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e53d678d MM |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
24 | * Copyright (c) 2012, 2018 by Delphix. All rights reserved. | |
25 | * Copyright (c) 2015 by Chunwei Chen. All rights reserved. | |
26 | * Copyright 2017 Nexenta Systems, Inc. | |
27 | */ | |
28 | ||
29 | /* Portions Copyright 2007 Jeremy Teo */ | |
30 | /* Portions Copyright 2010 Robert Milkowski */ | |
31 | ||
32 | #include <sys/types.h> | |
33 | #include <sys/param.h> | |
34 | #include <sys/time.h> | |
35 | #include <sys/sysmacros.h> | |
36 | #include <sys/vfs.h> | |
37 | #include <sys/uio.h> | |
38 | #include <sys/file.h> | |
39 | #include <sys/stat.h> | |
40 | #include <sys/kmem.h> | |
41 | #include <sys/cmn_err.h> | |
42 | #include <sys/errno.h> | |
43 | #include <sys/zfs_dir.h> | |
44 | #include <sys/zfs_acl.h> | |
45 | #include <sys/zfs_ioctl.h> | |
46 | #include <sys/fs/zfs.h> | |
47 | #include <sys/dmu.h> | |
48 | #include <sys/dmu_objset.h> | |
49 | #include <sys/spa.h> | |
50 | #include <sys/txg.h> | |
51 | #include <sys/dbuf.h> | |
52 | #include <sys/policy.h> | |
53 | #include <sys/zfs_vnops.h> | |
54 | #include <sys/zfs_quota.h> | |
ab8c935e CS |
55 | #include <sys/zfs_vfsops.h> |
56 | #include <sys/zfs_znode.h> | |
e53d678d MM |
57 | |
58 | ||
59 | static ulong_t zfs_fsync_sync_cnt = 4; | |
60 | ||
61 | int | |
62 | zfs_fsync(znode_t *zp, int syncflag, cred_t *cr) | |
63 | { | |
64 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
65 | ||
66 | (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt); | |
67 | ||
68 | if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) { | |
69 | ZFS_ENTER(zfsvfs); | |
70 | ZFS_VERIFY_ZP(zp); | |
71 | zil_commit(zfsvfs->z_log, zp->z_id); | |
72 | ZFS_EXIT(zfsvfs); | |
73 | } | |
74 | tsd_set(zfs_fsyncer_key, NULL); | |
75 | ||
76 | return (0); | |
77 | } | |
78 | ||
8583540c MM |
79 | |
80 | #if defined(SEEK_HOLE) && defined(SEEK_DATA) | |
81 | /* | |
82 | * Lseek support for finding holes (cmd == SEEK_HOLE) and | |
83 | * data (cmd == SEEK_DATA). "off" is an in/out parameter. | |
84 | */ | |
85 | static int | |
86 | zfs_holey_common(znode_t *zp, ulong_t cmd, loff_t *off) | |
87 | { | |
88 | uint64_t noff = (uint64_t)*off; /* new offset */ | |
89 | uint64_t file_sz; | |
90 | int error; | |
91 | boolean_t hole; | |
92 | ||
93 | file_sz = zp->z_size; | |
94 | if (noff >= file_sz) { | |
95 | return (SET_ERROR(ENXIO)); | |
96 | } | |
97 | ||
98 | if (cmd == F_SEEK_HOLE) | |
99 | hole = B_TRUE; | |
100 | else | |
101 | hole = B_FALSE; | |
102 | ||
103 | error = dmu_offset_next(ZTOZSB(zp)->z_os, zp->z_id, hole, &noff); | |
104 | ||
105 | if (error == ESRCH) | |
106 | return (SET_ERROR(ENXIO)); | |
107 | ||
108 | /* file was dirty, so fall back to using generic logic */ | |
109 | if (error == EBUSY) { | |
110 | if (hole) | |
111 | *off = file_sz; | |
112 | ||
113 | return (0); | |
114 | } | |
115 | ||
116 | /* | |
117 | * We could find a hole that begins after the logical end-of-file, | |
118 | * because dmu_offset_next() only works on whole blocks. If the | |
119 | * EOF falls mid-block, then indicate that the "virtual hole" | |
120 | * at the end of the file begins at the logical EOF, rather than | |
121 | * at the end of the last block. | |
122 | */ | |
123 | if (noff > file_sz) { | |
124 | ASSERT(hole); | |
125 | noff = file_sz; | |
126 | } | |
127 | ||
128 | if (noff < *off) | |
129 | return (error); | |
130 | *off = noff; | |
131 | return (error); | |
132 | } | |
133 | ||
134 | int | |
135 | zfs_holey(znode_t *zp, ulong_t cmd, loff_t *off) | |
