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ffs_vfsops.c revision 1.362.2.2
      1 /*	$NetBSD: ffs_vfsops.c,v 1.362.2.2 2025/01/07 16:16:50 martin 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 1.362.2.2 2025/01/07 16:16:50 martin 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/fstrans.h>
     79 #include <sys/socket.h>
     80 #include <sys/mount.h>
     81 #include <sys/buf.h>
     82 #include <sys/device.h>
     83 #include <sys/disk.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/module.h>
     96 
     97 #include <miscfs/genfs/genfs.h>
     98 #include <miscfs/specfs/specdev.h>
     99 
    100 #include <ufs/ufs/quota.h>
    101 #include <ufs/ufs/ufsmount.h>
    102 #include <ufs/ufs/inode.h>
    103 #include <ufs/ufs/dir.h>
    104 #include <ufs/ufs/ufs_extern.h>
    105 #include <ufs/ufs/ufs_bswap.h>
    106 #include <ufs/ufs/ufs_wapbl.h>
    107 
    108 #include <ufs/ffs/fs.h>
    109 #include <ufs/ffs/ffs_extern.h>
    110 
    111 #ifdef WAPBL
    112 MODULE(MODULE_CLASS_VFS, ffs, "ufs,wapbl");
    113 #else
    114 MODULE(MODULE_CLASS_VFS, ffs, "ufs");
    115 #endif
    116 
    117 static int ffs_vfs_fsync(vnode_t *, int);
    118 static int ffs_superblock_validate(struct fs *);
    119 static int ffs_is_appleufs(struct vnode *, struct fs *);
    120 
    121 static int ffs_init_vnode(struct ufsmount *, struct vnode *, ino_t);
    122 static void ffs_deinit_vnode(struct ufsmount *, struct vnode *);
    123 
    124 static struct sysctllog *ffs_sysctl_log;
    125 
    126 static kauth_listener_t ffs_snapshot_listener;
    127 
    128 /* how many times ffs_init() was called */
    129 int ffs_initcount = 0;
    130 
    131 #ifdef DEBUG_FFS_MOUNT
    132 #define DPRINTF(_fmt, args...)	printf("%s: " _fmt "\n", __func__, ##args)
    133 #else
    134 #define DPRINTF(_fmt, args...)	do {} while (/*CONSTCOND*/0)
    135 #endif
    136 
    137 extern const struct vnodeopv_desc ffs_vnodeop_opv_desc;
    138 extern const struct vnodeopv_desc ffs_specop_opv_desc;
    139 extern const struct vnodeopv_desc ffs_fifoop_opv_desc;
    140 
    141 const struct vnodeopv_desc * const ffs_vnodeopv_descs[] = {
    142 	&ffs_vnodeop_opv_desc,
    143 	&ffs_specop_opv_desc,
    144 	&ffs_fifoop_opv_desc,
    145 	NULL,
    146 };
    147 
    148 struct vfsops ffs_vfsops = {
    149 	.vfs_name = MOUNT_FFS,
    150 	.vfs_min_mount_data = sizeof (struct ufs_args),
    151 	.vfs_mount = ffs_mount,
    152 	.vfs_start = ufs_start,
    153 	.vfs_unmount = ffs_unmount,
    154 	.vfs_root = ufs_root,
    155 	.vfs_quotactl = ufs_quotactl,
    156 	.vfs_statvfs = ffs_statvfs,
    157 	.vfs_sync = ffs_sync,
    158 	.vfs_vget = ufs_vget,
    159 	.vfs_loadvnode = ffs_loadvnode,
    160 	.vfs_newvnode = ffs_newvnode,
    161 	.vfs_fhtovp = ffs_fhtovp,
    162 	.vfs_vptofh = ffs_vptofh,
    163 	.vfs_init = ffs_init,
    164 	.vfs_reinit = ffs_reinit,
    165 	.vfs_done = ffs_done,
    166 	.vfs_mountroot = ffs_mountroot,
    167 	.vfs_snapshot = ffs_snapshot,
    168 	.vfs_extattrctl = ffs_extattrctl,
    169 	.vfs_suspendctl = genfs_suspendctl,
    170 	.vfs_renamelock_enter = genfs_renamelock_enter,
    171 	.vfs_renamelock_exit = genfs_renamelock_exit,
    172 	.vfs_fsync = ffs_vfs_fsync,
    173 	.vfs_opv_descs = ffs_vnodeopv_descs
    174 };
    175 
    176 static const struct genfs_ops ffs_genfsops = {
    177 	.gop_size = ffs_gop_size,
    178 	.gop_alloc = ufs_gop_alloc,
    179 	.gop_write = genfs_gop_write,
    180 	.gop_markupdate = ufs_gop_markupdate,
    181 	.gop_putrange = genfs_gop_putrange,
    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);
    382 		vfs_rele(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);
    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 
    413 	if (args == NULL) {
    414 		DPRINTF("NULL args");
    415 		return EINVAL;
    416 	}
    417 	if (*data_len < sizeof(*args)) {
    418 		DPRINTF("bad size args %zu != %zu", *data_len, sizeof(*args));
    419 		return EINVAL;
    420 	}
    421 
    422 	ump = VFSTOUFS(mp);
    423 	if ((mp->mnt_flag & (MNT_GETARGS|MNT_UPDATE)) && ump == NULL) {
    424 		DPRINTF("no ump");
    425 		return EIO;
    426 	}
    427 
    428 	if (mp->mnt_flag & MNT_GETARGS) {
    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 		if (!update) {
    439 			/* New mounts must have a filename for the device */
    440 			DPRINTF("no filename for mount");
    441 			return EINVAL;
    442 		}
    443 	} else {
    444 		/*
    445 		 * Look up the name and verify that it's sane.
    446 		 */
    447 		error = namei_simple_user(args->fspec,
    448 		    NSM_FOLLOW_NOEMULROOT, &devvp);
    449 		if (error != 0) {
    450 			DPRINTF("namei_simple_user returned %d", error);
    451 			return error;
    452 		}
    453 
    454 		/*
    455 		 * Be sure this is a valid block device
    456 		 */
    457 		if (devvp->v_type != VBLK) {
    458 			DPRINTF("non block device %d", devvp->v_type);
    459 			error = ENOTBLK;
    460 			goto fail;
    461 		}
    462 
    463 		if (bdevsw_lookup(devvp->v_rdev) == NULL) {
    464 			DPRINTF("can't find block device 0x%jx",
    465 			    devvp->v_rdev);
    466 			error = ENXIO;
    467 			goto fail;
    468 		}
    469 
    470 		if (update) {
    471 			/*
    472 			 * Be sure we're still naming the same device
    473 			 * used for our initial mount
    474 			 */
    475 			if (devvp != ump->um_devvp &&
    476 			    devvp->v_rdev != ump->um_devvp->v_rdev) {
    477 				DPRINTF("wrong device 0x%jx != 0x%jx",
    478 				    (uintmax_t)devvp->v_rdev,
    479 				    (uintmax_t)ump->um_devvp->v_rdev);
    480 				error = EINVAL;
    481 				goto fail;
    482 			}
    483 			vrele(devvp);
    484 			devvp = NULL;
    485 		}
    486 	}
    487 
    488 	if (devvp == NULL) {
    489 		devvp = ump->um_devvp;
    490 		vref(devvp);
    491 	}
    492 
    493 	/*
    494 	 * If mount by non-root, then verify that user has necessary
    495 	 * permissions on the device.
    496 	 *
    497 	 * Permission to update a mount is checked higher, so here we presume
    498 	 * updating the mount is okay (for example, as far as securelevel goes)
    499 	 * which leaves us with the normal check.
    500 	 */
    501 	accessmode = VREAD;
    502 	if (update ? (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
    503 	    (mp->mnt_flag & MNT_RDONLY) == 0)
    504 		accessmode |= VWRITE;
    505 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    506 	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
    507 	    KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode));
    508 	VOP_UNLOCK(devvp);
    509 	if (error) {
    510 		DPRINTF("kauth returned %d", error);
    511 		goto fail;
    512 	}
    513 
    514 #ifdef WAPBL
    515 	/* WAPBL can only be enabled on a r/w mount. */
    516 	if (((mp->mnt_flag & MNT_RDONLY) && !(mp->mnt_iflag & IMNT_WANTRDWR)) ||
    517 	    (mp->mnt_iflag & IMNT_WANTRDONLY)) {
    518 		mp->mnt_flag &= ~MNT_LOG;
    519 	}
    520 #else /* !WAPBL */
    521 	mp->mnt_flag &= ~MNT_LOG;
    522 #endif /* !WAPBL */
    523 
    524 	if (!update) {
    525 		int xflags;
    526 
    527 		if (mp->mnt_flag & MNT_RDONLY)
    528 			xflags = FREAD;
    529 		else
    530 			xflags = FREAD | FWRITE;
    531 		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    532 		error = VOP_OPEN(devvp, xflags, FSCRED);
    533 		VOP_UNLOCK(devvp);
    534 		if (error) {
    535 			DPRINTF("VOP_OPEN returned %d", error);
    536 			goto fail;
    537 		}
    538 		error = ffs_mountfs(devvp, mp, l);
    539 		if (error) {
    540 			DPRINTF("ffs_mountfs returned %d", error);
    541 			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    542 			(void)VOP_CLOSE(devvp, xflags, NOCRED);
    543 			VOP_UNLOCK(devvp);
    544 			goto fail;
    545 		}
    546 
    547 		ump = VFSTOUFS(mp);
    548 		fs = ump->um_fs;
    549 	} else {
    550 		/*
    551 		 * Update the mount.  The file system is suspended.
    552 		 */
    553 		KASSERT(fstrans_is_owner(mp));
    554 
    555 		/*
    556 		 * The initial mount got a reference on this
    557 		 * device, so drop the one obtained via
    558 		 * namei(), above.
