[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;
	if (s_flags & MS_RDONLY)
		flags |= ST_RDONLY;
	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)
{
	struct compat_statfs buf;
	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;
	}
	memset(&buf, 0, sizeof(struct compat_statfs));
	buf.f_type = kbuf->f_type;
	buf.f_bsize = kbuf->f_bsize;
	buf.f_blocks = kbuf->f_blocks;
	buf.f_bfree = kbuf->f_bfree;
	buf.f_bavail = kbuf->f_bavail;
	buf.f_files = kbuf->f_files;
	buf.f_ffree = kbuf->f_ffree;
	buf.f_namelen = kbuf->f_namelen;
	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	buf.f_frsize = kbuf->f_frsize;
	buf.f_flags = kbuf->f_flags;
	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs)))
		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)
{
	struct compat_statfs64 buf;
	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;
	}
	memset(&buf, 0, sizeof(struct compat_statfs64));
	buf.f_type = kbuf->f_type;
	buf.f_bsize = kbuf->f_bsize;
	buf.f_blocks = kbuf->f_blocks;
	buf.f_bfree = kbuf->f_bfree;
	buf.f_bavail = kbuf->f_bavail;
	buf.f_files = kbuf->f_files;
	buf.f_ffree = kbuf->f_ffree;
	buf.f_namelen = kbuf->f_namelen;
	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	buf.f_frsize = kbuf->f_frsize;
	buf.f_flags = kbuf->f_flags;
	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs64)))
		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;
a8e2b636 CM	41	if (s_flags & MS_RDONLY)
a8e2b636 CM	42	flags \|= ST_RDONLY;
365b1818 CH	43	return flags;
	44	}
	45
	46	static int calculate_f_flags(struct vfsmount *mnt)
	47	{
	48	return ST_VALID \| flags_by_mnt(mnt->mnt_flags) \|
	49	flags_by_sb(mnt->mnt_sb->s_flags);
	50	}
	51
cf31e70d	52	static int statfs_by_dentry(struct dentry dentry, struct kstatfs buf)
7ed1ee61	53	{
ebabe9a9 CH	54	int retval;
	55
	56	if (!dentry->d_sb->s_op->statfs)
	57	return -ENOSYS;
	58
	59	memset(buf, 0, sizeof(*buf));
	60	retval = security_sb_statfs(dentry);
	61	if (retval)
	62	return retval;
	63	retval = dentry->d_sb->s_op->statfs(dentry, buf);
	64	if (retval == 0 && buf->f_frsize == 0)
	65	buf->f_frsize = buf->f_bsize;
7ed1ee61 AV	66	return retval;
	67	}
	68
f0bb5aaf	69	int vfs_statfs(const struct path path, struct kstatfs buf)
ebabe9a9	70	{
365b1818 CH	71	int error;
	72
	73	error = statfs_by_dentry(path->dentry, buf);
	74	if (!error)
	75	buf->f_flags = calculate_f_flags(path->mnt);
	76	return error;
ebabe9a9	77	}
7ed1ee61 AV	78	EXPORT_SYMBOL(vfs_statfs);
7ed1ee61 AV	79
c8b91acc	80	int user_statfs(const char __user pathname, struct kstatfs st)
7ed1ee61	81	{
c8b91acc	82	struct path path;
96948fc6 JL	83	int error;
	84	unsigned int lookup_flags = LOOKUP_FOLLOW\|LOOKUP_AUTOMOUNT;
	85	retry:
	86	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
c8b91acc AV	87	if (!error) {
	88	error = vfs_statfs(&path, st);
	89	path_put(&path);
96948fc6 JL	90	if (retry_estale(error, lookup_flags)) {
	91	lookup_flags \|= LOOKUP_REVAL;
	92	goto retry;
	93	}
c8b91acc AV	94	}
	95	return error;
	96	}
7ed1ee61	97
c8b91acc AV	98	int fd_statfs(int fd, struct kstatfs *st)
c8b91acc AV	99	{
9d05746e	100	struct fd f = fdget_raw(fd);
c8b91acc	101	int error = -EBADF;
2903ff01 AV	102	if (f.file) {
	103	error = vfs_statfs(&f.file->f_path, st);
	104	fdput(f);
c8b91acc AV	105	}
	106	return error;
	107	}
7ed1ee61	108
c8b91acc AV	109	static int do_statfs_native(struct kstatfs st, struct statfs __user p)
	110	{
	111	struct statfs buf;
	112
	113	if (sizeof(buf) == sizeof(*st))
	114	memcpy(&buf, st, sizeof(*st));
7ed1ee61	115	else {
c8b91acc AV	116	if (sizeof buf.f_blocks == 4) {
	117	if ((st->f_blocks \| st->f_bfree \| st->f_bavail \|
	118	st->f_bsize \| st->f_frsize) &
7ed1ee61 AV	119	0xffffffff00000000ULL)
	120	return -EOVERFLOW;
	121	/*
	122	* f_files and f_ffree may be -1; it's okay to stuff
	123	* that into 32 bits
	124	*/
c8b91acc AV	125	if (st->f_files != -1 &&
c8b91acc AV	126	(st->f_files & 0xffffffff00000000ULL))
7ed1ee61	127	return -EOVERFLOW;
c8b91acc AV	128	if (st->f_ffree != -1 &&
c8b91acc AV	129	(st->f_ffree & 0xffffffff00000000ULL))
7ed1ee61 AV	130	return -EOVERFLOW;
	131	}
	132
c8b91acc AV	133	buf.f_type = st->f_type;
	134	buf.f_bsize = st->f_bsize;
	135	buf.f_blocks = st->f_blocks;
	136	buf.f_bfree = st->f_bfree;
	137	buf.f_bavail = st->f_bavail;
	138	buf.f_files = st->f_files;
	139	buf.f_ffree = st->f_ffree;
	140	buf.f_fsid = st->f_fsid;
	141	buf.f_namelen = st->f_namelen;
	142	buf.f_frsize = st->f_frsize;
	143	buf.f_flags = st->f_flags;
	144	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	145	}
c8b91acc AV	146	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	147	return -EFAULT;
7ed1ee61 AV	148	return 0;
	149	}
	150
c8b91acc	151	static int do_statfs64(struct kstatfs st, struct statfs64 __user p)
7ed1ee61	152	{
c8b91acc AV	153	struct statfs64 buf;
	154	if (sizeof(buf) == sizeof(*st))
	155	memcpy(&buf, st, sizeof(*st));
7ed1ee61	156	else {
c8b91acc AV	157	buf.f_type = st->f_type;
	158	buf.f_bsize = st->f_bsize;
	159	buf.f_blocks = st->f_blocks;
	160	buf.f_bfree = st->f_bfree;
	161	buf.f_bavail = st->f_bavail;
	162	buf.f_files = st->f_files;
	163	buf.f_ffree = st->f_ffree;
	164	buf.f_fsid = st->f_fsid;
	165	buf.f_namelen = st->f_namelen;
	166	buf.f_frsize = st->f_frsize;
	167	buf.f_flags = st->f_flags;
	168	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	169	}
c8b91acc AV	170	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	171	return -EFAULT;
7ed1ee61 AV	172	return 0;
	173	}
	174
	175	SYSCALL_DEFINE2(statfs, const char __user , pathname, struct statfs __user , buf)
	176	{
c8b91acc AV	177	struct kstatfs st;
	178	int error = user_statfs(pathname, &st);
	179	if (!error)
	180	error = do_statfs_native(&st, buf);
7ed1ee61 AV	181	return error;
	182	}
	183
	184	SYSCALL_DEFINE3(statfs64, const char __user , pathname, size_t, sz, struct statfs64 __user , buf)
	185	{
c8b91acc AV	186	struct kstatfs st;
c8b91acc AV	187	int error;
7ed1ee61 AV	188	if (sz != sizeof(*buf))
7ed1ee61 AV	189	return -EINVAL;
c8b91acc AV	190	error = user_statfs(pathname, &st);
	191	if (!error)
