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bcache: Fix a sysfs splat on shutdown

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If we stopped a bcache device when we were already detaching (or
something like that), bcache_device_unlink() would try to remove a
symlink from sysfs that was already gone because the bcache dev kobject
had already been removed from sysfs.

So keep track of whether we've removed stuff from sysfs.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
This commit is contained in:
Kent Overstreet 2013-07-10 21:25:02 -07:00
parent 54d12f2b4f
commit c9502ea442
2 changed files with 11 additions and 1 deletions
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1
drivers/md/bcache/bcache.h
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@ -434,6 +434,7 @@ struct bcache_device {
/* If nonzero, we're detaching/unregistering from cache set */
atomic_t detaching;
int flush_done;
uint64_t nr_stripes;
unsigned stripe_size_bits;

11
drivers/md/bcache/super.c
View File

@ -706,7 +706,8 @@ static void bcache_device_detach(struct bcache_device *d)
atomic_set(&d->detaching, 0);
}
bcache_device_unlink(d);
if (!d->flush_done)
bcache_device_unlink(d);
d->c->devices[d->id] = NULL;
closure_put(&d->c->caching);
@ -1055,6 +1056,14 @@ static void cached_dev_flush(struct closure *cl)
struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl);
struct bcache_device *d = &dc->disk;
mutex_lock(&bch_register_lock);
d->flush_done = 1;
if (d->c)
bcache_device_unlink(d);
mutex_unlock(&bch_register_lock);
bch_cache_accounting_destroy(&dc->accounting);
kobject_del(&d->kobj);