On Mon, 2015-08-24 at 21:28 -0400, Chris Mason wrote:
> This is what btrfs already does for O_DIRECT plus compressed, or
> other
> cases where people don't want their applications to break on top of
> new
> features that aren't quite compatible with it.
I do not know how much of direct IO we can d
Chris Mason writes:
>> I do think we should at least document what file systems appear to be
>> doing. Here's a man page patch for open (generated with extra context
>> for easier reading). Let me know what you think.
>
> We shouldn't be ignoring it, but instead call it similar to O_DSYNC plus
On Tue, Aug 25, 2015 at 10:00:58AM -0400, Jeff Moyer wrote:
> Dave Chinner writes:
>
> > On Mon, Aug 24, 2015 at 01:19:24PM -0400, Jeff Moyer wrote:
> >> Brian Norris writes:
> >>
> >> > On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
> >> >> Now, some user-space fails when di
Dave Chinner writes:
> On Mon, Aug 24, 2015 at 01:19:24PM -0400, Jeff Moyer wrote:
>> Brian Norris writes:
>>
>> > On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
>> >> Now, some user-space fails when direct I/O is not supported.
>> >
>> > I think the whole argument rested on
On Tue, Aug 25, 2015 at 09:46:11AM +1000, Dave Chinner wrote:
> On Mon, Aug 24, 2015 at 01:19:24PM -0400, Jeff Moyer wrote:
> > Brian Norris writes:
> >
> > > On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
> > >> Now, some user-space fails when direct I/O is not supported.
> >
On Mon, Aug 24, 2015 at 01:19:24PM -0400, Jeff Moyer wrote:
> Brian Norris writes:
>
> > On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
> >> Now, some user-space fails when direct I/O is not supported.
> >
> > I think the whole argument rested on what it means when "some user s
Brian Norris writes:
> On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
>> Now, some user-space fails when direct I/O is not supported.
>
> I think the whole argument rested on what it means when "some user space
> fails"; apparently that "user space" is just a test suite (which
On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
> Now, some user-space fails when direct I/O is not supported.
I think the whole argument rested on what it means when "some user space
fails"; apparently that "user space" is just a test suite (which
can/should be fixed).
> We can
Am 24.08.2015 um 11:34 schrieb Artem Bityutskiy:
> On Mon, 2015-08-24 at 01:03 -0700, Christoph Hellwig wrote:
>> On Mon, Aug 24, 2015 at 11:02:42AM +0300, Artem Bityutskiy wrote:
>>> Back when we were writing UBIFS, we did not need direct IO, so we
>>> did
>>> not implement it. But yes, probably s
On Mon, 2015-08-24 at 01:03 -0700, Christoph Hellwig wrote:
> On Mon, Aug 24, 2015 at 11:02:42AM +0300, Artem Bityutskiy wrote:
> > Back when we were writing UBIFS, we did not need direct IO, so we
> > did
> > not implement it. But yes, probably someone who cares could just
> > try
> > implementing
On Mon, Aug 24, 2015 at 03:17:10PM +0800, Dongsheng Yang wrote:
> >Richard, you mention this was suggested by Dave, could you please pint
> >to the discussion, if possible?
>
> http://lists.infradead.org/pipermail/linux-mtd/2015-August/060702.html
>
> That's in a discussion I want to introduce ub
On 08/24/2015 04:03 PM, Christoph Hellwig wrote:
On Mon, Aug 24, 2015 at 11:02:42AM +0300, Artem Bityutskiy wrote:
Back when we were writing UBIFS, we did not need direct IO, so we did
not implement it. But yes, probably someone who cares could just try
implementing this feature.
So I think th
On Mon, Aug 24, 2015 at 11:02:42AM +0300, Artem Bityutskiy wrote:
> Back when we were writing UBIFS, we did not need direct IO, so we did
> not implement it. But yes, probably someone who cares could just try
> implementing this feature.
