blob: 795928d1a66d8885a733227e37e05f7361b0cdf1 [file] [log] [blame]
Dave Chinner0b61f8a2018-06-05 19:42:14 -07001// SPDX-License-Identifier: GPL-2.0+
Darrick J. Wong1946b912016-10-03 09:11:18 -07002/*
3 * Copyright (C) 2016 Oracle. All Rights Reserved.
Darrick J. Wong1946b912016-10-03 09:11:18 -07004 * Author: Darrick J. Wong <darrick.wong@oracle.com>
Darrick J. Wong1946b912016-10-03 09:11:18 -07005 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
Darrick J. Wong1946b912016-10-03 09:11:18 -070012#include "xfs_mount.h"
13#include "xfs_btree.h"
Darrick J. Wong56e98162020-03-11 11:09:06 -070014#include "xfs_btree_staging.h"
Darrick J. Wong1946b912016-10-03 09:11:18 -070015#include "xfs_refcount_btree.h"
Darrick J. Wong9a50ee42022-10-10 09:06:24 -070016#include "xfs_refcount.h"
Darrick J. Wong1946b912016-10-03 09:11:18 -070017#include "xfs_alloc.h"
18#include "xfs_error.h"
Christoph Hellwig7f477342024-02-22 12:39:47 -080019#include "xfs_health.h"
Darrick J. Wong1946b912016-10-03 09:11:18 -070020#include "xfs_trace.h"
Darrick J. Wong1946b912016-10-03 09:11:18 -070021#include "xfs_trans.h"
22#include "xfs_bit.h"
Darrick J. Wongbdf28632016-10-03 09:11:19 -070023#include "xfs_rmap.h"
Dave Chinner9bbafc712021-06-02 10:48:24 +100024#include "xfs_ag.h"
Darrick J. Wong1946b912016-10-03 09:11:18 -070025
Darrick J. Wonge7720afa2021-09-27 14:26:19 -070026static struct kmem_cache *xfs_refcountbt_cur_cache;
Darrick J. Wong9fa47bd2021-09-23 12:21:37 -070027
Darrick J. Wong1946b912016-10-03 09:11:18 -070028static struct xfs_btree_cur *
29xfs_refcountbt_dup_cursor(
30 struct xfs_btree_cur *cur)
31{
32 return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp,
Dave Chinnera81a0622021-06-02 10:48:24 +100033 cur->bc_ag.agbp, cur->bc_ag.pag);
Darrick J. Wong1946b912016-10-03 09:11:18 -070034}
35
Darrick J. Wongbdf28632016-10-03 09:11:19 -070036STATIC void
37xfs_refcountbt_set_root(
Darrick J. Wongb5a6e5f2021-08-12 09:49:03 -070038 struct xfs_btree_cur *cur,
39 const union xfs_btree_ptr *ptr,
40 int inc)
Darrick J. Wongbdf28632016-10-03 09:11:19 -070041{
Dave Chinner576af732020-03-10 17:51:15 -070042 struct xfs_buf *agbp = cur->bc_ag.agbp;
Christoph Hellwig9798f612020-03-10 08:57:29 -070043 struct xfs_agf *agf = agbp->b_addr;
Gao Xiang92a00542020-07-13 09:13:00 -070044 struct xfs_perag *pag = agbp->b_pag;
Darrick J. Wongbdf28632016-10-03 09:11:19 -070045
46 ASSERT(ptr->s != 0);
47
48 agf->agf_refcount_root = ptr->s;
49 be32_add_cpu(&agf->agf_refcount_level, inc);
50 pag->pagf_refcount_level += inc;
Darrick J. Wongbdf28632016-10-03 09:11:19 -070051
52 xfs_alloc_log_agf(cur->bc_tp, agbp,
53 XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL);
54}
55
56STATIC int
57xfs_refcountbt_alloc_block(
Darrick J. Wongdeb06b92021-08-12 09:53:27 -070058 struct xfs_btree_cur *cur,
59 const union xfs_btree_ptr *start,
60 union xfs_btree_ptr *new,
61 int *stat)
Darrick J. Wongbdf28632016-10-03 09:11:19 -070062{
Dave Chinner576af732020-03-10 17:51:15 -070063 struct xfs_buf *agbp = cur->bc_ag.agbp;
Christoph Hellwig9798f612020-03-10 08:57:29 -070064 struct xfs_agf *agf = agbp->b_addr;
