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37b3b4d6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9d6fabc0 DC |
2 | /* |
3 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. | |
59915981 | 4 | * Copyright (c) 2013 Red Hat, Inc. |
9d6fabc0 | 5 | * All Rights Reserved. |
9d6fabc0 | 6 | */ |
9c799827 | 7 | #include "libxfs_priv.h" |
b626fb59 DC |
8 | #include "xfs_fs.h" |
9 | #include "xfs_shared.h" | |
10 | #include "xfs_format.h" | |
11 | #include "xfs_log_format.h" | |
12 | #include "xfs_trans_resv.h" | |
13 | #include "xfs_bit.h" | |
14 | #include "xfs_mount.h" | |
f944d3d0 | 15 | #include "xfs_defer.h" |
b626fb59 DC |
16 | #include "xfs_da_format.h" |
17 | #include "xfs_da_btree.h" | |
18 | #include "xfs_inode.h" | |
b626fb59 DC |
19 | #include "xfs_trans.h" |
20 | #include "xfs_bmap.h" | |
43be641e DW |
21 | #include "xfs_attr.h" |
22 | #include "xfs_attr_remote.h" | |
b626fb59 | 23 | #include "xfs_trace.h" |
9d6fabc0 DC |
24 | |
25 | #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ | |
26 | ||
a8bbb628 DW |
27 | /* |
28 | * Remote Attribute Values | |
29 | * ======================= | |
30 | * | |
31 | * Remote extended attribute values are conceptually simple -- they're written | |
32 | * to data blocks mapped by an inode's attribute fork, and they have an upper | |
33 | * size limit of 64k. Setting a value does not involve the XFS log. | |
34 | * | |
35 | * However, on a v5 filesystem, maximally sized remote attr values require one | |
36 | * block more than 64k worth of space to hold both the remote attribute value | |
37 | * header (64 bytes). On a 4k block filesystem this results in a 68k buffer; | |
38 | * on a 64k block filesystem, this would be a 128k buffer. Note that the log | |
39 | * format can only handle a dirty buffer of XFS_MAX_BLOCKSIZE length (64k). | |
40 | * Therefore, we /must/ ensure that remote attribute value buffers never touch | |
41 | * the logging system and therefore never have a log item. | |
42 | */ | |
43 | ||
59915981 DC |
44 | /* |
45 | * Each contiguous block has a header, so it is not just a simple attribute | |
46 | * length to FSB conversion. | |
47 | */ | |
f08bc2a9 | 48 | int |
59915981 DC |
49 | xfs_attr3_rmt_blocks( |
50 | struct xfs_mount *mp, | |
51 | int attrlen) | |
52 | { | |
b16a427a | 53 | if (xfs_has_crc(mp)) { |
72e78b51 DC |
54 | int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize); |
55 | return (attrlen + buflen - 1) / buflen; | |
56 | } | |
57 | return XFS_B_TO_FSB(mp, attrlen); | |
59915981 DC |
58 | } |
59 | ||
f08bc2a9 DC |
60 | /* |
61 | * Checking of the remote attribute header is split into two parts. The verifier | |
62 | * does CRC, location and bounds checking, the unpacking function checks the | |
63 | * attribute parameters and owner. | |
64 | */ | |
bc01119d | 65 | static xfs_failaddr_t |
f08bc2a9 | 66 | xfs_attr3_rmt_hdr_ok( |
f08bc2a9 DC |
67 | void *ptr, |
68 | xfs_ino_t ino, | |
69 | uint32_t offset, | |
70 | uint32_t size, | |
71 | xfs_daddr_t bno) | |
72 | { | |
73 | struct xfs_attr3_rmt_hdr *rmt = ptr; | |
74 | ||
75 | if (bno != be64_to_cpu(rmt->rm_blkno)) | |
bc01119d | 76 | return __this_address; |
f08bc2a9 | 77 | if (offset != be32_to_cpu(rmt->rm_offset)) |
bc01119d | 78 | return __this_address; |
f08bc2a9 | 79 | if (size != be32_to_cpu(rmt->rm_bytes)) |
