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Annotation of kernel/bsd/ufs/mfs/mfs_vfsops.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: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1989, 1990, 1993, 1994
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)mfs_vfsops.c        8.4 (Berkeley) 4/16/94
        !            59:  */
        !            60: 
        !            61: #include <sys/param.h>
        !            62: #include <sys/systm.h>
        !            63: #include <sys/time.h>
        !            64: #include <sys/kernel.h>
        !            65: #include <sys/proc.h>
        !            66: #include <sys/buf.h>
        !            67: #include <sys/mount.h>
        !            68: #include <sys/signalvar.h>
        !            69: #include <sys/vnode.h>
        !            70: #include <sys/malloc.h>
        !            71: 
        !            72: #include <ufs/ufs/quota.h>
        !            73: #include <ufs/ufs/inode.h>
        !            74: #include <ufs/ufs/ufsmount.h>
        !            75: #include <ufs/ufs/ufs_extern.h>
        !            76: 
        !            77: #include <ufs/ffs/fs.h>
        !            78: #include <ufs/ffs/ffs_extern.h>
        !            79: 
        !            80: #include <ufs/mfs/mfsnode.h>
        !            81: #include <ufs/mfs/mfs_extern.h>
        !            82: 
        !            83: caddr_t        mfs_rootbase;   /* address of mini-root in kernel virtual memory */
        !            84: u_long mfs_rootsize;   /* size of mini-root in bytes */
        !            85: 
        !            86: static int mfs_minor;  /* used for building internal dev_t */
        !            87: 
        !            88: extern int (**mfs_vnodeop_p)();
        !            89: 
        !            90: /*
        !            91:  * mfs vfs operations.
        !            92:  */
        !            93: struct vfsops mfs_vfsops = {
        !            94:        MOUNT_MFS,
        !            95:        mfs_mount,
        !            96:        mfs_start,
        !            97:        ffs_unmount,
        !            98:        ufs_root,
        !            99:        ufs_quotactl,
        !           100:        mfs_statfs,
        !           101:        ffs_sync,
        !           102:        ffs_vget,
        !           103:        ffs_fhtovp,
        !           104:        ffs_vptofh,
        !           105:        mfs_init,
        !           106: };
        !           107: 
        !           108: /*
        !           109:  * Called by main() when mfs is going to be mounted as root.
        !           110:  *
        !           111:  * Name is updated by mount(8) after booting.
        !           112:  */
        !           113: #define ROOTNAME       "mfs_root"
        !           114: 
        !           115: mfs_mountroot()
        !           116: {
        !           117:        extern struct vnode *rootvp;
        !           118:        register struct fs *fs;
        !           119:        register struct mount *mp;
        !           120:        struct proc *p = kernel_proc;   /* XXX - WMG*/
        !           121:        struct ufsmount *ump;
        !           122:        struct mfsnode *mfsp;
        !           123:        size_t size;
        !           124:        int error;
        !           125: 
        !           126:        /*
        !           127:         * Get vnodes for swapdev and rootdev.
        !           128:         */
        !           129: #if 0
        !           130:        if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
        !           131:                panic("mfs_mountroot: can't setup bdevvp's");
        !           132: #else
        !           133:        if ( bdevvp(rootdev, &rootvp))
        !           134:                panic("mfs_mountroot: can't setup bdevvp's");
        !           135: 
        !           136: #endif
        !           137:        MALLOC_ZONE(mp, struct mount *,
        !           138:                        sizeof(struct mount), M_MOUNT, M_WAITOK);
        !           139:        bzero((char *)mp, (u_long)sizeof(struct mount));
        !           140:        mp->mnt_op = &mfs_vfsops;
        !           141:        mp->mnt_flag = MNT_RDONLY;
        !           142:        MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
        !           143:        rootvp->v_data = mfsp;
        !           144:        rootvp->v_op = mfs_vnodeop_p;
        !           145:        rootvp->v_tag = VT_MFS;
        !           146:        mfsp->mfs_baseoff = mfs_rootbase;
        !           147:        mfsp->mfs_size = mfs_rootsize;
        !           148:        mfsp->mfs_vnode = rootvp;
        !           149:        mfsp->mfs_pid = p->p_pid;
        !           150:        mfsp->mfs_buflist = (struct buf *)0;
        !           151:        if (error = ffs_mountfs(rootvp, mp, p)) {
        !           152:                _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
        !           153:                _FREE(mfsp, M_MFSNODE);
        !           154:                return (error);
        !           155:        }
        !           156:        if (error = vfs_lock(mp)) {
        !           157:                (void)ffs_unmount(mp, 0, p);
        !           158:                _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
        !           159:                _FREE(mfsp, M_MFSNODE);
        !           160:                return (error);
        !           161:        }
        !           162:        CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
        !           163:        mp->mnt_vnodecovered = NULLVP;
        !           164:        ump = VFSTOUFS(mp);
        !           165:        fs = ump->um_fs;
        !           166:        bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
        !           167:        fs->fs_fsmnt[0] = '/';
        !           168:        bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
        !           169:        (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
        !           170:            &size);
        !           171:        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        !           172:        (void)ffs_statfs(mp, &mp->mnt_stat, p);
        !           173:        vfs_unlock(mp);
        !           174:        inittodr((time_t)0);
        !           175:        return (0);
        !           176: }
        !           177: 
        !           178: /*
        !           179:  * This is called early in boot to set the base address and size
        !           180:  * of the mini-root.
        !           181:  */
        !           182: mfs_initminiroot(base)
        !           183:        caddr_t base;
        !           184: {
        !           185:        struct fs *fs = (struct fs *)(base + SBOFF);
        !           186:        extern int (*mountroot)();
        !           187: 
        !           188:        /* check for valid super block */
        !           189:        if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
        !           190:            fs->fs_bsize < sizeof(struct fs))
        !           191:                return (0);
        !           192:        mountroot = mfs_mountroot;
        !           193:        mfs_rootbase = base;
        !           194:        mfs_rootsize = fs->fs_fsize * fs->fs_size;
        !           195:        rootdev = makedev(255, mfs_minor++);
        !           196:        return (mfs_rootsize);
        !           197: }
        !           198: 
        !           199: /*
        !           200:  * VFS Operations.
        !           201:  *
        !           202:  * mount system call
        !           203:  */
        !           204: /* ARGSUSED */
        !           205: int
        !           206: mfs_mount(mp, path, data, ndp, p)
        !           207:        register struct mount *mp;
        !           208:        char *path;
        !           209:        caddr_t data;
        !           210:        struct nameidata *ndp;
        !           211:        struct proc *p;
        !           212: {
        !           213:        struct vnode *devvp;
        !           214:        struct mfs_args args;
        !           215:        struct ufsmount *ump;
        !           216:        register struct fs *fs;
        !           217:        register struct mfsnode *mfsp;
        !           218:        size_t size;
        !           219:        int flags, error;
        !           220: 
        !           221:        if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
        !           222:                return (error);
        !           223: 
        !           224:        /*
        !           225:         * If updating, check whether changing from read-only to
        !           226:         * read/write; if there is no device name, that's all we do.
        !           227:         */
        !           228:        if (mp->mnt_flag & MNT_UPDATE) {
        !           229:                ump = VFSTOUFS(mp);
        !           230:                fs = ump->um_fs;
        !           231:                if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
        !           232:                        flags = WRITECLOSE;
        !           233:                        if (mp->mnt_flag & MNT_FORCE)
        !           234:                                flags |= FORCECLOSE;
        !           235:                        if (vfs_busy(mp))
        !           236:                                return (EBUSY);
        !           237:                        error = ffs_flushfiles(mp, flags, p);
        !           238:                        vfs_unbusy(mp);
        !           239:                        if (error)
        !           240:                                return (error);
        !           241:                }
        !           242:                if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR))
        !           243:                        fs->fs_ronly = 0;
        !           244: #ifdef EXPORTMFS
        !           245:                if (args.fspec == 0)
        !           246:                        return (vfs_export(mp, &ump->um_export, &args.export));
        !           247: #endif
        !           248:                return (0);
        !           249:        }
        !           250:        error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
        !           251:        if (error)
        !           252:                return (error);
        !           253:        devvp->v_type = VBLK;
        !           254:        if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
        !           255:                panic("mfs_mount: dup dev");
        !           256: //     mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
        !           257:        MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
        !           258:        devvp->v_data = mfsp;
        !           259:        mfsp->mfs_baseoff = args.base;
        !           260:        mfsp->mfs_size = args.size;
        !           261:        mfsp->mfs_vnode = devvp;
        !           262:        mfsp->mfs_pid = p->p_pid;
        !           263:        mfsp->mfs_buflist = (struct buf *)0;
        !           264:        if (error = ffs_mountfs(devvp, mp, p)) {
        !           265:                mfsp->mfs_buflist = (struct buf *)-1;
        !           266:                vrele(devvp);
        !           267:                return (error);
        !           268:        }
        !           269:        ump = VFSTOUFS(mp);
        !           270:        fs = ump->um_fs;
        !           271:        (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
        !           272:        bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
        !           273:        bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
        !           274:        (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
        !           275:            &size);
        !           276:        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        !           277:        return (0);
        !           278: }
        !           279: 
        !           280: int    mfs_pri = PWAIT | PCATCH;               /* XXX prob. temp */
        !           281: 
        !           282: /*
        !           283:  * Used to grab the process and keep it in the kernel to service
        !           284:  * memory filesystem I/O requests.
        !           285:  *
        !           286:  * Loop servicing I/O requests.
        !           287:  * Copy the requested data into or out of the memory filesystem
        !           288:  * address space.
        !           289:  */
        !           290: /* ARGSUSED */
        !           291: int
        !           292: mfs_start(mp, flags, p)
        !           293:        struct mount *mp;
        !           294:        int flags;
        !           295:        struct proc *p;
        !           296: {
        !           297:        register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
        !           298:        register struct mfsnode *mfsp = VTOMFS(vp);
        !           299:        register struct buf *bp;
        !           300:        register caddr_t base;
        !           301:        int error = 0;
        !           302: 
        !           303:        base = mfsp->mfs_baseoff;
        !           304:        while (mfsp->mfs_buflist != (struct buf *)(-1)) {
        !           305:                while (bp = mfsp->mfs_buflist) {
        !           306:                        mfsp->mfs_buflist = bp->b_actf;
        !           307:                        mfs_doio(bp, base);
        !           308:                        wakeup((caddr_t)bp);
        !           309:                }
        !           310:                /*
        !           311:                 * If a non-ignored signal is received, try to unmount.
        !           312:                 * If that fails, clear the signal (it has been "processed"),
        !           313:                 * otherwise we will loop here, as tsleep will always return
        !           314:                 * EINTR/ERESTART.
        !           315:                 */
        !           316:                if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
        !           317:                        if (dounmount(mp, 0, p) != 0)
        !           318:                                CLRSIG(p, CURSIG(p));
        !           319:        }
        !           320:        return (error);
        !           321: }
        !           322: 
        !           323: /*
        !           324:  * Get file system statistics.
        !           325:  */
        !           326: mfs_statfs(mp, sbp, p)
        !           327:        struct mount *mp;
        !           328:        struct statfs *sbp;
        !           329:        struct proc *p;
        !           330: {
        !           331:        int error;
        !           332: 
        !           333:        error = ffs_statfs(mp, sbp, p);
        !           334: #ifdef COMPAT_09
        !           335:        sbp->f_type = 3;
        !           336: #else
        !           337:        sbp->f_type = 0;
        !           338: #endif
        !           339:        strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
        !           340:        sbp->f_fstypename[MFSNAMELEN] = '\0';
        !           341:        return (error);
        !           342: }

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