netfs_file_write_iter(9)

✨ netfs_file_write_iter(9) ✨

hey bestie, welcome to the Kernel API Manual entry for netfs_file_write_iter(9) — we're writing data to a file and we're gonna understand it, periodt 💅

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🎀 NAME 🎀

netfs_file_write_iter — write data to a file 💖

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🦋 SYNOPSIS 🦋

ssize_t netfs_file_write_iter (struct kiocb *iocb , struct iov_iter
       *from );

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🌸 ARGUMENTS 🌸

• iocb — the IO state structure, aka the vibe check for this IO operation ✨
• from — an iov_iter carrying the data to write 🫶

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🔥 DESCRIPTION 🔥

okay so this one performs a write to a file. If it can, it writes into the pagecache; if it can't, it does an unbuffered write instead. that's the whole plot, no cap 😭

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💅 RETURN 💅

• A negative error code if no data has been written at all, or vfs_fsync_range failed for a synchronous write 😭
• The number of bytes written, even for truncated writes — yes, even then, bestie 💀

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🌈 SEE ALSO 🌈

Kernel file ./fs/netfs/buffered_write.c: netfs_perform_write(9), netfs_buffered_write_iter_locked(9) 💖

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mwah 💋 this icon lives under ./fs/netfs, dated October 2026, and it's the netfs_file_write_iter(9) page from the Kernel API Manual. byeee 🫶