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NFSv4: Add accounting for the number of active delegations held

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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@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2020-01-27 09:58:18 -05:00 committed by Anna Schumaker
parent b7b7dac684
commit d2269ea14e
1 changed files with 24 additions and 12 deletions
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36
fs/nfs/delegation.c
View File

@ -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
@ -343,7 +359,8 @@ 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);
}
}
@ -423,6 +440,8 @@ add_new:
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);
@ -432,7 +451,7 @@ add_new:
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);
@ -796,13 +815,6 @@ 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)
{
@ -830,7 +842,7 @@ 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();
@ -869,7 +881,7 @@ 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);