Function free_buffer_head

Ext4Fsd/linux.c:344–366

}

void
free_buffer_head(struct buffer_head * bh)
{
    if (bh) {
        if (bh->b_mdl) {

            DEBUG(DL_BH, ("bh=%p mdl=%p (Flags:%xh VA:%p) released.\n", bh, bh->b_mdl,
                          bh->b_mdl->MdlFlags, bh->b_mdl->MappedSystemVa));
            if (IsFlagOn(bh->b_mdl->MdlFlags, MDL_MAPPED_TO_SYSTEM_VA)) {
                MmUnmapLockedPages(bh->b_mdl->MappedSystemVa, bh->b_mdl);
            }
            Ext2DestroyMdl(bh->b_mdl);
        }
        if (bh->b_bcb) {
            CcUnpinDataForThread(bh->b_bcb, (ERESOURCE_THREAD)bh | 0x3);
        }

        DEBUG(DL_BH, ("bh=%p freed.\n", bh));
        DEC_MEM_COUNT(PS_BUFF_HEAD, bh, sizeof(struct buffer_head));
        kmem_cache_free(g_jbh.bh_cache, bh);
        atomic_dec(&g_jbh.bh_count);
    }
}

//
// Red-black tree insert routine.