The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/ufs/lfs/lfs_vfsops.c

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    1 /*      $NetBSD: lfs_vfsops.c,v 1.146.2.1 2004/05/29 09:05:04 tron Exp $        */
    2 
    3 /*-
    4  * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Konrad E. Schroder <perseant@hhhh.org>.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 /*-
   39  * Copyright (c) 1989, 1991, 1993, 1994
   40  *      The Regents of the University of California.  All rights reserved.
   41  *
   42  * Redistribution and use in source and binary forms, with or without
   43  * modification, are permitted provided that the following conditions
   44  * are met:
   45  * 1. Redistributions of source code must retain the above copyright
   46  *    notice, this list of conditions and the following disclaimer.
   47  * 2. Redistributions in binary form must reproduce the above copyright
   48  *    notice, this list of conditions and the following disclaimer in the
   49  *    documentation and/or other materials provided with the distribution.
   50  * 3. Neither the name of the University nor the names of its contributors
   51  *    may be used to endorse or promote products derived from this software
   52  *    without specific prior written permission.
   53  *
   54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   64  * SUCH DAMAGE.
   65  *
   66  *      @(#)lfs_vfsops.c        8.20 (Berkeley) 6/10/95
   67  */
   68 
   69 #include <sys/cdefs.h>
   70 __KERNEL_RCSID(0, "$NetBSD: lfs_vfsops.c,v 1.146.2.1 2004/05/29 09:05:04 tron Exp $");
   71 
   72 #if defined(_KERNEL_OPT)
   73 #include "opt_quota.h"
   74 #endif
   75 
   76 #include <sys/param.h>
   77 #include <sys/systm.h>
   78 #include <sys/namei.h>
   79 #include <sys/proc.h>
   80 #include <sys/kernel.h>
   81 #include <sys/vnode.h>
   82 #include <sys/mount.h>
   83 #include <sys/kthread.h>
   84 #include <sys/buf.h>
   85 #include <sys/device.h>
   86 #include <sys/mbuf.h>
   87 #include <sys/file.h>
   88 #include <sys/disklabel.h>
   89 #include <sys/ioctl.h>
   90 #include <sys/errno.h>
   91 #include <sys/malloc.h>
   92 #include <sys/pool.h>
   93 #include <sys/socket.h>
   94 #include <uvm/uvm_extern.h>
   95 #include <sys/sysctl.h>
   96 #include <sys/conf.h>
   97 
   98 #include <miscfs/specfs/specdev.h>
   99 
  100 #include <ufs/ufs/quota.h>
  101 #include <ufs/ufs/inode.h>
  102 #include <ufs/ufs/ufsmount.h>
  103 #include <ufs/ufs/ufs_extern.h>
  104 
  105 #include <uvm/uvm.h>
  106 #include <uvm/uvm_stat.h>
  107 #include <uvm/uvm_pager.h>
  108 #include <uvm/uvm_pdaemon.h>
  109 
  110 #include <ufs/lfs/lfs.h>
  111 #include <ufs/lfs/lfs_extern.h>
  112 
  113 #include <miscfs/genfs/genfs.h>
  114 #include <miscfs/genfs/genfs_node.h>
  115 
  116 static int lfs_gop_write(struct vnode *, struct vm_page **, int, int);
  117 static boolean_t lfs_issequential_hole(const struct ufsmount *,
  118     daddr_t, daddr_t);
  119 
  120 static int lfs_mountfs(struct vnode *, struct mount *, struct proc *);
  121 static daddr_t check_segsum(struct lfs *, daddr_t, u_int64_t,
  122     struct ucred *, int, int *, struct proc *);
  123 
  124 extern const struct vnodeopv_desc lfs_vnodeop_opv_desc;
  125 extern const struct vnodeopv_desc lfs_specop_opv_desc;
  126 extern const struct vnodeopv_desc lfs_fifoop_opv_desc;
  127 
  128 pid_t lfs_writer_daemon = 0;
  129 int lfs_do_flush = 0;
  130 
  131 const struct vnodeopv_desc * const lfs_vnodeopv_descs[] = {
  132         &lfs_vnodeop_opv_desc,
  133         &lfs_specop_opv_desc,
  134         &lfs_fifoop_opv_desc,
  135         NULL,
  136 };
  137 
  138 struct vfsops lfs_vfsops = {
  139         MOUNT_LFS,
  140         lfs_mount,
  141         ufs_start,
  142         lfs_unmount,
  143         ufs_root,
  144         ufs_quotactl,
  145         lfs_statfs,
  146         lfs_sync,
  147         lfs_vget,
  148         lfs_fhtovp,
  149         lfs_vptofh,
  150         lfs_init,
  151         lfs_reinit,
  152         lfs_done,
  153         NULL,
  154         lfs_mountroot,
  155         ufs_check_export,
  156         lfs_vnodeopv_descs,
  157 };
  158 
  159 struct genfs_ops lfs_genfsops = {
  160         lfs_gop_size,
  161         ufs_gop_alloc,
  162         lfs_gop_write,
  163 };
  164 
  165 struct pool lfs_inode_pool;
  166 struct pool lfs_dinode_pool;
  167 struct pool lfs_inoext_pool;
  168 
  169 /*
  170  * The writer daemon.  UVM keeps track of how many dirty pages we are holding
  171  * in lfs_subsys_pages; the daemon flushes the filesystem when this value
  172  * crosses the (user-defined) threshhold LFS_MAX_PAGES.
  173  */
  174 static void
  175 lfs_writerd(void *arg)
  176 {
  177 #ifdef LFS_PD
  178         struct mount *mp, *nmp;
  179         struct lfs *fs;
  180 #endif
  181 
  182         lfs_writer_daemon = curproc->p_pid;
  183 
  184         simple_lock(&lfs_subsys_lock);
  185         for (;;) {
  186                 ltsleep(&lfs_writer_daemon, PVM | PNORELOCK, "lfswriter", 0,
  187                     &lfs_subsys_lock);
  188 
  189 #ifdef LFS_PD
  190                 /*
  191                  * Look through the list of LFSs to see if any of them
  192                  * have requested pageouts.
  193                  */
  194                 simple_lock(&mountlist_slock);
  195                 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
  196                      mp = nmp) {
  197                         if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
  198                                 nmp = CIRCLEQ_NEXT(mp, mnt_list);
  199                                 continue;
  200                         }
  201                         if (strncmp(&mp->mnt_stat.f_fstypename[0], MOUNT_LFS,
  202                                     MFSNAMELEN) == 0) {
  203                                 fs = VFSTOUFS(mp)->um_lfs;
  204                                 if (fs->lfs_pdflush ||
  205                                     !TAILQ_EMPTY(&fs->lfs_pchainhd)) {
  206                                         fs->lfs_pdflush = 0;
  207                                         lfs_flush_fs(fs, 0);
  208                                 }
  209                         }
  210 
  211                         simple_lock(&mountlist_slock);
  212                         nmp = CIRCLEQ_NEXT(mp, mnt_list);
  213                         vfs_unbusy(mp);
  214                 }
  215                 simple_unlock(&mountlist_slock);
  216 #endif /* LFS_PD */
  217 
  218                 /*
  219                  * If global state wants a flush, flush everything.
  220                  */
  221                 simple_lock(&lfs_subsys_lock);
  222                 while (lfs_do_flush || locked_queue_count > LFS_MAX_BUFS || 
  223                         locked_queue_bytes > LFS_MAX_BYTES ||
  224                         lfs_subsys_pages > LFS_MAX_PAGES) {
  225 
  226 #ifdef DEBUG_LFS_FLUSH
  227                         if (lfs_do_flush)
  228                                 printf("daemon: lfs_do_flush\n");
  229                         if (locked_queue_count > LFS_MAX_BUFS)
  230                                 printf("daemon: lqc = %d, max %d\n",
  231                                         locked_queue_count, LFS_MAX_BUFS);
  232                         if (locked_queue_bytes > LFS_MAX_BYTES)
  233                                 printf("daemon: lqb = %ld, max %ld\n",
  234                                         locked_queue_bytes, LFS_MAX_BYTES);
  235                         if (lfs_subsys_pages > LFS_MAX_PAGES) 
  236                                 printf("daemon: lssp = %d, max %d\n",
  237                                         lfs_subsys_pages, LFS_MAX_PAGES);
  238 #endif /* DEBUG_LFS_FLUSH */
  239                         lfs_flush(NULL, SEGM_WRITERD);
  240                         lfs_do_flush = 0;
  241                 }
  242         }
  243         /* NOTREACHED */
  244 }
  245 
  246 /*
  247  * Initialize the filesystem, most work done by ufs_init.
  248  */
  249 void
  250 lfs_init()
  251 {
  252 #ifdef _LKM
  253         malloc_type_attach(M_SEGMENT);
  254 #endif
  255         ufs_init();
  256 
  257         /*
  258          * XXX Same structure as FFS inodes?  Should we share a common pool?
  259          */
  260         pool_init(&lfs_inode_pool, sizeof(struct inode), 0, 0, 0,
  261                   "lfsinopl", &pool_allocator_nointr);
  262         pool_init(&lfs_dinode_pool, sizeof(struct ufs1_dinode), 0, 0, 0,
  263                   "lfsdinopl", &pool_allocator_nointr);
  264         pool_init(&lfs_inoext_pool, sizeof(struct lfs_inode_ext), 8, 0, 0,
  265                   "lfsinoextpl", &pool_allocator_nointr);
  266 #ifdef DEBUG
  267         memset(lfs_log, 0, sizeof(lfs_log));
  268 #endif
  269         simple_lock_init(&lfs_subsys_lock);
  270 }
  271 
  272 void
  273 lfs_reinit()
  274 {
  275         ufs_reinit();
  276 }
  277 
  278 void
  279 lfs_done()
  280 {
  281         ufs_done();
  282         pool_destroy(&lfs_inode_pool);
  283         pool_destroy(&lfs_dinode_pool);
  284         pool_destroy(&lfs_inoext_pool);
  285 #ifdef _LKM
  286         malloc_type_detach(M_SEGMENT);
  287 #endif
  288 }
  289 
  290 /*
  291  * Called by main() when ufs is going to be mounted as root.
  292  */
  293 int
  294 lfs_mountroot()
  295 {
  296         extern struct vnode *rootvp;
  297         struct mount *mp;
  298         struct proc *p = curproc;       /* XXX */
  299         int error;
  300         
  301         if (root_device->dv_class != DV_DISK)
  302                 return (ENODEV);
  303 
  304         if (rootdev == NODEV)
  305                 return (ENODEV);
  306         /*
  307          * Get vnodes for swapdev and rootdev.
  308          */
  309         if ((error = bdevvp(rootdev, &rootvp))) {
  310                 printf("lfs_mountroot: can't setup bdevvp's");
  311                 return (error);
  312         }
  313         if ((error = vfs_rootmountalloc(MOUNT_LFS, "root_device", &mp))) {
  314                 vrele(rootvp);
  315                 return (error);
  316         }
  317         if ((error = lfs_mountfs(rootvp, mp, p))) {
  318                 mp->mnt_op->vfs_refcount--;
  319                 vfs_unbusy(mp);
  320                 free(mp, M_MOUNT);
  321                 vrele(rootvp);
  322                 return (error);
  323         }
  324         simple_lock(&mountlist_slock);
  325         CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
  326         simple_unlock(&mountlist_slock);
  327         (void)lfs_statfs(mp, &mp->mnt_stat, p);
  328         vfs_unbusy(mp);
  329         inittodr(VFSTOUFS(mp)->um_lfs->lfs_tstamp);
  330         return (0);
  331 }
  332 
  333 /*
  334  * VFS Operations.
