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 :
31 : #define XFS_ALLOC_ALIGN(mp, off) \
32 : (((off) >> mp->m_allocsize_log) << mp->m_allocsize_log)
33 :
34 : static int
35 0 : xfs_alert_fsblock_zero(
36 : xfs_inode_t *ip,
37 : xfs_bmbt_irec_t *imap)
38 : {
39 0 : xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
40 : "Access to block zero in inode %llu "
41 : "start_block: %llx start_off: %llx "
42 : "blkcnt: %llx extent-state: %x",
43 : (unsigned long long)ip->i_ino,
44 : (unsigned long long)imap->br_startblock,
45 : (unsigned long long)imap->br_startoff,
46 : (unsigned long long)imap->br_blockcount,
47 : imap->br_state);
48 0 : return -EFSCORRUPTED;
49 : }
50 :
51 : u64
52 221934962 : xfs_iomap_inode_sequence(
53 : struct xfs_inode *ip,
54 : u16 iomap_flags)
55 : {
56 300893911 : u64 cookie = 0;
57 :
58 221934962 : if (iomap_flags & IOMAP_F_XATTR)
59 0 : return READ_ONCE(ip->i_af.if_seq);
60 221934962 : if ((iomap_flags & IOMAP_F_SHARED) && ip->i_cowfp)
61 3861937 : cookie = (u64)READ_ONCE(ip->i_cowfp->if_seq) << 32;
62 221934962 : return cookie | READ_ONCE(ip->i_df.if_seq);
63 : }
64 :
65 : /*
66 : * Check that the iomap passed to us is still valid for the given offset and
67 : * length.
68 : */
69 : static bool
70 79875087 : xfs_iomap_valid(
71 : struct inode *inode,
72 : const struct iomap *iomap)
73 : {
74 79875087 : struct xfs_inode *ip = XFS_I(inode);
75 :
76 79885257 : if (iomap->validity_cookie !=
77 79875087 : xfs_iomap_inode_sequence(ip, iomap->flags)) {
78 8457 : trace_xfs_iomap_invalid(ip, iomap);
79 8457 : return false;
80 : }
81 :
82 79879800 : XFS_ERRORTAG_DELAY(ip->i_mount, XFS_ERRTAG_WRITE_DELAY_MS);
83 : return true;
84 : }
85 :
86 : static const struct iomap_folio_ops xfs_iomap_folio_ops = {
87 : .iomap_valid = xfs_iomap_valid,
88 : };
89 :
90 : int
91 237504651 : xfs_bmbt_to_iomap(
92 : struct xfs_inode *ip,
93 : struct iomap *iomap,
94 : struct xfs_bmbt_irec *imap,
95 : unsigned int mapping_flags,
96 : u16 iomap_flags,
97 : u64 sequence_cookie)
98 : {
99 237504651 : struct xfs_mount *mp = ip->i_mount;
100 237504651 : struct xfs_buftarg *target = xfs_inode_buftarg(ip);
101 :
102 237504651 : if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
103 0 : return xfs_alert_fsblock_zero(ip, imap);
104 :
105 237504651 : if (imap->br_startblock == HOLESTARTBLOCK) {
106 102044561 : iomap->addr = IOMAP_NULL_ADDR;
107 102044561 : iomap->type = IOMAP_HOLE;
108 135460090 : } else if (imap->br_startblock == DELAYSTARTBLOCK ||
109 : isnullstartblock(imap->br_startblock)) {
110 55601529 : iomap->addr = IOMAP_NULL_ADDR;
111 55601529 : iomap->type = IOMAP_DELALLOC;
112 : } else {
113 79858561 : iomap->addr = BBTOB(xfs_fsb_to_db(ip, imap->br_startblock));
114 79858981 : if (mapping_flags & IOMAP_DAX)
115 : iomap->addr += target->bt_dax_part_off;
116 :
117 79858981 : if (imap->br_state == XFS_EXT_UNWRITTEN)
118 42214508 : iomap->type = IOMAP_UNWRITTEN;
119 : else
120 37644473 : iomap->type = IOMAP_MAPPED;
121 :
122 : }
123 237505071 : iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
124 237505071 : iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
125 237505071 : if (mapping_flags & IOMAP_DAX)
126 : iomap->dax_dev = target->bt_daxdev;
127 : else
128 237505071 : iomap->bdev = target->bt_bdev;
129 237505071 : iomap->flags = iomap_flags;
130 :
131 237505071 : if (xfs_ipincount(ip) &&
132 131203471 : (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
133 112918097 : iomap->flags |= IOMAP_F_DIRTY;
134 :
135 237505071 : iomap->validity_cookie = sequence_cookie;
136 237505071 : iomap->folio_ops = &xfs_iomap_folio_ops;
137 237505071 : return 0;
138 : }
139 :
140 : static void
141 16146078 : xfs_hole_to_iomap(
142 : struct xfs_inode *ip,
143 : struct iomap *iomap,
144 : xfs_fileoff_t offset_fsb,
145 : xfs_fileoff_t end_fsb)
146 : {
147 16146078 : struct xfs_buftarg *target = xfs_inode_buftarg(ip);
148 :
149 16146078 : iomap->addr = IOMAP_NULL_ADDR;
150 16146078 : iomap->type = IOMAP_HOLE;
151 16146078 : iomap->offset = XFS_FSB_TO_B(ip->i_mount, offset_fsb);
152 16146078 : iomap->length = XFS_FSB_TO_B(ip->i_mount, end_fsb - offset_fsb);
153 16146078 : iomap->bdev = target->bt_bdev;
154 16146078 : iomap->dax_dev = target->bt_daxdev;
155 16146078 : }
156 :
157 : static inline xfs_fileoff_t
158 262799085 : xfs_iomap_end_fsb(
159 : struct xfs_mount *mp,
160 : loff_t offset,
161 : loff_t count)
162 : {
163 262799085 : ASSERT(offset <= mp->m_super->s_maxbytes);
164 262799085 : return min(XFS_B_TO_FSB(mp, offset + count),
165 : XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
166 : }
167 :
168 : static xfs_extlen_t
169 8977769 : xfs_eof_alignment(
170 : struct xfs_inode *ip)
171 : {
172 8977769 : struct xfs_mount *mp = ip->i_mount;
173 8977769 : xfs_extlen_t align = 0;
174 :
175 8977769 : if (!XFS_IS_REALTIME_INODE(ip)) {
176 : /*
177 : * Round up the allocation request to a stripe unit
178 : * (m_dalign) boundary if the file size is >= stripe unit
179 : * size, and we are allocating past the allocation eof.
180 : *
181 : * If mounted with the "-o swalloc" option the alignment is
182 : * increased from the strip unit size to the stripe width.
183 : */
184 6719134 : if (mp->m_swidth && xfs_has_swalloc(mp))
185 0 : align = mp->m_swidth;
186 6719134 : else if (mp->m_dalign)
187 9841 : align = mp->m_dalign;
188 :
189 19682 : if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align))
190 2618 : align = 0;
191 : }
192 :
193 8977769 : return align;
194 : }
195 :
196 : /*
197 : * Check if last_fsb is outside the last extent, and if so grow it to the next
198 : * stripe unit boundary.
199 : */
200 : xfs_fileoff_t
201 6169581 : xfs_iomap_eof_align_last_fsb(
202 : struct xfs_inode *ip,
203 : xfs_fileoff_t end_fsb)
204 : {
205 6169581 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
206 6169581 : xfs_extlen_t extsz = xfs_get_extsz_hint(ip);
207 6169583 : xfs_extlen_t align = xfs_eof_alignment(ip);
208 6169586 : struct xfs_bmbt_irec irec;
209 6169586 : struct xfs_iext_cursor icur;
210 :
211 6169586 : ASSERT(!xfs_need_iread_extents(ifp));
212 :
213 : /*
214 : * Always round up the allocation request to the extent hint boundary.
215 : */
216 6169588 : if (extsz) {
217 5355437 : if (align)
218 0 : align = roundup_64(align, extsz);
219 : else
220 : align = extsz;
221 : }
222 :
223 6169588 : if (align) {
224 5356303 : xfs_fileoff_t aligned_end_fsb = roundup_64(end_fsb, align);
225 :
226 5356301 : xfs_iext_last(ifp, &icur);
227 5356295 : if (!xfs_iext_get_extent(ifp, &icur, &irec) ||
228 4788727 : aligned_end_fsb >= irec.br_startoff + irec.br_blockcount)
229 5289110 : return aligned_end_fsb;
230 : }
231 :
232 : return end_fsb;
233 : }
234 :
235 : int
236 9764025 : xfs_iomap_write_direct(
237 : struct xfs_inode *ip,
238 : xfs_fileoff_t offset_fsb,
239 : xfs_fileoff_t count_fsb,
240 : unsigned int flags,
241 : struct xfs_bmbt_irec *imap,
242 : u64 *seq)
243 : {
244 9764025 : struct xfs_mount *mp = ip->i_mount;
245 9764025 : struct xfs_trans *tp;
246 9764025 : xfs_filblks_t resaligned;
247 9764025 : int nimaps;
248 9764025 : unsigned int dblocks, rblocks;
249 9764025 : bool force = false;
250 9764025 : int error;
251 9764025 : int bmapi_flags = XFS_BMAPI_PREALLOC;
252 9764025 : int nr_exts = XFS_IEXT_ADD_NOSPLIT_CNT;
253 :
254 9764025 : ASSERT(count_fsb > 0);
255 :
256 9764025 : resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb,
257 : xfs_get_extsz_hint(ip));
258 9764056 : if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
259 5112308 : dblocks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
260 5112308 : rblocks = resaligned;
261 : } else {
262 4651748 : dblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
263 4651748 : rblocks = 0;
264 : }
265 :
266 9764056 : error = xfs_qm_dqattach(ip);
267 9764014 : if (error)
268 : return error;
269 :
270 : /*
271 : * For DAX, we do not allocate unwritten extents, but instead we zero
272 : * the block before we commit the transaction. Ideally we'd like to do
273 : * this outside the transaction context, but if we commit and then crash
274 : * we may not have zeroed the blocks and this will be exposed on
275 : * recovery of the allocation. Hence we must zero before commit.
276 : *
277 : * Further, if we are mapping unwritten extents here, we need to zero
278 : * and convert them to written so that we don't need an unwritten extent
279 : * callback for DAX. This also means that we need to be able to dip into
280 : * the reserve block pool for bmbt block allocation if there is no space
281 : * left but we need to do unwritten extent conversion.
282 : */
283 9764002 : if (flags & IOMAP_DAX) {
284 : bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO;
285 : if (imap->br_state == XFS_EXT_UNWRITTEN) {
286 : force = true;
287 : nr_exts = XFS_IEXT_WRITE_UNWRITTEN_CNT;
288 : dblocks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
289 : }
290 : }
291 :
292 9764002 : error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, dblocks,
293 : rblocks, force, &tp);
294 9764068 : if (error)
295 : return error;
296 :
297 9645935 : error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK, nr_exts);
298 9645912 : if (error == -EFBIG)
299 0 : error = xfs_iext_count_upgrade(tp, ip, nr_exts);
300 9645912 : if (error)
301 0 : goto out_trans_cancel;
302 :
303 : /*
304 : * From this point onwards we overwrite the imap pointer that the
305 : * caller gave to us.
306 : */
307 9645912 : nimaps = 1;
308 9645912 : error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flags, 0,
309 : imap, &nimaps);
310 9645921 : if (error)
311 241 : goto out_trans_cancel;
312 :
313 : /*
314 : * Complete the transaction
315 : */
316 9645680 : error = xfs_trans_commit(tp);
317 9645710 : if (error)
318 137 : goto out_unlock;
319 :
320 : /*
321 : * Copy any maps to caller's array and return any error.
322 : */
323 9645573 : if (nimaps == 0) {
324 0 : error = -ENOSPC;
325 0 : goto out_unlock;
326 : }
327 :
328 9645573 : if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
329 0 : error = xfs_alert_fsblock_zero(ip, imap);
330 :
331 9630816 : out_unlock:
332 9645951 : *seq = xfs_iomap_inode_sequence(ip, 0);
333 9645951 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
334 9645951 : return error;
335 :
336 241 : out_trans_cancel:
337 241 : xfs_trans_cancel(tp);
338 241 : goto out_unlock;
339 : }
340 :
341 : STATIC bool
342 557473 : xfs_quota_need_throttle(
343 : struct xfs_inode *ip,
344 : xfs_dqtype_t type,
345 : xfs_fsblock_t alloc_blocks)
346 : {
347 557473 : struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
348 :
349 557473 : if (!dq || !xfs_this_quota_on(ip->i_mount, type))
350 : return false;
351 :
352 : /* no hi watermark, no throttle */
353 545219 : if (!dq->q_prealloc_hi_wmark)
354 : return false;
355 :
356 : /* under the lo watermark, no throttle */
357 3894 : if (dq->q_blk.reserved + alloc_blocks < dq->q_prealloc_lo_wmark)
358 422 : return false;
359 :
360 : return true;
361 : }
362 :
363 : STATIC void
364 3472 : xfs_quota_calc_throttle(
365 : struct xfs_inode *ip,
366 : xfs_dqtype_t type,
367 : xfs_fsblock_t *qblocks,
368 : int *qshift,
369 : int64_t *qfreesp)
370 : {
371 3472 : struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
372 3472 : int64_t freesp;
373 3472 : int shift = 0;
374 :
375 : /* no dq, or over hi wmark, squash the prealloc completely */
376 3472 : if (!dq || dq->q_blk.reserved >= dq->q_prealloc_hi_wmark) {
377 304 : *qblocks = 0;
378 304 : *qfreesp = 0;
379 304 : return;
380 : }
381 :
382 3168 : freesp = dq->q_prealloc_hi_wmark - dq->q_blk.reserved;
383 3168 : if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
384 404 : shift = 2;
385 404 : if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
386 368 : shift += 2;
387 404 : if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT])
388 316 : shift += 2;
389 : }
390 :
391 3168 : if (freesp < *qfreesp)
392 3164 : *qfreesp = freesp;
393 :
394 : /* only overwrite the throttle values if we are more aggressive */
395 3168 : if ((freesp >> shift) < (*qblocks >> *qshift)) {
396 532 : *qblocks = freesp;
397 532 : *qshift = shift;
398 : }
399 : }
400 :
401 : /*
402 : * If we don't have a user specified preallocation size, dynamically increase
403 : * the preallocation size as the size of the file grows. Cap the maximum size
404 : * at a single extent or less if the filesystem is near full. The closer the
405 : * filesystem is to being full, the smaller the maximum preallocation.
406 : */
407 : STATIC xfs_fsblock_t
408 6531194 : xfs_iomap_prealloc_size(
409 : struct xfs_inode *ip,
410 : int whichfork,
411 : loff_t offset,
412 : loff_t count,
413 : struct xfs_iext_cursor *icur)
414 : {
415 6531194 : struct xfs_iext_cursor ncur = *icur;
416 6531194 : struct xfs_bmbt_irec prev, got;
417 6531194 : struct xfs_mount *mp = ip->i_mount;
418 6531194 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
419 6531438 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
420 6531438 : int64_t freesp;
421 6531438 : xfs_fsblock_t qblocks;
422 6531438 : xfs_fsblock_t alloc_blocks = 0;
423 6531438 : xfs_extlen_t plen;
424 6531438 : int shift = 0;
425 6531438 : int qshift = 0;
426 :
427 : /*
428 : * As an exception we don't do any preallocation at all if the file is
429 : * smaller than the minimum preallocation and we are using the default
430 : * dynamic preallocation scheme, as it is likely this is the only write
431 : * to the file that is going to be done.
432 : */
433 13062876 : if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_allocsize_blocks))
434 : return 0;
435 :
436 : /*
437 : * Use the minimum preallocation size for small files or if we are
438 : * writing right after a hole.
439 : */
440 8393811 : if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) ||
441 2797500 : !xfs_iext_prev_extent(ifp, &ncur, &prev) ||
442 2633614 : prev.br_startoff + prev.br_blockcount < offset_fsb)
443 2612335 : return mp->m_allocsize_blocks;
444 :
445 : /*
446 : * Take the size of the preceding data extents as the basis for the
447 : * preallocation size. Note that we don't care if the previous extents
448 : * are written or not.
449 : */
450 185825 : plen = prev.br_blockcount;
451 203961 : while (xfs_iext_prev_extent(ifp, &ncur, &got)) {
452 107283 : if (plen > XFS_MAX_BMBT_EXTLEN / 2 ||
453 107279 : isnullstartblock(got.br_startblock) ||
454 84306 : got.br_startoff + got.br_blockcount != prev.br_startoff ||
455 45696 : got.br_startblock + got.br_blockcount != prev.br_startblock)
456 : break;
457 18136 : plen += got.br_blockcount;
458 18136 : prev = got;
459 : }
460 :
461 : /*
462 : * If the size of the extents is greater than half the maximum extent
463 : * length, then use the current offset as the basis. This ensures that
464 : * for large files the preallocation size always extends to
465 : * XFS_BMBT_MAX_EXTLEN rather than falling short due to things like stripe
466 : * unit/width alignment of real extents.
467 : */
468 185825 : alloc_blocks = plen * 2;
469 185825 : if (alloc_blocks > XFS_MAX_BMBT_EXTLEN)
470 4 : alloc_blocks = XFS_B_TO_FSB(mp, offset);
471 185825 : qblocks = alloc_blocks;
472 :
473 : /*
474 : * XFS_BMBT_MAX_EXTLEN is not a power of two value but we round the prealloc
475 : * down to the nearest power of two value after throttling. To prevent
476 : * the round down from unconditionally reducing the maximum supported
477 : * prealloc size, we round up first, apply appropriate throttling, round
478 : * down and cap the value to XFS_BMBT_MAX_EXTLEN.
479 : */
480 185825 : alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(XFS_MAX_BMBT_EXTLEN),
481 : alloc_blocks);
482 :
483 185825 : freesp = percpu_counter_read_positive(&mp->m_fdblocks);
484 185825 : if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
485 7552 : shift = 2;
486 7552 : if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
487 7175 : shift++;
488 7552 : if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
489 6707 : shift++;
490 7552 : if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
491 6169 : shift++;
492 7552 : if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
493 5179 : shift++;
494 : }
495 :
496 : /*
497 : * Check each quota to cap the prealloc size, provide a shift value to
498 : * throttle with and adjust amount of available space.
499 : */
500 185825 : if (xfs_quota_need_throttle(ip, XFS_DQTYPE_USER, alloc_blocks))
501 1193 : xfs_quota_calc_throttle(ip, XFS_DQTYPE_USER, &qblocks, &qshift,
502 : &freesp);
503 185825 : if (xfs_quota_need_throttle(ip, XFS_DQTYPE_GROUP, alloc_blocks))
504 1177 : xfs_quota_calc_throttle(ip, XFS_DQTYPE_GROUP, &qblocks, &qshift,
505 : &freesp);
506 185825 : if (xfs_quota_need_throttle(ip, XFS_DQTYPE_PROJ, alloc_blocks))
507 1102 : xfs_quota_calc_throttle(ip, XFS_DQTYPE_PROJ, &qblocks, &qshift,
508 : &freesp);
509 :
510 : /*
511 : * The final prealloc size is set to the minimum of free space available
512 : * in each of the quotas and the overall filesystem.
513 : *
514 : * The shift throttle value is set to the maximum value as determined by
515 : * the global low free space values and per-quota low free space values.
516 : */
517 185825 : alloc_blocks = min(alloc_blocks, qblocks);
518 185825 : shift = max(shift, qshift);
519 :
520 185825 : if (shift)
521 7956 : alloc_blocks >>= shift;
522 : /*
523 : * rounddown_pow_of_two() returns an undefined result if we pass in
524 : * alloc_blocks = 0.
525 : */
526 185825 : if (alloc_blocks)
527 183623 : alloc_blocks = rounddown_pow_of_two(alloc_blocks);
528 185825 : if (alloc_blocks > XFS_MAX_BMBT_EXTLEN)
529 : alloc_blocks = XFS_MAX_BMBT_EXTLEN;
530 :
531 : /*
532 : * If we are still trying to allocate more space than is
533 : * available, squash the prealloc hard. This can happen if we
534 : * have a large file on a small filesystem and the above
535 : * lowspace thresholds are smaller than XFS_BMBT_MAX_EXTLEN.
536 : */
537 188966 : while (alloc_blocks && alloc_blocks >= freesp)
538 3141 : alloc_blocks >>= 4;
539 185825 : if (alloc_blocks < mp->m_allocsize_blocks)
540 : alloc_blocks = mp->m_allocsize_blocks;
541 185825 : trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
542 : mp->m_allocsize_blocks);
543 185825 : return alloc_blocks;
544 : }
545 :
546 : int
547 20599514 : xfs_iomap_write_unwritten(
548 : xfs_inode_t *ip,
549 : xfs_off_t offset,
550 : xfs_off_t count,
551 : bool update_isize)
552 : {
553 20599514 : xfs_mount_t *mp = ip->i_mount;
554 20599514 : xfs_fileoff_t offset_fsb;
555 20599514 : xfs_filblks_t count_fsb;
556 20599514 : xfs_filblks_t numblks_fsb;
557 20599514 : int nimaps;
558 20599514 : xfs_trans_t *tp;
559 20599514 : xfs_bmbt_irec_t imap;
560 20599514 : struct inode *inode = VFS_I(ip);
561 20599514 : xfs_fsize_t i_size;
562 20599514 : uint resblks;
563 20599514 : int error;
564 :
565 20599514 : trace_xfs_unwritten_convert(ip, offset, count);
566 :
567 20599431 : offset_fsb = XFS_B_TO_FSBT(mp, offset);
568 20599431 : count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
569 20599431 : count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
570 :
571 : /*
572 : * Reserve enough blocks in this transaction for two complete extent
573 : * btree splits. We may be converting the middle part of an unwritten
574 : * extent and in this case we will insert two new extents in the btree
575 : * each of which could cause a full split.
576 : *
577 : * This reservation amount will be used in the first call to
578 : * xfs_bmbt_split() to select an AG with enough space to satisfy the
579 : * rest of the operation.
580 : */
581 20599431 : resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
582 :
583 : /* Attach dquots so that bmbt splits are accounted correctly. */
584 20599431 : error = xfs_qm_dqattach(ip);
585 20599580 : if (error)
586 : return error;
587 :
588 21003043 : do {
589 : /*
590 : * Set up a transaction to convert the range of extents
591 : * from unwritten to real. Do allocations in a loop until
592 : * we have covered the range passed in.
593 : *
594 : * Note that we can't risk to recursing back into the filesystem
595 : * here as we might be asked to write out the same inode that we
596 : * complete here and might deadlock on the iolock.
597 : */
598 21003043 : error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, resblks,
599 : 0, true, &tp);
600 21002981 : if (error)
601 60 : return error;
602 :
603 21002921 : error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
604 : XFS_IEXT_WRITE_UNWRITTEN_CNT);
605 21002800 : if (error == -EFBIG)
606 8 : error = xfs_iext_count_upgrade(tp, ip,
607 : XFS_IEXT_WRITE_UNWRITTEN_CNT);
608 21002800 : if (error)
609 8 : goto error_on_bmapi_transaction;
610 :
611 : /*
612 : * Modify the unwritten extent state of the buffer.
613 : */
614 21002792 : nimaps = 1;
615 21002792 : error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
616 : XFS_BMAPI_CONVERT, resblks, &imap,
617 : &nimaps);
618 21003080 : if (error)
619 34 : goto error_on_bmapi_transaction;
620 :
621 : /*
622 : * Log the updated inode size as we go. We have to be careful
623 : * to only log it up to the actual write offset if it is
624 : * halfway into a block.
625 : */
626 21003046 : i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
627 21003046 : if (i_size > offset + count)
628 : i_size = offset + count;
629 21003046 : if (update_isize && i_size > i_size_read(inode))
630 1441647 : i_size_write(inode, i_size);
631 21003046 : i_size = xfs_new_eof(ip, i_size);
632 8982769 : if (i_size) {
633 8982767 : ip->i_disk_size = i_size;
634 8982767 : xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
635 : }
636 :
637 21003053 : error = xfs_trans_commit(tp);
638 21002966 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
639 21002968 : if (error)
640 314 : return error;
641 :
642 21002654 : if (unlikely(!xfs_valid_startblock(ip, imap.br_startblock)))
643 0 : return xfs_alert_fsblock_zero(ip, &imap);
644 :
645 21002654 : if ((numblks_fsb = imap.br_blockcount) == 0) {
646 : /*
647 : * The numblks_fsb value should always get
648 : * smaller, otherwise the loop is stuck.
649 : */
650 0 : ASSERT(imap.br_blockcount);
651 : break;
652 : }
653 21002654 : offset_fsb += numblks_fsb;
654 21002654 : count_fsb -= numblks_fsb;
655 21002654 : } while (count_fsb > 0);
656 :
657 : return 0;
658 :
659 42 : error_on_bmapi_transaction:
660 42 : xfs_trans_cancel(tp);
661 42 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
662 42 : return error;
663 : }
664 :
665 : static inline bool
666 : imap_needs_alloc(
667 : struct inode *inode,
668 : unsigned flags,
669 : struct xfs_bmbt_irec *imap,
670 : int nimaps)
671 : {
672 : /* don't allocate blocks when just zeroing */
673 20202781 : if (flags & IOMAP_ZERO)
674 : return false;
675 14331624 : if (!nimaps ||
676 14331620 : imap->br_startblock == HOLESTARTBLOCK ||
677 : imap->br_startblock == DELAYSTARTBLOCK)
678 10295318 : return true;
679 : /* we convert unwritten extents before copying the data for DAX */
680 : if ((flags & IOMAP_DAX) && imap->br_state == XFS_EXT_UNWRITTEN)
681 : return true;
682 : return false;
683 : }
684 :
685 : static inline bool
686 21554736 : imap_needs_cow(
687 : struct xfs_inode *ip,
688 : unsigned int flags,
689 : struct xfs_bmbt_irec *imap,
690 : int nimaps)
691 : {
692 21554736 : if (!xfs_is_cow_inode(ip))
693 : return false;
694 :
695 : /* when zeroing we don't have to COW holes or unwritten extents */
696 2902439 : if (flags & IOMAP_ZERO) {
697 0 : if (!nimaps ||
698 0 : imap->br_startblock == HOLESTARTBLOCK ||
699 0 : imap->br_state == XFS_EXT_UNWRITTEN)
700 0 : return false;
701 : }
702 :
703 : return true;
704 : }
705 :
706 : static int
707 222436932 : xfs_ilock_for_iomap(
708 : struct xfs_inode *ip,
709 : unsigned flags,
710 : unsigned *lockmode)
711 : {
712 222436932 : unsigned int mode = *lockmode;
713 222436932 : bool is_write = flags & (IOMAP_WRITE | IOMAP_ZERO);
714 :
715 : /*
716 : * COW writes may allocate delalloc space or convert unwritten COW
717 : * extents, so we need to make sure to take the lock exclusively here.
718 : */
719 222436932 : if (xfs_is_cow_inode(ip) && is_write)
720 31521235 : mode = XFS_ILOCK_EXCL;
721 :
722 : /*
723 : * Extents not yet cached requires exclusive access, don't block. This
724 : * is an opencoded xfs_ilock_data_map_shared() call but with
725 : * non-blocking behaviour.
726 : */
727 222446839 : if (xfs_need_iread_extents(&ip->i_df)) {
728 265051 : if (flags & IOMAP_NOWAIT)
729 : return -EAGAIN;
730 : mode = XFS_ILOCK_EXCL;
731 : }
732 :
733 222184744 : relock:
734 222446810 : if (flags & IOMAP_NOWAIT) {
735 0 : if (!xfs_ilock_nowait(ip, mode))
736 : return -EAGAIN;
737 : } else {
738 222446810 : xfs_ilock(ip, mode);
739 : }
740 :
741 : /*
742 : * The reflink iflag could have changed since the earlier unlocked
743 : * check, so if we got ILOCK_SHARED for a write and but we're now a
744 : * reflink inode we have to switch to ILOCK_EXCL and relock.
745 : */
746 222452660 : if (mode == XFS_ILOCK_SHARED && is_write && xfs_is_cow_inode(ip)) {
747 0 : xfs_iunlock(ip, mode);
748 37 : mode = XFS_ILOCK_EXCL;
749 37 : goto relock;
750 : }
751 :
752 222452706 : *lockmode = mode;
753 222452706 : return 0;
754 : }
755 :
756 : /*
757 : * Check that the imap we are going to return to the caller spans the entire
758 : * range that the caller requested for the IO.
