nfs_coalesce_size(9)

💅 nfs_coalesce_size(9) 💅

ok so this is a kernel API manual page, bestie — it lives in the Kernel API Manual section and honestly it's giving "small function, big responsibilities" energy. Let's get into it ✨

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🌸 NAME 🌸

nfs_coalesce_size — the vibe check that tells you whether two requests are compatible enough to smoosh together 🫶

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✨ SYNOPSIS ✨

unsigned int nfs_coalesce_size (struct nfs_page *prev , struct nfs_page
*req , struct nfs_pageio_descriptor *pgio );

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🎀 ARGUMENTS 🎀

• prev — pointer to nfs_page (the one that came first, the og request 💅)
• req — pointer to nfs_page (the new one trying to get in on the action)
• pgio — pointer to nfs_pagio_descriptor (yes that's how it's spelled here, don't come for me, I'm just the messenger 😭)

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🦋 DESCRIPTION 🦋

okay so real talk: the nfs_page structures prev and req get compared. what are we comparing, you ask? we're making sure that:

• the page data area they describe is contiguous — like, actually next to each other, no gaps, no awkwardness 👑
• their RPC credentials are the same
• their NFSv4 open state is the same
• their lockowners are the same

if all of that lines up? slay. they're compatible.

Returns the size of the request that can be coalesced. periodt. 💖

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🌈 SEE ALSO 🌈

kernel file ./fs/nfs/pagelist.c — that's where the magic lives, iykyk 🧚

and the whole friend group, fr fr:

• nfs_iocounter_wait(9)
• nfs_async_iocounter_wait(9)
• nfs_page_group_sync_on_bit_locked(9)
• nfs_page_create_from_page(9)
• nfs_page_create_from_folio(9)
• nfs_unlock_request(9)
• nfs_unlock_and_release_request(9)
• nfs_free_request(9)
• nfs_pgio_data_destroy(9)
• nfs_pgio_rpcsetup(9)
• nfs_pgio_prepare(9)
• nfs_pgio_error(9)
• nfs_pgio_release(9)
• nfs_pageio_init(9)
• nfs_pgio_result(9)
• nfs_pageio_do_add_request(9)
• __nfs_pageio_add_request(9)
• nfs_pageio_complete(9)
• nfs_pageio_cond_complete(9)

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ngl, "coalesce" is such a main character word. it's giving "come together, become one, ate" 🔥

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ok that's the page!! sourced straight from ./fs/nfs, dated October 2026, and it's the nfs_coalesce_size(9) manual page signing off — stay contiguous, stay credential-consistent, and don't let anyone tell you your lockowner is different 💜🎀✨