1/* 2 * Copyright (c) 1992, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software donated to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94 37 *
|
38 * $Id: fdesc_vfsops.c,v 1.10 1997/02/22 09:40:15 peter Exp $
|
38 * $Id: fdesc_vfsops.c,v 1.11 1997/08/02 14:31:59 bde Exp $ |
39 */ 40 41/* 42 * /dev/fd Filesystem 43 */ 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/kernel.h> 48#include <sys/proc.h> 49#include <sys/resourcevar.h> 50#include <sys/filedesc.h> 51#include <sys/vnode.h> 52#include <sys/mount.h> 53#include <sys/malloc.h> 54#include <miscfs/fdesc/fdesc.h> 55 56static int fdesc_fhtovp __P((struct mount *mp, struct fid *fhp, 57 struct mbuf *nam, struct vnode **vpp, 58 int *exflagsp, struct ucred **credanonp)); 59static int fdesc_mount __P((struct mount *mp, char *path, caddr_t data, 60 struct nameidata *ndp, struct proc *p)); 61static int fdesc_quotactl __P((struct mount *mp, int cmd, uid_t uid, 62 caddr_t arg, struct proc *p)); 63static int fdesc_start __P((struct mount *mp, int flags, struct proc *p)); 64static int fdesc_unmount __P((struct mount *mp, int mntflags, 65 struct proc *p)); 66static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp, 67 struct proc *p)); 68static int fdesc_sync __P((struct mount *mp, int waitfor, 69 struct ucred *cred, struct proc *p)); 70static int fdesc_vget __P((struct mount *mp, ino_t ino, 71 struct vnode **vpp)); 72static int fdesc_vptofh __P((struct vnode *vp, struct fid *fhp)); 73 74/* 75 * Mount the per-process file descriptors (/dev/fd) 76 */ 77static int 78fdesc_mount(mp, path, data, ndp, p) 79 struct mount *mp; 80 char *path; 81 caddr_t data; 82 struct nameidata *ndp; 83 struct proc *p; 84{ 85 int error = 0; 86 u_int size; 87 struct fdescmount *fmp; 88 struct vnode *rvp; 89 90 /* 91 * Update is a no-op 92 */ 93 if (mp->mnt_flag & MNT_UPDATE) 94 return (EOPNOTSUPP); 95 96 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp); 97 if (error) 98 return (error); 99 100 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), 101 M_UFSMNT, M_WAITOK); /* XXX */ 102 rvp->v_type = VDIR; 103 rvp->v_flag |= VROOT; 104 fmp->f_root = rvp; 105 /* XXX -- don't mark as local to work around fts() problems */ 106 /*mp->mnt_flag |= MNT_LOCAL;*/ 107 mp->mnt_data = (qaddr_t) fmp; 108 vfs_getnewfsid(mp); 109 110 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 111 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 112 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 113 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc")); 114 (void)fdesc_statfs(mp, &mp->mnt_stat, p); 115 return (0); 116} 117 118static int 119fdesc_start(mp, flags, p) 120 struct mount *mp; 121 int flags; 122 struct proc *p; 123{ 124 return (0); 125} 126 127static int 128fdesc_unmount(mp, mntflags, p) 129 struct mount *mp; 130 int mntflags; 131 struct proc *p; 132{ 133 int error; 134 int flags = 0; 135 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 136 137 if (mntflags & MNT_FORCE) 138 flags |= FORCECLOSE; 139 140 /* 141 * Clear out buffer cache. I don't think we 142 * ever get anything cached at this level at the 143 * moment, but who knows... 144 */ 145 if (rootvp->v_usecount > 1) 146 return (EBUSY); 147 if (error = vflush(mp, rootvp, flags)) 148 return (error); 149 150 /* 151 * Release reference on underlying root vnode 152 */ 153 vrele(rootvp); 154 /* 155 * And blow it away for future re-use 156 */ 157 vgone(rootvp); 158 /* 159 * Finally, throw away the fdescmount structure 160 */ 161 free(mp->mnt_data, M_UFSMNT); /* XXX */ 162 mp->mnt_data = 0; 163 164 return (0); 165} 166 167int 168fdesc_root(mp, vpp) 169 struct mount *mp; 170 struct vnode **vpp; 171{ 172 struct proc *p = curproc; /* XXX */ 173 struct vnode *vp; 174 175 /* 176 * Return locked reference to root. 177 */ 178 vp = VFSTOFDESC(mp)->f_root; 179 VREF(vp); 180 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 181 *vpp = vp; 182 return (0); 183} 184 185static int 186fdesc_statfs(mp, sbp, p) 187 struct mount *mp; 188 struct statfs *sbp; 189 struct proc *p; 190{ 191 struct filedesc *fdp; 192 int lim; 193 int i; 194 int last; 195 int freefd; 196 197 /* 198 * Compute number of free file descriptors. 199 * [ Strange results will ensue if the open file 200 * limit is ever reduced below the current number 201 * of open files... ] 202 */ 203 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 204 fdp = p->p_fd; 205 last = min(fdp->fd_nfiles, lim); 206 freefd = 0; 207 for (i = fdp->fd_freefile; i < last; i++) 208 if (fdp->fd_ofiles[i] == NULL) 209 freefd++; 210 211 /* 212 * Adjust for the fact that the fdesc array may not 213 * have been fully allocated yet. 214 */ 215 if (fdp->fd_nfiles < lim) 216 freefd += (lim - fdp->fd_nfiles); 217 218 sbp->f_flags = 0; 219 sbp->f_bsize = DEV_BSIZE; 220 sbp->f_iosize = DEV_BSIZE; 221 sbp->f_blocks = 2; /* 1K to keep df happy */ 222 sbp->f_bfree = 0; 223 sbp->f_bavail = 0; 224 sbp->f_files = lim + 1; /* Allow for "." */ 225 sbp->f_ffree = freefd; /* See comments above */ 226 if (sbp != &mp->mnt_stat) { 227 sbp->f_type = mp->mnt_vfc->vfc_typenum; 228 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 229 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 230 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 231 } 232 return (0); 233} 234 235static int 236fdesc_sync(mp, waitfor, cred, p) 237 struct mount *mp; 238 int waitfor; 239 struct ucred *cred; 240 struct proc *p; 241{ 242 243 return (0); 244} 245 246#define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
|
247 struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp)
|
247 struct sockaddr *, struct vnode **, int *, struct ucred **)))eopnotsupp) |
248#define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \ 249 struct proc *)))eopnotsupp) 250#define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \ 251 size_t, struct proc *)))eopnotsupp) 252#define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \ 253 eopnotsupp) 254#define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp) 255 256static struct vfsops fdesc_vfsops = { 257 fdesc_mount, 258 fdesc_start, 259 fdesc_unmount, 260 fdesc_root, 261 fdesc_quotactl, 262 fdesc_statfs, 263 fdesc_sync, 264 fdesc_vget, 265 fdesc_fhtovp, 266 fdesc_vptofh, 267 fdesc_init, 268}; 269 270VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, VFCF_SYNTHETIC);
|