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rump_vfs.c revision 1.92 
      1 /*	$NetBSD: rump_vfs.c,v 1.92 2020/04/20 21:39:05 ad Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by the
      7  * Finnish Cultural Foundation.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: rump_vfs.c,v 1.92 2020/04/20 21:39:05 ad Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/buf.h>
     36 #include <sys/conf.h>
     37 #include <sys/evcnt.h>
     38 #include <sys/fcntl.h>
     39 #include <sys/filedesc.h>
     40 #include <sys/fstrans.h>
     41 #include <sys/lockf.h>
     42 #include <sys/kthread.h>
     43 #include <sys/module.h>
     44 #include <sys/namei.h>
     45 #include <sys/queue.h>
     46 #include <sys/stat.h>
     47 #include <sys/vfs_syscalls.h>
     48 #include <sys/vnode.h>
     49 #include <sys/wapbl.h>
     50 #include <sys/bufq.h>
     51 
     52 #include <miscfs/specfs/specdev.h>
     53 
     54 #include <rump-sys/kern.h>
     55 #include <rump-sys/vfs.h>
     56 
     57 #include <rump/rump.h>
     58 #include <rump/rumpuser.h>
     59 
     60 extern struct cwdinfo cwdi0;
     61 const char *rootfstype = ROOT_FSTYPE_ANY;
     62 
     63 static void
     64 pvfs_init(struct proc *p)
     65 {
     66 
     67 	p->p_cwdi = cwdinit();
     68 }
     69 
     70 static void
     71 pvfs_rele(struct proc *p)
     72 {
     73 
     74 	cwdfree(p->p_cwdi);
     75 }
     76 
     77 static void
     78 fini(void)
     79 {
     80 
     81 	vfs_shutdown();
     82 	rumpblk_fini();
     83 }
     84 
     85 static void
     86 drainbufs(int npages)
     87 {
     88 
     89 	mutex_enter(&bufcache_lock);
     90 	buf_drain(npages);
     91 	mutex_exit(&bufcache_lock);
     92 }
     93 
     94 RUMP_COMPONENT(RUMP__FACTION_VFS)
     95 {
     96 	extern struct vfsops rumpfs_vfsops;
     97 	char buf[64];
     98 	char *mbase;
     99 	int rv, i;
    100 
    101 	/* initialize indirect interfaces */
    102 	rump_vfs_fini = fini;
    103 	rump_vfs_drainbufs = drainbufs;
    104 
    105 	if (rumpuser_getparam("RUMP_NVNODES", buf, sizeof(buf)) == 0) {
    106 		desiredvnodes = strtoul(buf, NULL, 10);
    107 	} else {
    108 		desiredvnodes = 1<<10;
    109 	}
    110 
    111 	rumpblk_init();
    112 
    113 	for (i = 0; i < ncpu; i++) {
    114 		struct cpu_info *ci = cpu_lookup(i);
    115 		cache_cpu_init(ci);
    116 	}
    117 
    118 	/* make number of bufpages 5% of total memory limit */
    119 	if (rump_physmemlimit != RUMPMEM_UNLIMITED) {
    120 		extern u_int bufpages;
    121 		bufpages = rump_physmemlimit / (20 * PAGE_SIZE);
    122 	}
    123 
    124 	bufq_init();
    125 	fstrans_init();
    126 	vfsinit();
    127 	bufinit();
    128 	cwd_sys_init();
    129 	lf_init();
    130 	spec_init();
    131 
    132 	root_device = &rump_rootdev;
    133 
    134 	/* bootstrap cwdi (rest done in vfs_mountroot() */
    135 	proc0.p_cwdi = &cwdi0;
    136 	proc0.p_cwdi = cwdinit();
    137 
    138 	vfs_attach(&rumpfs_vfsops);
    139 	vfs_mountroot();
    140 
    141 	/* "mtree": create /dev and /tmp */
    142 	do_sys_mkdir("/dev", 0755, UIO_SYSSPACE);
    143 	do_sys_mkdir("/tmp", 01777, UIO_SYSSPACE);
    144 	do_sys_chmodat(curlwp, AT_FDCWD, "/tmp", 01777, 0);
    145 
    146 	rump_proc_vfs_init = pvfs_init;
    147 	rump_proc_vfs_release = pvfs_rele;
    148 
    149 	if (rump_threads) {
    150 		if ((rv = kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL,
    151 		    sched_sync, NULL, NULL, "ioflush")) != 0)
    152 			panic("syncer thread create failed: %d", rv);
    153 	} else {
    154 		syncdelay = 0;
    155 	}
    156 
    157 	/*
    158 	 * On archs where the native kernel ABI is supported, map
    159 	 * host module directory to rump.  This means that kernel
    160 	 * modules from the host will be autoloaded to rump kernels.
