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rump_vfs.c revision 1.56 
      1 /*	$NetBSD: rump_vfs.c,v 1.56 2010/06/30 15:48:59 pooka 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 1.56 2010/06/30 15:48:59 pooka 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/filedesc.h>
     39 #include <sys/fstrans.h>
     40 #include <sys/lockf.h>
     41 #include <sys/kthread.h>
     42 #include <sys/module.h>
     43 #include <sys/namei.h>
     44 #include <sys/queue.h>
     45 #include <sys/stat.h>
     46 #include <sys/vfs_syscalls.h>
     47 #include <sys/vnode.h>
     48 #include <sys/wapbl.h>
     49 
     50 #include <miscfs/specfs/specdev.h>
     51 #include <miscfs/syncfs/syncfs.h>
     52 
     53 #include <rump/rump.h>
     54 #include <rump/rumpuser.h>
     55 
     56 #include "rump_private.h"
     57 #include "rump_vfs_private.h"
     58 
     59 struct cwdinfo cwdi0;
     60 const char *rootfstype = ROOT_FSTYPE_ANY;
     61 
     62 static void rump_rcvp_lwpset(struct vnode *, struct vnode *, struct lwp *);
     63 
     64 static void
     65 pvfs_init(struct proc *p)
     66 {
     67 
     68 	p->p_cwdi = cwdinit();
     69 }
     70 
     71 static void
     72 pvfs_rele(struct proc *p)
     73 {
     74 
     75 	cwdfree(p->p_cwdi);
     76 }
     77 
     78 void
     79 rump_vfs_init(void)
     80 {
     81 	extern struct devsw_conv devsw_conv0[];
     82 	extern int max_devsw_convs;
     83 	extern struct vfsops rumpfs_vfsops;
     84 	char buf[64];
     85 	int error;
     86 	int rv, i;
     87 	extern int dovfsusermount; /* XXX */
     88 
     89 	dovfsusermount = 1; /* XXX */
     90 
     91 	if (rumpuser_getenv("RUMP_NVNODES", buf, sizeof(buf), &error) == 0) {
     92 		desiredvnodes = strtoul(buf, NULL, 10);
     93 	} else {
     94 		desiredvnodes = 1<<10;
     95 	}
     96 
     97 	rumpblk_init();
     98 
     99 	for (i = 0; i < ncpu; i++) {
    100 		struct cpu_info *ci = cpu_lookup(i);
    101 		cache_cpu_init(ci);
    102 	}
    103 	vfsinit();
    104 	bufinit();
    105 	cwd_sys_init();
    106 	lf_init();
    107 	spec_init();
    108 	fstrans_init();
    109 
    110 	if (rump_threads) {
    111 		if ((rv = kthread_create(PRI_BIO, KTHREAD_MPSAFE, NULL,
    112 		    rumpuser_biothread, rump_biodone, NULL, "rmpabio")) != 0)
    113 			panic("syncer thread create failed: %d", rv);
    114 	}
    115 
    116 	root_device = &rump_rootdev;
    117 
    118 	/* bootstrap cwdi (rest done in vfs_mountroot() */
    119 	rw_init(&cwdi0.cwdi_lock);
    120 	proc0.p_cwdi = &cwdi0;
    121 	proc0.p_cwdi = cwdinit();
    122 
    123 	vfs_attach(&rumpfs_vfsops);
    124 	vfs_mountroot();
    125 
    126 	/* "mtree": create /dev */
    127 	do_sys_mkdir("/dev", 0777, UIO_SYSSPACE);
    128 	rump_devnull_init();
    129 
    130 	rump_proc_vfs_init = pvfs_init;
    131 	rump_proc_vfs_release = pvfs_rele;
    132 
    133 	if (rump_threads) {
    134 		if ((rv = kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL,
    135 		    sched_sync, NULL, NULL, "ioflush")) != 0)
    136 			panic("syncer thread create failed: %d", rv);
    137 	} else {
    138 		syncdelay = 0;
    139 	}
    140 
    141 	/*
    142 	 * On archs where the native kernel ABI is supported, map
    143 	 * host module directory to rump.  This means that kernel
    144 	 * modules from the host will be autoloaded to rump kernels.
