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rump_vfs.c revision 1.67.12.1 
      1 /*	$NetBSD: rump_vfs.c,v 1.67.12.1 2012/11/20 03:02:50 tls 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 1.67.12.1 2012/11/20 03:02:50 tls 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 extern struct cwdinfo cwdi0;
     60 const char *rootfstype = ROOT_FSTYPE_ANY;
     61 
     62 static void
     63 pvfs_init(struct proc *p)
     64 {
     65 
     66 	p->p_cwdi = cwdinit();
     67 }
     68 
     69 static void
     70 pvfs_rele(struct proc *p)
     71 {
     72 
     73 	cwdfree(p->p_cwdi);
     74 }
     75 
     76 void
     77 rump_vfs_init(void)
     78 {
     79 	extern struct devsw_conv devsw_conv0[];
     80 	extern int max_devsw_convs;
     81 	extern struct vfsops rumpfs_vfsops;
     82 	char buf[64];
     83 	int error;
     84 	int rv, i;
     85 
     86 	if (rumpuser_getenv("RUMP_NVNODES", buf, sizeof(buf), &error) == 0) {
     87 		desiredvnodes = strtoul(buf, NULL, 10);
     88 	} else {
     89 		desiredvnodes = 1<<10;
     90 	}
     91 
     92 	rumpblk_init();
     93 
     94 	for (i = 0; i < ncpu; i++) {
     95 		struct cpu_info *ci = cpu_lookup(i);
     96 		cache_cpu_init(ci);
     97 	}
     98 
     99 	/* make number of bufpages 5% of total memory limit */
    100 	if (rump_physmemlimit != RUMPMEM_UNLIMITED) {
    101 		extern u_int bufpages;
    102 		bufpages = rump_physmemlimit / (20 * PAGE_SIZE);
    103 	}
    104 
    105 	vfsinit();
    106 	bufinit();
    107 	cwd_sys_init();
    108 	lf_init();
    109 	spec_init();
    110 	fstrans_init();
    111 
    112 	if (rump_threads) {
    113 		if ((rv = kthread_create(PRI_BIO, KTHREAD_MPSAFE, NULL,
    114 		    rumpuser_biothread, rump_biodone, NULL, "rmpabio")) != 0)
    115 			panic("syncer thread create failed: %d", rv);
    116 	}
    117 
    118 	root_device = &rump_rootdev;
    119 
    120 	/* bootstrap cwdi (rest done in vfs_mountroot() */
    121 	proc0.p_cwdi = &cwdi0;
    122 	proc0.p_cwdi = cwdinit();
    123 
    124 	vfs_attach(&rumpfs_vfsops);
    125 	vfs_mountroot();
    126 
    127 	/* "mtree": create /dev */
    128 	do_sys_mkdir("/dev", 0777, UIO_SYSSPACE);
    129 	rump_devnull_init();
    130 
    131 	rump_proc_vfs_init = pvfs_init;
    132 	rump_proc_vfs_release = pvfs_rele;
    133 
    134 	if (rump_threads) {
    135 		if ((rv = kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL,
    136 		    sched_sync, NULL, NULL, "ioflush")) != 0)
    137 			panic("syncer thread create failed: %d", rv);
    138 	} else {
    139 		syncdelay = 0;
    140 	}
    141 
    142 	/*
    143 	 * On archs where the native kernel ABI is supported, map
    144 	 * host module directory to rump.  This means that kernel
    145 	 * modules from the host will be autoloaded to rump kernels.
