From: Darrick J. Wong <djwong@xxxxxxxxxx>
Create a new xrep_newbt structure to encapsulate a fake root for
creating a staged btree cursor as well as to track all the blocks that
we need to reserve in order to build that btree.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
fs/xfs/Makefile | 1
fs/xfs/libxfs/xfs_btree_staging.h | 7 -
fs/xfs/scrub/agheader_repair.c | 1
fs/xfs/scrub/common.c | 1
fs/xfs/scrub/newbt.c | 399 +++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/newbt.h | 64 ++++++
fs/xfs/scrub/scrub.c | 2
fs/xfs/scrub/trace.h | 36 +++
8 files changed, 506 insertions(+), 5 deletions(-)
create mode 100644 fs/xfs/scrub/newbt.c
create mode 100644 fs/xfs/scrub/newbt.h
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 73bebce4d6f9..90f1f01277be 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -171,6 +171,7 @@ xfs-$(CONFIG_XFS_QUOTA) += scrub/quota.o
ifeq ($(CONFIG_XFS_ONLINE_REPAIR),y)
xfs-y += $(addprefix scrub/, \
agheader_repair.o \
+ newbt.o \
reap.o \
repair.o \
)
diff --git a/fs/xfs/libxfs/xfs_btree_staging.h b/fs/xfs/libxfs/xfs_btree_staging.h
index f0d2976050ae..d6dea3f0088c 100644
--- a/fs/xfs/libxfs/xfs_btree_staging.h
+++ b/fs/xfs/libxfs/xfs_btree_staging.h
@@ -38,11 +38,8 @@ struct xbtree_ifakeroot {
/* Number of bytes available for this fork in the inode. */
unsigned int if_fork_size;
- /* Fork format. */
- unsigned int if_format;
-
- /* Number of records. */
- unsigned int if_extents;
+ /* Which fork is this btree being built for? */
+ int if_whichfork;
};
/* Cursor interactions with fake roots for inode-rooted btrees. */
diff --git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index df0dadcedd97..5140f52fa9a1 100644
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -10,6 +10,7 @@
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_btree.h"
+#include "xfs_btree_staging.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index 002bb90559ff..6b2e14aecd66 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -10,6 +10,7 @@
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_btree.h"
+#include "xfs_btree_staging.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_inode.h"
diff --git a/fs/xfs/scrub/newbt.c b/fs/xfs/scrub/newbt.c
new file mode 100644
index 000000000000..9d677640e65e
--- /dev/null
+++ b/fs/xfs/scrub/newbt.c
@@ -0,0 +1,399 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2022 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_btree.h"
+#include "xfs_btree_staging.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_inode.h"
+#include "xfs_alloc.h"
+#include "xfs_rmap.h"
+#include "xfs_ag.h"
+#include "xfs_defer.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/trace.h"
+#include "scrub/repair.h"
+#include "scrub/newbt.h"
+
+/*
+ * Estimate proper slack values for a btree that's being reloaded.
+ *
+ * Under most circumstances, we'll take whatever default loading value the
+ * btree bulk loading code calculates for us. However, there are some
+ * exceptions to this rule:
+ *
+ * (1) If someone turned one of the debug knobs.
+ * (2) If this is a per-AG btree and the AG has less than ~9% space free.
+ * (3) If this is an inode btree and the FS has less than ~9% space free.
+ *
+ * Note that we actually use 3/32 for the comparison to avoid division.
+ */
+static void
+xrep_newbt_estimate_slack(
+ struct xrep_newbt *xnr)
+{
+ struct xfs_scrub *sc = xnr->sc;
+ struct xfs_btree_bload *bload = &xnr->bload;
+ uint64_t free;
+ uint64_t sz;
+
+ /* Let the btree code compute the default slack values. */
+ bload->leaf_slack = -1;
+ bload->node_slack = -1;
+
+ if (sc->ops->type == ST_PERAG) {
+ free = sc->sa.pag->pagf_freeblks;
+ sz = xfs_ag_block_count(sc->mp, sc->sa.pag->pag_agno);
+ } else {
+ free = percpu_counter_sum(&sc->mp->m_fdblocks);
+ sz = sc->mp->m_sb.sb_dblocks;
+ }
+
+ /* No further changes if there's more than 3/32ths space left. */
+ if (free >= ((sz * 3) >> 5))
+ return;
+
+ /* We're low on space; load the btrees as tightly as possible. */
+ if (bload->leaf_slack < 0)
+ bload->leaf_slack = 0;
+ if (bload->node_slack < 0)
+ bload->node_slack = 0;
+}
+
+/* Initialize accounting resources for staging a new AG btree. */
+void
+xrep_newbt_init_ag(
+ struct xrep_newbt *xnr,
+ struct xfs_scrub *sc,
+ const struct xfs_owner_info *oinfo,
+ xfs_fsblock_t alloc_hint,
+ enum xfs_ag_resv_type resv)
+{
+ memset(xnr, 0, sizeof(struct xrep_newbt));
+ xnr->sc = sc;
+ xnr->oinfo = *oinfo; /* structure copy */
+ xnr->alloc_hint = alloc_hint;
+ xnr->resv = resv;
+ INIT_LIST_HEAD(&xnr->resv_list);
+ xrep_newbt_estimate_slack(xnr);
+}
+
+/* Initialize accounting resources for staging a new inode fork btree. */
+int
+xrep_newbt_init_inode(
+ struct xrep_newbt *xnr,
+ struct xfs_scrub *sc,
+ int whichfork,
+ const struct xfs_owner_info *oinfo)
+{
+ struct xfs_ifork *ifp;
+
+ ifp = kmem_cache_zalloc(xfs_ifork_cache, XCHK_GFP_FLAGS);
+ if (!ifp)
+ return -ENOMEM;
+
+ xrep_newbt_init_ag(xnr, sc, oinfo,
+ XFS_INO_TO_FSB(sc->mp, sc->ip->i_ino),
+ XFS_AG_RESV_NONE);
+ xnr->ifake.if_fork = ifp;
+ xnr->ifake.if_fork_size = xfs_inode_fork_size(sc->ip, whichfork);
+ xnr->ifake.if_whichfork = whichfork;
+ return 0;
+}
+
+/*
+ * Initialize accounting resources for staging a new btree. Callers are
+ * expected to add their own reservations (and clean them up) manually.
+ */
+void
+xrep_newbt_init_bare(
+ struct xrep_newbt *xnr,
+ struct xfs_scrub *sc)
+{
+ xrep_newbt_init_ag(xnr, sc, &XFS_RMAP_OINFO_ANY_OWNER, NULLFSBLOCK,
+ XFS_AG_RESV_NONE);
+}
+
+/* Designate specific blocks to be used to build our new btree. */
+int
+xrep_newbt_add_blocks(
+ struct xrep_newbt *xnr,
+ xfs_fsblock_t fsbno,
+ xfs_extlen_t len)
+{
+ struct xrep_newbt_resv *resv;
+ struct xfs_mount *mp = xnr->sc->mp;
+
+ resv = kmalloc(sizeof(struct xrep_newbt_resv), XCHK_GFP_FLAGS);
+ if (!resv)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&resv->list);
+ resv->agbno = XFS_FSB_TO_AGBNO(mp, fsbno);
+ resv->len = len;
+ resv->used = 0;
+ resv->pag = xfs_perag_get(mp, XFS_FSB_TO_AGNO(mp, fsbno));
+
+ list_add_tail(&resv->list, &xnr->resv_list);
+ return 0;
+}
+
+/* Allocate disk space for our new btree. */
+int
+xrep_newbt_alloc_blocks(
+ struct xrep_newbt *xnr,
+ uint64_t nr_blocks)
+{
+ struct xfs_scrub *sc = xnr->sc;
+ xfs_alloctype_t type;
+ xfs_fsblock_t alloc_hint = xnr->alloc_hint;
+ int error = 0;
+
+ /*
+ * Inode-rooted btrees can allocate from any AG, whereas AG btrees
+ * require a specific AG mentioned in the alloc hint..
+ */
+ type = sc->ip ? XFS_ALLOCTYPE_START_BNO : XFS_ALLOCTYPE_NEAR_BNO;
+
+ while (nr_blocks > 0) {
+ struct xfs_alloc_arg args = {
+ .tp = sc->tp,
+ .mp = sc->mp,
+ .type = type,
+ .fsbno = alloc_hint,
+ .oinfo = xnr->oinfo,
+ .minlen = 1,
+ .maxlen = nr_blocks,
+ .prod = 1,
+ .resv = xnr->resv,
+ };
+
+ error = xfs_alloc_vextent(&args);
+ if (error)
+ return error;
+ if (args.fsbno == NULLFSBLOCK)
+ return -ENOSPC;
+
+ trace_xrep_newbt_alloc_blocks(sc->mp,
+ XFS_FSB_TO_AGNO(sc->mp, args.fsbno),
+ XFS_FSB_TO_AGBNO(sc->mp, args.fsbno),
+ args.len, xnr->oinfo.oi_owner);
+
+ error = xrep_newbt_add_blocks(xnr, args.fsbno, args.len);
+ if (error)
+ return error;
+
+ nr_blocks -= args.len;
+ alloc_hint = args.fsbno + args.len - 1;
+
+ error = xrep_defer_finish(sc);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+/*
+ * How many extent freeing items can we attach to a transaction before we want
+ * to finish the chain so that unreserving new btree blocks doesn't overrun
+ * the transaction reservation?
+ */
+#define XREP_REAP_MAX_NEWBT_EFIS (128)
+
+/*
+ * Free the unused part of an extent. Returns the number of EFIs logged or
+ * a negative errno.
+ */
+STATIC int
+xrep_newbt_free_extent(
+ struct xrep_newbt *xnr,
+ struct xrep_newbt_resv *resv,
+ bool btree_committed)
+{
+ struct xfs_scrub *sc = xnr->sc;
+ xfs_agblock_t free_agbno = resv->agbno;
+ xfs_extlen_t free_aglen = resv->len;
+ xfs_fsblock_t fsbno;
+ int error;
+
+ /* If we don't commit the new btree, free all of the space. */
+ if (btree_committed) {
+ free_agbno += resv->used;
+ free_aglen -= resv->used;
+ }
+
+ if (free_aglen == 0)
+ return 0;
+
+ trace_xrep_newbt_free_blocks(sc->mp, resv->pag->pag_agno, free_agbno,
+ free_aglen, xnr->oinfo.oi_owner);
+
+ if (xnr->resv == XFS_AG_RESV_NONE) {
+ /*
+ * No per-AG reservation means that we can use EFIs to free the
+ * reservations. This reduces the chance that we leak blocks
+ * if the system goes down.
+ */
+ fsbno = XFS_AGB_TO_FSB(sc->mp, resv->pag->pag_agno, free_agbno);
+ __xfs_free_extent_later(sc->tp, fsbno, free_aglen, &xnr->oinfo,
+ true);
+ return 1;
+ }
+
+ if (xnr->resv == XFS_AG_RESV_RMAPBT ||
+ xnr->resv == XFS_AG_RESV_METADATA) {
+ /*
+ * Metadata blocks taken from a per-AG reservation must be put
+ * back into that reservation immediately because EFIs cannot
+ * free into per-AG reservations.
+ */
+ error = __xfs_free_extent(sc->tp, resv->pag, free_agbno,
+ free_aglen, &xnr->oinfo, xnr->resv, true);
+ if (error < 0)
+ return error;
+ return XREP_REAP_MAX_NEWBT_EFIS;
+ }
+
+ ASSERT(0);
+ return -EFSCORRUPTED;
+}
+
+/* Free all the accounting info and disk space we reserved for a new btree. */
+STATIC int
+xrep_newbt_free(
+ struct xrep_newbt *xnr,
+ bool btree_committed)
+{
+ struct xfs_scrub *sc = xnr->sc;
+ struct xrep_newbt_resv *resv, *n;
+ unsigned int freed = 0;
+ int error = 0;
+
+ /*
+ * If the filesystem already went down, we can't free the blocks. Skip
+ * ahead to freeing the incore metadata because we can't fix anything.
