[net-next-2.6.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 "hostfs.h"
#include "os.h"
#include "user.h"
#include <utime.h>

int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
	      int *nlink_out, int *uid_out, int *gid_out,
	      unsigned long long *size_out, struct timespec *atime_out,
	      struct timespec *mtime_out, struct timespec *ctime_out,
	      int *blksize_out, unsigned long long *blocks_out, int fd)
{
	struct stat64 buf;

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

	if (inode_out != NULL)
		*inode_out = buf.st_ino;
	if (mode_out != NULL)
		*mode_out = buf.st_mode;
	if (nlink_out != NULL)
		*nlink_out = buf.st_nlink;
	if (uid_out != NULL)
		*uid_out = buf.st_uid;
	if (gid_out != NULL)
		*gid_out = buf.st_gid;
	if (size_out != NULL)
		*size_out = buf.st_size;
	if (atime_out != NULL) {
		atime_out->tv_sec = buf.st_atime;
		atime_out->tv_nsec = 0;
	}
	if (mtime_out != NULL) {
		mtime_out->tv_sec = buf.st_mtime;
		mtime_out->tv_nsec = 0;
	}
	if (ctime_out != NULL) {
		ctime_out->tv_sec = buf.st_ctime;
		ctime_out->tv_nsec = 0;
	}
	if (blksize_out != NULL)
		*blksize_out = buf.st_blksize;
	if (blocks_out != NULL)
		*blocks_out = buf.st_blocks;
	return 0;
}

int file_type(const char *path, int *maj, int *min)
{
 	struct stat64 buf;

	if (lstat64(path, &buf) < 0)
		return -errno;
	/*
	 * We cannot pass rdev as is because glibc and the kernel disagree
	 * about its definition.
	 */
	if (maj != NULL)
		*maj = major(buf.st_rdev);
	if (min != NULL)
		*min = minor(buf.st_rdev);

	if (S_ISDIR(buf.st_mode))
		return OS_TYPE_DIR;
	else if (S_ISLNK(buf.st_mode))
		return OS_TYPE_SYMLINK;
	else if (S_ISCHR(buf.st_mode))
		return OS_TYPE_CHARDEV;
	else if (S_ISBLK(buf.st_mode))
		return OS_TYPE_BLOCKDEV;
	else if (S_ISFIFO(buf.st_mode))
		return OS_TYPE_FIFO;
	else if (S_ISSOCK(buf.st_mode))
		return OS_TYPE_SOCK;
	else return OS_TYPE_FILE;
}

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;
	if (dir == NULL)
		return NULL;
	return dir;
}

char *read_dir(void *stream, unsigned long long *pos,
	       unsigned long long *ino_out, int *len_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;
	*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;
}

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 timeval times[2];
	struct timespec atime_ts, mtime_ts;
	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, NULL, NULL, NULL, NULL, NULL, NULL,
				&atime_ts, &mtime_ts, NULL, NULL, NULL, fd);
		if (err != 0)
			return err;

		times[0].tv_sec = atime_ts.tv_sec;
		times[0].tv_usec = atime_ts.tv_nsec / 1000;
		times[1].tv_sec = mtime_ts.tv_sec;
		times[1].tv_usec = mtime_ts.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, NULL, NULL, NULL, NULL, NULL, NULL,
				&attrs->ia_atime, &attrs->ia_mtime, NULL,
				NULL, NULL, fd);
		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, 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 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 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,
	      long *spare_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;
	spare_out[0] = buf.f_spare[0];
	spare_out[1] = buf.f_spare[1];
	spare_out[2] = buf.f_spare[2];
	spare_out[3] = buf.f_spare[3];
	spare_out[4] = buf.f_spare[4];
	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 LT	16	#include <sys/vfs.h>
1da177e4 LT	17	#include "hostfs.h"
84b3db04	18	#include "os.h"
1da177e4	19	#include "user.h"
84b3db04	20	#include <utime.h>
1da177e4 LT	21
	22	int stat_file(const char path, unsigned long long inode_out, int *mode_out,
	23	int nlink_out, int uid_out, int *gid_out,
	24	unsigned long long size_out, struct timespec atime_out,
	25	struct timespec mtime_out, struct timespec ctime_out,
5822b7fa	26	int blksize_out, unsigned long long blocks_out, int fd)
1da177e4 LT	27	{
	28	struct stat64 buf;
	29
84b3db04	30	if (fd >= 0) {
5822b7fa	31	if (fstat64(fd, &buf) < 0)
f1adc05e	32	return -errno;
84b3db04	33	} else if (lstat64(path, &buf) < 0) {
f1adc05e	34	return -errno;
5822b7fa	35	}
1da177e4	36
84b3db04 JD	37	if (inode_out != NULL)
	38	*inode_out = buf.st_ino;
	39	if (mode_out != NULL)
	40	*mode_out = buf.st_mode;
	41	if (nlink_out != NULL)
	42	*nlink_out = buf.st_nlink;
	43	if (uid_out != NULL)
	44	*uid_out = buf.st_uid;
	45	if (gid_out != NULL)
	46	*gid_out = buf.st_gid;
	47	if (size_out != NULL)
	48	*size_out = buf.st_size;
	49	if (atime_out != NULL) {
1da177e4 LT	50	atime_out->tv_sec = buf.st_atime;
	51	atime_out->tv_nsec = 0;
	52	}
84b3db04	53	if (mtime_out != NULL) {
1da177e4 LT	54	mtime_out->tv_sec = buf.st_mtime;
	55	mtime_out->tv_nsec = 0;
	56	}
84b3db04	57	if (ctime_out != NULL) {
1da177e4 LT	58	ctime_out->tv_sec = buf.st_ctime;
	59	ctime_out->tv_nsec = 0;
	60	}
84b3db04 JD	61	if (blksize_out != NULL)
	62	*blksize_out = buf.st_blksize;
	63	if (blocks_out != NULL)
	64	*blocks_out = buf.st_blocks;
f1adc05e	65	return 0;
1da177e4 LT	66	}
	67
	68	int file_type(const char path, int maj, int *min)
	69	{
	70	struct stat64 buf;
	71
84b3db04	72	if (lstat64(path, &buf) < 0)
f1adc05e	73	return -errno;
84b3db04 JD	74	/*
	75	* We cannot pass rdev as is because glibc and the kernel disagree
	76	* about its definition.
	77	*/
	78	if (maj != NULL)
1da177e4	79	*maj = major(buf.st_rdev);
84b3db04	80	if (min != NULL)
1da177e4 LT	81	*min = minor(buf.st_rdev);
1da177e4 LT	82
84b3db04 JD	83	if (S_ISDIR(buf.st_mode))
	84	return OS_TYPE_DIR;
	85	else if (S_ISLNK(buf.st_mode))
	86	return OS_TYPE_SYMLINK;
	87	else if (S_ISCHR(buf.st_mode))
	88	return OS_TYPE_CHARDEV;
	89	else if (S_ISBLK(buf.st_mode))
	90	return OS_TYPE_BLOCKDEV;
