From: Trond Myklebust Date: Mon, 15 Jan 2007 13:56:29 -0500 NFS: Fix a readdir/lookup inefficiency. Make sure that nfs_readdir_lookup() handles negative dentries correctly. If d_lookup() returns a negative dentry, then we need to d_drop() that since readdir shows that it should be positive. Signed-off-by: Trond Myklebust --- fs/nfs/dir.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index bd269d2..db29c7f 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1123,8 +1123,14 @@ static struct dentry *nfs_readdir_lookup } name.hash = full_name_hash(name.name, name.len); dentry = d_lookup(parent, &name); - if (dentry != NULL) - return dentry; + if (dentry != NULL) { + /* Is this a positive dentry? */ + if (dentry->d_inode != NULL) + return dentry; + /* No, so d_drop to allow one to be created */ + d_drop(dentry); + dput(dentry); + } if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR)) return NULL; /* Note: caller is already holding the dir->i_mutex! */