[linux-block.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 statx_to_hostfs(const struct statx *buf, struct hostfs_stat *p)
{
	p->ino = buf->stx_ino;
	p->mode = buf->stx_mode;
	p->nlink = buf->stx_nlink;
	p->uid = buf->stx_uid;
	p->gid = buf->stx_gid;
	p->size = buf->stx_size;
	p->atime.tv_sec = buf->stx_atime.tv_sec;
	p->atime.tv_nsec = buf->stx_atime.tv_nsec;
	p->ctime.tv_sec = buf->stx_ctime.tv_sec;
	p->ctime.tv_nsec = buf->stx_ctime.tv_nsec;
	p->mtime.tv_sec = buf->stx_mtime.tv_sec;
	p->mtime.tv_nsec = buf->stx_mtime.tv_nsec;
	if (buf->stx_mask & STATX_BTIME) {
		p->btime.tv_sec = buf->stx_btime.tv_sec;
		p->btime.tv_nsec = buf->stx_btime.tv_nsec;
	} else {
		memset(&p->btime, 0, sizeof(p->btime));
	}
	p->blksize = buf->stx_blksize;
	p->blocks = buf->stx_blocks;
	p->rdev.maj = buf->stx_rdev_major;
	p->rdev.min = buf->stx_rdev_minor;
	p->dev.maj = buf->stx_dev_major;
	p->dev.min = buf->stx_dev_minor;
}

int stat_file(const char *path, struct hostfs_stat *p, int fd)
{
	struct statx buf;
	int flags = AT_SYMLINK_NOFOLLOW;

	if (fd >= 0) {
		flags |= AT_EMPTY_PATH;
		path = "";
	}

	if ((statx(fd, path, flags, STATX_BASIC_STATS | STATX_BTIME, &buf)) < 0)
		return -errno;

	statx_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 hostfs_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 statx_to_hostfs(const struct statx buf, struct hostfs_stat p)
	22	{
	23	p->ino = buf->stx_ino;
	24	p->mode = buf->stx_mode;
	25	p->nlink = buf->stx_nlink;
	26	p->uid = buf->stx_uid;
	27	p->gid = buf->stx_gid;
	28	p->size = buf->stx_size;
	29	p->atime.tv_sec = buf->stx_atime.tv_sec;
	30	p->atime.tv_nsec = buf->stx_atime.tv_nsec;
	31	p->ctime.tv_sec = buf->stx_ctime.tv_sec;
	32	p->ctime.tv_nsec = buf->stx_ctime.tv_nsec;
	33	p->mtime.tv_sec = buf->stx_mtime.tv_sec;
	34	p->mtime.tv_nsec = buf->stx_mtime.tv_nsec;
	35	if (buf->stx_mask & STATX_BTIME) {
	36	p->btime.tv_sec = buf->stx_btime.tv_sec;
	37	p->btime.tv_nsec = buf->stx_btime.tv_nsec;
	38	} else {
	39	memset(&p->btime, 0, sizeof(p->btime));
	40	}
	41	p->blksize = buf->stx_blksize;
	42	p->blocks = buf->stx_blocks;
	43	p->rdev.maj = buf->stx_rdev_major;
	44	p->rdev.min = buf->stx_rdev_minor;
	45	p->dev.maj = buf->stx_dev_major;
	46	p->dev.min = buf->stx_dev_minor;
	47	}
	48
	49	int stat_file(const char path, struct hostfs_stat p, int fd)
	50	{
	51	struct statx buf;
	52	int flags = AT_SYMLINK_NOFOLLOW;
	53
	54	if (fd >= 0) {
	55	flags \|= AT_EMPTY_PATH;
	56	path = "";
	57	}
	58
	59	if ((statx(fd, path, flags, STATX_BASIC_STATS \| STATX_BTIME, &buf)) < 0)
	60	return -errno;
	61
	62	statx_to_hostfs(&buf, p);
	63	return 0;
	64	}
	65
	66	int access_file(char *path, int r, int w, int x)
	67	{
	68	int mode = 0;
	69
	70	if (r)
	71	mode = R_OK;
	72	if (w)
	73	mode \|= W_OK;
	74	if (x)
	75	mode \|= X_OK;
	76	if (access(path, mode) != 0)
	77	return -errno;
	78	else return 0;
	79	}
	80
	81	int open_file(char *path, int r, int w, int append)
	82	{
	83	int mode = 0, fd;
	84
	85	if (r && !w)
	86	mode = O_RDONLY;
	87	else if (!r && w)
	88	mode = O_WRONLY;
	89	else if (r && w)
	90	mode = O_RDWR;
	91	else panic("Impossible mode in open_file");
	92
	93	if (append)
	94	mode \|= O_APPEND;
	95	fd = open64(path, mode);
	96	if (fd < 0)
	97	return -errno;
