[linux.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 <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)
{
	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;
}

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 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 LT	16	#include <sys/vfs.h>
1da177e4 LT	17	#include "hostfs.h"
84b3db04	18	#include "os.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,
	101	unsigned long long ino_out, int len_out)
	102	{
	103	DIR *dir = stream;
	104	struct dirent *ent;
	105
	106	seekdir(dir, *pos);
	107	ent = readdir(dir);
84b3db04	108	if (ent == NULL)
f1adc05e	109	return NULL;
1da177e4 LT	110	*len_out = strlen(ent->d_name);
	111	*ino_out = ent->d_ino;
	112	*pos = telldir(dir);
f1adc05e	113	return ent->d_name;
1da177e4 LT	114	}
	115
	116	int read_file(int fd, unsigned long long offset, char buf, int len)
	117	{
	118	int n;
	119
	120	n = pread64(fd, buf, len, *offset);
84b3db04	121	if (n < 0)
f1adc05e	122	return -errno;
1da177e4	123	*offset += n;
f1adc05e	124	return n;
1da177e4 LT	125	}
	126
	127	int write_file(int fd, unsigned long long offset, const char buf, int len)
	128	{
	129	int n;
	130
	131	n = pwrite64(fd, buf, len, *offset);
84b3db04	132	if (n < 0)
f1adc05e	133	return -errno;
1da177e4	134	*offset += n;
f1adc05e	135	return n;
1da177e4 LT	136	}
	137
	138	int lseek_file(int fd, long long offset, int whence)
	139	{
	140	int ret;
	141
	142	ret = lseek64(fd, offset, whence);
84b3db04	143	if (ret < 0)
f1adc05e JD	144	return -errno;
f1adc05e JD	145	return 0;
1da177e4 LT	146	}
1da177e4 LT	147
a2d76bd8 PBG	148	int fsync_file(int fd, int datasync)
	149	{
	150	int ret;
	151	if (datasync)
	152	ret = fdatasync(fd);
	153	else
	154	ret = fsync(fd);
	155
	156	if (ret < 0)
	157	return -errno;
	158	return 0;
	159	}
	160
f8ad850f AV	161	int replace_file(int oldfd, int fd)
	162	{
	163	return dup2(oldfd, fd);
	164	}
	165
1da177e4 LT	166	void close_file(void *stream)
	167	{
	168	close(((int ) stream));
	169	}
	170
	171	void close_dir(void *stream)
	172	{
	173	closedir(stream);
	174	}
	175
	176	int file_create(char *name, int ur, int uw, int ux, int gr,
	177	int gw, int gx, int or, int ow, int ox)
	178	{
	179	int mode, fd;
	180
	181	mode = 0;
	182	mode \|= ur ? S_IRUSR : 0;
	183	mode \|= uw ? S_IWUSR : 0;
	184	mode \|= ux ? S_IXUSR : 0;
	185	mode \|= gr ? S_IRGRP : 0;
	186	mode \|= gw ? S_IWGRP : 0;
	187	mode \|= gx ? S_IXGRP : 0;
	188	mode \|= or ? S_IROTH : 0;
	189	mode \|= ow ? S_IWOTH : 0;
	190	mode \|= ox ? S_IXOTH : 0;
	191	fd = open64(name, O_CREAT \| O_RDWR, mode);
84b3db04	192	if (fd < 0)
f1adc05e JD	193	return -errno;
f1adc05e JD	194	return fd;
1da177e4 LT	195	}
1da177e4 LT	196
5822b7fa	197	int set_attr(const char file, struct hostfs_iattr attrs, int fd)
1da177e4	198	{
39b743c6	199	struct hostfs_stat st;
5822b7fa	200	struct timeval times[2];
1da177e4 LT	201	int err, ma;
1da177e4 LT	202
5822b7fa AB	203	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
	204	if (fd >= 0) {
	205	if (fchmod(fd, attrs->ia_mode) != 0)
c5c6dd4e	206	return -errno;
5822b7fa	207	} else if (chmod(file, attrs->ia_mode) != 0) {
f1adc05e	208	return -errno;
5822b7fa	209	}
1da177e4	210	}
5822b7fa AB	211	if (attrs->ia_valid & HOSTFS_ATTR_UID) {
	212	if (fd >= 0) {
	213	if (fchown(fd, attrs->ia_uid, -1))
f1adc05e	214	return -errno;
84b3db04	215	} else if (chown(file, attrs->ia_uid, -1)) {
f1adc05e	216	return -errno;
5822b7fa	217	}
1da177e4	218	}
5822b7fa AB	219	if (attrs->ia_valid & HOSTFS_ATTR_GID) {
	220	if (fd >= 0) {
	221	if (fchown(fd, -1, attrs->ia_gid))
f1adc05e	222	return -errno;
5822b7fa	223	} else if (chown(file, -1, attrs->ia_gid)) {
f1adc05e	224	return -errno;
5822b7fa	225	}
1da177e4	226	}
5822b7fa AB	227	if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
	228	if (fd >= 0) {
	229	if (ftruncate(fd, attrs->ia_size))
f1adc05e	230	return -errno;
5822b7fa	231	} else if (truncate(file, attrs->ia_size)) {
f1adc05e	232	return -errno;
5822b7fa	233	}
1da177e4	234	}
5822b7fa	235
84b3db04 JD	236	/*
84b3db04 JD	237	* Update accessed and/or modified time, in two parts: first set
5822b7fa	238	* times according to the changes to perform, and then call futimes()
84b3db04 JD	239	* or utimes() to apply them.
