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review.shift-gmbh.com / SHIFTPHONES / kernel / common / 82b0547cfae1fb2ee26cad588f6d49a347d24740 / . / fs / utimes.c
blob: 1bcd852fc4a9509199bd334c510a788ca387c153 [file] [log] [blame]
Alexey Dobriyan82b05472006-09-30 23:27:22 -0700[diff] [blame^]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 */
22asmlinkage 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);
66dput_and_out:
67 path_release(&nd);
68out:
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 */
78long 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);
119dput_and_out:
120 path_release(&nd);
121out:
122 return error;
123}
124
125asmlinkage 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
134asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
135{
136 return sys_futimesat(AT_FDCWD, filename, utimes);
137}