Darrick J. Wongbdf28632016-10-03 09:11:19 -070065 struct xfs_alloc_arg args; /* block allocation args */
66 int error; /* error return value */
67
68 memset(&args, 0, sizeof(args));
69 args.tp = cur->bc_tp;
70 args.mp = cur->bc_mp;
Dave Chinner74c36a82023-02-13 09:14:53 +110071 args.pag = cur->bc_ag.pag;
Darrick J. Wong7280fed2018-12-12 08:46:23 -080072 args.oinfo = XFS_RMAP_OINFO_REFC;
Darrick J. Wongbdf28632016-10-03 09:11:19 -070073 args.minlen = args.maxlen = args.prod = 1;
Darrick J. Wong84d69612016-10-03 09:11:44 -070074 args.resv = XFS_AG_RESV_METADATA;
Darrick J. Wongbdf28632016-10-03 09:11:19 -070075
Dave Chinnerdb4710f2023-02-13 09:14:54 +110076 error = xfs_alloc_vextent_near_bno(&args,
77 XFS_AGB_TO_FSB(args.mp, args.pag->pag_agno,
78 xfs_refc_block(args.mp)));
Darrick J. Wongbdf28632016-10-03 09:11:19 -070079 if (error)
80 goto out_error;
Darrick J. Wongbdf28632016-10-03 09:11:19 -070081 if (args.fsbno == NULLFSBLOCK) {
Darrick J. Wongbdf28632016-10-03 09:11:19 -070082 *stat = 0;
83 return 0;
84 }
Dave Chinner50f02fe2021-06-02 10:48:24 +100085 ASSERT(args.agno == cur->bc_ag.pag->pag_agno);
Darrick J. Wongbdf28632016-10-03 09:11:19 -070086 ASSERT(args.len == 1);
87
88 new->s = cpu_to_be32(args.agbno);
89 be32_add_cpu(&agf->agf_refcount_blocks, 1);
90 xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
91
Darrick J. Wongbdf28632016-10-03 09:11:19 -070092 *stat = 1;
93 return 0;
94
95out_error:
Darrick J. Wongbdf28632016-10-03 09:11:19 -070096 return error;
97}
98
99STATIC int
100xfs_refcountbt_free_block(
101 struct xfs_btree_cur *cur,
102 struct xfs_buf *bp)
103{
104 struct xfs_mount *mp = cur->bc_mp;
Dave Chinner576af732020-03-10 17:51:15 -0700105 struct xfs_buf *agbp = cur->bc_ag.agbp;
Christoph Hellwig9798f612020-03-10 08:57:29 -0700106 struct xfs_agf *agf = agbp->b_addr;
Dave Chinner04fcad82021-08-18 18:46:57 -0700107 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, xfs_buf_daddr(bp));
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700108
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700109 be32_add_cpu(&agf->agf_refcount_blocks, -1);
110 xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
Dave Chinnerb742d7b42023-06-28 11:04:32 -0700111 return xfs_free_extent_later(cur->bc_tp, fsbno, 1,
Darrick J. Wong980faec2024-07-02 11:22:51 -0700112 &XFS_RMAP_OINFO_REFC, XFS_AG_RESV_METADATA, 0);
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700113}
114
115STATIC int
116xfs_refcountbt_get_minrecs(
117 struct xfs_btree_cur *cur,
118 int level)
119{
120 return cur->bc_mp->m_refc_mnr[level != 0];
121}
122
123STATIC int
124xfs_refcountbt_get_maxrecs(
125 struct xfs_btree_cur *cur,
126 int level)
127{
128 return cur->bc_mp->m_refc_mxr[level != 0];
129}
130
131STATIC void
132xfs_refcountbt_init_key_from_rec(
Darrick J. Wong23825cd2021-08-10 17:02:16 -0700133 union xfs_btree_key *key,
134 const union xfs_btree_rec *rec)
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700135{
136 key->refc.rc_startblock = rec->refc.rc_startblock;
137}
138
139STATIC void
140xfs_refcountbt_init_high_key_from_rec(
