The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_inode.c

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    1 /*-
    2  *  modified for Lites 1.1
    3  *
    4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
    5  *  University of Utah, Department of Computer Science
    6  */
    7 /*-
    8  * SPDX-License-Identifier: BSD-3-Clause
    9  *
   10  * Copyright (c) 1982, 1986, 1989, 1993
   11  *      The Regents of the University of California.  All rights reserved.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      @(#)ffs_inode.c 8.5 (Berkeley) 12/30/93
   38  * $FreeBSD$
   39  */
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/mount.h>
   44 #include <sys/bio.h>
   45 #include <sys/buf.h>
   46 #include <sys/endian.h>
   47 #include <sys/vnode.h>
   48 #include <sys/malloc.h>
   49 #include <sys/rwlock.h>
   50 #include <sys/sdt.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/vm_extern.h>
   54 
   55 #include <fs/ext2fs/fs.h>
   56 #include <fs/ext2fs/inode.h>
   57 #include <fs/ext2fs/ext2_mount.h>
   58 #include <fs/ext2fs/ext2fs.h>
   59 #include <fs/ext2fs/fs.h>
   60 #include <fs/ext2fs/ext2_extern.h>
   61 #include <fs/ext2fs/ext2_extattr.h>
   62 
   63 /*
   64  * Update the access, modified, and inode change times as specified by the
   65  * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively.  Write the inode
   66  * to disk if the IN_MODIFIED flag is set (it may be set initially, or by
   67  * the timestamp update).  The IN_LAZYMOD flag is set to force a write
   68  * later if not now.  If we write now, then clear both IN_MODIFIED and
   69  * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
   70  * set, then wait for the write to complete.
   71  */
   72 int
   73 ext2_update(struct vnode *vp, int waitfor)
   74 {
   75         struct m_ext2fs *fs;
   76         struct buf *bp;
   77         struct inode *ip;
   78         int error;
   79 
   80         ASSERT_VOP_ELOCKED(vp, "ext2_update");
   81         ext2_itimes(vp);
   82         ip = VTOI(vp);
   83         if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
   84                 return (0);
   85         ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
   86         fs = ip->i_e2fs;
   87         if (fs->e2fs_ronly)
   88                 return (0);
   89         if ((error = bread(ip->i_devvp,
   90             fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
   91             (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
   92                 brelse(bp);
   93                 return (error);
   94         }
   95         error = ext2_i2ei(ip, (struct ext2fs_dinode *)((char *)bp->b_data +
   96             EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)));
   97         if (error) {
   98                 brelse(bp);
   99                 return (error);
  100         }
  101         if (waitfor && !DOINGASYNC(vp))
  102                 return (bwrite(bp));
  103         else {
  104                 bdwrite(bp);
  105                 return (0);
  106         }
  107 }
  108 
  109 #define SINGLE  0       /* index of single indirect block */
  110 #define DOUBLE  1       /* index of double indirect block */
  111 #define TRIPLE  2       /* index of triple indirect block */
  112 
  113 /*
  114  * Release blocks associated with the inode ip and stored in the indirect
  115  * block bn.  Blocks are free'd in LIFO order up to (but not including)
  116  * lastbn.  If level is greater than SINGLE, the block is an indirect block
  117  * and recursive calls to indirtrunc must be used to cleanse other indirect
  118  * blocks.
  119  *
  120  * NB: triple indirect blocks are untested.
  121  */
  122 static int
  123 ext2_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn,
  124     daddr_t lastbn, int level, e4fs_daddr_t *countp)
  125 {
  126         struct buf *bp;
  127         struct m_ext2fs *fs = ip->i_e2fs;
  128         struct vnode *vp;
  129         e2fs_daddr_t *bap, *copy;
  130         int i, nblocks, error = 0, allerror = 0;
  131         e2fs_lbn_t nb, nlbn, last;
  132         e4fs_daddr_t blkcount, factor, blocksreleased = 0;
  133 
  134         /*
  135          * Calculate index in current block of last
  136          * block to be kept.  -1 indicates the entire
  137          * block so we need not calculate the index.
  138          */
  139         factor = 1;
  140         for (i = SINGLE; i < level; i++)
  141                 factor *= NINDIR(fs);
  142         last = lastbn;
  143         if (lastbn > 0)
  144                 last /= factor;
  145         nblocks = btodb(fs->e2fs_bsize);
  146         /*
  147          * Get buffer of block pointers, zero those entries corresponding
  148          * to blocks to be free'd, and update on disk copy first.  Since
  149          * double(triple) indirect before single(double) indirect, calls
  150          * to bmap on these blocks will fail.  However, we already have
  151          * the on disk address, so we have to set the b_blkno field
  152          * explicitly instead of letting bread do everything for us.
  153          */
  154         vp = ITOV(ip);
  155         bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0, 0);
  156         if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
  157                 bp->b_iocmd = BIO_READ;
  158                 if (bp->b_bcount > bp->b_bufsize)
  159                         panic("ext2_indirtrunc: bad buffer size");
  160                 bp->b_blkno = dbn;
  161                 vfs_busy_pages(bp, 0);
  162                 bp->b_iooffset = dbtob(bp->b_blkno);
  163                 bstrategy(bp);
  164                 error = bufwait(bp);
  165         }
  166         if (error) {
  167                 brelse(bp);
  168                 *countp = 0;
  169                 return (error);
  170         }
  171         bap = (e2fs_daddr_t *)bp->b_data;
  172         copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK);
  173         bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->e2fs_bsize);
  174         bzero((caddr_t)&bap[last + 1],
  175             (NINDIR(fs) - (last + 1)) * sizeof(e2fs_daddr_t));
  176         if (last == -1)
  177                 bp->b_flags |= B_INVAL;
  178         if (DOINGASYNC(vp)) {
  179                 bdwrite(bp);
  180         } else {
  181                 error = bwrite(bp);
  182                 if (error)
  183                         allerror = error;
  184         }
  185         bap = copy;
  186 
  187         /*
  188          * Recursively free totally unused blocks.
  189          */
  190         for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
  191             i--, nlbn += factor) {
  192                 nb = le32toh(bap[i]);
  193                 if (nb == 0)
  194                         continue;
  195                 if (level > SINGLE) {
  196                         if ((error = ext2_indirtrunc(ip, nlbn,
  197                             fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0)
  198                                 allerror = error;
  199                         blocksreleased += blkcount;
  200                 }
  201                 ext2_blkfree(ip, nb, fs->e2fs_bsize);
  202                 blocksreleased += nblocks;
  203         }
  204 
  205         /*
  206          * Recursively free last partial block.
  207          */
  208         if (level > SINGLE && lastbn >= 0) {
  209                 last = lastbn % factor;
  210                 nb = le32toh(bap[i]);
  211                 if (nb != 0) {
  212                         if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
  213                             last, level - 1, &blkcount)) != 0)
  214                                 allerror = error;
  215                         blocksreleased += blkcount;
  216                 }
  217         }
  218         free(copy, M_TEMP);
  219         *countp = blocksreleased;
  220         return (allerror);
  221 }
  222 
  223 /*
  224  * Truncate the inode oip to at most length size, freeing the
  225  * disk blocks.
  226  */
  227 static int
  228 ext2_ind_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
  229     struct thread *td)
  230 {
  231         struct vnode *ovp = vp;
  232         e4fs_daddr_t lastblock;
  233         struct inode *oip;
  234         e4fs_daddr_t bn, lbn, lastiblock[EXT2_NIADDR], indir_lbn[EXT2_NIADDR];
  235         uint32_t oldblks[EXT2_NDADDR + EXT2_NIADDR];
  236         uint32_t newblks[EXT2_NDADDR + EXT2_NIADDR];
  237         struct m_ext2fs *fs;
  238         struct buf *bp;
  239         int offset, size, level;
  240         e4fs_daddr_t count, nblocks, blocksreleased = 0;
  241         int error, i, allerror;
  242         off_t osize;
  243 #ifdef INVARIANTS
  244         struct bufobj *bo;
  245 #endif
  246 
  247         oip = VTOI(ovp);
  248 #ifdef INVARIANTS
  249         bo = &ovp->v_bufobj;
  250 #endif
  251 
  252         fs = oip->i_e2fs;
  253         osize = oip->i_size;
  254         /*
  255          * Lengthen the size of the file. We must ensure that the
  256          * last byte of the file is allocated. Since the smallest
  257          * value of osize is 0, length will be at least 1.
  258          */
  259         if (osize < length) {
  260                 if (length > oip->i_e2fs->e2fs_maxfilesize)
  261                         return (EFBIG);
  262                 vnode_pager_setsize(ovp, length);
  263                 offset = blkoff(fs, length - 1);
  264                 lbn = lblkno(fs, length - 1);
  265                 flags |= BA_CLRBUF;
  266                 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
  267                 if (error) {
  268                         vnode_pager_setsize(vp, osize);
  269                         return (error);
  270                 }
  271                 oip->i_size = length;
  272                 if (bp->b_bufsize == fs->e2fs_bsize)
  273                         bp->b_flags |= B_CLUSTEROK;
  274                 if (flags & IO_SYNC)
  275                         bwrite(bp);
  276                 else if (DOINGASYNC(ovp))
  277                         bdwrite(bp);
  278                 else
  279                         bawrite(bp);
  280                 oip->i_flag |= IN_CHANGE | IN_UPDATE;
  281                 return (ext2_update(ovp, !DOINGASYNC(ovp)));
  282         }
  283         /*
  284          * Shorten the size of the file. If the file is not being
  285          * truncated to a block boundary, the contents of the
  286          * partial block following the end of the file must be
  287          * zero'ed in case it ever become accessible again because
  288          * of subsequent file growth.
  289          */
  290         /* I don't understand the comment above */
  291         offset = blkoff(fs, length);
  292         if (offset == 0) {
  293                 oip->i_size = length;
  294         } else {
  295                 lbn = lblkno(fs, length);
  296                 flags |= BA_CLRBUF;
  297                 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
  298                 if (error)
  299                         return (error);
  300                 oip->i_size = length;
  301                 size = blksize(fs, oip, lbn);
  302                 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
  303                 allocbuf(bp, size);
  304                 if (bp->b_bufsize == fs->e2fs_bsize)
  305                         bp->b_flags |= B_CLUSTEROK;
  306                 if (flags & IO_SYNC)
  307                         bwrite(bp);
  308                 else if (DOINGASYNC(ovp))
  309                         bdwrite(bp);
  310                 else
  311                         bawrite(bp);
  312         }
  313         /*
  314          * Calculate index into inode's block list of
  315          * last direct and indirect blocks (if any)
  316          * which we want to keep.  Lastblock is -1 when
  317          * the file is truncated to 0.
  318          */
  319         lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1;
  320         lastiblock[SINGLE] = lastblock - EXT2_NDADDR;
  321         lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
  322         lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
  323         nblocks = btodb(fs->e2fs_bsize);
  324         /*
  325          * Update file and block pointers on disk before we start freeing
  326          * blocks.  If we crash before free'ing blocks below, the blocks
  327          * will be returned to the free list.  lastiblock values are also
  328          * normalized to -1 for calls to ext2_indirtrunc below.
  329          */
  330         for (level = TRIPLE; level >= SINGLE; level--) {
  331                 oldblks[EXT2_NDADDR + level] = oip->i_ib[level];
  332                 if (lastiblock[level] < 0) {
  333                         oip->i_ib[level] = 0;
  334                         lastiblock[level] = -1;
  335                 }
  336         }
  337         for (i = 0; i < EXT2_NDADDR; i++) {
  338                 oldblks[i] = oip->i_db[i];
  339                 if (i > lastblock)
  340                         oip->i_db[i] = 0;
  341         }
  342         oip->i_flag |= IN_CHANGE | IN_UPDATE;
  343         allerror = ext2_update(ovp, !DOINGASYNC(ovp));
  344 
  345         /*
  346          * Having written the new inode to disk, save its new configuration
  347          * and put back the old block pointers long enough to process them.
  348          * Note that we save the new block configuration so we can check it
  349          * when we are done.
  350          */
  351         for (i = 0; i < EXT2_NDADDR; i++) {
  352                 newblks[i] = oip->i_db[i];
  353                 oip->i_db[i] = oldblks[i];
  354         }
  355         for (i = 0; i < EXT2_NIADDR; i++) {
  356                 newblks[EXT2_NDADDR + i] = oip->i_ib[i];
  357                 oip->i_ib[i] = oldblks[EXT2_NDADDR + i];
  358         }
  359         oip->i_size = osize;
  360         error = vtruncbuf(ovp, length, (int)fs->e2fs_bsize);
  361         if (error && (allerror == 0))
  362                 allerror = error;
  363         vnode_pager_setsize(ovp, length);
  364 
  365         /*
  366          * Indirect blocks first.
  367          */
  368         indir_lbn[SINGLE] = -EXT2_NDADDR;
  369         indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
  370         indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
  371         for (level = TRIPLE; level >= SINGLE; level--) {
  372                 bn = oip->i_ib[level];
  373                 if (bn != 0) {
  374                         error = ext2_indirtrunc(oip, indir_lbn[level],
  375                             fsbtodb(fs, bn), lastiblock[level], level, &count);
  376                         if (error)
  377                                 allerror = error;
  378                         blocksreleased += count;
  379                         if (lastiblock[level] < 0) {
  380                                 oip->i_ib[level] = 0;
  381                                 ext2_blkfree(oip, bn, fs->e2fs_fsize);
  382                                 blocksreleased += nblocks;
  383                         }
  384                 }
  385                 if (lastiblock[level] >= 0)
  386                         goto done;
  387         }
  388 
  389         /*
  390          * All whole direct blocks or frags.
  391          */
  392         for (i = EXT2_NDADDR - 1; i > lastblock; i--) {
  393                 long bsize;
  394 
  395                 bn = oip->i_db[i];
  396                 if (bn == 0)
  397                         continue;
  398                 oip->i_db[i] = 0;
  399                 bsize = blksize(fs, oip, i);
  400                 ext2_blkfree(oip, bn, bsize);
  401                 blocksreleased += btodb(bsize);
  402         }
  403         if (lastblock < 0)
  404                 goto done;
  405 
  406         /*
  407          * Finally, look for a change in size of the
  408          * last direct block; release any frags.
  409          */
  410         bn = oip->i_db[lastblock];
  411         if (bn != 0) {
  412                 long oldspace, newspace;
  413 
  414                 /*
  415                  * Calculate amount of space we're giving
  416                  * back as old block size minus new block size.
  417                  */
  418                 oldspace = blksize(fs, oip, lastblock);
  419                 oip->i_size = length;
  420                 newspace = blksize(fs, oip, lastblock);
  421                 if (newspace == 0)
  422                         panic("ext2_truncate: newspace");
  423                 if (oldspace - newspace > 0) {
  424                         /*
  425                          * Block number of space to be free'd is
  426                          * the old block # plus the number of frags
  427                          * required for the storage we're keeping.
  428                          */
  429                         bn += numfrags(fs, newspace);
  430                         ext2_blkfree(oip, bn, oldspace - newspace);
  431                         blocksreleased += btodb(oldspace - newspace);
  432                 }
  433         }
  434 done:
  435 #ifdef INVARIANTS
  436         for (level = SINGLE; level <= TRIPLE; level++)
  437                 if (newblks[EXT2_NDADDR + level] != oip->i_ib[level])
  438                         panic("itrunc1");
  439         for (i = 0; i < EXT2_NDADDR; i++)
  440                 if (newblks[i] != oip->i_db[i])
  441                         panic("itrunc2");
  442         BO_LOCK(bo);
  443         if (length == 0 && (bo->bo_dirty.bv_cnt != 0 ||
  444             bo->bo_clean.bv_cnt != 0))
  445                 panic("itrunc3");
  446         BO_UNLOCK(bo);
  447 #endif  /* INVARIANTS */
  448         /*
  449          * Put back the real size.
  450          */
  451         oip->i_size = length;
  452         if (oip->i_blocks >= blocksreleased)
  453                 oip->i_blocks -= blocksreleased;
  454         else                            /* sanity */
  455                 oip->i_blocks = 0;
  456         oip->i_flag |= IN_CHANGE;
  457         vnode_pager_setsize(ovp, length);
  458         return (allerror);
  459 }
  460 
  461 static int
  462 ext2_ext_truncate(struct vnode *vp, off_t length, int flags,
  463     struct ucred *cred, struct thread *td)
  464 {
  465         struct vnode *ovp = vp;
  466         int32_t lastblock;
  467         struct m_ext2fs *fs;
  468         struct inode *oip;
  469         struct buf *bp;
  470         uint32_t lbn, offset;
  471         int error, size;
  472         off_t osize;
  473 
  474         oip = VTOI(ovp);
  475         fs = oip->i_e2fs;
  476         osize = oip->i_size;
  477 
  478         if (osize < length) {
  479                 if (length > oip->i_e2fs->e2fs_maxfilesize) {
  480                         return (EFBIG);
  481                 }
  482                 vnode_pager_setsize(ovp, length);
  483                 offset = blkoff(fs, length - 1);
  484                 lbn = lblkno(fs, length - 1);
  485                 flags |= BA_CLRBUF;
  486                 error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
  487                 if (error) {
  488                         vnode_pager_setsize(vp, osize);
  489                         return (error);
  490                 }
  491                 oip->i_size = length;
  492                 if (bp->b_bufsize == fs->e2fs_bsize)
  493                         bp->b_flags |= B_CLUSTEROK;
  494                 if (flags & IO_SYNC)
  495                         bwrite(bp);
  496                 else if (DOINGASYNC(ovp))
  497                         bdwrite(bp);
  498                 else
  499                         bawrite(bp);
  500                 oip->i_flag |= IN_CHANGE | IN_UPDATE;
  501                 return (ext2_update(ovp, !DOINGASYNC(ovp)));
  502         }
  503 
  504         lastblock = (length + fs->e2fs_bsize - 1) / fs->e2fs_bsize;
  505         error = ext4_ext_remove_space(oip, lastblock, flags, cred, td);
  506         if (error)
  507                 return (error);
  508 
  509         offset = blkoff(fs, length);
  510         if (offset == 0) {
  511                 oip->i_size = length;
  512         } else {
  513                 lbn = lblkno(fs, length);
  514                 flags |= BA_CLRBUF;
  515                 error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
  516                 if (error) {
  517                         return (error);
  518                 }
  519                 oip->i_size = length;
  520                 size = blksize(fs, oip, lbn);
  521                 bzero((char *)bp->b_data + offset, (u_int)(size - offset));
  522                 allocbuf(bp, size);
  523                 if (bp->b_bufsize == fs->e2fs_bsize)
  524                         bp->b_flags |= B_CLUSTEROK;
  525                 if (flags & IO_SYNC)
  526                         bwrite(bp);
  527                 else if (DOINGASYNC(ovp))
  528                         bdwrite(bp);
  529                 else
  530                         bawrite(bp);
  531         }
  532 
  533         oip->i_size = osize;
  534         error = vtruncbuf(ovp, length, (int)fs->e2fs_bsize);
  535         if (error)
  536                 return (error);
  537 
  538         vnode_pager_setsize(ovp, length);
  539 
  540         oip->i_size = length;
  541         oip->i_flag |= IN_CHANGE | IN_UPDATE;
  542         error = ext2_update(ovp, !DOINGASYNC(ovp));
  543 
  544         return (error);
  545 }
  546 
  547 /*
  548  * Truncate the inode ip to at most length size, freeing the
  549  * disk blocks.
  550  */
  551 int
  552 ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
  553     struct thread *td)
  554 {
  555         struct inode *ip;
  556         int error;
  557 
  558         ASSERT_VOP_LOCKED(vp, "ext2_truncate");
  559 
  560         if (length < 0)
  561                 return (EINVAL);
  562 
  563         ip = VTOI(vp);
  564         if (vp->v_type == VLNK &&
  565             ip->i_size < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) {
  566 #ifdef INVARIANTS
  567                 if (length != 0)
  568                         panic("ext2_truncate: partial truncate of symlink");
  569 #endif
  570                 bzero((char *)&ip->i_shortlink, (u_int)ip->i_size);
  571                 ip->i_size = 0;
  572                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
  573                 return (ext2_update(vp, 1));
  574         }
  575         if (ip->i_size == length) {
  576                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
  577                 return (ext2_update(vp, 0));
  578         }
  579 
  580         if (ip->i_flag & IN_E4EXTENTS)
  581                 error = ext2_ext_truncate(vp, length, flags, cred, td);
  582         else
  583                 error = ext2_ind_truncate(vp, length, flags, cred, td);
  584         cluster_init_vn(&ip->i_clusterw);
  585 
  586         return (error);
  587 }
  588 
  589 /*
  590  *      discard preallocated blocks
  591  */
  592 int
  593 ext2_inactive(struct vop_inactive_args *ap)
  594 {
  595         struct vnode *vp = ap->a_vp;
  596         struct inode *ip = VTOI(vp);
  597         struct thread *td = curthread;
  598         int mode, error = 0;
  599 
  600         /*
  601          * Ignore inodes related to stale file handles.
  602          */
  603         if (ip->i_mode == 0)
  604                 goto out;
  605         if (ip->i_nlink <= 0) {
  606                 ext2_extattr_free(ip);
  607                 error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td);
  608                 ip->i_rdev = 0;
  609                 mode = ip->i_mode;
  610                 ip->i_mode = 0;
  611                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
  612                 ext2_vfree(vp, ip->i_number, mode);
  613         }
  614         if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
  615                 ext2_update(vp, 0);
  616 out:
  617         /*
  618          * If we are done with the inode, reclaim it
  619          * so that it can be reused immediately.
  620          */
  621         if (ip->i_mode == 0)
  622                 vrecycle(vp);
  623         return (error);
  624 }
  625 
  626 /*
  627  * Reclaim an inode so that it can be used for other purposes.
  628  */
  629 int
  630 ext2_reclaim(struct vop_reclaim_args *ap)
  631 {
  632         struct inode *ip;
  633         struct vnode *vp = ap->a_vp;
  634 
  635         ip = VTOI(vp);
  636         if (ip->i_flag & IN_LAZYMOD) {
  637                 ip->i_flag |= IN_MODIFIED;
  638                 ext2_update(vp, 0);
  639         }
  640         vfs_hash_remove(vp);
  641         free(vp->v_data, M_EXT2NODE);
  642         vp->v_data = 0;
  643         return (0);
  644 }

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