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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_mount.h" | |
27 | #include "xfs_da_format.h" | |
28 | #include "xfs_da_btree.h" | |
29 | #include "xfs_inode.h" | |
30 | #include "xfs_alloc.h" | |
31 | #include "xfs_trans.h" | |
32 | #include "xfs_inode_item.h" | |
33 | #include "xfs_bmap.h" | |
34 | #include "xfs_bmap_util.h" | |
35 | #include "xfs_attr.h" | |
36 | #include "xfs_attr_leaf.h" | |
37 | #include "xfs_attr_remote.h" | |
38 | #include "xfs_trans_space.h" | |
39 | #include "xfs_trace.h" | |
40 | #include "xfs_cksum.h" | |
41 | #include "xfs_buf_item.h" | |
42 | #include "xfs_error.h" | |
43 | ||
44 | #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ | |
45 | ||
46 | /* | |
47 | * Each contiguous block has a header, so it is not just a simple attribute | |
48 | * length to FSB conversion. | |
49 | */ | |
50 | int | |
51 | xfs_attr3_rmt_blocks( | |
52 | struct xfs_mount *mp, | |
53 | int attrlen) | |
54 | { | |
55 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
56 | int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize); | |
57 | return (attrlen + buflen - 1) / buflen; | |
58 | } | |
59 | return XFS_B_TO_FSB(mp, attrlen); | |
60 | } | |
61 | ||
62 | /* | |
63 | * Checking of the remote attribute header is split into two parts. The verifier | |
64 | * does CRC, location and bounds checking, the unpacking function checks the | |
65 | * attribute parameters and owner. | |
66 | */ | |
67 | static bool | |
68 | xfs_attr3_rmt_hdr_ok( | |
69 | void *ptr, | |
70 | xfs_ino_t ino, | |
71 | uint32_t offset, | |
72 | uint32_t size, | |
73 | xfs_daddr_t bno) | |
74 | { | |
75 | struct xfs_attr3_rmt_hdr *rmt = ptr; | |
76 | ||
77 | if (bno != be64_to_cpu(rmt->rm_blkno)) | |
78 | return false; | |
79 | if (offset != be32_to_cpu(rmt->rm_offset)) | |
80 | return false; | |
81 | if (size != be32_to_cpu(rmt->rm_bytes)) | |
82 | return false; | |
83 | if (ino != be64_to_cpu(rmt->rm_owner)) | |
84 | return false; | |
85 | ||
86 | /* ok */ | |
87 | return true; | |
88 | } | |
89 | ||
90 | static bool | |
91 | xfs_attr3_rmt_verify( | |
92 | struct xfs_mount *mp, | |
93 | void *ptr, | |
94 | int fsbsize, | |
95 | xfs_daddr_t bno) | |
96 | { | |
97 | struct xfs_attr3_rmt_hdr *rmt = ptr; | |
98 | ||
99 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
100 | return false; | |
101 | if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC)) | |
102 | return false; | |
103 | if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid)) | |
104 | return false; | |
105 | if (be64_to_cpu(rmt->rm_blkno) != bno) | |
106 | return false; | |
107 | if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt)) | |
108 | return false; | |
109 | if (be32_to_cpu(rmt->rm_offset) + | |
110 | be32_to_cpu(rmt->rm_bytes) > XFS_XATTR_SIZE_MAX) | |
111 | return false; | |
112 | if (rmt->rm_owner == 0) | |
113 | return false; | |
114 | ||
115 | return true; | |
116 | } | |
117 | ||
118 | static void | |
119 | xfs_attr3_rmt_read_verify( | |
120 | struct xfs_buf *bp) | |
121 | { | |
122 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
123 | char *ptr; | |
124 | int len; | |
125 | xfs_daddr_t bno; | |
126 | int blksize = mp->m_attr_geo->blksize; | |
127 | ||
128 | /* no verification of non-crc buffers */ | |
129 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
130 | return; | |
131 | ||
132 | ptr = bp->b_addr; | |
133 | bno = bp->b_bn; | |
134 | len = BBTOB(bp->b_length); | |
135 | ASSERT(len >= blksize); | |
136 | ||
137 | while (len > 0) { | |
138 | if (!xfs_verify_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF)) { | |
139 | xfs_buf_ioerror(bp, -EFSBADCRC); | |
140 | break; | |
141 | } | |
142 | if (!xfs_attr3_rmt_verify(mp, ptr, blksize, bno)) { | |
143 | xfs_buf_ioerror(bp, -EFSCORRUPTED); | |
144 | break; | |
145 | } | |
146 | len -= blksize; | |
147 | ptr += blksize; | |
148 | bno += BTOBB(blksize); | |
149 | } | |
150 | ||
151 | if (bp->b_error) | |
152 | xfs_verifier_error(bp); | |
153 | else | |
154 | ASSERT(len == 0); | |
155 | } | |
156 | ||
157 | static void | |
158 | xfs_attr3_rmt_write_verify( | |
159 | struct xfs_buf *bp) | |
160 | { | |
161 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
162 | int blksize = mp->m_attr_geo->blksize; | |
163 | char *ptr; | |
164 | int len; | |
165 | xfs_daddr_t bno; | |
166 | ||
167 | /* no verification of non-crc buffers */ | |
168 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
169 | return; | |
170 | ||
171 | ptr = bp->b_addr; | |
172 | bno = bp->b_bn; | |
173 | len = BBTOB(bp->b_length); | |
174 | ASSERT(len >= blksize); | |
175 | ||
176 | while (len > 0) { | |
177 | struct xfs_attr3_rmt_hdr *rmt = (struct xfs_attr3_rmt_hdr *)ptr; | |
178 | ||
179 | if (!xfs_attr3_rmt_verify(mp, ptr, blksize, bno)) { | |
180 | xfs_buf_ioerror(bp, -EFSCORRUPTED); | |
181 | xfs_verifier_error(bp); | |
182 | return; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Ensure we aren't writing bogus LSNs to disk. See | |
187 | * xfs_attr3_rmt_hdr_set() for the explanation. | |
188 | */ | |
189 | if (rmt->rm_lsn != cpu_to_be64(NULLCOMMITLSN)) { | |
190 | xfs_buf_ioerror(bp, -EFSCORRUPTED); | |
191 | xfs_verifier_error(bp); | |
192 | return; | |
193 | } | |
194 | xfs_update_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF); | |
195 | ||
196 | len -= blksize; | |
197 | ptr += blksize; | |
198 | bno += BTOBB(blksize); | |
199 | } | |
200 | ASSERT(len == 0); | |
201 | } | |
202 | ||
203 | const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = { | |
204 | .name = "xfs_attr3_rmt", | |
205 | .verify_read = xfs_attr3_rmt_read_verify, | |
206 | .verify_write = xfs_attr3_rmt_write_verify, | |
207 | }; | |
208 | ||
209 | STATIC int | |
210 | xfs_attr3_rmt_hdr_set( | |
211 | struct xfs_mount *mp, | |
212 | void *ptr, | |
213 | xfs_ino_t ino, | |
214 | uint32_t offset, | |
215 | uint32_t size, | |
216 | xfs_daddr_t bno) | |
217 | { | |
218 | struct xfs_attr3_rmt_hdr *rmt = ptr; | |
219 | ||
220 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
221 | return 0; | |
222 | ||
223 | rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC); | |
224 | rmt->rm_offset = cpu_to_be32(offset); | |
225 | rmt->rm_bytes = cpu_to_be32(size); | |
226 | uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid); | |
227 | rmt->rm_owner = cpu_to_be64(ino); | |
228 | rmt->rm_blkno = cpu_to_be64(bno); | |
229 | ||
230 | /* | |
231 | * Remote attribute blocks are written synchronously, so we don't | |
232 | * have an LSN that we can stamp in them that makes any sense to log | |
233 | * recovery. To ensure that log recovery handles overwrites of these | |
234 | * blocks sanely (i.e. once they've been freed and reallocated as some | |
235 | * other type of metadata) we need to ensure that the LSN has a value | |
