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ffs_vfsops.c revision 1.339.2.1
      1 /*	$NetBSD: ffs_vfsops.c,v 1.339.2.1 2016/07/20 23:47:57 pgoyette 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 1.339.2.1 2016/07/20 23:47:57 pgoyette 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 #ifdef WAPBL
    113 MODULE(MODULE_CLASS_VFS, ffs, "wapbl");
    114 #else
    115 MODULE(MODULE_CLASS_VFS, ffs, NULL);
    116 #endif
    117 
    118 static int ffs_vfs_fsync(vnode_t *, int);
    119 static int ffs_superblock_validate(struct fs *);
    120 static int ffs_is_appleufs(struct vnode *, struct fs *);
    121 
    122 static int ffs_init_vnode(struct ufsmount *, struct vnode *, ino_t);
    123 static void ffs_deinit_vnode(struct ufsmount *, struct vnode *);
    124 
    125 static struct sysctllog *ffs_sysctl_log;
    126 
    127 static kauth_listener_t ffs_snapshot_listener;
    128 
    129 /* how many times ffs_init() was called */
    130 int ffs_initcount = 0;
    131 
    132 #ifdef DEBUG_FFS_MOUNT
    133 #define DPRINTF(_fmt, args...)	printf("%s: " _fmt "\n", __func__, ##args)
    134 #else
    135 #define DPRINTF(_fmt, args...)	do {} while (/*CONSTCOND*/0)
    136 #endif
    137 
    138 extern const struct vnodeopv_desc ffs_vnodeop_opv_desc;
    139 extern const struct vnodeopv_desc ffs_specop_opv_desc;
    140 extern const struct vnodeopv_desc ffs_fifoop_opv_desc;
    141 
    142 const struct vnodeopv_desc * const ffs_vnodeopv_descs[] = {
    143 	&ffs_vnodeop_opv_desc,
    144 	&ffs_specop_opv_desc,
    145 	&ffs_fifoop_opv_desc,
    146 	NULL,
    147 };
    148 
    149 struct vfsops ffs_vfsops = {
    150 	.vfs_name = MOUNT_FFS,
    151 	.vfs_min_mount_data = sizeof (struct ufs_args),
    152 	.vfs_mount = ffs_mount,
    153 	.vfs_start = ufs_start,
    154 	.vfs_unmount = ffs_unmount,
    155 	.vfs_root = ufs_root,
    156 	.vfs_quotactl = ufs_quotactl,
    157 	.vfs_statvfs = ffs_statvfs,
    158 	.vfs_sync = ffs_sync,
    159 	.vfs_vget = ufs_vget,
    160 	.vfs_loadvnode = ffs_loadvnode,
    161 	.vfs_newvnode = ffs_newvnode,
    162 	.vfs_fhtovp = ffs_fhtovp,
    163 	.vfs_vptofh = ffs_vptofh,
    164 	.vfs_init = ffs_init,
    165 	.vfs_reinit = ffs_reinit,
    166 	.vfs_done = ffs_done,
    167 	.vfs_mountroot = ffs_mountroot,
    168 	.vfs_snapshot = ffs_snapshot,
    169 	.vfs_extattrctl = ffs_extattrctl,
    170 	.vfs_suspendctl = ffs_suspendctl,
    171 	.vfs_renamelock_enter = genfs_renamelock_enter,
    172 	.vfs_renamelock_exit = genfs_renamelock_exit,
    173 	.vfs_fsync = ffs_vfs_fsync,
    174 	.vfs_opv_descs = ffs_vnodeopv_descs
    175 };
    176 
    177 static const struct genfs_ops ffs_genfsops = {
    178 	.gop_size = ffs_gop_size,
    179 	.gop_alloc = ufs_gop_alloc,
    180 	.gop_write = genfs_gop_write,
    181 	.gop_markupdate = ufs_gop_markupdate,
    182 };
    183 
    184 static const struct ufs_ops ffs_ufsops = {
    185 	.uo_itimes = ffs_itimes,
    186 	.uo_update = ffs_update,
    187 	.uo_truncate = ffs_truncate,
    188 	.uo_balloc = ffs_balloc,
    189 	.uo_snapgone = ffs_snapgone,
    190 	.uo_bufrd = ffs_bufrd,
    191 	.uo_bufwr = ffs_bufwr,
    192 };
    193 
    194 static int
    195 ffs_checkrange(struct mount *mp, uint32_t ino)
    196 {
    197 	struct fs *fs = VFSTOUFS(mp)->um_fs;
    198 
    199 	if (ino < UFS_ROOTINO || ino >= fs->fs_ncg * fs->fs_ipg) {
    200 		DPRINTF("out of range %u\n", ino);
    201 		return ESTALE;
    202 	}
    203 
    204 	/*
    205 	 * Need to check if inode is initialized because ffsv2 does
    206 	 * lazy initialization and we can get here from nfs_fhtovp
    207 	 */
    208 	if (fs->fs_magic != FS_UFS2_MAGIC)
    209 		return 0;
    210 
    211 	struct buf *bp;
    212 	int cg = ino_to_cg(fs, ino);
    213 	struct ufsmount *ump = VFSTOUFS(mp);
    214 
    215 	int error = bread(ump->um_devvp, FFS_FSBTODB(fs, cgtod(fs, cg)),
    216 	    (int)fs->fs_cgsize, B_MODIFY, &bp);
    217 	if (error) {
    218 		DPRINTF("error %d reading cg %d ino %u\n", error, cg, ino);
    219 		return error;
    220 	}
    221 
    222 	const int needswap = UFS_FSNEEDSWAP(fs);
    223 
    224 	struct cg *cgp = (struct cg *)bp->b_data;
    225 	if (!cg_chkmagic(cgp, needswap)) {
    226 		brelse(bp, 0);
    227 		DPRINTF("bad cylinder group magic cg %d ino %u\n", cg, ino);
    228 		return ESTALE;
    229 	}
    230 
    231 	int32_t initediblk = ufs_rw32(cgp->cg_initediblk, needswap);
    232 	brelse(bp, 0);
    233 
    234 	if (cg * fs->fs_ipg + initediblk < ino) {
    235 		DPRINTF("cg=%d fs->fs_ipg=%d initediblk=%d ino=%u\n",
    236 		    cg, fs->fs_ipg, initediblk, ino);
    237 		return ESTALE;
    238 	}
    239 	return 0;
    240 }
    241 
    242 static int
    243 ffs_snapshot_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
    244     void *arg0, void *arg1, void *arg2, void *arg3)
    245 {
    246 	vnode_t *vp = arg2;
    247 	int result = KAUTH_RESULT_DEFER;
    248 
    249 	if (action != KAUTH_SYSTEM_FS_SNAPSHOT)
    250 		return result;
    251 
    252 	if (VTOI(vp)->i_uid == kauth_cred_geteuid(cred))
    253 		result = KAUTH_RESULT_ALLOW;
    254 
    255 	return result;
    256 }
    257 
    258 static int
    259 ffs_modcmd(modcmd_t cmd, void *arg)
    260 {
    261 	int error;
    262 
    263 #if 0
    264 	extern int doasyncfree;
    265 #endif
    266 #ifdef UFS_EXTATTR
    267 	extern int ufs_extattr_autocreate;
    268 #endif
    269 	extern int ffs_log_changeopt;
    270 
    271 	switch (cmd) {
    272 	case MODULE_CMD_INIT:
    273 		error = vfs_attach(&ffs_vfsops);
    274 		if (error != 0)
    275 			break;
    276 
    277 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    278 			       CTLFLAG_PERMANENT,
    279 			       CTLTYPE_NODE, "ffs",
    280 			       SYSCTL_DESCR("Berkeley Fast File System"),
    281 			       NULL, 0, NULL, 0,
    282 			       CTL_VFS, 1, CTL_EOL);
    283 		/*
    284 		 * @@@ should we even bother with these first three?
    285 		 */
    286 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    287 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    288 			       CTLTYPE_INT, "doclusterread", NULL,
    289 			       sysctl_notavail, 0, NULL, 0,
    290 			       CTL_VFS, 1, FFS_CLUSTERREAD, CTL_EOL);
    291 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    292 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    293 			       CTLTYPE_INT, "doclusterwrite", NULL,
    294 			       sysctl_notavail, 0, NULL, 0,
    295 			       CTL_VFS, 1, FFS_CLUSTERWRITE, CTL_EOL);
    296 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    297 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    298 			       CTLTYPE_INT, "doreallocblks", NULL,
    299 			       sysctl_notavail, 0, NULL, 0,
    300 			       CTL_VFS, 1, FFS_REALLOCBLKS, CTL_EOL);
    301 #if 0
    302 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    303 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    304 			       CTLTYPE_INT, "doasyncfree",
    305 			       SYSCTL_DESCR("Release dirty blocks asynchronously"),
    306 			       NULL, 0, &doasyncfree, 0,
    307 			       CTL_VFS, 1, FFS_ASYNCFREE, CTL_EOL);
    308 #endif
    309 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    310 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    311 			       CTLTYPE_INT, "log_changeopt",
    312 			       SYSCTL_DESCR("Log changes in optimization strategy"),
    313 			       NULL, 0, &ffs_log_changeopt, 0,
    314 			       CTL_VFS, 1, FFS_LOG_CHANGEOPT, CTL_EOL);
    315 #ifdef UFS_EXTATTR
    316 		sysctl_createv(&ffs_sysctl_log, 0, NULL, NULL,
    317 			       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
    318 			       CTLTYPE_INT, "extattr_autocreate",
    319 			       SYSCTL_DESCR("Size of attribute for "
    320 					    "backing file autocreation"),
    321 			       NULL, 0, &ufs_extattr_autocreate, 0,
    322 			       CTL_VFS, 1, FFS_EXTATTR_AUTOCREATE, CTL_EOL);
    323 
    324 #endif /* UFS_EXTATTR */
    325 
    326 		ffs_snapshot_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
    327 		    ffs_snapshot_cb, NULL);
    328 		if (ffs_snapshot_listener == NULL)
    329 			printf("ffs_modcmd: can't listen on system scope.\n");
    330 
    331 		break;
    332 	case MODULE_CMD_FINI:
    333 		error = vfs_detach(&ffs_vfsops);
    334 		if (error != 0)
    335 			break;
    336 		sysctl_teardown(&ffs_sysctl_log);
    337 		if (ffs_snapshot_listener != NULL)
    338 			kauth_unlisten_scope(ffs_snapshot_listener);
    339 		break;
    340 	default:
    341 		error = ENOTTY;
    342 		break;
    343 	}
    344 
    345 	return (error);
    346 }
    347 
    348 pool_cache_t ffs_inode_cache;
    349 pool_cache_t ffs_dinode1_cache;
    350 pool_cache_t ffs_dinode2_cache;
    351 
    352 static void ffs_oldfscompat_read(struct fs *, struct ufsmount *, daddr_t);
    353 static void ffs_oldfscompat_write(struct fs *, struct ufsmount *);
    354 
    355 /*
    356  * Called by main() when ffs is going to be mounted as root.
    357  */
    358 
    359 int
    360 ffs_mountroot(void)
    361 {
    362 	struct fs *fs;
    363 	struct mount *mp;
    364 	struct lwp *l = curlwp;			/* XXX */
    365 	struct ufsmount *ump;
    366 	int error;
    367 
    368 	if (device_class(root_device) != DV_DISK)
    369 		return (ENODEV);
    370 
    371 	if ((error = vfs_rootmountalloc(MOUNT_FFS, "root_device", &mp))) {
    372 		vrele(rootvp);
    373 		return (error);
    374 	}
    375 
    376 	/*
    377 	 * We always need to be able to mount the root file system.
    378 	 */
    379 	mp->mnt_flag |= MNT_FORCE;
    380 	if ((error = ffs_mountfs(rootvp, mp, l)) != 0) {
    381 		vfs_unbusy(mp, false, NULL);
    382 		vfs_destroy(mp);
    383 		return (error);
    384 	}
    385 	mp->mnt_flag &= ~MNT_FORCE;
    386 	mountlist_append(mp);
    387 	ump = VFSTOUFS(mp);
    388 	fs = ump->um_fs;
    389 	memset(fs->fs_fsmnt, 0, sizeof(fs->fs_fsmnt));
    390 	(void)copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0);
    391 	(void)ffs_statvfs(mp, &mp->mnt_stat);
    392 	vfs_unbusy(mp, false, NULL);
    393 	setrootfstime((time_t)fs->fs_time);
    394 	return (0);
    395 }
    396 
    397 /*
    398  * VFS Operations.
