deactivate_locked_super — drop an active reference to superblock
void deactivate_locked_super ( | struct super_block * s); |
Equivalent of up_write(s->s_umount); deactivate_super(s);, except that
it does not unlock it until it's all over. As the result, it's safe to
use to dispose of new superblock on ->get_sb failure exits - nobody
will see the sucker until it's all over. Equivalent using up_write +
deactivate_super is safe for that purpose only if superblock is either
safe to use or has NULL ->s_root when we unlock.