linux-kernel - Re: [PATCH v4 2/4] fs: debugfs: Add write functionality to debugfs blobs

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Date:   Fri, 23 Jun 2023 10:09:20 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Avadhut Naik <avadhut.naik@....com>
Cc:     rafael@...nel.org, lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, yazen.ghannam@....com,
        alexey.kardashevskiy@....com, linux-kernel@...r.kernel.org,
        avadnaik@....com
Subject: Re: [PATCH v4 2/4] fs: debugfs: Add write functionality to debugfs
 blobs

On Wed, Jun 21, 2023 at 03:51:00AM +0000, Avadhut Naik wrote:
> From: Avadhut Naik <Avadhut.Naik@....com>
> 
> Currently, debugfs_create_blob() creates read-only debugfs binary blob
> files.
> 
> In some cases, however, userspace tools need to write variable length
> data structures into predetermined memory addresses. An example is when
> injecting Vendor-defined error types through the einj module. In such
> cases, the functionality to write to these blob files in debugfs would
> be desired since the mapping aspect can be handled within the modules
> with userspace tools only needing to write into the blob files.
> 
> Implement a write callback to enable writing to these blob files in
> debugfs.
> 
> Signed-off-by: Avadhut Naik <Avadhut.Naik@....com>
> Reviewed-by: Alexey Kardashevskiy <aik@....com>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>