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/* $NetBSD: lfs_balloc.c,v 1.2 1994/06/29 06:46:49 cgd Exp $ */
/*
* Copyright (c) 1989, 1991, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)lfs_balloc.c 8.1 (Berkeley) 6/11/93
*/
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/resourcevar.h>
#include <sys/trace.h>
#include <miscfs/specfs/specdev.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>
int
lfs_balloc(vp, iosize, lbn, bpp)
struct vnode *vp;
u_long iosize;
daddr_t lbn;
struct buf **bpp;
{
struct buf *ibp, *bp;
struct inode *ip;
struct lfs *fs;
struct indir indirs[NIADDR+2];
daddr_t daddr;
int bb, error, i, num;
ip = VTOI(vp);
fs = ip->i_lfs;
/*
* Three cases: it's a block beyond the end of file, it's a block in
* the file that may or may not have been assigned a disk address or
* we're writing an entire block. Note, if the daddr is unassigned,
* the block might still have existed in the cache (if it was read
* or written earlier). If it did, make sure we don't count it as a
* new block or zero out its contents. If it did not, make sure
* we allocate any necessary indirect blocks.
*/
*bpp = NULL;
if (error = ufs_bmaparray(vp, lbn, &daddr, &indirs[0], &num, NULL ))
return (error);
*bpp = bp = getblk(vp, lbn, fs->lfs_bsize, 0, 0);
bb = VFSTOUFS(vp->v_mount)->um_seqinc;
if (daddr == UNASSIGNED)
/* May need to allocate indirect blocks */
for (i = 1; i < num; ++i)
if (!indirs[i].in_exists) {
ibp =
getblk(vp, indirs[i].in_lbn, fs->lfs_bsize,
0, 0);
if (!(ibp->b_flags & (B_DONE | B_DELWRI))) {
if (!ISSPACE(fs, bb, curproc->p_ucred)){
ibp->b_flags |= B_INVAL;
brelse(ibp);
error = ENOSPC;
} else {
ip->i_blocks += bb;
ip->i_lfs->lfs_bfree -= bb;
clrbuf(ibp);
error = VOP_BWRITE(ibp);
}
} else
panic ("Indirect block should not exist");
}
if (error) {
if (bp)
brelse(bp);
return(error);
}
/* Now, we may need to allocate the data block */
if (!(bp->b_flags & (B_CACHE | B_DONE | B_DELWRI))) {
if (daddr == UNASSIGNED)
if (!ISSPACE(fs, bb, curproc->p_ucred)) {
bp->b_flags |= B_INVAL;
brelse(bp);
return(ENOSPC);
} else {
ip->i_blocks += bb;
ip->i_lfs->lfs_bfree -= bb;
if (iosize != fs->lfs_bsize)
clrbuf(bp);
}
else if (iosize == fs->lfs_bsize)
bp->b_blkno = daddr; /* Skip the I/O */
else {
bp->b_blkno = daddr;
bp->b_flags |= B_READ;
VOP_STRATEGY(bp);
return(biowait(bp));
}
}
return (error);
}
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