Check and remove bitmap first when reshape to raid0

If reshape one raid device with bitmap to raid0, the reshape progress will
start. But it'll fail and lose some components. So it should remove bitmap
first.

Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>

diff --git a/Grow.c b/Grow.c
index 6dfb9c9cf11a1f97d8507e38cbf7b9a7d1edd20f..89e4c3413190e238d16afa2417cb8811501ce93d 100755 (executable)
--- a/Grow.c
+++ b/Grow.c
@@ -1590,6 +1590,15 @@ int Grow_reshape(char *devname, int fd,
                pr_err("Cannot increase raid-disks on this array beyond %d\n", st->max_devs);
                return 1;
        }
+       if (s->level == 0 &&
+           (array.state & (1<<MD_SB_BITMAP_PRESENT)) &&
+           !(array.state & (1<<MD_SB_CLUSTERED))) {
+                array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
+                if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
+                        pr_err("failed to remove internal bitmap.\n");
+                        return 1;
+                }
+        }
 
        /* in the external case we need to check that the requested reshape is
         * supported, and perform an initial check that the container holds the