inode_cgwb_enabled(9)

💖 inode_cgwb_enabled(9) — Kernel API Manual 💖

okay bestie, welcome to the Kernel API Manual page for inode_cgwb_enabled(9) — it’s giving “tiny bool, big cgroup writeback energy” ✨

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🌸 NAME 🌸

inode_cgwb_enabled — test whether cgroup writeback is enabled on an inode 💅

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🎀 SYNOPSIS 🎀

bool inode_cgwb_enabled (struct inode *inode );

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🦋 ARGUMENTS 🦋

• inode — the inode of interest 👀

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💜 DESCRIPTION 💜

Cgroup writeback requires support from the filesystem. Also, both memcg and iocg have to be on the default hierarchy. This function tests whether all of those conditions are met — literal vibe check for cgroup writeback 👑

Heads up, bestie: the test result may change dynamically on the same inode depending on how memcg and iocg are configured. So yeah, the same inode can absolutely switch up its answer 😭

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🌈 SEE ALSO 🌈

• Kernel file ./include/linux/backing-dev.h
• writeback_in_progress(9)
• wb_find_current(9)
• wb_get_create_current(9)
• inode_to_wb(9)
• unlocked_inode_to_wb_begin(9)
• unlocked_inode_to_wb_end(9)

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cute sign-off: this page came from the ./include/linux source, October 2026, and it is the inode_cgwb_enabled(9) manual page. mwah 💋🫶