From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Add some helper functions for repair functions that will help us to
allocate and initialize new metadata blocks for btrees that we're
rebuilding.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/scrub/bmap.c | 3
fs/xfs/scrub/common.c | 8
fs/xfs/scrub/common.h | 9 +
fs/xfs/scrub/inode.c | 4
fs/xfs/scrub/repair.c | 816 +++++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/repair.h | 87 +++++
fs/xfs/scrub/scrub.c | 2
fs/xfs/scrub/scrub.h | 1
8 files changed, 924 insertions(+), 6 deletions(-)
diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
index 23556ca..61ca221 100644
--- a/fs/xfs/scrub/bmap.c
+++ b/fs/xfs/scrub/bmap.c
@@ -74,8 +74,7 @@ xfs_scrub_setup_inode_bmap(
goto out;
}
- /* Got the inode, lock it and we're ready to go. */
- error = xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
+ error = xfs_scrub_trans_alloc(sc->sm, mp, 0, &sc->tp);
if (error)
goto out;
sc->ilock_flags |= XFS_ILOCK_EXCL;
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index fe3a2b1..5b8c989 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -49,6 +49,7 @@
#include "scrub/common.h"
#include "scrub/trace.h"
#include "scrub/btree.h"
+#include "scrub/repair.h"
/* Common code for the metadata scrubbers. */
@@ -574,7 +575,10 @@ xfs_scrub_setup_fs(
struct xfs_scrub_context *sc,
struct xfs_inode *ip)
{
- return xfs_scrub_trans_alloc(sc->sm, sc->mp, &sc->tp);
+ uint resblks;
+
+ resblks = xfs_repair_calc_ag_resblks(sc);
+ return xfs_scrub_trans_alloc(sc->sm, sc->mp, resblks, &sc->tp);
}
/* Set us up with AG headers and btree cursors. */
@@ -705,7 +709,7 @@ xfs_scrub_setup_inode_contents(
/* Got the inode, lock it and we're ready to go. */
sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
xfs_ilock(sc->ip, sc->ilock_flags);
- error = xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
+ error = xfs_scrub_trans_alloc(sc->sm, mp, resblks, &sc->tp);
if (error)
goto out;
sc->ilock_flags |= XFS_ILOCK_EXCL;
diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
index deaf604..d37c53c 100644
--- a/fs/xfs/scrub/common.h
+++ b/fs/xfs/scrub/common.h
@@ -41,13 +41,22 @@ xfs_scrub_should_terminate(
/*
* Grab an empty transaction so that we can re-grab locked buffers if
* one of our btrees turns out to be cyclic.
+ *
+ * If we're going to repair something, we need to ask for the largest
+ * possible log reservation so that we can handle the worst case
+ * scenario for rebuilding a metadata item.
*/
static inline int
xfs_scrub_trans_alloc(
struct xfs_scrub_metadata *sm,
struct xfs_mount *mp,
+ uint blocks,
struct xfs_trans **tpp)
{
+ if (sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR)
+ return xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
+ blocks, 0, 0, tpp);
+
return xfs_trans_alloc_empty(mp, tpp);
}
diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c
index 25bca48..fe07fe2 100644
--- a/fs/xfs/scrub/inode.c
+++ b/fs/xfs/scrub/inode.c
@@ -68,7 +68,7 @@ xfs_scrub_setup_inode(
break;
case -EFSCORRUPTED:
case -EFSBADCRC:
- return xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
+ return xfs_scrub_trans_alloc(sc->sm, mp, 0, &sc->tp);
default:
return error;
}
@@ -76,7 +76,7 @@ xfs_scrub_setup_inode(
/* Got the inode, lock it and we're ready to go. */
sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
xfs_ilock(sc->ip, sc->ilock_flags);
- error = xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
+ error = xfs_scrub_trans_alloc(sc->sm, mp, 0, &sc->tp);
if (error)
goto out;
sc->ilock_flags |= XFS_ILOCK_EXCL;
diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c
index f6752e9..f9eadd3 100644
--- a/fs/xfs/scrub/repair.c
+++ b/fs/xfs/scrub/repair.c
@@ -64,3 +64,819 @@ xfs_repair_probe(
return 0;
}
+
+/*
+ * Roll a transaction, keeping the AG headers locked and reinitializing
+ * the btree cursors.
