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

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/*
 *  linux/fs/umsdos/file.c
 *
 *  Written 1992 by Jacques Gelinas
 *      inspired from linux/fs/msdos/file.c Werner Almesberger
 *
 *  Extended MS-DOS regular file handling primitives
 */
 
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/msdos_fs.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/umsdos_fs.h>
#include <linux/malloc.h>
 
#include <asm/segment.h>
#include <asm/system.h>
 
#define PRINTK(x)
#define Printk(x)       printk x
 
/*
        Read the data associate with the symlink.
        Return length read in buffer or  a negative error code.
*/
static int umsdos_readlink_x (
        struct inode *inode,
        char *buffer,
        int (*msdos_read)(struct inode *, struct file *, char *, int),
        int bufsiz)
{
        int ret = inode->i_size;
        struct file filp;
        filp.f_pos = 0;
        filp.f_reada = 0;
        if (ret > bufsiz) ret = bufsiz;
        if ((*msdos_read) (inode, &filp, buffer,ret) != ret){
                ret = -EIO;
        }
        return ret;
}
/*
        Follow a symbolic link chain by calling open_namei recursively
        until an inode is found.
 
        Return 0 if ok, or a negative error code if not.
*/
static int UMSDOS_follow_link(
        struct inode * dir,
        struct inode * inode,
        int flag,
        int mode,
        struct inode ** res_inode)
{
        int ret = -ELOOP;
        *res_inode = NULL;
        if (current->link_count < 5) {
                char *path = (char*)kmalloc(PATH_MAX,GFP_KERNEL);
                if (path == NULL){
                        ret = -ENOMEM;
                }else{
                        if (!dir) {
                                dir = current->fs[1].root;
                                dir->i_count++;
                        }
                        if (!inode){
                                PRINTK (("symlink: inode = NULL\n"));
                                ret = -ENOENT;
                        }else if (!S_ISLNK(inode->i_mode)){
                                PRINTK (("symlink: Not ISLNK\n"));
                                *res_inode = inode;
                                inode = NULL;
                                ret = 0;
                        }else{
                                ret = umsdos_readlink_x (inode,path
                                        ,umsdos_file_read_kmem,PATH_MAX-1);
                                if (ret > 0){
                                        path[ret] = '\0';
                                        PRINTK (("follow :%s: %d ",path,ret));
                                        iput(inode);
                                        inode = NULL;
                                        current->link_count++;
                                        ret = open_namei(path,flag,mode,res_inode,dir);
                                        current->link_count--;
                                        dir = NULL;
                                }else{
                                        ret = -EIO;
                                }
                        }
                        kfree (path);
                }
        }
        iput(inode);
        iput(dir);
        PRINTK (("follow_link ret %d\n",ret));
        return ret;
}
 
static int UMSDOS_readlink(struct inode * inode, char * buffer, int buflen)
{
        int ret = -EINVAL;
        if (S_ISLNK(inode->i_mode)) {
                ret = umsdos_readlink_x (inode,buffer,fat_file_read,buflen);
        }
        PRINTK (("readlink %d %x bufsiz %d\n",ret,inode->i_mode,buflen));
        iput(inode);
        return ret;
 
}
 
static struct file_operations umsdos_symlink_operations = {
        NULL,                           /* lseek - default */
        NULL,                           /* read */
        NULL,                           /* write */
        NULL,                           /* readdir - bad */
        NULL,                           /* select - default */
        NULL,                           /* ioctl - default */
        NULL,                           /* mmap */
        NULL,                           /* no special open is needed */
        NULL,                           /* release */
        NULL                            /* fsync */
};
 
struct inode_operations umsdos_symlink_inode_operations = {
        &umsdos_symlink_operations,     /* default file operations */
        NULL,                   /* create */
        NULL,                   /* lookup */
        NULL,                   /* link */
        NULL,                   /* unlink */
        NULL,                   /* symlink */
        NULL,                   /* mkdir */
        NULL,                   /* rmdir */
        NULL,                   /* mknod */
        NULL,                   /* rename */
        UMSDOS_readlink,        /* readlink */
        UMSDOS_follow_link,     /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL                    /* permission */
};
 
 
 

