[people/ms/linux.git] / fs / statfs.c

// SPDX-License-Identifier: GPL-2.0
#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;
}

static 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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
7ed1ee61	2	#include <linux/syscalls.h>
630d9c47	3	#include <linux/export.h>
7ed1ee61 AV	4	#include <linux/fs.h>
7ed1ee61 AV	5	#include <linux/file.h>
365b1818	6	#include <linux/mount.h>
7ed1ee61 AV	7	#include <linux/namei.h>
	8	#include <linux/statfs.h>
	9	#include <linux/security.h>
	10	#include <linux/uaccess.h>
4ada54ee	11	#include <linux/compat.h>
cf31e70d	12	#include "internal.h"
7ed1ee61	13
365b1818 CH	14	static int flags_by_mnt(int mnt_flags)
	15	{
	16	int flags = 0;
	17
	18	if (mnt_flags & MNT_READONLY)
	19	flags \|= ST_RDONLY;
	20	if (mnt_flags & MNT_NOSUID)
	21	flags \|= ST_NOSUID;
	22	if (mnt_flags & MNT_NODEV)
	23	flags \|= ST_NODEV;
	24	if (mnt_flags & MNT_NOEXEC)
	25	flags \|= ST_NOEXEC;
	26	if (mnt_flags & MNT_NOATIME)
	27	flags \|= ST_NOATIME;
	28	if (mnt_flags & MNT_NODIRATIME)
	29	flags \|= ST_NODIRATIME;
	30	if (mnt_flags & MNT_RELATIME)
	31	flags \|= ST_RELATIME;
	32	return flags;
	33	}
	34
	35	static int flags_by_sb(int s_flags)
	36	{
	37	int flags = 0;
	38	if (s_flags & MS_SYNCHRONOUS)
	39	flags \|= ST_SYNCHRONOUS;
	40	if (s_flags & MS_MANDLOCK)
	41	flags \|= ST_MANDLOCK;
a8e2b636 CM	42	if (s_flags & MS_RDONLY)
a8e2b636 CM	43	flags \|= ST_RDONLY;
365b1818 CH	44	return flags;
	45	}
	46
	47	static int calculate_f_flags(struct vfsmount *mnt)
	48	{
	49	return ST_VALID \| flags_by_mnt(mnt->mnt_flags) \|
	50	flags_by_sb(mnt->mnt_sb->s_flags);
	51	}
	52
cf31e70d	53	static int statfs_by_dentry(struct dentry dentry, struct kstatfs buf)
7ed1ee61	54	{
ebabe9a9 CH	55	int retval;
	56
	57	if (!dentry->d_sb->s_op->statfs)
	58	return -ENOSYS;
	59
	60	memset(buf, 0, sizeof(*buf));
	61	retval = security_sb_statfs(dentry);
	62	if (retval)
	63	return retval;
	64	retval = dentry->d_sb->s_op->statfs(dentry, buf);
	65	if (retval == 0 && buf->f_frsize == 0)
	66	buf->f_frsize = buf->f_bsize;
7ed1ee61 AV	67	return retval;
	68	}
	69
f0bb5aaf	70	int vfs_statfs(const struct path path, struct kstatfs buf)
ebabe9a9	71	{
365b1818 CH	72	int error;
	73
	74	error = statfs_by_dentry(path->dentry, buf);
	75	if (!error)
	76	buf->f_flags = calculate_f_flags(path->mnt);
	77	return error;
ebabe9a9	78	}
7ed1ee61 AV	79	EXPORT_SYMBOL(vfs_statfs);
7ed1ee61 AV	80
c8b91acc	81	int user_statfs(const char __user pathname, struct kstatfs st)
7ed1ee61	82	{
c8b91acc	83	struct path path;
96948fc6 JL	84	int error;
	85	unsigned int lookup_flags = LOOKUP_FOLLOW\|LOOKUP_AUTOMOUNT;
	86	retry:
	87	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
c8b91acc AV	88	if (!error) {
	89	error = vfs_statfs(&path, st);
	90	path_put(&path);
96948fc6 JL	91	if (retry_estale(error, lookup_flags)) {
	92	lookup_flags \|= LOOKUP_REVAL;
	93	goto retry;
	94	}
c8b91acc AV	95	}
	96	return error;
	97	}
7ed1ee61	98
c8b91acc AV	99	int fd_statfs(int fd, struct kstatfs *st)
c8b91acc AV	100	{
9d05746e	101	struct fd f = fdget_raw(fd);
c8b91acc	102	int error = -EBADF;
2903ff01 AV	103	if (f.file) {
	104	error = vfs_statfs(&f.file->f_path, st);
	105	fdput(f);
c8b91acc AV	106	}
	107	return error;
	108	}
7ed1ee61	109
c8b91acc AV	110	static int do_statfs_native(struct kstatfs st, struct statfs __user p)
	111	{
	112	struct statfs buf;
	113
	114	if (sizeof(buf) == sizeof(*st))
	115	memcpy(&buf, st, sizeof(*st));
7ed1ee61	116	else {
c8b91acc AV	117	if (sizeof buf.f_blocks == 4) {
	118	if ((st->f_blocks \| st->f_bfree \| st->f_bavail \|
	119	st->f_bsize \| st->f_frsize) &
7ed1ee61 AV	120	0xffffffff00000000ULL)
	121	return -EOVERFLOW;
	122	/*
	123	* f_files and f_ffree may be -1; it's okay to stuff
	124	* that into 32 bits
	125	*/
c8b91acc AV	126	if (st->f_files != -1 &&
c8b91acc AV	127	(st->f_files & 0xffffffff00000000ULL))
7ed1ee61	128	return -EOVERFLOW;
c8b91acc AV	129	if (st->f_ffree != -1 &&
c8b91acc AV	130	(st->f_ffree & 0xffffffff00000000ULL))
7ed1ee61 AV	131	return -EOVERFLOW;
	132	}
	133
c8b91acc AV	134	buf.f_type = st->f_type;
	135	buf.f_bsize = st->f_bsize;
	136	buf.f_blocks = st->f_blocks;
	137	buf.f_bfree = st->f_bfree;
	138	buf.f_bavail = st->f_bavail;
	139	buf.f_files = st->f_files;
	140	buf.f_ffree = st->f_ffree;
	141	buf.f_fsid = st->f_fsid;
	142	buf.f_namelen = st->f_namelen;
	143	buf.f_frsize = st->f_frsize;
	144	buf.f_flags = st->f_flags;
	145	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	146	}
c8b91acc AV	147	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	148	return -EFAULT;
7ed1ee61 AV	149	return 0;
	150	}
	151
c8b91acc	152	static int do_statfs64(struct kstatfs st, struct statfs64 __user p)
7ed1ee61	153	{
c8b91acc AV	154	struct statfs64 buf;
	155	if (sizeof(buf) == sizeof(*st))
	156	memcpy(&buf, st, sizeof(*st));
7ed1ee61	157	else {
c8b91acc AV	158	buf.f_type = st->f_type;
	159	buf.f_bsize = st->f_bsize;
	160	buf.f_blocks = st->f_blocks;
	161	buf.f_bfree = st->f_bfree;
	162	buf.f_bavail = st->f_bavail;
	163	buf.f_files = st->f_files;
	164	buf.f_ffree = st->f_ffree;
	165	buf.f_fsid = st->f_fsid;
	166	buf.f_namelen = st->f_namelen;
	167	buf.f_frsize = st->f_frsize;
	168	buf.f_flags = st->f_flags;
	169	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	170	}
c8b91acc AV	171	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	172	return -EFAULT;
7ed1ee61 AV	173	return 0;
	174	}
	175
	176	SYSCALL_DEFINE2(statfs, const char __user , pathname, struct statfs __user , buf)
	177	{
c8b91acc AV	178	struct kstatfs st;
	179	int error = user_statfs(pathname, &st);
	180	if (!error)
	181	error = do_statfs_native(&st, buf);
7ed1ee61 AV	182	return error;
	183	}
	184
	185	SYSCALL_DEFINE3(statfs64, const char __user , pathname, size_t, sz, struct statfs64 __user , buf)
	186	{
c8b91acc AV	187	struct kstatfs st;
c8b91acc AV	188	int error;
7ed1ee61 AV	189	if (sz != sizeof(*buf))
7ed1ee61 AV	190	return -EINVAL;
c8b91acc AV	191	error = user_statfs(pathname, &st);
	192	if (!error)
	193	error = do_statfs64(&st, buf);
7ed1ee61 AV	194	return error;
	195	}
	196
	197	SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
	198	{
c8b91acc AV	199	struct kstatfs st;
	200	int error = fd_statfs(fd, &st);
	201	if (!error)
	202	error = do_statfs_native(&st, buf);
7ed1ee61 AV	203	return error;
	204	}
	205
	206	SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
	207	{
c8b91acc	208	struct kstatfs st;
7ed1ee61 AV	209	int error;
	210
	211	if (sz != sizeof(*buf))
	212	return -EINVAL;
	213
c8b91acc AV	214	error = fd_statfs(fd, &st);
	215	if (!error)
	216	error = do_statfs64(&st, buf);
7ed1ee61 AV	217	return error;
	218	}
	219
53fd88ab	220	static int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
7ed1ee61	221	{
cf31e70d	222	struct super_block *s = user_get_super(dev);
7ed1ee61	223	int err;
7ed1ee61 AV	224	if (!s)
	225	return -EINVAL;
	226
cf31e70d	227	err = statfs_by_dentry(s->s_root, sbuf);
7ed1ee61	228	drop_super(s);
cf31e70d AV	229	return err;
	230	}
	231
	232	SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
	233	{
	234	struct ustat tmp;
	235	struct kstatfs sbuf;
	236	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
7ed1ee61 AV	237	if (err)
	238	return err;
	239
	240	memset(&tmp,0,sizeof(struct ustat));
	241	tmp.f_tfree = sbuf.f_bfree;
	242	tmp.f_tinode = sbuf.f_ffree;
	243
	244	return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
	245	}
4ada54ee AV	246
	247	#ifdef CONFIG_COMPAT
	248	static int put_compat_statfs(struct compat_statfs __user ubuf, struct kstatfs kbuf)
	249	{
ae2a9762	250	struct compat_statfs buf;
4ada54ee AV	251	if (sizeof ubuf->f_blocks == 4) {
	252	if ((kbuf->f_blocks \| kbuf->f_bfree \| kbuf->f_bavail \|
	253	kbuf->f_bsize \| kbuf->f_frsize) & 0xffffffff00000000ULL)
	254	return -EOVERFLOW;
	255	/* f_files and f_ffree may be -1; it's okay
	256	* to stuff that into 32 bits */
	257	if (kbuf->f_files != 0xffffffffffffffffULL
	258	&& (kbuf->f_files & 0xffffffff00000000ULL))
	259	return -EOVERFLOW;
	260	if (kbuf->f_ffree != 0xffffffffffffffffULL
	261	&& (kbuf->f_ffree & 0xffffffff00000000ULL))
	262	return -EOVERFLOW;
	263	}
ae2a9762 AV	264	memset(&buf, 0, sizeof(struct compat_statfs));
	265	buf.f_type = kbuf->f_type;
	266	buf.f_bsize = kbuf->f_bsize;
	267	buf.f_blocks = kbuf->f_blocks;
	268	buf.f_bfree = kbuf->f_bfree;
	269	buf.f_bavail = kbuf->f_bavail;
	270	buf.f_files = kbuf->f_files;
	271	buf.f_ffree = kbuf->f_ffree;
	272	buf.f_namelen = kbuf->f_namelen;
	273	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	274	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	275	buf.f_frsize = kbuf->f_frsize;
	276	buf.f_flags = kbuf->f_flags;
	277	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs)))
4ada54ee AV	278	return -EFAULT;
	279	return 0;
	280	}
	281
	282	/*
	283	* The following statfs calls are copies of code from fs/statfs.c and
	284	* should be checked against those from time to time
	285	*/
	286	COMPAT_SYSCALL_DEFINE2(statfs, const char __user , pathname, struct compat_statfs __user , buf)
	287	{
	288	struct kstatfs tmp;
	289	int error = user_statfs(pathname, &tmp);
	290	if (!error)
	291	error = put_compat_statfs(buf, &tmp);
	292	return error;
	293	}
	294
	295	COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
	296	{
	297	struct kstatfs tmp;
	298	int error = fd_statfs(fd, &tmp);
	299	if (!error)
	300	error = put_compat_statfs(buf, &tmp);
	301	return error;
	302	}
	303
	304	static int put_compat_statfs64(struct compat_statfs64 __user ubuf, struct kstatfs kbuf)
	305	{
ae2a9762	306	struct compat_statfs64 buf;
4ada54ee AV	307	if (sizeof(ubuf->f_bsize) == 4) {
	308	if ((kbuf->f_type \| kbuf->f_bsize \| kbuf->f_namelen \|
	309	kbuf->f_frsize \| kbuf->f_flags) & 0xffffffff00000000ULL)
	310	return -EOVERFLOW;
	311	/* f_files and f_ffree may be -1; it's okay
	312	* to stuff that into 32 bits */
	313	if (kbuf->f_files != 0xffffffffffffffffULL
	314	&& (kbuf->f_files & 0xffffffff00000000ULL))
	315	return -EOVERFLOW;
	316	if (kbuf->f_ffree != 0xffffffffffffffffULL
	317	&& (kbuf->f_ffree & 0xffffffff00000000ULL))
	318	return -EOVERFLOW;
	319	}
ae2a9762 AV	320	memset(&buf, 0, sizeof(struct compat_statfs64));
	321	buf.f_type = kbuf->f_type;
	322	buf.f_bsize = kbuf->f_bsize;
	323	buf.f_blocks = kbuf->f_blocks;
	324	buf.f_bfree = kbuf->f_bfree;
	325	buf.f_bavail = kbuf->f_bavail;
	326	buf.f_files = kbuf->f_files;
	327	buf.f_ffree = kbuf->f_ffree;
	328	buf.f_namelen = kbuf->f_namelen;
	329	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	330	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	331	buf.f_frsize = kbuf->f_frsize;
	332	buf.f_flags = kbuf->f_flags;
	333	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs64)))
4ada54ee AV	334	return -EFAULT;
	335	return 0;
	336	}
	337
	338	COMPAT_SYSCALL_DEFINE3(statfs64, const char __user , pathname, compat_size_t, sz, struct compat_statfs64 __user , buf)
	339	{
	340	struct kstatfs tmp;
	341	int error;
	342
	343	if (sz != sizeof(*buf))
	344	return -EINVAL;
	345
	346	error = user_statfs(pathname, &tmp);
	347	if (!error)
	348	error = put_compat_statfs64(buf, &tmp);
	349	return error;
	350	}
	351
	352	COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
	353	{
	354	struct kstatfs tmp;
	355	int error;
	356
	357	if (sz != sizeof(*buf))
	358	return -EINVAL;
	359
	360	error = fd_statfs(fd, &tmp);
	361	if (!error)
	362	error = put_compat_statfs64(buf, &tmp);
	363	return error;
	364	}
	365
	366	/*
	367	* This is a copy of sys_ustat, just dealing with a structure layout.
	368	* Given how simple this syscall is that apporach is more maintainable
	369	* than the various conversion hacks.
	370	*/
	371	COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
	372	{
	373	struct compat_ustat tmp;
	374	struct kstatfs sbuf;
	375	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
	376	if (err)
	377	return err;
	378
	379	memset(&tmp, 0, sizeof(struct compat_ustat));
	380	tmp.f_tfree = sbuf.f_bfree;
	381	tmp.f_tinode = sbuf.f_ffree;
	382	if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
	383	return -EFAULT;
	384	return 0;
	385	}
	386	#endif