+ */
+int
+xfs_repair_roll_ag_trans(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_trans *tp;
+ int error;
+
+ /* Keep the AG header buffers locked so we can keep going. */
+ xfs_trans_bhold(sc->tp, sc->sa.agi_bp);
+ xfs_trans_bhold(sc->tp, sc->sa.agf_bp);
+ xfs_trans_bhold(sc->tp, sc->sa.agfl_bp);
+
+ /* Roll the transaction. */
+ tp = sc->tp;
+ error = xfs_trans_roll(&sc->tp);
+ if (error)
+ return error;
+
+ /* Join the buffer to the new transaction or release the hold. */
+ if (sc->tp != tp) {
+ xfs_trans_bjoin(sc->tp, sc->sa.agi_bp);
+ xfs_trans_bjoin(sc->tp, sc->sa.agf_bp);
+ xfs_trans_bjoin(sc->tp, sc->sa.agfl_bp);
+ } else {
+ xfs_trans_bhold_release(sc->tp, sc->sa.agi_bp);
+ xfs_trans_bhold_release(sc->tp, sc->sa.agf_bp);
+ xfs_trans_bhold_release(sc->tp, sc->sa.agfl_bp);
+ }
+
+ return error;
+}
+
+/*
+ * Does the given AG have enough space to rebuild a btree? Neither AG
+ * reservation can be critical, and we must have enough space (factoring
+ * in AG reservations) to construct a whole btree.
+ */
+bool
+xfs_repair_ag_has_space(
+ struct xfs_perag *pag,
+ xfs_extlen_t nr_blocks,
+ enum xfs_ag_resv_type type)
+{
+ return !xfs_ag_resv_critical(pag, XFS_AG_RESV_AGFL) &&
+ !xfs_ag_resv_critical(pag, XFS_AG_RESV_METADATA) &&
+ pag->pagf_freeblks > xfs_ag_resv_needed(pag, type) + nr_blocks;
+}
+
+/* Allocate a block in an AG. */
+int
+xfs_repair_alloc_ag_block(
+ struct xfs_scrub_context *sc,
+ struct xfs_owner_info *oinfo,
+ xfs_fsblock_t *fsbno,
+ enum xfs_ag_resv_type resv)
+{
+ struct xfs_alloc_arg args = {0};
+ xfs_agblock_t bno;
+ int error;
+
+ if (resv == XFS_AG_RESV_AGFL) {
+ error = xfs_alloc_get_freelist(sc->tp, sc->sa.agf_bp, &bno, 1);
+ if (error)
+ return error;
+ if (bno == NULLAGBLOCK)
+ return -ENOSPC;
+ xfs_extent_busy_reuse(sc->mp, sc->sa.agno, bno,
+ 1, false);
+ *fsbno = XFS_AGB_TO_FSB(sc->mp, sc->sa.agno, bno);
+ return 0;
+ }
+
+ args.tp = sc->tp;
+ args.mp = sc->mp;
+ args.oinfo = *oinfo;
+ args.fsbno = XFS_AGB_TO_FSB(args.mp, sc->sa.agno, 0);
+ args.minlen = 1;
+ args.maxlen = 1;
+ args.prod = 1;
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.resv = resv;
+
+ error = xfs_alloc_vextent(&args);
+ if (error)
+ return error;
+ if (args.fsbno == NULLFSBLOCK)
+ return -ENOSPC;
+ ASSERT(args.len == 1);
+ *fsbno = args.fsbno;
+
+ return 0;
+}
+
+/* Initialize an AG block to a zeroed out btree header. */
+int
+xfs_repair_init_btblock(
+ struct xfs_scrub_context *sc,
+ xfs_fsblock_t fsb,
+ struct xfs_buf **bpp,
+ xfs_btnum_t btnum,
+ const struct xfs_buf_ops *ops)
+{
+ struct xfs_trans *tp = sc->tp;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *bp;
+
+ trace_xfs_repair_init_btblock(mp, XFS_FSB_TO_AGNO(mp, fsb),
+ XFS_FSB_TO_AGBNO(mp, fsb), btnum);
+
+ ASSERT(XFS_FSB_TO_AGNO(mp, fsb) == sc->sa.agno);
+ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, fsb),
+ XFS_FSB_TO_BB(mp, 1), 0);
+ xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
+ xfs_btree_init_block(mp, bp, btnum, 0, 0, sc->sa.agno,
+ XFS_BTREE_CRC_BLOCKS);
+ xfs_trans_buf_set_type(tp, bp, XFS_BLFT_BTREE_BUF);
+ xfs_trans_log_buf(tp, bp, 0, bp->b_length);
+ bp->b_ops = ops;
+ *bpp = bp;
+
+ return 0;
+}
+
+/* Ensure the freelist is full. */
+int
+xfs_repair_fix_freelist(
+ struct xfs_scrub_context *sc,
+ bool can_shrink)
+{
+ struct xfs_alloc_arg args = {0};
+ int error;
+
+ args.mp = sc->mp;
+ args.tp = sc->tp;
+ args.agno = sc->sa.agno;
+ args.alignment = 1;
+ args.pag = xfs_perag_get(args.mp, sc->sa.agno);
+ args.resv = XFS_AG_RESV_AGFL;
+
+ error = xfs_alloc_fix_freelist(&args,
+ can_shrink ? 0 : XFS_ALLOC_FLAG_NOSHRINK);
+ xfs_perag_put(args.pag);
+
+ return error;
+}
+
+/* Put a block back on the AGFL. */
+int
+xfs_repair_put_freelist(
+ struct xfs_scrub_context *sc,
+ xfs_agblock_t agbno)
+{
+ struct xfs_owner_info oinfo;
+ int error;
+
+ /*
+ * Since we're "freeing" a lost block onto the AGFL, we have to
+ * create an rmap for the block prior to merging it or else other
+ * parts will break.
+ */
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
+ error = xfs_rmap_alloc(sc->tp, sc->sa.agf_bp, sc->sa.agno, agbno, 1,
+ &oinfo);
+ if (error)
+ return error;
+
+ /* Put the block on the AGFL. */
+ error = xfs_alloc_put_freelist(sc->tp, sc->sa.agf_bp, sc->sa.agfl_bp,
+ agbno, 0);
+ if (error)
+ return error;
+ xfs_extent_busy_insert(sc->tp, sc->sa.agno, agbno, 1,
+ XFS_EXTENT_BUSY_SKIP_DISCARD);
+
+ /* Make sure the AGFL doesn't overfill. */
+ return xfs_repair_fix_freelist(sc, true);
+}
+
+/*
+ * For a given metadata extent and owner, delete the associated rmap.
+ * If the block has no other owners, free it.
+ */
+STATIC int
+xfs_repair_free_or_unmap_extent(
+ struct xfs_scrub_context *sc,
+ xfs_fsblock_t fsbno,
+ xfs_extlen_t len,
+ struct xfs_owner_info *oinfo,
+ enum xfs_ag_resv_type resv)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_btree_cur *rmap_cur;
+ struct xfs_buf *agf_bp = NULL;
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+ bool has_other_rmap;
+ int error = 0;
+
+ ASSERT(xfs_sb_version_hasrmapbt(&mp->m_sb));
+ agno = XFS_FSB_TO_AGNO(mp, fsbno);
+ agbno = XFS_FSB_TO_AGBNO(mp, fsbno);
+
+ trace_xfs_repair_free_or_unmap_extent(mp, agno, agbno, len);
+
+ for (; len > 0 && !error; len--, agbno++, fsbno++) {
+ ASSERT(sc->ip != NULL || agno == sc->sa.agno);
+
+ /* Can we find any other rmappings? */
+ if (sc->ip) {
+ error = xfs_alloc_read_agf(mp, sc->tp, agno, 0,
+ &agf_bp);
+ if (error)
+ break;
+ if (!agf_bp) {
+ error = -ENOMEM;
+ break;
+ }
+ }
+ rmap_cur = xfs_rmapbt_init_cursor(mp, sc->tp,
+ agf_bp ? agf_bp : sc->sa.agf_bp, agno);
+ error = xfs_rmap_has_other_keys(rmap_cur, agbno, 1, oinfo,
+ &has_other_rmap);
+ if (error)
+ goto out_cur;
+ xfs_btree_del_cursor(rmap_cur, XFS_BTREE_NOERROR);
+ if (agf_bp)
+ xfs_trans_brelse(sc->tp, agf_bp);
+
+ /*
+ * If there are other rmappings, this block is cross
+ * linked and must not be freed. Remove the reverse
+ * mapping and move on. Otherwise, we were the only
+ * owner of the block, so free the extent, which will
+ * also remove the rmap.