759 : */
760 : static bool
761 : imap_spans_range(
762 : struct xfs_bmbt_irec *imap,
763 : xfs_fileoff_t offset_fsb,
764 : xfs_fileoff_t end_fsb)
765 : {
766 244835 : if (imap->br_startoff > offset_fsb)
767 : return false;
768 244835 : if (imap->br_startoff + imap->br_blockcount < end_fsb)
769 : return false;
770 : return true;
771 : }
772 :
773 : static int
774 21554664 : xfs_direct_write_iomap_begin(
775 : struct inode *inode,
776 : loff_t offset,
777 : loff_t length,
778 : unsigned flags,
779 : struct iomap *iomap,
780 : struct iomap *srcmap)
781 : {
782 21554664 : struct xfs_inode *ip = XFS_I(inode);
783 21554664 : struct xfs_mount *mp = ip->i_mount;
784 21554664 : struct xfs_bmbt_irec imap, cmap;
785 21554664 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
786 21554664 : xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
787 21554787 : int nimaps = 1, error = 0;
788 21554787 : bool shared = false;
789 21554787 : u16 iomap_flags = 0;
790 21554787 : unsigned int lockmode = XFS_ILOCK_SHARED;
791 21554787 : u64 seq;
792 :
793 21554787 : ASSERT(flags & (IOMAP_WRITE | IOMAP_ZERO));
794 :
795 43109574 : if (xfs_is_shutdown(mp))
796 : return -EIO;
797 :
798 : /*
799 : * Writes that span EOF might trigger an IO size update on completion,
800 : * so consider them to be dirty for the purposes of O_DSYNC even if
801 : * there is no other metadata changes pending or have been made here.
802 : */
803 21554776 : if (offset + length > i_size_read(inode))
804 11297500 : iomap_flags |= IOMAP_F_DIRTY;
805 :
806 21554776 : error = xfs_ilock_for_iomap(ip, flags, &lockmode);
807 21554837 : if (error)
808 : return error;
809 :
810 21554719 : error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
811 : &nimaps, 0);
812 21554709 : if (error)
813 10 : goto out_unlock;
814 :
815 21554699 : if (imap_needs_cow(ip, flags, &imap, nimaps)) {
816 2902439 : error = -EAGAIN;
817 2902439 : if (flags & IOMAP_NOWAIT)
818 0 : goto out_unlock;
819 :
820 : /* may drop and re-acquire the ilock */
821 2902439 : error = xfs_reflink_allocate_cow(ip, &imap, &cmap, &shared,
822 : &lockmode,
823 2902439 : (flags & IOMAP_DIRECT) || IS_DAX(inode));
824 2902439 : if (error)
825 29 : goto out_unlock;
826 2902410 : if (shared)
827 1352049 : goto out_found_cow;
828 1550361 : end_fsb = imap.br_startoff + imap.br_blockcount;
829 1550361 : length = XFS_FSB_TO_B(mp, end_fsb) - offset;
830 : }
831 :
832 20202781 : if (imap_needs_alloc(inode, flags, &imap, nimaps))
833 10295318 : goto allocate_blocks;
834 :
835 : /*
836 : * NOWAIT and OVERWRITE I/O needs to span the entire requested I/O with
837 : * a single map so that we avoid partial IO failures due to the rest of
838 : * the I/O range not covered by this map triggering an EAGAIN condition
839 : * when it is subsequently mapped and aborting the I/O.
840 : */
841 9907463 : if (flags & (IOMAP_NOWAIT | IOMAP_OVERWRITE_ONLY)) {
842 244835 : error = -EAGAIN;
843 244835 : if (!imap_spans_range(&imap, offset_fsb, end_fsb))
844 65586 : goto out_unlock;
845 : }
846 :
847 : /*
848 : * For overwrite only I/O, we cannot convert unwritten extents without
849 : * requiring sub-block zeroing. This can only be done under an
850 : * exclusive IOLOCK, hence return -EAGAIN if this is not a written
851 : * extent to tell the caller to try again.
852 : */
853 9841877 : if (flags & IOMAP_OVERWRITE_ONLY) {
854 179249 : error = -EAGAIN;
855 179249 : if (imap.br_state != XFS_EXT_NORM &&
856 73665 : ((offset | length) & mp->m_blockmask))
857 73665 : goto out_unlock;
858 : }
859 :
860 9768212 : seq = xfs_iomap_inode_sequence(ip, iomap_flags);
861 9768247 : xfs_iunlock(ip, lockmode);
862 9768293 : trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
863 9768296 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, iomap_flags, seq);
864 :
865 : allocate_blocks:
866 10295318 : error = -EAGAIN;
867 10295318 : if (flags & (IOMAP_NOWAIT | IOMAP_OVERWRITE_ONLY))
868 531319 : goto out_unlock;
869 :
870 : /*
871 : * We cap the maximum length we map to a sane size to keep the chunks
872 : * of work done where somewhat symmetric with the work writeback does.
873 : * This is a completely arbitrary number pulled out of thin air as a
874 : * best guess for initial testing.
875 : *
876 : * Note that the values needs to be less than 32-bits wide until the
877 : * lower level functions are updated.
