Rename functions to avoid conflicts with libc.
[dragonfly.git] / sys / vfs / ufs / ufs_readwrite.c
CommitLineData
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1/*-
2 * Copyright (c) 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 * @(#)ufs_readwrite.c 8.11 (Berkeley) 5/8/95
34 * $FreeBSD: src/sys/ufs/ufs/ufs_readwrite.c,v 1.65.2.14 2003/04/04 22:21:29 tegge Exp $
84204577 35 * $DragonFly: src/sys/vfs/ufs/ufs_readwrite.c,v 1.20 2006/09/03 18:29:17 dillon Exp $
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36 */
37
38#define BLKSIZE(a, b, c) blksize(a, b, c)
39#define FS struct fs
40#define I_FS i_fs
5197887a 41
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42#include <vm/vm.h>
43#include <vm/vm_object.h>
44#include <vm/vm_pager.h>
45#include <vm/vm_map.h>
46#include <vm/vnode_pager.h>
47#include <sys/event.h>
48#include <sys/vmmeter.h>
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49#include <vm/vm_page2.h>
50
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51#include "opt_directio.h"
52
53#define VN_KNOTE(vp, b) \
54 KNOTE((struct klist *)&vp->v_pollinfo.vpi_selinfo.si_note, (b))
55
56#ifdef DIRECTIO
57extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone);
58#endif
59
60/*
61 * Vnode op for reading.
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62 *
63 * ffs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
64 * struct ucred *a_cred)
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65 */
66/* ARGSUSED */
67int
0973c589 68ffs_read(struct vop_read_args *ap)
984263bc 69{
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70 struct vnode *vp;
71 struct inode *ip;
72 struct uio *uio;
73 FS *fs;
984263bc 74 struct buf *bp;
984263bc 75 off_t bytesinfile;
9ba4b517 76 int xfersize, blkoffset;
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77 int error, orig_resid;
78 u_short mode;
79 int seqcount;
80 int ioflag;
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81
82 vp = ap->a_vp;
83 seqcount = ap->a_ioflag >> 16;
84 ip = VTOI(vp);
85 mode = ip->i_mode;
86 uio = ap->a_uio;
87 ioflag = ap->a_ioflag;
88#ifdef DIRECTIO
89 if ((ioflag & IO_DIRECT) != 0) {
90 int workdone;
91
92 error = ffs_rawread(vp, uio, &workdone);
93 if (error || workdone)
94 return error;
95 }
96#endif
97
98#ifdef DIAGNOSTIC
99 if (uio->uio_rw != UIO_READ)
5197887a 100 panic("ffs_read: mode");
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101
102 if (vp->v_type == VLNK) {
103 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
5197887a 104 panic("ffs_read: short symlink");
984263bc 105 } else if (vp->v_type != VREG && vp->v_type != VDIR)
5197887a 106 panic("ffs_read: type %d", vp->v_type);
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107#endif
108 fs = ip->I_FS;
f719c866 109 if ((uint64_t)uio->uio_offset > fs->fs_maxfilesize)
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110 return (EFBIG);
111
112 orig_resid = uio->uio_resid;
113 if (orig_resid <= 0)
114 return (0);
115
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116 bytesinfile = ip->i_size - uio->uio_offset;
117 if (bytesinfile <= 0) {
118 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
119 ip->i_flag |= IN_ACCESS;
120 return 0;
121 }
122
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123 /*
124 * Ok so we couldn't do it all in one vm trick...
125 * so cycle around trying smaller bites..
126 */
127 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
128 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
129 break;
984263bc 130
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131 error = ffs_blkatoff_ra(vp, uio->uio_offset, NULL,
132 &bp, seqcount);
133 if (error)
984263bc 134 break;
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135
136 /*
137 * If IO_DIRECT then set B_DIRECT for the buffer. This
138 * will cause us to attempt to release the buffer later on
139 * and will cause the buffer cache to attempt to free the
140 * underlying pages.
141 */
142 if (ioflag & IO_DIRECT)
143 bp->b_flags |= B_DIRECT;
144
145 /*
146 * We should only get non-zero b_resid when an I/O error
147 * has occurred, which should cause us to break above.
148 * However, if the short read did not cause an error,
149 * then we want to ensure that we do not uiomove bad
150 * or uninitialized data.
151 *
152 * XXX b_resid is only valid when an actual I/O has occured
153 * and may be incorrect if the buffer is B_CACHE or if the
154 * last op on the buffer was a failed write. This KASSERT
155 * is a precursor to removing it from the UFS code.
