linux-kernel - Re: [PATCH 2/2] Unionfs: clarify usage.txt mount options

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Date:	Fri, 14 Dec 2007 19:32:46 +0300
From:	Michael Tokarev <mjt@....msk.ru>
To:	Erez Zadok <ezk@...sunysb.edu>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, viro@....linux.org.uk,
	hch@...radead.org, Jim Kissel <jlk@...l.eu>
Subject: Re: [PATCH 2/2] Unionfs: clarify usage.txt mount options

Erez Zadok wrote:

> --- a/Documentation/filesystems/unionfs/usage.txt
> +++ b/Documentation/filesystems/unionfs/usage.txt
[]
> +OPTIONS can be any legal combination one of:
                                       ^^^^^
A small typo.

> +
> +- ro		# mount file system read-only
> +- rw		# mount file system read-write
> +- remount	# remount the file system (see Branch Management below)
> +- incgen	# increment generation no. (see Cache Consistency below)
> +
> +BRANCH-OPTIONS can be either (1) a list of branches given to the "dirs="
> +option, or (2) a list of individual branch manipulation commands, described
> +in the "Branch Management" section below.

Should this (2) choice mention remount operation somehow?
It seems the (2) case is about remount only.

> +The "dirs=" option takes a colon-delimited list of directories to compose
> +the union, with an optional branch mode for each of those directories.
> +Directories that come earlier (specified first, on the left) in the list
> +have a higher precedence than those which come later.  Additionally,

By the way, what is "precedence" here?  I mean, will unionfs always
write to the first rw branch, or is it possible to write to some
deeper branch too?

And finally, can a first (and all of them as well) branch be ro?

Thanks.

/mjt
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