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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
47 /*
48 * File system operations
49 */
50
51 int
52 xfs_fs_geometry(
53 xfs_mount_t *mp,
54 xfs_fsop_geom_t *geo,
55 int new_version)
56 {
57
58 memset(geo, 0, sizeof(*geo));
59
60 geo->blocksize = mp->m_sb.sb_blocksize;
61 geo->rtextsize = mp->m_sb.sb_rextsize;
62 geo->agblocks = mp->m_sb.sb_agblocks;
63 geo->agcount = mp->m_sb.sb_agcount;
64 geo->logblocks = mp->m_sb.sb_logblocks;
65 geo->sectsize = mp->m_sb.sb_sectsize;
66 geo->inodesize = mp->m_sb.sb_inodesize;
67 geo->imaxpct = mp->m_sb.sb_imax_pct;
68 geo->datablocks = mp->m_sb.sb_dblocks;
69 geo->rtblocks = mp->m_sb.sb_rblocks;
70 geo->rtextents = mp->m_sb.sb_rextents;
71 geo->logstart = mp->m_sb.sb_logstart;
72 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
73 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
74 if (new_version >= 2) {
75 geo->sunit = mp->m_sb.sb_unit;
76 geo->swidth = mp->m_sb.sb_width;
77 }
78 if (new_version >= 3) {
79 geo->version = XFS_FSOP_GEOM_VERSION;
80 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
81 XFS_FSOP_GEOM_FLAGS_DIRV2 |
82 (xfs_sb_version_hasattr(&mp->m_sb) ?
83 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
84 (xfs_sb_version_hasquota(&mp->m_sb) ?
85 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
86 (xfs_sb_version_hasalign(&mp->m_sb) ?
87 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
88 (xfs_sb_version_hasdalign(&mp->m_sb) ?
89 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
90 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
91 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
92 (xfs_sb_version_hassector(&mp->m_sb) ?
93 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
94 (xfs_sb_version_hasasciici(&mp->m_sb) ?
95 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
96 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
97 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
98 (xfs_sb_version_hasattr2(&mp->m_sb) ?
99 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
100 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
101 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
102 (xfs_sb_version_hascrc(&mp->m_sb) ?
103 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
104 (xfs_sb_version_hasftype(&mp->m_sb) ?
105 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
106 (xfs_sb_version_hasfinobt(&mp->m_sb) ?
107 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) |
108 (xfs_sb_version_hassparseinodes(&mp->m_sb) ?
109 XFS_FSOP_GEOM_FLAGS_SPINODES : 0) |
110 (xfs_sb_version_hasrmapbt(&mp->m_sb) ?
111 XFS_FSOP_GEOM_FLAGS_RMAPBT : 0);
112 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
113 mp->m_sb.sb_logsectsize : BBSIZE;
114 geo->rtsectsize = mp->m_sb.sb_blocksize;
115 geo->dirblocksize = mp->m_dir_geo->blksize;
116 }
117 if (new_version >= 4) {
118 geo->flags |=
119 (xfs_sb_version_haslogv2(&mp->m_sb) ?
