forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathxfs_bmap.c
6532 lines (6262 loc) · 197 KB
/
xfs_bmap.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_dir2_data.h"
#include "xfs_dir2_leaf.h"
#include "xfs_dir2_block.h"
#include "xfs_inode_item.h"
#include "xfs_extfree_item.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_attr_leaf.h"
#include "xfs_rw.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
#ifdef DEBUG
STATIC void
xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
#endif
kmem_zone_t *xfs_bmap_free_item_zone;
/*
* Prototypes for internal bmap routines.
*/
/*
* Called from xfs_bmap_add_attrfork to handle extents format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags); /* inode logging flags */
/*
* Called from xfs_bmap_add_attrfork to handle local format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_local(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags); /* inode logging flags */
/*
* Called by xfs_bmapi to update file extent records and the btree
* after allocating space (or doing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_add_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
xfs_extdelta_t *delta, /* Change made to incore extents */
int whichfork, /* data or attr fork */
int rsvd); /* OK to allocate reserved blocks */
/*
* Called by xfs_bmap_add_extent to handle cases converting a delayed
* allocation to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_delay_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
xfs_extdelta_t *delta, /* Change made to incore extents */
int rsvd); /* OK to allocate reserved blocks */
/*
* Called by xfs_bmap_add_extent to handle cases converting a hole
* to a delayed allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_delay(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
int *logflagsp,/* inode logging flags */
xfs_extdelta_t *delta, /* Change made to incore extents */
int rsvd); /* OK to allocate reserved blocks */
/*
* Called by xfs_bmap_add_extent to handle cases converting a hole
* to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
int *logflagsp, /* inode logging flags */
xfs_extdelta_t *delta, /* Change made to incore extents */
int whichfork); /* data or attr fork */
/*
* Called by xfs_bmap_add_extent to handle cases converting an unwritten
* allocation to a real allocation or vice versa.
*/
STATIC int /* error */
xfs_bmap_add_extent_unwritten_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
int *logflagsp, /* inode logging flags */
xfs_extdelta_t *delta); /* Change made to incore extents */
/*
* xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
* It figures out where to ask the underlying allocator to put the new extent.
*/
STATIC int /* error */
xfs_bmap_alloc(
xfs_bmalloca_t *ap); /* bmap alloc argument struct */
/*
* Transform a btree format file with only one leaf node, where the
* extents list will fit in the inode, into an extents format file.
* Since the file extents are already in-core, all we have to do is
* give up the space for the btree root and pitch the leaf block.
*/
STATIC int /* error */
xfs_bmap_btree_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_btree_cur_t *cur, /* btree cursor */
int *logflagsp, /* inode logging flags */
int whichfork); /* data or attr fork */
#ifdef DEBUG
/*
* Check that the extents list for the inode ip is in the right order.
*/
STATIC void
xfs_bmap_check_extents(
xfs_inode_t *ip, /* incore inode pointer */
int whichfork); /* data or attr fork */
#endif
/*
* Called by xfs_bmapi to update file extent records and the btree
* after removing space (or undoing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_del_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_trans_t *tp, /* current trans pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_bmap_free_t *flist, /* list of extents to be freed */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
int *logflagsp,/* inode logging flags */
xfs_extdelta_t *delta, /* Change made to incore extents */
int whichfork, /* data or attr fork */
int rsvd); /* OK to allocate reserved blocks */
/*
* Remove the entry "free" from the free item list. Prev points to the
* previous entry, unless "free" is the head of the list.
*/
STATIC void
xfs_bmap_del_free(
xfs_bmap_free_t *flist, /* free item list header */
xfs_bmap_free_item_t *prev, /* previous item on list, if any */
xfs_bmap_free_item_t *free); /* list item to be freed */
/*
* Convert an extents-format file into a btree-format file.
* The new file will have a root block (in the inode) and a single child block.
*/
STATIC int /* error */
xfs_bmap_extents_to_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first-block-allocated */
xfs_bmap_free_t *flist, /* blocks freed in xaction */
xfs_btree_cur_t **curp, /* cursor returned to caller */
int wasdel, /* converting a delayed alloc */
int *logflagsp, /* inode logging flags */
int whichfork); /* data or attr fork */
/*
* Convert a local file to an extents file.
* This code is sort of bogus, since the file data needs to get
* logged so it won't be lost. The bmap-level manipulations are ok, though.
*/
STATIC int /* error */
xfs_bmap_local_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated in xaction */
xfs_extlen_t total, /* total blocks needed by transaction */
int *logflagsp, /* inode logging flags */
int whichfork); /* data or attr fork */
/*
* Search the extents list for the inode, for the extent containing bno.
* If bno lies in a hole, point to the next entry. If bno lies past eof,
* *eofp will be set, and *prevp will contain the last entry (null if none).
* Else, *lastxp will be set to the index of the found
* entry; *gotp will contain the entry.
*/
STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
xfs_bmap_search_extents(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t bno, /* block number searched for */
int whichfork, /* data or attr fork */
int *eofp, /* out: end of file found */
xfs_extnum_t *lastxp, /* out: last extent index */
xfs_bmbt_irec_t *gotp, /* out: extent entry found */
xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
/*
* Check the last inode extent to determine whether this allocation will result
* in blocks being allocated at the end of the file. When we allocate new data
* blocks at the end of the file which do not start at the previous data block,
* we will try to align the new blocks at stripe unit boundaries.
*/
STATIC int /* error */
xfs_bmap_isaeof(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t off, /* file offset in fsblocks */
int whichfork, /* data or attribute fork */
char *aeof); /* return value */
#ifdef XFS_BMAP_TRACE
/*
* Add a bmap trace buffer entry. Base routine for the others.
*/
STATIC void
xfs_bmap_trace_addentry(
int opcode, /* operation */
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(ies) */
xfs_extnum_t cnt, /* count of entries, 1 or 2 */
xfs_bmbt_rec_t *r1, /* first record */
xfs_bmbt_rec_t *r2, /* second record or null */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry prior to a call to xfs_iext_remove.
*/
STATIC void
xfs_bmap_trace_delete(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(entries) deleted */
xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry prior to a call to xfs_iext_insert, or
* reading in the extents list from the disk (in the btree).
*/
STATIC void
xfs_bmap_trace_insert(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry(entries) inserted */
xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
xfs_bmbt_irec_t *r1, /* inserted record 1 */
xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry after updating an extent record in place.
*/
STATIC void
xfs_bmap_trace_post_update(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry updated */
int whichfork); /* data or attr fork */
/*
* Add bmap trace entry prior to updating an extent record in place.
*/
STATIC void
xfs_bmap_trace_pre_update(
char *fname, /* function name */
char *desc, /* operation description */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index of entry to be updated */
int whichfork); /* data or attr fork */
#else
#define xfs_bmap_trace_delete(f,d,ip,i,c,w)
#define xfs_bmap_trace_insert(f,d,ip,i,c,r1,r2,w)
#define xfs_bmap_trace_post_update(f,d,ip,i,w)
#define xfs_bmap_trace_pre_update(f,d,ip,i,w)
#endif /* XFS_BMAP_TRACE */
/*
* Compute the worst-case number of indirect blocks that will be used
* for ip's delayed extent of length "len".
*/
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
xfs_inode_t *ip, /* incore inode pointer */
xfs_filblks_t len); /* delayed extent length */
#ifdef DEBUG
/*
* Perform various validation checks on the values being returned
* from xfs_bmapi().
*/
STATIC void
xfs_bmap_validate_ret(
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
xfs_bmbt_irec_t *mval,
int nmap,
int ret_nmap);
#else
#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
#endif /* DEBUG */
#if defined(XFS_RW_TRACE)
STATIC void
xfs_bunmap_trace(
xfs_inode_t *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
inst_t *ra);
#else
#define xfs_bunmap_trace(ip, bno, len, flags, ra)
#endif /* XFS_RW_TRACE */
STATIC int
xfs_bmap_count_tree(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_ifork_t *ifp,
xfs_fsblock_t blockno,
int levelin,
int *count);
STATIC int
xfs_bmap_count_leaves(
xfs_ifork_t *ifp,
xfs_extnum_t idx,
int numrecs,
int *count);
STATIC int
xfs_bmap_disk_count_leaves(
xfs_ifork_t *ifp,
xfs_mount_t *mp,
xfs_extnum_t idx,
xfs_bmbt_block_t *block,
int numrecs,
int *count);
/*
* Bmap internal routines.
*/
/*
* Called from xfs_bmap_add_attrfork to handle btree format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* btree cursor */
int error; /* error return value */
xfs_mount_t *mp; /* file system mount struct */
int stat; /* newroot status */
mp = ip->i_mount;
if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
*flags |= XFS_ILOG_DBROOT;
else {
cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
XFS_DATA_FORK);
cur->bc_private.b.flist = flist;
cur->bc_private.b.firstblock = *firstblock;
if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
goto error0;
ASSERT(stat == 1); /* must be at least one entry */
if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
goto error0;
if (stat == 0) {
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
return XFS_ERROR(ENOSPC);
}
*firstblock = cur->bc_private.b.firstblock;
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
}
return 0;
error0:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle extents format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* bmap btree cursor */
int error; /* error return value */
if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
return 0;
cur = NULL;
error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
flags, XFS_DATA_FORK);
if (cur) {
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle local format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_local(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
xfs_bmap_free_t *flist, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_da_args_t dargs; /* args for dir/attr code */
int error; /* error return value */
xfs_mount_t *mp; /* mount structure pointer */
if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
return 0;
if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
mp = ip->i_mount;
memset(&dargs, 0, sizeof(dargs));
dargs.dp = ip;
dargs.firstblock = firstblock;
dargs.flist = flist;
dargs.total = mp->m_dirblkfsbs;
dargs.whichfork = XFS_DATA_FORK;
dargs.trans = tp;
error = xfs_dir2_sf_to_block(&dargs);
} else
error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
XFS_DATA_FORK);
return error;
}
/*
* Called by xfs_bmapi to update file extent records and the btree
* after allocating space (or doing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_add_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
xfs_extdelta_t *delta, /* Change made to incore extents */
int whichfork, /* data or attr fork */
int rsvd) /* OK to use reserved data blocks */
{
xfs_btree_cur_t *cur; /* btree cursor or null */
xfs_filblks_t da_new; /* new count del alloc blocks used */
xfs_filblks_t da_old; /* old count del alloc blocks used */
int error; /* error return value */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_add_extent";
#endif
xfs_ifork_t *ifp; /* inode fork ptr */
int logflags; /* returned value */
xfs_extnum_t nextents; /* number of extents in file now */
XFS_STATS_INC(xs_add_exlist);
cur = *curp;
ifp = XFS_IFORK_PTR(ip, whichfork);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(idx <= nextents);
da_old = da_new = 0;
error = 0;
/*
* This is the first extent added to a new/empty file.
* Special case this one, so other routines get to assume there are
* already extents in the list.
*/
if (nextents == 0) {
xfs_bmap_trace_insert(fname, "insert empty", ip, 0, 1, new,
NULL, whichfork);
xfs_iext_insert(ifp, 0, 1, new);
ASSERT(cur == NULL);
ifp->if_lastex = 0;
if (!ISNULLSTARTBLOCK(new->br_startblock)) {
XFS_IFORK_NEXT_SET(ip, whichfork, 1);
logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
} else
logflags = 0;
/* DELTA: single new extent */
if (delta) {
if (delta->xed_startoff > new->br_startoff)
delta->xed_startoff = new->br_startoff;
if (delta->xed_blockcount <
new->br_startoff + new->br_blockcount)
delta->xed_blockcount = new->br_startoff +
new->br_blockcount;
}
}
/*
* Any kind of new delayed allocation goes here.
*/
else if (ISNULLSTARTBLOCK(new->br_startblock)) {
if (cur)
ASSERT((cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL) == 0);
if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, cur, new,
&logflags, delta, rsvd)))
goto done;
}
/*
* Real allocation off the end of the file.
*/
else if (idx == nextents) {
if (cur)
ASSERT((cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL) == 0);
if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
&logflags, delta, whichfork)))
goto done;
} else {
xfs_bmbt_irec_t prev; /* old extent at offset idx */
/*
* Get the record referred to by idx.
*/
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &prev);
/*
* If it's a real allocation record, and the new allocation ends
* after the start of the referred to record, then we're filling
* in a delayed or unwritten allocation with a real one, or
* converting real back to unwritten.
*/
if (!ISNULLSTARTBLOCK(new->br_startblock) &&
new->br_startoff + new->br_blockcount > prev.br_startoff) {
if (prev.br_state != XFS_EXT_UNWRITTEN &&
ISNULLSTARTBLOCK(prev.br_startblock)) {
da_old = STARTBLOCKVAL(prev.br_startblock);
if (cur)
ASSERT(cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL);
if ((error = xfs_bmap_add_extent_delay_real(ip,
idx, &cur, new, &da_new, first, flist,
&logflags, delta, rsvd)))
goto done;
} else if (new->br_state == XFS_EXT_NORM) {
ASSERT(new->br_state == XFS_EXT_NORM);
if ((error = xfs_bmap_add_extent_unwritten_real(
ip, idx, &cur, new, &logflags, delta)))
goto done;
} else {
ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
if ((error = xfs_bmap_add_extent_unwritten_real(
ip, idx, &cur, new, &logflags, delta)))
goto done;
}
ASSERT(*curp == cur || *curp == NULL);
}
/*
* Otherwise we're filling in a hole with an allocation.
*/
else {
if (cur)
ASSERT((cur->bc_private.b.flags &
XFS_BTCUR_BPRV_WASDEL) == 0);
if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
new, &logflags, delta, whichfork)))
goto done;
}
}
ASSERT(*curp == cur || *curp == NULL);
/*
* Convert to a btree if necessary.
*/
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
flist, &cur, da_old > 0, &tmp_logflags, whichfork);
logflags |= tmp_logflags;
if (error)
goto done;
}
/*
* Adjust for changes in reserved delayed indirect blocks.
* Nothing to do for disk quotas here.
*/
if (da_old || da_new) {
xfs_filblks_t nblks;
nblks = da_new;
if (cur)
nblks += cur->bc_private.b.allocated;
ASSERT(nblks <= da_old);
if (nblks < da_old)
xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
(int)(da_old - nblks), rsvd);
}
/*
* Clear out the allocated field, done with it now in any case.
*/
if (cur) {
cur->bc_private.b.allocated = 0;
*curp = cur;
}
done:
#ifdef DEBUG
if (!error)
xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
#endif
*logflagsp = logflags;
return error;
}
/*
* Called by xfs_bmap_add_extent to handle cases converting a delayed
* allocation to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_delay_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* extent number to update/insert */
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
xfs_fsblock_t *first, /* pointer to firstblock variable */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp, /* inode logging flags */
xfs_extdelta_t *delta, /* Change made to incore extents */
int rsvd) /* OK to use reserved data block allocation */
{
xfs_btree_cur_t *cur; /* btree cursor */
int diff; /* temp value */
xfs_bmbt_rec_t *ep; /* extent entry for idx */
int error; /* error return value */
#ifdef XFS_BMAP_TRACE
static char fname[] = "xfs_bmap_add_extent_delay_real";
#endif
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = 0;/* state bits, accessed thru macros */
xfs_filblks_t temp=0; /* value for dnew calculations */
xfs_filblks_t temp2=0;/* value for dnew calculations */
int tmp_rval; /* partial logging flags */
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_FILLING, RIGHT_FILLING,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE \
(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
/*
* Set up a bunch of variables to make the tests simpler.
*/
cur = *curp;
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
ep = xfs_iext_get_ext(ifp, idx);
xfs_bmbt_get_all(ep, &PREV);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous delayed allocation
* extent is being replaced by a real allocation.
*/
STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
STATE_SET(RIGHT_FILLING,
PREV.br_startoff + PREV.br_blockcount == new_endoff);
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
}
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
}
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount ==
RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN));
error = 0;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (SWITCH_STATE) {
case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
/*
* Filling in all of a previously delayed allocation extent.
* The left and right neighbors are both contiguous with new.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
LEFT.br_blockcount + PREV.br_blockcount +
RIGHT.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
XFS_DATA_FORK);
xfs_iext_remove(ifp, idx, 2);
ip->i_df.if_lastex = idx - 1;
ip->i_d.di_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_delete(cur, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_decrement(cur, 0, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
PREV.br_blockcount +
RIGHT.br_blockcount, LEFT.br_state)))
goto done;
}
*dnew = 0;
/* DELTA: Three in-core extents are replaced by one. */
temp = LEFT.br_startoff;
temp2 = LEFT.br_blockcount +
PREV.br_blockcount +
RIGHT.br_blockcount;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
/*
* Filling in all of a previously delayed allocation extent.
* The left neighbor is contiguous, the right is not.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
LEFT.br_blockcount + PREV.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx - 1;
xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
XFS_DATA_FORK);
xfs_iext_remove(ifp, idx, 1);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
LEFT.br_startblock, LEFT.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
PREV.br_blockcount, LEFT.br_state)))
goto done;
}
*dnew = 0;
/* DELTA: Two in-core extents are replaced by one. */
temp = LEFT.br_startoff;
temp2 = LEFT.br_blockcount +
PREV.br_blockcount;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
/*
* Filling in all of a previously delayed allocation extent.
* The right neighbor is contiguous, the left is not.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_startblock(ep, new->br_startblock);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount + RIGHT.br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
XFS_DATA_FORK);
xfs_iext_remove(ifp, idx + 1, 1);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
ASSERT(i == 1);
if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
new->br_startblock,
PREV.br_blockcount +
RIGHT.br_blockcount, PREV.br_state)))
goto done;
}
*dnew = 0;
/* DELTA: Two in-core extents are replaced by one. */
temp = PREV.br_startoff;
temp2 = PREV.br_blockcount +
RIGHT.br_blockcount;
break;
case MASK2(LEFT_FILLING, RIGHT_FILLING):
/*
* Filling in all of a previously delayed allocation extent.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_startblock(ep, new->br_startblock);
xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
XFS_DATA_FORK);
ip->i_df.if_lastex = idx;
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
ASSERT(i == 0);
cur->bc_rec.b.br_state = XFS_EXT_NORM;
if ((error = xfs_bmbt_insert(cur, &i)))
goto done;
ASSERT(i == 1);
}
*dnew = 0;
/* DELTA: The in-core extent described by new changed type. */
temp = new->br_startoff;
temp2 = new->br_blockcount;
break;
case MASK2(LEFT_FILLING, LEFT_CONTIG):
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is contiguous.
*/
xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
LEFT.br_blockcount + new->br_blockcount);
xfs_bmbt_set_startoff(ep,
PREV.br_startoff + new->br_blockcount);
xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
XFS_DATA_FORK);
temp = PREV.br_blockcount - new->br_blockcount;
xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
XFS_DATA_FORK);
xfs_bmbt_set_blockcount(ep, temp);
ip->i_df.if_lastex = idx - 1;
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
LEFT.br_startblock, LEFT.br_blockcount,
&i)))
goto done;
ASSERT(i == 1);