kiocb_start_write(9)

💖 kiocb_start_write(9) — bestie's guide to grabbing write access on a superblock 💖

okay so this one lives in the Kernel API Manual, and honestly? it's a little baddie with a very specific job. let's get into it ✨

---

🌸 NAME 🌸

kiocb_start_write — get write access to a superblock for async file io 🦋

---

✨ SYNOPSIS ✨

void kiocb_start_write (struct kiocb *iocb );

that's it. that's the whole vibe. one arg, void return, she's clean 💅

---

🎀 ARGUMENTS 🎀

• iocb — the io context we want to submit the write with 🫶 this is the little guy you're handing over so the write knows where it's coming from.

---

👑 DESCRIPTION 👑

so like, real talk: this is a variant of sb_start_write made specifically for async io submission. same energy, different entrance ✨

the one thing you literally cannot skip: it should be matched with a call to kiocb_end_write. that's the pair. start it, end it. no cap, if you start it and never end it you're gonna have a bad time 😭 it's giving unmatched brackets, it's giving unfinished business.

---

🔥 SEE ALSO 🔥

the friend group 🫶 — all of these live in the kernel file ./include/linux/fs.h:

• enum positive_aop_returns(9)
• struct address_space(9)
• struct file_ra_state(9)
• struct file(9)
• i_uid_into_vfsuid(9)
• i_uid_needs_update(9)
• i_uid_update(9)
• i_gid_into_vfsgid(9)
• i_gid_needs_update(9)
• i_gid_update(9)
• inode_fsuid_set(9)
• inode_fsgid_set(9)
• fsuidgid_has_mapping(9)
• inode_set_ctime(9)
• file_write_started(9)
• file_write_not_started(9)
• struct renamedata(9)
• is_mgtime(9)
• iput_if_not_last(9)
• is_idmapped_mnt(9)
• file_start_write(9)
• file_end_write(9)
• kiocb_end_write(9)
• name_is_dot_dotdot(9)
• name_contains_dotdot(9)
• inode_dio_begin(9)
• inode_dio_end(9)
• generic_ci_validate_strict_name(9)

like, go read kiocb_end_write(9) first fr fr, she's the other half of this duo 🌈

---

mwah 💋 that's the page!! this one shipped out of ./include/linux and it's dated October 2026 — go off, calendar icon 🗓️✨ ty for reading bestie, you're gonna slay those async writes 🎀💜