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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [ext/] [symlink.c] - Blame information for rev 1777

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/*
 *  linux/fs/ext/symlink.c
 *
 *  Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
 *
 *  from
 *
 *  linux/fs/minix/symlink.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext symlink handling code
 */
 
#include <asm/segment.h>
 
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/ext_fs.h>
#include <linux/stat.h>
 
static int ext_readlink(struct inode *, char *, int);
static int ext_follow_link(struct inode *, struct inode *, int, int, struct inode **);
 
/*
 * symlinks can't do much...
 */
struct inode_operations ext_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 */
        ext_readlink,           /* readlink */
        ext_follow_link,        /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL                    /* permission */
};
 
static int ext_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(dir);
                iput(inode);
                return -ELOOP;
        }
        if (!(bh = ext_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 ext_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 = ext_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	1628	jcastillo	`/*`
2			`* linux/fs/ext/symlink.c`
3			`*`
4			`* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)`
5			`*`
6			`* from`
7			`*`
8			`* linux/fs/minix/symlink.c`
9			`*`
10			`* Copyright (C) 1991, 1992 Linus Torvalds`
11			`*`
12			`* ext symlink handling code`
13			`*/`
14
15			`#include <asm/segment.h>`
16
17			`#include <linux/errno.h>`
18			`#include <linux/sched.h>`
19			`#include <linux/fs.h>`
20			`#include <linux/ext_fs.h>`
21			`#include <linux/stat.h>`
22
23			`static int ext_readlink(struct inode , char , int);`
24			`static int ext_follow_link(struct inode , struct inode , int, int, struct inode **);`
25
26			`/*`
27			`* symlinks can't do much...`
28			`*/`
29			`struct inode_operations ext_symlink_inode_operations = {`
30			`NULL, /* no file-operations */`
31			`NULL, /* create */`
32			`NULL, /* lookup */`
33			`NULL, /* link */`
34			`NULL, /* unlink */`
35			`NULL, /* symlink */`
36			`NULL, /* mkdir */`
37			`NULL, /* rmdir */`
38			`NULL, /* mknod */`
39			`NULL, /* rename */`
40			`ext_readlink, /* readlink */`
41			`ext_follow_link, /* follow_link */`
42			`NULL, /* readpage */`
43			`NULL, /* writepage */`
44			`NULL, /* bmap */`
45			`NULL, /* truncate */`
46			`NULL /* permission */`
47			`};`
48
49			`static int ext_follow_link(struct inode * dir, struct inode * inode,`
50			`int flag, int mode, struct inode ** res_inode)`
51			`{`
52			`int error;`
53			`struct buffer_head * bh;`
54
55			`*res_inode = NULL;`
56			`if (!dir) {`
57			`dir = current->fs->root;`
58			`dir->i_count++;`
59			`}`
60			`if (!inode) {`
61			`iput(dir);`
62			`return -ENOENT;`
63			`}`
64			`if (!S_ISLNK(inode->i_mode)) {`
65			`iput(dir);`
66			`*res_inode = inode;`
67			`return 0;`
68			`}`
69			`if (current->link_count > 5) {`
70			`iput(dir);`
71			`iput(inode);`
72			`return -ELOOP;`
73			`}`
74			`if (!(bh = ext_bread(inode, 0, 0))) {`
75			`iput(inode);`
76			`iput(dir);`
77			`return -EIO;`
78			`}`
79			`iput(inode);`
80			`current->link_count++;`
81			`error = open_namei(bh->b_data,flag,mode,res_inode,dir);`
82			`current->link_count--;`
83			`brelse(bh);`
84			`return error;`
85			`}`
86
87			`static int ext_readlink(struct inode * inode, char * buffer, int buflen)`
88			`{`
89			`struct buffer_head * bh;`
90			`int i;`
91			`char c;`
92
93			`if (!S_ISLNK(inode->i_mode)) {`
94			`iput(inode);`
95			`return -EINVAL;`
96			`}`
97			`if (buflen > 1023)`
98			`buflen = 1023;`
99			`bh = ext_bread(inode, 0, 0);`
100			`iput(inode);`
101			`if (!bh)`
102			`return 0;`
103			`i = 0;`
104			`while (i<buflen && (c = bh->b_data[i])) {`
105			`i++;`
106			`put_user(c,buffer++);`
107			`}`
108			`brelse(bh);`
109			`return i;`
110			`}`

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [ext/] [symlink.c] - Blame information for rev 1777