tools/llvm: Do not build with symbols

[minix3.git] / sys / ufs / ffs / ffs_inode.c

/*      $NetBSD: ffs_inode.c,v 1.116 2013/10/20 00:29:10 htodd Exp $    */

/*-
 * Copyright (c) 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)ffs_inode.c 8.13 (Berkeley) 4/21/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_inode.c,v 1.116 2013/10/20 00:29:10 htodd Exp $");

#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
#include "opt_quota.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/fstrans.h>
#include <sys/kauth.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/trace.h>
#include <sys/vnode.h>
#include <sys/wapbl.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ufs/ufs_wapbl.h>

#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

static int ffs_indirtrunc(struct inode *, daddr_t, daddr_t, daddr_t, int,
                          int64_t *);

/*
 * Update the access, modified, and inode change times as specified
 * by the IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively.
 * The IN_MODIFIED flag is used to specify that the inode needs to be
 * updated but that the times have already been set. The access
 * and modified times are taken from the second and third parameters;
 * the inode change time is always taken from the current time. If
 * UPDATE_WAIT flag is set, or UPDATE_DIROP is set then wait for the
 * disk write of the inode to complete.
 */

int
ffs_update(struct vnode *vp, const struct timespec *acc,
    const struct timespec *mod, int updflags)
{
        struct fs *fs;
        struct buf *bp;
        struct inode *ip;
        int error;
        void *cp;
        int waitfor, flags;

        if (vp->v_mount->mnt_flag & MNT_RDONLY)
                return (0);
        ip = VTOI(vp);
        FFS_ITIMES(ip, acc, mod, NULL);
        if (updflags & UPDATE_CLOSE)
                flags = ip->i_flag & (IN_MODIFIED | IN_ACCESSED);
        else
                flags = ip->i_flag & IN_MODIFIED;
        if (flags == 0)
                return (0);
        fs = ip->i_fs;

        if ((flags & IN_MODIFIED) != 0 &&
            (vp->v_mount->mnt_flag & MNT_ASYNC) == 0) {
                waitfor = updflags & UPDATE_WAIT;
                if ((updflags & UPDATE_DIROP) != 0)
                        waitfor |= UPDATE_WAIT;
        } else
                waitfor = 0;

        /*
         * Ensure that uid and gid are correct. This is a temporary
         * fix until fsck has been changed to do the update.
         */
        if (fs->fs_magic == FS_UFS1_MAGIC &&                    /* XXX */
            fs->fs_old_inodefmt < FS_44INODEFMT) {              /* XXX */
                ip->i_ffs1_ouid = ip->i_uid;    /* XXX */
                ip->i_ffs1_ogid = ip->i_gid;    /* XXX */
        }                                                       /* XXX */
        error = bread(ip->i_devvp,
                      FFS_FSBTODB(fs, ino_to_fsba(fs, ip->i_number)),
                      (int)fs->fs_bsize, NOCRED, B_MODIFY, &bp);
        if (error) {
                return (error);
        }
        ip->i_flag &= ~(IN_MODIFIED | IN_ACCESSED);
        /* Keep unlinked inode list up to date */
        KDASSERTMSG(DIP(ip, nlink) == ip->i_nlink,
            "DIP(ip, nlink) [%d] == ip->i_nlink [%d]",
            DIP(ip, nlink), ip->i_nlink);
        if (ip->i_mode) {
                if (ip->i_nlink > 0) {
                        UFS_WAPBL_UNREGISTER_INODE(ip->i_ump->um_mountp,
                            ip->i_number, ip->i_mode);
                } else {
                        UFS_WAPBL_REGISTER_INODE(ip->i_ump->um_mountp,
                            ip->i_number, ip->i_mode);
                }
        }
        if (fs->fs_magic == FS_UFS1_MAGIC) {
                cp = (char *)bp->b_data +
                    (ino_to_fsbo(fs, ip->i_number) * DINODE1_SIZE);
#ifdef FFS_EI
                if (UFS_FSNEEDSWAP(fs))
                        ffs_dinode1_swap(ip->i_din.ffs1_din,
                            (struct ufs1_dinode *)cp);
                else
#endif
                        memcpy(cp, ip->i_din.ffs1_din, DINODE1_SIZE);
        } else {
                cp = (char *)bp->b_data +
                    (ino_to_fsbo(fs, ip->i_number) * DINODE2_SIZE);
#ifdef FFS_EI
                if (UFS_FSNEEDSWAP(fs))
                        ffs_dinode2_swap(ip->i_din.ffs2_din,
                            (struct ufs2_dinode *)cp);
                else
#endif
                        memcpy(cp, ip->i_din.ffs2_din, DINODE2_SIZE);
        }
        if (waitfor) {
                return (bwrite(bp));
        } else {
                bdwrite(bp);
                return (0);
        }
}

#define SINGLE  0       /* index of single indirect block */
#define DOUBLE  1       /* index of double indirect block */
#define TRIPLE  2       /* index of triple indirect block */
/*
 * Truncate the inode oip to at most length size, freeing the
 * disk blocks.
 */
int
ffs_truncate(struct vnode *ovp, off_t length, int ioflag, kauth_cred_t cred)
{
        daddr_t lastblock;
        struct inode *oip = VTOI(ovp);
        daddr_t bn, lastiblock[UFS_NIADDR], indir_lbn[UFS_NIADDR];
        daddr_t blks[UFS_NDADDR + UFS_NIADDR];
        struct fs *fs;
        int offset, pgoffset, level;
        int64_t count, blocksreleased = 0;
        int i, aflag, nblocks;
        int error, allerror = 0;
        off_t osize;
        int sync;
        struct ufsmount *ump = oip->i_ump;

        if (ovp->v_type == VCHR || ovp->v_type == VBLK ||
            ovp->v_type == VFIFO || ovp->v_type == VSOCK) {
                KASSERT(oip->i_size == 0);
                return 0;
        }

        if (length < 0)
                return (EINVAL);

        if (ovp->v_type == VLNK &&
            (oip->i_size < ump->um_maxsymlinklen ||
             (ump->um_maxsymlinklen == 0 && DIP(oip, blocks) == 0))) {
                KDASSERT(length == 0);
                memset(SHORTLINK(oip), 0, (size_t)oip->i_size);
                oip->i_size = 0;
                DIP_ASSIGN(oip, size, 0);
                oip->i_flag |= IN_CHANGE | IN_UPDATE;
                return (ffs_update(ovp, NULL, NULL, 0));
        }
        if (oip->i_size == length) {
                /* still do a uvm_vnp_setsize() as writesize may be larger */
                uvm_vnp_setsize(ovp, length);
                oip->i_flag |= IN_CHANGE | IN_UPDATE;
                return (ffs_update(ovp, NULL, NULL, 0));
        }
        fs = oip->i_fs;
        if (length > ump->um_maxfilesize)
                return (EFBIG);

        if ((oip->i_flags & SF_SNAPSHOT) != 0)
                ffs_snapremove(ovp);

        osize = oip->i_size;
        aflag = ioflag & IO_SYNC ? B_SYNC : 0;

        /*
         * Lengthen the size of the file. We must ensure that the
         * last byte of the file is allocated. Since the smallest
         * value of osize is 0, length will be at least 1.
         */

        if (osize < length) {
                if (ffs_lblkno(fs, osize) < UFS_NDADDR &&
                    ffs_lblkno(fs, osize) != ffs_lblkno(fs, length) &&
                    ffs_blkroundup(fs, osize) != osize) {
                        off_t eob;

                        eob = ffs_blkroundup(fs, osize);
                        uvm_vnp_setwritesize(ovp, eob);
                        error = ufs_balloc_range(ovp, osize, eob - osize,
                            cred, aflag);
                        if (error) {
                                (void) ffs_truncate(ovp, osize,
                                    ioflag & IO_SYNC, cred);
                                return error;
                        }
                        if (ioflag & IO_SYNC) {
                                mutex_enter(ovp->v_interlock);
                                VOP_PUTPAGES(ovp,
                                    trunc_page(osize & fs->fs_bmask),
                                    round_page(eob), PGO_CLEANIT | PGO_SYNCIO |
                                    PGO_JOURNALLOCKED);
                        }
                }
                uvm_vnp_setwritesize(ovp, length);
                error = ufs_balloc_range(ovp, length - 1, 1, cred, aflag);
                if (error) {
                        (void) ffs_truncate(ovp, osize, ioflag & IO_SYNC, cred);
                        return (error);
                }
                uvm_vnp_setsize(ovp, length);
                oip->i_flag |= IN_CHANGE | IN_UPDATE;
                KASSERT(ovp->v_size == oip->i_size);
                return (ffs_update(ovp, NULL, NULL, 0));
        }

