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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/fat/misc.c | |
3 | * | |
4 | * Written 1992,1993 by Werner Almesberger | |
5 | * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980 | |
6 | * and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru) | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/fs.h> | |
1da177e4 | 11 | #include <linux/buffer_head.h> |
1d81a181 | 12 | #include <linux/time.h> |
9e975dae | 13 | #include "fat.h" |
1da177e4 LT |
14 | |
15 | /* | |
85c78591 DK |
16 | * fat_fs_error reports a file system problem that might indicate fa data |
17 | * corruption/inconsistency. Depending on 'errors' mount option the | |
18 | * panic() is called, or error message is printed FAT and nothing is done, | |
19 | * or filesystem is remounted read-only (default behavior). | |
20 | * In case the file system is remounted read-only, it can be made writable | |
21 | * again by remounting it. | |
1da177e4 | 22 | */ |
2c8a5ffb | 23 | void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...) |
1da177e4 | 24 | { |
2c8a5ffb | 25 | struct fat_mount_options *opts = &MSDOS_SB(sb)->options; |
1da177e4 | 26 | va_list args; |
2c8a5ffb | 27 | struct va_format vaf; |
1da177e4 | 28 | |
aaa04b48 | 29 | if (report) { |
aaa04b48 | 30 | va_start(args, fmt); |
2c8a5ffb AF |
31 | vaf.fmt = fmt; |
32 | vaf.va = &args; | |
33 | printk(KERN_ERR "FAT-fs (%s): error, %pV\n", sb->s_id, &vaf); | |
aaa04b48 | 34 | va_end(args); |
aaa04b48 | 35 | } |
1da177e4 | 36 | |
85c78591 | 37 | if (opts->errors == FAT_ERRORS_PANIC) |
2c8a5ffb AF |
38 | panic("FAT-fs (%s): fs panic from previous error\n", sb->s_id); |
39 | else if (opts->errors == FAT_ERRORS_RO && !(sb->s_flags & MS_RDONLY)) { | |
40 | sb->s_flags |= MS_RDONLY; | |
41 | printk(KERN_ERR "FAT-fs (%s): Filesystem has been " | |
42 | "set read-only\n", sb->s_id); | |
1da177e4 LT |
43 | } |
44 | } | |
aaa04b48 | 45 | EXPORT_SYMBOL_GPL(__fat_fs_error); |
1da177e4 | 46 | |
81ac21d3 AF |
47 | /** |
48 | * fat_msg() - print preformated FAT specific messages. Every thing what is | |
49 | * not fat_fs_error() should be fat_msg(). | |
50 | */ | |
51 | void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...) | |
52 | { | |
53 | struct va_format vaf; | |
54 | va_list args; | |
55 | ||
56 | va_start(args, fmt); | |
57 | vaf.fmt = fmt; | |
58 | vaf.va = &args; | |
59 | printk("%sFAT-fs (%s): %pV\n", level, sb->s_id, &vaf); | |
60 | va_end(args); | |
61 | } | |
62 | ||
1da177e4 LT |
63 | /* Flushes the number of free clusters on FAT32 */ |
64 | /* XXX: Need to write one per FSINFO block. Currently only writes 1 */ | |
ed248b29 | 65 | int fat_clusters_flush(struct super_block *sb) |
1da177e4 LT |
66 | { |
67 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
68 | struct buffer_head *bh; | |
69 | struct fat_boot_fsinfo *fsinfo; | |
70 | ||
71 | if (sbi->fat_bits != 32) | |
ed248b29 | 72 | return 0; |
1da177e4 LT |
73 | |
74 | bh = sb_bread(sb, sbi->fsinfo_sector); | |
75 | if (bh == NULL) { | |
869f58c0 | 76 | fat_msg(sb, KERN_ERR, "bread failed in fat_clusters_flush"); |
ed248b29 | 77 | return -EIO; |
1da177e4 LT |
78 | } |
79 | ||
80 | fsinfo = (struct fat_boot_fsinfo *)bh->b_data; | |
81 | /* Sanity check */ | |
82 | if (!IS_FSINFO(fsinfo)) { | |
869f58c0 AF |
83 | fat_msg(sb, KERN_ERR, "Invalid FSINFO signature: " |
84 | "0x%08x, 0x%08x (sector = %lu)", | |
1da177e4 LT |
85 | le32_to_cpu(fsinfo->signature1), |
86 | le32_to_cpu(fsinfo->signature2), | |
87 | sbi->fsinfo_sector); | |
88 | } else { | |
89 | if (sbi->free_clusters != -1) | |
90 | fsinfo->free_clusters = cpu_to_le32(sbi->free_clusters); | |
91 | if (sbi->prev_free != -1) | |
92 | fsinfo->next_cluster = cpu_to_le32(sbi->prev_free); | |
93 | mark_buffer_dirty(bh); | |
1da177e4 LT |
94 | } |
95 | brelse(bh); | |
ed248b29 OH |
96 | |
97 | return 0; | |
1da177e4 LT |
98 | } |
99 | ||
100 | /* | |
101 | * fat_chain_add() adds a new cluster to the chain of clusters represented | |
102 | * by inode. | |
103 | */ | |
104 | int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster) | |
105 | { | |
106 | struct super_block *sb = inode->i_sb; | |
107 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
108 | int ret, new_fclus, last; | |
109 | ||
110 | /* | |
111 | * We must locate the last cluster of the file to add this new | |
112 | * one (new_dclus) to the end of the link list (the FAT). | |
113 | */ | |
114 | last = new_fclus = 0; | |
115 | if (MSDOS_I(inode)->i_start) { | |
116 | int fclus, dclus; | |
117 | ||
118 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); | |
119 | if (ret < 0) | |
120 | return ret; | |
121 | new_fclus = fclus + 1; | |
122 | last = dclus; | |
123 | } | |
124 | ||
125 | /* add new one to the last of the cluster chain */ | |
126 | if (last) { | |
127 | struct fat_entry fatent; | |
128 | ||
129 | fatent_init(&fatent); | |
130 | ret = fat_ent_read(inode, &fatent, last); | |
131 | if (ret >= 0) { | |
132 | int wait = inode_needs_sync(inode); | |
133 | ret = fat_ent_write(inode, &fatent, new_dclus, wait); | |
134 | fatent_brelse(&fatent); | |
135 | } | |
136 | if (ret < 0) | |
137 | return ret; | |
c39540c6 R |
138 | /* |
139 | * FIXME:Although we can add this cache, fat_cache_add() is | |
140 | * assuming to be called after linear search with fat_cache_id. | |
141 | */ | |
1da177e4 LT |
142 | // fat_cache_add(inode, new_fclus, new_dclus); |
143 | } else { | |
144 | MSDOS_I(inode)->i_start = new_dclus; | |
145 | MSDOS_I(inode)->i_logstart = new_dclus; | |
146 | /* | |
2f3d675b JK |
147 | * Since generic_write_sync() synchronizes regular files later, |
148 | * we sync here only directories. | |
1da177e4 LT |
149 | */ |
150 | if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode)) { | |
151 | ret = fat_sync_inode(inode); | |
152 | if (ret) | |
153 | return ret; | |
154 | } else | |
155 | mark_inode_dirty(inode); | |
156 | } | |
157 | if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) { | |
85c78591 | 158 | fat_fs_error(sb, "clusters badly computed (%d != %llu)", |
c3302931 OH |
159 | new_fclus, |
160 | (llu)(inode->i_blocks >> (sbi->cluster_bits - 9))); | |
1da177e4 LT |
161 | fat_cache_inval_inode(inode); |
162 | } | |
163 | inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | extern struct timezone sys_tz; | |
169 | ||
7decd1cb OH |
170 | /* |
171 | * The epoch of FAT timestamp is 1980. | |
172 | * : bits : value | |
173 | * date: 0 - 4: day (1 - 31) | |
174 | * date: 5 - 8: month (1 - 12) | |
175 | * date: 9 - 15: year (0 - 127) from 1980 | |
176 | * time: 0 - 4: sec (0 - 29) 2sec counts | |
177 | * time: 5 - 10: min (0 - 59) | |
178 | * time: 11 - 15: hour (0 - 23) | |
179 | */ | |
180 | #define SECS_PER_MIN 60 | |
181 | #define SECS_PER_HOUR (60 * 60) | |
182 | #define SECS_PER_DAY (SECS_PER_HOUR * 24) | |
7decd1cb OH |
183 | /* days between 1.1.70 and 1.1.80 (2 leap days) */ |
184 | #define DAYS_DELTA (365 * 10 + 2) | |
185 | /* 120 (2100 - 1980) isn't leap year */ | |
186 | #define YEAR_2100 120 | |
187 | #define IS_LEAP_YEAR(y) (!((y) & 3) && (y) != YEAR_2100) | |
188 | ||
1da177e4 | 189 | /* Linear day numbers of the respective 1sts in non-leap years. */ |
7decd1cb OH |
190 | static time_t days_in_year[] = { |
