proc->thread stage 5: BUF/VFS clearance! Remove the ucred argument from
[dragonfly.git] / sys / vfs / mfs / mfs_vnops.c
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1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)mfs_vnops.c 8.11 (Berkeley) 5/22/95
34 * $FreeBSD: src/sys/ufs/mfs/mfs_vnops.c,v 1.47.2.1 2001/05/22 02:06:43 bp Exp $
3b568787 35 * $DragonFly: src/sys/vfs/mfs/mfs_vnops.c,v 1.6 2003/06/26 05:55:21 dillon Exp $
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36 */
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/kernel.h>
41#include <sys/proc.h>
42#include <sys/buf.h>
43#include <sys/vnode.h>
44#include <sys/malloc.h>
45#include <sys/sysproto.h>
46#include <sys/mman.h>
47#include <sys/conf.h>
48
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49#include <sys/buf2.h>
50
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51#include <ufs/mfs/mfsnode.h>
52#include <ufs/mfs/mfs_extern.h>
53
54static int mfs_badop __P((struct vop_generic_args *));
55static int mfs_bmap __P((struct vop_bmap_args *));
56static int mfs_close __P((struct vop_close_args *));
57static int mfs_fsync __P((struct vop_fsync_args *));
58static int mfs_freeblks __P((struct vop_freeblks_args *));
59static int mfs_inactive __P((struct vop_inactive_args *)); /* XXX */
60static int mfs_open __P((struct vop_open_args *));
61static int mfs_reclaim __P((struct vop_reclaim_args *)); /* XXX */
62static int mfs_print __P((struct vop_print_args *)); /* XXX */
63static int mfs_strategy __P((struct vop_strategy_args *)); /* XXX */
64static int mfs_getpages __P((struct vop_getpages_args *)); /* XXX */
65/*
66 * mfs vnode operations.
67 */
68vop_t **mfs_vnodeop_p;
69static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
70 { &vop_default_desc, (vop_t *) mfs_badop },
71 { &vop_bmap_desc, (vop_t *) mfs_bmap },
72 { &vop_bwrite_desc, (vop_t *) vop_defaultop },
73 { &vop_close_desc, (vop_t *) mfs_close },
74 { &vop_createvobject_desc, (vop_t *) vop_stdcreatevobject },
75 { &vop_destroyvobject_desc, (vop_t *) vop_stddestroyvobject },
76 { &vop_freeblks_desc, (vop_t *) mfs_freeblks },
77 { &vop_fsync_desc, (vop_t *) mfs_fsync },
78 { &vop_getpages_desc, (vop_t *) mfs_getpages },
79 { &vop_getvobject_desc, (vop_t *) vop_stdgetvobject },
80 { &vop_inactive_desc, (vop_t *) mfs_inactive },
81 { &vop_ioctl_desc, (vop_t *) vop_enotty },
82 { &vop_islocked_desc, (vop_t *) vop_defaultop },
83 { &vop_lock_desc, (vop_t *) vop_defaultop },
84 { &vop_open_desc, (vop_t *) mfs_open },
85 { &vop_print_desc, (vop_t *) mfs_print },
86 { &vop_reclaim_desc, (vop_t *) mfs_reclaim },
87 { &vop_strategy_desc, (vop_t *) mfs_strategy },
88 { &vop_unlock_desc, (vop_t *) vop_defaultop },
89 { NULL, NULL }
90};
91static struct vnodeopv_desc mfs_vnodeop_opv_desc =
92 { &mfs_vnodeop_p, mfs_vnodeop_entries };
93
94VNODEOP_SET(mfs_vnodeop_opv_desc);
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 */
104static int
105mfs_open(ap)
106 struct vop_open_args /* {
107 struct vnode *a_vp;
108 int a_mode;
109 struct ucred *a_cred;
dadab5e9 110 struct thread *a_td;
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111 } */ *ap;
112{
113
114 if (ap->a_vp->v_type != VBLK) {
115 panic("mfs_open not VBLK");
116 /* NOTREACHED */
117 }
118 return (0);
119}
120
121static int
122mfs_fsync(ap)
123 struct vop_fsync_args *ap;
124{
125
126 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_fsync), ap));
127}
128
129/*
130 * mfs_freeblks() - hook to allow us to free physical memory.
131 *
132 * We implement the B_FREEBUF strategy. We can't just madvise()
133 * here because we have to do it in the correct order vs other bio
134 * requests, so we queue it.
