1 /* $NetBSD: lfs_balloc.c,v 1.3 1996/02/09 22:28:48 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)lfs_balloc.c 8.1 (Berkeley) 6/11/93 36 */ 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/buf.h> 40 #include <sys/proc.h> 41 #include <sys/vnode.h> 42 #include <sys/mount.h> 43 #include <sys/resourcevar.h> 44 #include <sys/trace.h> 45 46 #include <miscfs/specfs/specdev.h> 47 48 #include <ufs/ufs/quota.h> 49 #include <ufs/ufs/inode.h> 50 #include <ufs/ufs/ufsmount.h> 51 #include <ufs/ufs/ufs_extern.h> 52 53 #include <ufs/lfs/lfs.h> 54 #include <ufs/lfs/lfs_extern.h> 55 56 int 57 lfs_balloc(vp, iosize, lbn, bpp) 58 struct vnode *vp; 59 u_long iosize; 60 daddr_t lbn; 61 struct buf **bpp; 62 { 63 struct buf *ibp, *bp; 64 struct inode *ip; 65 struct lfs *fs; 66 struct indir indirs[NIADDR+2]; 67 daddr_t daddr; 68 int bb, error, i, num; 69 70 ip = VTOI(vp); 71 fs = ip->i_lfs; 72 73 /* 74 * Three cases: it's a block beyond the end of file, it's a block in 75 * the file that may or may not have been assigned a disk address or 76 * we're writing an entire block. Note, if the daddr is unassigned, 77 * the block might still have existed in the cache (if it was read 78 * or written earlier). If it did, make sure we don't count it as a 79 * new block or zero out its contents. If it did not, make sure 80 * we allocate any necessary indirect blocks. 81 */ 82 83 *bpp = NULL; 84 error = ufs_bmaparray(vp, lbn, &daddr, &indirs[0], &num, NULL); 85 if (error) 86 return (error); 87 88 *bpp = bp = getblk(vp, lbn, fs->lfs_bsize, 0, 0); 89 bb = VFSTOUFS(vp->v_mount)->um_seqinc; 90 if (daddr == UNASSIGNED) 91 /* May need to allocate indirect blocks */ 92 for (i = 1; i < num; ++i) 93 if (!indirs[i].in_exists) { 94 ibp = 95 getblk(vp, indirs[i].in_lbn, fs->lfs_bsize, 96 0, 0); 97 if (!(ibp->b_flags & (B_DONE | B_DELWRI))) { 98 if (!ISSPACE(fs, bb, curproc->p_ucred)){ 99 ibp->b_flags |= B_INVAL; 100 brelse(ibp); 101 error = ENOSPC; 102 } else { 103 ip->i_blocks += bb; 104 ip->i_lfs->lfs_bfree -= bb; 105 clrbuf(ibp); 106 error = VOP_BWRITE(ibp); 107 } 108 } else 109 panic ("Indirect block should not exist"); 110 } 111 if (error) { 112 if (bp) 113 brelse(bp); 114 return(error); 115 } 116 117 118 /* Now, we may need to allocate the data block */ 119 if (!(bp->b_flags & (B_CACHE | B_DONE | B_DELWRI))) { 120 if (daddr == UNASSIGNED) 121 if (!ISSPACE(fs, bb, curproc->p_ucred)) { 122 bp->b_flags |= B_INVAL; 123 brelse(bp); 124 return(ENOSPC); 125 } else { 126 ip->i_blocks += bb; 127 ip->i_lfs->lfs_bfree -= bb; 128 if (iosize != fs->lfs_bsize) 129 clrbuf(bp); 130 } 131 else if (iosize == fs->lfs_bsize) 132 bp->b_blkno = daddr; /* Skip the I/O */ 133 else { 134 bp->b_blkno = daddr; 135 bp->b_flags |= B_READ; 136 VOP_STRATEGY(bp); 137 return(biowait(bp)); 138 } 139 } 140 return (error); 141 } 142