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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* $NetBSD: mfs_vnops.c,v 1.5 1994/12/14 13:03:52 mycroft Exp $ */
23:
24: /*
25: * Copyright (c) 1989, 1993
26: * The Regents of the University of California. All rights reserved.
27: *
28: * Redistribution and use in source and binary forms, with or without
29: * modification, are permitted provided that the following conditions
30: * are met:
31: * 1. Redistributions of source code must retain the above copyright
32: * notice, this list of conditions and the following disclaimer.
33: * 2. Redistributions in binary form must reproduce the above copyright
34: * notice, this list of conditions and the following disclaimer in the
35: * documentation and/or other materials provided with the distribution.
36: * 3. All advertising materials mentioning features or use of this software
37: * must display the following acknowledgement:
38: * This product includes software developed by the University of
39: * California, Berkeley and its contributors.
40: * 4. Neither the name of the University nor the names of its contributors
41: * may be used to endorse or promote products derived from this software
42: * without specific prior written permission.
43: *
44: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
45: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
48: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54: * SUCH DAMAGE.
55: *
56: * @(#)mfs_vnops.c 8.5 (Berkeley) 7/28/94
57: */
58:
59: #include <sys/param.h>
60: #include <sys/systm.h>
61: #include <sys/time.h>
62: #include <sys/kernel.h>
63: #include <sys/proc.h>
64: #include <sys/buf.h>
65: #include <sys/map.h>
66: #include <sys/vnode.h>
67: #include <sys/malloc.h>
68:
69: #include <miscfs/specfs/specdev.h>
70:
71: #include <machine/vmparam.h>
72:
73: #include <ufs/mfs/mfsnode.h>
74: #include <ufs/mfs/mfsiom.h>
75: #include <ufs/mfs/mfs_extern.h>
76:
77: /*
78: * mfs vnode operations.
79: */
80: int (**mfs_vnodeop_p)();
81: struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
82: { &vop_default_desc, vn_default_error },
83: { &vop_lookup_desc, mfs_lookup }, /* lookup */
84: { &vop_create_desc, mfs_create }, /* create */
85: { &vop_mknod_desc, mfs_mknod }, /* mknod */
86: { &vop_open_desc, mfs_open }, /* open */
87: { &vop_close_desc, mfs_close }, /* close */
88: { &vop_access_desc, mfs_access }, /* access */
89: { &vop_getattr_desc, mfs_getattr }, /* getattr */
90: { &vop_setattr_desc, mfs_setattr }, /* setattr */
91: { &vop_read_desc, mfs_read }, /* read */
92: { &vop_write_desc, mfs_write }, /* write */
93: { &vop_ioctl_desc, mfs_ioctl }, /* ioctl */
94: { &vop_select_desc, mfs_select }, /* select */
95: { &vop_mmap_desc, mfs_mmap }, /* mmap */
96: { &vop_fsync_desc, spec_fsync }, /* fsync */
97: { &vop_seek_desc, mfs_seek }, /* seek */
98: { &vop_remove_desc, mfs_remove }, /* remove */
99: { &vop_link_desc, mfs_link }, /* link */
100: { &vop_rename_desc, mfs_rename }, /* rename */
101: { &vop_mkdir_desc, mfs_mkdir }, /* mkdir */
102: { &vop_rmdir_desc, mfs_rmdir }, /* rmdir */
103: { &vop_symlink_desc, mfs_symlink }, /* symlink */
104: { &vop_readdir_desc, mfs_readdir }, /* readdir */
