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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
95920cd6 DC |
2 | /* |
3 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. | |
d2e448d5 | 4 | * Copyright (c) 2013 Red Hat, Inc. |
95920cd6 | 5 | * All Rights Reserved. |
95920cd6 DC |
6 | */ |
7 | #include "xfs.h" | |
8 | #include "xfs_fs.h" | |
632b89e8 | 9 | #include "xfs_shared.h" |
a4fbe6ab | 10 | #include "xfs_format.h" |
239880ef DC |
11 | #include "xfs_log_format.h" |
12 | #include "xfs_trans_resv.h" | |
95920cd6 | 13 | #include "xfs_bit.h" |
95920cd6 | 14 | #include "xfs_mount.h" |
3ab78df2 | 15 | #include "xfs_defer.h" |
57062787 | 16 | #include "xfs_da_format.h" |
95920cd6 | 17 | #include "xfs_da_btree.h" |
95920cd6 DC |
18 | #include "xfs_inode.h" |
19 | #include "xfs_alloc.h" | |
239880ef | 20 | #include "xfs_trans.h" |
95920cd6 DC |
21 | #include "xfs_inode_item.h" |
22 | #include "xfs_bmap.h" | |
68988114 | 23 | #include "xfs_bmap_util.h" |
95920cd6 DC |
24 | #include "xfs_attr.h" |
25 | #include "xfs_attr_leaf.h" | |
26 | #include "xfs_attr_remote.h" | |
27 | #include "xfs_trans_space.h" | |
28 | #include "xfs_trace.h" | |
d2e448d5 DC |
29 | #include "xfs_cksum.h" |
30 | #include "xfs_buf_item.h" | |
a4fbe6ab | 31 | #include "xfs_error.h" |
95920cd6 DC |
32 | |
33 | #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ | |
34 | ||
d2e448d5 DC |
35 | /* |
36 | * Each contiguous block has a header, so it is not just a simple attribute | |
37 | * length to FSB conversion. | |
38 | */ | |
7bc0dc27 | 39 | int |
d2e448d5 DC |
40 | xfs_attr3_rmt_blocks( |
41 | struct xfs_mount *mp, | |
42 | int attrlen) | |
43 | { | |
551b382f DC |
44 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
45 | int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize); | |
46 | return (attrlen + buflen - 1) / buflen; | |
47 | } | |
48 | return XFS_B_TO_FSB(mp, attrlen); | |
d2e448d5 DC |
49 | } |
50 | ||
7bc0dc27 DC |
51 | /* |
52 | * Checking of the remote attribute header is split into two parts. The verifier | |
53 | * does CRC, location and bounds checking, the unpacking function checks the | |
54 | * attribute parameters and owner. | |
55 | */ | |
a6a781a5 | 56 | static xfs_failaddr_t |
7bc0dc27 | 57 | xfs_attr3_rmt_hdr_ok( |
7bc0dc27 DC |
58 | void *ptr, |
59 | xfs_ino_t ino, | |
60 | uint32_t offset, | |
61 | uint32_t size, | |
62 | xfs_daddr_t bno) | |
63 | { | |
64 | struct xfs_attr3_rmt_hdr *rmt = ptr; | |
65 | ||
66 | if (bno != be64_to_cpu(rmt->rm_blkno)) | |
a6a781a5 | 67 | return __this_address; |
7bc0dc27 | 68 | if (offset != be32_to_cpu(rmt->rm_offset)) |
a6a781a5 | 69 | return __this_address; |
7bc0dc27 | 70 | if (size != be32_to_cpu(rmt->rm_bytes)) |
a6a781a5 | 71 | return __this_address; |
7bc0dc27 | 72 | if (ino != be64_to_cpu(rmt->rm_owner)) |
a6a781a5 | 73 | return __this_address; |
7bc0dc27 DC |
74 | |
75 | /* ok */ | |
a6a781a5 | 76 | return NULL; |
7bc0dc27 DC |
77 | } |
78 | ||
a6a781a5 | 79 | static xfs_failaddr_t |
d2e448d5 | 80 | xfs_attr3_rmt_verify( |
