Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 : * Copyright (c) 2016-2018 Christoph Hellwig.
5 : * All Rights Reserved.
6 : */
7 : #include "xfs.h"
8 : #include "xfs_fs.h"
9 : #include "xfs_shared.h"
10 : #include "xfs_format.h"
11 : #include "xfs_log_format.h"
12 : #include "xfs_trans_resv.h"
13 : #include "xfs_mount.h"
14 : #include "xfs_inode.h"
15 : #include "xfs_btree.h"
16 : #include "xfs_bmap_btree.h"
17 : #include "xfs_bmap.h"
18 : #include "xfs_bmap_util.h"
19 : #include "xfs_errortag.h"
20 : #include "xfs_error.h"
21 : #include "xfs_trans.h"
22 : #include "xfs_trans_space.h"
23 : #include "xfs_inode_item.h"
24 : #include "xfs_iomap.h"
25 : #include "xfs_trace.h"
26 : #include "xfs_quota.h"
27 : #include "xfs_dquot_item.h"
28 : #include "xfs_dquot.h"
29 : #include "xfs_reflink.h"
30 : #include "xfs_health.h"
31 :
32 : #define XFS_ALLOC_ALIGN(mp, off) \
33 : (((off) >> mp->m_allocsize_log) << mp->m_allocsize_log)
34 :
35 : static int
36 0 : xfs_alert_fsblock_zero(
37 : xfs_inode_t *ip,
38 : xfs_bmbt_irec_t *imap)
39 : {
40 0 : xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
41 : "Access to block zero in inode %llu "
42 : "start_block: %llx start_off: %llx "
43 : "blkcnt: %llx extent-state: %x",
44 : (unsigned long long)ip->i_ino,
45 : (unsigned long long)imap->br_startblock,
46 : (unsigned long long)imap->br_startoff,
47 : (unsigned long long)imap->br_blockcount,
48 : imap->br_state);
49 0 : xfs_bmap_mark_sick(ip, XFS_DATA_FORK);
50 0 : return -EFSCORRUPTED;
51 : }
52 :
53 : u64
54 591373337 : xfs_iomap_inode_sequence(
55 : struct xfs_inode *ip,
56 : u16 iomap_flags)
57 : {
58 690021568 : u64 cookie = 0;
59 :
60 591373337 : if (iomap_flags & IOMAP_F_XATTR)
61 0 : return READ_ONCE(ip->i_af.if_seq);
62 591373337 : if ((iomap_flags & IOMAP_F_SHARED) && ip->i_cowfp)
63 5696365 : cookie = (u64)READ_ONCE(ip->i_cowfp->if_seq) << 32;
64 591373337 : return cookie | READ_ONCE(ip->i_df.if_seq);
65 : }
66 :
67 : /*
68 : * Check that the iomap passed to us is still valid for the given offset and
69 : * length.
70 : */
71 : static bool
72 178955637 : xfs_iomap_valid(
73 : struct inode *inode,
74 : const struct iomap *iomap)
75 : {
76 178955637 : struct xfs_inode *ip = XFS_I(inode);
77 :
78 178853103 : if (iomap->validity_cookie !=
79 178955637 : xfs_iomap_inode_sequence(ip, iomap->flags)) {
80 11773 : trace_xfs_iomap_invalid(ip, iomap);
81 11773 : return false;
82 : }
83 :
84 178844330 : XFS_ERRORTAG_DELAY(ip->i_mount, XFS_ERRTAG_WRITE_DELAY_MS);
85 : return true;
86 : }
87 :
88 : static const struct iomap_folio_ops xfs_iomap_folio_ops = {
89 : .iomap_valid = xfs_iomap_valid,
90 : };
91 :
92 : int
93 560859197 : xfs_bmbt_to_iomap(
94 : struct xfs_inode *ip,
95 : struct iomap *iomap,
96 : struct xfs_bmbt_irec *imap,
97 : unsigned int mapping_flags,
98 : u16 iomap_flags,
99 : u64 sequence_cookie)
100 : {
101 560859197 : struct xfs_mount *mp = ip->i_mount;
102 560859197 : struct xfs_buftarg *target = xfs_inode_buftarg(ip);
103 :
104 560859197 : if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock))) {
105 0 : xfs_bmap_mark_sick(ip, XFS_DATA_FORK);
106 0 : return xfs_alert_fsblock_zero(ip, imap);
107 : }
108 :
109 560859197 : if (imap->br_startblock == HOLESTARTBLOCK) {
110 320105976 : iomap->addr = IOMAP_NULL_ADDR;
111 320105976 : iomap->type = IOMAP_HOLE;
112 240753221 : } else if (imap->br_startblock == DELAYSTARTBLOCK ||
113 : isnullstartblock(imap->br_startblock)) {
114 60482088 : iomap->addr = IOMAP_NULL_ADDR;
115 60482088 : iomap->type = IOMAP_DELALLOC;
116 : } else {
117 180271133 : iomap->addr = BBTOB(xfs_fsb_to_db(ip, imap->br_startblock));
118 180271905 : if (mapping_flags & IOMAP_DAX)
119 : iomap->addr += target->bt_dax_part_off;
120 :
121 180271905 : if (imap->br_state == XFS_EXT_UNWRITTEN)
122 94897618 : iomap->type = IOMAP_UNWRITTEN;
123 : else
124 85374287 : iomap->type = IOMAP_MAPPED;
125 :
126 : }
127 560859969 : iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
128 560859969 : iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
129 560859969 : if (mapping_flags & IOMAP_DAX)
130 : iomap->dax_dev = target->bt_daxdev;
131 : else
132 560859969 : iomap->bdev = xfs_buftarg_bdev(target);
133 560859969 : iomap->flags = iomap_flags;
134 :
135 560859969 : if (xfs_ipincount(ip) &&
136 199775974 : (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
137 166960036 : iomap->flags |= IOMAP_F_DIRTY;
138 :
139 560859969 : iomap->validity_cookie = sequence_cookie;
140 560859969 : iomap->folio_ops = &xfs_iomap_folio_ops;
141 560859969 : return 0;
142 : }
143 :
144 : static void
145 19663829 : xfs_hole_to_iomap(
146 : struct xfs_inode *ip,
147 : struct iomap *iomap,
148 : xfs_fileoff_t offset_fsb,
149 : xfs_fileoff_t end_fsb)
150 : {
151 19663829 : struct xfs_buftarg *target = xfs_inode_buftarg(ip);
152 :
153 19663829 : iomap->addr = IOMAP_NULL_ADDR;
154 19663829 : iomap->type = IOMAP_HOLE;
155 19663829 : iomap->offset = XFS_FSB_TO_B(ip->i_mount, offset_fsb);
156 19663829 : iomap->length = XFS_FSB_TO_B(ip->i_mount, end_fsb - offset_fsb);
157 19663829 : iomap->bdev = xfs_buftarg_bdev(target);
158 19663829 : iomap->dax_dev = target->bt_daxdev;
159 19663829 : }
160 :
161 : static inline xfs_fileoff_t
162 585939850 : xfs_iomap_end_fsb(
163 : struct xfs_mount *mp,
164 : loff_t offset,
165 : loff_t count)
166 : {
167 585939850 : ASSERT(offset <= mp->m_super->s_maxbytes);
168 585939850 : return min(XFS_B_TO_FSB(mp, offset + count),
169 : XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
170 : }
171 :
172 : static xfs_extlen_t
173 13791787 : xfs_eof_alignment(
174 : struct xfs_inode *ip)
175 : {
176 13791787 : struct xfs_mount *mp = ip->i_mount;
177 13791787 : xfs_extlen_t align = 0;
178 :
179 13791787 : if (!XFS_IS_REALTIME_INODE(ip)) {
180 : /*
181 : * Round up the allocation request to a stripe unit
182 : * (m_dalign) boundary if the file size is >= stripe unit
183 : * size, and we are allocating past the allocation eof.
