Date: Thu, 6 Mar 2014 13:03:27 +0800 From: Jia-Shiun Li <jiashiun@gmail.com> To: Warner Losh <imp@bsdimp.com> Cc: George Rosamond <george@ceetonetechnology.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: TMPFS in kernels Message-ID: <CAHNYxxOAcjiU0C6of9wBeHyXiCCgdJWt2Y8BpV%2BDyyD=fxdG2g@mail.gmail.com> In-Reply-To: <C1297CD6-C313-4516-BA51-71C427C45B79@bsdimp.com> References: <5313D0FE.8010008@ceetonetechnology.com> <1393818974.1149.270.camel@revolution.hippie.lan> <5314016B.1000107@ceetonetechnology.com> <20140303061136.GB85204@zibbi.meraka.csir.co.za> <CAHNYxxPvRwmSDw8M9znFi1QsDq%2BR=Ash7AODWTct4Q_TBdOCVQ@mail.gmail.com> <C1297CD6-C313-4516-BA51-71C427C45B79@bsdimp.com>
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On Tue, Mar 4, 2014 at 10:48 PM, Warner Losh <imp@bsdimp.com> wrote:
>
> On Mar 4, 2014, at 3:30 AM, Jia-Shiun Li <jiashiun@gmail.com> wrote:
>
>> I remember hacking it a while ago to adopt tmpfs instead on my pxeboot
>> test environment. It only requires changing the line mdmfs mounting md t=
o
>> 'mount -t tmpfs' (plus mount options), and everything else will work as =
usual.
>
> I=E2=80=99ll have to give it a spin on NanoBSD then, at least as an optio=
n=E2=80=A6
>
The actual patch & result pasted below to save you some time.
Only tested on x86 pxeboot though.
-----8<----------8<----------8<-----
% diff -bu /usr/src/etc/rc.initdiskless
/b/tftpboot/FreeBSD/install/etc/rc.initdiskless
--- /usr/src/etc/rc.initdiskless 2013-04-11 21:03:31.000000000 +0800
+++ /b/tftpboot/FreeBSD/install/etc/rc.initdiskless 2014-03-06
12:43:47.000000000 +0800
@@ -198,7 +198,10 @@
# Create a generic memory disk
#
mount_md() {
- /sbin/mdmfs -S -i 4096 -s $1 -M md $2
+# /sbin/mdmfs -S -i 4096 -s $1 -M md $2
+ local tmpfs_size
+ tmpfs_size=3D$(($1 * 1024))
+ /sbin/mount -t tmpfs -osize=3D$tmpfs_size tmpfs $2
}
# Create the memory filesystem if it has not already been created
% cat df
Filesystem Size Used Avail
Capacity Mounted on
192.168.233.1:/b/tftpboot/FreeBSD/install/ 29G 17G 9.8G 63% =
/
devfs 1.0K 1.0K 0B
100% /dev
tmpfs 10M 2.6M 7.4M
26% /etc
tmpfs 10M 180K 9.8M
2% /var
/dev/md0 19M 24K 17M
0% /tmp
% cat mount
192.168.233.1:/b/tftpboot/FreeBSD/install/ on / (nfs, read-only)
devfs on /dev (devfs, local, multilabel)
tmpfs on /etc (tmpfs, local)
tmpfs on /var (tmpfs, local)
/dev/md0 on /tmp (ufs, local)
-Jia-Shiun.
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