7bc0dc27 DC |
81 | struct xfs_mount *mp, |
82 | void *ptr, | |
83 | int fsbsize, | |
84 | xfs_daddr_t bno) | |
d2e448d5 | 85 | { |
7bc0dc27 | 86 | struct xfs_attr3_rmt_hdr *rmt = ptr; |
d2e448d5 DC |
87 | |
88 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
a6a781a5 | 89 | return __this_address; |
d2e448d5 | 90 | if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC)) |
a6a781a5 | 91 | return __this_address; |
ce748eaa | 92 | if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid)) |
a6a781a5 | 93 | return __this_address; |
7bc0dc27 | 94 | if (be64_to_cpu(rmt->rm_blkno) != bno) |
a6a781a5 | 95 | return __this_address; |
7bc0dc27 | 96 | if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt)) |
a6a781a5 | 97 | return __this_address; |
d2e448d5 | 98 | if (be32_to_cpu(rmt->rm_offset) + |
51fcbfe7 | 99 | be32_to_cpu(rmt->rm_bytes) > XFS_XATTR_SIZE_MAX) |
a6a781a5 | 100 | return __this_address; |
d2e448d5 | 101 | if (rmt->rm_owner == 0) |
a6a781a5 | 102 | return __this_address; |
d2e448d5 | 103 | |
a6a781a5 | 104 | return NULL; |
d2e448d5 DC |
105 | } |
106 | ||
b5572597 DW |
107 | static int |
108 | __xfs_attr3_rmt_read_verify( | |
109 | struct xfs_buf *bp, | |
110 | bool check_crc, | |
111 | xfs_failaddr_t *failaddr) | |
d2e448d5 DC |
112 | { |
113 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
7bc0dc27 DC |
114 | char *ptr; |
115 | int len; | |
7bc0dc27 | 116 | xfs_daddr_t bno; |
c2c4c477 | 117 | int blksize = mp->m_attr_geo->blksize; |
d2e448d5 DC |
118 | |
119 | /* no verification of non-crc buffers */ | |
120 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
b5572597 | 121 | return 0; |
d2e448d5 | 122 | |
7bc0dc27 DC |
123 | ptr = bp->b_addr; |
124 | bno = bp->b_bn; | |
125 | len = BBTOB(bp->b_length); | |
c2c4c477 | 126 | ASSERT(len >= blksize); |
7bc0dc27 DC |
127 | |
128 | while (len > 0) { | |
b5572597 DW |
129 | if (check_crc && |
130 | !xfs_verify_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF)) { | |
131 | *failaddr = __this_address; | |
132 | return -EFSBADCRC; | |
7bc0dc27 | 133 | } |
b5572597 DW |
134 | *failaddr = xfs_attr3_rmt_verify(mp, ptr, blksize, bno); |
135 | if (*failaddr) | |
136 | return -EFSCORRUPTED; | |
c2c4c477 DC |
137 | len -= blksize; |
138 | ptr += blksize; | |
139 | bno += BTOBB(blksize); | |
7bc0dc27 DC |
140 | } |
141 | ||
b5572597 DW |
142 | if (len != 0) { |
143 | *failaddr = __this_address; | |
144 | return -EFSCORRUPTED; | |
145 | } | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | static void | |
151 | xfs_attr3_rmt_read_verify( | |
152 | struct xfs_buf *bp) | |
153 | { | |
154 | xfs_failaddr_t fa; | |
155 | int error; | |
156 | ||
157 | error = __xfs_attr3_rmt_read_verify(bp, true, &fa); | |
158 | if (error) | |
159 | xfs_verifier_error(bp, error, fa); | |
160 | } | |
161 | ||
162 | static xfs_failaddr_t | |
163 | xfs_attr3_rmt_verify_struct( | |
164 | struct xfs_buf *bp) | |
165 | { | |
166 | xfs_failaddr_t fa; | |
167 | int error; | |
168 | ||
169 | error = __xfs_attr3_rmt_read_verify(bp, false, &fa); | |
