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rump_vfs.c revision 1.52 
      1 /*	$NetBSD: rump_vfs.c,v 1.52 2010/05/26 21:50:56 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 1.52 2010/05/26 21:50:56 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 	rump_etfs_register(module_base, module_base, RUMP_ETFS_DIR_SUBDIRS);
    148 #endif
    149 
    150 	module_init_class(MODULE_CLASS_VFS);
    151 
    152 	rump_vfs_builddevs(devsw_conv0, max_devsw_convs);
    153 }
    154 
    155 void
    156 rump_vfs_fini(void)
    157 {
    158 
    159 	vfs_shutdown();
    160 }
    161 
    162 struct componentname *
    163 rump_makecn(u_long nameiop, u_long flags, const char *name, size_t namelen,
    164 	kauth_cred_t creds, struct lwp *l)
    165 {
    166 	struct componentname *cnp;
    167 	const char *cp = NULL;
    168 
    169 	cnp = kmem_zalloc(sizeof(struct componentname), KM_SLEEP);
    170 
    171 	cnp->cn_nameiop = nameiop;
    172 	cnp->cn_flags = flags;
    173 
    174 	cnp->cn_pnbuf = PNBUF_GET();
    175 	strcpy(cnp->cn_pnbuf, name);
    176 	cnp->cn_nameptr = cnp->cn_pnbuf;
    177 	cnp->cn_namelen = namelen;
    178 	cnp->cn_hash = namei_hash(name, &cp);
    179 
    180 	cnp->cn_cred = creds;
    181 
    182 	return cnp;
    183 }
    184 
    185 void
    186 rump_freecn(struct componentname *cnp, int flags)
    187 {
    188 
    189 	if (flags & RUMPCN_FREECRED)
    190 		rump_cred_put(cnp->cn_cred);
    191 
    192 	if ((cnp->cn_flags & SAVENAME) == 0 || flags & RUMPCN_FORCEFREE)
    193 		PNBUF_PUT(cnp->cn_pnbuf);
    194 	kmem_free(cnp, sizeof(*cnp));
    195 }
    196 
    197 int
    198 rump_checksavecn(struct componentname *cnp)
    199 {
    200 
    201 	if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0) {
    202 		return 0;
    203 	} else {
    204 		cnp->cn_flags |= HASBUF;
    205 		return 1;
    206 	}
    207 }
    208 
    209 /* hey baby, what's your namei? */
    210 int
    211 rump_namei(uint32_t op, uint32_t flags, const char *namep,
    212 	struct vnode **dvpp, struct vnode **vpp, struct componentname **cnpp)
    213 {
    214 	struct nameidata nd;
    215 	int rv;
    216 
    217 	NDINIT(&nd, op, flags, UIO_SYSSPACE, namep);
    218 	rv = namei(&nd);
    219 	if (rv)
    220 		return rv;
    221 
    222 	if (dvpp) {
    223 		KASSERT(flags & LOCKPARENT);
    224 		*dvpp = nd.ni_dvp;
    225 	} else {
    226 		KASSERT((flags & LOCKPARENT) == 0);
    227 	}
    228 
    229 	if (vpp) {
    230 		*vpp = nd.ni_vp;
    231 	} else {
    232 		if (nd.ni_vp) {
    233 			if (flags & LOCKLEAF)
    234 				vput(nd.ni_vp);
    235 			else
    236 				vrele(nd.ni_vp);
    237 		}
    238 	}
    239 
    240 	if (cnpp) {
    241 		struct componentname *cnp;
    242 
    243 		cnp = kmem_alloc(sizeof(*cnp), KM_SLEEP);
    244 		memcpy(cnp, &nd.ni_cnd, sizeof(*cnp));
    245 		*cnpp = cnp;
    246 	} else if (nd.ni_cnd.cn_flags & HASBUF) {
    247 		panic("%s: pathbuf mismatch", __func__);
    248 	}
    249 
    250 	return rv;
    251 }
    252 
    253 void
    254 rump_getvninfo(struct vnode *vp, enum vtype *vtype,
    255 	voff_t *vsize, dev_t *vdev)
    256 {
    257 
    258 	*vtype = vp->v_type;
    259 	*vsize = vp->v_size;
    260 	if (vp->v_specnode)
    261 		*vdev = vp->v_rdev;
    262 	else
    263 		*vdev = 0;
    264 }
    265 
    266 struct vfsops *
    267 rump_vfslist_iterate(struct vfsops *ops)
    268 {
    269 
    270 	if (ops == NULL)
