140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/*
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* Copyright (c) 1989, 1991, 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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* @(#)lfs_balloc.c 8.1 (Berkeley) 6/11/93
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* $Id: lfs_balloc.c,v 1.6 1995/04/09 06:03:41 davidg Exp $
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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/buf.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/resourcevar.h>
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#include <miscfs/specfs/specdev.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/lfs/lfs.h>
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#include <ufs/lfs/lfs_extern.h>
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int
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lfs_balloc(vp, iosize, lbn, bpp)
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struct vnode *vp;
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u_long iosize;
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daddr_t lbn;
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struct buf **bpp;
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{
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struct buf *ibp, *bp;
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struct inode *ip;
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struct lfs *fs;
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struct indir indirs[NIADDR+2];
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daddr_t daddr;
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int bb, error, i, num;
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ip = VTOI(vp);
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fs = ip->i_lfs;
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/*
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* Three cases: it's a block beyond the end of file, it's a block in
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* the file that may or may not have been assigned a disk address or
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* we're writing an entire block. Note, if the daddr is unassigned,
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* the block might still have existed in the cache (if it was read
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* or written earlier). If it did, make sure we don't count it as a
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* new block or zero out its contents. If it did not, make sure
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* we allocate any necessary indirect blocks.
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*/
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*bpp = NULL;
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if (error = ufs_bmaparray(vp, lbn, &daddr, &indirs[0], &num, NULL ))
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return (error);
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*bpp = bp = getblk(vp, lbn, fs->lfs_bsize, 0, 0);
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bb = VFSTOUFS(vp->v_mount)->um_seqinc;
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if (daddr == UNASSIGNED)
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/* May need to allocate indirect blocks */
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for (i = 1; i < num; ++i)
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if (!indirs[i].in_exists) {
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ibp =
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getblk(vp, indirs[i].in_lbn, fs->lfs_bsize,
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0, 0);
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if (!(ibp->b_flags & (B_DONE | B_DELWRI))) {
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if (!ISSPACE(fs, bb, curproc->p_ucred)){
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ibp->b_flags |= B_INVAL;
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brelse(ibp);
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error = ENOSPC;
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} else {
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ip->i_blocks += bb;
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ip->i_lfs->lfs_bfree -= bb;
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vfs_bio_clrbuf(ibp);
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error = VOP_BWRITE(ibp);
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}
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} else
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panic ("Indirect block should not exist");
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}
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if (error) {
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if (bp)
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brelse(bp);
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return(error);
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}
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/* Now, we may need to allocate the data block */
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if (!(bp->b_flags & (B_CACHE | B_DONE | B_DELWRI))) {
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if (daddr == UNASSIGNED)
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if (!ISSPACE(fs, bb, curproc->p_ucred)) {
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bp->b_flags |= B_INVAL;
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brelse(bp);
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return(ENOSPC);
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} else {
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ip->i_blocks += bb;
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ip->i_lfs->lfs_bfree -= bb;
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if (iosize != fs->lfs_bsize)
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vfs_bio_clrbuf(bp);
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}
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else if (iosize == fs->lfs_bsize)
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bp->b_blkno = daddr; /* Skip the I/O */
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else {
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bp->b_blkno = daddr;
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bp->b_flags |= B_READ;
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vfs_busy_pages(bp, 0);
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VOP_STRATEGY(bp);
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return(biowait(bp));
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}
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}
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return (error);
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}
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