generic_file_llseek_size(9)

💅 generic_file_llseek_size(9)

okay so bestie, this one is a Kernel API Manual page, and it's literally the glow-up of generic_file_llseek — same energy, but with extra customization. Let's get into it ✨

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🌸 SYNOPSIS 🌸

loff_t generic_file_llseek_size (struct file *file , loff_t offset , int
whence , loff_t maxsize , loff_t eof );

That's the whole vibe — one function, five arguments, zero drama. 🎀

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🫶 ARGUMENTS 🫶

• file — the file structure you're seeking on. the main character of this whole operation 💅
• offset — the file offset you wanna seek to. where we're headed, bestie 📍
• whence — the type of seek. like, which direction are we going, honestly 🧭
• maxsize — the max size of this file in the file system. the ceiling. the limit. the boundary 🚧
• eof — the offset used for the SEEK_END position. yes, it's a custom one, that's the whole point ✨

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👑 DESCRIPTION 👑

So here's the tea 🍓 — this is a variant of generic_file_llseek that lets you pass in a custom max file size and a custom EOF position. like for e.g. hashed directories. it's giving "I made it customizable because I care" 🎀

Now, the synchronization section, and ngl this part is important so pay attention 😭

• SEEK_SET and SEEK_END are unsynchronized — but atomic on 64bit platforms 💀
• SEEK_CUR is synchronized against other SEEK_CURs, but not against read/writes ⭐
• read/writes behave like SEEK_SET against seeks 🔥

okay bestie, note that "unsynchronized" is literally right there in the text — so don't come for me when I say it out loud. the 64bit atomicity is the one little safety net, periodt 🫶

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🌈 SEE ALSO 🌈

• Kernel file ./fs/read_write.c 💜
• vfs_setpos_cookie(9)
• vfs_setpos(9)
• must_set_pos(9)
• generic_llseek_cookie(9)
• generic_file_llseek(9)
• fixed_size_llseek(9)
• no_seek_end_llseek(9)
• no_seek_end_llseek_size(9)
• noop_llseek(9)

like a whole friend group of llseek functions, and they all ate 🔥

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so that's the page, bestie 💖 it lives in ./fs, the date on it is October 2026, and it's the Kernel API Manual version of generic_file_llseek_size(9) — iconic, no cap 👑✨