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ffs_vfsops.c revision 1.278.2.4
      1 /*	$NetBSD: ffs_vfsops.c,v 1.278.2.4 2013/02/25 00:30:15 tls Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Wasabi Systems, Inc, and by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 1989, 1991, 1993, 1994
     34  *	The Regents of the University of California.  All rights reserved.
     35  *
     36  * Redistribution and use in source and binary forms, with or without
     37  * modification, are permitted provided that the following conditions
     38  * are met:
     39  * 1. Redistributions of source code must retain the above copyright
     40  *    notice, this list of conditions and the following disclaimer.
     41  * 2. Redistributions in binary form must reproduce the above copyright
     42  *    notice, this list of conditions and the following disclaimer in the
     43  *    documentation and/or other materials provided with the distribution.
     44  * 3. Neither the name of the University nor the names of its contributors
     45  *    may be used to endorse or promote products derived from this software
     46  *    without specific prior written permission.
     47  *
     48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     58  * SUCH DAMAGE.
     59  *
     60  *	@(#)ffs_vfsops.c	8.31 (Berkeley) 5/20/95
     61  */
     62 
     63 #include <sys/cdefs.h>
     64 __KERNEL_RCSID(0, "$NetBSD: ffs_vfsops.c,v 1.278.2.4 2013/02/25 00:30:15 tls Exp $");
     65 
     66 #if defined(_KERNEL_OPT)
     67 #include "opt_ffs.h"
     68 #include "opt_quota.h"
     69 #include "opt_wapbl.h"
     70 #endif
     71 
     72 #include <sys/param.h>
     73 #include <sys/systm.h>
     74 #include <sys/namei.h>
     75 #include <sys/proc.h>
     76 #include <sys/kernel.h>
     77 #include <sys/vnode.h>
     78 #include <sys/socket.h>
     79 #include <sys/mount.h>
     80 #include <sys/buf.h>
     81 #include <sys/device.h>
     82 #include <sys/disk.h>
     83 #include <sys/mbuf.h>
     84 #include <sys/file.h>
     85 #include <sys/disklabel.h>
     86 #include <sys/ioctl.h>
     87 #include <sys/errno.h>
     88 #include <sys/kmem.h>
     89 #include <sys/pool.h>
     90 #include <sys/lock.h>
     91 #include <sys/sysctl.h>
     92 #include <sys/conf.h>
     93 #include <sys/kauth.h>
     94 #include <sys/wapbl.h>
     95 #include <sys/fstrans.h>
     96 #include <sys/module.h>
     97 
     98 #include <miscfs/genfs/genfs.h>
     99 #include <miscfs/specfs/specdev.h>
    100 
    101 #include <ufs/ufs/quota.h>
    102 #include <ufs/ufs/ufsmount.h>
    103 #include <ufs/ufs/inode.h>
    104 #include <ufs/ufs/dir.h>
    105 #include <ufs/ufs/ufs_extern.h>
    106 #include <ufs/ufs/ufs_bswap.h>
    107 #include <ufs/ufs/ufs_wapbl.h>
    108 
    109 #include <ufs/ffs/fs.h>
    110 #include <ufs/ffs/ffs_extern.h>
    111 
    112 MODULE(MODULE_CLASS_VFS, ffs, NULL);
    113 
    114 static int	ffs_vfs_fsync(vnode_t *, int);
    115 
    116 static struct sysctllog *ffs_sysctl_log;
    117 
    118 static kauth_listener_t ffs_snapshot_listener;
    119 
    120 /* how many times ffs_init() was called */
    121 int ffs_initcount = 0;
    122 
    123 extern const struct vnodeopv_desc ffs_vnodeop_opv_desc;
    124 extern const struct vnodeopv_desc ffs_specop_opv_desc;
    125 extern const struct vnodeopv_desc ffs_fifoop_opv_desc;
    126 
    127 const struct vnodeopv_desc * const ffs_vnodeopv_descs[] = {
    128 	&ffs_vnodeop_opv_desc,
    129 	&ffs_specop_opv_desc,
    130 	&ffs_fifoop_opv_desc,
    131 	NULL,
    132 };
    133 
    134 struct vfsops ffs_vfsops = {
    135 	MOUNT_FFS,
    136 	sizeof (struct ufs_args),
    137 	ffs_mount,
    138 	ufs_start,
    139 	ffs_unmount,
    140 	ufs_root,
    141 	ufs_quotactl,
    142 	ffs_statvfs,
    143 	ffs_sync,
    144 	ffs_vget,
    145 	ffs_fhtovp,
    146 	ffs_vptofh,
    147 	ffs_init,
    148 	ffs_reinit,
    149 	ffs_done,
    150 	ffs_mountroot,
    151 	ffs_snapshot,
    152 	ffs_extattrctl,
    153 	ffs_suspendctl,
    154 	genfs_renamelock_enter,
    155 	genfs_renamelock_exit,
    156 	ffs_vfs_fsync,
    157 	ffs_vnodeopv_descs,
    158 	0,
    159 	{ NULL, NULL },
    160 };
    161 
    162 static const struct genfs_ops ffs_genfsops = {
    163 	.gop_size = ffs_gop_size,
    164 	.gop_alloc = ufs_gop_alloc,
    165 	.gop_write = genfs_gop_write,
    166 	.gop_markupdate = ufs_gop_markupdate,
    167 };
    168 
    169 static const struct ufs_ops ffs_ufsops = {
    170 	.uo_itimes = ffs_itimes,
    171 	.uo_update = ffs_update,
    172 	.uo_truncate = ffs_truncate,
    173 	.uo_valloc = ffs_valloc,
    174 	.uo_vfree = ffs_vfree,
    175 	.uo_balloc = ffs_balloc,
    176 	.uo_unmark_vnode = (void (*)(vnode_t *))nullop,
    177 };
    178 
    179 static int
    180 ffs_snapshot_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
    181     void *arg0, void *arg1, void *arg2, void *arg3)
    182 {
    183 	vnode_t *vp = arg2;
    184 	int result = KAUTH_RESULT_DEFER;;
    185 
    186 	if (action != KAUTH_SYSTEM_FS_SNAPSHOT)
    187 		return result;
    188 
    189 	if (VTOI(vp)->i_uid == kauth_cred_geteuid(cred))
    190 		result = KAUTH_RESULT_ALLOW;
    191 
    192 	return result;
    193 }
    194 
    195 static int
    196 ffs_modcmd(modcmd_t cmd, void *arg)
    197 {
    198 	int error;
    199 
    200 #if 0
    201 	extern int doasyncfree;
    202 #endif
    203 #ifdef UFS_EXTATTR
    204 	extern int ufs_extattr_autocreate;
    205 #endif
    206 	extern int ffs_log_changeopt;
    207 
    208 	switch (cmd) {
    209 	case MODULE_CMD_INIT:
    210 		error = vfs_attach(&ffs_vfsops);
    211 		if (error != 0)
    212 			break;
    213 
    214 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    215 			       CTLFLAG_PERMANENT,
    216 			       CTLTYPE_NODE, "vfs", NULL,
    217 			       NULL, 0, NULL, 0,
    218 			       CTL_VFS, CTL_EOL);
    219 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    220 			       CTLFLAG_PERMANENT,
    221 			       CTLTYPE_NODE, "ffs",
    222 			       SYSCTL_DESCR("Berkeley Fast File System"),
    223 			       NULL, 0, NULL, 0,
    224 			       CTL_VFS, 1, CTL_EOL);
    225 		/*
    226 		 * @@@ should we even bother with these first three?
    227 		 */
    228 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    229 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    230 			       CTLTYPE_INT, "doclusterread", NULL,
    231 			       sysctl_notavail, 0, NULL, 0,
    232 			       CTL_VFS, 1, FFS_CLUSTERREAD, CTL_EOL);
    233 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    234 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    235 			       CTLTYPE_INT, "doclusterwrite", NULL,
    236 			       sysctl_notavail, 0, NULL, 0,
    237 			       CTL_VFS, 1, FFS_CLUSTERWRITE, CTL_EOL);
    238 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    239 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    240 			       CTLTYPE_INT, "doreallocblks", NULL,
    241 			       sysctl_notavail, 0, NULL, 0,
    242 			       CTL_VFS, 1, FFS_REALLOCBLKS, CTL_EOL);
    243 #if 0
    244 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    245 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    246 			       CTLTYPE_INT, "doasyncfree",
    247 			       SYSCTL_DESCR("Release dirty blocks asynchronously"),
    248 			       NULL, 0, &doasyncfree, 0,
    249 			       CTL_VFS, 1, FFS_ASYNCFREE, CTL_EOL);
    250 #endif
    251 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    252 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    253 			       CTLTYPE_INT, "log_changeopt",
    254 			       SYSCTL_DESCR("Log changes in optimization strategy"),
    255 			       NULL, 0, &ffs_log_changeopt, 0,
    256 			       CTL_VFS, 1, FFS_LOG_CHANGEOPT, CTL_EOL);
    257 #ifdef UFS_EXTATTR
    258 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    259 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    260 			       CTLTYPE_INT, "extattr_autocreate",
    261 			       SYSCTL_DESCR("Size of attribute for "
    262 					    "backing file autocreation"),
    263 			       NULL, 0, &ufs_extattr_autocreate, 0,
    264 			       CTL_VFS, 1, FFS_EXTATTR_AUTOCREATE, CTL_EOL);
    265 
    266 #endif /* UFS_EXTATTR */
    267 
    268 		ffs_snapshot_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
    269 		    ffs_snapshot_cb, NULL);
    270 		if (ffs_snapshot_listener == NULL)
    271 			printf("ffs_modcmd: can't listen on system scope.\n");
    272 
    273 		break;
    274 	case MODULE_CMD_FINI:
    275 		error = vfs_detach(&ffs_vfsops);
    276 		if (error != 0)
    277 			break;
    278 		sysctl_teardown(&ffs_sysctl_log);
    279 		if (ffs_snapshot_listener != NULL)
    280 			kauth_unlisten_scope(ffs_snapshot_listener);
    281 		break;
    282 	default:
    283 		error = ENOTTY;
    284 		break;
    285 	}
    286 
    287 	return (error);
    288 }
    289 
    290 pool_cache_t ffs_inode_cache;
    291 pool_cache_t ffs_dinode1_cache;
    292 pool_cache_t ffs_dinode2_cache;
    293 
    294 static void ffs_oldfscompat_read(struct fs *, struct ufsmount *, daddr_t);
    295 static void ffs_oldfscompat_write(struct fs *, struct ufsmount *);
    296 
    297 /*
    298  * Called by main() when ffs is going to be mounted as root.
    299  */
    300 
    301 int
    302 ffs_mountroot(void)
    303 {
    304 	struct fs *fs;
    305 	struct mount *mp;
    306 	struct lwp *l = curlwp;			/* XXX */
    307 	struct ufsmount *ump;
    308 	int error;
    309 
    310 	if (device_class(root_device) != DV_DISK)
    311 		return (ENODEV);
    312 
    313 	if ((error = vfs_rootmountalloc(MOUNT_FFS, "root_device", &mp))) {
    314 		vrele(rootvp);
    315 		return (error);
    316 	}
    317 
    318 	/*
    319 	 * We always need to be able to mount the root file system.
