fdesc_vfsops.c revision 1.32
1 /* $NetBSD: fdesc_vfsops.c,v 1.32 2001/01/22 12:17:37 jdolecek 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 #if defined(_KERNEL) && !defined(_LKM) 48 #include "opt_compat_netbsd.h" 49 #endif 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/time.h> 54 #include <sys/types.h> 55 #include <sys/proc.h> 56 #include <sys/resourcevar.h> 57 #include <sys/filedesc.h> 58 #include <sys/vnode.h> 59 #include <sys/mount.h> 60 #include <sys/namei.h> 61 #include <sys/malloc.h> 62 #include <miscfs/fdesc/fdesc.h> 63 64 int fdesc_mount __P((struct mount *, const char *, void *, 65 struct nameidata *, struct proc *)); 66 int fdesc_start __P((struct mount *, int, struct proc *)); 67 int fdesc_unmount __P((struct mount *, int, struct proc *)); 68 int fdesc_quotactl __P((struct mount *, int, uid_t, caddr_t, 69 struct proc *)); 70 int fdesc_statfs __P((struct mount *, struct statfs *, struct proc *)); 71 int fdesc_sync __P((struct mount *, int, struct ucred *, struct proc *)); 72 int fdesc_vget __P((struct mount *, ino_t, struct vnode **)); 73 int fdesc_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 74 int fdesc_checkexp __P((struct mount *, struct mbuf *, int *, 75 struct ucred **)); 76 int fdesc_vptofh __P((struct vnode *, struct fid *)); 77 int fdesc_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 78 struct proc *)); 79 80 /* 81 * Mount the per-process file descriptors (/dev/fd) 82 */ 83 int 84 fdesc_mount(mp, path, data, ndp, p) 85 struct mount *mp; 86 const char *path; 87 void *data; 88 struct nameidata *ndp; 89 struct proc *p; 90 { 91 int error = 0; 92 size_t size; 93 struct fdescmount *fmp; 94 struct vnode *rvp; 95 96 /* 97 * Update is a no-op 98 */ 99 if (mp->mnt_flag & MNT_UPDATE) 100 return (EOPNOTSUPP); 101 102 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp); 103 if (error) 104 return (error); 105 106 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), 107 M_UFSMNT, M_WAITOK); /* XXX */ 108 rvp->v_type = VDIR; 109 rvp->v_flag |= VROOT; 110 fmp->f_root = rvp; 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 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 117 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 118 memcpy(mp->mnt_stat.f_mntfromname, "fdesc", sizeof("fdesc")); 119 VOP_UNLOCK(rvp, 0); 120 return (0); 121 } 122 123 int 124 fdesc_start(mp, flags, p) 125 struct mount *mp; 126 int flags; 127 struct proc *p; 128 { 129 return (0); 130 } 131 132 int 133 fdesc_unmount(mp, mntflags, p) 134 struct mount *mp; 135 int mntflags; 136 struct proc *p; 137 { 138 int error; 139 int flags = 0; 140 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 141 142 if (mntflags & MNT_FORCE) 143 flags |= FORCECLOSE; 144 145 /* 146 * Clear out buffer cache. I don't think we 147 * ever get anything cached at this level at the 148 * moment, but who knows... 149 */ 150 if (rootvp->v_usecount > 1) 151 return (EBUSY); 152 if ((error = vflush(mp, rootvp, flags)) != 0) 153 return (error); 154 155 /* 156 * Release reference on underlying root vnode 157 */ 158 vrele(rootvp); 159 /* 160 * And blow it away for future re-use 161 */ 162 vgone(rootvp); 163 /* 164 * Finally, throw away the fdescmount structure 165 */ 166 free(mp->mnt_data, M_UFSMNT); /* XXX */ 167 mp->mnt_data = 0; 168 169 return (0); 170 } 171 172 int 173 fdesc_root(mp, vpp) 174 struct mount *mp; 175 struct vnode **vpp; 176 { 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); 185 *vpp = vp; 186 return (0); 187 } 188 189 int 190 fdesc_quotactl(mp, cmd, uid, arg, p) 191 struct mount *mp; 192 int cmd; 193 uid_t uid; 194 caddr_t arg; 195 struct proc *p; 196 { 197 198 return (EOPNOTSUPP); 199 } 200 201 int 202 fdesc_statfs(mp, sbp, p) 203 struct mount *mp; 204 struct statfs *sbp; 205 struct proc *p; 206 { 207 struct filedesc *fdp; 208 int lim; 209 int i; 210 int last; 211 int freefd; 212 213 /* 214 * Compute number of free file descriptors. 