mfs_vnops.c revision 1.13
1 /* $NetBSD: mfs_vnops.c,v 1.13 1998/03/01 02:23:29 fvdl 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 8.11 (Berkeley) 5/22/95 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_revoke_desc, mfs_revoke }, /* revoke */ 76 { &vop_mmap_desc, mfs_mmap }, /* mmap */ 77 { &vop_fsync_desc, spec_fsync }, /* fsync */ 78 { &vop_seek_desc, mfs_seek }, /* seek */ 79 { &vop_remove_desc, mfs_remove }, /* remove */ 80 { &vop_link_desc, mfs_link }, /* link */ 81 { &vop_rename_desc, mfs_rename }, /* rename */ 82 { &vop_mkdir_desc, mfs_mkdir }, /* mkdir */ 83 { &vop_rmdir_desc, mfs_rmdir }, /* rmdir */ 84 { &vop_symlink_desc, mfs_symlink }, /* symlink */ 85 { &vop_readdir_desc, mfs_readdir }, /* readdir */ 86 { &vop_readlink_desc, mfs_readlink }, /* readlink */ 87 { &vop_abortop_desc, mfs_abortop }, /* abortop */ 88 { &vop_inactive_desc, mfs_inactive }, /* inactive */ 89 { &vop_reclaim_desc, mfs_reclaim }, /* reclaim */ 90 { &vop_lock_desc, mfs_lock }, /* lock */ 91 { &vop_unlock_desc, mfs_unlock }, /* unlock */ 92 { &vop_bmap_desc, mfs_bmap }, /* bmap */ 93 { &vop_strategy_desc, mfs_strategy }, /* strategy */ 94 { &vop_print_desc, mfs_print }, /* print */ 95 { &vop_islocked_desc, mfs_islocked }, /* islocked */ 96 { &vop_pathconf_desc, mfs_pathconf }, /* pathconf */ 97 { &vop_advlock_desc, mfs_advlock }, /* advlock */ 98 { &vop_blkatoff_desc, mfs_blkatoff }, /* blkatoff */ 99 { &vop_valloc_desc, mfs_valloc }, /* valloc */ 100 { &vop_vfree_desc, mfs_vfree }, /* vfree */ 101 { &vop_truncate_desc, mfs_truncate }, /* truncate */ 102 { &vop_update_desc, mfs_update }, /* update */ 103 { &vop_bwrite_desc, mfs_bwrite }, /* bwrite */ 104 { (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL } 105 }; 106 struct vnodeopv_desc mfs_vnodeop_opv_desc = 107 { &mfs_vnodeop_p, mfs_vnodeop_entries }; 108 109 /* 110 * Vnode Operations. 111 * 112 * Open called to allow memory filesystem to initialize and 113 * validate before actual IO. Record our process identifier 114 * so we can tell when we are doing I/O to ourself. 115 */ 116 /* ARGSUSED */ 117 int 118 mfs_open(v) 119 void *v; 120 { 121 struct vop_open_args /* { 122 struct vnode *a_vp; 123 int a_mode; 124 struct ucred *a_cred; 125 struct proc *a_p; 126 } */ *ap = v; 127 128 if (ap->a_vp->v_type != VBLK) { 129 panic("mfs_ioctl not VBLK"); 130 /* NOTREACHED */ 131 } 132 return (0); 133 } 134 135 /* 136 * Ioctl operation. 137 */ 138 /* ARGSUSED */ 139 int 140 mfs_ioctl(v) 141 void *v; 142 { 143 #if 0 144 struct vop_ioctl_args /* { 145 struct vnode *a_vp; 146 u_long a_command; 147 caddr_t a_data; 148 int a_fflag; 149 struct ucred *a_cred; 150 struct proc *a_p; 151 } */ *ap = v; 152 #endif 153 154 return (ENOTTY); 155 } 156 157 /* 158 * Pass I/O requests to the memory filesystem process. 159 */ 160 int 161 mfs_strategy(v) 162 void *v; 163 { 164 struct vop_strategy_args /* { 165 struct buf *a_bp; 166 } */ *ap = v; 167 register struct buf *bp = ap->a_bp; 168 register struct mfsnode *mfsp; 169 struct vnode *vp; 170 struct proc *p = curproc; /* XXX */ 171 172 if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0) 173 panic("mfs_strategy: bad dev"); 174 mfsp = VTOMFS(vp); 175 /* check for mini-root access */ 176 if (mfsp->mfs_pid == 0) { 177 caddr_t base; 178 179 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT); 180 if (bp->b_flags & B_READ) 181 bcopy(base, bp->b_data, bp->b_bcount); 182 else 183 bcopy(bp->b_data, base, bp->b_bcount); 184 biodone(bp); 185 } else if (mfsp->mfs_pid == p->p_pid) { 186 mfs_doio(bp, mfsp->mfs_baseoff); 187 } else { 188 bp->b_actf = mfsp->mfs_buflist; 189 mfsp->mfs_buflist = bp; 190 wakeup((caddr_t)vp); 191 } 192 return (0); 193 } 194 195 /* 196 * Memory file system I/O. 197 * 198 * Trivial on the HP since buffer has already been mapping into KVA space. 