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vfs_syscalls_20.c revision 1.35.18.1
      1  1.35.18.1       tls /*	$NetBSD: vfs_syscalls_20.c,v 1.35.18.1 2014/08/20 00:03:31 tls 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  1.35.18.1       tls __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.35.18.1 2014/08/20 00:03:31 tls Exp $");
     41        1.1  christos 
     42       1.32        ad #ifdef _KERNEL_OPT
     43        1.1  christos #include "opt_compat_netbsd.h"
     44       1.32        ad #endif
     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 #define MOUNTNO_NONE	0
     66        1.1  christos #define MOUNTNO_UFS	1		/* UNIX "Fast" Filesystem */
     67        1.1  christos #define MOUNTNO_NFS	2		/* Network Filesystem */
     68        1.1  christos #define MOUNTNO_MFS	3		/* Memory Filesystem */
     69        1.1  christos #define MOUNTNO_MSDOS	4		/* MSDOS Filesystem */
     70        1.1  christos #define MOUNTNO_CD9660	5		/* iso9660 cdrom */
     71        1.1  christos #define MOUNTNO_FDESC	6		/* /dev/fd filesystem */
     72        1.4     perry #define MOUNTNO_KERNFS	7		/* kernel variable filesystem */
     73        1.1  christos #define MOUNTNO_DEVFS	8		/* device node filesystem */
     74        1.1  christos #define MOUNTNO_AFS	9		/* AFS 3.x */
     75        1.1  christos static const struct {
     76        1.1  christos 	const char *name;
     77        1.1  christos 	const int value;
     78        1.1  christos } nv[] = {
     79        1.1  christos 	{ MOUNT_UFS, MOUNTNO_UFS },
     80        1.1  christos 	{ MOUNT_NFS, MOUNTNO_NFS },
     81        1.1  christos 	{ MOUNT_MFS, MOUNTNO_MFS },
     82        1.1  christos 	{ MOUNT_MSDOS, MOUNTNO_MSDOS },
     83        1.1  christos 	{ MOUNT_CD9660, MOUNTNO_CD9660 },
     84        1.1  christos 	{ MOUNT_FDESC, MOUNTNO_FDESC },
     85        1.1  christos 	{ MOUNT_KERNFS, MOUNTNO_KERNFS },
     86        1.1  christos 	{ MOUNT_AFS, MOUNTNO_AFS },
     87        1.1  christos };
     88        1.1  christos 
     89        1.1  christos static int
     90        1.4     perry vfs2fs(struct statfs12 *bfs, const struct statvfs *fs)
     91        1.1  christos {
     92        1.1  christos 	struct statfs12 ofs;
     93        1.1  christos 	int i = 0;
     94        1.1  christos 	ofs.f_type = 0;
     95        1.1  christos 	ofs.f_oflags = (short)fs->f_flag;
     96        1.1  christos 
     97        1.1  christos 	for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) {
     98        1.1  christos 		if (strcmp(nv[i].name, fs->f_fstypename) == 0) {
     99        1.1  christos 			ofs.f_type = nv[i].value;
    100        1.1  christos 			break;
    101        1.1  christos 		}
    102        1.1  christos 	}
    103        1.1  christos #define CLAMP(a)	(long)(((a) & ~LONG_MAX) ? LONG_MAX : (a))
    104        1.1  christos 	ofs.f_bsize = CLAMP(fs->f_frsize);
    105        1.1  christos 	ofs.f_iosize = CLAMP(fs->f_iosize);
    106        1.1  christos 	ofs.f_blocks = CLAMP(fs->f_blocks);
    107        1.1  christos 	ofs.f_bfree = CLAMP(fs->f_bfree);
    108        1.1  christos 	if (fs->f_bfree > fs->f_bresvd)
    109        1.1  christos 		ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd);
    110        1.1  christos 	else
    111        1.1  christos 		ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree);
    112        1.1  christos 	ofs.f_files = CLAMP(fs->f_files);
    113        1.1  christos 	ofs.f_ffree = CLAMP(fs->f_ffree);
    114        1.1  christos 	ofs.f_fsid = fs->f_fsidx;
    115        1.1  christos 	ofs.f_owner = fs->f_owner;
    116        1.1  christos 	ofs.f_flags = (long)fs->f_flag;
    117        1.1  christos 	ofs.f_syncwrites = CLAMP(fs->f_syncwrites);
    118        1.1  christos 	ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites);
    119        1.1  christos 	(void)strncpy(ofs.f_fstypename, fs->f_fstypename,
    120        1.1  christos 	    sizeof(ofs.f_fstypename));
    121        1.1  christos 	(void)strncpy(ofs.f_mntonname, fs->f_mntonname,
    122        1.1  christos 	    sizeof(ofs.f_mntonname));
    123        1.1  christos 	(void)strncpy(ofs.f_mntfromname, fs->f_mntfromname,
    124        1.1  christos 	    sizeof(ofs.f_mntfromname));
    125        1.1  christos 
    126        1.1  christos 	return copyout(&ofs, bfs, sizeof(ofs));
    127        1.1  christos }
    128        1.1  christos 
    129        1.1  christos /*
    130        1.1  christos  * Get filesystem statistics.
