FreeBSD/Linux Kernel Cross Reference
sys/ufs/ffs/ffs_vfsops.c

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1989, 1991, 1993, 1994
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)ffs_vfsops.c        8.31 (Berkeley) 5/20/95
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_quota.h"
    #include "opt_ufs.h"
    #include "opt_ffs.h"
    #include "opt_ddb.h"
    
    #include <sys/param.h>
    #include <sys/gsb_crc32.h>
    #include <sys/systm.h>
    #include <sys/namei.h>
    #include <sys/priv.h>
    #include <sys/proc.h>
    #include <sys/taskqueue.h>
    #include <sys/kernel.h>
    #include <sys/ktr.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/conf.h>
    #include <sys/fcntl.h>
    #include <sys/ioccom.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/rwlock.h>
    #include <sys/sysctl.h>
    #include <sys/vmmeter.h>
    
    #include <security/mac/mac_framework.h>
    
    #include <ufs/ufs/dir.h>
    #include <ufs/ufs/extattr.h>
    #include <ufs/ufs/gjournal.h>
    #include <ufs/ufs/quota.h>
    #include <ufs/ufs/ufsmount.h>
    #include <ufs/ufs/inode.h>
    #include <ufs/ufs/ufs_extern.h>
    
    #include <ufs/ffs/fs.h>
    #include <ufs/ffs/ffs_extern.h>
    
    #include <vm/vm.h>
    #include <vm/uma.h>
    #include <vm/vm_page.h>
    
    #include <geom/geom.h>
    #include <geom/geom_vfs.h>
    
    #include <ddb/ddb.h>
    
    static uma_zone_t uma_inode, uma_ufs1, uma_ufs2;
    VFS_SMR_DECLARE;
    
    static int      ffs_mountfs(struct vnode *, struct mount *, struct thread *);
    static void     ffs_oldfscompat_read(struct fs *, struct ufsmount *,
                        ufs2_daddr_t);
    static void     ffs_ifree(struct ufsmount *ump, struct inode *ip);
    static int      ffs_sync_lazy(struct mount *mp);
    static int      ffs_use_bread(void *devfd, off_t loc, void **bufp, int size);
    static int      ffs_use_bwrite(void *devfd, off_t loc, void *buf, int size);
    
    static vfs_init_t ffs_init;
    static vfs_uninit_t ffs_uninit;
    static vfs_extattrctl_t ffs_extattrctl;
   static vfs_cmount_t ffs_cmount;
   static vfs_unmount_t ffs_unmount;
   static vfs_mount_t ffs_mount;
   static vfs_statfs_t ffs_statfs;
   static vfs_fhtovp_t ffs_fhtovp;
   static vfs_sync_t ffs_sync;
   
   static struct vfsops ufs_vfsops = {
           .vfs_extattrctl =       ffs_extattrctl,
           .vfs_fhtovp =           ffs_fhtovp,
           .vfs_init =             ffs_init,
           .vfs_mount =            ffs_mount,
           .vfs_cmount =           ffs_cmount,
           .vfs_quotactl =         ufs_quotactl,
           .vfs_root =             vfs_cache_root,
           .vfs_cachedroot =       ufs_root,
           .vfs_statfs =           ffs_statfs,
           .vfs_sync =             ffs_sync,
           .vfs_uninit =           ffs_uninit,
           .vfs_unmount =          ffs_unmount,
           .vfs_vget =             ffs_vget,
           .vfs_susp_clean =       process_deferred_inactive,
   };
   
   VFS_SET(ufs_vfsops, ufs, 0);
   MODULE_VERSION(ufs, 1);
   
   static b_strategy_t ffs_geom_strategy;
   static b_write_t ffs_bufwrite;
   
   static struct buf_ops ffs_ops = {
           .bop_name =     "FFS",
           .bop_write =    ffs_bufwrite,
           .bop_strategy = ffs_geom_strategy,
           .bop_sync =     bufsync,
   #ifdef NO_FFS_SNAPSHOT
           .bop_bdflush =  bufbdflush,
   #else
           .bop_bdflush =  ffs_bdflush,
   #endif
   };
   
   /*
    * Note that userquota and groupquota options are not currently used
    * by UFS/FFS code and generally mount(8) does not pass those options
    * from userland, but they can be passed by loader(8) via
    * vfs.root.mountfrom.options.
    */
   static const char *ffs_opts[] = { "acls", "async", "noatime", "noclusterr",
       "noclusterw", "noexec", "export", "force", "from", "groupquota",
       "multilabel", "nfsv4acls", "snapshot", "nosuid", "suiddir",
       "nosymfollow", "sync", "union", "userquota", "untrusted", NULL };
   
   static int ffs_enxio_enable = 1;
   SYSCTL_DECL(_vfs_ffs);
   SYSCTL_INT(_vfs_ffs, OID_AUTO, enxio_enable, CTLFLAG_RWTUN,
       &ffs_enxio_enable, 0,
       "enable mapping of other disk I/O errors to ENXIO");
   
   /*
    * Return buffer with the contents of block "offset" from the beginning of
    * directory "ip".  If "res" is non-zero, fill it in with a pointer to the
    * remaining space in the directory.
    */
   static int
   ffs_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp)
   {
           struct inode *ip;
           struct fs *fs;
           struct buf *bp;
           ufs_lbn_t lbn;
           int bsize, error;
   
           ip = VTOI(vp);
           fs = ITOFS(ip);
           lbn = lblkno(fs, offset);
           bsize = blksize(fs, ip, lbn);
   
           *bpp = NULL;
           error = bread(vp, lbn, bsize, NOCRED, &bp);
           if (error) {
                   return (error);
           }
           if (res)
                   *res = (char *)bp->b_data + blkoff(fs, offset);
           *bpp = bp;
           return (0);
   }
   
   /*
    * Load up the contents of an inode and copy the appropriate pieces
    * to the incore copy.
    */
   static int
   ffs_load_inode(struct buf *bp, struct inode *ip, struct fs *fs, ino_t ino)
   {
           struct ufs1_dinode *dip1;
           struct ufs2_dinode *dip2;
           int error;
   
           if (I_IS_UFS1(ip)) {
                   dip1 = ip->i_din1;
                   *dip1 =
                       *((struct ufs1_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
                   ip->i_mode = dip1->di_mode;
                   ip->i_nlink = dip1->di_nlink;
                   ip->i_effnlink = dip1->di_nlink;
                   ip->i_size = dip1->di_size;
                   ip->i_flags = dip1->di_flags;
                   ip->i_gen = dip1->di_gen;
                   ip->i_uid = dip1->di_uid;
                   ip->i_gid = dip1->di_gid;
                   return (0);
           }
           dip2 = ((struct ufs2_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
           if ((error = ffs_verify_dinode_ckhash(fs, dip2)) != 0 &&
               !ffs_fsfail_cleanup(ITOUMP(ip), error)) {
                   printf("%s: inode %jd: check-hash failed\n", fs->fs_fsmnt,
                       (intmax_t)ino);
                   return (error);
           }
           *ip->i_din2 = *dip2;
           dip2 = ip->i_din2;
           ip->i_mode = dip2->di_mode;
           ip->i_nlink = dip2->di_nlink;
           ip->i_effnlink = dip2->di_nlink;
           ip->i_size = dip2->di_size;
           ip->i_flags = dip2->di_flags;
           ip->i_gen = dip2->di_gen;
           ip->i_uid = dip2->di_uid;
           ip->i_gid = dip2->di_gid;
           return (0);
   }
   
   /*
    * Verify that a filesystem block number is a valid data block.
    * This routine is only called on untrusted filesystems.
    */
   static int
   ffs_check_blkno(struct mount *mp, ino_t inum, ufs2_daddr_t daddr, int blksize)
   {
           struct fs *fs;
           struct ufsmount *ump;
           ufs2_daddr_t end_daddr;
           int cg, havemtx;
   
           KASSERT((mp->mnt_flag & MNT_UNTRUSTED) != 0,
               ("ffs_check_blkno called on a trusted file system"));
           ump = VFSTOUFS(mp);
           fs = ump->um_fs;
           cg = dtog(fs, daddr);
           end_daddr = daddr + numfrags(fs, blksize);
           /*
            * Verify that the block number is a valid data block. Also check
            * that it does not point to an inode block or a superblock. Accept
            * blocks that are unalloacted (0) or part of snapshot metadata
            * (BLK_NOCOPY or BLK_SNAP).
            *
            * Thus, the block must be in a valid range for the filesystem and
            * either in the space before a backup superblock (except the first
            * cylinder group where that space is used by the bootstrap code) or
            * after the inode blocks and before the end of the cylinder group.
            */
           if ((uint64_t)daddr <= BLK_SNAP ||
               ((uint64_t)end_daddr <= fs->fs_size &&
               ((cg > 0 && end_daddr <= cgsblock(fs, cg)) ||
               (daddr >= cgdmin(fs, cg) &&
               end_daddr <= cgbase(fs, cg) + fs->fs_fpg))))
                   return (0);
           if ((havemtx = mtx_owned(UFS_MTX(ump))) == 0)
                   UFS_LOCK(ump);
           if (ppsratecheck(&ump->um_last_integritymsg,
               &ump->um_secs_integritymsg, 1)) {
                   UFS_UNLOCK(ump);
                   uprintf("\n%s: inode %jd, out-of-range indirect block "
                       "number %jd\n", mp->mnt_stat.f_mntonname, inum, daddr);
                   if (havemtx)
                           UFS_LOCK(ump);
           } else if (!havemtx)
                   UFS_UNLOCK(ump);
           return (EINTEGRITY);
   }
   
   /*
    * On first ENXIO error, initiate an asynchronous forcible unmount.
    * Used to unmount filesystems whose underlying media has gone away.
    *
    * Return true if a cleanup is in progress.
    */
   int
   ffs_fsfail_cleanup(struct ufsmount *ump, int error)
   {
           int retval;
   
           UFS_LOCK(ump);
           retval = ffs_fsfail_cleanup_locked(ump, error);
           UFS_UNLOCK(ump);
           return (retval);
   }
   
   int
   ffs_fsfail_cleanup_locked(struct ufsmount *ump, int error)
   {
           mtx_assert(UFS_MTX(ump), MA_OWNED);
           if (error == ENXIO && (ump->um_flags & UM_FSFAIL_CLEANUP) == 0) {
                   ump->um_flags |= UM_FSFAIL_CLEANUP;
                   /*
                    * Queue an async forced unmount.
                    */
                   vfs_ref(ump->um_mountp);
                   dounmount(ump->um_mountp,
                       MNT_FORCE | MNT_RECURSE | MNT_DEFERRED, curthread);
                   printf("UFS: forcibly unmounting %s from %s\n",
                       ump->um_mountp->mnt_stat.f_mntfromname,
                       ump->um_mountp->mnt_stat.f_mntonname);
           }
           return ((ump->um_flags & UM_FSFAIL_CLEANUP) != 0);
   }
   
