fs/hostfs/hostfs_user.c - linux-imx - Git at Google

 /*
  * 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;
 }
	/*
	* 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;
	}