linux-kernel - Re: [PATCH v4 08/11] fs/9p: Add new mount modes

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Date:   Sat, 18 Feb 2023 17:46:56 +0900
From:   asmadeus@...ewreck.org
To:     Eric Van Hensbergen <ericvh@...nel.org>
Cc:     v9fs-developer@...ts.sourceforge.net, rminnich@...il.com,
        lucho@...kov.net, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux_oss@...debyte.com
Subject: Re: [PATCH v4 08/11] fs/9p: Add new mount modes

Eric Van Hensbergen wrote on Sat, Feb 18, 2023 at 12:33:20AM +0000:
> Add some additional mount modes for cache management including
> specifying directio as a mount option and an option for ignore
> qid.version for determining whether or not a file is cacheable.

direct io is standard enough but ignore QV probably warrants a comment
in the code and not just a word in the commit message.

I see you've added these in Documentation/filesystems/9p.rst in
the "writeback mode fixes" -- I guess we can live with commits
introducing options not being 100% coherent within the series (the
implementation also comes in that fixes commit), but perhaps a '/*
ignore qid.version */' comment in the enum?

> diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
> index d90141d25d0d..48c7614c9333 100644
> --- a/fs/9p/v9fs.h
> +++ b/fs/9p/v9fs.h
> @@ -37,7 +37,10 @@ enum p9_session_flags {
>  	V9FS_ACCESS_USER	= 0x08,
>  	V9FS_ACCESS_CLIENT	= 0x10,
>  	V9FS_POSIX_ACL		= 0x20,
> -	V9FS_NO_XATTR		= 0x40
> +	V9FS_NO_XATTR		= 0x40,
> +	V9FS_IGNORE_QV		= 0x80,
> +	V9FS_DIRECT_IO		= 0x100,
> +	V9FS_SYNC			= 0x200

... And while we're here, indentation seems off on sync

-- 
Dominique