md: fix small irregularity with start_ro module parameter

The start_ro modules parameter can be used to force arrays to be
started in 'auto-readonly' in which they are read-only until the first
write.  This ensures that no resync/recovery happens until something
else writes to the device.  This is important for resume-from-disk
off an md array.

However if an array is started 'readonly' (by writing 'readonly' to
the 'array_state' sysfs attribute) we want it to be really 'readonly',
not 'auto-readonly'.

So strengthen the condition to only set auto-readonly if the
array is not already read-only.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7862231..d2aff72 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4357,7 +4357,7 @@ static int do_md_run(mddev_t * mddev)
        mddev->barriers_work = 1;
        mddev->ok_start_degraded = start_dirty_degraded;
 
-       if (start_readonly)
+       if (start_readonly && mddev->ro == 0)
                mddev->ro = 2; /* read-only, but switch on first write */
 
        err = mddev->pers->run(mddev);