  335  *
  336  * mount system call
  337  */
  338 int
  339 lfs_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp, struct proc *p)
  340 {
  341         struct vnode *devvp;
  342         struct ufs_args args;
  343         struct ufsmount *ump = NULL;
  344         struct lfs *fs = NULL;                          /* LFS */
  345         int error;
  346         mode_t accessmode;
  347 
  348         if (mp->mnt_flag & MNT_GETARGS) {
  349                 ump = VFSTOUFS(mp);
  350                 if (ump == NULL)
  351                         return EIO;
  352                 args.fspec = NULL;
  353                 vfs_showexport(mp, &args.export, &ump->um_export);
  354                 return copyout(&args, data, sizeof(args));
  355         }
  356         error = copyin(data, &args, sizeof (struct ufs_args));
  357         if (error)
  358                 return (error);
  359 
  360         /*
  361          * If updating, check whether changing from read-only to
  362          * read/write; if there is no device name, that's all we do.
  363          */
  364         if (mp->mnt_flag & MNT_UPDATE) {
  365                 ump = VFSTOUFS(mp);
  366                 fs = ump->um_lfs;
  367                 if (fs->lfs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) {
  368                         /*
  369                          * If upgrade to read-write by non-root, then verify
  370                          * that user has necessary permissions on the device.
  371                          */
  372                         if (p->p_ucred->cr_uid != 0) {
  373                                 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
  374                                 error = VOP_ACCESS(ump->um_devvp, VREAD|VWRITE,
  375                                                    p->p_ucred, p);
  376                                 VOP_UNLOCK(ump->um_devvp, 0);
  377                                 if (error)
  378                                         return (error);
  379                         }
  380                         fs->lfs_ronly = 0;
  381                 }
  382                 if (args.fspec == 0) {
  383                         /*
  384                          * Process export requests.
  385                          */
  386                         return (vfs_export(mp, &ump->um_export, &args.export));
  387                 }
  388         }
  389         /*
  390          * Not an update, or updating the name: look up the name
  391          * and verify that it refers to a sensible block device.
  392          */
  393         NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
  394         if ((error = namei(ndp)) != 0)
  395                 return (error);
  396         devvp = ndp->ni_vp;
  397         if (devvp->v_type != VBLK) {
  398                 vrele(devvp);
  399                 return (ENOTBLK);
  400         }
  401         if (bdevsw_lookup(devvp->v_rdev) == NULL) {
  402                 vrele(devvp);
  403                 return (ENXIO);
  404         }
  405         /*
  406          * If mount by non-root, then verify that user has necessary
  407          * permissions on the device.
  408          */
  409         if (p->p_ucred->cr_uid != 0) {
  410                 accessmode = VREAD;
  411                 if ((mp->mnt_flag & MNT_RDONLY) == 0)
  412                         accessmode |= VWRITE;
  413                 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
  414                 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
  415                 if (error) {
  416                         vput(devvp);
  417                         return (error);
  418                 }
  419                 VOP_UNLOCK(devvp, 0);
  420         }
  421         if ((mp->mnt_flag & MNT_UPDATE) == 0)
  422                 error = lfs_mountfs(devvp, mp, p);              /* LFS */
  423         else {
  424                 if (devvp != ump->um_devvp)
  425                         error = EINVAL; /* needs translation */
  426                 else
  427                         vrele(devvp);
  428         }
  429         if (error) {
  430                 vrele(devvp);
  431                 return (error);
  432         }
  433         ump = VFSTOUFS(mp);
  434         fs = ump->um_lfs;                                       /* LFS */
  435         return set_statfs_info(path, UIO_USERSPACE, args.fspec,
  436             UIO_USERSPACE, mp, p);
  437 }
  438 
  439 /*
  440  * Roll-forward code.
  441  */
  442 
  443 /*
  444  * Load the appropriate indirect block, and change the appropriate pointer.
  445  * Mark the block dirty.  Do segment and avail accounting.
  446  */
  447 static int
  448 update_meta(struct lfs *fs, ino_t ino, int version, daddr_t lbn,
  449             daddr_t ndaddr, size_t size, struct proc *p)
  450 {
  451         int error;
  452         struct vnode *vp;
  453         struct inode *ip;
  454 #ifdef DEBUG_LFS_RFW
  455         daddr_t odaddr;
  456         struct indir a[NIADDR];
  457         int num;
  458         int i;
  459 #endif /* DEBUG_LFS_RFW */
  460         struct buf *bp;
  461         SEGUSE *sup;
  462 
  463         KASSERT(lbn >= 0);      /* no indirect blocks */
  464 
  465         if ((error = lfs_rf_valloc(fs, ino, version, p, &vp)) != 0) {
  466 #ifdef DEBUG_LFS_RFW
  467                 printf("update_meta: ino %d: lfs_rf_valloc returned %d\n", ino,
  468                        error);
  469 #endif /* DEBUG_LFS_RFW */
  470                 return error;
  471         }
  472 
  473         if ((error = VOP_BALLOC(vp, (lbn << fs->lfs_bshift), size,
  474                                 NOCRED, 0, &bp)) != 0) {
  475                 vput(vp);
  476                 return (error);
  477         }
  478         /* No need to write, the block is already on disk */
  479         if (bp->b_flags & B_DELWRI) {
  480                 LFS_UNLOCK_BUF(bp);
  481                 fs->lfs_avail += btofsb(fs, bp->b_bcount);
  482         }
  483         bp->b_flags |= B_INVAL;
  484         brelse(bp);
  485 
  486         /*
  487          * Extend the file, if it is not large enough already.
  488          * XXX this is not exactly right, we don't know how much of the
  489          * XXX last block is actually used.  We hope that an inode will
  490          * XXX appear later to give the correct size.
  491          */
  492         ip = VTOI(vp);
  493         if (ip->i_size <= (lbn << fs->lfs_bshift)) {
  494                 u_int64_t newsize;
  495 
  496                 if (lbn < NDADDR)
  497                         newsize = ip->i_ffs1_size = (lbn << fs->lfs_bshift) +
  498                                 (size - fs->lfs_fsize) + 1;
  499                 else
  500                         newsize = ip->i_ffs1_size = (lbn << fs->lfs_bshift) + 1;
  501 
  502                 if (ip->i_size < newsize) {
  503                         ip->i_size = newsize;
  504                         /*
  505                          * tell vm our new size for the case the inode won't
  506                          * appear later.
  507                          */
  508                         uvm_vnp_setsize(vp, newsize);
  509                 }
  510         }
  511 
  512         lfs_update_single(fs, NULL, vp, lbn, ndaddr, size);
  513 
  514         LFS_SEGENTRY(sup, fs, dtosn(fs, ndaddr), bp);
  515         sup->su_nbytes += size;
  516         LFS_WRITESEGENTRY(sup, fs, dtosn(fs, ndaddr), bp);
  517 
  518         /* differences here should be due to UNWRITTEN indirect blocks. */
  519         KASSERT((lblkno(fs, ip->i_size) > NDADDR &&
  520             ip->i_lfs_effnblks == ip->i_ffs1_blocks) ||
  521             ip->i_lfs_effnblks >= ip->i_ffs1_blocks);
  522 
  523 #ifdef DEBUG_LFS_RFW
  524         /* Now look again to make sure it worked */
  525         ufs_bmaparray(vp, lbn, &odaddr, &a[0], &num, NULL, NULL);
  526         for (i = num; i > 0; i--) {
  527                 if (!a[i].in_exists)
  528                         panic("update_meta: absent %d lv indirect block", i);
  529         }
  530         if (dbtofsb(fs, odaddr) != ndaddr)
  531                 printf("update_meta: failed setting ino %d lbn %" PRId64
  532                     " to %" PRId64 "\n", ino, lbn, ndaddr);
  533 #endif /* DEBUG_LFS_RFW */
  534         vput(vp);
  535         return 0;
  536 }
  537 
  538 static int
  539 update_inoblk(struct lfs *fs, daddr_t offset, struct ucred *cred,
  540               struct proc *p)
  541 {
  542         struct vnode *devvp, *vp;
  543         struct inode *ip;
  544         struct ufs1_dinode *dip;
  545         struct buf *dbp, *ibp;
  546         int error;
  547         daddr_t daddr;
  548         IFILE *ifp;
  549         SEGUSE *sup;
  550 
  551         devvp = VTOI(fs->lfs_ivnode)->i_devvp;
  552 
  553         /*
  554          * Get the inode, update times and perms.
  555          * DO NOT update disk blocks, we do that separately.