191 | /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */ | |
192 | 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, | |
1da177e4 LT |
193 | }; |
194 | ||
7decd1cb OH |
195 | /* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */ |
196 | void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts, | |
197 | __le16 __time, __le16 __date, u8 time_cs) | |
1da177e4 | 198 | { |
7decd1cb OH |
199 | u16 time = le16_to_cpu(__time), date = le16_to_cpu(__date); |
200 | time_t second, day, leap_day, month, year; | |
1da177e4 | 201 | |
7decd1cb OH |
202 | year = date >> 9; |
203 | month = max(1, (date >> 5) & 0xf); | |
204 | day = max(1, date & 0x1f) - 1; | |
205 | ||
206 | leap_day = (year + 3) / 4; | |
207 | if (year > YEAR_2100) /* 2100 isn't leap year */ | |
208 | leap_day--; | |
209 | if (IS_LEAP_YEAR(year) && month > 2) | |
210 | leap_day++; | |
211 | ||
212 | second = (time & 0x1f) << 1; | |
213 | second += ((time >> 5) & 0x3f) * SECS_PER_MIN; | |
214 | second += (time >> 11) * SECS_PER_HOUR; | |
215 | second += (year * 365 + leap_day | |
216 | + days_in_year[month] + day | |
217 | + DAYS_DELTA) * SECS_PER_DAY; | |
218 | ||
58156c8f | 219 | if (!sbi->options.tz_set) |
7decd1cb | 220 | second += sys_tz.tz_minuteswest * SECS_PER_MIN; |
58156c8f JK |
221 | else |
222 | second -= sbi->options.time_offset * SECS_PER_MIN; | |
7decd1cb OH |
223 | |
224 | if (time_cs) { | |
225 | ts->tv_sec = second + (time_cs / 100); | |
226 | ts->tv_nsec = (time_cs % 100) * 10000000; | |
227 | } else { | |
228 | ts->tv_sec = second; | |
229 | ts->tv_nsec = 0; | |
230 | } | |
1da177e4 LT |
231 | } |
232 | ||
7decd1cb OH |
233 | /* Convert linear UNIX date to a FAT time/date pair. */ |
234 | void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts, | |
235 | __le16 *time, __le16 *date, u8 *time_cs) | |
1da177e4 | 236 | { |
1d81a181 | 237 | struct tm tm; |
58156c8f JK |
238 | time_to_tm(ts->tv_sec, |
239 | (sbi->options.tz_set ? sbi->options.time_offset : | |
240 | -sys_tz.tz_minuteswest) * SECS_PER_MIN, &tm); | |
1da177e4 | 241 | |
1d81a181 Z |
242 | /* FAT can only support year between 1980 to 2107 */ |
243 | if (tm.tm_year < 1980 - 1900) { | |
7decd1cb OH |
244 | *time = 0; |
245 | *date = cpu_to_le16((0 << 9) | (1 << 5) | 1); | |
246 | if (time_cs) | |
247 | *time_cs = 0; | |
248 | return; | |
249 | } | |
1d81a181 | 250 | if (tm.tm_year > 2107 - 1900) { |
7decd1cb OH |
251 | *time = cpu_to_le16((23 << 11) | (59 << 5) | 29); |
252 | *date = cpu_to_le16((127 << 9) | (12 << 5) | 31); | |
253 | if (time_cs) | |
254 | *time_cs = 199; | |
255 | return; | |
256 | } | |
7decd1cb | 257 | |
1d81a181 Z |
258 | /* from 1900 -> from 1980 */ |
259 | tm.tm_year -= 80; | |
260 | /* 0~11 -> 1~12 */ | |
261 | tm.tm_mon++; | |
262 | /* 0~59 -> 0~29(2sec counts) */ | |
263 | tm.tm_sec >>= 1; | |
1da177e4 | 264 | |
1d81a181 Z |
265 | *time = cpu_to_le16(tm.tm_hour << 11 | tm.tm_min << 5 | tm.tm_sec); |
266 | *date = cpu_to_le16(tm.tm_year << 9 | tm.tm_mon << 5 | tm.tm_mday); | |
7decd1cb OH |
267 | if (time_cs) |
268 | *time_cs = (ts->tv_sec & 1) * 100 + ts->tv_nsec / 10000000; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(fat_time_unix2fat); | |
1da177e4 LT |
271 | |
272 | int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs) | |
273 | { | |
5b00226d | 274 | int i, err = 0; |
1da177e4 | 275 | |
9cb569d6 CH |
276 | for (i = 0; i < nr_bhs; i++) |
277 | write_dirty_buffer(bhs[i], WRITE); | |
278 | ||
1da177e4 LT |
279 | for (i = 0; i < nr_bhs; i++) { |
280 | wait_on_buffer(bhs[i]); | |
0edd55fa | 281 | if (!err && !buffer_uptodate(bhs[i])) |
1da177e4 LT |
282 | err = -EIO; |
283 | } | |
284 | return err; | |
285 | } |