So I think the answer here is to implement a real version in
On Mon, 2015-08-24 at 00:53 -0700, Christoph Hellwig wrote:
> On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
> > 1. we are the only FS erroring out on O_DIRECT
> > 2. other file-systems not supporting direct IO just fake it
>
> There are lots of file systems not supporting O_DIR
On Mon, Aug 24, 2015 at 10:13:25AM +0300, Artem Bityutskiy wrote:
> 1. we are the only FS erroring out on O_DIRECT
> 2. other file-systems not supporting direct IO just fake it
There are lots of file systems not supporting O_DIRECT, but ubifs might
be the most common one. Given that O_DIRECT impl
On 08/24/2015 03:17 PM, Dongsheng Yang wrote:
On 08/24/2015 03:18 PM, Artem Bityutskiy wrote:
On Thu, 2015-08-20 at 15:34 +0300, Artem Bityutskiy wrote:
On Thu, 2015-08-20 at 13:40 +0200, Richard Weinberger wrote:
Basically, we need to see what is the "common practice" here, and
follow it. Thi
On 08/24/2015 03:18 PM, Artem Bityutskiy wrote:
On Thu, 2015-08-20 at 15:34 +0300, Artem Bityutskiy wrote:
On Thu, 2015-08-20 at 13:40 +0200, Richard Weinberger wrote:
Basically, we need to see what is the "common practice" here, and
follow it. This requires a small research. What would be the
On Thu, 2015-08-20 at 15:34 +0300, Artem Bityutskiy wrote:
> On Thu, 2015-08-20 at 13:40 +0200, Richard Weinberger wrote:
> > > Basically, we need to see what is the "common practice" here, and
> > > follow it. This requires a small research. What would be the most
> > > popular Linux FS which does
On Thu, 2015-08-20 at 13:49 -0700, Brian Norris wrote:
> Pardon the innocent bystander's comment, but:
>
> On Thu, Aug 20, 2015 at 01:40:02PM +0200, Richard Weinberger wrote:
> > Am 20.08.2015 um 13:31 schrieb Artem Bityutskiy:
> > > On Thu, 2015-08-20 at 11:00 +0800, Dongsheng Yang wrote:
> > > >
Pardon the innocent bystander's comment, but:
On Thu, Aug 20, 2015 at 01:40:02PM +0200, Richard Weinberger wrote:
> Am 20.08.2015 um 13:31 schrieb Artem Bityutskiy:
> > On Thu, 2015-08-20 at 11:00 +0800, Dongsheng Yang wrote:
> >> On 08/20/2015 04:35 AM, Richard Weinberger wrote:
> >>> Currently U
On Thu, 2015-08-20 at 13:40 +0200, Richard Weinberger wrote:
> > Basically, we need to see what is the "common practice" here, and
> > follow it. This requires a small research. What would be the most
> > popular Linux FS which does not support direct I/O? Can we check
> > what
> > it does?
>
> A
Artem,
Am 20.08.2015 um 13:31 schrieb Artem Bityutskiy:
> On Thu, 2015-08-20 at 11:00 +0800, Dongsheng Yang wrote:
>> On 08/20/2015 04:35 AM, Richard Weinberger wrote:
>>> Currently UBIFS does not support direct IO, but some applications
>>> blindly use the O_DIRECT flag.
>>> Instead of failing up
On Thu, 2015-08-20 at 11:00 +0800, Dongsheng Yang wrote:
> On 08/20/2015 04:35 AM, Richard Weinberger wrote:
> > Currently UBIFS does not support direct IO, but some applications
> > blindly use the O_DIRECT flag.
> > Instead of failing upon open() we can do better and fall back
> > to buffered IO.
On Wed, 2015-08-19 at 22:35 +0200, Richard Weinberger wrote:
> Currently UBIFS does not support direct IO, but some applications
> blindly use the O_DIRECT flag.
> Instead of failing upon open() we can do better and fall back
> to buffered IO.
>
> Cc: Dongsheng Yang
> Cc: dedeki...@gmail.com
> Su
On 08/20/2015 02:42 PM, Richard Weinberger wrote:
Yang, (Sorry if I've used your last name lately)
Haha, that's fine. My friends in China all call me Dongsheng. :)
Am 20.08.2015 um 05:00 schrieb Dongsheng Yang:
On 08/20/2015 04:35 AM, Richard Weinberger wrote:
Currently UBIFS does not suppo
Yang, (Sorry if I've used your last name lately)
Am 20.08.2015 um 05:00 schrieb Dongsheng Yang:
> On 08/20/2015 04:35 AM, Richard Weinberger wrote:
>> Currently UBIFS does not support direct IO, but some applications
>> blindly use the O_DIRECT flag.
>> Instead of failing upon open() we can do bet
On 08/20/2015 04:35 AM, Richard Weinberger wrote:
Currently UBIFS does not support direct IO, but some applications
blindly use the O_DIRECT flag.
Instead of failing upon open() we can do better and fall back
to buffered IO.
H, to be honest, I am not sure we have to do it as Dave
suggested.
Currently UBIFS does not support direct IO, but some applications
blindly use the O_DIRECT flag.
Instead of failing upon open() we can do better and fall back
to buffered IO.
Cc: Dongsheng Yang
Cc: dedeki...@gmail.com
Suggested-by: Dave Chinner
Signed-off-by: Richard Weinberger
---
fs/ubifs/fi
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