+ */
+ if (has_other_rmap)
+ error = xfs_rmap_free(sc->tp, agf_bp, agno, agbno, 1,
+ oinfo);
+ else if (resv == XFS_AG_RESV_AGFL)
+ error = xfs_repair_put_freelist(sc, agbno);
+ else
+ error = xfs_free_extent(sc->tp, fsbno, 1, oinfo, resv);
+ if (error)
+ break;
+
+ if (sc->ip)
+ error = xfs_trans_roll_inode(&sc->tp, sc->ip);
+ else
+ error = xfs_repair_roll_ag_trans(sc);
+ }
+
+ return error;
+out_cur:
+ xfs_btree_del_cursor(rmap_cur, XFS_BTREE_ERROR);
+ if (agf_bp)
+ xfs_trans_brelse(sc->tp, agf_bp);
+ return error;
+}
+
+/* Collect a dead btree extent for later disposal. */
+int
+xfs_repair_collect_btree_extent(
+ struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *exlist,
+ xfs_fsblock_t fsbno,
+ xfs_extlen_t len)
+{
+ struct xfs_repair_extent *rae;
+
+ trace_xfs_repair_collect_btree_extent(sc->mp,
+ XFS_FSB_TO_AGNO(sc->mp, fsbno),
+ XFS_FSB_TO_AGBNO(sc->mp, fsbno), len);
+
+ rae = kmem_alloc(sizeof(struct xfs_repair_extent),
+ KM_MAYFAIL | KM_NOFS);
+ if (!rae)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&rae->list);
+ rae->fsbno = fsbno;
+ rae->len = len;
+ list_add_tail(&rae->list, &exlist->list);
+
+ return 0;
+}
+
+/* Invalidate buffers for blocks we're dumping. */
+int
+xfs_repair_invalidate_blocks(
+ struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *exlist)
+{
+ struct xfs_repair_extent *rae;
+ struct xfs_repair_extent *n;
+ struct xfs_buf *bp;
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+ xfs_agblock_t i;
+
+ for_each_xfs_repair_extent_safe(rae, n, exlist) {
+ agno = XFS_FSB_TO_AGNO(sc->mp, rae->fsbno);
+ agbno = XFS_FSB_TO_AGBNO(sc->mp, rae->fsbno);
+ for (i = 0; i < rae->len; i++) {
+ bp = xfs_btree_get_bufs(sc->mp, sc->tp, agno,
+ agbno + i, 0);
+ xfs_trans_binval(sc->tp, bp);
+ }
+ }
+
+ return 0;
+}
+
+/* Dispose of dead btree extents. If oinfo is NULL, just delete the list. */
+int
+xfs_repair_reap_btree_extents(
+ struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *exlist,
+ struct xfs_owner_info *oinfo,
+ enum xfs_ag_resv_type type)
+{
+ struct xfs_repair_extent *rae;
+ struct xfs_repair_extent *n;
+ int error = 0;
+
+ for_each_xfs_repair_extent_safe(rae, n, exlist) {
+ if (oinfo) {
+ error = xfs_repair_free_or_unmap_extent(sc, rae->fsbno,
+ rae->len, oinfo, type);
+ if (error)
+ oinfo = NULL;
+ }
+ list_del(&rae->list);
+ kmem_free(rae);
+ }
+
+ return error;
+}
+
+/* Errors happened, just delete the dead btree extent list. */
+void
+xfs_repair_cancel_btree_extents(
+ struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *exlist)
+{
+ xfs_repair_reap_btree_extents(sc, exlist, NULL, XFS_AG_RESV_NONE);
+}
+
+/* Compare two btree extents. */
+static int
+xfs_repair_btree_extent_cmp(
+ void *priv,
+ struct list_head *a,
+ struct list_head *b)
+{
+ struct xfs_repair_extent *ap;
+ struct xfs_repair_extent *bp;
+
+ ap = container_of(a, struct xfs_repair_extent, list);
+ bp = container_of(b, struct xfs_repair_extent, list);
+
+ if (ap->fsbno > bp->fsbno)
+ return 1;
+ else if (ap->fsbno < bp->fsbno)
+ return -1;
+ return 0;
+}
+
+/* Remove all the blocks in sublist from exlist. */
+#define LEFT_CONTIG (1 << 0)
+#define RIGHT_CONTIG (1 << 1)
+int
+xfs_repair_subtract_extents(
+ struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *exlist,
+ struct xfs_repair_extent_list *sublist)
+{
+ struct list_head *lp;
+ struct xfs_repair_extent *ex;
+ struct xfs_repair_extent *newex;
+ struct xfs_repair_extent *subex;
+ xfs_fsblock_t sub_fsb;
+ xfs_extlen_t sub_len;
+ int state;
+ int error = 0;
+
+ if (list_empty(&exlist->list) || list_empty(&sublist->list))
+ return 0;
+ ASSERT(!list_empty(&sublist->list));
+
+ list_sort(NULL, &exlist->list, xfs_repair_btree_extent_cmp);
+ list_sort(NULL, &sublist->list, xfs_repair_btree_extent_cmp);
+
+ subex = list_first_entry(&sublist->list, struct xfs_repair_extent,
+ list);
+ lp = exlist->list.next;
+ while (lp != &exlist->list) {
+ ex = list_entry(lp, struct xfs_repair_extent, list);
+
+ /*
+ * Advance subex and/or ex until we find a pair that
+ * intersect or we run out of extents.
