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md: be more relaxed about stopping an array which isn't started. 

In general we don't allow an array to be stopped if it is in use.
However if the array hasn't really been started yet, then any
apparent use is an anomily, probably due to 'udev' or similar
having a look to see what is there.

This means that if something goes wrong while assembling an array
it cannot reliably be un-assembled - STOP_ARRAY could fail.
There is no value here, so change do_md_stop() to succeed
despite concurrent opens if the array has not yet been
activated.  i.e. if ->pers is NULL.

Reported-by: "Baldysiak, Pawel" <pawel.baldysiak@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2014-09-09 14:00:15 +10:00
parent c95e6385e8
commit 9ba3b7f5d0
1 changed files with 3 additions and 3 deletions
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6
drivers/md/md.c
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@ -5307,7 +5307,7 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
mddev_lock_nointr(mddev);
mutex_lock(&mddev->open_mutex);
if (atomic_read(&mddev->openers) > !!bdev ||
if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
mddev->sync_thread ||
(bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
printk("md: %s still in use.\n",mdname(mddev));
@ -5362,7 +5362,7 @@ static int do_md_stop(struct mddev * mddev, int mode,
mddev_lock_nointr(mddev);
mutex_lock(&mddev->open_mutex);
if (atomic_read(&mddev->openers) > !!bdev ||
if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
mddev->sysfs_active ||
mddev->sync_thread ||
(bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
@ -6454,7 +6454,7 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
* and writes
*/
mutex_lock(&mddev->open_mutex);
if (atomic_read(&mddev->openers) > 1) {
if (mddev->pers && atomic_read(&mddev->openers) > 1) {
mutex_unlock(&mddev->open_mutex);
err = -EBUSY;
goto abort;