fdesc_vfsops.c revision 1.21
1 /* $NetBSD: fdesc_vfsops.c,v 1.21 1996/02/09 22:40:07 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94 39 * 40 * #Id: fdesc_vfsops.c,v 1.9 1993/04/06 15:28:33 jsp Exp # 41 */ 42 43 /* 44 * /dev/fd Filesystem 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/time.h> 50 #include <sys/types.h> 51 #include <sys/proc.h> 52 #include <sys/resourcevar.h> 53 #include <sys/filedesc.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/namei.h> 57 #include <sys/malloc.h> 58 #include <miscfs/fdesc/fdesc.h> 59 60 int fdesc_mount __P((struct mount *, char *, caddr_t, 61 struct nameidata *, struct proc *)); 62 int fdesc_start __P((struct mount *, int, struct proc *)); 63 int fdesc_unmount __P((struct mount *, int, struct proc *)); 64 int fdesc_root __P((struct mount *, struct vnode **)); 65 int fdesc_quotactl __P((struct mount *, int, uid_t, caddr_t, 66 struct proc *)); 67 int fdesc_statfs __P((struct mount *, struct statfs *, struct proc *)); 68 int fdesc_sync __P((struct mount *, int, struct ucred *, struct proc *)); 69 int fdesc_vget __P((struct mount *, ino_t, struct vnode **)); 70 int fdesc_fhtovp __P((struct mount *, struct fid *, struct mbuf *, 71 struct vnode **, int *, struct ucred **)); 72 int fdesc_vptofh __P((struct vnode *, struct fid *)); 73 74 /* 75 * Mount the per-process file descriptors (/dev/fd) 76 */ 77 int 78 fdesc_mount(mp, path, data, ndp, p) 79 struct mount *mp; 80 char *path; 81 caddr_t data; 82 struct nameidata *ndp; 83 struct proc *p; 84 { 85 int error = 0; 86 size_t size; 87 struct fdescmount *fmp; 88 struct vnode *rvp; 89 90 /* 91 * Update is a no-op 92 */ 93 if (mp->mnt_flag & MNT_UPDATE) 94 return (EOPNOTSUPP); 95 96 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp); 97 if (error) 98 return (error); 99 100 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), 101 M_UFSMNT, M_WAITOK); /* XXX */ 102 rvp->v_type = VDIR; 103 rvp->v_flag |= VROOT; 104 fmp->f_root = rvp; 105 mp->mnt_flag |= MNT_LOCAL; 106 mp->mnt_data = (qaddr_t)fmp; 107 getnewfsid(mp, makefstype(MOUNT_FDESC)); 108 109 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 110 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 111 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 112 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc")); 113 return (0); 114 } 115 116 int 117 fdesc_start(mp, flags, p) 118 struct mount *mp; 119 int flags; 120 struct proc *p; 121 { 122 return (0); 123 } 124 125 int 126 fdesc_unmount(mp, mntflags, p) 127 struct mount *mp; 128 int mntflags; 129 struct proc *p; 130 { 131 int error; 132 int flags = 0; 133 extern int doforce; 134 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 135 136 if (mntflags & MNT_FORCE) { 137 /* fdesc can never be rootfs so don't check for it */ 138 if (!doforce) 139 return (EINVAL); 140 flags |= FORCECLOSE; 141 } 142 143 /* 144 * Clear out buffer cache. I don't think we 145 * ever get anything cached at this level at the 146 * moment, but who knows... 