184 : *
185 : * If mounted with the "-o swalloc" option the alignment is
186 : * increased from the strip unit size to the stripe width.
187 : */
188 7963011 : if (mp->m_swidth && xfs_has_swalloc(mp))
189 0 : align = mp->m_swidth;
190 7963011 : else if (mp->m_dalign)
191 9658 : align = mp->m_dalign;
192 :
193 19316 : if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align))
194 2625 : align = 0;
195 : }
196 :
197 13791787 : return align;
198 : }
199 :
200 : /*
201 : * Check if last_fsb is outside the last extent, and if so grow it to the next
202 : * stripe unit boundary.
203 : */
204 : xfs_fileoff_t
205 9930693 : xfs_iomap_eof_align_last_fsb(
206 : struct xfs_inode *ip,
207 : xfs_fileoff_t end_fsb)
208 : {
209 9930693 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
210 9930693 : xfs_extlen_t extsz = xfs_get_extsz_hint(ip);
211 9930647 : xfs_extlen_t align = xfs_eof_alignment(ip);
212 9930647 : struct xfs_bmbt_irec irec;
213 9930647 : struct xfs_iext_cursor icur;
214 :
215 9930647 : ASSERT(!xfs_need_iread_extents(ifp));
216 :
217 : /*
218 : * Always round up the allocation request to the extent hint boundary.
219 : */
220 9930636 : if (extsz) {
221 8925584 : if (align)
222 0 : align = roundup_64(align, extsz);
223 : else
224 : align = extsz;
225 : }
226 :
227 9930636 : if (align) {
228 8926382 : xfs_fileoff_t aligned_end_fsb = roundup_64(end_fsb, align);
229 :
230 8926382 : xfs_iext_last(ifp, &icur);
231 8926377 : if (!xfs_iext_get_extent(ifp, &icur, &irec) ||
232 7834507 : aligned_end_fsb >= irec.br_startoff + irec.br_blockcount)
233 8755604 : return aligned_end_fsb;
234 : }
235 :
236 : return end_fsb;
237 : }
238 :
239 : int
240 21360627 : xfs_iomap_write_direct(
241 : struct xfs_inode *ip,
242 : xfs_fileoff_t offset_fsb,
243 : xfs_fileoff_t count_fsb,
244 : unsigned int flags,
245 : struct xfs_bmbt_irec *imap,
246 : u64 *seq)
247 : {
248 21360627 : struct xfs_mount *mp = ip->i_mount;
249 21360627 : struct xfs_trans *tp;
250 21360627 : xfs_filblks_t resaligned;
251 21360627 : int nimaps;
252 21360627 : unsigned int dblocks, rblocks;
253 21360627 : bool force = false;
254 21360627 : int error;
255 21360627 : int bmapi_flags = XFS_BMAPI_PREALLOC;
256 21360627 : int nr_exts = XFS_IEXT_ADD_NOSPLIT_CNT;
257 :
258 21360627 : ASSERT(count_fsb > 0);
259 :
260 21360627 : resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb,
261 : xfs_get_extsz_hint(ip));
262 21360693 : if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
263 16413450 : dblocks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
264 16413450 : rblocks = resaligned;
265 : } else {
266 4947243 : dblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
267 4947243 : rblocks = 0;
268 : }
269 :
270 21360693 : error = xfs_qm_dqattach(ip);
271 21360588 : if (error)
272 : return error;
273 :
274 : /*
275 : * For DAX, we do not allocate unwritten extents, but instead we zero
276 : * the block before we commit the transaction. Ideally we'd like to do
277 : * this outside the transaction context, but if we commit and then crash
278 : * we may not have zeroed the blocks and this will be exposed on
279 : * recovery of the allocation. Hence we must zero before commit.
280 : *
281 : * Further, if we are mapping unwritten extents here, we need to zero
282 : * and convert them to written so that we don't need an unwritten extent
283 : * callback for DAX. This also means that we need to be able to dip into
284 : * the reserve block pool for bmbt block allocation if there is no space
285 : * left but we need to do unwritten extent conversion.
286 : */
287 21360581 : if (flags & IOMAP_DAX) {
288 : bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO;
289 : if (imap->br_state == XFS_EXT_UNWRITTEN) {
290 : force = true;
291 : nr_exts = XFS_IEXT_WRITE_UNWRITTEN_CNT;
292 : dblocks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
293 : }
294 : }
295 :
296 21360581 : error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, dblocks,
297 : rblocks, force, &tp);
298 21360894 : if (error)
299 : return error;
300 :
301 21336685 : error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK, nr_exts);
302 21336589 : if (error == -EFBIG)
303 0 : error = xfs_iext_count_upgrade(tp, ip, nr_exts);
304 21336589 : if (error)
305 0 : goto out_trans_cancel;
306 :
307 : /*
308 : * From this point onwards we overwrite the imap pointer that the
309 : * caller gave to us.
310 : */
311 21336589 : nimaps = 1;
312 21336589 : error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flags, 0,
313 : imap, &nimaps);
314 21336660 : if (error)
315 285 : goto out_trans_cancel;
316 :
317 : /*
318 : * Complete the transaction
319 : */
320 21336375 : error = xfs_trans_commit(tp);
321 21336401 : if (error)
322 143 : goto out_unlock;
323 :
324 : /*
325 : * Copy any maps to caller's array and return any error.
326 : */
327 21336258 : if (nimaps == 0) {
328 0 : error = -ENOSPC;
329 0 : goto out_unlock;
330 : }
331 :
332 21336258 : if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock))) {
333 0 : xfs_bmap_mark_sick(ip, XFS_DATA_FORK);
334 0 : error = xfs_alert_fsblock_zero(ip, imap);
335 : }
336 :
337 21336258 : out_unlock:
338 21336686 : *seq = xfs_iomap_inode_sequence(ip, 0);
339 21336686 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
340 21336686 : return error;
341 :
342 285 : out_trans_cancel:
343 285 : xfs_trans_cancel(tp);
344 285 : goto out_unlock;
345 : }
346 :
347 : STATIC bool
348 701629 : xfs_quota_need_throttle(
349 : struct xfs_inode *ip,
350 : xfs_dqtype_t type,
351 : xfs_fsblock_t alloc_blocks)
352 : {
353 701629 : struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
354 :
355 701629 : if (!dq || !xfs_this_quota_on(ip->i_mount, type))
356 : return false;
357 :
358 : /* no hi watermark, no throttle */
359 688868 : if (!dq->q_prealloc_hi_wmark)
360 : return false;
361 :
362 : /* under the lo watermark, no throttle */
363 3905 : if (dq->q_blk.reserved + alloc_blocks < dq->q_prealloc_lo_wmark)
364 435 : return false;
365 :
366 : return true;
367 : }
368 :
369 : STATIC void
370 3470 : xfs_quota_calc_throttle(
371 : struct xfs_inode *ip,
372 : xfs_dqtype_t type,
373 : xfs_fsblock_t *qblocks,
374 : int *qshift,
375 : int64_t *qfreesp)
376 : {
377 3470 : struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
378 3470 : int64_t freesp;
379 3470 : int shift = 0;
380 :
381 : /* no dq, or over hi wmark, squash the prealloc completely */
382 3470 : if (!dq || dq->q_blk.reserved >= dq->q_prealloc_hi_wmark) {
383 305 : *qblocks = 0;
384 305 : *qfreesp = 0;
385 305 : return;
386 : }
387 :
388 3165 : freesp = dq->q_prealloc_hi_wmark - dq->q_blk.reserved;
389 3165 : if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
390 409 : shift = 2;
391 409 : if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
392 373 : shift += 2;
393 409 : if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT])
394 323 : shift += 2;
395 : }
396 :
397 3165 : if (freesp < *qfreesp)
398 3161 : *qfreesp = freesp;
399 :
400 : /* only overwrite the throttle values if we are more aggressive */
401 3165 : if ((freesp >> shift) < (*qblocks >> *qshift)) {
402 535 : *qblocks = freesp;
403 535 : *qshift = shift;
404 : }
405 : }
406 :
407 : /*
408 : * If we don't have a user specified preallocation size, dynamically increase
409 : * the preallocation size as the size of the file grows. Cap the maximum size
410 : * at a single extent or less if the filesystem is near full. The closer the
411 : * filesystem is to being full, the smaller the maximum preallocation.
412 : */
413 : STATIC xfs_fsblock_t
414 8009884 : xfs_iomap_prealloc_size(
415 : struct xfs_inode *ip,
416 : int whichfork,
417 : loff_t offset,
418 : loff_t count,
419 : struct xfs_iext_cursor *icur)
420 : {
421 8009884 : struct xfs_iext_cursor ncur = *icur;
422 8009884 : struct xfs_bmbt_irec prev, got;
423 8009884 : struct xfs_mount *mp = ip->i_mount;
424 8009884 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
425 8010215 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
426 8010215 : int64_t freesp;
427 8010215 : xfs_fsblock_t qblocks;
428 8010215 : xfs_fsblock_t alloc_blocks = 0;
429 8010215 : xfs_extlen_t plen;
430 8010215 : int shift = 0;
431 8010215 : int qshift = 0;
432 :
433 : /*
434 : * As an exception we don't do any preallocation at all if the file is
435 : * smaller than the minimum preallocation and we are using the default
436 : * dynamic preallocation scheme, as it is likely this is the only write
437 : * to the file that is going to be done.
438 : */
439 16020430 : if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_allocsize_blocks))
440 : return 0;
441 :
442 : /*
443 : * Use the minimum preallocation size for small files or if we are
444 : * writing right after a hole.
445 : */
446 7701277 : if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) ||
447 3850333 : !xfs_iext_prev_extent(ifp, &ncur, &prev) ||
448 3624009 : prev.br_startoff + prev.br_blockcount < offset_fsb)
449 3617061 : return mp->m_allocsize_blocks;
450 :
451 : /*
452 : * Take the size of the preceding data extents as the basis for the
453 : * preallocation size. Note that we don't care if the previous extents
454 : * are written or not.
455 : */
456 233883 : plen = prev.br_blockcount;
457 255782 : while (xfs_iext_prev_extent(ifp, &ncur, &got)) {
458 123462 : if (plen > XFS_MAX_BMBT_EXTLEN / 2 ||
459 123458 : isnullstartblock(got.br_startblock) ||
460 96430 : got.br_startoff + got.br_blockcount != prev.br_startoff ||
461 50680 : got.br_startblock + got.br_blockcount != prev.br_startblock)
462 : break;
463 21899 : plen += got.br_blockcount;
464 21899 : prev = got;
465 : }
466 :
467 : /*
468 : * If the size of the extents is greater than half the maximum extent
469 : * length, then use the current offset as the basis. This ensures that
470 : * for large files the preallocation size always extends to
471 : * XFS_BMBT_MAX_EXTLEN rather than falling short due to things like stripe
472 : * unit/width alignment of real extents.
473 : */
474 233882 : alloc_blocks = plen * 2;
475 233882 : if (alloc_blocks > XFS_MAX_BMBT_EXTLEN)
476 4 : alloc_blocks = XFS_B_TO_FSB(mp, offset);
477 233882 : qblocks = alloc_blocks;
478 :
479 : /*
480 : * XFS_BMBT_MAX_EXTLEN is not a power of two value but we round the prealloc
481 : * down to the nearest power of two value after throttling. To prevent
482 : * the round down from unconditionally reducing the maximum supported
483 : * prealloc size, we round up first, apply appropriate throttling, round
484 : * down and cap the value to XFS_BMBT_MAX_EXTLEN.
485 : */
486 233882 : alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(XFS_MAX_BMBT_EXTLEN),
487 : alloc_blocks);
488 :
489 233882 : freesp = percpu_counter_read_positive(&mp->m_fdblocks);
490 233882 : if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
491 10065 : shift = 2;
492 10065 : if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
493 9584 : shift++;
494 10065 : if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
495 8928 : shift++;
496 10065 : if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
497 7903 : shift++;
498 10065 : if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
499 6275 : shift++;
500 : }
501 :
502 : /*
503 : * Check each quota to cap the prealloc size, provide a shift value to
504 : * throttle with and adjust amount of available space.
505 : */
506 233882 : if (xfs_quota_need_throttle(ip, XFS_DQTYPE_USER, alloc_blocks))
507 1199 : xfs_quota_calc_throttle(ip, XFS_DQTYPE_USER, &qblocks, &qshift,
508 : &freesp);
509 233882 : if (xfs_quota_need_throttle(ip, XFS_DQTYPE_GROUP, alloc_blocks))
510 1169 : xfs_quota_calc_throttle(ip, XFS_DQTYPE_GROUP, &qblocks, &qshift,
511 : &freesp);
512 233882 : if (xfs_quota_need_throttle(ip, XFS_DQTYPE_PROJ, alloc_blocks))
513 1102 : xfs_quota_calc_throttle(ip, XFS_DQTYPE_PROJ, &qblocks, &qshift,
514 : &freesp);
515 :
516 : /*
517 : * The final prealloc size is set to the minimum of free space available
518 : * in each of the quotas and the overall filesystem.
519 : *
520 : * The shift throttle value is set to the maximum value as determined by
521 : * the global low free space values and per-quota low free space values.
522 : */
523 233882 : alloc_blocks = min(alloc_blocks, qblocks);
524 233882 : shift = max(shift, qshift);
525 :
526 233882 : if (shift)
527 10474 : alloc_blocks >>= shift;
528 : /*
529 : * rounddown_pow_of_two() returns an undefined result if we pass in
530 : * alloc_blocks = 0.
531 : */
532 233882 : if (alloc_blocks)
533 231459 : alloc_blocks = rounddown_pow_of_two(alloc_blocks);
534 233882 : if (alloc_blocks > XFS_MAX_BMBT_EXTLEN)
535 0 : alloc_blocks = XFS_MAX_BMBT_EXTLEN;
536 :
537 : /*
538 : * If we are still trying to allocate more space than is
539 : * available, squash the prealloc hard. This can happen if we
540 : * have a large file on a small filesystem and the above
541 : * lowspace thresholds are smaller than XFS_BMBT_MAX_EXTLEN.
542 : */
543 237194 : while (alloc_blocks && alloc_blocks >= freesp)
544 3312 : alloc_blocks >>= 4;
545 233882 : if (alloc_blocks < mp->m_allocsize_blocks)
546 : alloc_blocks = mp->m_allocsize_blocks;
547 233882 : trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
548 : mp->m_allocsize_blocks);
549 233882 : return alloc_blocks;
550 : }
551 :
552 : int
553 35666387 : xfs_iomap_write_unwritten(
554 : xfs_inode_t *ip,
555 : xfs_off_t offset,
556 : xfs_off_t count,
557 : bool update_isize)
558 : {
559 35666387 : xfs_mount_t *mp = ip->i_mount;
560 35666387 : xfs_fileoff_t offset_fsb;
561 35666387 : xfs_filblks_t count_fsb;
562 35666387 : xfs_filblks_t numblks_fsb;
563 35666387 : int nimaps;
564 35666387 : xfs_trans_t *tp;
565 35666387 : xfs_bmbt_irec_t imap;
566 35666387 : struct inode *inode = VFS_I(ip);
567 35666387 : xfs_fsize_t i_size;
568 35666387 : uint resblks;
569 35666387 : int error;
570 :
571 35666387 : trace_xfs_unwritten_convert(ip, offset, count);
572 :
573 35666367 : offset_fsb = XFS_B_TO_FSBT(mp, offset);
574 35666367 : count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
575 35666367 : count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
576 :
577 : /*
578 : * Reserve enough blocks in this transaction for two complete extent
579 : * btree splits. We may be converting the middle part of an unwritten
580 : * extent and in this case we will insert two new extents in the btree
581 : * each of which could cause a full split.
582 : *
583 : * This reservation amount will be used in the first call to
584 : * xfs_bmbt_split() to select an AG with enough space to satisfy the
585 : * rest of the operation.
586 : */
587 35666367 : resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
588 :
589 : /* Attach dquots so that bmbt splits are accounted correctly. */
590 35666367 : error = xfs_qm_dqattach(ip);
591 35666461 : if (error)
592 : return error;
593 :
594 36591806 : do {
595 : /*
596 : * Set up a transaction to convert the range of extents
597 : * from unwritten to real. Do allocations in a loop until
598 : * we have covered the range passed in.
599 : *
600 : * Note that we can't risk to recursing back into the filesystem
601 : * here as we might be asked to write out the same inode that we
602 : * complete here and might deadlock on the iolock.
603 : */
604 36591806 : error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, resblks,
605 : 0, true, &tp);
606 36591990 : if (error)
607 48 : return error;
608 :
609 36591942 : error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
610 : XFS_IEXT_WRITE_UNWRITTEN_CNT);
611 36591666 : if (error == -EFBIG)
612 7 : error = xfs_iext_count_upgrade(tp, ip,
613 : XFS_IEXT_WRITE_UNWRITTEN_CNT);
614 36591666 : if (error)
615 7 : goto error_on_bmapi_transaction;
616 :
617 : /*
618 : * Modify the unwritten extent state of the buffer.
619 : */
620 36591659 : nimaps = 1;
621 36591659 : error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
622 : XFS_BMAPI_CONVERT, resblks, &imap,
623 : &nimaps);
624 36591816 : if (error)
625 24 : goto error_on_bmapi_transaction;
626 :
627 : /*
628 : * Log the updated inode size as we go. We have to be careful
629 : * to only log it up to the actual write offset if it is
630 : * halfway into a block.
631 : */
632 36591792 : i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
633 36591792 : if (i_size > offset + count)
634 : i_size = offset + count;
635 36591792 : if (update_isize && i_size > i_size_read(inode))
636 1995493 : i_size_write(inode, i_size);
637 36591792 : i_size = xfs_new_eof(ip, i_size);
638 12885639 : if (i_size) {
639 12885643 : ip->i_disk_size = i_size;
640 12885643 : xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
641 : }
642 :
643 36591789 : error = xfs_trans_commit(tp);
644 36591968 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
645 36591955 : if (error)
646 333 : return error;
647 :
648 36591622 : if (unlikely(!xfs_valid_startblock(ip, imap.br_startblock))) {
649 0 : xfs_bmap_mark_sick(ip, XFS_DATA_FORK);
650 0 : return xfs_alert_fsblock_zero(ip, &imap);
651 : }
652 :
653 36591622 : if ((numblks_fsb = imap.br_blockcount) == 0) {
654 : /*
655 : * The numblks_fsb value should always get
656 : * smaller, otherwise the loop is stuck.
657 : */
658 0 : ASSERT(imap.br_blockcount);
659 : break;
660 : }
661 36591622 : offset_fsb += numblks_fsb;
662 36591622 : count_fsb -= numblks_fsb;
663 36591622 : } while (count_fsb > 0);
664 :
665 : return 0;
666 :
667 31 : error_on_bmapi_transaction:
668 31 : xfs_trans_cancel(tp);
669 31 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
670 31 : return error;
671 : }
672 :
673 : static inline bool
674 : imap_needs_alloc(
675 : struct inode *inode,
676 : unsigned flags,
677 : struct xfs_bmbt_irec *imap,
678 : int nimaps)
679 : {
680 : /* don't allocate blocks when just zeroing */
681 39042443 : if (flags & IOMAP_ZERO)
682 : return false;
683 27047364 : if (!nimaps ||
684 27047384 : imap->br_startblock == HOLESTARTBLOCK ||
685 : imap->br_startblock == DELAYSTARTBLOCK)
686 21739982 : return true;
687 : /* we convert unwritten extents before copying the data for DAX */
688 : if ((flags & IOMAP_DAX) && imap->br_state == XFS_EXT_UNWRITTEN)
689 : return true;
690 : return false;
691 : }
692 :
693 : static inline bool
694 41198892 : imap_needs_cow(
695 : struct xfs_inode *ip,
696 : unsigned int flags,
697 : struct xfs_bmbt_irec *imap,
698 : int nimaps)
699 : {
700 41198892 : if (!xfs_is_cow_inode(ip))
701 : return false;
702 :
703 : /* when zeroing we don't have to COW holes or unwritten extents */
704 26770494 : if (flags & IOMAP_ZERO) {
705 7482956 : if (!nimaps ||
706 7482939 : imap->br_startblock == HOLESTARTBLOCK ||
707 3291705 : imap->br_state == XFS_EXT_UNWRITTEN)
708 5150717 : return false;
709 : }
710 :
711 : return true;
712 : }
713 :
714 : static int
715 511238343 : xfs_ilock_for_iomap(
716 : struct xfs_inode *ip,
717 : unsigned flags,
718 : unsigned *lockmode)
719 : {
720 511238343 : unsigned int mode = *lockmode;
721 511238343 : bool is_write = flags & (IOMAP_WRITE | IOMAP_ZERO);
722 :
723 : /*
724 : * COW writes may allocate delalloc space or convert unwritten COW
725 : * extents, so we need to make sure to take the lock exclusively here.
726 : */
727 511238343 : if (xfs_is_cow_inode(ip) && is_write)
728 63029295 : mode = XFS_ILOCK_EXCL;
729 :
730 : /*
731 : * Extents not yet cached requires exclusive access, don't block. This
732 : * is an opencoded xfs_ilock_data_map_shared() call but with
733 : * non-blocking behaviour.
734 : */
735 511213355 : if (xfs_need_iread_extents(&ip->i_df)) {
736 1214882 : if (flags & IOMAP_NOWAIT)
737 : return -EAGAIN;
738 : mode = XFS_ILOCK_EXCL;
739 : }
740 :
741 510041744 : relock:
742 511254611 : if (flags & IOMAP_NOWAIT) {
743 0 : if (!xfs_ilock_nowait(ip, mode))
744 : return -EAGAIN;
745 : } else {
746 511254611 : xfs_ilock(ip, mode);
747 : }
748 :
749 : /*
750 : * The reflink iflag could have changed since the earlier unlocked
751 : * check, so if we got ILOCK_SHARED for a write and but we're now a
752 : * reflink inode we have to switch to ILOCK_EXCL and relock.
753 : */
754 511261899 : if (mode == XFS_ILOCK_SHARED && is_write && xfs_is_cow_inode(ip)) {
755 0 : xfs_iunlock(ip, mode);
756 508 : mode = XFS_ILOCK_EXCL;
757 508 : goto relock;
758 : }
759 :
760 511261902 : *lockmode = mode;
761 511261902 : return 0;
762 : }
763 :
764 : /*
765 : * Check that the imap we are going to return to the caller spans the entire
766 : * range that the caller requested for the IO.
767 : */
768 : static bool
769 : imap_spans_range(
770 : struct xfs_bmbt_irec *imap,
771 : xfs_fileoff_t offset_fsb,
772 : xfs_fileoff_t end_fsb)
773 : {
774 242618 : if (imap->br_startoff > offset_fsb)
775 : return false;
776 242618 : if (imap->br_startoff + imap->br_blockcount < end_fsb)
777 : return false;
778 : return true;
779 : }
780 :
781 : static int
782 41198763 : xfs_direct_write_iomap_begin(
783 : struct inode *inode,
784 : loff_t offset,
785 : loff_t length,
786 : unsigned flags,
787 : struct iomap *iomap,
788 : struct iomap *srcmap)
789 : {
790 41198763 : struct xfs_inode *ip = XFS_I(inode);
791 41198763 : struct xfs_mount *mp = ip->i_mount;
792 41198763 : struct xfs_bmbt_irec imap, cmap;
793 41198763 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
794 41198763 : xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
795 41198991 : int nimaps = 1, error = 0;
796 41198991 : bool shared = false;
797 41198991 : u16 iomap_flags = 0;
798 41198991 : unsigned int lockmode = XFS_ILOCK_SHARED;
799 41198991 : u64 seq;
800 :
801 41198991 : ASSERT(flags & (IOMAP_WRITE | IOMAP_ZERO));
802 :
803 82397982 : if (xfs_is_shutdown(mp))
804 : return -EIO;
805 :
806 : /*
807 : * Writes that span EOF might trigger an IO size update on completion,
808 : * so consider them to be dirty for the purposes of O_DSYNC even if
809 : * there is no other metadata changes pending or have been made here.
810 : */
811 41198970 : if (offset + length > i_size_read(inode))
812 20740739 : iomap_flags |= IOMAP_F_DIRTY;
813 :
814 41198970 : error = xfs_ilock_for_iomap(ip, flags, &lockmode);
815 41198973 : if (error)
816 : return error;
817 :
818 41198970 : error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
819 : &nimaps, 0);
820 41198820 : if (error)
821 8 : goto out_unlock;
822 :
823 41198812 : if (imap_needs_cow(ip, flags, &imap, nimaps)) {
824 21619884 : error = -EAGAIN;
825 21619884 : if (flags & IOMAP_NOWAIT)
826 0 : goto out_unlock;
827 :
828 : /* may drop and re-acquire the ilock */
829 21619884 : error = xfs_reflink_allocate_cow(ip, &imap, &cmap, &shared,
830 : &lockmode,
831 21619884 : (flags & IOMAP_DIRECT) || IS_DAX(inode));
832 21619789 : if (error)
833 34 : goto out_unlock;
834 21619755 : if (shared)
835 2156384 : goto out_found_cow;
836 19463371 : end_fsb = imap.br_startoff + imap.br_blockcount;
837 19463371 : length = XFS_FSB_TO_B(mp, end_fsb) - offset;
838 : }
839 :
840 39042443 : if (imap_needs_alloc(inode, flags, &imap, nimaps))
841 21739982 : goto allocate_blocks;
842 :
843 : /*
844 : * NOWAIT and OVERWRITE I/O needs to span the entire requested I/O with
845 : * a single map so that we avoid partial IO failures due to the rest of
846 : * the I/O range not covered by this map triggering an EAGAIN condition
847 : * when it is subsequently mapped and aborting the I/O.
848 : */
849 17302461 : if (flags & (IOMAP_NOWAIT | IOMAP_OVERWRITE_ONLY)) {
850 242618 : error = -EAGAIN;
851 242618 : if (!imap_spans_range(&imap, offset_fsb, end_fsb))
852 59499 : goto out_unlock;
853 : }
854 :
855 : /*
856 : * For overwrite only I/O, we cannot convert unwritten extents without
857 : * requiring sub-block zeroing. This can only be done under an
858 : * exclusive IOLOCK, hence return -EAGAIN if this is not a written
859 : * extent to tell the caller to try again.
860 : */
861 17242962 : if (flags & IOMAP_OVERWRITE_ONLY) {
862 183116 : error = -EAGAIN;
863 183116 : if (imap.br_state != XFS_EXT_NORM &&
864 82695 : ((offset | length) & mp->m_blockmask))
865 82695 : goto out_unlock;
866 : }
867 :
868 17160267 : seq = xfs_iomap_inode_sequence(ip, iomap_flags);
869 17160287 : xfs_iunlock(ip, lockmode);
870 17160278 : trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
871 17160282 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, iomap_flags, seq);
872 :
873 : allocate_blocks:
874 21739982 : error = -EAGAIN;
875 21739982 : if (flags & (IOMAP_NOWAIT | IOMAP_OVERWRITE_ONLY))
876 379357 : goto out_unlock;
877 :
878 : /*
879 : * We cap the maximum length we map to a sane size to keep the chunks
880 : * of work done where somewhat symmetric with the work writeback does.
881 : * This is a completely arbitrary number pulled out of thin air as a
882 : * best guess for initial testing.
883 : *
884 : * Note that the values needs to be less than 32-bits wide until the
885 : * lower level functions are updated.
886 : */
887 21360625 : length = min_t(loff_t, length, 1024 * PAGE_SIZE);
888 21360625 : end_fsb = xfs_iomap_end_fsb(mp, offset, length);
889 :
890 42721544 : if (offset + length > XFS_ISIZE(ip))
891 9930781 : end_fsb = xfs_iomap_eof_align_last_fsb(ip, end_fsb);
892 11429991 : else if (nimaps && imap.br_startblock == HOLESTARTBLOCK)
893 11430006 : end_fsb = min(end_fsb, imap.br_startoff + imap.br_blockcount);
894 21360644 : xfs_iunlock(ip, lockmode);
895 :
896 21360515 : error = xfs_iomap_write_direct(ip, offset_fsb, end_fsb - offset_fsb,
897 : flags, &imap, &seq);
898 21360895 : if (error)
899 : return error;
900 :
901 21336232 : trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
902 21336281 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags,
903 : iomap_flags | IOMAP_F_NEW, seq);
904 :
905 : out_found_cow:
906 2156384 : length = XFS_FSB_TO_B(mp, cmap.br_startoff + cmap.br_blockcount);
907 2156384 : trace_xfs_iomap_found(ip, offset, length - offset, XFS_COW_FORK, &cmap);
908 2156384 : if (imap.br_startblock != HOLESTARTBLOCK) {
909 1903654 : seq = xfs_iomap_inode_sequence(ip, 0);
910 1903654 : error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, seq);
911 1903654 : if (error)
912 0 : goto out_unlock;
913 : }
914 2156384 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED);
915 2156384 : xfs_iunlock(ip, lockmode);
916 2156383 : return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, IOMAP_F_SHARED, seq);
917 :
918 521593 : out_unlock:
919 521593 : if (lockmode)
920 521586 : xfs_iunlock(ip, lockmode);
921 : return error;
922 : }
923 :
924 : const struct iomap_ops xfs_direct_write_iomap_ops = {
925 : .iomap_begin = xfs_direct_write_iomap_begin,
926 : };
927 :
928 : static int
929 0 : xfs_dax_write_iomap_end(
930 : struct inode *inode,
931 : loff_t pos,
932 : loff_t length,
933 : ssize_t written,
934 : unsigned flags,
935 : struct iomap *iomap)
936 : {
937 0 : struct xfs_inode *ip = XFS_I(inode);
938 :
939 0 : if (!xfs_is_cow_inode(ip))
940 : return 0;
941 :
942 0 : if (!written) {
943 0 : xfs_reflink_cancel_cow_range(ip, pos, length, true);
944 0 : return 0;
945 : }
946 :
947 0 : return xfs_reflink_end_cow(ip, pos, written);
948 : }
949 :
950 : const struct iomap_ops xfs_dax_write_iomap_ops = {
951 : .iomap_begin = xfs_direct_write_iomap_begin,
952 : .iomap_end = xfs_dax_write_iomap_end,
953 : };
954 :
955 : static int
956 124824303 : xfs_buffered_write_iomap_begin(
957 : struct inode *inode,
958 : loff_t offset,
959 : loff_t count,
960 : unsigned flags,
961 : struct iomap *iomap,
962 : struct iomap *srcmap)
963 : {
964 124824303 : struct xfs_inode *ip = XFS_I(inode);
965 124824303 : struct xfs_mount *mp = ip->i_mount;
966 124824303 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
967 124824303 : xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, count);
968 124847811 : struct xfs_bmbt_irec imap, cmap;
969 124847811 : struct xfs_iext_cursor icur, ccur;
970 124847811 : xfs_fsblock_t prealloc_blocks = 0;
971 124847811 : bool eof = false, cow_eof = false, shared = false;
972 124847811 : int allocfork = XFS_DATA_FORK;
973 124847811 : int error = 0;
974 124847811 : unsigned int lockmode = XFS_ILOCK_EXCL;
975 124847811 : u64 seq;
976 :
977 249695622 : if (xfs_is_shutdown(mp))
978 : return -EIO;
979 :
980 : /* we can't use delayed allocations when using extent size hints */
981 124847732 : if (xfs_get_extsz_hint(ip))
982 33048840 : return xfs_direct_write_iomap_begin(inode, offset, count,
983 : flags, iomap, srcmap);
984 :
985 91843041 : ASSERT(!XFS_IS_REALTIME_INODE(ip));
986 :
987 91843041 : error = xfs_qm_dqattach(ip);
988 91858379 : if (error)
989 : return error;
990 :
991 91859639 : error = xfs_ilock_for_iomap(ip, flags, &lockmode);
992 91886952 : if (error)
993 : return error;
994 :
995 183774294 : if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(&ip->i_df)) ||
996 91886952 : XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
997 441 : xfs_bmap_mark_sick(ip, XFS_DATA_FORK);
998 0 : error = -EFSCORRUPTED;
999 0 : goto out_unlock;
1000 : }
1001 :
1002 91886901 : XFS_STATS_INC(mp, xs_blk_mapw);
1003 :
1004 91886901 : error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1005 91890099 : if (error)
1006 2 : goto out_unlock;
1007 :
1008 : /*
1009 : * Search the data fork first to look up our source mapping. We
1010 : * always need the data fork map, as we have to return it to the
1011 : * iomap code so that the higher level write code can read data in to
1012 : * perform read-modify-write cycles for unaligned writes.
1013 : */
1014 91890097 : eof = !xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap);
1015 91907017 : if (eof)
1016 20587875 : imap.br_startoff = end_fsb; /* fake hole until the end */
1017 :
1018 : /* We never need to allocate blocks for zeroing or unsharing a hole. */
1019 91907017 : if ((flags & (IOMAP_UNSHARE | IOMAP_ZERO)) &&
1020 37340384 : imap.br_startoff > offset_fsb) {
1021 19663753 : xfs_hole_to_iomap(ip, iomap, offset_fsb, imap.br_startoff);
1022 19663781 : goto out_unlock;
1023 : }
1024 :
1025 : /*
1026 : * Search the COW fork extent list even if we did not find a data fork
1027 : * extent. This serves two purposes: first this implements the
1028 : * speculative preallocation using cowextsize, so that we also unshare
1029 : * block adjacent to shared blocks instead of just the shared blocks
1030 : * themselves. Second the lookup in the extent list is generally faster
1031 : * than going out to the shared extent tree.
1032 : */
1033 72243264 : if (xfs_is_cow_inode(ip)) {
1034 24371827 : if (!ip->i_cowfp) {
1035 0 : ASSERT(!xfs_is_reflink_inode(ip));
1036 0 : xfs_ifork_init_cow(ip);
1037 : }
1038 24371827 : cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
1039 24371634 : &ccur, &cmap);
1040 24371634 : if (!cow_eof && cmap.br_startoff <= offset_fsb) {
1041 971918 : trace_xfs_reflink_cow_found(ip, &cmap);
1042 972013 : goto found_cow;
1043 : }
1044 : }
1045 :
1046 71259984 : if (imap.br_startoff <= offset_fsb) {
1047 : /*
1048 : * For reflink files we may need a delalloc reservation when
1049 : * overwriting shared extents. This includes zeroing of
1050 : * existing extents that contain data.
1051 : */
1052 50773577 : if (!xfs_is_cow_inode(ip) ||
1053 9488446 : ((flags & IOMAP_ZERO) && imap.br_state != XFS_EXT_NORM)) {
1054 43606818 : trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
1055 : &imap);
1056 43608870 : goto found_imap;
1057 : }
1058 :
1059 7169994 : xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
1060 :
1061 : /* Trim the mapping to the nearest shared extent boundary. */
1062 7169984 : error = xfs_bmap_trim_cow(ip, &imap, &shared);
1063 7170006 : if (error)
1064 85 : goto out_unlock;
1065 :
1066 : /* Not shared? Just report the (potentially capped) extent. */
1067 7169921 : if (!shared) {
1068 6998209 : trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
1069 : &imap);
1070 6998208 : goto found_imap;
1071 : }
1072 :
1073 : /*
1074 : * Fork all the shared blocks from our write offset until the
1075 : * end of the extent.
1076 : */
1077 171712 : allocfork = XFS_COW_FORK;
1078 171712 : end_fsb = imap.br_startoff + imap.br_blockcount;
1079 : } else {
1080 : /*
1081 : * We cap the maximum length we map here to MAX_WRITEBACK_PAGES
1082 : * pages to keep the chunks of work done where somewhat
1083 : * symmetric with the work writeback does. This is a completely
1084 : * arbitrary number pulled out of thin air.
1085 : *
1086 : * Note that the values needs to be less than 32-bits wide until
1087 : * the lower level functions are updated.
