linux-ext4 - Re: simplify ext4_sb_read

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Date:   Mon, 30 May 2022 22:39:01 -0400
From:   "Stephen E. Baker" <baker.stephen.e@...il.com>
To:     Dave Chinner <david@...morbit.com>
Cc:     Gabriel Krisman Bertazi <krisman@...labora.com>,
        linux-ext4@...r.kernel.org
Subject: Re: simplify ext4_sb_read_encoding regression

On Mon, May 30, 2022 at 8:56 PM Dave Chinner <david@...morbit.com> wrote:
>
> On Mon, May 30, 2022 at 06:27:29PM -0400, Stephen E. Baker wrote:
> > I don't have any output to provide unfortunately. It fails before the
> > backlight turns on, and nothing is written to disk. I seem to remember
> > that someone else at Collabora had figured out a way to get a serial
> > console on this device - perhaps Tomeu. I'm not equipped for that
> > personally, particularly if it involves soldering.
>
> https://www.kernel.org/doc/html/latest/networking/netconsole.html
>
Thanks for the tip, it seems my usb ethernet card comes up a little too
late for netconsole; but if there was any way to adjust the boot order it
would work well. Alternatively, any other method of exporting printk
messages.

[    4.803080] netpoll: netconsole: local port 6665
[    4.808242] netpoll: netconsole: local IPv4 address 0.0.0.0
[    4.814476] netpoll: netconsole: interface 'eth0'
[    4.819728] netpoll: netconsole: remote port 6666
[    4.824988] netpoll: netconsole: remote IPv4 address 192.168.1.42
[    4.831794] netpoll: netconsole: remote ethernet address 00:30:67:53:8f:79
[    4.839593] netpoll: netconsole: eth0 doesn't exist, aborting
[    4.846023] netconsole: cleaning up
...
[    6.528582] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    6.536623] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks:
(500 GB/466 GiB)
[    6.546386] sd 0:0:0:0: [sda] Write Protect is off
[    6.551754] sd 0:0:0:0: [sda] Mode Sense: 37 00 00 08
[    6.554465] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[    6.566947] sd 0:0:0:0: [sda] Optimal transfer size 33553920 bytes
[    6.632458]  sda: sda1 sda2
[    6.708529] sd 0:0:0:0: [sda] Attached SCSI disk
[    6.724058] EXT4-fs (sda2): Using encoding defined by superblock:
utf8-12.1.0 with flags 0x0
[    6.733988] EXT4-fs (sda2): Using encoding defined by superblock:
utf8-12.1.0 with flags 0x0
[    6.743851] EXT4-fs (sda2): Using encoding defined by superblock:
utf8-12.1.0 with flags 0x0
[    6.800054] EXT4-fs (sda2): recovery complete
[    6.804967] EXT4-fs (sda2): mounted filesystem with ordered data
mode. Opts: (null). Quota mode: none.
[    6.815428] VFS: Mounted root (ext4 filesystem) on device 8:2.
...
[    7.045492] usb 8-1.4.1: New USB device found, idVendor=0bda,
idProduct=8153, bcdDevice=31.00
[    7.055094] usb 8-1.4.1: New USB device strings: Mfr=1, Product=2,
SerialNumber=6
[    7.063475] usb 8-1.4.1: Product: USB 10/100/1000 LAN
[    7.069193] usb 8-1.4.1: Manufacturer: Realtek
[    7.074266] usb 8-1.4.1: SerialNumber: 001000001
...
[    7.499107] r8152 8-1.4.1:1.0: load rtl8153b-2 v1 10/23/19 successfully
[    7.553995] r8152 8-1.4.1:1.0 eth0: v1.12.11