1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
67 #define MAX_CHARSET_SIZE	6 /* max size of multi-byte character */
74 #define EXFAT_HINT_NONE		-1
78  * helpers for cluster size to byte conversion.
80 #define EXFAT_CLU_TO_B(b, sbi)		((b) << (sbi)->cluster_size_bits)
81 #define EXFAT_B_TO_CLU(b, sbi)		((b) >> (sbi)->cluster_size_bits)
83 	(((b - 1) >> (sbi)->cluster_size_bits) + 1)
84 #define EXFAT_CLU_OFFSET(off, sbi)	((off) & ((sbi)->cluster_size - 1))
89 #define EXFAT_BLK_TO_B(b, sb)		((b) << (sb)->s_blocksize_bits)
90 #define EXFAT_B_TO_BLK(b, sb)		((b) >> (sb)->s_blocksize_bits)
92 	(((b - 1) >> (sb)->s_blocksize_bits) + 1)
93 #define EXFAT_BLK_OFFSET(off, sb)	((off) & ((sb)->s_blocksize - 1))
99 	((b) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))
108 #define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \
109 	(((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits))
111 	((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1))
116 #define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS)
118 #define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE)
119 #define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1)
121 	((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits)
124 	((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1))
126 #define IGNORED_BITS_REMAINED(clu, clu_base) ((1 << ((clu) - (clu_base))) - 1)
154 	/* the cluster that first empty slot exists in */
162 		unsigned int off; /* cluster offset */
192  * exfat mount in-memory data
203 	/* on error: continue, panic, remount-ro */
205 	unsigned utf8:1, /* Use of UTF-8 character set */
213  * EXFAT file system superblock in-memory data
218 	unsigned int cluster_size; /* cluster size in bytes */
220 	unsigned int sect_per_clus; /* cluster size in sectors */
226 	unsigned int root_dir; /* root dir cluster */
227 	unsigned int dentries_per_clu; /* num of dentries per cluster */
232 	unsigned int map_clu; /* allocation bitmap start cluster */
238 	unsigned int clu_srch_ptr; /* cluster search pointer */
256  * EXFAT file system inode in-memory data
271 	/* hint for cluster last accessed */
285 	 * NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access.
289 	/* block-aligned i_size (used in cont_write_begin) */
291 	/* on-disk position of directory entry or 0 */
304 	return sb->s_fs_info;  in EXFAT_SB()
313  * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to
314  * save ATTR_RO instead of ->i_mode.
316  * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
321 	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);  in exfat_mode_can_hold_ro()
323 	if (S_ISDIR(inode->i_mode))  in exfat_mode_can_hold_ro()
326 	if ((~sbi->options.fs_fmask) & 0222)  in exfat_mode_can_hold_ro()
331 /* Convert attribute bits and a mask to the UNIX mode. */
333 		unsigned short attr, mode_t mode)  in exfat_make_mode()  argument
336 		mode &= ~0222;  in exfat_make_mode()
339 		return (mode & ~sbi->options.fs_dmask) | S_IFDIR;  in exfat_make_mode()
341 	return (mode & ~sbi->options.fs_fmask) | S_IFREG;  in exfat_make_mode()
347 	unsigned short attr = EXFAT_I(inode)->attr;  in exfat_make_attr()
349 	if (S_ISDIR(inode->i_mode))  in exfat_make_attr()
351 	if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))  in exfat_make_attr()
359 		EXFAT_I(inode)->attr = attr & (ATTR_RWMASK | ATTR_READONLY);  in exfat_save_attr()
361 		EXFAT_I(inode)->attr = attr & ATTR_RWMASK;  in exfat_save_attr()
367 	return ((sec - sbi->data_start_sector + 1) &  in exfat_is_last_sector_in_cluster()
368 		((1 << sbi->sect_per_clus_bits) - 1)) == 0;  in exfat_is_last_sector_in_cluster()
374 	return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) +  in exfat_cluster_to_sector()
375 		sbi->data_start_sector;  in exfat_cluster_to_sector()
381 	return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) +  in exfat_sector_to_cluster()
388 	return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters;  in is_valid_cluster()
446 int exfat_get_cluster(struct inode *inode, unsigned int cluster,
510 		__exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \
515 	pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
517 	pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
519 	pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
521 	pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)