  556          */
  557         error = bread(devvp, fsbtodb(fs, offset), fs->lfs_ibsize, cred, &dbp);
  558         if (error) {
  559 #ifdef DEBUG_LFS_RFW
  560                 printf("update_inoblk: bread returned %d\n", error);
  561 #endif
  562                 return error;
  563         }
  564         dip = ((struct ufs1_dinode *)(dbp->b_data)) + INOPB(fs);
  565         while (--dip >= (struct ufs1_dinode *)dbp->b_data) {
  566                 if (dip->di_inumber > LFS_IFILE_INUM) {
  567                         /* printf("ino %d version %d\n", dip->di_inumber,
  568                                dip->di_gen); */
  569                         error = lfs_rf_valloc(fs, dip->di_inumber, dip->di_gen,
  570                                               p, &vp);
  571                         if (error) {
  572 #ifdef DEBUG_LFS_RFW
  573                                 printf("update_inoblk: lfs_rf_valloc returned %d\n", error);
  574 #endif
  575                                 continue;
  576                         }
  577                         ip = VTOI(vp);
  578                         if (dip->di_size != ip->i_size)
  579                                 VOP_TRUNCATE(vp, dip->di_size, 0, NOCRED, p);
  580                         /* Get mode, link count, size, and times */
  581                         memcpy(ip->i_din.ffs1_din, dip, 
  582                                offsetof(struct ufs1_dinode, di_db[0]));
  583 
  584                         /* Then the rest, except di_blocks */
  585                         ip->i_flags = ip->i_ffs1_flags = dip->di_flags;
  586                         ip->i_gen = ip->i_ffs1_gen = dip->di_gen;
  587                         ip->i_uid = ip->i_ffs1_uid = dip->di_uid;
  588                         ip->i_gid = ip->i_ffs1_gid = dip->di_gid;
  589 
  590                         ip->i_mode = ip->i_ffs1_mode;
  591                         ip->i_nlink = ip->i_ffs_effnlink = ip->i_ffs1_nlink;
  592                         ip->i_size = ip->i_ffs1_size;
  593 
  594                         LFS_SET_UINO(ip, IN_CHANGE | IN_MODIFIED | IN_UPDATE);
  595 
  596                         /* Re-initialize to get type right */
  597                         ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p,
  598                                   &vp);
  599                         vput(vp);
  600 
  601                         /* Record change in location */
  602                         LFS_IENTRY(ifp, fs, dip->di_inumber, ibp);
  603                         daddr = ifp->if_daddr;
  604                         ifp->if_daddr = dbtofsb(fs, dbp->b_blkno);
  605                         error = LFS_BWRITE_LOG(ibp); /* Ifile */
  606                         /* And do segment accounting */
  607                         if (dtosn(fs, daddr) != dtosn(fs, dbtofsb(fs, dbp->b_blkno))) {
  608                                 if (daddr > 0) {
  609                                         LFS_SEGENTRY(sup, fs, dtosn(fs, daddr),
  610                                                      ibp);
  611                                         sup->su_nbytes -= sizeof (struct ufs1_dinode);
  612                                         LFS_WRITESEGENTRY(sup, fs,
  613                                                           dtosn(fs, daddr),
  614                                                           ibp);
  615                                 }
  616                                 LFS_SEGENTRY(sup, fs, dtosn(fs, dbtofsb(fs, dbp->b_blkno)),
  617                                              ibp);
  618                                 sup->su_nbytes += sizeof (struct ufs1_dinode);
  619                                 LFS_WRITESEGENTRY(sup, fs,
  620                                                   dtosn(fs, dbtofsb(fs, dbp->b_blkno)),
  621                                                   ibp);
  622                         }
  623                 }
  624         }
  625         dbp->b_flags |= B_AGE;
  626         brelse(dbp);
  627 
  628         return 0;
  629 }
  630 
  631 #define CHECK_CKSUM   0x0001  /* Check the checksum to make sure it's valid */
  632 #define CHECK_UPDATE  0x0002  /* Update Ifile for new data blocks / inodes */
  633 
  634 static daddr_t
  635 check_segsum(struct lfs *fs, daddr_t offset, u_int64_t nextserial,
  636              struct ucred *cred, int flags, int *pseg_flags, struct proc *p)
  637 {
  638         struct vnode *devvp;
  639         struct buf *bp, *dbp;
  640         int error, nblocks = 0, ninos, i, j; /* XXX: gcc */
  641         SEGSUM *ssp;
  642         u_long *dp = NULL, *datap = NULL; /* XXX u_int32_t */
  643         daddr_t oldoffset;
  644         int32_t *iaddr; /* XXX ondisk32 */
  645         FINFO *fip;
  646         SEGUSE *sup;
  647         size_t size;
  648 
  649         devvp = VTOI(fs->lfs_ivnode)->i_devvp;
  650         /*
  651          * If the segment has a superblock and we're at the top
  652          * of the segment, skip the superblock.
  653          */
  654         if (sntod(fs, dtosn(fs, offset)) == offset) {
  655                 LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp); 
  656                 if (sup->su_flags & SEGUSE_SUPERBLOCK)
  657                         offset += btofsb(fs, LFS_SBPAD);
  658                 brelse(bp);
  659         }
  660 
  661         /* Read in the segment summary */
  662         error = bread(devvp, fsbtodb(fs, offset), fs->lfs_sumsize, cred, &bp);
  663         if (error)
  664                 return -1;
  665         
  666         /* Check summary checksum */
  667         ssp = (SEGSUM *)bp->b_data;
  668         if (flags & CHECK_CKSUM) {
  669                 if (ssp->ss_sumsum != cksum(&ssp->ss_datasum,
  670                                            fs->lfs_sumsize -
  671                                            sizeof(ssp->ss_sumsum))) {
  672 #ifdef DEBUG_LFS_RFW
  673                         printf("Sumsum error at 0x%" PRIx64 "\n", offset);
  674 #endif
  675                         offset = -1;
  676                         goto err1;
  677                 }
  678                 if (ssp->ss_nfinfo == 0 && ssp->ss_ninos == 0) {
  679 #ifdef DEBUG_LFS_RFW
  680                         printf("Empty pseg at 0x%" PRIx64 "\n", offset);
  681 #endif
  682                         offset = -1;
  683                         goto err1;
  684                 }
  685                 if (ssp->ss_create < fs->lfs_tstamp) {
  686 #ifdef DEBUG_LFS_RFW
  687                         printf("Old data at 0x%" PRIx64 "\n", offset);
  688 #endif
  689                         offset = -1;
  690                         goto err1;
  691                 }
  692         }
  693         if (fs->lfs_version > 1) {
  694                 if (ssp->ss_serial != nextserial) {
  695 #ifdef DEBUG_LFS_RFW
  696                         printf("Unexpected serial number at 0x%" PRIx64
  697                             "\n", offset);
  698 #endif
  699                         offset = -1;
  700                         goto err1;
  701                 }
  702                 if (ssp->ss_ident != fs->lfs_ident) {
  703 #ifdef DEBUG_LFS_RFW
  704                         printf("Incorrect fsid (0x%x vs 0x%x) at 0x%"
  705                             PRIx64 "\n", ssp->ss_ident, fs->lfs_ident, offset);
  706 #endif
  707                         offset = -1;
  708                         goto err1;
  709                 }
  710         }
  711         if (pseg_flags)
  712                 *pseg_flags = ssp->ss_flags;
  713         oldoffset = offset;
  714         offset += btofsb(fs, fs->lfs_sumsize);
  715 
  716         ninos = howmany(ssp->ss_ninos, INOPB(fs));
  717         /* XXX ondisk32 */
  718         iaddr = (int32_t *)(bp->b_data + fs->lfs_sumsize - sizeof(int32_t));
  719         if (flags & CHECK_CKSUM) {
  720                 /* Count blocks */
  721                 nblocks = 0;
  722                 fip = (FINFO *)(bp->b_data + SEGSUM_SIZE(fs));
  723                 for (i = 0; i < ssp->ss_nfinfo; ++i) {
  724                         nblocks += fip->fi_nblocks;
  725                         if (fip->fi_nblocks <= 0)
  726                                 break;
  727                         /* XXX ondisk32 */
  728                         fip = (FINFO *)(((char *)fip) + FINFOSIZE +
  729                                         (fip->fi_nblocks * sizeof(int32_t)));
  730                 }
  731                 nblocks += ninos;
  732                 /* Create the sum array */
  733                 datap = dp = (u_long *)malloc(nblocks * sizeof(u_long),
  734                                               M_SEGMENT, M_WAITOK);
  735         }
  736 
  737         /* Handle individual blocks */
  738         fip = (FINFO *)(bp->b_data + SEGSUM_SIZE(fs));
  739         for (i = 0; i < ssp->ss_nfinfo || ninos; ++i) {
  740                 /* Inode block? */
  741                 if (ninos && *iaddr == offset) {
  742                         if (flags & CHECK_CKSUM) {
  743                                 /* Read in the head and add to the buffer */
  744                                 error = bread(devvp, fsbtodb(fs, offset), fs->lfs_bsize,
  745                                               cred, &dbp);
  746                                 if (error) {
  747                                         offset = -1;
  748                                         goto err2;
  749                                 }
  750                                 (*dp++) = ((u_long *)(dbp->b_data))[0];
  751                                 dbp->b_flags |= B_AGE;
  752                                 brelse(dbp);
  753                         }
  754                         if (flags & CHECK_UPDATE) {
  755                                 if ((error = update_inoblk(fs, offset, cred, p))
  756                                     != 0) {
  757                                         offset = -1;
  758                                         goto err2;
  759                                 }
  760                         }
  761                         offset += btofsb(fs, fs->lfs_ibsize);
  762                         --iaddr;
  763                         --ninos;
  764                         --i; /* compensate */
  765                         continue;
  766                 }
  767                 /* printf("check: blocks from ino %d version %d\n",
  768                        fip->fi_ino, fip->fi_version); */
  769                 size = fs->lfs_bsize;
  770                 for (j = 0; j < fip->fi_nblocks; ++j) {
  771                         if (j == fip->fi_nblocks - 1)
  772                                 size = fip->fi_lastlength;
  773                         if (flags & CHECK_CKSUM) {
  774                                 error = bread(devvp, fsbtodb(fs, offset), size, cred, &dbp);
  775                                 if (error) {
  776                                         offset = -1;
  777                                         goto err2;
  778                                 }
  779                                 (*dp++) = ((u_long *)(dbp->b_data))[0];
  780                                 dbp->b_flags |= B_AGE;
  781                                 brelse(dbp);
  782                         }
  783                         /* Account for and update any direct blocks */
  784                         if ((flags & CHECK_UPDATE) &&
  785                            fip->fi_ino > LFS_IFILE_INUM &&
  786                            fip->fi_blocks[j] >= 0) {
  787                                 update_meta(fs, fip->fi_ino, fip->fi_version,
  788                                             fip->fi_blocks[j], offset, size, p);
  789                         }
  790                         offset += btofsb(fs, size);
  791                 }
  792                 /* XXX ondisk32 */
  793                 fip = (FINFO *)(((char *)fip) + FINFOSIZE
  794                                 + fip->fi_nblocks * sizeof(int32_t));
  795         }
  796         /* Checksum the array, compare */
  797         if ((flags & CHECK_CKSUM) &&
  798            ssp->ss_datasum != cksum(datap, nblocks * sizeof(u_long)))
  799         {
  800 #ifdef DEBUG_LFS_RFW
  801                 printf("Datasum error at 0x%" PRIx64 " (wanted %x got %x)\n",
  802                     offset, ssp->ss_datasum, cksum(datap, nblocks *
  803                                               sizeof(u_long)));
  804 #endif
  805                 offset = -1;
  806                 goto err2;
  807         }
  808 
  809         /* If we're at the end of the segment, move to the next */
  810         if (dtosn(fs, offset + btofsb(fs, fs->lfs_sumsize + fs->lfs_bsize)) !=
  811            dtosn(fs, offset)) {
  812                 if (dtosn(fs, offset) == dtosn(fs, ssp->ss_next)) {
  813                         offset = -1;
  814                         goto err2;
  815                 }
  816                 offset = ssp->ss_next;
  817 #ifdef DEBUG_LFS_RFW
  818                 printf("LFS roll forward: moving on to offset 0x%" PRIx64
  819                        " -> segment %d\n", offset, dtosn(fs,offset));
  820 #endif
  821         }
  822 
  823         if (flags & CHECK_UPDATE) {
  824                 fs->lfs_avail -= (offset - oldoffset);
  825                 /* Don't clog the buffer queue */
  826                 simple_lock(&lfs_subsys_lock);
  827                 if (locked_queue_count > LFS_MAX_BUFS ||
  828                     locked_queue_bytes > LFS_MAX_BYTES) {
  829                         lfs_flush(fs, SEGM_CKP);
  830                 }
  831                 simple_unlock(&lfs_subsys_lock);
  832         }
  833 
  834     err2:
  835         if (flags & CHECK_CKSUM)
  836                 free(datap, M_SEGMENT);
  837     err1:
  838         bp->b_flags |= B_AGE;
  839         brelse(bp);
  840 
  841         /* XXX should we update the serial number even for bad psegs? */
  842         if ((flags & CHECK_UPDATE) && offset > 0 && fs->lfs_version > 1)
  843                 fs->lfs_serial = nextserial;
  844         return offset;
  845 }
  846 
  847 /*
  848  * Common code for mount and mountroot
  849  * LFS specific
  850  */
  851 int
  852 lfs_mountfs(struct vnode *devvp, struct mount *mp, struct proc *p)
  853 {
  854         extern struct vnode *rootvp;
  855         struct dlfs *tdfs, *dfs, *adfs;
  856         struct lfs *fs;
  857         struct ufsmount *ump;
  858         struct vnode *vp;
  859         struct buf *bp, *abp;
  860         struct partinfo dpart;
  861         dev_t dev;
  862         int error, i, ronly, secsize, fsbsize;
  863         struct ucred *cred;
  864         CLEANERINFO *cip;
  865         SEGUSE *sup;
  866         int flags, dirty, do_rollforward;
  867         daddr_t offset, oldoffset, lastgoodpseg, sb_addr;
  868         int sn, curseg;
  869 
  870         cred = p ? p->p_ucred : NOCRED;
  871         /*
  872          * Disallow multiple mounts of the same device.
