imsm: Warn user about reboot risk

[thirdparty/mdadm.git] / super-intel.c

diff --git a/super-intel.c b/super-intel.c
index 62ccd150db6e7e316e4d8d01ee5553ad7eb366cb..010226db9abbffb5cd0682e929cef78aa0e621cc 100644 (file)
--- a/super-intel.c
+++ b/super-intel.c
@@ -7251,6 +7251,30 @@ int imsm_takeover(struct supertype *st, struct geo_params *geo)
        return 0;
 }
 
+static int warn_user_about_risk(void)
+{
+       int rv = 0;
+
+       fprintf(stderr,
+               "\nThis is an experimental feature. Data on the RAID volume(s) "
+               "can be lost!!!\n\n"
+               "To continue command execution please make sure that\n"
+               "the grow process will not be interrupted. Use safe power\n"
+               "supply to avoid unexpected system reboot. Make sure that\n"
+               "reshaped container is not assembled automatically during\n"
+               "system boot.\n"
+               "If reshape is interrupted, assemble array manually\n"
+               "using e.g. '-Ac' option and up to date mdadm.conf file.\n"
+               "Assembly in scan mode is not possible in such case.\n"
+               "Growing container with boot array is not possible.\n"
+               "If boot array reshape is interrupted, whole file system\n"
+               "can be lost.\n\n");
+       rv = ask("Do you want to continue? ");
+       fprintf(stderr, "\n");
+
+       return rv;
+}
+
 static int imsm_reshape_super(struct supertype *st, long long size, int level,
                              int layout, int chunksize, int raid_disks,
                              int delta_disks, char *backup, char *dev,
@@ -7283,6 +7307,14 @@ static int imsm_reshape_super(struct supertype *st, long long size, int level,
                /* On container level we can only increase number of devices. */
                dprintf("imsm: info: Container operation\n");
                int old_raid_disks = 0;
+
+               /* this warning will be removed when imsm checkpointing
+                * will be implemented, and restoring from check-point
+                * operation will be transparent for reboot process
+                */
+               if (warn_user_about_risk() == 0)
+                       return ret_val;
+
                if (imsm_reshape_is_allowed_on_container(
                            st, &geo, &old_raid_disks)) {
                        struct imsm_update_reshape *u = NULL;