]>
Commit | Line | Data |
---|---|---|
9d6fabc0 DC |
1 | /* |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. | |
59915981 | 3 | * Copyright (c) 2013 Red Hat, Inc. |
9d6fabc0 DC |
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 | */ | |
9c799827 | 19 | #include "libxfs_priv.h" |
b626fb59 DC |
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" | |
f944d3d0 | 27 | #include "xfs_defer.h" |
b626fb59 DC |
28 | #include "xfs_da_format.h" |
29 | #include "xfs_da_btree.h" | |
30 | #include "xfs_inode.h" | |
31 | #include "xfs_alloc.h" | |
32 | #include "xfs_trans.h" | |
33 | #include "xfs_bmap.h" | |
34 | #include "xfs_attr_leaf.h" | |
35 | #include "xfs_attr_remote.h" | |
36 | #include "xfs_trans_space.h" | |
37 | #include "xfs_trace.h" | |
38 | #include "xfs_cksum.h" | |
9d6fabc0 DC |
39 | |
40 | #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ | |
41 | ||
59915981 DC |
42 | /* |
43 | * Each contiguous block has a header, so it is not just a simple attribute | |
44 | * length to FSB conversion. | |
45 | */ | |
f08bc2a9 | 46 | int |
59915981 DC |
47 | xfs_attr3_rmt_blocks( |
48 | struct xfs_mount *mp, | |
49 | int attrlen) | |
50 | { | |
72e78b51 DC |
51 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
52 | int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize); | |
53 | return (attrlen + buflen - 1) / buflen; | |
54 | } | |
55 | return XFS_B_TO_FSB(mp, attrlen); | |
59915981 DC |
56 | } |
57 | ||
f08bc2a9 DC |
58 | /* |
59 | * Checking of the remote attribute header is split into two parts. The verifier | |
60 | * does CRC, location and bounds checking, the unpacking function checks the | |
61 | * attribute parameters and owner. | |
62 | */ | |
bc01119d | 63 | static xfs_failaddr_t |
f08bc2a9 | 64 | xfs_attr3_rmt_hdr_ok( |
f08bc2a9 DC |
65 | void *ptr, |
66 | xfs_ino_t ino, | |
67 | uint32_t offset, | |
68 | uint32_t size, | |
69 | xfs_daddr_t bno) | |
70 | { | |
71 | struct xfs_attr3_rmt_hdr *rmt = ptr; | |
72 | ||
73 | if (bno != be64_to_cpu(rmt->rm_blkno)) | |
bc01119d | 74 | return __this_address; |
f08bc2a9 | 75 | if (offset != be32_to_cpu(rmt->rm_offset)) |
bc01119d | 76 | return __this_address; |
f08bc2a9 | 77 | if (size != be32_to_cpu(rmt->rm_bytes)) |
bc01119d | 78 | return __this_address; |
f08bc2a9 | 79 | if (ino != be64_to_cpu(rmt->rm_owner)) |
bc01119d | 80 | return __this_address; |
f08bc2a9 DC |
81 | |
82 | /* ok */ | |
bc01119d | 83 | return NULL; |
f08bc2a9 DC |
84 | } |
85 | ||
bc01119d | 86 | static xfs_failaddr_t |
59915981 | 87 | xfs_attr3_rmt_verify( |
f08bc2a9 DC |
88 | struct xfs_mount *mp, |
89 | void *ptr, | |
90 | int fsbsize, | |
91 | xfs_daddr_t bno) | |
59915981 | 92 | { |
f08bc2a9 | 93 | struct xfs_attr3_rmt_hdr *rmt = ptr; |
59915981 DC |
94 | |
95 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
bc01119d | 96 | return __this_address; |
59915981 | 97 | if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC)) |
bc01119d | 98 | return __this_address; |
9c4e12fb | 99 | if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid)) |
bc01119d | 100 | return __this_address; |
f08bc2a9 | 101 | if (be64_to_cpu(rmt->rm_blkno) != bno) |
bc01119d | 102 | return __this_address; |
f08bc2a9 | 103 | if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt)) |
bc01119d | 104 | return __this_address; |
59915981 | 105 | if (be32_to_cpu(rmt->rm_offset) + |
ec9d24e9 | 106 | be32_to_cpu(rmt->rm_bytes) > XFS_XATTR_SIZE_MAX) |