bc01119d | 80 | return __this_address; |
f08bc2a9 | 81 | if (ino != be64_to_cpu(rmt->rm_owner)) |
bc01119d | 82 | return __this_address; |
f08bc2a9 DC |
83 | |
84 | /* ok */ | |
bc01119d | 85 | return NULL; |
f08bc2a9 DC |
86 | } |
87 | ||
bc01119d | 88 | static xfs_failaddr_t |
59915981 | 89 | xfs_attr3_rmt_verify( |
f08bc2a9 | 90 | struct xfs_mount *mp, |
68dbe77f | 91 | struct xfs_buf *bp, |
f08bc2a9 DC |
92 | void *ptr, |
93 | int fsbsize, | |
94 | xfs_daddr_t bno) | |
59915981 | 95 | { |
f08bc2a9 | 96 | struct xfs_attr3_rmt_hdr *rmt = ptr; |
59915981 | 97 | |
68dbe77f | 98 | if (!xfs_verify_magic(bp, rmt->rm_magic)) |
bc01119d | 99 | return __this_address; |
9c4e12fb | 100 | if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid)) |
bc01119d | 101 | return __this_address; |
f08bc2a9 | 102 | if (be64_to_cpu(rmt->rm_blkno) != bno) |
bc01119d | 103 | return __this_address; |
f08bc2a9 | 104 | if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt)) |
bc01119d | 105 | return __this_address; |
59915981 | 106 | if (be32_to_cpu(rmt->rm_offset) + |
ec9d24e9 | 107 | be32_to_cpu(rmt->rm_bytes) > XFS_XATTR_SIZE_MAX) |
bc01119d | 108 | return __this_address; |
59915981 | 109 | if (rmt->rm_owner == 0) |
bc01119d | 110 | return __this_address; |
59915981 | 111 | |
bc01119d | 112 | return NULL; |
59915981 DC |
113 | } |
114 | ||
95d9582b DW |
115 | static int |
116 | __xfs_attr3_rmt_read_verify( | |
117 | struct xfs_buf *bp, | |
118 | bool check_crc, | |
119 | xfs_failaddr_t *failaddr) | |
59915981 | 120 | { |
7861ef77 | 121 | struct xfs_mount *mp = bp->b_mount; |
f08bc2a9 DC |
122 | char *ptr; |
123 | int len; | |
f08bc2a9 | 124 | xfs_daddr_t bno; |
ff105f75 | 125 | int blksize = mp->m_attr_geo->blksize; |
59915981 DC |
126 | |
127 | /* no verification of non-crc buffers */ | |
b16a427a | 128 | if (!xfs_has_crc(mp)) |
95d9582b | 129 | return 0; |
59915981 | 130 | |
f08bc2a9 | 131 | ptr = bp->b_addr; |
f1208396 | 132 | bno = xfs_buf_daddr(bp); |
f08bc2a9 | 133 | len = BBTOB(bp->b_length); |
ff105f75 | 134 | ASSERT(len >= blksize); |
f08bc2a9 DC |
135 | |
136 | while (len > 0) { | |
95d9582b DW |
137 | if (check_crc && |
138 | !xfs_verify_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF)) { | |
139 | *failaddr = __this_address; | |
140 | return -EFSBADCRC; | |
f08bc2a9 | 141 | } |
68dbe77f | 142 | *failaddr = xfs_attr3_rmt_verify(mp, bp, ptr, blksize, bno); |
95d9582b DW |
143 | if (*failaddr) |
144 | return -EFSCORRUPTED; | |
ff105f75 DC |
145 | len -= blksize; |
146 | ptr += blksize; | |
147 | bno += BTOBB(blksize); | |
f08bc2a9 DC |
148 | } |
149 | ||
95d9582b DW |
150 | if (len != 0) { |
151 | *failaddr = __this_address; | |
152 | return -EFSCORRUPTED; | |
153 | } | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static void | |
159 | xfs_attr3_rmt_read_verify( | |
160 | struct xfs_buf *bp) | |
161 | { | |
162 | xfs_failaddr_t fa; | |
163 | int error; | |
164 | ||
165 | error = __xfs_attr3_rmt_read_verify(bp, true, &fa); | |
166 | if (error) | |
167 | xfs_verifier_error(bp, error, fa); | |
168 | } | |
169 | ||
170 | static xfs_failaddr_t | |
171 | xfs_attr3_rmt_verify_struct( | |
172 | struct xfs_buf *bp) | |
173 | { | |
174 | xfs_failaddr_t fa; | |
175 | int error; | |
176 | ||
177 | error = __xfs_attr3_rmt_read_verify(bp, false, &fa); | |
178 | return error ? fa : NULL; | |
59915981 DC |
179 | } |
180 | ||
181 | static void | |
182 | xfs_attr3_rmt_write_verify( | |
183 | struct xfs_buf *bp) | |
184 | { | |
7861ef77 | 185 | struct xfs_mount *mp = bp->b_mount; |
1e697959 | 186 | xfs_failaddr_t fa; |
d9241d7e | 187 | int blksize = mp->m_attr_geo->blksize; |
f08bc2a9 DC |
188 | char *ptr; |
189 | int len; | |
190 | xfs_daddr_t bno; | |
59915981 DC |
191 | |
192 | /* no verification of non-crc buffers */ | |
b16a427a | 193 | if (!xfs_has_crc(mp)) |
59915981 DC |
194 | return; |
195 | ||
f08bc2a9 | 196 | ptr = bp->b_addr; |
f1208396 | 197 | bno = xfs_buf_daddr(bp); |
f08bc2a9 | 198 | len = BBTOB(bp->b_length); |
ff105f75 | 199 | ASSERT(len >= blksize); |
f08bc2a9 DC |
200 | |
201 | while (len > 0) { | |
d9241d7e DC |
202 | struct xfs_attr3_rmt_hdr *rmt = (struct xfs_attr3_rmt_hdr *)ptr; |
203 | ||
68dbe77f | 204 | fa = xfs_attr3_rmt_verify(mp, bp, ptr, blksize, bno); |
1e697959 DW |
205 | if (fa) { |
206 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
f08bc2a9 DC |
207 | return; |
208 | } | |
59915981 | 209 | |
d9241d7e DC |
210 | /* |
211 | * Ensure we aren't writing bogus LSNs to disk. See | |
212 | * xfs_attr3_rmt_hdr_set() for the explanation. | |
213 | */ | |
214 | if (rmt->rm_lsn != cpu_to_be64(NULLCOMMITLSN)) { | |
1e697959 | 215 | xfs_verifier_error(bp, -EFSCORRUPTED, __this_address); |
d9241d7e | 216 | return; |
f08bc2a9 | 217 | } |
ff105f75 | 218 | xfs_update_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF); |
f08bc2a9 | 219 | |
ff105f75 DC |
220 | len -= blksize; |
221 | ptr += blksize; | |
222 | bno += BTOBB(blksize); | |
59915981 | 223 | } |
7e6c95f1 DW |
224 | |
225 | if (len != 0) | |
1e697959 | 226 | xfs_verifier_error(bp, -EFSCORRUPTED, __this_address); |
59915981 DC |
227 | } |
228 | ||
229 | const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = { | |
a3fac935 | 230 | .name = "xfs_attr3_rmt", |
68dbe77f | 231 | .magic = { 0, cpu_to_be32(XFS_ATTR3_RMT_MAGIC) }, |
59915981 DC |
232 | .verify_read = xfs_attr3_rmt_read_verify, |
233 | .verify_write = xfs_attr3_rmt_write_verify, | |
95d9582b | 234 | .verify_struct = xfs_attr3_rmt_verify_struct, |
59915981 DC |
235 | }; |
236 | ||
f08bc2a9 | 237 | STATIC int |
59915981 DC |
238 | xfs_attr3_rmt_hdr_set( |
239 | struct xfs_mount *mp, | |
f08bc2a9 | 240 | void *ptr, |
59915981 DC |
241 | xfs_ino_t ino, |
242 | uint32_t offset, | |
243 | uint32_t size, | |
f08bc2a9 | 244 | xfs_daddr_t bno) |
59915981 | 245 | { |
f08bc2a9 | 246 | struct xfs_attr3_rmt_hdr *rmt = ptr; |
59915981 | 247 | |
b16a427a | 248 | if (!xfs_has_crc(mp)) |
59915981 DC |
249 | return 0; |
250 | ||
251 | rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC); | |
252 | rmt->rm_offset = cpu_to_be32(offset); | |
253 | rmt->rm_bytes = cpu_to_be32(size); | |
9c4e12fb | 254 | uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid); |
59915981 | 255 | rmt->rm_owner = cpu_to_be64(ino); |
f08bc2a9 | 256 | rmt->rm_blkno = cpu_to_be64(bno); |
59915981 | 257 | |
d9241d7e DC |
258 | /* |
259 | * Remote attribute blocks are written synchronously, so we don't | |
260 | * have an LSN that we can stamp in them that makes any sense to log | |
261 | * recovery. To ensure that log recovery handles overwrites of these | |
262 | * blocks sanely (i.e. once they've been freed and reallocated as some | |
263 | * other type of metadata) we need to ensure that the LSN has a value | |
264 | * that tells log recovery to ignore the LSN and overwrite the buffer | |
265 | * with whatever is in it's log. To do this, we use the magic | |
266 | * NULLCOMMITLSN to indicate that the LSN is invalid. | |
267 | */ | |
268 | rmt->rm_lsn = cpu_to_be64(NULLCOMMITLSN); | |
269 | ||
59915981 DC |
270 | return sizeof(struct xfs_attr3_rmt_hdr); |
271 | } | |
272 | ||
273 | /* | |
f08bc2a9 | 274 | * Helper functions to copy attribute data in and out of the one disk extents |
59915981 | 275 | */ |
f08bc2a9 DC |
276 | STATIC int |
277 | xfs_attr_rmtval_copyout( | |
278 | struct xfs_mount *mp, | |
279 | struct xfs_buf *bp, | |
280 | xfs_ino_t ino, | |
281 | int *offset, | |
282 | int *valuelen, | |
4a492e72 | 283 | uint8_t **dst) |
59915981 | 284 | { |
f08bc2a9 | 285 | char *src = bp->b_addr; |
f1208396 | 286 | xfs_daddr_t bno = xfs_buf_daddr(bp); |
f08bc2a9 | 287 | int len = BBTOB(bp->b_length); |
ff105f75 | 288 | int blksize = mp->m_attr_geo->blksize; |
59915981 | 289 | |
ff105f75 | 290 | ASSERT(len >= blksize); |
59915981 | 291 | |
f08bc2a9 DC |
292 | while (len > 0 && *valuelen > 0) { |
293 | int hdr_size = 0; | |
ff105f75 | 294 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); |
f08bc2a9 DC |
295 | |
296 | byte_cnt = min(*valuelen, byte_cnt); | |
297 | ||
b16a427a | 298 | if (xfs_has_crc(mp)) { |
bc01119d | 299 | if (xfs_attr3_rmt_hdr_ok(src, ino, *offset, |
f08bc2a9 DC |
300 | byte_cnt, bno)) { |
301 | xfs_alert(mp, | |
302 | "remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)", | |
303 | bno, *offset, byte_cnt, ino); | |
12b53197 | 304 | return -EFSCORRUPTED; |
f08bc2a9 DC |
305 | } |
306 | hdr_size = sizeof(struct xfs_attr3_rmt_hdr); | |
307 | } | |
308 | ||
309 | memcpy(*dst, src + hdr_size, byte_cnt); | |
310 | ||
311 | /* roll buffer forwards */ | |
ff105f75 DC |
312 | len -= blksize; |
313 | src += blksize; | |
314 | bno += BTOBB(blksize); | |
f08bc2a9 DC |
315 | |
316 | /* roll attribute data forwards */ | |
317 | *valuelen -= byte_cnt; | |
318 | *dst += byte_cnt; | |
319 | *offset += byte_cnt; | |
320 | } | |
321 | return 0; | |
322 | } | |
323 | ||
324 | STATIC void | |
325 | xfs_attr_rmtval_copyin( | |
326 | struct xfs_mount *mp, | |
327 | struct xfs_buf *bp, | |
328 | xfs_ino_t ino, | |
329 | int *offset, | |
330 | int *valuelen, | |
4a492e72 | 331 | uint8_t **src) |
f08bc2a9 DC |
332 | { |
333 | char *dst = bp->b_addr; | |
f1208396 | 334 | xfs_daddr_t bno = xfs_buf_daddr(bp); |
f08bc2a9 | 335 | int len = BBTOB(bp->b_length); |
ff105f75 | 336 | int blksize = mp->m_attr_geo->blksize; |
f08bc2a9 | 337 | |
ff105f75 | 338 | ASSERT(len >= blksize); |
f08bc2a9 DC |
339 | |
340 | while (len > 0 && *valuelen > 0) { | |
341 | int hdr_size; | |
ff105f75 | 342 | int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); |
f08bc2a9 DC |
343 | |
344 | byte_cnt = min(*valuelen, byte_cnt); | |
345 | hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset, | |
346 | byte_cnt, bno); | |
347 | ||
348 | memcpy(dst + hdr_size, *src, byte_cnt); | |
349 | ||
350 | /* | |
351 | * If this is the last block, zero the remainder of it. | |
352 | * Check that we are actually the last block, too. | |
353 | */ | |
ff105f75 | 354 | if (byte_cnt + hdr_size < blksize) { |
f08bc2a9 | 355 | ASSERT(*valuelen - byte_cnt == 0); |
ff105f75 | 356 | ASSERT(len == blksize); |
f08bc2a9 | 357 | memset(dst + hdr_size + byte_cnt, 0, |
ff105f75 | 358 | blksize - hdr_size - byte_cnt); |
f08bc2a9 DC |
359 | } |
360 | ||
361 | /* roll buffer forwards */ | |
ff105f75 DC |
362 | len -= blksize; |
363 | dst += blksize; | |
364 | bno += BTOBB(blksize); | |
f08bc2a9 DC |
365 | |
366 | /* roll attribute data forwards */ | |
367 | *valuelen -= byte_cnt; | |
368 | *src += byte_cnt; | |
369 | *offset += byte_cnt; | |
370 | } | |
59915981 DC |
371 | } |
372 | ||
9d6fabc0 DC |
373 | /* |
374 | * Read the value associated with an attribute from the out-of-line buffer | |
375 | * that we stored it in. | |
42a383ab DC |
376 | * |
377 | * Returns 0 on successful retrieval, otherwise an error. | |
9d6fabc0 DC |
378 | */ |
379 | int | |
59915981 DC |
380 | xfs_attr_rmtval_get( |
381 | struct xfs_da_args *args) | |
9d6fabc0 | 382 | { |
59915981 DC |
383 | struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE]; |
384 | struct xfs_mount *mp = args->dp->i_mount; | |
385 | struct xfs_buf *bp; | |
59915981 | 386 | xfs_dablk_t lblkno = args->rmtblkno; |
4a492e72 | 387 | uint8_t *dst = args->value; |
ff105f75 | 388 | int valuelen; |
59915981 DC |
389 | int nmap; |
390 | int error; | |
f08bc2a9 | 391 | int blkcnt = args->rmtblkcnt; |
59915981 DC |
392 | int i; |
393 | int offset = 0; | |
9d6fabc0 DC |
394 | |
395 | trace_xfs_attr_rmtval_get(args); | |
396 | ||
c1a80a3b | 397 | ASSERT(args->valuelen != 0); |
ff105f75 | 398 | ASSERT(args->rmtvaluelen == args->valuelen); |
9d6fabc0 | 399 | |
ff105f75 | 400 | valuelen = args->rmtvaluelen; |
9d6fabc0 DC |
401 | while (valuelen > 0) { |
402 | nmap = ATTR_RMTVALUE_MAPSIZE; | |
403 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
72e78b51 | 404 | blkcnt, map, &nmap, |
9d6fabc0 DC |
405 | XFS_BMAPI_ATTRFORK); |
406 | if (error) | |
59915981 | 407 | return error; |
9d6fabc0 DC |
408 | ASSERT(nmap >= 1); |
409 | ||
410 | for (i = 0; (i < nmap) && (valuelen > 0); i++) { | |
f08bc2a9 DC |
411 | xfs_daddr_t dblkno; |
412 | int dblkcnt; | |
59915981 | 413 | |
9d6fabc0 DC |
414 | ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && |
415 | (map[i].br_startblock != HOLESTARTBLOCK)); | |
416 | dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); | |
f08bc2a9 | 417 | dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); |
31079e67 DW |
418 | error = xfs_buf_read(mp->m_ddev_targp, dblkno, dblkcnt, |
419 | 0, &bp, &xfs_attr3_rmt_buf_ops); | |
420 | if (error) | |
421 | return error; | |
59915981 | 422 | |
f08bc2a9 DC |
423 | error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino, |
424 | &offset, &valuelen, | |
425 | &dst); | |
a8bbb628 | 426 | xfs_buf_relse(bp); |
f08bc2a9 DC |
427 | if (error) |
428 | return error; | |
59915981 | 429 | |
f08bc2a9 | 430 | /* roll attribute extent map forwards */ |
9d6fabc0 | 431 | lblkno += map[i].br_blockcount; |
f08bc2a9 | 432 | blkcnt -= map[i].br_blockcount; |
9d6fabc0 DC |
433 | } |
434 | } | |
435 | ASSERT(valuelen == 0); | |
59915981 | 436 | return 0; |
9d6fabc0 DC |
437 | } |
438 | ||
439 | /* | |
91986fc1 | 440 | * Find a "hole" in the attribute address space large enough for us to drop the |
d6d6237c | 441 | * new attributes value into |
9d6fabc0 | 442 | */ |
d6d6237c | 443 | int |
91986fc1 | 444 | xfs_attr_rmt_find_hole( |