156 */
157 KASSERT(bp->b_resid == 0, ("bp->b_resid != 0"));
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158
159 /*
160 * Calculate how much data we can copy
161 */
162 blkoffset = blkoff(fs, uio->uio_offset);
163 xfersize = bp->b_bufsize - blkoffset;
164 if (xfersize > uio->uio_resid)
165 xfersize = uio->uio_resid;
166 if (xfersize > bytesinfile)
167 xfersize = bytesinfile;
168 if (xfersize <= 0) {
169 panic("ufs_readwrite: impossible xfersize: %d",
170 xfersize);
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171 }
172
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173 /*
174 * otherwise use the general form
175 */
176 error = uiomove((char *)bp->b_data + blkoffset,
177 (int)xfersize, uio);
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178
179 if (error)
180 break;
181
182 if ((ioflag & (IO_VMIO|IO_DIRECT)) &&
183 (LIST_FIRST(&bp->b_dep) == NULL)) {
184 /*
185 * If there are no dependencies, and it's VMIO,
186 * then we don't need the buf, mark it available
187 * for freeing. The VM has the data.
188 */
189 bp->b_flags |= B_RELBUF;
190 brelse(bp);
191 } else {
192 /*
193 * Otherwise let whoever
194 * made the request take care of
195 * freeing it. We just queue
196 * it onto another list.
197 */
198 bqrelse(bp);
199 }
200 }
201
202 /*
203 * This can only happen in the case of an error
204 * because the loop above resets bp to NULL on each iteration
205 * and on normal completion has not set a new value into it.
206 * so it must have come from a 'break' statement
207 */
208 if (bp != NULL) {
209 if ((ioflag & (IO_VMIO|IO_DIRECT)) &&
210 (LIST_FIRST(&bp->b_dep) == NULL)) {
211 bp->b_flags |= B_RELBUF;
212 brelse(bp);
213 } else {
214 bqrelse(bp);
215 }
216 }
217
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218 if ((error == 0 || uio->uio_resid != orig_resid) &&
219 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
220 ip->i_flag |= IN_ACCESS;
221 return (error);
222}
223
224/*
225 * Vnode op for writing.
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226 *
227 * ffs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
228 * struct ucred *a_cred)
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229 */
230int
0973c589 231ffs_write(struct vop_write_args *ap)
984263bc 232{
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233 struct vnode *vp;
234 struct uio *uio;
235 struct inode *ip;
236 FS *fs;
984263bc 237 struct buf *bp;
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238 ufs_daddr_t lbn;
239 off_t osize;
240 int seqcount;
241 int blkoffset, error, extended, flags, ioflag, resid, size, xfersize;
dadab5e9 242 struct thread *td;
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243
244 extended = 0;
245 seqcount = ap->a_ioflag >> 16;
246 ioflag = ap->a_ioflag;
247 uio = ap->a_uio;
248 vp = ap->a_vp;
249 ip = VTOI(vp);
250
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251#ifdef DIAGNOSTIC
252 if (uio->uio_rw != UIO_WRITE)
5197887a 253 panic("ffs_write: mode");
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254#endif
255
256 switch (vp->v_type) {
257 case VREG:
258 if (ioflag & IO_APPEND)
259 uio->uio_offset = ip->i_size;
b33a2ac2 260 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
984263bc 261 return (EPERM);
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262 /* FALLTHROUGH */
263 case VLNK:
264 break;
265 case VDIR:
5197887a 266 panic("ffs_write: dir write");
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267 break;
268 default:
5197887a 269 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type,
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270 (int)uio->uio_offset,
271 (int)uio->uio_resid
272 );
273 }
274
275 fs = ip->I_FS;
276 if (uio->uio_offset < 0 ||
f719c866 277 (uint64_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) {
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278 return (EFBIG);
279 }
280 /*
281 * Maybe this should be above the vnode op call, but so long as
282 * file servers have no limits, I don't think it matters.
283 */
dadab5e9 284 td = uio->uio_td;
8a8d5d85 285 if (vp->v_type == VREG && td && td->td_proc &&
984263bc 286 uio->uio_offset + uio->uio_resid >
dadab5e9 287 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
84204577 288 ksignal(td->td_proc, SIGXFSZ);
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289 return (EFBIG);
290 }
291
292 resid = uio->uio_resid;
293 osize = ip->i_size;
294
295 /*
296 * NOTE! These B_ flags are actually balloc-only flags, not buffer
f719c866 297 * flags. They are similar to the BA_ flags in fbsd.
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298 */
299 if (seqcount > B_SEQMAX)
300 flags = B_SEQMAX << B_SEQSHIFT;
301 else
302 flags = seqcount << B_SEQSHIFT;
303 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
304 flags |= B_SYNC;
305
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306 for (error = 0; uio->uio_resid > 0;) {
307 lbn = lblkno(fs, uio->uio_offset);
308 blkoffset = blkoff(fs, uio->uio_offset);
309 xfersize = fs->fs_bsize - blkoffset;
310 if (uio->uio_resid < xfersize)
311 xfersize = uio->uio_resid;
312
313 if (uio->uio_offset + xfersize > ip->i_size)
314 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
315
316 /*
317 * We must perform a read-before-write if the transfer
318 * size does not cover the entire buffer.
319 */
320 if (fs->fs_bsize > xfersize)
321 flags |= B_CLRBUF;
322 else
323 flags &= ~B_CLRBUF;
324/* XXX is uio->uio_offset the right thing here? */
325 error = VOP_BALLOC(vp, uio->uio_offset, xfersize,
326 ap->a_cred, flags, &bp);
327 if (error != 0)
328 break;
329 /*
330 * If the buffer is not valid and we did not clear garbage
331 * out above, we have to do so here even though the write
332 * covers the entire buffer in order to avoid a mmap()/write
333 * race where another process may see the garbage prior to
334 * the uiomove() for a write replacing it.
335 */
336 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize)
337 vfs_bio_clrbuf(bp);
338 if (ioflag & IO_DIRECT)
339 bp->b_flags |= B_DIRECT;
340 if (ioflag & IO_NOWDRAIN)
341 bp->b_flags |= B_NOWDRAIN;
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342 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
343 bp->b_flags |= B_NOCACHE;
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344
345 if (uio->uio_offset + xfersize > ip->i_size) {
346 ip->i_size = uio->uio_offset + xfersize;
347 extended = 1;
348 }
349
350 size = BLKSIZE(fs, ip, lbn) - bp->b_resid;
351 if (size < xfersize)
352 xfersize = size;
353
354 error =
355 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
356 if ((ioflag & (IO_VMIO|IO_DIRECT)) &&
357 (LIST_FIRST(&bp->b_dep) == NULL)) {
358 bp->b_flags |= B_RELBUF;
359 }
360
361 /*
362 * If IO_SYNC each buffer is written synchronously. Otherwise
363 * if we have a severe page deficiency write the buffer
364 * asynchronously. Otherwise try to cluster, and if that
365 * doesn't do it then either do an async write (if O_DIRECT),
366 * or a delayed write (if not).
367 */
368
369 if (ioflag & IO_SYNC) {
370 (void)bwrite(bp);
371 } else if (vm_page_count_severe() ||
372 buf_dirty_count_severe() ||
373 (ioflag & IO_ASYNC)) {
374 bp->b_flags |= B_CLUSTEROK;
375 bawrite(bp);
376 } else if (xfersize + blkoffset == fs->fs_bsize) {
377 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
378 bp->b_flags |= B_CLUSTEROK;
54078292 379 cluster_write(bp, (off_t)ip->i_size, seqcount);
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380 } else {
381 bawrite(bp);
382 }
383 } else if (ioflag & IO_DIRECT) {
384 bp->b_flags |= B_CLUSTEROK;
385 bawrite(bp);
386 } else {
387 bp->b_flags |= B_CLUSTEROK;
388 bdwrite(bp);
389 }
390 if (error || xfersize == 0)
391 break;
392 ip->i_flag |= IN_CHANGE | IN_UPDATE;
393 }
394 /*
395 * If we successfully wrote any data, and we are not the superuser
396 * we clear the setuid and setgid bits as a precaution against
397 * tampering.
398 */
399 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
400 ip->i_mode &= ~(ISUID | ISGID);
401 if (resid > uio->uio_resid)
402 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
403 if (error) {
404 if (ioflag & IO_UNIT) {
ac690a1d 405 (void)ffs_truncate(vp, osize, ioflag & IO_SYNC,
87de5057 406 ap->a_cred);
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407 uio->uio_offset -= resid - uio->uio_resid;
408 uio->uio_resid = resid;
409 }
b33a2ac2 410 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) {
ac690a1d 411 error = ffs_update(vp, 1);
b33a2ac2 412 }
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413
414 return (error);
415}
416
417
418/*
419 * get page routine
420 */
421int
0973c589 422ffs_getpages(struct vop_getpages_args *ap)
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423{
424 off_t foff, physoffset;
425 int i, size, bsize;
426 struct vnode *dp, *vp;
427 vm_object_t obj;
428 vm_pindex_t pindex, firstindex;
429 vm_page_t mreq;
430 int bbackwards, bforwards;
431 int pbackwards, pforwards;
432 int firstpage;
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433 off_t reqoffset;
434 off_t doffset;
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435 int poff;
436 int pcount;
437 int rtval;
438 int pagesperblock;
439
440
441 pcount = round_page(ap->a_count) / PAGE_SIZE;
442 mreq = ap->a_m[ap->a_reqpage];
443 firstindex = ap->a_m[0]->pindex;
444
445 /*
446 * if ANY DEV_BSIZE blocks are valid on a large filesystem block,
447 * then the entire page is valid. Since the page may be mapped,
448 * user programs might reference data beyond the actual end of file
449 * occuring within the page. We have to zero that data.
450 */
451 if (mreq->valid) {
452 if (mreq->valid != VM_PAGE_BITS_ALL)
453 vm_page_zero_invalid(mreq, TRUE);
454 for (i = 0; i < pcount; i++) {
455 if (i != ap->a_reqpage) {
456 vm_page_free(ap->a_m[i]);
457 }
458 }
459 return VM_PAGER_OK;
460 }
461
462 vp = ap->a_vp;
463 obj = vp->v_object;
464 bsize = vp->v_mount->mnt_stat.f_iosize;
465 pindex = mreq->pindex;
466 foff = IDX_TO_OFF(pindex) /* + ap->a_offset should be zero */;
467
468 if (bsize < PAGE_SIZE)
469 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
470 ap->a_count,
471 ap->a_reqpage);
472
473 /*
474 * foff is the file offset of the required page
475 * reqlblkno is the logical block that contains the page
54078292 476 * poff is the bytes offset of the page in the logical block
984263bc 477 */
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478 poff = (int)(foff % bsize);
479 reqoffset = foff - poff;
984263bc 480
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481 if (VOP_BMAP(vp, reqoffset, &dp, &doffset,
482 &bforwards, &bbackwards) || (doffset == NOOFFSET)
483 ) {
484 for (i = 0; i < pcount; i++) {
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485 if (i != ap->a_reqpage)
486 vm_page_free(ap->a_m[i]);
487 }
54078292 488 if (doffset == NOOFFSET) {
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489 if ((mreq->flags & PG_ZERO) == 0)
490 vm_page_zero_fill(mreq);
491 vm_page_undirty(mreq);
492 mreq->valid = VM_PAGE_BITS_ALL;
493 return VM_PAGER_OK;
494 } else {
495 return VM_PAGER_ERROR;
496 }
497 }
498
54078292 499 physoffset = doffset + poff;
984263bc 500 pagesperblock = bsize / PAGE_SIZE;
54078292 501
984263bc 502 /*
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503 * find the first page that is contiguous.
504 *
505 * bforwards and bbackwards are the number of contiguous bytes
506 * available before and after the block offset. poff is the page
507 * offset, in bytes, relative to the block offset.
508 *
509 * pforwards and pbackwards are the number of contiguous pages
510 * relative to the requested page, non-inclusive of the requested
511 * page (so a pbackwards and pforwards of 0 indicates just the
512 * requested page).
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513 */
514 firstpage = 0;
515 if (ap->a_count) {
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516 /*
517 * Calculate pbackwards and clean up any requested
518 * pages that are too far back.
519 */
520 pbackwards = (poff + bbackwards) >> PAGE_SHIFT;
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521 if (ap->a_reqpage > pbackwards) {
522 firstpage = ap->a_reqpage - pbackwards;
54078292 523 for (i = 0; i < firstpage; i++)
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524 vm_page_free(ap->a_m[i]);
525 }
526
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527 /*
528 * Calculate pforwards
529 */
530 pforwards = (bforwards - poff - PAGE_SIZE) >> PAGE_SHIFT;
531 if (pforwards < 0)
532 pforwards = 0;
984263bc 533 if (pforwards < (pcount - (ap->a_reqpage + 1))) {
54078292 534 for(i = ap->a_reqpage + pforwards + 1; i < pcount; i++)
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535 vm_page_free(ap->a_m[i]);
536 pcount = ap->a_reqpage + pforwards + 1;
537 }
538
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539 /*
540 * Adjust pcount to be relative to firstpage. All pages prior
541 * to firstpage in the array have been cleaned up.
542 */
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543 pcount -= firstpage;
544 }
545
546 /*
547 * calculate the size of the transfer
548 */
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549 size = pcount * PAGE_SIZE;
550
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551 if ((IDX_TO_OFF(ap->a_m[firstpage]->pindex) + size) > vp->v_filesize) {
552 size = vp->v_filesize - IDX_TO_OFF(ap->a_m[firstpage]->pindex);
54078292 553 }
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554
555 physoffset -= foff;
556 rtval = VOP_GETPAGES(dp, &ap->a_m[firstpage], size,
54078292 557 (ap->a_reqpage - firstpage), physoffset);
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558
559 return (rtval);
560}
561
562/*
563 * put page routine
564 *
565 * XXX By default, wimp out... note that a_offset is ignored (and always
566 * XXX has been).
567 */
568int
0973c589 569ffs_putpages(struct vop_putpages_args *ap)
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570{
571 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
572 ap->a_sync, ap->a_rtvals);
573}