[RFC v2 PATCH 1/3] xfs: set t_task at wait time instead of alloc time

[Brian Foster <bfoster@redhat.com>]

The xlog_ticket structure contains a task reference to support task
scheduling associated with log reservation acquisition. This
reference is assigned at ticket allocation time, but otherwise there
is no reason log space cannot be reserved for a ticket from a
context different from the allocating context. Move the task
assignment to the log reservation blocking code where it is used.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/xfs_log.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 6a147c63a8a6..0c0c035c5be0 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -262,6 +262,7 @@ xlog_grant_head_wait(
 	int			need_bytes) __releases(&head->lock)
 					    __acquires(&head->lock)
 {
+	tic->t_task = current;
 	list_add_tail(&tic->t_queue, &head->waiters);
 
 	do {
@@ -3599,7 +3600,6 @@ xlog_ticket_alloc(
 	unit_res = xfs_log_calc_unit_res(log->l_mp, unit_bytes);
 
 	atomic_set(&tic->t_ref, 1);
-	tic->t_task		= current;
 	INIT_LIST_HEAD(&tic->t_queue);
 	tic->t_unit_res		= unit_res;
 	tic->t_curr_res		= unit_res;
-- 
2.20.1