ext3 & ext4 FS support on mips device

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LukiTJ
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Joined: 02 Nov 2010
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PostPosted: Wed Jul 18, 2018 9:58    Post subject: ext3 & ext4 FS support on mips device Reply with quote
Hi,

is there any reason why on a atheros unit only a kernel module for ext2 is available? See also https://svn.dd-wrt.com/ticket/5813
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Per Yngve Berg
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Joined: 13 Aug 2013
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PostPosted: Wed Jul 18, 2018 13:19    Post subject: Reply with quote
Both of them mounts on my R7800.
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htismaqe
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Joined: 05 Nov 2015
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PostPosted: Wed Jul 18, 2018 13:20    Post subject: Reply with quote
Per Yngve Berg wrote:
Both of them mounts on my R7800.


Good to know. I'm getting ready to install YAMon on my R7800.
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mrjcd
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Joined: 31 Jan 2015
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PostPosted: Wed Jul 18, 2018 13:26    Post subject: Reply with quote
The EA8500 will mount NTFS, FAT32, Ext2, Ext3, or Ext4 Smile
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LukiTJ
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PostPosted: Wed Jul 18, 2018 13:51    Post subject: Reply with quote
Good to know not every atheros unit has this restriction. The Buffalo WZR-HP-AG300H comes with ext2 and vfat support as far as I can tell from the available kernel modules. My other Buffalo Router, based on a Broadcom Chipset, has more file-system options available, too.
Why aren't these kernel modules included on the WZR-HP-AG300H?
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ian5142
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Joined: 23 Oct 2013
Posts: 2319
Location: Canada
PostPosted: Thu Jul 19, 2018 2:33    Post subject: Flash space Reply with quote
It is all based on Flash space availability. Kernel modules take up space and adding more support on an 8MB flash is hard when a lot of it is used up by core kernel modules for the wireless, etc.
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Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

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Linksys EA6400 - Gateway, QoS
Asus N66U - AP
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MediaTek
UBNT EdgeRouter X - switch
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LukiTJ
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PostPosted: Thu Jul 19, 2018 8:25    Post subject: Reply with quote
The WZR-HP-AG300H has 32MB of flash space and my current image size is 29757468 bytes. Gonna Check a recent image where the sized increased to ~31MB
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LukiTJ
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PostPosted: Thu Jul 19, 2018 11:08    Post subject: Reply with quote
Latest Release (DD-WRT v3.0-r36330) also only includes ext2 module Sad

ls -l /lib/modules/3.10.108-d3/ext*
-rw-r--r-- 1 root root 63740 Jul 16 04:31 /lib/modules/3.10.108-d3/ext2.ko
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al_c
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Joined: 13 Apr 2013
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PostPosted: Sun Sep 16, 2018 19:31    Post subject: Reply with quote
htismaqe wrote:
Per Yngve Berg wrote:
Both of them mounts on my R7800.


Good to know. I'm getting ready to install YAMon on my R7800.


I recommend ext4 when setting things up for YAMon. In the past, when my USB drive was formatted to ext2, I occasionally ended up with a badly corrupted USB drive if there was an unexpected reboot (power failure). I have *not* had that problem since moving to ext4.

However, some variants have removed support for ext 3 and/or ext4 so that the firmware fits onto routers with limited memory. In that situation, ext2 may be fine but caveat emptor...

Al
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