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Annotation of kernel/bsd/ufs/lfs/lfs_balloc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*     $NetBSD: lfs_balloc.c,v 1.2 1994/06/29 06:46:49 cgd Exp $       */
        !            26: 
        !            27: /*
        !            28:  * Copyright (c) 1989, 1991, 1993
        !            29:  *     The Regents of the University of California.  All rights reserved.
        !            30:  *
        !            31:  * Redistribution and use in source and binary forms, with or without
        !            32:  * modification, are permitted provided that the following conditions
        !            33:  * are met:
        !            34:  * 1. Redistributions of source code must retain the above copyright
        !            35:  *    notice, this list of conditions and the following disclaimer.
        !            36:  * 2. Redistributions in binary form must reproduce the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer in the
        !            38:  *    documentation and/or other materials provided with the distribution.
        !            39:  * 3. All advertising materials mentioning features or use of this software
        !            40:  *    must display the following acknowledgement:
        !            41:  *     This product includes software developed by the University of
        !            42:  *     California, Berkeley and its contributors.
        !            43:  * 4. Neither the name of the University nor the names of its contributors
        !            44:  *    may be used to endorse or promote products derived from this software
        !            45:  *    without specific prior written permission.
        !            46:  *
        !            47:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            48:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            49:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            50:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            51:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            52:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            53:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            54:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            55:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            56:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            57:  * SUCH DAMAGE.
        !            58:  *
        !            59:  *     @(#)lfs_balloc.c        8.1 (Berkeley) 6/11/93
        !            60:  */
        !            61: #include <sys/param.h>
        !            62: #include <sys/buf.h>
        !            63: #include <sys/proc.h>
        !            64: #include <sys/vnode.h>
        !            65: #include <sys/mount.h>
        !            66: #include <sys/resourcevar.h>
        !            67: #include <sys/trace.h>
        !            68: 
        !            69: #include <miscfs/specfs/specdev.h>
        !            70: 
        !            71: #include <ufs/ufs/quota.h>
        !            72: #include <ufs/ufs/inode.h>
        !            73: #include <ufs/ufs/ufsmount.h>
        !            74: 
        !            75: #include <ufs/lfs/lfs.h>
        !            76: #include <ufs/lfs/lfs_extern.h>
        !            77: 
        !            78: int
        !            79: lfs_balloc(vp, iosize, lbn, bpp)
        !            80:        struct vnode *vp;
        !            81:        u_long iosize;
        !            82:        daddr_t lbn;
        !            83:        struct buf **bpp;
        !            84: {
        !            85:        struct buf *ibp, *bp;
        !            86:        struct inode *ip;
        !            87:        struct lfs *fs;
        !            88:        struct indir indirs[NIADDR+2];
        !            89:        daddr_t daddr;
        !            90:        int bb, error, i, num;
        !            91: 
        !            92:        ip = VTOI(vp);
        !            93:        fs = ip->i_lfs;
        !            94: 
        !            95:        /* 
        !            96:         * Three cases: it's a block beyond the end of file, it's a block in
        !            97:         * the file that may or may not have been assigned a disk address or
        !            98:         * we're writing an entire block.  Note, if the daddr is unassigned,
        !            99:         * the block might still have existed in the cache (if it was read
        !           100:         * or written earlier).  If it did, make sure we don't count it as a
        !           101:         * new block or zero out its contents.  If it did not, make sure
        !           102:         * we allocate any necessary indirect blocks.
        !           103:         */
        !           104: 
        !           105:        *bpp = NULL;
        !           106:        if (error = ufs_bmaparray(vp, lbn, &daddr, &indirs[0], &num, NULL ))
        !           107:                return (error);
        !           108: 
        !           109:        *bpp = bp = getblk(vp, lbn, fs->lfs_bsize, 0, 0);
        !           110:        bb = VFSTOUFS(vp->v_mount)->um_seqinc;
        !           111:        if (daddr == UNASSIGNED)
        !           112:                /* May need to allocate indirect blocks */
        !           113:                for (i = 1; i < num; ++i)
        !           114:                        if (!indirs[i].in_exists) {
        !           115:                                ibp =
        !           116:                                    getblk(vp, indirs[i].in_lbn, fs->lfs_bsize,
        !           117:                                        0, 0);
        !           118:                                if (!(ibp->b_flags & (B_DONE | B_DELWRI))) {
        !           119:                                        if (!ISSPACE(fs, bb, curproc->p_ucred)){
        !           120:                                                ibp->b_flags |= B_INVAL;
        !           121:                                                brelse(ibp);
        !           122:                                                error = ENOSPC;
        !           123:                                        } else {
        !           124:                                                ip->i_blocks += bb;
        !           125:                                                ip->i_lfs->lfs_bfree -= bb;
        !           126:                                                clrbuf(ibp);
        !           127:                                                error = VOP_BWRITE(ibp);
        !           128:                                        }
        !           129:                                } else
        !           130:                                        panic ("Indirect block should not exist");
        !           131:                        }
        !           132:        if (error) {
        !           133:                if (bp)
        !           134:                        brelse(bp);
        !           135:                return(error);
        !           136:        }
        !           137: 
        !           138: 
        !           139:        /* Now, we may need to allocate the data block */
        !           140:        if (!(bp->b_flags & (B_CACHE | B_DONE | B_DELWRI))) {
        !           141:                if (daddr == UNASSIGNED) 
        !           142:                        if (!ISSPACE(fs, bb, curproc->p_ucred)) {
        !           143:                                bp->b_flags |= B_INVAL;
        !           144:                                brelse(bp);
        !           145:                                return(ENOSPC);
        !           146:                        } else {
        !           147:                                ip->i_blocks += bb;
        !           148:                                ip->i_lfs->lfs_bfree -= bb;
        !           149:                                if (iosize != fs->lfs_bsize)
        !           150:                                        clrbuf(bp);
        !           151:                        }
        !           152:                else if (iosize == fs->lfs_bsize)
        !           153:                        bp->b_blkno = daddr;            /* Skip the I/O */
        !           154:                else  {
        !           155:                        bp->b_blkno = daddr;
        !           156:                        bp->b_flags |= B_READ;
        !           157:                        VOP_STRATEGY(bp);
        !           158:                        return(biowait(bp));
        !           159:                }
        !           160:        }
        !           161:        return (error);
        !           162: }

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