diff options
Diffstat (limited to 'drivers/md/dm-ioctl.c')
| -rw-r--r-- | drivers/md/dm-ioctl.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 3fd8f0e169e..4702f380cb4 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1189,6 +1189,21 @@ static int table_load(struct dm_ioctl *param, size_t param_size) goto out; } + /* Protect md->type against concurrent table loads. */ + dm_lock_md_type(md); + if (dm_get_md_type(md) == DM_TYPE_NONE) + /* Initial table load: acquire type of table. */ + dm_set_md_type(md, dm_table_get_type(t)); + else if (dm_get_md_type(md) != dm_table_get_type(t)) { + DMWARN("can't change device type after initial table load."); + dm_table_destroy(t); + dm_unlock_md_type(md); + r = -EINVAL; + goto out; + } + dm_unlock_md_type(md); + + /* stage inactive table */ down_write(&_hash_lock); hc = dm_get_mdptr(md); if (!hc || hc->md != md) { |