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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [fs/] [minix/] [symlink.c] - Blame information for rev 901

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/*
 *  linux/fs/minix/symlink.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  minix symlink handling code
 */
 
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <linux/stat.h>
 
#include <asm/segment.h>
 
static int minix_readlink(struct inode *, char *, int);
static int minix_follow_link(struct inode *, struct inode *, int, int, struct inode **);
 
/*
 * symlinks can't do much...
 */
struct inode_operations minix_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 */
        minix_readlink,         /* readlink */
        minix_follow_link,      /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL                    /* permission */
};
 
static int minix_follow_link(struct inode * dir, struct inode * inode,
        int flag, int mode, struct inode ** res_inode)
{
        int error;
        struct buffer_head * bh;
 
        *res_inode = NULL;
        if (!dir) {
                dir = current->fs->root;
                dir->i_count++;
        }
        if (!inode) {
                iput(dir);
                return -ENOENT;
        }
        if (!S_ISLNK(inode->i_mode)) {
                iput(dir);
                *res_inode = inode;
                return 0;
        }
        if (current->link_count > 5) {
                iput(inode);
                iput(dir);
                return -ELOOP;
        }
        if (!(bh = minix_bread(inode, 0, 0))) {
                iput(inode);
                iput(dir);
                return -EIO;
        }
        iput(inode);
        current->link_count++;
        error = open_namei(bh->b_data,flag,mode,res_inode,dir);
        current->link_count--;
        brelse(bh);
        return error;
}
 
static int minix_readlink(struct inode * inode, char * buffer, int buflen)
{
        struct buffer_head * bh;
        int i;
        char c;
 
        if (!S_ISLNK(inode->i_mode)) {
                iput(inode);
                return -EINVAL;
        }
        if (buflen > 1023)
                buflen = 1023;
        bh = minix_bread(inode, 0, 0);
        iput(inode);
        if (!bh)
                return 0;
        i = 0;
        while (i<buflen && (c = bh->b_data[i])) {
                i++;
                put_user(c,buffer++);
        }
        brelse(bh);
        return i;
}

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/fs/minix/symlink.c`
3			`*`
4			`* Copyright (C) 1991, 1992 Linus Torvalds`
5			`*`
6			`* minix symlink handling code`
7			`*/`
8
9			`#include <linux/errno.h>`
10			`#include <linux/sched.h>`
11			`#include <linux/fs.h>`
12			`#include <linux/minix_fs.h>`
13			`#include <linux/stat.h>`
14
15			`#include <asm/segment.h>`
16
17			`static int minix_readlink(struct inode , char , int);`
18			`static int minix_follow_link(struct inode , struct inode , int, int, struct inode **);`
19
20			`/*`
21			`* symlinks can't do much...`
22			`*/`
23			`struct inode_operations minix_symlink_inode_operations = {`
24			`NULL, /* no file-operations */`
25			`NULL, /* create */`
26			`NULL, /* lookup */`
27			`NULL, /* link */`
28			`NULL, /* unlink */`
29			`NULL, /* symlink */`
30			`NULL, /* mkdir */`
31			`NULL, /* rmdir */`
32			`NULL, /* mknod */`
33			`NULL, /* rename */`
34			`minix_readlink, /* readlink */`
35			`minix_follow_link, /* follow_link */`
36			`NULL, /* readpage */`
37			`NULL, /* writepage */`
38			`NULL, /* bmap */`
39			`NULL, /* truncate */`
40			`NULL /* permission */`
41			`};`
42
43			`static int minix_follow_link(struct inode * dir, struct inode * inode,`
44			`int flag, int mode, struct inode ** res_inode)`
45			`{`
46			`int error;`
47			`struct buffer_head * bh;`
48
49			`*res_inode = NULL;`
50			`if (!dir) {`
51			`dir = current->fs->root;`
52			`dir->i_count++;`
53			`}`
54			`if (!inode) {`
55			`iput(dir);`
56			`return -ENOENT;`
57			`}`
58			`if (!S_ISLNK(inode->i_mode)) {`
59			`iput(dir);`
60			`*res_inode = inode;`
61			`return 0;`
62			`}`
63			`if (current->link_count > 5) {`
64			`iput(inode);`
65			`iput(dir);`
66			`return -ELOOP;`
67			`}`
68			`if (!(bh = minix_bread(inode, 0, 0))) {`
69			`iput(inode);`
70			`iput(dir);`
71			`return -EIO;`
72			`}`
73			`iput(inode);`
74			`current->link_count++;`
75			`error = open_namei(bh->b_data,flag,mode,res_inode,dir);`
76			`current->link_count--;`
77			`brelse(bh);`
78			`return error;`
79			`}`
80
81			`static int minix_readlink(struct inode * inode, char * buffer, int buflen)`
82			`{`
83			`struct buffer_head * bh;`
84			`int i;`
85			`char c;`
86
87			`if (!S_ISLNK(inode->i_mode)) {`
88			`iput(inode);`
89			`return -EINVAL;`
90			`}`
91			`if (buflen > 1023)`
92			`buflen = 1023;`
93			`bh = minix_bread(inode, 0, 0);`
94			`iput(inode);`
95			`if (!bh)`
96			`return 0;`
97			`i = 0;`
98			`while (i<buflen && (c = bh->b_data[i])) {`
99			`i++;`
100			`put_user(c,buffer++);`
101			`}`
102			`brelse(bh);`
103			`return i;`
104			`}`

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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [fs/] [minix/] [symlink.c] - Blame information for rev 901