mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / fs / xfs / libxfs / xfs_refcount_btree.c
blob3c59dd3d58d714dc3f5b586906c8cc63e0265822
1 /*
2 * Copyright (C) 2016 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it would be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
20 #include "xfs.h"
21 #include "xfs_fs.h"
22 #include "xfs_shared.h"
23 #include "xfs_format.h"
24 #include "xfs_log_format.h"
25 #include "xfs_trans_resv.h"
26 #include "xfs_sb.h"
27 #include "xfs_mount.h"
28 #include "xfs_btree.h"
29 #include "xfs_bmap.h"
30 #include "xfs_refcount_btree.h"
31 #include "xfs_alloc.h"
32 #include "xfs_error.h"
33 #include "xfs_trace.h"
34 #include "xfs_cksum.h"
35 #include "xfs_trans.h"
36 #include "xfs_bit.h"
37 #include "xfs_rmap.h"
39 static struct xfs_btree_cur *
40 xfs_refcountbt_dup_cursor(
41 struct xfs_btree_cur *cur)
43 return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp,
44 cur->bc_private.a.agbp, cur->bc_private.a.agno,
45 cur->bc_private.a.dfops);
48 STATIC void
49 xfs_refcountbt_set_root(
50 struct xfs_btree_cur *cur,
51 union xfs_btree_ptr *ptr,
52 int inc)
54 struct xfs_buf *agbp = cur->bc_private.a.agbp;
55 struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
56 xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
57 struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno);
59 ASSERT(ptr->s != 0);
61 agf->agf_refcount_root = ptr->s;
62 be32_add_cpu(&agf->agf_refcount_level, inc);
63 pag->pagf_refcount_level += inc;
64 xfs_perag_put(pag);
66 xfs_alloc_log_agf(cur->bc_tp, agbp,
67 XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL);
70 STATIC int
71 xfs_refcountbt_alloc_block(
72 struct xfs_btree_cur *cur,
73 union xfs_btree_ptr *start,
74 union xfs_btree_ptr *new,
75 int *stat)
77 struct xfs_buf *agbp = cur->bc_private.a.agbp;
78 struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
79 struct xfs_alloc_arg args; /* block allocation args */
80 int error; /* error return value */
82 XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
84 memset(&args, 0, sizeof(args));
85 args.tp = cur->bc_tp;
86 args.mp = cur->bc_mp;
87 args.type = XFS_ALLOCTYPE_NEAR_BNO;
88 args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_private.a.agno,
89 xfs_refc_block(args.mp));
90 args.firstblock = args.fsbno;
91 xfs_rmap_ag_owner(&args.oinfo, XFS_RMAP_OWN_REFC);
92 args.minlen = args.maxlen = args.prod = 1;
93 args.resv = XFS_AG_RESV_METADATA;
95 error = xfs_alloc_vextent(&args);
96 if (error)
97 goto out_error;
98 trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_private.a.agno,
99 args.agbno, 1);
100 if (args.fsbno == NULLFSBLOCK) {
101 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
102 *stat = 0;
103 return 0;
105 ASSERT(args.agno == cur->bc_private.a.agno);
106 ASSERT(args.len == 1);
108 new->s = cpu_to_be32(args.agbno);
109 be32_add_cpu(&agf->agf_refcount_blocks, 1);
110 xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
112 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
113 *stat = 1;
114 return 0;
116 out_error:
117 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
118 return error;
121 STATIC int
122 xfs_refcountbt_free_block(
123 struct xfs_btree_cur *cur,
124 struct xfs_buf *bp)
126 struct xfs_mount *mp = cur->bc_mp;
127 struct xfs_buf *agbp = cur->bc_private.a.agbp;
128 struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
129 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
130 struct xfs_owner_info oinfo;
131 int error;
133 trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_private.a.agno,
134 XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1);
135 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC);
136 be32_add_cpu(&agf->agf_refcount_blocks, -1);
137 xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
138 error = xfs_free_extent(cur->bc_tp, fsbno, 1, &oinfo,
139 XFS_AG_RESV_METADATA);
140 if (error)
141 return error;
143 return error;
146 STATIC int
147 xfs_refcountbt_get_minrecs(
148 struct xfs_btree_cur *cur,
149 int level)
151 return cur->bc_mp->m_refc_mnr[level != 0];
154 STATIC int
155 xfs_refcountbt_get_maxrecs(
156 struct xfs_btree_cur *cur,
157 int level)
159 return cur->bc_mp->m_refc_mxr[level != 0];
162 STATIC void
163 xfs_refcountbt_init_key_from_rec(
164 union xfs_btree_key *key,
165 union xfs_btree_rec *rec)
167 key->refc.rc_startblock = rec->refc.rc_startblock;
170 STATIC void
171 xfs_refcountbt_init_high_key_from_rec(
172 union xfs_btree_key *key,
173 union xfs_btree_rec *rec)
175 __u32 x;
177 x = be32_to_cpu(rec->refc.rc_startblock);
178 x += be32_to_cpu(rec->refc.rc_blockcount) - 1;
179 key->refc.rc_startblock = cpu_to_be32(x);
182 STATIC void
183 xfs_refcountbt_init_rec_from_cur(
184 struct xfs_btree_cur *cur,
185 union xfs_btree_rec *rec)
187 rec->refc.rc_startblock = cpu_to_be32(cur->bc_rec.rc.rc_startblock);
188 rec->refc.rc_blockcount = cpu_to_be32(cur->bc_rec.rc.rc_blockcount);
189 rec->refc.rc_refcount = cpu_to_be32(cur->bc_rec.rc.rc_refcount);
192 STATIC void
193 xfs_refcountbt_init_ptr_from_cur(
194 struct xfs_btree_cur *cur,
195 union xfs_btree_ptr *ptr)
197 struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
199 ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
200 ASSERT(agf->agf_refcount_root != 0);
202 ptr->s = agf->agf_refcount_root;
205 STATIC int64_t
206 xfs_refcountbt_key_diff(
207 struct xfs_btree_cur *cur,
208 union xfs_btree_key *key)
210 struct xfs_refcount_irec *rec = &cur->bc_rec.rc;
211 struct xfs_refcount_key *kp = &key->refc;
213 return (int64_t)be32_to_cpu(kp->rc_startblock) - rec->rc_startblock;
216 STATIC int64_t
217 xfs_refcountbt_diff_two_keys(
218 struct xfs_btree_cur *cur,
219 union xfs_btree_key *k1,
220 union xfs_btree_key *k2)
222 return (int64_t)be32_to_cpu(k1->refc.rc_startblock) -
223 be32_to_cpu(k2->refc.rc_startblock);
226 STATIC bool
227 xfs_refcountbt_verify(
228 struct xfs_buf *bp)
230 struct xfs_mount *mp = bp->b_target->bt_mount;
231 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
232 struct xfs_perag *pag = bp->b_pag;
233 unsigned int level;
235 if (block->bb_magic != cpu_to_be32(XFS_REFC_CRC_MAGIC))
236 return false;
238 if (!xfs_sb_version_hasreflink(&mp->m_sb))
239 return false;
240 if (!xfs_btree_sblock_v5hdr_verify(bp))
241 return false;
243 level = be16_to_cpu(block->bb_level);
244 if (pag && pag->pagf_init) {
245 if (level >= pag->pagf_refcount_level)
246 return false;
247 } else if (level >= mp->m_refc_maxlevels)
248 return false;
250 return xfs_btree_sblock_verify(bp, mp->m_refc_mxr[level != 0]);
253 STATIC void
254 xfs_refcountbt_read_verify(
255 struct xfs_buf *bp)
257 if (!xfs_btree_sblock_verify_crc(bp))
258 xfs_buf_ioerror(bp, -EFSBADCRC);
259 else if (!xfs_refcountbt_verify(bp))
260 xfs_buf_ioerror(bp, -EFSCORRUPTED);
262 if (bp->b_error) {
263 trace_xfs_btree_corrupt(bp, _RET_IP_);
264 xfs_verifier_error(bp);
268 STATIC void
269 xfs_refcountbt_write_verify(
270 struct xfs_buf *bp)
272 if (!xfs_refcountbt_verify(bp)) {
273 trace_xfs_btree_corrupt(bp, _RET_IP_);
274 xfs_buf_ioerror(bp, -EFSCORRUPTED);
275 xfs_verifier_error(bp);
276 return;
278 xfs_btree_sblock_calc_crc(bp);
282 const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
283 .name = "xfs_refcountbt",
284 .verify_read = xfs_refcountbt_read_verify,
285 .verify_write = xfs_refcountbt_write_verify,
288 STATIC int
289 xfs_refcountbt_keys_inorder(
290 struct xfs_btree_cur *cur,
291 union xfs_btree_key *k1,
292 union xfs_btree_key *k2)
294 return be32_to_cpu(k1->refc.rc_startblock) <
295 be32_to_cpu(k2->refc.rc_startblock);
298 STATIC int
299 xfs_refcountbt_recs_inorder(
300 struct xfs_btree_cur *cur,
301 union xfs_btree_rec *r1,
302 union xfs_btree_rec *r2)
304 return be32_to_cpu(r1->refc.rc_startblock) +
305 be32_to_cpu(r1->refc.rc_blockcount) <=
306 be32_to_cpu(r2->refc.rc_startblock);
309 static const struct xfs_btree_ops xfs_refcountbt_ops = {
310 .rec_len = sizeof(struct xfs_refcount_rec),
311 .key_len = sizeof(struct xfs_refcount_key),
313 .dup_cursor = xfs_refcountbt_dup_cursor,
314 .set_root = xfs_refcountbt_set_root,
315 .alloc_block = xfs_refcountbt_alloc_block,
316 .free_block = xfs_refcountbt_free_block,
317 .get_minrecs = xfs_refcountbt_get_minrecs,
318 .get_maxrecs = xfs_refcountbt_get_maxrecs,
319 .init_key_from_rec = xfs_refcountbt_init_key_from_rec,
320 .init_high_key_from_rec = xfs_refcountbt_init_high_key_from_rec,
321 .init_rec_from_cur = xfs_refcountbt_init_rec_from_cur,
322 .init_ptr_from_cur = xfs_refcountbt_init_ptr_from_cur,
323 .key_diff = xfs_refcountbt_key_diff,
324 .buf_ops = &xfs_refcountbt_buf_ops,
325 .diff_two_keys = xfs_refcountbt_diff_two_keys,
326 .keys_inorder = xfs_refcountbt_keys_inorder,
327 .recs_inorder = xfs_refcountbt_recs_inorder,
331 * Allocate a new refcount btree cursor.