170 | return error ? fa : NULL; | |
d2e448d5 DC |
171 | } |
172 | ||
173 | static void | |
174 | xfs_attr3_rmt_write_verify( | |
175 | struct xfs_buf *bp) | |
176 | { | |
177 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
bc1a09b8 | 178 | xfs_failaddr_t fa; |
e3c32ee9 | 179 | int blksize = mp->m_attr_geo->blksize; |
7bc0dc27 DC |
180 | char *ptr; |
181 | int len; | |
182 | xfs_daddr_t bno; | |
d2e448d5 DC |
183 | |
184 | /* no verification of non-crc buffers */ | |
185 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
186 | return; | |
187 | ||
7bc0dc27 DC |
188 | ptr = bp->b_addr; |
189 | bno = bp->b_bn; | |
190 | len = BBTOB(bp->b_length); | |
c2c4c477 | 191 | ASSERT(len >= blksize); |
7bc0dc27 DC |
192 | |
193 | while (len > 0) { | |
e3c32ee9 DC |
194 | struct xfs_attr3_rmt_hdr *rmt = (struct xfs_attr3_rmt_hdr *)ptr; |
195 | ||
bc1a09b8 DW |
196 | fa = xfs_attr3_rmt_verify(mp, ptr, blksize, bno); |
197 | if (fa) { | |
198 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
7bc0dc27 DC |
199 | return; |
200 | } | |
d2e448d5 | 201 | |
e3c32ee9 DC |
202 | /* |
203 | * Ensure we aren't writing bogus LSNs to disk. See | |
204 | * xfs_attr3_rmt_hdr_set() for the explanation. | |
205 | */ | |
206 | if (rmt->rm_lsn != cpu_to_be64(NULLCOMMITLSN)) { | |
bc1a09b8 | 207 | xfs_verifier_error(bp, -EFSCORRUPTED, __this_address); |
e3c32ee9 | 208 | return; |
7bc0dc27 | 209 | } |
c2c4c477 | 210 | xfs_update_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF); |
7bc0dc27 | 211 | |
c2c4c477 DC |
212 | len -= blksize; |
213 | ptr += blksize; | |
214 | bno += BTOBB(blksize); | |
d2e448d5 | 215 | } |
31ca03c9 DW |
216 | |
217 | if (len != 0) | |
bc1a09b8 | 218 | xfs_verifier_error(bp, -EFSCORRUPTED, __this_address); |
d2e448d5 DC |
219 | } |
220 | ||
221 | const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = { | |
233135b7 | 222 | .name = "xfs_attr3_rmt", |
d2e448d5 DC |
223 | .verify_read = xfs_attr3_rmt_read_verify, |
224 | .verify_write = xfs_attr3_rmt_write_verify, | |
b5572597 | 225 | .verify_struct = xfs_attr3_rmt_verify_struct, |
d2e448d5 DC |
226 | }; |
227 | ||
7bc0dc27 | 228 | STATIC int |
d2e448d5 DC |
229 | xfs_attr3_rmt_hdr_set( |
230 | struct xfs_mount *mp, | |
7bc0dc27 | 231 | void *ptr, |
d2e448d5 DC |
232 | xfs_ino_t ino, |
233 | uint32_t offset, | |
234 | uint32_t size, | |
7bc0dc27 | 235 | xfs_daddr_t bno) |
d2e448d5 | 236 | { |
7bc0dc27 | 237 | struct xfs_attr3_rmt_hdr *rmt = ptr; |
d2e448d5 DC |
238 | |
239 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
240 | return 0; | |
241 | ||
242 | rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC); | |
243 | rmt->rm_offset = cpu_to_be32(offset); | |
244 | rmt->rm_bytes = cpu_to_be32(size); | |
ce748eaa | 245 | uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid); |
d2e448d5 | 246 | rmt->rm_owner = cpu_to_be64(ino); |
7bc0dc27 | 247 | rmt->rm_blkno = cpu_to_be64(bno); |
d2e448d5 | 248 | |
e3c32ee9 DC |
249 | /* |
250 | * Remote attribute blocks are written synchronously, so we don't | |
251 | * have an LSN that we can stamp in them that makes any sense to log | |
252 | * recovery. To ensure that log recovery handles overwrites of these | |
253 | * blocks sanely (i.e. once they've been freed and reallocated as some | |
254 | * other type of metadata) we need to ensure that the LSN has a value | |
255 | * that tells log recovery to ignore the LSN and overwrite the buffer | |
256 | * with whatever is in it's log. To do this, we use the magic | |
257 | * NULLCOMMITLSN to indicate that the LSN is invalid. | |
258 | */ | |
259 | rmt->rm_lsn = cpu_to_be64(NULLCOMMITLSN); | |
260 | ||
d2e448d5 DC |
261 | return sizeof(struct xfs_attr3_rmt_hdr); |
262 | } | |
263 | ||
264 | /* | |
7bc0dc27 | 265 | * Helper functions to copy attribute data in and out of the one disk extents |
d2e448d5 | 266 | */ |
7bc0dc27 DC |
267 | STATIC int |
268 | xfs_attr_rmtval_copyout( | |
269 | struct xfs_mount *mp, | |
270 | struct xfs_buf *bp, | |
271 | xfs_ino_t ino, | |
272 | int *offset, | |
273 | int *valuelen, | |
c8ce540d | 274 | uint8_t **dst) |
d2e448d5 | 275 | { |
7bc0dc27 DC |
276 | char *src = bp->b_addr; |
277 | xfs_daddr_t bno = bp->b_bn; | |
278 | int len = BBTOB(bp->b_length); | |
c2c4c477 | 279 | int blksize = mp->m_attr_geo->blksize; |
d2e448d5 | 280 | |
c2c4c477 | 281 | ASSERT(len >= blksize); |
d2e448d5 | 282 | |
7bc0dc27 DC |
283 | while (len > 0 && *valuelen > 0) { |
284 | int hdr_size = 0; | |
c2c4c477 | 285 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); |
7bc0dc27 | 286 | |
c5c249b4 | 287 | byte_cnt = min(*valuelen, byte_cnt); |
7bc0dc27 DC |
288 | |
289 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
a6a781a5 | 290 | if (xfs_attr3_rmt_hdr_ok(src, ino, *offset, |
7bc0dc27 DC |
291 | byte_cnt, bno)) { |
292 | xfs_alert(mp, | |
293 | "remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)", | |
294 | bno, *offset, byte_cnt, ino); | |
2451337d | 295 | return -EFSCORRUPTED; |
7bc0dc27 DC |
296 | } |
297 | hdr_size = sizeof(struct xfs_attr3_rmt_hdr); | |
298 | } | |
299 | ||
300 | memcpy(*dst, src + hdr_size, byte_cnt); | |
301 | ||
302 | /* roll buffer forwards */ | |
c2c4c477 DC |
303 | len -= blksize; |
304 | src += blksize; | |
305 | bno += BTOBB(blksize); | |
7bc0dc27 DC |
306 | |
307 | /* roll attribute data forwards */ | |
308 | *valuelen -= byte_cnt; | |
309 | *dst += byte_cnt; | |
310 | *offset += byte_cnt; | |
311 | } | |
312 | return 0; | |
313 | } | |
314 | ||
315 | STATIC void | |
316 | xfs_attr_rmtval_copyin( | |
317 | struct xfs_mount *mp, | |
318 | struct xfs_buf *bp, | |
319 | xfs_ino_t ino, | |
320 | int *offset, | |
321 | int *valuelen, | |
c8ce540d | 322 | uint8_t **src) |
7bc0dc27 DC |
323 | { |
324 | char *dst = bp->b_addr; | |
325 | xfs_daddr_t bno = bp->b_bn; | |
326 | int len = BBTOB(bp->b_length); | |
c2c4c477 | 327 | int blksize = mp->m_attr_geo->blksize; |
7bc0dc27 | 328 | |
c2c4c477 | 329 | ASSERT(len >= blksize); |
7bc0dc27 DC |
330 | |
331 | while (len > 0 && *valuelen > 0) { | |
332 | int hdr_size; | |
c2c4c477 | 333 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); |
