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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* $NetBSD: mfs_vnops.c,v 1.5 1994/12/14 13:03:52 mycroft Exp $ */
26:
27: /*
28: * Copyright (c) 1989, 1993
29: * The Regents of the University of California. All rights reserved.
30: *
31: * Redistribution and use in source and binary forms, with or without
32: * modification, are permitted provided that the following conditions
33: * are met:
34: * 1. Redistributions of source code must retain the above copyright
35: * notice, this list of conditions and the following disclaimer.
36: * 2. Redistributions in binary form must reproduce the above copyright
37: * notice, this list of conditions and the following disclaimer in the
38: * documentation and/or other materials provided with the distribution.
39: * 3. All advertising materials mentioning features or use of this software
40: * must display the following acknowledgement:
41: * This product includes software developed by the University of
42: * California, Berkeley and its contributors.
43: * 4. Neither the name of the University nor the names of its contributors
44: * may be used to endorse or promote products derived from this software
45: * without specific prior written permission.
46: *
47: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
48: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57: * SUCH DAMAGE.
58: *
59: * @(#)mfs_vnops.c 8.5 (Berkeley) 7/28/94
60: */
61:
62: #include <sys/param.h>
63: #include <sys/systm.h>
64: #include <sys/time.h>
65: #include <sys/kernel.h>
66: #include <sys/proc.h>
67: #include <sys/buf.h>
68: #include <sys/map.h>
69: #include <sys/vnode.h>
70: #include <sys/malloc.h>
71:
72: #include <miscfs/specfs/specdev.h>
73:
74: #include <machine/vmparam.h>
75:
76: #include <ufs/mfs/mfsnode.h>
77: #include <ufs/mfs/mfsiom.h>
78: #include <ufs/mfs/mfs_extern.h>
79:
80: /*
81: * mfs vnode operations.
82: */
83: int (**mfs_vnodeop_p)();
84: struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
85: { &vop_default_desc, vn_default_error },
86: { &vop_lookup_desc, mfs_lookup }, /* lookup */
87: { &vop_create_desc, mfs_create }, /* create */
88: { &vop_mknod_desc, mfs_mknod }, /* mknod */
89: { &vop_open_desc, mfs_open }, /* open */
90: { &vop_close_desc, mfs_close }, /* close */
91: { &vop_access_desc, mfs_access }, /* access */
92: { &vop_getattr_desc, mfs_getattr }, /* getattr */
93: { &vop_setattr_desc, mfs_setattr }, /* setattr */
94: { &vop_read_desc, mfs_read }, /* read */
95: { &vop_write_desc, mfs_write }, /* write */
96: { &vop_ioctl_desc, mfs_ioctl }, /* ioctl */
97: { &vop_select_desc, mfs_select }, /* select */
98: { &vop_mmap_desc, mfs_mmap }, /* mmap */
99: { &vop_fsync_desc, spec_fsync }, /* fsync */
100: { &vop_seek_desc, mfs_seek }, /* seek */
101: { &vop_remove_desc, mfs_remove }, /* remove */
102: { &vop_link_desc, mfs_link }, /* link */
103: { &vop_rename_desc, mfs_rename }, /* rename */
104: { &vop_mkdir_desc, mfs_mkdir }, /* mkdir */
105: { &vop_rmdir_desc, mfs_rmdir }, /* rmdir */
106: { &vop_symlink_desc, mfs_symlink }, /* symlink */
107: { &vop_readdir_desc, mfs_readdir }, /* readdir */
