wbc_attach_and_unlock_inode(9)

💅 wbc_attach_and_unlock_inode(9) — Kernel API Manual

okay bestie, welcome to the wbc_attach_and_unlock_inode(9) page ✨ this is a section 9 kernel API joint, so pull up a chair, grab a strawberry 🍓, and let's get into it.

---

🌸 NAME 🌸

wbc_attach_and_unlock_inode — the function that associates a wbc with a target inode and then unlocks it, like the world's most responsible situationship 🫶

---

🎀 SYNOPSIS 🎀

void wbc_attach_and_unlock_inode (struct writeback_control *wbc , struct inode *inode );

that's the whole signature, no cap — returns void, so don't go looking for a return value, she gives you nothing back 😭

---

🦋 ARGUMENTS 🦋

• wbc — the writeback_control of interest 💖 this is the vibe check target, the struct we're about to write into.
• inode — the target inode 👑 the main character of this whole operation.

---

✨ DESCRIPTION ✨

so here's the tea ☕ — inode is locked and is about to be written back under the control of wbc. simple so far, right?

what this function does is: record inode's writeback context into wbc, and then unlock the i_lock. that's it. that's the whole job. iconic behaviour, honestly 💅

heads up bestie: on writeback completion, wbc_detach_inode should be called. don't leave her hanging — she needs her counterpart 😤

and what's all this in service of? tracking the cgroup writeback context 🌈 that's the actual point of this whole dance.

---

🔥 SEE ALSO 🔥

first off, the kernel file this lives in: ./fs/fs-writeback.c — put some respect on it 🧚

and here's the full squad, every single one of them, no gatekeeping:

• inode_io_list_move_locked(9)
• wb_wait_for_completion(9)
• inode_cgwb_move_to_attached(9)
• locked_inode_to_wb_and_lock_list(9)
• inode_to_wb_and_lock_list(9)
• inode_switch_wbs(9)
• cleanup_offline_cgwb(9)
• wbc_attach_fdatawrite_inode(9)
• wbc_detach_inode(9)
• wbc_account_cgroup_owner(9)
• wb_split_bdi_pages(9)
• bdi_split_work_to_wbs(9)
• cgroup_writeback_by_id(9)
• cgroup_writeback_umount(9)
• wb_start_background_writeback(9)
• filemap_dontcache_kick_writeback(9)
• __mark_inode_dirty(9)
• writeback_inodes_sb_nr(9)
• writeback_inodes_sb(9)
• try_to_writeback_inodes_sb(9)
• sync_inodes_sb(9)
• write_inode_now(9)
• sync_inode_metadata(9)

like, that is a stacked SEE ALSO section. ate and left no crumbs 🍽️

---

anyway that's the whole page, bestie, hope it slayed for you 💜 this lil number lives in ./fs and the version stamp is dated October 2026, so like… she's from the future, periodt ⭐ bye! 🎀