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[mirror_ubuntu-bionic-kernel.git] / fs / xfs / xfs_fsops.c
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_sb.h"
25 #include "xfs_mount.h"
26 #include "xfs_defer.h"
27 #include "xfs_da_format.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_trans.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_error.h"
33 #include "xfs_btree.h"
34 #include "xfs_alloc_btree.h"
35 #include "xfs_alloc.h"
36 #include "xfs_rmap_btree.h"
37 #include "xfs_ialloc.h"
38 #include "xfs_fsops.h"
39 #include "xfs_itable.h"
40 #include "xfs_trans_space.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_trace.h"
43 #include "xfs_log.h"
44 #include "xfs_filestream.h"
45 #include "xfs_rmap.h"
46 #include "xfs_ag_resv.h"
47
48 /*
49 * File system operations
50 */
51
52 int
53 xfs_fs_geometry(
54 xfs_mount_t *mp,
55 xfs_fsop_geom_t *geo,
56 int new_version)
57 {
58
59 memset(geo, 0, sizeof(*geo));
60
61 geo->blocksize = mp->m_sb.sb_blocksize;
62 geo->rtextsize = mp->m_sb.sb_rextsize;
63 geo->agblocks = mp->m_sb.sb_agblocks;
64 geo->agcount = mp->m_sb.sb_agcount;
65 geo->logblocks = mp->m_sb.sb_logblocks;
66 geo->sectsize = mp->m_sb.sb_sectsize;
67 geo->inodesize = mp->m_sb.sb_inodesize;
68 geo->imaxpct = mp->m_sb.sb_imax_pct;
69 geo->datablocks = mp->m_sb.sb_dblocks;
70 geo->rtblocks = mp->m_sb.sb_rblocks;
71 geo->rtextents = mp->m_sb.sb_rextents;
72 geo->logstart = mp->m_sb.sb_logstart;
73 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
74 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
75 if (new_version >= 2) {
76 geo->sunit = mp->m_sb.sb_unit;
77 geo->swidth = mp->m_sb.sb_width;
78 }
79 if (new_version >= 3) {
80 geo->version = XFS_FSOP_GEOM_VERSION;
81 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
82 XFS_FSOP_GEOM_FLAGS_DIRV2 |
83 (xfs_sb_version_hasattr(&mp->m_sb) ?
84 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
85 (xfs_sb_version_hasquota(&mp->m_sb) ?
86 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
87 (xfs_sb_version_hasalign(&mp->m_sb) ?
88 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
89 (xfs_sb_version_hasdalign(&mp->m_sb) ?
90 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
91 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
92 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
93 (xfs_sb_version_hassector(&mp->m_sb) ?
94 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
95 (xfs_sb_version_hasasciici(&mp->m_sb) ?
96 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
97 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
98 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
99 (xfs_sb_version_hasattr2(&mp->m_sb) ?
100 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
101 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
102 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
103 (xfs_sb_version_hascrc(&mp->m_sb) ?
104 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
105 (xfs_sb_version_hasftype(&mp->m_sb) ?
106 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
107 (xfs_sb_version_hasfinobt(&mp->m_sb) ?
108 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
109 (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
110 XFS_FSOP_GEOM_FLAGS_SPINODES : 0) |
111 (xfs_sb_version_hasrmapbt(&mp->m_sb) ?
112 XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
113 (xfs_sb_version_hasreflink(&mp->m_sb) ?
114 XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
115 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
116 mp->m_sb.sb_logsectsize : BBSIZE;
117 geo->rtsectsize = mp->m_sb.sb_blocksize;
118 geo->dirblocksize = mp->m_dir_geo->blksize;
119 }
120 if (new_version >= 4) {
121 geo->flags |=
122 (xfs_sb_version_haslogv2(&mp->m_sb) ?
123 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
124 geo->logsunit = mp->m_sb.sb_logsunit;
125 }
126 return 0;
127 }
128
129 static struct xfs_buf *
130 xfs_growfs_get_hdr_buf(
131 struct xfs_mount *mp,
132 xfs_daddr_t blkno,
133 size_t numblks,
134 int flags,
135 const struct xfs_buf_ops *ops)
136 {
137 struct xfs_buf *bp;
138
139 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
140 if (!bp)
141 return NULL;
142
143 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
144 bp->b_bn = blkno;
145 bp->b_maps[0].bm_bn = blkno;
146 bp->b_ops = ops;
147
148 return bp;
149 }
150
151 static int
152 xfs_growfs_data_private(
153 xfs_mount_t *mp, /* mount point for filesystem */
154 xfs_growfs_data_t *in) /* growfs data input struct */
155 {
156 xfs_agf_t *agf;
157 struct xfs_agfl *agfl;
158 xfs_agi_t *agi;
159 xfs_agnumber_t agno;
160 xfs_extlen_t agsize;
161 xfs_extlen_t tmpsize;
162 xfs_alloc_rec_t *arec;
163 xfs_buf_t *bp;
164 int bucket;
165 int dpct;
166 int error, saved_error = 0;
167 xfs_agnumber_t nagcount;
168 xfs_agnumber_t nagimax = 0;
169 xfs_rfsblock_t nb, nb_mod;
170 xfs_rfsblock_t new;
171 xfs_rfsblock_t nfree;
172 xfs_agnumber_t oagcount;
173 int pct;
174 xfs_trans_t *tp;
175
176 nb = in->newblocks;
177 pct = in->imaxpct;
178 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
179 return -EINVAL;
180 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
181 return error;
182 dpct = pct - mp->m_sb.sb_imax_pct;
183 error = xfs_buf_read_uncached(mp->m_ddev_targp,
184 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
185 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
186 if (error)
187 return error;
188 xfs_buf_relse(bp);
189
190 new = nb; /* use new as a temporary here */
191 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
192 nagcount = new + (nb_mod != 0);
193 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
194 nagcount--;
195 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
196 if (nb < mp->m_sb.sb_dblocks)
197 return -EINVAL;
198 }
199 new = nb - mp->m_sb.sb_dblocks;
200 oagcount = mp->m_sb.sb_agcount;
201
202 /* allocate the new per-ag structures */
203 if (nagcount > oagcount) {
204 error = xfs_initialize_perag(mp, nagcount, &nagimax);
205 if (error)
206 return error;
207 }
208
209 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
210 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
211 if (error)
212 return error;
213
214 /*
215 * Write new AG headers to disk. Non-transactional, but written
216 * synchronously so they are completed prior to the growfs transaction
217 * being logged.
218 */
219 nfree = 0;
220 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
221 __be32 *agfl_bno;
222
223 /*
224 * AG freespace header block
225 */
226 bp = xfs_growfs_get_hdr_buf(mp,
227 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
228 XFS_FSS_TO_BB(mp, 1), 0,
229 &xfs_agf_buf_ops);
230 if (!bp) {
231 error = -ENOMEM;
232 goto error0;
233 }
234
235 agf = XFS_BUF_TO_AGF(bp);
236 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
237 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
238 agf->agf_seqno = cpu_to_be32(agno);
239 if (agno == nagcount - 1)
240 agsize =
241 nb -
242 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
243 else
244 agsize = mp->m_sb.sb_agblocks;
245 agf->agf_length = cpu_to_be32(agsize);
246 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
247 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
248 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
249 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
250 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
251 agf->agf_roots[XFS_BTNUM_RMAPi] =
252 cpu_to_be32(XFS_RMAP_BLOCK(mp));
253 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
254 agf->agf_rmap_blocks = cpu_to_be32(1);
255 }
256
257 agf->agf_flfirst = cpu_to_be32(1);
258 agf->agf_fllast = 0;
259 agf->agf_flcount = 0;
260 tmpsize = agsize - mp->m_ag_prealloc_blocks;
261 agf->agf_freeblks = cpu_to_be32(tmpsize);
262 agf->agf_longest = cpu_to_be32(tmpsize);
263 if (xfs_sb_version_hascrc(&mp->m_sb))
264 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
265 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
266 agf->agf_refcount_root = cpu_to_be32(
267 xfs_refc_block(mp));
268 agf->agf_refcount_level = cpu_to_be32(1);
269 agf->agf_refcount_blocks = cpu_to_be32(1);
270 }
271
272 error = xfs_bwrite(bp);
273 xfs_buf_relse(bp);
274 if (error)
275 goto error0;
276
277 /*
278 * AG freelist header block
279 */
280 bp = xfs_growfs_get_hdr_buf(mp,
281 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
282 XFS_FSS_TO_BB(mp, 1), 0,
283 &xfs_agfl_buf_ops);
284 if (!bp) {
285 error = -ENOMEM;
286 goto error0;
287 }
288
289 agfl = XFS_BUF_TO_AGFL(bp);
290 if (xfs_sb_version_hascrc(&mp->m_sb)) {
291 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
292 agfl->agfl_seqno = cpu_to_be32(agno);
293 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
294 }
295
296 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
297 for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
298 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
299
300 error = xfs_bwrite(bp);
301 xfs_buf_relse(bp);
302 if (error)
303 goto error0;
304
305 /*
306 * AG inode header block
307 */
308 bp = xfs_growfs_get_hdr_buf(mp,
309 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
310 XFS_FSS_TO_BB(mp, 1), 0,
311 &xfs_agi_buf_ops);
312 if (!bp) {
313 error = -ENOMEM;
314 goto error0;
315 }
316
317 agi = XFS_BUF_TO_AGI(bp);
318 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
319 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
320 agi->agi_seqno = cpu_to_be32(agno);
321 agi->agi_length = cpu_to_be32(agsize);
322 agi->agi_count = 0;
323 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
324 agi->agi_level = cpu_to_be32(1);
325 agi->agi_freecount = 0;
326 agi->agi_newino = cpu_to_be32(NULLAGINO);
327 agi->agi_dirino = cpu_to_be32(NULLAGINO);
328 if (xfs_sb_version_hascrc(&mp->m_sb))
329 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
330 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
331 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
332 agi->agi_free_level = cpu_to_be32(1);
333 }
334 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
335 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
336
337 error = xfs_bwrite(bp);
338 xfs_buf_relse(bp);
339 if (error)
340 goto error0;
341
342 /*
343 * BNO btree root block
344 */
345 bp = xfs_growfs_get_hdr_buf(mp,
346 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
347 BTOBB(mp->m_sb.sb_blocksize), 0,
348 &xfs_allocbt_buf_ops);
349
350 if (!bp) {
351 error = -ENOMEM;
352 goto error0;
353 }
354
355 xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, agno, 0);
356
357 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
358 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
359 arec->ar_blockcount = cpu_to_be32(
360 agsize - be32_to_cpu(arec->ar_startblock));
361
362 error = xfs_bwrite(bp);
363 xfs_buf_relse(bp);
364 if (error)
365 goto error0;
366
367 /*
368 * CNT btree root block
369 */
370 bp = xfs_growfs_get_hdr_buf(mp,
371 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
372 BTOBB(mp->m_sb.sb_blocksize), 0,
373 &xfs_allocbt_buf_ops);
374 if (!bp) {
375 error = -ENOMEM;
376 goto error0;
377 }
378
379 xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, agno, 0);
380
381 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
382 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
383 arec->ar_blockcount = cpu_to_be32(
384 agsize - be32_to_cpu(arec->ar_startblock));
385 nfree += be32_to_cpu(arec->ar_blockcount);
386
387 error = xfs_bwrite(bp);
388 xfs_buf_relse(bp);
389 if (error)
390 goto error0;
391
392 /* RMAP btree root block */
393 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
394 struct xfs_rmap_rec *rrec;
395 struct xfs_btree_block *block;
396
397 bp = xfs_growfs_get_hdr_buf(mp,
398 XFS_AGB_TO_DADDR(mp, agno, XFS_RMAP_BLOCK(mp)),
399 BTOBB(mp->m_sb.sb_blocksize), 0,
400 &xfs_rmapbt_buf_ops);
401 if (!bp) {
402 error = -ENOMEM;
403 goto error0;
404 }
405
406 xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 0,
407 agno, 0);
408 block = XFS_BUF_TO_BLOCK(bp);
409
410
411 /*
412 * mark the AG header regions as static metadata The BNO
413 * btree block is the first block after the headers, so
414 * it's location defines the size of region the static
415 * metadata consumes.
