1d04725a7a
Ext2fs uses unsigned fields in its dinode struct. FreeBSD can have negative values in some of those fields and the inode is meant to interact with the system so we have never respected the unsigned nature of most of those fields. Block numbers and the NFS generation number do not need to be signed so redefine them as unsigned to better match the on-disk information. MFC after: 1 week
300 lines
7.9 KiB
C
300 lines
7.9 KiB
C
/*-
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* modified for Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_balloc.c 8.4 (Berkeley) 9/23/93
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/lock.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <fs/ext2fs/inode.h>
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#include <fs/ext2fs/ext2fs.h>
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#include <fs/ext2fs/fs.h>
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#include <fs/ext2fs/ext2_extern.h>
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#include <fs/ext2fs/ext2_mount.h>
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/*
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* Balloc defines the structure of file system storage
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* by allocating the physical blocks on a device given
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* the inode and the logical block number in a file.
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*/
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int
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ext2_balloc(ip, lbn, size, cred, bpp, flags)
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struct inode *ip;
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int32_t lbn;
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int size;
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struct ucred *cred;
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struct buf **bpp;
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int flags;
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{
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struct m_ext2fs *fs;
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struct ext2mount *ump;
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int32_t nb;
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struct buf *bp, *nbp;
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struct vnode *vp = ITOV(ip);
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struct indir indirs[NIADDR + 2];
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uint32_t newb, *bap, pref;
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int osize, nsize, num, i, error;
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*bpp = NULL;
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if (lbn < 0)
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return (EFBIG);
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fs = ip->i_e2fs;
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ump = ip->i_ump;
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/*
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* check if this is a sequential block allocation.
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* If so, increment next_alloc fields to allow ext2_blkpref
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* to make a good guess
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*/
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if (lbn == ip->i_next_alloc_block + 1) {
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ip->i_next_alloc_block++;
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ip->i_next_alloc_goal++;
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}
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/*
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* The first NDADDR blocks are direct blocks
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*/
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if (lbn < NDADDR) {
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nb = ip->i_db[lbn];
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/* no new block is to be allocated, and no need to expand
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the file */
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if (nb != 0 && ip->i_size >= (lbn + 1) * fs->e2fs_bsize) {
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error = bread(vp, lbn, fs->e2fs_bsize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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bp->b_blkno = fsbtodb(fs, nb);
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*bpp = bp;
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return (0);
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}
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if (nb != 0) {
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/*
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* Consider need to reallocate a fragment.
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*/
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osize = fragroundup(fs, blkoff(fs, ip->i_size));
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nsize = fragroundup(fs, size);
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if (nsize <= osize) {
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error = bread(vp, lbn, osize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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bp->b_blkno = fsbtodb(fs, nb);
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} else {
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/* Godmar thinks: this shouldn't happen w/o fragments */
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printf("nsize %d(%d) > osize %d(%d) nb %d\n",
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(int)nsize, (int)size, (int)osize,
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(int)ip->i_size, (int)nb);
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panic(
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"ext2_balloc: Something is terribly wrong");
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/*
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* please note there haven't been any changes from here on -
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* FFS seems to work.
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*/
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}
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} else {
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if (ip->i_size < (lbn + 1) * fs->e2fs_bsize)
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nsize = fragroundup(fs, size);
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else
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nsize = fs->e2fs_bsize;
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EXT2_LOCK(ump);
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error = ext2_alloc(ip, lbn,
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ext2_blkpref(ip, lbn, (int)lbn, &ip->i_db[0], 0),
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nsize, cred, &newb);
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if (error)
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return (error);
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bp = getblk(vp, lbn, nsize, 0, 0, 0);
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bp->b_blkno = fsbtodb(fs, newb);
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if (flags & BA_CLRBUF)
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vfs_bio_clrbuf(bp);
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}
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ip->i_db[lbn] = dbtofsb(fs, bp->b_blkno);
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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*bpp = bp;
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return (0);
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}
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/*
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* Determine the number of levels of indirection.
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*/
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pref = 0;
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if ((error = ext2_getlbns(vp, lbn, indirs, &num)) != 0)
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return (error);
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#ifdef DIAGNOSTIC
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if (num < 1)
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panic ("ext2_balloc: ext2_getlbns returned indirect block");
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#endif
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/*
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* Fetch the first indirect block allocating if necessary.
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*/
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--num;
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nb = ip->i_ib[indirs[0].in_off];
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if (nb == 0) {
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EXT2_LOCK(ump);
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pref = ext2_blkpref(ip, lbn, indirs[0].in_off +
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EXT2_NDIR_BLOCKS, &ip->i_db[0], 0);
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if ((error = ext2_alloc(ip, lbn, pref,
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(int)fs->e2fs_bsize, cred, &newb)))
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return (error);
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nb = newb;
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bp = getblk(vp, indirs[1].in_lbn, fs->e2fs_bsize, 0, 0, 0);
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bp->b_blkno = fsbtodb(fs, newb);
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vfs_bio_clrbuf(bp);
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/*
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* Write synchronously so that indirect blocks
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* never point at garbage.
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*/
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if ((error = bwrite(bp)) != 0) {
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ext2_blkfree(ip, nb, fs->e2fs_bsize);
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return (error);
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}
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ip->i_ib[indirs[0].in_off] = newb;
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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}
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/*
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* Fetch through the indirect blocks, allocating as necessary.
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*/
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for (i = 1;;) {
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error = bread(vp,
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indirs[i].in_lbn, (int)fs->e2fs_bsize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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bap = (int32_t *)bp->b_data;
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nb = bap[indirs[i].in_off];
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if (i == num)
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break;
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i += 1;
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if (nb != 0) {
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bqrelse(bp);
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continue;
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}
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EXT2_LOCK(ump);
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if (pref == 0)
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pref = ext2_blkpref(ip, lbn, indirs[i].in_off, bap,
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bp->b_lblkno);
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error = ext2_alloc(ip, lbn, pref, (int)fs->e2fs_bsize, cred, &newb);
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if (error) {
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brelse(bp);
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return (error);
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}
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nb = newb;
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nbp = getblk(vp, indirs[i].in_lbn, fs->e2fs_bsize, 0, 0, 0);
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nbp->b_blkno = fsbtodb(fs, nb);
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vfs_bio_clrbuf(nbp);
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/*
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* Write synchronously so that indirect blocks
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* never point at garbage.
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*/
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if ((error = bwrite(nbp)) != 0) {
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ext2_blkfree(ip, nb, fs->e2fs_bsize);
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EXT2_UNLOCK(ump);
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brelse(bp);
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return (error);
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}
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bap[indirs[i - 1].in_off] = nb;
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/*
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* If required, write synchronously, otherwise use
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* delayed write.
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*/
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if (flags & IO_SYNC) {
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bwrite(bp);
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} else {
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if (bp->b_bufsize == fs->e2fs_bsize)
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bp->b_flags |= B_CLUSTEROK;
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bdwrite(bp);
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}
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}
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/*
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* Get the data block, allocating if necessary.
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*/
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if (nb == 0) {
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EXT2_LOCK(ump);
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pref = ext2_blkpref(ip, lbn, indirs[i].in_off, &bap[0],
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bp->b_lblkno);
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if ((error = ext2_alloc(ip,
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lbn, pref, (int)fs->e2fs_bsize, cred, &newb)) != 0) {
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brelse(bp);
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return (error);
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}
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nb = newb;
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nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0, 0);
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nbp->b_blkno = fsbtodb(fs, nb);
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if (flags & BA_CLRBUF)
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vfs_bio_clrbuf(nbp);
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bap[indirs[i].in_off] = nb;
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/*
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* If required, write synchronously, otherwise use
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* delayed write.
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*/
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if (flags & IO_SYNC) {
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bwrite(bp);
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} else {
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if (bp->b_bufsize == fs->e2fs_bsize)
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bp->b_flags |= B_CLUSTEROK;
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bdwrite(bp);
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}
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*bpp = nbp;
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return (0);
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}
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brelse(bp);
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if (flags & BA_CLRBUF) {
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int seqcount = (flags & BA_SEQMASK) >> BA_SEQSHIFT;
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if (seqcount && (vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
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error = cluster_read(vp, ip->i_size, lbn,
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(int)fs->e2fs_bsize, NOCRED,
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MAXBSIZE, seqcount, &nbp);
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} else {
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error = bread(vp, lbn, (int)fs->e2fs_bsize, NOCRED, &nbp);
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}
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if (error) {
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brelse(nbp);
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return (error);
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}
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} else {
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nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0, 0);
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nbp->b_blkno = fsbtodb(fs, nb);
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}
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*bpp = nbp;
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return (0);
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}
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