[linux-2.6-block.git] / fs / hostfs / hostfs_user.c

/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include <sys/syscall.h>
#include "hostfs.h"
#include <utime.h>

static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
{
	p->ino = buf->st_ino;
	p->mode = buf->st_mode;
	p->nlink = buf->st_nlink;
	p->uid = buf->st_uid;
	p->gid = buf->st_gid;
	p->size = buf->st_size;
	p->atime.tv_sec = buf->st_atime;
	p->atime.tv_nsec = 0;
	p->ctime.tv_sec = buf->st_ctime;
	p->ctime.tv_nsec = 0;
	p->mtime.tv_sec = buf->st_mtime;
	p->mtime.tv_nsec = 0;
	p->blksize = buf->st_blksize;
	p->blocks = buf->st_blocks;
	p->maj = os_major(buf->st_rdev);
	p->min = os_minor(buf->st_rdev);
}

int stat_file(const char *path, struct hostfs_stat *p, int fd)
{
	struct stat64 buf;

	if (fd >= 0) {
		if (fstat64(fd, &buf) < 0)
			return -errno;
	} else if (lstat64(path, &buf) < 0) {
		return -errno;
	}
	stat64_to_hostfs(&buf, p);
	return 0;
}

int access_file(char *path, int r, int w, int x)
{
	int mode = 0;

	if (r)
		mode = R_OK;
	if (w)
		mode |= W_OK;
	if (x)
		mode |= X_OK;
	if (access(path, mode) != 0)
		return -errno;
	else return 0;
}

int open_file(char *path, int r, int w, int append)
{
	int mode = 0, fd;

	if (r && !w)
		mode = O_RDONLY;
	else if (!r && w)
		mode = O_WRONLY;
	else if (r && w)
		mode = O_RDWR;
	else panic("Impossible mode in open_file");

	if (append)
		mode |= O_APPEND;
	fd = open64(path, mode);
	if (fd < 0)
		return -errno;
	else return fd;
}

void *open_dir(char *path, int *err_out)
{
	DIR *dir;

	dir = opendir(path);
	*err_out = errno;

	return dir;
}

char *read_dir(void *stream, unsigned long long *pos,
	       unsigned long long *ino_out, int *len_out,
	       unsigned int *type_out)
{
	DIR *dir = stream;
	struct dirent *ent;

	seekdir(dir, *pos);
	ent = readdir(dir);
	if (ent == NULL)
		return NULL;
	*len_out = strlen(ent->d_name);
	*ino_out = ent->d_ino;
	*type_out = ent->d_type;
	*pos = telldir(dir);
	return ent->d_name;
}

int read_file(int fd, unsigned long long *offset, char *buf, int len)
{
	int n;

	n = pread64(fd, buf, len, *offset);
	if (n < 0)
		return -errno;
	*offset += n;
	return n;
}

int write_file(int fd, unsigned long long *offset, const char *buf, int len)
{
	int n;

	n = pwrite64(fd, buf, len, *offset);
	if (n < 0)
		return -errno;
	*offset += n;
	return n;
}

int lseek_file(int fd, long long offset, int whence)
{
	int ret;

	ret = lseek64(fd, offset, whence);
	if (ret < 0)
		return -errno;
	return 0;
}

int fsync_file(int fd, int datasync)
{
	int ret;
	if (datasync)
		ret = fdatasync(fd);
	else
		ret = fsync(fd);

	if (ret < 0)
		return -errno;
	return 0;
}

int replace_file(int oldfd, int fd)
{
	return dup2(oldfd, fd);
}

void close_file(void *stream)
{
	close(*((int *) stream));
}

void close_dir(void *stream)
{
	closedir(stream);
}

int file_create(char *name, int ur, int uw, int ux, int gr,
		int gw, int gx, int or, int ow, int ox)
{
	int mode, fd;

	mode = 0;
	mode |= ur ? S_IRUSR : 0;
	mode |= uw ? S_IWUSR : 0;
	mode |= ux ? S_IXUSR : 0;
	mode |= gr ? S_IRGRP : 0;
	mode |= gw ? S_IWGRP : 0;
	mode |= gx ? S_IXGRP : 0;
	mode |= or ? S_IROTH : 0;
	mode |= ow ? S_IWOTH : 0;
	mode |= ox ? S_IXOTH : 0;
	fd = open64(name, O_CREAT | O_RDWR, mode);
	if (fd < 0)
		return -errno;
	return fd;
}

int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
{
	struct hostfs_stat st;
	struct timeval times[2];
	int err, ma;

