[mirror_ubuntu-artful-kernel.git] / fs / statfs.c

#include <linux/syscalls.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/statfs.h>
#include <linux/security.h>
#include <linux/uaccess.h>
#include <linux/compat.h>
#include "internal.h"

static int flags_by_mnt(int mnt_flags)
{
	int flags = 0;

	if (mnt_flags & MNT_READONLY)
		flags |= ST_RDONLY;
	if (mnt_flags & MNT_NOSUID)
		flags |= ST_NOSUID;
	if (mnt_flags & MNT_NODEV)
		flags |= ST_NODEV;
	if (mnt_flags & MNT_NOEXEC)
		flags |= ST_NOEXEC;
	if (mnt_flags & MNT_NOATIME)
		flags |= ST_NOATIME;
	if (mnt_flags & MNT_NODIRATIME)
		flags |= ST_NODIRATIME;
	if (mnt_flags & MNT_RELATIME)
		flags |= ST_RELATIME;
	return flags;
}

static int flags_by_sb(int s_flags)
{
	int flags = 0;
	if (s_flags & MS_SYNCHRONOUS)
		flags |= ST_SYNCHRONOUS;
	if (s_flags & MS_MANDLOCK)
		flags |= ST_MANDLOCK;
	return flags;
}

static int calculate_f_flags(struct vfsmount *mnt)
{
	return ST_VALID | flags_by_mnt(mnt->mnt_flags) |
		flags_by_sb(mnt->mnt_sb->s_flags);
}

static int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf)
{
	int retval;

	if (!dentry->d_sb->s_op->statfs)
		return -ENOSYS;

	memset(buf, 0, sizeof(*buf));
	retval = security_sb_statfs(dentry);
	if (retval)
		return retval;
	retval = dentry->d_sb->s_op->statfs(dentry, buf);
	if (retval == 0 && buf->f_frsize == 0)
		buf->f_frsize = buf->f_bsize;
	return retval;
}

int vfs_statfs(const struct path *path, struct kstatfs *buf)
{
	int error;

	error = statfs_by_dentry(path->dentry, buf);
	if (!error)
		buf->f_flags = calculate_f_flags(path->mnt);
	return error;
}
EXPORT_SYMBOL(vfs_statfs);

int user_statfs(const char __user *pathname, struct kstatfs *st)
{
	struct path path;
	int error;
	unsigned int lookup_flags = LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT;
retry:
	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
	if (!error) {
		error = vfs_statfs(&path, st);
		path_put(&path);
		if (retry_estale(error, lookup_flags)) {
			lookup_flags |= LOOKUP_REVAL;
			goto retry;
		}
	}
	return error;
}

int fd_statfs(int fd, struct kstatfs *st)
{
	struct fd f = fdget_raw(fd);
	int error = -EBADF;
	if (f.file) {
		error = vfs_statfs(&f.file->f_path, st);
		fdput(f);
	}
	return error;
}

static int do_statfs_native(struct kstatfs *st, struct statfs __user *p)
{
	struct statfs buf;

	if (sizeof(buf) == sizeof(*st))
		memcpy(&buf, st, sizeof(*st));
	else {
		if (sizeof buf.f_blocks == 4) {
			if ((st->f_blocks | st->f_bfree | st->f_bavail |
			     st->f_bsize | st->f_frsize) &
			    0xffffffff00000000ULL)
				return -EOVERFLOW;
			/*
			 * f_files and f_ffree may be -1; it's okay to stuff
			 * that into 32 bits
			 */
			if (st->f_files != -1 &&
			    (st->f_files & 0xffffffff00000000ULL))
				return -EOVERFLOW;
			if (st->f_ffree != -1 &&
			    (st->f_ffree & 0xffffffff00000000ULL))
				return -EOVERFLOW;
		}

		buf.f_type = st->f_type;
		buf.f_bsize = st->f_bsize;
		buf.f_blocks = st->f_blocks;
		buf.f_bfree = st->f_bfree;
		buf.f_bavail = st->f_bavail;
		buf.f_files = st->f_files;
		buf.f_ffree = st->f_ffree;
		buf.f_fsid = st->f_fsid;
		buf.f_namelen = st->f_namelen;
		buf.f_frsize = st->f_frsize;
		buf.f_flags = st->f_flags;
		memset(buf.f_spare, 0, sizeof(buf.f_spare));
	}
	if (copy_to_user(p, &buf, sizeof(buf)))
		return -EFAULT;
	return 0;
}

static int do_statfs64(struct kstatfs *st, struct statfs64 __user *p)
{
	struct statfs64 buf;
	if (sizeof(buf) == sizeof(*st))
		memcpy(&buf, st, sizeof(*st));
	else {
		buf.f_type = st->f_type;
		buf.f_bsize = st->f_bsize;
		buf.f_blocks = st->f_blocks;
		buf.f_bfree = st->f_bfree;
		buf.f_bavail = st->f_bavail;
		buf.f_files = st->f_files;
		buf.f_ffree = st->f_ffree;
		buf.f_fsid = st->f_fsid;
		buf.f_namelen = st->f_namelen;
		buf.f_frsize = st->f_frsize;
		buf.f_flags = st->f_flags;
		memset(buf.f_spare, 0, sizeof(buf.f_spare));
	}
	if (copy_to_user(p, &buf, sizeof(buf)))
		return -EFAULT;
	return 0;
}

SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf)
{
	struct kstatfs st;
	int error = user_statfs(pathname, &st);
	if (!error)
		error = do_statfs_native(&st, buf);
	return error;
}

SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf)
{
	struct kstatfs st;
	int error;
	if (sz != sizeof(*buf))
		return -EINVAL;
	error = user_statfs(pathname, &st);
	if (!error)
		error = do_statfs64(&st, buf);
	return error;
}

SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
{
	struct kstatfs st;
	int error = fd_statfs(fd, &st);
	if (!error)
		error = do_statfs_native(&st, buf);
	return error;
}

SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
{
	struct kstatfs st;
	int error;

	if (sz != sizeof(*buf))
		return -EINVAL;

	error = fd_statfs(fd, &st);
	if (!error)
		error = do_statfs64(&st, buf);
	return error;
}

int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
{
	struct super_block *s = user_get_super(dev);
	int err;
	if (!s)
		return -EINVAL;

	err = statfs_by_dentry(s->s_root, sbuf);
	drop_super(s);
	return err;
}

SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
{
	struct ustat tmp;
	struct kstatfs sbuf;
	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
	if (err)
		return err;

	memset(&tmp,0,sizeof(struct ustat));
	tmp.f_tfree = sbuf.f_bfree;
	tmp.f_tinode = sbuf.f_ffree;

	return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
}

#ifdef CONFIG_COMPAT
static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
{
	if (sizeof ubuf->f_blocks == 4) {
		if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
		     kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
			return -EOVERFLOW;
		/* f_files and f_ffree may be -1; it's okay
		 * to stuff that into 32 bits */
		if (kbuf->f_files != 0xffffffffffffffffULL
		 && (kbuf->f_files & 0xffffffff00000000ULL))
			return -EOVERFLOW;
		if (kbuf->f_ffree != 0xffffffffffffffffULL
		 && (kbuf->f_ffree & 0xffffffff00000000ULL))
			return -EOVERFLOW;
	}
	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
	    __put_user(kbuf->f_type, &ubuf->f_type) ||
	    __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
	    __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
	    __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
	    __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
	    __put_user(kbuf->f_files, &ubuf->f_files) ||
	    __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
	    __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
	    __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
	    __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
	    __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
	    __put_user(kbuf->f_flags, &ubuf->f_flags) ||
	    __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
		return -EFAULT;
	return 0;
}

/*
 * The following statfs calls are copies of code from fs/statfs.c and
 * should be checked against those from time to time
 */
COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
{
	struct kstatfs tmp;
	int error = user_statfs(pathname, &tmp);
	if (!error)
		error = put_compat_statfs(buf, &tmp);
	return error;
}

COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
{
	struct kstatfs tmp;
	int error = fd_statfs(fd, &tmp);
	if (!error)
		error = put_compat_statfs(buf, &tmp);
	return error;
}

static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
{
	if (sizeof(ubuf->f_bsize) == 4) {
		if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen |
		     kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL)
			return -EOVERFLOW;
		/* f_files and f_ffree may be -1; it's okay
		 * to stuff that into 32 bits */
		if (kbuf->f_files != 0xffffffffffffffffULL
		 && (kbuf->f_files & 0xffffffff00000000ULL))
			return -EOVERFLOW;
		if (kbuf->f_ffree != 0xffffffffffffffffULL
		 && (kbuf->f_ffree & 0xffffffff00000000ULL))
			return -EOVERFLOW;
	}
	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
	    __put_user(kbuf->f_type, &ubuf->f_type) ||
	    __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
	    __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
	    __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
	    __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
	    __put_user(kbuf->f_files, &ubuf->f_files) ||
	    __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
	    __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
	    __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
	    __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
	    __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
	    __put_user(kbuf->f_flags, &ubuf->f_flags) ||
	    __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
		return -EFAULT;
	return 0;
}

COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
{
	struct kstatfs tmp;
	int error;

	if (sz != sizeof(*buf))
		return -EINVAL;

	error = user_statfs(pathname, &tmp);
	if (!error)
		error = put_compat_statfs64(buf, &tmp);
	return error;
}

COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
{
	struct kstatfs tmp;
	int error;

	if (sz != sizeof(*buf))
		return -EINVAL;

	error = fd_statfs(fd, &tmp);
	if (!error)
		error = put_compat_statfs64(buf, &tmp);
	return error;
}

/*
 * This is a copy of sys_ustat, just dealing with a structure layout.
 * Given how simple this syscall is that apporach is more maintainable
 * than the various conversion hacks.
 */
COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
{
	struct compat_ustat tmp;
	struct kstatfs sbuf;
	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
	if (err)
		return err;

	memset(&tmp, 0, sizeof(struct compat_ustat));
	tmp.f_tfree = sbuf.f_bfree;
	tmp.f_tinode = sbuf.f_ffree;
	if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
		return -EFAULT;
	return 0;
}
#endif
Commit	Line	Data
7ed1ee61	1	#include <linux/syscalls.h>
630d9c47	2	#include <linux/export.h>
7ed1ee61 AV	3	#include <linux/fs.h>
7ed1ee61 AV	4	#include <linux/file.h>
365b1818	5	#include <linux/mount.h>
7ed1ee61 AV	6	#include <linux/namei.h>
	7	#include <linux/statfs.h>
	8	#include <linux/security.h>
	9	#include <linux/uaccess.h>
4ada54ee	10	#include <linux/compat.h>
cf31e70d	11	#include "internal.h"
7ed1ee61	12
365b1818 CH	13	static int flags_by_mnt(int mnt_flags)
	14	{
	15	int flags = 0;
	16
	17	if (mnt_flags & MNT_READONLY)
	18	flags \|= ST_RDONLY;
	19	if (mnt_flags & MNT_NOSUID)
	20	flags \|= ST_NOSUID;
	21	if (mnt_flags & MNT_NODEV)
	22	flags \|= ST_NODEV;
	23	if (mnt_flags & MNT_NOEXEC)
	24	flags \|= ST_NOEXEC;
	25	if (mnt_flags & MNT_NOATIME)
	26	flags \|= ST_NOATIME;
	27	if (mnt_flags & MNT_NODIRATIME)
	28	flags \|= ST_NODIRATIME;
	29	if (mnt_flags & MNT_RELATIME)
	30	flags \|= ST_RELATIME;
	31	return flags;
	32	}
	33
	34	static int flags_by_sb(int s_flags)
	35	{
	36	int flags = 0;
	37	if (s_flags & MS_SYNCHRONOUS)
	38	flags \|= ST_SYNCHRONOUS;
	39	if (s_flags & MS_MANDLOCK)
	40	flags \|= ST_MANDLOCK;
	41	return flags;
	42	}
	43
	44	static int calculate_f_flags(struct vfsmount *mnt)
	45	{
	46	return ST_VALID \| flags_by_mnt(mnt->mnt_flags) \|
	47	flags_by_sb(mnt->mnt_sb->s_flags);
	48	}
	49
cf31e70d	50	static int statfs_by_dentry(struct dentry dentry, struct kstatfs buf)
7ed1ee61	51	{
ebabe9a9 CH	52	int retval;
	53
	54	if (!dentry->d_sb->s_op->statfs)
	55	return -ENOSYS;
	56
	57	memset(buf, 0, sizeof(*buf));
	58	retval = security_sb_statfs(dentry);
	59	if (retval)
	60	return retval;
	61	retval = dentry->d_sb->s_op->statfs(dentry, buf);
	62	if (retval == 0 && buf->f_frsize == 0)
	63	buf->f_frsize = buf->f_bsize;
7ed1ee61 AV	64	return retval;
	65	}
	66
f0bb5aaf	67	int vfs_statfs(const struct path path, struct kstatfs buf)
ebabe9a9	68	{
365b1818 CH	69	int error;
	70
	71	error = statfs_by_dentry(path->dentry, buf);
	72	if (!error)
	73	buf->f_flags = calculate_f_flags(path->mnt);
	74	return error;
ebabe9a9	75	}
7ed1ee61 AV	76	EXPORT_SYMBOL(vfs_statfs);
7ed1ee61 AV	77
c8b91acc	78	int user_statfs(const char __user pathname, struct kstatfs st)
