[deliverable/linux.git] / fs / utimes.c

#include <linux/compiler.h>
#include <linux/fs.h>
#include <linux/linkage.h>
#include <linux/namei.h>
#include <linux/sched.h>
#include <linux/utime.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>

#ifdef __ARCH_WANT_SYS_UTIME

/*
 * sys_utime() can be implemented in user-level using sys_utimes().
 * Is this for backwards compatibility?  If so, why not move it
 * into the appropriate arch directory (for those architectures that
 * need it).
 */

/* If times==NULL, set access and modification to current time,
 * must be owner or have write permission.
 * Else, update from *times, must be owner or super user.
 */
asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
{
	int error;
	struct nameidata nd;
	struct inode * inode;
	struct iattr newattrs;

	error = user_path_walk(filename, &nd);
	if (error)
		goto out;
	inode = nd.dentry->d_inode;

	error = -EROFS;
	if (IS_RDONLY(inode))
		goto dput_and_out;

	/* Don't worry, the checks are done in inode_change_ok() */
	newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
	if (times) {
		error = -EPERM;
		if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
			goto dput_and_out;

		error = get_user(newattrs.ia_atime.tv_sec, &times->actime);
		newattrs.ia_atime.tv_nsec = 0;
		if (!error)
			error = get_user(newattrs.ia_mtime.tv_sec, &times->modtime);
		newattrs.ia_mtime.tv_nsec = 0;
		if (error)
			goto dput_and_out;

		newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
	} else {
                error = -EACCES;
                if (IS_IMMUTABLE(inode))
                        goto dput_and_out;

		if (current->fsuid != inode->i_uid &&
		    (error = vfs_permission(&nd, MAY_WRITE)) != 0)
			goto dput_and_out;
	}
	mutex_lock(&inode->i_mutex);
	error = notify_change(nd.dentry, &newattrs);
	mutex_unlock(&inode->i_mutex);
dput_and_out:
	path_release(&nd);
out:
	return error;
}

#endif

/* If times==NULL, set access and modification to current time,
 * must be owner or have write permission.
 * Else, update from *times, must be owner or super user.
 */
long do_utimes(int dfd, char __user *filename, struct timeval *times)
{
	int error;
	struct nameidata nd;
	struct inode * inode;
	struct iattr newattrs;

	error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);

	if (error)
		goto out;
	inode = nd.dentry->d_inode;

	error = -EROFS;
	if (IS_RDONLY(inode))
		goto dput_and_out;

	/* Don't worry, the checks are done in inode_change_ok() */
	newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
	if (times) {
		error = -EPERM;
                if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
                        goto dput_and_out;

		newattrs.ia_atime.tv_sec = times[0].tv_sec;
		newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000;
		newattrs.ia_mtime.tv_sec = times[1].tv_sec;
		newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000;
		newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
	} else {
		error = -EACCES;
                if (IS_IMMUTABLE(inode))
                        goto dput_and_out;

		if (current->fsuid != inode->i_uid &&
		    (error = vfs_permission(&nd, MAY_WRITE)) != 0)
			goto dput_and_out;
	}
	mutex_lock(&inode->i_mutex);
	error = notify_change(nd.dentry, &newattrs);
	mutex_unlock(&inode->i_mutex);
dput_and_out:
	path_release(&nd);
out:
	return error;
}

asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes)
{
	struct timeval times[2];

	if (utimes && copy_from_user(&times, utimes, sizeof(times)))
		return -EFAULT;
	return do_utimes(dfd, filename, utimes ? times : NULL);
}

asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
{
	return sys_futimesat(AT_FDCWD, filename, utimes);
}
Commit	Line	Data
82b0547c AD	1	#include <linux/compiler.h>
	2	#include <linux/fs.h>
	3	#include <linux/linkage.h>
	4	#include <linux/namei.h>
914e2637	5	#include <linux/sched.h>
82b0547c AD	6	#include <linux/utime.h>
	7	#include <asm/uaccess.h>
	8	#include <asm/unistd.h>
	9
	10	#ifdef __ARCH_WANT_SYS_UTIME
	11
	12	/*
	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
	16	* need it).
	17	*/
	18
	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.
	22	*/
	23	asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
	24	{
	25	int error;
	26	struct nameidata nd;
	27	struct inode * inode;
	28	struct iattr newattrs;
	29
	30	error = user_path_walk(filename, &nd);
	31	if (error)
	32	goto out;
	33	inode = nd.dentry->d_inode;
	34
	35	error = -EROFS;
	36	if (IS_RDONLY(inode))
	37	goto dput_and_out;
	38
	39	/* Don't worry, the checks are done in inode_change_ok() */
	40	newattrs.ia_valid = ATTR_CTIME \| ATTR_MTIME \| ATTR_ATIME;
	41	if (times) {
	42	error = -EPERM;
	43	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
	44	goto dput_and_out;
	45
	46	error = get_user(newattrs.ia_atime.tv_sec, &times->actime);
	47	newattrs.ia_atime.tv_nsec = 0;
	48	if (!error)
	49	error = get_user(newattrs.ia_mtime.tv_sec, &times->modtime);
	50	newattrs.ia_mtime.tv_nsec = 0;
	51	if (error)
	52	goto dput_and_out;
	53
	54	newattrs.ia_valid \|= ATTR_ATIME_SET \| ATTR_MTIME_SET;
	55	} else {
	56	error = -EACCES;
	57	if (IS_IMMUTABLE(inode))
	58	goto dput_and_out;
	59
	60	if (current->fsuid != inode->i_uid &&
	61	(error = vfs_permission(&nd, MAY_WRITE)) != 0)
	62	goto dput_and_out;
	63	}
	64	mutex_lock(&inode->i_mutex);
	65	error = notify_change(nd.dentry, &newattrs);
	66	mutex_unlock(&inode->i_mutex);
	67	dput_and_out:
	68	path_release(&nd);
	69	out:
70	return error;
71	}
72
73	#endif
74
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.
78	*/
79	long do_utimes(int dfd, char __user filename, struct timeval times)
80	{
81	int error;
82	struct nameidata nd;
83	struct inode * inode;
84	struct iattr newattrs;
85
86	error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
87
88	if (error)
89	goto out;
90	inode = nd.dentry->d_inode;
91
92	error = -EROFS;
93	if (IS_RDONLY(inode))
94	goto dput_and_out;
95
96	/* Don't worry, the checks are done in inode_change_ok() */
97	newattrs.ia_valid = ATTR_CTIME \| ATTR_MTIME \| ATTR_ATIME;
98	if (times) {
99	error = -EPERM;
100	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
101	goto dput_and_out;
102
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;
108	} else {
109	error = -EACCES;
110	if (IS_IMMUTABLE(inode))
111	goto dput_and_out;
112
113	if (current->fsuid != inode->i_uid &&
114	(error = vfs_permission(&nd, MAY_WRITE)) != 0)
115	goto dput_and_out;
116	}
117	mutex_lock(&inode->i_mutex);
118	error = notify_change(nd.dentry, &newattrs);
119	mutex_unlock(&inode->i_mutex);
120	dput_and_out:
121	path_release(&nd);
122	out:
123	return error;
124	}
125
126	asmlinkage long sys_futimesat(int dfd, char __user filename, struct timeval __user utimes)
127	{
128	struct timeval times[2];
129
130	if (utimes && copy_from_user(&times, utimes, sizeof(times)))
131	return -EFAULT;
132	return do_utimes(dfd, filename, utimes ? times : NULL);
133	}
134
135	asmlinkage long sys_utimes(char __user filename, struct timeval __user utimes)
136	{
137	return sys_futimesat(AT_FDCWD, filename, utimes);
138	}