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| author | Dan Williams | 2017-08-25 00:12:50 +0200 |
|---|---|---|
| committer | Dan Williams | 2017-08-31 18:31:47 +0200 |
| commit | 486aff5e04823bb1e60c4045226eb244024b8420 (patch) | |
| tree | c0cc960b998086e92873d918f203a5e737e97db6 /fs/xfs/xfs_buf.c | |
| parent | dax: introduce a fs_dax_get_by_bdev() helper (diff) | |
| download | kernel-qcow2-linux-486aff5e04823bb1e60c4045226eb244024b8420.tar.gz kernel-qcow2-linux-486aff5e04823bb1e60c4045226eb244024b8420.tar.xz kernel-qcow2-linux-486aff5e04823bb1e60c4045226eb244024b8420.zip | |
xfs: perform dax_device lookup at mount
The ->iomap_begin() operation is a hot path, so cache the
fs_dax_get_by_host() result at mount time to avoid the incurring the
hash lookup overhead on a per-i/o basis.
Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'fs/xfs/xfs_buf.c')
| -rw-r--r-- | fs/xfs/xfs_buf.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index 72f038492ba8..6deb86c845d1 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -1802,7 +1802,8 @@ xfs_setsize_buftarg_early( xfs_buftarg_t * xfs_alloc_buftarg( struct xfs_mount *mp, - struct block_device *bdev) + struct block_device *bdev, + struct dax_device *dax_dev) { xfs_buftarg_t *btp; @@ -1811,6 +1812,7 @@ xfs_alloc_buftarg( btp->bt_mount = mp; btp->bt_dev = bdev->bd_dev; btp->bt_bdev = bdev; + btp->bt_daxdev = dax_dev; if (xfs_setsize_buftarg_early(btp, bdev)) goto error; |