7ed1ee61	79	{
c8b91acc	80	struct path path;
96948fc6 JL	81	int error;
	82	unsigned int lookup_flags = LOOKUP_FOLLOW\|LOOKUP_AUTOMOUNT;
	83	retry:
	84	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
c8b91acc AV	85	if (!error) {
	86	error = vfs_statfs(&path, st);
	87	path_put(&path);
96948fc6 JL	88	if (retry_estale(error, lookup_flags)) {
	89	lookup_flags \|= LOOKUP_REVAL;
	90	goto retry;
	91	}
c8b91acc AV	92	}
	93	return error;
	94	}
7ed1ee61	95
c8b91acc AV	96	int fd_statfs(int fd, struct kstatfs *st)
c8b91acc AV	97	{
9d05746e	98	struct fd f = fdget_raw(fd);
c8b91acc	99	int error = -EBADF;
2903ff01 AV	100	if (f.file) {
	101	error = vfs_statfs(&f.file->f_path, st);
	102	fdput(f);
c8b91acc AV	103	}
	104	return error;
	105	}
7ed1ee61	106
c8b91acc AV	107	static int do_statfs_native(struct kstatfs st, struct statfs __user p)
	108	{
	109	struct statfs buf;
	110
	111	if (sizeof(buf) == sizeof(*st))
	112	memcpy(&buf, st, sizeof(*st));
7ed1ee61	113	else {
c8b91acc AV	114	if (sizeof buf.f_blocks == 4) {
	115	if ((st->f_blocks \| st->f_bfree \| st->f_bavail \|
	116	st->f_bsize \| st->f_frsize) &
7ed1ee61 AV	117	0xffffffff00000000ULL)
	118	return -EOVERFLOW;
	119	/*
	120	* f_files and f_ffree may be -1; it's okay to stuff
	121	* that into 32 bits
	122	*/
c8b91acc AV	123	if (st->f_files != -1 &&
c8b91acc AV	124	(st->f_files & 0xffffffff00000000ULL))
7ed1ee61	125	return -EOVERFLOW;
c8b91acc AV	126	if (st->f_ffree != -1 &&
c8b91acc AV	127	(st->f_ffree & 0xffffffff00000000ULL))
7ed1ee61 AV	128	return -EOVERFLOW;
	129	}
	130
c8b91acc AV	131	buf.f_type = st->f_type;
	132	buf.f_bsize = st->f_bsize;
	133	buf.f_blocks = st->f_blocks;
	134	buf.f_bfree = st->f_bfree;
	135	buf.f_bavail = st->f_bavail;
	136	buf.f_files = st->f_files;
	137	buf.f_ffree = st->f_ffree;
	138	buf.f_fsid = st->f_fsid;
	139	buf.f_namelen = st->f_namelen;
	140	buf.f_frsize = st->f_frsize;
	141	buf.f_flags = st->f_flags;
	142	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	143	}
c8b91acc AV	144	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	145	return -EFAULT;
7ed1ee61 AV	146	return 0;
	147	}
	148
c8b91acc	149	static int do_statfs64(struct kstatfs st, struct statfs64 __user p)
7ed1ee61	150	{
c8b91acc AV	151	struct statfs64 buf;
	152	if (sizeof(buf) == sizeof(*st))
	153	memcpy(&buf, st, sizeof(*st));
7ed1ee61	154	else {
c8b91acc AV	155	buf.f_type = st->f_type;
	156	buf.f_bsize = st->f_bsize;
	157	buf.f_blocks = st->f_blocks;
	158	buf.f_bfree = st->f_bfree;
	159	buf.f_bavail = st->f_bavail;
	160	buf.f_files = st->f_files;
	161	buf.f_ffree = st->f_ffree;
	162	buf.f_fsid = st->f_fsid;
	163	buf.f_namelen = st->f_namelen;
	164	buf.f_frsize = st->f_frsize;
	165	buf.f_flags = st->f_flags;
	166	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	167	}
c8b91acc AV	168	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	169	return -EFAULT;
7ed1ee61 AV	170	return 0;
	171	}
	172
	173	SYSCALL_DEFINE2(statfs, const char __user , pathname, struct statfs __user , buf)
	174	{
c8b91acc AV	175	struct kstatfs st;
	176	int error = user_statfs(pathname, &st);
	177	if (!error)
	178	error = do_statfs_native(&st, buf);
7ed1ee61 AV	179	return error;
	180	}
	181
	182	SYSCALL_DEFINE3(statfs64, const char __user , pathname, size_t, sz, struct statfs64 __user , buf)
