From: Christoph Hellwig <hch@lst.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tejun Heo <tj@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-fsdevel@vger.kernel.org
Subject: odd sysfs find behavior, was: Re: [PATCH v6 00/10] Implement NVMe Namespace Descriptor Identification
Date: Sat, 17 Jun 2017 14:08:14 +0200 [thread overview]
Message-ID: <20170617120814.GA13236@lst.de> (raw)
In-Reply-To: <CA+55aFxJ0bpRFsnZFe6sh2i4jxNdYmDi_6RZx2CQQdmQ_HU3wQ@mail.gmail.com>
On Fri, Jun 16, 2017 at 10:28:28PM +0900, Linus Torvalds wrote:
> Hmm. The *traditional* reason for this particular 'find' oddity is
> that find has an optimization which will look at the nlink count of a
> directory to decide how many subdirectories it can have.
It looks like sysfs maintains i_nlink properly as far as I can tell.
But I noticed another things that's even more weird:
root@testvm:~/nvmetcli# find /sys -name uuid
root@testvm:~/nvmetcli# find /sys -name uuid
/sys/devices/virtual/nvme-fabrics/ctl/nvme2/nvme2n1/uuid
so just repeating the find a second time makes it work! Looks like
there is some sort of lazy population scheme in sysfs..
next prev parent reply other threads:[~2017-06-17 12:08 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 ` Christoph Hellwig [this message]
2017-06-18 1:12 ` odd sysfs find behavior, was: " 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
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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