[PATCH] AUTOFS: Make sure all dentries refs are released before calling kill_anon_super()
[linux-2.6] / fs / utimes.c
1 #include <linux/compiler.h>
2 #include <linux/fs.h>
3 #include <linux/linkage.h>
4 #include <linux/namei.h>
5 #include <linux/utime.h>
6 #include <asm/uaccess.h>
7 #include <asm/unistd.h>
8
9 #ifdef __ARCH_WANT_SYS_UTIME
10
11 /*
12  * sys_utime() can be implemented in user-level using sys_utimes().
13  * Is this for backwards compatibility?  If so, why not move it
14  * into the appropriate arch directory (for those architectures that
15  * need it).
16  */
17
18 /* If times==NULL, set access and modification to current time,
19  * must be owner or have write permission.
20  * Else, update from *times, must be owner or super user.
21  */
22 asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
23 {
24         int error;
25         struct nameidata nd;
26         struct inode * inode;
27         struct iattr newattrs;
28
29         error = user_path_walk(filename, &nd);
30         if (error)
31                 goto out;
32         inode = nd.dentry->d_inode;
33
34         error = -EROFS;
35         if (IS_RDONLY(inode))
36                 goto dput_and_out;
37
38         /* Don't worry, the checks are done in inode_change_ok() */
39         newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
40         if (times) {
41                 error = -EPERM;
42                 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
43                         goto dput_and_out;
44
45                 error = get_user(newattrs.ia_atime.tv_sec, &times->actime);
46                 newattrs.ia_atime.tv_nsec = 0;
47                 if (!error)
48                         error = get_user(newattrs.ia_mtime.tv_sec, &times->modtime);
49                 newattrs.ia_mtime.tv_nsec = 0;
50                 if (error)
51                         goto dput_and_out;
52
53                 newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
54         } else {
55                 error = -EACCES;
56                 if (IS_IMMUTABLE(inode))
57                         goto dput_and_out;
58
59                 if (current->fsuid != inode->i_uid &&
60                     (error = vfs_permission(&nd, MAY_WRITE)) != 0)
61                         goto dput_and_out;
62         }
63         mutex_lock(&inode->i_mutex);
64         error = notify_change(nd.dentry, &newattrs);
65         mutex_unlock(&inode->i_mutex);
66 dput_and_out:
67         path_release(&nd);
68 out:
69         return error;
70 }
71
72 #endif
73
74 /* If times==NULL, set access and modification to current time,
75  * must be owner or have write permission.
76  * Else, update from *times, must be owner or super user.
77  */
78 long do_utimes(int dfd, char __user *filename, struct timeval *times)
79 {
80         int error;
81         struct nameidata nd;
82         struct inode * inode;
83         struct iattr newattrs;
84
85         error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
86
87         if (error)
88                 goto out;
89         inode = nd.dentry->d_inode;
90
91         error = -EROFS;
92         if (IS_RDONLY(inode))
93                 goto dput_and_out;
94
95         /* Don't worry, the checks are done in inode_change_ok() */
96         newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
97         if (times) {
98                 error = -EPERM;
99                 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
100                         goto dput_and_out;
101
102                 newattrs.ia_atime.tv_sec = times[0].tv_sec;
103                 newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000;
104                 newattrs.ia_mtime.tv_sec = times[1].tv_sec;
105                 newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000;
106                 newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
107         } else {
108                 error = -EACCES;
109                 if (IS_IMMUTABLE(inode))
110                         goto dput_and_out;
111
112                 if (current->fsuid != inode->i_uid &&
113                     (error = vfs_permission(&nd, MAY_WRITE)) != 0)
114                         goto dput_and_out;
115         }
116         mutex_lock(&inode->i_mutex);
117         error = notify_change(nd.dentry, &newattrs);
118         mutex_unlock(&inode->i_mutex);
119 dput_and_out:
120         path_release(&nd);
121 out:
122         return error;
123 }
124
125 asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes)
126 {
127         struct timeval times[2];
128
129         if (utimes && copy_from_user(&times, utimes, sizeof(times)))
130                 return -EFAULT;
131         return do_utimes(dfd, filename, utimes ? times : NULL);
132 }
133
134 asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
135 {
136         return sys_futimesat(AT_FDCWD, filename, utimes);
137 }