diff options
Diffstat (limited to 'fs/xfs/xfs_trans_ail.c')
| -rw-r--r-- | fs/xfs/xfs_trans_ail.c | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c index 9c514483e59..6011ee66133 100644 --- a/fs/xfs/xfs_trans_ail.c +++ b/fs/xfs/xfs_trans_ail.c @@ -383,6 +383,12 @@ xfsaild_push( } spin_lock(&ailp->xa_lock); + + /* barrier matches the xa_target update in xfs_ail_push() */ + smp_rmb(); + target = ailp->xa_target; + ailp->xa_target_prev = target; + lip = xfs_trans_ail_cursor_first(ailp, &cur, ailp->xa_last_pushed_lsn); if (!lip) { /* @@ -397,7 +403,6 @@ xfsaild_push( XFS_STATS_INC(xs_push_ail); lsn = lip->li_lsn; - target = ailp->xa_target; while ((XFS_LSN_CMP(lip->li_lsn, target) <= 0)) { int lock_result; @@ -527,8 +532,32 @@ xfsaild( __set_current_state(TASK_KILLABLE); else __set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(tout ? - msecs_to_jiffies(tout) : MAX_SCHEDULE_TIMEOUT); + + spin_lock(&ailp->xa_lock); + + /* + * Idle if the AIL is empty and we are not racing with a target + * update. We check the AIL after we set the task to a sleep + * state to guarantee that we either catch an xa_target update + * or that a wake_up resets the state to TASK_RUNNING. + * Otherwise, we run the risk of sleeping indefinitely. + * + * The barrier matches the xa_target update in xfs_ail_push(). + */ + smp_rmb(); + if (!xfs_ail_min(ailp) && + ailp->xa_target == ailp->xa_target_prev) { + spin_unlock(&ailp->xa_lock); + schedule(); + tout = 0; + continue; + } + spin_unlock(&ailp->xa_lock); + + if (tout) + schedule_timeout(msecs_to_jiffies(tout)); + + __set_current_state(TASK_RUNNING); try_to_freeze(); |