dax_finish_sync_fault(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dax_finish_sync_fault(9) 💅

okay so bestie, welcome to the Kernel API Manual — yes, the actual kernel API manual, we're doing this, we're built different today ✨

🌸 NAME 🌸

dax_finish_sync_fault — the function that finishes a synchronous page fault. yeah. that's the whole vibe. it wraps things up, it closes the loop, it's the "okay bestie we're done here" of page faults 🎀

🦋 SYNOPSIS 🦋

vm_fault_t dax_finish_sync_fault (struct vm_fault *vmf , unsigned int
       order , unsigned long pfn );

like, look at her. three args, returns a vm_fault_t. iconic behavior only 👑

💖 ARGUMENTS 💖

  • vmf — the description of the fault, aka the whole story of what just went down. it's a struct vm_fault * and it knows things 🫶
  • order — order of the entry that's about to be inserted. it's an unsigned int, it's in charge, respect it 💅
  • pfn — the PFN to insert. page frame number. the main character of this particular operation, no cap ⭐

🔥 DESCRIPTION 🔥

okay so here's the tea ☕ — this function does two very important things and honestly it ate:

  1. it ensures that the file range touched by the page fault is stored persistently on the media — like, actually written down, actually durable, actually surviving a reboot, fr fr 💾
  2. it handles inserting of the appropriate page table entry — so the page table gets the right entry and everything lines up correctly, slay 🧚

that's it. that's the function. persistent storage + correct page table entry = the whole job. simple, effective, lowkey perfect 🌈

👀 SEE ALSO 👀

so if you wanna go down the rabbit hole (and you should, iykyk), check out the kernel file ./fs/dax.c and these absolute legends:

all of them, no skipping, they're a package deal 💜

warning bestie: this is kernel DAX code — the persistence part is the whole point, so don't go thinking you can vibe your way around it 😭

and that's the page! brought to you by the ./fs crew, dated October 2026, in the one and only Kernel API Manual — see you in the group chat, mwah 💋💖

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