linux-kernel - [PATCH 0/5] initmpfs v2: use tmpfs instead of ramfs for rootfs

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Message-Id: <1374018312.366617@landley.net>
Date:	Tue, 16 Jul 2013 16:45:15 -0700 (PDT)
From:	Rob Landley <rob@...dley.net>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Jeff Layton <jlayton@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Jim Cromie <jim.cromie@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Sam Ravnborg <sam@...nborg.org>,
	Stephen Warren <swarren@...dia.com>
Subject: [PATCH 0/5] initmpfs v2: use tmpfs instead of ramfs for rootfs

Use tmpfs for rootfs when CONFIG_TMPFS=y and there's no root=.
Specify rootfstype=ramfs to get the old initramfs behavior.

The previous initramfs code provided a fairly crappy root filesystem:
didn't let you --bind mount directories out of it, reported zero
size/usage so it didn't show up in "df" and couldn't run things like
rpm that query available space before proceeding, would fill up all
available memory and panic the system if you wrote too much to it...

Using tmpfs instead provides a much better root filesystem.

Changes from v1: use test_and_set_bit() for "once" logic.

Changes from this morning's send: none, just hopefully not screwing
up the message-id this time trying to make it a reply to another message
via cut and paste...
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