   /*
    * Wrapper used during ENXIO cleanup to allocate empty buffers when
    * the kernel is unable to read the real one. They are needed so that
    * the soft updates code can use them to unwind its dependencies.
    */
   int
   ffs_breadz(struct ufsmount *ump, struct vnode *vp, daddr_t lblkno,
       daddr_t dblkno, int size, daddr_t *rablkno, int *rabsize, int cnt,
       struct ucred *cred, int flags, void (*ckhashfunc)(struct buf *),
       struct buf **bpp)
   {
           int error;
   
           flags |= GB_CVTENXIO;
           error = breadn_flags(vp, lblkno, dblkno, size, rablkno, rabsize, cnt,
               cred, flags, ckhashfunc, bpp);
           if (error != 0 && ffs_fsfail_cleanup(ump, error)) {
                   error = getblkx(vp, lblkno, dblkno, size, 0, 0, flags, bpp);
                   KASSERT(error == 0, ("getblkx failed"));
                   vfs_bio_bzero_buf(*bpp, 0, size);
           }
           return (error);
   }
   
   static int
   ffs_mount(struct mount *mp)
   {
           struct vnode *devvp, *odevvp;
           struct thread *td;
           struct ufsmount *ump = NULL;
           struct fs *fs;
           int error, flags;
           int error1 __diagused;
           uint64_t mntorflags, saved_mnt_flag;
           accmode_t accmode;
           struct nameidata ndp;
           char *fspec;
           bool mounted_softdep;
   
           td = curthread;
           if (vfs_filteropt(mp->mnt_optnew, ffs_opts))
                   return (EINVAL);
           if (uma_inode == NULL) {
                   uma_inode = uma_zcreate("FFS inode",
                       sizeof(struct inode), NULL, NULL, NULL, NULL,
                       UMA_ALIGN_PTR, 0);
                   uma_ufs1 = uma_zcreate("FFS1 dinode",
                       sizeof(struct ufs1_dinode), NULL, NULL, NULL, NULL,
                       UMA_ALIGN_PTR, 0);
                   uma_ufs2 = uma_zcreate("FFS2 dinode",
                       sizeof(struct ufs2_dinode), NULL, NULL, NULL, NULL,
                       UMA_ALIGN_PTR, 0);
                   VFS_SMR_ZONE_SET(uma_inode);
           }
   
           vfs_deleteopt(mp->mnt_optnew, "groupquota");
           vfs_deleteopt(mp->mnt_optnew, "userquota");
   
           fspec = vfs_getopts(mp->mnt_optnew, "from", &error);
           if (error)
                   return (error);
   
           mntorflags = 0;
           if (vfs_getopt(mp->mnt_optnew, "untrusted", NULL, NULL) == 0)
                   mntorflags |= MNT_UNTRUSTED;
   
           if (vfs_getopt(mp->mnt_optnew, "acls", NULL, NULL) == 0)
                   mntorflags |= MNT_ACLS;
   
           if (vfs_getopt(mp->mnt_optnew, "snapshot", NULL, NULL) == 0) {
                   mntorflags |= MNT_SNAPSHOT;
                   /*
                    * Once we have set the MNT_SNAPSHOT flag, do not
                    * persist "snapshot" in the options list.
                    */
                   vfs_deleteopt(mp->mnt_optnew, "snapshot");
                   vfs_deleteopt(mp->mnt_opt, "snapshot");
           }
   
           if (vfs_getopt(mp->mnt_optnew, "nfsv4acls", NULL, NULL) == 0) {
                   if (mntorflags & MNT_ACLS) {
                           vfs_mount_error(mp,
                               "\"acls\" and \"nfsv4acls\" options "
                               "are mutually exclusive");
                           return (EINVAL);
                   }
                   mntorflags |= MNT_NFS4ACLS;
           }
   
           MNT_ILOCK(mp);
           mp->mnt_kern_flag &= ~MNTK_FPLOOKUP;
           mp->mnt_flag |= mntorflags;
           MNT_IUNLOCK(mp);
   
           /*
            * If this is a snapshot request, take the snapshot.
            */
           if (mp->mnt_flag & MNT_SNAPSHOT) {
                   if ((mp->mnt_flag & MNT_UPDATE) == 0)
                           return (EINVAL);
                   return (ffs_snapshot(mp, fspec));
           }
   
           /*
            * Must not call namei() while owning busy ref.
            */
           if (mp->mnt_flag & MNT_UPDATE)
                   vfs_unbusy(mp);
   
           /*
            * Not an update, or updating the name: look up the name
            * and verify that it refers to a sensible disk device.
            */
           NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec);
           error = namei(&ndp);
           if ((mp->mnt_flag & MNT_UPDATE) != 0) {
                   /*
                    * Unmount does not start if MNT_UPDATE is set.  Mount
                    * update busies mp before setting MNT_UPDATE.  We
                    * must be able to retain our busy ref successfully,
                    * without sleep.
                    */
                   error1 = vfs_busy(mp, MBF_NOWAIT);
                   MPASS(error1 == 0);
           }
           if (error != 0)
                   return (error);
           NDFREE_PNBUF(&ndp);
           if (!vn_isdisk_error(ndp.ni_vp, &error)) {
                   vput(ndp.ni_vp);
                   return (error);
           }
   
           /*
            * If mount by non-root, then verify that user has necessary
            * permissions on the device.
            */
           accmode = VREAD;
           if ((mp->mnt_flag & MNT_RDONLY) == 0)
                   accmode |= VWRITE;
           error = VOP_ACCESS(ndp.ni_vp, accmode, td->td_ucred, td);
           if (error)
                   error = priv_check(td, PRIV_VFS_MOUNT_PERM);
           if (error) {
                   vput(ndp.ni_vp);
                   return (error);
           }
   
           /*
            * New mount
            *
            * We need the name for the mount point (also used for
            * "last mounted on") copied in. If an error occurs,
            * the mount point is discarded by the upper level code.
            * Note that vfs_mount_alloc() populates f_mntonname for us.
            */
           if ((mp->mnt_flag & MNT_UPDATE) == 0) {
                   if ((error = ffs_mountfs(ndp.ni_vp, mp, td)) != 0) {
                           vrele(ndp.ni_vp);
                           return (error);
                   }
           } else {
                   /*
                    * When updating, check whether changing from read-only to
                    * read/write; if there is no device name, that's all we do.
                    */
                   ump = VFSTOUFS(mp);
                   fs = ump->um_fs;
                   odevvp = ump->um_odevvp;
                   devvp = ump->um_devvp;
   
                   /*
                    * If it's not the same vnode, or at least the same device
                    * then it's not correct.
                    */
                   if (ndp.ni_vp->v_rdev != ump->um_odevvp->v_rdev)
                           error = EINVAL; /* needs translation */
                   vput(ndp.ni_vp);
                   if (error)
                           return (error);
                   if (fs->fs_ronly == 0 &&
                       vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
                           /*
                            * Flush any dirty data and suspend filesystem.
                            */
                           if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
                                   return (error);
                           error = vfs_write_suspend_umnt(mp);
                           if (error != 0)
                                   return (error);
   
                           fs->fs_ronly = 1;
                           if (MOUNTEDSOFTDEP(mp)) {
                                   MNT_ILOCK(mp);
                                   mp->mnt_flag &= ~MNT_SOFTDEP;
                                   MNT_IUNLOCK(mp);
                                   mounted_softdep = true;
                           } else
                                   mounted_softdep = false;
   
                           /*
                            * Check for and optionally get rid of files open
                            * for writing.
                            */
                           flags = WRITECLOSE;
                           if (mp->mnt_flag & MNT_FORCE)
                                   flags |= FORCECLOSE;
                           if (mounted_softdep) {
                                   error = softdep_flushfiles(mp, flags, td);
                           } else {
                                   error = ffs_flushfiles(mp, flags, td);
                           }
                           if (error) {
                                   fs->fs_ronly = 0;
                                   if (mounted_softdep) {
                                           MNT_ILOCK(mp);
                                           mp->mnt_flag |= MNT_SOFTDEP;
                                           MNT_IUNLOCK(mp);
                                   }
                                   vfs_write_resume(mp, 0);
                                   return (error);
                           }
   
                           if (fs->fs_pendingblocks != 0 ||
                               fs->fs_pendinginodes != 0) {
                                   printf("WARNING: %s Update error: blocks %jd "
                                       "files %d\n", fs->fs_fsmnt, 
                                       (intmax_t)fs->fs_pendingblocks,
                                       fs->fs_pendinginodes);
                                   fs->fs_pendingblocks = 0;
                                   fs->fs_pendinginodes = 0;
                           }
                           if ((fs->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0)
                                   fs->fs_clean = 1;
                           if ((error = ffs_sbupdate(ump, MNT_WAIT, 0)) != 0) {
                                   fs->fs_ronly = 0;
                                   fs->fs_clean = 0;
                                   if (mounted_softdep) {
                                           MNT_ILOCK(mp);
                                           mp->mnt_flag |= MNT_SOFTDEP;
                                           MNT_IUNLOCK(mp);
                                   }
                                   vfs_write_resume(mp, 0);
                                   return (error);
                           }
                           if (mounted_softdep)
                                   softdep_unmount(mp);
                           g_topology_lock();
                           /*
                            * Drop our write and exclusive access.
                            */
                           g_access(ump->um_cp, 0, -1, -1);
                           g_topology_unlock();
                           MNT_ILOCK(mp);
                           mp->mnt_flag |= MNT_RDONLY;
                           MNT_IUNLOCK(mp);
                           /*
                            * Allow the writers to note that filesystem
                            * is ro now.
                            */
                           vfs_write_resume(mp, 0);
                   }
                   if ((mp->mnt_flag & MNT_RELOAD) &&
                       (error = ffs_reload(mp, 0)) != 0)
                           return (error);
                   if (fs->fs_ronly &&
                       !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
                           /*
                            * If upgrade to read-write by non-root, then verify
                            * that user has necessary permissions on the device.
                            */
                           vn_lock(odevvp, LK_EXCLUSIVE | LK_RETRY);
                           error = VOP_ACCESS(odevvp, VREAD | VWRITE,
                               td->td_ucred, td);
                           if (error)
                                   error = priv_check(td, PRIV_VFS_MOUNT_PERM);
                           VOP_UNLOCK(odevvp);
                           if (error) {
                                   return (error);
                           }
                           fs->fs_flags &= ~FS_UNCLEAN;
                           if (fs->fs_clean == 0) {
                                   fs->fs_flags |= FS_UNCLEAN;
                                   if ((mp->mnt_flag & MNT_FORCE) ||
                                       ((fs->fs_flags &
                                        (FS_SUJ | FS_NEEDSFSCK)) == 0 &&
                                        (fs->fs_flags & FS_DOSOFTDEP))) {
                                           printf("WARNING: %s was not properly "
                                              "dismounted\n",
                                              mp->mnt_stat.f_mntonname);
                                   } else {
                                           vfs_mount_error(mp,
                                              "R/W mount of %s denied. %s.%s",
                                              mp->mnt_stat.f_mntonname,
                                              "Filesystem is not clean - run fsck",
                                              (fs->fs_flags & FS_SUJ) == 0 ? "" :
                                              " Forced mount will invalidate"
                                              " journal contents");
                                           return (EPERM);
                                   }
                           }
                           g_topology_lock();
                           /*
                            * Request exclusive write access.
                            */
                           error = g_access(ump->um_cp, 0, 1, 1);
                           g_topology_unlock();
                           if (error)
                                   return (error);
                           if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
                                   return (error);
                           error = vfs_write_suspend_umnt(mp);
                           if (error != 0)
                                   return (error);
                           fs->fs_ronly = 0;
                           MNT_ILOCK(mp);
                           saved_mnt_flag = MNT_RDONLY;
                           if (MOUNTEDSOFTDEP(mp) && (mp->mnt_flag &
                               MNT_ASYNC) != 0)
                                   saved_mnt_flag |= MNT_ASYNC;
                           mp->mnt_flag &= ~saved_mnt_flag;
                           MNT_IUNLOCK(mp);
                           fs->fs_mtime = time_second;
                           /* check to see if we need to start softdep */
                           if ((fs->fs_flags & FS_DOSOFTDEP) &&
                               (error = softdep_mount(devvp, mp, fs, td->td_ucred))){
                                   fs->fs_ronly = 1;
                                   MNT_ILOCK(mp);
                                   mp->mnt_flag |= saved_mnt_flag;
                                   MNT_IUNLOCK(mp);
                                   vfs_write_resume(mp, 0);
                                   return (error);
                           }
                           fs->fs_clean = 0;
                           if ((error = ffs_sbupdate(ump, MNT_WAIT, 0)) != 0) {
                                   fs->fs_ronly = 1;
                                   if ((fs->fs_flags & FS_DOSOFTDEP) != 0)
                                           softdep_unmount(mp);
                                   MNT_ILOCK(mp);
                                   mp->mnt_flag |= saved_mnt_flag;
                                   MNT_IUNLOCK(mp);
                                   vfs_write_resume(mp, 0);
                                   return (error);
                           }
                           if (fs->fs_snapinum[0] != 0)
                                   ffs_snapshot_mount(mp);
                           vfs_write_resume(mp, 0);
                   }
                   /*
                    * Soft updates is incompatible with "async",
                    * so if we are doing softupdates stop the user
                    * from setting the async flag in an update.
                    * Softdep_mount() clears it in an initial mount
                    * or ro->rw remount.
                    */
                   if (MOUNTEDSOFTDEP(mp)) {
                           /* XXX: Reset too late ? */
                           MNT_ILOCK(mp);
                           mp->mnt_flag &= ~MNT_ASYNC;
                           MNT_IUNLOCK(mp);
                   }
                   /*
                    * Keep MNT_ACLS flag if it is stored in superblock.
                    */
                   if ((fs->fs_flags & FS_ACLS) != 0) {
                           /* XXX: Set too late ? */
                           MNT_ILOCK(mp);
                           mp->mnt_flag |= MNT_ACLS;
                           MNT_IUNLOCK(mp);
                   }
   
                   if ((fs->fs_flags & FS_NFS4ACLS) != 0) {
                           /* XXX: Set too late ? */
                           MNT_ILOCK(mp);
                           mp->mnt_flag |= MNT_NFS4ACLS;
                           MNT_IUNLOCK(mp);
                   }
   
           }
   
           MNT_ILOCK(mp);
           /*
            * This is racy versus lookup, see ufs_fplookup_vexec for details.
            */
           if ((mp->mnt_kern_flag & MNTK_FPLOOKUP) != 0)
                   panic("MNTK_FPLOOKUP set on mount %p when it should not be", mp);
           if ((mp->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS | MNT_UNION)) == 0)
                   mp->mnt_kern_flag |= MNTK_FPLOOKUP;
           MNT_IUNLOCK(mp);
   
           vfs_mountedfrom(mp, fspec);
           return (0);
   }
   
   /*
    * Compatibility with old mount system call.
    */
   
   static int
   ffs_cmount(struct mntarg *ma, void *data, uint64_t flags)
   {
           struct ufs_args args;
           int error;
   
           if (data == NULL)
                   return (EINVAL);
           error = copyin(data, &args, sizeof args);
           if (error)
                   return (error);
   
           ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
           ma = mount_arg(ma, "export", &args.export, sizeof(args.export));
           error = kernel_mount(ma, flags);
   
           return (error);
   }
   
   /*
    * Reload all incore data for a filesystem (used after running fsck on
    * the root filesystem and finding things to fix). If the 'force' flag
    * is 0, the filesystem must be mounted read-only.
    *
    * Things to do to update the mount:
    *      1) invalidate all cached meta-data.
    *      2) re-read superblock from disk.
    *      3) re-read summary information from disk.
    *      4) invalidate all inactive vnodes.
    *      5) clear MNTK_SUSPEND2 and MNTK_SUSPENDED flags, allowing secondary
    *         writers, if requested.
    *      6) invalidate all cached file data.
    *      7) re-read inode data for all active vnodes.
    */
   int
   ffs_reload(struct mount *mp, int flags)
   {
           struct vnode *vp, *mvp, *devvp;
           struct inode *ip;
           void *space;
           struct buf *bp;
           struct fs *fs, *newfs;
           struct ufsmount *ump;
           ufs2_daddr_t sblockloc;
           int i, blks, error;
           u_long size;
           int32_t *lp;
   
           ump = VFSTOUFS(mp);
   
           MNT_ILOCK(mp);
           if ((mp->mnt_flag & MNT_RDONLY) == 0 && (flags & FFSR_FORCE) == 0) {
                   MNT_IUNLOCK(mp);
                   return (EINVAL);
           }
           MNT_IUNLOCK(mp);
   
           /*
            * Step 1: invalidate all cached meta-data.
            */
           devvp = VFSTOUFS(mp)->um_devvp;
           vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
           if (vinvalbuf(devvp, 0, 0, 0) != 0)
                   panic("ffs_reload: dirty1");
           VOP_UNLOCK(devvp);
   
           /*
            * Step 2: re-read superblock from disk.
            */
           fs = VFSTOUFS(mp)->um_fs;
           if ((error = bread(devvp, btodb(fs->fs_sblockloc), fs->fs_sbsize,
               NOCRED, &bp)) != 0)
                   return (error);
           newfs = (struct fs *)bp->b_data;
           if ((newfs->fs_magic != FS_UFS1_MAGIC &&
                newfs->fs_magic != FS_UFS2_MAGIC) ||
               newfs->fs_bsize > MAXBSIZE ||
               newfs->fs_bsize < sizeof(struct fs)) {
                           brelse(bp);
                           return (EIO);           /* XXX needs translation */
           }
           /*
            * Preserve the summary information, read-only status, and
            * superblock location by copying these fields into our new
            * superblock before using it to update the existing superblock.
            */
           newfs->fs_si = fs->fs_si;
           newfs->fs_ronly = fs->fs_ronly;
           sblockloc = fs->fs_sblockloc;
           bcopy(newfs, fs, (u_int)fs->fs_sbsize);
           brelse(bp);
           ump->um_bsize = fs->fs_bsize;
           ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
           ffs_oldfscompat_read(fs, VFSTOUFS(mp), sblockloc);
           UFS_LOCK(ump);
           if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
                   printf("WARNING: %s: reload pending error: blocks %jd "
                       "files %d\n", mp->mnt_stat.f_mntonname,
                       (intmax_t)fs->fs_pendingblocks, fs->fs_pendinginodes);
                   fs->fs_pendingblocks = 0;
                   fs->fs_pendinginodes = 0;
           }
           UFS_UNLOCK(ump);
   
           /*
            * Step 3: re-read summary information from disk.
            */
           size = fs->fs_cssize;
           blks = howmany(size, fs->fs_fsize);
           if (fs->fs_contigsumsize > 0)
                   size += fs->fs_ncg * sizeof(int32_t);
           size += fs->fs_ncg * sizeof(u_int8_t);
           free(fs->fs_csp, M_UFSMNT);
           space = malloc(size, M_UFSMNT, M_WAITOK);
           fs->fs_csp = space;
           for (i = 0; i < blks; i += fs->fs_frag) {
                   size = fs->fs_bsize;
                   if (i + fs->fs_frag > blks)
                           size = (blks - i) * fs->fs_fsize;
                   error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
                       NOCRED, &bp);
                   if (error)
                           return (error);
                   bcopy(bp->b_data, space, (u_int)size);
                   space = (char *)space + size;
                   brelse(bp);
           }
           /*
            * We no longer know anything about clusters per cylinder group.
            */
           if (fs->fs_contigsumsize > 0) {
                   fs->fs_maxcluster = lp = space;
                   for (i = 0; i < fs->fs_ncg; i++)
                           *lp++ = fs->fs_contigsumsize;
                   space = lp;
           }
           size = fs->fs_ncg * sizeof(u_int8_t);
           fs->fs_contigdirs = (u_int8_t *)space;
           bzero(fs->fs_contigdirs, size);
           if ((flags & FFSR_UNSUSPEND) != 0) {
                   MNT_ILOCK(mp);
                   mp->mnt_kern_flag &= ~(MNTK_SUSPENDED | MNTK_SUSPEND2);
                   wakeup(&mp->mnt_flag);
                   MNT_IUNLOCK(mp);
           }
   
   loop:
           MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
                   /*
                    * Skip syncer vnode.
                    */
                   if (vp->v_type == VNON) {
                           VI_UNLOCK(vp);
                           continue;
                   }
                   /*
                    * Step 4: invalidate all cached file data.
                    */
                   if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) {
                           MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
                           goto loop;
                   }
                   if (vinvalbuf(vp, 0, 0, 0))
                           panic("ffs_reload: dirty2");
                   /*
                    * Step 5: re-read inode data for all active vnodes.
                    */
                   ip = VTOI(vp);
                   error =
                       bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
                       (int)fs->fs_bsize, NOCRED, &bp);
                   if (error) {
                           vput(vp);
                           MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
                           return (error);
                   }
                   if ((error = ffs_load_inode(bp, ip, fs, ip->i_number)) != 0) {
                           brelse(bp);
                           vput(vp);
                           MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
                           return (error);
                   }
                   ip->i_effnlink = ip->i_nlink;
                   brelse(bp);
                   vput(vp);
           }
           return (0);
   }
   
   /*
    * Common code for mount and mountroot
    */
   static int
   ffs_mountfs(struct vnode *odevvp, struct mount *mp, struct thread *td)
   {
           struct ufsmount *ump;
           struct fs *fs;
           struct cdev *dev;
           int error, i, len, ronly;
           struct ucred *cred;
           struct g_consumer *cp;
           struct mount *nmp;
           struct vnode *devvp;
           int candelete, canspeedup;
   
           fs = NULL;
           ump = NULL;
           cred = td ? td->td_ucred : NOCRED;
           ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
   
           devvp = mntfs_allocvp(mp, odevvp);
           KASSERT(devvp->v_type == VCHR, ("reclaimed devvp"));
           dev = devvp->v_rdev;
           KASSERT(dev->si_snapdata == NULL, ("non-NULL snapshot data"));
           if (atomic_cmpset_acq_ptr((uintptr_t *)&dev->si_mountpt, 0,
               (uintptr_t)mp) == 0) {
                   mntfs_freevp(devvp);
                   return (EBUSY);
           }
           g_topology_lock();
           error = g_vfs_open(devvp, &cp, "ffs", ronly ? 0 : 1);
           g_topology_unlock();
           if (error != 0) {
                   atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0);
                   mntfs_freevp(devvp);
                   return (error);
           }
           dev_ref(dev);
           devvp->v_bufobj.bo_ops = &ffs_ops;
           BO_LOCK(&odevvp->v_bufobj);
           odevvp->v_bufobj.bo_flag |= BO_NOBUFS;
           BO_UNLOCK(&odevvp->v_bufobj);
           VOP_UNLOCK(devvp);
           if (dev->si_iosize_max != 0)
                   mp->mnt_iosize_max = dev->si_iosize_max;
           if (mp->mnt_iosize_max > maxphys)
                   mp->mnt_iosize_max = maxphys;
           if ((SBLOCKSIZE % cp->provider->sectorsize) != 0) {
                   error = EINVAL;
                   vfs_mount_error(mp,
                       "Invalid sectorsize %d for superblock size %d",
                       cp->provider->sectorsize, SBLOCKSIZE);
                   goto out;
           }
           /* fetch the superblock and summary information */
           if ((mp->mnt_flag & (MNT_ROOTFS | MNT_FORCE)) != 0)
                   error = ffs_sbsearch(devvp, &fs, 0, M_UFSMNT, ffs_use_bread);
           else
                   error = ffs_sbget(devvp, &fs, UFS_STDSB, 0, M_UFSMNT,
                       ffs_use_bread);
           if (error != 0)
                   goto out;
           fs->fs_flags &= ~FS_UNCLEAN;
           if (fs->fs_clean == 0) {
                   fs->fs_flags |= FS_UNCLEAN;
                   if (ronly || (mp->mnt_flag & MNT_FORCE) ||
                       ((fs->fs_flags & (FS_SUJ | FS_NEEDSFSCK)) == 0 &&
                        (fs->fs_flags & FS_DOSOFTDEP))) {
                           printf("WARNING: %s was not properly dismounted\n",
                               mp->mnt_stat.f_mntonname);
                   } else {
                           vfs_mount_error(mp, "R/W mount on %s denied. "
                               "Filesystem is not clean - run fsck.%s",
                               mp->mnt_stat.f_mntonname,
                               (fs->fs_flags & FS_SUJ) == 0 ? "" :
                               " Forced mount will invalidate journal contents");
                           error = EPERM;
                           goto out;
                   }
                   if ((fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) &&
                       (mp->mnt_flag & MNT_FORCE)) {
                           printf("WARNING: %s: lost blocks %jd files %d\n",
                               mp->mnt_stat.f_mntonname,
                               (intmax_t)fs->fs_pendingblocks,
                               fs->fs_pendinginodes);
                           fs->fs_pendingblocks = 0;
                           fs->fs_pendinginodes = 0;
                   }
           }
           if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
                   printf("WARNING: %s: mount pending error: blocks %jd "
                       "files %d\n", mp->mnt_stat.f_mntonname,
                       (intmax_t)fs->fs_pendingblocks, fs->fs_pendinginodes);
                  fs->fs_pendingblocks = 0;
                  fs->fs_pendinginodes = 0;
          }
          if ((fs->fs_flags & FS_GJOURNAL) != 0) {
  #ifdef UFS_GJOURNAL
                  /*
                   * Get journal provider name.
                   */
                  len = 1024;
                  mp->mnt_gjprovider = malloc((u_long)len, M_UFSMNT, M_WAITOK);
                  if (g_io_getattr("GJOURNAL::provider", cp, &len,
                      mp->mnt_gjprovider) == 0) {
                          mp->mnt_gjprovider = realloc(mp->mnt_gjprovider, len,
                              M_UFSMNT, M_WAITOK);
                          MNT_ILOCK(mp);
                          mp->mnt_flag |= MNT_GJOURNAL;
                          MNT_IUNLOCK(mp);
                  } else {
                          if ((mp->mnt_flag & MNT_RDONLY) == 0)
                                  printf("WARNING: %s: GJOURNAL flag on fs "
                                      "but no gjournal provider below\n",
                                      mp->mnt_stat.f_mntonname);
                          free(mp->mnt_gjprovider, M_UFSMNT);
                          mp->mnt_gjprovider = NULL;
                  }
  #else
                  printf("WARNING: %s: GJOURNAL flag on fs but no "
                      "UFS_GJOURNAL support\n", mp->mnt_stat.f_mntonname);
  #endif
          } else {
                  mp->mnt_gjprovider = NULL;
          }
          ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO);
          ump->um_cp = cp;
          ump->um_bo = &devvp->v_bufobj;
          ump->um_fs = fs;
          if (fs->fs_magic == FS_UFS1_MAGIC) {
                  ump->um_fstype = UFS1;
                  ump->um_balloc = ffs_balloc_ufs1;
          } else {
                  ump->um_fstype = UFS2;
                  ump->um_balloc = ffs_balloc_ufs2;
          }
          ump->um_blkatoff = ffs_blkatoff;
          ump->um_truncate = ffs_truncate;
          ump->um_update = ffs_update;
          ump->um_valloc = ffs_valloc;
          ump->um_vfree = ffs_vfree;
          ump->um_ifree = ffs_ifree;
          ump->um_rdonly = ffs_rdonly;
          ump->um_snapgone = ffs_snapgone;
          if ((mp->mnt_flag & MNT_UNTRUSTED) != 0)
                  ump->um_check_blkno = ffs_check_blkno;
          else
                  ump->um_check_blkno = NULL;
          mtx_init(UFS_MTX(ump), "FFS", "FFS Lock", MTX_DEF);
          sx_init(&ump->um_checkpath_lock, "uchpth");
          ffs_oldfscompat_read(fs, ump, fs->fs_sblockloc);
          fs->fs_ronly = ronly;
          fs->fs_active = NULL;
          mp->mnt_data = ump;
          mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0];
          mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1];
          nmp = NULL;
          if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 ||
              (nmp = vfs_getvfs(&mp->mnt_stat.f_fsid))) {
                  if (nmp)
                          vfs_rel(nmp);
                  vfs_getnewfsid(mp);
          }
          ump->um_bsize = fs->fs_bsize;
          ump->um_maxsymlinklen = fs->fs_maxsymlinklen;
          MNT_ILOCK(mp);
          mp->mnt_flag |= MNT_LOCAL;
          MNT_IUNLOCK(mp);
          if ((fs->fs_flags & FS_MULTILABEL) != 0) {
  #ifdef MAC
                  MNT_ILOCK(mp);
                  mp->mnt_flag |= MNT_MULTILABEL;
                  MNT_IUNLOCK(mp);
  #else
                  printf("WARNING: %s: multilabel flag on fs but "
                      "no MAC support\n", mp->mnt_stat.f_mntonname);
  #endif
          }
          if ((fs->fs_flags & FS_ACLS) != 0) {
  #ifdef UFS_ACL
                  MNT_ILOCK(mp);
  
                  if (mp->mnt_flag & MNT_NFS4ACLS)
                          printf("WARNING: %s: ACLs flag on fs conflicts with "
                              "\"nfsv4acls\" mount option; option ignored\n",
                              mp->mnt_stat.f_mntonname);
                  mp->mnt_flag &= ~MNT_NFS4ACLS;
                  mp->mnt_flag |= MNT_ACLS;
  
                  MNT_IUNLOCK(mp);
  #else
                  printf("WARNING: %s: ACLs flag on fs but no ACLs support\n",
                      mp->mnt_stat.f_mntonname);
  #endif
          }
          if ((fs->fs_flags & FS_NFS4ACLS) != 0) {
  #ifdef UFS_ACL
                  MNT_ILOCK(mp);
  
                  if (mp->mnt_flag & MNT_ACLS)
                          printf("WARNING: %s: NFSv4 ACLs flag on fs conflicts "
                              "with \"acls\" mount option; option ignored\n",
                              mp->mnt_stat.f_mntonname);
                  mp->mnt_flag &= ~MNT_ACLS;
                  mp->mnt_flag |= MNT_NFS4ACLS;
  
                  MNT_IUNLOCK(mp);
  #else
                  printf("WARNING: %s: NFSv4 ACLs flag on fs but no "
                      "ACLs support\n", mp->mnt_stat.f_mntonname);
  #endif
          }
          if ((fs->fs_flags & FS_TRIM) != 0) {
                  len = sizeof(int);
                  if (g_io_getattr("GEOM::candelete", cp, &len,
                      &candelete) == 0) {
                          if (candelete)
                                  ump->um_flags |= UM_CANDELETE;
                          else
                                  printf("WARNING: %s: TRIM flag on fs but disk "
                                      "does not support TRIM\n",
                                      mp->mnt_stat.f_mntonname);
                  } else {
                          printf("WARNING: %s: TRIM flag on fs but disk does "
                              "not confirm that it supports TRIM\n",
                              mp->mnt_stat.f_mntonname);
                  }
                  if (((ump->um_flags) & UM_CANDELETE) != 0) {
                          ump->um_trim_tq = taskqueue_create("trim", M_WAITOK,
                              taskqueue_thread_enqueue, &ump->um_trim_tq);
                          taskqueue_start_threads(&ump->um_trim_tq, 1, PVFS,
                              "%s trim", mp->mnt_stat.f_mntonname);
                          ump->um_trimhash = hashinit(MAXTRIMIO, M_TRIM,
                              &ump->um_trimlisthashsize);
                  }
          }
  
          len = sizeof(int);
          if (g_io_getattr("GEOM::canspeedup", cp, &len, &canspeedup) == 0) {
                  if (canspeedup)
                          ump->um_flags |= UM_CANSPEEDUP;
          }
  
          ump->um_mountp = mp;
          ump->um_dev = dev;
          ump->um_devvp = devvp;
          ump->um_odevvp = odevvp;
          ump->um_nindir = fs->fs_nindir;
          ump->um_bptrtodb = fs->fs_fsbtodb;
          ump->um_seqinc = fs->fs_frag;
          for (i = 0; i < MAXQUOTAS; i++)
                  ump->um_quotas[i] = NULLVP;
  #ifdef UFS_EXTATTR
          ufs_extattr_uepm_init(&ump->um_extattr);
  #endif
          /*
           * Set FS local "last mounted on" information (NULL pad)
           */
          bzero(fs->fs_fsmnt, MAXMNTLEN);
          strlcpy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MAXMNTLEN);
          mp->mnt_stat.f_iosize = fs->fs_bsize;
  
          if (mp->mnt_flag & MNT_ROOTFS) {
                  /*
                   * Root mount; update timestamp in mount structure.
                   * this will be used by the common root mount code
                   * to update the system clock.
                   */
                  mp->mnt_time = fs->fs_time;
          }
  
          if (ronly == 0) {
                  fs->fs_mtime = time_second;
                  if ((fs->fs_flags & FS_DOSOFTDEP) &&
                      (error = softdep_mount(devvp, mp, fs, cred)) != 0) {
                          ffs_flushfiles(mp, FORCECLOSE, td);
                          goto out;
                  }
                  if (fs->fs_snapinum[0] != 0)
                          ffs_snapshot_mount(mp);
                  fs->fs_fmod = 1;
                  fs->fs_clean = 0;
                  (void) ffs_sbupdate(ump, MNT_WAIT, 0);
          }
          /*
           * Initialize filesystem state information in mount struct.
           */
          MNT_ILOCK(mp);
          mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
              MNTK_NO_IOPF | MNTK_UNMAPPED_BUFS | MNTK_USES_BCACHE;
          MNT_IUNLOCK(mp);
  #ifdef UFS_EXTATTR
  #ifdef UFS_EXTATTR_AUTOSTART
          /*
           *
           * Auto-starting does the following:
           *      - check for /.attribute in the fs, and extattr_start if so
           *      - for each file in .attribute, enable that file with
           *        an attribute of the same name.
           * Not clear how to report errors -- probably eat them.
           * This would all happen while the filesystem was busy/not
           * available, so would effectively be "atomic".
           */
          (void) ufs_extattr_autostart(mp, td);
  #endif /* !UFS_EXTATTR_AUTOSTART */
  #endif /* !UFS_EXTATTR */
          return (0);
  out:
          if (fs != NULL) {
                  free(fs->fs_csp, M_UFSMNT);
                  free(fs->fs_si, M_UFSMNT);
                  free(fs, M_UFSMNT);
          }
          if (cp != NULL) {
                  g_topology_lock();
                  g_vfs_close(cp);
                  g_topology_unlock();
          }
          if (ump != NULL) {
                  mtx_destroy(UFS_MTX(ump));
                  sx_destroy(&ump->um_checkpath_lock);
                  if (mp->mnt_gjprovider != NULL) {
                          free(mp->mnt_gjprovider, M_UFSMNT);
                          mp->mnt_gjprovider = NULL;
                  }
                  MPASS(ump->um_softdep == NULL);
                  free(ump, M_UFSMNT);
                  mp->mnt_data = NULL;
          }
          BO_LOCK(&odevvp->v_bufobj);
          odevvp->v_bufobj.bo_flag &= ~BO_NOBUFS;
          BO_UNLOCK(&odevvp->v_bufobj);
          atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0);
          vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
          mntfs_freevp(devvp);
          dev_rel(dev);
          return (error);
  }
  
  /*
   * A read function for use by filesystem-layer routines.
   */
  static int
  ffs_use_bread(void *devfd, off_t loc, void **bufp, int size)
  {
          struct buf *bp;
          int error;
  
          KASSERT(*bufp == NULL, ("ffs_use_bread: non-NULL *bufp %p\n", *bufp));
          *bufp = malloc(size, M_UFSMNT, M_WAITOK);
          if ((error = bread((struct vnode *)devfd, btodb(loc), size, NOCRED,
              &bp)) != 0)
                  return (error);
          bcopy(bp->b_data, *bufp, size);
          bp->b_flags |= B_INVAL | B_NOCACHE;
          brelse(bp);
          return (0);
  }
  
  static int bigcgs = 0;
  SYSCTL_INT(_debug, OID_AUTO, bigcgs, CTLFLAG_RW, &bigcgs, 0, "");
  
  /*
   * Sanity checks for loading old filesystem superblocks.
   * See ffs_oldfscompat_write below for unwound actions.
   *
   * XXX - Parts get retired eventually.
   * Unfortunately new bits get added.
   */
  static void
  ffs_oldfscompat_read(struct fs *fs,
          struct ufsmount *ump,
          ufs2_daddr_t sblockloc)
  {
          off_t maxfilesize;
  
          /*
           * If not yet done, update fs_flags location and value of fs_sblockloc.
           */
          if ((fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) {
                  fs->fs_flags = fs->fs_old_flags;
                  fs->fs_old_flags |= FS_FLAGS_UPDATED;
                  fs->fs_sblockloc = sblockloc;
          }
          /*
           * If not yet done, update UFS1 superblock with new wider fields.
           */
          if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_maxbsize != fs->fs_bsize) {
                  fs->fs_maxbsize = fs->fs_bsize;
                  fs->fs_time = fs->fs_old_time;
                  fs->fs_size = fs->fs_old_size;
                  fs->fs_dsize = fs->fs_old_dsize;
                  fs->fs_csaddr = fs->fs_old_csaddr;
                  fs->fs_cstotal.cs_ndir = fs->fs_old_cstotal.cs_ndir;
                  fs->fs_cstotal.cs_nbfree = fs->fs_old_cstotal.cs_nbfree;
                  fs->fs_cstotal.cs_nifree = fs->fs_old_cstotal.cs_nifree;
                  fs->fs_cstotal.cs_nffree = fs->fs_old_cstotal.cs_nffree;
          }
          if (fs->fs_magic == FS_UFS1_MAGIC &&
              fs->fs_old_inodefmt < FS_44INODEFMT) {
                  fs->fs_maxfilesize = ((uint64_t)1 << 31) - 1;
                  fs->fs_qbmask = ~fs->fs_bmask;
                  fs->fs_qfmask = ~fs->fs_fmask;
          }
          if (fs->fs_magic == FS_UFS1_MAGIC) {
                  ump->um_savedmaxfilesize = fs->fs_maxfilesize;
                  maxfilesize = (uint64_t)0x80000000 * fs->fs_bsize - 1;
                  if (fs->fs_maxfilesize > maxfilesize)
                          fs->fs_maxfilesize = maxfilesize;
          }
          /* Compatibility for old filesystems */
          if (fs->fs_avgfilesize <= 0)
                  fs->fs_avgfilesize = AVFILESIZ;
          if (fs->fs_avgfpdir <= 0)
                  fs->fs_avgfpdir = AFPDIR;
          if (bigcgs) {
                  fs->fs_save_cgsize = fs->fs_cgsize;
                  fs->fs_cgsize = fs->fs_bsize;
          }
  }
  
  /*
   * Unwinding superblock updates for old filesystems.
   * See ffs_oldfscompat_read above for details.
   *
   * XXX - Parts get retired eventually.
   * Unfortunately new bits get added.
   */
  void
  ffs_oldfscompat_write(struct fs *fs, struct ufsmount *ump)
  {
  
          /*
           * Copy back UFS2 updated fields that UFS1 inspects.
           */
          if (fs->fs_magic == FS_UFS1_MAGIC) {
                  fs->fs_old_time = fs->fs_time;
                  fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir;
                  fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree;
                  fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree;
                  fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree;
                  fs->fs_maxfilesize = ump->um_savedmaxfilesize;
          }
          if (bigcgs) {
                  fs->fs_cgsize = fs->fs_save_cgsize;
                  fs->fs_save_cgsize = 0;
          }
  }
  
  /*
   * unmount system call
   */
  static int
  ffs_unmount(struct mount *mp, int mntflags)
  {
          struct thread *td;
          struct ufsmount *ump = VFSTOUFS(mp);
          struct fs *fs;
          int error, flags, susp;
  #ifdef UFS_EXTATTR
          int e_restart;
  #endif
  
          flags = 0;
          td = curthread;
          fs = ump->um_fs;
          if (mntflags & MNT_FORCE)
                  flags |= FORCECLOSE;
          susp = fs->fs_ronly == 0;
  #ifdef UFS_EXTATTR
          if ((error = ufs_extattr_stop(mp, td))) {
                  if (error != EOPNOTSUPP)
                          printf("WARNING: unmount %s: ufs_extattr_stop "
                              "returned errno %d\n", mp->mnt_stat.f_mntonname,
                              error);
                  e_restart = 0;
          } else {
                  ufs_extattr_uepm_destroy(&ump->um_extattr);
                  e_restart = 1;
          }
  #endif
          if (susp) {
                  error = vfs_write_suspend_umnt(mp);
                  if (error != 0)
                          goto fail1;
          }
          if (MOUNTEDSOFTDEP(mp))
                  error = softdep_flushfiles(mp, flags, td);
          else
                  error = ffs_flushfiles(mp, flags, td);
          if (error != 0 && !ffs_fsfail_cleanup(ump, error))
                  goto fail;
  
          UFS_LOCK(ump);
          if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
                  printf("WARNING: unmount %s: pending error: blocks %jd "
                      "files %d\n", fs->fs_fsmnt, (intmax_t)fs->fs_pendingblocks,
                      fs->fs_pendinginodes);
                  fs->fs_pendingblocks = 0;
                  fs->fs_pendinginodes = 0;
          }
          UFS_UNLOCK(ump);
          if (MOUNTEDSOFTDEP(mp))
                  softdep_unmount(mp);
          MPASS(ump->um_softdep == NULL);
          if (fs->fs_ronly == 0) {
                  fs->fs_clean = fs->fs_flags & (FS_UNCLEAN|FS_NEEDSFSCK) ? 0 : 1;
                  error = ffs_sbupdate(ump, MNT_WAIT, 0);
                  if (ffs_fsfail_cleanup(ump, error))
                          error = 0;
                  if (error != 0 && !ffs_fsfail_cleanup(ump, error)) {
                          fs->fs_clean = 0;
                          goto fail;
                  }
          }
          if (susp)
                  vfs_write_resume(mp, VR_START_WRITE);
          if (ump->um_trim_tq != NULL) {
                  MPASS(ump->um_trim_inflight == 0);
                  taskqueue_free(ump->um_trim_tq);
                  free (ump->um_trimhash, M_TRIM);
          }
          vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
          g_topology_lock();
          g_vfs_close(ump->um_cp);
          g_topology_unlock();
          BO_LOCK(&ump->um_odevvp->v_bufobj);
          ump->um_odevvp->v_bufobj.bo_flag &= ~BO_NOBUFS;
          BO_UNLOCK(&ump->um_odevvp->v_bufobj);
          atomic_store_rel_ptr((uintptr_t *)&ump->um_dev->si_mountpt, 0);
          mntfs_freevp(ump->um_devvp);
          vrele(ump->um_odevvp);
          dev_rel(ump->um_dev);
          mtx_destroy(UFS_MTX(ump));
          sx_destroy(&ump->um_checkpath_lock);
          if (mp->mnt_gjprovider != NULL) {
                  free(mp->mnt_gjprovider, M_UFSMNT);
                  mp->mnt_gjprovider = NULL;
          }
          free(fs->fs_csp, M_UFSMNT);
          free(fs->fs_si, M_UFSMNT);
          free(fs, M_UFSMNT);
          free(ump, M_UFSMNT);
          mp->mnt_data = NULL;
          if (td->td_su == mp) {
                  td->td_su = NULL;
                  vfs_rel(mp);
          }
          return (error);
  
  fail:
          if (susp)
                  vfs_write_resume(mp, VR_START_WRITE);
  fail1:
  #ifdef UFS_EXTATTR
          if (e_restart) {
                  ufs_extattr_uepm_init(&ump->um_extattr);
  #ifdef UFS_EXTATTR_AUTOSTART
                  (void) ufs_extattr_autostart(mp, td);
  #endif
          }
  #endif
  
          return (error);
  }
  
  /*
   * Flush out all the files in a filesystem.
   */
  int
  ffs_flushfiles(struct mount *mp, int flags, struct thread *td)
  {
          struct ufsmount *ump;
          int qerror, error;
  
          ump = VFSTOUFS(mp);
          qerror = 0;
  #ifdef QUOTA
          if (mp->mnt_flag & MNT_QUOTA) {
                  int i;
                  error = vflush(mp, 0, SKIPSYSTEM|flags, td);
                  if (error)
                          return (error);
                  for (i = 0; i < MAXQUOTAS; i++) {
                          error = quotaoff(td, mp, i);
                          if (error != 0) {
                                  if ((flags & EARLYFLUSH) == 0)
                                          return (error);
                                  else
                                          qerror = error;
                          }
                  }
  
                  /*
                   * Here we fall through to vflush again to ensure that
                   * we have gotten rid of all the system vnodes, unless
                   * quotas must not be closed.
                   */
          }
  #endif
          /* devvp is not locked there */
          if (ump->um_devvp->v_vflag & VV_COPYONWRITE) {
                  if ((error = vflush(mp, 0, SKIPSYSTEM | flags, td)) != 0)
                          return (error);
                  ffs_snapshot_unmount(mp);
                  flags |= FORCECLOSE;
                  /*
                   * Here we fall through to vflush again to ensure
                   * that we have gotten rid of all the system vnodes.
                   */
          }
  
          /*
           * Do not close system files if quotas were not closed, to be
           * able to sync the remaining dquots.  The freeblks softupdate
           * workitems might hold a reference on a dquot, preventing
           * quotaoff() from completing.  Next round of
           * softdep_flushworklist() iteration should process the
           * blockers, allowing the next run of quotaoff() to finally
           * flush held dquots.
           *
           * Otherwise, flush all the files.
           */
          if (qerror == 0 && (error = vflush(mp, 0, flags, td)) != 0)
                  return (error);
  
          /*
           * If this is a forcible unmount and there were any files that
           * were unlinked but still open, then vflush() will have
           * truncated and freed those files, which might have started
           * some trim work.  Wait here for any trims to complete
           * and process the blkfrees which follow the trims.
           * This may create more dirty devvp buffers and softdep deps.
           */
          if (ump->um_trim_tq != NULL) {
                  while (ump->um_trim_inflight != 0)
                          pause("ufsutr", hz);
                  taskqueue_drain_all(ump->um_trim_tq);
          }
  
          /*
           * Flush filesystem metadata.
           */
          vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
          error = VOP_FSYNC(ump->um_devvp, MNT_WAIT, td);
          VOP_UNLOCK(ump->um_devvp);
          return (error);
  }
  
  /*
   * Get filesystem statistics.
   */
  static int
  ffs_statfs(struct mount *mp, struct statfs *sbp)
  {
          struct ufsmount *ump;
          struct fs *fs;
  
          ump = VFSTOUFS(mp);
          fs = ump->um_fs;
          if (fs->fs_magic != FS_UFS1_MAGIC && fs->fs_magic != FS_UFS2_MAGIC)
                  panic("ffs_statfs");
          sbp->f_version = STATFS_VERSION;
          sbp->f_bsize = fs->fs_fsize;
          sbp->f_iosize = fs->fs_bsize;
          sbp->f_blocks = fs->fs_dsize;
          UFS_LOCK(ump);
          sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
              fs->fs_cstotal.cs_nffree + dbtofsb(fs, fs->fs_pendingblocks);
          sbp->f_bavail = freespace(fs, fs->fs_minfree) +
              dbtofsb(fs, fs->fs_pendingblocks);
          sbp->f_files =  fs->fs_ncg * fs->fs_ipg - UFS_ROOTINO;
          sbp->f_ffree = fs->fs_cstotal.cs_nifree + fs->fs_pendinginodes;
          UFS_UNLOCK(ump);
          sbp->f_namemax = UFS_MAXNAMLEN;
          return (0);
  }
  
  static bool
  sync_doupdate(struct inode *ip)
  {
  
          return ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED |
              IN_UPDATE)) != 0);
  }
  
  static int
  ffs_sync_lazy_filter(struct vnode *vp, void *arg __unused)
  {
          struct inode *ip;
  
