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Annotation of XNU/bsd/miscfs/fdesc/fdesc_vfsops.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            23: /*
        !            24:  * Copyright (c) 1992, 1993, 1995
        !            25:  *     The Regents of the University of California.  All rights reserved.
        !            26:  *
        !            27:  * This code is derived from software donated to Berkeley by
        !            28:  * Jan-Simon Pendry.
        !            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:  *     @(#)fdesc_vfsops.c      8.10 (Berkeley) 5/14/95
        !            59:  *
        !            60:  */
        !            61: 
        !            62: /*
        !            63:  * /dev/fd Filesystem
        !            64:  */
        !            65: 
        !            66: #include <sys/param.h>
        !            67: #include <sys/systm.h>
        !            68: #include <sys/time.h>
        !            69: #include <sys/types.h>
        !            70: #include <sys/proc.h>
        !            71: #include <sys/resourcevar.h>
        !            72: #include <sys/filedesc.h>
        !            73: #include <sys/vnode.h>
        !            74: #include <sys/mount.h>
        !            75: #include <sys/namei.h>
        !            76: #include <sys/malloc.h>
        !            77: #include <miscfs/fdesc/fdesc.h>
        !            78: 
        !            79: /*
        !            80:  * Mount the per-process file descriptors (/dev/fd)
        !            81:  */
        !            82: int
        !            83: fdesc_mount(mp, path, data, ndp, p)
        !            84:        struct mount *mp;
        !            85:        char *path;
        !            86:        caddr_t data;
        !            87:        struct nameidata *ndp;
        !            88:        struct proc *p;
        !            89: {
        !            90:        int error = 0;
        !            91:        u_int size;
        !            92:        struct fdescmount *fmp;
        !            93:        struct vnode *rvp;
        !            94: 
        !            95:        /*
        !            96:         * Update is a no-op
        !            97:         */
        !            98:        if (mp->mnt_flag & MNT_UPDATE)
        !            99:                return (EOPNOTSUPP);
        !           100: 
        !           101:        error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
        !           102:        if (error)
        !           103:                return (error);
        !           104: 
        !           105:        MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
        !           106:                                M_UFSMNT, M_WAITOK);    /* XXX */
        !           107:        rvp->v_type = VDIR;
        !           108:        rvp->v_flag |= VROOT;
        !           109:        fmp->f_root = rvp;
        !           110:        /* XXX -- don't mark as local to work around fts() problems */
        !           111:        /*mp->mnt_flag |= MNT_LOCAL;*/
        !           112:        mp->mnt_data = (qaddr_t) fmp;
        !           113:        vfs_getnewfsid(mp);
        !           114: 
        !           115:        (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
        !           116:        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        !           117:        bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
        !           118:        bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
        !           119:        return (0);
        !           120: }
        !           121: 
        !           122: int
        !           123: fdesc_start(mp, flags, p)
        !           124:        struct mount *mp;
        !           125:        int flags;
        !           126:        struct proc *p;
        !           127: {
        !           128:        return (0);
        !           129: }
        !           130: 
        !           131: int
        !           132: fdesc_unmount(mp, mntflags, p)
        !           133:        struct mount *mp;
        !           134:        int mntflags;
        !           135:        struct proc *p;
        !           136: {
        !           137:        int error;
        !           138:        int flags = 0;
        !           139:        struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
        !           140: 
        !           141:        if (mntflags & MNT_FORCE)
        !           142:                flags |= FORCECLOSE;
        !           143: 
        !           144:        /*
        !           145:         * Clear out buffer cache.  I don't think we
        !           146:         * ever get anything cached at this level at the
        !           147:         * moment, but who knows...