7bc0dc27 DC |
334 | |
335 | byte_cnt = min(*valuelen, byte_cnt); | |
336 | hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset, | |
337 | byte_cnt, bno); | |
338 | ||
339 | memcpy(dst + hdr_size, *src, byte_cnt); | |
340 | ||
341 | /* | |
342 | * If this is the last block, zero the remainder of it. | |
343 | * Check that we are actually the last block, too. | |
344 | */ | |
c2c4c477 | 345 | if (byte_cnt + hdr_size < blksize) { |
7bc0dc27 | 346 | ASSERT(*valuelen - byte_cnt == 0); |
c2c4c477 | 347 | ASSERT(len == blksize); |
7bc0dc27 | 348 | memset(dst + hdr_size + byte_cnt, 0, |
c2c4c477 | 349 | blksize - hdr_size - byte_cnt); |
7bc0dc27 DC |
350 | } |
351 | ||
352 | /* roll buffer forwards */ | |
c2c4c477 DC |
353 | len -= blksize; |
354 | dst += blksize; | |
355 | bno += BTOBB(blksize); | |
7bc0dc27 DC |
356 | |
357 | /* roll attribute data forwards */ | |
358 | *valuelen -= byte_cnt; | |
359 | *src += byte_cnt; | |
360 | *offset += byte_cnt; | |
361 | } | |
d2e448d5 DC |
362 | } |
363 | ||
95920cd6 DC |
364 | /* |
365 | * Read the value associated with an attribute from the out-of-line buffer | |
366 | * that we stored it in. | |
367 | */ | |
368 | int | |
d2e448d5 DC |
369 | xfs_attr_rmtval_get( |
370 | struct xfs_da_args *args) | |
95920cd6 | 371 | { |
d2e448d5 DC |
372 | struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE]; |
373 | struct xfs_mount *mp = args->dp->i_mount; | |
374 | struct xfs_buf *bp; | |
d2e448d5 | 375 | xfs_dablk_t lblkno = args->rmtblkno; |
c8ce540d | 376 | uint8_t *dst = args->value; |
8275cdd0 | 377 | int valuelen; |
d2e448d5 DC |
378 | int nmap; |
379 | int error; | |
7bc0dc27 | 380 | int blkcnt = args->rmtblkcnt; |
d2e448d5 DC |
381 | int i; |
382 | int offset = 0; | |
95920cd6 DC |
383 | |
384 | trace_xfs_attr_rmtval_get(args); | |
385 | ||
386 | ASSERT(!(args->flags & ATTR_KERNOVAL)); | |
8275cdd0 | 387 | ASSERT(args->rmtvaluelen == args->valuelen); |
95920cd6 | 388 | |
8275cdd0 | 389 | valuelen = args->rmtvaluelen; |
95920cd6 DC |
390 | while (valuelen > 0) { |
391 | nmap = ATTR_RMTVALUE_MAPSIZE; | |
392 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
551b382f | 393 | blkcnt, map, &nmap, |
95920cd6 DC |
394 | XFS_BMAPI_ATTRFORK); |
395 | if (error) | |
d2e448d5 | 396 | return error; |
95920cd6 DC |
397 | ASSERT(nmap >= 1); |
398 | ||
399 | for (i = 0; (i < nmap) && (valuelen > 0); i++) { | |
7bc0dc27 DC |
400 | xfs_daddr_t dblkno; |
401 | int dblkcnt; | |
d2e448d5 | 402 | |
95920cd6 DC |
403 | ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && |
404 | (map[i].br_startblock != HOLESTARTBLOCK)); | |
405 | dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); | |
7bc0dc27 | 406 | dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); |
ad017f65 DW |
407 | error = xfs_trans_read_buf(mp, args->trans, |
408 | mp->m_ddev_targp, | |
7bc0dc27 | 409 | dblkno, dblkcnt, 0, &bp, |
d2e448d5 | 410 | &xfs_attr3_rmt_buf_ops); |
95920cd6 | 411 | if (error) |
d2e448d5 DC |
412 | return error; |
413 | ||
7bc0dc27 DC |
414 | error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino, |
415 | &offset, &valuelen, | |
416 | &dst); | |
ad017f65 | 417 | xfs_trans_brelse(args->trans, bp); |
7bc0dc27 DC |
418 | if (error) |
419 | return error; | |
d2e448d5 | 420 | |
7bc0dc27 | 421 | /* roll attribute extent map forwards */ |
95920cd6 | 422 | lblkno += map[i].br_blockcount; |
7bc0dc27 | 423 | blkcnt -= map[i].br_blockcount; |
95920cd6 DC |
424 | } |
425 | } | |
426 | ASSERT(valuelen == 0); | |
d2e448d5 | 427 | return 0; |
95920cd6 DC |
428 | } |
429 | ||
430 | /* | |
431 | * Write the value associated with an attribute into the out-of-line buffer | |
432 | * that we have defined for it. | |
433 | */ | |
434 | int | |
d2e448d5 DC |
435 | xfs_attr_rmtval_set( |
436 | struct xfs_da_args *args) | |
95920cd6 | 437 | { |
d2e448d5 DC |
438 | struct xfs_inode *dp = args->dp; |
439 | struct xfs_mount *mp = dp->i_mount; | |
440 | struct xfs_bmbt_irec map; | |
d2e448d5 DC |
441 | xfs_dablk_t lblkno; |
442 | xfs_fileoff_t lfileoff = 0; | |
c8ce540d | 443 | uint8_t *src = args->value; |
d2e448d5 DC |
444 | int blkcnt; |
445 | int valuelen; | |
446 | int nmap; | |
447 | int error; | |
d2e448d5 | 448 | int offset = 0; |
95920cd6 DC |
449 | |
450 | trace_xfs_attr_rmtval_set(args); | |
451 | ||
95920cd6 DC |
452 | /* |
453 | * Find a "hole" in the attribute address space large enough for | |
d2e448d5 DC |
454 | * us to drop the new attribute's value into. Because CRC enable |
455 | * attributes have headers, we can't just do a straight byte to FSB | |
7bc0dc27 | 456 | * conversion and have to take the header space into account. |
95920cd6 | 457 | */ |
8275cdd0 | 458 | blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen); |
95920cd6 DC |
459 | error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, |
460 | XFS_ATTR_FORK); | |
d2e448d5 DC |
461 | if (error) |
462 | return error; | |
463 | ||
95920cd6 DC |
464 | args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff; |
465 | args->rmtblkcnt = blkcnt; | |
466 | ||
467 | /* | |
468 | * Roll through the "value", allocating blocks on disk as required. | |
469 | */ | |
470 | while (blkcnt > 0) { | |
471 | /* | |
472 | * Allocate a single extent, up to the size of the value. | |
df150ed1 DC |
473 | * |
474 | * Note that we have to consider this a data allocation as we | |
475 | * write the remote attribute without logging the contents. | |
476 | * Hence we must ensure that we aren't using blocks that are on | |
477 | * the busy list so that we don't overwrite blocks which have | |
478 | * recently been freed but their transactions are not yet | |
479 | * committed to disk. If we overwrite the contents of a busy | |
480 | * extent and then crash then the block may not contain the | |
481 | * correct metadata after log recovery occurs. | |
95920cd6 | 482 | */ |
2c3234d1 | 483 | xfs_defer_init(args->dfops, args->firstblock); |
95920cd6 DC |
484 | nmap = 1; |
485 | error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno, | |
df150ed1 | 486 | blkcnt, XFS_BMAPI_ATTRFORK, args->firstblock, |