236 | * that tells log recovery to ignore the LSN and overwrite the buffer | |
237 | * with whatever is in it's log. To do this, we use the magic | |
238 | * NULLCOMMITLSN to indicate that the LSN is invalid. | |
239 | */ | |
240 | rmt->rm_lsn = cpu_to_be64(NULLCOMMITLSN); | |
241 | ||
242 | return sizeof(struct xfs_attr3_rmt_hdr); | |
243 | } | |
244 | ||
245 | /* | |
246 | * Helper functions to copy attribute data in and out of the one disk extents | |
247 | */ | |
248 | STATIC int | |
249 | xfs_attr_rmtval_copyout( | |
250 | struct xfs_mount *mp, | |
251 | struct xfs_buf *bp, | |
252 | xfs_ino_t ino, | |
253 | int *offset, | |
254 | int *valuelen, | |
255 | __uint8_t **dst) | |
256 | { | |
257 | char *src = bp->b_addr; | |
258 | xfs_daddr_t bno = bp->b_bn; | |
259 | int len = BBTOB(bp->b_length); | |
260 | int blksize = mp->m_attr_geo->blksize; | |
261 | ||
262 | ASSERT(len >= blksize); | |
263 | ||
264 | while (len > 0 && *valuelen > 0) { | |
265 | int hdr_size = 0; | |
266 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); | |
267 | ||
268 | byte_cnt = min(*valuelen, byte_cnt); | |
269 | ||
270 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
271 | if (!xfs_attr3_rmt_hdr_ok(src, ino, *offset, | |
272 | byte_cnt, bno)) { | |
273 | xfs_alert(mp, | |
274 | "remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)", | |
275 | bno, *offset, byte_cnt, ino); | |
276 | return -EFSCORRUPTED; | |
277 | } | |
278 | hdr_size = sizeof(struct xfs_attr3_rmt_hdr); | |
279 | } | |
280 | ||
281 | memcpy(*dst, src + hdr_size, byte_cnt); | |
282 | ||
283 | /* roll buffer forwards */ | |
284 | len -= blksize; | |
285 | src += blksize; | |
286 | bno += BTOBB(blksize); | |
287 | ||
288 | /* roll attribute data forwards */ | |
289 | *valuelen -= byte_cnt; | |
290 | *dst += byte_cnt; | |
291 | *offset += byte_cnt; | |
292 | } | |
293 | return 0; | |
294 | } | |
295 | ||
296 | STATIC void | |
297 | xfs_attr_rmtval_copyin( | |
298 | struct xfs_mount *mp, | |
299 | struct xfs_buf *bp, | |
300 | xfs_ino_t ino, | |
301 | int *offset, | |
302 | int *valuelen, | |
303 | __uint8_t **src) | |
304 | { | |
305 | char *dst = bp->b_addr; | |
306 | xfs_daddr_t bno = bp->b_bn; | |
307 | int len = BBTOB(bp->b_length); | |
308 | int blksize = mp->m_attr_geo->blksize; | |
309 | ||
310 | ASSERT(len >= blksize); | |
311 | ||
312 | while (len > 0 && *valuelen > 0) { | |
313 | int hdr_size; | |
314 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); | |
315 | ||
316 | byte_cnt = min(*valuelen, byte_cnt); | |
317 | hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset, | |
318 | byte_cnt, bno); | |
319 | ||
320 | memcpy(dst + hdr_size, *src, byte_cnt); | |
321 | ||
322 | /* | |
323 | * If this is the last block, zero the remainder of it. | |
324 | * Check that we are actually the last block, too. | |
325 | */ | |
326 | if (byte_cnt + hdr_size < blksize) { | |
327 | ASSERT(*valuelen - byte_cnt == 0); | |
328 | ASSERT(len == blksize); | |
329 | memset(dst + hdr_size + byte_cnt, 0, | |
330 | blksize - hdr_size - byte_cnt); | |
331 | } | |
332 | ||
333 | /* roll buffer forwards */ | |
334 | len -= blksize; | |
335 | dst += blksize; | |
336 | bno += BTOBB(blksize); | |
337 | ||
338 | /* roll attribute data forwards */ | |
339 | *valuelen -= byte_cnt; | |
340 | *src += byte_cnt; | |
341 | *offset += byte_cnt; | |
342 | } | |
343 | } | |
344 | ||
345 | /* | |