    559 		 */
    560 		vrele(devvp);
    561 
    562 		ump = VFSTOUFS(mp);
    563 		fs = ump->um_fs;
    564 		if (fs->fs_ronly == 0 && (mp->mnt_iflag & IMNT_WANTRDONLY)) {
    565 			/*
    566 			 * Changing from r/w to r/o
    567 			 */
    568 			flags = WRITECLOSE;
    569 			if (mp->mnt_flag & MNT_FORCE)
    570 				flags |= FORCECLOSE;
    571 			error = ffs_flushfiles(mp, flags, l);
    572 			if (error)
    573 				return error;
    574 
    575 			error = UFS_WAPBL_BEGIN(mp);
    576 			if (error) {
    577 				DPRINTF("wapbl %d", error);
    578 				return error;
    579 			}
    580 
    581 			if (ffs_cgupdate(ump, MNT_WAIT) == 0 &&
    582 			    fs->fs_clean & FS_WASCLEAN) {
    583 				if (mp->mnt_flag & MNT_SOFTDEP)
    584 					fs->fs_flags &= ~FS_DOSOFTDEP;
    585 				fs->fs_clean = FS_ISCLEAN;
    586 				(void) ffs_sbupdate(ump, MNT_WAIT);
    587 			}
    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_iflag & IMNT_WANTRDONLY)) {
    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 (UFS_WAPBL_BEGIN(mp) == 0) {
    695 		mutex_enter(&ump->um_lock);
    696 		if (fs->fs_fmod != 0) {
    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 "
    702 				    "(fs_clean=%#x); please fsck(8)\n",
    703 				    mp->mnt_stat.f_mntfromname, fs->fs_clean);
    704 				printf("%s: lost blocks %" PRId64
    705 				    " files %d\n", mp->mnt_stat.f_mntfromname,
    706 				    fs->fs_pendingblocks, fs->fs_pendinginodes);
    707 			}
    708 			mutex_exit(&ump->um_lock);
    709 			(void) ffs_cgupdate(ump, MNT_WAIT);
    710 		} else {
    711 			mutex_exit(&ump->um_lock);
    712 		}
    713 		UFS_WAPBL_END(mp);
    714 	}
    715 	if ((mp->mnt_flag & MNT_SOFTDEP) != 0) {
    716 		printf("%s: `-o softdep' is no longer supported, "
    717 		    "consider `-o log'\n", mp->mnt_stat.f_mntfromname);
    718 		mp->mnt_flag &= ~MNT_SOFTDEP;
    719 	}
    720 
    721 	return (error);
    722 
    723 fail:
    724 	vrele(devvp);
    725 	return (error);
    726 }
    727 
    728 /*
    729  * Reload all incore data for a filesystem (used after running fsck on
    730  * the root filesystem and finding things to fix). The filesystem must
    731  * be mounted read-only.
    732  *
    733  * Things to do to update the mount:
    734  *	1) invalidate all cached meta-data.
    735  *	2) re-read superblock from disk.
    736  *	3) re-read summary information from disk.
    737  *	4) invalidate all inactive vnodes.
    738  *	5) invalidate all cached file data.
    739  *	6) re-read inode data for all active vnodes.
    740  */
    741 int
    742 ffs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l)
    743 {
    744 	struct vnode *vp, *devvp;
    745 	struct inode *ip;
    746 	void *space;
    747 	struct buf *bp;
    748 	struct fs *fs, *newfs;
    749 	int i, bsize, blks, error;
    750 	int32_t *lp, fs_sbsize;
    751 	struct ufsmount *ump;
    752 	daddr_t sblockloc;
    753 	struct vnode_iterator *marker;
    754 
    755 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
    756 		return (EINVAL);
    757 
    758 	ump = VFSTOUFS(mp);
    759 
    760 	/*
    761 	 * Step 1: invalidate all cached meta-data.
    762 	 */
    763 	devvp = ump->um_devvp;
    764 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
    765 	error = vinvalbuf(devvp, 0, cred, l, 0, 0);
    766 	VOP_UNLOCK(devvp);
    767 	if (error)
    768 		panic("%s: dirty1", __func__);
    769 
    770 	/*
    771 	 * Step 2: re-read superblock from disk. XXX: We don't handle
    772 	 * possibility that superblock moved. Which implies that we don't
    773 	 * want its size to change either.
    774 	 */
    775 	fs = ump->um_fs;
    776 	fs_sbsize = fs->fs_sbsize;
    777 	error = bread(devvp, fs->fs_sblockloc / DEV_BSIZE, fs_sbsize,
    778 		      0, &bp);
    779 	if (error)
    780 		return (error);
    781 	newfs = kmem_alloc(fs_sbsize, KM_SLEEP);
    782 	memcpy(newfs, bp->b_data, fs_sbsize);
    783 
    784 #ifdef FFS_EI
    785 	if (ump->um_flags & UFS_NEEDSWAP) {
    786 		ffs_sb_swap((struct fs *)bp->b_data, newfs);
    787 		newfs->fs_flags |= FS_SWAPPED;
    788 	} else
    789 #endif
    790 		newfs->fs_flags &= ~FS_SWAPPED;
    791 
    792 	brelse(bp, 0);
    793 
    794 	if ((newfs->fs_magic != FS_UFS1_MAGIC) &&
    795 	    (newfs->fs_magic != FS_UFS2_MAGIC)) {
    796 		kmem_free(newfs, fs_sbsize);
    797 		return (EIO);		/* XXX needs translation */
    798 	}
    799 	if (!ffs_superblock_validate(newfs)) {
    800 		kmem_free(newfs, fs_sbsize);
    801 		return (EINVAL);
    802 	}
    803 
    804 	/*
    805 	 * The current implementation doesn't handle the possibility that
    806 	 * these values may have changed.
    807 	 */
    808 	if ((newfs->fs_sbsize != fs_sbsize) ||
    809 	    (newfs->fs_cssize != fs->fs_cssize) ||
    810 	    (newfs->fs_contigsumsize != fs->fs_contigsumsize) ||
    811 	    (newfs->fs_ncg != fs->fs_ncg)) {
    812 		kmem_free(newfs, fs_sbsize);
    813 		return (EINVAL);
    814 	}
    815 
    816 	/* Store off old fs_sblockloc for fs_oldfscompat_read. */
    817 	sblockloc = fs->fs_sblockloc;
    818 	/*
    819 	 * Copy pointer fields back into superblock before copying in	XXX
    820 	 * new superblock. These should really be in the ufsmount.	XXX
    821 	 * Note that important parameters (eg fs_ncg) are unchanged.
    822 	 */
    823 	newfs->fs_csp = fs->fs_csp;
    824 	newfs->fs_maxcluster = fs->fs_maxcluster;
    825 	newfs->fs_contigdirs = fs->fs_contigdirs;
    826 	newfs->fs_ronly = fs->fs_ronly;
    827 	newfs->fs_active = fs->fs_active;
    828 	memcpy(fs, newfs, (u_int)fs_sbsize);
    829 	kmem_free(newfs, fs_sbsize);
    830 
    831 	/*
    832 	 * Recheck for Apple UFS filesystem.
    833 	 */
    834 	ump->um_flags &= ~UFS_ISAPPLEUFS;
    835 	if (ffs_is_appleufs(devvp, fs)) {
    836 #ifdef APPLE_UFS
    837 		ump->um_flags |= UFS_ISAPPLEUFS;
    838 #else
    839 		DPRINTF("AppleUFS not supported");
    840 		return (EIO); /* XXX: really? */
    841 #endif
    842 	}
    843 
    844 	if (UFS_MPISAPPLEUFS(ump)) {
    845 		/* see comment about NeXT below */
    846 		ump->um_maxsymlinklen = APPLEUFS_MAXSYMLINKLEN;
    847 		ump->um_dirblksiz = APPLEUFS_DIRBLKSIZ;
    848 		mp->mnt_iflag |= IMNT_DTYPE;
    849 	} else {
    850 		ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
    851 		ump->um_dirblksiz = UFS_DIRBLKSIZ;
    852 		if (ump->um_maxsymlinklen > 0)
    853 			mp->mnt_iflag |= IMNT_DTYPE;
    854 		else
    855 			mp->mnt_iflag &= ~IMNT_DTYPE;
    856 	}
    857 	ffs_oldfscompat_read(fs, ump, sblockloc);
    858 
    859 	mutex_enter(&ump->um_lock);
    860 	ump->um_maxfilesize = fs->fs_maxfilesize;
    861 	if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
    862 		uprintf("%s: unknown ufs flags: 0x%08"PRIx32"%s\n",
    863 		    mp->mnt_stat.f_mntonname, fs->fs_flags,
    864 		    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
    865 		if ((mp->mnt_flag & MNT_FORCE) == 0) {
    866 			mutex_exit(&ump->um_lock);
    867 			return (EINVAL);
    868 		}
    869 	}
    870 	if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
    871 		fs->fs_pendingblocks = 0;
    872 		fs->fs_pendinginodes = 0;
    873 	}
    874 	mutex_exit(&ump->um_lock);
    875 
    876 	ffs_statvfs(mp, &mp->mnt_stat);
    877 	/*
    878 	 * Step 3: re-read summary information from disk.
    879 	 */
    880 	blks = howmany(fs->fs_cssize, fs->fs_fsize);
    881 	space = fs->fs_csp;
    882 	for (i = 0; i < blks; i += fs->fs_frag) {
    883 		bsize = fs->fs_bsize;
    884 		if (i + fs->fs_frag > blks)
    885 			bsize = (blks - i) * fs->fs_fsize;
    886 		error = bread(devvp, FFS_FSBTODB(fs, fs->fs_csaddr + i), bsize,
    887 			      0, &bp);
    888 		if (error) {
    889 			return (error);
    890 		}
    891 #ifdef FFS_EI
    892 		if (UFS_FSNEEDSWAP(fs))
    893 			ffs_csum_swap((struct csum *)bp->b_data,
    894 			    (struct csum *)space, bsize);
    895 		else
    896 #endif
    897 			memcpy(space, bp->b_data, (size_t)bsize);
    898 		space = (char *)space + bsize;
    899 		brelse(bp, 0);
    900 	}
    901 	/*
    902 	 * We no longer know anything about clusters per cylinder group.
    903 	 */
    904 	if (fs->fs_contigsumsize > 0) {
    905 		lp = fs->fs_maxcluster;
    906 		for (i = 0; i < fs->fs_ncg; i++)
    907 			*lp++ = fs->fs_contigsumsize;
    908 	}
    909 
    910 	vfs_vnode_iterator_init(mp, &marker);
    911 	while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) {
    912 		/*
    913 		 * Step 4: invalidate all inactive vnodes.
    914 		 */
    915 		if (vrecycle(vp))
    916 			continue;
    917 		/*
    918 		 * Step 5: invalidate all cached file data.
    919 		 */
    920 		if (vn_lock(vp, LK_EXCLUSIVE)) {
    921 			vrele(vp);
    922 			continue;
    923 		}
    924 		if (vinvalbuf(vp, 0, cred, l, 0, 0))
    925 			panic("%s: dirty2", __func__);
    926 		/*
    927 		 * Step 6: re-read inode data for all active vnodes.
