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authorChuck Lever <chuck.lever@oracle.com>2010-12-24 01:32:54 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-01-06 14:47:57 -0500
commitdda4b225623f316335052828c24a16e2da313f8f (patch)
treeb894d4c0c53e13f30e2bc6f7836dfdcd7a6c0173 /fs/nfs
parent24d292b894273495f9664bb495e575f8cb7e8cac (diff)
NFS: Introduce nfs_detach_delegations()
Clean up: Refactor code that takes clp->cl_lock and calls nfs_detach_delegations_locked() into its own function. While we're changing the call sites, get rid of the second parameter and the logic in nfs_detach_delegations_locked() that uses it, since callers always set that parameter of nfs_detach_delegations_locked() to NULL. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/delegation.c41
1 files changed, 20 insertions, 21 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 1fd62fc49be..521d71b8182 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -175,9 +175,9 @@ static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation
return inode;
}
-static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi,
- const nfs4_stateid *stateid,
- struct nfs_client *clp)
+static struct nfs_delegation *
+nfs_detach_delegation_locked(struct nfs_inode *nfsi,
+ struct nfs_client *clp)
{
struct nfs_delegation *delegation =
rcu_dereference_protected(nfsi->delegation,
@@ -185,22 +185,29 @@ static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfs
if (delegation == NULL)
goto nomatch;
+
spin_lock(&delegation->lock);
- if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data,
- sizeof(delegation->stateid.data)) != 0)
- goto nomatch_unlock;
list_del_rcu(&delegation->super_list);
delegation->inode = NULL;
nfsi->delegation_state = 0;
rcu_assign_pointer(nfsi->delegation, NULL);
spin_unlock(&delegation->lock);
return delegation;
-nomatch_unlock:
- spin_unlock(&delegation->lock);
nomatch:
return NULL;
}
+static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,
+ struct nfs_client *clp)
+{
+ struct nfs_delegation *delegation;
+
+ spin_lock(&clp->cl_lock);
+ delegation = nfs_detach_delegation_locked(nfsi, clp);
+ spin_unlock(&clp->cl_lock);
+ return delegation;
+}
+
/*
* Set up a delegation on an inode
*/
@@ -246,7 +253,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
delegation = NULL;
goto out;
}
- freeme = nfs_detach_delegation_locked(nfsi, NULL, clp);
+ freeme = nfs_detach_delegation_locked(nfsi, clp);
}
list_add_rcu(&delegation->super_list, &clp->cl_delegations);
nfsi->delegation_state = delegation->type;
@@ -307,9 +314,7 @@ restart:
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL)
continue;
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL, clp);
- spin_unlock(&clp->cl_lock);
+ delegation = nfs_detach_delegation(NFS_I(inode), clp);
rcu_read_unlock();
if (delegation != NULL) {
filemap_flush(inode->i_mapping);
@@ -338,9 +343,7 @@ void nfs_inode_return_delegation_noreclaim(struct inode *inode)
struct nfs_delegation *delegation;
if (rcu_access_pointer(nfsi->delegation) != NULL) {
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(nfsi, NULL, clp);
- spin_unlock(&clp->cl_lock);
+ delegation = nfs_detach_delegation(nfsi, clp);
if (delegation != NULL)
nfs_do_return_delegation(inode, delegation, 0);
}
@@ -354,9 +357,7 @@ int nfs_inode_return_delegation(struct inode *inode)
int err = 0;
if (rcu_access_pointer(nfsi->delegation) != NULL) {
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(nfsi, NULL, clp);
- spin_unlock(&clp->cl_lock);
+ delegation = nfs_detach_delegation(nfsi, clp);
if (delegation != NULL) {
nfs_wb_all(inode);
err = __nfs_inode_return_delegation(inode, delegation, 1);
@@ -530,9 +531,7 @@ restart:
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL)
continue;
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL, clp);
- spin_unlock(&clp->cl_lock);
+ delegation = nfs_detach_delegation(NFS_I(inode), clp);
rcu_read_unlock();
if (delegation != NULL)
nfs_free_delegation(delegation);