On 2/7/13 3:28 PM, Autif Khan wrote:
> On Thu, Feb 7, 2013 at 3:58 PM, Theodore Ts'o <tytso@xxxxxxx> wrote:
>> On Thu, Feb 07, 2013 at 02:37:02PM -0500, Autif Khan wrote:
>>>
>>> That was precisely my ignorance. I did not know about barrier. Adding
>>> it during mount ro and remount rw seems to have fixed these issues.
>>
>> You also didn't say what file system you were using. Was it ext4?
>> ext3? ext2? What kernel version? On modern kernels barrier is
>> enabled by default for both ext3 and ext4.
>
> The filesystem is ext4. Kernel version is 3.2.0
>
> I could not grep -i barrier in the kernel config. How is barrier
> enabled or disabled in the kernel by default?
in ext4_fill_super():
if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
set_opt(sb, BARRIER);
It's a mount option, not a kernel config option.
-Eric
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