          /*
           * Flags are safe to access because ->v_data invalidation
           * is held off by listmtx.
           */
          if (vp->v_type == VNON)
                  return (false);
          ip = VTOI(vp);
          if (!sync_doupdate(ip) && (vp->v_iflag & VI_OWEINACT) == 0)
                  return (false);
          return (true);
  }
  
  /*
   * For a lazy sync, we only care about access times, quotas and the
   * superblock.  Other filesystem changes are already converted to
   * cylinder group blocks or inode blocks updates and are written to
   * disk by syncer.
   */
  static int
  ffs_sync_lazy(struct mount *mp)
  {
          struct vnode *mvp, *vp;
          struct inode *ip;
          int allerror, error;
  
          allerror = 0;
          if ((mp->mnt_flag & MNT_NOATIME) != 0) {
  #ifdef QUOTA
                  qsync(mp);
  #endif
                  goto sbupdate;
          }
          MNT_VNODE_FOREACH_LAZY(vp, mp, mvp, ffs_sync_lazy_filter, NULL) {
                  if (vp->v_type == VNON) {
                          VI_UNLOCK(vp);
                          continue;
                  }
                  ip = VTOI(vp);
  
                  /*
                   * The IN_ACCESS flag is converted to IN_MODIFIED by
                   * ufs_close() and ufs_getattr() by the calls to
                   * ufs_itimes_locked(), without subsequent UFS_UPDATE().
                   * Test also all the other timestamp flags too, to pick up
                   * any other cases that could be missed.
                   */
                  if (!sync_doupdate(ip) && (vp->v_iflag & VI_OWEINACT) == 0) {
                          VI_UNLOCK(vp);
                          continue;
                  }
                  if ((error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK)) != 0)
                          continue;
  #ifdef QUOTA
                  qsyncvp(vp);
  #endif
                  if (sync_doupdate(ip))
                          error = ffs_update(vp, 0);
                  if (error != 0)
                          allerror = error;
                  vput(vp);
          }
  sbupdate:
          if (VFSTOUFS(mp)->um_fs->fs_fmod != 0 &&
              (error = ffs_sbupdate(VFSTOUFS(mp), MNT_LAZY, 0)) != 0)
                  allerror = error;
          return (allerror);
  }
  
  /*
   * Go through the disk queues to initiate sandbagged IO;
   * go through the inodes to write those that have been modified;
   * initiate the writing of the super block if it has been modified.
   *
   * Note: we are always called with the filesystem marked busy using
   * vfs_busy().
   */
  static int
  ffs_sync(struct mount *mp, int waitfor)
  {
          struct vnode *mvp, *vp, *devvp;
          struct thread *td;
          struct inode *ip;
          struct ufsmount *ump = VFSTOUFS(mp);
          struct fs *fs;
          int error, count, lockreq, allerror = 0;
          int suspend;
          int suspended;
          int secondary_writes;
          int secondary_accwrites;
          int softdep_deps;
          int softdep_accdeps;
          struct bufobj *bo;
  
          suspend = 0;
          suspended = 0;
          td = curthread;
          fs = ump->um_fs;
          if (fs->fs_fmod != 0 && fs->fs_ronly != 0)
                  panic("%s: ffs_sync: modification on read-only filesystem",
                      fs->fs_fsmnt);
          if (waitfor == MNT_LAZY) {
                  if (!rebooting)
                          return (ffs_sync_lazy(mp));
                  waitfor = MNT_NOWAIT;
          }
  
          /*
           * Write back each (modified) inode.
           */
          lockreq = LK_EXCLUSIVE | LK_NOWAIT;
          if (waitfor == MNT_SUSPEND) {
                  suspend = 1;
                  waitfor = MNT_WAIT;
          }
          if (waitfor == MNT_WAIT)
                  lockreq = LK_EXCLUSIVE;
          lockreq |= LK_INTERLOCK | LK_SLEEPFAIL;
  loop:
          /* Grab snapshot of secondary write counts */
          MNT_ILOCK(mp);
          secondary_writes = mp->mnt_secondary_writes;
          secondary_accwrites = mp->mnt_secondary_accwrites;
          MNT_IUNLOCK(mp);
  
          /* Grab snapshot of softdep dependency counts */
          softdep_get_depcounts(mp, &softdep_deps, &softdep_accdeps);
  
          MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
                  /*
                   * Depend on the vnode interlock to keep things stable enough
                   * for a quick test.  Since there might be hundreds of
                   * thousands of vnodes, we cannot afford even a subroutine
                   * call unless there's a good chance that we have work to do.
                   */
                  if (vp->v_type == VNON) {
                          VI_UNLOCK(vp);
                          continue;
                  }
                  ip = VTOI(vp);
                  if ((ip->i_flag &
                      (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
                      vp->v_bufobj.bo_dirty.bv_cnt == 0) {
                          VI_UNLOCK(vp);
                          continue;
                  }
                  if ((error = vget(vp, lockreq)) != 0) {
                          if (error == ENOENT || error == ENOLCK) {
                                  MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
                                  goto loop;
                          }
                          continue;
                  }
  #ifdef QUOTA
                  qsyncvp(vp);
  #endif
                  for (;;) {
                          error = ffs_syncvnode(vp, waitfor, 0);
                          if (error == ERELOOKUP)
                                  continue;
                          if (error != 0)
                                  allerror = error;
                          break;
                  }
                  vput(vp);
          }
          /*
           * Force stale filesystem control information to be flushed.
           */
          if (waitfor == MNT_WAIT || rebooting) {
                  if ((error = softdep_flushworklist(ump->um_mountp, &count, td)))
                          allerror = error;
                  if (ffs_fsfail_cleanup(ump, allerror))
                          allerror = 0;
                  /* Flushed work items may create new vnodes to clean */
                  if (allerror == 0 && count)
                          goto loop;
          }
  
          devvp = ump->um_devvp;
          bo = &devvp->v_bufobj;
          BO_LOCK(bo);
          if (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0) {
                  BO_UNLOCK(bo);
                  vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
                  error = VOP_FSYNC(devvp, waitfor, td);
                  VOP_UNLOCK(devvp);
                  if (MOUNTEDSOFTDEP(mp) && (error == 0 || error == EAGAIN))
                          error = ffs_sbupdate(ump, waitfor, 0);
                  if (error != 0)
                          allerror = error;
                  if (ffs_fsfail_cleanup(ump, allerror))
                          allerror = 0;
                  if (allerror == 0 && waitfor == MNT_WAIT)
                          goto loop;
          } else if (suspend != 0) {
                  if (softdep_check_suspend(mp,
                                            devvp,
                                            softdep_deps,
                                            softdep_accdeps,
                                            secondary_writes,
                                            secondary_accwrites) != 0) {
                          MNT_IUNLOCK(mp);
                          goto loop;      /* More work needed */
                  }
                  mtx_assert(MNT_MTX(mp), MA_OWNED);
                  mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED;
                  MNT_IUNLOCK(mp);
                  suspended = 1;
          } else
                  BO_UNLOCK(bo);
          /*
           * Write back modified superblock.
           */
          if (fs->fs_fmod != 0 &&
              (error = ffs_sbupdate(ump, waitfor, suspended)) != 0)
                  allerror = error;
          if (ffs_fsfail_cleanup(ump, allerror))
                  allerror = 0;
          return (allerror);
  }
  
  int
  ffs_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
  {
          return (ffs_vgetf(mp, ino, flags, vpp, 0));
  }
  
  int
  ffs_vgetf(struct mount *mp,
          ino_t ino,
          int flags,
          struct vnode **vpp,
          int ffs_flags)
  {
          struct fs *fs;
          struct inode *ip;
          struct ufsmount *ump;
          struct buf *bp;
          struct vnode *vp;
          daddr_t dbn;
          int error;
  
          MPASS((ffs_flags & (FFSV_REPLACE | FFSV_REPLACE_DOOMED)) == 0 ||
              (flags & LK_EXCLUSIVE) != 0);
  
          error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
          if (error != 0)
                  return (error);
          if (*vpp != NULL) {
                  if ((ffs_flags & FFSV_REPLACE) == 0 ||
                      ((ffs_flags & FFSV_REPLACE_DOOMED) == 0 ||
                      !VN_IS_DOOMED(*vpp)))
                          return (0);
                  vgone(*vpp);
                  vput(*vpp);
          }
  
          /*
           * We must promote to an exclusive lock for vnode creation.  This
           * can happen if lookup is passed LOCKSHARED.
           */
          if ((flags & LK_TYPE_MASK) == LK_SHARED) {
                  flags &= ~LK_TYPE_MASK;
                  flags |= LK_EXCLUSIVE;
          }
  
          /*
           * We do not lock vnode creation as it is believed to be too
           * expensive for such rare case as simultaneous creation of vnode
           * for same ino by different processes. We just allow them to race
           * and check later to decide who wins. Let the race begin!
           */
  
          ump = VFSTOUFS(mp);
          fs = ump->um_fs;
          ip = uma_zalloc_smr(uma_inode, M_WAITOK | M_ZERO);
  
          /* Allocate a new vnode/inode. */
          error = getnewvnode("ufs", mp, fs->fs_magic == FS_UFS1_MAGIC ?
              &ffs_vnodeops1 : &ffs_vnodeops2, &vp);
          if (error) {
                  *vpp = NULL;
                  uma_zfree_smr(uma_inode, ip);
                  return (error);
          }
          /*
           * FFS supports recursive locking.
           */
          lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
          VN_LOCK_AREC(vp);
          vp->v_data = ip;
          vp->v_bufobj.bo_bsize = fs->fs_bsize;
          ip->i_vnode = vp;
          ip->i_ump = ump;
          ip->i_number = ino;
          ip->i_ea_refs = 0;
          ip->i_nextclustercg = -1;
          ip->i_flag = fs->fs_magic == FS_UFS1_MAGIC ? 0 : IN_UFS2;
          ip->i_mode = 0; /* ensure error cases below throw away vnode */
          cluster_init_vn(&ip->i_clusterw);
  #ifdef DIAGNOSTIC
          ufs_init_trackers(ip);
  #endif
  #ifdef QUOTA
          {
                  int i;
                  for (i = 0; i < MAXQUOTAS; i++)
                          ip->i_dquot[i] = NODQUOT;
          }
  #endif
  
          if (ffs_flags & FFSV_FORCEINSMQ)
                  vp->v_vflag |= VV_FORCEINSMQ;
          error = insmntque(vp, mp);
          if (error != 0) {
                  uma_zfree_smr(uma_inode, ip);
                  *vpp = NULL;
                  return (error);
          }
          vp->v_vflag &= ~VV_FORCEINSMQ;
          error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL);
          if (error != 0)
                  return (error);
          if (*vpp != NULL) {
                  /*
                   * Calls from ffs_valloc() (i.e. FFSV_REPLACE set)
                   * operate on empty inode, which must not be found by
                   * other threads until fully filled.  Vnode for empty
                   * inode must be not re-inserted on the hash by other
                   * thread, after removal by us at the beginning.
                   */
                  MPASS((ffs_flags & FFSV_REPLACE) == 0);
                  return (0);
          }
          if (I_IS_UFS1(ip))
                  ip->i_din1 = uma_zalloc(uma_ufs1, M_WAITOK);
          else
                  ip->i_din2 = uma_zalloc(uma_ufs2, M_WAITOK);
  
          if ((ffs_flags & FFSV_NEWINODE) != 0) {
                  /* New inode, just zero out its contents. */
                  if (I_IS_UFS1(ip))
                          memset(ip->i_din1, 0, sizeof(struct ufs1_dinode));
                  else
                          memset(ip->i_din2, 0, sizeof(struct ufs2_dinode));
          } else {
                  /* Read the disk contents for the inode, copy into the inode. */
                  dbn = fsbtodb(fs, ino_to_fsba(fs, ino));
                  error = ffs_breadz(ump, ump->um_devvp, dbn, dbn,
                      (int)fs->fs_bsize, NULL, NULL, 0, NOCRED, 0, NULL, &bp);
                  if (error != 0) {
                          /*
                           * The inode does not contain anything useful, so it
                           * would be misleading to leave it on its hash chain.
                           * With mode still zero, it will be unlinked and
                           * returned to the free list by vput().
                           */
                          vgone(vp);
                          vput(vp);
                          *vpp = NULL;
                          return (error);
                  }
                  if ((error = ffs_load_inode(bp, ip, fs, ino)) != 0) {
                          bqrelse(bp);
                          vgone(vp);
                          vput(vp);
                          *vpp = NULL;
                          return (error);
                  }
                  bqrelse(bp);
          }
          if (DOINGSOFTDEP(vp) && (!fs->fs_ronly ||
              (ffs_flags & FFSV_FORCEINODEDEP) != 0))
                  softdep_load_inodeblock(ip);
          else
                  ip->i_effnlink = ip->i_nlink;
  
          /*
           * Initialize the vnode from the inode, check for aliases.
           * Note that the underlying vnode may have changed.
           */
          error = ufs_vinit(mp, I_IS_UFS1(ip) ? &ffs_fifoops1 : &ffs_fifoops2,
              &vp);
          if (error) {
                  vgone(vp);
                  vput(vp);
                  *vpp = NULL;
                  return (error);
          }
  
          /*
           * Finish inode initialization.
           */
          if (vp->v_type != VFIFO) {
                  /* FFS supports shared locking for all files except fifos. */
                  VN_LOCK_ASHARE(vp);
          }
  
          /*
           * Set up a generation number for this inode if it does not
           * already have one. This should only happen on old filesystems.
           */
          if (ip->i_gen == 0) {
                  while (ip->i_gen == 0)
                          ip->i_gen = arc4random();
                  if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
                          UFS_INODE_SET_FLAG(ip, IN_MODIFIED);
                          DIP_SET(ip, i_gen, ip->i_gen);
                  }
          }
  #ifdef MAC
          if ((mp->mnt_flag & MNT_MULTILABEL) && ip->i_mode) {
                  /*
                   * If this vnode is already allocated, and we're running
                   * multi-label, attempt to perform a label association
                   * from the extended attributes on the inode.
                   */
                  error = mac_vnode_associate_extattr(mp, vp);
                  if (error) {
                          /* ufs_inactive will release ip->i_devvp ref. */
                          vgone(vp);
                          vput(vp);
                          *vpp = NULL;
                          return (error);
                  }
          }
  #endif
  
          vn_set_state(vp, VSTATE_CONSTRUCTED);
          *vpp = vp;
          return (0);
  }
  
  /*
   * File handle to vnode
   *
   * Have to be really careful about stale file handles:
   * - check that the inode number is valid
   * - for UFS2 check that the inode number is initialized
   * - call ffs_vget() to get the locked inode
   * - check for an unallocated inode (i_mode == 0)
   * - check that the given client host has export rights and return
   *   those rights via. exflagsp and credanonp
   */
  static int
  ffs_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
  {
          struct ufid *ufhp;
  
          ufhp = (struct ufid *)fhp;
          return (ffs_inotovp(mp, ufhp->ufid_ino, ufhp->ufid_gen, flags,
              vpp, 0));
  }
  
  int
  ffs_inotovp(struct mount *mp,
          ino_t ino,
          u_int64_t gen,
          int lflags,
          struct vnode **vpp,
          int ffs_flags)
  {
          struct ufsmount *ump;
          struct vnode *nvp;
          struct inode *ip;
          struct fs *fs;
          struct cg *cgp;
          struct buf *bp;
          u_int cg;
          int error;
  
          ump = VFSTOUFS(mp);
          fs = ump->um_fs;
          *vpp = NULL;
  
          if (ino < UFS_ROOTINO || ino >= fs->fs_ncg * fs->fs_ipg)
                  return (ESTALE);
  
          /*
           * Need to check if inode is initialized because UFS2 does lazy
           * initialization and nfs_fhtovp can offer arbitrary inode numbers.
           */
          if (fs->fs_magic == FS_UFS2_MAGIC) {
                  cg = ino_to_cg(fs, ino);
                  error = ffs_getcg(fs, ump->um_devvp, cg, 0, &bp, &cgp);
                  if (error != 0)
                          return (error);
                  if (ino >= cg * fs->fs_ipg + cgp->cg_initediblk) {
                          brelse(bp);
                          return (ESTALE);
                  }
                  brelse(bp);
          }
  
          error = ffs_vgetf(mp, ino, lflags, &nvp, ffs_flags);
          if (error != 0)
                  return (error);
  
          ip = VTOI(nvp);
          if (ip->i_mode == 0 || ip->i_gen != gen || ip->i_effnlink <= 0) {
                  if (ip->i_mode == 0)
                          vgone(nvp);
                  vput(nvp);
                  return (ESTALE);
          }
  
          vnode_create_vobject(nvp, DIP(ip, i_size), curthread);
          *vpp = nvp;
          return (0);
  }
  
  /*
   * Initialize the filesystem.
   */
  static int
  ffs_init(struct vfsconf *vfsp)
  {
  
          ffs_susp_initialize();
          softdep_initialize();
          return (ufs_init(vfsp));
  }
  
  /*
   * Undo the work of ffs_init().
   */
  static int
  ffs_uninit(struct vfsconf *vfsp)
  {
          int ret;
  
          ret = ufs_uninit(vfsp);
          softdep_uninitialize();
          ffs_susp_uninitialize();
          taskqueue_drain_all(taskqueue_thread);
          return (ret);
  }
  
  /*
   * Structure used to pass information from ffs_sbupdate to its
   * helper routine ffs_use_bwrite.
   */
  struct devfd {
          struct ufsmount *ump;
          struct buf      *sbbp;
          int              waitfor;
          int              suspended;
          int              error;
  };
  
  /*
   * Write a superblock and associated information back to disk.
   */
  int
  ffs_sbupdate(struct ufsmount *ump, int waitfor, int suspended)
  {
          struct fs *fs;
          struct buf *sbbp;
          struct devfd devfd;
  
          fs = ump->um_fs;
          if (fs->fs_ronly == 1 &&
              (ump->um_mountp->mnt_flag & (MNT_RDONLY | MNT_UPDATE)) !=
              (MNT_RDONLY | MNT_UPDATE))
                  panic("ffs_sbupdate: write read-only filesystem");
          /*
           * We use the superblock's buf to serialize calls to ffs_sbupdate().
           */
          sbbp = getblk(ump->um_devvp, btodb(fs->fs_sblockloc),
              (int)fs->fs_sbsize, 0, 0, 0);
          /*
           * Initialize info needed for write function.
           */
          devfd.ump = ump;
          devfd.sbbp = sbbp;
          devfd.waitfor = waitfor;
          devfd.suspended = suspended;
          devfd.error = 0;
          return (ffs_sbput(&devfd, fs, fs->fs_sblockloc, ffs_use_bwrite));
  }
  
  /*
   * Write function for use by filesystem-layer routines.
   */
  static int
  ffs_use_bwrite(void *devfd, off_t loc, void *buf, int size)
  {
          struct devfd *devfdp;
          struct ufsmount *ump;
          struct buf *bp;
          struct fs *fs;
          int error;
  
          devfdp = devfd;
          ump = devfdp->ump;
          fs = ump->um_fs;
          /*
           * Writing the superblock summary information.
           */
          if (loc != fs->fs_sblockloc) {
                  bp = getblk(ump->um_devvp, btodb(loc), size, 0, 0, 0);
                  bcopy(buf, bp->b_data, (u_int)size);
                  if (devfdp->suspended)
                          bp->b_flags |= B_VALIDSUSPWRT;
                  if (devfdp->waitfor != MNT_WAIT)
                          bawrite(bp);
                  else if ((error = bwrite(bp)) != 0)
                          devfdp->error = error;
                  return (0);
          }
          /*
           * Writing the superblock itself. We need to do special checks for it.
           */
          bp = devfdp->sbbp;
          if (ffs_fsfail_cleanup(ump, devfdp->error))
                  devfdp->error = 0;
          if (devfdp->error != 0) {
                  brelse(bp);
                  return (devfdp->error);
          }
          if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_sblockloc != SBLOCK_UFS1 &&
              (fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) {
                  printf("WARNING: %s: correcting fs_sblockloc from %jd to %d\n",
                      fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS1);
                  fs->fs_sblockloc = SBLOCK_UFS1;
          }
          if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_sblockloc != SBLOCK_UFS2 &&
              (fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) {
                  printf("WARNING: %s: correcting fs_sblockloc from %jd to %d\n",
                      fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS2);
                  fs->fs_sblockloc = SBLOCK_UFS2;
          }
          if (MOUNTEDSOFTDEP(ump->um_mountp))
                  softdep_setup_sbupdate(ump, (struct fs *)bp->b_data, bp);
          UFS_LOCK(ump);
          bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize);
          UFS_UNLOCK(ump);
          fs = (struct fs *)bp->b_data;
          fs->fs_fmod = 0;
          ffs_oldfscompat_write(fs, ump);
          fs->fs_si = NULL;
          /* Recalculate the superblock hash */
          fs->fs_ckhash = ffs_calc_sbhash(fs);
          if (devfdp->suspended)
                  bp->b_flags |= B_VALIDSUSPWRT;
          if (devfdp->waitfor != MNT_WAIT)
                  bawrite(bp);
          else if ((error = bwrite(bp)) != 0)
                  devfdp->error = error;
          return (devfdp->error);
  }
  
  static int
  ffs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
          int attrnamespace, const char *attrname)
  {
  
  #ifdef UFS_EXTATTR
          return (ufs_extattrctl(mp, cmd, filename_vp, attrnamespace,
              attrname));
  #else
          return (vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace,
              attrname));
  #endif
  }
  
  static void
  ffs_ifree(struct ufsmount *ump, struct inode *ip)
  {
  
          if (ump->um_fstype == UFS1 && ip->i_din1 != NULL)
                  uma_zfree(uma_ufs1, ip->i_din1);
          else if (ip->i_din2 != NULL)
                  uma_zfree(uma_ufs2, ip->i_din2);
          uma_zfree_smr(uma_inode, ip);
  }
  
  static int dobkgrdwrite = 1;
  SYSCTL_INT(_debug, OID_AUTO, dobkgrdwrite, CTLFLAG_RW, &dobkgrdwrite, 0,
      "Do background writes (honoring the BV_BKGRDWRITE flag)?");
  
  /*
   * Complete a background write started from bwrite.
   */
  static void
  ffs_backgroundwritedone(struct buf *bp)
  {
          struct bufobj *bufobj;
          struct buf *origbp;
  
  #ifdef SOFTUPDATES
          if (!LIST_EMPTY(&bp->b_dep) && (bp->b_ioflags & BIO_ERROR) != 0)
                  softdep_handle_error(bp);
  #endif
  
          /*
           * Find the original buffer that we are writing.
           */
          bufobj = bp->b_bufobj;
          BO_LOCK(bufobj);
          if ((origbp = gbincore(bp->b_bufobj, bp->b_lblkno)) == NULL)
                  panic("backgroundwritedone: lost buffer");
  
          /*
           * We should mark the cylinder group buffer origbp as
           * dirty, to not lose the failed write.
           */
          if ((bp->b_ioflags & BIO_ERROR) != 0)
                  origbp->b_vflags |= BV_BKGRDERR;
          BO_UNLOCK(bufobj);
          /*
           * Process dependencies then return any unfinished ones.
           */
          if (!LIST_EMPTY(&bp->b_dep) && (bp->b_ioflags & BIO_ERROR) == 0)
                  buf_complete(bp);
  #ifdef SOFTUPDATES
          if (!LIST_EMPTY(&bp->b_dep))
                  softdep_move_dependencies(bp, origbp);
  #endif
          /*
           * This buffer is marked B_NOCACHE so when it is released
           * by biodone it will be tossed.  Clear B_IOSTARTED in case of error.
           */
          bp->b_flags |= B_NOCACHE;
          bp->b_flags &= ~(B_CACHE | B_IOSTARTED);
          pbrelvp(bp);
  
          /*
           * Prevent brelse() from trying to keep and re-dirtying bp on
           * errors. It causes b_bufobj dereference in
           * bdirty()/reassignbuf(), and b_bufobj was cleared in
           * pbrelvp() above.
           */
          if ((bp->b_ioflags & BIO_ERROR) != 0)
                  bp->b_flags |= B_INVAL;
          bufdone(bp);
          BO_LOCK(bufobj);
          /*
           * Clear the BV_BKGRDINPROG flag in the original buffer
           * and awaken it if it is waiting for the write to complete.
           * If BV_BKGRDINPROG is not set in the original buffer it must
           * have been released and re-instantiated - which is not legal.
           */
          KASSERT((origbp->b_vflags & BV_BKGRDINPROG),
              ("backgroundwritedone: lost buffer2"));
          origbp->b_vflags &= ~BV_BKGRDINPROG;
          if (origbp->b_vflags & BV_BKGRDWAIT) {
                  origbp->b_vflags &= ~BV_BKGRDWAIT;
                  wakeup(&origbp->b_xflags);
          }
          BO_UNLOCK(bufobj);
  }
  
  /*
   * Write, release buffer on completion.  (Done by iodone
   * if async).  Do not bother writing anything if the buffer
   * is invalid.
   *
   * Note that we set B_CACHE here, indicating that buffer is
   * fully valid and thus cacheable.  This is true even of NFS
   * now so we set it generally.  This could be set either here
   * or in biodone() since the I/O is synchronous.  We put it
   * here.
   */
  static int
  ffs_bufwrite(struct buf *bp)
  {
          struct buf *newbp;
          struct cg *cgp;
  
          CTR3(KTR_BUF, "bufwrite(%p) vp %p flags %X", bp, bp->b_vp, bp->b_flags);
          if (bp->b_flags & B_INVAL) {
                  brelse(bp);
                  return (0);
          }
  
          if (!BUF_ISLOCKED(bp))
                  panic("bufwrite: buffer is not busy???");
          /*
           * If a background write is already in progress, delay
           * writing this block if it is asynchronous. Otherwise
           * wait for the background write to complete.
           */
          BO_LOCK(bp->b_bufobj);
          if (bp->b_vflags & BV_BKGRDINPROG) {
                  if (bp->b_flags & B_ASYNC) {
                          BO_UNLOCK(bp->b_bufobj);
                          bdwrite(bp);
                          return (0);
                  }
                  bp->b_vflags |= BV_BKGRDWAIT;
                  msleep(&bp->b_xflags, BO_LOCKPTR(bp->b_bufobj), PRIBIO,
                      "bwrbg", 0);
                  if (bp->b_vflags & BV_BKGRDINPROG)
                          panic("bufwrite: still writing");
          }
          bp->b_vflags &= ~BV_BKGRDERR;
          BO_UNLOCK(bp->b_bufobj);
  
          /*
           * If this buffer is marked for background writing and we
           * do not have to wait for it, make a copy and write the
           * copy so as to leave this buffer ready for further use.
           *
           * This optimization eats a lot of memory.  If we have a page
           * or buffer shortfall we can't do it.
           */
          if (dobkgrdwrite && (bp->b_xflags & BX_BKGRDWRITE) &&
              (bp->b_flags & B_ASYNC) &&
              !vm_page_count_severe() &&
              !buf_dirty_count_severe()) {
                  KASSERT(bp->b_iodone == NULL,
                      ("bufwrite: needs chained iodone (%p)", bp->b_iodone));
  
                  /* get a new block */
                  newbp = geteblk(bp->b_bufsize, GB_NOWAIT_BD);
                  if (newbp == NULL)
                          goto normal_write;
  
                  KASSERT(buf_mapped(bp), ("Unmapped cg"));
                  memcpy(newbp->b_data, bp->b_data, bp->b_bufsize);
                  BO_LOCK(bp->b_bufobj);
                  bp->b_vflags |= BV_BKGRDINPROG;
                  BO_UNLOCK(bp->b_bufobj);
                  newbp->b_xflags |=
                      (bp->b_xflags & BX_FSPRIV) | BX_BKGRDMARKER;
                  newbp->b_lblkno = bp->b_lblkno;
                  newbp->b_blkno = bp->b_blkno;
                  newbp->b_offset = bp->b_offset;
                  newbp->b_iodone = ffs_backgroundwritedone;
                  newbp->b_flags |= B_ASYNC;
                  newbp->b_flags &= ~B_INVAL;
                  pbgetvp(bp->b_vp, newbp);
  
  #ifdef SOFTUPDATES
                  /*
                   * Move over the dependencies.  If there are rollbacks,
                   * leave the parent buffer dirtied as it will need to
                   * be written again.
                   */
                  if (LIST_EMPTY(&bp->b_dep) ||
                      softdep_move_dependencies(bp, newbp) == 0)
                          bundirty(bp);
  #else
                  bundirty(bp);
  #endif
  
                  /*
                   * Initiate write on the copy, release the original.  The
                   * BKGRDINPROG flag prevents it from going away until 
                   * the background write completes. We have to recalculate
                   * its check hash in case the buffer gets freed and then
                   * reconstituted from the buffer cache during a later read.
                   */
                  if ((bp->b_xflags & BX_CYLGRP) != 0) {
                          cgp = (struct cg *)bp->b_data;
                          cgp->cg_ckhash = 0;
                          cgp->cg_ckhash =
                              calculate_crc32c(~0L, bp->b_data, bp->b_bcount);
                  }
                  bqrelse(bp);
                  bp = newbp;
          } else
                  /* Mark the buffer clean */
                  bundirty(bp);
  
          /* Let the normal bufwrite do the rest for us */
  normal_write:
          /*
           * If we are writing a cylinder group, update its time.
           */
          if ((bp->b_xflags & BX_CYLGRP) != 0) {
                  cgp = (struct cg *)bp->b_data;
                  cgp->cg_old_time = cgp->cg_time = time_second;
          }
          return (bufwrite(bp));
  }
  
  static void
  ffs_geom_strategy(struct bufobj *bo, struct buf *bp)
  {
          struct vnode *vp;
          struct buf *tbp;
          int error, nocopy;
  
          /*
           * This is the bufobj strategy for the private VCHR vnodes
           * used by FFS to access the underlying storage device.
           * We override the default bufobj strategy and thus bypass
           * VOP_STRATEGY() for these vnodes.
           */
          vp = bo2vnode(bo);
          KASSERT(bp->b_vp == NULL || bp->b_vp->v_type != VCHR ||
              bp->b_vp->v_rdev == NULL ||
              bp->b_vp->v_rdev->si_mountpt == NULL ||
              VFSTOUFS(bp->b_vp->v_rdev->si_mountpt) == NULL ||
              vp == VFSTOUFS(bp->b_vp->v_rdev->si_mountpt)->um_devvp,
              ("ffs_geom_strategy() with wrong vp"));
          if (bp->b_iocmd == BIO_WRITE) {
                  if ((bp->b_flags & B_VALIDSUSPWRT) == 0 &&
                      bp->b_vp != NULL && bp->b_vp->v_mount != NULL &&
                      (bp->b_vp->v_mount->mnt_kern_flag & MNTK_SUSPENDED) != 0)
                          panic("ffs_geom_strategy: bad I/O");
                  nocopy = bp->b_flags & B_NOCOPY;
                  bp->b_flags &= ~(B_VALIDSUSPWRT | B_NOCOPY);
                  if ((vp->v_vflag & VV_COPYONWRITE) && nocopy == 0 &&
                      vp->v_rdev->si_snapdata != NULL) {
                          if ((bp->b_flags & B_CLUSTER) != 0) {
                                  runningbufwakeup(bp);
                                  TAILQ_FOREACH(tbp, &bp->b_cluster.cluster_head,
                                                b_cluster.cluster_entry) {
                                          error = ffs_copyonwrite(vp, tbp);
                                          if (error != 0 &&
                                              error != EOPNOTSUPP) {
                                                  bp->b_error = error;
                                                  bp->b_ioflags |= BIO_ERROR;
                                                  bp->b_flags &= ~B_BARRIER;
                                                  bufdone(bp);
                                                  return;
                                          }
                                  }
                                  bp->b_runningbufspace = bp->b_bufsize;
                                  atomic_add_long(&runningbufspace,
                                                 bp->b_runningbufspace);
                          } else {
                                  error = ffs_copyonwrite(vp, bp);
                                  if (error != 0 && error != EOPNOTSUPP) {
                                          bp->b_error = error;
                                          bp->b_ioflags |= BIO_ERROR;
                                          bp->b_flags &= ~B_BARRIER;
                                          bufdone(bp);
                                          return;
                                  }
                          }
                  }
  #ifdef SOFTUPDATES
                  if ((bp->b_flags & B_CLUSTER) != 0) {
                          TAILQ_FOREACH(tbp, &bp->b_cluster.cluster_head,
                                        b_cluster.cluster_entry) {
                                  if (!LIST_EMPTY(&tbp->b_dep))
                                          buf_start(tbp);
                          }
                  } else {
                          if (!LIST_EMPTY(&bp->b_dep))
                                  buf_start(bp);
                  }
  
  #endif
                  /*
                   * Check for metadata that needs check-hashes and update them.
                   */
                  switch (bp->b_xflags & BX_FSPRIV) {
                  case BX_CYLGRP:
                          ((struct cg *)bp->b_data)->cg_ckhash = 0;
                          ((struct cg *)bp->b_data)->cg_ckhash =
                              calculate_crc32c(~0L, bp->b_data, bp->b_bcount);
                          break;
  
                  case BX_SUPERBLOCK:
                  case BX_INODE:
                  case BX_INDIR:
                  case BX_DIR:
                          printf("Check-hash write is unimplemented!!!\n");
                          break;
  
                  case 0:
                          break;
  
                  default:
                          printf("multiple buffer types 0x%b\n",
                              (u_int)(bp->b_xflags & BX_FSPRIV),
                              PRINT_UFS_BUF_XFLAGS);
                          break;
                  }
          }
          if (bp->b_iocmd != BIO_READ && ffs_enxio_enable)
                  bp->b_xflags |= BX_CVTENXIO;
          g_vfs_strategy(bo, bp);
  }
  
  int
  ffs_own_mount(const struct mount *mp)
  {
  
          if (mp->mnt_op == &ufs_vfsops)
                  return (1);
          return (0);
  }
  
  #ifdef  DDB
  #ifdef SOFTUPDATES
  
  /* defined in ffs_softdep.c */
  extern void db_print_ffs(struct ufsmount *ump);
  
  DB_SHOW_COMMAND(ffs, db_show_ffs)
  {
          struct mount *mp;
          struct ufsmount *ump;
  
          if (have_addr) {
                  ump = VFSTOUFS((struct mount *)addr);
                  db_print_ffs(ump);
                  return;
          }
  
          TAILQ_FOREACH(mp, &mountlist, mnt_list) {
                  if (!strcmp(mp->mnt_stat.f_fstypename, ufs_vfsconf.vfc_name))
                          db_print_ffs(VFSTOUFS(mp));
          }
  }
  
  #endif  /* SOFTUPDATES */
  #endif  /* DDB */

Cache object: 6d9b8b95d36721c66bb3533da1b01418