splice_file_range(9)

💖 splice_file_range(9) — your Kernel API Manual bestie 💖

✨ NAME ✨

<pink>splice_file_range</pink> — splices data between two files for copy_file_range() 💫

🎀 SYNOPSIS 🎀

       ssize_t splice_file_range (struct file *in , loff_t *ppos , struct file
       *out , loff_t *opos , size_t len );

🦋 ARGUMENTS 🦋

okay so the cast of characters is giving very much:

• in — file to splice from 🌸
• ppos — input file offset
• out — file to splice to 💖
• opos — output file offset
• len — number of bytes to splice ✨

💅 DESCRIPTION 💅

This one is for use by ->copy_file_range methods, periodt.

It’s like do_splice_direct, but with a plot twist: vfs_copy_file_range already holds start_file_write on the out file 👑

Also important, bestie: callers already called rw_verify_area on the entire range. No cap. 🫶

🌈 SEE ALSO 🌈

Kernel file ./fs/splice.c is where the magic lives, and the whole friend group is:

• splice_to_pipe(9)
• copy_splice_read(9)
• splice_from_pipe_feed(9)
• splice_from_pipe_next(9)
• splice_from_pipe_begin(9)
• splice_from_pipe_end(9)
• __splice_from_pipe(9)
• splice_from_pipe(9)
• iter_file_splice_write(9)
• splice_to_socket(9)
• vfs_splice_read(9)
• splice_direct_to_actor(9)
• do_splice_direct(9)

huge kisses from the source at ./fs, dated October 2026 — this is splice_file_range(9), and yes she ate 💅🫶🎀