xfs: debug mode forced buffered write failure
Add a DEBUG mode-only sysfs knob to enable forced buffered write
failure. An additional side effect of this mode is brute force killing
of delayed allocation blocks in the range of the write. The latter is
the prime motiviation behind this patch, as userspace test
infrastructure requires a reliable mechanism to create and split
delalloc extents without causing extent conversion.
Certain fallocate operations (i.e., zero range) were used for this in
the past, but the implementations have changed such that delalloc
extents are flushed and converted to real blocks, rendering the test
useless.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 641d625..6ced4f1 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -18,10 +18,13 @@
#include "xfs.h"
#include "xfs_sysfs.h"
+#include "xfs_format.h"
#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
#include "xfs_log.h"
#include "xfs_log_priv.h"
#include "xfs_stats.h"
+#include "xfs_mount.h"
struct xfs_sysfs_attr {
struct attribute attr;
@@ -45,16 +48,6 @@
#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
-/*
- * xfs_mount kobject. This currently has no attributes and thus no need for show
- * and store helpers. The mp kobject serves as the per-mount parent object that
- * is identified by the fsname under sysfs.
- */
-
-struct kobj_type xfs_mp_ktype = {
- .release = xfs_sysfs_release,
-};
-
STATIC ssize_t
xfs_sysfs_object_show(
struct kobject *kobject,
@@ -83,6 +76,71 @@
.store = xfs_sysfs_object_store,
};
+/*
+ * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
+ * that is identified by the fsname under sysfs.
+ */
+
+static inline struct xfs_mount *
+to_mp(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+
+ return container_of(kobj, struct xfs_mount, m_kobj);
+}
+
+#ifdef DEBUG
+
+STATIC ssize_t
+fail_writes_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_mount *mp = to_mp(kobject);
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val == 1)
+ mp->m_fail_writes = true;
+ else if (val == 0)
+ mp->m_fail_writes = false;
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+STATIC ssize_t
+fail_writes_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ struct xfs_mount *mp = to_mp(kobject);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_writes ? 1 : 0);
+}
+XFS_SYSFS_ATTR_RW(fail_writes);
+
+#endif /* DEBUG */
+
+static struct attribute *xfs_mp_attrs[] = {
+#ifdef DEBUG
+ ATTR_LIST(fail_writes),
+#endif
+ NULL,
+};
+
+struct kobj_type xfs_mp_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_mp_attrs,
+};
+
#ifdef DEBUG
/* debug */