	98	else return fd;
	99	}
	100
	101	void open_dir(char path, int *err_out)
	102	{
	103	DIR *dir;
	104
	105	dir = opendir(path);
	106	*err_out = errno;
	107
	108	return dir;
	109	}
	110
	111	void seek_dir(void *stream, unsigned long long pos)
	112	{
	113	DIR *dir = stream;
	114
	115	seekdir(dir, pos);
	116	}
	117
	118	char read_dir(void stream, unsigned long long *pos_out,
	119	unsigned long long ino_out, int len_out,
	120	unsigned int *type_out)
	121	{
	122	DIR *dir = stream;
	123	struct dirent *ent;
	124
	125	ent = readdir(dir);
	126	if (ent == NULL)
	127	return NULL;
	128	*len_out = strlen(ent->d_name);
	129	*ino_out = ent->d_ino;
	130	*type_out = ent->d_type;
	131	*pos_out = ent->d_off;
	132	return ent->d_name;
	133	}
	134
	135	int read_file(int fd, unsigned long long offset, char buf, int len)
	136	{
	137	int n;
	138
	139	n = pread64(fd, buf, len, *offset);
	140	if (n < 0)
	141	return -errno;
	142	*offset += n;
	143	return n;
	144	}
	145
	146	int write_file(int fd, unsigned long long offset, const char buf, int len)
	147	{
	148	int n;
	149
	150	n = pwrite64(fd, buf, len, *offset);
	151	if (n < 0)
	152	return -errno;
	153	*offset += n;
	154	return n;
	155	}
	156
	157	int lseek_file(int fd, long long offset, int whence)
	158	{
	159	int ret;
	160
	161	ret = lseek64(fd, offset, whence);
	162	if (ret < 0)
	163	return -errno;
	164	return 0;
	165	}
	166
	167	int fsync_file(int fd, int datasync)
	168	{
	169	int ret;
	170	if (datasync)
	171	ret = fdatasync(fd);
	172	else
	173	ret = fsync(fd);
	174
	175	if (ret < 0)
	176	return -errno;
	177	return 0;
	178	}
	179
	180	int replace_file(int oldfd, int fd)
	181	{
	182	return dup2(oldfd, fd);
	183	}
	184
	185	void close_file(void *stream)
	186	{
	187	close(((int ) stream));
	188	}
	189
	190	void close_dir(void *stream)
	191	{
	192	closedir(stream);
	193	}
	194
	195	int file_create(char *name, int mode)
	196	{
	197	int fd;
	198
	199	fd = open64(name, O_CREAT \| O_RDWR, mode);
	200	if (fd < 0)
	201	return -errno;
	202	return fd;
	203	}
	204
	205	int set_attr(const char file, struct hostfs_iattr attrs, int fd)
	206	{
	207	struct hostfs_stat st;
	208	struct timeval times[2];
	209	int err, ma;
	210
	211	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
	212	if (fd >= 0) {
	213	if (fchmod(fd, attrs->ia_mode) != 0)
	214	return -errno;
	215	} else if (chmod(file, attrs->ia_mode) != 0) {
	216	return -errno;
	217	}
	218	}
	219	if (attrs->ia_valid & HOSTFS_ATTR_UID) {
	220	if (fd >= 0) {
	221	if (fchown(fd, attrs->ia_uid, -1))
	222	return -errno;
	223	} else if (chown(file, attrs->ia_uid, -1)) {
	224	return -errno;
	225	}
	226	}
	227	if (attrs->ia_valid & HOSTFS_ATTR_GID) {
	228	if (fd >= 0) {
	229	if (fchown(fd, -1, attrs->ia_gid))
	230	return -errno;
	231	} else if (chown(file, -1, attrs->ia_gid)) {
	232	return -errno;
	233	}
	234	}
	235	if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
	236	if (fd >= 0) {
	237	if (ftruncate(fd, attrs->ia_size))
	238	return -errno;
	239	} else if (truncate(file, attrs->ia_size)) {
	240	return -errno;
	241	}
	242	}
	243
	244	/*
	245	* Update accessed and/or modified time, in two parts: first set
	246	* times according to the changes to perform, and then call futimes()
	247	* or utimes() to apply them.