    399  *
    400  * mount system call
    401  */
    402 int
    403 ffs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
    404 {
    405 	struct lwp *l = curlwp;
    406 	struct vnode *devvp = NULL;
    407 	struct ufs_args *args = data;
    408 	struct ufsmount *ump = NULL;
    409 	struct fs *fs;
    410 	int error = 0, flags, update;
    411 	mode_t accessmode;
    412 	const struct bdevsw *bdev = NULL;
    413 
    414 	if (args == NULL) {
    415 		DPRINTF("NULL args");
    416 		return EINVAL;
    417 	}
    418 	if (*data_len < sizeof(*args)) {
    419 		DPRINTF("bad size args %zu != %zu", *data_len, sizeof(*args));
    420 		return EINVAL;
    421 	}
    422 
    423 	if (mp->mnt_flag & MNT_GETARGS) {
    424 		ump = VFSTOUFS(mp);
    425 		if (ump == NULL) {
    426 			DPRINTF("no ump");
    427 			return EIO;
    428 		}
    429 		args->fspec = NULL;
    430 		*data_len = sizeof *args;
    431 		return 0;
    432 	}
    433 
    434 	update = mp->mnt_flag & MNT_UPDATE;
    435 
    436 	/* Check arguments */
    437 	if (args->fspec != NULL) {
    438 		/*
    439 		 * Look up the name and verify that it's sane.
    440 		 */
    441 		error = namei_simple_user(args->fspec,
    442 		    NSM_FOLLOW_NOEMULROOT, &devvp);
    443 		if (error != 0) {
    444 			DPRINTF("namei_simple_user returned %d", error);
    445 			return error;
    446 		}
    447 
    448 		if (!update) {
    449 			/*
    450 			 * Be sure this is a valid block device
    451 			 */
    452 			if (devvp->v_type != VBLK) {
    453 				DPRINTF("non block device %d", devvp->v_type);
    454 				error = ENOTBLK;
    455 			} else if (bdevsw_lookup_acquire(devvp->v_rdev) == NULL) {
    456 				DPRINTF("can't find block device 0x%jx",
    457 				    devvp->v_rdev);
    458 				error = ENXIO;
    459 			}
    460 		} else {
    461 			/*
    462 			 * Be sure we're still naming the same device
    463 			 * used for our initial mount
    464 			 */
    465 			ump = VFSTOUFS(mp);
    466 			if (devvp != ump->um_devvp) {
    467 				if (devvp->v_rdev != ump->um_devvp->v_rdev) {
    468 					DPRINTF("wrong device 0x%jx != 0x%jx",
    469 					    (uintmax_t)devvp->v_rdev,
    470 					    (uintmax_t)ump->um_devvp->v_rdev);
    471 					error = EINVAL;
    472 				} else {
    473 					vrele(devvp);
    474 					devvp = ump->um_devvp;
    475 					vref(devvp);
    476 				}
    477 			}
    478 		}
    479 	} else {
    480 		if (!update) {
    481 			/* New mounts must have a filename for the device */
    482 			DPRINTF("no filename for mount");
    483 			return EINVAL;
    484 		} else {
    485 			/* Use the extant mount */
    486 			ump = VFSTOUFS(mp);
    487 			devvp = ump->um_devvp;
    488 			vref(devvp);
    489 		}
    490 	}
    491 
    492 	/*
    493 	 * If mount by non-root, then verify that user has necessary
    494 	 * permissions on the device.
    495 	 *
    496 	 * Permission to update a mount is checked higher, so here we presume
    497 	 * updating the mount is okay (for example, as far as securelevel goes)
    498 	 * which leaves us with the normal check.
    499 	 */
    500 	if (error == 0) {
    501 		accessmode = VREAD;
    502 		if (update ?
    503 		    (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
    504 		    (mp->mnt_flag & MNT_RDONLY) == 0)
    505 			accessmode |= VWRITE;
    506 		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    507 		error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
    508 		    KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
    509 		    KAUTH_ARG(accessmode));
    510 		if (error) {
    511 			DPRINTF("kauth returned %d", error);
    512 		}
    513 		VOP_UNLOCK(devvp);
    514 	}
    515 
    516 	if (error)
    517 		goto fail;
    518 
    519 #ifdef WAPBL
    520 	/* WAPBL can only be enabled on a r/w mount. */
    521 	if ((mp->mnt_flag & MNT_RDONLY) && !(mp->mnt_iflag & IMNT_WANTRDWR)) {
    522 		mp->mnt_flag &= ~MNT_LOG;
    523 	}
    524 #else /* !WAPBL */
    525 	mp->mnt_flag &= ~MNT_LOG;
    526 #endif /* !WAPBL */
    527 
    528 	if (!update) {
    529 		int xflags;
    530 
    531 		if (mp->mnt_flag & MNT_RDONLY)
    532 			xflags = FREAD;
    533 		else
    534 			xflags = FREAD | FWRITE;
    535 		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    536 		error = VOP_OPEN(devvp, xflags, FSCRED);
    537 		VOP_UNLOCK(devvp);
    538 		if (error) {
    539 			DPRINTF("VOP_OPEN returned %d", error);
    540 			goto fail;
    541 		}
    542 		error = ffs_mountfs(devvp, mp, l);
    543 		if (error) {
    544 			DPRINTF("ffs_mountfs returned %d", error);
    545 			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    546 			(void)VOP_CLOSE(devvp, xflags, NOCRED);
    547 			VOP_UNLOCK(devvp);
    548 			goto fail;
    549 		}
    550 
    551 		ump = VFSTOUFS(mp);
    552 		fs = ump->um_fs;
    553 	} else {
    554 		/*
    555 		 * Update the mount.
    556 		 */
    557 
    558 		/*
    559 		 * The initial mount got a reference on this
    560 		 * device, so drop the one obtained via
    561 		 * namei(), above.
    562 		 */
    563 		vrele(devvp);
    564 
    565 		ump = VFSTOUFS(mp);
    566 		fs = ump->um_fs;
    567 		if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
    568 			/*
    569 			 * Changing from r/w to r/o
    570 			 */
    571 			flags = WRITECLOSE;
    572 			if (mp->mnt_flag & MNT_FORCE)
    573 				flags |= FORCECLOSE;
    574 			error = ffs_flushfiles(mp, flags, l);
    575 			if (error == 0)
    576 				error = UFS_WAPBL_BEGIN(mp);
    577 			if (error == 0 &&
    578 			    ffs_cgupdate(ump, MNT_WAIT) == 0 &&
    579 			    fs->fs_clean & FS_WASCLEAN) {
    580 				if (mp->mnt_flag & MNT_SOFTDEP)
    581 					fs->fs_flags &= ~FS_DOSOFTDEP;
    582 				fs->fs_clean = FS_ISCLEAN;
    583 				(void) ffs_sbupdate(ump, MNT_WAIT);
    584 			}
    585 			if (error) {
    586 				DPRINTF("wapbl %d", error);
    587 				return error;
    588 			}
    589 			UFS_WAPBL_END(mp);
    590 		}
    591 
    592 #ifdef WAPBL
    593 		if ((mp->mnt_flag & MNT_LOG) == 0) {
    594 			error = ffs_wapbl_stop(mp, mp->mnt_flag & MNT_FORCE);
    595 			if (error) {
    596 				DPRINTF("ffs_wapbl_stop returned %d", error);
    597 				return error;
    598 			}
    599 		}
    600 #endif /* WAPBL */
    601 
    602 		if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
    603 			/*
    604 			 * Finish change from r/w to r/o
    605 			 */
    606 			fs->fs_ronly = 1;
    607 			fs->fs_fmod = 0;
    608 		}
    609 
    610 		if (mp->mnt_flag & MNT_RELOAD) {
    611 			error = ffs_reload(mp, l->l_cred, l);
    612 			if (error) {
    613 				DPRINTF("ffs_reload returned %d", error);
    614 				return error;
    615 			}
    616 		}
    617 
    618 		if (fs->fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) {
    619 			/*
    620 			 * Changing from read-only to read/write
    621 			 */
    622 #ifndef QUOTA2
    623 			if (fs->fs_flags & FS_DOQUOTA2) {
    624 				ump->um_flags |= UFS_QUOTA2;
    625 				uprintf("%s: options QUOTA2 not enabled%s\n",
    626 				    mp->mnt_stat.f_mntonname,
    627 				    (mp->mnt_flag & MNT_FORCE) ? "" :
    628 				    ", not mounting");
    629 				DPRINTF("ffs_quota2 %d", EINVAL);
    630 				return EINVAL;
    631 			}
    632 #endif
    633 			fs->fs_ronly = 0;
    634 			fs->fs_clean <<= 1;
    635 			fs->fs_fmod = 1;
    636 #ifdef WAPBL
    637 			if (fs->fs_flags & FS_DOWAPBL) {
    638 				const char *nm = mp->mnt_stat.f_mntonname;
    639 				if (!mp->mnt_wapbl_replay) {
    640 					printf("%s: log corrupted;"
    641 					    " replay cancelled\n", nm);
    642 					return EFTYPE;
    643 				}
    644 				printf("%s: replaying log to disk\n", nm);
    645 				error = wapbl_replay_write(mp->mnt_wapbl_replay,
    646 				    devvp);
    647 				if (error) {
    648 					DPRINTF("%s: wapbl_replay_write %d",
    649 					    nm, error);
    650 					return error;
    651 				}
    652 				wapbl_replay_stop(mp->mnt_wapbl_replay);
    653 				fs->fs_clean = FS_WASCLEAN;
    654 			}
    655 #endif /* WAPBL */
    656 			if (fs->fs_snapinum[0] != 0)
    657 				ffs_snapshot_mount(mp);
    658 		}
    659 
    660 #ifdef WAPBL
    661 		error = ffs_wapbl_start(mp);
    662 		if (error) {
    663 			DPRINTF("ffs_wapbl_start returned %d", error);
    664 			return error;
    665 		}
    666 #endif /* WAPBL */
    667 
    668 #ifdef QUOTA2
    669 		if (!fs->fs_ronly) {
    670 			error = ffs_quota2_mount(mp);
    671 			if (error) {
    672 				DPRINTF("ffs_quota2_mount returned %d", error);
    673 				return error;
    674 			}
    675 		}
    676 #endif
    677 
    678 		if ((mp->mnt_flag & MNT_DISCARD) && !(ump->um_discarddata))
    679 			ump->um_discarddata = ffs_discard_init(devvp, fs);
    680 
    681 		if (args->fspec == NULL)
    682 			return 0;
    683 	}
    684 
    685 	error = set_statvfs_info(path, UIO_USERSPACE, args->fspec,
    686 	    UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
    687 	if (error == 0)
    688 		(void)strncpy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname,
    689 		    sizeof(fs->fs_fsmnt));
    690 	else {
    691 	    DPRINTF("set_statvfs_info returned %d", error);
    692 	}
    693 	fs->fs_flags &= ~FS_DOSOFTDEP;
    694 	if (fs->fs_fmod != 0) {	/* XXX */
    695 		int err;
    696 
    697 		fs->fs_fmod = 0;
    698 		if (fs->fs_clean & FS_WASCLEAN)
    699 			fs->fs_time = time_second;
    700 		else {
    701 			printf("%s: file system not clean (fs_clean=%#x); "
    702 			    "please fsck(8)\n", mp->mnt_stat.f_mntfromname,
    703 			    fs->fs_clean);
    704 			printf("%s: lost blocks %" PRId64 " files %d\n",
    705 			    mp->mnt_stat.f_mntfromname, fs->fs_pendingblocks,
    706 			    fs->fs_pendinginodes);
    707 		}
    708 		err = UFS_WAPBL_BEGIN(mp);
    709 		if (err == 0) {
    710 			(void) ffs_cgupdate(ump, MNT_WAIT);
    711 			UFS_WAPBL_END(mp);
    712 		}
    713 	}
    714 	if ((mp->mnt_flag & MNT_SOFTDEP) != 0) {
    715 		printf("%s: `-o softdep' is no longer supported, "
    716 		    "consider `-o log'\n", mp->mnt_stat.f_mntfromname);
    717 		mp->mnt_flag &= ~MNT_SOFTDEP;
    718 	}
    719 
    720 	if (bdev != NULL)
    721 		bdevsw_release(bdev);
    722 	return (error);
    723 
    724 fail:
    725 	if (bdev != NULL)
    726 		bdevsw_release(bdev);
    727 	vrele(devvp);
    728 	return (error);
    729 }
    730 
    731 /*
    732  * Reload all incore data for a filesystem (used after running fsck on
    733  * the root filesystem and finding things to fix). The filesystem must
    734  * be mounted read-only.