136 | { | |
137 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
138 | int error; | |
139 | ||
140 | ZFS_ENTER(zfsvfs); | |
141 | ZFS_VERIFY_ZP(zp); | |
142 | ||
143 | error = zfs_holey_common(zp, cmd, off); | |
144 | ||
145 | ZFS_EXIT(zfsvfs); | |
146 | return (error); | |
147 | } | |
148 | #endif /* SEEK_HOLE && SEEK_DATA */ | |
149 | ||
150 | /*ARGSUSED*/ | |
151 | int | |
152 | zfs_access(znode_t *zp, int mode, int flag, cred_t *cr) | |
153 | { | |
154 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
155 | int error; | |
156 | ||
157 | ZFS_ENTER(zfsvfs); | |
158 | ZFS_VERIFY_ZP(zp); | |
159 | ||
160 | if (flag & V_ACE_MASK) | |
161 | error = zfs_zaccess(zp, mode, flag, B_FALSE, cr); | |
162 | else | |
163 | error = zfs_zaccess_rwx(zp, mode, flag, cr); | |
164 | ||
165 | ZFS_EXIT(zfsvfs); | |
166 | return (error); | |
167 | } | |
168 | ||
e53d678d MM |
169 | static unsigned long zfs_vnops_read_chunk_size = 1024 * 1024; /* Tunable */ |
170 | ||
171 | /* | |
172 | * Read bytes from specified file into supplied buffer. | |
173 | * | |
174 | * IN: zp - inode of file to be read from. | |
175 | * uio - structure supplying read location, range info, | |
176 | * and return buffer. | |
177 | * ioflag - O_SYNC flags; used to provide FRSYNC semantics. | |
178 | * O_DIRECT flag; used to bypass page cache. | |
179 | * cr - credentials of caller. | |
180 | * | |
181 | * OUT: uio - updated offset and range, buffer filled. | |
182 | * | |
183 | * RETURN: 0 on success, error code on failure. | |
184 | * | |
185 | * Side Effects: | |
186 | * inode - atime updated if byte count > 0 | |
187 | */ | |
188 | /* ARGSUSED */ | |
189 | int | |
190 | zfs_read(struct znode *zp, uio_t *uio, int ioflag, cred_t *cr) | |
191 | { | |
192 | int error = 0; | |
193 | boolean_t frsync = B_FALSE; | |
194 | ||
195 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
196 | ZFS_ENTER(zfsvfs); | |
197 | ZFS_VERIFY_ZP(zp); | |
198 | ||
199 | if (zp->z_pflags & ZFS_AV_QUARANTINED) { | |
200 | ZFS_EXIT(zfsvfs); | |
201 | return (SET_ERROR(EACCES)); | |
202 | } | |
203 | ||
204 | /* We don't copy out anything useful for directories. */ | |
205 | if (Z_ISDIR(ZTOTYPE(zp))) { | |
206 | ZFS_EXIT(zfsvfs); | |
207 | return (SET_ERROR(EISDIR)); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Validate file offset | |
212 | */ | |
213 | if (uio->uio_loffset < (offset_t)0) { | |
214 | ZFS_EXIT(zfsvfs); | |
215 | return (SET_ERROR(EINVAL)); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Fasttrack empty reads | |
220 | */ | |
221 | if (uio->uio_resid == 0) { | |
222 | ZFS_EXIT(zfsvfs); | |
223 | return (0); | |
224 | } | |
225 | ||
226 | #ifdef FRSYNC | |
227 | /* | |
228 | * If we're in FRSYNC mode, sync out this znode before reading it. | |
229 | * Only do this for non-snapshots. | |
230 | * | |
231 | * Some platforms do not support FRSYNC and instead map it | |
232 | * to O_SYNC, which results in unnecessary calls to zil_commit. We | |
233 | * only honor FRSYNC requests on platforms which support it. | |
234 | */ | |
235 | frsync = !!(ioflag & FRSYNC); | |
236 | #endif | |
237 | if (zfsvfs->z_log && | |
238 | (frsync || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)) | |
239 | zil_commit(zfsvfs->z_log, zp->z_id); | |
240 | ||
241 | /* | |
242 | * Lock the range against changes. | |
243 | */ | |
244 | zfs_locked_range_t *lr = zfs_rangelock_enter(&zp->z_rangelock, | |
245 | uio->uio_loffset, uio->uio_resid, RL_READER); | |
246 | ||
247 | /* | |
248 | * If we are reading past end-of-file we can skip | |
249 | * to the end; but we might still need to set atime. | |
250 | */ | |
251 | if (uio->uio_loffset >= zp->z_size) { | |
252 | error = 0; | |
253 | goto out; | |
254 | } | |
255 | ||
256 | ASSERT(uio->uio_loffset < zp->z_size); | |
257 | ssize_t n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset); | |
258 | ssize_t start_resid = n; | |
259 | ||
260 | while (n > 0) { | |
261 | ssize_t nbytes = MIN(n, zfs_vnops_read_chunk_size - | |
262 | P2PHASE(uio->uio_loffset, zfs_vnops_read_chunk_size)); | |
263 | #ifdef UIO_NOCOPY | |
264 | if (uio->uio_segflg == UIO_NOCOPY) | |
265 | error = mappedread_sf(zp, nbytes, uio); | |
266 | else | |
267 | #endif | |
268 | if (zn_has_cached_data(zp) && !(ioflag & O_DIRECT)) { | |
269 | error = mappedread(zp, nbytes, uio); | |
270 | } else { | |
271 | error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl), | |
272 | uio, nbytes); | |
273 | } | |
274 | ||
275 | if (error) { | |
276 | /* convert checksum errors into IO errors */ | |
277 | if (error == ECKSUM) | |
278 | error = SET_ERROR(EIO); | |
279 | break; | |
280 | } | |
281 | ||
282 | n -= nbytes; | |
283 | } | |
284 | ||
285 | int64_t nread = start_resid - n; | |
286 | dataset_kstats_update_read_kstats(&zfsvfs->z_kstat, nread); | |
287 | task_io_account_read(nread); | |
288 | out: | |
289 | zfs_rangelock_exit(lr); | |
290 | ||
291 | ZFS_ACCESSTIME_STAMP(zfsvfs, zp); | |
292 | ZFS_EXIT(zfsvfs); | |
293 | return (error); | |
294 | } | |
295 | ||
296 | /* | |
297 | * Write the bytes to a file. | |
298 | * | |
299 | * IN: zp - znode of file to be written to. | |
300 | * uio - structure supplying write location, range info, | |
301 | * and data buffer. | |
302 | * ioflag - O_APPEND flag set if in append mode. | |
303 | * O_DIRECT flag; used to bypass page cache. | |
304 | * cr - credentials of caller. | |
305 | * | |
306 | * OUT: uio - updated offset and range. | |
307 | * | |
308 | * RETURN: 0 if success | |
309 | * error code if failure | |
310 | * | |
311 | * Timestamps: | |
312 | * ip - ctime|mtime updated if byte count > 0 | |
313 | */ | |
314 | ||
315 | /* ARGSUSED */ | |
316 | int | |
317 | zfs_write(znode_t *zp, uio_t *uio, int ioflag, cred_t *cr) | |
318 | { | |
319 | int error = 0; | |
320 | ssize_t start_resid = uio->uio_resid; | |
321 | ||
322 | /* | |
323 | * Fasttrack empty write | |
324 | */ | |
325 | ssize_t n = start_resid; | |
326 | if (n == 0) | |
327 | return (0); | |
328 | ||
329 | rlim64_t limit = MAXOFFSET_T; | |
330 | ||
331 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
332 | ZFS_ENTER(zfsvfs); | |
333 | ZFS_VERIFY_ZP(zp); | |
334 | ||
335 | sa_bulk_attr_t bulk[4]; | |
336 | int count = 0; | |
337 | uint64_t mtime[2], ctime[2]; | |
338 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); | |
339 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); | |
340 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, | |
341 | &zp->z_size, 8); | |
342 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, | |
343 | &zp->z_pflags, 8); | |
344 | ||
345 | /* | |
346 | * Callers might not be able to detect properly that we are read-only, | |
347 | * so check it explicitly here. | |
348 | */ | |
349 | if (zfs_is_readonly(zfsvfs)) { | |
350 | ZFS_EXIT(zfsvfs); | |
351 | return (SET_ERROR(EROFS)); | |
352 | } | |
353 | ||
354 | /* | |
355 | * If immutable or not appending then return EPERM | |
356 | */ | |
357 | if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) || | |
358 | ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & O_APPEND) && | |
359 | (uio->uio_loffset < zp->z_size))) { | |
360 | ZFS_EXIT(zfsvfs); | |
361 | return (SET_ERROR(EPERM)); | |
362 | } | |
363 | ||
364 | /* | |
365 | * Validate file offset | |
366 | */ | |
367 | offset_t woff = ioflag & O_APPEND ? zp->z_size : uio->uio_loffset; | |
368 | if (woff < 0) { | |
369 | ZFS_EXIT(zfsvfs); | |
370 | return (SET_ERROR(EINVAL)); | |
371 | } | |
372 | ||
373 | int max_blksz = zfsvfs->z_max_blksz; | |
374 | ||
375 | /* | |
376 | * Pre-fault the pages to ensure slow (eg NFS) pages | |
377 | * don't hold up txg. | |
378 | * Skip this if uio contains loaned arc_buf. | |
379 | */ | |
380 | if (uio_prefaultpages(MIN(n, max_blksz), uio)) { | |
381 | ZFS_EXIT(zfsvfs); | |
382 | return (SET_ERROR(EFAULT)); | |
383 | } | |
384 | ||
385 | /* | |
386 | * If in append mode, set the io offset pointer to eof. | |
387 | */ | |
388 | zfs_locked_range_t *lr; | |
389 | if (ioflag & O_APPEND) { | |
390 | /* | |
391 | * Obtain an appending range lock to guarantee file append | |
392 | * semantics. We reset the write offset once we have the lock. | |
393 | */ | |
394 | lr = zfs_rangelock_enter(&zp->z_rangelock, 0, n, RL_APPEND); | |
395 | woff = lr->lr_offset; | |
396 | if (lr->lr_length == UINT64_MAX) { | |
397 | /* | |
398 | * We overlocked the file because this write will cause | |
399 | * the file block size to increase. | |
400 | * Note that zp_size cannot change with this lock held. | |
401 | */ | |
402 | woff = zp->z_size; | |
403 | } | |
404 | uio->uio_loffset = woff; | |
405 | } else { | |
406 | /* | |
407 | * Note that if the file block size will change as a result of | |
408 | * this write, then this range lock will lock the entire file | |
409 | * so that we can re-write the block safely. | |
410 | */ | |
411 | lr = zfs_rangelock_enter(&zp->z_rangelock, woff, n, RL_WRITER); | |
412 | } | |
413 | ||
414 | if (zn_rlimit_fsize(zp, uio, uio->uio_td)) { | |
415 | zfs_rangelock_exit(lr); | |
416 | ZFS_EXIT(zfsvfs); | |
417 | return (EFBIG); | |
418 | } | |
419 | ||
420 | if (woff >= limit) { | |
421 | zfs_rangelock_exit(lr); | |
422 | ZFS_EXIT(zfsvfs); | |
423 | return (SET_ERROR(EFBIG)); | |
424 | } | |
425 | ||
426 | if ((woff + n) > limit || woff > (limit - n)) | |
427 | n = limit - woff; | |
428 | ||
429 | uint64_t end_size = MAX(zp->z_size, woff + n); | |
430 | zilog_t *zilog = zfsvfs->z_log; | |
431 | ||
eec6646e RM |
432 | const uint64_t uid = KUID_TO_SUID(ZTOUID(zp)); |
433 | const uint64_t gid = KGID_TO_SGID(ZTOGID(zp)); | |
434 | const uint64_t projid = zp->z_projid; | |
435 | ||
e53d678d MM |
436 | /* |
437 | * Write the file in reasonable size chunks. Each chunk is written | |
438 | * in a separate transaction; this keeps the intent log records small | |
439 | * and allows us to do more fine-grained space accounting. | |
440 | */ | |
441 | while (n > 0) { | |
442 | woff = uio->uio_loffset; | |
443 | ||
eec6646e RM |
444 | if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT, uid) || |
445 | zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT, gid) || | |
446 | (projid != ZFS_DEFAULT_PROJID && | |
e53d678d | 447 | zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT, |
eec6646e | 448 | projid))) { |
e53d678d MM |
449 | error = SET_ERROR(EDQUOT); |
450 | break; | |
451 | } | |
452 | ||
453 | arc_buf_t *abuf = NULL; | |
454 | if (n >= max_blksz && woff >= zp->z_size && | |
455 | P2PHASE(woff, max_blksz) == 0 && | |
456 | zp->z_blksz == max_blksz) { | |
457 | /* | |
458 | * This write covers a full block. "Borrow" a buffer | |
459 | * from the dmu so that we can fill it before we enter | |
460 | * a transaction. This avoids the possibility of | |
461 | * holding up the transaction if the data copy hangs | |
462 | * up on a pagefault (e.g., from an NFS server mapping). | |
463 | */ | |
464 | size_t cbytes; | |
465 | ||
466 | abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), | |
467 | max_blksz); | |
468 | ASSERT(abuf != NULL); | |
469 | ASSERT(arc_buf_size(abuf) == max_blksz); | |
470 | if ((error = uiocopy(abuf->b_data, max_blksz, | |
471 | UIO_WRITE, uio, &cbytes))) { | |
472 | dmu_return_arcbuf(abuf); | |
473 | break; | |
474 | } | |
475 | ASSERT(cbytes == max_blksz); | |
476 | } | |
477 | ||
478 | /* | |
479 | * Start a transaction. | |
480 | */ | |
481 | dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os); | |
482 | dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); | |
483 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)sa_get_db(zp->z_sa_hdl); | |
484 | DB_DNODE_ENTER(db); | |
485 | dmu_tx_hold_write_by_dnode(tx, DB_DNODE(db), woff, | |
486 | MIN(n, max_blksz)); | |
487 | DB_DNODE_EXIT(db); | |
488 | zfs_sa_upgrade_txholds(tx, zp); | |
489 | error = dmu_tx_assign(tx, TXG_WAIT); | |
490 | if (error) { | |
491 | dmu_tx_abort(tx); | |
492 | if (abuf != NULL) | |
493 | dmu_return_arcbuf(abuf); | |
494 | break; | |
495 | } | |
496 | ||
497 | /* | |
498 | * If rangelock_enter() over-locked we grow the blocksize | |
499 | * and then reduce the lock range. This will only happen | |
500 | * on the first iteration since rangelock_reduce() will | |
501 | * shrink down lr_length to the appropriate size. | |
502 | */ | |
503 | if (lr->lr_length == UINT64_MAX) { | |
504 | uint64_t new_blksz; | |
505 | ||
506 | if (zp->z_blksz > max_blksz) { | |
507 | /* | |
508 | * File's blocksize is already larger than the | |
509 | * "recordsize" property. Only let it grow to | |
510 | * the next power of 2. | |
511 | */ | |
512 | ASSERT(!ISP2(zp->z_blksz)); | |
513 | new_blksz = MIN(end_size, | |
514 | 1 << highbit64(zp->z_blksz)); | |
515 | } else { | |
516 | new_blksz = MIN(end_size, max_blksz); | |
517 | } | |
518 | zfs_grow_blocksize(zp, new_blksz, tx); | |
519 | zfs_rangelock_reduce(lr, woff, n); | |
520 | } | |
521 | ||
522 | /* | |
523 | * XXX - should we really limit each write to z_max_blksz? | |
524 | * Perhaps we should use SPA_MAXBLOCKSIZE chunks? | |
525 | */ | |
526 | ssize_t nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz)); | |
527 | ||
528 | ssize_t tx_bytes; | |
529 | if (abuf == NULL) { | |
530 | tx_bytes = uio->uio_resid; | |
531 | uio_fault_disable(uio, B_TRUE); | |
532 | error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl), | |
533 | uio, nbytes, tx); | |
534 | uio_fault_disable(uio, B_FALSE); | |
535 | #ifdef __linux__ | |
536 | if (error == EFAULT) { | |
537 | dmu_tx_commit(tx); | |
538 | /* | |
539 | * Account for partial writes before | |
540 | * continuing the loop. | |
541 | * Update needs to occur before the next | |
542 | * uio_prefaultpages, or prefaultpages may | |
543 | * error, and we may break the loop early. | |
544 | */ | |
545 | if (tx_bytes != uio->uio_resid) | |
546 | n -= tx_bytes - uio->uio_resid; | |
547 | if (uio_prefaultpages(MIN(n, max_blksz), uio)) { | |
548 | break; | |
549 | } | |
550 | continue; | |
551 | } | |
552 | #endif | |
553 | if (error != 0) { | |
554 | dmu_tx_commit(tx); | |
555 | break; | |
556 | } | |
557 | tx_bytes -= uio->uio_resid; | |
558 | } else { | |
559 | /* | |
560 | * Is this block ever reached? | |
561 | */ | |
562 | tx_bytes = nbytes; | |
563 | /* | |
564 | * If this is not a full block write, but we are | |
565 | * extending the file past EOF and this data starts | |