	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
		if (fd >= 0) {
			if (fchmod(fd, attrs->ia_mode) != 0)
				return -errno;
		} else if (chmod(file, attrs->ia_mode) != 0) {
			return -errno;
		}
	}
	if (attrs->ia_valid & HOSTFS_ATTR_UID) {
		if (fd >= 0) {
			if (fchown(fd, attrs->ia_uid, -1))
				return -errno;
		} else if (chown(file, attrs->ia_uid, -1)) {
			return -errno;
		}
	}
	if (attrs->ia_valid & HOSTFS_ATTR_GID) {
		if (fd >= 0) {
			if (fchown(fd, -1, attrs->ia_gid))
				return -errno;
		} else if (chown(file, -1, attrs->ia_gid)) {
			return -errno;
		}
	}
	if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
		if (fd >= 0) {
			if (ftruncate(fd, attrs->ia_size))
				return -errno;
		} else if (truncate(file, attrs->ia_size)) {
			return -errno;
		}
	}

	/*
	 * Update accessed and/or modified time, in two parts: first set
	 * times according to the changes to perform, and then call futimes()
	 * or utimes() to apply them.
	 */
	ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
	if (attrs->ia_valid & ma) {
		err = stat_file(file, &st, fd);
		if (err != 0)
			return err;

		times[0].tv_sec = st.atime.tv_sec;
		times[0].tv_usec = st.atime.tv_nsec / 1000;
		times[1].tv_sec = st.mtime.tv_sec;
		times[1].tv_usec = st.mtime.tv_nsec / 1000;

		if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
			times[0].tv_sec = attrs->ia_atime.tv_sec;
			times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
		}
		if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
			times[1].tv_sec = attrs->ia_mtime.tv_sec;
			times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
		}

		if (fd >= 0) {
			if (futimes(fd, times) != 0)
				return -errno;
		} else if (utimes(file, times) != 0) {
			return -errno;
		}
	}

	/* Note: ctime is not handled */
	if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
		err = stat_file(file, &st, fd);
		attrs->ia_atime = st.atime;
		attrs->ia_mtime = st.mtime;
		if (err != 0)
			return err;
	}
	return 0;
}

int make_symlink(const char *from, const char *to)
{
	int err;

	err = symlink(to, from);
	if (err)
		return -errno;
	return 0;
}

int unlink_file(const char *file)
{
	int err;

	err = unlink(file);
	if (err)
		return -errno;
	return 0;
}

int do_mkdir(const char *file, int mode)
{
	int err;

	err = mkdir(file, mode);
	if (err)
		return -errno;
	return 0;
}

int do_rmdir(const char *file)
{
	int err;

	err = rmdir(file);
	if (err)
		return -errno;
	return 0;
}

int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
{
	int err;

	err = mknod(file, mode, os_makedev(major, minor));
	if (err)
		return -errno;
	return 0;
}

int link_file(const char *to, const char *from)
{
	int err;

	err = link(to, from);
	if (err)
		return -errno;
	return 0;
}

int hostfs_do_readlink(char *file, char *buf, int size)
{
	int n;

	n = readlink(file, buf, size);
	if (n < 0)
		return -errno;
	if (n < size)
		buf[n] = '\0';
	return n;
}

int rename_file(char *from, char *to)
{
	int err;

	err = rename(from, to);
	if (err < 0)
		return -errno;
	return 0;
}

int rename2_file(char *from, char *to, unsigned int flags)
{
	int err;

#ifndef SYS_renameat2
#  ifdef __x86_64__
#    define SYS_renameat2 316
#  endif
#  ifdef __i386__
#    define SYS_renameat2 353
#  endif
#endif

#ifdef SYS_renameat2
	err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
	if (err < 0) {
		if (errno != ENOSYS)
			return -errno;
		else
			return -EINVAL;
	}
	return 0;
#else
	return -EINVAL;
#endif
}

int do_statfs(char *root, long *bsize_out, long long *blocks_out,
	      long long *bfree_out, long long *bavail_out,
	      long long *files_out, long long *ffree_out,
	      void *fsid_out, int fsid_size, long *namelen_out)
{
	struct statfs64 buf;
	int err;

	err = statfs64(root, &buf);
	if (err < 0)
		return -errno;

	*bsize_out = buf.f_bsize;
	*blocks_out = buf.f_blocks;
	*bfree_out = buf.f_bfree;
	*bavail_out = buf.f_bavail;
	*files_out = buf.f_files;
	*ffree_out = buf.f_ffree;
	memcpy(fsid_out, &buf.f_fsid,
	       sizeof(buf.f_fsid) > fsid_size ? fsid_size :
	       sizeof(buf.f_fsid));
	*namelen_out = buf.f_namelen;

	return 0;
}
Commit	Line	Data
1da177e4	1	/*
f1adc05e	2	* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
1da177e4 LT	3	* Licensed under the GPL
	4	*/
	5
1da177e4	6	#include <stdio.h>
84b3db04 JD	7	#include <stddef.h>
84b3db04 JD	8	#include <unistd.h>
1da177e4 LT	9	#include <dirent.h>
1da177e4 LT	10	#include <errno.h>
84b3db04	11	#include <fcntl.h>
1da177e4 LT	12	#include <string.h>
	13	#include <sys/stat.h>
	14	#include <sys/time.h>
84b3db04	15	#include <sys/types.h>
1da177e4	16	#include <sys/vfs.h>
9a423bb6	17	#include <sys/syscall.h>
1da177e4	18	#include "hostfs.h"
84b3db04	19	#include <utime.h>
1da177e4	20
39b743c6 AV	21	static void stat64_to_hostfs(const struct stat64 buf, struct hostfs_stat p)
	22	{
	23	p->ino = buf->st_ino;
	24	p->mode = buf->st_mode;
	25	p->nlink = buf->st_nlink;
	26	p->uid = buf->st_uid;
	27	p->gid = buf->st_gid;
	28	p->size = buf->st_size;
	29	p->atime.tv_sec = buf->st_atime;
	30	p->atime.tv_nsec = 0;
	31	p->ctime.tv_sec = buf->st_ctime;
	32	p->ctime.tv_nsec = 0;
	33	p->mtime.tv_sec = buf->st_mtime;
	34	p->mtime.tv_nsec = 0;
	35	p->blksize = buf->st_blksize;
	36	p->blocks = buf->st_blocks;
	37	p->maj = os_major(buf->st_rdev);
	38	p->min = os_minor(buf->st_rdev);
	39	}
	40
	41	int stat_file(const char path, struct hostfs_stat p, int fd)
1da177e4 LT	42	{
	43	struct stat64 buf;
	44
84b3db04	45	if (fd >= 0) {
5822b7fa	46	if (fstat64(fd, &buf) < 0)
f1adc05e	47	return -errno;
84b3db04	48	} else if (lstat64(path, &buf) < 0) {
f1adc05e	49	return -errno;
5822b7fa	50	}
39b743c6	51	stat64_to_hostfs(&buf, p);
f1adc05e	52	return 0;
1da177e4 LT	53	}
1da177e4 LT	54
1da177e4 LT	55	int access_file(char *path, int r, int w, int x)
	56	{
	57	int mode = 0;
	58
84b3db04 JD	59	if (r)
	60	mode = R_OK;
	61	if (w)
	62	mode \|= W_OK;
	63	if (x)
	64	mode \|= X_OK;
	65	if (access(path, mode) != 0)
f1adc05e JD	66	return -errno;
f1adc05e JD	67	else return 0;
1da177e4 LT	68	}
	69
	70	int open_file(char *path, int r, int w, int append)
	71	{
	72	int mode = 0, fd;
	73
84b3db04	74	if (r && !w)
1da177e4	75	mode = O_RDONLY;
84b3db04	76	else if (!r && w)
1da177e4	77	mode = O_WRONLY;
84b3db04	78	else if (r && w)