    320 	 */
    321 	mp->mnt_flag |= MNT_FORCE;
    322 	if ((error = ffs_mountfs(rootvp, mp, l)) != 0) {
    323 		vfs_unbusy(mp, false, NULL);
    324 		vfs_destroy(mp);
    325 		return (error);
    326 	}
    327 	mp->mnt_flag &= ~MNT_FORCE;
    328 	mutex_enter(&mountlist_lock);
    329 	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
    330 	mutex_exit(&mountlist_lock);
    331 	ump = VFSTOUFS(mp);
    332 	fs = ump->um_fs;
    333 	memset(fs->fs_fsmnt, 0, sizeof(fs->fs_fsmnt));
    334 	(void)copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0);
    335 	(void)ffs_statvfs(mp, &mp->mnt_stat);
    336 	vfs_unbusy(mp, false, NULL);
    337 	setrootfstime((time_t)fs->fs_time);
    338 	return (0);
    339 }
    340 
    341 /*
    342  * VFS Operations.
    343  *
    344  * mount system call
    345  */
    346 int
    347 ffs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
    348 {
    349 	struct lwp *l = curlwp;
    350 	struct vnode *devvp = NULL;
    351 	struct ufs_args *args = data;
    352 	struct ufsmount *ump = NULL;
    353 	struct fs *fs;
    354 	int error = 0, flags, update;
    355 	mode_t accessmode;
    356 
    357 	if (*data_len < sizeof *args)
    358 		return EINVAL;
    359 
    360 	if (mp->mnt_flag & MNT_GETARGS) {
    361 		ump = VFSTOUFS(mp);
    362 		if (ump == NULL)
    363 			return EIO;
    364 		args->fspec = NULL;
    365 		*data_len = sizeof *args;
    366 		return 0;
    367 	}
    368 
    369 	update = mp->mnt_flag & MNT_UPDATE;
    370 
    371 	/* Check arguments */
    372 	if (args->fspec != NULL) {
    373 		/*
    374 		 * Look up the name and verify that it's sane.
    375 		 */
    376 		error = namei_simple_user(args->fspec,
    377 					NSM_FOLLOW_NOEMULROOT, &devvp);
    378 		if (error != 0)
    379 			return (error);
    380 
    381 		if (!update) {
    382 			/*
    383 			 * Be sure this is a valid block device
    384 			 */
    385 			if (devvp->v_type != VBLK)
    386 				error = ENOTBLK;
    387 			else if (bdevsw_lookup(devvp->v_rdev) == NULL)
    388 				error = ENXIO;
    389 		} else {
    390 			/*
    391 			 * Be sure we're still naming the same device
    392 			 * used for our initial mount
    393 			 */
    394 			ump = VFSTOUFS(mp);
    395 			if (devvp != ump->um_devvp) {
    396 				if (devvp->v_rdev != ump->um_devvp->v_rdev)
    397 					error = EINVAL;
    398 				else {
    399 					vrele(devvp);
    400 					devvp = ump->um_devvp;
    401 					vref(devvp);
    402 				}
    403 			}
    404 		}
    405 	} else {
    406 		if (!update) {
    407 			/* New mounts must have a filename for the device */
    408 			return (EINVAL);
    409 		} else {
    410 			/* Use the extant mount */
    411 			ump = VFSTOUFS(mp);
    412 			devvp = ump->um_devvp;
    413 			vref(devvp);
    414 		}
    415 	}
    416 
    417 	/*
    418 	 * If mount by non-root, then verify that user has necessary
    419 	 * permissions on the device.
    420 	 *
    421 	 * Permission to update a mount is checked higher, so here we presume
    422 	 * updating the mount is okay (for example, as far as securelevel goes)
    423 	 * which leaves us with the normal check.
    424 	 */
    425 	if (error == 0) {
    426 		accessmode = VREAD;
    427 		if (update ?
    428 		    (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
    429 		    (mp->mnt_flag & MNT_RDONLY) == 0)
    430 			accessmode |= VWRITE;
    431 		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    432 		error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
    433 		    KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
    434 		    KAUTH_ARG(accessmode));
    435 		VOP_UNLOCK(devvp);
    436 	}
    437 
    438 	if (error) {
    439 		vrele(devvp);
    440 		return (error);
    441 	}
    442 
    443 #ifdef WAPBL
    444 	/* WAPBL can only be enabled on a r/w mount. */
    445 	if ((mp->mnt_flag & MNT_RDONLY) && !(mp->mnt_iflag & IMNT_WANTRDWR)) {
    446 		mp->mnt_flag &= ~MNT_LOG;
    447 	}
    448 #else /* !WAPBL */
    449 	mp->mnt_flag &= ~MNT_LOG;
    450 #endif /* !WAPBL */
    451 
    452 	if (!update) {
    453 		int xflags;
    454 
    455 		if (mp->mnt_flag & MNT_RDONLY)
    456 			xflags = FREAD;
    457 		else
    458 			xflags = FREAD | FWRITE;
    459 		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    460 		error = VOP_OPEN(devvp, xflags, FSCRED);
    461 		VOP_UNLOCK(devvp);
    462 		if (error)
    463 			goto fail;
    464 		error = ffs_mountfs(devvp, mp, l);
    465 		if (error) {
    466 			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    467 			(void)VOP_CLOSE(devvp, xflags, NOCRED);
    468 			VOP_UNLOCK(devvp);
    469 			goto fail;
    470 		}
    471 
    472 		ump = VFSTOUFS(mp);
    473 		fs = ump->um_fs;
    474 	} else {
    475 		/*
    476 		 * Update the mount.
    477 		 */
    478 
    479 		/*
    480 		 * The initial mount got a reference on this
    481 		 * device, so drop the one obtained via
    482 		 * namei(), above.
    483 		 */
    484 		vrele(devvp);
    485 
    486 		ump = VFSTOUFS(mp);
    487 		fs = ump->um_fs;
    488 		if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
    489 			/*
    490 			 * Changing from r/w to r/o
    491 			 */
    492 			flags = WRITECLOSE;
    493 			if (mp->mnt_flag & MNT_FORCE)
    494 				flags |= FORCECLOSE;
    495 			error = ffs_flushfiles(mp, flags, l);
    496 			if (error == 0)
    497 				error = UFS_WAPBL_BEGIN(mp);
    498 			if (error == 0 &&
    499 			    ffs_cgupdate(ump, MNT_WAIT) == 0 &&
    500 			    fs->fs_clean & FS_WASCLEAN) {
    501 				if (mp->mnt_flag & MNT_SOFTDEP)
    502 					fs->fs_flags &= ~FS_DOSOFTDEP;
    503 				fs->fs_clean = FS_ISCLEAN;
    504 				(void) ffs_sbupdate(ump, MNT_WAIT);
    505 			}
    506 			if (error == 0)
    507 				UFS_WAPBL_END(mp);
    508 			if (error)
    509 				return (error);
    510 		}
    511 
    512 #ifdef WAPBL
    513 		if ((mp->mnt_flag & MNT_LOG) == 0) {
    514 			error = ffs_wapbl_stop(mp, mp->mnt_flag & MNT_FORCE);
    515 			if (error)
    516 				return error;
    517 		}
    518 #endif /* WAPBL */
    519 
    520 		if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
    521 			/*
    522 			 * Finish change from r/w to r/o
    523 			 */
    524 			fs->fs_ronly = 1;
    525 			fs->fs_fmod = 0;
    526 		}
    527 
    528 		if (mp->mnt_flag & MNT_RELOAD) {
    529 			error = ffs_reload(mp, l->l_cred, l);
    530 			if (error)
    531 				return (error);
    532 		}
    533 
    534 		if (fs->fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) {
    535 			/*
    536 			 * Changing from read-only to read/write
    537 			 */
    538 #ifndef QUOTA2
    539 			if (fs->fs_flags & FS_DOQUOTA2) {
    540 				ump->um_flags |= UFS_QUOTA2;
    541 				uprintf("%s: options QUOTA2 not enabled%s\n",
    542 				    mp->mnt_stat.f_mntonname,
    543 				    (mp->mnt_flag & MNT_FORCE) ? "" :
    544 				    ", not mounting");
    545 				return EINVAL;
    546 			}
    547 #endif
    548 			fs->fs_ronly = 0;
    549 			fs->fs_clean <<= 1;
    550 			fs->fs_fmod = 1;
    551 #ifdef WAPBL
    552 			if (fs->fs_flags & FS_DOWAPBL) {
    553 				printf("%s: replaying log to disk\n",
    554 				    mp->mnt_stat.f_mntonname);
    555 				KDASSERT(mp->mnt_wapbl_replay);
    556 				error = wapbl_replay_write(mp->mnt_wapbl_replay,
    557 							   devvp);
    558 				if (error) {
    559 					return error;
    560 				}
    561 				wapbl_replay_stop(mp->mnt_wapbl_replay);
    562 				fs->fs_clean = FS_WASCLEAN;
    563 			}
    564 #endif /* WAPBL */
    565 			if (fs->fs_snapinum[0] != 0)
    566 				ffs_snapshot_mount(mp);
    567 		}
    568 
    569 #ifdef WAPBL
    570 		error = ffs_wapbl_start(mp);
    571 		if (error)
    572 			return error;
    573 #endif /* WAPBL */
    574 
    575 #ifdef QUOTA2
    576 		if (!fs->fs_ronly) {
    577 			error = ffs_quota2_mount(mp);
    578 			if (error) {
    579 				return error;
    580 			}
    581 		}
    582 #endif
    583 
    584 		if ((mp->mnt_flag & MNT_DISCARD) && !(ump->um_discarddata))
    585 			ump->um_discarddata = ffs_discard_init(devvp, fs);
    586 
    587 		if (args->fspec == NULL)
    588 			return 0;
    589 	}
    590 
    591 	error = set_statvfs_info(path, UIO_USERSPACE, args->fspec,
    592 	    UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
    593 	if (error == 0)
    594 		(void)strncpy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname,
    595 		    sizeof(fs->fs_fsmnt));
    596 	fs->fs_flags &= ~FS_DOSOFTDEP;
    597 	if (fs->fs_fmod != 0) {	/* XXX */
    598 		int err;
    599 
    600 		fs->fs_fmod = 0;
    601 		if (fs->fs_clean & FS_WASCLEAN)
    602 			fs->fs_time = time_second;
    603 		else {
    604 			printf("%s: file system not clean (fs_clean=%#x); "
    605 			    "please fsck(8)\n", mp->mnt_stat.f_mntfromname,
    606 			    fs->fs_clean);
    607 			printf("%s: lost blocks %" PRId64 " files %d\n",
    608 			    mp->mnt_stat.f_mntfromname, fs->fs_pendingblocks,
    609 			    fs->fs_pendinginodes);
    610 		}
    611 		err = UFS_WAPBL_BEGIN(mp);
    612 		if (err == 0) {
    613 			(void) ffs_cgupdate(ump, MNT_WAIT);
    614 			UFS_WAPBL_END(mp);
    615 		}
    616 	}
    617 	if ((mp->mnt_flag & MNT_SOFTDEP) != 0) {
    618 		printf("%s: `-o softdep' is no longer supported, "
    619 		    "consider `-o log'\n", mp->mnt_stat.f_mntfromname);
    620 		mp->mnt_flag &= ~MNT_SOFTDEP;
    621 	}
    622 
    623 	return (error);
    624 
    625 fail:
    626 	vrele(devvp);
    627 	return (error);
    628 }
    629 
    630 /*
    631  * Reload all incore data for a filesystem (used after running fsck on
    632  * the root filesystem and finding things to fix). The filesystem must
    633  * be mounted read-only.
