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Message-ID: <51141CCB.9060908@redhat.com> Date: Thu, 07 Feb 2013 15:29:47 -0600 From: Eric Sandeen <sandeen@...hat.com> To: Autif Khan <autif.mlist@...il.com> CC: "Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org Subject: Re: How can I flush all writes before yanking the power cable? On 2/7/13 3:28 PM, Autif Khan wrote: > On Thu, Feb 7, 2013 at 3:58 PM, Theodore Ts'o <tytso@....edu> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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