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NFSv4: Fix delegation return in cases where we have to retry

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[ Upstream commit be20037725d17935ec669044bd2b15bc40c3b5ab ]

If we're unable to immediately recover all locks because the server is
unable to immediately service our reclaim calls, then we want to retry
after we've finished servicing all the other asynchronous delegation
returns on our queue.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2021-05-08 10:01:32 -04:00 committed by Greg Kroah-Hartman
parent b05c555c8d
commit 4970647404
3 changed files with 58 additions and 15 deletions
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71
fs/nfs/delegation.c
View File

@ -75,6 +75,13 @@ void nfs_mark_delegation_referenced(struct nfs_delegation *delegation)
set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);
}
static void nfs_mark_return_delegation(struct nfs_server *server,
struct nfs_delegation *delegation)
{
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
}
static bool
nfs4_is_valid_delegation(const struct nfs_delegation *delegation,
fmode_t flags)
@ -293,6 +300,7 @@ nfs_start_delegation_return_locked(struct nfs_inode *nfsi)
goto out;
spin_lock(&delegation->lock);
if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) {
clear_bit(NFS_DELEGATION_RETURN_DELAYED, &delegation->flags);
/* Refcount matched in nfs_end_delegation_return() */
ret = nfs_get_delegation(delegation);
}
@ -314,16 +322,17 @@ nfs_start_delegation_return(struct nfs_inode *nfsi)
return delegation;
}
static void
nfs_abort_delegation_return(struct nfs_delegation *delegation,
struct nfs_client *clp)
static void nfs_abort_delegation_return(struct nfs_delegation *delegation,
struct nfs_client *clp, int err)
{
spin_lock(&delegation->lock);
clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags);
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
if (err == -EAGAIN) {
set_bit(NFS_DELEGATION_RETURN_DELAYED, &delegation->flags);
set_bit(NFS4CLNT_DELEGRETURN_DELAYED, &clp->cl_state);
}
spin_unlock(&delegation->lock);
set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
}
static struct nfs_delegation *
@ -528,7 +537,7 @@ static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation
} while (err == 0);
if (err) {
nfs_abort_delegation_return(delegation, clp);
nfs_abort_delegation_return(delegation, clp, err);
goto out;
}
@ -557,6 +566,7 @@ static bool nfs_delegation_need_return(struct nfs_delegation *delegation)
if (ret)
clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags);
if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags) ||
test_bit(NFS_DELEGATION_RETURN_DELAYED, &delegation->flags) ||
test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
ret = false;
@ -636,6 +646,38 @@ static int nfs_server_return_marked_delegations(struct nfs_server *server,
return err;
}
static bool nfs_server_clear_delayed_delegations(struct nfs_server *server)
{
struct nfs_delegation *d;
bool ret = false;
list_for_each_entry_rcu (d, &server->delegations, super_list) {
if (!test_bit(NFS_DELEGATION_RETURN_DELAYED, &d->flags))
continue;
nfs_mark_return_delegation(server, d);
clear_bit(NFS_DELEGATION_RETURN_DELAYED, &d->flags);
ret = true;
}
return ret;
}
static bool nfs_client_clear_delayed_delegations(struct nfs_client *clp)
{
struct nfs_server *server;
bool ret = false;
if (!test_and_clear_bit(NFS4CLNT_DELEGRETURN_DELAYED, &clp->cl_state))
goto out;
rcu_read_lock();
list_for_each_entry_rcu (server, &clp->cl_superblocks, client_link) {
if (nfs_server_clear_delayed_delegations(server))
ret = true;
}
rcu_read_unlock();
out:
return ret;
}
/**
* nfs_client_return_marked_delegations - return previously marked delegations
* @clp: nfs_client to process
@ -648,8 +690,14 @@ static int nfs_server_return_marked_delegations(struct nfs_server *server,
*/
int nfs_client_return_marked_delegations(struct nfs_client *clp)
{
return nfs_client_for_each_server(clp,
nfs_server_return_marked_delegations, NULL);
int err = nfs_client_for_each_server(
clp, nfs_server_return_marked_delegations, NULL);
if (err)
return err;
/* If a return was delayed, sleep to prevent hard looping */
if (nfs_client_clear_delayed_delegations(clp))
ssleep(1);
return 0;
}
/**
@ -764,13 +812,6 @@ static void nfs_mark_return_if_closed_delegation(struct nfs_server *server,
set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
}
static void nfs_mark_return_delegation(struct nfs_server *server,
struct nfs_delegation *delegation)
{
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
}
static bool nfs_server_mark_return_all_delegations(struct nfs_server *server)
{
struct nfs_delegation *delegation;

1
fs/nfs/delegation.h
View File

@ -36,6 +36,7 @@ enum {
NFS_DELEGATION_REVOKED,
NFS_DELEGATION_TEST_EXPIRED,
NFS_DELEGATION_INODE_FREEING,
NFS_DELEGATION_RETURN_DELAYED,
};
int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,

1
fs/nfs/nfs4_fs.h
View File

@ -45,6 +45,7 @@ enum nfs4_client_state {
NFS4CLNT_RECALL_RUNNING,
NFS4CLNT_RECALL_ANY_LAYOUT_READ,
NFS4CLNT_RECALL_ANY_LAYOUT_RW,
NFS4CLNT_DELEGRETURN_DELAYED,
};
#define NFS4_RENEW_TIMEOUT 0x01