hostfs_user.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 366 行

/*
 * Copyright (C) 2000 Jeff Dike ([e-mail])
 * Licensed under the GPL
 */

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <utime.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/vfs.h>
#include "hostfs.h"
#include "kern_util.h"
#include "user.h"

int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
	      int *nlink_out, int *uid_out, int *gid_out,
	      unsigned long long *size_out, struct timespec *atime_out,
	      struct timespec *mtime_out, struct timespec *ctime_out,
	      int *blksize_out, unsigned long long *blocks_out)
{
	struct stat64 buf;

	if(lstat64(path, &buf) < 0)
		return(-errno);

	/* See the Makefile for why STAT64_INO_FIELD is passed in
	 * by the build
	 */
	if(inode_out != NULL) *inode_out = buf.STAT64_INO_FIELD;
	if(mode_out != NULL) *mode_out = buf.st_mode;
	if(nlink_out != NULL) *nlink_out = buf.st_nlink;
	if(uid_out != NULL) *uid_out = buf.st_uid;
	if(gid_out != NULL) *gid_out = buf.st_gid;
	if(size_out != NULL) *size_out = buf.st_size;
	if(atime_out != NULL) {
		atime_out->tv_sec = buf.st_atime;
		atime_out->tv_nsec = 0;
	}
	if(mtime_out != NULL) {
		mtime_out->tv_sec = buf.st_mtime;
		mtime_out->tv_nsec = 0;
	}
	if(ctime_out != NULL) {
		ctime_out->tv_sec = buf.st_ctime;
		ctime_out->tv_nsec = 0;
	}
	if(blksize_out != NULL) *blksize_out = buf.st_blksize;
	if(blocks_out != NULL) *blocks_out = buf.st_blocks;
	return(0);
}

int file_type(const char *path, int *maj, int *min)
{
 	struct stat64 buf;

	if(lstat64(path, &buf) < 0)
		return(-errno);
	/*We cannot pass rdev as is because glibc and the kernel disagree
	 *about its definition.*/
	if(maj != NULL)
		*maj = major(buf.st_rdev);
	if(min != NULL)
		*min = minor(buf.st_rdev);

	if(S_ISDIR(buf.st_mode)) return(OS_TYPE_DIR);
	else if(S_ISLNK(buf.st_mode)) return(OS_TYPE_SYMLINK);
	else if(S_ISCHR(buf.st_mode)) return(OS_TYPE_CHARDEV);
	else if(S_ISBLK(buf.st_mode)) return(OS_TYPE_BLOCKDEV);
	else if(S_ISFIFO(buf.st_mode))return(OS_TYPE_FIFO);
	else if(S_ISSOCK(buf.st_mode))return(OS_TYPE_SOCK);
	else return(OS_TYPE_FILE);
}

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;
	if(dir == NULL) return(NULL);
	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);
}

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)
{
	struct utimbuf buf;
	int err, ma;

	if(attrs->ia_valid & HOSTFS_ATTR_MODE){
		if(chmod(file, attrs->ia_mode) != 0) return(-errno);
	}
	if(attrs->ia_valid & HOSTFS_ATTR_UID){
		if(chown(file, attrs->ia_uid, -1)) return(-errno);
	}
	if(attrs->ia_valid & HOSTFS_ATTR_GID){
		if(chown(file, -1, attrs->ia_gid)) return(-errno);
	}
	if(attrs->ia_valid & HOSTFS_ATTR_SIZE){
		if(truncate(file, attrs->ia_size)) return(-errno);
	}
	ma = HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET;
	if((attrs->ia_valid & ma) == ma){
		buf.actime = attrs->ia_atime.tv_sec;
		buf.modtime = attrs->ia_mtime.tv_sec;
		if(utime(file, &buf) != 0) return(-errno);
	}
	else {
		struct timespec ts;

		if(attrs->ia_valid & HOSTFS_ATTR_ATIME_SET){
			err = stat_file(file, NULL, NULL, NULL, NULL, NULL,
					NULL, NULL, &ts, NULL, NULL, NULL);
			if(err != 0)
				return(err);
			buf.actime = attrs->ia_atime.tv_sec;
			buf.modtime = ts.tv_sec;
			if(utime(file, &buf) != 0)
				return(-errno);
		}
		if(attrs->ia_valid & HOSTFS_ATTR_MTIME_SET){
			err = stat_file(file, NULL, NULL, NULL, NULL, NULL,
					NULL, &ts, NULL, NULL, NULL, NULL);
			if(err != 0)
				return(err);
			buf.actime = ts.tv_sec;
			buf.modtime = attrs->ia_mtime.tv_sec;
			if(utime(file, &buf) != 0)
				return(-errno);
		}
	}
	if(attrs->ia_valid & HOSTFS_ATTR_CTIME) ;
	if(attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)){
		err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
				&attrs->ia_atime, &attrs->ia_mtime, NULL,
				NULL, NULL);
		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, int dev)
{
	int err;

	err = mknod(file, mode, dev);
	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 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,
	      long *spare_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;
	spare_out[0] = buf.f_spare[0];
	spare_out[1] = buf.f_spare[1];
	spare_out[2] = buf.f_spare[2];
	spare_out[3] = buf.f_spare[3];
	spare_out[4] = buf.f_spare[4];
	spare_out[5] = buf.f_spare[5];
	return(0);
}

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */