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      1 /*	$NetBSD: compat_50_quota.c,v 1.4 2022/09/21 07:15:24 dholland Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: compat_50_quota.c,v 1.4 2022/09/21 07:15:24 dholland Exp $");
     33 
     34 #if defined(_KERNEL_OPT)
     35 #include "opt_compat_netbsd.h"
     36 #endif
     37 
     38 #include <sys/module.h>
     39 #include <sys/namei.h>
     40 #include <sys/param.h>
     41 #include <sys/quota.h>
     42 #include <sys/quotactl.h>
     43 #include <sys/systm.h>
     44 #include <sys/syscall.h>
     45 #include <sys/syscallvar.h>
     46 #include <sys/syscallargs.h>
     47 #include <sys/vfs_syscalls.h>
     48 #include <sys/vnode.h>
     49 
     50 #include <ufs/ufs/quota1.h>
     51 
     52 static const struct syscall_package vfs_syscalls_50_quota_syscalls[] = {
     53 	{ SYS_compat_50_quotactl, 0, (sy_call_t *)compat_50_sys_quotactl },
     54 	{ 0, 0, NULL }
     55 };
     56 
     57 /* ARGSUSED */
     58 int
     59 compat_50_sys_quotactl(struct lwp *l, const struct compat_50_sys_quotactl_args *uap, register_t *retval)
     60 {
     61 	/* {
     62 		syscallarg(const char *) path;
     63 		syscallarg(int) cmd;
     64 		syscallarg(int) uid;
     65 		syscallarg(void *) arg;
     66 	} */
     67 	struct vnode *vp;
     68 	struct mount *mp;
     69 	int q1cmd;
     70 	int idtype;
     71 	char *qfile;
     72 	struct dqblk dqblk;
     73 	struct quotakey key;
     74 	struct quotaval blocks, files;
     75 	struct quotastat qstat;
     76 	int error;
     77 
     78 	error = namei_simple_user(SCARG(uap, path),
     79 				NSM_FOLLOW_TRYEMULROOT, &vp);
     80 	if (error != 0)
     81 		return (error);
     82 
     83 	mp = vp->v_mount;
     84 	q1cmd = SCARG(uap, cmd);
     85 	idtype = quota_idtype_from_ufs(q1cmd & SUBCMDMASK);
     86 	if (idtype == -1) {
     87 		return EINVAL;
     88 	}
     89 
     90 	switch ((q1cmd & ~SUBCMDMASK) >> SUBCMDSHIFT) {
     91 	case Q_QUOTAON:
     92 		qfile = PNBUF_GET();
     93 		error = copyinstr(SCARG(uap, arg), qfile, PATH_MAX, NULL);
     94 		if (error != 0) {
     95 			PNBUF_PUT(qfile);
     96 			break;
     97 		}
     98 
     99 		error = vfs_quotactl_quotaon(mp, idtype, qfile);
    100 
    101 		PNBUF_PUT(qfile);
    102 		break;
    103 
    104 	case Q_QUOTAOFF:
    105 		error = vfs_quotactl_quotaoff(mp, idtype);
    106 		break;
    107 
    108 	case Q_GETQUOTA:
    109 		key.qk_idtype = idtype;
    110 		key.qk_id = SCARG(uap, uid);
    111 
    112 		key.qk_objtype = QUOTA_OBJTYPE_BLOCKS;
    113 		error = vfs_quotactl_get(mp, &key, &blocks);
    114 		if (error) {
    115 			break;
    116 		}
    117 
    118 		key.qk_objtype = QUOTA_OBJTYPE_FILES;
    119 		error = vfs_quotactl_get(mp, &key, &files);
    120 		if (error) {
    121 			break;
    122 		}
    123 
    124 		quotavals_to_dqblk(&blocks, &files, &dqblk);
    125 		error = copyout(&dqblk, SCARG(uap, arg), sizeof(dqblk));
    126 		break;
    127 
    128 	case Q_SETQUOTA:
    129 		error = copyin(SCARG(uap, arg), &dqblk, sizeof(dqblk));
    130 		if (error) {
    131 			break;
    132 		}
    133 		dqblk_to_quotavals(&dqblk, &blocks, &files);
    134 
    135 		key.qk_idtype = idtype;
    136 		key.qk_id = SCARG(uap, uid);
    137 
    138 		key.qk_objtype = QUOTA_OBJTYPE_BLOCKS;
    139 		error = vfs_quotactl_put(mp, &key, &blocks);
    140 		if (error) {
    141 			break;
    142 		}
    143 
    144 		key.qk_objtype = QUOTA_OBJTYPE_FILES;
    145 		error = vfs_quotactl_put(mp, &key, &files);
    146 		break;
    147 
    148 	case Q_SYNC:
    149 		/*
    150 		 * not supported but used only to see if quota is supported,
    151 		 * emulate with stat
    152 		 *
    153 		 * XXX should probably be supported
    154 		 */
    155 		(void)idtype; /* not used */
    156 
    157 		error = vfs_quotactl_stat(mp, &qstat);
    158 		break;
    159 
    160 	case Q_SETUSE:
    161 	default:
    162 		error = EOPNOTSUPP;
    163 		break;
    164 	}
    165 
    166 	vrele(vp);
    167 	return error;
    168 }
    169 
    170 MODULE(MODULE_CLASS_EXEC, compat_50_quota, "compat_50,ufs");
    171 
    172 static int
    173 compat_50_quota_modcmd(modcmd_t cmd, void *arg)
    174 {
    175 
    176 	switch (cmd) {
    177 	case MODULE_CMD_INIT:
    178         	return syscall_establish(NULL, vfs_syscalls_50_quota_syscalls);
    179 	case MODULE_CMD_FINI:
    180         	return syscall_disestablish(NULL, vfs_syscalls_50_quota_syscalls);
    181 	default:
    182 		return ENOTTY;
    183 	}
    184 }
    185