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afs: Calculate lock extend timer from set/extend reply reception

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Record the timestamp on the first reply DATA packet received in response to
a set- or extend-lock operation, then use this to calculate the time
remaining till the lock expires rather than using whatever time the
requesting process wakes up and finishes processing the operation as a
base.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2019-04-25 14:26:50 +01:00
parent 0b9bf3812a
commit a690f60a2b
4 changed files with 38 additions and 2 deletions
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30
fs/afs/flock.c
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@@ -40,8 +40,34 @@ void afs_lock_may_be_available(struct afs_vnode *vnode)
*/
static void afs_schedule_lock_extension(struct afs_vnode *vnode)
{
queue_delayed_work(afs_lock_manager, &vnode->lock_work,
AFS_LOCKWAIT * HZ / 2);
ktime_t expires_at, now, duration;
u64 duration_j;
expires_at = ktime_add_ms(vnode->locked_at, AFS_LOCKWAIT * 1000 / 2);
now = ktime_get_real();
duration = ktime_sub(expires_at, now);
if (duration <= 0)
duration_j = 0;
else
duration_j = nsecs_to_jiffies(ktime_to_ns(duration));
queue_delayed_work(afs_lock_manager, &vnode->lock_work, duration_j);
}
/*
* In the case of successful completion of a lock operation, record the time
* the reply appeared and start the lock extension timer.
*/
void afs_lock_op_done(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply[0];
if (call->error == 0) {
spin_lock(&vnode->lock);
vnode->locked_at = call->reply_time;
afs_schedule_lock_extension(vnode);
spin_unlock(&vnode->lock);
}
}
/*