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2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390

 kernel/fs/xfs/libxfs/xfs_refcount_btree.c
..
..
@@ -12,12 +12,11 @@
12
12
 #include "xfs_sb.h"
13
13
 #include "xfs_mount.h"
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14
 #include "xfs_btree.h"
15
-#include "xfs_bmap.h"
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+#include "xfs_btree_staging.h"
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 #include "xfs_refcount_btree.h"
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 #include "xfs_alloc.h"
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 #include "xfs_error.h"
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 #include "xfs_trace.h"
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-#include "xfs_cksum.h"
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 #include "xfs_trans.h"
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 #include "xfs_bit.h"
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 #include "xfs_rmap.h"
..
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@@ -27,7 +26,7 @@
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 	struct xfs_btree_cur	*cur)
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 {
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 	return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp,
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-			cur->bc_private.a.agbp, cur->bc_private.a.agno);
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+			cur->bc_ag.agbp, cur->bc_ag.agno);
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30
 }
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31
 
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 STATIC void
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@@ -36,17 +35,15 @@
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 	union xfs_btree_ptr	*ptr,
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 	int			inc)
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 {
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-	struct xfs_buf		*agbp = cur->bc_private.a.agbp;
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-	struct xfs_agf		*agf = XFS_BUF_TO_AGF(agbp);
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-	xfs_agnumber_t		seqno = be32_to_cpu(agf->agf_seqno);
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-	struct xfs_perag	*pag = xfs_perag_get(cur->bc_mp, seqno);
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+	struct xfs_buf		*agbp = cur->bc_ag.agbp;
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+	struct xfs_agf		*agf = agbp->b_addr;
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+	struct xfs_perag	*pag = agbp->b_pag;
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41
 
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 	ASSERT(ptr->s != 0);
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43
 
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 	agf->agf_refcount_root = ptr->s;
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 	be32_add_cpu(&agf->agf_refcount_level, inc);
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 	pag->pagf_refcount_level += inc;
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-	xfs_perag_put(pag);
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47
 
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 	xfs_alloc_log_agf(cur->bc_tp, agbp,
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 			XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL);
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@@ -59,8 +56,8 @@
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 	union xfs_btree_ptr	*new,
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57
 	int			*stat)
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 {
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-	struct xfs_buf		*agbp = cur->bc_private.a.agbp;
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-	struct xfs_agf		*agf = XFS_BUF_TO_AGF(agbp);
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+	struct xfs_buf		*agbp = cur->bc_ag.agbp;
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+	struct xfs_agf		*agf = agbp->b_addr;
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 	struct xfs_alloc_arg	args;		/* block allocation args */
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 	int			error;		/* error return value */
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63
 
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@@ -68,22 +65,22 @@
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 	args.tp = cur->bc_tp;
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 	args.mp = cur->bc_mp;
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 	args.type = XFS_ALLOCTYPE_NEAR_BNO;
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-	args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_private.a.agno,
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+	args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_ag.agno,
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 			xfs_refc_block(args.mp));
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-	xfs_rmap_ag_owner(&args.oinfo, XFS_RMAP_OWN_REFC);
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+	args.oinfo = XFS_RMAP_OINFO_REFC;
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 	args.minlen = args.maxlen = args.prod = 1;
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 	args.resv = XFS_AG_RESV_METADATA;
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73
 
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 	error = xfs_alloc_vextent(&args);
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 	if (error)
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 		goto out_error;
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-	trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_private.a.agno,
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+	trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_ag.agno,
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 			args.agbno, 1);
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 	if (args.fsbno == NULLFSBLOCK) {
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 		*stat = 0;
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 		return 0;
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 	}
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-	ASSERT(args.agno == cur->bc_private.a.agno);
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+	ASSERT(args.agno == cur->bc_ag.agno);
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 	ASSERT(args.len == 1);
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85
 
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 	new->s = cpu_to_be32(args.agbno);
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@@ -103,18 +100,16 @@
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 	struct xfs_buf		*bp)
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 {
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 	struct xfs_mount	*mp = cur->bc_mp;
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-	struct xfs_buf		*agbp = cur->bc_private.a.agbp;
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-	struct xfs_agf		*agf = XFS_BUF_TO_AGF(agbp);
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+	struct xfs_buf		*agbp = cur->bc_ag.agbp;
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+	struct xfs_agf		*agf = agbp->b_addr;
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 	xfs_fsblock_t		fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
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-	struct xfs_owner_info	oinfo;
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 	int			error;
111
107
 
112
-	trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_private.a.agno,
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+	trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_ag.agno,
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 			XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1);
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-	xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC);
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 	be32_add_cpu(&agf->agf_refcount_blocks, -1);
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 	xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
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-	error = xfs_free_extent(cur->bc_tp, fsbno, 1, &oinfo,
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+	error = xfs_free_extent(cur->bc_tp, fsbno, 1, &XFS_RMAP_OINFO_REFC,
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 			XFS_AG_RESV_METADATA);
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 	if (error)
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 		return error;
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@@ -173,9 +168,9 @@
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 	struct xfs_btree_cur	*cur,
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 	union xfs_btree_ptr	*ptr)
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 {
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-	struct xfs_agf		*agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
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+	struct xfs_agf		*agf = cur->bc_ag.agbp->b_addr;
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172
 
178
-	ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
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+	ASSERT(cur->bc_ag.agno == be32_to_cpu(agf->agf_seqno));
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174
 
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 	ptr->s = agf->agf_refcount_root;
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176
 }
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@@ -205,13 +200,13 @@
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 xfs_refcountbt_verify(
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 	struct xfs_buf		*bp)
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 {
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-	struct xfs_mount	*mp = bp->b_target->bt_mount;
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+	struct xfs_mount	*mp = bp->b_mount;
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 	struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
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 	struct xfs_perag	*pag = bp->b_pag;
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 	xfs_failaddr_t		fa;
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207
 	unsigned int		level;
213
208
 
214
-	if (block->bb_magic != cpu_to_be32(XFS_REFC_CRC_MAGIC))
209
+	if (!xfs_verify_magic(bp, block->bb_magic))
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210
 		return __this_address;
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211
 
217
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 	if (!xfs_sb_version_hasreflink(&mp->m_sb))
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@@ -266,6 +261,7 @@
266
261
 
267
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 const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
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 	.name			= "xfs_refcountbt",
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+	.magic			= { 0, cpu_to_be32(XFS_REFC_CRC_MAGIC) },
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 	.verify_read		= xfs_refcountbt_read_verify,
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 	.verify_write		= xfs_refcountbt_write_verify,
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 	.verify_struct		= xfs_refcountbt_verify,
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@@ -314,8 +310,36 @@
314
310
 };
315
311
 
316
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 /*
317
- * Allocate a new refcount btree cursor.
313
+ * Initialize a new refcount btree cursor.
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314
  */
315
+static struct xfs_btree_cur *
316
+xfs_refcountbt_init_common(
317
+	struct xfs_mount	*mp,
318
+	struct xfs_trans	*tp,
319
+	xfs_agnumber_t		agno)
320
+{
321
+	struct xfs_btree_cur	*cur;
322
+
323
+	ASSERT(agno != NULLAGNUMBER);
324
+	ASSERT(agno < mp->m_sb.sb_agcount);
325
+
326
+	cur = kmem_cache_zalloc(xfs_btree_cur_zone, GFP_NOFS | __GFP_NOFAIL);
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+	cur->bc_tp = tp;
328
+	cur->bc_mp = mp;
329
+	cur->bc_btnum = XFS_BTNUM_REFC;
330
+	cur->bc_blocklog = mp->m_sb.sb_blocklog;
331
+	cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);
332
+
333
+	cur->bc_ag.agno = agno;
334
+	cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
335
+
336
+	cur->bc_ag.refc.nr_ops = 0;
337
+	cur->bc_ag.refc.shape_changes = 0;
338
+	cur->bc_ops = &xfs_refcountbt_ops;
339
+	return cur;
340
+}
341
+
342
+/* Create a btree cursor. */
319
343
 struct xfs_btree_cur *
320
344
 xfs_refcountbt_init_cursor(
321
345
 	struct xfs_mount	*mp,
..
..
@@ -323,30 +347,51 @@
323
347
 	struct xfs_buf		*agbp,
324
348
 	xfs_agnumber_t		agno)
325
349
 {
326
-	struct xfs_agf		*agf = XFS_BUF_TO_AGF(agbp);
350
+	struct xfs_agf		*agf = agbp->b_addr;
327
351
 	struct xfs_btree_cur	*cur;
328
352
 