	248	*/
	249	ma = (HOSTFS_ATTR_ATIME_SET \| HOSTFS_ATTR_MTIME_SET);
	250	if (attrs->ia_valid & ma) {
	251	err = stat_file(file, &st, fd);
	252	if (err != 0)
	253	return err;
	254
	255	times[0].tv_sec = st.atime.tv_sec;
	256	times[0].tv_usec = st.atime.tv_nsec / 1000;
	257	times[1].tv_sec = st.mtime.tv_sec;
	258	times[1].tv_usec = st.mtime.tv_nsec / 1000;
	259
	260	if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
	261	times[0].tv_sec = attrs->ia_atime.tv_sec;
	262	times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
	263	}
	264	if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
	265	times[1].tv_sec = attrs->ia_mtime.tv_sec;
	266	times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
	267	}
	268
	269	if (fd >= 0) {
	270	if (futimes(fd, times) != 0)
	271	return -errno;
	272	} else if (utimes(file, times) != 0) {
	273	return -errno;
	274	}
	275	}
	276
	277	/* Note: ctime is not handled */
	278	if (attrs->ia_valid & (HOSTFS_ATTR_ATIME \| HOSTFS_ATTR_MTIME)) {
	279	err = stat_file(file, &st, fd);
	280	attrs->ia_atime = st.atime;
	281	attrs->ia_mtime = st.mtime;
	282	if (err != 0)
	283	return err;
	284	}
	285	return 0;
	286	}
	287
	288	int make_symlink(const char from, const char to)
	289	{
	290	int err;
	291
	292	err = symlink(to, from);
	293	if (err)
	294	return -errno;
	295	return 0;
	296	}
	297
	298	int unlink_file(const char *file)
	299	{
	300	int err;
	301
	302	err = unlink(file);
	303	if (err)
	304	return -errno;
	305	return 0;
	306	}
	307
	308	int do_mkdir(const char *file, int mode)
	309	{
	310	int err;
	311
	312	err = mkdir(file, mode);
	313	if (err)
	314	return -errno;
	315	return 0;
	316	}
	317
	318	int hostfs_do_rmdir(const char *file)
	319	{
	320	int err;
	321
	322	err = rmdir(file);
	323	if (err)
	324	return -errno;
	325	return 0;
	326	}
	327
	328	int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
	329	{
	330	int err;
	331
	332	err = mknod(file, mode, os_makedev(major, minor));
	333	if (err)
	334	return -errno;
	335	return 0;
	336	}
	337
	338	int link_file(const char to, const char from)
	339	{
	340	int err;
	341
	342	err = link(to, from);
	343	if (err)
	344	return -errno;
	345	return 0;
	346	}
	347
	348	int hostfs_do_readlink(char file, char buf, int size)
	349	{
	350	int n;
	351
	352	n = readlink(file, buf, size);
	353	if (n < 0)
	354	return -errno;
	355	if (n < size)
	356	buf[n] = '\0';
	357	return n;
	358	}
	359
	360	int rename_file(char from, char to)
	361	{
	362	int err;
	363
	364	err = rename(from, to);
	365	if (err < 0)
	366	return -errno;
	367	return 0;
	368	}
	369
	370	int rename2_file(char from, char to, unsigned int flags)
	371	{
	372	int err;
	373
	374	#ifndef SYS_renameat2
	375	# ifdef __x86_64__
	376	# define SYS_renameat2 316
	377	# endif
	378	# ifdef __i386__
	379	# define SYS_renameat2 353
	380	# endif
	381	#endif
	382
	383	#ifdef SYS_renameat2
	384	err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
	385	if (err < 0) {
	386	if (errno != ENOSYS)
	387	return -errno;
	388	else
	389	return -EINVAL;
	390	}
	391	return 0;
	392	#else
	393	return -EINVAL;
	394	#endif
	395	}
	396
	397	int do_statfs(char root, long bsize_out, long long *blocks_out,
	398	long long bfree_out, long long bavail_out,
	399	long long files_out, long long ffree_out,
	400	void fsid_out, int fsid_size, long namelen_out)
	401	{
	402	struct statfs64 buf;
	403	int err;
	404
	405	err = statfs64(root, &buf);
	406	if (err < 0)
	407	return -errno;
	408
	409	*bsize_out = buf.f_bsize;
	410	*blocks_out = buf.f_blocks;
	411	*bfree_out = buf.f_bfree;
	412	*bavail_out = buf.f_bavail;
	413	*files_out = buf.f_files;
	414	*ffree_out = buf.f_ffree;
	415	memcpy(fsid_out, &buf.f_fsid,
	416	sizeof(buf.f_fsid) > fsid_size ? fsid_size :
	417	sizeof(buf.f_fsid));
	418	*namelen_out = buf.f_namelen;
	419
	420	return 0;
	421	}