AMD64 - Fix many compile-time warnings. int/ptr type mismatches, %llx, etc.
[dragonfly.git] / sys / vm / vnode_pager.c
CommitLineData
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1/*
2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991 The Regents of the University of California.
4 * All rights reserved.
5 * Copyright (c) 1993, 1994 John S. Dyson
6 * Copyright (c) 1995, David Greenman
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
41 * $FreeBSD: src/sys/vm/vnode_pager.c,v 1.116.2.7 2002/12/31 09:34:51 dillon Exp $
e92ca23a 42 * $DragonFly: src/sys/vm/vnode_pager.c,v 1.43 2008/06/19 23:27:39 dillon Exp $
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43 */
44
45/*
46 * Page to/from files (vnodes).
47 */
48
49/*
50 * TODO:
51 * Implement VOP_GETPAGES/PUTPAGES interface for filesystems. Will
52 * greatly re-simplify the vnode_pager.
53 */
54
55#include <sys/param.h>
56#include <sys/systm.h>
5fd012e0 57#include <sys/kernel.h>
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58#include <sys/proc.h>
59#include <sys/vnode.h>
60#include <sys/mount.h>
61#include <sys/buf.h>
62#include <sys/vmmeter.h>
63#include <sys/conf.h>
06ecca5a 64#include <sys/sfbuf.h>
cdd46d2e 65#include <sys/thread2.h>
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66
67#include <vm/vm.h>
68#include <vm/vm_object.h>
69#include <vm/vm_page.h>
70#include <vm/vm_pager.h>
71#include <vm/vm_map.h>
72#include <vm/vnode_pager.h>
73#include <vm/vm_extern.h>
74
1388df65
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75static void vnode_pager_dealloc (vm_object_t);
76static int vnode_pager_getpages (vm_object_t, vm_page_t *, int, int);
77static void vnode_pager_putpages (vm_object_t, vm_page_t *, int, boolean_t, int *);
78static boolean_t vnode_pager_haspage (vm_object_t, vm_pindex_t, int *, int *);
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79
80struct pagerops vnodepagerops = {
81 NULL,
82 vnode_pager_alloc,
83 vnode_pager_dealloc,
84 vnode_pager_getpages,
85 vnode_pager_putpages,
86 vnode_pager_haspage,
87 NULL
88};
89
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90static struct krate vbadrate = { 1 };
91static struct krate vresrate = { 1 };
92
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93int vnode_pbuf_freecnt = -1; /* start out unlimited */
94
95/*
96 * Allocate (or lookup) pager for a vnode.
97 * Handle is a vnode pointer.
98 */
99vm_object_t
57f7b636 100vnode_pager_alloc(void *handle, off_t size, vm_prot_t prot, off_t offset)
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101{
102 vm_object_t object;
103 struct vnode *vp;
104
105 /*
106 * Pageout to vnode, no can do yet.
107 */
108 if (handle == NULL)
109 return (NULL);
110
111 /*
112 * XXX hack - This initialization should be put somewhere else.
113 */
114 if (vnode_pbuf_freecnt < 0) {
115 vnode_pbuf_freecnt = nswbuf / 2 + 1;
116 }
117
118 vp = (struct vnode *) handle;
119
120 /*
121 * Prevent race condition when allocating the object. This
122 * can happen with NFS vnodes since the nfsnode isn't locked.
123 */
124 while (vp->v_flag & VOLOCK) {
125 vp->v_flag |= VOWANT;
377d4740 126 tsleep(vp, 0, "vnpobj", 0);
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127 }
128 vp->v_flag |= VOLOCK;
129
130 /*
131 * If the object is being terminated, wait for it to
132 * go away.
