Re: [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount

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To: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: Re: [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 29 Aug 2017 23:36:35 +0200
Cc: Christoph Hellwig <hch@xxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, "linux-nvdimm@xxxxxxxxxxxx" <linux-nvdimm@xxxxxxxxxxxx>, "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>, linux-xfs@xxxxxxxxxxxxxxx, linux-ext4 <linux-ext4@xxxxxxxxxxxxxxx>
In-reply-to: <CAPcyv4i2rS0sAxiJSVxFSHirsycaYofuxp3yPxeyB8xzsryx3g@mail.gmail.com>
References: <150389211501.25151.6477753201827914462.stgit@dwillia2-desk3.amr.corp.intel.com> <150389212075.25151.17146973298430877023.stgit@dwillia2-desk3.amr.corp.intel.com> <20170829212606.GC8608@lst.de> <CAPcyv4hA_vkSdZowaJ78FPCOhY2Z_iORX0B63=_RCCGdqack_g@mail.gmail.com> <CAPcyv4i2rS0sAxiJSVxFSHirsycaYofuxp3yPxeyB8xzsryx3g@mail.gmail.com>
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On Tue, Aug 29, 2017 at 02:35:27PM -0700, Dan Williams wrote:
> Actually, why not just do this directly in xfs_fs_mount()? I think I
> can refactor this to not touch mount_bdev() and put all the details in
> the per-fs mount/umount paths.

Yes, and just cache in in the fs specific superblock.

References:
- [PATCH v2 0/2] fs, dax: lookup dax_device at mount time
  - From: Dan Williams
- [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount
  - From: Dan Williams
- Re: [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount
  - From: Christoph Hellwig
- Re: [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount
  - From: Dan Williams
- Re: [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount
  - From: Dan Williams

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