108: { &vop_readlink_desc, mfs_readlink }, /* readlink */
109: { &vop_abortop_desc, mfs_abortop }, /* abortop */
110: { &vop_inactive_desc, mfs_inactive }, /* inactive */
111: { &vop_reclaim_desc, mfs_reclaim }, /* reclaim */
112: { &vop_lock_desc, mfs_lock }, /* lock */
113: { &vop_unlock_desc, mfs_unlock }, /* unlock */
114: { &vop_bmap_desc, mfs_bmap }, /* bmap */
115: { &vop_strategy_desc, mfs_strategy }, /* strategy */
116: { &vop_print_desc, mfs_print }, /* print */
117: { &vop_islocked_desc, mfs_islocked }, /* islocked */
118: { &vop_pathconf_desc, mfs_pathconf }, /* pathconf */
119: { &vop_advlock_desc, mfs_advlock }, /* advlock */
120: { &vop_blkatoff_desc, mfs_blkatoff }, /* blkatoff */
121: { &vop_valloc_desc, mfs_valloc }, /* valloc */
122: { &vop_vfree_desc, mfs_vfree }, /* vfree */
123: { &vop_truncate_desc, mfs_truncate }, /* truncate */
124: { &vop_update_desc, mfs_update }, /* update */
125: { &vop_bwrite_desc, mfs_bwrite }, /* bwrite */
126: { &vop_pgrd_desc, mfs_pgrg }, /* pager read */
127: { &vop_pgwr_desc, mfs_pgwr }, /* pager write */
128: { (struct vnodeop_desc*)NULL, (int(*)())NULL }
129: };
130: struct vnodeopv_desc mfs_vnodeop_opv_desc =
131: { &mfs_vnodeop_p, mfs_vnodeop_entries };
132:
133: /*
134: * Vnode Operations.
135: *
136: * Open called to allow memory filesystem to initialize and
137: * validate before actual IO. Record our process identifier
138: * so we can tell when we are doing I/O to ourself.
139: */
140: /* ARGSUSED */
141: int
142: mfs_open(ap)
143: struct vop_open_args /* {
144: struct vnode *a_vp;
145: int a_mode;
146: struct ucred *a_cred;
147: struct proc *a_p;
148: } */ *ap;
149: {
150:
151: if (ap->a_vp->v_type != VBLK) {
152: panic("mfs_ioctl not VBLK");
153: /* NOTREACHED */
154: }
155: return (0);
156: }
157:
158: /*
159: * Ioctl operation.
160: */
161: /* ARGSUSED */
162: int
163: mfs_ioctl(ap)
164: struct vop_ioctl_args /* {
165: struct vnode *a_vp;
166: u_long a_command;
167: caddr_t a_data;
168: int a_fflag;
169: struct ucred *a_cred;
170: struct proc *a_p;
171: } */ *ap;
172: {
173:
174: return (ENOTTY);
175: }
176:
177: /*
178: * Pass I/O requests to the memory filesystem process.
179: */
180: int
181: mfs_strategy(ap)
182: struct vop_strategy_args /* {
183: struct buf *a_bp;
184: } */ *ap;
185: {
186: register struct buf *bp = ap->a_bp;
187: register struct mfsnode *mfsp;
188: struct vnode *vp;
189: struct proc *p = curproc; /* XXX */
190:
191: if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
192: panic("mfs_strategy: bad dev");
193: mfsp = VTOMFS(vp);
194: /* check for mini-root access */
195: if (mfsp->mfs_pid == 0) {
196: caddr_t base;
197:
198: base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
199: if (bp->b_flags & B_READ)
200: bcopy(base, bp->b_data, bp->b_bcount);
201: else
202: bcopy(bp->b_data, base, bp->b_bcount);
203: biodone(bp);
204: } else if (mfsp->mfs_pid == p->p_pid) {
205: mfs_doio(bp, mfsp->mfs_baseoff);
206: } else {
207: bp->b_actf = mfsp->mfs_buflist;
208: mfsp->mfs_buflist = bp;
209: wakeup((caddr_t)vp);
210: }
211: return (0);
212: }
213:
214: /*
215: * Memory file system I/O.
216: *
217: * Trivial on the HP since buffer has already been mapping into KVA space.
