nfsd41_cb_referring_call(9)

💖 nfsd41_cb_referring_call(9) — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're deep in the kernel, NFSv4.1 callback land, and someone needs a referring call attached to a callback op. that's this function. welcome to the group chat, it's the Kernel API Manual and we're all gonna understand it together 💅

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✨ SYNOPSIS ✨

void nfsd41_cb_referring_call (struct nfsd4_callback *cb ,
                               struct nfs4_sessionid *sessionid ,
                               u32 slotid ,
                               u32 seqno );

that's it. that's the whole vibe. four args, returns void, no drama 🌸

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🫶 ARGUMENTS 🫶

• cb — the context of the callback you're adding the rc to. like, this is the callback, the main character 👑
• sessionid — the referring call's session ID. yep, the session's very own ID 🦋
• slotid — the referring call's session slot index. which slot, bestie? this one 🔥
• seqno — the referring call's slot sequence number. the seqno of that slot, fr fr ⭐

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💜 DESCRIPTION 💜

so here's what's tea: the caller serializes access to cb. that's on you, not on this function. you handle the locking, it just does the add. periodt 🙈

NB: if memory allocation fails, the referring call is NOT added. 😭 like literally it just doesn't happen. no rc for you. check your allocation situation, bestie, this is important 💀

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🌈 SEE ALSO 🌈

the lore continues over here, go read these:

• Kernel file ./fs/nfsd/nfs4callback.c — the source herself 💖
• nfsd41_cb_destroy_referring_call_list(9) — the cleanup arc 🧹
• nfsd4_run_cb(9) — the running arc 🏃‍♀️
• nfsd_net_cb_shutdown(9) — the shutting-down arc 🔻
• nfsd_net_cb_init(9) — the starting-fresh arc 🌱

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kisses from ./fs/nfsd — this page was served fresh in October 2026 and the whole thing is filed under nfsd41_cb_referring_call(9). slay, go forth and add those referring calls 🎀✨🦋