#include <linux/module.h>
#include <linux/fs.h>
-#include <linux/msdos_fs.h>
#include <linux/buffer_head.h>
+#include <linux/time.h>
+#include "fat.h"
/*
- * fat_fs_panic reports a severe file system problem and sets the file system
- * read-only. The file system can be made writable again by remounting it.
+ * fat_fs_error reports a file system problem that might indicate fa data
+ * corruption/inconsistency. Depending on 'errors' mount option the
+ * panic() is called, or error message is printed FAT and nothing is done,
+ * or filesystem is remounted read-only (default behavior).
+ * In case the file system is remounted read-only, it can be made writable
+ * again by remounting it.
*/
-void fat_fs_panic(struct super_block *s, const char *fmt, ...)
+void fat_fs_error(struct super_block *s, const char *fmt, ...)
{
+ struct fat_mount_options *opts = &MSDOS_SB(s)->options;
va_list args;
- printk(KERN_ERR "FAT: Filesystem panic (dev %s)\n", s->s_id);
+ printk(KERN_ERR "FAT: Filesystem error (dev %s)\n", s->s_id);
printk(KERN_ERR " ");
va_start(args, fmt);
va_end(args);
printk("\n");
- if (!(s->s_flags & MS_RDONLY)) {
+ if (opts->errors == FAT_ERRORS_PANIC)
+ panic(" FAT fs panic from previous error\n");
+ else if (opts->errors == FAT_ERRORS_RO && !(s->s_flags & MS_RDONLY)) {
s->s_flags |= MS_RDONLY;
printk(KERN_ERR " File system has been set read-only\n");
}
}
-
-EXPORT_SYMBOL_GPL(fat_fs_panic);
+EXPORT_SYMBOL_GPL(fat_fs_error);
/* Flushes the number of free clusters on FAT32 */
/* XXX: Need to write one per FSINFO block. Currently only writes 1 */
-void fat_clusters_flush(struct super_block *sb)
+int fat_clusters_flush(struct super_block *sb)
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
struct buffer_head *bh;
struct fat_boot_fsinfo *fsinfo;
if (sbi->fat_bits != 32)
- return;
+ return 0;
bh = sb_bread(sb, sbi->fsinfo_sector);
if (bh == NULL) {
printk(KERN_ERR "FAT: bread failed in fat_clusters_flush\n");
- return;
+ return -EIO;
}
fsinfo = (struct fat_boot_fsinfo *)bh->b_data;
/* Sanity check */
if (!IS_FSINFO(fsinfo)) {
- printk(KERN_ERR "FAT: Did not find valid FSINFO signature.\n"
- " Found signature1 0x%08x signature2 0x%08x"
- " (sector = %lu)\n",
+ printk(KERN_ERR "FAT: Invalid FSINFO signature: "
+ "0x%08x, 0x%08x (sector = %lu)\n",
le32_to_cpu(fsinfo->signature1),
le32_to_cpu(fsinfo->signature2),
sbi->fsinfo_sector);
mark_buffer_dirty(bh);
}
brelse(bh);
+
+ return 0;
}
/*
MSDOS_I(inode)->i_start = new_dclus;
MSDOS_I(inode)->i_logstart = new_dclus;
/*
- * Since generic_osync_inode() synchronize later if
- * this is not directory, we don't here.
+ * Since generic_write_sync() synchronizes regular files later,
+ * we sync here only directories.
*/
if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode)) {
ret = fat_sync_inode(inode);
mark_inode_dirty(inode);
}
if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
- fat_fs_panic(sb, "clusters badly computed (%d != %lu)",
- new_fclus, inode->i_blocks >> (sbi->cluster_bits - 9));
+ fat_fs_error(sb, "clusters badly computed (%d != %llu)",
+ new_fclus,
+ (llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
fat_cache_inval_inode(inode);
}
inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9);
extern struct timezone sys_tz;
+/*
+ * The epoch of FAT timestamp is 1980.
