[mirror_ubuntu-artful-kernel.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;
}

void seek_dir(void *stream, unsigned long long pos)
{
	DIR *dir = stream;

	seekdir(dir, pos);
}

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

	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_out = ent->d_off;
	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 mode)
{
	int fd;

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