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fs: fat: fill creation and change date

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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>
This commit is contained in:
Heinrich Schuchardt 2024-04-09 22:06:07 +02:00 • committed by Tom Rini
parent 3c1bc9f15c
commit ba23c378c5
1 changed files with 44 additions and 0 deletions
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44
fs/fat/fat_write.c
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@ -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];