+ */
+ if (xfs_is_shutdown(sc->mp))
+ goto junkit;
+
+ list_for_each_entry_safe(resv, n, &xnr->resv_list, list) {
+ int ret;
+
+ ret = xrep_newbt_free_extent(xnr, resv, btree_committed);
+ list_del(&resv->list);
+ xfs_perag_put(resv->pag);
+ kfree(resv);
+ if (ret < 0) {
+ error = ret;
+ goto junkit;
+ }
+
+ freed += ret;
+ if (freed >= XREP_REAP_MAX_NEWBT_EFIS) {
+ error = xrep_defer_finish(sc);
+ if (error)
+ goto junkit;
+ freed = 0;
+ }
+ }
+
+ if (freed)
+ error = xrep_defer_finish(sc);
+
+junkit:
+ /*
+ * If we still have reservations attached to @newbt, cleanup must have
+ * failed and the filesystem is about to go down. Clean up the incore
+ * reservations.
+ */
+ list_for_each_entry_safe(resv, n, &xnr->resv_list, list) {
+ list_del(&resv->list);
+ xfs_perag_put(resv->pag);
+ kfree(resv);
+ }
+
+ if (sc->ip) {
+ kmem_cache_free(xfs_ifork_cache, xnr->ifake.if_fork);
+ xnr->ifake.if_fork = NULL;
+ }
+
+ return error;
+}
+
+/*
+ * Free all the accounting info and unused disk space allocations after
+ * committing a new btree.
+ */
+int
+xrep_newbt_commit(
+ struct xrep_newbt *xnr)
+{
+ return xrep_newbt_free(xnr, true);
+}
+
+/*
+ * Free all the accounting info and all of the disk space we reserved for a new
+ * btree that we're not going to commit. We want to try to roll things back
+ * cleanly for things like ENOSPC midway through allocation.
+ */
+void
+xrep_newbt_cancel(
+ struct xrep_newbt *xnr)
+{
+ xrep_newbt_free(xnr, false);
+}
+
+/* Feed one of the reserved btree blocks to the bulk loader. */
+int
+xrep_newbt_claim_block(
+ struct xfs_btree_cur *cur,
+ struct xrep_newbt *xnr,
+ union xfs_btree_ptr *ptr)
+{
+ struct xrep_newbt_resv *resv;
+ struct xfs_mount *mp = cur->bc_mp;
+ xfs_agblock_t agbno;
+
+ /*
+ * The first item in the list should always have a free block unless
+ * we're completely out.
+ */
+ resv = list_first_entry(&xnr->resv_list, struct xrep_newbt_resv, list);
+ if (resv->used == resv->len)
+ return -ENOSPC;
+
+ /*
+ * Peel off a block from the start of the reservation. We allocate
+ * blocks in order to place blocks on disk in increasing record or key
+ * order. The block reservations tend to end up on the list in
+ * decreasing order, which hopefully results in leaf blocks ending up
+ * together.
+ */
+ agbno = resv->agbno + resv->used;
+ resv->used++;
+
+ /* If we used all the blocks in this reservation, move it to the end. */
+ if (resv->used == resv->len)
+ list_move_tail(&resv->list, &xnr->resv_list);
+
+ trace_xrep_newbt_claim_block(mp, resv->pag->pag_agno, agbno, 1,
+ xnr->oinfo.oi_owner);
+
+ if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
+ ptr->l = cpu_to_be64(XFS_AGB_TO_FSB(mp, resv->pag->pag_agno,
+ agbno));
+ else
+ ptr->s = cpu_to_be32(agbno);
+ return 0;
+}
diff --git a/fs/xfs/scrub/newbt.h b/fs/xfs/scrub/newbt.h
new file mode 100644
index 000000000000..ad24cb32a7f1
--- /dev/null
+++ b/fs/xfs/scrub/newbt.h
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2022 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#ifndef __XFS_SCRUB_NEWBT_H__
+#define __XFS_SCRUB_NEWBT_H__
+
+struct xrep_newbt_resv {
+ /* Link to list of extents that we've reserved. */
+ struct list_head list;
+
+ struct xfs_perag *pag;
+