	192	error = do_statfs64(&st, buf);
7ed1ee61 AV	193	return error;
	194	}
	195
	196	SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
	197	{
c8b91acc AV	198	struct kstatfs st;
	199	int error = fd_statfs(fd, &st);
	200	if (!error)
	201	error = do_statfs_native(&st, buf);
7ed1ee61 AV	202	return error;
	203	}
	204
	205	SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
	206	{
c8b91acc	207	struct kstatfs st;
7ed1ee61 AV	208	int error;
	209
	210	if (sz != sizeof(*buf))
	211	return -EINVAL;
	212
c8b91acc AV	213	error = fd_statfs(fd, &st);
	214	if (!error)
	215	error = do_statfs64(&st, buf);
7ed1ee61 AV	216	return error;
	217	}
	218
cf31e70d	219	int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
7ed1ee61	220	{
cf31e70d	221	struct super_block *s = user_get_super(dev);
7ed1ee61	222	int err;
7ed1ee61 AV	223	if (!s)
	224	return -EINVAL;
	225
cf31e70d	226	err = statfs_by_dentry(s->s_root, sbuf);
7ed1ee61	227	drop_super(s);
cf31e70d AV	228	return err;
	229	}
	230
	231	SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
	232	{
	233	struct ustat tmp;
	234	struct kstatfs sbuf;
	235	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
7ed1ee61 AV	236	if (err)
	237	return err;
	238
	239	memset(&tmp,0,sizeof(struct ustat));
	240	tmp.f_tfree = sbuf.f_bfree;
	241	tmp.f_tinode = sbuf.f_ffree;
	242
	243	return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
	244	}
4ada54ee AV	245
	246	#ifdef CONFIG_COMPAT
	247	static int put_compat_statfs(struct compat_statfs __user ubuf, struct kstatfs kbuf)
	248	{
ae2a9762	249	struct compat_statfs buf;
4ada54ee AV	250	if (sizeof ubuf->f_blocks == 4) {
	251	if ((kbuf->f_blocks \| kbuf->f_bfree \| kbuf->f_bavail \|
	252	kbuf->f_bsize \| kbuf->f_frsize) & 0xffffffff00000000ULL)
	253	return -EOVERFLOW;
	254	/* f_files and f_ffree may be -1; it's okay
	255	* to stuff that into 32 bits */
	256	if (kbuf->f_files != 0xffffffffffffffffULL
	257	&& (kbuf->f_files & 0xffffffff00000000ULL))
	258	return -EOVERFLOW;
	259	if (kbuf->f_ffree != 0xffffffffffffffffULL
	260	&& (kbuf->f_ffree & 0xffffffff00000000ULL))
	261	return -EOVERFLOW;
	262	}
ae2a9762 AV	263	memset(&buf, 0, sizeof(struct compat_statfs));
	264	buf.f_type = kbuf->f_type;
	265	buf.f_bsize = kbuf->f_bsize;
	266	buf.f_blocks = kbuf->f_blocks;
	267	buf.f_bfree = kbuf->f_bfree;
	268	buf.f_bavail = kbuf->f_bavail;
	269	buf.f_files = kbuf->f_files;
	270	buf.f_ffree = kbuf->f_ffree;
	271	buf.f_namelen = kbuf->f_namelen;
	272	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	273	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	274	buf.f_frsize = kbuf->f_frsize;
	275	buf.f_flags = kbuf->f_flags;
	276	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs)))
4ada54ee AV	277	return -EFAULT;
	278	return 0;
	279	}
	280
	281	/*
	282	* The following statfs calls are copies of code from fs/statfs.c and
	283	* should be checked against those from time to time
	284	*/
	285	COMPAT_SYSCALL_DEFINE2(statfs, const char __user , pathname, struct compat_statfs __user , buf)
	286	{
	287	struct kstatfs tmp;
	288	int error = user_statfs(pathname, &tmp);
	289	if (!error)
	290	error = put_compat_statfs(buf, &tmp);
	291	return error;
	292	}
	293
	294	COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
	295	{
	296	struct kstatfs tmp;
	297	int error = fd_statfs(fd, &tmp);
	298	if (!error)
	299	error = put_compat_statfs(buf, &tmp);
	300	return error;
	301	}
	302
	303	static int put_compat_statfs64(struct compat_statfs64 __user ubuf, struct kstatfs kbuf)
	304	{
ae2a9762	305	struct compat_statfs64 buf;
4ada54ee AV	306	if (sizeof(ubuf->f_bsize) == 4) {
	307	if ((kbuf->f_type \| kbuf->f_bsize \| kbuf->f_namelen \|
	308	kbuf->f_frsize \| kbuf->f_flags) & 0xffffffff00000000ULL)
	309	return -EOVERFLOW;
	310	/* f_files and f_ffree may be -1; it's okay
	311	* to stuff that into 32 bits */
	312	if (kbuf->f_files != 0xffffffffffffffffULL
	313	&& (kbuf->f_files & 0xffffffff00000000ULL))
	314	return -EOVERFLOW;
	315	if (kbuf->f_ffree != 0xffffffffffffffffULL
	316	&& (kbuf->f_ffree & 0xffffffff00000000ULL))
	317	return -EOVERFLOW;
	318	}
ae2a9762 AV	319	memset(&buf, 0, sizeof(struct compat_statfs64));
	320	buf.f_type = kbuf->f_type;
	321	buf.f_bsize = kbuf->f_bsize;
	322	buf.f_blocks = kbuf->f_blocks;
	323	buf.f_bfree = kbuf->f_bfree;
	324	buf.f_bavail = kbuf->f_bavail;
	325	buf.f_files = kbuf->f_files;
	326	buf.f_ffree = kbuf->f_ffree;
	327	buf.f_namelen = kbuf->f_namelen;
	328	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	329	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	330	buf.f_frsize = kbuf->f_frsize;
	331	buf.f_flags = kbuf->f_flags;
	332	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs64)))
4ada54ee AV	333	return -EFAULT;
	334	return 0;
	335	}
	336
	337	COMPAT_SYSCALL_DEFINE3(statfs64, const char __user , pathname, compat_size_t, sz, struct compat_statfs64 __user , buf)
	338	{
	339	struct kstatfs tmp;
	340	int error;
	341
	342	if (sz != sizeof(*buf))
	343	return -EINVAL;
	344
	345	error = user_statfs(pathname, &tmp);
	346	if (!error)
	347	error = put_compat_statfs64(buf, &tmp);
	348	return error;
	349	}
	350
	351	COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
	352	{
	353	struct kstatfs tmp;
	354	int error;
	355
	356	if (sz != sizeof(*buf))
	357	return -EINVAL;
	358
	359	error = fd_statfs(fd, &tmp);
	360	if (!error)
	361	error = put_compat_statfs64(buf, &tmp);
	362	return error;
	363	}
	364
	365	/*
	366	* This is a copy of sys_ustat, just dealing with a structure layout.
	367	* Given how simple this syscall is that apporach is more maintainable
	368	* than the various conversion hacks.
	369	*/
	370	COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
	371	{
	372	struct compat_ustat tmp;
	373	struct kstatfs sbuf;
	374	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
	375	if (err)
	376	return err;
	377
	378	memset(&tmp, 0, sizeof(struct compat_ustat));
	379	tmp.f_tfree = sbuf.f_bfree;
	380	tmp.f_tinode = sbuf.f_ffree;
	381	if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
	382	return -EFAULT;
	383	return 0;
	384	}
	385	#endif