    634  *
    635  * Things to do to update the mount:
    636  *	1) invalidate all cached meta-data.
    637  *	2) re-read superblock from disk.
    638  *	3) re-read summary information from disk.
    639  *	4) invalidate all inactive vnodes.
    640  *	5) invalidate all cached file data.
    641  *	6) re-read inode data for all active vnodes.
    642  */
    643 int
    644 ffs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l)
    645 {
    646 	struct vnode *vp, *mvp, *devvp;
    647 	struct inode *ip;
    648 	void *space;
    649 	struct buf *bp;
    650 	struct fs *fs, *newfs;
    651 	struct dkwedge_info dkw;
    652 	int i, bsize, blks, error;
    653 	int32_t *lp;
    654 	struct ufsmount *ump;
    655 	daddr_t sblockloc;
    656 
    657 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
    658 		return (EINVAL);
    659 
    660 	ump = VFSTOUFS(mp);
    661 	/*
    662 	 * Step 1: invalidate all cached meta-data.
    663 	 */
    664 	devvp = ump->um_devvp;
    665 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    666 	error = vinvalbuf(devvp, 0, cred, l, 0, 0);
    667 	VOP_UNLOCK(devvp);
    668 	if (error)
    669 		panic("ffs_reload: dirty1");
    670 	/*
    671 	 * Step 2: re-read superblock from disk.
    672 	 */
    673 	fs = ump->um_fs;
    674 
    675 	/* XXX we don't handle possibility that superblock moved. */
    676 	error = bread(devvp, fs->fs_sblockloc / DEV_BSIZE, fs->fs_sbsize,
    677 		      NOCRED, 0, &bp);
    678 	if (error) {
    679 		return (error);
    680 	}
    681 	newfs = kmem_alloc(fs->fs_sbsize, KM_SLEEP);
    682 	memcpy(newfs, bp->b_data, fs->fs_sbsize);
    683 #ifdef FFS_EI
    684 	if (ump->um_flags & UFS_NEEDSWAP) {
    685 		ffs_sb_swap((struct fs*)bp->b_data, newfs);
    686 		fs->fs_flags |= FS_SWAPPED;
    687 	} else
    688 #endif
    689 		fs->fs_flags &= ~FS_SWAPPED;
    690 	if ((newfs->fs_magic != FS_UFS1_MAGIC &&
    691 	     newfs->fs_magic != FS_UFS2_MAGIC)||
    692 	     newfs->fs_bsize > MAXBSIZE ||
    693 	     newfs->fs_bsize < sizeof(struct fs)) {
    694 		brelse(bp, 0);
    695 		kmem_free(newfs, fs->fs_sbsize);
    696 		return (EIO);		/* XXX needs translation */
    697 	}
    698 	/* Store off old fs_sblockloc for fs_oldfscompat_read. */
    699 	sblockloc = fs->fs_sblockloc;
    700 	/*
    701 	 * Copy pointer fields back into superblock before copying in	XXX
    702 	 * new superblock. These should really be in the ufsmount.	XXX
    703 	 * Note that important parameters (eg fs_ncg) are unchanged.
    704 	 */
    705 	newfs->fs_csp = fs->fs_csp;
    706 	newfs->fs_maxcluster = fs->fs_maxcluster;
    707 	newfs->fs_contigdirs = fs->fs_contigdirs;
    708 	newfs->fs_ronly = fs->fs_ronly;
    709 	newfs->fs_active = fs->fs_active;
    710 	memcpy(fs, newfs, (u_int)fs->fs_sbsize);
    711 	brelse(bp, 0);
    712 	kmem_free(newfs, fs->fs_sbsize);
    713 
    714 	/* Recheck for apple UFS filesystem */
    715 	ump->um_flags &= ~UFS_ISAPPLEUFS;
    716 	/* First check to see if this is tagged as an Apple UFS filesystem
    717 	 * in the disklabel
    718 	 */
    719 	if (getdiskinfo(devvp, &dkw) == 0 &&
    720 	    strcmp(dkw.dkw_ptype, DKW_PTYPE_APPLEUFS) == 0)
    721 		ump->um_flags |= UFS_ISAPPLEUFS;
    722 #ifdef APPLE_UFS
    723 	else {
    724 		/* Manually look for an apple ufs label, and if a valid one
    725 		 * is found, then treat it like an Apple UFS filesystem anyway
    726 		 *
    727 		 * EINVAL is most probably a blocksize or alignment problem,
    728 		 * it is unlikely that this is an Apple UFS filesystem then.
    729 		 */
    730 		error = bread(devvp, (daddr_t)(APPLEUFS_LABEL_OFFSET / DEV_BSIZE),
    731 			APPLEUFS_LABEL_SIZE, cred, 0, &bp);
    732 		if (error && error != EINVAL) {
    733 			return (error);
    734 		}
    735 		if (error == 0) {
    736 			error = ffs_appleufs_validate(fs->fs_fsmnt,
    737 				(struct appleufslabel *)bp->b_data, NULL);
    738 			if (error == 0)
    739 				ump->um_flags |= UFS_ISAPPLEUFS;
    740 			brelse(bp, 0);
    741 		}
    742 		bp = NULL;
    743 	}
    744 #else
    745 	if (ump->um_flags & UFS_ISAPPLEUFS)
    746 		return (EIO);
    747 #endif
    748 
    749 	if (UFS_MPISAPPLEUFS(ump)) {
    750 		/* see comment about NeXT below */
    751 		ump->um_maxsymlinklen = APPLEUFS_MAXSYMLINKLEN;
    752 		ump->um_dirblksiz = APPLEUFS_DIRBLKSIZ;
    753 		mp->mnt_iflag |= IMNT_DTYPE;
    754 	} else {
    755 		ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
    756 		ump->um_dirblksiz = DIRBLKSIZ;
    757 		if (ump->um_maxsymlinklen > 0)
    758 			mp->mnt_iflag |= IMNT_DTYPE;
    759 		else
    760 			mp->mnt_iflag &= ~IMNT_DTYPE;
    761 	}
    762 	ffs_oldfscompat_read(fs, ump, sblockloc);
    763 
    764 	mutex_enter(&ump->um_lock);
    765 	ump->um_maxfilesize = fs->fs_maxfilesize;
    766 	if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
    767 		uprintf("%s: unknown ufs flags: 0x%08"PRIx32"%s\n",
    768 		    mp->mnt_stat.f_mntonname, fs->fs_flags,
    769 		    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
    770 		if ((mp->mnt_flag & MNT_FORCE) == 0) {
    771 			mutex_exit(&ump->um_lock);
    772 			return (EINVAL);
    773 		}
    774 	}
    775 	if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
    776 		fs->fs_pendingblocks = 0;
    777 		fs->fs_pendinginodes = 0;
    778 	}
    779 	mutex_exit(&ump->um_lock);
    780 
    781 	ffs_statvfs(mp, &mp->mnt_stat);
    782 	/*
    783 	 * Step 3: re-read summary information from disk.
    784 	 */
    785 	blks = howmany(fs->fs_cssize, fs->fs_fsize);
    786 	space = fs->fs_csp;
    787 	for (i = 0; i < blks; i += fs->fs_frag) {
    788 		bsize = fs->fs_bsize;
    789 		if (i + fs->fs_frag > blks)
    790 			bsize = (blks - i) * fs->fs_fsize;
    791 		error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), bsize,
    792 			      NOCRED, 0, &bp);
    793 		if (error) {
    794 			return (error);
    795 		}
    796 #ifdef FFS_EI
    797 		if (UFS_FSNEEDSWAP(fs))
    798 			ffs_csum_swap((struct csum *)bp->b_data,
    799 			    (struct csum *)space, bsize);
    800 		else
    801 #endif
    802 			memcpy(space, bp->b_data, (size_t)bsize);
    803 		space = (char *)space + bsize;
    804 		brelse(bp, 0);
    805 	}
    806 	if (fs->fs_snapinum[0] != 0)
    807 		ffs_snapshot_mount(mp);
    808 	/*
    809 	 * We no longer know anything about clusters per cylinder group.
    810 	 */
    811 	if (fs->fs_contigsumsize > 0) {
    812 		lp = fs->fs_maxcluster;
    813 		for (i = 0; i < fs->fs_ncg; i++)
    814 			*lp++ = fs->fs_contigsumsize;
    815 	}
    816 
    817 	/* Allocate a marker vnode. */
    818 	mvp = vnalloc(mp);
    819 	/*
    820 	 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
    821 	 * and vclean() can be called indirectly
    822 	 */
    823 	mutex_enter(&mntvnode_lock);
    824  loop:
    825 	for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
    826 		vmark(mvp, vp);
    827 		if (vp->v_mount != mp || vismarker(vp))
    828 			continue;
    829 		/*
    830 		 * Step 4: invalidate all inactive vnodes.
    831 		 */
    832 		if (vrecycle(vp, &mntvnode_lock, l)) {
    833 			mutex_enter(&mntvnode_lock);
    834 			(void)vunmark(mvp);
    835 			goto loop;
    836 		}
    837 		/*
    838 		 * Step 5: invalidate all cached file data.
    839 		 */
    840 		mutex_enter(vp->v_interlock);
    841 		mutex_exit(&mntvnode_lock);
    842 		if (vget(vp, LK_EXCLUSIVE)) {
    843 			(void)vunmark(mvp);
    844 			goto loop;
    845 		}
    846 		if (vinvalbuf(vp, 0, cred, l, 0, 0))
    847 			panic("ffs_reload: dirty2");
    848 		/*
    849 		 * Step 6: re-read inode data for all active vnodes.
    850 		 */
    851 		ip = VTOI(vp);
    852 		error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
    853 			      (int)fs->fs_bsize, NOCRED, 0, &bp);
    854 		if (error) {
    855 			vput(vp);
    856 			(void)vunmark(mvp);
    857 			break;
    858 		}
    859 		ffs_load_inode(bp, ip, fs, ip->i_number);
    860 		brelse(bp, 0);
    861 		vput(vp);
    862 		mutex_enter(&mntvnode_lock);
    863 	}
    864 	mutex_exit(&mntvnode_lock);
    865 	vnfree(mvp);
    866 	return (error);
    867 }
    868 
    869 /*
    870  * Possible superblock locations ordered from most to least likely.
