From: Theodore Ts'o <tytso@mit.edu>
To: The Ghost <the-ghost@inbox.ru>
Cc: linux-ext4@vger.kernel.org
Subject: Re: Does ext4 write anything during reading with relatime?
Date: Mon, 7 Dec 2015 18:19:13 -0500 [thread overview]
Message-ID: <20151207231913.GA3094@thunk.org> (raw)
In-Reply-To: <5665FD3D.1050603@inbox.ru>
On Tue, Dec 08, 2015 at 12:42:21AM +0300, The Ghost wrote:
>
> I just tried again. With relatime or noatime, the second drive spins up.
> Always. With read-only, it never spins up. And that doesn't make sense...
The superblock *does* get modified at mount time to update the last
mount time and the mount count in the superblock. But I've tested
using blktrace, and that's the only write I see after copying in a set
of test files, reading them (so that atime > mtime), and then
umounting the file system. I then started the blktrace, mounted the
file system, and read all of the files using "tar cvzf /tmp/foo.tar.gz /mnt".
Cheers,
- Ted
next prev parent reply other threads:[~2015-12-07 23:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-05 11:03 Does ext4 write anything during reading with relatime? The Ghost
2015-12-06 21:14 ` Theodore Ts'o
2015-12-07 21:42 ` The Ghost
2015-12-07 23:19 ` Theodore Ts'o [this message]
2015-12-08 0:44 ` The Ghost
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