59915981 | 445 | struct xfs_da_args *args) |
9d6fabc0 | 446 | { |
59915981 DC |
447 | struct xfs_inode *dp = args->dp; |
448 | struct xfs_mount *mp = dp->i_mount; | |
59915981 | 449 | int error; |
91986fc1 AC |
450 | int blkcnt; |
451 | xfs_fileoff_t lfileoff = 0; | |
9d6fabc0 | 452 | |
9d6fabc0 | 453 | /* |
91986fc1 AC |
454 | * Because CRC enable attributes have headers, we can't just do a |
455 | * straight byte to FSB conversion and have to take the header space | |
456 | * into account. | |
9d6fabc0 | 457 | */ |
ff105f75 | 458 | blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen); |
9d6fabc0 DC |
459 | error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, |
460 | XFS_ATTR_FORK); | |
59915981 DC |
461 | if (error) |
462 | return error; | |
463 | ||
91986fc1 | 464 | args->rmtblkno = (xfs_dablk_t)lfileoff; |
9d6fabc0 DC |
465 | args->rmtblkcnt = blkcnt; |
466 | ||
91986fc1 AC |
467 | return 0; |
468 | } | |
9d6fabc0 | 469 | |
d6d6237c | 470 | int |
91986fc1 AC |
471 | xfs_attr_rmtval_set_value( |
472 | struct xfs_da_args *args) | |
473 | { | |
474 | struct xfs_inode *dp = args->dp; | |
475 | struct xfs_mount *mp = dp->i_mount; | |
476 | struct xfs_bmbt_irec map; | |
477 | xfs_dablk_t lblkno; | |
478 | uint8_t *src = args->value; | |
479 | int blkcnt; | |
480 | int valuelen; | |
481 | int nmap; | |
482 | int error; | |
483 | int offset = 0; | |
9d6fabc0 DC |
484 | |
485 | /* | |
486 | * Roll through the "value", copying the attribute value to the | |
487 | * already-allocated blocks. Blocks are written synchronously | |
488 | * so that we can know they are all on disk before we turn off | |
489 | * the INCOMPLETE flag. | |
490 | */ | |
491 | lblkno = args->rmtblkno; | |
4da23ca6 | 492 | blkcnt = args->rmtblkcnt; |
ff105f75 | 493 | valuelen = args->rmtvaluelen; |
9d6fabc0 | 494 | while (valuelen > 0) { |
f08bc2a9 DC |
495 | struct xfs_buf *bp; |
496 | xfs_daddr_t dblkno; | |
497 | int dblkcnt; | |
498 | ||
499 | ASSERT(blkcnt > 0); | |
9d6fabc0 | 500 | |
9d6fabc0 DC |
501 | nmap = 1; |
502 | error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno, | |
4da23ca6 | 503 | blkcnt, &map, &nmap, |
9d6fabc0 DC |
504 | XFS_BMAPI_ATTRFORK); |
505 | if (error) | |
af43ca9f | 506 | return error; |
9d6fabc0 DC |
507 | ASSERT(nmap == 1); |
508 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && | |
509 | (map.br_startblock != HOLESTARTBLOCK)); | |
510 | ||
511 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), | |
4da23ca6 | 512 | dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
9d6fabc0 | 513 | |
58a8b31f DW |
514 | error = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, &bp); |
515 | if (error) | |
516 | return error; | |
59915981 DC |
517 | bp->b_ops = &xfs_attr3_rmt_buf_ops; |
518 | ||
f08bc2a9 DC |
519 | xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset, |
520 | &valuelen, &src); | |
9d6fabc0 DC |
521 | |
522 | error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ | |
523 | xfs_buf_relse(bp); | |
524 | if (error) | |
525 | return error; | |
59915981 | 526 | |
9d6fabc0 | 527 | |
f08bc2a9 | 528 | /* roll attribute extent map forwards */ |
9d6fabc0 | 529 | lblkno += map.br_blockcount; |
4da23ca6 | 530 | blkcnt -= map.br_blockcount; |
9d6fabc0 DC |
531 | } |
532 | ASSERT(valuelen == 0); | |
59915981 | 533 | return 0; |
9d6fabc0 DC |