120 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
121 geo->logsunit = mp->m_sb.sb_logsunit;
122 }
123 return 0;
124 }
125
126 static struct xfs_buf *
127 xfs_growfs_get_hdr_buf(
128 struct xfs_mount *mp,
129 xfs_daddr_t blkno,
130 size_t numblks,
131 int flags,
132 const struct xfs_buf_ops *ops)
133 {
134 struct xfs_buf *bp;
135
136 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
137 if (!bp)
138 return NULL;
139
140 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
141 bp->b_bn = blkno;
142 bp->b_maps[0].bm_bn = blkno;
143 bp->b_ops = ops;
144
145 return bp;
146 }
147
148 static int
149 xfs_growfs_data_private(
150 xfs_mount_t *mp, /* mount point for filesystem */
151 xfs_growfs_data_t *in) /* growfs data input struct */
152 {
153 xfs_agf_t *agf;
154 struct xfs_agfl *agfl;
155 xfs_agi_t *agi;
156 xfs_agnumber_t agno;
157 xfs_extlen_t agsize;
158 xfs_extlen_t tmpsize;
159 xfs_alloc_rec_t *arec;
160 xfs_buf_t *bp;
161 int bucket;
162 int dpct;
163 int error, saved_error = 0;
164 xfs_agnumber_t nagcount;
165 xfs_agnumber_t nagimax = 0;
166 xfs_rfsblock_t nb, nb_mod;
167 xfs_rfsblock_t new;
168 xfs_rfsblock_t nfree;
169 xfs_agnumber_t oagcount;
170 int pct;
171 xfs_trans_t *tp;
172
173 nb = in->newblocks;
174 pct = in->imaxpct;
175 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
176 return -EINVAL;
177 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
178 return error;
179 dpct = pct - mp->m_sb.sb_imax_pct;
180 error = xfs_buf_read_uncached(mp->m_ddev_targp,
181 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
182 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
183 if (error)
184 return error;
185 xfs_buf_relse(bp);
186
187 new = nb; /* use new as a temporary here */
188 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
189 nagcount = new + (nb_mod != 0);
190 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
191 nagcount--;
192 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
193 if (nb < mp->m_sb.sb_dblocks)
194 return -EINVAL;
195 }
196 new = nb - mp->m_sb.sb_dblocks;
197 oagcount = mp->m_sb.sb_agcount;
198
199 /* allocate the new per-ag structures */
200 if (nagcount > oagcount) {
201 error = xfs_initialize_perag(mp, nagcount, &nagimax);
202 if (error)
203 return error;
204 }
205
206 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
207 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
208 if (error)
209 return error;
210
211 /*
212 * Write new AG headers to disk. Non-transactional, but written
213 * synchronously so they are completed prior to the growfs transaction
214 * being logged.
215 */
216 nfree = 0;
217 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
218 __be32 *agfl_bno;
219
220 /*
221 * AG freespace header block
222 */
223 bp = xfs_growfs_get_hdr_buf(mp,
224 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
225 XFS_FSS_TO_BB(mp, 1), 0,
226 &xfs_agf_buf_ops);
227 if (!bp) {
228 error = -ENOMEM;
229 goto error0;
230 }
231
232 agf = XFS_BUF_TO_AGF(bp);
233 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
234 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
235 agf->agf_seqno = cpu_to_be32(agno);
236 if (agno == nagcount - 1)
237 agsize =
238 nb -
239 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
240 else
241 agsize = mp->m_sb.sb_agblocks;
242 agf->agf_length = cpu_to_be32(agsize);
243 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
244 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
245 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
246 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
247 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
248 agf->agf_roots[XFS_BTNUM_RMAPi] =
249 cpu_to_be32(XFS_RMAP_BLOCK(mp));
250 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
251 agf->agf_rmap_blocks = cpu_to_be32(1);
252 }
253
254 agf->agf_flfirst = cpu_to_be32(1);
255 agf->agf_fllast = 0;
256 agf->agf_flcount = 0;
257 tmpsize = agsize - mp->m_ag_prealloc_blocks;
258 agf->agf_freeblks = cpu_to_be32(tmpsize);
259 agf->agf_longest = cpu_to_be32(tmpsize);
260 if (xfs_sb_version_hascrc(&mp->m_sb))
261 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
262
263 error = xfs_bwrite(bp);
264 xfs_buf_relse(bp);
265 if (error)
266 goto error0;
267
268 /*