	183	{
c8b91acc AV	184	struct kstatfs st;
c8b91acc AV	185	int error;
7ed1ee61 AV	186	if (sz != sizeof(*buf))
7ed1ee61 AV	187	return -EINVAL;
c8b91acc AV	188	error = user_statfs(pathname, &st);
	189	if (!error)
	190	error = do_statfs64(&st, buf);
7ed1ee61 AV	191	return error;
	192	}
	193
	194	SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
	195	{
c8b91acc AV	196	struct kstatfs st;
	197	int error = fd_statfs(fd, &st);
	198	if (!error)
	199	error = do_statfs_native(&st, buf);
7ed1ee61 AV	200	return error;
	201	}
	202
	203	SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
	204	{
c8b91acc	205	struct kstatfs st;
7ed1ee61 AV	206	int error;
	207
	208	if (sz != sizeof(*buf))
	209	return -EINVAL;
	210
c8b91acc AV	211	error = fd_statfs(fd, &st);
	212	if (!error)
	213	error = do_statfs64(&st, buf);
7ed1ee61 AV	214	return error;
	215	}
	216
cf31e70d	217	int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
7ed1ee61	218	{
cf31e70d	219	struct super_block *s = user_get_super(dev);
7ed1ee61	220	int err;
7ed1ee61 AV	221	if (!s)
	222	return -EINVAL;
	223
cf31e70d	224	err = statfs_by_dentry(s->s_root, sbuf);
7ed1ee61	225	drop_super(s);
cf31e70d AV	226	return err;
	227	}
	228
	229	SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
	230	{
	231	struct ustat tmp;
	232	struct kstatfs sbuf;
	233	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
7ed1ee61 AV	234	if (err)
	235	return err;
	236
	237	memset(&tmp,0,sizeof(struct ustat));
	238	tmp.f_tfree = sbuf.f_bfree;
	239	tmp.f_tinode = sbuf.f_ffree;
	240
	241	return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
	242	}
4ada54ee AV	243
	244	#ifdef CONFIG_COMPAT
	245	static int put_compat_statfs(struct compat_statfs __user ubuf, struct kstatfs kbuf)
	246	{
	247	if (sizeof ubuf->f_blocks == 4) {
	248	if ((kbuf->f_blocks \| kbuf->f_bfree \| kbuf->f_bavail \|
	249	kbuf->f_bsize \| kbuf->f_frsize) & 0xffffffff00000000ULL)
	250	return -EOVERFLOW;
	251	/* f_files and f_ffree may be -1; it's okay
	252	* to stuff that into 32 bits */
	253	if (kbuf->f_files != 0xffffffffffffffffULL
	254	&& (kbuf->f_files & 0xffffffff00000000ULL))
	255	return -EOVERFLOW;
	256	if (kbuf->f_ffree != 0xffffffffffffffffULL
	257	&& (kbuf->f_ffree & 0xffffffff00000000ULL))
	258	return -EOVERFLOW;
	259	}
	260	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) \|\|
	261	__put_user(kbuf->f_type, &ubuf->f_type) \|\|
	262	__put_user(kbuf->f_bsize, &ubuf->f_bsize) \|\|
	263	__put_user(kbuf->f_blocks, &ubuf->f_blocks) \|\|
	264	__put_user(kbuf->f_bfree, &ubuf->f_bfree) \|\|
	265	__put_user(kbuf->f_bavail, &ubuf->f_bavail) \|\|
	266	__put_user(kbuf->f_files, &ubuf->f_files) \|\|
	267	__put_user(kbuf->f_ffree, &ubuf->f_ffree) \|\|
	268	__put_user(kbuf->f_namelen, &ubuf->f_namelen) \|\|
	269	__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) \|\|
	270	__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) \|\|
	271	__put_user(kbuf->f_frsize, &ubuf->f_frsize) \|\|
	272	__put_user(kbuf->f_flags, &ubuf->f_flags) \|\|
	273	__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
	274	return -EFAULT;
	275	return 0;
	276	}
	277
	278	/*
	279	* The following statfs calls are copies of code from fs/statfs.c and
	280	* should be checked against those from time to time
	281	*/
	282	COMPAT_SYSCALL_DEFINE2(statfs, const char __user , pathname, struct compat_statfs __user , buf)
	283	{
	284	struct kstatfs tmp;
	285	int error = user_statfs(pathname, &tmp);
	286	if (!error)
	287	error = put_compat_statfs(buf, &tmp);
	288	return error;
	289	}
	290
	291	COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
	292	{
	293	struct kstatfs tmp;
	294	int error = fd_statfs(fd, &tmp);
	295	if (!error)
	296	error = put_compat_statfs(buf, &tmp);
	297	return error;
	298	}
	299
	300	static int put_compat_statfs64(struct compat_statfs64 __user ubuf, struct kstatfs kbuf)
	301	{
	302	if (sizeof(ubuf->f_bsize) == 4) {
	303	if ((kbuf->f_type \| kbuf->f_bsize \| kbuf->f_namelen \|
	304	kbuf->f_frsize \| kbuf->f_flags) & 0xffffffff00000000ULL)
	305	return -EOVERFLOW;
	306	/* f_files and f_ffree may be -1; it's okay
307	* to stuff that into 32 bits */
308	if (kbuf->f_files != 0xffffffffffffffffULL
309	&& (kbuf->f_files & 0xffffffff00000000ULL))
310	return -EOVERFLOW;
311	if (kbuf->f_ffree != 0xffffffffffffffffULL
312	&& (kbuf->f_ffree & 0xffffffff00000000ULL))
313	return -EOVERFLOW;
314	}
315	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) \|\|
316	__put_user(kbuf->f_type, &ubuf->f_type) \|\|
317	__put_user(kbuf->f_bsize, &ubuf->f_bsize) \|\|
318	__put_user(kbuf->f_blocks, &ubuf->f_blocks) \|\|
319	__put_user(kbuf->f_bfree, &ubuf->f_bfree) \|\|
320	__put_user(kbuf->f_bavail, &ubuf->f_bavail) \|\|
321	__put_user(kbuf->f_files, &ubuf->f_files) \|\|
322	__put_user(kbuf->f_ffree, &ubuf->f_ffree) \|\|
323	__put_user(kbuf->f_namelen, &ubuf->f_namelen) \|\|
324	__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) \|\|
325	__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) \|\|
326	__put_user(kbuf->f_frsize, &ubuf->f_frsize) \|\|
327	__put_user(kbuf->f_flags, &ubuf->f_flags) \|\|
328	__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
329	return -EFAULT;
330	return 0;
331	}
332
333	COMPAT_SYSCALL_DEFINE3(statfs64, const char __user , pathname, compat_size_t, sz, struct compat_statfs64 __user , buf)
334	{
335	struct kstatfs tmp;
336	int error;
337
338	if (sz != sizeof(*buf))
339	return -EINVAL;
340
341	error = user_statfs(pathname, &tmp);
342	if (!error)
343	error = put_compat_statfs64(buf, &tmp);
344	return error;
345	}
346
347	COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
348	{
349	struct kstatfs tmp;
350	int error;
351
352	if (sz != sizeof(*buf))
353	return -EINVAL;
354
355	error = fd_statfs(fd, &tmp);
356	if (!error)
357	error = put_compat_statfs64(buf, &tmp);
358	return error;
359	}
360
361	/*
362	* This is a copy of sys_ustat, just dealing with a structure layout.
363	* Given how simple this syscall is that apporach is more maintainable
364	* than the various conversion hacks.
365	*/
366	COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
367	{
368	struct compat_ustat tmp;
369	struct kstatfs sbuf;
370	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
371	if (err)
372	return err;
373
374	memset(&tmp, 0, sizeof(struct compat_ustat));
375	tmp.f_tfree = sbuf.f_bfree;
376	tmp.f_tinode = sbuf.f_ffree;
377	if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
378	return -EFAULT;
379	return 0;
380	}
381	#endif