        /*
         * When truncating a regular file down to a non-block-aligned size,
         * we must zero the part of last block which is past the new EOF.
         * We must synchronously flush the zeroed pages to disk
         * since the new pages will be invalidated as soon as we
         * inform the VM system of the new, smaller size.
         * We must do this before acquiring the GLOCK, since fetching
         * the pages will acquire the GLOCK internally.
         * So there is a window where another thread could see a whole
         * zeroed page past EOF, but that's life.
         */

        offset = ffs_blkoff(fs, length);
        pgoffset = length & PAGE_MASK;
        if (ovp->v_type == VREG && (pgoffset != 0 || offset != 0) &&
            osize > length) {
                daddr_t lbn;
                voff_t eoz;
                int size;

                if (offset != 0) {
                        error = ufs_balloc_range(ovp, length - 1, 1, cred,
                            aflag);
                        if (error)
                                return error;
                }
                lbn = ffs_lblkno(fs, length);
                size = ffs_blksize(fs, oip, lbn);
                eoz = MIN(MAX(ffs_lblktosize(fs, lbn) + size, round_page(pgoffset)),
                    osize);
                ubc_zerorange(&ovp->v_uobj, length, eoz - length,
                    UBC_UNMAP_FLAG(ovp));
                if (round_page(eoz) > round_page(length)) {
                        mutex_enter(ovp->v_interlock);
                        error = VOP_PUTPAGES(ovp, round_page(length),
                            round_page(eoz),
                            PGO_CLEANIT | PGO_DEACTIVATE | PGO_JOURNALLOCKED |
                            ((ioflag & IO_SYNC) ? PGO_SYNCIO : 0));
                        if (error)
                                return error;
                }
        }

        genfs_node_wrlock(ovp);
        oip->i_size = length;
        DIP_ASSIGN(oip, size, length);
        uvm_vnp_setsize(ovp, length);
        /*
         * Calculate index into inode's block list of
         * last direct and indirect blocks (if any)
         * which we want to keep.  Lastblock is -1 when
         * the file is truncated to 0.
         */
        lastblock = ffs_lblkno(fs, length + fs->fs_bsize - 1) - 1;
        lastiblock[SINGLE] = lastblock - UFS_NDADDR;
        lastiblock[DOUBLE] = lastiblock[SINGLE] - FFS_NINDIR(fs);
        lastiblock[TRIPLE] = lastiblock[DOUBLE] - FFS_NINDIR(fs) * FFS_NINDIR(fs);
        nblocks = btodb(fs->fs_bsize);
        /*
         * Update file and block pointers on disk before we start freeing
         * blocks.  If we crash before free'ing blocks below, the blocks
         * will be returned to the free list.  lastiblock values are also
         * normalized to -1 for calls to ffs_indirtrunc below.
         */
        sync = 0;
        for (level = TRIPLE; level >= SINGLE; level--) {
                blks[UFS_NDADDR + level] = DIP(oip, ib[level]);
                if (lastiblock[level] < 0 && blks[UFS_NDADDR + level] != 0) {
                        sync = 1;
                        DIP_ASSIGN(oip, ib[level], 0);
                        lastiblock[level] = -1;
                }
        }
        for (i = 0; i < UFS_NDADDR; i++) {
                blks[i] = DIP(oip, db[i]);
                if (i > lastblock && blks[i] != 0) {
                        sync = 1;
                        DIP_ASSIGN(oip, db[i], 0);
                }
        }
        oip->i_flag |= IN_CHANGE | IN_UPDATE;
        if (sync) {
                error = ffs_update(ovp, NULL, NULL, UPDATE_WAIT);
                if (error && !allerror)
                        allerror = error;
        }

        /*
         * Having written the new inode to disk, save its new configuration
         * and put back the old block pointers long enough to process them.
         * Note that we save the new block configuration so we can check it
         * when we are done.
         */
        for (i = 0; i < UFS_NDADDR; i++) {
                bn = DIP(oip, db[i]);
                DIP_ASSIGN(oip, db[i], blks[i]);
                blks[i] = bn;
        }
        for (i = 0; i < UFS_NIADDR; i++) {
                bn = DIP(oip, ib[i]);
                DIP_ASSIGN(oip, ib[i], blks[UFS_NDADDR + i]);
                blks[UFS_NDADDR + i] = bn;
        }

        oip->i_size = osize;
        DIP_ASSIGN(oip, size, osize);
        error = vtruncbuf(ovp, lastblock + 1, 0, 0);
        if (error && !allerror)
                allerror = error;

        /*
         * Indirect blocks first.
         */
        indir_lbn[SINGLE] = -UFS_NDADDR;
        indir_lbn[DOUBLE] = indir_lbn[SINGLE] - FFS_NINDIR(fs) - 1;
        indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - FFS_NINDIR(fs) * FFS_NINDIR(fs) - 1;
        for (level = TRIPLE; level >= SINGLE; level--) {
                if (oip->i_ump->um_fstype == UFS1)
                        bn = ufs_rw32(oip->i_ffs1_ib[level],UFS_FSNEEDSWAP(fs));
                else
                        bn = ufs_rw64(oip->i_ffs2_ib[level],UFS_FSNEEDSWAP(fs));
                if (bn != 0) {
                        error = ffs_indirtrunc(oip, indir_lbn[level],
                            FFS_FSBTODB(fs, bn), lastiblock[level], level, &count);
                        if (error)
                                allerror = error;
                        blocksreleased += count;
                        if (lastiblock[level] < 0) {
                                DIP_ASSIGN(oip, ib[level], 0);
                                if (oip->i_ump->um_mountp->mnt_wapbl) {
                                        UFS_WAPBL_REGISTER_DEALLOCATION(
                                            oip->i_ump->um_mountp,
                                            FFS_FSBTODB(fs, bn), fs->fs_bsize);
                                } else
                                        ffs_blkfree(fs, oip->i_devvp, bn,
                                            fs->fs_bsize, oip->i_number);
                                blocksreleased += nblocks;
                        }
                }
                if (lastiblock[level] >= 0)
                        goto done;
        }

        /*
         * All whole direct blocks or frags.
         */
        for (i = UFS_NDADDR - 1; i > lastblock; i--) {
                long bsize;

                if (oip->i_ump->um_fstype == UFS1)
                        bn = ufs_rw32(oip->i_ffs1_db[i], UFS_FSNEEDSWAP(fs));
                else
                        bn = ufs_rw64(oip->i_ffs2_db[i], UFS_FSNEEDSWAP(fs));
                if (bn == 0)
                        continue;
                DIP_ASSIGN(oip, db[i], 0);
                bsize = ffs_blksize(fs, oip, i);
                if ((oip->i_ump->um_mountp->mnt_wapbl) &&
                    (ovp->v_type != VREG)) {
                        UFS_WAPBL_REGISTER_DEALLOCATION(oip->i_ump->um_mountp,
                            FFS_FSBTODB(fs, bn), bsize);
                } else
                        ffs_blkfree(fs, oip->i_devvp, bn, bsize, oip->i_number);
                blocksreleased += btodb(bsize);
        }
        if (lastblock < 0)
                goto done;

        /*
         * Finally, look for a change in size of the
         * last direct block; release any frags.
         */
        if (oip->i_ump->um_fstype == UFS1)
                bn = ufs_rw32(oip->i_ffs1_db[lastblock], UFS_FSNEEDSWAP(fs));
        else
                bn = ufs_rw64(oip->i_ffs2_db[lastblock], UFS_FSNEEDSWAP(fs));
        if (bn != 0) {
                long oldspace, newspace;

                /*
                 * Calculate amount of space we're giving
                 * back as old block size minus new block size.
                 */
                oldspace = ffs_blksize(fs, oip, lastblock);
                oip->i_size = length;
                DIP_ASSIGN(oip, size, length);
                newspace = ffs_blksize(fs, oip, lastblock);
                if (newspace == 0)
                        panic("itrunc: newspace");
                if (oldspace - newspace > 0) {
                        /*
                         * Block number of space to be free'd is
                         * the old block # plus the number of frags
                         * required for the storage we're keeping.
                         */
                        bn += ffs_numfrags(fs, newspace);
                        if ((oip->i_ump->um_mountp->mnt_wapbl) &&
                            (ovp->v_type != VREG)) {
                                UFS_WAPBL_REGISTER_DEALLOCATION(
                                    oip->i_ump->um_mountp, FFS_FSBTODB(fs, bn),
                                    oldspace - newspace);
                        } else
                                ffs_blkfree(fs, oip->i_devvp, bn,
                                    oldspace - newspace, oip->i_number);
                        blocksreleased += btodb(oldspace - newspace);
                }
        }

done:
#ifdef DIAGNOSTIC
        for (level = SINGLE; level <= TRIPLE; level++)
                if (blks[UFS_NDADDR + level] != DIP(oip, ib[level]))
                        panic("itrunc1");
        for (i = 0; i < UFS_NDADDR; i++)
                if (blks[i] != DIP(oip, db[i]))
                        panic("itrunc2");
        if (length == 0 &&
            (!LIST_EMPTY(&ovp->v_cleanblkhd) || !LIST_EMPTY(&ovp->v_dirtyblkhd)))
                panic("itrunc3");
#endif /* DIAGNOSTIC */
        /*
         * Put back the real size.
         */
        oip->i_size = length;
        DIP_ASSIGN(oip, size, length);
        DIP_ADD(oip, blocks, -blocksreleased);
        genfs_node_unlock(ovp);
        oip->i_flag |= IN_CHANGE;
        UFS_WAPBL_UPDATE(ovp, NULL, NULL, 0);
#if defined(QUOTA) || defined(QUOTA2)
        (void) chkdq(oip, -blocksreleased, NOCRED, 0);
#endif
        KASSERT(ovp->v_type != VREG || ovp->v_size == oip->i_size);
        return (allerror);
}

/*
 * Release blocks associated with the inode ip and stored in the indirect
 * block bn.  Blocks are free'd in LIFO order up to (but not including)
 * lastbn.  If level is greater than SINGLE, the block is an indirect block
 * and recursive calls to indirtrunc must be used to cleanse other indirect
 * blocks.
 *
 * NB: triple indirect blocks are untested.
 */
static int
ffs_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn, daddr_t lastbn,
    int level, int64_t *countp)
{
        int i;
        struct buf *bp;
        struct fs *fs = ip->i_fs;
        int32_t *bap1 = NULL;
        int64_t *bap2 = NULL;
        struct vnode *vp;
        daddr_t nb, nlbn, last;
        char *copy = NULL;
        int64_t blkcount, factor, blocksreleased = 0;
        int nblocks;
        int error = 0, allerror = 0;
        const int needswap = UFS_FSNEEDSWAP(fs);
#define RBAP(ip, i) (((ip)->i_ump->um_fstype == UFS1) ? \
            ufs_rw32(bap1[i], needswap) : ufs_rw64(bap2[i], needswap))
#define BAP_ASSIGN(ip, i, value)                                        \
        do {                                                            \
                if ((ip)->i_ump->um_fstype == UFS1)                     \
                        bap1[i] = (value);                              \
                else                                                    \
                        bap2[i] = (value);                              \
        } while(0)

        /*
         * Calculate index in current block of last
         * block to be kept.  -1 indicates the entire
         * block so we need not calculate the index.
         */
        factor = 1;
        for (i = SINGLE; i < level; i++)
                factor *= FFS_NINDIR(fs);
        last = lastbn;
        if (lastbn > 0)
                last /= factor;
        nblocks = btodb(fs->fs_bsize);
        /*
         * Get buffer of block pointers, zero those entries corresponding
         * to blocks to be free'd, and update on disk copy first.  Since
         * double(triple) indirect before single(double) indirect, calls
         * to bmap on these blocks will fail.  However, we already have
         * the on disk address, so we have to set the b_blkno field
         * explicitly instead of letting bread do everything for us.
         */
        vp = ITOV(ip);
        error = ffs_getblk(vp, lbn, FFS_NOBLK, fs->fs_bsize, false, &bp);
        if (error) {
                *countp = 0;
                return error;
        }
        if (bp->b_oflags & (BO_DONE | BO_DELWRI)) {
                /* Braces must be here in case trace evaluates to nothing. */
                trace(TR_BREADHIT, pack(vp, fs->fs_bsize), lbn);
        } else {
                trace(TR_BREADMISS, pack(vp, fs->fs_bsize), lbn);
                curlwp->l_ru.ru_inblock++;      /* pay for read */
                bp->b_flags |= B_READ;
                bp->b_flags &= ~B_COWDONE;      /* we change blkno below */
                if (bp->b_bcount > bp->b_bufsize)
                        panic("ffs_indirtrunc: bad buffer size");
                bp->b_blkno = dbn;
                BIO_SETPRIO(bp, BPRIO_TIMECRITICAL);
                VOP_STRATEGY(vp, bp);
                error = biowait(bp);
                if (error == 0)
                        error = fscow_run(bp, true);
        }
        if (error) {
                brelse(bp, 0);
                *countp = 0;
                return (error);
        }

