xfs: make errortag a per-mountpoint structure
Remove the xfs_etest structure in favor of a per-mountpoint structure.
This will give us the flexibility to set as many error injection points
as we want, and later enable us to set up sysfs knobs to set the trigger
frequency as we wish. This comes at a cost of higher memory use, but
unti we hit 1024 injection points (we're at 29) or a lot of mounts this
shouldn't be a huge issue.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 305d953..e002ac5 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -199,6 +199,13 @@
bool m_fail_unmount;
#ifdef DEBUG
/*
+ * Frequency with which errors are injected. Replaces xfs_etest; the
+ * value stored in here is the inverse of the frequency with which the
+ * error triggers. 1 = always, 2 = half the time, etc.
+ */
+ unsigned int *m_errortag;
+
+ /*
* DEBUG mode instrumentation to test and/or trigger delayed allocation
* block killing in the event of failed writes. When enabled, all
* buffered writes are silenty dropped and handled as if they failed.