    161 	 */
    162 	if (rump_nativeabi_p()) {
    163 		if (rumpuser_getparam("RUMP_MODULEBASE", buf, sizeof(buf)) == 0)
    164 			mbase = buf;
    165 		else
    166 			mbase = module_base;
    167 
    168 		if (strlen(mbase) != 0 && *mbase != '0') {
    169 			rump_etfs_register(module_base, mbase,
    170 			    RUMP_ETFS_DIR_SUBDIRS);
    171 		}
    172 	}
    173 
    174 	module_init_class(MODULE_CLASS_BUFQ);
    175 	module_init_class(MODULE_CLASS_VFS);
    176 
    177 	/*
    178 	 * Don't build device names for a large set of devices by
    179 	 * default.  While the pseudo-devfs is a fun experiment,
    180 	 * creating many many device nodes may increase rump kernel
    181 	 * bootstrap time by ~40%.  Device nodes should be created
    182 	 * per-demand in the component constructors.
    183 	 */
    184 #if 0
    185 	{
    186 	extern struct devsw_conv devsw_conv0[];
    187 	extern int max_devsw_convs;
    188 	rump_vfs_builddevs(devsw_conv0, max_devsw_convs);
    189 	}
    190 #else
    191 	rump_vfs_builddevs(NULL, 0);
    192 #endif
    193 
    194 	/* attach null device and create /dev/{null,zero} */
    195 	rump_devnull_init();
    196 
    197 	rump_component_init(RUMP_COMPONENT_VFS);
    198 }
    199 
    200 struct rumpcn {
    201 	struct componentname rcn_cn;
    202 	char *rcn_path;
    203 };
    204 
    205 struct componentname *
    206 rump_makecn(u_long nameiop, u_long flags, const char *name, size_t namelen,
    207 	kauth_cred_t creds, struct lwp *l)
    208 {
    209 	struct rumpcn *rcn;
    210 	struct componentname *cnp;
    211 
    212 	rcn = kmem_zalloc(sizeof(*rcn), KM_SLEEP);
    213 	cnp = &rcn->rcn_cn;
    214 
    215 	rcn->rcn_path = PNBUF_GET();
    216 	strlcpy(rcn->rcn_path, name, MAXPATHLEN);
    217 	cnp->cn_nameptr = rcn->rcn_path;
    218 
    219 	cnp->cn_nameiop = nameiop;
    220 	cnp->cn_flags = flags & (MODMASK | PARAMASK);
    221 
    222 	cnp->cn_namelen = namelen;
    223 
    224 	cnp->cn_cred = creds;
    225 
    226 	return cnp;
    227 }
    228 
    229 void
    230 rump_freecn(struct componentname *cnp, int flags)
    231 {
    232 	struct rumpcn *rcn = (void *)cnp;
    233 
    234 	if (flags & RUMPCN_FREECRED)
    235 		rump_cred_put(cnp->cn_cred);
    236 
    237 	PNBUF_PUT(rcn->rcn_path);
    238 	kmem_free(rcn, sizeof(*rcn));
    239 }
    240 
    241 /* hey baby, what's your namei? */
    242 int
    243 rump_namei(uint32_t op, uint32_t flags, const char *namep,
    244 	struct vnode **dvpp, struct vnode **vpp, struct componentname **cnpp)
    245 {
    246 	struct pathbuf *pb;
    247 	struct nameidata nd;
    248 	int rv;
    249 
    250 	pb = pathbuf_create(namep);
    251 	if (pb == NULL) {
    252 		return ENOMEM;
    253 	}
    254 	NDINIT(&nd, op, flags, pb);
    255 	rv = namei(&nd);
    256 	if (rv) {
    257 		pathbuf_destroy(pb);
    258 		return rv;
    259 	}
    260 
    261 	if (dvpp) {
    262 		KASSERT(flags & LOCKPARENT);
    263 		*dvpp = nd.ni_dvp;
    264 	} else {
    265 		KASSERT((flags & LOCKPARENT) == 0);
    266 	}
    267 
    268 	if (vpp) {