333 struct xfs_btree_cur *
334 xfs_refcountbt_init_cursor(
335 struct xfs_mount *mp,
336 struct xfs_trans *tp,
337 struct xfs_buf *agbp,
338 xfs_agnumber_t agno,
339 struct xfs_defer_ops *dfops)
341 struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
342 struct xfs_btree_cur *cur;
344 ASSERT(agno != NULLAGNUMBER);
345 ASSERT(agno < mp->m_sb.sb_agcount);
346 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
348 cur->bc_tp = tp;
349 cur->bc_mp = mp;
350 cur->bc_btnum = XFS_BTNUM_REFC;
351 cur->bc_blocklog = mp->m_sb.sb_blocklog;
352 cur->bc_ops = &xfs_refcountbt_ops;
353 cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);
355 cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
357 cur->bc_private.a.agbp = agbp;
358 cur->bc_private.a.agno = agno;
359 cur->bc_private.a.dfops = dfops;
360 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
362 cur->bc_private.a.priv.refc.nr_ops = 0;
363 cur->bc_private.a.priv.refc.shape_changes = 0;
365 return cur;
369 * Calculate the number of records in a refcount btree block.
372 xfs_refcountbt_maxrecs(
373 struct xfs_mount *mp,
374 int blocklen,
375 bool leaf)
377 blocklen -= XFS_REFCOUNT_BLOCK_LEN;
379 if (leaf)
380 return blocklen / sizeof(struct xfs_refcount_rec);
381 return blocklen / (sizeof(struct xfs_refcount_key) +
382 sizeof(xfs_refcount_ptr_t));
385 /* Compute the maximum height of a refcount btree. */
386 void
387 xfs_refcountbt_compute_maxlevels(
388 struct xfs_mount *mp)
390 mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(mp,
391 mp->m_refc_mnr, mp->m_sb.sb_agblocks);
394 /* Calculate the refcount btree size for some records. */
395 xfs_extlen_t
396 xfs_refcountbt_calc_size(
397 struct xfs_mount *mp,
398 unsigned long long len)
400 return xfs_btree_calc_size(mp, mp->m_refc_mnr, len);
404 * Calculate the maximum refcount btree size.
406 xfs_extlen_t
407 xfs_refcountbt_max_size(
408 struct xfs_mount *mp,
409 xfs_agblock_t agblocks)
411 /* Bail out if we're uninitialized, which can happen in mkfs. */
412 if (mp->m_refc_mxr[0] == 0)
413 return 0;
415 return xfs_refcountbt_calc_size(mp, agblocks);
419 * Figure out how many blocks to reserve and how many are used by this btree.
422 xfs_refcountbt_calc_reserves(
423 struct xfs_mount *mp,
424 xfs_agnumber_t agno,
425 xfs_extlen_t *ask,
426 xfs_extlen_t *used)
428 struct xfs_buf *agbp;
429 struct xfs_agf *agf;
430 xfs_agblock_t agblocks;
431 xfs_extlen_t tree_len;
432 int error;
434 if (!xfs_sb_version_hasreflink(&mp->m_sb))
435 return 0;
438 error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
439 if (error)
440 return error;
442 agf = XFS_BUF_TO_AGF(agbp);
443 agblocks = be32_to_cpu(agf->agf_length);
444 tree_len = be32_to_cpu(agf->agf_refcount_blocks);
445 xfs_buf_relse(agbp);
447 *ask += xfs_refcountbt_max_size(mp, agblocks);
448 *used += tree_len;
450 return error;