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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [ext2/] [symlink.c] - Blame information for rev 1782

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/*
 *  linux/fs/ext2/symlink.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/symlink.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext2 symlink handling code
 */
 
#include <asm/segment.h>
 
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/sched.h>
#include <linux/stat.h>
 
static int ext2_readlink (struct inode *, char *, int);
static int ext2_follow_link (struct inode *, struct inode *, int, int,
                               struct inode **);
 
/*
 * symlinks can't do much...
 */
struct inode_operations ext2_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 */
        ext2_readlink,          /* readlink */
        ext2_follow_link,       /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL,                   /* permission */
        NULL                    /* smap */
};
 
static int ext2_follow_link(struct inode * dir, struct inode * inode,
                            int flag, int mode, struct inode ** res_inode)
{
        int error;
        struct buffer_head * bh = NULL;
        char * link;
 
        *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 (inode->i_blocks) {
                if (!(bh = ext2_bread (inode, 0, 0, &error))) {
                        iput (dir);
                        iput (inode);
                        return -EIO;
                }
                link = bh->b_data;
        } else
                link = (char *) inode->u.ext2_i.i_data;
        UPDATE_ATIME(inode);
        current->link_count++;
        error = open_namei (link, flag, mode, res_inode, dir);
        current->link_count--;
        iput (inode);
        if (bh)
                brelse (bh);
        return error;
}
 
static int ext2_readlink (struct inode * inode, char * buffer, int buflen)
{
        struct buffer_head * bh = NULL;
        char * link;
        int i, err;
        char c;
 
        if (!S_ISLNK(inode->i_mode)) {
                iput (inode);
                return -EINVAL;
        }
        if (buflen > inode->i_sb->s_blocksize - 1)
                buflen = inode->i_sb->s_blocksize - 1;
        if (inode->i_blocks) {
                bh = ext2_bread (inode, 0, 0, &err);
                if (!bh) {
                        iput (inode);
                        return 0;
                }
                link = bh->b_data;
        }
        else
                link = (char *) inode->u.ext2_i.i_data;
        i = 0;
        while (i < buflen && (c = link[i])) {
                i++;
                put_user (c, buffer++);
        }
        UPDATE_ATIME(inode);
        iput (inode);
        if (bh)
                brelse (bh);
        return i;
}

Line No.	Rev	Author	Line
1	1628	jcastillo	`/*`
2			`* linux/fs/ext2/symlink.c`
3			`*`
4			`* Copyright (C) 1992, 1993, 1994, 1995`
5			`* Remy Card (card@masi.ibp.fr)`
6			`* Laboratoire MASI - Institut Blaise Pascal`
7			`* Universite Pierre et Marie Curie (Paris VI)`
8			`*`
9			`* from`
10			`*`
11			`* linux/fs/minix/symlink.c`
12			`*`
13			`* Copyright (C) 1991, 1992 Linus Torvalds`
14			`*`
15			`* ext2 symlink handling code`
16			`*/`
17
18			`#include <asm/segment.h>`
19
20			`#include <linux/errno.h>`
21			`#include <linux/fs.h>`
22			`#include <linux/ext2_fs.h>`
23			`#include <linux/sched.h>`
24			`#include <linux/stat.h>`
25
26			`static int ext2_readlink (struct inode , char , int);`
27			`static int ext2_follow_link (struct inode , struct inode , int, int,`
28			`struct inode **);`
29
30			`/*`
31			`* symlinks can't do much...`
32			`*/`
33			`struct inode_operations ext2_symlink_inode_operations = {`
34			`NULL, /* no file-operations */`
35			`NULL, /* create */`
36			`NULL, /* lookup */`
37			`NULL, /* link */`
38			`NULL, /* unlink */`
39			`NULL, /* symlink */`
40			`NULL, /* mkdir */`
41			`NULL, /* rmdir */`
42			`NULL, /* mknod */`
43			`NULL, /* rename */`
44			`ext2_readlink, /* readlink */`
45			`ext2_follow_link, /* follow_link */`
46			`NULL, /* readpage */`
47			`NULL, /* writepage */`
48			`NULL, /* bmap */`
49			`NULL, /* truncate */`
50			`NULL, /* permission */`
51			`NULL /* smap */`
52			`};`
53
54			`static int ext2_follow_link(struct inode * dir, struct inode * inode,`
55			`int flag, int mode, struct inode ** res_inode)`
56			`{`
57			`int error;`
58			`struct buffer_head * bh = NULL;`
59			`char * link;`
60
61			`*res_inode = NULL;`
62			`if (!dir) {`
63			`dir = current->fs->root;`
64			`dir->i_count++;`
65			`}`
66			`if (!inode) {`
67			`iput (dir);`
68			`return -ENOENT;`
69			`}`
70			`if (!S_ISLNK(inode->i_mode)) {`
71			`iput (dir);`
72			`*res_inode = inode;`
73			`return 0;`
74			`}`
75			`if (current->link_count > 5) {`
76			`iput (dir);`
77			`iput (inode);`
78			`return -ELOOP;`
79			`}`
80			`if (inode->i_blocks) {`
81			`if (!(bh = ext2_bread (inode, 0, 0, &error))) {`
82			`iput (dir);`
83			`iput (inode);`
84			`return -EIO;`
85			`}`
86			`link = bh->b_data;`
87			`} else`
88			`link = (char *) inode->u.ext2_i.i_data;`
89			`UPDATE_ATIME(inode);`
90			`current->link_count++;`
91			`error = open_namei (link, flag, mode, res_inode, dir);`
92			`current->link_count--;`
93			`iput (inode);`
94			`if (bh)`
95			`brelse (bh);`
96			`return error;`
97			`}`
98
99			`static int ext2_readlink (struct inode * inode, char * buffer, int buflen)`
100			`{`
101			`struct buffer_head * bh = NULL;`
102			`char * link;`
103			`int i, err;`
104			`char c;`
105
106			`if (!S_ISLNK(inode->i_mode)) {`
107			`iput (inode);`
108			`return -EINVAL;`
109			`}`
110			`if (buflen > inode->i_sb->s_blocksize - 1)`
111			`buflen = inode->i_sb->s_blocksize - 1;`
112			`if (inode->i_blocks) {`
113			`bh = ext2_bread (inode, 0, 0, &err);`
114			`if (!bh) {`
115			`iput (inode);`
116			`return 0;`
117			`}`
118			`link = bh->b_data;`
119			`}`
120			`else`
121			`link = (char *) inode->u.ext2_i.i_data;`
122			`i = 0;`
123			`while (i < buflen && (c = link[i])) {`
124			`i++;`
125			`put_user (c, buffer++);`
126			`}`
127			`UPDATE_ATIME(inode);`
128			`iput (inode);`
129			`if (bh)`
130			`brelse (bh);`
131			`return i;`
132			`}`

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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [ext2/] [symlink.c] - Blame information for rev 1782