Message-ID: <4762B02E.7030102@msgid.tls.msk.ru>
Date: Fri, 14 Dec 2007 19:32:46 +0300
From: Michael Tokarev <mjt@tls.msk.ru>
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To: Erez Zadok <ezk@cs.sunysb.edu>
CC: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
       linux-fsdevel@vger.kernel.org, viro@ftp.linux.org.uk, hch@infradead.org,
       Jim Kissel <jlk@osml.eu>
Subject: Re: [PATCH 2/2] Unionfs: clarify usage.txt mount options
References: <11976472813872-git-send-email-ezk@cs.sunysb.edu> <11976472822359-git-send-email-ezk@cs.sunysb.edu>
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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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