[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 & SB_SYNCHRONOUS)
		flags |= ST_SYNCHRONOUS;
	if (s_flags & SB_MANDLOCK)
		flags |= ST_MANDLOCK;
	if (s_flags & SB_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_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid)
{
	struct kstatfs st;
	int error;

	error = statfs_by_dentry(dentry, &st);
	if (error)
		return error;

	*fsid = st.f_fsid;
	return 0;
}
EXPORT_SYMBOL(vfs_get_fsid);

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 ((kbuf->f_bsize | kbuf->f_frsize) & 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;
}

int kcompat_sys_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(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
{
	return kcompat_sys_statfs64(pathname, sz, buf);
}

int kcompat_sys_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;
}

COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
{
	return kcompat_sys_fstatfs64(fd, sz, buf);
}

/*
 * 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;
1751e8a6	38	if (s_flags & SB_SYNCHRONOUS)
365b1818	39	flags \|= ST_SYNCHRONOUS;
1751e8a6	40	if (s_flags & SB_MANDLOCK)
365b1818	41	flags \|= ST_MANDLOCK;
1751e8a6	42	if (s_flags & SB_RDONLY)
a8e2b636	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
ec86ff56 AG	70	int vfs_get_fsid(struct dentry dentry, __kernel_fsid_t fsid)
	71	{
	72	struct kstatfs st;
	73	int error;
	74
	75	error = statfs_by_dentry(dentry, &st);
	76	if (error)
	77	return error;
	78
	79	*fsid = st.f_fsid;
	80	return 0;
	81	}
	82	EXPORT_SYMBOL(vfs_get_fsid);
	83
f0bb5aaf	84	int vfs_statfs(const struct path path, struct kstatfs buf)
ebabe9a9	85	{
365b1818 CH	86	int error;
	87
	88	error = statfs_by_dentry(path->dentry, buf);
	89	if (!error)
	90	buf->f_flags = calculate_f_flags(path->mnt);
	91	return error;
ebabe9a9	92	}
7ed1ee61 AV	93	EXPORT_SYMBOL(vfs_statfs);
7ed1ee61 AV	94
c8b91acc	95	int user_statfs(const char __user pathname, struct kstatfs st)
7ed1ee61	96	{
c8b91acc	97	struct path path;
96948fc6 JL	98	int error;
	99	unsigned int lookup_flags = LOOKUP_FOLLOW\|LOOKUP_AUTOMOUNT;
	100	retry:
	101	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
c8b91acc AV	102	if (!error) {
	103	error = vfs_statfs(&path, st);
	104	path_put(&path);
96948fc6 JL	105	if (retry_estale(error, lookup_flags)) {
	106	lookup_flags \|= LOOKUP_REVAL;
	107	goto retry;
	108	}
c8b91acc AV	109	}
	110	return error;
	111	}
7ed1ee61	112
c8b91acc AV	113	int fd_statfs(int fd, struct kstatfs *st)
c8b91acc AV	114	{
9d05746e	115	struct fd f = fdget_raw(fd);
c8b91acc	116	int error = -EBADF;
2903ff01 AV	117	if (f.file) {
	118	error = vfs_statfs(&f.file->f_path, st);
	119	fdput(f);
c8b91acc AV	120	}
	121	return error;
	122	}
7ed1ee61	123
c8b91acc AV	124	static int do_statfs_native(struct kstatfs st, struct statfs __user p)
	125	{
	126	struct statfs buf;
	127
	128	if (sizeof(buf) == sizeof(*st))
	129	memcpy(&buf, st, sizeof(*st));
7ed1ee61	130	else {
c8b91acc AV	131	if (sizeof buf.f_blocks == 4) {
	132	if ((st->f_blocks \| st->f_bfree \| st->f_bavail \|
	133	st->f_bsize \| st->f_frsize) &
7ed1ee61 AV	134	0xffffffff00000000ULL)
	135	return -EOVERFLOW;
	136	/*
	137	* f_files and f_ffree may be -1; it's okay to stuff
	138	* that into 32 bits
	139	*/
c8b91acc AV	140	if (st->f_files != -1 &&
c8b91acc AV	141	(st->f_files & 0xffffffff00000000ULL))
7ed1ee61	142	return -EOVERFLOW;
c8b91acc AV	143	if (st->f_ffree != -1 &&
c8b91acc AV	144	(st->f_ffree & 0xffffffff00000000ULL))
7ed1ee61 AV	145	return -EOVERFLOW;
	146	}
	147
c8b91acc AV	148	buf.f_type = st->f_type;
	149	buf.f_bsize = st->f_bsize;
	150	buf.f_blocks = st->f_blocks;
	151	buf.f_bfree = st->f_bfree;
	152	buf.f_bavail = st->f_bavail;
	153	buf.f_files = st->f_files;
	154	buf.f_ffree = st->f_ffree;
	155	buf.f_fsid = st->f_fsid;
	156	buf.f_namelen = st->f_namelen;
