[PATCH 12/24] xfs: repair the AGI

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From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Rebuild the AGI header items with some help from the rmapbt.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/scrub/agheader_repair.c |  111 ++++++++++++++++++++++++++++++++++++++++
 fs/xfs/scrub/repair.h          |    2 +
 fs/xfs/scrub/scrub.c           |    2 -
 3 files changed, 114 insertions(+), 1 deletion(-)


diff --git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index 6958c36..8c35d03 100644
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -565,3 +565,114 @@ xfs_repair_agfl(
 				XFS_BTREE_NOERROR);
 	return error;
 }
+
+/* AGI */
+
+int
+xfs_repair_agi(
+	struct xfs_scrub_context	*sc)
+{
+	struct xfs_repair_find_ag_btree	fab[] = {
+		{
+			.rmap_owner = XFS_RMAP_OWN_INOBT,
+			.buf_ops = &xfs_inobt_buf_ops,
+			.magic = XFS_IBT_CRC_MAGIC,
+		},
+		{
+			.rmap_owner = XFS_RMAP_OWN_INOBT,
+			.buf_ops = &xfs_inobt_buf_ops,
+			.magic = XFS_FIBT_CRC_MAGIC,
+		},
+		{
+			.buf_ops = NULL
+		},
+	};
+	struct xfs_agi			old_agi;
+	struct xfs_mount		*mp = sc->mp;
+	struct xfs_buf			*agi_bp;
+	struct xfs_buf			*agf_bp;
+	struct xfs_agi			*agi;
+	struct xfs_btree_cur		*cur;
+	struct xfs_perag		*pag;
+	xfs_agino_t			old_count;
+	xfs_agino_t			old_freecount;
+	xfs_agino_t			count;
+	xfs_agino_t			freecount;
+	int				bucket;
+	int				error;
+
+	/* We require the rmapbt to rebuild anything. */
+	if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+		return -EOPNOTSUPP;
+
+	error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+			XFS_AG_DADDR(mp, sc->sa.agno, XFS_AGI_DADDR(mp)),
+			XFS_FSS_TO_BB(mp, 1), 0, &agi_bp, NULL);
+	if (error)
+		return error;
+	agi_bp->b_ops = &xfs_agi_buf_ops;
+
+	error = xfs_alloc_read_agf(mp, sc->tp, sc->sa.agno, 0, &agf_bp);
+	if (error)
+		return error;
+	if (!agf_bp)
+		return -ENOMEM;
+
+	/* Find the btree roots. */
+	error = xfs_repair_find_ag_btree_roots(sc, agf_bp, fab, NULL);
+	if (error)
+		return error;
+	if (fab[0].root == NULLAGBLOCK || fab[0].height > XFS_BTREE_MAXLEVELS)
+		return -EFSCORRUPTED;
+	if (xfs_sb_version_hasfinobt(&mp->m_sb) &&
+	    (fab[1].root == NULLAGBLOCK || fab[1].height > XFS_BTREE_MAXLEVELS))
+		return -EFSCORRUPTED;
+
+	/* Start rewriting the header. */
+	agi = XFS_BUF_TO_AGI(agi_bp);
+	old_agi = *agi;
+	old_count = be32_to_cpu(old_agi.agi_count);
+	old_freecount = be32_to_cpu(old_agi.agi_freecount);
+	memset(agi, 0, mp->m_sb.sb_sectsize);
+	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
+	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
+	agi->agi_seqno = cpu_to_be32(sc->sa.agno);
+	agi->agi_length = cpu_to_be32(xfs_ag_block_count(mp, sc->sa.agno));
+	agi->agi_newino = cpu_to_be32(NULLAGINO);
+	agi->agi_dirino = cpu_to_be32(NULLAGINO);
+	if (xfs_sb_version_hascrc(&mp->m_sb))
+		uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
+	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
+		agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
+	agi->agi_root = cpu_to_be32(fab[0].root);
+	agi->agi_level = cpu_to_be32(fab[0].height);
+	if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
+		agi->agi_free_root = cpu_to_be32(fab[1].root);
+		agi->agi_free_level = cpu_to_be32(fab[1].height);
+	}
+
+	/* Update the AGI counters. */
+	cur = xfs_inobt_init_cursor(mp, sc->tp, agi_bp, sc->sa.agno,
+			XFS_BTNUM_INO);
+	error = xfs_ialloc_count_inodes(cur, &count, &freecount);
+	xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+	if (error)
+		goto err;
+	agi->agi_count = cpu_to_be32(count);
+	agi->agi_freecount = cpu_to_be32(freecount);
+	if (old_count != count || old_freecount != freecount) {
+		pag = xfs_perag_get(mp, sc->sa.agno);
+		pag->pagi_init = 0;
+		xfs_perag_put(pag);
+		sc->reset_counters = true;
+	}
+
+	/* Write this to disk. */
+	xfs_trans_buf_set_type(sc->tp, agi_bp, XFS_BLFT_AGI_BUF);
+	xfs_trans_log_buf(sc->tp, agi_bp, 0, mp->m_sb.sb_sectsize - 1);
+	return error;
+
+err:
+	*agi = old_agi;
+	return error;
+}
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index 8c19136..9a22428 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -106,6 +106,7 @@ int xfs_repair_probe(struct xfs_scrub_context *sc);
 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);
 
 #else
 
@@ -137,6 +138,7 @@ static inline int xfs_repair_reset_counters(struct xfs_mount *mp)
 #define xfs_repair_superblock		xfs_repair_notsupported
 #define xfs_repair_agf			xfs_repair_notsupported
 #define xfs_repair_agfl			xfs_repair_notsupported
+#define xfs_repair_agi			xfs_repair_notsupported
 
 #endif /* CONFIG_XFS_ONLINE_REPAIR */
 
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index ee9cb33..b4fb805 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -236,7 +236,7 @@ static const struct xfs_scrub_meta_ops meta_scrub_ops[] = {
 		.type	= ST_PERAG,
 		.setup	= xfs_scrub_setup_fs,
 		.scrub	= xfs_scrub_agi,
-		.repair	= xfs_repair_notsupported,
+		.repair	= xfs_repair_agi,
 	},
 	[XFS_SCRUB_TYPE_BNOBT] = {	/* bnobt */
 		.type	= ST_PERAG,

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