bc01119d | 107 | return __this_address; |
59915981 | 108 | if (rmt->rm_owner == 0) |
bc01119d | 109 | return __this_address; |
59915981 | 110 | |
bc01119d | 111 | return NULL; |
59915981 DC |
112 | } |
113 | ||
95d9582b DW |
114 | static int |
115 | __xfs_attr3_rmt_read_verify( | |
116 | struct xfs_buf *bp, | |
117 | bool check_crc, | |
118 | xfs_failaddr_t *failaddr) | |
59915981 DC |
119 | { |
120 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
f08bc2a9 DC |
121 | char *ptr; |
122 | int len; | |
f08bc2a9 | 123 | xfs_daddr_t bno; |
ff105f75 | 124 | int blksize = mp->m_attr_geo->blksize; |
59915981 DC |
125 | |
126 | /* no verification of non-crc buffers */ | |
127 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
95d9582b | 128 | return 0; |
59915981 | 129 | |
f08bc2a9 DC |
130 | ptr = bp->b_addr; |
131 | bno = bp->b_bn; | |
132 | len = BBTOB(bp->b_length); | |
ff105f75 | 133 | ASSERT(len >= blksize); |
f08bc2a9 DC |
134 | |
135 | while (len > 0) { | |
95d9582b DW |
136 | if (check_crc && |
137 | !xfs_verify_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF)) { | |
138 | *failaddr = __this_address; | |
139 | return -EFSBADCRC; | |
f08bc2a9 | 140 | } |
95d9582b DW |
141 | *failaddr = xfs_attr3_rmt_verify(mp, ptr, blksize, bno); |
142 | if (*failaddr) | |
143 | return -EFSCORRUPTED; | |
ff105f75 DC |
144 | len -= blksize; |
145 | ptr += blksize; | |
146 | bno += BTOBB(blksize); | |
f08bc2a9 DC |
147 | } |
148 | ||
95d9582b DW |
149 | if (len != 0) { |
150 | *failaddr = __this_address; | |
151 | return -EFSCORRUPTED; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static void | |
158 | xfs_attr3_rmt_read_verify( | |
159 | struct xfs_buf *bp) | |
160 | { | |
161 | xfs_failaddr_t fa; | |
162 | int error; | |
163 | ||
164 | error = __xfs_attr3_rmt_read_verify(bp, true, &fa); | |
165 | if (error) | |
166 | xfs_verifier_error(bp, error, fa); | |
167 | } | |
168 | ||
169 | static xfs_failaddr_t | |
170 | xfs_attr3_rmt_verify_struct( | |
171 | struct xfs_buf *bp) | |
172 | { | |
173 | xfs_failaddr_t fa; | |
174 | int error; | |
175 | ||
176 | error = __xfs_attr3_rmt_read_verify(bp, false, &fa); | |
177 | return error ? fa : NULL; | |
59915981 DC |
178 | } |
179 | ||
180 | static void | |
181 | xfs_attr3_rmt_write_verify( | |
182 | struct xfs_buf *bp) | |
183 | { | |
184 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
1e697959 | 185 | xfs_failaddr_t fa; |
d9241d7e | 186 | int blksize = mp->m_attr_geo->blksize; |
f08bc2a9 DC |
187 | char *ptr; |
188 | int len; | |
189 | xfs_daddr_t bno; | |
59915981 DC |
190 | |
191 | /* no verification of non-crc buffers */ | |
192 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
193 | return; | |
194 | ||
f08bc2a9 DC |
195 | ptr = bp->b_addr; |
196 | bno = bp->b_bn; | |
197 | len = BBTOB(bp->b_length); | |
ff105f75 | 198 | ASSERT(len >= blksize); |
f08bc2a9 DC |
199 | |
200 | while (len > 0) { | |
d9241d7e DC |
201 | struct xfs_attr3_rmt_hdr *rmt = (struct xfs_attr3_rmt_hdr *)ptr; |
202 | ||
1e697959 DW |
203 | fa = xfs_attr3_rmt_verify(mp, ptr, blksize, bno); |
204 | if (fa) { | |
205 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
f08bc2a9 DC |
206 | return; |
207 | } | |
59915981 | 208 | |
d9241d7e DC |
209 | /* |
210 | * Ensure we aren't writing bogus LSNs to disk. See | |
211 | * xfs_attr3_rmt_hdr_set() for the explanation. | |
212 | */ | |
213 | if (rmt->rm_lsn != cpu_to_be64(NULLCOMMITLSN)) { | |
1e697959 | 214 | xfs_verifier_error(bp, -EFSCORRUPTED, __this_address); |
d9241d7e | 215 | return; |
f08bc2a9 | 216 | } |
ff105f75 | 217 | xfs_update_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF); |
f08bc2a9 | 218 | |
ff105f75 DC |
219 | len -= blksize; |
220 | ptr += blksize; | |
221 | bno += BTOBB(blksize); | |
59915981 | 222 | } |
7e6c95f1 DW |
223 | |
224 | if (len != 0) | |
1e697959 | 225 | xfs_verifier_error(bp, -EFSCORRUPTED, __this_address); |
59915981 DC |
226 | } |
227 | ||
228 | const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = { | |
a3fac935 | 229 | .name = "xfs_attr3_rmt", |
59915981 DC |
230 | .verify_read = xfs_attr3_rmt_read_verify, |
231 | .verify_write = xfs_attr3_rmt_write_verify, | |
95d9582b | 232 | .verify_struct = xfs_attr3_rmt_verify_struct, |
59915981 DC |
233 | }; |
234 | ||
f08bc2a9 | 235 | STATIC int |
59915981 DC |
236 | xfs_attr3_rmt_hdr_set( |
237 | struct xfs_mount *mp, | |
f08bc2a9 | 238 | void *ptr, |
59915981 DC |
239 | xfs_ino_t ino, |
240 | uint32_t offset, | |
241 | uint32_t size, | |
f08bc2a9 | 242 | xfs_daddr_t bno) |
59915981 | 243 | { |
f08bc2a9 | 244 | struct xfs_attr3_rmt_hdr *rmt = ptr; |
59915981 DC |
245 | |
246 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
247 | return 0; | |
248 | ||
249 | rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC); | |
250 | rmt->rm_offset = cpu_to_be32(offset); | |
251 | rmt->rm_bytes = cpu_to_be32(size); | |
9c4e12fb | 252 | uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid); |
59915981 | 253 | rmt->rm_owner = cpu_to_be64(ino); |
f08bc2a9 | 254 | rmt->rm_blkno = cpu_to_be64(bno); |
59915981 | 255 | |
d9241d7e DC |
256 | /* |
257 | * Remote attribute blocks are written synchronously, so we don't | |
258 | * have an LSN that we can stamp in them that makes any sense to log | |
259 | * recovery. To ensure that log recovery handles overwrites of these | |
260 | * blocks sanely (i.e. once they've been freed and reallocated as some | |
261 | * other type of metadata) we need to ensure that the LSN has a value | |
262 | * that tells log recovery to ignore the LSN and overwrite the buffer | |
263 | * with whatever is in it's log. To do this, we use the magic | |
264 | * NULLCOMMITLSN to indicate that the LSN is invalid. | |
265 | */ | |
266 | rmt->rm_lsn = cpu_to_be64(NULLCOMMITLSN); | |
267 | ||
59915981 DC |
268 | return sizeof(struct xfs_attr3_rmt_hdr); |
269 | } | |
270 | ||
271 | /* | |
f08bc2a9 | 272 | * Helper functions to copy attribute data in and out of the one disk extents |
59915981 | 273 | */ |
f08bc2a9 DC |
274 | STATIC int |
275 | xfs_attr_rmtval_copyout( | |
276 | struct xfs_mount *mp, | |
277 | struct xfs_buf *bp, | |
278 | xfs_ino_t ino, | |
279 | int *offset, | |
280 | int *valuelen, | |
4a492e72 | 281 | uint8_t **dst) |
59915981 | 282 | { |
f08bc2a9 DC |
283 | char *src = bp->b_addr; |
284 | xfs_daddr_t bno = bp->b_bn; | |
285 | int len = BBTOB(bp->b_length); | |
ff105f75 | 286 | int blksize = mp->m_attr_geo->blksize; |
59915981 | 287 | |
ff105f75 | 288 | ASSERT(len >= blksize); |
59915981 | 289 | |
f08bc2a9 DC |
290 | while (len > 0 && *valuelen > 0) { |
291 | int hdr_size = 0; | |
ff105f75 | 292 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); |
f08bc2a9 DC |
293 | |
294 | byte_cnt = min(*valuelen, byte_cnt); | |
295 | ||
296 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
bc01119d | 297 | if (xfs_attr3_rmt_hdr_ok(src, ino, *offset, |
f08bc2a9 DC |
298 | byte_cnt, bno)) { |
299 | xfs_alert(mp, | |
300 | "remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)", | |
301 | bno, *offset, byte_cnt, ino); | |
12b53197 | 302 | return -EFSCORRUPTED; |
f08bc2a9 DC |
303 | } |
304 | hdr_size = sizeof(struct xfs_attr3_rmt_hdr); | |
305 | } | |
306 | ||
307 | memcpy(*dst, src + hdr_size, byte_cnt); | |
308 | ||
309 | /* roll buffer forwards */ | |
ff105f75 DC |
310 | len -= blksize; |
311 | src += blksize; | |
312 | bno += BTOBB(blksize); | |
f08bc2a9 DC |
313 | |
314 | /* roll attribute data forwards */ | |
315 | *valuelen -= byte_cnt; | |
316 | *dst += byte_cnt; | |
317 | *offset += byte_cnt; | |
318 | } | |
319 | return 0; | |
320 | } | |
321 | ||
322 | STATIC void | |
323 | xfs_attr_rmtval_copyin( | |
324 | struct xfs_mount *mp, | |
325 | struct xfs_buf *bp, | |
326 | xfs_ino_t ino, | |
327 | int *offset, | |
328 | int *valuelen, | |
4a492e72 | 329 | uint8_t **src) |
f08bc2a9 DC |
330 | { |
331 | char *dst = bp->b_addr; | |
332 | xfs_daddr_t bno = bp->b_bn; | |
333 | int len = BBTOB(bp->b_length); | |
ff105f75 | 334 | int blksize = mp->m_attr_geo->blksize; |
f08bc2a9 | 335 | |
ff105f75 | 336 | ASSERT(len >= blksize); |
f08bc2a9 DC |
337 | |
338 | while (len > 0 && *valuelen > 0) { | |
339 | int hdr_size; | |
ff105f75 | 340 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); |
f08bc2a9 DC |
341 | |
342 | byte_cnt = min(*valuelen, byte_cnt); | |
343 | hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset, | |
344 | byte_cnt, bno); | |
345 | ||
346 | memcpy(dst + hdr_size, *src, byte_cnt); | |
347 | ||
348 | /* | |
349 | * If this is the last block, zero the remainder of it. | |
350 | * Check that we are actually the last block, too. | |
351 | */ | |
ff105f75 | 352 | if (byte_cnt + hdr_size < blksize) { |
f08bc2a9 | 353 | ASSERT(*valuelen - byte_cnt == 0); |
ff105f75 | 354 | ASSERT(len == blksize); |
f08bc2a9 | 355 | memset(dst + hdr_size + byte_cnt, 0, |
ff105f75 | 356 | blksize - hdr_size - byte_cnt); |
f08bc2a9 DC |
357 | } |
358 | ||
359 | /* roll buffer forwards */ | |
ff105f75 DC |
360 | len -= blksize; |
361 | dst += blksize; | |
362 | bno += BTOBB(blksize); | |
f08bc2a9 DC |
363 | |
364 | /* roll attribute data forwards */ | |
365 | *valuelen -= byte_cnt; | |
366 | *src += byte_cnt; | |
367 | *offset += byte_cnt; | |
368 | } | |
59915981 DC |
369 | } |
370 | ||
9d6fabc0 DC |
371 | /* |
372 | * Read the value associated with an attribute from the out-of-line buffer | |
373 | * that we stored it in. | |
374 | */ | |
375 | int | |
59915981 DC |
376 | xfs_attr_rmtval_get( |
377 | struct xfs_da_args *args) | |
9d6fabc0 | 378 | { |
59915981 DC |
379 | struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE]; |
380 | struct xfs_mount *mp = args->dp->i_mount; | |
381 | struct xfs_buf *bp; | |
59915981 | 382 | xfs_dablk_t lblkno = args->rmtblkno; |
4a492e72 | 383 | uint8_t *dst = args->value; |
ff105f75 | 384 | int valuelen; |
59915981 DC |
385 | int nmap; |
386 | int error; | |
f08bc2a9 | 387 | int blkcnt = args->rmtblkcnt; |
59915981 DC |
388 | int i; |
389 | int offset = 0; | |
9d6fabc0 DC |
390 | |
391 | trace_xfs_attr_rmtval_get(args); | |
392 | ||
393 | ASSERT(!(args->flags & ATTR_KERNOVAL)); | |
ff105f75 | 394 | ASSERT(args->rmtvaluelen == args->valuelen); |
9d6fabc0 | 395 | |
ff105f75 | 396 | valuelen = args->rmtvaluelen; |
9d6fabc0 DC |
397 | while (valuelen > 0) { |
398 | nmap = ATTR_RMTVALUE_MAPSIZE; | |
399 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
72e78b51 | 400 | blkcnt, map, &nmap, |
9d6fabc0 DC |
401 | XFS_BMAPI_ATTRFORK); |
402 | if (error) | |
59915981 | 403 | return error; |
9d6fabc0 DC |
404 | ASSERT(nmap >= 1); |
405 | ||
406 | for (i = 0; (i < nmap) && (valuelen > 0); i++) { | |
f08bc2a9 DC |
407 | xfs_daddr_t dblkno; |
408 | int dblkcnt; | |
59915981 | 409 | |
9d6fabc0 DC |
410 | ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && |
411 | (map[i].br_startblock != HOLESTARTBLOCK)); | |
412 | dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); | |
f08bc2a9 | 413 | dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); |
b2d5ffd5 DW |
414 | error = xfs_trans_read_buf(mp, args->trans, |
415 | mp->m_ddev_targp, | |
f08bc2a9 | 416 | dblkno, dblkcnt, 0, &bp, |
59915981 | 417 | &xfs_attr3_rmt_buf_ops); |
9d6fabc0 | 418 | if (error) |
59915981 DC |
419 | return error; |
420 | ||
f08bc2a9 DC |
421 | error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino, |
422 | &offset, &valuelen, | |
423 | &dst); | |
b2d5ffd5 | 424 | xfs_trans_brelse(args->trans, bp); |
f08bc2a9 DC |
425 | if (error) |
426 | return error; | |
59915981 | 427 | |
f08bc2a9 | 428 | /* roll attribute extent map forwards */ |
9d6fabc0 | 429 | lblkno += map[i].br_blockcount; |
f08bc2a9 | 430 | blkcnt -= map[i].br_blockcount; |
9d6fabc0 DC |
431 | } |
432 | } | |
433 | ASSERT(valuelen == 0); | |
59915981 | 434 | return 0; |
9d6fabc0 DC |
435 | } |
436 | ||
437 | /* | |
438 | * Write the value associated with an attribute into the out-of-line buffer | |
439 | * that we have defined for it. | |
440 | */ | |
441 | int | |
59915981 DC |
442 | xfs_attr_rmtval_set( |
443 | struct xfs_da_args *args) | |
9d6fabc0 | 444 | { |
59915981 DC |
445 | struct xfs_inode *dp = args->dp; |
446 | struct xfs_mount *mp = dp->i_mount; | |
447 | struct xfs_bmbt_irec map; | |
59915981 DC |
448 | xfs_dablk_t lblkno; |
449 | xfs_fileoff_t lfileoff = 0; | |
4a492e72 | 450 | uint8_t *src = args->value; |
59915981 DC |
451 | int blkcnt; |
452 | int valuelen; | |
453 | int nmap; | |
454 | int error; | |
59915981 | 455 | int offset = 0; |
9d6fabc0 DC |
456 | |
457 | trace_xfs_attr_rmtval_set(args); | |
458 | ||
9d6fabc0 DC |
459 | /* |
460 | * Find a "hole" in the attribute address space large enough for | |
59915981 DC |
461 | * us to drop the new attribute's value into. Because CRC enable |
462 | * attributes have headers, we can't just do a straight byte to FSB | |
f08bc2a9 | 463 | * conversion and have to take the header space into account. |
9d6fabc0 | 464 | */ |
ff105f75 | 465 | blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen); |
9d6fabc0 DC |
466 | error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, |
467 | XFS_ATTR_FORK); | |
59915981 DC |
468 | if (error) |
469 | return error; | |
470 | ||
9d6fabc0 DC |
471 | args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff; |
472 | args->rmtblkcnt = blkcnt; | |
473 | ||
474 | /* | |
475 | * Roll through the "value", allocating blocks on disk as required. | |
476 | */ | |
477 | while (blkcnt > 0) { | |
478 | /* | |
479 | * Allocate a single extent, up to the size of the value. | |
92a57a69 DC |
480 | * |
481 | * Note that we have to consider this a data allocation as we | |
482 | * write the remote attribute without logging the contents. | |
483 | * Hence we must ensure that we aren't using blocks that are on | |
484 | * the busy list so that we don't overwrite blocks which have | |
485 | * recently been freed but their transactions are not yet | |
486 | * committed to disk. If we overwrite the contents of a busy | |
487 | * extent and then crash then the block may not contain the | |
488 | * correct metadata after log recovery occurs. | |
9d6fabc0 | 489 | */ |
f33cea1a | 490 | xfs_defer_init(args->dfops, args->firstblock); |
9d6fabc0 DC |
491 | nmap = 1; |
492 | error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno, | |
92a57a69 | 493 | blkcnt, XFS_BMAPI_ATTRFORK, args->firstblock, |
f33cea1a | 494 | args->total, &map, &nmap, args->dfops); |
5c33baee CH |
495 | if (error) |
496 | goto out_defer_cancel; | |
497 | xfs_defer_ijoin(args->dfops, dp); | |
498 | error = xfs_defer_finish(&args->trans, args->dfops); | |
499 | if (error) | |
500 | goto out_defer_cancel; | |
9d6fabc0 | 501 | |
9d6fabc0 DC |
502 | ASSERT(nmap == 1); |
503 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
504 | (map.br_startblock != HOLESTARTBLOCK)); | |
505 | lblkno += map.br_blockcount; | |
506 | blkcnt -= map.br_blockcount; | |
507 | ||
508 | /* | |
509 | * Start the next trans in the chain. | |
510 | */ | |
d67406c9 | 511 | error = xfs_trans_roll_inode(&args->trans, dp); |
9d6fabc0 | 512 | if (error) |
af43ca9f | 513 | return error; |
9d6fabc0 DC |
514 | } |
515 | ||
516 | /* | |
517 | * Roll through the "value", copying the attribute value to the | |
518 | * already-allocated blocks. Blocks are written synchronously | |
519 | * so that we can know they are all on disk before we turn off | |
520 | * the INCOMPLETE flag. | |
521 | */ | |
522 | lblkno = args->rmtblkno; | |
4da23ca6 | 523 | blkcnt = args->rmtblkcnt; |
ff105f75 | 524 | valuelen = args->rmtvaluelen; |
9d6fabc0 | 525 | while (valuelen > 0) { |
f08bc2a9 DC |
526 | struct xfs_buf *bp; |
527 | xfs_daddr_t dblkno; | |
528 | int dblkcnt; | |
529 | ||
530 | ASSERT(blkcnt > 0); | |
9d6fabc0 | 531 | |
f33cea1a | 532 | xfs_defer_init(args->dfops, args->firstblock); |
9d6fabc0 DC |
533 | nmap = 1; |
534 | error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno, | |
4da23ca6 | 535 | blkcnt, &map, &nmap, |
9d6fabc0 DC |
536 | XFS_BMAPI_ATTRFORK); |
537 | if (error) | |
af43ca9f | 538 | return error; |
9d6fabc0 DC |
539 | ASSERT(nmap == 1); |
540 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
541 | (map.br_startblock != HOLESTARTBLOCK)); | |
542 | ||
543 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), | |
4da23ca6 | 544 | dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
9d6fabc0 | 545 | |
4da23ca6 | 546 | bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0); |
9d6fabc0 | 547 | if (!bp) |
12b53197 | 548 | return -ENOMEM; |
59915981 DC |
549 | bp->b_ops = &xfs_attr3_rmt_buf_ops; |
550 | ||
f08bc2a9 DC |
551 | xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset, |
552 | &valuelen, &src); | |
9d6fabc0 DC |
553 | |
554 | error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ | |
555 | xfs_buf_relse(bp); | |
556 | if (error) | |
557 | return error; | |
59915981 | 558 | |
9d6fabc0 | 559 | |
f08bc2a9 | 560 | /* roll attribute extent map forwards */ |
9d6fabc0 | 561 | lblkno += map.br_blockcount; |
4da23ca6 | 562 | blkcnt -= map.br_blockcount; |
9d6fabc0 DC |
563 | } |
564 | ASSERT(valuelen == 0); | |
59915981 | 565 | return 0; |
5c33baee CH |
566 | out_defer_cancel: |
567 | xfs_defer_cancel(args->dfops); | |
568 | args->trans = NULL; | |
569 | return error; | |
9d6fabc0 DC |
570 | } |
571 | ||
572 | /* | |
573 | * Remove the value associated with an attribute by deleting the | |
574 | * out-of-line buffer that it is stored on. | |
575 | */ | |
576 | int | |
f08bc2a9 DC |
577 | xfs_attr_rmtval_remove( |
578 | struct xfs_da_args *args) | |
9d6fabc0 | 579 | { |
f08bc2a9 DC |
580 | struct xfs_mount *mp = args->dp->i_mount; |
581 | xfs_dablk_t lblkno; | |
582 | int blkcnt; | |
583 | int error; | |
584 | int done; | |
9d6fabc0 DC |
585 | |
586 | trace_xfs_attr_rmtval_remove(args); | |
587 | ||
9d6fabc0 | 588 | /* |
526f9be5 | 589 | * Roll through the "value", invalidating the attribute value's blocks. |
9d6fabc0 DC |
590 | */ |
591 | lblkno = args->rmtblkno; | |
f08bc2a9 DC |
592 | blkcnt = args->rmtblkcnt; |
593 | while (blkcnt > 0) { | |
594 | struct xfs_bmbt_irec map; | |
595 | struct xfs_buf *bp; | |
596 | xfs_daddr_t dblkno; | |
597 | int dblkcnt; | |
598 | int nmap; | |
526f9be5 | 599 | |
9d6fabc0 DC |
600 | /* |
601 | * Try to remember where we decided to put the value. | |
602 | */ | |
603 | nmap = 1; | |
604 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
526f9be5 | 605 | blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); |
9d6fabc0 | 606 | if (error) |
af43ca9f | 607 | return error; |
9d6fabc0 DC |
608 | ASSERT(nmap == 1); |
609 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
610 | (map.br_startblock != HOLESTARTBLOCK)); | |
611 | ||
612 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), | |
526f9be5 | 613 | dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
9d6fabc0 DC |
614 | |
615 | /* | |
616 | * If the "remote" value is in the cache, remove it. | |
617 | */ | |
526f9be5 | 618 | bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK); |
9d6fabc0 DC |
619 | if (bp) { |
620 | xfs_buf_stale(bp); | |
621 | xfs_buf_relse(bp); | |
622 | bp = NULL; | |
623 | } | |
624 | ||
9d6fabc0 | 625 | lblkno += map.br_blockcount; |
526f9be5 | 626 | blkcnt -= map.br_blockcount; |
9d6fabc0 DC |
627 | } |
628 | ||
629 | /* | |
630 | * Keep de-allocating extents until the remote-value region is gone. | |
631 | */ | |
632 | lblkno = args->rmtblkno; | |
f08bc2a9 | 633 | blkcnt = args->rmtblkcnt; |
9d6fabc0 DC |
634 | done = 0; |
635 | while (!done) { | |
f33cea1a | 636 | xfs_defer_init(args->dfops, args->firstblock); |
9d6fabc0 | 637 | error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, |
db9cba4e | 638 | XFS_BMAPI_ATTRFORK, 1, args->firstblock, |
f33cea1a | 639 | args->dfops, &done); |
5c33baee CH |
640 | if (error) |
641 | goto out_defer_cancel; | |
642 | xfs_defer_ijoin(args->dfops, args->dp); | |
643 | error = xfs_defer_finish(&args->trans, args->dfops); | |
644 | if (error) | |
645 | goto out_defer_cancel; | |
9d6fabc0 | 646 | |
9d6fabc0 DC |
647 | /* |
648 | * Close out trans and start the next one in the chain. | |
649 | */ | |
d67406c9 | 650 | error = xfs_trans_roll_inode(&args->trans, args->dp); |
9d6fabc0 | 651 | if (error) |
af43ca9f | 652 | return error; |
9d6fabc0 | 653 | } |
af43ca9f | 654 | return 0; |
5c33baee CH |
655 | out_defer_cancel: |
656 | xfs_defer_cancel(args->dfops); | |
657 | args->trans = NULL; | |
658 | return error; | |
9d6fabc0 | 659 | } |