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3742 zfs comments need cleaner, more consistent style
Submitted by: Will Andrews <willa@spectralogic.com>
Submitted by: Alan Somers <alans@spectralogic.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
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--- old/usr/src/uts/common/fs/zfs/zfs_vnops.c
+++ new/usr/src/uts/common/fs/zfs/zfs_vnops.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 24 */
25 25
26 26 /* Portions Copyright 2007 Jeremy Teo */
27 27 /* Portions Copyright 2010 Robert Milkowski */
28 28
29 29 #include <sys/types.h>
30 30 #include <sys/param.h>
31 31 #include <sys/time.h>
32 32 #include <sys/systm.h>
33 33 #include <sys/sysmacros.h>
34 34 #include <sys/resource.h>
35 35 #include <sys/vfs.h>
36 36 #include <sys/vfs_opreg.h>
37 37 #include <sys/vnode.h>
38 38 #include <sys/file.h>
39 39 #include <sys/stat.h>
40 40 #include <sys/kmem.h>
41 41 #include <sys/taskq.h>
42 42 #include <sys/uio.h>
43 43 #include <sys/vmsystm.h>
44 44 #include <sys/atomic.h>
45 45 #include <sys/vm.h>
46 46 #include <vm/seg_vn.h>
47 47 #include <vm/pvn.h>
48 48 #include <vm/as.h>
49 49 #include <vm/kpm.h>
50 50 #include <vm/seg_kpm.h>
51 51 #include <sys/mman.h>
52 52 #include <sys/pathname.h>
53 53 #include <sys/cmn_err.h>
54 54 #include <sys/errno.h>
55 55 #include <sys/unistd.h>
56 56 #include <sys/zfs_dir.h>
57 57 #include <sys/zfs_acl.h>
58 58 #include <sys/zfs_ioctl.h>
59 59 #include <sys/fs/zfs.h>
60 60 #include <sys/dmu.h>
61 61 #include <sys/dmu_objset.h>
62 62 #include <sys/spa.h>
63 63 #include <sys/txg.h>
64 64 #include <sys/dbuf.h>
65 65 #include <sys/zap.h>
66 66 #include <sys/sa.h>
67 67 #include <sys/dirent.h>
68 68 #include <sys/policy.h>
69 69 #include <sys/sunddi.h>
70 70 #include <sys/filio.h>
71 71 #include <sys/sid.h>
72 72 #include "fs/fs_subr.h"
73 73 #include <sys/zfs_ctldir.h>
74 74 #include <sys/zfs_fuid.h>
75 75 #include <sys/zfs_sa.h>
76 76 #include <sys/dnlc.h>
77 77 #include <sys/zfs_rlock.h>
78 78 #include <sys/extdirent.h>
79 79 #include <sys/kidmap.h>
80 80 #include <sys/cred.h>
81 81 #include <sys/attr.h>
82 82
83 83 /*
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84 84 * Programming rules.
85 85 *
86 86 * Each vnode op performs some logical unit of work. To do this, the ZPL must
87 87 * properly lock its in-core state, create a DMU transaction, do the work,
88 88 * record this work in the intent log (ZIL), commit the DMU transaction,
89 89 * and wait for the intent log to commit if it is a synchronous operation.
90 90 * Moreover, the vnode ops must work in both normal and log replay context.
91 91 * The ordering of events is important to avoid deadlocks and references
92 92 * to freed memory. The example below illustrates the following Big Rules:
93 93 *
94 - * (1) A check must be made in each zfs thread for a mounted file system.
94 + * (1) A check must be made in each zfs thread for a mounted file system.
95 95 * This is done avoiding races using ZFS_ENTER(zfsvfs).
96 - * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
97 - * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
98 - * can return EIO from the calling function.
96 + * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
97 + * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
98 + * can return EIO from the calling function.
99 99 *
100 100 * (2) VN_RELE() should always be the last thing except for zil_commit()
101 101 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
102 102 * First, if it's the last reference, the vnode/znode
103 103 * can be freed, so the zp may point to freed memory. Second, the last
104 104 * reference will call zfs_zinactive(), which may induce a lot of work --
105 105 * pushing cached pages (which acquires range locks) and syncing out
106 106 * cached atime changes. Third, zfs_zinactive() may require a new tx,
107 107 * which could deadlock the system if you were already holding one.
108 108 * If you must call VN_RELE() within a tx then use VN_RELE_ASYNC().
109 109 *
110 110 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
111 111 * as they can span dmu_tx_assign() calls.
112 112 *
113 113 * (4) Always pass TXG_NOWAIT as the second argument to dmu_tx_assign().
114 114 * This is critical because we don't want to block while holding locks.
115 115 * Note, in particular, that if a lock is sometimes acquired before
116 116 * the tx assigns, and sometimes after (e.g. z_lock), then failing to
117 117 * use a non-blocking assign can deadlock the system. The scenario:
118 118 *
119 119 * Thread A has grabbed a lock before calling dmu_tx_assign().
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120 120 * Thread B is in an already-assigned tx, and blocks for this lock.
121 121 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
122 122 * forever, because the previous txg can't quiesce until B's tx commits.
123 123 *
124 124 * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT,
125 125 * then drop all locks, call dmu_tx_wait(), and try again.
126 126 *
127 127 * (5) If the operation succeeded, generate the intent log entry for it
128 128 * before dropping locks. This ensures that the ordering of events
129 129 * in the intent log matches the order in which they actually occurred.
130 - * During ZIL replay the zfs_log_* functions will update the sequence
130 + * During ZIL replay the zfs_log_* functions will update the sequence
131 131 * number to indicate the zil transaction has replayed.
132 132 *
133 133 * (6) At the end of each vnode op, the DMU tx must always commit,
134 134 * regardless of whether there were any errors.
135 135 *
136 136 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
137 137 * to ensure that synchronous semantics are provided when necessary.
138 138 *
139 139 * In general, this is how things should be ordered in each vnode op:
140 140 *
141 141 * ZFS_ENTER(zfsvfs); // exit if unmounted
142 142 * top:
143 143 * zfs_dirent_lock(&dl, ...) // lock directory entry (may VN_HOLD())
144 144 * rw_enter(...); // grab any other locks you need
145 145 * tx = dmu_tx_create(...); // get DMU tx
146 146 * dmu_tx_hold_*(); // hold each object you might modify
147 147 * error = dmu_tx_assign(tx, TXG_NOWAIT); // try to assign
148 148 * if (error) {
149 149 * rw_exit(...); // drop locks
150 150 * zfs_dirent_unlock(dl); // unlock directory entry
151 151 * VN_RELE(...); // release held vnodes
152 152 * if (error == ERESTART) {
153 153 * dmu_tx_wait(tx);
154 154 * dmu_tx_abort(tx);
155 155 * goto top;
156 156 * }
157 157 * dmu_tx_abort(tx); // abort DMU tx
158 158 * ZFS_EXIT(zfsvfs); // finished in zfs
159 159 * return (error); // really out of space
160 160 * }
161 161 * error = do_real_work(); // do whatever this VOP does
162 162 * if (error == 0)
163 163 * zfs_log_*(...); // on success, make ZIL entry
164 164 * dmu_tx_commit(tx); // commit DMU tx -- error or not
165 165 * rw_exit(...); // drop locks
166 166 * zfs_dirent_unlock(dl); // unlock directory entry
167 167 * VN_RELE(...); // release held vnodes
168 168 * zil_commit(zilog, foid); // synchronous when necessary
169 169 * ZFS_EXIT(zfsvfs); // finished in zfs
170 170 * return (error); // done, report error
171 171 */
172 172
173 173 /* ARGSUSED */
174 174 static int
175 175 zfs_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
176 176 {
177 177 znode_t *zp = VTOZ(*vpp);
178 178 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
179 179
180 180 ZFS_ENTER(zfsvfs);
181 181 ZFS_VERIFY_ZP(zp);
182 182
183 183 if ((flag & FWRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
184 184 ((flag & FAPPEND) == 0)) {
185 185 ZFS_EXIT(zfsvfs);
186 186 return (SET_ERROR(EPERM));
187 187 }
188 188
189 189 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
190 190 ZTOV(zp)->v_type == VREG &&
191 191 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
192 192 if (fs_vscan(*vpp, cr, 0) != 0) {
193 193 ZFS_EXIT(zfsvfs);
194 194 return (SET_ERROR(EACCES));
195 195 }
196 196 }
197 197
198 198 /* Keep a count of the synchronous opens in the znode */
199 199 if (flag & (FSYNC | FDSYNC))
200 200 atomic_inc_32(&zp->z_sync_cnt);
201 201
202 202 ZFS_EXIT(zfsvfs);
203 203 return (0);
204 204 }
205 205
206 206 /* ARGSUSED */
207 207 static int
208 208 zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr,
209 209 caller_context_t *ct)
210 210 {
211 211 znode_t *zp = VTOZ(vp);
212 212 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
213 213
214 214 /*
215 215 * Clean up any locks held by this process on the vp.
216 216 */
217 217 cleanlocks(vp, ddi_get_pid(), 0);
218 218 cleanshares(vp, ddi_get_pid());
219 219
220 220 ZFS_ENTER(zfsvfs);
221 221 ZFS_VERIFY_ZP(zp);
222 222
223 223 /* Decrement the synchronous opens in the znode */
224 224 if ((flag & (FSYNC | FDSYNC)) && (count == 1))
225 225 atomic_dec_32(&zp->z_sync_cnt);
226 226
227 227 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
228 228 ZTOV(zp)->v_type == VREG &&
229 229 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
230 230 VERIFY(fs_vscan(vp, cr, 1) == 0);
231 231
232 232 ZFS_EXIT(zfsvfs);
233 233 return (0);
234 234 }
235 235
236 236 /*
237 237 * Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and
238 238 * data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter.
239 239 */
240 240 static int
241 241 zfs_holey(vnode_t *vp, int cmd, offset_t *off)
242 242 {
243 243 znode_t *zp = VTOZ(vp);
244 244 uint64_t noff = (uint64_t)*off; /* new offset */
245 245 uint64_t file_sz;
246 246 int error;
247 247 boolean_t hole;
248 248
249 249 file_sz = zp->z_size;
250 250 if (noff >= file_sz) {
251 251 return (SET_ERROR(ENXIO));
252 252 }
253 253
254 254 if (cmd == _FIO_SEEK_HOLE)
255 255 hole = B_TRUE;
256 256 else
257 257 hole = B_FALSE;
258 258
259 259 error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff);
260 260
261 261 /* end of file? */
262 262 if ((error == ESRCH) || (noff > file_sz)) {
263 263 /*
264 264 * Handle the virtual hole at the end of file.
265 265 */
266 266 if (hole) {
267 267 *off = file_sz;
268 268 return (0);
269 269 }
270 270 return (SET_ERROR(ENXIO));
271 271 }
272 272
273 273 if (noff < *off)
274 274 return (error);
275 275 *off = noff;
276 276 return (error);
277 277 }
278 278
279 279 /* ARGSUSED */
280 280 static int
281 281 zfs_ioctl(vnode_t *vp, int com, intptr_t data, int flag, cred_t *cred,
282 282 int *rvalp, caller_context_t *ct)
283 283 {
284 284 offset_t off;
285 285 int error;
286 286 zfsvfs_t *zfsvfs;
287 287 znode_t *zp;
288 288
289 289 switch (com) {
290 290 case _FIOFFS:
291 291 return (zfs_sync(vp->v_vfsp, 0, cred));
292 292
293 293 /*
294 294 * The following two ioctls are used by bfu. Faking out,
295 295 * necessary to avoid bfu errors.
296 296 */
297 297 case _FIOGDIO:
298 298 case _FIOSDIO:
299 299 return (0);
300 300
301 301 case _FIO_SEEK_DATA:
302 302 case _FIO_SEEK_HOLE:
303 303 if (ddi_copyin((void *)data, &off, sizeof (off), flag))
304 304 return (SET_ERROR(EFAULT));
305 305
306 306 zp = VTOZ(vp);
307 307 zfsvfs = zp->z_zfsvfs;
308 308 ZFS_ENTER(zfsvfs);
309 309 ZFS_VERIFY_ZP(zp);
310 310
311 311 /* offset parameter is in/out */
312 312 error = zfs_holey(vp, com, &off);
313 313 ZFS_EXIT(zfsvfs);
314 314 if (error)
315 315 return (error);
316 316 if (ddi_copyout(&off, (void *)data, sizeof (off), flag))
317 317 return (SET_ERROR(EFAULT));
318 318 return (0);
319 319 }
320 320 return (SET_ERROR(ENOTTY));
321 321 }
322 322
323 323 /*
324 324 * Utility functions to map and unmap a single physical page. These
325 325 * are used to manage the mappable copies of ZFS file data, and therefore
326 326 * do not update ref/mod bits.
327 327 */
328 328 caddr_t
329 329 zfs_map_page(page_t *pp, enum seg_rw rw)
330 330 {
331 331 if (kpm_enable)
332 332 return (hat_kpm_mapin(pp, 0));
333 333 ASSERT(rw == S_READ || rw == S_WRITE);
334 334 return (ppmapin(pp, PROT_READ | ((rw == S_WRITE) ? PROT_WRITE : 0),
335 335 (caddr_t)-1));
336 336 }
337 337
338 338 void
339 339 zfs_unmap_page(page_t *pp, caddr_t addr)
340 340 {
341 341 if (kpm_enable) {
342 342 hat_kpm_mapout(pp, 0, addr);
343 343 } else {
344 344 ppmapout(addr);
345 345 }
346 346 }
347 347
348 348 /*
349 349 * When a file is memory mapped, we must keep the IO data synchronized
350 350 * between the DMU cache and the memory mapped pages. What this means:
351 351 *
352 352 * On Write: If we find a memory mapped page, we write to *both*
353 353 * the page and the dmu buffer.
354 354 */
355 355 static void
356 356 update_pages(vnode_t *vp, int64_t start, int len, objset_t *os, uint64_t oid)
357 357 {
358 358 int64_t off;
359 359
360 360 off = start & PAGEOFFSET;
361 361 for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
362 362 page_t *pp;
363 363 uint64_t nbytes = MIN(PAGESIZE - off, len);
364 364
365 365 if (pp = page_lookup(vp, start, SE_SHARED)) {
366 366 caddr_t va;
367 367
368 368 va = zfs_map_page(pp, S_WRITE);
369 369 (void) dmu_read(os, oid, start+off, nbytes, va+off,
370 370 DMU_READ_PREFETCH);
371 371 zfs_unmap_page(pp, va);
372 372 page_unlock(pp);
373 373 }
374 374 len -= nbytes;
375 375 off = 0;
376 376 }
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377 377 }
378 378
379 379 /*
380 380 * When a file is memory mapped, we must keep the IO data synchronized
381 381 * between the DMU cache and the memory mapped pages. What this means:
382 382 *
383 383 * On Read: We "read" preferentially from memory mapped pages,
384 384 * else we default from the dmu buffer.
385 385 *
386 386 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
387 - * the file is memory mapped.
387 + * the file is memory mapped.
388 388 */
389 389 static int
390 390 mappedread(vnode_t *vp, int nbytes, uio_t *uio)
391 391 {
392 392 znode_t *zp = VTOZ(vp);
393 393 objset_t *os = zp->z_zfsvfs->z_os;
394 394 int64_t start, off;
395 395 int len = nbytes;
396 396 int error = 0;
397 397
398 398 start = uio->uio_loffset;
399 399 off = start & PAGEOFFSET;
400 400 for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
401 401 page_t *pp;
402 402 uint64_t bytes = MIN(PAGESIZE - off, len);
403 403
404 404 if (pp = page_lookup(vp, start, SE_SHARED)) {
405 405 caddr_t va;
406 406
407 407 va = zfs_map_page(pp, S_READ);
408 408 error = uiomove(va + off, bytes, UIO_READ, uio);
409 409 zfs_unmap_page(pp, va);
410 410 page_unlock(pp);
411 411 } else {
412 412 error = dmu_read_uio(os, zp->z_id, uio, bytes);
413 413 }
414 414 len -= bytes;
415 415 off = 0;
416 416 if (error)
417 417 break;
418 418 }
419 419 return (error);
420 420 }
421 421
422 422 offset_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */
423 423
424 424 /*
425 425 * Read bytes from specified file into supplied buffer.
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426 426 *
427 427 * IN: vp - vnode of file to be read from.
428 428 * uio - structure supplying read location, range info,
429 429 * and return buffer.
430 430 * ioflag - SYNC flags; used to provide FRSYNC semantics.
431 431 * cr - credentials of caller.
432 432 * ct - caller context
433 433 *
434 434 * OUT: uio - updated offset and range, buffer filled.
435 435 *
436 - * RETURN: 0 if success
437 - * error code if failure
436 + * RETURN: 0 on success, error code on failure.
438 437 *
439 438 * Side Effects:
440 439 * vp - atime updated if byte count > 0
441 440 */
442 441 /* ARGSUSED */
443 442 static int
444 443 zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct)
445 444 {
446 445 znode_t *zp = VTOZ(vp);
447 446 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
448 447 objset_t *os;
449 448 ssize_t n, nbytes;
450 449 int error = 0;
451 450 rl_t *rl;
452 451 xuio_t *xuio = NULL;
453 452
454 453 ZFS_ENTER(zfsvfs);
455 454 ZFS_VERIFY_ZP(zp);
456 455 os = zfsvfs->z_os;
457 456
458 457 if (zp->z_pflags & ZFS_AV_QUARANTINED) {
459 458 ZFS_EXIT(zfsvfs);
460 459 return (SET_ERROR(EACCES));
461 460 }
462 461
463 462 /*
464 463 * Validate file offset
465 464 */
466 465 if (uio->uio_loffset < (offset_t)0) {
467 466 ZFS_EXIT(zfsvfs);
468 467 return (SET_ERROR(EINVAL));
469 468 }
470 469
471 470 /*
472 471 * Fasttrack empty reads
473 472 */
474 473 if (uio->uio_resid == 0) {
475 474 ZFS_EXIT(zfsvfs);
476 475 return (0);
477 476 }
478 477
479 478 /*
480 479 * Check for mandatory locks
481 480 */
482 481 if (MANDMODE(zp->z_mode)) {
483 482 if (error = chklock(vp, FREAD,
484 483 uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) {
485 484 ZFS_EXIT(zfsvfs);
486 485 return (error);
487 486 }
488 487 }
489 488
490 489 /*
491 490 * If we're in FRSYNC mode, sync out this znode before reading it.
492 491 */
493 492 if (ioflag & FRSYNC || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
494 493 zil_commit(zfsvfs->z_log, zp->z_id);
495 494
496 495 /*
497 496 * Lock the range against changes.
498 497 */
499 498 rl = zfs_range_lock(zp, uio->uio_loffset, uio->uio_resid, RL_READER);
500 499
501 500 /*
502 501 * If we are reading past end-of-file we can skip
503 502 * to the end; but we might still need to set atime.
504 503 */
505 504 if (uio->uio_loffset >= zp->z_size) {
506 505 error = 0;
507 506 goto out;
508 507 }
509 508
510 509 ASSERT(uio->uio_loffset < zp->z_size);
511 510 n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset);
512 511
513 512 if ((uio->uio_extflg == UIO_XUIO) &&
514 513 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) {
515 514 int nblk;
516 515 int blksz = zp->z_blksz;
517 516 uint64_t offset = uio->uio_loffset;
518 517
519 518 xuio = (xuio_t *)uio;
520 519 if ((ISP2(blksz))) {
521 520 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset,
522 521 blksz)) / blksz;
523 522 } else {
524 523 ASSERT(offset + n <= blksz);
525 524 nblk = 1;
526 525 }
527 526 (void) dmu_xuio_init(xuio, nblk);
528 527
529 528 if (vn_has_cached_data(vp)) {
530 529 /*
531 530 * For simplicity, we always allocate a full buffer
532 531 * even if we only expect to read a portion of a block.
533 532 */
534 533 while (--nblk >= 0) {
535 534 (void) dmu_xuio_add(xuio,
536 535 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
537 536 blksz), 0, blksz);
538 537 }
539 538 }
540 539 }
541 540
542 541 while (n > 0) {
543 542 nbytes = MIN(n, zfs_read_chunk_size -
544 543 P2PHASE(uio->uio_loffset, zfs_read_chunk_size));
545 544
546 545 if (vn_has_cached_data(vp))
547 546 error = mappedread(vp, nbytes, uio);
548 547 else
549 548 error = dmu_read_uio(os, zp->z_id, uio, nbytes);
550 549 if (error) {
551 550 /* convert checksum errors into IO errors */
552 551 if (error == ECKSUM)
553 552 error = SET_ERROR(EIO);
554 553 break;
555 554 }
556 555
557 556 n -= nbytes;
558 557 }
559 558 out:
560 559 zfs_range_unlock(rl);
561 560
562 561 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
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563 562 ZFS_EXIT(zfsvfs);
564 563 return (error);
565 564 }
566 565
567 566 /*
568 567 * Write the bytes to a file.
569 568 *
570 569 * IN: vp - vnode of file to be written to.
571 570 * uio - structure supplying write location, range info,
572 571 * and data buffer.
573 - * ioflag - FAPPEND flag set if in append mode.
572 + * ioflag - FAPPEND, FSYNC, and/or FDSYNC. FAPPEND is
573 + * set if in append mode.
574 574 * cr - credentials of caller.
575 575 * ct - caller context (NFS/CIFS fem monitor only)
576 576 *
577 577 * OUT: uio - updated offset and range.
578 578 *
579 - * RETURN: 0 if success
580 - * error code if failure
579 + * RETURN: 0 on success, error code on failure.
581 580 *
582 581 * Timestamps:
583 582 * vp - ctime|mtime updated if byte count > 0
584 583 */
585 584
586 585 /* ARGSUSED */
587 586 static int
588 587 zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct)
589 588 {
590 589 znode_t *zp = VTOZ(vp);
591 590 rlim64_t limit = uio->uio_llimit;
592 591 ssize_t start_resid = uio->uio_resid;
593 592 ssize_t tx_bytes;
594 593 uint64_t end_size;
595 594 dmu_tx_t *tx;
596 595 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
597 596 zilog_t *zilog;
598 597 offset_t woff;
599 598 ssize_t n, nbytes;
600 599 rl_t *rl;
601 600 int max_blksz = zfsvfs->z_max_blksz;
602 601 int error = 0;
603 602 arc_buf_t *abuf;
604 603 iovec_t *aiov = NULL;
605 604 xuio_t *xuio = NULL;
606 605 int i_iov = 0;
607 606 int iovcnt = uio->uio_iovcnt;
608 607 iovec_t *iovp = uio->uio_iov;
609 608 int write_eof;
610 609 int count = 0;
611 610 sa_bulk_attr_t bulk[4];
612 611 uint64_t mtime[2], ctime[2];
613 612
614 613 /*
615 614 * Fasttrack empty write
616 615 */
617 616 n = start_resid;
618 617 if (n == 0)
619 618 return (0);
620 619
621 620 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
622 621 limit = MAXOFFSET_T;
623 622
624 623 ZFS_ENTER(zfsvfs);
625 624 ZFS_VERIFY_ZP(zp);
626 625
627 626 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
628 627 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
629 628 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
630 629 &zp->z_size, 8);
631 630 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
632 631 &zp->z_pflags, 8);
633 632
634 633 /*
635 634 * If immutable or not appending then return EPERM
636 635 */
637 636 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
638 637 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) &&
639 638 (uio->uio_loffset < zp->z_size))) {
640 639 ZFS_EXIT(zfsvfs);
641 640 return (SET_ERROR(EPERM));
642 641 }
643 642
644 643 zilog = zfsvfs->z_log;
645 644
646 645 /*
647 646 * Validate file offset
648 647 */
649 648 woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset;
650 649 if (woff < 0) {
651 650 ZFS_EXIT(zfsvfs);
652 651 return (SET_ERROR(EINVAL));
653 652 }
654 653
655 654 /*
656 655 * Check for mandatory locks before calling zfs_range_lock()
657 656 * in order to prevent a deadlock with locks set via fcntl().
658 657 */
659 658 if (MANDMODE((mode_t)zp->z_mode) &&
660 659 (error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) {
661 660 ZFS_EXIT(zfsvfs);
662 661 return (error);
663 662 }
664 663
665 664 /*
666 665 * Pre-fault the pages to ensure slow (eg NFS) pages
667 666 * don't hold up txg.
668 667 * Skip this if uio contains loaned arc_buf.
669 668 */
670 669 if ((uio->uio_extflg == UIO_XUIO) &&
671 670 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY))
672 671 xuio = (xuio_t *)uio;
673 672 else
674 673 uio_prefaultpages(MIN(n, max_blksz), uio);
675 674
676 675 /*
677 676 * If in append mode, set the io offset pointer to eof.
678 677 */
679 678 if (ioflag & FAPPEND) {
680 679 /*
681 680 * Obtain an appending range lock to guarantee file append
682 681 * semantics. We reset the write offset once we have the lock.
683 682 */
684 683 rl = zfs_range_lock(zp, 0, n, RL_APPEND);
685 684 woff = rl->r_off;
686 685 if (rl->r_len == UINT64_MAX) {
687 686 /*
688 687 * We overlocked the file because this write will cause
689 688 * the file block size to increase.
690 689 * Note that zp_size cannot change with this lock held.
691 690 */
692 691 woff = zp->z_size;
693 692 }
694 693 uio->uio_loffset = woff;
695 694 } else {
696 695 /*
697 696 * Note that if the file block size will change as a result of
698 697 * this write, then this range lock will lock the entire file
699 698 * so that we can re-write the block safely.
700 699 */
701 700 rl = zfs_range_lock(zp, woff, n, RL_WRITER);
702 701 }
703 702
704 703 if (woff >= limit) {
705 704 zfs_range_unlock(rl);
706 705 ZFS_EXIT(zfsvfs);
707 706 return (SET_ERROR(EFBIG));
708 707 }
709 708
710 709 if ((woff + n) > limit || woff > (limit - n))
711 710 n = limit - woff;
712 711
713 712 /* Will this write extend the file length? */
714 713 write_eof = (woff + n > zp->z_size);
715 714
716 715 end_size = MAX(zp->z_size, woff + n);
717 716
718 717 /*
719 718 * Write the file in reasonable size chunks. Each chunk is written
720 719 * in a separate transaction; this keeps the intent log records small
721 720 * and allows us to do more fine-grained space accounting.
722 721 */
723 722 while (n > 0) {
724 723 abuf = NULL;
725 724 woff = uio->uio_loffset;
726 725 again:
727 726 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) ||
728 727 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) {
729 728 if (abuf != NULL)
730 729 dmu_return_arcbuf(abuf);
731 730 error = SET_ERROR(EDQUOT);
732 731 break;
733 732 }
734 733
735 734 if (xuio && abuf == NULL) {
736 735 ASSERT(i_iov < iovcnt);
737 736 aiov = &iovp[i_iov];
738 737 abuf = dmu_xuio_arcbuf(xuio, i_iov);
739 738 dmu_xuio_clear(xuio, i_iov);
740 739 DTRACE_PROBE3(zfs_cp_write, int, i_iov,
741 740 iovec_t *, aiov, arc_buf_t *, abuf);
742 741 ASSERT((aiov->iov_base == abuf->b_data) ||
743 742 ((char *)aiov->iov_base - (char *)abuf->b_data +
744 743 aiov->iov_len == arc_buf_size(abuf)));
745 744 i_iov++;
746 745 } else if (abuf == NULL && n >= max_blksz &&
747 746 woff >= zp->z_size &&
748 747 P2PHASE(woff, max_blksz) == 0 &&
749 748 zp->z_blksz == max_blksz) {
750 749 /*
751 750 * This write covers a full block. "Borrow" a buffer
752 751 * from the dmu so that we can fill it before we enter
753 752 * a transaction. This avoids the possibility of
754 753 * holding up the transaction if the data copy hangs
755 754 * up on a pagefault (e.g., from an NFS server mapping).
756 755 */
757 756 size_t cbytes;
758 757
759 758 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
760 759 max_blksz);
761 760 ASSERT(abuf != NULL);
762 761 ASSERT(arc_buf_size(abuf) == max_blksz);
763 762 if (error = uiocopy(abuf->b_data, max_blksz,
764 763 UIO_WRITE, uio, &cbytes)) {
765 764 dmu_return_arcbuf(abuf);
766 765 break;
767 766 }
768 767 ASSERT(cbytes == max_blksz);
769 768 }
770 769
771 770 /*
772 771 * Start a transaction.
773 772 */
774 773 tx = dmu_tx_create(zfsvfs->z_os);
775 774 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
776 775 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz));
777 776 zfs_sa_upgrade_txholds(tx, zp);
778 777 error = dmu_tx_assign(tx, TXG_NOWAIT);
779 778 if (error) {
780 779 if (error == ERESTART) {
781 780 dmu_tx_wait(tx);
782 781 dmu_tx_abort(tx);
783 782 goto again;
784 783 }
785 784 dmu_tx_abort(tx);
786 785 if (abuf != NULL)
787 786 dmu_return_arcbuf(abuf);
788 787 break;
789 788 }
790 789
791 790 /*
792 791 * If zfs_range_lock() over-locked we grow the blocksize
793 792 * and then reduce the lock range. This will only happen
794 793 * on the first iteration since zfs_range_reduce() will
795 794 * shrink down r_len to the appropriate size.
796 795 */
797 796 if (rl->r_len == UINT64_MAX) {
798 797 uint64_t new_blksz;
799 798
800 799 if (zp->z_blksz > max_blksz) {
801 800 ASSERT(!ISP2(zp->z_blksz));
802 801 new_blksz = MIN(end_size, SPA_MAXBLOCKSIZE);
803 802 } else {
804 803 new_blksz = MIN(end_size, max_blksz);
805 804 }
806 805 zfs_grow_blocksize(zp, new_blksz, tx);
807 806 zfs_range_reduce(rl, woff, n);
808 807 }
809 808
810 809 /*
811 810 * XXX - should we really limit each write to z_max_blksz?
812 811 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
813 812 */
814 813 nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz));
815 814
816 815 if (abuf == NULL) {
817 816 tx_bytes = uio->uio_resid;
818 817 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
819 818 uio, nbytes, tx);
820 819 tx_bytes -= uio->uio_resid;
821 820 } else {
822 821 tx_bytes = nbytes;
823 822 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len);
824 823 /*
825 824 * If this is not a full block write, but we are
826 825 * extending the file past EOF and this data starts
827 826 * block-aligned, use assign_arcbuf(). Otherwise,
828 827 * write via dmu_write().
829 828 */
830 829 if (tx_bytes < max_blksz && (!write_eof ||
831 830 aiov->iov_base != abuf->b_data)) {
832 831 ASSERT(xuio);
833 832 dmu_write(zfsvfs->z_os, zp->z_id, woff,
834 833 aiov->iov_len, aiov->iov_base, tx);
835 834 dmu_return_arcbuf(abuf);
836 835 xuio_stat_wbuf_copied();
837 836 } else {
838 837 ASSERT(xuio || tx_bytes == max_blksz);
839 838 dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl),
840 839 woff, abuf, tx);
841 840 }
842 841 ASSERT(tx_bytes <= uio->uio_resid);
843 842 uioskip(uio, tx_bytes);
844 843 }
845 844 if (tx_bytes && vn_has_cached_data(vp)) {
846 845 update_pages(vp, woff,
847 846 tx_bytes, zfsvfs->z_os, zp->z_id);
848 847 }
849 848
850 849 /*
851 850 * If we made no progress, we're done. If we made even
852 851 * partial progress, update the znode and ZIL accordingly.
853 852 */
854 853 if (tx_bytes == 0) {
855 854 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
856 855 (void *)&zp->z_size, sizeof (uint64_t), tx);
857 856 dmu_tx_commit(tx);
858 857 ASSERT(error != 0);
859 858 break;
860 859 }
861 860
862 861 /*
863 862 * Clear Set-UID/Set-GID bits on successful write if not
864 863 * privileged and at least one of the excute bits is set.
865 864 *
866 865 * It would be nice to to this after all writes have
867 866 * been done, but that would still expose the ISUID/ISGID
868 867 * to another app after the partial write is committed.
869 868 *
870 869 * Note: we don't call zfs_fuid_map_id() here because
871 870 * user 0 is not an ephemeral uid.
872 871 */
873 872 mutex_enter(&zp->z_acl_lock);
874 873 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) |
875 874 (S_IXUSR >> 6))) != 0 &&
876 875 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 &&
877 876 secpolicy_vnode_setid_retain(cr,
878 877 (zp->z_mode & S_ISUID) != 0 && zp->z_uid == 0) != 0) {
879 878 uint64_t newmode;
880 879 zp->z_mode &= ~(S_ISUID | S_ISGID);
881 880 newmode = zp->z_mode;
882 881 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs),
883 882 (void *)&newmode, sizeof (uint64_t), tx);
884 883 }
885 884 mutex_exit(&zp->z_acl_lock);
886 885
887 886 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
888 887 B_TRUE);
889 888
890 889 /*
891 890 * Update the file size (zp_size) if it has changed;
892 891 * account for possible concurrent updates.
893 892 */
894 893 while ((end_size = zp->z_size) < uio->uio_loffset) {
895 894 (void) atomic_cas_64(&zp->z_size, end_size,
896 895 uio->uio_loffset);
897 896 ASSERT(error == 0);
898 897 }
899 898 /*
900 899 * If we are replaying and eof is non zero then force
901 900 * the file size to the specified eof. Note, there's no
902 901 * concurrency during replay.
903 902 */
904 903 if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
905 904 zp->z_size = zfsvfs->z_replay_eof;
906 905
907 906 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
908 907
909 908 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag);
910 909 dmu_tx_commit(tx);
911 910
912 911 if (error != 0)
913 912 break;
914 913 ASSERT(tx_bytes == nbytes);
915 914 n -= nbytes;
916 915
917 916 if (!xuio && n > 0)
918 917 uio_prefaultpages(MIN(n, max_blksz), uio);
919 918 }
920 919
921 920 zfs_range_unlock(rl);
922 921
923 922 /*
924 923 * If we're in replay mode, or we made no progress, return error.
925 924 * Otherwise, it's at least a partial write, so it's successful.
926 925 */
927 926 if (zfsvfs->z_replay || uio->uio_resid == start_resid) {
928 927 ZFS_EXIT(zfsvfs);
929 928 return (error);
930 929 }
931 930
932 931 if (ioflag & (FSYNC | FDSYNC) ||
933 932 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
934 933 zil_commit(zilog, zp->z_id);
935 934
936 935 ZFS_EXIT(zfsvfs);
937 936 return (0);
938 937 }
939 938
940 939 void
941 940 zfs_get_done(zgd_t *zgd, int error)
942 941 {
943 942 znode_t *zp = zgd->zgd_private;
944 943 objset_t *os = zp->z_zfsvfs->z_os;
945 944
946 945 if (zgd->zgd_db)
947 946 dmu_buf_rele(zgd->zgd_db, zgd);
948 947
949 948 zfs_range_unlock(zgd->zgd_rl);
950 949
951 950 /*
952 951 * Release the vnode asynchronously as we currently have the
953 952 * txg stopped from syncing.
954 953 */
955 954 VN_RELE_ASYNC(ZTOV(zp), dsl_pool_vnrele_taskq(dmu_objset_pool(os)));
956 955
957 956 if (error == 0 && zgd->zgd_bp)
958 957 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
959 958
960 959 kmem_free(zgd, sizeof (zgd_t));
961 960 }
962 961
963 962 #ifdef DEBUG
964 963 static int zil_fault_io = 0;
965 964 #endif
966 965
967 966 /*
968 967 * Get data to generate a TX_WRITE intent log record.
969 968 */
970 969 int
971 970 zfs_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
972 971 {
973 972 zfsvfs_t *zfsvfs = arg;
974 973 objset_t *os = zfsvfs->z_os;
975 974 znode_t *zp;
976 975 uint64_t object = lr->lr_foid;
977 976 uint64_t offset = lr->lr_offset;
978 977 uint64_t size = lr->lr_length;
979 978 blkptr_t *bp = &lr->lr_blkptr;
980 979 dmu_buf_t *db;
981 980 zgd_t *zgd;
982 981 int error = 0;
983 982
984 983 ASSERT(zio != NULL);
985 984 ASSERT(size != 0);
986 985
987 986 /*
988 987 * Nothing to do if the file has been removed
989 988 */
990 989 if (zfs_zget(zfsvfs, object, &zp) != 0)
991 990 return (SET_ERROR(ENOENT));
992 991 if (zp->z_unlinked) {
993 992 /*
994 993 * Release the vnode asynchronously as we currently have the
995 994 * txg stopped from syncing.
996 995 */
997 996 VN_RELE_ASYNC(ZTOV(zp),
998 997 dsl_pool_vnrele_taskq(dmu_objset_pool(os)));
999 998 return (SET_ERROR(ENOENT));
1000 999 }
1001 1000
1002 1001 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1003 1002 zgd->zgd_zilog = zfsvfs->z_log;
1004 1003 zgd->zgd_private = zp;
1005 1004
1006 1005 /*
1007 1006 * Write records come in two flavors: immediate and indirect.
1008 1007 * For small writes it's cheaper to store the data with the
1009 1008 * log record (immediate); for large writes it's cheaper to
1010 1009 * sync the data and get a pointer to it (indirect) so that
1011 1010 * we don't have to write the data twice.
1012 1011 */
1013 1012 if (buf != NULL) { /* immediate write */
1014 1013 zgd->zgd_rl = zfs_range_lock(zp, offset, size, RL_READER);
1015 1014 /* test for truncation needs to be done while range locked */
1016 1015 if (offset >= zp->z_size) {
1017 1016 error = SET_ERROR(ENOENT);
1018 1017 } else {
1019 1018 error = dmu_read(os, object, offset, size, buf,
1020 1019 DMU_READ_NO_PREFETCH);
1021 1020 }
1022 1021 ASSERT(error == 0 || error == ENOENT);
1023 1022 } else { /* indirect write */
1024 1023 /*
1025 1024 * Have to lock the whole block to ensure when it's
1026 1025 * written out and it's checksum is being calculated
1027 1026 * that no one can change the data. We need to re-check
1028 1027 * blocksize after we get the lock in case it's changed!
1029 1028 */
1030 1029 for (;;) {
1031 1030 uint64_t blkoff;
1032 1031 size = zp->z_blksz;
1033 1032 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset;
1034 1033 offset -= blkoff;
1035 1034 zgd->zgd_rl = zfs_range_lock(zp, offset, size,
1036 1035 RL_READER);
1037 1036 if (zp->z_blksz == size)
1038 1037 break;
1039 1038 offset += blkoff;
1040 1039 zfs_range_unlock(zgd->zgd_rl);
1041 1040 }
1042 1041 /* test for truncation needs to be done while range locked */
1043 1042 if (lr->lr_offset >= zp->z_size)
1044 1043 error = SET_ERROR(ENOENT);
1045 1044 #ifdef DEBUG
1046 1045 if (zil_fault_io) {
1047 1046 error = SET_ERROR(EIO);
1048 1047 zil_fault_io = 0;
1049 1048 }
1050 1049 #endif
1051 1050 if (error == 0)
1052 1051 error = dmu_buf_hold(os, object, offset, zgd, &db,
1053 1052 DMU_READ_NO_PREFETCH);
1054 1053
1055 1054 if (error == 0) {
1056 1055 blkptr_t *obp = dmu_buf_get_blkptr(db);
1057 1056 if (obp) {
1058 1057 ASSERT(BP_IS_HOLE(bp));
1059 1058 *bp = *obp;
1060 1059 }
1061 1060
1062 1061 zgd->zgd_db = db;
1063 1062 zgd->zgd_bp = bp;
1064 1063
1065 1064 ASSERT(db->db_offset == offset);
1066 1065 ASSERT(db->db_size == size);
1067 1066
1068 1067 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1069 1068 zfs_get_done, zgd);
1070 1069 ASSERT(error || lr->lr_length <= zp->z_blksz);
1071 1070
1072 1071 /*
1073 1072 * On success, we need to wait for the write I/O
1074 1073 * initiated by dmu_sync() to complete before we can
1075 1074 * release this dbuf. We will finish everything up
1076 1075 * in the zfs_get_done() callback.
1077 1076 */
1078 1077 if (error == 0)
1079 1078 return (0);
1080 1079
1081 1080 if (error == EALREADY) {
1082 1081 lr->lr_common.lrc_txtype = TX_WRITE2;
1083 1082 error = 0;
1084 1083 }
1085 1084 }
1086 1085 }
1087 1086
1088 1087 zfs_get_done(zgd, error);
1089 1088
1090 1089 return (error);
1091 1090 }
1092 1091
1093 1092 /*ARGSUSED*/
1094 1093 static int
1095 1094 zfs_access(vnode_t *vp, int mode, int flag, cred_t *cr,
1096 1095 caller_context_t *ct)
1097 1096 {
1098 1097 znode_t *zp = VTOZ(vp);
1099 1098 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1100 1099 int error;
1101 1100
1102 1101 ZFS_ENTER(zfsvfs);
1103 1102 ZFS_VERIFY_ZP(zp);
1104 1103
1105 1104 if (flag & V_ACE_MASK)
1106 1105 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
1107 1106 else
1108 1107 error = zfs_zaccess_rwx(zp, mode, flag, cr);
1109 1108
1110 1109 ZFS_EXIT(zfsvfs);
1111 1110 return (error);
1112 1111 }
1113 1112
1114 1113 /*
1115 1114 * If vnode is for a device return a specfs vnode instead.
1116 1115 */
1117 1116 static int
1118 1117 specvp_check(vnode_t **vpp, cred_t *cr)
1119 1118 {
1120 1119 int error = 0;
1121 1120
1122 1121 if (IS_DEVVP(*vpp)) {
1123 1122 struct vnode *svp;
1124 1123
1125 1124 svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr);
1126 1125 VN_RELE(*vpp);
1127 1126 if (svp == NULL)
1128 1127 error = SET_ERROR(ENOSYS);
1129 1128 *vpp = svp;
1130 1129 }
1131 1130 return (error);
1132 1131 }
1133 1132
1134 1133
1135 1134 /*
1136 1135 * Lookup an entry in a directory, or an extended attribute directory.
1137 1136 * If it exists, return a held vnode reference for it.
1138 1137 *
1139 1138 * IN: dvp - vnode of directory to search.
1140 1139 * nm - name of entry to lookup.
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1141 1140 * pnp - full pathname to lookup [UNUSED].
1142 1141 * flags - LOOKUP_XATTR set if looking for an attribute.
1143 1142 * rdir - root directory vnode [UNUSED].
1144 1143 * cr - credentials of caller.
1145 1144 * ct - caller context
1146 1145 * direntflags - directory lookup flags
1147 1146 * realpnp - returned pathname.
1148 1147 *
1149 1148 * OUT: vpp - vnode of located entry, NULL if not found.
1150 1149 *
1151 - * RETURN: 0 if success
1152 - * error code if failure
1150 + * RETURN: 0 on success, error code on failure.
1153 1151 *
1154 1152 * Timestamps:
1155 1153 * NA
1156 1154 */
1157 1155 /* ARGSUSED */
1158 1156 static int
1159 1157 zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp,
1160 1158 int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
1161 1159 int *direntflags, pathname_t *realpnp)
1162 1160 {
1163 1161 znode_t *zdp = VTOZ(dvp);
1164 1162 zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
1165 1163 int error = 0;
1166 1164
1167 1165 /* fast path */
1168 1166 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
1169 1167
1170 1168 if (dvp->v_type != VDIR) {
1171 1169 return (SET_ERROR(ENOTDIR));
1172 1170 } else if (zdp->z_sa_hdl == NULL) {
1173 1171 return (SET_ERROR(EIO));
1174 1172 }
1175 1173
1176 1174 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
1177 1175 error = zfs_fastaccesschk_execute(zdp, cr);
1178 1176 if (!error) {
1179 1177 *vpp = dvp;
1180 1178 VN_HOLD(*vpp);
1181 1179 return (0);
1182 1180 }
1183 1181 return (error);
1184 1182 } else {
1185 1183 vnode_t *tvp = dnlc_lookup(dvp, nm);
1186 1184
1187 1185 if (tvp) {
1188 1186 error = zfs_fastaccesschk_execute(zdp, cr);
1189 1187 if (error) {
1190 1188 VN_RELE(tvp);
1191 1189 return (error);
1192 1190 }
1193 1191 if (tvp == DNLC_NO_VNODE) {
1194 1192 VN_RELE(tvp);
1195 1193 return (SET_ERROR(ENOENT));
1196 1194 } else {
1197 1195 *vpp = tvp;
1198 1196 return (specvp_check(vpp, cr));
1199 1197 }
1200 1198 }
1201 1199 }
1202 1200 }
1203 1201
1204 1202 DTRACE_PROBE2(zfs__fastpath__lookup__miss, vnode_t *, dvp, char *, nm);
1205 1203
1206 1204 ZFS_ENTER(zfsvfs);
1207 1205 ZFS_VERIFY_ZP(zdp);
1208 1206
1209 1207 *vpp = NULL;
1210 1208
1211 1209 if (flags & LOOKUP_XATTR) {
1212 1210 /*
1213 1211 * If the xattr property is off, refuse the lookup request.
1214 1212 */
1215 1213 if (!(zfsvfs->z_vfs->vfs_flag & VFS_XATTR)) {
1216 1214 ZFS_EXIT(zfsvfs);
1217 1215 return (SET_ERROR(EINVAL));
1218 1216 }
1219 1217
1220 1218 /*
1221 1219 * We don't allow recursive attributes..
1222 1220 * Maybe someday we will.
1223 1221 */
1224 1222 if (zdp->z_pflags & ZFS_XATTR) {
1225 1223 ZFS_EXIT(zfsvfs);
1226 1224 return (SET_ERROR(EINVAL));
1227 1225 }
1228 1226
1229 1227 if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr, flags)) {
1230 1228 ZFS_EXIT(zfsvfs);
1231 1229 return (error);
1232 1230 }
1233 1231
1234 1232 /*
1235 1233 * Do we have permission to get into attribute directory?
1236 1234 */
1237 1235
1238 1236 if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, 0,
1239 1237 B_FALSE, cr)) {
1240 1238 VN_RELE(*vpp);
1241 1239 *vpp = NULL;
1242 1240 }
1243 1241
1244 1242 ZFS_EXIT(zfsvfs);
1245 1243 return (error);
1246 1244 }
1247 1245
1248 1246 if (dvp->v_type != VDIR) {
1249 1247 ZFS_EXIT(zfsvfs);
1250 1248 return (SET_ERROR(ENOTDIR));
1251 1249 }
1252 1250
1253 1251 /*
1254 1252 * Check accessibility of directory.
1255 1253 */
1256 1254
1257 1255 if (error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr)) {
1258 1256 ZFS_EXIT(zfsvfs);
1259 1257 return (error);
1260 1258 }
1261 1259
1262 1260 if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
1263 1261 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1264 1262 ZFS_EXIT(zfsvfs);
1265 1263 return (SET_ERROR(EILSEQ));
1266 1264 }
1267 1265
1268 1266 error = zfs_dirlook(zdp, nm, vpp, flags, direntflags, realpnp);
1269 1267 if (error == 0)
1270 1268 error = specvp_check(vpp, cr);
1271 1269
1272 1270 ZFS_EXIT(zfsvfs);
1273 1271 return (error);
1274 1272 }
1275 1273
1276 1274 /*
1277 1275 * Attempt to create a new entry in a directory. If the entry
1278 1276 * already exists, truncate the file if permissible, else return
1279 1277 * an error. Return the vp of the created or trunc'd file.
1280 1278 *
1281 1279 * IN: dvp - vnode of directory to put new file entry in.
1282 1280 * name - name of new file entry.
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1283 1281 * vap - attributes of new file.
1284 1282 * excl - flag indicating exclusive or non-exclusive mode.
1285 1283 * mode - mode to open file with.
1286 1284 * cr - credentials of caller.
1287 1285 * flag - large file flag [UNUSED].
1288 1286 * ct - caller context
1289 1287 * vsecp - ACL to be set
1290 1288 *
1291 1289 * OUT: vpp - vnode of created or trunc'd entry.
1292 1290 *
1293 - * RETURN: 0 if success
1294 - * error code if failure
1291 + * RETURN: 0 on success, error code on failure.
1295 1292 *
1296 1293 * Timestamps:
1297 1294 * dvp - ctime|mtime updated if new entry created
1298 1295 * vp - ctime|mtime always, atime if new
1299 1296 */
1300 1297
1301 1298 /* ARGSUSED */
1302 1299 static int
1303 1300 zfs_create(vnode_t *dvp, char *name, vattr_t *vap, vcexcl_t excl,
1304 1301 int mode, vnode_t **vpp, cred_t *cr, int flag, caller_context_t *ct,
1305 1302 vsecattr_t *vsecp)
1306 1303 {
1307 1304 znode_t *zp, *dzp = VTOZ(dvp);
1308 1305 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1309 1306 zilog_t *zilog;
1310 1307 objset_t *os;
1311 1308 zfs_dirlock_t *dl;
1312 1309 dmu_tx_t *tx;
1313 1310 int error;
1314 1311 ksid_t *ksid;
1315 1312 uid_t uid;
1316 1313 gid_t gid = crgetgid(cr);
1317 1314 zfs_acl_ids_t acl_ids;
1318 1315 boolean_t fuid_dirtied;
1319 1316 boolean_t have_acl = B_FALSE;
1320 1317
1321 1318 /*
1322 1319 * If we have an ephemeral id, ACL, or XVATTR then
1323 1320 * make sure file system is at proper version
1324 1321 */
1325 1322
1326 1323 ksid = crgetsid(cr, KSID_OWNER);
1327 1324 if (ksid)
1328 1325 uid = ksid_getid(ksid);
1329 1326 else
1330 1327 uid = crgetuid(cr);
1331 1328
1332 1329 if (zfsvfs->z_use_fuids == B_FALSE &&
1333 1330 (vsecp || (vap->va_mask & AT_XVATTR) ||
1334 1331 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1335 1332 return (SET_ERROR(EINVAL));
1336 1333
1337 1334 ZFS_ENTER(zfsvfs);
1338 1335 ZFS_VERIFY_ZP(dzp);
1339 1336 os = zfsvfs->z_os;
1340 1337 zilog = zfsvfs->z_log;
1341 1338
1342 1339 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
1343 1340 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1344 1341 ZFS_EXIT(zfsvfs);
1345 1342 return (SET_ERROR(EILSEQ));
1346 1343 }
1347 1344
1348 1345 if (vap->va_mask & AT_XVATTR) {
1349 1346 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1350 1347 crgetuid(cr), cr, vap->va_type)) != 0) {
1351 1348 ZFS_EXIT(zfsvfs);
1352 1349 return (error);
1353 1350 }
1354 1351 }
1355 1352 top:
1356 1353 *vpp = NULL;
1357 1354
1358 1355 if ((vap->va_mode & VSVTX) && secpolicy_vnode_stky_modify(cr))
1359 1356 vap->va_mode &= ~VSVTX;
1360 1357
1361 1358 if (*name == '\0') {
1362 1359 /*
1363 1360 * Null component name refers to the directory itself.
1364 1361 */
1365 1362 VN_HOLD(dvp);
1366 1363 zp = dzp;
1367 1364 dl = NULL;
1368 1365 error = 0;
1369 1366 } else {
1370 1367 /* possible VN_HOLD(zp) */
1371 1368 int zflg = 0;
1372 1369
1373 1370 if (flag & FIGNORECASE)
1374 1371 zflg |= ZCILOOK;
1375 1372
1376 1373 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1377 1374 NULL, NULL);
1378 1375 if (error) {
1379 1376 if (have_acl)
1380 1377 zfs_acl_ids_free(&acl_ids);
1381 1378 if (strcmp(name, "..") == 0)
1382 1379 error = SET_ERROR(EISDIR);
1383 1380 ZFS_EXIT(zfsvfs);
1384 1381 return (error);
1385 1382 }
1386 1383 }
1387 1384
1388 1385 if (zp == NULL) {
1389 1386 uint64_t txtype;
1390 1387
1391 1388 /*
1392 1389 * Create a new file object and update the directory
1393 1390 * to reference it.
