xfs: const-ify xfs_owner_info arguments

Only certain functions actually change the contents of an
xfs_owner_info; the rest can accept a const struct pointer.  This will
enable us to save stack space by hoisting static owner info types to
be const global variables.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

9 files changed, 94 insertions, 91 deletions

diff --git a/fs/xfs/scrub/btree.c b/fs/xfs/scrub/btree.c
index 4ae959f7ad2c..6f94d1f7322d 100644
--- a/fs/xfs/scrub/btree.c
+++ b/fs/xfs/scrub/btree.c
@@ -583,31 +583,32 @@ xchk_btree_block_keys(
  */
 int
 xchk_btree(
-	struct xfs_scrub	*sc,
-	struct xfs_btree_cur	*cur,
-	xchk_btree_rec_fn	scrub_fn,
-	struct xfs_owner_info	*oinfo,
-	void			*private)
+	struct xfs_scrub		*sc,
+	struct xfs_btree_cur		*cur,
+	xchk_btree_rec_fn		scrub_fn,
+	const struct xfs_owner_info	*oinfo,
+	void				*private)
 {
-	struct xchk_btree	bs = { NULL };
-	union xfs_btree_ptr	ptr;
-	union xfs_btree_ptr	*pp;
-	union xfs_btree_rec	*recp;
-	struct xfs_btree_block	*block;
-	int			level;
-	struct xfs_buf		*bp;
-	struct check_owner	*co;
-	struct check_owner	*n;
-	int			i;
-	int			error = 0;
+	struct xchk_btree		bs = {
+		.cur			= cur,
+		.scrub_rec		= scrub_fn,
+		.oinfo			= oinfo,
+		.firstrec		= true,
+		.private		= private,
+		.sc			= sc,
+	};
+	union xfs_btree_ptr		ptr;
+	union xfs_btree_ptr		*pp;
+	union xfs_btree_rec		*recp;
+	struct xfs_btree_block		*block;
+	int				level;
+	struct xfs_buf			*bp;
+	struct check_owner		*co;
+	struct check_owner		*n;
+	int				i;
+	int				error = 0;
 
 	/* Initialize scrub state */
-	bs.cur = cur;
-	bs.scrub_rec = scrub_fn;
-	bs.oinfo = oinfo;
-	bs.firstrec = true;
-	bs.private = private;
-	bs.sc = sc;
 	for (i = 0; i < XFS_BTREE_MAXLEVELS; i++)
 		bs.firstkey[i] = true;
 	INIT_LIST_HEAD(&bs.to_check);
diff --git a/fs/xfs/scrub/btree.h b/fs/xfs/scrub/btree.h
index aada763cd006..5572e475f8ed 100644
--- a/fs/xfs/scrub/btree.h
+++ b/fs/xfs/scrub/btree.h
@@ -31,21 +31,21 @@ typedef int (*xchk_btree_rec_fn)(
 
 struct xchk_btree {
 	/* caller-provided scrub state */
-	struct xfs_scrub	*sc;
-	struct xfs_btree_cur	*cur;
-	xchk_btree_rec_fn	scrub_rec;
-	struct xfs_owner_info	*oinfo;
-	void			*private;
+	struct xfs_scrub		*sc;
+	struct xfs_btree_cur		*cur;
+	xchk_btree_rec_fn		scrub_rec;
+	const struct xfs_owner_info	*oinfo;
+	void				*private;
 
 	/* internal scrub state */
-	union xfs_btree_rec	lastrec;
-	bool			firstrec;
-	union xfs_btree_key	lastkey[XFS_BTREE_MAXLEVELS];
-	bool			firstkey[XFS_BTREE_MAXLEVELS];
-	struct list_head	to_check;
+	union xfs_btree_rec		lastrec;
+	bool				firstrec;
+	union xfs_btree_key		lastkey[XFS_BTREE_MAXLEVELS];
+	bool				firstkey[XFS_BTREE_MAXLEVELS];
+	struct list_head		to_check;
 };
 int xchk_btree(struct xfs_scrub *sc, struct xfs_btree_cur *cur,
-		xchk_btree_rec_fn scrub_fn, struct xfs_owner_info *oinfo,
+		xchk_btree_rec_fn scrub_fn, const struct xfs_owner_info *oinfo,
 		void *private);
 
 #endif /* __XFS_SCRUB_BTREE_H__ */
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index 346b02abccf7..0c54ff55b901 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -313,8 +313,8 @@ xchk_set_incomplete(
  */
 
 struct xchk_rmap_ownedby_info {
-	struct xfs_owner_info	*oinfo;
-	xfs_filblks_t		*blocks;
+	const struct xfs_owner_info	*oinfo;
+	xfs_filblks_t			*blocks;
 };
 
 STATIC int
@@ -347,15 +347,15 @@ int
 xchk_count_rmap_ownedby_ag(
 	struct xfs_scrub		*sc,
 	struct xfs_btree_cur		*cur,
-	struct xfs_owner_info		*oinfo,
+	const struct xfs_owner_info	*oinfo,
 	xfs_filblks_t			*blocks)
 {
-	struct xchk_rmap_ownedby_info	sroi;
+	struct xchk_rmap_ownedby_info	sroi = {
+		.oinfo			= oinfo,
+		.blocks			= blocks,
+	};
 
-	sroi.oinfo = oinfo;
 	*blocks = 0;
-	sroi.blocks = blocks;
-
 	return xfs_rmap_query_all(cur, xchk_count_rmap_ownedby_irec,
 			&sroi);
 }
diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
index 2d4324d12f9a..e26a430bd466 100644
--- a/fs/xfs/scrub/common.h
+++ b/fs/xfs/scrub/common.h
@@ -116,7 +116,7 @@ int xchk_ag_read_headers(struct xfs_scrub *sc, xfs_agnumber_t agno,
 void xchk_ag_btcur_free(struct xchk_ag *sa);
 int xchk_ag_btcur_init(struct xfs_scrub *sc, struct xchk_ag *sa);
 int xchk_count_rmap_ownedby_ag(struct xfs_scrub *sc, struct xfs_btree_cur *cur,
-		struct xfs_owner_info *oinfo, xfs_filblks_t *blocks);
+		const struct xfs_owner_info *oinfo, xfs_filblks_t *blocks);
 
 int xchk_setup_ag_btree(struct xfs_scrub *sc, struct xfs_inode *ip,
 		bool force_log);
diff --git a/fs/xfs/scrub/refcount.c b/fs/xfs/scrub/refcount.c
index e8c82b026083..b7ade620acee 100644
--- a/fs/xfs/scrub/refcount.c
+++ b/fs/xfs/scrub/refcount.c
@@ -383,9 +383,9 @@ xchk_refcountbt_rec(
 STATIC void
 xchk_refcount_xref_rmap(
 	struct xfs_scrub	*sc,
-	struct xfs_owner_info	*oinfo,
 	xfs_filblks_t		cow_blocks)
 {
+	struct xfs_owner_info	oinfo;
 	xfs_extlen_t		refcbt_blocks = 0;
 	xfs_filblks_t		blocks;
 	int			error;
@@ -394,10 +394,11 @@ xchk_refcount_xref_rmap(
 		return;
 
 	/* Check that we saw as many refcbt blocks as the rmap knows about. */
+	xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC);
 	error = xfs_btree_count_blocks(sc->sa.refc_cur, &refcbt_blocks);
 	if (!xchk_btree_process_error(sc, sc->sa.refc_cur, 0, &error))
 		return;
-	error = xchk_count_rmap_ownedby_ag(sc, sc->sa.rmap_cur, oinfo,
+	error = xchk_count_rmap_ownedby_ag(sc, sc->sa.rmap_cur, &oinfo,
 			&blocks);
 	if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
 		return;
@@ -405,8 +406,8 @@ xchk_refcount_xref_rmap(
 		xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
 
 	/* Check that we saw as many cow blocks as the rmap knows about. */
-	xfs_rmap_ag_owner(oinfo, XFS_RMAP_OWN_COW);
-	error = xchk_count_rmap_ownedby_ag(sc, sc->sa.rmap_cur, oinfo,
+	xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_COW);
+	error = xchk_count_rmap_ownedby_ag(sc, sc->sa.rmap_cur, &oinfo,
 			&blocks);
 	if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
 		return;
@@ -429,7 +430,7 @@ xchk_refcountbt(
 	if (error)
 		return error;
 
-	xchk_refcount_xref_rmap(sc, &oinfo, cow_blocks);
+	xchk_refcount_xref_rmap(sc, cow_blocks);
 
 	return 0;
 }
diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c
index 4fc0a5ea7673..90ae9e173de7 100644
--- a/fs/xfs/scrub/repair.c
+++ b/fs/xfs/scrub/repair.c
@@ -299,14 +299,14 @@ xrep_calc_ag_resblks(
 /* Allocate a block in an AG. */
 int
 xrep_alloc_ag_block(
-	struct xfs_scrub	*sc,
-	struct xfs_owner_info	*oinfo,
-	xfs_fsblock_t		*fsbno,
-	enum xfs_ag_resv_type	resv)
+	struct xfs_scrub		*sc,
+	const 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;
+	struct xfs_alloc_arg		args = {0};
+	xfs_agblock_t			bno;
+	int				error;
 
 	switch (resv) {
 	case XFS_AG_RESV_AGFL:
@@ -538,17 +538,17 @@ xrep_put_freelist(
 /* Dispose of a single block. */
 STATIC int
 xrep_reap_block(
-	struct xfs_scrub	*sc,
-	xfs_fsblock_t		fsbno,
-	struct xfs_owner_info	*oinfo,
-	enum xfs_ag_resv_type	resv)
+	struct xfs_scrub		*sc,
+	xfs_fsblock_t			fsbno,
+	const struct xfs_owner_info	*oinfo,
+	enum xfs_ag_resv_type		resv)
 {
-	struct xfs_btree_cur	*cur;
-	struct xfs_buf		*agf_bp = NULL;
-	xfs_agnumber_t		agno;
-	xfs_agblock_t		agbno;
-	bool			has_other_rmap;
-	int			error;
+	struct xfs_btree_cur		*cur;
+	struct xfs_buf			*agf_bp = NULL;
+	xfs_agnumber_t			agno;
+	xfs_agblock_t			agbno;
+	bool				has_other_rmap;
+	int				error;
 
 	agno = XFS_FSB_TO_AGNO(sc->mp, fsbno);
 	agbno = XFS_FSB_TO_AGBNO(sc->mp, fsbno);
@@ -612,15 +612,15 @@ out_free:
 /* Dispose of every block of every extent in the bitmap. */
 int
 xrep_reap_extents(
-	struct xfs_scrub	*sc,
-	struct xfs_bitmap	*bitmap,
-	struct xfs_owner_info	*oinfo,
-	enum xfs_ag_resv_type	type)
+	struct xfs_scrub		*sc,
+	struct xfs_bitmap		*bitmap,
+	const struct xfs_owner_info	*oinfo,
+	enum xfs_ag_resv_type		type)
 {
-	struct xfs_bitmap_range	*bmr;
-	struct xfs_bitmap_range	*n;
-	xfs_fsblock_t		fsbno;
-	int			error = 0;
+	struct xfs_bitmap_range		*bmr;
+	struct xfs_bitmap_range		*n;
+	xfs_fsblock_t			fsbno;
+	int				error = 0;
 
 	ASSERT(xfs_sb_version_hasrmapbt(&sc->mp->m_sb));
 
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index 9de321eee4ab..f2fc18bb7605 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -21,8 +21,9 @@ int xrep_roll_ag_trans(struct xfs_scrub *sc);
 bool xrep_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
 		enum xfs_ag_resv_type type);
 xfs_extlen_t xrep_calc_ag_resblks(struct xfs_scrub *sc);
-int xrep_alloc_ag_block(struct xfs_scrub *sc, struct xfs_owner_info *oinfo,
-		xfs_fsblock_t *fsbno, enum xfs_ag_resv_type resv);
+int xrep_alloc_ag_block(struct xfs_scrub *sc,
+		const struct xfs_owner_info *oinfo, xfs_fsblock_t *fsbno,
+		enum xfs_ag_resv_type resv);
 int xrep_init_btblock(struct xfs_scrub *sc, xfs_fsblock_t fsb,
 		struct xfs_buf **bpp, xfs_btnum_t btnum,
 		const struct xfs_buf_ops *ops);
@@ -32,7 +33,7 @@ struct xfs_bitmap;
 int xrep_fix_freelist(struct xfs_scrub *sc, bool can_shrink);
 int xrep_invalidate_blocks(struct xfs_scrub *sc, struct xfs_bitmap *btlist);
 int xrep_reap_extents(struct xfs_scrub *sc, struct xfs_bitmap *exlist,
-		struct xfs_owner_info *oinfo, enum xfs_ag_resv_type type);
+		const struct xfs_owner_info *oinfo, enum xfs_ag_resv_type type);
 
 struct xrep_find_ag_btree {
 	/* in: rmap owner of the btree we're looking for */
diff --git a/fs/xfs/scrub/rmap.c b/fs/xfs/scrub/rmap.c
index 5e293c129813..8a5bf15d544d 100644
--- a/fs/xfs/scrub/rmap.c
+++ b/fs/xfs/scrub/rmap.c
@@ -184,14 +184,14 @@ xchk_rmapbt(
 /* xref check that the extent is owned by a given owner */
 static inline void
 xchk_xref_check_owner(
-	struct xfs_scrub	*sc,
-	xfs_agblock_t		bno,
-	xfs_extlen_t		len,
-	struct xfs_owner_info	*oinfo,
-	bool			should_have_rmap)
+	struct xfs_scrub		*sc,
+	xfs_agblock_t			bno,
+	xfs_extlen_t			len,
+	const struct xfs_owner_info	*oinfo,
+	bool				should_have_rmap)
 {
-	bool			has_rmap;
-	int			error;
+	bool				has_rmap;
+	int				error;
 
 	if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm))
 		return;
@@ -207,10 +207,10 @@ xchk_xref_check_owner(
 /* xref check that the extent is owned by a given owner */
 void
 xchk_xref_is_owned_by(
-	struct xfs_scrub	*sc,
-	xfs_agblock_t		bno,
-	xfs_extlen_t		len,
-	struct xfs_owner_info	*oinfo)
+	struct xfs_scrub		*sc,
+	xfs_agblock_t			bno,
+	xfs_extlen_t			len,
+	const struct xfs_owner_info	*oinfo)
 {
 	xchk_xref_check_owner(sc, bno, len, oinfo, true);
 }
@@ -218,10 +218,10 @@ xchk_xref_is_owned_by(
 /* xref check that the extent is not owned by a given owner */
 void
 xchk_xref_is_not_owned_by(
-	struct xfs_scrub	*sc,
-	xfs_agblock_t		bno,
-	xfs_extlen_t		len,
-	struct xfs_owner_info	*oinfo)
+	struct xfs_scrub		*sc,
+	xfs_agblock_t			bno,
+	xfs_extlen_t			len,
+	const struct xfs_owner_info	*oinfo)
 {
 	xchk_xref_check_owner(sc, bno, len, oinfo, false);
 }
diff --git a/fs/xfs/scrub/scrub.h b/fs/xfs/scrub/scrub.h
index af323b229c4b..22f754fba8e5 100644
--- a/fs/xfs/scrub/scrub.h
+++ b/fs/xfs/scrub/scrub.h
@@ -122,9 +122,9 @@ void xchk_xref_is_not_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno,
 void xchk_xref_is_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno,
 		xfs_extlen_t len);
 void xchk_xref_is_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno,
-		xfs_extlen_t len, struct xfs_owner_info *oinfo);
+		xfs_extlen_t len, const struct xfs_owner_info *oinfo);
 void xchk_xref_is_not_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno,
-		xfs_extlen_t len, struct xfs_owner_info *oinfo);
+		xfs_extlen_t len, const struct xfs_owner_info *oinfo);
 void xchk_xref_has_no_owner(struct xfs_scrub *sc, xfs_agblock_t agbno,
 		xfs_extlen_t len);
 void xchk_xref_is_cow_staging(struct xfs_scrub *sc, xfs_agblock_t bno,