199 */ 200 void 201 mfs_doio(bp, base) 202 register struct buf *bp; 203 caddr_t base; 204 { 205 206 base += (bp->b_blkno << DEV_BSHIFT); 207 if (bp->b_flags & B_READ) 208 bp->b_error = copyin(base, bp->b_data, bp->b_bcount); 209 else 210 bp->b_error = copyout(bp->b_data, base, bp->b_bcount); 211 if (bp->b_error) 212 bp->b_flags |= B_ERROR; 213 biodone(bp); 214 } 215 216 /* 217 * This is a noop, simply returning what one has been given. 218 */ 219 int 220 mfs_bmap(v) 221 void *v; 222 { 223 struct vop_bmap_args /* { 224 struct vnode *a_vp; 225 daddr_t a_bn; 226 struct vnode **a_vpp; 227 daddr_t *a_bnp; 228 int *a_runp; 229 } */ *ap = v; 230 231 if (ap->a_vpp != NULL) 232 *ap->a_vpp = ap->a_vp; 233 if (ap->a_bnp != NULL) 234 *ap->a_bnp = ap->a_bn; 235 if (ap->a_runp != NULL) 236 *ap->a_runp = 0; 237 return (0); 238 } 239 240 /* 241 * Memory filesystem close routine 242 */ 243 /* ARGSUSED */ 244 int 245 mfs_close(v) 246 void *v; 247 { 248 struct vop_close_args /* { 249 struct vnode *a_vp; 250 int a_fflag; 251 struct ucred *a_cred; 252 struct proc *a_p; 253 } */ *ap = v; 254 register struct vnode *vp = ap->a_vp; 255 register struct mfsnode *mfsp = VTOMFS(vp); 256 register struct buf *bp; 257 int error; 258 259 /* 260 * Finish any pending I/O requests. 261 */ 262 while ((bp = mfsp->mfs_buflist) != NULL) { 263 mfsp->mfs_buflist = bp->b_actf; 264 mfs_doio(bp, mfsp->mfs_baseoff); 265 wakeup((caddr_t)bp); 266 } 267 /* 268 * On last close of a memory filesystem 269 * we must invalidate any in core blocks, so that 270 * we can, free up its vnode. 271 */ 272 if ((error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0)) != 0) 273 return (error); 274 /* 275 * There should be no way to have any more uses of this 276 * vnode, so if we find any other uses, it is a panic. 277 */ 278 if (vp->v_usecount > 1) 279 printf("mfs_close: ref count %d > 1\n", vp->v_usecount); 280 if (vp->v_usecount > 1 || mfsp->mfs_buflist) 281 panic("mfs_close"); 282 /* 283 * Send a request to the filesystem server to exit. 284 */ 285 mfsp->mfs_buflist = (struct buf *)(-1); 286 wakeup((caddr_t)vp); 287 return (0); 288 } 289 290 /* 291 * Memory filesystem inactive routine 292 */ 293 /* ARGSUSED */ 294 int 295 mfs_inactive(v) 296 void *v; 297 { 298 struct vop_inactive_args /* { 299 struct vnode *a_vp; 300 struct proc *a_p; 301 } */ *ap = v; 302 struct vnode *vp = ap->a_vp; 303 struct mfsnode *mfsp = VTOMFS(vp); 304 305 if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1)) 306 panic("mfs_inactive: not inactive (mfs_buflist %p)", 307 mfsp->mfs_buflist); 308 VOP_UNLOCK(vp, 0); 309 return (0); 310 } 311 312 /* 313 * Reclaim a memory filesystem devvp so that it can be reused. 314 */ 315 int 316 mfs_reclaim(v) 317 void *v; 318 { 319 struct vop_reclaim_args /* { 320 struct vnode *a_vp; 321 } */ *ap = v; 322 register struct vnode *vp = ap->a_vp; 323 324 FREE(vp->v_data, M_MFSNODE); 325 vp->v_data = NULL; 326 return (0); 327 } 328 329 /* 330 * Print out the contents of an mfsnode. 331 */ 332 int 333 mfs_print(v) 334 void *v; 335 { 336 struct vop_print_args /* { 337 struct vnode *a_vp; 338 } */ *ap = v; 339 register struct mfsnode *mfsp = VTOMFS(ap->a_vp); 340 341 printf("tag VT_MFS, pid %d, base %p, size %ld\n", mfsp->mfs_pid, 342 mfsp->mfs_baseoff, mfsp->mfs_size); 343 return (0); 344 } 345
Indexes created Sun Sep 28 16:09:52 GMT 2025