26 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat12_ent_blocknr()  local
28 	WARN_ON(!fat_valid_entry(sbi, entry));  in fat12_ent_blocknr()
30 	*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);  in fat12_ent_blocknr()
36 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_blocknr()  local
37 	int bytes = (entry << sbi->fatent_shift);  in fat_ent_blocknr()
38 	WARN_ON(!fat_valid_entry(sbi, entry));  in fat_ent_blocknr()
40 	*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);  in fat_ent_blocknr()
279 static inline void lock_fat(struct msdos_sb_info *sbi)  in lock_fat()  argument
281 	mutex_lock(&sbi->fat_lock);  in lock_fat()
284 static inline void unlock_fat(struct msdos_sb_info *sbi)  in unlock_fat()  argument
286 	mutex_unlock(&sbi->fat_lock);  in unlock_fat()
291 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_access_init()  local
293 	mutex_init(&sbi->fat_lock);  in fat_ent_access_init()
295 	if (is_fat32(sbi)) {  in fat_ent_access_init()
296 		sbi->fatent_shift = 2;  in fat_ent_access_init()
297 		sbi->fatent_ops = &fat32_ops;  in fat_ent_access_init()
298 	} else if (is_fat16(sbi)) {  in fat_ent_access_init()
299 		sbi->fatent_shift = 1;  in fat_ent_access_init()
300 		sbi->fatent_ops = &fat16_ops;  in fat_ent_access_init()
301 	} else if (is_fat12(sbi)) {  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()
305 		fat_fs_error(sb, "invalid FAT variant, %u bits", sbi->fat_bits);  in fat_ent_access_init()
311 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in mark_fsinfo_dirty()  local
313 	if (sb_rdonly(sb) || !is_fat32(sbi))  in mark_fsinfo_dirty()
316 	__mark_inode_dirty(sbi->fsinfo_inode, I_DIRTY_SYNC);  in mark_fsinfo_dirty()
323 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_update_ptr()  local
324 	const struct fatent_operations *ops = sbi->fatent_ops;  in fat_ent_update_ptr()
330 	if (is_fat12(sbi)) {  in fat_ent_update_ptr()
352 	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);  in fat_ent_read()  local
353 	const struct fatent_operations *ops = sbi->fatent_ops;  in fat_ent_read()
357 	if (!fat_valid_entry(sbi, entry)) {  in fat_ent_read()
379 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_mirror_bhs()  local
384 	for (copy = 1; copy < sbi->fats; copy++) {  in fat_mirror_bhs()
385 		sector_t backup_fat = sbi->fat_length * copy;  in fat_mirror_bhs()
398 			mark_buffer_dirty_inode(c_bh, sbi->fat_inode);  in fat_mirror_bhs()
426 static inline int fat_ent_next(struct msdos_sb_info *sbi,  in fat_ent_next()  argument
429 	if (sbi->fatent_ops->ent_next(fatent)) {  in fat_ent_next()
430 		if (fatent->entry < sbi->max_cluster)  in fat_ent_next()
469 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_alloc_clusters()  local
470 	const struct fatent_operations *ops = sbi->fatent_ops;  in fat_alloc_clusters()
477 	lock_fat(sbi);  in fat_alloc_clusters()
478 	if (sbi->free_clusters != -1 && sbi->free_clus_valid &&  in fat_alloc_clusters()
479 	    sbi->free_clusters < nr_cluster) {  in fat_alloc_clusters()
480 		unlock_fat(sbi);  in fat_alloc_clusters()
488 	fatent_set_entry(&fatent, sbi->prev_free + 1);  in fat_alloc_clusters()
489 	while (count < sbi->max_cluster) {  in fat_alloc_clusters()
490 		if (fatent.entry >= sbi->max_cluster)  in fat_alloc_clusters()
