fdesc_vfsops.c revision 1.29
1 /* $NetBSD: fdesc_vfsops.c,v 1.29 2000/03/16 18:08:23 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_root __P((struct mount *, struct vnode **)); 69 int fdesc_quotactl __P((struct mount *, int, uid_t, caddr_t, 70 struct proc *)); 71 int fdesc_statfs __P((struct mount *, struct statfs *, struct proc *)); 72 int fdesc_sync __P((struct mount *, int, struct ucred *, struct proc *)); 73 int fdesc_vget __P((struct mount *, ino_t, struct vnode **)); 74 int fdesc_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 75 int fdesc_checkexp __P((struct mount *, struct mbuf *, int *, 76 struct ucred **)); 77 int fdesc_vptofh __P((struct vnode *, struct fid *)); 78 int fdesc_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 79 struct proc *)); 80 81 /* 82 * Mount the per-process file descriptors (/dev/fd) 83 */ 84 int 85 fdesc_mount(mp, path, data, ndp, p) 86 struct mount *mp; 87 const char *path; 88 void *data; 89 struct nameidata *ndp; 90 struct proc *p; 91 { 92 int error = 0; 93 size_t size; 94 struct fdescmount *fmp; 95 struct vnode *rvp; 96 97 /* 98 * Update is a no-op 99 */ 100 if (mp->mnt_flag & MNT_UPDATE) 101 return (EOPNOTSUPP); 102 103 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp); 104 if (error) 105 return (error); 106 107 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), 108 M_UFSMNT, M_WAITOK); /* XXX */ 109 rvp->v_type = VDIR; 110 rvp->v_flag |= VROOT; 111 fmp->f_root = rvp; 112 mp->mnt_flag |= MNT_LOCAL; 113 mp->mnt_data = (qaddr_t)fmp; 114 vfs_getnewfsid(mp, MOUNT_FDESC); 115 116 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 117 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 118 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 119 memcpy(mp->mnt_stat.f_mntfromname, "fdesc", sizeof("fdesc")); 120 VOP_UNLOCK(rvp, 0); 121 return (0); 122 } 123 124 int 125 fdesc_start(mp, flags, p) 126 struct mount *mp; 127 int flags; 128 struct proc *p; 129 { 130 return (0); 131 } 132 133 int 134 fdesc_unmount(mp, mntflags, p) 135 struct mount *mp; 136 int mntflags; 137 struct proc *p; 138 { 139 int error; 140 int flags = 0; 141 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 142 143 if (mntflags & MNT_FORCE) 144 flags |= FORCECLOSE; 145 146 /* 147 * Clear out buffer cache. I don't think we 148 * ever get anything cached at this level at the 149 * moment, but who knows... 150 */ 151 if (rootvp->v_usecount > 1) 152 return (EBUSY); 153 if ((error = vflush(mp, rootvp, flags)) != 0) 154 return (error); 155 156 /* 157 * Release reference on underlying root vnode 158 */ 159 vrele(rootvp); 160 /* 161 * And blow it away for future re-use 162 */ 163 vgone(rootvp); 164 /* 165 * Finally, throw away the fdescmount structure 166 */ 167 free(mp->mnt_data, M_UFSMNT); /* XXX */ 168 mp->mnt_data = 0; 169 170 return (0); 171 } 172 173 int 174 fdesc_root(mp, vpp) 175 struct mount *mp; 176 struct vnode **vpp; 177 { 178 struct vnode *vp; 179 180 /* 181 * Return locked reference to root. 182 */ 183 vp = VFSTOFDESC(mp)->f_root; 184 VREF(vp); 185 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 186 *vpp = vp; 187 return (0); 188 } 189 190 int 191 fdesc_quotactl(mp, cmd, uid, arg, p) 192 struct mount *mp; 193 int cmd; 194 uid_t uid; 195 caddr_t arg; 196 struct proc *p; 197 { 198 199 return (EOPNOTSUPP); 200 } 201 202 int 203 fdesc_statfs(mp, sbp, p) 204 struct mount *mp; 205 struct statfs *sbp; 206 struct proc *p; 207 { 208 struct filedesc *fdp; 209 int lim; 210 int i; 211 int last; 212 int freefd; 213 214 /* 215 * Compute number of free file descriptors. 