+ * : bits : value
+ * date: 0 - 4: day (1 - 31)
+ * date: 5 - 8: month (1 - 12)
+ * date: 9 - 15: year (0 - 127) from 1980
+ * time: 0 - 4: sec (0 - 29) 2sec counts
+ * time: 5 - 10: min (0 - 59)
+ * time: 11 - 15: hour (0 - 23)
+ */
+#define SECS_PER_MIN 60
+#define SECS_PER_HOUR (60 * 60)
+#define SECS_PER_DAY (SECS_PER_HOUR * 24)
+/* days between 1.1.70 and 1.1.80 (2 leap days) */
+#define DAYS_DELTA (365 * 10 + 2)
+/* 120 (2100 - 1980) isn't leap year */
+#define YEAR_2100 120
+#define IS_LEAP_YEAR(y) (!((y) & 3) && (y) != YEAR_2100)
+
/* Linear day numbers of the respective 1sts in non-leap years. */
-static int day_n[] = {
- /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
- 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, 0
+static time_t days_in_year[] = {
+ /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
+ 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
};
-/* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
-int date_dos2unix(unsigned short time, unsigned short date)
+/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
+void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
+ __le16 __time, __le16 __date, u8 time_cs)
{
- int month, year, secs;
+ u16 time = le16_to_cpu(__time), date = le16_to_cpu(__date);
+ time_t second, day, leap_day, month, year;
- /*
- * first subtract and mask after that... Otherwise, if
- * date == 0, bad things happen
- */
- month = ((date >> 5) - 1) & 15;
- year = date >> 9;
- secs = (time & 31)*2+60*((time >> 5) & 63)+(time >> 11)*3600+86400*
- ((date & 31)-1+day_n[month]+(year/4)+year*365-((year & 3) == 0 &&
- month < 2 ? 1 : 0)+3653);
- /* days since 1.1.70 plus 80's leap day */
- secs += sys_tz.tz_minuteswest*60;
- return secs;
-}
+ year = date >> 9;
+ month = max(1, (date >> 5) & 0xf);
+ day = max(1, date & 0x1f) - 1;
-/* Convert linear UNIX date to a MS-DOS time/date pair. */
-void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
-{
- int day, year, nl_day, month;
-
- unix_date -= sys_tz.tz_minuteswest*60;
-
- /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
- if (unix_date < 315532800)
- unix_date = 315532800;
-
- *time = cpu_to_le16((unix_date % 60)/2+(((unix_date/60) % 60) << 5)+
- (((unix_date/3600) % 24) << 11));
- day = unix_date/86400-3652;
- year = day/365;
- if ((year+3)/4+365*year > day)
- year--;
- day -= (year+3)/4+365*year;
- if (day == 59 && !(year & 3)) {
- nl_day = day;
- month = 2;
+ leap_day = (year + 3) / 4;
+ if (year > YEAR_2100) /* 2100 isn't leap year */
+ leap_day--;
+ if (IS_LEAP_YEAR(year) && month > 2)
+ leap_day++;
+
+ second = (time & 0x1f) << 1;
+ second += ((time >> 5) & 0x3f) * SECS_PER_MIN;
+ second += (time >> 11) * SECS_PER_HOUR;
+ second += (year * 365 + leap_day
+ + days_in_year[month] + day
+ + DAYS_DELTA) * SECS_PER_DAY;
+
+ if (!sbi->options.tz_utc)
+ second += sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+ if (time_cs) {
+ ts->tv_sec = second + (time_cs / 100);
+ ts->tv_nsec = (time_cs % 100) * 10000000;
} else {
- nl_day = (year & 3) || day <= 59 ? day : day-1;
- for (month = 0; month < 12; month++) {
- if (day_n[month] > nl_day)
- break;
- }
+ ts->tv_sec = second;
+ ts->tv_nsec = 0;
}
- *date = cpu_to_le16(nl_day-day_n[month-1]+1+(month << 5)+(year << 9));
}
-EXPORT_SYMBOL_GPL(fat_date_unix2dos);
+/* Convert linear UNIX date to a FAT time/date pair. */
+void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
+ __le16 *time, __le16 *date, u8 *time_cs)
+{
+ struct tm tm;
+ time_to_tm(ts->tv_sec, sbi->options.tz_utc ? 0 :
+ -sys_tz.tz_minuteswest * 60, &tm);
+
+ /* FAT can only support year between 1980 to 2107 */
+ if (tm.tm_year < 1980 - 1900) {
+ *time = 0;
+ *date = cpu_to_le16((0 << 9) | (1 << 5) | 1);
+ if (time_cs)
+ *time_cs = 0;
+ return;
+ }
+ if (tm.tm_year > 2107 - 1900) {
+ *time = cpu_to_le16((23 << 11) | (59 << 5) | 29);
+ *date = cpu_to_le16((127 << 9) | (12 << 5) | 31);
+ if (time_cs)
+ *time_cs = 199;
+ return;
+ }
+
+ /* from 1900 -> from 1980 */
+ tm.tm_year -= 80;
+ /* 0~11 -> 1~12 */
+ tm.tm_mon++;
+ /* 0~59 -> 0~29(2sec counts) */
+ tm.tm_sec >>= 1;
+
+ *time = cpu_to_le16(tm.tm_hour << 11 | tm.tm_min << 5 | tm.tm_sec);
+ *date = cpu_to_le16(tm.tm_year << 9 | tm.tm_mon << 5 | tm.tm_mday);
+ if (time_cs)
+ *time_cs = (ts->tv_sec & 1) * 100 + ts->tv_nsec / 10000000;
+}
+EXPORT_SYMBOL_GPL(fat_time_unix2fat);
int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
{
- int i, e, err = 0;
+ int i, err = 0;
- for (i = 0; i < nr_bhs; i++) {
- lock_buffer(bhs[i]);
- if (test_clear_buffer_dirty(bhs[i])) {
- get_bh(bhs[i]);
- bhs[i]->b_end_io = end_buffer_write_sync;
- e = submit_bh(WRITE, bhs[i]);
- if (!err && e)
- err = e;
- } else
- unlock_buffer(bhs[i]);
- }
+ ll_rw_block(SWRITE, nr_bhs, bhs);
for (i = 0; i < nr_bhs; i++) {
wait_on_buffer(bhs[i]);
if (buffer_eopnotsupp(bhs[i])) {
}
return err;
}
-
-EXPORT_SYMBOL_GPL(fat_sync_bhs);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff