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NFSv4: Clean up the support for returning multiple delegations

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Add a flag to mark delegations as requiring return, then run a garbage
collector. In the future, this will allow for more flexible delegation
management, where delegations may be marked for return if it turns out
that they are not being referenced.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2008-12-23 15:21:46 -05:00
parent 9e33bed552
commit 515d861177
3 changed files with 52 additions and 55 deletions
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97
fs/nfs/delegation.c
View File

@@ -255,6 +255,34 @@ static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegat
return nfs_do_return_delegation(inode, delegation, 1);
}
/*
* Return all delegations that have been marked for return
*/
static void nfs_client_return_marked_delegations(struct nfs_client *clp)
{
struct nfs_delegation *delegation;
struct inode *inode;
restart:
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
continue;
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL)
continue;
spin_lock(&clp->cl_lock);
delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation != NULL)
__nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
rcu_read_unlock();
}
/*
* This function returns the delegation without reclaiming opens
* or protecting against delegation reclaims.
@@ -296,63 +324,46 @@ int nfs_inode_return_delegation(struct inode *inode)
/*
* Return all delegations associated to a super block
*/
void nfs_return_all_delegations(struct super_block *sb)
void nfs_super_return_all_delegations(struct super_block *sb)
{
struct nfs_client *clp = NFS_SB(sb)->nfs_client;
struct nfs_delegation *delegation;
struct inode *inode;
if (clp == NULL)
return;
restart:
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
inode = NULL;
spin_lock(&delegation->lock);
if (delegation->inode != NULL && delegation->inode->i_sb == sb)
inode = igrab(delegation->inode);
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
spin_unlock(&delegation->lock);
if (inode == NULL)
continue;
spin_lock(&clp->cl_lock);
delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation != NULL)
__nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
rcu_read_unlock();
nfs_client_return_marked_delegations(clp);
}
static void nfs_client_return_all_delegations(struct nfs_client *clp)
{
struct nfs_delegation *delegation;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list)
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
rcu_read_unlock();
nfs_client_return_marked_delegations(clp);
}
static int nfs_do_expire_all_delegations(void *ptr)
{
struct nfs_client *clp = ptr;
struct nfs_delegation *delegation;
struct inode *inode;
allow_signal(SIGKILL);
restart:
if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0)
goto out;
if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0)
goto out;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL)
continue;
spin_lock(&clp->cl_lock);
delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation)
__nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
rcu_read_unlock();
nfs_client_return_all_delegations(clp);
out:
nfs_put_client(clp);
module_put_and_exit(0);
@@ -379,27 +390,9 @@ void nfs_expire_all_delegations(struct nfs_client *clp)
*/
void nfs_handle_cb_pathdown(struct nfs_client *clp)
{
struct nfs_delegation *delegation;
struct inode *inode;
if (clp == NULL)
return;
restart:
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL)
continue;
spin_lock(&clp->cl_lock);
delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation != NULL)
__nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
rcu_read_unlock();
nfs_client_return_all_delegations(clp);
}
struct recall_threadargs {