linux-ext4 - [PATCH v2 0/2] fs, dax: lookup dax

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Message-ID: <150389211501.25151.6477753201827914462.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Sun, 27 Aug 2017 20:48:35 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     jack@...e.cz, "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-nvdimm@...ts.01.org, linux-xfs@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.com>, Theodore Ts'o <tytso@....edu>,
        linux-ext4@...r.kernel.org, hch@....de
Subject: [PATCH v2 0/2] fs, dax: lookup dax_device at mount time

Changes since v1:
* Move the lookup to mount time. (Christoph)

---

Christoph notes:

    I just noticed that we now do a fs_dax_get_by_host in every
    iomap_begin call for DAX. This function iterates a list, does a
    string compared and igrab. I really think we need to cache this in
    the superblock (possible even the fs superblock) similar to what we
    do for the block device.

This passes the libnvdimm unit tests.

---

Dan Williams (2):
      fs, xfs: perform dax_device lookup at mount
      ext2, ext4: use the super_block dax_device


 drivers/dax/super.c |   10 ++++++++++
 fs/ext2/inode.c     |   10 ++--------
 fs/ext4/inode.c     |   10 ++--------
 fs/super.c          |   26 +++++++++++++++++++++++---
 fs/xfs/xfs_aops.c   |   13 +++++++++++++
 fs/xfs/xfs_aops.h   |    1 +
 fs/xfs/xfs_buf.c    |    4 +++-
 fs/xfs/xfs_buf.h    |    3 ++-
 fs/xfs/xfs_iomap.c  |   10 +---------
 fs/xfs/xfs_super.c  |   21 +++++++++++++++++----
 include/linux/dax.h |    6 ++++++
 include/linux/fs.h  |    1 +
 12 files changed, 81 insertions(+), 34 deletions(-)