1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * Copyright (c) 2018 Red Hat, Inc.
5 * All rights reserved.
6 */
7
8 #include "xfs.h"
9 #include "xfs_fs.h"
10 #include "xfs_shared.h"
11 #include "xfs_format.h"
12 #include "xfs_trans_resv.h"
13 #include "xfs_sb.h"
14 #include "xfs_mount.h"
15 #include "xfs_btree.h"
16 #include "xfs_alloc_btree.h"
17 #include "xfs_rmap_btree.h"
18 #include "xfs_alloc.h"
19 #include "xfs_ialloc.h"
20 #include "xfs_rmap.h"
21 #include "xfs_ag.h"
22
23 static struct xfs_buf *
xfs_get_aghdr_buf(struct xfs_mount * mp,xfs_daddr_t blkno,size_t numblks,int flags,const struct xfs_buf_ops * ops)24 xfs_get_aghdr_buf(
25 struct xfs_mount *mp,
26 xfs_daddr_t blkno,
27 size_t numblks,
28 int flags,
29 const struct xfs_buf_ops *ops)
30 {
31 struct xfs_buf *bp;
32
33 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
34 if (!bp)
35 return NULL;
36
37 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
38 bp->b_bn = blkno;
39 bp->b_maps[0].bm_bn = blkno;
40 bp->b_ops = ops;
41
42 return bp;
43 }
44
45 /*
46 * Generic btree root block init function
47 */
48 static void
xfs_btroot_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)49 xfs_btroot_init(
50 struct xfs_mount *mp,
51 struct xfs_buf *bp,
52 struct aghdr_init_data *id)
53 {
54 xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
55 }
56
57 /*
58 * Alloc btree root block init functions
59 */
60 static void
xfs_bnoroot_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)61 xfs_bnoroot_init(
62 struct xfs_mount *mp,
63 struct xfs_buf *bp,
64 struct aghdr_init_data *id)
65 {
66 struct xfs_alloc_rec *arec;
67
68 xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
69 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
70 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
71 arec->ar_blockcount = cpu_to_be32(id->agsize -
72 be32_to_cpu(arec->ar_startblock));
73 }
74
75 static void
xfs_cntroot_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)76 xfs_cntroot_init(
77 struct xfs_mount *mp,
78 struct xfs_buf *bp,
79 struct aghdr_init_data *id)
80 {
81 struct xfs_alloc_rec *arec;
82
83 xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
84 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
85 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
86 arec->ar_blockcount = cpu_to_be32(id->agsize -
87 be32_to_cpu(arec->ar_startblock));
88 }
89
90 /*
91 * Reverse map root block init
92 */
93 static void
xfs_rmaproot_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)94 xfs_rmaproot_init(
95 struct xfs_mount *mp,
96 struct xfs_buf *bp,
97 struct aghdr_init_data *id)
98 {
99 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
100 struct xfs_rmap_rec *rrec;
101
102 xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
103
104 /*
105 * mark the AG header regions as static metadata The BNO
106 * btree block is the first block after the headers, so
107 * it's location defines the size of region the static
108 * metadata consumes.
109 *
110 * Note: unlike mkfs, we never have to account for log
111 * space when growing the data regions
112 */
113 rrec = XFS_RMAP_REC_ADDR(block, 1);
114 rrec->rm_startblock = 0;
115 rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
116 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
117 rrec->rm_offset = 0;
118
119 /* account freespace btree root blocks */
120 rrec = XFS_RMAP_REC_ADDR(block, 2);
121 rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
122 rrec->rm_blockcount = cpu_to_be32(2);
123 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
124 rrec->rm_offset = 0;
125
126 /* account inode btree root blocks */
127 rrec = XFS_RMAP_REC_ADDR(block, 3);
128 rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
129 rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
130 XFS_IBT_BLOCK(mp));
131 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
132 rrec->rm_offset = 0;
133
134 /* account for rmap btree root */
135 rrec = XFS_RMAP_REC_ADDR(block, 4);
136 rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
137 rrec->rm_blockcount = cpu_to_be32(1);
138 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
139 rrec->rm_offset = 0;
140
141 /* account for refc btree root */
142 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
143 rrec = XFS_RMAP_REC_ADDR(block, 5);
144 rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp));
145 rrec->rm_blockcount = cpu_to_be32(1);
146 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
147 rrec->rm_offset = 0;
148 be16_add_cpu(&block->bb_numrecs, 1);
149 }
150 }
151
152 /*
153 * Initialise new secondary superblocks with the pre-grow geometry, but mark
154 * them as "in progress" so we know they haven't yet been activated. This will
155 * get cleared when the update with the new geometry information is done after
156 * changes to the primary are committed. This isn't strictly necessary, but we
157 * get it for free with the delayed buffer write lists and it means we can tell
158 * if a grow operation didn't complete properly after the fact.
