattr); |
166 | obj->name_len = le32_to_cpu(bde.bigdirobnamelen); | |
167 | ||
168 | offset = offsetof(struct adfs_bigdirheader, bigdirname); | |
169 | offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3); | |
170 | offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry); | |
171 | offset += le32_to_cpu(bde.bigdirobnameptr); | |
172 | ||
173 | dir_memcpy(dir, offset, obj->name, obj->name_len); | |
411c49bc | 174 | adfs_object_fixup(dir, obj); |
da23ef05 | 175 | |
1da177e4 LT |
176 | dir->pos += 1; |
177 | ret = 0; | |
178 | out: | |
179 | return ret; | |
180 | } | |
181 | ||
0125f504 | 182 | const struct adfs_dir_ops adfs_fplus_dir_ops = { |
1da177e4 LT |
183 | .read = adfs_fplus_read, |
184 | .setpos = adfs_fplus_setpos, | |
185 | .getnext = adfs_fplus_getnext, | |
1da177e4 | 186 | }; |