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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-03-09 14:48:32 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-03-27 12:32:24 -0400
commitdf52699e4fcefe30ebe4f1db48bd161254a0b102 (patch)
tree7b590d25515d0fa5bbbe5c48e76a0857a73e10b0 /fs/nfs/pnfs_dev.c
parent4e59080397faadee59d39ffa2116dc8607adc9c9 (diff)
NFSv4.1: Don't cache deviceids that have no notifications
The spec says that once all layouts that reference a given deviceid have been returned, then we are only allowed to continue to cache the deviceid if the metadata server supports notifications. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs_dev.c')
-rw-r--r--fs/nfs/pnfs_dev.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/nfs/pnfs_dev.c b/fs/nfs/pnfs_dev.c
index 7e07f4ba4822..2961fcd7a2df 100644
--- a/fs/nfs/pnfs_dev.c
+++ b/fs/nfs/pnfs_dev.c
@@ -149,6 +149,8 @@ nfs4_get_device_info(struct nfs_server *server,
*/
d = server->pnfs_curr_ld->alloc_deviceid_node(server, pdev,
gfp_flags);
+ if (d && pdev->nocache)
+ set_bit(NFS_DEVICEID_NOCACHE, &d->flags);
out_free_pages:
for (i = 0; i < max_pages; i++)
@@ -235,6 +237,7 @@ nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *ld,
return;
}
hlist_del_init_rcu(&d->node);
+ clear_bit(NFS_DEVICEID_NOCACHE, &d->flags);
spin_unlock(&nfs4_deviceid_lock);
/* balance the initial ref set in pnfs_insert_deviceid */
@@ -269,6 +272,11 @@ EXPORT_SYMBOL_GPL(nfs4_init_deviceid_node);
bool
nfs4_put_deviceid_node(struct nfs4_deviceid_node *d)
{
+ if (test_bit(NFS_DEVICEID_NOCACHE, &d->flags)) {
+ if (atomic_add_unless(&d->ref, -1, 2))
+ return false;
+ nfs4_delete_deviceid(d->ld, d->nfs_client, &d->deviceid);
+ }
if (!atomic_dec_and_test(&d->ref))
return false;
d->ld->free_deviceid_node(d);
@@ -312,6 +320,7 @@ _deviceid_purge_client(const struct nfs_client *clp, long hash)
if (d->nfs_client == clp && atomic_read(&d->ref)) {
hlist_del_init_rcu(&d->node);
hlist_add_head(&d->tmpnode, &tmp);
+ clear_bit(NFS_DEVICEID_NOCACHE, &d->flags);
}
rcu_read_unlock();
spin_unlock(&nfs4_deviceid_lock);