LU-12025 osp: allow OS_STATE_* flags from OSTs

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

diff --git a/lustre/ofd/lproc_ofd.c b/lustre/ofd/lproc_ofd.c
index abc67a8..71ee75a 100644 (file)
--- a/lustre/ofd/lproc_ofd.c
+++ b/lustre/ofd/lproc_ofd.c
@@ -191,11 +191,7 @@ LPROC_SEQ_FOPS_RO(ofd_last_id);
  * this OST are slowed down.  It also reduces the contention on the OST
  * RAID device, allowing it to rebuild more quickly.
  *
- * \param[in] m                seq_file handle
- * \param[in] data     unused for single entry
- *
- * \retval             0 on success
- * \retval             negative value on error
+ * \retval             count of bytes written
  */
 static ssize_t degraded_show(struct kobject *kobj, struct attribute *attr,
                             char *buf)
@@ -214,10 +210,6 @@ static ssize_t degraded_show(struct kobject *kobj, struct attribute *attr,
  * the underlying RAID storage, so that they can mark an OST
  * as having degraded performance.
  *
- * \param[in] file     proc file
- * \param[in] buffer   string which represents mode
- *                     1: set degraded mode
- *                     0: unset degraded mode
  * \param[in] count    \a buffer length
  * \param[in] off      unused for single entry
  *
@@ -245,6 +237,57 @@ static ssize_t degraded_store(struct kobject *kobj, struct attribute *attr,
 LUSTRE_RW_ATTR(degraded);
 
 /**
+ * Show if the OFD is in no precreate mode.
+ *
+ * This means OFD has been adminstratively disabled at the OST to prevent
+ * the MDS from creating any new files on the OST, though existing files
+ * can still be read, written, and unlinked.
+ *
+ * \retval             number of bytes written
+ */
+static ssize_t no_precreate_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, "%u\n", ofd->ofd_no_precreate);
+}
+
+/**
+ * Set OFD to no precreate mode.
+ *
+ * This is used to interface to userspace administrative tools to
+ * disable new object creation on the OST.
+ *
+ * \param[in] count    \a buffer length
+ *
+ * \retval             \a count on success
+ * \retval             negative number on error
+ */
+static ssize_t no_precreate_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);
+       bool val;
+       int rc;
+
+       rc = kstrtobool(buffer, &val);
+       if (rc)
+               return rc;
+
+       spin_lock(&ofd->ofd_flags_lock);
+       ofd->ofd_no_precreate = val;
+       spin_unlock(&ofd->ofd_flags_lock);
+
+       return count;
+}
+LUSTRE_RW_ATTR(no_precreate);
+
+/**
  * Show OFD filesystem type.
  *
  * \param[in] m                seq_file handle
@@ -847,6 +890,7 @@ static struct attribute *ofd_attrs[] = {
        &lustre_attr_precreate_batch.attr,
        &lustre_attr_degraded.attr,
        &lustre_attr_fstype.attr,
+       &lustre_attr_no_precreate.attr,
        &lustre_attr_sync_journal.attr,
        &lustre_attr_soft_sync_limit.attr,
        &lustre_attr_lfsck_speed_limit.attr,