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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_bit.h"
13#include "xfs_mount.h"
14#include "xfs_inode.h"
15#include "xfs_bmap.h"
16#include "xfs_trans.h"
17#include "xfs_rtalloc.h"
18#include "xfs_error.h"
19#include "xfs_rtbitmap.h"
20
21/*
22 * Realtime allocator bitmap functions shared with userspace.
23 */
24
25/*
26 * Real time buffers need verifiers to avoid runtime warnings during IO.
27 * We don't have anything to verify, however, so these are just dummy
28 * operations.
29 */
30static void
31xfs_rtbuf_verify_read(
32 struct xfs_buf *bp)
33{
34 return;
35}
36
37static void
38xfs_rtbuf_verify_write(
39 struct xfs_buf *bp)
40{
41 return;
42}
43
44const struct xfs_buf_ops xfs_rtbuf_ops = {
45 .name = "rtbuf",
46 .verify_read = xfs_rtbuf_verify_read,
47 .verify_write = xfs_rtbuf_verify_write,
48};
49
50/* Release cached rt bitmap and summary buffers. */
51void
52xfs_rtbuf_cache_relse(
53 struct xfs_rtalloc_args *args)
54{
55 if (args->rbmbp) {
56 xfs_trans_brelse(args->tp, args->rbmbp);
57 args->rbmbp = NULL;
58 args->rbmoff = NULLFILEOFF;
59 }
60 if (args->sumbp) {
61 xfs_trans_brelse(args->tp, args->sumbp);
62 args->sumbp = NULL;
63 args->sumoff = NULLFILEOFF;
64 }
65}
66
67/*
68 * Get a buffer for the bitmap or summary file block specified.
69 * The buffer is returned read and locked.
70 */
71int
72xfs_rtbuf_get(
73 struct xfs_rtalloc_args *args,
74 xfs_fileoff_t block, /* block number in bitmap or summary */
75 int issum) /* is summary not bitmap */
76{
77 struct xfs_mount *mp = args->mp;
78 struct xfs_buf **cbpp; /* cached block buffer */
79 xfs_fileoff_t *coffp; /* cached block number */
80 struct xfs_buf *bp; /* block buffer, result */
81 struct xfs_inode *ip; /* bitmap or summary inode */
82 struct xfs_bmbt_irec map;
83 enum xfs_blft type;
84 int nmap = 1;
85 int error;
86
87 if (issum) {
88 cbpp = &args->sumbp;
89 coffp = &args->sumoff;
90 ip = mp->m_rsumip;
91 type = XFS_BLFT_RTSUMMARY_BUF;
92 } else {
93 cbpp = &args->rbmbp;
94 coffp = &args->rbmoff;
95 ip = mp->m_rbmip;
96 type = XFS_BLFT_RTBITMAP_BUF;
97 }
98
99 /*
100 * If we have a cached buffer, and the block number matches, use that.
101 */
102 if (*cbpp && *coffp == block)
103 return 0;
104
105 /*
106 * Otherwise we have to have to get the buffer. If there was an old
107 * one, get rid of it first.
108 */
109 if (*cbpp) {
110 xfs_trans_brelse(args->tp, *cbpp);
111 *cbpp = NULL;
112 }
113
114 error = xfs_bmapi_read(ip, block, 1, &map, &nmap, 0);
115 if (error)
116 return error;
117
118 if (XFS_IS_CORRUPT(mp, nmap == 0 || !xfs_bmap_is_written_extent(&map)))
119 return -EFSCORRUPTED;
120
121 ASSERT(map.br_startblock != NULLFSBLOCK);
122 error = xfs_trans_read_buf(mp, args->tp, mp->m_ddev_targp,
123 XFS_FSB_TO_DADDR(mp, map.br_startblock),
124 mp->m_bsize, 0, &bp, &xfs_rtbuf_ops);
125 if (error)
126 return error;
127
128 xfs_trans_buf_set_type(args->tp, bp, type);
129 *cbpp = bp;
130 *coffp = block;
131 return 0;
132}
133
134/*
135 * Searching backward from start to limit, find the first block whose
136 * allocated/free state is different from start's.
137 */
138int
139xfs_rtfind_back(
140 struct xfs_rtalloc_args *args,
141 xfs_rtxnum_t start, /* starting rtext to look at */
142 xfs_rtxnum_t limit, /* last rtext to look at */
143 xfs_rtxnum_t *rtx) /* out: start rtext found */
144{
145 struct xfs_mount *mp = args->mp;
146 int bit; /* bit number in the word */
147 xfs_fileoff_t block; /* bitmap block number */
148 int error; /* error value */
149 xfs_rtxnum_t firstbit; /* first useful bit in the word */
150 xfs_rtxnum_t i; /* current bit number rel. to start */
151 xfs_rtxnum_t len; /* length of inspected area */
152 xfs_rtword_t mask; /* mask of relevant bits for value */
153 xfs_rtword_t want; /* mask for "good" values */
154 xfs_rtword_t wdiff; /* difference from wanted value */
155 xfs_rtword_t incore;
156 unsigned int word; /* word number in the buffer */
157
158 /*
159 * Compute and read in starting bitmap block for starting block.
160 */
161 block = xfs_rtx_to_rbmblock(mp, start);
162 error = xfs_rtbitmap_read_buf(args, block);
163 if (error)
164 return error;
165
166 /*
167 * Get the first word's index & point to it.
168 */
169 word = xfs_rtx_to_rbmword(mp, start);
170 bit = (int)(start & (XFS_NBWORD - 1));
171 len = start - limit + 1;
172 /*
173 * Compute match value, based on the bit at start: if 1 (free)
174 * then all-ones, else all-zeroes.
175 */
176 incore = xfs_rtbitmap_getword(args, word);
177 want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
178 /*
179 * If the starting position is not word-aligned, deal with the
180 * partial word.
181 */
182 if (bit < XFS_NBWORD - 1) {
183 /*
184 * Calculate first (leftmost) bit number to look at,
185 * and mask for all the relevant bits in this word.
186 */
187 firstbit = max_t(xfs_srtblock_t, bit - len + 1, 0);
188 mask = (((xfs_rtword_t)1 << (bit - firstbit + 1)) - 1) <<
189 firstbit;
190 /*
191 * Calculate the difference between the value there
192 * and what we're looking for.
193 */
194 if ((wdiff = (incore ^ want) & mask)) {
195 /*
196 * Different. Mark where we are and return.
197 */
198 i = bit - xfs_highbit32(wdiff);
199 *rtx = start - i + 1;
200 return 0;
201 }
202 i = bit - firstbit + 1;
203 /*
204 * Go on to previous block if that's where the previous word is
205 * and we need the previous word.
206 */
207 if (--word == -1 && i < len) {
208 /*
209 * If done with this block, get the previous one.
210 */
211 error = xfs_rtbitmap_read_buf(args, --block);
212 if (error)
213 return error;
214
215 word = mp->m_blockwsize - 1;
216 }
217 } else {
218 /*
219 * Starting on a word boundary, no partial word.
220 */
221 i = 0;
222 }
223 /*
224 * Loop over whole words in buffers. When we use up one buffer
225 * we move on to the previous one.
226 */
227 while (len - i >= XFS_NBWORD) {
228 /*
229 * Compute difference between actual and desired value.
230 */
231 incore = xfs_rtbitmap_getword(args, word);
232 if ((wdiff = incore ^ want)) {
233 /*
234 * Different, mark where we are and return.
235 */
236 i += XFS_NBWORD - 1 - xfs_highbit32(wdiff);
237 *rtx = start - i + 1;
238 return 0;
239 }
240 i += XFS_NBWORD;
241 /*
242 * Go on to previous block if that's where the previous word is
243 * and we need the previous word.
244 */
245 if (--word == -1 && i < len) {
246 /*
247 * If done with this block, get the previous one.
248 */
249 error = xfs_rtbitmap_read_buf(args, --block);
250 if (error)
251 return error;
252
253 word = mp->m_blockwsize - 1;
254 }
255 }
256 /*
257 * If not ending on a word boundary, deal with the last
258 * (partial) word.
259 */
260 if (len - i) {
261 /*
262 * Calculate first (leftmost) bit number to look at,
263 * and mask for all the relevant bits in this word.
264 */
265 firstbit = XFS_NBWORD - (len - i);
266 mask = (((xfs_rtword_t)1 << (len - i)) - 1) << firstbit;
267 /*
268 * Compute difference between actual and desired value.
269 */
270 incore = xfs_rtbitmap_getword(args, word);
271 if ((wdiff = (incore ^ want) & mask)) {
272 /*
273 * Different, mark where we are and return.
274 */
275 i += XFS_NBWORD - 1 - xfs_highbit32(wdiff);
276 *rtx = start - i + 1;
277 return 0;
278 } else
279 i = len;
280 }
281 /*
282 * No match, return that we scanned the whole area.
283 */
284 *rtx = start - i + 1;
285 return 0;
286}
287
288/*
289 * Searching forward from start to limit, find the first block whose
290 * allocated/free state is different from start's.
291 */
292int
293xfs_rtfind_forw(
294 struct xfs_rtalloc_args *args,
295 xfs_rtxnum_t start, /* starting rtext to look at */
296 xfs_rtxnum_t limit, /* last rtext to look at */
297 xfs_rtxnum_t *rtx) /* out: start rtext found */
298{
299 struct xfs_mount *mp = args->mp;
300 int bit; /* bit number in the word */
301 xfs_fileoff_t block; /* bitmap block number */
302 int error;
303 xfs_rtxnum_t i; /* current bit number rel. to start */
304 xfs_rtxnum_t lastbit;/* last useful bit in the word */
305 xfs_rtxnum_t len; /* length of inspected area */
306 xfs_rtword_t mask; /* mask of relevant bits for value */
307 xfs_rtword_t want; /* mask for "good" values */
308 xfs_rtword_t wdiff; /* difference from wanted value */
309 xfs_rtword_t incore;
310 unsigned int word; /* word number in the buffer */
311
312 /*
313 * Compute and read in starting bitmap block for starting block.
314 */
315 block = xfs_rtx_to_rbmblock(mp, start);
316 error = xfs_rtbitmap_read_buf(args, block);
317 if (error)
318 return error;
319
320 /*
321 * Get the first word's index & point to it.
322 */
323 word = xfs_rtx_to_rbmword(mp, start);
324 bit = (int)(start & (XFS_NBWORD - 1));
325 len = limit - start + 1;
326 /*
327 * Compute match value, based on the bit at start: if 1 (free)
328 * then all-ones, else all-zeroes.
329 */
330 incore = xfs_rtbitmap_getword(args, word);
331 want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
332 /*
333 * If the starting position is not word-aligned, deal with the
334 * partial word.
335 */
336 if (bit) {
337 /*
338 * Calculate last (rightmost) bit number to look at,
339 * and mask for all the relevant bits in this word.
340 */
341 lastbit = min(bit + len, XFS_NBWORD);
342 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
343 /*
344 * Calculate the difference between the value there
345 * and what we're looking for.
346 */
347 if ((wdiff = (incore ^ want) & mask)) {
348 /*
349 * Different. Mark where we are and return.
350 */
351 i = xfs_lowbit32(wdiff) - bit;
352 *rtx = start + i - 1;
353 return 0;
354 }
355 i = lastbit - bit;
356 /*
357 * Go on to next block if that's where the next word is
358 * and we need the next word.
359 */
360 if (++word == mp->m_blockwsize && i < len) {
361 /*
362 * If done with this block, get the previous one.
363 */
364 error = xfs_rtbitmap_read_buf(args, ++block);
365 if (error)
366 return error;
367
368 word = 0;
369 }
370 } else {
371 /*
372 * Starting on a word boundary, no partial word.
373 */
374 i = 0;
375 }
376 /*
377 * Loop over whole words in buffers. When we use up one buffer
378 * we move on to the next one.
379 */
380 while (len - i >= XFS_NBWORD) {
381 /*
382 * Compute difference between actual and desired value.
383 */
384 incore = xfs_rtbitmap_getword(args, word);
385 if ((wdiff = incore ^ want)) {
386 /*
387 * Different, mark where we are and return.
388 */
389 i += xfs_lowbit32(wdiff);
390 *rtx = start + i - 1;
391 return 0;
392 }
393 i += XFS_NBWORD;
394 /*
395 * Go on to next block if that's where the next word is
396 * and we need the next word.
397 */
398 if (++word == mp->m_blockwsize && i < len) {
399 /*
400 * If done with this block, get the next one.
401 */
402 error = xfs_rtbitmap_read_buf(args, ++block);
403 if (error)
404 return error;
405
406 word = 0;
407 }
408 }
409 /*
410 * If not ending on a word boundary, deal with the last
411 * (partial) word.
412 */
413 if ((lastbit = len - i)) {
414 /*
415 * Calculate mask for all the relevant bits in this word.
416 */
417 mask = ((xfs_rtword_t)1 << lastbit) - 1;
418 /*
419 * Compute difference between actual and desired value.
420 */
421 incore = xfs_rtbitmap_getword(args, word);
422 if ((wdiff = (incore ^ want) & mask)) {
423 /*
424 * Different, mark where we are and return.
425 */
426 i += xfs_lowbit32(wdiff);
427 *rtx = start + i - 1;
428 return 0;
429 } else
430 i = len;
431 }
432 /*
433 * No match, return that we scanned the whole area.
434 */
435 *rtx = start + i - 1;
436 return 0;
437}
438
439/* Log rtsummary counter at @infoword. */
440static inline void
441xfs_trans_log_rtsummary(
442 struct xfs_rtalloc_args *args,
443 unsigned int infoword)
444{
445 struct xfs_buf *bp = args->sumbp;
446 size_t first, last;
447
448 first = (void *)xfs_rsumblock_infoptr(args, infoword) - bp->b_addr;
449 last = first + sizeof(xfs_suminfo_t) - 1;
450
451 xfs_trans_log_buf(args->tp, bp, first, last);
452}
453
454/*
455 * Modify the summary information for a given extent size, bitmap block
456 * combination.
457 */
458int
459xfs_rtmodify_summary(
460 struct xfs_rtalloc_args *args,
461 int log, /* log2 of extent size */
462 xfs_fileoff_t bbno, /* bitmap block number */
463 int delta) /* in/out: summary block number */
464{
465 struct xfs_mount *mp = args->mp;
466 xfs_rtsumoff_t so = xfs_rtsumoffs(mp, log, bbno);
467 unsigned int infoword;
468 xfs_suminfo_t val;
469 int error;
470
471 error = xfs_rtsummary_read_buf(args, xfs_rtsumoffs_to_block(mp, so));
472 if (error)
473 return error;
474
475 infoword = xfs_rtsumoffs_to_infoword(mp, so);
476 val = xfs_suminfo_add(args, infoword, delta);
477
478 if (mp->m_rsum_cache) {
479 if (val == 0 && log + 1 == mp->m_rsum_cache[bbno])
480 mp->m_rsum_cache[bbno] = log;
481 if (val != 0 && log >= mp->m_rsum_cache[bbno])
482 mp->m_rsum_cache[bbno] = log + 1;
483 }
484
485 xfs_trans_log_rtsummary(args, infoword);
486 return 0;
487}
488
489/*
490 * Read and return the summary information for a given extent size, bitmap block
491 * combination.
492 */
493int
494xfs_rtget_summary(
495 struct xfs_rtalloc_args *args,
496 int log, /* log2 of extent size */
497 xfs_fileoff_t bbno, /* bitmap block number */
498 xfs_suminfo_t *sum) /* out: summary info for this block */
499{
500 struct xfs_mount *mp = args->mp;
501 xfs_rtsumoff_t so = xfs_rtsumoffs(mp, log, bbno);
502 int error;
503
504 error = xfs_rtsummary_read_buf(args, xfs_rtsumoffs_to_block(mp, so));
505 if (!error)
506 *sum = xfs_suminfo_get(args, xfs_rtsumoffs_to_infoword(mp, so));
507 return error;
508}
509
510/* Log rtbitmap block from the word @from to the byte before @next. */
511static inline void
512xfs_trans_log_rtbitmap(
513 struct xfs_rtalloc_args *args,
514 unsigned int from,
515 unsigned int next)
516{
517 struct xfs_buf *bp = args->rbmbp;
518 size_t first, last;
519
520 first = (void *)xfs_rbmblock_wordptr(args, from) - bp->b_addr;
521 last = ((void *)xfs_rbmblock_wordptr(args, next) - 1) - bp->b_addr;
522
523 xfs_trans_log_buf(args->tp, bp, first, last);
524}
525
526/*
527 * Set the given range of bitmap bits to the given value.
528 * Do whatever I/O and logging is required.
529 */
530int
531xfs_rtmodify_range(
532 struct xfs_rtalloc_args *args,
533 xfs_rtxnum_t start, /* starting rtext to modify */
534 xfs_rtxlen_t len, /* length of extent to modify */
535 int val) /* 1 for free, 0 for allocated */
536{
537 struct xfs_mount *mp = args->mp;
538 int bit; /* bit number in the word */
539 xfs_fileoff_t block; /* bitmap block number */
540 int error;
541 int i; /* current bit number rel. to start */
542 int lastbit; /* last useful bit in word */
543 xfs_rtword_t mask; /* mask of relevant bits for value */
544 xfs_rtword_t incore;
545 unsigned int firstword; /* first word used in the buffer */
546 unsigned int word; /* word number in the buffer */
547
548 /*
549 * Compute starting bitmap block number.
550 */
551 block = xfs_rtx_to_rbmblock(mp, start);
552 /*
553 * Read the bitmap block, and point to its data.
554 */
555 error = xfs_rtbitmap_read_buf(args, block);
556 if (error)
557 return error;
558
559 /*
560 * Compute the starting word's address, and starting bit.
561 */
562 firstword = word = xfs_rtx_to_rbmword(mp, start);
563 bit = (int)(start & (XFS_NBWORD - 1));
564 /*
565 * 0 (allocated) => all zeroes; 1 (free) => all ones.
566 */
567 val = -val;
568 /*
569 * If not starting on a word boundary, deal with the first
570 * (partial) word.
571 */
572 if (bit) {
573 /*
574 * Compute first bit not changed and mask of relevant bits.
575 */
576 lastbit = min(bit + len, XFS_NBWORD);
577 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
578 /*
579 * Set/clear the active bits.
580 */
581 incore = xfs_rtbitmap_getword(args, word);
582 if (val)
583 incore |= mask;
584 else
585 incore &= ~mask;
586 xfs_rtbitmap_setword(args, word, incore);
587 i = lastbit - bit;
588 /*
589 * Go on to the next block if that's where the next word is
590 * and we need the next word.
591 */
592 if (++word == mp->m_blockwsize && i < len) {
593 /*
594 * Log the changed part of this block.
595 * Get the next one.
596 */
597 xfs_trans_log_rtbitmap(args, firstword, word);
598 error = xfs_rtbitmap_read_buf(args, ++block);
599 if (error)
600 return error;
601
602 firstword = word = 0;
603 }
604 } else {
605 /*
606 * Starting on a word boundary, no partial word.
607 */
608 i = 0;
609 }
610 /*
611 * Loop over whole words in buffers. When we use up one buffer
612 * we move on to the next one.
613 */
614 while (len - i >= XFS_NBWORD) {
615 /*
616 * Set the word value correctly.
617 */
618 xfs_rtbitmap_setword(args, word, val);
619 i += XFS_NBWORD;
620 /*
621 * Go on to the next block if that's where the next word is
622 * and we need the next word.
623 */
624 if (++word == mp->m_blockwsize && i < len) {
625 /*
626 * Log the changed part of this block.
627 * Get the next one.
628 */
629 xfs_trans_log_rtbitmap(args, firstword, word);
630 error = xfs_rtbitmap_read_buf(args, ++block);
631 if (error)
632 return error;
633
634 firstword = word = 0;
635 }
636 }
637 /*
638 * If not ending on a word boundary, deal with the last
639 * (partial) word.
640 */
641 if ((lastbit = len - i)) {
642 /*
643 * Compute a mask of relevant bits.
644 */
645 mask = ((xfs_rtword_t)1 << lastbit) - 1;
646 /*
647 * Set/clear the active bits.
648 */
649 incore = xfs_rtbitmap_getword(args, word);
650 if (val)
651 incore |= mask;
652 else
653 incore &= ~mask;
654 xfs_rtbitmap_setword(args, word, incore);
655 word++;
656 }
657 /*
658 * Log any remaining changed bytes.
659 */
660 if (word > firstword)
661 xfs_trans_log_rtbitmap(args, firstword, word);
662 return 0;
663}
664
665/*
666 * Mark an extent specified by start and len freed.
667 * Updates all the summary information as well as the bitmap.
668 */
669int
670xfs_rtfree_range(
671 struct xfs_rtalloc_args *args,
672 xfs_rtxnum_t start, /* starting rtext to free */
673 xfs_rtxlen_t len) /* in/out: summary block number */
674{
675 struct xfs_mount *mp = args->mp;
676 xfs_rtxnum_t end; /* end of the freed extent */
677 int error; /* error value */
678 xfs_rtxnum_t postblock; /* first rtext freed > end */
679 xfs_rtxnum_t preblock; /* first rtext freed < start */
680
681 end = start + len - 1;
682 /*
683 * Modify the bitmap to mark this extent freed.
684 */
685 error = xfs_rtmodify_range(args, start, len, 1);
686 if (error) {
687 return error;
688 }
689 /*
690 * Assume we're freeing out of the middle of an allocated extent.
691 * We need to find the beginning and end of the extent so we can
692 * properly update the summary.
693 */
694 error = xfs_rtfind_back(args, start, 0, &preblock);
695 if (error) {
696 return error;
697 }
698 /*
699 * Find the next allocated block (end of allocated extent).
700 */
701 error = xfs_rtfind_forw(args, end, mp->m_sb.sb_rextents - 1,
702 &postblock);
703 if (error)
704 return error;
705 /*
706 * If there are blocks not being freed at the front of the
707 * old extent, add summary data for them to be allocated.
708 */
709 if (preblock < start) {
710 error = xfs_rtmodify_summary(args,
711 xfs_highbit64(start - preblock),
712 xfs_rtx_to_rbmblock(mp, preblock), -1);
713 if (error) {
714 return error;
715 }
716 }
717 /*
718 * If there are blocks not being freed at the end of the
719 * old extent, add summary data for them to be allocated.
720 */
721 if (postblock > end) {
722 error = xfs_rtmodify_summary(args,
723 xfs_highbit64(postblock - end),
724 xfs_rtx_to_rbmblock(mp, end + 1), -1);
725 if (error) {
726 return error;
727 }
728 }
729 /*
730 * Increment the summary information corresponding to the entire
731 * (new) free extent.
732 */
733 return xfs_rtmodify_summary(args,
734 xfs_highbit64(postblock + 1 - preblock),
735 xfs_rtx_to_rbmblock(mp, preblock), 1);
736}
737
738/*
739 * Check that the given range is either all allocated (val = 0) or
740 * all free (val = 1).
741 */
742int
743xfs_rtcheck_range(
744 struct xfs_rtalloc_args *args,
745 xfs_rtxnum_t start, /* starting rtext number of extent */
746 xfs_rtxlen_t len, /* length of extent */
747 int val, /* 1 for free, 0 for allocated */
748 xfs_rtxnum_t *new, /* out: first rtext not matching */
749 int *stat) /* out: 1 for matches, 0 for not */
750{
751 struct xfs_mount *mp = args->mp;
752 int bit; /* bit number in the word */
753 xfs_fileoff_t block; /* bitmap block number */
754 int error;
755 xfs_rtxnum_t i; /* current bit number rel. to start */
756 xfs_rtxnum_t lastbit; /* last useful bit in word */
757 xfs_rtword_t mask; /* mask of relevant bits for value */
758 xfs_rtword_t wdiff; /* difference from wanted value */
759 xfs_rtword_t incore;
760 unsigned int word; /* word number in the buffer */
761
762 /*
763 * Compute starting bitmap block number
764 */
765 block = xfs_rtx_to_rbmblock(mp, start);
766 /*
767 * Read the bitmap block.
768 */
769 error = xfs_rtbitmap_read_buf(args, block);
770 if (error)
771 return error;
772
773 /*
774 * Compute the starting word's address, and starting bit.
775 */
776 word = xfs_rtx_to_rbmword(mp, start);
777 bit = (int)(start & (XFS_NBWORD - 1));
778 /*
779 * 0 (allocated) => all zero's; 1 (free) => all one's.
780 */
781 val = -val;
782 /*
783 * If not starting on a word boundary, deal with the first
784 * (partial) word.
785 */
786 if (bit) {
787 /*
788 * Compute first bit not examined.
789 */
790 lastbit = min(bit + len, XFS_NBWORD);
791 /*
792 * Mask of relevant bits.
793 */
794 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
795 /*
796 * Compute difference between actual and desired value.
797 */
798 incore = xfs_rtbitmap_getword(args, word);
799 if ((wdiff = (incore ^ val) & mask)) {
800 /*
801 * Different, compute first wrong bit and return.
802 */
803 i = xfs_lowbit32(wdiff) - bit;
804 *new = start + i;
805 *stat = 0;
806 return 0;
807 }
808 i = lastbit - bit;
809 /*
810 * Go on to next block if that's where the next word is
811 * and we need the next word.
812 */
813 if (++word == mp->m_blockwsize && i < len) {
814 /*
815 * If done with this block, get the next one.
816 */
817 error = xfs_rtbitmap_read_buf(args, ++block);
818 if (error)
819 return error;
820
821 word = 0;
822 }
823 } else {
824 /*
825 * Starting on a word boundary, no partial word.
826 */
827 i = 0;
828 }
829 /*
830 * Loop over whole words in buffers. When we use up one buffer
831 * we move on to the next one.
832 */
833 while (len - i >= XFS_NBWORD) {
834 /*
835 * Compute difference between actual and desired value.
836 */
837 incore = xfs_rtbitmap_getword(args, word);
838 if ((wdiff = incore ^ val)) {
839 /*
840 * Different, compute first wrong bit and return.
841 */
842 i += xfs_lowbit32(wdiff);
843 *new = start + i;
844 *stat = 0;
845 return 0;
846 }
847 i += XFS_NBWORD;
848 /*
849 * Go on to next block if that's where the next word is
850 * and we need the next word.
851 */
852 if (++word == mp->m_blockwsize && i < len) {
853 /*
854 * If done with this block, get the next one.
855 */
856 error = xfs_rtbitmap_read_buf(args, ++block);
857 if (error)
858 return error;
859
860 word = 0;
861 }
862 }
863 /*
864 * If not ending on a word boundary, deal with the last
865 * (partial) word.
866 */
867 if ((lastbit = len - i)) {
868 /*
869 * Mask of relevant bits.
870 */
871 mask = ((xfs_rtword_t)1 << lastbit) - 1;
872 /*
873 * Compute difference between actual and desired value.
874 */
875 incore = xfs_rtbitmap_getword(args, word);
876 if ((wdiff = (incore ^ val) & mask)) {
877 /*
878 * Different, compute first wrong bit and return.
879 */
880 i += xfs_lowbit32(wdiff);
881 *new = start + i;
882 *stat = 0;
883 return 0;
884 } else
885 i = len;
886 }
887 /*
888 * Successful, return.
889 */
890 *new = start + i;
891 *stat = 1;
892 return 0;
893}
894
895#ifdef DEBUG
896/*
897 * Check that the given extent (block range) is allocated already.
898 */
899STATIC int
900xfs_rtcheck_alloc_range(
901 struct xfs_rtalloc_args *args,
902 xfs_rtxnum_t start, /* starting rtext number of extent */
903 xfs_rtxlen_t len) /* length of extent */
904{
905 xfs_rtxnum_t new; /* dummy for xfs_rtcheck_range */
906 int stat;
907 int error;
908
909 error = xfs_rtcheck_range(args, start, len, 0, &new, &stat);
910 if (error)
911 return error;
912 ASSERT(stat);
913 return 0;
914}
915#else
916#define xfs_rtcheck_alloc_range(a,b,l) (0)
917#endif
918/*
919 * Free an extent in the realtime subvolume. Length is expressed in
920 * realtime extents, as is the block number.
921 */
922int
923xfs_rtfree_extent(
924 struct xfs_trans *tp, /* transaction pointer */
925 xfs_rtxnum_t start, /* starting rtext number to free */
926 xfs_rtxlen_t len) /* length of extent freed */
927{
928 struct xfs_mount *mp = tp->t_mountp;
929 struct xfs_rtalloc_args args = {
930 .mp = mp,
931 .tp = tp,
932 };
933 int error;
934 struct timespec64 atime;
935
936 ASSERT(mp->m_rbmip->i_itemp != NULL);
937 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
938
939 error = xfs_rtcheck_alloc_range(&args, start, len);
940 if (error)
941 return error;
942
943 /*
944 * Free the range of realtime blocks.
945 */
946 error = xfs_rtfree_range(&args, start, len);
947 if (error)
948 goto out;
949
950 /*
951 * Mark more blocks free in the superblock.
952 */
953 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, (long)len);
954 /*
955 * If we've now freed all the blocks, reset the file sequence
956 * number to 0.
957 */
958 if (tp->t_frextents_delta + mp->m_sb.sb_frextents ==
959 mp->m_sb.sb_rextents) {
960 if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM))
961 mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
962
963 atime = inode_get_atime(VFS_I(mp->m_rbmip));
964 atime.tv_sec = 0;
965 inode_set_atime_to_ts(VFS_I(mp->m_rbmip), atime);
966 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
967 }
968 error = 0;
969out:
970 xfs_rtbuf_cache_relse(&args);
971 return error;
972}
973
974/*
975 * Free some blocks in the realtime subvolume. rtbno and rtlen are in units of
976 * rt blocks, not rt extents; must be aligned to the rt extent size; and rtlen
977 * cannot exceed XFS_MAX_BMBT_EXTLEN.
978 */
979int
980xfs_rtfree_blocks(
981 struct xfs_trans *tp,
982 xfs_fsblock_t rtbno,
983 xfs_filblks_t rtlen)
984{
985 struct xfs_mount *mp = tp->t_mountp;
986 xfs_rtxnum_t start;
987 xfs_filblks_t len;
988 xfs_extlen_t mod;
989
990 ASSERT(rtlen <= XFS_MAX_BMBT_EXTLEN);
991
992 len = xfs_rtb_to_rtxrem(mp, rtlen, &mod);
993 if (mod) {
994 ASSERT(mod == 0);
995 return -EIO;
996 }
997
998 start = xfs_rtb_to_rtxrem(mp, rtbno, &mod);
999 if (mod) {
1000 ASSERT(mod == 0);
1001 return -EIO;
1002 }
1003
1004 return xfs_rtfree_extent(tp, start, len);
1005}
1006
1007/* Find all the free records within a given range. */
1008int
1009xfs_rtalloc_query_range(
1010 struct xfs_mount *mp,
1011 struct xfs_trans *tp,
1012 const struct xfs_rtalloc_rec *low_rec,
1013 const struct xfs_rtalloc_rec *high_rec,
1014 xfs_rtalloc_query_range_fn fn,
1015 void *priv)
1016{
1017 struct xfs_rtalloc_args args = {
1018 .mp = mp,
1019 .tp = tp,
1020 };
1021 struct xfs_rtalloc_rec rec;
1022 xfs_rtxnum_t rtstart;
1023 xfs_rtxnum_t rtend;
1024 xfs_rtxnum_t high_key;
1025 int is_free;
1026 int error = 0;
1027
1028 if (low_rec->ar_startext > high_rec->ar_startext)
1029 return -EINVAL;
1030 if (low_rec->ar_startext >= mp->m_sb.sb_rextents ||
1031 low_rec->ar_startext == high_rec->ar_startext)
1032 return 0;
1033
1034 high_key = min(high_rec->ar_startext, mp->m_sb.sb_rextents - 1);
1035
1036 /* Iterate the bitmap, looking for discrepancies. */
1037 rtstart = low_rec->ar_startext;
1038 while (rtstart <= high_key) {
1039 /* Is the first block free? */
1040 error = xfs_rtcheck_range(&args, rtstart, 1, 1, &rtend,
1041 &is_free);
1042 if (error)
1043 break;
1044
1045 /* How long does the extent go for? */
1046 error = xfs_rtfind_forw(&args, rtstart, high_key, &rtend);
1047 if (error)
1048 break;
1049
1050 if (is_free) {
1051 rec.ar_startext = rtstart;
1052 rec.ar_extcount = rtend - rtstart + 1;
1053
1054 error = fn(mp, tp, &rec, priv);
1055 if (error)
1056 break;
1057 }
1058
1059 rtstart = rtend + 1;
1060 }
1061
1062 xfs_rtbuf_cache_relse(&args);
1063 return error;
1064}
1065
1066/* Find all the free records. */
1067int
1068xfs_rtalloc_query_all(
1069 struct xfs_mount *mp,
1070 struct xfs_trans *tp,
1071 xfs_rtalloc_query_range_fn fn,
1072 void *priv)
1073{
1074 struct xfs_rtalloc_rec keys[2];
1075
1076 keys[0].ar_startext = 0;
1077 keys[1].ar_startext = mp->m_sb.sb_rextents - 1;
1078 keys[0].ar_extcount = keys[1].ar_extcount = 0;
1079
1080 return xfs_rtalloc_query_range(mp, tp, &keys[0], &keys[1], fn, priv);
1081}
1082
1083/* Is the given extent all free? */
1084int
1085xfs_rtalloc_extent_is_free(
1086 struct xfs_mount *mp,
1087 struct xfs_trans *tp,
1088 xfs_rtxnum_t start,
1089 xfs_rtxlen_t len,
1090 bool *is_free)
1091{
1092 struct xfs_rtalloc_args args = {
1093 .mp = mp,
1094 .tp = tp,
1095 };
1096 xfs_rtxnum_t end;
1097 int matches;
1098 int error;
1099
1100 error = xfs_rtcheck_range(&args, start, len, 1, &end, &matches);
1101 xfs_rtbuf_cache_relse(&args);
1102 if (error)
1103 return error;
1104
1105 *is_free = matches;
1106 return 0;
1107}
1108
1109/*
1110 * Compute the number of rtbitmap blocks needed to track the given number of rt
1111 * extents.
1112 */
1113xfs_filblks_t
1114xfs_rtbitmap_blockcount(
1115 struct xfs_mount *mp,
1116 xfs_rtbxlen_t rtextents)
1117{
1118 return howmany_64(rtextents, NBBY * mp->m_sb.sb_blocksize);
1119}
1120
1121/*
1122 * Compute the number of rtbitmap words needed to populate every block of a
1123 * bitmap that is large enough to track the given number of rt extents.
1124 */
1125unsigned long long
1126xfs_rtbitmap_wordcount(
1127 struct xfs_mount *mp,
1128 xfs_rtbxlen_t rtextents)
1129{
1130 xfs_filblks_t blocks;
1131
1132 blocks = xfs_rtbitmap_blockcount(mp, rtextents);
1133 return XFS_FSB_TO_B(mp, blocks) >> XFS_WORDLOG;
1134}
1135
1136/* Compute the number of rtsummary blocks needed to track the given rt space. */
1137xfs_filblks_t
1138xfs_rtsummary_blockcount(
1139 struct xfs_mount *mp,
1140 unsigned int rsumlevels,
1141 xfs_extlen_t rbmblocks)
1142{
1143 unsigned long long rsumwords;
1144
1145 rsumwords = (unsigned long long)rsumlevels * rbmblocks;
1146 return XFS_B_TO_FSB(mp, rsumwords << XFS_WORDLOG);
1147}
1148
1149/*
1150 * Compute the number of rtsummary info words needed to populate every block of
1151 * a summary file that is large enough to track the given rt space.
1152 */
1153unsigned long long
1154xfs_rtsummary_wordcount(
1155 struct xfs_mount *mp,
1156 unsigned int rsumlevels,
1157 xfs_extlen_t rbmblocks)
1158{
1159 xfs_filblks_t blocks;
1160
1161 blocks = xfs_rtsummary_blockcount(mp, rsumlevels, rbmblocks);
1162 return XFS_FSB_TO_B(mp, blocks) >> XFS_WORDLOG;
1163}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_bit.h"
13#include "xfs_mount.h"
14#include "xfs_inode.h"
15#include "xfs_bmap.h"
16#include "xfs_bmap_btree.h"
17#include "xfs_trans_space.h"
18#include "xfs_trans.h"
19#include "xfs_rtalloc.h"
20#include "xfs_error.h"
21#include "xfs_rtbitmap.h"
22#include "xfs_health.h"
23#include "xfs_sb.h"
24#include "xfs_errortag.h"
25#include "xfs_log.h"
26#include "xfs_buf_item.h"
27#include "xfs_extent_busy.h"
28
29/*
30 * Realtime allocator bitmap functions shared with userspace.
31 */
32
33static xfs_failaddr_t
34xfs_rtbuf_verify(
35 struct xfs_buf *bp)
36{
37 struct xfs_mount *mp = bp->b_mount;
38 struct xfs_rtbuf_blkinfo *hdr = bp->b_addr;
39
40 if (!xfs_verify_magic(bp, hdr->rt_magic))
41 return __this_address;
42 if (!xfs_has_rtgroups(mp))
43 return __this_address;
44 if (!xfs_has_crc(mp))
45 return __this_address;
46 if (!uuid_equal(&hdr->rt_uuid, &mp->m_sb.sb_meta_uuid))
47 return __this_address;
48 if (hdr->rt_blkno != cpu_to_be64(xfs_buf_daddr(bp)))
49 return __this_address;
50 return NULL;
51}
52
53static void
54xfs_rtbuf_verify_read(
55 struct xfs_buf *bp)
56{
57 struct xfs_mount *mp = bp->b_mount;
58 struct xfs_rtbuf_blkinfo *hdr = bp->b_addr;
59 xfs_failaddr_t fa;
60
61 if (!xfs_has_rtgroups(mp))
62 return;
63
64 if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr->rt_lsn))) {
65 fa = __this_address;
66 goto fail;
67 }
68
69 if (!xfs_buf_verify_cksum(bp, XFS_RTBUF_CRC_OFF)) {
70 fa = __this_address;
71 goto fail;
72 }
73
74 fa = xfs_rtbuf_verify(bp);
75 if (fa)
76 goto fail;
77
78 return;
79fail:
80 xfs_verifier_error(bp, -EFSCORRUPTED, fa);
81}
82
83static void
84xfs_rtbuf_verify_write(
85 struct xfs_buf *bp)
86{
87 struct xfs_mount *mp = bp->b_mount;
88 struct xfs_rtbuf_blkinfo *hdr = bp->b_addr;
89 struct xfs_buf_log_item *bip = bp->b_log_item;
90 xfs_failaddr_t fa;
91
92 if (!xfs_has_rtgroups(mp))
93 return;
94
95 fa = xfs_rtbuf_verify(bp);
96 if (fa) {
97 xfs_verifier_error(bp, -EFSCORRUPTED, fa);
98 return;
99 }
100
101 if (bip)
102 hdr->rt_lsn = cpu_to_be64(bip->bli_item.li_lsn);
103 xfs_buf_update_cksum(bp, XFS_RTBUF_CRC_OFF);
104}
105
106const struct xfs_buf_ops xfs_rtbuf_ops = {
107 .name = "rtbuf",
108 .verify_read = xfs_rtbuf_verify_read,
109 .verify_write = xfs_rtbuf_verify_write,
110};
111
112const struct xfs_buf_ops xfs_rtbitmap_buf_ops = {
113 .name = "xfs_rtbitmap",
114 .magic = { 0, cpu_to_be32(XFS_RTBITMAP_MAGIC) },
115 .verify_read = xfs_rtbuf_verify_read,
116 .verify_write = xfs_rtbuf_verify_write,
117 .verify_struct = xfs_rtbuf_verify,
118};
119
120const struct xfs_buf_ops xfs_rtsummary_buf_ops = {
121 .name = "xfs_rtsummary",
122 .magic = { 0, cpu_to_be32(XFS_RTSUMMARY_MAGIC) },
123 .verify_read = xfs_rtbuf_verify_read,
124 .verify_write = xfs_rtbuf_verify_write,
125 .verify_struct = xfs_rtbuf_verify,
126};
127
128/* Release cached rt bitmap and summary buffers. */
129void
130xfs_rtbuf_cache_relse(
131 struct xfs_rtalloc_args *args)
132{
133 if (args->rbmbp) {
134 xfs_trans_brelse(args->tp, args->rbmbp);
135 args->rbmbp = NULL;
136 args->rbmoff = NULLFILEOFF;
137 }
138 if (args->sumbp) {
139 xfs_trans_brelse(args->tp, args->sumbp);
140 args->sumbp = NULL;
141 args->sumoff = NULLFILEOFF;
142 }
143}
144
145/*
146 * Get a buffer for the bitmap or summary file block specified.
147 * The buffer is returned read and locked.
148 */
149static int
150xfs_rtbuf_get(
151 struct xfs_rtalloc_args *args,
152 xfs_fileoff_t block, /* block number in bitmap or summary */
153 enum xfs_rtg_inodes type)
154{
155 struct xfs_inode *ip = args->rtg->rtg_inodes[type];
156 struct xfs_mount *mp = args->mp;
157 struct xfs_buf **cbpp; /* cached block buffer */
158 xfs_fileoff_t *coffp; /* cached block number */
159 struct xfs_buf *bp; /* block buffer, result */
160 struct xfs_bmbt_irec map;
161 enum xfs_blft buf_type;
162 int nmap = 1;
163 int error;
164
165 switch (type) {
166 case XFS_RTGI_SUMMARY:
167 cbpp = &args->sumbp;
168 coffp = &args->sumoff;
169 buf_type = XFS_BLFT_RTSUMMARY_BUF;
170 break;
171 case XFS_RTGI_BITMAP:
172 cbpp = &args->rbmbp;
173 coffp = &args->rbmoff;
174 buf_type = XFS_BLFT_RTBITMAP_BUF;
175 break;
176 default:
177 return -EINVAL;
178 }
179
180 /*
181 * If we have a cached buffer, and the block number matches, use that.
182 */
183 if (*cbpp && *coffp == block)
184 return 0;
185
186 /*
187 * Otherwise we have to have to get the buffer. If there was an old
188 * one, get rid of it first.
