LU-15593 mdt: Add option to disable use of SOM

[fs/lustre-release.git] / lustre / mdt / mdt_lproc.c

diff --git a/lustre/mdt/mdt_lproc.c b/lustre/mdt/mdt_lproc.c
index e3bfce8..78fb699 100644 (file)
--- a/lustre/mdt/mdt_lproc.c
+++ b/lustre/mdt/mdt_lproc.c
@@ -1046,6 +1046,58 @@ static ssize_t dom_read_open_store(struct kobject *kobj,
 }
 LUSTRE_RW_ATTR(dom_read_open);
 
+/**
+ * Show policy for using strict SOM information for real size (stat size).
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused
+ *
+ * \retval             0 on success
+ * \retval             negative value on error
+ */
+static ssize_t enable_strict_som_show(struct kobject *kobj,
+                                     struct attribute *attr, char *buf)
+{
+       struct obd_device *obd = container_of(kobj, struct obd_device,
+                                             obd_kset.kobj);
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+
+       return scnprintf(buf, PAGE_SIZE, "%u\n",
+                        !!mdt->mdt_opts.mo_enable_strict_som);
+}
+
+/**
+ * Modify policy for using strict SOM information for real size (stat size).
+ *
+ * If disabled, SOM is never used for stat.
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents policy
+ * \param[in] count    \a buffer length
+ * \param[in] off      unused for single entry
+ *
+ * \retval             \a count on success
+ * \retval             negative number on error
+ */
+static ssize_t enable_strict_som_store(struct kobject *kobj,
+                                      struct attribute *attr,
+                                      const char *buffer, size_t count)
+{
+       struct obd_device *obd = container_of(kobj, struct obd_device,
+                                             obd_kset.kobj);
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       bool val;
+       int rc;
+
+       rc = kstrtobool(buffer, &val);
+       if (rc)
+               return rc;
+
+       mdt->mdt_opts.mo_enable_strict_som = !!val;
+       return count;
+}
+LUSTRE_RW_ATTR(enable_strict_som);
+
 static ssize_t migrate_hsm_allowed_show(struct kobject *kobj,
                                        struct attribute *attr, char *buf)
 {
@@ -1413,6 +1465,7 @@ static struct attribute *mdt_attrs[] = {
        &lustre_attr_sync_count.attr,
        &lustre_attr_dom_lock.attr,
        &lustre_attr_dom_read_open.attr,
+       &lustre_attr_enable_strict_som.attr,
        &lustre_attr_migrate_hsm_allowed.attr,
        &lustre_attr_hsm_control.attr,
        &lustre_attr_job_cleanup_interval.attr,