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[plasmaroo@gentoo.org]: Patch backported from 2.4.22-pre9...
Because an md array may not exist yet when the device it opened, the ->active
count, which is incremented on opening if the array exists, is not 100% reliable.
This patch changes md to test inode->i_bdev->bd_openers rather than mddev->active
to test if an array is still in used before stopping it.
diff ./drivers/md/md.c~current~ ./drivers/md/md.c
--- ./drivers/md/md.c~current~ 2003-09-04 11:32:15.000000000 +1000
+++ ./drivers/md/md.c 2003-09-04 11:32:14.000000000 +1000
@@ -1805,10 +1805,12 @@ static int do_md_stop(mddev_t * mddev, i
int err = 0, resync_interrupted = 0;
kdev_t dev = mddev_to_kdev(mddev);
+#if 0 /* ->active is not currently reliable */
if (atomic_read(&mddev->active)>1) {
printk(STILL_IN_USE, mdidx(mddev));
OUT(-EBUSY);
}
+#endif
if (mddev->pers) {
/*
@@ -2742,12 +2744,17 @@ static int md_ioctl(struct inode *inode,
goto done_unlock;
case STOP_ARRAY:
- if (!(err = do_md_stop (mddev, 0)))
+ if (inode->i_bdev->bd_openers > 1)
+ err = -EBUSY;
+ else if (!(err = do_md_stop (mddev, 0)))
mddev = NULL;
goto done_unlock;
case STOP_ARRAY_RO:
- err = do_md_stop (mddev, 1);
+ if (inode->i_bdev->bd_openers > 1)
+ err = -EBUSY;
+ else
+ err = do_md_stop (mddev, 1);
goto done_unlock;
/*
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