    928 		 */
    929 		ip = VTOI(vp);
    930 		error = bread(devvp, FFS_FSBTODB(fs, ino_to_fsba(fs, ip->i_number)),
    931 			      (int)fs->fs_bsize, 0, &bp);
    932 		if (error) {
    933 			vput(vp);
    934 			break;
    935 		}
    936 		ffs_load_inode(bp, ip, fs, ip->i_number);
    937 		brelse(bp, 0);
    938 		vput(vp);
    939 	}
    940 	vfs_vnode_iterator_destroy(marker);
    941 	return (error);
    942 }
    943 
    944 /*
    945  * Possible superblock locations ordered from most to least likely.
    946  */
    947 static const int sblock_try[] = SBLOCKSEARCH;
    948 
    949 
    950 static int
    951 ffs_superblock_validate(struct fs *fs)
    952 {
    953 	int32_t i, fs_bshift = 0, fs_fshift = 0, fs_fragshift = 0, fs_frag;
    954 	int32_t fs_inopb;
    955 
    956 	/* Check the superblock size */
    957 	if (fs->fs_sbsize > SBLOCKSIZE || fs->fs_sbsize < sizeof(struct fs))
    958 		return 0;
    959 
    960 	/* Check the file system blocksize */
    961 	if (fs->fs_bsize > MAXBSIZE || fs->fs_bsize < MINBSIZE)
    962 		return 0;
    963 	if (!powerof2(fs->fs_bsize))
    964 		return 0;
    965 
    966 	/* Check the size of frag blocks */
    967 	if (!powerof2(fs->fs_fsize))
    968 		return 0;
    969 	if (fs->fs_fsize == 0)
    970 		return 0;
    971 
    972 	/*
    973 	 * XXX: these values are just zero-checked to prevent obvious
    974 	 * bugs. We need more strict checks.
    975 	 */
    976 	if (fs->fs_size == 0 && fs->fs_old_size == 0)
    977 		return 0;
    978 	if (fs->fs_cssize == 0)
    979 		return 0;
    980 	if (fs->fs_ipg == 0)
    981 		return 0;
    982 	if (fs->fs_fpg == 0)
    983 		return 0;
    984 	if (fs->fs_ncg == 0)
    985 		return 0;
    986 	if (fs->fs_maxbpg == 0)
    987 		return 0;
    988 
    989 	/* Check the number of inodes per block */
    990 	if (fs->fs_magic == FS_UFS1_MAGIC)
    991 		fs_inopb = fs->fs_bsize / sizeof(struct ufs1_dinode);
    992 	else /* fs->fs_magic == FS_UFS2_MAGIC */
    993 		fs_inopb = fs->fs_bsize / sizeof(struct ufs2_dinode);
    994 	if (fs->fs_inopb != fs_inopb)
    995 		return 0;
    996 
    997 	/* Block size cannot be smaller than fragment size */
    998 	if (fs->fs_bsize < fs->fs_fsize)
    999 		return 0;
   1000 
   1001 	/* Compute fs_bshift and ensure it is consistent */
   1002 	for (i = fs->fs_bsize; i > 1; i >>= 1)
   1003 		fs_bshift++;
   1004 	if (fs->fs_bshift != fs_bshift)
   1005 		return 0;
   1006 
   1007 	/* Compute fs_fshift and ensure it is consistent */
   1008 	for (i = fs->fs_fsize; i > 1; i >>= 1)
   1009 		fs_fshift++;
   1010 	if (fs->fs_fshift != fs_fshift)
   1011 		return 0;
   1012 
   1013 	/* Compute fs_fragshift and ensure it is consistent */
   1014 	for (i = fs->fs_frag; i > 1; i >>= 1)
   1015 		fs_fragshift++;
   1016 	if (fs->fs_fragshift != fs_fragshift)
   1017 		return 0;
   1018 
   1019 	/* Check the masks */
   1020 	if (fs->fs_bmask != ~(fs->fs_bsize - 1))
   1021 		return 0;
   1022 	if (fs->fs_fmask != ~(fs->fs_fsize - 1))
   1023 		return 0;
   1024 
   1025 	/*
   1026 	 * Now that the shifts and masks are sanitized, we can use the ffs_ API.
   1027 	 */
   1028 
   1029 	/* Check the number of frag blocks */
   1030 	if ((fs_frag = ffs_numfrags(fs, fs->fs_bsize)) > MAXFRAG)
   1031 		return 0;
   1032 	if (fs->fs_frag != fs_frag)
   1033 		return 0;
   1034 
   1035 	/* Check the size of cylinder groups */
   1036 	if ((fs->fs_cgsize < sizeof(struct cg)) ||
   1037 	    (fs->fs_cgsize > fs->fs_bsize))
   1038 		return 0;
   1039 
   1040 	return 1;
   1041 }
   1042 
   1043 static int
   1044 ffs_is_appleufs(struct vnode *devvp, struct fs *fs)
   1045 {
   1046 	struct dkwedge_info dkw;
   1047 	int ret = 0;
   1048 
   1049 	/*
   1050 	 * First check to see if this is tagged as an Apple UFS filesystem
   1051 	 * in the disklabel.
   1052 	 */
   1053 	if (getdiskinfo(devvp, &dkw) == 0 &&
   1054 	    strcmp(dkw.dkw_ptype, DKW_PTYPE_APPLEUFS) == 0)
   1055 		ret = 1;
   1056 #ifdef APPLE_UFS
   1057 	else {
   1058 		struct appleufslabel *applefs;
   1059 		struct buf *bp;
   1060 		daddr_t blkno = APPLEUFS_LABEL_OFFSET / DEV_BSIZE;
   1061 		int error;
   1062 
   1063 		/*
   1064 		 * Manually look for an Apple UFS label, and if a valid one
   1065 		 * is found, then treat it like an Apple UFS filesystem anyway.
   1066 		 */
   1067 		error = bread(devvp, blkno, APPLEUFS_LABEL_SIZE, 0, &bp);
   1068 		if (error) {
   1069 			DPRINTF("bread@0x%jx returned %d", (intmax_t)blkno, error);
   1070 			return 0;
   1071 		}
   1072 		applefs = (struct appleufslabel *)bp->b_data;
   1073 		error = ffs_appleufs_validate(fs->fs_fsmnt, applefs, NULL);
   1074 		if (error == 0)
   1075 			ret = 1;
   1076 		brelse(bp, 0);
   1077 	}
   1078 #endif
   1079 
   1080 	return ret;
   1081 }
   1082 
   1083 /*
   1084  * Common code for mount and mountroot
   1085  */
   1086 int
   1087 ffs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
   1088 {
   1089 	struct ufsmount *ump = NULL;
   1090 	struct buf *bp = NULL;
   1091 	struct fs *fs = NULL;
   1092 	dev_t dev;
   1093 	void *space;
   1094 	daddr_t sblockloc = 0;
   1095 	int blks, fstype = 0;
   1096 	int error, i, bsize, ronly, bset = 0;
   1097 #ifdef FFS_EI
   1098 	int needswap = 0;		/* keep gcc happy */
   1099 #endif
   1100 	int32_t *lp;
   1101 	kauth_cred_t cred;
   1102 	u_int32_t allocsbsize, fs_sbsize = 0;
   1103 
   1104 	dev = devvp->v_rdev;
   1105 	cred = l ? l->l_cred : NOCRED;
   1106 
   1107 	/* Flush out any old buffers remaining from a previous use. */
   1108 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
   1109 	error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0);
   1110 	VOP_UNLOCK(devvp);
   1111 	if (error) {
   1112 		DPRINTF("vinvalbuf returned %d", error);
   1113 		return error;
   1114 	}
   1115 
   1116 	ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
   1117 
   1118 	ump = kmem_zalloc(sizeof(*ump), KM_SLEEP);
   1119 	mutex_init(&ump->um_lock, MUTEX_DEFAULT, IPL_NONE);
   1120 	error = ffs_snapshot_init(ump);
   1121 	if (error) {
   1122 		DPRINTF("ffs_snapshot_init returned %d", error);
   1123 		goto out;
   1124 	}
   1125 	ump->um_ops = &ffs_ufsops;
   1126 
   1127 #ifdef WAPBL
   1128  sbagain:
   1129 #endif
   1130 	/*
   1131 	 * Try reading the superblock in each of its possible locations.
   1132 	 */
   1133 	for (i = 0; ; i++) {
   1134 		daddr_t fs_sblockloc;
   1135 
   1136 		if (bp != NULL) {
   1137 			brelse(bp, BC_NOCACHE);
   1138 			bp = NULL;
   1139 		}
   1140 		if (sblock_try[i] == -1) {
   1141 			DPRINTF("no superblock found");
   1142 			error = EINVAL;
   1143 			fs = NULL;
   1144 			goto out;
   1145 		}
   1146 
   1147 		error = bread(devvp, sblock_try[i] / DEV_BSIZE, SBLOCKSIZE,
   1148 		    0, &bp);
   1149 		if (error) {
   1150 			DPRINTF("bread@0x%x returned %d",
   1151 			    sblock_try[i] / DEV_BSIZE, error);
   1152 			fs = NULL;
   1153 			goto out;
   1154 		}
   1155 		fs = (struct fs *)bp->b_data;
   1156 
   1157 		sblockloc = sblock_try[i];
   1158 		DPRINTF("fs_magic 0x%x", fs->fs_magic);
   1159 
   1160 		/*
   1161 		 * Swap: here, we swap fs->fs_sbsize in order to get the correct
   1162 		 * size to read the superblock. Once read, we swap the whole
   1163 		 * superblock structure.
   1164 		 */
   1165 		if (fs->fs_magic == FS_UFS1_MAGIC) {
   1166 			fs_sbsize = fs->fs_sbsize;
   1167 			fstype = UFS1;
   1168 #ifdef FFS_EI
   1169 			needswap = 0;
   1170 		} else if (fs->fs_magic == FS_UFS1_MAGIC_SWAPPED) {
   1171 			fs_sbsize = bswap32(fs->fs_sbsize);
   1172 			fstype = UFS1;
   1173 			needswap = 1;
   1174 #endif
   1175 		} else if (fs->fs_magic == FS_UFS2_MAGIC) {
   1176 			fs_sbsize = fs->fs_sbsize;
   1177 			fstype = UFS2;
   1178 #ifdef FFS_EI
   1179 			needswap = 0;
   1180 		} else if (fs->fs_magic == FS_UFS2_MAGIC_SWAPPED) {
   1181 			fs_sbsize = bswap32(fs->fs_sbsize);
   1182 			fstype = UFS2;
   1183 			needswap = 1;
   1184 #endif
   1185 		} else
   1186 			continue;
   1187 
   1188 		/* fs->fs_sblockloc isn't defined for old filesystems */
   1189 		if (fstype == UFS1 && !(fs->fs_old_flags & FS_FLAGS_UPDATED)) {
   1190 			if (sblockloc == SBLOCK_UFS2)
   1191 				/*
   1192 				 * This is likely to be the first alternate
   1193 				 * in a filesystem with 64k blocks.
