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xfs: global error sign conversion
[deliverable/linux.git] / fs / xfs / libxfs / xfs_attr_remote.c
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * Copyright (c) 2013 Red Hat, Inc.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19 #include "xfs.h"
20 #include "xfs_fs.h"
21 #include "xfs_shared.h"
22 #include "xfs_format.h"
23 #include "xfs_log_format.h"
24 #include "xfs_trans_resv.h"
25 #include "xfs_bit.h"
26 #include "xfs_sb.h"
27 #include "xfs_ag.h"
28 #include "xfs_mount.h"
29 #include "xfs_da_format.h"
30 #include "xfs_da_btree.h"
31 #include "xfs_inode.h"
32 #include "xfs_alloc.h"
33 #include "xfs_trans.h"
34 #include "xfs_inode_item.h"
35 #include "xfs_bmap.h"
36 #include "xfs_bmap_util.h"
37 #include "xfs_attr.h"
38 #include "xfs_attr_leaf.h"
39 #include "xfs_attr_remote.h"
40 #include "xfs_trans_space.h"
41 #include "xfs_trace.h"
42 #include "xfs_cksum.h"
43 #include "xfs_buf_item.h"
44 #include "xfs_error.h"
45
46 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
47
48 /*
49 * Each contiguous block has a header, so it is not just a simple attribute
50 * length to FSB conversion.
51 */
52 int
53 xfs_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 * Checking of the remote attribute header is split into two parts. The verifier
66 * does CRC, location and bounds checking, the unpacking function checks the
67 * attribute parameters and owner.
68 */
69 static bool
70 xfs_attr3_rmt_hdr_ok(
71 void *ptr,
72 xfs_ino_t ino,
73 uint32_t offset,
74 uint32_t size,
75 xfs_daddr_t bno)
76 {
77 struct xfs_attr3_rmt_hdr *rmt = ptr;
78
79 if (bno != be64_to_cpu(rmt->rm_blkno))
80 return false;
81 if (offset != be32_to_cpu(rmt->rm_offset))
82 return false;
83 if (size != be32_to_cpu(rmt->rm_bytes))
84 return false;
85 if (ino != be64_to_cpu(rmt->rm_owner))
86 return false;
87
88 /* ok */
89 return true;
90 }
91
92 static bool
93 xfs_attr3_rmt_verify(
94 struct xfs_mount *mp,
95 void *ptr,
96 int fsbsize,
97 xfs_daddr_t bno)
98 {
99 struct xfs_attr3_rmt_hdr *rmt = ptr;
100
101 if (!xfs_sb_version_hascrc(&mp->m_sb))
102 return false;
103 if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC))
104 return false;
105 if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid))
106 return false;
107 if (be64_to_cpu(rmt->rm_blkno) != bno)
108 return false;
109 if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt))
110 return false;
111 if (be32_to_cpu(rmt->rm_offset) +
112 be32_to_cpu(rmt->rm_bytes) > XATTR_SIZE_MAX)
113 return false;
114 if (rmt->rm_owner == 0)
115 return false;
116
117 return true;
118 }
119
120 static void
121 xfs_attr3_rmt_read_verify(
122 struct xfs_buf *bp)
123 {
124 struct xfs_mount *mp = bp->b_target->bt_mount;
125 char *ptr;
126 int len;
127 xfs_daddr_t bno;
128 int blksize = mp->m_attr_geo->blksize;
129
130 /* no verification of non-crc buffers */
131 if (!xfs_sb_version_hascrc(&mp->m_sb))
132 return;
133
134 ptr = bp->b_addr;
135 bno = bp->b_bn;
136 len = BBTOB(bp->b_length);
137 ASSERT(len >= blksize);
138
139 while (len > 0) {
140 if (!xfs_verify_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF)) {
141 xfs_buf_ioerror(bp, -EFSBADCRC);
142 break;
143 }
144 if (!xfs_attr3_rmt_verify(mp, ptr, blksize, bno)) {
145 xfs_buf_ioerror(bp, -EFSCORRUPTED);
146 break;
147 }
148 len -= blksize;
149 ptr += blksize;
150 bno += BTOBB(blksize);
151 }
152
153 if (bp->b_error)
154 xfs_verifier_error(bp);
155 else
156 ASSERT(len == 0);
157 }
158
159 static void
160 xfs_attr3_rmt_write_verify(
161 struct xfs_buf *bp)
162 {
163 struct xfs_mount *mp = bp->b_target->bt_mount;
164 struct xfs_buf_log_item *bip = bp->b_fspriv;
165 char *ptr;
166 int len;
167 xfs_daddr_t bno;
168 int blksize = mp->m_attr_geo->blksize;
169
170 /* no verification of non-crc buffers */
171 if (!xfs_sb_version_hascrc(&mp->m_sb))
172 return;
173
174 ptr = bp->b_addr;
175 bno = bp->b_bn;
176 len = BBTOB(bp->b_length);
177 ASSERT(len >= blksize);
178
179 while (len > 0) {
180 if (!xfs_attr3_rmt_verify(mp, ptr, blksize, bno)) {
181 xfs_buf_ioerror(bp, -EFSCORRUPTED);
182 xfs_verifier_error(bp);
183 return;
184 }
185 if (bip) {
186 struct xfs_attr3_rmt_hdr *rmt;
187
188 rmt = (struct xfs_attr3_rmt_hdr *)ptr;
189 rmt->rm_lsn = cpu_to_be64(bip->bli_item.li_lsn);
190 }
191 xfs_update_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF);
192
193 len -= blksize;
194 ptr += blksize;
195 bno += BTOBB(blksize);
196 }
197 ASSERT(len == 0);
198 }
199
200 const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = {
201 .verify_read = xfs_attr3_rmt_read_verify,
202 .verify_write = xfs_attr3_rmt_write_verify,
203 };
204
205 STATIC int
206 xfs_attr3_rmt_hdr_set(
207 struct xfs_mount *mp,
208 void *ptr,
209 xfs_ino_t ino,
210 uint32_t offset,
211 uint32_t size,
212 xfs_daddr_t bno)
213 {
214 struct xfs_attr3_rmt_hdr *rmt = ptr;
215
216 if (!xfs_sb_version_hascrc(&mp->m_sb))
217 return 0;
218
219 rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC);
220 rmt->rm_offset = cpu_to_be32(offset);
221 rmt->rm_bytes = cpu_to_be32(size);
222 uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid);
223 rmt->rm_owner = cpu_to_be64(ino);
224 rmt->rm_blkno = cpu_to_be64(bno);
225
226 return sizeof(struct xfs_attr3_rmt_hdr);
227 }
228
229 /*
230 * Helper functions to copy attribute data in and out of the one disk extents
231 */
232 STATIC int
233 xfs_attr_rmtval_copyout(
234 struct xfs_mount *mp,
235 struct xfs_buf *bp,
236 xfs_ino_t ino,
237 int *offset,
238 int *valuelen,
239 __uint8_t **dst)
240 {
241 char *src = bp->b_addr;
242 xfs_daddr_t bno = bp->b_bn;
243 int len = BBTOB(bp->b_length);
244 int blksize = mp->m_attr_geo->blksize;
245
246 ASSERT(len >= blksize);
247
248 while (len > 0 && *valuelen > 0) {
249 int hdr_size = 0;
250 int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize);
251
252 byte_cnt = min(*valuelen, byte_cnt);
253
254 if (xfs_sb_version_hascrc(&mp->m_sb)) {
255 if (!xfs_attr3_rmt_hdr_ok(src, ino, *offset,
256 byte_cnt, bno)) {
257 xfs_alert(mp,
258 "remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)",
259 bno, *offset, byte_cnt, ino);
260 return -EFSCORRUPTED;
261 }
262 hdr_size = sizeof(struct xfs_attr3_rmt_hdr);
263 }
264
265 memcpy(*dst, src + hdr_size, byte_cnt);
266
267 /* roll buffer forwards */
268 len -= blksize;
269 src += blksize;
270 bno += BTOBB(blksize);
271
272 /* roll attribute data forwards */
273 *valuelen -= byte_cnt;
274 *dst += byte_cnt;
275 *offset += byte_cnt;
276 }
277 return 0;
278 }
279
280 STATIC void
281 xfs_attr_rmtval_copyin(
282 struct xfs_mount *mp,
283 struct xfs_buf *bp,
284 xfs_ino_t ino,
285 int *offset,
286 int *valuelen,
287 __uint8_t **src)
288 {
289 char *dst = bp->b_addr;
290 xfs_daddr_t bno = bp->b_bn;
291 int len = BBTOB(bp->b_length);
292 int blksize = mp->m_attr_geo->blksize;
293
294 ASSERT(len >= blksize);
295
296 while (len > 0 && *valuelen > 0) {
297 int hdr_size;
298 int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize);
299
300 byte_cnt = min(*valuelen, byte_cnt);
301 hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset,
302 byte_cnt, bno);
303
304 memcpy(dst + hdr_size, *src, byte_cnt);
305
306 /*
307 * If this is the last block, zero the remainder of it.
308 * Check that we are actually the last block, too.
309 */
310 if (byte_cnt + hdr_size < blksize) {
311 ASSERT(*valuelen - byte_cnt == 0);
312 ASSERT(len == blksize);
313 memset(dst + hdr_size + byte_cnt, 0,
314 blksize - hdr_size - byte_cnt);
315 }
316
317 /* roll buffer forwards */
318 len -= blksize;
319 dst += blksize;
320 bno += BTOBB(blksize);
321
322 /* roll attribute data forwards */
323 *valuelen -= byte_cnt;
324 *src += byte_cnt;
325 *offset += byte_cnt;
326 }
327 }
328
329 /*
330 * Read the value associated with an attribute from the out-of-line buffer
331 * that we stored it in.
332 */
333 int
334 xfs_attr_rmtval_get(
335 struct xfs_da_args *args)
336 {
337 struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE];
338 struct xfs_mount *mp = args->dp->i_mount;
339 struct xfs_buf *bp;
340 xfs_dablk_t lblkno = args->rmtblkno;
341 __uint8_t *dst = args->value;
342 int valuelen;
343 int nmap;
344 int error;
345 int blkcnt = args->rmtblkcnt;
346 int i;
347 int offset = 0;
348
349 trace_xfs_attr_rmtval_get(args);
350
351 ASSERT(!(args->flags & ATTR_KERNOVAL));
352 ASSERT(args->rmtvaluelen == args->valuelen);
353
354 valuelen = args->rmtvaluelen;
355 while (valuelen > 0) {
356 nmap = ATTR_RMTVALUE_MAPSIZE;
357 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
358 blkcnt, map, &nmap,
359 XFS_BMAPI_ATTRFORK);
360 if (error)
361 return error;
362 ASSERT(nmap >= 1);
363
364 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
365 xfs_daddr_t dblkno;
366 int dblkcnt;
367
368 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
369 (map[i].br_startblock != HOLESTARTBLOCK));
370 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
371 dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
372 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
373 dblkno, dblkcnt, 0, &bp,
374 &xfs_attr3_rmt_buf_ops);
375 if (error)
376 return error;
377
378 error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino,
379 &offset, &valuelen,
380 &dst);
381 xfs_buf_relse(bp);
382 if (error)
383 return error;
384
385 /* roll attribute extent map forwards */
386 lblkno += map[i].br_blockcount;
387 blkcnt -= map[i].br_blockcount;
388 }
389 }
390 ASSERT(valuelen == 0);
391 return 0;
392 }
393
394 /*
395 * Write the value associated with an attribute into the out-of-line buffer
396 * that we have defined for it.
397 */
398 int
399 xfs_attr_rmtval_set(
400 struct xfs_da_args *args)
401 {
402 struct xfs_inode *dp = args->dp;
403 struct xfs_mount *mp = dp->i_mount;
404 struct xfs_bmbt_irec map;
405 xfs_dablk_t lblkno;
406 xfs_fileoff_t lfileoff = 0;
407 __uint8_t *src = args->value;
408 int blkcnt;
409 int valuelen;
410 int nmap;
411 int error;
412 int offset = 0;
413
414 trace_xfs_attr_rmtval_set(args);
415
416 /*
417 * Find a "hole" in the attribute address space large enough for
418 * us to drop the new attribute's value into. Because CRC enable
419 * attributes have headers, we can't just do a straight byte to FSB
420 * conversion and have to take the header space into account.
421 */
422 blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen);
423 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
424 XFS_ATTR_FORK);
425 if (error)
426 return error;
427
428 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
429 args->rmtblkcnt = blkcnt;
430
431 /*
432 * Roll through the "value", allocating blocks on disk as required.
433 */
434 while (blkcnt > 0) {
435 int committed;
436
437 /*
438 * Allocate a single extent, up to the size of the value.
439 */
440 xfs_bmap_init(args->flist, args->firstblock);
441 nmap = 1;
442 error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
443 blkcnt,
444 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
445 args->firstblock, args->total, &map, &nmap,
446 args->flist);
447 if (!error) {
448 error = xfs_bmap_finish(&args->trans, args->flist,
449 &committed);
450 }
451 if (error) {
452 ASSERT(committed);
453 args->trans = NULL;
454 xfs_bmap_cancel(args->flist);
455 return error;
456 }
457
458 /*
459 * bmap_finish() may have committed the last trans and started
460 * a new one. We need the inode to be in all transactions.
