/*===========================================================================*
* do_link *
*===========================================================================*/
PUBLIC int do_link()
{
/* Perform the link(name1, name2) system call. */
int r;
endpoint_t linked_fs_e, link_lastdir_fs_e;
struct vnode *vp_o, *vp_d;
if (fetch_name(m_in.name1, m_in.name1_length, M1) != OK)
return(err_code);
/* Request lookup */
if ((r = lookup_vp(0 /*flags*/, 0 /*!use_realuid*/, &vp_o)) != OK) return r;
linked_fs_e = vp_o->v_fs_e;
/* Does the final directory of 'name2' exist? */
if (fetch_name(m_in.name2, m_in.name2_length, M1) != OK) {
put_vnode(vp_o);
return(err_code);
}
/* Request lookup */
if ((r = lookup_lastdir(0 /*!use_realuid*/, &vp_d)) != OK)
{
put_vnode(vp_o);
return r;
}
link_lastdir_fs_e = vp_d->v_fs_e;
/* Check for links across devices. */
if (linked_fs_e != link_lastdir_fs_e)
{
put_vnode(vp_o);
put_vnode(vp_d);
return EXDEV;
}
/* Make sure that the object is a directory */
if ((vp_d->v_mode & I_TYPE) != I_DIRECTORY)
{
put_vnode(vp_o);
put_vnode(vp_d);
return ENOTDIR;
}
r= forbidden(vp_d, W_BIT|X_BIT, 0 /*!use_realuid*/);
if (r != OK)
{
put_vnode(vp_o);
put_vnode(vp_d);
return r;
}
/* Issue request */
r= req_link(linked_fs_e, vp_d->v_inode_nr, user_fullpath, vp_o->v_inode_nr);
put_vnode(vp_o);
put_vnode(vp_d);
return r;
}
/*===========================================================================*
* do_link *
*===========================================================================*/
int do_link()
{
/* Perform the link(name1, name2) system call. */
int r = 0;
endpoint_t linked_fs_e, link_lastdir_fs_e;
struct vnode *vp, *vp_d;
/* See if 'name1' (file to be linked to) exists. */
if(fetch_name(user_fullpath, PATH_MAX, m_in.name1) < 0) return(err_code);
if ((vp = eat_path(PATH_NOFLAGS)) == NIL_VNODE) return(err_code);
/* Does the final directory of 'name2' exist? */
if (fetch_name(user_fullpath, PATH_MAX, m_in.name2) < 0)
r = err_code;
else if ((vp_d = last_dir()) == NIL_VNODE)
r = err_code;
if (r != 0) {
put_vnode(vp);
return(r);
}
/* Check for links across devices. */
if(vp->v_fs_e != vp_d->v_fs_e)
r = -EXDEV;
else
r = forbidden(vp_d, W_BIT | X_BIT);
if (r == 0)
r = req_link(vp->v_fs_e, vp_d->v_inode_nr, user_fullpath,
vp->v_inode_nr);
put_vnode(vp);
put_vnode(vp_d);
return(r);
}
/*===========================================================================*
* do_link *
*===========================================================================*/
int do_link()
{
/* Perform the link(name1, name2) system call. */
int r = OK;
struct vnode *vp = NULL, *dirp = NULL;
struct vmnt *vmp1 = NULL, *vmp2 = NULL;
char fullpath[PATH_MAX];
struct lookup resolve;
vir_bytes vname1, vname2;
size_t vname1_length, vname2_length;
vname1 = (vir_bytes) job_m_in.name1;
vname1_length = job_m_in.name1_length;
vname2 = (vir_bytes) job_m_in.name2;
vname2_length = job_m_in.name2_length;
lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp1, &vp);
resolve.l_vmnt_lock = VMNT_WRITE;
resolve.l_vnode_lock = VNODE_READ;
/* See if 'name1' (file to be linked to) exists. */
if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
/* Does the final directory of 'name2' exist? */
lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp2, &dirp);
resolve.l_vmnt_lock = VMNT_READ;
resolve.l_vnode_lock = VNODE_WRITE;
if (fetch_name(vname2, vname2_length, fullpath) != OK)
r = err_code;
else if ((dirp = last_dir(&resolve, fp)) == NULL)
r = err_code;
if (r != OK) {
unlock_vnode(vp);
unlock_vmnt(vmp1);
put_vnode(vp);
return(r);
}
/* Check for links across devices. */
if (vp->v_fs_e != dirp->v_fs_e)
r = EXDEV;
else
r = forbidden(fp, dirp, W_BIT | X_BIT);
if (r == OK)
r = req_link(vp->v_fs_e, dirp->v_inode_nr, fullpath,
vp->v_inode_nr);
unlock_vnode(vp);
unlock_vnode(dirp);
if (vmp2 != NULL) unlock_vmnt(vmp2);
unlock_vmnt(vmp1);
put_vnode(vp);
put_vnode(dirp);
return(r);
}
