[linux.git] / fs / utimes.c

#include <linux/compiler.h>
#include <linux/fs.h>
#include <linux/linkage.h>
#include <linux/namei.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>
	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	}