1394 1391 */
1395 1392 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) {
1396 1393 if (have_acl)
1397 1394 zfs_acl_ids_free(&acl_ids);
1398 1395 goto out;
1399 1396 }
1400 1397
1401 1398 /*
1402 1399 * We only support the creation of regular files in
1403 1400 * extended attribute directories.
1404 1401 */
1405 1402
1406 1403 if ((dzp->z_pflags & ZFS_XATTR) &&
1407 1404 (vap->va_type != VREG)) {
1408 1405 if (have_acl)
1409 1406 zfs_acl_ids_free(&acl_ids);
1410 1407 error = SET_ERROR(EINVAL);
1411 1408 goto out;
1412 1409 }
1413 1410
1414 1411 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1415 1412 cr, vsecp, &acl_ids)) != 0)
1416 1413 goto out;
1417 1414 have_acl = B_TRUE;
1418 1415
1419 1416 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
1420 1417 zfs_acl_ids_free(&acl_ids);
1421 1418 error = SET_ERROR(EDQUOT);
1422 1419 goto out;
1423 1420 }
1424 1421
1425 1422 tx = dmu_tx_create(os);
1426 1423
1427 1424 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1428 1425 ZFS_SA_BASE_ATTR_SIZE);
1429 1426
1430 1427 fuid_dirtied = zfsvfs->z_fuid_dirty;
1431 1428 if (fuid_dirtied)
1432 1429 zfs_fuid_txhold(zfsvfs, tx);
1433 1430 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
1434 1431 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
1435 1432 if (!zfsvfs->z_use_sa &&
1436 1433 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1437 1434 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1438 1435 0, acl_ids.z_aclp->z_acl_bytes);
1439 1436 }
1440 1437 error = dmu_tx_assign(tx, TXG_NOWAIT);
1441 1438 if (error) {
1442 1439 zfs_dirent_unlock(dl);
1443 1440 if (error == ERESTART) {
1444 1441 dmu_tx_wait(tx);
1445 1442 dmu_tx_abort(tx);
1446 1443 goto top;
1447 1444 }
1448 1445 zfs_acl_ids_free(&acl_ids);
1449 1446 dmu_tx_abort(tx);
1450 1447 ZFS_EXIT(zfsvfs);
1451 1448 return (error);
1452 1449 }
1453 1450 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1454 1451
1455 1452 if (fuid_dirtied)
1456 1453 zfs_fuid_sync(zfsvfs, tx);
1457 1454
1458 1455 (void) zfs_link_create(dl, zp, tx, ZNEW);
1459 1456 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
1460 1457 if (flag & FIGNORECASE)
1461 1458 txtype |= TX_CI;
1462 1459 zfs_log_create(zilog, tx, txtype, dzp, zp, name,
1463 1460 vsecp, acl_ids.z_fuidp, vap);
1464 1461 zfs_acl_ids_free(&acl_ids);
1465 1462 dmu_tx_commit(tx);
1466 1463 } else {
1467 1464 int aflags = (flag & FAPPEND) ? V_APPEND : 0;
1468 1465
1469 1466 if (have_acl)
1470 1467 zfs_acl_ids_free(&acl_ids);
1471 1468 have_acl = B_FALSE;
1472 1469
1473 1470 /*
1474 1471 * A directory entry already exists for this name.
1475 1472 */
1476 1473 /*
1477 1474 * Can't truncate an existing file if in exclusive mode.
1478 1475 */
1479 1476 if (excl == EXCL) {
1480 1477 error = SET_ERROR(EEXIST);
1481 1478 goto out;
1482 1479 }
1483 1480 /*
1484 1481 * Can't open a directory for writing.
1485 1482 */
1486 1483 if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) {
1487 1484 error = SET_ERROR(EISDIR);
1488 1485 goto out;
1489 1486 }
1490 1487 /*
1491 1488 * Verify requested access to file.
1492 1489 */
1493 1490 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
1494 1491 goto out;
1495 1492 }
1496 1493
1497 1494 mutex_enter(&dzp->z_lock);
1498 1495 dzp->z_seq++;
1499 1496 mutex_exit(&dzp->z_lock);
1500 1497
1501 1498 /*
1502 1499 * Truncate regular files if requested.
1503 1500 */
1504 1501 if ((ZTOV(zp)->v_type == VREG) &&
1505 1502 (vap->va_mask & AT_SIZE) && (vap->va_size == 0)) {
1506 1503 /* we can't hold any locks when calling zfs_freesp() */
1507 1504 zfs_dirent_unlock(dl);
1508 1505 dl = NULL;
1509 1506 error = zfs_freesp(zp, 0, 0, mode, TRUE);
1510 1507 if (error == 0) {
1511 1508 vnevent_create(ZTOV(zp), ct);
1512 1509 }
1513 1510 }
1514 1511 }
1515 1512 out:
1516 1513
1517 1514 if (dl)
1518 1515 zfs_dirent_unlock(dl);
1519 1516
1520 1517 if (error) {
1521 1518 if (zp)
1522 1519 VN_RELE(ZTOV(zp));
1523 1520 } else {
1524 1521 *vpp = ZTOV(zp);
1525 1522 error = specvp_check(vpp, cr);
1526 1523 }
1527 1524
1528 1525 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1529 1526 zil_commit(zilog, 0);
1530 1527
1531 1528 ZFS_EXIT(zfsvfs);
1532 1529 return (error);
1533 1530 }
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1534 1531
1535 1532 /*
1536 1533 * Remove an entry from a directory.
1537 1534 *
1538 1535 * IN: dvp - vnode of directory to remove entry from.
1539 1536 * name - name of entry to remove.
1540 1537 * cr - credentials of caller.
1541 1538 * ct - caller context
1542 1539 * flags - case flags
1543 1540 *
1544 - * RETURN: 0 if success
1545 - * error code if failure
1541 + * RETURN: 0 on success, error code on failure.
1546 1542 *
1547 1543 * Timestamps:
1548 1544 * dvp - ctime|mtime
1549 1545 * vp - ctime (if nlink > 0)
1550 1546 */
1551 1547
1552 1548 uint64_t null_xattr = 0;
1553 1549
1554 1550 /*ARGSUSED*/
1555 1551 static int
1556 1552 zfs_remove(vnode_t *dvp, char *name, cred_t *cr, caller_context_t *ct,
1557 1553 int flags)
1558 1554 {
1559 1555 znode_t *zp, *dzp = VTOZ(dvp);
1560 1556 znode_t *xzp;
1561 1557 vnode_t *vp;
1562 1558 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1563 1559 zilog_t *zilog;
1564 1560 uint64_t acl_obj, xattr_obj;
1565 1561 uint64_t xattr_obj_unlinked = 0;
1566 1562 uint64_t obj = 0;
1567 1563 zfs_dirlock_t *dl;
1568 1564 dmu_tx_t *tx;
1569 1565 boolean_t may_delete_now, delete_now = FALSE;
1570 1566 boolean_t unlinked, toobig = FALSE;
1571 1567 uint64_t txtype;
1572 1568 pathname_t *realnmp = NULL;
1573 1569 pathname_t realnm;
1574 1570 int error;
1575 1571 int zflg = ZEXISTS;
1576 1572
1577 1573 ZFS_ENTER(zfsvfs);
1578 1574 ZFS_VERIFY_ZP(dzp);
1579 1575 zilog = zfsvfs->z_log;
1580 1576
1581 1577 if (flags & FIGNORECASE) {
1582 1578 zflg |= ZCILOOK;
1583 1579 pn_alloc(&realnm);
1584 1580 realnmp = &realnm;
1585 1581 }
1586 1582
1587 1583 top:
1588 1584 xattr_obj = 0;
1589 1585 xzp = NULL;
1590 1586 /*
1591 1587 * Attempt to lock directory; fail if entry doesn't exist.
1592 1588 */
1593 1589 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1594 1590 NULL, realnmp)) {
1595 1591 if (realnmp)
1596 1592 pn_free(realnmp);
1597 1593 ZFS_EXIT(zfsvfs);
1598 1594 return (error);
1599 1595 }
1600 1596
1601 1597 vp = ZTOV(zp);
1602 1598
1603 1599 if (error = zfs_zaccess_delete(dzp, zp, cr)) {
1604 1600 goto out;
1605 1601 }
1606 1602
1607 1603 /*
1608 1604 * Need to use rmdir for removing directories.
1609 1605 */
1610 1606 if (vp->v_type == VDIR) {
1611 1607 error = SET_ERROR(EPERM);
1612 1608 goto out;
1613 1609 }
1614 1610
1615 1611 vnevent_remove(vp, dvp, name, ct);
1616 1612
1617 1613 if (realnmp)
1618 1614 dnlc_remove(dvp, realnmp->pn_buf);
1619 1615 else
1620 1616 dnlc_remove(dvp, name);
1621 1617
1622 1618 mutex_enter(&vp->v_lock);
1623 1619 may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp);
1624 1620 mutex_exit(&vp->v_lock);
1625 1621
1626 1622 /*
1627 1623 * We may delete the znode now, or we may put it in the unlinked set;
1628 1624 * it depends on whether we're the last link, and on whether there are
1629 1625 * other holds on the vnode. So we dmu_tx_hold() the right things to
1630 1626 * allow for either case.
1631 1627 */
1632 1628 obj = zp->z_id;
1633 1629 tx = dmu_tx_create(zfsvfs->z_os);
1634 1630 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
1635 1631 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1636 1632 zfs_sa_upgrade_txholds(tx, zp);
1637 1633 zfs_sa_upgrade_txholds(tx, dzp);
1638 1634 if (may_delete_now) {
1639 1635 toobig =
1640 1636 zp->z_size > zp->z_blksz * DMU_MAX_DELETEBLKCNT;
1641 1637 /* if the file is too big, only hold_free a token amount */
1642 1638 dmu_tx_hold_free(tx, zp->z_id, 0,
1643 1639 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
1644 1640 }
1645 1641
1646 1642 /* are there any extended attributes? */
1647 1643 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1648 1644 &xattr_obj, sizeof (xattr_obj));
1649 1645 if (error == 0 && xattr_obj) {
1650 1646 error = zfs_zget(zfsvfs, xattr_obj, &xzp);
1651 1647 ASSERT0(error);
1652 1648 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1653 1649 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
1654 1650 }
1655 1651
1656 1652 mutex_enter(&zp->z_lock);
1657 1653 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
1658 1654 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
1659 1655 mutex_exit(&zp->z_lock);
1660 1656
1661 1657 /* charge as an update -- would be nice not to charge at all */
1662 1658 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
1663 1659
1664 1660 error = dmu_tx_assign(tx, TXG_NOWAIT);
1665 1661 if (error) {
1666 1662 zfs_dirent_unlock(dl);
1667 1663 VN_RELE(vp);
1668 1664 if (xzp)
1669 1665 VN_RELE(ZTOV(xzp));
1670 1666 if (error == ERESTART) {
1671 1667 dmu_tx_wait(tx);
1672 1668 dmu_tx_abort(tx);
1673 1669 goto top;
1674 1670 }
1675 1671 if (realnmp)
1676 1672 pn_free(realnmp);
1677 1673 dmu_tx_abort(tx);
1678 1674 ZFS_EXIT(zfsvfs);
1679 1675 return (error);
1680 1676 }
1681 1677
1682 1678 /*
1683 1679 * Remove the directory entry.
1684 1680 */
1685 1681 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
1686 1682
1687 1683 if (error) {
1688 1684 dmu_tx_commit(tx);
1689 1685 goto out;
1690 1686 }
1691 1687
1692 1688 if (unlinked) {
1693 1689
1694 1690 /*
1695 1691 * Hold z_lock so that we can make sure that the ACL obj
1696 1692 * hasn't changed. Could have been deleted due to
1697 1693 * zfs_sa_upgrade().
1698 1694 */
1699 1695 mutex_enter(&zp->z_lock);
1700 1696 mutex_enter(&vp->v_lock);
1701 1697 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1702 1698 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
1703 1699 delete_now = may_delete_now && !toobig &&
1704 1700 vp->v_count == 1 && !vn_has_cached_data(vp) &&
1705 1701 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) ==
1706 1702 acl_obj;
1707 1703 mutex_exit(&vp->v_lock);
1708 1704 }
1709 1705
1710 1706 if (delete_now) {
1711 1707 if (xattr_obj_unlinked) {
1712 1708 ASSERT3U(xzp->z_links, ==, 2);
1713 1709 mutex_enter(&xzp->z_lock);
1714 1710 xzp->z_unlinked = 1;
1715 1711 xzp->z_links = 0;
1716 1712 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
1717 1713 &xzp->z_links, sizeof (xzp->z_links), tx);
1718 1714 ASSERT3U(error, ==, 0);
1719 1715 mutex_exit(&xzp->z_lock);
1720 1716 zfs_unlinked_add(xzp, tx);
1721 1717
1722 1718 if (zp->z_is_sa)
1723 1719 error = sa_remove(zp->z_sa_hdl,
1724 1720 SA_ZPL_XATTR(zfsvfs), tx);
1725 1721 else
1726 1722 error = sa_update(zp->z_sa_hdl,
1727 1723 SA_ZPL_XATTR(zfsvfs), &null_xattr,
1728 1724 sizeof (uint64_t), tx);
1729 1725 ASSERT0(error);
1730 1726 }
1731 1727 mutex_enter(&vp->v_lock);
1732 1728 vp->v_count--;
1733 1729 ASSERT0(vp->v_count);
1734 1730 mutex_exit(&vp->v_lock);
1735 1731 mutex_exit(&zp->z_lock);
1736 1732 zfs_znode_delete(zp, tx);
1737 1733 } else if (unlinked) {
1738 1734 mutex_exit(&zp->z_lock);
1739 1735 zfs_unlinked_add(zp, tx);
1740 1736 }
1741 1737
1742 1738 txtype = TX_REMOVE;
1743 1739 if (flags & FIGNORECASE)
1744 1740 txtype |= TX_CI;
1745 1741 zfs_log_remove(zilog, tx, txtype, dzp, name, obj);
1746 1742
1747 1743 dmu_tx_commit(tx);
1748 1744 out:
1749 1745 if (realnmp)
1750 1746 pn_free(realnmp);
1751 1747
1752 1748 zfs_dirent_unlock(dl);
1753 1749
1754 1750 if (!delete_now)
1755 1751 VN_RELE(vp);
1756 1752 if (xzp)
1757 1753 VN_RELE(ZTOV(xzp));
1758 1754
1759 1755 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1760 1756 zil_commit(zilog, 0);
1761 1757
1762 1758 ZFS_EXIT(zfsvfs);
1763 1759 return (error);
1764 1760 }
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1765 1761
1766 1762 /*
1767 1763 * Create a new directory and insert it into dvp using the name
1768 1764 * provided. Return a pointer to the inserted directory.
1769 1765 *
1770 1766 * IN: dvp - vnode of directory to add subdir to.
1771 1767 * dirname - name of new directory.
1772 1768 * vap - attributes of new directory.
1773 1769 * cr - credentials of caller.
1774 1770 * ct - caller context
1771 + * flags - case flags
1775 1772 * vsecp - ACL to be set
1776 1773 *
1777 1774 * OUT: vpp - vnode of created directory.
1778 1775 *
1779 - * RETURN: 0 if success
1780 - * error code if failure
1776 + * RETURN: 0 on success, error code on failure.
1781 1777 *
1782 1778 * Timestamps:
1783 1779 * dvp - ctime|mtime updated
1784 1780 * vp - ctime|mtime|atime updated
1785 1781 */
1786 1782 /*ARGSUSED*/
1787 1783 static int
1788 1784 zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr,
1789 1785 caller_context_t *ct, int flags, vsecattr_t *vsecp)
1790 1786 {
1791 1787 znode_t *zp, *dzp = VTOZ(dvp);
1792 1788 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1793 1789 zilog_t *zilog;
1794 1790 zfs_dirlock_t *dl;
1795 1791 uint64_t txtype;
1796 1792 dmu_tx_t *tx;
1797 1793 int error;
1798 1794 int zf = ZNEW;
1799 1795 ksid_t *ksid;
1800 1796 uid_t uid;
1801 1797 gid_t gid = crgetgid(cr);
1802 1798 zfs_acl_ids_t acl_ids;
1803 1799 boolean_t fuid_dirtied;
1804 1800
1805 1801 ASSERT(vap->va_type == VDIR);
1806 1802
1807 1803 /*
1808 1804 * If we have an ephemeral id, ACL, or XVATTR then
1809 1805 * make sure file system is at proper version
1810 1806 */
1811 1807
1812 1808 ksid = crgetsid(cr, KSID_OWNER);
1813 1809 if (ksid)
1814 1810 uid = ksid_getid(ksid);
1815 1811 else
1816 1812 uid = crgetuid(cr);
1817 1813 if (zfsvfs->z_use_fuids == B_FALSE &&
1818 1814 (vsecp || (vap->va_mask & AT_XVATTR) ||
1819 1815 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1820 1816 return (SET_ERROR(EINVAL));
1821 1817
1822 1818 ZFS_ENTER(zfsvfs);
1823 1819 ZFS_VERIFY_ZP(dzp);
1824 1820 zilog = zfsvfs->z_log;
1825 1821
1826 1822 if (dzp->z_pflags & ZFS_XATTR) {
1827 1823 ZFS_EXIT(zfsvfs);
1828 1824 return (SET_ERROR(EINVAL));
1829 1825 }
1830 1826
1831 1827 if (zfsvfs->z_utf8 && u8_validate(dirname,
1832 1828 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1833 1829 ZFS_EXIT(zfsvfs);
1834 1830 return (SET_ERROR(EILSEQ));
1835 1831 }
1836 1832 if (flags & FIGNORECASE)
1837 1833 zf |= ZCILOOK;
1838 1834
1839 1835 if (vap->va_mask & AT_XVATTR) {
1840 1836 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1841 1837 crgetuid(cr), cr, vap->va_type)) != 0) {
1842 1838 ZFS_EXIT(zfsvfs);
1843 1839 return (error);
1844 1840 }
1845 1841 }
1846 1842
1847 1843 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
1848 1844 vsecp, &acl_ids)) != 0) {
1849 1845 ZFS_EXIT(zfsvfs);
1850 1846 return (error);
1851 1847 }
1852 1848 /*
1853 1849 * First make sure the new directory doesn't exist.
1854 1850 *
1855 1851 * Existence is checked first to make sure we don't return
1856 1852 * EACCES instead of EEXIST which can cause some applications
1857 1853 * to fail.
1858 1854 */
1859 1855 top:
1860 1856 *vpp = NULL;
1861 1857
1862 1858 if (error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
1863 1859 NULL, NULL)) {
1864 1860 zfs_acl_ids_free(&acl_ids);
1865 1861 ZFS_EXIT(zfsvfs);
1866 1862 return (error);
1867 1863 }
1868 1864
1869 1865 if (error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr)) {
1870 1866 zfs_acl_ids_free(&acl_ids);
1871 1867 zfs_dirent_unlock(dl);
1872 1868 ZFS_EXIT(zfsvfs);
1873 1869 return (error);
1874 1870 }
1875 1871
1876 1872 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
1877 1873 zfs_acl_ids_free(&acl_ids);
1878 1874 zfs_dirent_unlock(dl);
1879 1875 ZFS_EXIT(zfsvfs);
1880 1876 return (SET_ERROR(EDQUOT));
1881 1877 }
1882 1878
1883 1879 /*
1884 1880 * Add a new entry to the directory.
1885 1881 */
1886 1882 tx = dmu_tx_create(zfsvfs->z_os);
1887 1883 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
1888 1884 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
1889 1885 fuid_dirtied = zfsvfs->z_fuid_dirty;
1890 1886 if (fuid_dirtied)
1891 1887 zfs_fuid_txhold(zfsvfs, tx);
1892 1888 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1893 1889 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
1894 1890 acl_ids.z_aclp->z_acl_bytes);
1895 1891 }
1896 1892
1897 1893 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1898 1894 ZFS_SA_BASE_ATTR_SIZE);
1899 1895
1900 1896 error = dmu_tx_assign(tx, TXG_NOWAIT);
1901 1897 if (error) {
1902 1898 zfs_dirent_unlock(dl);
1903 1899 if (error == ERESTART) {
1904 1900 dmu_tx_wait(tx);
1905 1901 dmu_tx_abort(tx);
1906 1902 goto top;
1907 1903 }
1908 1904 zfs_acl_ids_free(&acl_ids);
1909 1905 dmu_tx_abort(tx);
1910 1906 ZFS_EXIT(zfsvfs);
1911 1907 return (error);
1912 1908 }
1913 1909
1914 1910 /*
1915 1911 * Create new node.
1916 1912 */
1917 1913 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1918 1914
1919 1915 if (fuid_dirtied)
1920 1916 zfs_fuid_sync(zfsvfs, tx);
1921 1917
1922 1918 /*
1923 1919 * Now put new name in parent dir.
1924 1920 */
1925 1921 (void) zfs_link_create(dl, zp, tx, ZNEW);
1926 1922
1927 1923 *vpp = ZTOV(zp);
1928 1924
1929 1925 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
1930 1926 if (flags & FIGNORECASE)
1931 1927 txtype |= TX_CI;
1932 1928 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
1933 1929 acl_ids.z_fuidp, vap);
1934 1930
1935 1931 zfs_acl_ids_free(&acl_ids);
1936 1932
1937 1933 dmu_tx_commit(tx);
1938 1934
1939 1935 zfs_dirent_unlock(dl);
1940 1936
1941 1937 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1942 1938 zil_commit(zilog, 0);
1943 1939
1944 1940 ZFS_EXIT(zfsvfs);
1945 1941 return (0);
1946 1942 }
1947 1943
1948 1944 /*
1949 1945 * Remove a directory subdir entry. If the current working
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1950 1946 * directory is the same as the subdir to be removed, the
1951 1947 * remove will fail.
1952 1948 *
1953 1949 * IN: dvp - vnode of directory to remove from.
1954 1950 * name - name of directory to be removed.
1955 1951 * cwd - vnode of current working directory.
1956 1952 * cr - credentials of caller.
1957 1953 * ct - caller context
1958 1954 * flags - case flags
1959 1955 *
1960 - * RETURN: 0 if success
1961 - * error code if failure
1956 + * RETURN: 0 on success, error code on failure.
1962 1957 *
1963 1958 * Timestamps:
1964 1959 * dvp - ctime|mtime updated
1965 1960 */
1966 1961 /*ARGSUSED*/
1967 1962 static int
1968 1963 zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr,
1969 1964 caller_context_t *ct, int flags)
1970 1965 {
1971 1966 znode_t *dzp = VTOZ(dvp);
1972 1967 znode_t *zp;
1973 1968 vnode_t *vp;
1974 1969 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1975 1970 zilog_t *zilog;
1976 1971 zfs_dirlock_t *dl;
1977 1972 dmu_tx_t *tx;
1978 1973 int error;
1979 1974 int zflg = ZEXISTS;
1980 1975
1981 1976 ZFS_ENTER(zfsvfs);
1982 1977 ZFS_VERIFY_ZP(dzp);
1983 1978 zilog = zfsvfs->z_log;
1984 1979
1985 1980 if (flags & FIGNORECASE)
1986 1981 zflg |= ZCILOOK;
1987 1982 top:
1988 1983 zp = NULL;
1989 1984
1990 1985 /*
1991 1986 * Attempt to lock directory; fail if entry doesn't exist.
1992 1987 */
1993 1988 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1994 1989 NULL, NULL)) {
1995 1990 ZFS_EXIT(zfsvfs);
1996 1991 return (error);
1997 1992 }
1998 1993
1999 1994 vp = ZTOV(zp);
2000 1995
2001 1996 if (error = zfs_zaccess_delete(dzp, zp, cr)) {
2002 1997 goto out;
2003 1998 }
2004 1999
2005 2000 if (vp->v_type != VDIR) {
2006 2001 error = SET_ERROR(ENOTDIR);
2007 2002 goto out;
2008 2003 }
2009 2004
2010 2005 if (vp == cwd) {
2011 2006 error = SET_ERROR(EINVAL);
2012 2007 goto out;
2013 2008 }
2014 2009
2015 2010 vnevent_rmdir(vp, dvp, name, ct);
2016 2011
2017 2012 /*
2018 2013 * Grab a lock on the directory to make sure that noone is
2019 2014 * trying to add (or lookup) entries while we are removing it.
2020 2015 */
2021 2016 rw_enter(&zp->z_name_lock, RW_WRITER);
2022 2017
2023 2018 /*
2024 2019 * Grab a lock on the parent pointer to make sure we play well
2025 2020 * with the treewalk and directory rename code.