269 * AG freelist header block
270 */
271 bp = xfs_growfs_get_hdr_buf(mp,
272 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
273 XFS_FSS_TO_BB(mp, 1), 0,
274 &xfs_agfl_buf_ops);
275 if (!bp) {
276 error = -ENOMEM;
277 goto error0;
278 }
279
280 agfl = XFS_BUF_TO_AGFL(bp);
281 if (xfs_sb_version_hascrc(&mp->m_sb)) {
282 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
283 agfl->agfl_seqno = cpu_to_be32(agno);
284 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
285 }
286
287 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
288 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
289 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
290
291 error = xfs_bwrite(bp);
292 xfs_buf_relse(bp);
293 if (error)
294 goto error0;
295
296 /*
297 * AG inode header block
298 */
299 bp = xfs_growfs_get_hdr_buf(mp,
300 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
301 XFS_FSS_TO_BB(mp, 1), 0,
302 &xfs_agi_buf_ops);
303 if (!bp) {
304 error = -ENOMEM;
305 goto error0;
306 }
307
308 agi = XFS_BUF_TO_AGI(bp);
309 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
310 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
311 agi->agi_seqno = cpu_to_be32(agno);
312 agi->agi_length = cpu_to_be32(agsize);
313 agi->agi_count = 0;
314 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
315 agi->agi_level = cpu_to_be32(1);
316 agi->agi_freecount = 0;
317 agi->agi_newino = cpu_to_be32(NULLAGINO);
318 agi->agi_dirino = cpu_to_be32(NULLAGINO);
319 if (xfs_sb_version_hascrc(&mp->m_sb))
320 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
321 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
322 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
323 agi->agi_free_level = cpu_to_be32(1);
324 }
325 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
326 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
327
328 error = xfs_bwrite(bp);
329 xfs_buf_relse(bp);
330 if (error)
331 goto error0;
332
333 /*
334 * BNO btree root block
335 */
336 bp = xfs_growfs_get_hdr_buf(mp,
337 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
338 BTOBB(mp->m_sb.sb_blocksize), 0,
339 &xfs_allocbt_buf_ops);
340
341 if (!bp) {
342 error = -ENOMEM;
343 goto error0;
344 }
345
346 if (xfs_sb_version_hascrc(&mp->m_sb))
347 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
348 agno, XFS_BTREE_CRC_BLOCKS);
349 else
350 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
351 agno, 0);
352
353 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
354 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
355 arec->ar_blockcount = cpu_to_be32(
356 agsize - be32_to_cpu(arec->ar_startblock));
357
358 error = xfs_bwrite(bp);
359 xfs_buf_relse(bp);
360 if (error)
361 goto error0;
362
363 /*
364 * CNT btree root block
365 */
366 bp = xfs_growfs_get_hdr_buf(mp,
367 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
368 BTOBB(mp->m_sb.sb_blocksize), 0,
369 &xfs_allocbt_buf_ops);
370 if (!bp) {
371 error = -ENOMEM;
372 goto error0;
373 }
374
375 if (xfs_sb_version_hascrc(&mp->m_sb))
376 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
377 agno, XFS_BTREE_CRC_BLOCKS);
378 else
379 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
380 agno, 0);
381
382 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
383 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
384 arec->ar_blockcount = cpu_to_be32(
385 agsize - be32_to_cpu(arec->ar_startblock));
386 nfree += be32_to_cpu(arec->ar_blockcount);
387
388 error = xfs_bwrite(bp);
389 xfs_buf_relse(bp);
390 if (error)
391 goto error0;
392
393 /* RMAP btree root block */
394 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
395 struct xfs_rmap_rec *rrec;
396 struct xfs_btree_block *block;
397
398 bp = xfs_growfs_get_hdr_buf(mp,
399 XFS_AGB_TO_DADDR(mp, agno, XFS_RMAP_BLOCK(mp)),
400 BTOBB(mp->m_sb.sb_blocksize), 0,
401 &xfs_rmapbt_buf_ops);
402 if (!bp) {
403 error = -ENOMEM;
404 goto error0;
405 }
406
407 xfs_btree_init_block(mp, bp, XFS_RMAP_CRC_MAGIC, 0, 0,
408 agno, XFS_BTREE_CRC_BLOCKS);
409 block = XFS_BUF_TO_BLOCK(bp);
410
411
412 /*
413 * mark the AG header regions as static metadata The BNO
414 * btree block is the first block after the headers, so
415 * it's location defines the size of region the static
416 * metadata consumes.
417 *
418 * Note: unlike mkfs, we never have to account for log
419 * space when growing the data regions
420 */
421 rrec = XFS_RMAP_REC_ADDR(block, 1);
422 rrec->rm_startblock = 0;
423 rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
424 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
425 rrec->rm_offset = 0;
426 be16_add_cpu(&block->bb_numrecs, 1);
427
428 /* account freespace btree root blocks */
429 rrec = XFS_RMAP_REC_ADDR(block, 2);
430 rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
431 rrec->rm_blockcount = cpu_to_be32(2);
432 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
433 rrec->rm_offset = 0;
434 be16_add_cpu(&block->bb_numrecs, 1);
435
436 /* account inode btree root blocks */
437 rrec = XFS_RMAP_REC_ADDR(block, 3);
438 rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
439 rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
440 XFS_IBT_BLOCK(mp));
441 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
442 rrec->rm_offset = 0;
443 be16_add_cpu(&block->bb_numrecs, 1);
444
445 /* account for rmap btree root */
446 rrec = XFS_RMAP_REC_ADDR(block, 4);
447 rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
448 rrec->rm_blockcount = cpu_to_be32(1);
449 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
450 rrec->rm_offset = 0;
451 be16_add_cpu(&block->bb_numrecs, 1);
452
453 error = xfs_bwrite(bp);
454 xfs_buf_relse(bp);
455 if (error)
456 goto error0;
457 }
458
459 /*
460 * INO btree root block
461 */
462 bp = xfs_growfs_get_hdr_buf(mp,
463 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
464 BTOBB(mp->m_sb.sb_blocksize), 0,
465 &xfs_inobt_buf_ops);
466 if (!bp) {
467 error = -ENOMEM;
468 goto error0;
469 }
470
471 if (xfs_sb_version_hascrc(&mp->m_sb))
472 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
473 agno, XFS_BTREE_CRC_BLOCKS);
474 else
475 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
476 agno, 0);
477
478 error = xfs_bwrite(bp);
479 xfs_buf_relse(bp);
480 if (error)
481 goto error0;
482
483 /*
484 * FINO btree root block
485 */
486 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
487 bp = xfs_growfs_get_hdr_buf(mp,
488 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
489 BTOBB(mp->m_sb.sb_blocksize), 0,
490 &xfs_inobt_buf_ops);
491 if (!bp) {
492 error = -ENOMEM;
493 goto error0;
494 }
495
496 if (xfs_sb_version_hascrc(&mp->m_sb))
497 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
498 0, 0, agno,
499 XFS_BTREE_CRC_BLOCKS);
500 else
501 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
502 0, agno, 0);
503
504 error = xfs_bwrite(bp);
505 xfs_buf_relse(bp);
506 if (error)
507 goto error0;
508 }
509
510 }
511 xfs_trans_agblocks_delta(tp, nfree);
512 /*
513 * There are new blocks in the old last a.g.
514 */
515 if (new) {
516 struct xfs_owner_info oinfo;
517
518 /*
519 * Change the agi length.
520 */
521 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
522 if (error) {
523 goto error0;
524 }
525 ASSERT(bp);
526 agi = XFS_BUF_TO_AGI(bp);
527 be32_add_cpu(&agi->agi_length, new);
528 ASSERT(nagcount == oagcount ||
529 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
530 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
531 /*
532 * Change agf length.
533 */
534 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
535 if (error) {
536 goto error0;
537 }
538 ASSERT(bp);
539 agf = XFS_BUF_TO_AGF(bp);
540 be32_add_cpu(&agf->agf_length, new);
541 ASSERT(be32_to_cpu(agf->agf_length) ==
542 be32_to_cpu(agi->agi_length));
543
544 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
545
546 /*
547 * Free the new space.
548 *
549 * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
550 * this doesn't actually exist in the rmap btree.
551 */
552 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
553 error = xfs_free_extent(tp,
554 XFS_AGB_TO_FSB(mp, agno,
555 be32_to_cpu(agf->agf_length) - new),
556 new, &oinfo);
557 if (error)
558 goto error0;
559 }
560
561 /*
562 * Update changed superblock fields transactionally. These are not
563 * seen by the rest of the world until the transaction commit applies
564 * them atomically to the superblock.
565 */
566 if (nagcount > oagcount)
567 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
568 if (nb > mp->m_sb.sb_dblocks)
569 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
570 nb - mp->m_sb.sb_dblocks);
571 if (nfree)
572 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
573 if (dpct)
574 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
575 xfs_trans_set_sync(tp);
576 error = xfs_trans_commit(tp);
577 if (error)
578 return error;
579
580 /* New allocation groups fully initialized, so update mount struct */
581 if (nagimax)
582 mp->m_maxagi = nagimax;
583 if (mp->m_sb.sb_imax_pct) {
584 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
585 do_div(icount, 100);
586 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
587 } else
588 mp->m_maxicount = 0;
589 xfs_set_low_space_thresholds(mp);
590 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
591
592 /* update secondary superblocks. */
593 for (agno = 1; agno < nagcount; agno++) {
594 error = 0;
595 /*
596 * new secondary superblocks need to be zeroed, not read from
597 * disk as the contents of the new area we are growing into is
598 * completely unknown.
599 */
600 if (agno < oagcount) {
601 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
602 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
603 XFS_FSS_TO_BB(mp, 1), 0, &bp,
604 &xfs_sb_buf_ops);
605 } else {
606 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
607 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
608 XFS_FSS_TO_BB(mp, 1), 0);
609 if (bp) {
610 bp->b_ops = &xfs_sb_buf_ops;
611 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
612 } else
613 error = -ENOMEM;
614 }
615
616 /*
617 * If we get an error reading or writing alternate superblocks,
618 * continue. xfs_repair chooses the "best" superblock based
619 * on most matches; if we break early, we'll leave more
620 * superblocks un-updated than updated, and xfs_repair may
621 * pick them over the properly-updated primary.
622 */
623 if (error) {
624 xfs_warn(mp,
625 "error %d reading secondary superblock for ag %d",
626 error, agno);
627 saved_error = error;
628 continue;
629 }
630 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
631
632 error = xfs_bwrite(bp);
633 xfs_buf_relse(bp);
634 if (error) {
635 xfs_warn(mp,
636 "write error %d updating secondary superblock for ag %d",
637 error, agno);
638 saved_error = error;
639 continue;
640 }
641 }
642 return saved_error ? saved_error : error;
643
644 error0:
645 xfs_trans_cancel(tp);
646 return error;
647 }
648
649 static int
650 xfs_growfs_log_private(
651 xfs_mount_t *mp, /* mount point for filesystem */
652 xfs_growfs_log_t *in) /* growfs log input struct */
653 {
654 xfs_extlen_t nb;
655
656 nb = in->newblocks;
657 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
658 return -EINVAL;
659 if (nb == mp->m_sb.sb_logblocks &&
660 in->isint == (mp->m_sb.sb_logstart != 0))
661 return -EINVAL;
662 /*
663 * Moving the log is hard, need new interfaces to sync
664 * the log first, hold off all activity while moving it.
665 * Can have shorter or longer log in the same space,
666 * or transform internal to external log or vice versa.
667 */
668 return -ENOSYS;
669 }
670
671 /*
672 * protected versions of growfs function acquire and release locks on the mount
673 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
674 * XFS_IOC_FSGROWFSRT
675 */
676
677
678 int
679 xfs_growfs_data(
680 xfs_mount_t *mp,
681 xfs_growfs_data_t *in)
682 {
683 int error;
684
685 if (!capable(CAP_SYS_ADMIN))
686 return -EPERM;
687 if (!mutex_trylock(&mp->m_growlock))
688 return -EWOULDBLOCK;
689 error = xfs_growfs_data_private(mp, in);
690 /*
691 * Increment the generation unconditionally, the error could be from
692 * updating the secondary superblocks, in which case the new size
693 * is live already.
694 */
695 mp->m_generation++;
696 mutex_unlock(&mp->m_growlock);
697 return error;
698 }
699
700 int
701 xfs_growfs_log(
702 xfs_mount_t *mp,
703 xfs_growfs_log_t *in)
704 {
705 int error;
706
707 if (!capable(CAP_SYS_ADMIN))
708 return -EPERM;
709 if (!mutex_trylock(&mp->m_growlock))
710 return -EWOULDBLOCK;
711 error = xfs_growfs_log_private(mp, in);
712 mutex_unlock(&mp->m_growlock);
713 return error;
714 }
715
716 /*
717 * exported through ioctl XFS_IOC_FSCOUNTS
718 */
719
720 int
721 xfs_fs_counts(
722 xfs_mount_t *mp,
723 xfs_fsop_counts_t *cnt)
724 {
725 cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
726 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
727 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
728 mp->m_alloc_set_aside;
729
730 spin_lock(&mp->m_sb_lock);
731 cnt->freertx = mp->m_sb.sb_frextents;
732 spin_unlock(&mp->m_sb_lock);
733 return 0;
734 }
735
736 /*
737 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
738 *
739 * xfs_reserve_blocks is called to set m_resblks
740 * in the in-core mount table. The number of unused reserved blocks
741 * is kept in m_resblks_avail.
742 *
743 * Reserve the requested number of blocks if available. Otherwise return
744 * as many as possible to satisfy the request. The actual number
745 * reserved are returned in outval
746 *
747 * A null inval pointer indicates that only the current reserved blocks
748 * available should be returned no settings are changed.
749 */
750
751 int
752 xfs_reserve_blocks(
753 xfs_mount_t *mp,
754 __uint64_t *inval,
755 xfs_fsop_resblks_t *outval)
756 {
757 __int64_t lcounter, delta;
758 __int64_t fdblks_delta = 0;
759 __uint64_t request;
760 __int64_t free;
761 int error = 0;
762
763 /* If inval is null, report current values and return */
764 if (inval == (__uint64_t *)NULL) {
765 if (!outval)
766 return -EINVAL;
767 outval->resblks = mp->m_resblks;
768 outval->resblks_avail = mp->m_resblks_avail;
769 return 0;
770 }
771
772 request = *inval;
773
774 /*
775 * With per-cpu counters, this becomes an interesting problem. we need
776 * to work out if we are freeing or allocation blocks first, then we can
777 * do the modification as necessary.
778 *
779 * We do this under the m_sb_lock so that if we are near ENOSPC, we will
780 * hold out any changes while we work out what to do. This means that
781 * the amount of free space can change while we do this, so we need to
782 * retry if we end up trying to reserve more space than is available.
783 */
784 spin_lock(&mp->m_sb_lock);
785
786 /*
787 * If our previous reservation was larger than the current value,
788 * then move any unused blocks back to the free pool. Modify the resblks
789 * counters directly since we shouldn't have any problems unreserving
790 * space.
791 */
792 if (mp->m_resblks > request) {
793 lcounter = mp->m_resblks_avail - request;
794 if (lcounter > 0) { /* release unused blocks */
795 fdblks_delta = lcounter;
796 mp->m_resblks_avail -= lcounter;
797 }
798 mp->m_resblks = request;
799 if (fdblks_delta) {
800 spin_unlock(&mp->m_sb_lock);
801 error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
802 spin_lock(&mp->m_sb_lock);
803 }
804
805 goto out;
806 }
807
808 /*
809 * If the request is larger than the current reservation, reserve the
810 * blocks before we update the reserve counters. Sample m_fdblocks and
811 * perform a partial reservation if the request exceeds free space.
