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md: fix up switching md arrays between read-only and read-write

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When setting an array to 'readonly' or to 'active' via sysfs, we must make the
appropriate set_disk_ro call too.

Also when switching to "read_auto" (which is like readonly, but blocks on the
first write so that metadata can be marked 'dirty') we need to be more careful
about what state we are changing from.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2008-04-30 00:52:30 -07:00 committed by Linus Torvalds
parent 31a59e3425
commit 648b629ed4
1 changed files with 10 additions and 4 deletions
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14
drivers/md/md.c
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@ -2594,15 +2594,20 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
err = do_md_stop(mddev, 1);
else {
mddev->ro = 1;
set_disk_ro(mddev->gendisk, 1);
err = do_md_run(mddev);
}
break;
case read_auto:
/* stopping an active array */
if (mddev->pers) {
err = do_md_stop(mddev, 1);
if (err == 0)
mddev->ro = 2; /* FIXME mark devices writable */
if (mddev->ro != 1)
err = do_md_stop(mddev, 1);
else
err = restart_array(mddev);
if (err == 0) {
mddev->ro = 2;
set_disk_ro(mddev->gendisk, 0);
}
} else {
mddev->ro = 2;
err = do_md_run(mddev);
@ -2640,6 +2645,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
err = 0;
} else {
mddev->ro = 0;
set_disk_ro(mddev->gendisk, 0);
err = do_md_run(mddev);
}
break;