133 */
134 while (((object = vp->v_object) != NULL) &&
135 (object->flags & OBJ_DEAD)) {
9e12ff11 136 vm_object_dead_sleep(object, "vadead");
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137 }
138
3c37c940 139 if (vp->v_sysref.refcnt <= 0)
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140 panic("vnode_pager_alloc: no vnode reference");
141
142 if (object == NULL) {
143 /*
144 * And an object of the appropriate size
145 */
146 object = vm_object_allocate(OBJT_VNODE, OFF_TO_IDX(round_page(size)));
147 object->flags = 0;
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148 object->handle = handle;
149 vp->v_object = object;
57f7b636 150 vp->v_filesize = size;
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151 } else {
152 object->ref_count++;
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153 if (vp->v_filesize != size) {
154 kprintf("vnode_pager_alloc: Warning, filesize "
155 "mismatch %lld/%lld\n",
156 (long long)vp->v_filesize,
157 (long long)size);
158 }
984263bc 159 }
3c37c940 160 vref(vp);
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161
162 vp->v_flag &= ~VOLOCK;
163 if (vp->v_flag & VOWANT) {
164 vp->v_flag &= ~VOWANT;
165 wakeup(vp);
166 }
167 return (object);
168}
169
170static void
57e43348 171vnode_pager_dealloc(vm_object_t object)
984263bc 172{
5f910b2f 173 struct vnode *vp = object->handle;
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174
175 if (vp == NULL)
176 panic("vnode_pager_dealloc: pager already dealloced");
177
178 vm_object_pip_wait(object, "vnpdea");
179
180 object->handle = NULL;
181 object->type = OBJT_DEAD;
182 vp->v_object = NULL;
57f7b636 183 vp->v_filesize = NOOFFSET;
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184 vp->v_flag &= ~(VTEXT | VOBJBUF);
185}
186
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187/*
188 * Return whether the vnode pager has the requested page. Return the
189 * number of disk-contiguous pages before and after the requested page,
190 * not including the requested page.
191 */
984263bc 192static boolean_t
57e43348 193vnode_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before,
54078292 194 int *after)
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195{
196 struct vnode *vp = object->handle;
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197 off_t loffset;
198 off_t doffset;
199 int voff;
984263bc 200 int bsize;
54078292 201 int error;
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202
203 /*
204 * If no vp or vp is doomed or marked transparent to VM, we do not
205 * have the page.
206 */
5fd012e0 207 if ((vp == NULL) || (vp->v_flag & VRECLAIMED))
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208 return FALSE;
209
210 /*
211 * If filesystem no longer mounted or offset beyond end of file we do
212 * not have the page.
213 */
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214 loffset = IDX_TO_OFF(pindex);
215
57f7b636 216 if (vp->v_mount == NULL || loffset >= vp->v_filesize)
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217 return FALSE;
218
219 bsize = vp->v_mount->mnt_stat.f_iosize;
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220 voff = loffset % bsize;
221
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222 /*
223 * BMAP returns byte counts before and after, where after
224 * is inclusive of the base page. haspage must return page
225 * counts before and after where after does not include the
226 * base page.
227 *
228 * BMAP is allowed to return a *after of 0 for backwards
229 * compatibility. The base page is still considered valid if
230 * no error is returned.
231 */
e92ca23a 232 error = VOP_BMAP(vp, loffset - voff, &doffset, after, before, 0);
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233 if (error) {
234 if (before)
235 *before = 0;
236 if (after)
237 *after = 0;
984263bc 238 return TRUE;
bc823b32 239 }
54078292 240 if (doffset == NOOFFSET)
984263bc 241 return FALSE;
984263bc 242
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243 if (before) {
244 *before = (*before + voff) >> PAGE_SHIFT;
245 }
246 if (after) {
247 *after -= voff;
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248 if (loffset + *after > vp->v_filesize)
249 *after = vp->v_filesize - loffset;
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250 *after >>= PAGE_SHIFT;
251 if (*after < 0)
252 *after = 0;
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253 }
254 return TRUE;
255}
256
257/*
258 * Lets the VM system know about a change in size for a file.
259 * We adjust our own internal size and flush any cached pages in
260 * the associated object that are affected by the size change.
261 *
57f7b636 262 * NOTE: This routine may be invoked as a result of a pager put
984263bc 263 * operation (possibly at object termination time), so we must be careful.
