fdesc_vfsops.c revision 1.1.1.2
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 8.10 (Berkeley) 5/14/95 37 * 38 * $Id: fdesc_vfsops.c,v 1.1.1.2 1998/03/01 02:13:12 fvdl Exp $ 39 */ 40 41 /* 42 * /dev/fd Filesystem 43 */ 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/time.h> 48 #include <sys/types.h> 49 #include <sys/proc.h> 50 #include <sys/resourcevar.h> 51 #include <sys/filedesc.h> 52 #include <sys/vnode.h> 53 #include <sys/mount.h> 54 #include <sys/namei.h> 55 #include <sys/malloc.h> 56 #include <miscfs/fdesc/fdesc.h> 57 58 /* 59 * Mount the per-process file descriptors (/dev/fd) 60 */ 61 int 62 fdesc_mount(mp, path, data, ndp, p) 63 struct mount *mp; 64 char *path; 65 caddr_t data; 66 struct nameidata *ndp; 67 struct proc *p; 68 { 69 int error = 0; 70 u_int size; 71 struct fdescmount *fmp; 72 struct vnode *rvp; 73 74 /* 75 * Update is a no-op 76 */ 77 if (mp->mnt_flag & MNT_UPDATE) 78 return (EOPNOTSUPP); 79 80 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp); 81 if (error) 82 return (error); 83 84 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount), 85 M_UFSMNT, M_WAITOK); /* XXX */ 86 rvp->v_type = VDIR; 87 rvp->v_flag |= VROOT; 88 fmp->f_root = rvp; 89 /* XXX -- don't mark as local to work around fts() problems */ 90 /*mp->mnt_flag |= MNT_LOCAL;*/ 91 mp->mnt_data = (qaddr_t) fmp; 92 vfs_getnewfsid(mp); 93 94 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 95 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 96 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 97 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc")); 98 return (0); 99 } 100 101 int 102 fdesc_start(mp, flags, p) 103 struct mount *mp; 104 int flags; 105 struct proc *p; 106 { 107 return (0); 108 } 109 110 int 111 fdesc_unmount(mp, mntflags, p) 112 struct mount *mp; 113 int mntflags; 114 struct proc *p; 115 { 116 int error; 117 int flags = 0; 118 struct vnode *rootvp = VFSTOFDESC(mp)->f_root; 119 120 if (mntflags & MNT_FORCE) 121 flags |= FORCECLOSE; 122 123 /* 124 * Clear out buffer cache. I don't think we 125 * ever get anything cached at this level at the 126 * moment, but who knows... 127 */ 128 if (rootvp->v_usecount > 1) 129 return (EBUSY); 130 if (error = vflush(mp, rootvp, flags)) 131 return (error); 132 133 /* 134 * Release reference on underlying root vnode 135 */ 136 vrele(rootvp); 137 /* 138 * And blow it away for future re-use 139 */ 140 vgone(rootvp); 141 /* 142 * Finally, throw away the fdescmount structure 143 */ 144 free(mp->mnt_data, M_UFSMNT); /* XXX */ 145 mp->mnt_data = 0; 146 147 return (0); 148 } 149 150 int 151 fdesc_root(mp, vpp) 152 struct mount *mp; 153 struct vnode **vpp; 154 { 155 struct proc *p = curproc; /* XXX */ 156 struct vnode *vp; 157 158 /* 159 * Return locked reference to root. 160 */ 161 vp = VFSTOFDESC(mp)->f_root; 162 VREF(vp); 163 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 164 *vpp = vp; 165 return (0); 166 } 167 168 int 169 fdesc_statfs(mp, sbp, p) 170 struct mount *mp; 171 struct statfs *sbp; 172 struct proc *p; 173 { 174 struct filedesc *fdp; 175 int lim; 176 int i; 177 int last; 178 int freefd; 179 180 /* 181 * Compute number of free file descriptors. 182 * [ Strange results will ensue if the open file 183 * limit is ever reduced below the current number 184 * of open files... ] 185 */ 186 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur; 187 fdp = p->p_fd; 188 last = min(fdp->fd_nfiles, lim); 189 freefd = 0; 190 for (i = fdp->fd_freefile; i < last; i++) 191 if (fdp->fd_ofiles[i] == NULL) 192 freefd++; 193 194 /* 195 * Adjust for the fact that the fdesc array may not 196 * have been fully allocated yet. 197 */ 198 if (fdp->fd_nfiles < lim) 199 freefd += (lim - fdp->fd_nfiles); 200 201 sbp->f_flags = 0; 202 sbp->f_bsize = DEV_BSIZE; 203 sbp->f_iosize = DEV_BSIZE; 204 sbp->f_blocks = 2; /* 1K to keep df happy */ 205 sbp->f_bfree = 0; 206 sbp->f_bavail = 0; 207 sbp->f_files = lim + 1; /* Allow for "." */ 208 sbp->f_ffree = freefd; /* See comments above */ 209 if (sbp != &mp->mnt_stat) { 210 sbp->f_type = mp->mnt_vfc->vfc_typenum; 211 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 212 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 213 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 214 } 215 return (0); 216 } 217 218 int 219 fdesc_sync(mp, waitfor) 220 struct mount *mp; 221 int waitfor; 222 { 223 224 return (0); 225 } 226 227 #define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \ 228 struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp) 229 #define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \ 230 struct proc *)))eopnotsupp) 231 #define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \ 232 size_t, struct proc *)))eopnotsupp) 233 #define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \ 234 eopnotsupp) 235 #define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp) 236 237 struct vfsops fdesc_vfsops = { 238 fdesc_mount, 239 fdesc_start, 240 fdesc_unmount, 241 fdesc_root, 242 fdesc_quotactl, 243 fdesc_statfs, 244 fdesc_sync, 245 fdesc_vget, 246 fdesc_fhtovp, 247 fdesc_vptofh, 248 fdesc_init, 249 fdesc_sysctl, 250 }; 251
Indexes created Tue Oct 14 11:09:46 GMT 2025