105: { &vop_readlink_desc, mfs_readlink }, /* readlink */
106: { &vop_abortop_desc, mfs_abortop }, /* abortop */
107: { &vop_inactive_desc, mfs_inactive }, /* inactive */
108: { &vop_reclaim_desc, mfs_reclaim }, /* reclaim */
109: { &vop_lock_desc, mfs_lock }, /* lock */
110: { &vop_unlock_desc, mfs_unlock }, /* unlock */
111: { &vop_bmap_desc, mfs_bmap }, /* bmap */
112: { &vop_strategy_desc, mfs_strategy }, /* strategy */
113: { &vop_print_desc, mfs_print }, /* print */
114: { &vop_islocked_desc, mfs_islocked }, /* islocked */
115: { &vop_pathconf_desc, mfs_pathconf }, /* pathconf */
116: { &vop_advlock_desc, mfs_advlock }, /* advlock */
117: { &vop_blkatoff_desc, mfs_blkatoff }, /* blkatoff */
118: { &vop_valloc_desc, mfs_valloc }, /* valloc */
119: { &vop_vfree_desc, mfs_vfree }, /* vfree */
120: { &vop_truncate_desc, mfs_truncate }, /* truncate */
121: { &vop_update_desc, mfs_update }, /* update */
122: { &vop_bwrite_desc, mfs_bwrite }, /* bwrite */
123: { &vop_pgrd_desc, mfs_pgrg }, /* pager read */
124: { &vop_pgwr_desc, mfs_pgwr }, /* pager write */
125: { (struct vnodeop_desc*)NULL, (int(*)())NULL }
126: };
127: struct vnodeopv_desc mfs_vnodeop_opv_desc =
128: { &mfs_vnodeop_p, mfs_vnodeop_entries };
129:
130: /*
131: * Vnode Operations.
132: *
133: * Open called to allow memory filesystem to initialize and
134: * validate before actual IO. Record our process identifier
135: * so we can tell when we are doing I/O to ourself.
136: */
137: /* ARGSUSED */
138: int
139: mfs_open(ap)
140: struct vop_open_args /* {
141: struct vnode *a_vp;
142: int a_mode;
143: struct ucred *a_cred;
144: struct proc *a_p;
145: } */ *ap;
146: {
147:
148: if (ap->a_vp->v_type != VBLK) {
149: panic("mfs_ioctl not VBLK");
150: /* NOTREACHED */
151: }
152: return (0);
153: }
154:
155: /*
156: * Ioctl operation.
157: */
158: /* ARGSUSED */
159: int
160: mfs_ioctl(ap)
161: struct vop_ioctl_args /* {
162: struct vnode *a_vp;
163: u_long a_command;
164: caddr_t a_data;
165: int a_fflag;
166: struct ucred *a_cred;
167: struct proc *a_p;
168: } */ *ap;
169: {
170:
171: return (ENOTTY);
172: }
173:
174: /*
175: * Pass I/O requests to the memory filesystem process.
176: */
177: int
178: mfs_strategy(ap)
179: struct vop_strategy_args /* {
180: struct buf *a_bp;
181: } */ *ap;
182: {
183: register struct buf *bp = ap->a_bp;
184: register struct mfsnode *mfsp;
185: struct vnode *vp;
186: struct proc *p = curproc; /* XXX */
187:
188: if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
189: panic("mfs_strategy: bad dev");
190: mfsp = VTOMFS(vp);
191: /* check for mini-root access */
192: if (mfsp->mfs_pid == 0) {
193: caddr_t base;
194:
195: base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
196: if (bp->b_flags & B_READ)
197: bcopy(base, bp->b_data, bp->b_bcount);
198: else
199: bcopy(bp->b_data, base, bp->b_bcount);
200: biodone(bp);
201: } else if (mfsp->mfs_pid == p->p_pid) {
202: mfs_doio(bp, mfsp->mfs_baseoff);
203: } else {
204: bp->b_actf = mfsp->mfs_buflist;
205: mfsp->mfs_buflist = bp;
206: wakeup((caddr_t)vp);
207: }
208: return (0);
209: }
210:
211: /*
212: * Memory file system I/O.
213: *
214: * Trivial on the HP since buffer has already been mapping into KVA space.