878 : */
879 9763999 : length = min_t(loff_t, length, 1024 * PAGE_SIZE);
880 9763999 : end_fsb = xfs_iomap_end_fsb(mp, offset, length);
881 :
882 19528076 : if (offset + length > XFS_ISIZE(ip))
883 6169588 : end_fsb = xfs_iomap_eof_align_last_fsb(ip, end_fsb);
884 3594450 : else if (nimaps && imap.br_startblock == HOLESTARTBLOCK)
885 3594439 : end_fsb = min(end_fsb, imap.br_startoff + imap.br_blockcount);
886 9764025 : xfs_iunlock(ip, lockmode);
887 :
888 9764036 : error = xfs_iomap_write_direct(ip, offset_fsb, end_fsb - offset_fsb,
889 : flags, &imap, &seq);
890 9764077 : if (error)
891 : return error;
892 :
893 9645574 : trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
894 9645574 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags,
895 : iomap_flags | IOMAP_F_NEW, seq);
896 :
897 : out_found_cow:
898 1352049 : length = XFS_FSB_TO_B(mp, cmap.br_startoff + cmap.br_blockcount);
899 1352049 : trace_xfs_iomap_found(ip, offset, length - offset, XFS_COW_FORK, &cmap);
900 1352049 : if (imap.br_startblock != HOLESTARTBLOCK) {
901 1345051 : seq = xfs_iomap_inode_sequence(ip, 0);
902 1345051 : error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, seq);
903 1345051 : if (error)
904 0 : goto out_unlock;
905 : }
906 1352049 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED);
907 1352049 : xfs_iunlock(ip, lockmode);
908 1352049 : return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, IOMAP_F_SHARED, seq);
909 :
910 670609 : out_unlock:
911 670609 : if (lockmode)
912 670602 : xfs_iunlock(ip, lockmode);
913 : return error;
914 : }
915 :
916 : const struct iomap_ops xfs_direct_write_iomap_ops = {
917 : .iomap_begin = xfs_direct_write_iomap_begin,
918 : };
919 :
920 : static int
921 0 : xfs_dax_write_iomap_end(
922 : struct inode *inode,
923 : loff_t pos,
924 : loff_t length,
925 : ssize_t written,
926 : unsigned flags,
927 : struct iomap *iomap)
928 : {
929 0 : struct xfs_inode *ip = XFS_I(inode);
930 :
931 0 : if (!xfs_is_cow_inode(ip))
932 : return 0;
933 :
934 0 : if (!written) {
935 0 : xfs_reflink_cancel_cow_range(ip, pos, length, true);
936 0 : return 0;
937 : }
938 :
939 0 : return xfs_reflink_end_cow(ip, pos, written);
940 : }
941 :
942 : const struct iomap_ops xfs_dax_write_iomap_ops = {
943 : .iomap_begin = xfs_direct_write_iomap_begin,
944 : .iomap_end = xfs_dax_write_iomap_end,
945 : };
946 :
947 : static int
948 96261455 : xfs_buffered_write_iomap_begin(
949 : struct inode *inode,
950 : loff_t offset,
951 : loff_t count,
952 : unsigned flags,
953 : struct iomap *iomap,
954 : struct iomap *srcmap)
955 : {
956 96261455 : struct xfs_inode *ip = XFS_I(inode);
957 96261455 : struct xfs_mount *mp = ip->i_mount;
958 96261455 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
959 96261455 : xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, count);
960 96358274 : struct xfs_bmbt_irec imap, cmap;
961 96358274 : struct xfs_iext_cursor icur, ccur;
962 96358274 : xfs_fsblock_t prealloc_blocks = 0;
963 96358274 : bool eof = false, cow_eof = false, shared = false;
964 96358274 : int allocfork = XFS_DATA_FORK;
965 96358274 : int error = 0;
966 96358274 : unsigned int lockmode = XFS_ILOCK_EXCL;
967 96358274 : u64 seq;
968 :
969 192716548 : if (xfs_is_shutdown(mp))
970 : return -EIO;
971 :
972 : /* we can't use delayed allocations when using extent size hints */
973 96358188 : if (xfs_get_extsz_hint(ip))
974 14438502 : return xfs_direct_write_iomap_begin(inode, offset, count,
975 : flags, iomap, srcmap);
976 :
977 81934002 : ASSERT(!XFS_IS_REALTIME_INODE(ip));
978 :
979 81934002 : error = xfs_qm_dqattach(ip);
980 81900777 : if (error)
981 : return error;
982 :
983 81921548 : error = xfs_ilock_for_iomap(ip, flags, &lockmode);
984 81934926 : if (error)
985 : return error;
986 :
987 163752142 : if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(&ip->i_df)) ||
988 81934926 : XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
989 0 : error = -EFSCORRUPTED;
990 0 : goto out_unlock;
991 : }
992 :
993 81817216 : XFS_STATS_INC(mp, xs_blk_mapw);
994 :
995 81935101 : error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
996 81936153 : if (error)
997 2 : goto out_unlock;
998 :
999 : /*
1000 : * Search the data fork first to look up our source mapping. We
1001 : * always need the data fork map, as we have to return it to the
1002 : * iomap code so that the higher level write code can read data in to
1003 : * perform read-modify-write cycles for unaligned writes.
1004 : */
1005 81936151 : eof = !xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap);
1006 81938261 : if (eof)
1007 16022496 : imap.br_startoff = end_fsb; /* fake hole until the end */
1008 :
1009 : /* We never need to allocate blocks for zeroing or unsharing a hole. */
1010 81938261 : if ((flags & (IOMAP_UNSHARE | IOMAP_ZERO)) &&
1011 32230576 : imap.br_startoff > offset_fsb) {
1012 16146048 : xfs_hole_to_iomap(ip, iomap, offset_fsb, imap.br_startoff);
1013 16146061 : goto out_unlock;
1014 : }
1015 :
1016 : /*
1017 : * Search the COW fork extent list even if we did not find a data fork
1018 : * extent. This serves two purposes: first this implements the
1019 : * speculative preallocation using cowextsize, so that we also unshare
1020 : * block adjacent to shared blocks instead of just the shared blocks
1021 : * themselves. Second the lookup in the extent list is generally faster
1022 : * than going out to the shared extent tree.
1023 : */
1024 65792213 : if (xfs_is_cow_inode(ip)) {
1025 19086949 : if (!ip->i_cowfp) {
1026 0 : ASSERT(!xfs_is_reflink_inode(ip));
1027 0 : xfs_ifork_init_cow(ip);
1028 : }
1029 19086949 : cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
1030 19086782 : &ccur, &cmap);
1031 19086782 : if (!cow_eof && cmap.br_startoff <= offset_fsb) {
1032 1031653 : trace_xfs_reflink_cow_found(ip, &cmap);
1033 1031651 : goto found_cow;
1034 : }
1035 : }
1036 :
1037 64757712 : if (imap.br_startoff <= offset_fsb) {
1038 : /*
1039 : * For reflink files we may need a delalloc reservation when
1040 : * overwriting shared extents. This includes zeroing of
1041 : * existing extents that contain data.
1042 : */
1043 48588437 : if (!xfs_is_cow_inode(ip) ||
1044 7894418 : ((flags & IOMAP_ZERO) && imap.br_state != XFS_EXT_NORM)) {
1045 42552722 : trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
1046 : &imap);
1047 42547546 : goto found_imap;
1048 : }
1049 :
1050 6033382 : xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
1051 :
1052 : /* Trim the mapping to the nearest shared extent boundary. */
1053 6033380 : error = xfs_bmap_trim_cow(ip, &imap, &shared);
1054 6033377 : if (error)
1055 90 : goto out_unlock;
1056 :
1057 : /* Not shared? Just report the (potentially capped) extent. */
1058 6033287 : if (!shared) {
1059 5863193 : trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
1060 : &imap);
1061 5863195 : goto found_imap;
1062 : }
1063 :
1064 : /*
1065 : * Fork all the shared blocks from our write offset until the
1066 : * end of the extent.
1067 : */
1068 170094 : allocfork = XFS_COW_FORK;
1069 170094 : end_fsb = imap.br_startoff + imap.br_blockcount;
1070 : } else {
1071 : /*
1072 : * We cap the maximum length we map here to MAX_WRITEBACK_PAGES
1073 : * pages to keep the chunks of work done where somewhat
1074 : * symmetric with the work writeback does. This is a completely
1075 : * arbitrary number pulled out of thin air.
1076 : *
1077 : * Note that the values needs to be less than 32-bits wide until
1078 : * the lower level functions are updated.
1079 : */
1080 16169275 : count = min_t(loff_t, count, 1024 * PAGE_SIZE);
1081 16169275 : end_fsb = xfs_iomap_end_fsb(mp, offset, count);
1082 :
1083 16173126 : if (xfs_is_always_cow_inode(ip))
1084 0 : allocfork = XFS_COW_FORK;
1085 : }
1086 :
1087 25050617 : if (eof && offset + count > XFS_ISIZE(ip)) {
1088 : /*
1089 : * Determine the initial size of the preallocation.
1090 : * We clean up any extra preallocation when the file is closed.
