[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: David Woodhouse <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

fs/nfsd/vfs.c

···
 		if (!size)
 			break;
 
-
 		de = (struct buffered_dirent *)buf.dirent;
 		while (size > 0) {
 			offset = de->offset;
···
 			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: