xfs: check absolute maximum nlevels for each btree type

Add code for all five btree types so that we can compute the absolute
maximum possible btree height for each btree type, and then check that
none of them exceed XFS_BTREE_CUR_ZONE_MAXLEVELS.  The code to do the
actual checking is a little excessive, but it sets us up for per-type
cursor zones in the next patch.

xfs_btree_absolute_maxlevels exists to enable xfs_db functionality.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index af8c5d06cc82..0b1c1960e6ce 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -38,6 +38,12 @@
 #include "xfs_pwork.h"
 #include "xfs_ag.h"
 #include "xfs_swapext_item.h"
+#include "xfs_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_rmap_btree.h"
+#include "xfs_refcount_btree.h"
 
 #include <linux/magic.h>
 #include <linux/fs_context.h>
@@ -2007,8 +2013,34 @@ static struct file_system_type xfs_fs_type = {
 MODULE_ALIAS_FS("xfs");
 
 STATIC int __init
+xfs_init_btree_caches(void)
+{
+	int				error;
+
+	error = xfs_allocbt_create_cursor_cache();
+	if (error)
+		return error;
+	error = xfs_inobt_create_cursor_cache();
+	if (error)
+		return error;
+	error = xfs_bmbt_create_cursor_cache();
+	if (error)
+		return error;
+	error = xfs_rmapbt_create_cursor_cache();
+	if (error)
+		return error;
+	error = xfs_refcountbt_create_cursor_cache();
+	if (error)
+		return error;
+
+	return 0;
+}
+
+STATIC int __init
 xfs_init_zones(void)
 {
+	int			error;
+
 	xfs_log_ticket_zone = kmem_cache_create("xfs_log_ticket",
 						sizeof(struct xlog_ticket),
 						0, 0, NULL);
@@ -2021,6 +2053,10 @@ xfs_init_zones(void)
 	if (!xfs_bmap_free_item_zone)
 		goto out_destroy_log_ticket_zone;
 
+	error = xfs_init_btree_caches();
+	if (error)
+		goto out_destroy_bmap_free_item_zone;
+
 	xfs_btree_cur_zone = kmem_cache_create("xfs_btree_cur",
 			xfs_btree_cur_sizeof(XFS_BTREE_CUR_ZONE_MAXLEVELS),
 			0, 0, NULL);