@@ -1157,6 +1157,7 @@ static const struct vm_operations_struct xfs_file_vm_direct_ops = {
.open = generic_map_direct_open,
.close = generic_map_direct_close,
+ .lease_direct = generic_map_direct_lease,
};
static const struct vm_operations_struct xfs_file_vm_ops = {
@@ -1209,8 +1210,8 @@ xfs_file_mmap_direct(
vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
/*
- * generic_map_direct_{open,close} expect ->vm_private_data is
- * set to the result of map_direct_register
+ * generic_map_direct_{open,close,lease} expect
+ * ->vm_private_data is set to the result of map_direct_register
*/
vma->vm_private_data = mds;
return 0;
A 'lease_direct' lease requires that the vma have a valid MAP_DIRECT mapping established. For xfs we use the generic_map_direct_lease() handler for ->lease_direct(). It establishes a new lease and then checks if the MAP_DIRECT mapping has been broken. We want to be sure that the process will receive notification that the MAP_DIRECT mapping is being torn down so it knows why other code paths are throwing failures. For example in the RDMA/ibverbs case we want ibv_reg_mr() to fail if the MAP_DIRECT mapping is invalid or in the process of being invalidated. Cc: Jan Kara <jack@suse.cz> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: "Darrick J. Wong" <darrick.wong@oracle.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Jeff Layton <jlayton@poochiereds.net> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- fs/xfs/xfs_file.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html