    871  */
    872 static const int sblock_try[] = SBLOCKSEARCH;
    873 
    874 /*
    875  * Common code for mount and mountroot
    876  */
    877 int
    878 ffs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
    879 {
    880 	struct ufsmount *ump;
    881 	struct buf *bp;
    882 	struct fs *fs;
    883 	dev_t dev;
    884 	struct dkwedge_info dkw;
    885 	void *space;
    886 	daddr_t sblockloc, fsblockloc;
    887 	int blks, fstype;
    888 	int error, i, bsize, ronly, bset = 0;
    889 #ifdef FFS_EI
    890 	int needswap = 0;		/* keep gcc happy */
    891 #endif
    892 	int32_t *lp;
    893 	kauth_cred_t cred;
    894 	u_int32_t sbsize = 8192;	/* keep gcc happy*/
    895 	u_int32_t allocsbsize;
    896 	int32_t fsbsize;
    897 
    898 	dev = devvp->v_rdev;
    899 
    900 	cred = l ? l->l_cred : NOCRED;
    901 
    902 	/* Flush out any old buffers remaining from a previous use. */
    903 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    904 	error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0);
    905 	VOP_UNLOCK(devvp);
    906 	if (error)
    907 		return (error);
    908 
    909 	ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
    910 
    911 	bp = NULL;
    912 	ump = NULL;
    913 	fs = NULL;
    914 	sblockloc = 0;
    915 	fstype = 0;
    916 
    917 	error = fstrans_mount(mp);
    918 	if (error)
    919 		return error;
    920 
    921 	ump = kmem_zalloc(sizeof(*ump), KM_SLEEP);
    922 	mutex_init(&ump->um_lock, MUTEX_DEFAULT, IPL_NONE);
    923 	error = ffs_snapshot_init(ump);
    924 	if (error)
    925 		goto out;
    926 	ump->um_ops = &ffs_ufsops;
    927 
    928 #ifdef WAPBL
    929  sbagain:
    930 #endif
    931 	/*
    932 	 * Try reading the superblock in each of its possible locations.
    933 	 */
    934 	for (i = 0; ; i++) {
    935 		if (bp != NULL) {
    936 			brelse(bp, BC_NOCACHE);
    937 			bp = NULL;
    938 		}
    939 		if (sblock_try[i] == -1) {
    940 			error = EINVAL;
    941 			fs = NULL;
    942 			goto out;
    943 		}
    944 		error = bread(devvp, sblock_try[i] / DEV_BSIZE, SBLOCKSIZE, cred,
    945 			      0, &bp);
    946 		if (error) {
    947 			fs = NULL;
    948 			goto out;
    949 		}
    950 		fs = (struct fs*)bp->b_data;
    951 		fsblockloc = sblockloc = sblock_try[i];
    952 		if (fs->fs_magic == FS_UFS1_MAGIC) {
    953 			sbsize = fs->fs_sbsize;
    954 			fstype = UFS1;
    955 			fsbsize = fs->fs_bsize;
    956 #ifdef FFS_EI
    957 			needswap = 0;
    958 		} else if (fs->fs_magic == FS_UFS1_MAGIC_SWAPPED) {
    959 			sbsize = bswap32(fs->fs_sbsize);
    960 			fstype = UFS1;
    961 			fsbsize = bswap32(fs->fs_bsize);
    962 			needswap = 1;
    963 #endif
    964 		} else if (fs->fs_magic == FS_UFS2_MAGIC) {
    965 			sbsize = fs->fs_sbsize;
    966 			fstype = UFS2;
    967 			fsbsize = fs->fs_bsize;
    968 #ifdef FFS_EI
    969 			needswap = 0;
    970 		} else if (fs->fs_magic == FS_UFS2_MAGIC_SWAPPED) {
    971 			sbsize = bswap32(fs->fs_sbsize);
    972 			fstype = UFS2;
    973 			fsbsize = bswap32(fs->fs_bsize);
    974 			needswap = 1;
    975 #endif
    976 		} else
    977 			continue;
    978 
    979 
    980 		/* fs->fs_sblockloc isn't defined for old filesystems */
    981 		if (fstype == UFS1 && !(fs->fs_old_flags & FS_FLAGS_UPDATED)) {
    982 			if (sblockloc == SBLOCK_UFS2)
    983 				/*
    984 				 * This is likely to be the first alternate
    985 				 * in a filesystem with 64k blocks.
    986 				 * Don't use it.
    987 				 */
    988 				continue;
    989 			fsblockloc = sblockloc;
    990 		} else {
    991 			fsblockloc = fs->fs_sblockloc;
    992 #ifdef FFS_EI
    993 			if (needswap)
    994 				fsblockloc = bswap64(fsblockloc);
    995 #endif
    996 		}
    997 
    998 		/* Check we haven't found an alternate superblock */
    999 		if (fsblockloc != sblockloc)
   1000 			continue;
   1001 
   1002 		/* Validate size of superblock */
   1003 		if (sbsize > MAXBSIZE || sbsize < sizeof(struct fs))
   1004 			continue;
   1005 
   1006 		/* Check that we can handle the file system blocksize */
   1007 		if (fsbsize > MAXBSIZE) {
   1008 			printf("ffs_mountfs: block size (%d) > MAXBSIZE (%d)\n",
   1009 			    fsbsize, MAXBSIZE);
   1010 			continue;
   1011 		}
   1012 
   1013 		/* Ok seems to be a good superblock */
   1014 		break;
   1015 	}
   1016 
   1017 	fs = kmem_alloc((u_long)sbsize, KM_SLEEP);
   1018 	memcpy(fs, bp->b_data, sbsize);
   1019 	ump->um_fs = fs;
   1020 
   1021 #ifdef FFS_EI
   1022 	if (needswap) {
   1023 		ffs_sb_swap((struct fs*)bp->b_data, fs);
   1024 		fs->fs_flags |= FS_SWAPPED;
   1025 	} else
   1026 #endif
   1027 		fs->fs_flags &= ~FS_SWAPPED;
   1028 
   1029 #ifdef WAPBL
   1030 	if ((mp->mnt_wapbl_replay == 0) && (fs->fs_flags & FS_DOWAPBL)) {
   1031 		error = ffs_wapbl_replay_start(mp, fs, devvp);
   1032 		if (error && (mp->mnt_flag & MNT_FORCE) == 0)
   1033 			goto out;
   1034 		if (!error) {
   1035 			if (!ronly) {
   1036 				/* XXX fsmnt may be stale. */
   1037 				printf("%s: replaying log to disk\n",
   1038 				    fs->fs_fsmnt);
   1039 				error = wapbl_replay_write(mp->mnt_wapbl_replay,
   1040 				    devvp);
   1041 				if (error)
   1042 					goto out;
   1043 				wapbl_replay_stop(mp->mnt_wapbl_replay);
   1044 				fs->fs_clean = FS_WASCLEAN;
   1045 			} else {
   1046 				/* XXX fsmnt may be stale */
   1047 				printf("%s: replaying log to memory\n",
   1048 				    fs->fs_fsmnt);
   1049 			}
   1050 
   1051 			/* Force a re-read of the superblock */
   1052 			brelse(bp, BC_INVAL);
   1053 			bp = NULL;
   1054 			kmem_free(fs, sbsize);
   1055 			fs = NULL;
   1056 			goto sbagain;
   1057 		}
   1058 	}
   1059 #else /* !WAPBL */
   1060 	if ((fs->fs_flags & FS_DOWAPBL) && (mp->mnt_flag & MNT_FORCE) == 0) {
   1061 		error = EPERM;
   1062 		goto out;
   1063 	}
   1064 #endif /* !WAPBL */
   1065 
   1066 	ffs_oldfscompat_read(fs, ump, sblockloc);
   1067 	ump->um_maxfilesize = fs->fs_maxfilesize;
   1068 
   1069 	if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
   1070 		uprintf("%s: unknown ufs flags: 0x%08"PRIx32"%s\n",
   1071 		    mp->mnt_stat.f_mntonname, fs->fs_flags,
   1072 		    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
   1073 		if ((mp->mnt_flag & MNT_FORCE) == 0) {
   1074 			error = EINVAL;
   1075 			goto out;
   1076 		}
   1077 	}
   1078 
   1079 	if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
   1080 		fs->fs_pendingblocks = 0;
   1081 		fs->fs_pendinginodes = 0;
   1082 	}
   1083 
   1084 	ump->um_fstype = fstype;
   1085 	if (fs->fs_sbsize < SBLOCKSIZE)
   1086 		brelse(bp, BC_INVAL);
   1087 	else
   1088 		brelse(bp, 0);
   1089 	bp = NULL;
   1090 
   1091 	/* First check to see if this is tagged as an Apple UFS filesystem
   1092 	 * in the disklabel
   1093 	 */
   1094 	if (getdiskinfo(devvp, &dkw) == 0 &&
   1095 	    strcmp(dkw.dkw_ptype, DKW_PTYPE_APPLEUFS) == 0)
   1096 		ump->um_flags |= UFS_ISAPPLEUFS;
   1097 #ifdef APPLE_UFS
   1098 	else {
   1099 		/* Manually look for an apple ufs label, and if a valid one
   1100 		 * is found, then treat it like an Apple UFS filesystem anyway
   1101 		 */
   1102 		error = bread(devvp, (daddr_t)(APPLEUFS_LABEL_OFFSET / DEV_BSIZE),
   1103 			APPLEUFS_LABEL_SIZE, cred, 0, &bp);
   1104 		if (error)
   1105 			goto out;
   1106 		error = ffs_appleufs_validate(fs->fs_fsmnt,
   1107 			(struct appleufslabel *)bp->b_data, NULL);
   1108 		if (error == 0) {
   1109 			ump->um_flags |= UFS_ISAPPLEUFS;
   1110 		}
   1111 		brelse(bp, 0);
   1112 		bp = NULL;
   1113 	}
   1114 #else
   1115 	if (ump->um_flags & UFS_ISAPPLEUFS) {
   1116 		error = EINVAL;
   1117 		goto out;
   1118 	}
   1119 #endif
   1120 
   1121 #if 0
   1122 /*
   1123  * XXX This code changes the behaviour of mounting dirty filesystems, to
   1124  * XXX require "mount -f ..." to mount them.  This doesn't match what
   1125  * XXX mount(8) describes and is disabled for now.
   1126  */
   1127 	/*
   1128 	 * If the file system is not clean, don't allow it to be mounted
   1129 	 * unless MNT_FORCE is specified.  (Note: MNT_FORCE is always set
   1130 	 * for the root file system.)
   1131 	 */
   1132 	if (fs->fs_flags & FS_DOWAPBL) {
   1133 		/*
   1134 		 * wapbl normally expects to be FS_WASCLEAN when the FS_DOWAPBL
   1135 		 * bit is set, although there's a window in unmount where it
   1136 		 * could be FS_ISCLEAN
   1137 		 */
   1138 		if ((mp->mnt_flag & MNT_FORCE) == 0 &&
   1139 		    (fs->fs_clean & (FS_WASCLEAN | FS_ISCLEAN)) == 0) {
   1140 			error = EPERM;
   1141 			goto out;
   1142 		}
   1143 	} else
   1144 		if ((fs->fs_clean & FS_ISCLEAN) == 0 &&
   1145 		    (mp->mnt_flag & MNT_FORCE) == 0) {
   1146 			error = EPERM;
   1147 			goto out;
   1148 		}
   1149 #endif
   1150 
   1151 	/*
   1152 	 * verify that we can access the last block in the fs
   1153 	 * if we're mounting read/write.
   1154 	 */
   1155 
   1156 	if (!ronly) {
   1157 		error = bread(devvp, fsbtodb(fs, fs->fs_size - 1), fs->fs_fsize,
   1158 		    cred, 0, &bp);
   1159 		if (bp->b_bcount != fs->fs_fsize)
   1160 			error = EINVAL;
   1161 		if (error) {
   1162 			bset = BC_INVAL;
   1163 			goto out;
   1164 		}
   1165 		brelse(bp, BC_INVAL);
   1166 		bp = NULL;
   1167 	}
   1168 
   1169 	fs->fs_ronly = ronly;
   1170 	/* Don't bump fs_clean if we're replaying journal */
   1171 	if (!((fs->fs_flags & FS_DOWAPBL) && (fs->fs_clean & FS_WASCLEAN)))
   1172 		if (ronly == 0) {
   1173 			fs->fs_clean <<= 1;
   1174 			fs->fs_fmod = 1;
   1175 		}
   1176 	bsize = fs->fs_cssize;
   1177 	blks = howmany(bsize, fs->fs_fsize);
   1178 	if (fs->fs_contigsumsize > 0)
   1179 		bsize += fs->fs_ncg * sizeof(int32_t);
   1180 	bsize += fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1181 	allocsbsize = bsize;
   1182 	space = kmem_alloc((u_long)allocsbsize, KM_SLEEP);
   1183 	fs->fs_csp = space;
   1184 	for (i = 0; i < blks; i += fs->fs_frag) {
   1185 		bsize = fs->fs_bsize;
   1186 		if (i + fs->fs_frag > blks)
   1187 			bsize = (blks - i) * fs->fs_fsize;
   1188 		error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), bsize,
   1189 			      cred, 0, &bp);
   1190 		if (error) {
   1191 			kmem_free(fs->fs_csp, allocsbsize);
   1192 			goto out;
   1193 		}
   1194 #ifdef FFS_EI
   1195 		if (needswap)
   1196 			ffs_csum_swap((struct csum *)bp->b_data,
   1197 				(struct csum *)space, bsize);
   1198 		else
   1199 #endif
   1200 			memcpy(space, bp->b_data, (u_int)bsize);
   1201 
   1202 		space = (char *)space + bsize;
   1203 		brelse(bp, 0);
   1204 		bp = NULL;
   1205 	}
   1206 	if (fs->fs_contigsumsize > 0) {
   1207 		fs->fs_maxcluster = lp = space;
   1208 		for (i = 0; i < fs->fs_ncg; i++)
   1209 			*lp++ = fs->fs_contigsumsize;
   1210 		space = lp;
   1211 	}
   1212 	bsize = fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1213 	fs->fs_contigdirs = space;
   1214 	space = (char *)space + bsize;
   1215 	memset(fs->fs_contigdirs, 0, bsize);
   1216 		/* Compatibility for old filesystems - XXX */
   1217 	if (fs->fs_avgfilesize <= 0)
   1218 		fs->fs_avgfilesize = AVFILESIZ;
   1219 	if (fs->fs_avgfpdir <= 0)
   1220 		fs->fs_avgfpdir = AFPDIR;
   1221 	fs->fs_active = NULL;
   1222 	mp->mnt_data = ump;
   1223 	mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
   1224 	mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FFS);
   1225 	mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
   1226 	mp->mnt_stat.f_namemax = FFS_MAXNAMLEN;
   1227 	if (UFS_MPISAPPLEUFS(ump)) {
   1228 		/* NeXT used to keep short symlinks in the inode even
   1229 		 * when using FS_42INODEFMT.  In that case fs->fs_maxsymlinklen
   1230 		 * is probably -1, but we still need to be able to identify
   1231 		 * short symlinks.
   1232 		 */
   1233 		ump->um_maxsymlinklen = APPLEUFS_MAXSYMLINKLEN;
   1234 		ump->um_dirblksiz = APPLEUFS_DIRBLKSIZ;
   1235 		mp->mnt_iflag |= IMNT_DTYPE;
   1236 	} else {
   1237 		ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
   1238 		ump->um_dirblksiz = DIRBLKSIZ;
   1239 		if (ump->um_maxsymlinklen > 0)
   1240 			mp->mnt_iflag |= IMNT_DTYPE;
   1241 		else
   1242 			mp->mnt_iflag &= ~IMNT_DTYPE;
   1243 	}
   1244 	mp->mnt_fs_bshift = fs->fs_bshift;
   1245 	mp->mnt_dev_bshift = DEV_BSHIFT;	/* XXX */
   1246 	mp->mnt_flag |= MNT_LOCAL;
   1247 	mp->mnt_iflag |= IMNT_MPSAFE;
   1248 #ifdef FFS_EI
   1249 	if (needswap)
   1250 		ump->um_flags |= UFS_NEEDSWAP;
   1251 #endif
   1252 	ump->um_mountp = mp;
   1253 	ump->um_dev = dev;
   1254 	ump->um_devvp = devvp;
   1255 	ump->um_nindir = fs->fs_nindir;
   1256 	ump->um_lognindir = ffs(fs->fs_nindir) - 1;
   1257 	ump->um_bptrtodb = fs->fs_fshift - DEV_BSHIFT;
   1258 	ump->um_seqinc = fs->fs_frag;
   1259 	for (i = 0; i < MAXQUOTAS; i++)
   1260 		ump->um_quotas[i] = NULLVP;
   1261 	devvp->v_specmountpoint = mp;
   1262 
   1263 	/* Before we start WAPBL or touch any snapshots, adjust maxphys */
   1264 	ufs_update_maxphys(mp);
   1265 
   1266 	if (ronly == 0 && fs->fs_snapinum[0] != 0)
   1267 		ffs_snapshot_mount(mp);
   1268 
   1269 #ifdef WAPBL
   1270 	if (!ronly) {
   1271 		KDASSERT(fs->fs_ronly == 0);
   1272 		/*
   1273 		 * ffs_wapbl_start() needs mp->mnt_stat initialised if it
   1274 		 * needs to create a new log file in-filesystem.
   1275 		 */
   1276 		ffs_statvfs(mp, &mp->mnt_stat);
   1277 
   1278 		error = ffs_wapbl_start(mp);
   1279 		if (error) {
   1280 			kmem_free(fs->fs_csp, allocsbsize);
   1281 			goto out;
   1282 		}
   1283 	}
   1284 #endif /* WAPBL */
   1285 	if (ronly == 0) {
   1286 #ifdef QUOTA2
   1287 		error = ffs_quota2_mount(mp);
   1288 		if (error) {
   1289 			kmem_free(fs->fs_csp, allocsbsize);
   1290 			goto out;
   1291 		}
   1292 #else
   1293 		if (fs->fs_flags & FS_DOQUOTA2) {
   1294 			ump->um_flags |= UFS_QUOTA2;
   1295 			uprintf("%s: options QUOTA2 not enabled%s\n",
   1296 			    mp->mnt_stat.f_mntonname,
   1297 			    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
   1298 			if ((mp->mnt_flag & MNT_FORCE) == 0) {
   1299 				error = EINVAL;
   1300 				kmem_free(fs->fs_csp, allocsbsize);
   1301 				goto out;
   1302 			}
   1303 		}
   1304 #endif
   1305 	 }
   1306 #ifdef UFS_EXTATTR
   1307 	/*
   1308 	 * Initialize file-backed extended attributes on UFS1 file
   1309 	 * systems.
   1310 	 */
   1311 	if (ump->um_fstype == UFS1)
   1312 		ufs_extattr_uepm_init(&ump->um_extattr);
   1313 #endif /* UFS_EXTATTR */
   1314 
   1315 	if (mp->mnt_flag & MNT_DISCARD)
   1316 		ump->um_discarddata = ffs_discard_init(devvp, fs);
   1317 
   1318 	return (0);
   1319 out:
   1320 #ifdef WAPBL
   1321 	if (mp->mnt_wapbl_replay) {
   1322 		wapbl_replay_stop(mp->mnt_wapbl_replay);
   1323 		wapbl_replay_free(mp->mnt_wapbl_replay);
   1324 		mp->mnt_wapbl_replay = 0;
   1325 	}
   1326 #endif
   1327 
   1328 	fstrans_unmount(mp);
   1329 	if (fs)
   1330 		kmem_free(fs, fs->fs_sbsize);
   1331 	devvp->v_specmountpoint = NULL;
   1332 	if (bp)
   1333 		brelse(bp, bset);
   1334 	if (ump) {
   1335 		if (ump->um_oldfscompat)
   1336 			kmem_free(ump->um_oldfscompat, 512 + 3*sizeof(int32_t));
   1337 		mutex_destroy(&ump->um_lock);
   1338 		kmem_free(ump, sizeof(*ump));
   1339 		mp->mnt_data = NULL;
   1340 	}
   1341 	return (error);
   1342 }
   1343 
   1344 /*
   1345  * Sanity checks for loading old filesystem superblocks.
   1346  * See ffs_oldfscompat_write below for unwound actions.
   1347  *
   1348  * XXX - Parts get retired eventually.
   1349  * Unfortunately new bits get added.
   1350  */
   1351 static void
   1352 ffs_oldfscompat_read(struct fs *fs, struct ufsmount *ump, daddr_t sblockloc)
   1353 {
   1354 	off_t maxfilesize;
   1355 	int32_t *extrasave;
   1356 
   1357 	if ((fs->fs_magic != FS_UFS1_MAGIC) ||
   1358 	    (fs->fs_old_flags & FS_FLAGS_UPDATED))
   1359 		return;
   1360 
   1361 	if (!ump->um_oldfscompat)
   1362 		ump->um_oldfscompat = kmem_alloc(512 + 3*sizeof(int32_t),
   1363 		    KM_SLEEP);
   1364 
   1365 	memcpy(ump->um_oldfscompat, &fs->fs_old_postbl_start, 512);
   1366 	extrasave = ump->um_oldfscompat;
   1367 	extrasave += 512/sizeof(int32_t);
   1368 	extrasave[0] = fs->fs_old_npsect;
   1369 	extrasave[1] = fs->fs_old_interleave;
   1370 	extrasave[2] = fs->fs_old_trackskew;
   1371 
   1372 	/* These fields will be overwritten by their
   1373 	 * original values in fs_oldfscompat_write, so it is harmless
   1374 	 * to modify them here.
   1375 	 */
   1376 	fs->fs_cstotal.cs_ndir = fs->fs_old_cstotal.cs_ndir;
   1377 	fs->fs_cstotal.cs_nbfree = fs->fs_old_cstotal.cs_nbfree;
   1378 	fs->fs_cstotal.cs_nifree = fs->fs_old_cstotal.cs_nifree;
   1379 	fs->fs_cstotal.cs_nffree = fs->fs_old_cstotal.cs_nffree;
   1380 
   1381 	fs->fs_maxbsize = fs->fs_bsize;
   1382 	fs->fs_time = fs->fs_old_time;
   1383 	fs->fs_size = fs->fs_old_size;
   1384 	fs->fs_dsize = fs->fs_old_dsize;
   1385 	fs->fs_csaddr = fs->fs_old_csaddr;
   1386 	fs->fs_sblockloc = sblockloc;
   1387 
   1388 	fs->fs_flags = fs->fs_old_flags | (fs->fs_flags & FS_INTERNAL);
   1389 
   1390 	if (fs->fs_old_postblformat == FS_42POSTBLFMT) {
   1391 		fs->fs_old_nrpos = 8;
   1392 		fs->fs_old_npsect = fs->fs_old_nsect;
   1393 		fs->fs_old_interleave = 1;
   1394 		fs->fs_old_trackskew = 0;
   1395 	}
   1396 
   1397 	if (fs->fs_old_inodefmt < FS_44INODEFMT) {
   1398 		fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
   1399 		fs->fs_qbmask = ~fs->fs_bmask;
   1400 		fs->fs_qfmask = ~fs->fs_fmask;
   1401 	}
   1402 
   1403 	maxfilesize = (u_int64_t)0x80000000 * fs->fs_bsize - 1;
   1404 	if (fs->fs_maxfilesize > maxfilesize)
   1405 		fs->fs_maxfilesize = maxfilesize;
   1406 
   1407 	/* Compatibility for old filesystems */
   1408 	if (fs->fs_avgfilesize <= 0)
   1409 		fs->fs_avgfilesize = AVFILESIZ;
   1410 	if (fs->fs_avgfpdir <= 0)
   1411 		fs->fs_avgfpdir = AFPDIR;
   1412 
   1413 #if 0
   1414 	if (bigcgs) {
   1415 		fs->fs_save_cgsize = fs->fs_cgsize;
   1416 		fs->fs_cgsize = fs->fs_bsize;
   1417 	}
   1418 #endif
   1419 }
   1420 
   1421 /*
   1422  * Unwinding superblock updates for old filesystems.
   1423  * See ffs_oldfscompat_read above for details.
   1424  *
   1425  * XXX - Parts get retired eventually.
   1426  * Unfortunately new bits get added.
   1427  */
   1428 static void
   1429 ffs_oldfscompat_write(struct fs *fs, struct ufsmount *ump)
   1430 {
   1431 	int32_t *extrasave;
   1432 
   1433 	if ((fs->fs_magic != FS_UFS1_MAGIC) ||
   1434 	    (fs->fs_old_flags & FS_FLAGS_UPDATED))
   1435 		return;
   1436 
   1437 	fs->fs_old_time = fs->fs_time;
   1438 	fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir;
   1439 	fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree;
   1440 	fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree;
   1441 	fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree;
   1442 	fs->fs_old_flags = fs->fs_flags;
   1443 
   1444 #if 0
   1445 	if (bigcgs) {
   1446 		fs->fs_cgsize = fs->fs_save_cgsize;
   1447 	}
   1448 #endif
   1449 
   1450 	memcpy(&fs->fs_old_postbl_start, ump->um_oldfscompat, 512);
   1451 	extrasave = ump->um_oldfscompat;
   1452 	extrasave += 512/sizeof(int32_t);
   1453 	fs->fs_old_npsect = extrasave[0];
   1454 	fs->fs_old_interleave = extrasave[1];
   1455 	fs->fs_old_trackskew = extrasave[2];
   1456 
   1457 }
   1458 
   1459 /*
   1460  * unmount vfs operation
   1461  */
   1462 int
   1463 ffs_unmount(struct mount *mp, int mntflags)
   1464 {
   1465 	struct lwp *l = curlwp;
   1466 	struct ufsmount *ump = VFSTOUFS(mp);
   1467 	struct fs *fs = ump->um_fs;
   1468 	int error, flags;
   1469 	u_int32_t bsize;
   1470 #ifdef WAPBL
   1471 	extern int doforce;
   1472 #endif
   1473 
   1474 	if (ump->um_discarddata) {
   1475 		ffs_discard_finish(ump->um_discarddata, mntflags);
   1476 		ump->um_discarddata = NULL;
   1477 	}
   1478 
   1479 	flags = 0;
   1480 	if (mntflags & MNT_FORCE)
   1481 		flags |= FORCECLOSE;
   1482 	if ((error = ffs_flushfiles(mp, flags, l)) != 0)
   1483 		return (error);
   1484 	error = UFS_WAPBL_BEGIN(mp);
   1485 	if (error == 0)
   1486 		if (fs->fs_ronly == 0 &&
   1487 		    ffs_cgupdate(ump, MNT_WAIT) == 0 &&
   1488 		    fs->fs_clean & FS_WASCLEAN) {
   1489 			fs->fs_clean = FS_ISCLEAN;
   1490 			fs->fs_fmod = 0;
   1491 			(void) ffs_sbupdate(ump, MNT_WAIT);
   1492 		}
   1493 	if (error == 0)
   1494 		UFS_WAPBL_END(mp);
   1495 #ifdef WAPBL
   1496 	KASSERT(!(mp->mnt_wapbl_replay && mp->mnt_wapbl));
   1497 	if (mp->mnt_wapbl_replay) {
   1498 		KDASSERT(fs->fs_ronly);
   1499 		wapbl_replay_stop(mp->mnt_wapbl_replay);
   1500 		wapbl_replay_free(mp->mnt_wapbl_replay);
   1501 		mp->mnt_wapbl_replay = 0;
   1502 	}
   1503 	error = ffs_wapbl_stop(mp, doforce && (mntflags & MNT_FORCE));
   1504 	if (error) {
   1505 		return error;
   1506 	}
   1507 #endif /* WAPBL */
   1508 
   1509 	if (ump->um_devvp->v_type != VBAD)
   1510 		ump->um_devvp->v_specmountpoint = NULL;
   1511 	vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1512 	(void)VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD | FWRITE,
   1513 		NOCRED);
   1514 	vput(ump->um_devvp);
   1515 
   1516 	bsize = fs->fs_cssize;
   1517 	if (fs->fs_contigsumsize > 0)
   1518 		bsize += fs->fs_ncg * sizeof(int32_t);
   1519 	bsize += fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1520 	kmem_free(fs->fs_csp, bsize);
   1521 
   1522 	kmem_free(fs, fs->fs_sbsize);
   1523 	if (ump->um_oldfscompat != NULL)
   1524 		kmem_free(ump->um_oldfscompat, 512 + 3*sizeof(int32_t));
   1525 	mutex_destroy(&ump->um_lock);
   1526 	ffs_snapshot_fini(ump);
   1527 	kmem_free(ump, sizeof(*ump));
   1528 	mp->mnt_data = NULL;
   1529 	mp->mnt_flag &= ~MNT_LOCAL;
   1530 	fstrans_unmount(mp);
   1531 	return (0);
   1532 }
   1533 
   1534 /*
   1535  * Flush out all the files in a filesystem.
   1536  */
   1537 int
   1538 ffs_flushfiles(struct mount *mp, int flags, struct lwp *l)
   1539 {
   1540 	extern int doforce;
   1541 	struct ufsmount *ump;
   1542 	int error;
   1543 
   1544 	if (!doforce)
   1545 		flags &= ~FORCECLOSE;
   1546 	ump = VFSTOUFS(mp);
   1547 #ifdef QUOTA
   1548 	if ((error = quota1_umount(mp, flags)) != 0)
   1549 		return (error);
   1550 #endif
   1551 #ifdef QUOTA2
   1552 	if ((error = quota2_umount(mp, flags)) != 0)
   1553 		return (error);
   1554 #endif
   1555 #ifdef UFS_EXTATTR
   1556 	if (ump->um_fstype == UFS1) {
   1557 		if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)
   1558 			ufs_extattr_stop(mp, l);
   1559 		if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED)
   1560 			ufs_extattr_uepm_destroy(&ump->um_extattr);
   1561 	}
   1562 #endif
   1563 	if ((error = vflush(mp, 0, SKIPSYSTEM | flags)) != 0)
   1564 		return (error);
   1565 	ffs_snapshot_unmount(mp);
   1566 	/*
   1567 	 * Flush all the files.
   1568 	 */
   1569 	error = vflush(mp, NULLVP, flags);
   1570 	if (error)
   1571 		return (error);
   1572 	/*
   1573 	 * Flush filesystem metadata.
   1574 	 */
   1575 	vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1576 	error = VOP_FSYNC(ump->um_devvp, l->l_cred, FSYNC_WAIT, 0, 0);
   1577 	VOP_UNLOCK(ump->um_devvp);
   1578 	if (flags & FORCECLOSE) /* XXXDBJ */
   1579 		error = 0;
   1580 
   1581 #ifdef WAPBL
   1582 	if (error)
   1583 		return error;
   1584 	if (mp->mnt_wapbl) {
   1585 		error = wapbl_flush(mp->mnt_wapbl, 1);
   1586 		if (flags & FORCECLOSE)
   1587 			error = 0;
   1588 	}
   1589 #endif
   1590 
   1591 	return (error);
   1592 }
   1593 
   1594 /*
   1595  * Get file system statistics.
   1596  */
   1597 int
   1598 ffs_statvfs(struct mount *mp, struct statvfs *sbp)
   1599 {
   1600 	struct ufsmount *ump;
   1601 	struct fs *fs;
   1602 
   1603 	ump = VFSTOUFS(mp);
   1604 	fs = ump->um_fs;
   1605 	mutex_enter(&ump->um_lock);
   1606 	sbp->f_bsize = fs->fs_bsize;
   1607 	sbp->f_frsize = fs->fs_fsize;
   1608 	sbp->f_iosize = fs->fs_bsize;
   1609 	sbp->f_blocks = fs->fs_dsize;
   1610 	sbp->f_bfree = blkstofrags(fs, fs->fs_cstotal.cs_nbfree) +
   1611 	    fs->fs_cstotal.cs_nffree + dbtofsb(fs, fs->fs_pendingblocks);
   1612 	sbp->f_bresvd = ((u_int64_t) fs->fs_dsize * (u_int64_t)
   1613 	    fs->fs_minfree) / (u_int64_t) 100;
   1614 	if (sbp->f_bfree > sbp->f_bresvd)
   1615 		sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd;
   1616 	else
   1617 		sbp->f_bavail = 0;
   1618 	sbp->f_files =  fs->fs_ncg * fs->fs_ipg - UFS_ROOTINO;
   1619 	sbp->f_ffree = fs->fs_cstotal.cs_nifree + fs->fs_pendinginodes;
   1620 	sbp->f_favail = sbp->f_ffree;
   1621 	sbp->f_fresvd = 0;
   1622 	mutex_exit(&ump->um_lock);
   1623 	copy_statvfs_info(sbp, mp);
   1624 
   1625 	return (0);
   1626 }
   1627 
   1628 /*
   1629  * Go through the disk queues to initiate sandbagged IO;
   1630  * go through the inodes to write those that have been modified;
   1631  * initiate the writing of the super block if it has been modified.
   1632  *
   1633  * Note: we are always called with the filesystem marked `MPBUSY'.
   1634  */
   1635 int
   1636 ffs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
   1637 {
   1638 	struct vnode *vp, *mvp, *nvp;
   1639 	struct inode *ip;
   1640 	struct ufsmount *ump = VFSTOUFS(mp);
   1641 	struct fs *fs;
   1642 	int error, allerror = 0;
   1643 	bool is_suspending;
   1644 
   1645 	fs = ump->um_fs;
   1646 	if (fs->fs_fmod != 0 && fs->fs_ronly != 0) {		/* XXX */
   1647 		printf("fs = %s\n", fs->fs_fsmnt);
   1648 		panic("update: rofs mod");
   1649 	}
   1650 
   1651 	/* Allocate a marker vnode. */
   1652 	mvp = vnalloc(mp);
   1653 
   1654 	fstrans_start(mp, FSTRANS_SHARED);
   1655 	is_suspending = (fstrans_getstate(mp) == FSTRANS_SUSPENDING);
   1656 	/*
   1657 	 * Write back each (modified) inode.
   1658 	 */
   1659 	mutex_enter(&mntvnode_lock);
   1660 loop:
   1661 	/*
   1662 	 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
   1663 	 * and vclean() can be called indirectly
   1664 	 */
   1665 	for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) {
   1666 		nvp = TAILQ_NEXT(vp, v_mntvnodes);
   1667 		/*
   1668 		 * If the vnode that we are about to sync is no longer
   1669 		 * associated with this mount point, start over.
   1670 		 */
   1671 		if (vp->v_mount != mp)
   1672 			goto loop;
   1673 		/*
   1674 		 * Don't interfere with concurrent scans of this FS.
   1675 		 */
   1676 		if (vismarker(vp))
   1677 			continue;
   1678 		mutex_enter(vp->v_interlock);
   1679 		ip = VTOI(vp);
   1680 
   1681 		/*
   1682 		 * Skip the vnode/inode if inaccessible.
   1683 		 */
   1684 		if (ip == NULL || (vp->v_iflag & (VI_XLOCK | VI_CLEAN)) != 0 ||
   1685 		    vp->v_type == VNON) {
   1686 			mutex_exit(vp->v_interlock);
   1687 			continue;
   1688 		}
   1689 
   1690 		/*
   1691 		 * We deliberately update inode times here.  This will
   1692 		 * prevent a massive queue of updates accumulating, only
   1693 		 * to be handled by a call to unmount.
   1694 		 *
   1695 		 * XXX It would be better to have the syncer trickle these
   1696 		 * out.  Adjustment needed to allow registering vnodes for
   1697 		 * sync when the vnode is clean, but the inode dirty.  Or
   1698 		 * have ufs itself trickle out inode updates.
   1699 		 *
   1700 		 * If doing a lazy sync, we don't care about metadata or
   1701 		 * data updates, because they are handled by each vnode's
   1702 		 * synclist entry.  In this case we are only interested in
   1703 		 * writing back modified inodes.
   1704 		 */
   1705 		if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE |
   1706 		    IN_MODIFY | IN_MODIFIED | IN_ACCESSED)) == 0 &&
   1707 		    (waitfor == MNT_LAZY || (LIST_EMPTY(&vp->v_dirtyblkhd) &&
   1708 		    UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) {
   1709 			mutex_exit(vp->v_interlock);
   1710 			continue;
   1711 		}
   1712 		if (vp->v_type == VBLK && is_suspending) {
   1713 			mutex_exit(vp->v_interlock);
   1714 			continue;
   1715 		}
   1716 		vmark(mvp, vp);
   1717 		mutex_exit(&mntvnode_lock);
   1718 		error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT);
   1719 		if (error) {
   1720 			mutex_enter(&mntvnode_lock);
   1721 			nvp = vunmark(mvp);
   1722 			if (error == ENOENT) {
   1723 				goto loop;
   1724 			}
   1725 			continue;
   1726 		}
   1727 		if (waitfor == MNT_LAZY) {
   1728 			error = UFS_WAPBL_BEGIN(vp->v_mount);
   1729 			if (!error) {
   1730 				error = ffs_update(vp, NULL, NULL,
   1731 				    UPDATE_CLOSE);
   1732 				UFS_WAPBL_END(vp->v_mount);
   1733 			}
   1734 		} else {
   1735 			error = VOP_FSYNC(vp, cred, FSYNC_NOLOG |
   1736 			    (waitfor == MNT_WAIT ? FSYNC_WAIT : 0), 0, 0);
   1737 		}
   1738 		if (error)
   1739 			allerror = error;
   1740 		vput(vp);
   1741 		mutex_enter(&mntvnode_lock);
   1742 		nvp = vunmark(mvp);
   1743 	}
   1744 	mutex_exit(&mntvnode_lock);
   1745 	/*
   1746 	 * Force stale file system control information to be flushed.
   1747 	 */
   1748 	if (waitfor != MNT_LAZY && (ump->um_devvp->v_numoutput > 0 ||
   1749 	    !LIST_EMPTY(&ump->um_devvp->v_dirtyblkhd))) {
   1750 		vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1751 		if ((error = VOP_FSYNC(ump->um_devvp, cred,
   1752 		    (waitfor == MNT_WAIT ? FSYNC_WAIT : 0) | FSYNC_NOLOG,
   1753 		    0, 0)) != 0)
   1754 			allerror = error;
   1755 		VOP_UNLOCK(ump->um_devvp);
   1756 		if (allerror == 0 && waitfor == MNT_WAIT && !mp->mnt_wapbl) {
   1757 			mutex_enter(&mntvnode_lock);
   1758 			goto loop;
   1759 		}
   1760 	}
   1761 #if defined(QUOTA) || defined(QUOTA2)
   1762 	qsync(mp);
   1763 #endif
   1764 	/*
   1765 	 * Write back modified superblock.
   1766 	 */
   1767 	if (fs->fs_fmod != 0) {
   1768 		fs->fs_fmod = 0;
   1769 		fs->fs_time = time_second;
   1770 		error = UFS_WAPBL_BEGIN(mp);
   1771 		if (error)
   1772 			allerror = error;
   1773 		else {
   1774 			if ((error = ffs_cgupdate(ump, waitfor)))
   1775 				allerror = error;
   1776 			UFS_WAPBL_END(mp);
   1777 		}
   1778 	}
   1779 
   1780 #ifdef WAPBL
   1781 	if (mp->mnt_wapbl) {
   1782 		error = wapbl_flush(mp->mnt_wapbl, 0);
   1783 		if (error)
   1784 			allerror = error;
   1785 	}
   1786 #endif
   1787 
   1788 	fstrans_done(mp);
   1789 	vnfree(mvp);
   1790 	return (allerror);
   1791 }
   1792 
   1793 /*
   1794  * Look up a FFS dinode number to find its incore vnode, otherwise read it
   1795  * in from disk.  If it is in core, wait for the lock bit to clear, then
   1796  * return the inode locked.  Detection and handling of mount points must be
   1797  * done by the calling routine.
   1798  */
   1799 int
   1800 ffs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
   1801 {
   1802 	struct fs *fs;
   1803 	struct inode *ip;
   1804 	struct ufsmount *ump;
   1805 	struct buf *bp;
   1806 	struct vnode *vp;
   1807 	dev_t dev;
   1808 	int error;
   1809 
   1810 	ump = VFSTOUFS(mp);
   1811 	dev = ump->um_dev;
   1812 
   1813  retry:
   1814 	if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL)
   1815 		return (0);
   1816 
   1817 	/* Allocate a new vnode/inode. */
   1818 	error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, NULL, &vp);
   1819 	if (error) {
   1820 		*vpp = NULL;
   1821 		return (error);
   1822 	}
   1823 	ip = pool_cache_get(ffs_inode_cache, PR_WAITOK);
   1824 
   1825 	/*
   1826 	 * If someone beat us to it, put back the freshly allocated
   1827 	 * vnode/inode pair and retry.
   1828 	 */
   1829 	mutex_enter(&ufs_hashlock);
   1830 	if (ufs_ihashget(dev, ino, 0) != NULL) {
   1831 		mutex_exit(&ufs_hashlock);
   1832 		ungetnewvnode(vp);
   1833 		pool_cache_put(ffs_inode_cache, ip);
   1834 		goto retry;
   1835 	}
   1836 
   1837 	vp->v_vflag |= VV_LOCKSWORK;
   1838 
   1839 	/*
   1840 	 * XXX MFS ends up here, too, to allocate an inode.  Should we
   1841 	 * XXX create another pool for MFS inodes?
   1842 	 */
   1843 
   1844 	memset(ip, 0, sizeof(struct inode));
   1845 	vp->v_data = ip;
   1846 	ip->i_vnode = vp;
   1847 	ip->i_ump = ump;
   1848 	ip->i_fs = fs = ump->um_fs;
   1849 	ip->i_dev = dev;
   1850 	ip->i_number = ino;
   1851 #if defined(QUOTA) || defined(QUOTA2)
   1852 	ufsquota_init(ip);
   1853 #endif
   1854 
   1855 	/*
   1856 	 * Initialize genfs node, we might proceed to destroy it in
   1857 	 * error branches.
   1858 	 */
   1859 	genfs_node_init(vp, &ffs_genfsops);
   1860 
   1861 	/*
   1862 	 * Put it onto its hash chain and lock it so that other requests for
   1863 	 * this inode will block if they arrive while we are sleeping waiting
   1864 	 * for old data structures to be purged or for the contents of the
   1865 	 * disk portion of this inode to be read.
   1866 	 */
   1867 
   1868 	ufs_ihashins(ip);
   1869 	mutex_exit(&ufs_hashlock);
   1870 
   1871 	/* Read in the disk contents for the inode, copy into the inode. */
   1872 	error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
   1873 		      (int)fs->fs_bsize, NOCRED, 0, &bp);
   1874 	if (error) {
   1875 
   1876 		/*
   1877 		 * The inode does not contain anything useful, so it would
   1878 		 * be misleading to leave it on its hash chain. With mode
   1879 		 * still zero, it will be unlinked and returned to the free
   1880 		 * list by vput().
   1881 		 */
   1882 
   1883 		vput(vp);
   1884 		*vpp = NULL;
   1885 		return (error);
   1886 	}
   1887 	if (ip->i_ump->um_fstype == UFS1)
   1888 		ip->i_din.ffs1_din = pool_cache_get(ffs_dinode1_cache,
   1889 		    PR_WAITOK);
   1890 	else
   1891 		ip->i_din.ffs2_din = pool_cache_get(ffs_dinode2_cache,
   1892 		    PR_WAITOK);
   1893 	ffs_load_inode(bp, ip, fs, ino);
   1894 	brelse(bp, 0);
   1895 
   1896 	/*
   1897 	 * Initialize the vnode from the inode, check for aliases.
   1898 	 * Note that the underlying vnode may have changed.
   1899 	 */
   1900 
   1901 	ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
   1902 
   1903 	/*
   1904 	 * Finish inode initialization now that aliasing has been resolved.
   1905 	 */
   1906 
   1907 	ip->i_devvp = ump->um_devvp;
   1908 	vref(ip->i_devvp);
   1909 
   1910 	/*
   1911 	 * Ensure that uid and gid are correct. This is a temporary
   1912 	 * fix until fsck has been changed to do the update.