    271 		return LIST_FIRST(&vfs_list);
    272 	else
    273 		return LIST_NEXT(ops, vfs_list);
    274 }
    275 
    276 struct vfsops *
    277 rump_vfs_getopsbyname(const char *name)
    278 {
    279 
    280 	return vfs_getopsbyname(name);
    281 }
    282 
    283 int
    284 rump_vfs_getmp(const char *path, struct mount **mpp)
    285 {
    286 	struct vnode *vp;
    287 	int rv;
    288 
    289 	if ((rv = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp)) != 0)
    290 		return rv;
    291 
    292 	*mpp = vp->v_mount;
    293 	vrele(vp);
    294 	return 0;
    295 }
    296 
    297 struct vattr*
    298 rump_vattr_init(void)
    299 {
    300 	struct vattr *vap;
    301 
    302 	vap = kmem_alloc(sizeof(struct vattr), KM_SLEEP);
    303 	vattr_null(vap);
    304 
    305 	return vap;
    306 }
    307 
    308 void
    309 rump_vattr_settype(struct vattr *vap, enum vtype vt)
    310 {
    311 
    312 	vap->va_type = vt;
    313 }
    314 
    315 void
    316 rump_vattr_setmode(struct vattr *vap, mode_t mode)
    317 {
    318 
    319 	vap->va_mode = mode;
    320 }
    321 
    322 void
    323 rump_vattr_setrdev(struct vattr *vap, dev_t dev)
    324 {
    325 
    326 	vap->va_rdev = dev;
    327 }
    328 
    329 void
    330 rump_vattr_free(struct vattr *vap)
    331 {
    332 
    333 	kmem_free(vap, sizeof(*vap));
    334 }
    335 
    336 void
    337 rump_vp_incref(struct vnode *vp)
    338 {
    339 
    340 	vref(vp);
    341 }
    342 
    343 int
    344 rump_vp_getref(struct vnode *vp)
    345 {
    346 
    347 	return vp->v_usecount;
    348 }
    349 
    350 void
    351 rump_vp_rele(struct vnode *vp)
    352 {
    353 
    354 	vrele(vp);
    355 }
    356 
    357 void
    358 rump_vp_interlock(struct vnode *vp)
    359 {
    360 
    361 	mutex_enter(&vp->v_interlock);
    362 }
    363 
    364 int
    365 rump_vfs_unmount(struct mount *mp, int mntflags)
    366 {
    367 
    368 	return VFS_UNMOUNT(mp, mntflags);
    369 }
    370 
    371 int
    372 rump_vfs_root(struct mount *mp, struct vnode **vpp, int lock)
    373 {
    374 	int rv;
    375 
    376 	rv = VFS_ROOT(mp, vpp);
    377 	if (rv)
    378 		return rv;
    379 
    380 	if (!lock)
    381 		VOP_UNLOCK(*vpp, 0);
    382 
    383 	return 0;
    384 }
    385 
    386 int
    387 rump_vfs_statvfs(struct mount *mp, struct statvfs *sbp)
    388 {
    389 
    390 	return VFS_STATVFS(mp, sbp);
    391 }
    392 
    393 int
    394 rump_vfs_sync(struct mount *mp, int wait, kauth_cred_t cred)
    395 {
    396 
    397 	return VFS_SYNC(mp, wait ? MNT_WAIT : MNT_NOWAIT, cred);
    398 }
    399 
    400 int
    401 rump_vfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
    402 {
    403 
    404 	return VFS_FHTOVP(mp, fid, vpp);
    405 }
    406 
    407 int
    408 rump_vfs_vptofh(struct vnode *vp, struct fid *fid, size_t *fidsize)
    409 {
    410 
    411 	return VFS_VPTOFH(vp, fid, fidsize);
    412 }
    413 
    414 int
    415 rump_vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
    416 	int attrnamespace, const char *attrname)
    417 {
    418 
    419 	return VFS_EXTATTRCTL(mp, cmd, vp, attrnamespace, attrname);
    420 }
    421 
    422 /*ARGSUSED*/
    423 void
    424 rump_vfs_syncwait(struct mount *mp)
    425 {
    426 	int n;
    427 
    428 	n = buf_syncwait();
    429 	if (n)
    430 		printf("syncwait: unsynced buffers: %d\n", n);
    431 }
    432 
    433 /*
    434  * Dump info about mount point.  No locking.