147 */ 148 if (rootvp->v_usecount > 1) 149 return (EBUSY); 150 if ((error = vflush(mp, rootvp, flags)) != 0) 151 return (error); 152 153 /* 154 * Release reference on underlying root vnode 155 */ 156 vrele(rootvp); 157 /* 158 * And blow it away for future re-use 159 */ 160 vgone(rootvp); 161 /* 162 * Finally, throw away the fdescmount structure 163 */ 164 free(mp->mnt_data, M_UFSMNT); /* XXX */ 165 mp->mnt_data = 0; 166 167 return (0); 168 } 169 170 int 171 fdesc_root(mp, vpp) 172 struct mount *mp; 173 struct vnode **vpp; 174 { 175 struct vnode *vp; 176 177 /* 178 * Return locked reference to root. 179 */ 180 vp = VFSTOFDESC(mp)->f_root; 181 VREF(vp); 182 VOP_LOCK(vp); 183 *vpp = vp; 184 return (0); 185 } 186 187 int 188 fdesc_quotactl(mp, cmd, uid, arg, p) 189 struct mount *mp; 190 int cmd; 191 uid_t uid; 192 caddr_t arg; 193 struct proc *p; 194 { 195 196 return (EOPNOTSUPP); 197 } 198 199 int 200 fdesc_statfs(mp, sbp, p) 201 struct mount *mp; 202 struct statfs *sbp; 203 struct proc *p; 204 { 205 struct filedesc *fdp; 206 int lim; 207 int i; 208 int last; 209 int freefd; 210 211 /* 212 * Compute number of free file descriptors. 213 * [ Strange results will ensue if the open file 214 * limit is ever reduced below the current number 215 * of open files... ] 216 */ 217 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 218 fdp = p->p_fd; 219 last = min(fdp->fd_nfiles, lim); 220 freefd = 0; 221 for (i = fdp->fd_freefile; i < last; i++) 222 if (fdp->fd_ofiles[i] == NULL) 223 freefd++; 224 225 /* 226 * Adjust for the fact that the fdesc array may not 227 * have been fully allocated yet. 228 */ 229 if (fdp->fd_nfiles < lim) 230 freefd += (lim - fdp->fd_nfiles); 231 232 #ifdef COMPAT_09 233 sbp->f_type = 6; 234 #else 235 sbp->f_type = 0; 236 #endif 237 sbp->f_bsize = DEV_BSIZE; 238 sbp->f_iosize = DEV_BSIZE; 239 sbp->f_blocks = 2; /* 1K to keep df happy */ 240 sbp->f_bfree = 0; 241 sbp->f_bavail = 0; 242 sbp->f_files = lim + 1; /* Allow for "." */ 243 sbp->f_ffree = freefd; /* See comments above */ 244 if (sbp != &mp->mnt_stat) { 245 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 246 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 247 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 248 } 249 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 250 return (0); 251 } 252 253 /*ARGSUSED*/ 254 int 255 fdesc_sync(mp, waitfor, uc, p) 256 struct mount *mp; 257 int waitfor; 258 struct ucred *uc; 259 struct proc *p; 260 { 261 262 return (0); 263 } 264 265 /* 266 * Fdesc flat namespace lookup. 267 * Currently unsupported. 268 */ 269 int 270 fdesc_vget(mp, ino, vpp) 271 struct mount *mp; 272 ino_t ino; 273 struct vnode **vpp; 274 { 275 276 return (EOPNOTSUPP); 277 } 278 279 280 /*ARGSUSED*/ 281 int 282 fdesc_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 283 struct mount *mp; 284 struct fid *fhp; 285 struct mbuf *nam; 286 struct vnode **vpp; 287 int *exflagsp; 288 struct ucred **credanonp; 289 { 290 291 return (EOPNOTSUPP); 292 } 293 294 /*ARGSUSED*/ 295 int 296 fdesc_vptofh(vp, fhp) 297 struct vnode *vp; 298 struct fid *fhp; 299 { 300 return (EOPNOTSUPP); 301 } 302 303 struct vfsops fdesc_vfsops = { 304 MOUNT_FDESC, 305 fdesc_mount, 306 fdesc_start, 307 fdesc_unmount, 308 fdesc_root, 309 fdesc_quotactl, 310 fdesc_statfs, 311 fdesc_sync, 312 fdesc_vget, 313 fdesc_fhtovp, 314 fdesc_vptofh, 315 fdesc_init, 316 }; 317
Indexes created Fri Sep 26 08:10:20 GMT 2025