   1194 				 * Don't use it.
   1195 				 */
   1196 				continue;
   1197 			fs_sblockloc = sblockloc;
   1198 		} else {
   1199 			fs_sblockloc = fs->fs_sblockloc;
   1200 #ifdef FFS_EI
   1201 			if (needswap)
   1202 				fs_sblockloc = bswap64(fs_sblockloc);
   1203 #endif
   1204 		}
   1205 
   1206 		/* Check we haven't found an alternate superblock */
   1207 		if (fs_sblockloc != sblockloc)
   1208 			continue;
   1209 
   1210 		/* Check the superblock size */
   1211 		if (fs_sbsize > SBLOCKSIZE || fs_sbsize < sizeof(struct fs))
   1212 			continue;
   1213 		fs = kmem_alloc((u_long)fs_sbsize, KM_SLEEP);
   1214 		memcpy(fs, bp->b_data, fs_sbsize);
   1215 
   1216 		/* Swap the whole superblock structure, if necessary. */
   1217 #ifdef FFS_EI
   1218 		if (needswap) {
   1219 			ffs_sb_swap((struct fs*)bp->b_data, fs);
   1220 			fs->fs_flags |= FS_SWAPPED;
   1221 		} else
   1222 #endif
   1223 			fs->fs_flags &= ~FS_SWAPPED;
   1224 
   1225 		/*
   1226 		 * Now that everything is swapped, the superblock is ready to
   1227 		 * be sanitized.
   1228 		 */
   1229 		if (!ffs_superblock_validate(fs)) {
   1230 			kmem_free(fs, fs_sbsize);
   1231 			continue;
   1232 		}
   1233 
   1234 		/* Ok seems to be a good superblock */
   1235 		break;
   1236 	}
   1237 
   1238 	ump->um_fs = fs;
   1239 
   1240 #ifdef WAPBL
   1241 	if ((mp->mnt_wapbl_replay == 0) && (fs->fs_flags & FS_DOWAPBL)) {
   1242 		error = ffs_wapbl_replay_start(mp, fs, devvp);
   1243 		if (error && (mp->mnt_flag & MNT_FORCE) == 0) {
   1244 			DPRINTF("ffs_wapbl_replay_start returned %d", error);
   1245 			goto out;
   1246 		}
   1247 		if (!error) {
   1248 			if (!ronly) {
   1249 				/* XXX fsmnt may be stale. */
   1250 				printf("%s: replaying log to disk\n",
   1251 				    fs->fs_fsmnt);
   1252 				error = wapbl_replay_write(mp->mnt_wapbl_replay,
   1253 				    devvp);
   1254 				if (error) {
   1255 					DPRINTF("wapbl_replay_write returned %d",
   1256 					    error);
   1257 					goto out;
   1258 				}
   1259 				wapbl_replay_stop(mp->mnt_wapbl_replay);
   1260 				fs->fs_clean = FS_WASCLEAN;
   1261 			} else {
   1262 				/* XXX fsmnt may be stale */
   1263 				printf("%s: replaying log to memory\n",
   1264 				    fs->fs_fsmnt);
   1265 			}
   1266 
   1267 			/* Force a re-read of the superblock */
   1268 			brelse(bp, BC_INVAL);
   1269 			bp = NULL;
   1270 			kmem_free(fs, fs_sbsize);
   1271 			fs = NULL;
   1272 			goto sbagain;
   1273 		}
   1274 	}
   1275 #else /* !WAPBL */
   1276 	if ((fs->fs_flags & FS_DOWAPBL) && (mp->mnt_flag & MNT_FORCE) == 0) {
   1277 		error = EPERM;
   1278 		DPRINTF("no force %d", error);
   1279 		goto out;
   1280 	}
   1281 #endif /* !WAPBL */
   1282 
   1283 	ffs_oldfscompat_read(fs, ump, sblockloc);
   1284 	ump->um_maxfilesize = fs->fs_maxfilesize;
   1285 
   1286 	if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
   1287 		uprintf("%s: unknown ufs flags: 0x%08"PRIx32"%s\n",
   1288 		    mp->mnt_stat.f_mntonname, fs->fs_flags,
   1289 		    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
   1290 		if ((mp->mnt_flag & MNT_FORCE) == 0) {
   1291 			error = EINVAL;
   1292 			DPRINTF("no force %d", error);
   1293 			goto out;
   1294 		}
   1295 	}
   1296 
   1297 	if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
   1298 		fs->fs_pendingblocks = 0;
   1299 		fs->fs_pendinginodes = 0;
   1300 	}
   1301 
   1302 	ump->um_fstype = fstype;
   1303 	if (fs->fs_sbsize < SBLOCKSIZE)
   1304 		brelse(bp, BC_INVAL);
   1305 	else
   1306 		brelse(bp, 0);
   1307 	bp = NULL;
   1308 
   1309 	if (ffs_is_appleufs(devvp, fs)) {
   1310 #ifdef APPLE_UFS
   1311 		ump->um_flags |= UFS_ISAPPLEUFS;
   1312 #else
   1313 		DPRINTF("AppleUFS not supported");
   1314 		error = EINVAL;
   1315 		goto out;
   1316 #endif
   1317 	}
   1318 
   1319 #if 0
   1320 /*
   1321  * XXX This code changes the behaviour of mounting dirty filesystems, to
   1322  * XXX require "mount -f ..." to mount them.  This doesn't match what
   1323  * XXX mount(8) describes and is disabled for now.
   1324  */
   1325 	/*
   1326 	 * If the file system is not clean, don't allow it to be mounted
   1327 	 * unless MNT_FORCE is specified.  (Note: MNT_FORCE is always set
   1328 	 * for the root file system.)
   1329 	 */
   1330 	if (fs->fs_flags & FS_DOWAPBL) {
   1331 		/*
   1332 		 * wapbl normally expects to be FS_WASCLEAN when the FS_DOWAPBL
   1333 		 * bit is set, although there's a window in unmount where it
   1334 		 * could be FS_ISCLEAN
   1335 		 */
   1336 		if ((mp->mnt_flag & MNT_FORCE) == 0 &&
   1337 		    (fs->fs_clean & (FS_WASCLEAN | FS_ISCLEAN)) == 0) {
   1338 			error = EPERM;
   1339 			goto out;
   1340 		}
   1341 	} else
   1342 		if ((fs->fs_clean & FS_ISCLEAN) == 0 &&
   1343 		    (mp->mnt_flag & MNT_FORCE) == 0) {
   1344 			error = EPERM;
   1345 			goto out;
   1346 		}
   1347 #endif
   1348 
   1349 	/*
   1350 	 * Verify that we can access the last block in the fs
   1351 	 * if we're mounting read/write.
   1352 	 */
   1353 	if (!ronly) {
   1354 		error = bread(devvp, FFS_FSBTODB(fs, fs->fs_size - 1),
   1355 		    fs->fs_fsize, 0, &bp);
   1356 		if (error) {
   1357 			DPRINTF("bread@0x%jx returned %d",
   1358 			    (intmax_t)FFS_FSBTODB(fs, fs->fs_size - 1),
   1359 			    error);
   1360 			bset = BC_INVAL;
   1361 			goto out;
   1362 		}
   1363 		if (bp->b_bcount != fs->fs_fsize) {
   1364 			DPRINTF("bcount %x != fsize %x", bp->b_bcount,
   1365 			    fs->fs_fsize);
   1366 			error = EINVAL;
   1367 			bset = BC_INVAL;
   1368 			goto out;
   1369 		}
   1370 		brelse(bp, BC_INVAL);
   1371 		bp = NULL;
   1372 	}
   1373 
   1374 	fs->fs_ronly = ronly;
   1375 	/* Don't bump fs_clean if we're replaying journal */
   1376 	if (!((fs->fs_flags & FS_DOWAPBL) && (fs->fs_clean & FS_WASCLEAN))) {
   1377 		if (ronly == 0) {
   1378 			fs->fs_clean <<= 1;
   1379 			fs->fs_fmod = 1;
   1380 		}
   1381 	}
   1382 
   1383 	bsize = fs->fs_cssize;
   1384 	blks = howmany(bsize, fs->fs_fsize);
   1385 	if (fs->fs_contigsumsize > 0)
   1386 		bsize += fs->fs_ncg * sizeof(int32_t);
   1387 	bsize += fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1388 	allocsbsize = bsize;
   1389 	space = kmem_alloc((u_long)allocsbsize, KM_SLEEP);
   1390 	fs->fs_csp = space;
   1391 
   1392 	for (i = 0; i < blks; i += fs->fs_frag) {
   1393 		bsize = fs->fs_bsize;
   1394 		if (i + fs->fs_frag > blks)
   1395 			bsize = (blks - i) * fs->fs_fsize;
   1396 		error = bread(devvp, FFS_FSBTODB(fs, fs->fs_csaddr + i), bsize,
   1397 			      0, &bp);
   1398 		if (error) {
   1399 			DPRINTF("bread@0x%jx %d",
   1400 			    (intmax_t)FFS_FSBTODB(fs, fs->fs_csaddr + i),
   1401 			    error);
   1402 			goto out1;
   1403 		}
   1404 #ifdef FFS_EI
   1405 		if (needswap)
   1406 			ffs_csum_swap((struct csum *)bp->b_data,
   1407 				(struct csum *)space, bsize);
   1408 		else
   1409 #endif
   1410 			memcpy(space, bp->b_data, (u_int)bsize);
   1411 
   1412 		space = (char *)space + bsize;
   1413 		brelse(bp, 0);
   1414 		bp = NULL;
   1415 	}
   1416 	if (fs->fs_contigsumsize > 0) {
   1417 		fs->fs_maxcluster = lp = space;
   1418 		for (i = 0; i < fs->fs_ncg; i++)
   1419 			*lp++ = fs->fs_contigsumsize;
   1420 		space = lp;
   1421 	}
   1422 	bsize = fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1423 	fs->fs_contigdirs = space;
   1424 	space = (char *)space + bsize;
   1425 	memset(fs->fs_contigdirs, 0, bsize);
   1426 
   1427 	/* Compatibility for old filesystems - XXX */
   1428 	if (fs->fs_avgfilesize <= 0)
   1429 		fs->fs_avgfilesize = AVFILESIZ;
   1430 	if (fs->fs_avgfpdir <= 0)
   1431 		fs->fs_avgfpdir = AFPDIR;
   1432 	fs->fs_active = NULL;
   1433 
   1434 	mp->mnt_data = ump;
   1435 	mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
   1436 	mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FFS);
   1437 	mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
   1438 	mp->mnt_stat.f_namemax = FFS_MAXNAMLEN;
   1439 	if (UFS_MPISAPPLEUFS(ump)) {
   1440 		/* NeXT used to keep short symlinks in the inode even
   1441 		 * when using FS_42INODEFMT.  In that case fs->fs_maxsymlinklen
   1442 		 * is probably -1, but we still need to be able to identify
   1443 		 * short symlinks.
