mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 00:52:01 +00:00
0c9bd6365d
Currently hostfs issues every time a seekdir(), in fact it has to do this only upon the first call. Also telldir() can be omitted as we can obtain the directory offset from readdir(). Signed-off-by: Richard Weinberger <richard@nod.at>
411 lines
7.3 KiB
C
411 lines
7.3 KiB
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 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;
|
|
}
|