ESP-IDF Littlefs + esp_vfs_readdir (IDFGH-8649)

[ifoxbr]

Answers checklist.

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

General issue report

Can someone explain to me what this routine does? When debugging my program, the debug always stops at this routine. I use littlefs, does anyone know what I'm doing wrong and how to avoid this error?

struct dirent* esp_vfs_readdir(DIR* pdir)
{
    const vfs_entry_t* vfs = get_vfs_for_index(pdir->dd_vfs_idx);
    struct _reent* r = __getreent();
    if (vfs == NULL) {
       __errno_r(r) = EBADF;
        return NULL;
    }
    struct dirent* ret;
    CHECK_AND_CALLP(ret, r, vfs, readdir, pdir);
    return ret;
}

[dobairoland]

Calls to readdir() are redirected to esp_vfs_readdir() which will redirect the call to readdir implementation of the driver. It decides which driver to use, i.e. fatfs if the directory is in fatfs.

You can find more information about this topic on this site: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/storage/vfs.html

[dobairoland]

The callback for littlefs is registered here: https://github.com/joltwallet/esp_littlefs/blob/master/src/esp_littlefs.c#L255

[ifoxbr]

Thank you Dobairoland

I get this breakpoint when debugging (Esp-IDF/ VsCode), and when running without debug the program crashes, I Iassume it's the same callback. I´m using Littlefs and instantiate as

     esp_vfs_littlefs_conf_t conf = 
    {
        .base_path = "/littlefs",
        .partition_label = "littlefs", // este nome é o Name do arquivo "partition.csv"
        .format_if_mount_failed = true,
        .dont_mount = false,
    };

Regards