2026 2021 */
2027 2022 rw_enter(&zp->z_parent_lock, RW_WRITER);
2028 2023
2029 2024 tx = dmu_tx_create(zfsvfs->z_os);
2030 2025 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
2031 2026 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2032 2027 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
2033 2028 zfs_sa_upgrade_txholds(tx, zp);
2034 2029 zfs_sa_upgrade_txholds(tx, dzp);
2035 2030 error = dmu_tx_assign(tx, TXG_NOWAIT);
2036 2031 if (error) {
2037 2032 rw_exit(&zp->z_parent_lock);
2038 2033 rw_exit(&zp->z_name_lock);
2039 2034 zfs_dirent_unlock(dl);
2040 2035 VN_RELE(vp);
2041 2036 if (error == ERESTART) {
2042 2037 dmu_tx_wait(tx);
2043 2038 dmu_tx_abort(tx);
2044 2039 goto top;
2045 2040 }
2046 2041 dmu_tx_abort(tx);
2047 2042 ZFS_EXIT(zfsvfs);
2048 2043 return (error);
2049 2044 }
2050 2045
2051 2046 error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
2052 2047
2053 2048 if (error == 0) {
2054 2049 uint64_t txtype = TX_RMDIR;
2055 2050 if (flags & FIGNORECASE)
2056 2051 txtype |= TX_CI;
2057 2052 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT);
2058 2053 }
2059 2054
2060 2055 dmu_tx_commit(tx);
2061 2056
2062 2057 rw_exit(&zp->z_parent_lock);
2063 2058 rw_exit(&zp->z_name_lock);
2064 2059 out:
2065 2060 zfs_dirent_unlock(dl);
2066 2061
2067 2062 VN_RELE(vp);
2068 2063
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2069 2064 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
2070 2065 zil_commit(zilog, 0);
2071 2066
2072 2067 ZFS_EXIT(zfsvfs);
2073 2068 return (error);
2074 2069 }
2075 2070
2076 2071 /*
2077 2072 * Read as many directory entries as will fit into the provided
2078 2073 * buffer from the given directory cursor position (specified in
2079 - * the uio structure.
2074 + * the uio structure).
2080 2075 *
2081 2076 * IN: vp - vnode of directory to read.
2082 2077 * uio - structure supplying read location, range info,
2083 2078 * and return buffer.
2084 2079 * cr - credentials of caller.
2085 2080 * ct - caller context
2086 2081 * flags - case flags
2087 2082 *
2088 2083 * OUT: uio - updated offset and range, buffer filled.
2089 2084 * eofp - set to true if end-of-file detected.
2090 2085 *
2091 - * RETURN: 0 if success
2092 - * error code if failure
2086 + * RETURN: 0 on success, error code on failure.
2093 2087 *
2094 2088 * Timestamps:
2095 2089 * vp - atime updated
2096 2090 *
2097 2091 * Note that the low 4 bits of the cookie returned by zap is always zero.
2098 2092 * This allows us to use the low range for "special" directory entries:
2099 2093 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2100 2094 * we use the offset 2 for the '.zfs' directory.
2101 2095 */
2102 2096 /* ARGSUSED */
2103 2097 static int
2104 2098 zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp,
2105 2099 caller_context_t *ct, int flags)
2106 2100 {
2107 2101 znode_t *zp = VTOZ(vp);
2108 2102 iovec_t *iovp;
2109 2103 edirent_t *eodp;
2110 2104 dirent64_t *odp;
2111 2105 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2112 2106 objset_t *os;
2113 2107 caddr_t outbuf;
2114 2108 size_t bufsize;
2115 2109 zap_cursor_t zc;
2116 2110 zap_attribute_t zap;
2117 2111 uint_t bytes_wanted;
2118 2112 uint64_t offset; /* must be unsigned; checks for < 1 */
2119 2113 uint64_t parent;
2120 2114 int local_eof;
2121 2115 int outcount;
2122 2116 int error;
2123 2117 uint8_t prefetch;
2124 2118 boolean_t check_sysattrs;
2125 2119
2126 2120 ZFS_ENTER(zfsvfs);
2127 2121 ZFS_VERIFY_ZP(zp);
2128 2122
2129 2123 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
2130 2124 &parent, sizeof (parent))) != 0) {
2131 2125 ZFS_EXIT(zfsvfs);
2132 2126 return (error);
2133 2127 }
2134 2128
2135 2129 /*
2136 2130 * If we are not given an eof variable,
2137 2131 * use a local one.
2138 2132 */
2139 2133 if (eofp == NULL)
2140 2134 eofp = &local_eof;
2141 2135
2142 2136 /*
2143 2137 * Check for valid iov_len.
2144 2138 */
2145 2139 if (uio->uio_iov->iov_len <= 0) {
2146 2140 ZFS_EXIT(zfsvfs);
2147 2141 return (SET_ERROR(EINVAL));
2148 2142 }
2149 2143
2150 2144 /*
2151 2145 * Quit if directory has been removed (posix)
2152 2146 */
2153 2147 if ((*eofp = zp->z_unlinked) != 0) {
2154 2148 ZFS_EXIT(zfsvfs);
2155 2149 return (0);
2156 2150 }
2157 2151
2158 2152 error = 0;
2159 2153 os = zfsvfs->z_os;
2160 2154 offset = uio->uio_loffset;
2161 2155 prefetch = zp->z_zn_prefetch;
2162 2156
2163 2157 /*
2164 2158 * Initialize the iterator cursor.
2165 2159 */
2166 2160 if (offset <= 3) {
2167 2161 /*
2168 2162 * Start iteration from the beginning of the directory.
2169 2163 */
2170 2164 zap_cursor_init(&zc, os, zp->z_id);
2171 2165 } else {
2172 2166 /*
2173 2167 * The offset is a serialized cursor.
2174 2168 */
2175 2169 zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
2176 2170 }
2177 2171
2178 2172 /*
2179 2173 * Get space to change directory entries into fs independent format.
2180 2174 */
2181 2175 iovp = uio->uio_iov;
2182 2176 bytes_wanted = iovp->iov_len;
2183 2177 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) {
2184 2178 bufsize = bytes_wanted;
2185 2179 outbuf = kmem_alloc(bufsize, KM_SLEEP);
2186 2180 odp = (struct dirent64 *)outbuf;
2187 2181 } else {
2188 2182 bufsize = bytes_wanted;
2189 2183 outbuf = NULL;
2190 2184 odp = (struct dirent64 *)iovp->iov_base;
2191 2185 }
2192 2186 eodp = (struct edirent *)odp;
2193 2187
2194 2188 /*
2195 2189 * If this VFS supports the system attribute view interface; and
2196 2190 * we're looking at an extended attribute directory; and we care
2197 2191 * about normalization conflicts on this vfs; then we must check
2198 2192 * for normalization conflicts with the sysattr name space.
2199 2193 */
2200 2194 check_sysattrs = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
2201 2195 (vp->v_flag & V_XATTRDIR) && zfsvfs->z_norm &&
2202 2196 (flags & V_RDDIR_ENTFLAGS);
2203 2197
2204 2198 /*
2205 2199 * Transform to file-system independent format
2206 2200 */
2207 2201 outcount = 0;
2208 2202 while (outcount < bytes_wanted) {
2209 2203 ino64_t objnum;
2210 2204 ushort_t reclen;
2211 2205 off64_t *next = NULL;
2212 2206
2213 2207 /*
2214 2208 * Special case `.', `..', and `.zfs'.
2215 2209 */
2216 2210 if (offset == 0) {
2217 2211 (void) strcpy(zap.za_name, ".");
2218 2212 zap.za_normalization_conflict = 0;
2219 2213 objnum = zp->z_id;
2220 2214 } else if (offset == 1) {
2221 2215 (void) strcpy(zap.za_name, "..");
2222 2216 zap.za_normalization_conflict = 0;
2223 2217 objnum = parent;
2224 2218 } else if (offset == 2 && zfs_show_ctldir(zp)) {
2225 2219 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
2226 2220 zap.za_normalization_conflict = 0;
2227 2221 objnum = ZFSCTL_INO_ROOT;
2228 2222 } else {
2229 2223 /*
2230 2224 * Grab next entry.
2231 2225 */
2232 2226 if (error = zap_cursor_retrieve(&zc, &zap)) {
2233 2227 if ((*eofp = (error == ENOENT)) != 0)
2234 2228 break;
2235 2229 else
2236 2230 goto update;
2237 2231 }
2238 2232
2239 2233 if (zap.za_integer_length != 8 ||
2240 2234 zap.za_num_integers != 1) {
2241 2235 cmn_err(CE_WARN, "zap_readdir: bad directory "
2242 2236 "entry, obj = %lld, offset = %lld\n",
2243 2237 (u_longlong_t)zp->z_id,
2244 2238 (u_longlong_t)offset);
2245 2239 error = SET_ERROR(ENXIO);
2246 2240 goto update;
2247 2241 }
2248 2242
2249 2243 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
2250 2244 /*
2251 2245 * MacOS X can extract the object type here such as:
2252 2246 * uint8_t type = ZFS_DIRENT_TYPE(zap.za_first_integer);
2253 2247 */
2254 2248
2255 2249 if (check_sysattrs && !zap.za_normalization_conflict) {
2256 2250 zap.za_normalization_conflict =
2257 2251 xattr_sysattr_casechk(zap.za_name);
2258 2252 }
2259 2253 }
2260 2254
2261 2255 if (flags & V_RDDIR_ACCFILTER) {
2262 2256 /*
2263 2257 * If we have no access at all, don't include
2264 2258 * this entry in the returned information
2265 2259 */
2266 2260 znode_t *ezp;
2267 2261 if (zfs_zget(zp->z_zfsvfs, objnum, &ezp) != 0)
2268 2262 goto skip_entry;
2269 2263 if (!zfs_has_access(ezp, cr)) {
2270 2264 VN_RELE(ZTOV(ezp));
2271 2265 goto skip_entry;
2272 2266 }
2273 2267 VN_RELE(ZTOV(ezp));
2274 2268 }
2275 2269
2276 2270 if (flags & V_RDDIR_ENTFLAGS)
2277 2271 reclen = EDIRENT_RECLEN(strlen(zap.za_name));
2278 2272 else
2279 2273 reclen = DIRENT64_RECLEN(strlen(zap.za_name));
2280 2274
2281 2275 /*
2282 2276 * Will this entry fit in the buffer?
2283 2277 */
2284 2278 if (outcount + reclen > bufsize) {
2285 2279 /*
2286 2280 * Did we manage to fit anything in the buffer?
2287 2281 */
2288 2282 if (!outcount) {
2289 2283 error = SET_ERROR(EINVAL);
2290 2284 goto update;
2291 2285 }
2292 2286 break;
2293 2287 }
2294 2288 if (flags & V_RDDIR_ENTFLAGS) {
2295 2289 /*
2296 2290 * Add extended flag entry:
2297 2291 */
2298 2292 eodp->ed_ino = objnum;
2299 2293 eodp->ed_reclen = reclen;
2300 2294 /* NOTE: ed_off is the offset for the *next* entry */
2301 2295 next = &(eodp->ed_off);
2302 2296 eodp->ed_eflags = zap.za_normalization_conflict ?
2303 2297 ED_CASE_CONFLICT : 0;
2304 2298 (void) strncpy(eodp->ed_name, zap.za_name,
2305 2299 EDIRENT_NAMELEN(reclen));
2306 2300 eodp = (edirent_t *)((intptr_t)eodp + reclen);
2307 2301 } else {
2308 2302 /*
2309 2303 * Add normal entry:
2310 2304 */
2311 2305 odp->d_ino = objnum;
2312 2306 odp->d_reclen = reclen;
2313 2307 /* NOTE: d_off is the offset for the *next* entry */
2314 2308 next = &(odp->d_off);
2315 2309 (void) strncpy(odp->d_name, zap.za_name,
2316 2310 DIRENT64_NAMELEN(reclen));
2317 2311 odp = (dirent64_t *)((intptr_t)odp + reclen);
2318 2312 }
2319 2313 outcount += reclen;
2320 2314
2321 2315 ASSERT(outcount <= bufsize);
2322 2316
2323 2317 /* Prefetch znode */
2324 2318 if (prefetch)
2325 2319 dmu_prefetch(os, objnum, 0, 0);
2326 2320
2327 2321 skip_entry:
2328 2322 /*
2329 2323 * Move to the next entry, fill in the previous offset.
2330 2324 */
2331 2325 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) {
2332 2326 zap_cursor_advance(&zc);
2333 2327 offset = zap_cursor_serialize(&zc);
2334 2328 } else {
2335 2329 offset += 1;
2336 2330 }
2337 2331 if (next)
2338 2332 *next = offset;
2339 2333 }
2340 2334 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
2341 2335
2342 2336 if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) {
2343 2337 iovp->iov_base += outcount;
2344 2338 iovp->iov_len -= outcount;
2345 2339 uio->uio_resid -= outcount;
2346 2340 } else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) {
2347 2341 /*
2348 2342 * Reset the pointer.
2349 2343 */
2350 2344 offset = uio->uio_loffset;
2351 2345 }
2352 2346
2353 2347 update:
2354 2348 zap_cursor_fini(&zc);
2355 2349 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
2356 2350 kmem_free(outbuf, bufsize);
2357 2351
2358 2352 if (error == ENOENT)
2359 2353 error = 0;
2360 2354
2361 2355 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
2362 2356
2363 2357 uio->uio_loffset = offset;
2364 2358 ZFS_EXIT(zfsvfs);
2365 2359 return (error);
2366 2360 }
2367 2361
2368 2362 ulong_t zfs_fsync_sync_cnt = 4;
2369 2363
2370 2364 static int
2371 2365 zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct)
2372 2366 {
2373 2367 znode_t *zp = VTOZ(vp);
2374 2368 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2375 2369
2376 2370 /*
2377 2371 * Regardless of whether this is required for standards conformance,
2378 2372 * this is the logical behavior when fsync() is called on a file with
2379 2373 * dirty pages. We use B_ASYNC since the ZIL transactions are already
2380 2374 * going to be pushed out as part of the zil_commit().
2381 2375 */
2382 2376 if (vn_has_cached_data(vp) && !(syncflag & FNODSYNC) &&
2383 2377 (vp->v_type == VREG) && !(IS_SWAPVP(vp)))
2384 2378 (void) VOP_PUTPAGE(vp, (offset_t)0, (size_t)0, B_ASYNC, cr, ct);
2385 2379
2386 2380 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt);
2387 2381
2388 2382 if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
2389 2383 ZFS_ENTER(zfsvfs);
2390 2384 ZFS_VERIFY_ZP(zp);
2391 2385 zil_commit(zfsvfs->z_log, zp->z_id);
2392 2386 ZFS_EXIT(zfsvfs);
2393 2387 }
2394 2388 return (0);
2395 2389 }
2396 2390
2397 2391
2398 2392 /*
2399 2393 * Get the requested file attributes and place them in the provided
2400 2394 * vattr structure.
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298 lines elided |
↑ open up ↑ |
2401 2395 *
2402 2396 * IN: vp - vnode of file.
2403 2397 * vap - va_mask identifies requested attributes.
2404 2398 * If AT_XVATTR set, then optional attrs are requested
2405 2399 * flags - ATTR_NOACLCHECK (CIFS server context)
2406 2400 * cr - credentials of caller.
2407 2401 * ct - caller context
2408 2402 *
2409 2403 * OUT: vap - attribute values.
2410 2404 *
2411 - * RETURN: 0 (always succeeds)
2405 + * RETURN: 0 (always succeeds).
2412 2406 */
2413 2407 /* ARGSUSED */
2414 2408 static int
2415 2409 zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
2416 2410 caller_context_t *ct)
2417 2411 {
2418 2412 znode_t *zp = VTOZ(vp);
2419 2413 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2420 2414 int error = 0;
2421 2415 uint64_t links;
2422 2416 uint64_t mtime[2], ctime[2];
2423 2417 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2424 2418 xoptattr_t *xoap = NULL;
2425 2419 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2426 2420 sa_bulk_attr_t bulk[2];
2427 2421 int count = 0;
2428 2422
2429 2423 ZFS_ENTER(zfsvfs);
2430 2424 ZFS_VERIFY_ZP(zp);
2431 2425
2432 2426 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);
2433 2427
2434 2428 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
2435 2429 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
2436 2430
2437 2431 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
2438 2432 ZFS_EXIT(zfsvfs);
2439 2433 return (error);
2440 2434 }
2441 2435
2442 2436 /*
2443 2437 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2444 2438 * Also, if we are the owner don't bother, since owner should
2445 2439 * always be allowed to read basic attributes of file.
2446 2440 */
2447 2441 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
2448 2442 (vap->va_uid != crgetuid(cr))) {
2449 2443 if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
2450 2444 skipaclchk, cr)) {
2451 2445 ZFS_EXIT(zfsvfs);
2452 2446 return (error);
2453 2447 }
2454 2448 }
2455 2449
2456 2450 /*
2457 2451 * Return all attributes. It's cheaper to provide the answer
2458 2452 * than to determine whether we were asked the question.
2459 2453 */
2460 2454
2461 2455 mutex_enter(&zp->z_lock);
2462 2456 vap->va_type = vp->v_type;
2463 2457 vap->va_mode = zp->z_mode & MODEMASK;
2464 2458 vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev;
2465 2459 vap->va_nodeid = zp->z_id;
2466 2460 if ((vp->v_flag & VROOT) && zfs_show_ctldir(zp))
2467 2461 links = zp->z_links + 1;
2468 2462 else
2469 2463 links = zp->z_links;
2470 2464 vap->va_nlink = MIN(links, UINT32_MAX); /* nlink_t limit! */
2471 2465 vap->va_size = zp->z_size;
2472 2466 vap->va_rdev = vp->v_rdev;
2473 2467 vap->va_seq = zp->z_seq;
2474 2468
2475 2469 /*
2476 2470 * Add in any requested optional attributes and the create time.
2477 2471 * Also set the corresponding bits in the returned attribute bitmap.
2478 2472 */
2479 2473 if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) {
2480 2474 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
2481 2475 xoap->xoa_archive =
2482 2476 ((zp->z_pflags & ZFS_ARCHIVE) != 0);
2483 2477 XVA_SET_RTN(xvap, XAT_ARCHIVE);
2484 2478 }
2485 2479
2486 2480 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
2487 2481 xoap->xoa_readonly =
2488 2482 ((zp->z_pflags & ZFS_READONLY) != 0);
2489 2483 XVA_SET_RTN(xvap, XAT_READONLY);
2490 2484 }
2491 2485
2492 2486 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
2493 2487 xoap->xoa_system =
2494 2488 ((zp->z_pflags & ZFS_SYSTEM) != 0);
2495 2489 XVA_SET_RTN(xvap, XAT_SYSTEM);
2496 2490 }
2497 2491
2498 2492 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
2499 2493 xoap->xoa_hidden =
2500 2494 ((zp->z_pflags & ZFS_HIDDEN) != 0);
2501 2495 XVA_SET_RTN(xvap, XAT_HIDDEN);
2502 2496 }
2503 2497
2504 2498 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2505 2499 xoap->xoa_nounlink =
2506 2500 ((zp->z_pflags & ZFS_NOUNLINK) != 0);
2507 2501 XVA_SET_RTN(xvap, XAT_NOUNLINK);
2508 2502 }
2509 2503
2510 2504 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2511 2505 xoap->xoa_immutable =
2512 2506 ((zp->z_pflags & ZFS_IMMUTABLE) != 0);
2513 2507 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
2514 2508 }
2515 2509
2516 2510 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2517 2511 xoap->xoa_appendonly =
2518 2512 ((zp->z_pflags & ZFS_APPENDONLY) != 0);
2519 2513 XVA_SET_RTN(xvap, XAT_APPENDONLY);
2520 2514 }
2521 2515
2522 2516 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2523 2517 xoap->xoa_nodump =
2524 2518 ((zp->z_pflags & ZFS_NODUMP) != 0);
2525 2519 XVA_SET_RTN(xvap, XAT_NODUMP);
2526 2520 }
2527 2521
2528 2522 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
2529 2523 xoap->xoa_opaque =
2530 2524 ((zp->z_pflags & ZFS_OPAQUE) != 0);
2531 2525 XVA_SET_RTN(xvap, XAT_OPAQUE);
2532 2526 }
2533 2527
2534 2528 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2535 2529 xoap->xoa_av_quarantined =
2536 2530 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
2537 2531 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
2538 2532 }
2539 2533
2540 2534 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2541 2535 xoap->xoa_av_modified =
2542 2536 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
2543 2537 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
2544 2538 }
2545 2539
2546 2540 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
2547 2541 vp->v_type == VREG) {
2548 2542 zfs_sa_get_scanstamp(zp, xvap);
2549 2543 }
2550 2544
2551 2545 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
2552 2546 uint64_t times[2];
2553 2547
2554 2548 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
2555 2549 times, sizeof (times));
2556 2550 ZFS_TIME_DECODE(&xoap->xoa_createtime, times);
2557 2551 XVA_SET_RTN(xvap, XAT_CREATETIME);
2558 2552 }
2559 2553
2560 2554 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2561 2555 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
2562 2556 XVA_SET_RTN(xvap, XAT_REPARSE);
2563 2557 }
2564 2558 if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
2565 2559 xoap->xoa_generation = zp->z_gen;
2566 2560 XVA_SET_RTN(xvap, XAT_GEN);
2567 2561 }
2568 2562
2569 2563 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
2570 2564 xoap->xoa_offline =
2571 2565 ((zp->z_pflags & ZFS_OFFLINE) != 0);
2572 2566 XVA_SET_RTN(xvap, XAT_OFFLINE);
2573 2567 }
2574 2568
2575 2569 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
2576 2570 xoap->xoa_sparse =
2577 2571 ((zp->z_pflags & ZFS_SPARSE) != 0);
2578 2572 XVA_SET_RTN(xvap, XAT_SPARSE);
2579 2573 }
2580 2574 }
2581 2575
2582 2576 ZFS_TIME_DECODE(&vap->va_atime, zp->z_atime);
2583 2577 ZFS_TIME_DECODE(&vap->va_mtime, mtime);
2584 2578 ZFS_TIME_DECODE(&vap->va_ctime, ctime);
2585 2579
2586 2580 mutex_exit(&zp->z_lock);
2587 2581
2588 2582 sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks);
2589 2583
2590 2584 if (zp->z_blksz == 0) {
2591 2585 /*
2592 2586 * Block size hasn't been set; suggest maximal I/O transfers.
2593 2587 */
2594 2588 vap->va_blksize = zfsvfs->z_max_blksz;
2595 2589 }
2596 2590
2597 2591 ZFS_EXIT(zfsvfs);
2598 2592 return (0);
2599 2593 }
2600 2594
2601 2595 /*
2602 2596 * Set the file attributes to the values contained in the
|
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181 lines elided |
↑ open up ↑ |
2603 2597 * vattr structure.
2604 2598 *
2605 2599 * IN: vp - vnode of file to be modified.
2606 2600 * vap - new attribute values.
2607 2601 * If AT_XVATTR set, then optional attrs are being set
2608 2602 * flags - ATTR_UTIME set if non-default time values provided.
2609 2603 * - ATTR_NOACLCHECK (CIFS context only).
2610 2604 * cr - credentials of caller.
2611 2605 * ct - caller context
2612 2606 *
2613 - * RETURN: 0 if success
2614 - * error code if failure
2607 + * RETURN: 0 on success, error code on failure.
2615 2608 *
2616 2609 * Timestamps:
2617 2610 * vp - ctime updated, mtime updated if size changed.
2618 2611 */
2619 2612 /* ARGSUSED */
2620 2613 static int
2621 2614 zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
2622 - caller_context_t *ct)
2615 + caller_context_t *ct)
2623 2616 {
2624 2617 znode_t *zp = VTOZ(vp);
2625 2618 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2626 2619 zilog_t *zilog;
2627 2620 dmu_tx_t *tx;
2628 2621 vattr_t oldva;
2629 2622 xvattr_t tmpxvattr;
2630 2623 uint_t mask = vap->va_mask;
2631 2624 uint_t saved_mask = 0;
2632 2625 int trim_mask = 0;
2633 2626 uint64_t new_mode;
2634 2627 uint64_t new_uid, new_gid;
2635 2628 uint64_t xattr_obj;
2636 2629 uint64_t mtime[2], ctime[2];
2637 2630 znode_t *attrzp;
2638 2631 int need_policy = FALSE;
2639 2632 int err, err2;
2640 2633 zfs_fuid_info_t *fuidp = NULL;
2641 2634 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2642 2635 xoptattr_t *xoap;
2643 2636 zfs_acl_t *aclp;
2644 2637 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2645 2638 boolean_t fuid_dirtied = B_FALSE;
2646 2639 sa_bulk_attr_t bulk[7], xattr_bulk[7];
2647 2640 int count = 0, xattr_count = 0;
2648 2641
2649 2642 if (mask == 0)
2650 2643 return (0);
2651 2644
2652 2645 if (mask & AT_NOSET)
2653 2646 return (SET_ERROR(EINVAL));
2654 2647
2655 2648 ZFS_ENTER(zfsvfs);
2656 2649 ZFS_VERIFY_ZP(zp);
2657 2650
2658 2651 zilog = zfsvfs->z_log;
2659 2652
2660 2653 /*
2661 2654 * Make sure that if we have ephemeral uid/gid or xvattr specified
2662 2655 * that file system is at proper version level
2663 2656 */
2664 2657
2665 2658 if (zfsvfs->z_use_fuids == B_FALSE &&
2666 2659 (((mask & AT_UID) && IS_EPHEMERAL(vap->va_uid)) ||
2667 2660 ((mask & AT_GID) && IS_EPHEMERAL(vap->va_gid)) ||
2668 2661 (mask & AT_XVATTR))) {
2669 2662 ZFS_EXIT(zfsvfs);
2670 2663 return (SET_ERROR(EINVAL));
2671 2664 }
2672 2665
2673 2666 if (mask & AT_SIZE && vp->v_type == VDIR) {
2674 2667 ZFS_EXIT(zfsvfs);
2675 2668 return (SET_ERROR(EISDIR));
2676 2669 }
2677 2670
2678 2671 if (mask & AT_SIZE && vp->v_type != VREG && vp->v_type != VFIFO) {
2679 2672 ZFS_EXIT(zfsvfs);
2680 2673 return (SET_ERROR(EINVAL));
2681 2674 }
2682 2675
2683 2676 /*
2684 2677 * If this is an xvattr_t, then get a pointer to the structure of
2685 2678 * optional attributes. If this is NULL, then we have a vattr_t.
2686 2679 */
2687 2680 xoap = xva_getxoptattr(xvap);
2688 2681
2689 2682 xva_init(&tmpxvattr);
2690 2683
2691 2684 /*
2692 2685 * Immutable files can only alter immutable bit and atime
2693 2686 */
2694 2687 if ((zp->z_pflags & ZFS_IMMUTABLE) &&
2695 2688 ((mask & (AT_SIZE|AT_UID|AT_GID|AT_MTIME|AT_MODE)) ||
2696 2689 ((mask & AT_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
2697 2690 ZFS_EXIT(zfsvfs);
2698 2691 return (SET_ERROR(EPERM));
2699 2692 }
2700 2693
2701 2694 if ((mask & AT_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
2702 2695 ZFS_EXIT(zfsvfs);
2703 2696 return (SET_ERROR(EPERM));
2704 2697 }
2705 2698
2706 2699 /*
2707 2700 * Verify timestamps doesn't overflow 32 bits.
2708 2701 * ZFS can handle large timestamps, but 32bit syscalls can't
2709 2702 * handle times greater than 2039. This check should be removed
2710 2703 * once large timestamps are fully supported.
2711 2704 */
2712 2705 if (mask & (AT_ATIME | AT_MTIME)) {
2713 2706 if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) ||
2714 2707 ((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) {
2715 2708 ZFS_EXIT(zfsvfs);
2716 2709 return (SET_ERROR(EOVERFLOW));
2717 2710 }
2718 2711 }
2719 2712
2720 2713 top:
2721 2714 attrzp = NULL;
2722 2715 aclp = NULL;
2723 2716
2724 2717 /* Can this be moved to before the top label? */
2725 2718 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
2726 2719 ZFS_EXIT(zfsvfs);
2727 2720 return (SET_ERROR(EROFS));
2728 2721 }
2729 2722
2730 2723 /*
2731 2724 * First validate permissions
2732 2725 */
2733 2726
2734 2727 if (mask & AT_SIZE) {
2735 2728 err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
2736 2729 if (err) {
2737 2730 ZFS_EXIT(zfsvfs);
2738 2731 return (err);
2739 2732 }
2740 2733 /*
2741 2734 * XXX - Note, we are not providing any open
2742 2735 * mode flags here (like FNDELAY), so we may
2743 2736 * block if there are locks present... this
2744 2737 * should be addressed in openat().
2745 2738 */
2746 2739 /* XXX - would it be OK to generate a log record here? */
2747 2740 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
2748 2741 if (err) {
2749 2742 ZFS_EXIT(zfsvfs);
2750 2743 return (err);
2751 2744 }
2752 2745 }
2753 2746
2754 2747 if (mask & (AT_ATIME|AT_MTIME) ||
2755 2748 ((mask & AT_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) ||
2756 2749 XVA_ISSET_REQ(xvap, XAT_READONLY) ||
2757 2750 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) ||
2758 2751 XVA_ISSET_REQ(xvap, XAT_OFFLINE) ||
2759 2752 XVA_ISSET_REQ(xvap, XAT_SPARSE) ||
2760 2753 XVA_ISSET_REQ(xvap, XAT_CREATETIME) ||
2761 2754 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
2762 2755 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
2763 2756 skipaclchk, cr);
2764 2757 }
2765 2758
2766 2759 if (mask & (AT_UID|AT_GID)) {
2767 2760 int idmask = (mask & (AT_UID|AT_GID));
2768 2761 int take_owner;
2769 2762 int take_group;
2770 2763
2771 2764 /*
2772 2765 * NOTE: even if a new mode is being set,
2773 2766 * we may clear S_ISUID/S_ISGID bits.
2774 2767 */
2775 2768
2776 2769 if (!(mask & AT_MODE))
2777 2770 vap->va_mode = zp->z_mode;
2778 2771
2779 2772 /*
2780 2773 * Take ownership or chgrp to group we are a member of
2781 2774 */
2782 2775
2783 2776 take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr));
2784 2777 take_group = (mask & AT_GID) &&
2785 2778 zfs_groupmember(zfsvfs, vap->va_gid, cr);
2786 2779
2787 2780 /*
2788 2781 * If both AT_UID and AT_GID are set then take_owner and
2789 2782 * take_group must both be set in order to allow taking
2790 2783 * ownership.
2791 2784 *
2792 2785 * Otherwise, send the check through secpolicy_vnode_setattr()
2793 2786 *
2794 2787 */
2795 2788
2796 2789 if (((idmask == (AT_UID|AT_GID)) && take_owner && take_group) ||
2797 2790 ((idmask == AT_UID) && take_owner) ||
2798 2791 ((idmask == AT_GID) && take_group)) {
2799 2792 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
2800 2793 skipaclchk, cr) == 0) {
2801 2794 /*
2802 2795 * Remove setuid/setgid for non-privileged users
2803 2796 */
2804 2797 secpolicy_setid_clear(vap, cr);
2805 2798 trim_mask = (mask & (AT_UID|AT_GID));
2806 2799 } else {
2807 2800 need_policy = TRUE;
2808 2801 }
2809 2802 } else {
2810 2803 need_policy = TRUE;
2811 2804 }
2812 2805 }
2813 2806
2814 2807 mutex_enter(&zp->z_lock);
2815 2808 oldva.va_mode = zp->z_mode;
2816 2809 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
2817 2810 if (mask & AT_XVATTR) {
2818 2811 /*
2819 2812 * Update xvattr mask to include only those attributes
2820 2813 * that are actually changing.
2821 2814 *
2822 2815 * the bits will be restored prior to actually setting
2823 2816 * the attributes so the caller thinks they were set.
2824 2817 */
2825 2818 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2826 2819 if (xoap->xoa_appendonly !=
2827 2820 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
2828 2821 need_policy = TRUE;
2829 2822 } else {
2830 2823 XVA_CLR_REQ(xvap, XAT_APPENDONLY);
2831 2824 XVA_SET_REQ(&tmpxvattr, XAT_APPENDONLY);
2832 2825 }
2833 2826 }
2834 2827
2835 2828 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2836 2829 if (xoap->xoa_nounlink !=
2837 2830 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
2838 2831 need_policy = TRUE;
2839 2832 } else {
2840 2833 XVA_CLR_REQ(xvap, XAT_NOUNLINK);
2841 2834 XVA_SET_REQ(&tmpxvattr, XAT_NOUNLINK);
2842 2835 }
2843 2836 }
2844 2837
2845 2838 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2846 2839 if (xoap->xoa_immutable !=
2847 2840 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
2848 2841 need_policy = TRUE;
2849 2842 } else {
2850 2843 XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
2851 2844 XVA_SET_REQ(&tmpxvattr, XAT_IMMUTABLE);
2852 2845 }
2853 2846 }
2854 2847
2855 2848 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2856 2849 if (xoap->xoa_nodump !=
2857 2850 ((zp->z_pflags & ZFS_NODUMP) != 0)) {
2858 2851 need_policy = TRUE;
2859 2852 } else {
2860 2853 XVA_CLR_REQ(xvap, XAT_NODUMP);
2861 2854 XVA_SET_REQ(&tmpxvattr, XAT_NODUMP);
2862 2855 }
2863 2856 }
2864 2857
2865 2858 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2866 2859 if (xoap->xoa_av_modified !=
2867 2860 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
2868 2861 need_policy = TRUE;
2869 2862 } else {
2870 2863 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
2871 2864 XVA_SET_REQ(&tmpxvattr, XAT_AV_MODIFIED);
2872 2865 }
2873 2866 }
2874 2867
2875 2868 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2876 2869 if ((vp->v_type != VREG &&
2877 2870 xoap->xoa_av_quarantined) ||
2878 2871 xoap->xoa_av_quarantined !=
2879 2872 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
2880 2873 need_policy = TRUE;
2881 2874 } else {
2882 2875 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
2883 2876 XVA_SET_REQ(&tmpxvattr, XAT_AV_QUARANTINED);
2884 2877 }
2885 2878 }
2886 2879
2887 2880 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2888 2881 mutex_exit(&zp->z_lock);
2889 2882 ZFS_EXIT(zfsvfs);
2890 2883 return (SET_ERROR(EPERM));
2891 2884 }
2892 2885
2893 2886 if (need_policy == FALSE &&
2894 2887 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) ||
2895 2888 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
2896 2889 need_policy = TRUE;
2897 2890 }
2898 2891 }
2899 2892
2900 2893 mutex_exit(&zp->z_lock);
2901 2894
2902 2895 if (mask & AT_MODE) {
2903 2896 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
2904 2897 err = secpolicy_setid_setsticky_clear(vp, vap,
2905 2898 &oldva, cr);
2906 2899 if (err) {
2907 2900 ZFS_EXIT(zfsvfs);
2908 2901 return (err);
2909 2902 }
2910 2903 trim_mask |= AT_MODE;
2911 2904 } else {
2912 2905 need_policy = TRUE;
2913 2906 }
2914 2907 }
2915 2908
2916 2909 if (need_policy) {
2917 2910 /*
2918 2911 * If trim_mask is set then take ownership
2919 2912 * has been granted or write_acl is present and user
2920 2913 * has the ability to modify mode. In that case remove
2921 2914 * UID|GID and or MODE from mask so that
2922 2915 * secpolicy_vnode_setattr() doesn't revoke it.
2923 2916 */
2924 2917
2925 2918 if (trim_mask) {
2926 2919 saved_mask = vap->va_mask;
2927 2920 vap->va_mask &= ~trim_mask;
2928 2921 }
2929 2922 err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags,
2930 2923 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
2931 2924 if (err) {
2932 2925 ZFS_EXIT(zfsvfs);
2933 2926 return (err);
2934 2927 }
2935 2928
2936 2929 if (trim_mask)
2937 2930 vap->va_mask |= saved_mask;
2938 2931 }
2939 2932
2940 2933 /*
2941 2934 * secpolicy_vnode_setattr, or take ownership may have
2942 2935 * changed va_mask
2943 2936 */
2944 2937 mask = vap->va_mask;
2945 2938
2946 2939 if ((mask & (AT_UID | AT_GID))) {
2947 2940 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
2948 2941 &xattr_obj, sizeof (xattr_obj));
2949 2942
2950 2943 if (err == 0 && xattr_obj) {
2951 2944 err = zfs_zget(zp->z_zfsvfs, xattr_obj, &attrzp);
2952 2945 if (err)
2953 2946 goto out2;
2954 2947 }
2955 2948 if (mask & AT_UID) {
2956 2949 new_uid = zfs_fuid_create(zfsvfs,
2957 2950 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
2958 2951 if (new_uid != zp->z_uid &&
2959 2952 zfs_fuid_overquota(zfsvfs, B_FALSE, new_uid)) {
2960 2953 if (attrzp)
2961 2954 VN_RELE(ZTOV(attrzp));
2962 2955 err = SET_ERROR(EDQUOT);
2963 2956 goto out2;
2964 2957 }
2965 2958 }
2966 2959
2967 2960 if (mask & AT_GID) {
2968 2961 new_gid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid,
2969 2962 cr, ZFS_GROUP, &fuidp);
2970 2963 if (new_gid != zp->z_gid &&
2971 2964 zfs_fuid_overquota(zfsvfs, B_TRUE, new_gid)) {
2972 2965 if (attrzp)
2973 2966 VN_RELE(ZTOV(attrzp));
2974 2967 err = SET_ERROR(EDQUOT);
2975 2968 goto out2;
2976 2969 }
2977 2970 }
2978 2971 }
2979 2972 tx = dmu_tx_create(zfsvfs->z_os);
2980 2973
2981 2974 if (mask & AT_MODE) {
2982 2975 uint64_t pmode = zp->z_mode;
2983 2976 uint64_t acl_obj;
2984 2977 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
2985 2978
2986 2979 if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED &&
2987 2980 !(zp->z_pflags & ZFS_ACL_TRIVIAL)) {
2988 2981 err = SET_ERROR(EPERM);
2989 2982 goto out;
2990 2983 }
2991 2984
2992 2985 if (err = zfs_acl_chmod_setattr(zp, &aclp, new_mode))
2993 2986 goto out;
2994 2987
2995 2988 mutex_enter(&zp->z_lock);
2996 2989 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
2997 2990 /*
2998 2991 * Are we upgrading ACL from old V0 format
2999 2992 * to V1 format?
3000 2993 */
3001 2994 if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
3002 2995 zfs_znode_acl_version(zp) ==
3003 2996 ZFS_ACL_VERSION_INITIAL) {
3004 2997 dmu_tx_hold_free(tx, acl_obj, 0,
3005 2998 DMU_OBJECT_END);
3006 2999 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3007 3000 0, aclp->z_acl_bytes);
3008 3001 } else {
3009 3002 dmu_tx_hold_write(tx, acl_obj, 0,
3010 3003 aclp->z_acl_bytes);
3011 3004 }
3012 3005 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3013 3006 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3014 3007 0, aclp->z_acl_bytes);
3015 3008 }
3016 3009 mutex_exit(&zp->z_lock);
3017 3010 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3018 3011 } else {
3019 3012 if ((mask & AT_XVATTR) &&
3020 3013 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3021 3014 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3022 3015 else
3023 3016 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
3024 3017 }
3025 3018
3026 3019 if (attrzp) {
3027 3020 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
3028 3021 }
3029 3022
3030 3023 fuid_dirtied = zfsvfs->z_fuid_dirty;
3031 3024 if (fuid_dirtied)
3032 3025 zfs_fuid_txhold(zfsvfs, tx);
3033 3026
3034 3027 zfs_sa_upgrade_txholds(tx, zp);
3035 3028
3036 3029 err = dmu_tx_assign(tx, TXG_NOWAIT);
3037 3030 if (err) {
3038 3031 if (err == ERESTART)
3039 3032 dmu_tx_wait(tx);
3040 3033 goto out;
3041 3034 }
3042 3035
3043 3036 count = 0;
3044 3037 /*
3045 3038 * Set each attribute requested.
3046 3039 * We group settings according to the locks they need to acquire.
3047 3040 *
3048 3041 * Note: you cannot set ctime directly, although it will be
3049 3042 * updated as a side-effect of calling this function.
3050 3043 */
3051 3044
3052 3045
3053 3046 if (mask & (AT_UID|AT_GID|AT_MODE))
3054 3047 mutex_enter(&zp->z_acl_lock);
3055 3048 mutex_enter(&zp->z_lock);
3056 3049
3057 3050 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
3058 3051 &zp->z_pflags, sizeof (zp->z_pflags));
3059 3052
3060 3053 if (attrzp) {
3061 3054 if (mask & (AT_UID|AT_GID|AT_MODE))
3062 3055 mutex_enter(&attrzp->z_acl_lock);
3063 3056 mutex_enter(&attrzp->z_lock);
3064 3057 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3065 3058 SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags,
3066 3059 sizeof (attrzp->z_pflags));
3067 3060 }
3068 3061
3069 3062 if (mask & (AT_UID|AT_GID)) {
3070 3063
3071 3064 if (mask & AT_UID) {
3072 3065 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
3073 3066 &new_uid, sizeof (new_uid));
3074 3067 zp->z_uid = new_uid;
3075 3068 if (attrzp) {
3076 3069 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3077 3070 SA_ZPL_UID(zfsvfs), NULL, &new_uid,
3078 3071 sizeof (new_uid));
3079 3072 attrzp->z_uid = new_uid;
3080 3073 }
3081 3074 }
3082 3075
3083 3076 if (mask & AT_GID) {
3084 3077 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
3085 3078 NULL, &new_gid, sizeof (new_gid));
3086 3079 zp->z_gid = new_gid;
3087 3080 if (attrzp) {
3088 3081 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3089 3082 SA_ZPL_GID(zfsvfs), NULL, &new_gid,
3090 3083 sizeof (new_gid));
3091 3084 attrzp->z_gid = new_gid;
3092 3085 }
3093 3086 }
3094 3087 if (!(mask & AT_MODE)) {
3095 3088 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs),
3096 3089 NULL, &new_mode, sizeof (new_mode));
3097 3090 new_mode = zp->z_mode;
3098 3091 }
3099 3092 err = zfs_acl_chown_setattr(zp);
3100 3093 ASSERT(err == 0);
3101 3094 if (attrzp) {
3102 3095 err = zfs_acl_chown_setattr(attrzp);
3103 3096 ASSERT(err == 0);
3104 3097 }
3105 3098 }
3106 3099
3107 3100 if (mask & AT_MODE) {
3108 3101 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
3109 3102 &new_mode, sizeof (new_mode));
3110 3103 zp->z_mode = new_mode;
3111 3104 ASSERT3U((uintptr_t)aclp, !=, NULL);
3112 3105 err = zfs_aclset_common(zp, aclp, cr, tx);
3113 3106 ASSERT0(err);
3114 3107 if (zp->z_acl_cached)
3115 3108 zfs_acl_free(zp->z_acl_cached);
3116 3109 zp->z_acl_cached = aclp;
3117 3110 aclp = NULL;
3118 3111 }
3119 3112
3120 3113
3121 3114 if (mask & AT_ATIME) {
3122 3115 ZFS_TIME_ENCODE(&vap->va_atime, zp->z_atime);
3123 3116 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
3124 3117 &zp->z_atime, sizeof (zp->z_atime));
3125 3118 }
3126 3119
3127 3120 if (mask & AT_MTIME) {
3128 3121 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
3129 3122 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
3130 3123 mtime, sizeof (mtime));
3131 3124 }
3132 3125
3133 3126 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
3134 3127 if (mask & AT_SIZE && !(mask & AT_MTIME)) {
3135 3128 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
3136 3129 NULL, mtime, sizeof (mtime));
3137 3130 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
3138 3131 &ctime, sizeof (ctime));
3139 3132 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
3140 3133 B_TRUE);
3141 3134 } else if (mask != 0) {
3142 3135 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
3143 3136 &ctime, sizeof (ctime));
3144 3137 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime,
3145 3138 B_TRUE);
3146 3139 if (attrzp) {
3147 3140 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3148 3141 SA_ZPL_CTIME(zfsvfs), NULL,
3149 3142 &ctime, sizeof (ctime));
3150 3143 zfs_tstamp_update_setup(attrzp, STATE_CHANGED,
3151 3144 mtime, ctime, B_TRUE);
3152 3145 }
3153 3146 }
3154 3147 /*
3155 3148 * Do this after setting timestamps to prevent timestamp
3156 3149 * update from toggling bit
3157 3150 */
3158 3151
3159 3152 if (xoap && (mask & AT_XVATTR)) {
3160 3153
3161 3154 /*
3162 3155 * restore trimmed off masks
3163 3156 * so that return masks can be set for caller.
3164 3157 */
3165 3158
3166 3159 if (XVA_ISSET_REQ(&tmpxvattr, XAT_APPENDONLY)) {
3167 3160 XVA_SET_REQ(xvap, XAT_APPENDONLY);
3168 3161 }
3169 3162 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NOUNLINK)) {
3170 3163 XVA_SET_REQ(xvap, XAT_NOUNLINK);
3171 3164 }
3172 3165 if (XVA_ISSET_REQ(&tmpxvattr, XAT_IMMUTABLE)) {
3173 3166 XVA_SET_REQ(xvap, XAT_IMMUTABLE);
3174 3167 }
3175 3168 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NODUMP)) {
3176 3169 XVA_SET_REQ(xvap, XAT_NODUMP);
3177 3170 }
3178 3171 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_MODIFIED)) {
3179 3172 XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
3180 3173 }
3181 3174 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_QUARANTINED)) {
3182 3175 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
3183 3176 }
3184 3177
3185 3178 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3186 3179 ASSERT(vp->v_type == VREG);
3187 3180
3188 3181 zfs_xvattr_set(zp, xvap, tx);
3189 3182 }
3190 3183
3191 3184 if (fuid_dirtied)
3192 3185 zfs_fuid_sync(zfsvfs, tx);
3193 3186
3194 3187 if (mask != 0)
3195 3188 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);
3196 3189
3197 3190 mutex_exit(&zp->z_lock);
3198 3191 if (mask & (AT_UID|AT_GID|AT_MODE))
3199 3192 mutex_exit(&zp->z_acl_lock);
3200 3193
3201 3194 if (attrzp) {
3202 3195 if (mask & (AT_UID|AT_GID|AT_MODE))
3203 3196 mutex_exit(&attrzp->z_acl_lock);
3204 3197 mutex_exit(&attrzp->z_lock);
|
↓ open down ↓ |
572 lines elided |
↑ open up ↑ |
3205 3198 }
3206 3199 out:
3207 3200 if (err == 0 && attrzp) {
3208 3201 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
3209 3202 xattr_count, tx);
3210 3203 ASSERT(err2 == 0);
3211 3204 }
3212 3205
3213 3206 if (attrzp)
3214 3207 VN_RELE(ZTOV(attrzp));
3208 +
3215 3209 if (aclp)
3216 3210 zfs_acl_free(aclp);
3217 3211
3218 3212 if (fuidp) {
3219 3213 zfs_fuid_info_free(fuidp);
3220 3214 fuidp = NULL;
3221 3215 }
3222 3216
3223 3217 if (err) {
3224 3218 dmu_tx_abort(tx);
3225 3219 if (err == ERESTART)
3226 3220 goto top;
3227 3221 } else {
3228 3222 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
3229 3223 dmu_tx_commit(tx);
3230 3224 }
3231 3225
3232 3226 out2:
3233 3227 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3234 3228 zil_commit(zilog, 0);
3235 3229
3236 3230 ZFS_EXIT(zfsvfs);
3237 3231 return (err);
3238 3232 }
3239 3233
3240 3234 typedef struct zfs_zlock {
3241 3235 krwlock_t *zl_rwlock; /* lock we acquired */
3242 3236 znode_t *zl_znode; /* znode we held */
3243 3237 struct zfs_zlock *zl_next; /* next in list */
3244 3238 } zfs_zlock_t;
3245 3239
3246 3240 /*
3247 3241 * Drop locks and release vnodes that were held by zfs_rename_lock().
3248 3242 */
3249 3243 static void
3250 3244 zfs_rename_unlock(zfs_zlock_t **zlpp)
3251 3245 {
3252 3246 zfs_zlock_t *zl;
3253 3247
3254 3248 while ((zl = *zlpp) != NULL) {
3255 3249 if (zl->zl_znode != NULL)
3256 3250 VN_RELE(ZTOV(zl->zl_znode));
3257 3251 rw_exit(zl->zl_rwlock);
3258 3252 *zlpp = zl->zl_next;
3259 3253 kmem_free(zl, sizeof (*zl));
3260 3254 }
3261 3255 }
3262 3256
3263 3257 /*
3264 3258 * Search back through the directory tree, using the ".." entries.
3265 3259 * Lock each directory in the chain to prevent concurrent renames.
3266 3260 * Fail any attempt to move a directory into one of its own descendants.
3267 3261 * XXX - z_parent_lock can overlap with map or grow locks
3268 3262 */
3269 3263 static int
3270 3264 zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp)
3271 3265 {
3272 3266 zfs_zlock_t *zl;
3273 3267 znode_t *zp = tdzp;
3274 3268 uint64_t rootid = zp->z_zfsvfs->z_root;
3275 3269 uint64_t oidp = zp->z_id;
3276 3270 krwlock_t *rwlp = &szp->z_parent_lock;
3277 3271 krw_t rw = RW_WRITER;
3278 3272
3279 3273 /*
3280 3274 * First pass write-locks szp and compares to zp->z_id.
3281 3275 * Later passes read-lock zp and compare to zp->z_parent.
3282 3276 */
3283 3277 do {
3284 3278 if (!rw_tryenter(rwlp, rw)) {
3285 3279 /*
3286 3280 * Another thread is renaming in this path.
3287 3281 * Note that if we are a WRITER, we don't have any
3288 3282 * parent_locks held yet.
3289 3283 */
3290 3284 if (rw == RW_READER && zp->z_id > szp->z_id) {
3291 3285 /*
3292 3286 * Drop our locks and restart
3293 3287 */
3294 3288 zfs_rename_unlock(&zl);
3295 3289 *zlpp = NULL;
3296 3290 zp = tdzp;
3297 3291 oidp = zp->z_id;
3298 3292 rwlp = &szp->z_parent_lock;
3299 3293 rw = RW_WRITER;
3300 3294 continue;
3301 3295 } else {
3302 3296 /*
3303 3297 * Wait for other thread to drop its locks
3304 3298 */
3305 3299 rw_enter(rwlp, rw);
3306 3300 }
3307 3301 }
3308 3302
3309 3303 zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
3310 3304 zl->zl_rwlock = rwlp;
3311 3305 zl->zl_znode = NULL;
3312 3306 zl->zl_next = *zlpp;
3313 3307 *zlpp = zl;
3314 3308
3315 3309 if (oidp == szp->z_id) /* We're a descendant of szp */
3316 3310 return (SET_ERROR(EINVAL));
3317 3311
3318 3312 if (oidp == rootid) /* We've hit the top */
3319 3313 return (0);
3320 3314
3321 3315 if (rw == RW_READER) { /* i.e. not the first pass */
3322 3316 int error = zfs_zget(zp->z_zfsvfs, oidp, &zp);
3323 3317 if (error)
3324 3318 return (error);
3325 3319 zl->zl_znode = zp;
3326 3320 }
3327 3321 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zp->z_zfsvfs),
3328 3322 &oidp, sizeof (oidp));
3329 3323 rwlp = &zp->z_parent_lock;
3330 3324 rw = RW_READER;
3331 3325
3332 3326 } while (zp->z_id != sdzp->z_id);
3333 3327
3334 3328 return (0);
3335 3329 }
3336 3330
3337 3331 /*
3338 3332 * Move an entry from the provided source directory to the target
|
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114 lines elided |
↑ open up ↑ |
3339 3333 * directory. Change the entry name as indicated.
3340 3334 *
3341 3335 * IN: sdvp - Source directory containing the "old entry".
3342 3336 * snm - Old entry name.
3343 3337 * tdvp - Target directory to contain the "new entry".
3344 3338 * tnm - New entry name.
3345 3339 * cr - credentials of caller.
3346 3340 * ct - caller context
3347 3341 * flags - case flags
3348 3342 *
3349 - * RETURN: 0 if success
3350 - * error code if failure
3343 + * RETURN: 0 on success, error code on failure.
