From: Tejun Heo <tj@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-fsdevel@vger.kernel.org
Subject: Re: odd sysfs find behavior, was: Re: [PATCH v6 00/10] Implement NVMe Namespace Descriptor Identification
Date: Sun, 18 Jun 2017 06:32:39 -0400 [thread overview]
Message-ID: <20170618103239.GB28042@htj.duckdns.org> (raw)
In-Reply-To: <20170618102020.GA28042@htj.duckdns.org>
On Sun, Jun 18, 2017 at 06:20:20AM -0400, Tejun Heo wrote:
> Hello, Christoph.
>
> On Sun, Jun 18, 2017 at 09:33:05AM +0200, Christoph Hellwig wrote:
> > > Both straces attached (gzipped due to size). Note that this on a system
> > > with four NVMe devices, two of which are nvme-loop devices that have the
> > > uuid attribute.
> >
> > And now really attached..
>
> If you "cd /sys/kernel/debug/tracing; cd -" before doing the find,
> does it succeed the first time? It could be that the on-demand
> mounting of tracefs is giving incoherent results across the mounting
> and confusing find.
Before tracefs is automounted
File: '/sys/kernel/debug/tracing'
Size: 0 Blocks: 0 IO Block: 4096 directory
Device: 8h/8d Inode: 2054 Links: 3
Access: (0555/dr-xr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2017-06-18 03:21:26.241000000 -0700
Modify: 2017-06-18 03:21:26.241000000 -0700
Change: 2017-06-18 03:21:26.241000000 -0700
Birth: -
and after
File: '/sys/kernel/debug/tracing/'
Size: 0 Blocks: 0 IO Block: 4096 directory
Device: 9h/9d Inode: 1 Links: 6
Access: (0700/drwx------) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2017-06-18 03:21:26.241000000 -0700
Modify: 2017-06-18 03:21:26.241000000 -0700
Change: 2017-06-18 03:21:26.241000000 -0700
Birth: -
and it gets mounted while the first find is iterating through it.
Thanks.
--
tejun
next prev parent reply other threads:[~2017-06-18 10:32 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-07 9:45 [PATCH v6 00/10] Implement NVMe Namespace Descriptor Identification Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-07 9:45 ` [PATCH v6 01/10] scatterlist: add sg_zeroout_area() helper Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-07 9:49 ` Sagi Grimberg
2017-06-07 9:49 ` Sagi Grimberg
2017-06-08 7:41 ` Christoph Hellwig
2017-06-08 7:41 ` Christoph Hellwig
2017-06-08 7:46 ` Johannes Thumshirn
2017-06-08 7:46 ` Johannes Thumshirn
2017-06-07 9:45 ` [PATCH v6 02/10] nvmet: use NVME_IDENTIFY_DATA_SIZE Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-08 7:42 ` Christoph Hellwig
2017-06-08 7:42 ` Christoph Hellwig
2017-06-07 9:45 ` [PATCH v6 03/10] nvme: introduce NVMe Namespace Identification Descriptor structures Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-08 7:42 ` Christoph Hellwig
2017-06-08 7:42 ` Christoph Hellwig
2017-06-07 9:45 ` [PATCH v6 04/10] nvme: rename uuid to nguid in nvme_ns Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-07 9:45 ` [PATCH v6 05/10] nvmet: implement namespace identify descriptor list Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-07 9:50 ` Sagi Grimberg
2017-06-07 9:50 ` Sagi Grimberg
2017-06-08 7:44 ` Christoph Hellwig
2017-06-08 7:44 ` Christoph Hellwig
2017-06-08 7:49 ` Johannes Thumshirn
2017-06-08 7:49 ` Johannes Thumshirn
2017-06-08 7:52 ` Christoph Hellwig
2017-06-08 7:52 ` Christoph Hellwig
2017-06-08 7:55 ` Johannes Thumshirn
2017-06-08 7:55 ` Johannes Thumshirn
2017-06-08 7:57 ` Christoph Hellwig
2017-06-08 7:57 ` Christoph Hellwig
[not found] ` <MWHPR04MB10088151BCB7D7A209A739E686CD0@MWHPR04MB1008.namprd04.prod.outlook.com>
2017-06-12 16:19 ` Christoph Hellwig
2017-06-12 16:19 ` Christoph Hellwig
2017-06-07 9:45 ` [PATCH v6 06/10] nvmet: add uuid field to nvme_ns and populate via configfs Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-08 7:44 ` Christoph Hellwig
2017-06-08 7:44 ` Christoph Hellwig
2017-06-07 9:45 ` [PATCH v6 07/10] nvme: get list of namespace descriptors Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-08 7:46 ` Christoph Hellwig
2017-06-08 7:46 ` Christoph Hellwig
2017-06-07 9:45 ` [PATCH v6 08/10] nvme: provide UUID value to userspace Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-07 9:45 ` [PATCH v6 09/10] nvmet: allow overriding the NVMe VS via configfs Johannes Thumshirn
2017-06-07 9:45 ` Johannes Thumshirn
2017-06-08 7:47 ` Christoph Hellwig
2017-06-08 7:47 ` Christoph Hellwig
2017-06-15 16:31 ` [PATCH v6 00/10] Implement NVMe Namespace Descriptor Identification Christoph Hellwig
2017-06-15 16:31 ` Christoph Hellwig
2017-06-16 8:20 ` Johannes Thumshirn
2017-06-16 8:20 ` Johannes Thumshirn
2017-06-16 9:40 ` Christoph Hellwig
2017-06-16 9:40 ` Christoph Hellwig
2017-06-16 9:48 ` Johannes Thumshirn
2017-06-16 9:48 ` Johannes Thumshirn
2017-06-16 9:58 ` Christoph Hellwig
2017-06-16 9:58 ` Christoph Hellwig
2017-06-16 9:59 ` Johannes Thumshirn
2017-06-16 9:59 ` Johannes Thumshirn
2017-06-16 13:28 ` Linus Torvalds
2017-06-16 13:28 ` Linus Torvalds
2017-06-17 12:08 ` odd sysfs find behavior, was: " Christoph Hellwig
2017-06-18 1:12 ` Greg Kroah-Hartman
2017-06-18 7:32 ` Christoph Hellwig
[not found] ` <20170618073305.GB25797@lst.de>
2017-06-18 10:20 ` Tejun Heo
2017-06-18 10:32 ` Tejun Heo [this message]
2017-06-18 13:43 ` Christoph Hellwig
2017-06-19 17:59 ` Tejun Heo
2017-06-21 14:48 ` Greg Kroah-Hartman
2017-06-21 15:36 ` Tejun Heo
2017-06-22 0:21 ` Linus Torvalds
2017-06-22 0:06 ` Eric W. Biederman
2017-06-22 0:06 ` Eric W. Biederman
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