    146 	 */
    147 #ifdef _RUMP_NATIVE_ABI
    148 	{
    149 	char *mbase;
    150 
    151 	if (rumpuser_getenv("RUMP_MODULEBASE", buf, sizeof(buf), &error) == 0)
    152 		mbase = buf;
    153 	else
    154 		mbase = module_base;
    155 
    156 	if (strlen(mbase) != 0 && *mbase != '0') {
    157 		rump_etfs_register(module_base, mbase, RUMP_ETFS_DIR_SUBDIRS);
    158 	}
    159 	}
    160 #endif
    161 
    162 	module_init_class(MODULE_CLASS_VFS);
    163 
    164 	rump_vfs_builddevs(devsw_conv0, max_devsw_convs);
    165 
    166 	rump_component_init(RUMP_COMPONENT_VFS);
    167 }
    168 
    169 void
    170 rump_vfs_fini(void)
    171 {
    172 
    173 	vfs_shutdown();
    174 }
    175 
    176 struct rumpcn {
    177 	struct componentname rcn_cn;
    178 	char *rcn_path;
    179 };
    180 
    181 struct componentname *
    182 rump_makecn(u_long nameiop, u_long flags, const char *name, size_t namelen,
    183 	kauth_cred_t creds, struct lwp *l)
    184 {
    185 	struct rumpcn *rcn;
    186 	struct componentname *cnp;
    187 
    188 	rcn = kmem_zalloc(sizeof(*rcn), KM_SLEEP);
    189 	cnp = &rcn->rcn_cn;
    190 
    191 	rcn->rcn_path = PNBUF_GET();
    192 	strlcpy(rcn->rcn_path, name, MAXPATHLEN);
    193 	cnp->cn_nameptr = rcn->rcn_path;
    194 
    195 	cnp->cn_nameiop = nameiop;
    196 	cnp->cn_flags = flags & (MODMASK | PARAMASK);
    197 
    198 	cnp->cn_namelen = namelen;
    199 
    200 	cnp->cn_cred = creds;
    201 
    202 	return cnp;
    203 }
    204 
    205 void
    206 rump_freecn(struct componentname *cnp, int flags)
    207 {
    208 	struct rumpcn *rcn = (void *)cnp;
    209 
    210 	if (flags & RUMPCN_FREECRED)
    211 		rump_cred_put(cnp->cn_cred);
    212 
    213 	PNBUF_PUT(rcn->rcn_path);
    214 	kmem_free(rcn, sizeof(*rcn));
    215 }
    216 
    217 /* hey baby, what's your namei? */
    218 int
    219 rump_namei(uint32_t op, uint32_t flags, const char *namep,
    220 	struct vnode **dvpp, struct vnode **vpp, struct componentname **cnpp)
    221 {
    222 	struct pathbuf *pb;
    223 	struct nameidata nd;
    224 	int rv;
    225 
    226 	pb = pathbuf_create(namep);
    227 	if (pb == NULL) {
    228 		return ENOMEM;
    229 	}
    230 	NDINIT(&nd, op, flags, pb);
    231 	rv = namei(&nd);
    232 	if (rv) {
    233 		pathbuf_destroy(pb);
    234 		return rv;
    235 	}
    236 
    237 	if (dvpp) {
    238 		KASSERT(flags & LOCKPARENT);
    239 		*dvpp = nd.ni_dvp;
    240 	} else {
    241 		KASSERT((flags & LOCKPARENT) == 0);
    242 	}
    243 
    244 	if (vpp) {
    245 		*vpp = nd.ni_vp;
    246 	} else {
    247 		if (nd.ni_vp) {
    248 			if (flags & LOCKLEAF)
    249 				vput(nd.ni_vp);
    250 			else
    251 				vrele(nd.ni_vp);
    252 		}
    253 	}
    254 
    255 	if (cnpp) {
    256 		struct componentname *cnp;
    257 
    258 		cnp = kmem_alloc(sizeof(*cnp), KM_SLEEP);
    259 		memcpy(cnp, &nd.ni_cnd, sizeof(*cnp));
    260 		*cnpp = cnp;
    261 	}
    262 	pathbuf_destroy(pb);
    263 
    264 	return rv;
    265 }
    266 
    267 void
    268 rump_getvninfo(struct vnode *vp, enum rump_vtype *vtype,
    269 	voff_t *vsize, dev_t *vdev)
    270 {
    271 
    272 	*vtype = vp->v_type;
    273 	*vsize = vp->v_size;
    274 	if (vp->v_specnode)
    275 		*vdev = vp->v_rdev;
    276 	else
    277 		*vdev = 0;
    278 }
    279 
    280 struct vfsops *
    281 rump_vfslist_iterate(struct vfsops *ops)
    282 {
    283 
    284 	if (ops == NULL)
    285 		return LIST_FIRST(&vfs_list);
    286 	else
    287 		return LIST_NEXT(ops, vfs_list);
    288 }
    289 
    290 struct vfsops *
    291 rump_vfs_getopsbyname(const char *name)
    292 {
    293 
    294 	return vfs_getopsbyname(name);
    295 }
    296 
    297 int
    298 rump_vfs_getmp(const char *path, struct mount **mpp)
    299 {
    300 	struct vnode *vp;
    301 	int rv;
    302 
    303 	if ((rv = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp)) != 0)
    304 		return rv;
    305 
    306 	*mpp = vp->v_mount;
    307 	vrele(vp);
    308 	return 0;
    309 }
    310 
    311 struct vattr*
    312 rump_vattr_init(void)
    313 {
    314 	struct vattr *vap;
    315 
    316 	vap = kmem_alloc(sizeof(struct vattr), KM_SLEEP);
    317 	vattr_null(vap);
    318 
    319 	return vap;
    320 }
    321 
    322 void
    323 rump_vattr_settype(struct vattr *vap, enum rump_vtype vt)
    324 {
    325 
    326 	vap->va_type = vt;
    327 }
    328 
    329 void
    330 rump_vattr_setmode(struct vattr *vap, mode_t mode)
    331 {
    332 
    333 	vap->va_mode = mode;
    334 }
    335 
    336 void
    337 rump_vattr_setrdev(struct vattr *vap, dev_t dev)
    338 {
    339 
    340 	vap->va_rdev = dev;
    341 }
    342 
    343 void
    344 rump_vattr_free(struct vattr *vap)
    345 {
    346 
    347 	kmem_free(vap, sizeof(*vap));
    348 }
    349 
    350 void
    351 rump_vp_incref(struct vnode *vp)
    352 {
    353 
    354 	vref(vp);
    355 }
    356 
    357 int
    358 rump_vp_getref(struct vnode *vp)
    359 {
    360 
    361 	return vp->v_usecount;
    362 }
    363 
    364 void
    365 rump_vp_rele(struct vnode *vp)
    366 {
    367 
    368 	vrele(vp);
    369 }
    370 
    371 void
    372 rump_vp_interlock(struct vnode *vp)
    373 {
    374 
    375 	mutex_enter(vp->v_interlock);
    376 }
    377 
    378 int
    379 rump_vfs_unmount(struct mount *mp, int mntflags)
    380 {
    381 
    382 	return VFS_UNMOUNT(mp, mntflags);
    383 }
    384 
    385 int
    386 rump_vfs_root(struct mount *mp, struct vnode **vpp, int lock)
    387 {
    388 	int rv;
    389 
    390 	rv = VFS_ROOT(mp, vpp);
    391 	if (rv)
    392 		return rv;
    393 
    394 	if (!lock)
    395 		VOP_UNLOCK(*vpp);
    396 
    397 	return 0;
    398 }
    399 
    400 int
    401 rump_vfs_statvfs(struct mount *mp, struct statvfs *sbp)
    402 {
    403 
    404 	return VFS_STATVFS(mp, sbp);
    405 }
    406 
    407 int
    408 rump_vfs_sync(struct mount *mp, int wait, kauth_cred_t cred)
    409 {
    410 
    411 	return VFS_SYNC(mp, wait ? MNT_WAIT : MNT_NOWAIT, cred);
    412 }
    413 
    414 int
    415 rump_vfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
    416 {
    417 
    418 	return VFS_FHTOVP(mp, fid, vpp);
    419 }
    420 
    421 int
    422 rump_vfs_vptofh(struct vnode *vp, struct fid *fid, size_t *fidsize)
    423 {
    424 
    425 	return VFS_VPTOFH(vp, fid, fidsize);
    426 }
    427 
    428 int
    429 rump_vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
    430 	int attrnamespace, const char *attrname)
    431 {
    432 
    433 	return VFS_EXTATTRCTL(mp, cmd, vp, attrnamespace, attrname);
    434 }
    435 
    436 /*ARGSUSED*/
    437 void
    438 rump_vfs_syncwait(struct mount *mp)
    439 {
    440 	int n;
    441 
    442 	n = buf_syncwait();
    443 	if (n)
    444 		printf("syncwait: unsynced buffers: %d\n", n);
    445 }
    446 
    447 /*
    448  * Dump info about mount point.  No locking.
    449  */
    450 void
    451 rump_vfs_mount_print(const char *path, int full)
    452 {
    453 #ifdef DEBUGPRINT
    454 	struct vnode *mvp;
    455 	struct vnode *vp;
    456 	int error;
    457 
    458 	rumpuser_dprintf("\n==== dumping mountpoint at ``%s'' ====\n\n", path);
    459 	if ((error = namei_simple_user(path, NSM_FOLLOW_NOEMULROOT, &mvp))!=0) {
    460 		rumpuser_dprintf("==== lookup error %d ====\n\n", error);
    461 		return;
    462 	}
    463 	vfs_mount_print(mvp->v_mount, full, (void *)rumpuser_dprintf);
    464 	if (full) {
    465 		rumpuser_dprintf("\n== dumping vnodes ==\n\n");
    466 		TAILQ_FOREACH(vp, &mvp->v_mount->mnt_vnodelist, v_mntvnodes) {
    467 			vfs_vnode_print(vp, full, (void *)rumpuser_dprintf);
    468 		}
    469 	}
    470 	vrele(mvp);
    471 	rumpuser_dprintf("\n==== done ====\n\n");
    472 #else
    473 	rumpuser_dprintf("mount dump not supported without DEBUGPRINT\n");
    474 #endif
    475 }
    476 
    477 void
    478 rump_biodone(void *arg, size_t count, int error)
    479 {
    480 	struct buf *bp = arg;
    481 
    482 	bp->b_resid = bp->b_bcount - count;
    483 	KASSERT(bp->b_resid >= 0);
    484 	bp->b_error = error;
    485 
    486 	biodone(bp);
    487 }
    488 
    489 void
    490 rump_vfs_drainbufs(int npages)
    491 {
    492 
    493 	mutex_enter(&bufcache_lock);
    494 	buf_drain(npages);
    495 	mutex_exit(&bufcache_lock);
    496 }
    497