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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>
This commit is contained in:
NeilBrown 2009-12-30 12:08:50 +11:00
parent cbd1998377
commit 0f9552b5dc
1 changed files with 1 additions and 1 deletions
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2
drivers/md/md.c
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@ -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);