    735  *
    736  * Things to do to update the mount:
    737  *	1) invalidate all cached meta-data.
    738  *	2) re-read superblock from disk.
    739  *	3) re-read summary information from disk.
    740  *	4) invalidate all inactive vnodes.
    741  *	5) invalidate all cached file data.
    742  *	6) re-read inode data for all active vnodes.
    743  */
    744 int
    745 ffs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l)
    746 {
    747 	struct vnode *vp, *devvp;
    748 	struct inode *ip;
    749 	void *space;
    750 	struct buf *bp;
    751 	struct fs *fs, *newfs;
    752 	int i, bsize, blks, error;
    753 	int32_t *lp, fs_sbsize;
    754 	struct ufsmount *ump;
    755 	daddr_t sblockloc;
    756 	struct vnode_iterator *marker;
    757 
    758 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
    759 		return (EINVAL);
    760 
    761 	ump = VFSTOUFS(mp);
    762 
    763 	/*
    764 	 * Step 1: invalidate all cached meta-data.
    765 	 */
    766 	devvp = ump->um_devvp;
    767 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    768 	error = vinvalbuf(devvp, 0, cred, l, 0, 0);
    769 	VOP_UNLOCK(devvp);
    770 	if (error)
    771 		panic("%s: dirty1", __func__);
    772 
    773 	/*
    774 	 * Step 2: re-read superblock from disk. XXX: We don't handle
    775 	 * possibility that superblock moved. Which implies that we don't
    776 	 * want its size to change either.
    777 	 */
    778 	fs = ump->um_fs;
    779 	fs_sbsize = fs->fs_sbsize;
    780 	error = bread(devvp, fs->fs_sblockloc / DEV_BSIZE, fs_sbsize,
    781 		      0, &bp);
    782 	if (error)
    783 		return (error);
    784 	newfs = kmem_alloc(fs_sbsize, KM_SLEEP);
    785 	memcpy(newfs, bp->b_data, fs_sbsize);
    786 
    787 #ifdef FFS_EI
    788 	if (ump->um_flags & UFS_NEEDSWAP) {
    789 		ffs_sb_swap((struct fs *)bp->b_data, newfs);
    790 		newfs->fs_flags |= FS_SWAPPED;
    791 	} else
    792 #endif
    793 		newfs->fs_flags &= ~FS_SWAPPED;
    794 
    795 	brelse(bp, 0);
    796 
    797 	if ((newfs->fs_magic != FS_UFS1_MAGIC) &&
    798 	    (newfs->fs_magic != FS_UFS2_MAGIC)) {
    799 		kmem_free(newfs, fs_sbsize);
    800 		return (EIO);		/* XXX needs translation */
    801 	}
    802 	if (!ffs_superblock_validate(newfs)) {
    803 		kmem_free(newfs, fs_sbsize);
    804 		return (EINVAL);
    805 	}
    806 
    807 	/*
    808 	 * The current implementation doesn't handle the possibility that
    809 	 * these values may have changed.
    810 	 */
    811 	if ((newfs->fs_sbsize != fs_sbsize) ||
    812 	    (newfs->fs_cssize != fs->fs_cssize) ||
    813 	    (newfs->fs_contigsumsize != fs->fs_contigsumsize) ||
    814 	    (newfs->fs_ncg != fs->fs_ncg)) {
    815 		kmem_free(newfs, fs_sbsize);
    816 		return (EINVAL);
    817 	}
    818 
    819 	/* Store off old fs_sblockloc for fs_oldfscompat_read. */
    820 	sblockloc = fs->fs_sblockloc;
    821 	/*
    822 	 * Copy pointer fields back into superblock before copying in	XXX
    823 	 * new superblock. These should really be in the ufsmount.	XXX
    824 	 * Note that important parameters (eg fs_ncg) are unchanged.
    825 	 */
    826 	newfs->fs_csp = fs->fs_csp;
    827 	newfs->fs_maxcluster = fs->fs_maxcluster;
    828 	newfs->fs_contigdirs = fs->fs_contigdirs;
    829 	newfs->fs_ronly = fs->fs_ronly;
    830 	newfs->fs_active = fs->fs_active;
    831 	memcpy(fs, newfs, (u_int)fs_sbsize);
    832 	kmem_free(newfs, fs_sbsize);
    833 
    834 	/*
    835 	 * Recheck for Apple UFS filesystem.
    836 	 */
    837 	ump->um_flags &= ~UFS_ISAPPLEUFS;
    838 	if (ffs_is_appleufs(devvp, fs)) {
    839 #ifdef APPLE_UFS
    840 		ump->um_flags |= UFS_ISAPPLEUFS;
    841 #else
    842 		DPRINTF("AppleUFS not supported");
    843 		return (EIO); /* XXX: really? */
    844 #endif
    845 	}
    846 
    847 	if (UFS_MPISAPPLEUFS(ump)) {
    848 		/* see comment about NeXT below */
    849 		ump->um_maxsymlinklen = APPLEUFS_MAXSYMLINKLEN;
    850 		ump->um_dirblksiz = APPLEUFS_DIRBLKSIZ;
    851 		mp->mnt_iflag |= IMNT_DTYPE;
    852 	} else {
    853 		ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
    854 		ump->um_dirblksiz = UFS_DIRBLKSIZ;
    855 		if (ump->um_maxsymlinklen > 0)
    856 			mp->mnt_iflag |= IMNT_DTYPE;
    857 		else
    858 			mp->mnt_iflag &= ~IMNT_DTYPE;
    859 	}
    860 	ffs_oldfscompat_read(fs, ump, sblockloc);
    861 
    862 	mutex_enter(&ump->um_lock);
    863 	ump->um_maxfilesize = fs->fs_maxfilesize;
    864 	if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
    865 		uprintf("%s: unknown ufs flags: 0x%08"PRIx32"%s\n",
    866 		    mp->mnt_stat.f_mntonname, fs->fs_flags,
    867 		    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
    868 		if ((mp->mnt_flag & MNT_FORCE) == 0) {
    869 			mutex_exit(&ump->um_lock);
    870 			return (EINVAL);
    871 		}
    872 	}
    873 	if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
    874 		fs->fs_pendingblocks = 0;
    875 		fs->fs_pendinginodes = 0;
    876 	}
    877 	mutex_exit(&ump->um_lock);
    878 
    879 	ffs_statvfs(mp, &mp->mnt_stat);
    880 	/*
    881 	 * Step 3: re-read summary information from disk.
    882 	 */
    883 	blks = howmany(fs->fs_cssize, fs->fs_fsize);
    884 	space = fs->fs_csp;
    885 	for (i = 0; i < blks; i += fs->fs_frag) {
    886 		bsize = fs->fs_bsize;
    887 		if (i + fs->fs_frag > blks)
    888 			bsize = (blks - i) * fs->fs_fsize;
    889 		error = bread(devvp, FFS_FSBTODB(fs, fs->fs_csaddr + i), bsize,
    890 			      0, &bp);
    891 		if (error) {
    892 			return (error);
    893 		}
    894 #ifdef FFS_EI
    895 		if (UFS_FSNEEDSWAP(fs))
    896 			ffs_csum_swap((struct csum *)bp->b_data,
    897 			    (struct csum *)space, bsize);
    898 		else
    899 #endif
    900 			memcpy(space, bp->b_data, (size_t)bsize);
    901 		space = (char *)space + bsize;
    902 		brelse(bp, 0);
    903 	}
    904 	/*
    905 	 * We no longer know anything about clusters per cylinder group.
    906 	 */
    907 	if (fs->fs_contigsumsize > 0) {
    908 		lp = fs->fs_maxcluster;
    909 		for (i = 0; i < fs->fs_ncg; i++)
    910 			*lp++ = fs->fs_contigsumsize;
    911 	}
    912 
    913 	vfs_vnode_iterator_init(mp, &marker);
    914 	while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) {
    915 		/*
    916 		 * Step 4: invalidate all inactive vnodes.
    917 		 */
    918 		if (vrecycle(vp))
    919 			continue;
    920 		/*
    921 		 * Step 5: invalidate all cached file data.
    922 		 */
    923 		if (vn_lock(vp, LK_EXCLUSIVE)) {
    924 			vrele(vp);
    925 			continue;
    926 		}
    927 		if (vinvalbuf(vp, 0, cred, l, 0, 0))
    928 			panic("%s: dirty2", __func__);
    929 		/*
    930 		 * Step 6: re-read inode data for all active vnodes.
    931 		 */
    932 		ip = VTOI(vp);
    933 		error = bread(devvp, FFS_FSBTODB(fs, ino_to_fsba(fs, ip->i_number)),
    934 			      (int)fs->fs_bsize, 0, &bp);
    935 		if (error) {
    936 			vput(vp);
    937 			break;
    938 		}
    939 		ffs_load_inode(bp, ip, fs, ip->i_number);
    940 		brelse(bp, 0);
    941 		vput(vp);
    942 	}
    943 	vfs_vnode_iterator_destroy(marker);
    944 	return (error);
    945 }
    946 
    947 /*
    948  * Possible superblock locations ordered from most to least likely.
    949  */
    950 static const int sblock_try[] = SBLOCKSEARCH;
    951 
    952 
    953 static int
    954 ffs_superblock_validate(struct fs *fs)
    955 {
    956 	int32_t i, fs_bshift = 0, fs_fshift = 0, fs_fragshift = 0, fs_frag;
    957 	int32_t fs_inopb;
    958 
    959 	/* Check the superblock size */
    960 	if (fs->fs_sbsize > SBLOCKSIZE || fs->fs_sbsize < sizeof(struct fs))
    961 		return 0;
    962 
    963 	/* Check the file system blocksize */
    964 	if (fs->fs_bsize > MAXBSIZE || fs->fs_bsize < MINBSIZE)
    965 		return 0;
    966 	if (!powerof2(fs->fs_bsize))
    967 		return 0;
    968 
    969 	/* Check the size of frag blocks */
    970 	if (!powerof2(fs->fs_fsize))
    971 		return 0;
    972 	if (fs->fs_fsize == 0)
    973 		return 0;
    974 
    975 	/*
    976 	 * XXX: these values are just zero-checked to prevent obvious
    977 	 * bugs. We need more strict checks.
    978 	 */
    979 	if (fs->fs_size == 0)
    980 		return 0;
    981 	if (fs->fs_cssize == 0)
    982 		return 0;
    983 	if (fs->fs_ipg == 0)
    984 		return 0;
    985 	if (fs->fs_fpg == 0)
    986 		return 0;
    987 	if (fs->fs_ncg == 0)
    988 		return 0;
    989 	if (fs->fs_maxbpg == 0)
    990 		return 0;
    991 
    992 	/* Check the number of inodes per block */
    993 	if (fs->fs_magic == FS_UFS1_MAGIC)
    994 		fs_inopb = fs->fs_bsize / sizeof(struct ufs1_dinode);
    995 	else /* fs->fs_magic == FS_UFS2_MAGIC */
    996 		fs_inopb = fs->fs_bsize / sizeof(struct ufs2_dinode);
    997 	if (fs->fs_inopb != fs_inopb)
    998 		return 0;
    999 
   1000 	/* Block size cannot be smaller than fragment size */
   1001 	if (fs->fs_bsize < fs->fs_fsize)
   1002 		return 0;
   1003 
   1004 	/* Compute fs_bshift and ensure it is consistent */
   1005 	for (i = fs->fs_bsize; i > 1; i >>= 1)
   1006 		fs_bshift++;
   1007 	if (fs->fs_bshift != fs_bshift)
   1008 		return 0;
   1009 
   1010 	/* Compute fs_fshift and ensure it is consistent */
   1011 	for (i = fs->fs_fsize; i > 1; i >>= 1)
   1012 		fs_fshift++;
   1013 	if (fs->fs_fshift != fs_fshift)
   1014 		return 0;
   1015 
   1016 	/* Compute fs_fragshift and ensure it is consistent */
   1017 	for (i = fs->fs_frag; i > 1; i >>= 1)
   1018 		fs_fragshift++;
   1019 	if (fs->fs_fragshift != fs_fragshift)
   1020 		return 0;
   1021 
   1022 	/* Check the masks */
   1023 	if (fs->fs_bmask != ~(fs->fs_bsize - 1))
   1024 		return 0;
   1025 	if (fs->fs_fmask != ~(fs->fs_fsize - 1))
   1026 		return 0;
   1027 
   1028 	/*
   1029 	 * Now that the shifts and masks are sanitized, we can use the ffs_ API.
