NFSv4: Defer inode revalidation when setting up a delegation

Currently we force a synchronous call to __nfs_revalidate_inode() in
nfs_inode_set_delegation(). This not only ensures that we cannot call
nfs_inode_set_delegation from an asynchronous context, but it also slows
down any call to open().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 56f4f6a99d4e..20ac403469a0 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -124,10 +124,6 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
         struct nfs_delegation *delegation;
         int status = 0;
 
-        /* Ensure we first revalidate the attributes and page cache! */
-        if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR)))
-                __nfs_revalidate_inode(NFS_SERVER(inode), inode);
-
         delegation = kmalloc(sizeof(*delegation), GFP_KERNEL);
         if (delegation == NULL)
                 return -ENOMEM;
@@ -154,6 +150,12 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
                         status = -EIO;
                 }
         }
+
+        /* Ensure we revalidate the attributes and page cache! */
+        spin_lock(&inode->i_lock);
+        nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
+        spin_unlock(&inode->i_lock);
+
         spin_unlock(&clp->cl_lock);
         kfree(delegation);
         return status;