nfsd_stats_io_read_add(9)

✨ nfsd_stats_io_read_add(9) ✨

okay so bestie, you're reading a page straight out of the Kernel API Manual 🎀 and it's about nfsd_stats_io_read_add — yes the whole name, we're not abbreviating, she's iconic and she knows it 💅

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💖 NAME 💖

nfsd_stats_io_read_add — literally just counts the number of bytes for an NFS READ 🍓

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🦋 SYNOPSIS 🦋

void nfsd_stats_io_read_add (struct nfsd_net *nn , struct svc_export
*exp , s64 amount );

that's the whole signature, no notes, she ate ✨

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🌸 ARGUMENTS 🌸

• nn — the target network namespace 🫶 like, which netns are we doing this for
• exp — the target export, the one getting read from 💜
• amount — the byte count, the actual number of bytes we're adding up, no cap

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🔥 DESCRIPTION 🔥

so these counters get updated on every single READ request — every one, bestie, no skipping 🙈

the readers use percpu_counter_sum_positive, and that is the main character detail here: because of it, local batching does not affect read accuracy 👑 so you can batch on the local side all you want and the numbers still come out right. slay.

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🌈 SEE ALSO 🌈

go look at the kernel file ./fs/nfsd/stats.h 💀 and also these besties right here:

• nfsd_stats_rc_hits_inc(9)
• nfsd_stats_rc_misses_inc(9)
• nfsd_stats_rc_nocache_inc(9)
• nfsd_stats_io_write_add(9)
• nfsd_stats_drc_mem_usage_add(9)
• nfsd_stats_drc_mem_usage_sub(9)

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ngl this one's short but she's still doing important work 💅

that's the whole page, mwah 💋 — sourced from ./fs/nfsd, dated October 2026, and remember: nfsd_stats_io_read_add(9) is the moment, iykyk 🌟