fdesc_vfsops.c revision 1.26
1 /* $NetBSD: fdesc_vfsops.c,v 1.26 1998/08/09 20:51:08 perry 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 mbuf *, 75 struct vnode **, int *, 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, MOUNT_FDESC); 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 return (0); 120 } 121 122 int 123 fdesc_start(mp, flags, p) 124 struct mount *mp; 125 int flags; 126 struct proc *p; 127 { 128 return (0); 129 } 130 131 int 132 fdesc_unmount(mp, mntflags, p) 133 struct mount *mp; 134 int mntflags; 135 struct proc *p; 136 { 137 int error; 138 int flags = 0; 139 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 140 141 if (mntflags & MNT_FORCE) 142 flags |= FORCECLOSE; 143 144 /* 145 * Clear out buffer cache. I don't think we 146 * ever get anything cached at this level at the 147 * moment, but who knows... 148 */ 149 if (rootvp->v_usecount > 1) 150 return (EBUSY); 151 if ((error = vflush(mp, rootvp, flags)) != 0) 152 return (error); 153 154 /* 155 * Release reference on underlying root vnode 156 */ 157 vrele(rootvp); 158 /* 159 * And blow it away for future re-use 160 */ 161 vgone(rootvp); 162 /* 163 * Finally, throw away the fdescmount structure 164 */ 165 free(mp->mnt_data, M_UFSMNT); /* XXX */ 166 mp->mnt_data = 0; 167 168 return (0); 169 } 170 171 int 172 fdesc_root(mp, vpp) 173 struct mount *mp; 174 struct vnode **vpp; 175 { 176 struct vnode *vp; 177 178 /* 179 * Return locked reference to root. 180 */ 181 vp = VFSTOFDESC(mp)->f_root; 182 VREF(vp); 183 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 184 *vpp = vp; 185 return (0); 186 } 187 188 int 189 fdesc_quotactl(mp, cmd, uid, arg, p) 190 struct mount *mp; 191 int cmd; 192 uid_t uid; 193 caddr_t arg; 194 struct proc *p; 195 { 196 197 return (EOPNOTSUPP); 198 } 199 200 int 201 fdesc_statfs(mp, sbp, p) 202 struct mount *mp; 203 struct statfs *sbp; 204 struct proc *p; 205 { 206 struct filedesc *fdp; 207 int lim; 208 int i; 209 int last; 210 int freefd; 211 212 /* 213 * Compute number of free file descriptors. 214 * [ Strange results will ensue if the open file 215 * limit is ever reduced below the current number 216 * of open files... ] 217 */ 218 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 219 fdp = p->p_fd; 220 last = min(fdp->fd_nfiles, lim); 221 freefd = 0; 222 for (i = fdp->fd_freefile; i < last; i++) 223 if (fdp->fd_ofiles[i] == NULL) 224 freefd++; 225 226 /* 227 * Adjust for the fact that the fdesc array may not 228 * have been fully allocated yet. 229 */ 230 if (fdp->fd_nfiles < lim) 231 freefd += (lim - fdp->fd_nfiles); 232 233 sbp->f_bsize = DEV_BSIZE; 234 sbp->f_iosize = DEV_BSIZE; 235 sbp->f_blocks = 2; /* 1K to keep df happy */ 236 sbp->f_bfree = 0; 237 sbp->f_bavail = 0; 238 sbp->f_files = lim + 1; /* Allow for "." */ 239 sbp->f_ffree = freefd; /* See comments above */ 240 #ifdef COMPAT_09 241 sbp->f_type = 6; 242 #else 243 sbp->f_type = 0; 244 #endif 245 if (sbp != &mp->mnt_stat) { 246 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 247 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 248 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 249 } 250 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 251 return (0); 252 } 253 254 /*ARGSUSED*/ 255 int 256 fdesc_sync(mp, waitfor, uc, p) 257 struct mount *mp; 258 int waitfor; 259 struct ucred *uc; 260 struct proc *p; 261 { 262 263 return (0); 264 } 265 266 /* 267 * Fdesc flat namespace lookup. 268 * Currently unsupported. 269 */ 270 int 271 fdesc_vget(mp, ino, vpp) 272 struct mount *mp; 273 ino_t ino; 274 struct vnode **vpp; 275 { 276 277 return (EOPNOTSUPP); 278 } 279 280 281 /*ARGSUSED*/ 282 int 283 fdesc_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 284 struct mount *mp; 285 struct fid *fhp; 286 struct mbuf *nam; 287 struct vnode **vpp; 288 int *exflagsp; 289 struct ucred **credanonp; 290 { 291 292 return (EOPNOTSUPP); 293 } 294 295 /*ARGSUSED*/ 296 int 297 fdesc_vptofh(vp, fhp) 298 struct vnode *vp; 299 struct fid *fhp; 300 { 301 return (EOPNOTSUPP); 302 } 303 304 int 305 fdesc_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 306 int *name; 307 u_int namelen; 308 void *oldp; 309 size_t *oldlenp; 310 void *newp; 311 size_t newlen; 312 struct proc *p; 313 { 314 return (EOPNOTSUPP); 315 } 316 317 extern struct vnodeopv_desc fdesc_vnodeop_opv_desc; 318 319 struct vnodeopv_desc *fdesc_vnodeopv_descs[] = { 320 &fdesc_vnodeop_opv_desc, 321 NULL, 322 }; 323 324 struct vfsops fdesc_vfsops = { 325 MOUNT_FDESC, 326 fdesc_mount, 327 fdesc_start, 328 fdesc_unmount, 329 fdesc_root, 330 fdesc_quotactl, 331 fdesc_statfs, 332 fdesc_sync, 333 fdesc_vget, 334 fdesc_fhtovp, 335 fdesc_vptofh, 336 fdesc_init, 337 fdesc_sysctl, 338 NULL, /* vfs_mountroot */ 339 fdesc_vnodeopv_descs, 340 }; 341
Indexes created Thu Sep 25 16:09:42 GMT 2025