Rebuild the free space btrees from the gaps in the rmap btree.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/scrub/alloc.c | 414 +++++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/common.c | 4
fs/xfs/scrub/common.h | 5 +
3 files changed, 421 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/scrub/alloc.c b/fs/xfs/scrub/alloc.c
index 8d81875..da7fbce 100644
--- a/fs/xfs/scrub/alloc.c
+++ b/fs/xfs/scrub/alloc.c
@@ -30,9 +30,14 @@
#include "xfs_trans.h"
#include "xfs_trace.h"
#include "xfs_sb.h"
+#include "xfs_inode.h"
#include "xfs_rmap.h"
+#include "xfs_log.h"
+#include "xfs_trans_priv.h"
#include "xfs_alloc.h"
+#include "xfs_alloc_btree.h"
#include "xfs_ialloc.h"
+#include "xfs_rmap_btree.h"
#include "xfs_refcount.h"
#include "scrub/common.h"
#include "scrub/btree.h"
@@ -58,6 +63,39 @@ xfs_scrub_setup_ag_header(
return error;
}
+/*
+ * Set us up with AG headers and btree cursors. Push everything out
+ * of the log so that the busy extent list is empty.
+ */
+int
+xfs_scrub_setup_ag_allocbt(
+ struct xfs_scrub_context *sc,
+ struct xfs_inode *ip,
+ struct xfs_scrub_metadata *sm,
+ bool retry_deadlocked)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ int error;
+
+ /*
+ * Push everything out of the log onto disk prior to repairing.
+ * The busy extent list must be cleared before we can do anything.
+ */
+ if (sm->sm_flags & XFS_SCRUB_FLAG_REPAIR) {
+ error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
+ if (error)
+ goto out;
+ xfs_ail_push_all_sync(mp->m_ail);
+ }
+
+ error = xfs_scrub_setup_ag_header(sc, ip, sm, retry_deadlocked);
+ if (error)
+ goto out;
+ sc->retry = retry_deadlocked;
+out:
+ return error;
+}
+
/* Free space btree scrubber. */
/* Scrub a bnobt/cntbt record. */
@@ -184,3 +222,379 @@ xfs_scrub_cntbt(
{
return xfs_scrub_allocbt(sc, XFS_BTNUM_CNT);
}
+
+/* Free space btree repair. */
+
+struct xfs_repair_alloc_extent {
+ struct list_head list;
+ xfs_agblock_t bno;
+ xfs_extlen_t len;
+};
+
+struct xfs_repair_alloc {
+ struct list_head extlist;
+ struct list_head btlist; /* OWN_AG blocks */
+ struct list_head nobtlist; /* rmapbt/agfl blocks */
+ xfs_agblock_t next_bno;
+ uint64_t nr_records;
+};
+
+/* Record extents that aren't in use from gaps in the rmap records. */
+STATIC int
+xfs_repair_alloc_extent_fn(
+ struct xfs_btree_cur *cur,
+ struct xfs_rmap_irec *rec,
+ void *priv)
+{
+ struct xfs_repair_alloc *ra = priv;
+ struct xfs_repair_alloc_extent *rae;
+ struct xfs_buf *bp;
+ struct xfs_mount *mp = cur->bc_mp;
+ xfs_fsblock_t fsb;
+ int i;
+ int error;
+
+ /* Record all the OWN_AG blocks... */
+ if (rec->rm_owner == XFS_RMAP_OWN_AG) {
+ fsb = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_private.a.agno,
+ rec->rm_startblock);
+ error = xfs_repair_collect_btree_extent(cur->bc_mp,
+ &ra->btlist, fsb, rec->rm_blockcount);
+ if (error)
+ return error;
+ }
+
+ /* ...and all the rmapbt blocks... */
+ for (i = 0; i < cur->bc_nlevels && cur->bc_ptrs[i] == 1; i++) {
+ xfs_btree_get_block(cur, i, &bp);
+ if (!bp)
+ continue;
+ fsb = XFS_DADDR_TO_FSB(cur->bc_mp, bp->b_bn);
+ error = xfs_repair_collect_btree_extent(cur->bc_mp,
+ &ra->nobtlist, fsb, 1);
+ if (error)
+ return error;
+ }
+
+ /* ...and all the free space. */
+ if (rec->rm_startblock > ra->next_bno) {
+ trace_xfs_repair_alloc_extent_fn(mp, cur->bc_private.a.agno,
+ rec->rm_startblock, rec->rm_blockcount,
+ rec->rm_owner, rec->rm_offset, rec->rm_flags);
+
+ rae = kmem_alloc(sizeof(*rae), KM_NOFS);
+ if (!rae)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&rae->list);
+ rae->bno = ra->next_bno;
+ rae->len = rec->rm_startblock - ra->next_bno;
+ list_add_tail(&rae->list, &ra->extlist);
+ ra->nr_records++;
+ }
+ ra->next_bno = max_t(xfs_agblock_t, ra->next_bno,
+ rec->rm_startblock + rec->rm_blockcount);
+ return 0;
+}
+
+/* Find the longest free extent in the list. */
+static struct xfs_repair_alloc_extent *
+xfs_repair_allocbt_get_longest(
+ struct xfs_repair_alloc *ra)
+{
+ struct xfs_repair_alloc_extent *rae;
+ struct xfs_repair_alloc_extent *longest = NULL;
+
+ list_for_each_entry(rae, &ra->extlist, list)
+ if (!longest || rae->len > longest->len)
+ longest = rae;
+ return longest;
+}
+
+/* Collect an AGFL block for the not-to-release list. */
+static int
+xfs_repair_collect_agfl_block(
+ struct xfs_scrub_context *sc,
+ xfs_agblock_t bno,
+ void *data)
+{
+ struct xfs_repair_alloc *ra = data;
+ xfs_fsblock_t fsb;
+
+ fsb = XFS_AGB_TO_FSB(sc->tp->t_mountp, sc->sa.agno, bno);
+ return xfs_repair_collect_btree_extent(sc->tp->t_mountp,
+ &ra->nobtlist, fsb, 1);
+}
+
+/* Compare two btree extents. */
+static int
+xfs_repair_allocbt_extent_cmp(
+ void *priv,
+ struct list_head *a,
+ struct list_head *b)
+{
+ struct xfs_repair_alloc_extent *ap;
+ struct xfs_repair_alloc_extent *bp;
+
+ ap = container_of(a, struct xfs_repair_alloc_extent, list);
+ bp = container_of(b, struct xfs_repair_alloc_extent, list);
+
+ if (ap->bno > bp->bno)
+ return 1;
+ else if (ap->bno < bp->bno)
+ return -1;
+ return 0;
+}
+
+/* Put an extent onto the free list. */
+STATIC int
+xfs_repair_allocbt_free_extent(
+ struct xfs_scrub_context *sc,
+ xfs_fsblock_t fsbno,
+ xfs_extlen_t len,
+ struct xfs_owner_info *oinfo)
+{
+ int error;
+
+ error = xfs_free_extent(sc->tp, fsbno, len, oinfo, 0);
+ if (error)
+ return error;
+ error = xfs_repair_roll_ag_trans(sc);
+ if (error)
+ return error;
+ return xfs_mod_fdblocks(sc->tp->t_mountp, -(int64_t)len, false);
+}
+
+/* Repair the freespace btrees for some AG. */
+int
+xfs_repair_allocbt(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_repair_alloc ra;
+ struct xfs_owner_info oinfo;
+ struct xfs_mount *mp = sc->tp->t_mountp;
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_repair_alloc_extent *longest;
+ struct xfs_repair_alloc_extent *rae;
+ struct xfs_repair_alloc_extent *n;
+ struct xfs_perag *pag;
+ struct xfs_agf *agf;
+ struct xfs_buf *bp;
+ xfs_fsblock_t bnofsb;
+ xfs_fsblock_t cntfsb;
+ xfs_extlen_t oldf;
+ xfs_extlen_t nr_blocks;
+ xfs_agblock_t agend;
+ int error;
+
+ /* We require the rmapbt to rebuild anything. */
+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return -EOPNOTSUPP;
+
+ /*
+ * Make sure the busy extent list is clear because we can't put
+ * extents on there twice.
+ */
+ pag = xfs_perag_get(mp, sc->sa.agno);
+ spin_lock(&pag->pagb_lock);
+ if (pag->pagb_tree.rb_node) {
+ spin_unlock(&pag->pagb_lock);
+ xfs_perag_put(pag);
+ return -EDEADLOCK;
+ }
+ spin_unlock(&pag->pagb_lock);
+ xfs_perag_put(pag);
+
+ /*
+ * Collect all reverse mappings for free extents, and the rmapbt
+ * blocks. We can discover the rmapbt blocks completely from a
+ * query_all handler because there are always rmapbt entries.
+ * (One cannot use on query_all to visit all of a btree's blocks
+ * unless that btree is guaranteed to have at least one entry.)
+ */
+ INIT_LIST_HEAD(&ra.extlist);
+ INIT_LIST_HEAD(&ra.btlist);
+ INIT_LIST_HEAD(&ra.nobtlist);
+ ra.next_bno = 0;
+ ra.nr_records = 0;
+ cur = xfs_rmapbt_init_cursor(mp, sc->tp, sc->sa.agf_bp, sc->sa.agno);
+ error = xfs_rmap_query_all(cur, xfs_repair_alloc_extent_fn, &ra);
+ if (error)
+ goto out;
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ cur = NULL;
+
+ /* Insert a record for space between the last rmap and EOAG. */
+ agf = XFS_BUF_TO_AGF(sc->sa.agf_bp);
+ agend = be32_to_cpu(agf->agf_length);
+ if (ra.next_bno < agend) {
+ rae = kmem_alloc(sizeof(*rae), KM_NOFS);
+ if (!rae) {
+ error = -ENOMEM;
+ goto out;
+ }
+ INIT_LIST_HEAD(&rae->list);
+ rae->bno = ra.next_bno;
+ rae->len = agend - ra.next_bno;
+ list_add_tail(&rae->list, &ra.extlist);
+ ra.nr_records++;
+ }
+
+ /* Collect all the AGFL blocks. */
+ error = xfs_scrub_walk_agfl(sc, xfs_repair_collect_agfl_block, &ra);
+ if (error)
+ goto out;
+
+ /* Do we actually have enough space to do this? */
+ pag = xfs_perag_get(mp, sc->sa.agno);
+ nr_blocks = 2 * xfs_allocbt_calc_size(mp, ra.nr_records);
+ if (!xfs_repair_ag_has_space(pag, nr_blocks, XFS_AG_RESV_NONE)) {
+ xfs_perag_put(pag);
+ error = -ENOSPC;
+ goto out;
+ }
+ xfs_perag_put(pag);
+
+ /* Allocate new bnobt root. */
+ longest = xfs_repair_allocbt_get_longest(&ra);
+ if (longest == NULL) {
+ error = -ENOSPC;
+ goto out;
+ }
+ bnofsb = XFS_AGB_TO_FSB(mp, sc->sa.agno, longest->bno);
+ longest->bno++;
+ longest->len--;
+
+ /* Allocate new cntbt root. */
+ if (longest->len == 0) {
+ list_del(&longest->list);
+ kmem_free(longest);
+ longest = xfs_repair_allocbt_get_longest(&ra);
+ if (longest == NULL) {
+ error = -ENOSPC;