Darrick J. Wong23825cd2021-08-10 17:02:16 -0700141 union xfs_btree_key *key,
142 const union xfs_btree_rec *rec)
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700143{
Darrick J. Wong23825cd2021-08-10 17:02:16 -0700144 __u32 x;
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700145
146 x = be32_to_cpu(rec->refc.rc_startblock);
147 x += be32_to_cpu(rec->refc.rc_blockcount) - 1;
148 key->refc.rc_startblock = cpu_to_be32(x);
149}
150
151STATIC void
152xfs_refcountbt_init_rec_from_cur(
153 struct xfs_btree_cur *cur,
154 union xfs_btree_rec *rec)
155{
Darrick J. Wong9a50ee42022-10-10 09:06:24 -0700156 const struct xfs_refcount_irec *irec = &cur->bc_rec.rc;
157 uint32_t start;
158
159 start = xfs_refcount_encode_startblock(irec->rc_startblock,
160 irec->rc_domain);
161 rec->refc.rc_startblock = cpu_to_be32(start);
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700162 rec->refc.rc_blockcount = cpu_to_be32(cur->bc_rec.rc.rc_blockcount);
163 rec->refc.rc_refcount = cpu_to_be32(cur->bc_rec.rc.rc_refcount);
164}
165
166STATIC void
167xfs_refcountbt_init_ptr_from_cur(
168 struct xfs_btree_cur *cur,
169 union xfs_btree_ptr *ptr)
170{
Dave Chinner576af732020-03-10 17:51:15 -0700171 struct xfs_agf *agf = cur->bc_ag.agbp->b_addr;
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700172
Dave Chinner50f02fe2021-06-02 10:48:24 +1000173 ASSERT(cur->bc_ag.pag->pag_agno == be32_to_cpu(agf->agf_seqno));
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700174
175 ptr->s = agf->agf_refcount_root;
176}
177
Darrick J. Wongc8ce5402017-06-16 11:00:05 -0700178STATIC int64_t
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700179xfs_refcountbt_key_diff(
Darrick J. Wongd29d5572021-08-10 17:02:15 -0700180 struct xfs_btree_cur *cur,
181 const union xfs_btree_key *key)
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700182{
Darrick J. Wongd29d5572021-08-10 17:02:15 -0700183 const struct xfs_refcount_key *kp = &key->refc;
Darrick J. Wong9a50ee42022-10-10 09:06:24 -0700184 const struct xfs_refcount_irec *irec = &cur->bc_rec.rc;
185 uint32_t start;
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700186
Darrick J. Wong9a50ee42022-10-10 09:06:24 -0700187 start = xfs_refcount_encode_startblock(irec->rc_startblock,
188 irec->rc_domain);
189 return (int64_t)be32_to_cpu(kp->rc_startblock) - start;
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700190}
191
Darrick J. Wongc8ce5402017-06-16 11:00:05 -0700192STATIC int64_t
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700193xfs_refcountbt_diff_two_keys(
Darrick J. Wongd29d5572021-08-10 17:02:15 -0700194 struct xfs_btree_cur *cur,
195 const union xfs_btree_key *k1,
Darrick J. Wong4a200a02023-04-11 19:00:11 -0700196 const union xfs_btree_key *k2,
197 const union xfs_btree_key *mask)
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700198{
Darrick J. Wong4a200a02023-04-11 19:00:11 -0700199 ASSERT(!mask || mask->refc.rc_startblock);
200
Darrick J. Wongc8ce5402017-06-16 11:00:05 -0700201 return (int64_t)be32_to_cpu(k1->refc.rc_startblock) -
Darrick J. Wong4a200a02023-04-11 19:00:11 -0700202 be32_to_cpu(k2->refc.rc_startblock);
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700203}
204
Darrick J. Wonga6a781a2018-01-08 10:51:03 -0800205STATIC xfs_failaddr_t
Darrick J. Wong1946b912016-10-03 09:11:18 -0700206xfs_refcountbt_verify(
207 struct xfs_buf *bp)
208{
Christoph Hellwigdbd329f12019-06-28 19:27:29 -0700209 struct xfs_mount *mp = bp->b_mount;
Darrick J. Wong1946b912016-10-03 09:11:18 -0700210 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
211 struct xfs_perag *pag = bp->b_pag;
Darrick J. Wonga6a781a2018-01-08 10:51:03 -0800212 xfs_failaddr_t fa;
Darrick J. Wong1946b912016-10-03 09:11:18 -0700213 unsigned int level;
214
Brian Foster39708c22019-02-07 10:45:48 -0800215 if (!xfs_verify_magic(bp, block->bb_magic))
Darrick J. Wonga6a781a2018-01-08 10:51:03 -0800216 return __this_address;
Darrick J. Wong1946b912016-10-03 09:11:18 -0700217
Dave Chinner38c26bf2021-08-18 18:46:37 -0700218 if (!xfs_has_reflink(mp))
Darrick J. Wonga6a781a2018-01-08 10:51:03 -0800219 return __this_address;
Christoph Hellwig5ef819c2024-02-22 12:40:58 -0800220 fa = xfs_btree_agblock_v5hdr_verify(bp);
Darrick J. Wonga6a781a2018-01-08 10:51:03 -0800221 if (fa)
222 return fa;
Darrick J. Wong1946b912016-10-03 09:11:18 -0700223
224 level = be16_to_cpu(block->bb_level);
Dave Chinner7ac2ff82023-02-13 09:14:52 +1100225 if (pag && xfs_perag_initialised_agf(pag)) {
Darrick J. Wong9099cd382023-12-15 10:03:33 -0800226 unsigned int maxlevel = pag->pagf_refcount_level;
227
228#ifdef CONFIG_XFS_ONLINE_REPAIR
229 /*
230 * Online repair could be rewriting the refcount btree, so
231 * we'll validate against the larger of either tree while this
232 * is going on.
233 */
234 maxlevel = max_t(unsigned int, maxlevel,
235 pag->pagf_repair_refcount_level);
236#endif
237 if (level >= maxlevel)
Darrick J. Wonga6a781a2018-01-08 10:51:03 -0800238 return __this_address;
Darrick J. Wong1946b912016-10-03 09:11:18 -0700239 } else if (level >= mp->m_refc_maxlevels)
Darrick J. Wonga6a781a2018-01-08 10:51:03 -0800240 return __this_address;
Darrick J. Wong1946b912016-10-03 09:11:18 -0700241
Christoph Hellwig5ef819c2024-02-22 12:40:58 -0800242 return xfs_btree_agblock_verify(bp, mp->m_refc_mxr[level != 0]);
Darrick J. Wong1946b912016-10-03 09:11:18 -0700243}
244
245STATIC void
246xfs_refcountbt_read_verify(
247 struct xfs_buf *bp)
248{
Darrick J. Wongbc1a09b2018-01-08 10:51:03 -0800249 xfs_failaddr_t fa;
250
Christoph Hellwig5ef819c2024-02-22 12:40:58 -0800251 if (!xfs_btree_agblock_verify_crc(bp))
Darrick J. Wongbc1a09b2018-01-08 10:51:03 -0800252 xfs_verifier_error(bp, -EFSBADCRC, __this_address);
253 else {
254 fa = xfs_refcountbt_verify(bp);
255 if (fa)
256 xfs_verifier_error(bp, -EFSCORRUPTED, fa);
257 }
Darrick J. Wong1946b912016-10-03 09:11:18 -0700258
Darrick J. Wong31ca03c2018-01-08 10:51:02 -0800259 if (bp->b_error)
Darrick J. Wong1946b912016-10-03 09:11:18 -0700260 trace_xfs_btree_corrupt(bp, _RET_IP_);
Darrick J. Wong1946b912016-10-03 09:11:18 -0700261}
262
263STATIC void
264xfs_refcountbt_write_verify(
265 struct xfs_buf *bp)
266{