   1444 		 */
   1445 		ump->um_maxsymlinklen = APPLEUFS_MAXSYMLINKLEN;
   1446 		ump->um_dirblksiz = APPLEUFS_DIRBLKSIZ;
   1447 		mp->mnt_iflag |= IMNT_DTYPE;
   1448 	} else {
   1449 		ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
   1450 		ump->um_dirblksiz = UFS_DIRBLKSIZ;
   1451 		if (ump->um_maxsymlinklen > 0)
   1452 			mp->mnt_iflag |= IMNT_DTYPE;
   1453 		else
   1454 			mp->mnt_iflag &= ~IMNT_DTYPE;
   1455 	}
   1456 	mp->mnt_fs_bshift = fs->fs_bshift;
   1457 	mp->mnt_dev_bshift = DEV_BSHIFT;	/* XXX */
   1458 	mp->mnt_flag |= MNT_LOCAL;
   1459 	mp->mnt_iflag |= IMNT_MPSAFE | IMNT_CAN_RWTORO;
   1460 #ifdef FFS_EI
   1461 	if (needswap)
   1462 		ump->um_flags |= UFS_NEEDSWAP;
   1463 #endif
   1464 	ump->um_mountp = mp;
   1465 	ump->um_dev = dev;
   1466 	ump->um_devvp = devvp;
   1467 	ump->um_nindir = fs->fs_nindir;
   1468 	ump->um_lognindir = ffs(fs->fs_nindir) - 1;
   1469 	ump->um_bptrtodb = fs->fs_fshift - DEV_BSHIFT;
   1470 	ump->um_seqinc = fs->fs_frag;
   1471 	for (i = 0; i < MAXQUOTAS; i++)
   1472 		ump->um_quotas[i] = NULLVP;
   1473 	spec_node_setmountedfs(devvp, mp);
   1474 	if (ronly == 0 && fs->fs_snapinum[0] != 0)
   1475 		ffs_snapshot_mount(mp);
   1476 #ifdef WAPBL
   1477 	if (!ronly) {
   1478 		KDASSERT(fs->fs_ronly == 0);
   1479 		/*
   1480 		 * ffs_wapbl_start() needs mp->mnt_stat initialised if it
   1481 		 * needs to create a new log file in-filesystem.
   1482 		 */
   1483 		error = ffs_statvfs(mp, &mp->mnt_stat);
   1484 		if (error) {
   1485 			DPRINTF("ffs_statvfs returned %d", error);
   1486 			goto out1;
   1487 		}
   1488 
   1489 		error = ffs_wapbl_start(mp);
   1490 		if (error) {
   1491 			DPRINTF("ffs_wapbl_start returned %d", error);
   1492 			goto out1;
   1493 		}
   1494 	}
   1495 #endif /* WAPBL */
   1496 	if (ronly == 0) {
   1497 #ifdef QUOTA2
   1498 		error = ffs_quota2_mount(mp);
   1499 		if (error) {
   1500 			DPRINTF("ffs_quota2_mount returned %d", error);
   1501 			goto out1;
   1502 		}
   1503 #else
   1504 		if (fs->fs_flags & FS_DOQUOTA2) {
   1505 			ump->um_flags |= UFS_QUOTA2;
   1506 			uprintf("%s: options QUOTA2 not enabled%s\n",
   1507 			    mp->mnt_stat.f_mntonname,
   1508 			    (mp->mnt_flag & MNT_FORCE) ? "" : ", not mounting");
   1509 			if ((mp->mnt_flag & MNT_FORCE) == 0) {
   1510 				error = EINVAL;
   1511 				DPRINTF("quota disabled %d", error);
   1512 				goto out1;
   1513 			}
   1514 		}
   1515 #endif
   1516 	 }
   1517 
   1518 	if (mp->mnt_flag & MNT_DISCARD)
   1519 		ump->um_discarddata = ffs_discard_init(devvp, fs);
   1520 
   1521 	return (0);
   1522 out1:
   1523 	kmem_free(fs->fs_csp, allocsbsize);
   1524 out:
   1525 #ifdef WAPBL
   1526 	if (mp->mnt_wapbl_replay) {
   1527 		wapbl_replay_stop(mp->mnt_wapbl_replay);
   1528 		wapbl_replay_free(mp->mnt_wapbl_replay);
   1529 		mp->mnt_wapbl_replay = 0;
   1530 	}
   1531 #endif
   1532 
   1533 	if (fs)
   1534 		kmem_free(fs, fs->fs_sbsize);
   1535 	spec_node_setmountedfs(devvp, NULL);
   1536 	if (bp)
   1537 		brelse(bp, bset);
   1538 	if (ump) {
   1539 		if (ump->um_oldfscompat)
   1540 			kmem_free(ump->um_oldfscompat, 512 + 3*sizeof(int32_t));
   1541 		mutex_destroy(&ump->um_lock);
   1542 		kmem_free(ump, sizeof(*ump));
   1543 		mp->mnt_data = NULL;
   1544 	}
   1545 	return (error);
   1546 }
   1547 
   1548 /*
   1549  * Sanity checks for loading old filesystem superblocks.
   1550  * See ffs_oldfscompat_write below for unwound actions.
   1551  *
   1552  * XXX - Parts get retired eventually.
   1553  * Unfortunately new bits get added.
   1554  */
   1555 static void
   1556 ffs_oldfscompat_read(struct fs *fs, struct ufsmount *ump, daddr_t sblockloc)
   1557 {
   1558 	off_t maxfilesize;
   1559 	int32_t *extrasave;
   1560 
   1561 	if ((fs->fs_magic != FS_UFS1_MAGIC) ||
   1562 	    (fs->fs_old_flags & FS_FLAGS_UPDATED))
   1563 		return;
   1564 
   1565 	if (!ump->um_oldfscompat)
   1566 		ump->um_oldfscompat = kmem_alloc(512 + 3*sizeof(int32_t),
   1567 		    KM_SLEEP);
   1568 
   1569 	memcpy(ump->um_oldfscompat, &fs->fs_old_postbl_start, 512);
   1570 	extrasave = ump->um_oldfscompat;
   1571 	extrasave += 512/sizeof(int32_t);
   1572 	extrasave[0] = fs->fs_old_npsect;
   1573 	extrasave[1] = fs->fs_old_interleave;
   1574 	extrasave[2] = fs->fs_old_trackskew;
   1575 
   1576 	/* These fields will be overwritten by their
   1577 	 * original values in fs_oldfscompat_write, so it is harmless
   1578 	 * to modify them here.
   1579 	 */
   1580 	fs->fs_cstotal.cs_ndir = fs->fs_old_cstotal.cs_ndir;
   1581 	fs->fs_cstotal.cs_nbfree = fs->fs_old_cstotal.cs_nbfree;
   1582 	fs->fs_cstotal.cs_nifree = fs->fs_old_cstotal.cs_nifree;
   1583 	fs->fs_cstotal.cs_nffree = fs->fs_old_cstotal.cs_nffree;
   1584 
   1585 	fs->fs_maxbsize = fs->fs_bsize;
   1586 	fs->fs_time = fs->fs_old_time;
   1587 	fs->fs_size = fs->fs_old_size;
   1588 	fs->fs_dsize = fs->fs_old_dsize;
   1589 	fs->fs_csaddr = fs->fs_old_csaddr;
   1590 	fs->fs_sblockloc = sblockloc;
   1591 
   1592 	fs->fs_flags = fs->fs_old_flags | (fs->fs_flags & FS_INTERNAL);
   1593 
   1594 	if (fs->fs_old_postblformat == FS_42POSTBLFMT) {
   1595 		fs->fs_old_nrpos = 8;
   1596 		fs->fs_old_npsect = fs->fs_old_nsect;
   1597 		fs->fs_old_interleave = 1;
   1598 		fs->fs_old_trackskew = 0;
   1599 	}
   1600 
   1601 	if (fs->fs_magic == FS_UFS1_MAGIC &&
   1602 	    fs->fs_old_inodefmt < FS_44INODEFMT) {
   1603 		fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
   1604 		fs->fs_qbmask = ~fs->fs_bmask;
   1605 		fs->fs_qfmask = ~fs->fs_fmask;
   1606 	}
   1607 
   1608 	maxfilesize = (u_int64_t)0x80000000 * fs->fs_bsize - 1;
   1609 	if (fs->fs_maxfilesize > maxfilesize)
   1610 		fs->fs_maxfilesize = maxfilesize;
   1611 
   1612 	/* Compatibility for old filesystems */
   1613 	if (fs->fs_avgfilesize <= 0)
   1614 		fs->fs_avgfilesize = AVFILESIZ;
   1615 	if (fs->fs_avgfpdir <= 0)
   1616 		fs->fs_avgfpdir = AFPDIR;
   1617 
   1618 #if 0
   1619 	if (bigcgs) {
   1620 		fs->fs_save_cgsize = fs->fs_cgsize;
   1621 		fs->fs_cgsize = fs->fs_bsize;
   1622 	}
   1623 #endif
   1624 }
   1625 
   1626 /*
   1627  * Unwinding superblock updates for old filesystems.
   1628  * See ffs_oldfscompat_read above for details.
   1629  *
   1630  * XXX - Parts get retired eventually.
   1631  * Unfortunately new bits get added.
   1632  */
   1633 static void
   1634 ffs_oldfscompat_write(struct fs *fs, struct ufsmount *ump)
   1635 {
   1636 	int32_t *extrasave;
   1637 
   1638 	if ((fs->fs_magic != FS_UFS1_MAGIC) ||
   1639 	    (fs->fs_old_flags & FS_FLAGS_UPDATED))
   1640 		return;
   1641 
   1642 	fs->fs_old_time = fs->fs_time;
   1643 	fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir;
   1644 	fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree;
   1645 	fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree;
   1646 	fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree;
   1647 	fs->fs_old_flags = fs->fs_flags;
   1648 
   1649 #if 0
   1650 	if (bigcgs) {
   1651 		fs->fs_cgsize = fs->fs_save_cgsize;
   1652 	}
   1653 #endif
   1654 
   1655 	memcpy(&fs->fs_old_postbl_start, ump->um_oldfscompat, 512);
   1656 	extrasave = ump->um_oldfscompat;
   1657 	extrasave += 512/sizeof(int32_t);
   1658 	fs->fs_old_npsect = extrasave[0];
   1659 	fs->fs_old_interleave = extrasave[1];
   1660 	fs->fs_old_trackskew = extrasave[2];
   1661 
   1662 }
   1663 
   1664 /*
   1665  * unmount vfs operation
   1666  */
   1667 int
   1668 ffs_unmount(struct mount *mp, int mntflags)
   1669 {
   1670 	struct lwp *l = curlwp;
   1671 	struct ufsmount *ump = VFSTOUFS(mp);
   1672 	struct fs *fs = ump->um_fs;
   1673 	int error, flags;
   1674 	u_int32_t bsize;
   1675 #ifdef WAPBL
   1676 	extern int doforce;
   1677 #endif
   1678 
   1679 	/* The file system is suspended. */
   1680 	KASSERT(fstrans_is_owner(mp));
   1681 
   1682 	if (ump->um_discarddata) {
   1683 		ffs_discard_finish(ump->um_discarddata, mntflags);
   1684 		ump->um_discarddata = NULL;
   1685 	}
   1686 
   1687 	flags = 0;
   1688 	if (mntflags & MNT_FORCE)
   1689 		flags |= FORCECLOSE;
   1690 	if ((error = ffs_flushfiles(mp, flags, l)) != 0)
   1691 		return (error);
   1692 	if (fs->fs_ronly == 0 && UFS_WAPBL_BEGIN(mp) == 0) {
   1693 		if (ffs_cgupdate(ump, MNT_WAIT) == 0 &&
   1694 		    fs->fs_clean & FS_WASCLEAN) {
   1695 			mutex_enter(&ump->um_lock);
   1696 			fs->fs_clean = FS_ISCLEAN;
   1697 			fs->fs_fmod = 0;
   1698 			mutex_exit(&ump->um_lock);
   1699 			(void) ffs_sbupdate(ump, MNT_WAIT);
   1700 		}
   1701 		UFS_WAPBL_END(mp);
   1702 	}
   1703 #ifdef WAPBL
   1704 	KASSERT(!(mp->mnt_wapbl_replay && mp->mnt_wapbl));
   1705 	if (mp->mnt_wapbl_replay) {
   1706 		KDASSERT(fs->fs_ronly);
   1707 		wapbl_replay_stop(mp->mnt_wapbl_replay);
   1708 		wapbl_replay_free(mp->mnt_wapbl_replay);
   1709 		mp->mnt_wapbl_replay = 0;
   1710 	}
   1711 	error = ffs_wapbl_stop(mp, doforce && (mntflags & MNT_FORCE));
   1712 	if (error) {
   1713 		return error;
   1714 	}
   1715 #endif /* WAPBL */
   1716 
   1717 	if (ump->um_devvp->v_type != VBAD)
   1718 		spec_node_setmountedfs(ump->um_devvp, NULL);
   1719 	vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1720 	(void)VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD | FWRITE,
   1721 		NOCRED);
   1722 	vput(ump->um_devvp);
   1723 
   1724 	bsize = fs->fs_cssize;
   1725 	if (fs->fs_contigsumsize > 0)
   1726 		bsize += fs->fs_ncg * sizeof(int32_t);
   1727 	bsize += fs->fs_ncg * sizeof(*fs->fs_contigdirs);
   1728 	kmem_free(fs->fs_csp, bsize);
   1729 
   1730 	kmem_free(fs, fs->fs_sbsize);
   1731 	if (ump->um_oldfscompat != NULL)
   1732 		kmem_free(ump->um_oldfscompat, 512 + 3*sizeof(int32_t));
   1733 	mutex_destroy(&ump->um_lock);
   1734 	ffs_snapshot_fini(ump);
   1735 	kmem_free(ump, sizeof(*ump));
   1736 	mp->mnt_data = NULL;
   1737 	mp->mnt_flag &= ~MNT_LOCAL;
   1738 	return (0);
   1739 }
   1740 
   1741 /*
   1742  * Flush out all the files in a filesystem.
   1743  */
   1744 int
   1745 ffs_flushfiles(struct mount *mp, int flags, struct lwp *l)
   1746 {
   1747 	extern int doforce;
   1748 	struct ufsmount *ump;
   1749 	int error;
   1750 
   1751 	if (!doforce)
   1752 		flags &= ~FORCECLOSE;
   1753 	ump = VFSTOUFS(mp);
   1754 #ifdef QUOTA
   1755 	if ((error = quota1_umount(mp, flags)) != 0)
   1756 		return (error);
   1757 #endif
   1758 #ifdef QUOTA2
   1759 	if ((error = quota2_umount(mp, flags)) != 0)
   1760 		return (error);
   1761 #endif
   1762 #ifdef UFS_EXTATTR
   1763 	if (ump->um_fstype == UFS1) {
   1764 		if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)
   1765 			ufs_extattr_stop(mp, l);
   1766 		if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED)
   1767 			ufs_extattr_uepm_destroy(&ump->um_extattr);
   1768 		mp->mnt_flag &= ~MNT_EXTATTR;
   1769 	}
   1770 #endif
   1771 	if ((error = vflush(mp, 0, SKIPSYSTEM | flags)) != 0)
   1772 		return (error);
   1773 	ffs_snapshot_unmount(mp);
   1774 	/*
   1775 	 * Flush all the files.
   1776 	 */
   1777 	error = vflush(mp, NULLVP, flags);
   1778 	if (error)
   1779 		return (error);
   1780 	/*
   1781 	 * Flush filesystem metadata.
   1782 	 */
   1783 	vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1784 	error = VOP_FSYNC(ump->um_devvp, l->l_cred, FSYNC_WAIT, 0, 0);
   1785 	VOP_UNLOCK(ump->um_devvp);
   1786 	if (flags & FORCECLOSE) /* XXXDBJ */
   1787 		error = 0;
   1788 
   1789 #ifdef WAPBL
   1790 	if (error)
   1791 		return error;
   1792 	if (mp->mnt_wapbl) {
   1793 		error = wapbl_flush(mp->mnt_wapbl, 1);
   1794 		if (flags & FORCECLOSE)
   1795 			error = 0;
   1796 	}
   1797 #endif
   1798 
   1799 	return (error);
   1800 }
   1801 
   1802 /*
   1803  * Get file system statistics.
   1804  */
   1805 int
   1806 ffs_statvfs(struct mount *mp, struct statvfs *sbp)
   1807 {
   1808 	struct ufsmount *ump;
   1809 	struct fs *fs;
   1810 
   1811 	ump = VFSTOUFS(mp);
   1812 	fs = ump->um_fs;
   1813 	mutex_enter(&ump->um_lock);
   1814 	sbp->f_bsize = fs->fs_bsize;
   1815 	sbp->f_frsize = fs->fs_fsize;
   1816 	sbp->f_iosize = fs->fs_bsize;
   1817 	sbp->f_blocks = fs->fs_dsize;
   1818 	sbp->f_bfree = ffs_blkstofrags(fs, fs->fs_cstotal.cs_nbfree) +
   1819 	    fs->fs_cstotal.cs_nffree + FFS_DBTOFSB(fs, fs->fs_pendingblocks);
   1820 	sbp->f_bresvd = ((u_int64_t) fs->fs_dsize * (u_int64_t)
   1821 	    fs->fs_minfree) / (u_int64_t) 100;
   1822 	if (sbp->f_bfree > sbp->f_bresvd)
   1823 		sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd;
   1824 	else
   1825 		sbp->f_bavail = 0;
   1826 	sbp->f_files =  fs->fs_ncg * fs->fs_ipg - UFS_ROOTINO;
   1827 	sbp->f_ffree = fs->fs_cstotal.cs_nifree + fs->fs_pendinginodes;
   1828 	sbp->f_favail = sbp->f_ffree;
   1829 	sbp->f_fresvd = 0;
   1830 	mutex_exit(&ump->um_lock);
   1831 	copy_statvfs_info(sbp, mp);
   1832 
   1833 	return (0);
   1834 }
   1835 
   1836 struct ffs_sync_ctx {
   1837 	int waitfor;
   1838 };
   1839 
   1840 static bool
   1841 ffs_sync_selector(void *cl, struct vnode *vp)
   1842 {
   1843 	struct ffs_sync_ctx *c = cl;
   1844 	struct inode *ip;
   1845 
   1846 	KASSERT(mutex_owned(vp->v_interlock));
   1847 
   1848 	ip = VTOI(vp);
   1849 	/*
   1850 	 * Skip the vnode/inode if inaccessible.
   1851 	 */
   1852 	if (ip == NULL || vp->v_type == VNON)
   1853 		return false;
   1854 
   1855 	/*
   1856 	 * We deliberately update inode times here.  This will
   1857 	 * prevent a massive queue of updates accumulating, only
   1858 	 * to be handled by a call to unmount.
   1859 	 *
   1860 	 * XXX It would be better to have the syncer trickle these
   1861 	 * out.  Adjustment needed to allow registering vnodes for
   1862 	 * sync when the vnode is clean, but the inode dirty.  Or
   1863 	 * have ufs itself trickle out inode updates.
   1864 	 *
   1865 	 * If doing a lazy sync, we don't care about metadata or
   1866 	 * data updates, because they are handled by each vnode's
   1867 	 * synclist entry.  In this case we are only interested in
   1868 	 * writing back modified inodes.