329
-	ASSERT(agno != NULLAGNUMBER);
330
-	ASSERT(agno < mp->m_sb.sb_agcount);
331
-	cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
332
-
333
-	cur->bc_tp = tp;
334
-	cur->bc_mp = mp;
335
-	cur->bc_btnum = XFS_BTNUM_REFC;
336
-	cur->bc_blocklog = mp->m_sb.sb_blocklog;
337
-	cur->bc_ops = &xfs_refcountbt_ops;
338
-	cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);
339
-
353
+	cur = xfs_refcountbt_init_common(mp, tp, agno);
340
354
 	cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
341
-
342
-	cur->bc_private.a.agbp = agbp;
343
-	cur->bc_private.a.agno = agno;
344
-	cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
345
-
346
-	cur->bc_private.a.priv.refc.nr_ops = 0;
347
-	cur->bc_private.a.priv.refc.shape_changes = 0;
348
-
355
+	cur->bc_ag.agbp = agbp;
349
356
 	return cur;
357
+}
358
+
359
+/* Create a btree cursor with a fake root for staging. */
360
+struct xfs_btree_cur *
361
+xfs_refcountbt_stage_cursor(
362
+	struct xfs_mount	*mp,
363
+	struct xbtree_afakeroot	*afake,
364
+	xfs_agnumber_t		agno)
365
+{
366
+	struct xfs_btree_cur	*cur;
367
+
368
+	cur = xfs_refcountbt_init_common(mp, NULL, agno);
369
+	xfs_btree_stage_afakeroot(cur, afake);
370
+	return cur;
371
+}
372
+
373
+/*
374
+ * Swap in the new btree root.  Once we pass this point the newly rebuilt btree
375
+ * is in place and we have to kill off all the old btree blocks.
376
+ */
377
+void
378
+xfs_refcountbt_commit_staged_btree(
379
+	struct xfs_btree_cur	*cur,
380
+	struct xfs_trans	*tp,
381
+	struct xfs_buf		*agbp)
382
+{
383
+	struct xfs_agf		*agf = agbp->b_addr;
384
+	struct xbtree_afakeroot	*afake = cur->bc_ag.afake;
385
+
386
+	ASSERT(cur->bc_flags & XFS_BTREE_STAGING);
387
+
388
+	agf->agf_refcount_root = cpu_to_be32(afake->af_root);
389
+	agf->agf_refcount_level = cpu_to_be32(afake->af_levels);
390
+	agf->agf_refcount_blocks = cpu_to_be32(afake->af_blocks);
391
+	xfs_alloc_log_agf(tp, agbp, XFS_AGF_REFCOUNT_BLOCKS |
392
+				    XFS_AGF_REFCOUNT_ROOT |
393
+				    XFS_AGF_REFCOUNT_LEVEL);
394
+	xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_refcountbt_ops);
350
395
 }
351
396
 
352
397
 /*
..
..
@@ -423,11 +468,20 @@
423
468
 	if (error)
424
469
 		return error;
425
470
 
426
-	agf = XFS_BUF_TO_AGF(agbp);
471
+	agf = agbp->b_addr;
427
472
 	agblocks = be32_to_cpu(agf->agf_length);
428
473
 	tree_len = be32_to_cpu(agf->agf_refcount_blocks);
429
474
 	xfs_trans_brelse(tp, agbp);
430
475
 
476
+	/*
477
+	 * The log is permanently allocated, so the space it occupies will
478
+	 * never be available for the kinds of things that would require btree
479
+	 * expansion.  We therefore can pretend the space isn't there.
480
+	 */
481
+	if (mp->m_sb.sb_logstart &&
482
+	    XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart) == agno)
483
+		agblocks -= mp->m_sb.sb_logblocks;
484
+
431
485
 	*ask += xfs_refcountbt_max_size(mp, agblocks);
432
486
 	*used += tree_len;
433
487