135 *
136 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
137 * throw-away on brelse()? XXX
138 */
139
140static int
141mfs_freeblks(ap)
142 struct vop_freeblks_args /* {
143 struct vnode *a_vp;
144 daddr_t a_addr;
145 daddr_t a_length;
146 } */ *ap;
147{
148 struct buf *bp;
149 struct vnode *vp;
150
151 if (!vfinddev(ap->a_vp->v_rdev, VBLK, &vp) || vp->v_usecount == 0)
152 panic("mfs_freeblks: bad dev");
153
154 bp = geteblk(ap->a_length);
155 bp->b_flags |= B_FREEBUF | B_ASYNC;
156 bp->b_dev = ap->a_vp->v_rdev;
157 bp->b_blkno = ap->a_addr;
158 bp->b_offset = dbtob(ap->a_addr);
159 bp->b_bcount = ap->a_length;
160 BUF_KERNPROC(bp);
161 VOP_STRATEGY(vp, bp);
162 return(0);
163}
164
165/*
166 * Pass I/O requests to the memory filesystem process.
167 */
168static int
169mfs_strategy(ap)
170 struct vop_strategy_args /* {
171 struct vnode *a_vp;
172 struct buf *a_bp;
173 } */ *ap;
174{
175 register struct buf *bp = ap->a_bp;
176 register struct mfsnode *mfsp;
177 struct vnode *vp;
dadab5e9 178 struct thread *td = curthread; /* XXX */
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179 int s;
180
181 if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
182 panic("mfs_strategy: bad dev");
183 mfsp = VTOMFS(vp);
184
185 /*
186 * splbio required for queueing/dequeueing, in case of forwarded
187 * BPs from bio interrupts (?). It may not be necessary.
188 */
189
190 s = splbio();
191
dadab5e9 192 if (mfsp->mfs_td == NULL) {
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193 /*
194 * mini-root. Note: B_FREEBUF not supported at the moment,
195 * I'm not sure what kind of dataspace b_data is in.
196 */
197 caddr_t base;
198
199 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
200 if (bp->b_flags & B_FREEBUF)
201 ;
202 if (bp->b_flags & B_READ)
203 bcopy(base, bp->b_data, bp->b_bcount);
204 else
205 bcopy(bp->b_data, base, bp->b_bcount);
206 biodone(bp);
dadab5e9 207 } else if (mfsp->mfs_td == td) {
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208 /*
209 * VOP to self
210 */
211 splx(s);
212 mfs_doio(bp, mfsp);
213 s = splbio();
214 } else {
215 /*
216 * VOP from some other process, queue to MFS process and
217 * wake it up.
218 */
219 bufq_insert_tail(&mfsp->buf_queue, bp);
220 wakeup((caddr_t)vp);
221 }
222 splx(s);
223 return (0);
224}
225
226/*
227 * Memory file system I/O.
228 *
229 * Trivial on the HP since buffer has already been mapping into KVA space.
230 *
231 * Read and Write are handled with a simple copyin and copyout.
232 *
233 * We also partially support VOP_FREEBLKS() via B_FREEBUF. We can't implement
234 * completely -- for example, on fragments or inode metadata, but we can
235 * implement it for page-aligned requests.
236 */
237void
238mfs_doio(bp, mfsp)
239 register struct buf *bp;
240 struct mfsnode *mfsp;
241{
242 caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
243
244 if (bp->b_flags & B_FREEBUF) {
245 /*
246 * Implement B_FREEBUF, which allows the filesystem to tell
247 * a block device when blocks are no longer needed (like when
248 * a file is deleted). We use the hook to MADV_FREE the VM.
249 * This makes an MFS filesystem work as well or better then
250 * a sun-style swap-mounted filesystem.
251 */
252 int bytes = bp->b_bcount;
253
254 if ((vm_offset_t)base & PAGE_MASK) {
255 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
256 bytes -= n;
257 base += n;
258 }
259 if (bytes > 0) {
260 struct madvise_args uap;
261
262 bytes &= ~PAGE_MASK;
263 if (bytes != 0) {
264 bzero(&uap, sizeof(uap));
265 uap.addr = base;
266 uap.len = bytes;
267 uap.behav = MADV_FREE;
41c20dac 268 madvise(&uap);
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269 }
270 }
271 bp->b_error = 0;
272 } else if (bp->b_flags & B_READ) {
273 /*
274 * Read data from our 'memory' disk
275 */
276 bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
277 } else {
278 /*
279 * Write data to our 'memory' disk
280 */
281 bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
282 }
283 if (bp->b_error)
284 bp->b_flags |= B_ERROR;
285 biodone(bp);
286}
287
288/*
289 * This is a noop, simply returning what one has been given.
