1 /* $NetBSD: mfs_vnops.c,v 1.12 1996/10/12 21:58:54 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)mfs_vnops.c 8.5 (Berkeley) 7/28/94 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/time.h> 41 #include <sys/kernel.h> 42 #include <sys/proc.h> 43 #include <sys/buf.h> 44 #include <sys/map.h> 45 #include <sys/vnode.h> 46 #include <sys/malloc.h> 47 48 #include <miscfs/genfs/genfs.h> 49 #include <miscfs/specfs/specdev.h> 50 51 #include <machine/vmparam.h> 52 53 #include <ufs/mfs/mfsnode.h> 54 #include <ufs/mfs/mfsiom.h> 55 #include <ufs/mfs/mfs_extern.h> 56 57 /* 58 * mfs vnode operations. 59 */ 60 int (**mfs_vnodeop_p) __P((void *)); 61 struct vnodeopv_entry_desc mfs_vnodeop_entries[] = { 62 { &vop_default_desc, vn_default_error }, 63 { &vop_lookup_desc, mfs_lookup }, /* lookup */ 64 { &vop_create_desc, mfs_create }, /* create */ 65 { &vop_mknod_desc, mfs_mknod }, /* mknod */ 66 { &vop_open_desc, mfs_open }, /* open */ 67 { &vop_close_desc, mfs_close }, /* close */ 68 { &vop_access_desc, mfs_access }, /* access */ 69 { &vop_getattr_desc, mfs_getattr }, /* getattr */ 70 { &vop_setattr_desc, mfs_setattr }, /* setattr */ 71 { &vop_read_desc, mfs_read }, /* read */ 72 { &vop_write_desc, mfs_write }, /* write */ 73 { &vop_ioctl_desc, mfs_ioctl }, /* ioctl */ 74 { &vop_poll_desc, mfs_poll }, /* poll */ 75 { &vop_mmap_desc, mfs_mmap }, /* mmap */ 76 { &vop_fsync_desc, spec_fsync }, /* fsync */ 77 { &vop_seek_desc, mfs_seek }, /* seek */ 78 { &vop_remove_desc, mfs_remove }, /* remove */ 79 { &vop_link_desc, mfs_link }, /* link */ 80 { &vop_rename_desc, mfs_rename }, /* rename */ 81 { &vop_mkdir_desc, mfs_mkdir }, /* mkdir */ 82 { &vop_rmdir_desc, mfs_rmdir }, /* rmdir */ 83 { &vop_symlink_desc, mfs_symlink }, /* symlink */ 84 { &vop_readdir_desc, mfs_readdir }, /* readdir */ 85 { &vop_readlink_desc, mfs_readlink }, /* readlink */ 86 { &vop_abortop_desc, mfs_abortop }, /* abortop */ 87 { &vop_inactive_desc, mfs_inactive }, /* inactive */ 88 { &vop_reclaim_desc, mfs_reclaim }, /* reclaim */ 89 { &vop_lock_desc, mfs_lock }, /* lock */ 90 { &vop_unlock_desc, mfs_unlock }, /* unlock */ 91 { &vop_bmap_desc, mfs_bmap }, /* bmap */ 92 { &vop_strategy_desc, mfs_strategy }, /* strategy */ 93 { &vop_print_desc, mfs_print }, /* print */ 94 { &vop_islocked_desc, mfs_islocked }, /* islocked */ 95 { &vop_pathconf_desc, mfs_pathconf }, /* pathconf */ 96 { &vop_advlock_desc, mfs_advlock }, /* advlock */ 97 { &vop_blkatoff_desc, mfs_blkatoff }, /* blkatoff */ 98 { &vop_valloc_desc, mfs_valloc }, /* valloc */ 99 { &vop_vfree_desc, mfs_vfree }, /* vfree */ 100 { &vop_truncate_desc, mfs_truncate }, /* truncate */ 101 { &vop_update_desc, mfs_update }, /* update */ 102 { &vop_bwrite_desc, mfs_bwrite }, /* bwrite */ 103 { (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL } 104 }; 105 struct vnodeopv_desc mfs_vnodeop_opv_desc = 106 { &mfs_vnodeop_p, mfs_vnodeop_entries }; 107 108 /* 109 * Vnode Operations. 110 * 111 * Open called to allow memory filesystem to initialize and 112 * validate before actual IO. Record our process identifier 113 * so we can tell when we are doing I/O to ourself. 114 */ 115 /* ARGSUSED */ 116 int 117 mfs_open(v) 118 void *v; 119 { 120 struct vop_open_args /* { 121 struct vnode *a_vp; 122 int a_mode; 123 struct ucred *a_cred; 124 struct proc *a_p; 125 } */ *ap = v; 126 127 if (ap->a_vp->v_type != VBLK) { 128 panic("mfs_ioctl not VBLK"); 129 /* NOTREACHED */ 130 } 131 return (0); 132 } 133 134 /* 135 * Ioctl operation. 136 */ 137 /* ARGSUSED */ 138 int 139 mfs_ioctl(v) 140 void *v; 141 { 142 #if 0 143 struct vop_ioctl_args /* { 144 struct vnode *a_vp; 145 u_long a_command; 146 caddr_t a_data; 147 int a_fflag; 148 struct ucred *a_cred; 149 struct proc *a_p; 150 } */ *ap = v; 151 #endif 152 153 return (ENOTTY); 154 } 155 156 /* 157 * Pass I/O requests to the memory filesystem process. 158 */ 159 int 160 mfs_strategy(v) 161 void *v; 162 { 163 struct vop_strategy_args /* { 164 struct buf *a_bp; 165 } */ *ap = v; 166 register struct buf *bp = ap->a_bp; 167 register struct mfsnode *mfsp; 168 struct vnode *vp; 169 struct proc *p = curproc; /* XXX */ 170 171 if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0) 172 panic("mfs_strategy: bad dev"); 173 mfsp = VTOMFS(vp); 174 /* check for mini-root access */ 175 if (mfsp->mfs_pid == 0) { 176 caddr_t base; 177 178 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT); 179 if (bp->b_flags & B_READ) 180 bcopy(base, bp->b_data, bp->b_bcount); 181 else 182 bcopy(bp->b_data, base, bp->b_bcount); 183 biodone(bp); 184 } else if (mfsp->mfs_pid == p->p_pid) { 185 mfs_doio(bp, mfsp->mfs_baseoff); 186 } else { 187 bp->b_actf = mfsp->mfs_buflist; 188 mfsp->mfs_buflist = bp; 189 wakeup((caddr_t)vp); 190 } 191 return (0); 192 } 193 194 /* 195 * Memory file system I/O. 196 * 197 * Trivial on the HP since buffer has already been mapping into KVA space. 198 */ 199 void 200 mfs_doio(bp, base) 201 register struct buf *bp; 202 caddr_t base; 203 { 204 205 base += (bp->b_blkno << DEV_BSHIFT); 206 if (bp->b_flags & B_READ) 207 bp->b_error = copyin(base, bp->b_data, bp->b_bcount); 208 else 209 bp->b_error = copyout(bp->b_data, base, bp->b_bcount); 210 if (bp->b_error) 211 bp->b_flags |= B_ERROR; 212 biodone(bp); 213 } 214 215 /* 216 * This is a noop, simply returning what one has been given. 217 */ 218 int 219 mfs_bmap(v) 220 void *v; 221 { 222 struct vop_bmap_args /* { 223 struct vnode *a_vp; 224 daddr_t a_bn; 225 struct vnode **a_vpp; 226 daddr_t *a_bnp; 227 int *a_runp; 228 } */ *ap = v; 229 230 if (ap->a_vpp != NULL) 231 *ap->a_vpp = ap->a_vp; 232 if (ap->a_bnp != NULL) 233 *ap->a_bnp = ap->a_bn; 234 return (0); 235 } 236 237 /* 238 * Memory filesystem close routine 239 */ 240 /* ARGSUSED */ 241 int 242 mfs_close(v) 243 void *v; 244 { 245 struct vop_close_args /* { 246 struct vnode *a_vp; 247 int a_fflag; 248 struct ucred *a_cred; 249 struct proc *a_p; 250 } */ *ap = v; 251 register struct vnode *vp = ap->a_vp; 252 register struct mfsnode *mfsp = VTOMFS(vp); 253 register struct buf *bp; 254 int error; 255 256 /* 257 * Finish any pending I/O requests. 258 */ 259 while ((bp = mfsp->mfs_buflist) != NULL) { 260 mfsp->mfs_buflist = bp->b_actf; 261 mfs_doio(bp, mfsp->mfs_baseoff); 262 wakeup((caddr_t)bp); 263 } 264 /* 265 * On last close of a memory filesystem 266 * we must invalidate any in core blocks, so that 267 * we can, free up its vnode. 268 */ 269 if ((error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0)) != 0) 270 return (error); 271 /* 272 * There should be no way to have any more uses of this 273 * vnode, so if we find any other uses, it is a panic. 274 */ 275 if (vp->v_usecount > 1) 276 printf("mfs_close: ref count %d > 1\n", vp->v_usecount); 277 if (vp->v_usecount > 1 || mfsp->mfs_buflist) 278 panic("mfs_close"); 279 /* 280 * Send a request to the filesystem server to exit. 281 */ 282 mfsp->mfs_buflist = (struct buf *)(-1); 283 wakeup((caddr_t)vp); 284 return (0); 285 } 286 287 /* 288 * Memory filesystem inactive routine 289 */ 290 /* ARGSUSED */ 291 int 292 mfs_inactive(v) 293 void *v; 294 { 295 struct vop_inactive_args /* { 296 struct vnode *a_vp; 297 } */ *ap = v; 298 register struct mfsnode *mfsp = VTOMFS(ap->a_vp); 299 300 if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1)) 301 panic("mfs_inactive: not inactive (mfs_buflist %p)", 302 mfsp->mfs_buflist); 303 return (0); 304 } 305 306 /* 307 * Reclaim a memory filesystem devvp so that it can be reused. 308 */ 309 int 310 mfs_reclaim(v) 311 void *v; 312 { 313 struct vop_reclaim_args /* { 314 struct vnode *a_vp; 315 } */ *ap = v; 316 register struct vnode *vp = ap->a_vp; 317 318 FREE(vp->v_data, M_MFSNODE); 319 vp->v_data = NULL; 320 return (0); 321 } 322 323 /* 324 * Print out the contents of an mfsnode. 325 */ 326 int 327 mfs_print(v) 328 void *v; 329 { 330 struct vop_print_args /* { 331 struct vnode *a_vp; 332 } */ *ap = v; 333 register struct mfsnode *mfsp = VTOMFS(ap->a_vp); 334 335 printf("tag VT_MFS, pid %d, base %p, size %ld\n", mfsp->mfs_pid, 336 mfsp->mfs_baseoff, mfsp->mfs_size); 337 return (0); 338 } 339 340 /* 341 * Memory based filesystem initialization. 342 */ 343 void 344 mfs_init() 345 { 346 347 } 348