3351 3344 *
3352 3345 * Timestamps:
3353 3346 * sdvp,tdvp - ctime|mtime updated
3354 3347 */
3355 3348 /*ARGSUSED*/
3356 3349 static int
3357 3350 zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr,
3358 3351 caller_context_t *ct, int flags)
3359 3352 {
3360 3353 znode_t *tdzp, *szp, *tzp;
3361 3354 znode_t *sdzp = VTOZ(sdvp);
3362 3355 zfsvfs_t *zfsvfs = sdzp->z_zfsvfs;
3363 3356 zilog_t *zilog;
3364 3357 vnode_t *realvp;
3365 3358 zfs_dirlock_t *sdl, *tdl;
3366 3359 dmu_tx_t *tx;
3367 3360 zfs_zlock_t *zl;
3368 3361 int cmp, serr, terr;
3369 3362 int error = 0;
3370 3363 int zflg = 0;
3371 3364
3372 3365 ZFS_ENTER(zfsvfs);
3373 3366 ZFS_VERIFY_ZP(sdzp);
3374 3367 zilog = zfsvfs->z_log;
3375 3368
3376 3369 /*
3377 3370 * Make sure we have the real vp for the target directory.
3378 3371 */
3379 3372 if (VOP_REALVP(tdvp, &realvp, ct) == 0)
3380 3373 tdvp = realvp;
3381 3374
3382 3375 if (tdvp->v_vfsp != sdvp->v_vfsp || zfsctl_is_node(tdvp)) {
3383 3376 ZFS_EXIT(zfsvfs);
3384 3377 return (SET_ERROR(EXDEV));
3385 3378 }
3386 3379
3387 3380 tdzp = VTOZ(tdvp);
3388 3381 ZFS_VERIFY_ZP(tdzp);
3389 3382 if (zfsvfs->z_utf8 && u8_validate(tnm,
3390 3383 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3391 3384 ZFS_EXIT(zfsvfs);
3392 3385 return (SET_ERROR(EILSEQ));
3393 3386 }
3394 3387
3395 3388 if (flags & FIGNORECASE)
3396 3389 zflg |= ZCILOOK;
3397 3390
3398 3391 top:
3399 3392 szp = NULL;
3400 3393 tzp = NULL;
3401 3394 zl = NULL;
3402 3395
3403 3396 /*
3404 3397 * This is to prevent the creation of links into attribute space
3405 3398 * by renaming a linked file into/outof an attribute directory.
3406 3399 * See the comment in zfs_link() for why this is considered bad.
3407 3400 */
3408 3401 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
3409 3402 ZFS_EXIT(zfsvfs);
3410 3403 return (SET_ERROR(EINVAL));
3411 3404 }
3412 3405
3413 3406 /*
3414 3407 * Lock source and target directory entries. To prevent deadlock,
3415 3408 * a lock ordering must be defined. We lock the directory with
3416 3409 * the smallest object id first, or if it's a tie, the one with
3417 3410 * the lexically first name.
3418 3411 */
3419 3412 if (sdzp->z_id < tdzp->z_id) {
3420 3413 cmp = -1;
3421 3414 } else if (sdzp->z_id > tdzp->z_id) {
3422 3415 cmp = 1;
3423 3416 } else {
3424 3417 /*
3425 3418 * First compare the two name arguments without
3426 3419 * considering any case folding.
3427 3420 */
3428 3421 int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER);
3429 3422
3430 3423 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
3431 3424 ASSERT(error == 0 || !zfsvfs->z_utf8);
3432 3425 if (cmp == 0) {
3433 3426 /*
3434 3427 * POSIX: "If the old argument and the new argument
3435 3428 * both refer to links to the same existing file,
3436 3429 * the rename() function shall return successfully
3437 3430 * and perform no other action."
3438 3431 */
3439 3432 ZFS_EXIT(zfsvfs);
3440 3433 return (0);
3441 3434 }
3442 3435 /*
3443 3436 * If the file system is case-folding, then we may
3444 3437 * have some more checking to do. A case-folding file
3445 3438 * system is either supporting mixed case sensitivity
3446 3439 * access or is completely case-insensitive. Note
3447 3440 * that the file system is always case preserving.
3448 3441 *
3449 3442 * In mixed sensitivity mode case sensitive behavior
3450 3443 * is the default. FIGNORECASE must be used to
3451 3444 * explicitly request case insensitive behavior.
3452 3445 *
3453 3446 * If the source and target names provided differ only
3454 3447 * by case (e.g., a request to rename 'tim' to 'Tim'),
3455 3448 * we will treat this as a special case in the
3456 3449 * case-insensitive mode: as long as the source name
3457 3450 * is an exact match, we will allow this to proceed as
3458 3451 * a name-change request.
3459 3452 */
3460 3453 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
3461 3454 (zfsvfs->z_case == ZFS_CASE_MIXED &&
3462 3455 flags & FIGNORECASE)) &&
3463 3456 u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST,
3464 3457 &error) == 0) {
3465 3458 /*
3466 3459 * case preserving rename request, require exact
3467 3460 * name matches
3468 3461 */
3469 3462 zflg |= ZCIEXACT;
3470 3463 zflg &= ~ZCILOOK;
3471 3464 }
3472 3465 }
3473 3466
3474 3467 /*
3475 3468 * If the source and destination directories are the same, we should
3476 3469 * grab the z_name_lock of that directory only once.
3477 3470 */
3478 3471 if (sdzp == tdzp) {
3479 3472 zflg |= ZHAVELOCK;
3480 3473 rw_enter(&sdzp->z_name_lock, RW_READER);
3481 3474 }
3482 3475
3483 3476 if (cmp < 0) {
3484 3477 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
3485 3478 ZEXISTS | zflg, NULL, NULL);
3486 3479 terr = zfs_dirent_lock(&tdl,
3487 3480 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL);
3488 3481 } else {
3489 3482 terr = zfs_dirent_lock(&tdl,
3490 3483 tdzp, tnm, &tzp, zflg, NULL, NULL);
3491 3484 serr = zfs_dirent_lock(&sdl,
3492 3485 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg,
3493 3486 NULL, NULL);
3494 3487 }
3495 3488
3496 3489 if (serr) {
3497 3490 /*
3498 3491 * Source entry invalid or not there.
3499 3492 */
3500 3493 if (!terr) {
3501 3494 zfs_dirent_unlock(tdl);
3502 3495 if (tzp)
3503 3496 VN_RELE(ZTOV(tzp));
3504 3497 }
3505 3498
3506 3499 if (sdzp == tdzp)
3507 3500 rw_exit(&sdzp->z_name_lock);
3508 3501
3509 3502 if (strcmp(snm, "..") == 0)
3510 3503 serr = SET_ERROR(EINVAL);
3511 3504 ZFS_EXIT(zfsvfs);
3512 3505 return (serr);
3513 3506 }
3514 3507 if (terr) {
3515 3508 zfs_dirent_unlock(sdl);
3516 3509 VN_RELE(ZTOV(szp));
3517 3510
3518 3511 if (sdzp == tdzp)
3519 3512 rw_exit(&sdzp->z_name_lock);
3520 3513
3521 3514 if (strcmp(tnm, "..") == 0)
3522 3515 terr = SET_ERROR(EINVAL);
3523 3516 ZFS_EXIT(zfsvfs);
3524 3517 return (terr);
3525 3518 }
3526 3519
3527 3520 /*
3528 3521 * Must have write access at the source to remove the old entry
3529 3522 * and write access at the target to create the new entry.
3530 3523 * Note that if target and source are the same, this can be
3531 3524 * done in a single check.
3532 3525 */
3533 3526
3534 3527 if (error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr))
3535 3528 goto out;
3536 3529
3537 3530 if (ZTOV(szp)->v_type == VDIR) {
3538 3531 /*
3539 3532 * Check to make sure rename is valid.
3540 3533 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3541 3534 */
3542 3535 if (error = zfs_rename_lock(szp, tdzp, sdzp, &zl))
3543 3536 goto out;
3544 3537 }
3545 3538
3546 3539 /*
3547 3540 * Does target exist?
3548 3541 */
3549 3542 if (tzp) {
3550 3543 /*
3551 3544 * Source and target must be the same type.
3552 3545 */
3553 3546 if (ZTOV(szp)->v_type == VDIR) {
3554 3547 if (ZTOV(tzp)->v_type != VDIR) {
3555 3548 error = SET_ERROR(ENOTDIR);
3556 3549 goto out;
3557 3550 }
3558 3551 } else {
3559 3552 if (ZTOV(tzp)->v_type == VDIR) {
3560 3553 error = SET_ERROR(EISDIR);
3561 3554 goto out;
3562 3555 }
3563 3556 }
3564 3557 /*
3565 3558 * POSIX dictates that when the source and target
3566 3559 * entries refer to the same file object, rename
3567 3560 * must do nothing and exit without error.
3568 3561 */
3569 3562 if (szp->z_id == tzp->z_id) {
3570 3563 error = 0;
3571 3564 goto out;
3572 3565 }
3573 3566 }
3574 3567
3575 3568 vnevent_rename_src(ZTOV(szp), sdvp, snm, ct);
3576 3569 if (tzp)
3577 3570 vnevent_rename_dest(ZTOV(tzp), tdvp, tnm, ct);
3578 3571
3579 3572 /*
3580 3573 * notify the target directory if it is not the same
3581 3574 * as source directory.
3582 3575 */
3583 3576 if (tdvp != sdvp) {
3584 3577 vnevent_rename_dest_dir(tdvp, ct);
3585 3578 }
3586 3579
3587 3580 tx = dmu_tx_create(zfsvfs->z_os);
3588 3581 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3589 3582 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
3590 3583 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
3591 3584 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
3592 3585 if (sdzp != tdzp) {
3593 3586 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
3594 3587 zfs_sa_upgrade_txholds(tx, tdzp);
3595 3588 }
3596 3589 if (tzp) {
3597 3590 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
3598 3591 zfs_sa_upgrade_txholds(tx, tzp);
3599 3592 }
3600 3593
3601 3594 zfs_sa_upgrade_txholds(tx, szp);
3602 3595 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
3603 3596 error = dmu_tx_assign(tx, TXG_NOWAIT);
3604 3597 if (error) {
3605 3598 if (zl != NULL)
3606 3599 zfs_rename_unlock(&zl);
3607 3600 zfs_dirent_unlock(sdl);
3608 3601 zfs_dirent_unlock(tdl);
3609 3602
3610 3603 if (sdzp == tdzp)
3611 3604 rw_exit(&sdzp->z_name_lock);
3612 3605
3613 3606 VN_RELE(ZTOV(szp));
3614 3607 if (tzp)
3615 3608 VN_RELE(ZTOV(tzp));
3616 3609 if (error == ERESTART) {
3617 3610 dmu_tx_wait(tx);
3618 3611 dmu_tx_abort(tx);
3619 3612 goto top;
3620 3613 }
3621 3614 dmu_tx_abort(tx);
3622 3615 ZFS_EXIT(zfsvfs);
3623 3616 return (error);
3624 3617 }
3625 3618
3626 3619 if (tzp) /* Attempt to remove the existing target */
3627 3620 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
3628 3621
3629 3622 if (error == 0) {
3630 3623 error = zfs_link_create(tdl, szp, tx, ZRENAMING);
3631 3624 if (error == 0) {
3632 3625 szp->z_pflags |= ZFS_AV_MODIFIED;
3633 3626
3634 3627 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
3635 3628 (void *)&szp->z_pflags, sizeof (uint64_t), tx);
3636 3629 ASSERT0(error);
3637 3630
3638 3631 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
3639 3632 if (error == 0) {
3640 3633 zfs_log_rename(zilog, tx, TX_RENAME |
3641 3634 (flags & FIGNORECASE ? TX_CI : 0), sdzp,
3642 3635 sdl->dl_name, tdzp, tdl->dl_name, szp);
3643 3636
3644 3637 /*
3645 3638 * Update path information for the target vnode
3646 3639 */
3647 3640 vn_renamepath(tdvp, ZTOV(szp), tnm,
3648 3641 strlen(tnm));
3649 3642 } else {
3650 3643 /*
3651 3644 * At this point, we have successfully created
3652 3645 * the target name, but have failed to remove
3653 3646 * the source name. Since the create was done
3654 3647 * with the ZRENAMING flag, there are
3655 3648 * complications; for one, the link count is
3656 3649 * wrong. The easiest way to deal with this
3657 3650 * is to remove the newly created target, and
3658 3651 * return the original error. This must
3659 3652 * succeed; fortunately, it is very unlikely to
3660 3653 * fail, since we just created it.
3661 3654 */
3662 3655 VERIFY3U(zfs_link_destroy(tdl, szp, tx,
3663 3656 ZRENAMING, NULL), ==, 0);
3664 3657 }
3665 3658 }
3666 3659 }
3667 3660
3668 3661 dmu_tx_commit(tx);
3669 3662 out:
3670 3663 if (zl != NULL)
3671 3664 zfs_rename_unlock(&zl);
3672 3665
3673 3666 zfs_dirent_unlock(sdl);
3674 3667 zfs_dirent_unlock(tdl);
3675 3668
3676 3669 if (sdzp == tdzp)
3677 3670 rw_exit(&sdzp->z_name_lock);
3678 3671
3679 3672
3680 3673 VN_RELE(ZTOV(szp));
3681 3674 if (tzp)
3682 3675 VN_RELE(ZTOV(tzp));
3683 3676
3684 3677 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3685 3678 zil_commit(zilog, 0);
3686 3679
|
↓ open down ↓ |
326 lines elided |
↑ open up ↑ |
3687 3680 ZFS_EXIT(zfsvfs);
3688 3681 return (error);
3689 3682 }
3690 3683
3691 3684 /*
3692 3685 * Insert the indicated symbolic reference entry into the directory.
3693 3686 *
3694 3687 * IN: dvp - Directory to contain new symbolic link.
3695 3688 * link - Name for new symlink entry.
3696 3689 * vap - Attributes of new entry.
3697 - * target - Target path of new symlink.
3698 3690 * cr - credentials of caller.
3699 3691 * ct - caller context
3700 3692 * flags - case flags
3701 3693 *
3702 - * RETURN: 0 if success
3703 - * error code if failure
3694 + * RETURN: 0 on success, error code on failure.
3704 3695 *
3705 3696 * Timestamps:
3706 3697 * dvp - ctime|mtime updated
3707 3698 */
3708 3699 /*ARGSUSED*/
3709 3700 static int
3710 3701 zfs_symlink(vnode_t *dvp, char *name, vattr_t *vap, char *link, cred_t *cr,
3711 3702 caller_context_t *ct, int flags)
3712 3703 {
3713 3704 znode_t *zp, *dzp = VTOZ(dvp);
3714 3705 zfs_dirlock_t *dl;
3715 3706 dmu_tx_t *tx;
3716 3707 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
3717 3708 zilog_t *zilog;
3718 3709 uint64_t len = strlen(link);
3719 3710 int error;
3720 3711 int zflg = ZNEW;
3721 3712 zfs_acl_ids_t acl_ids;
3722 3713 boolean_t fuid_dirtied;
3723 3714 uint64_t txtype = TX_SYMLINK;
3724 3715
3725 3716 ASSERT(vap->va_type == VLNK);
3726 3717
3727 3718 ZFS_ENTER(zfsvfs);
3728 3719 ZFS_VERIFY_ZP(dzp);
3729 3720 zilog = zfsvfs->z_log;
3730 3721
3731 3722 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
3732 3723 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3733 3724 ZFS_EXIT(zfsvfs);
3734 3725 return (SET_ERROR(EILSEQ));
3735 3726 }
3736 3727 if (flags & FIGNORECASE)
3737 3728 zflg |= ZCILOOK;
3738 3729
3739 3730 if (len > MAXPATHLEN) {
3740 3731 ZFS_EXIT(zfsvfs);
3741 3732 return (SET_ERROR(ENAMETOOLONG));
3742 3733 }
3743 3734
3744 3735 if ((error = zfs_acl_ids_create(dzp, 0,
3745 3736 vap, cr, NULL, &acl_ids)) != 0) {
3746 3737 ZFS_EXIT(zfsvfs);
3747 3738 return (error);
3748 3739 }
3749 3740 top:
3750 3741 /*
3751 3742 * Attempt to lock directory; fail if entry already exists.
3752 3743 */
3753 3744 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
3754 3745 if (error) {
3755 3746 zfs_acl_ids_free(&acl_ids);
3756 3747 ZFS_EXIT(zfsvfs);
3757 3748 return (error);
3758 3749 }
3759 3750
3760 3751 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) {
3761 3752 zfs_acl_ids_free(&acl_ids);
3762 3753 zfs_dirent_unlock(dl);
3763 3754 ZFS_EXIT(zfsvfs);
3764 3755 return (error);
3765 3756 }
3766 3757
3767 3758 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
3768 3759 zfs_acl_ids_free(&acl_ids);
3769 3760 zfs_dirent_unlock(dl);
3770 3761 ZFS_EXIT(zfsvfs);
3771 3762 return (SET_ERROR(EDQUOT));
3772 3763 }
3773 3764 tx = dmu_tx_create(zfsvfs->z_os);
3774 3765 fuid_dirtied = zfsvfs->z_fuid_dirty;
3775 3766 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
3776 3767 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
3777 3768 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
3778 3769 ZFS_SA_BASE_ATTR_SIZE + len);
3779 3770 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
3780 3771 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3781 3772 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
3782 3773 acl_ids.z_aclp->z_acl_bytes);
3783 3774 }
3784 3775 if (fuid_dirtied)
3785 3776 zfs_fuid_txhold(zfsvfs, tx);
3786 3777 error = dmu_tx_assign(tx, TXG_NOWAIT);
3787 3778 if (error) {
3788 3779 zfs_dirent_unlock(dl);
3789 3780 if (error == ERESTART) {
3790 3781 dmu_tx_wait(tx);
3791 3782 dmu_tx_abort(tx);
3792 3783 goto top;
3793 3784 }
3794 3785 zfs_acl_ids_free(&acl_ids);
3795 3786 dmu_tx_abort(tx);
3796 3787 ZFS_EXIT(zfsvfs);
3797 3788 return (error);
3798 3789 }
3799 3790
3800 3791 /*
3801 3792 * Create a new object for the symlink.
3802 3793 * for version 4 ZPL datsets the symlink will be an SA attribute
3803 3794 */
3804 3795 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
3805 3796
3806 3797 if (fuid_dirtied)
3807 3798 zfs_fuid_sync(zfsvfs, tx);
3808 3799
3809 3800 mutex_enter(&zp->z_lock);
3810 3801 if (zp->z_is_sa)
3811 3802 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs),
3812 3803 link, len, tx);
3813 3804 else
3814 3805 zfs_sa_symlink(zp, link, len, tx);
3815 3806 mutex_exit(&zp->z_lock);
3816 3807
3817 3808 zp->z_size = len;
3818 3809 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
3819 3810 &zp->z_size, sizeof (zp->z_size), tx);
3820 3811 /*
3821 3812 * Insert the new object into the directory.
3822 3813 */
3823 3814 (void) zfs_link_create(dl, zp, tx, ZNEW);
3824 3815
3825 3816 if (flags & FIGNORECASE)
3826 3817 txtype |= TX_CI;
3827 3818 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
3828 3819
3829 3820 zfs_acl_ids_free(&acl_ids);
3830 3821
3831 3822 dmu_tx_commit(tx);
3832 3823
3833 3824 zfs_dirent_unlock(dl);
3834 3825
3835 3826 VN_RELE(ZTOV(zp));
3836 3827
3837 3828 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3838 3829 zil_commit(zilog, 0);
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3839 3830
3840 3831 ZFS_EXIT(zfsvfs);
3841 3832 return (error);
3842 3833 }
3843 3834
3844 3835 /*
3845 3836 * Return, in the buffer contained in the provided uio structure,
3846 3837 * the symbolic path referred to by vp.
3847 3838 *
3848 3839 * IN: vp - vnode of symbolic link.
3849 - * uoip - structure to contain the link path.
3840 + * uio - structure to contain the link path.
3850 3841 * cr - credentials of caller.
3851 3842 * ct - caller context
3852 3843 *
3853 - * OUT: uio - structure to contain the link path.
3844 + * OUT: uio - structure containing the link path.
3854 3845 *
3855 - * RETURN: 0 if success
3856 - * error code if failure
3846 + * RETURN: 0 on success, error code on failure.
3857 3847 *
3858 3848 * Timestamps:
3859 3849 * vp - atime updated
3860 3850 */
3861 3851 /* ARGSUSED */
3862 3852 static int
3863 3853 zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr, caller_context_t *ct)
3864 3854 {
3865 3855 znode_t *zp = VTOZ(vp);
3866 3856 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
3867 3857 int error;
3868 3858
3869 3859 ZFS_ENTER(zfsvfs);
3870 3860 ZFS_VERIFY_ZP(zp);
3871 3861
3872 3862 mutex_enter(&zp->z_lock);
3873 3863 if (zp->z_is_sa)
3874 3864 error = sa_lookup_uio(zp->z_sa_hdl,
3875 3865 SA_ZPL_SYMLINK(zfsvfs), uio);
3876 3866 else
3877 3867 error = zfs_sa_readlink(zp, uio);
3878 3868 mutex_exit(&zp->z_lock);
3879 3869
3880 3870 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
3881 3871
3882 3872 ZFS_EXIT(zfsvfs);
3883 3873 return (error);
3884 3874 }
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3885 3875
3886 3876 /*
3887 3877 * Insert a new entry into directory tdvp referencing svp.
3888 3878 *
3889 3879 * IN: tdvp - Directory to contain new entry.
3890 3880 * svp - vnode of new entry.
3891 3881 * name - name of new entry.
3892 3882 * cr - credentials of caller.
3893 3883 * ct - caller context
3894 3884 *
3895 - * RETURN: 0 if success
3896 - * error code if failure
3885 + * RETURN: 0 on success, error code on failure.
3897 3886 *
3898 3887 * Timestamps:
3899 3888 * tdvp - ctime|mtime updated
3900 3889 * svp - ctime updated
3901 3890 */
3902 3891 /* ARGSUSED */
3903 3892 static int
3904 3893 zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr,
3905 3894 caller_context_t *ct, int flags)
3906 3895 {
3907 3896 znode_t *dzp = VTOZ(tdvp);
3908 3897 znode_t *tzp, *szp;
3909 3898 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
3910 3899 zilog_t *zilog;
3911 3900 zfs_dirlock_t *dl;
3912 3901 dmu_tx_t *tx;
3913 3902 vnode_t *realvp;
3914 3903 int error;
3915 3904 int zf = ZNEW;
3916 3905 uint64_t parent;
3917 3906 uid_t owner;
3918 3907
3919 3908 ASSERT(tdvp->v_type == VDIR);
3920 3909
3921 3910 ZFS_ENTER(zfsvfs);
3922 3911 ZFS_VERIFY_ZP(dzp);
3923 3912 zilog = zfsvfs->z_log;
3924 3913
3925 3914 if (VOP_REALVP(svp, &realvp, ct) == 0)
3926 3915 svp = realvp;
3927 3916
3928 3917 /*
3929 3918 * POSIX dictates that we return EPERM here.
3930 3919 * Better choices include ENOTSUP or EISDIR.
3931 3920 */
3932 3921 if (svp->v_type == VDIR) {
3933 3922 ZFS_EXIT(zfsvfs);
3934 3923 return (SET_ERROR(EPERM));
3935 3924 }
3936 3925
3937 3926 if (svp->v_vfsp != tdvp->v_vfsp || zfsctl_is_node(svp)) {
3938 3927 ZFS_EXIT(zfsvfs);
3939 3928 return (SET_ERROR(EXDEV));
3940 3929 }
3941 3930
3942 3931 szp = VTOZ(svp);
3943 3932 ZFS_VERIFY_ZP(szp);
3944 3933
3945 3934 /* Prevent links to .zfs/shares files */
3946 3935
3947 3936 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
3948 3937 &parent, sizeof (uint64_t))) != 0) {
3949 3938 ZFS_EXIT(zfsvfs);
3950 3939 return (error);
3951 3940 }
3952 3941 if (parent == zfsvfs->z_shares_dir) {
3953 3942 ZFS_EXIT(zfsvfs);
3954 3943 return (SET_ERROR(EPERM));
3955 3944 }
3956 3945
3957 3946 if (zfsvfs->z_utf8 && u8_validate(name,
3958 3947 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3959 3948 ZFS_EXIT(zfsvfs);
3960 3949 return (SET_ERROR(EILSEQ));
3961 3950 }
3962 3951 if (flags & FIGNORECASE)
3963 3952 zf |= ZCILOOK;
3964 3953
3965 3954 /*
3966 3955 * We do not support links between attributes and non-attributes
3967 3956 * because of the potential security risk of creating links
3968 3957 * into "normal" file space in order to circumvent restrictions
3969 3958 * imposed in attribute space.
3970 3959 */
3971 3960 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) {
3972 3961 ZFS_EXIT(zfsvfs);
3973 3962 return (SET_ERROR(EINVAL));
3974 3963 }
3975 3964
3976 3965
3977 3966 owner = zfs_fuid_map_id(zfsvfs, szp->z_uid, cr, ZFS_OWNER);
3978 3967 if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
3979 3968 ZFS_EXIT(zfsvfs);
3980 3969 return (SET_ERROR(EPERM));
3981 3970 }
3982 3971
3983 3972 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) {
3984 3973 ZFS_EXIT(zfsvfs);
3985 3974 return (error);
3986 3975 }
3987 3976
3988 3977 top:
3989 3978 /*
3990 3979 * Attempt to lock directory; fail if entry already exists.
3991 3980 */
3992 3981 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL);
3993 3982 if (error) {
3994 3983 ZFS_EXIT(zfsvfs);
3995 3984 return (error);
3996 3985 }
3997 3986
3998 3987 tx = dmu_tx_create(zfsvfs->z_os);
3999 3988 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
4000 3989 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
4001 3990 zfs_sa_upgrade_txholds(tx, szp);
4002 3991 zfs_sa_upgrade_txholds(tx, dzp);
4003 3992 error = dmu_tx_assign(tx, TXG_NOWAIT);
4004 3993 if (error) {
4005 3994 zfs_dirent_unlock(dl);
4006 3995 if (error == ERESTART) {
4007 3996 dmu_tx_wait(tx);
4008 3997 dmu_tx_abort(tx);
4009 3998 goto top;
4010 3999 }
4011 4000 dmu_tx_abort(tx);
4012 4001 ZFS_EXIT(zfsvfs);
4013 4002 return (error);
4014 4003 }
4015 4004
4016 4005 error = zfs_link_create(dl, szp, tx, 0);
4017 4006
4018 4007 if (error == 0) {
4019 4008 uint64_t txtype = TX_LINK;
4020 4009 if (flags & FIGNORECASE)
4021 4010 txtype |= TX_CI;
4022 4011 zfs_log_link(zilog, tx, txtype, dzp, szp, name);
4023 4012 }
4024 4013
4025 4014 dmu_tx_commit(tx);
4026 4015
4027 4016 zfs_dirent_unlock(dl);
4028 4017
4029 4018 if (error == 0) {
4030 4019 vnevent_link(svp, ct);
4031 4020 }
4032 4021
4033 4022 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4034 4023 zil_commit(zilog, 0);
4035 4024
4036 4025 ZFS_EXIT(zfsvfs);
4037 4026 return (error);
4038 4027 }
4039 4028
4040 4029 /*
4041 4030 * zfs_null_putapage() is used when the file system has been force
4042 4031 * unmounted. It just drops the pages.
4043 4032 */
4044 4033 /* ARGSUSED */
4045 4034 static int
4046 4035 zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp,
4047 4036 size_t *lenp, int flags, cred_t *cr)
4048 4037 {
4049 4038 pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR);
4050 4039 return (0);
4051 4040 }
4052 4041
4053 4042 /*
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4054 4043 * Push a page out to disk, klustering if possible.
4055 4044 *
4056 4045 * IN: vp - file to push page to.
4057 4046 * pp - page to push.
4058 4047 * flags - additional flags.
4059 4048 * cr - credentials of caller.
4060 4049 *
4061 4050 * OUT: offp - start of range pushed.
4062 4051 * lenp - len of range pushed.
4063 4052 *
4064 - * RETURN: 0 if success
4065 - * error code if failure
4053 + * RETURN: 0 on success, error code on failure.
4066 4054 *
4067 4055 * NOTE: callers must have locked the page to be pushed. On
4068 4056 * exit, the page (and all other pages in the kluster) must be
4069 4057 * unlocked.
4070 4058 */
4071 4059 /* ARGSUSED */
4072 4060 static int
4073 4061 zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp,
4074 4062 size_t *lenp, int flags, cred_t *cr)
4075 4063 {
4076 4064 znode_t *zp = VTOZ(vp);
4077 4065 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4078 4066 dmu_tx_t *tx;
4079 4067 u_offset_t off, koff;
4080 4068 size_t len, klen;
4081 4069 int err;
4082 4070
4083 4071 off = pp->p_offset;
4084 4072 len = PAGESIZE;
4085 4073 /*
4086 4074 * If our blocksize is bigger than the page size, try to kluster
4087 4075 * multiple pages so that we write a full block (thus avoiding
4088 4076 * a read-modify-write).
4089 4077 */
4090 4078 if (off < zp->z_size && zp->z_blksz > PAGESIZE) {
4091 4079 klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE);
4092 4080 koff = ISP2(klen) ? P2ALIGN(off, (u_offset_t)klen) : 0;
4093 4081 ASSERT(koff <= zp->z_size);
4094 4082 if (koff + klen > zp->z_size)
4095 4083 klen = P2ROUNDUP(zp->z_size - koff, (uint64_t)PAGESIZE);
4096 4084 pp = pvn_write_kluster(vp, pp, &off, &len, koff, klen, flags);
4097 4085 }
4098 4086 ASSERT3U(btop(len), ==, btopr(len));
4099 4087
4100 4088 /*
4101 4089 * Can't push pages past end-of-file.
4102 4090 */
4103 4091 if (off >= zp->z_size) {
4104 4092 /* ignore all pages */
4105 4093 err = 0;
4106 4094 goto out;
4107 4095 } else if (off + len > zp->z_size) {
4108 4096 int npages = btopr(zp->z_size - off);
4109 4097 page_t *trunc;
4110 4098
4111 4099 page_list_break(&pp, &trunc, npages);
4112 4100 /* ignore pages past end of file */
4113 4101 if (trunc)
4114 4102 pvn_write_done(trunc, flags);
4115 4103 len = zp->z_size - off;
4116 4104 }
4117 4105
4118 4106 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) ||
4119 4107 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) {
4120 4108 err = SET_ERROR(EDQUOT);
4121 4109 goto out;
4122 4110 }
4123 4111 top:
4124 4112 tx = dmu_tx_create(zfsvfs->z_os);
4125 4113 dmu_tx_hold_write(tx, zp->z_id, off, len);
4126 4114
4127 4115 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4128 4116 zfs_sa_upgrade_txholds(tx, zp);
4129 4117 err = dmu_tx_assign(tx, TXG_NOWAIT);
4130 4118 if (err != 0) {
4131 4119 if (err == ERESTART) {
4132 4120 dmu_tx_wait(tx);
4133 4121 dmu_tx_abort(tx);
4134 4122 goto top;
4135 4123 }
4136 4124 dmu_tx_abort(tx);
4137 4125 goto out;
4138 4126 }
4139 4127
4140 4128 if (zp->z_blksz <= PAGESIZE) {
4141 4129 caddr_t va = zfs_map_page(pp, S_READ);
4142 4130 ASSERT3U(len, <=, PAGESIZE);
4143 4131 dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx);
4144 4132 zfs_unmap_page(pp, va);
4145 4133 } else {
4146 4134 err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, pp, tx);
4147 4135 }
4148 4136
4149 4137 if (err == 0) {
4150 4138 uint64_t mtime[2], ctime[2];
4151 4139 sa_bulk_attr_t bulk[3];
4152 4140 int count = 0;
4153 4141
4154 4142 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
4155 4143 &mtime, 16);
4156 4144 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
4157 4145 &ctime, 16);
4158 4146 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
4159 4147 &zp->z_pflags, 8);
4160 4148 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
4161 4149 B_TRUE);
4162 4150 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0);
4163 4151 }
4164 4152 dmu_tx_commit(tx);
4165 4153
4166 4154 out:
4167 4155 pvn_write_done(pp, (err ? B_ERROR : 0) | flags);
4168 4156 if (offp)
4169 4157 *offp = off;
4170 4158 if (lenp)
4171 4159 *lenp = len;
4172 4160
4173 4161 return (err);
4174 4162 }
4175 4163
4176 4164 /*
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4177 4165 * Copy the portion of the file indicated from pages into the file.
4178 4166 * The pages are stored in a page list attached to the files vnode.
4179 4167 *
4180 4168 * IN: vp - vnode of file to push page data to.
4181 4169 * off - position in file to put data.
4182 4170 * len - amount of data to write.
4183 4171 * flags - flags to control the operation.
4184 4172 * cr - credentials of caller.
4185 4173 * ct - caller context.
4186 4174 *
4187 - * RETURN: 0 if success
4188 - * error code if failure
4175 + * RETURN: 0 on success, error code on failure.
4189 4176 *
4190 4177 * Timestamps:
4191 4178 * vp - ctime|mtime updated
4192 4179 */
4193 4180 /*ARGSUSED*/
4194 4181 static int
4195 4182 zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr,
4196 4183 caller_context_t *ct)
4197 4184 {
4198 4185 znode_t *zp = VTOZ(vp);
4199 4186 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4200 4187 page_t *pp;
4201 4188 size_t io_len;
4202 4189 u_offset_t io_off;
4203 4190 uint_t blksz;
4204 4191 rl_t *rl;
4205 4192 int error = 0;
4206 4193
4207 4194 ZFS_ENTER(zfsvfs);
4208 4195 ZFS_VERIFY_ZP(zp);
4209 4196
4210 4197 /*
4211 4198 * There's nothing to do if no data is cached.
4212 4199 */
4213 4200 if (!vn_has_cached_data(vp)) {
4214 4201 ZFS_EXIT(zfsvfs);
4215 4202 return (0);
4216 4203 }
4217 4204
4218 4205 /*
4219 4206 * Align this request to the file block size in case we kluster.
4220 4207 * XXX - this can result in pretty aggresive locking, which can
4221 4208 * impact simultanious read/write access. One option might be
4222 4209 * to break up long requests (len == 0) into block-by-block
4223 4210 * operations to get narrower locking.
4224 4211 */
4225 4212 blksz = zp->z_blksz;
4226 4213 if (ISP2(blksz))
4227 4214 io_off = P2ALIGN_TYPED(off, blksz, u_offset_t);
4228 4215 else
4229 4216 io_off = 0;
4230 4217 if (len > 0 && ISP2(blksz))
4231 4218 io_len = P2ROUNDUP_TYPED(len + (off - io_off), blksz, size_t);
4232 4219 else
4233 4220 io_len = 0;
4234 4221
4235 4222 if (io_len == 0) {
4236 4223 /*
4237 4224 * Search the entire vp list for pages >= io_off.
4238 4225 */
4239 4226 rl = zfs_range_lock(zp, io_off, UINT64_MAX, RL_WRITER);
4240 4227 error = pvn_vplist_dirty(vp, io_off, zfs_putapage, flags, cr);
4241 4228 goto out;
4242 4229 }
4243 4230 rl = zfs_range_lock(zp, io_off, io_len, RL_WRITER);
4244 4231
4245 4232 if (off > zp->z_size) {
4246 4233 /* past end of file */
4247 4234 zfs_range_unlock(rl);
4248 4235 ZFS_EXIT(zfsvfs);
4249 4236 return (0);
4250 4237 }
4251 4238
4252 4239 len = MIN(io_len, P2ROUNDUP(zp->z_size, PAGESIZE) - io_off);
4253 4240
4254 4241 for (off = io_off; io_off < off + len; io_off += io_len) {
4255 4242 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) {
4256 4243 pp = page_lookup(vp, io_off,
4257 4244 (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED);
4258 4245 } else {
4259 4246 pp = page_lookup_nowait(vp, io_off,
4260 4247 (flags & B_FREE) ? SE_EXCL : SE_SHARED);
4261 4248 }
4262 4249
4263 4250 if (pp != NULL && pvn_getdirty(pp, flags)) {
4264 4251 int err;
4265 4252
4266 4253 /*
4267 4254 * Found a dirty page to push
4268 4255 */
4269 4256 err = zfs_putapage(vp, pp, &io_off, &io_len, flags, cr);
4270 4257 if (err)
4271 4258 error = err;
4272 4259 } else {
4273 4260 io_len = PAGESIZE;
4274 4261 }
4275 4262 }
4276 4263 out:
4277 4264 zfs_range_unlock(rl);
4278 4265 if ((flags & B_ASYNC) == 0 || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4279 4266 zil_commit(zfsvfs->z_log, zp->z_id);
4280 4267 ZFS_EXIT(zfsvfs);
4281 4268 return (error);
4282 4269 }
4283 4270
4284 4271 /*ARGSUSED*/
4285 4272 void
4286 4273 zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
4287 4274 {
4288 4275 znode_t *zp = VTOZ(vp);
4289 4276 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4290 4277 int error;
4291 4278
4292 4279 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
4293 4280 if (zp->z_sa_hdl == NULL) {
4294 4281 /*
4295 4282 * The fs has been unmounted, or we did a
4296 4283 * suspend/resume and this file no longer exists.
4297 4284 */
4298 4285 if (vn_has_cached_data(vp)) {
4299 4286 (void) pvn_vplist_dirty(vp, 0, zfs_null_putapage,
4300 4287 B_INVAL, cr);
4301 4288 }
4302 4289
4303 4290 mutex_enter(&zp->z_lock);
4304 4291 mutex_enter(&vp->v_lock);
4305 4292 ASSERT(vp->v_count == 1);
4306 4293 vp->v_count = 0;
4307 4294 mutex_exit(&vp->v_lock);
4308 4295 mutex_exit(&zp->z_lock);
4309 4296 rw_exit(&zfsvfs->z_teardown_inactive_lock);
4310 4297 zfs_znode_free(zp);
4311 4298 return;
4312 4299 }
4313 4300
4314 4301 /*
4315 4302 * Attempt to push any data in the page cache. If this fails
4316 4303 * we will get kicked out later in zfs_zinactive().
4317 4304 */
4318 4305 if (vn_has_cached_data(vp)) {
4319 4306 (void) pvn_vplist_dirty(vp, 0, zfs_putapage, B_INVAL|B_ASYNC,
4320 4307 cr);
4321 4308 }
4322 4309
4323 4310 if (zp->z_atime_dirty && zp->z_unlinked == 0) {
4324 4311 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);
4325 4312
4326 4313 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4327 4314 zfs_sa_upgrade_txholds(tx, zp);
4328 4315 error = dmu_tx_assign(tx, TXG_WAIT);
4329 4316 if (error) {
4330 4317 dmu_tx_abort(tx);
4331 4318 } else {
4332 4319 mutex_enter(&zp->z_lock);
4333 4320 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
4334 4321 (void *)&zp->z_atime, sizeof (zp->z_atime), tx);
4335 4322 zp->z_atime_dirty = 0;
4336 4323 mutex_exit(&zp->z_lock);
4337 4324 dmu_tx_commit(tx);
4338 4325 }
4339 4326 }
4340 4327
4341 4328 zfs_zinactive(zp);
4342 4329 rw_exit(&zfsvfs->z_teardown_inactive_lock);
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4343 4330 }
4344 4331
4345 4332 /*
4346 4333 * Bounds-check the seek operation.
4347 4334 *
4348 4335 * IN: vp - vnode seeking within
4349 4336 * ooff - old file offset
4350 4337 * noffp - pointer to new file offset
4351 4338 * ct - caller context
4352 4339 *
4353 - * RETURN: 0 if success
4354 - * EINVAL if new offset invalid
4340 + * RETURN: 0 on success, EINVAL if new offset invalid.
4355 4341 */
4356 4342 /* ARGSUSED */
4357 4343 static int
4358 4344 zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp,
4359 4345 caller_context_t *ct)
4360 4346 {
4361 4347 if (vp->v_type == VDIR)
4362 4348 return (0);
4363 4349 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
4364 4350 }
4365 4351
4366 4352 /*
4367 4353 * Pre-filter the generic locking function to trap attempts to place
4368 4354 * a mandatory lock on a memory mapped file.
4369 4355 */
4370 4356 static int
4371 4357 zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset,
4372 4358 flk_callback_t *flk_cbp, cred_t *cr, caller_context_t *ct)
4373 4359 {
4374 4360 znode_t *zp = VTOZ(vp);
4375 4361 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4376 4362
4377 4363 ZFS_ENTER(zfsvfs);
4378 4364 ZFS_VERIFY_ZP(zp);
4379 4365
4380 4366 /*
4381 4367 * We are following the UFS semantics with respect to mapcnt
4382 4368 * here: If we see that the file is mapped already, then we will
4383 4369 * return an error, but we don't worry about races between this
4384 4370 * function and zfs_map().
4385 4371 */
4386 4372 if (zp->z_mapcnt > 0 && MANDMODE(zp->z_mode)) {
4387 4373 ZFS_EXIT(zfsvfs);
4388 4374 return (SET_ERROR(EAGAIN));
4389 4375 }
4390 4376 ZFS_EXIT(zfsvfs);
4391 4377 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct));
4392 4378 }
4393 4379
4394 4380 /*
4395 4381 * If we can't find a page in the cache, we will create a new page
4396 4382 * and fill it with file data. For efficiency, we may try to fill
4397 4383 * multiple pages at once (klustering) to fill up the supplied page
4398 4384 * list. Note that the pages to be filled are held with an exclusive
4399 4385 * lock to prevent access by other threads while they are being filled.
4400 4386 */
4401 4387 static int
4402 4388 zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg,
4403 4389 caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw)
4404 4390 {
4405 4391 znode_t *zp = VTOZ(vp);
4406 4392 page_t *pp, *cur_pp;
4407 4393 objset_t *os = zp->z_zfsvfs->z_os;
4408 4394 u_offset_t io_off, total;
4409 4395 size_t io_len;
4410 4396 int err;
4411 4397
4412 4398 if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE) {
4413 4399 /*
4414 4400 * We only have a single page, don't bother klustering
4415 4401 */
4416 4402 io_off = off;
4417 4403 io_len = PAGESIZE;
4418 4404 pp = page_create_va(vp, io_off, io_len,
4419 4405 PG_EXCL | PG_WAIT, seg, addr);
4420 4406 } else {
4421 4407 /*
4422 4408 * Try to find enough pages to fill the page list
4423 4409 */
4424 4410 pp = pvn_read_kluster(vp, off, seg, addr, &io_off,
4425 4411 &io_len, off, plsz, 0);
4426 4412 }
4427 4413 if (pp == NULL) {
4428 4414 /*
4429 4415 * The page already exists, nothing to do here.
4430 4416 */
4431 4417 *pl = NULL;
4432 4418 return (0);
4433 4419 }
4434 4420
4435 4421 /*
4436 4422 * Fill the pages in the kluster.
4437 4423 */
4438 4424 cur_pp = pp;
4439 4425 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
4440 4426 caddr_t va;
4441 4427
4442 4428 ASSERT3U(io_off, ==, cur_pp->p_offset);
4443 4429 va = zfs_map_page(cur_pp, S_WRITE);
4444 4430 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
4445 4431 DMU_READ_PREFETCH);
4446 4432 zfs_unmap_page(cur_pp, va);
4447 4433 if (err) {
4448 4434 /* On error, toss the entire kluster */
4449 4435 pvn_read_done(pp, B_ERROR);
4450 4436 /* convert checksum errors into IO errors */
4451 4437 if (err == ECKSUM)
4452 4438 err = SET_ERROR(EIO);
4453 4439 return (err);
4454 4440 }
4455 4441 cur_pp = cur_pp->p_next;
4456 4442 }
4457 4443
4458 4444 /*
4459 4445 * Fill in the page list array from the kluster starting
4460 4446 * from the desired offset `off'.
4461 4447 * NOTE: the page list will always be null terminated.
4462 4448 */
4463 4449 pvn_plist_init(pp, pl, plsz, off, io_len, rw);
4464 4450 ASSERT(pl == NULL || (*pl)->p_offset == off);
4465 4451
4466 4452 return (0);
4467 4453 }
4468 4454
4469 4455 /*
4470 4456 * Return pointers to the pages for the file region [off, off + len]
4471 4457 * in the pl array. If plsz is greater than len, this function may
4472 4458 * also return page pointers from after the specified region
4473 4459 * (i.e. the region [off, off + plsz]). These additional pages are
4474 4460 * only returned if they are already in the cache, or were created as
4475 4461 * part of a klustered read.
4476 4462 *
4477 4463 * IN: vp - vnode of file to get data from.
4478 4464 * off - position in file to get data from.
4479 4465 * len - amount of data to retrieve.
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4480 4466 * plsz - length of provided page list.
4481 4467 * seg - segment to obtain pages for.
4482 4468 * addr - virtual address of fault.
4483 4469 * rw - mode of created pages.
4484 4470 * cr - credentials of caller.
4485 4471 * ct - caller context.
4486 4472 *
4487 4473 * OUT: protp - protection mode of created pages.
4488 4474 * pl - list of pages created.
4489 4475 *
4490 - * RETURN: 0 if success
4491 - * error code if failure
4476 + * RETURN: 0 on success, error code on failure.
4492 4477 *
4493 4478 * Timestamps:
4494 4479 * vp - atime updated
4495 4480 */
4496 4481 /* ARGSUSED */
4497 4482 static int
4498 4483 zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp,
4499 - page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr,
4500 - enum seg_rw rw, cred_t *cr, caller_context_t *ct)
4484 + page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr,
4485 + enum seg_rw rw, cred_t *cr, caller_context_t *ct)
4501 4486 {
4502 4487 znode_t *zp = VTOZ(vp);
4503 4488 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4504 4489 page_t **pl0 = pl;
4505 4490 int err = 0;
4506 4491
4507 4492 /* we do our own caching, faultahead is unnecessary */
4508 4493 if (pl == NULL)
4509 4494 return (0);
4510 4495 else if (len > plsz)
4511 4496 len = plsz;
4512 4497 else
4513 4498 len = P2ROUNDUP(len, PAGESIZE);
4514 4499 ASSERT(plsz >= len);
4515 4500
4516 4501 ZFS_ENTER(zfsvfs);
4517 4502 ZFS_VERIFY_ZP(zp);
4518 4503
4519 4504 if (protp)
4520 4505 *protp = PROT_ALL;
4521 4506
4522 4507 /*
4523 4508 * Loop through the requested range [off, off + len) looking
4524 4509 * for pages. If we don't find a page, we will need to create
4525 4510 * a new page and fill it with data from the file.
4526 4511 */
4527 4512 while (len > 0) {
4528 4513 if (*pl = page_lookup(vp, off, SE_SHARED))
4529 4514 *(pl+1) = NULL;
4530 4515 else if (err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw))
4531 4516 goto out;
4532 4517 while (*pl) {
4533 4518 ASSERT3U((*pl)->p_offset, ==, off);
4534 4519 off += PAGESIZE;
4535 4520 addr += PAGESIZE;
4536 4521 if (len > 0) {
4537 4522 ASSERT3U(len, >=, PAGESIZE);
4538 4523 len -= PAGESIZE;
4539 4524 }
4540 4525 ASSERT3U(plsz, >=, PAGESIZE);
4541 4526 plsz -= PAGESIZE;
4542 4527 pl++;
4543 4528 }
4544 4529 }
4545 4530
4546 4531 /*
4547 4532 * Fill out the page array with any pages already in the cache.
4548 4533 */
4549 4534 while (plsz > 0 &&
4550 4535 (*pl++ = page_lookup_nowait(vp, off, SE_SHARED))) {
4551 4536 off += PAGESIZE;
4552 4537 plsz -= PAGESIZE;
4553 4538 }
4554 4539 out:
4555 4540 if (err) {
4556 4541 /*
4557 4542 * Release any pages we have previously locked.
4558 4543 */
4559 4544 while (pl > pl0)
4560 4545 page_unlock(*--pl);
4561 4546 } else {
4562 4547 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
4563 4548 }
4564 4549
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4565 4550 *pl = NULL;
4566 4551
4567 4552 ZFS_EXIT(zfsvfs);
4568 4553 return (err);
4569 4554 }
4570 4555
4571 4556 /*
4572 4557 * Request a memory map for a section of a file. This code interacts
4573 4558 * with common code and the VM system as follows:
4574 4559 *
4575 - * common code calls mmap(), which ends up in smmap_common()
4576 - *
4577 - * this calls VOP_MAP(), which takes you into (say) zfs
4578 - *
4579 - * zfs_map() calls as_map(), passing segvn_create() as the callback
4580 - *
4581 - * segvn_create() creates the new segment and calls VOP_ADDMAP()
4582 - *
4583 - * zfs_addmap() updates z_mapcnt
4560 + * - common code calls mmap(), which ends up in smmap_common()
4561 + * - this calls VOP_MAP(), which takes you into (say) zfs
4562 + * - zfs_map() calls as_map(), passing segvn_create() as the callback
4563 + * - segvn_create() creates the new segment and calls VOP_ADDMAP()
4564 + * - zfs_addmap() updates z_mapcnt
4584 4565 */
4585 4566 /*ARGSUSED*/
4586 4567 static int
4587 4568 zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp,
4588 4569 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
4589 4570 caller_context_t *ct)
4590 4571 {
4591 4572 znode_t *zp = VTOZ(vp);
4592 4573 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4593 4574 segvn_crargs_t vn_a;
4594 4575 int error;
4595 4576
4596 4577 ZFS_ENTER(zfsvfs);
4597 4578 ZFS_VERIFY_ZP(zp);
4598 4579
4599 4580 if ((prot & PROT_WRITE) && (zp->z_pflags &
4600 4581 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
4601 4582 ZFS_EXIT(zfsvfs);
4602 4583 return (SET_ERROR(EPERM));
4603 4584 }
4604 4585
4605 4586 if ((prot & (PROT_READ | PROT_EXEC)) &&
4606 4587 (zp->z_pflags & ZFS_AV_QUARANTINED)) {
4607 4588 ZFS_EXIT(zfsvfs);
4608 4589 return (SET_ERROR(EACCES));
4609 4590 }
4610 4591
4611 4592 if (vp->v_flag & VNOMAP) {
4612 4593 ZFS_EXIT(zfsvfs);
4613 4594 return (SET_ERROR(ENOSYS));
4614 4595 }
4615 4596
4616 4597 if (off < 0 || len > MAXOFFSET_T - off) {
4617 4598 ZFS_EXIT(zfsvfs);
4618 4599 return (SET_ERROR(ENXIO));
4619 4600 }
4620 4601
4621 4602 if (vp->v_type != VREG) {
4622 4603 ZFS_EXIT(zfsvfs);
4623 4604 return (SET_ERROR(ENODEV));
4624 4605 }
4625 4606
4626 4607 /*
4627 4608 * If file is locked, disallow mapping.
4628 4609 */
4629 4610 if (MANDMODE(zp->z_mode) && vn_has_flocks(vp)) {
4630 4611 ZFS_EXIT(zfsvfs);
4631 4612 return (SET_ERROR(EAGAIN));
4632 4613 }
4633 4614
4634 4615 as_rangelock(as);
4635 4616 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags);
4636 4617 if (error != 0) {
4637 4618 as_rangeunlock(as);
4638 4619 ZFS_EXIT(zfsvfs);
4639 4620 return (error);
4640 4621 }
4641 4622
4642 4623 vn_a.vp = vp;
4643 4624 vn_a.offset = (u_offset_t)off;
4644 4625 vn_a.type = flags & MAP_TYPE;
4645 4626 vn_a.prot = prot;
4646 4627 vn_a.maxprot = maxprot;
4647 4628 vn_a.cred = cr;
4648 4629 vn_a.amp = NULL;
4649 4630 vn_a.flags = flags & ~MAP_TYPE;
4650 4631 vn_a.szc = 0;
4651 4632 vn_a.lgrp_mem_policy_flags = 0;
4652 4633
4653 4634 error = as_map(as, *addrp, len, segvn_create, &vn_a);
4654 4635
4655 4636 as_rangeunlock(as);
4656 4637 ZFS_EXIT(zfsvfs);
4657 4638 return (error);
4658 4639 }
4659 4640
4660 4641 /* ARGSUSED */
4661 4642 static int
4662 4643 zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
4663 4644 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
4664 4645 caller_context_t *ct)
4665 4646 {
4666 4647 uint64_t pages = btopr(len);
4667 4648
4668 4649 atomic_add_64(&VTOZ(vp)->z_mapcnt, pages);
4669 4650 return (0);
4670 4651 }
4671 4652
4672 4653 /*
4673 4654 * The reason we push dirty pages as part of zfs_delmap() is so that we get a
4674 4655 * more accurate mtime for the associated file. Since we don't have a way of
4675 4656 * detecting when the data was actually modified, we have to resort to
4676 4657 * heuristics. If an explicit msync() is done, then we mark the mtime when the
4677 4658 * last page is pushed. The problem occurs when the msync() call is omitted,
4678 4659 * which by far the most common case:
4679 4660 *
4680 4661 * open()
4681 4662 * mmap()
4682 4663 * <modify memory>
4683 4664 * munmap()
4684 4665 * close()
4685 4666 * <time lapse>
4686 4667 * putpage() via fsflush
4687 4668 *
4688 4669 * If we wait until fsflush to come along, we can have a modification time that
4689 4670 * is some arbitrary point in the future. In order to prevent this in the
4690 4671 * common case, we flush pages whenever a (MAP_SHARED, PROT_WRITE) mapping is
4691 4672 * torn down.
4692 4673 */
4693 4674 /* ARGSUSED */
4694 4675 static int
4695 4676 zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
4696 4677 size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr,
4697 4678 caller_context_t *ct)
4698 4679 {
4699 4680 uint64_t pages = btopr(len);
4700 4681
4701 4682 ASSERT3U(VTOZ(vp)->z_mapcnt, >=, pages);
4702 4683 atomic_add_64(&VTOZ(vp)->z_mapcnt, -pages);
4703 4684
4704 4685 if ((flags & MAP_SHARED) && (prot & PROT_WRITE) &&
4705 4686 vn_has_cached_data(vp))
4706 4687 (void) VOP_PUTPAGE(vp, off, len, B_ASYNC, cr, ct);
4707 4688
4708 4689 return (0);
4709 4690 }
4710 4691
4711 4692 /*
4712 4693 * Free or allocate space in a file. Currently, this function only
4713 4694 * supports the `F_FREESP' command. However, this command is somewhat
4714 4695 * misnamed, as its functionality includes the ability to allocate as
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4715 4696 * well as free space.
4716 4697 *
4717 4698 * IN: vp - vnode of file to free data in.
4718 4699 * cmd - action to take (only F_FREESP supported).
4719 4700 * bfp - section of file to free/alloc.
4720 4701 * flag - current file open mode flags.
4721 4702 * offset - current file offset.
4722 4703 * cr - credentials of caller [UNUSED].
4723 4704 * ct - caller context.
4724 4705 *
4725 - * RETURN: 0 if success
4726 - * error code if failure
4706 + * RETURN: 0 on success, error code on failure.
4727 4707 *
4728 4708 * Timestamps:
4729 4709 * vp - ctime|mtime updated
4730 4710 */
4731 4711 /* ARGSUSED */
4732 4712 static int
4733 4713 zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag,
4734 4714 offset_t offset, cred_t *cr, caller_context_t *ct)
4735 4715 {
4736 4716 znode_t *zp = VTOZ(vp);
4737 4717 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4738 4718 uint64_t off, len;
4739 4719 int error;
4740 4720
4741 4721 ZFS_ENTER(zfsvfs);
4742 4722 ZFS_VERIFY_ZP(zp);
4743 4723
4744 4724 if (cmd != F_FREESP) {
4745 4725 ZFS_EXIT(zfsvfs);
4746 4726 return (SET_ERROR(EINVAL));
4747 4727 }
4748 4728
4749 4729 if (error = convoff(vp, bfp, 0, offset)) {
4750 4730 ZFS_EXIT(zfsvfs);
4751 4731 return (error);
4752 4732 }
4753 4733
4754 4734 if (bfp->l_len < 0) {
4755 4735 ZFS_EXIT(zfsvfs);
4756 4736 return (SET_ERROR(EINVAL));
4757 4737 }
4758 4738
4759 4739 off = bfp->l_start;
4760 4740 len = bfp->l_len; /* 0 means from off to end of file */
4761 4741
4762 4742 error = zfs_freesp(zp, off, len, flag, TRUE);
4763 4743
4764 4744 ZFS_EXIT(zfsvfs);
4765 4745 return (error);
4766 4746 }
4767 4747
4768 4748 /*ARGSUSED*/
4769 4749 static int
4770 4750 zfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
4771 4751 {
4772 4752 znode_t *zp = VTOZ(vp);
4773 4753 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4774 4754 uint32_t gen;
4775 4755 uint64_t gen64;
4776 4756 uint64_t object = zp->z_id;
4777 4757 zfid_short_t *zfid;
4778 4758 int size, i, error;
4779 4759
4780 4760 ZFS_ENTER(zfsvfs);
4781 4761 ZFS_VERIFY_ZP(zp);
4782 4762
4783 4763 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
4784 4764 &gen64, sizeof (uint64_t))) != 0) {
4785 4765 ZFS_EXIT(zfsvfs);
4786 4766 return (error);
4787 4767 }
4788 4768
4789 4769 gen = (uint32_t)gen64;
4790 4770
4791 4771 size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN;
4792 4772 if (fidp->fid_len < size) {
4793 4773 fidp->fid_len = size;
4794 4774 ZFS_EXIT(zfsvfs);
4795 4775 return (SET_ERROR(ENOSPC));
4796 4776 }
4797 4777
4798 4778 zfid = (zfid_short_t *)fidp;
4799 4779
4800 4780 zfid->zf_len = size;
4801 4781
4802 4782 for (i = 0; i < sizeof (zfid->zf_object); i++)
4803 4783 zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
4804 4784
4805 4785 /* Must have a non-zero generation number to distinguish from .zfs */
4806 4786 if (gen == 0)
4807 4787 gen = 1;
4808 4788 for (i = 0; i < sizeof (zfid->zf_gen); i++)
4809 4789 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
4810 4790
4811 4791 if (size == LONG_FID_LEN) {
4812 4792 uint64_t objsetid = dmu_objset_id(zfsvfs->z_os);
4813 4793 zfid_long_t *zlfid;
4814 4794
4815 4795 zlfid = (zfid_long_t *)fidp;
4816 4796
4817 4797 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
4818 4798 zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i));
4819 4799
4820 4800 /* XXX - this should be the generation number for the objset */
4821 4801 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
4822 4802 zlfid->zf_setgen[i] = 0;
4823 4803 }
4824 4804
4825 4805 ZFS_EXIT(zfsvfs);
4826 4806 return (0);
4827 4807 }
4828 4808
4829 4809 static int
4830 4810 zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
4831 4811 caller_context_t *ct)
4832 4812 {
4833 4813 znode_t *zp, *xzp;
4834 4814 zfsvfs_t *zfsvfs;
4835 4815 zfs_dirlock_t *dl;
4836 4816 int error;
4837 4817
4838 4818 switch (cmd) {
4839 4819 case _PC_LINK_MAX:
4840 4820 *valp = ULONG_MAX;
4841 4821 return (0);
4842 4822
4843 4823 case _PC_FILESIZEBITS:
4844 4824 *valp = 64;
4845 4825 return (0);
4846 4826
4847 4827 case _PC_XATTR_EXISTS:
4848 4828 zp = VTOZ(vp);
4849 4829 zfsvfs = zp->z_zfsvfs;
4850 4830 ZFS_ENTER(zfsvfs);
4851 4831 ZFS_VERIFY_ZP(zp);
4852 4832 *valp = 0;
4853 4833 error = zfs_dirent_lock(&dl, zp, "", &xzp,
4854 4834 ZXATTR | ZEXISTS | ZSHARED, NULL, NULL);
4855 4835 if (error == 0) {
4856 4836 zfs_dirent_unlock(dl);
4857 4837 if (!zfs_dirempty(xzp))
4858 4838 *valp = 1;
4859 4839 VN_RELE(ZTOV(xzp));
4860 4840 } else if (error == ENOENT) {
4861 4841 /*
4862 4842 * If there aren't extended attributes, it's the
4863 4843 * same as having zero of them.
4864 4844 */
4865 4845 error = 0;
4866 4846 }
4867 4847 ZFS_EXIT(zfsvfs);
4868 4848 return (error);
4869 4849
4870 4850 case _PC_SATTR_ENABLED:
4871 4851 case _PC_SATTR_EXISTS:
4872 4852 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
4873 4853 (vp->v_type == VREG || vp->v_type == VDIR);
4874 4854 return (0);
4875 4855
4876 4856 case _PC_ACCESS_FILTERING:
4877 4857 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_ACCESS_FILTER) &&
4878 4858 vp->v_type == VDIR;
4879 4859 return (0);
4880 4860
4881 4861 case _PC_ACL_ENABLED:
4882 4862 *valp = _ACL_ACE_ENABLED;
4883 4863 return (0);
4884 4864
4885 4865 case _PC_MIN_HOLE_SIZE:
4886 4866 *valp = (ulong_t)SPA_MINBLOCKSIZE;
4887 4867 return (0);
4888 4868
4889 4869 case _PC_TIMESTAMP_RESOLUTION:
4890 4870 /* nanosecond timestamp resolution */
4891 4871 *valp = 1L;
4892 4872 return (0);
4893 4873
4894 4874 default:
4895 4875 return (fs_pathconf(vp, cmd, valp, cr, ct));
4896 4876 }
4897 4877 }
4898 4878
4899 4879 /*ARGSUSED*/
4900 4880 static int
4901 4881 zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr,
4902 4882 caller_context_t *ct)
4903 4883 {
4904 4884 znode_t *zp = VTOZ(vp);
4905 4885 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4906 4886 int error;
4907 4887 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
4908 4888
4909 4889 ZFS_ENTER(zfsvfs);
4910 4890 ZFS_VERIFY_ZP(zp);
4911 4891 error = zfs_getacl(zp, vsecp, skipaclchk, cr);
4912 4892 ZFS_EXIT(zfsvfs);
4913 4893
4914 4894 return (error);
4915 4895 }
4916 4896
4917 4897 /*ARGSUSED*/
4918 4898 static int
4919 4899 zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr,
4920 4900 caller_context_t *ct)
4921 4901 {
4922 4902 znode_t *zp = VTOZ(vp);
4923 4903 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4924 4904 int error;
4925 4905 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
4926 4906 zilog_t *zilog = zfsvfs->z_log;
4927 4907
4928 4908 ZFS_ENTER(zfsvfs);
4929 4909 ZFS_VERIFY_ZP(zp);
4930 4910
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4931 4911 error = zfs_setacl(zp, vsecp, skipaclchk, cr);
4932 4912
4933 4913 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4934 4914 zil_commit(zilog, 0);
4935 4915
4936 4916 ZFS_EXIT(zfsvfs);
4937 4917 return (error);
4938 4918 }
4939 4919
4940 4920 /*
4941 - * Tunable, both must be a power of 2.
4942 - *
4943 - * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4944 - * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4945 - * an arcbuf for a partial block read
4921 + * The smallest read we may consider to loan out an arcbuf.
4922 + * This must be a power of 2.
4946 4923 */
4947 4924 int zcr_blksz_min = (1 << 10); /* 1K */
4925 +/*
4926 + * If set to less than the file block size, allow loaning out of an
4927 + * arcbuf for a partial block read. This must be a power of 2.
4928 + */
4948 4929 int zcr_blksz_max = (1 << 17); /* 128K */
4949 4930
4950 4931 /*ARGSUSED*/
4951 4932 static int
4952 4933 zfs_reqzcbuf(vnode_t *vp, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr,
4953 4934 caller_context_t *ct)
4954 4935 {
4955 4936 znode_t *zp = VTOZ(vp);
4956 4937 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4957 4938 int max_blksz = zfsvfs->z_max_blksz;
4958 4939 uio_t *uio = &xuio->xu_uio;
4959 4940 ssize_t size = uio->uio_resid;
4960 4941 offset_t offset = uio->uio_loffset;
4961 4942 int blksz;
4962 4943 int fullblk, i;
4963 4944 arc_buf_t *abuf;
4964 4945 ssize_t maxsize;
4965 4946 int preamble, postamble;
4966 4947
4967 4948 if (xuio->xu_type != UIOTYPE_ZEROCOPY)
4968 4949 return (SET_ERROR(EINVAL));
4969 4950
4970 4951 ZFS_ENTER(zfsvfs);
4971 4952 ZFS_VERIFY_ZP(zp);
4972 4953 switch (ioflag) {
4973 4954 case UIO_WRITE:
4974 4955 /*
4975 4956 * Loan out an arc_buf for write if write size is bigger than
4976 4957 * max_blksz, and the file's block size is also max_blksz.
4977 4958 */
4978 4959 blksz = max_blksz;
4979 4960 if (size < blksz || zp->z_blksz != blksz) {
4980 4961 ZFS_EXIT(zfsvfs);
4981 4962 return (SET_ERROR(EINVAL));
4982 4963 }
4983 4964 /*
4984 4965 * Caller requests buffers for write before knowing where the
4985 4966 * write offset might be (e.g. NFS TCP write).
4986 4967 */
4987 4968 if (offset == -1) {
4988 4969 preamble = 0;
4989 4970 } else {
4990 4971 preamble = P2PHASE(offset, blksz);
4991 4972 if (preamble) {
4992 4973 preamble = blksz - preamble;
4993 4974 size -= preamble;
4994 4975 }
4995 4976 }
4996 4977
4997 4978 postamble = P2PHASE(size, blksz);
4998 4979 size -= postamble;
4999 4980
5000 4981 fullblk = size / blksz;
5001 4982 (void) dmu_xuio_init(xuio,
5002 4983 (preamble != 0) + fullblk + (postamble != 0));
5003 4984 DTRACE_PROBE3(zfs_reqzcbuf_align, int, preamble,
5004 4985 int, postamble, int,
5005 4986 (preamble != 0) + fullblk + (postamble != 0));
5006 4987
5007 4988 /*
5008 4989 * Have to fix iov base/len for partial buffers. They
5009 4990 * currently represent full arc_buf's.
5010 4991 */
5011 4992 if (preamble) {
5012 4993 /* data begins in the middle of the arc_buf */
5013 4994 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5014 4995 blksz);
5015 4996 ASSERT(abuf);
5016 4997 (void) dmu_xuio_add(xuio, abuf,
5017 4998 blksz - preamble, preamble);
5018 4999 }
5019 5000
5020 5001 for (i = 0; i < fullblk; i++) {
5021 5002 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5022 5003 blksz);
5023 5004 ASSERT(abuf);
5024 5005 (void) dmu_xuio_add(xuio, abuf, 0, blksz);
5025 5006 }
5026 5007
5027 5008 if (postamble) {
5028 5009 /* data ends in the middle of the arc_buf */
5029 5010 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5030 5011 blksz);
5031 5012 ASSERT(abuf);
5032 5013 (void) dmu_xuio_add(xuio, abuf, 0, postamble);
5033 5014 }
5034 5015 break;
5035 5016 case UIO_READ:
5036 5017 /*
5037 5018 * Loan out an arc_buf for read if the read size is larger than
5038 5019 * the current file block size. Block alignment is not
5039 5020 * considered. Partial arc_buf will be loaned out for read.
5040 5021 */
5041 5022 blksz = zp->z_blksz;
5042 5023 if (blksz < zcr_blksz_min)
5043 5024 blksz = zcr_blksz_min;
5044 5025 if (blksz > zcr_blksz_max)
5045 5026 blksz = zcr_blksz_max;
5046 5027 /* avoid potential complexity of dealing with it */
5047 5028 if (blksz > max_blksz) {
5048 5029 ZFS_EXIT(zfsvfs);
5049 5030 return (SET_ERROR(EINVAL));
5050 5031 }
5051 5032
5052 5033 maxsize = zp->z_size - uio->uio_loffset;
5053 5034 if (size > maxsize)
5054 5035 size = maxsize;
5055 5036
5056 5037 if (size < blksz || vn_has_cached_data(vp)) {
5057 5038 ZFS_EXIT(zfsvfs);
5058 5039 return (SET_ERROR(EINVAL));
5059 5040 }
5060 5041 break;
5061 5042 default:
5062 5043 ZFS_EXIT(zfsvfs);
5063 5044 return (SET_ERROR(EINVAL));
5064 5045 }
5065 5046
5066 5047 uio->uio_extflg = UIO_XUIO;
5067 5048 XUIO_XUZC_RW(xuio) = ioflag;
5068 5049 ZFS_EXIT(zfsvfs);
5069 5050 return (0);
5070 5051 }
5071 5052
5072 5053 /*ARGSUSED*/
5073 5054 static int
5074 5055 zfs_retzcbuf(vnode_t *vp, xuio_t *xuio, cred_t *cr, caller_context_t *ct)
5075 5056 {
5076 5057 int i;
5077 5058 arc_buf_t *abuf;
5078 5059 int ioflag = XUIO_XUZC_RW(xuio);
5079 5060
5080 5061 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY);
5081 5062
5082 5063 i = dmu_xuio_cnt(xuio);
5083 5064 while (i-- > 0) {
5084 5065 abuf = dmu_xuio_arcbuf(xuio, i);
5085 5066 /*
5086 5067 * if abuf == NULL, it must be a write buffer
5087 5068 * that has been returned in zfs_write().
5088 5069 */
5089 5070 if (abuf)
5090 5071 dmu_return_arcbuf(abuf);
5091 5072 ASSERT(abuf || ioflag == UIO_WRITE);
5092 5073 }
5093 5074
5094 5075 dmu_xuio_fini(xuio);
5095 5076 return (0);
5096 5077 }
5097 5078
5098 5079 /*
5099 5080 * Predeclare these here so that the compiler assumes that
5100 5081 * this is an "old style" function declaration that does
5101 5082 * not include arguments => we won't get type mismatch errors
5102 5083 * in the initializations that follow.
5103 5084 */
5104 5085 static int zfs_inval();
5105 5086 static int zfs_isdir();
5106 5087
5107 5088 static int
5108 5089 zfs_inval()
5109 5090 {
5110 5091 return (SET_ERROR(EINVAL));
5111 5092 }
5112 5093
5113 5094 static int
5114 5095 zfs_isdir()
5115 5096 {
5116 5097 return (SET_ERROR(EISDIR));
5117 5098 }
5118 5099 /*
5119 5100 * Directory vnode operations template
5120 5101 */
5121 5102 vnodeops_t *zfs_dvnodeops;
5122 5103 const fs_operation_def_t zfs_dvnodeops_template[] = {
5123 5104 VOPNAME_OPEN, { .vop_open = zfs_open },
5124 5105 VOPNAME_CLOSE, { .vop_close = zfs_close },
5125 5106 VOPNAME_READ, { .error = zfs_isdir },
5126 5107 VOPNAME_WRITE, { .error = zfs_isdir },
5127 5108 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
5128 5109 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5129 5110 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5130 5111 VOPNAME_ACCESS, { .vop_access = zfs_access },
5131 5112 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
5132 5113 VOPNAME_CREATE, { .vop_create = zfs_create },
5133 5114 VOPNAME_REMOVE, { .vop_remove = zfs_remove },
5134 5115 VOPNAME_LINK, { .vop_link = zfs_link },
5135 5116 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5136 5117 VOPNAME_MKDIR, { .vop_mkdir = zfs_mkdir },
5137 5118 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir },
5138 5119 VOPNAME_READDIR, { .vop_readdir = zfs_readdir },
5139 5120 VOPNAME_SYMLINK, { .vop_symlink = zfs_symlink },
5140 5121 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
5141 5122 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5142 5123 VOPNAME_FID, { .vop_fid = zfs_fid },
5143 5124 VOPNAME_SEEK, { .vop_seek = zfs_seek },
5144 5125 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5145 5126 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5146 5127 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5147 5128 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5148 5129 NULL, NULL
5149 5130 };
5150 5131
5151 5132 /*
5152 5133 * Regular file vnode operations template
5153 5134 */
5154 5135 vnodeops_t *zfs_fvnodeops;
5155 5136 const fs_operation_def_t zfs_fvnodeops_template[] = {
5156 5137 VOPNAME_OPEN, { .vop_open = zfs_open },
5157 5138 VOPNAME_CLOSE, { .vop_close = zfs_close },
5158 5139 VOPNAME_READ, { .vop_read = zfs_read },
5159 5140 VOPNAME_WRITE, { .vop_write = zfs_write },
5160 5141 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
5161 5142 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5162 5143 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5163 5144 VOPNAME_ACCESS, { .vop_access = zfs_access },
5164 5145 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
5165 5146 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5166 5147 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
5167 5148 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5168 5149 VOPNAME_FID, { .vop_fid = zfs_fid },
5169 5150 VOPNAME_SEEK, { .vop_seek = zfs_seek },
5170 5151 VOPNAME_FRLOCK, { .vop_frlock = zfs_frlock },
5171 5152 VOPNAME_SPACE, { .vop_space = zfs_space },
5172 5153 VOPNAME_GETPAGE, { .vop_getpage = zfs_getpage },
5173 5154 VOPNAME_PUTPAGE, { .vop_putpage = zfs_putpage },
5174 5155 VOPNAME_MAP, { .vop_map = zfs_map },
5175 5156 VOPNAME_ADDMAP, { .vop_addmap = zfs_addmap },
5176 5157 VOPNAME_DELMAP, { .vop_delmap = zfs_delmap },
5177 5158 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5178 5159 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5179 5160 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5180 5161 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5181 5162 VOPNAME_REQZCBUF, { .vop_reqzcbuf = zfs_reqzcbuf },
5182 5163 VOPNAME_RETZCBUF, { .vop_retzcbuf = zfs_retzcbuf },
5183 5164 NULL, NULL
5184 5165 };
5185 5166
5186 5167 /*
5187 5168 * Symbolic link vnode operations template
5188 5169 */
5189 5170 vnodeops_t *zfs_symvnodeops;
5190 5171 const fs_operation_def_t zfs_symvnodeops_template[] = {
5191 5172 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5192 5173 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5193 5174 VOPNAME_ACCESS, { .vop_access = zfs_access },
5194 5175 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5195 5176 VOPNAME_READLINK, { .vop_readlink = zfs_readlink },
5196 5177 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5197 5178 VOPNAME_FID, { .vop_fid = zfs_fid },
5198 5179 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5199 5180 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5200 5181 NULL, NULL
5201 5182 };
5202 5183
5203 5184 /*
5204 5185 * special share hidden files vnode operations template
5205 5186 */
5206 5187 vnodeops_t *zfs_sharevnodeops;
5207 5188 const fs_operation_def_t zfs_sharevnodeops_template[] = {
5208 5189 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5209 5190 VOPNAME_ACCESS, { .vop_access = zfs_access },
5210 5191 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
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5211 5192 VOPNAME_FID, { .vop_fid = zfs_fid },
5212 5193 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5213 5194 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5214 5195 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5215 5196 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5216 5197 NULL, NULL
5217 5198 };
5218 5199
5219 5200 /*
5220 5201 * Extended attribute directory vnode operations template
5221 - * This template is identical to the directory vnodes
5222 - * operation template except for restricted operations:
5223 - * VOP_MKDIR()
5224 - * VOP_SYMLINK()
5202 + *
5203 + * This template is identical to the directory vnodes
5204 + * operation template except for restricted operations:
5205 + * VOP_MKDIR()
5206 + * VOP_SYMLINK()
5207 + *
5225 5208 * Note that there are other restrictions embedded in:
5226 5209 * zfs_create() - restrict type to VREG
5227 5210 * zfs_link() - no links into/out of attribute space
5228 5211 * zfs_rename() - no moves into/out of attribute space
5229 5212 */
5230 5213 vnodeops_t *zfs_xdvnodeops;
5231 5214 const fs_operation_def_t zfs_xdvnodeops_template[] = {
5232 5215 VOPNAME_OPEN, { .vop_open = zfs_open },
5233 5216 VOPNAME_CLOSE, { .vop_close = zfs_close },
5234 5217 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
5235 5218 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5236 5219 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5237 5220 VOPNAME_ACCESS, { .vop_access = zfs_access },
5238 5221 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
5239 5222 VOPNAME_CREATE, { .vop_create = zfs_create },
5240 5223 VOPNAME_REMOVE, { .vop_remove = zfs_remove },
5241 5224 VOPNAME_LINK, { .vop_link = zfs_link },
5242 5225 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5243 5226 VOPNAME_MKDIR, { .error = zfs_inval },
5244 5227 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir },
5245 5228 VOPNAME_READDIR, { .vop_readdir = zfs_readdir },
5246 5229 VOPNAME_SYMLINK, { .error = zfs_inval },
5247 5230 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
5248 5231 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5249 5232 VOPNAME_FID, { .vop_fid = zfs_fid },
5250 5233 VOPNAME_SEEK, { .vop_seek = zfs_seek },
5251 5234 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5252 5235 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5253 5236 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5254 5237 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5255 5238 NULL, NULL
5256 5239 };
5257 5240
5258 5241 /*
5259 5242 * Error vnode operations template
5260 5243 */
5261 5244 vnodeops_t *zfs_evnodeops;
5262 5245 const fs_operation_def_t zfs_evnodeops_template[] = {
5263 5246 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5264 5247 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5265 5248 NULL, NULL
5266 5249 };
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