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264 *
265 * NOTE: vp->v_filesize is initialized to NOOFFSET (-1), be sure that
266 * we do not blow up on the case. nsize will always be >= 0, however.
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267 */
268void
57e43348 269vnode_pager_setsize(struct vnode *vp, vm_ooffset_t nsize)
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270{
271 vm_pindex_t nobjsize;
c4b46cb4 272 vm_pindex_t oobjsize;
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273 vm_object_t object = vp->v_object;
274
275 if (object == NULL)
276 return;
277
278 /*
279 * Hasn't changed size
280 */
57f7b636 281 if (nsize == vp->v_filesize)
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282 return;
283
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284 /*
285 * Has changed size. Adjust the VM object's size and v_filesize
286 * before we start scanning pages to prevent new pages from being
287 * allocated during the scan.
288 */
984263bc 289 nobjsize = OFF_TO_IDX(nsize + PAGE_MASK);
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290 oobjsize = object->size;
291 object->size = nobjsize;
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292
293 /*
294 * File has shrunk. Toss any cached pages beyond the new EOF.
295 */
57f7b636 296 if (nsize < vp->v_filesize) {
135bd6a8 297 vp->v_filesize = nsize;
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298 if (nobjsize < oobjsize) {
299 vm_object_page_remove(object, nobjsize, oobjsize,
300 FALSE);
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301 }
302 /*
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303 * This gets rid of garbage at the end of a page that is now
304 * only partially backed by the vnode. Since we are setting
305 * the entire page valid & clean after we are done we have
306 * to be sure that the portion of the page within the file
307 * bounds is already valid. If it isn't then making it
308 * valid would create a corrupt block.
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309 */
310 if (nsize & PAGE_MASK) {
311 vm_offset_t kva;
312 vm_page_t m;
313
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314 do {
315 m = vm_page_lookup(object, OFF_TO_IDX(nsize));
316 } while (m && vm_page_sleep_busy(m, TRUE, "vsetsz"));
317
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318 if (m && m->valid) {
319 int base = (int)nsize & PAGE_MASK;
320 int size = PAGE_SIZE - base;
06ecca5a 321 struct sf_buf *sf;
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322
323 /*
324 * Clear out partial-page garbage in case
325 * the page has been mapped.
326 */
17cde63e 327 vm_page_busy(m);
4f1640d6 328 sf = sf_buf_alloc(m, SFB_CPUPRIVATE);
06ecca5a 329 kva = sf_buf_kva(sf);
984263bc 330 bzero((caddr_t)kva + base, size);
06ecca5a 331 sf_buf_free(sf);
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332
333 /*
334 * XXX work around SMP data integrity race
335 * by unmapping the page from user processes.
336 * The garbage we just cleared may be mapped
337 * to a user process running on another cpu
338 * and this code is not running through normal
339 * I/O channels which handle SMP issues for
340 * us, so unmap page to synchronize all cpus.
341 *
342 * XXX should vm_pager_unmap_page() have
343 * dealt with this?
344 */
345 vm_page_protect(m, VM_PROT_NONE);
346
347 /*
348 * Clear out partial-page dirty bits. This
349 * has the side effect of setting the valid
350 * bits, but that is ok. There are a bunch
351 * of places in the VM system where we expected
352 * m->dirty == VM_PAGE_BITS_ALL. The file EOF
353 * case is one of them. If the page is still
354 * partially dirty, make it fully dirty.
355 *
356 * note that we do not clear out the valid
357 * bits. This would prevent bogus_page
358 * replacement from working properly.
359 */
360 vm_page_set_validclean(m, base, size);
361 if (m->dirty != 0)
362 m->dirty = VM_PAGE_BITS_ALL;
17cde63e 363 vm_page_wakeup(m);
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364 }
365 }
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366 } else {
367 vp->v_filesize = nsize;
984263bc 368 }
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369}
370
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371/*
372 * Release a page busied for a getpages operation. The page may have become
373 * wired (typically due to being used by the buffer cache) or otherwise been
374 * soft-busied and cannot be freed in that case. A held page can still be
375 * freed.
376 */
984263bc 377void
57e43348 378vnode_pager_freepage(vm_page_t m)
984263bc 379{
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380 if (m->busy || m->wire_count) {
381 vm_page_activate(m);
382 vm_page_wakeup(m);
383 } else {
384 vm_page_free(m);
385 }
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386}
387
388/*
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389 * EOPNOTSUPP is no longer legal. For local media VFS's that do not
390 * implement their own VOP_GETPAGES, their VOP_GETPAGES should call to
391 * vnode_pager_generic_getpages() to implement the previous behaviour.
392 *
393 * All other FS's should use the bypass to get to the local media
394 * backing vp's VOP_GETPAGES.
395 */
396static int
57e43348 397vnode_pager_getpages(vm_object_t object, vm_page_t *m, int count, int reqpage)
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398{
399 int rtval;
400 struct vnode *vp;
401 int bytes = count * PAGE_SIZE;
402
403 vp = object->handle;
984263bc 404 rtval = VOP_GETPAGES(vp, m, bytes, reqpage, 0);
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405 if (rtval == EOPNOTSUPP)
406 panic("vnode_pager: vfs's must implement vop_getpages\n");
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407 return rtval;
408}
409
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410/*
411 * This is now called from local media FS's to operate against their
412 * own vnodes if they fail to implement VOP_GETPAGES.
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413 *
414 * With all the caching local media devices do these days there is really
415 * very little point to attempting to restrict the I/O size to contiguous
416 * blocks on-disk, especially if our caller thinks we need all the specified
417 * pages. Just construct and issue a READ.
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418 */
419int
57e43348 420vnode_pager_generic_getpages(struct vnode *vp, vm_page_t *m, int bytecount,
a05863a7 421 int reqpage)
984263bc 422{
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423 struct iovec aiov;
424 struct uio auio;
425 off_t foff;
426 int error;
984263bc 427 int count;
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428 int i;
429 int ioflags;
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430
431 /*
a05863a7 432 * Do not do anything if the vnode is bad.
984263bc 433 */
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434 if (vp->v_mount == NULL)
435 return VM_PAGER_BAD;
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436
437 /*
a05863a7
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438 * Calculate the number of pages. Since we are paging in whole
439 * pages, adjust bytecount to be an integral multiple of the page
440 * size. It will be clipped to the file EOF later on.
984263bc 441 */
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442 bytecount = round_page(bytecount);
443 count = bytecount / PAGE_SIZE;
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444
445 /*
446 * If we have a completely valid page available to us, we can
447 * clean up and return. Otherwise we have to re-read the
448 * media.
8d429613
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449 *
450 * Note that this does not work with NFS, so NFS has its own
451 * getpages routine. The problem is that NFS can have partially
452 * valid pages associated with the buffer cache due to the piecemeal
453 * write support. If we were to fall through and re-read the media
454 * as we do here, dirty data could be lost.
984263bc 455 */
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456 if (m[reqpage]->valid == VM_PAGE_BITS_ALL) {
457 for (i = 0; i < count; i++) {
458 if (i != reqpage)
459 vnode_pager_freepage(m[i]);
460 }
461 return VM_PAGER_OK;
462 }
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463
464 /*
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465 * Discard pages past the file EOF. If the requested page is past
466 * the file EOF we just leave its valid bits set to 0, the caller
467 * expects to maintain ownership of the requested page. If the
468 * entire range is past file EOF discard everything and generate
469 * a pagein error.
984263bc 470 */
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471 foff = IDX_TO_OFF(m[0]->pindex);
472 if (foff >= vp->v_filesize) {
473 for (i = 0; i < count; i++) {
474 if (i != reqpage)
475 vnode_pager_freepage(m[i]);
984263bc 476 }
a05863a7 477 return VM_PAGER_ERROR;
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478 }
479
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480 if (foff + bytecount > vp->v_filesize) {
481 bytecount = vp->v_filesize - foff;
482 i = round_page(bytecount) / PAGE_SIZE;
483 while (count > i) {
484 --count;
485 if (count != reqpage)
486 vnode_pager_freepage(m[count]);
984263bc 487 }
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488 }
489
490 /*
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491 * The size of the transfer is bytecount. bytecount will be an
492 * integral multiple of the page size unless it has been clipped
493 * to the file EOF. The transfer cannot exceed the file EOF.
