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, 3 insertions, 1 deletions

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 9d5124166d20..3d9fccf4ef93 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1072,8 +1072,10 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
                 invalid &= ~NFS_INO_INVALID_DATA;
         if (data_stable)
                 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
-        if (!nfs_have_delegation(inode, FMODE_READ))
+        if (!nfs_have_delegation(inode, FMODE_READ) ||
+                        (nfsi->cache_validity & NFS_INO_REVAL_FORCED))
                 nfsi->cache_validity |= invalid;
+        nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED;
 
         return 0;
  out_changed: