From: Jeff Garzik <jeff@garzik.org>
To: Eric Sandeen <sandeen@redhat.com>
Cc: "Fernando Luis Vázquez Cao" <fernando@oss.ntt.co.jp>,
"Jan Kara" <jack@suse.cz>, "Theodore Tso" <tytso@MIT.EDU>,
"Alan Cox" <alan@lxorguk.ukuu.org.uk>,
"Pavel Machek" <pavel@suse.cz>,
"kernel list" <linux-kernel@vger.kernel.org>,
"Jens Axboe" <jens.axboe@oracle.com>,
fernando@kic.ac.jp, "Ric Wheeler" <rwheeler@redhat.com>
Subject: Re: vfs: Add MS_FLUSHONFSYNC mount flag
Date: Thu, 12 Feb 2009 12:29:52 -0500 [thread overview]
Message-ID: <49945C90.3010104@garzik.org> (raw)
In-Reply-To: <499458C1.90105@redhat.com>
Eric Sandeen wrote:
> Fernando Luis Vázquez Cao wrote:
>> This mount flag will be used to determine whether the block device's write
>> cache should be flush or not on fsync()/fdatasync().
>>
>> Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
>> ---
>
> Again, apologies for chiming in late.
>
> But wouldn't it be better to make this a block device property rather
> than a new filesystem mount option?
>
> That way the filesystem can always do "the right thing" and call the
> blkdev flush on fsync.
>
> The block device *could* choose to ignore this in hardware if it knows
> it's built with a nonvolatile write cache or if it has no write cache.
That would certainly be my preference -- turn this ON by default, and
them if a layer NEEDS to ignore it, it can.
Jeff
next prev parent reply other threads:[~2009-02-12 17:30 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-13 13:14 ext2 + -osync: not as easy as it seems Pavel Machek
2009-01-13 13:45 ` Alan Cox
2009-01-13 14:03 ` Theodore Tso
2009-01-13 14:07 ` Jens Axboe
2009-01-13 14:26 ` [PATCH] block: Fix documentation for blkdev_issue_flush() Theodore Ts'o
2009-01-13 14:28 ` Jens Axboe
2009-01-13 14:30 ` ext2 + -osync: not as easy as it seems Jan Kara
2009-01-13 14:46 ` Theodore Tso
2009-01-14 3:37 ` Fernando Luis Vázquez Cao
2009-01-14 10:35 ` Jan Kara
2009-01-14 13:21 ` Theodore Tso
2009-01-14 14:05 ` Jan Kara
2009-01-14 14:08 ` Jens Axboe
2009-01-14 14:34 ` Theodore Tso
2009-01-14 14:43 ` Jens Axboe
2009-02-12 16:43 ` Eric Sandeen
2009-02-16 12:09 ` Jens Axboe
2009-01-14 14:12 ` Theodore Tso
2009-01-14 14:37 ` Jan Kara
2009-01-14 16:59 ` Theodore Tso
2009-01-15 12:06 ` Fernando Luis Vázquez Cao
2009-01-15 23:45 ` Jan Kara
2009-01-16 12:31 ` Fernando Luis Vázquez Cao
2009-01-16 13:55 ` ext3: call blkdev_issue_flush on fsync Fernando Luis Vázquez Cao
2009-01-16 16:30 ` Jan Kara
2009-01-17 9:47 ` Fernando Luis Vázquez Cao
2009-01-17 10:00 ` Fernando Luis Vázquez Cao
2009-01-19 12:03 ` Jan Kara
2009-01-28 9:45 ` Fernando Luis Vázquez Cao
2009-01-28 9:55 ` Jan Kara
2009-02-12 10:33 ` Fernando Luis Vázquez Cao
2009-02-12 10:35 ` vfs: Improve readability off mount flag definitins by using offsets Fernando Luis Vázquez Cao
2009-02-12 10:36 ` vfs: Add MS_FLUSHONFSYNC mount flag Fernando Luis Vázquez Cao
2009-02-12 17:13 ` Eric Sandeen
2009-02-12 17:29 ` Jeff Garzik [this message]
2009-02-14 15:36 ` Christoph Hellwig
2009-02-15 7:23 ` Fernando Luis Vázquez Cao
2009-02-15 22:54 ` Theodore Tso
2009-02-16 4:29 ` Eric Sandeen
2009-02-16 7:47 ` Fernando Luis Vázquez Cao
2009-02-16 7:47 ` Fernando Luis Vázquez Cao
2009-02-12 21:23 ` Jan Kara
2009-02-12 21:30 ` Eric Sandeen
2009-02-13 1:47 ` Fernando Luis Vázquez Cao
2009-02-13 6:07 ` Eric Sandeen
2009-02-13 2:23 ` Theodore Tso
2009-02-22 14:15 ` Pavel Machek
2009-02-22 20:51 ` Eric Sandeen
2009-02-22 23:19 ` Theodore Tso
2009-02-22 23:42 ` Jeff Garzik
2009-02-22 23:46 ` Jeff Garzik
2009-02-23 1:23 ` Theodore Tso
2009-02-13 1:14 ` Fernando Luis Vázquez Cao
2009-02-13 6:20 ` Eric Sandeen
2009-02-13 10:36 ` Fernando Luis Vázquez Cao
2009-02-13 12:20 ` Dave Chinner
2009-02-13 16:29 ` Fernando Luis Vazquez Cao
2009-02-14 11:24 ` Dave Chinner
2009-02-14 13:03 ` Fernando Luis Vázquez Cao
2009-02-14 13:19 ` Fernando Luis Vázquez Cao
2009-02-15 2:48 ` Dave Chinner
2009-02-15 7:11 ` Fernando Luis Vázquez Cao
2009-02-12 10:37 ` util-linux: Add new mount options flushonfsync and noflushonfsync to mount Fernando Luis Vázquez Cao
2009-02-12 10:38 ` util-linux: Add explanation for new mount options flushonfsync and noflushonfsync to mount(8) man page Fernando Luis Vázquez Cao
2009-02-12 10:38 ` block: Add block_flush_device() Fernando Luis Vázquez Cao
2009-02-12 10:39 ` ext3: call blkdev_issue_flush on fsync Fernando Luis Vázquez Cao
2009-02-12 10:40 ` ext4: " Fernando Luis Vázquez Cao
2009-02-15 22:46 ` Theodore Tso
2009-02-16 7:09 ` Fernando Luis Vázquez Cao
2009-02-16 7:25 ` [PATCH 1/3] block: Add block_flush_device() Fernando Luis Vázquez Cao
2009-02-16 7:29 ` [2/3] ext3: call block_flush_device() on fsync Fernando Luis Vázquez Cao
2009-02-16 7:31 ` [PATCH 3/3] ext4: " Fernando Luis Vázquez Cao
2009-01-16 13:59 ` ext4: call blkdev_issue_flush " Fernando Luis Vázquez Cao
2009-01-13 14:42 ` ext2 + -osync: not as easy as it seems Pavel Machek
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