	91	else if (S_ISFIFO(buf.st_mode))
	92	return OS_TYPE_FIFO;
	93	else if (S_ISSOCK(buf.st_mode))
	94	return OS_TYPE_SOCK;
f1adc05e	95	else return OS_TYPE_FILE;
1da177e4 LT	96	}
	97
	98	int access_file(char *path, int r, int w, int x)
	99	{
	100	int mode = 0;
	101
84b3db04 JD	102	if (r)
	103	mode = R_OK;
	104	if (w)
	105	mode \|= W_OK;
	106	if (x)
	107	mode \|= X_OK;
	108	if (access(path, mode) != 0)
f1adc05e JD	109	return -errno;
f1adc05e JD	110	else return 0;
1da177e4 LT	111	}
	112
	113	int open_file(char *path, int r, int w, int append)
	114	{
	115	int mode = 0, fd;
	116
84b3db04	117	if (r && !w)
1da177e4	118	mode = O_RDONLY;
84b3db04	119	else if (!r && w)
1da177e4	120	mode = O_WRONLY;
84b3db04	121	else if (r && w)
1da177e4 LT	122	mode = O_RDWR;
	123	else panic("Impossible mode in open_file");
	124
84b3db04	125	if (append)
1da177e4 LT	126	mode \|= O_APPEND;
1da177e4 LT	127	fd = open64(path, mode);
84b3db04	128	if (fd < 0)
f1adc05e JD	129	return -errno;
f1adc05e JD	130	else return fd;
1da177e4 LT	131	}
	132
	133	void open_dir(char path, int *err_out)
	134	{
	135	DIR *dir;
	136
	137	dir = opendir(path);
	138	*err_out = errno;
84b3db04	139	if (dir == NULL)
f1adc05e JD	140	return NULL;
f1adc05e JD	141	return dir;
1da177e4 LT	142	}
	143
	144	char read_dir(void stream, unsigned long long *pos,
	145	unsigned long long ino_out, int len_out)
	146	{
	147	DIR *dir = stream;
	148	struct dirent *ent;
	149
	150	seekdir(dir, *pos);
	151	ent = readdir(dir);
84b3db04	152	if (ent == NULL)
f1adc05e	153	return NULL;
1da177e4 LT	154	*len_out = strlen(ent->d_name);
	155	*ino_out = ent->d_ino;
	156	*pos = telldir(dir);
f1adc05e	157	return ent->d_name;
1da177e4 LT	158	}
	159
	160	int read_file(int fd, unsigned long long offset, char buf, int len)
	161	{
	162	int n;
	163
	164	n = pread64(fd, buf, len, *offset);
84b3db04	165	if (n < 0)
f1adc05e	166	return -errno;
1da177e4	167	*offset += n;
f1adc05e	168	return n;
1da177e4 LT	169	}
	170
	171	int write_file(int fd, unsigned long long offset, const char buf, int len)
	172	{
	173	int n;
	174
	175	n = pwrite64(fd, buf, len, *offset);
84b3db04	176	if (n < 0)
f1adc05e	177	return -errno;
1da177e4	178	*offset += n;
f1adc05e	179	return n;
1da177e4 LT	180	}
	181
	182	int lseek_file(int fd, long long offset, int whence)
	183	{
	184	int ret;
	185
	186	ret = lseek64(fd, offset, whence);
84b3db04	187	if (ret < 0)
f1adc05e JD	188	return -errno;
f1adc05e JD	189	return 0;
1da177e4 LT	190	}
1da177e4 LT	191
a2d76bd8 PBG	192	int fsync_file(int fd, int datasync)
	193	{
	194	int ret;
	195	if (datasync)
	196	ret = fdatasync(fd);
	197	else
	198	ret = fsync(fd);
	199
	200	if (ret < 0)
	201	return -errno;
	202	return 0;
	203	}
	204
1da177e4 LT	205	void close_file(void *stream)
	206	{
	207	close(((int ) stream));
	208	}
	209
	210	void close_dir(void *stream)
	211	{
	212	closedir(stream);
	213	}
	214
	215	int file_create(char *name, int ur, int uw, int ux, int gr,
	216	int gw, int gx, int or, int ow, int ox)
	217	{
	218	int mode, fd;
	219
	220	mode = 0;
	221	mode \|= ur ? S_IRUSR : 0;
	222	mode \|= uw ? S_IWUSR : 0;
