[readdir] introduce ->iterate(), ctx->pos, dir_emit()

New method - ->iterate(file, ctx).  That's the replacement for ->readdir();
it takes callback from ctx->actor, uses ctx->pos instead of file->f_pos and
calls dir_emit(ctx, ...) instead of filldir(data, ...).  It does *not*
update file->f_pos (or look at it, for that matter); iterate_dir() does the
update.

Note that dir_emit() takes the offset from ctx->pos (and eventually
filldir_t will lose that argument).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 7cb190426cec..6c8ef1dd4bdf 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -272,7 +272,7 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
                 goto out;
 
         error = -EINVAL;
-        if (!file->f_op->readdir)
+        if (!file->f_op->readdir && !file->f_op->iterate)
                 goto out_close;
 
         buffer.name = name;