linux-kernel - [PATCH 5.5 78/80] NFSv4: Add accounting for the number of active delegations held

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Message-Id: <20200218190439.243798210@linuxfoundation.org>
Date:   Tue, 18 Feb 2020 20:55:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 78/80] NFSv4: Add accounting for the number of active delegations held

From: Trond Myklebust <trondmy@...il.com>

[ Upstream commit d2269ea14ebd2a73f291d6b3a7a7d320ec00270c ]

In order to better manage our delegation caching, add a counter
to track the number of active delegations.

Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/delegation.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 5f02d922f2173..8e322bacde699 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -25,13 +25,29 @@
 #include "internal.h"
 #include "nfs4trace.h"
 
-static void nfs_free_delegation(struct nfs_delegation *delegation)
+static atomic_long_t nfs_active_delegations;
+
+static void __nfs_free_delegation(struct nfs_delegation *delegation)
 {
 	put_cred(delegation->cred);
 	delegation->cred = NULL;
 	kfree_rcu(delegation, rcu);
 }
 
+static void nfs_mark_delegation_revoked(struct nfs_delegation *delegation)
+{
+	if (!test_and_set_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
+		delegation->stateid.type = NFS4_INVALID_STATEID_TYPE;
+		atomic_long_dec(&nfs_active_delegations);
+	}
+}
+
+static void nfs_free_delegation(struct nfs_delegation *delegation)
+{
+	nfs_mark_delegation_revoked(delegation);
+	__nfs_free_delegation(delegation);
+}
+
 /**
  * nfs_mark_delegation_referenced - set delegation's REFERENCED flag
  * @delegation: delegation to process
@@ -348,7 +364,8 @@ nfs_update_inplace_delegation(struct nfs_delegation *delegation,
 		delegation->stateid.seqid = update->stateid.seqid;
 		smp_wmb();
 		delegation->type = update->type;
-		clear_bit(NFS_DELEGATION_REVOKED, &delegation->flags);
+		if (test_and_clear_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
+			atomic_long_inc(&nfs_active_delegations);
 	}
 }
 
@@ -428,6 +445,8 @@ int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
 	rcu_assign_pointer(nfsi->delegation, delegation);
 	delegation = NULL;
 
+	atomic_long_inc(&nfs_active_delegations);
+
 	trace_nfs4_set_delegation(inode, type);
 
 	spin_lock(&inode->i_lock);
@@ -437,7 +456,7 @@ int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
 out:
 	spin_unlock(&clp->cl_lock);
 	if (delegation != NULL)
-		nfs_free_delegation(delegation);
+		__nfs_free_delegation(delegation);
 	if (freeme != NULL) {
 		nfs_do_return_delegation(inode, freeme, 0);
 		nfs_free_delegation(freeme);
@@ -765,13 +784,6 @@ static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *cl
 	rcu_read_unlock();
 }
 
-static void nfs_mark_delegation_revoked(struct nfs_server *server,
-		struct nfs_delegation *delegation)
-{
-	set_bit(NFS_DELEGATION_REVOKED, &delegation->flags);
-	delegation->stateid.type = NFS4_INVALID_STATEID_TYPE;
-}
-
 static void nfs_revoke_delegation(struct inode *inode,
 		const nfs4_stateid *stateid)
 {
@@ -799,7 +811,7 @@ static void nfs_revoke_delegation(struct inode *inode,
 		}
 		spin_unlock(&delegation->lock);
 	}
-	nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation);
+	nfs_mark_delegation_revoked(delegation);
 	ret = true;
 out:
 	rcu_read_unlock();
@@ -838,7 +850,7 @@ void nfs_delegation_mark_returned(struct inode *inode,
 			delegation->stateid.seqid = stateid->seqid;
 	}
 
-	nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation);
+	nfs_mark_delegation_revoked(delegation);
 
 out_clear_returning:
 	clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags);
-- 
2.20.1