   1030 	 */
   1031 
   1032 	/* Check the number of frag blocks */
   1033 	if ((fs_frag = ffs_numfrags(fs, fs->fs_bsize)) > MAXFRAG)
   1034 		return 0;
   1035 	if (fs->fs_frag != fs_frag)
   1036 		return 0;
   1037 
   1038 	/* Check the size of cylinder groups */
   1039 	if ((fs->fs_cgsize < sizeof(struct cg)) ||
   1040 	    (fs->fs_cgsize > fs->fs_bsize))
   1041 		return 0;
   1042 
   1043 	return 1;
   1044 }
   1045 
   1046 static int
   1047 ffs_is_appleufs(struct vnode *devvp, struct fs *fs)
   1048 {
   1049 	struct dkwedge_info dkw;
   1050 	int ret = 0;
   1051 
   1052 	/*
   1053 	 * First check to see if this is tagged as an Apple UFS filesystem
   1054 	 * in the disklabel.
   1055 	 */
   1056 	if (getdiskinfo(devvp, &dkw) == 0 &&
   1057 	    strcmp(dkw.dkw_ptype, DKW_PTYPE_APPLEUFS) == 0)
   1058 		ret = 1;
   1059 #ifdef APPLE_UFS
   1060 	else {
   1061 		struct appleufslabel *applefs;
   1062 		struct buf *bp;
   1063 		daddr_t blkno = APPLEUFS_LABEL_OFFSET / DEV_BSIZE;
   1064 		int error;
   1065 
   1066 		/*
   1067 		 * Manually look for an Apple UFS label, and if a valid one
   1068 		 * is found, then treat it like an Apple UFS filesystem anyway.
   1069 		 */
   1070 		error = bread(devvp, blkno, APPLEUFS_LABEL_SIZE, 0, &bp);
   1071 		if (error) {
   1072 			DPRINTF("bread@0x%jx returned %d", (intmax_t)blkno, error);
   1073 			return 0;
   1074 		}
   1075 		applefs = (struct appleufslabel *)bp->b_data;
   1076 		error = ffs_appleufs_validate(fs->fs_fsmnt, applefs, NULL);
   1077 		if (error == 0)
   1078 			ret = 1;
   1079 		brelse(bp, 0);
   1080 	}
   1081 #endif
   1082 
   1083 	return ret;
   1084 }
   1085 
   1086 /*
   1087  * Common code for mount and mountroot
   1088  */
   1089 int
   1090 ffs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
   1091 {
   1092 	struct ufsmount *ump = NULL;
   1093 	struct buf *bp = NULL;
   1094 	struct fs *fs = NULL;
   1095 	dev_t dev;
   1096 	void *space;
   1097 	daddr_t sblockloc = 0;
   1098 	int blks, fstype = 0;
   1099 	int error, i, bsize, ronly, bset = 0;
   1100 #ifdef FFS_EI
   1101 	int needswap = 0;		/* keep gcc happy */
   1102 #endif
   1103 	int32_t *lp;
   1104 	kauth_cred_t cred;
   1105 	u_int32_t allocsbsize, fs_sbsize = 0;
   1106 
   1107 	dev = devvp->v_rdev;
   1108 	cred = l ? l->l_cred : NOCRED;
   1109 
   1110 	/* Flush out any old buffers remaining from a previous use. */
   1111 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
   1112 	error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0);
   1113 	VOP_UNLOCK(devvp);
   1114 	if (error) {
   1115 		DPRINTF("vinvalbuf returned %d", error);
   1116 		return error;
   1117 	}
   1118 
   1119 	ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
   1120 
   1121 	error = fstrans_mount(mp);
   1122 	if (error) {
   1123 		DPRINTF("fstrans_mount returned %d", error);
   1124 		return error;
   1125 	}
   1126 
   1127 	ump = kmem_zalloc(sizeof(*ump), KM_SLEEP);
   1128 	mutex_init(&ump->um_lock, MUTEX_DEFAULT, IPL_NONE);
   1129 	error = ffs_snapshot_init(ump);
   1130 	if (error) {
   1131 		DPRINTF("ffs_snapshot_init returned %d", error);
   1132 		goto out;
   1133 	}
   1134 	ump->um_ops = &ffs_ufsops;
   1135 
   1136 #ifdef WAPBL
   1137  sbagain:
   1138 #endif
   1139 	/*
   1140 	 * Try reading the superblock in each of its possible locations.
   1141 	 */
   1142 	for (i = 0; ; i++) {
   1143 		daddr_t fs_sblockloc;
   1144 
   1145 		if (bp != NULL) {
   1146 			brelse(bp, BC_NOCACHE);
   1147 			bp = NULL;
   1148 		}
   1149 		if (sblock_try[i] == -1) {
   1150 			DPRINTF("no superblock found");
   1151 			error = EINVAL;
   1152 			fs = NULL;
   1153 			goto out;
   1154 		}
   1155 
   1156 		error = bread(devvp, sblock_try[i] / DEV_BSIZE, SBLOCKSIZE,
   1157 		    0, &bp);
   1158 		if (error) {
   1159 			DPRINTF("bread@0x%x returned %d",
   1160 			    sblock_try[i] / DEV_BSIZE, error);
   1161 			fs = NULL;
   1162 			goto out;
   1163 		}
   1164 		fs = (struct fs *)bp->b_data;
   1165 
   1166 		sblockloc = sblock_try[i];
   1167 		DPRINTF("fs_magic 0x%x", fs->fs_magic);
   1168 
   1169 		/*
   1170 		 * Swap: here, we swap fs->fs_sbsize in order to get the correct
   1171 		 * size to read the superblock. Once read, we swap the whole
   1172 		 * superblock structure.
   1173 		 */
   1174 		if (fs->fs_magic == FS_UFS1_MAGIC) {
   1175 			fs_sbsize = fs->fs_sbsize;
   1176 			fstype = UFS1;
   1177 #ifdef FFS_EI
   1178 			needswap = 0;
   1179 		} else if (fs->fs_magic == FS_UFS1_MAGIC_SWAPPED) {
   1180 			fs_sbsize = bswap32(fs->fs_sbsize);
   1181 			fstype = UFS1;
   1182 			needswap = 1;
   1183 #endif
   1184 		} else if (fs->fs_magic == FS_UFS2_MAGIC) {
   1185 			fs_sbsize = fs->fs_sbsize;
   1186 			fstype = UFS2;
   1187 #ifdef FFS_EI
   1188 			needswap = 0;
   1189 		} else if (fs->fs_magic == FS_UFS2_MAGIC_SWAPPED) {
   1190 			fs_sbsize = bswap32(fs->fs_sbsize);
   1191 			fstype = UFS2;
   1192 			needswap = 1;
   1193 #endif
   1194 		} else
   1195 			continue;
   1196 
   1197 		/* fs->fs_sblockloc isn't defined for old filesystems */
   1198 		if (fstype == UFS1 && !(fs->fs_old_flags & FS_FLAGS_UPDATED)) {
   1199 			if (sblockloc == SBLOCK_UFS2)
   1200 				/*
   1201 				 * This is likely to be the first alternate
   1202 				 * in a filesystem with 64k blocks.
   1203 				 * Don't use it.
   1204 				 */
   1205 				continue;
   1206 			fs_sblockloc = sblockloc;
   1207 		} else {
   1208 			fs_sblockloc = fs->fs_sblockloc;
   1209 #ifdef FFS_EI
   1210 			if (needswap)
   1211 				fs_sblockloc = bswap64(fs_sblockloc);
   1212 #endif
   1213 		}
   1214 
   1215 		/* Check we haven't found an alternate superblock */
   1216 		if (fs_sblockloc != sblockloc)
   1217 			continue;
   1218 
   1219 		/* Check the superblock size */
   1220 		if (fs_sbsize > SBLOCKSIZE || fs_sbsize < sizeof(struct fs))
   1221 			continue;
   1222 		fs = kmem_alloc((u_long)fs_sbsize, KM_SLEEP);
   1223 		memcpy(fs, bp->b_data, fs_sbsize);
   1224 
   1225 		/* Swap the whole superblock structure, if necessary. */
   1226 #ifdef FFS_EI
   1227 		if (needswap) {
   1228 			ffs_sb_swap((struct fs*)bp->b_data, fs);
   1229 			fs->fs_flags |= FS_SWAPPED;
   1230 		} else
   1231 #endif
   1232 			fs->fs_flags &= ~FS_SWAPPED;
   1233 
   1234 		/*
   1235 		 * Now that everything is swapped, the superblock is ready to
   1236 		 * be sanitized.
   1237 		 */
   1238 		if (!ffs_superblock_validate(fs)) {
   1239 			kmem_free(fs, fs_sbsize);
   1240 			continue;
   1241 		}
   1242 
   1243 		/* Ok seems to be a good superblock */
   1244 		break;
   1245 	}
   1246 
   1247 	ump->um_fs = fs;
   1248 
   1249 #ifdef WAPBL
   1250 	if ((mp->mnt_wapbl_replay == 0) && (fs->fs_flags & FS_DOWAPBL)) {
   1251 		error = ffs_wapbl_replay_start(mp, fs, devvp);
   1252 		if (error && (mp->mnt_flag & MNT_FORCE) == 0) {
   1253 			DPRINTF("ffs_wapbl_replay_start returned %d", error);
   1254 			goto out;
   1255 		}
   1256 		if (!error) {
   1257 			if (!ronly) {
   1258 				/* XXX fsmnt may be stale. */
   1259 				printf("%s: replaying log to disk\n",
   1260 				    fs->fs_fsmnt);
   1261 				error = wapbl_replay_write(mp->mnt_wapbl_replay,
   1262 				    devvp);
   1263 				if (error) {
   1264 					DPRINTF("wapbl_replay_write returned %d",
   1265 					    error);
   1266 					goto out;
   1267 				}
   1268 				wapbl_replay_stop(mp->mnt_wapbl_replay);
   1269 				fs->fs_clean = FS_WASCLEAN;
   1270 			} else {
   1271 				/* XXX fsmnt may be stale */
   1272 				printf("%s: replaying log to memory\n",
   1273 				    fs->fs_fsmnt);
   1274 			}
   1275 
   1276 			/* Force a re-read of the superblock */
   1277 			brelse(bp, BC_INVAL);
   1278 			bp = NULL;
   1279 			kmem_free(fs, fs_sbsize);
   1280 			fs = NULL;
   1281 			goto sbagain;
   1282 		}
   1283 	}
   1284 #else /* !WAPBL */
   1285 	if ((fs->fs_flags & FS_DOWAPBL) && (mp->mnt_flag & MNT_FORCE) == 0) {
   1286 		error = EPERM;
   1287 		DPRINTF("no force %d", error);
   1288 		goto out;
   1289 	}
   1290 #endif /* !WAPBL */
   1291 
   1292 	ffs_oldfscompat_read(fs, ump, sblockloc);
   1293 	ump->um_maxfilesize = fs->fs_maxfilesize;
   1294 
   1295 	if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
   1296 		uprintf("%s: unknown ufs flags: 0x%08"PRIx32"%s\n",
   1297 		    mp->mnt_stat.f_mntonname, fs->fs_flags,
   1298 		    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
   1299 		if ((mp->mnt_flag & MNT_FORCE) == 0) {
   1300 			error = EINVAL;
   1301 			DPRINTF("no force %d", error);
   1302 			goto out;
   1303 		}
   1304 	}
   1305 
   1306 	if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
   1307 		fs->fs_pendingblocks = 0;
   1308 		fs->fs_pendinginodes = 0;
   1309 	}
   1310 
   1311 	ump->um_fstype = fstype;
   1312 	if (fs->fs_sbsize < SBLOCKSIZE)
   1313 		brelse(bp, BC_INVAL);
   1314 	else
   1315 		brelse(bp, 0);
   1316 	bp = NULL;
   1317 
   1318 	if (ffs_is_appleufs(devvp, fs)) {
   1319 #ifdef APPLE_UFS
   1320 		ump->um_flags |= UFS_ISAPPLEUFS;
   1321 #else
   1322 		DPRINTF("AppleUFS not supported");
   1323 		error = EINVAL;
   1324 		goto out;
   1325 #endif
   1326 	}
   1327 
   1328 #if 0
   1329 /*
   1330  * XXX This code changes the behaviour of mounting dirty filesystems, to
   1331  * XXX require "mount -f ..." to mount them.  This doesn't match what
   1332  * XXX mount(8) describes and is disabled for now.
   1333  */
   1334 	/*
   1335 	 * If the file system is not clean, don't allow it to be mounted
   1336 	 * unless MNT_FORCE is specified.  (Note: MNT_FORCE is always set
   1337 	 * for the root file system.)
