shmem_file_setup(9)

👑 shmem_file_setup — ok bestie, let's get you an unlinked file that lives in tmpfs 💅

So this is a Kernel API Manual page, bestie, and it's all about shmem_file_setup — literally the function that gets you an unlinked file living in tmpfs. No cap. ✨

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🌸 NAME 🌸

shmem_file_setup — get an unlinked file living in tmpfs 🫶

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🦋 SYNOPSIS 🦋

Here's the vibe check, character for character:

struct file * shmem_file_setup (const char *name , loff_t size ,
       vma_flags_t flags );

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🎀 ARGUMENTS 🎀

Okay so these are the three things you gotta hand over, and each one has main character energy:

• name — this is the name for the dentry, and yes it's lowkey famous because it's the thing you'll see chilling in /proc/<pid>/maps 👀
• size — the size you want set for the file. That's it, that's the whole job 📏
• flags — the flag zone 💀 and specifically: VMA_NORESERVE_BIT suppresses pre-accounting of the entire object size. Fr fr, that's what it does.

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🔥 SEE ALSO 🔥

Go off, read the related lore, iykyk:

Kernel file ./mm/shmem.c and honestly the whole friend group: shmem_recalc_inode(9), shmem_writeout(9), shmem_get_folio(9), shmem_kernel_file_setup(9), shmem_file_setup_with_mnt(9), shmem_zero_setup(9), shmem_zero_setup_desc(9), shmem_read_folio_gfp(9) ⭐

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And that's the page, bestie 💖 this absolute icon comes to you from ./mm and it's dated October 2026 — periodt, go slay your tmpfs setup 🌈🎀