416 *
417 * Note: unlike mkfs, we never have to account for log
418 * space when growing the data regions
419 */
420 rrec = XFS_RMAP_REC_ADDR(block, 1);
421 rrec->rm_startblock = 0;
422 rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
423 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
424 rrec->rm_offset = 0;
425 be16_add_cpu(&block->bb_numrecs, 1);
426
427 /* account freespace btree root blocks */
428 rrec = XFS_RMAP_REC_ADDR(block, 2);
429 rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
430 rrec->rm_blockcount = cpu_to_be32(2);
431 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
432 rrec->rm_offset = 0;
433 be16_add_cpu(&block->bb_numrecs, 1);
434
435 /* account inode btree root blocks */
436 rrec = XFS_RMAP_REC_ADDR(block, 3);
437 rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
438 rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
439 XFS_IBT_BLOCK(mp));
440 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
441 rrec->rm_offset = 0;
442 be16_add_cpu(&block->bb_numrecs, 1);
443
444 /* account for rmap btree root */
445 rrec = XFS_RMAP_REC_ADDR(block, 4);
446 rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
447 rrec->rm_blockcount = cpu_to_be32(1);
448 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
449 rrec->rm_offset = 0;
450 be16_add_cpu(&block->bb_numrecs, 1);
451
452 /* account for refc btree root */
453 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
454 rrec = XFS_RMAP_REC_ADDR(block, 5);
455 rrec->rm_startblock = cpu_to_be32(
456 xfs_refc_block(mp));
457 rrec->rm_blockcount = cpu_to_be32(1);
458 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
459 rrec->rm_offset = 0;
460 be16_add_cpu(&block->bb_numrecs, 1);
461 }
462
463 error = xfs_bwrite(bp);
464 xfs_buf_relse(bp);
465 if (error)
466 goto error0;
467 }
468
469 /*
470 * INO btree root block
471 */
472 bp = xfs_growfs_get_hdr_buf(mp,
473 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
474 BTOBB(mp->m_sb.sb_blocksize), 0,
475 &xfs_inobt_buf_ops);
476 if (!bp) {
477 error = -ENOMEM;
478 goto error0;
479 }
480
481 xfs_btree_init_block(mp, bp, XFS_BTNUM_INO , 0, 0, agno, 0);
482
483 error = xfs_bwrite(bp);
484 xfs_buf_relse(bp);
485 if (error)
486 goto error0;
487
488 /*
489 * FINO btree root block
490 */
491 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
492 bp = xfs_growfs_get_hdr_buf(mp,
493 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
494 BTOBB(mp->m_sb.sb_blocksize), 0,
495 &xfs_inobt_buf_ops);
496 if (!bp) {
497 error = -ENOMEM;
498 goto error0;
499 }
500
501 xfs_btree_init_block(mp, bp, XFS_BTNUM_FINO,
502 0, 0, agno, 0);
503
504 error = xfs_bwrite(bp);
505 xfs_buf_relse(bp);
506 if (error)
507 goto error0;
508 }
509
510 /*
511 * refcount btree root block
512 */
513 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
514 bp = xfs_growfs_get_hdr_buf(mp,
515 XFS_AGB_TO_DADDR(mp, agno, xfs_refc_block(mp)),
516 BTOBB(mp->m_sb.sb_blocksize), 0,
517 &xfs_refcountbt_buf_ops);
518 if (!bp) {
519 error = -ENOMEM;
520 goto error0;
521 }
522
523 xfs_btree_init_block(mp, bp, XFS_BTNUM_REFC,
524 0, 0, agno, 0);
525
526 error = xfs_bwrite(bp);
527 xfs_buf_relse(bp);
528 if (error)
529 goto error0;
530 }
531 }
532 xfs_trans_agblocks_delta(tp, nfree);
533 /*
534 * There are new blocks in the old last a.g.
535 */
536 if (new) {
537 struct xfs_owner_info oinfo;
538
539 /*
540 * Change the agi length.
541 */
542 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
543 if (error) {
544 goto error0;
545 }
546 ASSERT(bp);
547 agi = XFS_BUF_TO_AGI(bp);
548 be32_add_cpu(&agi->agi_length, new);
549 ASSERT(nagcount == oagcount ||
550 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
551 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
552 /*
553 * Change agf length.
554 */
555 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
556 if (error) {
557 goto error0;
558 }
559 ASSERT(bp);
560 agf = XFS_BUF_TO_AGF(bp);
561 be32_add_cpu(&agf->agf_length, new);
562 ASSERT(be32_to_cpu(agf->agf_length) ==
563 be32_to_cpu(agi->agi_length));
564
565 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
566
567 /*
568 * Free the new space.
569 *
570 * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
571 * this doesn't actually exist in the rmap btree.
572 */
573 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
574 error = xfs_rmap_free(tp, bp, agno,
575 be32_to_cpu(agf->agf_length) - new,
576 new, &oinfo);
577 if (error)
578 goto error0;
579 error = xfs_free_extent(tp,
580 XFS_AGB_TO_FSB(mp, agno,
581 be32_to_cpu(agf->agf_length) - new),
582 new, &oinfo, XFS_AG_RESV_NONE);
583 if (error)
584 goto error0;
585 }
586
587 /*
588 * Update changed superblock fields transactionally. These are not
589 * seen by the rest of the world until the transaction commit applies
590 * them atomically to the superblock.
591 */
592 if (nagcount > oagcount)
593 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
594 if (nb > mp->m_sb.sb_dblocks)
595 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
596 nb - mp->m_sb.sb_dblocks);
597 if (nfree)
598 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
599 if (dpct)
600 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
601 xfs_trans_set_sync(tp);
602 error = xfs_trans_commit(tp);
603 if (error)
604 return error;
605
606 /* New allocation groups fully initialized, so update mount struct */
607 if (nagimax)
608 mp->m_maxagi = nagimax;
609 if (mp->m_sb.sb_imax_pct) {
610 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
611 do_div(icount, 100);
612 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
613 } else
614 mp->m_maxicount = 0;
615 xfs_set_low_space_thresholds(mp);
616 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
617
618 /*
619 * If we expanded the last AG, free the per-AG reservation
620 * so we can reinitialize it with the new size.
621 */
622 if (new) {
623 struct xfs_perag *pag;
624
625 pag = xfs_perag_get(mp, agno);
626 error = xfs_ag_resv_free(pag);
627 xfs_perag_put(pag);
628 if (error)
629 goto out;
630 }
631
632 /* Reserve AG metadata blocks. */
633 error = xfs_fs_reserve_ag_blocks(mp);
634 if (error && error != -ENOSPC)
635 goto out;
636
637 /* update secondary superblocks. */
638 for (agno = 1; agno < nagcount; agno++) {
639 error = 0;
640 /*
641 * new secondary superblocks need to be zeroed, not read from
642 * disk as the contents of the new area we are growing into is
643 * completely unknown.
644 */
645 if (agno < oagcount) {
646 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
647 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
648 XFS_FSS_TO_BB(mp, 1), 0, &bp,
649 &xfs_sb_buf_ops);
650 } else {
651 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
652 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
653 XFS_FSS_TO_BB(mp, 1), 0);
654 if (bp) {
655 bp->b_ops = &xfs_sb_buf_ops;
656 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
657 } else
658 error = -ENOMEM;
659 }
660
661 /*
662 * If we get an error reading or writing alternate superblocks,
663 * continue. xfs_repair chooses the "best" superblock based
664 * on most matches; if we break early, we'll leave more
665 * superblocks un-updated than updated, and xfs_repair may
666 * pick them over the properly-updated primary.
667 */
668 if (error) {
669 xfs_warn(mp,
670 "error %d reading secondary superblock for ag %d",
671 error, agno);
672 saved_error = error;
673 continue;
674 }
675 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
676
677 error = xfs_bwrite(bp);
678 xfs_buf_relse(bp);
679 if (error) {
680 xfs_warn(mp,
681 "write error %d updating secondary superblock for ag %d",
682 error, agno);
683 saved_error = error;
684 continue;
685 }
686 }
687
688 out:
689 return saved_error ? saved_error : error;
690
691 error0:
692 xfs_trans_cancel(tp);
693 return error;
694 }
695
696 static int
697 xfs_growfs_log_private(
698 xfs_mount_t *mp, /* mount point for filesystem */
699 xfs_growfs_log_t *in) /* growfs log input struct */
700 {
701 xfs_extlen_t nb;
702
703 nb = in->newblocks;
704 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
705 return -EINVAL;
706 if (nb == mp->m_sb.sb_logblocks &&
707 in->isint == (mp->m_sb.sb_logstart != 0))
708 return -EINVAL;
709 /*
710 * Moving the log is hard, need new interfaces to sync
711 * the log first, hold off all activity while moving it.
712 * Can have shorter or longer log in the same space,
713 * or transform internal to external log or vice versa.
714 */
715 return -ENOSYS;
716 }
717
718 /*
719 * protected versions of growfs function acquire and release locks on the mount
720 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
721 * XFS_IOC_FSGROWFSRT
722 */
723
724
725 int
726 xfs_growfs_data(
727 xfs_mount_t *mp,
728 xfs_growfs_data_t *in)
729 {
730 int error;
731
732 if (!capable(CAP_SYS_ADMIN))
733 return -EPERM;
734 if (!mutex_trylock(&mp->m_growlock))
735 return -EWOULDBLOCK;
736 error = xfs_growfs_data_private(mp, in);
737 /*
738 * Increment the generation unconditionally, the error could be from
739 * updating the secondary superblocks, in which case the new size
740 * is live already.
741 */
742 mp->m_generation++;
743 mutex_unlock(&mp->m_growlock);
744 return error;
745 }
746
747 int
748 xfs_growfs_log(
749 xfs_mount_t *mp,
750 xfs_growfs_log_t *in)
751 {
752 int error;
753
754 if (!capable(CAP_SYS_ADMIN))
755 return -EPERM;
756 if (!mutex_trylock(&mp->m_growlock))
757 return -EWOULDBLOCK;
758 error = xfs_growfs_log_private(mp, in);
759 mutex_unlock(&mp->m_growlock);
760 return error;
761 }
762
763 /*
764 * exported through ioctl XFS_IOC_FSCOUNTS
765 */
766
767 int
768 xfs_fs_counts(
769 xfs_mount_t *mp,
770 xfs_fsop_counts_t *cnt)
771 {
772 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
773 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
774 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
775 mp->m_alloc_set_aside;
776
777 spin_lock(&mp->m_sb_lock);
778 cnt->freertx = mp->m_sb.sb_frextents;
779 spin_unlock(&mp->m_sb_lock);
780 return 0;
781 }
782
783 /*
784 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
785 *
786 * xfs_reserve_blocks is called to set m_resblks
787 * in the in-core mount table. The number of unused reserved blocks
788 * is kept in m_resblks_avail.
789 *
790 * Reserve the requested number of blocks if available. Otherwise return
791 * as many as possible to satisfy the request. The actual number
792 * reserved are returned in outval
793 *
794 * A null inval pointer indicates that only the current reserved blocks
795 * available should be returned no settings are changed.
796 */
797
798 int
799 xfs_reserve_blocks(
800 xfs_mount_t *mp,
801 uint64_t *inval,
802 xfs_fsop_resblks_t *outval)
803 {
804 int64_t lcounter, delta;
805 int64_t fdblks_delta = 0;
806 uint64_t request;
807 int64_t free;
808 int error = 0;
809
810 /* If inval is null, report current values and return */
811 if (inval == (uint64_t *)NULL) {
812 if (!outval)
813 return -EINVAL;
814 outval->resblks = mp->m_resblks;
815 outval->resblks_avail = mp->m_resblks_avail;
816 return 0;
817 }
818
819 request = *inval;
820
821 /*
822 * With per-cpu counters, this becomes an interesting problem. we need
823 * to work out if we are freeing or allocation blocks first, then we can
824 * do the modification as necessary.
825 *
826 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
827 * hold out any changes while we work out what to do. This means that
828 * the amount of free space can change while we do this, so we need to
829 * retry if we end up trying to reserve more space than is available.
830 */
831 spin_lock(&mp->m_sb_lock);
832
833 /*
834 * If our previous reservation was larger than the current value,
835 * then move any unused blocks back to the free pool. Modify the resblks
836 * counters directly since we shouldn't have any problems unreserving
837 * space.
838 */
839 if (mp->m_resblks > request) {
840 lcounter = mp->m_resblks_avail - request;
841 if (lcounter > 0) { /* release unused blocks */
842 fdblks_delta = lcounter;
843 mp->m_resblks_avail -= lcounter;
844 }
845 mp->m_resblks = request;
846 if (fdblks_delta) {
847 spin_unlock(&mp->m_sb_lock);
848 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
849 spin_lock(&mp->m_sb_lock);
850 }
851
852 goto out;
853 }
854
855 /*
856 * If the request is larger than the current reservation, reserve the
857 * blocks before we update the reserve counters. Sample m_fdblocks and
858 * perform a partial reservation if the request exceeds free space.
859 */
860 error = -ENOSPC;
861 do {
862 free = percpu_counter_sum(&mp->m_fdblocks) -
863 mp->m_alloc_set_aside;
864 if (!free)
865 break;
866
867 delta = request - mp->m_resblks;
868 lcounter = free - delta;
869 if (lcounter < 0)
870 /* We can't satisfy the request, just get what we can */
871 fdblks_delta = free;
872 else
873 fdblks_delta = delta;
874
875 /*
876 * We'll either succeed in getting space from the free block
877 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
878 * things changed while we were calculating fdblks_delta and so
879 * we should try again to see if there is anything left to
880 * reserve.
881 *
882 * Don't set the reserved flag here - we don't want to reserve
883 * the extra reserve blocks from the reserve.....
884 */
885 spin_unlock(&mp->m_sb_lock);
886 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
887 spin_lock(&mp->m_sb_lock);
888 } while (error == -ENOSPC);
889
890 /*
891 * Update the reserve counters if blocks have been successfully
892 * allocated.
893 */
894 if (!error && fdblks_delta) {
895 mp->m_resblks += fdblks_delta;
896 mp->m_resblks_avail += fdblks_delta;
897 }
898
899 out:
900 if (outval) {
901 outval->resblks = mp->m_resblks;
902 outval->resblks_avail = mp->m_resblks_avail;
903 }
904
905 spin_unlock(&mp->m_sb_lock);
906 return error;
907 }
908
909 int
910 xfs_fs_goingdown(
911 xfs_mount_t *mp,
912 uint32_t inflags)
913 {
914 switch (inflags) {
915 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
916 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
917
918 if (sb && !IS_ERR(sb)) {
919 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
920 thaw_bdev(sb->s_bdev, sb);
921 }
922
923 break;
924 }
925 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
926 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
927 break;
928 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
929 xfs_force_shutdown(mp,
930 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
931 break;
932 default:
933 return -EINVAL;
934 }
935
936 return 0;
937 }
938
939 /*
940 * Force a shutdown of the filesystem instantly while keeping the filesystem
941 * consistent. We don't do an unmount here; just shutdown the shop, make sure
942 * that absolutely nothing persistent happens to this filesystem after this
943 * point.
944 */
945 void
946 xfs_do_force_shutdown(
947 xfs_mount_t *mp,
948 int flags,
949 char *fname,
950 int lnnum)
951 {
952 int logerror;
953
954 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
955
956 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
957 xfs_notice(mp,
958 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
959 __func__, flags, lnnum, fname, __return_address);
960 }
961 /*
962 * No need to duplicate efforts.
963 */
964 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
965 return;
966
967 /*
968 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
969 * queue up anybody new on the log reservations, and wakes up
970 * everybody who's sleeping on log reservations to tell them
971 * the bad news.
972 */
973 if (xfs_log_force_umount(mp, logerror))
974 return;
975
976 if (flags & SHUTDOWN_CORRUPT_INCORE) {
977 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
978 "Corruption of in-memory data detected. Shutting down filesystem");
979 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
980 xfs_stack_trace();
981 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
982 if (logerror) {
983 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
984 "Log I/O Error Detected. Shutting down filesystem");
985 } else if (flags & SHUTDOWN_DEVICE_REQ) {
986 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
987 "All device paths lost. Shutting down filesystem");
988 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
989 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
990 "I/O Error Detected. Shutting down filesystem");
991 }
992 }
993 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
994 xfs_alert(mp,
995 "Please umount the filesystem and rectify the problem(s)");
996 }
997 }
998
999 /*
1000 * Reserve free space for per-AG metadata.
1001 */
1002 int
1003 xfs_fs_reserve_ag_blocks(
1004 struct xfs_mount *mp)
1005 {
1006 xfs_agnumber_t agno;
1007 struct xfs_perag *pag;
1008 int error = 0;
1009 int err2;
1010
1011 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
1012 pag = xfs_perag_get(mp, agno);
1013 err2 = xfs_ag_resv_init(pag);
1014 xfs_perag_put(pag);
1015 if (err2 && !error)
1016 error = err2;
1017 }
1018
1019 if (error && error != -ENOSPC) {
1020 xfs_warn(mp,
1021 "Error %d reserving per-AG metadata reserve pool.", error);
1022 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1023 }
1024
1025 return error;
1026 }
1027
1028 /*
1029 * Free space reserved for per-AG metadata.
1030 */
1031 int
1032 xfs_fs_unreserve_ag_blocks(
1033 struct xfs_mount *mp)
1034 {
1035 xfs_agnumber_t agno;
1036 struct xfs_perag *pag;
1037 int error = 0;
1038 int err2;
1039
1040 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
1041 pag = xfs_perag_get(mp, agno);
1042 err2 = xfs_ag_resv_free(pag);
1043 xfs_perag_put(pag);
1044 if (err2 && !error)
1045 error = err2;
1046 }
1047
1048 if (error)
1049 xfs_warn(mp,
1050 "Error %d freeing per-AG metadata reserve pool.", error);
1051
1052 return error;
1053 }
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