[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>

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