DEACTIVATE_LOCKED_SU(9) The Linux VFS DEACTIVATE_LOCKED_SU(9)
NAME deactivate_locked_super - drop an active reference to superblock
SYNOPSIS void deactivate_locked_super(struct super_block * s);
ARGUMENTS s superblock to deactivate
DESCRIPTION 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.
COPYRIGHT Kernel Hackers Manual 2.6. April 2016 DEACTIVATE_LOCKED_SU(9)