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authorDan Williams <dan.j.williams@intel.com>2017-08-24 15:12:50 -0700
committerDan Williams <dan.j.williams@intel.com>2017-08-31 09:31:47 -0700
commit486aff5e04823bb1e60c4045226eb244024b8420 (patch)
treec0cc960b998086e92873d918f203a5e737e97db6 /fs/xfs/xfs_buf.c
parent78f35473508118df5ea04b9515ac3f1aaec0a980 (diff)
downloadlinux-486aff5e04823bb1e60c4045226eb244024b8420.tar.bz2
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.c4
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;