Home | History | Annotate | Line # | Download | only in common
vfs_syscalls_20.c revision 1.25.6.1
      1  1.25.6.1       mjf /*	$NetBSD: vfs_syscalls_20.c,v 1.25.6.1 2008/04/03 12:42:31 mjf Exp $	*/
      2       1.1  christos 
      3       1.1  christos /*
      4       1.1  christos  * Copyright (c) 1989, 1993
      5       1.1  christos  *	The Regents of the University of California.  All rights reserved.
      6       1.1  christos  * (c) UNIX System Laboratories, Inc.
      7       1.1  christos  * All or some portions of this file are derived from material licensed
      8       1.1  christos  * to the University of California by American Telephone and Telegraph
      9       1.1  christos  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     10       1.1  christos  * the permission of UNIX System Laboratories, Inc.
     11       1.1  christos  *
     12       1.1  christos  * Redistribution and use in source and binary forms, with or without
     13       1.1  christos  * modification, are permitted provided that the following conditions
     14       1.1  christos  * are met:
     15       1.1  christos  * 1. Redistributions of source code must retain the above copyright
     16       1.1  christos  *    notice, this list of conditions and the following disclaimer.
     17       1.1  christos  * 2. Redistributions in binary form must reproduce the above copyright
     18       1.1  christos  *    notice, this list of conditions and the following disclaimer in the
     19       1.1  christos  *    documentation and/or other materials provided with the distribution.
     20       1.1  christos  * 3. Neither the name of the University nor the names of its contributors
     21       1.1  christos  *    may be used to endorse or promote products derived from this software
     22       1.1  christos  *    without specific prior written permission.
     23       1.1  christos  *
     24       1.1  christos  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25       1.1  christos  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26       1.1  christos  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27       1.1  christos  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28       1.1  christos  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29       1.1  christos  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30       1.1  christos  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31       1.1  christos  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32       1.1  christos  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33       1.1  christos  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34       1.1  christos  * SUCH DAMAGE.
     35       1.1  christos  *
     36       1.1  christos  *	@(#)vfs_syscalls.c	8.42 (Berkeley) 7/31/95
     37       1.1  christos  */
     38       1.1  christos 
     39       1.1  christos #include <sys/cdefs.h>
     40  1.25.6.1       mjf __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.25.6.1 2008/04/03 12:42:31 mjf Exp $");
     41       1.1  christos 
     42       1.1  christos #include "opt_compat_netbsd.h"
     43       1.1  christos #include "opt_compat_43.h"
     44       1.1  christos #include "fss.h"
     45       1.1  christos 
     46       1.1  christos #include <sys/param.h>
     47       1.1  christos #include <sys/systm.h>
     48       1.1  christos #include <sys/namei.h>
     49       1.1  christos #include <sys/filedesc.h>
     50       1.1  christos #include <sys/kernel.h>
     51       1.1  christos #include <sys/file.h>
     52       1.1  christos #include <sys/stat.h>
     53       1.1  christos #include <sys/vnode.h>
     54       1.1  christos #include <sys/mount.h>
     55       1.1  christos #include <sys/proc.h>
     56       1.1  christos #include <sys/uio.h>
     57       1.1  christos #include <sys/malloc.h>
     58       1.1  christos #include <sys/dirent.h>
     59       1.1  christos #include <sys/sysctl.h>
     60       1.1  christos #include <sys/syscallargs.h>
     61       1.8      elad #include <sys/kauth.h>
     62       1.1  christos 
     63       1.5  christos #include <compat/sys/mount.h>
     64       1.5  christos 
     65       1.1  christos #ifdef COMPAT_09
     66       1.1  christos #define MOUNTNO_NONE	0
     67       1.1  christos #define MOUNTNO_UFS	1		/* UNIX "Fast" Filesystem */
     68       1.1  christos #define MOUNTNO_NFS	2		/* Network Filesystem */
     69       1.1  christos #define MOUNTNO_MFS	3		/* Memory Filesystem */
     70       1.1  christos #define MOUNTNO_MSDOS	4		/* MSDOS Filesystem */
     71       1.1  christos #define MOUNTNO_CD9660	5		/* iso9660 cdrom */
     72       1.1  christos #define MOUNTNO_FDESC	6		/* /dev/fd filesystem */
     73       1.4     perry #define MOUNTNO_KERNFS	7		/* kernel variable filesystem */
     74       1.1  christos #define MOUNTNO_DEVFS	8		/* device node filesystem */
     75       1.1  christos #define MOUNTNO_AFS	9		/* AFS 3.x */
     76       1.1  christos static const struct {
     77       1.1  christos 	const char *name;
     78       1.1  christos 	const int value;
     79       1.1  christos } nv[] = {
     80       1.1  christos 	{ MOUNT_UFS, MOUNTNO_UFS },
     81       1.1  christos 	{ MOUNT_NFS, MOUNTNO_NFS },
     82       1.1  christos 	{ MOUNT_MFS, MOUNTNO_MFS },
     83       1.1  christos 	{ MOUNT_MSDOS, MOUNTNO_MSDOS },
     84       1.1  christos 	{ MOUNT_CD9660, MOUNTNO_CD9660 },
     85       1.1  christos 	{ MOUNT_FDESC, MOUNTNO_FDESC },
     86       1.1  christos 	{ MOUNT_KERNFS, MOUNTNO_KERNFS },
     87       1.1  christos 	{ MOUNT_AFS, MOUNTNO_AFS },
     88       1.1  christos };
     89       1.1  christos #endif
     90       1.1  christos 
     91       1.1  christos static int
     92       1.4     perry vfs2fs(struct statfs12 *bfs, const struct statvfs *fs)
     93       1.1  christos {
     94       1.1  christos 	struct statfs12 ofs;
     95       1.1  christos #ifdef COMPAT_09
     96       1.1  christos 	int i = 0;
     97       1.1  christos 	ofs.f_type = 0;
     98       1.1  christos 	ofs.f_oflags = (short)fs->f_flag;
     99       1.1  christos 
    100       1.1  christos 	for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) {
    101       1.1  christos 		if (strcmp(nv[i].name, fs->f_fstypename) == 0) {
    102       1.1  christos 			ofs.f_type = nv[i].value;
    103       1.1  christos 			break;
    104       1.1  christos 		}
    105       1.1  christos 	}
    106       1.1  christos #else
    107       1.1  christos 	ofs.f_type = 0;
    108       1.1  christos #endif
    109       1.1  christos #define CLAMP(a)	(long)(((a) & ~LONG_MAX) ? LONG_MAX : (a))
    110       1.1  christos 	ofs.f_bsize = CLAMP(fs->f_frsize);
    111       1.1  christos 	ofs.f_iosize = CLAMP(fs->f_iosize);
    112       1.1  christos 	ofs.f_blocks = CLAMP(fs->f_blocks);
    113       1.1  christos 	ofs.f_bfree = CLAMP(fs->f_bfree);
    114       1.1  christos 	if (fs->f_bfree > fs->f_bresvd)
    115       1.1  christos 		ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd);
    116       1.1  christos 	else
    117       1.1  christos 		ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree);
    118       1.1  christos 	ofs.f_files = CLAMP(fs->f_files);
    119       1.1  christos 	ofs.f_ffree = CLAMP(fs->f_ffree);
    120       1.1  christos 	ofs.f_fsid = fs->f_fsidx;
    121       1.1  christos 	ofs.f_owner = fs->f_owner;
    122       1.1  christos 	ofs.f_flags = (long)fs->f_flag;
    123       1.1  christos 	ofs.f_syncwrites = CLAMP(fs->f_syncwrites);
    124       1.1  christos 	ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites);
    125       1.1  christos 	(void)strncpy(ofs.f_fstypename, fs->f_fstypename,
    126       1.1  christos 	    sizeof(ofs.f_fstypename));
    127       1.1  christos 	(void)strncpy(ofs.f_mntonname, fs->f_mntonname,
    128       1.1  christos 	    sizeof(ofs.f_mntonname));
    129       1.1  christos 	(void)strncpy(ofs.f_mntfromname, fs->f_mntfromname,
    130       1.1  christos 	    sizeof(ofs.f_mntfromname));
    131       1.1  christos 
    132       1.1  christos 	return copyout(&ofs, bfs, sizeof(ofs));
    133       1.1  christos }
    134       1.1  christos 
    135       1.1  christos /*
    136       1.1  christos  * Get filesystem statistics.