346 | * Read the value associated with an attribute from the out-of-line buffer | |
347 | * that we stored it in. | |
348 | */ | |
349 | int | |
350 | xfs_attr_rmtval_get( | |
351 | struct xfs_da_args *args) | |
352 | { | |
353 | struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE]; | |
354 | struct xfs_mount *mp = args->dp->i_mount; | |
355 | struct xfs_buf *bp; | |
356 | xfs_dablk_t lblkno = args->rmtblkno; | |
357 | __uint8_t *dst = args->value; | |
358 | int valuelen; | |
359 | int nmap; | |
360 | int error; | |
361 | int blkcnt = args->rmtblkcnt; | |
362 | int i; | |
363 | int offset = 0; | |
364 | ||
365 | trace_xfs_attr_rmtval_get(args); | |
366 | ||
367 | ASSERT(!(args->flags & ATTR_KERNOVAL)); | |
368 | ASSERT(args->rmtvaluelen == args->valuelen); | |
369 | ||
370 | valuelen = args->rmtvaluelen; | |
371 | while (valuelen > 0) { | |
372 | nmap = ATTR_RMTVALUE_MAPSIZE; | |
373 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
374 | blkcnt, map, &nmap, | |
375 | XFS_BMAPI_ATTRFORK); | |
376 | if (error) | |
377 | return error; | |
378 | ASSERT(nmap >= 1); | |
379 | ||
380 | for (i = 0; (i < nmap) && (valuelen > 0); i++) { | |
381 | xfs_daddr_t dblkno; | |
382 | int dblkcnt; | |
383 | ||
384 | ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && | |
385 | (map[i].br_startblock != HOLESTARTBLOCK)); | |
386 | dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); | |
387 | dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); | |
388 | error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, | |
389 | dblkno, dblkcnt, 0, &bp, | |
390 | &xfs_attr3_rmt_buf_ops); | |
391 | if (error) | |
392 | return error; | |
393 | ||
394 | error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino, | |
395 | &offset, &valuelen, | |
396 | &dst); | |
397 | xfs_buf_relse(bp); | |
398 | if (error) | |
399 | return error; | |
400 | ||
401 | /* roll attribute extent map forwards */ | |
402 | lblkno += map[i].br_blockcount; | |
403 | blkcnt -= map[i].br_blockcount; | |
404 | } | |
405 | } | |
406 | ASSERT(valuelen == 0); | |
407 | return 0; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Write the value associated with an attribute into the out-of-line buffer | |
412 | * that we have defined for it. | |
413 | */ | |
414 | int | |
415 | xfs_attr_rmtval_set( | |
416 | struct xfs_da_args *args) | |
417 | { | |
418 | struct xfs_inode *dp = args->dp; | |
419 | struct xfs_mount *mp = dp->i_mount; | |
420 | struct xfs_bmbt_irec map; | |
421 | xfs_dablk_t lblkno; | |
422 | xfs_fileoff_t lfileoff = 0; | |
423 | __uint8_t *src = args->value; | |
424 | int blkcnt; | |
425 | int valuelen; | |
426 | int nmap; | |
427 | int error; | |
428 | int offset = 0; | |
429 | ||
430 | trace_xfs_attr_rmtval_set(args); | |
431 | ||
432 | /* | |
433 | * Find a "hole" in the attribute address space large enough for | |
434 | * us to drop the new attribute's value into. Because CRC enable | |
435 | * attributes have headers, we can't just do a straight byte to FSB | |
436 | * conversion and have to take the header space into account. | |
437 | */ | |
438 | blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen); | |
439 | error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, | |
440 | XFS_ATTR_FORK); | |
441 | if (error) | |
442 | return error; | |
443 | ||
444 | args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff; | |
445 | args->rmtblkcnt = blkcnt; | |
446 | ||
447 | /* | |
448 | * Roll through the "value", allocating blocks on disk as required. | |
449 | */ | |
450 | while (blkcnt > 0) { | |
451 | int committed; | |
452 | ||
453 | /* | |
454 | * Allocate a single extent, up to the size of the value. | |
455 | * | |
456 | * Note that we have to consider this a data allocation as we | |
457 | * write the remote attribute without logging the contents. | |
458 | * Hence we must ensure that we aren't using blocks that are on | |
459 | * the busy list so that we don't overwrite blocks which have | |
460 | * recently been freed but their transactions are not yet | |
461 | * committed to disk. If we overwrite the contents of a busy | |
462 | * extent and then crash then the block may not contain the | |
463 | * correct metadata after log recovery occurs. | |
464 | */ | |
465 | xfs_bmap_init(args->flist, args->firstblock); | |
466 | nmap = 1; | |
467 | error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno, | |
468 | blkcnt, XFS_BMAPI_ATTRFORK, args->firstblock, | |
469 | args->total, &map, &nmap, args->flist); | |
470 | if (!error) { | |
471 | error = xfs_bmap_finish(&args->trans, args->flist, | |
472 | &committed); | |
473 | } | |
474 | if (error) { | |
475 | ASSERT(committed); | |
476 | args->trans = NULL; | |
477 | xfs_bmap_cancel(args->flist); | |
478 | return error; | |
479 | } | |
480 | ||
481 | /* | |
482 | * bmap_finish() may have committed the last trans and started | |
483 | * a new one. We need the inode to be in all transactions. | |
484 | */ | |
485 | if (committed) | |
486 | xfs_trans_ijoin(args->trans, dp, 0); | |
487 | ||
488 | ASSERT(nmap == 1); | |
489 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
490 | (map.br_startblock != HOLESTARTBLOCK)); | |
491 | lblkno += map.br_blockcount; | |
492 | blkcnt -= map.br_blockcount; | |
493 | ||
494 | /* | |
495 | * Start the next trans in the chain. | |
496 | */ | |
497 | error = xfs_trans_roll(&args->trans, dp); | |
498 | if (error) | |
499 | return error; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Roll through the "value", copying the attribute value to the | |
504 | * already-allocated blocks. Blocks are written synchronously | |
505 | * so that we can know they are all on disk before we turn off | |
506 | * the INCOMPLETE flag. | |
507 | */ | |
508 | lblkno = args->rmtblkno; | |
509 | blkcnt = args->rmtblkcnt; | |
510 | valuelen = args->rmtvaluelen; | |
511 | while (valuelen > 0) { | |
512 | struct xfs_buf *bp; | |
513 | xfs_daddr_t dblkno; | |
514 | int dblkcnt; | |
515 | ||
516 | ASSERT(blkcnt > 0); | |
517 | ||
518 | xfs_bmap_init(args->flist, args->firstblock); | |
519 | nmap = 1; | |
520 | error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno, | |
521 | blkcnt, &map, &nmap, | |
522 | XFS_BMAPI_ATTRFORK); | |
523 | if (error) | |
524 | return error; | |
525 | ASSERT(nmap == 1); | |
526 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
527 | (map.br_startblock != HOLESTARTBLOCK)); | |
528 | ||
529 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), | |
530 | dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); | |
531 | ||
532 | bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0); | |
533 | if (!bp) | |
534 | return -ENOMEM; | |
535 | bp->b_ops = &xfs_attr3_rmt_buf_ops; | |
536 | ||
537 | xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset, | |
538 | &valuelen, &src); | |
539 | ||
540 | error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ | |
541 | xfs_buf_relse(bp); | |
542 | if (error) | |
543 | return error; | |
544 | ||
545 | ||
546 | /* roll attribute extent map forwards */ | |
547 | lblkno += map.br_blockcount; | |
548 | blkcnt -= map.br_blockcount; | |
549 | } | |
550 | ASSERT(valuelen == 0); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | /* | |
555 | * Remove the value associated with an attribute by deleting the | |
556 | * out-of-line buffer that it is stored on. | |
557 | */ | |
558 | int | |
559 | xfs_attr_rmtval_remove( | |
560 | struct xfs_da_args *args) | |
561 | { | |
562 | struct xfs_mount *mp = args->dp->i_mount; | |
563 | xfs_dablk_t lblkno; | |
564 | int blkcnt; | |
565 | int error; | |
566 | int done; | |
567 | ||
568 | trace_xfs_attr_rmtval_remove(args); | |
569 | ||
570 | /* | |
571 | * Roll through the "value", invalidating the attribute value's blocks. | |
572 | */ | |
573 | lblkno = args->rmtblkno; | |
574 | blkcnt = args->rmtblkcnt; | |
575 | while (blkcnt > 0) { | |
576 | struct xfs_bmbt_irec map; | |
577 | struct xfs_buf *bp; | |
578 | xfs_daddr_t dblkno; | |
579 | int dblkcnt; | |
580 | int nmap; | |
581 | ||
582 | /* | |
583 | * Try to remember where we decided to put the value. | |
584 | */ | |
585 | nmap = 1; | |
586 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
587 | blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); | |
588 | if (error) | |
589 | return error; | |
590 | ASSERT(nmap == 1); | |
591 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
592 | (map.br_startblock != HOLESTARTBLOCK)); | |
593 | ||
594 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), | |
595 | dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); | |
596 | ||
597 | /* | |
598 | * If the "remote" value is in the cache, remove it. | |
599 | */ | |
600 | bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK); | |
601 | if (bp) { | |
602 | xfs_buf_stale(bp); | |
603 | xfs_buf_relse(bp); | |
604 | bp = NULL; | |
605 | } | |
606 | ||
607 | lblkno += map.br_blockcount; | |
608 | blkcnt -= map.br_blockcount; | |
609 | } | |
610 | ||
611 | /* | |
612 | * Keep de-allocating extents until the remote-value region is gone. | |
613 | */ | |
614 | lblkno = args->rmtblkno; | |
615 | blkcnt = args->rmtblkcnt; | |
616 | done = 0; | |
617 | while (!done) { | |
618 | int committed; | |
619 | ||
620 | xfs_bmap_init(args->flist, args->firstblock); | |
621 | error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, | |
622 | XFS_BMAPI_ATTRFORK, 1, args->firstblock, | |
623 | args->flist, &done); | |
624 | if (!error) { | |
625 | error = xfs_bmap_finish(&args->trans, args->flist, | |
626 | &committed); | |
627 | } | |
628 | if (error) { | |
629 | ASSERT(committed); | |
630 | args->trans = NULL; | |
631 | xfs_bmap_cancel(args->flist); | |
632 | return error; | |
633 | } | |
634 | ||
635 | /* | |
636 | * bmap_finish() may have committed the last trans and started | |
637 | * a new one. We need the inode to be in all transactions. | |
638 | */ | |
639 | if (committed) | |
640 | xfs_trans_ijoin(args->trans, args->dp, 0); | |
641 | ||
642 | /* | |
643 | * Close out trans and start the next one in the chain. | |
644 | */ | |
645 | error = xfs_trans_roll(&args->trans, args->dp); | |
646 | if (error) | |
647 | return error; | |
648 | } | |
649 | return 0; | |
650 | } |