NFSv4.1: Convert pNFS deviceid to use kfree_rcu()
Use of synchronize_rcu() when unmounting and potentially freeing a lot
of deviceids is problematic. There really is no reason why we can't just
use kfree_rcu() here.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c
index 5aed4f9..e535599 100644
--- a/fs/nfs/blocklayout/dev.c
+++ b/fs/nfs/blocklayout/dev.c
@@ -33,7 +33,7 @@
container_of(d, struct pnfs_block_dev, node);
bl_free_device(dev);
- kfree(dev);
+ kfree_rcu(dev, node.rcu);
}
static int
diff --git a/fs/nfs/filelayout/filelayoutdev.c b/fs/nfs/filelayout/filelayoutdev.c
index 4f372e2..4946ef4 100644
--- a/fs/nfs/filelayout/filelayoutdev.c
+++ b/fs/nfs/filelayout/filelayoutdev.c
@@ -55,7 +55,7 @@
nfs4_pnfs_ds_put(ds);
}
kfree(dsaddr->stripe_indices);
- kfree(dsaddr);
+ kfree_rcu(dsaddr, id_node.rcu);
}
/* Decode opaque device data and return the result */
diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
index e2c01f2..77a2d02 100644
--- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -30,7 +30,7 @@
{
nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
nfs4_pnfs_ds_put(mirror_ds->ds);
- kfree(mirror_ds);
+ kfree_rcu(mirror_ds, id_node.rcu);
}
/* Decode opaque device data and construct new_ds using it */
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
index 24e1d74..8b5e0e6 100644
--- a/fs/nfs/objlayout/objio_osd.c
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -57,7 +57,7 @@
dprintk("%s: free od=%p\n", __func__, de->od.od);
osduld_put_device(de->od.od);
- kfree(de);
+ kfree_rcu(d, rcu);
}
struct objio_segment {
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 635f086..a1fc16c 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -302,6 +302,7 @@
unsigned long flags;
unsigned long timestamp_unavailable;
struct nfs4_deviceid deviceid;
+ struct rcu_head rcu;
atomic_t ref;
};
diff --git a/fs/nfs/pnfs_dev.c b/fs/nfs/pnfs_dev.c
index aa2ec00..bf23ac9 100644
--- a/fs/nfs/pnfs_dev.c
+++ b/fs/nfs/pnfs_dev.c
@@ -175,8 +175,8 @@
rcu_read_lock();
d = _lookup_deviceid(server->pnfs_curr_ld, server->nfs_client, id,
hash);
- if (d != NULL)
- atomic_inc(&d->ref);
+ if (d != NULL && !atomic_inc_not_zero(&d->ref))
+ d = NULL;
rcu_read_unlock();
return d;
}
@@ -236,7 +236,6 @@
}
hlist_del_init_rcu(&d->node);
spin_unlock(&nfs4_deviceid_lock);
- synchronize_rcu();
/* balance the initial ref set in pnfs_insert_deviceid */
if (atomic_dec_and_test(&d->ref))
@@ -321,7 +320,6 @@
if (hlist_empty(&tmp))
return;
- synchronize_rcu();
while (!hlist_empty(&tmp)) {
d = hlist_entry(tmp.first, struct nfs4_deviceid_node, tmpnode);
hlist_del(&d->tmpnode);