290 */
291static int
292mfs_bmap(ap)
293 struct vop_bmap_args /* {
294 struct vnode *a_vp;
295 ufs_daddr_t a_bn;
296 struct vnode **a_vpp;
297 ufs_daddr_t *a_bnp;
298 int *a_runp;
299 } */ *ap;
300{
301
302 if (ap->a_vpp != NULL)
303 *ap->a_vpp = ap->a_vp;
304 if (ap->a_bnp != NULL)
305 *ap->a_bnp = ap->a_bn;
306 if (ap->a_runp != NULL)
307 *ap->a_runp = 0;
308 return (0);
309}
310
311/*
312 * Memory filesystem close routine
313 */
314/* ARGSUSED */
315static int
316mfs_close(ap)
317 struct vop_close_args /* {
318 struct vnode *a_vp;
319 int a_fflag;
320 struct ucred *a_cred;
dadab5e9 321 struct thread *a_td;
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322 } */ *ap;
323{
324 register struct vnode *vp = ap->a_vp;
325 register struct mfsnode *mfsp = VTOMFS(vp);
326 register struct buf *bp;
327 int error;
328
329 /*
330 * Finish any pending I/O requests.
331 */
332 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
333 bufq_remove(&mfsp->buf_queue, bp);
334 mfs_doio(bp, mfsp);
335 wakeup((caddr_t)bp);
336 }
337 /*
338 * On last close of a memory filesystem
339 * we must invalidate any in core blocks, so that
340 * we can, free up its vnode.
341 */
3b568787 342 if ((error = vinvalbuf(vp, 1, ap->a_td, 0, 0)) != 0)
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343 return (error);
344 /*
345 * There should be no way to have any more uses of this
346 * vnode, so if we find any other uses, it is a panic.
347 */
348 if (vp->v_usecount > 1)
349 printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
350 if (vp->v_usecount > 1 || (bufq_first(&mfsp->buf_queue) != NULL))
351 panic("mfs_close");
352 /*
353 * Send a request to the filesystem server to exit.
354 */
355 mfsp->mfs_active = 0;
356 wakeup((caddr_t)vp);
357 return (0);
358}
359
360/*
361 * Memory filesystem inactive routine
362 */
363/* ARGSUSED */
364static int
365mfs_inactive(ap)
366 struct vop_inactive_args /* {
367 struct vnode *a_vp;
dadab5e9 368 struct thread *a_td;
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369 } */ *ap;
370{
371 struct vnode *vp = ap->a_vp;
372 struct mfsnode *mfsp = VTOMFS(vp);
373
374 if (bufq_first(&mfsp->buf_queue) != NULL)
375 panic("mfs_inactive: not inactive (next buffer %p)",
376 bufq_first(&mfsp->buf_queue));
dadab5e9 377 VOP_UNLOCK(vp, 0, ap->a_td);
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378 return (0);
379}
380
381/*
382 * Reclaim a memory filesystem devvp so that it can be reused.
383 */
384static int
385mfs_reclaim(ap)
386 struct vop_reclaim_args /* {
387 struct vnode *a_vp;
388 } */ *ap;
389{
390 register struct vnode *vp = ap->a_vp;
391
392 FREE(vp->v_data, M_MFSNODE);
393 vp->v_data = NULL;
394 return (0);
395}
396
397/*
398 * Print out the contents of an mfsnode.
399 */
400static int
401mfs_print(ap)
402 struct vop_print_args /* {
403 struct vnode *a_vp;
404 } */ *ap;
405{
406 register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
407
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408 printf("tag VT_MFS, td %p, base %p, size %ld\n",
409 mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
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410 return (0);
411}
412
413/*
414 * Block device bad operation
415 */
416static int
417mfs_badop(struct vop_generic_args *ap)
418{
419 int i;
420
421 printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
422 i = vop_defaultop(ap);
423 printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name,i);
424 return (i);
425}
426
427
428static int
429mfs_getpages(ap)
430 struct vop_getpages_args *ap;
431{
432
433 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_getpages), ap));
434}