nfsd: make lockowner_ino_hashtbl allocated per net

This hash holds file lock owners and closely associated with nfs4_clients info,
which are network namespace aware. So let's make it allocated per network
namespace too.

Note: this hash can be allocated in per-net operations. But it looks
better to allocate it on nfsd state start and thus don't waste resources
if server is not running.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 20 insertions, 11 deletions

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 46cca9494c7a..2281f6df5573 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -29,6 +29,9 @@
 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
 
+#define LOCKOWNER_INO_HASH_BITS         8
+#define LOCKOWNER_INO_HASH_SIZE         (1 << LOCKOWNER_INO_HASH_BITS)
+
 struct cld_net;
 
 struct nfsd_net {
@@ -61,6 +64,7 @@ struct nfsd_net {
         struct list_head *unconf_id_hashtbl;
         struct rb_root unconf_name_tree;
         struct list_head *ownerstr_hashtbl;
+        struct list_head *lockowner_ino_hashtbl;
 };
 
 extern int nfsd_net_id;
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f68514d8210e..1e76d55a3e9a 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3862,8 +3862,6 @@ out:
 
 #define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
 
-#define LOCKOWNER_INO_HASH_BITS 8
-#define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
 #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
 
 static inline u64
@@ -3893,8 +3891,6 @@ static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct
                 & LOCKOWNER_INO_HASH_MASK;
 }
 
-static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
-
 /*
  * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
  * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
@@ -3960,12 +3956,12 @@ static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, c
 
 static struct nfs4_lockowner *
 find_lockowner_str(struct inode *inode, clientid_t *clid,
-                struct xdr_netobj *owner)
+                   struct xdr_netobj *owner, struct nfsd_net *nn)
 {
         unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
         struct nfs4_lockowner *lo;
 
-        list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
+        list_for_each_entry(lo, &nn->lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
                 if (same_lockowner_ino(lo, inode, clid, owner))
                         return lo;
         }
@@ -3980,7 +3976,7 @@ static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, s
         struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 
         list_add(&lo->lo_owner.so_strhash, &nn->ownerstr_hashtbl[strhashval]);
-        list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
+        list_add(&lo->lo_owner_ino_hash, &nn->lockowner_ino_hashtbl[inohash]);
         list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
 }
 
@@ -4054,8 +4050,10 @@ static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, s
         struct nfs4_client *cl = oo->oo_owner.so_client;
         struct nfs4_lockowner *lo;
         unsigned int strhashval;
+        struct nfsd_net *nn = net_generic(cl->net, nfsd_net_id);
 
-        lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
+        lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid,
+                                &lock->v.new.owner, nn);
         if (lo) {
                 if (!cstate->minorversion)
                         return nfserr_bad_seqid;
@@ -4308,7 +4306,7 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                 goto out;
         }
 
-        lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
+        lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner, nn);
         if (lo)
                 file_lock->fl_owner = (fl_owner_t)lo;
         file_lock->fl_pid = current->tgid;
@@ -4726,8 +4724,6 @@ nfs4_state_init(void)
         for (i = 0; i < FILE_HASH_SIZE; i++) {
                 INIT_LIST_HEAD(&file_hashtbl[i]);
         }
-        for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
-                INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
         INIT_LIST_HEAD(&close_lru);
         INIT_LIST_HEAD(&client_lru);
         INIT_LIST_HEAD(&del_recall_lru);
@@ -4771,6 +4767,10 @@ static int nfs4_state_start_net(struct net *net)
                         OWNER_HASH_SIZE, GFP_KERNEL);
         if (!nn->ownerstr_hashtbl)
                 goto err_ownerstr;
+        nn->lockowner_ino_hashtbl = kmalloc(sizeof(struct list_head) *
+                        LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
+        if (!nn->lockowner_ino_hashtbl)
+                goto err_lockowner_ino;
 
         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
@@ -4778,11 +4778,15 @@ static int nfs4_state_start_net(struct net *net)
         }
         for (i = 0; i < OWNER_HASH_SIZE; i++)
                 INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
+        for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
+                INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
         nn->conf_name_tree = RB_ROOT;
         nn->unconf_name_tree = RB_ROOT;
 
         return 0;
 
+err_lockowner_ino:
+        kfree(nn->ownerstr_hashtbl);
 err_ownerstr:
         kfree(nn->unconf_id_hashtbl);
 err_unconf_id:
@@ -4815,6 +4819,7 @@ __nfs4_state_shutdown_net(struct net *net)
                 destroy_client(clp);
         }
 
+        kfree(nn->lockowner_ino_hashtbl);
         kfree(nn->ownerstr_hashtbl);
         kfree(nn->unconf_id_hashtbl);
         kfree(nn->conf_id_hashtbl);