'f_chdir' can not work well (IDFGH-14025)

[hibfh]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I need to use the api "f_chdir" to change the directory In my FTP server part.
I mount the emmc to fatfs vfs already
,when I try f_chdir(MOUNT_POINT),It do works,but in trouble with f_chdir(MOUNT_POINT/subdir).It return 5 which means path invalid，and i'm sure it exists.
And I change the config below
#define FF_FS_RPATH 2
#define FF_STR_VOLUME_ID 2
#define FF_VOLUME_STRS "MOUNT_POINT1","MOUNT_POINT2"
Need some helps ，thx

[nopnop2002]

when I try f_chdir(MOUNT_POINT),It do works

Have you checked the return value of f_chdir?
It's probably not 0.

int ret = f_chdir(MOUNT_POINT);
printf("ret=%d\n", ret);