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scoutfs: add trans item tracking trace

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Add a trace event that records the changes to a reservation's dirty item
count.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2018-06-29 14:42:06 -07:00
committed by Zach Brown
parent 1b3645db8b
commit dd091e18a9
2 changed files with 47 additions and 0 deletions
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kmod/src/trans.c
+14
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@@ -392,6 +392,16 @@ bool scoutfs_trans_held(void)
return rsv && rsv->magic == SCOUTFS_RESERVATION_MAGIC;
}
/*
* Record a transaction holder's individual contribution to the dirty
* items in the current transaction. We're making sure that the
* reservation matches the possible item manipulations while they hold
* the reservation.
*
* It is possible and legitimate for an individual contribution to be
* negative if they delete dirty items. The item cache makes sure that
* the total dirty item count doesn't fall below zero.
*/
void scoutfs_trans_track_item(struct super_block *sb, signed items,
signed vals)
{
@@ -406,6 +416,10 @@ void scoutfs_trans_track_item(struct super_block *sb, signed items,
rsv->actual.items += items;
rsv->actual.vals += vals;
trace_scoutfs_trans_track_item(sb, items, vals, rsv->actual.items,
rsv->actual.vals, rsv->reserved.items,
rsv->reserved.vals);
WARN_ON_ONCE(rsv->actual.items > rsv->reserved.items);
WARN_ON_ONCE(rsv->actual.vals > rsv->reserved.vals);
}