159 */
160 static void
xfs_sbblock_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)161 xfs_sbblock_init(
162 struct xfs_mount *mp,
163 struct xfs_buf *bp,
164 struct aghdr_init_data *id)
165 {
166 struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp);
167
168 xfs_sb_to_disk(dsb, &mp->m_sb);
169 dsb->sb_inprogress = 1;
170 }
171
172 static void
xfs_agfblock_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)173 xfs_agfblock_init(
174 struct xfs_mount *mp,
175 struct xfs_buf *bp,
176 struct aghdr_init_data *id)
177 {
178 struct xfs_agf *agf = XFS_BUF_TO_AGF(bp);
179 xfs_extlen_t tmpsize;
180
181 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
182 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
183 agf->agf_seqno = cpu_to_be32(id->agno);
184 agf->agf_length = cpu_to_be32(id->agsize);
185 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
186 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
187 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
188 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
189 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
190 agf->agf_roots[XFS_BTNUM_RMAPi] =
191 cpu_to_be32(XFS_RMAP_BLOCK(mp));
192 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
193 agf->agf_rmap_blocks = cpu_to_be32(1);
194 }
195
196 agf->agf_flfirst = cpu_to_be32(1);
197 agf->agf_fllast = 0;
198 agf->agf_flcount = 0;
199 tmpsize = id->agsize - mp->m_ag_prealloc_blocks;
200 agf->agf_freeblks = cpu_to_be32(tmpsize);
201 agf->agf_longest = cpu_to_be32(tmpsize);
202 if (xfs_sb_version_hascrc(&mp->m_sb))
203 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
204 if (xfs_sb_version_hasreflink(&mp->m_sb)) {
205 agf->agf_refcount_root = cpu_to_be32(
206 xfs_refc_block(mp));
207 agf->agf_refcount_level = cpu_to_be32(1);
208 agf->agf_refcount_blocks = cpu_to_be32(1);
209 }
210 }
211
212 static void
xfs_agflblock_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)213 xfs_agflblock_init(
214 struct xfs_mount *mp,
215 struct xfs_buf *bp,
216 struct aghdr_init_data *id)
217 {
218 struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
219 __be32 *agfl_bno;
220 int bucket;
221
222 if (xfs_sb_version_hascrc(&mp->m_sb)) {
223 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
224 agfl->agfl_seqno = cpu_to_be32(id->agno);
225 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
226 }
227
228 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
229 for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
230 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
231 }
232
233 static void
xfs_agiblock_init(struct xfs_mount * mp,struct xfs_buf * bp,struct aghdr_init_data * id)234 xfs_agiblock_init(
235 struct xfs_mount *mp,
236 struct xfs_buf *bp,
237 struct aghdr_init_data *id)
238 {
239 struct xfs_agi *agi = XFS_BUF_TO_AGI(bp);
240 int bucket;
241
242 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
243 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
244 agi->agi_seqno = cpu_to_be32(id->agno);
245 agi->agi_length = cpu_to_be32(id->agsize);
246 agi->agi_count = 0;
247 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
248 agi->agi_level = cpu_to_be32(1);
249 agi->agi_freecount = 0;
250 agi->agi_newino = cpu_to_be32(NULLAGINO);
251 agi->agi_dirino = cpu_to_be32(NULLAGINO);
252 if (xfs_sb_version_hascrc(&mp->m_sb))
253 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
254 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
255 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
256 agi->agi_free_level = cpu_to_be32(1);
257 }
258 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
259 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
260 }
261
262 typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp,
263 struct aghdr_init_data *id);
264 static int
xfs_ag_init_hdr(struct xfs_mount * mp,struct aghdr_init_data * id,aghdr_init_work_f work,const struct xfs_buf_ops * ops)265 xfs_ag_init_hdr(
266 struct xfs_mount *mp,
267 struct aghdr_init_data *id,
268 aghdr_init_work_f work,
269 const struct xfs_buf_ops *ops)
270
271 {
272 struct xfs_buf *bp;
273
274 bp = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, 0, ops);
275 if (!bp)
276 return -ENOMEM;
277
278 (*work)(mp, bp, id);
279
280 xfs_buf_delwri_queue(bp, &id->buffer_list);
281 xfs_buf_relse(bp);
282 return 0;
283 }
284
285 struct xfs_aghdr_grow_data {
286 xfs_daddr_t daddr;
287 size_t numblks;
288 const struct xfs_buf_ops *ops;
289 aghdr_init_work_f work;
290 xfs_btnum_t type;
291 bool need_init;
292 };
293
294 /*
295 * Prepare new AG headers to be written to disk. We use uncached buffers here,
296 * as it is assumed these new AG headers are currently beyond the currently
297 * valid filesystem address space. Using cached buffers would trip over EOFS
298 * corruption detection alogrithms in the buffer cache lookup routines.
299 *
300 * This is a non-transactional function, but the prepared buffers are added to a
301 * delayed write buffer list supplied by the caller so they can submit them to
302 * disk and wait on them as required.
