NetBSD/lib/libquota/quota_kernel.c

352 lines
8.5 KiB
C

/* $NetBSD: quota_kernel.c,v 1.6 2014/06/28 22:27:50 dholland Exp $ */
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David A. Holland.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: quota_kernel.c,v 1.6 2014/06/28 22:27:50 dholland Exp $");
#include <stdlib.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <quota.h>
#include <sys/quotactl.h>
#include "quotapvt.h"
struct kernel_quotacursor {
/* just wrap the kernel interface type */
struct quotakcursor kcursor;
};
static int
__quota_kernel_stat(struct quotahandle *qh, struct quotastat *stat)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_STAT;
args.u.stat.qc_info = stat;
return __quotactl(qh->qh_mountpoint, &args);
}
const char *
__quota_kernel_getimplname(struct quotahandle *qh)
{
static struct quotastat stat;
if (__quota_kernel_stat(qh, &stat)) {
return NULL;
}
return stat.qs_implname;
}
unsigned
__quota_kernel_getrestrictions(struct quotahandle *qh)
{
struct quotastat stat;
if (__quota_kernel_stat(qh, &stat)) {
/* XXX no particularly satisfactory thing to do here */
return 0;
}
return stat.qs_restrictions;
}
int
__quota_kernel_getnumidtypes(struct quotahandle *qh)
{
struct quotastat stat;
if (__quota_kernel_stat(qh, &stat)) {
return 0;
}
return stat.qs_numidtypes;
}
const char *
__quota_kernel_idtype_getname(struct quotahandle *qh, int idtype)
{
static struct quotaidtypestat stat;
struct quotactl_args args;
args.qc_op = QUOTACTL_IDTYPESTAT;
args.u.idtypestat.qc_idtype = idtype;
args.u.idtypestat.qc_info = &stat;
if (__quotactl(qh->qh_mountpoint, &args)) {
return NULL;
}
return stat.qis_name;
}
int
__quota_kernel_getnumobjtypes(struct quotahandle *qh)
{
struct quotastat stat;
if (__quota_kernel_stat(qh, &stat)) {
return 0;
}
return stat.qs_numobjtypes;
}
const char *
__quota_kernel_objtype_getname(struct quotahandle *qh, int objtype)
{
static struct quotaobjtypestat stat;
struct quotactl_args args;
args.qc_op = QUOTACTL_OBJTYPESTAT;
args.u.objtypestat.qc_objtype = objtype;
args.u.objtypestat.qc_info = &stat;
if (__quotactl(qh->qh_mountpoint, &args)) {
return NULL;
}
return stat.qos_name;
}
int
__quota_kernel_objtype_isbytes(struct quotahandle *qh, int objtype)
{
struct quotaobjtypestat stat;
struct quotactl_args args;
args.qc_op = QUOTACTL_OBJTYPESTAT;
args.u.objtypestat.qc_objtype = objtype;
args.u.objtypestat.qc_info = &stat;
if (__quotactl(qh->qh_mountpoint, &args)) {
return 0;
}
return stat.qos_isbytes;
}
int
__quota_kernel_quotaon(struct quotahandle *qh, int idtype)
{
struct quotactl_args args;
const char *file;
char path[PATH_MAX];
/*
* Note that while it is an error to call quotaon on something
* that isn't a volume with old-style quotas that expects
* quotaon to be called, it's not our responsibility to check
* for that; the filesystem will. Also note that it is not an
* error to call quotaon repeatedly -- apparently this is to
* permit changing the quota file in use on the fly or
* something. So all we need to do here is ask the oldfiles
* code if the mount option was set in fstab and fetch back
* the filename.
*/
file = __quota_oldfiles_getquotafile(qh, idtype, path, sizeof(path));
if (file == NULL) {
/*
* This idtype (or maybe any idtype) was not enabled
* in fstab.
*/
errno = ENXIO;
return -1;
}
args.qc_op = QUOTACTL_QUOTAON;
args.u.quotaon.qc_idtype = idtype;
args.u.quotaon.qc_quotafile = file;
return __quotactl(qh->qh_mountpoint, &args);
}
int
__quota_kernel_quotaoff(struct quotahandle *qh, int idtype)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_QUOTAOFF;
args.u.quotaoff.qc_idtype = idtype;
return __quotactl(qh->qh_mountpoint, &args);
}
int
__quota_kernel_get(struct quotahandle *qh, const struct quotakey *qk,
struct quotaval *qv)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_GET;
args.u.get.qc_key = qk;
args.u.get.qc_val = qv;
return __quotactl(qh->qh_mountpoint, &args);
}
int
__quota_kernel_put(struct quotahandle *qh, const struct quotakey *qk,
const struct quotaval *qv)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_PUT;
args.u.put.qc_key = qk;
args.u.put.qc_val = qv;
return __quotactl(qh->qh_mountpoint, &args);
}
int
__quota_kernel_delete(struct quotahandle *qh, const struct quotakey *qk)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_DEL;
args.u.del.qc_key = qk;
return __quotactl(qh->qh_mountpoint, &args);
}
struct kernel_quotacursor *
__quota_kernel_cursor_create(struct quotahandle *qh)
{
struct quotactl_args args;
struct kernel_quotacursor *cursor;
int sverrno;
cursor = malloc(sizeof(*cursor));
if (cursor == NULL) {
return NULL;
}
args.qc_op = QUOTACTL_CURSOROPEN;
args.u.cursoropen.qc_cursor = &cursor->kcursor;
if (__quotactl(qh->qh_mountpoint, &args)) {
sverrno = errno;
free(cursor);
errno = sverrno;
return NULL;
}
return cursor;
}
void
__quota_kernel_cursor_destroy(struct quotahandle *qh,
struct kernel_quotacursor *cursor)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_CURSORCLOSE;
args.u.cursorclose.qc_cursor = &cursor->kcursor;
if (__quotactl(qh->qh_mountpoint, &args)) {
/* XXX should we really print from inside the library? */
warn("__quotactl cursorclose");
}
free(cursor);
}
int
__quota_kernel_cursor_skipidtype(struct quotahandle *qh,
struct kernel_quotacursor *cursor,
int idtype)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_CURSORSKIPIDTYPE;
args.u.cursorskipidtype.qc_cursor = &cursor->kcursor;
args.u.cursorskipidtype.qc_idtype = idtype;
return __quotactl(qh->qh_mountpoint, &args);
}
int
__quota_kernel_cursor_get(struct quotahandle *qh,
struct kernel_quotacursor *cursor,
struct quotakey *key, struct quotaval *val)
{
int ret;
ret = __quota_kernel_cursor_getn(qh, cursor, key, val, 1);
if (ret < 0) {
return -1;
}
return 0;
}
int
__quota_kernel_cursor_getn(struct quotahandle *qh,
struct kernel_quotacursor *cursor,
struct quotakey *keys, struct quotaval *vals,
unsigned maxnum)
{
struct quotactl_args args;
unsigned ret;
if (maxnum > INT_MAX) {
/* joker, eh? */
errno = EINVAL;
return -1;
}
args.qc_op = QUOTACTL_CURSORGET;
args.u.cursorget.qc_cursor = &cursor->kcursor;
args.u.cursorget.qc_keys = keys;
args.u.cursorget.qc_vals = vals;
args.u.cursorget.qc_maxnum = maxnum;
args.u.cursorget.qc_ret = &ret;
if (__quotactl(qh->qh_mountpoint, &args) < 0) {
return -1;
}
return ret;
}
int
__quota_kernel_cursor_atend(struct quotahandle *qh,
struct kernel_quotacursor *cursor)
{
struct quotactl_args args;
int ret;
args.qc_op = QUOTACTL_CURSORATEND;
args.u.cursoratend.qc_cursor = &cursor->kcursor;
args.u.cursoratend.qc_ret = &ret;
if (__quotactl(qh->qh_mountpoint, &args)) {
/*
* Return -1 so naive callers, who test for the return
* value being nonzero, stop iterating, and
* sophisticated callers can tell an error from
* end-of-data.
*/
return -1;
}
return ret;
}
int
__quota_kernel_cursor_rewind(struct quotahandle *qh,
struct kernel_quotacursor *cursor)
{
struct quotactl_args args;
args.qc_op = QUOTACTL_CURSORREWIND;
args.u.cursorrewind.qc_cursor = &cursor->kcursor;
return __quotactl(qh->qh_mountpoint, &args);
}