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xfs: poll waiting for quotacheck

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Create a pwork destroy function that uses polling instead of
uninterruptible sleep to wait for work items to finish so that we can
touch the softlockup watchdog.  IOWs, gross hack.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
2019-07-03 07:33:27 -07:00
parent 40786717c8
commit 3e5a428b26
5 changed files with 28 additions and 2 deletions
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19
fs/xfs/xfs_pwork.c
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@@ -13,6 +13,7 @@
#include "xfs_trace.h"
#include "xfs_sysctl.h"
#include "xfs_pwork.h"
#include <linux/nmi.h>
/*
* Parallel Work Queue
@@ -46,6 +47,8 @@ xfs_pwork_work(
error = pctl->work_fn(pctl->mp, pwork);
if (error && !pctl->error)
pctl->error = error;
if (atomic_dec_and_test(&pctl->nr_work))
wake_up(&pctl->poll_wait);
}
/*
@@ -74,6 +77,8 @@ xfs_pwork_init(
pctl->work_fn = work_fn;
pctl->error = 0;
pctl->mp = mp;
atomic_set(&pctl->nr_work, 0);
init_waitqueue_head(&pctl->poll_wait);
return 0;
}
@@ -86,6 +91,7 @@ xfs_pwork_queue(
{
INIT_WORK(&pwork->work, xfs_pwork_work);
pwork->pctl = pctl;
atomic_inc(&pctl->nr_work);
queue_work(pctl->wq, &pwork->work);
}
@@ -99,6 +105,19 @@ xfs_pwork_destroy(
return pctl->error;
}
/*
* Wait for the work to finish by polling completion status and touch the soft
* lockup watchdog. This is for callers such as mount which hold locks.
*/
void
xfs_pwork_poll(
struct xfs_pwork_ctl *pctl)
{
while (wait_event_timeout(pctl->poll_wait,
atomic_read(&pctl->nr_work) == 0, HZ) == 0)
touch_softlockup_watchdog();
}
/*
* Return the amount of parallelism that the data device can handle, or 0 for
* no limit.