84b3db04 JD	240	*/
5822b7fa AB	241	ma = (HOSTFS_ATTR_ATIME_SET \| HOSTFS_ATTR_MTIME_SET);
5822b7fa AB	242	if (attrs->ia_valid & ma) {
39b743c6	243	err = stat_file(file, &st, fd);
5822b7fa AB	244	if (err != 0)
	245	return err;
	246
39b743c6 AV	247	times[0].tv_sec = st.atime.tv_sec;
	248	times[0].tv_usec = st.atime.tv_nsec / 1000;
	249	times[1].tv_sec = st.mtime.tv_sec;
	250	times[1].tv_usec = st.mtime.tv_nsec / 1000;
5822b7fa AB	251
	252	if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
	253	times[0].tv_sec = attrs->ia_atime.tv_sec;
d7b88513	254	times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
1da177e4	255	}
5822b7fa AB	256	if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
5822b7fa AB	257	times[1].tv_sec = attrs->ia_mtime.tv_sec;
d7b88513	258	times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
5822b7fa AB	259	}
	260
	261	if (fd >= 0) {
	262	if (futimes(fd, times) != 0)
f1adc05e	263	return -errno;
5822b7fa	264	} else if (utimes(file, times) != 0) {
f1adc05e	265	return -errno;
1da177e4 LT	266	}
1da177e4 LT	267	}
5822b7fa	268
baabd156	269	/* Note: ctime is not handled */
84b3db04	270	if (attrs->ia_valid & (HOSTFS_ATTR_ATIME \| HOSTFS_ATTR_MTIME)) {
39b743c6 AV	271	err = stat_file(file, &st, fd);
	272	attrs->ia_atime = st.atime;
	273	attrs->ia_mtime = st.mtime;
84b3db04	274	if (err != 0)
f1adc05e	275	return err;
1da177e4	276	}
f1adc05e	277	return 0;
1da177e4 LT	278	}
	279
	280	int make_symlink(const char from, const char to)
	281	{
	282	int err;
	283
	284	err = symlink(to, from);
84b3db04	285	if (err)
f1adc05e JD	286	return -errno;
f1adc05e JD	287	return 0;
1da177e4 LT	288	}
	289
	290	int unlink_file(const char *file)
	291	{
	292	int err;
	293
	294	err = unlink(file);
84b3db04	295	if (err)
f1adc05e JD	296	return -errno;
f1adc05e JD	297	return 0;
1da177e4 LT	298	}
	299
	300	int do_mkdir(const char *file, int mode)
	301	{
	302	int err;
	303
	304	err = mkdir(file, mode);
84b3db04	305	if (err)
f1adc05e JD	306	return -errno;
f1adc05e JD	307	return 0;
1da177e4 LT	308	}
	309
	310	int do_rmdir(const char *file)
	311	{
	312	int err;
	313
	314	err = rmdir(file);
84b3db04	315	if (err)
f1adc05e JD	316	return -errno;
f1adc05e JD	317	return 0;
1da177e4 LT	318	}
1da177e4 LT	319
88f6cd0c	320	int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
1da177e4 LT	321	{
	322	int err;
	323
005a59ec	324	err = mknod(file, mode, os_makedev(major, minor));
84b3db04	325	if (err)
f1adc05e JD	326	return -errno;
f1adc05e JD	327	return 0;
1da177e4 LT	328	}
	329
	330	int link_file(const char to, const char from)
	331	{
	332	int err;
	333
	334	err = link(to, from);
84b3db04	335	if (err)
f1adc05e JD	336	return -errno;
f1adc05e JD	337	return 0;
1da177e4 LT	338	}
1da177e4 LT	339
ea7e743e	340	int hostfs_do_readlink(char file, char buf, int size)
1da177e4 LT	341	{
	342	int n;
	343
	344	n = readlink(file, buf, size);
84b3db04	345	if (n < 0)
f1adc05e	346	return -errno;
84b3db04	347	if (n < size)
1da177e4	348	buf[n] = '\0';
f1adc05e	349	return n;
1da177e4 LT	350	}
	351
	352	int rename_file(char from, char to)
	353	{
	354	int err;
	355
	356	err = rename(from, to);
84b3db04	357	if (err < 0)
f1adc05e JD	358	return -errno;
f1adc05e JD	359	return 0;
1da177e4 LT	360	}
	361
	362	int do_statfs(char root, long bsize_out, long long *blocks_out,
	363	long long bfree_out, long long bavail_out,
	364	long long files_out, long long ffree_out,
1b627d57	365	void fsid_out, int fsid_size, long namelen_out)
1da177e4 LT	366	{
	367	struct statfs64 buf;
	368	int err;
	369
	370	err = statfs64(root, &buf);
84b3db04	371	if (err < 0)
f1adc05e JD	372	return -errno;
f1adc05e JD	373
1da177e4 LT	374	*bsize_out = buf.f_bsize;
	375	*blocks_out = buf.f_blocks;
	376	*bfree_out = buf.f_bfree;
	377	*bavail_out = buf.f_bavail;
	378	*files_out = buf.f_files;
	379	*ffree_out = buf.f_ffree;
	380	memcpy(fsid_out, &buf.f_fsid,
	381	sizeof(buf.f_fsid) > fsid_size ? fsid_size :
	382	sizeof(buf.f_fsid));
	383	*namelen_out = buf.f_namelen;
1b627d57	384
f1adc05e	385	return 0;
1da177e4	386	}