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1da177e4 LT |
1 | /* |
2 | * symlink.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Symlink handling routines for the OSTA-UDF(tm) filesystem. | |
6 | * | |
7 | * CONTACTS | |
8 | * E-mail regarding any portion of the Linux UDF file system should be | |
9 | * directed to the development team mailing list (run by majordomo): | |
10 | * linux_udf@hpesjro.fc.hp.com | |
11 | * | |
12 | * COPYRIGHT | |
13 | * This file is distributed under the terms of the GNU General Public | |
14 | * License (GPL). Copies of the GPL can be obtained from: | |
15 | * ftp://prep.ai.mit.edu/pub/gnu/GPL | |
16 | * Each contributing author retains all rights to their own work. | |
17 | * | |
18 | * (C) 1998-2001 Ben Fennema | |
19 | * (C) 1999 Stelias Computing Inc | |
20 | * | |
21 | * HISTORY | |
22 | * | |
23 | * 04/16/99 blf Created. | |
24 | * | |
25 | */ | |
26 | ||
27 | #include "udfdecl.h" | |
28 | #include <asm/uaccess.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/udf_fs.h> | |
32 | #include <linux/time.h> | |
33 | #include <linux/mm.h> | |
34 | #include <linux/stat.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/pagemap.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/buffer_head.h> | |
39 | #include "udf_i.h" | |
40 | ||
41 | static void udf_pc_to_char(struct super_block *sb, char *from, int fromlen, char *to) | |
42 | { | |
43 | struct pathComponent *pc; | |
44 | int elen = 0; | |
45 | char *p = to; | |
46 | ||
47 | while (elen < fromlen) | |
48 | { | |
49 | pc = (struct pathComponent *)(from + elen); | |
50 | switch (pc->componentType) | |
51 | { | |
52 | case 1: | |
53 | if (pc->lengthComponentIdent == 0) | |
54 | { | |
55 | p = to; | |
56 | *p++ = '/'; | |
57 | } | |
58 | break; | |
59 | case 3: | |
60 | memcpy(p, "../", 3); | |
61 | p += 3; | |
62 | break; | |
63 | case 4: | |
64 | memcpy(p, "./", 2); | |
65 | p += 2; | |
66 | /* that would be . - just ignore */ | |
67 | break; | |
68 | case 5: | |
69 | p += udf_get_filename(sb, pc->componentIdent, p, pc->lengthComponentIdent); | |
70 | *p++ = '/'; | |
71 | break; | |
72 | } | |
73 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; | |
74 | } | |
75 | if (p > to+1) | |
76 | p[-1] = '\0'; | |
77 | else | |
78 | p[0] = '\0'; | |
79 | } | |
80 | ||
81 | static int udf_symlink_filler(struct file *file, struct page *page) | |
82 | { | |
83 | struct inode *inode = page->mapping->host; | |
84 | struct buffer_head *bh = NULL; | |
85 | char *symlink; | |
86 | int err = -EIO; | |
87 | char *p = kmap(page); | |
88 | ||
89 | lock_kernel(); | |
90 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) | |
91 | symlink = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode); | |
92 | else | |
93 | { | |
94 | bh = sb_bread(inode->i_sb, udf_block_map(inode, 0)); | |
95 | ||
96 | if (!bh) | |
97 | goto out; | |
98 | ||
99 | symlink = bh->b_data; | |
100 | } | |
101 | ||
102 | udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p); | |
103 | udf_release_data(bh); | |
104 | ||
105 | unlock_kernel(); | |
106 | SetPageUptodate(page); | |
107 | kunmap(page); | |
108 | unlock_page(page); | |
109 | return 0; | |
110 | out: | |
111 | unlock_kernel(); | |
112 | SetPageError(page); | |
113 | kunmap(page); | |
114 | unlock_page(page); | |
115 | return err; | |
116 | } | |
117 | ||
118 | /* | |
119 | * symlinks can't do much... | |
120 | */ | |
121 | struct address_space_operations udf_symlink_aops = { | |
122 | .readpage = udf_symlink_filler, | |
123 | }; |