215: */
216: void
217: mfs_doio(bp, base)
218: register struct buf *bp;
219: caddr_t base;
220: {
221:
222: base += (bp->b_blkno << DEV_BSHIFT);
223: if (bp->b_flags & B_READ)
224: bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
225: else
226: bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
227: if (bp->b_error)
228: bp->b_flags |= B_ERROR;
229: biodone(bp);
230: }
231:
232: /*
233: * This is a noop, simply returning what one has been given.
234: */
235: int
236: mfs_bmap(ap)
237: struct vop_bmap_args /* {
238: struct vnode *a_vp;
239: daddr_t a_bn;
240: struct vnode **a_vpp;
241: daddr_t *a_bnp;
242: int *a_runp;
243: } */ *ap;
244: {
245:
246: if (ap->a_vpp != NULL)
247: *ap->a_vpp = ap->a_vp;
248: if (ap->a_bnp != NULL)
249: *ap->a_bnp = ap->a_bn;
250: return (0);
251: }
252:
253: /*
254: * Memory filesystem close routine
255: */
256: /* ARGSUSED */
257: int
258: mfs_close(ap)
259: struct vop_close_args /* {
260: struct vnode *a_vp;
261: int a_fflag;
262: struct ucred *a_cred;
263: struct proc *a_p;
264: } */ *ap;
265: {
266: register struct vnode *vp = ap->a_vp;
267: register struct mfsnode *mfsp = VTOMFS(vp);
268: register struct buf *bp;
269: int error;
270:
271: /*
272: * Finish any pending I/O requests.
273: */
274: while (bp = mfsp->mfs_buflist) {
275: mfsp->mfs_buflist = bp->b_actf;
276: mfs_doio(bp, mfsp->mfs_baseoff);
277: wakeup((caddr_t)bp);
278: }
279: /*
280: * On last close of a memory filesystem
281: * we must invalidate any in core blocks, so that
282: * we can, free up its vnode.
283: */
284: if (error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0))
285: return (error);
286: /*
287: * There should be no way to have any more uses of this
288: * vnode, so if we find any other uses, it is a panic.
289: */
290: if (vp->v_usecount > 1)
291: printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
292: if (vp->v_usecount > 1 || mfsp->mfs_buflist)
293: panic("mfs_close");
294: /*
295: * Send a request to the filesystem server to exit.
296: */
297: mfsp->mfs_buflist = (struct buf *)(-1);
298: wakeup((caddr_t)vp);
299: return (0);
300: }
301:
302: /*
303: * Memory filesystem inactive routine
304: */
305: /* ARGSUSED */
306: int
307: mfs_inactive(ap)
308: struct vop_inactive_args /* {
309: struct vnode *a_vp;
310: } */ *ap;
311: {
312: register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
313:
314: if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
315: panic("mfs_inactive: not inactive (mfs_buflist %x)",
316: mfsp->mfs_buflist);
317: return (0);
318: }
319:
320: /*
321: * Reclaim a memory filesystem devvp so that it can be reused.
322: */
323: int
324: mfs_reclaim(ap)
325: struct vop_reclaim_args /* {
326: struct vnode *a_vp;
327: } */ *ap;
328: {
329: register struct vnode *vp = ap->a_vp;
330:
331: FREE(vp->v_data, M_MFSNODE);
332: vp->v_data = NULL;
333: return (0);
334: }
335:
336: /*
337: * Print out the contents of an mfsnode.
338: */
339: int
340: mfs_print(ap)
341: struct vop_print_args /* {
342: struct vnode *a_vp;
343: } */ *ap;
344: {
345: register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
346:
347: printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
348: mfsp->mfs_baseoff, mfsp->mfs_size);
349: return (0);
350: }
351:
352: /*
353: * Block device bad operation
354: */
355: int
356: mfs_badop()
357: {
358:
359: panic("mfs_badop called\n");
360: /* NOTREACHED */
361: }
362:
363: /*
364: * Memory based filesystem initialization.
365: */
366: mfs_init()
367: {
368:
369: }
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