noop_llseek(9)

💅 NAME 💅

okay so bestie, we're in the Kernel API Manual and the main character of this page is noop_llseek(9) — literally the No Operation Performed llseek implementation. periodt. ✨

🌸 SYNOPSIS 🌸

loff_t noop_llseek (struct file *file , loff_t offset , int whence );

that's the exact signature, no cap — keep it character for character. 🫶

🎀 ARGUMENTS 🎀

• file — file structure to seek on. 🫶
• offset — file offset to seek to. 📍
• whence — type of seek. 🔎

✨ DESCRIPTION ✨

So here's the vibe check: this is an implementation of ->llseek that's useable for the rare special case when userspace expects the seek to succeed but the (device) file is actually not able to perform the seek. 😭 In this case you use noop_llseek instead of falling back to the default implementation of ->llseek. That's the whole plot, bestie. 💖

🦋 SEE ALSO 🦋

• Kernel file ./fs/read_write.c — lowkey obsessed with these: vfs_setpos_cookie(9), vfs_setpos(9), must_set_pos(9), generic_file_llseek_size(9), generic_llseek_cookie(9), generic_file_llseek(9), fixed_size_llseek(9), no_seek_end_llseek(9), no_seek_end_llseek_size(9). 💜

Mwah 💋 this page is from ./fs, October 2026, and it's serving noop_llseek(9) realness. 🎀