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 8b5d669b00503d0306cf62eba45f23544e4f4d85..c8e0fbf1a3b3d0b8e5458d10c5b2aa7af0a60681 100644 (file)
--- 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"
@@ -1151,6 +1152,41 @@ getit:
        return 0;
 }
 
+/**
+ * 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
  *
@@ -1171,6 +1207,12 @@ static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
 
        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 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
 
                /* 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];