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Annotation of kernel/bsd/ufs/mfs/mfs_vnops.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: mfs_vnops.c,v 1.5 1994/12/14 13:03:52 mycroft Exp $    */
        !            26: 
        !            27: /*
        !            28:  * Copyright (c) 1989, 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:  *     @(#)mfs_vnops.c 8.5 (Berkeley) 7/28/94
        !            60:  */
        !            61: 
        !            62: #include <sys/param.h>
        !            63: #include <sys/systm.h>
        !            64: #include <sys/time.h>
        !            65: #include <sys/kernel.h>
        !            66: #include <sys/proc.h>
        !            67: #include <sys/buf.h>
        !            68: #include <sys/map.h>
        !            69: #include <sys/vnode.h>
        !            70: #include <sys/malloc.h>
        !            71: 
        !            72: #include <miscfs/specfs/specdev.h>
        !            73: 
        !            74: #include <machine/vmparam.h>
        !            75: 
        !            76: #include <ufs/mfs/mfsnode.h>
        !            77: #include <ufs/mfs/mfsiom.h>
        !            78: #include <ufs/mfs/mfs_extern.h>
        !            79: 
        !            80: /*
        !            81:  * mfs vnode operations.
        !            82:  */
        !            83: int (**mfs_vnodeop_p)();
        !            84: struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
        !            85:        { &vop_default_desc, vn_default_error },
        !            86:        { &vop_lookup_desc, mfs_lookup },               /* lookup */
        !            87:        { &vop_create_desc, mfs_create },               /* create */
        !            88:        { &vop_mknod_desc, mfs_mknod },                 /* mknod */
        !            89:        { &vop_open_desc, mfs_open },                   /* open */
        !            90:        { &vop_close_desc, mfs_close },                 /* close */
        !            91:        { &vop_access_desc, mfs_access },               /* access */
        !            92:        { &vop_getattr_desc, mfs_getattr },             /* getattr */
        !            93:        { &vop_setattr_desc, mfs_setattr },             /* setattr */
        !            94:        { &vop_read_desc, mfs_read },                   /* read */
        !            95:        { &vop_write_desc, mfs_write },                 /* write */
        !            96:        { &vop_ioctl_desc, mfs_ioctl },                 /* ioctl */
        !            97:        { &vop_select_desc, mfs_select },               /* select */
        !            98:        { &vop_mmap_desc, mfs_mmap },                   /* mmap */
        !            99:        { &vop_fsync_desc, spec_fsync },                /* fsync */
        !           100:        { &vop_seek_desc, mfs_seek },                   /* seek */
        !           101:        { &vop_remove_desc, mfs_remove },               /* remove */
        !           102:        { &vop_link_desc, mfs_link },                   /* link */
        !           103:        { &vop_rename_desc, mfs_rename },               /* rename */
        !           104:        { &vop_mkdir_desc, mfs_mkdir },                 /* mkdir */
        !           105:        { &vop_rmdir_desc, mfs_rmdir },                 /* rmdir */
        !           106:        { &vop_symlink_desc, mfs_symlink },             /* symlink */
        !           107:        { &vop_readdir_desc, mfs_readdir },             /* readdir */
        !           108:        { &vop_readlink_desc, mfs_readlink },           /* readlink */
        !           109:        { &vop_abortop_desc, mfs_abortop },             /* abortop */
        !           110:        { &vop_inactive_desc, mfs_inactive },           /* inactive */
        !           111:        { &vop_reclaim_desc, mfs_reclaim },             /* reclaim */
        !           112:        { &vop_lock_desc, mfs_lock },                   /* lock */
        !           113:        { &vop_unlock_desc, mfs_unlock },               /* unlock */
        !           114:        { &vop_bmap_desc, mfs_bmap },                   /* bmap */
        !           115:        { &vop_strategy_desc, mfs_strategy },           /* strategy */
        !           116:        { &vop_print_desc, mfs_print },                 /* print */
        !           117:        { &vop_islocked_desc, mfs_islocked },           /* islocked */
        !           118:        { &vop_pathconf_desc, mfs_pathconf },           /* pathconf */
        !           119:        { &vop_advlock_desc, mfs_advlock },             /* advlock */
        !           120:        { &vop_blkatoff_desc, mfs_blkatoff },           /* blkatoff */
        !           121:        { &vop_valloc_desc, mfs_valloc },               /* valloc */
        !           122:        { &vop_vfree_desc, mfs_vfree },                 /* vfree */
        !           123:        { &vop_truncate_desc, mfs_truncate },           /* truncate */
        !           124:        { &vop_update_desc, mfs_update },               /* update */
        !           125:        { &vop_bwrite_desc, mfs_bwrite },               /* bwrite */
        !           126:        { &vop_pgrd_desc, mfs_pgrg },                   /* pager read */
        !           127:        { &vop_pgwr_desc, mfs_pgwr },                   /* pager write */
        !           128:        { (struct vnodeop_desc*)NULL, (int(*)())NULL }
        !           129: };
        !           130: struct vnodeopv_desc mfs_vnodeop_opv_desc =
        !           131:        { &mfs_vnodeop_p, mfs_vnodeop_entries };
        !           132: 
        !           133: /*
        !           134:  * Vnode Operations.
        !           135:  *
        !           136:  * Open called to allow memory filesystem to initialize and
        !           137:  * validate before actual IO. Record our process identifier
        !           138:  * so we can tell when we are doing I/O to ourself.
        !           139:  */
        !           140: /* ARGSUSED */
        !           141: int
        !           142: mfs_open(ap)
        !           143:        struct vop_open_args /* {
        !           144:                struct vnode *a_vp;
        !           145:                int  a_mode;
        !           146:                struct ucred *a_cred;
        !           147:                struct proc *a_p;
        !           148:        } */ *ap;
        !           149: {
        !           150: 
        !           151:        if (ap->a_vp->v_type != VBLK) {
        !           152:                panic("mfs_ioctl not VBLK");
        !           153:                /* NOTREACHED */
        !           154:        }
        !           155:        return (0);
        !           156: }
        !           157: 
        !           158: /*
        !           159:  * Ioctl operation.
        !           160:  */
        !           161: /* ARGSUSED */
        !           162: int
        !           163: mfs_ioctl(ap)
        !           164:        struct vop_ioctl_args /* {
        !           165:                struct vnode *a_vp;
        !           166:                u_long a_command;
        !           167:                caddr_t  a_data;
        !           168:                int  a_fflag;
        !           169:                struct ucred *a_cred;
        !           170:                struct proc *a_p;
        !           171:        } */ *ap;
        !           172: {
        !           173: 
        !           174:        return (ENOTTY);
        !           175: }
        !           176: 
        !           177: /*
        !           178:  * Pass I/O requests to the memory filesystem process.
        !           179:  */
        !           180: int
        !           181: mfs_strategy(ap)
        !           182:        struct vop_strategy_args /* {
        !           183:                struct buf *a_bp;
        !           184:        } */ *ap;
        !           185: {
        !           186:        register struct buf *bp = ap->a_bp;
        !           187:        register struct mfsnode *mfsp;
        !           188:        struct vnode *vp;
        !           189:        struct proc *p = curproc;               /* XXX */
        !           190: 
        !           191:        if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
        !           192:                panic("mfs_strategy: bad dev");
        !           193:        mfsp = VTOMFS(vp);
        !           194:        /* check for mini-root access */
        !           195:        if (mfsp->mfs_pid == 0) {
        !           196:                caddr_t base;
        !           197: 
        !           198:                base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
        !           199:                if (bp->b_flags & B_READ)
        !           200:                        bcopy(base, bp->b_data, bp->b_bcount);
        !           201:                else
        !           202:                        bcopy(bp->b_data, base, bp->b_bcount);
        !           203:                biodone(bp);
        !           204:        } else if (mfsp->mfs_pid == p->p_pid) {
        !           205:                mfs_doio(bp, mfsp->mfs_baseoff);
        !           206:        } else {
        !           207:                bp->b_actf = mfsp->mfs_buflist;
        !           208:                mfsp->mfs_buflist = bp;
        !           209:                wakeup((caddr_t)vp);
        !           210:        }
        !           211:        return (0);
        !           212: }
        !           213: 
        !           214: /*
        !           215:  * Memory file system I/O.
        !           216:  *
        !           217:  * Trivial on the HP since buffer has already been mapping into KVA space.
        !           218:  */
        !           219: void
        !           220: mfs_doio(bp, base)
        !           221:        register struct buf *bp;
        !           222:        caddr_t base;
        !           223: {
        !           224: 
        !           225:        base += (bp->b_blkno << DEV_BSHIFT);
        !           226:        if (bp->b_flags & B_READ)
        !           227:                bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
        !           228:        else
        !           229:                bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
        !           230:        if (bp->b_error)
        !           231:                bp->b_flags |= B_ERROR;
        !           232:        biodone(bp);
        !           233: }
        !           234: 
        !           235: /*
        !           236:  * This is a noop, simply returning what one has been given.
        !           237:  */
        !           238: int
        !           239: mfs_bmap(ap)
        !           240:        struct vop_bmap_args /* {
        !           241:                struct vnode *a_vp;
        !           242:                daddr_t  a_bn;
        !           243:                struct vnode **a_vpp;
        !           244:                daddr_t *a_bnp;
        !           245:                int *a_runp;
        !           246:        } */ *ap;
        !           247: {
        !           248: 
        !           249:        if (ap->a_vpp != NULL)
        !           250:                *ap->a_vpp = ap->a_vp;
        !           251:        if (ap->a_bnp != NULL)
        !           252:                *ap->a_bnp = ap->a_bn;
        !           253:        return (0);
        !           254: }
        !           255: 
        !           256: /*
        !           257:  * Memory filesystem close routine
        !           258:  */
        !           259: /* ARGSUSED */
        !           260: int
        !           261: mfs_close(ap)
        !           262:        struct vop_close_args /* {
        !           263:                struct vnode *a_vp;
        !           264:                int  a_fflag;
        !           265:                struct ucred *a_cred;
        !           266:                struct proc *a_p;
        !           267:        } */ *ap;
        !           268: {
        !           269:        register struct vnode *vp = ap->a_vp;
        !           270:        register struct mfsnode *mfsp = VTOMFS(vp);
        !           271:        register struct buf *bp;
        !           272:        int error;
        !           273: 
        !           274:        /*
        !           275:         * Finish any pending I/O requests.
        !           276:         */
        !           277:        while (bp = mfsp->mfs_buflist) {
        !           278:                mfsp->mfs_buflist = bp->b_actf;
        !           279:                mfs_doio(bp, mfsp->mfs_baseoff);
        !           280:                wakeup((caddr_t)bp);
        !           281:        }
        !           282:        /*
        !           283:         * On last close of a memory filesystem
        !           284:         * we must invalidate any in core blocks, so that
        !           285:         * we can, free up its vnode.
        !           286:         */
        !           287:        if (error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0))
        !           288:                return (error);
        !           289:        /*
        !           290:         * There should be no way to have any more uses of this
        !           291:         * vnode, so if we find any other uses, it is a panic.
        !           292:         */
        !           293:        if (vp->v_usecount > 1)
        !           294:                printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
        !           295:        if (vp->v_usecount > 1 || mfsp->mfs_buflist)
        !           296:                panic("mfs_close");
        !           297:        /*
        !           298:         * Send a request to the filesystem server to exit.
        !           299:         */
        !           300:        mfsp->mfs_buflist = (struct buf *)(-1);
        !           301:        wakeup((caddr_t)vp);
        !           302:        return (0);
        !           303: }
        !           304: 
        !           305: /*
        !           306:  * Memory filesystem inactive routine
        !           307:  */
        !           308: /* ARGSUSED */
        !           309: int
        !           310: mfs_inactive(ap)
        !           311:        struct vop_inactive_args /* {
        !           312:                struct vnode *a_vp;
        !           313:        } */ *ap;
        !           314: {
        !           315:        register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
        !           316: 
        !           317:        if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
        !           318:                panic("mfs_inactive: not inactive (mfs_buflist %x)",
        !           319:                        mfsp->mfs_buflist);
        !           320:        return (0);
        !           321: }
        !           322: 
        !           323: /*
        !           324:  * Reclaim a memory filesystem devvp so that it can be reused.
        !           325:  */
        !           326: int
        !           327: mfs_reclaim(ap)
        !           328:        struct vop_reclaim_args /* {
        !           329:                struct vnode *a_vp;
        !           330:        } */ *ap;
        !           331: {
        !           332:        register struct vnode *vp = ap->a_vp;
        !           333: 
        !           334:        FREE(vp->v_data, M_MFSNODE);
        !           335:        vp->v_data = NULL;
        !           336:        return (0);
        !           337: }
        !           338: 
        !           339: /*
        !           340:  * Print out the contents of an mfsnode.
        !           341:  */
        !           342: int
        !           343: mfs_print(ap)
        !           344:        struct vop_print_args /* {
        !           345:                struct vnode *a_vp;
        !           346:        } */ *ap;
        !           347: {
        !           348:        register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
        !           349: 
        !           350:        printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
        !           351:                mfsp->mfs_baseoff, mfsp->mfs_size);
        !           352:        return (0);
        !           353: }
        !           354: 
        !           355: /*
        !           356:  * Block device bad operation
        !           357:  */
        !           358: int
        !           359: mfs_badop()
        !           360: {
        !           361: 
        !           362:        panic("mfs_badop called\n");
        !           363:        /* NOTREACHED */
        !           364: }
        !           365: 
        !           366: /*
        !           367:  * Memory based filesystem initialization.
        !           368:  */
        !           369: mfs_init()
        !           370: {
        !           371: 
        !           372: }

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