    137       1.1  christos  */
    138       1.1  christos /* ARGSUSED */
    139       1.1  christos int
    140      1.23       dsl compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
    141       1.1  christos {
    142      1.23       dsl 	/* {
    143       1.1  christos 		syscallarg(const char *) path;
    144       1.1  christos 		syscallarg(struct statfs12 *) buf;
    145      1.23       dsl 	} */
    146       1.1  christos 	struct mount *mp;
    147       1.2  christos 	struct statvfs *sbuf;
    148       1.2  christos 	int error = 0;
    149       1.1  christos 	struct nameidata nd;
    150       1.1  christos 
    151      1.22     pooka 	NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE,
    152      1.22     pooka 	    SCARG(uap, path));
    153       1.1  christos 	if ((error = namei(&nd)) != 0)
    154       1.1  christos 		return error;
    155       1.2  christos 
    156       1.1  christos 	mp = nd.ni_vp->v_mount;
    157       1.2  christos 
    158       1.2  christos 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    159       1.6  christos 	if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
    160       1.2  christos 		goto done;
    161       1.2  christos 
    162       1.3  christos 	error = vfs2fs(SCARG(uap, buf), sbuf);
    163       1.2  christos done:
    164      1.24        ad 	vrele(nd.ni_vp);
    165       1.2  christos 	free(sbuf, M_TEMP);
    166       1.2  christos 	return error;
    167       1.1  christos }
    168       1.1  christos 
    169       1.1  christos /*
    170       1.1  christos  * Get filesystem statistics.
    171       1.1  christos  */
    172       1.1  christos /* ARGSUSED */
    173       1.1  christos int
    174      1.23       dsl compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
    175       1.1  christos {
    176      1.23       dsl 	/* {
    177       1.1  christos 		syscallarg(int) fd;
    178       1.1  christos 		syscallarg(struct statfs12 *) buf;
    179      1.23       dsl 	} */
    180       1.1  christos 	struct file *fp;
    181       1.1  christos 	struct mount *mp;
    182       1.9  christos 	struct statvfs *sbuf;
    183       1.1  christos 	int error;
    184       1.1  christos 
    185       1.1  christos 	/* getvnode() will use the descriptor for us */
    186  1.25.6.1       mjf 	if ((error = getvnode(SCARG(uap, fd), &fp)) != 0)
    187       1.1  christos 		return (error);
    188       1.1  christos 	mp = ((struct vnode *)fp->f_data)->v_mount;
    189       1.9  christos 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    190       1.9  christos 	if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
    191       1.1  christos 		goto out;
    192       1.9  christos 	error = vfs2fs(SCARG(uap, buf), sbuf);
    193       1.1  christos  out:
    194  1.25.6.1       mjf 	fd_putfile(SCARG(uap, fd));
    195       1.9  christos 	free(sbuf, M_TEMP);
    196       1.1  christos 	return error;
    197       1.1  christos }
    198       1.1  christos 
    199       1.1  christos 
    200       1.1  christos /*
    201       1.1  christos  * Get statistics on all filesystems.
    202       1.1  christos  */
    203       1.1  christos int
    204      1.23       dsl compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
    205       1.1  christos {
    206      1.23       dsl 	/* {
    207       1.1  christos 		syscallarg(struct statfs12 *) buf;
    208       1.1  christos 		syscallarg(long) bufsize;
    209       1.1  christos 		syscallarg(int) flags;
    210      1.23       dsl 	} */
    211       1.1  christos 	int root = 0;
    212       1.1  christos 	struct mount *mp, *nmp;
    213       1.9  christos 	struct statvfs *sbuf;
    214       1.1  christos 	struct statfs12 *sfsp;
    215       1.1  christos 	size_t count, maxcount;
    216       1.1  christos 	int error = 0;
    217       1.1  christos 
    218      1.10  drochner 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    219       1.1  christos 	maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12);
    220       1.1  christos 	sfsp = SCARG(uap, buf);
    221      1.18        ad 	mutex_enter(&mountlist_lock);
    222       1.1  christos 	count = 0;
    223       1.1  christos 	for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
    224       1.1  christos 	     mp = nmp) {
    225      1.25        ad 		if (vfs_trybusy(mp, RW_READER, &mountlist_lock)) {
    226       1.1  christos 			nmp = CIRCLEQ_NEXT(mp, mnt_list);
    227       1.1  christos 			continue;
    228       1.1  christos 		}
    229       1.1  christos 		if (sfsp && count < maxcount) {
    230       1.9  christos 			error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0);
    231       1.1  christos 			if (error) {
    232      1.18        ad 				mutex_enter(&mountlist_lock);
    233       1.1  christos 				nmp = CIRCLEQ_NEXT(mp, mnt_list);
    234      1.25        ad 				vfs_unbusy(mp, false);
    235       1.1  christos 				continue;
    236       1.1  christos 			}
    237       1.9  christos 			error = vfs2fs(sfsp, sbuf);
    238       1.1  christos 			if (error) {
    239      1.25        ad 				vfs_unbusy(mp, false);
    240       1.9  christos 				goto out;
    241       1.1  christos 			}
    242       1.1  christos 			sfsp++;
    243       1.9  christos 			root |= strcmp(sbuf->f_mntonname, "/") == 0;
    244       1.1  christos 		}
    245       1.1  christos 		count++;
    246      1.19     oster 		mutex_enter(&mountlist_lock);
    247       1.1  christos 		nmp = CIRCLEQ_NEXT(mp, mnt_list);
    248      1.25        ad 		vfs_unbusy(mp, false);
    249       1.1  christos 	}
    250      1.18        ad 	mutex_exit(&mountlist_lock);
    251       1.6  christos 	if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) {
    252       1.1  christos 		/*
    253       1.1  christos 		 * fake a root entry
    254       1.1  christos 		 */
    255      1.10  drochner 		if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount,
    256      1.10  drochner 				       sbuf, l, SCARG(uap, flags), 1)) != 0)
    257       1.9  christos 			goto out;
    258       1.1  christos 		if (sfsp)
    259       1.9  christos 			error = vfs2fs(sfsp, sbuf);
    260       1.1  christos 		count++;
    261       1.1  christos 	}
    262       1.1  christos 	if (sfsp && count > maxcount)
    263       1.1  christos 		*retval = maxcount;
    264       1.1  christos 	else
    265       1.1  christos 		*retval = count;
    266       1.9  christos out:
    267       1.9  christos 	free(sbuf, M_TEMP);
    268       1.1  christos 	return error;
    269       1.1  christos }
    270       1.1  christos 
    271       1.1  christos int
    272      1.23       dsl compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
    273       1.1  christos {
    274      1.23       dsl 	/* {
    275      1.11    martin 		syscallarg(const struct compat_30_fhandle *) fhp;
    276       1.1  christos 		syscallarg(struct statfs12 *) buf;
    277      1.23       dsl 	} */
    278       1.9  christos 	struct statvfs *sbuf;
    279      1.11    martin 	struct compat_30_fhandle fh;
    280       1.1  christos 	struct mount *mp;
    281       1.1  christos 	struct vnode *vp;
    282       1.1  christos 	int error;
    283       1.1  christos 
    284       1.1  christos 	/*
    285       1.1  christos 	 * Must be super user
    286       1.1  christos 	 */
    287      1.14      elad 	if ((error = kauth_authorize_system(l->l_cred,
    288      1.14      elad 	    KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
    289       1.1  christos 		return (error);
    290       1.1  christos 
    291      1.11    martin 	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
    292       1.1  christos 		return (error);
    293       1.1  christos 
    294       1.1  christos 	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
    295       1.1  christos 		return (ESTALE);
    296      1.11    martin 	if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp)))
    297       1.1  christos 		return (error);
    298       1.1  christos 	mp = vp->v_mount;
    299      1.24        ad 	VOP_UNLOCK(vp, 0);
    300       1.9  christos 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    301      1.20     pooka 	if ((error = VFS_STATVFS(mp, sbuf)) != 0)
    302       1.9  christos 		goto out;
    303       1.9  christos 	error = vfs2fs(SCARG(uap, buf), sbuf);
    304       1.9  christos out:
    305      1.24        ad 	vrele(vp);
    306       1.9  christos 	free(sbuf, M_TEMP);
    307       1.9  christos 	return error;
    308       1.1  christos }
    309