Annotation of sys/ufs/mfs/mfs_vnops.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mfs_vnops.c,v 1.28 2007/06/01 23:47:57 deraadt Exp $ */
! 2: /* $NetBSD: mfs_vnops.c,v 1.8 1996/03/17 02:16:32 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1989, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 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. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)mfs_vnops.c 8.5 (Berkeley) 7/28/94
! 33: */
! 34:
! 35: #include <sys/param.h>
! 36: #include <sys/systm.h>
! 37: #include <sys/time.h>
! 38: #include <sys/kernel.h>
! 39: #include <sys/proc.h>
! 40: #include <sys/buf.h>
! 41: #include <sys/vnode.h>
! 42: #include <sys/malloc.h>
! 43:
! 44: #include <miscfs/specfs/specdev.h>
! 45:
! 46: #include <machine/vmparam.h>
! 47:
! 48: #include <ufs/mfs/mfsnode.h>
! 49: #include <ufs/mfs/mfs_extern.h>
! 50:
! 51: /*
! 52: * mfs vnode operations.
! 53: */
! 54: int (**mfs_vnodeop_p)(void *);
! 55: struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
! 56: { &vop_default_desc, vn_default_error },
! 57: { &vop_lookup_desc, mfs_lookup }, /* lookup */
! 58: { &vop_create_desc, mfs_create }, /* create */
! 59: { &vop_mknod_desc, mfs_mknod }, /* mknod */
! 60: { &vop_open_desc, mfs_open }, /* open */
! 61: { &vop_close_desc, mfs_close }, /* close */
! 62: { &vop_access_desc, mfs_access }, /* access */
! 63: { &vop_getattr_desc, mfs_getattr }, /* getattr */
! 64: { &vop_setattr_desc, mfs_setattr }, /* setattr */
! 65: { &vop_read_desc, mfs_read }, /* read */
! 66: { &vop_write_desc, mfs_write }, /* write */
! 67: { &vop_ioctl_desc, mfs_ioctl }, /* ioctl */
! 68: { &vop_poll_desc, mfs_poll }, /* poll */
! 69: { &vop_revoke_desc, mfs_revoke }, /* revoke */
! 70: { &vop_fsync_desc, spec_fsync }, /* fsync */
! 71: { &vop_remove_desc, mfs_remove }, /* remove */
! 72: { &vop_link_desc, mfs_link }, /* link */
! 73: { &vop_rename_desc, mfs_rename }, /* rename */
! 74: { &vop_mkdir_desc, mfs_mkdir }, /* mkdir */
! 75: { &vop_rmdir_desc, mfs_rmdir }, /* rmdir */
! 76: { &vop_symlink_desc, mfs_symlink }, /* symlink */
! 77: { &vop_readdir_desc, mfs_readdir }, /* readdir */
! 78: { &vop_readlink_desc, mfs_readlink }, /* readlink */
! 79: { &vop_abortop_desc, mfs_abortop }, /* abortop */
! 80: { &vop_inactive_desc, mfs_inactive }, /* inactive */
! 81: { &vop_reclaim_desc, mfs_reclaim }, /* reclaim */
! 82: { &vop_lock_desc, mfs_lock }, /* lock */
! 83: { &vop_unlock_desc, mfs_unlock }, /* unlock */
! 84: { &vop_bmap_desc, mfs_bmap }, /* bmap */
! 85: { &vop_strategy_desc, mfs_strategy }, /* strategy */
! 86: { &vop_print_desc, mfs_print }, /* print */
! 87: { &vop_islocked_desc, mfs_islocked }, /* islocked */
! 88: { &vop_pathconf_desc, mfs_pathconf }, /* pathconf */
! 89: { &vop_advlock_desc, mfs_advlock }, /* advlock */
! 90: { &vop_bwrite_desc, mfs_bwrite }, /* bwrite */
! 91: { (struct vnodeop_desc*)NULL, (int(*)(void *))NULL }
! 92: };
! 93: struct vnodeopv_desc mfs_vnodeop_opv_desc =
! 94: { &mfs_vnodeop_p, mfs_vnodeop_entries };
! 95:
! 96: /*
! 97: * Vnode Operations.
! 98: *
! 99: * Open called to allow memory filesystem to initialize and
! 100: * validate before actual IO. Record our process identifier
! 101: * so we can tell when we are doing I/O to ourself.
! 102: */
! 103: /* ARGSUSED */
! 104: int
! 105: mfs_open(void *v)
! 106: {
! 107: #ifdef DIAGNOSTIC
! 108: struct vop_open_args *ap = v;
! 109:
! 110: if (ap->a_vp->v_type != VBLK) {
! 111: panic("mfs_open not VBLK");
! 112: /* NOTREACHED */
! 113: }
! 114: #endif
! 115: return (0);
! 116: }
! 117:
! 118: /*
! 119: * Ioctl operation.
! 120: */
! 121: /* ARGSUSED */
! 122: int
! 123: mfs_ioctl(void *v)
! 124: {
! 125: #if 0
! 126: struct vop_ioctl_args *ap = v;
! 127: #endif
! 128:
! 129: return (ENOTTY);
! 130: }
! 131:
! 132: /*
! 133: * Pass I/O requests to the memory filesystem process.
