225 lines
6.7 KiB
C
225 lines
6.7 KiB
C
/* This file contains the code for performing four system calls relating to
|
|
* status and directories.
|
|
*
|
|
* The entry points into this file are
|
|
* do_chdir: perform the CHDIR system call
|
|
* do_chroot: perform the CHROOT system call
|
|
* do_lstat: perform the LSTAT system call
|
|
* do_stat: perform the STAT system call
|
|
* do_fstat: perform the FSTAT system call
|
|
* do_fstatfs: perform the FSTATFS system call
|
|
* do_statvfs: perform the STATVFS system call
|
|
* do_fstatvfs: perform the FSTATVFS system call
|
|
*/
|
|
|
|
#include "fs.h"
|
|
#include <sys/stat.h>
|
|
#include <sys/statfs.h>
|
|
#include <minix/com.h>
|
|
#include <minix/u64.h>
|
|
#include <string.h>
|
|
#include "file.h"
|
|
#include "fproc.h"
|
|
#include "param.h"
|
|
#include <minix/vfsif.h>
|
|
#include "vnode.h"
|
|
#include "vmnt.h"
|
|
|
|
FORWARD _PROTOTYPE( int change, (struct vnode **iip, char *name_ptr, int len));
|
|
FORWARD _PROTOTYPE( int change_into, (struct vnode **iip, struct vnode *vp));
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_fchdir *
|
|
*===========================================================================*/
|
|
PUBLIC int do_fchdir()
|
|
{
|
|
/* Change directory on already-opened fd. */
|
|
struct filp *rfilp;
|
|
|
|
/* Is the file descriptor valid? */
|
|
if ((rfilp = get_filp(m_in.fd)) == NULL) return(err_code);
|
|
dup_vnode(rfilp->filp_vno); /* Change into expects a reference. */
|
|
return change_into(&fp->fp_wd, rfilp->filp_vno);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_chdir *
|
|
*===========================================================================*/
|
|
PUBLIC int do_chdir()
|
|
{
|
|
/* Perform the chdir(name) system call. */
|
|
|
|
return change(&fp->fp_wd, m_in.name, m_in.name_length);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_chroot *
|
|
*===========================================================================*/
|
|
PUBLIC int do_chroot()
|
|
{
|
|
/* Perform the chroot(name) system call. */
|
|
|
|
if (!super_user) return(EPERM); /* only su may chroot() */
|
|
return change(&fp->fp_rd, m_in.name, m_in.name_length);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* change *
|
|
*===========================================================================*/
|
|
PRIVATE int change(iip, name_ptr, len)
|
|
struct vnode **iip; /* pointer to the inode pointer for the dir */
|
|
char *name_ptr; /* pointer to the directory name to change to */
|
|
int len; /* length of the directory name string */
|
|
{
|
|
/* Do the actual work for chdir() and chroot(). */
|
|
struct vnode *vp;
|
|
|
|
/* Try to open the directory */
|
|
if (fetch_name(name_ptr, len, M3) != OK) return(err_code);
|
|
if ((vp = eat_path(PATH_NOFLAGS)) == NULL) return(err_code);
|
|
return change_into(iip, vp);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* change_into *
|
|
*===========================================================================*/
|
|
PRIVATE int change_into(iip, vp)
|
|
struct vnode **iip; /* pointer to the inode pointer for the dir */
|
|
struct vnode *vp; /* this is what the inode has to become */
|
|
{
|
|
int r;
|
|
|
|
/* It must be a directory and also be searchable */
|
|
if ((vp->v_mode & I_TYPE) != I_DIRECTORY)
|
|
r = ENOTDIR;
|
|
else
|
|
r = forbidden(vp, X_BIT); /* Check if dir is searchable*/
|
|
|
|
/* If error, return vnode */
|
|
if (r != OK) {