	157	buf.f_frsize = st->f_frsize;
	158	buf.f_flags = st->f_flags;
	159	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	160	}
c8b91acc AV	161	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	162	return -EFAULT;
7ed1ee61 AV	163	return 0;
	164	}
	165
c8b91acc	166	static int do_statfs64(struct kstatfs st, struct statfs64 __user p)
7ed1ee61	167	{
c8b91acc AV	168	struct statfs64 buf;
	169	if (sizeof(buf) == sizeof(*st))
	170	memcpy(&buf, st, sizeof(*st));
7ed1ee61	171	else {
c8b91acc AV	172	buf.f_type = st->f_type;
	173	buf.f_bsize = st->f_bsize;
	174	buf.f_blocks = st->f_blocks;
	175	buf.f_bfree = st->f_bfree;
	176	buf.f_bavail = st->f_bavail;
	177	buf.f_files = st->f_files;
	178	buf.f_ffree = st->f_ffree;
	179	buf.f_fsid = st->f_fsid;
	180	buf.f_namelen = st->f_namelen;
	181	buf.f_frsize = st->f_frsize;
	182	buf.f_flags = st->f_flags;
	183	memset(buf.f_spare, 0, sizeof(buf.f_spare));
7ed1ee61	184	}
c8b91acc AV	185	if (copy_to_user(p, &buf, sizeof(buf)))
c8b91acc AV	186	return -EFAULT;
7ed1ee61 AV	187	return 0;
	188	}
	189
	190	SYSCALL_DEFINE2(statfs, const char __user , pathname, struct statfs __user , buf)
	191	{
c8b91acc AV	192	struct kstatfs st;
	193	int error = user_statfs(pathname, &st);
	194	if (!error)
	195	error = do_statfs_native(&st, buf);
7ed1ee61 AV	196	return error;
	197	}
	198
	199	SYSCALL_DEFINE3(statfs64, const char __user , pathname, size_t, sz, struct statfs64 __user , buf)
	200	{
c8b91acc AV	201	struct kstatfs st;
c8b91acc AV	202	int error;
7ed1ee61 AV	203	if (sz != sizeof(*buf))
7ed1ee61 AV	204	return -EINVAL;
c8b91acc AV	205	error = user_statfs(pathname, &st);
	206	if (!error)
	207	error = do_statfs64(&st, buf);
7ed1ee61 AV	208	return error;
	209	}
	210
	211	SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
	212	{
c8b91acc AV	213	struct kstatfs st;
	214	int error = fd_statfs(fd, &st);
	215	if (!error)
	216	error = do_statfs_native(&st, buf);
7ed1ee61 AV	217	return error;
	218	}
	219
	220	SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
	221	{
c8b91acc	222	struct kstatfs st;
7ed1ee61 AV	223	int error;
	224
	225	if (sz != sizeof(*buf))
	226	return -EINVAL;
	227
c8b91acc AV	228	error = fd_statfs(fd, &st);
	229	if (!error)
	230	error = do_statfs64(&st, buf);
7ed1ee61 AV	231	return error;
	232	}
	233
53fd88ab	234	static int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
7ed1ee61	235	{
cf31e70d	236	struct super_block *s = user_get_super(dev);
7ed1ee61	237	int err;
7ed1ee61 AV	238	if (!s)
	239	return -EINVAL;
	240
cf31e70d	241	err = statfs_by_dentry(s->s_root, sbuf);
7ed1ee61	242	drop_super(s);
cf31e70d AV	243	return err;
	244	}
	245
	246	SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
	247	{
	248	struct ustat tmp;
	249	struct kstatfs sbuf;
	250	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
7ed1ee61 AV	251	if (err)
	252	return err;
	253
	254	memset(&tmp,0,sizeof(struct ustat));
	255	tmp.f_tfree = sbuf.f_bfree;
	256	tmp.f_tinode = sbuf.f_ffree;
	257
	258	return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
	259	}
4ada54ee AV	260
	261	#ifdef CONFIG_COMPAT
	262	static int put_compat_statfs(struct compat_statfs __user ubuf, struct kstatfs kbuf)
	263	{
ae2a9762	264	struct compat_statfs buf;
4ada54ee AV	265	if (sizeof ubuf->f_blocks == 4) {
	266	if ((kbuf->f_blocks \| kbuf->f_bfree \| kbuf->f_bavail \|
	267	kbuf->f_bsize \| kbuf->f_frsize) & 0xffffffff00000000ULL)
	268	return -EOVERFLOW;
	269	/* f_files and f_ffree may be -1; it's okay
	270	* to stuff that into 32 bits */
	271	if (kbuf->f_files != 0xffffffffffffffffULL
	272	&& (kbuf->f_files & 0xffffffff00000000ULL))
	273	return -EOVERFLOW;
	274	if (kbuf->f_ffree != 0xffffffffffffffffULL
	275	&& (kbuf->f_ffree & 0xffffffff00000000ULL))
	276	return -EOVERFLOW;
	277	}
ae2a9762 AV	278	memset(&buf, 0, sizeof(struct compat_statfs));
	279	buf.f_type = kbuf->f_type;
