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NFSv4.1: Test delegation stateids when server declares "some state revoked"

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According to RFC5661, if any of the SEQUENCE status bits
SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED,
SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED, SEQ4_STATUS_ADMIN_STATE_REVOKED,
or SEQ4_STATUS_RECALLABLE_STATE_REVOKED are set, then we need to use
TEST_STATEID to figure out which stateids have been revoked, so we
can acknowledge the loss of state using FREE_STATEID.

While we already do this for open and lock state, we have not been doing
so for all the delegations.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2016-09-22 13:38:59 -04:00 committed by Anna Schumaker
parent 41020b671a
commit 45870d6909
5 changed files with 122 additions and 9 deletions
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97
fs/nfs/delegation.c
View File

@ -812,8 +812,15 @@ static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)
{
struct nfs_delegation *delegation;
list_for_each_entry_rcu(delegation, &server->delegations, super_list)
list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
/*
* If the delegation may have been admin revoked, then we
* cannot reclaim it.
*/
if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags))
continue;
set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
}
}
/**
@ -877,6 +884,94 @@ void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
rcu_read_unlock();
}
static void nfs_mark_test_expired_delegation(struct nfs_server *server,
struct nfs_delegation *delegation)
{
clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state);
}
static void nfs_delegation_mark_test_expired_server(struct nfs_server *server)
{
struct nfs_delegation *delegation;
list_for_each_entry_rcu(delegation, &server->delegations, super_list)
nfs_mark_test_expired_delegation(server, delegation);
}
/**
* nfs_mark_test_expired_all_delegations - mark all delegations for testing
* @clp: nfs_client to process
*
* Iterates through all the delegations associated with this server and
* marks them as needing to be checked for validity.
*/
void nfs_mark_test_expired_all_delegations(struct nfs_client *clp)
{
struct nfs_server *server;
rcu_read_lock();
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
nfs_delegation_mark_test_expired_server(server);
rcu_read_unlock();
}
/**
* nfs_reap_expired_delegations - reap expired delegations
* @clp: nfs_client to process
*
* Iterates through all the delegations associated with this server and
* checks if they have may have been revoked. This function is usually
* expected to be called in cases where the server may have lost its
* lease.
*/
void nfs_reap_expired_delegations(struct nfs_client *clp)
{
const struct nfs4_minor_version_ops *ops = clp->cl_mvops;
struct nfs_delegation *delegation;
struct nfs_server *server;
struct inode *inode;
struct rpc_cred *cred;
nfs4_stateid stateid;
restart:
rcu_read_lock();
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
list_for_each_entry_rcu(delegation, &server->delegations,
super_list) {
if (test_bit(NFS_DELEGATION_RETURNING,
&delegation->flags))
continue;
if (test_bit(NFS_DELEGATION_TEST_EXPIRED,
&delegation->flags) == 0)
continue;
if (!nfs_sb_active(server->super))
continue;
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL) {
rcu_read_unlock();
nfs_sb_deactive(server->super);
goto restart;
}
cred = get_rpccred_rcu(delegation->cred);
nfs4_stateid_copy(&stateid, &delegation->stateid);
clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
rcu_read_unlock();
if (cred != NULL &&
ops->test_and_free_expired(server, &stateid, cred) < 0) {
nfs_revoke_delegation(inode, &stateid);
nfs_inode_find_state_and_recover(inode, &stateid);
}
put_rpccred(cred);
iput(inode);
nfs_sb_deactive(server->super);
goto restart;
}
}
rcu_read_unlock();
}
/**
* nfs_delegations_present - check for existence of delegations
* @clp: client state handle

4
fs/nfs/delegation.h
View File

@ -32,6 +32,7 @@ enum {
NFS_DELEGATION_REFERENCED,
NFS_DELEGATION_RETURNING,
NFS_DELEGATION_REVOKED,
NFS_DELEGATION_TEST_EXPIRED,
};
int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
@ -52,6 +53,9 @@ void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid)
void nfs_delegation_mark_reclaim(struct nfs_client *clp);
void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
void nfs_reap_expired_delegations(struct nfs_client *clp);
/* NFSv4 delegation-related procedures */
int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type);

3
fs/nfs/nfs4_fs.h
View File

@ -39,6 +39,7 @@ enum nfs4_client_state {
NFS4CLNT_BIND_CONN_TO_SESSION,
NFS4CLNT_MOVED,
NFS4CLNT_LEASE_MOVED,
NFS4CLNT_DELEGATION_EXPIRED,
};
#define NFS4_RENEW_TIMEOUT 0x01
@ -57,6 +58,8 @@ struct nfs4_minor_version_ops {
struct nfs_fsinfo *);
void (*free_lock_state)(struct nfs_server *,
struct nfs4_lock_state *);
int (*test_and_free_expired)(struct nfs_server *,
nfs4_stateid *, struct rpc_cred *);
struct nfs_seqid *
(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);

10
fs/nfs/nfs4proc.c
View File

@ -2408,6 +2408,13 @@ static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *st
return nfs4_open_expired(sp, state);
}
static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
return -NFS4ERR_BAD_STATEID;
}
#if defined(CONFIG_NFS_V4_1)
static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
@ -9061,6 +9068,7 @@ static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
.match_stateid = nfs4_match_stateid,
.find_root_sec = nfs4_find_root_sec,
.free_lock_state = nfs4_release_lockowner,
.test_and_free_expired = nfs40_test_and_free_expired_stateid,
.alloc_seqid = nfs_alloc_seqid,
.call_sync_ops = &nfs40_call_sync_ops,
.reboot_recovery_ops = &nfs40_reboot_recovery_ops,
@ -9088,6 +9096,7 @@ static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
.match_stateid = nfs41_match_stateid,
.find_root_sec = nfs41_find_root_sec,
.free_lock_state = nfs41_free_lock_state,
.test_and_free_expired = nfs41_test_and_free_expired_stateid,
.alloc_seqid = nfs_alloc_no_seqid,
.session_trunk = nfs4_test_session_trunk,
.call_sync_ops = &nfs41_call_sync_ops,
@ -9118,6 +9127,7 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
.find_root_sec = nfs41_find_root_sec,
.free_lock_state = nfs41_free_lock_state,
.call_sync_ops = &nfs41_call_sync_ops,
.test_and_free_expired = nfs41_test_and_free_expired_stateid,
.alloc_seqid = nfs_alloc_no_seqid,
.session_trunk = nfs4_test_session_trunk,
.reboot_recovery_ops = &nfs41_reboot_recovery_ops,

17
fs/nfs/nfs4state.c
View File

@ -1656,15 +1656,9 @@ static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
put_rpccred(cred);
}
static void nfs_delegation_clear_all(struct nfs_client *clp)
{
nfs_delegation_mark_reclaim(clp);
nfs_delegation_reap_unclaimed(clp);
}
static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
{
nfs_delegation_clear_all(clp);
nfs_mark_test_expired_all_delegations(clp);
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
}
@ -2195,7 +2189,7 @@ static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
{
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
nfs4_state_start_reclaim_nograce(clp);
nfs4_schedule_state_manager(clp);
dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
@ -2420,6 +2414,13 @@ static void nfs4_state_manager(struct nfs_client *clp)
nfs4_state_end_reclaim_reboot(clp);
}
/* Detect expired delegations... */
if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
section = "detect expired delegations";
nfs_reap_expired_delegations(clp);
continue;
}
/* Now recover expired state... */
if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
section = "reclaim nograce";