    131        1.1  christos  */
    132        1.1  christos /* ARGSUSED */
    133        1.1  christos int
    134       1.23       dsl compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
    135        1.1  christos {
    136       1.23       dsl 	/* {
    137        1.1  christos 		syscallarg(const char *) path;
    138        1.1  christos 		syscallarg(struct statfs12 *) buf;
    139       1.23       dsl 	} */
    140        1.1  christos 	struct mount *mp;
    141        1.2  christos 	struct statvfs *sbuf;
    142        1.2  christos 	int error = 0;
    143       1.34  dholland 	struct vnode *vp;
    144        1.1  christos 
    145       1.34  dholland 	error = namei_simple_user(SCARG(uap, path),
    146       1.34  dholland 			NSM_FOLLOW_TRYEMULROOT, &vp);
    147       1.34  dholland 	if (error != 0)
    148        1.1  christos 		return error;
    149        1.2  christos 
    150       1.34  dholland 	mp = vp->v_mount;
    151        1.2  christos 
    152        1.2  christos 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    153        1.6  christos 	if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
    154        1.2  christos 		goto done;
    155        1.2  christos 
    156        1.3  christos 	error = vfs2fs(SCARG(uap, buf), sbuf);
    157        1.2  christos done:
    158       1.34  dholland 	vrele(vp);
    159        1.2  christos 	free(sbuf, M_TEMP);
    160        1.2  christos 	return error;
    161        1.1  christos }
    162        1.1  christos 
    163        1.1  christos /*
    164        1.1  christos  * Get filesystem statistics.
    165        1.1  christos  */
    166        1.1  christos /* ARGSUSED */
    167        1.1  christos int
    168       1.23       dsl compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
    169        1.1  christos {
    170       1.23       dsl 	/* {
    171        1.1  christos 		syscallarg(int) fd;
    172        1.1  christos 		syscallarg(struct statfs12 *) buf;
    173       1.23       dsl 	} */
    174        1.1  christos 	struct file *fp;
    175        1.1  christos 	struct mount *mp;
    176        1.9  christos 	struct statvfs *sbuf;
    177        1.1  christos 	int error;
    178        1.1  christos 
    179       1.31        ad 	/* fd_getvnode() will use the descriptor for us */
    180       1.31        ad 	if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
    181        1.1  christos 		return (error);
    182        1.1  christos 	mp = ((struct vnode *)fp->f_data)->v_mount;
    183        1.9  christos 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    184        1.9  christos 	if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
    185        1.1  christos 		goto out;
    186        1.9  christos 	error = vfs2fs(SCARG(uap, buf), sbuf);
    187        1.1  christos  out:
    188       1.26        ad 	fd_putfile(SCARG(uap, fd));
    189        1.9  christos 	free(sbuf, M_TEMP);
    190        1.1  christos 	return error;
    191        1.1  christos }
    192        1.1  christos 
    193        1.1  christos 
    194        1.1  christos /*
    195        1.1  christos  * Get statistics on all filesystems.
    196        1.1  christos  */
    197        1.1  christos int
    198       1.23       dsl compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
    199        1.1  christos {
    200       1.23       dsl 	/* {
    201        1.1  christos 		syscallarg(struct statfs12 *) buf;
    202        1.1  christos 		syscallarg(long) bufsize;
    203        1.1  christos 		syscallarg(int) flags;
    204       1.23       dsl 	} */
    205        1.1  christos 	int root = 0;
    206        1.1  christos 	struct mount *mp, *nmp;
    207        1.9  christos 	struct statvfs *sbuf;
    208        1.1  christos 	struct statfs12 *sfsp;
    209        1.1  christos 	size_t count, maxcount;
    210        1.1  christos 	int error = 0;
    211        1.1  christos 
    212       1.10  drochner 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    213        1.1  christos 	maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12);
    214        1.1  christos 	sfsp = SCARG(uap, buf);
    215       1.18        ad 	mutex_enter(&mountlist_lock);
    216        1.1  christos 	count = 0;
    217  1.35.18.1       tls 	for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
    218       1.30        ad 		if (vfs_busy(mp, &nmp)) {
    219        1.1  christos 			continue;
    220        1.1  christos 		}
    221        1.1  christos 		if (sfsp && count < maxcount) {
    222        1.9  christos 			error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0);
    223        1.1  christos 			if (error) {
    224       1.28        ad 				vfs_unbusy(mp, false, &nmp);
    225        1.1  christos 				continue;
    226        1.1  christos 			}
    227        1.9  christos 			error = vfs2fs(sfsp, sbuf);
    228        1.1  christos 			if (error) {
    229       1.28        ad 				vfs_unbusy(mp, false, NULL);
    230        1.9  christos 				goto out;
    231        1.1  christos 			}
    232        1.1  christos 			sfsp++;
    233        1.9  christos 			root |= strcmp(sbuf->f_mntonname, "/") == 0;
    234        1.1  christos 		}
    235        1.1  christos 		count++;
    236       1.28        ad 		vfs_unbusy(mp, false, &nmp);
    237        1.1  christos 	}
    238       1.18        ad 	mutex_exit(&mountlist_lock);
    239        1.6  christos 	if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) {
    240        1.1  christos 		/*
    241        1.1  christos 		 * fake a root entry
    242        1.1  christos 		 */
    243       1.10  drochner 		if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount,
    244       1.10  drochner 				       sbuf, l, SCARG(uap, flags), 1)) != 0)
    245        1.9  christos 			goto out;
    246        1.1  christos 		if (sfsp)
    247        1.9  christos 			error = vfs2fs(sfsp, sbuf);
    248        1.1  christos 		count++;
    249        1.1  christos 	}
    250        1.1  christos 	if (sfsp && count > maxcount)
    251        1.1  christos 		*retval = maxcount;
    252        1.1  christos 	else
    253        1.1  christos 		*retval = count;
    254        1.9  christos out:
    255        1.9  christos 	free(sbuf, M_TEMP);
    256        1.1  christos 	return error;
    257        1.1  christos }
    258        1.1  christos 
    259        1.1  christos int
    260       1.23       dsl compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
    261        1.1  christos {
    262       1.23       dsl 	/* {
    263       1.11    martin 		syscallarg(const struct compat_30_fhandle *) fhp;
    264        1.1  christos 		syscallarg(struct statfs12 *) buf;
    265       1.23       dsl 	} */
    266        1.9  christos 	struct statvfs *sbuf;
    267       1.11    martin 	struct compat_30_fhandle fh;
    268        1.1  christos 	struct mount *mp;
    269        1.1  christos 	struct vnode *vp;
    270        1.1  christos 	int error;
    271        1.1  christos 
    272        1.1  christos 	/*
    273        1.1  christos 	 * Must be super user
    274        1.1  christos 	 */
    275       1.14      elad 	if ((error = kauth_authorize_system(l->l_cred,
    276       1.14      elad 	    KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
    277        1.1  christos 		return (error);
    278        1.1  christos 
    279       1.11    martin 	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
    280        1.1  christos 		return (error);
    281        1.1  christos 
    282        1.1  christos 	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
    283        1.1  christos 		return (ESTALE);
    284       1.11    martin 	if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp)))
    285        1.1  christos 		return (error);
    286        1.1  christos 	mp = vp->v_mount;
    287       1.35   hannken 	VOP_UNLOCK(vp);
    288        1.9  christos 	sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
    289       1.20     pooka 	if ((error = VFS_STATVFS(mp, sbuf)) != 0)
    290        1.9  christos 		goto out;
    291        1.9  christos 	error = vfs2fs(SCARG(uap, buf), sbuf);
    292        1.9  christos out:
    293       1.24        ad 	vrele(vp);
    294        1.9  christos 	free(sbuf, M_TEMP);
    295        1.9  christos 	return error;
    296        1.1  christos }
    297