494 *
495 * When dealing with real devices we must round-up to the device
496 * sector size.
984263bc 497 */
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498 if (vp->v_type == VBLK || vp->v_type == VCHR) {
499 int secmask = vp->v_rdev->si_bsize_phys - 1;
984263bc 500 KASSERT(secmask < PAGE_SIZE, ("vnode_pager_generic_getpages: sector size %d too large\n", secmask + 1));
a05863a7 501 bytecount = (bytecount + secmask) & ~secmask;
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502 }
503
984263bc 504 /*
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505 * Severe hack to avoid deadlocks with the buffer cache
506 */
507 for (i = 0; i < count; ++i) {
508 vm_page_t mt = m[i];
509
510 vm_page_io_start(mt);
511 vm_page_wakeup(mt);
512 }
513
514 /*
a05863a7 515 * Issue the I/O without any read-ahead
984263bc 516 */
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517 ioflags = IO_VMIO;
518 /*ioflags |= IO_SEQMAX << IO_SEQSHIFT;*/
519
520 aiov.iov_base = (caddr_t) 0;
521 aiov.iov_len = bytecount;
522 auio.uio_iov = &aiov;
523 auio.uio_iovcnt = 1;
524 auio.uio_offset = foff;
525 auio.uio_segflg = UIO_NOCOPY;
526 auio.uio_rw = UIO_READ;
527 auio.uio_resid = bytecount;
528 auio.uio_td = NULL;
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529 mycpu->gd_cnt.v_vnodein++;
530 mycpu->gd_cnt.v_vnodepgsin += count;
984263bc 531
a05863a7 532 error = VOP_READ(vp, &auio, ioflags, proc0.p_ucred);
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533
534 /*
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535 * Severe hack to avoid deadlocks with the buffer cache
536 */
537 for (i = 0; i < count; ++i) {
538 vm_page_t mt = m[i];
539
540 while (vm_page_sleep_busy(mt, FALSE, "getpgs"))
541 ;
542 vm_page_busy(mt);
543 vm_page_io_finish(mt);
544 }
545
546 /*
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547 * Calculate the actual number of bytes read and clean up the
548 * page list.
984263bc 549 */
a05863a7 550 bytecount -= auio.uio_resid;
984263bc 551
a05863a7 552 for (i = 0; i < count; ++i) {
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553 vm_page_t mt = m[i];
554
a05863a7 555 if (i != reqpage) {
a55afca2 556 if (error == 0 && mt->valid) {
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557 if (mt->flags & PG_WANTED)
558 vm_page_activate(mt);
559 else
560 vm_page_deactivate(mt);
561 vm_page_wakeup(mt);
562 } else {
563 vnode_pager_freepage(mt);
564 }
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565 } else if (mt->valid == 0) {
566 if (error == 0) {
567 kprintf("page failed but no I/O error page %p object %p pindex %d\n", mt, mt->object, (int) mt->pindex);
568 /* whoops, something happened */
569 error = EINVAL;
570 }
571 } else if (mt->valid != VM_PAGE_BITS_ALL) {
572 /*
573 * Zero-extend the requested page if necessary (if
574 * the filesystem is using a small block size).
575 */
576 vm_page_zero_invalid(mt, TRUE);
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577 }
578 }
579 if (error) {
086c1d7e 580 kprintf("vnode_pager_getpages: I/O read error\n");
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581 }
582 return (error ? VM_PAGER_ERROR : VM_PAGER_OK);
583}
584
585/*
586 * EOPNOTSUPP is no longer legal. For local media VFS's that do not
587 * implement their own VOP_PUTPAGES, their VOP_PUTPAGES should call to
588 * vnode_pager_generic_putpages() to implement the previous behaviour.
589 *
590 * All other FS's should use the bypass to get to the local media
591 * backing vp's VOP_PUTPAGES.
592 */
593static void
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594vnode_pager_putpages(vm_object_t object, vm_page_t *m, int count,
595 boolean_t sync, int *rtvals)
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596{
597 int rtval;
598 struct vnode *vp;
599 int bytes = count * PAGE_SIZE;
600
601 /*
602 * Force synchronous operation if we are extremely low on memory
603 * to prevent a low-memory deadlock. VOP operations often need to
604 * allocate more memory to initiate the I/O ( i.e. do a BMAP
605 * operation ). The swapper handles the case by limiting the amount
606 * of asynchronous I/O, but that sort of solution doesn't scale well
607 * for the vnode pager without a lot of work.
608 *
609 * Also, the backing vnode's iodone routine may not wake the pageout
610 * daemon up. This should be probably be addressed XXX.
611 */
612
12e4aaff 613 if ((vmstats.v_free_count + vmstats.v_cache_count) < vmstats.v_pageout_free_min)
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614 sync |= OBJPC_SYNC;
615
616 /*
617 * Call device-specific putpages function
618 */
619
620 vp = object->handle;
621 rtval = VOP_PUTPAGES(vp, m, bytes, sync, rtvals, 0);
622 if (rtval == EOPNOTSUPP) {
086c1d7e 623 kprintf("vnode_pager: *** WARNING *** stale FS putpages\n");
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624 rtval = vnode_pager_generic_putpages( vp, m, bytes, sync, rtvals);
625 }
626}
627
628
629/*
630 * This is now called from local media FS's to operate against their
631 * own vnodes if they fail to implement VOP_PUTPAGES.
632 *
633 * This is typically called indirectly via the pageout daemon and
634 * clustering has already typically occured, so in general we ask the
635 * underlying filesystem to write the data out asynchronously rather
636 * then delayed.
637 */
638int
57e43348 639vnode_pager_generic_putpages(struct vnode *vp, vm_page_t *m, int bytecount,
a05863a7 640 int flags, int *rtvals)
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641{
642 int i;
643 vm_object_t object;
644 int count;
645
646 int maxsize, ncount;
647 vm_ooffset_t poffset;
648 struct uio auio;
649 struct iovec aiov;
650 int error;
651 int ioflags;
652
653 object = vp->v_object;
654 count = bytecount / PAGE_SIZE;
655
656 for (i = 0; i < count; i++)
657 rtvals[i] = VM_PAGER_AGAIN;
658
659 if ((int) m[0]->pindex < 0) {
086c1d7e 660 kprintf("vnode_pager_putpages: attempt to write meta-data!!! -- 0x%lx(%x)\n",
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661 (long)m[0]->pindex, m[0]->dirty);
662 rtvals[0] = VM_PAGER_BAD;
663 return VM_PAGER_BAD;
664 }
665
666 maxsize = count * PAGE_SIZE;
667 ncount = count;
668
669 poffset = IDX_TO_OFF(m[0]->pindex);
670
671 /*
672 * If the page-aligned write is larger then the actual file we
673 * have to invalidate pages occuring beyond the file EOF. However,
674 * there is an edge case where a file may not be page-aligned where
675 * the last page is partially invalid. In this case the filesystem
676 * may not properly clear the dirty bits for the entire page (which
677 * could be VM_PAGE_BITS_ALL due to the page having been mmap()d).
678 * With the page locked we are free to fix-up the dirty bits here.
679 *
680 * We do not under any circumstances truncate the valid bits, as
681 * this will screw up bogus page replacement.
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682 *
683 * The caller has already read-protected the pages. The VFS must
684 * use the buffer cache to wrap the pages. The pages might not
685 * be immediately flushed by the buffer cache but once under its
686 * control the pages themselves can wind up being marked clean
687 * and their covering buffer cache buffer can be marked dirty.
