#include "delegation.h"
#include "internal.h"
-static void nfs_free_delegation(struct nfs_delegation *delegation)
+static void nfs_do_free_delegation(struct nfs_delegation *delegation)
{
- if (delegation->cred)
- put_rpccred(delegation->cred);
kfree(delegation);
}
{
struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu);
- nfs_free_delegation(delegation);
+ nfs_do_free_delegation(delegation);
+}
+
+static void nfs_free_delegation(struct nfs_delegation *delegation)
+{
+ struct rpc_cred *cred;
+
+ cred = rcu_dereference(delegation->cred);
+ rcu_assign_pointer(delegation->cred, NULL);
+ call_rcu(&delegation->rcu, nfs_free_delegation_callback);
+ if (cred)
+ put_rpccred(cred);
}
static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state)
struct file_lock *fl;
int status;
- for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
+ for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
continue;
- if ((struct nfs_open_context *)fl->fl_file->private_data != ctx)
+ if (nfs_file_open_context(fl->fl_file) != ctx)
continue;
status = nfs4_lock_delegation_recall(state, fl);
if (status >= 0)
void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
{
struct nfs_delegation *delegation = NFS_I(inode)->delegation;
+ struct rpc_cred *oldcred;
if (delegation == NULL)
return;
sizeof(delegation->stateid.data));
delegation->type = res->delegation_type;
delegation->maxsize = res->maxsize;
- put_rpccred(cred);
+ oldcred = delegation->cred;
delegation->cred = get_rpccred(cred);
delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM;
NFS_I(inode)->delegation_state = delegation->type;
smp_wmb();
+ put_rpccred(oldcred);
+}
+
+static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
+{
+ int res = 0;
+
+ res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync);
+ nfs_free_delegation(delegation);
+ return res;
+}
+
+static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid)
+{
+ struct nfs_delegation *delegation = rcu_dereference(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_rcu(&delegation->super_list);
+ nfsi->delegation_state = 0;
+ rcu_assign_pointer(nfsi->delegation, NULL);
+ return delegation;
+nomatch:
+ return NULL;
}
/*
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_delegation *delegation;
+ struct nfs_delegation *freeme = NULL;
int status = 0;
delegation = kmalloc(sizeof(*delegation), GFP_KERNEL);
delegation->inode = inode;
spin_lock(&clp->cl_lock);
- if (rcu_dereference(nfsi->delegation) == NULL) {
- list_add_rcu(&delegation->super_list, &clp->cl_delegations);
- nfsi->delegation_state = delegation->type;
- rcu_assign_pointer(nfsi->delegation, delegation);
- delegation = NULL;
- } else {
+ if (rcu_dereference(nfsi->delegation) != NULL) {
if (memcmp(&delegation->stateid, &nfsi->delegation->stateid,
- sizeof(delegation->stateid)) != 0 ||
- delegation->type != nfsi->delegation->type) {
- printk("%s: server %u.%u.%u.%u, handed out a duplicate delegation!\n",
- __FUNCTION__, NIPQUAD(clp->cl_addr.sin_addr));
- status = -EIO;
+ sizeof(delegation->stateid)) == 0 &&
+ delegation->type == nfsi->delegation->type) {
+ goto out;
+ }
+ /*
+ * Deal with broken servers that hand out two
+ * delegations for the same file.
+ */
+ dfprintk(FILE, "%s: server %s handed out "
+ "a duplicate delegation!\n",
+ __FUNCTION__, clp->cl_hostname);
+ if (delegation->type <= nfsi->delegation->type) {
+ freeme = delegation;
+ delegation = NULL;
+ goto out;
}
+ freeme = nfs_detach_delegation_locked(nfsi, NULL);
}
+ list_add_rcu(&delegation->super_list, &clp->cl_delegations);
+ nfsi->delegation_state = delegation->type;
+ rcu_assign_pointer(nfsi->delegation, delegation);
+ delegation = NULL;
/* Ensure we revalidate the attributes and page cache! */
spin_lock(&inode->i_lock);
nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
spin_unlock(&inode->i_lock);
+out:
spin_unlock(&clp->cl_lock);
- kfree(delegation);
+ if (delegation != NULL)
+ nfs_free_delegation(delegation);
+ if (freeme != NULL)
+ nfs_do_return_delegation(inode, freeme, 0);
return status;
}
-static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation)
-{
- int res = 0;
-
- res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid);
- call_rcu(&delegation->rcu, nfs_free_delegation_callback);
- return res;
-}
-
/* Sync all data to disk upon delegation return */
static void nfs_msync_inode(struct inode *inode)
{
up_read(&clp->cl_sem);
nfs_msync_inode(inode);
- return nfs_do_return_delegation(inode, delegation);
+ return nfs_do_return_delegation(inode, delegation, 1);
}
-static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid)
+/*
+ * This function returns the delegation without reclaiming opens
+ * or protecting against delegation reclaims.
+ * It is therefore really only safe to be called from
+ * nfs4_clear_inode()
+ */
+void nfs_inode_return_delegation_noreclaim(struct inode *inode)
{
- struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation);
+ struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs_delegation *delegation;
- if (delegation == NULL)
- goto nomatch;
- if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data,
- sizeof(delegation->stateid.data)) != 0)
- goto nomatch;
- list_del_rcu(&delegation->super_list);
- nfsi->delegation_state = 0;
- rcu_assign_pointer(nfsi->delegation, NULL);
- return delegation;
-nomatch:
- return NULL;
+ if (rcu_dereference(nfsi->delegation) != NULL) {
+ spin_lock(&clp->cl_lock);
+ delegation = nfs_detach_delegation_locked(nfsi, NULL);
+ spin_unlock(&clp->cl_lock);
+ if (delegation != NULL)
+ nfs_do_return_delegation(inode, delegation, 0);
+ }
}
int nfs_inode_return_delegation(struct inode *inode)
__module_get(THIS_MODULE);
atomic_inc(&clp->cl_count);
task = kthread_run(nfs_do_expire_all_delegations, clp,
- "%u.%u.%u.%u-delegreturn",
- NIPQUAD(clp->cl_addr.sin_addr));
+ "%s-delegreturn",
+ rpc_peeraddr2str(clp->cl_rpcclient,
+ RPC_DISPLAY_ADDR));
if (!IS_ERR(task))
return;
nfs_put_client(clp);
nfs_msync_inode(inode);
if (delegation != NULL)
- nfs_do_return_delegation(inode, delegation);
+ nfs_do_return_delegation(inode, delegation, 1);
iput(inode);
module_put_and_exit(0);
}
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation != NULL)
- call_rcu(&delegation->rcu, nfs_free_delegation_callback);
+ nfs_free_delegation(delegation);
goto restart;
}
rcu_read_unlock();
projects / linux-2.6-omap-h63xx.git / blobdiff