    145 	 */
    146 #ifdef _RUMP_NATIVE_ABI
    147 	{
    148 	char *mbase;
    149 
    150 	if (rumpuser_getenv("RUMP_MODULEBASE", buf, sizeof(buf), &error) == 0)
    151 		mbase = buf;
    152 	else
    153 		mbase = module_base;
    154 
    155 	if (strlen(mbase) != 0 && *mbase != '0') {
    156 		rump_etfs_register(module_base, mbase, RUMP_ETFS_DIR_SUBDIRS);
    157 	}
    158 	}
    159 #endif
    160 
    161 	module_init_class(MODULE_CLASS_VFS);
    162 
    163 	rump_vfs_builddevs(devsw_conv0, max_devsw_convs);
    164 
    165 	rump_component_init(RUMP_COMPONENT_VFS);
    166 }
    167 
    168 void
    169 rump_vfs_fini(void)
    170 {
    171 
    172 	vfs_shutdown();
    173 }
    174 
    175 struct componentname *
    176 rump_makecn(u_long nameiop, u_long flags, const char *name, size_t namelen,
    177 	kauth_cred_t creds, struct lwp *l)
    178 {
    179 	struct componentname *cnp;
    180 	const char *cp = NULL;
    181 
    182 	cnp = kmem_zalloc(sizeof(struct componentname), KM_SLEEP);
    183 
    184 	cnp->cn_nameiop = nameiop;
    185 	cnp->cn_flags = flags;
    186 
    187 	cnp->cn_pnbuf = PNBUF_GET();
    188 	strcpy(cnp->cn_pnbuf, name);
    189 	cnp->cn_nameptr = cnp->cn_pnbuf;
    190 	cnp->cn_namelen = namelen;
    191 	cnp->cn_hash = namei_hash(name, &cp);
    192 
    193 	cnp->cn_cred = creds;
    194 
    195 	return cnp;
    196 }
    197 
    198 void
    199 rump_freecn(struct componentname *cnp, int flags)
    200 {
    201 
    202 	if (flags & RUMPCN_FREECRED)
    203 		rump_cred_put(cnp->cn_cred);
    204 
    205 	if ((cnp->cn_flags & SAVENAME) == 0 || flags & RUMPCN_FORCEFREE)
    206 		PNBUF_PUT(cnp->cn_pnbuf);
    207 	kmem_free(cnp, sizeof(*cnp));
    208 }
    209 
    210 int
    211 rump_checksavecn(struct componentname *cnp)
    212 {
    213 
    214 	if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0) {
    215 		return 0;
    216 	} else {
    217 		cnp->cn_flags |= HASBUF;
    218 		return 1;
    219 	}
    220 }
    221 
    222 /* hey baby, what's your namei? */
    223 int
    224 rump_namei(uint32_t op, uint32_t flags, const char *namep,
    225 	struct vnode **dvpp, struct vnode **vpp, struct componentname **cnpp)
    226 {
    227 	struct nameidata nd;
    228 	int rv;
    229 
    230 	NDINIT(&nd, op, flags, UIO_SYSSPACE, namep);
    231 	rv = namei(&nd);
    232 	if (rv)
    233 		return rv;
    234 
    235 	if (dvpp) {
    236 		KASSERT(flags & LOCKPARENT);
    237 		*dvpp = nd.ni_dvp;
    238 	} else {
    239 		KASSERT((flags & LOCKPARENT) == 0);
    240 	}
    241 
    242 	if (vpp) {
    243 		*vpp = nd.ni_vp;
    244 	} else {
    245 		if (nd.ni_vp) {
    246 			if (flags & LOCKLEAF)
    247 				vput(nd.ni_vp);
    248 			else
    249 				vrele(nd.ni_vp);
    250 		}
    251 	}
    252 
    253 	if (cnpp) {
    254 		struct componentname *cnp;
    255 
    256 		cnp = kmem_alloc(sizeof(*cnp), KM_SLEEP);
    257 		memcpy(cnp, &nd.ni_cnd, sizeof(*cnp));
    258 		*cnpp = cnp;
    259 	} else if (nd.ni_cnd.cn_flags & HASBUF) {
    260 		panic("%s: pathbuf mismatch", __func__);
    261 	}
    262 
    263 	return rv;
    264 }
    265 
    266 void
    267 rump_getvninfo(struct vnode *vp, enum vtype *vtype,
    268 	voff_t *vsize, dev_t *vdev)
    269 {
    270 
    271 	*vtype = vp->v_type;
    272 	*vsize = vp->v_size;
    273 	if (vp->v_specnode)
    274 		*vdev = vp->v_rdev;
    275 	else
    276 		*vdev = 0;
    277 }
    278 
    279 struct vfsops *
    280 rump_vfslist_iterate(struct vfsops *ops)
    281 {