   1913 	 */
   1914 
   1915 	if (fs->fs_old_inodefmt < FS_44INODEFMT) {		/* XXX */
   1916 		ip->i_uid = ip->i_ffs1_ouid;			/* XXX */
   1917 		ip->i_gid = ip->i_ffs1_ogid;			/* XXX */
   1918 	}							/* XXX */
   1919 	uvm_vnp_setsize(vp, ip->i_size);
   1920 	*vpp = vp;
   1921 	return (0);
   1922 }
   1923 
   1924 /*
   1925  * File handle to vnode
   1926  *
   1927  * Have to be really careful about stale file handles:
   1928  * - check that the inode number is valid
   1929  * - call ffs_vget() to get the locked inode
   1930  * - check for an unallocated inode (i_mode == 0)
   1931  * - check that the given client host has export rights and return
   1932  *   those rights via. exflagsp and credanonp
   1933  */
   1934 int
   1935 ffs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
   1936 {
   1937 	struct ufid ufh;
   1938 	struct fs *fs;
   1939 
   1940 	if (fhp->fid_len != sizeof(struct ufid))
   1941 		return EINVAL;
   1942 
   1943 	memcpy(&ufh, fhp, sizeof(ufh));
   1944 	fs = VFSTOUFS(mp)->um_fs;
   1945 	if (ufh.ufid_ino < UFS_ROOTINO ||
   1946 	    ufh.ufid_ino >= fs->fs_ncg * fs->fs_ipg)
   1947 		return (ESTALE);
   1948 	return (ufs_fhtovp(mp, &ufh, vpp));
   1949 }
   1950 
   1951 /*
   1952  * Vnode pointer to File handle
   1953  */
   1954 /* ARGSUSED */
   1955 int
   1956 ffs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
   1957 {
   1958 	struct inode *ip;
   1959 	struct ufid ufh;
   1960 
   1961 	if (*fh_size < sizeof(struct ufid)) {
   1962 		*fh_size = sizeof(struct ufid);
   1963 		return E2BIG;
   1964 	}
   1965 	ip = VTOI(vp);
   1966 	*fh_size = sizeof(struct ufid);
   1967 	memset(&ufh, 0, sizeof(ufh));
   1968 	ufh.ufid_len = sizeof(struct ufid);
   1969 	ufh.ufid_ino = ip->i_number;
   1970 	ufh.ufid_gen = ip->i_gen;
   1971 	memcpy(fhp, &ufh, sizeof(ufh));
   1972 	return (0);
   1973 }
   1974 
   1975 void
   1976 ffs_init(void)
   1977 {
   1978 	if (ffs_initcount++ > 0)
   1979 		return;
   1980 
   1981 	ffs_inode_cache = pool_cache_init(sizeof(struct inode), 0, 0, 0,
   1982 	    "ffsino", NULL, IPL_NONE, NULL, NULL, NULL);
   1983 	ffs_dinode1_cache = pool_cache_init(sizeof(struct ufs1_dinode), 0, 0, 0,
   1984 	    "ffsdino1", NULL, IPL_NONE, NULL, NULL, NULL);
   1985 	ffs_dinode2_cache = pool_cache_init(sizeof(struct ufs2_dinode), 0, 0, 0,
   1986 	    "ffsdino2", NULL, IPL_NONE, NULL, NULL, NULL);
   1987 	ufs_init();
   1988 }
   1989 
   1990 void
   1991 ffs_reinit(void)
   1992 {
   1993 
   1994 	ufs_reinit();
   1995 }
   1996 
   1997 void
   1998 ffs_done(void)
   1999 {
   2000 	if (--ffs_initcount > 0)
   2001 		return;
   2002 
   2003 	ufs_done();
   2004 	pool_cache_destroy(ffs_dinode2_cache);
   2005 	pool_cache_destroy(ffs_dinode1_cache);
   2006 	pool_cache_destroy(ffs_inode_cache);
   2007 }
   2008 
   2009 /*
   2010  * Write a superblock and associated information back to disk.
   2011  */
   2012 int
   2013 ffs_sbupdate(struct ufsmount *mp, int waitfor)
   2014 {
   2015 	struct fs *fs = mp->um_fs;
   2016 	struct buf *bp;
   2017 	int error = 0;
   2018 	u_int32_t saveflag;
   2019 
   2020 	error = ffs_getblk(mp->um_devvp,
   2021 	    fs->fs_sblockloc / DEV_BSIZE, FFS_NOBLK,
   2022 	    fs->fs_sbsize, false, &bp);
   2023 	if (error)
   2024 		return error;
   2025 	saveflag = fs->fs_flags & FS_INTERNAL;
   2026 	fs->fs_flags &= ~FS_INTERNAL;
   2027 
   2028 	memcpy(bp->b_data, fs, fs->fs_sbsize);
   2029 
   2030 	ffs_oldfscompat_write((struct fs *)bp->b_data, mp);
   2031 #ifdef FFS_EI
   2032 	if (mp->um_flags & UFS_NEEDSWAP)
   2033 		ffs_sb_swap((struct fs *)bp->b_data, (struct fs *)bp->b_data);
   2034 #endif
   2035 	fs->fs_flags |= saveflag;
   2036 
   2037 	if (waitfor == MNT_WAIT)
   2038 		error = bwrite(bp);
   2039 	else
   2040 		bawrite(bp);
   2041 	return (error);
   2042 }
   2043 
   2044 int
   2045 ffs_cgupdate(struct ufsmount *mp, int waitfor)
   2046 {
   2047 	struct fs *fs = mp->um_fs;
   2048 	struct buf *bp;
   2049 	int blks;
   2050 	void *space;
   2051 	int i, size, error = 0, allerror = 0;
   2052 
   2053 	allerror = ffs_sbupdate(mp, waitfor);
   2054 	blks = howmany(fs->fs_cssize, fs->fs_fsize);
   2055 	space = fs->fs_csp;
   2056 	for (i = 0; i < blks; i += fs->fs_frag) {
   2057 		size = fs->fs_bsize;
   2058 		if (i + fs->fs_frag > blks)
   2059 			size = (blks - i) * fs->fs_fsize;
   2060 		error = ffs_getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i),
   2061 		    FFS_NOBLK, size, false, &bp);
   2062 		if (error)
   2063 			break;
   2064 #ifdef FFS_EI
   2065 		if (mp->um_flags & UFS_NEEDSWAP)
   2066 			ffs_csum_swap((struct csum*)space,
   2067 			    (struct csum*)bp->b_data, size);
   2068 		else
   2069 #endif
   2070 			memcpy(bp->b_data, space, (u_int)size);
   2071 		space = (char *)space + size;
   2072 		if (waitfor == MNT_WAIT)
   2073 			error = bwrite(bp);
   2074 		else
   2075 			bawrite(bp);
   2076 	}
   2077 	if (!allerror && error)
   2078 		allerror = error;
   2079 	return (allerror);
   2080 }
   2081 
   2082 int
   2083 ffs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
   2084     int attrnamespace, const char *attrname)
   2085 {
   2086 #ifdef UFS_EXTATTR
   2087 	/*
   2088 	 * File-backed extended attributes are only supported on UFS1.
   2089 	 * UFS2 has native extended attributes.
   2090 	 */
   2091 	if (VFSTOUFS(mp)->um_fstype == UFS1)
   2092 		return (ufs_extattrctl(mp, cmd, vp, attrnamespace, attrname));
   2093 #endif
   2094 	return (vfs_stdextattrctl(mp, cmd, vp, attrnamespace, attrname));
   2095 }
   2096 
   2097 int
   2098 ffs_suspendctl(struct mount *mp, int cmd)
   2099 {
   2100 	int error;
   2101 	struct lwp *l = curlwp;
   2102 
   2103 	switch (cmd) {
   2104 	case SUSPEND_SUSPEND:
   2105 		if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0)
   2106 			return error;
   2107 		error = ffs_sync(mp, MNT_WAIT, l->l_proc->p_cred);
   2108 		if (error == 0)
   2109 			error = fstrans_setstate(mp, FSTRANS_SUSPENDED);
   2110 #ifdef WAPBL
   2111 		if (error == 0 && mp->mnt_wapbl)
   2112 			error = wapbl_flush(mp->mnt_wapbl, 1);
   2113 #endif
   2114 		if (error != 0) {
   2115 			(void) fstrans_setstate(mp, FSTRANS_NORMAL);
   2116 			return error;
   2117 		}
   2118 		return 0;
   2119 
   2120 	case SUSPEND_RESUME:
   2121 		return fstrans_setstate(mp, FSTRANS_NORMAL);
   2122 
   2123 	default:
   2124 		return EINVAL;
   2125 	}
   2126 }
   2127 
   2128 /*
   2129  * Synch vnode for a mounted file system.
   2130  */
   2131 static int
   2132 ffs_vfs_fsync(vnode_t *vp, int flags)
   2133 {
   2134 	int error, i, pflags;
   2135 #ifdef WAPBL
   2136 	struct mount *mp;
   2137 #endif
   2138 
   2139 	KASSERT(vp->v_type == VBLK);
   2140 	KASSERT(vp->v_specmountpoint != NULL);
   2141 
   2142 	/*
   2143 	 * Flush all dirty data associated with the vnode.
   2144 	 */
   2145 	pflags = PGO_ALLPAGES | PGO_CLEANIT;
   2146 	if ((flags & FSYNC_WAIT) != 0)
   2147 		pflags |= PGO_SYNCIO;
   2148 	mutex_enter(vp->v_interlock);
   2149 	error = VOP_PUTPAGES(vp, 0, 0, pflags);
   2150 	if (error)
   2151 		return error;
   2152 
   2153 #ifdef WAPBL
   2154 	mp = vp->v_specmountpoint;
   2155 	if (mp && mp->mnt_wapbl) {
   2156 		/*
   2157 		 * Don't bother writing out metadata if the syncer is
   2158 		 * making the request.  We will let the sync vnode
   2159 		 * write it out in a single burst through a call to
   2160 		 * VFS_SYNC().
   2161 		 */
   2162 		if ((flags & (FSYNC_DATAONLY | FSYNC_LAZY | FSYNC_NOLOG)) != 0)
   2163 			return 0;
   2164 
   2165 		/*
   2166 		 * Don't flush the log if the vnode being flushed
   2167 		 * contains no dirty buffers that could be in the log.
   2168 		 */
   2169 		if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
   2170 			error = wapbl_flush(mp->mnt_wapbl, 0);
   2171 			if (error)
   2172 				return error;
   2173 		}
   2174 
   2175 		if ((flags & FSYNC_WAIT) != 0) {
   2176 			mutex_enter(vp->v_interlock);
   2177 			while (vp->v_numoutput)
   2178 				cv_wait(&vp->v_cv, vp->v_interlock);
   2179 			mutex_exit(vp->v_interlock);
   2180 		}
   2181 
   2182 		return 0;
   2183 	}
   2184 #endif /* WAPBL */
   2185 
   2186 	error = vflushbuf(vp, flags);
   2187 	if (error == 0 && (flags & FSYNC_CACHE) != 0) {
   2188 		i = 1;
   2189 		(void)VOP_IOCTL(vp, DIOCCACHESYNC, &i, FWRITE,
   2190 		    kauth_cred_get());
   2191 	}
   2192 
   2193 	return error;
   2194 }
   2195