24 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat12_ent_blocknr()  local
26 	WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);  in fat12_ent_blocknr()
28 	*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);  in fat12_ent_blocknr()
34 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_blocknr()  local
35 	int bytes = (entry << sbi->fatent_shift);  in fat_ent_blocknr()
36 	WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);  in fat_ent_blocknr()
38 	*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()
310 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in mark_fsinfo_dirty()  local
312 	if (sb->s_flags & MS_RDONLY || sbi->fat_bits != 32)  in mark_fsinfo_dirty()
315 	__mark_inode_dirty(sbi->fsinfo_inode, I_DIRTY_SYNC);  in mark_fsinfo_dirty()
322 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_update_ptr()  local
323 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_ent_update_ptr()
329 	if (sbi->fat_bits == 12) {  in fat_ent_update_ptr()
351 	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);  in fat_ent_read()  local
352 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_ent_read()
356 	if (entry < FAT_START_ENT || sbi->max_cluster <= entry) {  in fat_ent_read()
378 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_mirror_bhs()  local
383 	for (copy = 1; copy < sbi->fats; copy++) {  in fat_mirror_bhs()
384 		sector_t backup_fat = sbi->fat_length * copy;  in fat_mirror_bhs()
394 			mark_buffer_dirty_inode(c_bh, sbi->fat_inode);  in fat_mirror_bhs()
422 static inline int fat_ent_next(struct msdos_sb_info *sbi,  in fat_ent_next()  argument
425 	if (sbi->fatent_ops->ent_next(fatent)) {  in fat_ent_next()
426 		if (fatent->entry < sbi->max_cluster)  in fat_ent_next()
465 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_alloc_clusters()  local
466 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_alloc_clusters()
473 	lock_fat(sbi);  in fat_alloc_clusters()
474 	if (sbi->free_clusters != -1 && sbi->free_clus_valid &&  in fat_alloc_clusters()
475 	    sbi->free_clusters < nr_cluster) {  in fat_alloc_clusters()
476 		unlock_fat(sbi);  in fat_alloc_clusters()
484 	fatent_set_entry(&fatent, sbi->prev_free + 1);  in fat_alloc_clusters()
485 	while (count < sbi->max_cluster) {  in fat_alloc_clusters()
486 		if (fatent.entry >= sbi->max_cluster)  in fat_alloc_clusters()
505 				sbi->prev_free = entry;  in fat_alloc_clusters()
506 				if (sbi->free_clusters != -1)  in fat_alloc_clusters()
507 					sbi->free_clusters--;  in fat_alloc_clusters()
521 			if (count == sbi->max_cluster)  in fat_alloc_clusters()
523 		} while (fat_ent_next(sbi, &fatent));  in fat_alloc_clusters()
527 	sbi->free_clusters = 0;  in fat_alloc_clusters()
528 	sbi->free_clus_valid = 1;  in fat_alloc_clusters()
532 	unlock_fat(sbi);  in fat_alloc_clusters()
553 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_free_clusters()  local
554 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_free_clusters()
562 	lock_fat(sbi);  in fat_free_clusters()
575 		if (sbi->options.discard) {  in fat_free_clusters()
585 					fat_clus_to_blknr(sbi, first_cl),  in fat_free_clusters()
586 					nr_clus * sbi->sec_per_clus,  in fat_free_clusters()
594 		if (sbi->free_clusters != -1) {  in fat_free_clusters()
595 			sbi->free_clusters++;  in fat_free_clusters()
625 	unlock_fat(sbi);  in fat_free_clusters()
651 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_count_free_clusters()  local
652 	struct fatent_operations *ops = sbi->fatent_ops;  in fat_count_free_clusters()
657 	lock_fat(sbi);  in fat_count_free_clusters()
658 	if (sbi->free_clusters != -1 && sbi->free_clus_valid)  in fat_count_free_clusters()
668 	while (fatent.entry < sbi->max_cluster) {  in fat_count_free_clusters()
671 			unsigned long rest = sbi->fat_length - cur_block;  in fat_count_free_clusters()
683 		} while (fat_ent_next(sbi, &fatent));  in fat_count_free_clusters()
685 	sbi->free_clusters = free;  in fat_count_free_clusters()
686 	sbi->free_clus_valid = 1;  in fat_count_free_clusters()
690 	unlock_fat(sbi);  in fat_count_free_clusters()