461 */
462 if (committed)
463 xfs_trans_ijoin(args->trans, dp, 0);
464
465 ASSERT(nmap == 1);
466 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
467 (map.br_startblock != HOLESTARTBLOCK));
468 lblkno += map.br_blockcount;
469 blkcnt -= map.br_blockcount;
470
471 /*
472 * Start the next trans in the chain.
473 */
474 error = xfs_trans_roll(&args->trans, dp);
475 if (error)
476 return error;
477 }
478
479 /*
480 * Roll through the "value", copying the attribute value to the
481 * already-allocated blocks. Blocks are written synchronously
482 * so that we can know they are all on disk before we turn off
483 * the INCOMPLETE flag.
484 */
485 lblkno = args->rmtblkno;
486 blkcnt = args->rmtblkcnt;
487 valuelen = args->rmtvaluelen;
488 while (valuelen > 0) {
489 struct xfs_buf *bp;
490 xfs_daddr_t dblkno;
491 int dblkcnt;
492
493 ASSERT(blkcnt > 0);
494
495 xfs_bmap_init(args->flist, args->firstblock);
496 nmap = 1;
497 error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
498 blkcnt, &map, &nmap,
499 XFS_BMAPI_ATTRFORK);
500 if (error)
501 return error;
502 ASSERT(nmap == 1);
503 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
504 (map.br_startblock != HOLESTARTBLOCK));
505
506 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
507 dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
508
509 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0);
510 if (!bp)
511 return -ENOMEM;
512 bp->b_ops = &xfs_attr3_rmt_buf_ops;
513
514 xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset,
515 &valuelen, &src);
516
517 error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */
518 xfs_buf_relse(bp);
519 if (error)
520 return error;
521
522
523 /* roll attribute extent map forwards */
524 lblkno += map.br_blockcount;
525 blkcnt -= map.br_blockcount;
526 }
527 ASSERT(valuelen == 0);
528 return 0;
529 }
530
531 /*
532 * Remove the value associated with an attribute by deleting the
533 * out-of-line buffer that it is stored on.
534 */
535 int
536 xfs_attr_rmtval_remove(
537 struct xfs_da_args *args)
538 {
539 struct xfs_mount *mp = args->dp->i_mount;
540 xfs_dablk_t lblkno;
541 int blkcnt;
542 int error;
543 int done;
544
545 trace_xfs_attr_rmtval_remove(args);
546
547 /*
548 * Roll through the "value", invalidating the attribute value's blocks.
549 */
550 lblkno = args->rmtblkno;
551 blkcnt = args->rmtblkcnt;
552 while (blkcnt > 0) {
553 struct xfs_bmbt_irec map;
554 struct xfs_buf *bp;
555 xfs_daddr_t dblkno;
556 int dblkcnt;
557 int nmap;
558
559 /*
560 * Try to remember where we decided to put the value.
561 */
562 nmap = 1;
563 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
564 blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK);
565 if (error)
566 return error;
567 ASSERT(nmap == 1);
568 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
569 (map.br_startblock != HOLESTARTBLOCK));
570
571 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
572 dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
573
574 /*
575 * If the "remote" value is in the cache, remove it.
576 */
577 bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK);
578 if (bp) {
579 xfs_buf_stale(bp);
580 xfs_buf_relse(bp);
581 bp = NULL;
582 }
583
584 lblkno += map.br_blockcount;
585 blkcnt -= map.br_blockcount;
586 }
587
588 /*
589 * Keep de-allocating extents until the remote-value region is gone.
590 */
591 lblkno = args->rmtblkno;
592 blkcnt = args->rmtblkcnt;
593 done = 0;
594 while (!done) {
595 int committed;
596
597 xfs_bmap_init(args->flist, args->firstblock);
598 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
599 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
600 1, args->firstblock, args->flist,
601 &done);
602 if (!error) {
603 error = xfs_bmap_finish(&args->trans, args->flist,
604 &committed);
605 }
606 if (error) {
607 ASSERT(committed);
608 args->trans = NULL;
609 xfs_bmap_cancel(args->flist);
610 return error;
611 }
612
613 /*
614 * bmap_finish() may have committed the last trans and started
615 * a new one. We need the inode to be in all transactions.
616 */
617 if (committed)
618 xfs_trans_ijoin(args->trans, args->dp, 0);
619
620 /*
621 * Close out trans and start the next one in the chain.
622 */
623 error = xfs_trans_roll(&args->trans, args->dp);
624 if (error)
625 return error;
626 }
627 return 0;
628 }
Linux kernel - Deliverables
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