LU-11811 mdt: Add a proc entry to set MDT to readonly

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

diff --git a/lustre/mdt/mdt_lproc.c b/lustre/mdt/mdt_lproc.c
index b64b74a..3007c4d 100644 (file)
--- a/lustre/mdt/mdt_lproc.c
+++ b/lustre/mdt/mdt_lproc.c
@@ -975,6 +975,34 @@ mdt_migrate_hsm_allowed_seq_write(struct file *file, const char __user *buffer,
 }
 LPROC_SEQ_FOPS(mdt_migrate_hsm_allowed);
 
+static int mdt_readonly_seq_show(struct seq_file *m, void *data)
+{
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+
+       seq_printf(m, "%u\n", mdt->mdt_readonly);
+       return 0;
+}
+
+static ssize_t
+mdt_readonly_seq_write(struct file *file, const char __user *buffer,
+                              size_t count, loff_t *off)
+{
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       bool val;
+       int rc;
+
+       rc = kstrtobool_from_user(buffer, count, &val);
+       if (rc)
+               return rc;
+
+       mdt->mdt_readonly = val;
+       return count;
+}
+LPROC_SEQ_FOPS(mdt_readonly);
+
 LPROC_SEQ_FOPS_RO_TYPE(mdt, recovery_status);
 LPROC_SEQ_FOPS_RO_TYPE(mdt, num_exports);
 LPROC_SEQ_FOPS_RO_TYPE(mdt, target_instance);
@@ -1062,6 +1090,8 @@ static struct lprocfs_vars lprocfs_mdt_obd_vars[] = {
          .fops =       &mdt_dom_read_open_fops                 },
        { .name =       "migrate_hsm_allowed",
          .fops =       &mdt_migrate_hsm_allowed_fops           },
+       { .name =       "readonly",
+         .fops =       &mdt_readonly_fops                      },
        { NULL }
 };