linux-kernel - Re: [PATCH 2/4] btrfs: make open

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Date:   Sat, 18 Nov 2017 08:05:19 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Josef Bacik <josef@...icpanda.com>
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ast@...nel.org, kernel-team@...com, daniel@...earbox.net,
        linux-btrfs@...r.kernel.org, Josef Bacik <jbacik@...com>
Subject: Re: [PATCH 2/4] btrfs: make open_ctree error injectable


* Josef Bacik <josef@...icpanda.com> wrote:

> From: Josef Bacik <jbacik@...com>
> 
> This allows us to do error injection with BPF for open_ctree.
> 
> Signed-off-by: Josef Bacik <jbacik@...com>
> ---
>  fs/btrfs/disk-io.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index dfdab849037b..c6b4e1f07072 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -31,6 +31,7 @@
>  #include <linux/uuid.h>
>  #include <linux/semaphore.h>
>  #include <asm/unaligned.h>
> +#include <asm/kprobes.h>
>  #include "ctree.h"
>  #include "disk-io.h"
>  #include "hash.h"
> @@ -3283,6 +3284,7 @@ int open_ctree(struct super_block *sb,
>  		goto fail_block_groups;
>  	goto retry_root_backup;
>  }
> +BPF_ALLOW_ERROR_INJECTION(open_ctree);

Ok, this looks a lot better - except the random header inclusion dependency: if a 
facility is in the BPF_*() namespace then it should include <linux/bpf.h> and not 
a random asm/* header...

With that detail fixed:

  Acked-by: Ingo Molnar <mingo@...nel.org>

for the whole series.

Thanks,

	Ingo