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Date: Wed, 27 Nov 2013 23:23:45 +0100
From: Jan Kara <jack@suse.cz>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>, linux-ext4@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: CONFIG_EXT4_USE_FOR_EXT23 no space left on device
Message-ID: <20131127222345.GB27330@quack.suse.cz>
References: <CAMuHMdWgMrNQqq84AK+CGF6VFnLs38O-vyye4MFKNUO7b8iFMw@mail.gmail.com>
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On Wed 27-11-13 16:50:14, Geert Uytterhoeven wrote:
> To reduce kernel size, I disabled both CONFIG_EXT2_FS and
> CONFIG_EXT3_FS, and enabled CONFIG_EXT4_USE_FOR_EXT23.
> 
> Unfortunately the system behaves badly afterwards. It seems the file system
> is considered full: new files can be created, but no data can be written.
> Note that the file system is almost full, but root can still write more data
> using the real ext3 filesystem driver.
> 
> This is a v3.13-rc1-ish kernel.
> 
> Diff of dmesg and output of a few operations below:
  Thanks for report. Maybe the easiest would be if you gathered fs metadata
using "e2image -r <fs-device>", compressed it and made it available for
download. We can then debug ourselves where the accounting goes wrong.

									Honza
> 
> --- /tmp/good 2013-11-27 16:47:28.000000000 +0100
> +++ /tmp/bad 2013-11-27 16:47:31.000000000 +0100
> @@ -1,11 +1,13 @@
> -kjournald starting.  Commit interval 5 seconds
> -EXT3-fs (hda1): mounted filesystem with writeback data mode
> +
> +EXT4-fs (hda1): mounting ext3 file system using the ext4 subsystem
> +EXT4-fs (hda1): mounted filesystem with ordered data mode. Opts: (null)
>  VFS: Mounted root (ext3 filesystem) readonly on device 3:1.
> -Freeing unused kernel memory: 152K (0039d000 - 003c3000)
> +Freeing unused kernel memory: 152K (0037f000 - 003a5000)
>  random: nonblocking pool is initialized
>  Adding 137800k swap on /dev/hda2.  Priority:-1 extents:1 across:137800k
> -EXT3-fs (hda1): using internal journal
> -Unknown key: scancode = 0 ($00), keycode = 'numlock' ($12c)
> +EXT4-fs (hda1): re-mounted. Opts:
> +EXT4-fs (hda1): re-mounted. Opts: errors=remount-ro
> +EXT4-fs (hda1): re-mounted. Opts:
>  write cmd 0xE0 (STANDBY IMMEDIATE) not supported
>  hda: task_no_data_intr: status=0x41 { DriveReady Error }
>  hda: task_no_data_intr: error=0x04 { DriveStatusError }
> @@ -22,16 +24,9 @@ hda: possibly failed opcode: 0xe0
>  reboot: Power down
> 
>  atari:~# mount
> -/dev/hda1 on / type ext3 (rw,errors=remount-ro)
> -tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
> -proc on /proc type proc (rw,noexec,nosuid,nodev)
> -sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
> -tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
> -devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
> -rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> -atari:~# cat /proc/mounts
> +atari:~# cat /proc/mounts
>  rootfs / rootfs rw 0 0
> -/dev/root / ext3 rw,relatime,errors=remount-ro,barrier=1,data=writeback 0 0
> +/dev/root / ext3 rw,relatime,errors=remount-ro,data=ordered 0 0
>  tmpfs /lib/init/rw tmpfs rw,nosuid,relatime,mode=755 0 0
>  proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
>  sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
> @@ -40,13 +35,9 @@ devpts /dev/pts devpts rw,nosuid,noexec,
>  rpc_pipefs /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
>  atari:~# touch /tmp/x
>  atari:~# echo hello > /tmp/x
> -atari:~# cat /tmp/x
> -hello
> +-bash: echo: write error: No space left on device
>  atari:~# df -h
> -Filesystem            Size  Used Avail Use% Mounted on
> -/dev/hda1             870M  862M     0 100% /
> -tmpfs                 132M     0  132M   0% /lib/init/rw
> -tmpfs                 132M  4.0K  132M   1% /dev/shm
> +df: cannot read table of mounted file systems
>  atari:~# ls -l /etc/mtab
> --rw-r--r-- 1 root root 331 Nov 27 16:35 /etc/mtab
> +-rw-r--r-- 1 root root 0 Oct 27 15:32 /etc/mtab
>  atari:~# poweroff
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> --
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-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR