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[PATCH] knfsd: nfsd4: create separate laundromat workqueue

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We're running the laundromat work on the default kevent worker thread.  But
the laundromat takes the nfsv4 state semaphore, which is used for way too much
stuff, and the potential for deadlocks is high.  Better to have this on a
separate workqueue.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-06-23 22:03:19 -07:00 committed by Linus Torvalds
parent dfc8356570
commit 58da282b73
1 changed files with 6 additions and 3 deletions
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9
fs/nfsd/nfs4state.c
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@ -1844,6 +1844,7 @@ out:
return status;
}
static struct workqueue_struct *laundry_wq;
static struct work_struct laundromat_work;
static void laundromat_main(void *);
static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
@ -1951,7 +1952,7 @@ laundromat_main(void *not_used)
t = nfs4_laundromat();
dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
schedule_delayed_work(&laundromat_work, t*HZ);
queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
}
/* search ownerid_hashtbl[] and close_lru for stateid owner
@ -3211,7 +3212,8 @@ __nfs4_state_init(void)
printk("NFSD: starting %ld-second grace period\n", grace_time);
grace_end = boot_time + grace_time;
INIT_WORK(&laundromat_work,laundromat_main, NULL);
schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
laundry_wq = create_singlethread_workqueue("nfsd4");
queue_delayed_work(laundry_wq, &laundromat_work, NFSD_LEASE_TIME*HZ);
}
int
@ -3287,7 +3289,8 @@ __nfs4_state_shutdown(void)
}
cancel_delayed_work(&laundromat_work);
flush_scheduled_work();
flush_workqueue(laundry_wq);
destroy_workqueue(laundry_wq);
nfs4_init = 0;
}