189 */
190 if (*cbpp) {
191 xfs_trans_brelse(args->tp, *cbpp);
192 *cbpp = NULL;
193 }
194
195 error = xfs_bmapi_read(ip, block, 1, &map, &nmap, 0);
196 if (error)
197 return error;
198
199 if (XFS_IS_CORRUPT(mp, nmap == 0 || !xfs_bmap_is_written_extent(&map))) {
200 xfs_rtginode_mark_sick(args->rtg, type);
201 return -EFSCORRUPTED;
202 }
203
204 ASSERT(map.br_startblock != NULLFSBLOCK);
205 error = xfs_trans_read_buf(mp, args->tp, mp->m_ddev_targp,
206 XFS_FSB_TO_DADDR(mp, map.br_startblock),
207 mp->m_bsize, 0, &bp,
208 xfs_rtblock_ops(mp, type));
209 if (xfs_metadata_is_sick(error))
210 xfs_rtginode_mark_sick(args->rtg, type);
211 if (error)
212 return error;
213
214 if (xfs_has_rtgroups(mp)) {
215 struct xfs_rtbuf_blkinfo *hdr = bp->b_addr;
216
217 if (hdr->rt_owner != cpu_to_be64(ip->i_ino)) {
218 xfs_buf_mark_corrupt(bp);
219 xfs_trans_brelse(args->tp, bp);
220 xfs_rtginode_mark_sick(args->rtg, type);
221 return -EFSCORRUPTED;
222 }
223 }
224
225 xfs_trans_buf_set_type(args->tp, bp, buf_type);
226 *cbpp = bp;
227 *coffp = block;
228 return 0;
229}
230
231int
232xfs_rtbitmap_read_buf(
233 struct xfs_rtalloc_args *args,
234 xfs_fileoff_t block)
235{
236 struct xfs_mount *mp = args->mp;
237
238 if (XFS_IS_CORRUPT(mp, block >= mp->m_sb.sb_rbmblocks)) {
239 xfs_rtginode_mark_sick(args->rtg, XFS_RTGI_BITMAP);
240 return -EFSCORRUPTED;
241 }
242
243 return xfs_rtbuf_get(args, block, XFS_RTGI_BITMAP);
244}
245
246int
247xfs_rtsummary_read_buf(
248 struct xfs_rtalloc_args *args,
249 xfs_fileoff_t block)
250{
251 struct xfs_mount *mp = args->mp;
252
253 if (XFS_IS_CORRUPT(mp, block >= mp->m_rsumblocks)) {
254 xfs_rtginode_mark_sick(args->rtg, XFS_RTGI_SUMMARY);
255 return -EFSCORRUPTED;
256 }
257 return xfs_rtbuf_get(args, block, XFS_RTGI_SUMMARY);
258}
259
260/*
261 * Searching backward from start find the first block whose allocated/free state
262 * is different from start's.
263 */
264int
265xfs_rtfind_back(
266 struct xfs_rtalloc_args *args,
267 xfs_rtxnum_t start, /* starting rtext to look at */
268 xfs_rtxnum_t *rtx) /* out: start rtext found */
269{
270 struct xfs_mount *mp = args->mp;
271 int bit; /* bit number in the word */
272 xfs_fileoff_t block; /* bitmap block number */
273 int error; /* error value */
274 xfs_rtxnum_t firstbit; /* first useful bit in the word */
275 xfs_rtxnum_t i; /* current bit number rel. to start */
276 xfs_rtxnum_t len; /* length of inspected area */
277 xfs_rtword_t mask; /* mask of relevant bits for value */
278 xfs_rtword_t want; /* mask for "good" values */
279 xfs_rtword_t wdiff; /* difference from wanted value */
280 xfs_rtword_t incore;
281 unsigned int word; /* word number in the buffer */
282
283 /*
284 * Compute and read in starting bitmap block for starting block.
285 */
286 block = xfs_rtx_to_rbmblock(mp, start);
287 error = xfs_rtbitmap_read_buf(args, block);
288 if (error)
289 return error;
290
291 /*
292 * Get the first word's index & point to it.
293 */
294 word = xfs_rtx_to_rbmword(mp, start);
295 bit = (int)(start & (XFS_NBWORD - 1));
296 len = start + 1;
297 /*
298 * Compute match value, based on the bit at start: if 1 (free)
299 * then all-ones, else all-zeroes.
300 */
301 incore = xfs_rtbitmap_getword(args, word);
302 want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
303 /*
304 * If the starting position is not word-aligned, deal with the
305 * partial word.
306 */
307 if (bit < XFS_NBWORD - 1) {
308 /*
309 * Calculate first (leftmost) bit number to look at,
310 * and mask for all the relevant bits in this word.
311 */
312 firstbit = max_t(xfs_srtblock_t, bit - len + 1, 0);
313 mask = (((xfs_rtword_t)1 << (bit - firstbit + 1)) - 1) <<
314 firstbit;
315 /*
316 * Calculate the difference between the value there
317 * and what we're looking for.
318 */
319 if ((wdiff = (incore ^ want) & mask)) {
320 /*
321 * Different. Mark where we are and return.
322 */
323 i = bit - xfs_highbit32(wdiff);
324 *rtx = start - i + 1;
325 return 0;
326 }
327 i = bit - firstbit + 1;
328 /*
329 * Go on to previous block if that's where the previous word is
330 * and we need the previous word.
331 */
332 if (--word == -1 && i < len) {
333 /*
334 * If done with this block, get the previous one.
335 */
336 error = xfs_rtbitmap_read_buf(args, --block);
337 if (error)
338 return error;
339
340 word = mp->m_blockwsize - 1;
341 }
342 } else {
343 /*
344 * Starting on a word boundary, no partial word.
345 */
346 i = 0;
347 }
348 /*
349 * Loop over whole words in buffers. When we use up one buffer
350 * we move on to the previous one.
351 */
352 while (len - i >= XFS_NBWORD) {
353 /*
354 * Compute difference between actual and desired value.
355 */
356 incore = xfs_rtbitmap_getword(args, word);
357 if ((wdiff = incore ^ want)) {
358 /*
359 * Different, mark where we are and return.
360 */
361 i += XFS_NBWORD - 1 - xfs_highbit32(wdiff);
362 *rtx = start - i + 1;
363 return 0;
364 }
365 i += XFS_NBWORD;
366 /*
367 * Go on to previous block if that's where the previous word is
368 * and we need the previous word.
369 */
370 if (--word == -1 && i < len) {
371 /*
372 * If done with this block, get the previous one.
373 */
374 error = xfs_rtbitmap_read_buf(args, --block);
375 if (error)
376 return error;
377
378 word = mp->m_blockwsize - 1;
379 }
380 }
381 /*
382 * If not ending on a word boundary, deal with the last
383 * (partial) word.
384 */
385 if (len - i) {
386 /*
387 * Calculate first (leftmost) bit number to look at,
388 * and mask for all the relevant bits in this word.
389 */
390 firstbit = XFS_NBWORD - (len - i);
391 mask = (((xfs_rtword_t)1 << (len - i)) - 1) << firstbit;
392 /*
393 * Compute difference between actual and desired value.
394 */
395 incore = xfs_rtbitmap_getword(args, word);
396 if ((wdiff = (incore ^ want) & mask)) {
397 /*
398 * Different, mark where we are and return.
399 */
400 i += XFS_NBWORD - 1 - xfs_highbit32(wdiff);
401 *rtx = start - i + 1;
402 return 0;
403 } else
404 i = len;
405 }
406 /*
407 * No match, return that we scanned the whole area.
408 */
409 *rtx = start - i + 1;
410 return 0;
411}
412
413/*
414 * Searching forward from start to limit, find the first block whose
415 * allocated/free state is different from start's.
416 */
417int
418xfs_rtfind_forw(
419 struct xfs_rtalloc_args *args,
420 xfs_rtxnum_t start, /* starting rtext to look at */
421 xfs_rtxnum_t limit, /* last rtext to look at */
422 xfs_rtxnum_t *rtx) /* out: start rtext found */
423{
424 struct xfs_mount *mp = args->mp;
425 int bit; /* bit number in the word */
426 xfs_fileoff_t block; /* bitmap block number */
427 int error;
428 xfs_rtxnum_t i; /* current bit number rel. to start */
429 xfs_rtxnum_t lastbit;/* last useful bit in the word */
430 xfs_rtxnum_t len; /* length of inspected area */
431 xfs_rtword_t mask; /* mask of relevant bits for value */
432 xfs_rtword_t want; /* mask for "good" values */
433 xfs_rtword_t wdiff; /* difference from wanted value */
434 xfs_rtword_t incore;
435 unsigned int word; /* word number in the buffer */
436
437 ASSERT(start <= limit);
438
439 /*
440 * Compute and read in starting bitmap block for starting block.
441 */
442 block = xfs_rtx_to_rbmblock(mp, start);
443 error = xfs_rtbitmap_read_buf(args, block);
444 if (error)
445 return error;
446
447 /*
448 * Get the first word's index & point to it.
449 */
450 word = xfs_rtx_to_rbmword(mp, start);
451 bit = (int)(start & (XFS_NBWORD - 1));
452 len = limit - start + 1;
453 /*
454 * Compute match value, based on the bit at start: if 1 (free)
455 * then all-ones, else all-zeroes.
456 */
457 incore = xfs_rtbitmap_getword(args, word);
458 want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
459 /*
460 * If the starting position is not word-aligned, deal with the
461 * partial word.
462 */
463 if (bit) {
464 /*
465 * Calculate last (rightmost) bit number to look at,
466 * and mask for all the relevant bits in this word.
467 */
468 lastbit = min(bit + len, XFS_NBWORD);
469 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
470 /*
471 * Calculate the difference between the value there
472 * and what we're looking for.
473 */
474 if ((wdiff = (incore ^ want) & mask)) {
475 /*
476 * Different. Mark where we are and return.
477 */
478 i = xfs_lowbit32(wdiff) - bit;
479 *rtx = start + i - 1;
480 return 0;
481 }
482 i = lastbit - bit;
483 /*
484 * Go on to next block if that's where the next word is
485 * and we need the next word.
486 */
487 if (++word == mp->m_blockwsize && i < len) {
488 /*
489 * If done with this block, get the previous one.
490 */
491 error = xfs_rtbitmap_read_buf(args, ++block);
492 if (error)
493 return error;
494
495 word = 0;
496 }
497 } else {
498 /*
499 * Starting on a word boundary, no partial word.
500 */
501 i = 0;
502 }
503 /*
504 * Loop over whole words in buffers. When we use up one buffer
505 * we move on to the next one.
506 */
507 while (len - i >= XFS_NBWORD) {
508 /*
509 * Compute difference between actual and desired value.
510 */
511 incore = xfs_rtbitmap_getword(args, word);
512 if ((wdiff = incore ^ want)) {
513 /*
514 * Different, mark where we are and return.
