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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [fs/] [isofs/] [symlink.c] - Blame information for rev 1765

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/*
 *  linux/fs/isofs/symlink.c
 *
 *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  isofs symlink handling code.  This is only used with the Rock Ridge
 *  extensions to iso9660
 */
 
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/iso_fs.h>
#include <linux/stat.h>
#include <linux/malloc.h>
 
#include <asm/segment.h>
 
static int isofs_readlink(struct inode *, char *, int);
static int isofs_follow_link(struct inode *, struct inode *, int, int, struct inode **);
 
/*
 * symlinks can't do much...
 */
struct inode_operations isofs_symlink_inode_operations = {
        NULL,                   /* no file-operations */
        NULL,                   /* create */
        NULL,                   /* lookup */
        NULL,                   /* link */
        NULL,                   /* unlink */
        NULL,                   /* symlink */
        NULL,                   /* mkdir */
        NULL,                   /* rmdir */
        NULL,                   /* mknod */
        NULL,                   /* rename */
        isofs_readlink,         /* readlink */
        isofs_follow_link,      /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL                    /* permission */
};
 
static int isofs_follow_link(struct inode * dir, struct inode * inode,
        int flag, int mode, struct inode ** res_inode)
{
        int error;
        char * pnt;
 
        if (!dir) {
                dir = current->fs->root;
                dir->i_count++;
        }
        if (!inode) {
                iput(dir);
                *res_inode = NULL;
                return -ENOENT;
        }
        if (!S_ISLNK(inode->i_mode)) {
                iput(dir);
                *res_inode = inode;
                return 0;
        }
        if ((current->link_count > 5) ||
           !(pnt = get_rock_ridge_symlink(inode))) {
                iput(dir);
                iput(inode);
                *res_inode = NULL;
                return -ELOOP;
        }
        iput(inode);
        current->link_count++;
        error = open_namei(pnt,flag,mode,res_inode,dir);
        current->link_count--;
        kfree(pnt);
        return error;
}
 
static int isofs_readlink(struct inode * inode, char * buffer, int buflen)
{
        char * pnt;
        int i;
        char c;
 
        if (!S_ISLNK(inode->i_mode)) {
                iput(inode);
                return -EINVAL;
        }
 
        if (buflen > 1023)
                buflen = 1023;
        pnt = get_rock_ridge_symlink(inode);
 
        iput(inode);
        if (!pnt)
                return 0;
        i = 0;
 
        while (i<buflen && (c = pnt[i])) {
                i++;
                put_user(c,buffer++);
        }
        kfree(pnt);
        return i;
}

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/fs/isofs/symlink.c`
3			`*`
4			`* (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.`
5			`*`
6			`* Copyright (C) 1991, 1992 Linus Torvalds`
7			`*`
8			`* isofs symlink handling code. This is only used with the Rock Ridge`
9			`* extensions to iso9660`
10			`*/`
11
12			`#include <linux/errno.h>`
13			`#include <linux/sched.h>`
14			`#include <linux/fs.h>`
15			`#include <linux/iso_fs.h>`
16			`#include <linux/stat.h>`
17			`#include <linux/malloc.h>`
18
19			`#include <asm/segment.h>`
20
21			`static int isofs_readlink(struct inode , char , int);`
22			`static int isofs_follow_link(struct inode , struct inode , int, int, struct inode **);`
23
24			`/*`
25			`* symlinks can't do much...`
26			`*/`
27			`struct inode_operations isofs_symlink_inode_operations = {`
28			`NULL, /* no file-operations */`
29			`NULL, /* create */`
30			`NULL, /* lookup */`
31			`NULL, /* link */`
32			`NULL, /* unlink */`
33			`NULL, /* symlink */`
34			`NULL, /* mkdir */`
35			`NULL, /* rmdir */`
36			`NULL, /* mknod */`
37			`NULL, /* rename */`
38			`isofs_readlink, /* readlink */`
39			`isofs_follow_link, /* follow_link */`
40			`NULL, /* readpage */`
41			`NULL, /* writepage */`
42			`NULL, /* bmap */`
43			`NULL, /* truncate */`
44			`NULL /* permission */`
45			`};`
46
47			`static int isofs_follow_link(struct inode * dir, struct inode * inode,`
48			`int flag, int mode, struct inode ** res_inode)`
49			`{`
50			`int error;`
51			`char * pnt;`
52
53			`if (!dir) {`
54			`dir = current->fs->root;`
55			`dir->i_count++;`
56			`}`
57			`if (!inode) {`
58			`iput(dir);`
59			`*res_inode = NULL;`
60			`return -ENOENT;`
61			`}`
62			`if (!S_ISLNK(inode->i_mode)) {`
63			`iput(dir);`
64			`*res_inode = inode;`
65			`return 0;`
66			`}`
67			`if ((current->link_count > 5) \|\|`
68			`!(pnt = get_rock_ridge_symlink(inode))) {`
69			`iput(dir);`
70			`iput(inode);`
71			`*res_inode = NULL;`
72			`return -ELOOP;`
73			`}`
74			`iput(inode);`
75			`current->link_count++;`
76			`error = open_namei(pnt,flag,mode,res_inode,dir);`
77			`current->link_count--;`
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_user(c,buffer++);`
105			`}`
106			`kfree(pnt);`
107			`return i;`
108			`}`

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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [fs/] [isofs/] [symlink.c] - Blame information for rev 1765