[PATCH] Optimise NFS readdir hack slightly.

Avoid calling the underlying ->readdir() again when we reached the end
already; keep going round the loop only if we stopped due to our own
buffer being full.

[AV: tidy the things up a bit, while we are there]
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/nfsd/vfs.c

@@ -1891,7 +1891,6 @@ static int nfsd_buffered_readdir(struct file *file, filldir_t func,
 		if (!size)
 			break;
 
-
 		de = (struct buffered_dirent *)buf.dirent;
 		while (size > 0) {
 			offset = de->offset;
@@ -1908,7 +1907,9 @@ static int nfsd_buffered_readdir(struct file *file, filldir_t func,
 			size -= reclen;
 			de = (struct buffered_dirent *)((char *)de + reclen);
 		}
-		offset = vfs_llseek(file, 0, 1);
+		offset = vfs_llseek(file, 0, SEEK_CUR);
+		if (!buf.full)
+			break;
 	}
 
  done: