1 #include <linux/compiler.h>
3 #include <linux/linkage.h>
4 #include <linux/namei.h>
5 #include <linux/sched.h>
6 #include <linux/utime.h>
7 #include <asm/uaccess.h>
8 #include <asm/unistd.h>
10 #ifdef __ARCH_WANT_SYS_UTIME
13 * sys_utime() can be implemented in user-level using sys_utimes().
14 * Is this for backwards compatibility? If so, why not move it
15 * into the appropriate arch directory (for those architectures that
19 /* If times==NULL, set access and modification to current time,
20 * must be owner or have write permission.
21 * Else, update from *times, must be owner or super user.
23 asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
28 struct iattr newattrs;
30 error = user_path_walk(filename, &nd);
33 inode = nd.dentry->d_inode;
39 /* Don't worry, the checks are done in inode_change_ok() */
40 newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
43 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
46 error = get_user(newattrs.ia_atime.tv_sec, ×->actime);
47 newattrs.ia_atime.tv_nsec = 0;
49 error = get_user(newattrs.ia_mtime.tv_sec, ×->modtime);
50 newattrs.ia_mtime.tv_nsec = 0;
54 newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
57 if (IS_IMMUTABLE(inode))
60 if (current->fsuid != inode->i_uid &&
61 (error = vfs_permission(&nd, MAY_WRITE)) != 0)
64 mutex_lock(&inode->i_mutex);
65 error = notify_change(nd.dentry, &newattrs);
66 mutex_unlock(&inode->i_mutex);
75 /* If times==NULL, set access and modification to current time,
76 * must be owner or have write permission.
77 * Else, update from *times, must be owner or super user.
79 long do_utimes(int dfd, char __user *filename, struct timeval *times)
84 struct iattr newattrs;
86 error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
90 inode = nd.dentry->d_inode;
96 /* Don't worry, the checks are done in inode_change_ok() */
97 newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
100 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
103 newattrs.ia_atime.tv_sec = times[0].tv_sec;
104 newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000;
105 newattrs.ia_mtime.tv_sec = times[1].tv_sec;
106 newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000;
107 newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
110 if (IS_IMMUTABLE(inode))
113 if (current->fsuid != inode->i_uid &&
114 (error = vfs_permission(&nd, MAY_WRITE)) != 0)
117 mutex_lock(&inode->i_mutex);
118 error = notify_change(nd.dentry, &newattrs);
119 mutex_unlock(&inode->i_mutex);
126 asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes)
128 struct timeval times[2];
130 if (utimes && copy_from_user(×, utimes, sizeof(times)))
132 return do_utimes(dfd, filename, utimes ? times : NULL);
135 asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
137 return sys_futimesat(AT_FDCWD, filename, utimes);