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Annotation of Net2/ufs/mfs_vfsops.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989, 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)mfs_vfsops.c        7.19 (Berkeley) 4/16/91
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "time.h"
        !            38: #include "kernel.h"
        !            39: #include "proc.h"
        !            40: #include "buf.h"
        !            41: #include "mount.h"
        !            42: #include "signalvar.h"
        !            43: #include "vnode.h"
        !            44: 
        !            45: #include "quota.h"
        !            46: #include "inode.h"
        !            47: #include "ufsmount.h"
        !            48: #include "mfsnode.h"
        !            49: #include "fs.h"
        !            50: 
        !            51: extern struct vnodeops mfs_vnodeops;
        !            52: 
        !            53: /*
        !            54:  * mfs vfs operations.
        !            55:  */
        !            56: int mfs_mount();
        !            57: int mfs_start();
        !            58: int ufs_unmount();
        !            59: int ufs_root();
        !            60: int ufs_quotactl();
        !            61: int mfs_statfs();
        !            62: int ufs_sync();
        !            63: int ufs_fhtovp();
        !            64: int ufs_vptofh();
        !            65: int mfs_init();
        !            66: 
        !            67: struct vfsops mfs_vfsops = {
        !            68:        mfs_mount,
        !            69:        mfs_start,
        !            70:        ufs_unmount,
        !            71:        ufs_root,
        !            72:        ufs_quotactl,
        !            73:        mfs_statfs,
        !            74:        ufs_sync,
        !            75:        ufs_fhtovp,
        !            76:        ufs_vptofh,
        !            77:        mfs_init,
        !            78: };
        !            79: 
        !            80: /*
        !            81:  * VFS Operations.
        !            82:  *
        !            83:  * mount system call
        !            84:  */
        !            85: /* ARGSUSED */
        !            86: mfs_mount(mp, path, data, ndp, p)
        !            87:        register struct mount *mp;
        !            88:        char *path;
        !            89:        caddr_t data;
        !            90:        struct nameidata *ndp;
        !            91:        struct proc *p;
        !            92: {
        !            93:        struct vnode *devvp;
        !            94:        struct mfs_args args;
        !            95:        struct ufsmount *ump;
        !            96:        register struct fs *fs;
        !            97:        register struct mfsnode *mfsp;
        !            98:        static int mfs_minor;
        !            99:        u_int size;
        !           100:        int error;
        !           101: 
        !           102:        if (mp->mnt_flag & MNT_UPDATE) {
        !           103:                ump = VFSTOUFS(mp);
        !           104:                fs = ump->um_fs;
        !           105:                if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
        !           106:                        fs->fs_ronly = 0;
        !           107:                return (0);
        !           108:        }
        !           109:        if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
        !           110:                return (error);
        !           111:        error = getnewvnode(VT_MFS, (struct mount *)0, &mfs_vnodeops, &devvp);
        !           112:        if (error)
        !           113:                return (error);
        !           114:        devvp->v_type = VBLK;
        !           115:        if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
        !           116:                panic("mfs_mount: dup dev");
        !           117:        mfsp = VTOMFS(devvp);
        !           118:        mfsp->mfs_baseoff = args.base;
        !           119:        mfsp->mfs_size = args.size;
        !           120:        mfsp->mfs_vnode = devvp;
        !           121:        mfsp->mfs_pid = p->p_pid;
        !           122:        mfsp->mfs_buflist = (struct buf *)0;
        !           123:        if (error = mountfs(devvp, mp)) {
        !           124:                mfsp->mfs_buflist = (struct buf *)-1;
        !           125:                vrele(devvp);
        !           126:                return (error);
        !           127:        }
        !           128:        ump = VFSTOUFS(mp);
        !           129:        fs = ump->um_fs;
        !           130:        (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
        !           131:        bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
        !           132:        bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
        !           133:                MNAMELEN);
        !           134:        (void) copyinstr(args.name, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
        !           135:                &size);
        !           136:        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        !           137:        (void) mfs_statfs(mp, &mp->mnt_stat);
        !           138:        return (0);
        !           139: }
        !           140: 
        !           141: int    mfs_pri = PWAIT | PCATCH;               /* XXX prob. temp */
        !           142: 
        !           143: /*
        !           144:  * Used to grab the process and keep it in the kernel to service
        !           145:  * memory filesystem I/O requests.
        !           146:  *
        !           147:  * Loop servicing I/O requests.
        !           148:  * Copy the requested data into or out of the memory filesystem
        !           149:  * address space.
        !           150:  */
        !           151: /* ARGSUSED */
        !           152: mfs_start(mp, flags, p)
        !           153:        struct mount *mp;
        !           154:        int flags;
        !           155:        struct proc *p;
        !           156: {
        !           157:        register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
        !           158:        register struct mfsnode *mfsp = VTOMFS(vp);
        !           159:        register struct buf *bp;
        !           160:        register caddr_t base;
        !           161:        int error = 0;
        !           162: 
        !           163:        base = mfsp->mfs_baseoff;
        !           164:        while (mfsp->mfs_buflist != (struct buf *)(-1)) {
        !           165:                while (bp = mfsp->mfs_buflist) {
        !           166:                        mfsp->mfs_buflist = bp->av_forw;
        !           167:                        mfs_doio(bp, base);
        !           168:                        wakeup((caddr_t)bp);
        !           169:                }
        !           170:                /*
        !           171:                 * If a non-ignored signal is received, try to unmount.
        !           172:                 * If that fails, clear the signal (it has been "processed"),
        !           173:                 * otherwise we will loop here, as tsleep will always return
        !           174:                 * EINTR/ERESTART.
        !           175:                 */
        !           176:                if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
        !           177:                        if (dounmount(mp, MNT_NOFORCE, p) != 0)
        !           178:                                CLRSIG(p, CURSIG(p));
        !           179:        }
        !           180:        return (error);
        !           181: }
        !           182: 
        !           183: /*
        !           184:  * Get file system statistics.
        !           185:  */
        !           186: mfs_statfs(mp, sbp, p)
        !           187:        struct mount *mp;
        !           188:        struct statfs *sbp;
        !           189:        struct proc *p;
        !           190: {
        !           191:        int error;
        !           192: 
        !           193:        error = ufs_statfs(mp, sbp, p);
        !           194:        sbp->f_type = MOUNT_MFS;
        !           195:        return (error);
        !           196: }

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