xfs: use active perag references for inode allocation

Convert the inode allocation routines to use active perag references
or references held by callers rather than grab their own. Also drive
the perag further inwards to replace xfs_mounts when doing
operations on a specific AG.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_ag.c

@@ -925,8 +925,7 @@ xfs_ag_shrink_space(
 	 * Make sure that the last inode cluster cannot overlap with the new
 	 * end of the AG, even if it's sparse.
 	 */
-	error = xfs_ialloc_check_shrink(*tpp, pag->pag_agno, agibp,
-			aglen - delta);
+	error = xfs_ialloc_check_shrink(pag, *tpp, agibp, aglen - delta);
 	if (error)
 		return error;
 

fs/xfs/libxfs/xfs_ialloc.c

@@ -169,14 +169,14 @@ xfs_inobt_insert_rec(
  */
 STATIC int
 xfs_inobt_insert(
-	struct xfs_mount	*mp,
+	struct xfs_perag	*pag,
 	struct xfs_trans	*tp,
 	struct xfs_buf		*agbp,
-	struct xfs_perag	*pag,
 	xfs_agino_t		newino,
 	xfs_agino_t		newlen,
 	xfs_btnum_t		btnum)
 {
+	struct xfs_mount	*mp = pag->pag_mount;
 	struct xfs_btree_cur	*cur;
 	xfs_agino_t		thisino;
 	int			i;
@@ -514,14 +514,14 @@ __xfs_inobt_rec_merge(
  */
 STATIC int
 xfs_inobt_insert_sprec(
-	struct xfs_mount		*mp,
+	struct xfs_perag		*pag,
 	struct xfs_trans		*tp,
 	struct xfs_buf			*agbp,
-	struct xfs_perag		*pag,
 	int				btnum,
 	struct xfs_inobt_rec_incore	*nrec,	/* in/out: new/merged rec. */
 	bool				merge)	/* merge or replace */
 {
+	struct xfs_mount		*mp = pag->pag_mount;
 	struct xfs_btree_cur		*cur;
 	int				error;
 	int				i;
@@ -609,9 +609,9 @@ xfs_inobt_insert_sprec(
  */
 STATIC int
 xfs_ialloc_ag_alloc(
+	struct xfs_perag	*pag,
 	struct xfs_trans	*tp,
-	struct xfs_buf		*agbp,
-	struct xfs_perag	*pag)
+	struct xfs_buf		*agbp)
 {
 	struct xfs_agi		*agi;
 	struct xfs_alloc_arg	args;
@@ -831,7 +831,7 @@ xfs_ialloc_ag_alloc(
 		 * if necessary. If a merge does occur, rec is updated to the
 		 * merged record.
 		 */
-		error = xfs_inobt_insert_sprec(args.mp, tp, agbp, pag,
+		error = xfs_inobt_insert_sprec(pag, tp, agbp,
 				XFS_BTNUM_INO, &rec, true);
 		if (error == -EFSCORRUPTED) {
 			xfs_alert(args.mp,
@@ -856,20 +856,20 @@ xfs_ialloc_ag_alloc(
 		 * existing record with this one.
 		 */
 		if (xfs_has_finobt(args.mp)) {
-			error = xfs_inobt_insert_sprec(args.mp, tp, agbp, pag,
+			error = xfs_inobt_insert_sprec(pag, tp, agbp,
 				       XFS_BTNUM_FINO, &rec, false);
 			if (error)
 				return error;
 		}
 	} else {
 		/* full chunk - insert new records to both btrees */
-		error = xfs_inobt_insert(args.mp, tp, agbp, pag, newino, newlen,
+		error = xfs_inobt_insert(pag, tp, agbp, newino, newlen,
 					 XFS_BTNUM_INO);
 		if (error)
 			return error;
 
 		if (xfs_has_finobt(args.mp)) {
-			error = xfs_inobt_insert(args.mp, tp, agbp, pag, newino,
+			error = xfs_inobt_insert(pag, tp, agbp, newino,
 						 newlen, XFS_BTNUM_FINO);
 			if (error)
 				return error;
@@ -981,9 +981,9 @@ xfs_inobt_first_free_inode(
  */
 STATIC int
 xfs_dialloc_ag_inobt(
+	struct xfs_perag	*pag,
 	struct xfs_trans	*tp,
 	struct xfs_buf		*agbp,
-	struct xfs_perag	*pag,
 	xfs_ino_t		parent,
 	xfs_ino_t		*inop)
 {
@@ -1429,9 +1429,9 @@ xfs_dialloc_ag_update_inobt(
  */
 static int
 xfs_dialloc_ag(
+	struct xfs_perag	*pag,
 	struct xfs_trans	*tp,
 	struct xfs_buf		*agbp,
-	struct xfs_perag	*pag,
 	xfs_ino_t		parent,
 	xfs_ino_t		*inop)
 {
@@ -1448,7 +1448,7 @@ xfs_dialloc_ag(
 	int				i;
 
 	if (!xfs_has_finobt(mp))
-		return xfs_dialloc_ag_inobt(tp, agbp, pag, parent, inop);
+		return xfs_dialloc_ag_inobt(pag, tp, agbp, parent, inop);
 
 	/*
 	 * If pagino is 0 (this is the root inode allocation) use newino.
@@ -1594,8 +1594,8 @@ xfs_ialloc_next_ag(
 
 static bool
 xfs_dialloc_good_ag(
-	struct xfs_trans	*tp,
 	struct xfs_perag	*pag,
+	struct xfs_trans	*tp,
 	umode_t			mode,
 	int			flags,
 	bool			ok_alloc)
@@ -1606,6 +1606,8 @@ xfs_dialloc_good_ag(
 	int			needspace;
 	int			error;
 
+	if (!pag)
+		return false;
 	if (!pag->pagi_inodeok)
 		return false;
 
@@ -1665,8 +1667,8 @@ xfs_dialloc_good_ag(
 
 static int
 xfs_dialloc_try_ag(
-	struct xfs_trans	**tpp,
 	struct xfs_perag	*pag,
+	struct xfs_trans	**tpp,
 	xfs_ino_t		parent,
 	xfs_ino_t		*new_ino,
 	bool			ok_alloc)
@@ -1689,7 +1691,7 @@ xfs_dialloc_try_ag(
 			goto out_release;
 		}
 
-		error = xfs_ialloc_ag_alloc(*tpp, agbp, pag);
+		error = xfs_ialloc_ag_alloc(pag, *tpp, agbp);
 		if (error < 0)
 			goto out_release;
 
@@ -1705,7 +1707,7 @@ xfs_dialloc_try_ag(
 	}
 
 	/* Allocate an inode in the found AG */
-	error = xfs_dialloc_ag(*tpp, agbp, pag, parent, &ino);
+	error = xfs_dialloc_ag(pag, *tpp, agbp, parent, &ino);
 	if (!error)
 		*new_ino = ino;
 	return error;
@@ -1790,9 +1792,9 @@ xfs_dialloc(
 	agno = start_agno;
 	flags = XFS_ALLOC_FLAG_TRYLOCK;
 	for (;;) {
-		pag = xfs_perag_get(mp, agno);
-		if (xfs_dialloc_good_ag(*tpp, pag, mode, flags, ok_alloc)) {
-			error = xfs_dialloc_try_ag(tpp, pag, parent,
+		pag = xfs_perag_grab(mp, agno);
+		if (xfs_dialloc_good_ag(pag, *tpp, mode, flags, ok_alloc)) {
+			error = xfs_dialloc_try_ag(pag, tpp, parent,
 					&ino, ok_alloc);
 			if (error != -EAGAIN)
 				break;
@@ -1813,12 +1815,12 @@ xfs_dialloc(
 			if (low_space)
 				ok_alloc = true;
 		}
-		xfs_perag_put(pag);
+		xfs_perag_rele(pag);
 	}
 
 	if (!error)
 		*new_ino = ino;
-	xfs_perag_put(pag);
+	xfs_perag_rele(pag);
 	return error;
 }
 
@@ -1902,14 +1904,14 @@ xfs_difree_inode_chunk(
 
 STATIC int
 xfs_difree_inobt(
-	struct xfs_mount		*mp,
+	struct xfs_perag		*pag,
 	struct xfs_trans		*tp,
 	struct xfs_buf			*agbp,
-	struct xfs_perag		*pag,
 	xfs_agino_t			agino,
 	struct xfs_icluster		*xic,
 	struct xfs_inobt_rec_incore	*orec)
 {
+	struct xfs_mount		*mp = pag->pag_mount;
 	struct xfs_agi			*agi = agbp->b_addr;
 	struct xfs_btree_cur		*cur;
 	struct xfs_inobt_rec_incore	rec;
@@ -2036,13 +2038,13 @@ xfs_difree_inobt(
  */
 STATIC int
 xfs_difree_finobt(
-	struct xfs_mount		*mp,
+	struct xfs_perag		*pag,
 	struct xfs_trans		*tp,
 	struct xfs_buf			*agbp,
-	struct xfs_perag		*pag,
 	xfs_agino_t			agino,
 	struct xfs_inobt_rec_incore	*ibtrec) /* inobt record */
 {
+	struct xfs_mount		*mp = pag->pag_mount;
 	struct xfs_btree_cur		*cur;
 	struct xfs_inobt_rec_incore	rec;
 	int				offset = agino - ibtrec->ir_startino;
@@ -2196,7 +2198,7 @@ xfs_difree(
 	/*
 	 * Fix up the inode allocation btree.
 	 */
-	error = xfs_difree_inobt(mp, tp, agbp, pag, agino, xic, &rec);
+	error = xfs_difree_inobt(pag, tp, agbp, agino, xic, &rec);
 	if (error)
 		goto error0;
 
@@ -2204,7 +2206,7 @@ xfs_difree(
 	 * Fix up the free inode btree.
 	 */
 	if (xfs_has_finobt(mp)) {
-		error = xfs_difree_finobt(mp, tp, agbp, pag, agino, &rec);
+		error = xfs_difree_finobt(pag, tp, agbp, agino, &rec);
 		if (error)
 			goto error0;
 	}
@@ -2928,15 +2930,14 @@ xfs_ialloc_calc_rootino(
  */
 int
 xfs_ialloc_check_shrink(
+	struct xfs_perag	*pag,
 	struct xfs_trans	*tp,
-	xfs_agnumber_t		agno,
 	struct xfs_buf		*agibp,
 	xfs_agblock_t		new_length)
 {
 	struct xfs_inobt_rec_incore rec;
 	struct xfs_btree_cur	*cur;
 	struct xfs_mount	*mp = tp->t_mountp;
-	struct xfs_perag	*pag;
 	xfs_agino_t		agino = XFS_AGB_TO_AGINO(mp, new_length);
 	int			has;
 	int			error;
@@ -2944,7 +2945,6 @@ xfs_ialloc_check_shrink(
 	if (!xfs_has_sparseinodes(mp))
 		return 0;
 
-	pag = xfs_perag_get(mp, agno);
 	cur = xfs_inobt_init_cursor(mp, tp, agibp, pag, XFS_BTNUM_INO);
 
 	/* Look up the inobt record that would correspond to the new EOFS. */
@@ -2968,6 +2968,5 @@ xfs_ialloc_check_shrink(
 	}
 out:
 	xfs_btree_del_cursor(cur, error);
-	xfs_perag_put(pag);
 	return error;
 }

fs/xfs/libxfs/xfs_ialloc.h

@@ -107,7 +107,7 @@ int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
 void xfs_ialloc_setup_geometry(struct xfs_mount *mp);
 xfs_ino_t xfs_ialloc_calc_rootino(struct xfs_mount *mp, int sunit);
 
-int xfs_ialloc_check_shrink(struct xfs_trans *tp, xfs_agnumber_t agno,
+int xfs_ialloc_check_shrink(struct xfs_perag *pag, struct xfs_trans *tp,
 		struct xfs_buf *agibp, xfs_agblock_t new_length);
 
 #endif	/* __XFS_IALLOC_H__ */