984263bc 688 */
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689 if (maxsize + poffset > vp->v_filesize) {
690 if (vp->v_filesize > poffset) {
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691 int pgoff;
692
57f7b636 693 maxsize = vp->v_filesize - poffset;
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694 ncount = btoc(maxsize);
695 if ((pgoff = (int)maxsize & PAGE_MASK) != 0) {
696 vm_page_clear_dirty(m[ncount - 1], pgoff,
697 PAGE_SIZE - pgoff);
698 }
699 } else {
700 maxsize = 0;
701 ncount = 0;
702 }
703 if (ncount < count) {
704 for (i = ncount; i < count; i++) {
705 rtvals[i] = VM_PAGER_BAD;
706 }
707 }
708 }
709
710 /*
711 * pageouts are already clustered, use IO_ASYNC to force a bawrite()
712 * rather then a bdwrite() to prevent paging I/O from saturating
713 * the buffer cache. Dummy-up the sequential heuristic to cause
714 * large ranges to cluster. If neither IO_SYNC or IO_ASYNC is set,
715 * the system decides how to cluster.
716 */
717 ioflags = IO_VMIO;
718 if (flags & (VM_PAGER_PUT_SYNC | VM_PAGER_PUT_INVAL))
719 ioflags |= IO_SYNC;
720 else if ((flags & VM_PAGER_CLUSTER_OK) == 0)
721 ioflags |= IO_ASYNC;
722 ioflags |= (flags & VM_PAGER_PUT_INVAL) ? IO_INVAL: 0;
723 ioflags |= IO_SEQMAX << IO_SEQSHIFT;
724
725 aiov.iov_base = (caddr_t) 0;
726 aiov.iov_len = maxsize;
727 auio.uio_iov = &aiov;
728 auio.uio_iovcnt = 1;
729 auio.uio_offset = poffset;
730 auio.uio_segflg = UIO_NOCOPY;
731 auio.uio_rw = UIO_WRITE;
732 auio.uio_resid = maxsize;
dadab5e9 733 auio.uio_td = NULL;
8a8d5d85 734 error = VOP_WRITE(vp, &auio, ioflags, proc0.p_ucred);
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735 mycpu->gd_cnt.v_vnodeout++;
736 mycpu->gd_cnt.v_vnodepgsout += ncount;
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737
738 if (error) {
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739 krateprintf(&vbadrate,
740 "vnode_pager_putpages: I/O error %d\n", error);
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741 }
742 if (auio.uio_resid) {
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743 krateprintf(&vresrate,
744 "vnode_pager_putpages: residual I/O %d at %lu\n",
745 auio.uio_resid, (u_long)m[0]->pindex);
984263bc 746 }
8a63550c 747 for (i = 0; i < ncount; i++)
984263bc 748 rtvals[i] = VM_PAGER_OK;
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749 return rtvals[0];
750}
751
752struct vnode *
dadab5e9 753vnode_pager_lock(vm_object_t object)
984263bc 754{
dadab5e9 755 struct thread *td = curthread; /* XXX */
5fd012e0 756 int error;
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757
758 for (; object != NULL; object = object->backing_object) {
759 if (object->type != OBJT_VNODE)
760 continue;
761 if (object->flags & OBJ_DEAD)
762 return NULL;
763
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764 for (;;) {
765 struct vnode *vp = object->handle;
ab6f251b 766 error = vget(vp, LK_SHARED | LK_RETRY | LK_CANRECURSE);
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767 if (error == 0) {
768 if (object->handle != vp) {
769 vput(vp);
770 continue;
771 }
772 return (vp);
773 }
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774 if ((object->flags & OBJ_DEAD) ||
775 (object->type != OBJT_VNODE)) {
984263bc 776 return NULL;
dadab5e9 777 }
086c1d7e 778 kprintf("vnode_pager_lock: vp %p error %d lockstatus %d, retrying\n", vp, error, lockstatus(&vp->v_lock, td));
5fd012e0 779 tsleep(object->handle, 0, "vnpgrl", hz);
984263bc 780 }
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781 }
782 return NULL;
783}