812 */
813 error = -ENOSPC;
814 do {
815 free = percpu_counter_sum(&mp->m_fdblocks) -
816 mp->m_alloc_set_aside;
817 if (!free)
818 break;
819
820 delta = request - mp->m_resblks;
821 lcounter = free - delta;
822 if (lcounter < 0)
823 /* We can't satisfy the request, just get what we can */
824 fdblks_delta = free;
825 else
826 fdblks_delta = delta;
827
828 /*
829 * We'll either succeed in getting space from the free block
830 * count or we'll get an ENOSPC. If we get a ENOSPC, it means
831 * things changed while we were calculating fdblks_delta and so
832 * we should try again to see if there is anything left to
833 * reserve.
834 *
835 * Don't set the reserved flag here - we don't want to reserve
836 * the extra reserve blocks from the reserve.....
837 */
838 spin_unlock(&mp->m_sb_lock);
839 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
840 spin_lock(&mp->m_sb_lock);
841 } while (error == -ENOSPC);
842
843 /*
844 * Update the reserve counters if blocks have been successfully
845 * allocated.
846 */
847 if (!error && fdblks_delta) {
848 mp->m_resblks += fdblks_delta;
849 mp->m_resblks_avail += fdblks_delta;
850 }
851
852 out:
853 if (outval) {
854 outval->resblks = mp->m_resblks;
855 outval->resblks_avail = mp->m_resblks_avail;
856 }
857
858 spin_unlock(&mp->m_sb_lock);
859 return error;
860 }
861
862 int
863 xfs_fs_goingdown(
864 xfs_mount_t *mp,
865 __uint32_t inflags)
866 {
867 switch (inflags) {
868 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
869 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
870
871 if (sb && !IS_ERR(sb)) {
872 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
873 thaw_bdev(sb->s_bdev, sb);
874 }
875
876 break;
877 }
878 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
879 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
880 break;
881 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
882 xfs_force_shutdown(mp,
883 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
884 break;
885 default:
886 return -EINVAL;
887 }
888
889 return 0;
890 }
891
892 /*
893 * Force a shutdown of the filesystem instantly while keeping the filesystem
894 * consistent. We don't do an unmount here; just shutdown the shop, make sure
895 * that absolutely nothing persistent happens to this filesystem after this
896 * point.
897 */
898 void
899 xfs_do_force_shutdown(
900 xfs_mount_t *mp,
901 int flags,
902 char *fname,
903 int lnnum)
904 {
905 int logerror;
906
907 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
908
909 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
910 xfs_notice(mp,
911 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
912 __func__, flags, lnnum, fname, __return_address);
913 }
914 /*
915 * No need to duplicate efforts.
916 */
917 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
918 return;
919
920 /*
921 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
922 * queue up anybody new on the log reservations, and wakes up
923 * everybody who's sleeping on log reservations to tell them
924 * the bad news.
925 */
926 if (xfs_log_force_umount(mp, logerror))
927 return;
928
929 if (flags & SHUTDOWN_CORRUPT_INCORE) {
930 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
931 "Corruption of in-memory data detected. Shutting down filesystem");
932 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
933 xfs_stack_trace();
934 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
935 if (logerror) {
936 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
937 "Log I/O Error Detected. Shutting down filesystem");
938 } else if (flags & SHUTDOWN_DEVICE_REQ) {
939 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
940 "All device paths lost. Shutting down filesystem");
941 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
942 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
943 "I/O Error Detected. Shutting down filesystem");
944 }
945 }
946 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
947 xfs_alert(mp,
948 "Please umount the filesystem and rectify the problem(s)");
949 }
950 }
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