Darrick J. Wongbc1a09b2018-01-08 10:51:03 -0800267 xfs_failaddr_t fa;
268
269 fa = xfs_refcountbt_verify(bp);
270 if (fa) {
Darrick J. Wong1946b912016-10-03 09:11:18 -0700271 trace_xfs_btree_corrupt(bp, _RET_IP_);
Darrick J. Wongbc1a09b2018-01-08 10:51:03 -0800272 xfs_verifier_error(bp, -EFSCORRUPTED, fa);
Darrick J. Wong1946b912016-10-03 09:11:18 -0700273 return;
274 }
Christoph Hellwig5ef819c2024-02-22 12:40:58 -0800275 xfs_btree_agblock_calc_crc(bp);
Darrick J. Wong1946b912016-10-03 09:11:18 -0700276
277}
278
279const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
280 .name = "xfs_refcountbt",
Brian Foster39708c22019-02-07 10:45:48 -0800281 .magic = { 0, cpu_to_be32(XFS_REFC_CRC_MAGIC) },
Darrick J. Wong1946b912016-10-03 09:11:18 -0700282 .verify_read = xfs_refcountbt_read_verify,
283 .verify_write = xfs_refcountbt_write_verify,
Darrick J. Wongb5572592018-01-08 10:51:08 -0800284 .verify_struct = xfs_refcountbt_verify,
Darrick J. Wong1946b912016-10-03 09:11:18 -0700285};
286
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700287STATIC int
288xfs_refcountbt_keys_inorder(
Darrick J. Wong8e38dc82021-08-10 17:02:17 -0700289 struct xfs_btree_cur *cur,
290 const union xfs_btree_key *k1,
291 const union xfs_btree_key *k2)
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700292{
293 return be32_to_cpu(k1->refc.rc_startblock) <
294 be32_to_cpu(k2->refc.rc_startblock);
295}
296
297STATIC int
298xfs_refcountbt_recs_inorder(
Darrick J. Wong8e38dc82021-08-10 17:02:17 -0700299 struct xfs_btree_cur *cur,
300 const union xfs_btree_rec *r1,
301 const union xfs_btree_rec *r2)
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700302{
303 return be32_to_cpu(r1->refc.rc_startblock) +
304 be32_to_cpu(r1->refc.rc_blockcount) <=
305 be32_to_cpu(r2->refc.rc_startblock);
306}
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700307
Darrick J. Wong6abc7ae2023-04-11 19:00:10 -0700308STATIC enum xbtree_key_contig
309xfs_refcountbt_keys_contiguous(
310 struct xfs_btree_cur *cur,
311 const union xfs_btree_key *key1,
Darrick J. Wong4a200a02023-04-11 19:00:11 -0700312 const union xfs_btree_key *key2,
313 const union xfs_btree_key *mask)
Darrick J. Wong6abc7ae2023-04-11 19:00:10 -0700314{
Darrick J. Wong4a200a02023-04-11 19:00:11 -0700315 ASSERT(!mask || mask->refc.rc_startblock);
316
Darrick J. Wong6abc7ae2023-04-11 19:00:10 -0700317 return xbtree_key_contig(be32_to_cpu(key1->refc.rc_startblock),
318 be32_to_cpu(key2->refc.rc_startblock));
319}
320
Darrick J. Wongd8d6df42024-02-22 12:35:15 -0800321const struct xfs_btree_ops xfs_refcountbt_ops = {
Christoph Hellwig77953b92024-02-22 12:39:47 -0800322 .name = "refcount",
Christoph Hellwig4f0cd5a2024-02-22 12:36:17 -0800323 .type = XFS_BTREE_TYPE_AG,
324
Darrick J. Wong1946b912016-10-03 09:11:18 -0700325 .rec_len = sizeof(struct xfs_refcount_rec),
326 .key_len = sizeof(struct xfs_refcount_key),
Darrick J. Wong1a9d2622024-02-22 12:35:36 -0800327 .ptr_len = XFS_BTREE_SHORT_PTR_LEN,
Darrick J. Wong1946b912016-10-03 09:11:18 -0700328
Darrick J. Wong90cfae82024-02-22 12:35:20 -0800329 .lru_refs = XFS_REFC_BTREE_REF,
Christoph Hellwig07b7f2e2024-02-22 12:35:21 -0800330 .statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2),
Christoph Hellwig7f477342024-02-22 12:39:47 -0800331 .sick_mask = XFS_SICK_AG_REFCNTBT,
Darrick J. Wong90cfae82024-02-22 12:35:20 -0800332
Darrick J. Wong1946b912016-10-03 09:11:18 -0700333 .dup_cursor = xfs_refcountbt_dup_cursor,
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700334 .set_root = xfs_refcountbt_set_root,
335 .alloc_block = xfs_refcountbt_alloc_block,
336 .free_block = xfs_refcountbt_free_block,
337 .get_minrecs = xfs_refcountbt_get_minrecs,
338 .get_maxrecs = xfs_refcountbt_get_maxrecs,
339 .init_key_from_rec = xfs_refcountbt_init_key_from_rec,
340 .init_high_key_from_rec = xfs_refcountbt_init_high_key_from_rec,
341 .init_rec_from_cur = xfs_refcountbt_init_rec_from_cur,
342 .init_ptr_from_cur = xfs_refcountbt_init_ptr_from_cur,
343 .key_diff = xfs_refcountbt_key_diff,
Darrick J. Wong1946b912016-10-03 09:11:18 -0700344 .buf_ops = &xfs_refcountbt_buf_ops,
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700345 .diff_two_keys = xfs_refcountbt_diff_two_keys,
Darrick J. Wongbdf28632016-10-03 09:11:19 -0700346 .keys_inorder = xfs_refcountbt_keys_inorder,
347 .recs_inorder = xfs_refcountbt_recs_inorder,
Darrick J. Wong6abc7ae2023-04-11 19:00:10 -0700348 .keys_contiguous = xfs_refcountbt_keys_contiguous,
Darrick J. Wong1946b912016-10-03 09:11:18 -0700349};
350
351/*
Christoph Hellwig4f2dc692024-02-22 12:39:39 -0800352 * Create a new refcount btree cursor.
353 *
354 * For staging cursors tp and agbp are NULL.
Darrick J. Wong1946b912016-10-03 09:11:18 -0700355 */
Christoph Hellwig4f2dc692024-02-22 12:39:39 -0800356struct xfs_btree_cur *
357xfs_refcountbt_init_cursor(
Darrick J. Wong56e98162020-03-11 11:09:06 -0700358 struct xfs_mount *mp,
359 struct xfs_trans *tp,
Christoph Hellwig4f2dc692024-02-22 12:39:39 -0800360 struct xfs_buf *agbp,
Dave Chinnerbe9fb172021-06-02 10:48:24 +1000361 struct xfs_perag *pag)
Darrick J. Wong56e98162020-03-11 11:09:06 -0700362{
363 struct xfs_btree_cur *cur;
364
Dave Chinnera81a0622021-06-02 10:48:24 +1000365 ASSERT(pag->pag_agno < mp->m_sb.sb_agcount);
Darrick J. Wong56e98162020-03-11 11:09:06 -0700366
Christoph Hellwigec793e62024-02-22 12:40:51 -0800367 cur = xfs_btree_alloc_cursor(mp, tp, &xfs_refcountbt_ops,
368 mp->m_refc_maxlevels, xfs_refcountbt_cur_cache);
Darrick J. Wong9b2e5a22023-04-11 18:59:55 -0700369 cur->bc_ag.pag = xfs_perag_hold(pag);
Christoph Hellwig88ee2f42024-02-22 12:37:03 -0800370 cur->bc_refc.nr_ops = 0;
371 cur->bc_refc.shape_changes = 0;
Dave Chinner576af732020-03-10 17:51:15 -0700372 cur->bc_ag.agbp = agbp;
Christoph Hellwig4f2dc692024-02-22 12:39:39 -0800373 if (agbp) {
374 struct xfs_agf *agf = agbp->b_addr;
375
376 cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
377 }
Darrick J. Wong1946b912016-10-03 09:11:18 -0700378 return cur;
379}
380
Darrick J. Wong56e98162020-03-11 11:09:06 -0700381/*
382 * Swap in the new btree root. Once we pass this point the newly rebuilt btree
383 * is in place and we have to kill off all the old btree blocks.
384 */
385void
386xfs_refcountbt_commit_staged_btree(
387 struct xfs_btree_cur *cur,
388 struct xfs_trans *tp,
389 struct xfs_buf *agbp)
390{
391 struct xfs_agf *agf = agbp->b_addr;
392 struct xbtree_afakeroot *afake = cur->bc_ag.afake;
393
394 ASSERT(cur->bc_flags & XFS_BTREE_STAGING);
395
396 agf->agf_refcount_root = cpu_to_be32(afake->af_root);
397 agf->agf_refcount_level = cpu_to_be32(afake->af_levels);
398 agf->agf_refcount_blocks = cpu_to_be32(afake->af_blocks);
399 xfs_alloc_log_agf(tp, agbp, XFS_AGF_REFCOUNT_BLOCKS |
400 XFS_AGF_REFCOUNT_ROOT |
401 XFS_AGF_REFCOUNT_LEVEL);
Christoph Hellwig2b9e7f22024-02-22 12:37:35 -0800402 xfs_btree_commit_afakeroot(cur, tp, agbp);
Darrick J. Wong56e98162020-03-11 11:09:06 -0700403}
404
Darrick J. Wong0ed5f732021-09-23 10:32:06 -0700405/* Calculate number of records in a refcount btree block. */
406static inline unsigned int
407xfs_refcountbt_block_maxrecs(
408 unsigned int blocklen,
409 bool leaf)
410{
411 if (leaf)
412 return blocklen / sizeof(struct xfs_refcount_rec);
413 return blocklen / (sizeof(struct xfs_refcount_key) +
414 sizeof(xfs_refcount_ptr_t));
415}
416
Darrick J. Wong1946b912016-10-03 09:11:18 -0700417/*
418 * Calculate the number of records in a refcount btree block.
419 */
Darrick J. Wong411a7122024-08-30 15:37:21 -0700420unsigned int
Darrick J. Wong1946b912016-10-03 09:11:18 -0700421xfs_refcountbt_maxrecs(
Darrick J. Wong411a7122024-08-30 15:37:21 -0700422 struct xfs_mount *mp,
423 unsigned int blocklen,
Darrick J. Wong1946b912016-10-03 09:11:18 -0700424 bool leaf)
425{
426 blocklen -= XFS_REFCOUNT_BLOCK_LEN;
Darrick J. Wong0ed5f732021-09-23 10:32:06 -0700427 return xfs_refcountbt_block_maxrecs(blocklen, leaf);
428}
Darrick J. Wong1946b912016-10-03 09:11:18 -0700429
Darrick J. Wong0ed5f732021-09-23 10:32:06 -0700430/* Compute the max possible height of the maximally sized refcount btree. */
431unsigned int
432xfs_refcountbt_maxlevels_ondisk(void)
433{
434 unsigned int minrecs[2];
435 unsigned int blocklen;
436
437 blocklen = XFS_MIN_CRC_BLOCKSIZE - XFS_BTREE_SBLOCK_CRC_LEN;
438
439 minrecs[0] = xfs_refcountbt_block_maxrecs(blocklen, true) / 2;
440 minrecs[1] = xfs_refcountbt_block_maxrecs(blocklen, false) / 2;
441
442 return xfs_btree_compute_maxlevels(minrecs, XFS_MAX_CRC_AG_BLOCKS);
Darrick J. Wong1946b912016-10-03 09:11:18 -0700443}
444
445/* Compute the maximum height of a refcount btree. */
446void
447xfs_refcountbt_compute_maxlevels(
448 struct xfs_mount *mp)
449{
Darrick J. Wong0ed5f732021-09-23 10:32:06 -0700450 if (!xfs_has_reflink(mp)) {
451 mp->m_refc_maxlevels = 0;
452 return;
453 }
454
Eric Sandeena1f69412018-04-06 10:09:42 -0700455 mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(
Darrick J. Wong1946b912016-10-03 09:11:18 -0700456 mp->m_refc_mnr, mp->m_sb.sb_agblocks);
Darrick J. Wong0ed5f732021-09-23 10:32:06 -0700457 ASSERT(mp->m_refc_maxlevels <= xfs_refcountbt_maxlevels_ondisk());
Darrick J. Wong1946b912016-10-03 09:11:18 -0700458}
Darrick J. Wong84d69612016-10-03 09:11:44 -0700459
460/* Calculate the refcount btree size for some records. */
461xfs_extlen_t
462xfs_refcountbt_calc_size(
463 struct xfs_mount *mp,
464 unsigned long long len)
465{
Eric Sandeena1f69412018-04-06 10:09:42 -0700466 return xfs_btree_calc_size(mp->m_refc_mnr, len);
Darrick J. Wong84d69612016-10-03 09:11:44 -0700467}
468
469/*
470 * Calculate the maximum refcount btree size.
471 */
472xfs_extlen_t
473xfs_refcountbt_max_size(
Darrick J. Wong20e73b02017-01-03 18:39:33 -0800474 struct xfs_mount *mp,
475 xfs_agblock_t agblocks)
Darrick J. Wong84d69612016-10-03 09:11:44 -0700476{
477 /* Bail out if we're uninitialized, which can happen in mkfs. */
478 if (mp->m_refc_mxr[0] == 0)
479 return 0;
480
Darrick J. Wong20e73b02017-01-03 18:39:33 -0800481 return xfs_refcountbt_calc_size(mp, agblocks);
Darrick J. Wong84d69612016-10-03 09:11:44 -0700482}
483
484/*
485 * Figure out how many blocks to reserve and how many are used by this btree.
486 */
487int
488xfs_refcountbt_calc_reserves(
489 struct xfs_mount *mp,
Darrick J. Wongebcbef32018-07-29 22:37:08 -0700490 struct xfs_trans *tp,
Dave Chinner30933122021-06-02 10:48:24 +1000491 struct xfs_perag *pag,
Darrick J. Wong84d69612016-10-03 09:11:44 -0700492 xfs_extlen_t *ask,
493 xfs_extlen_t *used)
494{
495 struct xfs_buf *agbp;
496 struct xfs_agf *agf;
Darrick J. Wong20e73b02017-01-03 18:39:33 -0800497 xfs_agblock_t agblocks;
Darrick J. Wong84d69612016-10-03 09:11:44 -0700498 xfs_extlen_t tree_len;
499 int error;
500
Dave Chinner38c26bf2021-08-18 18:46:37 -0700501 if (!xfs_has_reflink(mp))
Darrick J. Wong84d69612016-10-03 09:11:44 -0700502 return 0;
503
Dave Chinner08d3e842022-07-07 19:07:40 +1000504 error = xfs_alloc_read_agf(pag, tp, 0, &agbp);
Darrick J. Wong84d69612016-10-03 09:11:44 -0700505 if (error)
506 return error;
507
Christoph Hellwig9798f612020-03-10 08:57:29 -0700508 agf = agbp->b_addr;
Darrick J. Wong20e73b02017-01-03 18:39:33 -0800509 agblocks = be32_to_cpu(agf->agf_length);
Darrick J. Wong84d69612016-10-03 09:11:44 -0700510 tree_len = be32_to_cpu(agf->agf_refcount_blocks);
Darrick J. Wongebcbef32018-07-29 22:37:08 -0700511 xfs_trans_brelse(tp, agbp);
Darrick J. Wong84d69612016-10-03 09:11:44 -0700512
Darrick J. Wong5cd213b2019-05-20 11:25:39 -0700513 /*
514 * The log is permanently allocated, so the space it occupies will
515 * never be available for the kinds of things that would require btree
516 * expansion. We therefore can pretend the space isn't there.
517 */
Dave Chinner36029de2022-07-07 19:13:21 +1000518 if (xfs_ag_contains_log(mp, pag->pag_agno))
Darrick J. Wong5cd213b2019-05-20 11:25:39 -0700519 agblocks -= mp->m_sb.sb_logblocks;
520
Darrick J. Wong20e73b02017-01-03 18:39:33 -0800521 *ask += xfs_refcountbt_max_size(mp, agblocks);
Darrick J. Wong84d69612016-10-03 09:11:44 -0700522 *used += tree_len;
523
524 return error;
525}
Darrick J. Wong9fa47bd2021-09-23 12:21:37 -0700526
527int __init
528xfs_refcountbt_init_cur_cache(void)
529{
530 xfs_refcountbt_cur_cache = kmem_cache_create("xfs_refcbt_cur",
531 xfs_btree_cur_sizeof(xfs_refcountbt_maxlevels_ondisk()),
532 0, 0, NULL);
533
534 if (!xfs_refcountbt_cur_cache)
535 return -ENOMEM;
536 return 0;
537}
538
539void
540xfs_refcountbt_destroy_cur_cache(void)
541{
542 kmem_cache_destroy(xfs_refcountbt_cur_cache);
543 xfs_refcountbt_cur_cache = NULL;
544}