566 | * block-aligned, use assign_arcbuf(). Otherwise, | |
567 | * write via dmu_write(). | |
568 | */ | |
569 | ||
570 | if (tx_bytes == max_blksz) { | |
571 | error = dmu_assign_arcbuf_by_dbuf( | |
572 | sa_get_db(zp->z_sa_hdl), woff, abuf, tx); | |
573 | if (error != 0) { | |
574 | dmu_return_arcbuf(abuf); | |
575 | dmu_tx_commit(tx); | |
576 | break; | |
577 | } | |
578 | } | |
579 | ASSERT(tx_bytes <= uio->uio_resid); | |
580 | uioskip(uio, tx_bytes); | |
581 | } | |
582 | if (tx_bytes && zn_has_cached_data(zp) && | |
583 | !(ioflag & O_DIRECT)) { | |
8a9634e2 | 584 | update_pages(zp, woff, tx_bytes, zfsvfs->z_os); |
e53d678d MM |
585 | } |
586 | ||
587 | /* | |
588 | * If we made no progress, we're done. If we made even | |
589 | * partial progress, update the znode and ZIL accordingly. | |
590 | */ | |
591 | if (tx_bytes == 0) { | |
592 | (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs), | |
593 | (void *)&zp->z_size, sizeof (uint64_t), tx); | |
594 | dmu_tx_commit(tx); | |
595 | ASSERT(error != 0); | |
596 | break; | |
597 | } | |
598 | ||
599 | /* | |
600 | * Clear Set-UID/Set-GID bits on successful write if not | |
601 | * privileged and at least one of the execute bits is set. | |
602 | * | |
603 | * It would be nice to do this after all writes have | |
604 | * been done, but that would still expose the ISUID/ISGID | |
605 | * to another app after the partial write is committed. | |
606 | * | |
607 | * Note: we don't call zfs_fuid_map_id() here because | |
608 | * user 0 is not an ephemeral uid. | |
609 | */ | |
610 | mutex_enter(&zp->z_acl_lock); | |
e53d678d MM |
611 | if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) | |
612 | (S_IXUSR >> 6))) != 0 && | |
613 | (zp->z_mode & (S_ISUID | S_ISGID)) != 0 && | |
614 | secpolicy_vnode_setid_retain(zp, cr, | |
615 | ((zp->z_mode & S_ISUID) != 0 && uid == 0)) != 0) { | |
616 | uint64_t newmode; | |
617 | zp->z_mode &= ~(S_ISUID | S_ISGID); | |
618 | (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), | |
619 | (void *)&newmode, sizeof (uint64_t), tx); | |
620 | } | |
621 | mutex_exit(&zp->z_acl_lock); | |
622 | ||
623 | zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime); | |
624 | ||
625 | /* | |
626 | * Update the file size (zp_size) if it has changed; | |
627 | * account for possible concurrent updates. | |
628 | */ | |
629 | while ((end_size = zp->z_size) < uio->uio_loffset) { | |
630 | (void) atomic_cas_64(&zp->z_size, end_size, | |
631 | uio->uio_loffset); | |
632 | ASSERT(error == 0); | |
633 | } | |
634 | /* | |
635 | * If we are replaying and eof is non zero then force | |
636 | * the file size to the specified eof. Note, there's no | |
637 | * concurrency during replay. | |
638 | */ | |
639 | if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0) | |
640 | zp->z_size = zfsvfs->z_replay_eof; | |
641 | ||
642 | error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); | |
643 | ||
644 | zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag, | |
645 | NULL, NULL); | |
646 | dmu_tx_commit(tx); | |
647 | ||
648 | if (error != 0) | |
649 | break; | |
650 | ASSERT(tx_bytes == nbytes); | |
651 | n -= nbytes; | |
652 | ||
653 | if (n > 0) { | |
654 | if (uio_prefaultpages(MIN(n, max_blksz), uio)) { | |
655 | error = EFAULT; | |
656 | break; | |
657 | } | |
658 | } | |
659 | } | |
660 | ||
661 | zfs_inode_update(zp); | |
662 | zfs_rangelock_exit(lr); | |
663 | ||
664 | /* | |
665 | * If we're in replay mode, or we made no progress, return error. | |
666 | * Otherwise, it's at least a partial write, so it's successful. | |
667 | */ | |
668 | if (zfsvfs->z_replay || uio->uio_resid == start_resid) { | |
669 | ZFS_EXIT(zfsvfs); | |
670 | return (error); | |
671 | } | |
672 | ||
673 | if (ioflag & (O_SYNC | O_DSYNC) || | |
674 | zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) | |
675 | zil_commit(zilog, zp->z_id); | |
676 | ||
677 | int64_t nwritten = start_resid - uio->uio_resid; | |
678 | dataset_kstats_update_write_kstats(&zfsvfs->z_kstat, nwritten); | |
679 | task_io_account_write(nwritten); | |
680 | ||
681 | ZFS_EXIT(zfsvfs); | |
682 | return (0); | |
683 | } | |
684 | ||
685 | /*ARGSUSED*/ | |
686 | int | |
687 | zfs_getsecattr(znode_t *zp, vsecattr_t *vsecp, int flag, cred_t *cr) | |
688 | { | |
689 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
690 | int error; | |
691 | boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; | |
692 | ||
693 | ZFS_ENTER(zfsvfs); | |
694 | ZFS_VERIFY_ZP(zp); | |
695 | error = zfs_getacl(zp, vsecp, skipaclchk, cr); | |
696 | ZFS_EXIT(zfsvfs); | |
697 | ||
698 | return (error); | |
699 | } | |
700 | ||
701 | /*ARGSUSED*/ | |
702 | int | |
703 | zfs_setsecattr(znode_t *zp, vsecattr_t *vsecp, int flag, cred_t *cr) | |
704 | { | |
705 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
706 | int error; | |
707 | boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; | |
708 | zilog_t *zilog = zfsvfs->z_log; | |
709 | ||
710 | ZFS_ENTER(zfsvfs); | |
711 | ZFS_VERIFY_ZP(zp); | |
712 | ||
713 | error = zfs_setacl(zp, vsecp, skipaclchk, cr); | |
714 | ||
715 | if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) | |
716 | zil_commit(zilog, 0); | |
717 | ||
718 | ZFS_EXIT(zfsvfs); | |
719 | return (error); | |
720 | } | |
721 | ||
ab8c935e CS |
722 | #ifdef ZFS_DEBUG |
723 | static int zil_fault_io = 0; | |
724 | #endif | |
725 | ||
726 | static void zfs_get_done(zgd_t *zgd, int error); | |
727 | ||
728 | /* | |
729 | * Get data to generate a TX_WRITE intent log record. | |
730 | */ | |
731 | int | |
732 | zfs_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) | |
733 | { | |
734 | zfsvfs_t *zfsvfs = arg; | |
735 | objset_t *os = zfsvfs->z_os; | |
736 | znode_t *zp; | |
737 | uint64_t object = lr->lr_foid; | |
738 | uint64_t offset = lr->lr_offset; | |
739 | uint64_t size = lr->lr_length; | |
740 | dmu_buf_t *db; | |
741 | zgd_t *zgd; | |
742 | int error = 0; | |
743 | ||
744 | ASSERT3P(lwb, !=, NULL); | |
745 | ASSERT3P(zio, !=, NULL); | |
746 | ASSERT3U(size, !=, 0); | |
747 | ||
748 | /* | |
749 | * Nothing to do if the file has been removed | |
750 | */ | |
751 | if (zfs_zget(zfsvfs, object, &zp) != 0) | |
752 | return (SET_ERROR(ENOENT)); | |
753 | if (zp->z_unlinked) { | |
754 | /* | |
755 | * Release the vnode asynchronously as we currently have the | |
756 | * txg stopped from syncing. | |
757 | */ | |
758 | zfs_zrele_async(zp); | |
759 | return (SET_ERROR(ENOENT)); | |
760 | } | |
761 | ||
762 | zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); | |
763 | zgd->zgd_lwb = lwb; | |
764 | zgd->zgd_private = zp; | |
765 | ||
766 | /* | |
767 | * Write records come in two flavors: immediate and indirect. | |
768 | * For small writes it's cheaper to store the data with the | |
769 | * log record (immediate); for large writes it's cheaper to | |
770 | * sync the data and get a pointer to it (indirect) so that | |
771 | * we don't have to write the data twice. | |
772 | */ | |
773 | if (buf != NULL) { /* immediate write */ | |
774 | zgd->zgd_lr = zfs_rangelock_enter(&zp->z_rangelock, | |
775 | offset, size, RL_READER); | |
776 | /* test for truncation needs to be done while range locked */ | |