2c3234d1 | 487 | args->total, &map, &nmap, args->dfops); |
8ad7c629 CH |
488 | if (error) |
489 | goto out_defer_cancel; | |
490 | xfs_defer_ijoin(args->dfops, dp); | |
491 | error = xfs_defer_finish(&args->trans, args->dfops); | |
492 | if (error) | |
493 | goto out_defer_cancel; | |
95920cd6 | 494 | |
95920cd6 DC |
495 | ASSERT(nmap == 1); |
496 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
497 | (map.br_startblock != HOLESTARTBLOCK)); | |
498 | lblkno += map.br_blockcount; | |
499 | blkcnt -= map.br_blockcount; | |
500 | ||
501 | /* | |
502 | * Start the next trans in the chain. | |
503 | */ | |
411350df | 504 | error = xfs_trans_roll_inode(&args->trans, dp); |
95920cd6 | 505 | if (error) |
d99831ff | 506 | return error; |
95920cd6 DC |
507 | } |
508 | ||
509 | /* | |
510 | * Roll through the "value", copying the attribute value to the | |
511 | * already-allocated blocks. Blocks are written synchronously | |
512 | * so that we can know they are all on disk before we turn off | |
513 | * the INCOMPLETE flag. | |
514 | */ | |
515 | lblkno = args->rmtblkno; | |
26f71445 | 516 | blkcnt = args->rmtblkcnt; |
8275cdd0 | 517 | valuelen = args->rmtvaluelen; |
95920cd6 | 518 | while (valuelen > 0) { |
7bc0dc27 DC |
519 | struct xfs_buf *bp; |
520 | xfs_daddr_t dblkno; | |
521 | int dblkcnt; | |
522 | ||
523 | ASSERT(blkcnt > 0); | |
95920cd6 | 524 | |
2c3234d1 | 525 | xfs_defer_init(args->dfops, args->firstblock); |
95920cd6 DC |
526 | nmap = 1; |
527 | error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno, | |
26f71445 | 528 | blkcnt, &map, &nmap, |
95920cd6 DC |
529 | XFS_BMAPI_ATTRFORK); |
530 | if (error) | |
d99831ff | 531 | return error; |
95920cd6 DC |
532 | ASSERT(nmap == 1); |
533 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
534 | (map.br_startblock != HOLESTARTBLOCK)); | |
535 | ||
536 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), | |
26f71445 | 537 | dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
95920cd6 | 538 | |
26f71445 | 539 | bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0); |
95920cd6 | 540 | if (!bp) |
2451337d | 541 | return -ENOMEM; |
d2e448d5 | 542 | bp->b_ops = &xfs_attr3_rmt_buf_ops; |
26f71445 | 543 | |
7bc0dc27 DC |
544 | xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset, |
545 | &valuelen, &src); | |
95920cd6 DC |
546 | |
547 | error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ | |
548 | xfs_buf_relse(bp); | |
549 | if (error) | |
550 | return error; | |
d2e448d5 | 551 | |
95920cd6 | 552 | |
7bc0dc27 | 553 | /* roll attribute extent map forwards */ |
95920cd6 | 554 | lblkno += map.br_blockcount; |
26f71445 | 555 | blkcnt -= map.br_blockcount; |
95920cd6 DC |
556 | } |
557 | ASSERT(valuelen == 0); | |
d2e448d5 | 558 | return 0; |
8ad7c629 CH |
559 | out_defer_cancel: |
560 | xfs_defer_cancel(args->dfops); | |
561 | args->trans = NULL; | |
562 | return error; | |
95920cd6 DC |
563 | } |
564 | ||
565 | /* | |
566 | * Remove the value associated with an attribute by deleting the | |
567 | * out-of-line buffer that it is stored on. | |
