UBIFS_SB_LNUM
sleb = ubifs_scan(c, UBIFS_SB_LNUM, UBIFS_SB_NODE_SZ, c->sbuf, 0);
if (lnum == UBIFS_SB_LNUM) {
UBIFS_SB_LNUM, 0);
return ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len);
#define UBIFS_MST_LNUM (UBIFS_SB_LNUM + UBIFS_SB_LEBS)