777 | if (offset >= zp->z_size) { | |
778 | error = SET_ERROR(ENOENT); | |
779 | } else { | |
780 | error = dmu_read(os, object, offset, size, buf, | |
781 | DMU_READ_NO_PREFETCH); | |
782 | } | |
783 | ASSERT(error == 0 || error == ENOENT); | |
784 | } else { /* indirect write */ | |
785 | /* | |
786 | * Have to lock the whole block to ensure when it's | |
787 | * written out and its checksum is being calculated | |
788 | * that no one can change the data. We need to re-check | |
789 | * blocksize after we get the lock in case it's changed! | |
790 | */ | |
791 | for (;;) { | |
792 | uint64_t blkoff; | |
793 | size = zp->z_blksz; | |
794 | blkoff = ISP2(size) ? P2PHASE(offset, size) : offset; | |
795 | offset -= blkoff; | |
796 | zgd->zgd_lr = zfs_rangelock_enter(&zp->z_rangelock, | |
797 | offset, size, RL_READER); | |
798 | if (zp->z_blksz == size) | |
799 | break; | |
800 | offset += blkoff; | |
801 | zfs_rangelock_exit(zgd->zgd_lr); | |
802 | } | |
803 | /* test for truncation needs to be done while range locked */ | |
804 | if (lr->lr_offset >= zp->z_size) | |
805 | error = SET_ERROR(ENOENT); | |
806 | #ifdef ZFS_DEBUG | |
807 | if (zil_fault_io) { | |
808 | error = SET_ERROR(EIO); | |
809 | zil_fault_io = 0; | |
810 | } | |
811 | #endif | |
812 | if (error == 0) | |
813 | error = dmu_buf_hold(os, object, offset, zgd, &db, | |
814 | DMU_READ_NO_PREFETCH); | |
815 | ||
816 | if (error == 0) { | |
817 | blkptr_t *bp = &lr->lr_blkptr; | |
818 | ||
819 | zgd->zgd_db = db; | |
820 | zgd->zgd_bp = bp; | |
821 | ||
822 | ASSERT(db->db_offset == offset); | |
823 | ASSERT(db->db_size == size); | |
824 | ||
825 | error = dmu_sync(zio, lr->lr_common.lrc_txg, | |
826 | zfs_get_done, zgd); | |
827 | ASSERT(error || lr->lr_length <= size); | |
828 | ||
829 | /* | |
830 | * On success, we need to wait for the write I/O | |
831 | * initiated by dmu_sync() to complete before we can | |
832 | * release this dbuf. We will finish everything up | |
833 | * in the zfs_get_done() callback. | |
834 | */ | |
835 | if (error == 0) | |
836 | return (0); | |
837 | ||
838 | if (error == EALREADY) { | |
839 | lr->lr_common.lrc_txtype = TX_WRITE2; | |
840 | /* | |
841 | * TX_WRITE2 relies on the data previously | |
842 | * written by the TX_WRITE that caused | |
843 | * EALREADY. We zero out the BP because | |
844 | * it is the old, currently-on-disk BP. | |
845 | */ | |
846 | zgd->zgd_bp = NULL; | |
847 | BP_ZERO(bp); | |
848 | error = 0; | |
849 | } | |
850 | } | |
851 | } | |
852 | ||
853 | zfs_get_done(zgd, error); | |
854 | ||
855 | return (error); | |
856 | } | |
857 | ||
858 | ||
859 | /* ARGSUSED */ | |
860 | static void | |
861 | zfs_get_done(zgd_t *zgd, int error) | |
862 | { | |
863 | znode_t *zp = zgd->zgd_private; | |
864 | ||
865 | if (zgd->zgd_db) | |
866 | dmu_buf_rele(zgd->zgd_db, zgd); | |
867 | ||
868 | zfs_rangelock_exit(zgd->zgd_lr); | |
869 | ||
870 | /* | |
871 | * Release the vnode asynchronously as we currently have the | |
872 | * txg stopped from syncing. | |
873 | */ | |
874 | zfs_zrele_async(zp); | |
875 | ||
876 | kmem_free(zgd, sizeof (zgd_t)); | |
877 | } | |
878 | ||
8583540c | 879 | EXPORT_SYMBOL(zfs_access); |
e53d678d | 880 | EXPORT_SYMBOL(zfs_fsync); |
8583540c | 881 | EXPORT_SYMBOL(zfs_holey); |
e53d678d MM |
882 | EXPORT_SYMBOL(zfs_read); |
883 | EXPORT_SYMBOL(zfs_write); | |
884 | EXPORT_SYMBOL(zfs_getsecattr); | |
885 | EXPORT_SYMBOL(zfs_setsecattr); | |
886 | ||
887 | ZFS_MODULE_PARAM(zfs_vnops, zfs_vnops_, read_chunk_size, ULONG, ZMOD_RW, | |
888 | "Bytes to read per chunk"); |