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19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_types.h"
22#include "xfs_bit.h"
23#include "xfs_log.h"
24#include "xfs_trans.h"
25#include "xfs_trans_priv.h"
26#include "xfs_sb.h"
27#include "xfs_ag.h"
28#include "xfs_mount.h"
29#include "xfs_error.h"
30#include "xfs_da_btree.h"
31#include "xfs_bmap_btree.h"
32#include "xfs_dinode.h"
33#include "xfs_inode.h"
34#include "xfs_alloc.h"
35#include "xfs_inode_item.h"
36#include "xfs_bmap.h"
37#include "xfs_bmap_util.h"
38#include "xfs_attr.h"
39#include "xfs_attr_leaf.h"
40#include "xfs_attr_remote.h"
41#include "xfs_trans_space.h"
42#include "xfs_trace.h"
43#include "xfs_cksum.h"
44#include "xfs_buf_item.h"
45
46#define ATTR_RMTVALUE_MAPSIZE 1
47
48
49
50
51
52int
53xfs_attr3_rmt_blocks(
54 struct xfs_mount *mp,
55 int attrlen)
56{
57 if (xfs_sb_version_hascrc(&mp->m_sb)) {
58 int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
59 return (attrlen + buflen - 1) / buflen;
60 }
61 return XFS_B_TO_FSB(mp, attrlen);
62}
63
64
65
66
67
68
69static bool
70xfs_attr3_rmt_hdr_ok(
71 struct xfs_mount *mp,
72 void *ptr,
73 xfs_ino_t ino,
74 uint32_t offset,
75 uint32_t size,
76 xfs_daddr_t bno)
77{
78 struct xfs_attr3_rmt_hdr *rmt = ptr;
79
80 if (bno != be64_to_cpu(rmt->rm_blkno))
81 return false;
82 if (offset != be32_to_cpu(rmt->rm_offset))
83 return false;
84 if (size != be32_to_cpu(rmt->rm_bytes))
85 return false;
86 if (ino != be64_to_cpu(rmt->rm_owner))
87 return false;
88
89
90 return true;
91}
92
93static bool
94xfs_attr3_rmt_verify(
95 struct xfs_mount *mp,
96 void *ptr,
97 int fsbsize,
98 xfs_daddr_t bno)
99{
100 struct xfs_attr3_rmt_hdr *rmt = ptr;
101
102 if (!xfs_sb_version_hascrc(&mp->m_sb))
103 return false;
104 if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC))
105 return false;
106 if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid))
107 return false;
108 if (be64_to_cpu(rmt->rm_blkno) != bno)
109 return false;
110 if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt))
111 return false;
112 if (be32_to_cpu(rmt->rm_offset) +
113 be32_to_cpu(rmt->rm_bytes) >= XATTR_SIZE_MAX)
114 return false;
115 if (rmt->rm_owner == 0)
116 return false;
117
118 return true;
119}
120
121static void
122xfs_attr3_rmt_read_verify(
123 struct xfs_buf *bp)
124{
125 struct xfs_mount *mp = bp->b_target->bt_mount;
126 char *ptr;
127 int len;
128 bool corrupt = false;
129 xfs_daddr_t bno;
130
131
132 if (!xfs_sb_version_hascrc(&mp->m_sb))
133 return;
134
135 ptr = bp->b_addr;
136 bno = bp->b_bn;
137 len = BBTOB(bp->b_length);
138 ASSERT(len >= XFS_LBSIZE(mp));
139
140 while (len > 0) {
141 if (!xfs_verify_cksum(ptr, XFS_LBSIZE(mp),
142 XFS_ATTR3_RMT_CRC_OFF)) {
143 corrupt = true;
144 break;
145 }
146 if (!xfs_attr3_rmt_verify(mp, ptr, XFS_LBSIZE(mp), bno)) {
147 corrupt = true;
148 break;
149 }
150 len -= XFS_LBSIZE(mp);
151 ptr += XFS_LBSIZE(mp);
152 bno += mp->m_bsize;
153 }
154
155 if (corrupt) {
156 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
157 xfs_buf_ioerror(bp, EFSCORRUPTED);
158 } else
159 ASSERT(len == 0);
160}
161
162static void
163xfs_attr3_rmt_write_verify(
164 struct xfs_buf *bp)
165{
166 struct xfs_mount *mp = bp->b_target->bt_mount;
167 struct xfs_buf_log_item *bip = bp->b_fspriv;
168 char *ptr;
169 int len;
170 xfs_daddr_t bno;
171
172
173 if (!xfs_sb_version_hascrc(&mp->m_sb))
174 return;
175
176 ptr = bp->b_addr;
177 bno = bp->b_bn;
178 len = BBTOB(bp->b_length);
179 ASSERT(len >= XFS_LBSIZE(mp));
180
181 while (len > 0) {
182 if (!xfs_attr3_rmt_verify(mp, ptr, XFS_LBSIZE(mp), bno)) {
183 XFS_CORRUPTION_ERROR(__func__,
184 XFS_ERRLEVEL_LOW, mp, bp->b_addr);
185 xfs_buf_ioerror(bp, EFSCORRUPTED);
186 return;
187 }
188 if (bip) {
189 struct xfs_attr3_rmt_hdr *rmt;
190
191 rmt = (struct xfs_attr3_rmt_hdr *)ptr;
192 rmt->rm_lsn = cpu_to_be64(bip->bli_item.li_lsn);
193 }
194 xfs_update_cksum(ptr, XFS_LBSIZE(mp), XFS_ATTR3_RMT_CRC_OFF);
195
196 len -= XFS_LBSIZE(mp);
197 ptr += XFS_LBSIZE(mp);
198 bno += mp->m_bsize;
199 }
200 ASSERT(len == 0);
201}
202
203const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = {
204 .verify_read = xfs_attr3_rmt_read_verify,
205 .verify_write = xfs_attr3_rmt_write_verify,
206};
207
208STATIC int
209xfs_attr3_rmt_hdr_set(
210 struct xfs_mount *mp,
211 void *ptr,
212 xfs_ino_t ino,
213 uint32_t offset,
214 uint32_t size,
215 xfs_daddr_t bno)
216{
217 struct xfs_attr3_rmt_hdr *rmt = ptr;
218
219 if (!xfs_sb_version_hascrc(&mp->m_sb))
220 return 0;
221
222 rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC);
223 rmt->rm_offset = cpu_to_be32(offset);
224 rmt->rm_bytes = cpu_to_be32(size);
225 uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid);
226 rmt->rm_owner = cpu_to_be64(ino);
227 rmt->rm_blkno = cpu_to_be64(bno);
228
229 return sizeof(struct xfs_attr3_rmt_hdr);
230}
231
232
233
234
235STATIC int
236xfs_attr_rmtval_copyout(
237 struct xfs_mount *mp,
238 struct xfs_buf *bp,
239 xfs_ino_t ino,
240 int *offset,
241 int *valuelen,
242 __uint8_t **dst)
243{
244 char *src = bp->b_addr;
245 xfs_daddr_t bno = bp->b_bn;
246 int len = BBTOB(bp->b_length);
247
248 ASSERT(len >= XFS_LBSIZE(mp));
249
250 while (len > 0 && *valuelen > 0) {
251 int hdr_size = 0;
252 int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, XFS_LBSIZE(mp));
253
254 byte_cnt = min(*valuelen, byte_cnt);
255
256 if (xfs_sb_version_hascrc(&mp->m_sb)) {
257 if (!xfs_attr3_rmt_hdr_ok(mp, src, ino, *offset,
258 byte_cnt, bno)) {
259 xfs_alert(mp,
260"remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)",
261 bno, *offset, byte_cnt, ino);
262 return EFSCORRUPTED;
263 }
264 hdr_size = sizeof(struct xfs_attr3_rmt_hdr);
265 }
266
267 memcpy(*dst, src + hdr_size, byte_cnt);
268
269
270 len -= XFS_LBSIZE(mp);
271 src += XFS_LBSIZE(mp);
272 bno += mp->m_bsize;
273
274
275 *valuelen -= byte_cnt;
276 *dst += byte_cnt;
277 *offset += byte_cnt;
278 }
279 return 0;
280}
281
282STATIC void
283xfs_attr_rmtval_copyin(
284 struct xfs_mount *mp,
285 struct xfs_buf *bp,
286 xfs_ino_t ino,
287 int *offset,
288 int *valuelen,
289 __uint8_t **src)
290{
291 char *dst = bp->b_addr;
292 xfs_daddr_t bno = bp->b_bn;
293 int len = BBTOB(bp->b_length);
294
295 ASSERT(len >= XFS_LBSIZE(mp));
296
297 while (len > 0 && *valuelen > 0) {
298 int hdr_size;
299 int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, XFS_LBSIZE(mp));
300
301 byte_cnt = min(*valuelen, byte_cnt);
302 hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset,
303 byte_cnt, bno);
304
305 memcpy(dst + hdr_size, *src, byte_cnt);
306
307
308
309
310
