1 /* $NetBSD: mfs_vnops.c,v 1.31 2002/09/25 22:21:47 thorpej 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/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: mfs_vnops.c,v 1.31 2002/09/25 22:21:47 thorpej Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/time.h> 44 #include <sys/kernel.h> 45 #include <sys/proc.h> 46 #include <sys/buf.h> 47 #include <sys/vnode.h> 48 #include <sys/malloc.h> 49 50 #include <miscfs/genfs/genfs.h> 51 #include <miscfs/specfs/specdev.h> 52 53 #include <machine/vmparam.h> 54 55 #include <ufs/mfs/mfsnode.h> 56 #include <ufs/mfs/mfs_extern.h> 57 58 /* 59 * mfs vnode operations. 60 */ 61 int (**mfs_vnodeop_p) __P((void *)); 62 const struct vnodeopv_entry_desc mfs_vnodeop_entries[] = { 63 { &vop_default_desc, vn_default_error }, 64 { &vop_lookup_desc, mfs_lookup }, /* lookup */ 65 { &vop_create_desc, mfs_create }, /* create */ 66 { &vop_mknod_desc, mfs_mknod }, /* mknod */ 67 { &vop_open_desc, mfs_open }, /* open */ 68 { &vop_close_desc, mfs_close }, /* close */ 69 { &vop_access_desc, mfs_access }, /* access */ 70 { &vop_getattr_desc, mfs_getattr }, /* getattr */ 71 { &vop_setattr_desc, mfs_setattr }, /* setattr */ 72 { &vop_read_desc, mfs_read }, /* read */ 73 { &vop_write_desc, mfs_write }, /* write */ 74 { &vop_ioctl_desc, mfs_ioctl }, /* ioctl */ 75 { &vop_poll_desc, mfs_poll }, /* poll */ 76 { &vop_revoke_desc, mfs_revoke }, /* revoke */ 77 { &vop_mmap_desc, mfs_mmap }, /* mmap */ 78 { &vop_fsync_desc, spec_fsync }, /* fsync */ 79 { &vop_seek_desc, mfs_seek }, /* seek */ 80 { &vop_remove_desc, mfs_remove }, /* remove */ 81 { &vop_link_desc, mfs_link }, /* link */ 82 { &vop_rename_desc, mfs_rename }, /* rename */ 83 { &vop_mkdir_desc, mfs_mkdir }, /* mkdir */ 84 { &vop_rmdir_desc, mfs_rmdir }, /* rmdir */ 85 { &vop_symlink_desc, mfs_symlink }, /* symlink */ 86 { &vop_readdir_desc, mfs_readdir }, /* readdir */ 87 { &vop_readlink_desc, mfs_readlink }, /* readlink */ 88 { &vop_abortop_desc, mfs_abortop }, /* abortop */ 89 { &vop_inactive_desc, mfs_inactive }, /* inactive */ 90 { &vop_reclaim_desc, mfs_reclaim }, /* reclaim */ 91 { &vop_lock_desc, mfs_lock }, /* lock */ 92 { &vop_unlock_desc, mfs_unlock }, /* unlock */ 93 { &vop_bmap_desc, mfs_bmap }, /* bmap */ 94 { &vop_strategy_desc, mfs_strategy }, /* strategy */ 95 { &vop_print_desc, mfs_print }, /* print */ 96 { &vop_islocked_desc, mfs_islocked }, /* islocked */ 97 { &vop_pathconf_desc, mfs_pathconf }, /* pathconf */ 98 { &vop_advlock_desc, mfs_advlock }, /* advlock */ 99 { &vop_blkatoff_desc, mfs_blkatoff }, /* blkatoff */ 100 { &vop_valloc_desc, mfs_valloc }, /* valloc */ 101 { &vop_vfree_desc, mfs_vfree }, /* vfree */ 102 { &vop_truncate_desc, mfs_truncate }, /* truncate */ 103 { &vop_update_desc, mfs_update }, /* update */ 104 { &vop_bwrite_desc, mfs_bwrite }, /* bwrite */ 105 { &vop_putpages_desc, mfs_putpages }, /* putpages */ 106 { NULL, NULL } 107 }; 108 const struct vnodeopv_desc mfs_vnodeop_opv_desc = 109 { &mfs_vnodeop_p, mfs_vnodeop_entries }; 110 111 /* 112 * Vnode Operations. 113 * 114 * Open called to allow memory filesystem to initialize and 115 * validate before actual IO. Record our process identifier 116 * so we can tell when we are doing I/O to ourself. 117 */ 118 /* ARGSUSED */ 119 int 120 mfs_open(v) 121 void *v; 122 { 123 struct vop_open_args /* { 124 struct vnode *a_vp; 125 int a_mode; 126 struct ucred *a_cred; 127 struct proc *a_p; 128 } */ *ap = v; 129 130 if (ap->a_vp->v_type != VBLK) { 131 panic("mfs_ioctl not VBLK"); 132 /* NOTREACHED */ 133 } 134 return (0); 135 } 136 137 /* 138 * Pass I/O requests to the memory filesystem process. 139 */ 140 int 141 mfs_strategy(v) 142 void *v; 143 { 144 struct vop_strategy_args /* { 145 struct buf *a_bp; 146 } */ *ap = v; 147 struct buf *bp = ap->a_bp; 148 struct mfsnode *mfsp; 149 struct vnode *vp; 150 struct proc *p = curproc; /* XXX */ 151 152 if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0) 153 panic("mfs_strategy: bad dev"); 154 mfsp = VTOMFS(vp); 155 /* check for mini-root access */ 156 if (mfsp->mfs_proc == NULL) { 157 caddr_t base; 158 159 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT); 160 if (bp->b_flags & B_READ) 161 memcpy(bp->b_data, base, bp->b_bcount); 162 else 163 memcpy(base, bp->b_data, bp->b_bcount); 164 bp->b_resid = 0; 165 biodone(bp); 166 } else if (mfsp->mfs_proc == p) { 167 mfs_doio(bp, mfsp->mfs_baseoff); 168 } else if (doing_shutdown) { 169 /* 170 * bitbucket I/O during shutdown. 