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1 | /* |
2 | * symlink.c |
3 | * |
4 | * PURPOSE |
5 | * Symlink handling routines for the OSTA-UDF(tm) filesystem. |
6 | * |
7 | * COPYRIGHT |
8 | * This file is distributed under the terms of the GNU General Public |
9 | * License (GPL). Copies of the GPL can be obtained from: |
10 | * ftp://prep.ai.mit.edu/pub/gnu/GPL |
11 | * Each contributing author retains all rights to their own work. |
12 | * |
13 | * (C) 1998-2001 Ben Fennema |
14 | * (C) 1999 Stelias Computing Inc |
15 | * |
16 | * HISTORY |
17 | * |
18 | * 04/16/99 blf Created. |
19 | * |
20 | */ |
21 | |
22 | #include "udfdecl.h" |
23 | #include <asm/uaccess.h> |
24 | #include <linux/errno.h> |
25 | #include <linux/fs.h> |
26 | #include <linux/time.h> |
27 | #include <linux/mm.h> |
28 | #include <linux/stat.h> |
29 | #include <linux/pagemap.h> |
30 | #include <linux/smp_lock.h> |
31 | #include <linux/buffer_head.h> |
32 | #include "udf_i.h" |
33 | |
34 | static void udf_pc_to_char(struct super_block *sb, unsigned char *from, |
35 | int fromlen, unsigned char *to) |
36 | { |
37 | struct pathComponent *pc; |
38 | int elen = 0; |
39 | unsigned char *p = to; |
40 | |
41 | while (elen < fromlen) { |
42 | pc = (struct pathComponent *)(from + elen); |
43 | switch (pc->componentType) { |
44 | case 1: |
45 | if (pc->lengthComponentIdent == 0) { |
46 | p = to; |
47 | *p++ = '/'; |
48 | } |
49 | break; |
50 | case 3: |
51 | memcpy(p, "../", 3); |
52 | p += 3; |
53 | break; |
54 | case 4: |
55 | memcpy(p, "./", 2); |
56 | p += 2; |
57 | /* that would be . - just ignore */ |
58 | break; |
59 | case 5: |
60 | p += udf_get_filename(sb, pc->componentIdent, p, |
61 | pc->lengthComponentIdent); |
62 | *p++ = '/'; |
63 | break; |
64 | } |
65 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; |
66 | } |
67 | if (p > to + 1) |
68 | p[-1] = '\0'; |
69 | else |
70 | p[0] = '\0'; |
71 | } |
72 | |
73 | static int udf_symlink_filler(struct file *file, struct page *page) |
74 | { |
75 | struct inode *inode = page->mapping->host; |
76 | struct buffer_head *bh = NULL; |
77 | unsigned char *symlink; |
78 | int err = -EIO; |
79 | unsigned char *p = kmap(page); |
80 | struct udf_inode_info *iinfo; |
81 | |
82 | lock_kernel(); |
83 | iinfo = UDF_I(inode); |
84 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
85 | symlink = iinfo->i_ext.i_data + iinfo->i_lenEAttr; |
86 | } else { |
87 | bh = sb_bread(inode->i_sb, udf_block_map(inode, 0)); |
88 | |
89 | if (!bh) |
90 | goto out; |
91 | |
92 | symlink = bh->b_data; |
93 | } |
94 | |
95 | udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p); |
96 | brelse(bh); |
97 | |
98 | unlock_kernel(); |
99 | SetPageUptodate(page); |
100 | kunmap(page); |
101 | unlock_page(page); |
102 | return 0; |
103 | |
104 | out: |
105 | unlock_kernel(); |
106 | SetPageError(page); |
107 | kunmap(page); |
108 | unlock_page(page); |
109 | return err; |
110 | } |
111 | |
112 | /* |
113 | * symlinks can't do much... |
114 | */ |
115 | const struct address_space_operations udf_symlink_aops = { |
116 | .readpage = udf_symlink_filler, |
117 | }; |
118 |
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