+ */
+ while (subex->fsbno + subex->len <= ex->fsbno) {
+ if (list_is_last(&subex->list, &sublist->list))
+ goto out;
+ subex = list_next_entry(subex, list);
+ }
+ if (subex->fsbno >= ex->fsbno + ex->len) {
+ lp = lp->next;
+ continue;
+ }
+
+ /* trim subex to fit the extent we have */
+ sub_fsb = subex->fsbno;
+ sub_len = subex->len;
+ if (subex->fsbno < ex->fsbno) {
+ sub_len -= ex->fsbno - subex->fsbno;
+ sub_fsb = ex->fsbno;
+ }
+ if (sub_len > ex->len)
+ sub_len = ex->len;
+
+ state = 0;
+ if (sub_fsb == ex->fsbno)
+ state |= LEFT_CONTIG;
+ if (sub_fsb + sub_len == ex->fsbno + ex->len)
+ state |= RIGHT_CONTIG;
+ switch (state) {
+ case LEFT_CONTIG:
+ /* Coincides with only the left. */
+ ex->fsbno += sub_len;
+ ex->len -= sub_len;
+ break;
+ case RIGHT_CONTIG:
+ /* Coincides with only the right. */
+ ex->len -= sub_len;
+ lp = lp->next;
+ break;
+ case LEFT_CONTIG | RIGHT_CONTIG:
+ /* Total overlap, just delete ex. */
+ lp = lp->next;
+ list_del(&ex->list);
+ kmem_free(ex);
+ break;
+ case 0:
+ /*
+ * Deleting from the middle: add the new right extent
+ * and then shrink the left extent.
+ */
+ newex = kmem_alloc(
+ sizeof(struct xfs_repair_extent),
+ KM_MAYFAIL | KM_NOFS);
+ if (!newex) {
+ error = -ENOMEM;
+ goto out;
+ }
+ INIT_LIST_HEAD(&newex->list);
+ newex->fsbno = sub_fsb + sub_len;
+ newex->len = ex->len - (sub_fsb - ex->fsbno) - sub_len;
+ list_add(&newex->list, &ex->list);
+ ex->len = sub_fsb - ex->fsbno;
+ lp = lp->next;
+ break;
+ default:
+ ASSERT(0);
+ break;
+ }
+ }
+
+out:
+ return error;
+}
+#undef LEFT_CONTIG
+#undef RIGHT_CONTIG
+
+struct xfs_repair_find_ag_btree_roots_info {
+ struct xfs_buf *agfl_bp;
+ struct xfs_repair_find_ag_btree *btree_info;
+};
+
+/* Is this an OWN_AG block in the AGFL? */
+STATIC bool
+xfs_repair_is_block_in_agfl(
+ struct xfs_mount *mp,
+ uint64_t rmap_owner,
+ xfs_agblock_t agbno,
+ struct xfs_buf *agf_bp,
+ struct xfs_buf *agfl_bp)
+{
+ struct xfs_agf *agf;
+ __be32 *agfl_bno;
+ unsigned int flfirst;
+ unsigned int fllast;
+ int i;
+
+ if (rmap_owner != XFS_RMAP_OWN_AG)
+ return false;
+
+ agf = XFS_BUF_TO_AGF(agf_bp);
+ agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agfl_bp);
+ flfirst = be32_to_cpu(agf->agf_flfirst);
+ fllast = be32_to_cpu(agf->agf_fllast);
+
+ /* Skip an empty AGFL. */
+ if (agf->agf_flcount == cpu_to_be32(0))
+ return false;
+
+ /* first to last is a consecutive list. */
+ if (fllast >= flfirst) {
+ for (i = flfirst; i <= fllast; i++) {
+ if (be32_to_cpu(agfl_bno[i]) == agbno)
+ return true;
+ }
+
+ return false;
+ }
+
+ /* first to the end */
+ for (i = flfirst; i < xfs_agfl_size(mp); i++) {
+ if (be32_to_cpu(agfl_bno[i]) == agbno)
+ return true;
+ }
+
+ /* the start to last. */
+ for (i = 0; i <= fllast; i++) {
+ if (be32_to_cpu(agfl_bno[i]) == agbno)
+ return true;
+ }
+
+ return false;
+}
+
+/* Find btree roots from the AGF. */
+STATIC int
+xfs_repair_find_ag_btree_roots_helper(
+ struct xfs_btree_cur *cur,
+ struct xfs_rmap_irec *rec,
+ void *priv)
+{
+ struct xfs_mount *mp = cur->bc_mp;
+ struct xfs_repair_find_ag_btree_roots_info *ri = priv;
+ struct xfs_repair_find_ag_btree *fab;
+ struct xfs_buf *bp;
+ struct xfs_btree_block *btblock;
+ xfs_daddr_t daddr;
+ xfs_agblock_t agbno;
+ int error = 0;
+
+ if (!XFS_RMAP_NON_INODE_OWNER(rec->rm_owner))
+ return 0;
+
+ for (agbno = 0; agbno < rec->rm_blockcount; agbno++) {
+ daddr = XFS_AGB_TO_DADDR(mp, cur->bc_private.a.agno,
+ rec->rm_startblock + agbno);
+ for (fab = ri->btree_info; fab->buf_ops; fab++) {
+ if (rec->rm_owner != fab->rmap_owner)
+ continue;
+
+ /*
+ * Blocks in the AGFL have stale contents that
+ * might just happen to have a matching magic
+ * and uuid. We don't want to pull these blocks
+ * in as part of a tree root, so we have to
+ * filter out the AGFL stuff here. If the AGFL
+ * looks insane we'll just refuse to repair.
+ */
+ if (xfs_repair_is_block_in_agfl(mp, rec->rm_owner,
+ rec->rm_startblock + agbno,
+ cur->bc_private.a.agbp, ri->agfl_bp))
+ continue;
+
+ error = xfs_trans_read_buf(mp, cur->bc_tp,
+ mp->m_ddev_targp, daddr, mp->m_bsize,
+ 0, &bp, NULL);
+ if (error)
+ return error;
+
+ /* Does this look like a block we want? */
+ btblock = XFS_BUF_TO_BLOCK(bp);
+ if (be32_to_cpu(btblock->bb_magic) != fab->magic)
+ goto next_fab;
+ if (xfs_sb_version_hascrc(&mp->m_sb) &&
+ !uuid_equal(&btblock->bb_u.s.bb_uuid,
+ &mp->m_sb.sb_meta_uuid))
+ goto next_fab;
+ if (fab->root != NULLAGBLOCK &&
+ xfs_btree_get_level(btblock) <= fab->level)
+ goto next_fab;
+
+ /* Make sure we pass the verifiers. */
+ bp->b_ops = fab->buf_ops;
+ bp->b_ops->verify_read(bp);
+ if (bp->b_error)
+ goto next_fab;
+ fab->root = rec->rm_startblock + agbno;
+ fab->level = xfs_btree_get_level(btblock);
+
+ trace_xfs_repair_find_ag_btree_roots_helper(mp,
+ cur->bc_private.a.agno,
+ rec->rm_startblock + agbno,
+ be32_to_cpu(btblock->bb_magic),
+ fab->level);
+next_fab:
+ xfs_trans_brelse(cur->bc_tp, bp);
+ if (be32_to_cpu(btblock->bb_magic) == fab->magic)
+ break;
+ }
+ }
+
+ return error;
+}
+
+/* Find the roots of the given btrees from the rmap info. */
+int
+xfs_repair_find_ag_btree_roots(
+ struct xfs_scrub_context *sc,
+ struct xfs_buf *agf_bp,
+ struct xfs_repair_find_ag_btree *btree_info,
+ struct xfs_buf *agfl_bp)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_repair_find_ag_btree_roots_info ri;
+ struct xfs_repair_find_ag_btree *fab;
+ struct xfs_btree_cur *cur;
+ int error;
+
+ ri.btree_info = btree_info;
+ ri.agfl_bp = agfl_bp;
+ for (fab = btree_info; fab->buf_ops; fab++) {
+ ASSERT(agfl_bp || fab->rmap_owner != XFS_RMAP_OWN_AG);
+ fab->root = NULLAGBLOCK;
+ fab->level = 0;
+ }
+
+ cur = xfs_rmapbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno);
+ error = xfs_rmap_query_all(cur, xfs_repair_find_ag_btree_roots_helper,
+ &ri);
+ xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+
+ for (fab = btree_info; !error && fab->buf_ops; fab++)
+ if (fab->root != NULLAGBLOCK)
+ fab->level++;
+
+ return error;
+}
+
+/* Reset the superblock counters from the AGF/AGI. */
+int
+xfs_repair_reset_counters(
+ struct xfs_mount *mp)
+{
+ struct xfs_trans *tp;
+ struct xfs_buf *agi_bp;
+ struct xfs_buf *agf_bp;
+ struct xfs_agi *agi;
+ struct xfs_agf *agf;
+ xfs_agnumber_t agno;
+ xfs_ino_t icount = 0;
+ xfs_ino_t ifree = 0;
+ xfs_filblks_t fdblocks = 0;
+ int64_t delta_icount;
+ int64_t delta_ifree;
+ int64_t delta_fdblocks;
+ int error;
+
+ trace_xfs_repair_reset_counters(mp);
+
+ error = xfs_trans_alloc_empty(mp, &tp);
+ if (error)
+ return error;
+
+ for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
+ /* Count all the inodes... */
+ error = xfs_ialloc_read_agi(mp, tp, agno, &agi_bp);
+ if (error)
+ goto out;
+ agi = XFS_BUF_TO_AGI(agi_bp);
+ icount += be32_to_cpu(agi->agi_count);
+ ifree += be32_to_cpu(agi->agi_freecount);
+
+ /* Add up the free/freelist/bnobt/cntbt blocks... */
+ error = xfs_alloc_read_agf(mp, tp, agno, 0, &agf_bp);
+ if (error)
+ goto out;
+ if (!agf_bp) {
+ error = -ENOMEM;
+ goto out;
+ }
+ agf = XFS_BUF_TO_AGF(agf_bp);
+ fdblocks += be32_to_cpu(agf->agf_freeblks);
+ fdblocks += be32_to_cpu(agf->agf_flcount);
+ fdblocks += be32_to_cpu(agf->agf_btreeblks);
+ }
+
+ /*
+ * Reinitialize the counters. The on-disk and in-core counters
+ * differ by the number of inodes/blocks reserved by the admin,
+ * the per-AG reservation, and any transactions in progress, so
+ * we have to account for that.
+ */
+ spin_lock(&mp->m_sb_lock);
+ delta_icount = (int64_t)mp->m_sb.sb_icount - icount;
+ delta_ifree = (int64_t)mp->m_sb.sb_ifree - ifree;
+ delta_fdblocks = (int64_t)mp->m_sb.sb_fdblocks - fdblocks;
+ mp->m_sb.sb_icount = icount;
+ mp->m_sb.sb_ifree = ifree;
+ mp->m_sb.sb_fdblocks = fdblocks;
+ spin_unlock(&mp->m_sb_lock);
+
+ if (delta_icount) {
+ error = xfs_mod_icount(mp, delta_icount);
+ if (error)
+ goto out;
+ }
+ if (delta_ifree) {
+ error = xfs_mod_ifree(mp, delta_ifree);
+ if (error)
+ goto out;
+ }
+ if (delta_fdblocks) {
+ error = xfs_mod_fdblocks(mp, delta_fdblocks, false);
+ if (error)
+ goto out;
+ }
+
+out:
+ xfs_trans_cancel(tp);
+ return error;
+}
+
+/* Figure out how many blocks to reserve for an AG repair. */
+xfs_extlen_t
+xfs_repair_calc_ag_resblks(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_scrub_metadata *sm = sc->sm;
+ struct xfs_agi *agi;
+ struct xfs_agf *agf;
+ struct xfs_buf *bp;
+ xfs_agino_t icount;
+ xfs_extlen_t aglen;
+ xfs_extlen_t usedlen;
+ xfs_extlen_t freelen;
+ xfs_extlen_t bnobt_sz;
+ xfs_extlen_t inobt_sz;
+ xfs_extlen_t rmapbt_sz;
+ xfs_extlen_t refcbt_sz;
+ int error;
+
+ if (!(sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR))
+ return 0;
+
+ /*
+ * Try to get the actual counters from disk; if not, make
+ * some worst case assumptions.
+ */
+ error = xfs_read_agi(mp, NULL, sm->sm_agno, &bp);
+ if (!error) {
+ agi = XFS_BUF_TO_AGI(bp);
+ icount = be32_to_cpu(agi->agi_count);
+ xfs_trans_brelse(NULL, bp);
+ } else {
+ icount = mp->m_sb.sb_agblocks / mp->m_sb.sb_inopblock;
+ }
+
+ error = xfs_alloc_read_agf(mp, NULL, sm->sm_agno, 0, &bp);
+ if (!error && bp) {
+ agf = XFS_BUF_TO_AGF(bp);
+ aglen = be32_to_cpu(agf->agf_length);
+ freelen = be32_to_cpu(agf->agf_freeblks);
+ usedlen = aglen - freelen;
+ xfs_trans_brelse(NULL, bp);
+ } else {
+ aglen = mp->m_sb.sb_agblocks;
+ freelen = aglen;
+ usedlen = aglen;
+ }
+
+ trace_xfs_repair_calc_ag_resblks(mp, sm->sm_agno, icount, aglen,
+ freelen, usedlen);
+
+ /*
+ * Figure out how many blocks we'd need worst case to rebuild
+ * each type of btree. Note that we can only rebuild the
+ * bnobt/cntbt or inobt/finobt as pairs.
