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authorAndy Adamson <andros@netapp.com>2009-04-03 08:28:05 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-04-03 17:41:15 -0700
commita1bcecd29cdf1670df6908a620add4211c0abb7a (patch)
treea4323b21675db5a47a45f5d292fef468b9786007
parent0733d21338747483985a5964e852af160d88e429 (diff)
nfsd41: match clientid establishment method
We need to distinguish between client names provided by NFSv4.0 clients SETCLIENTID and those provided by NFSv4.1 via EXCHANGE_ID when looking up the clientid by string. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Andy Adamson <andros@netapp.com> [nfsd41: use boolean values for use_exchange_id argument] Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41: simplify match_clientid_establishment logic] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
-rw-r--r--fs/nfsd/nfs4recover.c3
-rw-r--r--fs/nfsd/nfs4state.c42
-rw-r--r--include/linux/nfsd/state.h2
3 files changed, 34 insertions, 13 deletions
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index b11cf8d34280..3444c0052a87 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -344,7 +344,8 @@ purge_old(struct dentry *parent, struct dentry *child)
{
int status;
- if (nfs4_has_reclaimed_state(child->d_name.name))
+ /* note: we currently use this path only for minorversion 0 */
+ if (nfs4_has_reclaimed_state(child->d_name.name, false))
return 0;
status = nfsd4_clear_clid_dir(parent, child);
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 4f963e902972..dfc6d946cdfe 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -715,25 +715,45 @@ find_unconfirmed_client(clientid_t *clid)
return NULL;
}
+/*
+ * Return 1 iff clp's clientid establishment method matches the use_exchange_id
+ * parameter. Matching is based on the fact the at least one of the
+ * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
+ *
+ * FIXME: we need to unify the clientid namespaces for nfsv4.x
+ * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
+ * and SET_CLIENTID{,_CONFIRM}
+ */
+static inline int
+match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
+{
+ bool has_exchange_flags = (clp->cl_exchange_flags != 0);
+ return use_exchange_id == has_exchange_flags;
+}
+
static struct nfs4_client *
-find_confirmed_client_by_str(const char *dname, unsigned int hashval)
+find_confirmed_client_by_str(const char *dname, unsigned int hashval,
+ bool use_exchange_id)
{
struct nfs4_client *clp;
list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
- if (same_name(clp->cl_recdir, dname))
+ if (same_name(clp->cl_recdir, dname) &&
+ match_clientid_establishment(clp, use_exchange_id))
return clp;
}
return NULL;
}
static struct nfs4_client *
-find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
+find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
+ bool use_exchange_id)
{
struct nfs4_client *clp;
list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
- if (same_name(clp->cl_recdir, dname))
+ if (same_name(clp->cl_recdir, dname) &&
+ match_clientid_establishment(clp, use_exchange_id))
return clp;
}
return NULL;
@@ -890,7 +910,7 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
nfs4_lock_state();
status = nfs_ok;
- conf = find_confirmed_client_by_str(dname, strhashval);
+ conf = find_confirmed_client_by_str(dname, strhashval, true);
if (conf) {
if (!same_verf(&verf, &conf->cl_verifier)) {
/* 18.35.4 case 8 */
@@ -938,7 +958,7 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
}
}
- unconf = find_unconfirmed_client_by_str(dname, strhashval);
+ unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
if (unconf) {
/*
* Possible retry or client restart. Per 18.35.4 case 4,
@@ -1035,7 +1055,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
strhashval = clientstr_hashval(dname);
nfs4_lock_state();
- conf = find_confirmed_client_by_str(dname, strhashval);
+ conf = find_confirmed_client_by_str(dname, strhashval, false);
if (conf) {
/* RFC 3530 14.2.33 CASE 0: */
status = nfserr_clid_inuse;
@@ -1050,7 +1070,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
* has a description of SETCLIENTID request processing consisting
* of 5 bullet points, labeled as CASE0 - CASE4 below.
*/
- unconf = find_unconfirmed_client_by_str(dname, strhashval);
+ unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
status = nfserr_resource;
if (!conf) {
/*
@@ -1205,7 +1225,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
unsigned int hash =
clientstr_hashval(unconf->cl_recdir);
conf = find_confirmed_client_by_str(unconf->cl_recdir,
- hash);
+ hash, false);
if (conf) {
nfsd4_remove_clid_dir(conf);
expire_client(conf);
@@ -3326,12 +3346,12 @@ alloc_reclaim(void)
}
int
-nfs4_has_reclaimed_state(const char *name)
+nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
{
unsigned int strhashval = clientstr_hashval(name);
struct nfs4_client *clp;
- clp = find_confirmed_client_by_str(name, strhashval);
+ clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
return clp ? 1 : 0;
}
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 8d0b10167937..90829db76861 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -330,7 +330,7 @@ extern void nfsd4_init_recdir(char *recdir_name);
extern int nfsd4_recdir_load(void);
extern void nfsd4_shutdown_recdir(void);
extern int nfs4_client_to_reclaim(const char *name);
-extern int nfs4_has_reclaimed_state(const char *name);
+extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
extern void nfsd4_recdir_purge_old(void);
extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);