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