+ */
+ bnobt_sz = 2 * xfs_allocbt_calc_size(mp, freelen);
+ if (xfs_sb_version_hassparseinodes(&mp->m_sb))
+ inobt_sz = xfs_iallocbt_calc_size(mp, icount /
+ XFS_INODES_PER_HOLEMASK_BIT);
+ else
+ inobt_sz = xfs_iallocbt_calc_size(mp, icount /
+ XFS_INODES_PER_CHUNK);
+ if (xfs_sb_version_hasfinobt(&mp->m_sb))
+ inobt_sz *= 2;
+ if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+ rmapbt_sz = xfs_rmapbt_calc_size(mp, aglen);
+ refcbt_sz = xfs_refcountbt_calc_size(mp, usedlen);
+ } else {
+ rmapbt_sz = xfs_rmapbt_calc_size(mp, usedlen);
+ refcbt_sz = 0;
+ }
+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+ rmapbt_sz = 0;
+
+ trace_xfs_repair_calc_ag_resblks_btsize(mp, sm->sm_agno, bnobt_sz,
+ inobt_sz, rmapbt_sz, refcbt_sz);
+
+ return max(max(bnobt_sz, inobt_sz), max(rmapbt_sz, refcbt_sz));
+}
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index b9f2c0e..8cb233e 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -39,11 +39,98 @@ static inline bool xfs_repair_should_fix(struct xfs_scrub_metadata *sm)
int xfs_repair_probe(struct xfs_scrub_context *sc, uint32_t scrub_oflags);
+/* Are we here only for preening? */
+static inline bool xfs_repair_preen_only(uint32_t scrub_oflags)
+{
+ return !(scrub_oflags & XFS_SCRUB_OFLAG_CORRUPT) &&
+ !(scrub_oflags & XFS_SCRUB_OFLAG_XCORRUPT) &&
+ (scrub_oflags & XFS_SCRUB_OFLAG_PREEN);
+}
+
+/* Repair helpers */
+
+struct xfs_repair_find_ag_btree {
+ uint64_t rmap_owner;
+ const struct xfs_buf_ops *buf_ops;
+ uint32_t magic;
+ xfs_agblock_t root;
+ unsigned int level;
+};
+
+struct xfs_repair_extent {
+ struct list_head list;
+ xfs_fsblock_t fsbno;
+ xfs_extlen_t len;
+};
+
+struct xfs_repair_extent_list {
+ struct list_head list;
+};
+
+static inline void
+xfs_repair_init_extent_list(
+ struct xfs_repair_extent_list *exlist)
+{
+ INIT_LIST_HEAD(&exlist->list);
+}
+
+#define for_each_xfs_repair_extent_safe(rbe, n, exlist) \
+ list_for_each_entry_safe((rbe), (n), &(exlist)->list, list)
+
+int xfs_repair_roll_ag_trans(struct xfs_scrub_context *sc);
+bool xfs_repair_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
+ enum xfs_ag_resv_type type);
+int xfs_repair_alloc_ag_block(struct xfs_scrub_context *sc,
+ struct xfs_owner_info *oinfo, xfs_fsblock_t *fsbno,
+ enum xfs_ag_resv_type resv);
+int xfs_repair_init_btblock(struct xfs_scrub_context *sc, xfs_fsblock_t fsb,
+ struct xfs_buf **bpp, xfs_btnum_t btnum,
+ const struct xfs_buf_ops *ops);
+int xfs_repair_fix_freelist(struct xfs_scrub_context *sc, bool can_shrink);
+int xfs_repair_put_freelist(struct xfs_scrub_context *sc, xfs_agblock_t agbno);
+int xfs_repair_collect_btree_extent(struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *btlist, xfs_fsblock_t fsbno,
+ xfs_extlen_t len);
+int xfs_repair_invalidate_blocks(struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *btlist);
+int xfs_repair_reap_btree_extents(struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *btlist,
+ struct xfs_owner_info *oinfo, enum xfs_ag_resv_type type);
+void xfs_repair_cancel_btree_extents(struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *btlist);
+int xfs_repair_subtract_extents(struct xfs_scrub_context *sc,
+ struct xfs_repair_extent_list *exlist,
+ struct xfs_repair_extent_list *sublist);
+int xfs_repair_find_ag_btree_roots(struct xfs_scrub_context *sc,
+ struct xfs_buf *agf_bp,
+ struct xfs_repair_find_ag_btree *btree_info,
+ struct xfs_buf *agfl_bp);
+int xfs_repair_reset_counters(struct xfs_mount *mp);
+xfs_extlen_t xfs_repair_calc_ag_resblks(struct xfs_scrub_context *sc);
+int xfs_repair_setup_btree_extent_collection(struct xfs_scrub_context *sc);
+
+/* Metadata repairers */
+
#else
+static inline int xfs_repair_fail(void *p)
+{
+ ASSERT(0);
+ return -EIO;
+}
+
+static inline xfs_extlen_t
+xfs_repair_calc_ag_resblks(
+ struct xfs_scrub_context *sc)
+{
+ ASSERT(!(sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR));
+ return 0;
+}
+
# define xfs_repair_can_fix(mp) (false)
# define xfs_repair_should_fix(sm) (false)
# define xfs_repair_probe (NULL)
+# define xfs_repair_reset_counters xfs_repair_fail
#endif /* IS_ENABLED(CONFIG_XFS_ONLINE_REPAIR) */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 64003dc..ad1eb55 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -196,6 +196,8 @@ xfs_scrub_teardown(
kmem_free(sc->buf);
sc->buf = NULL;
}
+ if (sc->reset_counters && !error)
+ error = xfs_repair_reset_counters(sc->mp);
return error;
}
diff --git a/fs/xfs/scrub/scrub.h b/fs/xfs/scrub/scrub.h
index 9c3d345..c17de96 100644
--- a/fs/xfs/scrub/scrub.h
+++ b/fs/xfs/scrub/scrub.h
@@ -80,6 +80,7 @@ struct xfs_scrub_context {
void *buf;
uint ilock_flags;
bool try_harder;
+ bool reset_counters;
/* State tracking for single-AG operations. */
struct xfs_scrub_ag sa;
--
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