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/fs/umsdos/file.c`
3			`*`
4			`* Written 1992 by Jacques Gelinas`
5			`* inspired from linux/fs/msdos/file.c Werner Almesberger`
6			`*`
7			`* Extended MS-DOS regular file handling primitives`
8			`*/`
9
10			`#include <linux/sched.h>`
11			`#include <linux/fs.h>`
12			`#include <linux/msdos_fs.h>`
13			`#include <linux/errno.h>`
14			`#include <linux/fcntl.h>`
15			`#include <linux/stat.h>`
16			`#include <linux/umsdos_fs.h>`
17			`#include <linux/malloc.h>`
18
19			`#include <asm/segment.h>`
20			`#include <asm/system.h>`
21
22			`#define PRINTK(x)`
23			`#define Printk(x) printk x`
24
25			`/*`
26			`Read the data associate with the symlink.`
27			`Return length read in buffer or a negative error code.`
28			`*/`
29			`static int umsdos_readlink_x (`
30			`struct inode *inode,`
31			`char *buffer,`
32			`int (msdos_read)(struct inode , struct file , char , int),`
33			`int bufsiz)`
34			`{`
35			`int ret = inode->i_size;`
36			`struct file filp;`
37			`filp.f_pos = 0;`
38			`filp.f_reada = 0;`
39			`if (ret > bufsiz) ret = bufsiz;`
40			`if ((*msdos_read) (inode, &filp, buffer,ret) != ret){`
41			`ret = -EIO;`
42			`}`
43			`return ret;`
44			`}`
45			`/*`
46			`Follow a symbolic link chain by calling open_namei recursively`
47			`until an inode is found.`
48
49			`Return 0 if ok, or a negative error code if not.`
50			`*/`
51			`static int UMSDOS_follow_link(`
52			`struct inode * dir,`
53			`struct inode * inode,`
54			`int flag,`
55			`int mode,`
56			`struct inode ** res_inode)`
57			`{`
58			`int ret = -ELOOP;`
59			`*res_inode = NULL;`
60			`if (current->link_count < 5) {`
61			`char path = (char)kmalloc(PATH_MAX,GFP_KERNEL);`
62			`if (path == NULL){`
63			`ret = -ENOMEM;`
64			`}else{`
65			`if (!dir) {`
66			`dir = current->fs[1].root;`
67			`dir->i_count++;`
68			`}`
69			`if (!inode){`
70			`PRINTK (("symlink: inode = NULL\n"));`
71			`ret = -ENOENT;`
72			`}else if (!S_ISLNK(inode->i_mode)){`
73			`PRINTK (("symlink: Not ISLNK\n"));`
74			`*res_inode = inode;`
75			`inode = NULL;`
76			`ret = 0;`
77			`}else{`
78			`ret = umsdos_readlink_x (inode,path`
79			`,umsdos_file_read_kmem,PATH_MAX-1);`
80			`if (ret > 0){`
81			`path[ret] = '\0';`
82			`PRINTK (("follow :%s: %d ",path,ret));`
83			`iput(inode);`
84			`inode = NULL;`
85			`current->link_count++;`
86			`ret = open_namei(path,flag,mode,res_inode,dir);`
87			`current->link_count--;`
88			`dir = NULL;`
89			`}else{`
90			`ret = -EIO;`
91			`}`
92			`}`
93			`kfree (path);`
94			`}`
95			`}`
96			`iput(inode);`
97			`iput(dir);`
98			`PRINTK (("follow_link ret %d\n",ret));`
99			`return ret;`
100			`}`
101
102			`static int UMSDOS_readlink(struct inode * inode, char * buffer, int buflen)`
103			`{`
104			`int ret = -EINVAL;`
105			`if (S_ISLNK(inode->i_mode)) {`
106			`ret = umsdos_readlink_x (inode,buffer,fat_file_read,buflen);`
107			`}`
108			`PRINTK (("readlink %d %x bufsiz %d\n",ret,inode->i_mode,buflen));`
109			`iput(inode);`
110			`return ret;`
111
112			`}`
113
114			`static struct file_operations umsdos_symlink_operations = {`
115			`NULL, /* lseek - default */`
116			`NULL, /* read */`
117			`NULL, /* write */`
118			`NULL, /* readdir - bad */`
119			`NULL, /* select - default */`
120			`NULL, /* ioctl - default */`
121			`NULL, /* mmap */`
122			`NULL, /* no special open is needed */`
123			`NULL, /* release */`
124			`NULL /* fsync */`
125			`};`
126
127			`struct inode_operations umsdos_symlink_inode_operations = {`
128			`&umsdos_symlink_operations, /* default file operations */`
129			`NULL, /* create */`
130			`NULL, /* lookup */`
131			`NULL, /* link */`
132			`NULL, /* unlink */`
133			`NULL, /* symlink */`
134			`NULL, /* mkdir */`
135			`NULL, /* rmdir */`
136			`NULL, /* mknod */`
137			`NULL, /* rename */`
138			`UMSDOS_readlink, /* readlink */`
139			`UMSDOS_follow_link, /* follow_link */`
140			`NULL, /* readpage */`
141			`NULL, /* writepage */`
142			`NULL, /* bmap */`
143			`NULL, /* truncate */`
144			`NULL /* permission */`
145			`};`
146
147
148

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