1da177e4 LT	79	mode = O_RDWR;
	80	else panic("Impossible mode in open_file");
	81
84b3db04	82	if (append)
1da177e4 LT	83	mode \|= O_APPEND;
1da177e4 LT	84	fd = open64(path, mode);
84b3db04	85	if (fd < 0)
f1adc05e JD	86	return -errno;
f1adc05e JD	87	else return fd;
1da177e4 LT	88	}
	89
	90	void open_dir(char path, int *err_out)
	91	{
	92	DIR *dir;
	93
	94	dir = opendir(path);
	95	*err_out = errno;
c5c6dd4e	96
f1adc05e	97	return dir;
1da177e4 LT	98	}
	99
	100	char read_dir(void stream, unsigned long long *pos,
3ee6bd8e GU	101	unsigned long long ino_out, int len_out,
3ee6bd8e GU	102	unsigned int *type_out)
1da177e4 LT	103	{
	104	DIR *dir = stream;
	105	struct dirent *ent;
	106
	107	seekdir(dir, *pos);
	108	ent = readdir(dir);
84b3db04	109	if (ent == NULL)
f1adc05e	110	return NULL;
1da177e4 LT	111	*len_out = strlen(ent->d_name);
1da177e4 LT	112	*ino_out = ent->d_ino;
3ee6bd8e	113	*type_out = ent->d_type;
1da177e4	114	*pos = telldir(dir);
f1adc05e	115	return ent->d_name;
1da177e4 LT	116	}
	117
	118	int read_file(int fd, unsigned long long offset, char buf, int len)
	119	{
	120	int n;
	121
	122	n = pread64(fd, buf, len, *offset);
84b3db04	123	if (n < 0)
f1adc05e	124	return -errno;
1da177e4	125	*offset += n;
f1adc05e	126	return n;
1da177e4 LT	127	}
	128
	129	int write_file(int fd, unsigned long long offset, const char buf, int len)
	130	{
	131	int n;
	132
	133	n = pwrite64(fd, buf, len, *offset);
84b3db04	134	if (n < 0)
f1adc05e	135	return -errno;
1da177e4	136	*offset += n;
f1adc05e	137	return n;
1da177e4 LT	138	}
	139
	140	int lseek_file(int fd, long long offset, int whence)
	141	{
	142	int ret;
	143
	144	ret = lseek64(fd, offset, whence);
84b3db04	145	if (ret < 0)
f1adc05e JD	146	return -errno;
f1adc05e JD	147	return 0;
1da177e4 LT	148	}
1da177e4 LT	149
a2d76bd8 PBG	150	int fsync_file(int fd, int datasync)
	151	{
	152	int ret;
	153	if (datasync)
	154	ret = fdatasync(fd);
	155	else
	156	ret = fsync(fd);
	157
	158	if (ret < 0)
	159	return -errno;
	160	return 0;
	161	}
	162
f8ad850f AV	163	int replace_file(int oldfd, int fd)
	164	{
	165	return dup2(oldfd, fd);
	166	}
	167
1da177e4 LT	168	void close_file(void *stream)
	169	{
	170	close(((int ) stream));
	171	}
	172
	173	void close_dir(void *stream)
	174	{
	175	closedir(stream);
	176	}
	177
	178	int file_create(char *name, int ur, int uw, int ux, int gr,
	179	int gw, int gx, int or, int ow, int ox)
	180	{
	181	int mode, fd;
	182
	183	mode = 0;
	184	mode \|= ur ? S_IRUSR : 0;
	185	mode \|= uw ? S_IWUSR : 0;
	186	mode \|= ux ? S_IXUSR : 0;
	187	mode \|= gr ? S_IRGRP : 0;
	188	mode \|= gw ? S_IWGRP : 0;
	189	mode \|= gx ? S_IXGRP : 0;
	190	mode \|= or ? S_IROTH : 0;
	191	mode \|= ow ? S_IWOTH : 0;
	192	mode \|= ox ? S_IXOTH : 0;
	193	fd = open64(name, O_CREAT \| O_RDWR, mode);
84b3db04	194	if (fd < 0)
f1adc05e JD	195	return -errno;
f1adc05e JD	196	return fd;
1da177e4 LT	197	}
1da177e4 LT	198
5822b7fa	199	int set_attr(const char file, struct hostfs_iattr attrs, int fd)
1da177e4	200	{
39b743c6	201	struct hostfs_stat st;
5822b7fa	202	struct timeval times[2];
1da177e4 LT	203	int err, ma;
1da177e4 LT	204
5822b7fa AB	205	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
	206	if (fd >= 0) {
	207	if (fchmod(fd, attrs->ia_mode) != 0)
c5c6dd4e	208	return -errno;
5822b7fa	209	} else if (chmod(file, attrs->ia_mode) != 0) {
f1adc05e	210	return -errno;
5822b7fa	211	}
1da177e4	212	}
5822b7fa AB	213	if (attrs->ia_valid & HOSTFS_ATTR_UID) {
	214	if (fd >= 0) {
	215	if (fchown(fd, attrs->ia_uid, -1))
f1adc05e	216	return -errno;
84b3db04	217	} else if (chown(file, attrs->ia_uid, -1)) {
f1adc05e	218	return -errno;
5822b7fa	219	}
1da177e4	220	}
5822b7fa AB	221	if (attrs->ia_valid & HOSTFS_ATTR_GID) {
	222	if (fd >= 0) {
	223	if (fchown(fd, -1, attrs->ia_gid))
f1adc05e	224	return -errno;
5822b7fa	225	} else if (chown(file, -1, attrs->ia_gid)) {
f1adc05e	226	return -errno;
5822b7fa	227	}
1da177e4	228	}
5822b7fa AB	229	if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
	230	if (fd >= 0) {
	231	if (ftruncate(fd, attrs->ia_size))
f1adc05e	232	return -errno;
5822b7fa	233	} else if (truncate(file, attrs->ia_size)) {
f1adc05e	234	return -errno;
5822b7fa	235	}
1da177e4	236	}
5822b7fa	237
84b3db04 JD	238	/*
84b3db04 JD	239	* Update accessed and/or modified time, in two parts: first set
5822b7fa	240	* times according to the changes to perform, and then call futimes()
84b3db04 JD	241	* or utimes() to apply them.
84b3db04 JD	242	*/
5822b7fa AB	243	ma = (HOSTFS_ATTR_ATIME_SET \| HOSTFS_ATTR_MTIME_SET);
5822b7fa AB	244	if (attrs->ia_valid & ma) {
39b743c6	245	err = stat_file(file, &st, fd);
5822b7fa AB	246	if (err != 0)
	247	return err;
	248
39b743c6 AV	249	times[0].tv_sec = st.atime.tv_sec;
	250	times[0].tv_usec = st.atime.tv_nsec / 1000;
	251	times[1].tv_sec = st.mtime.tv_sec;
	252	times[1].tv_usec = st.mtime.tv_nsec / 1000;
5822b7fa AB	253
	254	if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
	255	times[0].tv_sec = attrs->ia_atime.tv_sec;
d7b88513	256	times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
1da177e4	257	}
5822b7fa AB	258	if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
5822b7fa AB	259	times[1].tv_sec = attrs->ia_mtime.tv_sec;
d7b88513	260	times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
5822b7fa AB	261	}
	262
	263	if (fd >= 0) {
	264	if (futimes(fd, times) != 0)
f1adc05e	265	return -errno;
5822b7fa	266	} else if (utimes(file, times) != 0) {
f1adc05e	267	return -errno;
1da177e4 LT	268	}
1da177e4 LT	269	}
5822b7fa	270
baabd156	271	/* Note: ctime is not handled */
84b3db04	272	if (attrs->ia_valid & (HOSTFS_ATTR_ATIME \| HOSTFS_ATTR_MTIME)) {
39b743c6 AV	273	err = stat_file(file, &st, fd);
	274	attrs->ia_atime = st.atime;
	275	attrs->ia_mtime = st.mtime;
84b3db04	276	if (err != 0)
f1adc05e	277	return err;
1da177e4	278	}
f1adc05e	279	return 0;
1da177e4 LT	280	}
	281
	282	int make_symlink(const char from, const char to)
	283	{
	284	int err;
	285
	286	err = symlink(to, from);
84b3db04	287	if (err)
f1adc05e JD	288	return -errno;
