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authorJeff Layton <jlayton@primarydata.com>2014-07-30 14:27:11 +0200
committerJ. Bruce Fields <bfields@redhat.com>2014-08-01 22:28:24 +0200
commit217526e7ecc9f6f243e976772e81eab7ab986a4c (patch)
tree07a271d7b7592f682ad8ff8ff08ddd2c61bfc860 /fs/nfsd
parentnfsd: Add lockdep assertions to document the nfs4_client/session locking (diff)
downloadlinux-217526e7ecc9f6f243e976772e81eab7ab986a4c.tar.xz
linux-217526e7ecc9f6f243e976772e81eab7ab986a4c.zip
nfsd: protect the close_lru list and oo_last_closed_stid with client_lock
Currently, it's protected by the client_mutex. Move it so that the list and the fields in the openowner are protected by the client_lock. Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c38
1 files changed, 31 insertions, 7 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e7dfd4e9d942..818480035453 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1122,13 +1122,19 @@ static void unhash_openowner_locked(struct nfs4_openowner *oo)
static void release_last_closed_stateid(struct nfs4_openowner *oo)
{
- struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
+ struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
+ nfsd_net_id);
+ struct nfs4_ol_stateid *s;
+ spin_lock(&nn->client_lock);
+ s = oo->oo_last_closed_stid;
if (s) {
list_del_init(&oo->oo_close_lru);
oo->oo_last_closed_stid = NULL;
- nfs4_put_stid(&s->st_stid);
}
+ spin_unlock(&nn->client_lock);
+ if (s)
+ nfs4_put_stid(&s->st_stid);
}
static void release_openowner(struct nfs4_openowner *oo)
@@ -3265,6 +3271,7 @@ static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
static void
move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
{
+ struct nfs4_ol_stateid *last;
struct nfs4_openowner *oo = openowner(s->st_stateowner);
struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
nfsd_net_id);
@@ -3287,10 +3294,15 @@ move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
put_nfs4_file(s->st_stid.sc_file);
s->st_stid.sc_file = NULL;
}
- release_last_closed_stateid(oo);
+
+ spin_lock(&nn->client_lock);
+ last = oo->oo_last_closed_stid;
oo->oo_last_closed_stid = s;
list_move_tail(&oo->oo_close_lru, &nn->close_lru);
oo->oo_time = get_seconds();
+ spin_unlock(&nn->client_lock);
+ if (last)
+ nfs4_put_stid(&last->st_stid);
}
/* search file_hashtbl[] for file */
@@ -4148,6 +4160,7 @@ nfs4_laundromat(struct nfsd_net *nn)
struct nfs4_client *clp;
struct nfs4_openowner *oo;
struct nfs4_delegation *dp;
+ struct nfs4_ol_stateid *stp;
struct list_head *pos, *next, reaplist;
time_t cutoff = get_seconds() - nn->nfsd4_lease;
time_t t, new_timeo = nn->nfsd4_lease;
@@ -4201,15 +4214,26 @@ nfs4_laundromat(struct nfsd_net *nn)
list_del_init(&dp->dl_recall_lru);
revoke_delegation(dp);
}
- list_for_each_safe(pos, next, &nn->close_lru) {
- oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
- if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
+
+ spin_lock(&nn->client_lock);
+ while (!list_empty(&nn->close_lru)) {
+ oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
+ oo_close_lru);
+ if (time_after((unsigned long)oo->oo_time,
+ (unsigned long)cutoff)) {
t = oo->oo_time - cutoff;
new_timeo = min(new_timeo, t);
break;
}
- release_last_closed_stateid(oo);
+ list_del_init(&oo->oo_close_lru);
+ stp = oo->oo_last_closed_stid;
+ oo->oo_last_closed_stid = NULL;
+ spin_unlock(&nn->client_lock);
+ nfs4_put_stid(&stp->st_stid);
+ spin_lock(&nn->client_lock);
}
+ spin_unlock(&nn->client_lock);
+
new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
nfs4_unlock_state();
return new_timeo;