568 | */ | |
569 | int | |
7bc0dc27 DC |
570 | xfs_attr_rmtval_remove( |
571 | struct xfs_da_args *args) | |
95920cd6 | 572 | { |
7bc0dc27 DC |
573 | struct xfs_mount *mp = args->dp->i_mount; |
574 | xfs_dablk_t lblkno; | |
575 | int blkcnt; | |
576 | int error; | |
577 | int done; | |
95920cd6 DC |
578 | |
579 | trace_xfs_attr_rmtval_remove(args); | |
580 | ||
95920cd6 | 581 | /* |
58a72281 | 582 | * Roll through the "value", invalidating the attribute value's blocks. |
95920cd6 DC |
583 | */ |
584 | lblkno = args->rmtblkno; | |
7bc0dc27 DC |
585 | blkcnt = args->rmtblkcnt; |
586 | while (blkcnt > 0) { | |
587 | struct xfs_bmbt_irec map; | |
588 | struct xfs_buf *bp; | |
589 | xfs_daddr_t dblkno; | |
590 | int dblkcnt; | |
591 | int nmap; | |
58a72281 | 592 | |
95920cd6 DC |
593 | /* |
594 | * Try to remember where we decided to put the value. | |
595 | */ | |
596 | nmap = 1; | |
597 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
58a72281 | 598 | blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); |
95920cd6 | 599 | if (error) |
d99831ff | 600 | return error; |
95920cd6 DC |
601 | ASSERT(nmap == 1); |
602 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
603 | (map.br_startblock != HOLESTARTBLOCK)); | |
604 | ||
605 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), | |
58a72281 | 606 | dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
95920cd6 DC |
607 | |
608 | /* | |
609 | * If the "remote" value is in the cache, remove it. | |
610 | */ | |
8925a3dc | 611 | bp = xfs_buf_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK); |
95920cd6 DC |
612 | if (bp) { |
613 | xfs_buf_stale(bp); | |
614 | xfs_buf_relse(bp); | |
615 | bp = NULL; | |
616 | } | |
617 | ||
95920cd6 | 618 | lblkno += map.br_blockcount; |
58a72281 | 619 | blkcnt -= map.br_blockcount; |
95920cd6 DC |
620 | } |
621 | ||
622 | /* | |
623 | * Keep de-allocating extents until the remote-value region is gone. | |
624 | */ | |
625 | lblkno = args->rmtblkno; | |
7bc0dc27 | 626 | blkcnt = args->rmtblkcnt; |
95920cd6 DC |
627 | done = 0; |
628 | while (!done) { | |
2c3234d1 | 629 | xfs_defer_init(args->dfops, args->firstblock); |
95920cd6 | 630 | error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, |
ab7bb610 | 631 | XFS_BMAPI_ATTRFORK, 1, args->firstblock, |
2c3234d1 | 632 | args->dfops, &done); |
8ad7c629 CH |
633 | if (error) |
634 | goto out_defer_cancel; | |
635 | xfs_defer_ijoin(args->dfops, args->dp); | |
636 | error = xfs_defer_finish(&args->trans, args->dfops); | |
637 | if (error) | |
638 | goto out_defer_cancel; | |
95920cd6 | 639 | |
95920cd6 DC |
640 | /* |
641 | * Close out trans and start the next one in the chain. | |
642 | */ | |
411350df | 643 | error = xfs_trans_roll_inode(&args->trans, args->dp); |
95920cd6 | 644 | if (error) |
d99831ff | 645 | return error; |
95920cd6 | 646 | } |
d99831ff | 647 | return 0; |
8ad7c629 CH |
648 | out_defer_cancel: |
649 | xfs_defer_cancel(args->dfops); | |
650 | args->trans = NULL; | |
651 | return error; | |
95920cd6 | 652 | } |