1
2
3
4
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_mount.h"
13#include "xfs_inode.h"
14#include "xfs_trans.h"
15#include "xfs_btree.h"
16#include "xfs_rmap_btree.h"
17#include "xfs_trace.h"
18#include "xfs_rmap.h"
19#include "xfs_alloc.h"
20#include "xfs_bit.h"
21#include <linux/fsmap.h>
22#include "xfs_fsmap.h"
23#include "xfs_refcount.h"
24#include "xfs_refcount_btree.h"
25#include "xfs_alloc_btree.h"
26#include "xfs_rtalloc.h"
27#include "xfs_ag.h"
28
29
30static void
31xfs_fsmap_from_internal(
32 struct fsmap *dest,
33 struct xfs_fsmap *src)
34{
35 dest->fmr_device = src->fmr_device;
36 dest->fmr_flags = src->fmr_flags;
37 dest->fmr_physical = BBTOB(src->fmr_physical);
38 dest->fmr_owner = src->fmr_owner;
39 dest->fmr_offset = BBTOB(src->fmr_offset);
40 dest->fmr_length = BBTOB(src->fmr_length);
41 dest->fmr_reserved[0] = 0;
42 dest->fmr_reserved[1] = 0;
43 dest->fmr_reserved[2] = 0;
44}
45
46
47void
48xfs_fsmap_to_internal(
49 struct xfs_fsmap *dest,
50 struct fsmap *src)
51{
52 dest->fmr_device = src->fmr_device;
53 dest->fmr_flags = src->fmr_flags;
54 dest->fmr_physical = BTOBBT(src->fmr_physical);
55 dest->fmr_owner = src->fmr_owner;
56 dest->fmr_offset = BTOBBT(src->fmr_offset);
57 dest->fmr_length = BTOBBT(src->fmr_length);
58}
59
60
61static int
62xfs_fsmap_owner_to_rmap(
63 struct xfs_rmap_irec *dest,
64 const struct xfs_fsmap *src)
65{
66 if (!(src->fmr_flags & FMR_OF_SPECIAL_OWNER)) {
67 dest->rm_owner = src->fmr_owner;
68 return 0;
69 }
70
71 switch (src->fmr_owner) {
72 case 0:
73 case -1ULL:
74 dest->rm_owner = 0;
75 break;
76 case XFS_FMR_OWN_FREE:
77 dest->rm_owner = XFS_RMAP_OWN_NULL;
78 break;
79 case XFS_FMR_OWN_UNKNOWN:
80 dest->rm_owner = XFS_RMAP_OWN_UNKNOWN;
81 break;
82 case XFS_FMR_OWN_FS:
83 dest->rm_owner = XFS_RMAP_OWN_FS;
84 break;
85 case XFS_FMR_OWN_LOG:
86 dest->rm_owner = XFS_RMAP_OWN_LOG;
87 break;
88 case XFS_FMR_OWN_AG:
89 dest->rm_owner = XFS_RMAP_OWN_AG;
90 break;
91 case XFS_FMR_OWN_INOBT:
92 dest->rm_owner = XFS_RMAP_OWN_INOBT;
93 break;
94 case XFS_FMR_OWN_INODES:
95 dest->rm_owner = XFS_RMAP_OWN_INODES;
96 break;
97 case XFS_FMR_OWN_REFC:
98 dest->rm_owner = XFS_RMAP_OWN_REFC;
99 break;
100 case XFS_FMR_OWN_COW:
101 dest->rm_owner = XFS_RMAP_OWN_COW;
102 break;
103 case XFS_FMR_OWN_DEFECTIVE:
104
105 default:
106 return -EINVAL;
107 }
108 return 0;
109}
110
111
112static int
113xfs_fsmap_owner_from_rmap(
114 struct xfs_fsmap *dest,
115 const struct xfs_rmap_irec *src)
116{
117 dest->fmr_flags = 0;
118 if (!XFS_RMAP_NON_INODE_OWNER(src->rm_owner)) {
119 dest->fmr_owner = src->rm_owner;
120 return 0;
121 }
122 dest->fmr_flags |= FMR_OF_SPECIAL_OWNER;
123
124 switch (src->rm_owner) {
125 case XFS_RMAP_OWN_FS:
126 dest->fmr_owner = XFS_FMR_OWN_FS;
127 break;
128 case XFS_RMAP_OWN_LOG:
129 dest->fmr_owner = XFS_FMR_OWN_LOG;
130 break;
131 case XFS_RMAP_OWN_AG:
132 dest->fmr_owner = XFS_FMR_OWN_AG;
133 break;
134 case XFS_RMAP_OWN_INOBT:
135 dest->fmr_owner = XFS_FMR_OWN_INOBT;
136 break;
137 case XFS_RMAP_OWN_INODES:
138 dest->fmr_owner = XFS_FMR_OWN_INODES;
139 break;
140 case XFS_RMAP_OWN_REFC:
141 dest->fmr_owner = XFS_FMR_OWN_REFC;
142 break;
143 case XFS_RMAP_OWN_COW:
144 dest->fmr_owner = XFS_FMR_OWN_COW;
145 break;
146 case XFS_RMAP_OWN_NULL:
147 dest->fmr_owner = XFS_FMR_OWN_FREE;
148 break;
149 default:
150 ASSERT(0);
151 return -EFSCORRUPTED;
152 }
153 return 0;
154}
155
156
157struct xfs_getfsmap_info {
158 struct xfs_fsmap_head *head;
159 struct fsmap *fsmap_recs;
160 struct xfs_buf *agf_bp;
161 struct xfs_perag *pag;
162 xfs_daddr_t next_daddr;
163 u64 missing_owner;
164 u32 dev;
165 struct xfs_rmap_irec low;
166 struct xfs_rmap_irec high;
167 bool last;
168};
169
170
171struct xfs_getfsmap_dev {
172 u32 dev;
173 int (*fn)(struct xfs_trans *tp,
174 const struct xfs_fsmap *keys,
175 struct xfs_getfsmap_info *info);
176};
177
178
179static int
180xfs_getfsmap_dev_compare(
181 const void *p1,
182 const void *p2)
183{
184 const struct xfs_getfsmap_dev *d1 = p1;
185 const struct xfs_getfsmap_dev *d2 = p2;
186
187 return d1->dev - d2->dev;
188}
189
190
191STATIC int
192xfs_getfsmap_is_shared(
193 struct xfs_trans *tp,
194 struct xfs_getfsmap_info *info,
195 const struct xfs_rmap_irec *rec,
196 bool *stat)
197{
198 struct xfs_mount *mp = tp->t_mountp;
199 struct xfs_btree_cur *cur;
200 xfs_agblock_t fbno;
201 xfs_extlen_t flen;
202 int error;
203
204 *stat = false;
205 if (!xfs_has_reflink(mp))
206 return 0;
207
208 if (!info->pag)
209 return 0;
210
211
212 flen = 0;
213 cur = xfs_refcountbt_init_cursor(mp, tp, info->agf_bp, info->pag);
214
215 error = xfs_refcount_find_shared(cur, rec->rm_startblock,
216 rec->rm_blockcount, &fbno, &flen, false);
217
218 xfs_btree_del_cursor(cur, error);
219 if (error)
220 return error;
221
222 *stat = flen > 0;
223 return 0;
224}
225
226static inline void
227xfs_getfsmap_format(
228 struct xfs_mount *mp,
229 struct xfs_fsmap *xfm,
230 struct xfs_getfsmap_info *info)
231{
232 struct fsmap *rec;
233
234 trace_xfs_getfsmap_mapping(mp, xfm);
235
236 rec = &info->fsmap_recs[info->head->fmh_entries++];
237 xfs_fsmap_from_internal(rec, xfm);
238}
239
240
241
242
243
244STATIC int
245xfs_getfsmap_helper(
246 struct xfs_trans *tp,
247 struct xfs_getfsmap_info *info,
248 const struct xfs_rmap_irec *rec,
249 xfs_daddr_t rec_daddr)
250{
251 struct xfs_fsmap fmr;
252 struct xfs_mount *mp = tp->t_mountp;
253 bool shared;
254 int error;
255
256 if (fatal_signal_pending(current))
257 return -EINTR;
258
259
260
261
262
263 if (xfs_rmap_compare(rec, &info->low) < 0) {
264 rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount);
265 if (info->next_daddr < rec_daddr)
266 info->next_daddr = rec_daddr;
267 return 0;
268 }
269
270
271 if (info->head->fmh_count == 0) {
272 if (info->head->fmh_entries == UINT_MAX)
273 return -ECANCELED;
274
275 if (rec_daddr > info->next_daddr)
276 info->head->fmh_entries++;
277
278 if (info->last)
279 return 0;
280
281 info->head->fmh_entries++;
282
283 rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount);
284 if (info->next_daddr < rec_daddr)
285 info->next_daddr = rec_daddr;
286 return 0;
287 }
288
289
290
291
292
293
294 if (rec_daddr > info->next_daddr) {
295 if (info->head->fmh_entries >= info->head->fmh_count)
296 return -ECANCELED;
297
298 fmr.fmr_device = info->dev;
299 fmr.fmr_physical = info->next_daddr;
300 fmr.fmr_owner = info->missing_owner;
301 fmr.fmr_offset = 0;
302 fmr.fmr_length = rec_daddr - info->next_daddr;
303 fmr.fmr_flags = FMR_OF_SPECIAL_OWNER;
304 xfs_getfsmap_format(mp, &fmr, info);
305 }
306
307 if (info->last)
308 goto out;
309
310
311 if (info->head->fmh_entries >= info->head->fmh_count)
312 return -ECANCELED;
313
314 trace_xfs_fsmap_mapping(mp, info->dev,
315 info->pag ? info->pag->pag_agno : NULLAGNUMBER, rec);
316
317 fmr.fmr_device = info->dev;
318 fmr.fmr_physical = rec_daddr;
319 error = xfs_fsmap_owner_from_rmap(&fmr, rec);
320 if (error)
321 return error;
322 fmr.fmr_offset = XFS_FSB_TO_BB(mp, rec->rm_offset);
323 fmr.fmr_length = XFS_FSB_TO_BB(mp, rec->rm_blockcount);
324 if (rec->rm_flags & XFS_RMAP_UNWRITTEN)
325 fmr.fmr_flags |= FMR_OF_PREALLOC;
326 if (rec->rm_flags & XFS_RMAP_ATTR_FORK)
327 fmr.fmr_flags |= FMR_OF_ATTR_FORK;
328 if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK)
329 fmr.fmr_flags |= FMR_OF_EXTENT_MAP;
330 if (fmr.fmr_flags == 0) {
331 error = xfs_getfsmap_is_shared(tp, info, rec, &shared);
332 if (error)
333 return error;
334 if (shared)
335 fmr.fmr_flags |= FMR_OF_SHARED;
336 }
337
338 xfs_getfsmap_format(mp, &fmr, info);
339out:
340 rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount);
341 if (info->next_daddr < rec_daddr)
342 info->next_daddr = rec_daddr;
343 return 0;
344}
345
346
347STATIC int
348xfs_getfsmap_datadev_helper(
349 struct xfs_btree_cur *cur,
350 const struct xfs_rmap_irec *rec,
351 void *priv)
352{
353 struct xfs_mount *mp = cur->bc_mp;
354 struct xfs_getfsmap_info *info = priv;
355 xfs_fsblock_t fsb;
356 xfs_daddr_t rec_daddr;
357
358 fsb = XFS_AGB_TO_FSB(mp, cur->bc_ag.pag->pag_agno, rec->rm_startblock);
359 rec_daddr = XFS_FSB_TO_DADDR(mp, fsb);
360
361 return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr);
362}
363
364
365STATIC int
366xfs_getfsmap_datadev_bnobt_helper(
367 struct xfs_btree_cur *cur,
368 const struct xfs_alloc_rec_incore *rec,
369 void *priv)
370{
371 struct xfs_mount *mp = cur->bc_mp;
372 struct xfs_getfsmap_info *info = priv;
373 struct xfs_rmap_irec irec;
374 xfs_daddr_t rec_daddr;
375
376 rec_daddr = XFS_AGB_TO_DADDR(mp, cur->bc_ag.pag->pag_agno,
377 rec->ar_startblock);
378
379 irec.rm_startblock = rec->ar_startblock;
380 irec.rm_blockcount = rec->ar_blockcount;
381 irec.rm_owner = XFS_RMAP_OWN_NULL;
