nfs: tear down caches in nfs_init_writepagecache when allocation fails

...and ensure that we tear down the nfs_commit_data cache too when
unloading the module.

Cc: Bryan Schumaker <bjschuma@netapp.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 5829d0ce7cf..e3b55372726 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1814,19 +1814,19 @@ int __init nfs_init_writepagecache(void)
         nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
                                                      nfs_wdata_cachep);
         if (nfs_wdata_mempool == NULL)
-                return -ENOMEM;
+                goto out_destroy_write_cache;
 
         nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
                                              sizeof(struct nfs_commit_data),
                                              0, SLAB_HWCACHE_ALIGN,
                                              NULL);
         if (nfs_cdata_cachep == NULL)
-                return -ENOMEM;
+                goto out_destroy_write_mempool;
 
         nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
                                                       nfs_wdata_cachep);
         if (nfs_commit_mempool == NULL)
-                return -ENOMEM;
+                goto out_destroy_commit_cache;
 
         /*
          * NFS congestion size, scale with available memory.
@@ -1849,11 +1849,20 @@ int __init nfs_init_writepagecache(void)
                 nfs_congestion_kb = 256*1024;
 
         return 0;
+
+out_destroy_commit_cache:
+        kmem_cache_destroy(nfs_cdata_cachep);
+out_destroy_write_mempool:
+        mempool_destroy(nfs_wdata_mempool);
+out_destroy_write_cache:
+        kmem_cache_destroy(nfs_wdata_cachep);
+        return -ENOMEM;
 }
 
 void nfs_destroy_writepagecache(void)
 {
         mempool_destroy(nfs_commit_mempool);
+        kmem_cache_destroy(nfs_cdata_cachep);
         mempool_destroy(nfs_wdata_mempool);
         kmem_cache_destroy(nfs_wdata_cachep);
 }