kernel - Adjust UFS and HAMMER to use uiomovebp()
[dragonfly.git] / sys / vfs / ufs / ufs_readwrite.c
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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 $
e92ca23a 35 * $DragonFly: src/sys/vfs/ufs/ufs_readwrite.c,v 1.26 2008/06/19 23:27:39 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>
a55afca2 49#include <sys/sysctl.h>
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50#include <vm/vm_page2.h>
51
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52#include "opt_directio.h"
53
54#define VN_KNOTE(vp, b) \
5b22f1a7 55 KNOTE((struct klist *)&vp->v_pollinfo.vpi_kqinfo.ki_note, (b))
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56
57#ifdef DIRECTIO
58extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone);
59#endif
60
a55afca2 61SYSCTL_DECL(_vfs_ffs);
a55afca2 62
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63/*
64 * Vnode op for reading.
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65 *
66 * ffs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
67 * struct ucred *a_cred)
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68 */
69/* ARGSUSED */
70int
0973c589 71ffs_read(struct vop_read_args *ap)
984263bc 72{
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73 struct vnode *vp;
74 struct inode *ip;
75 struct uio *uio;
76 FS *fs;
984263bc 77 struct buf *bp;
984263bc 78 off_t bytesinfile;
9ba4b517 79 int xfersize, blkoffset;
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80 int error, orig_resid;
81 u_short mode;
82 int seqcount;
83 int ioflag;
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84
85 vp = ap->a_vp;
86 seqcount = ap->a_ioflag >> 16;
87 ip = VTOI(vp);
88 mode = ip->i_mode;
89 uio = ap->a_uio;
90 ioflag = ap->a_ioflag;
91#ifdef DIRECTIO
92 if ((ioflag & IO_DIRECT) != 0) {
93 int workdone;
94
95 error = ffs_rawread(vp, uio, &workdone);
96 if (error || workdone)
97 return error;
98 }
99#endif
100
101#ifdef DIAGNOSTIC
102 if (uio->uio_rw != UIO_READ)
5197887a 103 panic("ffs_read: mode");
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104
105 if (vp->v_type == VLNK) {
106 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
5197887a 107 panic("ffs_read: short symlink");
984263bc 108 } else if (vp->v_type != VREG && vp->v_type != VDIR)
5197887a 109 panic("ffs_read: type %d", vp->v_type);
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110#endif
111 fs = ip->I_FS;
f719c866 112 if ((uint64_t)uio->uio_offset > fs->fs_maxfilesize)
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113 return (EFBIG);
114
115 orig_resid = uio->uio_resid;
116 if (orig_resid <= 0)
117 return (0);
118
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119 bytesinfile = ip->i_size - uio->uio_offset;
120 if (bytesinfile <= 0) {
121 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
122 ip->i_flag |= IN_ACCESS;
123 return 0;
124 }
125
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126 /*
127 * Ok so we couldn't do it all in one vm trick...
128 * so cycle around trying smaller bites..
129 */
130 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
131 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
132 break;
984263bc 133
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134 error = ffs_blkatoff_ra(vp, uio->uio_offset, NULL,
135 &bp, seqcount);
136 if (error)
984263bc 137 break;
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138
139 /*
140 * If IO_DIRECT then set B_DIRECT for the buffer. This
141 * will cause us to attempt to release the buffer later on
142 * and will cause the buffer cache to attempt to free the
143 * underlying pages.
144 */
145 if (ioflag & IO_DIRECT)
146 bp->b_flags |= B_DIRECT;
147
148 /*
149 * We should only get non-zero b_resid when an I/O error
150 * has occurred, which should cause us to break above.
151 * However, if the short read did not cause an error,
152 * then we want to ensure that we do not uiomove bad
153 * or uninitialized data.
154 *
155 * XXX b_resid is only valid when an actual I/O has occured
156 * and may be incorrect if the buffer is B_CACHE or if the
157 * last op on the buffer was a failed write. This KASSERT
158 * is a precursor to removing it from the UFS code.
159 */
160 KASSERT(bp->b_resid == 0, ("bp->b_resid != 0"));
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161
162 /*
163 * Calculate how much data we can copy
164 */
165 blkoffset = blkoff(fs, uio->uio_offset);
166 xfersize = bp->b_bufsize - blkoffset;
167 if (xfersize > uio->uio_resid)
168 xfersize = uio->uio_resid;
169 if (xfersize > bytesinfile)
170 xfersize = bytesinfile;
171 if (xfersize <= 0) {
172 panic("ufs_readwrite: impossible xfersize: %d",
173 xfersize);
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174 }
175
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176 /*
177 * otherwise use the general form
178 */
68cdd773 179 error = uiomovebp(bp, bp->b_data + blkoffset, xfersize, uio);
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180
181 if (error)
182 break;
183
184 if ((ioflag & (IO_VMIO|IO_DIRECT)) &&
185 (LIST_FIRST(&bp->b_dep) == NULL)) {
186 /*
187 * If there are no dependencies, and it's VMIO,
188 * then we don't need the buf, mark it available
189 * for freeing. The VM has the data.
