This source file includes following definitions.
- isofs_follow_link
- isofs_readlink
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12 #include <asm/segment.h>
13
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/fs.h>
17 #include <linux/iso_fs.h>
18 #include <linux/stat.h>
19
20 static int isofs_readlink(struct inode *, char *, int);
21 static int isofs_follow_link(struct inode *, struct inode *, int, int, struct inode **);
22
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25
26 struct inode_operations isofs_symlink_inode_operations = {
27 NULL,
28 NULL,
29 NULL,
30 NULL,
31 NULL,
32 NULL,
33 NULL,
34 NULL,
35 NULL,
36 NULL,
37 isofs_readlink,
38 isofs_follow_link,
39 NULL,
40 NULL
41 };
42
43 static int isofs_follow_link(struct inode * dir, struct inode * inode,
44 int flag, int mode, struct inode ** res_inode)
45 {
46 int error;
47 unsigned short fs;
48 char * pnt;
49
50 if (!dir) {
51 dir = current->root;
52 dir->i_count++;
53 }
54 if (!inode) {
55 iput(dir);
56 *res_inode = NULL;
57 return -ENOENT;
58 }
59 if (!S_ISLNK(inode->i_mode)) {
60 iput(dir);
61 *res_inode = inode;
62 return 0;
63 }
64 __asm__("mov %%fs,%0":"=r" (fs));
65 if ((current->link_count > 5) ||
66 !(pnt = get_rock_ridge_symlink(inode))) {
67 iput(dir);
68 iput(inode);
69 *res_inode = NULL;
70 return -ELOOP;
71 }
72 iput(inode);
73 __asm__("mov %0,%%fs"::"r" ((unsigned short) 0x10));
74 current->link_count++;
75 error = open_namei(pnt,flag,mode,res_inode,dir);
76 current->link_count--;
77 __asm__("mov %0,%%fs"::"r" (fs));
78 kfree(pnt);
79 return error;
80 }
81
82 static int isofs_readlink(struct inode * inode, char * buffer, int buflen)
83 {
84 char * pnt;
85 int i;
86 char c;
87
88 if (!S_ISLNK(inode->i_mode)) {
89 iput(inode);
90 return -EINVAL;
91 }
92
93 if (buflen > 1023)
94 buflen = 1023;
95 pnt = get_rock_ridge_symlink(inode);
96
97 iput(inode);
98 if (!pnt)
99 return 0;
100 i = 0;
101
102 while (i<buflen && (c = pnt[i])) {
103 i++;
104 put_fs_byte(c,buffer++);
105 }
106 kfree(pnt);
107 return i;
108 }