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Linux 3.12.5
[linux/fpc-iii.git] / fs / xfs / xfs_attr_remote.c
blob712a502de619b097df202f744ba481bd3471847d
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_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 /* # 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 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 /* ok */
90 return true;
91 }
92
93 static bool
94 xfs_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
121 static void
122 xfs_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 /* no verification of non-crc buffers */
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
162 static void
163 xfs_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 /* no verification of non-crc buffers */
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
203 const 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
208 STATIC int
209 xfs_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 * Helper functions to copy attribute data in and out of the one disk extents
234 */
235 STATIC int
236 xfs_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 /* roll buffer forwards */
270 len -= XFS_LBSIZE(mp);
271 src += XFS_LBSIZE(mp);
272 bno += mp->m_bsize;
273
274 /* roll attribute data forwards */
275 *valuelen -= byte_cnt;
276 *dst += byte_cnt;
277 *offset += byte_cnt;
278 }
279 return 0;
280 }
281
282 STATIC void
283 xfs_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 * If this is the last block, zero the remainder of it.
309 * Check that we are actually the last block, too.
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 /* roll buffer forwards */
319 len -= XFS_LBSIZE(mp);
320 dst += XFS_LBSIZE(mp);
321 bno += mp->m_bsize;
322
323 /* roll attribute data forwards */
324 *valuelen -= byte_cnt;
325 *src += byte_cnt;
326 *offset += byte_cnt;
327 }
328 }
329
330 /*
331 * Read the value associated with an attribute from the out-of-line buffer
332 * that we stored it in.
333 */
334 int
335 xfs_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 /* roll attribute extent map forwards */
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 * Write the value associated with an attribute into the out-of-line buffer
395 * that we have defined for it.
396 */
397 int
398 xfs_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 * Find a "hole" in the attribute address space large enough for
417 * us to drop the new attribute's value into. Because CRC enable
418 * attributes have headers, we can't just do a straight byte to FSB
419 * conversion and have to take the header space into account.
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 * Roll through the "value", allocating blocks on disk as required.
432 */
433 while (blkcnt > 0) {
434 int committed;
435
436 /*
437 * Allocate a single extent, up to the size of the value.
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 * bmap_finish() may have committed the last trans and started
459 * a new one. We need the inode to be in all transactions.
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 * Start the next trans in the chain.
472 */
473 error = xfs_trans_roll(&args->trans, dp);
474 if (error)
475 return (error);
476 }
477
478 /*
479 * Roll through the "value", copying the attribute value to the
480 * already-allocated blocks. Blocks are written synchronously
481 * so that we can know they are all on disk before we turn off
482 * the INCOMPLETE flag.
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); /* GROT: NOTE: synchronous write */
517 xfs_buf_relse(bp);
518 if (error)
519 return error;
520
521
522 /* roll attribute extent map forwards */
523 lblkno += map.br_blockcount;
524 blkcnt -= map.br_blockcount;
525 }
526 ASSERT(valuelen == 0);
527 return 0;
528 }
529
530 /*
531 * Remove the value associated with an attribute by deleting the
532 * out-of-line buffer that it is stored on.
533 */
534 int
535 xfs_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 * Roll through the "value", invalidating the attribute value's blocks.
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 * Try to remember where we decided to put the value.
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 * If the "remote" value is in the cache, remove it.
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 * Keep de-allocating extents until the remote-value region is gone.
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 * bmap_finish() may have committed the last trans and started
614 * a new one. We need the inode to be in all transactions.
615 */
616 if (committed)
617 xfs_trans_ijoin(args->trans, args->dp, 0);
618
619 /*
620 * Close out trans and start the next one in the chain.
621 */
622 error = xfs_trans_roll(&args->trans, args->dp);
623 if (error)
624 return (error);
625 }
626 return(0);
627 }
Linux with added FPC-III support