1088 : */
1089 20486407 : count = min_t(loff_t, count, 1024 * PAGE_SIZE);
1090 20486407 : end_fsb = xfs_iomap_end_fsb(mp, offset, count);
1091 :
1092 20486026 : if (xfs_is_always_cow_inode(ip))
1093 0 : allocfork = XFS_COW_FORK;
1094 : }
1095 :
1096 31348233 : if (eof && offset + count > XFS_ISIZE(ip)) {
1097 : /*
1098 : * Determine the initial size of the preallocation.
1099 : * We clean up any extra preallocation when the file is closed.
1100 : */
1101 8020312 : if (xfs_has_allocsize(mp))
1102 10061 : prealloc_blocks = mp->m_allocsize_blocks;
1103 8010251 : else if (allocfork == XFS_DATA_FORK)
1104 8010251 : prealloc_blocks = xfs_iomap_prealloc_size(ip, allocfork,
1105 : offset, count, &icur);
1106 : else
1107 0 : prealloc_blocks = xfs_iomap_prealloc_size(ip, allocfork,
1108 : offset, count, &ccur);
1109 8018111 : if (prealloc_blocks) {
1110 3861000 : xfs_extlen_t align;
1111 3861000 : xfs_off_t end_offset;
1112 3861000 : xfs_fileoff_t p_end_fsb;
1113 :
1114 3861000 : end_offset = XFS_ALLOC_ALIGN(mp, offset + count - 1);
1115 3861000 : p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
1116 : prealloc_blocks;
1117 :
1118 3861000 : align = xfs_eof_alignment(ip);
1119 3861000 : if (align)
1120 6175 : p_end_fsb = roundup_64(p_end_fsb, align);
1121 :
1122 3861000 : p_end_fsb = min(p_end_fsb,
1123 : XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
1124 3861000 : ASSERT(p_end_fsb > offset_fsb);
1125 3861000 : prealloc_blocks = p_end_fsb - end_fsb;
1126 : }
1127 : }
1128 :
1129 16795029 : retry:
1130 21358497 : error = xfs_bmapi_reserve_delalloc(ip, allocfork, offset_fsb,
1131 : end_fsb - offset_fsb, prealloc_blocks,
1132 : allocfork == XFS_DATA_FORK ? &imap : &cmap,
1133 : allocfork == XFS_DATA_FORK ? &icur : &ccur,
1134 : allocfork == XFS_DATA_FORK ? eof : cow_eof);
1135 20840579 : switch (error) {
1136 : case 0:
1137 19814000 : break;
1138 1026572 : case -ENOSPC:
1139 : case -EDQUOT:
1140 : /* retry without any preallocation */
1141 1026572 : trace_xfs_delalloc_enospc(ip, offset, count);
1142 1026985 : if (prealloc_blocks) {
1143 187332 : prealloc_blocks = 0;
1144 187332 : goto retry;
1145 : }
1146 839660 : fallthrough;
1147 : default:
1148 839660 : goto out_unlock;
1149 : }
1150 :
1151 19814000 : if (allocfork == XFS_COW_FORK) {
1152 171176 : trace_xfs_iomap_alloc(ip, offset, count, allocfork, &cmap);
1153 171176 : goto found_cow;
1154 : }
1155 :
1156 : /*
1157 : * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch
1158 : * them out if the write happens to fail.
1159 : */
1160 19642824 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_NEW);
1161 19642824 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1162 19646624 : trace_xfs_iomap_alloc(ip, offset, count, allocfork, &imap);
1163 19646872 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_NEW, seq);
1164 :
1165 50607078 : found_imap:
1166 50607078 : seq = xfs_iomap_inode_sequence(ip, 0);
1167 50607078 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1168 50606080 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq);
1169 :
1170 1143189 : found_cow:
1171 1143189 : seq = xfs_iomap_inode_sequence(ip, 0);
1172 1143189 : if (imap.br_startoff <= offset_fsb) {
1173 1084477 : error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, seq);
1174 1084352 : if (error)
1175 0 : goto out_unlock;
1176 1084352 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED);
1177 1084352 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1178 1084283 : return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags,
1179 : IOMAP_F_SHARED, seq);
1180 : }
1181 :
1182 58712 : xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb);
1183 58712 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1184 58712 : return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, 0, seq);
1185 :
1186 20503528 : out_unlock:
1187 20503528 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1188 20503528 : return error;
1189 : }
1190 :
1191 : static int
1192 6415 : xfs_buffered_write_delalloc_punch(
1193 : struct inode *inode,
1194 : loff_t offset,
1195 : loff_t length)
1196 : {
1197 6415 : return xfs_bmap_punch_delalloc_range(XFS_I(inode), offset,
1198 : offset + length);
1199 : }
1200 :
1201 : static int
1202 117114941 : xfs_buffered_write_iomap_end(
1203 : struct inode *inode,
1204 : loff_t offset,
1205 : loff_t length,
1206 : ssize_t written,
1207 : unsigned flags,
1208 : struct iomap *iomap)
1209 : {
1210 :
1211 117114941 : struct xfs_mount *mp = XFS_M(inode->i_sb);
1212 117114941 : int error;
1213 :
1214 117114941 : error = iomap_file_buffered_write_punch_delalloc(inode, iomap, offset,
1215 : length, written, &xfs_buffered_write_delalloc_punch);
1216 117139353 : if (error && !xfs_is_shutdown(mp)) {
1217 0 : xfs_alert(mp, "%s: unable to clean up ino 0x%llx",
1218 : __func__, XFS_I(inode)->i_ino);
1219 0 : return error;
1220 : }
1221 : return 0;
1222 : }
1223 :
1224 : const struct iomap_ops xfs_buffered_write_iomap_ops = {
1225 : .iomap_begin = xfs_buffered_write_iomap_begin,
1226 : .iomap_end = xfs_buffered_write_iomap_end,
1227 : };
1228 :
1229 : /*
1230 : * iomap_page_mkwrite() will never fail in a way that requires delalloc extents
1231 : * that it allocated to be revoked. Hence we do not need an .iomap_end method
1232 : * for this operation.