   1869 	 */
   1870 	if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE |
   1871 	    IN_MODIFY | IN_MODIFIED | IN_ACCESSED)) == 0 &&
   1872 	    (c->waitfor == MNT_LAZY || (LIST_EMPTY(&vp->v_dirtyblkhd) &&
   1873 	    UVM_OBJ_IS_CLEAN(&vp->v_uobj))))
   1874 		return false;
   1875 
   1876 	return true;
   1877 }
   1878 
   1879 /*
   1880  * Go through the disk queues to initiate sandbagged IO;
   1881  * go through the inodes to write those that have been modified;
   1882  * initiate the writing of the super block if it has been modified.
   1883  */
   1884 int
   1885 ffs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
   1886 {
   1887 	struct vnode *vp;
   1888 	struct ufsmount *ump = VFSTOUFS(mp);
   1889 	struct fs *fs;
   1890 	struct vnode_iterator *marker;
   1891 	int error, allerror = 0;
   1892 	struct ffs_sync_ctx ctx;
   1893 
   1894 	fs = ump->um_fs;
   1895 	if (fs->fs_fmod != 0 && fs->fs_ronly != 0) {		/* XXX */
   1896 		panic("%s: rofs mod, fs=%s", __func__, fs->fs_fsmnt);
   1897 	}
   1898 
   1899 	/*
   1900 	 * Write back each (modified) inode.
   1901 	 */
   1902 	vfs_vnode_iterator_init(mp, &marker);
   1903 
   1904 	ctx.waitfor = waitfor;
   1905 	while ((vp = vfs_vnode_iterator_next(marker, ffs_sync_selector, &ctx)))
   1906 	{
   1907 		error = vn_lock(vp,
   1908 		    LK_EXCLUSIVE | (waitfor == MNT_LAZY ? LK_NOWAIT : 0));
   1909 		if (error) {
   1910 			vrele(vp);
   1911 			continue;
   1912 		}
   1913 		if (waitfor == MNT_LAZY) {
   1914 			error = UFS_WAPBL_BEGIN(vp->v_mount);
   1915 			if (!error) {
   1916 				error = ffs_update(vp, NULL, NULL,
   1917 				    UPDATE_CLOSE);
   1918 				UFS_WAPBL_END(vp->v_mount);
   1919 			}
   1920 		} else {
   1921 			error = VOP_FSYNC(vp, cred, FSYNC_NOLOG |
   1922 			    (waitfor == MNT_WAIT ? FSYNC_WAIT : 0), 0, 0);
   1923 		}
   1924 		if (error)
   1925 			allerror = error;
   1926 		vput(vp);
   1927 	}
   1928 	vfs_vnode_iterator_destroy(marker);
   1929 
   1930 	/*
   1931 	 * Force stale file system control information to be flushed.
   1932 	 */
   1933 	if (waitfor != MNT_LAZY)  {
   1934 		bool need_devvp_fsync;
   1935 
   1936 		mutex_enter(ump->um_devvp->v_interlock);
   1937 		need_devvp_fsync = (ump->um_devvp->v_numoutput > 0 ||
   1938 		    !LIST_EMPTY(&ump->um_devvp->v_dirtyblkhd));
   1939 		mutex_exit(ump->um_devvp->v_interlock);
   1940 		if (need_devvp_fsync) {
   1941 			int flags = FSYNC_NOLOG;
   1942 
   1943 			if (waitfor == MNT_WAIT)
   1944 				flags |= FSYNC_WAIT;
   1945 
   1946 			vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
   1947 			if ((error = VOP_FSYNC(ump->um_devvp, cred, flags, 0,
   1948 				    0)) != 0)
   1949 				allerror = error;
   1950 			VOP_UNLOCK(ump->um_devvp);
   1951 		}
   1952 	}
   1953 #if defined(QUOTA) || defined(QUOTA2)
   1954 	qsync(mp);
   1955 #endif
   1956 	/*
   1957 	 * Write back modified superblock.
   1958 	 */
   1959 	error = UFS_WAPBL_BEGIN(mp);
   1960 	if (error) {
   1961 		allerror = error;
   1962 	} else {
   1963 		mutex_enter(&ump->um_lock);
   1964 		if (fs->fs_fmod != 0) {
   1965 			fs->fs_fmod = 0;
   1966 			fs->fs_time = time_second;
   1967 			mutex_exit(&ump->um_lock);
   1968 			if ((error = ffs_cgupdate(ump, waitfor)))
   1969 				allerror = error;
   1970 		} else {
   1971 			mutex_exit(&ump->um_lock);
   1972 		}
   1973 		UFS_WAPBL_END(mp);
   1974 	}
   1975 
   1976 #ifdef WAPBL
   1977 	if (mp->mnt_wapbl) {
   1978 		error = wapbl_flush(mp->mnt_wapbl, (waitfor == MNT_WAIT));
   1979 		if (error)
   1980 			allerror = error;
   1981 	}
   1982 #endif
   1983 
   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 	genfs_node_destroy(vp);
   2047 	vp->v_data = NULL;
   2048 
   2049 	if (ump->um_fstype == UFS1)
   2050 		pool_cache_put(ffs_dinode1_cache, ip->i_din.ffs1_din);
   2051 	else
   2052 		pool_cache_put(ffs_dinode2_cache, ip->i_din.ffs2_din);
   2053 	pool_cache_put(ffs_inode_cache, ip);
   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_magic == FS_UFS1_MAGIC &&			/* XXX */
   2099 	    fs->fs_old_inodefmt < FS_44INODEFMT) {		/* XXX */
   2100 		ip->i_uid = ip->i_ffs1_ouid;			/* XXX */
   2101 		ip->i_gid = ip->i_ffs1_ogid;			/* XXX */
   2102 	}							/* XXX */
   2103 	uvm_vnp_setsize(vp, ip->i_size);
   2104 	*new_key = &ip->i_number;
   2105 	return 0;
   2106 }
   2107 
   2108 /*
   2109  * Create a new inode on disk and initialize this vnode / inode pair.
   2110  */
   2111 int
   2112 ffs_newvnode(struct mount *mp, struct vnode *dvp, struct vnode *vp,
   2113     struct vattr *vap, kauth_cred_t cred, void *extra,
   2114     size_t *key_len, const void **new_key)
   2115 {
   2116 	ino_t ino;
   2117 	struct fs *fs;
   2118 	struct inode *ip;
   2119 	struct timespec ts;
   2120 	struct ufsmount *ump;
   2121 	int error, mode;
   2122 
   2123 	KASSERT(dvp->v_mount == mp);
   2124 	KASSERT(vap->va_type != VNON);
   2125 
   2126 	*key_len = sizeof(ino);
   2127 	ump = VFSTOUFS(mp);
   2128 	fs = ump->um_fs;
   2129 	mode = MAKEIMODE(vap->va_type, vap->va_mode);
   2130 
   2131 	/* Allocate fresh inode. */
   2132 	error = ffs_valloc(dvp, mode, cred, &ino);
   2133 	if (error)
   2134 		return error;
   2135 
   2136 	/* Attach inode to vnode. */
   2137 	error = ffs_init_vnode(ump, vp, ino);
   2138 	if (error) {
   2139 		if (UFS_WAPBL_BEGIN(mp) == 0) {
   2140 			ffs_vfree(dvp, ino, mode);
   2141 			UFS_WAPBL_END(mp);
   2142 		}
   2143 		return error;
   2144 	}
   2145 
   2146 	ip = VTOI(vp);
   2147 	if (ip->i_mode) {
   2148 		panic("%s: dup alloc ino=%" PRId64 " on %s: mode %o/%o "
   2149 		    "gen %x/%x size %" PRIx64 " blocks %" PRIx64,
   2150 		    __func__, ino, fs->fs_fsmnt, DIP(ip, mode), ip->i_mode,
   2151 		    DIP(ip, gen), ip->i_gen, DIP(ip, size), DIP(ip, blocks));
   2152 	}
   2153 	if (DIP(ip, size) || DIP(ip, blocks)) {
   2154 		printf("%s: ino=%" PRId64 " on %s: "
   2155 		    "gen %x/%x has non zero blocks %" PRIx64 " or size %"
   2156 		    PRIx64 "\n",
   2157 		    __func__, ino, fs->fs_fsmnt, DIP(ip, gen), ip->i_gen,
   2158 		    DIP(ip, blocks), DIP(ip, size));
   2159 		if ((ip)->i_ump->um_fstype == UFS1)
   2160 			panic("%s: dirty filesystem?", __func__);
   2161 		DIP_ASSIGN(ip, blocks, 0);
   2162 		DIP_ASSIGN(ip, size, 0);
   2163 	}
   2164 
   2165 	/* Set uid / gid. */
   2166 	if (cred == NOCRED || cred == FSCRED) {
   2167 		ip->i_gid = 0;
   2168 		ip->i_uid = 0;
   2169 	} else {
   2170 		ip->i_gid = VTOI(dvp)->i_gid;
   2171 		ip->i_uid = kauth_cred_geteuid(cred);
   2172 	}
   2173 	DIP_ASSIGN(ip, gid, ip->i_gid);
   2174 	DIP_ASSIGN(ip, uid, ip->i_uid);
   2175 
   2176 #if defined(QUOTA) || defined(QUOTA2)
   2177 	error = UFS_WAPBL_BEGIN(mp);
   2178 	if (error) {
   2179 		ffs_deinit_vnode(ump, vp);
   2180 
   2181 		return error;
   2182 	}
   2183 	error = chkiq(ip, 1, cred, 0);
   2184 	if (error) {
   2185 		ffs_vfree(dvp, ino, mode);
   2186 		UFS_WAPBL_END(mp);
   2187 		ffs_deinit_vnode(ump, vp);
   2188 
   2189 		return error;
   2190 	}
   2191 	UFS_WAPBL_END(mp);
   2192 #endif
   2193 
   2194 	/* Set type and finalize. */
   2195 	ip->i_flags = 0;
   2196 	DIP_ASSIGN(ip, flags, 0);
   2197 	ip->i_mode = mode;
   2198 	DIP_ASSIGN(ip, mode, mode);
   2199 	if (vap->va_rdev != VNOVAL) {
   2200 		/*
   2201 		 * Want to be able to use this to make badblock
   2202 		 * inodes, so don't truncate the dev number.