311 if (byte_cnt + hdr_size < XFS_LBSIZE(mp)) {
312 ASSERT(*valuelen - byte_cnt == 0);
313 ASSERT(len == XFS_LBSIZE(mp));
314 memset(dst + hdr_size + byte_cnt, 0,
315 XFS_LBSIZE(mp) - hdr_size - byte_cnt);
316 }
317
318
319 len -= XFS_LBSIZE(mp);
320 dst += XFS_LBSIZE(mp);
321 bno += mp->m_bsize;
322
323
324 *valuelen -= byte_cnt;
325 *src += byte_cnt;
326 *offset += byte_cnt;
327 }
328}
329
330
331
332
333
334int
335xfs_attr_rmtval_get(
336 struct xfs_da_args *args)
337{
338 struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE];
339 struct xfs_mount *mp = args->dp->i_mount;
340 struct xfs_buf *bp;
341 xfs_dablk_t lblkno = args->rmtblkno;
342 __uint8_t *dst = args->value;
343 int valuelen = args->valuelen;
344 int nmap;
345 int error;
346 int blkcnt = args->rmtblkcnt;
347 int i;
348 int offset = 0;
349
350 trace_xfs_attr_rmtval_get(args);
351
352 ASSERT(!(args->flags & ATTR_KERNOVAL));
353
354 while (valuelen > 0) {
355 nmap = ATTR_RMTVALUE_MAPSIZE;
356 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
357 blkcnt, map, &nmap,
358 XFS_BMAPI_ATTRFORK);
359 if (error)
360 return error;
361 ASSERT(nmap >= 1);
362
363 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
364 xfs_daddr_t dblkno;
365 int dblkcnt;
366
367 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
368 (map[i].br_startblock != HOLESTARTBLOCK));
369 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
370 dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
371 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
372 dblkno, dblkcnt, 0, &bp,
373 &xfs_attr3_rmt_buf_ops);
374 if (error)
375 return error;
376
377 error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino,
378 &offset, &valuelen,
379 &dst);
380 xfs_buf_relse(bp);
381 if (error)
382 return error;
383
384
385 lblkno += map[i].br_blockcount;
386 blkcnt -= map[i].br_blockcount;
387 }
388 }
389 ASSERT(valuelen == 0);
390 return 0;
391}
392
393
394
395
396
397int
398xfs_attr_rmtval_set(
399 struct xfs_da_args *args)
400{
401 struct xfs_inode *dp = args->dp;
402 struct xfs_mount *mp = dp->i_mount;
403 struct xfs_bmbt_irec map;
404 xfs_dablk_t lblkno;
405 xfs_fileoff_t lfileoff = 0;
406 __uint8_t *src = args->value;
407 int blkcnt;
408 int valuelen;
409 int nmap;
410 int error;
411 int offset = 0;
412
413 trace_xfs_attr_rmtval_set(args);
414
415
416
417
418
419
420
421 blkcnt = xfs_attr3_rmt_blocks(mp, args->valuelen);
422 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
423 XFS_ATTR_FORK);
424 if (error)
425 return error;
426
427 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
428 args->rmtblkcnt = blkcnt;
429
430
431
432
433 while (blkcnt > 0) {
434 int committed;
435
436
437
438
439 xfs_bmap_init(args->flist, args->firstblock);
440 nmap = 1;
441 error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
442 blkcnt,
443 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
444 args->firstblock, args->total, &map, &nmap,
445 args->flist);
446 if (!error) {
447 error = xfs_bmap_finish(&args->trans, args->flist,
448 &committed);
449 }
450 if (error) {
451 ASSERT(committed);
452 args->trans = NULL;
453 xfs_bmap_cancel(args->flist);
454 return(error);
455 }
456
457
458
459
460
461 if (committed)
462 xfs_trans_ijoin(args->trans, dp, 0);
463
464 ASSERT(nmap == 1);
465 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