534 | } |
535 | ||
5867837a DW |
536 | /* Mark stale any incore buffers for the remote value. */ |
537 | int | |
538 | xfs_attr_rmtval_stale( | |
539 | struct xfs_inode *ip, | |
540 | struct xfs_bmbt_irec *map, | |
541 | xfs_buf_flags_t incore_flags) | |
542 | { | |
543 | struct xfs_mount *mp = ip->i_mount; | |
544 | struct xfs_buf *bp; | |
0b2f4162 | 545 | int error; |
5867837a DW |
546 | |
547 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); | |
548 | ||
549 | if (XFS_IS_CORRUPT(mp, map->br_startblock == DELAYSTARTBLOCK) || | |
550 | XFS_IS_CORRUPT(mp, map->br_startblock == HOLESTARTBLOCK)) | |
551 | return -EFSCORRUPTED; | |
552 | ||
0b2f4162 | 553 | error = xfs_buf_incore(mp->m_ddev_targp, |
5867837a | 554 | XFS_FSB_TO_DADDR(mp, map->br_startblock), |
0b2f4162 DC |
555 | XFS_FSB_TO_BB(mp, map->br_blockcount), |
556 | incore_flags, &bp); | |
557 | if (error) { | |
558 | if (error == -ENOENT) | |
559 | return 0; | |
560 | return error; | |
5867837a DW |
561 | } |
562 | ||
0b2f4162 DC |
563 | xfs_buf_stale(bp); |
564 | xfs_buf_relse(bp); | |
5867837a DW |
565 | return 0; |
566 | } | |
567 | ||
d6d6237c AH |
568 | /* |
569 | * Find a hole for the attr and store it in the delayed attr context. This | |
570 | * initializes the context to roll through allocating an attr extent for a | |
571 | * delayed attr operation | |
572 | */ | |
573 | int | |
574 | xfs_attr_rmtval_find_space( | |
eff5933f | 575 | struct xfs_attr_intent *attr) |
d6d6237c | 576 | { |
a951e052 AH |
577 | struct xfs_da_args *args = attr->xattri_da_args; |
578 | struct xfs_bmbt_irec *map = &attr->xattri_map; | |
d6d6237c AH |
579 | int error; |
580 | ||
a951e052 AH |
581 | attr->xattri_lblkno = 0; |
582 | attr->xattri_blkcnt = 0; | |
d6d6237c AH |
583 | args->rmtblkcnt = 0; |
584 | args->rmtblkno = 0; | |
585 | memset(map, 0, sizeof(struct xfs_bmbt_irec)); | |
586 | ||
587 | error = xfs_attr_rmt_find_hole(args); | |
588 | if (error) | |
589 | return error; | |
590 | ||
a951e052 AH |
591 | attr->xattri_blkcnt = args->rmtblkcnt; |
592 | attr->xattri_lblkno = args->rmtblkno; | |
d6d6237c AH |
593 | |
594 | return 0; | |
595 | } | |
596 | ||
597 | /* | |
598 | * Write one block of the value associated with an attribute into the | |
599 | * out-of-line buffer that we have defined for it. This is similar to a subset | |
600 | * of xfs_attr_rmtval_set, but records the current block to the delayed attr | |
601 | * context, and leaves transaction handling to the caller. | |
602 | */ | |
603 | int | |
604 | xfs_attr_rmtval_set_blk( | |
eff5933f | 605 | struct xfs_attr_intent *attr) |
d6d6237c | 606 | { |
a951e052 | 607 | struct xfs_da_args *args = attr->xattri_da_args; |
d6d6237c | 608 | struct xfs_inode *dp = args->dp; |
a951e052 | 609 | struct xfs_bmbt_irec *map = &attr->xattri_map; |
d6d6237c AH |
610 | int nmap; |
611 | int error; | |
612 | ||
613 | nmap = 1; | |
a951e052 AH |
614 | error = xfs_bmapi_write(args->trans, dp, |
615 | (xfs_fileoff_t)attr->xattri_lblkno, | |
616 | attr->xattri_blkcnt, XFS_BMAPI_ATTRFORK, args->total, | |
d6d6237c AH |
617 | map, &nmap); |
618 | if (error) | |
619 | return error; | |
620 | ||
621 | ASSERT(nmap == 1); | |
622 | ASSERT((map->br_startblock != DELAYSTARTBLOCK) && | |
623 | (map->br_startblock != HOLESTARTBLOCK)); | |
624 | ||
625 | /* roll attribute extent map forwards */ | |