+ goto out;
+ }
+ }
+ cntfsb = XFS_AGB_TO_FSB(mp, sc->sa.agno, longest->bno);
+ longest->bno++;
+ longest->len--;
+ if (longest->len == 0) {
+ list_del(&longest->list);
+ kmem_free(longest);
+ longest = xfs_repair_allocbt_get_longest(&ra);
+ }
+
+ agf = XFS_BUF_TO_AGF(sc->sa.agf_bp);
+ /* Initialize new bnobt root. */
+ error = xfs_repair_init_btblock(sc, bnofsb, &bp, XFS_ABTB_CRC_MAGIC,
+ &xfs_allocbt_buf_ops);
+ if (error)
+ goto out;
+ agf->agf_roots[XFS_BTNUM_BNOi] =
+ cpu_to_be32(XFS_FSB_TO_AGBNO(mp, bnofsb));
+ agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
+
+ /* Initialize new cntbt root. */
+ error = xfs_repair_init_btblock(sc, cntfsb, &bp, XFS_ABTC_CRC_MAGIC,
+ &xfs_allocbt_buf_ops);
+ if (error)
+ goto out;
+ agf->agf_roots[XFS_BTNUM_CNTi] =
+ cpu_to_be32(XFS_FSB_TO_AGBNO(mp, cntfsb));
+ agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
+
+ /*
+ * Since we're abandoning the old bnobt/cntbt, we have to
+ * decrease fdblocks by the # of blocks in those trees.
+ * btreeblks counts the non-root blocks of the free space
+ * and rmap btrees. Do this before resetting the AGF counters.
+ */
+ pag = xfs_perag_get(mp, sc->sa.agno);
+ oldf = pag->pagf_btreeblks + 2;
+ oldf -= (be32_to_cpu(agf->agf_rmap_blocks) - 1);
+ error = xfs_mod_fdblocks(mp, -(int64_t)oldf, false);
+ if (error) {
+ xfs_perag_put(pag);
+ goto out;
+ }
+
+ /* Reset the perag info. */
+ pag->pagf_btreeblks = be32_to_cpu(agf->agf_rmap_blocks) - 1;
+ pag->pagf_freeblks = 0;
+ pag->pagf_longest = 0;
+ pag->pagf_levels[XFS_BTNUM_BNOi] =
+ be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi]);
+ pag->pagf_levels[XFS_BTNUM_CNTi] =
+ be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]);
+
+ /* Now reset the AGF counters. */
+ agf->agf_btreeblks = cpu_to_be32(pag->pagf_btreeblks);
+ agf->agf_freeblks = cpu_to_be32(pag->pagf_freeblks);
+ agf->agf_longest = cpu_to_be32(pag->pagf_longest);
+ xfs_perag_put(pag);
+ xfs_alloc_log_agf(sc->tp, sc->sa.agf_bp,
+ XFS_AGF_ROOTS | XFS_AGF_LEVELS | XFS_AGF_BTREEBLKS |
+ XFS_AGF_LONGEST | XFS_AGF_FREEBLKS);
+ error = xfs_repair_roll_ag_trans(sc);
+ if (error)
+ goto out;
+
+ /*
+ * Insert the longest free extent in case it's necessary to
+ * refresh the AGFL with multiple blocks.