        if (ip->i_ump->um_fstype == UFS1)
                bap1 = (int32_t *)bp->b_data;
        else
                bap2 = (int64_t *)bp->b_data;
        if (lastbn >= 0) {
                copy = kmem_alloc(fs->fs_bsize, KM_SLEEP);
                memcpy((void *)copy, bp->b_data, (u_int)fs->fs_bsize);
                for (i = last + 1; i < FFS_NINDIR(fs); i++)
                        BAP_ASSIGN(ip, i, 0);
                error = bwrite(bp);
                if (error)
                        allerror = error;
                if (ip->i_ump->um_fstype == UFS1)
                        bap1 = (int32_t *)copy;
                else
                        bap2 = (int64_t *)copy;
        }

        /*
         * Recursively free totally unused blocks.
         */
        for (i = FFS_NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
            i--, nlbn += factor) {
                nb = RBAP(ip, i);
                if (nb == 0)
                        continue;
                if (level > SINGLE) {
                        error = ffs_indirtrunc(ip, nlbn, FFS_FSBTODB(fs, nb),
                                               (daddr_t)-1, level - 1,
                                               &blkcount);
                        if (error)
                                allerror = error;
                        blocksreleased += blkcount;
                }
                if ((ip->i_ump->um_mountp->mnt_wapbl) &&
                    ((level > SINGLE) || (ITOV(ip)->v_type != VREG))) {
                        UFS_WAPBL_REGISTER_DEALLOCATION(ip->i_ump->um_mountp,
                            FFS_FSBTODB(fs, nb), fs->fs_bsize);
                } else
                        ffs_blkfree(fs, ip->i_devvp, nb, fs->fs_bsize,
                            ip->i_number);
                blocksreleased += nblocks;
        }

        /*
         * Recursively free last partial block.
         */
        if (level > SINGLE && lastbn >= 0) {
                last = lastbn % factor;
                nb = RBAP(ip, i);
                if (nb != 0) {
                        error = ffs_indirtrunc(ip, nlbn, FFS_FSBTODB(fs, nb),
                                               last, level - 1, &blkcount);
                        if (error)
                                allerror = error;
                        blocksreleased += blkcount;
                }
        }

        if (copy != NULL) {
                kmem_free(copy, fs->fs_bsize);
        } else {
                brelse(bp, BC_INVAL);
        }

        *countp = blocksreleased;
        return (allerror);
}

void
ffs_itimes(struct inode *ip, const struct timespec *acc,
    const struct timespec *mod, const struct timespec *cre)
{
        struct timespec now;

        if (!(ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE | IN_MODIFY))) {
                return;
        }

        vfs_timestamp(&now);
        if (ip->i_flag & IN_ACCESS) {
                if (acc == NULL)
                        acc = &now;
                DIP_ASSIGN(ip, atime, acc->tv_sec);
                DIP_ASSIGN(ip, atimensec, acc->tv_nsec);
        }
        if (ip->i_flag & (IN_UPDATE | IN_MODIFY)) {
                if ((ip->i_flags & SF_SNAPSHOT) == 0) {
                        if (mod == NULL)
                                mod = &now;
                        DIP_ASSIGN(ip, mtime, mod->tv_sec);
                        DIP_ASSIGN(ip, mtimensec, mod->tv_nsec);
                }
                ip->i_modrev++;
        }
        if (ip->i_flag & (IN_CHANGE | IN_MODIFY)) {
                if (cre == NULL)
                        cre = &now;
                DIP_ASSIGN(ip, ctime, cre->tv_sec);
                DIP_ASSIGN(ip, ctimensec, cre->tv_nsec);
        }
        if (ip->i_flag & (IN_ACCESS | IN_MODIFY))
                ip->i_flag |= IN_ACCESSED;
        if (ip->i_flag & (IN_UPDATE | IN_CHANGE))
                ip->i_flag |= IN_MODIFIED;
        ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE | IN_MODIFY);
}