1 files changed, 68 insertions, 10 deletions

diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 641d625eb334..6ced4f143494 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 @@ to_attr(struct attribute *attr)
 
 #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 @@ static const struct sysfs_ops xfs_sysfs_ops = {
         .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 */