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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_iomap.c
parent78f35473508118df5ea04b9515ac3f1aaec0a980 (diff)
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_iomap.c')
-rw-r--r--fs/xfs/xfs_iomap.c10
1 files changed, 1 insertions, 9 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 813394c62849..7c934e407332 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -69,6 +69,7 @@ xfs_bmbt_to_iomap(
iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
+ iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
}
xfs_extlen_t
@@ -976,7 +977,6 @@ xfs_file_iomap_begin(
int nimaps = 1, error = 0;
bool shared = false, trimmed = false;
unsigned lockmode;
- struct block_device *bdev;
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
@@ -1087,13 +1087,6 @@ xfs_file_iomap_begin(
xfs_bmbt_to_iomap(ip, iomap, &imap);
- /* optionally associate a dax device with the iomap bdev */
- bdev = iomap->bdev;
- if (blk_queue_dax(bdev->bd_queue))
- iomap->dax_dev = fs_dax_get_by_host(bdev->bd_disk->disk_name);
- else
- iomap->dax_dev = NULL;
-
if (shared)
iomap->flags |= IOMAP_F_SHARED;
return 0;
@@ -1171,7 +1164,6 @@ xfs_file_iomap_end(
unsigned flags,
struct iomap *iomap)
{
- fs_put_dax(iomap->dax_dev);
if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC)
return xfs_file_iomap_end_delalloc(XFS_I(inode), offset,
length, written, iomap);