2  *  linux/fs/fat/misc.c
5  *  22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
10 #include <linux/fs.h>
19  * or filesystem is remounted read-only (default behavior).
20  * In case the file system is remounted read-only, it can be made writable
25 	struct fat_mount_options *opts = &MSDOS_SB(sb)->options;  in __fat_fs_error()
33 		printk(KERN_ERR "FAT-fs (%s): error, %pV\n", sb->s_id, &vaf);  in __fat_fs_error()
37 	if (opts->errors == FAT_ERRORS_PANIC)  in __fat_fs_error()
38 		panic("FAT-fs (%s): fs panic from previous error\n", sb->s_id);  in __fat_fs_error()
39 	else if (opts->errors == FAT_ERRORS_RO && !(sb->s_flags & MS_RDONLY)) {  in __fat_fs_error()
40 		sb->s_flags |= MS_RDONLY;  in __fat_fs_error()
41 		printk(KERN_ERR "FAT-fs (%s): Filesystem has been "  in __fat_fs_error()
42 				"set read-only\n", sb->s_id);  in __fat_fs_error()
48  * fat_msg() - print preformated FAT specific messages. Every thing what is
59 	printk("%sFAT-fs (%s): %pV\n", level, sb->s_id, &vaf);  in fat_msg()
71 	if (sbi->fat_bits != 32)  in fat_clusters_flush()
74 	bh = sb_bread(sb, sbi->fsinfo_sector);  in fat_clusters_flush()
77 		return -EIO;  in fat_clusters_flush()
80 	fsinfo = (struct fat_boot_fsinfo *)bh->b_data;  in fat_clusters_flush()
85 		       le32_to_cpu(fsinfo->signature1),  in fat_clusters_flush()
86 		       le32_to_cpu(fsinfo->signature2),  in fat_clusters_flush()
87 		       sbi->fsinfo_sector);  in fat_clusters_flush()
89 		if (sbi->free_clusters != -1)  in fat_clusters_flush()
90 			fsinfo->free_clusters = cpu_to_le32(sbi->free_clusters);  in fat_clusters_flush()
91 		if (sbi->prev_free != -1)  in fat_clusters_flush()
92 			fsinfo->next_cluster = cpu_to_le32(sbi->prev_free);  in fat_clusters_flush()
106 	struct super_block *sb = inode->i_sb;  in fat_chain_add()
111 	 * We must locate the last cluster of the file to add this new  in fat_chain_add()
115 	if (MSDOS_I(inode)->i_start) {  in fat_chain_add()
125 	/* add new one to the last of the cluster chain */  in fat_chain_add()
140 		MSDOS_I(inode)->i_start = new_dclus;  in fat_chain_add()
141 		MSDOS_I(inode)->i_logstart = new_dclus;  in fat_chain_add()
146 		if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode)) {  in fat_chain_add()
153 	if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {  in fat_chain_add()
156 			     (llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));  in fat_chain_add()
159 	inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9);  in fat_chain_add()
169  * date:  0 -  4: day	(1 -  31)
170  * date:  5 -  8: month	(1 -  12)
171  * date:  9 - 15: year	(0 - 127) from 1980
172  * time:  0 -  4: sec	(0 -  29) 2sec counts
173  * time:  5 - 10: min	(0 -  59)
174  * time: 11 - 15: hour	(0 -  23)
181 /* 120 (2100 - 1980) isn't leap year */
185 /* Linear day numbers of the respective 1sts in non-leap years. */
200 	day   = max(1, date & 0x1f) - 1;  in fat_time_fat2unix()
204 		leap_day--;  in fat_time_fat2unix()
215 	if (!sbi->options.tz_utc)  in fat_time_fat2unix()
219 		ts->tv_sec = second + (time_cs / 100);  in fat_time_fat2unix()
220 		ts->tv_nsec = (time_cs % 100) * 10000000;  in fat_time_fat2unix()
222 		ts->tv_sec = second;  in fat_time_fat2unix()
223 		ts->tv_nsec = 0;  in fat_time_fat2unix()
232 	time_to_tm(ts->tv_sec, sbi->options.tz_utc ? 0 :  in fat_time_unix2fat()
233 		   -sys_tz.tz_minuteswest * 60, &tm);  in fat_time_unix2fat()
236 	if (tm.tm_year < 1980 - 1900) {  in fat_time_unix2fat()
243 	if (tm.tm_year > 2107 - 1900) {  in fat_time_unix2fat()
251 	/* from 1900 -> from 1980 */  in fat_time_unix2fat()
252 	tm.tm_year -= 80;  in fat_time_unix2fat()
253 	/* 0~11 -> 1~12 */  in fat_time_unix2fat()
255 	/* 0~59 -> 0~29(2sec counts) */  in fat_time_unix2fat()
261 		*time_cs = (ts->tv_sec & 1) * 100 + ts->tv_nsec / 10000000;  in fat_time_unix2fat()
275 			err = -EIO;  in fat_sync_bhs()