218: */
219: void
220: mfs_doio(bp, base)
221: register struct buf *bp;
222: caddr_t base;
223: {
224:
225: base += (bp->b_blkno << DEV_BSHIFT);
226: if (bp->b_flags & B_READ)
227: bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
228: else
229: bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
230: if (bp->b_error)
231: bp->b_flags |= B_ERROR;
232: biodone(bp);
233: }
234:
235: /*
236: * This is a noop, simply returning what one has been given.
237: */
238: int
239: mfs_bmap(ap)
240: struct vop_bmap_args /* {
241: struct vnode *a_vp;
242: daddr_t a_bn;
243: struct vnode **a_vpp;
244: daddr_t *a_bnp;
245: int *a_runp;
246: } */ *ap;
247: {
248:
249: if (ap->a_vpp != NULL)
250: *ap->a_vpp = ap->a_vp;
251: if (ap->a_bnp != NULL)
252: *ap->a_bnp = ap->a_bn;
253: return (0);
254: }
255:
256: /*
257: * Memory filesystem close routine
258: */
259: /* ARGSUSED */
260: int
261: mfs_close(ap)
262: struct vop_close_args /* {
263: struct vnode *a_vp;
264: int a_fflag;
265: struct ucred *a_cred;
266: struct proc *a_p;
267: } */ *ap;
268: {
269: register struct vnode *vp = ap->a_vp;
270: register struct mfsnode *mfsp = VTOMFS(vp);
271: register struct buf *bp;
272: int error;
273:
274: /*
275: * Finish any pending I/O requests.
276: */
277: while (bp = mfsp->mfs_buflist) {
278: mfsp->mfs_buflist = bp->b_actf;
279: mfs_doio(bp, mfsp->mfs_baseoff);
280: wakeup((caddr_t)bp);
281: }
282: /*
283: * On last close of a memory filesystem
284: * we must invalidate any in core blocks, so that
285: * we can, free up its vnode.
286: */
287: if (error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0))
288: return (error);
289: /*
290: * There should be no way to have any more uses of this
291: * vnode, so if we find any other uses, it is a panic.
292: */
293: if (vp->v_usecount > 1)
294: printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
295: if (vp->v_usecount > 1 || mfsp->mfs_buflist)
296: panic("mfs_close");
297: /*
298: * Send a request to the filesystem server to exit.
299: */
300: mfsp->mfs_buflist = (struct buf *)(-1);
301: wakeup((caddr_t)vp);
302: return (0);
303: }
304:
305: /*
306: * Memory filesystem inactive routine
307: */
308: /* ARGSUSED */
309: int
310: mfs_inactive(ap)
311: struct vop_inactive_args /* {
312: struct vnode *a_vp;
313: } */ *ap;
314: {
315: register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
316:
317: if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
318: panic("mfs_inactive: not inactive (mfs_buflist %x)",
319: mfsp->mfs_buflist);
320: return (0);
321: }
322:
323: /*
324: * Reclaim a memory filesystem devvp so that it can be reused.
325: */
326: int
327: mfs_reclaim(ap)
328: struct vop_reclaim_args /* {
329: struct vnode *a_vp;
330: } */ *ap;
331: {
332: register struct vnode *vp = ap->a_vp;
333:
334: FREE(vp->v_data, M_MFSNODE);
335: vp->v_data = NULL;
336: return (0);
337: }
338:
339: /*
340: * Print out the contents of an mfsnode.
341: */
342: int
343: mfs_print(ap)
344: struct vop_print_args /* {
345: struct vnode *a_vp;
346: } */ *ap;
347: {
348: register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
349:
350: printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
351: mfsp->mfs_baseoff, mfsp->mfs_size);
352: return (0);
353: }
354:
355: /*
356: * Block device bad operation
357: */
358: int
359: mfs_badop()
360: {
361:
362: panic("mfs_badop called\n");
363: /* NOTREACHED */
364: }
365:
366: /*
367: * Memory based filesystem initialization.
368: */
369: mfs_init()
370: {
371:
372: }
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