Lines Matching refs:dmap
71 * we use a second set of bitmaps, the dmap (dirty bitmap), which includes two
87 * and dmap.
89 * During a metadata commit we scan dmap->dirty_words and dmap->dirty_regions
93 * We use the helper dmap->dirty_words bitmap, which is smaller than the
107 * swap the currently used dmap with the unused one. This allows the metadata
127 struct dirty_map dmap[2];
479 static int __dirty_map_init(struct dirty_map *dmap, unsigned long nr_words,
482 dmap->changed = 0;
484 dmap->dirty_words = kvzalloc(bitmap_size(nr_words), GFP_KERNEL);
485 if (!dmap->dirty_words)
488 dmap->dirty_regions = kvzalloc(bitmap_size(nr_regions), GFP_KERNEL);
489 if (!dmap->dirty_regions) {
490 kvfree(dmap->dirty_words);
497 static void __dirty_map_exit(struct dirty_map *dmap)
499 kvfree(dmap->dirty_words);
500 kvfree(dmap->dirty_regions);
505 if (__dirty_map_init(&cmd->dmap[0], cmd->nr_words, cmd->nr_regions)) {
510 if (__dirty_map_init(&cmd->dmap[1], cmd->nr_words, cmd->nr_regions)) {
512 __dirty_map_exit(&cmd->dmap[0]);
516 cmd->current_dmap = &cmd->dmap[0];
524 __dirty_map_exit(&cmd->dmap[0]);
525 __dirty_map_exit(&cmd->dmap[1]);
748 static int __flush_dmap(struct dm_clone_metadata *cmd, struct dirty_map *dmap)
755 word = find_next_bit(dmap->dirty_words, cmd->nr_words, word);
760 r = __update_metadata_word(cmd, dmap->dirty_regions, word);
765 __clear_bit(word, dmap->dirty_words);
776 dmap->changed = 0;
785 struct dirty_map *dmap, *next_dmap;
795 dmap = cmd->current_dmap;
798 next_dmap = (dmap == &cmd->dmap[0]) ? &cmd->dmap[1] : &cmd->dmap[0];
815 cmd->committing_dmap = dmap;
838 /* Clear committing dmap */
850 struct dirty_map *dmap;
868 dmap = cmd->current_dmap;
870 __set_bit(word, dmap->dirty_words);
871 __set_bit(region_nr, dmap->dirty_regions);
873 dmap->changed = 1;
885 struct dirty_map *dmap;
902 dmap = cmd->current_dmap;
906 __set_bit(word, dmap->dirty_words);
907 __set_bit(region_nr, dmap->dirty_regions);
909 dmap->changed = 1;
950 r = cmd->dmap[0].changed || cmd->dmap[1].changed;