+ */
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_UNKNOWN);
+ if (longest && longest->len == 0) {
+ error = xfs_repair_allocbt_free_extent(sc,
+ XFS_AGB_TO_FSB(mp, sc->sa.agno, longest->bno),
+ longest->len, &oinfo);
+ if (error)
+ goto out;
+ list_del(&longest->list);
+ kmem_free(longest);
+ }
+
+ /* Insert records into the new btrees. */
+ list_sort(NULL, &ra.extlist, xfs_repair_allocbt_extent_cmp);
+ list_for_each_entry_safe(rae, n, &ra.extlist, list) {
+ error = xfs_repair_allocbt_free_extent(sc,
+ XFS_AGB_TO_FSB(mp, sc->sa.agno, rae->bno),
+ rae->len, &oinfo);
+ if (error)
+ goto out;
+ list_del(&rae->list);
+ kmem_free(rae);
+ }
+
+ /* Add rmap records for the btree roots */
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
+ error = xfs_rmap_alloc(sc->tp, sc->sa.agf_bp, sc->sa.agno,
+ XFS_FSB_TO_AGBNO(mp, bnofsb), 1, &oinfo);
+ if (error)
+ goto out;
+ error = xfs_rmap_alloc(sc->tp, sc->sa.agf_bp, sc->sa.agno,
+ XFS_FSB_TO_AGBNO(mp, cntfsb), 1, &oinfo);
+ if (error)
+ goto out;
+
+ /* Free all the OWN_AG blocks that are not in the rmapbt/agfl. */
+ error = xfs_repair_subtract_extents(mp, &ra.btlist, &ra.nobtlist);
+ if (error)
+ goto out;
+ xfs_repair_cancel_btree_extents(sc, &ra.nobtlist);
+ error = xfs_repair_reap_btree_extents(sc, &ra.btlist, &oinfo,
+ XFS_AG_RESV_NONE);
+ if (error)
+ goto out;
+
+ return 0;
+out:
+ xfs_repair_cancel_btree_extents(sc, &ra.btlist);
+ xfs_repair_cancel_btree_extents(sc, &ra.nobtlist);
+ if (cur)
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ list_for_each_entry_safe(rae, n, &ra.extlist, list) {
+ list_del(&rae->list);
+ kmem_free(rae);
+ }
+ return error;
+}
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index ceaa528..d975be9 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -765,8 +765,8 @@ static const struct xfs_scrub_meta_fns meta_scrub_fns[] = {
{xfs_scrub_setup_ag, xfs_scrub_agf, xfs_repair_agf, NULL},
{xfs_scrub_setup_ag, xfs_scrub_agfl, xfs_repair_agfl, NULL},
{xfs_scrub_setup_ag, xfs_scrub_agi, xfs_repair_agi, NULL},
- {xfs_scrub_setup_ag_header, xfs_scrub_bnobt, NULL, NULL},
- {xfs_scrub_setup_ag_header, xfs_scrub_cntbt, NULL, NULL},
+ {xfs_scrub_setup_ag_allocbt, xfs_scrub_bnobt, xfs_repair_allocbt, NULL},
+ {xfs_scrub_setup_ag_allocbt, xfs_scrub_cntbt, xfs_repair_allocbt, NULL},
{xfs_scrub_setup_ag_iallocbt, xfs_scrub_inobt, NULL, NULL},
{xfs_scrub_setup_ag_iallocbt, xfs_scrub_finobt, NULL, xfs_sb_version_hasfinobt},
{xfs_scrub_setup_ag_header, xfs_scrub_rmapbt, NULL, xfs_sb_version_hasrmapbt},
diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
index e23a22a..4dc5890 100644
--- a/fs/xfs/scrub/common.h
+++ b/fs/xfs/scrub/common.h
@@ -275,6 +275,10 @@ int xfs_scrub_setup_ag_header(struct xfs_scrub_context *sc,
struct xfs_inode *ip,
struct xfs_scrub_metadata *sm,
bool retry_deadlocked);
+int xfs_scrub_setup_ag_allocbt(struct xfs_scrub_context *sc,
+ struct xfs_inode *ip,
+ struct xfs_scrub_metadata *sm,
+ bool retry_deadlocked);
int xfs_scrub_setup_ag_iallocbt(struct xfs_scrub_context *sc,
struct xfs_inode *ip,
struct xfs_scrub_metadata *sm,
@@ -378,5 +382,6 @@ int xfs_repair_superblock(struct xfs_scrub_context *sc);
int xfs_repair_agf(struct xfs_scrub_context *sc);
int xfs_repair_agfl(struct xfs_scrub_context *sc);
int xfs_repair_agi(struct xfs_scrub_context *sc);
+int xfs_repair_allocbt(struct xfs_scrub_context *sc);
#endif /* __XFS_REPAIR_COMMON_H__ */
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