171 * Note that reads should *not* happen here, but.. 172 */ 173 if (bp->b_flags & B_READ) 174 printf("warning: mfs read during shutdown\n"); 175 bp->b_resid = 0; 176 biodone(bp); 177 } else { 178 BUFQ_PUT(&mfsp->mfs_buflist, bp); 179 wakeup((caddr_t)vp); 180 } 181 return (0); 182 } 183 184 /* 185 * Memory file system I/O. 186 * 187 * Trivial on the HP since buffer has already been mapping into KVA space. 188 */ 189 void 190 mfs_doio(bp, base) 191 struct buf *bp; 192 caddr_t base; 193 { 194 base += (bp->b_blkno << DEV_BSHIFT); 195 if (bp->b_flags & B_READ) 196 bp->b_error = copyin(base, bp->b_data, bp->b_bcount); 197 else 198 bp->b_error = copyout(bp->b_data, base, bp->b_bcount); 199 if (bp->b_error) 200 bp->b_flags |= B_ERROR; 201 else 202 bp->b_resid = 0; 203 biodone(bp); 204 } 205 206 /* 207 * This is a noop, simply returning what one has been given. 208 */ 209 int 210 mfs_bmap(v) 211 void *v; 212 { 213 struct vop_bmap_args /* { 214 struct vnode *a_vp; 215 daddr_t a_bn; 216 struct vnode **a_vpp; 217 daddr_t *a_bnp; 218 int *a_runp; 219 } */ *ap = v; 220 221 if (ap->a_vpp != NULL) 222 *ap->a_vpp = ap->a_vp; 223 if (ap->a_bnp != NULL) 224 *ap->a_bnp = ap->a_bn; 225 if (ap->a_runp != NULL) 226 *ap->a_runp = 0; 227 return (0); 228 } 229 230 /* 231 * Memory filesystem close routine 232 */ 233 /* ARGSUSED */ 234 int 235 mfs_close(v) 236 void *v; 237 { 238 struct vop_close_args /* { 239 struct vnode *a_vp; 240 int a_fflag; 241 struct ucred *a_cred; 242 struct proc *a_p; 243 } */ *ap = v; 244 struct vnode *vp = ap->a_vp; 245 struct mfsnode *mfsp = VTOMFS(vp); 246 struct buf *bp; 247 int error; 248 249 /* 250 * Finish any pending I/O requests. 251 */ 252 while ((bp = BUFQ_GET(&mfsp->mfs_buflist)) != NULL) { 253 mfs_doio(bp, mfsp->mfs_baseoff); 254 wakeup((caddr_t)bp); 255 } 256 /* 257 * On last close of a memory filesystem 258 * we must invalidate any in core blocks, so that 259 * we can, free up its vnode. 260 */ 261 if ((error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0)) != 0) 262 return (error); 263 /* 264 * There should be no way to have any more uses of this 265 * vnode, so if we find any other uses, it is a panic. 266 */ 267 if (vp->v_usecount > 1) 268 printf("mfs_close: ref count %d > 1\n", vp->v_usecount); 269 if (vp->v_usecount > 1 || BUFQ_PEEK(&mfsp->mfs_buflist) != NULL) 270 panic("mfs_close"); 271 /* 272 * Send a request to the filesystem server to exit. 273 */ 274 mfsp->mfs_shutdown = 1; 275 wakeup((caddr_t)vp); 276 return (0); 277 } 278 279 /* 280 * Memory filesystem inactive routine 281 */ 282 /* ARGSUSED */ 283 int 284 mfs_inactive(v) 285 void *v; 286 { 287 struct vop_inactive_args /* { 288 struct vnode *a_vp; 289 struct proc *a_p; 290 } */ *ap = v; 291 struct vnode *vp = ap->a_vp; 292 struct mfsnode *mfsp = VTOMFS(vp); 293 294 if (BUFQ_PEEK(&mfsp->mfs_buflist) != NULL) 295 panic("mfs_inactive: not inactive (mfs_buflist %p)", 296 BUFQ_PEEK(&mfsp->mfs_buflist)); 297 VOP_UNLOCK(vp, 0); 298 return (0); 299 } 300 301 /* 302 * Reclaim a memory filesystem devvp so that it can be reused. 303 */ 304 int 305 mfs_reclaim(v) 306 void *v; 307 { 308 struct vop_reclaim_args /* { 309 struct vnode *a_vp; 310 } */ *ap = v; 311 struct vnode *vp = ap->a_vp; 312 313 FREE(vp->v_data, M_MFSNODE); 314 vp->v_data = NULL; 315 return (0); 316 } 317 318 /* 319 * Print out the contents of an mfsnode. 320 */ 321 int 322 mfs_print(v) 323 void *v; 324 { 325 struct vop_print_args /* { 326 struct vnode *a_vp; 327 } */ *ap = v; 328 struct mfsnode *mfsp = VTOMFS(ap->a_vp); 329 330 printf("tag VT_MFS, pid %d, base %p, size %ld\n", 331 (mfsp->mfs_proc != NULL) ? mfsp->mfs_proc->p_pid : 0, 332 mfsp->mfs_baseoff, mfsp->mfs_size); 333 return (0); 334 } 335