509 				sbi->prev_free = entry;  in fat_alloc_clusters()
510 				if (sbi->free_clusters != -1)  in fat_alloc_clusters()
511 					sbi->free_clusters--;  in fat_alloc_clusters()
525 			if (count == sbi->max_cluster)  in fat_alloc_clusters()
527 		} while (fat_ent_next(sbi, &fatent));  in fat_alloc_clusters()
531 	sbi->free_clusters = 0;  in fat_alloc_clusters()
532 	sbi->free_clus_valid = 1;  in fat_alloc_clusters()
536 	unlock_fat(sbi);  in fat_alloc_clusters()
557 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_free_clusters()  local
558 	const struct fatent_operations *ops = sbi->fatent_ops;  in fat_free_clusters()
566 	lock_fat(sbi);  in fat_free_clusters()
579 		if (sbi->options.discard) {  in fat_free_clusters()
589 					fat_clus_to_blknr(sbi, first_cl),  in fat_free_clusters()
590 					nr_clus * sbi->sec_per_clus,  in fat_free_clusters()
598 		if (sbi->free_clusters != -1) {  in fat_free_clusters()
599 			sbi->free_clusters++;  in fat_free_clusters()
629 	unlock_fat(sbi);  in fat_free_clusters()
650 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ra_init()  local
651 	const struct fatent_operations *ops = sbi->fatent_ops;  in fat_ra_init()
690 		struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_ent_reada()  local
691 		const struct fatent_operations *ops = sbi->fatent_ops;  in fat_ent_reada()
718 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_count_free_clusters()  local
719 	const struct fatent_operations *ops = sbi->fatent_ops;  in fat_count_free_clusters()
724 	lock_fat(sbi);  in fat_count_free_clusters()
725 	if (sbi->free_clusters != -1 && sbi->free_clus_valid)  in fat_count_free_clusters()
731 	fat_ra_init(sb, &fatent_ra, &fatent, sbi->max_cluster);  in fat_count_free_clusters()
732 	while (fatent.entry < sbi->max_cluster) {  in fat_count_free_clusters()
743 		} while (fat_ent_next(sbi, &fatent));  in fat_count_free_clusters()
746 	sbi->free_clusters = free;  in fat_count_free_clusters()
747 	sbi->free_clus_valid = 1;  in fat_count_free_clusters()
751 	unlock_fat(sbi);  in fat_count_free_clusters()
757 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_trim_clusters()  local
758 	return sb_issue_discard(sb, fat_clus_to_blknr(sbi, clus),  in fat_trim_clusters()
759 				nr_clus * sbi->sec_per_clus, GFP_NOFS, 0);  in fat_trim_clusters()
765 	struct msdos_sb_info *sbi = MSDOS_SB(sb);  in fat_trim_fs()  local
766 	const struct fatent_operations *ops = sbi->fatent_ops;  in fat_trim_fs()
779 	ent_start = max_t(u64, range->start>>sbi->cluster_bits, FAT_START_ENT);  in fat_trim_fs()
780 	ent_end = ent_start + (range->len >> sbi->cluster_bits) - 1;  in fat_trim_fs()
781 	minlen = range->minlen >> sbi->cluster_bits;  in fat_trim_fs()
783 	if (ent_start >= sbi->max_cluster || range->len < sbi->cluster_size)  in fat_trim_fs()
785 	if (ent_end >= sbi->max_cluster)  in fat_trim_fs()
786 		ent_end = sbi->max_cluster - 1;  in fat_trim_fs()
789 	lock_fat(sbi);  in fat_trim_fs()
815 		} while (fat_ent_next(sbi, &fatent) && fatent.entry <= ent_end);  in fat_trim_fs()
824 			unlock_fat(sbi);  in fat_trim_fs()
826 			lock_fat(sbi);  in fat_trim_fs()
843 	unlock_fat(sbi);  in fat_trim_fs()
845 	range->len = trimmed << sbi->cluster_bits;  in fat_trim_fs()