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 <linux/mount.h>
8 #include <linux/vs_cowbl.h>
9 #include <asm/uaccess.h>
10 #include <asm/unistd.h>
12 #ifdef __ARCH_WANT_SYS_UTIME
15 * sys_utime() can be implemented in user-level using sys_utimes().
16 * Is this for backwards compatibility? If so, why not move it
17 * into the appropriate arch directory (for those architectures that
21 /* If times==NULL, set access and modification to current time,
22 * must be owner or have write permission.
23 * Else, update from *times, must be owner or super user.
25 asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
30 struct iattr newattrs;
32 error = user_path_walk(filename, &nd);
36 error = cow_check_and_break(&nd);
39 inode = nd.dentry->d_inode;
41 /* Don't worry, the checks are done in inode_change_ok() */
42 newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
45 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
48 error = get_user(newattrs.ia_atime.tv_sec, ×->actime);
49 newattrs.ia_atime.tv_nsec = 0;
51 error = get_user(newattrs.ia_mtime.tv_sec, ×->modtime);
52 newattrs.ia_mtime.tv_nsec = 0;
56 newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
59 if (IS_IMMUTABLE(inode))
62 if (current->fsuid != inode->i_uid &&
63 (error = vfs_permission(&nd, MAY_WRITE)) != 0)
66 mutex_lock(&inode->i_mutex);
67 error = notify_change(nd.dentry, &newattrs);
68 mutex_unlock(&inode->i_mutex);
77 /* If times==NULL, set access and modification to current time,
78 * must be owner or have write permission.
79 * Else, update from *times, must be owner or super user.
81 long do_utimes(int dfd, char __user *filename, struct timeval *times)
86 struct iattr newattrs;
88 error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
92 error = cow_check_and_break(&nd);
95 inode = nd.dentry->d_inode;
97 /* Don't worry, the checks are done in inode_change_ok() */
98 newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
101 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
104 newattrs.ia_atime.tv_sec = times[0].tv_sec;
105 newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000;
106 newattrs.ia_mtime.tv_sec = times[1].tv_sec;
107 newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000;
108 newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
111 if (IS_IMMUTABLE(inode))
114 if (current->fsuid != inode->i_uid &&
115 (error = vfs_permission(&nd, MAY_WRITE)) != 0)
118 mutex_lock(&inode->i_mutex);
119 error = notify_change(nd.dentry, &newattrs);
120 mutex_unlock(&inode->i_mutex);
127 asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes)
129 struct timeval times[2];
131 if (utimes && copy_from_user(×, utimes, sizeof(times)))
133 return do_utimes(dfd, filename, utimes ? times : NULL);
136 asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
138 return sys_futimesat(AT_FDCWD, filename, utimes);