1233 : */
1234 : const struct iomap_ops xfs_page_mkwrite_iomap_ops = {
1235 : .iomap_begin = xfs_buffered_write_iomap_begin,
1236 : };
1237 :
1238 : static int
1239 378182404 : xfs_read_iomap_begin(
1240 : struct inode *inode,
1241 : loff_t offset,
1242 : loff_t length,
1243 : unsigned flags,
1244 : struct iomap *iomap,
1245 : struct iomap *srcmap)
1246 : {
1247 378182404 : struct xfs_inode *ip = XFS_I(inode);
1248 378182404 : struct xfs_mount *mp = ip->i_mount;
1249 378182404 : struct xfs_bmbt_irec imap;
1250 378182404 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1251 378182404 : xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
1252 378182625 : int nimaps = 1, error = 0;
1253 378182625 : bool shared = false;
1254 378182625 : unsigned int lockmode = XFS_ILOCK_SHARED;
1255 378182625 : u64 seq;
1256 :
1257 378182625 : ASSERT(!(flags & (IOMAP_WRITE | IOMAP_ZERO)));
1258 :
1259 756365250 : if (xfs_is_shutdown(mp))
1260 : return -EIO;
1261 :
1262 378182219 : error = xfs_ilock_for_iomap(ip, flags, &lockmode);
1263 378189049 : if (error)
1264 : return error;
1265 378188201 : error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
1266 : &nimaps, 0);
1267 378187131 : if (!error && ((flags & IOMAP_REPORT) || IS_DAX(inode)))
1268 3396272 : error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
1269 756177665 : seq = xfs_iomap_inode_sequence(ip, shared ? IOMAP_F_SHARED : 0);
1270 378187887 : xfs_iunlock(ip, lockmode);
1271 :
1272 378191299 : if (error)
1273 : return error;
1274 378189952 : trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
1275 378192379 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags,
1276 378192379 : shared ? IOMAP_F_SHARED : 0, seq);
1277 : }
1278 :
1279 : const struct iomap_ops xfs_read_iomap_ops = {
1280 : .iomap_begin = xfs_read_iomap_begin,
1281 : };
1282 :
1283 : static int
1284 440275 : xfs_seek_iomap_begin(
1285 : struct inode *inode,
1286 : loff_t offset,
1287 : loff_t length,
1288 : unsigned flags,
1289 : struct iomap *iomap,
1290 : struct iomap *srcmap)
1291 : {
1292 440275 : struct xfs_inode *ip = XFS_I(inode);
1293 440275 : struct xfs_mount *mp = ip->i_mount;
1294 440275 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1295 440275 : xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
1296 440275 : xfs_fileoff_t cow_fsb = NULLFILEOFF, data_fsb = NULLFILEOFF;
1297 440275 : struct xfs_iext_cursor icur;
1298 440275 : struct xfs_bmbt_irec imap, cmap;
1299 440275 : int error = 0;
1300 440275 : unsigned lockmode;
1301 440275 : u64 seq;
1302 :
1303 880550 : if (xfs_is_shutdown(mp))
1304 : return -EIO;
1305 :
1306 440275 : lockmode = xfs_ilock_data_map_shared(ip);
1307 440275 : error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1308 440275 : if (error)
1309 0 : goto out_unlock;
1310 :
1311 440275 : if (xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap)) {
1312 : /*
1313 : * If we found a data extent we are done.
1314 : */
1315 430088 : if (imap.br_startoff <= offset_fsb)
1316 227551 : goto done;
1317 : data_fsb = imap.br_startoff;
1318 : } else {
1319 : /*
1320 : * Fake a hole until the end of the file.
1321 : */
1322 10187 : data_fsb = xfs_iomap_end_fsb(mp, offset, length);
1323 : }
1324 :
1325 : /*
1326 : * If a COW fork extent covers the hole, report it - capped to the next
1327 : * data fork extent:
1328 : */
1329 430741 : if (xfs_inode_has_cow_data(ip) &&
1330 5293 : xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &cmap))
1331 5242 : cow_fsb = cmap.br_startoff;
1332 212724 : if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
1333 664 : if (data_fsb < cow_fsb + cmap.br_blockcount)
1334 212 : end_fsb = min(end_fsb, data_fsb);
1335 664 : xfs_trim_extent(&cmap, offset_fsb, end_fsb);
1336 664 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED);
1337 664 : error = xfs_bmbt_to_iomap(ip, iomap, &cmap, flags,
1338 : IOMAP_F_SHARED, seq);
1339 : /*
1340 : * This is a COW extent, so we must probe the page cache
1341 : * because there could be dirty page cache being backed
1342 : * by this extent.
1343 : */
1344 664 : iomap->type = IOMAP_UNWRITTEN;
1345 664 : goto out_unlock;
1346 : }
1347 :
1348 : /*
1349 : * Else report a hole, capped to the next found data or COW extent.
1350 : */
1351 212060 : if (cow_fsb != NULLFILEOFF && cow_fsb < data_fsb)
1352 340 : imap.br_blockcount = cow_fsb - offset_fsb;
1353 : else
1354 211720 : imap.br_blockcount = data_fsb - offset_fsb;
1355 212060 : imap.br_startoff = offset_fsb;
1356 212060 : imap.br_startblock = HOLESTARTBLOCK;
1357 212060 : imap.br_state = XFS_EXT_NORM;
1358 439611 : done:
1359 439611 : seq = xfs_iomap_inode_sequence(ip, 0);
1360 439611 : xfs_trim_extent(&imap, offset_fsb, end_fsb);
1361 439611 : error = xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq);
1362 440275 : out_unlock:
1363 440275 : xfs_iunlock(ip, lockmode);
1364 440275 : return error;
1365 : }
1366 :
1367 : const struct iomap_ops xfs_seek_iomap_ops = {
1368 : .iomap_begin = xfs_seek_iomap_begin,
1369 : };
1370 :
1371 : static int
1372 333788 : xfs_xattr_iomap_begin(
1373 : struct inode *inode,
1374 : loff_t offset,
1375 : loff_t length,
1376 : unsigned flags,
1377 : struct iomap *iomap,
1378 : struct iomap *srcmap)
1379 : {
1380 333788 : struct xfs_inode *ip = XFS_I(inode);
1381 333788 : struct xfs_mount *mp = ip->i_mount;
1382 333788 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1383 333788 : xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
1384 333788 : struct xfs_bmbt_irec imap;
1385 333788 : int nimaps = 1, error = 0;
1386 333788 : unsigned lockmode;
1387 333788 : int seq;
1388 :
1389 667576 : if (xfs_is_shutdown(mp))
1390 : return -EIO;
1391 :
1392 333788 : lockmode = xfs_ilock_attr_map_shared(ip);
1393 :
1394 : /* if there are no attribute fork or extents, return ENOENT */
1395 333789 : if (!xfs_inode_has_attr_fork(ip) || !ip->i_af.if_nextents) {
1396 326107 : error = -ENOENT;
1397 326107 : goto out_unlock;
1398 : }
1399 :
1400 7682 : ASSERT(ip->i_af.if_format != XFS_DINODE_FMT_LOCAL);
1401 7682 : error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
1402 : &nimaps, XFS_BMAPI_ATTRFORK);
1403 333789 : out_unlock:
1404 :
1405 333789 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_XATTR);
1406 333789 : xfs_iunlock(ip, lockmode);
1407 :
1408 333789 : if (error)
1409 : return error;
1410 7682 : ASSERT(nimaps);
1411 7682 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_XATTR, seq);
1412 : }
1413 :
1414 : const struct iomap_ops xfs_xattr_iomap_ops = {
1415 : .iomap_begin = xfs_xattr_iomap_begin,
1416 : };
1417 :
1418 : int
1419 34538577 : xfs_zero_range(
1420 : struct xfs_inode *ip,
1421 : loff_t pos,
1422 : loff_t len,
1423 : bool *did_zero)
1424 : {
1425 34538577 : struct inode *inode = VFS_I(ip);
1426 :
1427 34538577 : if (IS_DAX(inode))
1428 : return dax_zero_range(inode, pos, len, did_zero,
1429 : &xfs_dax_write_iomap_ops);
1430 34538577 : return iomap_zero_range(inode, pos, len, did_zero,
1431 : &xfs_buffered_write_iomap_ops);
1432 : }
1433 :
1434 : int
1435 3072446 : xfs_truncate_page(
1436 : struct xfs_inode *ip,
1437 : loff_t pos,
1438 : bool *did_zero)
1439 : {
1440 3072446 : struct inode *inode = VFS_I(ip);
1441 :
1442 3072446 : if (IS_DAX(inode))
1443 : return dax_truncate_page(inode, pos, did_zero,
1444 : &xfs_dax_write_iomap_ops);
1445 3072446 : return iomap_truncate_page(inode, pos, did_zero,
1446 : &xfs_buffered_write_iomap_ops);
1447 : }
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