    269 		*vpp = nd.ni_vp;
    270 	} else {
    271 		if (nd.ni_vp) {
    272 			if (flags & LOCKLEAF)
    273 				vput(nd.ni_vp);
    274 			else
    275 				vrele(nd.ni_vp);
    276 		}
    277 	}
    278 
    279 	if (cnpp) {
    280 		struct componentname *cnp;
    281 
    282 		cnp = kmem_alloc(sizeof(*cnp), KM_SLEEP);
    283 		memcpy(cnp, &nd.ni_cnd, sizeof(*cnp));
    284 		*cnpp = cnp;
    285 	}
    286 	pathbuf_destroy(pb);
    287 
    288 	return rv;
    289 }
    290 
    291 void
    292 rump_getvninfo(struct vnode *vp, enum rump_vtype *vtype,
    293 	voff_t *vsize, dev_t *vdev)
    294 {
    295 
    296 	*vtype = (enum rump_vtype)vp->v_type;
    297 	*vsize = vp->v_size;
    298 	if (vp->v_specnode)
    299 		*vdev = vp->v_rdev;
    300 	else
    301 		*vdev = 0;
    302 }
    303 
    304 struct vfsops *
    305 rump_vfslist_iterate(struct vfsops *ops)
    306 {
    307 
    308 	if (ops == NULL)
    309 		return LIST_FIRST(&vfs_list);
    310 	else
    311 		return LIST_NEXT(ops, vfs_list);
    312 }
    313 
    314 struct vfsops *
    315 rump_vfs_getopsbyname(const char *name)
    316 {
    317 
    318 	return vfs_getopsbyname(name);
    319 }
    320 
    321 int
    322 rump_vfs_getmp(const char *path, struct mount **mpp)
    323 {
    324 	struct vnode *vp;
    325 	int rv;
    326 
    327 	if ((rv = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp)) != 0)
    328 		return rv;
    329 
    330 	*mpp = vp->v_mount;
    331 	vrele(vp);
    332 	return 0;
    333 }
    334 
    335 struct vattr*
    336 rump_vattr_init(void)
    337 {
    338 	struct vattr *vap;
    339 
    340 	vap = kmem_alloc(sizeof(struct vattr), KM_SLEEP);
    341 	vattr_null(vap);
    342 
    343 	return vap;
    344 }
    345 
    346 void
    347 rump_vattr_settype(struct vattr *vap, enum rump_vtype vt)
    348 {
    349 
    350 	vap->va_type = (enum vtype)vt;
    351 }
    352 
    353 void
    354 rump_vattr_setmode(struct vattr *vap, mode_t mode)
    355 {
    356 
    357 	vap->va_mode = mode;
    358 }
    359 
    360 void
    361 rump_vattr_setrdev(struct vattr *vap, dev_t dev)
    362 {
    363 
    364 	vap->va_rdev = dev;
    365 }
    366 
    367 void
    368 rump_vattr_free(struct vattr *vap)
    369 {
    370 
    371 	kmem_free(vap, sizeof(*vap));
    372 }
    373 
    374 void
    375 rump_vp_incref(struct vnode *vp)
    376 {
    377 
    378 	vref(vp);
    379 }
    380 
    381 int
    382 rump_vp_getref(struct vnode *vp)
    383 {
    384 
    385 	return vrefcnt(vp);
    386 }
    387 
    388 void
    389 rump_vp_rele(struct vnode *vp)
    390 {
    391 
    392 	vrele(vp);
    393 }
    394 
    395 void
    396 rump_vp_interlock(struct vnode *vp)
    397 {
    398 
    399 	mutex_enter(vp->v_interlock);
    400 }
    401 
    402 void
    403 rump_vp_vmobjlock(struct vnode *vp, int write)
    404 {
    405 
    406 	rw_enter(vp->v_uobj.vmobjlock, write ? RW_WRITER : RW_READER);
    407 }
    408 
    409 int
    410 rump_vfs_unmount(struct mount *mp, int mntflags)
    411 {
    412 
    413 	return VFS_UNMOUNT(mp, mntflags);
