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Diffstat (limited to 'fs/nfs/delegation.c')
-rw-r--r--fs/nfs/delegation.c80
1 files changed, 50 insertions, 30 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 9f17b91205c..cee2ba42b68 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -57,7 +57,7 @@ out_err:
return status;
}
-static void nfs_delegation_claim_opens(struct inode *inode)
+static void nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_open_context *ctx;
@@ -72,6 +72,8 @@ again:
continue;
if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
continue;
+ if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0)
+ continue;
get_nfs_open_context(ctx);
spin_unlock(&inode->i_lock);
err = nfs4_open_delegation_recall(ctx, state);
@@ -170,33 +172,55 @@ static void nfs_msync_inode(struct inode *inode)
/*
* Basic procedure for returning a delegation to the server
*/
-int __nfs_inode_return_delegation(struct inode *inode)
+static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation)
{
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_inode *nfsi = NFS_I(inode);
- struct nfs_delegation *delegation;
- int res = 0;
nfs_msync_inode(inode);
down_read(&clp->cl_sem);
/* Guard against new delegated open calls */
down_write(&nfsi->rwsem);
- spin_lock(&clp->cl_lock);
- delegation = nfsi->delegation;
- if (delegation != NULL) {
- list_del_init(&delegation->super_list);
- nfsi->delegation = NULL;
- nfsi->delegation_state = 0;
- }
- spin_unlock(&clp->cl_lock);
- nfs_delegation_claim_opens(inode);
+ nfs_delegation_claim_opens(inode, &delegation->stateid);
up_write(&nfsi->rwsem);
up_read(&clp->cl_sem);
nfs_msync_inode(inode);
- if (delegation != NULL)
- res = nfs_do_return_delegation(inode, delegation);
- return res;
+ return nfs_do_return_delegation(inode, delegation);
+}
+
+static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid)
+{
+ struct nfs_delegation *delegation = nfsi->delegation;
+
+ if (delegation == NULL)
+ goto nomatch;
+ if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data,
+ sizeof(delegation->stateid.data)) != 0)
+ goto nomatch;
+ list_del_init(&delegation->super_list);
+ nfsi->delegation = NULL;
+ nfsi->delegation_state = 0;
+ return delegation;
+nomatch:
+ return NULL;
+}
+
+int nfs_inode_return_delegation(struct inode *inode)
+{
+ struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs_delegation *delegation;
+ int err = 0;
+
+ if (nfsi->delegation_state != 0) {
+ spin_lock(&clp->cl_lock);
+ delegation = nfs_detach_delegation_locked(nfsi, NULL);
+ spin_unlock(&clp->cl_lock);
+ if (delegation != NULL)
+ err = __nfs_inode_return_delegation(inode, delegation);
+ }
+ return err;
}
/*
@@ -218,8 +242,9 @@ restart:
inode = igrab(delegation->inode);
if (inode == NULL)
continue;
+ nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
- nfs_inode_return_delegation(inode);
+ __nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
@@ -243,8 +268,9 @@ restart:
inode = igrab(delegation->inode);
if (inode == NULL)
continue;
+ nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
- nfs_inode_return_delegation(inode);
+ __nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
@@ -285,8 +311,9 @@ restart:
inode = igrab(delegation->inode);
if (inode == NULL)
continue;
+ nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
- nfs_inode_return_delegation(inode);
+ __nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
@@ -316,21 +343,14 @@ static int recall_thread(void *data)
down_read(&clp->cl_sem);
down_write(&nfsi->rwsem);
spin_lock(&clp->cl_lock);
- delegation = nfsi->delegation;
- if (delegation != NULL && memcmp(delegation->stateid.data,
- args->stateid->data,
- sizeof(delegation->stateid.data)) == 0) {
- list_del_init(&delegation->super_list);
- nfsi->delegation = NULL;
- nfsi->delegation_state = 0;
+ delegation = nfs_detach_delegation_locked(nfsi, args->stateid);
+ if (delegation != NULL)
args->result = 0;
- } else {
- delegation = NULL;
+ else
args->result = -ENOENT;
- }
spin_unlock(&clp->cl_lock);
complete(&args->started);
- nfs_delegation_claim_opens(inode);
+ nfs_delegation_claim_opens(inode, args->stateid);
up_write(&nfsi->rwsem);
up_read(&clp->cl_sem);
nfs_msync_inode(inode);