NFS: Make nfs_readdir revalidate less often
Make nfs_readdir revalidate only when we're at the beginning of the directory or
if the cached attributes have expired.
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index bd7e1cc..e474ca2b 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -818,7 +818,7 @@
nfs_readdir_descriptor_t my_desc,
*desc = &my_desc;
struct nfs_open_dir_context *dir_ctx = file->private_data;
- int res;
+ int res = 0;
dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
@@ -840,7 +840,8 @@
desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0;
nfs_block_sillyrename(dentry);
- res = nfs_revalidate_mapping(inode, file->f_mapping);
+ if (ctx->pos == 0 || nfs_attribute_cache_expired(inode))
+ res = nfs_revalidate_mapping(inode, file->f_mapping);
if (res < 0)
goto out;