466 (map.br_startblock != HOLESTARTBLOCK));
467 lblkno += map.br_blockcount;
468 blkcnt -= map.br_blockcount;
469
470
471
472
473 error = xfs_trans_roll(&args->trans, dp);
474 if (error)
475 return (error);
476 }
477
478
479
480
481
482
483
484 lblkno = args->rmtblkno;
485 blkcnt = args->rmtblkcnt;
486 valuelen = args->valuelen;
487 while (valuelen > 0) {
488 struct xfs_buf *bp;
489 xfs_daddr_t dblkno;
490 int dblkcnt;
491
492 ASSERT(blkcnt > 0);
493
494 xfs_bmap_init(args->flist, args->firstblock);
495 nmap = 1;
496 error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
497 blkcnt, &map, &nmap,
498 XFS_BMAPI_ATTRFORK);
499 if (error)
500 return(error);
501 ASSERT(nmap == 1);
502 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
503 (map.br_startblock != HOLESTARTBLOCK));
504
505 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
506 dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
507
508 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0);
509 if (!bp)
510 return ENOMEM;
511 bp->b_ops = &xfs_attr3_rmt_buf_ops;
512
513 xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset,
514 &valuelen, &src);
515
516 error = xfs_bwrite(bp);
517 xfs_buf_relse(bp);
518 if (error)
519 return error;
520
521
522
523 lblkno += map.br_blockcount;
524 blkcnt -= map.br_blockcount;
525 }
526 ASSERT(valuelen == 0);
527 return 0;
528}
529
530
531
532
533
534int
535xfs_attr_rmtval_remove(
536 struct xfs_da_args *args)
537{
538 struct xfs_mount *mp = args->dp->i_mount;
539 xfs_dablk_t lblkno;
540 int blkcnt;
541 int error;
542 int done;
543
544 trace_xfs_attr_rmtval_remove(args);
545
546
547
548
549 lblkno = args->rmtblkno;
550 blkcnt = args->rmtblkcnt;
551 while (blkcnt > 0) {
552 struct xfs_bmbt_irec map;
553 struct xfs_buf *bp;
554 xfs_daddr_t dblkno;
555 int dblkcnt;
556 int nmap;
557
558
559
560
561 nmap = 1;
562 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
563 blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK);
564 if (error)
565 return(error);
566 ASSERT(nmap == 1);
567 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
568 (map.br_startblock != HOLESTARTBLOCK));
569
570 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
571 dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
572
573
574
575
576 bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK);
577 if (bp) {
578 xfs_buf_stale(bp);
579 xfs_buf_relse(bp);
580 bp = NULL;
581 }
582
583 lblkno += map.br_blockcount;
584 blkcnt -= map.br_blockcount;
585 }
586
587
588
589
590 lblkno = args->rmtblkno;
591 blkcnt = args->rmtblkcnt;
592 done = 0;
593 while (!done) {
594 int committed;
595
596 xfs_bmap_init(args->flist, args->firstblock);
597 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
598 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
599 1, args->firstblock, args->flist,
600 &done);
601 if (!error) {
602 error = xfs_bmap_finish(&args->trans, args->flist,
603 &committed);
604 }
605 if (error) {
606 ASSERT(committed);
607 args->trans = NULL;
608 xfs_bmap_cancel(args->flist);
609 return error;
610 }
611
612
613
614
615
616 if (committed)
617 xfs_trans_ijoin(args->trans, args->dp, 0);
618
619
620
621
622 error = xfs_trans_roll(&args->trans, args->dp);
623 if (error)
624 return (error);
625 }
626 return(0);
627}
628