   2203 		 */
   2204 		if (ump->um_fstype == UFS1)
   2205 			ip->i_ffs1_rdev = ufs_rw32(vap->va_rdev,
   2206 			    UFS_MPNEEDSWAP(ump));
   2207 		else
   2208 			ip->i_ffs2_rdev = ufs_rw64(vap->va_rdev,
   2209 			    UFS_MPNEEDSWAP(ump));
   2210 	}
   2211 	ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
   2212 	ip->i_devvp = ump->um_devvp;
   2213 	vref(ip->i_devvp);
   2214 
   2215 	/* Set up a new generation number for this inode.  */
   2216 	ip->i_gen++;
   2217 	DIP_ASSIGN(ip, gen, ip->i_gen);
   2218 	if (fs->fs_magic == FS_UFS2_MAGIC) {
   2219 		vfs_timestamp(&ts);
   2220 		ip->i_ffs2_birthtime = ts.tv_sec;
   2221 		ip->i_ffs2_birthnsec = ts.tv_nsec;
   2222 	}
   2223 
   2224 	uvm_vnp_setsize(vp, ip->i_size);
   2225 	*new_key = &ip->i_number;
   2226 	return 0;
   2227 }
   2228 
   2229 /*
   2230  * File handle to vnode
   2231  *
   2232  * Have to be really careful about stale file handles:
   2233  * - check that the inode number is valid
   2234  * - call ffs_vget() to get the locked inode
   2235  * - check for an unallocated inode (i_mode == 0)
   2236  * - check that the given client host has export rights and return
   2237  *   those rights via. exflagsp and credanonp
   2238  */
   2239 int
   2240 ffs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
   2241 {
   2242 	struct ufid ufh;
   2243 	int error;
   2244 
   2245 	if (fhp->fid_len != sizeof(struct ufid))
   2246 		return EINVAL;
   2247 
   2248 	memcpy(&ufh, fhp, sizeof(ufh));
   2249 	if ((error = ffs_checkrange(mp, ufh.ufid_ino)) != 0)
   2250 		return error;
   2251 
   2252 	return (ufs_fhtovp(mp, &ufh, vpp));
   2253 }
   2254 
   2255 /*
   2256  * Vnode pointer to File handle
   2257  */
   2258 /* ARGSUSED */
   2259 int
   2260 ffs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
   2261 {
   2262 	struct inode *ip;
   2263 	struct ufid ufh;
   2264 
   2265 	if (*fh_size < sizeof(struct ufid)) {
   2266 		*fh_size = sizeof(struct ufid);
   2267 		return E2BIG;
   2268 	}
   2269 	ip = VTOI(vp);
   2270 	*fh_size = sizeof(struct ufid);
   2271 	memset(&ufh, 0, sizeof(ufh));
   2272 	ufh.ufid_len = sizeof(struct ufid);
   2273 	ufh.ufid_ino = ip->i_number;
   2274 	ufh.ufid_gen = ip->i_gen;
   2275 	memcpy(fhp, &ufh, sizeof(ufh));
   2276 	return (0);
   2277 }
   2278 
   2279 void
   2280 ffs_init(void)
   2281 {
   2282 	if (ffs_initcount++ > 0)
   2283 		return;
   2284 
   2285 	ffs_inode_cache = pool_cache_init(sizeof(struct inode), 0, 0, 0,
   2286 	    "ffsino", NULL, IPL_NONE, NULL, NULL, NULL);
   2287 	ffs_dinode1_cache = pool_cache_init(sizeof(struct ufs1_dinode), 0, 0, 0,
   2288 	    "ffsdino1", NULL, IPL_NONE, NULL, NULL, NULL);
   2289 	ffs_dinode2_cache = pool_cache_init(sizeof(struct ufs2_dinode), 0, 0, 0,
   2290 	    "ffsdino2", NULL, IPL_NONE, NULL, NULL, NULL);
   2291 	ufs_init();
   2292 }
   2293 
   2294 void
   2295 ffs_reinit(void)
   2296 {
   2297 	ufs_reinit();
   2298 }
   2299 
   2300 void
   2301 ffs_done(void)
   2302 {
   2303 	if (--ffs_initcount > 0)
   2304 		return;
   2305 
   2306 	ufs_done();
   2307 	pool_cache_destroy(ffs_dinode2_cache);
   2308 	pool_cache_destroy(ffs_dinode1_cache);
   2309 	pool_cache_destroy(ffs_inode_cache);
   2310 }
   2311 
   2312 /*
   2313  * Write a superblock and associated information back to disk.
   2314  */
   2315 int
   2316 ffs_sbupdate(struct ufsmount *mp, int waitfor)
   2317 {
   2318 	struct fs *fs = mp->um_fs;
   2319 	struct fs *bfs;
   2320 	struct buf *bp;
   2321 	int error;
   2322 
   2323 	error = ffs_getblk(mp->um_devvp,
   2324 	    fs->fs_sblockloc / DEV_BSIZE, FFS_NOBLK,
   2325 	    fs->fs_sbsize, false, &bp);
   2326 	if (error)
   2327 		return error;
   2328 
   2329 	mutex_enter(&mp->um_lock);
   2330 	memcpy(bp->b_data, fs, fs->fs_sbsize);
   2331 	mutex_exit(&mp->um_lock);
   2332 
   2333 	bfs = (struct fs *)bp->b_data;
   2334 
   2335 	bfs->fs_flags &= ~FS_INTERNAL;
   2336 	ffs_oldfscompat_write((struct fs *)bp->b_data, mp);
   2337 #ifdef FFS_EI
   2338 	if (mp->um_flags & UFS_NEEDSWAP)
   2339 		ffs_sb_swap(bfs, bfs);
   2340 #endif
   2341 
   2342 	if (waitfor == MNT_WAIT)
   2343 		error = bwrite(bp);
   2344 	else
   2345 		bawrite(bp);
   2346 	return (error);
   2347 }
   2348 
   2349 int
   2350 ffs_cgupdate(struct ufsmount *mp, int waitfor)
   2351 {
   2352 	struct fs *fs = mp->um_fs;
   2353 	struct buf *bp;
   2354 	int blks;
   2355 	void *space;
   2356 	int i, size, error = 0, allerror = 0;
   2357 
   2358 	UFS_WAPBL_JLOCK_ASSERT(mp->um_mountp);
   2359 
   2360 	allerror = ffs_sbupdate(mp, waitfor);
   2361 	blks = howmany(fs->fs_cssize, fs->fs_fsize);
   2362 	space = fs->fs_csp;
   2363 	for (i = 0; i < blks; i += fs->fs_frag) {
   2364 		size = fs->fs_bsize;
   2365 		if (i + fs->fs_frag > blks)
   2366 			size = (blks - i) * fs->fs_fsize;
   2367 		error = ffs_getblk(mp->um_devvp, FFS_FSBTODB(fs, fs->fs_csaddr + i),
   2368 		    FFS_NOBLK, size, false, &bp);
   2369 		if (error)
   2370 			break;
   2371 #ifdef FFS_EI
   2372 		if (mp->um_flags & UFS_NEEDSWAP)
   2373 			ffs_csum_swap((struct csum*)space,
   2374 			    (struct csum*)bp->b_data, size);
   2375 		else
   2376 #endif
   2377 			memcpy(bp->b_data, space, (u_int)size);
   2378 		space = (char *)space + size;
   2379 		if (waitfor == MNT_WAIT)
   2380 			error = bwrite(bp);
   2381 		else
   2382 			bawrite(bp);
   2383 	}
   2384 	if (!allerror && error)
   2385 		allerror = error;
   2386 	return (allerror);
   2387 }
   2388 
   2389 int
   2390 ffs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
   2391     int attrnamespace, const char *attrname)
   2392 {
   2393 #ifdef UFS_EXTATTR
   2394 	/*
   2395 	 * File-backed extended attributes are only supported on UFS1.
   2396 	 * UFS2 has native extended attributes.
   2397 	 */
   2398 	if (VFSTOUFS(mp)->um_fstype == UFS1)
   2399 		return (ufs_extattrctl(mp, cmd, vp, attrnamespace, attrname));
   2400 #endif
   2401 	return (vfs_stdextattrctl(mp, cmd, vp, attrnamespace, attrname));
   2402 }
   2403 
   2404 /*
   2405  * Synch vnode for a mounted file system.
   2406  */
   2407 static int
   2408 ffs_vfs_fsync(vnode_t *vp, int flags)
   2409 {
   2410 	int error, i, pflags;
   2411 #ifdef WAPBL
   2412 	struct mount *mp;
   2413 #endif
   2414 
   2415 	KASSERT(vp->v_type == VBLK);
   2416 	KASSERT(spec_node_getmountedfs(vp) != NULL);
   2417 
   2418 	/*
   2419 	 * Flush all dirty data associated with the vnode.
   2420 	 */
   2421 	pflags = PGO_ALLPAGES | PGO_CLEANIT;
   2422 	if ((flags & FSYNC_WAIT) != 0)
   2423 		pflags |= PGO_SYNCIO;
   2424 	mutex_enter(vp->v_interlock);
   2425 	error = VOP_PUTPAGES(vp, 0, 0, pflags);
   2426 	if (error)
   2427 		return error;
   2428 
   2429 #ifdef WAPBL
   2430 	mp = spec_node_getmountedfs(vp);
   2431 	if (mp && mp->mnt_wapbl) {
   2432 		/*
   2433 		 * Don't bother writing out metadata if the syncer is
   2434 		 * making the request.  We will let the sync vnode
   2435 		 * write it out in a single burst through a call to
   2436 		 * VFS_SYNC().
   2437 		 */
   2438 		if ((flags & (FSYNC_DATAONLY | FSYNC_LAZY | FSYNC_NOLOG)) != 0)
   2439 			return 0;
   2440 
   2441 		/*
   2442 		 * Don't flush the log if the vnode being flushed
   2443 		 * contains no dirty buffers that could be in the log.
   2444 		 */
   2445 		if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
   2446 			error = wapbl_flush(mp->mnt_wapbl, 0);
   2447 			if (error)
   2448 				return error;
   2449 		}
   2450 
   2451 		if ((flags & FSYNC_WAIT) != 0) {
   2452 			mutex_enter(vp->v_interlock);
   2453 			while (vp->v_numoutput)
   2454 				cv_wait(&vp->v_cv, vp->v_interlock);
   2455 			mutex_exit(vp->v_interlock);
   2456 		}
   2457 
   2458 		return 0;
   2459 	}
   2460 #endif /* WAPBL */
   2461 
   2462 	error = vflushbuf(vp, flags);
   2463 	if (error == 0 && (flags & FSYNC_CACHE) != 0) {
   2464 		i = 1;
   2465 		(void)VOP_IOCTL(vp, DIOCCACHESYNC, &i, FWRITE,
   2466 		    kauth_cred_get());
   2467 	}
   2468 
   2469 	return error;
   2470 }
   2471