515 */
516 i += xfs_lowbit32(wdiff);
517 *rtx = start + i - 1;
518 return 0;
519 }
520 i += XFS_NBWORD;
521 /*
522 * Go on to next block if that's where the next word is
523 * and we need the next word.
524 */
525 if (++word == mp->m_blockwsize && i < len) {
526 /*
527 * If done with this block, get the next one.
528 */
529 error = xfs_rtbitmap_read_buf(args, ++block);
530 if (error)
531 return error;
532
533 word = 0;
534 }
535 }
536 /*
537 * If not ending on a word boundary, deal with the last
538 * (partial) word.
539 */
540 if ((lastbit = len - i)) {
541 /*
542 * Calculate mask for all the relevant bits in this word.
543 */
544 mask = ((xfs_rtword_t)1 << lastbit) - 1;
545 /*
546 * Compute difference between actual and desired value.
547 */
548 incore = xfs_rtbitmap_getword(args, word);
549 if ((wdiff = (incore ^ want) & mask)) {
550 /*
551 * Different, mark where we are and return.
552 */
553 i += xfs_lowbit32(wdiff);
554 *rtx = start + i - 1;
555 return 0;
556 } else
557 i = len;
558 }
559 /*
560 * No match, return that we scanned the whole area.
561 */
562 *rtx = start + i - 1;
563 return 0;
564}
565
566/* Log rtsummary counter at @infoword. */
567static inline void
568xfs_trans_log_rtsummary(
569 struct xfs_rtalloc_args *args,
570 unsigned int infoword)
571{
572 struct xfs_buf *bp = args->sumbp;
573 size_t first, last;
574
575 first = (void *)xfs_rsumblock_infoptr(args, infoword) - bp->b_addr;
576 last = first + sizeof(xfs_suminfo_t) - 1;
577
578 xfs_trans_log_buf(args->tp, bp, first, last);
579}
580
581/*
582 * Modify the summary information for a given extent size, bitmap block
583 * combination.
584 */
585int
586xfs_rtmodify_summary(
587 struct xfs_rtalloc_args *args,
588 int log, /* log2 of extent size */
589 xfs_fileoff_t bbno, /* bitmap block number */
590 int delta) /* in/out: summary block number */
591{
592 struct xfs_mount *mp = args->mp;
593 xfs_rtsumoff_t so = xfs_rtsumoffs(mp, log, bbno);
594 uint8_t *rsum_cache = args->rtg->rtg_rsum_cache;
595 unsigned int infoword;
596 xfs_suminfo_t val;
597 int error;
598
599 error = xfs_rtsummary_read_buf(args, xfs_rtsumoffs_to_block(mp, so));
600 if (error)
601 return error;
602
603 infoword = xfs_rtsumoffs_to_infoword(mp, so);
604 val = xfs_suminfo_add(args, infoword, delta);
605
606 if (rsum_cache) {
607 if (val == 0 && log + 1 == rsum_cache[bbno])
608 rsum_cache[bbno] = log;
609 if (val != 0 && log >= rsum_cache[bbno])
610 rsum_cache[bbno] = log + 1;
611 }
612
613 xfs_trans_log_rtsummary(args, infoword);
614 return 0;
615}
616
617/*
618 * Read and return the summary information for a given extent size, bitmap block
619 * combination.
620 */
621int
622xfs_rtget_summary(
623 struct xfs_rtalloc_args *args,
624 int log, /* log2 of extent size */
625 xfs_fileoff_t bbno, /* bitmap block number */
626 xfs_suminfo_t *sum) /* out: summary info for this block */
627{
628 struct xfs_mount *mp = args->mp;
629 xfs_rtsumoff_t so = xfs_rtsumoffs(mp, log, bbno);
630 int error;
631
632 error = xfs_rtsummary_read_buf(args, xfs_rtsumoffs_to_block(mp, so));
633 if (!error)
634 *sum = xfs_suminfo_get(args, xfs_rtsumoffs_to_infoword(mp, so));
635 return error;
636}
637
638/* Log rtbitmap block from the word @from to the byte before @next. */
639static inline void
640xfs_trans_log_rtbitmap(
641 struct xfs_rtalloc_args *args,
642 unsigned int from,
643 unsigned int next)
644{
645 struct xfs_buf *bp = args->rbmbp;
646 size_t first, last;
647
648 first = (void *)xfs_rbmblock_wordptr(args, from) - bp->b_addr;
649 last = ((void *)xfs_rbmblock_wordptr(args, next) - 1) - bp->b_addr;
650
651 xfs_trans_log_buf(args->tp, bp, first, last);
652}
653
654/*
655 * Set the given range of bitmap bits to the given value.
656 * Do whatever I/O and logging is required.
657 */
658int
659xfs_rtmodify_range(
660 struct xfs_rtalloc_args *args,
661 xfs_rtxnum_t start, /* starting rtext to modify */
662 xfs_rtxlen_t len, /* length of extent to modify */
663 int val) /* 1 for free, 0 for allocated */
664{
665 struct xfs_mount *mp = args->mp;
666 int bit; /* bit number in the word */
667 xfs_fileoff_t block; /* bitmap block number */
668 int error;
669 int i; /* current bit number rel. to start */
670 int lastbit; /* last useful bit in word */
671 xfs_rtword_t mask; /* mask of relevant bits for value */
672 xfs_rtword_t incore;
673 unsigned int firstword; /* first word used in the buffer */
674 unsigned int word; /* word number in the buffer */
675
676 /*
677 * Compute starting bitmap block number.
678 */
679 block = xfs_rtx_to_rbmblock(mp, start);
680 /*
681 * Read the bitmap block, and point to its data.
682 */
683 error = xfs_rtbitmap_read_buf(args, block);
684 if (error)
685 return error;
686
687 /*
688 * Compute the starting word's address, and starting bit.
689 */
690 firstword = word = xfs_rtx_to_rbmword(mp, start);
691 bit = (int)(start & (XFS_NBWORD - 1));
692 /*
693 * 0 (allocated) => all zeroes; 1 (free) => all ones.
694 */
695 val = -val;
696 /*
697 * If not starting on a word boundary, deal with the first
698 * (partial) word.
699 */
700 if (bit) {
701 /*
702 * Compute first bit not changed and mask of relevant bits.
703 */
704 lastbit = min(bit + len, XFS_NBWORD);
705 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
706 /*
707 * Set/clear the active bits.
708 */
709 incore = xfs_rtbitmap_getword(args, word);
710 if (val)
711 incore |= mask;
712 else
713 incore &= ~mask;
714 xfs_rtbitmap_setword(args, word, incore);
715 i = lastbit - bit;
716 /*
717 * Go on to the next block if that's where the next word is
718 * and we need the next word.
719 */
720 if (++word == mp->m_blockwsize && i < len) {
721 /*
722 * Log the changed part of this block.
723 * Get the next one.
724 */
725 xfs_trans_log_rtbitmap(args, firstword, word);
726 error = xfs_rtbitmap_read_buf(args, ++block);
727 if (error)
728 return error;
729
730 firstword = word = 0;
731 }
732 } else {
733 /*
734 * Starting on a word boundary, no partial word.
735 */
736 i = 0;
737 }
738 /*
739 * Loop over whole words in buffers. When we use up one buffer
740 * we move on to the next one.
741 */
742 while (len - i >= XFS_NBWORD) {
743 /*
744 * Set the word value correctly.
745 */
746 xfs_rtbitmap_setword(args, word, val);
747 i += XFS_NBWORD;
748 /*
749 * Go on to the next block if that's where the next word is
750 * and we need the next word.
751 */
752 if (++word == mp->m_blockwsize && i < len) {
753 /*
754 * Log the changed part of this block.
755 * Get the next one.
756 */
757 xfs_trans_log_rtbitmap(args, firstword, word);
758 error = xfs_rtbitmap_read_buf(args, ++block);
759 if (error)
760 return error;
761
762 firstword = word = 0;
763 }
764 }
765 /*
766 * If not ending on a word boundary, deal with the last
767 * (partial) word.
768 */
769 if ((lastbit = len - i)) {
770 /*
771 * Compute a mask of relevant bits.
772 */
773 mask = ((xfs_rtword_t)1 << lastbit) - 1;
774 /*
775 * Set/clear the active bits.
776 */
777 incore = xfs_rtbitmap_getword(args, word);
778 if (val)
779 incore |= mask;
780 else
781 incore &= ~mask;
782 xfs_rtbitmap_setword(args, word, incore);
783 word++;
784 }
785 /*
786 * Log any remaining changed bytes.
787 */
788 if (word > firstword)
789 xfs_trans_log_rtbitmap(args, firstword, word);
790 return 0;
791}
792
793/*
794 * Mark an extent specified by start and len freed.
795 * Updates all the summary information as well as the bitmap.
796 */
797int
798xfs_rtfree_range(
799 struct xfs_rtalloc_args *args,
800 xfs_rtxnum_t start, /* starting rtext to free */
801 xfs_rtxlen_t len) /* in/out: summary block number */
802{
803 struct xfs_mount *mp = args->mp;
804 xfs_rtxnum_t end; /* end of the freed extent */
805 int error; /* error value */
806 xfs_rtxnum_t postblock; /* first rtext freed > end */
807 xfs_rtxnum_t preblock; /* first rtext freed < start */
808
809 end = start + len - 1;
810 /*
811 * Modify the bitmap to mark this extent freed.
812 */
813 error = xfs_rtmodify_range(args, start, len, 1);
814 if (error) {
815 return error;
816 }
817 /*
818 * Assume we're freeing out of the middle of an allocated extent.
819 * We need to find the beginning and end of the extent so we can
820 * properly update the summary.
821 */
822 error = xfs_rtfind_back(args, start, &preblock);
823 if (error) {
824 return error;
825 }
826 /*
827 * Find the next allocated block (end of allocated extent).
828 */
829 error = xfs_rtfind_forw(args, end, args->rtg->rtg_extents - 1,
830 &postblock);
831 if (error)
832 return error;
833 /*
834 * If there are blocks not being freed at the front of the
835 * old extent, add summary data for them to be allocated.
836 */
837 if (preblock < start) {
838 error = xfs_rtmodify_summary(args,
839 xfs_highbit64(start - preblock),
840 xfs_rtx_to_rbmblock(mp, preblock), -1);
841 if (error) {
842 return error;
843 }
844 }
845 /*
846 * If there are blocks not being freed at the end of the
847 * old extent, add summary data for them to be allocated.
848 */
849 if (postblock > end) {
850 error = xfs_rtmodify_summary(args,
851 xfs_highbit64(postblock - end),
852 xfs_rtx_to_rbmblock(mp, end + 1), -1);
853 if (error) {
854 return error;
855 }
856 }
857 /*
858 * Increment the summary information corresponding to the entire
859 * (new) free extent.
860 */
861 return xfs_rtmodify_summary(args,
862 xfs_highbit64(postblock + 1 - preblock),
863 xfs_rtx_to_rbmblock(mp, preblock), 1);
864}
865
866/*
867 * Check that the given range is either all allocated (val = 0) or
868 * all free (val = 1).
869 */
870int
871xfs_rtcheck_range(
872 struct xfs_rtalloc_args *args,
873 xfs_rtxnum_t start, /* starting rtext number of extent */
874 xfs_rtxlen_t len, /* length of extent */
875 int val, /* 1 for free, 0 for allocated */
876 xfs_rtxnum_t *new, /* out: first rtext not matching */
877 int *stat) /* out: 1 for matches, 0 for not */
878{
879 struct xfs_mount *mp = args->mp;
880 int bit; /* bit number in the word */
881 xfs_fileoff_t block; /* bitmap block number */
882 int error;
883 xfs_rtxnum_t i; /* current bit number rel. to start */
884 xfs_rtxnum_t lastbit; /* last useful bit in word */
885 xfs_rtword_t mask; /* mask of relevant bits for value */
886 xfs_rtword_t wdiff; /* difference from wanted value */
887 xfs_rtword_t incore;
888 unsigned int word; /* word number in the buffer */
889
890 /*
891 * Compute starting bitmap block number
892 */
893 block = xfs_rtx_to_rbmblock(mp, start);
894 /*
895 * Read the bitmap block.
896 */
897 error = xfs_rtbitmap_read_buf(args, block);
898 if (error)
899 return error;
900
901 /*
902 * Compute the starting word's address, and starting bit.
903 */
904 word = xfs_rtx_to_rbmword(mp, start);
905 bit = (int)(start & (XFS_NBWORD - 1));
906 /*
907 * 0 (allocated) => all zero's; 1 (free) => all one's.
908 */
909 val = -val;
910 /*
911 * If not starting on a word boundary, deal with the first
912 * (partial) word.
913 */
914 if (bit) {
915 /*
916 * Compute first bit not examined.
917 */
918 lastbit = min(bit + len, XFS_NBWORD);
919 /*
920 * Mask of relevant bits.
921 */
922 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
923 /*
924 * Compute difference between actual and desired value.
925 */
926 incore = xfs_rtbitmap_getword(args, word);
927 if ((wdiff = (incore ^ val) & mask)) {
928 /*
929 * Different, compute first wrong bit and return.
930 */
931 i = xfs_lowbit32(wdiff) - bit;
932 *new = start + i;
933 *stat = 0;
934 return 0;
935 }
936 i = lastbit - bit;
937 /*
938 * Go on to next block if that's where the next word is
939 * and we need the next word.
940 */
941 if (++word == mp->m_blockwsize && i < len) {
942 /*
943 * If done with this block, get the next one.
944 */
945 error = xfs_rtbitmap_read_buf(args, ++block);
946 if (error)
947 return error;
948
949 word = 0;
950 }
951 } else {
952 /*
953 * Starting on a word boundary, no partial word.
954 */
955 i = 0;
956 }
957 /*
958 * Loop over whole words in buffers. When we use up one buffer
959 * we move on to the next one.
960 */
961 while (len - i >= XFS_NBWORD) {
962 /*
963 * Compute difference between actual and desired value.
964 */
965 incore = xfs_rtbitmap_getword(args, word);
966 if ((wdiff = incore ^ val)) {
967 /*
968 * Different, compute first wrong bit and return.
969 */
970 i += xfs_lowbit32(wdiff);
971 *new = start + i;
972 *stat = 0;
973 return 0;
974 }
975 i += XFS_NBWORD;
976 /*
977 * Go on to next block if that's where the next word is
978 * and we need the next word.
979 */
980 if (++word == mp->m_blockwsize && i < len) {
981 /*
982 * If done with this block, get the next one.
983 */
984 error = xfs_rtbitmap_read_buf(args, ++block);
985 if (error)
986 return error;
987
988 word = 0;
989 }
990 }
991 /*
992 * If not ending on a word boundary, deal with the last
993 * (partial) word.
994 */
995 if ((lastbit = len - i)) {
996 /*
997 * Mask of relevant bits.
998 */
999 mask = ((xfs_rtword_t)1 << lastbit) - 1;
1000 /*
1001 * Compute difference between actual and desired value.
1002 */
1003 incore = xfs_rtbitmap_getword(args, word);
1004 if ((wdiff = (incore ^ val) & mask)) {
1005 /*
1006 * Different, compute first wrong bit and return.
1007 */
1008 i += xfs_lowbit32(wdiff);
1009 *new = start + i;
1010 *stat = 0;
1011 return 0;
1012 } else
1013 i = len;
1014 }
1015 /*
1016 * Successful, return.
1017 */
1018 *new = start + i;
1019 *stat = 1;
1020 return 0;
1021}
1022
1023#ifdef DEBUG
1024/*
1025 * Check that the given extent (block range) is allocated already.
1026 */
1027STATIC int
1028xfs_rtcheck_alloc_range(
1029 struct xfs_rtalloc_args *args,
1030 xfs_rtxnum_t start, /* starting rtext number of extent */
1031 xfs_rtxlen_t len) /* length of extent */
1032{
1033 xfs_rtxnum_t new; /* dummy for xfs_rtcheck_range */
1034 int stat;
1035 int error;
1036
1037 error = xfs_rtcheck_range(args, start, len, 0, &new, &stat);
1038 if (error)
1039 return error;
1040 ASSERT(stat);
1041 return 0;
1042}
1043#else
1044#define xfs_rtcheck_alloc_range(a,b,l) (0)
1045#endif
1046/*
1047 * Free an extent in the realtime subvolume. Length is expressed in
1048 * realtime extents, as is the block number.
1049 */
1050int
1051xfs_rtfree_extent(
1052 struct xfs_trans *tp, /* transaction pointer */
1053 struct xfs_rtgroup *rtg,
1054 xfs_rtxnum_t start, /* starting rtext number to free */
1055 xfs_rtxlen_t len) /* length of extent freed */
1056{
1057 struct xfs_mount *mp = tp->t_mountp;
1058 struct xfs_inode *rbmip = rtg->rtg_inodes[XFS_RTGI_BITMAP];
1059 struct xfs_rtalloc_args args = {
1060 .mp = mp,
1061 .tp = tp,
1062 .rtg = rtg,
1063 };
1064 int error;
1065 struct timespec64 atime;
1066
1067 ASSERT(rbmip->i_itemp != NULL);
1068 xfs_assert_ilocked(rbmip, XFS_ILOCK_EXCL);
1069
1070 if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_FREE_EXTENT))
1071 return -EIO;
1072
1073 error = xfs_rtcheck_alloc_range(&args, start, len);
1074 if (error)
1075 return error;
1076
1077 /*
1078 * Free the range of realtime blocks.
1079 */
1080 error = xfs_rtfree_range(&args, start, len);
1081 if (error)
1082 goto out;
1083
1084 /*
1085 * Mark more blocks free in the superblock.
1086 */
1087 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, (long)len);
1088
1089 /*
1090 * If we've now freed all the blocks, reset the file sequence
1091 * number to 0 for pre-RTG file systems.
1092 */
1093 if (!xfs_has_rtgroups(mp) &&
1094 tp->t_frextents_delta + mp->m_sb.sb_frextents ==
1095 mp->m_sb.sb_rextents) {
1096 if (!(rbmip->i_diflags & XFS_DIFLAG_NEWRTBM))
1097 rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
1098
1099 atime = inode_get_atime(VFS_I(rbmip));
1100 atime.tv_sec = 0;
1101 inode_set_atime_to_ts(VFS_I(rbmip), atime);
1102 xfs_trans_log_inode(tp, rbmip, XFS_ILOG_CORE);
1103 }
1104 error = 0;
1105out:
1106 xfs_rtbuf_cache_relse(&args);
1107 return error;
1108}
1109
1110/*
1111 * Free some blocks in the realtime subvolume. rtbno and rtlen are in units of
1112 * rt blocks, not rt extents; must be aligned to the rt extent size; and rtlen
1113 * cannot exceed XFS_MAX_BMBT_EXTLEN.
1114 */
1115int
1116xfs_rtfree_blocks(
1117 struct xfs_trans *tp,
1118 struct xfs_rtgroup *rtg,
1119 xfs_fsblock_t rtbno,
1120 xfs_filblks_t rtlen)
1121{
1122 struct xfs_mount *mp = tp->t_mountp;
1123 xfs_extlen_t mod;
1124 int error;
1125
1126 ASSERT(rtlen <= XFS_MAX_BMBT_EXTLEN);
1127
1128 mod = xfs_blen_to_rtxoff(mp, rtlen);
1129 if (mod) {
1130 ASSERT(mod == 0);
1131 return -EIO;
1132 }
1133
1134 mod = xfs_rtb_to_rtxoff(mp, rtbno);
1135 if (mod) {
1136 ASSERT(mod == 0);
1137 return -EIO;
1138 }
1139
1140 error = xfs_rtfree_extent(tp, rtg, xfs_rtb_to_rtx(mp, rtbno),
1141 xfs_extlen_to_rtxlen(mp, rtlen));
1142 if (error)
1143 return error;
1144
1145 if (xfs_has_rtgroups(mp))
1146 xfs_extent_busy_insert(tp, rtg_group(rtg),
1147 xfs_rtb_to_rgbno(mp, rtbno), rtlen, 0);
1148
1149 return 0;
1150}
1151
1152/* Find all the free records within a given range. */
1153int
1154xfs_rtalloc_query_range(
1155 struct xfs_rtgroup *rtg,
1156 struct xfs_trans *tp,
1157 xfs_rtxnum_t start,
1158 xfs_rtxnum_t end,
1159 xfs_rtalloc_query_range_fn fn,
1160 void *priv)
1161{
1162 struct xfs_mount *mp = rtg_mount(rtg);
1163 struct xfs_rtalloc_args args = {
1164 .rtg = rtg,
1165 .mp = mp,
1166 .tp = tp,
1167 };
1168 int error = 0;
1169
1170 if (start > end)
1171 return -EINVAL;
1172 if (start == end || start >= rtg->rtg_extents)
1173 return 0;
1174
1175 end = min(end, rtg->rtg_extents - 1);
1176
1177 /* Iterate the bitmap, looking for discrepancies. */
1178 while (start <= end) {
1179 struct xfs_rtalloc_rec rec;
1180 int is_free;
1181 xfs_rtxnum_t rtend;
1182
1183 /* Is the first block free? */
1184 error = xfs_rtcheck_range(&args, start, 1, 1, &rtend,
1185 &is_free);
1186 if (error)
1187 break;
1188
1189 /* How long does the extent go for? */
1190 error = xfs_rtfind_forw(&args, start, end, &rtend);
1191 if (error)
1192 break;
1193
1194 if (is_free) {
1195 rec.ar_startext = start;
1196 rec.ar_extcount = rtend - start + 1;
1197
1198 error = fn(rtg, tp, &rec, priv);
1199 if (error)
1200 break;
1201 }
1202
1203 start = rtend + 1;
1204 }
1205
1206 xfs_rtbuf_cache_relse(&args);
1207 return error;
1208}
1209
1210/* Find all the free records. */
1211int
1212xfs_rtalloc_query_all(
1213 struct xfs_rtgroup *rtg,
1214 struct xfs_trans *tp,
1215 xfs_rtalloc_query_range_fn fn,
1216 void *priv)
1217{
1218 return xfs_rtalloc_query_range(rtg, tp, 0, rtg->rtg_extents - 1, fn,
1219 priv);
1220}
1221
1222/* Is the given extent all free? */
1223int
1224xfs_rtalloc_extent_is_free(
1225 struct xfs_rtgroup *rtg,
1226 struct xfs_trans *tp,
1227 xfs_rtxnum_t start,
1228 xfs_rtxlen_t len,
1229 bool *is_free)
1230{
1231 struct xfs_rtalloc_args args = {
1232 .mp = rtg_mount(rtg),
1233 .rtg = rtg,
1234 .tp = tp,
1235 };
1236 xfs_rtxnum_t end;
1237 int matches;
1238 int error;
1239
1240 error = xfs_rtcheck_range(&args, start, len, 1, &end, &matches);
1241 xfs_rtbuf_cache_relse(&args);
1242 if (error)
1243 return error;
1244
1245 *is_free = matches;
1246 return 0;
1247}
1248
1249/* Compute the number of rt extents tracked by a single bitmap block. */
1250xfs_rtxnum_t
1251xfs_rtbitmap_rtx_per_rbmblock(
1252 struct xfs_mount *mp)
1253{
1254 unsigned int rbmblock_bytes = mp->m_sb.sb_blocksize;
1255
1256 if (xfs_has_rtgroups(mp))
1257 rbmblock_bytes -= sizeof(struct xfs_rtbuf_blkinfo);
1258
1259 return rbmblock_bytes * NBBY;
1260}
1261
1262/*
1263 * Compute the number of rtbitmap blocks needed to track the given number of rt
1264 * extents.
1265 */
1266xfs_filblks_t
1267xfs_rtbitmap_blockcount_len(
1268 struct xfs_mount *mp,
1269 xfs_rtbxlen_t rtextents)
1270{
1271 return howmany_64(rtextents, xfs_rtbitmap_rtx_per_rbmblock(mp));
1272}
1273
1274/* How many rt extents does each rtbitmap file track? */
1275static inline xfs_rtbxlen_t
1276xfs_rtbitmap_bitcount(
1277 struct xfs_mount *mp)
1278{
1279 if (!mp->m_sb.sb_rextents)
1280 return 0;
1281
1282 /* rtgroup size can be nonzero even if rextents is zero */
1283 if (xfs_has_rtgroups(mp))
1284 return mp->m_sb.sb_rgextents;
1285
1286 return mp->m_sb.sb_rextents;
1287}
1288
1289/*
1290 * Compute the number of rtbitmap blocks used for a given file system.
1291 */
1292xfs_filblks_t
1293xfs_rtbitmap_blockcount(
1294 struct xfs_mount *mp)
1295{
1296 return xfs_rtbitmap_blockcount_len(mp, xfs_rtbitmap_bitcount(mp));
1297}
1298
1299/*
1300 * Compute the geometry of the rtsummary file needed to track the given rt
1301 * space.
1302 */
1303xfs_filblks_t
1304xfs_rtsummary_blockcount(
1305 struct xfs_mount *mp,
1306 unsigned int *rsumlevels)
1307{
1308 xfs_rtbxlen_t rextents = xfs_rtbitmap_bitcount(mp);
1309 unsigned long long rsumwords;
1310
1311 *rsumlevels = xfs_compute_rextslog(rextents) + 1;
1312 rsumwords = xfs_rtbitmap_blockcount_len(mp, rextents) * (*rsumlevels);
1313 return howmany_64(rsumwords, mp->m_blockwsize);
1314}
1315
1316static int
1317xfs_rtfile_alloc_blocks(
1318 struct xfs_inode *ip,
1319 xfs_fileoff_t offset_fsb,
1320 xfs_filblks_t count_fsb,
1321 struct xfs_bmbt_irec *map)
1322{
1323 struct xfs_mount *mp = ip->i_mount;
1324 struct xfs_trans *tp;
1325 int nmap = 1;
1326 int error;
1327
1328 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc,
1329 XFS_GROWFSRT_SPACE_RES(mp, count_fsb), 0, 0, &tp);
1330 if (error)
1331 return error;
1332
1333 xfs_ilock(ip, XFS_ILOCK_EXCL);
1334 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1335
1336 error = xfs_iext_count_extend(tp, ip, XFS_DATA_FORK,
1337 XFS_IEXT_ADD_NOSPLIT_CNT);
1338 if (error)
1339 goto out_trans_cancel;
1340
1341 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
1342 XFS_BMAPI_METADATA, 0, map, &nmap);
1343 if (error)
1344 goto out_trans_cancel;
1345
1346 return xfs_trans_commit(tp);
1347
1348out_trans_cancel:
1349 xfs_trans_cancel(tp);
1350 return error;
1351}
1352
1353/* Get a buffer for the block. */
1354static int
1355xfs_rtfile_initialize_block(
1356 struct xfs_rtgroup *rtg,
1357 enum xfs_rtg_inodes type,
1358 xfs_fsblock_t fsbno,
1359 void *data)
1360{
1361 struct xfs_mount *mp = rtg_mount(rtg);
1362 struct xfs_inode *ip = rtg->rtg_inodes[type];
1363 struct xfs_trans *tp;
1364 struct xfs_buf *bp;
1365 void *bufdata;
1366 const size_t copylen = mp->m_blockwsize << XFS_WORDLOG;
1367 enum xfs_blft buf_type;
1368 int error;
1369
1370 if (type == XFS_RTGI_BITMAP)
1371 buf_type = XFS_BLFT_RTBITMAP_BUF;
1372 else if (type == XFS_RTGI_SUMMARY)
1373 buf_type = XFS_BLFT_RTSUMMARY_BUF;
1374 else
1375 return -EINVAL;
1376
1377 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero, 0, 0, 0, &tp);
1378 if (error)
1379 return error;
1380 xfs_ilock(ip, XFS_ILOCK_EXCL);
1381 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1382
1383 error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1384 XFS_FSB_TO_DADDR(mp, fsbno), mp->m_bsize, 0, &bp);
1385 if (error) {
1386 xfs_trans_cancel(tp);
1387 return error;
1388 }
1389 bufdata = bp->b_addr;
1390
1391 xfs_trans_buf_set_type(tp, bp, buf_type);
1392 bp->b_ops = xfs_rtblock_ops(mp, type);
1393
1394 if (xfs_has_rtgroups(mp)) {
1395 struct xfs_rtbuf_blkinfo *hdr = bp->b_addr;
1396
1397 if (type == XFS_RTGI_BITMAP)
1398 hdr->rt_magic = cpu_to_be32(XFS_RTBITMAP_MAGIC);
1399 else
1400 hdr->rt_magic = cpu_to_be32(XFS_RTSUMMARY_MAGIC);
1401 hdr->rt_owner = cpu_to_be64(ip->i_ino);
1402 hdr->rt_blkno = cpu_to_be64(XFS_FSB_TO_DADDR(mp, fsbno));
1403 hdr->rt_lsn = 0;
1404 uuid_copy(&hdr->rt_uuid, &mp->m_sb.sb_meta_uuid);
1405
1406 bufdata += sizeof(*hdr);
1407 }
1408
1409 if (data)
1410 memcpy(bufdata, data, copylen);
1411 else
1412 memset(bufdata, 0, copylen);
1413 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
1414 return xfs_trans_commit(tp);
1415}
1416
1417/*
1418 * Allocate space to the bitmap or summary file, and zero it, for growfs.
1419 * @data must be a contiguous buffer large enough to fill all blocks in the
1420 * file; or NULL to initialize the contents to zeroes.
1421 */
1422int
1423xfs_rtfile_initialize_blocks(
1424 struct xfs_rtgroup *rtg,
1425 enum xfs_rtg_inodes type,
1426 xfs_fileoff_t offset_fsb, /* offset to start from */
1427 xfs_fileoff_t end_fsb, /* offset to allocate to */
1428 void *data) /* data to fill the blocks */
1429{
1430 struct xfs_mount *mp = rtg_mount(rtg);
1431 const size_t copylen = mp->m_blockwsize << XFS_WORDLOG;
1432
1433 while (offset_fsb < end_fsb) {
1434 struct xfs_bmbt_irec map;
1435 xfs_filblks_t i;
1436 int error;
1437
1438 error = xfs_rtfile_alloc_blocks(rtg->rtg_inodes[type],
1439 offset_fsb, end_fsb - offset_fsb, &map);
1440 if (error)
1441 return error;
1442
1443 /*
1444 * Now we need to clear the allocated blocks.
1445 *
1446 * Do this one block per transaction, to keep it simple.
1447 */
1448 for (i = 0; i < map.br_blockcount; i++) {
1449 error = xfs_rtfile_initialize_block(rtg, type,
1450 map.br_startblock + i, data);
1451 if (error)
1452 return error;
1453 if (data)
1454 data += copylen;
1455 }
1456
1457 offset_fsb = map.br_startoff + map.br_blockcount;
1458 }
1459
1460 return 0;
1461}
1462
1463int
1464xfs_rtbitmap_create(
1465 struct xfs_rtgroup *rtg,
1466 struct xfs_inode *ip,
1467 struct xfs_trans *tp,
1468 bool init)
1469{
1470 struct xfs_mount *mp = rtg_mount(rtg);
1471
1472 ip->i_disk_size = mp->m_sb.sb_rbmblocks * mp->m_sb.sb_blocksize;
1473 if (init && !xfs_has_rtgroups(mp)) {
1474 ip->i_diflags |= XFS_DIFLAG_NEWRTBM;
1475 inode_set_atime(VFS_I(ip), 0, 0);
1476 }
1477 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1478 return 0;
1479}
1480
1481int
1482xfs_rtsummary_create(
1483 struct xfs_rtgroup *rtg,
1484 struct xfs_inode *ip,
1485 struct xfs_trans *tp,
1486 bool init)
1487{
1488 struct xfs_mount *mp = rtg_mount(rtg);
1489
1490 ip->i_disk_size = mp->m_rsumblocks * mp->m_sb.sb_blocksize;
1491 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1492 return 0;
1493}