binderfs_bi...evice_create(9)

💅 binderfs_bi...evice_create(9) 💅

okay so bestie, welcome to the Kernel API Manual — yes the actual manual name, we're fancy now — and today's main character is a little function called binderfs_binder_device_create. sit down, grab a strawberry 🍓, let's go.

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✨ NAME ✨

binderfs_binder_device_create — allocate an inode from the super block of a binderfs mount 🎀

like, that's literally her job. that's the whole vibe.

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🌸 SYNOPSIS 🌸

int binderfs_binder_device_create (struct inode *ref_inode , struct
binderfs_device __user *userp , struct binderfs_device *req );

three args, one int coming back at you. no cap. ✨

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🦋 ARGUMENTS 🦋

• ref_inode — the inode you're yoinking the super block from. she's the reference point, the blueprint, the source of truth 💖
• userp — the buffer where the info about the new device gets copied so userspace can actually see it. it's giving "shipping the deets back home" 🫶
• req — a struct binderfs_device that's already been copied out of userspace. lowkey already yours, just sitting there 🙈

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👑 DESCRIPTION 👑

okay so here's what actually happens, bestie, pay attention 🔥

This function allocates a new binder_device and reserves a new minor number for it. and here's the tea: minor numbers are limited and tracked globally in binderfs_minors. so like, don't go wild, there's a finite supply 😭

Then the function will stash a struct binder_device for the specific binder device in i_private of the inode. iconic behavior honestly.

and it doesn't stop there — she will go on to allocate a new inode from the super block of the filesystem mount, stash a struct binder_device in its i_private field, and attach a dentry to that inode. full glow-up, three steps, ate and left no crumbs 💅✨

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🌈 RETURN 🌈

• 0 on success 🎉 slay
• negative errno on failure 💀 sad but informative

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/android/binderfs.c
• binder_ctl_ioctl(9)
• binderfs_binder_ctl_create(9)

iykyk 💜

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that's the whole page bestie, go forth and allocate 🦋

source location: ./drivers/android · dated October 2026 · Kernel API Manual — mwah, bye! 💖🎀⭐