  873          * Disallow mounting of a device that is currently in use
  874          * (except for root, which might share swap device for miniroot).
  875          * Flush out any old buffers remaining from a previous use.
  876          */
  877         if ((error = vfs_mountedon(devvp)) != 0)
  878                 return (error);
  879         if (vcount(devvp) > 1 && devvp != rootvp)
  880                 return (EBUSY);
  881         if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0)
  882                 return (error);
  883 
  884         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  885         error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
  886         if (error)
  887                 return (error);
  888         if (VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred, p) != 0)
  889                 secsize = DEV_BSIZE;
  890         else
  891                 secsize = dpart.disklab->d_secsize;
  892 
  893         /* Don't free random space on error. */
  894         bp = NULL;
  895         abp = NULL;
  896         ump = NULL;
  897 
  898         sb_addr = LFS_LABELPAD / secsize;
  899         while (1) {
  900                 /* Read in the superblock. */
  901                 error = bread(devvp, sb_addr, LFS_SBPAD, cred, &bp);
  902                 if (error)
  903                         goto out;
  904                 dfs = (struct dlfs *)bp->b_data;
  905 
  906                 /* Check the basics. */
  907                 if (dfs->dlfs_magic != LFS_MAGIC || dfs->dlfs_bsize >= MAXBSIZE ||
  908                     dfs->dlfs_version > LFS_VERSION ||
  909                     dfs->dlfs_bsize < sizeof(struct dlfs)) {
  910 #ifdef DEBUG_LFS
  911                         printf("lfs_mountfs: primary superblock sanity failed\n");
  912 #endif
  913                         error = EINVAL;         /* XXX needs translation */
  914                         goto out;
  915                 }
  916                 if (dfs->dlfs_inodefmt > LFS_MAXINODEFMT)
  917                         printf("lfs_mountfs: warning: unknown inode format %d\n",
  918                                dfs->dlfs_inodefmt);
  919         
  920                 if (dfs->dlfs_version == 1) 
  921                         fsbsize = secsize;
  922                 else {
  923                         fsbsize = 1 << (dfs->dlfs_bshift - dfs->dlfs_blktodb + 
  924                                 dfs->dlfs_fsbtodb);
  925                         /*
  926                          * Could be, if the frag size is large enough, that we
  927                          * don't have the "real" primary superblock.  If that's
  928                          * the case, get the real one, and try again.
  929                          */
  930                         if (sb_addr != dfs->dlfs_sboffs[0] <<
  931                                        dfs->dlfs_fsbtodb) {
  932 /* #ifdef DEBUG_LFS */
  933                                 printf("lfs_mountfs: sb daddr 0x%llx is not right, trying 0x%llx\n",
  934                                         (long long)sb_addr, (long long)(dfs->dlfs_sboffs[0] <<
  935                                                  dfs->dlfs_fsbtodb));
  936 /* #endif */
  937                                 sb_addr = dfs->dlfs_sboffs[0] << 
  938                                           dfs->dlfs_fsbtodb;
  939                                 brelse(bp);
  940                                 continue;
  941                         }
  942                 }
  943                 break;
  944         }
  945 
  946         /*
  947          * Check the second superblock to see which is newer; then mount
  948          * using the older of the two.  This is necessary to ensure that
  949          * the filesystem is valid if it was not unmounted cleanly.
  950          */
  951 
  952         if (dfs->dlfs_sboffs[1] &&
  953             dfs->dlfs_sboffs[1] - LFS_LABELPAD / fsbsize > LFS_SBPAD / fsbsize)
  954         {
  955                 error = bread(devvp, dfs->dlfs_sboffs[1] * (fsbsize / secsize), 
  956                         LFS_SBPAD, cred, &abp);
  957                 if (error)
  958                         goto out;
  959                 adfs = (struct dlfs *)abp->b_data;
  960 
  961                 if (dfs->dlfs_version == 1) {
  962                         /* 1s resolution comparison */
  963                         if (adfs->dlfs_tstamp < dfs->dlfs_tstamp)
  964                                 tdfs = adfs;
  965                         else
  966                                 tdfs = dfs;
  967                 } else {
  968                         /* monotonic infinite-resolution comparison */
  969                         if (adfs->dlfs_serial < dfs->dlfs_serial)
  970                                 tdfs = adfs;
  971                         else
  972                                 tdfs = dfs;
  973                 }
  974 
  975                 /* Check the basics. */
  976                 if (tdfs->dlfs_magic != LFS_MAGIC ||
  977                     tdfs->dlfs_bsize > MAXBSIZE ||
  978                     tdfs->dlfs_version > LFS_VERSION ||
  979                     tdfs->dlfs_bsize < sizeof(struct dlfs)) {
  980 #ifdef DEBUG_LFS
  981                         printf("lfs_mountfs: alt superblock sanity failed\n");
  982 #endif
  983                         error = EINVAL;         /* XXX needs translation */
  984                         goto out;
  985                 }
  986         } else {
  987 #ifdef DEBUG_LFS
  988                 printf("lfs_mountfs: invalid alt superblock daddr=0x%x\n",
  989                         dfs->dlfs_sboffs[1]);
  990 #endif
  991                 error = EINVAL;
  992                 goto out;
  993         }
  994 
  995         /* Allocate the mount structure, copy the superblock into it. */
  996         fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK | M_ZERO);
  997         memcpy(&fs->lfs_dlfs, tdfs, sizeof(struct dlfs));
  998 
  999         /* Compatibility */
 1000         if (fs->lfs_version < 2) {
 1001                 fs->lfs_sumsize = LFS_V1_SUMMARY_SIZE;
 1002                 fs->lfs_ibsize = fs->lfs_bsize;
 1003                 fs->lfs_start = fs->lfs_sboffs[0];
 1004                 fs->lfs_tstamp = fs->lfs_otstamp;
 1005                 fs->lfs_fsbtodb = 0;
 1006         }
 1007 
 1008         /* Before rolling forward, lock so vget will sleep for other procs */
 1009         fs->lfs_flags = LFS_NOTYET;
 1010         fs->lfs_rfpid = p->p_pid;
 1011 
 1012         ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO);
 1013         ump->um_lfs = fs;
 1014         ump->um_fstype = UFS1;
 1015         if (sizeof(struct lfs) < LFS_SBPAD) {                   /* XXX why? */
 1016                 bp->b_flags |= B_INVAL;
 1017                 abp->b_flags |= B_INVAL;
 1018         }
 1019         brelse(bp);
 1020         bp = NULL;
 1021         brelse(abp);
 1022         abp = NULL;
 1023 
 1024         /* Set up the I/O information */
 1025         fs->lfs_devbsize = secsize;
 1026         fs->lfs_iocount = 0;
 1027         fs->lfs_diropwait = 0;
 1028         fs->lfs_activesb = 0;
 1029         fs->lfs_uinodes = 0;
 1030         fs->lfs_ravail = 0;
 1031         fs->lfs_sbactive = 0;
 1032 
 1033         /* Set up the ifile and lock aflags */
 1034         fs->lfs_doifile = 0;
 1035         fs->lfs_writer = 0;
 1036         fs->lfs_dirops = 0;
 1037         fs->lfs_nadirop = 0;
 1038         fs->lfs_seglock = 0;
 1039         fs->lfs_pdflush = 0;
 1040         fs->lfs_sleepers = 0;
 1041         simple_lock_init(&fs->lfs_interlock);
 1042         lockinit(&fs->lfs_fraglock, PINOD, "lfs_fraglock", 0, 0);
 1043 
 1044         /* Set the file system readonly/modify bits. */
 1045         fs->lfs_ronly = ronly;
 1046         if (ronly == 0)
 1047                 fs->lfs_fmod = 1;
 1048 
 1049         /* Initialize the mount structure. */
 1050         dev = devvp->v_rdev;
 1051         mp->mnt_data = ump;
 1052         mp->mnt_stat.f_fsid.val[0] = (long)dev;
 1053         mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS);
 1054         mp->mnt_stat.f_iosize = fs->lfs_bsize;
 1055         mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen;
 1056         mp->mnt_flag |= MNT_LOCAL;
 1057         mp->mnt_fs_bshift = fs->lfs_bshift;
 1058         ump->um_flags = 0;
 1059         ump->um_mountp = mp;
 1060         ump->um_dev = dev;
 1061         ump->um_devvp = devvp;
 1062         ump->um_bptrtodb = fs->lfs_fsbtodb;
 1063         ump->um_seqinc = fragstofsb(fs, fs->lfs_frag);
 1064         ump->um_nindir = fs->lfs_nindir;
 1065         ump->um_lognindir = ffs(fs->lfs_nindir) - 1;
 1066         for (i = 0; i < MAXQUOTAS; i++)
 1067                 ump->um_quotas[i] = NULLVP;
 1068         devvp->v_specmountpoint = mp;
 1069 
 1070         /* Set up reserved memory for pageout */
 1071         lfs_setup_resblks(fs);
 1072         /* Set up vdirop tailq */
 1073         TAILQ_INIT(&fs->lfs_dchainhd);
 1074         /* and paging tailq */
 1075         TAILQ_INIT(&fs->lfs_pchainhd);
 1076 
 1077         /*
 1078          * We use the ifile vnode for almost every operation.  Instead of
 1079          * retrieving it from the hash table each time we retrieve it here,
 1080          * artificially increment the reference count and keep a pointer
 1081          * to it in the incore copy of the superblock.
 1082          */
 1083         if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) {
 1084 #ifdef DEBUG
 1085                 printf("lfs_mountfs: ifile vget failed, error=%d\n", error);
 1086 #endif
 1087                 goto out;
 1088         }
 1089         fs->lfs_ivnode = vp;
 1090         VREF(vp);
 1091 
 1092         /* Set up segment usage flags for the autocleaner. */
 1093         fs->lfs_nactive = 0;
 1094         fs->lfs_suflags = (u_int32_t **)malloc(2 * sizeof(u_int32_t *),
 1095                                                 M_SEGMENT, M_WAITOK);
 1096         fs->lfs_suflags[0] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t),
 1097                                                  M_SEGMENT, M_WAITOK);
 1098         fs->lfs_suflags[1] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t),
 1099                                                  M_SEGMENT, M_WAITOK);
 1100         memset(fs->lfs_suflags[1], 0, fs->lfs_nseg * sizeof(u_int32_t));
 1101         for (i = 0; i < fs->lfs_nseg; i++) {
 1102                 int changed;
 1103 
 1104                 LFS_SEGENTRY(sup, fs, i, bp);
 1105                 changed = 0;
 1106                 if (!ronly) {
 1107                         if (sup->su_nbytes == 0 &&
 1108                             !(sup->su_flags & SEGUSE_EMPTY)) {
 1109                                 sup->su_flags |= SEGUSE_EMPTY;
 1110                                 ++changed;
 1111                         } else if (!(sup->su_nbytes == 0) &&
 1112                                    (sup->su_flags & SEGUSE_EMPTY)) {
 1113                                 sup->su_flags &= ~SEGUSE_EMPTY;
 1114                                 ++changed;
 1115                         }
 1116                         if (sup->su_flags & SEGUSE_ACTIVE) {
 1117                                 sup->su_flags &= ~SEGUSE_ACTIVE;
 1118                                 ++changed;
 1119                         }
 1120                 }
 1121                 fs->lfs_suflags[0][i] = sup->su_flags;
 1122                 if (changed)
 1123                         LFS_WRITESEGENTRY(sup, fs, i, bp);
 1124                 else
 1125                         brelse(bp);
 1126         }
 1127 
 1128         /*
 1129          * Roll forward.
 1130          *
 1131          * We don't automatically roll forward for v1 filesystems, because
 1132          * of the danger that the clock was turned back between the last
 1133          * checkpoint and crash.  This would roll forward garbage.
 1134          *
 1135          * v2 filesystems don't have this problem because they use a
 1136          * monotonically increasing serial number instead of a timestamp.
 1137          */
 1138 #ifdef LFS_DO_ROLLFORWARD
 1139         do_rollforward = !fs->lfs_ronly;
 1140 #else
 1141         do_rollforward = (fs->lfs_version > 1 && !fs->lfs_ronly &&
 1142                           !(fs->lfs_pflags & LFS_PF_CLEAN));
 1143 #endif
 1144         if (do_rollforward) {
 1145                 u_int64_t nextserial;
 1146                 /*
 1147                  * Phase I: Find the address of the last good partial
 1148                  * segment that was written after the checkpoint.  Mark
 1149                  * the segments in question dirty, so they won't be
 1150                  * reallocated.
 1151                  */
 1152                 lastgoodpseg = oldoffset = offset = fs->lfs_offset;
 1153                 flags = 0x0;
 1154 #ifdef DEBUG_LFS_RFW
 1155                 printf("LFS roll forward phase 1: starting at offset 0x%"
 1156                     PRIx64 "\n", offset);
 1157 #endif
 1158                 LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp);
 1159                 if (!(sup->su_flags & SEGUSE_DIRTY))
 1160                         --fs->lfs_nclean;
 1161                 sup->su_flags |= SEGUSE_DIRTY;
 1162                 LFS_WRITESEGENTRY(sup, fs, dtosn(fs, offset), bp);
 1163                 nextserial = fs->lfs_serial + 1;
 1164                 while ((offset = check_segsum(fs, offset, nextserial,
 1165                     cred, CHECK_CKSUM, &flags, p)) > 0) {
 1166                         nextserial++;
 1167                         if (sntod(fs, oldoffset) != sntod(fs, offset)) {
 1168                                 LFS_SEGENTRY(sup, fs, dtosn(fs, oldoffset),
 1169                                              bp); 
 1170                                 if (!(sup->su_flags & SEGUSE_DIRTY))
 1171                                         --fs->lfs_nclean;
 1172                                 sup->su_flags |= SEGUSE_DIRTY;
 1173                                 LFS_WRITESEGENTRY(sup, fs, dtosn(fs, oldoffset),
 1174                                              bp); 
 1175                         }
 1176 
 1177 #ifdef DEBUG_LFS_RFW
 1178                         printf("LFS roll forward phase 1: offset=0x%"
 1179                             PRIx64 "\n", offset);
 1180                         if (flags & SS_DIROP) {
 1181                                 printf("lfs_mountfs: dirops at 0x%" PRIx64 "\n",
 1182                                        oldoffset);
 1183                                 if (!(flags & SS_CONT))
 1184                                         printf("lfs_mountfs: dirops end "
 1185                                                "at 0x%" PRIx64 "\n", oldoffset);
 1186                         }
 1187 #endif
 1188                         if (!(flags & SS_CONT))
 1189                                 lastgoodpseg = offset;
 1190                         oldoffset = offset;
 1191                 }
 1192 #ifdef DEBUG_LFS_RFW
 1193                 if (flags & SS_CONT) {
 1194                         printf("LFS roll forward: warning: incomplete "
 1195                                "dirops discarded\n");
 1196                 }
 1197                 printf("LFS roll forward phase 1: completed: "
 1198                        "lastgoodpseg=0x%" PRIx64 "\n", lastgoodpseg);
 1199 #endif
 1200                 oldoffset = fs->lfs_offset;
 1201                 if (fs->lfs_offset != lastgoodpseg) {
 1202                         /* Don't overwrite what we're trying to preserve */
 1203                         offset = fs->lfs_offset;
 1204                         fs->lfs_offset = lastgoodpseg;
 1205                         fs->lfs_curseg = sntod(fs, dtosn(fs, fs->lfs_offset));
 1206                         for (sn = curseg = dtosn(fs, fs->lfs_curseg);;) {
 1207                                 sn = (sn + 1) % fs->lfs_nseg;
 1208                                 if (sn == curseg)
 1209                                         panic("lfs_mountfs: no clean segments");
 1210                                 LFS_SEGENTRY(sup, fs, sn, bp);
 1211                                 dirty = (sup->su_flags & SEGUSE_DIRTY);
 1212                                 brelse(bp);
 1213                                 if (!dirty)
 1214                                         break;
 1215                         }
 1216                         fs->lfs_nextseg = sntod(fs, sn);
 1217 
 1218                         /*
 1219                          * Phase II: Roll forward from the first superblock.
 1220                          */
 1221                         while (offset != lastgoodpseg) {
 1222 #ifdef DEBUG_LFS_RFW
 1223                                 printf("LFS roll forward phase 2: 0x%"
 1224                                     PRIx64 "\n", offset);
 1225 #endif
 1226                                 offset = check_segsum(fs, offset,
 1227                                     fs->lfs_serial + 1, cred, CHECK_UPDATE,
 1228                                     NULL, p);
 1229                         }
 1230 
 1231                         /*
 1232                          * Finish: flush our changes to disk.
 1233                          */
 1234                         lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC);
 1235                         printf("lfs_mountfs: roll forward recovered %lld blocks\n",
 1236                                (long long)(lastgoodpseg - oldoffset));
 1237                 }
 1238 #ifdef DEBUG_LFS_RFW
 1239                 printf("LFS roll forward complete\n");
 1240 #endif
 1241         }
 1242         /* If writing, sb is not clean; record in case of immediate crash */
 1243         if (!fs->lfs_ronly) {
 1244                 fs->lfs_pflags &= ~LFS_PF_CLEAN;
 1245                 lfs_writesuper(fs, fs->lfs_sboffs[0]);
 1246                 lfs_writesuper(fs, fs->lfs_sboffs[1]);
 1247         }
 1248         
 1249         /* Allow vget now that roll-forward is complete */
 1250         fs->lfs_flags &= ~(LFS_NOTYET);
 1251         wakeup(&fs->lfs_flags);
 1252 
 1253         /*
 1254          * Initialize the ifile cleaner info with information from 
 1255          * the superblock.
 1256          */ 
 1257         LFS_CLEANERINFO(cip, fs, bp);
 1258         cip->clean = fs->lfs_nclean;
 1259         cip->dirty = fs->lfs_nseg - fs->lfs_nclean;
 1260         cip->avail = fs->lfs_avail;
 1261         cip->bfree = fs->lfs_bfree;
 1262         (void) LFS_BWRITE_LOG(bp); /* Ifile */
 1263 
 1264         /*
 1265          * Mark the current segment as ACTIVE, since we're going to 
 1266          * be writing to it.
 1267          */
 1268         LFS_SEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp); 
 1269         sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE;
 1270         fs->lfs_nactive++;
 1271         LFS_WRITESEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp);  /* Ifile */
 1272 
 1273         /* Now that roll-forward is done, unlock the Ifile */
 1274         vput(vp);
 1275 
 1276         /* Comment on ifile size if it is too large */
 1277         if (fs->lfs_ivnode->v_size / fs->lfs_bsize > LFS_MAX_BUFS) {
 1278                 fs->lfs_flags |= LFS_WARNED;
 1279                 printf("lfs_mountfs: please consider increasing NBUF to at least %lld\n",
 1280                         (long long)(fs->lfs_ivnode->v_size / fs->lfs_bsize) * (nbuf / LFS_MAX_BUFS));
 1281         }
 1282         if (fs->lfs_ivnode->v_size > LFS_MAX_BYTES) {
 1283                 fs->lfs_flags |= LFS_WARNED;
 1284                 printf("lfs_mountfs: please consider increasing BUFPAGES to at least %lld\n",
 1285                         (long long)(fs->lfs_ivnode->v_size * bufpages / LFS_MAX_BYTES));
 1286         }
 1287 
 1288         return (0);
 1289 out:
 1290         if (bp)
 1291                 brelse(bp);
 1292         if (abp)
 1293                 brelse(abp);
 1294         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 1295         (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p);
 1296         VOP_UNLOCK(devvp, 0);
 1297         if (ump) {
 1298                 free(ump->um_lfs, M_UFSMNT);
 1299                 free(ump, M_UFSMNT);
 1300                 mp->mnt_data = NULL;
 1301         }
 1302 
 1303         /* Start the pagedaemon-anticipating daemon */
 1304         if (lfs_writer_daemon == 0 &&
 1305             kthread_create1(lfs_writerd, NULL, NULL, "lfs_writer") != 0)
 1306                 panic("fork lfs_writer");
 1307 
 1308         return (error);
 1309 }
 1310 
 1311 /*
 1312  * unmount system call
 1313  */
 1314 int
 1315 lfs_unmount(struct mount *mp, int mntflags, struct proc *p)
 1316 {
 1317         struct ufsmount *ump;
 1318         struct lfs *fs;
 1319         int error, flags, ronly;
 1320         int s;
 1321 
 1322         flags = 0;
 1323         if (mntflags & MNT_FORCE)
 1324                 flags |= FORCECLOSE;
 1325 
 1326         ump = VFSTOUFS(mp);
 1327         fs = ump->um_lfs;
 1328 
 1329         /* wake up the cleaner so it can die */
 1330         wakeup(&fs->lfs_nextseg);
 1331         wakeup(&lfs_allclean_wakeup);
 1332         simple_lock(&fs->lfs_interlock);
 1333         while (fs->lfs_sleepers)
 1334                 ltsleep(&fs->lfs_sleepers, PRIBIO + 1, "lfs_sleepers", 0,
 1335                         &fs->lfs_interlock);
 1336         simple_unlock(&fs->lfs_interlock);
 1337 
 1338 #ifdef QUOTA
 1339         if (mp->mnt_flag & MNT_QUOTA) {
 1340                 int i;
 1341                 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags);
 1342                 if (error)
 1343                         return (error);
 1344                 for (i = 0; i < MAXQUOTAS; i++) {
 1345                         if (ump->um_quotas[i] == NULLVP)
 1346                                 continue;
 1347                         quotaoff(p, mp, i);
 1348                 }
 1349                 /*
 1350                  * Here we fall through to vflush again to ensure
 1351                  * that we have gotten rid of all the system vnodes.