1091 : */
1092 6541466 : if (xfs_has_allocsize(mp))
1093 10004 : prealloc_blocks = mp->m_allocsize_blocks;
1094 6531462 : else if (allocfork == XFS_DATA_FORK)
1095 6531462 : prealloc_blocks = xfs_iomap_prealloc_size(ip, allocfork,
1096 : offset, count, &icur);
1097 : else
1098 0 : prealloc_blocks = xfs_iomap_prealloc_size(ip, allocfork,
1099 : offset, count, &ccur);
1100 6541138 : if (prealloc_blocks) {
1101 2808137 : xfs_extlen_t align;
1102 2808137 : xfs_off_t end_offset;
1103 2808137 : xfs_fileoff_t p_end_fsb;
1104 :
1105 2808137 : end_offset = XFS_ALLOC_ALIGN(mp, offset + count - 1);
1106 2808137 : p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
1107 : prealloc_blocks;
1108 :
1109 2808137 : align = xfs_eof_alignment(ip);
1110 2808139 : if (align)
1111 6359 : p_end_fsb = roundup_64(p_end_fsb, align);
1112 :
1113 2808139 : p_end_fsb = min(p_end_fsb,
1114 : XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
1115 2808139 : ASSERT(p_end_fsb > offset_fsb);
1116 2808139 : prealloc_blocks = p_end_fsb - end_fsb;
1117 : }
1118 : }
1119 :
1120 13535079 : retry:
1121 17032648 : error = xfs_bmapi_reserve_delalloc(ip, allocfork, offset_fsb,
1122 : end_fsb - offset_fsb, prealloc_blocks,
1123 : allocfork == XFS_DATA_FORK ? &imap : &cmap,
1124 : allocfork == XFS_DATA_FORK ? &icur : &ccur,
1125 : allocfork == XFS_DATA_FORK ? eof : cow_eof);
1126 16520666 : switch (error) {
1127 : case 0:
1128 15534385 : break;
1129 986281 : case -ENOSPC:
1130 : case -EDQUOT:
1131 : /* retry without any preallocation */
1132 986281 : trace_xfs_delalloc_enospc(ip, offset, count);
1133 986292 : if (prealloc_blocks) {
1134 179148 : prealloc_blocks = 0;
1135 179148 : goto retry;
1136 : }
1137 807144 : fallthrough;
1138 : default:
1139 807144 : goto out_unlock;
1140 : }
1141 :
1142 15534385 : if (allocfork == XFS_COW_FORK) {
1143 169648 : trace_xfs_iomap_alloc(ip, offset, count, allocfork, &cmap);
1144 169648 : goto found_cow;
1145 : }
1146 :
1147 : /*
1148 : * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch
1149 : * them out if the write happens to fail.
1150 : */
1151 15364737 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_NEW);
1152 15364737 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1153 15361831 : trace_xfs_iomap_alloc(ip, offset, count, allocfork, &imap);
1154 15366603 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_NEW, seq);
1155 :
1156 48410741 : found_imap:
1157 48410741 : seq = xfs_iomap_inode_sequence(ip, 0);
1158 48410741 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1159 48414042 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq);
1160 :
1161 1201299 : found_cow:
1162 1201299 : seq = xfs_iomap_inode_sequence(ip, 0);
1163 1201299 : if (imap.br_startoff <= offset_fsb) {
1164 1125792 : error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, seq);
1165 1125790 : if (error)
1166 0 : goto out_unlock;
1167 1125790 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED);
1168 1125790 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1169 1125764 : return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags,
1170 : IOMAP_F_SHARED, seq);
1171 : }
1172 :
1173 75507 : xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb);
1174 75507 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1175 75507 : return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, 0, seq);
1176 :
1177 16953297 : out_unlock:
1178 16953297 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
1179 16953297 : return error;
1180 : }
1181 :
1182 : static int
1183 3090 : xfs_buffered_write_delalloc_punch(
1184 : struct inode *inode,
1185 : loff_t offset,
1186 : loff_t length)
1187 : {
1188 3090 : return xfs_bmap_punch_delalloc_range(XFS_I(inode), offset,
1189 : offset + length);
1190 : }
1191 :
1192 : static int
1193 90102609 : xfs_buffered_write_iomap_end(
1194 : struct inode *inode,
1195 : loff_t offset,
1196 : loff_t length,
1197 : ssize_t written,
1198 : unsigned flags,
1199 : struct iomap *iomap)
1200 : {
1201 :
1202 90102609 : struct xfs_mount *mp = XFS_M(inode->i_sb);
1203 90102609 : int error;
1204 :
1205 90102609 : error = iomap_file_buffered_write_punch_delalloc(inode, iomap, offset,
1206 : length, written, &xfs_buffered_write_delalloc_punch);
1207 90103416 : if (error && !xfs_is_shutdown(mp)) {
1208 0 : xfs_alert(mp, "%s: unable to clean up ino 0x%llx",
1209 : __func__, XFS_I(inode)->i_ino);
1210 0 : return error;
1211 : }
1212 : return 0;
1213 : }
1214 :
1215 : const struct iomap_ops xfs_buffered_write_iomap_ops = {
1216 : .iomap_begin = xfs_buffered_write_iomap_begin,
1217 : .iomap_end = xfs_buffered_write_iomap_end,
1218 : };
1219 :
1220 : /*
1221 : * iomap_page_mkwrite() will never fail in a way that requires delalloc extents
1222 : * that it allocated to be revoked. Hence we do not need an .iomap_end method
1223 : * for this operation.
1224 : */
1225 : const struct iomap_ops xfs_page_mkwrite_iomap_ops = {
1226 : .iomap_begin = xfs_buffered_write_iomap_begin,
1227 : };
1228 :
1229 : static int
1230 118960826 : xfs_read_iomap_begin(
1231 : struct inode *inode,
1232 : loff_t offset,
1233 : loff_t length,
1234 : unsigned flags,
1235 : struct iomap *iomap,
1236 : struct iomap *srcmap)
1237 : {
1238 118960826 : struct xfs_inode *ip = XFS_I(inode);
1239 118960826 : struct xfs_mount *mp = ip->i_mount;
1240 118960826 : struct xfs_bmbt_irec imap;
1241 118960826 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1242 118960826 : xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
1243 118964745 : int nimaps = 1, error = 0;
1244 118964745 : bool shared = false;
1245 118964745 : unsigned int lockmode = XFS_ILOCK_SHARED;
1246 118964745 : u64 seq;
1247 :
1248 118964745 : ASSERT(!(flags & (IOMAP_WRITE | IOMAP_ZERO)));
1249 :
1250 237929490 : if (xfs_is_shutdown(mp))
1251 : return -EIO;
1252 :
1253 118964286 : error = xfs_ilock_for_iomap(ip, flags, &lockmode);
1254 118964800 : if (error)
1255 : return error;
1256 118964950 : error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
1257 : &nimaps, 0);
1258 118962883 : if (!error && ((flags & IOMAP_REPORT) || IS_DAX(inode)))
1259 2009313 : error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
1260 237811198 : seq = xfs_iomap_inode_sequence(ip, shared ? IOMAP_F_SHARED : 0);
1261 118963972 : xfs_iunlock(ip, lockmode);
1262 :
1263 118964943 : if (error)
1264 : return error;
1265 118965006 : trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
1266 118964953 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags,
1267 118964953 : shared ? IOMAP_F_SHARED : 0, seq);
1268 : }
1269 :
1270 : const struct iomap_ops xfs_read_iomap_ops = {
1271 : .iomap_begin = xfs_read_iomap_begin,
1272 : };
1273 :
1274 : static int
1275 308015 : xfs_seek_iomap_begin(
1276 : struct inode *inode,
1277 : loff_t offset,
1278 : loff_t length,
1279 : unsigned flags,
1280 : struct iomap *iomap,
1281 : struct iomap *srcmap)
1282 : {
1283 308015 : struct xfs_inode *ip = XFS_I(inode);
1284 308015 : struct xfs_mount *mp = ip->i_mount;
1285 308015 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1286 308015 : xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
1287 308015 : xfs_fileoff_t cow_fsb = NULLFILEOFF, data_fsb = NULLFILEOFF;
1288 308015 : struct xfs_iext_cursor icur;
1289 308015 : struct xfs_bmbt_irec imap, cmap;
1290 308015 : int error = 0;
1291 308015 : unsigned lockmode;
1292 308015 : u64 seq;
1293 :
1294 616030 : if (xfs_is_shutdown(mp))
1295 : return -EIO;
1296 :
1297 308015 : lockmode = xfs_ilock_data_map_shared(ip);
1298 308015 : error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1299 308015 : if (error)
1300 0 : goto out_unlock;
1301 :
1302 308015 : if (xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap)) {
1303 : /*
1304 : * If we found a data extent we are done.
1305 : */
1306 301132 : if (imap.br_startoff <= offset_fsb)
1307 157237 : goto done;
1308 : data_fsb = imap.br_startoff;
1309 : } else {
1310 : /*
1311 : * Fake a hole until the end of the file.
1312 : */
1313 6883 : data_fsb = xfs_iomap_end_fsb(mp, offset, length);
1314 : }
1315 :
1316 : /*
1317 : * If a COW fork extent covers the hole, report it - capped to the next
1318 : * data fork extent:
1319 : */
1320 301855 : if (xfs_inode_has_cow_data(ip) &&
1321 299 : xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &cmap))
1322 299 : cow_fsb = cmap.br_startoff;
1323 150778 : if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
1324 115 : if (data_fsb < cow_fsb + cmap.br_blockcount)
1325 59 : end_fsb = min(end_fsb, data_fsb);
1326 115 : xfs_trim_extent(&cmap, offset_fsb, end_fsb);
1327 115 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED);
1328 115 : error = xfs_bmbt_to_iomap(ip, iomap, &cmap, flags,
1329 : IOMAP_F_SHARED, seq);
1330 : /*
1331 : * This is a COW extent, so we must probe the page cache
1332 : * because there could be dirty page cache being backed
1333 : * by this extent.
1334 : */
1335 115 : iomap->type = IOMAP_UNWRITTEN;
1336 115 : goto out_unlock;
1337 : }
1338 :
1339 : /*
1340 : * Else report a hole, capped to the next found data or COW extent.
1341 : */
1342 150663 : if (cow_fsb != NULLFILEOFF && cow_fsb < data_fsb)
1343 23 : imap.br_blockcount = cow_fsb - offset_fsb;
1344 : else
1345 150640 : imap.br_blockcount = data_fsb - offset_fsb;
1346 150663 : imap.br_startoff = offset_fsb;
1347 150663 : imap.br_startblock = HOLESTARTBLOCK;
1348 150663 : imap.br_state = XFS_EXT_NORM;
1349 307900 : done:
1350 307900 : seq = xfs_iomap_inode_sequence(ip, 0);
1351 307900 : xfs_trim_extent(&imap, offset_fsb, end_fsb);
1352 307900 : error = xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq);
1353 308015 : out_unlock:
1354 308015 : xfs_iunlock(ip, lockmode);
1355 308015 : return error;
1356 : }
1357 :
1358 : const struct iomap_ops xfs_seek_iomap_ops = {
1359 : .iomap_begin = xfs_seek_iomap_begin,
1360 : };
1361 :
1362 : static int
1363 205316 : xfs_xattr_iomap_begin(
1364 : struct inode *inode,
1365 : loff_t offset,
1366 : loff_t length,
1367 : unsigned flags,
1368 : struct iomap *iomap,
1369 : struct iomap *srcmap)
1370 : {
1371 205316 : struct xfs_inode *ip = XFS_I(inode);
1372 205316 : struct xfs_mount *mp = ip->i_mount;
1373 205316 : xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1374 205316 : xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
1375 205316 : struct xfs_bmbt_irec imap;
1376 205316 : int nimaps = 1, error = 0;
1377 205316 : unsigned lockmode;
1378 205316 : int seq;
1379 :
1380 410632 : if (xfs_is_shutdown(mp))
1381 : return -EIO;
1382 :
1383 205316 : lockmode = xfs_ilock_attr_map_shared(ip);
1384 :
1385 : /* if there are no attribute fork or extents, return ENOENT */
1386 205316 : if (!xfs_inode_has_attr_fork(ip) || !ip->i_af.if_nextents) {
1387 201602 : error = -ENOENT;
1388 201602 : goto out_unlock;
1389 : }
1390 :
1391 3714 : ASSERT(ip->i_af.if_format != XFS_DINODE_FMT_LOCAL);
1392 3714 : error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
1393 : &nimaps, XFS_BMAPI_ATTRFORK);
1394 205316 : out_unlock:
1395 :
1396 205316 : seq = xfs_iomap_inode_sequence(ip, IOMAP_F_XATTR);
1397 205316 : xfs_iunlock(ip, lockmode);
1398 :
1399 205316 : if (error)
1400 : return error;
1401 3714 : ASSERT(nimaps);
1402 3714 : return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_XATTR, seq);
1403 : }
1404 :
1405 : const struct iomap_ops xfs_xattr_iomap_ops = {
1406 : .iomap_begin = xfs_xattr_iomap_begin,
1407 : };
1408 :
1409 : int
1410 28081552 : xfs_zero_range(
1411 : struct xfs_inode *ip,
1412 : loff_t pos,
1413 : loff_t len,
1414 : bool *did_zero)
1415 : {
1416 28081552 : struct inode *inode = VFS_I(ip);
1417 :
1418 28081552 : if (IS_DAX(inode))
1419 : return dax_zero_range(inode, pos, len, did_zero,
1420 : &xfs_dax_write_iomap_ops);
1421 28081552 : return iomap_zero_range(inode, pos, len, did_zero,
1422 : &xfs_buffered_write_iomap_ops);
1423 : }
1424 :
1425 : int
1426 2395898 : xfs_truncate_page(
1427 : struct xfs_inode *ip,
1428 : loff_t pos,
1429 : bool *did_zero)
1430 : {
1431 2395898 : struct inode *inode = VFS_I(ip);
1432 :
1433 2395898 : if (IS_DAX(inode))
1434 : return dax_truncate_page(inode, pos, did_zero,
1435 : &xfs_dax_write_iomap_ops);
1436 2395898 : return iomap_truncate_page(inode, pos, did_zero,
1437 : &xfs_buffered_write_iomap_ops);
1438 : }
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