LU-13383 ofd: lazy atime update

[fs/lustre-release.git] / lustre / ofd / lproc_ofd.c

diff --git a/lustre/ofd/lproc_ofd.c b/lustre/ofd/lproc_ofd.c
index 9d78009..e7ed6a8 100644 (file)
--- a/lustre/ofd/lproc_ofd.c
+++ b/lustre/ofd/lproc_ofd.c
@@ -147,6 +147,57 @@ static ssize_t precreate_batch_store(struct kobject *kobj,
 LUSTRE_RW_ATTR(precreate_batch);
 
 /**
+ * Show number of seconds to delay atime
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ *
+ * \retval             0 on success
+ * \retval             negative value on error
+ */
+static ssize_t atime_diff_show(struct kobject *kobj, struct attribute *attr,
+                              char *buf)
+{
+       struct obd_device *obd = container_of(kobj, struct obd_device,
+                                             obd_kset.kobj);
+       struct ofd_device *ofd = ofd_dev(obd->obd_lu_dev);
+
+       return snprintf(buf, PAGE_SIZE, "%lld\n", ofd->ofd_atime_diff);
+}
+
+/**
+ * Change number of seconds to delay atime
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents maximum number
+ * \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 atime_diff_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 ofd_device *ofd = ofd_dev(obd->obd_lu_dev);
+       unsigned int val;
+       int rc;
+
+       rc = kstrtouint(buffer, 0, &val);
+       if (rc)
+               return rc;
+
+       if (val > 86400)
+               return -EINVAL;
+
+       ofd->ofd_atime_diff = val;
+       return count;
+}
+LUSTRE_RW_ATTR(atime_diff);
+
+/**
  * Show the last used ID for each FID sequence used by OFD.
  *
  * \param[in] m                seq_file handle
@@ -920,6 +971,7 @@ static struct attribute *ofd_attrs[] = {
        &lustre_attr_seqs_allocated.attr,
        &lustre_attr_grant_precreate.attr,
        &lustre_attr_precreate_batch.attr,
+       &lustre_attr_atime_diff.attr,
        &lustre_attr_degraded.attr,
        &lustre_attr_fstype.attr,
        &lustre_attr_no_precreate.attr,