diff options
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 259a1b8e2d9b..042114fbd200 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2507,6 +2507,19 @@ void dm_get(struct mapped_device *md) BUG_ON(test_bit(DMF_FREEING, &md->flags)); } +int dm_hold(struct mapped_device *md) +{ + spin_lock(&_minor_lock); + if (test_bit(DMF_FREEING, &md->flags)) { + spin_unlock(&_minor_lock); + return -EBUSY; + } + dm_get(md); + spin_unlock(&_minor_lock); + return 0; +} +EXPORT_SYMBOL_GPL(dm_hold); + const char *dm_device_name(struct mapped_device *md) { return md->name; |