    414 }
    415 
    416 int
    417 rump_vfs_root(struct mount *mp, struct vnode **vpp, int lock)
    418 {
    419 	int rv;
    420 
    421 	rv = VFS_ROOT(mp, LK_EXCLUSIVE, vpp);
    422 	if (rv)
    423 		return rv;
    424 
    425 	if (!lock)
    426 		VOP_UNLOCK(*vpp);
    427 
    428 	return 0;
    429 }
    430 
    431 int
    432 rump_vfs_statvfs(struct mount *mp, struct statvfs *sbp)
    433 {
    434 
    435 	return VFS_STATVFS(mp, sbp);
    436 }
    437 
    438 int
    439 rump_vfs_sync(struct mount *mp, int wait, kauth_cred_t cred)
    440 {
    441 
    442 	return VFS_SYNC(mp, wait ? MNT_WAIT : MNT_NOWAIT, cred);
    443 }
    444 
    445 int
    446 rump_vfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
    447 {
    448 
    449 	return VFS_FHTOVP(mp, fid, LK_EXCLUSIVE, vpp);
    450 }
    451 
    452 int
    453 rump_vfs_vptofh(struct vnode *vp, struct fid *fid, size_t *fidsize)
    454 {
    455 
    456 	return VFS_VPTOFH(vp, fid, fidsize);
    457 }
    458 
    459 int
    460 rump_vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
    461 	int attrnamespace, const char *attrname)
    462 {
    463 
    464 	return VFS_EXTATTRCTL(mp, cmd, vp, attrnamespace, attrname);
    465 }
    466 
    467 /*ARGSUSED*/
    468 void
    469 rump_vfs_syncwait(struct mount *mp)
    470 {
    471 	int n;
    472 
    473 	n = vfs_syncwait();
    474 	if (n)
    475 		printf("syncwait: unsynced buffers: %d\n", n);
    476 }
    477 
    478 /*
    479  * Dump info about mount point.  No locking.
    480  */
    481 static bool
    482 rump_print_selector(void *cl, struct vnode *vp)
    483 {
    484 	int *full = cl;
    485 
    486 	KASSERT(mutex_owned(vp->v_interlock));
    487 
    488 	vfs_vnode_print(vp, *full, (void *)rumpuser_dprintf);
    489 	return false;
    490 }
    491 
    492 void
    493 rump_vfs_mount_print(const char *path, int full)
    494 {
    495 #ifdef DEBUGPRINT
    496 	struct vnode *mvp;
    497 	struct vnode_iterator *marker;
    498 	int error;
    499 
    500 	rumpuser_dprintf("\n==== dumping mountpoint at ``%s'' ====\n\n", path);
    501 	if ((error = namei_simple_user(path, NSM_FOLLOW_NOEMULROOT, &mvp))!=0) {
    502 		rumpuser_dprintf("==== lookup error %d ====\n\n", error);
    503 		return;
    504 	}
    505 	vfs_mount_print(mvp->v_mount, full, (void *)rumpuser_dprintf);
    506 	if (full) {
    507 		rumpuser_dprintf("\n== dumping vnodes ==\n\n");
    508 		vfs_vnode_iterator_init(mvp->v_mount, &marker);
    509 		vfs_vnode_iterator_next(marker, rump_print_selector, &full);
    510 		vfs_vnode_iterator_destroy(marker);
    511 	}
    512 	vrele(mvp);
    513 	rumpuser_dprintf("\n==== done ====\n\n");
    514 #else
    515 	rumpuser_dprintf("mount dump not supported without DEBUGPRINT\n");
    516 #endif
    517 }
    518 
    519 void
    520 rump_biodone(void *arg, size_t count, int error)
    521 {
    522 	struct buf *bp = arg;
    523 
    524 	bp->b_resid = bp->b_bcount - count;
    525 	KASSERT(bp->b_resid >= 0);
    526 	bp->b_error = error;
    527 
    528 	biodone(bp);
    529 }
    530