303 */
304 int
xfs_ag_init_headers(struct xfs_mount * mp,struct aghdr_init_data * id)305 xfs_ag_init_headers(
306 struct xfs_mount *mp,
307 struct aghdr_init_data *id)
308
309 {
310 struct xfs_aghdr_grow_data aghdr_data[] = {
311 { /* SB */
312 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR),
313 .numblks = XFS_FSS_TO_BB(mp, 1),
314 .ops = &xfs_sb_buf_ops,
315 .work = &xfs_sbblock_init,
316 .need_init = true
317 },
318 { /* AGF */
319 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)),
320 .numblks = XFS_FSS_TO_BB(mp, 1),
321 .ops = &xfs_agf_buf_ops,
322 .work = &xfs_agfblock_init,
323 .need_init = true
324 },
325 { /* AGFL */
326 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)),
327 .numblks = XFS_FSS_TO_BB(mp, 1),
328 .ops = &xfs_agfl_buf_ops,
329 .work = &xfs_agflblock_init,
330 .need_init = true
331 },
332 { /* AGI */
333 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)),
334 .numblks = XFS_FSS_TO_BB(mp, 1),
335 .ops = &xfs_agi_buf_ops,
336 .work = &xfs_agiblock_init,
337 .need_init = true
338 },
339 { /* BNO root block */
340 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
341 .numblks = BTOBB(mp->m_sb.sb_blocksize),
342 .ops = &xfs_allocbt_buf_ops,
343 .work = &xfs_bnoroot_init,
344 .need_init = true
345 },
346 { /* CNT root block */
347 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
348 .numblks = BTOBB(mp->m_sb.sb_blocksize),
349 .ops = &xfs_allocbt_buf_ops,
350 .work = &xfs_cntroot_init,
351 .need_init = true
352 },
353 { /* INO root block */
354 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)),
355 .numblks = BTOBB(mp->m_sb.sb_blocksize),
356 .ops = &xfs_inobt_buf_ops,
357 .work = &xfs_btroot_init,
358 .type = XFS_BTNUM_INO,
359 .need_init = true
360 },
361 { /* FINO root block */
362 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
363 .numblks = BTOBB(mp->m_sb.sb_blocksize),
364 .ops = &xfs_inobt_buf_ops,
365 .work = &xfs_btroot_init,
366 .type = XFS_BTNUM_FINO,
367 .need_init = xfs_sb_version_hasfinobt(&mp->m_sb)
368 },
369 { /* RMAP root block */
370 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)),
371 .numblks = BTOBB(mp->m_sb.sb_blocksize),
372 .ops = &xfs_rmapbt_buf_ops,
373 .work = &xfs_rmaproot_init,
374 .need_init = xfs_sb_version_hasrmapbt(&mp->m_sb)
375 },
376 { /* REFC root block */
377 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)),
378 .numblks = BTOBB(mp->m_sb.sb_blocksize),
379 .ops = &xfs_refcountbt_buf_ops,
380 .work = &xfs_btroot_init,
381 .type = XFS_BTNUM_REFC,
382 .need_init = xfs_sb_version_hasreflink(&mp->m_sb)
383 },
384 { /* NULL terminating block */
385 .daddr = XFS_BUF_DADDR_NULL,
386 }
387 };
388 struct xfs_aghdr_grow_data *dp;
389 int error = 0;
390
391 /* Account for AG free space in new AG */
392 id->nfree += id->agsize - mp->m_ag_prealloc_blocks;
393 for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) {
394 if (!dp->need_init)
395 continue;
396
397 id->daddr = dp->daddr;
398 id->numblks = dp->numblks;
399 id->type = dp->type;
400 error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops);
401 if (error)
402 break;
403 }
404 return error;
405 }
406
407 /*
408 * Extent the AG indicated by the @id by the length passed in
409 */
410 int
xfs_ag_extend_space(struct xfs_mount * mp,struct xfs_trans * tp,struct aghdr_init_data * id,xfs_extlen_t len)411 xfs_ag_extend_space(
412 struct xfs_mount *mp,
413 struct xfs_trans *tp,
414 struct aghdr_init_data *id,
415 xfs_extlen_t len)
416 {
417 struct xfs_owner_info oinfo;
418 struct xfs_buf *bp;
419 struct xfs_agi *agi;
420 struct xfs_agf *agf;
421 int error;
422
423 /*
424 * Change the agi length.
425 */
426 error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp);
427 if (error)
428 return error;
429
430 agi = XFS_BUF_TO_AGI(bp);
431 be32_add_cpu(&agi->agi_length, len);
432 ASSERT(id->agno == mp->m_sb.sb_agcount - 1 ||
433 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
434 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
435
436 /*
437 * Change agf length.
438 */
439 error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp);
440 if (error)
441 return error;
442
443 agf = XFS_BUF_TO_AGF(bp);
444 be32_add_cpu(&agf->agf_length, len);
445 ASSERT(agf->agf_length == agi->agi_length);
446 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
447
448 /*
449 * Free the new space.
450 *
451 * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
452 * this doesn't actually exist in the rmap btree.
453 */
454 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
455 error = xfs_rmap_free(tp, bp, id->agno,
456 be32_to_cpu(agf->agf_length) - len,
457 len, &oinfo);
458 if (error)
459 return error;
460
461 return xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno,
462 be32_to_cpu(agf->agf_length) - len),
463 len, &oinfo, XFS_AG_RESV_NONE);
464 }
465