! 134: */
! 135: int
! 136: mfs_strategy(void *v)
! 137: {
! 138: struct vop_strategy_args *ap = v;
! 139: struct buf *bp = ap->a_bp;
! 140: struct mfsnode *mfsp;
! 141: struct vnode *vp;
! 142: struct proc *p = curproc;
! 143: int s;
! 144:
! 145: if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
! 146: panic("mfs_strategy: bad dev");
! 147:
! 148: mfsp = VTOMFS(vp);
! 149: /* check for mini-root access */
! 150: if (mfsp->mfs_pid == 0) {
! 151: caddr_t base;
! 152:
! 153: base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
! 154: if (bp->b_flags & B_READ)
! 155: bcopy(base, bp->b_data, bp->b_bcount);
! 156: else
! 157: bcopy(bp->b_data, base, bp->b_bcount);
! 158: s = splbio();
! 159: biodone(bp);
! 160: splx(s);
! 161: } else if (p != NULL && mfsp->mfs_pid == p->p_pid) {
! 162: mfs_doio(bp, mfsp->mfs_baseoff);
! 163: } else {
! 164: bp->b_actf = mfsp->mfs_buflist;
! 165: mfsp->mfs_buflist = bp;
! 166: wakeup((caddr_t)vp);
! 167: }
! 168: return (0);
! 169: }
! 170:
! 171: /*
! 172: * Memory file system I/O.
! 173: *
! 174: * Trivial on the HP since buffer has already been mapped into KVA space.
! 175: */
! 176: void
! 177: mfs_doio(struct buf *bp, caddr_t base)
! 178: {
! 179: int s;
! 180:
! 181: base += (bp->b_blkno << DEV_BSHIFT);
! 182: if (bp->b_flags & B_READ)
! 183: bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
! 184: else
! 185: bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
! 186: if (bp->b_error)
! 187: bp->b_flags |= B_ERROR;
! 188: else
! 189: bp->b_resid = 0;
! 190: s = splbio();
! 191: biodone(bp);
! 192: splx(s);
! 193: }
! 194:
! 195: /*
! 196: * This is a noop, simply returning what one has been given.
! 197: */
! 198: int
! 199: mfs_bmap(void *v)
! 200: {
! 201: struct vop_bmap_args *ap = v;
! 202:
! 203: if (ap->a_vpp != NULL)
! 204: *ap->a_vpp = ap->a_vp;
! 205: if (ap->a_bnp != NULL)
! 206: *ap->a_bnp = ap->a_bn;
! 207: if (ap->a_runp != NULL)
! 208: *ap->a_runp = 0;
! 209:
! 210: return (0);
! 211: }
! 212:
! 213: /*
! 214: * Memory filesystem close routine
! 215: */
! 216: /* ARGSUSED */
! 217: int
! 218: mfs_close(void *v)
! 219: {
! 220: struct vop_close_args *ap = v;
! 221: struct vnode *vp = ap->a_vp;
! 222: struct mfsnode *mfsp = VTOMFS(vp);
! 223: struct buf *bp;
! 224: int error;
! 225:
! 226: /*
! 227: * Finish any pending I/O requests.
! 228: */
! 229: while ((bp = mfsp->mfs_buflist) != NULL) {
! 230: mfsp->mfs_buflist = bp->b_actf;
! 231: mfs_doio(bp, mfsp->mfs_baseoff);
! 232: wakeup((caddr_t)bp);
! 233: }
! 234: /*
! 235: * On last close of a memory filesystem
! 236: * we must invalidate any in core blocks, so that
! 237: * we can free up its vnode.
! 238: */
! 239: if ((error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 0, 0)) != 0)
! 240: return (error);
! 241: #ifdef DIAGNOSTIC
! 242: /*
! 243: * There should be no way to have any more uses of this
! 244: * vnode, so if we find any other uses, it is a panic.
! 245: */
! 246: if (vp->v_usecount > 1)
! 247: printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
! 248: if (mfsp->mfs_buflist)
! 249: printf("mfs_close: dirty buffers\n");
! 250: if (vp->v_usecount > 1 || mfsp->mfs_buflist)
! 251: panic("mfs_close");
! 252: #endif
! 253: /*
! 254: * Send a request to the filesystem server to exit.
! 255: */
! 256: mfsp->mfs_buflist = (struct buf *)(-1);
! 257: wakeup((caddr_t)vp);
! 258: return (0);
! 259: }
! 260:
! 261: /*
! 262: * Memory filesystem inactive routine
! 263: */
! 264: /* ARGSUSED */
! 265: int
! 266: mfs_inactive(void *v)
! 267: {
! 268: struct vop_inactive_args *ap = v;
! 269: #ifdef DIAGNOSTIC
! 270: struct mfsnode *mfsp = VTOMFS(ap->a_vp);
! 271:
! 272: if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
! 273: panic("mfs_inactive: not inactive (mfs_buflist %p)",
! 274: mfsp->mfs_buflist);
! 275: #endif
! 276: VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
! 277: return (0);
! 278: }
! 279:
! 280: /*
! 281: * Reclaim a memory filesystem devvp so that it can be reused.
! 282: */
! 283: int
! 284: mfs_reclaim(void *v)
! 285: {
! 286: struct vop_reclaim_args *ap = v;
! 287: struct vnode *vp = ap->a_vp;
! 288:
! 289: free(vp->v_data, M_MFSNODE);
! 290: vp->v_data = NULL;
! 291: return (0);
! 292: }
! 293:
! 294: /*
! 295: * Print out the contents of an mfsnode.
! 296: */
! 297: int
! 298: mfs_print(void *v)
! 299: {
! 300: struct vop_print_args *ap = v;
! 301: struct mfsnode *mfsp = VTOMFS(ap->a_vp);
! 302:
! 303: printf("tag VT_MFS, pid %d, base %p, size %ld\n", mfsp->mfs_pid,
! 304: mfsp->mfs_baseoff, mfsp->mfs_size);
! 305: return (0);
! 306: }
! 307:
! 308: /*
! 309: * Block device bad operation
! 310: */
! 311: int
! 312: mfs_badop(void *v)
! 313: {
! 314: panic("mfs_badop called");
! 315: /* NOTREACHED */
! 316: }
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