Eric Lee / smarc-fsl-linux-kernel

Blame view

fs/nfsctl.c 2.37 KB
edit raw normal view history
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
1
2
3
4
5
6
 
  /*
   *	fs/nfsctl.c
   *
   *	This should eventually move to userland.
   *
   */
715b49ef2   Alan Cox   [PATCH] EDAC: ato... 
7
 
  #include <linux/types.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
  #include <linux/file.h>
  #include <linux/fs.h>
  #include <linux/sunrpc/svc.h>
  #include <linux/nfsd/nfsd.h>
  #include <linux/nfsd/syscall.h>
  #include <linux/linkage.h>
  #include <linux/namei.h>
  #include <linux/mount.h>
  #include <linux/syscalls.h>
  #include <asm/uaccess.h>
  
  /*
   * open a file on nfsd fs
   */
  
  static struct file *do_open(char *name, int flags)
  {
  	struct nameidata nd;
16b6287a5   Josef 'Jeff' Sipek   nfsctl: use vfs_p... 
26
 
  	struct vfsmount *mnt;
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
27
 
  	int error;
16b6287a5   Josef 'Jeff' Sipek   nfsctl: use vfs_p... 
28
29
30
 
  	mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
  	if (IS_ERR(mnt))
  		return (struct file *)mnt;
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
31
 








16b6287a5
 
 Josef 'Jeff' Sipek
 
nfsctl: use vfs_p...




32
33




  	error = vfs_path_lookup(mnt->mnt_root, mnt, name, 0, &nd);
  	mntput(mnt);	/* drop do_kern_mount reference */









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93




  	if (error)
  		return ERR_PTR(error);
  
  	if (flags == O_RDWR)
  		error = may_open(&nd,MAY_READ|MAY_WRITE,FMODE_READ|FMODE_WRITE);
  	else
  		error = may_open(&nd, MAY_WRITE, FMODE_WRITE);
  
  	if (!error)
  		return dentry_open(nd.dentry, nd.mnt, flags);
  
  	path_release(&nd);
  	return ERR_PTR(error);
  }
  
  static struct {
  	char *name; int wsize; int rsize;
  } map[] = {
  	[NFSCTL_SVC] = {
  		.name	= ".svc",
  		.wsize	= sizeof(struct nfsctl_svc)
  	},
  	[NFSCTL_ADDCLIENT] = {
  		.name	= ".add",
  		.wsize	= sizeof(struct nfsctl_client)
  	},
  	[NFSCTL_DELCLIENT] = {
  		.name	= ".del",
  		.wsize	= sizeof(struct nfsctl_client)
  	},
  	[NFSCTL_EXPORT] = {
  		.name	= ".export",
  		.wsize	= sizeof(struct nfsctl_export)
  	},
  	[NFSCTL_UNEXPORT] = {
  		.name	= ".unexport",
  		.wsize	= sizeof(struct nfsctl_export)
  	},
  	[NFSCTL_GETFD] = {
  		.name	= ".getfd",
  		.wsize	= sizeof(struct nfsctl_fdparm),
  		.rsize	= NFS_FHSIZE
  	},
  	[NFSCTL_GETFS] = {
  		.name	= ".getfs",
  		.wsize	= sizeof(struct nfsctl_fsparm),
  		.rsize	= sizeof(struct knfsd_fh)
  	},
  };
  
  long
  asmlinkage sys_nfsservctl(int cmd, struct nfsctl_arg __user *arg, void __user *res)
  {
  	struct file *file;
  	void __user *p = &arg->u;
  	int version;
  	int err;
  
  	if (copy_from_user(&version, &arg->ca_version, sizeof(int)))
  		return -EFAULT;









85c6932ef
 
 Peter Staubach
 
[PATCH] nfsservct...




94




  	if (version != NFSCTL_VERSION)









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




95




  		return -EINVAL;









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




96












e8c96f8c2
 
 Tobias Klauser
 
[PATCH] fs: Use A...




97




  	if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name)









1da177e4c
 
 Linus Torvalds
 
Linux-2.6.12-rc2




98
99
100
101
102
103
104
105
106
107
108
109
110




  		return -EINVAL;
  
  	file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY);	
  	if (IS_ERR(file))
  		return PTR_ERR(file);
  	err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos);
  	if (err >= 0 && map[cmd].rsize)
  		err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos);
  	if (err >= 0)
  		err = 0;
  	fput(file);
  	return err;
  }