fdesc_vfsops.c revision 1.35
1 /* $NetBSD: fdesc_vfsops.c,v 1.35 2001/11/10 13:33:41 lukem 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 1.35 2001/11/10 13:33:41 lukem 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/types.h> 58 #include <sys/proc.h> 59 #include <sys/resourcevar.h> 60 #include <sys/filedesc.h> 61 #include <sys/vnode.h> 62 #include <sys/mount.h> 63 #include <sys/namei.h> 64 #include <sys/malloc.h> 65 #include <miscfs/fdesc/fdesc.h> 66 67 int fdesc_mount __P((struct mount *, const char *, void *, 68 struct nameidata *, struct proc *)); 69 int fdesc_start __P((struct mount *, int, struct proc *)); 70 int fdesc_unmount __P((struct mount *, int, struct proc *)); 71 int fdesc_quotactl __P((struct mount *, int, uid_t, caddr_t, 72 struct proc *)); 73 int fdesc_statfs __P((struct mount *, struct statfs *, struct proc *)); 74 int fdesc_sync __P((struct mount *, int, struct ucred *, struct proc *)); 75 int fdesc_vget __P((struct mount *, ino_t, struct vnode **)); 76 int fdesc_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 77 int fdesc_checkexp __P((struct mount *, struct mbuf *, int *, 78 struct ucred **)); 79 int fdesc_vptofh __P((struct vnode *, struct fid *)); 80 int fdesc_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 81 struct proc *)); 82 83 /* 84 * Mount the per-process file descriptors (/dev/fd) 85 */ 86 int 87 fdesc_mount(mp, path, data, ndp, p) 88 struct mount *mp; 89 const char *path; 90 void *data; 91 struct nameidata *ndp; 92 struct proc *p; 93 { 94 int error = 0; 95 size_t size; 96 struct fdescmount *fmp; 97 struct vnode *rvp; 98 99 /* 100 * Update is a no-op 101 */ 102 if (mp->mnt_flag & MNT_UPDATE) 103 return (EOPNOTSUPP); 104 105 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp); 106 if (error) 107 return (error); 108 109 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), 110 M_UFSMNT, M_WAITOK); /* XXX */ 111 rvp->v_type = VDIR; 112 rvp->v_flag |= VROOT; 113 fmp->f_root = rvp; 114 mp->mnt_flag |= MNT_LOCAL; 115 mp->mnt_data = (qaddr_t)fmp; 116 vfs_getnewfsid(mp); 117 118 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 119 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 120 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 121 memcpy(mp->mnt_stat.f_mntfromname, "fdesc", sizeof("fdesc")); 122 VOP_UNLOCK(rvp, 0); 123 return (0); 124 } 125 126 int 127 fdesc_start(mp, flags, p) 128 struct mount *mp; 129 int flags; 130 struct proc *p; 131 { 132 return (0); 133 } 134 135 int 136 fdesc_unmount(mp, mntflags, p) 137 struct mount *mp; 138 int mntflags; 139 struct proc *p; 140 { 141 int error; 142 int flags = 0; 143 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 144 145 if (mntflags & MNT_FORCE) 146 flags |= FORCECLOSE; 147 148 /* 149 * Clear out buffer cache. I don't think we 150 * ever get anything cached at this level at the 151 * moment, but who knows... 152 */ 153 if (rootvp->v_usecount > 1) 154 return (EBUSY); 155 if ((error = vflush(mp, rootvp, flags)) != 0) 156 return (error); 157 158 /* 159 * Release reference on underlying root vnode 160 */ 161 vrele(rootvp); 162 /* 163 * And blow it away for future re-use 164 */ 165 vgone(rootvp); 166 /* 167 * Finally, throw away the fdescmount structure 168 */ 169 free(mp->mnt_data, M_UFSMNT); /* XXX */ 170 mp->mnt_data = 0; 171 172 return (0); 173 } 174 175 int 176 fdesc_root(mp, vpp) 177 struct mount *mp; 178 struct vnode **vpp; 179 { 180 struct vnode *vp; 181 182 /* 183 * Return locked reference to root. 184 */ 185 vp = VFSTOFDESC(mp)->f_root; 186 VREF(vp); 187 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 188 *vpp = vp; 189 return (0); 190 } 191 192 int 193 fdesc_quotactl(mp, cmd, uid, arg, p) 194 struct mount *mp; 195 int cmd; 196 uid_t uid; 197 caddr_t arg; 198 struct proc *p; 199 { 200 201 return (EOPNOTSUPP); 202 } 203 204 int 205 fdesc_statfs(mp, sbp, p) 206 struct mount *mp; 207 struct statfs *sbp; 208 struct proc *p; 209 { 210 struct filedesc *fdp; 211 int lim; 212 int i; 213 int last; 214 int freefd; 215 216 /* 217 * Compute number of free file descriptors. 218 * [ Strange results will ensue if the open file 219 * limit is ever reduced below the current number 220 * of open files... ] 221 */ 222 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 223 fdp = p->p_fd; 224 last = min(fdp->fd_nfiles, lim); 225 freefd = 0; 226 for (i = fdp->fd_freefile; i < last; i++) 227 if (fdp->fd_ofiles[i] == NULL) 228 freefd++; 229 230 /* 231 * Adjust for the fact that the fdesc array may not 232 * have been fully allocated yet. 233 */ 234 if (fdp->fd_nfiles < lim) 235 freefd += (lim - fdp->fd_nfiles); 236 237 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 #ifdef COMPAT_09 245 sbp->f_type = 6; 246 #else 247 sbp->f_type = 0; 248 #endif 249 if (sbp != &mp->mnt_stat) { 250 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 251 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 252 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 253 } 254 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 255 return (0); 256 } 257 258 /*ARGSUSED*/ 259 int 260 fdesc_sync(mp, waitfor, uc, p) 261 struct mount *mp; 262 int waitfor; 263 struct ucred *uc; 264 struct proc *p; 265 { 266 267 return (0); 268 } 269 270 /* 271 * Fdesc flat namespace lookup. 272 * Currently unsupported. 273 */ 274 int 275 fdesc_vget(mp, ino, vpp) 276 struct mount *mp; 277 ino_t ino; 278 struct vnode **vpp; 279 { 280 281 return (EOPNOTSUPP); 282 } 283 284 285 /*ARGSUSED*/ 286 int 287 fdesc_fhtovp(mp, fhp, vpp) 288 struct mount *mp; 289 struct fid *fhp; 290 struct vnode **vpp; 291 { 292 293 return (EOPNOTSUPP); 294 } 295 296 /*ARGSUSED*/ 297 int 298 fdesc_checkexp(mp, nam, exflagsp, credanonp) 299 struct mount *mp; 300 struct mbuf *nam; 301 int *exflagsp; 302 struct ucred **credanonp; 303 { 304 305 return (EOPNOTSUPP); 306 } 307 308 /*ARGSUSED*/ 309 int 310 fdesc_vptofh(vp, fhp) 311 struct vnode *vp; 312 struct fid *fhp; 313 { 314 return (EOPNOTSUPP); 315 } 316 317 int 318 fdesc_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 319 int *name; 320 u_int namelen; 321 void *oldp; 322 size_t *oldlenp; 323 void *newp; 324 size_t newlen; 325 struct proc *p; 326 { 327 return (EOPNOTSUPP); 328 } 329 330 extern const struct vnodeopv_desc fdesc_vnodeop_opv_desc; 331 332 const struct vnodeopv_desc * const fdesc_vnodeopv_descs[] = { 333 &fdesc_vnodeop_opv_desc, 334 NULL, 335 }; 336 337 struct vfsops fdesc_vfsops = { 338 MOUNT_FDESC, 339 fdesc_mount, 340 fdesc_start, 341 fdesc_unmount, 342 fdesc_root, 343 fdesc_quotactl, 344 fdesc_statfs, 345 fdesc_sync, 346 fdesc_vget, 347 fdesc_fhtovp, 348 fdesc_vptofh, 349 fdesc_init, 350 NULL, 351 fdesc_done, 352 fdesc_sysctl, 353 NULL, /* vfs_mountroot */ 354 fdesc_checkexp, 355 fdesc_vnodeopv_descs, 356 }; 357
Indexes created Fri Sep 26 20:09:58 GMT 2025