Re: [PATCH resend] VFS: simplify seq_file iteration code and interface

From: Jonathan Corbet
Date: Mon Apr 30 2018 - 14:03:22 EST

On Mon, 30 Apr 2018 11:50:04 +1000
NeilBrown <neilb@xxxxxxxx> wrote:

> This patch simplifies the interface for first/next iteration and
> simplifies the code, while maintaining complete backward
> compatability. Now:
> - if ->start() is given a pos of zero, it should return an iterator
> placed at the start of the sequence
> - if ->start() is given a non-zero pos, it should return the iterator
> in the same state it was after the last ->start or ->next.
> This is particularly useful for interators which walk the multiple
> chains in a hash table, e.g. using rhashtable_walk*. See
> fs/gfs2/glock.c and drivers/staging/lustre/lustre/llite/vvp_dev.c

For the docs part:

Acked-by: Jonathan Corbet <corbet@xxxxxxx>