1 /* $NetBSD: fdesc_vfsops.c,v 1.38 2002/09/21 18:09:27 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993, 1995 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 8.10 (Berkeley) 5/14/95 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/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: fdesc_vfsops.c,v 1.38 2002/09/21 18:09:27 christos Exp $"); 49 50 #if defined(_KERNEL_OPT) 51 #include "opt_compat_netbsd.h" 52 #endif 53 54 #include <sys/param.h> 55 #include <sys/systm.h> 56 #include <sys/time.h> 57 #include <sys/proc.h> 58 #include <sys/resourcevar.h> 59 #include <sys/filedesc.h> 60 #include <sys/vnode.h> 61 #include <sys/mount.h> 62 #include <sys/namei.h> 63 #include <sys/malloc.h> 64 #include <miscfs/fdesc/fdesc.h> 65 66 int fdesc_mount __P((struct mount *, const char *, void *, 67 struct nameidata *, struct proc *)); 68 int fdesc_start __P((struct mount *, int, struct proc *)); 69 int fdesc_unmount __P((struct mount *, int, struct proc *)); 70 int fdesc_quotactl __P((struct mount *, int, uid_t, caddr_t, 71 struct proc *)); 72 int fdesc_statfs __P((struct mount *, struct statfs *, struct proc *)); 73 int fdesc_sync __P((struct mount *, int, struct ucred *, struct proc *)); 74 int fdesc_vget __P((struct mount *, ino_t, struct vnode **)); 75 int fdesc_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 76 int fdesc_checkexp __P((struct mount *, struct mbuf *, int *, 77 struct ucred **)); 78 int fdesc_vptofh __P((struct vnode *, struct fid *)); 79 int fdesc_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 80 struct proc *)); 81 82 /* 83 * Mount the per-process file descriptors (/dev/fd) 84 */ 85 int 86 fdesc_mount(mp, path, data, ndp, p) 87 struct mount *mp; 88 const char *path; 89 void *data; 90 struct nameidata *ndp; 91 struct proc *p; 92 { 93 int error = 0; 94 size_t size; 95 struct fdescmount *fmp; 96 struct vnode *rvp; 97 98 if (mp->mnt_flag & MNT_GETARGS) 99 return 0; 100 /* 101 * Update is a no-op 102 */ 103 if (mp->mnt_flag & MNT_UPDATE) 104 return (EOPNOTSUPP); 105 106 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp); 107 if (error) 108 return (error); 109 110 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), 111 M_UFSMNT, M_WAITOK); /* XXX */ 112 rvp->v_type = VDIR; 113 rvp->v_flag |= VROOT; 114 fmp->f_root = rvp; 115 mp->mnt_flag |= MNT_LOCAL; 116 mp->mnt_data = fmp; 117 vfs_getnewfsid(mp); 118 119 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 120 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 121 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 122 memcpy(mp->mnt_stat.f_mntfromname, "fdesc", sizeof("fdesc")); 123 VOP_UNLOCK(rvp, 0); 124 return (0); 125 } 126 127 int 128 fdesc_start(mp, flags, p) 129 struct mount *mp; 130 int flags; 131 struct proc *p; 132 { 133 return (0); 134 } 135 136 int 137 fdesc_unmount(mp, mntflags, p) 138 struct mount *mp; 139 int mntflags; 140 struct proc *p; 141 { 142 int error; 143 int flags = 0; 144 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 145 146 if (mntflags & MNT_FORCE) 147 flags |= FORCECLOSE; 148 149 /* 150 * Clear out buffer cache. I don't think we 151 * ever get anything cached at this level at the 152 * moment, but who knows... 