inode_dax(9)

💅 inode_dax — Kernel API Manual (section 9)

okay so welcome to inode_dax(9), bestie — a whole Kernel API Manual page, section 9, dedicated to one (1) little function. she's small, she's specific, she's iconic. let's get into it 🫶

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✨ NAME ✨

inode_dax — convert a public inode into its dax_dev

like, that's the whole job. in → out. an inode walks in, a dax_dev walks out. slay 💅

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🦋 SYNOPSIS 🦋

struct dax_device * inode_dax (struct inode *inode );

yes that's the signature, copy-pasted exactly, no I will not be reformatting it, she is perfect as she is 😌

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🎀 ARGUMENTS 🎀

• inode — an inode with i_cdev pointing to a dax_dev 👑 that's the vibe check. if your inode's i_cdev isn't pointing at a dax_dev, this function is not for you, bestie.

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🌸 DESCRIPTION 🌸

okay so here's the tea: this converts a public inode into its dax_dev, periodt.

but — and this is the important part, don't skip it 🙈 — this is not equivalent to to_dax_dev. to_dax_dev is for private internal use, the kind of situation where we already know the inode filesystem type == dax_fs_type. so like, they are not the same thing, not interchangeable, don't @ me, the manpage literally says so 😭

lowkey the whole point of this paragraph is the warning: public inode → inode_dax. private/internal + known dax_fs_type → to_dax_dev. keep them straight, iykyk 💀

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/dax/super.c — struct dax_device(9)
• fs_dax_get_by_bdev(9)
• fs_put_dax(9)
• fs_dax_get(9)
• dax_direct_access(9)
• dax_set_ops(9)
• dax_holder(9)

the whole dax friend group, honestly 🧚 go read them, they're all connected, it's giving lore 💜

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that's the page!! no cap, that's genuinely everything ✨

source ./drivers/dax, dated October 2026, and yeah — it's inode_dax(9), still the main character of this entire manpage 💖 bye bestie, go convert some inodes 🎀