        !           148:         */
        !           149:        if (rootvp->v_usecount > 1)
        !           150:                return (EBUSY);
        !           151:        if (error = vflush(mp, rootvp, flags))
        !           152:                return (error);
        !           153: 
        !           154:        /*
        !           155:         * Release reference on underlying root vnode
        !           156:         */
        !           157:        vrele(rootvp);
        !           158:        /*
        !           159:         * And blow it away for future re-use
        !           160:         */
        !           161:        vgone(rootvp);
        !           162:        /*
        !           163:         * Finally, throw away the fdescmount structure
        !           164:         */
        !           165:        _FREE(mp->mnt_data, M_UFSMNT);  /* XXX */
        !           166:        mp->mnt_data = 0;
        !           167: 
        !           168:        return (0);
        !           169: }
        !           170: 
        !           171: int
        !           172: fdesc_root(mp, vpp)
        !           173:        struct mount *mp;
        !           174:        struct vnode **vpp;
        !           175: {
        !           176:        struct proc *p = current_proc();        /* XXX */
        !           177:        struct vnode *vp;
        !           178: 
        !           179:        /*
        !           180:         * Return locked reference to root.
        !           181:         */
        !           182:        vp = VFSTOFDESC(mp)->f_root;
        !           183:        VREF(vp);
        !           184:        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        !           185:        *vpp = vp;
        !           186:        return (0);
        !           187: }
        !           188: 
        !           189: int
        !           190: fdesc_statfs(mp, sbp, p)
        !           191:        struct mount *mp;
        !           192:        struct statfs *sbp;
        !           193:        struct proc *p;
        !           194: {
        !           195:        struct filedesc *fdp;
        !           196:        int lim;
        !           197:        int i;
        !           198:        int last;
        !           199:        int freefd;
        !           200: 
        !           201:        /*
        !           202:         * Compute number of free file descriptors.
        !           203:         * [ Strange results will ensue if the open file
        !           204:         * limit is ever reduced below the current number
        !           205:         * of open files... ]
        !           206:         */
        !           207:        lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
        !           208:        fdp = p->p_fd;
        !           209:        last = min(fdp->fd_nfiles, lim);
        !           210:        freefd = 0;
        !           211:        for (i = fdp->fd_freefile; i < last; i++)
        !           212:                if (fdp->fd_ofiles[i] == NULL &&
        !           213:                                !(fdp->fd_ofileflags[i] & UF_RESERVED))
        !           214:                        freefd++;
        !           215: 
        !           216:        /*
        !           217:         * Adjust for the fact that the fdesc array may not
        !           218:         * have been fully allocated yet.
        !           219:         */
        !           220:        if (fdp->fd_nfiles < lim)
        !           221:                freefd += (lim - fdp->fd_nfiles);
        !           222: 
        !           223:        sbp->f_flags = 0;
        !           224:        sbp->f_bsize = DEV_BSIZE;
        !           225:        sbp->f_iosize = DEV_BSIZE;
        !           226:        sbp->f_blocks = 2;              /* 1K to keep df happy */
        !           227:        sbp->f_bfree = 0;
        !           228:        sbp->f_bavail = 0;
        !           229:        sbp->f_files = lim + 1;         /* Allow for "." */
        !           230:        sbp->f_ffree = freefd;          /* See comments above */
        !           231:        if (sbp != &mp->mnt_stat) {
        !           232:                sbp->f_type = mp->mnt_vfc->vfc_typenum;
        !           233:                bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
        !           234:                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
        !           235:                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        !           236:        }
        !           237:        return (0);
        !           238: }
        !           239: 
        !           240: int
        !           241: fdesc_sync(mp, waitfor)
        !           242:        struct mount *mp;
        !           243:        int waitfor;
        !           244: {
        !           245: 
        !           246:        return (0);
        !           247: }
        !           248: 
        !           249: #define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
        !           250:            struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp)
        !           251: #define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
        !           252:            struct proc *)))eopnotsupp)
        !           253: #define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
        !           254:            size_t, struct proc *)))eopnotsupp)
        !           255: #define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
        !           256:            eopnotsupp)
        !           257: #define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
        !           258: 
        !           259: struct vfsops fdesc_vfsops = {
        !           260:        fdesc_mount,
        !           261:        fdesc_start,
        !           262:        fdesc_unmount,
        !           263:        fdesc_root,
        !           264:        fdesc_quotactl,
        !           265:        fdesc_statfs,
        !           266:        fdesc_sync,
        !           267:        fdesc_vget,
        !           268:        fdesc_fhtovp,
        !           269:        fdesc_vptofh,
        !           270:        fdesc_init,
        !           271:        fdesc_sysctl,
        !           272: };

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