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nfsd: convert nfs4_client->cl_cb_flags to a generic flags field

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We'll need a way to flag the nfs4_client as already being recorded on
stable storage so that we don't continually upcall. Currently, that's
recorded in the cl_firststate field of the client struct. Using an
entire u32 to store a flag is rather wasteful though.

The cl_cb_flags field is only using 2 bits right now, so repurpose that
to a generic flags field. Rename NFSD4_CLIENT_KILL to
NFSD4_CLIENT_CB_KILL to make it evident that it's part of the callback
flags. Add a mask that we can use for existing checks that look to see
whether any flags are set, so that the new flags don't interfere.

Convert all references to cl_firstate to the NFSD4_CLIENT_STABLE flag,
and add a new NFSD4_CLIENT_RECLAIM_COMPLETE flag.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton
2012-03-21 09:52:02 -04:00
committed by J. Bruce Fields
parent 1df00640c9
commit a52d726bbd
5 changed files with 47 additions and 33 deletions
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45
fs/nfsd/nfs4state.c
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@@ -2069,7 +2069,8 @@ nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *csta
nfs4_lock_state();
status = nfserr_complete_already;
if (cstate->session->se_client->cl_firststate)
if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
&cstate->session->se_client->cl_flags))
goto out;
status = nfserr_stale_clientid;
@@ -2816,12 +2817,6 @@ static void
nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
{
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
/*
* On a 4.1+ client, we don't create a state record for a client
* until it performs RECLAIM_COMPLETE:
*/
if (!has_session)
open->op_openowner->oo_owner.so_client->cl_firststate = 1;
}
/* Should we give out recallable state?: */
@@ -4462,7 +4457,7 @@ nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
clp = find_confirmed_client_by_str(name, strhashval);
if (!clp)
return 0;
return clp->cl_firststate;
return test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
}
/*
@@ -4507,18 +4502,11 @@ nfs4_release_reclaim(void)
/*
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
static struct nfs4_client_reclaim *
nfs4_find_reclaim_client(clientid_t *clid)
nfsd4_find_reclaim_client(struct nfs4_client *clp)
{
unsigned int strhashval;
struct nfs4_client *clp;
struct nfs4_client_reclaim *crp = NULL;
/* find clientid in conf_id_hashtbl */
clp = find_confirmed_client(clid);
if (clp == NULL)
return NULL;
dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
clp->cl_name.len, clp->cl_name.data,
clp->cl_recdir);
@@ -4533,13 +4521,36 @@ nfs4_find_reclaim_client(clientid_t *clid)
return NULL;
}
static int
nfsd4_client_record_check(struct nfs4_client *clp)
{
/* did we already find that this client is stable? */
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
return 0;
/* look for it in the reclaim hashtable otherwise */
if (nfsd4_find_reclaim_client(clp)) {
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
return 0;
}
return -ENOENT;
}
/*
* Called from OPEN. Look for clientid in reclaim list.
*/
__be32
nfs4_check_open_reclaim(clientid_t *clid)
{
return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
struct nfs4_client *clp;
/* find clientid in conf_id_hashtbl */
clp = find_confirmed_client(clid);
if (clp == NULL)
return nfserr_reclaim_bad;
return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
}
#ifdef CONFIG_NFSD_FAULT_INJECTION