    435  */
    436 void
    437 rump_vfs_mount_print(const char *path, int full)
    438 {
    439 #ifdef DEBUGPRINT
    440 	struct vnode *mvp;
    441 	struct vnode *vp;
    442 	int error;
    443 
    444 	rumpuser_dprintf("\n==== dumping mountpoint at ``%s'' ====\n\n", path);
    445 	if ((error = namei_simple_user(path, NSM_FOLLOW_NOEMULROOT, &mvp))!=0) {
    446 		rumpuser_dprintf("==== lookup error %d ====\n\n", error);
    447 		return;
    448 	}
    449 	vfs_mount_print(mvp->v_mount, full, (void *)rumpuser_dprintf);
    450 	if (full) {
    451 		rumpuser_dprintf("\n== dumping vnodes ==\n\n");
    452 		TAILQ_FOREACH(vp, &mvp->v_mount->mnt_vnodelist, v_mntvnodes) {
    453 			vfs_vnode_print(vp, full, (void *)rumpuser_dprintf);
    454 		}
    455 	}
    456 	vrele(mvp);
    457 	rumpuser_dprintf("\n==== done ====\n\n");
    458 #else
    459 	rumpuser_dprintf("mount dump not supported without DEBUGPRINT\n");
    460 #endif
    461 }
    462 
    463 void
    464 rump_biodone(void *arg, size_t count, int error)
    465 {
    466 	struct buf *bp = arg;
    467 
    468 	bp->b_resid = bp->b_bcount - count;
    469 	KASSERT(bp->b_resid >= 0);
    470 	bp->b_error = error;
    471 
    472 	biodone(bp);
    473 }
    474 
    475 static void
    476 rump_rcvp_lwpset(struct vnode *rvp, struct vnode *cvp, struct lwp *l)
    477 {
    478 	struct cwdinfo *cwdi = l->l_proc->p_cwdi;
    479 
    480 	KASSERT(cvp);
    481 
    482 	rw_enter(&cwdi->cwdi_lock, RW_WRITER);
    483 	if (cwdi->cwdi_rdir)
    484 		vrele(cwdi->cwdi_rdir);
    485 	if (rvp)
    486 		vref(rvp);
    487 	cwdi->cwdi_rdir = rvp;
    488 
    489 	vrele(cwdi->cwdi_cdir);
    490 	vref(cvp);
    491 	cwdi->cwdi_cdir = cvp;
    492 	rw_exit(&cwdi->cwdi_lock);
    493 }
    494 
    495 void
    496 rump_rcvp_set(struct vnode *rvp, struct vnode *cvp)
    497 {
    498 
    499 	rump_rcvp_lwpset(rvp, cvp, curlwp);
    500 }
    501 
    502 struct vnode *
    503 rump_cdir_get(void)
    504 {
    505 	struct vnode *vp;
    506 	struct cwdinfo *cwdi = curlwp->l_proc->p_cwdi;
    507 
    508 	rw_enter(&cwdi->cwdi_lock, RW_READER);
    509 	vp = cwdi->cwdi_cdir;
    510 	rw_exit(&cwdi->cwdi_lock);
    511 	vref(vp);
    512 
    513 	return vp;
    514 }
    515