netfs_wb_begin(9)

💅 netfs_wb_begin — like, the Kernel API Manual page, bestie 🎀

Okay so real talk, this one's called netfs_wb_begin and it's literally about beginning writeback — and yeah, it waits if it has to. Iconic behavior, no notes. 🦋

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✨ SYNOPSIS ✨

bool netfs_wb_begin (struct netfs_inode *ictx , bool nowait );

Like, it takes two things and gives you back a bool. That's the whole vibe. 🫶

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🌸 ARGUMENTS 🌸

• ictx — the inode you're trying to get writeback access on. That's your main character right there. 👑
• nowait — if this is true, you get a failure back immediately instead of waiting around like a loser. Zero patience. Respect. 💅

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💖 DESCRIPTION 💖

So here's what's happening: you're beginning writeback to an inode, and if nowait is false, you're gonna wait for exclusive access. Like, you just sit there. Patiently. Until it's your turn. ✨

Why tho? Because this is what prevents collection from being done out of order with respect to the issuance of write subrequests. And yes, that sentence is a mouthful, but it matters — the ordering is the whole point, bestie. 🧚

Also, heads up, this is kinda important: writeback may be ended in a different process than started it — for example, the collection function on a workqueue. So don't go assuming start and end happen in the same place, because they fr fr might not. 😭

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🔥 RETURN 🔥

• True — you can proceed, slay, go off. ✅
• False — denied. Not you. Better luck next time. 💀

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🌈 SEE ALSO 🌈

Kernel file ./fs/netfs/locking.c and honestly the whole friend group:

• netfs_start_io_read(9)
• netfs_end_io_read(9)
• netfs_start_io_write(9)
• netfs_end_io_write(9)
• netfs_start_io_direct(9)
• netfs_end_io_direct(9)

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Okay that's the whole page, you ate that 🍓 — with love from ./fs/netfs, October 2026, mwah 💜