215 * [ Strange results will ensue if the open file 216 * limit is ever reduced below the current number 217 * of open files... ] 218 */ 219 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 220 fdp = p->p_fd; 221 last = min(fdp->fd_nfiles, lim); 222 freefd = 0; 223 for (i = fdp->fd_freefile; i < last; i++) 224 if (fdp->fd_ofiles[i] == NULL) 225 freefd++; 226 227 /* 228 * Adjust for the fact that the fdesc array may not 229 * have been fully allocated yet. 230 */ 231 if (fdp->fd_nfiles < lim) 232 freefd += (lim - fdp->fd_nfiles); 233 234 sbp->f_bsize = DEV_BSIZE; 235 sbp->f_iosize = DEV_BSIZE; 236 sbp->f_blocks = 2; /* 1K to keep df happy */ 237 sbp->f_bfree = 0; 238 sbp->f_bavail = 0; 239 sbp->f_files = lim + 1; /* Allow for "." */ 240 sbp->f_ffree = freefd; /* See comments above */ 241 #ifdef COMPAT_09 242 sbp->f_type = 6; 243 #else 244 sbp->f_type = 0; 245 #endif 246 if (sbp != &mp->mnt_stat) { 247 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 248 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 249 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 250 } 251 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 252 return (0); 253 } 254 255 /*ARGSUSED*/ 256 int 257 fdesc_sync(mp, waitfor, uc, p) 258 struct mount *mp; 259 int waitfor; 260 struct ucred *uc; 261 struct proc *p; 262 { 263 264 return (0); 265 } 266 267 /* 268 * Fdesc flat namespace lookup. 269 * Currently unsupported. 270 */ 271 int 272 fdesc_vget(mp, ino, vpp) 273 struct mount *mp; 274 ino_t ino; 275 struct vnode **vpp; 276 { 277 278 return (EOPNOTSUPP); 279 } 280 281 282 /*ARGSUSED*/ 283 int 284 fdesc_fhtovp(mp, fhp, vpp) 285 struct mount *mp; 286 struct fid *fhp; 287 struct vnode **vpp; 288 { 289 290 return (EOPNOTSUPP); 291 } 292 293 /*ARGSUSED*/ 294 int 295 fdesc_checkexp(mp, nam, exflagsp, credanonp) 296 struct mount *mp; 297 struct mbuf *nam; 298 int *exflagsp; 299 struct ucred **credanonp; 300 { 301 302 return (EOPNOTSUPP); 303 } 304 305 /*ARGSUSED*/ 306 int 307 fdesc_vptofh(vp, fhp) 308 struct vnode *vp; 309 struct fid *fhp; 310 { 311 return (EOPNOTSUPP); 312 } 313 314 int 315 fdesc_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 316 int *name; 317 u_int namelen; 318 void *oldp; 319 size_t *oldlenp; 320 void *newp; 321 size_t newlen; 322 struct proc *p; 323 { 324 return (EOPNOTSUPP); 325 } 326 327 extern const struct vnodeopv_desc fdesc_vnodeop_opv_desc; 328 329 const struct vnodeopv_desc * const fdesc_vnodeopv_descs[] = { 330 &fdesc_vnodeop_opv_desc, 331 NULL, 332 }; 333 334 struct vfsops fdesc_vfsops = { 335 MOUNT_FDESC, 336 fdesc_mount, 337 fdesc_start, 338 fdesc_unmount, 339 fdesc_root, 340 fdesc_quotactl, 341 fdesc_statfs, 342 fdesc_sync, 343 fdesc_vget, 344 fdesc_fhtovp, 345 fdesc_vptofh, 346 fdesc_init, 347 fdesc_done, 348 fdesc_sysctl, 349 NULL, /* vfs_mountroot */ 350 fdesc_checkexp, 351 fdesc_vnodeopv_descs, 352 }; 353
Indexes created Fri Sep 26 20:09:58 GMT 2025