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acrn-kernel/fs/hostfs/hostfs_user.c

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/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* 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);
if(inode_out != NULL) *inode_out = buf.st_ino;
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:
*/
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