153 */ 154 if (rootvp->v_usecount > 1) 155 return (EBUSY); 156 if ((error = vflush(mp, rootvp, flags)) != 0) 157 return (error); 158 159 /* 160 * Release reference on underlying root vnode 161 */ 162 vrele(rootvp); 163 /* 164 * And blow it away for future re-use 165 */ 166 vgone(rootvp); 167 /* 168 * Finally, throw away the fdescmount structure 169 */ 170 free(mp->mnt_data, M_UFSMNT); /* XXX */ 171 mp->mnt_data = 0; 172 173 return (0); 174 } 175 176 int 177 fdesc_root(mp, vpp) 178 struct mount *mp; 179 struct vnode **vpp; 180 { 181 struct vnode *vp; 182 183 /* 184 * Return locked reference to root. 185 */ 186 vp = VFSTOFDESC(mp)->f_root; 187 VREF(vp); 188 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 189 *vpp = vp; 190 return (0); 191 } 192 193 int 194 fdesc_quotactl(mp, cmd, uid, arg, p) 195 struct mount *mp; 196 int cmd; 197 uid_t uid; 198 caddr_t arg; 199 struct proc *p; 200 { 201 202 return (EOPNOTSUPP); 203 } 204 205 int 206 fdesc_statfs(mp, sbp, p) 207 struct mount *mp; 208 struct statfs *sbp; 209 struct proc *p; 210 { 211 struct filedesc *fdp; 212 int lim; 213 int i; 214 int last; 215 int freefd; 216 217 /* 218 * Compute number of free file descriptors. 219 * [ Strange results will ensue if the open file 220 * limit is ever reduced below the current number 221 * of open files... ] 222 */ 223 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 224 fdp = p->p_fd; 225 last = min(fdp->fd_nfiles, lim); 226 freefd = 0; 227 for (i = fdp->fd_freefile; i < last; i++) 228 if (fdp->fd_ofiles[i] == NULL) 229 freefd++; 230 231 /* 232 * Adjust for the fact that the fdesc array may not 233 * have been fully allocated yet. 234 */ 235 if (fdp->fd_nfiles < lim) 236 freefd += (lim - fdp->fd_nfiles); 237 238 sbp->f_bsize = DEV_BSIZE; 239 sbp->f_iosize = DEV_BSIZE; 240 sbp->f_blocks = 2; /* 1K to keep df happy */ 241 sbp->f_bfree = 0; 242 sbp->f_bavail = 0; 243 sbp->f_files = lim + 1; /* Allow for "." */ 244 sbp->f_ffree = freefd; /* See comments above */ 245 #ifdef COMPAT_09 246 sbp->f_type = 6; 247 #else 248 sbp->f_type = 0; 249 #endif 250 if (sbp != &mp->mnt_stat) { 251 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 252 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 253 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 254 } 255 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 256 return (0); 257 } 258 259 /*ARGSUSED*/ 260 int 261 fdesc_sync(mp, waitfor, uc, p) 262 struct mount *mp; 263 int waitfor; 264 struct ucred *uc; 265 struct proc *p; 266 { 267 268 return (0); 269 } 270 271 /* 272 * Fdesc flat namespace lookup. 273 * Currently unsupported. 274 */ 275 int 276 fdesc_vget(mp, ino, vpp) 277 struct mount *mp; 278 ino_t ino; 279 struct vnode **vpp; 280 { 281 282 return (EOPNOTSUPP); 283 } 284 285 286 /*ARGSUSED*/ 287 int 288 fdesc_fhtovp(mp, fhp, vpp) 289 struct mount *mp; 290 struct fid *fhp; 291 struct vnode **vpp; 292 { 293 294 return (EOPNOTSUPP); 295 } 296 297 /*ARGSUSED*/ 298 int 299 fdesc_checkexp(mp, nam, exflagsp, credanonp) 300 struct mount *mp; 301 struct mbuf *nam; 302 int *exflagsp; 303 struct ucred **credanonp; 304 { 305 306 return (EOPNOTSUPP); 307 } 308 309 /*ARGSUSED*/ 310 int 311 fdesc_vptofh(vp, fhp) 312 struct vnode *vp; 313 struct fid *fhp; 314 { 315 return (EOPNOTSUPP); 316 } 317 318 int 319 fdesc_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 320 int *name; 321 u_int namelen; 322 void *oldp; 323 size_t *oldlenp; 324 void *newp; 325 size_t newlen; 326 struct proc *p; 327 { 328 return (EOPNOTSUPP); 329 } 330 331 extern const struct vnodeopv_desc fdesc_vnodeop_opv_desc; 332 333 const struct vnodeopv_desc * const fdesc_vnodeopv_descs[] = { 334 &fdesc_vnodeop_opv_desc, 335 NULL, 336 }; 337 338 struct vfsops fdesc_vfsops = { 339 MOUNT_FDESC, 340 fdesc_mount, 341 fdesc_start, 342 fdesc_unmount, 343 fdesc_root, 344 fdesc_quotactl, 345 fdesc_statfs, 346 fdesc_sync, 347 fdesc_vget, 348 fdesc_fhtovp, 349 fdesc_vptofh, 350 fdesc_init, 351 NULL, 352 fdesc_done, 353 fdesc_sysctl, 354 NULL, /* vfs_mountroot */ 355 fdesc_checkexp, 356 fdesc_vnodeopv_descs, 357 }; 358