27 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat12_ent_blocknr()  local
29 	WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);  in fat12_ent_blocknr()
31 	*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);  in fat12_ent_blocknr()
37 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_blocknr()  local
38 	int bytes = (entry << sbi->fatent_shift);  in fat_ent_blocknr()
39 	WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);  in fat_ent_blocknr()
41 	*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);  in fat_ent_blocknr()
276 static inline void lock_fat(struct msdos_sb_info *sbi)  in lock_fat()  argument
278 	mutex_lock(&sbi->fat_lock);  in lock_fat()
281 static inline void unlock_fat(struct msdos_sb_info *sbi)  in unlock_fat()  argument
283 	mutex_unlock(&sbi->fat_lock);  in unlock_fat()
288 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_access_init()  local
290 	mutex_init(&sbi->fat_lock);  in fat_ent_access_init()
292 	switch (sbi->fat_bits) {  in fat_ent_access_init()
294 		sbi->fatent_shift = 2;  in fat_ent_access_init()
295 		sbi->fatent_ops = &fat32_ops;  in fat_ent_access_init()
298 		sbi->fatent_shift = 1;  in fat_ent_access_init()
299 		sbi->fatent_ops = &fat16_ops;  in fat_ent_access_init()
302 		sbi->fatent_shift = -1;  in fat_ent_access_init()
303 		sbi->fatent_ops = &fat12_ops;  in fat_ent_access_init()
312 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_update_ptr()  local
313 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_ent_update_ptr()
319 	if (sbi->fat_bits == 12) {  in fat_ent_update_ptr()
341 	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);  in fat_ent_read()  local
342 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_ent_read()
346 	if (entry < FAT_START_ENT || sbi->max_cluster <= entry) {  in fat_ent_read()
368 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_mirror_bhs()  local
373 	for (copy = 1; copy < sbi->fats; copy++) {  in fat_mirror_bhs()
374 		sector_t backup_fat = sbi->fat_length * copy;  in fat_mirror_bhs()
412 static inline int fat_ent_next(struct msdos_sb_info *sbi,  in fat_ent_next()  argument
415 	if (sbi->fatent_ops->ent_next(fatent)) {  in fat_ent_next()
416 		if (fatent->entry < sbi->max_cluster)  in fat_ent_next()
455 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_alloc_clusters()  local
456 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_alloc_clusters()
463 	lock_fat(sbi);  in fat_alloc_clusters()
464 	if (sbi->free_clusters != -1 && sbi->free_clus_valid &&  in fat_alloc_clusters()
465 	    sbi->free_clusters < nr_cluster) {  in fat_alloc_clusters()
466 		unlock_fat(sbi);  in fat_alloc_clusters()
474 	fatent_set_entry(&fatent, sbi->prev_free + 1);  in fat_alloc_clusters()
475 	while (count < sbi->max_cluster) {  in fat_alloc_clusters()
476 		if (fatent.entry >= sbi->max_cluster)  in fat_alloc_clusters()
495 				sbi->prev_free = entry;  in fat_alloc_clusters()
496 				if (sbi->free_clusters != -1)  in fat_alloc_clusters()
497 					sbi->free_clusters--;  in fat_alloc_clusters()
512 			if (count == sbi->max_cluster)  in fat_alloc_clusters()
514 		} while (fat_ent_next(sbi, &fatent));  in fat_alloc_clusters()
518 	sbi->free_clusters = 0;  in fat_alloc_clusters()
519 	sbi->free_clus_valid = 1;  in fat_alloc_clusters()
524 	unlock_fat(sbi);  in fat_alloc_clusters()
544 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_free_clusters()  local
545 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_free_clusters()
553 	lock_fat(sbi);  in fat_free_clusters()
573 			sb_issue_discard(sb, fat_clus_to_blknr(sbi, first_cl),  in fat_free_clusters()
574 					 nr_clus * sbi->sec_per_clus);  in fat_free_clusters()
579 		if (sbi->free_clusters != -1) {  in fat_free_clusters()
580 			sbi->free_clusters++;  in fat_free_clusters()
610 	unlock_fat(sbi);  in fat_free_clusters()
635 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_count_free_clusters()  local
636 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_count_free_clusters()
641 	lock_fat(sbi);  in fat_count_free_clusters()
642 	if (sbi->free_clusters != -1 && sbi->free_clus_valid)  in fat_count_free_clusters()
652 	while (fatent.entry < sbi->max_cluster) {  in fat_count_free_clusters()
655 			unsigned long rest = sbi->fat_length - cur_block;  in fat_count_free_clusters()
667 		} while (fat_ent_next(sbi, &fatent));  in fat_count_free_clusters()
669 	sbi->free_clusters = free;  in fat_count_free_clusters()
670 	sbi->free_clus_valid = 1;  in fat_count_free_clusters()
674 	unlock_fat(sbi);  in fat_count_free_clusters()