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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [fs/] [xiafs/] [symlink.c] - Blame information for rev 1782

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/*
 *  linux/fs/xiafs/symlink.c
 *
 *  Copyright (C) Q. Frank Xia, 1993.
 *
 *  Based on Linus' minix/symlink.c
 *  Copyright (C) Linus Torvalds, 1991, 1992.
 *
 *  This software may be redistributed per Linux Copyright.
 */
 
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/xia_fs.h>
#include <linux/stat.h>
 
#include <asm/segment.h>
 
static int
xiafs_readlink(struct inode *, char *, int);
 
static int
xiafs_follow_link(struct inode *, struct inode *, int, int, struct inode **);
 
/*
 * symlinks can't do much...
 */
struct inode_operations xiafs_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 */
        xiafs_readlink,         /* readlink */
        xiafs_follow_link,      /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL                    /* permission */
};
 
static int xiafs_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 > BLOCK_SIZE)
        buflen = BLOCK_SIZE;
    bh = xiafs_bread(inode, 0, 0);
    if (!IS_RDONLY (inode)) {
        inode->i_atime=CURRENT_TIME;
        inode->i_dirt=1;
    }
    iput(inode);
    if (!bh)
        return 0;
    for (i=0; i < buflen && (c=bh->b_data[i]); i++)
      put_user(c, buffer++);
    if (i < buflen-1)
      put_user('\0', buffer);
    brelse(bh);
    return i;
}
 
static int xiafs_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 (!IS_RDONLY (inode)) {
        inode->i_atime=CURRENT_TIME;
        inode->i_dirt=1;
    }
    if (current->link_count > 5) {
        iput(inode);
        iput(dir);
        return -ELOOP;
    }
    if (!(bh = xiafs_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;
}
 
 
 

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/fs/xiafs/symlink.c`
3			`*`
4			`* Copyright (C) Q. Frank Xia, 1993.`
5			`*`
6			`* Based on Linus' minix/symlink.c`
7			`* Copyright (C) Linus Torvalds, 1991, 1992.`
8			`*`
9			`* This software may be redistributed per Linux Copyright.`
10			`*/`
11
12			`#include <linux/errno.h>`
13			`#include <linux/sched.h>`
14			`#include <linux/fs.h>`
15			`#include <linux/xia_fs.h>`
16			`#include <linux/stat.h>`
17
18			`#include <asm/segment.h>`
19
20			`static int`
21			`xiafs_readlink(struct inode , char , int);`
22
23			`static int`
24			`xiafs_follow_link(struct inode , struct inode , int, int, struct inode **);`
25
26			`/*`
27			`* symlinks can't do much...`
28			`*/`
29			`struct inode_operations xiafs_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			`xiafs_readlink, /* readlink */`
41			`xiafs_follow_link, /* follow_link */`
42			`NULL, /* readpage */`
43			`NULL, /* writepage */`
44			`NULL, /* bmap */`
45			`NULL, /* truncate */`
46			`NULL /* permission */`
47			`};`
48
49			`static int xiafs_readlink(struct inode * inode, char * buffer, int buflen)`
50			`{`
51			`struct buffer_head * bh;`
52			`int i;`
53			`char c;`
54
55			`if (!S_ISLNK(inode->i_mode)) {`
56			`iput(inode);`
57			`return -EINVAL;`
58			`}`
59			`if (buflen > BLOCK_SIZE)`
60			`buflen = BLOCK_SIZE;`
61			`bh = xiafs_bread(inode, 0, 0);`
62			`if (!IS_RDONLY (inode)) {`
63			`inode->i_atime=CURRENT_TIME;`
64			`inode->i_dirt=1;`
65			`}`
66			`iput(inode);`
67			`if (!bh)`
68			`return 0;`
69			`for (i=0; i < buflen && (c=bh->b_data[i]); i++)`
70			`put_user(c, buffer++);`
71			`if (i < buflen-1)`
72			`put_user('\0', buffer);`
73			`brelse(bh);`
74			`return i;`
75			`}`
76
77			`static int xiafs_follow_link(struct inode * dir, struct inode * inode,`
78			`int flag, int mode, struct inode ** res_inode)`
79			`{`
80			`int error;`
81			`struct buffer_head * bh;`
82
83			`*res_inode = NULL;`
84			`if (!dir) {`
85			`dir = current->fs->root;`
86			`dir->i_count++;`
87			`}`
88			`if (!inode) {`
89			`iput(dir);`
90			`return -ENOENT;`
91			`}`
92			`if (!S_ISLNK(inode->i_mode)) {`
93			`iput(dir);`
94			`*res_inode = inode;`
95			`return 0;`
96			`}`
97			`if (!IS_RDONLY (inode)) {`
98			`inode->i_atime=CURRENT_TIME;`
99			`inode->i_dirt=1;`
100			`}`
101			`if (current->link_count > 5) {`
102			`iput(inode);`
103			`iput(dir);`
104			`return -ELOOP;`
105			`}`
106			`if (!(bh = xiafs_bread(inode, 0, 0))) {`
107			`iput(inode);`
108			`iput(dir);`
109			`return -EIO;`
110			`}`
111			`iput(inode);`
112			`current->link_count++;`
113			`error = open_namei(bh->b_data,flag,mode,res_inode,dir);`
114			`current->link_count--;`
115			`brelse(bh);`
116			`return error;`
117			`}`
118
119
120

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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [fs/] [xiafs/] [symlink.c] - Blame information for rev 1782