	223	mode \|= ux ? S_IXUSR : 0;
	224	mode \|= gr ? S_IRGRP : 0;
	225	mode \|= gw ? S_IWGRP : 0;
	226	mode \|= gx ? S_IXGRP : 0;
	227	mode \|= or ? S_IROTH : 0;
	228	mode \|= ow ? S_IWOTH : 0;
	229	mode \|= ox ? S_IXOTH : 0;
	230	fd = open64(name, O_CREAT \| O_RDWR, mode);
84b3db04	231	if (fd < 0)
f1adc05e JD	232	return -errno;
f1adc05e JD	233	return fd;
1da177e4 LT	234	}
1da177e4 LT	235
5822b7fa	236	int set_attr(const char file, struct hostfs_iattr attrs, int fd)
1da177e4	237	{
5822b7fa AB	238	struct timeval times[2];
5822b7fa AB	239	struct timespec atime_ts, mtime_ts;
1da177e4 LT	240	int err, ma;
1da177e4 LT	241
5822b7fa AB	242	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
	243	if (fd >= 0) {
	244	if (fchmod(fd, attrs->ia_mode) != 0)
	245	return (-errno);
	246	} else if (chmod(file, attrs->ia_mode) != 0) {
f1adc05e	247	return -errno;
5822b7fa	248	}
1da177e4	249	}
5822b7fa AB	250	if (attrs->ia_valid & HOSTFS_ATTR_UID) {
	251	if (fd >= 0) {
	252	if (fchown(fd, attrs->ia_uid, -1))
f1adc05e	253	return -errno;
84b3db04	254	} else if (chown(file, attrs->ia_uid, -1)) {
f1adc05e	255	return -errno;
5822b7fa	256	}
1da177e4	257	}
5822b7fa AB	258	if (attrs->ia_valid & HOSTFS_ATTR_GID) {
	259	if (fd >= 0) {
	260	if (fchown(fd, -1, attrs->ia_gid))
f1adc05e	261	return -errno;
5822b7fa	262	} else if (chown(file, -1, attrs->ia_gid)) {
f1adc05e	263	return -errno;
5822b7fa	264	}
1da177e4	265	}
5822b7fa AB	266	if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
	267	if (fd >= 0) {
	268	if (ftruncate(fd, attrs->ia_size))
f1adc05e	269	return -errno;
5822b7fa	270	} else if (truncate(file, attrs->ia_size)) {
f1adc05e	271	return -errno;
5822b7fa	272	}
1da177e4	273	}
5822b7fa	274
84b3db04 JD	275	/*
84b3db04 JD	276	* Update accessed and/or modified time, in two parts: first set
5822b7fa	277	* times according to the changes to perform, and then call futimes()
84b3db04 JD	278	* or utimes() to apply them.
84b3db04 JD	279	*/
5822b7fa AB	280	ma = (HOSTFS_ATTR_ATIME_SET \| HOSTFS_ATTR_MTIME_SET);
	281	if (attrs->ia_valid & ma) {
	282	err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
	283	&atime_ts, &mtime_ts, NULL, NULL, NULL, fd);
	284	if (err != 0)
	285	return err;
	286
	287	times[0].tv_sec = atime_ts.tv_sec;
d7b88513	288	times[0].tv_usec = atime_ts.tv_nsec / 1000;
5822b7fa	289	times[1].tv_sec = mtime_ts.tv_sec;
d7b88513	290	times[1].tv_usec = mtime_ts.tv_nsec / 1000;
5822b7fa AB	291
	292	if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
	293	times[0].tv_sec = attrs->ia_atime.tv_sec;
d7b88513	294	times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
1da177e4	295	}
5822b7fa AB	296	if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
5822b7fa AB	297	times[1].tv_sec = attrs->ia_mtime.tv_sec;
d7b88513	298	times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
5822b7fa AB	299	}
	300
	301	if (fd >= 0) {
	302	if (futimes(fd, times) != 0)
f1adc05e	303	return -errno;
5822b7fa	304	} else if (utimes(file, times) != 0) {
f1adc05e	305	return -errno;
1da177e4 LT	306	}
1da177e4 LT	307	}
5822b7fa	308
baabd156	309	/* Note: ctime is not handled */
84b3db04	310	if (attrs->ia_valid & (HOSTFS_ATTR_ATIME \| HOSTFS_ATTR_MTIME)) {
1da177e4 LT	311	err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
1da177e4 LT	312	&attrs->ia_atime, &attrs->ia_mtime, NULL,
5822b7fa	313	NULL, NULL, fd);
84b3db04	314	if (err != 0)
f1adc05e	315	return err;
1da177e4	316	}
f1adc05e	317	return 0;
1da177e4 LT	318	}
	319
	320	int make_symlink(const char from, const char to)
	321	{
	322	int err;
	323
	324	err = symlink(to, from);
84b3db04	325	if (err)
f1adc05e JD	326	return -errno;
f1adc05e JD	327	return 0;
1da177e4 LT	328	}
	329
	330	int unlink_file(const char *file)
	331	{
	332	int err;
	333
	334	err = unlink(file);
84b3db04	335	if (err)
f1adc05e JD	336	return -errno;
f1adc05e JD	337	return 0;
1da177e4 LT	338	}
	339
	340	int do_mkdir(const char *file, int mode)
	341	{
	342	int err;
	343
	344	err = mkdir(file, mode);
84b3db04	345	if (err)
f1adc05e JD	346	return -errno;
f1adc05e JD	347	return 0;
1da177e4 LT	348	}
	349
	350	int do_rmdir(const char *file)
	351	{
	352	int err;
	353
	354	err = rmdir(file);
84b3db04	355	if (err)
f1adc05e JD	356	return -errno;
f1adc05e JD	357	return 0;
1da177e4 LT	358	}
1da177e4 LT	359
88f6cd0c	360	int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
1da177e4 LT	361	{
	362	int err;
	363
88f6cd0c	364	err = mknod(file, mode, makedev(major, minor));
84b3db04	365	if (err)
f1adc05e JD	366	return -errno;
f1adc05e JD	367	return 0;
1da177e4 LT	368	}
	369
	370	int link_file(const char to, const char from)
	371	{
	372	int err;
	373
	374	err = link(to, from);
84b3db04	375	if (err)
f1adc05e JD	376	return -errno;
f1adc05e JD	377	return 0;
1da177e4 LT	378	}
	379
	380	int do_readlink(char file, char buf, int size)
	381	{
	382	int n;
	383
	384	n = readlink(file, buf, size);
84b3db04	385	if (n < 0)
f1adc05e	386	return -errno;
84b3db04	387	if (n < size)
1da177e4	388	buf[n] = '\0';
f1adc05e	389	return n;
1da177e4 LT	390	}
	391
	392	int rename_file(char from, char to)
	393	{
	394	int err;
	395
	396	err = rename(from, to);
84b3db04	397	if (err < 0)
f1adc05e JD	398	return -errno;
f1adc05e JD	399	return 0;
1da177e4 LT	400	}
	401
	402	int do_statfs(char root, long bsize_out, long long *blocks_out,
	403	long long bfree_out, long long bavail_out,
	404	long long files_out, long long ffree_out,
	405	void fsid_out, int fsid_size, long namelen_out,
	406	long *spare_out)
	407	{
	408	struct statfs64 buf;
	409	int err;
	410
	411	err = statfs64(root, &buf);
84b3db04	412	if (err < 0)
f1adc05e JD	413	return -errno;
f1adc05e JD	414
1da177e4 LT	415	*bsize_out = buf.f_bsize;
	416	*blocks_out = buf.f_blocks;
	417	*bfree_out = buf.f_bfree;
	418	*bavail_out = buf.f_bavail;
	419	*files_out = buf.f_files;
	420	*ffree_out = buf.f_ffree;
	421	memcpy(fsid_out, &buf.f_fsid,
	422	sizeof(buf.f_fsid) > fsid_size ? fsid_size :
	423	sizeof(buf.f_fsid));
	424	*namelen_out = buf.f_namelen;
	425	spare_out[0] = buf.f_spare[0];
	426	spare_out[1] = buf.f_spare[1];
	427	spare_out[2] = buf.f_spare[2];
	428	spare_out[3] = buf.f_spare[3];
	429	spare_out[4] = buf.f_spare[4];
f1adc05e	430	return 0;
1da177e4	431	}