+ /* AG block of the extent we reserved. */
+ xfs_agblock_t agbno;
+
+ /* Length of the reservation. */
+ xfs_extlen_t len;
+
+ /* How much of this reservation has been used. */
+ xfs_extlen_t used;
+};
+
+struct xrep_newbt {
+ struct xfs_scrub *sc;
+
+ /* List of extents that we've reserved. */
+ struct list_head resv_list;
+
+ /* Fake root for new btree. */
+ union {
+ struct xbtree_afakeroot afake;
+ struct xbtree_ifakeroot ifake;
+ };
+
+ /* rmap owner of these blocks */
+ struct xfs_owner_info oinfo;
+
+ /* btree geometry for the bulk loader */
+ struct xfs_btree_bload bload;
+
+ /* Allocation hint */
+ xfs_fsblock_t alloc_hint;
+
+ /* per-ag reservation type */
+ enum xfs_ag_resv_type resv;
+};
+
+void xrep_newbt_init_bare(struct xrep_newbt *xnr, struct xfs_scrub *sc);
+void xrep_newbt_init_ag(struct xrep_newbt *xnr, struct xfs_scrub *sc,
+ const struct xfs_owner_info *oinfo, xfs_fsblock_t alloc_hint,
+ enum xfs_ag_resv_type resv);
+int xrep_newbt_init_inode(struct xrep_newbt *xnr, struct xfs_scrub *sc,
+ int whichfork, const struct xfs_owner_info *oinfo);
+int xrep_newbt_add_blocks(struct xrep_newbt *xnr, xfs_fsblock_t fsbno,
+ xfs_extlen_t len);
+int xrep_newbt_alloc_blocks(struct xrep_newbt *xnr, uint64_t nr_blocks);
+void xrep_newbt_cancel(struct xrep_newbt *xnr);
+int xrep_newbt_commit(struct xrep_newbt *xnr);
+int xrep_newbt_claim_block(struct xfs_btree_cur *cur, struct xrep_newbt *xnr,
+ union xfs_btree_ptr *ptr);
+
+#endif /* __XFS_SCRUB_NEWBT_H__ */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 6697f5f32106..afd481f5a15e 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -17,6 +17,8 @@
#include "xfs_errortag.h"
#include "xfs_error.h"
#include "xfs_scrub.h"
+#include "xfs_btree.h"
+#include "xfs_btree_staging.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"
diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h
index df36311081a5..cb33f42190df 100644
--- a/fs/xfs/scrub/trace.h
+++ b/fs/xfs/scrub/trace.h
@@ -989,6 +989,42 @@ TRACE_EVENT(xrep_ialloc_insert,
__entry->freemask)
)
+DECLARE_EVENT_CLASS(xrep_newbt_extent_class,
+ TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno,
+ xfs_agblock_t agbno, xfs_extlen_t len,
+ int64_t owner),
+ TP_ARGS(mp, agno, agbno, len, owner),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(xfs_agnumber_t, agno)
+ __field(xfs_agblock_t, agbno)
+ __field(xfs_extlen_t, len)
+ __field(int64_t, owner)
+ ),
+ TP_fast_assign(
+ __entry->dev = mp->m_super->s_dev;
+ __entry->agno = agno;
+ __entry->agbno = agbno;
+ __entry->len = len;
+ __entry->owner = owner;
+ ),
+ TP_printk("dev %d:%d agno 0x%x agbno 0x%x fsbcount 0x%x owner 0x%llx",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->agno,
+ __entry->agbno,
+ __entry->len,
+ __entry->owner)
+);
+#define DEFINE_NEWBT_EXTENT_EVENT(name) \
+DEFINE_EVENT(xrep_newbt_extent_class, name, \
+ TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \
+ xfs_agblock_t agbno, xfs_extlen_t len, \
+ int64_t owner), \
+ TP_ARGS(mp, agno, agbno, len, owner))
+DEFINE_NEWBT_EXTENT_EVENT(xrep_newbt_alloc_blocks);
+DEFINE_NEWBT_EXTENT_EVENT(xrep_newbt_free_blocks);
+DEFINE_NEWBT_EXTENT_EVENT(xrep_newbt_claim_block);
+
#endif /* IS_ENABLED(CONFIG_XFS_ONLINE_REPAIR) */
#endif /* _TRACE_XFS_SCRUB_TRACE_H */
