fs: fat: fill creation and change date
The FAT specification requires that the change date is set.
If a DM RTC device exists, set the creation and change date to the current
date when updating the directory entry. Otherwise use the date 2020-01-01.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index 8b5d669..c8e0fbf 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -18,6 +18,7 @@
#include <rand.h>
#include <asm/byteorder.h>
#include <asm/cache.h>
+#include <dm/uclass.h>
#include <linux/ctype.h>
#include <linux/math64.h>
#include "fat.c"
@@ -1152,6 +1153,41 @@
}
/**
+ * dentry_set_time() - set change time
+ *
+ * @dentptr: directory entry
+ */
+static void dentry_set_time(dir_entry *dentptr)
+{
+ if (CONFIG_IS_ENABLED(DM_RTC)) {
+ struct udevice *dev;
+ struct rtc_time tm;
+ u16 date;
+ u16 time;
+
+ uclass_first_device(UCLASS_RTC, &dev);
+ if (!dev)
+ goto err;
+ if (dm_rtc_get(dev, &tm))
+ goto err;
+ if (tm.tm_year < 1980 || tm.tm_year > 2107)
+ goto err;
+ date = (tm.tm_mday & 0x1f) |
+ ((tm.tm_mon & 0xf) << 5) |
+ ((tm.tm_year - 1980) << 9);
+ time = (tm.tm_sec > 1) |
+ ((tm.tm_min & 0x3f) << 5) |
+ (tm.tm_hour << 11);
+ dentptr->date = date;
+ dentptr->time = time;
+ return;
+ }
+err:
+ dentptr->date = 0x2821; /* 2000-01-01 */
+ dentptr->time = 0;
+}
+
+/**
* fill_dentry() - fill directory entry with shortname
*
* @mydata: private filesystem parameters
@@ -1171,6 +1207,12 @@
dentptr->attr = attr;
+ /* Set change date */
+ dentry_set_time(dentptr);
+ /* Set creation date */
+ dentptr->cdate = dentptr->date;
+ dentptr->ctime = dentptr->time;
+
memcpy(&dentptr->nameext, shortname, SHORT_NAME_SIZE);
}
@@ -1376,6 +1418,8 @@
/* Update file size in a directory entry */
retdent->size = cpu_to_le32(pos + size);
+ /* Update change date */
+ dentry_set_time(retdent);
} else {
/* Create a new file */
char shortname[SHORT_NAME_SIZE];