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Commit 3e5a428b authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: poll waiting for quotacheck 



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: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
parent 40786717

fs/xfs/xfs_iwalk.c

+3 −0
Original line number Diff line number Diff line
@@ -588,6 +588,7 @@ xfs_iwalk_threaded( 
	xfs_ino_t		startino,

	xfs_iwalk_fn		iwalk_fn,

	unsigned int		inode_records,

	bool			polled,

	void			*data)

{

	struct xfs_pwork_ctl	pctl;
@@ -619,6 +620,8 @@ xfs_iwalk_threaded( 
		startino = XFS_AGINO_TO_INO(mp, agno + 1, 0);

	}



	if (polled)

		xfs_pwork_poll(&pctl);

	return xfs_pwork_destroy(&pctl);

}

fs/xfs/xfs_iwalk.h

+2 −1
Original line number Diff line number Diff line
@@ -16,7 +16,8 @@ typedef int (*xfs_iwalk_fn)(struct xfs_mount *mp, struct xfs_trans *tp, 
int xfs_iwalk(struct xfs_mount *mp, struct xfs_trans *tp, xfs_ino_t startino,

		xfs_iwalk_fn iwalk_fn, unsigned int inode_records, void *data);

int xfs_iwalk_threaded(struct xfs_mount *mp, xfs_ino_t startino,

		xfs_iwalk_fn iwalk_fn, unsigned int inode_records, void *data);

		xfs_iwalk_fn iwalk_fn, unsigned int inode_records, bool poll,

		void *data);



/* Walk all inode btree records in the filesystem starting from @startino. */

typedef int (*xfs_inobt_walk_fn)(struct xfs_mount *mp, struct xfs_trans *tp,

fs/xfs/xfs_pwork.c

+19 −0
Original line number Diff line number Diff line
@@ -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.

fs/xfs/xfs_pwork.h

+3 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ struct xfs_pwork_ctl { 
	struct workqueue_struct	*wq;

	struct xfs_mount	*mp;

	xfs_pwork_work_fn	work_fn;

	struct wait_queue_head	poll_wait;

	atomic_t		nr_work;

	int			error;

};
@@ -53,6 +55,7 @@ int xfs_pwork_init(struct xfs_mount *mp, struct xfs_pwork_ctl *pctl, 
		unsigned int nr_threads);

void xfs_pwork_queue(struct xfs_pwork_ctl *pctl, struct xfs_pwork *pwork);

int xfs_pwork_destroy(struct xfs_pwork_ctl *pctl);

void xfs_pwork_poll(struct xfs_pwork_ctl *pctl);

unsigned int xfs_pwork_guess_datadev_parallelism(struct xfs_mount *mp);



#endif /* __XFS_PWORK_H__ */

fs/xfs/xfs_qm.c

+1 −1
Original line number Diff line number Diff line
@@ -1300,7 +1300,7 @@ xfs_qm_quotacheck( 
		flags |= XFS_PQUOTA_CHKD;

	}



	error = xfs_iwalk_threaded(mp, 0, xfs_qm_dqusage_adjust, 0, NULL);

	error = xfs_iwalk_threaded(mp, 0, xfs_qm_dqusage_adjust, 0, true, NULL);

	if (error)

		goto error_return;