	280	buf.f_bsize = kbuf->f_bsize;
	281	buf.f_blocks = kbuf->f_blocks;
	282	buf.f_bfree = kbuf->f_bfree;
	283	buf.f_bavail = kbuf->f_bavail;
	284	buf.f_files = kbuf->f_files;
	285	buf.f_ffree = kbuf->f_ffree;
	286	buf.f_namelen = kbuf->f_namelen;
	287	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	288	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	289	buf.f_frsize = kbuf->f_frsize;
	290	buf.f_flags = kbuf->f_flags;
	291	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs)))
4ada54ee AV	292	return -EFAULT;
	293	return 0;
	294	}
	295
	296	/*
	297	* The following statfs calls are copies of code from fs/statfs.c and
	298	* should be checked against those from time to time
	299	*/
	300	COMPAT_SYSCALL_DEFINE2(statfs, const char __user , pathname, struct compat_statfs __user , buf)
	301	{
	302	struct kstatfs tmp;
	303	int error = user_statfs(pathname, &tmp);
	304	if (!error)
	305	error = put_compat_statfs(buf, &tmp);
	306	return error;
	307	}
	308
	309	COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
	310	{
	311	struct kstatfs tmp;
	312	int error = fd_statfs(fd, &tmp);
	313	if (!error)
	314	error = put_compat_statfs(buf, &tmp);
	315	return error;
	316	}
	317
	318	static int put_compat_statfs64(struct compat_statfs64 __user ubuf, struct kstatfs kbuf)
	319	{
ae2a9762	320	struct compat_statfs64 buf;
cc3a7bfe ES	321
	322	if ((kbuf->f_bsize \| kbuf->f_frsize) & 0xffffffff00000000ULL)
	323	return -EOVERFLOW;
	324
ae2a9762 AV	325	memset(&buf, 0, sizeof(struct compat_statfs64));
	326	buf.f_type = kbuf->f_type;
	327	buf.f_bsize = kbuf->f_bsize;
	328	buf.f_blocks = kbuf->f_blocks;
	329	buf.f_bfree = kbuf->f_bfree;
	330	buf.f_bavail = kbuf->f_bavail;
	331	buf.f_files = kbuf->f_files;
	332	buf.f_ffree = kbuf->f_ffree;
	333	buf.f_namelen = kbuf->f_namelen;
	334	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
	335	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
	336	buf.f_frsize = kbuf->f_frsize;
	337	buf.f_flags = kbuf->f_flags;
	338	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs64)))
4ada54ee AV	339	return -EFAULT;
	340	return 0;
	341	}
	342
9b54bf9d	343	int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz, struct compat_statfs64 __user * buf)
4ada54ee AV	344	{
	345	struct kstatfs tmp;
	346	int error;
	347
	348	if (sz != sizeof(*buf))
	349	return -EINVAL;
	350
	351	error = user_statfs(pathname, &tmp);
	352	if (!error)
	353	error = put_compat_statfs64(buf, &tmp);
	354	return error;
	355	}
	356
9b54bf9d MR	357	COMPAT_SYSCALL_DEFINE3(statfs64, const char __user , pathname, compat_size_t, sz, struct compat_statfs64 __user , buf)
	358	{
	359	return kcompat_sys_statfs64(pathname, sz, buf);
	360	}
	361
	362	int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user * buf)
4ada54ee AV	363	{
	364	struct kstatfs tmp;
	365	int error;
	366
	367	if (sz != sizeof(*buf))
	368	return -EINVAL;
	369
	370	error = fd_statfs(fd, &tmp);
	371	if (!error)
	372	error = put_compat_statfs64(buf, &tmp);
	373	return error;
	374	}
	375
9b54bf9d MR	376	COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
	377	{
	378	return kcompat_sys_fstatfs64(fd, sz, buf);
	379	}
	380
4ada54ee AV	381	/*
	382	* This is a copy of sys_ustat, just dealing with a structure layout.
	383	* Given how simple this syscall is that apporach is more maintainable
	384	* than the various conversion hacks.
	385	*/
	386	COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
	387	{
	388	struct compat_ustat tmp;
	389	struct kstatfs sbuf;
	390	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
	391	if (err)
	392	return err;
	393
	394	memset(&tmp, 0, sizeof(struct compat_ustat));
	395	tmp.f_tfree = sbuf.f_bfree;
	396	tmp.f_tinode = sbuf.f_ffree;
	397	if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
	398	return -EFAULT;
	399	return 0;
	400	}
	401	#endif