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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 | */ |
1da177e4 LT |
7 | #include "adfs.h" |
8 | #include "dir_fplus.h" | |
9 | ||
0db35a02 RK |
10 | /* Return the byte offset to directory entry pos */ |
11 | static unsigned int adfs_fplus_offset(const struct adfs_bigdirheader *h, | |
12 | unsigned int pos) | |
13 | { | |
14 | return offsetof(struct adfs_bigdirheader, bigdirname) + | |
15 | ALIGN(le32_to_cpu(h->bigdirnamelen), 4) + | |
16 | pos * sizeof(struct adfs_bigdirentry); | |
17 | } | |
18 | ||
419a6e5e RK |
19 | static int adfs_fplus_read(struct super_block *sb, u32 indaddr, |
20 | unsigned int size, struct adfs_dir *dir) | |
1da177e4 LT |
21 | { |
22 | struct adfs_bigdirheader *h; | |
23 | struct adfs_bigdirtail *t; | |
419a6e5e RK |
24 | unsigned int dirsize; |
25 | int ret; | |
1da177e4 | 26 | |
419a6e5e RK |
27 | /* Read first buffer */ |
28 | ret = adfs_dir_read_buffers(sb, indaddr, sb->s_blocksize, dir); | |
29 | if (ret) | |
30 | return ret; | |
1da177e4 | 31 | |
016936b3 | 32 | dir->bighead = h = (void *)dir->bhs[0]->b_data; |
419a6e5e RK |
33 | dirsize = le32_to_cpu(h->bigdirsize); |
34 | if (dirsize != size) { | |
ceb3b106 | 35 | adfs_msg(sb, KERN_WARNING, |
419a6e5e RK |
36 | "dir %06x header size %X does not match directory size %X", |
37 | indaddr, dirsize, size); | |
1da177e4 LT |
38 | } |
39 | ||
40 | if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 || | |
41 | h->bigdirversion[2] != 0 || size & 2047 || | |
2f09719a | 42 | h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) { |
419a6e5e | 43 | adfs_error(sb, "dir %06x has malformed header", indaddr); |
1da177e4 | 44 | goto out; |
2f09719a | 45 | } |
1da177e4 | 46 | |
419a6e5e RK |
47 | /* Read remaining buffers */ |
48 | ret = adfs_dir_read_buffers(sb, indaddr, dirsize, dir); | |
49 | if (ret) | |
50 | return ret; | |
1da177e4 | 51 | |
016936b3 | 52 | dir->bigtail = t = (struct adfs_bigdirtail *) |
419a6e5e | 53 | (dir->bhs[dir->nr_buffers - 1]->b_data + (sb->s_blocksize - 8)); |
1da177e4 LT |
54 | |
55 | if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) || | |
56 | t->bigdirendmasseq != h->startmasseq || | |
2f09719a | 57 | t->reserved[0] != 0 || t->reserved[1] != 0) { |
419a6e5e | 58 | adfs_error(sb, "dir %06x has malformed tail", indaddr); |
1da177e4 | 59 | goto out; |
2f09719a | 60 | } |
1da177e4 LT |
61 | |
62 | dir->parent_id = le32_to_cpu(h->bigdirparent); | |
1da177e4 | 63 | return 0; |
2f09719a | 64 | |
1da177e4 | 65 | out: |
1dd9f5ba | 66 | adfs_dir_relse(dir); |
2f09719a | 67 | |
1da177e4 LT |
68 | return ret; |
69 | } | |
70 | ||
71 | static int | |
72 | adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos) | |
73 | { | |
1da177e4 LT |
74 | int ret = -ENOENT; |
75 | ||
016936b3 | 76 | if (fpos <= le32_to_cpu(dir->bighead->bigdirentries)) { |
1da177e4 LT |
77 | dir->pos = fpos; |
78 | ret = 0; | |
79 | } | |
80 | ||
81 | return ret; | |
82 | } | |
83 | ||
1da177e4 LT |
84 | static int |
85 | adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) | |
86 | { | |
016936b3 | 87 | struct adfs_bigdirheader *h = dir->bighead; |
1da177e4 LT |
88 | struct adfs_bigdirentry bde; |
89 | unsigned int offset; | |
a317120b | 90 | int ret; |
1da177e4 LT |
91 | |
92 | if (dir->pos >= le32_to_cpu(h->bigdirentries)) | |
a317120b | 93 | return -ENOENT; |
1da177e4 | 94 | |
0db35a02 | 95 | offset = adfs_fplus_offset(h, dir->pos); |
1da177e4 | 96 | |
a317120b RK |
97 | ret = adfs_dir_copyfrom(&bde, dir, offset, |
98 | sizeof(struct adfs_bigdirentry)); | |
99 | if (ret) | |
100 | return ret; | |
1da177e4 LT |
101 | |
102 | obj->loadaddr = le32_to_cpu(bde.bigdirload); | |
103 | obj->execaddr = le32_to_cpu(bde.bigdirexec); | |
104 | obj->size = le32_to_cpu(bde.bigdirlen); | |
5ed70bb4 | 105 | obj->indaddr = le32_to_cpu(bde.bigdirindaddr); |
1da177e4 LT |
106 | obj->attr = le32_to_cpu(bde.bigdirattr); |
107 | obj->name_len = le32_to_cpu(bde.bigdirobnamelen); | |
108 | ||
0db35a02 | 109 | offset = adfs_fplus_offset(h, le32_to_cpu(h->bigdirentries)); |
1da177e4 LT |
110 | offset += le32_to_cpu(bde.bigdirobnameptr); |
111 | ||
a317120b RK |
112 | ret = adfs_dir_copyfrom(obj->name, dir, offset, obj->name_len); |
113 | if (ret) | |
114 | return ret; | |
115 | ||
411c49bc | 116 | adfs_object_fixup(dir, obj); |
da23ef05 | 117 | |
1da177e4 | 118 | dir->pos += 1; |
a317120b RK |
119 | |
120 | return 0; | |
1da177e4 LT |
121 | } |
122 | ||
4287e4de RK |
123 | static int adfs_fplus_iterate(struct adfs_dir *dir, struct dir_context *ctx) |
124 | { | |
125 | struct object_info obj; | |
126 | ||
127 | if ((ctx->pos - 2) >> 32) | |
128 | return 0; | |
129 | ||
130 | if (adfs_fplus_setpos(dir, ctx->pos - 2)) | |
131 | return 0; | |
132 | ||
133 | while (!adfs_fplus_getnext(dir, &obj)) { | |
134 | if (!dir_emit(ctx, obj.name, obj.name_len, | |
135 | obj.indaddr, DT_UNKNOWN)) | |
136 | break; | |
137 | ctx->pos++; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
0125f504 | 143 | const struct adfs_dir_ops adfs_fplus_dir_ops = { |
1da177e4 | 144 | .read = adfs_fplus_read, |
4287e4de | 145 | .iterate = adfs_fplus_iterate, |
1da177e4 LT |
146 | .setpos = adfs_fplus_setpos, |
147 | .getnext = adfs_fplus_getnext, | |
1da177e4 | 148 | }; |