382 irec.rm_offset = 0;
383 irec.rm_flags = 0;
384
385 return xfs_getfsmap_helper(cur->bc_tp, info, &irec, rec_daddr);
386}
387
388
389static void
390xfs_getfsmap_set_irec_flags(
391 struct xfs_rmap_irec *irec,
392 const struct xfs_fsmap *fmr)
393{
394 irec->rm_flags = 0;
395 if (fmr->fmr_flags & FMR_OF_ATTR_FORK)
396 irec->rm_flags |= XFS_RMAP_ATTR_FORK;
397 if (fmr->fmr_flags & FMR_OF_EXTENT_MAP)
398 irec->rm_flags |= XFS_RMAP_BMBT_BLOCK;
399 if (fmr->fmr_flags & FMR_OF_PREALLOC)
400 irec->rm_flags |= XFS_RMAP_UNWRITTEN;
401}
402
403
404STATIC int
405xfs_getfsmap_logdev(
406 struct xfs_trans *tp,
407 const struct xfs_fsmap *keys,
408 struct xfs_getfsmap_info *info)
409{
410 struct xfs_mount *mp = tp->t_mountp;
411 struct xfs_rmap_irec rmap;
412 int error;
413
414
415 info->low.rm_startblock = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical);
416 info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset);
417 error = xfs_fsmap_owner_to_rmap(&info->low, keys);
418 if (error)
419 return error;
420 info->low.rm_blockcount = 0;
421 xfs_getfsmap_set_irec_flags(&info->low, &keys[0]);
422
423 error = xfs_fsmap_owner_to_rmap(&info->high, keys + 1);
424 if (error)
425 return error;
426 info->high.rm_startblock = -1U;
427 info->high.rm_owner = ULLONG_MAX;
428 info->high.rm_offset = ULLONG_MAX;
429 info->high.rm_blockcount = 0;
430 info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS;
431 info->missing_owner = XFS_FMR_OWN_FREE;
432
433 trace_xfs_fsmap_low_key(mp, info->dev, NULLAGNUMBER, &info->low);
434 trace_xfs_fsmap_high_key(mp, info->dev, NULLAGNUMBER, &info->high);
435
436 if (keys[0].fmr_physical > 0)
437 return 0;
438
439
440 rmap.rm_startblock = 0;
441 rmap.rm_blockcount = mp->m_sb.sb_logblocks;
442 rmap.rm_owner = XFS_RMAP_OWN_LOG;
443 rmap.rm_offset = 0;
444 rmap.rm_flags = 0;
445
446 return xfs_getfsmap_helper(tp, info, &rmap, 0);
447}
448
449#ifdef CONFIG_XFS_RT
450
451STATIC int
452xfs_getfsmap_rtdev_rtbitmap_helper(
453 struct xfs_mount *mp,
454 struct xfs_trans *tp,
455 const struct xfs_rtalloc_rec *rec,
456 void *priv)
457{
458 struct xfs_getfsmap_info *info = priv;
459 struct xfs_rmap_irec irec;
460 xfs_daddr_t rec_daddr;
461
462 irec.rm_startblock = rec->ar_startext * mp->m_sb.sb_rextsize;
463 rec_daddr = XFS_FSB_TO_BB(mp, irec.rm_startblock);
464 irec.rm_blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize;
465 irec.rm_owner = XFS_RMAP_OWN_NULL;
466 irec.rm_offset = 0;
467 irec.rm_flags = 0;
468
469 return xfs_getfsmap_helper(tp, info, &irec, rec_daddr);
470}
471
472
473STATIC int
474__xfs_getfsmap_rtdev(
475 struct xfs_trans *tp,
476 const struct xfs_fsmap *keys,
477 int (*query_fn)(struct xfs_trans *,
478 struct xfs_getfsmap_info *),
479 struct xfs_getfsmap_info *info)
480{
481 struct xfs_mount *mp = tp->t_mountp;
482 xfs_fsblock_t start_fsb;
483 xfs_fsblock_t end_fsb;
484 uint64_t eofs;
485 int error = 0;
486
487 eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
488 if (keys[0].fmr_physical >= eofs)
489 return 0;
490 start_fsb = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical);
491 end_fsb = XFS_BB_TO_FSB(mp, min(eofs - 1, keys[1].fmr_physical));
492
493
494 info->low.rm_startblock = start_fsb;
495 error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]);
496 if (error)
497 return error;
498 info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset);
499 info->low.rm_blockcount = 0;
500 xfs_getfsmap_set_irec_flags(&info->low, &keys[0]);
501
502 info->high.rm_startblock = end_fsb;
503 error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]);
504 if (error)
505 return error;
506 info->high.rm_offset = XFS_BB_TO_FSBT(mp, keys[1].fmr_offset);
507 info->high.rm_blockcount = 0;
508 xfs_getfsmap_set_irec_flags(&info->high, &keys[1]);
509
510 trace_xfs_fsmap_low_key(mp, info->dev, NULLAGNUMBER, &info->low);
511 trace_xfs_fsmap_high_key(mp, info->dev, NULLAGNUMBER, &info->high);
512
513 return query_fn(tp, info);
514}
515
516
517STATIC int
518xfs_getfsmap_rtdev_rtbitmap_query(
519 struct xfs_trans *tp,
520 struct xfs_getfsmap_info *info)
521{
522 struct xfs_rtalloc_rec alow = { 0 };
523 struct xfs_rtalloc_rec ahigh = { 0 };
524 struct xfs_mount *mp = tp->t_mountp;
525 int error;
526
527 xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED);
528
529
530
531
532
533 alow.ar_startext = info->low.rm_startblock;
534 ahigh.ar_startext = info->high.rm_startblock;
535 do_div(alow.ar_startext, mp->m_sb.sb_rextsize);
536 if (do_div(ahigh.ar_startext, mp->m_sb.sb_rextsize))
537 ahigh.ar_startext++;
538 error = xfs_rtalloc_query_range(mp, tp, &alow, &ahigh,
539 xfs_getfsmap_rtdev_rtbitmap_helper, info);
540 if (error)
541 goto err;
542
543
544
545
546
547 info->last = true;
548 ahigh.ar_startext = min(mp->m_sb.sb_rextents, ahigh.ar_startext);
549
550 error = xfs_getfsmap_rtdev_rtbitmap_helper(mp, tp, &ahigh, info);
551 if (error)
552 goto err;
553err:
554 xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED);
555 return error;
556}
557
558
559STATIC int
560xfs_getfsmap_rtdev_rtbitmap(
561 struct xfs_trans *tp,
562 const struct xfs_fsmap *keys,
563 struct xfs_getfsmap_info *info)
564{
565 info->missing_owner = XFS_FMR_OWN_UNKNOWN;
566 return __xfs_getfsmap_rtdev(tp, keys, xfs_getfsmap_rtdev_rtbitmap_query,
567 info);
568}
569#endif
570
571
572STATIC int
573__xfs_getfsmap_datadev(
574 struct xfs_trans *tp,
575 const struct xfs_fsmap *keys,
576 struct xfs_getfsmap_info *info,
577 int (*query_fn)(struct xfs_trans *,
578 struct xfs_getfsmap_info *,
579 struct xfs_btree_cur **,
580 void *),
581 void *priv)
582{
583 struct xfs_mount *mp = tp->t_mountp;
584 struct xfs_perag *pag;
585 struct xfs_btree_cur *bt_cur = NULL;
586 xfs_fsblock_t start_fsb;
587 xfs_fsblock_t end_fsb;
588 xfs_agnumber_t start_ag;
589 xfs_agnumber_t end_ag;
590 uint64_t eofs;
591 int error = 0;
592
593 eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
594 if (keys[0].fmr_physical >= eofs)
595 return 0;
596 start_fsb = XFS_DADDR_TO_FSB(mp, keys[0].fmr_physical);
597 end_fsb = XFS_DADDR_TO_FSB(mp, min(eofs - 1, keys[1].fmr_physical));
598
599
600
601
602
603
604 info->low.rm_startblock = XFS_FSB_TO_AGBNO(mp, start_fsb);
605 info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset);
606 error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]);
607 if (error)
608 return error;
609 info->low.rm_blockcount = 0;
610 xfs_getfsmap_set_irec_flags(&info->low, &keys[0]);
611
612 info->high.rm_startblock = -1U;
613 info->high.rm_owner = ULLONG_MAX;
614 info->high.rm_offset = ULLONG_MAX;
615 info->high.rm_blockcount = 0;
616 info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS;
617
618 start_ag = XFS_FSB_TO_AGNO(mp, start_fsb);
619 end_ag = XFS_FSB_TO_AGNO(mp, end_fsb);
620
621 for_each_perag_range(mp, start_ag, end_ag, pag) {
622
623
624
625
626 info->pag = pag;
627 if (pag->pag_agno == end_ag) {
628 info->high.rm_startblock = XFS_FSB_TO_AGBNO(mp,
629 end_fsb);
630 info->high.rm_offset = XFS_BB_TO_FSBT(mp,
631 keys[1].fmr_offset);
632 error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]);
633 if (error)
634 break;
635 xfs_getfsmap_set_irec_flags(&info->high, &keys[1]);
636 }
637
638 if (bt_cur) {
639 xfs_btree_del_cursor(bt_cur, XFS_BTREE_NOERROR);
640 bt_cur = NULL;
641 xfs_trans_brelse(tp, info->agf_bp);
642 info->agf_bp = NULL;
643 }
644
645 error = xfs_alloc_read_agf(mp, tp, pag->pag_agno, 0,
646 &info->agf_bp);
647 if (error)
648 break;
649
650 trace_xfs_fsmap_low_key(mp, info->dev, pag->pag_agno,
651 &info->low);
652 trace_xfs_fsmap_high_key(mp, info->dev, pag->pag_agno,
653 &info->high);
654
655 error = query_fn(tp, info, &bt_cur, priv);
656 if (error)
657 break;
658
659
660
661
662
663 if (pag->pag_agno == start_ag) {
664 info->low.rm_startblock = 0;
665 info->low.rm_owner = 0;
666 info->low.rm_offset = 0;
667 info->low.rm_flags = 0;
668 }
669
670
671
672
673
674
675 if (pag->pag_agno == end_ag) {
676 info->last = true;
677 error = query_fn(tp, info, &bt_cur, priv);
678 if (error)
679 break;
680 }
681 info->pag = NULL;
682 }
683
684 if (bt_cur)
685 xfs_btree_del_cursor(bt_cur, error < 0 ? XFS_BTREE_ERROR :
686 XFS_BTREE_NOERROR);
687 if (info->agf_bp) {
688 xfs_trans_brelse(tp, info->agf_bp);
689 info->agf_bp = NULL;
690 }
691 if (info->pag) {
692 xfs_perag_put(info->pag);
693 info->pag = NULL;
694 } else if (pag) {
695
696 xfs_perag_put(pag);
697 }
698
699 return error;
700}
701
702
703STATIC int
704xfs_getfsmap_datadev_rmapbt_query(
705 struct xfs_trans *tp,
706 struct xfs_getfsmap_info *info,
707 struct xfs_btree_cur **curpp,
708 void *priv)
709{
710
711 if (info->last)
712 return xfs_getfsmap_datadev_helper(*curpp, &info->high, info);
713
714
715 *curpp = xfs_rmapbt_init_cursor(tp->t_mountp, tp, info->agf_bp,
716 info->pag);
717 return xfs_rmap_query_range(*curpp, &info->low, &info->high,
718 xfs_getfsmap_datadev_helper, info);
719}
720
721
722STATIC int
723xfs_getfsmap_datadev_rmapbt(
724 struct xfs_trans *tp,
725 const struct xfs_fsmap *keys,
726 struct xfs_getfsmap_info *info)
727{
728 info->missing_owner = XFS_FMR_OWN_FREE;
729 return __xfs_getfsmap_datadev(tp, keys, info,
730 xfs_getfsmap_datadev_rmapbt_query, NULL);
731}
732
733
734STATIC int
735xfs_getfsmap_datadev_bnobt_query(
736 struct xfs_trans *tp,
737 struct xfs_getfsmap_info *info,
738 struct xfs_btree_cur **curpp,
739 void *priv)
740{
741 struct xfs_alloc_rec_incore *key = priv;
742
743
744 if (info->last)
745 return xfs_getfsmap_datadev_bnobt_helper(*curpp, &key[1], info);
746
747
748 *curpp = xfs_allocbt_init_cursor(tp->t_mountp, tp, info->agf_bp,
749 info->pag, XFS_BTNUM_BNO);
750 key->ar_startblock = info->low.rm_startblock;
751 key[1].ar_startblock = info->high.rm_startblock;
752 return xfs_alloc_query_range(*curpp, key, &key[1],
753 xfs_getfsmap_datadev_bnobt_helper, info);
754}
755
756
757STATIC int
758xfs_getfsmap_datadev_bnobt(
759 struct xfs_trans *tp,
760 const struct xfs_fsmap *keys,
761 struct xfs_getfsmap_info *info)
762{
763 struct xfs_alloc_rec_incore akeys[2];
764
765 info->missing_owner = XFS_FMR_OWN_UNKNOWN;
766 return __xfs_getfsmap_datadev(tp, keys, info,
767 xfs_getfsmap_datadev_bnobt_query, &akeys[0]);
768}
769
770
771STATIC bool
772xfs_getfsmap_is_valid_device(
773 struct xfs_mount *mp,
774 struct xfs_fsmap *fm)
775{
776 if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX ||
777 fm->fmr_device == new_encode_dev(mp->m_ddev_targp->bt_dev))
778 return true;
779 if (mp->m_logdev_targp &&
780 fm->fmr_device == new_encode_dev(mp->m_logdev_targp->bt_dev))
781 return true;
782 if (mp->m_rtdev_targp &&
783 fm->fmr_device == new_encode_dev(mp->m_rtdev_targp->bt_dev))
784 return true;
785 return false;
786}
787
788
789STATIC bool
790xfs_getfsmap_check_keys(
791 struct xfs_fsmap *low_key,
792 struct xfs_fsmap *high_key)
793{
794 if (low_key->fmr_device > high_key->fmr_device)
795 return false;
796 if (low_key->fmr_device < high_key->fmr_device)
797 return true;
798
799 if (low_key->fmr_physical > high_key->fmr_physical)
800 return false;
801 if (low_key->fmr_physical < high_key->fmr_physical)
802 return true;
803
804 if (low_key->fmr_owner > high_key->fmr_owner)
805 return false;
806 if (low_key->fmr_owner < high_key->fmr_owner)
807 return true;
808
809 if (low_key->fmr_offset > high_key->fmr_offset)
810 return false;
811 if (low_key->fmr_offset < high_key->fmr_offset)
812 return true;
813
814 return false;
815}
816
817
818
819
820#ifdef CONFIG_XFS_RT
821#define XFS_GETFSMAP_DEVS 3
822#else
823#define XFS_GETFSMAP_DEVS 2
824#endif
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847int
848xfs_getfsmap(
849 struct xfs_mount *mp,
850 struct xfs_fsmap_head *head,
851 struct fsmap *fsmap_recs)
852{
853 struct xfs_trans *tp = NULL;
854 struct xfs_fsmap dkeys[2];
855 struct xfs_getfsmap_dev handlers[XFS_GETFSMAP_DEVS];
856 struct xfs_getfsmap_info info = { NULL };
857 bool use_rmap;
858 int i;
859 int error = 0;
860
861 if (head->fmh_iflags & ~FMH_IF_VALID)
862 return -EINVAL;
863 if (!xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[0]) ||
864 !xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[1]))
865 return -EINVAL;
866
867 use_rmap = xfs_has_rmapbt(mp) &&
868 has_capability_noaudit(current, CAP_SYS_ADMIN);
869 head->fmh_entries = 0;
870
871
872 memset(handlers, 0, sizeof(handlers));
873 handlers[0].dev = new_encode_dev(mp->m_ddev_targp->bt_dev);
874 if (use_rmap)
875 handlers[0].fn = xfs_getfsmap_datadev_rmapbt;
876 else
877 handlers[0].fn = xfs_getfsmap_datadev_bnobt;
878 if (mp->m_logdev_targp != mp->m_ddev_targp) {
879 handlers[1].dev = new_encode_dev(mp->m_logdev_targp->bt_dev);
880 handlers[1].fn = xfs_getfsmap_logdev;
881 }
882#ifdef CONFIG_XFS_RT
883 if (mp->m_rtdev_targp) {
884 handlers[2].dev = new_encode_dev(mp->m_rtdev_targp->bt_dev);
885 handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap;
886 }
887#endif
888
889 xfs_sort(handlers, XFS_GETFSMAP_DEVS, sizeof(struct xfs_getfsmap_dev),
890 xfs_getfsmap_dev_compare);
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910 dkeys[0] = head->fmh_keys[0];
911 if (dkeys[0].fmr_flags & (FMR_OF_SPECIAL_OWNER | FMR_OF_EXTENT_MAP)) {
912 dkeys[0].fmr_physical += dkeys[0].fmr_length;
913 dkeys[0].fmr_owner = 0;
914 if (dkeys[0].fmr_offset)
915 return -EINVAL;
916 } else
917 dkeys[0].fmr_offset += dkeys[0].fmr_length;
918 dkeys[0].fmr_length = 0;
919 memset(&dkeys[1], 0xFF, sizeof(struct xfs_fsmap));
920
921 if (!xfs_getfsmap_check_keys(dkeys, &head->fmh_keys[1]))
922 return -EINVAL;
923
924 info.next_daddr = head->fmh_keys[0].fmr_physical +
925 head->fmh_keys[0].fmr_length;
926 info.fsmap_recs = fsmap_recs;
927 info.head = head;
928
929
930 for (i = 0; i < XFS_GETFSMAP_DEVS; i++) {
931
932 if (!handlers[i].fn)
933 continue;
934 if (head->fmh_keys[0].fmr_device > handlers[i].dev)
935 continue;
936 if (head->fmh_keys[1].fmr_device < handlers[i].dev)
937 break;
938
939
940
941
942
943
944
945
946 if (handlers[i].dev == head->fmh_keys[1].fmr_device)
947 dkeys[1] = head->fmh_keys[1];
948 if (handlers[i].dev > head->fmh_keys[0].fmr_device)
949 memset(&dkeys[0], 0, sizeof(struct xfs_fsmap));
950
951
952
953
954
955
956 error = xfs_trans_alloc_empty(mp, &tp);
957 if (error)
958 break;
959
960 info.dev = handlers[i].dev;
961 info.last = false;
962 info.pag = NULL;
963 error = handlers[i].fn(tp, dkeys, &info);
964 if (error)
965 break;
966 xfs_trans_cancel(tp);
967 tp = NULL;
968 info.next_daddr = 0;
969 }
970
971 if (tp)
972 xfs_trans_cancel(tp);
973 head->fmh_oflags = FMH_OF_DEV_T;
974 return error;
975}
976