    282 
    283 	if (ops == NULL)
    284 		return LIST_FIRST(&vfs_list);
    285 	else
    286 		return LIST_NEXT(ops, vfs_list);
    287 }
    288 
    289 struct vfsops *
    290 rump_vfs_getopsbyname(const char *name)
    291 {
    292 
    293 	return vfs_getopsbyname(name);
    294 }
    295 
    296 int
    297 rump_vfs_getmp(const char *path, struct mount **mpp)
    298 {
    299 	struct vnode *vp;
    300 	int rv;
    301 
    302 	if ((rv = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp)) != 0)
    303 		return rv;
    304 
    305 	*mpp = vp->v_mount;
    306 	vrele(vp);
    307 	return 0;
    308 }
    309 
    310 struct vattr*
    311 rump_vattr_init(void)
    312 {
    313 	struct vattr *vap;
    314 
    315 	vap = kmem_alloc(sizeof(struct vattr), KM_SLEEP);
    316 	vattr_null(vap);
    317 
    318 	return vap;
    319 }
    320 
    321 void
    322 rump_vattr_settype(struct vattr *vap, enum vtype vt)
    323 {
    324 
    325 	vap->va_type = vt;
    326 }
    327 
    328 void
    329 rump_vattr_setmode(struct vattr *vap, mode_t mode)
    330 {
    331 
    332 	vap->va_mode = mode;
    333 }
    334 
    335 void
    336 rump_vattr_setrdev(struct vattr *vap, dev_t dev)
    337 {
    338 
    339 	vap->va_rdev = dev;
    340 }
    341 
    342 void
    343 rump_vattr_free(struct vattr *vap)
    344 {
    345 
    346 	kmem_free(vap, sizeof(*vap));
    347 }
    348 
    349 void
    350 rump_vp_incref(struct vnode *vp)
    351 {
    352 
    353 	vref(vp);
    354 }
    355 
    356 int
    357 rump_vp_getref(struct vnode *vp)
    358 {
    359 
    360 	return vp->v_usecount;
    361 }
    362 
    363 void
    364 rump_vp_rele(struct vnode *vp)
    365 {
    366 
    367 	vrele(vp);
    368 }
    369 
    370 void
    371 rump_vp_interlock(struct vnode *vp)
    372 {
    373 
    374 	mutex_enter(&vp->v_interlock);
    375 }
    376 
    377 int
    378 rump_vfs_unmount(struct mount *mp, int mntflags)
    379 {
    380 
    381 	return VFS_UNMOUNT(mp, mntflags);
    382 }
    383 
    384 int
    385 rump_vfs_root(struct mount *mp, struct vnode **vpp, int lock)
    386 {
    387 	int rv;
    388 
    389 	rv = VFS_ROOT(mp, vpp);
    390 	if (rv)
    391 		return rv;
    392 
    393 	if (!lock)
    394 		VOP_UNLOCK(*vpp);
    395 
    396 	return 0;
    397 }
    398 
    399 int
    400 rump_vfs_statvfs(struct mount *mp, struct statvfs *sbp)
    401 {
    402 
    403 	return VFS_STATVFS(mp, sbp);
    404 }
    405 
    406 int
    407 rump_vfs_sync(struct mount *mp, int wait, kauth_cred_t cred)
    408 {
    409 
    410 	return VFS_SYNC(mp, wait ? MNT_WAIT : MNT_NOWAIT, cred);
    411 }
    412 
    413 int
    414 rump_vfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
    415 {
    416 
    417 	return VFS_FHTOVP(mp, fid, vpp);
    418 }
    419 
    420 int
    421 rump_vfs_vptofh(struct vnode *vp, struct fid *fid, size_t *fidsize)
    422 {
    423 
    424 	return VFS_VPTOFH(vp, fid, fidsize);
    425 }
    426 
    427 int
    428 rump_vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
    429 	int attrnamespace, const char *attrname)
    430 {
    431 
    432 	return VFS_EXTATTRCTL(mp, cmd, vp, attrnamespace, attrname);
    433 }
    434 
    435 /*ARGSUSED*/
    436 void
    437 rump_vfs_syncwait(struct mount *mp)
    438 {
    439 	int n;
    440 
    441 	n = buf_syncwait();
    442 	if (n)
    443 		printf("syncwait: unsynced buffers: %d\n", n);
    444 }
    445 
    446 /*
    447  * Dump info about mount point.  No locking.
    448  */
    449 void
    450 rump_vfs_mount_print(const char *path, int full)
    451 {
    452 #ifdef DEBUGPRINT
    453 	struct vnode *mvp;
    454 	struct vnode *vp;
    455 	int error;
    456 
    457 	rumpuser_dprintf("\n==== dumping mountpoint at ``%s'' ====\n\n", path);
    458 	if ((error = namei_simple_user(path, NSM_FOLLOW_NOEMULROOT, &mvp))!=0) {
    459 		rumpuser_dprintf("==== lookup error %d ====\n\n", error);
    460 		return;
    461 	}
    462 	vfs_mount_print(mvp->v_mount, full, (void *)rumpuser_dprintf);
    463 	if (full) {
    464 		rumpuser_dprintf("\n== dumping vnodes ==\n\n");
    465 		TAILQ_FOREACH(vp, &mvp->v_mount->mnt_vnodelist, v_mntvnodes) {
    466 			vfs_vnode_print(vp, full, (void *)rumpuser_dprintf);
    467 		}
    468 	}
    469 	vrele(mvp);
    470 	rumpuser_dprintf("\n==== done ====\n\n");
    471 #else
    472 	rumpuser_dprintf("mount dump not supported without DEBUGPRINT\n");
    473 #endif
    474 }
    475 
    476 void
    477 rump_biodone(void *arg, size_t count, int error)
    478 {
    479 	struct buf *bp = arg;
    480 
    481 	bp->b_resid = bp->b_bcount - count;
    482 	KASSERT(bp->b_resid >= 0);
    483 	bp->b_error = error;
    484 
    485 	biodone(bp);
    486 }
    487 
    488 static void
    489 rump_rcvp_lwpset(struct vnode *rvp, struct vnode *cvp, struct lwp *l)
    490 {
    491 	struct cwdinfo *cwdi = l->l_proc->p_cwdi;
    492 
    493 	KASSERT(cvp);
    494 
    495 	rw_enter(&cwdi->cwdi_lock, RW_WRITER);
    496 	if (cwdi->cwdi_rdir)
    497 		vrele(cwdi->cwdi_rdir);
    498 	if (rvp)
    499 		vref(rvp);
    500 	cwdi->cwdi_rdir = rvp;
    501 
    502 	vrele(cwdi->cwdi_cdir);
    503 	vref(cvp);
    504 	cwdi->cwdi_cdir = cvp;
    505 	rw_exit(&cwdi->cwdi_lock);
    506 }
    507 
    508 void
    509 rump_rcvp_set(struct vnode *rvp, struct vnode *cvp)
    510 {
    511 
    512 	rump_rcvp_lwpset(rvp, cvp, curlwp);
    513 }
    514 
    515 struct vnode *
    516 rump_cdir_get(void)
    517 {
    518 	struct vnode *vp;
    519 	struct cwdinfo *cwdi = curlwp->l_proc->p_cwdi;
    520 
    521 	rw_enter(&cwdi->cwdi_lock, RW_READER);
    522 	vp = cwdi->cwdi_cdir;
    523 	rw_exit(&cwdi->cwdi_lock);
    524 	vref(vp);
    525 
    526 	return vp;
    527 }
    528