216 * [ Strange results will ensue if the open file 217 * limit is ever reduced below the current number 218 * of open files... ] 219 */ 220 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 221 fdp = p->p_fd; 222 last = min(fdp->fd_nfiles, lim); 223 freefd = 0; 224 for (i = fdp->fd_freefile; i < last; i++) 225 if (fdp->fd_ofiles[i] == NULL) 226 freefd++; 227 228 /* 229 * Adjust for the fact that the fdesc array may not 230 * have been fully allocated yet. 231 */ 232 if (fdp->fd_nfiles < lim) 233 freefd += (lim - fdp->fd_nfiles); 234 235 sbp->f_bsize = DEV_BSIZE; 236 sbp->f_iosize = DEV_BSIZE; 237 sbp->f_blocks = 2; /* 1K to keep df happy */ 238 sbp->f_bfree = 0; 239 sbp->f_bavail = 0; 240 sbp->f_files = lim + 1; /* Allow for "." */ 241 sbp->f_ffree = freefd; /* See comments above */ 242 #ifdef COMPAT_09 243 sbp->f_type = 6; 244 #else 245 sbp->f_type = 0; 246 #endif 247 if (sbp != &mp->mnt_stat) { 248 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 249 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 250 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 251 } 252 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 253 return (0); 254 } 255 256 /*ARGSUSED*/ 257 int 258 fdesc_sync(mp, waitfor, uc, p) 259 struct mount *mp; 260 int waitfor; 261 struct ucred *uc; 262 struct proc *p; 263 { 264 265 return (0); 266 } 267 268 /* 269 * Fdesc flat namespace lookup. 270 * Currently unsupported. 271 */ 272 int 273 fdesc_vget(mp, ino, vpp) 274 struct mount *mp; 275 ino_t ino; 276 struct vnode **vpp; 277 { 278 279 return (EOPNOTSUPP); 280 } 281 282 283 /*ARGSUSED*/ 284 int 285 fdesc_fhtovp(mp, fhp, vpp) 286 struct mount *mp; 287 struct fid *fhp; 288 struct vnode **vpp; 289 { 290 291 return (EOPNOTSUPP); 292 } 293 294 /*ARGSUSED*/ 295 int 296 fdesc_checkexp(mp, nam, exflagsp, credanonp) 297 struct mount *mp; 298 struct mbuf *nam; 299 int *exflagsp; 300 struct ucred **credanonp; 301 { 302 303 return (EOPNOTSUPP); 304 } 305 306 /*ARGSUSED*/ 307 int 308 fdesc_vptofh(vp, fhp) 309 struct vnode *vp; 310 struct fid *fhp; 311 { 312 return (EOPNOTSUPP); 313 } 314 315 int 316 fdesc_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 317 int *name; 318 u_int namelen; 319 void *oldp; 320 size_t *oldlenp; 321 void *newp; 322 size_t newlen; 323 struct proc *p; 324 { 325 return (EOPNOTSUPP); 326 } 327 328 extern struct vnodeopv_desc fdesc_vnodeop_opv_desc; 329 330 struct vnodeopv_desc *fdesc_vnodeopv_descs[] = { 331 &fdesc_vnodeop_opv_desc, 332 NULL, 333 }; 334 335 struct vfsops fdesc_vfsops = { 336 MOUNT_FDESC, 337 fdesc_mount, 338 fdesc_start, 339 fdesc_unmount, 340 fdesc_root, 341 fdesc_quotactl, 342 fdesc_statfs, 343 fdesc_sync, 344 fdesc_vget, 345 fdesc_fhtovp, 346 fdesc_vptofh, 347 fdesc_init, 348 fdesc_done, 349 fdesc_sysctl, 350 NULL, /* vfs_mountroot */ 351 fdesc_checkexp, 352 fdesc_vnodeopv_descs, 353 }; 354
Indexes created Thu Sep 25 16:09:42 GMT 2025