a951e052 AH |
626 | attr->xattri_lblkno += map->br_blockcount; |
627 | attr->xattri_blkcnt -= map->br_blockcount; | |
d6d6237c AH |
628 | |
629 | return 0; | |
630 | } | |
631 | ||
9d6fabc0 DC |
632 | /* |
633 | * Remove the value associated with an attribute by deleting the | |
634 | * out-of-line buffer that it is stored on. | |
635 | */ | |
636 | int | |
5a2edbba | 637 | xfs_attr_rmtval_invalidate( |
f08bc2a9 | 638 | struct xfs_da_args *args) |
9d6fabc0 | 639 | { |
f08bc2a9 DC |
640 | xfs_dablk_t lblkno; |
641 | int blkcnt; | |
642 | int error; | |
9d6fabc0 | 643 | |
9d6fabc0 | 644 | /* |
526f9be5 | 645 | * Roll through the "value", invalidating the attribute value's blocks. |
9d6fabc0 DC |
646 | */ |
647 | lblkno = args->rmtblkno; | |
f08bc2a9 DC |
648 | blkcnt = args->rmtblkcnt; |
649 | while (blkcnt > 0) { | |
650 | struct xfs_bmbt_irec map; | |
f08bc2a9 | 651 | int nmap; |
526f9be5 | 652 | |
9d6fabc0 DC |
653 | /* |
654 | * Try to remember where we decided to put the value. | |
655 | */ | |
656 | nmap = 1; | |
657 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, | |
526f9be5 | 658 | blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); |
9d6fabc0 | 659 | if (error) |
af43ca9f | 660 | return error; |
5867837a DW |
661 | if (XFS_IS_CORRUPT(args->dp->i_mount, nmap != 1)) |
662 | return -EFSCORRUPTED; | |
663 | error = xfs_attr_rmtval_stale(args->dp, &map, XBF_TRYLOCK); | |
664 | if (error) | |
665 | return error; | |
9d6fabc0 | 666 | |
9d6fabc0 | 667 | lblkno += map.br_blockcount; |
526f9be5 | 668 | blkcnt -= map.br_blockcount; |
9d6fabc0 | 669 | } |
5a2edbba AC |
670 | return 0; |
671 | } | |
9d6fabc0 | 672 | |
978b6ada AC |
673 | /* |
674 | * Remove the value associated with an attribute by deleting the out-of-line | |
c749b4e1 AH |
675 | * buffer that it is stored on. Returns -EAGAIN for the caller to refresh the |
676 | * transaction and re-call the function. Callers should keep calling this | |
677 | * routine until it returns something other than -EAGAIN. | |
978b6ada AC |
678 | */ |
679 | int | |
4acc0d5d | 680 | xfs_attr_rmtval_remove( |
eff5933f | 681 | struct xfs_attr_intent *attr) |
978b6ada | 682 | { |
a951e052 | 683 | struct xfs_da_args *args = attr->xattri_da_args; |
c749b4e1 | 684 | int error, done; |
978b6ada AC |
685 | |
686 | /* | |
687 | * Unmap value blocks for this attr. | |
688 | */ | |
689 | error = xfs_bunmapi(args->trans, args->dp, args->rmtblkno, | |
690 | args->rmtblkcnt, XFS_BMAPI_ATTRFORK, 1, &done); | |
691 | if (error) | |
692 | return error; | |
693 | ||
c749b4e1 AH |
694 | /* |
695 | * We don't need an explicit state here to pick up where we left off. We | |
696 | * can figure it out using the !done return code. The actual value of | |
697 | * attr->xattri_dela_state may be some value reminiscent of the calling | |
698 | * function, but it's value is irrelevant with in the context of this | |
699 | * function. Once we are done here, the next state is set as needed by | |
700 | * the parent | |
701 | */ | |
702 | if (!done) { | |
a951e052 AH |
703 | trace_xfs_attr_rmtval_remove_return(attr->xattri_dela_state, |
704 | args->dp); | |
978b6ada | 705 | return -EAGAIN; |
c749b4e1 | 706 | } |
978b6ada | 707 | |
c749b4e1 AH |
708 | args->rmtblkno = 0; |
709 | args->rmtblkcnt = 0; | |
710 | return 0; | |
978b6ada | 711 | } |