open_ubi(9)

✨ open_ubi 💅

okay so this is the Kernel API Manual entry for open_ubi, and bestie it is literally the function that parses a UBI device name string and opens the UBI device. It’s giving “kernel plumbing but make it cute”, and we are keeping every single detail. 🫶

🎀 NAME 🎀

open_ubi — parse UBI device name string and open the UBI device.

🌸 SYNOPSIS 🌸

struct ubi_volume_desc * open_ubi (struct fs_context *fc , int mode );

🦋 ARGUMENTS 🦋

• fc — the filesystem context. That’s the context vibe, okay? 💫
• mode — the UBI volume open mode. Slay, that’s the mode. 🔥

✨ DESCRIPTION ✨

The primary method of mounting UBIFS is by specifying the UBI volume character device node path. But bestie, UBIFS may also be mounted without any character device node — using one of these methods, no cap:

• ubiX_Y — mount UBI device number X, volume Y
• ubiY — mount UBI device number 0, volume Y
• ubiX:NAME — mount UBI device X, volume with name NAME
• ubi:NAME — mount UBI device 0, volume with name NAME

An alternative ! separator may be used instead of : — and yes, this matters because some shells like busybox may interpret : as an NFS host name separator 😭. This function returns a UBI volume description object in case of success, and a negative error code in case of failure. Periodt.

👑 SEE ALSO 👑

Kernel file ./fs/ubifs/super.c and all these cross-refs — not me skipping a single one, iykyk:

• validate_inode(9)
• init_constants_early(9)
• bud_wbuf_callback(9)
• take_gc_lnum(9)
• alloc_wbufs(9)
• free_wbufs(9)
• free_orphans(9)
• free_buds(9)
• check_volume_empty(9)
• ubifs_parse_param(9)
• destroy_journal(9)
• bu_init(9)
• check_free_space(9)
• mount_ubifs(9)
• ubifs_umount(9)
• ubifs_remount_rw(9)
• ubifs_remount_ro(9)

xoxo, your Unix bestie 💖 — source/version ./fs/ubifs, dated October 2026 🌈