STRUCT USB_OS_DESC_EXT_PROP(9)

✨ NAME ✨

struct usb_os_desc_ext_prop — describes one "Extended Property" 💅 ok so this is from the Kernel API Manual, section 9, and it's literally the little struct that holds a single Extended Property. Bestie, it's giving very specific, very important, very niche. Obsessed.

🦋 SYNOPSIS 🦋

struct usb_os_desc_ext_prop {
    struct list_head        entry;
    u8 type;
    int name_len;
    char *name;
    int data_len;
    char *data;
    struct config_item      item;
 };

That's the whole vibe right there — seven members, no cap, nothing extra. 🎀

🌸 MEMBERS 🌸

Ok so let's go through them one by one, because every single one matters and I refuse to skip a single field:

• entry — this is what keeps a list of extended properties. Like, it's the little link that holds the whole friend group together. 🫶
• type — the Extended Property type. It's a u8, so it's a lil guy, but it's the one that says what kind of property this is. Main character energy fr fr. 👑
• name_len — the Extended Property unicode name length, including the terminating ' '. Yes, that's what it says, don't come for me — the length includes that terminating character. 😭
• name — the Extended Property name. The actual name. The government name, if you will. 🌸
• data_len — the Length of the Extended Property blob (for unicode store double len). Read that twice, it's important — for unicode, store double len. 🔥
• data — the Extended Property blob itself. The payload. The substance. The content. ✨
• item — Represents this Extended Property in configfs. So it's how this whole thing shows up in configfs, slay. 💜

🔥 SEE ALSO 🔥

Kernel file ./include/linux/usb/composite.h, plus the whole squad:

• struct usb_os_desc(9)
• struct usb_os_desc_table(9)
• struct usb_function(9)
• struct usb_configuration(9)
• struct usb_composite_driver(9)
• module_usb_composite_driver(9)
• struct usb_composite_dev(9)

Go read them, iykyk. 🌈

Okay that's the whole page, bestie — every member, every reference, nothing dropped. 🧚

Sign-off time: this lil beauty lives under ./include/linux/usb, and it's dated October 2026 ⭐ — so like, future-dated and still iconic. struct usb_os_desc_ext_prop(9) out. 💖 🎀 🦋