 1352                  */
 1353         }
 1354 #endif
 1355         if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0)
 1356                 return (error);
 1357         if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0)
 1358                 return (error);
 1359         s = splbio();
 1360         if (LIST_FIRST(&fs->lfs_ivnode->v_dirtyblkhd))
 1361                 panic("lfs_unmount: still dirty blocks on ifile vnode");
 1362         splx(s);
 1363 
 1364         /* Comment on ifile size if it has become too large */
 1365         if (!(fs->lfs_flags & LFS_WARNED)) {
 1366                 if (fs->lfs_ivnode->v_size / fs->lfs_bsize > LFS_MAX_BUFS)
 1367                         printf("lfs_unmount: please consider increasing"
 1368                                 " NBUF to at least %lld\n",
 1369                                 (long long)(fs->lfs_ivnode->v_size /
 1370                                             fs->lfs_bsize) *
 1371                                 (long long)(nbuf / LFS_MAX_BUFS));
 1372                 if (fs->lfs_ivnode->v_size > LFS_MAX_BYTES)
 1373                         printf("lfs_unmount: please consider increasing"
 1374                                 " BUFPAGES to at least %lld\n",
 1375                                 (long long)(fs->lfs_ivnode->v_size *
 1376                                 bufpages / LFS_MAX_BYTES));
 1377         }
 1378 
 1379         /* Explicitly write the superblock, to update serial and pflags */
 1380         fs->lfs_pflags |= LFS_PF_CLEAN;
 1381         lfs_writesuper(fs, fs->lfs_sboffs[0]);
 1382         lfs_writesuper(fs, fs->lfs_sboffs[1]);
 1383         while (fs->lfs_iocount)
 1384                 tsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs_umount", 0);
 1385 
 1386         /* Finish with the Ifile, now that we're done with it */
 1387         vrele(fs->lfs_ivnode);
 1388         vgone(fs->lfs_ivnode);
 1389 
 1390         ronly = !fs->lfs_ronly;
 1391         if (ump->um_devvp->v_type != VBAD)
 1392                 ump->um_devvp->v_specmountpoint = NULL;
 1393         vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
 1394         error = VOP_CLOSE(ump->um_devvp,
 1395             ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
 1396         vput(ump->um_devvp);
 1397 
 1398         /* Free per-mount data structures */
 1399         free(fs->lfs_suflags[0], M_SEGMENT);
 1400         free(fs->lfs_suflags[1], M_SEGMENT);
 1401         free(fs->lfs_suflags, M_SEGMENT);
 1402         lfs_free_resblks(fs);
 1403         free(fs, M_UFSMNT);
 1404         free(ump, M_UFSMNT);
 1405 
 1406         mp->mnt_data = NULL;
 1407         mp->mnt_flag &= ~MNT_LOCAL;
 1408         return (error);
 1409 }
 1410 
 1411 /*
 1412  * Get file system statistics.
 1413  */
 1414 int
 1415 lfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
 1416 {
 1417         struct lfs *fs;
 1418         struct ufsmount *ump;
 1419 
 1420         ump = VFSTOUFS(mp);
 1421         fs = ump->um_lfs;
 1422         if (fs->lfs_magic != LFS_MAGIC)
 1423                 panic("lfs_statfs: magic");
 1424 
 1425         sbp->f_type = 0;
 1426         sbp->f_bsize = fs->lfs_fsize;
 1427         sbp->f_iosize = fs->lfs_bsize;
 1428         sbp->f_blocks = fsbtofrags(fs, LFS_EST_NONMETA(fs));
 1429         sbp->f_bfree = fsbtofrags(fs, LFS_EST_BFREE(fs));
 1430         sbp->f_bavail = fsbtofrags(fs, (long)LFS_EST_BFREE(fs) -
 1431                                   (long)LFS_EST_RSVD(fs));
 1432         
 1433         sbp->f_files = fs->lfs_bfree / btofsb(fs, fs->lfs_ibsize) * INOPB(fs);
 1434         sbp->f_ffree = sbp->f_files - fs->lfs_nfiles;
 1435         copy_statfs_info(sbp, mp);
 1436         return (0);
 1437 }
 1438 
 1439 /*
 1440  * Go through the disk queues to initiate sandbagged IO;
 1441  * go through the inodes to write those that have been modified;
 1442  * initiate the writing of the super block if it has been modified.
 1443  *
 1444  * Note: we are always called with the filesystem marked `MPBUSY'.
 1445  */
 1446 int
 1447 lfs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct proc *p)
 1448 {
 1449         int error;
 1450         struct lfs *fs;
 1451 
 1452         fs = VFSTOUFS(mp)->um_lfs;
 1453         if (fs->lfs_ronly)
 1454                 return 0;
 1455         lfs_writer_enter(fs, "lfs_dirops");
 1456 
 1457         /* All syncs must be checkpoints until roll-forward is implemented. */
 1458         error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0));
 1459         lfs_writer_leave(fs);
 1460 #ifdef QUOTA
 1461         qsync(mp);
 1462 #endif
 1463         return (error);
 1464 }
 1465 
 1466 extern struct lock ufs_hashlock;
 1467 
 1468 /*
 1469  * Look up an LFS dinode number to find its incore vnode.  If not already
 1470  * in core, read it in from the specified device.  Return the inode locked.
 1471  * Detection and handling of mount points must be done by the calling routine.
 1472  */
 1473 int
 1474 lfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 1475 {
 1476         struct lfs *fs;
 1477         struct ufs1_dinode *dip;
 1478         struct inode *ip;
 1479         struct buf *bp;
 1480         struct ifile *ifp;
 1481         struct vnode *vp;
 1482         struct ufsmount *ump;
 1483         daddr_t daddr;
 1484         dev_t dev;
 1485         int error, retries;
 1486         struct timespec ts;
 1487 
 1488         ump = VFSTOUFS(mp);
 1489         dev = ump->um_dev;
 1490         fs = ump->um_lfs;
 1491 
 1492         /*
 1493          * If the filesystem is not completely mounted yet, suspend
 1494          * any access requests (wait for roll-forward to complete).
 1495          */
 1496         while ((fs->lfs_flags & LFS_NOTYET) && curproc->p_pid != fs->lfs_rfpid)
 1497                 tsleep(&fs->lfs_flags, PRIBIO+1, "lfs_notyet", 0);
 1498 
 1499         if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL)
 1500                 return (0);
 1501 
 1502         if ((error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, &vp)) != 0) {
 1503                 *vpp = NULL;
 1504                  return (error);
 1505         }
 1506 
 1507         do {
 1508                 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) {
 1509                         ungetnewvnode(vp);
 1510                         return (0);
 1511                 }
 1512         } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0));
 1513 
 1514         /* Translate the inode number to a disk address. */
 1515         if (ino == LFS_IFILE_INUM)
 1516                 daddr = fs->lfs_idaddr;
 1517         else {
 1518                 /* XXX bounds-check this too */
 1519                 LFS_IENTRY(ifp, fs, ino, bp);
 1520                 daddr = ifp->if_daddr;
 1521                 if (fs->lfs_version > 1) {
 1522                         ts.tv_sec = ifp->if_atime_sec;
 1523                         ts.tv_nsec = ifp->if_atime_nsec;
 1524                 }
 1525 
 1526                 brelse(bp);
 1527                 if (daddr == LFS_UNUSED_DADDR) {
 1528                         *vpp = NULLVP;
 1529                         ungetnewvnode(vp);
 1530                         lockmgr(&ufs_hashlock, LK_RELEASE, 0);
 1531                         return (ENOENT);
 1532                 }
 1533         }
 1534 
 1535         /* Allocate/init new vnode/inode. */
 1536         lfs_vcreate(mp, ino, vp);
 1537 
 1538         /*
 1539          * Put it onto its hash chain and lock it so that other requests for
 1540          * this inode will block if they arrive while we are sleeping waiting
 1541          * for old data structures to be purged or for the contents of the
 1542          * disk portion of this inode to be read.
 1543          */
 1544         ip = VTOI(vp);
 1545         ufs_ihashins(ip);
 1546         lockmgr(&ufs_hashlock, LK_RELEASE, 0);
 1547 
 1548         /*
 1549          * XXX
 1550          * This may not need to be here, logically it should go down with
 1551          * the i_devvp initialization.
 1552          * Ask Kirk.
 1553          */
 1554         ip->i_lfs = ump->um_lfs;
 1555 
 1556         /* Read in the disk contents for the inode, copy into the inode. */
 1557         retries = 0;
 1558     again:
 1559         error = bread(ump->um_devvp, fsbtodb(fs, daddr), 
 1560                 (fs->lfs_version == 1 ? fs->lfs_bsize : fs->lfs_ibsize),
 1561                 NOCRED, &bp);
 1562         if (error) {
 1563                 /*
 1564                  * The inode does not contain anything useful, so it would
 1565                  * be misleading to leave it on its hash chain. With mode
 1566                  * still zero, it will be unlinked and returned to the free
 1567                  * list by vput().
 1568                  */
 1569                 vput(vp);
 1570                 brelse(bp);
 1571                 *vpp = NULL;
 1572                 return (error);
 1573         }
 1574 
 1575         dip = lfs_ifind(fs, ino, bp);
 1576         if (dip == NULL) {
 1577                 /* Assume write has not completed yet; try again */
 1578                 bp->b_flags |= B_INVAL;
 1579                 brelse(bp);
 1580                 ++retries;
 1581                 if (retries > LFS_IFIND_RETRIES) {
 1582 #ifdef DEBUG
 1583                         /* If the seglock is held look at the bpp to see
 1584                            what is there anyway */
 1585                         if (fs->lfs_seglock > 0) {
 1586                                 struct buf **bpp;
 1587                                 struct ufs1_dinode *dp;
 1588                                 int i;
 1589 
 1590                                 for (bpp = fs->lfs_sp->bpp;
 1591                                      bpp != fs->lfs_sp->cbpp; ++bpp) {
 1592                                         if ((*bpp)->b_vp == fs->lfs_ivnode &&
 1593                                             bpp != fs->lfs_sp->bpp) {
 1594                                                 /* Inode block */
 1595                                                 printf("block 0x%" PRIx64 ": ",
 1596                                                     (*bpp)->b_blkno);
 1597                                                 dp = (struct ufs1_dinode *)(*bpp)->b_data;
 1598                                                 for (i = 0; i < INOPB(fs); i++)
 1599                                                         if (dp[i].di_u.inumber)
 1600                                                                 printf("%d ", dp[i].di_u.inumber);
 1601                                                 printf("\n");
 1602                                         }
 1603                                 }
 1604                         }
 1605 #endif
 1606                         panic("lfs_vget: dinode not found");
 1607                 }
 1608                 printf("lfs_vget: dinode %d not found, retrying...\n", ino);
 1609                 (void)tsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs ifind", 1);
 1610                 goto again;
 1611         }
 1612         *ip->i_din.ffs1_din = *dip;
 1613         brelse(bp);
 1614 
 1615         if (fs->lfs_version > 1) {
 1616                 ip->i_ffs1_atime = ts.tv_sec;
 1617                 ip->i_ffs1_atimensec = ts.tv_nsec;
 1618         }
 1619 
 1620         lfs_vinit(mp, &vp);
 1621 
 1622         *vpp = vp;
 1623 
 1624         KASSERT(VOP_ISLOCKED(vp));
 1625 
 1626         return (0);
 1627 }
 1628 
 1629 /*
 1630  * File handle to vnode
 1631  */
 1632 int
 1633 lfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
 1634 {
 1635         struct lfid *lfhp;
 1636         struct buf *bp;
 1637         IFILE *ifp;
 1638         int32_t daddr;
 1639         struct lfs *fs;
 1640 
 1641         lfhp = (struct lfid *)fhp;
 1642         if (lfhp->lfid_ino < LFS_IFILE_INUM)
 1643                 return ESTALE;
 1644 
 1645         fs = VFSTOUFS(mp)->um_lfs;
 1646         if (lfhp->lfid_ident != fs->lfs_ident)
 1647                 return ESTALE;
 1648 
 1649         if (lfhp->lfid_ino >
 1650             ((VTOI(fs->lfs_ivnode)->i_ffs1_size >> fs->lfs_bshift) -
 1651              fs->lfs_cleansz - fs->lfs_segtabsz) * fs->lfs_ifpb)
 1652                 return ESTALE;
 1653 
 1654         if (ufs_ihashlookup(VFSTOUFS(mp)->um_dev, lfhp->lfid_ino) == NULLVP) {
 1655                 LFS_IENTRY(ifp, fs, lfhp->lfid_ino, bp);
 1656                 daddr = ifp->if_daddr;
 1657                 brelse(bp);
 1658                 if (daddr == LFS_UNUSED_DADDR)
 1659                         return ESTALE;
 1660         }
 1661 
 1662         return (ufs_fhtovp(mp, &lfhp->lfid_ufid, vpp));
 1663 }
 1664 
 1665 /*
 1666  * Vnode pointer to File handle
 1667  */
 1668 /* ARGSUSED */
 1669 int
 1670 lfs_vptofh(struct vnode *vp, struct fid *fhp)
 1671 {
 1672         struct inode *ip;
 1673         struct lfid *lfhp;
 1674 
 1675         ip = VTOI(vp);
 1676         lfhp = (struct lfid *)fhp;
 1677         lfhp->lfid_len = sizeof(struct lfid);
 1678         lfhp->lfid_ino = ip->i_number;
 1679         lfhp->lfid_gen = ip->i_gen;
 1680         lfhp->lfid_ident = ip->i_lfs->lfs_ident;
 1681         return (0);
 1682 }
 1683 
 1684 static int
 1685 sysctl_lfs_dostats(SYSCTLFN_ARGS)
 1686 {
 1687         extern struct lfs_stats lfs_stats;
 1688         extern int lfs_dostats;
 1689         int error;
 1690 
 1691         error = sysctl_lookup(SYSCTLFN_CALL(rnode));
 1692         if (error || newp == NULL)
 1693                 return (error);
 1694 
 1695         if (lfs_dostats == 0)
 1696                 memset(&lfs_stats,0,sizeof(lfs_stats));
 1697 
 1698         return (0);
 1699 }
 1700 
 1701 SYSCTL_SETUP(sysctl_vfs_lfs_setup, "sysctl vfs.lfs subtree setup")
 1702 {
 1703         extern int lfs_writeindir, lfs_dostats, lfs_clean_vnhead;
 1704 
 1705         sysctl_createv(clog, 0, NULL, NULL,
 1706                        CTLFLAG_PERMANENT,
 1707                        CTLTYPE_NODE, "vfs", NULL,
 1708                        NULL, 0, NULL, 0,
 1709                        CTL_VFS, CTL_EOL);
 1710         sysctl_createv(clog, 0, NULL, NULL,
 1711                        CTLFLAG_PERMANENT,
 1712                        CTLTYPE_NODE, "lfs",
 1713                        SYSCTL_DESCR("Log-structured file system"),
 1714                        NULL, 0, NULL, 0,
 1715                        CTL_VFS, 5, CTL_EOL);
 1716         /*
 1717          * XXX the "5" above could be dynamic, thereby eliminating one
 1718          * more instance of the "number to vfs" mapping problem, but
 1719          * "2" is the order as taken from sys/mount.h
 1720          */
 1721 
 1722         sysctl_createv(clog, 0, NULL, NULL,
 1723                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1724                        CTLTYPE_INT, "flushindir", NULL,
 1725                        NULL, 0, &lfs_writeindir, 0,
 1726                        CTL_VFS, 5, LFS_WRITEINDIR, CTL_EOL);
 1727         sysctl_createv(clog, 0, NULL, NULL,
 1728                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1729                        CTLTYPE_INT, "clean_vnhead", NULL,
 1730                        NULL, 0, &lfs_clean_vnhead, 0,
 1731                        CTL_VFS, 5, LFS_CLEAN_VNHEAD, CTL_EOL);
 1732         sysctl_createv(clog, 0, NULL, NULL,
 1733                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1734                        CTLTYPE_INT, "dostats",
 1735                        SYSCTL_DESCR("Maintain statistics on LFS operations"),
 1736                        sysctl_lfs_dostats, 0, &lfs_dostats, 0,
 1737                        CTL_VFS, 5, LFS_DOSTATS, CTL_EOL);
 1738 }
 1739 
 1740 /*
 1741  * ufs_bmaparray callback function for writing.
 1742  *
 1743  * Since blocks will be written to the new segment anyway,
 1744  * we don't care about current daddr of them.
 1745  */
 1746 static boolean_t
 1747 lfs_issequential_hole(const struct ufsmount *ump,
 1748     daddr_t daddr0, daddr_t daddr1)
 1749 {
 1750 
 1751         KASSERT(daddr0 == UNWRITTEN ||
 1752             (0 <= daddr0 && daddr0 <= LFS_MAX_DADDR));
 1753         KASSERT(daddr1 == UNWRITTEN ||
 1754             (0 <= daddr1 && daddr1 <= LFS_MAX_DADDR));
 1755 
 1756         /* NOTE: all we want to know here is 'hole or not'. */
 1757         /* NOTE: UNASSIGNED is converted to 0 by ufs_bmaparray. */
 1758 
 1759         /*
 1760          * treat UNWRITTENs and all resident blocks as 'contiguous'
 1761          */
 1762         if (daddr0 != 0 && daddr1 != 0)
 1763                 return TRUE;
 1764 
 1765         /*
 1766          * both are in hole?
 1767          */
 1768         if (daddr0 == 0 && daddr1 == 0)
 1769                 return TRUE; /* all holes are 'contiguous' for us. */
 1770 
 1771         return FALSE;
 1772 }
 1773 
 1774 /*
 1775  * lfs_gop_write functions exactly like genfs_gop_write, except that
 1776  * (1) it requires the seglock to be held by its caller, and sp->fip
 1777  *     to be properly initialized (it will return without re-initializing
 1778  *     sp->fip, and without calling lfs_writeseg).
 1779  * (2) it uses the remaining space in the segment, rather than VOP_BMAP,
 1780  *     to determine how large a block it can write at once (though it does
 1781  *     still use VOP_BMAP to find holes in the file);
 1782  * (3) it calls lfs_gatherblock instead of VOP_STRATEGY on its blocks
 1783  *     (leaving lfs_writeseg to deal with the cluster blocks, so we might
 1784  *     now have clusters of clusters, ick.)
 1785  */
 1786 static int
 1787 lfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags)
 1788 {
 1789         int i, s, error, run;
 1790         int fs_bshift;
 1791         vaddr_t kva;
 1792         off_t eof, offset, startoffset;
 1793         size_t bytes, iobytes, skipbytes;
 1794         daddr_t lbn, blkno;
 1795         struct vm_page *pg;
 1796         struct buf *mbp, *bp;
 1797         struct vnode *devvp = VTOI(vp)->i_devvp;
 1798         struct inode *ip = VTOI(vp);
 1799         struct lfs *fs = ip->i_lfs;
 1800         struct segment *sp = fs->lfs_sp;
 1801         UVMHIST_FUNC("lfs_gop_write"); UVMHIST_CALLED(ubchist);
 1802 
 1803         /* The Ifile lives in the buffer cache */
 1804         if (vp == fs->lfs_ivnode)
 1805                 return genfs_compat_gop_write(vp, pgs, npages, flags);
 1806 
 1807         /*
 1808          * Sometimes things slip past the filters in lfs_putpages,
 1809          * and the pagedaemon tries to write pages---problem is
 1810          * that the pagedaemon never acquires the segment lock.
 1811          *
 1812          * Unbusy and unclean the pages, and put them on the ACTIVE
 1813          * queue under the hypothesis that they couldn't have got here
 1814          * unless they were modified *quite* recently.
 1815          *
 1816          * XXXUBC that last statement is an oversimplification of course.
 1817          */
 1818         if (!(fs->lfs_seglock) || fs->lfs_lockpid != curproc->p_pid) {
 1819                 simple_lock(&vp->v_interlock);
 1820 #ifdef DEBUG
 1821                 printf("lfs_gop_write: seglock not held\n");
 1822 #endif
 1823                 uvm_lock_pageq();
 1824                 for (i = 0; i < npages; i++) {
 1825                         pg = pgs[i];
 1826 
 1827                         if (pg->flags & PG_PAGEOUT)
 1828                                 uvmexp.paging--;
 1829                         if (pg->flags & PG_DELWRI) {
 1830                                 uvm_pageunwire(pg);
 1831                         }
 1832                         uvm_pageactivate(pg);
 1833                         pg->flags &= ~(PG_CLEAN|PG_DELWRI|PG_PAGEOUT|PG_RELEASED);
 1834 #ifdef DEBUG_LFS
 1835                         printf("pg[%d]->flags = %x\n", i, pg->flags);
 1836                         printf("pg[%d]->pqflags = %x\n", i, pg->pqflags);
 1837                         printf("pg[%d]->uanon = %p\n", i, pg->uanon);
 1838                         printf("pg[%d]->uobject = %p\n", i, pg->uobject);
 1839                         printf("pg[%d]->wire_count = %d\n", i, pg->wire_count);
 1840                         printf("pg[%d]->loan_count = %d\n", i, pg->loan_count);
 1841 #endif
 1842                 }
 1843                 /* uvm_pageunbusy takes care of PG_BUSY, PG_WANTED */
 1844                 uvm_page_unbusy(pgs, npages);
 1845                 uvm_unlock_pageq();
 1846                 simple_unlock(&vp->v_interlock);
 1847                 return EAGAIN;
 1848         }
 1849 
 1850         UVMHIST_LOG(ubchist, "vp %p pgs %p npages %d flags 0x%x",
 1851             vp, pgs, npages, flags);
 1852 
 1853         GOP_SIZE(vp, vp->v_size, &eof, GOP_SIZE_WRITE);
 1854 
 1855         if (vp->v_type == VREG)
 1856                 fs_bshift = vp->v_mount->mnt_fs_bshift;
 1857         else
 1858                 fs_bshift = DEV_BSHIFT;
 1859         error = 0;
 1860         pg = pgs[0];
 1861         startoffset = pg->offset;
 1862         bytes = MIN(npages << PAGE_SHIFT, eof - startoffset);
 1863         skipbytes = 0;
 1864 
 1865         /* KASSERT(bytes != 0); */
 1866         if (bytes == 0)
 1867                 printf("ino %d bytes == 0 offset %" PRId64 "\n",
 1868                         VTOI(vp)->i_number, pgs[0]->offset);
 1869 
 1870         /* Swap PG_DELWRI for PG_PAGEOUT */
 1871         for (i = 0; i < npages; i++)
 1872                 if (pgs[i]->flags & PG_DELWRI) {
 1873                         KASSERT(!(pgs[i]->flags & PG_PAGEOUT));
 1874                         pgs[i]->flags &= ~PG_DELWRI;
 1875                         pgs[i]->flags |= PG_PAGEOUT;
 1876                         uvmexp.paging++;
 1877                         uvm_lock_pageq();
 1878                         uvm_pageunwire(pgs[i]);
 1879                         uvm_unlock_pageq();
 1880                 }
 1881 
 1882         /*
 1883          * Check to make sure we're starting on a block boundary.
 1884          * We'll check later to make sure we always write entire
 1885          * blocks (or fragments).
 1886          */
 1887         if (startoffset & fs->lfs_bmask)
 1888                 printf("%" PRId64 " & %" PRId64 " = %" PRId64 "\n",
 1889                         startoffset, fs->lfs_bmask,
 1890                         startoffset & fs->lfs_bmask);
 1891         KASSERT((startoffset & fs->lfs_bmask) == 0);
 1892         if (bytes & fs->lfs_ffmask) {
 1893                 printf("lfs_gop_write: asked to write %ld bytes\n", (long)bytes);
 1894                 panic("lfs_gop_write: non-integer blocks");
 1895         }
 1896 
 1897         kva = uvm_pagermapin(pgs, npages,
 1898             UVMPAGER_MAPIN_WRITE | UVMPAGER_MAPIN_WAITOK);
 1899 
 1900         s = splbio();
 1901         simple_lock(&global_v_numoutput_slock);
 1902         vp->v_numoutput += 2; /* one for biodone, one for aiodone */
 1903         simple_unlock(&global_v_numoutput_slock);
 1904         mbp = pool_get(&bufpool, PR_WAITOK);
 1905         splx(s);
 1906 
 1907         memset(mbp, 0, sizeof(*bp));
 1908         BUF_INIT(mbp);
 1909         UVMHIST_LOG(ubchist, "vp %p mbp %p num now %d bytes 0x%x",
 1910             vp, mbp, vp->v_numoutput, bytes);
 1911         mbp->b_bufsize = npages << PAGE_SHIFT;
 1912         mbp->b_data = (void *)kva;
 1913         mbp->b_resid = mbp->b_bcount = bytes;
 1914         mbp->b_flags = B_BUSY|B_WRITE|B_AGE|B_CALL;
 1915         mbp->b_iodone = uvm_aio_biodone;
 1916         mbp->b_vp = vp;
 1917 
 1918         bp = NULL;
 1919         for (offset = startoffset;
 1920             bytes > 0;
 1921             offset += iobytes, bytes -= iobytes) {
 1922                 lbn = offset >> fs_bshift;
 1923                 error = ufs_bmaparray(vp, lbn, &blkno, NULL, NULL, &run,
 1924                     lfs_issequential_hole);
 1925                 if (error) {
 1926                         UVMHIST_LOG(ubchist, "ufs_bmaparray() -> %d",
 1927                             error,0,0,0);
 1928                         skipbytes += bytes;
 1929                         bytes = 0;
 1930                         break;
 1931                 }
 1932 
 1933                 iobytes = MIN((((off_t)lbn + 1 + run) << fs_bshift) - offset,
 1934                     bytes);
 1935                 if (blkno == (daddr_t)-1) {
 1936                         skipbytes += iobytes;
 1937                         continue;
 1938                 }
 1939 
 1940                 /*
 1941                  * Discover how much we can really pack into this buffer.
 1942                  */
 1943                 /* If no room in the current segment, finish it up */
 1944                 if (sp->sum_bytes_left < sizeof(int32_t) ||
 1945                     sp->seg_bytes_left < (1 << fs->lfs_bshift)) {
 1946                         int version;
 1947 
 1948                         lfs_updatemeta(sp);
 1949 
 1950                         version = sp->fip->fi_version;
 1951                         (void) lfs_writeseg(fs, sp);
 1952                         
 1953                         sp->fip->fi_version = version;
 1954                         sp->fip->fi_ino = ip->i_number;
 1955                         /* Add the current file to the segment summary. */
 1956                         ++((SEGSUM *)(sp->segsum))->ss_nfinfo;
 1957                         sp->sum_bytes_left -= FINFOSIZE;
 1958                 }
 1959                 /* Check both for space in segment and space in segsum */
 1960                 iobytes = MIN(iobytes, (sp->seg_bytes_left >> fs_bshift)
 1961                                         << fs_bshift);
 1962                 iobytes = MIN(iobytes, (sp->sum_bytes_left / sizeof(int32_t))
 1963                                        << fs_bshift);
 1964                 KASSERT(iobytes > 0);
 1965 
 1966                 /* if it's really one i/o, don't make a second buf */
 1967                 if (offset == startoffset && iobytes == bytes) {
 1968                         bp = mbp;
 1969                         /* printf("bp is mbp\n"); */
 1970                         /* correct overcount if there is no second buffer */
 1971                         s = splbio();
 1972                         simple_lock(&global_v_numoutput_slock);
 1973                         --vp->v_numoutput;
 1974                         simple_unlock(&global_v_numoutput_slock);
 1975                         splx(s);
 1976                 } else {
 1977                         /* printf("bp is not mbp\n"); */
 1978                         s = splbio();
 1979                         bp = pool_get(&bufpool, PR_WAITOK);
 1980                         UVMHIST_LOG(ubchist, "vp %p bp %p num now %d",
 1981                             vp, bp, vp->v_numoutput, 0);
 1982                         splx(s);
 1983                         memset(bp, 0, sizeof(*bp));
 1984                         BUF_INIT(bp);
 1985                         bp->b_data = (char *)kva +
 1986                             (vaddr_t)(offset - pg->offset);
 1987                         bp->b_resid = bp->b_bcount = iobytes;
 1988                         bp->b_flags = B_BUSY|B_WRITE|B_CALL;
 1989                         bp->b_iodone = uvm_aio_biodone1;
 1990                 }
 1991 
 1992                 /* XXX This is silly ... is this necessary? */
 1993                 bp->b_vp = NULL;
 1994                 s = splbio();
 1995                 bgetvp(vp, bp);
 1996                 splx(s);
 1997 
 1998                 bp->b_lblkno = lblkno(fs, offset);
 1999                 bp->b_private = mbp;
 2000                 if (devvp->v_type == VBLK) {
 2001                         bp->b_dev = devvp->v_rdev;
 2002                 }
 2003                 VOP_BWRITE(bp);
 2004                 while (lfs_gatherblock(sp, bp, NULL))
 2005                         continue;
 2006         }
 2007 
 2008         if (skipbytes) {
 2009                 UVMHIST_LOG(ubchist, "skipbytes %d", skipbytes, 0,0,0);
 2010                 s = splbio();
 2011                 if (error) {
 2012                         mbp->b_flags |= B_ERROR;
 2013                         mbp->b_error = error;
 2014                 }
 2015                 mbp->b_resid -= skipbytes;
 2016                 if (mbp->b_resid == 0) {
 2017                         biodone(mbp);
 2018                 }
 2019                 splx(s);
 2020         }
 2021         UVMHIST_LOG(ubchist, "returning 0", 0,0,0,0);
 2022         return (0);
 2023 }
 2024 
 2025 /*
 2026  * finish vnode/inode initialization.
 2027  * used by lfs_vget and lfs_fastvget.
 2028  */
 2029 void
 2030 lfs_vinit(struct mount *mp, struct vnode **vpp)
 2031 {
 2032         struct vnode *vp = *vpp;
 2033         struct inode *ip = VTOI(vp);
 2034         struct ufsmount *ump = VFSTOUFS(mp);
 2035         int i;
 2036 
 2037         ip->i_mode = ip->i_ffs1_mode;
 2038         ip->i_ffs_effnlink = ip->i_nlink = ip->i_ffs1_nlink;
 2039         ip->i_lfs_osize = ip->i_size = ip->i_ffs1_size;
 2040         ip->i_flags = ip->i_ffs1_flags;
 2041         ip->i_gen = ip->i_ffs1_gen;
 2042         ip->i_uid = ip->i_ffs1_uid;
 2043         ip->i_gid = ip->i_ffs1_gid;
 2044 
 2045         ip->i_lfs_effnblks = ip->i_ffs1_blocks;
 2046 
 2047         /*
 2048          * Initialize the vnode from the inode, check for aliases.  In all
 2049          * cases re-init ip, the underlying vnode/inode may have changed.
 2050          */
 2051         ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp);
 2052 
 2053         memset(ip->i_lfs_fragsize, 0, NDADDR * sizeof(*ip->i_lfs_fragsize));
 2054         if (vp->v_type != VLNK ||
 2055             VTOI(vp)->i_size >= vp->v_mount->mnt_maxsymlinklen) {
 2056                 struct lfs *fs = ump->um_lfs;
 2057 #ifdef DEBUG
 2058                 for (i = (ip->i_size + fs->lfs_bsize - 1) >> fs->lfs_bshift;
 2059                     i < NDADDR; i++) {
 2060                         if (ip->i_ffs1_db[i] != 0) {
 2061 inconsistent:
 2062                                 lfs_dump_dinode(ip->i_din.ffs1_din);
 2063                                 panic("inconsistent inode");
 2064                         }
 2065                 }
 2066                 for ( ; i < NDADDR + NIADDR; i++) {
 2067                         if (ip->i_ffs1_ib[i - NDADDR] != 0) {
 2068                                 goto inconsistent;
 2069                         }
 2070                 }
 2071 #endif /* DEBUG */
 2072                 for (i = 0; i < NDADDR; i++)
 2073                         if (ip->i_ffs1_db[i] != 0)
 2074                                 ip->i_lfs_fragsize[i] = blksize(fs, ip, i);
 2075         }
 2076 
 2077 #ifdef DEBUG
 2078         if (vp->v_type == VNON) {
 2079                 printf("lfs_vinit: ino %d is type VNON! (ifmt=%o)\n",
 2080                        ip->i_number, (ip->i_mode & IFMT) >> 12);
 2081                 lfs_dump_dinode(ip->i_din.ffs1_din);
 2082 #ifdef DDB
 2083                 Debugger();
 2084 #endif /* DDB */
 2085         }
 2086 #endif /* DEBUG */
 2087 
 2088         /*
 2089          * Finish inode initialization now that aliasing has been resolved.
 2090          */
 2091 
 2092         ip->i_devvp = ump->um_devvp;
 2093         VREF(ip->i_devvp);
 2094         genfs_node_init(vp, &lfs_genfsops);
 2095         uvm_vnp_setsize(vp, ip->i_size);
 2096 
 2097         *vpp = vp;
 2098 }

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