f1adc05e JD	289	return 0;
1da177e4 LT	290	}
	291
	292	int unlink_file(const char *file)
	293	{
	294	int err;
	295
	296	err = unlink(file);
84b3db04	297	if (err)
f1adc05e JD	298	return -errno;
f1adc05e JD	299	return 0;
1da177e4 LT	300	}
	301
	302	int do_mkdir(const char *file, int mode)
	303	{
	304	int err;
	305
	306	err = mkdir(file, mode);
84b3db04	307	if (err)
f1adc05e JD	308	return -errno;
f1adc05e JD	309	return 0;
1da177e4 LT	310	}
	311
	312	int do_rmdir(const char *file)
	313	{
	314	int err;
	315
	316	err = rmdir(file);
84b3db04	317	if (err)
f1adc05e JD	318	return -errno;
f1adc05e JD	319	return 0;
1da177e4 LT	320	}
1da177e4 LT	321
88f6cd0c	322	int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
1da177e4 LT	323	{
	324	int err;
	325
005a59ec	326	err = mknod(file, mode, os_makedev(major, minor));
84b3db04	327	if (err)
f1adc05e JD	328	return -errno;
f1adc05e JD	329	return 0;
1da177e4 LT	330	}
	331
	332	int link_file(const char to, const char from)
	333	{
	334	int err;
	335
	336	err = link(to, from);
84b3db04	337	if (err)
f1adc05e JD	338	return -errno;
f1adc05e JD	339	return 0;
1da177e4 LT	340	}
1da177e4 LT	341
ea7e743e	342	int hostfs_do_readlink(char file, char buf, int size)
1da177e4 LT	343	{
	344	int n;
	345
	346	n = readlink(file, buf, size);
84b3db04	347	if (n < 0)
f1adc05e	348	return -errno;
84b3db04	349	if (n < size)
1da177e4	350	buf[n] = '\0';
f1adc05e	351	return n;
1da177e4 LT	352	}
	353
	354	int rename_file(char from, char to)
	355	{
	356	int err;
	357
	358	err = rename(from, to);
84b3db04	359	if (err < 0)
f1adc05e JD	360	return -errno;
f1adc05e JD	361	return 0;
1da177e4 LT	362	}
1da177e4 LT	363
9a423bb6 MS	364	int rename2_file(char from, char to, unsigned int flags)
	365	{
	366	int err;
	367
	368	#ifndef SYS_renameat2
	369	# ifdef __x86_64__
	370	# define SYS_renameat2 316
	371	# endif
	372	# ifdef __i386__
	373	# define SYS_renameat2 353
	374	# endif
	375	#endif
	376
	377	#ifdef SYS_renameat2
	378	err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
	379	if (err < 0) {
	380	if (errno != ENOSYS)
	381	return -errno;
	382	else
	383	return -EINVAL;
	384	}
	385	return 0;
	386	#else
	387	return -EINVAL;
	388	#endif
	389	}
	390
1da177e4 LT	391	int do_statfs(char root, long bsize_out, long long *blocks_out,
	392	long long bfree_out, long long bavail_out,
	393	long long files_out, long long ffree_out,
1b627d57	394	void fsid_out, int fsid_size, long namelen_out)
1da177e4 LT	395	{
	396	struct statfs64 buf;
	397	int err;
	398
	399	err = statfs64(root, &buf);
84b3db04	400	if (err < 0)
f1adc05e JD	401	return -errno;
f1adc05e JD	402
1da177e4 LT	403	*bsize_out = buf.f_bsize;
	404	*blocks_out = buf.f_blocks;
	405	*bfree_out = buf.f_bfree;
	406	*bavail_out = buf.f_bavail;
	407	*files_out = buf.f_files;
	408	*ffree_out = buf.f_ffree;
	409	memcpy(fsid_out, &buf.f_fsid,
	410	sizeof(buf.f_fsid) > fsid_size ? fsid_size :
	411	sizeof(buf.f_fsid));
	412	*namelen_out = buf.f_namelen;
1b627d57	413
f1adc05e	414	return 0;
1da177e4	415	}