1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
22 	if (sbi->FAT2_start_sector != sbi->FAT1_start_sector) {  in exfat_mirror_bh()
23 		sec2 = sec - sbi->FAT1_start_sector + sbi->FAT2_start_sector;  in exfat_mirror_bh()
26 			return -ENOMEM;  in exfat_mirror_bh()
27 		memcpy(c_bh->b_data, bh->b_data, sb->s_blocksize);  in exfat_mirror_bh()
30 		if (sb->s_flags & SB_SYNCHRONOUS)  in exfat_mirror_bh()
50 		return -EIO;  in __exfat_ent_get()
52 	*content = le32_to_cpu(*(__le32 *)(&bh->b_data[off]));  in __exfat_ent_get()
75 		return -EIO;  in exfat_ent_set()
77 	fat_entry = (__le32 *)&(bh->b_data[off]);  in exfat_ent_set()
79 	exfat_update_bh(bh, sb->s_flags & SB_SYNCHRONOUS);  in exfat_ent_set()
94 		return -EIO;  in exfat_ent_get()
107 			"invalid access to FAT free cluster (entry 0x%08x)",  in exfat_ent_get()
109 		return -EIO;  in exfat_ent_get()
114 			"invalid access to FAT bad cluster (entry 0x%08x)",  in exfat_ent_get()
116 		return -EIO;  in exfat_ent_get()
123 		return -EIO;  in exfat_ent_get()
137 			return -EIO;  in exfat_chain_cont_cluster()
139 		len--;  in exfat_chain_cont_cluster()
143 		return -EIO;  in exfat_chain_cont_cluster()
150 	struct super_block *sb = inode->i_sb;  in __exfat_free_cluster()
156 	/* invalid cluster number */  in __exfat_free_cluster()
157 	if (p_chain->dir == EXFAT_FREE_CLUSTER ||  in __exfat_free_cluster()
158 	    p_chain->dir == EXFAT_EOF_CLUSTER ||  in __exfat_free_cluster()
159 	    p_chain->dir < EXFAT_FIRST_CLUSTER)  in __exfat_free_cluster()
162 	/* no cluster to truncate */  in __exfat_free_cluster()
163 	if (p_chain->size == 0)  in __exfat_free_cluster()
166 	/* check cluster validation */  in __exfat_free_cluster()
167 	if (!is_valid_cluster(sbi, p_chain->dir)) {  in __exfat_free_cluster()
168 		exfat_err(sb, "invalid start cluster (%u)", p_chain->dir);  in __exfat_free_cluster()
169 		return -EIO;  in __exfat_free_cluster()
172 	clu = p_chain->dir;  in __exfat_free_cluster()
177 	if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {  in __exfat_free_cluster()
178 		unsigned int last_cluster = p_chain->dir + p_chain->size - 1;  in __exfat_free_cluster()
186 			/* flush bitmap only if index would be changed or for last cluster */  in __exfat_free_cluster()
195 		} while (num_clusters < p_chain->size);  in __exfat_free_cluster()
223 	sbi->used_clusters -= num_clusters;  in __exfat_free_cluster()
231 	mutex_lock(&EXFAT_SB(inode->i_sb)->bitmap_lock);  in exfat_free_cluster()
233 	mutex_unlock(&EXFAT_SB(inode->i_sb)->bitmap_lock);  in exfat_free_cluster()
244 	next = p_chain->dir;  in exfat_find_last_cluster()
245 	if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {  in exfat_find_last_cluster()
246 		*ret_clu = next + p_chain->size - 1;  in exfat_find_last_cluster()
254 			return -EIO;  in exfat_find_last_cluster()
257 	if (p_chain->size != count) {  in exfat_find_last_cluster()
260 			p_chain->size, count);  in exfat_find_last_cluster()
261 		return -EIO;  in exfat_find_last_cluster()
270 	struct super_block *sb = dir->i_sb;  in exfat_zeroed_cluster()
276 	last_blknr = blknr + sbi->sect_per_clus;  in exfat_zeroed_cluster()
278 	if (last_blknr > sbi->num_sectors && sbi->num_sectors > 0) {  in exfat_zeroed_cluster()
282 			sbi->sect_per_clus);  in exfat_zeroed_cluster()
283 		return -EIO;  in exfat_zeroed_cluster()
286 	/* Zeroing the unused blocks on this cluster */  in exfat_zeroed_cluster()
290 			return -ENOMEM;  in exfat_zeroed_cluster()
292 		memset(bh->b_data, 0, sb->s_blocksize);  in exfat_zeroed_cluster()
299 		return sync_blockdev_range(sb->s_bdev,  in exfat_zeroed_cluster()
301 				EXFAT_BLK_TO_B(last_blknr, sb) - 1);  in exfat_zeroed_cluster()
309 	int ret = -ENOSPC;  in exfat_alloc_cluster()
312 	struct super_block *sb = inode->i_sb;  in exfat_alloc_cluster()
317 	if (unlikely(total_cnt < sbi->used_clusters)) {  in exfat_alloc_cluster()
320 			__func__, total_cnt, sbi->used_clusters);  in exfat_alloc_cluster()
321 		return -EIO;  in exfat_alloc_cluster()
324 	if (num_alloc > total_cnt - sbi->used_clusters)  in exfat_alloc_cluster()
325 		return -ENOSPC;  in exfat_alloc_cluster()
327 	mutex_lock(&sbi->bitmap_lock);  in exfat_alloc_cluster()
329 	hint_clu = p_chain->dir;  in exfat_alloc_cluster()
330 	/* find new cluster */  in exfat_alloc_cluster()
332 		if (sbi->clu_srch_ptr < EXFAT_FIRST_CLUSTER) {  in exfat_alloc_cluster()
333 			exfat_err(sb, "sbi->clu_srch_ptr is invalid (%u)",  in exfat_alloc_cluster()
334 				  sbi->clu_srch_ptr);  in exfat_alloc_cluster()
335 			sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER;  in exfat_alloc_cluster()
338 		hint_clu = exfat_find_free_bitmap(sb, sbi->clu_srch_ptr);  in exfat_alloc_cluster()
340 			ret = -ENOSPC;  in exfat_alloc_cluster()
345 	/* check cluster validation */  in exfat_alloc_cluster()
347 		if (hint_clu != sbi->num_clusters)  in exfat_alloc_cluster()
348 			exfat_err(sb, "hint_cluster is invalid (%u), rewind to the first cluster",  in exfat_alloc_cluster()
351 		p_chain->flags = ALLOC_FAT_CHAIN;  in exfat_alloc_cluster()
354 	p_chain->dir = EXFAT_EOF_CLUSTER;  in exfat_alloc_cluster()
359 		    p_chain->flags == ALLOC_NO_FAT_CHAIN) {  in exfat_alloc_cluster()
360 			if (exfat_chain_cont_cluster(sb, p_chain->dir,  in exfat_alloc_cluster()
361 					p_chain->size)) {  in exfat_alloc_cluster()
362 				ret = -EIO;  in exfat_alloc_cluster()
365 			p_chain->flags = ALLOC_FAT_CHAIN;  in exfat_alloc_cluster()
370 			ret = -EIO;  in exfat_alloc_cluster()
375 		if (p_chain->flags == ALLOC_FAT_CHAIN) {  in exfat_alloc_cluster()
377 				ret = -EIO;  in exfat_alloc_cluster()
382 		if (p_chain->dir == EXFAT_EOF_CLUSTER) {  in exfat_alloc_cluster()
383 			p_chain->dir = new_clu;  in exfat_alloc_cluster()
384 		} else if (p_chain->flags == ALLOC_FAT_CHAIN) {  in exfat_alloc_cluster()
386 				ret = -EIO;  in exfat_alloc_cluster()
390 		p_chain->size++;  in exfat_alloc_cluster()
394 		if (p_chain->size == num_alloc) {  in exfat_alloc_cluster()
395 			sbi->clu_srch_ptr = hint_clu;  in exfat_alloc_cluster()
396 			sbi->used_clusters += num_alloc;  in exfat_alloc_cluster()
398 			mutex_unlock(&sbi->bitmap_lock);  in exfat_alloc_cluster()
403 		if (hint_clu >= sbi->num_clusters) {  in exfat_alloc_cluster()
406 			if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {  in exfat_alloc_cluster()
407 				if (exfat_chain_cont_cluster(sb, p_chain->dir,  in exfat_alloc_cluster()
408 						p_chain->size)) {  in exfat_alloc_cluster()
409 					ret = -EIO;  in exfat_alloc_cluster()
412 				p_chain->flags = ALLOC_FAT_CHAIN;  in exfat_alloc_cluster()
419 	mutex_unlock(&sbi->bitmap_lock);  in exfat_alloc_cluster()
430 	if (!p_chain->dir || p_chain->dir == EXFAT_EOF_CLUSTER) {  in exfat_count_num_clusters()
435 	if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {  in exfat_count_num_clusters()
436 		*ret_count = p_chain->size;  in exfat_count_num_clusters()
440 	clu = p_chain->dir;  in exfat_count_num_clusters()
442 	for (i = EXFAT_FIRST_CLUSTER; i < sbi->num_clusters; i++) {  in exfat_count_num_clusters()
445 			return -EIO;  in exfat_count_num_clusters()