From 1759378307a29ad1f09be636e04b762add9d259c Mon Sep 17 00:00:00 2001
From: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Date: Wed, 7 May 2014 17:15:01 +0400
Subject: [PATCH 1/2] dump referenced dnodes at umount
---
module/zfs/dnode.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 59 insertions(+), 1 deletion(-)
diff --git a/module/zfs/dnode.c b/module/zfs/dnode.c
index 5cb5fcc..8e9a46d 100644
--- a/module/zfs/dnode.c
+++ b/module/zfs/dnode.c
@@ -931,10 +931,52 @@ dnode_move(void *buf, void *newbuf, size_t size, void *arg)
}
#endif /* _KERNEL */
+#ifdef __KERNEL__
+static void
+dbuf_dump_dnodes(dmu_buf_impl_t *db)
+{
+ dnode_children_t *children_dnodes;
+ dnode_handle_t *dnh;
+#ifdef __ZFS_DEBUG
+ reference_t *ref;
+#endif
+ dnode_t *dn;
+ int i, epb;
+
+ children_dnodes = dmu_buf_get_user(&db->db);
+ if (children_dnodes == NULL)
+ return;
+
+ epb = db->db.db_size >> DNODE_SHIFT;
+
+ for (i = 0; i < epb-1; i++) {
+ dnh = &children_dnodes->dnc_children[i];
+ if ((dn = dnh->dnh_dnode) == NULL)
+ continue;
+ if (refcount_count(&dn->dn_holds) == 0)
+ continue;
+ printk(" dnode %Lu, db %p, refcount %d\n",
+ dn->dn_object, dn->dn_bonus,
+ (int)refcount_count(&dn->dn_holds));
+#ifdef ZFS_DEBUG
+ for (ref = list_head(&dn->dn_holds.rc_list); ref;
+ ref = list_next(&dn->dn_holds.rc_list, ref)) {
+ printk(" %d, %s\n", (int)ref->ref_number,
+ (char *)ref->ref_holder);
+ }
+#endif
+ }
+}
+#endif
+
void
dnode_special_close(dnode_handle_t *dnh)
{
dnode_t *dn = dnh->dnh_dnode;
+#ifdef __KERNEL__
+ dmu_buf_impl_t *db, *db_next;
+#endif
+ int count = 0;
/*
* Wait for final references to the dnode to clear. This can
@@ -942,8 +984,24 @@ dnode_special_close(dnode_handle_t *dnh)
* has a hold on this dnode while we are trying to evict this
* dnode.
*/
- while (refcount_count(&dn->dn_holds) > 0)
+ while (refcount_count(&dn->dn_holds) > 0) {
delay(1);
+ if (++count != 100)
+ continue;
+#ifdef __KERNEL__
+ printk("dnode %Lu\n", dn->dn_object);
+ for (db = list_head(&dn->dn_dbufs); db; db = db_next) {
+ db_next = list_next(&dn->dn_dbufs, db);
+ printk("db %p, blkid %Lu -> objid %Lu-%Lu\n",
+ db, db->db_blkid,
+ (db->db_blkid << dn->dn_datablkshift)
+ / sizeof (dnode_phys_t),
+ ((db->db_blkid+1) << dn->dn_datablkshift)
+ / sizeof (dnode_phys_t));
+ dbuf_dump_dnodes(db);
+ }
+#endif
+ }
zrl_add(&dnh->dnh_zrlock);
dnode_destroy(dn); /* implicit zrl_remove() */
zrl_destroy(&dnh->dnh_zrlock);
--
1.9.3 (Apple Git-50)