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Annotation of 43BSDReno/sys/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)mfs_vfsops.c        7.17 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "param.h"
        !            24: #include "time.h"
        !            25: #include "kernel.h"
        !            26: #include "user.h"
        !            27: #include "proc.h"
        !            28: #include "buf.h"
        !            29: #include "mount.h"
        !            30: #include "vnode.h"
        !            31: #include "../ufs/quota.h"
        !            32: #include "../ufs/inode.h"
        !            33: #include "../ufs/ufsmount.h"
        !            34: #include "../ufs/mfsnode.h"
        !            35: #include "../ufs/fs.h"
        !            36: 
        !            37: extern struct vnodeops mfs_vnodeops;
        !            38: 
        !            39: /*
        !            40:  * mfs vfs operations.
        !            41:  */
        !            42: int mfs_mount();
        !            43: int mfs_start();
        !            44: int ufs_unmount();
        !            45: int ufs_root();
        !            46: int ufs_quotactl();
        !            47: int mfs_statfs();
        !            48: int ufs_sync();
        !            49: int ufs_fhtovp();
        !            50: int ufs_vptofh();
        !            51: int mfs_init();
        !            52: 
        !            53: struct vfsops mfs_vfsops = {
        !            54:        mfs_mount,
        !            55:        mfs_start,
        !            56:        ufs_unmount,
        !            57:        ufs_root,
        !            58:        ufs_quotactl,
        !            59:        mfs_statfs,
        !            60:        ufs_sync,
        !            61:        ufs_fhtovp,
        !            62:        ufs_vptofh,
        !            63:        mfs_init,
        !            64: };
        !            65: 
        !            66: /*
        !            67:  * VFS Operations.
        !            68:  *
        !            69:  * mount system call
        !            70:  */
        !            71: /* ARGSUSED */
        !            72: mfs_mount(mp, path, data, ndp)
        !            73:        register struct mount *mp;
        !            74:        char *path;
        !            75:        caddr_t data;
        !            76:        struct nameidata *ndp;
        !            77: {
        !            78:        struct vnode *devvp;
        !            79:        struct mfs_args args;
        !            80:        struct ufsmount *ump;
        !            81:        register struct fs *fs;
        !            82:        register struct mfsnode *mfsp;
        !            83:        static int mfs_minor;
        !            84:        u_int size;
        !            85:        int error;
        !            86: 
        !            87:        if (mp->mnt_flag & MNT_UPDATE) {
        !            88:                ump = VFSTOUFS(mp);
        !            89:                fs = ump->um_fs;
        !            90:                if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
        !            91:                        fs->fs_ronly = 0;
        !            92:                return (0);
        !            93:        }
        !            94:        if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
        !            95:                return (error);
        !            96:        error = getnewvnode(VT_MFS, (struct mount *)0, &mfs_vnodeops, &devvp);
        !            97:        if (error)
        !            98:                return (error);
        !            99:        devvp->v_type = VBLK;
        !           100:        if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
        !           101:                panic("mfs_mount: dup dev");
        !           102:        mfsp = VTOMFS(devvp);
        !           103:        mfsp->mfs_baseoff = args.base;
        !           104:        mfsp->mfs_size = args.size;
        !           105:        mfsp->mfs_vnode = devvp;
        !           106:        mfsp->mfs_pid = u.u_procp->p_pid;
        !           107:        mfsp->mfs_buflist = (struct buf *)0;
        !           108:        if (error = mountfs(devvp, mp)) {
        !           109:                mfsp->mfs_buflist = (struct buf *)-1;
        !           110:                vrele(devvp);
        !           111:                return (error);
        !           112:        }
        !           113:        ump = VFSTOUFS(mp);
        !           114:        fs = ump->um_fs;
        !           115:        (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
        !           116:        bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
        !           117:        bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
        !           118:                MNAMELEN);
        !           119:        (void) copyinstr(args.name, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
        !           120:                &size);
        !           121:        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        !           122:        (void) mfs_statfs(mp, &mp->mnt_stat);
        !           123:        return (0);
        !           124: }
        !           125: 
        !           126: int    mfs_pri = PWAIT | PCATCH;               /* XXX prob. temp */
        !           127: 
        !           128: /*
        !           129:  * Used to grab the process and keep it in the kernel to service
        !           130:  * memory filesystem I/O requests.
        !           131:  *
        !           132:  * Loop servicing I/O requests.
        !           133:  * Copy the requested data into or out of the memory filesystem
        !           134:  * address space.
        !           135:  */
        !           136: /* ARGSUSED */
        !           137: mfs_start(mp, flags)
        !           138:        struct mount *mp;
        !           139:        int flags;
        !           140: {
        !           141:        register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
        !           142:        register struct mfsnode *mfsp = VTOMFS(vp);
        !           143:        register struct buf *bp;
        !           144:        register caddr_t base;
        !           145:        struct proc *p = u.u_procp;
        !           146:        int error = 0;
        !           147: 
        !           148:        base = mfsp->mfs_baseoff;
        !           149:        while (mfsp->mfs_buflist != (struct buf *)(-1)) {
        !           150:                while (bp = mfsp->mfs_buflist) {
        !           151:                        mfsp->mfs_buflist = bp->av_forw;
        !           152:                        mfs_doio(bp, base);
        !           153:                        wakeup((caddr_t)bp);
        !           154:                }
        !           155:                /*
        !           156:                 * If a non-ignored signal is received, try to unmount.
        !           157:                 * If that fails, clear the signal (it has been "processed"),
        !           158:                 * otherwise we will loop here, as tsleep will always return
        !           159:                 * EINTR/ERESTART.
        !           160:                 */
        !           161:                if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
        !           162:                        if (dounmount(mp, MNT_NOFORCE) != 0)
        !           163:                                CLRSIG(p, CURSIG(p));
        !           164:        }
        !           165:        return (error);
        !           166: }
        !           167: 
        !           168: /*
        !           169:  * Get file system statistics.
        !           170:  */
        !           171: mfs_statfs(mp, sbp)
        !           172:        struct mount *mp;
        !           173:        struct statfs *sbp;
        !           174: {
        !           175:        int error;
        !           176: 
        !           177:        error = ufs_statfs(mp, sbp);
        !           178:        sbp->f_type = MOUNT_MFS;
        !           179:        return (error);
        !           180: }

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