   1338 	 */
   1339 	if (fs->fs_flags & FS_DOWAPBL) {
   1340 		/*
   1341 		 * wapbl normally expects to be FS_WASCLEAN when the FS_DOWAPBL
   1342 		 * bit is set, although there's a window in unmount where it
   1343 		 * could be FS_ISCLEAN
   1344 		 */
   1345 		if ((mp->mnt_flag & MNT_FORCE) == 0 &&
   1346 		    (fs->fs_clean & (FS_WASCLEAN | FS_ISCLEAN)) == 0) {
   1347 			error = EPERM;
   1348 			goto out;
   1349 		}
   1350 	} else
   1351 		if ((fs->fs_clean & FS_ISCLEAN) == 0 &&
   1352 		    (mp->mnt_flag & MNT_FORCE) == 0) {
   1353 			error = EPERM;
   1354 			goto out;
   1355 		}
   1356 #endif
   1357 
   1358 	/*
   1359 	 * Verify that we can access the last block in the fs
   1360 	 * if we're mounting read/write.
   1361 	 */
   1362 	if (!ronly) {
   1363 		error = bread(devvp, FFS_FSBTODB(fs, fs->fs_size - 1),
   1364 		    fs->fs_fsize, 0, &bp);
   1365 		if (error) {
   1366 			DPRINTF("bread@0x%jx returned %d",
   1367 			    (intmax_t)FFS_FSBTODB(fs, fs->fs_size - 1),
   1368 			    error);
   1369 			bset = BC_INVAL;
   1370 			goto out;
   1371 		}
   1372 		if (bp->b_bcount != fs->fs_fsize) {
   1373 			DPRINTF("bcount %x != fsize %x", bp->b_bcount,
   1374 			    fs->fs_fsize);
   1375 			error = EINVAL;
   1376 			bset = BC_INVAL;
   1377 			goto out;
   1378 		}
   1379 		brelse(bp, BC_INVAL);
   1380 		bp = NULL;
   1381 	}
   1382 
   1383 	fs->fs_ronly = ronly;
   1384 	/* Don't bump fs_clean if we're replaying journal */
   1385 	if (!((fs->fs_flags & FS_DOWAPBL) && (fs->fs_clean & FS_WASCLEAN))) {
   1386 		if (ronly == 0) {
   1387 			fs->fs_clean <<= 1;
   1388 			fs->fs_fmod = 1;
   1389 		}
   1390 	}
   1391 
   1392 	bsize = fs->fs_cssize;
   1393 	blks = howmany(bsize, fs->fs_fsize);
   1394 	if (fs->fs_contigsumsize > 0)
   1395 		bsize += fs->fs_ncg * sizeof(int32_t);
   1396 	bsize += fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1397 	allocsbsize = bsize;
   1398 	space = kmem_alloc((u_long)allocsbsize, KM_SLEEP);
   1399 	fs->fs_csp = space;
   1400 
   1401 	for (i = 0; i < blks; i += fs->fs_frag) {
   1402 		bsize = fs->fs_bsize;
   1403 		if (i + fs->fs_frag > blks)
   1404 			bsize = (blks - i) * fs->fs_fsize;
   1405 		error = bread(devvp, FFS_FSBTODB(fs, fs->fs_csaddr + i), bsize,
   1406 			      0, &bp);
   1407 		if (error) {
   1408 			DPRINTF("bread@0x%jx %d",
   1409 			    (intmax_t)FFS_FSBTODB(fs, fs->fs_csaddr + i),
   1410 			    error);
   1411 			goto out1;
   1412 		}
   1413 #ifdef FFS_EI
   1414 		if (needswap)
   1415 			ffs_csum_swap((struct csum *)bp->b_data,
   1416 				(struct csum *)space, bsize);
   1417 		else
   1418 #endif
   1419 			memcpy(space, bp->b_data, (u_int)bsize);
   1420 
   1421 		space = (char *)space + bsize;
   1422 		brelse(bp, 0);
   1423 		bp = NULL;
   1424 	}
   1425 	if (fs->fs_contigsumsize > 0) {
   1426 		fs->fs_maxcluster = lp = space;
   1427 		for (i = 0; i < fs->fs_ncg; i++)
   1428 			*lp++ = fs->fs_contigsumsize;
   1429 		space = lp;
   1430 	}
   1431 	bsize = fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1432 	fs->fs_contigdirs = space;
   1433 	space = (char *)space + bsize;
   1434 	memset(fs->fs_contigdirs, 0, bsize);
   1435 
   1436 	/* Compatibility for old filesystems - XXX */
   1437 	if (fs->fs_avgfilesize <= 0)
   1438 		fs->fs_avgfilesize = AVFILESIZ;
   1439 	if (fs->fs_avgfpdir <= 0)
   1440 		fs->fs_avgfpdir = AFPDIR;
   1441 	fs->fs_active = NULL;
   1442 
   1443 	mp->mnt_data = ump;
   1444 	mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
   1445 	mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FFS);
   1446 	mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
   1447 	mp->mnt_stat.f_namemax = FFS_MAXNAMLEN;
   1448 	if (UFS_MPISAPPLEUFS(ump)) {
   1449 		/* NeXT used to keep short symlinks in the inode even
   1450 		 * when using FS_42INODEFMT.  In that case fs->fs_maxsymlinklen
   1451 		 * is probably -1, but we still need to be able to identify
   1452 		 * short symlinks.
   1453 		 */
   1454 		ump->um_maxsymlinklen = APPLEUFS_MAXSYMLINKLEN;
   1455 		ump->um_dirblksiz = APPLEUFS_DIRBLKSIZ;
   1456 		mp->mnt_iflag |= IMNT_DTYPE;
   1457 	} else {
   1458 		ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
   1459 		ump->um_dirblksiz = UFS_DIRBLKSIZ;
   1460 		if (ump->um_maxsymlinklen > 0)
   1461 			mp->mnt_iflag |= IMNT_DTYPE;
   1462 		else
   1463 			mp->mnt_iflag &= ~IMNT_DTYPE;
   1464 	}
   1465 	mp->mnt_fs_bshift = fs->fs_bshift;
   1466 	mp->mnt_dev_bshift = DEV_BSHIFT;	/* XXX */
   1467 	mp->mnt_flag |= MNT_LOCAL;
   1468 	mp->mnt_iflag |= IMNT_MPSAFE;
   1469 #ifdef FFS_EI
   1470 	if (needswap)
   1471 		ump->um_flags |= UFS_NEEDSWAP;
   1472 #endif
   1473 	ump->um_mountp = mp;
   1474 	ump->um_dev = dev;
   1475 	ump->um_devvp = devvp;
   1476 	ump->um_nindir = fs->fs_nindir;
   1477 	ump->um_lognindir = ffs(fs->fs_nindir) - 1;
   1478 	ump->um_bptrtodb = fs->fs_fshift - DEV_BSHIFT;
   1479 	ump->um_seqinc = fs->fs_frag;
   1480 	for (i = 0; i < MAXQUOTAS; i++)
   1481 		ump->um_quotas[i] = NULLVP;
   1482 	spec_node_setmountedfs(devvp, mp);
   1483 	if (ronly == 0 && fs->fs_snapinum[0] != 0)
   1484 		ffs_snapshot_mount(mp);
   1485 #ifdef WAPBL
   1486 	if (!ronly) {
   1487 		KDASSERT(fs->fs_ronly == 0);
   1488 		/*
   1489 		 * ffs_wapbl_start() needs mp->mnt_stat initialised if it
   1490 		 * needs to create a new log file in-filesystem.
   1491 		 */
   1492 		error = ffs_statvfs(mp, &mp->mnt_stat);
   1493 		if (error) {
   1494 			DPRINTF("ffs_statvfs returned %d", error);
   1495 			goto out1;
   1496 		}
   1497 
   1498 		error = ffs_wapbl_start(mp);
   1499 		if (error) {
   1500 			DPRINTF("ffs_wapbl_start returned %d", error);
   1501 			goto out1;
   1502 		}
   1503 	}
   1504 #endif /* WAPBL */
   1505 	if (ronly == 0) {
   1506 #ifdef QUOTA2
   1507 		error = ffs_quota2_mount(mp);
   1508 		if (error) {
   1509 			DPRINTF("ffs_quota2_mount returned %d", error);
   1510 			goto out1;
   1511 		}
   1512 #else
   1513 		if (fs->fs_flags & FS_DOQUOTA2) {
   1514 			ump->um_flags |= UFS_QUOTA2;
   1515 			uprintf("%s: options QUOTA2 not enabled%s\n",
   1516 			    mp->mnt_stat.f_mntonname,
   1517 			    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
   1518 			if ((mp->mnt_flag & MNT_FORCE) == 0) {
   1519 				error = EINVAL;
   1520 				DPRINTF("quota disabled %d", error);
   1521 				goto out1;
   1522 			}
   1523 		}
   1524 #endif
   1525 	 }
   1526 
   1527 	if (mp->mnt_flag & MNT_DISCARD)
   1528 		ump->um_discarddata = ffs_discard_init(devvp, fs);
   1529 
   1530 	return (0);
   1531 out1:
   1532 	kmem_free(fs->fs_csp, allocsbsize);
   1533 out:
   1534 #ifdef WAPBL
   1535 	if (mp->mnt_wapbl_replay) {
   1536 		wapbl_replay_stop(mp->mnt_wapbl_replay);
   1537 		wapbl_replay_free(mp->mnt_wapbl_replay);
   1538 		mp->mnt_wapbl_replay = 0;
   1539 	}
   1540 #endif
   1541 
   1542 	fstrans_unmount(mp);
   1543 	if (fs)
   1544 		kmem_free(fs, fs->fs_sbsize);
   1545 	spec_node_setmountedfs(devvp, NULL);
   1546 	if (bp)
   1547 		brelse(bp, bset);
   1548 	if (ump) {
   1549 		if (ump->um_oldfscompat)
   1550 			kmem_free(ump->um_oldfscompat, 512 + 3*sizeof(int32_t));
   1551 		mutex_destroy(&ump->um_lock);
   1552 		kmem_free(ump, sizeof(*ump));
   1553 		mp->mnt_data = NULL;
   1554 	}
   1555 	return (error);
   1556 }
   1557 
   1558 /*
   1559  * Sanity checks for loading old filesystem superblocks.
   1560  * See ffs_oldfscompat_write below for unwound actions.
   1561  *
   1562  * XXX - Parts get retired eventually.
   1563  * Unfortunately new bits get added.
   1564  */
   1565 static void
   1566 ffs_oldfscompat_read(struct fs *fs, struct ufsmount *ump, daddr_t sblockloc)
   1567 {
   1568 	off_t maxfilesize;
   1569 	int32_t *extrasave;
   1570 
   1571 	if ((fs->fs_magic != FS_UFS1_MAGIC) ||
   1572 	    (fs->fs_old_flags & FS_FLAGS_UPDATED))
   1573 		return;
   1574 
   1575 	if (!ump->um_oldfscompat)
   1576 		ump->um_oldfscompat = kmem_alloc(512 + 3*sizeof(int32_t),
   1577 		    KM_SLEEP);
   1578 
   1579 	memcpy(ump->um_oldfscompat, &fs->fs_old_postbl_start, 512);
   1580 	extrasave = ump->um_oldfscompat;
   1581 	extrasave += 512/sizeof(int32_t);
   1582 	extrasave[0] = fs->fs_old_npsect;
   1583 	extrasave[1] = fs->fs_old_interleave;
   1584 	extrasave[2] = fs->fs_old_trackskew;
   1585 
   1586 	/* These fields will be overwritten by their
   1587 	 * original values in fs_oldfscompat_write, so it is harmless
   1588 	 * to modify them here.
   1589 	 */
   1590 	fs->fs_cstotal.cs_ndir = fs->fs_old_cstotal.cs_ndir;
   1591 	fs->fs_cstotal.cs_nbfree = fs->fs_old_cstotal.cs_nbfree;
   1592 	fs->fs_cstotal.cs_nifree = fs->fs_old_cstotal.cs_nifree;
   1593 	fs->fs_cstotal.cs_nffree = fs->fs_old_cstotal.cs_nffree;
   1594 
   1595 	fs->fs_maxbsize = fs->fs_bsize;
   1596 	fs->fs_time = fs->fs_old_time;
   1597 	fs->fs_size = fs->fs_old_size;
   1598 	fs->fs_dsize = fs->fs_old_dsize;
   1599 	fs->fs_csaddr = fs->fs_old_csaddr;
   1600 	fs->fs_sblockloc = sblockloc;
   1601 
   1602 	fs->fs_flags = fs->fs_old_flags | (fs->fs_flags & FS_INTERNAL);
   1603 
   1604 	if (fs->fs_old_postblformat == FS_42POSTBLFMT) {
   1605 		fs->fs_old_nrpos = 8;
   1606 		fs->fs_old_npsect = fs->fs_old_nsect;
   1607 		fs->fs_old_interleave = 1;
   1608 		fs->fs_old_trackskew = 0;
   1609 	}
   1610 
   1611 	if (fs->fs_old_inodefmt < FS_44INODEFMT) {
   1612 		fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
   1613 		fs->fs_qbmask = ~fs->fs_bmask;
   1614 		fs->fs_qfmask = ~fs->fs_fmask;
   1615 	}
   1616 
   1617 	maxfilesize = (u_int64_t)0x80000000 * fs->fs_bsize - 1;
   1618 	if (fs->fs_maxfilesize > maxfilesize)
   1619 		fs->fs_maxfilesize = maxfilesize;
   1620 
   1621 	/* Compatibility for old filesystems */
   1622 	if (fs->fs_avgfilesize <= 0)
   1623 		fs->fs_avgfilesize = AVFILESIZ;
   1624 	if (fs->fs_avgfpdir <= 0)
   1625 		fs->fs_avgfpdir = AFPDIR;
   1626 
   1627 #if 0
   1628 	if (bigcgs) {
   1629 		fs->fs_save_cgsize = fs->fs_cgsize;
   1630 		fs->fs_cgsize = fs->fs_bsize;
   1631 	}
   1632 #endif
   1633 }
   1634 
   1635 /*
   1636  * Unwinding superblock updates for old filesystems.
   1637  * See ffs_oldfscompat_read above for details.
   1638  *
   1639  * XXX - Parts get retired eventually.
   1640  * Unfortunately new bits get added.
   1641  */
   1642 static void
   1643 ffs_oldfscompat_write(struct fs *fs, struct ufsmount *ump)
   1644 {
   1645 	int32_t *extrasave;
   1646 
   1647 	if ((fs->fs_magic != FS_UFS1_MAGIC) ||
   1648 	    (fs->fs_old_flags & FS_FLAGS_UPDATED))
   1649 		return;
   1650 
   1651 	fs->fs_old_time = fs->fs_time;
   1652 	fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir;
   1653 	fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree;
   1654 	fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree;
   1655 	fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree;
   1656 	fs->fs_old_flags = fs->fs_flags;
   1657 
   1658 #if 0
   1659 	if (bigcgs) {
   1660 		fs->fs_cgsize = fs->fs_save_cgsize;
   1661 	}
   1662 #endif
   1663 
   1664 	memcpy(&fs->fs_old_postbl_start, ump->um_oldfscompat, 512);
   1665 	extrasave = ump->um_oldfscompat;
   1666 	extrasave += 512/sizeof(int32_t);
   1667 	fs->fs_old_npsect = extrasave[0];
   1668 	fs->fs_old_interleave = extrasave[1];
   1669 	fs->fs_old_trackskew = extrasave[2];
   1670 
   1671 }
   1672 
   1673 /*
   1674  * unmount vfs operation
   1675  */
   1676 int
   1677 ffs_unmount(struct mount *mp, int mntflags)
   1678 {
   1679 	struct lwp *l = curlwp;
   1680 	struct ufsmount *ump = VFSTOUFS(mp);
   1681 	struct fs *fs = ump->um_fs;
   1682 	int error, flags;
   1683 	u_int32_t bsize;
   1684 #ifdef WAPBL
   1685 	extern int doforce;
   1686 #endif
   1687 
   1688 	if (ump->um_discarddata) {
   1689 		ffs_discard_finish(ump->um_discarddata, mntflags);
   1690 		ump->um_discarddata = NULL;
   1691 	}
   1692 
   1693 	flags = 0;
   1694 	if (mntflags & MNT_FORCE)
   1695 		flags |= FORCECLOSE;
   1696 	if ((error = ffs_flushfiles(mp, flags, l)) != 0)
   1697 		return (error);
   1698 	error = UFS_WAPBL_BEGIN(mp);
   1699 	if (error == 0)
   1700 		if (fs->fs_ronly == 0 &&
   1701 		    ffs_cgupdate(ump, MNT_WAIT) == 0 &&
   1702 		    fs->fs_clean & FS_WASCLEAN) {
   1703 			fs->fs_clean = FS_ISCLEAN;
   1704 			fs->fs_fmod = 0;
   1705 			(void) ffs_sbupdate(ump, MNT_WAIT);
   1706 		}
   1707 	if (error == 0)
   1708 		UFS_WAPBL_END(mp);
   1709 #ifdef WAPBL
   1710 	KASSERT(!(mp->mnt_wapbl_replay && mp->mnt_wapbl));
   1711 	if (mp->mnt_wapbl_replay) {
   1712 		KDASSERT(fs->fs_ronly);
   1713 		wapbl_replay_stop(mp->mnt_wapbl_replay);
   1714 		wapbl_replay_free(mp->mnt_wapbl_replay);
   1715 		mp->mnt_wapbl_replay = 0;
   1716 	}
   1717 	error = ffs_wapbl_stop(mp, doforce && (mntflags & MNT_FORCE));
   1718 	if (error) {
   1719 		return error;
   1720 	}
   1721 #endif /* WAPBL */
   1722 
   1723 	if (ump->um_devvp->v_type != VBAD)
   1724 		spec_node_setmountedfs(ump->um_devvp, NULL);
   1725 	vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1726 	(void)VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD | FWRITE,
   1727 		NOCRED);
   1728 	vput(ump->um_devvp);
   1729 
   1730 	bsize = fs->fs_cssize;
   1731 	if (fs->fs_contigsumsize > 0)
   1732 		bsize += fs->fs_ncg * sizeof(int32_t);
   1733 	bsize += fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1734 	kmem_free(fs->fs_csp, bsize);
   1735 
   1736 	kmem_free(fs, fs->fs_sbsize);
   1737 	if (ump->um_oldfscompat != NULL)
   1738 		kmem_free(ump->um_oldfscompat, 512 + 3*sizeof(int32_t));
   1739 	mutex_destroy(&ump->um_lock);
   1740 	ffs_snapshot_fini(ump);
   1741 	kmem_free(ump, sizeof(*ump));
   1742 	mp->mnt_data = NULL;
   1743 	mp->mnt_flag &= ~MNT_LOCAL;
   1744 	fstrans_unmount(mp);
   1745 	return (0);
   1746 }
   1747 
   1748 /*
   1749  * Flush out all the files in a filesystem.
   1750  */
   1751 int
   1752 ffs_flushfiles(struct mount *mp, int flags, struct lwp *l)
   1753 {
   1754 	extern int doforce;
   1755 	struct ufsmount *ump;
   1756 	int error;
   1757 
   1758 	if (!doforce)
   1759 		flags &= ~FORCECLOSE;
   1760 	ump = VFSTOUFS(mp);
   1761 #ifdef QUOTA
   1762 	if ((error = quota1_umount(mp, flags)) != 0)
   1763 		return (error);
   1764 #endif
   1765 #ifdef QUOTA2
   1766 	if ((error = quota2_umount(mp, flags)) != 0)
   1767 		return (error);
   1768 #endif
   1769 #ifdef UFS_EXTATTR
   1770 	if (ump->um_fstype == UFS1) {
   1771 		if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)
   1772 			ufs_extattr_stop(mp, l);
   1773 		if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED)
   1774 			ufs_extattr_uepm_destroy(&ump->um_extattr);
   1775 		mp->mnt_flag &= ~MNT_EXTATTR;
   1776 	}
   1777 #endif
   1778 	if ((error = vflush(mp, 0, SKIPSYSTEM | flags)) != 0)
   1779 		return (error);
   1780 	ffs_snapshot_unmount(mp);
   1781 	/*
   1782 	 * Flush all the files.
   1783 	 */
   1784 	error = vflush(mp, NULLVP, flags);
   1785 	if (error)
   1786 		return (error);
   1787 	/*
   1788 	 * Flush filesystem metadata.
   1789 	 */
   1790 	vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1791 	error = VOP_FSYNC(ump->um_devvp, l->l_cred, FSYNC_WAIT, 0, 0);
   1792 	VOP_UNLOCK(ump->um_devvp);
   1793 	if (flags & FORCECLOSE) /* XXXDBJ */
   1794 		error = 0;
   1795 
   1796 #ifdef WAPBL
   1797 	if (error)
   1798 		return error;
   1799 	if (mp->mnt_wapbl) {
   1800 		error = wapbl_flush(mp->mnt_wapbl, 1);
   1801 		if (flags & FORCECLOSE)
   1802 			error = 0;
   1803 	}
   1804 #endif
   1805 
   1806 	return (error);
   1807 }
   1808 
   1809 /*
   1810  * Get file system statistics.
   1811  */
   1812 int
   1813 ffs_statvfs(struct mount *mp, struct statvfs *sbp)
   1814 {
   1815 	struct ufsmount *ump;
   1816 	struct fs *fs;
   1817 
   1818 	ump = VFSTOUFS(mp);
   1819 	fs = ump->um_fs;
   1820 	mutex_enter(&ump->um_lock);
   1821 	sbp->f_bsize = fs->fs_bsize;
   1822 	sbp->f_frsize = fs->fs_fsize;
   1823 	sbp->f_iosize = fs->fs_bsize;
   1824 	sbp->f_blocks = fs->fs_dsize;
   1825 	sbp->f_bfree = ffs_blkstofrags(fs, fs->fs_cstotal.cs_nbfree) +
   1826 	    fs->fs_cstotal.cs_nffree + FFS_DBTOFSB(fs, fs->fs_pendingblocks);
   1827 	sbp->f_bresvd = ((u_int64_t) fs->fs_dsize * (u_int64_t)
   1828 	    fs->fs_minfree) / (u_int64_t) 100;
   1829 	if (sbp->f_bfree > sbp->f_bresvd)
   1830 		sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd;
   1831 	else
   1832 		sbp->f_bavail = 0;
   1833 	sbp->f_files =  fs->fs_ncg * fs->fs_ipg - UFS_ROOTINO;
   1834 	sbp->f_ffree = fs->fs_cstotal.cs_nifree + fs->fs_pendinginodes;
   1835 	sbp->f_favail = sbp->f_ffree;
   1836 	sbp->f_fresvd = 0;
   1837 	mutex_exit(&ump->um_lock);
   1838 	copy_statvfs_info(sbp, mp);
   1839 
   1840 	return (0);
   1841 }
   1842 
   1843 struct ffs_sync_ctx {
   1844 	int waitfor;
   1845 	bool is_suspending;
   1846 };
   1847 
   1848 static bool
   1849 ffs_sync_selector(void *cl, struct vnode *vp)
   1850 {
   1851 	struct ffs_sync_ctx *c = cl;
   1852 	struct inode *ip;
   1853 
   1854 	ip = VTOI(vp);
   1855 	/*
   1856 	 * Skip the vnode/inode if inaccessible.
   1857 	 */
   1858 	if (ip == NULL || vp->v_type == VNON)
   1859 		return false;
   1860 
   1861 	/*
   1862 	 * We deliberately update inode times here.  This will
   1863 	 * prevent a massive queue of updates accumulating, only
   1864 	 * to be handled by a call to unmount.
   1865 	 *
   1866 	 * XXX It would be better to have the syncer trickle these
   1867 	 * out.  Adjustment needed to allow registering vnodes for
   1868 	 * sync when the vnode is clean, but the inode dirty.  Or
   1869 	 * have ufs itself trickle out inode updates.
   1870 	 *
   1871 	 * If doing a lazy sync, we don't care about metadata or
   1872 	 * data updates, because they are handled by each vnode's
   1873 	 * synclist entry.  In this case we are only interested in
   1874 	 * writing back modified inodes.
   1875 	 */
   1876 	if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE |
   1877 	    IN_MODIFY | IN_MODIFIED | IN_ACCESSED)) == 0 &&
   1878 	    (c->waitfor == MNT_LAZY || (LIST_EMPTY(&vp->v_dirtyblkhd) &&
   1879 	    UVM_OBJ_IS_CLEAN(&vp->v_uobj))))
   1880 		return false;
   1881 
   1882 	if (vp->v_type == VBLK && c->is_suspending)
   1883 		return false;
   1884 
   1885 	return true;
   1886 }
   1887 
   1888 /*
   1889  * Go through the disk queues to initiate sandbagged IO;
   1890  * go through the inodes to write those that have been modified;
   1891  * initiate the writing of the super block if it has been modified.
   1892  *
   1893  * Note: we are always called with the filesystem marked `MPBUSY'.
   1894  */
   1895 int
   1896 ffs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
   1897 {
   1898 	struct vnode *vp;
   1899 	struct ufsmount *ump = VFSTOUFS(mp);
   1900 	struct fs *fs;
   1901 	struct vnode_iterator *marker;
   1902 	int error, allerror = 0;
   1903 	bool is_suspending;
   1904 	struct ffs_sync_ctx ctx;
   1905 
   1906 	fs = ump->um_fs;
   1907 	if (fs->fs_fmod != 0 && fs->fs_ronly != 0) {		/* XXX */
   1908 		panic("%s: rofs mod, fs=%s", __func__, fs->fs_fsmnt);
   1909 	}
   1910 
   1911 	fstrans_start(mp, FSTRANS_SHARED);
   1912 	is_suspending = (fstrans_getstate(mp) == FSTRANS_SUSPENDING);
   1913 	/*
   1914 	 * Write back each (modified) inode.
   1915 	 */
   1916 	vfs_vnode_iterator_init(mp, &marker);
   1917 
   1918 	ctx.waitfor = waitfor;
   1919 	ctx.is_suspending = is_suspending;
   1920 	while ((vp = vfs_vnode_iterator_next(marker, ffs_sync_selector, &ctx)))
   1921 	{
   1922 		error = vn_lock(vp, LK_EXCLUSIVE);
   1923 		if (error) {
   1924 			vrele(vp);
   1925 			continue;
   1926 		}
   1927 		if (waitfor == MNT_LAZY) {
   1928 			error = UFS_WAPBL_BEGIN(vp->v_mount);
   1929 			if (!error) {
   1930 				error = ffs_update(vp, NULL, NULL,
   1931 				    UPDATE_CLOSE);
   1932 				UFS_WAPBL_END(vp->v_mount);
   1933 			}
   1934 		} else {
   1935 			error = VOP_FSYNC(vp, cred, FSYNC_NOLOG |
   1936 			    (waitfor == MNT_WAIT ? FSYNC_WAIT : 0), 0, 0);
   1937 		}
   1938 		if (error)
   1939 			allerror = error;
   1940 		vput(vp);
   1941 	}
   1942 	vfs_vnode_iterator_destroy(marker);
   1943 
   1944 	/*
   1945 	 * Force stale file system control information to be flushed.
   1946 	 */
   1947 	if (waitfor != MNT_LAZY && (ump->um_devvp->v_numoutput > 0 ||
   1948 	    !LIST_EMPTY(&ump->um_devvp->v_dirtyblkhd))) {
   1949 		vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1950 		if ((error = VOP_FSYNC(ump->um_devvp, cred,
   1951 		    (waitfor == MNT_WAIT ? FSYNC_WAIT : 0) | FSYNC_NOLOG,
   1952 		    0, 0)) != 0)
   1953 			allerror = error;
   1954 		VOP_UNLOCK(ump->um_devvp);
   1955 	}
   1956 #if defined(QUOTA) || defined(QUOTA2)
   1957 	qsync(mp);
   1958 #endif
   1959 	/*
   1960 	 * Write back modified superblock.
   1961 	 */
   1962 	if (fs->fs_fmod != 0) {
   1963 		fs->fs_fmod = 0;
   1964 		fs->fs_time = time_second;
   1965 		error = UFS_WAPBL_BEGIN(mp);
   1966 		if (error)
   1967 			allerror = error;
   1968 		else {
   1969 			if ((error = ffs_cgupdate(ump, waitfor)))
   1970 				allerror = error;
   1971 			UFS_WAPBL_END(mp);
   1972 		}
   1973 	}
   1974 
   1975 #ifdef WAPBL
   1976 	if (mp->mnt_wapbl) {
   1977 		error = wapbl_flush(mp->mnt_wapbl, 0);
   1978 		if (error)
   1979 			allerror = error;
   1980 	}
   1981 #endif
   1982 
   1983 	fstrans_done(mp);
   1984 	return (allerror);
   1985 }
   1986 
   1987 /*
   1988  * Load inode from disk and initialize vnode.
   1989  */
   1990 static int
   1991 ffs_init_vnode(struct ufsmount *ump, struct vnode *vp, ino_t ino)
   1992 {
   1993 	struct fs *fs;
   1994 	struct inode *ip;
   1995 	struct buf *bp;
   1996 	int error;
   1997 
   1998 	fs = ump->um_fs;
   1999 
   2000 	/* Read in the disk contents for the inode. */
   2001 	error = bread(ump->um_devvp, FFS_FSBTODB(fs, ino_to_fsba(fs, ino)),
   2002 		      (int)fs->fs_bsize, 0, &bp);
   2003 	if (error)
   2004 		return error;
   2005 
   2006 	/* Allocate and initialize inode. */
   2007 	ip = pool_cache_get(ffs_inode_cache, PR_WAITOK);
   2008 	memset(ip, 0, sizeof(struct inode));
   2009 	ip->i_ump = ump;
   2010 	ip->i_fs = fs;
   2011 	ip->i_dev = ump->um_dev;
   2012 	ip->i_number = ino;
   2013 	if (ump->um_fstype == UFS1)
   2014 		ip->i_din.ffs1_din = pool_cache_get(ffs_dinode1_cache,
   2015 		    PR_WAITOK);
   2016 	else
   2017 		ip->i_din.ffs2_din = pool_cache_get(ffs_dinode2_cache,
   2018 		    PR_WAITOK);
   2019 	ffs_load_inode(bp, ip, fs, ino);
   2020 	brelse(bp, 0);
   2021 	ip->i_vnode = vp;
   2022 #if defined(QUOTA) || defined(QUOTA2)
   2023 	ufsquota_init(ip);
   2024 #endif
   2025 
   2026 	/* Initialise vnode with this inode. */
   2027 	vp->v_tag = VT_UFS;
   2028 	vp->v_op = ffs_vnodeop_p;
   2029 	vp->v_vflag |= VV_LOCKSWORK;
   2030 	vp->v_data = ip;
   2031 
   2032 	/* Initialize genfs node. */
   2033 	genfs_node_init(vp, &ffs_genfsops);
   2034 
   2035 	return 0;
   2036 }
   2037 
   2038 /*
   2039  * Undo ffs_init_vnode().
   2040  */
   2041 static void
   2042 ffs_deinit_vnode(struct ufsmount *ump, struct vnode *vp)
   2043 {
   2044 	struct inode *ip = VTOI(vp);
   2045 
   2046 	if (ump->um_fstype == UFS1)
   2047 		pool_cache_put(ffs_dinode1_cache, ip->i_din.ffs1_din);
   2048 	else
   2049 		pool_cache_put(ffs_dinode2_cache, ip->i_din.ffs2_din);
   2050 	pool_cache_put(ffs_inode_cache, ip);
   2051 
   2052 	genfs_node_destroy(vp);
   2053 	vp->v_data = NULL;
   2054 }
   2055 
   2056 /*
   2057  * Read an inode from disk and initialize this vnode / inode pair.
   2058  * Caller assures no other thread will try to load this inode.
   2059  */
   2060 int
   2061 ffs_loadvnode(struct mount *mp, struct vnode *vp,
   2062     const void *key, size_t key_len, const void **new_key)
   2063 {
   2064 	ino_t ino;
   2065 	struct fs *fs;
   2066 	struct inode *ip;
   2067 	struct ufsmount *ump;
   2068 	int error;
   2069 
   2070 	KASSERT(key_len == sizeof(ino));
   2071 	memcpy(&ino, key, key_len);
   2072 	ump = VFSTOUFS(mp);
   2073 	fs = ump->um_fs;
   2074 
   2075 	error = ffs_init_vnode(ump, vp, ino);
   2076 	if (error)
   2077 		return error;
   2078 
   2079 	ip = VTOI(vp);
   2080 	if (ip->i_mode == 0) {
   2081 		ffs_deinit_vnode(ump, vp);
   2082 
   2083 		return ENOENT;
   2084 	}
   2085 
   2086 	/* Initialize the vnode from the inode. */
   2087 	ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
   2088 
   2089 	/* Finish inode initialization.  */
   2090 	ip->i_devvp = ump->um_devvp;
   2091 	vref(ip->i_devvp);
   2092 
   2093 	/*
   2094 	 * Ensure that uid and gid are correct. This is a temporary
   2095 	 * fix until fsck has been changed to do the update.
   2096 	 */
   2097 
   2098 	if (fs->fs_old_inodefmt < FS_44INODEFMT) {		/* XXX */
   2099 		ip->i_uid = ip->i_ffs1_ouid;			/* XXX */
   2100 		ip->i_gid = ip->i_ffs1_ogid;			/* XXX */
   2101 	}							/* XXX */
   2102 	uvm_vnp_setsize(vp, ip->i_size);
   2103 	*new_key = &ip->i_number;
   2104 	return 0;
   2105 }
   2106 
   2107 /*
   2108  * Create a new inode on disk and initialize this vnode / inode pair.
   2109  */
   2110 int
   2111 ffs_newvnode(struct mount *mp, struct vnode *dvp, struct vnode *vp,
   2112     struct vattr *vap, kauth_cred_t cred,
   2113     size_t *key_len, const void **new_key)
   2114 {
   2115 	ino_t ino;
   2116 	struct fs *fs;
   2117 	struct inode *ip;
   2118 	struct timespec ts;
   2119 	struct ufsmount *ump;
   2120 	int error, mode;
   2121 
   2122 	KASSERT(dvp->v_mount == mp);
   2123 	KASSERT(vap->va_type != VNON);
   2124 
   2125 	*key_len = sizeof(ino);
   2126 	ump = VFSTOUFS(mp);
   2127 	fs = ump->um_fs;
   2128 	mode = MAKEIMODE(vap->va_type, vap->va_mode);
   2129 
   2130 	/* Allocate fresh inode. */
   2131 	error = ffs_valloc(dvp, mode, cred, &ino);
   2132 	if (error)
   2133 		return error;
   2134 
   2135 	/* Attach inode to vnode. */
   2136 	error = ffs_init_vnode(ump, vp, ino);
   2137 	if (error) {
   2138 		if (UFS_WAPBL_BEGIN(mp) == 0) {
   2139 			ffs_vfree(dvp, ino, mode);
   2140 			UFS_WAPBL_END(mp);
   2141 		}
   2142 		return error;
   2143 	}
   2144 
   2145 	ip = VTOI(vp);
   2146 	if (ip->i_mode) {
   2147 		panic("%s: dup alloc ino=%" PRId64 " on %s: mode %x/%x "
   2148 		    "gen %x/%x size %" PRIx64 " blocks %" PRIx64,
   2149 		    __func__, ino, fs->fs_fsmnt, DIP(ip, mode), ip->i_mode,
   2150 		    DIP(ip, gen), ip->i_gen, DIP(ip, size), DIP(ip, blocks));
   2151 	}
   2152 	if (DIP(ip, size) || DIP(ip, blocks)) {
   2153 		printf("%s: ino=%" PRId64 " on %s: "
   2154 		    "gen %x/%x has non zero blocks %" PRIx64 " or size %"
   2155 		    PRIx64 "\n",
   2156 		    __func__, ino, fs->fs_fsmnt, DIP(ip, gen), ip->i_gen,
   2157 		    DIP(ip, blocks), DIP(ip, size));
   2158 		if ((ip)->i_ump->um_fstype == UFS1)
   2159 			panic("%s: dirty filesystem?", __func__);
   2160 		DIP_ASSIGN(ip, blocks, 0);
   2161 		DIP_ASSIGN(ip, size, 0);
   2162 	}
   2163 
   2164 	/* Set uid / gid. */
   2165 	if (cred == NOCRED || cred == FSCRED) {
   2166 		ip->i_gid = 0;
   2167 		ip->i_uid = 0;
   2168 	} else {
   2169 		ip->i_gid = VTOI(dvp)->i_gid;
   2170 		ip->i_uid = kauth_cred_geteuid(cred);
   2171 	}
   2172 	DIP_ASSIGN(ip, gid, ip->i_gid);
   2173 	DIP_ASSIGN(ip, uid, ip->i_uid);
   2174 
   2175 #if defined(QUOTA) || defined(QUOTA2)
   2176 	error = UFS_WAPBL_BEGIN(mp);
   2177 	if (error) {
   2178 		ffs_deinit_vnode(ump, vp);
   2179 
   2180 		return error;
   2181 	}
   2182 	error = chkiq(ip, 1, cred, 0);
   2183 	if (error) {
   2184 		ffs_vfree(dvp, ino, mode);
   2185 		UFS_WAPBL_END(mp);
   2186 		ffs_deinit_vnode(ump, vp);
   2187 
   2188 		return error;
   2189 	}
   2190 	UFS_WAPBL_END(mp);
   2191 #endif
   2192 
   2193 	/* Set type and finalize. */
   2194 	ip->i_flags = 0;
   2195 	DIP_ASSIGN(ip, flags, 0);
   2196 	ip->i_mode = mode;
   2197 	DIP_ASSIGN(ip, mode, mode);
   2198 	if (vap->va_rdev != VNOVAL) {
   2199 		/*
   2200 		 * Want to be able to use this to make badblock
   2201 		 * inodes, so don't truncate the dev number.
   2202 		 */
   2203 		if (ump->um_fstype == UFS1)
   2204 			ip->i_ffs1_rdev = ufs_rw32(vap->va_rdev,
   2205 			    UFS_MPNEEDSWAP(ump));
   2206 		else
   2207 			ip->i_ffs2_rdev = ufs_rw64(vap->va_rdev,
   2208 			    UFS_MPNEEDSWAP(ump));
   2209 	}
   2210 	ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
   2211 	ip->i_devvp = ump->um_devvp;
   2212 	vref(ip->i_devvp);
   2213 
   2214 	/* Set up a new generation number for this inode.  */
   2215 	ip->i_gen++;
   2216 	DIP_ASSIGN(ip, gen, ip->i_gen);
   2217 	if (fs->fs_magic == FS_UFS2_MAGIC) {
   2218 		vfs_timestamp(&ts);
   2219 		ip->i_ffs2_birthtime = ts.tv_sec;
   2220 		ip->i_ffs2_birthnsec = ts.tv_nsec;
   2221 	}
   2222 
   2223 	uvm_vnp_setsize(vp, ip->i_size);
   2224 	*new_key = &ip->i_number;
   2225 	return 0;
   2226 }
   2227 
   2228 /*
   2229  * File handle to vnode
   2230  *
   2231  * Have to be really careful about stale file handles:
   2232  * - check that the inode number is valid
   2233  * - call ffs_vget() to get the locked inode
   2234  * - check for an unallocated inode (i_mode == 0)
   2235  * - check that the given client host has export rights and return
   2236  *   those rights via. exflagsp and credanonp
   2237  */
   2238 int
   2239 ffs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
   2240 {
   2241 	struct ufid ufh;
   2242 	int error;
   2243 
   2244 	if (fhp->fid_len != sizeof(struct ufid))
   2245 		return EINVAL;
   2246 
   2247 	memcpy(&ufh, fhp, sizeof(ufh));
   2248 	if ((error = ffs_checkrange(mp, ufh.ufid_ino)) != 0)
   2249 		return error;
   2250 
   2251 	return (ufs_fhtovp(mp, &ufh, vpp));
   2252 }
   2253 
   2254 /*
   2255  * Vnode pointer to File handle
   2256  */
   2257 /* ARGSUSED */
   2258 int
   2259 ffs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
   2260 {
   2261 	struct inode *ip;
   2262 	struct ufid ufh;
   2263 
   2264 	if (*fh_size < sizeof(struct ufid)) {
   2265 		*fh_size = sizeof(struct ufid);
   2266 		return E2BIG;
   2267 	}
   2268 	ip = VTOI(vp);
   2269 	*fh_size = sizeof(struct ufid);
   2270 	memset(&ufh, 0, sizeof(ufh));
   2271 	ufh.ufid_len = sizeof(struct ufid);
   2272 	ufh.ufid_ino = ip->i_number;
   2273 	ufh.ufid_gen = ip->i_gen;
   2274 	memcpy(fhp, &ufh, sizeof(ufh));
   2275 	return (0);
   2276 }
   2277 
   2278 void
   2279 ffs_init(void)
   2280 {
   2281 	if (ffs_initcount++ > 0)
   2282 		return;
   2283 
   2284 	ffs_inode_cache = pool_cache_init(sizeof(struct inode), 0, 0, 0,
   2285 	    "ffsino", NULL, IPL_NONE, NULL, NULL, NULL);
   2286 	ffs_dinode1_cache = pool_cache_init(sizeof(struct ufs1_dinode), 0, 0, 0,
   2287 	    "ffsdino1", NULL, IPL_NONE, NULL, NULL, NULL);
   2288 	ffs_dinode2_cache = pool_cache_init(sizeof(struct ufs2_dinode), 0, 0, 0,
   2289 	    "ffsdino2", NULL, IPL_NONE, NULL, NULL, NULL);
   2290 	ufs_init();
   2291 }
   2292 
   2293 void
   2294 ffs_reinit(void)
   2295 {
   2296 	ufs_reinit();
   2297 }
   2298 
   2299 void
   2300 ffs_done(void)
   2301 {
   2302 	if (--ffs_initcount > 0)
   2303 		return;
   2304 
   2305 	ufs_done();
   2306 	pool_cache_destroy(ffs_dinode2_cache);
   2307 	pool_cache_destroy(ffs_dinode1_cache);
   2308 	pool_cache_destroy(ffs_inode_cache);
   2309 }
   2310 
   2311 /*
   2312  * Write a superblock and associated information back to disk.
   2313  */
   2314 int
   2315 ffs_sbupdate(struct ufsmount *mp, int waitfor)
   2316 {
   2317 	struct fs *fs = mp->um_fs;
   2318 	struct buf *bp;
   2319 	int error;
   2320 	u_int32_t saveflag;
   2321 
   2322 	error = ffs_getblk(mp->um_devvp,
   2323 	    fs->fs_sblockloc / DEV_BSIZE, FFS_NOBLK,
   2324 	    fs->fs_sbsize, false, &bp);
   2325 	if (error)
   2326 		return error;
   2327 	saveflag = fs->fs_flags & FS_INTERNAL;
   2328 	fs->fs_flags &= ~FS_INTERNAL;
   2329 
   2330 	memcpy(bp->b_data, fs, fs->fs_sbsize);
   2331 
   2332 	ffs_oldfscompat_write((struct fs *)bp->b_data, mp);
   2333 #ifdef FFS_EI
   2334 	if (mp->um_flags & UFS_NEEDSWAP)
   2335 		ffs_sb_swap((struct fs *)bp->b_data, (struct fs *)bp->b_data);
   2336 #endif
   2337 	fs->fs_flags |= saveflag;
   2338 
   2339 	if (waitfor == MNT_WAIT)
   2340 		error = bwrite(bp);
   2341 	else
   2342 		bawrite(bp);
   2343 	return (error);
   2344 }
   2345 
   2346 int
   2347 ffs_cgupdate(struct ufsmount *mp, int waitfor)
   2348 {
   2349 	struct fs *fs = mp->um_fs;
   2350 	struct buf *bp;
   2351 	int blks;
   2352 	void *space;
   2353 	int i, size, error = 0, allerror = 0;
   2354 
   2355 	allerror = ffs_sbupdate(mp, waitfor);
   2356 	blks = howmany(fs->fs_cssize, fs->fs_fsize);
   2357 	space = fs->fs_csp;
   2358 	for (i = 0; i < blks; i += fs->fs_frag) {
   2359 		size = fs->fs_bsize;
   2360 		if (i + fs->fs_frag > blks)
   2361 			size = (blks - i) * fs->fs_fsize;
   2362 		error = ffs_getblk(mp->um_devvp, FFS_FSBTODB(fs, fs->fs_csaddr + i),
   2363 		    FFS_NOBLK, size, false, &bp);
   2364 		if (error)
   2365 			break;
   2366 #ifdef FFS_EI
   2367 		if (mp->um_flags & UFS_NEEDSWAP)
   2368 			ffs_csum_swap((struct csum*)space,
   2369 			    (struct csum*)bp->b_data, size);
   2370 		else
   2371 #endif
   2372 			memcpy(bp->b_data, space, (u_int)size);
   2373 		space = (char *)space + size;
   2374 		if (waitfor == MNT_WAIT)
   2375 			error = bwrite(bp);
   2376 		else
   2377 			bawrite(bp);
   2378 	}
   2379 	if (!allerror && error)
   2380 		allerror = error;
   2381 	return (allerror);
   2382 }
   2383 
   2384 int
   2385 ffs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
   2386     int attrnamespace, const char *attrname)
   2387 {
   2388 #ifdef UFS_EXTATTR
   2389 	/*
   2390 	 * File-backed extended attributes are only supported on UFS1.
   2391 	 * UFS2 has native extended attributes.
   2392 	 */
   2393 	if (VFSTOUFS(mp)->um_fstype == UFS1)
   2394 		return (ufs_extattrctl(mp, cmd, vp, attrnamespace, attrname));
   2395 #endif
   2396 	return (vfs_stdextattrctl(mp, cmd, vp, attrnamespace, attrname));
   2397 }
   2398 
   2399 int
   2400 ffs_suspendctl(struct mount *mp, int cmd)
   2401 {
   2402 	int error;
   2403 	struct lwp *l = curlwp;
   2404 
   2405 	switch (cmd) {
   2406 	case SUSPEND_SUSPEND:
   2407 		if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0)
   2408 			return error;
   2409 		error = ffs_sync(mp, MNT_WAIT, l->l_proc->p_cred);
   2410 		if (error == 0)
   2411 			error = fstrans_setstate(mp, FSTRANS_SUSPENDED);
   2412 #ifdef WAPBL
   2413 		if (error == 0 && mp->mnt_wapbl)
   2414 			error = wapbl_flush(mp->mnt_wapbl, 1);
   2415 #endif
   2416 		if (error != 0) {
   2417 			(void) fstrans_setstate(mp, FSTRANS_NORMAL);
   2418 			return error;
   2419 		}
   2420 		return 0;
   2421 
   2422 	case SUSPEND_RESUME:
   2423 		return fstrans_setstate(mp, FSTRANS_NORMAL);
   2424 
   2425 	default:
   2426 		return EINVAL;
   2427 	}
   2428 }
   2429 
   2430 /*
   2431  * Synch vnode for a mounted file system.
   2432  */
   2433 static int
   2434 ffs_vfs_fsync(vnode_t *vp, int flags)
   2435 {
   2436 	int error, i, pflags;
   2437 #ifdef WAPBL
   2438 	struct mount *mp;
   2439 #endif
   2440 
   2441 	KASSERT(vp->v_type == VBLK);
   2442 	KASSERT(spec_node_getmountedfs(vp) != NULL);
   2443 
   2444 	/*
   2445 	 * Flush all dirty data associated with the vnode.
   2446 	 */
   2447 	pflags = PGO_ALLPAGES | PGO_CLEANIT;
   2448 	if ((flags & FSYNC_WAIT) != 0)
   2449 		pflags |= PGO_SYNCIO;
   2450 	mutex_enter(vp->v_interlock);
   2451 	error = VOP_PUTPAGES(vp, 0, 0, pflags);
   2452 	if (error)
   2453 		return error;
   2454 
   2455 #ifdef WAPBL
   2456 	mp = spec_node_getmountedfs(vp);
   2457 	if (mp && mp->mnt_wapbl) {
   2458 		/*
   2459 		 * Don't bother writing out metadata if the syncer is
   2460 		 * making the request.  We will let the sync vnode
   2461 		 * write it out in a single burst through a call to
   2462 		 * VFS_SYNC().
   2463 		 */
   2464 		if ((flags & (FSYNC_DATAONLY | FSYNC_LAZY | FSYNC_NOLOG)) != 0)
   2465 			return 0;
   2466 
   2467 		/*
   2468 		 * Don't flush the log if the vnode being flushed
   2469 		 * contains no dirty buffers that could be in the log.
   2470 		 */
   2471 		if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
   2472 			error = wapbl_flush(mp->mnt_wapbl, 0);
   2473 			if (error)
   2474 				return error;
   2475 		}
   2476 
   2477 		if ((flags & FSYNC_WAIT) != 0) {
   2478 			mutex_enter(vp->v_interlock);
   2479 			while (vp->v_numoutput)
   2480 				cv_wait(&vp->v_cv, vp->v_interlock);
   2481 			mutex_exit(vp->v_interlock);
   2482 		}
   2483 
   2484 		return 0;
   2485 	}
   2486 #endif /* WAPBL */
   2487 
   2488 	error = vflushbuf(vp, flags);
   2489 	if (error == 0 && (flags & FSYNC_CACHE) != 0) {
   2490 		i = 1;
   2491 		(void)VOP_IOCTL(vp, DIOCCACHESYNC, &i, FWRITE,
   2492 		    kauth_cred_get());
   2493 	}
   2494 
   2495 	return error;
   2496 }
   2497