|
|
put_vnode(vp);
|
|
return(r);
|
|
}
|
|
|
|
/* Everything is OK. Make the change. */
|
|
put_vnode(*iip); /* release the old directory */
|
|
*iip = vp; /* acquire the new one */
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_stat *
|
|
*===========================================================================*/
|
|
PUBLIC int do_stat()
|
|
{
|
|
/* Perform the stat(name, buf) system call. */
|
|
int r;
|
|
struct vnode *vp;
|
|
|
|
if (fetch_name(m_in.name1, m_in.name1_length, M1) != OK) return(err_code);
|
|
if ((vp = eat_path(PATH_NOFLAGS)) == NULL) return(err_code);
|
|
r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, m_in.name2, 0);
|
|
|
|
put_vnode(vp);
|
|
return r;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_fstat *
|
|
*===========================================================================*/
|
|
PUBLIC int do_fstat()
|
|
{
|
|
/* Perform the fstat(fd, buf) system call. */
|
|
register struct filp *rfilp;
|
|
int pipe_pos = 0;
|
|
|
|
/* Is the file descriptor valid? */
|
|
if ((rfilp = get_filp(m_in.fd)) == NULL) return(err_code);
|
|
|
|
/* If we read from a pipe, send position too */
|
|
if (rfilp->filp_vno->v_pipe == I_PIPE) {
|
|
if (rfilp->filp_mode & R_BIT)
|
|
if (ex64hi(rfilp->filp_pos) != 0) {
|
|
panic("do_fstat: bad position in pipe");
|
|
}
|
|
pipe_pos = ex64lo(rfilp->filp_pos);
|
|
}
|
|
|
|
return req_stat(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr,
|
|
who_e, m_in.buffer, pipe_pos);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_fstatfs *
|
|
*===========================================================================*/
|
|
PUBLIC int do_fstatfs()
|
|
{
|
|
/* Perform the fstatfs(fd, buf) system call. */
|
|
struct filp *rfilp;
|
|
|
|
/* Is the file descriptor valid? */
|
|
if( (rfilp = get_filp(m_in.fd)) == NULL) return(err_code);
|
|
|
|
return req_fstatfs(rfilp->filp_vno->v_fs_e, who_e, m_in.buffer);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_statvfs *
|
|
*===========================================================================*/
|
|
PUBLIC int do_statvfs()
|
|
{
|
|
/* Perform the stat(name, buf) system call. */
|
|
int r;
|
|
struct vnode *vp;
|
|
|
|
if (fetch_name(m_in.STATVFS_NAME, m_in.STATVFS_LEN, M1) != OK) return(err_code);
|
|
if ((vp = eat_path(PATH_NOFLAGS)) == NULL) return(err_code);
|
|
r = req_statvfs(vp->v_fs_e, who_e, m_in.STATVFS_BUF);
|
|
|
|
put_vnode(vp);
|
|
return r;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_fstatvfs *
|
|
*===========================================================================*/
|
|
PUBLIC int do_fstatvfs()
|
|
{
|
|
/* Perform the fstat(fd, buf) system call. */
|
|
register struct filp *rfilp;
|
|
|
|
/* Is the file descriptor valid? */
|
|
if ((rfilp = get_filp(m_in.FSTATVFS_FD)) == NULL) return(err_code);
|
|
|
|
return req_statvfs(rfilp->filp_vno->v_fs_e, who_e, m_in.FSTATVFS_BUF);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_lstat *
|
|
*===========================================================================*/
|
|
PUBLIC int do_lstat()
|
|
{
|
|
/* Perform the lstat(name, buf) system call. */
|
|
struct vnode *vp;
|
|
int r;
|
|
|
|
if (fetch_name(m_in.name1, m_in.name1_length, M1) != OK) return(err_code);
|
|
if ((vp = eat_path(PATH_RET_SYMLINK)) == NULL) return(err_code);
|
|
r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, m_in.name2, 0);
|
|
|
|
put_vnode(vp);
|
|
return(r);
|
|
}
|
|
|
|
|