9504abaad7
shared code and converting all ufs references. Originally it may have made sense to share common features between the two filesystems, but recently it has only caused problems, the UFS2 work being the final straw. All UFS_* indirect calls are now direct calls to ext2_* functions, and ext2fs-specific mount and inode structures have been introduced.
315 lines
8.6 KiB
C
315 lines
8.6 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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/ucred.h>
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#include <sys/vnode.h>
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#include <gnu/ext2fs/inode.h>
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#include <gnu/ext2fs/ext2_fs.h>
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#include <gnu/ext2fs/ext2_fs_sb.h>
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#include <gnu/ext2fs/fs.h>
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#include <gnu/ext2fs/ext2_extern.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, bn, size, cred, bpp, flags)
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register struct inode *ip;
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register daddr_t bn;
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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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register struct ext2_sb_info *fs;
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register daddr_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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daddr_t newb, lbn, *bap, pref;
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int osize, nsize, num, i, error;
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/*
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ext2_debug("ext2_balloc called (%d, %d, %d)\n",
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ip->i_number, (int)bn, (int)size);
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*/
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*bpp = NULL;
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if (bn < 0)
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return (EFBIG);
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fs = ip->i_e2fs;
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lbn = bn;
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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 (bn < NDADDR) {
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nb = ip->i_db[bn];
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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 >= (bn + 1) * fs->s_blocksize) {
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error = bread(vp, bn, fs->s_blocksize, 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, bn, 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 < (bn + 1) * fs->s_blocksize)
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nsize = fragroundup(fs, size);
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else
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nsize = fs->s_blocksize;
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error = ext2_alloc(ip, bn,
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ext2_blkpref(ip, bn, (int)bn, &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, bn, nsize, 0, 0);
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bp->b_blkno = fsbtodb(fs, newb);
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if (flags & B_CLRBUF)
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vfs_bio_clrbuf(bp);
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}
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ip->i_db[bn] = 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, bn, indirs, &num)) != 0)
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return(error);
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#if 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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#if 0
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pref = ext2_blkpref(ip, lbn, 0, (daddr_t *)0, 0);
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#else
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/* see the comment by ext2_blkpref. What we do here is
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to pretend that it'd be good for a block holding indirect
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pointers to be allocated near its predecessor in terms
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of indirection, or the last direct block.
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We shamelessly exploit the fact that i_ib immediately
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follows i_db.
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Godmar thinks it make sense to allocate i_ib[0] immediately
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after i_db[11], but it's not utterly clear whether this also
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applies to i_ib[1] and i_ib[0]
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*/
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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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#endif
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if ((error = ext2_alloc(ip, lbn, pref, (int)fs->s_blocksize,
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cred, &newb)) != 0)
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return (error);
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nb = newb;
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bp = getblk(vp, indirs[1].in_lbn, fs->s_blocksize, 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->s_blocksize);
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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->s_blocksize, 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 = (daddr_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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brelse(bp);
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continue;
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}
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if (pref == 0)
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#if 1
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/* see the comment above and by ext2_blkpref
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* I think this implements Linux policy, but
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* does it really make sense to allocate to
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* block containing pointers together ?
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* Also, will it ever succeed ?
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*/
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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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#else
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pref = ext2_blkpref(ip, lbn, 0, (daddr_t *)0, 0);
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#endif
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if ((error =
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ext2_alloc(ip, lbn, pref, (int)fs->s_blocksize, 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, indirs[i].in_lbn, fs->s_blocksize, 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->s_blocksize);
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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 & B_SYNC) {
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bwrite(bp);
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} else {
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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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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->s_blocksize, 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->s_blocksize, 0, 0);
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nbp->b_blkno = fsbtodb(fs, nb);
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if (flags & B_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 & B_SYNC) {
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bwrite(bp);
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} else {
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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 & B_CLRBUF) {
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error = bread(vp, lbn, (int)fs->s_blocksize, NOCRED, &nbp);
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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->s_blocksize, 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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