190 */
191 bp->b_flags |= B_RELBUF;
192 brelse(bp);
193 } else {
194 /*
195 * Otherwise let whoever
196 * made the request take care of
197 * freeing it. We just queue
198 * it onto another list.
199 */
200 bqrelse(bp);
201 }
202 }
203
204 /*
205 * This can only happen in the case of an error
206 * because the loop above resets bp to NULL on each iteration
207 * and on normal completion has not set a new value into it.
208 * so it must have come from a 'break' statement
209 */
210 if (bp != NULL) {
211 if ((ioflag & (IO_VMIO|IO_DIRECT)) &&
212 (LIST_FIRST(&bp->b_dep) == NULL)) {
213 bp->b_flags |= B_RELBUF;
214 brelse(bp);
215 } else {
216 bqrelse(bp);
217 }
218 }
219
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220 if ((error == 0 || uio->uio_resid != orig_resid) &&
221 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
222 ip->i_flag |= IN_ACCESS;
223 return (error);
224}
225
226/*
227 * Vnode op for writing.
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228 *
229 * ffs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
230 * struct ucred *a_cred)
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231 */
232int
0973c589 233ffs_write(struct vop_write_args *ap)
984263bc 234{
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235 struct vnode *vp;
236 struct uio *uio;
237 struct inode *ip;
238 FS *fs;
984263bc 239 struct buf *bp;
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240 ufs_daddr_t lbn;
241 off_t osize;
3bb7eedb 242 off_t nsize;
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243 int seqcount;
244 int blkoffset, error, extended, flags, ioflag, resid, size, xfersize;
dadab5e9 245 struct thread *td;
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246
247 extended = 0;
248 seqcount = ap->a_ioflag >> 16;
249 ioflag = ap->a_ioflag;
250 uio = ap->a_uio;
251 vp = ap->a_vp;
252 ip = VTOI(vp);
253
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254#ifdef DIAGNOSTIC
255 if (uio->uio_rw != UIO_WRITE)
5197887a 256 panic("ffs_write: mode");
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257#endif
258
259 switch (vp->v_type) {
260 case VREG:
261 if (ioflag & IO_APPEND)
262 uio->uio_offset = ip->i_size;
b33a2ac2 263 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
984263bc 264 return (EPERM);
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265 /* FALLTHROUGH */
266 case VLNK:
267 break;
268 case VDIR:
5197887a 269 panic("ffs_write: dir write");
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270 break;
271 default:
5197887a 272 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type,
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273 (int)uio->uio_offset,
274 (int)uio->uio_resid
275 );
276 }
277
278 fs = ip->I_FS;
279 if (uio->uio_offset < 0 ||
f719c866 280 (uint64_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) {
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281 return (EFBIG);
282 }
283 /*
284 * Maybe this should be above the vnode op call, but so long as
285 * file servers have no limits, I don't think it matters.
286 */
dadab5e9 287 td = uio->uio_td;
8a8d5d85 288 if (vp->v_type == VREG && td && td->td_proc &&
984263bc 289 uio->uio_offset + uio->uio_resid >
dadab5e9 290 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
7278a846 291 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
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292 return (EFBIG);
293 }
294
295 resid = uio->uio_resid;
296 osize = ip->i_size;
297
298 /*
299 * NOTE! These B_ flags are actually balloc-only flags, not buffer
f719c866 300 * flags. They are similar to the BA_ flags in fbsd.
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301 */
302 if (seqcount > B_SEQMAX)
303 flags = B_SEQMAX << B_SEQSHIFT;
304 else
305 flags = seqcount << B_SEQSHIFT;
306 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
307 flags |= B_SYNC;
308
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309 for (error = 0; uio->uio_resid > 0;) {
310 lbn = lblkno(fs, uio->uio_offset);
311 blkoffset = blkoff(fs, uio->uio_offset);
312 xfersize = fs->fs_bsize - blkoffset;
313 if (uio->uio_resid < xfersize)
314 xfersize = uio->uio_resid;
315
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316 if (uio->uio_offset + xfersize > ip->i_size) {
317 nsize = uio->uio_offset + xfersize;
318 nvnode_pager_setsize(vp, nsize,
319 blkoffresize(fs, nsize), blkoff(fs, nsize));
320 }
984263bc 321
1c9602b3 322#if 0
984263bc 323 /*
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324 * If doing a dummy write to flush the buffer for a
325 * putpages we must perform a read-before-write to
326 * fill in any missing spots and clear any invalid
327 * areas. Otherwise a multi-page buffer may not properly
328 * flush.
329 *
330 * We must clear any invalid areas
331 */
332 if (uio->uio_segflg == UIO_NOCOPY) {
333 error = ffs_blkatoff(vp, uio->uio_offset, NULL, &bp);
334 if (error)
335 break;
336 bqrelse(bp);
337 }
338#endif
339
340 /*
341 * We must clear invalid areas.
984263bc 342 */
8aa7625b 343 if (xfersize < fs->fs_bsize || uio->uio_segflg == UIO_NOCOPY)
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344 flags |= B_CLRBUF;
345 else
346 flags &= ~B_CLRBUF;
347/* XXX is uio->uio_offset the right thing here? */
348 error = VOP_BALLOC(vp, uio->uio_offset, xfersize,
1c9602b3 349 ap->a_cred, flags, &bp);
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350 if (error != 0)
351 break;
352 /*
353 * If the buffer is not valid and we did not clear garbage
354 * out above, we have to do so here even though the write
355 * covers the entire buffer in order to avoid a mmap()/write
356 * race where another process may see the garbage prior to
357 * the uiomove() for a write replacing it.
358 */
8aa7625b 359 if ((bp->b_flags & B_CACHE) == 0 && (flags & B_CLRBUF) == 0)
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360 vfs_bio_clrbuf(bp);
361 if (ioflag & IO_DIRECT)
362 bp->b_flags |= B_DIRECT;
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363 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
364 bp->b_flags |= B_NOCACHE;
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365
366 if (uio->uio_offset + xfersize > ip->i_size) {
367 ip->i_size = uio->uio_offset + xfersize;
368 extended = 1;
369 }
370
371 size = BLKSIZE(fs, ip, lbn) - bp->b_resid;
372 if (size < xfersize)
373 xfersize = size;
374
68cdd773 375 error = uiomovebp(bp, bp->b_data + blkoffset, xfersize, uio);
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376 if ((ioflag & (IO_VMIO|IO_DIRECT)) &&
377 (LIST_FIRST(&bp->b_dep) == NULL)) {
378 bp->b_flags |= B_RELBUF;
379 }
380
381 /*
382 * If IO_SYNC each buffer is written synchronously. Otherwise
383 * if we have a severe page deficiency write the buffer
384 * asynchronously. Otherwise try to cluster, and if that
385 * doesn't do it then either do an async write (if O_DIRECT),
386 * or a delayed write (if not).
387 */
388
389 if (ioflag & IO_SYNC) {
390 (void)bwrite(bp);
391 } else if (vm_page_count_severe() ||
392 buf_dirty_count_severe() ||
393 (ioflag & IO_ASYNC)) {
394 bp->b_flags |= B_CLUSTEROK;
395 bawrite(bp);
396 } else if (xfersize + blkoffset == fs->fs_bsize) {
397 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
398 bp->b_flags |= B_CLUSTEROK;
1c9602b3 399 cluster_write(bp, (off_t)ip->i_size, fs->fs_bsize, seqcount);
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400 } else {
401 bawrite(bp);
402 }
403 } else if (ioflag & IO_DIRECT) {
404 bp->b_flags |= B_CLUSTEROK;
405 bawrite(bp);
406 } else {
407 bp->b_flags |= B_CLUSTEROK;
408 bdwrite(bp);
409 }
410 if (error || xfersize == 0)
411 break;
412 ip->i_flag |= IN_CHANGE | IN_UPDATE;
413 }
414 /*
415 * If we successfully wrote any data, and we are not the superuser
416 * we clear the setuid and setgid bits as a precaution against
417 * tampering.
418 */
419 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
420 ip->i_mode &= ~(ISUID | ISGID);
421 if (resid > uio->uio_resid)
422 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
423 if (error) {
424 if (ioflag & IO_UNIT) {
ac690a1d 425 (void)ffs_truncate(vp, osize, ioflag & IO_SYNC,
87de5057 426 ap->a_cred);
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427 uio->uio_offset -= resid - uio->uio_resid;
428 uio->uio_resid = resid;
429 }
b33a2ac2 430 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) {
ac690a1d 431 error = ffs_update(vp, 1);
b33a2ac2 432 }
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433
434 return (error);
435}
436