Allow stateowners to be unhashed and destroyed when the last reference
is put. The unhashing must be idempotent. In a future patch, we'll add
some locking around it, but for now it's only protected by the
client_mutex.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 45 +++++++++++++++++++++++++++++++++++----------
fs/nfsd/state.h | 1 +
2 files changed, 36 insertions(+), 10 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e40b8e92b65d..086decc72fcc 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -817,9 +817,13 @@ static void __release_lock_stateid(struct nfs4_lockowner *lo,
static void unhash_lockowner(struct nfs4_lockowner *lo)
{
+ list_del_init(&lo->lo_owner.so_strhash);
+}
+
+static void release_lockowner_stateids(struct nfs4_lockowner *lo)
+{
struct nfs4_ol_stateid *stp;
- list_del(&lo->lo_owner.so_strhash);
while (!list_empty(&lo->lo_owner.so_stateids)) {
stp = list_first_entry(&lo->lo_owner.so_stateids,
struct nfs4_ol_stateid, st_perstateowner);
@@ -830,6 +834,7 @@ static void unhash_lockowner(struct nfs4_lockowner *lo)
static void release_lockowner(struct nfs4_lockowner *lo)
{
unhash_lockowner(lo);
+ release_lockowner_stateids(lo);
nfs4_put_stateowner(&lo->lo_owner);
}
@@ -879,15 +884,8 @@ static void release_open_stateid(struct nfs4_ol_stateid *stp)
static void unhash_openowner(struct nfs4_openowner *oo)
{
- struct nfs4_ol_stateid *stp;
-
- list_del(&oo->oo_owner.so_strhash);
- list_del(&oo->oo_perclient);
- while (!list_empty(&oo->oo_owner.so_stateids)) {
- stp = list_first_entry(&oo->oo_owner.so_stateids,
- struct nfs4_ol_stateid, st_perstateowner);
- release_open_stateid(stp);
- }
+ list_del_init(&oo->oo_owner.so_strhash);
+ list_del_init(&oo->oo_perclient);
}
static void release_last_closed_stateid(struct nfs4_openowner *oo)
@@ -900,9 +898,21 @@ static void release_last_closed_stateid(struct nfs4_openowner *oo)
}
}
+static void release_openowner_stateids(struct nfs4_openowner *oo)
+{
+ struct nfs4_ol_stateid *stp;
+
+ while (!list_empty(&oo->oo_owner.so_stateids)) {
+ stp = list_first_entry(&oo->oo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ release_open_stateid(stp);
+ }
+}
+
static void release_openowner(struct nfs4_openowner *oo)
{
unhash_openowner(oo);
+ release_openowner_stateids(oo);
list_del(&oo->oo_close_lru);
release_last_closed_stateid(oo);
nfs4_put_stateowner(&oo->oo_owner);
@@ -2878,6 +2888,7 @@ static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
{
if (!atomic_dec_and_test(&sop->so_count))
return;
+ sop->so_unhash(sop);
sop->so_free(sop);
}
@@ -2889,6 +2900,13 @@ static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, u
list_add(&oo->oo_perclient, &clp->cl_openowners);
}
+static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
+{
+ struct nfs4_openowner *oo = openowner(so);
+
+ unhash_openowner(oo);
+}
+
static void nfs4_free_openowner(struct nfs4_stateowner *so)
{
struct nfs4_openowner *oo = openowner(so);
@@ -2905,6 +2923,7 @@ alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, str
if (!oo)
return NULL;
oo->oo_owner.so_free = nfs4_free_openowner;
+ oo->oo_owner.so_unhash = nfs4_unhash_openowner;
oo->oo_owner.so_is_open_owner = 1;
oo->oo_owner.so_seqid = open->op_seqid;
oo->oo_flags = NFS4_OO_NEW;
@@ -4621,6 +4640,11 @@ static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, s
list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
}
+static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
+{
+ unhash_lockowner(lockowner(sop));
+}
+
static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
{
struct nfs4_lockowner *lo = lockowner(sop);
@@ -4648,6 +4672,7 @@ alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, str
lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
hash_lockowner(lo, strhashval, clp);
lo->lo_owner.so_free = nfs4_free_lockowner;
+ lo->lo_owner.so_unhash = nfs4_unhash_lockowner;
return lo;
}
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index ebd3d302a572..147d0c91b819 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -347,6 +347,7 @@ struct nfs4_stateowner {
bool so_is_open_owner;
void (*so_free)(struct nfs4_stateowner *);
+ void (*so_unhash)(struct nfs4_stateowner *);
};
struct nfs4_openowner {
--
1.9.3
--
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